基于LabVIEW的变压器绕组发热试验自动测试软件

遵照变压器认证标准GB19212．1（IEC 61558－1）中型式试验的关键项目一发热试验的一般要求,针对试验中最广泛使用的热阻法,并使用常见的离线测试方式和经验公式代入计算法,编写了一套基于LabVIEW开发环境的自动测试软件,构建以图形化软件为核心的下一代自动化测试系统。     

上海市郊区农业土地流转类型与土地利用变化响应差异性研究

在对农业用地流转机制进行深入分析的基础上，将农业土地流转市场划分为三种类型：政府引导型、集体推动型和农户主导型。进而结合农户调查数据，通过建立农业土地非耕地化流转的驱动力模型。分析不同类型的农业土地流转市场对于耕地利用变化的影响。模型运行结果表明：政府引导的农业土地流转导致耕地面积大幅减少，集体推动的流转有利于提高耕地利用效率。农户主导的农业土地流转促使了粮食作物种植面积的减少。最后以模型运行结果为依据，从保护农民土地权益、维持耕地总量平衡的角度提出相关建议。     

利用卫星资料估算我国西北地区直接辐射

在缺乏直接辐射、云量、日照时数等地面观测资料情况下,如何正确估算太阳直接辐射对太阳能合理开发利用有重要意义。利用NCEP/NCAR再分析资料、EOS-AURA卫星和FY-2C气象卫星反演资料,采用一个改进的宽带辐射传输模型对我国西北5个地面辐射站点2006年和2007年直射日曝辐量进行了估算。模型首先在Bird模型基础上对晴空条件下的太阳直接辐射进行了计算,然后结合FY-2C气象卫星总云量和云类反演数据,引入了一个线性方程,对实际天气状况下的直射日曝辐量进行了计算。结果表明:5个站点模拟的直射日曝辐量与实测值均存在较好一致性,评价效率系数NSE介于0.68~0.8,而对月均直射日曝辐量的模拟结果则显示模型在4-10月的估算精度要高于11-3月结果。     

海洋工程用新型牺牲阳极设计与性能研究(Ⅴ)——导管架平台阴极保护设计探讨

目的 针对不同设计使用年限的导管架平台,通过对比新型阳极和常规阳极用量来评价新型阳极的优势和不足。方法 针对设计寿命15年和30年的导管架平台,计算满足不同阶段保护电流需求的新型阳极和常规阳极的需求量。结果 当导管架平台设计年限较短,比如15年,牺牲阳极用量由初期保护电流需求量决定,新型阳极的使用可以达到节约阳极用量的目的。当设计年限较长,比如30年,牺牲阳极用量则由维持电流需求量决定,采用新型阳极并不能节约阳极用量。结论 并非所有设计年限的导管架平台使用新型阳极都能达到节约用量的目的,具体要根据实际计算结果而定。     

Denaturing high-performance liquid chromatography (DHPLC)-based prenatal diagnosis for tuberous sclerosis

Tuberous sclerosis (TSC) is a frequent autosomal-dominant condition (affecting 1 in 6000 individuals) caused by various mutations in either the hamartin (TSC1) or the tuberin gene (TSC2). This allelic and non-allelic heterogeneity makes genetic counseling and prenatal diagnosis difficult, especially as a significant proportion of TSC cases are due to de novo mutations. For this reason the identification of the disease causing mutation is mandatory for accurate counseling, yet current mutation detection methods such as single-strand conformation polymorphism (SSCP) or denaturing gradient gel electrophoresis (DGGE) are labor intensive with limited detection efficiency. Denaturing high-performance liquid chromatography (DHPLC) is a high-throughput, semi-automated mutation detection system with a reported mutation detection rate close to 100% for PCR fragments of up to 800 bp. We used a recently described DHPLC assay allowing the efficient detection of mutations in TSC1 to analyze the DNA extracted from a chorion villus sample in order to perform a prenatal diagnosis for TSC. The fetus was found not to have inherited the deleterious mutation and the DHPLC diagnosis was confirmed by haplotype analysis. This represents the first DHPLC-based prenatal diagnosis of a genetic disease. Copyright © 2001 John Wiley & Sons, Ltd.     

The spatiotemporal structure of population in the Muskrat (Ondatra zibethicus)

The spatiotemporal structure of the muskrat population has been studied by means of the prenatal radioactive marking of juveniles with 45 Ca and their subsequent recapture in the test area. The muskrat population is characterized by a cyclic type of spatial structure, with seasonal transition from a mosaic type of settling to a diffuse type and, after the breeding season, vice versa.     

The characteristic of in situ stress in outburst area of China

In order to obtain the characteristics of in situ stress field in outburst mining area, using the hollow inclusion (HI) technique to measure the in situ stress of coal and gas outburst mining area. The measurement sites located in northeast, middle and east of china, which include eight mining areas such as Fuxin, Pingdingshan, Hebi and Huainan. Base on the analysis of measurement data from outburst mining area, conclusions could be obtained as follow: (a) major principal stress and minor principal stress is horizontal stress and interim principal stress is vertical stress, and the type of outburst area’s stress field is dynamic stress field; (b) the major principal stress and minor principal stress are higher than other regions and the tectonic stress is outstanding; and (c) the ratio of major principal and vertical stress is decrease with the increase of depth and the type of stress field is likely transfer dynamic to static. Thus, in situ stress plays a key role during the occurring and development of coal and gas outburst, which is an important reason of severe outburst in China.     

不同类型喷头灭火有效性研究

通过实验研究了不同类型喷头对灭木垛火的影响。实验采用了ZSTX和ZSTP两种类型喷头,在不同的水压力下灭木垛火,通过实验现场观测和测得的烟气温度,烟气组分变化来分析对比灭火的效果和对烟气的影响。通过对比分析实验数据,可知ZSTX喷头在0.2MPa的水压力下可以实现灭火,ZSTP喷头在0.4MPa才可以实现灭火。喷淋实现灭火时产生的CO比只能实现控火产生的CO少。     

美国海军工作服发展现状

本文主要介绍了美国海军现用的工作服装种类、服装构成及穿着场合,并与我国海军07式作训服进行了对比分析。     

瞬态径向热流法测定松散煤体变导热系数

松散煤体的导热系数是指在单位梯度作用下,松散煤体单位时间内通过单位面积的热量,表征了松散煤体导热性能的强弱,是研究煤自燃的重要参数。目前,使用最广泛的热线法,测试结果易受电阻升温变化影响。针对当前测试方法的不足,本文在二维径向导热模型的基础上,设计了瞬态径向热流法测定松散煤体变导热系数测试装置,并建立了相应的导热系数解算模型。通过测定不同煤样随温度变化的变导热系数。结果表明,随着温度的升高,松散煤体的导热系数不断上升,两者之间基本成线性关系,测试结果符合松散煤体的导热特性。