计算机图形学的教学实践及在煤矿安全中的应用

计算机图形学主要是研究用计算机及图形设备输入、表示、变换、运算和输出图形的原理、算法及系统。在教学、实验及应用中有独特的特点。该文建议在教学中,将该课程分为知识案例教学、案例实验、系统学习、课程设计、应用系统开发和综合训练模块,合理组织教学内容。在授课过程中使用概念图技术,建立可视化教学模型,将其落实到教学实践后,收到了良好的效果,使课程更加形象、生动、具体,调动了学生学习的主动性和积极性。该课程可与煤矿的安全生产管理相结合后,在煤矿的生产系统设计、火灾和瓦斯爆炸、安全教育和技术培训等方面应用,可以提高组织、指挥、协调和控制效率,可有效提高煤矿生产安全及管理水平。     

城市生活垃圾智能分类技术研究与应用进展

城市生活垃圾清运量逐年增加,由此带来的环境问题日益严峻.不同垃圾组分有其各自适宜的处理与利用方式,因此,有效的垃圾分类技术具有重要意义.我国现有的以人工为主的垃圾分类方式存在效率低、成本高、准确性差等弊端,而垃圾智能分类技术是解决相关瓶颈的重要手段.本文简述了中国代表性城市生活垃圾分布和近年变化趋势,从密度、电、磁、声...     

Recycle of bio-waste banana and sisal fiber filled harmlessness epoxy hybrid composite for automotive roof application

Insists of polymer matrix composite is prepared by using natural fiber facilitates high tensile, flexural, and impact toughness properties. The natural fiber utilization in the polymer matrix can overcome the synthetic fiber demerits of poor compatibility, high moisture absorption, and high cost. The present research investigates developing a low-cost, environmentally eco-friendly epoxy hybrid composite using different volume percentages of chopped natural waste banana (0Vol%, 5Vol%, 10Vol%, and 15Vol%) and sisal fiber (0Vol%, 15Vol%, 10Vol%, and 5Vol%) through hand mould hot compression technique. The presence of natural waste banana and sisal fiber on tensile strength, flexural strength, and thermal adsorption properties of the epoxy hybrid composite are evaluated by ASTM test standards. The ASTM standard measured test results of epoxy hybrid composite with and without natural waste banana and sisal fiber were compared and sample three was identified by good tensile strength, flexural strength, and better thermal adsorption properties compared to all others. The sample three epoxy hybrid sample is recommended for automotive roof application.     

The potential of remote sensing data for decision makers at the state, local and tribal level: experiences from NASA’s Synergy program

NASA’s Earth Observation System (EOS) satellite data are contributing to the development of policy relevant, remote sensing applications. To promote the use of EOS data for application development, NASA funded the Synergy program in 2000 in partnership with academia, end users, and industry. Three examples of remote sensing applications from the Synergy program are presented here and include agriculture, range management, and water resource management. These examples show that remote sensing products have the potential to be useful to a variety of decision makers and policy makers because of the opportunity to reduce chemicals in the environment, improve crop yields and better manage range lands and water resources. Transitioning from research and development to successful applications must overcome challenges such as the lack of awareness by end users of these technologies, inadequate feedback mechanism between application developers and end users, and unproven cost benefits of remote sensing data. Experience from the Synergy program indicates that these issues could be mitigated by educating and training end users, demonstrating the utility of remote sensing data in improving decision making, and establishing and maintaining a continuous dialogue between developers and end users. Sustainability of remote sensing applications ultimately depends on users continuing reliance on products and benefits from remote sensing data. The Synergy program also demonstrates that remote sensing data sets that are collected primarily for global change research contribute to the development of applications in a variety of disciplines at the regional and local level.     

太铜热连轧水处理泥系列改造新工艺

新工艺引入"一机两用"和"以废治废"的思想进行系统改造,实现改造后污泥处理系统的良性循环,根除了污泥外排的局面,降低了成本,节约了费用,创造了良好的社会效益和环境效益.     

热重分析(TG)与质谱分析(MS)联用技术在环境领域应用前景分析

简要介绍了热分析技术发展的一个重要方向--热重-质谱联用技术(TG-MS),在阐述TG-MS的发展历史和联用技术的基础上介绍了国内外科学家利用TG-MS技术在环境保护领域取得的研究成果,并展望了该技术的应用前景.     

Monitoring and assessment of toxic metals in Gulf War oil spill contaminated soil using laser-induced breakdown spectroscopy

Laser-induced breakdown spectroscopy (LIBS) was applied for the detection of toxic metals in oil spill contaminated soil (OSCS). The OSCS samples were collected from Khursania Saudi Arabia along the coast of Persian Gulf exposed to oil spills in 1991 Gulf war. Environmentally important elements like Aluminum Magnesium, Calcium, Chromium, Titanium, Strontium, Iron, Barium, Sodium, potassium, Zirconium and Vanadium from the contaminated soil have been detected. Optimal experimental conditions for analysis were investigated. The LIBS system was calibrated using standard samples containing these trace elements. The results obtained using Laser-Induced Breakdown Spectroscopy (LIBS) were compared with the results obtained using Inductively Coupled Plasma Emission Spectroscopy (ICP). The concentrations of some elements (Ba and Cr) were found higher than permissible safe limits. Health risks associated with exposure to such toxic elements are also discussed.     

Landmarks’ use in speech map navigation tasks

Tools for assisting human navigation, especially in-vehicle systems, have been extensively investigated. However, few studies have explored the design of speech-based over-the-phone guidance systems. This study examined the effect of landmarks' use and the effect of landmarks’ frames of reference in route instructions on navigation efficiency during map navigation tasks and satisfaction. Twenty-seven participants performed map navigation tasks using a simulated speech navigation system in three experimental conditions: instructions containing no landmarks, instructions containing landmarks located without reference to either the traveler’s body or the surrounding environment, and instructions containing landmarks located with respect to the traveler’s body. Navigation performances on maps were higher and landmarks enable participants to make fewer directional errors and find their routes more efficiently. Satisfaction levels and navigation performances were lower when instructions did not contain any landmarks. Landmarks’ frames of reference shifting turned out to be different between human-human situations previously used and human-computer situations used here.     

Dermal exposure to pesticides in greenhouses workers: discrimination and selection of variables for the design of monitoring programs

Dermal exposure to pesticides is one of the main sanitaryproblems which greenhouses workers face. With the dual aimsof establishing both the body part that receives the greatestexposure and the variable that has greatest influence on this exposure level, 22 pesticide application trials were performed. Trials were carried out in different greenhouse vegetable crops,using different pesticides and different spray diameters from the spray gun. In order to determine dermal exposure, the wholebody method was used. Pieces of the applicator suit were subject to an extraction procedure and their pesticide contentdetermined using GC-NPD analysis. Multivariate analysis were applied to the data obtained. Principal component analysis showed that all trials produced a high exposure level on lowerleft leg and lower right leg. Cluster analysis distinguished between three sample groups. The most and the least affectedparts were clearly distinguished. Discriminant analysis indicated that the thin drop size of the spray gun is responsible for both the differences between groups and the minimum or maximum exposure level measured on the applicatorsuit. Therefore, selecting the variables, lower legs and thindrop size, is considered fundamental in designing programs formonitoring pesticide exposure.     

固相微萃取涂层的研究进展

固相微萃取是一种新型的样品前处理技术.萃取头涂层是固相微萃取的核心,涂层的性质对萃取的选择性和灵敏度起着决定性作用,综述了固相微萃取涂层的发展及其应用.