Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising from the force caused by magnets, objects that produce fields that attract or repel other objects. The magnetic phenomenon is known since its inception. The ancient Greeks knew about the magnetic force.
Thales of Miletus is considered to have been the first man to study magnetic forces. According to Lucretius, a Roman philosopher in the first century BC, the term magnet was derived from the province of Magnesia.
A particle accelerator is a device that uses electromagnetic fields to accelerate charged particles to high speeds and contain them in well-defined beams. They can be used for purposes like radiotherapy, ion implantation, and industrial and biomedical research. The largest particle accelerators in the world are the RHIC, the LHC at CERN, and the Tevatron, which are used for experimental particle physics research. Particle accelerators can be divided into low-energy machines like cathode ray tubes and X-ray generators, and high-energy machines capable of nuclear reactions like the LHC, which smashes particles together at high speeds to study the origins of the universe.
introduction to electrodynamics contains:
chapter 1: vectors
vector analysis
vector operations
vector transform
Divergence theorem
stock theorem
chapter 2 :electrostatics
Coulomb law
Electric field
Gauss law
Maxwell equations (1,2)
Potential energy
work done
Chapter3: Dipole
Electric field due to dipole
Potential energy due to dipole
Polarization
electric dipole moment
electric displacement
Rutherford scattering & the scattering cross-sectionBisma Princezz
1) Rutherford performed an experiment where he bombarded a thin gold foil with alpha particles and observed that most passed through without deflection, some were deflected by small angles, and a few were deflected back.
2) This led Rutherford to propose an atomic model where the atom has a small, dense nucleus containing its mass and positive charge, surrounded by electrons in orbits.
3) This was a major departure from the previous "plum pudding" model where charge and mass were thought to be uniformly distributed. However, Rutherford's model failed to explain the stability of electron orbits.
Synthesis & characterization of magnesium ferrites & exploring its microwave ...Nikita Gupta
Magnesium ferrite was synthesized using a co-precipitation method with magnesium nitrate and iron nitrate precursors. The synthesized powder was characterized using XRD, FESEM, and VSM. XRD analysis showed the sample had a hexagonal structure with crystallite size of approximately 80-300nm. FESEM images showed uniformly distributed grains of 100-300nm in size with some porosity. VSM analysis showed the sample was ferromagnetic with increasing magnetization as annealing temperature increased, reaching 20.8 emu/g when annealed at 950 degrees Celsius. Microwave absorption measurements from 8-12GHz showed return losses up to 0.874dB, indicating the sample could potentially be used for microwave absorption applications
Maxwell equations and propagation in anisotropic mediaSolo Hermelin
Describes the propagation of electromagnetic waves in anisotropic electrical media.
Please send comments to solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com.
The presentation is not properly downloaded. Please go to my website and open it in the Optics Folder.
Neutrinos are neutral leptons that interact via the weak force. They exhibit quantum phenomena such as wave-particle duality and oscillations between flavor states. Neutrinos have small but non-zero mass, and the mass eigenstates do not correspond directly to the flavor eigenstates. This leads to neutrino oscillations, where the probability of detecting a neutrino as a particular flavor changes over time and distance as the mass eigenstates propagate. While much is known, questions remain about the absolute neutrino masses and whether neutrinos are their own antiparticles.
1) The document outlines key concepts from Einstein's theory of special relativity including reference frames, the Michelson-Morley experiment, postulates of relativity, Lorentz transformations, length contraction and time dilation.
2) It discusses experimental evidence for concepts like time dilation from observations of muon decay lifetimes and provides equations for length contraction, time dilation, velocity addition and relativistic mass.
3) The twin paradox is introduced as a thought experiment exploring time dilation between twins where one takes a high speed journey into space and back while the other remains on Earth. Accelerations are identified as the resolution for why the traveling twin ages less.
The James Webb Space Telescope (JWST) is a large infrared telescope with a 6.5 meter primary mirror. It is an international collaboration between NASA, ESA, and CSA scheduled to launch in 2021. The JWST will be located in solar orbit approximately 1 million miles from Earth. It has a sunshield the size of a tennis court to shield its infrared instruments from the Sun, Earth, and Moon's heat. The JWST's goal is to study every phase of cosmic history, including the first galaxies formed after the Big Bang.
A particle accelerator is a device that uses electromagnetic fields to accelerate charged particles to high speeds and contain them in well-defined beams. They can be used for purposes like radiotherapy, ion implantation, and industrial and biomedical research. The largest particle accelerators in the world are the RHIC, the LHC at CERN, and the Tevatron, which are used for experimental particle physics research. Particle accelerators can be divided into low-energy machines like cathode ray tubes and X-ray generators, and high-energy machines capable of nuclear reactions like the LHC, which smashes particles together at high speeds to study the origins of the universe.
introduction to electrodynamics contains:
chapter 1: vectors
vector analysis
vector operations
vector transform
Divergence theorem
stock theorem
chapter 2 :electrostatics
Coulomb law
Electric field
Gauss law
Maxwell equations (1,2)
Potential energy
work done
Chapter3: Dipole
Electric field due to dipole
Potential energy due to dipole
Polarization
electric dipole moment
electric displacement
Rutherford scattering & the scattering cross-sectionBisma Princezz
1) Rutherford performed an experiment where he bombarded a thin gold foil with alpha particles and observed that most passed through without deflection, some were deflected by small angles, and a few were deflected back.
2) This led Rutherford to propose an atomic model where the atom has a small, dense nucleus containing its mass and positive charge, surrounded by electrons in orbits.
3) This was a major departure from the previous "plum pudding" model where charge and mass were thought to be uniformly distributed. However, Rutherford's model failed to explain the stability of electron orbits.
Synthesis & characterization of magnesium ferrites & exploring its microwave ...Nikita Gupta
Magnesium ferrite was synthesized using a co-precipitation method with magnesium nitrate and iron nitrate precursors. The synthesized powder was characterized using XRD, FESEM, and VSM. XRD analysis showed the sample had a hexagonal structure with crystallite size of approximately 80-300nm. FESEM images showed uniformly distributed grains of 100-300nm in size with some porosity. VSM analysis showed the sample was ferromagnetic with increasing magnetization as annealing temperature increased, reaching 20.8 emu/g when annealed at 950 degrees Celsius. Microwave absorption measurements from 8-12GHz showed return losses up to 0.874dB, indicating the sample could potentially be used for microwave absorption applications
Maxwell equations and propagation in anisotropic mediaSolo Hermelin
Describes the propagation of electromagnetic waves in anisotropic electrical media.
Please send comments to solo.hermelin@gmail.com.
For more presentations on different subjects visit my website at http://www.solohermelin.com.
The presentation is not properly downloaded. Please go to my website and open it in the Optics Folder.
Neutrinos are neutral leptons that interact via the weak force. They exhibit quantum phenomena such as wave-particle duality and oscillations between flavor states. Neutrinos have small but non-zero mass, and the mass eigenstates do not correspond directly to the flavor eigenstates. This leads to neutrino oscillations, where the probability of detecting a neutrino as a particular flavor changes over time and distance as the mass eigenstates propagate. While much is known, questions remain about the absolute neutrino masses and whether neutrinos are their own antiparticles.
1) The document outlines key concepts from Einstein's theory of special relativity including reference frames, the Michelson-Morley experiment, postulates of relativity, Lorentz transformations, length contraction and time dilation.
2) It discusses experimental evidence for concepts like time dilation from observations of muon decay lifetimes and provides equations for length contraction, time dilation, velocity addition and relativistic mass.
3) The twin paradox is introduced as a thought experiment exploring time dilation between twins where one takes a high speed journey into space and back while the other remains on Earth. Accelerations are identified as the resolution for why the traveling twin ages less.
The James Webb Space Telescope (JWST) is a large infrared telescope with a 6.5 meter primary mirror. It is an international collaboration between NASA, ESA, and CSA scheduled to launch in 2021. The JWST will be located in solar orbit approximately 1 million miles from Earth. It has a sunshield the size of a tennis court to shield its infrared instruments from the Sun, Earth, and Moon's heat. The JWST's goal is to study every phase of cosmic history, including the first galaxies formed after the Big Bang.
This document discusses metamaterials and their applications in superlensing and cloaking. It begins by explaining Victor Veselago's proposal in the 1960s that a material with negative permeability and permittivity could bend light backwards. In the 2000s, Pendry and Smith created metamaterials with engineered electromagnetic responses at subwavelength scales that demonstrated negative refraction. This led to the development of the superlens, which can overcome the diffraction limit and image objects smaller than the wavelength of light used. The document also discusses how transformation optics allows for the design of cloaking materials that bend light around objects, rendering them invisible.
This document provides an introduction to giant magnetoresistance (GMR), including its discovery in the late 1980s and commercial applications in hard disk drives. GMR is observed in thin film structures with alternating ferromagnetic and nonmagnetic layers, where resistance decreases significantly (typically 10-80%) in the presence of a magnetic field. The effect is explained using a model where resistance is lower when magnetic moments of ferromagnetic layers are parallel versus antiparallel. The document describes different types of structures that exhibit GMR, including magnetic multilayers, spin valves, pseudo-spin valves, and granular thin films.
