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  • Trans Tech Publications, Ltd.  (1,189)
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  • Trans Tech Publications, Ltd.  (1,189)
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  • 1
    Online Resource
    Online Resource
    〈i〉In Situ〈/i〉 Characterization and Molecular Mechanisms Evaluation of Interfacial Interaction between Minerals and Bioleaching Microorganisms
    Trans Tech Publications, Ltd. ; 2017
    In:  Solid State Phenomena Vol. 262 ( 2017-8), p. 321-324
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 262 ( 2017-8), p. 321-324
    Abstract: This article presents as follows the most recent progresses of our group on in-situ characterization and evaluation of the molecular mechanisms of interfacial interaction of minerals and bioleaching microorganisms. (1) By studying the speciation transformation of iron/copper/sulfur on the mineral surface, the evolution of cell surface properties and EPS composition, the evolution of microbial community structure, and the evolution of expression of key oxidase genes during bioleaching, to characterize the adaptation process and therein the effects of it on the specific sulfur oxidation efficiency of bioleaching; (2) by in-situ characterization of the evolution of chalcopyrite surface microstructure, chemical speciation and the biofilm formation, to illustrate the specific adsorption and the relationship between cell growth/biofilm formation and the structure and speciation on the defect mineral surface; (3) by studying the utilization, transformation and activation of S 0 , which is one of the major intermediates during bioleaching, and the distribution of extracellular thiol groups and iron speciation, to evaluate in situ the sulfur activation mechanism; and (4) by comparative proteomics study of the extracellular and outmembrane proteins and looking up the genome sequence, to screen sulfur activation/transportation relevant proteins and genes.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.262
    DOI: 10.4028/www.scientific.net/SSP.262.321
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2051138-3
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  • 2
    Online Resource
    Online Resource
    Simulation Study of Hydraulic Fracturing Mechanism with Heterogeneous Material
    Trans Tech Publications, Ltd. ; 2011
    In:  Materials Science Forum Vol. 704-705 ( 2011-12), p. 993-999
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 704-705 ( 2011-12), p. 993-999
    Abstract: first of all, this paper intensive studies the hydraulic fracturing mechanism of heterogeneous material resultant from the seepage – damage coupling, based on which, the coupled seepage and damage effects during hydraulic fracturing is investigated, and the difficulties of hydraulic fracturing study are how to determine failure modes and breakdown pressure. By using numerically testing method, the mechanical mechanism of hydraulic fracturing under asymmetric distribution of pore pressure with three holes, including fracture patterns, stress flied distribution, initial fracturing pressure and breakdown pressure, was studied by using the FSD model. According to the results of this research, crack extension direction of hydraulic fracturing is influenced not only by the local pore pressure around crack tip, but also by the gradient distribution of macro pore water pressure. The fracturing direction always propagates towards the regions of higher local pore pressure and breakdown pressure decreases with the increasing of local pore pressure. These results are well aggress with the results in the experiments. This research has important theoretical and engineering value. In engineering practice, we can use the porous asymmetric hydraulic fracturing technology to control the direction of crack propagation. Keywords: hydraulic fracturing; numerical simulation; heterogeneous material; asymmetrical
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.704-705
    DOI: 10.4028/www.scientific.net/MSF.704-705.993
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2047372-2
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  • 3
    Online Resource
    Online Resource
    〈i〉In Situ〈/i〉 Characterization of Relevance of Surface Microstructure and Electrochemical Properties of〈i〉 〈/i〉Chalcopyrite to Adsorption of 〈i〉Acidianus manzaensis〈/i〉
    Trans Tech Publications, Ltd. ; 2015
    In:  Advanced Materials Research Vol. 1130 ( 2015-11), p. 183-187
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1130 ( 2015-11), p. 183-187
    Abstract: The in situ relevance of micro- structure and electrochemical properties of chalcopyrite to adsorption of thermoacidophilic bioleaching Archaea Acidianus manzaensis was studied. In this study, the electrochemical behavior of chalcopyrite was first investigated by cyclic voltammetry (CV) to get suitable initial reduction and oxidation potentials, at which electrochemical corrosions of chalcopyrite for several time were performed, respectively, to get specific surface micro-structures. The specific adsorption of A. manzaensis on the electrochemically corroded chalcopyrite surface was then comparatively studied. The changes of microstructure and chemical composition/speciation on the surface of chalcopyrite before and after electrochemical treatment and bio-adsorption was characterized by scanning electron microscopy/electron dispersive spectroscopy (SEM/EDS), and synchrotron radiation-based X-ray diffraction (SR-XRD) and Fe, Cu K-edge X-ray absorption near edge structure (XANES) spectroscopy. The