简介：本文以某工程机械发动机用空气滤清器为研究对象，基于Abaqus模态分析提取空气滤清器各阶模态及模态参与系数，导入Fe-safe并结合空气滤清器实际工况功率谱密度PowerSpectralDensity（简称PSD）曲线，进行振动疲劳分析，并与振动疲劳试验台数据进行对比，仿真结果与试验结果具有一定的吻合度，证明了仿真方法的有效性。

简介：Safetyisveryimportanttoeveryone,especiallyteenagers.Asstudents,weshouldlearntokeepourselvessafeallthetime.Whatshouldwedo？Herearesomeadvices.First,weshouldkeepsafeathome.Ifwestayathomealone,weshouldn’topenthedoorforthestrangers,andwemustn’tplayfireathome,

简介：Asacontagiousbacterialinfectionthataffectstheconjunctivalcoveringoftheeye,thecorneaandtheeyelids,trachomaiscontrolledbyanendorsedintegratedstrategyconsistingofsurgeryfortrichiasis,antibiotictherapy,facialcleanlinessandenvironmentalimprovement,namely,theSAFEstrategydevelopedbyWorldHealthOrganization.Developedbasedonevidencefrompreviousfieldtrialsandconstantlymodifiedinpractice,SAFEstrategyhasgreatlyboostedtheprogressintrachomacontrol.Regardlessofthefactthattherearestillmanypendingquestions,nationalprogramcoordinatorsareconvincedthattrachomacontrolinitiativebasedonSAFEstrategywouldbeeffective.

简介：AsasignificantcomponentofChina’sefforttoresolveenergyproblems,nuclearpowerwillbekeptdevelopinginChina,andthesafetyofwhichcanbeensured.TheremarkscameatatimewhenuncertaintiesloomoverChina’snuclearfuture.Beijingsuspendedapprovalsfor

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简介：TheCprogramminglanguageisexpressiveandflexible,butnotsafe;asitsexpressivepowerandflexibilityareobtainedthroughunsafelanguagefeatures,andimproperuseofthesefeaturescanleadtoprogrambugswhosecausesarehardtoidentify.SinceCiswidelyused,anditisimpracticaltorewriteallexistingCprogramsinsafelanguages,sowaysmustbefoundtomakeCprogramssafe.ThispaperdealswiththeunsafefeaturesofCandpresentsasurveyonexistingsolutionstomakeCprogramssafe.Wehavestudiedbinary-levelinstrumentationtools,sourcecheckers,source-levelinstrumentationtoolsandsafedialectsofC,andpresentacomparisonofdifferentsolutions,summarizedthestrengthsandweaknessesofdifferentclassesofsolutions,andshowmeasuresthatcouldpossiblyimprovetheaccuracyoralleviatetheoverheadofexistingsolutions.

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简介：苏州科达科技股份有限公司全新推出了SAFE系列高清监控产品，涵盖高清NVR、高清网络摄像机、高清监控管理平台及相关辅助设备。其中，高清NVR凭借在管理中心发挥的关键作用而备受瞩目，加之通用行业与商业市场的高清系统更侧重于NVR＋网络摄像机这一高性价比组合方案，因此，在未来，高清越普及，NVR就越重要，并且两者会相互发生良性促进作用，推劝高清监控的进一步普及。

简介：SixteeninvertedsiphonsareinoperationattheBeijing-ShijiazhuangsectionintheMiddleRouteoftheSouth-to-NorthWaterDiversionProject.Theirsafeoperationiscloselyrelatedtothesafetyandthewaterdiversionefficiencyofthewholeprojectduringaniceperiod.Theiceaccumulationprocessattheinletoftheinvertedsiphonismodeledunderarealicecondition,andthenthehydraulicconditionsoftheicejampreventionareconfirmed.Accordingtotheexperimentalresultsandthedesignsizesoftheinvertedsiphons,thedetailedsafewaterdiversiondischargeandtheoperationalwaterlevelarestudied.Analysisresultsoftheseinvertedsiphonsprovidereferencesforthesafeoperationandthereasonableregulationsduringtheiceperiod.

