简介：Twocalix[4]arenederivativescontaining1,2,3-triazolemoietyweresynthesizedviaK2CO3-catalyzed1,3-dipolarcycloadditionreactionbetweencalix[4]arene-basedazideandactivemethylenecompoundsingoodyields.Thestructuresofthetwocompoundssynthesizedhereinwerefullyconfirmedby1HNMR,,13CNMR,andMS（ESI）.Thethermalanalysisshowedthatthemasslossesofthesynthesizedcompounds4and5containing1,2,3-triazolegroupsaresimilartoeachother.

简介：Theorientationoftheadditionof5-amino-3-benzylthio-1,2,4-triazoleanditsanalogues(pyrazole)(1)withthearylisocyanatecanbedirectedbycontrollingthereactiontemperatureandoneoftheproduct,5-amino-1-arylaminocarbonyl-3-benzylthio-1,2,4-triazole(pyrazole)(2),canrearrangeat170Ctoanotherproduct,5-arylureylene-3-benzylthio-1,2,4-triazole(pyrazole)(3).Aplausiblemechanismexplanationforthisrearrangementreactionwaspresented.Itwassuggestedthattherearrangementreactioncouldbereferredtothethermodynamicstranspositionleadingtothepredominant5-arylureylene-3-benzylthio-1,2,4-triazoleenergypreferentially.

简介：AccordingtoAWPAE11-2006standard,copperfixationratesofseveralcopper-basedformulations,suchasammoniacalcopper,aminecopper,andammoniacal-ethanolaminecopper,aswellasalkalinecopperquaternary(ACQ),weretestedandcomparedinthispaper.Andthefixationratesoftebuconazole(TEB)andpropiconazole(PPZ)inseveralformulations,suchascopperazole,emulsifiedtypeandsolventtype,werealsocompared.Thedeterminationofcoppercontentintheleachatewasanalyzedbyatomicabsorptionspectrom...

简介：Fourtriazoleenantiomersofdiclobutrazol(erythroform)(1),paclobutrazol(erythroform)(2),diniconazole(3)anduniconazole(4)havebeenseparatedbyhighperformanceliquidchro-matography(HPLC)onchiralstationaryphase(CSP)OA-4700.Chromatographicdataandachiralrecongnitionmodelarepresentedfortheseparationofthesepesticideenantiomers.Theinfluenceofcolumntemperatureandcompositionofmobilephasehavebeendescribed.

简介：三张氢契约钴(II)联网协作聚合物{[公司(btp)2(H2O)2]?楂?牴慩潺敬?湡?敂穮湥'O獩慣扲硯汹瑡?獉浯牥s

简介：Theefficientcycloadditionreactionswerecarriedouttoaffordthenovel3,5-disubstituted-dihydroisoxazolesfrommethylundec-10-enoateandisoxazoles,triazoleandtetrazolo-triazolefrommethylundec-10-ynoate.Thereactionsoccurredunderrelativelymildconditionsandaffordedthedesiredproductsingoodyields.

简介：Thetwocompounds,2,2-dimethyl-4-S-(N,N-dimethyldithiocarbamato)-5-(1,2,4-triazol-l-yl)-propione(1)and2,2-dimethyl-4-S-(N,N-diethyldithiocarbamato)-5-(1,2,4-triazol-1-yl)-3-propione(2),werepreparedbyreactingN,N-dialkyldithiocarbamatesodiumwith2,2-dimethyl-4-bromo-5-(1,2,4-triazol-1-yl)-propione.Theirstructureswereidentifiedbyelementalanalysis,IRand^1HNMRspectroscopy.Thestructureof1hasbeendeterminedbyX-raysinglecrystalstructureanalysis.ItcrystallizesinmonoclinicsystemwithspacegroupP21/c,a=1.2315(3)nm,b=1.2057(2)nm,c=1.2532(3)nm,β=118.55(3)°,Z=4,V=1.6345(6)nm^3,Dc=1.221g/cm^3,μ=0.324mm^-1,F(000)=640,finalR1=0.0449.ThereisobviouspotentiallyweakC—H...Nintermolecularinteractioninthecrystal,whichstabilizesthecrystalstructure.Theresultofthebiologicaltestshowedthatthetwocompoundshavefungistasisandplantgrowthregulatingactivities.

