简介：建立一个数学问题,综合两个解法得到了结论。

简介：<正>现代汉语中,“不”字不能和体词性成分组合。不过前后同形的体词性成分之间可以加“不”字构成“N不N”格式。例如:(1)这关头,还有什么集体不集体!只能靠各自的直觉判断。(《十月》1984年第6期)(2)右派不右派与我什么相干!反右时我象海边远远一个小石子,浪花也没溅到我身上。(《小说选刊》1985年第6期)(3)甚么酒馆不酒馆,滚它的。(《契诃夫小说选》P43)(4)朱老忠说:“老英雄不老英雄,反正退回十几年去,有三五个人,走不到咱跟前。(梁斌《红旗谱》P304)本文从语法、语义、语用三个角度,粗略地分析“N不N”格式的特点。一“N不N”格式,根据一定的形式特征可以分为两大类:一类是多项“N不N”并列的形式,我们叫做A类;另一类是只有一项“N不N”的形式,我们叫做B类。我们先讨论A

简介：本文介绍了４００米跑的实质、该项对身体素质要求的水平及有效的训练手段。

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简介：2009，国际天文年伽利略首次将望远镜指向星空，打开人类认识宇宙新视野这一壮举，距今已有400年。为了展示数百年来天文学发展取得的伟大成就，国际天文学联合会（IAU）和联合国教科文组织（UNESCO）正式命名2009年为“国际天文年”。主题是“探索我们的宇宙”，希望通过白天的天空和夜晚星空的观察，帮助人们重新认识自己在宇宙中的位置，从而激发人们的探索发现精神。

简介：<正>Usingsubtractioncloning,weidentifiedthehumanN-MycDownstream-RegulatedGene-2(hNDRG2),locatedat14q11.2,asacandidatetumorsuppressorgene.Semi-quantitativeRT-PCRshowedthattheexpressionofhNDRG2in15of27(56%)humanGBMtissuesandall6humanglioblastomacelllineswassignificantlylowerthanthatinthenormalbrain.TheexpressionofhNDRG2alsowasevaluatedin60lung-carcinomapatients.17of26casesofsquamouscarcinomaand4of11casesofsmallcelllungcancerdisplayed

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简介：The2-Dheteronuclearcoordinationpolymer{[Ag4Fe2(SCN)12(H2O)2][(inaH)2(H2O)2]}n(1)(inaHistheabbreviationofprotonatedisonicotinicacid)withchemicalformulaC24H20Ag4Fe2N14O8S12hasbeensynthesizedandcharacterizedbysinglecrystalX-raydiffraction,elementalanalysisandIRspectroscopy.TheAgES2ringsconnecttwokindsofoctahedralgeometriesofFe(Ⅲ)ions,[Fe(NCS)6]^3-and[Fe(H2O)E(NCS)4]^-unitswithbridgingthiocyanateionsleadingto2-D[Ag4Fe2(SCN)12(H2O)2]^2-anionframework.Fourkindsofringsincludingtheunprecedentedthirty-twomemberedAg4Fe4(SCN)8ringssharecomersoredgesinthe2-Danionlayerstructure.AllthiocyanatescoordinatetothemetalionsaccordingtotheHSABprinciplewithNatomsbindingtotheFe(Ⅲ)ionsandwithSatomsbindingtoAg(I)ions.Pronoatedinacationsstabilizethelayerstructureascounterionsandhydrogenbondswereformedwithinthepronoatedinacationsdimerandbetweenthedimersandthelatticewaters.Crystaldata:Mr=1560.44,triclinic,P-↑1,a=0.76082(1)nm,b=0.9234nm,c=1.85611(4)nm,α=103.0170(10)°,β=93.7780(10)°,γ=97.4080(10)°,V=1.25385(3)nm^3,Z=1,μ(MoKα)=2.650mm^-1,Dc=2.067g·cm^-3,F(000)=758,R1=0.0412,wR2=0.1003.

