Absorption coefficient of quantum well structure
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The document discusses the absorption coefficient in a quantum well for intraband transitions between energy levels. It presents the formula for absorption coefficient as a function of oscillator strength between levels, doping density, and Lorentzian lineshape. It derives the oscillator strength between the two lowest consecutive states in terms of the quantum well width. The absorption coefficient is then incorporated with a Lorentzian lineshape to better fit practical experimental data.
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Foc ppt
The common area A is given by:
A = π(a2 - (a - d)2) for d < a
A = 0 for d ≥ a
So the coupling efficiency η is given by:
η = A/πa2 = (1 - (d/a)2) for d < a
= 0 for d ≥ a
This shows that coupling efficiency decreases quadratically with offset d.
Even a small offset can cause significant power loss. Precise alignment is critical.
Irfan khan
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Foc ppt
The common area A is given by:
A = π(a2 - (a - d)2) for d < a
A = 0 for d ≥ a
So the coupling efficiency η is given by:
η = A/πa2 = (1 - (d/a)2) for d < a
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Irfan khan
Angular misalignment
- Angular misalignment occurs when the axes of the two fibers are not
perfectly parallel.
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[3] When carriers recombine, they restore equilibrium conditions by decaying over time with a characteristic lifetime. Recombination involves traps and centers that facilitate the process.
International Journal of Engineering Research and Development (IJERD)
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Gain parameters of BJT
This document discusses the bipolar junction transistor. It describes the emitter, collector, and base regions and their doping levels. The current gain parameters alpha and beta are defined as the ratios of various currents. Alpha is approximately 1 due to some carrier recombination and leakage currents. Beta is much greater than 1. Injection, transport, and collection efficiencies are also defined. The document discusses base width modulation and the Early effect where the base width decreases with increasing collector voltage. Punch-through breakdown occurs when the depletion regions merge.
G24041050
This document discusses the optimization and simulation of Josephson junctions as switching elements. It begins with an introduction stating the need to optimize Josephson junction parameters and characteristics to increase switching speed. It then provides a brief review of the Josephson effect and properties of Josephson junctions. The rest of the document details a theoretical approach to estimating junction parameters, characteristics, and optimization methods, and using computer simulation to model the dynamic response of Josephson junctions to better understand their switching performance and speed.
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This document contains lecture notes for PHY 712 Electrodynamics. The lecture will cover special topics in electromagnetism including a continued discussion of electromagnetic aspects of superconductivity and a review of reflection and refraction. The notes provide details on Josephson junctions, modeling the tunneling current between two superconductors, and derive equations relating the reflection and transmission of electromagnetic waves at boundaries between different dielectric media.
Neural network precept diagnosis on petrochemical pipelines for quality maint...
This document describes a proposed neural network model for predicting degradation in petrochemical pipelines. It begins with background on pipelines and fatigue crack propagation based on Paris' law. It then discusses stresses in cylindrical pipelines under internal pressure. The model represents crack growth as a function of stress intensity factor and uses a recurrent formula to calculate cumulative damage over time. The goal is to develop a prognostic tool for quality maintenance in pipeline systems.
Capacitor
1) The document discusses different types of capacitors including parallel plate, cylindrical, and spherical capacitors. Equations for electrostatic potential and electric field are derived for each type.
2) Examples problems are worked out on determining the capacitance of a parallel plate capacitor when a dielectric slab is inserted, and the capacitance of a coaxial cylindrical capacitor with dielectrics of different permittivities in each region.
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11.[5 15]neural network precept diagnosis on petrochemical pipelines for qual...
This document summarizes a research paper about using neural networks to develop a prognostic model for predicting fatigue damage in petrochemical pipelines. The researchers propose using Paris' law and Miner's law to model crack propagation and cumulative damage. They develop a recurrent neural network model to predict crack length over time under different pressure levels. Simulation results show the model can estimate remaining lifetime under three pressure modes, with lifetimes of around 115 hours for high pressure, 160 hours for middle pressure, and 240 hours for low pressure. The neural network approach allows prognostic evaluation of pipeline condition to support quality maintenance in petrochemical industries.
11.neural network precept diagnosis on petrochemical pipelines for quality ma...
This document summarizes a research paper about using neural networks to develop a prognostic model for predicting fatigue damage in petrochemical pipelines. The researchers propose using Paris' law and Miner's law to model crack propagation and cumulative damage. They develop a recurrent neural network model to predict crack length over time under different pressure levels. Simulation results show the model can estimate remaining lifetime under three pressure modes, with lifetimes of around 115 hours for high pressure, 160 hours for middle pressure, and 240 hours for low pressure. The neural network approach allows prognosis of pipeline condition to aid quality maintenance in petrochemical industries.
