Discussion on the relationship between Δ V_(EB) and I_E presented in thermal resistance standard IEC60747-7 Version 2000

ThethermalresistancestandardinIEC74 7 7iswidelyacceptedandhasbeenusedtillnow .Itwaspublishedin 1988,andconfirmedin 1994and 2 0 0 0 ,respectively .ThethermalresistancestandardinGB/T 4 5 87 94ofChina[1] wasbasedontheIEC 74 7 7[2 ] .TheBSIEC 6 0 74 7 7:2 0 0 0 [3] ofUnitedKing domalsocamefromtheIEC 74 7 7.Fig .1(a)showsthecorrespondingFigs . 2 3and 2 4inIEC 74 7 7.Fig .2 3hastwoI Vcurves ,whichareI Vcurvesoftheemittercurrent (IE)andemitter basevoltage(VEB)atthejunctiontemperaturesT(…     

配合物[Cu(C2H8N2)2(H2O)2]2[Fe(CN)6]4H2O的合成与结构

合成了配合物[Cu(C2H8N2)2(H2O)2]2[Fe(CN)6]4H2O,通过元素分析、红外光谱、单晶X射线衍射进行了表征.配合物属单斜晶系,空间群C2/c,晶体学数据a=0.794 7(4)nm,b=0.899 8(5)nm,c=1.095 4(6)nm,β=91.380(8)°,V=0.767 7(7)nm3,Z=1,F(000)=378,R1=0.039 9,wR2=0.093 7.配合物由两个[Cu(C2H8N2)2(H2O)2]2+阳离子和一个[Fe(CN)6]4-阴离子组成.并由氢键等弱相互作用形成三维空间结构.     

Sol-gel-coated calix[4]arene fiber for solid-phase microextraction

Solid phasemicroextraction (SPME) [1 ] isaninnovativesamplepreconcentrationtechniqueandhasgainedawidespreadacceptanceinmanyareas.Uptonow ,thedevelopmentofnewfibercoatingsisstillacrucialaspect.Calixarenesareregardedasthethirdgenerationofsupramoleculesnexttocrownethersandcyclodextrins.TheyhavebeenwidelyusedandtheirapplicationsasGC[2 ] ,HPLC[3] andCE[4] stationaryphasehaveinterpretedspecialselectivity .Inthisstudy ,thesynthesized 5 ,11,17,2 3 tetra tert butyl 2 5 ,2 7 diethoxy 2 6 ,2 8 dihyd…     

Scheelite Sm-Nd dating and quartz Ar-Ar dating for Woxi Au-Sb-W deposit,western Hunan

SinceFryeretal.[1](1984)firstdatedthehydrother-maldepositusingtheSm-Ndisotopemethod,thisisotopesystematicshasbeenwidelyappliedinthegeochro-nologicalstudyforhydrothermalmineralization.Inrecentyears,manyhydrothermalmineralssuchasfluorite[2—7],tourmaline[8,9],wolframite[5,10,11]andcalcite[12,13]havebeensuccessfullydatedusingtheSm-Ndgeochronometer.ScheeliteisoneofCa-bearingminerals,andrareearthelements(REE)areincorporatedinscheelitebysubstitu-tionatCa2+structuralstiesinminerallattices;moreove…     

Synthesis,Structural Characterization,and Electrochemical Properties of Binuclear Copper(Ⅱ) Complexes Containing Tetradentate Schiff Base Ligand

Two binuclear copper(Ⅱ) complexes, [Cu2(saloph)2 (μ-O)2]-2(DMF)[H2saloph=N,N′-o-phenylenebis(salicylideneaminato)] (a) and [Cu2(salen)2(μ-O)2] [H2salen=N,N′-bis(salicylic-deneaminato) ethylene] (b)were synthesized and characterized by X-ray crystallography. Both of them have distorted rectangular pyramidal geometry around Cu(Ⅱ). The complete series of complexes show bridging phenoxo groups between the copper centers, together with hydroxo-bridges in these complexes. The complexes have also been characterized by elemental analysis, IR, TG-DTA, and electrochemical results.     

