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14th International Congress on Rock Mechanics and Rock engineering, ISRM 2019

作者： Cheng, Y. Song, Z.P. Jin, J.F. School of Civil Engineering Xi’an University of Architecture and Technology Xi’anShaanxi China Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering Xi’anShaanxi China School of Architectural and Surveying Engineering Jiangxi University of Science and Technology GanzhouJiangxi China

ISBN: (纸本)9780367422844

For the purpose of investigating the propagation and attenuation characteristics of stress wave, small disturbance impact tests under different unloading stresses were carried out by modified Split Hopkinson pressure bar test system. The effects of unloading stress on waveform, wave velocity, temporal-spatial attenuation characteristics, wave peak and its decreasing rate were studied. The results showed that whether the rock had unloading stress or not had significant effect on waveforms. The wave velocity experiences "dramatic decrease, then gentle development, and finally sharp decrease", the demarcation points of unloading stress are?/?c = 21.23% and?s/?c = 47.77%. Moreover, with the increase of distance and time, the wave peaks showed an exponential attenuation of different sensitivity degree. The wave peak and its decreasing rate are exponentially changed. The results can provide an important theoretical reference for the stability analysis of engineering rock mass during blasting excavation. © 2020 ISRM.

关键词： Rock mechanics

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Shallow Analysis on the Application Problems and Measures of Air Conditioning engineering Based on the Development of Green Energy Saving technology

Shallow Analysis on the Application Problems and Measures of...

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International Conference on Measuring technology and Mechatronics Automation, ICMTMA

作者： Wenfang Li Lei Xiong Civil Engineering And Architecture Jiangxi Science & Technology Normal University Nanchang Jiangxi China Civil Engineering Jiangxi College of Construction Nanchang Jiangxi China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170824

Under the development of green energy saving technology, the development of energy saving technology in the application of air conditioning engineering is becoming more and more common. The introduction of energy saving technology not only reduces the energy consumption and environmental pollution in construction, but also improves the construction precision and reduces the contradiction between supply and demand. This paper expounds some problems existing in the construction and design of air conditioning engineering and analyzes the important influence of corresponding solutions and energy-saving technologies for air conditioning engineering.

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A new receiver clock model to enhance BDS-3 real-time PPP time transfer with the PPP-B2b service

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Satellite Navigation 2023年第1期4卷 1-12,I0002页

作者： Yulong Ge Qing Wang Yong Wang Daqian Lyu Xinyun Cao Fei Shen Xiaolin Meng School of Marine Science and Engineering Nanjing Normal UniversityNanjing 210023China School of Instrument Science and Engineering Southeast UniversityNanjing 211189China Jiangsu Province Institute of Surveying and Mapping Engineering Nanjing 210013China College of Electronic Engineering National University of Defense TechnologyHefei 230037China School of Geography Nanjing Normal UniversityNanjing 210023China Faculty of Architecture Civiland Transportation EngineeringBeijing University of TechnologyBeijing 100124China State Key Laboratory of Geodesy and Earth’s Dynamics Innovation Academy for Precision Measurement Science and TechnologyCASWuhan 430077China GNSS Research Center Wuhan UniversityWuhan 430079China

A new Precise Point Positioning(PPP)service,called the PPP-B2b service,has been implemented in the BeiDou-3 Navigation Satellite System(BDS-3),which brings new opportunities for time ***,the solution using the traditional PPP method with the PPP-B2b correction still absorbs some unknown errors and needs reconverging when there exist abnormal *** developed a new receiver clock model to improve PPP time transfer using the PPP-B2b *** traditional PPP time transfers using PPP-B2b with BDS-3,Global Positioning System(GPS),and BDS-3/GPS(Scheme1)are compared with the corresponding time transfer with the proposed clock model(Scheme2).The results show that GPS-only PPP is not recommended because of low accuracy of 2 ***-3 or BDS-3/GPS PPP time transfers in Scheme1 can realize about 0.2 ns *** the new clock model is applied,the accuracy can be improved by up to 45%and 39.8%for BDS-3 and BDS-3/GPS PPP,*** proposed clock model can signifcantly improve the short-term frequency stability by 57.4%,but less for the long-term stability.

关键词： PPP-B2b BDS-3 Time transfer Receiver clock model

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Optimal procurement strategy of fresh produce retailer under stochastic product qualification and market demand

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Journal of Control and Decision 2021年第2期8卷 192-200页

作者： Zhouyang Liang Hongwei Liu Meihua Zuo Hui Zhu Yonghua Zuo School of Management Guangdong University of TechnologyGuangzhouPeople’s Republic of China School of Architecture and Civil Engineering Huizhou UniversityHuizhouPeople’s Republic of China School of Management Guangzhou UniversityGuangzhouPeople’s Republic of China School of Mathematics and Information Science Jiangxi Normal UniversityNanchangPeople’s Republic of China Jiangxi Institute of Economic Development NanchangPeople’s Republic of China

Consider an optimal procurement strategy for fresh produce,which is a type of perishable *** to the different quality provided by each manufacturer,the fresh produce qualification rates are ***,consumers demand is influenced by the freshness and price of products,as a result,the demand in the market is not *** this scenario,how a particular retailer should develop an optimal procurement strategy will be a core issue in supply chain *** order to address the above questions,the Bayesian approach is adopted to explore retailer optimal procurement strategies with uncertainty about product supply and market ***,simulation data are used to analyse the results of the proposed model and expected non-random model to illustrate the validity and feasibility of the proposed model.

