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Numerical simulation analysis of wind field above pavement surface in different landforms by computational fluid dynamics approach

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第3期11卷 559-573页

作者： jian ouyang Zhao jiang Leiyu Ye Jing Li Peng Cao School of Civil Engineering and Architecture Hainan UniversityHaikou 570000China School of Transportation and Logistics Dalian University of TechnologyDalian 116024China Hexagon Manufacturing Intelligence(Qingdao)Co. Ltd.Qingdao 266000China China Tower Co. Ltd.Dalian BranchDalian 116024China Faculty of Architecture Civil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China

The temperature and moisture of the pavement structure can be greatly influenced by the wind speed above pavement *** wind speed above pavement surface not only is dominated by the wind speed of atmosphere,but also it is highly related to the landform and buildings around ***,currently there are no studies about the wind field above pavement surface in consideration of the effect of the landform and buildings.A simulation method,which is combined with geographic information system(GIS),wind data from meteorological observatory and computational fluid dynamics(CFD)software,is employed to study the effect of the landform and the wind speed of atmosphere on the wind field above pavement *** cases are studied,including an urban road,a coastal road and a mountainous ***,the wind field distribution above road surface in different wind directions was studied in our *** indicate that the wind field above pavement surface can be greatly affected by the landforms,buildings and wind *** simulation method can provide reliable results for the wind field above pavement *** maximum relative errors between simulated and measured wind speed can be less than 20%in the analysis of the three *** is recommended that the CFD simulation method is a good tool to accurately know the wind field above pavement surface.

关键词： Wind field above pavement surface Computational fluid dynamics Landforms Geographic information system Simulation

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H_(3)PO_(4) activated biochars derived from different agricultural biomasses for the removal of ciprofloxacin from aqueous solution

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Particuology 2023年第4期75卷 217-227页

作者： Jinbo ouyang jian Chen Wenqian Chen Limin Zhou Di Cai Cong Ren jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices East China University of TechnologyNanchang330013China Department of Pharmacy National University of Singapore117544Singapore National Energy Research and Development Center for Biorefinery Beijing University of Chemical TechnologyBeijing100029China

Biochars were prepared by the pyrolysis of various H_(3)PO_(4) activated agricultural biomasses at 600℃and subsequently used as adsorbents for the removal of ciprofloxacin(CIP)from aqueous *** shell-based biochar(PSBC),corncob-based biochar(CCBC)and cotton-based biochar(CTBC)had high surface areas(571.0-1006.3 m^(2)/g),well-developed pore structures(mesopores with large pore volumes)and available adsorption functional groups(C=C,C-N and C-O-C).The CIP adsorption onto the biochars was investigated by batch experiments(kinetics,isotherms,thermodynamics,pH,etc.).Thermodynamics calculations showed the spontaneous(ΔG^(θ)0)nature of the *** particular,CCBC exhibited high adsorption capacity(120.6 mg/g)of CIP in real lake water and it also had significant removal efficiency of other common pharmaceutical contaminants from real lake environ-ment,and even in a coexisting quintuple ***,multiple interaction mechanisms of CIP adsorption onto aromatized biochar were explored combining characterization analysis and theoretical *** of the mechanism of CIP adsorption onto biochar provides new insights into the assessment of the removal of pharmaceuticals from the aqueous environment.

关键词： Biochar Adsorption Pharmaceutical contaminants Ciprofloxacin Water remediation

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Optimal distributed resource allocation in a wireless sensor network for control systems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第1期8卷 106-112页

作者： MAO jian-lin WU Zhi-ming Department of Automation Shanghai Jiao Tong University Shanghai 200240 China School of Information Engineering and Automation Kunming University of Science and Technology Kunming 650093 China

Wireless technology is applied increasingly in networked control systems. A new form of wireless network called wireless sensor network can bring control systems some advantages, such as flexibility and feasibility of network deployment at low costs, while it also raises some new challenges. First, the communication resources shared by all the control loops are limited. Second, the wireless and multi-hop character of sensor network makes the resources scheduling more difficult. Thus, how to effectively allocate the limited communication resources for those control loops is an important problem. In this paper, this problem is formulated as an optimal sampling frequency assignment problem, where the objective function is to maximize the utility of control systems, subject to channel capacity constraints. Then an iterative distributed algorithm based on local buffer information is proposed. Finally, the simulation results show that the proposed algorithm can effectively allocate the limited communication resource in a distributed way. It can achieve the optimal quality of the control system and adapt to the network load changes.

关键词： Wireless sensor networks (WSN) Distributed resource allocation Control systems Optimization.

