简介：Fe_(3–x)O_4raspberryshapednanostructures/graphenenanocompositesweresynthesizedbyaone-steppolyol-solvothermalmethodtobetestedaselectrodematerialsforLi-ionbattery(LIB).Indeed,Fe_(3–x)O_4raspberryshapednanostructuresconsistoforiginalorientedaggregatesofFe_(3–x)O_4magnetitenanocrystals,ensuringalowoxidationstateofmagnetiteandahollowandporousstructure,whichhasbeeneasilycombinedwithgraphenesheets.TheresultingnanocompositepowderdisplaysaveryhomogeneousspatialdistributionofFe_(3–x)O_4nanostructuresatthesurfaceofthegraphenesheets.TheseoriginalnanostructuresandtheirstronginteractionwiththegraphenesheetsresultedinverysmallcapacityfadinguponLi+ionintercalation.Reversiblecapacity,ashighas660mAh/g,makesthismaterialpromisingforanodeinLi-ionbatteriesapplication.

简介：首次采用体外抑制实验检测芦丁、异槲皮苷、紫云英苷、槲皮素4种黄酮化合物对5-脂氧合酶（5-LOX）抑制作用,4种化合物IC50值分别为44.18,94.17,172.49和468.45μmol/L.在超滤液质联用实验中测定4种化合物与5-LOX酶的结合率,其结果与体外抑制实验结果一致,表明芦丁对5-LOX有较强的抑制作用,其次为紫云英苷,而槲皮素和异槲皮苷对5-LOX几乎无作用.

简介：Vanadiumalloys(V-Cr-Tiseries)areimportantcandidatematerialsforblanketcomponentsoffusionreactorsduetotheirlowactivationandhighstrengthatelevatedtemperatures.Low-temperatureirradiationembrittlementdeterminestheoperationtemperaturelimitofVanadiumalloysfortheapplicationtostructuralmaterialsoffusionreactorsirradiationresponseofvanadiumalloysneedstobeclarifiedfortheirapplication.Inthepresentstudy,specimensoftwoalloys(V-4Cr-4TiandV-5Cr-5Ti)wereirradiatedwithenergeticHeionsandheavyionstounderstandhardeningofthealloysduetoheliumaccumulationandcascadedamageproduction.

简介：TheGroupofEnergyMaterials(GEM)inIMPisengagedintheirradiationresponseofmaterialscandidatetoadvancednuclearenergysystems(GenIV,fusionreactors).Themajorprogressofresearchinourgroupin2016isintheirradiationhardening/embrittlementofoxide-dispersion-strengthened(ODS)ferriticsteelsandVanadiumalloys,andinthemechanismsunderlyingdamageproductioninsiliconcarbide(SiC)fibers.Abriefdescriptionisgivenasfollows.1.EffectoftheoxidenanoparticlesontheirradiationhardeningofODSferriticsteelsTheinfluenceofoxidenanoparticlesontheirradiationresistanceofODSferriticsteelsisacrucialissuefortheupgradeofODSsteels.

简介：磁铁矿(Fe3有不同尺寸和形状的O4)nanoparticles被热分解方法综合。二条途径，非注射一个壶和热注射的方法，被设计详细调查生长机制。nanoparticles的尺寸和形状被调整先锋集中和持续时间时间决定，这被发现，它能好在我们的合成系统基于LaMer模型由机制解释了。monodisperseFe3O4nanoparticles从5nm有一条吝啬的直径到16nm，和形状进化从对球形三角形、立方。磁性是尺寸依赖者，和Fe3在关于在房间温度和最大的浸透磁化的5nm展览superparamagnetic性质的小尺寸的O4nanoparticles来临到78emu/g，而Fe3O4nanoparticles当直径增加到大约16nm时，开发铁磁性的性质。

