资源类型

期刊论文 12

年份

2021 2

2020 2

2019 2

2018 1

2017 1

2015 2

2012 1

2001 1

展开 ︾

关键词

Fuzzy几何规划 1

S-N曲线 1

优选 1

变电所容(数)量 1

无人船；数据回收；水声通信；梯度上升；极值寻找 1

树脂灌注式螺栓 1

疲劳 1

空间信道模型；空口测试；无线线缆；多探头电波暗室；FR2验证 1

经济供电半径 1

结构加强 1

车辆集群；异构性；协同；形式验证；系统模型 1

连接 1

展开 ︾

检索范围：

排序： 展示方式：

Fractional order extremum seeking approach for maximum power point tracking of photovoltaic panels

Ammar NEÇAIBIA,Samir LADACI,Abdelfatah CHAREF,Jean Jacques LOISEAU

《能源前沿（英文）》 2015年 第9卷 第1期   页码 43-53 doi: 10.1007/s11708-014-0343-5

摘要： Due to the high interest in renewable energy and diversity of research regarding photovoltaic (PV) array, a great research effort is focusing nowadays on solar power generation and its performance improvement under various weather conditions. In this paper, an integrated framework was proposed, which achieved both maximum power point tracking (MPPT) and minimum ripple signals. The proposed control scheme was based on extremum-seeking (ES) combined with fractional order systems (FOS). This auto-tuning strategy was developed to maximize the PV panel output power through the regulation of the voltage input to the DC/DC converter in order to lead the PV system steady-state to a stable oscillation behavior around the maximum power point (MPP). It is shown that fractional order operators can improve the plant dynamics with respect to time response and disturbance rejection. The effectiveness of the proposed controller scheme is illustrated with simulations using measured solar radiation data.

关键词： extremum seeking (ES)     fractional order control (FOC)     fractional calculus     photovoltaic (PV) panel     maximum power point tracking (MPPT)    

HTML PDF 收藏

一种用于寻找无人船回收海床基数据最佳通信点的梯度上升控制法 Research Papers

Jiu-cai JIN, Jie ZHANG, Zhi-chao LV

《信息与电子工程前沿（英文）》 2019年 第20卷 第6期   页码 751-759 doi: 10.1631/FITEE.1700732

摘要： 给出了一种在无人船声学回收海床基数据时寻找最佳通信点的控制方法。众所周知，梯度上升极值寻找法常应用于多平台或多智能体，这是因为多平台能大范围测量且易于梯度估计。单一平台测量范围有限，不能快速估计测量场，难以迅速获得测量场极值。本文提出一种无人船振荡运动形式，以获取海床基与无人船间水声通信链路强度数据。基于多元加权线性递归法，利用无人船振荡运动获取的新数据，不断更新水声通信链路强度场。基于梯度上升和人工势场方法，考虑未知场的递归估计，设计无人船最佳通信点控制器，并证明其稳定性。仿真结果表明该算法可靠、高效。

关键词： 无人船；数据回收；水声通信；梯度上升；极值寻找    

HTML PDF 收藏

Unconventional energy: Seeking the ways to innovate energy science and technology

Jing LIU, Zhixiong GUO

《能源前沿（英文）》 2018年 第12卷 第2期   页码 195-197 doi: 10.1007/s11708-018-0568-9

HTML PDF 收藏

经济供电半径的Fuzzy几何规划模型与优选方法

曹炳元

《中国工程科学》 2001年 第3卷 第3期   页码 52-55

摘要：

变电所供电半径的选择是一个复杂的问题。为了确定最佳供电半径，减少投资，降低损耗，建立了Fuzzy环境下的变电所供电半径选择的几何规划模型。它包括软约束问题和含Fuzzy系数的问题。通过数值实例的计算，验证所建立的模型，与静态和动态的优化数学模型如控制模型和经典几何规划模型相比较，包含更多的信息，且获得了更满意的结果。

