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Two-dimensional topological insulators in group-11 chalcogenide compounds: M2Te (M=Cu, Ag) 11族硫族化合物的二维拓扑绝缘体:M2Te (M=Cu, Ag)
Pub Date : 2016-06-29 DOI: 10.1103/PHYSREVB.93.235451
Yandong Ma, Liangzhi Kou, Ying Dai, T. Heine
Two-dimensional (2D) topological insulators (TIs) are recently recognized states of quantum matter that are highly interesting for lower-power-consuming electronic devices owing to their nondissipative transport properties protected from backscattering. So far, only few 2D TIs, suffering from small bulk band gap (<10meV), have been experimentally confirmed. Here, through first-principles calculations, we propose a family of 2D TIs in group-11 chalcogenide 2D crystals, M2Te(M=Cu,Ag). The nontrivial topological states in Cu2Te and Ag2Te 2D crystals, identified by topological invariant and edge state calculations, exhibit sizeable bulk gaps of 78 and 150 meV, respectively, suggesting that they are candidates for room-temperature applications. Moreover, strain engineering leads to effective control of the nontrivial gaps of Cu2Te and Ag2Te, and a topological phase transition can be realized in Cu2Te, while the nontrivial phase in Ag2Te is stable against strain. Their dynamic and thermal stabilities are further confirmed by employing phonon calculations and ab initio molecular dynamic simulations. © 2016 American Physical Society.
二维(2D)拓扑绝缘体(ti)是最近公认的量子物质状态,由于其不受反向散射的非耗散输运特性,对于低功耗电子器件非常感兴趣。到目前为止,只有少数具有小块带隙(<10meV)的二维ti得到了实验证实。在这里,通过第一性原理计算,我们在11族硫系二维晶体M2Te(M=Cu,Ag)中提出了二维ti族。Cu2Te和Ag2Te二维晶体中的非平凡拓扑状态,通过拓扑不变量和边缘状态计算确定,分别表现出78和150 meV的相当大的体积间隙,表明它们是室温应用的候选材料。此外,应变工程可以有效控制Cu2Te和Ag2Te的非平凡间隙,Cu2Te可以实现拓扑相变,而Ag2Te的非平凡相在应变下是稳定的。利用声子计算和从头算分子动力学模拟进一步证实了它们的动态和热稳定性。©2016美国物理学会。
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引用次数: 31
Delivering sustainable communities: A case study in China 构建可持续社区:以中国为例
Pub Date : 2016-06-20 DOI: 10.1108/BEPAM-07-2014-0032
Bo Xia, Tian Wu, M. Skitmore, Qing Chen, Mei Li, J. Zuo
Purpose - China’s accelerated urbanization leads directly to pressure on the urban environment. This research aims to identify best practices involved in a real sustainable community projects for the experience to be replicated in future. Design approach - A case study was conducted on the 'Linked Hybrid' in Beijing, China. The case study involved both document analysis and semi-structured interviews. The document analysis was conducted on project information sheets, reports and the results of a survey of the residents. The interviews on the other hand were conducted with key practitioners involved in the project. Findings - The findings identify the green technologies and strategies used in the project planning and design process. The social considerations of the project development are also recognized in providing comfort, convenience and safety for their residents. Furthermore, the research highlights the fact that sustainable communities can incur less operational costs compared with traditional ones and therefore provide a feasible option for clients with a greater capability for upfront investment. Originality/significance - The results of the research provide valuable references for developers in the development of sustainable communities in both China and other countries.