This document defines electro-optic effects and describes how an external electric field can induce changes in the refractive index of a material, modulating its optical properties. It discusses the Pockels effect specifically, where a linear change in refractive index occurs due to an applied electric field. This effect can be used to build integrated optical modulators and switches, such as a transverse Pockels cell that inserts a phase difference between orthogonal field components, acting as a polarization modulator. The phase difference can be converted to an intensity variation using an interferometer such as a Mach-Zehnder configuration.
The document summarizes the history and development of lasers from theoretical foundations laid by Planck and Einstein in the early 20th century through key innovations and applications from the 1950s onward. It describes important early work developing maser technology by Townes, Basov, Prokhorov and others in the 1950s, the first working laser built by Maiman in 1960, and expanding applications of lasers in spectroscopy, medicine, manufacturing, communications, and other fields over subsequent decades.
The document discusses the classical scattering cross section in mechanics. It begins by introducing scattering cross sections as important parameters in physics. It then discusses central forces and how scattering of particles can be considered under classical central force approximations. The rest of the document derives the classical Rutherford differential scattering cross section formula by analyzing particle scattering via a central force and equating impact parameters with scattering angles and energies. It notes how this classical formula fits real scattering problems well but departs at higher energies, requiring quantum mechanical treatment.
The document discusses magnetic properties and different types of magnetic materials. It defines key terms like magnetic field strength, induction, permeability, susceptibility, and saturation magnetization. It describes the origins of magnetic moments from orbital and spin motions. It classifies materials as diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic, or ferrimagnetic based on their relative magnetic permeabilities and behaviors in an external magnetic field. It explains the temperature dependence of magnetization and how thermal vibrations reduce the saturation magnetization above critical temperatures like the Curie or Neel points.
1) Rutherford performed an experiment where he bombarded a thin gold foil with alpha particles and observed that most passed through without deflection, some were deflected by small angles, and a few were deflected back.
2) This led Rutherford to propose an atomic model where the atom has a small, dense nucleus containing its mass and positive charge, surrounded by electrons in orbits.
3) This was a major departure from the previous "plum pudding" model with a uniform distribution of charge. However, Rutherford's model failed to explain electron stability and other issues.
A betatron is a device that accelerates electrons using an expanding magnetic field within a doughnut-shaped vacuum chamber. Electrons are injected into the chamber and accelerated as the magnetic field strength increases over time. This increasing magnetic flux induces an electric field that increases the electrons' energy, allowing them to gain extremely high speeds. The betatron condition requires that the rate of change of magnetic flux through the circular orbit equals 2π times the radius squared times the rate of change of the magnetic field, in order to maintain the electrons' constant orbital radius as they accelerate.
The document discusses Mott physics and the metal-insulator transition. It introduces concepts such as Fermi liquids in metals, Mott insulators arising from electron-electron interactions, and the competition between kinetic energy and interaction energy leading to a Mott transition from metal to insulator with increasing interaction strength. It also distinguishes between Slater insulators driven by antiferromagnetism and Mott insulators where insulating behavior does not require magnetic ordering.
This document summarizes the magnetic properties of different types of magnetic materials based on an experiment measuring their magnetic susceptibility. The four main types discussed are diamagnetic, paramagnetic, ferromagnetic, and antiferromagnetic. The experiment measures the magnetization of ZnO, ZnO doped with manganese, and nickel powder samples using a vibrator sample magnetometer. Based on the magnetic susceptibility calculations and curve shapes, ZnO is found to be diamagnetic, ZnO doped with manganese is paramagnetic, and nickel is ferromagnetic.
Electrical transport and magnetic interactions in 3d and 5d transition metal ...ABDERRAHMANE REGGAD
The document discusses electrical transport and magnetic interactions in 3d and 5d transition metal oxides. It summarizes that for decades, transition metal oxides have been explored where exotic states like high-Tc superconductivity and colossal magnetoresistance emerge due to cooperative interactions between spin, charge, and orbital degrees of freedom. The document then examines various phenomena in transition metal oxides including Mott insulators, double exchange mechanism, and the Kitaev-Heisenberg model observed in iridate compounds like Na2IrO3 which may realize a spin liquid ground state.
Neutron reflectometry can be used to study oxide interfaces. It provides a non-destructive technique to determine the structure and magnetism of surfaces and buried interfaces with angstrom-level resolution. Examples of systems studied include ferromagnet-superconductor heterostructures where competing interactions at the interface can be observed, and cuprate-manganite interfaces where charge transfer and magnetic reconstruction occur within a few nanometers of the boundary. Neutron reflectometry is a powerful "interface toolbox" for understanding complex oxide materials.
This document provides an overview of topics related to nuclear power generation basics and scientific literacy. It includes several episodes that cover various concepts in atomic and nuclear physics, such as quantum physics, lasers, wave-particle duality, radioactivity, nuclear stability, nuclear fission, and particle physics. Each episode contains links to activities and outlines the main aims and prior knowledge needed. The goal is to help students learn about these topics in a coherent manner through lessons and activities at various levels.
This document discusses nonlinear optics and summarizes key topics covered:
- It describes the difference between linear and nonlinear optics, where linear optics involves weak light that is unchanged and nonlinear optics involves intense light that can induce effects and be manipulated.
- Nonlinear optics allows changing light properties like color and shape, and has applications in telecommunications and creating ultrashort events.
- Phenomena like sum and difference frequency generation are examples of second-order nonlinear optical effects. Phase matching is important for efficient nonlinear optical processes.
- Applications of nonlinear optics include optical phase conjugation, optical parametric oscillators, optical computing, optical switching, and optical data storage.
Rutherford performed experiments scattering alpha particles off a thin gold foil that could not be explained by Thomson's atomic model. Rutherford's results showed that a small percentage of particles were scattered at very large angles, which could only be explained if atoms had small, dense nuclei. This led to Rutherford's model of the atom, with electrons in circular orbits around a tiny, positively charged nucleus containing almost all the mass of the atom. The Rutherford model successfully explained the stability of atoms through the balance of electric and centrifugal forces on orbiting electrons.
This document is a project report submitted by Priyanka Verma and Smriti Singh for their Bachelor of Science degree in physics. It discusses elementary particles, including their characteristics, classification, conservation laws, and examples like electrons, positrons, protons, neutrons, pions, and kaons. The report includes certificates of completion from their college principal and physics professors.
The nuclear shell model was developed in 1949 and describes how protons and neutrons occupy discrete energy levels, or shells, within the nucleus, analogous to the way electrons occupy shells in atoms. It explains several nuclear properties that the liquid drop model could not, such as magic numbers and spin. Nuclei with magic numbers of protons or neutrons are particularly stable due to their filled shells. Evidence for the shell structure includes increased stability and separation energies at magic numbers, and the stable isotopes at the end of radioactive decay chains all having magic numbers of protons. The model makes assumptions like an average central force field and independent nucleon motion within orbits. However, it has limitations like not explaining schmidt lines or higher energy nuclear states fully
Ferromagnetism arises from the parallel alignment of atomic magnetic moments due to strong exchange interactions between electrons. Ferromagnetic materials can exhibit spontaneous magnetization and magnetic ordering temperatures. The exchange force is a quantum mechanical phenomenon that favors parallel spin alignment of electrons and results in large internal molecular fields that align atomic moments. Ferrimagnetism is a similar phenomenon where sublattices have unequal and opposing magnetic moments, resulting in a net magnetic moment. Common ferrimagnetic materials include ferrites with spinel and hexagonal structures.
The Large Hadron Collider (LHC) is the world's largest and most powerful particle collider located at CERN near Geneva, Switzerland. Built between 1998 and 2008 by over 10,000 scientists and engineers from over 100 countries, the LHC lies in a 27-kilometer tunnel up to 175 meters underground. Physicists use the LHC to study the collisions of beams of hadrons (protons and heavy ions) circulating at nearly the speed of light to investigate fundamental questions in physics, such as the Higgs mechanism, supersymmetry, extra dimensions, and dark matter. The LHC led to the 2012 discovery of the Higgs boson and continues making new discoveries through high-energy collisions analyzed using detectors like AT
This document discusses band theory and its application to understanding the properties of materials. It begins by introducing classical and quantum free electron theories, which treat electrons in solids as free particles. The behavior of electrons in periodic potentials is then described, leading to the development of band theory. Band theory explains that the discrete energy levels of isolated atoms merge into continuous energy bands as atoms form solids. This allows classification of materials as conductors, semiconductors, or insulators based on whether their energy bands are fully filled, partially filled, or fully empty. Band formation in silicon is provided as an example. The document concludes that band theory determines a material's ability to conduct electricity based on its energy band structure.
Fundamental elements of-electrical-engineering circuit theory basic stardeltaSouvik Dutta
The document discusses various topics related to magnetism. It defines key terms like magnetic pole, magnetic axis, and pole strength. It describes different types of magnets such as natural magnets, permanent magnets, and electromagnets. Permanent magnets retain their magnetic properties indefinitely, while electromagnets only exhibit magnetism when electric current is passed through them. Electromagnets are widely used in applications like electric generators, motors, cranes and medical devices due to their adjustable magnetic field strength. Soft iron can be magnetized temporarily using an electromagnet, while steel retains magnetism and is used to make permanent bar magnets.
