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A Stillinger-Weber Potential for InGaN InGaN的Stillinger-Weber势
Pub Date : 2017-09-27 DOI: 10.5539/JMSR.V6N4P88
X. W. Zhou, R. Jones
Reducing defects in InGaN films deposited on GaN substrates has been critical to fill the “green” gap for solid-state lighting applications. To enable researchers to use molecular dynamics vapor deposition simulations to explores ways to reduce defects in InGaN films, we have developed and characterized a Stillinger-Weber potential for InGaN. We show that this potential reproduces the experimental atomic volume, cohesive energy, and bulk modulus of the equilibrium wurtzite / zinc-blende phases of both InN and GaN. Most importantly, the potential captures the stability of the correct phase of InGaN compounds against a variety of other elemental, alloy, and compound configurations. This is validated by the potential’s ability to predict crystalline growth of stoichiometric wurtzite and zinc-blende InxGa1-xN compounds during vapor deposition simulations where adatoms are randomly injected to the growth surface.
减少沉积在GaN衬底上的InGaN薄膜的缺陷对于填补固态照明应用的“绿色”空白至关重要。为了使研究人员能够使用分子动力学气相沉积模拟来探索减少InGaN薄膜中缺陷的方法,我们已经开发并表征了InGaN的Stillinger-Weber势。我们发现该势再现了氮化镓和氮化镓的纤锌矿/锌矿平衡相的实验原子体积、内聚能和体积模量。最重要的是,势捕获了InGaN化合物对各种其他元素、合金和化合物构型的正确相的稳定性。在气相沉积模拟过程中,随机向生长表面注入吸附原子,电势能够预测化学计量纤锌矿和锌-闪锌矿InxGa1-xN化合物的结晶生长,这一点得到了验证。
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引用次数: 9
Study Structure and Properties of Reinforcing Rolled Coils by V-Alloyed C – Mn – Si - Steel with Dual- and Multi-Phase Microstructures 研究双相组织和多相组织的v合金C - Mn - Si钢增强卷材的组织和性能
Pub Date : 2017-09-20 DOI: 10.5539/jmsr.v6n4p79
V. Plyuta, S. Vorobey, G. Levchenko, A. Sychkov, A. Nesterenko
Thermo-mechanical controlled rolling (TMCR) schedules have been studied on the wire line of 400/200 section rolling mill to manufacture 6.0 – mm - diameter reinforcing wire in coils by V-alloyed C – Mn – Si - steel that has dual-phase (DP - ferrite-martensite (bainite)) and multi-phase (MP - ferrite-martensite (bainite) - pearlite) microstructures. It has been established that high tensile strength and plasticity values were achieved in this 6.0 – mm wire in coils (YS 0.2 = 530-550 MPa; TS= 785 – 885 MPa; El 5  = 15.0 – 29.0 %) which were in full compliance with national standard specifications such as ASТM A 615 (USA), JIS G 3112 (Japan) and KSD 3504 (the Republic of Korea)), when the TMCR schedules involving laying head temperatures Т LH from 1024 oС to 1063 oС were employed ensuring formation of MP microstructure.