关键词： Fuzzy几何规划     经济供电半径     优选     变电所容(数)量    

HTML PDF 收藏

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

《结构与土木工程前沿（英文）》 2015年 第9卷 第4期   页码 478-490 doi: 10.1007/s11709-015-0317-7

摘要： This paper presents a simple and efficient approach for predicting the plastic limit loads in cracked plane-strain structures. We use two levels of mesh repartitioning for the finite element limit analysis. The master level handles an adaptive primal-mesh process through a dissipation-based indicator. The slave level performs the subdivision of each triangle into three sub-triangles and constitutes a dual mesh from a pair of two adjacent sub-triangles shared by common edges of the primal mesh. Applying a strain smoothing projection to the strain rates on the dual mesh, the incompressibility constraint and the flow rule constraint are imposed over the edge-based smoothing domains and everywhere in the problem domain. The limit analysis problem is recast into the compact form of a second-order cone programming (SOCP) for the purpose of exploiting interior-point solvers. The present method retains a low number of optimization variables. It offers a convenient way for designing and solving the large-scale optimization problems effectively. Several benchmark examples are given to show the simplicity and effectiveness of the present method.

关键词： cracked structure     limit analysis     von Mises criterion     edge-based strain smoothing     second-order cone programming     adaptive    

HTML PDF 收藏

Evaluation of a novel Asymmetric Genetic Algorithm to optimize the structural design of 3D regular and irregular steel frames

Mohammad Sadegh ES-HAGHI, Aydin SHISHEGARAN, Timon RABCZUK

《结构与土木工程前沿（英文）》 2020年 第14卷 第5期   页码 1110-1130 doi: 10.1007/s11709-020-0643-2

摘要： We propose a new algorithm, named Asymmetric Genetic Algorithm (AGA), for solving optimization problems of steel frames. The AGA consists of a developed penalty function, which helps to find the best generation of the population. The objective function is to minimize the weight of the whole steel structure under the constraint of ultimate loads defined for structural steel buildings by the American Institute of Steel Construction (AISC). Design variables are the cross-sectional areas of elements (beams and columns) that are selected from the sets of side-flange shape steel sections provided by the AISC. The finite element method (FEM) is utilized for analyzing the behavior of steel frames. A 15-storey three-bay steel planar frame is optimized by AGA in this study, which was previously optimized by algorithms such as Particle Swarm Optimization (PSO), Particle Swarm Optimizer with Passive Congregation (PSOPC), Particle Swarm Ant Colony Optimization (HPSACO), Imperialist Competitive Algorithm (ICA), and Charged System Search (CSS). The results of AGA such as total weight of the structure and number of analyses are compared with the results of these algorithms. AGA performs better in comparison to these algorithms with respect to total weight and number of analyses. In addition, five numerical examples are optimized by AGA, Genetic Algorithm (GA), and optimization modules of SAP2000, and the results of them are compared. The results show that AGA can decrease the time of analyses, the number of analyses, and the total weight of the structure. AGA decreases the total weight of regular and irregular steel frame about 11.1% and 26.4% in comparing with the optimized results of SAP2000, respectively.

关键词： optimization     steel frame     Asymmetric Genetic Algorithm     constraints of ultimate load     constraints of serviceability limits     penalty function    

HTML PDF 收藏

Signal promoting role of a p-type transition metal dichalcogenide used for the detection of ultra-trace amounts of diclofenac via a labeled aptasensor

