1—(3—吡啶甲酰)—4—芳基氨基硫脲类和3—(3—吡啶基)—4—芳基—1,2,4—三唑啉—5—硫酮类化合物~(13)C—NMR谱研究

本文测定了1-(3—吡啶甲酰)—4—苯基氨基硫脲、3—(3—吡啶基)—4—苯基—1,2,4—三唑啉—5—硫酮等8个新化合物的~(13)C NMR谱,运用质子宽带去偶、偏共振去偶,结合信号强度对比、苯基取代基效应的计算,同时与模型化合物对照,一一归属了其谱峰。本文对这两类化合物之间的~(13)C NMR谱差异进行了探讨,并得到了在吡啶环3位取代的甲酰肼基对吡啶环各碳取代基效应的数据。     

4—3—N矩阵立体声系统

文中首先证明了全景(立体)声系统中的独立信号只有三个;而这三个通路信号的选择方式却有多种。若令L_F,R_F,L_B及R_B分别表示四通路立体声系统中的左前、右前、左后及右后四个方向信号,并且取下列矩阵编码成三个传输(或记录)信号MSD,LDR,…等:     

KⅧ—TbLⅣ离子3s3p 3P1—3s21S0 的自旋禁戒跃迁

在对KⅧ—TbLⅣ离子3s3p3P1能级结构的多组态相互作用理论HXR方法计算的基础上, 分析了各种效应对等电子序列离子能级结构的影响, 找出了能级沿等电子序列变化的规律性. 预测计算了KⅧ—TbLⅣ离子3s3p3P1的能级. 由此进一步计算了KⅧ—TbLⅣ离子自旋禁戒跃迁3s3p3P1—3s21S0的谱线波长、 振子强度和跃迁概率. We have calculated the energy levels of 3s3p3P1 for magnesium like sequence ions from KⅧ—TbLⅣ by HXR (Hartree Forck plus statistical exchange potential with relativistic corrections) method. With the important effects taken into account, we have made a systematic fit for the energy levels of the ions mentioned above. We predicted here the energy levels which have not been observed in experiments for ions from KⅧ to TbLⅣ.The wavelengths, oscillator strengths and probabilities of intercombination transitions 3s3p 3P1—3s21S0 are computed too.     

Colossal Magnetoresistive p—n Junctions of Te—Doped LaMnO3／Nb—doped SrTiO3

We have fabricated colossal magnetoresistive (CMR) p-n unctions made of Te-doped LaMnO3 and Nb_dopoed SrTiO3 with laser molecular beam epitaxy.The I-V characteristics of the La 0.9Te0.1MnO3/SrNb 0.01Ti0.99O3p-n junctions as a function of applied magnetic field(0-5T) wrer experimentally studied in the temperature range 77-300K.The results indicate that the p-n junction exhibited the CMR behaviour.The magnetoresistance (MR) is positive at 220K and 300K,while it displays a negative MR at 77K.For a positive bias.the MR ratios (ΔR/R0,ΔR=RH-R0)are 7.5% at 0.1T and 18% at 5T for 300K,5%at 0.1T and 33%at 5T for 220K,for 300K,5.1%at 0.1T and 15%at 3T for 220K-19%at 0.1T and -72% at 5T for 77K,The CMR behaviour of the p-n junction is different from those of the LaMnO3 compound family.     

溶胶—凝胶法制备CH3SiO3／2—SiO2孤立膜

采用溶胶凝胶法,以２０％正硅酸乙酯／８０％甲基三乙氧基硅烷为先驱体,通过控制溶胶过程及选择合适的成膜参数,并以一种疏不性膜为可分离载体,制备得到了大尺寸的,厚度可达５０￣１０００μｍ的无支撑孤立膜。研究了制膜过程中正硅酸乙酯对抑制结晶沉淀及成膜行为的影响。采用ＡＦＭ观察了膜的表面形貌,采用ＸＲＤ对结晶沉淀进行了结构分析。     

B2分子A^3Σ^—u—X^3Σ^—g带系的Franck—Condon因子计算

计算了Ｂ２分子Ａ３Σ－ｕ－Ｘ３Σ－ｇ带系的Ｆｒａｎｃｋ－Ｃｏｎｄｏｎ因子。计算中计入了分子振转相互作用项，而且转动量子数的取值由Ｊ＝０取至Ｊ＝１８０。结果适用于低温，高温和强激波条件     