维药多伞阿魏的化学成分研究

为明确维药多伞阿魏(Ferula ferulaeoides)的主要化学成分及其抗肿瘤活性,采用硅胶柱色谱、Sephadex LH-20 凝胶柱色谱及半制备高效液相色谱法等技术进行分离纯化,运用NMR和HRMS等波谱学方法鉴定各化合物的结构,采用计算电子圆二色谱法（ECD）判定新化合物的绝对构型. 同时运用MTT法对分离得到的单体化合物在人源乳腺癌（MCF-7）细胞系上进行细胞毒活性测试. 结果从多伞阿魏的乙酸乙酯萃取物中分离得到15个化合物,分别鉴定为1- (2- hydroxyl- 4- methoxybenzoyl)- 2S*- hydroxy- 5,9,13- trimethyl- 4(E),8(E),12- tetradecatrien- 1- one ( 1 ),愈创木醇 ( 2 ),1- (2,4- dihydroxyphenyl)- 3,7,11- trimethyl- 3- vinyl- 6(E),10- dodecadiene- 1- one ( 3 ),dshamirone ( 4 ),2,3- dihydro-7- hydroxy- 2S*,3R*- dimethyl- 2- [4,8-dimethyl- 3(E),7- nonadienyl]- furo[3,2-c]coumarin ( 5 ),3- (2-hydroxyl-4-methoxybenzoyl)- 4S*,5R*- dimethyl- 5- [4,8- dimethyl- 3(E),7(E)- nonadien- 1- yl]tetrahydro- 2- furanone ( 6 ),fukanedone A ( 7 ),2,3- dihydro- 7- methoxy- 2S*,3R*- dimethyl- 2- [4- methyl- 5- (4-methyl-2-furyl)- 3(E)- pentenyl]- furo[3,2-c]coumarin ( 8 ),伞形花素 ( 9 ),2,3- dihydro- 7- methoxy- 2S*,3S*- dimethyl- 3- [4,8- dimethyl- 3(E),7- nonadienyl]- furo[3,2-c]coumarin ( 10 ),2,3- dihydro- 7- methoxy- 2S*,3R*- dimethyl- 3- [4,8-dimethyl-3(E),7-nonadienyl]- furo[3,2-c]coumarin ( 11 ),2,3- dihydro- 7- hydroxy- 2S*,3R*- dimethyl- 3- [4,8- dimethyl- 3(E),7- nonadienyl]- furo[3,2-c]coumarin ( 12 ),2,3- dihydro- 7- methoxy- 2S*,3R*- dimethyl- 2- [4,8- dimethyl- 3(E),7- nonadienyl]- furo[3,2-c]coumarin ( 13 ),2,3- dihydro- 7- methoxy- 2R*,3R*- dimethyl- 2- [4,8- dimethyl- 3(E),7- nonadienyl]- furo[3,2-c]coumarin ( 14 ),ferulaeone C ( 15 ). 其中,化合物 1 为新杂萜类化合物,化合物 9 是从该植物中首次分离得到. 化合物 3 、 4 、 5 和 15 表现出潜在的抗肿瘤活性,半数抑制浓度（IC₅₀）分别为15.11,12.98,18.01和12.87 μmol/L.      

PAMAMSA-M树枝状配合物作用下环己烯的催化氧化

合成了12种PAMAMSA(1～6G) M(PAMAM为聚酰胺 胺,SA为水杨醛,G为代数,M分别为Fe3 ,Co2 离子)树枝状高分子催化剂.在101 325kPa、70℃和无溶剂条件下,这些催化剂对环己烯分子氧氧化反应的催化效果良好.反应以7 氧杂二环[4,1,0]己烷(1),2 环己基 1 醇(2),2 环己基 1 酮(3)和7 氧杂二环[4,1,0]己烷 2 酮(4)为主要产物.其中产物7 氧杂二环[4,1,0]己烷 2 酮(4)为此类氧化反应中首次报道的新产物.     

Effects of the internal waves on the time correlation of the acoustic fields in the East China Sea

Theactivitiesoftheinternalwavecanmakethetemperatureoftheseawatermassvarywithtimeandspace ,andthencanaffectthesoundpropagationinthesea[1～ 7] .Inaddition ,itcanreducethecorrela tiontimeoftheacousticfields .Forexample ,intheSWARM 95experiment,thecorrelationtimeatarangeof 4 0kmislessthan 2minutes[6 ] .InJune 2 0 0 1,theAsianSeasInternationalA cousticsExperiment (ASIAEX)wasperformedintheEastChinaSea (ECS) .Acombinedacoustic/ physicaloceanographicexperimentalmeasurementwas per formedtostu…     

Cloning, Expression of Crocus sativus Phytoene Desaturase Gene and Preparation of Antiserum against It