Abdolhamid Hatefi-Mehrjardi, Amirkhosro Beheshti-Marnani, Zarrin Es'haghi

《化学科学与工程前沿（英文）》 2019年 第13卷 第4期   页码 823-831 doi: 10.1007/s11705-019-1797-0

摘要： A -type transition metal dichalcogenide (WS ) was synthesized and hybridized with graphene oxide via a simple hydrothermal method. The as-prepared material was used to modify a glassy carbon electrode for the fabrication of a simple, stable, and repeatable methylene blue-labeled “signal-off” aptasensor used for the sensitive determination of very low amounts of sodium diclofenac (DCF). The synthetic material, modification process, and role of WS in the current response enhancement were studied by X-ray diffraction, energy-dispersive X-ray spectroscopy, field emission scanning electron microscopy, high resolution transmission electron microscopy, Hall effect, cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. Subsequently, a wide linear range of DCF concentration (0.5–300 nmol/L), very low limit of detection (0.23 nmol/L), and good selectivity were obtained using the differential pulse voltammetry method with the assembled aptasensor. Finally, the fabricated aptasensor was successfully developed for physiological real samples with significant recoveries.

关键词： labeled aptasensor     transition metal dichalcogenide     graphene oxide     sodium diclofenac    

HTML PDF 收藏

Ecosystem service tradeoff between traditional and modern agriculture: a case study in Congjiang County, Guizhou Province, China

Dan ZHANG, Qingwen MIN, Moucheng LIU, Shengkui CHENG

《环境科学与工程前沿（英文）》 2012年 第6卷 第5期   页码 743-752 doi: 10.1007/s11783-011-0385-4

摘要： Besides crops, agriculture supplies all three major categories of ecosystem services (ES). However, agriculture also supplies an array of ecosystem dis-services (EDS) that may harm other ecosystems. The flows of ES and EDS are directly dependent on the management of agricultural ecosystems. The traditional method of Chinese agriculture, which supports sustainable agriculture, has been proven to increase ES and reduce EDS. However, there is a lack of a detailed understanding of the ES and EDS associated with traditional agriculture, and also of differences between traditional and modern agriculture. In this study, an investigation was conducted on the ecosystem services (ES) and ecosystem dis-services (EDS) of traditional and modern agriculture in Congjiang County, Guizhou Province, China. Afterwards, the economic values of ES and EDS were quantified experimentally and calculated based on the market price. The results show that: the net economic value of traditional rice-fish agriculture was 3.31×10 CNY·ha (6.83 CNY= 1 USD as of July, 2009) and that of rice monoculture was 1.99×10 CNY·ha . Significant differences existed between traditional rice-fish and rice monoculture fields for their economic values of some ES or EDS. A benefit and cost analysis (BCA) model was used to adjust the conflict between the economic income and environmental loss from traditional and modern agriculture. The BCA model not only calculates the net income but also monetizes the EDS of the agricultural systems. The results showed that the net income of rice-fish agriculture was 1.94×10 CNY·ha higher than that of rice monoculture. However, the benefit to cost ratio (BCR) of rice-fish agriculture was lower than that of rice monoculture, indicating that the traditional agricultural model was not the most optimized choice for farmers. The value of the rice-fish agriculture was much higher than that of the rice monoculture. Thus, when considering the benefits that rice-fish agriculture contributes to the large-scale society, these agricultural methods needs to be utilized. Furthermore, the labor opportunity costs were calculated and the comprehensive value of rice monoculture was negative. Finally, the compensation standard was calculated based on the comprehensive benefit analysis. The lowest level was 1.09×10 CNY·ha , and the highest level was 1.21×10 CNY·ha .

关键词： traditional agriculture     rice-fish agriculture     rice monoculture     benefit and cost analysis (BCA)     ecosystem services (ES)     ecosystem dis-services (EDS)    

HTML PDF 收藏

Restoring soil health to reduce irrigation demand and buffer the impacts of drought

MORREALE, Zhigang LI, Erin MENZIES PLUER, Kirsten KURTZ, Xilu NI, Cuiping WANG, Changxiao LI, Harold VAN ES

