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Flow Structure and Short-Term Riverbed Evolution in Curved Flumes

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Fluid Dynamics & Materials Processing 2023年第2期19卷 487-500页

作者： Shuxian Gao yonggang cao Yuchuan Bai Yanhua Yang Tianjin Research Institute for Water Transport Engineering Ministry of TransportTianjinChina South China Sea Marine Survey and Technology Center State Oceanic AdministrationGuangzhouChina State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjinChina

River bending is the major effect responsible for bed topography and bank *** this study,fluid velocity(measured by a three-dimensional Doppler advanced point current meter)and bed topographical data have been collected in 40 sections of an experimental *** whole flume was composed of an organic glass bend,upstream and downstream water tanks,two transition straight sections,a circulation pump,and a connection *** section has been found to be characterized by a primary circulation and a small reverse circulation,with some sections even presenting three more or more circulation *** minimum circulation intensity has been detected in proximity to the top of the curved channel,while a region with small longitudinal velocity has been observed near the concave bank of each bend,corresponding to the flat bed formed after a short period of *** maximum sediment deposition and scour depth in the presence of a uniform distribution of living flexible vegetation within 10 cm of the flume wall have been found to be smaller than those observed in the tests conducted without vegetation.

关键词： Continuous curved flume experimental study flow structure bed short-term evolution living flexible vegetation

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基于自组网的气象监测系统设计及应用

气象水文海洋仪器 2024年第2期41卷 118-121页

作者：张新文曹永港林冠英许铭彬自然资源部海洋环境探测技术与应用重点实验室广州510310 自然资源部南海调查中心广州510310

为提高气象监测系统的快速组网和传感器即插即用能力,文章结合无线通信技术设计了一种基于自组网的气象监测系统。该系统搭载了数据采集控制与融合软件,能够通过配置方式兼容不同传感器的输出格式和数据解析协议,可使气象传感器以软件... 详细信息

为提高气象监测系统的快速组网和传感器即插即用能力,文章结合无线通信技术设计了一种基于自组网的气象监测系统。该系统搭载了数据采集控制与融合软件,能够通过配置方式兼容不同传感器的输出格式和数据解析协议,可使气象传感器以软件配置的方式接入监测系统。基于广东某码头工程建设项目的应用结果表明:该系统运行稳定,数据获取率高,新增和扩展监测节点时减少了软硬件设计变更,具有组网部署快速和扩展性好的优点,可推广应用到其他无人值守环境监测平台。

关键词：气象监测系统自组网数据采集控制

Electromechanical Transient Modeling Analysis of Large-Scale New Energy Grid Connection

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Energy Engineering 2024年第4期121卷 1109-1125页

作者： Shichao cao yonggang Dong Xiaoying Liu Department of Electrical Engineering Hebei Vocational University of Technology and EngineeringXingtai054000China

The synchronous virtual machine uses inverter power to imitate the performance of the conventional synchronous *** also has the same inertia,damping,frequency,voltage regulation,and other external performance as the *** is the key technology to realize new energy grid connections’stable and reliable *** project studies a dynamic simulation model of an extensive new energy power system based on the virtual synchronous motor.A new energy storage method is *** mathematical energy storage model is established by combining the fixed rotor model of a synchronous virtual machine with the charge-discharge power,state of charge,operation efficiency,dead zone,and inverter *** rapid conversion of energy storage devices absorbs the excess instantaneous kinetic energy caused by *** branch transient of the critical cut set in the system can be confined to a limited ***,the virtual synchronizer’s kinetic and potential energy can be efficiently converted into an instantaneous *** simulation of power system analysis software package(PSASP)verifies the correctness of the theory and algorithm in this *** paper provides a theoretical basis for improving the transient stability of new energy-connected power grids.

关键词： New energy grid connection transient electromechanical modeling synchronous virtual machine PSASP software energy storage

Deep decalcification of factory-provided freezing acidolysis solution to achieveα-high-strength gypsum

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Chinese Journal of Chemical Engineering 2024年第5期69卷 143-151页

作者： Wencai Ye Yulu Li yonggang Dong Lin Yang Yun Yi Jianxin cao School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China Engineering Research Center of Efficient Utilization for Industrial Waste Guizhou UniversityGuiyang 550025China Key Laboratory of Guizhou Province for Green Chemical Industry and Clean Energy Technology Guizhou UniversityGuiyang 550025China

