利用光纤非线性环镜实现8×2.5Gb/s→2.5Gb/s解复用及误码特性的测量

报道了利用３ｋｍ 光纤非线性环镜作为全光解复用器对８×２５Ｇｂ／ｓ光时分复用信号的解复用实验结果, 并对２５Ｇｂ／ｓ解复用信号进行了误码特性的测量。测量结果表明误码率可达到１０－ １１, 误码率为１０－ ９时的功率代价仅为１４ｄＢ。     

4×10Gbit/s光时分复用(OTDM)系统中基于电吸收调制器(EAM)的光分插复用器

提出了一种光时分复用 (OTDM )系统中完全基于电吸收调制器的光分插复用器(O ADM ) ,该复用器具有简单的结构和灵活上下话路的能力。然后对实现这种O ADM所需要的关键技术进行了分析和讨论。     

恒栅流负电晕充电的Si基SiO2驻极体的电荷稳定性

本文讨论了在不同充电参数条件下的恒恒流电晕充电的Ｓｉ基ＳｉＯ２薄膜驻极体的空间电荷储存稳定性,并和栅控恒压电晕充电的结果进行了比较。利用电容－电压（Ｃ－Ｖ）分析技术确定了空间电荷重心的漂移,并利用等温表面电位衰减测量,开路热刺激放电实验及Ｃ－Ｖ分析技术讨论了Ｓｉ基ＳｉＯ２薄膜驻极体的空间电荷储存和输动特性。     

迫流冷却超导磁体稳定裕量的计算模型

用管中电缆型超导体（CableinConduitConductor─—CICC）绕制大型磁体或快脉冲磁体是当今主流。冷却方法可选择超临界氦（He－I）或超流氦（He一Ⅱ）迫流。讨论了这类磁体用He－I冷却稳定裕量计算的三种简化数学模型：能量平衡、零维和一维模型;还指出了He一Ⅱ冷却稳定裕量计算的特殊性;与稳定裕量计算密切相关的超导电缆束向致冷剂的瞬志传热,取决于固液界面的卡皮查热阻和He－I边界层的热阻。     

基于DSP的HDTV实时码流合成器实现

论述了MPEG2码流系统级的语法以及码流合成应作的语法处理。介绍了采用DSP为核心 ,配合EPLD通过软件实现的实时码流合成器设计 ,并给出了实现框图。采用高可靠性设计 ,成功地实现了国内第一个实时条状码流合成器。经过现场实际应用证明 ,其具有很高的可靠性和灵活性。     

基于DSP和HDTV实时码流合成器实现

论述了MPEG2码流系统级的语法以及码流合成应作的语法处理，介绍了采用DSP为核心，配合EPLD通过软件实现的实时码流合成器设计，并给出了实现框图，采用高可靠性设计，成功地实现了国内第一个实时条状码流合成器，经过现场实际应用证明，其具有很高的可靠性和灵活性。，     

YAMAHA DSP—A1——超级DD／DTSAV功放

自从YAMAHA公司在两年前推出DSP－A3090杜比数字AV放大器以后,市场反应强烈。对此,日本其它生产AV放大器的各大生产厂商很快推出高档次的杜比数字（DD）AV放大器来抢占市场。这些后起之秀在设计上超过了YAMAHA的A3090,尽管售价较高,但仍十分好卖。对此,YAMAHA考虑到DTS（数字影院系统）的DVD碟片会在98年底之前小批量上市,于是该公司及时推出了DSP－AI超级DD／DIS合并式功放。正是由于其优异的功能,DSP－AI赢得了’97大奖赛金奖。下面就这款AV功放的特色、外观、声音表现力评价及测试结果作一简介。DSP－AIf…     

Clausing-Nawyn方法的扩展及应用实例

扩展了Clausing－Nawyn方法，阐述了稳态分子流基本方程的普适意义，指出入射率是比真空度更重要的参量。用该方程计算“原位Micro－VCM装置”的可凝挥发物（VCM）收集率，得到了满意的结果。     

应用于主动噪声控制的实时DSP系统

本文基于实时数字信号处理系统理论，讨论主动噪声控制系统的电子设计方法。通过对控制时序的分析，设计了一实时多通道自适应控制系统，该系统以PC为主控机，以DSP TMS320－C30为从处理机，具有多路传感器同时输入和扬声器同时输出通道。该系统被应用于国产某型螺桨飞机的舱内噪声控制，取得了满意的降噪效果。     

高性能双波段图像融合处理机

报道了自主研制成功的以TMS320C6201数字信号处理器（DSP）为核心的高速数字图像融合系统。由于采用了最新高性能DSP及多种硬件、软件方面的优化结构设计，因此该系统可以灵活地应用多种融合算法实现可见光－－长波红外双通道数字图像的实时或准实时融合处理，同时具备手动的像素平移配准功能，为实用化多通道实时图像融合处理机的研制工作奠定了良好的技术基础。     

