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1.
·Reviews·PhysicalandMathematicalModelingoftheArgon OxygenDecarburizationRefiningProcessofStainlessSteelWEIJi He  (1 )………………………………………………………………………………………………………·Letters·SteganographicTechniqueCapableofWithstandingRQPAnalysisWANGShuo Zhong ZHANGXin Peng ZHANG…  相似文献   

2.
1 Introduction ThespatialGreen’sfunctionsofmulti layeredmediaareusefulinanalysisofantennaandintegratedcircuitstructures.Theyareconstructedintwosteps.ThefirstistoderivethespectralGreen’sfunction .ThesecondistomakeinverseFouriertransformoftheGreen’sfunc t…  相似文献   

3.
TheKinematicsandForceAnalysisofaNewLegMechanismforMulti┐leggedWal┐ClimbingRobotLuoYiQianJinwuShenYaozongGongZhenbang(Schoolof...  相似文献   

4.
OurWebsiteforinternationalexchangehasnowcameintoexistence .Currently ,therearesixcolumnsonoursite ,namely :Presidents’mssage ,OurMission ,AboutUs ,ContactUs ,UpdatedEventsandCourses .ThesitehasbeenlinkedtothehomepageofShanghaiDistanceEducationGroup .Theset upo…  相似文献   

5.
INTRODUCTIONManyexperimentalandnumericalstudieshavebeencompletedtoinvestigatetheparticlemotioninturbulence .Previousfluiddynamicsstudieswerecommonlybasedontime averagedReynoldsequations,suchasthetwo equationmodel.Justlikethecarriergasphase,theparti cleph…  相似文献   

6.
1 Introduction Eu3 :Y2 SiO5crystalisusedasanewluminescencematerial.Becausethenuclearmomentsofthecom positeelementsaresmallinthiscrystal,thespin spininteractionbetweenguestandhostionsisminimized .Theguest hostinteractiondoesnotcauselargeaddi tionallinebroade…  相似文献   

7.
1 Introduction FerichnanocrystallineFeZrBalloyssimultaneouslyshowgoodsoftmagneticpropertiesandlargesaturationmagnetization[1,2].Therearemainlytwophasesinthealloyswithoptimummagneticproperties:ananocrystallineαFephaseandanintergranularamorphousphas…  相似文献   

8.
DynamicGraphicalSimulationofaLargeScaleMotorCraneChassisChenYunfeia(陈云飞)HuangXishib(黄锡时)XuShangxiana(许尚贤)(aDepartmentofMechan...  相似文献   

9.
INTRODUCTIONManygeneticmodelsbasedontheapproachofANOVA (analysisofvariance)weredevel opedbyFisher(1 92 5) .Someofthesemodels,e.g .NCdesignIandII(Comstocketal.,1 952 ;Hallaueretal.,1 981 ) ,diallelmodels(Yates,1 94 7;Griffing,1 956;GardnerandE berhart,1 966) ,arestillwidelyusedbypla…  相似文献   

10.
1 Introduction Fe3Albasedalloysexhibithighoxidationresistance ,excellentsulphidationresistanceandlowcostofalloyconstituents.However ,thesealloyshavenot yetfoundwidespreadapplicationfortheirenvironmentalembrittlement[1~ 3] .Thetensilepropertiesandenvi ronment…  相似文献   

11.
Nine limiting binaries of Al2O3-SiO2-Re2O3(Re=Nd, Sm, Gd and La) system are assessed. The binary diagrams or experimental information from Toropov, Mizuno, Aramaki, Bondar, Rolin and Coutures are optimized with the substitutional model of Kaufman and Nesor and the approximate formula of fusion free energy for rare earth element oxides of Wu and Pelton. The extracted Gibbs free energies of pure solid oxides and stoichiometric phases and the solution parameters are used to estimate the corresponding binaries, liquidus surfaces and a series of isothermal sections of four ternaries Al2O3-SiO2-Nd2O3, Al2O3-SiO2-Sm2O3, Al2O3-SiO2-Gd2O3, and Al2O3-SiO2-La2O3. In the Al2O3-SiO2-Gd2O3 system samples as fired at exact temperature with different compositions were analyzed by X-ray diffractometer and the detected results are fitted with the calculation of isothermal sections. Supported by State Key Lab of High Performance Ceramics and Superfine Micro-structure (9517 and 9708)  相似文献   

12.
合成了2,3-二氯异丁酸根和4-甲基吡啶氮氧化物稀土三元配合物(RE=La、Ce、Pr、Nd、Sm、Eu).通过元素分析、红外、紫外、热分析顺摩尔电导等分析手段、推定了配合物的组成为[REL3(4-picNO)H2O](L=CH3C2H2CI2COO-).  相似文献   

13.
为探究配体维生素B3(C6H5NO2)、8-羟基喹啉(C9H7NO)及其稀土配合物[RE(C6H4NO2)2(C9H6NO)].2H2O(RE=La、Nd、Sm)对红酵母生物活性的影响,本实验采用平板培养皿法和抑菌圈法测定了上述三元配合物及其配体对野生红酵母和实验红酵母生长活性的影响通过比较分析抑菌圈直径的大小,我们发现8-羟基喹啉(C9H7NO)对红酵母抑制作用较强,而维生素B3没有抑制作用,与稀土(RE=La、Nd、Sm)形成三元配合物后,Sm的三元配合物抑菌能力得到了加强,而Nd和La的三元配合物抑菌能力减弱初步推测Sm配合物可应用于红酵母危害的防治  相似文献   

