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Search Results: 1 - 10 of 150992 matches for " 孙振海 "
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一种新的大气稳定度分类方法
Sun Zhenhai
大气科学 , 1998, DOI: 10.3878/j.issn.1006-9895.1998.01.12
Abstract: 提出了一种运用灰色聚类理论对大气稳定度进行分类的新方法,用该方法及上海江湾站1993年1、4、7、10四个月的逐时常规观测资料对当时当地的大气稳定度进行了分类,最后与国标分类法所得结果进行了比较,得到了更优、更合理的类分布,说明该方法是大气稳定度分类中一种简单、实用而且效果更好的新方法。
松嫩草原虎尾草生境大型土壤动物动态特征
The Dynamic Characteristics of Soil Macrofauna in Chloris Virgata Habitat in Songnen Grassland
 [PDF]

立娜, 殷秀琴,, 单昱
Hans Journal of Agricultural Sciences (HJAS) , 2012, DOI: 10.12677/hjas.2012.22004
Abstract:

大型土壤动物是陆地生态系统中的重要组成部分,为探讨松嫩草原虎尾草生境大型土壤动物组成及多样性动态特征,于20065月、7月和9月进行了调查研究,共获得大型土壤动物427只,隶属24922科,优势类群共3类,为象甲科幼虫、步甲科和蜘蛛目,类群数与个体数在各月份间无显著差异。大型土壤动物在垂直分布上具有明显的表聚性,各层与各月间均存在显著差异。大型土壤动物的多样性指数随季节变化不大,其中9月份多样性指数、丰富度指数、优势度指数最大,7月份均匀性指数达到最大值。

Soil fauna play an important role in terrestrial ecosystemsin order to investigate the diversity of soil macrofauna in Chloris virgata habitat in Songnen grassland, investigations were conducted in the western of Jilin Province in May, July and September 2006. A total of 427 individuals, belonging to 2 phylas, 4 classes, 9 orders and 22 families, were obtained. There were no significant differences both in groups and individuals among 3 dominant groups, which were Curculionidae larvae, Carabidae and Araneida. Soil macrofauna was decreasing obviously with the depth of soil layers, and that there were significant differences among layers and months. The seasonal variations of the diversity indices of soil macrofauna were not significant. In these diversity indices, Shannon-Wiener diversity index, Margalef richness index, Simpson dominance index were highest in September, however Pielou evenness index was higher in July.

A New Atmospheric Stability Classification Scheme
一种新的大气稳定度分类方法

Sun Zhenhai,

大气科学 , 1998,
Abstract: In this paper, a new scheme of atmospheric stability classification is provided by the using grey-classification method Based on this method and a large number of routine observational data, the atmospheric stability is classified for a certain sampling station at certain time intervals Finally, the results between by using the grey-classification scheme is compared with those using the method of GB 3840-91 More reasonable distribution of stability was obtaind by the new method It is shown that the grey-classification scheme is a simple, practical and more effective method for classifying the atmospheric stability
地榆现代研究进展
,立立
中国中医药信息杂志 , 2007,
Abstract:
柔性多体系统动力学STIFF微分方程数值积分方法适用性分析
王艺兵,,
力学与实践 , 1997, DOI: 10.6052/1000-0992-1997-113
Abstract: 柔性多体系统动力学微分方程都存在不同程度的STIFF,本文通过大量数值实验分析了几种常用数值积分方法,如四阶Runge-Kuta法、Trenor法、Adams法、Gear法及Newmark法对处理不同STIFF程度的适用性,得到了一些有意义的结论.
多体系统动力学拓扑结构的自动分析与优化
王艺兵,,
力学与实践 , 1997, DOI: 10.6052/1000-0992-1997-145
Abstract: 本文定义了多体系统中各铰的加权因子,并以此为据用传统的图论方法定量地讨论了多体系统派生树的自动生成方法及产生最大计算效率的最小优化树的自动生成方法.
二甲酚橙的分离及其分光光度法测定
,,朱明华
华东理工大学学报 , 1985,
Abstract: 一、前言合成二甲酚橙(XO)至今仍用胺甲基化反应。其所用原料为甲酚红(O—CR)、亚氨基二乙酸(IDA)、乙醛、氢氧化钠和冰乙酸等。所得产品含XO36.3%,半二甲酚橙(SXO)17.2%,其余为副产物及未反应的原料。产品虽经重结晶提纯,但仍含不少的SXO等杂质。以此作
基于形态学建筑物指数的城市建筑物提取及其高度估算
付乾坤,吴波,汪小钦,
遥感技术与研究 , 2015,
Abstract: 通过引入高分辨率影像的形态学建筑物指数和阴影指数,并结合面向对象的地物信息提取思想,准确地提取出城市建筑物及其阴影,进而实现了城市建筑物的高度估算。首先,利用形态学建筑物指数的多方向多尺度特征,将建筑物与邻近光谱相似的道路目标进行分离;其次,采用双阈值策略提取建筑物与相应的阴影,进一步提高了建筑物的提取精度;最后,根据成像时刻卫星和太阳的高度角、方位角,建立建筑物阴影长度与建筑物高度的估算模型。试验利用厦门市思明区软件园资源三号(zy\|3)数据进行城市建筑物提取及其高度估算,证实该方法能够较准确地估算出建筑物的高度信息,并且比基于svm的监督分类方法具有更高的建筑物提取精度,建筑物高度估算的中误差可达±1m。
基于夹杂-细晶粒区-鱼眼疲劳失效的超长寿命预测模型 Aprediction model for the very high cycle fatigue life for inclusion-FGA (fine granular area)-fisheye induced fatigue failure
,李伟,,张震宇
- , 2017,
Abstract: 本文旨在研究夹杂-细晶粒区-鱼眼诱发疲劳失效的超长寿命预测模型.基于Cr-Ni-W合金钢疲劳试验结果,结合局部应力-寿命法和位错-能量法,分别构建了局部裂纹萌生寿命模型(LCIL)和考虑夹杂及细晶粒区影响的裂纹萌生寿命模型(IFCIL),并与Tanaka-Mura模型(T-M)进行了对比分析.其次,分别对细晶粒区内的小裂纹扩展行为和细晶粒区外鱼眼内的长裂纹扩展行为进行建模,最终形成了包含裂纹萌生和扩展在内的全寿命预测模型.结果表明,考虑夹杂及细晶粒区影响的裂纹萌生寿命模型(IFCIL)有较高的预测精度;对应细晶粒区的裂纹萌生寿命几乎等同于全寿命;裂纹扩展寿命仅占据全寿命很小的一部分;预测结果全部处于2倍偏差以内,即全寿命模型可有效地用于夹杂-细晶粒区-鱼眼诱发失效的超长寿命预测.
双绕组发电机交流侧带负载直流侧突然短路分析
俊忠,马伟明,,
中国电机工程学报 , 2005,
Abstract:
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