检索结果-南通市图书馆

Molecular Mapping of a Gene for Resistance to Stripe Rust in Wheat Variety PIW138

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2010年第9期9卷 1285-1291页

作者： YUE Yan-li yao zhan-jun REN Xin-xin WANG Li College of Agronomy Agricultural University of Hebei Baoding 071001 P.R.China

Stripe rust, caused by Puccinia striiformis f. sp. tritici （Pst）, is one of the most damaging diseases of common wheat （Triticum aestivum L.）. Wheat variety PIW138 introduced from Pakistan is resistant to the currently prevailing Pst race CYR32 in China. In this study, the bulked segregant analysis （BSA） method and simple sequence repeat （SSR） markers were used to map the stripe rust resistance gene in PIW138. The resistant and susceptible DNA bulks were prepared from the segregating F2 population of the cross between Thatcher, a susceptible variety as the female parent, and PIW138 as the male parent. The segregation of resistant and susceptible F2 plants inoculated with CYR32 indicated that single dominant gene determined the reactions of PIW138 line and temporarily designated as YrP138. Total 200 SSR primers were screened, and 4 SSR markers, Xwmc52, Xbarc61, Xgwm268, and Xgwm153, on chromosome 1B were found to be polymorphic between the resistant and the susceptible DNA bulks as well as their parents. Genetic linkage was tested on the segregating F2 population with 259 plants, including 196 resistant and 63 susceptible plants. All 4 SSR markers were linked to the stripe rust resistance gene in PIW138. The genetic distances of Xwmc52, Xbarc61, Xgwm268, and Xgwm153 to the resistance gene were 29.8, 6.2, 6.8, and 8.2 cM, respectively.

关键词： wheat Puccinia striiformis f. sp. tritici resistance gene microsatellite marker

The tetragonal-like distortion of Fe-Ga alloys interstitial doped with Cu

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第7期40卷 1851-1857页

作者： Xuan Zhao Xiao Tian zhan-Quan yao Li-Juan Zhao Rui Wang Jing Yan Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials School of Physics and Electronic InformationInner Mongolia Normal UniversityHohhot 010022China School of Water Conservancy and Civil Engineering Inner Mongolia Agricultural UniversityHohhot 010018China

The as-cast Cu-doped Fe_(83)Ga_(17)alloys were prepared by *** microstructures and magnetostrictions of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15)alloys were investigated by X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy and strain gauge magnetostriction *** sample magnetometer was employed to investigate the magnetic properties of(Fe_(83)Ga_(17))_(100-x)Cu_(x)(x=0,3,6,9,12,15).First-principal calculation was employed to make lattice structure and energy *** results indicate that Cu dopants dissolve into A2 lattice by interstitial doping,which induces tetragonal-like distortion of A2 *** the magnetostriction for Cu-doped Fe_(83)Ga_(17)alloys is lower than that of Fe_(83)Ga_(17)*** reduction of magnetostriction is attribute to the increase of Young’s modulus caused by Cu dopants dissolve into A2 lattice by interstitial doping and the decrease of magnetoelastic coupling coefficient for Cu-doped Fe_(83)Ga_(17)alloys caused by Cu dopants dissolve into A2 lattice.

关键词： Fe-Ga alloy Cu doping Magnetostriction Tetragonal-like distortion

Back Frame Optimization of a Large Radio Telescope Based on Force Cone Method

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2022年第5期27卷 424-438页

作者： WU Qinglong yao zhan WU Tanhui FANG Houfei HOU Yangqing Shanghai YueSheng Information Technology Co. Shanghai 201108China

A new research perspective is proposed to optimize the topology of truss structure by force cone method,which involves force cone drawing rules and growth *** the comparison with the mature variable density topology optimization method,the effectiveness of force cone method is *** kind of new method is simple and easy to understand(no need to master complex structural optimization design theory).Besides,it is time-saving in finite element calculations,and can obtain an optimized truss layout *** drawing the force cone,its application on a large radio telescope’s back frame structure shows that,compared with the existing one in terms of structural stiffness,Root Mean Square(RMS)precision,and beam stress distribution,the optimized back frame using the force cone method has higher stiffness,better RMS,more uniform stress,and lighter weight.