The freezing acidolysis solution of the nitric acid-phosphate fertilizer process has a high calcium content,which makes it difficult to produce fine phosphate and high water-soluble phosphate fertilizer ***,based on the potential crystallization principle of calcium sulfate in NH_(4)NO_(3)-H_(3)PO_(4)-H_(2)O,the deep decalcification(*** removal)technology to achieveα-high-strength gypsum originated from freezing acidolysis-solutions has been firstly proposed and ***,calcium can be removed from the factory-provided freezing acidolysis-solution by neutralizing it with ammonia,followed by the addition of ammonium sulfate *** a result,the formation of calcium sulfate in the reaction system undergoes the nucleation and growth of CaSO_(4)·2H_(2)O(DH),as well as its dissolution and crystallization into short columnarα-CaSO_(4)·0.5H_(2)O(α-HH).Remarkably,with the molar ratio of SO_(4)^(2-)/Ca^(2+)at 1.8,the degree of neutralization(NH_(3)/HNO_(3) molar ratio)at 1.7,the reaction temperature of 94℃,and the reaction time of 300 min,the decalcification rate can reach 86.89%,of which the high-strengthα-CaSO_(4)·0.5H_(2)O(α-HH)will be ***,the deep decalcification product meets the standards for the production of fine phosphates and highly water-soluble phosphate ***,the 2 h flexural strength ofα-HH is 5.3 MPa and the dry compressive strength is 36.8 MPa,which is up to the standard of commercialα-HH.

关键词： Nitrophosphate Ammonia neutralization Deep decalcification High-strengthα-hemihydrate gypsum Controlled crystallization at atmospheric pressure

Design Innovation and Practice of“One Stationwith One Landscape”for High Speed Railway Stations

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Chinese Railways 2022年第1期 24-31页

作者： SUN Xing cao yonggang ZHANG Ting Architectural Engineering Design and Research Institute China Railway Engineering Consulting Group Co.Ltd. China Railway Engineering Consulting Group Co.Ltd.

Since the founding of New China,railway station design has experienced a long development and evolution process,and has now developed to the fourth generation,which is called the New Era Railway *** by the new concept of building up a“well-connected fully-integrated,envionmeni-friendly passenger-oriented,economic-efficient,culturally-rich,intelligent and convenient”station,the station building becomes more personalized and specialized displaying distinctive effects,and the design connotation of“one station with one landscape”has also been widened and deepened From the simple differentiated design of facade image,the design is gradually becoming station-specific and customized with station-city integrated development and passengers'boarding and alighting feelings as the *** purpose is to make the station truly become a prominent card and landmark building that facilitates city development.

关键词： high speed railway high speed railway stations one station with one landscape overall design

Prediction of Scour Depth around Offshore Pipelines in the South China Sea

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Journal of Marine Science and Application 2015年第1期14卷 83-92页

作者： yonggang cao Yuchuan Bai Junqin Wang Shizhi Liao Dong Xu State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin 300072 China South China Sea Marine Engineering Surveying Center State Oceanic Administration Guangzhou 510300 China China National Offshore Oil Corporation General Research Institute Beijing 100027 China

搜索深度预言近海管道具有到海底的管道工程的设计和构造的大意义。在这份报纸，基于 CFD 软件，流畅的包裹和用户定义功能(UDF ) ，一个 Eulerian 二阶段的模型，包括为水和沉积的联合模型分阶段执行的 Euler-Euler，和为液体的一个狂... 详细信息

搜索深度预言近海管道具有到海底的管道工程的设计和构造的大意义。在这份报纸，基于 CFD 软件，流畅的包裹和用户定义功能(UDF ) ，一个 Eulerian 二阶段的模型，包括为水和沉积的联合模型分阶段执行的 Euler-Euler，和为液体的一个狂暴的模型分阶段执行，被采用在管道附近预言 scour 深度。模型被从实验室实验获得的观察数据验证。根据模拟，包括早期的速度的效果，影响 scour 深度的因素等等输送直径和沉积粒子尺寸，被调查。根据各种各样的沉积的早期的速度的公式，同时接近计算在上理论搜索深度在华南海为七个车站的管道被开发，在设计申请的地方，信息是可得到的。

关键词：海底管道冲刷深度深度预测中国南海沉积物粒度用户定义函数 FLUENT 计算流体力学

Numerical Study on the Effect of the Manila Seismic Tsunami on the Guangdong Coast——The Nonlinear Effects of Tides and Tsunamis

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Earthquake Research in China 2019年第1期33卷 97-111页

