烟草野火病研究概况

本文从地理分布、经济损失、症状、寄主范围、病原学、流行学和防治学方面对烟草野火病的研究概况进行了综述。      

The effect of blowing agent choice on energy use and global warming impact of a refrigerator

A study, comparing the effect of blowing agent selection on energy consumption and the life cycle climate performance (LCCP) of a typical European refrigerator is discussed. Energy consumption of prototype European-style refrigerators made with a foam formulation with HFC-245fa as the blowing agent was measured and compared with energy consumption of the same model as currently produced (using a foam with a pentane blend for the blowing agent). Results were used in a LCCP study, considering both direct and indirect climate impacts due to blowing agent emissions and energy consumption in manufacturing processes and over the life cycle of the refrigerator. An assumption is made that the refrigerator is built and used in the European market.     

Thermodynamic evaluation of new absorbent mixtures of lithium bromide and organic salts for absorption refrigeration machines

Mixtures of lithium bromide and organic salts of sodium and potassium (formate, acetate and lactate) have been evaluated as alternative absorbents for absorption refrigeration machines. The main objective is to overpass the limitations of lithium bromide and improve the characteristics and the efficiency of the refrigeration cycle. In order to select the mixture that presents better properties for its employment in absorption refrigeration cycles, a thermodynamic analysis have been done. Density, viscosity, enthalpies of dilution, solubility and vapour pressure data of the proposed mixtures have been measured. A simulation program has been developed to evaluate temperatures, heats exchanged in the different sections and the efficiency of the cycle.     

钻柱应力波频谱分析技术的应用

钻柱应力波频谱分析技术是一个崭新的技术领域。该文针对石油钻井中在线识别钻头工况和地层岩性的客观需要,叙述了钻柱应力波的成因、其各频段的特征、应力波各频段信息的分离技术、以及频谱技术在石油工程中的应用。着重阐述了频谱高频段岩性信息的分离技术,提供了一个能量归一化公式,对井深、井径和钻进措施等干扰因素进行了分析和排除,并给出了用人工神经网络识别岩性的初步方法。     

BIM+无人机航测技术的房建工程应用研究

建筑业作为在我国国民经济中占据重要地位的传统行业,其建筑施工周期长,资源消耗量大。将无人机应用在建筑业,既能提高工程施工质量、加快施工进度,也能融入BIM技术从而提升项目管理效率,实现对项目的管控。本文结合房建工程应用,对无人机选型、测具选型、飞控软件选型以及基于BIM数据处理软件选型进行分析,探索BIM+无人机应用标准化的适用性路径。同时,将无人机航测技术与BIM技术结合,把实体模型与虚拟模型拟合,记录施工建造的全过程,解决土方算量及进度模拟等问题,辅助项目高效、精准施工。     

铁路某采空区变形测量技术方案探讨

结合太中银铁路山西境内某采空区的变形测量工作,对铁路建设中采空区变形测量特点、等级、变形网及变形观测点的布设方法、测量周期的确定、外业观测、数据处理等进行了探讨。     

A survey of tap water quality in Kuala Lumpur

A safe drinking water programme known as The National Drinking Water Quality Surveillance Programme (NDWQSP) was launched by the Ministry of Health, Government of Malaysia in 1983 to ensure safe practices in water treatment and distribution. The aim of this work was to assess the effectiveness of this programme in the improvement of tap water quality in and around Kuala Lumpur. The results indicate that there was no microbial contamination in 100 random samples collected from 20 selected areas. Other quality parameters such as colour, pH, turbidity, hardness, magnesium, sulphate and chloride were within acceptable limits. Heavy metals such as Cu²⁺, Pb²⁺, Cr (total), Ni²⁺, Cd²⁺, Fe (total) and Mn (total) were also under control. The only exception was Ba²⁺, which did not comply with the standard and was up to ten times higher than the guideline value. Moreover, there was significant variation in water quality as indicated by the test results.     

电力勘测设计行业CAD电子文件的管理和利用

根据国家标准《CAD电子文件光盘存储、归档与档案管理要求》,针对电力勘测设计单位CAD电子文件的实际管理和利用情况,对CAD电子文件的收集、整理、鉴定、归档、管理和利用的全过程管理进行了阐述。     

Critical Success Factors for New Product Development in Biotechnology Companies

The development of new products has become increasingly critical for the competitiveness of companies, due to increased diversity and variety of products, the reduction of product life cycles, and, primarily, globalization of markets. Thus, the identification and prioritization of critical success factors for developing new products is important, particularly for the high degree of risk and uncertainty involved. The main objective of this article is the identification and prioritization of critical success factors in new product development projects in biotechnology companies in the state of Minas Gerais, Brazil. The research method used was a survey questionnaire, which was sent to a sample of 31 biotechnology companies in Minas Gerais state. The principal findings of this research are that interpersonal skills/relationships of the project leader and technical skills are the most critical factors for successful new product development in this industry. The implications for the biotechnology industry in general, as well as for those responsible for managing new product development, are discussed.