新的相互正交二元零相关区序列集构造法

提出了一种基于任意相同阶的Hadamard矩阵,交织递归构造相互正交二元零相关区序列集的新方法,构造的序列集能达到二元零相关区序列集的理论界.利用参数矩阵对Hadamard序列进行加权,经交织递归构造出零相关区序列集,集合内序列数量是Hadamard矩阵阶数的2倍,且序列集间满足相互正交关系.构造结果表明,参数矩阵取值的多样性可提高相互正交零相关区序列集的数量,能获得大量新的相互正交二元零相关区序列集,为准同步码分多址系统提供更多便于硬件实施的二元地址码集.     

Optical sensing of biomolecules using microring resonators

A biosensor application of vertically coupled glass microring resonators with Q/spl sim/12 000 is introduced. Using balanced photodetection, very high signal to noise ratios, and thus high sensitivity to refractive index changes (limit of detection of 1.8/spl times/10/sup -5/ refractive index units), are achieved. Ellipsometry and X-ray photoelectron spectroscopy results indicate successful modification of biosensor surfaces. Experimental data obtained separately for a bulk change of refractive index of the medium and for avidin-biotin binding on the ring surface are reported. Excellent repeatability and close-to-complete surface regeneration after binding are experimentally demonstrated.     

IPTV中组播技术的解决方案

文中介绍了IPTV业务的概念,分析了实现IPTV业务的播技术,并讨论了将组播隧道技术和应用层组播技术应用到IPTV中的解决方案.     

Numerical Analysis of Coaxial Double Gate Schottky Barrier Carbon Nanotube Field Effect Transistors

Carbon nanotube field-effect transistors (CNTFETs) have been studied in recent years as a potential alternative to CMOS devices, because of the capability of ballistic transport. The ambipolar behavior of Schottky barrier CNTFETs limits the performance of these devices. A double gate design is proposed to suppress this behavior. In this structure the first gate located near the source contact controls carrier injection and the second gate located near the drain contact suppresses parasitic carrier injection. To avoid the ambipolar behavior it is necessary that the voltage of the second gate is higher or at least equal to the drain voltage. The behavior of these devices has been studied by solving the coupled Schrödinger-Poisson equation system. We investigated the effect of the second gate voltage on the performance of the device and finally the advantages and disadvantages of these options are discussed.     

高测速双频激光干涉仪及其性能检测

新型驱动电机和高速传动器件的发展使得数控机床和三坐标测量机等的运行速度已经达到1000mm/s，而目前商用外差干涉仪的测量速度不能完全满足这一要求。为此，研制了一种基于5MHz频差双频激光器的高测速干涉仪，理论上的最高测量速度可达1580mm／s。通过实验对测量速度和计数频率进行了检测，结果证明，这种干涉仪可以达到的最高测量速度为980mm／s，外触发计数频率达11kHz。     

Contractor as Trust Initiator in Construction Partnering—Prisoner’s Dilemma Perspective

Partnering has been advocated for use in construction as a project-delivery approach to curb dispute and enable a cooperative contracting environment. Successful construction partnering is perceived to derive benefits to both developers and contractors. In view of significant implications to successful project delivery, there has been a surge of research and studies on construction partnering. These studies typically focus on the partnering process as well as the identification of critical success factors. Among the various success factors that underpin partnering success, establishing trust among partners is considered the most important. Moreover, skeptics have been swift to point out that establishing trust in construction is daunting. A better understanding of the role of trust and its manifestation in partnering efforts is therefore of both academic and practical value. In this study, motivating trust in construction partnering is described within the classic framework of “the prisoner’s dilemma,” which suggests the trust cycle can be kick-started if construction partners put cooperation before competition and self-interest. This paper reports a study that is designed to suggest a suitable candidate for the trust initiator. As such, the critical trust factors for two groups of construction partners in Hong Kong—developers/consultants and contractors—are first identified. It is found that “performance” and “permeability” of partners are the two most critical trust factors. “Performance” describes the partner’s competence and problem-solving ability as perceived by their counterpart. “Permeability” reflects the partner’s openness in sharing information. The result of a multiple-regression analysis further suggests that the contractor is in a position to initiate trust through competent performance and maintaining effective communication with the client. In this manner, the trust cycle can expand with reciprocal trustworthiness from the client.     

Evaluation of a Computer-Assisted, 2-D Virtual Reality System for Training People With Intellectual Disabilities on How to Shop.

Objective: To evaluate the effectiveness of a 2-D virtual reality (VR) program for training people with intellectual disabilities to shop. Study Design: Pretest and posttest quasi-experimental design. Participants: Sixteen persons with intellectual disabilities (age 17-23 years; IQ = 40-54). Intervention: A VR program or a conventional program training them in supermarket-shopping skills. Main Outcome Measure: Checklist for supermarket-shopping skills. Results: Participants in both training groups showed significant improvement. There was no significant difference in effectiveness between the two methods. Conclusions: The VR program appears effective in training people with intellectual disabilities in an important community living skill. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

一种保护特性分析新方法

继电保护的实际动作行为既取决子所采用的保护原理，也与保护装置所采用的具体实现技术密切相关。本文讨论了如何利用微机故障录波数据进行保护特性分析，对保护动作情况进行检测判断的方法；系统介绍了软件的设计原则、主要功能、所采用的主要分析和计算方法以及软件的基本程序流程等。     

Object-oriented CAD for Hydraulic Circuits of Pressing Machines

１ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｅｘｐｅｒｔｓｙｓｔｅｍｓａｐｐｒｏａｃｈｉｓｃｕｒｅｎｔｌｙｂｅｉｎｇａｐｐｌｉｅｄｔｏｃｏｍｐｕｔｅｒ－ａｉｄｅｄｄｅｓｉｇｎ（ＣＡＤ）ｆｏｒｓｉｍｐｌｅｈｙｄｒａｕｌｉｃｃｉｒｃｕｉｔｓ．Ｍｏｓｔｏｆｔｈｅｅｘｐ...     

锂离子电池电解质盐双草酸硼酸锂的研究进展

介绍了双草酸硼酸锂(LiBOB)的基本性质,综述了LiBOB合成方法和应用情况,并对LiBOB与石墨负极匹配、高温稳定性、在溶剂中的溶解性、电导率和安全性等问题进行了论述,对研究方向也进行了简单的阐述。