简介:Theoperationprincipleofanarrayedwaveguidegrating(AWG)multiplexerisintroducedandthe4×4AWGwithfollowingdesignparametersisdiscussedindetail,suchasthechoiceofwavelength,theneighboringarrayedwaveguidedistanceΔL,thechannelfrequencyintervalΔf,andthefreespectralrange.Thestructureof4×4AWGisdesignedandtheresultofstimulatedtestisalsogiven.Analysisshowsthatthe4×4AWGischaracterizedbyawidedynamicrange,lowcrosstalk,betterspectrumproperties,andacompactstructure.
简介:Thetitlecompounds4,4'-oxobis(propham)((?)n)(C20H24N2O5,Mr.=372.41)wassynthesizedbytheadditionreactionofcorresponding4,4'-oxobisphenyldiisocyanatewithisopropanol.ThecrystalstructurewasdeterminedbyX-raydiffractionmethod.Thecrystalistriclinicsystem,spacegroupP-1witha=8.5107(17),b=9.1164(18),c=14.5701(3)A,α=80.44(3),β=85.25(3),γ=62.88(3)°,V=992.2(3)A3,Z=2,Dc=1.247g/cm3,F(000)=396,R=0.0520,wR2=0.1434for4336observedreflectionswith[I>2σ(I)].X-rayana...
简介:摘要:目的:研究急性心力衰竭的重症护理干预措施及效果分析;方法:本次研究选取2020年5月至2021年5月于我院治疗急性心力衰竭的66例患者作为本次研究对象,并选用抽样法将其分为对照组与研究组,每组各33例,对照组应用常规护理方式,研究组以常规护理为基础进行重症护理干预措施,在护理完成后对两组患者的生活质量评分、护理满意度进行对比。结果:研究组生活质量评分显著高于对照组,且再入院率低于对照组。同时研究组服药依从性及满意度显著优于对照组,差异较大,存在统计学意义(P<0.05)。结论:将重症护理应用至急性心力衰竭患者治疗中可有效提升抢救成功率,提高患者生活质量,值得在临床中推广应用。
简介:ThemoleculartransformationsofcarboxylicacidsinheavyacidicSLcrudebeforeandaftertrueboilingpointdistillationwereexaminedbyultra-highresolutionnegative-ionelectrosprayionization(ESI)Fouriertransformioncyclotronresonancemassspectrometry(FT-ICRMS).Theacidclass(heteroatomnumber),type(znumbers)andcarbonnumberdistributionswerepositivelycharacterized.Itwasfoundoutthatthetotalacidnumber(TAN)ofSLcrudedecreasedaftertrueboilingpointdistillation,andtheabundanceofO2classinmassspectrawasalsofoundtobereducedfrom67.6%to34.5%inSLTBPmixedcrudeasmeasuredbyMSspectra,indicatingtoapotentialcarboxylicaciddecomposition.However,itwasinterestingthatthecarboxylicacidstypedistributioninbothoilswasalmostthesamealthoughtheirrelativeabundanceinSLTBPmixedcrudeturnedtobemuchlower,suggestingthatvariouspetroleumcarboxylicacidtypeshavethesimilarthermaldecompositionreactionbehavior.Furthermore,foreachO2typeofacidsinSLTBPmixedcrude,theabundanceofcarboxylicacidswithcarbonnumberhigherthan35wasreducedgreatly,especiallyforthosewithcarbonnumberhigherthan60,themasspeaksofwhichwerenearlytotallyremoved,indicatingthatthelargecarboxylicacidmoleculesinheavyfractionsdecomposedmoresignificantlybecauseoflongerheatingtimeduringthetrueboilingpointdistillationprocess.Asaresult,thereductionofTANmaybecausedbythethermaldecompositionofcarboxylicacidsespeciallythosewithhighcarbonnumber,suggestingthatquickdistillationormuchlowerpressureisrequiredtoavoidthethermaldecomposition.
简介:一些资料上要求学生解这样一类方程"32÷4x=4".学生中往往出现两种解法,第一种是把原方程看成"32÷(4×x)=4"去解,得x=2;第二种则是将原方程看作"(32÷4)×x=4"去解,得x=0.5.教师要求学生检验方程的解.采用第一种解法的学生,先把4与x的值相乘,得如下检验式:
简介:标致Rifter4x4概念车是为了探索更大空间而设计,任何地形上的探险它都可以游刃有余。它采用全轮驱动、特制轮胎,离地间隙比常规版标致Rifter高出80毫米。在车顶上配备了Overland帐篷,即便日落西山依然可以继续行路。另外,车上还配备了标致全新的电动山地自行车eM02FSPowertube。这款车充分利用了撞色和材料的拼接,风格现代而又独特,功能多样而又高效。标致Rifter4x4概念车的车身主色是一种特制的闪光灰,在进气格栅和发动机盖之间、尾门上采用了