江西省相山铀矿田成矿条件探讨

本文主要阐述了相山铀矿田的成矿条件。相山铀矿田是我国最大的火山岩型铀矿田,研究其成矿条件对今后找矿工作有十分重要的意义。本文主要从构造背景、物质条件、断裂构造和保矿条件这几方面进行探讨。     

Research Note: Inactivation Efficiency of Ozonated Water for Fusarium oxysporum Conidia Under Hydroponic Greenhouse Conditions

Ozonated water was used for inactivation of Fusarium oxysporum conidia in sterilized water and inorganic soil-less nutrient medium at different treatment temperatures. F. oxysporum conidia were effectively inactivated in both water and nutrient media and the inactivation curves were almost same at 15°C, 25°C and 30°C. Approximate 4-log orders of F. oxysporum conidia were killed when the ozonated water with initial ozone concentration of 1.0 ppm had been used. The surviving curves, however, were characterized by a tailing-off effect, and the effect was related to the residual ozone concentration in the ozone treated suspensions.     

工艺参数对沉降斑影响的实验研究

采用实验方法考察工艺参数对沉降斑的影响。基于一个带凸台的平板模具,采用L27(313)正交矩阵进行实验,研究了几何尺寸、熔体温度、注射时间、保压压力及保压时间对厚度突变处沉降斑形成的影响,同时还考虑了熔体温度和注射时间以及保压压力和注射时间之间的交互作用影响;通过性噪比分析和F检验优化成型工艺条件并对工艺参数的影响进行显著性分析。结果表明,对于厚度突变的平板制品,厚度突变的程度对其沉降斑形成的影响最大,其次为熔体温度,保压压力,保压时间等;采取减小厚度变化,降低熔体温度或增加保压压力和保压时间等措施,可以减小厚度突变处沉降斑,从而减少其对外观质量的影响;因素之间的交互作用对制品沉降斑的形成有一定的影响,熔体温度B和注射时间C之间的交互作用影响较为明显,而保压压力D和注射时间C之间的交互作用对该质量指标的影响最小,可以并入误差。     

“Practical Difficulties associated with the Electrodeposition of Chromium”

Nickel coatings can be completely removed from steel articles without appreciable attack on the steel by anodic treatment in 50 per cent. (by volume) sulphuric acid solution with an applied potential not exceeding 2·0 volt.

The method is suitable for the removal of thick nickel coatings as an alternative to machining, which is expensive and removes some steel. It can also be used to determine the average thickness of nickel or of composite nickel-copper coatings on el by loss in weight.     

Estimation of number of surface crystals on sodium fluoride mother crystal in crystallization

A simple model was developed to explain the surface crystals found on the clear mother crystal face. The surface crystals on the mother crystal in the reaction crystallization of sodium were mathematically estimated by using a model based on two-dimensional secondary nucleation and two-step growth mechanisms. The model predicted that the surface crystals found on the mother crystal would be sensitive to the reactant concentration and agitation speed due to their influence on the interfacial supersaturation in the crystal growth. As the bulk supersaturation increased and the molecular transport was facilitated, the number of surface crystals on the mother crystal also increased, because the interfacial supersaturation built up on the mother crystal surface was enhanced. The prediction of the number of the surface crystals on the mother crystal appeared to be consistently comparable with experimental results.     

多雨季节施工工程的质量控制

本文从若干方面说明雨季施工的不利条件对工程质量的影响。对于如何落实雨季施工措施提出意见。     

风水理念在园林设计中的应用

如今园林设计要综合考虑很多方面，风水是其中一个重要因素，关乎园林规划的合理性，甚至会涉及到吉凶问题，应当引起重视，并加强相关理论研究。本文先对风水理论及其基本原则做了简单介绍，然后从选址立基、景观设计、植物配置三方面分析了风水理念的实际应用。     

380v直接接入式三相三线电能表的计量误差分析

针对电网中380v三相四线供电低压用户还存在用三相三线电能表的情况,对380v系统直接接入式三相三线电能表用在三相四线系统中的各种运行工况的计量误差分析。从理论上分析包括各种单相负荷、两相负荷、三相负荷情况的误差,得出量化的误差数值,以此引起供电部门重视,促使违反规程使用三相三线电能表计量三相四线系统电能的情况进行整改。此分析对追补电量的计算亦有一定的参考价值。     

无规共聚聚丙烯管力学性能影响因素的研究

采用挤出成型生产出无规共聚聚丙烯管材,讨论了塑化温度、螺杆转速和冷却水温度等挤出成型工艺条件对无规共聚聚内烯管材力学性能的影响.结果表明:当平均塑化温度为210 ℃、螺杆转速为40～45 r/min、冷却水温度为20～30℃时,无规共聚聚丙烯管材具有较理想的力学性能.