简介：利用L-脯氨酸催化的5-氯水杨醛（1）与6-甲基-4-羟基吡喃酮（2）的缩合反应及硫酸铜催化下与1,3-二甲基-5-氨基吡唑（3）的串联反应,合成得到了10-氯-1,3-二甲基-5-（2-氧代丙基）色烯并[4,3-d]吡唑并[3,4-b]吡啶-6（3H）-酮（4）和10-氯-5-二乙氧基甲基-1,3-二甲基色烯并[4,3-d]吡唑并[3,4-b]吡啶-6（3H）-酮（5）.化合物5的结构通过单晶X射线衍射法确定：晶体属于三斜晶系,空间群P-1;相对分子质量Mr=803.68;晶胞参数a=1.03160（10）nm,b=1.42900（13）nm,c=1.44268（15）nm;V=1.9448（3）nm~3;Z=2;晶胞密度Dc=1.372g/cm~3;吸收系数μ=0.228mm-1;单胞中电子的数目F（000）=840.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.0681,wR=0.2051.在晶体结构中色烯环与吡啶环及吡唑环近似于共平面.

简介：我刊副主编王建国研究员及其学生陈娟和许宁合著的专著《弱条件稳定时域有限差分方法》已由科学出版社于2016年3月出版。该书主要介绍时域有限差分方法的各种快速算法,包括双向弱条件稳定FDTD方法、单向弱条件稳定FDTD方法和无条件稳定FDTD方法,具体内容包括：各种方法的公式推导、时间稳定性条件的证明、数值色散误差分析、连接边界和吸收边界的设置以及各种方法在圆柱坐标、旋转对称坐标、色散媒质和周期结构中的应用，书中对各种方法的计算精度、计算效率和内存需求进行了详细比较，并采用了大量的数值算例对算法进行了验证。

简介：一、筹算也称积算。在＂数术记遗＂一书中有明确记载：＂积算,今之常算者也,以竹为之,长四寸,以放（仿）四时,方三分,以象三才。言算法是包括天地,以烛人情。数始四时,终于大衍,又加循环,故曰今之常算是也。＂筹算的使用较早,它是继承了结绳、划痕计数。它的算法算理有一套完整的体系。

简介：以4-[（8-羟基-5-喹啉）偶氮]-苯磺酸与氯化钴为原料,采用溶剂热法通过原位反应合成{[Co（5-氨基-8-羟基喹啉）_2]·H_2O}_n,并通过X-射线单晶衍射方法确定了该配合物的晶体结构.结构分析表明：标题配合物属于斜方晶系,Pbcn空间群,晶胞参数a=1.321（2）nm,b=0.811（2）nm,c=1.511（2）nm,α=β=γ=90.00°,V=1.619（3）nm~3,Z=4,R_1=0.0516,wR_2=0.1025.配合物中存在ππ堆积相互作用和氢键作用,将配合物连接形成三维超分子网络结构.

简介：采用一步法合成了氨基化四氧化三铁（NH2-Fe3O4）磁性纳米材料,并以XRD,IR等手段对其进行了表征.将NH2-Fe3O4组装到磁性玻碳电极表面,得了NH2-Fe3O4修饰的磁玻碳电极,并以该修饰电极为工作电极,研究了其电化学性能.利用差分脉冲溶出伏安法研究了铅（Ⅱ）离子和铜（Ⅱ）离子在该修饰电极上的电化学行为.结果表明：NH2-Fe3O4纳米粒子可显著提高Pb2＋和Cu2＋在电极表面的富集量,提高溶出峰电流.由于差分脉冲溶出伏安曲线中Pb2＋和Cu2＋的溶出峰电位差较大,且没有相互干扰,所以该电极可用于Pb2＋和Cu2＋的同时测定.

简介：AseriesofnovelN-（3-furan-2-yl-1-phenyl-1H-pyrazol-5-yl）amidesderivativesweredesignedandsynthesized.Theirstructureswereconfirmedby1HNMR,13CNMRandHRMS.Alltitlecompoundswereevaluatedfortheirherbicidalandantifungalactivities.Preliminarybioassayresultsindicatedthatthetitlecompoundsshowedgoodtomoderateherbicidalactivityat1000mg/L.Compound6qpresentedthebestactivityagainstDigitariasanguinalis（L）Scop.,AmaranthusretroflexusL.andArabidopsisthalianawithaninhibitiondegreeoffive.Compound6dalsoshowedaninhibitiondegreeoffiveagainstD.sanguinalis.Inaddition,at50mg/L,mostcompoundsexhibitedgoodinvitroantifungalactivityagainstSclerotiniasclerotiorum,withcompound6cshowingover90%antifungalactivityagainstS.sclerotiorumandPelliculariasasakii.

