The document summarizes the work of the Photon Factory group, which uses short laser pulses to probe chemistry and physics processes on ultrafast timescales. The group conducts research in areas like photochemistry, laser micro- and nanomachining, and developing new photoactive materials. It has capabilities for pulses from nano- to femtoseconds across UV to IR wavelengths. Current projects include studying photochemistry of diphosphenes using ultrafast spectroscopy and quantum chemistry calculations. The group collaborates widely and is supported by various university and national funding sources.
This document summarizes a study of the photoluminescence and relaxation processes in MEH-PPV (poly(2-methoxy-5-(2-ethylhexyloxy)-p-phenylene-vinylene)). The study found two main thermal relaxation transitions in MEH-PPV: a glass transition around 340 K and a β-relaxation between 200-220 K. The glass transition is strongly correlated with the dissociation of fluorescent emissive interchain complexes, while the β-relaxation involves movements of the lateral substituents and CH2 groups along the polymer backbone. NMR experiments showed increasing mobility through the side chains, with carbons closer to the aromatic ring being more rigid. A kinetic
This document describes the synthesis and characterization of a new type of optically active polymer. The polymer was created by grafting electrochromic viologen groups to the side chains of a helical polyacetylene backbone. This produced a polymer with a single-handed helical structure and viologens positioned asymmetrically along the chains. The polymer exhibited large optical rotation and new circular dichroism bands in the visible/near-infrared range upon reduction of the viologens. It also demonstrated redox-switchable chiroptical properties, making it a potential material for applications like chirowaveguides.
1. The document discusses projectile motion and provides an example problem of calculating the motion of a ball launched at a 30 degree angle from a table 1 meter high.
2. It explains that projectile motion can be used to study how objects move through the air or space, and gives some everyday examples.
3. Conservation of energy can also be used to solve projectile motion problems, since the only force acting is gravity, and the horizontal velocity does not change.
The document summarizes the history and science behind lasers. It discusses how the laser was first conceived in the 1950s and built in 1960. It then explains the basic components of a laser including an energy input source and a gain medium that produces stimulated emission when pumped with energy. Examples of common laser types and materials are provided. Applications of lasers in spectroscopy, surgery, and distance measurements to the moon are also mentioned.
Lasers emit light that is highly directional, monochromatic, and coherent. Common laser components include an active medium, excitation mechanism, and high and partially reflective mirrors. Lasing occurs when atoms in the active medium are excited and stimulated emission produces photons. Laser output is measured in watts, joules, irradiance, and pulsed vs. continuous wave. Laser hazards include eye, skin, chemical, electrical, and fire risks. Lasers are classified based on wavelength, average power, energy per pulse, and beam exposure to determine appropriate safety controls.
Civic Exchange - 2009 The Air We Breathe Conference - Latest News on PM 2.5 —...Civic Exchange
Civic Exchange 2009 The Air We Breathe Conference - Experts Symposium 9 January 2009
Latest News on PM 2.5 — Implications for Public Health
presented by Dr John Froines (South California Particle Centre)
http://air.dialogue.org.hk
This document summarizes a study of the photoluminescence and relaxation processes in MEH-PPV (poly(2-methoxy-5-(2-ethylhexyloxy)-p-phenylene-vinylene)). The study found two main thermal relaxation transitions in MEH-PPV: a glass transition around 340 K and a β-relaxation between 200-220 K. The glass transition is strongly correlated with the dissociation of fluorescent emissive interchain complexes, while the β-relaxation involves movements of the lateral substituents and CH2 groups along the polymer backbone. NMR experiments showed increasing mobility through the side chains, with carbons closer to the aromatic ring being more rigid. A kinetic
This document describes the synthesis and characterization of a new type of optically active polymer. The polymer was created by grafting electrochromic viologen groups to the side chains of a helical polyacetylene backbone. This produced a polymer with a single-handed helical structure and viologens positioned asymmetrically along the chains. The polymer exhibited large optical rotation and new circular dichroism bands in the visible/near-infrared range upon reduction of the viologens. It also demonstrated redox-switchable chiroptical properties, making it a potential material for applications like chirowaveguides.
1. The document discusses projectile motion and provides an example problem of calculating the motion of a ball launched at a 30 degree angle from a table 1 meter high.
2. It explains that projectile motion can be used to study how objects move through the air or space, and gives some everyday examples.
3. Conservation of energy can also be used to solve projectile motion problems, since the only force acting is gravity, and the horizontal velocity does not change.
The document summarizes the history and science behind lasers. It discusses how the laser was first conceived in the 1950s and built in 1960. It then explains the basic components of a laser including an energy input source and a gain medium that produces stimulated emission when pumped with energy. Examples of common laser types and materials are provided. Applications of lasers in spectroscopy, surgery, and distance measurements to the moon are also mentioned.
Lasers emit light that is highly directional, monochromatic, and coherent. Common laser components include an active medium, excitation mechanism, and high and partially reflective mirrors. Lasing occurs when atoms in the active medium are excited and stimulated emission produces photons. Laser output is measured in watts, joules, irradiance, and pulsed vs. continuous wave. Laser hazards include eye, skin, chemical, electrical, and fire risks. Lasers are classified based on wavelength, average power, energy per pulse, and beam exposure to determine appropriate safety controls.
