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| 1 | A wireless solution for greenhouse monitoring and control system based on ZigBee technology显示文摘With the rapid development of wireless technologies, it is possible for Chinese greenhouses to be equipped with wireless sensor networks due to their low-cost, simplicity and mobility. In the current study, we compared the advantages of ZigBee with other two similar wireless networking protocols, Wi-Fi and Bluetooth, and proposed a wireless solution for green- house monitoring and control system based on ZigBee technology. As an explorative application of ZigBee technology in Chinese greenhouse, it may promote Chinese protected agriculture. | ZHANG Qian YANG Xiang-long ZHOU Yi-ming WANG Li-ren GUO Xi-shan | 2007 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007，8，10： | 60 |
| 2 | Model predictive control for adaptive cruise control with multi-objectives: comfort,fuel-economy,safety and car-following显示文摘For automated vehicles,comfortable driving will improve passengers’ satisfaction.Reducing fuel consumption brings economic profits for car owners,decreases the impact on the environment and increases energy sustainability.In addition to comfort and fuel-economy,automated vehicles also have the basic requirements of safety and car-following.For this purpose,an adaptive cruise control (ACC) algorithm with multi-objectives is proposed based on a model predictive control (MPC) framework.In the proposed ACC algorithm,safety is guaranteed by constraining the inter-distance within a safe range; the requirements of comfort and car-following are considered to be the performance criteria and some optimal reference trajectories are introduced to increase fuel-economy.The performances of the proposed ACC algorithm are simulated and analyzed in five representative traffic scenarios and multiple experiments.The results show that not only are safety and car-following objectives satisfied,but also driving comfort and fuel-economy are improved significantly. | Li-hua LUO Hong LIU Ping LI Hui WANG | 2010 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2010，11，3： | 34 |
| 3 | 2000–2020年中国氮氧化物排放清单及排放趋势(英文)显示文摘研究目的:建立2000–2020年中国氮氧化物排放清单,了解中国主要行业和省份氮氧化物的排放情况,为评估氮氧化物的环境影响和制定相关减排政策提供依据。创新要点:分析了中国主要省份产业结构对氮氧化物排放量的影响;根据不同情景分析,预测2020年中国氮氧化物的排放量。研究方法:1.基于自底向上法,根据不同类型化石燃料的氮氧化物排放因子,结合化石燃料消耗量,建立中国2000–2010年氮氧化物排放清单;2.基于IPAT方程,并以中国2000–2010年的国内生产总值增长数据和氮氧化物排放量为依据,分三种情景,分析2011–2020年中国能源消耗和氮氧化物排放趋势。重要结论:2010年中国氮氧化物的排放量约是2000年的两倍;自2009年起,中国氮氧化物总排放量超过了二氧化硫总排放量;主要由于产业结构和地区生产总值的不同,中国东部和西部氮氧化物排放量有明显差异;制造业、电力行业和交通运输业是中国氮氧化物的主要排放源,其中交通运输业氮氧化物排放量呈现逐年增长趋势;预计2020年中国氮氧化物排放量为19.7 Mt。 | Yun SHI Yin-feng XIA Bi-hong LU Nan LIU Lei ZHANG Su-jing LI Wei LI | 2014 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2014，15，6： | 34 |
| 4 | An efficient enhanced k-means clustering algorithm显示文摘In k-means clustering, we are given a set of n data points in d-dimensional space úd and an integer k and the problem is to determine a set of k points in úd, called centers, so as to minimize the mean squared distance from each data point to its nearest center. In this paper, we present a simple and efficient clustering algorithm based on the k-means algorithm, which we call en- hanced k-means algorithm. This algorithm is easy to implement, requiring a simple data structure to keep some information in each iteration to be used in the next iteration. Our experimental results demonstrated that our scheme can improve the computational speed of the k-means algorithm by the magnitude in the total number of distance calculations and the overall time of computation. | FAHIM A.M SALEM A.M TORKEY F.A RAMADAN M.A | 2006 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2006，7，10： | 28 |
