Study on the cementitiousness of asbestos tailings

ＳｔｕｄｙｏｎｔｈｅｃｅｍｅｎｔｉｔｉｏｕｓｎｅｓｏｆａｓｂｅｓｔｏｓｔａｉｌｉｎｇｓＬｕＺｈｏｎｇｙｕａｎ，ＨｕｏＪｉｃｈｕａｎ，ＬｉａｏＱｉｌｏｎｇ，ＸｉｏｎｇＹｉｍｏｕＳｏｕｔｈｗｅｓｔＩｎｓｔｉｔｕｔｅｏｆＴｅｃｈｎｏｌｏｇｙ，Ｍｉａ...     

Simulating study on the effect of acid precipitation on forest soil weathering

The effect of acid rain on the forest soils in China was discussed on the basis of simulating studies. The soils were collected from five typical areas, including Chongqing in Sichuan Province and Guiyang in Guizhou Province, where there has been heavier acid rain in southwest China, and Huitong in Hunan Province, Zhouzhi in Shaanxi Province, and Xinglong in Hebei Province, all of which were selected as control. Field investigation and sampling were made in the typical forests in all the above five areas. The relationship between pH values in precipitation and rates of soil weathering, the difference between the rates of soil weathering in different areas, and the cause of such a difference, have been worked out. The prediction was also conducted on the supply dynamics of nutrient and toxic elements in various forest ecosystems which were affected by acid deposition in order to understand the long-term effects of acid precipitation on the forest ecosystems studied.     

Study on the water quality of the Taihu Lake using geonotoxicological methods

--The micronucleus(MCN) test of Vicia faba root tip cell     

Study on the decolorization of dyes by microorganisms

Thirteen strains of bacteria with ability of dye decolonization were isolated from activated sludge and biofilm collected from textile wastewater treatment plants, and identified as Alteromonas, Klebsiella, Pseudomonas, Enterobacter. Alcali-genes and Corynobacterium. These strains D33, D32, D4 of Alteromonas can decolorize 29 kinds of dyes with good decolorizing activities of about 2.6 mg dye/gram wet cells.h-1. The optimum pH was 7-8 and the temperature was 37℃. The growth of bacteria was 3 times better in shaking cultures than in static cultures. But the decolorization rate of dyes was 4-9 times more in the latter than in the former. The results from the examination of the reaction products of Diamond Chrome Red B and Diamond Narry Blue RRN indicated the possibility of biodegradation of these dyes by Enterobacter D17.     

Study on the water quality of the Taihu Lake using genotoxicological methods

ＳｔｕｄｙｏｎｔｈｅｗａｔｅｒｑｕａｌｉｔｙｏｆｔｈｅＴａｉｈｕＬａｋｅｕｓｉｎｇｇｅｎｏｔｏｘｉｃｏｌｏｇｉｃａｌｍｅｔｈｏｄｓＷｕＱｉｎｇｌｏｎｇ，ＣｈｅｎＫａｉｎｉｎｇＮａｎｊｉｎｇＩｎｓｔｉｔｕｔｅｏｆＧｅｏｇｒａｐｈｙａｎｄＬｉｍｎｏｌ...     

On the influence of sand-wind on atmospheric environment

The authors seek, through tests on simulated sand samples in a wind tunnel and analysis of minerals combination and trace elements, to discover the environmental implications of flying-up, falling-down and concentration variation as a function of natural wind speed and direction, distance of movement, range and extent of influence on the atmospheric environment, of micro-granular components on the ground surface in the Keerqin desert area in northwest Liaoning Province of China.     

Sensitized effect of β-cyclodextrin on the fluorescence in the determination of carbaryl

Based on the significant enhancement of fluorescence intensity of carbaryl in inclusion complex, a spetrofluorimetric method with high sensitivity was developed for the determination of carbaryl in aqueous solution. Under the optimum conditions, the complex had excitation and emission maxima at 278 nm and 332 nm, respectively. The linear range of the method was 7.0 ng/ml-1500 ng/ml with a detection limit of 1.2 ng/ml. The proposed method was successfully used to determine quantitatively of carbaryl in cottonseeds.     

