高炉探尺全数字直流调速系统

介绍了全数字直流调速装置SIMOREGK6RA24在高炉探尺系统中的运用，该系统具有控制精度高，组态方便，调试简单，故障率低等优点。     

关于对称左部集的性质及相关理论研究

本文给出了对称左部集的性质：Ta，Tb，Tc，讨论了对称左部集Eki同时满足这三个性质的条件和相应的算法。     

微生物发酵生产纤溶酶的研究

以一株具有高产纤溶酶能力的菌株中国根霉１２＃为出发菌株，以麸皮、胰蛋白胨为培养基，采用液体发酵法生产一种高效血栓溶解酶。用人工血纤维蛋白平板检测其活性。对培养基中的碳源、氮源、浓度及配比进行了研究，通过正交试验设计了最佳培养基配方和培养条件，并进行了扩大培养实验     

天然甲壳素的制取与开发技术

文章详细介绍了甲壳素的制备方法，主要性质及应用开发技术。     

中高碳钢堆焊技术的应用及研究进展

介绍了近年来堆焊技术在中高碳钢的应用和堆焊焊条的研制进展情况。     

Thymidine kinase gene mutation leads to reduced virulence of pseudorabies virus

To explore correlation between the tk gene structure of pseudorabies virus (PRV) and its virulence, to study the effect of the gene mutation on PRV biological properties, and to investigate mechinism of reduced virulence, thymidine kinase (TK)-deficient mutant of pseudorabies virus strain Hubei (PRV HB) was isolated by selection for resistance to 5-bromodeoxyuridine. The tk genes of PRV HB and its TK^― mutant were cloned and sequenced. 1587 base pairs of the tk gene and flanking regions of wild-type (wt) virus were sequenced, which included an open reading frame (ORF) of 1098 bp encoding a protein of 366 amino acids. The ORF contained two 137-bp repeated sequences, which were connected by an adenosine. 1458 bp of the tk and flanking regions of TK^― mutant were sequenced. Analysis of the tk gene sequence of TK^― mutant indicated that one of 137 bp repeated sequence and the connecting adenosine in the tk gene of the wt virus was deleted and a repeated sequence of 8 nucleotides (GCGCGCC) was inserted. All other nucleotides of TK^―mutant were identical to that of wt virus. Deletion and insertion of the nucleotide sequence resulted in a frameshift and a premature chain termination, and the resultant TK protein was not active. Analysis of the amino acid sequence revealed that TK protein of PRV HB contained the conserved consensus sequence of herpesviral TKs and an additional conserved-DHR-motif. The results of this work also indicated that TK^― mutant was genetically stable. Compared to PRV HB, virulence of TK^― mutant was greatly decreased. Mice vaccinated with TK^― mutant were completely protected against a lethal challenge with virulent PRV (HB).     

Photoluminescence from Ge-SiO2 thin films and its mechanism

Ge-SiO₂ thin films were deposited on p-type Si substrates using the radio frequency (rf) magnetron sputtering technique with a Ge-SiO₂ composite target. Films were annealed in N₂ ambience for 30 min at 300℃—1000℃ with an interval of 100℃. Through the X-ray diffraction, the average size of Ge nanocrystals (nc-Ge) was determined. They increased from 3.9 to 6.1 nm with increasing annealing temperature in the range of 600℃—1000℃. Under ultraviolet excitation, all samples emit a strong violet band centered at 396 nm. With the formation of nc-Ge, the samples exhibit another emission of orange band with the peak at 580 nm and its intensity increases with the increasing size of nc-Ge. The peak positions of two bands do not shift obviously. Experimental data indicate that the violet band comes from GeO defect and the orange band originates mainly from the luminescence centers at the interface between the nc-Ge and SiO₂ matrix.     

Bi2CuO4的氧渗透和高温电导性能研究

通过固相烧结法制备了Bi2 CuO4材料 ,并对其在中高温下的电导性能及氧渗透性能进行了研究 .研究表明 ,Bi2 CuO4在 70 0℃以下时为电子导体 ,而在 70 0℃以上时其离子电导随温度的增加而显著的增加 ,在 780℃左右时与其电子电导相当 ,是一种较好的氧离子 电子混合导体 .氧渗透测量表明 :在 786℃时 ,厚度为 1 .72mm的样品在上表面氧分压为 0 .2 0 9atm ,下表面氧分压为 0 .0 0 6atm时的氧渗透率达到 5.93×1 0 -8mol/scm2 .     

改革教育评价制度推进滇西乡村小学素质教育——弥渡、祥云县乡村小学教育现状调查与分析

以祥云、弥渡县部分乡村小学为调查对象,发现滇西乡村小学存在师资队伍、教育设施、教育评价制度等方面的典型问题急待解决。为此,从课程开设、师资队伍建设、基础设施的增添与使用、地方课程资源的开发、教育部门领导的培训与管理、地方教育评价制度的改革等六个方面提出了推进滇西乡村小学素质教育的相应建议。     

非水电位滴定法测定混合芳胺中各组分含量

本文用非水电位滴定法测定了三元混合芳胺中各组分含量，测定结果的相对标准偏差为2．09％～3.97％，回收率为99．5％～102％。该法设备简单，操作方便，测定准确，选择性好。对二元混合芳胺中各组分含量也可用同样的方法测定。