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Hip resurfacing arthroplasty complicated by mismatched implant components

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world Journal of Orthopedics 2017年第3期8卷 286-289页

作者： Alessandro Calistri Patricia Campbell Catherine Van Der Straeten koen.Aimè De Smet Department of Orthopedic and Traumatology ANCA Clinic Implant Retrieval Lab Orthopaedic Institute for Children Department Orthopaedics and Traumatology UZ University Hospital ANCA Medical Centre

Metal-on-metal hip resurfacing has gained popularity as a feasible treatment option for young and active patients with hip osteoarthritis and high functional *** procedure should only be performed by surgeons who have trained specifically in this *** planning is essential for hip resurfacing in order to execute a successful operation and preview any technical *** authors present a case of a man who underwent a resurfacing arthroplasty for osteoarthritis of the left hip that was complicated by mismatched implant components that were revised three days afterwards for severe pain and leg length *** mistakes,although rare,can be prevented by educating operating room staff in the size and colour code tables provided by the companies on their prostheses or implant boxes.

关键词： Hip resurfacing Mismatch Revision

Practical Considerations for wireless Sensor Network Algorithms

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wireless Sensor Network 2010年第6期2卷 441-446页

作者： Gertjan Halkes koen.Langendoen 不详

Many researchers from different backgrounds have found interesting research challenges that arise from the physical constraints and envisaged applications in wireless Sensor Networks (wSNs). The wSN community that has formed over the years is divided into two sub-communities: the systems sub-community and the theory sub-community. However, there seems to be no connection between the two. Algorithms developed from a theoretic perspective are rarely implemented on real hardwares. In this paper we identify the most important reasons why these algorithms are disregarded by the systems sub-community, and provide pointers to remedy the lack of connection.

关键词： Theory Practice Algorithms

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再访中国西南部的纳西族

西北民族研究 2006年第3期 172-175页

作者： koen.wellens 郭平中央民族大学民族学系

当中国社会学家在20世纪50年代后期来到永宁盆地——这个中国西南部偏僻山区的角落时，当地的纳西族或者摩梭人并不知道等待他们的是什么。经过了一次大规模的社会学调查，还有其后60年代初期更多的田野实地调查，研究者们发现纳西族的... 详细信息

当中国社会学家在20世纪50年代后期来到永宁盆地——这个中国西南部偏僻山区的角落时，当地的纳西族或者摩梭人并不知道等待他们的是什么。经过了一次大规模的社会学调查，还有其后60年代初期更多的田野实地调查，研究者们发现纳西族的亲属关系是母系家族体系，他们不实行制度化的婚姻。这在中国的社会科学家中引起了很大轰动，因为它似乎强化了19世纪刘易斯·亨利·摩尔根提出的社会进化理论。摩尔根是恩格斯等马克思主义社会理论家的一个主要灵感来源，摩尔根认为人类发展要经历几个固定的阶段：从血亲家庭到母系氏族再到父系核心家庭。

关键词：纳西族西南部中国 20世纪50年代社会学家核心家庭母系氏族社会学调查

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Journal of Hydrodynamics 2001年第1期13卷 86-91页

作者： wei Bing-qian, Kunihide Uchijima, Hiroshi Hayakawa Department of Civil Engineering, Kitami Institude of Technology, 165, koen.cho, Kitami, Hokkaido 090-8507, Japan Dep. of Civil Eng. Kitami Institute of Technol. 165 Koen-cho Hokkaido 090-8507 Japan

wT5”BZ]In this study, by considering the scale ratio related to the specific gravity of the submerged bed material, and introducing a degree of distortion, n the similarity laws for a distorted river model with a movable bed were derived under the conditions that the values of dual dimensionless parameters in a regime-criterion diagram for the bars are the same in a model as they are in a prototype, and that a resistance law such as the Manning-Strickler-type formula is to be valid for a model and a prototype. The usefulness of the similarity laws derived in this study was verified by comparing the bed forms from the distroted model experiments with the bed forms from the 1/50-scale undistorted model experiments, which were performed by the Hokkaido Development Bureau (H. D. B.), Japan, to examine the tentative plan for the improvement of a low-flow channel in the Chubetsu River, which is a tributary of the Ishikari River. It is considered that the distorted model experiments to be valid with either sand or lightweight bed material. [wT5”HZ]

