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脉冲复合的
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  pulse multiplication
     The physical mechanism of pulse multiplication in ring cavity during rational harmonic mode locking process has also been theoretically analyzed in detail.
     从理论上对有理数谐波锁模过程中腔内脉冲复合的物理机制进行了详细分析。
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  相似匹配句对
     Pulse Nickl-plating
     脉冲镀镍
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     PULSED MHD GENERATOR
     脉冲磁流体发电机
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     Multiple White
     复合的白色
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     The physical mechanism of pulse multiplication in ring cavity during rational harmonic mode locking process has also been theoretically analyzed in detail.
     从理论上对有理数谐波锁模过程中腔内脉冲复合的物理机制进行了详细分析。
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  pulse multiplication
A Novel Scheme for Optical Pulse Multiplication Using Fiber Coupler Loop-connecting Configuration
      
A novel scheme for optical pulse multiplication using fiber coupler loop-connecting configuration
      


It is well known that the key problems to realize HCCI combustion in a DI diesel engine are firstly formation of premixed diesel/air mixture and secondly control of ignition and thirdly control of combustion.This paper presents a new HCCI combustion technology,which is based on an injection rate flexibly controlled common rail injector system and a socalled BUMP combustion chamber.By means of the common rail fuel injection system,the pulse number,injection period and the dwell time between injection pulses...

It is well known that the key problems to realize HCCI combustion in a DI diesel engine are firstly formation of premixed diesel/air mixture and secondly control of ignition and thirdly control of combustion.This paper presents a new HCCI combustion technology,which is based on an injection rate flexibly controlled common rail injector system and a socalled BUMP combustion chamber.By means of the common rail fuel injection system,the pulse number,injection period and the dwell time between injection pulses can be accurately controlled.The principle of the control is to limit the penetration of the pulse spray so that the fuel can not touch the cylinder liner,to enhance the mixing rate of each of fuel packages and also to control the ignition and the heat release rate,which should be favorable to thermal effciency and emissions.Another technology developed by the authors is socalled BUMP combustion chamber.The fuel of the last pulse injection or the main injection can only mix with air at a very short time period,because of very short ignition delay due to higher temperature and higher pressure near TDC.The BUMP combustion chamber was developed from the findings of a previous fundamental studyIt is observed that BUMP chamber disperses the fuel of last injection into the condition of "Lean diffusion combustion" immediately.Combining both technologies of compound control of multipulse fuel injection and the BUMP combustion chamber,a new HCCI combustion in a DI diesel engine is realized.

为了实现柴油机NOx和碳烟超低排放的目标,提出了基于电控高压共轨燃油系统的多脉冲复合控制均质压燃(简称HCCI)燃烧系统。该系统应用电控共轨燃油系统对燃油喷射规律实现多脉冲灵活控制,通过提前角大于上止点前90°的多次脉冲喷射,成功控制了预混合气的形成、着火和燃烧过程。从小负荷直到平均有效压力高达0.79MPa的大负荷,均成功实现了以预混压燃燃烧为主要特征的燃烧过程,使柴油机的烟度始终能够控制在0.5BSU以下,HC排放小于40×10-6,而NOx大幅度降低至240×10-6。

Research and development trends of electrodeposited multifunctional composite materials are reviewed at home and abroad, including polybasic composite electrodeposition, pulse composite electrodeposition,pulse jet electrodeposition,electrodeposition of nano\|powders and functional gradient materials. Results show that wear resistance, corrosion resistance and anti\|high temperature oxidation of these kinds of composite coatings are much better than those of tranditional single metal coatings,alloy coatings...

Research and development trends of electrodeposited multifunctional composite materials are reviewed at home and abroad, including polybasic composite electrodeposition, pulse composite electrodeposition,pulse jet electrodeposition,electrodeposition of nano\|powders and functional gradient materials. Results show that wear resistance, corrosion resistance and anti\|high temperature oxidation of these kinds of composite coatings are much better than those of tranditional single metal coatings,alloy coatings and their composite coatings. They will have wide application prospects in the future.

综述了近年来国内外在复合电沉积制备多功能复合材料方面的研究动态与发展趋势 ;重点探讨了多元复合电沉积、多元脉冲复合电沉积、脉冲喷射电沉积、纳米复合电沉积以及功能梯度材料的复合电沉积等方面的研究现状和发展趋势。结果表明 :这五类复合材料镀层的性能比传统的单金属镀层、合金镀层及其复合镀层更加优异 ,在今后的发展中将有更广阔的应用前景

The hardness, wear rate, phase structure and morphologies of DC, and pulse composite coatings such as Ni-W-B-SiC, RE-Ni-W-B-SiC, RE-Ni-W-B-SiC-MoS 2 and RE-Ni-W-B-SiC-PTFE are studied. The results show that the hardness of pulse composite coatings is higher than that of DC composite coatings, but the hardness of RE-Ni-W-P-SiC-PTFE composite coatings is lower. The hardness of the four kinds of composite coatings increases with the rise of heat treatment temperature and reaches the highest value at 400℃, thereafter,...

