简介：<正>Chinaisashopper’sdream.Itdoesn’ttakelongforanewcomertobecomeacquaintedquicklywiththehagglingexperience.Membersoftourgroups,unfortunately,areoftenatthereceivingendofarip-off,beitbecauseoftimerestraints,lackofinformation,orbeinginthewrongplace.The

简介：WENXiangcaiisonthestaffofChinaNationalEnvironmentalMonitoringCenter.Herjobiscollectingandaggregatingdata,whichisgreatforher-she’sascientist.ButinrecentyearsWenfeelslikeshe’sturnedintosomethingofamediapersonality.Sheisaskedquestionsonavarietyoftopicswhensheattendsconferences,andsheisofteninterviewedbyjournalistsforherexpertopinion.AsenvironmentalconsciousnesshasgrowninChinaoverthepastfewyears,moreandmorepeoplewanttoknow

简介：7癫痫的生酮饮食疗法结果:生酮饮食疗法用于治疗儿童难治性癫痫已有多年,但关于其作用机制的证据较少,最近才在瑞典被系统性应用。几项未设对照的试验证明:该疗法减少癫痫发作效果显著。已发现了一些副作用,尽管未被证实,但应该权衡其副作用与治疗难治性癫痫患者的预期效果。由于实施该疗法需要专业知识和经验,并需要家庭的积极配合,因此需要建立起系统随访的研究框架。目前还没有生酮饮食疗法使病人获益的证据,因此有必要继续评估该方法的疗效、副作用和成本。

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简介：摘要目的调查血液细菌的污染，探讨血液细菌筛检方法，预防和控制血液细菌污染，确保患者安全用血。方法通过分析BACT/ALERT3D系统对血液标本（无偿献血24小时后）进行细菌筛检，阳性标本作细菌鉴定。结果13548份血液中，初筛为阳性的105袋(0.78%)，复筛确认阳性的12袋(0.09%)，经转种、涂片后，鉴定为5瓶为污染，7瓶有分枝杆菌生长（其中4瓶为结核分枝杆菌、3瓶为非结核分枝杆菌）。结论目前的采血模式是安全的,梅里埃全自动细菌培养仪的微生物检测是精确检测病原体的检测系统，但仍需建立及逐步完善安全输血监测体系。

简介：摘要目的探讨血培养仪阳性报警时间对血流感染污染菌的排除及应用价值。方法用BacT/ALERT3D全自动血培养仪对9892例血培养进行检测，针对不同年龄患者对象选标准需氧瓶、厌氧瓶和儿童专用培养瓶进行增菌培养，凝固酶阴性葡萄球菌(Coagulase-negativestaphylococcal,CoNS)阳性报警时间大于20小时作为污染菌，阳性报警时间小于16小时的按感染菌向临床报告。结果血培养CNS阳性报警时间小于16h诊断血流感染的灵敏度为99.4%，特异度为99.8%，阳性预测值为99.8%，阴性预测值为99.8%，污染率为0.28%，血培养阳性率为12.29%（1216/9892），共检出33种菌，沙门氏菌占第1位，74.34%（904/1216）；CoNS占第2位，12.9%（157/1216）%；其次是大肠埃希菌，占3.54%（43/1216）。结论对CNS血培养阳性报警时间大于20h的可按污染菌处理，不向临床报告药敏结果，避免不必要应用万古霉素等抗生素治疗。

简介：Basedonobservationsofurbanmassconcentrationoffineparticulatemattersmallerthan2.5μmindiameter(PM_(2.5)),groundmeteorologicaldata,verticalmeasurementsofwinds,temperature,andrelativehumidity(RH),andECMWFreanalysisdata,themajorchangesintheverticalstructuresofmeteorologicalfactorsintheboundarylayer(BL)duringtheheavyaerosolpollutionepisodes(HPEs)thatoccurredinwinter2016intheurbanBeijingareawereanalyzed.TheHPEsaredividedintotwostages:thetransportofpollutantsunderprevailingsoutherlywinds,knownasthetransportstage(TS),andthePM_(2.5)explosivegrowthandpollutionaccumulationperiodcharacterizedbyatemperatureinversionwithlowwindsandhighRHinthelowerBL,knownasthecumulativestage(CS).DuringtheTS,asurfacehighliessouthofBeijing,andpollutantsaretransportednorthwards.DuringtheCS,astableBLformsandischaracterizedbyweakwinds,temperatureinversion,andmoistureaccumulation.Stableatmosphericstratificationfeaturedwithlight/calmwindsandaccumulatedmoisture(RH>80%)below250matthebeginningoftheCSiscloselyassociatedwiththeinversion,whichisstrengthenedbytheconsiderabledecreaseinnear-surfaceairtemperatureduetotheinteractionbetweenaerosolsandradiationaftertheaerosolpollutionoccurs.AsignificantincreaseinthePLAM(ParameterLinkingAerosolPollutionandMeteorologicalElements)indexisfound,whichislinearlyrelatedtoPMmasschange.Duringthefirst10hoftheCS,themorestableBLcontributesapproximately84%oftheexplosivegrowthofPM_(2.5)mass.Additionalaccumulatednear-surfacemoisturecausedbythegroundtemperaturedecrease,weakturbulentdiffusion,lowBLheight,andinhibitedverticalmixingofwatervaporisconducivetothesecondaryaerosolformationthroughchemicalreactions,includingliquidphaseandheterogeneousreactions,whichfurtherincreasesthePM_(2.5)concentrationlevels.Thecontributionofthesereactionmechanisms

简介：Basedonthecovariantprolongationstructuretechnique,weconstructtheintegrablehigher-orderdeformationsofthe(2+1)-dimensionalHeisenbergferromagnetmodelandobtaintheirsu(2)×R(λ)prolongationstructures.ByassociatingthesedeformedmultidimensionalHeisenbergferromagnetmodelswiththemovingspacecurveinEuclideanspaceandusingtheHasimotofunction,wederivetheirgeometricalequivalentcounterparts,i.e.,higher-order(2+1)-dimensionalnonlinearSchrdingerequations.