目的——中国城市化的加速直接给城市环境带来压力。本研究旨在找出一个真正可持续的社区项目所涉及的最佳做法,以供将来复制。设计方法-对中国北京的“链接混合”进行了案例研究。案例研究包括文件分析和半结构化访谈。文献分析是根据项目信息表、报告和对居民的调查结果进行的。另一方面,访谈是与参与项目的主要从业人员进行的。调查结果-调查结果确定了项目规划和设计过程中使用的绿色技术和策略。在为居民提供舒适、便利和安全方面,项目发展的社会考虑也得到了认可。此外,研究强调了这样一个事实,即与传统社区相比,可持续社区的运营成本更低,因此为有更大能力进行前期投资的客户提供了一个可行的选择。独创性/意义——研究结果为国内外可持续社区的开发提供了有价值的参考。
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引用次数: 5
Preliminary and robust design analysis of a solar thermal power block 太阳能热发电模块的初步稳健设计分析
Pub Date : 2016-06-13 DOI: 10.1115/GT2016-57172
R. Persky, E. Sauret
Australia is endeavouring to expand the mix of power resources, and is investing heavily in the development of renewable generation methods such as concentrated solar thermal power. In these systems, the power block and turbine need to maintain high efficiency under non-ideal conditions away from the design point. Literature shows that there is a clear relationship between the selection of fluids, the design of the operating cycle, the fluctuation in operating conditions and changes in power block performance. It is thus important for innovative power block designs to consider the performance of the system as a whole rather than by component, mainly turbine design, cycle development and economic analysis. However, there are few works that consider the coupling of multidisciplinary design and robust design to turbine-fluid selection and economic analysis for realistic systems. Furthermore, existing methodologies for robust optimisation often do not consider the effects of high-density gas properties on the performance of the power block. It is also critical that a power generation system produces ideal economic outcomes that meet a number of key performance indicators including levelised cost of electricity. Therefore, this paper develops a preliminary multidisciplinary design and robust design applied to turbine-fluid selection and economic analysis of a solar-thermal power block. In this work, an Organic Rankine Cycle using novel working fluids for a solar thermal power system is developed. Integrating robust optimisation into the development of the power block is key to push efficiency further and guarantee power block feasibility when running at non-ideal conditions. A preliminary multidisciplinary optimisation is applied to design the complete power block concept such that the power block operates at peak performance across multiple analysis approaches. When using a multidisciplinary design approach, it is possible to perform robust optimisation on the whole power block where the target is on the economic outcomes rather than traditional targets such as efficiency, specific power generation capacity or size.
澳大利亚正在努力扩大电力资源的组合,并正在大力投资发展可再生发电方法,如集中太阳能热发电。在这些系统中,动力块和涡轮机需要在远离设计点的非理想条件下保持高效率。文献表明,流体的选择、运行周期的设计、运行工况的波动与动力块性能的变化之间存在着明确的关系。因此,对于创新的动力块设计来说,将系统的性能作为一个整体而不是单个部件来考虑是很重要的,主要是涡轮设计、循环开发和经济分析。然而,将多学科设计和鲁棒性设计的耦合考虑到实际系统的涡轮流体选择和经济分析的工作很少。此外,现有的稳健优化方法通常没有考虑高密度气体特性对动力块性能的影响。同样重要的是,发电系统产生理想的经济结果,满足一些关键绩效指标,包括电力成本的平衡。因此,本文对太阳能热发电机组的涡轮流体选择和经济性分析进行了初步的多学科设计和稳健设计。在这项工作中,开发了一个使用新型工质的有机朗肯循环,用于太阳能热发电系统。将稳健的优化集成到动力块的开发中是进一步提高效率和保证动力块在非理想条件下运行可行性的关键。初步的多学科优化应用于设计完整的功率块概念,使功率块在多种分析方法的峰值性能下运行。当使用多学科设计方法时,可以在整个电力块上执行稳健的优化,其中目标是经济结果,而不是传统的目标,如效率,特定发电容量或规模。
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引用次数: 2
Comparison of visual inspection and structural-health monitoring as bridge condition assessment methods 目测与结构健康监测作为桥梁状态评估方法的比较
Pub Date : 2016-06-01 DOI: 10.1061/(ASCE)CF.1943-5509.0000802
Duzgun Agdas, J. Rice, Justin Martinez, I. Lasa
This paper presents the results of a research project aimed at examining the capabilities and challenges of two distinct but not mutually exclusive approaches to in-service bridge assessment: visual inspection and installed monitoring systems. In this study, the intended functionality of both approaches was evaluated on its ability to identify potential structural damage and to provide decision-making support. Inspection and monitoring are compared in terms of their functional performance, cost, and barriers (real and perceived) to implementation. Both methods have strengths and weaknesses across the metrics analyzed, and it is likely that a hybrid evaluation technique that adopts both approaches will optimize efficiency of condition assessment and ultimately lead to better decision making.