简介：摘 要：抱杆是输电线路立塔过程中主要的受力工器具，抱杆的受力状况及稳定性，关系着整个立塔施工的安全。对于对其进行受力分析，是很有必要的。本文通过借助 ANSYS Workbench静力学对抱杆进行分析，计算出抱杆所承受的最大载荷，由此作为不同工况下选用抱杆的依据。

简介：合成了一种未见报道的标题化合物（（C5N2H6）3（C5N2H7）3[（PO4）Mo12O36]·2H2O,Mr=2403.00）并得到单晶,晶体衍射实验发现其属于单斜晶系,P2（1）/n空间群,晶体学参数：a=13.316（3）,b=22.414（5）,c=20.063（4）,α=90.00（4）°,β=100.743（3）°,γ=90.00°,V=5883（2）3,Z=4,Dc=2.713Mg/m3,μ（MoKα）=2.608mm-1,F000=4604,最终R=0.0596,wR=0.1345,GoF=1.042.配体由由簇阴离子[（PO4）Mo12O36]3-之间通过端基氧与2-氨基吡啶形成氢键而相互连接,中间填充了一些水分子及2-氨基吡啶.

简介：证明了对于一个n-维赋范空间X，如果b#=2n-1，则它一定包含一个与（R^n-1，‖‖∞）等距同构的子空间．

简介：针对“把（给）＋NP＋V1NP＋V2（N）”式动词性短语,运用句法研究和语义搭配相结合的方法分析了其归属问题,提出了“含兼式”短语的观点.

简介：Thebilinearformofthe(2+1)-dimensionalnon-isospectralAKNSsystemisderived.ItsN-solitonsolutionsareobtainedbyusingtheHirotamethod.Asareduction,a(2+1)-dimensionalnon-isospectralSchrdingerequationanditsN-solitonsolutionsareconstructed.

简介：摘要目的探讨规范N2级护士晨间护理查房，提高N2级及专科各层次护士业务素质和临床护理质量。方法由科室护士长提前一周安排N2级护士准备查房内容，利用每周三晨间交班时间以开放式探讨方式进行。结果通过规范N2级护士晨间护理查房，提高了N2级护士及专科各层次护士的临床业务水平和护理质量。结论有计划、有目标地组织、规范N2级护士晨间护理查房，是提高N2级护士及专科各层次护士业务知识和护理水平的有效方法。

简介：Industrialproductionprocessincludingnitricacidproductionisanimportantgreenhousegasemissionsource.AlthoughIPCCguidelineshavegivencalculationmethodsandemissionfactorsforN2Oemissionfromnitricacidproduction,emissionfactorsofnitricacidproductioninChinaarenotgiven.AnditcanbeseenfromthecomparisonoftheguidelinesandregisteredCDMprojectsinChinathattheN2OemissionfactorsgivenintheIPCCguidelinesandactualN2OemissionfromnitricacidproductioninChinadiffergreatlywhilemeasuredN2Oemissiondataisnotavailable,sodeterminationofemissionfactorsforN2OemissionfromnitricacidproductionisanimportantbasicresearchforN2OemissioncalculationinChina.ThemethodthatcalculateN2OemissionfactorsfromnitricacidproductioninChinaisstudiedwithbaselineemissionfactorsbasedonactualmeasurementofregisteredCDMprojectsandthecalculatedemissionfactoriscomparedwiththatgivenintheIPCCguidelinesinthetext.

简介：W，N共同做TiO2nanoparticles被一个solgel方法综合。准备样品被X光检查衍射(XRD)描绘，域排放扫描电子显微镜学(FE-SEM)，传播电子显微镜学(TEM)，Fourier变换红外线的光谱学(英尺红外)，X光检查光电子光谱学(XPS)和弥漫的反射spectrophotometry(医生)。结果证明共同做的光催化剂是有22.5nm的最小的粒子尺寸的实质上一致的球形的粒子。比作未做的TiO2，N-TiO2和P-25，W的吸收边，N共同做转移到更长的波长的TiO2和它为在Xe灯(350W)下面的甲基橘子(瞬间)的降级的photocatalytic活动更高。

简介：Aseriesofcopper(Ⅱ)complexeswithpyridineN-oxide-2-ylmethylidened-ithiocarbazatesasligandsweresynthesizedandcharacterizedbyIRspectra,electronicspectraandmagneticmomentsmeasurementatroomtemperature.Variabletemperaturemagneticsusceptibilites(3-300K)offourcomplexsweremeasuredandfittedwiththeBleaney-Bowersdimerequationbyconsideringthemagneticinteractionbetweenmolecules.Thefittingresultsshowtheexistenceofintramolecularferromagneticinteractionsandintermolecu-laranti-ferromagneticinteractionsinthesecopper(Ⅱ)complexes.

