云南高原粳稻抗白叶枯病新品系云资抗21号的选育   总被引：1，自引：0，他引：1  

徐福荣  汤翠凤  余腾琼  叶昌荣  戴陆园 《分子植物育种》2005,3(3):307-313

以高产优质的云南高原粳稻品种滇系4号为轮回亲本，以IRBB21为白叶枯病抗性基因Xa21的供体亲本，通过杂交和3次回交以及5次自交形成BC3F，代材料，并结合后代材料的白叶枯病抗性鉴定及农艺性状的评价选择，选育出高原粳稻新品系云资抗21号，对云资抗21号的21个单株采用与Xa21连锁标记RM21和RM229、以及22个独立分离的SSR标记进行检测，结果表明这21个单株在RM21位点上均为IRBB21的纯合基因型，在RM229位点上有1个单株显示为轮回亲本的纯合基因型，其余的20个单株均为IRBB21的纯合基因型，而在其余22个SSR标记位点上均显示为轮回亲本的纯合基因型。该新品系白叶枯病抗性与IRBB21相近，农艺性状与轮回亲本相似，具有很好的应用前景。  相似文献   

Analysis of the Intergranular Fracture Behavior of High Temperature Plastic Deformation of 1420 Al-Li Alloy     

LIU Xue-feng  WANG Ling-yun  HUANG Guang-jie 《保鲜与加工》2001,(3):127-131

  相似文献   

Quantitative Analysis of Flavones in the Ginkgo Biloba Extract by High Performance Liquid Chromatography     

ZHU Lian-cai~ 《保鲜与加工》2006,(1):117-119

  相似文献   

Research and Development of a Quality Control System in Construction     

GUO Ping  WU yuan hong  YAO Gang 《保鲜与加工》2002,(12):74

In the civil industry, quality is a key factor, so quality management and quality control play decisive roles in construction especially. At present, the main method of construction is quality controlling that engineers and technicians consult the standard and norm concerned, then check them one by one, and supervise the construction. It is not only inefficient but also easy to make mistake. Using computer technology in the quality control of construction will promote quality control level and improve management measures. Through the research of the quality control of construction,the system of quality control in construction is studied and developed, the structure of the software and its developed technology are expounded.  相似文献   

Stability Analysis on Excavated High Slope of Mozong River Power Station in Wulong     

ZHANG Yong-xin  WEN Hai-ji  WANG Gui-lin  DU Tai-liang 《保鲜与加工》2002,(4):96-100

The subject matter of this paper is to analyze the stability of excavated high slope. On the base of typical engineering case in Wulong, Chongqing, the geological conditions and potential failure pattern of the high slope are discussed. Then, the limit equilibrium method and the stereographic projection method are used to synthetically analyze the stability of excavated high slope. As a result, it indicates that the stability of the high slope in insufficient and some retaining structures ought to be adopted for the high slope as soon as possible.  相似文献   

Study on Design of Bio-clean Operating Room     

YANG Zhi wei  LI Bi yu 《保鲜与加工》2001,(4):20-25

The design of Bio-clean operating room in modern hospital is quite different from that of traditional operating room. This paper discusses three aspects of Bio-clean operating room design: air clean standard and air purification, interior equipment system and interior finish. It is hoped that this discussion will conduce to later designs.  相似文献   

Artificial Neural Networks Models for Flow Stress during High Temperature Plastic Deformation of Al-Li Alloy     

LIU Xue-feng  WANG Ling-yun 《保鲜与加工》2001,(2):68-71

Using gained experimental data to develop the models of stable flow stresses at high temperature plastic deformation by statistical methods for alloy materials, precision of the models is poor and at the same time the processes of modeling are complicated with great workload. On the basis of the data obtained on Gleeble-1500 Thermal Simulator,the predicting models for the relation between stable flow stress during high temperature plastic deformation and deformation strain, strain rate and temperature for 1420 Al-Li alloy have been developed with BP Artificial Neural Network method. The results show that the model on basis of BPNN is practical and it reflects the real feature of the deforming process. It states that the difference between the real value and the output of the model is in order of 5 percent.  相似文献   

Influence of HVDC System on the Shaft of Hydro-generator Unit     

XU Yuan-yuan  LIAO Yon  CHEN Guo-qing  XlANG Da-wei 《保鲜与加工》2006,(1):36-40

Widely concerns of the influence of the HVDC system on the Three Gorges power station have been shown so far. Based on the understanding of the mechanism of the non-characteristic harmonics introduced by HVDC system, the influence of interharmonics on the shaft of hydro-generator unit is studied. A MATLAB simulation model for the Three Gorges hybrid AC and DC transmission system with considering the effect of generator-unit shaft is established. Through time-domain simulation, the influence of the minor-associated component of interharmonics on the generator-unit shaft is analyzed, which arise from the asynchronous operation of the HVDC system. Also, the complex torque coefficient method in frequency-domain is used to analyze this problem. Same conclusions can be drawn from the results of timedomain and frequency-domain analyses.  相似文献   

Simulation Propagation of Partial Discharge UHF Signals in Transformer     

MENG Yan-hui  TANG Ju  XU Zhong-rong  ZHANG Xiao-xing  HU Jing-jing 《保鲜与加工》2007,(5):70-74

Many factors affect the propagation of ultra high frequency(UHF) signals caused by partial discharge(PD) on the waveforms and energy of signals in transformer.To investigate the relationshi Pof factors and UHF signals,simulation model of transformer for PD study are established.UHF signals in simulation model of transformer caused by PD are calculated using finite difference time domain method.By means of amplitude and cumulative energy plot of simulation signals,and combing the measured result,the following factors:distance between PD source and detection position,different metallic conductor position around detection position and iron core and winding are researched,which contribute to comprehend the propagation characteristic of UHF signals and detect UHF signals accurately.  相似文献   

The Application of Pre-splitting Blasting to Excavation on High Slope in Soft Rock Section     

KANG Hui ming  LI Xiao hong  LI Tong lin  JIN Xiao guang  LU Yi yu 《保鲜与加工》2001,(1):47-50

Based on analyzing about blasting mode of slope in the construction of road, the paper shows that pre splitting blasting is mostly suitable in the section of severely weathering soft rock with developed joints and fractures, introduced the laying out about the hole of pre splitting blasting that can apply in the high slope of the expressway in the section, and designed the parameter. The practice shows that it gained favourable effect by this method.  相似文献