14.
本文报道了14种新的固态稀上元素配合物(除C_e,P_m,L_u外),它们是用稀土的硝酸盐与1,4—双(1′—苯基—3′—甲基—5′—氧代吡唑—4′—基)—1,4苯二酮(简写为H_2L)在乙醇—水溶液中,于PH=5.8~6.0条件下反应而制得的.配合物的分子式为RE_2L_3·nH_2O(RE=La,Nd,n=8,RE=Pr,Sm,n=6.RE=Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Sc,Y,n=5).用化学分析,元素分析,紫外,红外、质子核磁共振,热分析和荧光谱对配合物进行了研究.根据以上研究,认为配合物具有双核结构.  相似文献   

15.
本文以间苯二甲亚胺双 (苯并 - 1 5 -冠 - 5)为配体 ,合成了十三种双冠醚稀土苦味酸盐配合物 ,Ln(Pic) 3·L·nH2 O[Ln=La ,n=5 ;Ln =Pr -Yb ,Y ,n =3 ;L =m -C6 H4(N =CH -B - 1 5-C - 5) 2 ] .通过元素分析、红外光谱、紫外光谱和差热—热重分析 ,对配合物的组成和性质进行了研究  相似文献   

16.
Siliconcarbide (SiC)ceramicmaterialsareusefulad vancedmaterialsinmanyfields,suchasmedicalbiomateri als ,hightemperaturesemiconductors ,synchrotronopticalel ementsandhighstrength /lightweightstructuralmaterials[1] .However,theactualapplicationisstilllimitedduetoitslowreliability ,highmachiningcosts[2 ] .Gelcastingprovidesane conomicalandfeasiblenet shape forminghomogeneousandflawlessgreenbodieswithcomplexgreenshapes.  Gelcastingconsistsofin situpolymerizationthroughwhichamacromolecularnetwor…  相似文献   

17.
合成了香草醛缩色氨酸席夫碱(简写为L)及其稀土La(III)、Nd(III)、Sm(III)、Ce(III)配合物,通过元素分析、摩尔电导、差热-热重分析、红外光谱、紫外光谱等手段.确定配合物为KRe(H2O)(NO3)·2H2O(Re=La,Nd,Sm,Ce).  相似文献   

18.
耿在丹  张波 《河南电大》2008,(3):109-110
利用Al-TiO2-C体系熔铸法制备含稀土LaO2原位自生Al2O3-TiCp/Al基复合材料,借助差示扫描量热仪(DSC)、扫描电子显微镜(SEM)、能谱分析仪(EDS)、X射线衍射仪(XRD)等测试技术,对Al-TiO2-C体系的组织结构进行了详尽的分析,讨论了稀土LaO2铝对Al2O3-TiCp/Al基复合材料的影响规律。实验结果表明,稀土LaO2的加入可改善陶瓷颗粒Al2O3和TiC与熔体的润湿性,而且有效细化和净化了组织,降低了反应温度。稀土LaO2添加剂含量为0,5%时利用熔铸法制备的复合材料中原位形的Al2O3,TiC颗粒尺寸较小,分布均匀。  相似文献   

19.
Thermodynamic assessment in the ternary systems ZrO2 -CeO2 -Y2 O3, ZrO2 -CeO2 -Ce2 03 and the limiting binaries ZrO2 -Y2 O3, ZrO2 -CeO2, CeO2 -Y2 03, ZrO2 -Ce2O3, CeO2 -Ce2O3 as well as the modeling for oxides are reviewed comprehensively. Based on the recent estimations on the YO1.5-CeO2, ZrO2-CeO2 and ZrO2 -YO1.6 systems, isothermal sections at 1273 and 1 973 K of the ternary CeO2- ZrO2-YO1.5system are calculated. In the system of ZrO2-CeO2-Ce2O3, the complex relation between the nonstoichiometry (y) in CeO2-x, the composition of the ZrO2 -CeO2 solid solution and the oxygen partial pressure (Po2 ) for different ZrO2 containing solid solutions CexZr1-xO2-x. are evaluated from 1 473 to 1 773 K. The relation between the degree of Ce^+4 reduction to Ce.3 under different Po2 in the fluorite CeO2-xy and CexZr1-xOz-x solid solutions at different temperatures can be used as a guide in the development of functional ceramics.  相似文献   

20.
1IntroductionZrO2-containing ceramics receive extensive attentionbecause of their great i mportance in science and tech-nology[1,2].Zirconia doped with divalent or trivalentoxides has been proved to be an i mportant solid elec-trolyte,finding wide usage in oxygen sensors and fuelcells.It is also well known that Y2O3-stabilized tetra-gonal ZrO2polycrystals(Y-TZP)possess excellent me-chanical properties at roomtemperature,combining astrength higher than1000MPa and a toughness be-tween6MPa·…  相似文献   

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