Blind equalization and sequence estimation using Markov chain Monte Carlo methods

This paper discusses the problem of restoring a digital input signal that has been degraded by an unknown FIR filter in noise, using the Gibbs sampler. A method for drawing a random sample of a sequence of bits is presented; this is shown to have faster convergence than a scheme by Chen and Li, which draws bits independently. ©1998 IEEE.

The Malaysian experience

Integrated farming has long been practiced in Malaysia, not only to provide protein requirements needed by the family, but also as a source of income. With fish being promoted on a larger scale, the Malaysian government is providing farmers with financial assistance and hands-on training on fish culture and rice production. Systems of fodder-fish integrated farming and fish-livestock farming in mine ponds are outlined.

一种抗抑郁药物及其应用

提供一种抗抑郁药物，含有苔黑酚-1-氧-β-D-葡萄糖吡喃苷或苔黑酚及其衍生物及可药用载体和/赋形剂，以及它在制备抗抑郁药物中的应用和在制备功能食品中的应用。

四膜虫:毒理学与生态毒理学研究中的优良模式生物

四膜虫 (Tetrahymena)是毒理学与生态毒理学研究的良好模式生物之一。本文回顾了近年来以四膜虫为实验生物开展的毒理学与生态毒理学研究进展 ,并针对目前产生严重环境压力的持久性有毒化学污染物 ,提出了以四膜虫为模式生物开展相应的生态毒理学研究的前景以及可行的方法。

Carrier concentration profiling in magnetic GaMnSb/GaSb investigated by electrochemistry capacitance-voltage profiler

Depth profiles of carrier concentrations in GaMnSb/GaSb are investigated by electrochemistry capacitance-voltage profiler and electrolyte of Tiron. The carrier concentration in GaMnSb/GaSb measured by this method is coincident with the results of Hall and X-ray diffraction measurements. It is indicated that most of the Mn atoms in GaMnSb take the site of Ga, play a role of acceptors, and provide shallow acceptor level(s).

Effects of Hydrogen Plasma Treatment on the Electrical and Optical Properties of ZnO Films: Identification of Hydrogen Donors in ZnO

Wurtzite ZnO has many potential applications in optoelectronic devices, and the hydrogenated ZnO exhibits excellent photoelectronic properties compared to undoped ZnO; however, the structure of H-related defects is still unclear. In this article, the effects of hydrogen-plasma treatment and subsequent annealing on the electrical and optical properties of ZnO films were investigated by a combination of Hall measurement, Raman scattering, and photoluminescence. It is found that two types of hydrogen-related defects, namely, the interstitial hydrogen located at the bond-centered (H-BC) and the hydrogen trapped at a O vacancy (H-O), are responsible for the n-type background conductivity of ZnO films. Besides introducing two hydrogen-related donor states, the incorporated hydrogen passivates defects at grain boundaries. With increasing annealing temperatures, the unstable H-BC atoms gradually diffuse out of the ZnO films and part of them are converted into H-O, which gives rise to two anomalous Raman peaks at 275 and 510 cm(-1). These results help to clarify the relationship between the hydrogen-related defects in ZnO described in various studies and the free carriers that are produced by the introduction of hydrogen.

首都圈数字地震台网对微弱爆破信号的检测能力

利用首都圈数字地震台网接收人工地震信号，进行地下结构研究具有重要意义．但人工震源释放的能量小，激

古油松年轮记录的沈阳地区300年来的气候变化

本研究通过对沈阳清•昭陵、清•福陵和千山风景区树木年轮气候学考察和取样，共采集了103株古油松样本的树芯和轮盘。依据树木年轮气候学研究的规范做法建立了3地区的STD, RES, ARS三种类型的树轮宽度年表9个。并分析了不同采样点树木年轮所反映的气候信息，在此基础上重建了该区域近300年来的气候变化，开展了区域以及全球气候变化对比研究，以探讨沈阳地区近300年来气候变化的特点、规律和机制： （1）古油松年表与冬季和初春低温的关系较明显，1月的低温最显著，3种年表与冬季、春季和秋季的降水量的相关性均较显著。水汽压、相对湿度在入冬前、生长后期和易发生春旱的5-6月份对年轮宽度的影响表现突出。蒸发是上年全年、当年全年和当年绝大部分月份对油松生长起负效应的因素，其中5月最明显，但1、2月的蒸发量与油松当年的年轮宽度表现出正相关。油松年表的窄轮和窄化突变佐证了1650年以来的35次主要的旱灾年历史记录和59次干旱记录。 （2）本研究成功地检验了沈阳地区古油松年轮宽度年表对太阳活动，地磁活动，太平洋十年震荡和全球气温变化的响应。年轮宽度与这些影响因子均存在共同的周期变化和显著的线性关系。其中，年轮宽度对过去太阳活动和地磁的活动呈明显负相关关系，而且是多种抑、促效应的复合。所有结果表明沈阳城市古油松适于监测极度的诸如El Niño (La Niña)事件的全球环境变化和区域环境异常。 （3）本研究重建了沈阳地区1710-2004年12-1月的极端最低温，并指出其主要低温波动期，高温波动期；重建了沈阳地区1780-2004年1-6月的降水量，并统计了降水量反映的偏湿年份,，偏干年份；同时，分别重建了沈阳地区1780-2004年的年均水汽压、年蒸发量和年均相对湿度，并指出各重建结果所表征的旱涝年份。