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  • 1
    Language: English
    In: Engineering Geology, July 25, 2013, Vol.162, p.1(13)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.enggeo.2013.05.001 Byline: Zhijun Wu, Louis Ngai Yuen Wong Abstract: In this study, the effects of weak and stiff circular inclusions on the overall mechanical behavior, in particular the cracking processes (crack initiation, propagation and coalescence) of a rectangular rock mass under uniaxial compression are investigated. The enriched method, which has been adopted by XFEM to treat the material interfaces, is incorporated into the numerical manifold method (NMM). By incorporating the modified Mohr-Coulomb crack initiation criterion and the crack evolution techniques, the cracking processes of specimens containing either one or two inclusions are successfully modeled by the developed NMM. Comparing the simulation and physical test results, the feasibility of the enriched method in treating inclusions is discussed. Article History: Received 25 January 2013; Revised 8 April 2013; Accepted 2 May 2013
    ISSN: 0013-7952
    Source: Cengage Learning, Inc.
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  • 2
    In: PLoS ONE, 2015, Vol.10(5)
    Description: Background China’s rapidly changing economic landscape has led to widening social inequalities. Occupational status in terms of occupational type and prestige may reflect these socio-structural shifts of social position and be more predictive of self-rated health status than income and education, which may only reflect more gradual acquisitions of social status over time. The goals of this study were to understand the role of occupational status in predicting self-rated health, which is well known to be associated with long-term mortality, as well as compare the occupational status to the other major socioeconomic indicators of income and education. Methods Data from the 2010 baseline surveys of the China Family Panel Studies, which utilized multi-stage probability sampling with implicit stratification was used. Logistic regression was used to examine the relationship of various socioeconomic indicators (i.e. occupational status, income, and education) with self-rated health as the primary outcome of interest. A series of models considered the associations of occupational category or occupational prestige with self-rated health. Results The final sample consisted of 14,367 employed adults aged 18–60, which was nationally representative of working adults in China. We found that occupation was not a major predictor of self-rated health in China when age, ethnicity, location, marital status, physical and mental health status were controlled for, with the exception of women working in lower grade management and professional jobs (OR = 1.82, 95% CI: 1.03–3.22). In comparison, income followed by education exhibited greater association with self-rated health. The highest income group had the least probability to report poor health (In men: OR = 0.30, 95% CI: 0.21–0.43. In women: OR = 0.44, 95% CI: 0.26–0.73). People educated with junior high school had better self-rated health than those with primary and below education level (In men: OR = 0.62, 95% CI: 0.50–0.75. In women: OR = 0.53, 95% CI: 0.42–0.68). Income, education and occupation were correlated with each other. Conclusions Within the context of rapid societal changes in China, income and its implications for greater healthcare access and benefits had the greatest association with self-rated health followed by education. Occupational status was not associated. Occupational categories and prestige should be better adapted to reflect China’s unique sociopolitical and historical context.
    Keywords: Research Article
    E-ISSN: 1932-6203
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  • 3
    In: Chemical Communications, 2013, Vol.49(85), pp.9986-9988
    Description: An electrocatalytic assay was developed for telomerase activity detection by using superior catalytic properties of Pt nanoparticles. This design was PCR-free, and highly sensitive for telomerase with a detection limit of less than 2 cells.
    Keywords: Electrochemistry ; Biological Assay -- Methods ; Metal Nanoparticles -- Chemistry ; Platinum -- Chemistry ; Telomerase -- Analysis;
    ISSN: 1359-7345
    E-ISSN: 1364-548X
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  • 4
    Language: English
    In: Engineering Geology, Oct 30, 2015, Vol.197, p.198(13)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.enggeo.2015.08.028 Byline: Zhijun Wu, Xu Liang, Quansheng Liu Abstract: In this study, a cohesive fracture model (CFM), which assumes rock material as assemblage of deformable grains joining together at their cohesive boundaries, is developed to simulate rock fracture and failure behavior in terms of mineral and cement properties. To better represent the structural bonds between the particles and the heterogeneity of rock material, a user-defined material model (UMAT) for the cohesive element with stochastic strengths is incorporated into the developed CFM. The capability of the developed model for rock fracture problems under both static and dynamic loads is first explored. Based on the developed model, the heterogeneity effect of rock on its dynamic failure process and dynamic strength is then studied. The results demonstrate that the developed CFM can be used to investigate the rock fracture problems under both static and dynamic loads. The heterogeneity of rock material not only affects the rock dynamic failure process but also leads to an increase of rock dynamic strength. Article History: Received 3 January 2015; Revised 23 August 2015; Accepted 31 August 2015
    ISSN: 0013-7952
    Source: Cengage Learning, Inc.
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  • 5
    Language: English
    In: Journal of Luminescence, 2011, Vol.131(11), pp.2419-2421
    Description: In this study, a top-emitting organic light-emitting device (TEOLED) with high efficiency and near angle-independence was fabricated on silicon substrate. The blue-shift of the resonant wavelength (RW) with increasing view angles was nearly negligible. The theoretical simulation was described by a model based on the Fabry–Perot microcavity structure. The maximum current efficiency of the fabricated device is 11.5 cd/A at 12 V. ► Emission characteristics of TEOLED studied in detail through optical simulation. ► Performance of TEOLED is superior to that of the bottom one. ► large spectra shift can be reduced by precisely controlling the resonant wavelength.
