检索结果-南通市图书馆

Simultaneous, hybrid single-molecule method by optical tweezers and fluorescence

在线全文

学校读者我要写书评

暂无评论

Nanotechnology and Precision Engineering 2019年第4期2卷 145-156页

作者： Guoteng Ma Chunguang hu Shuai Li Xiaoqin Gao Hongbin Li xiaotang hu State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University300072China Nanchang Institute for Microtechnology of Tianjin University Tianjin 300072China Department of Chemistry University of British ColumbiaVancouverBC V6T 1Z1Canada

As studies on life sciences progress toward the single-molecule level,new experiments have put forward more requirements for simultaneously displaying the mechanical properties and conformational changes of *** tweezers and fluorescence microscopy have been combined to solve this *** combination of instruments forms a new generation of hybrid single-molecule technology that breaks through the limitations of traditional biochemical *** and fluorescence visualization have beenwidely used,and these techniques provide new possibilities for studying complex biochemical reactions at the singlemolecule *** paper explains the features of this combined technique,including the application characteristics of single-trap and dual-traps,the anti-bleaching method,and optical tweezers combined with epifluorescence,confocal fluorescence,total internal reflection fluorescence,and other fluorescence *** typical experiments,we analyze technical solutions and explain the factors and principles that instrument designers should *** review aims to give an introduction to this novel fusion technology process and describe important biological results.

关键词： Single-molecule Optical tweezers Confocal fluorescence FRET TIRF

Nonlinear phase error analysis of equivalent thickness in a white-light spectral interferometer

在线全文

学校读者我要写书评

暂无评论

Nanotechnology and Precision Engineering 2019年第2期2卷 77-82页

作者： Tong Guo Qianwen Weng Bei Luo Jinping Chen Xing Fu xiaotang hu State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University

A white light spectral interferometry based on a Linnik type system was established to accurately measure the thin film thickness through transparent *** practical work,the equivalent thickness of a beam splitter and the mismatch of the objective lens introduce nonlinear phase *** a transparent medium also increases the equivalent *** simulation results showthat the equivalent thickness has a significant effect on thin film thickness ***,it is necessary to perform wavelength correction to provide a constant equivalent thickness for *** the experiments,some pieces of cover glasses as the transparent medium were added to the measured beam and then a standard thin film thickness of 1052.2±0.9 nm was tested through the transparent *** results demonstrate that our system has a nanometer-level accuracy for thin film thickness measurement through transparent medium with optical path compensation.

关键词： White light spectral interferometry Thin film thickness measurement Nonlinear phase Equivalent thickness Transparent medium

The Optical Characteristics of the Acousto-optic Tunable Filter with the Equivalent Point

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2002年第2期11卷 55-60页

作者： XU Kexin NI Yong XUE Bin JIANG Chengzhi hu xiaotang( State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China) Tianjin University State Key Laboratory of Precision Measuring Technology and Instruments 天津 300072

In this paper, the interaction curves of acoustic and optical waves in a non-collinear AOTF (acousto-optic tunable filter) cell under the parallel-tangent momentum matching condition are analyzed systematically. A new theory of equivalent point for AOTF design is put forward. The wavelength characteristics and the wavelength resolution of two diffraction beams with equivalent point design in AOTF are emphatically analyzed. The optical characteristics at δ = 0 (ideal case) and δ≠0 (real case) are also discussed. The advantages of the AOTF with equivalent point design include high wavelength resolution, more quantitative energy and larger incident angle aperture.

关键词： equivalent point momentum matching AOTF TeO2

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

动态电场诱导氧化实现纳米结构的加工

仪器仪表学报 2005年第2期26卷 131-133页

作者：郭彤胡晓东胡小唐天津大学精密测试技术及仪器国家重点实验室天津300072

利用原子力显微镜 (AFM )进行表面的局部氧化加工是进行纳米结构加工的一种很有前途的方法。它具有广泛的应用范围 ,可以进行功能性纳米电子器件和纳米机械结构的加工。实验采用了动态电场作用下的AFM诱导氧化的方法 ,提高了氧化物的生... 详细信息

利用原子力显微镜 (AFM )进行表面的局部氧化加工是进行纳米结构加工的一种很有前途的方法。它具有广泛的应用范围 ,可以进行功能性纳米电子器件和纳米机械结构的加工。实验采用了动态电场作用下的AFM诱导氧化的方法 ,提高了氧化物的生长速度 ,并且改善了氧化结构的纵横比 ,能够更好地控制生成氧化物的结构和电属性。