| 5 | Hybrid discrete particle swarm optimization algorithm for capacitated vehicle routing problem显示文摘Capacitated vehicle routing problem (CVRP) is an NP-hard problem. For large-scale problems, it is quite difficult to achieve an optimal solution with traditional optimization methods due to the high computational complexity. A new hybrid ap- proximation algorithm is developed in this work to solve the problem. In the hybrid algorithm, discrete particle swarm optimiza- tion (DPSO) combines global search and local search to search for the optimal results and simulated annealing (SA) uses certain probability to avoid being trapped in a local optimum. The computational study showed that the proposed algorithm is a feasible and effective approach for capacitated vehicle routing problem, especially for large scale problems. | CHEN Ai-ling YANG Gen-ke WU Zhi-ming | 2006 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2006，7，4： | 26 |
| 6 | Critical review in adsorption kinetic models显示文摘Adsorption is one of the most widely applied techniques for environmental remediation. Its kinetics are of great significance to evaluate the performance of a given adsorbent and gain insight into the underlying mechanisms. There are lots of references available concerning adsorption kinetics, and several mathematic models have been developed to describe adsorption reaction and diffusion processes. However, these models were frequently employed to fit the kinetic data in an unsuitable or improper manner. This is mainly because the boundary conditions of the associated models were, to a considerable extent, ignored for data modeling. Here we reviewed several widely-used adsorption kinetic models and paid more attention to their boundary conditions. We believe that the review is of certain significance and improvement for adsorption kinetic modeling. | Hui QIU Lu LV Bing-cai PAN Qing-jian ZHANG Wei-ming ZHANG Quan-xing ZHANG | 2009 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2009，10，5： | 26 |
| 7 | Personal Review:Sources of sulfide in waste streams and current biotechnologies for its removal显示文摘Sulfide-containing waste streams are generated by a number of industries. It is emitted into the environment as dis- solved sulfide (S2- and HS-) in wastewaters and as H2S in waste gases. Due to its corrosive nature, biological hydrogen sulfide removal processes are being investigated to overcome the chemical and disposal costs associated with existing chemically based removal processes. The nitrogen and sulfur metabolism interacts at various levels of the wastewater treatment process. Hence, the sulfur cycle offers possibilities to integrate nitrogen removal in the treatment process, which needs to be further optimized by appropriate design of the reactor configuration, optimization of performance parameters, retention of biomass and optimization of biomass growth. The present paper reviews the biotechnological advances to remove sulfides from various environments. | MAHMOOD Qaisar ZHENG Ping CAI Jing HAYAT Yousaf HASSAN Muhammad Jaffar WU Dong-lei HU Bao-lan | 2007 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007，8，7： | 22 |
| 8 | Dynamic simulation and optimal control strategy for a parallel hybrid hydraulic excavator显示文摘The primary focus of this study is to investigate the control strategies of a hybrid system used in hydraulic excavators. First, the structure and evaluation target of hybrid hydraulic excavators are analyzed. Then the dynamic system model including batteries, motor and engine is built as the simulation environment to obtain control results. A so-called multi-work-point dynamic control strategy, which has both closed-loop speed PI (proportion integral) control and direct torque control, is proposed and studied in the simulation model. Simulation results indicate that the hybrid system with this strategy can meet the power demand and achieve better system stability and higher fuel efficiency. | Xiao LIN Shuang-xia PAN Dong-yun WAN | 2008 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2008，9，5： | 23 |