Civic Exchange - 2009 The Air We Breathe Conference - Latest News on PM 2.5 —...Civic Exchange
Civic Exchange 2009 The Air We Breathe Conference - Experts Symposium 9 January 2009
Latest News on PM 2.5 — Implications for Public Health
presented by Dr John Froines (South California Particle Centre)
http://air.dialogue.org.hk
NMR spectroscopy is a technique that uses magnetic fields and radio waves to determine structural information about molecules. It has various applications in biology, such as determining molecular structures, studying drug metabolism and protein folding, analyzing phosphate metabolism in living cells, and studying nucleic acids and lipid bilayers. NMR spectroscopy is also used in magnetic resonance imaging (MRI) to produce detailed images of organs and tissues in the body without using ionizing radiation.
Photoluminescence spectroscopy is a technique that measures the emission of light from a material that has absorbed photons. The document outlines the basic principles of photoluminescence, how the technique is performed using instrumentation like luminescence spectrometers, and the types of information that can be obtained from photoluminescence spectra like material composition, quality, and defects. Examples of photoluminescence spectra are provided for materials like semiconductors and applications of the technique discussed, such as for studying semiconductors and nanomaterials.
ML-3 - Persistent Phosphors under PressurePhilippe Smet
Slides from plenary talk at the Third Conference on Mechanoluminescence and Novel structural health diagnosis, Hong Kong, December 15-17 2017. Covers absolute trapping capacity of persistent phosphors, the number and nature of energy traps and ML in selected compounds (BaSi2O2N2:Eu and CaZnOS:Mn).
We are confident that under my tutelage, Physics will be made simpler and more enjoyable for you. Mastering Physics will no longer be a far-fetched dream.
Photoluminescence spectroscopy involves absorbing photons which causes photoexcitation, followed by re-emission of photons of longer wavelength. It provides information on material properties like composition, stress, and quality by analyzing peak frequencies, widths, intensities and polarization in the captured spectra. Applications include determining semiconductor band gaps and studying nanomaterials. The document discusses the basic physics, instrumentation, examples and conclusions of photoluminescence spectroscopy.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
This document is a synopsis submitted for the degree of Doctor of Philosophy in Physics at Annamalai University. It summarizes experimental and theoretical vibrational spectroscopic investigations on several organic compounds, including Schiff bases, benzenesulfonamides, amino acids, and biphenyl derivatives. Quantum chemical computations using methods like HF and DFT were used to interpret vibrational spectra from techniques like IR, Raman, and FT-Raman spectroscopy. The synopsis reviews related literature and describes the instrumentation and methodology used in the experimental and computational investigations.
This document summarizes a research article that presents a novel biosensor for detecting nitrite based on a single-layer graphene nanoplatelet (SLGnP)-protein composite film. The composite film is created by combining SLGnP, tetrasodium 1,3,6,8-pyrenesulfonic acid (TPA), and myoglobin protein and casting it on a glassy carbon electrode. Characterization shows the protein retains its structure and there are strong electrostatic interactions between the components in the film. Electrochemical analysis demonstrates the composite film enhances the direct electron transfer of the protein and can catalytically reduce nitric oxide. The resulting biosensor exhibits high sensitivity, a low detection limit, good stability and reproducibility for
This document summarizes a study that used photoacoustic monitoring to characterize the macroscopic orientational order in disperse red 1 (DR1) azo-dye based dissolutions. The experimental setup applied voltages up to 6.1 kV to induce orientation in the DR1 molecules and measured the resulting photoacoustic signals. Analysis of the averaged signals, Fourier amplitudes, and correlations showed an increase in anisotropy and orientational order with higher voltages. Specifically, the applied field changed the phase from isotropic to anisotropic with anisotropy of around 5.6% and orientational order of about 10% according to photoacoustic measurements. The study demonstrated the viability of the photoacoustic technique for characterizing orientational
The document summarizes research on implanting alkali metal atoms into nanosized cavities within metal oxide-based organic-inorganic hybrid materials. The research aims to synthesize tungsten or molybdenum oxide hybrids, implant metals like sodium, calcium or potassium via ion implantation, and characterize the materials' structures before and after implantation. Physical property measurements of resistivity on bulk samples and thick films are also discussed. The goal is to induce insulator-to-metal transitions and incorporate charge carriers through metal ion doping within the small cavities of these hybrid host materials.
1) The myosin lattice in vertebrate muscle exhibits rotational disorder that can be modeled as a geometrically frustrated system like the triangular Ising antiferromagnet.
2) Electron microscopy and x-ray diffraction imaging techniques were used to directly image and characterize the disorder in the myosin lattice.
3) Computational models incorporating triangular Ising antiferromagnet disorder were able to simulate the observed x-ray diffraction patterns from muscle tissue.
1. The document discusses measuring the electrical conductivity of brain tissue using different methods, finding values ranging from 0.01 to 0.7 S/m.
2. A 1D method using a syringe produced the most encouraging results so far.
3. Further studies aim to measure conductivity changes before, during, and after seizure-like events in mouse cortex to explore links between seizures and conductivity.
