查询词典 aperture ratio

The ratio of downcomer to riser cross sectional area, the bottom clearance and the ratio of height to diameter of the reactor are proved to be important of the cell growth behavior.

下降室和上升室的截面积比，底部系数，高径比这些几何参数和表观气速都与细胞的生长紧密相关。

Analyzing and simulating of the deformation law of the ceramic downspout product after overcoming the shortage of powder material models in the software of MSC. MARC. It shows out the important effects of various factors and the shape of mandril during the process. And it is obvious that the shape of the top mandril has more effects on the process than the bottom.(3) Showing out the important effects of model figure on the flowing of powder and the forming of low-density fields from the analysis. After changing the top of the mandril into spherical shape, an improving model is putting out so that the distribution of stress and strain turns to be even and proper and that the flow rule of powder grains is better.(4) Calculating of the dimensional precision and the cutting ratio of the product and analyzing of the effects of such factors as rubber aging, loading process, mandril, friction etc. on the cutting ratio.

MARC存在的粉末材料模型方面的设计缺陷后，对连铸水口粉末成形件的变形规律及影响因素作用进行了模拟分析，指出芯棒形状对成形件的变形有较大影响，并且芯棒顶部形状与芯棒底部形状相比，对粉末变形有更大影响；(3)分析了成形件出现低密度区域的原因，指出模具形状对粉末流动以及粉末成形件低密度区域的形成有重要作用，提出了密度分布优化改进模型：改进模具顶部形状，并将芯棒顶部设计成球面后，粉末成形件顶部区域的应力、应变分布更加均匀、合理，粉体颗粒流动情况明显改善，低密度区域明显缩小；(4)计算了成形件的尺寸精度及切削率，并指出除模具形状的影响外，充填密度、橡胶模具老化、加载工艺等其他因素对总体切削率也有相当的影响。

ReduceMain fractionation tower,s press drop can enhance inlet pressure of compressor.At the condition of compress ratio is invariable,it can improve system pressure、increase NTS of stabilization tower、reduce stabilize gasoline C4 ratio、improve system absorbent ability.Generic design can hardly reach the best NTS of absorber,so adding absorber,NTS can obviously increase effect so absorb. Because adding absorber'NTS can reduce system dependence on other factors,and it can not lead to the increase of the energy,so it is the best economic method of improving absorb operation effect. For desorber,double feed stream is a economical means but it need adding the NTS.

降低主分馏塔的压降，可以提高压缩机的入口压力，在压缩比不变的情况下提高系统压力；增加稳定塔理论板数，可以降低稳定汽油中C4的含量，系统的吸收效果改善；一般的设计和吸收塔的最佳板数相距较大，所以改造吸收塔的理论板数，它对提高吸收效果往往最显著，又因为改善吸收塔的理论板数会降低系统对其它因素的依赖程度，而且改善它并不增加能耗，所以改造它对提高吸收效果又是最经济的手段之一；对于解吸塔来说，双股进料的工艺很有经济效益，但它需要增加理论板数来实现。

Some conclusions are followed:(1)the reaction ratio of boron is 12% in primary combustion;(2)the degree of agglomeration can be decreased adopting boron coated with AP;(3)the content of oxygen is very important for afterburning efficiency;(4)the afterburning efficiency will be changed with different air-gas ratio;(5)the head distance of after-burning chamber is increasing, the circumfluence in the head of after-burning chamber is stronger and the distribution of fuel backward the after-burning chamber is more well-proportioned.(6)the combustion efficiency of DR will be improved by increasing the area of fuel nozzle.(7)the angle between dual air-inlets have complex influence with the combustion of DR.

通过本项研究，取得如下结论：（1）一次燃烧硼反应比例在12～15％之间；（2）AP包覆硼，可以降低硼结团度，有利于一次燃烧喷射效率的提高，也有利于硼在补燃室进行二次燃烧；（3）进气空气中的氧含量对二次燃烧非常重要；（4）对于一定配方的含硼富燃推进剂，不同的空燃比，二次燃烧效率不同；（5）补燃室头部距离的增加能增强补燃室头部回流以及提高燃料在补燃室后段分布的均匀性；（6）在一定范围内，增加一次燃气喷嘴面积能提高冲压发动机燃料的燃烧效率；（7）进气道夹角对补燃室内燃料的燃烧影响复杂。

Secondly, we choose the proportion of shares held by institutions as dependent variable, and we use log of the total asset, volatility, beta, Jensen Index, debt-to-asset ratio, dividend yield, turnover ratio, years listed in exchange and HS300 Index dummy as explanatory variables. Then we set up a multiple regression model. Finally, we use the cross-sectional data from the end of 2006 to the end of 2007Q3 to test the relationship between the explanatory variables and the proportion held by institutions.

