郑州市某温室工程钢结构制作工艺

通过精心设计、组织,成功解决了某大型温室钢结构的制作技术问题。异形锕结构的矫正是本工程钢结构制作的难点,该工程采用新型热煨工艺成功解决了这一技术难题,达到了异形铜结构的制作技术要求,可供同类工程借鉴。     

The Combination of Conventional QTL Analysis,Bulked-Segregant Analysis,and RNA-Sequencing Provide New Genetic Insights into Maize Mesocotyl Elongation under Multiple Deep-Seeding Environments

Mesocotyl length (MES) is an important trait that affects the emergence of maize seedlings after deep-seeding and is closely associated with abiotic stress. The elucidation of constitutive-QTLs (cQTLs) and candidate genes for MES and tightly molecular markers are thus of great importance in marker-assisted selection (MAS) breeding. Therefore, the objective of this study was to perform detailed genetic analysis of maize MES across 346 F_2:3 families, 30/30 extreme bulks of an F₂ population, and two parents by conventional QTL analysis, bulked-segregation analysis (BSA), and RNA-sequencing when maize was sown at the depths of 3, 15, and 20 cm, respectively. QTL analysis identified four major QTLs in Bin 1.09, Bin 3.04, Bin 4.06–4.07, and Bin 6.01 under two or more environments, which explained 2.89–13.97% of the phenotypic variance within a single environment. BSA results revealed the presence of seven significantly linked SNP/InDel regions on chromosomes 1 and 4, and six SNP/InDel regions and the major QTL of qMES4-1 overlapped and formed a cQTL, cQMES4, within the 160.98–176.22 Mb region. In total, 18,001 differentially expressed genes (DEGs) were identified across two parents by RNA-sequencing, and 24 of these genes were conserved core DEGs. Finally, we validated 15 candidate genes in cQMES4 to involve in cell wall structure, lignin biosyntheis, phytohormones (auxin, abscisic acid, brassinosteroid) signal transduction, circadian clock, and plant organ formation and development. Our findings provide a basis for MAS breeding and enhance our understanding of the deep-seeding tolerance of maize.     

新水土保持法主要制度解读

2011年3月1日起施行的《中华人民共和国水土保持法》确立和强化了水土保持目标责任制和考核奖惩制度等20多项制度。这些制度的建立和完善,保证了新时期水土保持事业的健康、有序、持续发展,并成为今后水土保持改革和发展的强劲动力。本刊专题约请水利部水土保持司副司长牛崇桓对主要制度进行深入解读。     

昆明市某商业综合体地下空间疏散对策研究

大型商业综合体具有面积大、跨度大的特点,给防火工作带来了诸多困难,其火灾特点也具有复杂性与特殊性,主要表现在建筑空间大、内部纵横交错、火灾荷载大;同时人员密集、疏散难度大,极易造成群死群伤事故。因此,大型商业综合体的地下空间防火意义重大。文章以昆明市某商业中心为例,通过对地下空间的分析研究,针对其火灾危险性提出相应的措施,为大型商业综合体地下空间的防火措施及疏散对策提供参考。     

快速高准确度的闪烁探测技术

闪烁探测器具有探测效率高和适于多种条件下应用等优点。但在高计数率测量时,光电倍增管出现的疲劳现象难以克服,其长期稳定性也较差。 本文提出一种措施,使闪烁探测器在每秒10~5个计数脉冲下获得了高的精度和好的稳定性。这项技术已经应用于FT-1型核子低含沙量计中。经测试表明,当每次测量历时为100秒时该仪器的计数精度和8小时长期     

变频调速器在供热锅炉中的应用

本文阐述了变频调速器的节能原理.以哈密基地1锅炉房工程为例,介绍了其在锅炉自动控制系统中的应用,并对其经济效益和社会效益进行了分析.     

放射性同位素X荧光测井技术的研究

对放射性同位素源Ｘ荧光测井技术的井液效应，井壁不平度效应和基体效应分别提出了实用的校正技术。野外锶矿Ｘ荧光测井试验表明：Ｘ荧光测井确定的锶矿层厚度和平均品位与传统的岩芯化学分析结果相比较，其相对误差〈１０％，符合锶矿储量计算要求；Ｘ荧光测井可在井场实时提供测井结果，而耗时却短得多。     

Insoluble porous conjugated polymer films via phase separation and photo‐crosslinking for the trace detection of 2,4‐dinitrotoluene

A novel conjugated polymer film with microscale/submicroscale porous morphology fabricated from crosslinked poly(fluorene‐co‐carbazole) (PFC1) was developed for the detection of 2,4‐dinitrotoluene (DNT). The fluorescent conjugated polymer PFC1 with pendant photo‐crosslinkable coumarin groups was synthesized by Suzuki coupling polymerization. Taking advantage of the phase separation of PFC1/polystyrene (PS) blends in the film and the solvent‐resistant network, porous structured films were prepared by removal of PS. Films with porous morphologies exhibited marked responsive sensitivity to trace DNT vapor due to the unique porous structure favoring the diffusion of and association with DNT molecules. The formation of a crosslinked network by dimerization of the coumarin moieties may be beneficial for isolating the polymeric backbones, thus to some extent preventing chain aggregation. This facile fabrication method enabled the crosslinked porous films to be efficient fluorescence chemosensors towards the detection of trace amounts of DNT vapor.© 2012 Society of Chemical Industry