Carbon nanotubes are grown using chemical vapor deposition with a metal catalyst particle. Simulations show the carbon nanotube cap controls the chirality and diameter of the grown nanotube. For a nanotube to lift off and grow, the radius of the catalyst particle must be within a specific range determined by the particle's contact angle. The energetics of cap formation and lift off can be modeled and show good agreement with molecular dynamics simulations. Understanding how the cap detaches from the particle may allow controlling the chirality of the grown carbon nanotube.
The document summarizes a study that used synchrotron X-ray diffraction (XRD) and X-ray absorption spectroscopy (EXAFS) to characterize the local atomic structure of nickel-carbon catalyst materials with varying nickel concentrations (5-44% nickel). XRD showed different crystalline phases present before and after electrochemical treatment. EXAFS identified three structural regions - "Low" (5% Ni, large Ni-C bonds), "Medium" (11-24% Ni, mixture of Ni-Ni, Ni-C bonds), and "High" (35-44% Ni, crystalline Ni3C phase). The "High" Ni samples changed most after treatment, dissolving the Ni3C phase, while
This document summarizes research on dynamics at the nano- and microfluidic scale. It discusses topics like wetting, capillaries, droplets and surfaces. It also describes resistive pulse sensing to analyze translocations through nanopores and a semi-analytic model to understand the resistive pulse shape from such events. Finally, it acknowledges collaborators and funding sources for the research.
This document summarizes a new technique for x-ray imaging using a consumer grade digital SLR camera and reusable storage phosphor plates. It finds that the resolution of x-ray images captured with this method is comparable to laser scanning of storage phosphor plates. Additionally, this allows for portable and low-cost x-ray imaging. However, the sensitivity is still relatively low and needs further improvement. Future work includes additional field testing of the technique.
1) Combined fast neutron and dual energy gamma ray transmission (NEUDEG) measurements can non-invasively assess materials by taking advantage of each modality's sensitivities.
2) Dual energy x-ray systems resolve the transmitted x-ray beams in separate detectors to determine composition based on differing photon absorption properties of elements at different energies.
3) Industrial applications of NEUDEG and dual energy x-ray systems face challenges related to detector size and cost limitations, radiation shielding difficulties, and unreliable pulse shape discrimination electronics in industrial settings.
This document summarizes research on the effects of pressure on high-temperature superconductors. It includes figures showing the basic cuprate structure and phase diagrams. Key findings discussed are that undoped cuprates are anti-ferromagnetic insulators, and applying pressure can tune the antiferromagnetic superexchange strength and increase the superconducting transition temperature. Caveats mentioned are that the effects of pressure may depend on doping level and anisotropic pressure could have different impacts than hydrostatic pressure.
1. The document studies excitons and traps in rare-earth materials like Yb2+ doped CaF2 and SrF2 using a free-electron laser (FEL) combined with ultraviolet excitation.
2. Excitation creates an excitonic state where the excited electron becomes delocalized, leading to bond length changes and broad, red-shifted emission bands.
3. FEL excitation of the excitonic state is used to probe trap liberation, showing enhanced emission even after exciton decay, relevant to applications like phosphors.
NMR spectroscopy is a technique that uses magnetic fields and radio waves to determine structural information about molecules. It has various applications in biology, such as determining molecular structures, studying drug metabolism and protein folding, analyzing phosphate metabolism in living cells, and studying nucleic acids and lipid bilayers. NMR spectroscopy is also used in magnetic resonance imaging (MRI) to produce detailed images of organs and tissues in the body without using ionizing radiation.
Photoluminescence spectroscopy is a technique that measures the emission of light from a material that has absorbed photons. The document outlines the basic principles of photoluminescence, how the technique is performed using instrumentation like luminescence spectrometers, and the types of information that can be obtained from photoluminescence spectra like material composition, quality, and defects. Examples of photoluminescence spectra are provided for materials like semiconductors and applications of the technique discussed, such as for studying semiconductors and nanomaterials.
ML-3 - Persistent Phosphors under PressurePhilippe Smet
Slides from plenary talk at the Third Conference on Mechanoluminescence and Novel structural health diagnosis, Hong Kong, December 15-17 2017. Covers absolute trapping capacity of persistent phosphors, the number and nature of energy traps and ML in selected compounds (BaSi2O2N2:Eu and CaZnOS:Mn).
We are confident that under my tutelage, Physics will be made simpler and more enjoyable for you. Mastering Physics will no longer be a far-fetched dream.
Photoluminescence spectroscopy involves absorbing photons which causes photoexcitation, followed by re-emission of photons of longer wavelength. It provides information on material properties like composition, stress, and quality by analyzing peak frequencies, widths, intensities and polarization in the captured spectra. Applications include determining semiconductor band gaps and studying nanomaterials. The document discusses the basic physics, instrumentation, examples and conclusions of photoluminescence spectroscopy.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
This document is a synopsis submitted for the degree of Doctor of Philosophy in Physics at Annamalai University. It summarizes experimental and theoretical vibrational spectroscopic investigations on several organic compounds, including Schiff bases, benzenesulfonamides, amino acids, and biphenyl derivatives. Quantum chemical computations using methods like HF and DFT were used to interpret vibrational spectra from techniques like IR, Raman, and FT-Raman spectroscopy. The synopsis reviews related literature and describes the instrumentation and methodology used in the experimental and computational investigations.
