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Multi-carbazole derivatives for two-photon absorption data storage:Synthesis,optical properties and theoretical calculation

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science china Chemistry 2010年第4期53卷 884-890页

作者： LI Lin1, YANG JiaXiang1,2, WANG CaiXia1, HU ZhangJun1, TIAN YuPeng1,2, LI Jing3, WANG ChuanKui3, LI Ming4, CHENG GuangHua4, TANG HuoHong5, HUANG WenHao5, TAO XuTang2 & JIANG MinHua2 1department of Chemistry, Anhui university, hefei 230039, china 2State Key Laboratory of Crystal Materials, Institute of Crystal Materials of Shandong university, Jinan 250100, china 3department of Physics, Shandong Normal university, Jinan 250014, china 4State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and precision Mechanics, Chinese Academy of sciences, Xi’an 710119, china 5department of precision machinery and precision instrumentation, university of science and technology of china, hefei 230026, china 1. department of Chemistry Anhui University Hefei 230039 China2. State Key Laboratory of Crystal Materials Institute of Crystal Materials of Shandong University Jinan 250100 China3. Department of Physics Shandong Normal University Jinan 250014 China4. State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an 710119 China5. Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei 230026 China

Two novel quadrupolar organic compounds, 3-(4-((E)-2-(9-butyl-9H-carbazol-6-yl) vinyl)styryl)-9-propyl-9H-carbazole (BCSPC) and 3-(3-(3-((1E)-2-(4-((E)-2-(3-(3,5-bis(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazol-6-yl)vinyl)phenyl) vinyl)-9-butyl-9H-carbazol-6-yl)-5-(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazole (BCPBC), with different conjugated arms, have been designed and synthesized. Their one-and two-photon absorption (TPA) and excited fluorescence properties have been experimentally investigated. The two-photon absorption cross-sections of two compounds were estimated by two-photon excited fluorescence technique using 200 fs, 76 MHz, Ti:sapphire laser, which are 22 and 154 GM for BCSPC and BCPBC, respectively. The optimal excitation wavelengths are 780 nm for both BCSPC and BCPBC. A data recording experiment proved the potential application of the materials.

关键词： initiator optical data storage fluorescence two-photon absorption theoretical calculation

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Influence and Analysis of Concentrate Degree of Plasma Arc for Heat Process of Hardening Treatment

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材料热处理学报 2004年第5B期25卷 779-782页

作者： WANGShuo-gui YANHong-ri wdepartmentofprecisionmachineryandprecisionInstrument UniversityofScienceandTechnologyofChinaHefeiChina

According to the practicable model of the plasma arc surface quench, the influence law of the heat process, cooling course, temperature field about surface quench treatment by plasma arc due to the concentrate degree of plasma arc heat source are discussed in this paper. It shows that the concentrate degree of plasma arc heat source can change the width of the hardening zone and can not change the maximum harden depth. With the increase of the concentrate degree, the area of the heat influence zone is decreased and its shape is narrowed after the heat source. Relative to cooling rate, the influence of the heat source concentrate degree for heat absorption is bigger. The correctness of the practical model are proved with experimental results for quench hardening of steel by plasma arc.

关键词：等离子电弧热源表面淬火硬化处理集中度

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Orthogonally linear polarized lasers (I)——principle and devices

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Progress in Natural science:Materials International 2005年第7期15卷 586-595页

作者： ZHANG Shulian and XU Ting (State Key Laboratory of precision Measurement technology and Instruments, department of precision Instruments, Tsinghua university, Beijing 100084, china) State Key Laboratory of precision Measurement technology and Instruments Department of Precision Instruments Tsinghua University Beijing 100084 China

Two kinds of orthogonally polarized lasers, i. e. Zeeman dual-frequency lasers and four-frequency ring lasers (laser gyros) have been developed since the invention of lasers, in which circularly polarized lights oscillate. This paper summarizes recent progress of the study on orthogonally linear polarized lasers with the standing wave cavity. Firstly, the expression of producing orthogonally linear polarized lights in standing wave cavity, i. e. laser frequency splitting, is given. Almost all the birefringence effects made in laser cavity are used to produce orthogonally linear polarized lights. The effect includes quartz crystal birefringence effect, calcite birefringence effect, stress (photo-elastic) birefringence effect and electro-optical birefringence effect. Secondly, several physical phenomena of orthogonally linear polarized lasers are discovered such as aberrance of frequency splitting curves caused by optical activity of quartz crystal, order-passing of longitudinal modes with frequency splitting and strong modes competition. Finally, because the traditional Zeeman dual frequency laser cannot output frequency difference larger than 3 MHz, the approaches of obtaining larger frequency difference are studied. The sequential results, several kinds of orthogonally polarized lasers, are described, such as birefringence dual frequency lasers outputting a frequency difference from 40 MHz to hundreds of megahertz, birefringence-Zeeman dual frequency lasers outputting a frequency difference from 1 MHz to hundreds of megahertz, the LD pumped YAG birefringence dual frequency laser outputting frequency difference of several gigahertz, and the lasers whose longitudinal mode spacing is c/4L instead of c/2L .