具体方法如下：首先，在已有研究成果的基础上，对我国机构投资者的审慎性持股偏好提出了两个假设；其次，以机构持股占个股流通盘的比例为因变量，以公司的总资产对数值、波动率、贝塔值、Jensen指标、资产负债率、股息率、年度换手率、上市年限为解释变量，并在引入沪深300虚拟变量后，建立了多元线性回归模型；最后，采用我国证券市场迎来历史性大牛市、机构投资者发展最为迅猛的2006年末-2007年3季末的四个横截面数据，对各解释变量与机构持股比例之间的关系进行了实证检验。

The seed-bearing ratio of wheat as an acceptor were highest on plant transformed from 4 to 8 hour after given pollen, but the seed-bearing ratio of durum became dispersing at different time.

结果表明：(1)受体为普通小麦时，在授粉后4~8h转化植株的结实率较高；受体为硬粒小麦时，时间上较为分散。

Laboratory experiments were carried out to study the survival and development of the Harmonia axyridis feeding on Chaito phorus popleti on high insect-resisitance hybrid poplar 741(Pb29) and medium insect-resisitance hybrid poplar 741(Pbl7).The API 741 poplar was used as control.The mortality and development during immature period,adult,baby mass.eclosion and sex ratio of H. axyridis were measured.The results showed that:to contrast The API 741, Chaito phorus popleti on Pbl7 and Pb29 has no significantly impacts on eclosion,pupation, ecdysis,mortality of immature period and pupa stage;Although every development stage of ladybeetles were not affected to ,the pupal duration of ladybeetles was lowered than the control;The body mass,eclosion and sex ratio have no significant difference.

通过利用节肢动物群落及各个亚群落的物种丰富度、个体数、均匀度和优势集中性对多样性指数进行通径分析，表明了高抗Pb29和CK节肢动物群落及各个亚群落多样性指数与均匀度和优势集中性的相关系数最高，与其物种个体数关系最为不密切：对各组分进行通径分析均表明的多样性提高是建立在降低优势集中性和增加均匀度指数的基础上的，而且以优势集中性的直接作用效果较为显著。

In order to produce the billet without surface defect under high casting speed and to raise the ratio of DHR or HDCR operation and reduce defect ratio of the final products, soft contact EMCC (Electromagnetic Continuous Casting) technique by imposing high frequency electromagnetic field on the molten steel meniscus region has been developed. This technique is used to control the initial solidification of the billet.

为了在高拉速条件下生产出无表面缺陷的铸坯，以进一步增大铸坯HDR或DHCR的操作比率、提高最终产品的无缺陷率，连铸技术工作者开发出利用高频交变磁场对铸坯初始凝固过程进行控制的软接触电磁连铸技术。

Electroosmosis technology can solve the problem of high water cement ratio during construction and low water cement ratio during solidification effectively so that have expansive application prospect.

结论电渗滤水混凝土技术能有效地解决混凝土的大水灰质量比施工、小水灰质量比固化的矛盾，有重要学术价值和广阔的应用前景。

The interactions of dsDNA and ssDNA with two osmium complexes have been studied by surface electrochemical methods based on DNA modified electrode. It is found that both osmium complexes bond DNA with electrostatic interaction. And some thermodynamics and kinetics constants, such as bindind constant , ratio of binding constants K〓/K〓, limiting ratio K〓°/K〓°at zero ionic strength (μ＝0), free energy ΔG〓, dissociation rate constant k and binding site size s have been obtained.

研究发现两种锇配合物都是通过静电作用与DNA结合，并计算得到联吡啶锇和二氯菲咯啉锇与dsDNA和ssDNA相互作用的结合常数、结合常数比K〓／K〓、μ＝0时极限结合常数比K〓°／K〓°、结合自由能ΔG〓、解离速度常数k和结合位点数s等多个热力学和动力学参数。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。