The discovery of early Permian reef belt in east Kunlun and its significance

The early permian reef belt is distributed in the southern side of eastern Kunlun, north area of Qinghai-Tibet Plateau. The core-reef facies of thc reel extends from Tuosuo Lake to Huashixia. Lots of reef breccia was found at the southern slope of the mre-reef belt, and to the north of the reef belt there is back-reef limestone. Cacisponges, hydrozoa, bryozoa,Tabulozoa, Tubiphytes and red algae are the main frame-building organisms.Archaeolithoporella, laminated blue-green algaes,Tabulozoa andTubiphytes played a role of binding or encrustating. There are many kinds of epibiont in the mf, including brachiopod, gasterid, foraminifera, echinoderm and simple coral. The type and the characteristics of the reef-building organisms in eastern Kunlun and Animaqing are basically thr same as those in the south of Chi     

Effect of lanthanum ions on tRNAphe structure: Imino proton NMR spectroscopy

The effect of lanthanum ions on the structural and conformational change of yeast tRNA Phe was studied by 1H NMR. The results suggest that the tertiary base pair (G-15)(C-48), which was located in the terminal in the augmented dihydrouridine helix (D-helix), was markedly affected by adding La 3+ and shifted 0.33 downfield. Based pair (U-8)(A-14), which is associated with a tertiary interaction, links the base of the acceptor stem to the D-stem and anchors the elbow of the L structure, shifted 0.20 upfield. Another imino proton that may be affected by La 3+ in tRNA Phe is the tertiary base pair (G-19)(C-56). The assignment of this resonance is tentative since it is located in the region of highly overlapping resonances between 12.6 and 12.2. This base pair helps to anchor the D-loop to the TΨC loop.     

Carbon isotope anomaly in marbles associated with eclogites from the Dabie Mountains

This is a report of carbon isotope anomaly in marbles associated with the UHP eclogites from the Dabie Mountains. The results place constraints on the degree of crust-mantle interaction during the UHP metamorphism.     

规避道德危害的信贷决策机制

研究了在不完全信息的信贷市场中,规避风险厌恶型企业道德危害的信贷决策机制,考察了在该机制中贷款利率、抵押品需求量和信贷配给对规避企业道德危害的作用．提出了这种机制作用下均衡的贷款合同应满足的一些性质．     

射流携带床气化炉内混合过程的数值模拟

采用ｋ－εＥ模型对射流携带床气化炉内α－萘酚与对氨基苯磺酸重氮盐的偶合竞争串联反应的分隔指数进行了数值模拟,研究了气化炉出口面积,长径比,两股射流动量比对分隔指数的影响。模拟结果表明,ｋ－ε－Ｅ模型由于同时考虑了宏观混合和微观混合的作用,其观测值和实验测试值吻合较好。     

Search for new antiphytovirucides

The lead compound of substituted 2-(4′-hydroxyphenyl)benzimidazoles were modified by phosphorylation sulfonation and carboxymethylation. The benzimidazoloamidophosphate (6) (7) have better activity against tobacco mosaic virus (TMV). The benzimidazolophenoxyacetic acid, phenoxysulfonic acid containing trifluoromethyl, and nitro group have 77%≈85% efficiency for wheat rust disease. Supported by the National Natural Science Foundation of China and National Laboratory of Elemento Organic Chemistry Nankai University Qu Fanqi: born in 1952, Associate professor     

相似设计方法在微小移动机器人性能分析中的应用

将微小移动机器人放大后,作模型试验,利用相似理论,进行模型的设计,并把模型的试验结果应用到原型上去。     

氩离子腔内倍频紫外连续激光器

本文从讨论培频效率入手,分析了影响倍频效率的原因,给出BBO晶体氩离子腔内培频紫外激光器的设计方案,制作了激光器,并得到了紫外激光输出。     

荧光法测定Ce^3＋与tRNA的结合常数

与其它稀土离子的自身荧光相比,稀土Ｃｅ３＋水合离子的荧光要强得多,并且在很宽的浓度范围内与其浓度成很好的正比关系,因此可以用来确定Ｃｅ３＋离子的浓度．ｔＲＮＡ非常强烈地猝灭Ｃｅ３＋水合离子的荧光．采用荧光滴定的方法研究了Ｃｅ３＋－ｔＲＮＡ体系,并用Ｓｃａｔｃｈａｒｄ方法测量了Ｃｅ３＋离子和ｔＲＮＡ的结合数和结合常数,结果发现：ｔＲＮＡ中有２组Ｃｅ３＋结合位置,其结合常数分别为约１０８ｍｏｌ／Ｌ和１０５ｍｏｌ／Ｌ．向体系中加入精胺可使结合数和结合常数稍微降低．     

小毛足鼠(Phodopus roborovskii)食性和食量的研究

小毛足鼠饲喂试验结果以及颊囊食物统计结果表明,该鼠在饲喂条件下食物资源利用谱相对较宽,但在野外条件下食物资源的利用主要以植物种子为主;并结合具体情况探讨了造成野外条件下该鼠食物资源利用范围趋于特化的原因．估算了小毛足鼠的采食效率为０．０７６％～０．１４％．在以上研究基础上,对小毛足鼠的危害与防治问题作了初步分析与说明