输出缓冲优先级管理的ATM交换节点性能分析

本文分析了一种比较接近于宽带综合业务数字网(B-ISDN)实际情况的排队模型．结合ATM交换节点，分析了在优先级管理下各业务信元的丢失概率和平均延时。     

六杆机构瞬心的求解顺序

本文对六杆机构瞬心的求解进行了分析,给出了这类机构瞬心的求解顺序     

防城港二期围海工程后的潮流变化及溢流悬沙输移

用浅滩潮流模型预测防城港二期围海工程对港湾潮流的影响，用泥沙模型模拟溢流悬浮沙的输移范围，结果表明，二期工程后防城港潮流变化不大，溢流悬沙浓度大于１０ｍｇ／Ｌ的最大范围为２０００ｍ。     

红景天甙的提取工艺研究

本文总结了用乙醇提取，用水和醇处理，再经Ａｌ２Ｏ３柱层析，从国产红景天根中提取红景天甙的方法。本法具有流程短、简便、易行的特点。     

不同小麦品种叶片衰老过程中谷氨酰胺合成酶和蛋白水解酶的活性变化

五个不同的半矮秆小麦品种在叶片自然衰老过程中,蛋白水解酶活性、可溶性蛋白含量、全N含量等方面没有显著差异,而只有谷氨酰胺合成酶(GS)活性过早的提高与秸杆N的残留量和产量有明显的负相关性.     

Biomarkers in fluid inclusions of polymetallic deposit of Qixiashan, Nanjing

Conclusions Organic fluid involved in Pb-Zn mineralization in the polymetallic deposit of Qixiashan probably derives from bacteria and algae, and is similar to that of the mature crude oil system. Part of lead and zinc in fluids can be transported by organic complexes, while their precipitation is caused by organic reduction. Biomarkers in ores can indicate the source of organic matter in fluids, but organic matter in inclusions must be studied to ascertain organic metallogenesis because of the EOM difference between ores and inclusions. The host strata of Upper Carboniferous (C2) and Lower Permian (PI) in Qixiashan deposit are both oil-bearing in the region. Identification of organic fluid and its biomarkers in the deposit provides significant information for further studies on the relationship between ore deposits and oil pools in the region.     

Experimental study of gold distribution in the algae-organic matter-fluid system

Conclusion Gold distribution and transformation in algae-organic matter-fluid system is very complicated. Gold is first concentrated in kerogen after algae died. With the increase of dissolved organic matter owing to the increase of temperature and pressure, part of gold simultaneously emigrates from kerogen to DOM. When DOM forms organic fluid and emigrates from the strata, gold is simultaneously carried away by organic fluid in acidic condition, but by water in alkali condition. When the auriferous fluid flows through carbonaceous strata, gold in fluid is unloaded by kerogen. Gold migration in the system, accompanied by the evolution of algae-organic matter-fluid, provides the basic information of biometallogenetic evolution of gold.     

一种新型刀具耐磨涂料的研究

本文针对高速钢刀具和普通硬质合金刀具的主要磨损形式,设计了一种新型的刀具耐磨涂料.该涂料主要是从改善刀具的润滑状况,降低切削温度的角度,来延长刀具的使用寿命的.本文从摩擦磨损的角度对该涂料的耐磨机理进行了探讨.     

黑曲霉葡萄糖淀粉酶cDNA的克隆和序列分析及其在大肠杆菌中的表达(英文)

以poly(A)~ mRNA为模板,噬菌体λgt 10 DNA为载体构建了黑曲霉3758的cDNA的文库。用编码黑曲霉葡萄糖淀粉酶329—418位氨基酸的DNA顺序(456bp)作探针从该文库中筛选葡萄糖淀粉酶cDNA。采用原位噬菌斑杂交法获得11个阳性噬菌斑,从其中6个噬菌体中提取DNA进行限制酶切分析和印迹法转移杂交试验,发现这些阳性噬菌体DNA含有不同大小的插入片段,它们都能与DNA探针杂交,表明已克隆了葡萄糖淀粉酶的cDNA。采用单酶切及交叉双酶切法制定了2.1kbcDNA的物理图并对2.1kb片段作了全序列分析。序列分析结果显示,克隆的2.1kb片段含5＇端非编码区,编码葡萄糖淀粉酶的结构基因及3＇端非编码区。克隆的cDNA片段转移至表达载体λgt11,感染大肠杆菌后,产生的噬菌斑转移硝酸纤维素滤膜后与~(125)I标记的抗葡萄糖淀粉酶抗体进行免疫反应,结果证明含2.1kbcDNA的λgt11表现葡萄糖淀粉酶阳性.2.1kb片段也曾转至质粒pPL2,转化大肠杆菌JF1125。细胞裂解物在SDS-PAGE电泳中可看到新的蛋白带。这些结果表明,克隆的黑曲霉葡萄糖淀粉酶cDNA可以在大肠杆菌中表达。     

Wolstenholme不等式的高维推广及应用

本文给出Wolstenholme不等式的高维推广,作为其应用之一,直接获得了关于单形诸内二面角余弦和的上界估计值,并由此将一个著名几何不等式推广到高维空间.