搜索结果: 121-135 共查到“知识库 应用物理学”相关记录802条 . 查询时间(0.865 秒)
基于GaAs MMIC技术的残余应力测试结构的模拟与设计
GaAs 残余应力 应力梯度 实验验证
2014/4/23
残余应力对开关梁的力学特性有着重要的影响。梁的弹性系数k由梁的形状和材料特性（杨氏模量和残余应力）来决定。应力梯度会使悬臂梁发生卷曲，对k也会产生影响。由残余应力引起的梁的长度变化量在微米级别，一般实验仪器难于测量。基于GaAs基和Si基的器件残余应力不同，相应的测试结构需重新设计。为了克服这些问题，本论文重新模拟并优化了微旋转式残余应变测试结构，尽量简化对测试仪器的要求。本文使用Intellis...
用400 nm和800 nm线偏振飞秒激光垂直聚焦于对氨基偶氮苯薄膜表面上，以形成纳米微结构.实验观察到400 nm和800 nm线偏光照射样品表面分别得到周期为210 nm和500 nm的干涉条纹，条纹周期均随激光能流密度的增强而增大.通常认为这种周期结构是由入射激光与材料表面的散射光相干涉所形成的：光的干涉引起材料表面温度呈现梯度变化，从而引起表面张力呈现梯度变化，诱导周期条纹的产生.制备...
聚丙烯腈改性碳纳米管复合材料的电性能
多壁碳纳米管 聚丙烯腈 热处理改性 电性能
2014/1/10
采用溶液聚合的方法制备聚丙烯腈，对聚丙烯腈进行热处理改性后，与碳纳米管共混制备复合材料.与未改性处理的复合材料相比，电导率提高了2个多数量级.用FTIR、Raman和XPS等方法进行研究，结果表明聚丙烯腈经热处理改性后,部分腈基(—C≡〖KG-*5/7〗≡N)转变为亚胺基（—C=〖KG-*4/7〗=N），其链状结构向环状结构转化，MWNTs上的π电子与改性后聚丙烯腈的π电子之间形成强的π-π共轭，...
Nondeterministic ultrafast ground-state cooling of a mechanical resonator
Nondeterministic ultrafast ground-state cooling mechanical resonator
2014/5/28
We present a feasible scheme for the cooling of a mechanical resonator via projective measurements on an auxiliary flux qubit which interacts with it. We find that ground-state cooling can be achieved...
经典物理中的某些基本问题仍应该探索.首先探讨声学、波和非线性,其次提出电磁学中的某些可能的发展方法，特别研究了电动力学中运动方程和场方程的不一致，由此应该发展为电磁广义相对论，第三讨了论非线性光学和光子具有静质量等新问题，最后探讨超光速和中微子等.
The LHC with its unprecedented energy offers unique opportunities for groundbreaking measurements in p+p, p+A and A+A collisions even beyond the baseline experimental designs. ALICE is setting up a pr...
Pound-locking for characterization of superconducting microresonators
Pound-locking superconducting microresonators
2011/9/6
We present a new application and implementation of the so-called Pound locking technique for the interrogation of superconducting microresonators. We discuss how by comparing against stable frequency ...
A 1 mm Scintillating Fibre Tracker Readout by a Multi-anode Photomultiplier
Multi-anode Scintillating Fibre Tracker Readout
2011/9/7
This technical note describes a prototype particle tracking detector constructed with 1 mm plastic scintillating bres with a 64 channel Hamamatsu H8500
at-panel multi-anode photomultiplier readout....
Experimental observation of the steady - oscillatory transition in a cubic lid-driven cavity
Experimental observation oscillatory transition cubic lid-driven cavity Fluid Dynamics
2011/8/2
Abstract: Particle image velocimetry is applied to the lid-driven flow in a cube to validate the numerical prediction of steady - oscillatory transition at lower than ever observed Reynolds number. Ex...
Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe0.926Co0.074)2As2 single crystal
Instrumentation and Detectors depth, temperature dependence.
2011/9/29
In-plane surface Ka-band microwave impedance of optimally doped single crystals of the Fe-based superconductor Ba(Fe0.926Co0.074)2As2 (Tc= 22.8K) was measured. Sensitive sapphire disk quasi-optical re...
Momentum measurement by the Multiple Coulomb Scattering method in the OPERA lead emulsion target
Momentum measurement the Multiple Coulomb Scattering method
2011/9/9
A new method of momentum measurement of charged particles through Multiple Coulomb Scattering (MCS) in the OPERA lead emulsion target is presented. It is based on precise measurements of track angular...
Discrimination of alpha and beta/gamma interactions in a TeO$_2$ bolometer
neutrino mass, double beta decay, bolometers, Cerenkov detector
2011/9/9
TeO2 crystals have proven to be superb bolometers for the search of neutrinoless double beta decay in many respects.However, if used alone, they do not exhibit any feature that allows to discriminate ...
Performance simulation of a MRPC-based PET Imaging System
MRPC-based Imaging System Performance simulation
2011/9/8
The low cost and high resolution gas-based Multi-gap Resistive Plate Chamber (MRPC) opens a new possibility to find an efficient alternative detector for Time of Flight (TOF) based Positron Emission T...
Simulated Performance Of Algorithms For The Localization Of Radioactive Sources From A Position Sensitive Radiation Detecting System (COCAE)
Monte Carlo simulations, Semiconductor detectors, Gamma-ray spectroscopy,Compton camera
2011/9/8
Simulation studies are presented regarding the performance of algorithms that localize point-like radioactive sources detected by a position sensitive portable radiation instrument (COCAE). The source...
Development of a modular and scalable data acquisition system for calorimeters at a linear collider
Data acquistion concepts Modular electronics Front-end electronics for detector readout.
2011/9/8
A data acquisition (DAQ) system has been developed which will read out and control calorimeters serving as prototype systems for a future detector at an electron-positron linear collider. This is a mo...