新型感应透热炉逆变电路的理论分析

研制了一种新型逆变电路,与国内常用感应炉逆变桥比较,其特点为工作频率高、输出电压低、电热效率高、结构简单,经工业生产试用,感应炉运行可靠,功率损耗低,加热中小类锻件,具有明显的优点。本文对该新型逆变电路的稳态过程,建立微分方程,推导出输出功率、电流、电压、频率、功率因数的计算公式,为电炉设计及元件参数选择提供了依据。同时将该电路与常用并联逆变电路性能比较,论证了其优越性。     

农业综合开发专用图的精度及其应用的研究

农业综合开发的重点是改造中低产田,对于低洼易涝地区是除涝治碱,健全排灌系统。本文分析了农业综合开发工程建设的任务及其精度要求,并对专用图的测绘精度和应用进行了探讨,将二者结合起来进行研究,因而对如何搞好专用图的测绘和如何应用好专用图均具重要参考价值。     

厚板材性参数分析研究

本文通过对近期国产厚板试验资料的整理和分析,求得了它们的材性统计参数。可作为有关标准(如钢结构设计规范)的补充和有关分析(如高层钢结构设计计算)的基础。     

文克勒地基上圆形薄板受轴对称载荷作用的贝塞尔函数解

利用贝塞尔函数给出了文克勒地基上圆形薄板受轴对称载荷作用解的解析表达式,并计算了文克勒地基上受均布载荷作用的圆形薄板的挠度,给出了挠度曲线.     

Genome-Wide Identification and Analyses of Drought/Salt-Responsive Cytochrome P450 Genes in Medicago truncatula

Cytochrome P450 monooxygenases (P450s) catalyze a great number of biochemical reactions and play vital roles in plant growth, development and secondary metabolism. As yet, the genome-scale investigation on P450s is still lacking in the model legume Medicago truncatula. In particular, whether and how many MtP450s are involved in drought and salt stresses for Medicago growth, development and yield remain unclear. In this study, a total of 346 MtP450 genes were identified and classified into 10 clans containing 48 families. Among them, sixty-one MtP450 genes pairs are tandem duplication events and 10 MtP450 genes are segmental duplication events. MtP450 genes within one family exhibit high conservation and specificity in intron–exon structure. Meanwhile, many Mt450 genes displayed tissue-specific expression pattern in various tissues. Specifically, the expression pattern of 204 Mt450 genes under drought/NaCl treatments were analyzed by using the weighted correlation network analysis (WGCNA). Among them, eight genes (CYP72A59v1, CYP74B4, CYP71AU56, CYP81E9, CYP71A31, CYP704G6, CYP76Y14, and CYP78A126), and six genes (CYP83D3, CYP76F70, CYP72A66, CYP76E1, CYP74C12, and CYP94A52) were found to be hub genes under drought/NaCl treatments, respectively. The expression levels of these selected hub genes could be induced, respectively, by drought/NaCl treatments, as validated by qPCR analyses, and most of these genes are involved in the secondary metabolism and fatty acid pathways. The genome-wide identification and co-expression analyses of M. truncatula P450 superfamily genes established a gene atlas for a deep and systematic investigation of P450 genes in M. truncatula, and the selected drought-/salt-responsive genes could be utilized for further functional characterization and molecular breeding for resistance in legume crops.     

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.     

Matlab图形用户界面辅助《化学信息学》教学

化学信息学是一门利用信息学、计算机科学和技术来解决化学问题的学科。本文利用Matlab科学计算软件的图形用户界面(GUI)功能,通过分子模拟课堂教学的具体实例来展示图形用户界面在化学信息学课程辅助教学中的优点。交互式图形用户界面使得分子模拟过程直观可视化,通过理论与实践教学的结合有助于提高教学质量,激发学习兴趣。     

浅谈Excel在水泥质量管理中的应用

压力机、全自动水泥氯离子测定仪等仪器导出的文本数据,引入Excel文档中进行检验数据的提取记录与统计分析;物检及分析人员通过共享设置功能实行多人同时编辑台账,实现数据的实时更新;依据不断更新的台账,运用"LOOKUP"函数开具检验报告,效率及准确性大幅度提高。