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Scientific Research and Reviews, Recent Articles

First-principles calculation of Zn isotope fractionation during internal adsorption of soil organic matter

Review Article of Scientific Research and Reviews First-principles calculation of Zn isotope fractionation during internal adsorption of soil organic matter Tiandi Zhang School of Earth Science and engineering, Hebei University of Engineering, Handan, Hebei 056038, China. Zn is one of the main ore-forming elements and has important economic value. However, as a heavy metal element, excessive emission will cause serious environmental pollution. At the same time, Zn is a trace element needed for life activities, which is an important component of a variety of enzymes or coenzymes in organisms, and has great significance for biological life activities. But in high concentrations it becomes toxic and affects the health of the organism. This study is based on the first-principles calculation method of density functional theory (DFT) to accurately quantify Zn isotope balance fractionation during the internal formation of organic matter. The calculated results are as follows: Δ66/64Zn=-0.232~-3.036‰ at 25 0C. The more N and S atoms present in the donor atom, the greater the equilibrium fractionation and the greater the enrichment of lighter Zn isotopes. Keywords: Zn isotope, isotopic fractionation, organic matter, first principle calculations ...
Scientific Research and Reviews, Recent Articles

Ecological and environmental problems caused by the exploitation of groundwater resources

Review Article of Scientific Research and Reviews Ecological and environmental problems caused by the exploitation of groundwater resources Chen Xi School of Earth Science and engineering, Hebei University of Engineering, Handan, Hebei 056038, China. With the rapid development of social economy, people’s life on the increasing demand for water resources, surface water resources have been unable to meet the needs of human, and groundwater has stable water supply capacity and good water quality, so the development of groundwater resources has become a topic of concern from all walks of life. If we fail to pay attention to the rationality and appropriateness of resource development, it will inevitably cause certain environmental pollution. This paper first expounded the ecological and environmental problems caused by the overexploitation of groundwater resources, and then put forward reasonable solutions, hoping to help people to rationally use and protect groundwater resources. Keywords: Groundwater resources, Ecological environment, Over exploitation, Solve the advice ...
Scientific Research and Reviews, Recent Articles

Simulation prediction of mine water surges based on Visual MODFLOW

Research Article of Scientific Research and Reviews Simulation prediction of mine water surges based on Visual MODFLOW Pang Yu1*, Li SiYu1 1School of Earth Science and engineering, Hebei University of Engineering, Handan, Hebei 056038, China Mine water damage is a major threat to the safe production of coal mines in China, and how to predict mine water surges scientifically and effectively is an important basis for mine water damage accident prevention and protection of groundwater resources. This paper takes a mine field in northwest China as the research object, comprehensively grasps the geological and hydrogeological conditions of the mine and analyses the causes of coal seam water filling; applies Visual MODFLOW to establish a numerical model of groundwater flow in the study area, and carries out dynamic prediction of mine water influx under natural and artificial boundary conditions respectively based on the method of water conservation and coal mining. The results show that the water influx is significantly reduced under the modified boundary conditions, providing a strong basis for the selection of water-preserving coal mining methods and valuable experience for the mining of coal seams in areas with similar conditions. Keywords: Numerical simulation, Visual MODFLOW, Surge prediction, Water retention coal mining ...
Scientific Research and Reviews, Recent Articles

Beekeeping in the context of unsafe agrochemicals use

Research Article of Scientific Research and Reviews Beekeeping in the context of unsafe agrochemicals use: The case of Seka Chekorsa District of Jima Zone of Oromia, Ethiopia Desta Abi Adami Tulu Agricultural Research Center During 2009/2010, study was carried out to assess agrochemicals use practice and its potential risk on honeybees and beekeeping activities in Seka Chekorsa district of Jimma zone of Oromia. A total of 240 farmer respondents from two rural peasant associations were interviewed using pretested partially structured questionnaires. Focus group discussion was held in the peasant associations for data collection. About 83.3 % of the study participants used different types of agrochemicals (insecticides, herbicides and fungicides) at different levels.50.8%, 22.2%, 13.3%, 7.9%, 3.8% and 2.1% of the respondents did use agrochemicals for fungal, insect, weed, quality product, others and other diseases in decreasing order of importance respectively. Majority of Farmers in the study area have practiced spray form of agrochemicals application as compared to other forms. Even though , there was variability, farmers apply agrochemicals mainly at flowering stage of nearly all cultivated crops. Most of the farmers apply agrochemicals during winter season following irrigation farming in the study area. The respondent farmers confirmed that agrochemicals had affected beekeeping activities in several ways. From the respondents view and field observation in the present study, it is evident to report that agrochemical are recklessly used and do have high risk to beekeeping activities and honeybees population in the study area. Therefore, all stake takers should cooperate to mitigate agrochemicals use practice impact on honeybee population in the ecosystem. Frequent training has to be provided for both beekeepers and crop growers on the sustainable use of agrochemicals and approaches that will lessen potential harm that might be posed to honeybees due to misuse of agrochemicals. Further study is needed ...

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Scientific Research and Reviews

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