Wave is a very important problom in harbor engineeering.We must know the wave condition in the sea area before desingning the harbor structures,determining the overall arrangement and calculating the amount of deposit.

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A study on the way to increase efficiency of impulse turbine is presented.

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Expander replaced throttle valves is another attractive way to approach Carnot cycle and improve the efficiency of the system.

在此基礎(chǔ)上，對(duì)制冷熱泵采用近卡諾循環(huán)工質(zhì)后的效率及其它性能指標(biāo)(熱泵制熱溫度日韩99自拍视频在线观看免费播放、可靠性黄色短视频亚洲无码、機(jī)組尺寸、使用壽命等)進(jìn)行了計(jì)算和分析晚秋影院手机在线观看免费。

This paper, On the basis of defining the endo-irreversibility, discusses the basic favourable relation between efficiency and output power of irreversible Carnot cycle under two workings of cycle for case of QαΔ.

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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.

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