This document discusses the cooking mechanism in microwave ovens. It begins by explaining what microwave radiation is and how it is used to cook food by causing water molecules in the food to vibrate, generating heat. It then discusses the history and development of microwave ovens, how they work, and the key components involved like the magnetron. It also covers safety considerations regarding microwave radiation exposure and standards.
Super conductors,properties and its application and BCS theorysmithag7
superconductors:-Introduction, definition, type1,type2 and atypical. Preparation of high temperature super conductor-Y1 Ba2Cu3Ox±δ, BCS theory and general application of high temperature super conductors.
I. Electronic properties of nanomaterials.
Physics of inorganic nanostructures: Band structure engineering, quantum confinement, quantum wells/wires/dots, electronic states, energy levels and density of states, selected experimental results on characterization (STS, WF mapping, optical spectroscopy) and applications (lasers, single photon sources, single electron transistors).
Physics of organic nanosystems: Carbon nanostructures (nanotubes, fullerenes and graphene: band structure, Dirac Points, electronic properties, Raman spectra, electronic transport, Klein tunneling and applications), charge transport in conductive polymers and organic semiconductors.
The presentation opens up by introducing Schrodinger's time dependent and independent wave equation. Then it covers the derivation of time independent wave equation, followed by its applications.
Super conductors,properties and its application and BCS theorysmithag7
superconductors:-Introduction, definition, type1,type2 and atypical. Preparation of high temperature super conductor-Y1 Ba2Cu3Ox±δ, BCS theory and general application of high temperature super conductors.
I. Electronic properties of nanomaterials.
Physics of inorganic nanostructures: Band structure engineering, quantum confinement, quantum wells/wires/dots, electronic states, energy levels and density of states, selected experimental results on characterization (STS, WF mapping, optical spectroscopy) and applications (lasers, single photon sources, single electron transistors).
Physics of organic nanosystems: Carbon nanostructures (nanotubes, fullerenes and graphene: band structure, Dirac Points, electronic properties, Raman spectra, electronic transport, Klein tunneling and applications), charge transport in conductive polymers and organic semiconductors.
The presentation opens up by introducing Schrodinger's time dependent and independent wave equation. Then it covers the derivation of time independent wave equation, followed by its applications.
X-RAY GENERATOR CIRCUIT DIAGRAM , PRODUCTION OF X-RAYS AND INTRACTION OF X-RAY WITH MATTER.
THIS PRESENTATION CONSISTS LOT OF ANIMATIONS YOU WOULD LOVE TO WATCHING IT.
JUST DOWNLOAD AND ENJOY
This file contains full description of all parts of microwave and all kind of information related to microwave oven that could help you in technical terms.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
2. WHAT IS MICROWAVE RADIATION?
• Microwaves are a form of electromagnetic energy,like lightwaves or
radio waves.
• Its frequency ranges from 300 MHz(0.3GHz) to 300 GHz.
• Microwaves are used extensively in communications.
• Good for transmitting information because it can penetrate haze,light
rain,snow,clouds and smoke.
• Also used in radars and in detecting speed cars.
• Microwave has become most familiar as the energy source for
cooking food.
3. ELECTROMAGNETIC SPECTRUM
• Electromagnetic radiation exists in a range of frequencies
called the electromagnetic spectrum.
• Each frequency has a specific wavelength and as the frequency
decreases, the actual length of the wave gets longer.
• The frequency used in microwave oven is 2.45GHz.
C=f(lamda)
4. HISTORY OF MICROWAVE OVEN
• In 1945, Percy Spencer, working for Raytheon to develop magnetrons
for active radar signals, noticed a chocolate bar in pocket melted
while standing infront of an operating magnetron.
• He then tested popcorn infront of the magnetron and it quickly
popped all over the room.
• In 1947, Raytheon made the first microwave oven Radarange (6 ft
tall,3000W power and $3K) but did not sell well. In 1965, a counter
top version was developed for $495.
