The document summarizes research on the dynamics and structure of Janus particles under shear flow. Janus particles have two distinct hemispheres with different surface properties. The objective is to analyze how Janus particles form clusters under shear flow and design new nano-materials. A Janus potential model and multi-particle simulations are used to study cluster formation and structures like micelles, vesicles and layers at different shear rates and temperatures. Radial distribution functions are analyzed to characterize structures such as icosahedrons and tetrahedral layers.
This document summarizes research on the dynamics and structure of Janus particles under shear flow. Direct numerical simulations were used to model Janus particles, which are spheres composed of two distinct hemispheres. Simulation conditions such as shear rate, temperature, particle volume fraction, and interaction strength were varied. Initial binary simulations showed that at high shear rates or low interaction strengths, shear forces can overcome attraction and break particle pairs apart. Larger multi-particle simulations found that at low shear, flow helps break up and reform aggregates, while at high shear, clusters rapidly decay. Radial distribution functions were also analyzed to characterize particle structures under shear.
Techniques for synthesis of nanomaterials (II) shubham211
This document discusses various techniques for liquid phase synthesis and mechanical synthesis of nanomaterials. It begins by outlining five major categories of liquid phase synthesis: colloidal methods, sol-gel processing, microemulsions, hydrothermal synthesis, and the polyol method. It then describes specific methods such as colloidal precipitation, sol-gel techniques using metal alkoxide precursors, and applications of sol-gel processing for ceramics and coatings. Mechanical synthesis methods covered include high-energy milling, mechanical alloying, severe plastic deformation techniques like equal channel angular pressing and high-pressure torsion.
This document discusses applications of nanofluids in solar thermal systems. It begins by defining nanofluids as fluids containing nanometer-sized particles suspended in a base fluid such as water or ethylene glycol. Some examples of nanofluids are then provided. The document then discusses how nanofluids can improve the efficiency of solar collectors and concentrated solar power systems by enhancing heat transfer compared to conventional working fluids like water or oil. Several studies are summarized that examine the effects of varying nanoparticle properties and concentrations on collector efficiency. The document also considers the economic and environmental impacts of using nanofluids in solar thermal applications.
This document discusses zinc oxide nanoparticles and their impacts including cytotoxicity, genotoxicity, and neurotoxicity. It provides background on zinc oxide nanoparticles, including their size range and applications. It then discusses exposure routes, uptake by cells, and mechanisms of toxicity including release of zinc ions, production of reactive oxygen species, and mechanical damage. The document outlines studies on cytotoxicity, genotoxicity, and neurotoxicity of zinc oxide nanoparticles. It concludes by listing references used.
Surface Modification of Nanoparticles for Biomedical ApplicationsReset_co
Surface ligands on nanoparticles control their properties and interactions, which can be harnessed for biomedical imaging, cell targeting, and therapeutic applications.
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
The document discusses hetero junction solar cells. A hetero junction is formed between two different semiconductor materials, requiring proper lattice matching between the materials. Tandem solar cells are multi-junction hetero structure cells that can absorb a broader spectrum of solar radiation than single junction cells. They consist of multiple p-n junctions connected by tunnel diodes to maximize current collection across the different subcells.
This document summarizes research on the dynamics and structure of Janus particles under shear flow. Direct numerical simulations were used to model Janus particles, which are spheres composed of two distinct hemispheres. Simulation conditions such as shear rate, temperature, particle volume fraction, and interaction strength were varied. Initial binary simulations showed that at high shear rates or low interaction strengths, shear forces can overcome attraction and break particle pairs apart. Larger multi-particle simulations found that at low shear, flow helps break up and reform aggregates, while at high shear, clusters rapidly decay. Radial distribution functions were also analyzed to characterize particle structures under shear.
Techniques for synthesis of nanomaterials (II) shubham211
This document discusses various techniques for liquid phase synthesis and mechanical synthesis of nanomaterials. It begins by outlining five major categories of liquid phase synthesis: colloidal methods, sol-gel processing, microemulsions, hydrothermal synthesis, and the polyol method. It then describes specific methods such as colloidal precipitation, sol-gel techniques using metal alkoxide precursors, and applications of sol-gel processing for ceramics and coatings. Mechanical synthesis methods covered include high-energy milling, mechanical alloying, severe plastic deformation techniques like equal channel angular pressing and high-pressure torsion.
This document discusses applications of nanofluids in solar thermal systems. It begins by defining nanofluids as fluids containing nanometer-sized particles suspended in a base fluid such as water or ethylene glycol. Some examples of nanofluids are then provided. The document then discusses how nanofluids can improve the efficiency of solar collectors and concentrated solar power systems by enhancing heat transfer compared to conventional working fluids like water or oil. Several studies are summarized that examine the effects of varying nanoparticle properties and concentrations on collector efficiency. The document also considers the economic and environmental impacts of using nanofluids in solar thermal applications.
This document discusses zinc oxide nanoparticles and their impacts including cytotoxicity, genotoxicity, and neurotoxicity. It provides background on zinc oxide nanoparticles, including their size range and applications. It then discusses exposure routes, uptake by cells, and mechanisms of toxicity including release of zinc ions, production of reactive oxygen species, and mechanical damage. The document outlines studies on cytotoxicity, genotoxicity, and neurotoxicity of zinc oxide nanoparticles. It concludes by listing references used.
Surface Modification of Nanoparticles for Biomedical ApplicationsReset_co
Surface ligands on nanoparticles control their properties and interactions, which can be harnessed for biomedical imaging, cell targeting, and therapeutic applications.
The following presentation is only for quick reference. I would advise you to read the theoretical aspects of the respective topic and then use this presentation for your last minute revision. I hope it helps you..!!