This document discusses metamaterials and their applications in superlensing and cloaking. It begins by explaining Victor Veselago's proposal in the 1960s that a material with negative permeability and permittivity could bend light backwards. In the 2000s, Pendry and Smith created metamaterials with engineered electromagnetic responses at subwavelength scales that demonstrated negative refraction. This led to the development of the superlens, which can overcome the diffraction limit and image objects smaller than the wavelength of light used. The document also discusses how transformation optics allows for the design of cloaking materials that bend light around objects, rendering them invisible.
This document provides an introduction to giant magnetoresistance (GMR), including its discovery in the late 1980s and commercial applications in hard disk drives. GMR is observed in thin film structures with alternating ferromagnetic and nonmagnetic layers, where resistance decreases significantly (typically 10-80%) in the presence of a magnetic field. The effect is explained using a model where resistance is lower when magnetic moments of ferromagnetic layers are parallel versus antiparallel. The document describes different types of structures that exhibit GMR, including magnetic multilayers, spin valves, pseudo-spin valves, and granular thin films.
This document defines electro-optic effects and describes how an external electric field can induce changes in the refractive index of a material, modulating its optical properties. It discusses the Pockels effect specifically, where a linear change in refractive index occurs due to an applied electric field. This effect can be used to build integrated optical modulators and switches, such as a transverse Pockels cell that inserts a phase difference between orthogonal field components, acting as a polarization modulator. The phase difference can be converted to an intensity variation using an interferometer such as a Mach-Zehnder configuration.
The document summarizes the history and development of lasers from theoretical foundations laid by Planck and Einstein in the early 20th century through key innovations and applications from the 1950s onward. It describes important early work developing maser technology by Townes, Basov, Prokhorov and others in the 1950s, the first working laser built by Maiman in 1960, and expanding applications of lasers in spectroscopy, medicine, manufacturing, communications, and other fields over subsequent decades.
The document discusses the classical scattering cross section in mechanics. It begins by introducing scattering cross sections as important parameters in physics. It then discusses central forces and how scattering of particles can be considered under classical central force approximations. The rest of the document derives the classical Rutherford differential scattering cross section formula by analyzing particle scattering via a central force and equating impact parameters with scattering angles and energies. It notes how this classical formula fits real scattering problems well but departs at higher energies, requiring quantum mechanical treatment.
The document discusses magnetic properties and different types of magnetic materials. It defines key terms like magnetic field strength, induction, permeability, susceptibility, and saturation magnetization. It describes the origins of magnetic moments from orbital and spin motions. It classifies materials as diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic, or ferrimagnetic based on their relative magnetic permeabilities and behaviors in an external magnetic field. It explains the temperature dependence of magnetization and how thermal vibrations reduce the saturation magnetization above critical temperatures like the Curie or Neel points.
1) Rutherford performed an experiment where he bombarded a thin gold foil with alpha particles and observed that most passed through without deflection, some were deflected by small angles, and a few were deflected back.
2) This led Rutherford to propose an atomic model where the atom has a small, dense nucleus containing its mass and positive charge, surrounded by electrons in orbits.
3) This was a major departure from the previous "plum pudding" model with a uniform distribution of charge. However, Rutherford's model failed to explain electron stability and other issues.
A betatron is a device that accelerates electrons using an expanding magnetic field within a doughnut-shaped vacuum chamber. Electrons are injected into the chamber and accelerated as the magnetic field strength increases over time. This increasing magnetic flux induces an electric field that increases the electrons' energy, allowing them to gain extremely high speeds. The betatron condition requires that the rate of change of magnetic flux through the circular orbit equals 2π times the radius squared times the rate of change of the magnetic field, in order to maintain the electrons' constant orbital radius as they accelerate.
The document discusses Mott physics and the metal-insulator transition. It introduces concepts such as Fermi liquids in metals, Mott insulators arising from electron-electron interactions, and the competition between kinetic energy and interaction energy leading to a Mott transition from metal to insulator with increasing interaction strength. It also distinguishes between Slater insulators driven by antiferromagnetism and Mott insulators where insulating behavior does not require magnetic ordering.
This document summarizes the magnetic properties of different types of magnetic materials based on an experiment measuring their magnetic susceptibility. The four main types discussed are diamagnetic, paramagnetic, ferromagnetic, and antiferromagnetic. The experiment measures the magnetization of ZnO, ZnO doped with manganese, and nickel powder samples using a vibrator sample magnetometer. Based on the magnetic susceptibility calculations and curve shapes, ZnO is found to be diamagnetic, ZnO doped with manganese is paramagnetic, and nickel is ferromagnetic.
Electrical transport and magnetic interactions in 3d and 5d transition metal ...ABDERRAHMANE REGGAD
The document discusses electrical transport and magnetic interactions in 3d and 5d transition metal oxides. It summarizes that for decades, transition metal oxides have been explored where exotic states like high-Tc superconductivity and colossal magnetoresistance emerge due to cooperative interactions between spin, charge, and orbital degrees of freedom. The document then examines various phenomena in transition metal oxides including Mott insulators, double exchange mechanism, and the Kitaev-Heisenberg model observed in iridate compounds like Na2IrO3 which may realize a spin liquid ground state.
Neutron reflectometry can be used to study oxide interfaces. It provides a non-destructive technique to determine the structure and magnetism of surfaces and buried interfaces with angstrom-level resolution. Examples of systems studied include ferromagnet-superconductor heterostructures where competing interactions at the interface can be observed, and cuprate-manganite interfaces where charge transfer and magnetic reconstruction occur within a few nanometers of the boundary. Neutron reflectometry is a powerful "interface toolbox" for understanding complex oxide materials.
This document provides an overview of topics related to nuclear power generation basics and scientific literacy. It includes several episodes that cover various concepts in atomic and nuclear physics, such as quantum physics, lasers, wave-particle duality, radioactivity, nuclear stability, nuclear fission, and particle physics. Each episode contains links to activities and outlines the main aims and prior knowledge needed. The goal is to help students learn about these topics in a coherent manner through lessons and activities at various levels.
This document discusses nonlinear optics and summarizes key topics covered:
- It describes the difference between linear and nonlinear optics, where linear optics involves weak light that is unchanged and nonlinear optics involves intense light that can induce effects and be manipulated.
- Nonlinear optics allows changing light properties like color and shape, and has applications in telecommunications and creating ultrashort events.
- Phenomena like sum and difference frequency generation are examples of second-order nonlinear optical effects. Phase matching is important for efficient nonlinear optical processes.
- Applications of nonlinear optics include optical phase conjugation, optical parametric oscillators, optical computing, optical switching, and optical data storage.
Rutherford performed experiments scattering alpha particles off a thin gold foil that could not be explained by Thomson's atomic model. Rutherford's results showed that a small percentage of particles were scattered at very large angles, which could only be explained if atoms had small, dense nuclei. This led to Rutherford's model of the atom, with electrons in circular orbits around a tiny, positively charged nucleus containing almost all the mass of the atom. The Rutherford model successfully explained the stability of atoms through the balance of electric and centrifugal forces on orbiting electrons.
This document is a project report submitted by Priyanka Verma and Smriti Singh for their Bachelor of Science degree in physics. It discusses elementary particles, including their characteristics, classification, conservation laws, and examples like electrons, positrons, protons, neutrons, pions, and kaons. The report includes certificates of completion from their college principal and physics professors.
The nuclear shell model was developed in 1949 and describes how protons and neutrons occupy discrete energy levels, or shells, within the nucleus, analogous to the way electrons occupy shells in atoms. It explains several nuclear properties that the liquid drop model could not, such as magic numbers and spin. Nuclei with magic numbers of protons or neutrons are particularly stable due to their filled shells. Evidence for the shell structure includes increased stability and separation energies at magic numbers, and the stable isotopes at the end of radioactive decay chains all having magic numbers of protons. The model makes assumptions like an average central force field and independent nucleon motion within orbits. However, it has limitations like not explaining schmidt lines or higher energy nuclear states fully
Ferromagnetism arises from the parallel alignment of atomic magnetic moments due to strong exchange interactions between electrons. Ferromagnetic materials can exhibit spontaneous magnetization and magnetic ordering temperatures. The exchange force is a quantum mechanical phenomenon that favors parallel spin alignment of electrons and results in large internal molecular fields that align atomic moments. Ferrimagnetism is a similar phenomenon where sublattices have unequal and opposing magnetic moments, resulting in a net magnetic moment. Common ferrimagnetic materials include ferrites with spinel and hexagonal structures.
The Large Hadron Collider (LHC) is the world's largest and most powerful particle collider located at CERN near Geneva, Switzerland. Built between 1998 and 2008 by over 10,000 scientists and engineers from over 100 countries, the LHC lies in a 27-kilometer tunnel up to 175 meters underground. Physicists use the LHC to study the collisions of beams of hadrons (protons and heavy ions) circulating at nearly the speed of light to investigate fundamental questions in physics, such as the Higgs mechanism, supersymmetry, extra dimensions, and dark matter. The LHC led to the 2012 discovery of the Higgs boson and continues making new discoveries through high-energy collisions analyzed using detectors like AT
This document discusses band theory and its application to understanding the properties of materials. It begins by introducing classical and quantum free electron theories, which treat electrons in solids as free particles. The behavior of electrons in periodic potentials is then described, leading to the development of band theory. Band theory explains that the discrete energy levels of isolated atoms merge into continuous energy bands as atoms form solids. This allows classification of materials as conductors, semiconductors, or insulators based on whether their energy bands are fully filled, partially filled, or fully empty. Band formation in silicon is provided as an example. The document concludes that band theory determines a material's ability to conduct electricity based on its energy band structure.