| 9 | Output speed and flow of double-acting double-stator multi-pumps and multi-motors显示文摘The primary focus of this study was to investigate a series of novel motors and pumps,based on a new type of structure called double-stator.The double-stator structure can be used as pump or motor just based on the application requirements.A certain amount of pumps or motors can be formed in one shell,and these sub-pumps or sub-motors can work alone or be combined without influence on each other.So this kind of double-stator pump(motor) is called a multi-pump(multi-motor).Through the analysis of multifarious connection modes of the double-acting double-stator multi-pumps and multi-motors,the mathematical expressions of the output flow rate and the rotational speed are acquired.The results indicate that a quantity of different flow rates can be provided by one fixed-displacement multi-pump under the condition of unalterable driven speed by electromotor.Likewise,when supplied by settled input flow,without complex variable mechanism,the functions of double-speed,multiple-speed,and even differential connection can be obtained by employing the use of a double-stator multi-motor.The novel hydraulic transmission is made of such a double-stator multi-pump and multi-motor,and has broad application prospects. | De-sheng WEN Zhi-li WANG Jun GAO Yong ZHANG Shi-jun LV Tetsuhiro TSUKIJI | 2011 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2011，12，4： | 23 |
| 10 | 高速铁路运营过程中的关键问题:轮轨磨耗等(英文)显示文摘随着高速铁路运营里程和列车运营速度的不断增长,出现了一些和列车轨道耦合大系统密切相关的关键科学和技术问题。这些问题不仅影响到列车的运行品质,甚至威胁到安全运行,是当前高速铁路运用和发展中急需解决的问题。本文系统描述了高速铁路在运营过程中所出现的一些关键科学和技术问题,并述评了全世界有关这些问题的研究进展、现状和不足之处,提出了今后有利于认识和解决这些问题的发展方向。在长期高速运营的铁路大系统环境中,这些问题的形成的机理、发生、发展过程和预防措施的研究,需要从列车/轨道耦合大系统运营环境(速度、路况、气候和运用维修)、系统的自身参数匹配、材料选用和运营成本等全面系统考虑,并从理论、技术、工艺、监控和维修等方面解决。 | Xue-song JIN | 2014 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2014，15，12： | 22 |
| 11 | Optimization of cross angle based on the pumping dynamics model显示文摘The single cylinder and multi-cylinder pumping dynamics model of a swash plate piston pump were improved.Particular attention has been paid to the design influences of key parts of the valve plate such as relief groove,pre-compression/ expansion and fluid inertia effect of the unsteady flow.Some important parameters,such as the discharge area,discharge coefficient,fluid bulk modulus,were especially analyzed using numerical methods or by experiment-based estimation.Consequently,the mathematical results of pressure pulsation and flow ripple agree well with experimental results from the test-rig of the flow ripple.Therefore,the cross angle and the pre-compression angle of the valve plate was optimized,based on the pumping dynamics model.Considering both the flow ripple and the cylinder pressure of the pump,the cross angle is set to be 2.2° to 2.7° with a pre-compression angle of 1.7° to 2.2°,so the pumping dynamics character can obtain the best result. | Ji-en MA You-tong FANG Bing XU Hua-yong YANG | 2010 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2010，11，3： | 21 |
| 12 | Surface settlement caused by twin-parallel shield tunnelling in sandy cobble strata显示文摘City metro tunnels are usually constructed as twin-parallel tunnels and their adjacent construction may lead to surface deformation,affecting the surface environment and the safety of the tunnels.Due to its strong dispersion,sandy cobble strata can be easily disturbed by shield tunneling.Based on the project of the Chengdu Metro Line 1,field and model tests were carried out to study the surface settlement caused by shield tunneling in sandy cobble strata by measuring surface settlement curves,ground loss ratios and construction influence zones.The discrete element method(DEM) was used to study the factors affecting the formation of ground arches in sandy cobble strata at the microscopic level.Results show that the shape of the surface settlement curve in sandy cobble strata is different from that in soft soil.The buried depth and clear spacing of the two tunnels had a significant impact on the formation of ground arches. | Chuan HE Kun FENG Yong FANG Ying-chao JIANG | 2012 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2012，13，11： | 21 |
