简介：有一个古老的数学命题：树上有10只麻雀，被枪打死一只，这时树上还有几只？幼稚的孩子往往这样回答：还有九只：而聪明的孩子则这样回答，一只也没有了。道理很简单，虽然打死一只，但吓飞了九只，当然也就一只没有了。这是测试儿童智力的趣味数学，然而却给人们许多启迪。

简介：Layeredcathodematerialsofhigh-temperaturelithiumbatteries,LiNi1/3Mn1/3Co1/3O2aresynthesizedbyasol-gelmethodwithvariationinfinalsinteringtemperatureforboreholeapplications.Thestructure,morphologyandhigh-temperaturedischargeperformanceoftheseresultingproductsareinvestigatedbyX-RayDiffraction（XRD）,scanningelectronmicroscopy（SEM）,laserparticlesizeanalysis,galvanostaticandpulsedischarge.Theresultsofstructuralanalysisindicatethatthesamplesinteredat800℃hasthecharacteristicsofgoodcrystallinity,narrowsizedistributionandlargespecificsurfaceareaatthesametime.Thedischargeexperimentsalsoindicatethatthissamplehasthebestelectrochemicalproperties,withthemaximumdischargecapacitiesof314.57and434.14mAh·g-1at200and300℃respectivelyandtheminimumcellinternalresistancesatbothtemperatures.

简介：俄罗斯军工综合体新闻网消息，俄罗斯“LT-化学复合材料”股份公司旗下的特维尔全俄合成纤维科研院，开发出一种用于生产高强度超高分子量聚乙烯加强线的新技术。该公司称，这种复合材料制成的加强线可使无人机的重量减少1至1．5倍。

简介：设计竞赛简介：为提高自主品牌工业产品外观设计的创新能力，加速创意设计与工业产品外观的有机融合，强化知识产权保护意识，为企事业单位和设计爱好者搭建展示、交流、保护和交易外观设计作品的平台，从2004年起至今由哈尔滨市科学技术局、哈尔滨市知识产权局联合主办，哈尔滨市知识产权服务中心承办每年举办哈尔滨工业品外观设计大赛。

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简介：Intrinsiccarrierconcentration（ni）isoneofthemostimportantphysicalparametersforunderstandingthephysicsofstrainedSiandSi1-xGexmaterialsaswellasforevaluatingtheelectricalpropertiesofSi-basedstraineddevices.Uptonow,thereportonquantitativeresultsofintrinsiccarrierconcentrationinstrainedSiandSi1-xGexmaterialshasbeenstilllacking.Inthispaper,byanalyzingthebandstructureofstrainedSiandSi1-xGexmaterials,boththeeffectivedensitiesofthestatenearthetopofvalencebandandthebottomofconductionband（NcandNv）at218,330and393KandtheintrinsiccarrierconcentrationrelatedtoGefraction（x）at300KweresystematicallystudiedwithintheframeworkofKPtheoryandsemiconductorphysics.ItisfoundthattheintrinsiccarrierconcentrationinstrainedSi（001）andSi1-xGex（001）and（101）materialsat300KincreasessignificantlywithincreasingGefraction（x）,whichprovidesvaluablereferencestounderstandtheSibasedstraineddevicephysicsanddesign.

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简介：AseriesofCd1-xZnxS/K2La2Ti3O10compositesweresynthesizedviaasimpleco-precipitationmethod.ThepreparedsampleswerecharacterizedbyX-raydiffraction（XRD）,scanningelectronmicroscopy（SEM）,X-rayenergydispersivespectroscopy（EDX）,ultraviolet-visiblediffusereflection（UV-Vis）,X-rayphotoelectronspectroscopy（XPS）andphotoluminescence（PL）measurements.ThecompositestructuresconsistedofCd1-xZnxSnanoparticlesevenlydistributedonthesurfaceofK2La2Ti3O10.TheabsorptionedgeofK2La2Ti3O10shiftedtothevisiblelightregionuponintroductionoftheCd1-xZnxSnanoparticles.Thephotocatalyticactivitiesofthecatalystswereevaluatedbyhydrogenproductionundervisiblelightirradiation.ThepreparedCd0.8Zn0.2S（30wt%）/K2La2Ti3O10exhibitedhigherphotocatalyticactivity,evolving6.92mmol/gH2undervisiblelightirradiationfor3h.ThepromotedphotocatalyticactivityofthecompositeswasattributedtothesynergisticeffectbetweenCd1-xZnxSandK2La2Ti3O10,whichresultedinenhancedseparationofphotogeneratedelectronsandholes.