在400/200节轧机的线材生产线上研究了采用双相(DP -铁素体-马氏体(贝氏体))和多相(MP -铁素体-马氏体(贝氏体)-珠光体)组织的v合金C - Mn - Si钢制造6.0 mm直径的卷状钢筋的热机械控制轧制工艺。结果表明,该6.0 - mm线圈(YS 0.2 = 530- 550mpa;TS= 785 - 885 MPa;El 5 = 15.0 - 29.0%),完全符合国家标准规范,如ASТM A 615(美国),JIS G 3112(日本)和KSD 3504(韩国)),当TMCR时间表涉及铺设头温度Т LH从1024 oС到1063 oС,以确保MP微观结构的形成。
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引用次数: 0
Study on the Quality of Quasi-Isotropic Composite Laminates Containing a Circular Hole 含圆孔准各向同性复合材料层合板的质量研究
Pub Date : 2017-09-18 DOI: 10.5539/JMSR.V6N4P67
V. Balakrishnan, Holger Seidlitz, M. Ambrosio, T. Schuhmann
Composite structures used in modern engineering applications are often subjected to circular holes in order to join with metal components via riveting, bolting or pinning joints. These design based holes will interrupt the force flux in the direction of the fibers and create high stress concentrations near the notched area. Objective of the project is to understand the quality of the quasi-isotropic composite laminates ([45°, -45°, 0°, 90°] S ) containing circular hole. To achieve this objective, a 3-phase portal milling machine and a 5kW continuous wave (cw) CO 2 laser system were used to produce the circular holes in the composite laminates. The processing parameters for both the processes are varied to understand its influence. The quality of the circular hole produced by these methods are further investigated and compared in order to arrive at the optimum processing parameters for the given quasi-isotropic composite laminates. The hole qualities were evaluated by means of delamination factor caused by milling; cone angle, matrix evaporation for cw-CO 2 laser system. For further comparisons, the optimal parameter combinations of both methods were selected for a tensile test according to the standard ASTM D5766-2002.
现代工程应用中使用的复合材料结构通常要打圆孔,以便通过铆接、螺栓连接或钉接与金属部件连接。这些基于孔的设计将打断纤维方向上的力流,并在缺口区域附近产生高应力集中。本课题旨在了解含圆孔的准各向同性复合材料层合板([45°,-45°,0°,90°]S)的质量。为了实现这一目标,使用三相门户铣床和5kW连续波(cw) co2激光系统在复合材料层压板上产生圆孔。这两种工艺的工艺参数是不同的,以了解其影响。为了得到准各向同性复合材料层合板的最佳工艺参数,对这些方法所产生的圆孔质量进行了进一步的研究和比较。用铣削引起的分层系数评价孔的质量;cw- co2激光系统的锥角、基体蒸发。为了进一步比较,根据标准ASTM D5766-2002选择两种方法的最佳参数组合进行拉伸试验。
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引用次数: 6
Photochromic Smart Windows Employing WO3-Based Composite Films 采用wo3基复合薄膜的光致变色智能窗
Pub Date : 2017-09-06 DOI: 10.5539/JMSR.V6N4P62
Hidetoshi Miyazaki, Takumi Ishigaki, T. Ota
WO3-based composite films were fabricated from peroxo-iso-poly tungstic acid and a transparent urethane resin, and the photochromic properties of the films were evaluated under sunlight from three seasons: spring, summer, and winter. All composite films exhibited photochromism under solar irradiation, and the coloring degree of the films varied with the sunlight intensity for each season. We estimate the energy efficiency of the colored composite films for various seasons.
以过氧异聚钨酸和透明聚氨酯树脂为原料制备了wo3基复合薄膜,并对薄膜在春、夏、冬三个季节的光致变色性能进行了研究。所有复合膜在太阳照射下均表现出光致变色,且膜的显色程度随季节光照强度的变化而变化。我们估计了不同季节彩色复合薄膜的能源效率。
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引用次数: 14
Fast-Hardening Foam: Fire and Explosion Prevention at Facilities with Hazardous Chemicals 快速硬化泡沫:危险化学品设施的防火防爆
Pub Date : 2017-08-25 DOI: 10.5539/jmsr.v6n4p56
G. Kuprin, D. Kuprin
Analysis of the terroristic attacks in Siria, Afghanistan and other countries has shown high probability of the hazardous chemicals application by the terroristic groups. In the article the most catastrophic accidents which were connected with hazardous chemicals are described. That is why research and developments in the sphere of protection from hazardous chemicals are still actual. This article is dedicated to the new screening method of the spilled hazardous chemicals surface on the example of protection of the factories with these substances. Methodology, experimental apparatus, protective fast-hardening foam features, names of hazardous chemicals are shown. Test were made for such chemicals as: acetic acid, acetone, ammonia, bromine, chlorbenzene, chloroform, hydrogen bromide, hydrogen chloride, hexane, hydrazine, diesel fuel, dichlorethane, kerosene, toluene, phenol, hydrogen fluoride. Fantastic results were achieved in terms of isolating capability of the fast-hardening foam against evaporations of the pointed substances.