Mayur D. Chauhan
The document discusses hetero junction solar cells. A hetero junction is formed between two different semiconductor materials, requiring proper lattice matching between the materials. Tandem solar cells are multi-junction hetero structure cells that can absorb a broader spectrum of solar radiation than single junction cells. They consist of multiple p-n junctions connected by tunnel diodes to maximize current collection across the different subcells.
This document describes the synthesis of silver nanoparticles using Tollens' reagent. Silver nanoparticles between 5-50nm were produced by reducing Tollens' reagent with formaldehyde in the presence of sodium citrate at room temperature. The nanoparticles were characterized using UV-VIS spectroscopy, SEM, TEM, HRTEM and SAED. Potential applications of the silver nanoparticles include water purification, catalysis, and biomedicine due to their antimicrobial properties.
This document discusses ZnO nanostructures and their applications in nano-LEDs and nano-generators. It first provides background on ZnO, including its properties and common forms. It then describes the principles and synthesis methods of flexible nano-LEDs and piezoelectric nano-generators based on ZnO nanowires. Potential applications of these ZnO nanostructure devices include lighting, self-powered nanosystems, portable electronics and alternative energy.
This document provides an overview of nanocomposite materials. It defines nanocomposites as materials with at least one component that has dimensions between 1-100 nm. Nanocomposites consist of inorganic or organic nanoparticles embedded in a matrix. They exhibit enhanced and unique properties compared to bulk materials due to quantum effects and high surface area. The document discusses various synthesis methods for nanomaterials and nanocomposites, as well as their advantages and limitations.
Synthesis and characterization of pure zinc oxide nanoparticles and nickel do...eSAT Journals
Abstract In this paper, Zinc oxide nanoparticles are synthesized by simple wet chemical precipitation method. Zinc nitrate and sodium hydroxide are used as the starting materials.Zinc oxide nanoparticles are formed at a very low temperature of the order of 800C. Nickel doped zinc oxide nanoparticles are synthesized in two steps. In first step precipitate is obtained by reduction of mixture of zinc nitrate, ferric nitrate and starch by sodium hydroxide solution while in second step the given precipitate is thermally decomposed at high temperature of the order of 4000C. The crystallinity of the synthesized nanoparticles is then confirmed by X ray diffraction spectroscopy (XRD).The elemental composition of the powder is detected by Energy Dispersive X ray spectroscopy (EDAX). The morphology of the powder is investigated by Scanning Electron Microscopy (SEM). Magnetic characterization of nickel doped zinc oxide nanoparticles is done by Squid Magnetometer. Low temperature magnetization behavior revealed ferromagnetic behavior of sample. Key Words: Zinc oxide nanoparticles, Nickel doped ZnO, Antibacterial activity, Squid magnetometer, SEM
Since the Nobel prize for Physics was awarded to Andre Geim and Konstantin Novoselov “for groundbreaking experiments regarding the two-dimensional material graphene”, the eyes of the scientific world have been focused on this so-called miracle material.
Ferrofluids are stable liquid solutions containing magnetic nanoparticles that become strongly magnetized in the presence of a magnetic field. They were invented in 1963 by NASA scientist Steve Papell to create rocket fuel that could be pumped in zero gravity. Ferrofluids have applications in precision engineering, drug delivery, hyperthermia cancer treatment, and body armor. They can be used to transport drugs to target areas or generate heat for cancer treatment when exposed to magnetic fields. New body armor using ferrofluids in hollow fibers could act as an artificial splint. Ferrofluids also have potential applications in areas like lubrication and speakers due to their magnetic and thermal properties.
This document discusses various types of crystal imperfections or defects that can arise in solid materials. It describes point defects like vacancies, interstitial atoms, and impurity atoms. It also discusses line defects called dislocations, including edge and screw dislocations. Surface or planar defects discussed include stacking faults, grain boundaries, and twins. The document provides illustrations and explanations of each type of defect and how they can impact the structure and properties of materials.
1. The document discusses nanoparticles, which are particles between 1-100 nanometers in size. Their properties can differ from bulk materials due to their large surface area to volume ratio.
2. Nanoparticles are synthesized through various methods like sol-gel processing, ion implantation, and thermal plasma techniques. Their applications include medicine, manufacturing, materials, and the environment.
3. The document provides examples of how nanoparticles are used in medicine for targeted drug delivery, vaccines, and cancer treatment. Their use in manufacturing includes strengthening materials, protective coatings, and antibacterial fabrics. Environmental applications involve oil spill cleanup and water purification.
know more about nanomaterials and its apllication in future as well as current situation, and what wil we reserch on basis of nanomaterials and carbon structure and its aplication in such futuriastic manner.
With the increasing researches in the field of nanotechnology, various nanoparticles have become a source of interest among the nano technologists because of their great properties, like the optical properties of Cadmium Sulfide Nanoparticles are amazing and also easy to synthesize, but to make sure its quality it is equally essential to make out characterize it, this file will do the same in a lucid way!!
A convenient method of synthesizing Silver Nanoparticles form Bonatea steudneri leave extract and evaluation of their electrocatalytic and phenol removal properties.
This document discusses nanomaterials and nanotechnology. It defines nanomaterials as materials with structured components less than 100nm in at least one dimension. It describes four main types of nanomaterials: carbon-based, metal-based, dendrimers, and composites. The properties of nanoparticles differ from bulk materials due to their high surface area to volume ratio and quantum confinement effects. Nanoparticles are synthesized using top-down or bottom-up approaches such as sol-gel methods, chemical vapor deposition, and pulsed laser deposition. Nanotechnology has applications in areas like energy, electronics, medicine, and consumer goods.