关键词：纳米结构电场诱导氧化加工原子力显微镜(AFM) 动态纳米电子器件局部氧化应用范围机械结构电场作用生长速度氧化物功能性纵横比

在线全文

学校读者我要写书评

暂无评论

纳米定位技术研究现状

机械设计与研究 2000年第1期16卷 43-44页

作者：王建林胡小唐北京化工大学北京100029 天津大学

纳米定位技术是前沿科学、工程技术领域的关键技术之一 ,是实现纳米加工和纳米测量的基础。本文介绍了纳米定位技术的研究现状 ,给出几种近年来研制的典型纳米定位机构 ,对其工作原理及优缺点进行了分析。

关键词：纳米定位技术柔性铰链微位移驱动器

基于模糊集与小波技术的MEMS平面运动测量

在线全文

学校读者我要写书评

暂无评论

仪器仪表学报 2010年第6期31卷 1369-1374页

作者：陈治胡晓东傅星胡小唐天津大学精密测试技术及仪器国家重点实验室天津300072

实现对MEMS的微结构平面运动幅值提取和分析,为提高MEMS器件的性能和可靠性分析提供重要参考。在连续光照明条件下,提出了一种基于模糊集图像增强技术与小波变换边缘检测技术相结合的MEMS运动幅值测量方法。该方法通过模糊集技术对MEMS... 详细信息

实现对MEMS的微结构平面运动幅值提取和分析,为提高MEMS器件的性能和可靠性分析提供重要参考。在连续光照明条件下,提出了一种基于模糊集图像增强技术与小波变换边缘检测技术相结合的MEMS运动幅值测量方法。该方法通过模糊集技术对MEMS运动模糊特征带进行图像增强及降噪处理,并结合小波变换技术提取MEMS谐振器的运动幅值。通过扫频实验获得MEMS谐振器的平面运动幅值响应曲线。实验结果表明,该方法的测量重复性误差优于55 nm。

关键词： MEMS谐振器运动检测模糊集小波变换模糊图像

MEMS Test System Based on Virtual Instrument Technology

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2007年第2期13卷 88-92页

作者：胡晓东栗大超郭彤胡春光胡小唐 State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University

On account of the multiformity of MEMS devices, it is necessary to integrate with some optical measurement techniques for meeting static and dynamic unit test requirements. In this paper, an automated MEMS test system is built of some commercially available components and instruments based on virtual instrument technology. The system is integrated with stroboscopic imaging, computer micro-vision, microscopic Mirau phase shifting interferometry, and laser Doppler vibrometer, and is used for the measurement of full-view in-plane and out-of-plane geometric parameters and periodical motions and single spot out-of-plane transient motion. The system configuration and measurement methods are analyzed, and some applications of the measurement of in-plane and out-of-plane dimensions and motions were described. The measurement accuracy of in-plane dimensions and out-of-plane dimensional is better than 0.2 um and 5 nm respectively. The resolution of measuring in-plane and out-of-plane motions is better than 15 nm and 2 nm respectively.

关键词： MEMS optical measurement technique stroboscopic imaging virtual instrument dynamic test

Effects of Parameters in Femtosecond Laser Micromachining on Ablation of Silicon

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2009年第3期15卷 225-228页

作者：陈治傅星耿娜胡小唐 State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University

A series of ablation experiments on silicon surface by femtosecond laser system of 775 nm and 150 fs duration pulses were carried *** morphological characteristics and the associated effect in the ablation were tested by atomic force microscope(AFM),scanning electron microscope(SEM),focused ion beam(FIB),and the optic *** single pulse threshold can be obtained *** the multiple pulses,the ablation threshold varies with the number of pulses applied to the surface due to the incubation *** analyzing the experimental data,the thresholds of laser fluences under various laser pulse numbers were obtained,and the relationships between ablation area and laser energy and laser pulse number were ***,the periodic ripple structure on silicon surface was *** the condition of certain laser power,the number of laser pulse can influence the formation of ripples.

关键词： femtosecond pulse laser microstructure machining silicon ablation threshold incubation effect

在线全文

学校读者我要写书评

暂无评论

用扫描隧道显微技术实现原子识别的原理初探

仪器仪表学报 1998年第4期19卷 373-376页

作者：李艳宁傅星胡小唐天津大学精仪学院

本文阐述用扫描探针显微技术获取样品表面功函数、局域态密度以及原子表观半径的基本理论和方法，提出了根据这些表面信息进行原子识别的基本思想。

关键词：原子识别扫描隧道显微镜功函数局域态密度