东乡铜矿的环保综合治理

介绍东乡铜矿井下水的治理和综合利用、井下废石的处理以及选矿尾砂的综合应用 ,井下高温毒气的治理、尾矿坝的复土植被并继续为生产服务等环保综合治理情况。     

水相析晶点对乳化炸药稳定性的影响

文章采用对乳化炸药水相析晶点的测定方法，研究了制备乳化炸药的几种水相析晶点对其稳定性的影响t最后得出了相应的结论。结果表明乳化炸药水相析晶点越低，乳化炸药越稳定，基质水溶值也越小；经16次高低温循环，乳化炸药的殉爆距离仍达到20mm。     

提高选铜回收率的流程改造

在矿石性质和粒级分析的基础上 ,利用现有设施 ,进行流程改造 ,提高选铜回收率 ,为企业资源利用提供有利的依据     

永平铜矿网络工程的设计与实现

本文简略地介绍了企业局域网的设计与实现 ,以及网络系统的安全管理 ,并结合实际制定了具体的数据备份措施及恢复方案     

Analysis of the stabilization of hen lysozyme by helix macrodipole and charged side chain interaction

In the N-terminal region of the alpha-helix of the c-type lysozymes, two Asx residues exist at the 18th and 27th positions. Hen lysozyme has Asp18/Asn27 (18D/27N), and we prepared three mutant lysozymes, Asn18/Asn27 (18N/27N), Asn18/Asp27 (18N/27D), and Asp18/Asp27 (18D/27D). The stability of the wild-type (18D/27N) lysozyme supported the existence of a hydrogen bond between the side chain of Asp18 and the amide group at the N1 position in the alpha-helix, while the stability of the 18N/27D lysozyme supported the presence of the capping box between the Ser24 (N-cap) and Asp27 residues. Although electrostatic repulsion was observed between Asp18 and Asp27 residues in 18D/27D lysozyme, the dissociation of each residue contributed to stabilizing the B-helix in 18D/27D lysozyme through hydrogen bonding and charge-helix macrodipole interaction. This is the first evidence that two neighboring negative charges at the N-terminus of the helix both increased the stability of the protein.     

精制盐代替原盐生产煤矿许用铵梯炸药

文中以精制盐加工工艺理论为指导，进行了精制盐代原盐，取消原盐焙烧制造煤矿许用铵梯炸药的尝试。精制盐替代原盐具有降低材料成本，概治环境污染，简化工艺过程，提高炸药组分初检合格率等优点。     

回路阻抗变化影响电能计量准确性

文章从理论上分析讨论测量回路阻抗变化对三相三线电度表电能计量准确性的影响 ,指出了在实际运行中只有平时加强维护管理 ,尽量保持测量回路的阻抗值对称与稳定 ,使电流互感器二次侧的相位角与一次侧的相位角保持一致 ,才能有效保证电能计量的准确性     

小型冶金矿山节电途径浅析

通过对金牛矿业公司近几年来的节电途径的总结和分析，介绍了小型冶金矿山一些行之有效的节电方法和途径，具有一定的借鉴价值。     

Preparation of long sticky ends for universal ligation-independent cloning: Sequential T4 DNA polymerase treatments

Ligation-independent cloning (LIC) is a useful method for efficient directional cloning of a PCR product. LIC requires a specially designed vector containing a long stretch of sequence that is missing any one of the four nucleotides. When the linearized vector is treated with T4 DNA polymerase, in the presence of the absent base, long single-stranded overhangs are generated that are suitable for cloning. In this study, long and efficient sticky ends for LIC were produced by sequential T4 DNA polymerase treatments at non-specific sequences on a commercially available vector. All restriction enzyme sites become available in the current LIC.     

有源扩散方程的一种解和“双滤纸法”测氢的换算公式

文章从流速场中级联衰变下气载核素的扩散规律出发,提出了强吸附性壁圆管内氡子体扩散方程的完整定解问题,求出了等速分布廓线时的方程的精密解,弥补了C.W.Tan这部分工作的不足。引进了新的物理量m(μ),导出了等速分布条件下m(μ)与F(μ)的互换关系式。从测量氡子体的α计数出发,通过放射性平衡比m(μ)给出了“双滤膜法”测氡的换算公式。由J·W·Thomas的精密实验数据,取镭-A扩散系数D=0.07cm~2·s~(-1)时,理论与实验十分吻合。