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Acoustic impedance characteristics of linear compressors

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第7期14卷 494-503页

作者： Zhi-hua GAN Long-yi WANG Sheng-ying ZHAO Yu-jing SONG Wei-wei WANG Yi-nong WU institute of Cryogenics and Refrigeration Zhejiang University School of information and Electrical Engineering Zhejiang University City College shanghai institute of Technical Physics Chinese Academy of Sciences

The acoustic field of a linear compressor serves to deliver the compression work to the load, such as the connected cold head of a cryocooler; it plays an equivalently important role as the electrical and mechanical parts, especially in the impedance match issue. This paper studies the acoustic impedance characteristics of a linear compressor. The parameters including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, the pressure-volumetric (PV) power delivered, and the efficiency are theoretically and experimentally investigated. Different from previous theoretical studies, optimization for the operations away from the resonance is also included. More general optimization results imply relevance between thermoacoustic engines and linear compressors. The predicted results are validated by the experiments performed on a linear compressor with an adjustable resistive-capacitive (RC) acoustic load. The comparisons between the calculations and the measurements are presented and analyzed. The results provide deeper insight into the mechanism of the linear compressor and the impedance match in a cryocooler system.

关键词： Linear compressor Acoustic impedance Resistive-capacitive (RC) load

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建筑室内热环境的模糊评判模型

上海交通大学学报 2002年第2期36卷 169-172页

作者：连之伟冯海燕上海交通大学动力与能源工程学院上海200030 西安科技信息研究所西安710061

以地板送风空调房间为对象 ,通过大量调查与人体热舒适实验 ,引入模糊数学的方法 ,确定了 4个室内环境主要影响因素 (环境温度、风速、相对湿度、平均辐射温度 )相对于热感 7级别的隶属函数 ,并建立了相应的热舒适模糊综合评判模型 .

关键词：建筑室内热环境模糊评判模型空气调节热舒适

Single photon response of superconducting nanowire single photon detector

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Science Bulletin 2010年第Z1期 441-445页

作者： YOU LiXing, SHEN XiaoFang & YANG XiaoYan State Key Laboratory of Functional Materials for Informatics, shanghai institute of {2. and information technology (SIMIT), chinese Academy of sciences, shanghai 2.0050, china

Single photon detection is one of the key technologies for quantum key distribution in quantum communication. As a novel single photon detection technology, superconducting nanowire single photon detector (SNSPD) surpasses conventional semiconducting single photon detectors with high count rate and low dark count rate. In this article, we introduce SNSPD fabricated from NbN ultrathin superconducting film and lab-based SNSPD system. The characteristics of single photon response pulse of SNSPD are analyzed in detail. Also discussed is the relationship between waveform of single photon response and system bandwidth. Circuit model is made to analyze the performance of SNSPD. The simulation result agrees well with the experimental data. Those results are valuable for understanding the mechanism of SNSPD and building future SNSPD system for quantum communication.

关键词： quantum communication single photon detection superconducting nanowire single photon detector kinetic inductance

Rapid and simple half-quantitative measurement alpha-fetoprotein by poly(dimethylsiloxane) microfluidic chip immunochromatographic assay

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Rapid and simple half-quantitative measurement alpha-fetopro...

Investigation of silicon on insulator fabricated by two-step O+ implantation

2.07亚洲光电子会议微电子机械系统/微型光机电系统技术及应用分会场

作者： Chao Tonga, b, Qinghui Jina, Jianlong Zhaoa a Nano technology Laboratory, shanghai {2. of microsystem and information technology, chinese Academy of sciences, shanghai 2.0050, china b Graduate School of the chinese Academy of sciences, Beijing 100039, china

In this article, a kind of microfluidic method based on MEMS technology combined with gold immunochromatographic assay (GICA) is developed and *** to the traditional GICA,this method supplies us convenient , multi-channel, in-parallel, low cost and similar efficiency approach in the fields of alpha-fetopro-tei (AFP)***, we improved the adhesion between the model material SU-8 and Silicon wafer, optimized approaches of the fabrication of the SU-8 model systematically, and fabricate the PDMS micro fluid chip with good reproduction ***, Surface modification and antibody immobilization methods with the GICA on the PDMS micro fluid analysis chip are studied, we choose the PDMS material and transfer GICA to the PDMS micro fluid chip successfully after researching the antibody immobilization efficiency of different materials utilized in fabrication of the micro fluid *** order to improve the reaction efficiency of the immobilized antibody, we studied the characteristics of micro fluid without the gas drive, and the fluid velocity control in our design;we also design structure of grove to strengthen the ability of immobilizing the antibody. The stimulation of the structure shows that it achieves great improvement and experiments prove the design is feasible.

