煤的毕业论文范文英文

With the rapid development of China's economy, the traditional coal energy demand is increasing. But most of China's coal mines are underground, high concentrations of gas, mining more difficult, technical requirements, in the slightest mistake in the mining process, it could trigger a major accident, a gas explosion in China coal mine safety has become the "first Killer. " Therefore, the coal mine gas concentration in real-time monitoring of particular importance. The subject of gas through the gas monitoring mechanism analysis, to Visual Basic for development tools, using C / S software development model, the establishment of SQL Server2000 database as a platform for gas monitoring system. The system's design and development process, giving full consideration to the mine gas monitoring the needs of gas, the gas concentration to achieve real-time data collection, database management and gas to the monitoring data processing. And to achieve a gas monitoring information on a monthly, quarterly and annual actual changes in the display interface and data statements, according to data collected by the gas to map out changes in the trend curve, the unusual situation of the data generated warning. Related personnel can grasp the system time to change the concentration of gas underground, mine gas against the defense work to provide strong technical support.

Coal is our country important foundation energy, the natural resources in our country, coal occupies an important position in the primary energy. So how to make the mining underground coal resources fully, to achieve the best utilization of resources is an important research subject. At the same time, under the condition of the existing mining technology and occurrence of coal geological conditions, underground mining will inevitably affect the overburden and surface engineering facilities. In order to reduce and avoid the harmful effects of underground mining, the effective prevention and protection measures must be taken. The design of coal pillar is one of the important measures., is mainly introduced in this paper the principle of design, coal pillar, the pillar design, the various methods and the use of office software and VB language object oriented visual features in the application of design system, through actual examples, results are the process of system implementation, emphatically discusses the method of VB technology in realizing vertical system design by pillar,And expounds the relative key techniques and implementation methods, studies the development pattern, process, application design to the overall frame of system, solve the tedious calculation problem of ideal visual display solutions.

The current,Rural home appliance logistics mode,High logistics cost,Logistics enterprise profits narrow space,To improve the rural home appliance logistics mode,Investment is too big, exciting and step back, this vicious cycle makes the logistics enterprises remain focused on rural household appliance market, but has not decided to develop the rural. In this context, Yueyang rural home appliance logistics is from without, from the city node to cover rural areas, has got great development, but there are still a lot of is too big, exciting and step back, this vicious cycle makes the logistics enterprises remain focused on rural household appliance market, but has not decided to develop the rural. In this context, Yueyang rural home appliance logistics is from without, from the city node to cover rural areas, has got great development, but there are still a lot of problems.希望能解决您的问题。