This document provides information about nanosturctures and nanomaterials over three lecture sessions. It defines nanomaterials as materials with dimensions between 100 nm and 0.1 nm. It discusses various types of nanomaterials including metals, ceramics, polymers, and composites. The document also describes different classes of nanomaterials and examples of nanostructured materials from various companies. Methods for fabricating nanomaterials using top-down and bottom-up approaches are outlined, including lithography, etching, self-assembly, and chemical synthesis. Specific examples of nanofabrication techniques such as atomic manipulation, chemical vapor deposition, and plasma sputtering are also mentioned.
This document discusses magnetic fluids and their properties. It introduces magnetic nanomaterials and magnetic colloids or ferrofluids, which are liquid suspensions of magnetic nanoparticles. Ferrofluids have properties that can be controlled by external magnetic fields. They are made up of magnetic particles dispersed in a carrier fluid with surfactants to prevent clumping. There are two main types: surfacted ferrofluids using molecules like oleic acid and ionic ferrofluids using electrically charged ferrite particles. Magnetic fluids have a variety of applications including in electronics, medicine, seat suspensions, and robotics due to their controllable properties in magnetic fields.
Nanotechnology has to potential to revolutionize the US energy system. From fuel cells, to cell phone batteries, to space equipment, and everywhere in between nanotechnology can be utilized.
But, there is still a lot of research to be done and many hurdles to cross to make this technology commercially practicable.
Nanoparticles are particles between 1 and 100 nanometres in size with a surrounding interfacial layer. The interfacial layer is an integral part of nanoscale matter, fundamentally affecting all of its properties. The interfacial layer typically consists of ions, inorganic and organic molecules.
This document discusses gallium arsenide (GaAs), including its history, properties, manufacturing processes, applications, and cost. GaAs is a compound of gallium and arsenic atoms arranged in a cubic lattice. It has excellent electronic properties such as high electron mobility and saturated velocity. Its direct bandgap allows efficient light emission, making it useful for solar cells and optoelectronics. GaAs is manufactured through processes like Czochralski growth and epitaxy to produce wafers for devices. Though expensive, GaAs has applications in areas like wireless communication, satellites, and solar energy due to its high performance capabilities.
Chemical Vapour Deposition is a Chemical Synthesis route of Nanomaterials. Specially thin films like Graphene and Carbon NanoTubes are grown by this method.
Powder diffraction study of zeolitic imidazolate framework-8Owen Gledhill
This document summarizes a study using powder X-ray diffraction to characterize Zeolitic Imidazolate Framework-8 (ZIF-8) synthesized through different methods. ZIF-8 was synthesized using dimethylformamide, aqueous, and ethanol/acetone methods. The dimethylformamide method produced the most crystalline and pure sample with the correct cubic structure and lattice parameter. Gas adsorption experiments showed CO2 was adsorbed into the pores of ZIF-8. Further characterization of ZIF-8 synthesized through different methods using gas adsorption and powder X-ray diffraction is planned.
This technical seminar presentation discusses nanofluids, which are fluids containing nanometer-sized particles that can alter the heat transfer properties of base fluids. The document outlines various preparation methods for nanofluids, materials used, factors that influence thermal conductivity, advantages and limitations. It also discusses applications in electronics, transportation, industrial cooling and more. Nanofluids show potential as next-generation heat transfer fluids due to characteristics like higher thermal conductivity compared to conventional fluids.
This document describes the synthesis of silver nanoparticles using Tollens' reagent. Silver nanoparticles between 5-50nm were produced by reducing Tollens' reagent with formaldehyde in the presence of sodium citrate at room temperature. The nanoparticles were characterized using UV-VIS spectroscopy, SEM, TEM, HRTEM and SAED. Potential applications of the silver nanoparticles include water purification, catalysis, and biomedicine due to their antimicrobial properties.
This document discusses ZnO nanostructures and their applications in nano-LEDs and nano-generators. It first provides background on ZnO, including its properties and common forms. It then describes the principles and synthesis methods of flexible nano-LEDs and piezoelectric nano-generators based on ZnO nanowires. Potential applications of these ZnO nanostructure devices include lighting, self-powered nanosystems, portable electronics and alternative energy.
This document provides an overview of nanocomposite materials. It defines nanocomposites as materials with at least one component that has dimensions between 1-100 nm. Nanocomposites consist of inorganic or organic nanoparticles embedded in a matrix. They exhibit enhanced and unique properties compared to bulk materials due to quantum effects and high surface area. The document discusses various synthesis methods for nanomaterials and nanocomposites, as well as their advantages and limitations.
Synthesis and characterization of pure zinc oxide nanoparticles and nickel do...eSAT Journals
Abstract In this paper, Zinc oxide nanoparticles are synthesized by simple wet chemical precipitation method. Zinc nitrate and sodium hydroxide are used as the starting materials.Zinc oxide nanoparticles are formed at a very low temperature of the order of 800C. Nickel doped zinc oxide nanoparticles are synthesized in two steps. In first step precipitate is obtained by reduction of mixture of zinc nitrate, ferric nitrate and starch by sodium hydroxide solution while in second step the given precipitate is thermally decomposed at high temperature of the order of 4000C. The crystallinity of the synthesized nanoparticles is then confirmed by X ray diffraction spectroscopy (XRD).The elemental composition of the powder is detected by Energy Dispersive X ray spectroscopy (EDAX). The morphology of the powder is investigated by Scanning Electron Microscopy (SEM). Magnetic characterization of nickel doped zinc oxide nanoparticles is done by Squid Magnetometer. Low temperature magnetization behavior revealed ferromagnetic behavior of sample. Key Words: Zinc oxide nanoparticles, Nickel doped ZnO, Antibacterial activity, Squid magnetometer, SEM
Since the Nobel prize for Physics was awarded to Andre Geim and Konstantin Novoselov “for groundbreaking experiments regarding the two-dimensional material graphene”, the eyes of the scientific world have been focused on this so-called miracle material.
