四代的

Chapter 4 gives an iterative maximum entropy rcgularization reconstruction method using the generalized Shannon entropy as the regularizer.

第四章中论述了使用广义Shannon熵作为正则化函数的迭代最大熵重建方法。

Only half of Nokia 6030- There are four signal input wires instead of two signal input wires in the second generation, which makes more brand cars available by easy connection without any teardown and adding any other parts.

只有一半诺基亚6030有四个输入信号而非电线电线两个信号输入的第二代这使更多品牌轿车方面没有任何可轻易拆卸、添加任何其他部分。

Four soluble poly(p-phenylene vinylene) derivatives with asymmetric alkoxyl substituents, poly (2-methoxy-5-butoxy)-p-phenylene vinylene, poly [2-methoxy-5-(3'-methyl)butoxy]-p-phenylene vinylene, poly (2-methoxy-5-hexyloxy)-p-phenylene vinylene and poly (2-methoxy-5-octoxy)-p-phenylene vinylene, were prepared by dehydrochlorination reaction with using p-hydroxyanisole and alkyl bromide as raw materials.

以对羟基苯甲醚和溴代烷烃为原料，采用强碱诱导的脱氯化氢缩合聚合法合成了四种可溶性不对称烷氧基取代聚对苯乙炔衍生物，分别为聚（2-甲氧基－5-丁氧基）对苯乙炔、聚［2-甲氧基－5-（3'-甲基）丁氧基］对苯乙炔、聚（2-甲氧基－5-己氧基）对苯乙炔和聚（2-甲氧基－5-辛氧基）对苯乙炔。

The AGM-88 is a second-generation air-to-ground antiradiation missile. The F-16 can currently carry two HARMs, though four-HARM loads are being flight-tested at Eglin AFB.

AGM-88是第二代空对地反辐射导弹。F-16一般情况下可以携带两枚HARM导弹，尽管在伊格林空军基地通过了携带四枚HARM导弹的外挂飞行测试。

The total synthesis of the title compound 10 was accomplished starting from 3,5-dimethoxybenzoic acid (1) and p-hydroxybenzaldehyde (6). In the process, esterification, reduction, bromination and Wittig-Homer reaction were performed.

以3，5-二甲氧基苯甲酸为起始原料，经过甲醇酯化、氢化铝锂还原、四溴化碳溴代和Wittig-Homer反应，高产率的合成了Wittig-Homer试剂(5)。

The target compound 1 was successfully prepared via esterification, reduction, bromization and cyanation processes by using L--malic acid (2), which is an inexpensive and easily available starting material. The overall yield was 56.7%.

以廉价、易得的L--苹果酸为起始原料，经酯化、还原、溴代和氰化四步反应得到目标化合物-4-氰基-3-羟基丁酸乙酯，合成总收率为56.7%。

A salt or ester of carbamic acid, especially one used as an insecticide.

丙烯酰胺、甲代烯丙基磺酸钠等为原料，采用溶液聚合法合成出兼含膦酰基和磺酸基的四元聚合阻垢剂PMAAS，。。。

According to the research of the paper, the "migmatite" of the Sizishan Formation, Xingdong Group distributed in northern Xiao Hinggan Mountains should be a suit of gneissic quartz monzonitegranite intrusions. Their whole rockmineral Rb-Sr isochronic dating is (482±19) Ma, indicating that an Caledonian magmatic events existed in the giant granitic belt of the Xiao Hinggan Mountains.

研究表明，分布于小兴安岭北部金林林场的兴东群四子山组&混合岩&为一套片麻状石英二长岩-花岗岩侵入体，岩石全岩-矿物Rb-Sr等时线年龄为(482±19) Ma，这表明小兴安岭巨型花岗岩带中存在早古生代岩浆事件。

The four menkind in three generations of He family.

老和的家庭三代四个男子。

Objective To investigate the degeneration of dopaminergic neurons induced by MPP+ in mouse mesencephalic dissociated culture and establish the cell model for parkinson'[KG-*3]s disease research in vitro.

目的： 探讨1-甲基-4-苯基-四氢吡啶离子对小鼠胚胎中脑原代培养多巴胺能神经元的毒性作用及其机制。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。