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Gully Erosion and Landslides in Southeastern Nigeria: Causes, Consequences and Control Measures

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  Abstract In southeastern Nigeria, soil and gully erosion and landslides are responsible for the widespread destructions of human, animal and plant lives, domestic, industrial and commercial property, transportation and communication systems, degradation of arable lands, contamination of surface and groundwater supplies, isolation of settlements and migration of communities. This account presents some of the results of research and studies of gully erosion and landslides carried out over the years in parts of southeastern States of Abia, Anambra, Enugu, Ebonyi and Imo States. Gully erosion is attributed to natural and anthropogenic causes, with the latter being most prevalent. Gully initiation is the result of localized erosion by surface runoff and soil eluviation associated with rainfall events of high intensity. Erosion is frequently concentrated where the forest cover has been removed for agricultural, urbanization and construction purposes and also at sites of u...
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  CUDA-based Accelerated FEM Calculation Authored by Cankun Zheng The Finite Element Method (FEM) had been widely used in engineering applications. There are two bottleneck issues in the FEM calculation. The first one is how to minimize computer memory demand so that to be able to run large-scale simulations using limited computational resources. The second one is how to carry out simulation as fast as possible to complete a large-scale simulation job. A standard finite element analysis always results in solving simultaneous linear equations. Overall, a global stiffness matrix of a finite element simulation often has sparse, symmetric, and positive definite characteristics. To overcome the first issue, we proposed integrating and storing stiffness matrix using the Compressed Sparse Row (CSR) format in this paper. We proposed to carry out parallel computing to solve simultaneous equations using the cuBlAS, cuSPARSE, and cuSOLVER libraries on the Compute Unified Device Architecture ...
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  Biological Processes In Urban Mines Authored by Navarro Hidalgo Keywords: Critical elements; Microorganisms; Urban mines; Biological processes; Recycling Introduction The innovation and development of high technology have demanded the exploration of some chemical elements in greater quantity. These elements have physicochemical properties of high economic interest. Some countries have larger amounts of the reserves of these elements, creating an imbalance in world supply. An example of the use of these materials are rare earth elements widely used in equipment with greater energy efficiency and magnets in wind generators. They are also present in increasingly modern computers, cell phones and televisions. Given this reality, thiswork proposes to recover critical elements from alternative sources (electronic waste - REE) using a biological process as a tool for  solubilization of waste elements with subsequent recovery. The proposed technique is bio-hydrometallurgy, already...
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