| 13 | 钢轨波磨处高速轮轨滚动接触行为与波磨发展的模拟研究(英文)显示文摘研究目的:为求解钢轨(短波)波磨处的高速轮轨瞬态滚动接触建立有限元模型,研究影响高速钢轨波磨发展的重要因素。创新要点:1.求解不同牵引条件下轮轨间的瞬态法和切向滚动接触问题,并考虑真实轮轨几何和钢轨波磨,最高模拟速度达500 km/h;2.基于模拟结果,解释了中国高速线路上发现的钢轨波磨很快稳定下来的现象。研究方法:1.详细分析钢轨波磨处高速轮轨瞬态滚动接触的法、切向解以及由此导致的V-M等效应力和摩擦功沿轨面的波动;2.变化波磨波长、波深及重要滚动参数如速度和牵引系数等,研究它们对波磨处滚动接触行为的影响;3.对比上述有限元模型与传统多体动力模型在波磨处的法向轮轨力结果。重要结论:1.法、切向轮轨力及法、切向接触应力均随着波磨几何呈周期性波动,但相位略有差异,V-M等效应力和摩擦功的波动形式接近切向接触应力;2.牵引系数越大,波磨处V-M等效应力和摩擦功的波动范围越大;3.名义参数下,对于所研究高铁系统,波长为80 mm左右、速度为250–300 km/h时波磨的动态响应最大,这与现场观测相符;4.传统多体动力模型会高估钢轨波磨激励的法向轮轨力;5.钢轨波磨会逐渐稳定下来,通过速度越高进入稳定越快。 | Xin ZHAO Ze-feng WEN Heng-yu WANG Xue-song JIN Min-hao ZHU | 2014 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2014，15，12： | 20 |
| 14 | 流体动力工程研究综述(英文)显示文摘本综述详细介绍近年来流体传动技术的发展现状,特别是该学科在中国的研究开展现状以及应用市场。同时详细讨论液压泵、阀及执行元件的发展与新技术,以及液压惯性切换系统和液压四足机器人两个典型的现代流体传动系统。并从液压系统效率、集成一体化、系统清洁和流体传动学科教育四个方面讨论当前研究人员所面临的挑战,并提出相关建议。 | Hua-yong YANG Min PAN | 2015 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2015，16，6： | 20 |
| 15 | Experimental analysis of the mechanism of high-order polygonal wear of wheels of a high-speed train显示文摘目的:通过试验研究,对高速列车车轮多边形磨耗机理进行初步探究。创新点:以试验方法为基础,跟踪调查车轮多边形磨耗的发展规律,然后分别对轨道系统和车辆系统开展现场试验,对导致车轮发生多边形磨耗的因素进行排查,探明了车轮多边形磨耗的机理。方法:1.进行车轮多边形磨耗跟踪测试;2.进行轨道结构模态特性测试、钢轨波磨测试和轨道振动响应测试;3.进行转向架模态特性仿真研究、悬挂系统隔振特性测试以及车辆振动特性跟踪测试。结论:1.列车运行时,车轮受到周期性激励作用会发生多边形磨耗,且当激励波长整分车轮周长时,多边形磨耗发展迅速;2.作为主要激励源,轮轨接触表面出现的车轮偏心、钢轨表面不平顺、轨下支承不均匀、钢轨接头和道岔等激发了转向架系统在550~600 Hz频段内的模态耦合共振,从而导致了车轮多边形磨耗的产生;3.变速运行可以有效地控制车轮多边形磨耗的产生与发展。 | Yue WU Xing DU He-ji ZHANG Ze-feng WEN Xue-song JIN | 2017 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2017，18，8： | 20 |
| 16 | Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions显示文摘This paper presents a unified positive-and negative-sequence dual-dq dynamic model of wind-turbine driven doubly-fed induction generator(DFIG) under unbalanced grid voltage conditions. Strategies for enhanced control and operation of a DFIG-used back-to-back(BTB) PWM voltage source converter(VSC) are proposed. The modified control design for the grid-side converter in the stationary αβ frames diminishes the amplitude of DC-link voltage ripples of twice the grid frequency,and the two proposed control targets for the rotor-side converter are alternatively achieved,which,as a result,improve the fault-ride through(FRT) capability of the DFIG based wind power generation systems during unbalanced network supply. A complete unbalanced control scheme with both grid-and rotor-side converters included is designed. Finally,simulation was carried out on a 1.5 MW wind-turbine driven DFIG system and the validity of the developed unified model and the feasibility of the proposed control strategies are all confirmed by the simulated results. | HU Jia-bing HE Yi-kang NIAN Heng | 2007 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007，8，8： | 20 |
| 17 | Water quality forecast through application of BP neural network at Yuqiao reservoir显示文摘This paper deals with the study of a water quality forecast model through application of BP neural network technique and GUI (Graphical User Interfaces) function of MATLAB at Yuqiao reservoir in Tianjin. To overcome the shortcomings of traditional BP algorithm as being slow to converge and easy to reach extreme minimum value,the model adopts LM (Leven-berg-Marquardt) algorithm to achieve a higher speed and a lower error rate. When factors affecting the study object are identified,the reservoir's 2005 measured values are used as sample data to test the model. The number of neurons and the type of transfer functions in the hidden layer of the neural network are changed from time to time to achieve the best forecast results. Through simulation testing the model shows high efficiency in forecasting the water quality of the reservoir. | ZHAO Ying NAN Jun CUI Fu-yi GUO Liang | 2007 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007，8，9： | 20 |