关键词： immunochromatographic assay alpha-fetopro-tei antibody immobilization Microfluidic chip PDMS

来源： cnki会议评论

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Science Bulletin 2011年第Z1期 444-448页

作者： WEI Xing1,2.XUE ZhongYing1,WU AiMin1,WANG Xiang2.LI XianYuan2.YE Fei2. CHEN Jie2.CHEN Meng2.ZHANG Bo1,LIN ChengLu1,ZHANG Miao1,2.& WANG Xi1,2.1 State Key Laboratory of Functional Material for Informatics,shanghai institute of {2. and information technology,chinese Academy of sciences,shanghai 2.0050,china 2.shanghai Simgui technology Company Limited,shanghai 2.182.,china

In this paper,we investigated the dose window of forming a continuous buried oxide(BOX) layer by single implantation at the implantation energy of 2.0 keV. Then,an improved two-step implantation process with second implantation dose of 3×1015 cm-2.was developed to fabricate high quality separation by implanted oxygen(SIMOX) silicon on insulator(SOI) wafers. Compared with traditional single implantation,the implantation dose is reduced by 18.2.. In addition,the thickness and uniformity of the BOX layers were evaluated by spectroscopic ellipsometry. Defect-free top Si as well as atomic-scale sharp top Si/buried oxide interfaces were observed by transmission electron microscopy,indicating a high crystal quality and a perfect structure of the SOI fabricated by two step implantation. The top Si/BOX interface morphology of the SOI wafers fabricated by single or two-step implantation was also investigated by atomic force microscopy.

关键词： silicon on insulator interface morphology dose window separation by implanted oxygen

X-Ray Diffraction Characterization of the Microstructure in Close-Packed Hexagonal Nano Material

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复旦学报（自然科学版） 2007年第5期46卷 855-页

作者： Pu Zhao-hui1, Yang Chuan-zheng2. Cheng Li-fang1, Gao Jie1,Qin Pei2. Lou Yu-wan2.1.National Engineering and Research Center for Nanotechnology, shanghai, 2.02.7,{2. 2.shanghai institute of microsystem and information technology, chinese Academy of sciences, shanghai 2.0050,{2.) Natiomal Engineering and Research Center for Nanotechnology Shanghai 200237 shanghai institute of {2. and information technology Chinese Academy of Sciences Shanghai 200050

1 Results On the basis of previous work,the general theory,least square methods and computing programs have been proposed and developed,which can separate the two-fold broadening effect caused by crystallite-micro strain,crystallite-stacking faults,strain-faults and which can also separate the three fold broadening effect caused by crystallite-strain-faults in closed-parked hexagonal (CPH) *** method is applied to characterize and investigate the microstructure in β-Ni(OH)2.as negative ma...

关键词： nano material β-Ni(OH)2 ZnO XRD multiple broadening effect

Principles and construction of MSD adder in ternary optical computer

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Science china(information {2.) 2010年第11期53卷 2159-2168页

作者： JIN Yi1, SHEN YunFu1, PENG JunJie1, XU ShiYi1, DING GuangTai1, YUE DongJian1 & YOU HaiHang2.1School of Computer Engineering & Science, shanghai University, shanghai, 2.0072.2. 2.ational institute for Computational sciences, Oak Ridge, TN37831, USA 1. School of Computer Engineering & Science Shanghai University Shanghai 200072 China2. National Institute for Computational Sciences Oak Ridge TN 37831 USA

The two remarkable features of ternary values and a massive unit with thousands bits of parallel computation will make the ternary optical computer (TOC) with modified signed-digit (MSD) adder more powerful and e?cient than ever before for numerical calculations. Based on the decrease-radix design presented previously, a TOC can satisfy either a user requiring huge capacity for data calculations or one with a moderate amount of data, if it is equipped with a prepared adder. Furthermore, with the application of pipelined operations and the proposed data editing technique, the e?ciency of the prepared adder can be greatly improved, so that each calculated result can be obtained almost within one clock cycle. It is hopeful that by employing a MSD adder, users will be able to enter a new dimension with the creation of a new multiplier, new divider, as well as new matrix operator in a TOC in the near future.

关键词： ternary optical computer (TOC) modified signed-digit (MSD) adder pipeline computing data editing technique

Power-efficient topologies for wireless sensor networks with fixed communication range

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Journal of shanghai University(English Edition) 2010年第1期14卷 39-44页

作者：金彦亮缪慧俊王晖葛泉熊勇 Key Laboratory of Special Fiber Optics and Optical Access Networks Shanghai University CNRS-IBISC Research Laboratory University of Evry Val d'Essonne Key Laboratory of Wireless Sensor Network and Communication Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

The expectations for sensor networks are growing. The performance of wireless sensor networks （WSNs） is greatly influenced by their network topology. In this paper, we consider four patterned topologies that best support connectivity among these deployed sensor nodes in two-tiered WSNs. The theoretical and simulation results show that the triangle-based topology has smaller cell number, shorter maximum hop length, less total energy consumption, and better performance than other topologies. The analysis carried out in this paper could provide the guidelines for network deployment and protocol design in the future applications.

关键词： wireless sensor network (WSN) network topology coverage connectivity

微流控芯片电泳分离血清高密度脂蛋白亚类的研究

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生物化学与生物物理进展 2010年第2期37卷 218-223页

作者：郑慧斐丛辉王惠民金庆辉赵建龙南通大学附属医院检验医学中心南通226001 中国科学院上海微系统与信息技术研究所上海200050

描述了一种微流控芯片电泳快速分离血清高密度脂蛋白(high density lipoprotein,HDL)亚类的方法.利用自制的微流控芯片,结合激光诱导荧光检测系统,40mmol/L Tricine、50mmol/L甲基葡胺(MEG)、0.2.mol/LSDS(pH8.5)为样品缓冲液,40mmol/L Tricine、50mmol/LMEG、0.01mmol/L SDS(pH8.5)为分离缓冲液,4min内HDL3和HDL2.种亚类得到基线分离.该法操作过程简单,重复性较佳,测试费用低廉,在临床HDL亚类的检测中具有较好的应用前景.

关键词：微流控芯片电泳高密度脂蛋白分析