在N2中[VnCr3—n（μ3—O）（μ—O2CCH3）6（THF）3]X[n=0—3,X=Cl^—1,ClO4^—,（VO5）0.5^—]及[VnFe3—n（μ3—O）（μ—O2CCH3）6（THF）3]X（n=0—3,X=Cl^—1）

The reaction behavior of the title complexes have been investigated by means of in situ IR in nitrogen atmosphere. It has been found that they enabled the acetic acid to convert to acetone and methane in different temperatures. The results indicate that the sequence of the ketonization reaction activity for the clusters was [V3OAT] > [VFe2OAT], [V2CrOAT] > [Fe3OAT], [VCr2OAT] > [Cr3OAT] [OAT = (mu 3-O) (mu-O2CCH3)6 (THF)3], and the sequence of the methanation reaction activity for the clusters was [Cr3OAT] > [VCr2OAT], [V2CrOAT] > [V3OAT] > [VFe2OAT], [Fe2OAH]. The ketonization reaction activity of [Fe3OAT] were obviously lower than that of [Fe3OAH] [OAH = (mu 3-O) (mu-O2CCH3)6 (H2O)3] and the methanation reaction activity of [Cr3OAT] were also much lower than that of [Cr3OAH]. The difference between [Fe3OAH], [Cr3OAT] and [Fe3OAH], [Cr3OAH] mentioned above were discussed.     

THE 4—3—N MATRIX MULTI-CHANNEL SOUND SYSTEM

In this paper,it is proved that,although there are only three independent signals in a pano-ramic sound system,there can be different forms of each of the three channel signals to be selected.The general method of N(≥3)channel reproduction using the three independent signals and itsapplication as an example of N=8 are to be discussed.It may improve the reproduction effectof the conventional quadraphony. The use of this system in radio broadcasting and its compatibility with conventional systemare also discussed.     

氧化态K—MoO3／γ—Al2O3催化剂结构的EXAFS研究

对Ｎａ２ＭｏＯ４．２Ｈ２Ｏ，ＭｏＯ３，（ＮＨ４）６Ｍｏ７Ｏ２４．４Ｈ２Ｏ等结构典型的含钼化合物及氧化态Ｋ－ＭｏＯ３／γ－Ａｌ２Ｏ３催化剂样品进行了ＥＸＡＦＳ测试，并以Ｎａ２ＭｏＯ４．２Ｈ２Ｏ为标样进行多层拟合计算，以研究各样品钼组分的配位结构。     

Yb^3＋—Doped Non—π—Phase—Shifted distributed Feedback Fibre Lasers

Distributed feedback (DFB) fibre lasers usually have two longitudinal modes symmetrically located at each side of the Bragg wavelength because they have the same lowest gain threshold.In order to obtain single longitudinal output,π-phase-shifted DFB fibre lasers are often adopted.However,we found that,even with no π-phase-shift,the single frequency output can be acquired from Yb^3 -doped fibre DFB lasers.The polarization beat frequency was measured to be 366MHz.     

B_2O_3—Al_2O_3—PbO玻璃组成和物化性质的研究

本文研究了在B_2O_3—Al_2O_3—PbO玻璃中引入SiO_2、Sb_2O_3、Ga_2O_3后,TF光学玻璃化学稳定性及相对部分色散P_(g·F)。论证了B_2O_3—Al_2O_3—PbO光学玻璃光学性质、化学组成和结构关系。TF光学玻璃在3.51铂坩埚熔制。     

金属—Al2O3—硅结构湿度传感器

金属-Al2O3-硅结构(以下简称Si-MOS)电容型湿度传感器主要用于三个方面:微电子器件及IC气密封装内腔气相湿度的非破坏性检测;器件及IC封装工艺保护气氛湿度的在线监测;各种永久性气体中微量水分的连续监测.在物理研究中,还可对混合气相中的水分压进行连续检测. 微电子器件封壳内的水汽含量过高,会使器件或IC发生金属弥散、MOS反型、布线长毛分枝以及其他失效;估计因湿气过高所导致的失效要占器件总失效的50%以上.Si-MOS湿度传感器正是为了满足这种检测需要和控制工艺过程而发明的,因此具有重大的实用意义. 一般高可靠性器件的内腔体…