查询词典 powerful current

Since Al〓Ga〓In〓P possesses larger valence band difference to GaAs and wider energy gap, minor carrier reverse injection from base and space charge region recombination in the emitter are effectively suppressed in Al〓Ga〓 In〓P/GaAs HBT. Under most circumstances, quasi-neutral base recombination current dominates the base current, and its ratio to collector current varies little with collector current and temperature, thus greatly stabilizes the current gain.

Al〓Ga〓〓In〓P/GaAs HBT由于异质结的△Ev较大，发射区禁带较宽，有力地抑制了基区少子反向注入流和发射区空间电荷区复合电流；在大多数情况下，基极电流以准中性基区复合电流为主，其与集电极电流的比值随集电极电流和温度的变化极小，稳定了电流增益。

The relationships between welding pool width, wire extension and welding parameters including welding current duty ratio, base current, peak current, welding speed and wire-feeding speed were studied. Through large numbers of welding experiments, aluminum alloy pulsed MIG welding dynamic process were identified by the curve fitting method, and the mathematical models between welding current duty ratio, base current, welding speed, wire-feeding speed and wire extension were obtained, succeeding the model between the above parameters and weld pool width.

介绍了铝合金MIG焊焊接电流占空比、基值电流、峰值电流、焊接速度、送丝速度对熔宽的影响规律，并在其基础上，通过平板堆焊试验研究了这些参数对焊接干伸长的影响规律；在铝合金机器人脉冲MIG焊平板堆焊过程各焊接参数与正面熔宽之间的传递函数的基础上，采用铝合金平板堆焊阶跃试验，利用曲线拟合法辨识了铝合金机器人脉冲MIG焊动态过程传递函数，建立了焊接电流占空比、基值电流、焊接速度、送丝速度与焊接干伸长之间的对象数学模型。

When the system starts, the speed outer ring saturats non-functional, the current inner ring plays a major role to regulate the starting current to maintain the maximum so that the speed linear change, to reach a given value; when it operates steadily, the speed negative feedback from the outer ring plays a major role ,to let the speed changes with the given speed voltage , at the same time the current inner ring regulates the armature current of motor adjustment to balance the load current.

该系统起动时，转速外环饱和不起作用，电流内环起主要作用，调节起动电流保持最大值，使转速线性变化，迅速达到给定值；稳态运行时，转速负反馈外环起主要作用，使转速随转速给定电压的变化而变化，电流内环跟随转速外环调节电机的电枢电流以平衡负载电流。

The main research work of this dissertation is as follows: Based on the chemical reaction engineering theory and the nitrobenzene electroreduction mechanism, the plate and frame electrolyzer was designed and applied to the process of electroreduction nitrobenzene to p-aminophenol. This dissertation measured the residence time distribution data of the electrolyzer by means of the pulse response method and studied the rule of flow pattern along with the current capacity change. Under different conditions ,this dissertation studied the cyclic voltammetry properties of nitrobenzene on different electrodes by means of the dynamic cyclic voltammetry method and the electrode materials applied to the NB electroreduction have been selected primarily.Baseed on the results of cyclic voltammetry tests, this dissertation used p-electrode systems to measure the steady-state- polarization curves of nitrobenzene on different electrodes in H-type diaphragm cell, and obtained each primary factor s influence rule and the exchange current density value of each electrode.And then on the basis of the conclusions of fundamental researchs upword, the effects of influence factors on the the yield of p-aminophenol and the current efficiency,such as electrode material, current density, quantity of electricity circulated, nitrobenzene concentration . sulpuric acid concentration and so on, have been studied in detail in the systems of hign temperature , strong acidity and oxygen-poorthrough a series of electrolysis experiments in this paper.After all using Pb as anode Monel metal as cathode Dupont Nafion 417 cation-exchange membrane as membrane, this dissertation obtained the optimum technological condition: reaction temperature about 85C, current density 500A m-2, sulphuric acid concentration 20%wt.

论文的主要研究工作为：运用化学反应工程理论，结合硝基苯的电还原机理，设计出用于硝基苯直接电还原合成对氨基苯酚实验的板框式电解槽，并利用脉冲响应法测定了该板框式电解槽的停留时间分布数据，研究了流型随流量变化的规律；通过动态循环伏安法研究了硝基苯在不同电极上、不同条件下的循环伏安特性，初步评选出了用于硝基苯电还原的电极材料；结合循环伏安的测定结果，在H型隔膜电解槽中采用三电极体系测定了硝基苯在不同电极上、不同条件下的稳态极化曲线，得到了各主要因素的影响规律及硝基苯在各个电极上电还原的交换电流密度数值；在基础研究结论指导下，采用板框式电解槽，在高温、强酸、贫氧系统中，进行了一系列的电解实验，分别考察了电极材料、电流密度、通电量、硝基苯浓度、硫酸浓度等因素对收率及电流效率的影响，最终选择以蒙乃尔合金电极作为阴极、铅合金为阳极、Dupont Nofion 417阳离子交换膜为隔膜，得到由硝基苯直接电还原制对氨基苯酚的最佳电解工艺条件：反应温度85℃，电流密度500A·m~(-2)，硫酸浓度20％wt。

The anode structure of CI-LIGBT is optimized by numerical simulation, and it is pointed out that segmented p〓 anode region surrounded by n〓 anode region is the key to improve the ability of current limiting, and the more deeper the n〓 anode junction relative to the p〓 anode junction, the more powerful the ability of current limiting is. The affection of the breakdown voltage BV〓 of the reverse biased p〓n〓 junction and the sample resistance upon the latching current, the latching voltage and the on-state voltage have been studied, and it is indicated that the tradeoff between the on-state voltage and the latching characteristics is the excellentest when BV〓 is 1. 1V so that its on-state voltage can be just only 0.6V higher than conventional LIGBT. It is also found that this device is especially suit to high temperature environment. Based on X. B. Chen's surface voltage sustaining structure using optimized variational lateral doping and Ludikhuize's multiple floating rings structure, high voltage LIGBT and is studied in this paper.