Ferrofluids are stable liquid solutions containing magnetic nanoparticles that become strongly magnetized in the presence of a magnetic field. They were invented in 1963 by NASA scientist Steve Papell to create rocket fuel that could be pumped in zero gravity. Ferrofluids have applications in precision engineering, drug delivery, hyperthermia cancer treatment, and body armor. They can be used to transport drugs to target areas or generate heat for cancer treatment when exposed to magnetic fields. New body armor using ferrofluids in hollow fibers could act as an artificial splint. Ferrofluids also have potential applications in areas like lubrication and speakers due to their magnetic and thermal properties.
This document discusses various types of crystal imperfections or defects that can arise in solid materials. It describes point defects like vacancies, interstitial atoms, and impurity atoms. It also discusses line defects called dislocations, including edge and screw dislocations. Surface or planar defects discussed include stacking faults, grain boundaries, and twins. The document provides illustrations and explanations of each type of defect and how they can impact the structure and properties of materials.
1. The document discusses nanoparticles, which are particles between 1-100 nanometers in size. Their properties can differ from bulk materials due to their large surface area to volume ratio.
2. Nanoparticles are synthesized through various methods like sol-gel processing, ion implantation, and thermal plasma techniques. Their applications include medicine, manufacturing, materials, and the environment.
3. The document provides examples of how nanoparticles are used in medicine for targeted drug delivery, vaccines, and cancer treatment. Their use in manufacturing includes strengthening materials, protective coatings, and antibacterial fabrics. Environmental applications involve oil spill cleanup and water purification.
know more about nanomaterials and its apllication in future as well as current situation, and what wil we reserch on basis of nanomaterials and carbon structure and its aplication in such futuriastic manner.
With the increasing researches in the field of nanotechnology, various nanoparticles have become a source of interest among the nano technologists because of their great properties, like the optical properties of Cadmium Sulfide Nanoparticles are amazing and also easy to synthesize, but to make sure its quality it is equally essential to make out characterize it, this file will do the same in a lucid way!!
A convenient method of synthesizing Silver Nanoparticles form Bonatea steudneri leave extract and evaluation of their electrocatalytic and phenol removal properties.
This document discusses nanomaterials and nanotechnology. It defines nanomaterials as materials with structured components less than 100nm in at least one dimension. It describes four main types of nanomaterials: carbon-based, metal-based, dendrimers, and composites. The properties of nanoparticles differ from bulk materials due to their high surface area to volume ratio and quantum confinement effects. Nanoparticles are synthesized using top-down or bottom-up approaches such as sol-gel methods, chemical vapor deposition, and pulsed laser deposition. Nanotechnology has applications in areas like energy, electronics, medicine, and consumer goods.
This document provides information about nanosturctures and nanomaterials over three lecture sessions. It defines nanomaterials as materials with dimensions between 100 nm and 0.1 nm. It discusses various types of nanomaterials including metals, ceramics, polymers, and composites. The document also describes different classes of nanomaterials and examples of nanostructured materials from various companies. Methods for fabricating nanomaterials using top-down and bottom-up approaches are outlined, including lithography, etching, self-assembly, and chemical synthesis. Specific examples of nanofabrication techniques such as atomic manipulation, chemical vapor deposition, and plasma sputtering are also mentioned.
This document discusses magnetic fluids and their properties. It introduces magnetic nanomaterials and magnetic colloids or ferrofluids, which are liquid suspensions of magnetic nanoparticles. Ferrofluids have properties that can be controlled by external magnetic fields. They are made up of magnetic particles dispersed in a carrier fluid with surfactants to prevent clumping. There are two main types: surfacted ferrofluids using molecules like oleic acid and ionic ferrofluids using electrically charged ferrite particles. Magnetic fluids have a variety of applications including in electronics, medicine, seat suspensions, and robotics due to their controllable properties in magnetic fields.
Nanotechnology has to potential to revolutionize the US energy system. From fuel cells, to cell phone batteries, to space equipment, and everywhere in between nanotechnology can be utilized.
But, there is still a lot of research to be done and many hurdles to cross to make this technology commercially practicable.
Nanoparticles are particles between 1 and 100 nanometres in size with a surrounding interfacial layer. The interfacial layer is an integral part of nanoscale matter, fundamentally affecting all of its properties. The interfacial layer typically consists of ions, inorganic and organic molecules.
This document discusses gallium arsenide (GaAs), including its history, properties, manufacturing processes, applications, and cost. GaAs is a compound of gallium and arsenic atoms arranged in a cubic lattice. It has excellent electronic properties such as high electron mobility and saturated velocity. Its direct bandgap allows efficient light emission, making it useful for solar cells and optoelectronics. GaAs is manufactured through processes like Czochralski growth and epitaxy to produce wafers for devices. Though expensive, GaAs has applications in areas like wireless communication, satellites, and solar energy due to its high performance capabilities.
Chemical Vapour Deposition is a Chemical Synthesis route of Nanomaterials. Specially thin films like Graphene and Carbon NanoTubes are grown by this method.
Powder diffraction study of zeolitic imidazolate framework-8Owen Gledhill
This document summarizes a study using powder X-ray diffraction to characterize Zeolitic Imidazolate Framework-8 (ZIF-8) synthesized through different methods. ZIF-8 was synthesized using dimethylformamide, aqueous, and ethanol/acetone methods. The dimethylformamide method produced the most crystalline and pure sample with the correct cubic structure and lattice parameter. Gas adsorption experiments showed CO2 was adsorbed into the pores of ZIF-8. Further characterization of ZIF-8 synthesized through different methods using gas adsorption and powder X-ray diffraction is planned.