results showed that the suitable initial oxidation and reduction of chalcopyrite electrode were at 0.67 V for 1h and -0.54 V for 10 min, respectively. After treated at 0.67V the surface of chalcopyrite became Cu-deficient with a composition of CuFe 1.02 S 2.15 , and bornite (Cu 5 FeS 4 ) was detected. While after treated at -0.54V, the surface became Fe/S-deficient, with a composition of CuFe 0.33 S 0.81 , and a mass of chalcocite and some covellite were detected. Comparing to the original chalcopyrite, the adsorption capacity of A. manzaensis was increased on the surface of oxidation-treatment at 0.67 V, and decreased on the surface of reduction-treatment at -0.54 V. It clearly demonstrates the bornite-containing copper deficient chalcopyrite surface was more preferably adsorbed, whereas the chalcocite-containing Fe/S deficient chalcopyrite surface was less adsorbed by A. manzaensis, indicating the dependence of the specific adsorption of A. manzaensis upon the secondary minerals as well as Fe/S availability in the microstructure of chalcopyrite.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.1130
    DOI: 10.4028/www.scientific.net/AMR.1130.183
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2015
    detail.hit.zdb_id: 2265002-7
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  • 4
    Online Resource
    Online Resource
    Comparative Study of Iron and Sulfur Speciation Transformation of Pyrite and Marcasite by Extreme Thermophilic Archaea 〈i〉Acidianus manzaensis〈/i〉
    Trans Tech Publications, Ltd. ; 2015
    In:  Advanced Materials Research Vol. 1130 ( 2015-11), p. 342-346
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 1130 ( 2015-11), p. 342-346
    Abstract: Differential utilization of isomers pyrite and marcasite by Acidianus manzaensis were comparatively studied, besides the iron and sulfur speciation transformation of the minerals was also investigated based on synchrotron radiation X-ray absorption near edge structure (XANES) spectroscopy. The results showed that the biooxidation of pyrite was faster than marcasite. The bioleached surface of both pyrite and marcasite are serious corroded, and the Fe (III)-containing species as well as jarosite were gradually produced, and more elemental sulfur species were formed on the marcasite surface than that for pyrite. It demonstrates the mineral structure does affect the biooxidation of pyrite and marcasite, and the more precipitated elemental sulfur might be one of the reasons leading to lower oxidation rate of marcasite by A. manzaensis .
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.1130
    DOI: 10.4028/www.scientific.net/AMR.1130.342
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2015
    detail.hit.zdb_id: 2265002-7
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  • 5
    Online Resource
    Online Resource
    Improvement of Vehicle Crashworthiness for Full Frontal Impact Based on Energy Flow Analysis
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 139-141 ( 2010-10), p. 1365-1369
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 139-141 ( 2010-10), p. 1365-1369
    Abstract: Vehicle crashworthiness is one of the most important indicators to assess the automotive performance, which is directly related with passenger’s life and safety. Therefore, more attention has been paid to improve the automotive passive safety. This paper presents the analysis method based on energy flow analysis to solve the automotive crashworthiness problem. The energy transfer model is built based on the constraints analysis for product performance and the rational energy flow element partition. According to the energy transfer model, the energy absorption of each component can be attained from the finite element crash simulation result and also the energy distribution relationship can be analyzed. Based on the analysis results, the full front impact crashworthiness of a car is improved by modifying the energy flow path and distribution. It also demonstrates that the method is effective to solve the automotive crashworthiness problem.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.139-141
    DOI: 10.4028/www.scientific.net/AMR.139-141.1365
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2265002-7
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  • 6
    Online Resource
    Online Resource
    Study on Adhesion Properties of Poly (sodium acrylate)-Polyvinyl Alcohol Super Absorbent Resin
    Trans Tech Publications, Ltd. ; 2013
    In:  Applied Mechanics and Materials Vol. 423-426 ( 2013-9), p. 312-317
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 423-426 ( 2013-9), p. 312-317
    Abstract: A poly (sodium acrylate)-polyvinyl alcohol superabsorbent resin is synthesized from acrylic acid (AA) and polyvinyl alcohol. A new method is established to measure the adhesion properties. Then the influence of different experimental conditions on the adhesion properties of the resin is discussed. The results indicate that the adhesion properties of super absorbent resin have some variation with the water absorption increased, the initial pressure and the separation rate. It can be explained by the theory of polymer structure, mechanical interlock and stress relaxation.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.423-426
    DOI: 10.4028/www.scientific.net/AMM.423-426.312
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2251882-4
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  • 7
    Online Resource
    Online Resource
    Genetic Optimized BP Network Method for Camera Calibration in Binocular Vision
