简介:目的:此研究是为了寻找在运动强度范围内,V^·O2与跑速的关系。在乳酸阈(Tlac)之上恒定负荷的自行车运动中,V^·O2在3分钟内还未达到稳定状态,而是持续升高,延迟出现一个较高的稳定状态或力竭。由于运动耗氩量的大部分(V^·O2慢成分)仅被证明在Tlac之上的一定运动强度出现,设想在渐增负荷测试中各阶段持续足够长的时间,V^·O2慢成分将与Tlac同时出现。方法:5名男子做为受试者(平均值±SD,年龄31±2岁,V^·O2peak60.1±5.8ml·kg^-1·min^-1)在8天内进行4次相同的跑台测试.包括完成各持续2分钟的6个阶段,跑速逐级增加0.5km·h^-1,在第一次测试的每个阶段未采手指末梢血以确定Tlac在所有测试中,呼吸气体用Douglas袋采集.分别在每个阶段的3.0~3.75分和6.0~6,75分采集以确定在各阶段中V^·O2的增加(△V^·O2)。结果:每名受试者四次测试各阶段V^·O2平均值被确定出来,方差分析发现△V^·O2有明显增加是在Tlac跑速之上,而不是其下。结论:此研究结果证实,V^·O2慢成分和酸中毒的发生有紧密联系,并证明了在渐增负荷跑台运动中,Tlac之上的强度时,V^·O2与运动强度呈线性关系。
简介:Themajoraimscombustionengineersallovertheworldarestrivingatareconservationofenergyandallevia-tionofenvironmentalpollution,forwhichthemonitoringandcontrolofthefurnaceprocessareofprimeimportancetoattainanoptimizedconditionofcombustion.Oxygencontentinfluegasisgenerallyusedasanindicatorofwhethertherightamountofcombustionairissupplied.However,itcannotdirectlyreflectthedegreeofperfectionofthecombustionprocesstakingplaceinthefurnace.OntheotherhandCOisaproductofchemicalreactionwhichdirectlyreflectsthe
简介:石墨和ZrB2–SiC的氧化行为修改了石墨合成在1×105Pa空气和0.2×105PaO2。氧化测试在一个感应的加热炉子被进行。这二材料的氧化跟随了线性率法律。在2100°C的石墨和C–ZrB2–SiC的坚定的半径损失率在1×105−2和1.05×10−2%/s>Pa空气,和3.23×10−2和2.21×10在0.2×105−2%/s>PaO2,分别地。ZrB2并且原文如此的加入显著地减少了石墨的氧化率因为在氧化期间在样品表面上形成的氧化物规模在减少暴露的表面区域帮助在下面底层。在有一样的氧的二不同气氛部分压力,石墨和C–ZrB2–SiC在0.2×105PaO2比在1×105Pa空气。氧化为石墨和C–ZrB2–SiC的控制率的步被建议分别地是通过边界层并且通过在氧化物规模的毛孔的氧的里面的散开。一个模型基于散开理论被建立在他们的氧化行为上讨论全部的煤气的压力的效果。
简介:Aquantumdynamiccalculationonafive-dimensionalO2/LiF(001)modelsystemisperformedusingthemulti-configurationtime-dependentHartreemethod.Theobtainedresultsshowthatthemechanismofrotationalanddiffractiveexcitationindetails:Comparisonwiththerotationalexcitedstate,theinitiallynon-rotationalstateisseentofavortheinelasticscatteringintherotationalexcitationprocess.Thesurfacecorrugationcandampthequantuminterferencesandproduceagreateramountofrotationalinelasticscatteringattheexpenseoftheelasticprocessintherotationalexcitationprocess.Thediffractionprocessandtheaverageenergytransferredintotherotationalanddiffractivemodearealsodiscussed.
简介:NOVELOXIDATIONOFHEXABENZYLHEXAAZA-ISOWURTZITANEBYMe2CHNO2/CuCl/Py/O2XiaoPeiGUAN;HongYAN;JianGuangSUN;YongZhongYU(ScholofChe?..
简介:TheeffectofthecoadsorptionofCOandO2ontheZiff-Gulari-BarshadsurfacecatalyticreactionsysteminstudiedbyMonteCarlosimulation.ThecoadsorptionofbothspeciesaddsanextrareactionsteptotheclassicalZiff-Gulari-Barshadmodel.Itisshownthatthesecond-orderphasetransitionfromthereactivestatetotheO-passivatedstateintheZiff-Gulari-Barshadmodeliseliminated,andtheproductionrateofCO2increaseslinearlyalongthefractionycoofCOingasphasewhenitislow,inagreementwithexperimentalresults.WealsofindthattheincreaseoftheprobabilityofthecoadsorptionleadstothedecreaseofthecriticalvalueofycoofthediscontinuousphasetransitiontotheCO-passivatedstate.
简介:Asasuccessiveworkofourpreviouspaper,^1theelectrontransfermatrixelement(Vrp)intheoxidationofthesimplifiedmodelmoleculeofα-aminocarbon-centeredradicalbyO2hasbeeninvestigatedwithabinitiocalculationatthelevelofUHF/6-31G**.Basedontheoptimizedgeometriesofthereactgantandtheion-paircomplexobtainedpreviously,thereactionheatandtheiunerreorganizationenergyhavebeenobtainedbyconstructingthepotentialenergycurvesofreactantandproductstatesconsideringthesolventeffectwiththeconductor-likescreeningmodel(COSMO).ThesolventreorganizationenergyhasbeenestimatedusingLippert-Matagarelationship.ThecalculatedresultsshowthatthevalueofVrpisseveraltimeslargerthanthatofRT,whichmeansthatthemodelreactionisanadiabaticone.Theoreticalinvestigationindicatesthatthesolventeffectonthedirectelectrontransfer(ET)processofoxidationofα-aminocarbon-centeredradicalbyoxygenisremarkable.
简介:StudyonMorphologyofSurfaceofLargeAreaYBCOThinFilmsonZr(Y)O2SubstrateWangRuikun(王瑞坤),SunLihong(孙丽虹),LiuHongfei(刘鸿飞)WangXiaopi?..