This technical seminar presentation discusses nanofluids, which are fluids containing nanometer-sized particles that can alter the heat transfer properties of base fluids. The document outlines various preparation methods for nanofluids, materials used, factors that influence thermal conductivity, advantages and limitations. It also discusses applications in electronics, transportation, industrial cooling and more. Nanofluids show potential as next-generation heat transfer fluids due to characteristics like higher thermal conductivity compared to conventional fluids.
Patricia Rubnich has over 15 years of experience in business services and human resources management. She has held roles such as Business Service Manager, Assistant Business Manager, and Business Specialist. Her responsibilities have included managing payroll, accounting, budgets, and ensuring compliance. She is skilled in areas such as accounting, HR management, and Microsoft software.
The most awaited ICT event of Nepal - CAN Infotech organized by Computer Association of Nepal is being held from 2-7 January this year (2014). The official SMS partner of this exhibition is Sparrow SMS
fecha de creación: 12-Diciembre-2016.
Creador: Erick Quezada.
Centro de Estudio: Universidad Técnica Particular de Loja.
Periodo: Octubre 2016-Febrero 2017.
Titulación: Ingeniería Civil.
Materia: Computación.
LEEM is a product that provides real-time carbon emissions data specific to a business or municipality's energy consumption. This allows energy management systems to accurately manage carbon footprints. LEEM produces a data stream of emissions that is licensed to users. It will allow energy management companies to charge more for their services and building owners to charge more in rent. The company is seeking funding to sign up trial customers and develop a secure interface for the LEEM data stream.
The Ugly Truth about Plastic Water BottlesInfruition
Infruition investigated why plastic water bottles have got such a bad reputation. From how expensive they are (we spend on average £25k on them in our lifetime!) to the damning impact they have on the environment. Think along the lines of Cowspiracy.
Este documento é um edital de concurso público para delegado de polícia civil no estado do Pará. O edital contém instruções sobre a prova, como a duração de 5 horas e 80 questões de múltipla escolha. Também lista as disciplinas cobradas na prova e o valor de cada questão.
Trắc nghiệm Lịch sử Đảng cộng sản Việt Namvietlod.com
Gần 300 câu trắc nghiệm môn Lịch sử Đảng cộng sản Việt Nam (có đầy đủ đáp án). Các câu trắc nghiệm đã được kiểm duyệt nhiều lần, cả về nội dung lẫn hình thức trình bày (lỗi chính tả, dấu câu...) và được đánh mã số câu hỏi rất phù hợp cho nhu cầu tự học, cũng như sưu tầm. Các bạn có thể tải về tại http://vietlod.com/quiz/
1) The document analyzes the structural relaxation of the electrical double layer in ionic liquids with and without the addition of Li salts using AC impedance and electrochemical surface plasmon resonance (ESPR) techniques.
2) For systems with the same anion, the addition of Li salts caused a decrease in capacitance but did not significantly change the liquid resistance or relaxation times. For different anion systems, the addition of Li salts led to a large decrease in capacitance and asymmetric relaxation times.
3) The results suggest that Li salts form complex anions that decelerate relaxation in the electrical double layer. For different anion systems, the complex anions slowly form a dense interfacial structure during the positive
【DL輪読会】NeRF-VAE: A Geometry Aware 3D Scene Generative ModelDeep Learning JP
NeRF-VAE is a 3D scene generative model that combines Neural Radiance Fields (NeRF) and Generative Query Networks (GQN) with a variational autoencoder (VAE). It uses a NeRF decoder to generate novel views conditioned on a latent code. An encoder extracts latent codes from input views. During training, it maximizes the evidence lower bound to learn the latent space of scenes and allow for novel view synthesis. NeRF-VAE aims to generate photorealistic novel views of scenes by leveraging NeRF's view synthesis abilities within a generative model framework.
Polynomial matrices can help to elegantly formulate many broadband multi-sensor / multi-channel processing problems, and represent a direct extension of well-established narrowband techniques which typically involve eigen- (EVD) and singular value decompositions (SVD) for optimisation. Polynomial matrix decompositions extend the utility of the EVD to polynomial parahermitian matrices, and this talk presents a brief overview of such polynomial matrices, characteristics of the polynomial EVD (PEVD) and iterative algorithms for its solution. The presentation concludes with some surprising results when applying the PEVD to subband coding and broadband beamforming.
Shear reversal simulations of a dense glass -forming supercooled colloidal melt: Rheology, microstructure and puzzles. Using non-equilibrium MD technique in nano to micro meter lengthscale and microsecond timescale, we show how "Bauschinger effect" can be realized in dense colloids.
The document summarizes a presentation on minimizing tensor estimation error using alternating minimization. It begins with an introduction to tensor decompositions including CP, Tucker, and tensor train decompositions. It then discusses nonparametric tensor estimation using an alternating minimization method. The method iteratively updates components while holding other components fixed, achieving efficient computation. The analysis shows that after t iterations, the estimation error is bounded by the sum of a statistical error term and an optimization error term decaying exponentially in t. Real data analysis uses the method for multitask learning.
In this paper we have established the bounds of the extreme characteristic roots of nlap G and sLap G by their traces. Also found the bounds for n th characteristic roots of nLap G and sLap G . M M Jariya "Results on Characteristic Vectors" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd28006.pdf Paper URL: https://www.ijtsrd.com/mathemetics/other/28006/results-on-characteristic-vectors/m-m-jariya
1. The document analyzes the transcendental equation with five unknowns represented by 5222 224 22 )1( Rkwzyx n .
2. Two methods of analysis are presented to obtain non-zero distinct integral solutions to the equation. The first method involves substitutions that represent the solutions in terms of polynomials involving A and B.
3. The second method uses different substitutions to represent the solutions in terms of polynomials involving m and n, providing a different pattern of solutions. Properties of the solutions are also outlined.