The integral & fractional quantum hall effect
Introductory idea of integral & fractional quantum hall effect and by imposing the idea of composite fermions showing the existence of fractional charge.
05SurfacePlasmons.ppt
1. Surface plasmons are electromagnetic waves that exist at the interface between a metal and a dielectric material. They arise from the interaction of light with free electrons in metals.
2. Several methods can excite surface plasmons, including using a prism or diffraction grating. Spectroscopy of surface plasmons in nanostructures involves studying nanoparticles and nanostructures.
3. Applications of surface plasmons include sensors, nanophotonics, and surface enhanced Raman spectroscopy. The field of plasmonics has grown significantly in recent decades as shown by the increasing number of publications mentioning surface plasmons.
Similar to Absorption coefficient of quantum well structure (20)
International Journal of Engineering Research and Development (IJERD)
International Journal of Engineering Research and Development (IJERD)
Neural network precept diagnosis on petrochemical pipelines for quality maint...
Neural network precept diagnosis on petrochemical pipelines for quality maint...
11.[5 15]neural network precept diagnosis on petrochemical pipelines for qual...
11.[5 15]neural network precept diagnosis on petrochemical pipelines for qual...
11.neural network precept diagnosis on petrochemical pipelines for quality ma...
11.neural network precept diagnosis on petrochemical pipelines for quality ma...
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一比一原版(USF毕业证)旧金山大学毕业证如何办理
原件一模一样【微信：95270640】【旧金山大学毕业证USF学位证成绩单】【微信：95270640】（留信学历认证永久存档查询）采用学校原版纸张、特殊工艺完全按照原版一比一制作（包括：隐形水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠，文字图案浮雕，激光镭射，紫外荧光，温感，复印防伪）行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备，十五年致力于帮助留学生解决难题，业务范围有加拿大、英国、澳洲、韩国、美国、新加坡，新西兰等学历材料，包您满意。
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留信网认证的作用:
1:该专业认证可证明留学生真实身份【微信：95270640】
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
→ 【关于价格问题（保证一手价格）
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
选择实体注册公司办理，更放心，更安全！我们的承诺：可来公司面谈，可签订合同，会陪同客户一起到教育部认证窗口递交认证材料，客户在教育部官方认证查询网站查询到认证通过结果后付款，不成功不收费！
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办理旧金山大学毕业证USF学位证毕业证学位证【微信：95270640 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理旧金山大学毕业证毕业证学位证USF学位证【微信：95270640 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理旧金山大学毕业证毕业证学位证USF学位证【微信：95270640 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
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原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
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四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微bwp0011】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
一比一原版(uofo毕业证书)美国俄勒冈大学毕业证如何办理
原版一模一样【微信：741003700 】【(uofo毕业证书)美国俄勒冈大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
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SCALING OF MOS CIRCUITS m .pptx
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Applications of artificial Intelligence in Mechanical Engineering.pdf
Historically, mechanical engineering has relied heavily on human expertise and empirical methods to solve complex problems. With the introduction of computer-aided design (CAD) and finite element analysis (FEA), the field took its first steps towards digitization. These tools allowed engineers to simulate and analyze mechanical systems with greater accuracy and efficiency. However, the sheer volume of data generated by modern engineering systems and the increasing complexity of these systems have necessitated more advanced analytical tools, paving the way for AI.
AI offers the capability to process vast amounts of data, identify patterns, and make predictions with a level of speed and accuracy unattainable by traditional methods. This has profound implications for mechanical engineering, enabling more efficient design processes, predictive maintenance strategies, and optimized manufacturing operations. AI-driven tools can learn from historical data, adapt to new information, and continuously improve their performance, making them invaluable in tackling the multifaceted challenges of modern mechanical engineering.
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In the world with high technology and fast
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through many online platforms like Linkedin, Naukri,
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Mechanical Engineering PROJECT REPORT ON SUMMER VOCATIONAL TRAINING
AT MBB AIRPORT
Tools & Techniques for Commissioning and Maintaining PV Systems W-Animations ...
Join us for this solutions-based webinar on the tools and techniques for commissioning and maintaining PV Systems. In this session, we'll review the process of building and maintaining a solar array, starting with installation and commissioning, then reviewing operations and maintenance of the system. This course will review insulation resistance testing, I-V curve testing, earth-bond continuity, ground resistance testing, performance tests, visual inspections, ground and arc fault testing procedures, and power quality analysis.