对叙利亚、阿富汗等国发生的恐怖袭击事件的分析表明,恐怖组织使用危险化学品的可能性很大。本文叙述了与危险化学品有关的最严重的事故。这就是为什么在有害化学品保护领域的研究和发展仍然是实际的。本文以危险化学品工厂的防护为例,介绍了危险化学品溢出表面的新筛选方法。给出了方法、实验装置、保护性快硬化泡沫特性、危险化学品的名称。对乙酸、丙酮、氨、溴、氯苯、氯仿、溴化氢、氯化氢、己烷、肼、柴油、二氯乙烷、煤油、甲苯、苯酚、氟化氢等化学物质进行了试验。在快速硬化泡沫对尖物质蒸发的隔离能力方面取得了惊人的结果。
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引用次数: 4
Osteoblasts MC3T3-E1 Response in 2D and 3D Cell Cultures Models to High Carbon Content CoCr Alloy Particles. Effect of Metallic Particles on Vimentin Expression 2D和3D细胞培养模型中成骨细胞MC3T3-E1对高碳CoCr合金颗粒的响应金属颗粒对Vimentin表达的影响
Pub Date : 2017-08-10 DOI: 10.5539/JMSR.V6N4P41
B. Pérez-Maceda, M. E. López-Fernández, I. Díaz, A. Kavanaugh, F. Billi, M. Escudero, M. García-Alonso, R. Lozano
The study of the biocompability of the metallic materials is a priority treating to avoid the osteolysis and aseptic loosening of prosthesis. Wear debris is considered one of the main factors responsible for aseptic loosening of orthopedic endoprostheses. We examined the response of mouse osteoblasts MC3T3-E1 to high carbon cobalt-chrome (HCCoCr) particles obtained a) from wear-corrosion assays on a pin-on-disk tribometer using as pair an alumina ball and a disc of a HCCoCr alloy, and b) HCCoCr bulk particles obtained by nitrogen gas atomization from an alloy used in clinic for prostheses application. Mitochondrial activity and lactate dehydrogenase activity assayed in 2D and 3D osteoblasts cell culture models were used to evaluate the cellular response to size, shape, and chemical composition of the metallic particles. 2D cell model was used to study the direct interaction of cells with particles and 3D cell cultures was used to more closely mimic in vivo conditions. The results showed that vimentin was overexpressed in the 2D osteoblasts cultures in presence of metal particles. This might be related to the appearance of pseudotumor in the peri-prosthetic vicinity described in some implanted patients.
研究金属材料的生物相容性是避免假体骨溶解和无菌性松动的首选治疗方法。磨损碎片被认为是造成骨科假体无菌性松动的主要因素之一。我们研究了小鼠成骨细胞MC3T3-E1对高碳钴铬(HCCoCr)颗粒的反应,这两种颗粒分别来自a)在针盘式摩擦计上进行的磨损腐蚀试验,该试验使用氧化铝球和HCCoCr合金的圆盘作为配对,以及b)通过氮气雾化从临床用于假肢的合金中获得的HCCoCr大块颗粒。在2D和3D成骨细胞培养模型中测定线粒体活性和乳酸脱氢酶活性,以评估细胞对金属颗粒大小、形状和化学成分的反应。二维细胞模型用于研究细胞与颗粒的直接相互作用,三维细胞培养用于更接近地模拟体内条件。结果表明,在金属颗粒存在的2D成骨细胞中,vimentin过表达。这可能与一些植入患者在假体周围附近出现假肿瘤有关。
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引用次数: 2
Modeling, Simulation and Optimization of Piezoelectric Bimorph Transducer for Broadband Vibration Energy Harvesting 宽带振动能量采集用压电双晶片传感器的建模、仿真与优化
Pub Date : 2017-08-09 DOI: 10.5539/JMSR.V6N4P5
Nannan Chen, V. Bedekar
We demonstrate the detailed analysis for conversion of piezoelectric properties into compliance matrix and simulate a series bimorph configuration for vibration based energy generation. Commercially available software COMSOL Multiphysics was used to apply boundary conditions for optimization of geometric parameters such as length, width and thickness of piezoelectric layer to study voltage and power characteristics of the harvester. The resulting energy harvester was found to generate 1.73 mW at 53.4 Hz across a 3MW load with an energy density of 13.08mJ/cm3. We also investigated feasibility of this model by comparing it with existing experimental data of known piezoelectric ceramic compositions and found good correlation between the two.