通过数值模拟，优化了CI-LIGBT的阳极区结构，指出采用被n〓阳极区包围的单元状p〓阳极区是提高该器件限流能力的关键，而n〓阳极区结深相对p〓阳极区结深越大，器件的限流能力越强；分析了反偏p〓n〓结击穿电压BV〓和取样电阻对器件闩锁电压、闩锁电流和导通压降的影响，得出BV〓在1.1V时器件导通压降和抗闩锁能力间的折衷关系最优，其导通压降仅比普通LIGBT高0.6V；分析了温度对LIGBT闩锁性能的影响，表明CI-LIGBT即使在450K的高温下也不会闩锁，尤其适用于高温工作环境。

We will have not only a powerful army, but also a powerful air force and a powerful navy.

我们将不但有一支强大的陆军，而且有一支强大的空军和一支强大的海军。

By analyzing the evaluation results above, it is concluded that the comprehensive competitiveness of suburban districts are presented dividedly: Minhang, Songjiang, Baoshan and Jiading constitute the most powerful group; Qingpu and Fengxian belong to the second powerful group; Nanhui, Jinshan and Chongming form the least powerful group.

通过分析两项竞争力的评价结果发现，上海郊区县综合竞争力呈现分化的状态：闵行、松江、宝山和嘉定构成了竞争力较强的第一集团，青浦和奉贤属于实力中等的第二集团，而南汇、金山和崇明形成了竞争力较弱的第三集团。

In a word, powerful clan in West and East Han dynasties built and kept clan power, completed step by step the transition from civil society to clan society through the development of powerful clan, especially the patriarchalism of powerful clan, thus forming the foundation of Shi Zu society of Wei and Jindynasties.

第三章 豪族的宗族化进程与汉代社会结构的演变两汉是宗族势力的复苏和重建，在一定程度上取决于豪族势力通过政治联结，逐步控制汉代政治的运行，出现&累世公卿&的名门望族，即豪族的官僚和宗族化来实现的。

To obtain frequency is mixed take the intermittent breath with sky adjustable comparing, put forward a kind to be based on gas to accuse reversal valve switch from oscillation loop, accuse throttle of series connection of mouth of forerunner of a powerful person through be being enraged, tone sheds a powerful person to leave successively degree, and control aerates to forerunner mouth time, control gas to charge the reversal time of a powerful person then, produce different frequency and the intermittent breath that take sky comparing.

为获得频率和占空比可调的间歇气流，提出了一种基于气控换向阀切换的自振荡回路，通过在气控阀先导口串联节流阀，调节节流阀开度，而控制向先导口充气时间，进而控制气控阀的换向时间，产生不同频率和占空比的间歇气流。

The gun was a good time, after sitting a little bigger, a powerful and easy operation, suitable for all kinds of maps environment M16:The gun power, after sitting a little high, and be convenient operation, but more is still poor and m4a1 some ; AK-47:The gun after sitting too large, the most powerful, it is difficult to operate, but to all kinds of maps of the environment is a very good of the gun ; AK－74:Power of the gun, fire is quickly, then take a great improvement of the 74 than 47 more easy to operate FAMAS:The power of a gun, fire, take off after a person closer to the king G36K:The power of a gun, fire is quickly, then sat a small operation is very easy overhand SG552:The gun power, and sat down and large, but the fire, is a good fast screen, sniper rifles AUG:The gun power, after sitting a little fire, and is sure of the higher is the world famous one of the sniper rifle ; AWM:The gun after a powerful, by too big, fast and slow to be very high, who is a widespread use of the sniper rifle ; M700:The gun power larger and smaller, a relatively rapid speed and must have very high, use less M60:The gun power, and sat down and large, the fire, is not high, is a suppressed fire MP5:The gun after power, by a fire made, and must have a high, is a very good lead to a submachine gun ; MP7:The gun after power, and sat down, fire is quickly, he is too poor to cooperate with the team to use

此枪精准高，后坐较小，威力较大，容易操作，适合各种地图环境使用； M16：此枪威力较大，后坐较小，精准较高，方便操作，但是和M4A1比较还是差了点； AK-47：此枪后坐太大，威力更大，难以操作，但是适应各种地图环境是一把十分不错的高杀伤力枪； AK－74：此枪威力较大，射速较快，后坐比较大，改进后的74比47更容易操作； FAMAS：此枪威力较小，射速飞快，后坐较大，人称近距离步枪之王； G36K：此枪威力较小，射速较快，后坐很小，操作非常方便容易上手； SG552：此枪威力较大，后坐也大，但是射速很，是一把不错的快掩护型狙击步枪； AUG：此枪威力较大，后坐较小，射速一般，精准较高，是世界有名的狙击步枪之一； AWM：此枪威力巨大，后坐太大，射速较慢，精准很高，谁一把广泛使用的狙击步枪； M700：此枪威力较大，后作较小，射速较快，精准很高，一般使用人少； M60：此枪威力较大，后坐也大，射速一般，精准不高，是一把压制火力的重机枪 MP5：此枪威力一般，后坐较小，射速飞快，精准较高，是一把非常不错的冲锋与反冲锋枪； MP7：此枪威力一般，后坐较大，射速极快，精准太差，主要适合团队配合才可以使用

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了