This document summarizes a research article that presents a novel biosensor for detecting nitrite based on a single-layer graphene nanoplatelet (SLGnP)-protein composite film. The composite film is created by combining SLGnP, tetrasodium 1,3,6,8-pyrenesulfonic acid (TPA), and myoglobin protein and casting it on a glassy carbon electrode. Characterization shows the protein retains its structure and there are strong electrostatic interactions between the components in the film. Electrochemical analysis demonstrates the composite film enhances the direct electron transfer of the protein and can catalytically reduce nitric oxide. The resulting biosensor exhibits high sensitivity, a low detection limit, good stability and reproducibility for
This document summarizes a study that used photoacoustic monitoring to characterize the macroscopic orientational order in disperse red 1 (DR1) azo-dye based dissolutions. The experimental setup applied voltages up to 6.1 kV to induce orientation in the DR1 molecules and measured the resulting photoacoustic signals. Analysis of the averaged signals, Fourier amplitudes, and correlations showed an increase in anisotropy and orientational order with higher voltages. Specifically, the applied field changed the phase from isotropic to anisotropic with anisotropy of around 5.6% and orientational order of about 10% according to photoacoustic measurements. The study demonstrated the viability of the photoacoustic technique for characterizing orientational
The document summarizes research on implanting alkali metal atoms into nanosized cavities within metal oxide-based organic-inorganic hybrid materials. The research aims to synthesize tungsten or molybdenum oxide hybrids, implant metals like sodium, calcium or potassium via ion implantation, and characterize the materials' structures before and after implantation. Physical property measurements of resistivity on bulk samples and thick films are also discussed. The goal is to induce insulator-to-metal transitions and incorporate charge carriers through metal ion doping within the small cavities of these hybrid host materials.
1) The myosin lattice in vertebrate muscle exhibits rotational disorder that can be modeled as a geometrically frustrated system like the triangular Ising antiferromagnet.
2) Electron microscopy and x-ray diffraction imaging techniques were used to directly image and characterize the disorder in the myosin lattice.
3) Computational models incorporating triangular Ising antiferromagnet disorder were able to simulate the observed x-ray diffraction patterns from muscle tissue.
1. The document discusses measuring the electrical conductivity of brain tissue using different methods, finding values ranging from 0.01 to 0.7 S/m.
2. A 1D method using a syringe produced the most encouraging results so far.
3. Further studies aim to measure conductivity changes before, during, and after seizure-like events in mouse cortex to explore links between seizures and conductivity.
Carbon nanotubes are grown using chemical vapor deposition with a metal catalyst particle. Simulations show the carbon nanotube cap controls the chirality and diameter of the grown nanotube. For a nanotube to lift off and grow, the radius of the catalyst particle must be within a specific range determined by the particle's contact angle. The energetics of cap formation and lift off can be modeled and show good agreement with molecular dynamics simulations. Understanding how the cap detaches from the particle may allow controlling the chirality of the grown carbon nanotube.
The document summarizes a study that used synchrotron X-ray diffraction (XRD) and X-ray absorption spectroscopy (EXAFS) to characterize the local atomic structure of nickel-carbon catalyst materials with varying nickel concentrations (5-44% nickel). XRD showed different crystalline phases present before and after electrochemical treatment. EXAFS identified three structural regions - "Low" (5% Ni, large Ni-C bonds), "Medium" (11-24% Ni, mixture of Ni-Ni, Ni-C bonds), and "High" (35-44% Ni, crystalline Ni3C phase). The "High" Ni samples changed most after treatment, dissolving the Ni3C phase, while
This document summarizes research on dynamics at the nano- and microfluidic scale. It discusses topics like wetting, capillaries, droplets and surfaces. It also describes resistive pulse sensing to analyze translocations through nanopores and a semi-analytic model to understand the resistive pulse shape from such events. Finally, it acknowledges collaborators and funding sources for the research.
This document summarizes a new technique for x-ray imaging using a consumer grade digital SLR camera and reusable storage phosphor plates. It finds that the resolution of x-ray images captured with this method is comparable to laser scanning of storage phosphor plates. Additionally, this allows for portable and low-cost x-ray imaging. However, the sensitivity is still relatively low and needs further improvement. Future work includes additional field testing of the technique.
1) Combined fast neutron and dual energy gamma ray transmission (NEUDEG) measurements can non-invasively assess materials by taking advantage of each modality's sensitivities.
2) Dual energy x-ray systems resolve the transmitted x-ray beams in separate detectors to determine composition based on differing photon absorption properties of elements at different energies.
3) Industrial applications of NEUDEG and dual energy x-ray systems face challenges related to detector size and cost limitations, radiation shielding difficulties, and unreliable pulse shape discrimination electronics in industrial settings.
This document summarizes research on the effects of pressure on high-temperature superconductors. It includes figures showing the basic cuprate structure and phase diagrams. Key findings discussed are that undoped cuprates are anti-ferromagnetic insulators, and applying pressure can tune the antiferromagnetic superexchange strength and increase the superconducting transition temperature. Caveats mentioned are that the effects of pressure may depend on doping level and anisotropic pressure could have different impacts than hydrostatic pressure.