0　IntroductionCarotenoidsareisoprenoidmoleculesneededin plantsforgrowthanddevelopment.Theyparticipateinlightharvest inginphotosyntheticmembranesandprotectthephotosyntheticapparatusfromexcessivelightenergybyquenchingtripletchloro phylls,superoxideanionradicalsandsingletoxygen[1 ] .Further more,theyareessentialcomponentsofsome pigment proteincomplexes[2 ] andareprecursorsofabscisicacid (ABA)oftheplanthormone[3] .Carotenoidsaresynthesizedandaccumulatedinplastidsbynuclear encodedenzymesinplasti…     

关于交换群的单个公理Ⅴ

本文的目的是给出三个新的表征交换群的单个公理。它们与已知的表征交换群的一些单个公理都不相同(看[1]、[2]、[3]、[4]、[5]、[6]、(7]、[8])。假定(G,·)是一个广群。这时可以利用运算.给G定义一个新的运算0:aob=a·[(b.b)     

顺铂代谢物[Pt(L-Met-S,N)2]跨细胞膜的吸收

对顺铂的主要代谢物[Pt(L-Met-S,N)2](Met:蛋氨酸)在Jurkat肿瘤细胞和绵羊红细胞内的跨膜吸收进行了研究,并以顺铂作对照.细胞内铂含量使用等离子体质谱(ICP-MS)测定.结果表明:2种细胞对[Pt(L-Met-S,N)2]的吸收曲线趋势一致,但吸收能力要远远低于对顺铂的吸收,这可能与[Pt(L-Met-S,N)2]的跨膜机制相关,同时进一步证实[Pt(L-Met-S,N)2]没有生物活性.     

钒取代磷钼杂多酸喹啉荷移盐的合成和表征

以 Keggin结构的钒取代磷钼酸为电子受体 ,喹啉为电子给体合成了两种新型电荷转移配合物[C9H7NH]4 H[PMo10 V2 O4 0 ]· C3 H7NO(配合物 ( 1 ) )和 [C9H7NH]6H3 [PMo6V6O4 0 ]· 2 C3 H7NO(配合物 ( 2 ) ) .用元素分析、红外光谱、电子光谱、电子自旋共振以及热重分析对它们进行了表征 .结果表明 :有机电子给体与杂多酸阴离子 ( POM)间有强烈的相互作用 ,光致变色后 ,配合物 ( 1 )、配合物 ( 2 )中有机物和杂多阴离子之间发生了电荷转移 ,导致杂多阴离子中 V 还原为 V ,同时喹啉被氧化     

Synthesis, Structure and Antitumor Activities of [Ni(dien)_2] [Ni(CN)_4] Complex

0　IntroductionPolyaminesarepresentinalllivingcells,prokaryotes,eu karyotes,plantsandanimals.Inmammaliancells,thenat uralpolyamines—putrescine ,spermidineandspermine———arefoundinmillimolarconcentrations.Polyamineshavespecificrolesinembryonicdevelopment,cellcycle,can cer,neurochemistry,aswellaspulmonaryandimmunesystemfunctions[1 5] .Ithasbeenreportedthatethylenediamine (en) ,diethylenetriamine (dien) ,andtriethylenetetraamine (trien)couldeffectivelyhydrolyzeRNA[6 ,7] .Recently ,Carotti[8…     

两种异喹啉-7-酮的合成、表征及量化计算研究

合成了异喹啉-7-酮衍生物,7H-苯并咪唑[2,1,-a]联苯[de]异喹啉-7-酮(1)和4-溴代-7H-苯并咪唑[2,1,-a]联苯[de]异喹啉-7-酮(2),并用红外、核磁共振、紫外可见光谱和荧光光谱进行了表征.对于这两个化合物,使用密度泛函(DFT)方法,在B3LYP/6-311G**水平上,计算了它们几何结构和原子电荷自然布居分析.使用TD-DFT方法,预测了化合物1和化合物2的电子光谱,结果表明与实验电子光谱相吻合.在萘环的4位处引入Br吸电子基团将会改变化合物1和化合物2电子光谱和荧光光谱峰的强度和位置.     

