DBQ3000型塔机主臂杆纵向闭合裂纹强度的研究

用SQCE理论,对DBQ3000型塔机主臂杆母材非接头和接头部位存在的纵向闭合裂纹进行了分析计算,圆满地解决了先天性表面纵向闭合裂纹对塔机主臂杆强度和寿命的影响问题。对含裂纹构件的安全评定做了新的尝试。     

用有限元方法对贮气罐进行优化设计

本文介绍用有限元方法对盘绕蛇形高压贮气罐(以下简称贮气罐)进行优化设计.计算与测试结果表明,其外径与内径之比K值的设计小于国外同类产品的k值.     

省市级科委科研项目管理计算机系统

介绍了一个实用的计算机辅助管理系统——省市级科委科研项目管理系统,系统是以dBASE Ⅲ为主,并辅之以C的混合语言实现的。除了一般管理系统所具有的咨询,统计等功能外,还具有图形分析功能,文章对图形分析模块功能和实现方法,以及两种语言相互通信的方法和技巧作了重点介绍。     

VMS系统服务向量空间的内部特征

详细分析了系统服务向量空间的内部特征,并给出系统服务与全局入口点虚地址之间的对应关系。     

送风系统振动问题的研究

北京热电总厂所属第一热电厂9~#炉送风机和风道系统长期以来存在着严重的振动问题。本文在大量测试和分析的基础上,确定了振动原因,是由于风机出现了脱流,且脱流导致空气动力场的脉动频率和风机风道的局部固有频率一致产生了共振.根据这一结论所提的减振措施在现场验证性试验中取得了预期的效果.     

火炸药中的几个化学概念

本文针对火炸药组份的分子结构特点,燃烧、爆炸过程中元素氧化态的变化情况,提出了氧化态变化数、绝对氧化态变化数、实际绝对氧化态变化数等新的化学概念。用这些化学概念不仅可以说明火炸药的氧化性和可燃性,而且能表征其潜在的和实际的反应特征。这对火炸药分子特性的了解有重要的指导性的意义。     

应用传输线网模拟技术对非线性电路故障诊断的研究

本文利用传输线网模拟技术(T.L.M.)将电路的线性和非线性部分有效地分隔开,从而使非线性电路的故障诊断简化为线性电路的拟故障集定位,然后经过简单的测后计算即可确定真正的非线性故障元件。     

电厂筛碎贮仓楼振动与抗震性能的研究规划——电厂筛碎贮仓楼振动与抗震性能研究之一

本文概括地介绍东北电力设计院与哈尔滨建筑工程学院钢筋混凝土结构研究室的科研合作项目“电厂筛碎贮仓楼振动与抗震性能”的研究规划,包括课题的工程背景及意义、研究内容与方法等。     

三维机织间隔复合材料结构对其力学性能的影响

以玻璃纤维为原料,设计3种不同结构的三维机织间隔织物,采用手糊成型工艺制备三维机织间隔复合材料,研究了其在压缩、剪切、弯曲等载荷作用下的力学特性,并分析了材料结构对其力学性能的影响。结果表明,相同高度(20 mm)、相同间隔(30 mm)的3种三维机织间隔复合材料的压缩强度和剪切强度均表现为:三维纤维间隔复合材料<"X"型间隔复合材料<三维织物间隔复合材料,其压缩强度分别为0.52,0.72,1.66 MPa,剪切强度分别为0.22,0.28,0.36 MPa;3种三维机织间隔复合材料的弯曲强度基本相同,均为4.30 MPa左右。     

Genome-Wide Identification and Characterization of Soybean GmLOR Gene Family and Expression Analysis in Response to Abiotic Stresses

The LOR (LURP-one related) family genes encode proteins containing a conserved LOR domain. Several members of the LOR family genes are required for defense against Hyaloperonospora parasitica (Hpa) in Arabidopsis. However, there are few reports of LOR genes in response to abiotic stresses in plants. In this study, a genome-wide survey and expression levels in response to abiotic stresses of 36 LOR genes from Glycine max were conducted. The results indicated that the GmLOR gene family was divided into eight subgroups, distributed on 14 chromosomes. A majority of members contained three extremely conservative motifs. There were four pairs of tandem duplicated GmLORs and nineteen pairs of segmental duplicated genes identified, which led to the expansion of the number of GmLOR genes. The expansion patterns of the GmLOR family were mainly segmental duplication. A heatmap of soybean LOR family genes showed that 36 GmLOR genes exhibited various expression patterns in different tissues. The cis-acting elements in promoter regions of GmLORs include abiotic stress-responsive elements, such as dehydration-responsive elements and drought-inducible elements. Real-time quantitative PCR was used to detect the expression level of GmLOR genes, and most of them were expressed in the leaf or root except that GmLOR6 was induced by osmotic and salt stresses. Moreover, GmLOR4/10/14/19 were significantly upregulated after PEG and salt treatments, indicating important roles in the improvement of plant tolerance to abiotic stress. Overall, our study provides a foundation for future investigations of GmLOR gene functions in soybean.