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The effect of reaction temperature,reaction time,materials ratio on the synthesis of piperidine alcohol benzoate ,hindered amine light stabilizer,from piperidine alcohol and benzoyl chloride by direct condensation were studied,and the proper technological conditions were given as follows:the reaction temperature is 95℃;reaction time is 4 h; the mole ratio of reactants,n∶n is 1∶1.4,the amounts of solvent is 40 mL(based 0.1mol piperidine alcohol),the arerage yield ...

王树清，高崇，苯甲酸哌啶醇酯HALS的合成工艺研究研究了以苯甲酰氯和哌啶醇为原料直接缩合合成苯甲酸哌啶醇酯受阻胺光稳定剂时反应温度、反应时间、原料配比等条件对合成反应的影响，确定了最佳工艺条件。最适宜的工艺条件是：反应温度95℃、反应时间6h、原料摩尔比n∶n为1∶1.4，溶剂用量为70mL(相对于0.1mol哌啶醇)，苯甲酸哌啶醇酯的收率为91.05%，产品纯度98.5%。

The optimal esterfication reaction conditions as following, the esterification temperature is 115℃, the initial mole ratio of benzyl chloride to sodium formate is 1:1, the volume ratio of water to benzyl chloride is 1:1, and the catalyst amount is 2% according to the quantity of benzyl chloride.

确定最佳的酯化工艺条件为：温度115℃，氯化苄与甲酸钠的摩尔比1：1，氯化苄与水的体积比1：1，催化剂量为氯化苄重量的2%。

It is meaning to research on the compressive characteristic of concrete small hollow block walls with concrete core columns in order to make use of the material well and improve characteristic of the walls.To concrete small hollow block walls, five modes of block walls of different ratio of height to width have been made. The Characteristic of the block walls of different ratio of height to width with horizontal load and vertical load have been analyzed.

对不同的高宽比的砌块砌体墙在不同的竖向荷载作用下的水平抗剪性能进行了数值分析，计算了墙体的水平开裂荷载和破坏荷载，模拟了墙体从开裂到破坏的全过程，分析了不同的竖向荷载和不同的高宽比对墙体水平抗剪性能的影响。

By comparing the error correction capability and stability under different signal-to-noise ratio conditions, and packet loss rate of the block code and the convolutional code in the same signal-to-noise ratio condition, the results show that correcting ability of this algorithm is better than that of other method under the low delay condition, and it can adapt the different network delay condition.

通过对比在不同的信噪比条件下卷积码的纠错能力和稳定性，以及在相同信噪比的情况下对分组码和卷积码的丢包率，说明本文算法的纠错能力在低解码延迟条件下好于现有方法，能适应不同的网络延迟条件。

The slip ratio fuzzy logic controller can assure wheels work with optimal wheel slip ratio and the braking torque distribution fuzzy logic controller can dynamic adjust the braking torque based on the braking system requirement.

针对不同的路面附着情况，建立了不同的模糊控制规则库，并对CBCS控制策略和FCS策略的仿真结果进行了对比分析。

Railway bridge ; braking force ; theoretical analysis ; dynamic calculation ; real-bridge test ; maximum braking force ratio ; effective braking force ratio

铁路桥梁；列车制动力；理论分析；动力计算；实桥试验；最大制动力率；有效制动力率

Aiming at this problem, firstly, calculation formulae of utilization adhesion coefficient after installment of retarder were detailedly deduced. Then braking force distribution ratio , braking intensity and vehicle full-load parameters were taken as variables and inequalities which are about of retarder braking force , braking force distribution ratio , braking intensity and vehicle full-load parameters were established based on the ECE Law. The range of corresponding to any , as well as the most optimal matching between them, were obtained by solving these inequalities.

为此，论文在推导了安装缓速器后前、后轴利用附着系数、的计算公式基础上，基于ECE法规要求，以制动力分配比、制动强度及车辆满载参数为变量，建立了缓速器制动力关于车辆制动力分配比、制动强度和满载参数之间的多元不等式组，通过求解多元不等式组获得缓速器制动力与制动力分配比之间的取值关系，并从中得到二者之间的最优匹配。

The results indicated that infection ratio was decreased and there were significant disease controlling effect on seed rot, bud rot and root rot caused by pathogenic fungi after the seeds soaked by La. Thus, the germinating ratio of herbal plant isatis indigotica Fort.

结果表明稀土镧浸种能明显地减少病原菌的侵染，对由其所造成的种腐、芽腐及根腐等有显著的防治效果，提高了板蓝根和高羊茅种子的出苗率。

From the point of view of structure,bamboo cell wall ratio,amount of bundle per unit area,fraction of bundle sheath,fraction of vessel increase from the root to the top of the bamboo,while fractionof parenchyma.Single bundle sheath area decreases with the increase of height.Fiber length,fiber width and vessel length increase from the root to the top andget theirs maximum value at the length of 17th node to 23rd node and thendecrease.Fiber length and width ratio slightly decreases while vessel widthincreases with the increase of height.

从构造角度来说，竹材胞壁率、单位面积维管束个数、纤维束比量、输导组织比量从基部到到梢部随着高度增加而增加，而薄壁组织比量、单个维管束纤维束面积随着高度增加而减小；纤维长度、纤维宽度、导管长度从基部到梢部随着高度的增加而增加，在第17竹节到第23竹节达到最大值，而后下降，纤维长宽比随着高度的增加而缓慢下降，导管宽度随着高度增加而一直增加。

The physical and mathematical models of the system energy change ratio and energy-destruction ratio are set up.

运用热力学的外界分析法，对在部分离峰蓄冷方式下直接蒸发冰蓄冷空调系统进行了分析，建立了系统值变化率、损变化率的物理数学模型，揭示了系统运行方式的热力学特征。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。