关键词： large radio telescope back frame force cone method topology optimization

The effects of coal blending on the formation and properties of particulate matter during combustion

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2010年第30期55卷 3448-3455页

作者： ZHOU Ke XU MingHou YU DunXi WEN Chang zhan ZhongHua yao Hong State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 Chin.a

The control of particulate matter (PM) emissions from coal combustion becomes an urgent work due to their adverse effects on human health. Coal blending is a promising option for submicron particulate (PM1) reduction. This study addressed the effects of coal blending on the formation and properties of particulate matter in combustion process. Coal blends from lignite and bituminous coal,with different blend ratios (9:1,7:3,5:5,3:7 and 1:9),were combusted in a drop tube furnace. The mass size distribution,concentration,elemental composition and morphology of the particulate matter generated under O2/N2 and O2/CO2 conditions were characterized. Particulate matter was collected by a low pressure impactor (LPI),which aerodynamically segregated particulates into thirteen fractions with sizes ranging from 0.03 to 9.8 μm. The results showed that coal blending reduced PM1 generation,compared with the calculated average values from the combustion of constituent coals. This indicated that the mineral interactions had a great effect on PM1 reduction. The blend ratio also played an important role in the suppression of PM1 genera-tion. In this experimental study,PM1 generation suffered a maximum suppression at the blend ratio of 7:3. The O2/CO2 atmos-phere affected the formation and properties of the PM1 during coal blends combustion. Compared with the O2/N2 combustion,the interaction of minerals was weakened under O2/CO2 combustion,thus the suppression of PM1 generation decreased after coal blending. Compared with the calculated values,the concentrations and percentages of Ca,Fe in PM1 decreased,but the concentra-tions of Ca,Fe,Si and Al in coarse particulates (PM10+) increased after coal blends combustion. The interactions between the aluminosilicates in the bituminous coal and volatile elements Ca,Fe in the lignite were thought to contribute to the suppression of PM1 generation during the combustion of coal blends.

关键词：煤燃烧过程颗粒物质 O2/CO2气氛混合比例性能可吸入颗粒物相互作用混煤燃烧

Mapping of QTL conferring leaf rust resistance in Chinese wheat lines W014204 and Fuyu 3 at adult plant stage

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2016年第1期15卷 18-28页

作者： QI Ai-yong zhanG Pei-pei ZHOU Yue yao zhan-jun LI Zai-feng LIU Da-qun Department of Plant Pathology College of Plant Protection Agricultural University of Hebei Department of Biochemistry Baoding University College of Agronomy Agricultural University of Hebei

Wheat leaf rust is a destructive foliar disease of common wheat （Triticum aestivum L.） worldwide. The most effective, economical s to control the disease is growing resistant cultivars with adult plant resistance （APR）. The Chinese wheat tines W014204 and Fuyu 3 showed high leaf rust resistance in the field. To identify leaf rust APR genes in the two lines, two mapping populations with 215 and 163 F2：3 lines from the crosses W014204/Zhengzhou 5389 and Fuyu 3/Zhengzhou 5389, respectively, were phenotyped for leaf rust severities during the 2010-2011, 2011-2012 and 2012-2013 cropping seasons in the field at Baoding, Hebei Province, China. A total of 1 215 SSR markers were used to identify the quantitative trait loci （QTLs） for leaf rust APR in the two populations. In the W014204/Zhengzhou 5389 population, three QTLs were detected and designated as ***-lBL.1, ***-2BS.1 and ***-7DS, and explained 2.9-8.4, 11.5-38.3 and 8.5-44.5% of the phenotypic variance, respectively; all the resistance alleles at these loci were derived from W014204. In the Fuyu 3/Zhengzhou 5389 population, three QTLs, ***-lBL.2, ***-2BS.2 and ***-7BL, explained 12.0-19.2, 22.3-38.9 and 4.1-4.3% of the phenotypic variance, respectively, and all resistance alleles were contributed by Fuyu 3. Based on chromosome positions of closely linked markers, both ***-lBL. 1 and ***-lBL.2 are Lr46, and ***-7DS is Lr34. ***-7BL was mapped on chromosome 7BL near to Lr68 and they are likely the same gene. Based on chromosome positions, pedigree and field reactions, the two 2BS QTLs are different from all the known APR genes and are likely to be newAPR QTL for leaf rust. These QTLs and their closely linked markers are potentially useful for improving leaf rust resistance in wheat breeding.