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Blind estimation of phase offset in OFDM subcarrier for coherent demodulation

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Journal of Systems Engineering and Electronics 2012年第4期23卷 473-480页

作者： jian Chen Long Yang ming Li School of Telecommunications Engineering Xidian UniversityXi'an 710071E R.China

An adaptive algorithm named low complexity phase off- set estimation （LC-POE） is proposed for orthogonal frequency division multiplexing （OFDM） signals. Depending on the requirement, the estimation procedure is divided into several scales to accelerate the adaptive convergence speed and ensure the estimation accuracy. The true phase offset is estimated through shrinking the detection range and raising the resolution scale step by step. Both the convergence performance and complexity are discussed in the paper. Simulation results show the effectiveness of the proposed algorithm. The LC-POE algorithm is promising in the application of OFDM systems.

关键词： phase offset estimation (POE) coherent receiver adaptive phase recovery orthogonal frequency division multiplexing (OFDM).

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Hydrothermal Synthesis and Structure Analysis of Indium Vanadate (InVO_4)

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Chinese Journal of Structural Chemistry 2005年第11期24卷 1242-1248页

作者： HUANG Qing-ming YU jian-Chang Instrumentation Analysis and Research Center Fuzhou University Fuzhou Fujian 350002 China Material science and engineering department Fuzhou University Fuzhou Fujian 350002 China

In this article, hydrothermal process is applied to synthesize nanometer InVO4. Influences of different experimental conditions （including mixing ratio of raw materials, reaction temperature, reaction time and so on） upon the synthetic products＇ purity and crystallite size are discussed to determine the best synthetic condition. The structure of nanometer InVO4 is analyzed, which helps to further understand the structure characteristics of InVO4 synthesized by applying hydrothermal process and lays foundation for further research.

关键词： hydrothermal process InVO4 experimental conditions structure

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S空位及非金属掺杂单层Bi_(2)S_(2)Se的第一性原理研究

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原子与分子物理学报 2025年第1期42卷 127-134页

作者：张建华王敏陈畅曹倩徐银湖北大学资源环境学院武汉430062

Bi_(2)S_(2)Se是一种新兴的具有优异光电性能的材料,因此受到了广泛的关注.本研究采用第一性原理方法和开源程序,研究了本征单层Bi_(2)S_(2)Se以及掺杂非金属元素X(X=P,Cl,Br和I)和S空位的体系的电子结构和光学特性.计算结果表明,改性... 详细信息

Bi_(2)S_(2)Se是一种新兴的具有优异光电性能的材料,因此受到了广泛的关注.本研究采用第一性原理方法和开源程序,研究了本征单层Bi_(2)S_(2)Se以及掺杂非金属元素X(X=P,Cl,Br和I)和S空位的体系的电子结构和光学特性.计算结果表明,改性后出现了晶格缺陷.含S空位和P、Cl、Br掺杂体系的带隙减少,而I掺杂体系的带隙增加.同时,含S空位和Cl、Br、I掺杂体系的费米能级穿过导带底,而P掺杂体系的费米能级穿过价带顶.所有改性体系在费米能级附近都出现了缺陷能级或杂质能级,表现出较高的可见光吸收能力和散射能力,改性体系的对可见光的吸收能力和散射能力有所增加.

关键词： Bi_(2)S_(2)Se 掺杂电子结构光学性质第一性原理

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Pressure-driven layer-dependent phase transitions and enhanced interlayer coupling in PdSe_(2) crystals

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Nano Research 2024年第11期17卷 10170-10178页

作者： Junnan Ding Xing Xie Xinyu ouyang Junying Chen Fangping ouyang Zongwen Liu jian-Tao Wang Jun He Yanping Liu Institute of Quantum Physics School of Physics Central South University Changsha 410083 China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University Changsha 410083 China School of Physics and Technology State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources Xinjiang University Urumqi 830046 China School of Chemical and Biomolecular Engineering The University of Sydney Sydney NSW 2006 Australia The University of Sydney Nano Institute The University of Sydney Sydney NSW 2006 Australia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan 523808 China

Pressure exerts a profound influence on atomic configurations and interlayer interactions, thereby modulating the electronic and structural properties of materials. While high pressure has been observed to induce a structural phase transition in bulk PdSe_(2) crystals, leading to a transition from semiconductor to metal, the high-pressure behavior of few-layer PdSe_(2) remains elusive. Here, employing diamond anvil cell (DAC) techniques and high-pressure Raman spectroscopy, we investigate the structural evolution of layer-dependent PdSe_(2) under high pressure. We reveal that pressure significantly enhances interlayer coupling in PdSe_(2), driving structural phase transitions from an orthorhombic to a cubic phase. We demonstrate that PdSe_(2) crystals exhibit distinct layer-dependent pressure thresholds during the phase transition, with the decrease of transition pressure as the thickness of PdSe_(2) increases. Furthermore, our results of polarized Raman spectra confirm a reduction in material anisotropy with increasing pressure. This study offers crucial insights into the structural evolution of layer-dependent van der Waals materials under pressure, advancing our understanding of their pressure-induced behaviors.

