阻环

Main component of composition of the negative type photoresistive agent is polyimide, which possesses pendent -COOH. Reaction between partial carboxylic acid group and monomer with glycidyl acrylate generates bond junction. Rudimental other part of carboxylic acid group and additional additive component with third amino group and monomer of C=C double bond forms ionic bond junction.

本发明的负型光阻剂组合物的一主要成份为聚亚酰胺其具有悬垂的-COOH且部分的羧酸基与带有环氧基团的丙烯酸酯单体glycidyl(methacrylate反应形成键结，而残留的另一部分羧酸基与另外添加的成份带有第三胺基及C＝C双键的单体形成离子键结。

Similarly, the acyl-oxygen cleavage of MG mainly occurs at theleast hindered carbonyl group and alternating D,L-PLGA50 wasobtained.

同样，MG单体的开环主要发生在位阻较小的羰基一侧〓，合成了窄分子量分布的聚乳酸-交替-聚乙醇酸共聚物。

The control of the lead angle of the motor is studied. The power MOSFETs are used as a power amplifier which adopts a half-bridge circuit.

本文设计了变磁阻电机三相绕组的电流闭环控制系统，并研究了超前角控制问题。

The optimum reaction conditions are obtained by orthogonal exptl. design; ring-opening reaction:n:n = 1:1.3, Hexamethylenetetramine catalyst 0.7%,reaction temp. is 80℃, reaction time is 7 h, and concentration of inhibitor is 0.3%. ring-closing reaction : n:n=1:0.9, reaction temp. is 40℃, reaction time is 5 h.

通过正交设计确定了最佳工艺条件为：开环反应：六次甲基四胺用量0.7%(占反应物总量的质量百分比)，阻聚剂用量0.3%(占反应物总量的质量百分比)，ECH：MAA的摩尔比为1.3：1，温度80℃，反应时间7h ；闭环反应：氯醇酯： NaOH的摩尔比为1：0.9，反应温度40℃，反应时间5h。

Experimental results show that the different substituted location and different substituted group on benzene cycle would result in the diversity of reduction properties of substituted aryl nitrobenzene. Substituted nitrobenzenes with withdrawing group will be reduced at more positive potential, while those with repelling group will be reduced at more negative potential. In addition, the reduction potential of nitro group of o-nitrobenzene shifts more negative due to the effect of space resistance.

结果表明，芳族硝基化合物在苯环上的取代基位置不同以及在相同位置上取代基的种类不同均可使各芳族硝基化合物的电还原性能发生较大差异：吸电子取代基在电还原过程中电位较正，推电子取代基的电还原电位较负：邻位取代基在反应过程中由于空间位阻效应，苯环上的硝基在电还原时电位往负方向移动。

The epoxidised cashew nut shell oil acrylate oligomer for UV curing materials was synthe- sized using epoxidised cashew nut shell oil and acrylic acid as main raw materials,N,N-dimethyl- benzylamine as catalyst and p-hydroxyanisole as inhibitor.

以N，N-二甲基苄胺作催化剂、对羟基苯甲醚作阻聚剂，环氧化腰果壳油和丙烯酸为主要原料合成了一种新型的紫外光固化预聚物——环氧化腰果壳油丙烯酸酯。

The molecular structure was clarified by IR, which revealed the existence of ether bonds. The content of tartaric acid and unreacted maleic acid were detected by spectrophotometer. The effect of some factors on the yield of ESA and scale inhibition efficiency of PESA was investigated.

利用红外光谱表征了该产物结构，表明分子链中含有醚键；利用紫外－可见分光光度法测得体系内副产物酒石酸和未反应的马来酸的含量，并系统地研究了各因素对中间产物环氧琥珀酸钠的产率和最终产物聚环氧琥珀酸钠阻垢性能的影响。

To explore new synthetic methods, we set out a careful investigation of the reaction of benzimidazolium salt with many nucleophilic agents, including the active aromatic compounds and heteratom nucleophilic agents, and found that the quaternary C=N is not so active; when benzimidazolium salt is reacted with big nitrogen nucleophilic agent? phthalimide, it does not give the expected addition product, instead, produces N-alkyl phthalimide through alkyl-transfermation from benzimidazolium salt to phthalimide.

为了开发新的合成方法，研究了苯并咪唑盐与各种亲核试剂（活泼芳环与杂原子亲核试剂）的反应，发现苯并咪唑盐不与活泼芳环及杂原子亲核试剂发生2位加成反应；在与体积较大的位阻型N亲核试剂邻苯二甲酚亚胺反应时，未得到亲核试剂与极化的C＝N的加成产物，而是得到N烷基化的邻苯二甲酰亚胺，进一步研究表明，苯并咪唑盐将1（3）位N上的烷基转移给了邻苯二甲酰亚胺，并讨论了其反应机理和取代基，溶剂效应。

A highly effective and efficient phosphorus-free, nitrogen-free and biodegradable sequestering agents and detergency builders Polyepoxysuccinic acid was synthesized through negative ion synthesis.

以顺丁烯二酸酐为原料，通过环氧化反应和阴离子聚合的方法，合成了一种无磷、非氮、生物降解性好的环保型阻垢剂聚环氧琥珀酸。

By means of the plating technology and the system designed and made ourselves, we call them as the direct-heat evaporating roll-pulled with vacuum piston and the helix evaporating of straight heat-wire with the negative thermal specific resistance , the align polishing ring films and the separating ones of pure gold have been plated directly at the inner wall of the capillary of Sealed-off CO〓 laser.

简便有效地使器件的输出功率、光束品质、稳定性和使用寿命都得以提高的作用效果；分析了放电驱动催化机理及催化效果与器件参数、工作状态及其中的等离子体过程的对应关系，建立了数学模型，编程数值计算了放电管内正柱区中等离子体参数分布及其与器件工作外参数的关系；利用我们设计开发的直热式真空活塞卷拖和负阻直热丝螺旋蒸镀工艺及制作的系统，在封离型CO〓激光器毛细管玻璃内壁上直接镀制出了单质金的镜面环膜和离散膜，经理论分析和实验检验，指出美国专利4756000号的环金方案将导致器件工作特性的改变和恶化，降低效率；肯定了正柱区边界部分场对建立良好的激光振荡的作用意义，明确提出了①作为高品质器件设计基础的弥散膜催化剂；②高斯管型弦驻波振动定型磨制、检测的新概念及相应的制备加工工艺；实际制出了管子，测定了其基本的工作特性和初期过程。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。