关键词： Triticum aestivum Puccinia triticina APR SSR marker

Back Frame Section Size Optimization of Large Aperture Telescope

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2023年第4期30卷 76-84页

作者： Qinglong Wu zhan yao Tanhui Wu Yangqing Hou Huazhen zhang Qian Xu Na Wang Shanghai YueSheng Information Technology Co Ltd.Shanghai 201109China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

The back frame structure of a large radio telescope is an important component supporting the reflecting surface,which is directly related to the surface *** optimal design is of key significance for ensuring the surface precision and reducing structural *** methods are constructed to optimize the cross-section size of the telescope back frame in this paper,the criterion method and the first-order optimization *** criterion method is based on the Lagrangian multiplier method and Kuhn-Tucker *** method first establishes the mathematical model by taking the inner and outer radiuses of the back frame beams as the design variables,the structural weight as the constraint condition,and the structural compliance as the objective function,then derives the optimization *** first-order optimization method takes the inner and outer radiuses of the beams as the design variables,the back frame RMS as the objective function,and the structural weight as the constraint *** of RMS,structural stress uniformity and optimization efficiency shows that both algorithms can effectively reduce structural deformation and improve RMS,but the criterion method has relatively better result than the first-order method.

关键词： radio telescope back frame size optimization RMS criterion method first-order method

在线全文

学校读者我要写书评

暂无评论

风电零部件耐磨涂层的涂装及应用

涂料工业 2012年第12期42卷 58-60,71页

作者：詹耀广东明阳风电产业集团有限公司广东中山528437

根据风电机组法兰面的耐磨性能要求,从理论和实验方面分析了水性无机富锌漆的技术性能,通过实验验证了水性无机富锌漆的耐磨性能,归纳和总结了耐磨涂层的施工方法和检测要点。

关键词：耐磨涂层水性无机富锌漆性能和特点涂装方法

在线全文

学校读者我要写书评

暂无评论

中国服务进出口贸易与经济增长的协整关系

山西财经大学学报 2009年第10期31卷 53-63页

作者：姚战琪中国社会科学院财政与贸易经济研究所北京100836

本文从服务贸易出口、服务贸易进口与GDP作为一个系统中相互决定和相互依存的内生变量角度构造动态模型,以此分析相互联系的变量间的互动关系和内在影响机制,并分析随机扰动对变量系统的动态冲击。本文分析和论证了:(1)服务贸易进口和... 详细信息

本文从服务贸易出口、服务贸易进口与GDP作为一个系统中相互决定和相互依存的内生变量角度构造动态模型,以此分析相互联系的变量间的互动关系和内在影响机制,并分析随机扰动对变量系统的动态冲击。本文分析和论证了:(1)服务贸易进口和出口均与中国经济总产出正相关,但服务进口与总产出的相关系数大于服务贸易出口与总产出的相关系数;(2)短期内,服务出口对经济增长具有促进作用,但长期作用不明显,在未来较长时间内,服务贸易进口与国内经济增长仍将保持较强相关性;(3)从基于VAR模型的格兰杰因果关系检验结果分析,实际服务贸易出口和服务贸易进口不是实际GDP增长的Granger原因,实际GDP是引起实际服务贸易进口和出口的Granger原因,实际进口是引起实际出口增长的Granger原因,但出口不是引起进口的Granger原因。

关键词：服务贸易服务业协整检验向量误差修正模型

技术进步与服务业的融合和互动——基于中国投入产出表的分析

在线全文

学校读者我要写书评

暂无评论

财经研究 2008年第7期34卷 39-50页

作者：姚战琪中国社会科学院财政与贸易经济研究所北京100836

文章从分析投入产出表的视角出发,探讨技术进步与中国服务业融合和互动的实际表现。通过对典型年份服务业直接消耗系数的对比,发现大多数服务部门来自高新技术产业投入的比重都有不同程度的上升。从服务业影响力和感应度角度进一步验证... 详细信息

文章从分析投入产出表的视角出发,探讨技术进步与中国服务业融合和互动的实际表现。通过对典型年份服务业直接消耗系数的对比,发现大多数服务部门来自高新技术产业投入的比重都有不同程度的上升。从服务业影响力和感应度角度进一步验证了随着服务业与技术进步和现代高新技术产业的融合程度的加强,服务业与其他产业的关联更加紧密的结论。计量分析结果与服务业发展的事实相符,即在技术进步的推动下服务业要素投入结构向资本劳动比不断上升的方向转变,其直接表现是对高新技术产业和产品的投资需求增大。通过对服务业各个部门影响产出增长的技术进步因素进行分解,认为运输邮电业、公用事业及居民服务业、金融保险业等部门的技术变化贡献对产出的影响主要取决于自身技术变化情况,而国民经济整体技术进步对其产出的贡献处于次要位置,商业饮食业则相反。最后,提出促进服务业与技术进步融合及互动发展的对策和政策建议。

关键词：技术进步服务业投入产出表高新技术