Quantitative structure - activity study on the reductivedehalogenation potency of the halogenated aromatics

Ｑｕａｎｔｉｔａｔｉｖｅｓｔｒｕｃｔｕｒｅ－ａｃｔｉｖｉｔｙｓｔｕｄｙｏｎｔｈｅｒｅｄｕｃｔｉｖｅｄｅｈａｌｏｇｅｎａｔｉｏｎｐｏｔｅｎｃｙｏｆｔｈｅｈａｌｏｇｅｎａｔｅｄａｒｏｍａｔｉｃｓＨｕａｎｇＱｉｎｇｇｕｏ；ＷａｎｇＬｉａｎｓｈｅｎｇ；Ｈａｎ...     

Sensitized effect of β-cyclodextrin on the fluorescence in the determination of carbaryl

Based on the significant enhancement of fluorescence intensity of carbaryl in inclusion complex, a spetrofluorimetdc method with high sensitivity was developed for the determination of carbaryl in aqueous solution. Under the optimum conditions, the complex had excitation and emission maxima at 278 nm and 332 nm, respectively. The linear range of the method was 7.0 ng/ml-1500 ng/ml with a detection limit of 1.2 ng/ml. The proposed method was successfully used to determine quantitativelv of carbarvl in cottonseeds.     

Study on the oasis corridor landscape in the arid regions based on RS and GIS methods--application of Jinta Oasis, China

ＩｎｔｒｏｄｕｃｔｉｏｎＴｏｂｅｂｒｉｅｆ,ｃｏｒｒｉｄｏｒｉｓｔｈｅｌｏｎｇａｎｄｎａｒｒｏｗｂｅｌｔｗｈｉｃｈｉｓｄｉｆｆｒｅｎｔｗｉｔｈｂｏｔｈｓｉｄｅｓ’ｍａｔｒｉｘ .Ａｌｍｏｓｔａｌｌｔｈｅｌａｎｄｓｃａｐｅｓａｒｅｃｕｔａｐａｒｔａｎｄａｌｓｏｃｏｎｎｅｃｔｅｄｂｙｔｈｅｃｏｒｒｉｄｏｒｓ.Ｔｈｅｓｅｄｏｕｂｌｅｂｕｔｏｐｐｏｓｉｔｅｃｈａｒａｃｔｅｒｉｓｔｉｃｓｓｈｏｗｔｈｅｉｍｐｏｒｔａｎｔｆｕｃｔｉｏｎｏｆｔｈｅｃｏｒｒｉｄｏｒｓｆｏｒｔｈｅｌａｎｄｓｃａｐｅ .Ｔｈｅｃｏｒｒｉｄ…     

A study on the hydraulics of waste stabilization pond

In this study, tracer tests and organic removal tests were conducted on three different ponds in the purpose of evaluating the influence of the flow velocity and dispersion on the hydraulic efficiency of the pond. The authors have compared the hydraulic flow patterns among ponds with different configurations. Experimental and theoretical analyses were performed. This study indicated that the flow characteristics of square ponds are different from that of baffled ponds; the flow velocity and dispersion are equally important factors which affect the pond hydraulics; the number of inserting baffles can be optimized; and the hydraulic efficiency of multistage ponds is superior to that of baffled ponds.     

Analysis on the long term discharge of a catchment

ＩｎｔｒｏｄｕｃｔｉｏｎＩｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔｔｈｅｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｔｈｅｃａｔｃｈｍｅｎｔｄｉｓｃｈａｒｇｅｗｉｌｌｃｈａｎｇｅｗｉｔｈｌａｎｄｕｓｅ.Ｉｎｔｈｉｓｐａｐｅｒ,ｔｈｅｆｏｃｕｓｉｓｔｏｄｉｓｃｕｓｓｔｈｅｍｏｄｅｌｏｆｌｏｎｇｔｅｒｍｄｉｓｃｈａｒｇｅｏｆｃａｔｃｈｍｅｎｔｗｈｉｃｈｉｎｃｌｕｄｅｓｔｗｏｋｉｎｄｓｏｆｌａｎｄｕｓｅ :ｏｎｅｉｓｆｏｒｅｓｔａｔｔｈｅｕｐｐｅｒｐａｒｔｏｆｔｈｅｃａｔｃｈｍｅｎｔ,ａｎｏｔｈｅｒｉｓｐａｄｄｙｆｉｅｌｄ…     