1. The document studies excitons and traps in rare-earth materials like Yb2+ doped CaF2 and SrF2 using a free-electron laser (FEL) combined with ultraviolet excitation.
2. Excitation creates an excitonic state where the excited electron becomes delocalized, leading to bond length changes and broad, red-shifted emission bands.
3. FEL excitation of the excitonic state is used to probe trap liberation, showing enhanced emission even after exciton decay, relevant to applications like phosphors.
This document summarizes David Wiltshire's timescape cosmology, an alternative to the standard cosmological model that accounts for large scale inhomogeneities in the universe. It proposes that spatial curvature gradients between overdense walls and underdense voids can lead to differences in the calibration of clocks and rulers between local observers and globally averaged observers. Several observational tests are discussed that provide tentative support for the timescape scenario over LambdaCDM, including supernova luminosity distances, baryon acoustic oscillations, and predictions of Hubble flow variance.
This document discusses supersymmetric dark matter and its potential detection by the IceCube neutrino observatory. It introduces the neutralino as a dark matter candidate particle arising from supersymmetry. Neutralinos could accumulate in celestial bodies like the Sun due to gravitational interactions and weak/gravitational forces. Their annihilation could produce neutrino signals detectable by IceCube. The document outlines scans of the parameter space of the MSSM-25 supersymmetric model to identify regions favored by dark matter relic density and predict event rates and likelihoods for IceCube. The goal is to interpret any neutrino signals IceCube detects in terms of supersymmetric dark matter models.
This document summarizes research on flux pinning in defect-engineered superconductors. It discusses how flux pinning is determined by a material's microstructure and how it relates to critical current density. The vortex path model is introduced, which considers the statistical population of pinned vortex paths through a sample. Pulsed laser deposited YBCO thin films are examined, showing a broad in-plane peak that results from large-scale through-thickness defects, rather than mass anisotropy. Films with Ba2YNbO6 additions are also summarized, demonstrating enhanced c-axis pinning from nanorods in the material.
This document discusses pulsating white dwarf stars and the Puoko-nui CCD Photometer instrument used to study them. It provides an overview of pulsating white dwarfs, explaining that they are slowly cooling stellar remnants that pulsate due to non-radial pulsations within their interior. The Puoko-nui instrument is described as a portable CCD photometer with a frame transfer design, located at Mount John Observatory, that is used to obtain time series photometry of pulsating white dwarfs. Light curves of target stars are generated through data reduction steps including preprocessing, aperture photometry, and Fourier analysis.
Globular clusters can be used to test theories of stellar evolution and nucleosynthesis by studying the variations in elements like carbon, nitrogen, sodium, and s-process and r-process elements within their stars. The author conducts high and medium resolution spectroscopic studies of stars in globular clusters like 47 Tucanae and Omega Centauri to infer elemental abundances and plans to extend this work to other clusters using instruments on telescopes like SALT.
The document describes the development of a new fibre optic dosimeter using fluoroperovskite materials. These materials were characterized through photoluminescence, optically stimulated luminescence, and radioluminescence studies. The dosimeter was tested at a linear accelerator and showed a linear response to radiation dose, demonstrating potential for radiation monitoring applications.
This document discusses the effect of electronic doping on the magnetic and thermoelectric properties of Ba2FeMoO6. It summarizes that electron doping does not significantly impact the antisite disorder in Ba2FeMoO6. The thermopower of Ba2FeMoO6 changes with lanthanum doping. Additionally, Ba2FeMoO6 exhibits a magnetothermopower effect.
FeSr2Y2-yCeyCu2O8+x exhibits spin glass behavior with a transition around 24K. It has a negative Curie-Weiss temperature, suggesting antiferromagnetic interactions between Fe ions. The material is likely semiconducting. FeSr2YCu2O6+x can become superconducting with a Tc of 64K but doping reduces Tc, possibly due to Fe pair breaking. It also shows antiferromagnetic interactions and an effective magnetic moment that suggests a mixture of Fe oxidation states.
The document provides a brief history of the discovery and theoretical development of white dwarf stars from 1915 to the present. It begins by discussing how white dwarfs were first identified in 1915 and the early quantum mechanical theories developed in the 1920s to explain their structure. It then summarizes several important discoveries and theoretical advances over subsequent decades, including the prediction of a maximum white dwarf mass in 1932, the discovery of the first pulsating white dwarf in 1964, and the establishment of the Whole Earth Telescope in 1990 to facilitate extended observations of pulsating white dwarfs.
1) The document analyzes cloud height data from 2000-2010 from the MISR instrument to study changes that may impact climate.
2) Global average cloud heights decreased by about 45 meters over this period, similar to the estimated effect of increased CO2 levels.
3) A major decrease in heights occurred during the strong 2007-2008 La Niña event, with offsetting changes between Indonesia and the central Pacific.
"Scaling RAG Applications to serve millions of users", Kevin GoedeckeFwdays
How we managed to grow and scale a RAG application from zero to thousands of users in 7 months. Lessons from technical challenges around managing high load for LLMs, RAGs and Vector databases.