简介：Weexperimentallydemonstratea4×4nonblockingsiliconthermo-optic(TO)switchfabricconsistingofthreestagesoftunablegeneralizedMach–Zehnderinterferometers.All24routingstatesfornonblockingswitchingarecharacterized.Thedevice’sfootprintis4.6mm×1.0mm.Measurementsshowthattheworstcrosstalkofallswitchingstatesis-7.2dB.Theon-chipinsertionlossisintherangeof3.7–13.1dB.TheaverageTOswitchingpowerconsumptionis104.8mW.

简介：AnewlayeredCu-basedoxychalcogenideBa3Fe2O5Cu2S2hasbeensynthesizedanditsmagneticandelectronicpropertieswererevealed.Ba3Fe2O5Cu2S2isbuiltupbyalternativelystacking[Cu2S2]2-layersandironperovskiteoxide[（FeO2）（BaO）（FeO2）]2-layersalongthecaxisthatareseparatedbybariumionswithFe3+fivefoldcoordinatedbyasquare-pyramidalarrangementofoxygen.Fromthebondvalencearguments,weinferredthatinlayeredCuCh-based（Ch=S,Se,Te）compoundsthe+3cationinperovskiteoxidesheetprefersasquarepyramidalsite,whilethelowervalencecationprefersthesquareplanarsites.Thestudiesonsusceptibility,transport,andopticalreflectivityindicatethatBa3Fe2O5Cu2S2isanantiferromagneticsemiconductorwithaNe′eltemperatureof121Kandanopticalbandgapof1.03eV.Themeasurementofheatcapacityfrom10Ktoroomtemperatureshowsnoanomalyat121K.TheDebyetemperatureisdeterminedtobe113K.TheoreticalcalculationsindicatethattheconductionbandminimumispredominantlycontributedbyO2pand3dstatesofFeionsthatantiferromagneticallyarrangedinFeO2layers.TheFe3dstatesarelocatedatlowerenergyandresultinanarrowbandgapincomparisonwiththatoftheisostructuralSr3Sc2O5Cu2S2.

简介：Broadband（1.6–18THz）terahertztime-domainspectroscopy（THz-TDS）andtime-resolvedterahertzspectroscopy（TRTS）wereperformedona54μmthickchalcogenideglass(As30Se30Te40)samplewithatwo-colorlaser-inducedairplasmaTHzsystemintransmissionandreflectionmodes,respectively.Twoabsorptionbandsat2–3and5–8THzwereobserved.TRTSrevealsanultrafastrelaxationprocessofthephotoinducedcarrierresponse,welldescribedbyarateequationmodelwithafiniteconcentrationofmid-bandgaptrapstatesforself-trappedexcitons.ThephotoinducedconductivitycanbewelldescribedbytheDrude–Smithconductivitymodelwithacarrierscatteringtimeof12–17fs,andweobservesignificantcarrierlocalizationeffects.Afastrefractiveindexchangewasobserved100fsbeforetheconductivityreacheditsmaximum,with2ordersofmagnitudelargeramplitudethanexpectedfortheopticallyinducedTHzKerreffect,indicatingthatfreecarriersareresponsibleforthetransientindexchange.

简介：Afacilestep-by-stepapproachisdevelopedforsynthesizingthehigh-efficiencyandmagneticrecyclableFe_3O_4@SiO_2@Ag@Nitrepang-likenanocomposites.ThismethodinvolvescoatingFe_2O_3nanorodswithauniformsilicalayer,reductionin10%H_2/AratmospheretotransformtheFe_2O_3intomagneticFe_3O_4,andfinallydepositingAg@Nicore-shellnanoparticlesontheL-lysinemodifiedsurfaceofFe_3O_4@SiO_2nanorods.Thefabricatednanocompositesarefurthercharacterizedbyx-raydiffraction,transmissionelectronmicroscopy,scanningelectronmicroscope,Fouriertransforminfraredspectroscopy,andinductivelycoupledplasmamassspectroscopy.TheFe_3O_4@SiO_2@Ag@Nitrepang-likenanocompositesexhibitremarkablyhighercatalyticefficiencythanmonometallicFe_3O_4@SiO_2@AgnanocompositestowardthedegradationofRhodamineB(RhB)atroomtemperature,andmaintainsuperiorcatalyticactivityevenaftersixcycles.Inaddition,thesesamplescouldbeeasilyseparatedfromthecatalyticsystembyanexternalmagnetandreused,whichshowsgreatpotentialapplicationsintreatingwastewater.