本文介绍了一项研究项目的结果,该项目旨在研究两种不同但并非相互排斥的在用桥梁评估方法的能力和挑战:目视检查和安装监控系统。在本研究中,对这两种方法的预期功能进行了评估,以确定潜在的结构损伤和提供决策支持的能力。检查和监视在功能性能、成本和实现障碍(实际的和可感知的)方面进行比较。两种方法在分析指标时各有优缺点,采用两种方法的混合评估技术可能会优化状态评估的效率,并最终做出更好的决策。
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引用次数: 113
Stability and corrosion testing of a high temperature phase change material for CSP applications CSP高温相变材料的稳定性和腐蚀测试
Pub Date : 2016-05-31 DOI: 10.1063/1.4949127
Ming Liu, S. Bell, N. Tay, G. Will, W. Saman, F. Bruno
This paper presents the stability and corrosion testing results of a candidate high temperature phase change material (PCM) for potential use in concentrating solar power applications. The investigated PCM is a eutectic mixture of NaCl and Na2CO3 and both are low cost materials. This PCM has a melting temperature of 635 °C and a relatively high latent heat of fusion of 308.1 J/g. The testing was performed by means of an electric furnace subjected to 150 melt-freeze cycles between 600 °C and 650 °C. The results showed that this PCM candidate has no obvious decomposition up to 650 °C after 150 cycles and stainless steel 316 potentially can be used as the containment material under the minimized oxygen atmosphere.
本文介绍了一种可能用于聚光太阳能发电的候选高温相变材料(PCM)的稳定性和腐蚀测试结果。所研究的PCM是NaCl和Na2CO3的共晶混合物,两者都是低成本材料。该PCM的熔化温度为635℃,熔合潜热较高,为308.1 J/g。测试是通过在600°C和650°C之间进行150次融冻循环的电炉进行的。结果表明,该候选PCM经过150次循环后,在650℃以下没有明显的分解,在最小氧气氛下,316不锈钢有可能作为密封材料。
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引用次数: 5
Optimisation techniques for planning automatic under frequencyload shedding in New Zealand’s power system 新西兰电力系统低频自动减载规划的优化技术
Pub Date : 2016-05-26 DOI: 10.21914/ANZIAMJ.V57I0.10015
R. Burdett, J. Boland, C. Edwards
Electricity generation is vital in developed countries to power the many mechanical and electrical devices that people require. Unfortunately electricity generation is costly. Though electricity can be generated it cannot be stored efficiently. Electricity generation is also difficult to manage because exact demand is unknown from one instant to the next. A number of services are required to manage fluctuations in electricity demand, and to protect the system when frequency falls too low. A current approach is called automatic under frequency load shedding (AUFLS). This article proposes new methods for optimising AUFLS in New Zealand’s power system. The core ideas were developed during the 2015 Maths and Industry Study Group (MISG) in Brisbane, Australia. The problem has been motivated by Transpower Limited, a company that manages New Zealand’s power system and transports bulk electricity from where it is generated to where it is needed. The approaches developed in this article can be used in electrical power systems anywhere in the world.