5. HOW DOES MICROWAVE OVEN COOK
FOOD?
• Microwave ovens selectively make liquid(water) hot. Most food,
even dry foods, have water in them.
• Water(H2O) is a polar molecule with 2 hydrogen atoms being
more positive then the single oxygen atom.
• In liquid water, the molecules are in constant motion and are
normally oriented.
6. CONTD…
• Glass, paper, ceramic or plastic containers are used in
microwave cooking because the microwaves pass through
them.
• Metals reflect microwaves so unsafe to have metal pans,
aluminium foil in oven, may damage oven.
7. WHAT HAPPENS WHEN WATER MOLECULES
ARE IN ELECTRIC FIELD?
• The molecules will experience in a torque from the electric field
and become aligned with direction of the field.
• Therefore, water molecules are oriented by the electric field.
8. WHAT HAPPENS TO WATER MOLECULES IN
OSCILLATING ELECTRIC FIELD?
• The water molecules follow the oscillations of the electric field.
• They collide more frequently with the molecules around them.
• The molecules move faster and faster and the temperature
increases(heating).
9. WHY DO THEY HAVE TURNTABLES?
• Microwaves are reflected by the oven wall, forming “standing waves”
in the cooking chamber.
• Standing Waves: Waves that oscillate in place.
• Node-Zero amplitude(no oscillation) at all times.
• Anti-nodes-Locations with maximum amplitude.
• Inside a microwave oven, the electromagnetic waves also form
standing waves from reflections at the walls.
• Without a turntable, the food will not be cooked uniformly.
10. INTERACTION OF MICROWAVES WITH
METALS
• Microwaves, incident on the metal walls of the oven, behave
similarly to visible light hitting a mirror.
• The microwaves are absorbed very effectively, since the electric
fields of the waves interact very slowly and strongly with nearly
free electrons of the metal. These accelerated electrons re-
radiate electromagnetic waves at the same frequency and in
phase, hence the microwaves are perfectly radiated.
11. MAGNETRON
• Magnetron is an electronic device which generates high energy
microwaves. It is the core element in a microwave oven.
• Working Principle: When a charge/charge particle accelerates in
space, it generates electromagnetic waves.
• This statement is the derivation of Maxwell’s law which states
that a classical electromagnetic radiation is ultimately
generated when a charged particle is accelerated through
space.
13. CATHODE
• Cathode in magnetron is a tungsten filament which emits
electrons on the principle of thermionic emission when an
optimum voltage is applied.
14. ANODE
• Anode in magnetron is a copper cup like structure which is a
little bit modified to perform more functions than a simple
anode does.
15. PERMANENT MAGNET
• The purpose of the permanent magnet is to apply a continuous
magnetic field across the cathode area.
16. WORKING OF MAGNETRON
• Electrons from a hot filament would travel radially to the
outside the ring if it were not for the magnetic field. The
magnetic force deflects them in the sense shown and they tend
to sweep around the circle. In so doing, they “pump” the natural
resonant frequency of the cavities. The currents around the
resonant cavities cause them to radiate electromagnetic energy
at that resonant frequency.
17. THEORY
• In a magnetron, the sources of electrons is a heated cathode located
on the axis of an anode structure containing a number of microwave
resonators. Electrons leave the cathode and are accelerated towards
the anode, due to the DC field established by the voltage source E.
• The presence of a strong magnetic field B in the region between
cathode and anode produces a force on each electron which is
mutually perpendicular to the DC field and the electron velocity
vectors, thereby causing the electrons to spiral away from the
cathode in paths of varying curvature, depending upon the initial
electron velocity at the time it leaves the cathode.
18. CONTD..
• Inside the anode there are a number of cavities designed to
resonate at 2.45GHz. A voltage of several KV is applied
between the electrodes and a magnetic field is applied parallel
to the axis such that electric field and magnetic fields are
perpendicular to each other.
