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Search Results: 1 - 10 of 99397 matches for " 赵虹 "
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ANALYTICAL RESULT OF TRACE ELEMENTS IN OSTRACOD SHELLAS INDICATORTO RECONSTRUCT PALAEOENVIRONMENT
介形类壳体无机成份的定量分析及其指相意义


海洋科学 , 1987,
Abstract: Trace chemical elements of forty-six ostracod shells have been accurately measured by using SEM with electron probe. According to their living environments and geological age, the specimens Leguminocythereis sp., Neomonoceratina sp., Abrotocythere quadricornis, A. ovata, A. plegadis, Cyprinotus sp., Jlyocypris sp., I. caohaiensis, I, weiningensis, I. bradyi, I. subbiplicata, Leucocythere plena, Limnocythere (Xinanolimnocythere)tribulosa, Hungarocypris sp., and Notodromas sp., can be divided into four groups: living marine ostracod group, living nonmarine ostracod group, fossil marine ostracod group and fossil nonmarine ostracod group. The living ostracods were collected from the South China Sea, Bohai Sea, East Lake in Wuhan Cith, Caohai Lake in Guizhou Province and a pool near the Daqing City, Heilongjiang Province, while the fossil ostracods were from the Tertiary and Quaternary strata in Jiangsu and Guizhou Provinces. The result reveals that the ostracod shells contain 9 kinds of chemical elements, calcium(Ca), aluminium (Al), iron (Fe), magnesium (Mg), potassium (K), chlorine (Cl), sulpher (S), sodium (Nay and barium (Ba) in the order of their value of content from high to low, in which the calcium is the most abundant (32-34%) and the total amount of all other trace elements is less than 10%. It is found that there is an obvious difference between the ostracods living in the sea and those in the fresh-water in their chemical content of shells. This paper deals with the difference to deduce the palaeoenvironment of fossil ostracods where they once lived in. Based on the available data, it is considered that the value of Ca/Mg, the frequency and average value of trace elements in ostracod shells are very significant in the recons-tructionof palaeoenvironment. In general, Ca/Mg of the marine ostracod shells is below 60, while that of nonmarine ones is above 80. The value of Ca/Mg between 50-90 indicates that the ostracods probably lived in the oligohaline environment. Ca, Mg, Si and Al of the marine ostracod shells occurred in the frequency of 100%. On the contrary, all element of nonmarine ones but Ca occurred less than 50%. In addition, the average value of magnesium and potassium in marine ostracod shells is six or seven times higher than that in nonmarine ones, while the average value of calcium and chlorine is rather different, the former being much lower than the latter. The analytical result of chemical content of ostracod shells helps throw light on the cause of different colors on ostracod shells and the process of their formation. Therefore, as indicator, the analysis of chemical elements on ostracod shells is very important not only for palaeontologists but also for sedimentologists to reconstruct palaeoenvironment.
TS-1催化环己酮氨氧化反应本征动力学模型
,周继承
化工学报 , 2004,
Abstract: 由TS-1催化环己酮氨氧化反应机理出发,分析了反应过程的特点及反应规律,根据推测的机理,建立了反应本征动力学模型.结合搅拌釜中测得的动力学数据,对动力学模型进行了参数估值及模型筛选.结果表明,假设反应合乎羟胺机理、双氧水吸附、表面反应为控制步骤时所导出的模型能较好地拟合实验数据,并满足统计检验.根据该动力学模型,通过模拟计算对部分操作条件进行了分析和优化.
高速公路入口匝道多维可调模糊控制器设计
,
公路交通科技 , 2006,
Abstract: 鉴于入口匝道多维模糊控制器的控制规则库会随着人们控制方面经验的增加而变得愈加复杂,从而造成规则之间的冗余性、兼容性问题。因此,给出入口匝道多维模糊控制器的解析描述,不仅有效地解决了多维模糊控制器控制规则之间的冗余性、兼容性问题,而且通过在不同状态下引入不同加权因子实现了控制器的自调整,使所设计的模糊控制器更能适应实际的高速公路交通需求。最后通过MATLAB仿真得到的结果表明,控制效果令人满意。
时变条件下应急物流多目标LRP研究

