简介:运用文献资料法、实验法和数理统计法等,探讨水中等动力量训练对13~15岁100m蛙泳运动员专项力量、运动成绩的影响。结果表明:水中等动力量训练对提高100m蛙泳运动员专项力量素质和运动成绩具有更为优越的效果。
简介:为了核实赤峰1号井2014年初气汞异常现象,安装ATG-6138M测汞仪与原DFG-B测汞仪进行对比观测。ATG-6138M测汞仪观测到赤峰1号井房内空气汞浓度明显高于井孔内逸出汞浓度,表明观测井房可能存在汞污染问题。两台仪器同步观测井孔内逸出气汞浓度结果表明,ATG-6138M测汞仪测试结果稳定,动态清晰,而DFG-B测汞仪观测误差较大。对比DFG-B测汞仪与ATG-6138M测汞仪校准结果认为,DFG-B测汞仪已不能正常观测汞浓度的变化,存在捕汞管老化等仪器问题。综合分析表明,赤峰1号井DFG-B测汞仪存在环境汞污染和仪器老化等因素,且集气装置不符合地震行业标准技术要求,2014年初出现的气汞浓度异常信度不高,不能作为与地震孕育有关的前兆异常信息。
简介:摘要本文以京沪高速铁路5标DK1142+300处1跨128m下承式钢管混凝土系杆提篮拱桥为背景,介绍了钢管混凝土系杆提篮拱桥具体施工方法。
简介:Near-fieldstronggroundmotionsareusefulforengineeringseismologystudiesandseismicdesign,butdenseobservationnetworksofdamagingearthquakesarestillrare.Inthisstudy,basedonthestrong-motiondatafromtheMw6.6Lushanearthquake,thegroundmotionparametersindifferentspatialregionsaresystematicallyanalyzed,andthecontributionsfromdifferenteffects,likethehanging-walleffect,directivityeffect,andattenuationeffectareseparatedtotheextentpossible.DifferentengineeringparametersfromtheobservedgroundmotionsarecomparedwiththelocaldesignresponsespectraandanewattenuationrelationofWesternChina.Generalresultsindicatethatthehighfrequencygroundmotion,likethepeakgroundacceleration,ontwosidesofthefaultplaneissensitivetothehanging-walleffect,whereasthelowfrequencygroundmotion,likethelongperiodspectralacceleration,intherupturepropagationdirectionisaffectedbythedirectivityeffect.Moreover,althoughtheMw6.6Lushanearthquakeisnotalargemagnitudeevent,thespatialdifferenceofgroundmotionisstillobvious;thus,forathrustfaultingearthquake,inadditiontothehangingeffect,thedirectivityeffectshouldalsobeconsidered.
简介:为某人制作了非制冷探测器。探测器是基于as0.05sb0.95和as0.09sb0.91厚外延层生长在衬底上通过熔体外延(我)。GE浸没透镜在光导体。截止波长在as0.09sb0.91探测器明显延长至11.5μm,而且在as0.05sb0.95探测器是8.3μ室温,在6.8米和1μ200Hz调制频率波长DλP*峰值探测率为1.08×109厘米·典型/2·W-1为as0.09sb0.91光导型探测器,探测率D*在9μm波长为7.56×108厘米·典型/2·W-1,和11μm是3.92×108厘米·典型/2·W-1。在as0.09sb0.91探测器的探测率在波长长于9μM是一个数量比在as0.05sb0.95探测器高幅度的上升,砷(As)成分增加在as0.09sb0.91材料。
简介:Asimplifiedthree-dimension(3D)fadingchannelmodeldeployedinamulti-inputmulti-output(MIMO)beamformingsystemisexploredinthisarticle.Bothangleofarrival(AoA)andangleofdeparture(AoD)whichimpacttheoverallsystemperformanceareexamined.Thenumericalresultsaregivenforvalidatingtheaccuracyofthetheoreticalderivedformulas.Furthermore,theperformancesofthemodelwithdifferentnumberoftransmittersandreceiversarestudiedandcompared.TheincrementinAoAparametersdefinitelygeneratestheimpactofthesystemperformancewhentheconsiderationofsimplified3Dchannels.