在发达国家,发电为人们所需的许多机械和电气设备提供动力是至关重要的。不幸的是,发电成本很高。虽然可以发电,但不能有效地储存。发电也很难管理,因为从一个时刻到下一个时刻的确切需求是未知的。需要一些服务来管理电力需求的波动,并在频率过低时保护系统。目前的一种方法被称为自动低频减载(AUFLS)。本文提出了新西兰电力系统AUFLS优化的新方法。核心思想是在2015年澳大利亚布里斯班的数学和工业研究小组(MISG)期间提出的。这个问题是由管理新西兰电力系统并将大量电力从发电场输送到需要的地方的transpwer Limited公司引发的。本文开发的方法可用于世界上任何地方的电力系统。
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引用次数: 1
Seaweed cultivation and the remediation of by-products from ethanol production: A glorious green growth 海藻的培养和乙醇生产副产物的修复:一个辉煌的绿色生长
Pub Date : 2016-05-25 DOI: 10.21914/ANZIAMJ.V56I0.9402
W. Sweatman, G. Mercer, J. Boland, N. Cusimano, Ava A. Greenwood, K. Harley, P. Heijster, Peter S. Kim, J. Maisano, M. Nelson, G. Pettet
In this paper, seaweed cultivation is mathematically modelled. The potential use of the crop to consume by-products from ethanol production is considered with a feasibility study and simple financial model. The growth of seaweed is described using differential equations and considering various factors such as solar radiation.
本文对海藻养殖进行了数学建模。通过可行性研究和简单的财务模型,考虑了该作物消耗乙醇生产副产品的潜在用途。用微分方程描述了海藻的生长,并考虑了太阳辐射等各种因素。
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引用次数: 2
How do construction firms learn on collaborative infrastructure projects 建筑公司如何从协作基础设施项目中学习
Pub Date : 2016-05-04 DOI: 10.4324/9781315758053-15
Le Chen, K. Manley
Construction firms that employ collaborative procurement approaches develop operating routines through joint learning so as to improve infrastructure project performance. This paper reports a study based on a survey sample of 320 construction practitioners which were involved in collaborative infrastructure delivery in Australia. The study developed valid and reliable scales for measuring collaborative learning capability (CLC), and used the scales to evaluate the CLC of contractor and consultant firms within the sample. The evaluation suggests that whilst these firms explore knowledge from both internal and external sources, transform both explicit and tacit knowledge, and apply and internalise new knowledge, they can improve the extent to which these routines are applied to optimise project performance.
采用协同采购方法的建筑公司通过共同学习制定操作规程,从而提高基础设施项目绩效。本文报告了一项基于对澳大利亚参与协作基础设施交付的320名建筑从业人员的调查样本的研究。本研究开发了有效可靠的协作学习能力量表,并利用该量表对样本内的承包商和咨询公司的协作学习能力进行了评估。评估表明,虽然这些公司从内部和外部资源探索知识,转化显性和隐性知识,并应用和内化新知识,但他们可以提高这些常规应用的程度,以优化项目绩效。
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引用次数: 0
Workplace training and generic and technical skill development in the Australian construction industry 澳大利亚建筑行业的工作场所培训和一般技术技能发展
Pub Date : 2016-04-26 DOI: 10.1108/JMD-05-2015-0073
Nicole Detsimas, V. Coffey, Zabihullah Sadiqi, Mei Li
- Purpose The purpose of this paper is to investigate the current skills gap in both generic and skill areas within the construction industry in Queensland, Australia. - Design/methodology/approach An internet-based survey was administered to collect the opinions of construction employees about the workplace-training environment and their perceptions towards training. The survey intended to address the following research questions, specifically in relation to the construction industry. - Findings The survey results reveal that whilst overall participation in workplace training is high, the current workplace training environments do not foster balanced skill development. The study reveals that in the current absence of a formal and well-balanced training mechanism, construction workers generally resort to their own informal self-development initiatives to develop the needed role-specific theoretical knowledge. - Research limitations/implications The findings of the research are based on the data primarily collected in the construction industry in Queensland, Australia. The data are limited to a single Tier 2 construction company. - Practical implications The findings of this study can be utilised to suggest improvements in the current (or develop new) workplace training initiatives. - Social implications The research suggests that workplace training has positive relationship with career growth. The results suggest that in the construction industry, employees are generally well aware of the importance of workplace training in their career development and they largely appreciate training as being a critical factor for developing their capacity to perform their roles successfully, and to maintain their employability. - Originality/value This paper is unique as it investigates the current skills gap in both generic and skill areas within the construction industry in Queensland, Australia. So far no work has been undertaken to identify and discusses the main method of workplace learning within the Tier 2 industry in the context of Queensland Australia.