Conversational agents, or chatbots, are increasingly used to access all sorts of services using natural language. While open-domain chatbots - like ChatGPT - can converse on any topic, task-oriented chatbots - the focus of this paper - are designed for specific tasks, like booking a flight, obtaining customer support, or setting an appointment. Like any other software, task-oriented chatbots need to be properly tested, usually by defining and executing test scenarios (i.e., sequences of user-chatbot interactions). However, there is currently a lack of methods to quantify the completeness and strength of such test scenarios, which can lead to low-quality tests, and hence to buggy chatbots.
To fill this gap, we propose adapting mutation testing (MuT) for task-oriented chatbots. To this end, we introduce a set of mutation operators that emulate faults in chatbot designs, an architecture that enables MuT on chatbots built using heterogeneous technologies, and a practical realisation as an Eclipse plugin. Moreover, we evaluate the applicability, effectiveness and efficiency of our approach on open-source chatbots, with promising results.
Session 1 - Intro to Robotic Process Automation.pdfUiPathCommunity
👉 Check out our full 'Africa Series - Automation Student Developers (EN)' page to register for the full program:
https://bit.ly/Automation_Student_Kickstart
In this session, we shall introduce you to the world of automation, the UiPath Platform, and guide you on how to install and setup UiPath Studio on your Windows PC.
📕 Detailed agenda:
What is RPA? Benefits of RPA?
RPA Applications
The UiPath End-to-End Automation Platform
UiPath Studio CE Installation and Setup
💻 Extra training through UiPath Academy:
Introduction to Automation
UiPath Business Automation Platform
Explore automation development with UiPath Studio
👉 Register here for our upcoming Session 2 on June 20: Introduction to UiPath Studio Fundamentals: https://community.uipath.com/events/details/uipath-lagos-presents-session-2-introduction-to-uipath-studio-fundamentals/
Your One-Stop Shop for Python Success: Top 10 US Python Development Providersakankshawande
Simplify your search for a reliable Python development partner! This list presents the top 10 trusted US providers offering comprehensive Python development services, ensuring your project's success from conception to completion.
Northern Engraving | Nameplate Manufacturing Process - 2024Northern Engraving
Manufacturing custom quality metal nameplates and badges involves several standard operations. Processes include sheet prep, lithography, screening, coating, punch press and inspection. All decoration is completed in the flat sheet with adhesive and tooling operations following. The possibilities for creating unique durable nameplates are endless. How will you create your brand identity? We can help!
Skybuffer SAM4U tool for SAP license adoptionTatiana Kojar
Manage and optimize your license adoption and consumption with SAM4U, an SAP free customer software asset management tool.
SAM4U, an SAP complimentary software asset management tool for customers, delivers a detailed and well-structured overview of license inventory and usage with a user-friendly interface. We offer a hosted, cost-effective, and performance-optimized SAM4U setup in the Skybuffer Cloud environment. You retain ownership of the system and data, while we manage the ABAP 7.58 infrastructure, ensuring fixed Total Cost of Ownership (TCO) and exceptional services through the SAP Fiori interface.
Discover top-tier mobile app development services, offering innovative solutions for iOS and Android. Enhance your business with custom, user-friendly mobile applications.
Essentials of Automations: Exploring Attributes & Automation ParametersSafe Software
Building automations in FME Flow can save time, money, and help businesses scale by eliminating data silos and providing data to stakeholders in real-time. One essential component to orchestrating complex automations is the use of attributes & automation parameters (both formerly known as “keys”). In fact, it’s unlikely you’ll ever build an Automation without using these components, but what exactly are they?
Attributes & automation parameters enable the automation author to pass data values from one automation component to the next. During this webinar, our FME Flow Specialists will cover leveraging the three types of these output attributes & parameters in FME Flow: Event, Custom, and Automation. As a bonus, they’ll also be making use of the Split-Merge Block functionality.
You’ll leave this webinar with a better understanding of how to maximize the potential of automations by making use of attributes & automation parameters, with the ultimate goal of setting your enterprise integration workflows up on autopilot.
Monitoring and Managing Anomaly Detection on OpenShift.pdfTosin Akinosho
Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
1. Introduction to Anomaly Detection
- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
2. Understanding Edge (IoT)
- Learn about edge computing and IoT, and how they enable real-time data processing and decision-making at the source.
3. What is ArgoCD?
- Discover ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes, and its role in deploying applications on edge devices.
4. Deployment Using ArgoCD for Edge Devices
- Step-by-step guide on deploying anomaly detection models on edge devices using ArgoCD.
5. Introduction to Apache Kafka and S3
- Explore Apache Kafka for real-time data streaming and Amazon S3 for scalable storage solutions.
6. Viewing Kafka Messages in the Data Lake
- Learn how to view and analyze Kafka messages stored in a data lake for better insights.
7. What is Prometheus?
- Get to know Prometheus, an open-source monitoring and alerting toolkit, and its application in monitoring edge devices.
8. Monitoring Application Metrics with Prometheus
- Detailed instructions on setting up Prometheus to monitor the performance and health of your anomaly detection system.
9. What is Camel K?
- Introduction to Camel K, a lightweight integration framework built on Apache Camel, designed for Kubernetes.
10. Configuring Camel K Integrations for Data Pipelines
- Learn how to configure Camel K for seamless data pipeline integrations in your anomaly detection workflow.
