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2018 4th International Conference on Green Technology and Sustainable Development (GTSD)最新文献

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Design of a Bistable Mechanism for Symmetric Force Output 对称力输出双稳态机构的设计
T. Ngo, N. Tran, Dung-An Wang
A compliant bistable mechanism (CBM) for symmetric force output in the forward and backward directions is developed. Effects of design parameters on the force-displacement characteristics of the bistable mechanism are identified. The performance of the mechanism is confirmed by experiments. Such a mechanism can be applied in nonvolatile memory devices with two logical levels “1” and “0” assigned to the two stable states which are separated by nearly equal switching forces in back and forth directions.
提出了一种适用于正向和反向对称力输出的柔性双稳机构。确定了设计参数对双稳机构力-位移特性的影响。实验验证了该机构的性能。这种机制可以应用于具有两个逻辑级别“1”和“0”的非易失性存储器器件中,这两个稳定状态被前后方向上几乎相等的开关力分开。
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引用次数: 0
A Cell-based MITC3+ Flat Shell Element for Frequency Analyses of Plates and Shells Using Substructuring Methods 基于单元的MITC3+平壳单元用于板壳频率分析
T. Chau-Dinh, H. Vo-Ngoc, Jin-Gyun Kim
A cell-based three-node triangular flat shell element with a bubble node is introduced to analyze frequencies of plates and shells. By smoothing the in-plane strains on sub-triangular domains created by connecting the bubble node to element nodes and applying the divergence theorem to derivatives in the gradient matrices, the integration of corresponding stiffness matrices are transformed from surface to line integrals. To remove the shear locking, the MITC3+ technique for three-node triangular degenerated shell elements with a bubble node is employed. The Craig-Bampton (CB) and enhanced Craig-Bampton (ECB) methods, which are well-known reduced-order modeling techniques based on substructuring strategy, are used for efficiently solving frequency analyses. Numerical results demonstrate the reliability and superiority of the present element, called CS-MITC3+, when combined with the substructuring methods to compute frequencies of plate and shell structures.
提出了一种基于单元的带气泡节点的三节点三角形平壳单元,用于板壳频率分析。通过将气泡节点与单元节点连接形成的子三角形域上的面内应变进行平滑处理,并将散度定理应用于梯度矩阵的导数,将相应刚度矩阵的积分由曲面积分转化为线积分。为了消除剪切锁紧,采用MITC3+技术对带有气泡节点的三节点三角形简并壳单元进行处理。Craig-Bampton (CB)和增强Craig-Bampton (ECB)方法是众所周知的基于子结构策略的降阶建模技术,用于有效地求解频率分析。数值结果表明,CS-MITC3+单元结合子结构法计算板壳结构频率的可靠性和优越性。
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引用次数: 0
Comparison of Stress Field and Strut-and-Tie Analyses 应力场与拉系分析的比较
J. Navrátil, Bao Dang Tran
Strut-and-Tie and Stress Field Methods can be used for the design of discontinuity regions of reinforced concrete members such as deep beams, diaphragms, walls, brackets, areas around opening, anchorage zones, etc. Strut-and-Tie Method is widely used in today’s practice for hand calculations or it is frequently implemented in single-purpose programs or Excel design sheets. It is simple to use with clear link-up with contemporary national standards, but it is limited to the verification of Ultimate Limit State. Above that, the author’s experience is that even professionals have inadequate knowledge of the main principles for the creation of the models in cases of atypical details. Simplified assumptions of Stress Field Method are similar to the ones used in hand calculations, but the method is improved to allow ductility and Serviceability Limit State verifications. Stress Field Method can be seen as a generalized Strut-and-Tie Method, in which 2D members with stresses instead of force resultants are considered. The method is based on clear material properties and strength criteria corresponding with the ones used in national codes and regulations. Despite the obvious benefits, the method is not as widely used in common practice as Strut-and-Tie Method. To demonstrate the potential of Stress Field Method, the assessment of well-known example of deep beam with a large opening was performed using both methods in Eurocode context. The results of both analyses were compared. The influence of (i) detailing and (ii) model parameters was investigated with respect to ultimate load and mode of failure. The study has shown (i) wider possibilities to proof structural safety and reliability than the Strut-and-Tie Method would allow, and (ii) an excellent agreement of the results in the checks viable by both methods.