The document discusses the finite element method for analyzing 3D solid structures. It describes the tetrahedron element, including its shape functions, strain matrix, and element matrices. It also briefly mentions the hexahedron element and higher order elements with curved surfaces. The key aspects covered are the derivation of shape functions for the tetrahedron element based on volume coordinates, the calculation of the strain matrix and element matrices, and two methods for evaluating the element matrices.
NITheP WITS node Seminar by Dr Dr. Roland Cristopher F. Caballar (NITheP/UKZN)
TITLE: "One-Dimensional Homogeneous Open Quantum Walks"
ABSTRACT: In this talk, we consider a system undergoing an open quantum walk on a one-dimensional lattice. Each jump of the system between adjacent lattice points in a given direction corresponds to a jump operator, with these jump operators either commuting or not commuting. We examine the dynamics of the system undergoing this open quantum walk, in particular deriving analytically the probability distribution of the system, as well as examining numerically the behavior of the probability distribution over long time steps. The resulting distribution is shown to have multiple components, which fall under two general categories, namely normal and solitonic components. The analytic computation of the probability distribution for the system undergoing this open quantum walk allows us to determine at any instant of time the dynamical properties of the system.
WE4.L09 - MEAN-SHIFT AND HIERARCHICAL CLUSTERING FOR TEXTURED POLARIMETRIC SA...grssieee
The document describes techniques for segmenting and classifying polarimetric synthetic aperture radar (PolSAR) images using mean-shift clustering and hierarchical clustering. It discusses (1) using mean-shift clustering to group segmented regions based on radiometric and textural attributes, (2) measuring distances between clusters using maximum likelihood estimates, and (3) performing hierarchical clustering by sequentially merging the closest clusters to minimize decreases in maximum log-likelihood. The techniques were able to effectively segment multi-looked PolSAR images into meaningful groups and classes.
ESL 4.4.3-4.5: Logistic Reression (contd.) and Separating HyperplaneShinichi Tamura
The presentation material for the reading club of Element of Statistical Learning by Hastie et al.
The contents of the sections cover
- Properties of logistic regression compared to least square s fitting
- Difference between logistic regression vs. linear discriminant analysis
- Rosenblatt's perceptron algorithm
- Derivation of optimal hyperplane, which offers the basis for SVM
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研究室での『統計学習の基礎』(Hastieら著)の輪講用発表資料(ぜんぶ英語)です。
担当範囲は
・最小二乗法との類推で見るロジスティック回帰の特徴
・ロジスティック回帰と線形判別分析の比較
・ローゼンブラットのパーセプトロンアルゴリズム
・SVMの基礎となる最適分離超平面の導出
The Analytical Nature of the Greens Function in the Vicinity of a Simple Poleijtsrd
It is known that the Green function of a boundary value problem is a meromorphic function of a spectral parameter. When the boundary conditions contain integro differential terms, then the meromorphism of the Greens function of such a problem can also be proved. In this case, it is possible to write out the structure of the residue at the singular points of the Greens function of the boundary value problem with integro differential perturbations. An analysis of the structure of the residue allows us to state that the corresponding functions of the original operator are sufficiently smooth functions. Surprisingly, the adjoint operator can have non smooth eigenfunctions. The degree of non smoothness of the eigenfunction of the adjoint operator to an operator with integro differential boundary conditions is clarified. It is indicated that even those conjugations to multipoint boundary value problems have non smooth eigenfunctions. Ghulam Hazrat Aimal Rasa "The Analytical Nature of the Green's Function in the Vicinity of a Simple Pole" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33696.pdf Paper Url: https://www.ijtsrd.com/mathemetics/applied-mathamatics/33696/the-analytical-nature-of-the-greens-function-in-the-vicinity-of-a-simple-pole/ghulam-hazrat-aimal-rasa
Dual Gravitons in AdS4/CFT3 and the Holographic Cotton TensorSebastian De Haro
This document summarizes research on dual gravitons in AdS4/CFT3 and the holographic Cotton tensor. Key points:
- In AdS4/CFT3, both modes of the graviton are normalizable, allowing duality to interchange the boundary metric g(0) and stress tensor T.
- The Cotton tensor C, which maps a metric to its stress tensor, plays a special role as the "holographic Cotton tensor".
- There is a duality symmetry of the bulk equations of motion under which the linearized metric fluctuations ḣ and Cotton tensor of the dual metric C(ḣ) are interchanged.
- This relates the
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Dynamics and Structure of Janus Particles
1. Dynamics and Structure of
Janus Particles
B4 Okura Tatsuya
Department of Chemical Engineering
Transport Phenomena Lab.
2. Introduction
Applications
Objective
What is a Janus particle?