简介：2-Phenyl-1,2,3-triazole-4-formylhydrazine(2)waspreparedbyhydrazinolysisofthecorrespondingester1.Reactionof2withCS2/KOHgavetheoxadiazolederivatives(3)whichvia,Mannichreactionwithdifferentdialkylaminesfurnished3-N,N-dialkylderivatives(4a-c).Also,condensationof2withappropriatearomaticacidinPOCl3yieldedoxadiazolederivatives(5a-c),orwithaldehydesandketonesaffordedhydrazones(6a-c).Cyclizationof(6a-c)withaceticanhydridegavethedesireddihydroxadiazolederivatives(7a-c).Ontheotherhand,reactionofdithiocarbazate(8)withhydrazinehydrategavethecorrespondingtriazolederivative(9)whichontreatmentwithcarboxylicacidsinrefluxingPOCl3yieldeds-triazole[3,4-b]-1,3,4-thiadiazolederivatives(10a-b).ThestructuresofalltheabovecompoundswereconfirmedbymeansofIR,1HNMR,MSandelementalanalysis.

简介：Anewbis(aroylacetylene)containingtfiazoleandfluorenemoietiesissynthesizedbyclickchemistry.Polycyclotrimerizationofthemonomeriscatalyzedbypiperidineinrefluxeddioxane,furnishingaregioregularpoly(aroylarylene)inasatisfactoryyield.Thehyperbranchedstructureofthepolymerischaracterizedspectroscopicallywithsatisfactoryresults.Thepolymerenjoysnometaldetrimentandissolubleincommonorganicsolventssuchastetrahydrofuran(THF),chloroform,dichloromethane(DCM),andN...

简介：Themononuclearcomplex,[NtCl2(trzCHzCHzCOPh)4]·6H2O(trz=1,2,4-triazole),wassynthesizedanditsstructurewasdeterminedbysinglecrystalX-raydetermination.Itcrystallizesinthemonoclinicsystem,spacegroupP21/c,withlatticepa-rameters:a=0.80391(2)nm,b=1.06215(2)nm,c=2.90133(2)nm,β=94.792(1)°andZ=2.EachnickelatomiscoordinatedbyfourNatomsoftriazolefromfourβ-(1,2,4-IriHole-1-yl)propiophenoneligandsandtwochlorideanionsinarrangementwithoctahedralcoordinationgeometry.Inadditiontothecoordinatingnickelcomplex,therearesixunco-ordinatedwatermolecules.TheNi—Ndistanceis0.24865(8)nmandtheNi—Ndistaneesareintherangeof0.2072(2)to0.2099(2)nm,respectively.Inthesolidstate,theUtiecom-poundformsthreedimensionalnetworkstructurethroughhy-drogenbonds.Theintermolecularhydrogenbondsconnectthe[NiCl2(C2H2N3CH2CH2COPh)4]andH2Omoieties.Thedeepgreencrystalswerealsoexaminedbyelementalanalysis,FT-IRandUVspectra,whichareinagreementwiththestructuralda-ta.

简介：1989年11月至1990年7月之间,巧家县茂租乡连续发生爆炸、煤气中毒、杀人等三起案件,五人死于非命。案子几经反复,后在省公安厅专家帮助指导下告破。主观臆断、缺乏实事求是的科学态度,现场勘查及尸体检验不规范、班子不配套、现场分析研究缺乏并案侦查意识,业务素质不高等是造成案子几经反复所得的教训和启示。

简介：“３·３·３”制衡管理模式的核心内容是把场务会作为最高经营决策管理机构，场务会由人教委员、场务委员、财务委员三人组成。人教委员在人教方面具有５０％否决权，场务委员在场务方面具有５０％否决权，财务委员在财务方面具有５０％否决权，三个委员均在三个方面的另外两个方面具有２５％的表决权

简介：儿童心理学的研究如何更加有效地直接为提高我国人才素质服务?如何以心理科学为基础,立足于我国的教育实际,逐步建立我们自己的教育科学实验研究体系?为此目的,我们以“儿童推理过程的发展与教育”的实验研究为基础,经过多年的理论及上万人次的实验和各种形式的社会探测,逐步确定了《学习与全面发展》这个总课题,并把总课题的理论“物化”成一套工具——《3·3.3…系列智能学具》。我们这项研究的一个特点就是把科研成果的普及推广作为整个科研工作的有机组成部分。这套学具的应用过程就是我们同广大教师,家长和学生结合在一起深入进行科学实验的过程;同时它也是为教育实践服务取得社会效益的过程。目前,学具的一种型号已经在国内十多个省市的幼儿园、小学、中学、师范院校以及科研单位试用。为有组织、有计划地在国内逐步推广这项科研成果,我们已经同北京、天津、沈阳、徐州、蚌埠、杭州和遵义等地的有关单位签订了合作研究的协议书,还有几个地区的单位,即将同我们签订协议。为使各协作点的普及推广工作深入持久地向前推进,使这项科研成果更有效地为提高我国人才的素质和当前的教育改革服务,我们通过这个专栏:1.向老师、家长和学生提供有关学具的理论和方法方面的具体指导;2.介绍教师、家长和学生运用学具的收获体会、教案和个案等;3.交流各地协作研究工作的动态、信息。本栏的编者是中央教育科学研究所教育心理研究室的学习与发展组。愿这个专栏成为一座架在科研工作者与教育实际工作者之间的“立交桥”。欢迎各协作点的同志踊跃来稿。来稿可直接寄:北京北环西路10号中央教科所《3·3·3》编辑组。