《农业科学与工程前沿（英文）》 2020年 第7卷 第3期   页码 339-346 doi: 10.15302/J-FASE-2020348

摘要：

Irrigation consumes three quarters of global water withdrawals each year. Strategies are needed to reduce irrigation water use, including increasing the efficiency of transfer methods and field application. Comprehensive restoration of soil health, specifically through organic matter amendments, can substantially reduce irrigation demand and increase crop yield. A program to restore severely degraded and desertified soils by incorporating coarse woodchips into the soil successfully increased rainfall capture and elevated soil moisture for several weeks between rainfall events at both Ningxia, north-west China and North Dakota, USA. With addition of fertilizer, woodchip incorporation further increased growth of wheat and alfalfa. Comprehensive soil health assessment of remnant grasslands was used to develop target reference soil profiles by which to guide restoration efforts. Given that most agricultural soils are degraded to some degree, soil health restoration can provide a powerful strategy toward achieving global food and water security.

关键词： drought     irrigation     restoration     soil health     woodchips    

HTML PDF 收藏

一种高效的异构车辆集群协同框架 Research Articles

Iftikhar AHMAD1,2,Rafidah Md NOOR2,Zaheed AHMED3,Umm-e-HABIBA3,Naveed AKRAM4, 5,Fausto Pedro GARCÍA MÁRQUEZ6

《信息与电子工程前沿（英文）》 2021年 第22卷 第9期   页码 1247-1259 doi: 10.1631/FITEE.2000260

摘要： 异构车辆集群集成了多种类型通信网络，可在各种车辆应用中高效运行。长期演进（LTE）和专用短程通信的集成是异构网络的一种普遍形式。这种网络基础设施的异构性和成本/数据共享的不合作性是需要解决的潜在问题。车辆集群框架是解决这些问题的一种方案，但是该框架在部署到现实世界前应经过形式验证。为解决这些问题，提出一种异构的车辆集群框架，称为目标和兴趣感知集群框架。该框架集成了车载自组织网络与LTE网络，以提高道路交通效率。在此基础上，给出该框架的模型系统。使用模型检测技术对该模型进行形式验证，在功能层面评估其性能。为在微观层面评估该框架性能，通过整合最先进的工具创建异构仿真环境。仿真结果表明，与其他方法相比，该框架具有更好性能。

关键词： 车辆集群；异构性；协同；形式验证；系统模型    

HTML PDF 收藏

用于毫米波性能空口测试的空间衰落信道重现技术：概念和实验验证

范伟1,Lassi HENTILÄ2,Pekka KYÖSTI2,3

《信息与电子工程前沿（英文）》 2021年 第22卷 第4期   页码 548-559 doi: 10.1631/FITEE.2000484

摘要： 拥有大量可用频谱资源的毫米波（mmWave）频段使得毫米波通信被视为第五代（5G）蜂窝系统的关键使能技术。为使毫米波新无线电（NR）成为现实，工业界和学术界做出了巨大努力。毫米波NR的性能评估和测试是确保毫米波5G NR部署成功的关键和必不可少的步骤。极具吸引力和应用前景的毫米波空口（OTA）辐射测试方法是在实验室条件下模拟实际的传播条件对毫米波设备进行虚拟现场测试。本文首先讨论了在衰落信道条件下毫米波5G NR空口测量的需求和挑战。之后，详细介绍了两种有前景的候选测试解决方案，即无线线缆和多探头电波暗室（MPAC），其中包括这两种方案的原理、对毫米波NR的适用性以及主要挑战。最后展示了这两种测试方案在28 GHz频段下初步的实验验证结果。

