SystemView在数字信号传输模型设计与仿真分析中的应用研究

文章研究了数字信号传输的模型,较详细地讨论了升余弦频谱过渡特性滤波器的数学机理。运用SystemView软件对该系统模型的电路实现进行了设计分析。对该系统性能从时域、功率谱等视角进行了实验研究,验证了所设计电路系统的正确性。     

基带信号QPSK调制与脉冲成型滤波器ASIC实现

WCDMA基带处理器上行方向采用QPSK调制方式与根升余弦脉冲成型滤波器产生3GPP WCDMA协议25.213 Release6中规定的基带信号.文章介绍了QPSK调制与此同时脉冲成型的基本原理,并给出了该调制方式与成型滤波器的ASIC设计.     

楔横轧时的缺陷及解决方法

楔横轧时生产的缺陷，基本上分为两类——外表面的和内部的。外部缺陷有压折、由模具造成的螺旋状凸痕、轧制部分的形状不正确（锥度、椭圆、凸腹）、尾部未轧或者弯曲、尾部缩孔等；内部缺陷有中心疏松和孔腔。文中对各种缺陷的成因及解决办法进行了分析阐述。     

Individual differences in the responses of na?ve rhesus monkeys to snakes.

The authors demonstrated individual differences in inhibited behavior and withdrawal responses of laboratory-born rhesus monkeys when initially exposed to a snake. Most monkeys displayed a small significant increase in their behavioral inhibition in the presence of a snake. A few monkeys had marked responses, and some actively withdrew. Although the responses of the most extreme laboratory-born monkeys were comparable to feral-born monkeys, the responses of the laboratory-born monkeys rapidly habituated. The individual differences in the responses of naive monkeys likely reflect a continuum from orienting to wariness to fear. A neurobiological model is presented that addresses potential mechanisms underlying these individual differences, their relation to fear, and how they may predispose to phobia development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

羊毛珍珠绒系列产品的设计与开发

主要介绍了羊毛珍珠绒系列产品的设计、开发方法和思路，突出了原料交叉、组织结构变化和工艺的融合，赋予了产品珍珠般的花型、光泽及高贵感。     

多元凸函数的特征

把一元凸函数的特征推广到多元凸函数中去,拓展了其应用范围.     

北洺河铁矿主溜井的施工技术

北Ming河铁矿主溜井具有围岩不稳定、含水量大、透水性好等特点，给施工带来诸多因素，面临溜井的施工工期短、任务重、确保工程质量，采用了特殊的注浆封堵井筒的渗漏水、导井反井钻进、钻爆法刷大井筒断面等施工技术，已取得了较好的施工效果。     

20kV及以下变电所布置探讨

从配变电设备的维护结构及进出线连接方式、规范对操作通道及维护通道的要求入手,结合国内外设计经验,提出几种占地面积较小的20 kV及以下变电所布置方案:柜前维护方案、架空地板等。认为通道尺寸的确定以最小要求的操作通道、维护通道为基础进行。     

宣钢储料场治理扬尘污染实践

针对宣钢炼铁厂储料场堆放的粉状料种多、大风天气造成扬尘污染的情况,经多次小型试验和工业试验后表明,用宣钢炭黑附企扬尘抑制剂治理扬尘污染经济效益显著、简便可行.     

Nutrient recycling potential in rice–vegetable cropping sequences under in situ residue management at mid-altitude subtropical Meghalaya

Low native soil nitrogen (N) and very low phosphorus (P) coupled with apathy of farmers towards use of fertilizer are the major constraints limiting rice productivity in the North Eastern Hill (NEH) Region of India. Field experiment was undertaken in narrow valley wetland during Kharif and pre-Kharif (rainy) seasons of 2003, 2004, and 2005, respectively, at Umiam (950 m MSL), Meghalaya to evaluate the nutrient recycling and production potential of rice (Oryza sativa L.)—vegetables cropping sequences under low input in situ residue management under rainfed conditions. After rice, five vegetable crops, viz. tomato (Lycopersicon esculentum Mill), potato (Solanum tuberosum L.), frenchbean (Phaseolus vulgaris), cabbage (Brassica oleracea L. var. capitata), and carrot (Daucas carota L.) were grown during pre-kharif season on temporary raised and sunken beds. Minimum tillage was given to both rice and vegetables. No external input including fertilizer, organic manure, pesticides, etc. were applied to either crops. Only the economic parts of the crops were harvested and the rest of the biomass of the entire crop and weed residues were chopped and incorporated into the soil. Among the five cropping sequences, rice–tomato gave the highest rice equivalent yield (214.40 q/ha), followed by rice–carrot (206.4 q/ha). Highest net return (rupees [Rs.] 66,635 ha⁻¹) was recorded in rice–carrot, closely followed by rice–tomato (Rs. 66,139 ha⁻¹). Rice–cabbage and rice–frenchbean were found to be on a par with each other in terms of yield and income. The highest amount of NPK recycling was recorded for the rice–potato sequence. Weed biomass production in the different sequences ranged from 37.5 q/ha for rice–tomato to as high as 50.6 q/ha in the case of rice–fallow. Soil fertility in terms of available NPK status was found to be stable in all the crop sequences except rice–cabbage, where fertility status declined slightly. The soil biological properties such as population of Rhizobium, bacteria, phosphorus-solubilizing microorganisms, and earthworm activity were all found to be remarkably higher in the experimental field compared to other adjacent plots that are managed inorganically. It was concluded that vegetables such as tomato, carrot, potato, etc. could be profitably grown after rice without the addition of fertilizer and manure, if residues are managed effectively under temporary raised beds without deteriorating soil fertility.