基于质量安全的农产品供应链契约模型

运用3阶段动态博弈框架,针对供应商和销售商的质量安全行为特征,分别建立了基于质量安全的农产品供应链契约模型,探讨了契约中影响契约设计、选择和执行的因素,并给出了算例分析。     

绵羊BMPR-IB基因在分子标记育种中的应用效果

[目的]分析小尾寒羊、德国美利奴、德国美利奴(♂)和小尾寒羊(♀)杂交一代(简称DF1)共204 只个体的单核苷酸多态性及其与产羔数间的关系.[方法]以绵羊BMPR-IB 基因作为候选基因,采用PCR-sscp 检测方法.[结果]B等位基因在小尾寒羊、德国美利奴、德寒杂交一代中的频率分别为0.660、0.532和0.600,基因频率及基因型频率在3个群体间的分布差异不显著(P>0.05).BB、B+、++型的产羔数分别为2.86、2.27和2.08,BB 型显著高于B+ 和++ 型(P>0.05),B+ 型显著高于++ 型(P>0.05).[结论]在以小尾寒羊为母本的杂交育种过程中,B等位基因是有效的辅助标记基因.     

硫酸锰浸种对马铃薯幼苗的影响

以"克新13"马铃薯为材料,通过盆栽试验,利用不同浓度的硫酸锰浸种处理,通过测定马铃薯幼苗的株高、茎粗、单株叶面积、叶片叶绿素含量、叶片可溶性糖含量、干物质积累、叶片蔗糖转化酶活性等指标的变化,研究不同浓度的硫酸锰对马铃薯幼苗建成的作用效果.结果表明,适宜浓度的硫酸锰(0.015%～0.045%)能有效地提高叶绿素含量、叶片可溶性糖含量和叶片转化酶活性,促进幼苗株高、茎粗、单株叶面积形成和干物质积累,有利于马铃薯幼苗建成.     

Affine invariant shape recognition with particle swarmoptimization algorithm

Focusing on the problem that affine transformation will exist among the contour images due to variation of the viewpoints, a new approach to extract affine invariant features and matching strategy is proposed for shape recognition. First, the centroid distance and azimuth angle of each boundary point are computed. Then, with a prior defined angle interval, all the points in the neighbor region of the sample point are considered to calculate the average distance for eliminating noise. After that, the centroid distance ratios(CDRs) of any two contour points with angle difference of 180° are achieved as the representation of the shape, which would be invariant to affine transformation. Since the angles of contour points changed non linearly among affine related images, the CDRs should be resampled to build corresponding relationship. It could be regarded as an optimization problem of path planning. In our method, a PSO based path planning model is presented to address this problem. The experimental results demonstrate the efficiency of the proposed method in shape recognition with translation, scaling, rotation, distortion and noise interference.     

MJS水泥土的试桩成桩效果分析

以南京地铁7号线中胜站全断面承压含水砂层MJS加固下穿既有运营10号线车站工程为背景,基于试桩芯样对MJS水泥土试桩成桩效果进行研究,研究不同桩型、不同水泥掺入比、不同地层下各部位MJS水泥土试桩的成桩效果(加固范围、成桩质量、抗压强度、弹性模量、水泥含量),并与室内MJS水泥土强度数据比较.结果表明:全圆桩整体成桩效...     

A New Beam Column Element of Space Framed Structures for Nonlinear Analysis of Geometric Material

An incremental virtual work equation of three dimensional(3D) beam column element is proposed based on the UL method. The geometric nonlinear tangent stiffness matrix for 3D beam column element is deduced with the consideration of warping, shear deformation and effects of moment spatial rotation. Material nonlinearity is addressed by introducing plastic hinges at the element ends. And the Orbison sectional strength is modified in order to consider the effects of torsion moment and warping. The elastic plastic tangent stiffness matrix is acquired as the element ends are in plastic phase based on the flow theory. With a case studied, it is shown that the model can be used to predict accurately the ultimate bearing capacity and instability mode of 3Dspace frames by only one or two elements, and address the effects of warping and shear deformations effectively.     

不同厂家牛黄解毒片质量的灰色模式识别研究

在灰色关联分析的基础上,构建了一个评价中药质量的模式识别模型,并将其用于不同厂家牛黄解毒片质量的评价。综合评价结果与实际情况基本相符。与统计模式识别模型比较,灰色模式识别具有计算简便、适应范围广的特点。     

Legumain对TNF-α和CHX共同诱导的细胞凋亡的拮抗作用

目的探讨Legumain（LGMN）对肿瘤坏死因子-α（TNF-α）和放线菌酮（CHX）共同诱导的细胞凋亡的抑制作用,为进一步研究Legumain在肿瘤细胞生长增殖的分子机制以及相关的肿瘤治疗提供实验基础和理论依据。方法采用Western Blot和水解多肽发色底物法分别测定人胚胎肾（HEK）293细胞株和小鼠成纤维细胞L929细胞株中的Legumain表达量,细胞增殖实验（MTT法）检测Legumain对由TNF-α和CHX共同介导的细胞增殖抑制的拮抗作用,激光共聚焦显微镜和流式细胞技术观察Legumain的抑制细胞凋亡效果。结果实验组中的HEK293＋Legumain细胞和采用AEPI预先处理的L929细胞对一定浓度范围的TNF-α和CHX共同介导的细胞增殖抑制有的拮抗作用（P＜0.01或0.05）;激光共聚焦显微镜观察,Annexin V-PI双染法结果表明实验组的HEK293＋Legumain细胞未发生细胞凋亡现象;流式细胞技术,JC-1染色法测定细胞线粒体膜电位结果表明实验组的HEK293＋legumain细胞的凋亡百分比明显低于对照组（＜0.01）。结论Legumain具有拮抗由TNF-α和CHX共同诱导的细胞凋亡作用。     

不同配方的培养料对秀珍菇生长的影响

以湖南农村富有的几种农产品废料为主要成分.配制了4种培养料基质进行秀珍菇的生产,观察不同配方菌丝体生长的情况并对不同配方培养的秀珍菇进行农艺性状的比较.结果表明,配方A(杂木屑75%,玉米粉5%,米糠18%,蔗糖1%,石灰1%)与配方B(棉子壳98%,石灰1%,蔗糖1%)较适合进行秀珍菇生产.     

大白菜新品种黔白4号的选育

黔白4号系结合贵州大白菜生产实际,采用自交不亲和系A 89213107和D 90212468互为父母本配制而成.该品种具有产量高、抗性强、结球紧实、叶帮较大,品质好、商品性佳等特点.2007年12月通过贵州省农作物品种审定委员会审定.适于贵州大白菜产区及类似生态区种植.