简介：采用CBS-QB3方法构建了丙烯酸甲酯（CH_2=CHCOOCH_3）与O_3反应体系的势能剖面并在此基础上利用经典过渡态理论（TST）和Wigner矫正模型计算了标题反应在200K～1200K温度区间内的速率常数kTST/W.研究结果表明,CH_2=CHCOOCH）3与O）3反应首先经过渡态生成一个稳定的五元环中间体,然后按断键位置不同,分别生成产物P1（CH_3OCOCHO＋CH_2O_2）和P2（CH）3OCOCHOO＋HCHO）.此外,速率常数结果显示,在计算温度范围内,标题反应速率常数呈正温度系数效应.294K时,CH_2=CHCOOCH_3与O_3反应速率常数为1.76×10^（-18）cm^3·molecule^（-1）·s^（-1）,与所测实验值（0.95±0.07）×10^（-18）cm^3·molecule^（-1）·s^（-1）非常接近.

简介：图表具有直观鲜明、通俗易懂、概括性强、信息容量大等特点。以图表为载体的实验教学可以激发学生的学习兴趣,还原基本的实验过程,扫除学生的思维障碍,提高学生的实验素养。本文主要就图表在实验教学中的应用做简要阐述和分析。

简介：为建立DMA-80直接测汞仪测定脉红螺中痕量汞的最优分析方法,通过正交实验优化了仪器分析程序,通过设置进样量梯度,确定了脉红螺样品的最佳进样量。结果表明：DMA-80最优分析程序为：干燥温度200℃,干燥时间150s,分解温度650℃,分解时间150s,齐化时间12s,氧气流量200mL/min,最佳进样量为0.1～0.2g（精确至0.0001g）,在0～20.0ng和20.0～1400.0ng范围内均呈良好的二次拟合,相关系数为1.000,检出限为0.02ng。采用国际标准物质贻贝组织（NISTSRM2976）验证了方法的准确度和精密度,分析结果表明：加标回收率为95.1%～102%,相对标准偏差（RSD）为1.6%～2.2%,精密度和准确度优于海洋行业标准＂HY/T147.3—2013＂方法中的规定。方法简便快速,重现性好,准确度高,可用于脉红螺中痕量汞的实际检测工作。

简介：基于刚性配体2-（4-噻唑基）苯并咪唑和二价金属铜离子在水热条件下成功地合成了2个Keggin型多酸化合物[CuⅡ（L1）2（H2O）]2[SiW12O40]（1）和[（L1）4（L2）2（H3PMo12O40）2]·5H2O（2）（L1=2-（4-噻唑基）苯并咪唑,L2=苯并咪唑）.通过单晶X-射线、红外光谱和元素分析对化合物1和2进行了表征.在化合物1中,存在2个独立的结构单元：Keggin型多酸和蝴蝶状的络合物阳离子[Cu（L1）2（H2O）]2＋.化合物2为含有混合配体的超分子结构,由Keggin型多酸、4个游离的L1和2个L2配体组成.此外,研究了化合物1和2的电化学和光催化性能.

简介：Athree-dimensionalfew-layerreducedgrapheneoxide-wrappedmesoporousLi4Ti5O12（m-LTO@FLRGO）electrodeisproducedusingasimplesolutionfabricationprocess.WhentestedasananodeforLiionbatteries,them-LTO@FL-RGOcompositeexhibitsexcellentratecapabilityandsuperiorcyclelife.Thecapacityofm-LTO@FL-RGOreaches165.4mAhg-1after100cyclesbetween1and2.5Vatarateof1C.Evenatarateof30C,ahighdischargecapacityof115.1mAhg-1isstillobtained,whichisthreetimeshigherthanthepristinemesoporousLi4Ti5O12（m-LTO）.Thegraphenenanosheetsareincorporatedintothem-LTOmicrosphereshomogenously,whichprovideahighconductivenetworkforelectrontransportation.