1
• two symmetric hemispheres
characterized by different surface properties
• form a variety of clusters
such as micelles, vesicles or layers
analyze the process of cluster forming under shear flow
• design of future nano-materials
[1] Soft Matter, 2015.11, 3767-3771
[1]
• drug delivery
• emulsion stabilizers
[2] https://www.google.co.jp/search?q=cell+targeting
[2]
4. Multi-particle Simulation
Previous Research
[1] Soft Matter, 2015.11, 3767-3771
3
<M>
E /N
: Average cluster size
: Shear rate
: Energy per particle
High
Low
breakup and reform
unstable clusters
destroy clusters:
:
rij
iqˆ
jqˆ
Binary Simulation
5. Simulation Method
ii VR
other
i
H
iiiM FFV
H
iii NΩI
0 fu
pfftf fp )( σIuu
Smoothed Profile Method
a
: Particle radius
: Interface width
: Interface function
Fundamental Equations
Particles
Host fluid
4
R. Yamamoto et al., Phys. Rev. E, 71, 036707 (2005)
Newton – Euler equations
Navier – Stokes equation
6. 5
Results 1
• Phase diagram of pair stability connected
separated
C
C
:
:
:
:
D4
2
5
10-2
10-2
3
)2/,2/( Lu
connected
separated
C
1
3
5
7
òòòò òò
10-4 10-3 10-2 10-1
Pe
0.05 0.5 5 50
òòòò òò
kBT =13
Tk
D B
D
uL
Pe
7. 6
Results 2
C / kBT = 50C / kBT = 5
f = 0.01 = 0.01
high temperature low temperature
8. 7
N = 13
icosahedron
Structure
• Narrow peak of N=13
• Various cluster size
between N=6 and N=12
[1] Soft Matter, 2015.11, 3767-3771
when
conditions
C / kBT = 0.1
Pe = 50
f = 0.01
9. Numerical analysis of the Structure
8
• Radial distribution function
Rosenthal , Gubbins , and K lapp JCP, 136, 174901 (2012)
g r( )=
V
4pr2
N2
d r -rij( )
j¹i
å
i
å
gp r( )=
V
4pr2
N2
d r -rij( ) ˆqi × ˆqj
j¹i
å
i
å
ga r( )=
V
4pr2
N2
d r -rij( ) ˆqi × ˆrij
j¹i
å
i
å
rg
rijiqˆ jqˆ
rij
iqˆ jqˆ
gp r( )> 0
gp r( )< 0
ga r( )> 0
ga r( )< 0
peak
peak
peak
peak
g r( )®1
r ®¥
tail-to-tail
head-to-head
rgparallel
rg elantiparall
10. 9
gp r( )=
V
4pr2
N2
d r-rij( ) ˆqi × ˆqj
j¹i
å
i
å ga r( )=
V
4pr2
N2
d r-rij( ) ˆqi × ˆrij
j¹i
å
i
å
0rga
0rga
peak
peak
0rgp
0rgp
peak
peak
/r/r
Numerical analysis of the Structure
g r( )=
V
4pr2
N2
d r -rij( )
j¹i
å
i
å
/r
N = 13icosahedron
ga(r)
gp(r)
g(r)
19. 18
gp r( )=
V
4pr2
N2
d r-rij( ) ˆqi × ˆqj
j¹i
å
i
å ga r( )=
V
4pr2
N2
d r-rij( ) ˆqi × ˆrij
j¹i
å
i
å
0rga
0rga
peak
peak
0rgp
0rgp
peak
peak
/r/r
Numerical analysis of the Structure
g r( )=
V
4pr2
N2
d r -rij( )
j¹i
å
i
å
/r
ga(r)
gp(r)
g(r)
gyro
≃ 0.3f
0
20. 19
rijiqˆ jqˆ
Numerical analysis of Structure
i ij
ijiija rr
Nr
V
rg rq ˆˆ
4 22
/r
i ij
jiijp rr
Nr
V
rg qq ˆˆ
4 22
/r
tetra-layers
ga(r)
gp(r)
0rgp
0rgp
peak
peak
0rga
0rga
peak
peak
g(r)
g r( )=
V
4pr2
N2
d r -rij( )
j¹i
å
i
å
≃ 0.3f
02.0
21. 20
Appendix
• Compare zigzag with Lees Edwards
• Add terms of potential energy to the Janus potential model
x
y
zigzag Lees Edwards
x
y
artificial
• Cluster size analysis with algorithm
Rosenthal , Gubbins , and K lapp JCP, 136, 174901 (2012)
22. 21N = 13icosahedron
Pe=50 ,Φ=0.01 , C=5
(a)
i ij
ijrr
Nr
V
rg
22000
4
Ste
/r
rg000
Numerical analysis of the Structure
time
E/N
23. 22
Simulation Conditions 1
box size : 64×64×64
x
y
zigzag
time step : 100×300
2Re
uD
),1,1( u
initial orientation : tail to
tail
Binary simulation
: 10-4 ~ 10-2
: 6
: 1
TkB
Re : 0.036 ~ 0.36
3
ijij
ijr
σijrλCσ
jiijjanusU rqqq,q,r
ˆˆ
2
exp
ˆˆ
where
C : interaction strength
: range of the anisotropic interaction
: diameter
24. 23
Simulation Conditions 2
box size : 128×128×128
: 0.01
: 6
: 0.1 ~1
3
TkB
ijij
ijr
σijrλCσ
jiijjanusU rqqq,q,r
ˆˆ
2
exp
ˆˆ
where
time step : 300×500
2Re
uD
),1,1( u
Re : 0.036 ~ 0.36
Multi-particle simulation
Initial distribution: uniform random
Lees Edwards
x
y
C : interaction strength
: range of the anisotropic interaction
: diameter
Thank you for coming to my presentation.
Today, I will talk about Dynamical properties and Structure of Janus Particles dispersions.
To begin with, I’m going to give you a feeling of what a Janus particle looks like. As you can see in this figure, a Janus particle has two symmetric hemispheres, characterized by different surface properties. According to the surface characteristics, these particles can form a variety of clusters such as micelles, vesicles, or layers. Such a system can be useful for the design of nano-materials which have potential applications as drug delivery systems or emulsion stabilizers.In this research, I focus on the process of cluster forming under shear flow.
First, I’m going to explain how the model is constructed. This is one of the simplest Janus particle models.
It’s a sphere where one half is covered with an attractive patch and the other one( is covered with) a repulsive patch.
I call the blue part the tail and orange one the head.
The Potential Energy is described as a sum of Urepulsion and Ujanus.
r is the distance between particles, and normalized vector q denotes the orientation of the particle.
Urepulsion includes an isotropic contribution. I adopted a truncated LJ potential to avoid overlapping of the particles.
On the other hand, UJanus includes an anisotropic contribution, which depends not only on the distance but also on the orientation.
where σ is the diameter and the parameters C and λ denote the interaction strength and range, respectively.The upper figure shows the Janus pair potential model for four distinct configurations. In this model, tail to tail is the most stable configuration.
