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Doping level effect on the luminescence efficiency of Sm3+-doped BaWO4 phosphors prepared by sol-gel process 掺杂水平对溶胶-凝胶法制备Sm3+掺杂BaWO4荧光粉发光效率的影响
Q4 Engineering Pub Date : 2016-10-10 DOI: 10.1504/IJMSI.2016.079652
H. He
The Sm-doped BaWO4 phosphor powders with Sm content of 0-7.5 at.% were fabricated with a sol-gel method. X-ray diffraction analysis, scanning electron microscopy, and photoluminescence spectra analysis were used to characterise the microstructural and photoluminescence efficiency. The effect of Sm doping level was studied. A granular particle morphology and decreased nanoscale average particles size with increasing Sm-doping level were observed. The matrix showed weak violet-blue emission. The Sm3+ in the BaWO4 matrix showed red emission that is obviously stronger than violet-blue emission of the matrix. A maximal doping level of Sm3+ cation was observed for a highest emission efficiency of Sm3+ cation.
制备了Sm含量为0 ~ 7.5 at的Sm掺杂BaWO4荧光粉。%采用溶胶-凝胶法制备。利用x射线衍射分析、扫描电子显微镜和光致发光光谱分析表征了材料的微观结构和光致发光效率。研究了Sm掺杂水平的影响。随着钐掺杂水平的增加,纳米级平均粒径减小,颗粒形貌呈颗粒状。基质呈弱紫蓝色发射。BaWO4基体中的Sm3+呈现红色发射,明显强于基体的紫蓝色发射。Sm3+阳离子掺杂量最大时,Sm3+阳离子的发射效率最高。
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引用次数: 0
Computer simulation for dynamic characteristics of proton exchange membrane fuel cell 质子交换膜燃料电池动态特性的计算机模拟
Q4 Engineering Pub Date : 2016-10-10 DOI: 10.1504/IJMSI.2016.079645
Tao Chen, Shuliang Liu, Hanxia Ruan
Mathematical modelling is essential to investigate the performance of proton exchange membrane fuel cell (PEMFC). In this paper, a system-level dynamic model of PEMFC is developed using the semi-empirical equations. The proposed model is implemented in MATLAB/SIMULINK software to simulate the dynamic characteristics of PEMFC. The dynamic response characteristics of PEMFC are conducted and analysed under multiple layers of step change in the fuel cell loads, which is defined as the input source. The research we have done suggests that is useful to improve the design and performance of PEMFC.
数学建模是研究质子交换膜燃料电池(PEMFC)性能的关键。本文利用半经验方程建立了PEMFC的系统级动力学模型。在MATLAB/SIMULINK软件中实现了该模型,仿真了PEMFC的动态特性。以燃料电池负载为输入源,对多层阶跃变化条件下PEMFC的动态响应特性进行了分析。本文所做的研究为改进PEMFC的设计和性能提供了有益的参考。
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引用次数: 1
Evaluation of mode 1 stress intensity factor for edge crack using displacement extrapolation method 用位移外推法评价边缘裂纹的1型应力强度因子
Q4 Engineering Pub Date : 2016-10-10 DOI: 10.1504/IJMSI.2016.079651
L. Kirthan, R. Hegde, V. Girisha, R. G. Kumar
Fracture is a failure mode due to unstable propagation of a crack due to applied stress. This paper aims towards evaluating stress intensity factor for mode 1 crack propagation using compact tension specimen using displacement extrapolation method and comparing it with analytical solutions. Compact tension specimen was tested for mode 1 crack propagation and stress intensity factor was evaluated for different crack lengths. Displacement extrapolation method was used to find the stress intensity factor by considering the displacements at the flagged nodes near the crack tip and then was compared with the analytical results. Displacement extrapolation method showed good agreement with the analytical results. The results show that the SIF increased at a very slow rate in the beginning of the crack growth and increased rapidly later. This was because of the plastic zone at the crack tip getting increased. This increased the resistance offered by the crack to the propagation.