公路交通科技 , 2012,
Abstract: 应急物流系统的多目标选址-路径问题主要旨在解决应急物流中心的选址问题、物流中心处理能力的设定问题和各类应急物资车辆运输路径的选择问题。基于既有研究成果,主要考虑时变条件下物资需求的多样性特点,兼顾应急物资类型的多样性特点和物流中心最小处理量要求,以运输路线能力和含有富余度系数的物流中心能力为约束条件,以时间和费用最小化为优化目标,建立了更为完善的多目标0-1混合整数线性规划模型。采用百分比无量纲化技术消除优化目标的量纲,并设计了基于目标规划的模型求解算法。通过算例试验,对比分析了0-1混合整数线性规划模型与既有模型的时间和费用。结果表明,相较于既有模型,该模型所得的选址-路径方案在费用和时间的消耗上都有所下降,更符合应急物流管理的实践工作。
无机钛硅原料合成TS-1对环己酮氨氧化的催化性能
,周继承
分子催化 , 2003,
Abstract: 考察了无机钛硅原料TS-1合成过程中晶种、促进剂、动静态及样品预处理对催化环已酮氨氧化反应性能的影响.结果表明:合成条件对TS-1样品晶粒尺寸影响较大;样品晶粒尺寸较大而引起的晶内扩散限制是无机钛硅原料TS-1催化性能降低的最主要的原因;样品预处理可以较大幅度地提高环己酮的转化率及肟的收率.在动态加晶种条件下合成的TS-1晶粒较小,经预处理后环己酮的转化率可达97%以上,肟的收率94%以上.
磷酸对无机钛硅原料体系合成TS-1晶化速率的促进作用
,周继承
分子催化 , 2005,
Abstract: 考察了磷酸对无机钛硅原料体系合成TS-1晶化速率的影响.结果表明,磷酸的单独引入,可以将晶化时间由原来的120h左右缩短到90h左右.当晶种与磷酸共同作用时,晶化时间可以缩短到60h.同时磷酸的加入对TS-1的晶粒尺寸及晶型也有影响.在既不加入晶种也不加入无机酸时,TS-1晶体在9μm左右;加入晶种后约为6μm;加入无机酸后约18μm左右,且晶体两端呈尖形;当无机酸与晶种同时作用时约为13μm,晶型与单独加入磷酸的样品相同.另一方面,加入磷酸TS-1原粉的收率可以提高到85%左右.这表明磷酸的加入促进了TS-1晶体的生长,提高了晶化速率,缩短了晶化时间.
VA菌根促进小麦生长的生理基础研究
丽莉,
麦类作物学报 , 1998, DOI: 10.7606/j.issn.1009-1041.1998.01.002
Abstract: 本文用盆栽法研究了非灭菌条件下接种VA菌根真菌Glomusmoseae对小麦营养生长的影响。结果表明,接种Glomusmoseae能显著提高对小麦的侵染率,接种株的营养生长、磷吸收、叶绿素含量及光合作用参数都明显优于对照株。不同施磷水平对VA菌根效应都有不同程度的影响,说明接种VA菌根真菌能促进小麦生长,提高磷肥的利用率。
介形类壳体无机成份的定量分析及其指相意义

海洋科学 , 1987,
Abstract: 本文报道了笔者对四十六枚现生和化石四组介形类标本(现生海洋、现生淡水湖泊、化石海相、化石陆相介形类)壳体的内表皮层(即钙质层)进行能谱无机成份定量分析的结果。初步研究表明:介形类钙质壳体中各微量元素的出现频度、平均含量、钙镁比值等有关指数与它们的生活环境有密切关系。
卧式炉的富氧燃烧试验及数值模拟
郭风,
热力发电 , 2009,
Abstract: 利用卧式炉对煤粉气流在富氧气氛下的燃烧进行了试验和燃烧数值模拟,结果表明,在富氧气氛下,提高了煤粉的燃烧速率,炉内温度场水平升高,燃料燃烧更加完全;火炬前端的温度水平显著提高,煤粉气流的着火距离缩短,燃烧速率加快,有利于实现煤粉富氧直接点火;烟气中co的含量减小,no??x?含量先增大后减小,so?2含量呈增大趋势。
Research of fault tolerant architecture and policies in component mode
构件模型的容错体系结构和策略研究

ZHAO Hong,

计算机应用研究 , 2007,
Abstract: 为了提高分布应用的健壮性,通常需要开发人员编写相应的容错代码。现有的CORBA构件模型通过定义构件的端口特征,以组装的方式实现代码的二进制级复用,它使用户能够快速开发和部署分布应用。在此基础上,如何在构件模型下快速灵活地建立容错应用成为一个令人关注的话题。通过设计构件模型下的容错体系结构,提供了快速灵活开发容错应用的机制,并提出了解决两种失效类型的容错策略和算法。
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