ICP-AES法同时测定工业硅及多晶硅中铁、铝等六元素

主要研究了不同溶样方法及仪器条件。拟定了用聚四氟乙烯烧杯分解试样，采用ICP－AES法同时测定工业硅及多晶硅中铁、铝、钙、硼、砷、磷六个元素。测定结果能满足生产需要。     

抑制残留振动的三种整形器设计和鲁棒性分析

提出用z平面上极零相消概念设计整形器。可以避免求解复杂方程组。使用提出的方法对两模态柔性系统设计了三种整形器。振动抑制仿真显示。提出的方法对设计有强鲁棒性的ZVD和EI整形器是简便和有效的。     

甲苯、间二甲苯、邻二甲苯的柱效与分离度比较

利用甲苯、间二甲苯，邻二甲苯化合物的物理性质差异，以HP-1毛细管柱上的分离过程为探讨对象，对上述化合物的分离行为进行比较。实验表明：通过调节柱温和载气流量可获得较好的分离图谱。并可以用峰分离度指标来衡量。     

锝化学研究ⅩⅢ.~(99)Tc~m-配合物的溶剂化自由能与其脑吸收值的关系

利用G98W程序，采用Hartree-Fock方法和赝势基组LANL2DZ，首先在真空状态下对Tc－配合物进行构型优化，然后根据极化连续体模型（PCM）计算了Tc－配合物在水溶液和甲醇溶液中的溶剂化自由能。结果发现，其中CPCM模型和IEFPCM模型计算的^99Tc^m－配合物在溶液中的溶剂化自由能不仅可以更灵敏地反映其脂溶性的大小，而且是影响脑吸收值的重要因素。     

冶勒大坝地基卵砾石层（Q_3~（2－2）Ⅳ）帷幕灌浆初探

卵砾石地层中设置百米深度灌浆帷幕，国内首次，国外也少有。为探索治勒水电站大坝坝基及坝肩防渗设计和施工的技术问题，四川省电力局主持了在冶勒坝址石岸进行的帷幕灌浆试验。本文就已进行第四岩组灌浆情况，分析灌浆的可行性，并对下阶段在第三岩组地层进行试验工作提出一些新的设想。     

1H n.m.r. technique for characterization of polymerized petroleum pitches

A new proton n.m.r. technique has been developed for the chemical characterization of polymerized petroleum pitches with pyridine-insoluble contents as high as 80%. The polymerized pitches were completely solubilized for conventional ¹H n.m.r. evaluation in a mixed solvent system consisting of S₂Cl₂-SO₂Cl₂. Although solubilization occurs via the addition of chlorine to the polynuclear aromatic rings, the n.m.r. spectra can still be quantitatively interpreted. Several applications are discussed.     

塔式反应器连续合成5,5-二甲基海因材质选择及其耐腐蚀性研究

对 5 ,5 二甲基海因的连续合成方法中采用的塔式反应器及塔填料材质的选择及其耐腐蚀性进行了深入探讨。选取钛片、紫铜片、黄铜片、玻璃片、瓷质环、不锈钢片等六种材质分别浸泡于DMH合成反应后的母液中 ,定期考察它们的耐腐蚀性能。结果表明 :选用不锈钢作为塔材质 ,瓷质环作为塔填料效果较好 ,设备投资低。为工业化生产DMH的设备选材提供了可靠的数据。     

Studies of the stereospecific polymerization mechanism of propylene by a modified Ziegler-Natta catalyst based on 125 MHz 13C n.m.r. spectra

The mechanism of stereospecific polymerization of propylene (catalysed by a modified Ziegler-Natta system, TiCl₄/MgCl₂/C₆H₅COOC₂H₅/Al(C₂H₅)₃), has been analysed using the values of triad and pentad tacticity determined using 125 MHz ¹³C n.m.r. spectroscopy. The well-known single active-site models, such as the Bernoullian, first- and second-Markovian, and enantiomorphic models, were found to be inadequate to describe the observed tacticity. A two-sites model, in which at one site the stereospecific polymerization proceeds in obedience to the Bernoullian model and at the other proceeds under the control of enantiomorphic-site model, is proposed. It was found that the pentad tacticities of both soluble and insoluble (in boiling heptane) fractions of polypropylene agreed well with the two-sites model.     

Two-dimensional n.m.r. characterization of cycloaliphatic epoxy resins

The cycloaliphatic epoxy resins were studied by various two-dimensional nuclear magnetic resonance (2D n.m.r.) spectroscopies. The ¹³C n.m.r. spectra of the epoxy resins were assigned by using DEPT and 2D INADEQUATE techniques and the ¹H n.m.r. spectra were assigned by using 2D ¹H---¹H and ¹H---¹³C COSY techniques. Complete characterization of the samples synthesized by the oxidation of cyclohexene derivatives not only revealed the existence of the stereochemical isomers resulting from the structural difference of the oxide rings in the samples but also provided the composition ratio of the isomers.     

Analysis of polyaromatics in crude gas oil mixtures: a new strategy using H 2D n.m.r.

A new method for analysing complex mixtures, ¹H 2D n.m.r., was used to determine polyaromatics in crude gas oil mixtures. 2D NMR overcomes the lack of resolution due to crowded 1D spectra and provides structural information. In particular, TOCSY (total correlation spectroscopy) 2D n.m.r. is well suited to polyaromatics because these molecules give specific 2D fingerprints which can be easily recognized. These patterns were selected and analysed in two ways: (1) specific fingerprint recognition using a pure compound library; (2) using the mixing time τ_m of the TOCSY sequence. Variation of τ_m gives a change in cross-peak intensities. The intensity variation curves are characteristic of spin systems and hence of the structures of compounds. Alkylated substitutions were also studied. The compounds were quantified. This strategy was used to analyse crude gas oils and measure the contents of separated alkylated naphthalene isomers, biphenyls, anthracene, phenanthrene and benzothiophene.