水平多层spiral型地埋管数值模拟研究及换热特性分析

本文基于COMSOL软件建立了水平spiral型多层地埋管群传热三维数值模拟模型,并对其换热性能和温度场进行分析研究。结果表明:对比水平spiral多层并联管群来说,远离注入端的地埋管管内温度相对较低。地埋管群周围地层温度有所升高,远离注入端的地层温度变化相对较小。地埋管群的换热量随循环流体的流速增加而增加,但增幅降低。在进行换热器设计时,应合理控制循环水的流速。3层螺旋地埋管群的换热量略高,但层间干扰明显,建议选用2层并联螺旋管群。

Identification of Co-Segregating RAPD Marker Linked to Powdery Mildew Resistance Gene Pm18 in Wheat

The Pm18 gene of wheat confers resistance to the powdery mildew which is one of the mostserious diseases in many regions of the world. In this study, bulked segregant analysis(BSA) was used to develop randomly amplified polymorphic DNA (RAPD) markers linked toPm18 gene. Three hundred and twenty decamer primers were screened and one of them wasidentified as RAPD marker (S411600) linked to Pm18. Using the F2 mapping population fromthe cross Pm18Chancellor, the marker S411600 was shown to co-segregate with the genePm18. This marker can be conveniently used for marker-assisted selection in wheatbreeding programs for the identification or pyramiding of Pm18 with other resistancegenes.

IDENTIFICATION OF RAPD MARKER LINKED TO POWDERY MILDEW RESISTANCE GENE Pm12 IN WHEAT

Powdery mildew is one of the most serious diseases of wheat in China. In this paper,bulked segregant analysis (BSA) was used to search for randomly amplified polymorphic DNA (RAPD) markers linked to the Pm12 gene,which confers resistance to the powdery mildew in wheat. 200 decamer primers were screened and one RAPD marker (S107 1900 ) was identified to be linked to Pm12 in coupling phase,and their genetic distance is 11.98± 4.00cM. This marker can be used for marker-assisted selection in wheat breeding for the identification or pyramiding of Pm12 with other resistance genes.

39021采面高位钻孔抽采规律及布置层位研究

为了提高39021工作面采空区瓦斯抽采效果,针对高位钻孔技术开展相关研究和考察。依据采动裂隙演化规律和理论确定冒落带、裂隙带范围,类比39011工作面高位钻孔设计,确定39021高位钻孔布置参数,并通过考察工作面回采期间抽采纯流量,验证设计的可行性,考察出高位钻孔布置适宜的垂距、平距和与切眼的距离。