直列4缸内燃机双轴平衡系统设计

直列4缸平面布置曲轴内燃机存在不平衡的二阶往复惯性力,采用兰氏双轴平衡系统,可以平衡二阶往复惯性力,使内燃机的噪声和振动明显下降。     

铁锰营养失衡对商陆根系分泌物的影响

以商陆为实验材料,用水培方法设置了8个实验处理:Fe0Mn0(对照),Fe0Mn-,Fe0Mn ,Fe-Mn0,Fe-Mn-,Fe-Mn ,Fe Mn0,Fe Mn-,Fe Mn 。处理30 d时,对根系分泌物中可溶性糖、总氨基酸、pH值以及根系质膜透性进行测定。结果表明,Fe-Mn-的可溶性糖含量稍高于对照,其余各处理组均低于对照,Fe0Mn ,Fe Mn 达到显著水平;氨基酸含量在铁锰失衡条件下普遍有所增加,其中Fe-Mn0分泌的氨基酸含量最大,与对照差异显著;除Fe0Mn 外,各处理组的pH值与对照组相比都显著增加,其中以铁毒处理组(Fe Mn0,Fe Mn ,Fe Mn-)的增加率最高;铁毒处理组(Fe Mn0,Fe Mn ,Fe Mn-)使商陆根系质膜透性增加,对商陆根系造成一定的伤害。总体而言,铁锰的缺乏或过量都会引起商陆根系分泌物含量的变化,其中以铁胁迫和锰毒对其影响最大;另外,相对单铁或单锰处理而言,铁锰之间的交互作用对商陆根系分泌物的变化也有一定的影响。     

直列四缸柴油机二阶往复惯性力平衡机构开发及刚度校核

通过计算,校核了双轴平衡机构中平衡轴的受力及其弯曲变形量,为整体方案的选择和确定提供了参考。     

奶牛日粮配方养分诊断系统的应用

大部分奶牛日粮配方软件只考虑几个重要的养分指标参与优化计算,很难系统考虑所有养分指标。作者开发的奶牛配方诊断软件可以根据日粮的饲料组成,通过100多个养分指标全面估测日粮实际达成奶牛营养需要及养分间的平衡性,并对生产性能作初步预测。作者以奶牛代谢蛋白质平衡为例,利用日粮诊断软件对奶牛日粮中蛋白质平衡的实例进行计算和分析。     

The Optimal Method of Calculation of Earthwork Volume of Transformer Substation

With the development of electric power industry, more and more projects of building transformer substation need a great deal of fund. More exact evalution of projects becomes more important.In evalution of projects, calculation of earthwork volume may be a very important part.According to the requirement of most projects and on the basis of traditional method , we have created a new method of optimal calculating earthwork and auto-balance. Minute-dividing technology and interpolating way are used to enhance the simulation of Grids.The new method can better simulate the landform and more effectively promote the precision and speed of calculation of earthwork .Auto-Balance can do what can't be reached by manual work.     

LR4105柴油机二阶往复惯性力的计算分析

4缸柴油机的二阶往复惯性力是产生振动的主要原因,LR4105柴油机通过双轴平衡机构来平衡二阶往复惯性力,取得了较好的效果。     

System simulation for COREX process: model descriptions

System simulation for COREX process not only gives guidance for its development, but also produces a theoretical basis for the design of its computer control system. A composite model for computational analysis on COREX process of ironmaking has been developed. The model combines a set of common material and heat balance equations, chemical equilibrium equations, and other considered correlations.These equations or correlations are coupled together through the material flows and energy flows between each two of all reactors in COREX process. All parameters are calculated based on one ton hot metal. The consumptions of ore and flux, the quantity of slag, and the composition of slag are calculated using the mass conservation for the element of Fe and the oxides such as CaO、MgO、SiO2、Al2O3、MnO and P2O5, etc. The gas volume and composition are calculated using the mass conservation for the elements of C and H and the chemical equilibrium of water gas reaction, etc. The O2 consumption is calculated using the conservation of the element O. The coal consumption is calculated by using of heat balance for the melter gasifier.     

柴油机双轴平衡系统轴承设计

采用兰氏双轴平衡系统,可以平衡二阶往复惯性力,使柴油机的噪声和振动明显下降。平衡轴及其轴承的设计对系统的工作可靠性和使用寿命有重要影响。