关键词： Fresh produce optimal procurement strategy stochastic product qualification uncertainty of supply and demand Bayesian decision theory

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An neutron generator-based NIPGA system for on-site analysis

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Nuclear science and Techniques 2010年第1期21卷 63-64页

作者： JIA Fuquan1,2 GU Deshan1 CHENG Daowen1 LIU Linmao1,ZHU Qibo3 WANG Jishan3 (1 Radiation technology Institute,Northeast normal university,Changchun 130117,China 2 Department of Basic science,Jilin Institute of architecture and civil engineering,Changchun 130021,China 3 Dehui Xinyu Cement Co.,Ltd,Dehui 130300,China) Radiation Technology Institute Northeast Normal UniversityChangchun130117China Department of Basic Science Jilin Institute of Architecture and Civil EngineeringChangchun 130021China Radiation Technology Institute Northeast Normal UniversityChangchun130117China Radiation Technology Institute Northeast Normal UniversityChangchun130117ChinaRadiation Technology InstituteNortheast Normal UniversityChangchun130117China Dehui Xinyu Cement Co.Ltd Dehui 130300China

Utilizing NIPGA,an experimental device for cement raw material analysis has been developed,with a 2.5 MeV D-D neutron generator,BGO detector and 2048 MCA.A linear regression was developed for calculating the data.A 6-month on-site application of the system showed that the CaO,SiO2,Fe2O3 and Al2O3 analysis results agreed well with chemical analysis,within 0.40%,0.40%,0.50% and 0.50%,respectively.

关键词：中子发生器系统 BGO探测器 Al2O3 Fe2O3 原料分析实验装置回归计算

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Ecology community construction based on low-carbon idea

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1st International Conference on civil engineering, architecture and Building Materials, CEABM 2011

作者： Zhao, Chunrong Zhang, Ying College of Civil Engineering and Architecture Southwest University of Science and Technology Mianyang Sichuan621010 China College of Life Science Hainan Normal University Haikou571158 China

ISBN: (纸本)9783037851258

The low-carbon urban construction is an important carrier of the energy saving and emmission reduction,which will lead to an new trend of future city *** regarded as the important component of low-carbon construction, low-carbon ecology community will promote city sustainable development. And it is characteristic of the naturalness, economy and sociality. Based on present situation of chinese ecology community construction, some strategies are presented, incuding that the first is urban planning at macro-level;the second is spatial plan, transportation system, service facilities and green space system at medium measure;the third is water environment plan, energy plan, architectural design from at micro level;the fourth is community housing structure and public participation from social policies. © (2011) Trans Tech Publications.

关键词： Ecology

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Understanding diurnal variability in organic matter processing by microalgal-bacterial granular sludge in lake water remediation

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Bioresource technology 2025年 433卷 132717页

作者： Changqing Chen Yuting Shi Bingheng Chen Anjie Li Quan Meng Yu Jiang Bin Ji Department of Water and Wastewater Engineering School of Urban Construction Wuhan University of Science and Technology Wuhan 430065 China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources School of Resource and Environmental Engineering Wuhan University of Science and Technology Wuhan 430065 China Key Laboratory of Water and Sediment Sciences of Ministry of Education State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China School of Art and Design Wuhan University of Science and Technology Wuhan 430065 China School of Civil Engineering and Architecture Wuhan University of Technology Wuhan 430070 China

This study investigates the diurnal variability of organic matter removal by microalgal-bacterial granular sludge (MBGS) in lake water remediation. Results showed that daytime removal efficiencies for NH 4 + -N, NO 3 − -N, NO 2 − -N, TN, and TP reached 72.1%, 73.2%, 91.5%, 60.5%, and 52.8%, respectively, exceeding nighttime values of 52.7%, 55.8%, 88.4%, 37.9%, and 39.9%. However, chemical oxygen demand (COD) exhibited a net release during daytime, contrasting with removal during night conditions. Significant microbial community shifts, notably increased Bacteroidota abundance, were driven by fluctuations in dissolved oxygen and organic carbon levels. Additionally, the upregulation of fatty acid metabolism-related genes like paaF and ACSL provided mechanistic support COD removal efficiency. These findings suggest that optimizing MBGS operation through diurnal parameter regulation can enhance lake restoration efficacy and provide a theoretical foundation for developing sustainable engineering strategies in aquatic ecosystem management.