11. What is a Jupyter Notebook?
- Overview of Jupyter Notebooks, an open-source web application for creating and sharing documents with live code, equations, visualizations, and narrative text.
12. Jupyter Notebooks with Code Examples
- Hands-on examples and code snippets in Jupyter Notebooks to help you implement and test anomaly detection models.
What is an RPA CoE? Session 1 – CoE VisionDianaGray10
In the first session, we will review the organization's vision and how this has an impact on the COE Structure.
Topics covered:
• The role of a steering committee
• How do the organization’s priorities determine CoE Structure?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
zkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...Alex Pruden
Folding is a recent technique for building efficient recursive SNARKs. Several elegant folding protocols have been proposed, such as Nova, Supernova, Hypernova, Protostar, and others. However, all of them rely on an additively homomorphic commitment scheme based on discrete log, and are therefore not post-quantum secure. In this work we present LatticeFold, the first lattice-based folding protocol based on the Module SIS problem. This folding protocol naturally leads to an efficient recursive lattice-based SNARK and an efficient PCD scheme. LatticeFold supports folding low-degree relations, such as R1CS, as well as high-degree relations, such as CCS. The key challenge is to construct a secure folding protocol that works with the Ajtai commitment scheme. The difficulty, is ensuring that extracted witnesses are low norm through many rounds of folding. We present a novel technique using the sumcheck protocol to ensure that extracted witnesses are always low norm no matter how many rounds of folding are used. Our evaluation of the final proof system suggests that it is as performant as Hypernova, while providing post-quantum security.
Paper Link: https://eprint.iacr.org/2024/257
inQuba Webinar Mastering Customer Journey Management with Dr Graham HillLizaNolte
HERE IS YOUR WEBINAR CONTENT! 'Mastering Customer Journey Management with Dr. Graham Hill'. We hope you find the webinar recording both insightful and enjoyable.
In this webinar, we explored essential aspects of Customer Journey Management and personalization. Here’s a summary of the key insights and topics discussed:
Key Takeaways:
Understanding the Customer Journey: Dr. Hill emphasized the importance of mapping and understanding the complete customer journey to identify touchpoints and opportunities for improvement.
Personalization Strategies: We discussed how to leverage data and insights to create personalized experiences that resonate with customers.
Technology Integration: Insights were shared on how inQuba’s advanced technology can streamline customer interactions and drive operational efficiency.
AppSec PNW: Android and iOS Application Security with MobSFAjin Abraham
Mobile Security Framework - MobSF is a free and open source automated mobile application security testing environment designed to help security engineers, researchers, developers, and penetration testers to identify security vulnerabilities, malicious behaviours and privacy concerns in mobile applications using static and dynamic analysis. It supports all the popular mobile application binaries and source code formats built for Android and iOS devices. In addition to automated security assessment, it also offers an interactive testing environment to build and execute scenario based test/fuzz cases against the application.
This talk covers:
Using MobSF for static analysis of mobile applications.
Interactive dynamic security assessment of Android and iOS applications.
Solving Mobile app CTF challenges.
Reverse engineering and runtime analysis of Mobile malware.
How to shift left and integrate MobSF/mobsfscan SAST and DAST in your build pipeline.
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
5th LF Energy Power Grid Model Meet-up SlidesDanBrown980551
5th Power Grid Model Meet-up
It is with great pleasure that we extend to you an invitation to the 5th Power Grid Model Meet-up, scheduled for 6th June 2024. This event will adopt a hybrid format, allowing participants to join us either through an online Mircosoft Teams session or in person at TU/e located at Den Dolech 2, Eindhoven, Netherlands. The meet-up will be hosted by Eindhoven University of Technology (TU/e), a research university specializing in engineering science & technology.
Power Grid Model
The global energy transition is placing new and unprecedented demands on Distribution System Operators (DSOs). Alongside upgrades to grid capacity, processes such as digitization, capacity optimization, and congestion management are becoming vital for delivering reliable services.
Power Grid Model is an open source project from Linux Foundation Energy and provides a calculation engine that is increasingly essential for DSOs. It offers a standards-based foundation enabling real-time power systems analysis, simulations of electrical power grids, and sophisticated what-if analysis. In addition, it enables in-depth studies and analysis of the electrical power grid’s behavior and performance. This comprehensive model incorporates essential factors such as power generation capacity, electrical losses, voltage levels, power flows, and system stability.
Power Grid Model is currently being applied in a wide variety of use cases, including grid planning, expansion, reliability, and congestion studies. It can also help in analyzing the impact of renewable energy integration, assessing the effects of disturbances or faults, and developing strategies for grid control and optimization.
What to expect
For the upcoming meetup we are organizing, we have an exciting lineup of activities planned:
-Insightful presentations covering two practical applications of the Power Grid Model.
-An update on the latest advancements in Power Grid -Model technology during the first and second quarters of 2024.
-An interactive brainstorming session to discuss and propose new feature requests.
-An opportunity to connect with fellow Power Grid Model enthusiasts and users.
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectorsDianaGray10
Join us to learn how UiPath Apps can directly and easily interact with prebuilt connectors via Integration Service--including Salesforce, ServiceNow, Open GenAI, and more.
