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.     

基于MC13233的ZigBee物理层分析与设计

以Freesacle公司的ZigBee RF4CE芯片MC13233为基础,依据嵌入式硬件构件的规范设计了硬件各模块。介绍MC13233的ZigBee物理层的模型。详细阐述MC13233的ZigBee物理层的设计方法,具体实现RF收发器的工作模式设置、物理层数据收发、CCA/ED/LQI,并给出了物理层正确性和可靠性测试。     

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.     

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.     

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。     

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。     

入侵检测系统中的一种免疫遗传算法

在入侵检测系统中，为了有效防止各种形式的入侵行为，引入了生物学中的免疫特性，讨论了一个能检测较大范围网络入侵的免疫遗传学算法，并在一个新的模式识别器中引入了遗传算法的相关知识。     

预浸水法消除大厚度自重湿陷性黄土地基研究

为了在大厚度自重湿陷性场地建筑水利工程，基本消除黄土的湿陷性，通过在宁夏固海扩灌十一泵站场地进行预浸水的试验研究，观测了湿陷量与浸水时间关系、耗水量与浸水时间关系、场地变形量，以及处理效果检测与评价，得出大厚度自重湿陷性黄土场地经过一定的预浸水后，黄土自重湿陷量全部消除．地基呈中压缩性，承栽力特征值为150kPa的结论．为同类工程建设提供可以借鉴的经验．