Previous research has studied what happens to these Janus particles under shear.(a) consider two particles which are in a tail-to-tail configuration.(b) If add the shear, it makes a particle move and rotate.
(c) At one point, when the shear is strong enough, the pairs are not stable.
So why shear flow? why is it important to apply shear?
Multi-particle simulations suggest that at low shear rate, shear can help to breakup and reform aggregates which have energetically unfavorable configurations. Furthermore, shear flow increases the mobility of the dispersed particles and this improves the probability of merging free particles and unstable aggregates. However, this process cannot be sustained indefinitely, and clusters rapidly decay when shear rate is increased further.
In order to investigate the behavior of Janus particles, I applied direct numerical simulations to spherical particles immersed in a host fluid, using the smoothed profile method.The motion of the particles is calculated by the Newton-Euler equations. The dynamic of the fluid is described by the Navier-Stokes equation.
(From now, I am going to show you some simulation results.)
At first, I conducted some simulations with two particles.This phase diagram shows the stability of a pair as a function of interaction strength and shear rate.
I put two particles with tail to tail configuration at the center of the system. Then I added the shear.
Here, I will show you two movies at different states.
Two particles are moving and rotating, but they’re still stable.
when hydrodynamic force affects two particles more than Janus attraction , they cannot keep the tail to tail configuration.
Next, I conducted multi-particle simulations.
Let me show you the comparison among two temperatures at low volume fraction.
At high temperature you can see a lot of free particles and a few clusters because of the fluctuation of the particles.
On the other hand, at low temperature, you can see more stable aggregates.
We can also say that the lower temperature has a big influence on the process of making up the stable clusters.
When I look at the detail of the structure, I observed micelles such as icosahedrons composed of 13 particles,
including a single particle as the cluster center, at low volume fraction and low temperature.
This behavior has been already reported in the literature.
In order to identify the structure, I employed radial distribution function, defined here.
g(r) counts the number of neighboring particles in a shell with distance r from a center particle.
But just standard g of r is not enough because Janus particles have the orientation.
So, I introduced extra g of r to get more detailed information.
They can help me to distinguish the configuration.
Gparallel , if positive, will give me parallel orientations.
Gantiparallel, if positive, will give me antiparallel orientations. Specifically, positive values indicate tail to tail configuration.
I calculated three g of r.
Then, I got three peak positions almost corresponding to an ideal icosahedron, described as dotted line.
In this sense, my data confirms the icosahedral structure indicated by the snapshot.
More interestingly, at higher volume fraction (φ = 0.2), I observed larger micelles than icosahedrons even at high temperature.
Then they become linked to one another in the direction of the shear flow and finally merge into huge , elongated micelles. They look like columns.
When φ = 0.3, in the absence of shear (γ ̇ = 0), I did not find any well-regulated structure. But they look like gyroidal structure.
As the shear rate is increased up to γ ̇ = 0.02, the structure has changed and eventually turned into clear layers.
From the numerical analysis, I confirm that there are a lot of side by side configurations and tail to tail configurations, looking at the different g(r)
Obviously, they are not icosahedrons anymore. They seem to be like tetra-layers.
Finally, I’m going to show you the rheological results. This graph shows that at low volume fraction viscosity is constant regardless of shear rate.
However, at high volume fraction, preliminary results represent shear-thickening.
I found this behavior at the end of my research, so I don’t fully understand the mechanism yet.
But, I expect that there is a correlation between their viscosity and large scale structure because the structure is different.
(I think this is because shear rate becomes considerably large so that the interaction between particles can be neglected.
At low shear rate, I could not find the steady state because the simulations take time much longer. So I’m not quite sure these values are safe. )
In conclusions, I have analyzed the structure as a function of shear rate, temperature, volume fraction and interaction strength, and observed different types of aggregation depending on these factors. However, I did not find any clear bilayers or vesicles. I suspect that this is because of the lack of any attractive interaction for side-by-side configurations.
In future work, I will consider this matter in detail.
Thank you for your attention.
I calculated three g of r.
Then, I got three peak positions almost corresponding to an ideal icosahedron, described as dotted line. In this sense, my data confirms the icosahedral structure indicated by the snapshot.
(I can also say that there is no head-to-head configuration with distance σ from every particles.)
From the numerical analysis, I confirm that there are a lot of side by side configurations and tail to tail configurations, looking at the different g(r)
Obviously, they are not icosahedrons anymore. They seem to be like tetra-layers.
「この挙動は、zigzagの不自然な部分が引き起こすものかどうかをチェッックするため、Lees_Edwards のシステムと比較してみました。」
先ほどの、動径分布関数は測定したターゲットの全情報を足し合わせた平均的な情報であるため、これだけでは、詳細なクラスターサイズはわかりません。
なので、右上のようなクラスター判定のアルゴリズムを考えて、
横軸がクラスターサイズ、縦軸が出現確率を示す、グラフを作成しようと思っています。
今までのシミュレーションはすべてzigzagシステムで行いました。
このシステムは上下L/4の場所でx方向に剪断が最大にかかっていて、その部分では定常剪断が不連続になってしまい、不自然です。
そのため、Lees_Edwrds と比べたいと思います。
最後にもし時間があれば、Janus potential の式にside by side の相互作用の項を加えて、どのようなクラスターが得られるのかを見たいと思っています。
以上で終わります。
I tried to find a steady state from the time change of the total energy per particle. I extracted the data after the steady state (time= 8700) and calculated three radial distribution functions.
I got three peak positions almost corresponding to an ideal icosahedron, described as dotted line. In this sense, my microscopic data confirms the icosahedral structure indicated by the snapshot.
Next, I conducted multi-particle simulations to observe the effect of temperature on the structure. Here are the simulation conditions.