Advanced Materials Research Vols. 726-731

Abstract: Based on fluid mechanics, the theory of gas-solid flow and jet theory etc. Dust migration regularity in fully mechanized workface was studied and simulated under far-pressing-near-suction ventilation with FLUENT Simulation technology. When the ratio of blowing to suction (μ) is larger than 1, the range of high dust concentration reduces and the maximum dust concentration decreases. The sketch of flow field of the different μ, the short of traditional far-pressing-near-suction ventilation and the superiority in practical of dust removal mode with the forced ventilation shunt were summarized and analyzed. The dust migration regularity in different shunt parameters (K) in this mode was simulated. Increasing shunted air quantities (Q) is beneficial to the control of dust diffusion in the roadway. But dust concentration near pressure air side will increase if the value of the shunted air quantities is over a critical value.

Abstract: Denaturing gradient gel electrophoresis (DGGE) analysis of 16S rRNA gene has been regarded as one of powerful tools for gaining insight into the bacterial diversity of intestinal system. In the present study, hyperlipidemia model was constructed in rat according to the tests of blood lipids. Fecal samples of rats were collected after 60d feeding, and DGGE was used to investigate the diversities of intestinal bacteria in the artificially-induced hyperlipidemia rats and normal rats. The results showed that two patterns had similarities, but there were also some different bacteria communities. Moreover, control group had much more bands than model group on gel, showing species in intestinal of model rats might be deduced by hyperlipidemia. It will be helpful to explore the relationship between hyperlipidemia and intestinal flora.

Abstract: With portable gas chromatography - mass spectrometry (GC - MS) each unit tested penicillin wastewater treatment system of volatile organic compounds (VOCs) from gas collection pipe. The results show that there are 29 pollutants in gas, including sulfur-containing compounds (90.37%). Large volume concentration H₂S (383 ppm), isopropyl mercaptan (30,432 ppb) and acetone (16,024 ppb); H₂S (766,000 times), isopropyl mercaptan (40576 times), methyl mercaptan (150 times) beyond their olfactory threshold; H₂S (383 times) beyond the TWA threshold. Each unit stench in the sum of the pollutant concentration is range of 47 ~ 2103 ppm. In waste water treatment system, anaerobic treatment unit stench is highest.

Abstract: With long-term mining and new orebodies proved to be in the deep, the dust concentration of each mine underground operation site increased sharply, which is a serious threat to safety and health of workers in workspace. In this paper, a high pressure spray technology was put forward for dedusting on a mine underground middle crushing station^[, and achieved the desired dedusting effect.

Abstract: The snow disaster is one of the main disasters in prairie pastoral areas of China. Once the snow disaster occurs, it will cause the death of a large amount of livestock due to the starvation and freezing weather. Therefore, it is especially important to forecast the risk of the snow disaster scientifically and reasonably. This paper established the snow disaster risk assessment index system firstly, and then established the snow disaster risk assessment model based on multi-layer fuzzy comprehensive evaluation. Finally, the massive experiment monitors and the contrast confirmation with the historical case data, showed that this model is practical and feasible, which conducted a useful attempt to further improve snow disaster risk assessment ability in pastoral areas.

Abstract: Firstly, this paper analyzes the features and development stages of sudden ecological crisis, and divides the process of emergency management into three stages. Then the paper puts forward a new kind of emergency management information system model which is based on data mining and WebGIS Technology. Finally, the paper studies the structure, function modules and operation flow of the system. This study is significant in improving the scientific and effective emergency management. It provides a useful reference for further system development.

Abstract: In the process of coal production in China, people's unsafe behaviour is the main factor in the system safety. Therefore, the key work in the safety management of coal mine enterprises is reducing or eliminating the unsafe behaviour of people. To solve the injury problems of coal mine enterprises and achieve intrinsic safety, we must carry out effective safety training and management so that employees can transform from the "want me to safety" to "I want safety", make safety management active in coal mine production and achieve fundamental safe production. How to train the ability of "independent safety" should be said that a new direction, the traditional way often emphasis on instilling knowledge and skills training. To stimulate employees' awareness of "I want safety" is still a difficult problem which has no system method and theory yet. This paper aims to study these questions and try to provide some new methods and ideas to improve coal mine safety training.

Abstract: The correlations of sediment characters[total organic content (TOC), particle size, soluble salt] with organochlorine pesticides (OCPs) in seven surface sediment samples of Nansi lake were discussed. Organochlorine pesticides(OCPs) in seven surface sediment samples of Nansi lake were analyzed by GC／ECD(Gas chromatography with electrochemical detection). The result showed that OCPs content was 2.9-6.91ng/g dw (dry weight).The concentrations of organochlorine pesticides (OCPs) failed to correlate with sediment characteristics (TOC, particle size and soluble salt).

Abstract: This paper analyzed the excess mortality change in nine districts of Nanjing city, based on mortality data and meteorological data from 2004 to 2010. Taken a typical heat waves process in summer of 2006 as an example, it was discussed of the effect of the heat process on different gender, different age groups , and various disease death toll and excess mortality changes. The excess mortality was associated with the average maximum temperature and average minimum temperature during the heat waves. Excess mortality occurred in the middle of June heat wave when excess mortality was much higher than in other time periods. In late June, early July to early August, the excess mortality is relatively small. The average daily deaths are increasing with increasing age for male and female, and every age death numbers is higher than that with no heat waves during the heat wave period. In addition to the respiratory system diseases, diseases of the genitourinary system, other diseases, residual disease in the heat waves has increased, and diseases of the nervous system and the endocrine system diseases of excess mortality rate reached a staggering 342.93% and 119.63%, accounting for almost half of the total heat excess mortality. The heat waves effect is very obvious. The conclusion is of great significance for prevention of high temperature heat harm.

Abstract: Mine into the deep mining, the power disaster occurs mechanism more complex features fuzzy disasters and hazards common. Outburst and rock burst and other disasters are common differences, the use of traditional coal seam outburst hazard identification method has limitations. According to the kilometers deep test area, the individual indicators law 13-1 coal seam the outburst hazard identification,13-1 coal seam first mining area were identified as non-prominent seam. While outburst identification test area seam burst tendency identification,13-1 coal seam has a strong burst tendentious. The test mine disaster prevention should also consider bumping prevention and control not only consider the gas control. Project research results have important reference conditions similar to mine.