合式的

ABSTRACT Immobilized penicillin acylase (from E.coli) was used to catalyze 7 phenylacetamido 3 E propenyl cephalosporanic acid hydrolyzation into 7 amino 3 E propenyl cephalosporanic acid. Then, trans APRA was acylated with hydroxyethyl ester of 4 hydroxy D phenylglycine to obtain trans cefprozil.

以7 苯乙酰氨基 3 E 丙烯基 3 头孢菌素 4 羧酸为原料，在青霉素酰化酶作用下，首先酶法水解得到3 E 丙烯基 3 头孢菌素 4 羧酸，过滤固相酶，滤液调pH分离得到反式APRA固体；在青霉素酰化酶作用下，反式APRA再与对羟基苯甘氨酸乙二醇酯缩合，得到反式头孢丙烯；酶法合成所得的产品与进口反式头孢丙烯对照品一致。

As the complete characteristic curves of reversible pump turbine are often used to calculate the instantaneous parameters, this paper studies the characteristic curve and the wicket closure and opening law in pumped storage plants.Chapter 1 presents the importance and the necessity of this study and reviews the previous related research on hydraulic transient process and valve regulation in pumped storage plants.Chapter 2 analyzes the six collected characteristic curves of reversible pumped turbine and studies their diversification from the point of view of specific speed. The six collected discharge and moment curves with maximum efficiency have been fitted to piecewise continuous curves. This curve-fitting procedure is listed.Chapter 3 takes Liyang Pumped storage plant as an example and analyzes the effect of different characteristic curves on regulation guarantee parameters and the variety of its trochoid during the same operation status.Chapter 4 takes three pumped storage plants with different heads as examples and studies the characteristic of coordinated closure with wicket gate and ball valve and its effect on dynamic pressure in the spiral case, inlet pressure in the draft tube and the rise of rotating speed.Chapter 5 summarizes this paper and point out what should be done in the future research.

由于在过渡过程分析计算中，需要频繁利用可逆式机组的全特性曲线推求机组的瞬时参数，所以本文就特性曲线及关闭规律问题进行了研究，其主要内容如下：第1章，指出本文研究的意义和目的，回顾前人对水力过渡过程、抽水蓄能电站及阀调节的研究成果，在此基础上提出本文的研究内容；第2章，针对收集到的六套特性曲线，从比转速的角度出发来研究可逆式机组特性曲线的变化规律；并对六套曲线的最高效率流量和力矩曲线进行分段拟合，得到各分段函数的具体形式，再通过举例说明最高效率曲线的拟合步骤；第3章，以溧阳抽水蓄能电站为实例，分析讨论不同比转速特性曲线对调保参数造成的影响及对于相同工况其轨迹线的变化；第4章，结合高、中、低三水头段抽水蓄能电站，在导叶直线关闭的基础上，研究导叶与球阀协联关闭规律的特点及对蜗壳动水压力、尾水管进口压力及转速上升造成的影响；第5章，总结全文，提出今后研究的重点和方向。

Muzzle - Medium length, rounded on upper side to fall away abruptly below eyes. Jaws well defined. Underjaw to be strong and have biting power. Lips close and even, no looseness. Upper teeth to meet tightly outside lower teeth in front.

吻中长，圆形，离眼睛的距离要远，下颌要有力，咬合力巨大，剪式咬合，不允许下牙反咬合。

The paper mainly introduces the development and application of the regenerative combustion technology in the walking beam heating furnace of steel rolling and sets forth that the regenerative combustion technology will have more extensive application and commercial value in metallurgical furnace.

介绍了蓄热式燃烧技术在合钢小型连轧步进式加热炉中的开发应用情况，说明蓄热式燃烧技术在轧钢加热炉上具有广泛的应用和推广价值。

As a career in designing and producing the manufacturing equipment of electronic wire and cable, we supply many kinds of twist machine. Our main products are buncher, twist quadding machine, Rigid stranding machine, tube type stranding machine, and com-municating wire and cable stranding machine.

各类绞线，集合机皆为我们的主要产品：除了生产一般大型束绞机，行星式集机，RIGID式集合机，炮筒式绞线机外，我们更生产精密的专业电子，通讯网路线之基础绞合机，包括：供生产高效率，高品质线缆之高速倍绞型对绞机，给线捻返倍绞型星绞机及对绞机。

We immobilized carbonic anhydrase onto the surface of membrane oxygenator of polymethyl pentene to enhance the removal of carbon dioxide in blood by two steps.

采用两步法将碳酸酐酶共价键合在聚甲基戊烯(Polymethyl-pentene， PMP)膜式氧合器表面以提高其清除血液中CO2的能力。

Analyzing the calculating process of belt conveyor with high angle theoretically, starting from its theoretic calculate the cross sectional area of materials and peripheral force, shaft power of drum, power of motor, using point by point method to get the resultant strain of every drum and torsion of driving drum, calculating the maximum strain and the maximum reverse stopping torque, to give the support on theory for using belt conveyor with super-long distance, high angle under the coal mine.

本文针对长运距、大倾角、高强度带式输送机设计过程中存在的问题，从四个方面对大倾角带式输送机进行分析研究：从理论上解析大倾角带式输送机的计算过程，从大倾角带式输送机的理论入手，详细计算物料的横截面面积、圆周力、滚筒轴功率和电机功率，利用逐点计算法计算各个滚筒的合张力以及传动滚筒的扭距，计算出胶带的最大张力和最大逆止力矩，给长运距、大倾角皮带机在煤矿井下的使用给予理论上的支持。

This machine is specially desingned for producing slot-alu insulating glass. this production line comprises the stainless steel washing machine, manual frame mounting station, automatic flat press, automatic tilting table. this production line has many merits.

rdlbp1800型全自动合片、板压中空玻璃生产线 rdlbp1800 insulating glass production line 该生产线是生产槽铝式中空玻璃的专用设备，由高性能不锈钢清洗机、人工上框、自动合片装置和自动出料装置组成。

This machine is specially desingned for producing slot-alu Insulating glass. This production line comprises the stainless steel washing machine, manual frame mounting station, automatic flat press, automatic tilting table. This production line has many merits.

品牌 济南瑞达进料速度 0-15 外形尺寸 1500015002850 功率 15 最小加工面积 500500 重量 4600 加工厚度范围 2-25 RDLBP1800型全自动合片、板压中空玻璃生产线 RDLBP1800 Insulating Glass Production Line 该生产线是生产槽铝式中空玻璃的专用设备，由高性能不锈钢清洗机、人工上框、自动合片装置和自动出料装置组成。

The economy and performance characteristics of LIYANG car equipped with CVT and MT are studied respectively and compared. 3Based on experimental analysis, the relation among the speed ratio changing rate, oil pressure of driving and driven pulley cylinders, driving pulley input speed and torque, metal belt speed ratio has been studied. Model for getting the ratio changing rate is put forward, and practical equation giving the ratio changing rate is obtained by experiments.

对装有CVT和装有MT的羚羊轿车的经济性和动力性进行了计算和比较分析。3）通过实验分析，研究了主、从动轮油缸压力、主动轮转速、输入转矩和带式无级变速传动速比与速比变化率的关系，建立了获取CVT速比变化率的模型，导出了符合实际规律的实用计算公式。4）应用键合图理论，建立了金属带式无级变速汽车传动系的键合图模型，推导了系统的状态方程。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。