关键词： orthogonally polarized laser dual frequency laser intra-cavity birefringence Zeeman effect photo-elastic birefringence electro-optical birefringence frequency splitting.

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Effects of Bases on the Stabilities of Nucleoside C4'Radicals

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Chinese Chemical Letters 2003年第10期14卷 1073-1076页

作者： Bo Lin LIN, Yao FU, Lei LIU, Qing Xiang GUO department of Chemistry, university of science and technology of china, hefei 230026 department of Chemistry University of Science and Technology of China

C4'-H bond dissociation enthalpies of nucleosides were predicted using theoretical methods to a precision of 1-2 Kcal/mol. It was found that the stability of the C4' nucleoside radical is slightly dependent on the bas... 详细信息

关键词： Nucleoside homolysis bond energy DNA lesion substituent effect.

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Orthogonal linear polarized lasers (Ⅲ)——Applications in self-sensing

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Progress in Natural science:Materials International 2005年第11期15卷 961-971页

作者： ZHANG Shulian, DU Wenhua and LIU Gang (The State Key Laboratory of precision Measurement technology and Instruments, department of precision Instruments, Tsinghua university, Beijing 100084, china) The State Key Laboratory of precision Measurement technology and Instruments Department of Precision Instruments Tsinghua University Beijing 100084 China

In this paper, the applications of orthogonal linear polarized lasers in self-sensing are reviewed. The properties for such a laser include the production of a new frequency in one longitudinal mode spacing, the tuning of frequency difference, the change of polarization states as cavity tuning, the control of mode competition intensity, the optical feedback, and so on. The orthogonal polarized lasers have been used as a laser nanometer ruler based on competition between two polarized lights in a HeNe laser and as a displacement measurement tool based on the optical feedback in the orthogonal polarized lasers. They are also used in the phase retardation measurement of a waveplate, the angle measurement, the vibration measurement, the pressure/force measurement, the weak magnetic field measurement, and so on. The structures of these new devices are simple and compact with the great advantages of high resolution and high accuracy. Some of these devices can trace to the source of the laser wavelength. The nanometer laser ruler is an example whose measurement range is 12 mm, resolution is 79 nm and linearity is less than 5×10-5. The repeatability of the phase retardation measuring system of waveplate can reach 3’.

关键词： orthogonal polarized laser frequency splitting optical feedback vibration measurement displacement measurement waveplate measurement angle measurement.

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Surface Nanometrology Based on SPM Techniques

Surface Nanometrology Based on SPM Techniques

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微纳制造技术应用研讨会

作者： Huang Wenhao Chen Yuhang Dang Xueming (department of precision machinery and instrumentation university of science and technology of china, china hefei 230026)

Surface nanometrology plays very important role in micro and *** this field,scanning probe microscopes (SPMs) are widely *** techniques show great potential in metrology because three-dimensional topographic features with nanometer even atomic resolution can be *** the last two decades,various theories and techniques have been developed to improve accuracy and stability of SPMs to meet the increasing requirements in surface *** this review article,we highlight some research results such as surface specifications and modeling,high resolution and high time-stability measurement,image interpretation and surface reconstruction,SPM errors and calibration,nanaopositiong *** technical trends are also covered.

关键词： Surface Nanometrology Based on SPM Techniques image SPM AFM 微纳制造

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Structure and kinematic analysis of a novel 2-DOF translational parallel robot

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Progress in Natural science:Materials International 2007年第10期17卷 1213-1219页

作者： Chen Tao1, Wu Chao2 and Liu Xinjun2(1. School of Application science and technology, Harbin university of science and technology, Harbin 150080, china 2. department of precision Instruments, Tsinghua university, Beijing 100084, china) School of Application science and technology Harbin University of Science and Technology Harbin 150080 China department of precision Instruments Tsinghua University Beijing 100084 China

This paper addresses the analysis of a novel parallel robot with 2 translational degrees of freedom (DOFs). The robot can position a rigid body in a plane with constant orientation. The kinematic structure of the robot is first described in detail. Some kinematic problems, such as the inverse and forward kinematics, velocity, and singularity are then analyzed. The working and assembly modes are discussed. Since it is the most important index to design a robot, the workspace of the robot is studied systematically in this paper. Based on the analysis of reachable workspace and singularity, a kind of workspace concept characterizing the region that the end-effector of the robot can reach in practice is defined. The results of this paper will be very useful for the design and application of the robot.

