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American Journal of Basic and Applied Sciences

Basic and Applied Sciences, Recent Articles

Ge isotopic equilibrium fractionation between Ge-containing ferrihydrite and the aqueous solution

Research Article of American Journal of Basic and Applied Sciences Ge isotopic equilibrium fractionation between Ge-containing ferrihydrite and the aqueous solution Peng-dong Wang School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, China Since Ge has a strong affinity for Fe, iron oxyhydroxide is assumed to be one of the potential “missing sinks” of Ge. Ferrihydrite is commonly found in soil and sediments and has a strong affinity for heavy metals. In this study, the first principle method based on density functional theory was used to optimize the geometry of Ge-containing ferrihydrites and H4GeO4 aqueous solution molecular clusters at B3LYP/6-311G(d) level. Solvation effects are treated by “water-droplet” method. Finally, at 298.15 K we obtained the Ge isotopic equilibrium fractionation between Ge-containing ferrihydrites and H4GeO4 aqueous solution, Δ74/70Geferrihydrite-aq= -1.97‰. It enriches the document of Ge isotopic fractionation and helps to assist the study of Ge global cycle. Keywords: Ge isotopes; isotopic equilibrium fractionation; first-principles calculation; ferrihydrite ...
Basic and Applied Sciences, Recent Articles

Cause analysis and treatment of acid wastewater pollution in xiayuanqiaotou coal mine of Kaili City, Guizhou Province

Research Article of American Journal of Basic and Applied Sciences Cause analysis and treatment of acid wastewater pollution in xiayuanqiaotou coal mine of Kaili City, Guizhou Province Mengxia Li1*, Shuai Xu1 1School of Earth Science and Engineering, Hebei University of Engineering, Handan, Hebei 056038, China. In this paper, the acid wastewater pollution caused by the closed pit of xiayuanqiaotou Coal Mine is taken as an example. Through hydrogeological survey and field inspection, the geological and hydrogeological conditions of the study area are understood, and the cause and discharge of acid wastewater pollution in the mining area are analyzed. The results show that the goaf and coal gangue leaching water formed by the disorderly mining of small coal kilns in the Yudonghe Vally are the main sources of acidic wastewater pollution, and direct drainage from the mine mouth is the main drainage method of pollution in the Yudong Vally.Based on this, the technology of source control plus terminal treatment has been adopted, and applying regional water treatment and prevention technology to treatment is a new model of both specimens and treatments.which will play a significant role in the treatment of acid mine water in Guizhou and the south in the future. Keywords: Acid wastewater pollution; Coal mine; Treatment ...
Basic and Applied Sciences, Recent Articles

Traditional Agricultural Practices And Natural Resource Management: The Case Of Gumuz Community In Mandura District

Research Article of American Journal of Basic and Applied Sciences Traditional Agricultural Practices And Natural Resource Management: The Case Of Gumuz Community In Mandura District Bogale Aligaiz Agalu Department of History, Injibara The Gumuz is one of the groups of the people, who are living in Mandura district of the Metekkel administrative Zone, Benishangul-Gumuz Regional state. This study aimed to assess and outline the traditional agricultural practices and natural resource management of the Gumuz community in Mandura district of the Metekel zone, Northwestern Ethiopia, in state of Benishangul-Gumuz region. Gumuz communities of the study area have their own agricultural practices and traditional resource management that distinct them from others. It attempted to high-light on the land tenure system, periodical agricultural activates and approaches of the natural resource management of the community. The paper aims to contribute to the understanding of the traditional agricultural practices and natural resource management of the Gumuz society. Keywords: Gumuz, Agricultural practices, Shifting Cultivation, Natural resource management ...
Basic and Applied Sciences, Recent Articles

Research on Fire Behavior of Ship Engine Room

Research Article of American Journal of Basic and Applied Sciences Research on Fire Behavior of Ship Engine Room Chen keye College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. Due to the need for high performance and reduced commercial cost of ownership, and due to many outstanding advantages such as high strength and light weight, steel has been widely used in engineering practice. In the case of fire, in order to prevent and protect these structures, it is the key issue to study the fire behavior environment. The engine room is also the source of power for ships. It is a high-risk area with frequent fires. Therefore, this paper mainly uses FDS to conduct numerical simulation research through a scaled-down engine room with a size of 3m×3m×3.5m. The change of temperature, pressure and smoke movement in the closed cabin with time at a fire source height of 1.5m is studied. The research shows that the fire behavior inside the closed cabin conforms to the two-zone model, and the fire suppression method of the closed fire has its significant advantages, And looked for the best time to reopen the cabin and the location of subsequent repair structures. Keywords: Fire behavior; Ship engine room; FDS ...

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American Journal of Basic and Applied Sciences

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