断裂是由于外加应力导致裂纹不稳定扩展而产生的一种破坏模式。本文旨在利用位移外推法对紧拉试样1型裂纹扩展的应力强度因子进行评价,并与解析解进行比较。对1型裂纹进行了压缩拉伸试验,并对不同裂纹长度下的应力强度因子进行了计算。采用位移外推法考虑裂纹尖端附近标记节点处的位移,求出应力强度因子,并与解析结果进行比较。位移外推法与分析结果吻合较好。结果表明:SIF在裂纹扩展初期以非常缓慢的速度增大,随后迅速增大;这是因为裂纹尖端的塑性区增加了。这增加了裂纹对扩展的阻力。
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引用次数: 3
Multi-domain unified modelling and control parameters optimisation of magnetorheological brake based on Modelica 基于Modelica的磁流变制动器多域统一建模及控制参数优化
Q4 Engineering Pub Date : 2016-10-10 DOI: 10.1504/IJMSI.2016.079639
Zhihua Li, Longhao Yuan, Chaoqun Nie
In order to solve the problem of modelling, simulation and optimisation of magnetorheological brake (MR brake) which is a multi-domain coupling system, the braking performance and control parameters optimisation of MR brake were investigated under a quarter-car model. Firstly, based on Modelica/MWorks platform, using multi-domain unified modelling method, a multi-domain unified MR brake model with anti-lock braking system (ABS) was built. Then by using response surface method (RSM), the response surface function to express the relation between braking distance and three control parameters was formulated, and the optimisation problem of control parameters was solved at MWorks. Finally, according to the optimal control parameters and the structure parameters of MR brake designed by our group before, the simulation of the multi-domain unified MR brake model was done to analyse the change regularity of vehicle speed, slip ratio, braking distance, control current, braking time, etc. under the effect of controller. Results show that MR brake with optimal control parameters has a good braking performance and can meet the requirements of GB7258-2012 standard. This lays the foundation of application of MR brake in vehicles.
为了解决磁流变制动器这一多域耦合系统的建模、仿真和优化问题,在四分之一车模型下对磁流变制动器的制动性能和控制参数优化进行了研究。首先,基于Modelica/MWorks平台,采用多域统一建模方法,建立了具有防抱死制动系统(ABS)的多域统一MR制动模型;然后利用响应面法(RSM),建立了表征制动距离与三个控制参数之间关系的响应面函数,并在MWorks上解决了控制参数的优化问题。最后,根据本课程组设计的最优控制参数和MR制动器的结构参数,对多域统一MR制动器模型进行了仿真,分析了控制器作用下车速、滑移比、制动距离、控制电流、制动时间等参数的变化规律。结果表明,采用最优控制参数的MR制动器制动性能良好,能够满足GB7258-2012标准的要求。这为磁流变制动器在车辆上的应用奠定了基础。
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引用次数: 0
Elimination of boundary effect in silicon electrochemical etching via mechanical stress 利用机械应力消除硅电化学蚀刻中的边界效应
Q4 Engineering Pub Date : 2016-01-01 DOI: 10.1504/IJMSI.2016.10003022
D. Ge, Le Lu, Huang Xiukang, Z. Jinhua, Dongliang Qian, Liqiang Zhang, Zhibao Li
Application of thick macroporous silicon is always one of the hotspots in electrochemistry including micromachining and chemical sensing. One serious problem in macropore formation with high depth-width ratio is the boundary effect. In this work, we applied mechanical stress onto the boundary region of electrochemical etching, which helps to passivate the sidewall of macropore in boundary area, and therefore eliminate the boundary effect effectively. The CBM model was employed to explain the mechanism. Thick macroporous layers without boundary effect were successfully produced in both n-type and p-type silicon.