本文的目的是调查澳大利亚昆士兰州建筑行业中通用和技能领域的当前技能差距。设计/方法/方法进行了一项基于互联网的调查,以收集建筑员工对工作场所培训环境的意见和他们对培训的看法。该调查旨在解决以下研究问题,特别是与建筑行业有关的问题。-调查结果调查结果显示,虽然在职培训的整体参与度很高,但目前的在职培训环境并没有促进平衡的技能发展。研究表明,在目前缺乏正式和均衡的培训机制的情况下,建筑工人普遍通过自己的非正式自我发展倡议来发展所需的角色特定理论知识。-研究的局限性/影响研究的结果是基于主要在澳大利亚昆士兰的建筑行业收集的数据。这些数据仅限于一家二级建筑公司。-实际意义这项研究的结果可用于建议改进当前(或开发新的)工作场所培训计划。研究表明,职场培训与职业发展呈正相关。结果表明,在建筑行业,员工普遍意识到工作场所培训在其职业发展中的重要性,他们在很大程度上认为培训是发展他们成功履行职责的能力和保持就业能力的关键因素。这篇论文是独一无二的,因为它调查了澳大利亚昆士兰州建筑行业中通用和技能领域的当前技能差距。到目前为止,在澳大利亚昆士兰州的背景下,还没有开展工作来确定和讨论二级工业中工作场所学习的主要方法。
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引用次数: 39
Structural, elastic, electronic and optical properties of Cu3MTe4 (M = Nb, Ta) sulvanites — An ab initio study Cu3MTe4 (M = Nb, Ta)硫化矿的结构、弹性、电子和光学性质——从头算研究
Pub Date : 2016-04-20 DOI: 10.1142/S0217979216500892
M. A. Ali, M. Roknuzzaman, M. T. Nasir, A. Islam, S. Naqib
The elastic, electronic, and optical properties of Cu 3 MTe 4 (M = Nb, Ta) are investigated for the first time using the density-functional formalism. The optimized crystal structure is obtained and the lattice parameters are compared with available experimental data. Different elastic moduli are calculated. The Born criteria for mechanicalstability are found to be fulfilled from the estimated values of the elastic moduli, C ij . The band structure and the electronic energy density of states (EDOS) are also determined. The band structure calculations show semiconducting behavior for both the compounds. The theoretically calculated values of the band gaps are found to be strongly dependent on the nature of the functional representing the exchange correlations. Technologically significant optical parameters (e.g., dielectric function, refractive index, absorption coefficient, optical conductivity, reflectivity, and loss function) have been determined. Important conclusions are drawn based on the theoretical findings.
本文首次采用密度泛函形式研究了cu3mte4 (M = Nb, Ta)的弹性、电子和光学性质。得到了优化后的晶体结构,并将晶格参数与现有实验数据进行了比较。计算了不同弹性模量。从弹性模量C ij的估计值可以得到力学稳定性的玻恩准则。测定了能带结构和电子能态密度(EDOS)。能带结构计算表明这两种化合物都具有半导体性质。理论计算的带隙值被发现强烈地依赖于表示交换相关性的函数的性质。技术上重要的光学参数(如介电函数、折射率、吸收系数、光学电导率、反射率和损耗函数)已经确定。根据理论发现得出了重要的结论。
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引用次数: 14
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