关键词： similarity law regime-criterion diagram distorted model lightweight bed material alternate bars

Mechanochemical-Assisted Leaching of Lamp Phosphors： A Green Engineering Approach for Rare-Earth Recovery

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Engineering 2018年第3期4卷 398-405页

作者： Steff Van Loy koen.Binnemans Tom Van Gerven Department of Chemical Engineering KU Leuven Heverlee B-3001 Belgium Department of Chemistry KU Leuven Heverlee B-3001 Belgium

Rare-earth elements （REEs） are essential metals for the design and development of sustainable energy applications, Recycling these elements from waste streams enriched in them is crucial for securing an independent future supply for sustainable applications, This study compares the mechanisms of mechan- ical activation prior to a hydrometallurgical acid-leaching process and a solvometallurgical mechanochemical leaching process for the recovery of REEs from green lamp phosphor, LaPO4：Ce3＋, Th3＋, After 60 min of processing time, the REE leaching rates showed a significant enhancement of 60% after cycled mechanical activation, and 98% after the combined mechanochemical leaching process, High-resolution transmission electron microscopy （HR-TEM） imaging disclosed the cause for the improved REE leaching rates： The improved leaching and leaching patterns could he attributed to changes in the crystal morphology from monocrystalline to polycrystalline, Reduction of the crystallite size to the nanoscale in a polycrystalline material creates irregular packing of chemical units, resulting in an increase in defect-rich grain boundaries in the crystals, which enhances the leaching process, A solvometallurgical method was developed to combine the mechanical activation and leaching process into a single step, which is beneficial for operational cost, This results in an efficient and simple process that provides an alternative and greener recycling route for lamp phosphor waste,

关键词： Mechanochemistry Rare-earth elements Lamp phosphor waste Ball-milling Solvometallurgy

VLES Modelling with the Renormalization Group

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Journal of Thermal Science 2003年第4期12卷 328-331页

作者： Chris De Langhe rug.ac.be Bart Merci rug.ac.be koen.Lodefier rug.ac.be Erik Dick rug.ac.be Ghent University Dept. of Flow Heat and Combustion Mechanics Sint-Pietersnieuwstraat 41 B-9000 Gent Belgium

In a Very-Large-Eddy Simulation (VLES), the filterwidth-wavenumber can be outside the inertial range, and simple subgrid models have to be replaced by more complicated (''RANS-like'') models which can describe the transport of the biggest eddies. One could approach this by using a RANS model in these regions, and modify the lengthscale in the model for the LES-regions. The problem with these approaches is that these models are specifically calibrated for RANS computations, and therefore not suitable to describe inertial range quantities. we investigated the construction of subgfid viscosity and transport equations without any calibrated constants, but these are calculated directly form the Navier-Stokes equation by means of a Renormalization Group (RG) procedure. This leads to filterwidth dependent transport equations and effective viscosity with the right limiting behaviour (DNS and RANS limits).

关键词： very-large-eddy simulation subgrid modellig k-εmodel.

Effect of the welding Parameters on the Structural and Mechanical Properties of Aluminium and Copper Sheet Joints by Electromagnetic Pulse welding

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world Journal of Engineering and Technology 2016年第4期4卷 538-561页

作者： Irene Kwee Verena Psyk koen.Faes Belgian welding Institute Zwijnaarde Belgium Fraunhofer Institute for Machine Tools and Forming Technology Fraunhofer Institute Chemnitz Germany