关键词： palladium diselenide high pressure phase transition diamond anvil cell anisotropy

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Spinal dural arteriovenous fistula 8 years after lumbar discectomy surgery: A case report and review of literature

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World Journal of Clinical Cases 2021年第20期9卷 5594-5604页

作者： Yang ouyang Yang Qu Rong-Peng Dong ming-Yang Kang Tong Yu Xue-Liang Cheng jian-Wu Zhao Department of Orthopaedics The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina

BACKGROUND Spinal dural arteriovenous fistula(SDAVF)is an extremely rare vascular malformation of the central nervous system that is often confused with degenerative spinal disorders due to similar early symptoms and clinical ***,we report a case of SDAVF recurrence 8 years after lumbar spine surgery and summarize relevant *** SUMMARY A 54-year-old male was admitted to our hospital complaining of lower back pain,numbness in both lower extremities and intermittent *** imaging identified lumbar spinal *** surgical treatment,the patient’s symptoms significantly resolved,and he was able to perform daily ***,similar symptoms appeared 8 years later,followed by confirmation of SDAVF *** patient underwent neurosurgery 7 mo after symptom *** follow-up period lasted 14 mo,and the patient remains with marginal neurological *** This case highlights the importance of prompt SDAVF *** to its nonspecific clinical presentation,the clinical experience of the surgeon and definitive imaging examination are ***,timely neurosurgery is effective and may significantly improve patient outcomes.

关键词： Central nervous system vascular malformations Spinal degenerative disease Spinal stenosis Neurosurgery Diagnosis Differential Case report

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Coordination control method to block cascading failure of a renewable generation power system under line dynamic security

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Protection and Control of Modern Power Systems 2023年第1期8卷 194-204页

作者： Jinxin ouyang jianfeng Yu Xiaoxuan Long Yanbo Diao jian Wang State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingChina Information and Communication Branch of State Grid Chongqing Electric Power CompanyChongqingChina Chongqing City Management College ChongqingChina

The large application of renewable energy generation(REG)has increased the risk of cascading failures in the power *** the same time REG also provides the possibility of new approaches for the suppression of such ***,the capacity and position of the synchronous generator(SG)involved in regulation limit the power regu-lation speed(PRS)of REG to the overload line which is the main cause of cascading failures,while the PRS of SG is related to the position and shedding *** and SGs have difficulty in achieving effective cooperation under constraints of system power ***,the dynamic variation of line flow during power regulation causes new problems for the accurate evaluation of line thermal safety under ***,a new strategy for quan-titatively coordinating shedding power and power regulation to block cascading failures in the dynamic security domain is proposed in this *** control capability and dynamic security domain of the overload line are mod-eled,and the coordination control method based on power regulation is then proposed to minimize shedding *** algorithm for the optimal control scheme considers the constraints of load capacity,power source capacity and bus *** correctness of the proposed method is verified using case studies.

关键词： Cascading failures Overload Shedding power Power regulation Thermal stability

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Topological evolution of cerium(Ⅲ) molybdate microflake assemblies induced by amino acids

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Chinese Chemical Letters 2016年第5期27卷 673-677页

作者： ming-Kun Xu Zhen-Hua ouyang Zhu-Rui Shen Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education School of Materials Science and Engineering Tianjin University Institute of New Catalytic Materials Science Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education College of Chemistry Nankai University jiangsu Province Key Laboratory of Fine Petrochemical Engineering Changzhou University

In this work, cerium（Ⅲ） molybdate microspheres configured as microflakes were synthesized in the presence of lysine via a hydrothermal process. We studied the role of lysine and other amino acids on the morphologic control of cerium（IIl） molybdate crystals. First, with the increase of lysine, thinner microflakes and smaller microspheres are obtained. Moreover, a transformation in topology of cerium（Ⅲ） molybdate assemblies from three-dimensional （3D） into two-dimensional （2D） can be ascribed to controlled nucleation and growth of cerium（Ⅲ） molybdate induced by lysine. Second, amino acids with strong hydrophilic ＂R＂ groups tend to induce nucleation and result in spherical assemblies formed by nanoparticles or nanoflakes, while those with weaker hydrophilic ＂R＂ groups tend to induce growth and yield spherical assemblies of microflakes.

关键词： Hydrothermal Amino acidsSelf-assembly Cerium molybdate Morphology control

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