拉杆法和应力场法可用于钢筋混凝土构件不连续区域的设计,如深梁、横膈膜、墙体、托架、开口周围区域、锚固区等。在今天的实践中,strutand - tie方法被广泛用于手工计算,或者它经常在单一用途的程序或Excel设计表中实现。它使用简单,与当代国家标准有明确的联系,但仅限于极限状态的验证。除此之外,作者的经验是,即使是专业人员,在非典型细节的情况下,对创建模型的主要原则的知识也不足。应力场法的简化假设类似于手工计算,但该方法进行了改进,以允许延性和可用性极限状态验证。应力场法可以看作是一种广义的拉杆法,它考虑的是具有应力而不是力合力的二维构件。该方法以明确的材料性能和强度标准为基础,与国家规范和规定相对应。尽管有明显的好处,但在常规实践中,该方法并没有像支柱-连接方法那样广泛使用。为了证明应力场法的潜力,在欧洲规范背景下,使用这两种方法对著名的大开口深梁进行了评估。比较两种分析的结果。研究了(i)细部和(ii)模型参数对极限荷载和破坏模式的影响。该研究表明(i)证明结构安全性和可靠性的可能性比撑杆法更大,(ii)两种方法可行的检查结果非常一致。
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引用次数: 0
IoT-Based Smart Plug-In Device for Home Energy Management System 基于物联网的家庭能源管理系统智能插件装置
T. Nguyen, Viet Khang Tran, Tan Duy Nguyen, N. Le, M. Le
Identification of in-home electrical appliances is an important task for the home energy management system in order to surveillance and control the home electrical usage. In this paper, we propose a Smart Plug device prototype that can that can recognize the type of electric appliances according to the measured voltage, current and power factor. Our device includes two modules. The power interface with the appliance is based on the voltage and current sensors connected to the Arduino Uno. The processing module uses the machine learning approaches such as neural network or K Nearest Neighborhood (KNN) to recognize the electrical appliances plugged into in real time. All of the recognized in-home appliances datasets then can be uploaded to the home energy management system for further applications. For instance, the system gives a warning message to the user when the appliance has an unusual power factor or an outlier in power consumption. This warning is sent via email or mobile phone. Compare to other commercial smart plug devices, our device has more functionalities at a low price.
家用电器的识别是家庭能源管理系统的一项重要任务,目的是对家庭用电情况进行监控和控制。在本文中,我们提出了一个智能插头设备原型,它可以根据测量的电压、电流和功率因数来识别电器的类型。我们的设备包括两个模块。与设备的电源接口基于连接到Arduino Uno的电压和电流传感器。处理模块使用神经网络或K近邻(KNN)等机器学习方法实时识别插入的电器。然后,所有被认可的家用电器数据集都可以上传到家庭能源管理系统,以供进一步应用。例如,当设备的功率因数不正常或功耗异常时,系统会向用户发出警告信息。该警告通过电子邮件或手机发送。与其他商用智能插头设备相比,我们的设备以更低的价格拥有更多的功能。
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引用次数: 8
Improved Control Scheme for Low Voltage Ride-Through of PMSG-based Wind Energy Conversion Systems 基于pmsg的风能转换系统低压穿越的改进控制方案
Tan Luong Van, T. Truong, M. T. Cao, Phu Cong Nguyen, H. Nguyen
This paper proposes a low-voltage ride-through (LVRT) scheme for the permanent magnet synchronous generator (PMSG) wind turbine system under grid voltage sags by exchanging of the control roles of the two converters and using the braking chopper (BC). The DC-link voltage is controlled at the machine-side converter (MSC) by applying the sliding mode control instead of the grid-side converter (GSC). The GSC regulates the grid active power for a maximum power point tracking (MPPT). The validity of this control algorithm has been verified by the simulation of the 2[MW]-PMSG wind turbine system.
