新老混凝土的粘结机理和测试方法研究综述

就影响新老砼粘结性能的主要因素,新老砼结合面处理方法,修补材料的选择和应用,粘结剂的种类,新老砼粘结性能试验方法,新老砼粘结机理五个方面的问题进行了论述。依实际工程砼结构修补加固统计结果,指出实际砼修补量最大的是道路和桥梁,提出了关于道路、桥梁、汽车库、飞机场等交通设施,砼修补需进一步研究的问题。     

Preparation of enantiomerically pure 1,1′-bi-2-naphthols from 85% cinchonine and 1,1′-bi-2-naphtholboric anhydride

A possibility of preparation of enantiomerically pure 1,1′-bi-2-naphthols using an impure cinchonine has been examined. The solid and the mother liquor formed from the reaction of 1,1′-bi-2-naphtholboric anhydride and 85% cinchonine in toluene could give optically pure (S)-(−)- and (R)-(+)-1,1′-bi-2-naphthol after acidification and kinetic crystallization, the overall yields were 40% and 28%, respectively. Supported by the National Natural Science Foundation of China (2937206) and the Natural Science Foundation of Hubei Province (93J27) Xiong Ying, born in 1971, Graduate student     

高频气体放电等离子体处理对铁电体材料改性的影响

研究了高频气体放电等离子休对铁电体电滞特性的改性作用,并对其改性机现作了理论分析。研究表明：铁电体PZST经高频气体放电等离子体处理后,其电滞特性有明显改变,其中,矫顽电场强度Ee减小;自发极化强度Ps不变,其物理意义是铁电体电畴反转所需的能量降低;非线性增强。本文为铁电体电滞特性及其电光和光学非线性效应等的改变提供了一种新的物理实验方法。     

关于时滞Liénard型方程的周期解

本文研究具有时滞的Lienard型方程周期解的存在性,得到了一些新的结果。     

巴非蛤冷冻调理食品的加工工艺

本文介绍巴非蛤一种新颖的加工方法,工艺流程简单,只需冷冻、冷藏等设备就可生产,产品外观鲜美,味美可口,食用方便,该工艺对提高巴非蛤的食用价值和经济价值都具有一定的实际意义。     

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     

关于Hamilton图的一点注记

通过类似于对一可平面图求生成树个数的方法,得到一个关于Hamilton图的Hamilton圈的个数的等式。并讨论了一类特殊的平面图。     

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     

并联机器人及其机构学理论

介绍了并联式机器人,以及并联机器人机构学理论及其发展,特别介绍在称为２１世纪的新型机床;分析了并联机器人的结构,特点和广泛的应用前景。     

秋水仙碱与EMS处理坛紫菜离体细胞的初步观察

报道用不同浓度秋水仙碱与EMS（甲基磺酸乙酯）处理坛紫菜离体细胞,对处理后细胞的存活率、分裂和发育再生情况进行观察的结果。试验表明,秋水仙碱处理可显著抑制高体细胞分裂,促进再生藻体生长假根、增加有根苗比例,延缓再生藻体发育成熟与衰亡：浓度≥5×10-3时对离体细胞产生显著地致死和致再生藻体畸形作用。EMS处理也有一定的促进离体细胞再生苗生长假根作用,对细胞分裂抑制作用不明显,也未观察到明显的致畸变或致突变作用。较高浓度EMS处理（2×10-3处理2小时或4×10-3处理1小时）引起细胞急性中毒和严重死亡。