| 18 | Effectiveness of urban construction boundaries in Beijing:an assessment显示文摘Based on the remote sensing (RS) and geographic information system (GIS) analysis of the Landsat multispectral scanner (MSS) and thematic mapper (TM) satellite images of 1983, 1993, and 2005, the present research examined the effectiveness of the urban construction boundaries (UCBs) in containing urban growth within the 6th Ring Road of Beijing Municipality. Three indicators on boundary control were proposed, through which the effectiveness of boundary containment, land inventory sufficiency and illegal adjacent development to the UCBs were explored. The results suggested that, first, the UCBs were limited in effectiveness in containing urban growth; second, the area encompassed by the UCBs might not be designed large enough to accommodate new development. The frustration of the urban growth control through the UCBs mainly resulted from the lack of a transparent system for urban land use planning and control to provide sufficient information, the limitation of the traditional land use prediction method to consider contingencies, and the absence of a mechanism to monitor and adjust the UCBs to respond just in time to urban change. | Hao-ying HAN Shih-Kung LAI An-rong DANG Zong-bo TAN Ci-fang WU | 2009 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2009，10，9： | 20 |
| 19 | Application of polyurethane geocomposites to help maintain track geometry for high-speed ballasted railway tracks显示文摘There are many issues surrounding the performance of critical assets on high-speed ballasted railway lines.At assets like switch & crossings and bridge transitions high track forces can be produced resulting in higher ballast settlements and hence track misalignments.The latter result in higher track forces and hence more settlement,leading to the need for increased track maintenance to ensure comfort and safety.Current technologies for solving issues like ballast movement under high-speed loading regimes are limited.However,a technique that has been well used across the UK and now increasingly overseas to stabilise and reinforce ballasted railway tracks is the application of in-situ polyurethane polymers,termed XiTRACK.This paper discusses how this technique can be used to solve these types of long-standing issues and presents actual polymer application profiles at two typical critical sites,namely a junction and a transition onto concrete slab-track. | Peter Keith WOODWARD Abdellah EL KACIMI Omar LAGHROUCHE Gabriela MEDERO Meysam BANIMAHD | 2012 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2012，13，11： | 20 |
| 20 | Multi-objective optimization design method of the high-speed train head显示文摘With the continuous improvement of the train speed, the dynamic environment of trains turns out to be aerodynamic domination. Solving the aerodynamic problems has become one of the key factors of the high-speed train head design. Given that the aerodynamic drag is a significant factor that restrains train speed and energy conservation, reducing the aerodynamic drag is thus an important consideration of the high-speed train head design. However, the reduction of the aerodynamic drag may increase other aerodynamic forces (moments), possibly deteriorating the operational safety of the train. The multi-objective optimization design method of the high-speed train head was proposed in this paper, and the aerodynamic drag and load reduction factor were set to be optimization objectives. The automatic multi-objective optimization design of the high-speed train head can be achieved by integrating a series of procedures into the multi-objective optimization algorithm, such as the establishment of 3D parametric model, the aerodynamic mesh generation, the calculation of the flow field around the train, and the vehicle system dynamics. The correlation between the optimization objectives and optimization variables was analyzed to obtain the most important optimization variables, and a further analysis of the nonlinear relationship between the key optimization variables and the optimization objectives was obtained. After optimization, the aerodynamic drag of optimized train was reduced by up to 4.15%, and the load reduction factor was reduced by up to 1.72%. | Meng-ge YU Ji-ye ZHANG Wei-hua ZHANG | 2013 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2013，14，9： | 19 |
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