常压射流等离子体处理PET膜诱导自由基研究

为了考察常压射流等离子体(APPJ)处理对PET膜表面诱导自由基及其引发接枝共聚反应的效能,采用电子自旋共振技术(ESR)对APPJ处理前后PET膜表面生成的自由基及其衰变行为进行测试分析,并与接枝率测试结果进行对比。结果表明:纯He气体的APPJ处理更易引发PET膜表面生成自由基,处理时间越长,膜表面自由基浓度越高,自由基产物的稳定性受存储条件影响显著,自由基浓度越高的样品对应的接枝率也越高。     

新型网壳节点的弹塑性分析及试验研究

简要介绍了一种广泛应用于各类意志支,双层网壳结构的新型承插式节点,在弹塑性理论分析的基础上,进行了一组单向拉,压试验研究,为今后在实际工程中推广这种新型节点提供了可靠依据。     

Leakage of mantle helium from the Liaodong Peninsula, China

The isotopic cumpositions of helium have been investigated in hot spring gases sampled from the Liaodong Peninsula. China. The³He/⁴He ratios range from 0.14 Ra (0.14 times the atmospheric³He/⁴He ratio of 1.40 × 10^-6 to 0.72 Ra.³He/⁴He versus⁴He/²⁰Ne ratios and He contents suggest that a small amount of mantle-derived helium reaches the earth’s surface. Helium iwtope ratios of the hot spring gases show a distribution pattern similar to the regional heat flow values, indicating that the positive thermal anomaly occurring in the rtrea is closely associated with the presence of mantle-derived helium. The observations described above provide some significant evidence that the molten magma originating from partial melting of the upper mantle may have intruded into the continental crust along the activity fault. The coupling of the presence of mantle He and heat flow anomalies to seismic activity in studied region seem to imply that there is an internal relationship between mantle degassing and seismic activity.     

应变速率对8090Al-Li合金拉伸性能的影响

用动态拉伸的方法研究了应变速率对 80 90 Al— L i合金拉伸性能的影响 ,应变速率的范围为 10 - 3～ 10 3s- 1。结果表明 ,合金的强度和塑性随应变率的增加而增加。试样的 SEM和 TEM分析发现 :准静态下的断裂为沿晶断裂 ;随着应变率的增加 ,断裂从穿晶准解理断裂过渡到由显微空穴聚集而成的韧窝断裂。高应变率下80 90 Al- L i合金强度和塑性的提高与其变形机制和晶界无沉淀区 (PFZ)的变化有关     

双剪强度理论在水工压力隧洞弹塑性应力分析中的应用

水工压力隧洞的弹塑性分析,工程上一直采用Ｍｏｈｒ－Ｃｏｕｌｏｍｂ强度准则进行求解。但由于该理论和试验结果常常不符,故产生误差。本文应用俞茂宏教授提出的双剪强度理论对水工压力隧洞进行弹塑性分析,解决了上述问题。     

16MnR钢中疲劳裂纹扩展的细观研究

采用显微疲劳试验方法和显微疲劳试验装置对低合金钢１６ＭｎＲ单边缺口试样进行了疲劳试验,研究了短裂纹萌生和扩展的特征。结果表明,短裂纹萌生及扩展分三个阶段,每一阶段的形貌都有其特点,在裂纹扩展后期,短裂纹的发展以裂纹密度不断增加并形成损伤区为主要特征,然后在损伤区选择一条主裂纹扩展。     

吸收比-系数倍率法及其应用——水杨酸钠、安替比林和咖啡因的同时测定

用吸收比－系数倍率法同时测定撒痛风注射液中水杨酸钠、安替比林和咖啡因三组分的含量。它们的回收率分别为１００．７％～１０２．１％、９５．９３％～１０４．５％和９７．５７％～１０１．７％。     

Molecular cloning and nucleotide sequence of classical swine fever virus strain Shimen

According to the previously published CSFV sequences, 18 paris of partially overlapping primers which span the entire genome of CSFV strain Shimen were designed and synthesized. Each cDNA fragment of strain Shimen was amplified by RT-PCR method from the anticoagulant blood of strain Shimen infected pig. The PCR fragments were cloned into pGEM-T vector respectively and sequenced. The results show that we have obtained the nucleotide sequence of strain Shimen. The viral RNA consists of 12 297 nucleotides including noncoding regions of 373 and 227 bases at the 5′ and 3′ end, respectively, and a single large open reading frame spanning 11 697 nucleotides in the middle, which encodes an amino acid sequence of 3 989 residues with a calculated molecular weight of 437.6×10³. The precisely sequencing of 5′ and 3′ termini is undertaking. Supported by the National Pandeng Project Huang Qianhua: born in 1968. Graduate student     

提高注射法导入外源基因棉铃成铃率的技术研究

对采用注射法导入外源基因的棉铃,在激素种类、不同生态条件、结铃部位、结铃性、整枝方式等方面进行分析,探讨了导入棉铃落铃机理和提高导入棉铃成铃率的技术途径。     

Thermal Deformation Measurement and Stress Analysis of PQFP Assembly during Power Cycling

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