19. THEORY OF OPERATION OF MICROWAVE
OVEN
• In the high-voltage section of a microwave oven, the diode and
the capacitor function together to effectively double the
already-high voltage. This is called Voltage-doubler Circuit.
• Voltage-doubler circuits are fed up with the stepped-up AC
voltage from the high voltage transformer’s secondary(output)
winding. Typically a transformer would step-up 220 volts to
about 2000 volts, which would have an approx. peak value of
2800 volts.
20. THE HALF-WAVE DOUBLE VOLTAGER
• During the first positive half cycle, which is designated on the
sine wave graph as T1, the voltage from the transformer
increases accordingly with the polarity shown.
• The transformer secondary and the charged capacitor and the
sum voltage of 5600 volts is applied to the magnetron cathode.
21. CONTD..
• There are two fundamental characteristics of this 5600 volt
output
• First, because a voltage doubler is also a rectifier, the output is a DC
voltage.
• Second, the resulting output voltage that is applied to the magnetron
tube is actually a pulsating DC voltage. This is because the doubler
generates an output only during the negative-half cycle of the
transformer’s output(secondary) voltage.
• So, the magnetron tube is infact pulsed on and off at the rate of 50 or
60 times per second, depending on the frequency of the line voltage.
22. RADIATION AND ITS TYPES
• Radiation is the release of the energy from any substance(source) and
travel through space in the form of Electromagnetic Waves.
• There are many different sources of energy around us. For Example,
our bodies give off heat, which is a form of energy. Energy is also
released from everyday things such as:
a) Household electrical appliances
b) Heaters
c) The Sun
d) X-ray machines.
23. • Not all radiations are harmful. It depends on the type of
radiation and how much exposure to it you have. There are
several types of radiation. All of which can be grouped under
either
Ionizing Radiation
Non-ionizing Radiation.
24. IONIZING RADIATION
• Radiation that has enough energy to remove tightly bound
electrons from atoms, thus creating ions. This is the type of
radiation that people usually think of as ‘radiation’. For
Example:
Alpha Particles
Beta Particles
Gaama Rays
X-rays.
25. NON-IONIZING RADIATION
• Radiation that has enough energy to move atoms in a molecule
around or cause them to vibrate, but not enough to remove
electrons, is referred as “Non-ionizing Radiation”. For Example:
UV rays from Sun
Sound Waves
Radio waves
Radiation waves given off from household electrical appliances, heaters,
mobile phones with or without headsets, and computers.
26. BIOLOGICAL EFFECTS
• Non-ionixing radiation can produce non-mutagenic effects such as inciting
thermal energy in biological tissue that can lead to burns. Recently, the IARC
from WHO released a statement indicating that radiofrequency
electromagnetic fields(including microwave) are possibly carcinogenic to
Humans.
• Certain body organs are particularly sensitive to the thermal effect of
microwaves. For Example, if the lens of the eye were exposed to excessive
heat from microwaves, its circulatory system would be look like the white of
an egg.
• Exposure to high levels of microwaves can cause cataracts. Also, the
stomach, intestines and bladder are especially sensitive to thermal damage
from high levels of microwaves.
27. SAFETY STANDARDS
• Safety code 6 part-III(Microwave Ovens) of the Radiation
Emitting Devices Regulations(C.R.C.C 1370) specifies the limit
for the leakage radiation at 5cm from the surface of the
microwave oven to be 5.0 mW/cm2.
• ANSI/IEEE-C95.1-1991 the power density should not exceed
1.6mW/cm2 at 2450 MHz(microwave oven frequency) for
human exposure in uncontrolled environments.
28. SAFETY TIPS
• Do not operate oven when empty.
• Exercise extreme caution if you have a pacemaker impact.
• Keep out of reach of children. Do not permit young children to
operate the oven.
• Do not put face close to door window area when oven is
operating.