厚大孔硅的应用一直是包括微加工和化学传感在内的电化学领域的热点之一。高深宽比大孔隙形成的一个严重问题是边界效应。在电化学蚀刻的边界区域施加机械应力,有助于在边界区域钝化大孔的侧壁,从而有效地消除边界效应。采用CBM模型来解释其机理。在n型和p型硅中均成功制备了无边界效应的厚大孔层。
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引用次数: 1
Research on comprehensive information model of complex flexible harness under virtual environment 虚拟环境下复杂柔性线束综合信息模型研究
Q4 Engineering Pub Date : 2016-01-01 DOI: 10.1504/IJMSI.2016.10003020
Y. Shang, Dan Liu, Yuan-Shin Lee, Chunquan Li, Ming Zhang, Hongyang Wang
For the disadvantage of production mode of harness manual measurement, harness automatic forming will become the development trend in the field of harness products. Among that, the information expression of harness plays an important role in harness automatic forming. Firstly, the complex flexible harness comprehensive information model (CFHCIM) is built and how to build the model is described. Then harness expression is described in detail from four aspects of auxiliary components information, electric information, connection information and harness structure information. Finally, the implementation of harness information expression from wiring model verifies the effectiveness of CFHCIM by the UG secondary development, which provides a new thought and method for information expression of harness. At the same time, CFHCIM carries out the preliminary exploration of providing information support for harness automatic forming.
针对线束手工测量生产方式的弊端,线束自动成形将成为线束产品领域的发展趋势。其中线束的信息表达在线束自动成形中起着重要的作用。首先,建立了复杂柔性线束综合信息模型(CFHCIM),并介绍了如何建立该模型。然后从辅助元件信息、电气信息、连接信息和线束结构信息四个方面详细描述了线束表达。最后,通过UG二次开发实现了基于布线模型的线束信息表达,验证了CFHCIM的有效性,为线束信息表达提供了新的思路和方法。同时,CFHCIM对为线束自动成形提供信息支持进行了初步探索。
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引用次数: 0
Experimental study of concrete using recycled coarse aggregate 再生粗骨料混凝土试验研究
Q4 Engineering Pub Date : 2016-01-01 DOI: 10.1504/IJMSI.2016.10003018
H. E. Opara, U. G. Eziefula, C. C. Ugwuegbu
An experimental study of recycled aggregate concrete (RAC) using recycled coarse aggregate (RCA) is reported. The RCA was obtained from construction and demolition waste (C&DW) and used as full replacement of natural coarse aggregate (NCA) for production of RAC. Crushed granite was used as NCA, while crushed concrete rubble from a demolished concrete building was used as RCA. Two groups of concrete mixtures were tested: 100% NCA as control and 100% RCA. Bulk density and compressive strength tests of concrete cubes were conducted at 7, 14, 21, and 28 curing days respectively. The results showed that bulk density and compressive strength of natural aggregate concrete (NAC) were higher than those of RAC for different ages of concrete. The bulk density and compressive strength of the 28-day RAC were 2,328 kg/m3 and 29.42 N/mm2 respectively which satisfied British Standards Institution (1997) BS 8110-1:1997 requirements for structural concrete.
采用再生粗骨料(RCA)对再生骨料混凝土(RAC)进行了试验研究。从建筑垃圾(C&DW)中提取粗骨料,完全替代天然粗骨料(NCA)生产RAC。破碎的花岗岩被用作NCA,而从拆除的混凝土建筑中破碎的混凝土瓦砾被用作RCA。测试了两组混凝土混合料:100% NCA作为对照和100% RCA。分别在养护第7、14、21和28天进行混凝土立方体的容重和抗压强度试验。结果表明:不同龄期天然骨料混凝土(NAC)的容重和抗压强度均高于RAC;28天RAC的容重和抗压强度分别为2328 kg/m3和29.42 N/mm2,满足英国标准协会(1997)BS 8110- 1:20 97对结构混凝土的要求。
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引用次数: 9
Influence of particle arrangement on the stiffness and thermal expansion coefficient of aluminium-epoxy composites 颗粒排列对铝-环氧复合材料刚度和热膨胀系数的影响
Q4 Engineering Pub Date : 2016-01-01 DOI: 10.1504/IJMSI.2016.10003025
E. Sideridis, E. K. Ioakeimidis, V. Kytopoulos
The stiffness and thermal expansion coefficient of periodic polymer composites containing identical spherical particles are studied using micromechanics principles. A cubic unit cell has been considered to predict thermomechanical properties of particulate polymeric composites. This model takes into account the influence of the distribution (arrangement) of spherical inclusions on the thermomechanical constants of the composite material consisting of matrix and filler. A composite model derived from the cubic and face-centred cubic model representing the basic cell of the composite at a microscopic scale was transformed into a five-phase spherical representative volume element (which will be referred henceforth as R.V.E.), in order to apply the classical theory of elasticity to it. Theoretical values arising from this proposed model were compared with experimental results carried out with epoxy resin composites filled with aluminium particles and also with those obtained from other theoretical formulas derived by other scientists.