Simulation investigations on the marble deterioration by sulphur dioxide

This paper deals with investigations on corrosion of marble SO2. We have simulated oxidation of SO2 by photochemical process in the atmosphere. The experiments indicate that formation of SO3 aerosols is related to the concentration of SO2, the UV light intensity, the time of irradiation and the humidity of the air. The corrosion feature of surfaces of the marble and the depth profiles of sulphur were obtained by SEM (Scanning electron microscope), EDXA (Energy-dispersive X-ray analyzer) and SIMS (Secondary ion mass spectrometer). The results of experiments show the corrosive extent of marble depends on its compositions and microareas of marble, which contain lower silicon content can be easily corroded by SO2.     

Study on pollution and eutrophication in the Chaohu Lake

Effect of the pollution on the Chaohu Lake ecosystem has been described based on the results obtained by analysis of water samples and field survey. The environmental behavior of pollutants and their toxicity is discussed in relation to biological effects. Most of the chemicals identified by GC/MS are biodegradable in the water environment except for some organochlorinated hydrocarbons and PAHs. The pollution of the water body particularly cutrophication has led not only to disruption of natural scenic beauty, but also to changes of biotic communities and extinction of certain species. Deterioration of water quality, eutrophication in particular have certainly had an impact on aquatic organisms and on the human health in this region.     

Effect of atmospheric aerosols on UV-B radiation reaching the ground

Solar ultraviolet radiation reaching the ground can be reduced due to light scattering of atmospheric aerosols. Aerosol pollution has led to the decrease in biological active UV-B radiation by about 45% and 10% in city and rural areas, respectively. In populated areas, effect of aerosol scattering on UV-B radiation may offset the increased amount of UV-B caused by ozone depletion, but in clean areas such as two poles, ozone depletion may have great damage effects on ecosystems.     

Study on the oasis corridor landcape in the arid regions based on RS and GIS methods—application of Jinta Oasis,China

The study on the oasis corridor landscape is a new hotspot in the ecological environment research in the arid regions.In oasis,main corridor landscape types include river,ditch ,shelterbelt and road.This paper introduces the basic ecological effects of the corridor landscape on the transporting mass and energy and obstructing desert landscape expansion and incursion.Using Geographic Information System(GIS),we have researched the corridor distribution and its spatial relationship with other landscape types in the Jinta Oasis.Based on the dynamically monitoring on the landscape pattern change of the Jinta Oasis during the latter 10 years by using Remote Sensing(RS) and GIS,the driving functions of the corridors on this change have been analyzed in detail.The analysis results showed that all kinds of corridors‘ characteristics can be quantified by the indexes such as length and width ,ratio of perimeter and area,density and non-heterogeneity.The total corridor length of Jinta Oasis is 1838.5km and its density is 2.1km/km^2.The corridor density of the irrigation land.forest and resident area is maximal,which shows that affection degree of the oasis corridors on them is the most.The improvment of the corridors quality is one of the important driving factors on the irrigation land and so on.The organic combination of the RS and GIS technologies and landscape research methods would be an effective means for the corridor landscape research on arid region oasis.     

A study on the environmental background values in the Mt. Namjagbarwa region, Tibet

A study on the elemental composition of aerosol, water and soil in the Mt. Namjagbarwa region, Tibet, was carried out in the period of 1982 to 1984. Samples of aerosol particles were collected by cascade impactor and analyzed for 10 elements by PIXE. Samples of ice, snow and water were collected and analyzed for trace metals, major cations and anions. The pH values of water were at quasi-neutrality or neutrality, and the hardness of water was low. Contents and physico-chemical composition of 20 elements in the major types of soil were determined by physico-chemical methods. Levels of elements in soil varied with soil type and their parent materials. Contents of some elements were higher in the substratum soil derived from in situ than in the surface soil. The region was in a remote area with negligible pollution and could be considered as a good location for measuring the baskground value of environmental sample.