Experimental Study on the Shear Distortion of the Discontinuity of ZHAIBA Landslide in the Yunyang City

In order to analyze the stability of the landslide, it is important to make the shear strength test to discontinuity of the landslide. So, we must use a method of simpleness, practicality and speediness to determine the shear strength of the discontinuity. Using homemade shear equipment, the authors make shear strength test to model from landslide of ZHAIBA under different situation. After analyzing the experiment data we conclude that the shear strength of the discontinuity is relevant not only to compressive force but also to containing water of the discontinuity, Shear strength will rise as compression force rise and will reduce as containing water of the discontinuity rise.     

Deformation equations of thin-walled open-profile members considering distortion and its application

In order to simplify the analysis of thin-walled open-profile bars, a method is presented in which the analysis is split into two parts, dominated by in-plane and out-plane loading effects respectively. This article focuses on the out-plane loading effects. Based on bending theory of thin plate with small deflection, each slab or strip is analyzed separately and the results are integrated into vectors, in which, the deformation shapes and equilibrium conditions are simplified appropriately, thus leading to the slabs' out-plane bending resistance system of thin-walled bars, which reflects the properties of the bar's distortion and torsion. By composing the slabs in-plane tension-bending resistance system and the slabs' out-plane bending resistance system, deformation equations of thin-walled open-profile bars considering distortion are deduced. In order to set up the finite bar element method, stiffness equation and equivalent nodal forces of internode loadings are deduced. Comparative analysis with finite shell element method indicates the high efficiency and accuracy of this method.     

The use of Rapd markers for lentil genetic mapping and the evaluation of distorted F2 segregation

To maximize the extent of polymorphism within a mapping population wide crosses are often made, frequently resulting in distorted segregation. Two parents used in the crosses in this study contained ca 50% from wild lentil genome (Lens culinaris ssp. Orientalis). We investigated the use of random amplified polymorphic DNA (RAPD) in the lentil (Lens culinaris Med.), for genetic mapping and testing for segregation distortion in F₂ populations. In cross 1, 83% of the RAPD markers showed segregation distortion, which was also observed for isozyme and morphological loci. By contrast, in cross 2, there was little (10%) segregation distortion. Out of 390 primers tested, 116 primers (29.7%) yielded 192 polymorphic fragments between parents of cross 2. This polymorphism was confirmed as reproducible. Seventy-eight segregating loci were analyzed for linkage, at a LOD score > 3.0, resulted in 28 RAPD, one RFLP, one morphological and three oligonucleotide markers, which were assigned to 9 linkage groups spanning 206 cM. Clearly, in lentil RAPD markers were valuable for genetic mapping and evaluation of segregation distortion. This revised version was published online in July 2006 with corrections to the Cover Date.     

水稻显性雄性核不育基因鉴定初报

1978年我所用栽野型组合(萍矮58×华野)F_2中的无花粉型不育株与反交组合(华野×萍矮58)F_4中的正常株杂交,后代出现典败型变异株。经13个世代观察,该不育材料的测交、回交、姊妹交(不育株×可育株)F_1分离出的不育株与可育株呈1∶1;可育株自交后代育性不分离;“不育株”幼穗分化期在高温下(白天平均温度30℃以上)有部分结实,     

气体渗碳淬火对齿轮精度的影响

通过对齿轮采用不同的预备热处理、最终热处理、吹砂时不同的压力大小及齿轮在炉中不同的摆放位置对齿轮变形的影响,从而确定了采用等温正火作为预先热处理、软氮化作为最终热处理、轻吹及水平摆放有利于提高并保持齿轮精度。     

夹层杆系结构的位移计算

本文从理论角度论述了夹层杆系结构位移的计算,剖析夹层材料与固定板之间共同工作杆 系的内力和变形关系。     

原核表达dsRNA抗番木瓜畸形花叶病毒的研究

番木瓜畸形花叶病毒(Papaya leaf distortion mosaic virus,PLDMV)是一种已对番木瓜种植业构成潜在威胁的新型病害,在转基因植物备受争议的背景下,利用原核表达的dsRNA来防控病毒的策略不失为一种新的选择。本文选取PLDMV CP基因全长(879 bp),运用OZ-LIC法构建了含有pdk内含子的ihpRNA结构,将其嵌入原核表达载体pSP73中,并转化RNaseⅢ缺陷型大肠杆菌M-Jm109LacY,构建了1种能高表达dsRNA的原核表达菌株M-Jm109LacY-CP879,以终浓度为0.4 mmol/L IPTG诱导后能够稳定高效的表达CP879-dsRNA。研究共设2个处理:保护性处理与治疗性处理。分别用含有CP879-dsRNA的粗提液对这2个处理的番木瓜植株进行喷施处理,通过统计发病率、观察病症变化以及ELISA分析结果表明,保护性处理能有效抑制番木瓜畸形花叶病毒的侵染,主要表现为发病时间推迟和相对较低的发病率;治疗性处理植株的病毒积累量会在喷施后第3~12天内出现暂时性的降低。结果表明,保护效果优于治疗效果,若每月喷施2~3次dsRNA粗提液,有望能够有效地预防PLDMV的侵染。     

企业会计信息失真问题研究

会计信息是经济信息的重要组成部分, 在现代经济管理中处于中心和主导地位。但由于受到传统行为的影响和个体利益的驱动, 当前一些企业会计信息失真现象比较严重, 为此, 很有必要对企业会计信息失真的现状、危害、成因及治理对策进行深入的调查研究。     

农垦58S／农垦58 F2群体育性分离模式的年度间差异

 分别于1989和1992年盛夏在杭州（30°05' N）自然条件下观察了农垦58 F₂群体的育性分离情况。结果表明，该组合F₂群体育性分离模式年度间差异大，在1989年凉夏期间群体内育性分离偏于可育部分，而在1992年炎夏期间则偏于不育侧。斯米尔 诺夫检验表明，上的育性分布差异明显（P＜0.01）。这种育性分离模式的年度间偏差被归为环境温度等条件对光敏雄性不育遗传表达影响的结果。认为在自然条件下应用经典遗传学方法研究光温敏雄性不育的遗传是不合适的，提出了深入研究光温敏雄性不育遗传的可能性。     

水稻亚种间杂种后代Pgi-1同工酶的异常分离

 采用籼稻品种与粳稻品种或偏粳型广亲和性品种的杂交后代F₂集团8个，分析了位于第3染色体上的Pgi-1同工酶的分离情况。其中4个F₂集团表现为显著或极显著偏离正常的孟德尔分离比例，带粳稻标记基因Pgi-1的配子明显减少，只占总受精配子的41.4%±2.8%。而另4个F₂集团则保持正常分离比例。分析结果表明， Pgi-1的异常分离与雌性育性无关，也不是由于花粉形态性败育而致，在第3染色体Pgi-1附近，存在一个独立于ga-2和ga-3的新的配子体基因，控制花粉的受精竞争。在该配子体基因位点上，一些粳稻品种或偏粳型广亲和性品种具有的等位基因可以消除籼粳交后代中由于受精竞争而导致的粳配子败育。