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简介：TheformerNationalPopulationandFamilyPlanningCommissionimplementedtheUnitedNationsDevelopmentProgramme(UNDP)regionalproject'SafemobilityandHIVPreventioninnorthernChina'(theProject)in2005-2011.ThisarticlesummariestheachievementsoftheprojectandprovidesreferenceonHIVpreventioninterventiontargeting

简介：TheballmillingofFe-24MnandFe-24Mn-6Simixedpowdershasbeenperformedbythehighenergyballmillingtechnique.ByemployingX-raydiffractionandMoessbauermeasurements.Theccmpositionevolutionduringthemillingprocesshasbeeninvestigated.TheresultsindicatetheformationofparamagneticFe-MnorFe-Mn-Sialloyswithametastablefccphaseasfinalproducts.whichimplythattheFeandMnproceedaco-diffusionmeenanismthroughthesurfaceoffragmentedpowders.Thethermalstabilityandcompositionevolutionoftheas-milledalloyswerediscussedcomparingwiththebulkalloy,.

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简介：Helicopterinspectionofultrahighvoltage(UHV)transmissionlineshasunmatchedadvantagescomparedtomanualworkduetotheinspectionangleandhigh-techequipmentonboard,especiallyindetailedinspectionsoftowerheadsanddefect-detectionsinvirtueofinfrared/ultraviolettechniques.Thispaperdealswithsomekeytechnicalproblemsintheinspectionsof1000kVUHVAClineswithahelicopter,suchasthesafedistanceoflive-lineworking,electromagneticfieldintensityandflightcontrol.Basedonthestudyresults,asetofUHVlineinspectionmethodswasworkedoutandappliedtotheinspectionofliveUHVlines.

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简介：AIM:ToevaluatetheimpactofadvancedageonoutcomeMETHODS:Twohundredsandelevenpatientsundergonehepatectomy,gastrectomyandpancreatoduodenectomyfromJanuary1998toSeptember2002wereanalyzedretrospectively.Clinicopathologicfeaturesandoperativeoutcomeof83patientsaged65yearsormorewerecomparedwiththatin128youngerpatientsagedlessthan65years.RESULTS:Thenutritionalstate,suchaspre-operationlevelofserumalbuminandhemoglobinintheolderpatientswaspoorerthanthatintheyoungerpatients.Theolderpatientshadhighercomorbiditiesthantheyoungerpatients(48.2%vs15.6%).Nosignificantdifferencewasobservedinpedoperativemortality,andcomplicationratebetweentheolderandyoungerpatients(2.4%vs1.6%and22.9%vs20.3%,respectively).Multivariateanalysisdemonstratedthatpancreatoduodenectomy,hepatectomywithresectionofmorethan2segmentsandcomorbiditieswereindependentpredictorsofpostoperativecomplication,whereasagewasnot(P=0.3172).CONCLUSION:Itissafeforpatientsaged65yearsormoretoundergohepatic,pancreaticandgastricresectionifgreatcareistakenduringperioperativeperiod.

简介：FenanowirearraywithstrongshapeanisotropywasemployedasthesoftphaseinNd-Fe-Bbasednanocomposites.TheeffectsoftheFenanowiredistributiononmagneticpropertiesofthenanocompositeswereinvestigatedbymicromagneticsimulation.TheresultsindicatethattheshapeanisotropyofFewiresaddedinthesamedirectionastheuniaxialmagnetocrystallineanisotropyofthehardphasecannotincreasethecoercivityofthenanocomposite.Whenthenanowiresaredistributedperpendiculartotheeasyaxisofthehardphase,theshapeanisotropyofsoftphasecanretardthemomentsfromrotatingtothefullreverseddirection,leadingtoenhancedcoercivity.Inaddition,withincreasingthenanowirediameter,thecoercivityofthenanocompositedecreases,butthedipolarinteractionshowsdifferentrolesinmagneticreversalofnanocompositefordifferentdistributionsofnanowires.ThecurrentresultssuggestthatthecoercivityoftheNd2Fe14B/α-Fenanocompositecanbeenhancedbyintroducingthesoftmagneticnanowirearraywiththediameterlessthantheexchangelengthandwiththelongaxisalongthedirectionotherthantheeasyaxisofhardphase.