高瓦斯矿井防爆蓄电池电机车安全配套设施的研究及应用

文章首先介绍了矿井架线及防爆蓄电池电机车工作原理及优缺点,通过对屯兰煤矿架线电机车改造防爆蓄型电池电机车中安全配套设施的研究及应用,详细讲述了防爆型蓄电池电机车在高瓦斯矿井的技术参数制定、充电设备选择、供电系统设计、充电硐室布置、更换方案制定等内容,解决了矿井运输系统按规程要求更替,新机车完全替代架线机车性能指标的技术指标,并分析了该技术的经济社会效益及推广的可行性.     

浅析钢筋混凝土施工中产生裂缝的原因及对策

现代建筑物普遍采用钢筋混凝土的新型结构,钢筋混凝土结构建筑物不但整体强度较为优良,而且具备较强的抗震能力,还有效提高了建筑物的使用年限。虽然钢筋混凝土结构建筑物具备较多优点,但是其也存在一定的弊端和缺陷,局部位置可能出现裂缝现象就是急需得到解决的关键问题之一。本文就钢筋混凝土施工中容易产生裂缝的原因及对策作以简要的分析,借以提出改革和完善我国钢筋混凝土结构施工的可行方案和建议。     

轿车车身螺柱焊逆变电源

设计了轿车车身螺柱焊专用微机控制单端式逆变电源，该电源能够输出所需调幅电流波形，并给了焊机的典型电流电压输出波形图，同时介绍了该电源的抗干扰措施。     

非规范化处理在数据库设计中的应用

介绍了在数据库设计中的非规范化概念和方法，结合具体的省移动通信计费营业系统的数据库设计，描述了实际使用中应注意的关键问题及其解决方法     

CHY-Ⅲ仿真计算机系统体系结构

从大型战略武器系统的数字仿真、半实物仿真和闭环动态测试的需要出发，把先进的ＭＰＰ技术和先进的仿真技术相结合，提出了一种分布存储、基于消息传递的并行仿真计算机系统结构。它采用虫蚀寻径通讯技术和高速开关网络，构造了一个ＭＩＭＤ的大规模分布式并行仿真系统。实践证明，这种结构具有良好的可扩展性、灵活性和较高的并行效率     

MLL5 (KMT2E): structure,function, and clinical relevance

The mixed lineage leukemia (MLL) family of genes, also known as the lysine N-methyltransferase 2 (KMT2) family, are homologous to the evolutionarily conserved trithorax group that plays critical roles in the regulation of homeotic gene (HOX) expression and embryonic development. MLL5, assigned as KMT2E on the basis of its SET domain homology, was initially categorized under MLL (KMT2) family together with other six SET methyltransferase domain proteins (KMT2A–2D and 2F–2G). However, emerging evidence suggests that MLL5 is distinct from the other MLL (KMT2) family members, and the protein it encodes appears to lack intrinsic histone methyltransferase (HMT) activity towards histone substrates. MLL5 has been reported to play key roles in diverse biological processes, including cell cycle progression, genomic stability maintenance, adult hematopoiesis, and spermatogenesis. Recent studies of MLL5 variants and isoforms and putative MLL5 homologs in other species have enriched our understanding of the role of MLL5 in gene expression regulation, although the mechanism of action and physiological function of MLL5 remains poorly understood. In this review, we summarize recent research characterizing the structural features and biological roles of MLL5, and we highlight the potential implications of MLL5 dysfunction in human disease.     

陕西洛南龙牙北洞旧石器制作场地的发现及其意义

经过１９７７年和１９９５年的考察和发掘证实，陕西洛南龙牙洞是一个旧石器时代早期的遗址。１９９５年～１９９６年又对其北洞进行试掘，发现许多石制品及化石。近洞底部有未经变动的石制品富集层。从多方面研究认识到，龙牙北洞是一个原位遗址；是洛南直立人生产石器的场地；迫使当时古人类弃洞他迁的主要原因可能是洪水泛滥。     

Modeling of Solid-state Polycondensation of Poly (ethylene terephthalate)

A mathematical model has been developed to handle the reactions in Poly(ethylene terephthalate) (PET) undergoing polycondensation reactions in the solid state. The effect of temperature on chain mobility was considered to estimate the rate constants of chemical reactions. The polymer crystalline fraction is modeled as containing only repeat units, thus concentrating end groups and conden-sates in the amorphous fraction. This model is compared with PET reaction data with good results.     

加筋粉煤灰高支挡结构有限元分析

采用有限单元分析的数学方法，应用弹性非线性岩土模型，成功地对一加筋粉煤灰支挡结构力学性状进行了分析，计算过程模拟了逐层施工，数值计算结果与原位测试基本一致，并为加筋土技术应用于大型、重要工程提供了技术基础。     

形意拳中三体式的稳定性及其实用价值

从运动生物力学的角度和攻防实战方面对形意拳中三体式进行了全面的分析论证，说明三体式具有一定的稳定性和攻防实用价值