车辆用钢板弹簧的可靠性优化设计

 介绍了车辆不同厚度钢板弹簧的可靠性优化设计方法在基本随机变量的概率特性已知的情况下，运用二阶矩法和约束随机方向法对钢板弹簧进行了可靠胜优化设计，编制了实用的计算机程序，迅速准确地得到了钢板弹簧的可靠性优化没计信息．     

Using Hands‐On Design Challenges in a Product Development Master's Degree Program

A design challenge has been developed as the first experience in a new Master's degree program in product development, offered by a consortium of schools: the Massachusetts Institute of Technology, the Rochester Institute of Technology, and the University of Detroit Mercy. The program admits experienced technical specialists who have been identified by their employers as future leaders of product development. The program begins with a brief, intense design challenge that exposes the students to a multi‐disciplinary problem and initiates reflection on systems architecture and organizational processes. The unique requirements of hands‐on design challenges for graduate education in product development are discussed from a constructionist viewpoint. Implementation details of the design challenge are presented and the results from the first two years are analyzed. Students in the program rate the design challenge as a very good introduction to the program and agree that the exercise provides material for discussion of system architecture and organizational processes.     

Router design for nano‐communication using actin quantum cellular automata

Logic expressions can be designed from actin filaments. It is a protein that makes the cellular structure and plays an important role in intracellular communication. Nano communication technique has been established using actin cellular automata. Among several rules, (1, 30) and (4, 27) rules have been used to design 2 to 1 multiplexer, 4 to 1 multiplexer, 1 to 2 demultiplexer and 1 to 4 demultiplexer. Router or data selector has been made of using multiplexer and demultiplexer. Three novel circuits such as multiplexer, demultiplexer and nano‐router have been designed using the projected mechanism. The primary focus of this proposed technique is on different designs of the multiplexer, demultiplexer and minimum cell count with minimum time steps. The different router circuits have been simulated with the help of Simulink by which output has been verified for different circuits. Stuck at fault analysis is also done in this study. Device density and power consumption have also been included in this study. A comparative analysis of the different designs of the router provides a better concept of circuit optimisation. Furthermore, this study analyses convenient forthcoming applications in nano‐technology and nano‐bio‐molecular systems involving the proposed parameters.Inspec keywords: cellular automata, demultiplexing equipment, proteins, logic circuits, logic design, telecommunication network routing, nanocommunication (telecommunication), nanoelectronics, multiplexing equipmentOther keywords: nanocommunication technique, actin cellular automata, 2 to 1 multiplexer design, data selector, multiplexer demultiplexer, actin‐based cellular automata, logic circuits, multiplexer cell count, demultiplexer cell count, minimum cell count, minimum time steps, router circuits, circuit optimisation, nanotechnology, nanobiomolecular systems, actin quantum cellular automata, logic expressions, actin filaments, cellular structure, intracellular communication, logic implementation, 4 to 1 multiplexer, 1 to 2 demultiplexer, 1 to 4 demultiplexer, nanorouter design, Simulink, stuck at fault analysis, device density, power consumption     

Multiplexed Readout of MMC Detector Arrays Using Non-hysteretic rf-SQUIDs

Metallic magnetic calorimeters (MMCs) are widely used for various experiments in fields ranging from atomic and nuclear physics to X-ray spectroscopy, laboratory astrophysics or material science. Whereas in previous experiments single pixel detectors or small arrays have been used, for future applications large arrays are needed. Therefore, suitable multiplexing techniques for MMC arrays are currently under development. A promising approach for the readout of large arrays is the microwave SQUID multiplexer that employs non-hysteretic rf-SQUIDs to create a frequency shift of high \(Q\) resonators that is in accordance with the detector signal and that can be monitored by using standard microwave measurement techniques. In this paper we discuss the design of a recently developed and fabricated 64 pixel detector array with integrated microwave SQUID multiplexer that was produced to test the suitability of this readout technique. The characterization of dc-SQUIDs with virtually identical washer design compared to the rf-SQUIDs of the SQUID multiplexer revealed that the crucial SQUID parameters such as the critical current of the Josephson junctions or the washer inductance are close to the design values and anticipates a successful operation of the SQUID multiplexer.     

套管换热器传热过程强化实验系统的研制

多套管式换热器结构简单,清洗、维修方便,易实现加工制作,提出多套管式换热器对套管换热器进行传热强化.在设定条件下编写程序,对多套管换热器进行优化设计,计算显示在相同条件下多套管式换热器与单套管换热器相比传热系数有较大的提高.系统中设置回热器,有效节约能源.该系统在有余热、废热可以利用的场合节能效果更加显著.     