Fundamental elements of-electrical-engineering circuit theory basic stardeltaSouvik Dutta
The document discusses various topics related to magnetism. It defines key terms like magnetic pole, magnetic axis, and pole strength. It describes different types of magnets such as natural magnets, permanent magnets, and electromagnets. Permanent magnets retain their magnetic properties indefinitely, while electromagnets only exhibit magnetism when electric current is passed through them. Electromagnets are widely used in applications like electric generators, motors, cranes and medical devices due to their adjustable magnetic field strength. Soft iron can be magnetized temporarily using an electromagnet, while steel retains magnetism and is used to make permanent bar magnets.
This document discusses magnetic materials and their properties. It begins by defining magnetic materials as those that can be attracted or repelled by an external magnetic field and can become magnetized. Examples given are iron and its alloys. The document then discusses several key magnetic properties including magnetic moment, magnetic field/intensity, magnetization vector, magnetic susceptibility, hysteresis, Curie temperature, and different types of magnetism such as diamagnetism, paramagnetism, ferromagnetism, antiferromagnetism, and ferrimagnetism. Finally, it provides examples of applications of magnetic properties including electric motors/generators, data storage, magnetic bearings, separators, medical uses, security, and braking systems.
This document provides an overview of power plant operations and fundamentals. It begins with basic electricity concepts like electron theory and magnetism. It then covers power plant basics such as energy conversion, steam turbines, combustion systems, and the boiler water and steam cycle. The document also discusses plant instrumentation and control theory, introductory equipment topics, plant drawings, key plant systems, turbines, internal combustion engines, boilers, power generation, electrical systems, steam tables, and water chemistry/treatment. The overall aim is to introduce fundamental concepts for understanding power plant operations.
a branch of nano electronics that will improve technology by adding new freedom degrees to electronic for transfer and store information better than electronic devices :)
DEPENDENCE OF HIGH TEMPERATURE ON STRENGTH OF MAGNETGaurav Sharma
The document is a student's certificate, acknowledgements, index, and report on a school science project investigating the dependence of magnetic strength on high temperature. The project involved heating a magnet in an oven and measuring the weight of paperclips attracted at different temperatures. The results showed that magnetic strength initially increased as temperature decreased but then decreased at very low temperatures, as extreme temperatures can destabilize the balance between temperature and magnetic domains in magnetic materials.
The document discusses wireless mobile phone charging through microwave power transmission and rectification. It describes the key components of the transmitter and receiver sections. The transmitter section consists of a magnetron to generate microwaves and a slotted waveguide antenna to transmit them. The receiver section uses a rectenna (rectifying antenna) made of a mesh of dipoles and diodes to convert received microwaves into DC electricity. It also includes a simple sensor circuit to detect when a call is taking place so that the phone can charge during a call. The overall system aims to wirelessly charge a mobile phone using microwave power transmitted to a rectenna attached to the phone.
David jiles (auth.) introduction to magnetism and magnetic materials-springer...khalil ur rehman marwat
This document provides an introduction and overview of the textbook "Introduction to Magnetism and Magnetic Materials" by David Jiles. It discusses how the textbook covers the fundamentals of magnetism from the macroscopic to microscopic scale. It also explains how the textbook progresses from basic magnetic phenomena and fields to applications of magnetism. The preface provides context for why the textbook was written and the approach it takes in explaining magnetism.
Magnetism and electromagnetism are properties that allow certain materials to interact with magnetic fields. Magnetism arises from the spin of electrons within atoms. Electromagnetism is the study of the interaction between electric charges and magnetic fields. Magnets can attract or repel other magnetic materials and have distinct north and south poles. Various scientists like Oersted, Gilbert, Ampere, and Faraday contributed important discoveries about electromagnetism through experiments. Lenz's law and Faraday's law describe key principles of electromagnetic induction. Transformers, generators, motors, and other devices utilize the principles of electromagnetism.
SOME BASIC PRINCIPLES OF MAGNETISM (Autosaved).docxZocelynManingo1
Electric Current and Magnetism
The Nature of Magnetism: Electricity’s Silent Partner
Magnetism is a property of a material that enables to attract or repel other materials. The presence and strength of the material’s magnetic properties can be observed by the effect of the forces of attraction and repulsion on other materials.
What makes magnets?
Magnets are actually created by tiny spinning electrons in an atom. The electrons move about the nucleus and spin like a top, creating a tiny magnetic field.
If electrons are spinning in the same direction there is more magnetism, while electrons spinning in opposite directions cancel out each others’ magnetic fields. Magnetic fields are invisible, we can only see the effects of the magnetic force.
Magnetic Field: The space around a magnet in which a magnetic force is exerted
— The shape of a magnetic field is revealed by magnetic field lines
Directed away from north poles and toward south poles
Magnets have two ends or poles, called north and south poles. At the poles of a magnet, the magnetic field lines are closer together.
The magnetic field lines around horse-shoe and disk magnets are closest together at the magnets’ poles. Unlike poles of magnets attract each other and like poles of magnets repel. Magnetic Poles: A region on a magnet which produces magnetic forces
The poles of a suspended magnet will align themselves to the poles of the Earth
Fundamental Rule: Like poles repel; opposite poles attract
If a force of attraction only is possible between an object and a magnet, then the object interacting with the magnet contains a ferromagnetic substance and is considered naturally magnetic.
If a force of repulsion is only between an object and a magnet, then the object interacting with the magnet may also be a permanent magnet or a temporarily magnetized ferromagnetic material.
Materials which are attracted by a magnet are known as magnetic materials. Iron, cobalt, nickel and many alloys of these metals like steel and alnico are magnetic.
Magnetic materials can be used to make permanent or temporary magnets unlike the non-magnetic materials which cannot.
INDUCED MAGNETISM
The process by which the screws become magnets is called Electric/Magnetic Induction. This same process is the reason why magnets attract non-magnetized magnetic substances such as the screw. The screw becomes an induced magnet with the end nearer the magnet having an opposite polarity to that of the permanent magnet. Hence attraction happens after magnetic induction occurs. The quicker way to know the polarity of a permanent or induced magnet is by the use of a magnetic compass. Compass needle is a small magnet that is free to pivot in a horizontal plane about an axis and that the end of the magnet that points to geographic north is called the north (N) pole. Likewise, the opposite end of the magnet is the south (S) pole.What are magnetic domains?
Magnetic substances like iron, cobalt and nickel
Superconductors have no electrical resistance below a certain temperature, allowing electric currents to flow without resistance. Particle accelerators use superconductors in their electromagnetic fields to steer and focus particle beams efficiently without resistance causing heat buildup. Superconducting magnets are crucial for particle accelerators as they generate strong electromagnetic fields without resistance, allowing accelerators to operate more effectively and advance our understanding of the universe through high-energy particle research.
This document is a seminar report submitted by Sreenath M to fulfill requirements for a BSc in Electronics from the University of Kerala between 2011-2014. The report focuses on spin valve transistors and was conducted at the College of Applied Science in Adoor, Kerala. It includes an introduction to spintronics and spin valve transistors, as well as sections on the history and physics of giant magnetoresistance and the spin valve effect. The report discusses the working principle, current transfer characteristics, and resistance measurement techniques for spin valve transistors. It was reviewed and approved by the internal and external examiners listed.
Superconducting magnets on Material ScienceSneheshDutta
Superconducting Magnets application and properties. ppt on Superconducting Magnets. I’ve done a bit of research recently into superconducting magnets and this time the research was jointly funded by the NASA Human Exploration Research Applications Project (HERP) and NASA’s Office of Space Science. This research was initiated at MIT’s Laboratory for Materials and Energy Sciences and involved the use of NASA’s Centaur upper stage for sounding rockets.
F. Magnetron Deconstruction and Antenna AdaptationKurt Zeller
1) The document discusses deconstructing magnetrons from microwave ovens to use their resonant cavities and tap wires as antennas for experimentation.
2) Connecting the tap wire to an SMA connector was difficult due to material incompatibilities between the copper cavity and stainless steel panel mount.
3) Simulating the magnetron output in EM Pro software proved too complex, so plane wave simulations were used instead. Reducing the magnetron's 900-1000W output power was also explored through circuit designs.
In our conventional electronic devices we use semi conducting materials for logical operation and magnetic materials for storage, but spintronics uses magnetic materials for both purposes. These spintronic devices are more versatile and faster than the present one. One such device is Spin Valve Transistors (SVT).
Spin valve transistor is different from conventional transistor. In this for conduction we use spin polarization of electrons. Only electrons with correct spin polarization can travel successfully through the device. These transistors are used in data storage, signal processing, automation and robotics with less power consumption and results in less heat. This also finds its application in Quantum computing, in which we use Qubits instead of bits.
Electrical and magnetic physical phenomena and effects used.pptxFuadAliew1
Electrical and magnetic phenomena are related and have many practical applications. Electricity is produced by the movement of charged particles like electrons and protons, which can create attractive or repulsive forces. Magnetism is a physical phenomenon mediated by magnetic fields, which are created by electric currents or the magnetic moments of elementary particles. Electromagnetic induction occurs when a changing magnetic field generates an electric field, or vice versa, as discovered by Michael Faraday. This principle allows the generation of electric currents from magnetic fields without batteries, and is the basis for technologies like transformers, motors, and generators.