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 756-759 ( 2013-9), p. 3404-3409
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 756-759 ( 2013-9), p. 3404-3409
    Abstract: Camera calibration is the first step of positioning using binocular vision. Owning to the approximation capability of the neural network, a complex mathematical model needed by traditional calibration methods can be avoided. However the general neural network methods have their drawbacks to reduce its accuracy. This paper presents searching algorithm for the best structure and parameters of a neural network using an improved genetic algorithm (GA). The experiments show that this method can be used to establish a mapping between 2D coordinates and 3D coordinates directly and accurately, which is better than traditional calibration and general BP network methods.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.756-759
    DOI: 10.4028/www.scientific.net/AMR.756-759.3404
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2265002-7
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  • 8
    Online Resource
    Online Resource
    Grasshopper [〈i〉Chondracris rosea rosea 〈/i〉(De Geer)] Incisors Cutting Edge Contour Data Extraction and Quantitative Analysis
    Trans Tech Publications, Ltd. ; 2013
    In:  Applied Mechanics and Materials Vol. 461 ( 2013-11), p. 144-151
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 461 ( 2013-11), p. 144-151
    Abstract: Grasshopper [Chondracris rosea rosea (De Geer)] possesses sharp and serrated incisors that have an advantageous capacity for cutting crops including leaves and stalks. To quantitatively analyze the geometrical structures of the incisors cutting edge, MATLAB digital image processing and edge detection technology were used to obtain incisors outer margin 2-dimensional point cloud from incisors stereomicroscope photograph. Then, the least squares fitting method was used to fit the curves mathematical model and the outer margin curves of incisors which were segmented into five curves. The serrated outline of incisor was fitted and expressed by nine-order polynomial function. Furthermore, the second derivative and curvature of the outer edge curves were calculated. Finally, the geometrical characteristics of grasshopper incisors outer edge curves were analyzed and discussed. In conclusion, the special shaped incisor of grasshopper is a potential prototype that can be exploited to develop new cutting element to cut lignocellulosic biomass more efficiently. These results would be helpful for designing cutting elements on crop harvesting, biomass size reduction and other cutting machinery.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.461
    DOI: 10.4028/www.scientific.net/AMM.461.144
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2251882-4
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  • 9
    Online Resource
    Online Resource
    Multi-Objective Optimization Design for Double Toggle Clamping Unit of Injection Molding Machine
    Trans Tech Publications, Ltd. ; 2012
    In:  Applied Mechanics and Materials Vol. 201-202 ( 2012-10), p. 15-19
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 201-202 ( 2012-10), p. 15-19
    Abstract: Clamping unit is an important component of injection molding machine. The clamping force and the clamping speed of clamping unit not only effect on the quality of molding products, but also determine the cyclic number. The large force amplification and large stroke ratio can reduce energy consumption and improve the productive efficiency. In this article, force amplification ratio and stroke ratio were used as the optimization goals. Non-dominated sorting genetic algorithm was used as the optimization method. The optimization result was better than the original design. So this article provides a reference for the same or similar product’s optimization.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.201-202
    DOI: 10.4028/www.scientific.net/AMM.201-202.15
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2251882-4
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  • 10
    Online Resource
    Online Resource
    A Simple Calculation of System Matrix Base on 2-D Index
    Trans Tech Publications, Ltd. ; 2013
    In:  Applied Mechanics and Materials Vol. 339 ( 2013-7), p. 247-252
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 339 ( 2013-7), p. 247-252
    Abstract: The system matrix plays an important role in the improvement of medical image reconstruction quality in iterative reconstruction. It consists of a certain sequence of projection coefficients. Projection coefficients indicate the radiological path through a tow-dimensional grid array which is constructed based on the reconstructed image. It is a common geometric problem of evaluating the radiological path through the grid array. This paper identifies the inefficient aspect of the traditionally precise evaluation of the radiological path. A new accurate and simple algorithm is presented, which considers that the projection coefficients can be shown in two-dimensional way. Experimental results based on GATE (Geant4 Application for Tomographic Emission) simulating PET (Positron Emission Tomography) imaging shows that the proposed algorithm is efficient to build up a system matrix, and the image can be reconstructed by the system matrix.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.339
    DOI: 10.4028/www.scientific.net/AMM.339.247
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2251882-4
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