利用细观力学原理研究了含相同球形颗粒的周期性聚合物复合材料的刚度和热膨胀系数。用立方晶胞来预测颗粒聚合物复合材料的热力学性能。该模型考虑了球形夹杂物的分布(排列)对由基体和填料组成的复合材料的热力学常数的影响。为了将经典弹性理论应用到复合材料模型中,在微观尺度上将代表复合材料基本单元的立方模型和面心立方模型转化为五相球形代表性体积单元(以下简称R.V.E.)。该模型的理论值与填充铝颗粒的环氧树脂复合材料的实验结果以及其他科学家推导的其他理论公式的结果进行了比较。
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引用次数: 0
A CAD/CAE integration method based on Excel 一种基于Excel的CAD/CAE集成方法
Q4 Engineering Pub Date : 2016-01-01 DOI: 10.1504/IJMSI.2016.10003021
Li Xiujuan, Fuyun Liu, Lu Han, L. Renshun, Kuan Li
The parametric design technology, parametric CAE analysis technology and Excel unique functions were analysed, and a CAD/CAE integration method based on Excel was proposed. The proposed method can implement CAD/CAE integration automatically and efficiently. In the whole design analysis process, it needs no manual processing. As an example, an output shaft part was used to verify the accuracy and efficiency of the method. Results show that the proposed method has the characteristics of high universality and strong practicability. The proposed method will provide key technology support for us to realise product design efficiently, and to realise variant designs can satisfy engineering constraints.
分析了参数化设计技术、参数化CAE分析技术和Excel的独特功能,提出了一种基于Excel的CAD/CAE集成方法。该方法能够自动、高效地实现CAD/CAE集成。在整个设计分析过程中,不需要人工处理。以某输出轴零件为例,验证了该方法的精度和效率。结果表明,该方法具有通用性强、实用性强的特点。该方法将为我们有效地实现产品设计,实现满足工程约束的变型设计提供关键技术支持。
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引用次数: 0
Low-temperature fabrication of superhydrophobic surfaces with switchable adhesion property based on ZnO nanorod arrays 基于ZnO纳米棒阵列的具有可切换粘附特性的超疏水表面的低温制备
Q4 Engineering Pub Date : 2016-01-01 DOI: 10.1504/IJMSI.2016.10003024
Jiyuan Zhu, Xiaofang Hu, Yongli Li, J. Xiong
A facile route is reported in this paper to develop superhydrophobic surfaces with controllable water adhesion property based on ZnO nanostructure arrays on metal copper substrate. The rough structure was obtained at normal atmospheric pressure at 35°C. Modified by perfluorooctanoic acid (PFOA), the surfaces were endowed with good superhydrophobic property, showing a static contact angle of water ranging from 151.2° to 154.9° and rolling angle ranging from 5° to 88.5°. The surface adhesion could be adjusted within a wide range. The morphology and crystalline structures of ZnO nanorods were characterised by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The adhesion mechanism of the superhydrophobic surfaces is also discussed and the resulting surfaces are subject to several tests to prove the stability of the surfaces and the feasibility of the research method.
本文报道了一种基于ZnO纳米结构阵列在金属铜衬底上制备具有可控水粘附性能的超疏水表面的简便方法。在35℃常压下得到了粗结构。经全氟辛酸(PFOA)改性后,表面具有良好的超疏水性,水的静态接触角为151.2°~ 154.9°,滚转角为5°~ 88.5°。表面附着力可在较大范围内调节。采用扫描电镜(SEM)、x射线衍射(XRD)和傅里叶变换红外光谱(FTIR)对ZnO纳米棒的形貌和晶体结构进行了表征。讨论了超疏水表面的粘附机理,并对所得表面进行了多次试验,以证明表面的稳定性和研究方法的可行性。
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引用次数: 1
期刊
International Journal of Materials and Structural Integrity
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