This document is a 38-page seminar report on spectroscopy submitted by two students, Arpit Modh and Parth Kasodariya. It includes an introduction to spectroscopy, descriptions of various spectroscopy techniques like atomic absorption spectroscopy, infrared absorption spectroscopy, and ultraviolet-visible spectroscopy. The report covers principles, instrumentation, applications, and more for different spectroscopy methods. It aims to provide a basic review of spectroscopy and its uses in various important fields like structure analysis.
The document discusses superconductors and their potential impacts on society. It describes how superconductors could revolutionize electronics and energy systems by allowing electricity to flow with no resistance. Superconductors have the potential to advance fields like medicine, transportation, and energy. For example, superconductors are already used in MRI machines and could enable new transportation technologies like maglev trains. However, more research is needed to discover superconductors that work at higher temperatures, like room temperature, which could vastly improve their applications. The document argues that governments and private organizations should increase funding for superconductor research that could solve energy and sustainability issues.
The document discusses how to build a simple electromagnet using copper wire wrapped around an iron nail, connected to a battery. When electric current flows through the wire, it creates a magnetic field that allows the nail to attract iron filings. The strength of an electromagnet depends on factors like the number of wire turns and amount of electric current. Electromagnets are found in many devices and have various applications because they can be switched on and off using electricity unlike permanent magnets.
The document provides an overview of an educational unit on electricity and magnetism. It discusses key topics that will be covered, including different types of electricity (static and electric currents), direct and alternating currents, the relationship between electricity and magnetism, and how they are integral to modern technology. It also describes a "spark" activity that can be used to introduce these topics by demonstrating static electricity and sparking student curiosity.
Kraft Heinz experienced major accounting issues after its merger, including reporting incorrect data from departments, improperly recognizing accounting items, and improper expense management. This led to overstated financial statements and misleading investors. To address these issues, Kraft Heinz implemented internal controls, automated expense management processes, and ensured compliance with GAAP to accurately report financial information.
Knowledge needed for RNs in healthcare technology.
Healthcare technology has been increasingly integrated in nursing practice to promote efficiency, reduce errors, and enhance patient care
Knowledge is the acquaintance of principles or facts and familiarity with a particular branch of learning. Nurses need to familiarize with technology to have a meaningful use
Training or preparation with basic computer skills provides knowledge
Computer literacy and competency is now essential for nurses
Knowledge is crucial to adoption of IT system in nursing to improve efficiency of care
THE PROBLEM OF CHINA’S AGING POPULATIONPeachy Essay
China’s life expectancy rates have increased substantially from 44 years to 76 years over the past years. Even so, the United Nations project the country’s aging population will increase to nearly 870 million by 2050 (Wei, 2021). China’s 7th election showed that the country has the world’s largest elderly population with 455 million people aged 60 years and above and account for 32.2 % of the total population as of 2020 (Does China have an aging problem? 2020). An increasingly older population risks a country's economic productivity, which ultimately impacts global foreign exchange trading processes long-term due to the rising dependency ratio
Illegal immigration is one of the most common criminal offences recorded in the United Kingdom. There is no correct definition of an illegal migrant or irregular migrant in UK law, but there are many ways an individual becomes an irregular migrant. If one enters the UK regularly but breaches the conditions that granted their entry, such as work or is convicted, they are considered illegal migrants. An individual who enters the UK through deception and those who don't leave the country after missing asylum is irregular migrants. The UK doesn't have birthright citizenship, and if one is born of irregular migrants, they are considered to be illegal migrants too. Many people without regular migration status in the UK arrived by air and through ordinary means. Illegal immigration is a serious problem since millions of illegal migrants are already in the UK.
This document provides a summary and analysis of the anthology The (M)other Tongue: Essays in Feminist Psychoanalytic Interpretation. It discusses how psychoanalytic feminist criticism has grown in prominence and brought together unlikely pairs such as feminism and psychoanalysis as well as post-structuralism and American feminist social science. It analyzes how the anthology focuses on the figure of the mother and progresses from discussing father-based Oedipal structures to mother-based pre-Oedipal models. However, it also notes how the conclusion of the anthology's introduction glosses over differences between feminist critical approaches in favor of an inclusive joining, reflecting a tendency for the mother figure to discourage differentiation.
The cranial nerves are a set of twelve peripheral nerves that originate from the brain (Vilensky, Robertson & Quian, 2015).
The nerves are labelled I to XII in the order they originate from the brain.
The optic nerve is the second nerve.
It originates from the cerebrum and conducts sensory information from the eyes to the brain.
The Impact of Covid-19-Induced Remote Consultations on Nurse-Patient Relation...Peachy Essay
This document outlines a proposed qualitative study on the impact of COVID-19-induced remote consultations on nurse-patient relationships in primary care. The study aims to investigate how increased use of e-consultations during the pandemic has affected nurse-patient relationships. Semi-structured interviews will be conducted with primary care nurses to explore how relationships are built and how they affect care quality. Thematic analysis of interview transcripts will be used to analyze the data and identify ways to optimize relationships during virtual consultations. The findings could help nurses improve patient education through digital means.
Negligence Risks Liabilities In Clean Public Business FacilityPeachy Essay
This presentation seeks to propose possible and appropriate actions in regards to business environment.
Background
Clean-n-shine is cleaning company headquartered in a commercial space in local shopping center
The enterprise is open to the public and will be conducting transaction such as selling cleaning products, completing contracts for cleaning services, and meeting existing and new clients
The shopping centre is public space with heavy traffic of customers
The need to preserve the environment is the responsibility of every individual, government or corporation.
Various problem such as global warming have affected every aspect of human life such a health, agriculture and entertainment.
RNN ARCHITECTURES: LSTM and GRU WITH TENSORFLOW BACKENDPeachy Essay
The document discusses RNN architectures including LSTM and GRU models using TensorFlow. It provides details on how LSTM uses memory mechanisms like forget gates, input gates, and output gates to better maintain information over time as compared to regular RNNs. The LSTM model in the code uses 60 time-steps and 1 output for time series data. GRU is also discussed as being similar to LSTM but with fewer parameters and gates, making it more computationally efficient. The GRU model has a reset gate and update gate. Predictions are made using both the LSTM and GRU models.
International Business Cultural Analysis of SingaporePeachy Essay
International Business Cultural Analysis of Singapore
Singapore is a wonderful example of a multi-ethnic state since its population is mixed-up of Chinese 74.3%, Malays 13.3%, and Indians 9.1%. Since the government's efforts to preserve religious pluralism, Singapore has no official or dominant religion.
Singapore follows the Asian model of higher education and research, which is based on Confucian education systems like those found in Japan and Korea.
It has a long history of political stability, and the government aggressively promotes international investment.
It has highly developed free market economy(Commisceo Global, 2017).
A fractional upper class, an upper middle class, an intermediate middle class, a lower middle class, and a working class are the five social classes that may be identified in Singapore's society.
Bethesda Mining is a coal mining company with mining fields across different locations including Ohio, Pennsylvania, West Virginia and Kentucky. The company sells its products either by contract or on spot market. Recently, the company was approached by Mid-Ohio Electric Company for the supply of five hundred tons of coal for a period of four years on a contract basis. Currently, the company does not have enough coals in its mines to take the contract. However, the company has another option that they need to consider and maybe take the contract.
Remote Patient Monitoring System at Mayo ClinicPeachy Essay
The Remote Patient Monitoring (RPM) system at Mayo Clinic allows doctors to monitor patients' health from a distance. It involves collecting biometric data from patients through mobile devices and transmitting it to medical practitioners. Mayo Clinic developed its RPM system to address issues like rising patient admissions, high emergency room visits, and the need to improve access to specialty care. The system is managed by the Center for Connected Care and involves training for medical staff. Strict security and privacy measures protect patient data collected by the RPM system.
The 2020 COVID-19 pandemic has made worse in every imaginable way. People with underlying medical conditions have been considered to be more at risk than others. In this paper,
the risks associated with opioid addiction and how it has affected victims in Canada will be analyzed. Reports show that in British Columbia (BC), a new all-time high has been recorded. In
2020 alone, there were over 4,000 deaths related to opioids (Crabtree et al., 2020). This increase can be traced to the measures undertaken during the pandemic in BC. These measures caused what Papamihali et al. (2020) called a syndemic. This is a situation when multiple public health emergencies come together to make each other worse. The syndemic between the opioids crisis and COVID-19 in BC will be outlined seeking to understand the reason behind the unusually high number of deaths in that region in 2020.
There is a lot of apprehensions associated with inverted yield curves and for good reason. From a macro-economic perspective, an inverted yield curve predicts poor economic
performances shortly. This is the reason why in August 2019 when a yield curve inversion was reported in the United States, the term recession was the most searched on Google in the country (Mendez-Carbajo, 2019). The two concepts are often related because, an inverted yield curve, more often than not, leads to a recession.