Aluminium-copper hybrid parts, as a substitution to copper parts, result in weight and cost reduction, and are relevant in applications related to the electronic, heating and cooling sector. However, aluminium to copper joined by thermal welding processes presents challenges in terms of achieving good joint quality. This is attributed to their dissimilar mechanical and thermal properties which result in large stress gradients during heating. This study investigated joining of aluminium to copper sheets by electromagnetic pulse welding, which is a solid-state process that uses electromagnetic forces for joining of dissimilar materials. Hybrid sheet welds were obtained for all parameters conditions, selected according to a Taguchi L18 design. The structural and mechanical characteristics were examined and related to the welding parameters by means of a Pareto analysis and response graphs. The welded zone started with a wavy interface with interfacial layers and defects and evolved to a flat interface without interfacial layers. The maximum transferable force depended on the minimum specimen thickness and the strength of the hybrid sheet weld. In case of aluminium sheet thickness reduction, the maximum transferable force was linearly correlated with the aluminium sheet thickness. High quality joints were obtained for no aluminium sheet thickness reduction and for a sheet weld strength which was at least as high as that of the base material. The most effective way to increase the transferable force was to lower the initial gap and to increase the free length, which resulted in no aluminium sheet thickness reduction. Alternatively, the use of a rounded spacer decreased the effect of the aluminium sheet thickness on the transferable force. An increase in weld width was achieved for an increase in capacitor charging energy and gap, whereas an increase in weld length was obtained for a decrease in gap. An increase in weld width did not necessarily result in an increase in t

关键词： Electromagnetic Pulse Sheet welding Aluminum-to-Copper welds Dissimilar Metal welds Transferable Force Interfacial Morphology

SCM Implementation Decisions of Principal-Agent under Asymmetric Information

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Open Journal of Applied Sciences 2019年第4期9卷 159-171页

作者： Lina wang Stephan Poelmans koen.Milis Economy & Management School Hainan Normal University Haikou China Management School Liaoning University of Technology Jinzhou China Faculty of Economics and Management Hogeschool-Universiteit Brussel KULeuven Association Brussel Belgium Education Management Industry Campus Vesta Brussels Belgium

The optimization investment policy decision of SCM-Supply Chain Management-implementation has been analysed under symmetric and asymmetric information conditions. For both conditions, SCM implementation options’ decision optimizing models have been developed. In these models, both clients and vendors try to pursue their own benefits. Based upon the principal-agent theory, the models show to what extent a principal (a client) needs to pay more to an agent (a vendor) in a context of asymmetric information. For the client, it is important to understand the extra costs to be able to adopt effective strategies to stimulate a vendor to perform an optimal implementation of a SCM system. The results of a simulation experiment regarding SCM implementation options illustrate and verify the theoretical findings and confirm the general notion that the less informed party is obliged to pay information rent to the better-informed party.

关键词： SCM Implementation Problems Asymmetric Information Implementation Control Cost Evaluation Level Principal-Agent Theory

Sustainable urbanization: energy and environment in the Chongqing Municipality, China

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Journal of Chongqing University 2005年第4期4卷 199-207页

作者：李百战 koen.Steermers Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment Under the Ministry of Education Chongqing University Chongqing 400030 P.R. China The Martin Center for Architectural and Urban Studies Department of Architecture University of Cambridge 6 Chaucer Road Cambridge CB2 2EB UK

Chongqing is the largest municipality under the Chinese Central Government (MCG) in terms of administrative area and population and is now the most important economic and cultural center of the upper Yangtze River and Three Gorges area. The Three Gorges Dam project, one of the largest world infrastructure projects, causes a great deal of immigration to Chongqing and results in the rapid urbanization of the city, and it has brought in a great deal of environmental impact, which is a global concerned issue. This paper introduces the city profile of Chongqing municipality and its urbanization impact on energy and environment. The demand and the trend of energy consumption in built environment (building and transport) have been analysed. The living environment of Chongqing residents and the local energy efficient policy have been introduced. Finally the authors discuss the key issues of the sustainable urban development of Chongqing.

关键词： energy and environment Chongqing urbanization building transport air pollution .