关键词： Diurnal variability Lake water remediation Microalgal-bacterial symbiosis Microbial community dynamics Organic matter processing

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Research on new automobile power hydraulic braking system by vibratory energy

Research on new automobile power hydraulic braking system by...

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2011 International Conference on Consumer Electronics, Communications and Networks, CECNet 2011

作者： Zhi-Hua, Ding Zheng-Bao, Lei Mu-Xi, Lei College of Automobile and Machinery Engineering Changsha University of Science and Technology Changsha Hunan China Mechanical and Material Engineering College JiuJiang University JiuJiang JiangXi China School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha Hunan China

ISBN: (纸本)9781612844572

A new automobile power hydraulic braking system by vibratory energy is introduced which includes four vibration dampers, four energy accumulators, hydraulic booster, one storage tank, four wheel cylinders, four electromagnetic one-way valves, brake master cylinder, vacuum booster, brake pedal and loading sensing pressure proportioning valve(LSPV). Vibration damper is composed of nitrogen cavity, piston, piston rod, shell, rebound valve, compression valve, inlet tube, outlet tube and so on. Energy accumulator contains relief valve and oil return tube. The electromagnetic one-way valves are controlled by brake pedal. Hydraulic booster is composed of piston, pushrod, inlet valve, oil return valve and so on. The oil is circulated between storage tank, energy accumulator, vibration dampers and hydraulic components. Oil from storage tank enters into vibration dampers by compression valve when the suspension is compressed and leaves by rebound valve when stretched. When the oil is flowing between compression valve and rebound valve, frictional heat is produced which depletes vibratory energy and damps the vibration. The pressurized oil flows into energy accumulator and then enters into hydraulic booster and wheel cylinders. Power generated by hydraulic booster and applied loads on brake pedal by driver is applied to piton of master cylinder and pressurize the oil. Pressurized oil from master cylinder and energy accumulator enters into wheel cylinders help them to fulfill their function. Vibratory energy is converted to output power of hydraulic component. The oil returns storage tank after braking is finished. The braking system can recycle some vibratory energy and convert to hydraulic energy which is used for automobile power braking system. It can reduce brake pedal force, lower fatigue of drive, shorten retardation time of braking, and enhance safety of braking. © 2011 IEEE.

关键词： Conceptual design

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Research on new vibratory energy-recycling hydraulic damping system

Research on new vibratory energy-recycling hydraulic damping...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Ding, Zhi-Hua Lei, Zheng-Bao Lei, Mu-Xi College of Automobile and Machinery Engineering Changsha University of Science and Technology Changsha Hunan China Mechanical and Material Engineering College JiuJiang University JiuJiang JiangXi China School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha Hunan China

ISBN: (纸本)9781424494392

A vibratory energy-recycling hydraulic damping system is introduced which includes four vibration dampers, one energy accumulator, one storage tank and some hydraulic components. Vibration damper is composed of nitrogen cavity, piston, piston rod, shell, rebound valve, compression valve, inlet tube, outlet tube and so on. Energy accumulator contains relief valve and oil return tube. The oil is circulated between storage tank, energy accumulator, vibration dampers and hydraulic components. Oil from storage tank enters into vibration dampers by compression valve when the suspension is compressed and leaves by rebound valve when stretched. When the oil is flowing between compression valve and rebound valve, frictional heat is produced which depletes vibratory energy and damps the vibration. The pressurized oil flows into energy accumulator and then enters into some hydraulic component by electromagnetic one-way valve when necessary, which together with pressurized oil from storage tank help hydraulic component to fulfill its function. Vibratory energy is converted to output power of hydraulic component. The oil returns storage tank after hydraulic component's function is finished. The introduced system can recycle some vibratory energy and reduce oil consumption. Pressurized oil from the system can be used for braking system, power-assisted steering, hydraulic clutch operating mechanism and so on. Structure of the system is simple and which is highly practical. © 2011 IEEE.

关键词： Conceptual design

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Research on new method of automobile developing process reengineering

Research on new method of automobile developing process reen...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Ding, Zhi-Hua Lei, Zheng-Bao Lei, Mu-Xi Mechanical and Material Engineering College JiuJiang University JiuJiang JiangXi China College of Automobile and Machinery Engineering Changsha University of Science and Technology Changsha Hunan China School of Civil Engineering and Architecture Changsha University of Science and Technology Changsha Hunan China

ISBN: (纸本)9781424494392

The development method of automobile is put forward which is based on Information Synthesis Approach (ISA), Concurrent engineering (CE) and Net Brainstorm (NBS), which aims at accelerating development of Automobile. There are four modules such as development preparation;automobile design, automobile manufacturing and automobile sell which make a magic ball according to rules of ISA. The four modules can subdivide into little magic balls. The balls of same hierarchy are carried through by Concurrent engineering. In order to find more and better development concepts, they feed back information reciprocally with principle of ISA. NBS is the main innovation mode in every job of automobile development. © 2011 IEEE.

关键词： Automobiles

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