This document discusses the Magnet Recognition Program (MRP), which is a designation given by the American Nurses Credentialing Center (ANCC) to healthcare organizations that meet standards of nursing excellence. The MRP promotes transformational leadership, empowered nurses, and the dissemination of best nursing practices. Achieving Magnet Designation requires undergoing a rigorous application and review process. Doing so helps organizations improve nurse retention, satisfaction, and outcomes for patients.
Empirical Indicators: Johnson’s Behavioral System ModelPeachy Essay
The document discusses Johnson's Behavioral System Model (JBSM) which views patients as having seven interactive subsystems that can cause stability or instability. The role of nursing is to create stability through interventions that shape patient behavior. The JBSM can be tested using empirical indicators to measure the concepts. Testable hypotheses are proposed about how each subsystem correlates with health outcomes. A plan is outlined to collect data by applying interventions targeting each subsystem and assessing their impact on symptom severity. The JBSM provides a framework for nursing assessments and targeting specific interventions to improve health outcomes.
Healthy Eating Habits:
Understanding Nutrition Labels: Teaches how to read and interpret food labels, focusing on serving sizes, calorie intake, and nutrients to limit or include.
Tips for Healthy Eating: Offers practical advice such as incorporating a variety of foods, practicing moderation, staying hydrated, and eating mindfully.
Benefits of Regular Exercise:
Physical Benefits: Discusses how exercise aids in weight management, muscle and bone health, cardiovascular health, and flexibility.
Mental Benefits: Explains the psychological advantages, including stress reduction, improved mood, and better sleep.
Tips for Staying Active:
Encourages consistency, variety in exercises, setting realistic goals, and finding enjoyable activities to maintain motivation.
Maintaining a Balanced Lifestyle:
Integrating Nutrition and Exercise: Suggests meal planning and incorporating physical activity into daily routines.
Monitoring Progress: Recommends tracking food intake and exercise, regular health check-ups, and provides tips for achieving balance, such as getting sufficient sleep, managing stress, and staying socially active.
PET CT beginners Guide covers some of the underrepresented topics in PET CTMiadAlsulami
This lecture briefly covers some of the underrepresented topics in Molecular imaging with cases , such as:
- Primary pleural tumors and pleural metastases.
- Distinguishing between MPM and Talc Pleurodesis.
- Urological tumors.
- The role of FDG PET in NET.
International Cancer Survivors Day is celebrated during June, placing the spotlight not only on cancer survivors, but also their caregivers.
CANSA has compiled a list of tips and guidelines of support:
https://cansa.org.za/who-cares-for-cancer-patients-caregivers/
Can coffee help me lose weight? Yes, 25,422 users in the USA use it for that ...nirahealhty
The South Beach Coffee Java Diet is a variation of the popular South Beach Diet, which was developed by cardiologist Dr. Arthur Agatston. The original South Beach Diet focuses on consuming lean proteins, healthy fats, and low-glycemic index carbohydrates. The South Beach Coffee Java Diet adds the element of coffee, specifically caffeine, to enhance weight loss and improve energy levels.
INFECTION OF THE BRAIN -ENCEPHALITIS ( PPT)blessyjannu21
Neurological system includes brain and spinal cord. It plays an important role in functioning of our body. Encephalitis is the inflammation of the brain. Causes include viral infections, infections from insect bites or an autoimmune reaction that affects the brain. It can be life-threatening or cause long-term complications. Treatment varies, but most people require hospitalization so they can receive intensive treatment, including life support.
Stem Cell Solutions: Dr. David Greene's Path to Non-Surgical Cardiac CareDr. David Greene Arizona
Explore the groundbreaking work of Dr. David Greene, a pioneer in regenerative medicine, who is revolutionizing the field of cardiology through stem cell therapy in Arizona. This ppt delves into how Dr. Greene's innovative approach is providing non-surgical, effective treatments for heart disease, using the body's own cells to repair heart damage and improve patient outcomes. Learn about the science behind stem cell therapy, its benefits over traditional cardiac surgeries, and the promising future it holds for modern medicine. Join us as we uncover how Dr. Greene's commitment to stem cell research and therapy is setting new standards in healthcare and offering new hope to cardiac patients.
Feeding plate for a newborn with Cleft Palate.pptxSatvikaPrasad
A feeding plate is a prosthetic device used for newborns with a cleft palate to assist in feeding and improve nutrition intake. From a prosthodontic perspective, this plate acts as a barrier between the oral and nasal cavities, facilitating effective sucking and swallowing by providing a more normal anatomical structure. It helps to prevent milk from entering the nasal passage, thereby reducing the risk of aspiration and enhancing the infant's ability to feed efficiently. The feeding plate also aids in the development of the oral muscles and can contribute to better growth and weight gain. Its custom fabrication and proper fitting by a prosthodontist are crucial for ensuring comfort and functionality, as well as for minimizing potential complications. Early intervention with a feeding plate can significantly improve the quality of life for both the infant and the parents.
Can Allopathy and Homeopathy Be Used Together in India.pdfDharma Homoeopathy
This article explores the potential for combining allopathy and homeopathy in India, examining the benefits, challenges, and the emerging field of integrative medicine.
KEY Points of Leicester travel clinic In London doc.docxNX Healthcare
In order to protect visitors' safety and wellbeing, Travel Clinic Leicester offers a wide range of travel-related health treatments, including individualized counseling and vaccines. Our team of medical experts specializes in getting people ready for international travel, with a particular emphasis on vaccines and health consultations to prevent travel-related illnesses. We provide a range of travel-related services, such as health concerns unique to a trip, prevention of malaria, and travel-related medical supplies. Our clinic is dedicated to providing top-notch care, keeping abreast of the most recent recommendations for vaccinations and travel health precautions. The goal of Travel Clinic Leicester is to keep you safe and well-rested no matter what kind of travel you choose—business, pleasure, or adventure.
TEST BANK FOR Health Assessment in Nursing 7th Edition by Weber Chapters 1 - ...rightmanforbloodline
TEST BANK FOR Health Assessment in Nursing 7th Edition by Weber Chapters 1 - 34.
TEST BANK FOR Health Assessment in Nursing 7th Edition by Weber Chapters 1 - 34.
TEST BANK FOR Health Assessment in Nursing 7th Edition by Weber Chapters 1 - 34.
Under Pressure : Kenneth Kruk's StrategyKenneth Kruk
Kenneth Kruk's story of transforming challenges into opportunities by leading successful medical record transitions and bridging scientific knowledge gaps during COVID-19.
Gemma Wean- Nutritional solution for Artemiasmuskaan0008
GEMMA Wean is a high end larval co-feeding and weaning diet aimed at Artemia optimisation and is fortified with a high level of proteins and phospholipids. GEMMA Wean provides the early weaned juveniles with dedicated fish nutrition and is an ideal follow on from GEMMA Micro or Artemia.
GEMMA Wean has an optimised nutritional balance and physical quality so that it flows more freely and spreads readily on the water surface. The balance of phospholipid classes to- gether with the production technology based on a low temperature extrusion process improve the physical aspect of the pellets while still retaining the high phospholipid content.
GEMMA Wean is available in 0.1mm, 0.2mm and 0.3mm. There is also a 0.5mm micro-pellet, GEMMA Wean Diamond, which covers the early nursery stage from post-weaning to pre-growing.
Michigan HealthTech Market Map 2024. Includes 7 categories: Policy Makers, Academic Innovation Centers, Digital Health Providers, Healthcare Providers, Payers / Insurance, Device Companies, Life Science Companies, Innovation Accelerators. Developed by the Michigan-Israel Business Accelerator
2. 3
EXPERIMENT No. 1
Magnetic Phase Transitions
1.1 Introduction
Magnetism is one aspect of the combined electromagnetic force. It refers to physical phenomena arising
from the force caused by magnets, objects that produce fields that attract or repel other objects. The
magnetic phenomenon is known since its inception. The ancient Greeks knew about the magnetic force.
Thales of Miletus is considered to have been the first man to study magnetic forces. According to
3. 4
Lucretius, a Roman philosopher in the first century BC, the term magnet was derived from the province
of Magnesia.
The Earth itself is a giant magnet. The planet gets its magnetic field from circulating electric currents
within the molten metallic core. A compass points north because the small magnetic needle in it is
suspended so that it can spin freely inside its casing to align itself with the planet's magnetic field.
Beginning from these very early discoveries in magnetism, from the Chinese invention of the magnetic
compass to the pioneering work of scientists such as Oersted, Ampere, Faraday, Maxwell and Neel, we
have come a long way in our understanding of magnetism. Today, a complete understanding of
magnetism requires a deep understanding of the branch of physics, we call quantum physics, we can
also interpret magnetism with the help of classical physics. Nature has given us materials with diverse
magnetic properties. Ranging from the strongly magnetic, iron and cobalt to the weakly magnetic,
rubber and water, there exists a remarkable variety of magnetic materials. The kings of these materials
are the ferromagnetic and ferrimagnets that are used in inductors, transformers, motors and generators,
antennas, audio and video tapes, loudspeakers and microphones and the exotic giant magneto resistance
(GMR) devices. We could say that in electrical engineering, magnetic materials and devices are as
pervasive as oxygen! Without transformers with ferrite cores, for example, it would be almost
impossible to have the vast electric grid and supply systems that have transformed the fate of the post-
industrial man.
