简介:Becausepulserepetitionrateaffecteddirectlythemomentumcouplingcoefficientoftransverselyexcitedatmospheric(TEA)CO2laserpropulsion,adoublepulsetrigger,controllinghighvoltageswitchoflaserexcitationcircuit,wasdesigned.Thepulseintervalrangedbetween5and100ms.Themomentumcouplingcoefficientforair-breathingmodelaserpropulsionwasstudiedexperimentally.Itwasfoundthatthemomentumcouplingcoefficientdecreasedwiththepulserepetitionrateincreasing.
简介:摘要:由于国标对精制柴油的产品质量中硫含量有了更高的要求,所以在2#柴油加氢装置工艺中增加了真空脱水塔,采取微负压控制,对柴油出装置前进行进一步脱水脱硫,但是在实际生产过程中,对于脱水塔的负压控制值有一定的变化,且对柴油长周期运行存在一定困扰,本文从机泵设备运行、脱水塔工艺操作及精制柴油的硫含量三个方面分析了对装置长期运行的影响,制定保证2#柴油加氢装置长周期运行措施,实现未来2#柴油加氢装置四年一检修的重要目标。
简介:WhenfemtosecondlaserpulsesinterferewithchirpedfemtosecondlaserpulsesinAs2S3fiber,achirpedfibergratingisformed.Ananalyticalexpressionisgiventodescribethechirpedgrating,anditsBraggreflectivityiscalculated.BecauseofthehighphotosensitiveeffectofAs2S3material,thechirpedfibergratinghasawideBraggreflectivespectrumandhighreflectivitybychoosingproperparameters.Thisindicatesthatthechirpedfibergratingcanbeusedasastretcherinthefemtosecondchirpedpulseamplification(CPA)system.