本文通过交换两个变流器的控制角色并使用制动斩波器(BC),提出了电网电压下降情况下永磁同步发电机(PMSG)风力发电系统的低压穿越(LVRT)方案。直流链路电压在机器侧变换器(MSC)通过应用滑模控制代替电网侧变换器(GSC)进行控制。GSC调节电网有功功率,实现最大功率点跟踪(MPPT)。通过对2[MW]-PMSG风力发电机组系统的仿真验证了该控制算法的有效性。
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引用次数: 2
Impact of Ancillary Services and Its Prices on Large-Scale Solar and Wind Power Penetration in Electricity Market 电力市场中辅助服务及其价格对太阳能和风能大规模渗透的影响
Dinh Thanh Viet, Phan Cong Tien
Nowadays, solar and wind power generation is an important part of the power sources in many countries all over the world. However, due to the variability and uncertainty of these sources, stable operation of the power system with large solar and wind power penetration is a big challenge for system operators. In order to enhance the contribution efficiency of solar and wind power in the power market, a strong ancillary service system is essential and must be reasonable priced. The ancillary services considered in this paper are spinning reserve, non-spinning reserve. In addition, a model for calculating and comparing generation costs for energy and ancillary services, with and without penetration of solar and wind power in the power market have been proposed. Consequently, this model has been developed and validated with a case study. The results show that in a power system with large proportion integration of solar and wind power, the energy and ancillary services generation costs for the power system are high. Besides, the feed-in tariffs of solar and wind power are more expensive than the traditional electricity generation, which leads to high locational marginal prices of the electricity market.
目前,太阳能和风能发电已成为世界上许多国家能源的重要组成部分。然而,由于这些来源的可变性和不确定性,太阳能和风能大量渗透的电力系统的稳定运行对系统运营商来说是一个很大的挑战。为了提高太阳能和风能在电力市场上的贡献效率,一个强大的辅助服务体系是必不可少的,必须合理定价。本文考虑的辅助服务有纺纱储备、非纺纱储备。此外,还提出了一种计算和比较能源和辅助服务的发电成本的模型,不论是否在电力市场上使用太阳能和风能。因此,该模型已经开发并通过案例研究进行了验证。结果表明,在太阳能和风能并网比例较大的电力系统中,电力系统的能源和辅助服务发电成本较高。此外,太阳能和风能发电的上网电价高于传统发电,这导致了电力市场的高区位边际价格。
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引用次数: 1
Hybrid PVK: OXD-7: QDs Emitting Layer for High Color Purified Quantum Dot Light Emitting-Diode 混合PVK: OXD-7:高色纯量子点发光二极管的量子点发射层
Hoang-Tuan Vu, Chih-Chiang Yang, Ba-Son Nguyen, Y. Su
In this paper, we proposed a novel hybrid quantum dot emitting layer (QD EML) for the efficient quantum dot light-emitting diodes (QLEDs). This proposed hybrid emitting layer consisted of a composite polymer with poly (9-vinlycarbazole) (PVK) and 1,3-bis[(4-tert-butylphenyl)-1,3,4oxadiazolyl]phenylene (OXD-7) in the weight ratio of 7:3 and high quantum yield CdSe@ZnS/ZnS quantum dots. By using PVK as hole transport and OXD-7 as electron transport polymer, both hole and electron was supported to inject into QD efficiently. Consequently, the maximum current efficiencies of 7.9 cd/A was achieved in QLEDs with the hybrid EML, which was $sim 250$ % improvement over the bared EML-device. Moreover, high color purity and wavelength stable green QLEDs with peak wavelength of 536 nm was also obtained.
本文提出了一种用于高效量子点发光二极管(qled)的新型混合量子点发光层(QD EML)。该杂化发光层由聚(9-乙烯咔唑)(PVK)和1,3-双[(4-叔丁基苯基)-1,3,4恶二唑]苯基(OXD-7)的复合聚合物组成,质量比为7:3,具有高量子产率CdSe@ZnS/ZnS量子点。利用PVK作为空穴输运,OXD-7作为电子输运聚合物,支持空穴和电子同时注入量子点。因此,使用混合EML的qled实现了7.9 cd/A的最大电流效率,比裸EML器件提高了250 %。此外,还获得了高色纯度和波长稳定的绿色qled,峰值波长为536 nm。
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引用次数: 0
Innovation Policy for Sustainable Development of SMEs in Benin 贝宁中小企业可持续发展的创新政策
Judicael Paterne Raoul Tokognon, Shao Yunfei
Developing countries in general, and Benin, in particular, depend seriously on the private sector for economic growth. Moreover, SMEs control their private sector. Therefore, it is emerging to think of new policies that can help sustain the growth of SMEs in developing countries for a better economy. Thus, innovation, being paramount irrespective of any enterprise size, appears to be the cornerstone to achieve economic growth with SMEs. This paper, with Benin as a sample size, aims to provide guidelines for state government to design sustainable development policies for SMEs, providing three main contributions. First, this work proposes a new formula together with a conceptual model for an attempt to well define SMEs. Second, this study investigates the challenges of Benin SMEs across the factors; Funding, Politics, Firm Management, and innovation capabilities. Finally, guidelines for innovation policies are proposed to sustain SMEs growth. To improve its economy, Benin should design and implement excellent and realistic innovation policies to sustain SMEs growth.