Magnetism takes many other forms, but except for ferromagnetism, they are usually too weak to be
observed except by sensitive laboratory instruments. Such as Paramagnetism, is the form magnetism
4. 5
where certain materials are attracted by external magnetic field. Paramagnetism plays a pivotal role in
many important chemical processes such as catalysis. Furthermore, every material exhibits some form
of diamagnetism, pushing the material away from the strong magnetic field. For example,
superconductors are perfect diamagnets; they will repel strong permanent magnets to the extent that they
will hover in mid-air when placed on top of a magnet. This principle of magnetic levitation is at the
heart of the super-fast train, the MAGLEV.
The current experiment "Magnetic Phase Transitions" is quite different from other experiments. It
encourages the student to develop a deep understanding of magnetic materials especially paramagnetic
and ferromagnetic materials. It also involves an informal discussion by the instructor to discuss with the
students about the instruments and its various features. Student will learn about new equipment and
electric components probe the safety features, will perform the experiment under the watchful
supervision of the demonstrator.
You must follow all safety procedures and warnings. The experiment involves very large electric
currents that can seriously risk your safety, well-being and life.
5. 6
KEY CONCEPTS
Ferromagnetism - Paramagnetism - Curie point - Electrical Energy - Specific Heat Capacity - Stefan-
Boltzmann Law - Variable Transformer - Digital Multimeter - Clamp meter - Electrical Safety
APPROXIMATE PERFORMANCE TIME 4 Hours
1.2 Learning Outcomes
In this experiment, we will
1. learn how to handle large currents safely;
2. understand the role of insulators and conductors;
3. familiarize ourselves with common electrical test equipment such as the voltmeter, ammeter,
multimeter, clamp meter and circuit components such as the circuit breaker and variable
transformer (VARIAC);
4. learn to interpret important thermal and electrical properties of materials;
5. appreciate the instantaneous nature of phase transitions; and finally,
6. appreciate the inter-relationship between electricity, magnetism and thermodynamics.
1.3 Experimental Objectives
The experiment determines the Curie point of a ferromagnetic material as its temperature is raised with
the help of resistive heating. Besides the monitoring of the phase transition, we will also learn about the
use of electrical measurement equipment and safety practices that must be observed when designing,
operating or testing electric equipment.
6. 7
1.4 Theoretical Introduction
1.4.1 Magnetism in Materials
To a very good first approximation, the origin of magnetism in materials lies in the motion of electrons.
The magnetic material can be thought of as being composed of elementary magnets also called magnetic
dipoles. These are similar to tiny magnets with a north and south pole. An atom contains electrons in
motion. These electrons constitute a current and hence, produce a magnetic field. One such atom can be
thought of as an elementary magnet. Now the material as a whole, will be made up of many elementary
magnets. The arrangement and orientation of these elementary magnets determine the overall magnetic
properties.
Paramagnetic Materials
In paramagnetic materials, the elementary magnets are all randomly oriented. Suppose, we draw a tiny
vector corresponding to the orientation of the dipole. Now take the vector sum of these dipoles. What do
we get? The resultant is zero, showing that in the absence of an external field, the paramagnetic material
is un-magnetized. However, this observation does not mean that there are no elementary magnets. The
elementary dipoles still exist; it just happens that they completely cancel the effect of one another.
Once we apply an external field with intensity H, the dipoles rotate and tend to orient in the direction of
the field. This overall alignment results in a net magnetization M of the sample. The alignment,
however, is by no means perfect. At any higher temperature than absolute zero, the thermal agitation
will kick them out of perfect alignment. The situation is clearly depicted in Figure 1.1. The
magnetization vector is defined as,
𝑀⃗⃗ =
∑ 𝜇 𝑘𝑘
𝑉
where 𝜇 𝑘 is the dipole moment of the elementary magnet and V is the total volume of the sample.
7. 8
Figure 1.1: The alignment of the elementary magnets in a paramagnetic sample. (a) Shows the situation when the
applied field is zero. (b) As the applied field intensity H is increased, the magnets preferentially tip in the direction
of the applied field, resulting in a net magnetization of the sample.
Ferromagnetic Materials
On a microscopic level, approximately millionth of a meter, metals look like drought struck soil of the
summer sun. These ‘cracked segments’ are called grains and the cracks are called grain boundaries. As
the name suggests, grain boundaries separate one grain from another.
Ferromagnetic materials are quite distinct in their character from paramagnetic materials. Ferromagnets
have regions called magnetic domains. Elementary magnets within each domain are aligned with respect
to one another, even though the domains can be aligned in all possible directions.
As the applied field intensity H is increased, the domains that are favourably aligned, i.e., tilted towards
the applied field, grow in size and the unfavourably oriented domains shrink. As the applied field is
ramped up, the growing domain engulfs the smaller domains with the result that there is one domain per
grain. Finally, with a sufficiently strong field, the magnetization of the grain (=magnetization of the
domain) rotates so as to align itself with the applied field.
8. 9
Figure 1.2: The magnetic moments, domains and grains in a ferromagnetic material. (a) The grains and domains in
a polycrystalline material. One grain comprises several domains and the magnetization within a domain is
indicated by a purple arrow. (b) Domain microstructure of an amorphous ribbon. (c-g) illustrations for a single
grain. (c) The magnetization is zero in the absence of the applied field intensity H. (d-f) As the applied field
increases, domains grow and shrink, to the extent that there is only one domain per grain, and (g) finally, the
magnetization rotates in the direction of the applied field.
Curie Temperature
In physics and materials science, the Curie temperature (𝑇𝑐), or Curie point, is the temperature where a
material's permanent magnetism changes to induced magnetism. The force of magnetism is determined
by magnetic moments.
The Curie temperature is the critical point where a material's intrinsic magnetic moments change
direction. Magnetic moments are permanent dipole moments within the atom which originate from
electrons' angular momentum and spin. Materials have different structures of intrinsic magnetic
moments that depend on temperature. At a material's Curie Temperature those intrinsic magnetic
moments change direction.
9. 10
Ferromagnets have a much higher magnetization than paramagnets. In addition, the phenomenon of
ferromagnetism comes about due to a totally different mechanism. In ferromagnetic materials, the
elementary magnets act in a cooperative fashion, forcing neighbouring magnets to align within
themselves. Soon all elementary magnets within a domain are unitedly pointing in one direction. This
configuration lowers the energy, called the exchange energy.
The exchange energy, however, acts in conflict with the thermal energy that tends to misalign the
elementary magnets. As the temperature is increased, the thermal energy starts dominating over the
exchange energy and the magnetization drops. However, the material is still ferromagnetic as the
domain structure is preserved. Above a critical temperature, the Curie temperature 𝑇𝑐, the ferromagnet
suddenly turns into a paramagnet. The 𝑇𝑐's of the most common ferromagnets are presented in the table
given below.
Elements 𝑻 𝒄 (℃)
Fe 770
Ni 358
Co 1127
Gd 16
1.4.2 Electrical Energy
Electrical energy is the energy newly derived from electric potential energy. When loosely used to
describe energy absorbed or delivered by an electrical circuit (for example, one provided by an electric
power utility) “electrical energy” talks about energy which has been converted from electrical potential
energy.
1.4.3 Specific Heat Capacity
Temperature and heat are not the same thing:
temperature is a measure of how hot something is
heat is a measure of the thermal energy contained in an object.
10. 11
Temperature is measured in °C, and heat is measured in J. When heat energy is transferred to an object,
its temperature increase depends upon the:
the mass of the object
the substance the object is made from
the amount energy transferred to the object.
For a particular object, the more heat energy transferred to it, the greater its temperature increase.
The specific heat capacity of a substance is the amount of energy needed to change the temperature of 1
kg of the substance by 1°C. Different substances have different specific heat capacities. The table shows
some examples.
Heat Capacities of Different Substances
Substance Specific heat capacity in J / kg °C
Water 4181
Oxygen 918
Lead 128
1.5 Stefan-Boltzmann Law
Stefan–Boltzmann law states that the total radiant heat energy emitted from a surface is proportional to
the fourth power of its absolute temperature.
Formulated in 1879 by Austrian physicist Josef Stefan as a result of his experimental studies, the same
law was derived in 1884 by Austrian physicist Ludwig Boltzmann from thermodynamic considerations:
if E is the radiant heat energy emitted from a unit area in one second and T is the absolute temperature
(in degrees Kelvin), then 𝐸 = 𝜎𝑇4
, the Greek letter sigma (σ) representing the constant of
proportionality, called the Stefan–Boltzmann constant. This constant has the value 5.6704 ×
11. 12
10−8
𝑤𝑎𝑡𝑡 𝑝𝑒𝑟 𝑚2
𝐾4
. The law applies only to blackbodies, theoretical surfaces that absorb all incident
heat radiations.
1.6 Apparatus and Experimental Preparation
There are several examples of undergraduate experiments used to determine the 𝑇 𝑐 for various materials.
A schematic sketch of the apparatus is shown in Figure 1.4 and photographs of some of the components
are presented in Figure 1.3. Given below is a short description of the equipment used.
1.6.1 Variable Transformer (VARIAC)
The VARIAC (Electrodynamics Works, Karachi) is a variable transformer. The AC mains supply from
WAPDA (or the local generator) is connected across the primary coil and the variable output is taken
from the sliding contact on the output side. The voltage is step down in the ratio of
𝑉𝑜𝑢𝑡
𝑉𝑖𝑛
=
𝑁𝑜𝑢𝑡
𝑁𝑖𝑛
=
𝐼𝑜𝑢𝑡
𝐼𝑖𝑛
where 𝑁𝑖𝑛 and 𝑁𝑜𝑢𝑡 are the total number of turns in the primary coil and the turns between the output
tap and ground.
