钢桁梁反向拖拉架设施工技术

宣杭铁路复线崇贤特大桥采用1～64m栓焊下承式钢桁架梁，跨越杭州市北绕城高速公路崇贤高架桥。钢桁架梁架设施工中采用在高架桥两侧用军用墩搭设两个临时支墩，同时利用高架桥桥梁中央分隔带70cm的空隙，用8根[30槽钢搭设临时支墩，在不加前端导梁的情况下，进行反向拖拉，顺利完成了钢桁梁的架设施工。     

钢筋混凝土构件损伤演化的分形行为

根据试验资料,分析了钢筋混凝土构件在分级荷载作用下开裂及裂纹的演化、分布特性,证明了钢筋混凝土构件表面裂缝分布具有分形性质,并且不同损伤状态下构件表面裂缝的分维数与其动力特性参数之间具有良好的负线性相关关系。研究表明该分维数可作为钢筋混凝土构件损伤程度的衡量指标,从而为钢筋混凝土结构无损检测和剩余寿命评价提供了新的思路和方法。     

中国智能运输系统(ITS)的发展

论文概括论述了国内外智能文通系统工程的发展,特别是我国当前交通运输系统深化 的问题,论述了我国“十五”智能交通发展的指导方针政策以及开发的重点,论文对我国的发展智能交通的系统的重点问题都进行阐述.     

不同硒化合物对淋巴细胞代谢的影响

本文观察了不同浓度(10~(-8)～10~(-4)mol/L)的亚硒酸钠、硒酸钠和硒蛋氨酸对体外培养淋巴细胞DNA、RNA和蛋白质合成,ATP含量及GSH—px活性的影响,以比较3种硒化合物的毒性。结果表明3种硒化合物对DNA、RNA和蛋白质合成均有双相效应,在10~(-4)mol/L时亚硒酸钠抑制率高于硒酸钠和硒蛋氨酸(P<0.0001),ATP含量随硒浓度增加明显低于对照组。3种化合物的毒性顺序为:亚硒酸钠>硒酸钠>硒蛋氨酸。在实验浓度范围内GSH—px活性均高于对照组。     

交流传动内燃机车中间直流电压的控制

分析了交流传动内燃机车控制系统的结构特点及中间直流电压控制方式对逆变器的影响；提出了柴油机部分负荷下中间直流电压的控制规律；给出了由分析和实验获得的励磁机，主发电机控制模型。     

Network Decomposition and Maximum Independent Set Part Ⅱ：Application Research

According to the researches on theoretic basis in part I of the paper，the spanning tree algorithms solving the maximum independent set both in even network and in odd network have been developed in this part，part Ⅱ of the paper．The algorithms trans form first the general network into the pair sets network，and then decompose the pair sets network into a series of pair subsets by use of the characteristic of maximum flow passing through the pair sets network．As for the even network，the algorithm requires only one time of trans formation and decomposition，the maximum independent set can be gained without any iteration processes，and the time complexity of the algorithm is within the bound of O(｜V｜^3)．However，as for the odd network，the algorithm consists of two stages．In the first stage，the general odd network is transformed and decomposed into the pseudo-negative envelope graphs and generalized reverse pseudo-negative envelope graphs alternately distributed at first；then the algorithm turns to the second stage，searching for the negative envelope graphs within the pseudo-negative envelope graphs only．Each time as a negative envelope graphhas been found．renew the pair sets network by iteration at once．and then tum back to the first stage．So both stages form a circulation process up to the optimum．Two available methods，the adjusting search and the picking-off search are specially developed to deal with the problems resulted from the odd network．Both of them link up with each other harmoniously and are embedded together in the algorithm．Analysis and study indicate that the time complexity of this algorithm is within the bound of O(｜V｜^5)．     

OBSERVATION OF THE EFFECT OF S－（－）USNIC ACID SODIUM ON TRICHOMONAS VAGINALIS BY TRANSMISSION ELECTRON MICROSCOPE

ＯＢＳＥＲＶＡＴＩＯＮＯＦＴＨＥＥＦＦＥＣＴＯＦＳ－（－）ＵＳＮＩＣＡＣＩＤＳＯＤＩＵＭＯＮＴＲＩＣＨＯＭＯＮＡＳＶＡＧＩＮＡＬＩＳＢＹＴＲＡＮＳＭＩＳＳＩＯＮＥＬＥＣＴＲＯＮＭＩＣＲＯＳＣＯＰＥＷｕＪｉｅ；ＺｈａｎｇＭｉｎｒｕ；ＤｉｎｇＤｏｎｇｎｉ...     

登州港在唐代的历史贡献

登州港是历史悠久的古港之一,唐代,它更是北方重要港口.中华优秀的传统文化对朝鲜半岛和日本的传播,登州港功不可没.本文介绍了传播的内容和影响,从一个侧面反映了登州港的历史功绩.     

纤维素降解菌的分离鉴定及固态发酵条件

从腐烂稻草、土壤和牛粪等样品中分离到12株能在以CMC-Na(羧甲基纤维素钠)为唯一碳源的固体培养基上生长的菌株,并从中筛选出1株分解纤维素能力较强的真菌,初步鉴定为脉纹孢菌(Neurospora sp.).通过对其固态发酵条件进行单因素优化试验,初步确定了发酵培养基最佳碳、氮源种类及添加量:稻草粉与麸皮的质量比为9∶1,NH4NO30.5%;最适培养条件为:固液比1∶3,接种量1 mL,pH值自然,培养温度30℃,培养时间96 h.该菌株的羧甲基纤维素酶活和滤纸酶活分别达到3 551.1和386.7μmol/(g.h).     

机场道面温度应力的试验研究

通过对某机场水泥砼道面温度场和温度应变的现场实测 ,在此基础上提出了水泥砼机场道面温度场和温度应变场的变化规律 ,最后采用理论分析计算与实测温度应力 (应变 )进行比较 ,以验证理论计算的正确性