我们详细分析了压电特性转换为柔度矩阵的方法,并模拟了基于振动的能量产生的一系列双晶形结构。利用COMSOL Multiphysics软件对压电层的长度、宽度和厚度等几何参数进行边界条件优化,研究了压电层的电压和功率特性。由此产生的能量采集器被发现在3MW负载上以53.4 Hz的频率产生1.73 mW,能量密度为13.08mJ/cm3。通过与已有的已知压电陶瓷成分的实验数据进行比较,验证了该模型的可行性,发现两者具有良好的相关性。
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引用次数: 10
Impact Atom Emission 撞击原子发射
Pub Date : 2017-08-09 DOI: 10.5539/JMSR.V6N4P1
M. K. Marakhtanov
It is shown, that if a steel plate is subjected to a projectile impact, the atomic emission is induced from the great amount of craters that appear on the plate’s side opposite to the place of impact application. The craters’ mean size and shape are same to cathode craters in a low-voltage vacuum arc. This similarity shows that the reasons of mechanical and electrical failure of metals can be identical in either case.
结果表明,如果钢板受到抛射物的冲击,原子发射是由与冲击位置相对的钢板一侧出现的大量弹坑引起的。凹坑的平均尺寸和形状与低压真空电弧中的阴极凹坑相同。这种相似性表明,在任何一种情况下,金属的机械和电气故障的原因都是相同的。
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引用次数: 1
Stay on the Cutting-edge of New Technology: Case Study of Gas Turbine Air Filters Durability Enhancement 走在新技术的前沿:燃气轮机空气过滤器耐久性增强案例研究
Pub Date : 2017-08-09 DOI: 10.5539/JMSR.V6N4P28
M. A. Al-Shafei, G. Alabedi
The Research and Development Center (R&DC) of Saudi Aramco has developed new application in ultrasound technology to support the huge networks of crude oil and gas processing facilities, including items of equipment running 24/7.Gas turbines are playing a vital role in supplying energy to different facilities within the companies and they need complex air filtration systems to operate at high speeds and prevent turbine section components from erosion, fouling, and corrosion. Saudi Aramco’s plants have a large number of energy producing gas turbines and the frequent air filter replacement program has become so expensive, that consequently, it has attracted the attention of the plant management to find an appropriate solution for cost reduction.R&DC of Saudi Aramco has completed an extensive investigative study to design and examine ultrasonic (sound waves) technology as a practical, easy-to-apply, and cost-effective cleaning procedure to remove the dust and dirt to maximize the lifetime of the air filters. Experimentally, high frequency sound is passed through a cleaning solution, providing waves of high and low pressure. Microscopic bubbles are produced, which implode almost immediately, bringing the cleaning fluid into contact with the surface being cleaned with great force, thereby breaking down dirt particles and cleaning the surface. Using sonic cleaning, it has been found that the filters are not only cleaned from dust and dirt but also from organic materials without affecting the physical integrity of the air filter.This technical paper benchmarks a technology that has been established to reuse more than 10,000 air filters, which are usually discarded companywide each year. Implementing this technology would not only result in operational cost savings, but also would contribute to the reduction of the local and global environmental impact.