一般发展中国家,特别是贝宁,严重依赖私营部门的经济增长。此外,中小企业控制着它们的私营部门。因此,人们开始考虑新的政策,以帮助发展中国家的中小企业保持增长,以实现更好的经济。因此,无论企业规模大小,创新都是最重要的,似乎是中小企业实现经济增长的基石。本文以贝宁为样本,旨在为国家政府设计中小企业可持续发展政策提供指导,主要有三个贡献。首先,本文提出了一个新的公式和一个概念模型,试图更好地定义中小企业。其次,本研究跨因素考察了贝宁中小企业面临的挑战;资金、政治、企业管理和创新能力。最后,提出了促进中小企业持续增长的创新政策指导方针。为了改善经济,贝宁应该设计和实施优秀而现实的创新政策,以维持中小企业的增长。
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引用次数: 3
Put Forth a Conceptual Model about Corporate Social Responsibility in Tourism in Ho Chi Minh City 提出胡志明市旅游企业社会责任概念模型
Nguyen Thi Thanh Van, Nguyen Thien Duy
When Bowen introduced definition of corporate social responsibility (CSR) in 1953, it has attracted many researchers in both theoretical and applied research. Business managers recognized that when their companies do CSR, they create a better image in the community and are more well-known than their competitors, therefrom increasing their business performance. However, CSR has become widespread in developed nations but in developing ones like Vietnam, it is a relatively new concept that has not caught much public attention. This paper therefore put forth a conceptual model of CSR for tourist companies in Vietnam. This model shows the relationship between CSR, firm reputation and firm performance. From the proposed model, the following studies may continue to using this model to survey to reinforce its value.
1953年Bowen提出企业社会责任(CSR)这一概念后,引起了理论界和实践界的广泛关注。企业管理者认识到,当他们的公司做CSR时,他们在社会上创造了更好的形象,比他们的竞争对手更知名,从而提高了他们的经营业绩。然而,企业社会责任在发达国家已经普及,但在越南等发展中国家,这是一个相对较新的概念,并没有引起公众的太多关注。因此,本文提出了越南旅游企业社会责任的概念模型。该模型展示了企业社会责任、企业声誉和企业绩效之间的关系。根据提出的模型,后续研究可以继续使用该模型进行调查,以增强其价值。
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引用次数: 0
Environmental Condition Dependent Electrical Resistivity of High Performance Fiber-Reinforced Concretes* 环境条件下高性能纤维增强混凝土电阻率的研究*
Duy‐Liem Nguyen
High-performance fiber-reinforced concretes (HPFRCs), including ultra-high-performance fiber-reinforced concretes (UHPFRCs) refers to smart construction materials those can monitor themselves by determining their electrical resistivity under loading, i.e., the electrical resistivity importantly governs the such smart property of HPFRCs. In this research work, the influences of environmental condition on the electrical resistivity of HPFRCs were experimentally reported. The electrical resistivities of HPFRCs were measured under controlled temperature and relative humidity using a chamber machine. As the temperature or relative humidity increased, the electrical resistivity of the studied HPFRCs clearly decreased. The electrical resistivities of cement-based composites were generally dependent much upon temperature and relative humidity.
高性能纤维增强混凝土(HPFRCs),包括超高性能纤维增强混凝土(UHPFRCs)是指能够通过确定其在荷载作用下的电阻率来监测自身的智能建筑材料,即电阻率在很大程度上决定了HPFRCs的智能性能。实验研究了环境条件对HPFRCs电阻率的影响。在控制温度和相对湿度的条件下,利用室内测定仪测量了HPFRCs的电阻率。随着温度或相对湿度的增加,所研究的HPFRCs的电阻率明显降低。水泥基复合材料的电阻率主要取决于温度和相对湿度。
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引用次数: 0
期刊
2018 4th International Conference on Green Technology and Sustainable Development (GTSD)
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