This document provides an overview of classical and quantum free electron theories of metals. The classical theory postulates that valence electrons in metals are free and move randomly, colliding with ions. When an electric field is applied, free electrons drift in the opposite direction. The quantum theory assumes electrons have wave-like properties and their energy levels are quantized. The classical theory can explain electrical and thermal conductivity but fails to explain various quantum effects. The quantum theory resolves issues like temperature-independent paramagnetism.
Lecture 8: Introduction to Quantum Chemical Simulation graduate course taught at MIT in Fall 2014 by Heather Kulik. This course covers: wavefunction theory, density functional theory, force fields and molecular dynamics and sampling.
This Presentation "Energy band theory of solids" will help you to Clarify your doubts and Enrich your Knowledge. Kindly use this presentation as a Reference and utilize this presentation
Lecture 8: Introduction to Quantum Chemical Simulation graduate course taught at MIT in Fall 2014 by Heather Kulik. This course covers: wavefunction theory, density functional theory, force fields and molecular dynamics and sampling.
This Presentation "Energy band theory of solids" will help you to Clarify your doubts and Enrich your Knowledge. Kindly use this presentation as a Reference and utilize this presentation
The splitting of the main spectral line into two or more components with a slight variation in wavelength in the magnetic field is called fine structure in spectroscopy. It means that, in the magnetic field, the electron energy splits to give its sub-states. The electron transitions from these substituent energy levels give additional spectral lines. These are known as fine structures of the main spectral line. The hydrogen spectrum exhibiting the fine structured lines is known as the hydrogen fine spectrum.
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Properties of superconductors, Effects of the magnetic field, variation of resistance with temperature, Meissner Effect, isotope effect, Energy Gap, Coherence Length, BCS Theory, Types of superconductors ,
The splitting of the main spectral line into two or more components with a slight variation in wavelength in the magnetic field is called fine structure in spectroscopy. It means that, in the magnetic field, the electron energy splits to give its sub-states. The electron transitions from these substituent energy levels give additional spectral lines. These are known as fine structures of the main spectral line. The hydrogen spectrum exhibiting the fine structured lines is known as the hydrogen fine spectrum.
For more information on this topic, kindly visit our blog article at;
https://jayamchemistrylearners.blogspot.com/2022/04/fine-structure-of-hydrogen-atom.html
Properties of superconductors, Effects of the magnetic field, variation of resistance with temperature, Meissner Effect, isotope effect, Energy Gap, Coherence Length, BCS Theory, Types of superconductors ,
Electrical and Magnetic Properties of MaterialsAbeni9
Properties of a material which determine its response to an electric field.
Materials are classified based on their electrical properties as conductors, semiconductors and insulators and newly super conductors.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
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introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
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Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
2. Current Density
It is the current flowing across unit area
of a metal in the presence of an external
electric field.
It is given by
j = nevd
where n is the carrier concentration, e is
the charge of electron and vd is
the drift velocity of free electrons.
Its unit of measurement is
Ampere/metre2.
3. Mean Free Path & Mean Free Time
It is the average distance
travelled by free electrons
between two successive
collisions with lattice ions
in a metal subjected to
electric field.
It is the average time
taken by the free electrons
between two successive
collisions with the lattice
ions in a metal subjected
to electric field.
4. Postulates of Classical Free Electron Theory
• Metals consist of atoms, which in turn, consist of a nucleus and electrons.
• Valence electrons are free and the metal is visualized as an array
of ions permeated by a gas of free electrons.
• In the absence of an electrical field, electrons move in random
directions colliding with ions or free electrons.
• In an electrical field, free electrons are accelerated and move in
the opposite direction compared to that of the electric field.
• Electron velocities obey Maxwell–Boltzmann distribution function.
• Free electrons move without interaction between them and they obey the laws of
classical kinetic theory of gases.
• Free electrons move in a uniform potential field since ions are fixed in the lattice.
5. MERITS OF CLASSICAL FREE ELECTRON
THEORY
• It explains the
Ohm’s law.
• It explains the
electrical and
thermal
conductivities of
metals.
• It derives
Wiedemann–Franz
law.
• It explains the
optical properties of
metals.
6. DRAWBACKS
OF CLASSICAL
FREE
ELECTRON
THEORY
• It fails to explain the photoelectric effect, Compton effect,
black body radiation, etc.
• It gives a value of 4.5R for the specific heat of metals.
But, the experimental value is only 3R.
• It does not explain the ferromagnetism.
• The long mean free paths (more than one cm) of the free
electrons at low temperatures cannot be explained on the
basis of the classical theory.
• Experimental results shows that paramagnetism of metals
is independent of temperature which deviates from classical
result that paramagnetic susceptibility is inversely
proportional to the temperature.
8. QUANTUM FREE ELECTRON THEORY
The important assumptions made by Sommerfeld are given below:
• The free electrons move in a constant potential inside the metal
and are confined within defined boundaries.
• The eigen values of the conduction electron are quantized.
• The electrons are considered to posses wave nature.
• In the various allowed energy levels, distribution of electrons takes
place according to Pauli’s exclusion principle.
• Mutual attraction between electrons and lattice ions and the
repulsion between individual electrons may be ignored.