Advanced Materials Research Vols. 807-809

Abstract: By using a new kind of single-beam normalized photo-acoustic tomography spectroscopy (PAS-CT) technology with non-damage detection, the photo-acoustic tomography spectroscopy, optical absorption properties and photosynthetic pigment content of green and red leaves of Bischofia javanica were studied. The results show that: the photo-acoustic tomography spectroscopy of Bischofia javanica leaves could be obtained from different chopping frequency and different sample positions, and photosynthetic pigment content of their leaves is closely related to their photosynthetic intensity. The more photosynthetic pigment content the leaves of Bischofia javanica contain, the bigger optical absorption coefficient and the higher photosynthetic efficiency they have. The photosynthetic pigment content of the green leaves of Bischofia javanica is higher than that of the red ones. As a result, the photosynthesis of green leaves is better than that of the red ones. According to the results of our research, the photosynthetic efficiency of Bischofia javanica could be improved and its growth time could be effectively controlled to enhance the growth of Bischofia javanica. Furthermore, it could play an important role on the development of forestry, and meet the need of forest for 6 billion people. The research showed high science value to study and applications of the photosynthesis of plants.

Abstract: In order to solve the problem of environmental pollution caused by SO₂ steeping solution in the process of corn starch production, L-cysteine was used as reducing agent to break the combination of corn starch and protein. Corn sour slurry fermented by Lactobacillus paracasei was used as flocculating agent to accelerate sedimentation of corn starch. Corn was milled after steeping by corn sour slurry. Slurry was added L-Cysteine and stirred for 2h. Hydrosulphonyl content and starch mass was determined to study the effects of L-cysteine on the combination of corn starch and protein. Experimental results show that the effects on combination of corn starch and protein were great when L-cysteine content was 1%,acting temperature30°C, acting time4.2h, solution pH6.5.

Abstract: Cerium-doped todorokite was synthesized by refluxing process at atmospheric pressure, and the reaction conditions were investigated. The yielded products were characterized by X-ray diffraction (XRD). By according to the results, the stirring operation cannot be stopped during the preparation of birnessite, and the potential destruction to channel structure occurrs at high temperature. The form of todorokite is favorable under alkaline condition, but not affected by recycling time. The crystalline purity decreases with the rising doped cerium in the todorokite.

Abstract: In order to estimate the present exposure risk of Cadmium dietary intake by inhabitants in a W-Mo mining area, South China, a dietary investigation was conducted with stratified cluster random sampling method. According to the result, a total of 7 food groups, including rice, vegetable, meat, chicken and egg, were sampled from contaminated areas using the total dietary study method. Rice consumption took up 81.5% of food consumption. Cadmium content in 45.8% of 306 rice samples, 11.1% of 252 vegetable samples, and 4.8% of 21 chicken samples exceeded the limit. Risks of cadmium in study area are between 1.0E-06 and 1.0E-03, which is acceptable but need further attention to reduce them. Rice products were the highest contribution, which took up about 80.1%. The results showed that Cadmium intake was much higher around W-Mo ore deposit than that in reference area.

Abstract: According to the characteristics of coal mine dust extraction and its hazards and air pollution of the underground conditions, a detailed analysis of the major coal mine dust sources and dust distribution. For each proposed underground mining dust production source control measures. Management of coal mine dust and do a scientific outlook. Through the dust pollution control, improve coal miners operating environment to achieve cleaner production, reduce the incidence of occupational diseases miners, improve coal production and economic benefits.

Abstract: Modern chemical accidents may easily turn into environmental calamities, which can result in a number of social and public health problems. Therefore, environment, health and social issues caused by chemical process relevant incidents should be taken over in order to minimize the accident loss and not develop to the environmental pollution. Here the eight accident cases of the chemical produce are presented, and some improvements are provided on the basis of the analysis of the related chemical accidents, which could be helpful for the accident prevention, and environmental conservation and personnel protection.

Abstract: with a flat ground uranium tailings impoundment as the object of the paper, CFD technology was used to study the atmospheric dynamic diffusion characteristics and the evolution of time and space distribution of radon in the uranium tailings impoundment. Results show that, within 1500m range of the leeward of uranium tailings impoundment the falling gradient of radon mass fraction improves with distance increases at the same moment, however the falling gradient flattens with the increase of time gradually; During the first 30 minutes, the radon mass fraction of tailings impoundment in the leeward direction has a larger growth gradient, then flattens out slowly, and stabilizes after 75 minutes.

Abstract: A method is used to clean fruits combining ozone, calcium hypochlorite and cold water to In order to validate the sterilization effect, we counted, separated and purified the surface microbial numbers of the peaches and grapes before and after cleaning, The results showed that after cleaning the total numbers of bacteria and fungi in peaches reduced 98.7 percent and 98.4 percent, respectively. While the total numbers of bacteria and fungi in grapes reduced 75 percent and 85 percent, respectively. After cleaning, the fungi specie in peaches and grapes reduced 56 percent and 57 percent, while the bacteria species reduced 17 percent and 10 percent. As a result, this method can effectively sterilize the fruits.

Abstract: Light pollution is increasing recognized as having adverse effects on human and environment. This paper analyzes the sources and causes of the formation of light pollution, and explores the negative impacts of light pollution on ecological systems, human health and energy consumptions. At last, we propose some suggestions for the prevention of light pollution.

Abstract: Taking the China Academic Journal Network Publishing Database as a platform, we constructed a co-word matrix with the high-frequency keywords of ecological/environmental risk related papers published on core journals. We made multidimensional scaling analysis and cluster analysis using SPSS, and discussed the status of ecological risk related research. The results show that the research hotspots can be divided into five aspects, including ecological risk assessment on heavy metals in the bottom mud, ecological risk assessment of toxic organic pollutants, regional landscape ecological risk, environmental safety accidents and risk management, and other types of ecological risk such as transgenic and biological invasion.