简介：

简介：ThephaseandmorphologytransformationduringthehydrothermaltreatingprocessofY2O3wasevaluatedwithX-raydiffcrcnce(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),particlesizeandspecificsurfaceareadetermination.TheresultsshowedthatthecubicY2O3didnottransferintohexagonalY(OH)3inpurewater.Therefore,purehexagonalY(OH)3withnanotubeandmicrorodmorphologieswereobtainedbyhydrothermaltreatingY2O3at150℃for12hin15mlof2mol/LNaOHsolutionwithandwith-outPVAorPEGItwassuggestedthatthecharacteristicpreferentialgrowthofY(OH)3wasattributedtothestructureanisotropyofhexahedronY(OH)3.TheadditionofPVAorPEGcouldpromotetheformingprocessofnanotubesbyselectiveadsorptionondifferentcrystalplanes,whichalteredthegrowthratealongdifferentdirectionsandresultedinthediffusionlimitofconstructingionsinthecentertopofrods.Finally,Y(OH)3:EuandY2O3:Eunanotubeswerealsosynthesizedbyusingthismethod,andtheirphotoluminescencepropertieswereevaluated.

简介：动物王国秋季田径运动会激烈地进行着，小猪、小羊和小兔正在做准备，这时只听广播里说：“请3号运动员准备登场!”小羊听了说：“快，该我们3个登场了。”小兔说：“不对，不是3个，是3号!”小猪糊涂了：“3个和3号不同吗？”是啊，3个和3号难道不同吗？它们到底谁错了呢？聪明的小朋友，这里面有什么学问呢？下面就让我们来听听裁判员小猴的解释吧。

简介：摘要：本教学设计案例围绕 预备单元（Starter Unit 3What color is it ? ）展开。通过复习句型（What’s this/that? It’s an apple. What color is it? t’s red. Spell it ,please.It’s red）谈论物体颜色学习语法（an/a/the），同时训练学生听，说的能力 .本教学设计依据新课程标准要求，通过希沃游戏，大转盘游戏激发学生学习兴趣，采用图片直观教学法， 通过师生练习，小组练习，双人练习呈现新句型（It’s a red apple.The apple is red.），让学生观察发现总结 规律学习语法。通过完成听力任务培养学生抓住关键词寻找答案的听力技能，培养学生好的听力习惯 。同时以教材为本，结合实际，采用小组合作表演培养学生的口语技能和初步写作能力。本教学案例教学手段多样，使用希沃游戏教学，大转盘游戏，图片插入直观教学，图片裁剪，多媒体希沃白版5手机拍照视频上传，音乐剪辑插入播放等多种信息技术教学手段提高学生学习兴趣，调动学生积极性， 尽力让学生全体参与。教学过程中贯穿课程思政的理念，作业设计注重学生能力的培养。

简介：Aseriesofnovel1H-benzimidazol-1-ylacetatesand1H-benzimidazol-1-ylpropionatescontaining1H-1,2,4-triazolemoietyweresynthesizedundermicrowaveirradiationbymulti-stepreactions,inyieldsof87-94%.TheirinvitroantifungalactivitiesagainstBotrytiscinereaandSclerotiniasclerotiorumwereevaluatedbymycelialgrowthratemethod.AllthetargetcompoundsexhibithighactivitiesagainstB.cinereawiththeEC50valuesof7.96-21.74μg/mL,higherthanthatofcarbendazim.

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简介：Anewμ3-Otriiron（Ⅲ）complex[Fe3O（OBz）6（CH3OH）3]（NO3）（CH3OH）2（HOBZ=benzoicacid）hasbeensynthesized,itsstructurehasbeendeterminedandvariabletemperaturemagneticsusceptilityhasalsobeenmeasured.Inthemolecule,threeironatomsformedanequilateraltrianglewithu3-Oincenter.ThefittingtothemagneticsusceptibilityshowedthatanintramolecularantiferromagneticexchangeinteractionoccurredbetweenironatomswithJ=-25.51cm-1,andaweakerintermolecularantiferromagneticexchangeinteractionoccurredwithzJ’=-2.30cm-1.