Fluke Solar Application Specialist Will White is presenting on this engaging topic:
Will has worked in the renewable energy industry since 2005, first as an installer for a small east coast solar integrator before adding sales, design, and project management to his skillset. In 2022, Will joined Fluke as a solar application specialist, where he supports their renewable energy testing equipment like IV-curve tracers, electrical meters, and thermal imaging cameras. Experienced in wind power, solar thermal, energy storage, and all scales of PV, Will has primarily focused on residential and small commercial systems. He is passionate about implementing high-quality, code-compliant installation techniques.
Supermarket Management System Project Report.pdf
Supermarket management is a stand-alone J2EE using Eclipse Juno program.
This project contains all the necessary required information about maintaining
the supermarket billing system.
The core idea of this project to minimize the paper work and centralize the
data. Here all the communication is taken in secure manner. That is, in this
application the information will be stored in client itself. For further security the
data base is stored in the back-end oracle and so no intruders can access it.
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Absorption coefficient of quantum well structure
- 1. Course: Quantum Electronics Arpan Deyasi Topic: Absorption Coefficient of Quantum Well for Intraband Transition 1 Arpan Deyasi,RCCIIT 1/17/2021
- 2. 1/17/2021 2Arpan Deyasi,RCCIIT Absorption Coefficient in Quantum Well for Intraband Transition
- 3. 1/17/2021 3Arpan Deyasi,RCCIIT Absorption Coefficient in Quantum Well for Intraband Transition For two consecutive levels, wavefunctions are 2 ( ) cosn n z z L L π ψ = 2 ( ) sinm m z z L L π ψ =
- 4. 1/17/2021 4Arpan Deyasi,RCCIIT Absorption Coefficient in Quantum Well for Intraband Transition Absorption coefficient for quantum well inside conduction band is 2 2 *2 , ( )0 2 . . . 1 ( ) . . . . . ( ) ( ) z i j i jr i j j i FD FD q N z i p j c n m V E E f f ωπ α ε ω δ ω ≠ × × − − × − ∑
- 5. 1/17/2021 5Arpan Deyasi,RCCIIT Absorption Coefficient in Quantum Well for Intraband Transition ‘i’ th state is associated with wavevetor ‘ki’ ‘j’ th state is associated with wavevetor ‘kj’ We also assume corresponding integers are ‘n’ and ‘m’
- 6. 1/17/2021 6Arpan Deyasi,RCCIIT Absorption Coefficient in Quantum Well for Intraband Transition 22 z i z ji p j nk p mk= 2 /2 2 /2 2 cos 2 sin L z L n z L L i p j d m z i dz dz L L π π− × = − − ∫
- 7. 1/17/2021 Arpan Deyasi,RCCIIT 7 Absorption Coefficient in Quantum Well for Intraband Transition if n = 1, m =2 (two lowest consecutive states) 2 2 2 8 64 3 9 i LHS L L =− =
- 8. 1/17/2021 Arpan Deyasi,RCCIIT 8 Absorption Coefficient in Quantum Well for Intraband Transition 2 2 *2 2 0 , ( ) 2 . . . 1 64 ( ) . . . . 9 ( ) ( ) r i j j i FD FD i j i j q N c n V m L E E f f ωπ α ω ε ω δ ω ≠ = × × × − − × −∑
- 9. 1/17/2021 Arpan Deyasi,RCCIIT 9 Absorption Coefficient in Quantum Well for Intraband Transition Oscillator strength between two consecutive states are given by 2 2 8 * 3 ijO m Lω = ×
- 10. 1/17/2021 Arpan Deyasi,RCCIIT 10 Absorption Coefficient in Quantum Well for Intraband Transition 2 * 0 . . . ( ) ( ) . . . . ij r q N O E c n m ωπ α ω δ ω ε = × × ∆ −
- 11. 1/17/2021 Arpan Deyasi,RCCIIT 11 Absorption Coefficient in Quantum Well for Intraband Transition To fit with practical data, Lorentzian lineshape function is incorporated 2 * 0 2 2 . . . ( ) . . . . ( ) [( ) ij r q N O c n m E E ωπ α ω ε δ ω π ω = × × Γ ∆ − × ∆ − +Γ
- 12. 1/17/2021 12Arpan Deyasi,RCCIIT References O.Manaresh, “Semiconductor Heterojunctions and Nanostructures”, MH https://ocw.mit.edu/courses/electrical-engineering-and-computer- science/6-772-compound-semiconductor-devices-spring-2003/lecture- notes/Lecture15.pdf