关键词： parallel robot degree of freedom kinematics workspace.

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Study on simulation and experiment of array micro Faraday cup ion detector for FAIMS

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science china(Technological sciences) 2010年第12期53卷 3225-3231页

作者： TANG Fei, WANG XiaoHao, ZHANG Liang & YAN ZiLin State Key Laboratory of precision Measurement technology and Instruments, department of precision Instruments and Mechanology, Tsinghua university, Beijing 100084, china 1. State Key Laboratory of precision Measurement technology and Instruments Department of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China

An array micro Faraday cup ion detector for FAIMS (High-field Asymmetric Waveform Ion Mobility Spectrometry) was introduced, with which the size of the FAIMS system was reduced. With simple structure, good stability, low noise, large measurements range, this detector can work under the condition of atmospheric pressure. The array micro Faraday cup was composed of gate electrode, sensitive electrode and shielding electrode. The sensitive electrode was made of tens of crossing silicon columns with diameter of 200 μm. It was fabricated through typical MEMS technology, which was compatible completely with plane FAIMS. It was shown from FLUENT simulation result that the resistance to gas motion was low and the flow field distribution was helpful for full absorption of the ion in this array design. Through electricity simulation, the method to reduce interference on the detection signal of the micro Faraday cup was given out. Connecting with KEITHLEY 237 ampere meter, the noise level of the array micro Faraday cup was lower than 0.5 pA. The output signal of the acetone sample measured by experiment was about 210 pA. Through contrast experiment, the design parameter of the micro Faraday cup was obtained primarily. This array micro Faraday cup can meet the requirements of the FAIMS system.

关键词： FAIMS MEMS Faraday cup ion detector low current

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直线送料器的性能分析及优化

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系统仿真学报 2008年第20期20卷 5538-5542,5547页

作者：臧红彬沈沈沈李晓光中国科学技术大学精密机械与精密仪器系合肥230027

针对生产中直线送料器存在的工件迟滞现象、传输效率低等问题,利用机械系统动力学自动分析软件ADAMS建立了系统的虚拟样机模型,基于虚拟样机技术,研究了系统结构和外部激励对其性能的影响,明确了缺陷产生的原因在于激励与系统的失谐,进... 详细信息

针对生产中直线送料器存在的工件迟滞现象、传输效率低等问题,利用机械系统动力学自动分析软件ADAMS建立了系统的虚拟样机模型,基于虚拟样机技术,研究了系统结构和外部激励对其性能的影响,明确了缺陷产生的原因在于激励与系统的失谐,进而对系统的主要构件:板簧、支架、驱动块和送料轨道对系统固有频率和模态的影响进行了深入研究,并据此对系统送料性能提出了优化对策.

关键词：直线送料器虚拟样机动力学分析优化

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Effect of the Taper Shape upon Transmission Efficiency of Fiber Probes for Scanning Near-field Optical Microscopy

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Chinese Journal of Lasers 1998年第4期 70-75页

作者： ZHANG Guoping MING Hai CHEN Xiaogang WU Yunxia XIE Jianping (department of Physics, university of science & technology of china, hefei 230026, china)WANG Keyi HUANG Wenhao (department of precision machinery, USTC, hefei 230026, china)

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ，ｔｈｅｓｃａｎｎｉｎｇｎｅａｒｆｉｅｌｄｏｐｔｉｃａｌｍｉｃｒｏｓｃｏｐｙ（ＳＮＯＭ）ｈａｓａｔｒａｃｔｅｄｍｕｃｈａｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｉｔｓｕｌ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｒｅｃｅｎｔｙｅａｒｓ，ｔｈｅｓｃａｎｎｉｎｇｎｅａｒｆｉｅｌｄｏｐｔｉｃａｌｍｉｃｒｏｓｃｏｐｙ（ＳＮＯＭ）ｈａｓａｔｒａｃｔｅｄｍｕｃｈａｔｅｎｔｉｏｎｂｅｃａｕｓｅｏｆｉｔｓｕｌｔｒａｈｉｇｈｒｅｓｏｌｕｔｉｏ...

关键词： scanning near field optical microscopy fiber probe transmission efficiency probe geometry

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