关键词： 空间信道模型；空口测试；无线线缆；多探头电波暗室；FR2验证    

HTML PDF 收藏

基于统计分析的树脂灌注式螺栓连接疲劳强度评价

Silva Rebelo, Rui Artur Bartólo Calçada, Luís Alberto Proença Simões

《工程（英文）》 2017年 第3卷 第6期   页码 795-805 doi: 10.1016/j.eng.2017.12.001

摘要：
在对老旧的螺栓和铆接金属桥进行修补和加固时可以使用不同的方案。由于铆接链接技术目前并不常用，连接它需要特定的设备和熟练的工人。另一种解决方案是使用焊接。但是，老旧钢材的可焊性较差。螺栓是一种非常可行的替代解决方案，并且常用于修复旧金属桥。装配螺栓的解决方案成本高昂，另一种方法是使用树脂灌注式螺栓。带有预紧力的树脂灌注式老旧螺栓连接的受力性能已经用准静态和蠕变试验进行了研究，然而，关于这些连接节点的滑移和疲劳行为的文献很少。本文概述了几位研究者的实验项目，旨在评估单侧受剪和双侧受剪的树脂灌注式螺栓连接的疲劳行为。对有预紧力的标准螺栓和有预紧力的树脂灌注式螺栓的连接节点的实验数据进行比较分析，显示后者的疲劳强度较低。但欧洲规范3（EC3）对树脂灌注式螺栓和标准螺栓的连接节点提出的疲劳强度曲线大致相同，这应得到足够的重视。此外，本研究还展示了使用黏结螺栓连接的可行性研究。最后的研究是用高强度低合金结构钢板和用于金属黏结的丙烯酸结构黏结剂进行的。针对两个实际工程案例，使用线性化边界及Castillo 和Fernández-Canteli 模型对疲劳实验数据进行统计分析。最终提出疲劳设计曲线，并与欧洲和北美规范中的几个设计建议进行比较。

关键词： 疲劳     连接     结构加强     S-N曲线     树脂灌注式螺栓    

HTML PDF 收藏

标题 作者 时间 类型 操作

Fractional order extremum seeking approach for maximum power point tracking of photovoltaic panels

Ammar NEÇAIBIA,Samir LADACI,Abdelfatah CHAREF,Jean Jacques LOISEAU

期刊论文

一种用于寻找无人船回收海床基数据最佳通信点的梯度上升控制法

Jiu-cai JIN, Jie ZHANG, Zhi-chao LV

期刊论文

Unconventional energy: Seeking the ways to innovate energy science and technology

Jing LIU, Zhixiong GUO

期刊论文

经济供电半径的Fuzzy几何规划模型与优选方法

曹炳元

期刊论文

Adaptive selective ES-FEM limit analysis of cracked plane-strain structures

H. NGUYEN-XUAN,T. RABCZUK

期刊论文

Evaluation of a novel Asymmetric Genetic Algorithm to optimize the structural design of 3D regular and irregular steel frames

Mohammad Sadegh ES-HAGHI, Aydin SHISHEGARAN, Timon RABCZUK

期刊论文

Signal promoting role of a p-type transition metal dichalcogenide used for the detection of ultra-trace amounts of diclofenac via a labeled aptasensor

Abdolhamid Hatefi-Mehrjardi, Amirkhosro Beheshti-Marnani, Zarrin Es'haghi

期刊论文

Ecosystem service tradeoff between traditional and modern agriculture: a case study in Congjiang County, Guizhou Province, China

Dan ZHANG, Qingwen MIN, Moucheng LIU, Shengkui CHENG

期刊论文

Restoring soil health to reduce irrigation demand and buffer the impacts of drought

MORREALE, Zhigang LI, Erin MENZIES PLUER, Kirsten KURTZ, Xilu NI, Cuiping WANG, Changxiao LI, Harold VAN ES

期刊论文

一种高效的异构车辆集群协同框架

Iftikhar AHMAD1,2,Rafidah Md NOOR2,Zaheed AHMED3,Umm-e-HABIBA3,Naveed AKRAM4, 5,Fausto Pedro GARCÍA MÁRQUEZ6

期刊论文

用于毫米波性能空口测试的空间衰落信道重现技术：概念和实验验证

范伟1,Lassi HENTILÄ2,Pekka KYÖSTI2,3

期刊论文

基于统计分析的树脂灌注式螺栓连接疲劳强度评价

Silva Rebelo, Rui Artur Bartólo Calçada, Luís Alberto Proença Simões

期刊论文