沙特阿美公司的研究与发展中心(R&DC)开发了超声波技术的新应用,以支持庞大的原油和天然气处理设施网络,包括全天候运行的设备项目。燃气轮机在为公司内的不同设施提供能源方面发挥着至关重要的作用,它们需要复杂的空气过滤系统来高速运行,并防止涡轮机部分部件受到侵蚀、结垢和腐蚀。沙特阿美公司的工厂有大量的能源生产燃气轮机和频繁的空气过滤器更换计划已经变得如此昂贵,因此,它已经引起了工厂管理层的注意,寻找一个合适的解决方案来降低成本。沙特阿美公司的研发中心已经完成了一项广泛的调查研究,设计和检验了超声波(声波)技术,作为一种实用、易于应用、经济高效的清洁方法,可以去除灰尘和污垢,从而最大限度地延长空气过滤器的使用寿命。实验中,高频声音通过清洁溶液,产生高压和低压波。产生微小的气泡,这些气泡几乎立即内爆,使清洗液以巨大的力量与被清洁的表面接触,从而粉碎污垢颗粒并清洁表面。使用声波清洗,发现过滤器不仅可以清除灰尘和污垢,还可以清除有机物质,而不会影响空气过滤器的物理完整性。这篇技术论文对一项技术进行了基准测试,该技术已被建立,可重复使用10,000多个空气过滤器,这些过滤器通常每年在全公司范围内被丢弃。实施这项技术不仅可以节省运营成本,还有助于减少对当地和全球环境的影响。
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引用次数: 0
Specimen's Geometry Related Influences on Load-Bearing Capacity of Joining Aluminium and UHSS by Innovative Shear-Clinching 试件几何形状对创新剪切夹紧铝与超高压钢连接承载力的影响
Pub Date : 2017-08-09 DOI: 10.5539/JMSR.V6N4P19
R. Hörhold, M. Müller, M. Merklein, G. Meschut
Economic conditions as well as comfort and safety-related requirements lead to lightweight design especially in automotive body-in-white production processes. The consequential multi-material mix limits the reliability of conventional thermal joining technologies. Innovative mechanical joining technologies need to be established. Following the lightweight-design requirements, next step for weight-reduction would be the renunciation of additional elements. Clinching technologies support this idea by creating a form- and force-fitting joint, but are limited to the formability of the joining partners. Joining by forming without additional elements even of hot formed ultra-high-strength manganese steels and ductile aluminium can be realised by shear-clinching. A precisely coordinated tool setup initialises a crack in the die-sided material with limited formability without harming the punch-sided ductile aluminium. This paper presents current and detailed investigations of the influences of mechanical loads on strength capacity of multi-material joints using shear-clinching technologies. The results clearly show the promising potential and challenges of this innovative single-step joining technology for multi-material mixes.
经济条件以及与舒适性和安全性相关的要求导致了轻量化设计,特别是在汽车白车身生产过程中。由此产生的多种材料混合限制了传统热连接技术的可靠性。需要建立创新的机械连接技术。在轻量化设计要求之后,减重的下一步将是放弃额外的元素。夹持技术通过创建一个形式和力配合的接头来支持这一想法,但受限于连接伙伴的可成形性。即使是热成型的超高强度锰钢和韧性铝,也可以通过剪切夹紧实现无附加元素的成形连接。精确协调的工具设置初始化模具侧材料的裂纹,具有有限的成形性,而不会损害冲孔侧的韧性铝。本文介绍了利用剪切-夹紧技术对机械载荷对多材料接头强度能力影响的最新研究进展。结果清楚地表明,这种用于多种材料混合的创新单步连接技术具有巨大的潜力和挑战。
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引用次数: 11
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Journal of Materials Science Research
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