作者： cao yonggang LIU Changjian LIU Tongmu FENG Yanqing LIU Yuqiang LIAO Shizhi CHEN Yizhan South China Sea Marine Survey and Technology Center SOA State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Key Laboratory of Technology for Safeguarding of Maritime Rights and Interests and Application SOA Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province

The coupling numerical model between astronomical tide and tsunamis was built based on the data of the COMCOT model, which was verified by the Japan "3·11" tsunami. The tsunami source of the Manila seismic tsunami was designed and computed to analyze the risk of tsunami which will happen in the Guangdong coast. According to the results, the maximum quantity of water increasing and the time of the tsunami arriving at the Guangdong seacoast were calculated. The coupling simulation between astronomical tide and tsunamis has significant meaning for evaluating the risk and early-warning of tsunamis in the Guangdong coastal area.

关键词： COMCOT model Earthquake tsunami Manila seismic zone Numerical simulation Guangdong coast

Preparation and evaluation of nano-hydroxyapatite/poly(styrene-divinylbenzene) porous microsphere for aspirin carrier

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Science China Chemistry 2012年第6期55卷 1134-1139页

作者： LI Sen WANG Kuan CHANG Kue-Chieh Alan ZONG Ming WANG Jing cao yonggang BAI YuHua WEI TaiMing ZHANG ZhiRen School of Pharmacy Daqing Campus Harbin Medical University Daqing 163319 China School of Life Science and Biotechnology Dalian University of Technology Dalian 116024 China Departments of Pharmacy and Cardiology The 2nd Affiliated Hospital of Harbin Medical University Key Laboratories of Ministry of Education for Myocardial lschemia Mechanism and Treatment Harbin Medical University Harbin 150086 China

A novel vehicle for the delivery of aspirin (ASA) was prepared from porous nano-hydroxyapatite/poly(styrene-divinylbenzene) [nano-HAP/P(St-DVB)] composite microspheres by grafting nano-HAP [Ca10(PO4)6(OH)2] onto porous P(St-DVB) microspheres. Four types of porous composite microspheres were prepared, each with different nano-HAP contents. The ASA-loaded composite microspheres prepared with 10% and 15% nano-HAP (mass ratio) exhibited excellent buoyancy with relatively short instantaneous floating time (within 10 min) and a long sustained floating time (12 h) in simulated gastric juice. They also offered good sustained release of ASA (up to 8 h). Furthermore, these composite microspheres displayed good buffering capacity that prevented the buildup of acidity caused by hydrolysis of ASA, keeping the pH of gastric juice within the normal range (pH 0.9 to 1.5). The results showed that porous nano-HAP/P(St-DVB) composite microspheres prepared with 10% and 15% nano-HAP could be used as a novel drug carrier for ASA, providing a sustained release dose without leading to stomach irritation, a side effect that is often associated with ASA medication.

关键词：纳米羟基磷灰石多孔微球阿司匹林药物载体二乙烯苯苯乙烯制备 ST-DVB

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地下环路交织区合理长度计算方法

地下空间与工程学报 2024年第4期20卷 1086-1096,1123页

作者：曹煜王永岗长安大学运输工程学院西安710018

为优化地下环路设计,本文从通行能力着手,结合交通仿真分析,对地下环路交织区长度进行研究。首先,基于多个影响因素构建了计算方法,并对各参数进行了标定;接着,通过Vissim仿真软件和间接安全评价模型(SSAM)对所建方法进行了检验;最后给... 详细信息

为优化地下环路设计,本文从通行能力着手,结合交通仿真分析,对地下环路交织区长度进行研究。首先,基于多个影响因素构建了计算方法,并对各参数进行了标定;接着,通过Vissim仿真软件和间接安全评价模型(SSAM)对所建方法进行了检验;最后给出了一般情况下地下环路交织区长度的建议值。结果表明:仿真与计算方法所得结果误差小于4.2%,证明了所建方法的有效性;对比原项目和所建方法所得设计,后者交通冲突率降低73.2%,证明所建方法得到的交织区长度更为合理;建设地下环路后,车辆行程时间最高缩短了39.6%,延误情况缩短至2 s内,排队长度最大缩短了88.1 m,表明运用所建方法建设地下环路具有较高可行性。依据所建方法进行交织区长度设计能够提高地下环路交通安全水平,缓解城市核心区的拥堵情况。

关键词：交通工程地下环路交织区通行能力交织区长度交通仿真