    Keywords: Microcavity ; Optical Simulation ; Angle-Independence ; Biology ; Chemistry ; Physics
    ISSN: 0022-2313
    E-ISSN: 1872-7883
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  • 6
    Language: English
    In: Optics Communications, Nov 1, 2012, Vol.285(24), p.4775(4)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.optcom.2012.07.051 Byline: Zhijun Wu, Jiaxian Wang Keywords: Top-emitting; Microcavity; Contrast; Optical simulation Abstract: Organic light-emitting devices (OLEDs) with high contrast are highly in demand, particularly for outdoor applications. However, lowering the reflectance of OLEDs to enhance the contrast ratio can also reduce its efficiency. This study presents in detailthe design of high-contrast blue top-emitting organic light-emitting devices with relatively high efficiency and weak viewing angle dependence. Author Affiliation: College of Information Science and Engineering, Huaqiao University, Quanzhou 362011, PR China Article History: Received 16 October 2011; Revised 9 July 2012; Accepted 11 July 2012
    ISSN: 0030-4018
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: Engineering Geology, July 25, 2013, Vol.162, p.1(13)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.enggeo.2013.05.001 Byline: Zhijun Wu, Louis Ngai Yuen Wong Abstract: In this study, the effects of weak and stiff circular inclusions on the overall mechanical behavior, in particular the cracking processes (crack initiation, propagation and coalescence) of a rectangular rock mass under uniaxial compression are investigated. The enriched method, which has been adopted by XFEM to treat the material interfaces, is incorporated into the numerical manifold method (NMM). By incorporating the modified Mohr-Coulomb crack initiation criterion and the crack evolution techniques, the cracking processes of specimens containing either one or two inclusions are successfully modeled by the developed NMM. Comparing the simulation and physical test results, the feasibility of the enriched method in treating inclusions is discussed. Article History: Received 25 January 2013; Revised 8 April 2013; Accepted 2 May 2013 Article Note: (footnote) [star] This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-No Derivative Works License, which permits non-commercial use, distribution, and reproduction in any medium, provided the original author and source are credited.
    ISSN: 0013-7952
    Source: Cengage Learning, Inc.
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  • 8
    Language: English
    In: Computers and Geotechnics, Jan, 2012, Vol.39, p.38(16)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.compgeo.2011.08.011 Byline: Zhijun Wu, Louis Ngai Yuen Wong Keywords: Numerical manifold method; Partition of unity method; Crack initiation criterion; Stress intensity factor; Tensile wing crack; Secondary crack Abstract: a* Model crack initiation and propagation using the numerical manifold method (NMM). a* Incorporate the Mohr-Coulomb crack initiation criterion into NMM. a* Satisfactorily predict the growth of tensile, shear, and mixed shear-tensile cracks. a* Effects of confining stress, flaw properties and material strength on cracking are investigated. Author Affiliation: School of Civil and Environmental Engineering, Nanyang Technological University, Block N1, Nanyang Avenue, 639798 Singapore, Singapore Article History: Received 13 June 2011; Revised 30 August 2011; Accepted 31 August 2011
    ISSN: 0266-352X
    Source: Cengage Learning, Inc.
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  • 9
    Language: English
    In: Materials Letters, Dec 1, 2013, Vol.112, p.145(4)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.matlet.2013.09.006 Byline: Xiaosong Zhou, Fei Yang, Bei Jin, Yingshang Huang, Zhijun Wu Abstract: The Ti.sup.3+ self-doped anatase TiO.sub.2 nanorods (TNs) with diameter of 15-30nm and length of 80-100nm have been successfully fabricated by the hydrothermal method. The as-prepared Ti.sup.3+ self-doped TNs were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. The as-prepared samples show a greatly enhanced absorbance edge in visible light range and exhibit higher phtotcatalytic activities than pure TNs under visible light irradiation. Author Affiliation: (a) School of Chemistry Science & Technology, and Institute of Physical Chemistry, Zhanjiang Normal University, Zhanjiang 524048, China (b) The State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research of Chinese Academy of Sciences, Beijing 100101, China Article History: Received 3 July 2013; Accepted 3 September 2013
    Keywords: Electron Microscopy ; Titanium Dioxide
    ISSN: 0167-577X
    Source: Cengage Learning, Inc.
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  • 10
    Language: English
    In: Journal of biomechanical engineering, November 2011, Vol.133(11), pp.111002
    Description: This study investigates the effect of the pilot hole size, implant depth, synthetic bone density, and screw size on the pullout strength of the self-tapping screw using analytical, finite element, and experimental methodologies. Stress distribution and failure propagation mode around the implant thread zone are also investigated. Based on the finite element analysis (FEA) results, an analytical model for the pullout strength of the self-tapping screw is constructed in terms of the (synthetic) bone mechanical properties, screw size, and the implant depth. The pullout performance of self-tapping screws is discussed. Results from the analytical and finite element models are experimentally validated.
    Keywords: Bone Screws
    ISSN: 01480731
    E-ISSN: 1528-8951
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