The hardness, wear rate, phase structure and morphologies of DC, and pulse composite coatings such as Ni-W-B-SiC, RE-Ni-W-B-SiC, RE-Ni-W-B-SiC-MoS 2 and RE-Ni-W-B-SiC-PTFE are studied. The results show that the hardness of pulse composite coatings is higher than that of DC composite coatings, but the hardness of RE-Ni-W-P-SiC-PTFE composite coatings is lower. The hardness of the four kinds of composite coatings increases with the rise of heat treatment temperature and reaches the highest value at 400℃, thereafter, the hardness begins to decrease. The hardness of RE-Ni-W-B-SiC composite coatings is the highest when the duty cycle is at 0.6 and 0.8 and pulse frequency is at 50Hz, and the hardness of RE-Ni-W-B-SiC composite coatings at r=0.8 is higher than that at=0.6; the wear rates of Ni-W-P-SiC, RE-Ni-W-P-SiC and RE-Ni-W-P-SiC-PTFE pulse composite coatings are lower than those of DC composite coatings and the wear rates of RE-Ni-W-P-SiC-MoS 2 and RE-Ni-W-P-SiC-PTFE pulse composite coatings are lowest; At-deposited, Ni-W-P-SiC and RE-Ni-W-P-SiC pulse composite coatings are amorphous and RE-Ni-W-P-SiC-MoS 2 pulse composite coating is mixed-amorphous, but RE-Ni-W-P-SiC-PTFE pulse composite coating has been turned into crystals; the crystalline grains size of pulse composite coating is smaller than that of DC composite coatings, rare earth deposited into the coating can make crystalline grains become fine, and all kinds of grains distribute equably in the coatings and there are not cracks on the surface and in the section.

主要研究了Ni-W -P -SiC ,RE -Ni-W -P -SiC ,RE -Ni-W -P -SiC -MoS2 ,RE -Ni-W -P -SiC -PTFE直流及脉冲复合镀层的硬度、磨损率、相结构及形貌 .结果表明 :脉冲镀层的硬度均高于直流镀层 ,但RE -Ni-W -P -SiC -PTFE复合镀层的硬度较低 .四种复合镀层的硬度随热处理温度的升高而增加 ,在 40 0℃时达到最大值 ,此后 ,热处理温度继续升高 ,复合镀层硬度反而下降 ;频率为 5 0Hz ,占空比为 0 .6和 0 .8时 ,RE -Ni -W -P -SiC镀层的硬度最高 .占空比为 0 .8时的镀层 ,其硬度均高于占空比为 0 .6的镀层 ;Ni-W -P -SiC ,RE -Ni -W -P -SiC ,RE -Ni -W-P -SiC -PTFE脉冲镀层的磨损率明显低于直流镀层 ,且RE -Ni-W -P -SiC -MoS2 和RE -Ni-W -P -SiC -PTFE脉冲镀层的磨损率最小 ;Ni-W -P -SiC ,RE -Ni-W -P -SiC脉冲镀层镀态下为非晶态结构 ,RE -Ni-W -P -SiC...

主要研究了Ni-W -P -SiC ,RE -Ni-W -P -SiC ,RE -Ni-W -P -SiC -MoS2 ,RE -Ni-W -P -SiC -PTFE直流及脉冲复合镀层的硬度、磨损率、相结构及形貌 .结果表明 :脉冲镀层的硬度均高于直流镀层 ,但RE -Ni-W -P -SiC -PTFE复合镀层的硬度较低 .四种复合镀层的硬度随热处理温度的升高而增加 ,在 40 0℃时达到最大值 ,此后 ,热处理温度继续升高 ,复合镀层硬度反而下降 ;频率为 5 0Hz ,占空比为 0 .6和 0 .8时 ,RE -Ni -W -P -SiC镀层的硬度最高 .占空比为 0 .8时的镀层 ,其硬度均高于占空比为 0 .6的镀层 ;Ni-W -P -SiC ,RE -Ni -W -P -SiC ,RE -Ni -W-P -SiC -PTFE脉冲镀层的磨损率明显低于直流镀层 ,且RE -Ni-W -P -SiC -MoS2 和RE -Ni-W -P -SiC -PTFE脉冲镀层的磨损率最小 ;Ni-W -P -SiC ,RE -Ni-W -P -SiC脉冲镀层镀态下为非晶态结构 ,RE -Ni-W -P -SiC -MoS2 脉冲镀层镀态下为混晶结构 ,而RE -Ni -W -P-SiC -PTFE脉冲复合镀镀态下为晶态结构 ;脉冲镀层的晶粒粒度要小于直流镀层 ,加入RE有细化晶粒的作用 ,各种微粒均匀分布在镀层中 ,镀层表面及断面没有裂纹

 
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