A Time-Domain Sub-Micro Watt Temperature Sensor With Digital Set-Point Programming

To realize the on-chip temperature monitoring of VLSI circuits, an accurate time-domain low-power CMOS thermostat based on delay lines is proposed. Contrary to the voltage-domain predecessors, the proposed circuit can benefit from the performance enhancement due to the scaling down of fabrication processes. By replacing R-string voltage division and voltage comparator with delay line time division and time comparator, only little static power is consumed. The power consumption and chip size can be reduced substantially. Without any bipolar transistor, the temperature sensor composed of a delay line is utilized to generate the delay time proportional to the measured temperature. Instead of a conventional voltage/current DAC or an external resistor, a succeeding multiplexer (MUX) along with a reference delay line is used to program the set-point. The test chips with mixed-mode design were fabricated in a TSMC CMOS 0.35-mum 2P4M digital process. The chip area is merely 0.4 mm². The effective resolution is around 0.5degC with a 256-to-1 multiplexer and -40degC ~ 80degC nominal temperature range. The achieved measurement error is within plusmn0.8degC for a total of 20 packaged chips over the temperature operation range of commercial ICs. The power consumption is 0.45 muW per conversion and a measurement rate as high as 1 MHz is feasible when necessary.     

Low through channel loss wavelength multiplexer using multiple transmission volume Bragg gratings

We describe a wavelength multiplexer design that employs multiple transmission volume Bragg gratings written in the same region of a photosensitive glass having a through channel loss of < 0.5 dB. A two-channel multiplexer for wavelengths of lambda = 1310 and 1550 nm is demonstrated to test our design methods and assumptions. Agreement between simulation and experiment is within 0.2 dB at the peak diffraction efficiency. Grating apodization is used to reduce the interchannel cross talk from (13.5 +/- 0.5) to (41.5 +/- 8.5) dB, with an experimental through channel loss of (0.6 +/- 0.2) dB. Effects of angular dispersion on diffraction efficiency and grating spectral shape due to the finite diameter of the incident reading beam are also analyzed.     

基于折痕特性的柔性结构展开过程分析

研究展开过程中的折痕特性,并在弹簧质点系统基础上,提出一种基于折痕展开特性的简化分析模型,将平行折叠的柔性结构转化为折痕上的质点及连接的弹簧．分析了折痕刚度对展开的影响,给出完全展开的判定准则及通用拓扑关系,并推导了理想展开时点的运动轨迹．应用本模型对正四边形柔性结构在边框张拉受力下进行展开分析,利用自编程序通过特定功能模块实现非理想展开过程仿真．仿真展开过程与理论轨迹基本相符,验证了分析模型的合理性．并对展开过程中的受力、变形进行分析,探讨了折痕刚度对模型展开的影响．拓展了弹簧质点系统的应用范围,为柔性结构的分析、建模及仿真给出建议．     

Design and fabrication of a glass waveguide optical add-drop multiplexer by use of an amorphous-silicon overlay distributed Bragg reflector

We report the fabrication of a distributed Bragg reflector (DBR) on a silver ion-exchanged glass waveguide with a patterned overlay of sputter-deposited amorphous silicon (a-Si). Using this high-refractive-index overlay DBR technology, we demonstrate a fully functional glass-integrated optic add-drop multiplexer (OADM). The OADM consists of a Mach-Zehnder interferometer (MZI) containing overlay DBR gratings in both arms. The design, fabrication, and characterization procedures of the sputter-deposited a-Si overlay DBR and the ion-exchanged glass waveguide MZI are discussed in detail. The completed 3-cm-long OADM exhibited a 24-dB transmission dip with a 3-dB bandwidth of 0.5 nm. The 1-cm-long a-Si overlay DBR induced an additional attenuation of 1.2 dB. A simplified method for overlay DBR fabrication that utilizes a lift-off technique is also proposed and demonstrated.     

正交各向异性蜂窝材料多功能优化设计

以矩形蜂窝为例 , 介绍了正交各向异性蜂窝填充的夹层蜂窝结构散热性能和散热2承载性能优化设计 ,给出了正交各向异性蜂窝相关系数的推导过程。从实际应用出发 , 针对常规以性能乘积形式构造的散热2承载性能指标对散热性能侧重程度的不足 , 给出了基于 2种双层规划模型的非确定性设计方法 , 得到了旨在强调散热性能设计意图的散热2承载多目标优化问题的有效解集。这种方法对结构敏感参数较多的正交各向异性蜂窝填充结构的多功能优化设计非常有效。最后讨论了不同尺寸效应下的蜂窝最优结构参数。