{[PMo12O40][Ce(DMF)7]2}·{PMo12O40}的合成及晶体结构

以α-H3PMo12 O40·24H2 O,CeCl3·7H2 O和DMF(N,N-二甲基甲酰胺)为原料,在乙腈和水的混合溶剂中合成了具有Keggin结构的标题化合物{[PM012040][Ce(DMF)7]2)·{PMo12 O 40}.以单晶X-射线衍射分析、IR光谱和TG分析对其进行了表征.该化合物属于单斜晶系,P2(1)/c空间群.晶体结构中包含2个[Ce(DMF)7]3+配阳离子和2个[PMo12 O40]3-阴离子,其中1个多酸阴离子独立存在,而另1个多酸阴离子同时与2个[Ce(DMF)7]3+配阳离子配位.在配阳离子中,Ce3+与7个DMF分子中的7个氧和1个多酸阴离子的1个端基氧配位.IR光谱和X-射线单晶结构分析显示在固态条件下配阳离子与杂多阴离子之间存在较强的相互作用.热分析表明,由于Ce3+阳离子的影响,标题化合物中[PMo12 O40]3-阴离子的稳定性明显提高.     

Petrological implication of wagnerite-Ma5bc in the quartzofeldspathic gneiss, Larsemann Hills, East Antarctica

Mg dominantmineralsofwagnerite triplite group,i.e.(Mg,Fe,Mn)2(PO4)(F,OH),arerelativelyrare,buthavebeenfoundinawidevariety ofgeologicenvironments,includingmetamorphic rocksofallgrades[1]suchasquartz carbonateveinsof hydrothermalorigin,pegmatites,kyanite quartzite,micaschist,sillimanitegneiss,andmagnetiteores.Uptonow,wagneriteispresentmainlyasthe Ma2bcpolytype,anaccessorymineralincalcium poorrocks[2,5]inwhichapatite,ifpresent,oftenoc cursasretrograderimaroundwagnerite.Henriques[6]reportedasma…     

含有XW_9O_(33)~(9-)(X=As~Ⅲ,Sb~Ⅲ,Bi~Ⅲ)杂多钨酸盐的研究进展

~~1.2　 {As W9O3 3 }2由过渡金属等连接两个 As W9O3 3 9-可形成夹层型结构聚阴离子 .图 2示出了 As2 W2 1O69( H2 O) 6-的结构 [11] ,夹层中的 3个 W可以被其他的过渡金属等离子或基团所取代 ,从而形成单取代、双取代和三取代夹心型化合物 ,如单取代化合物 [As2 MW2 0 O68( H2 O) 2 ]8-( M=Co2 + ,Zn2 + ) [12 ] ,双取代化合物 [( α-As W9O3 3 ) 2 WO ( H2 O) M2 ( H2 O) 2 ]10 -( M =Zn2 + ,Mn2 + ) [13 ] ,[( Hg2 ) 2 WO( H2 O) ( As2 W9O3 3 ) 2 ]10 -[14 ](图 3) ,[{( ph Sn ) 2 O2 }2 H (α- As W9O3 3 ) 2 ]9-…     

Genetic diversity revealed by genomic-SSR and EST-SSR markers among common wheat, spelt and compactum

Spelt (TriticumspeltaL .) ,oncebeingthemaincropinEurope ,hasthesamegenome (AABB DD)ascommonwheat (TriticumaestivumL .) .Althoughitiscultivatedonasmallscale ,theproduc tionofspeltisclosetoorevenexceedsthatofcom monwheatinsomeregions[1] .Speltiswidelyadapt edtoavarietyofenvironmentconditions ,itsgrainscontainlargequantitiesofproteinandaresuitableforthemanufactureofsoftbread .Therefore ,speltisre ceivingincreasingattentionforplantbreeders[2 ] .ThemostrecentstudyelucidatedthattheF1generationb…     

Gas-Phase Beckmann Rearrangement of Cyclohexanone Oxime over B-ZSM-5 Derived Titanosilicalite

IntroductionDue to its remarkable catalysis,titanosilicalite hasattracted considerable attention[13 ] . Titano-silicalite- 1 prepared by hydrothermal synthesis[4]exhibits much better catalytic performance for thegas- phase Beckmann rearrangement ofcyclohexanone oxime ( CHO ) into lactam thanother solid catalysts,such as silicalite- 1 [4] ,B2 O3 /Zr O2 [5] ,Ta2 O5/ Si O2 [6] ,HZSM- 5 [7] ,Hβ[8] ,andHMCM- 41 [9] .However,it is surprising that onlytwo papers have been published on the re…     

整函数的[p,q]级与[p,q]型

研究了当整函数当f_1(z)与f_2(z)具有相同[p,q]级和不同[p,q]型时,f_1+f_2,f_1f_2的[p,q]级与[p,q]型,丰富和推广了原有的一些结果。