The best part is you can achieve this without building a custom workflow! Say goodbye to the hassle of using separate automations to call APIs. By seamlessly integrating within App Studio, you can now easily streamline your workflow, while gaining direct access to our Connector Catalog of popular applications.
We’ll discuss and demo the benefits of UiPath Apps and connectors including:
Creating a compelling user experience for any software, without the limitations of APIs.
Accelerating the app creation process, saving time and effort
Enjoying high-performance CRUD (create, read, update, delete) operations, for
seamless data management.
Speakers:
Russell Alfeche, Technology Leader, RPA at qBotic and UiPath MVP
Charlie Greenberg, host
1. Lasers at the Interface of
Chemistry and Physics
Chemistry and Physics
(Biology? Engineering?)
Cather Simpson
Department of Physics
D t t f Ph i
School of Chemical Sciences
c.simpson@auckland.ac.nz
p @
photonfactory.auckland.ac.nz
2. The Photon Factory
Using short and ultrashort laser
pulses ...
...to probe chemistry physics
to chemistry,
... to machine on the μ to nanoscale
8. The Photon Factory James Tour
& coworkers
P=P photochemistry – a new
twist on an old tale
twist on an old tale
The Photon Factory ‐ Enabling Technology
• robust, reliable source of pulsed laser light
• pulses from nano‐ to femtoseconds
• wavelengths from ultraviolet to infrared
g f f
• low to high pulse energies
9. New photoactive electronic materials
Prof. John
Protasiewicz
Transparent
Protective Film
P t ti Fil
Dr. John Payton
Light Emitting Polymer Film
Dr. Brian Alberding
Dr. Huo‐Lei Peng Dr. Nicole Dickson Protective Film
10. Expanding the toolbox
phospha-PPVs …
polymer OLEDs
photoactive polymers (photonics)
solar energy harvesting?
Prof. John
Protasiewicz
PA P
n
PPV n
n
P
PPE P
n
n
11. Photochemistry and the periodic table
“… it is rather the heavy
elements which behave
normally and not the
ll d t th
more familiar elements
of the first row”
-- W. Kutzelnigg (1984) Angew. Chem. Int. Ed. Engl. 23:272-295
12. Photochemistry and Photophysics of Diphosphenes
Mes
Mes P P Mes
M
But
But
Prof. John Protasiewicz Mes
But P P But j
Prof. Masaaki Yoshifuji
But
But
Dmp = 2,6-Mes2C6H3
Mes* = 2,4,6-tri-t-butylphenyl Urzenius E., Protasiewicz,J.D. (1996)
Main Group Chem. 1:369.
Yoshifuji, M. et al. (1981) JACS 103:4587.
13. Photochemistry and Photophysics of Diphosphenes
What excited states are involved?
What pathways between states are important?
What structural features influence photobehaviour?
P
P
Inversion
P
P
2 P P
P
Dissociative
R R
P P
P
P P P
Rotation R' R'
14. Photochemistry and Photophysics of Diphosphenes
What excited states are involved?
What pathways between states are important?
What structural features influence photobehaviour?
Quantum chemistry calculations
Density functional theory
P
CASPT2//CASSCF P
Inversion
P
P
2 P P
P
??
Dissociative
Ultrafast Spectroscopy
R R
fs-Transient Absorption
P P
impact of P
- ligands P P P
- excitation λ Rotation R' R'
- solvent
fs-Time resolved Raman
18. The Photon Factory
Using short and ultrashort laser
pulses ...
...to probe chemistry physics
to chemistry,
... to machine on the μ to nanoscale
19.
20. Current Photon Factory Group
Dr. Chuck Rohde (Physics)
Sarah Th
S h Thompson (Chemistry – PhD student)
(Ch i t t d t)
Julie Kho (Chemistry – PhD student)
Christiaan Hougaard (BSc Hons Physics)
S o s o
Simon Ashforth (BTech Physics)
( ec ys cs) Past Members
Sean Liew (BTech Physics) Laura Harvey (MSc Physics graduate)
Edward Woon Wei An (BTech Physics) Kaidi Liang (BTech Physics)
Jessica Hendy (BA Hons Anthropology) Ling Yan Pang (BTech Physics)
James Park (BSc H
J P k (BS Hons Ch i t )
Chemistry) Amy Lin (MSc. Physics)
(MSc
Josh Bradfield (Mechatronics Engineering) Emma Simpson (Physics exchange)
Center for
Fraser MacMillan (Engineering Science) Hafizah Rahim
Chemical Dynamics
Peter Hosking (Mechatronics Engineering)
g( g g)
Mona Xin Zhu (Biomedical Engineering) Current Collaborators
Hayley Ware (Mechanical Engineering) Prof. David Williams
Matthew Edmond (Engineering Science) Dr. Bryon Wright
Isaac Hamling (Engineering Science) Dr.
Dr Charles Unsworth
Geran Zhang (Biomedical Engineering) Prof. Larry Chamley
Prof. John Protasiewicz
Prof. Terry Gustafson
21. Vice Chancellor’s Strategic Development Fund
Chancellor s
Vice Chancellor's MIRE Program
Faculty of Science
School of Chemical Science & Department of
Physics
Auckland UniServices
National Science Foundation (USA) National
(USA),
Institutes of Health (USA), Department
of Education (USA)