1.6.2 Digital Multimeter
A digital multimeter (GW-INSTEK GDM-451) measures the output voltage from the VARIAC.
1.6.3 Clamp Meter
Currents are measured with the help of a clamp meter (Kyoritsu). The jaws of the clamp meter surround
the wire through which the current is to be determined.
1.6.4 Control Box
The control box has been designed and assembled in-house and serves as the main electric distribution
box for the experiment. The panel is fitted with an analog voltmeter and ammeter that measure,
respectively, the AC mains voltage and the current through the heating element. However, we will use
12. 13
the clamp meter for the most accurate current readings. The box is also fitted with a red emergency stop
button. The button can be reset by turning it clockwise and releasing.
The control box is also fitted with a circuit breaker (Terasaki) rated at 15A. As soon as the current goes
beyond the rated value, the circuit breaker trips and opens the circuit; the current drops to zero. For
electric protection of the circuit components, a magnetic contactor (NHD Industrial Co., Taiwan, SC-16)
has also been used.
The exposed metal parts of the apparatus, including the mounting screws of the control box, have all
been earthed. This prevents electric shocks if by accident or damage, a live wire comes in contact with
the metal body.
1.6.5 Ferromagnetic Heating Element
In our experiment, current passes through a ferromagnetic heating element. The element we have chosen
is a commercially available material called Kanthal-D (Kanthal and Hyndman Industrial Products). We
will use a heating element approximately 100 cm in length and wound into a spiral shape. Some
important properties of Kanthal-D alloy are also presented in the table given below.
Property Value
Composition 73% Fe 22%Cr 4.8%Al
Specific heat capacity c 460 J kg-1
K-1
Resistivity ρ at 20℃ 1.39 Ω mm2
m-1
Emissivity ε 0.7
Density 7.25 g cm-3
Melting point 1500 ℃
1.6.6 Pole for Kanthal and Magnet Assembly
The pole for the Kanthal and magnet assembly was fabricated locally (Noor Trading and Consultancy,
Rawalpindi) and modified in-house. The Kanthal wire is hooked up between porcelain insulators fixed
to the top and bottom arms (see Figure 1.3(e)). The middle arm has an array of ferrite disk magnets
(Hall Road) epoxied onto an alumina silicate base. The whole pole assembly is made of mild steel.
13. 14
(a) (b)
(c) (d) (e)
(f)
Figure 1.3: Photographs of selected components: (a) VARIAC, (b) electric panel box (control box),
(c) digital multimeter, (d) clamp meter, (e) pole for ferromagnetic heating element, (f) Kanthal wire.
14. 15
Figure 1.4: Schematic diagram of the experimental setup.
1.7 Experimental Procedure
1.7.1 Inspection
The mains supply is still switched off. Follow all the rules and safety procedures. In this section, we will
test the safety features of the circuit. The electric current in this experiment can kill! Follow all rules.
1. Visualize and sketch a possible circuit diagram for the experiment? (can be hold for viva
question)
2. Check the zero error for the analog voltmeter and ammeter on the control box. Use the
adjusting screw at the base of the pointer to correct.
15. 16
3. Attach a three-pin shoe to the WAPDA's mains.
4. Ask the instructor to check the electrical connections. Do not attempt to switch on the mains
supply in the absence of the demonstrator.
5. Set the regulator on the VARIAC to its minimum output voltage, zero.
6. Press the green START button on the control box.
7. Check that there is no current leakage using a tester in all three components (VARIAC, control
box and pole). Put the tester on bare metal surface to check for leakage.
8. Slowly increase the output voltage (voltage from the output of the VARIAC) to 15 V. Check
for current leakage again.
9. What is the reading on the clamp meter?
10. Test the emergency stop button. Does the clamp meter reading go to zero? If it doesn't,
immediately inform the instructor.
11. Set the regulator on the VARIAC to its minimum output voltage, zero again and press the
green START button.
12. Test the circuit breaker.
13. Hook the clamp meter to the WAPDA mains and measure the current.
1.7.2 Measurement of Curie Temperature
1. Set the output voltage regulator on the VARIAC to 22 V and press the green START button.
2. Measure the current (using the clamp meter) and the time it takes the wire to reach the Curie
temperature. You will be provided with a stopwatch.
3. When the heating element snaps away from the magnet, immediately press the red STOP button
to switch o the circuit.
16. 17
4. Switch off the mains supply.
1.8 Calculations
The electrical energy supplied in a certain interval of time is defined as
𝐸 = 𝑉𝐼𝑡
In the present experiment, this energy is used up in two processes:
1. absorbed by the heating element, raising its temperature from the ambient room temperature 𝑇0
to the Curie temperature 𝑇𝑐 ; and
2. radiated away by the heating element.
The energy absorbed 𝐸 𝑎 may be expressed as
𝐸 𝑎 = 𝑚𝑐(𝑇𝑐 − 𝑇0)
where m is the mass of the wire and c the specific heat capacity. The mass can be measured using the
provided weigh balance.
The energy radiated (𝐸𝑟) form the wire is,
𝐸𝑟 = 𝜀𝜎𝑆(𝑇𝑐
4
− 𝑇0
4
)𝑡
where 𝑇𝑐 is the Curie temperature, ε is the emissivity, σ is the Stefan-Boltzmann constant (𝜎 = 5.675 ×
10−8
𝑊/𝑚2
𝐾4
) and S is the surface area of the heating element.
1.9 MATLAB Task
Run MATLAB on the PC and solve the energy balance equation using command.
≫ solve('equation')
where equation is inserted within single quotes and represents the MATLAB format for the energy
balance equation.
17. 18
1.10 Experiment Questions
Q. No. 1 What is coercivity?
Q. No. 2 Which material has more coercivity; soft iron or steel?
Q. No. 3 Why we use AC current in our household usage?
Q. No. 4 What is the composition of Kanthal-D wire?
Q. No. 5 What is the reason of Earth’s magnetic field?
Q. No. 6 Distinguish between hard magnetic materials and soft magnetic materials?
Q. No. 7 Which magnetic material is used in the core of the transformer?
Q. No. 8 Which one is better to make permanent magnet; steel or iron?
Q. No. 9 How does a clamp meter work? Will the clamp meter work for direct current (DC)?
Q. No. 10 What is the difference between a circuit breaker and a fuse?
Q. No. 11 What is the function of the earth wire? Draw a simple diagram to describe your
reasoning?
Q. No. 12 What is the role of the magnetic contactor in the circuit?
Q. No. 13 Why have we used metal to construct the pole?
Q. No. 14 Why have we used porcelain for mounting the heating element on the pole?
Q. No. 15 Why cannot we attach the magnets directly to the metallic post? Why do we need to
insert the alumina silicate ceramic in between?
Q. No. 16 In the experiment we will use a tester to detect current leakage. The tester is made
to touch a conductor. If the conductor is live, a small bulb inside the tester will glow.
How does a tester work?
Q. No. 17 What are the different colour codes for wires in live, neutral, earth? Suggest why do
we have two additional colors.
Q. No. 18 What is Exchange energy?
Q. No. 19 What will happen when thermal energy overcomes the exchange energy?
Q. No. 20 Identify any three paramagnetic materials in your surroundings?
18. 19
1.11 References
[1] “Specific heat capacity”, Web: http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/
heatingandcooling/buildingsrev3.shtml.
[2] S. O. Kasap, “Principles of Electronic Materials and Devices”, McGraw Hill, (2006).
[3] W. D. Callister, “Materials Science and Engineering: An Introduction”, 6th Edition, John Wiley
& Sons., (2004).
[4] R. Schaeffer, G. Herzer, “Continuous magnetization patterns in amorphous ribbons”, IEEE
Trans. Magn. 37, 2245 (2001).
[5] S. Valesco, F. L. Roman, “Determining the Curie temperature for iron and nickel”, Phys.
Teacher 45, 387 (2007).
[6] T. Lewowski, K. Wozniak, “Measurement of Curie temperature for gadolinium: a laboratory
experiment for students”, Eur. J. Phys. 18, 453 (1997).
[7] “Electrical energy”, Web: https://en.wikipedia.org/wiki/Electrical_energy.
[8] C. Kizowski, S. Budzik, J. Cebulski, “Finding the Curie temperature for ferromagnetic
materials”, Phys. Teacher 45, 31 (2007).
[9] “Resistance heating alloys and systems for industrial furnaces”, Kanthal, Web:
http://ravi.lums.edu.pk/physlab.
[10] M. Connors, “Measurement and analysis of the field of disk magnets”, Phys. Teacher 40, 308
(2002).
[11] J. P. V. Hof, J.A. Bain, R.M. White, J-G. Zhu, “An undergraduate laboratory in magnetic
recording fundamentals”, IEEE. Trans. Educat. 44, 224 (2001).
[12] A. A. Clauss, R. M. Ralich, R. D. Ramsier, “Hysteresis in a light bulb: connecting electricity
and thermodynamics with simple experiments and simulations”, Eur. J. Phys. 22, 385 (2001).