简介：AfieldexperimentwasconductedonChinesecabbage(BrassicacampestrisL.ssp.pekinensis(Lour.)Olsson)inaNanjingsuburbin2003.Theexperimentincluded4treatmentsinarandomizedcompleteblockdesignwith3replicates:zerochemicalfertilizerN(CK);ureaatratesof300kgNha-1(U300)and600kgNha-1(U600),bothasbasalandtwotopdressings;andpolymer-coatedureaatarateof180kgNha-1(PCU180)asabasalapplication.Theacetyleneinhibitiontechniquewasusedtomeasuredenitrification(N2+N2O)fromintactsoilcoresandN2Oemissionsintheabsenceofacetylene.ResultsshowedthatcomparedtoCKtotaldenitrificationlossesweresignificantlygreater(P≤0.05)inthePCU180,U300,andU600treatments,whileN2OemissionsintheU300andU600treatmentsweresignificantlyhigher(P≤0.05)thanCK.IntheU300andU600treatmentspeaksofdenitrificationandN2OemissionwereusuallyobservedafterNapplication.Inthepolymer-coatedureatreatment(PCU180)duringtheperiod20to40daysaftertransplanting,higherdenitrificationratesandN2Ofluxesoccurred.Comparedwithurea,polymer-coatedureadidnotshowanyeffectonreducingdenitrificationlossesandN2OemissionsintermsofpercentageofappliedN.Astemperaturegraduallydecreasedfromtransplantingtoharvest,denitrificationratesandN2Oemissionstendedtodecrease.Asignificant(P≤0.01)positivecorrelationoccurredbetweendenitrification(r=0.872)orN2Oemission(r=0.781)fluxdensitiesandsoiltemperatureintheCKtreatmentwithastablenitratecontentduringthewholegrowingseason.

简介：ThispaperstudiestheequilibriumgeometriesandelectronicpropertiesofBenandBenLiclusters,upton=15,byusingdensity-functionaltheory(DFT)atB3LYP/6-31G(d)level.Thelowest-energystructuresofBenandBenLiclustersweredetermined.Theresultsindicatethatasinglelithiumimpurityenhancesthestabilityandchemicalreactivityoftheberylliumclusters.Itfindsthatthegeometriesofthehostclusterschangesignificantlyaftertheadditionofthelithiumatomforn≥8.Thelithiumimpuritypreferstobeontheperipheryofberylliumclusters,andoccupiesvertexsites.BothBe4Li,Be9Li,andBe13Liwerefoundtobeparticularlystablewithhigheraveragebindingenergy,localpeaksofsecond-orderenergydifferenceandfragmentationenergies.ForalltheBenLiclustersstudied,wefoundchargetransfersfromtheLitoBesiteandco-existenceofcovalentandmetallicbondingcharacteristics.更多还原

简介：摘要目的对瑞芬太尼复合N2O、异氟醚与单纯吸入N2O和异氟醚麻醉对比观察临床效果。选择ASAⅠ～Ⅱ级病人106例，随机分为两组，A组给予TCI泵入瑞芬太尼,吸入N2O、异氟醚，B组吸入N2O、异氟醚。结果苏醒时间A组（5±2）min明显短于B组（8±3）min（P＜0.05），A组异氟醚用量明显少于B组用量（P＜0.05），有显著性差异。结论瑞芬太尼复合N2O、异氟醚麻醉可以减少吸入麻醉药用量，术中血流动力学稳定，苏醒快。