基于特征编码的拉深件CAPP信息模型

此文在分析拉深件零件特点的基础上,对其特征的信息构成进行了研究。采用成组技术,提出了一种特征编码的信息表达方式。该方式不仅可以方便地实现零件的自动工艺设计,而且还可实现零件的成组工艺、模具的成组设计,从而缩短产品的生产周期,降低成本。     

等重下料技术及其工程化应用

简要介绍了应用于大直径棒料下料的等重下料技术 ,该项技术系现代光电传感技术及计算机控制技术在传统技术领域的应用。在弹体毛坯生产线上 ,首次实现了实时、快速、准确的全自动在线下料检测和控制 ,取代了原有人工下料过程。该项技术在其它制造加工领域也具有广阔的应用前景 ,对提高劳动生产率 ,节约原材料具有重要的经济意义。     

Cold-modeling study of a circulating fluidized-bed reactor for flue gas desulfurization (FGD)

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产生全雄子代罗非鱼亲本的分子标记及其遗传多样性分析

通过1对1的配对实验,选取产生全雄性杂交子一代的奥利亚罗非鱼和尼罗罗非鱼亲本,对其进行RAPD分析.在40个引物中筛选出22个重复性好的引物用于两个亲本群体的分子标记和遗传多样性研究,其中5个引物(S236、S328、S471、Opz6、Opz8)扩增出的特异性DNA片段,可以作为区分两个亲本群体的分子标记.在奥利亚罗非鱼群体内,共检出133个位点,多态位点数15,多态位点比例为11.28%,在奥利亚罗非鱼群体内,共检出134个位点,多态位点数26,多态位点比例为19.40%.两个亲本群体内较高的遗传相似指数(S分别为0.9787、0.9462),说明两个群体内的遗传变异较小,纯度高;奥利亚罗非鱼和尼罗罗非鱼的种间遗传距离较大(D=0.2595),表明有产生较强杂种优势的可能     

与甘蔗抗黑穗病基因连锁的RAPD标记筛选

为了寻找与由黑粉菌(Ustilago sictaminea Syd．)引起的甘蔗黑穗病抗病基因连锁的分子标记，从而借助分子标记辅助选择(MAS)手段提高抗病育种效率，用甘蔗抗病亲本Co1001为母本，用感病亲本Ya71-374为父本，配置杂交组合创制抗病性分离群体为材料，采用人工接种新植蔗，田问种植方法鉴定分离个体新植和宿根的抗病性，借助RAPD和集群分离分析法(BSA)，筛选出一个与抗病基因连锁的多态性片段，并在抗、感池中的个体和池外部分个体上得到验证，该片段大小约520bp．对该片段的进一步克隆、测序和转换研究还在进行中，研究结果为抗病育种的MAS奠定了基础．图2表3参12     

不同DNA分子标记在云杉属植物遗传多样性研究中的应用

综述国内外近20a来在DNA分子水平上埘云杉属植物遗传多样性的研究进展，简述用RELP、RAPD、SCAR、AFLP、SSR、EST、STS以及SNP标记对于云杉属核DNA、线粒体DNA、叶绿体DNA和rDNA多态性进行的研究以及在云杉属品种鉴定、遗传作图、遗传多样性、进化及分子生态学研究中的应用，参85     

A Numerical Study of the Dynamics of the Riverine Thermal Bar in a Deep Lake

A numerical model based on a Finite Volume formulation of the Navier–Stokes equations is used to simulate a range of scenarios leading to a thermal bar formed by a river inflow to an idealised deep lake. The results presented here show that small riverine salinity increases have a profound effect on the dynamics of the thermal bar, suppressing horizontal propagation of the plume and raising the possibility of a thermal bar which is capable of sinking to great depths. This finding is particularly relevant to Lake Baikal in Siberia, where the vigorous deep-water renewal is still not fully understood. An analysis of the buoyancy forces governing the depth of penetration of the thermal bar plume shows that realistic salinity gradients are an important factor in determining the circulation of Baikal waters. Observations of the saline curtailment of the thermal bar's horizontal propagation also reveal a potential for reduced productivity in the ecosystem of any temperate river delta during the Spring renewal period.     

A Model of the Thermal Bar in the Rotating Frame Including Vertically Non-Uniform Heating

Small bottom slope, inviscid solutions are found for a model of the temperature and circulation structure of the thermal bar system. This model includes Coriolis effects, a vertically non-uniform heat input and is axisymmetric. The model also includes general topography and time dependent heating. These solutions include inertial oscillations that have a significant effect on the circulation, especially for the case when the heating is instantaneously applied.     

Effects of grassland degradation on chestnut soil properties in Bashang Plateau, China

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Life cycle assessment for municipal solid waste treatment and utilization

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