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Uncertainties of landslide susceptibility prediction: Influences of random errors in landslide conditioning factors and errors reduction by low pass filter method

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 213-230页

作者： Faming Huang Zuokui Teng Chi Yao Shui-Hua Jiang Filippo Catani Wei Chen Jinsong Huang School of Infrastructure Engineering Nanchang UniversityNanchang330031China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China Department of Geosciences University of PadovaPadovaItaly College of Geology and Environment Xi’an University of Science and TechnologyXi’an710054China Discipline of Civil Surveying and Conditioning EngineeringPriority Research Centre for Geotechnical Science and EngineeringUniversity of NewcastleNewcastleNSWAustralia

In the existing landslide susceptibility prediction(LSP)models,the influences of random errors in landslide conditioning factors on LSP are not considered,instead the original conditioning factors are directly taken as the model inputs,which brings uncertainties to LSP *** study aims to reveal the influence rules of the different proportional random errors in conditioning factors on the LSP un-certainties,and further explore a method which can effectively reduce the random errors in conditioning *** original conditioning factors are firstly used to construct original factors-based LSP models,and then different random errors of 5%,10%,15% and 20%are added to these original factors for con-structing relevant errors-based LSP ***,low-pass filter-based LSP models are constructed by eliminating the random errors using low-pass filter ***,the Ruijin County of China with 370 landslides and 16 conditioning factors are used as study *** typical machine learning models,*** perceptron(MLP),support vector machine(SVM)and random forest(RF),are selected as LSP ***,the LSP uncertainties are discussed and results show that:(1)The low-pass filter can effectively reduce the random errors in conditioning factors to decrease the LSP uncertainties.(2)With the proportions of random errors increasing from 5%to 20%,the LSP uncertainty increases continuously.(3)The original factors-based models are feasible for LSP in the absence of more accurate conditioning factors.(4)The influence degrees of two uncertainty issues,machine learning models and different proportions of random errors,on the LSP modeling are large and basically the same.(5)The Shapley values effectively explain the internal mechanism of machine learning model predicting landslide *** conclusion,greater proportion of random errors in conditioning factors results in higher LSP uncertainty,and low-pass filter can effectively reduce these random e

关键词： Landslide susceptibility prediction conditioning factor errors Low-pass filter method Machine learning models Interpretability analysis

The　Feasibility　Study　of　the　Waste　Heat　air－conditioning　System　for　Automobile

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Journal of Thermal Science 1994年第2期3卷 126-129页

作者： Gui-ping Lin Xiu-gan Yuan Zhi-guang Mei(air-conditioning and Refrigeration Institute, Beijing University of Aeronautics and Astronautics, Beijing 100083) air-conditioning and Refrigeration Institute Beijing University of Aeronautics and Astronautics Beijing

In this paper, the feasibility of application of a solid-absorption system using ammonia and chlorides as working pair to automobile air-conditioning system is investigated. This system has the advantages of minimum environmental problem and utilizing waste heat from the automobile engine as thermal energy input. Analyses show that the main problem associated with the application of solid-absorption system is the size of the reactors. Techniques to solve this problem are discussed.

关键词： air-conditioning waste heat automobile.

Energy performance assessment on central air-conditioning system of commercial building: A case study in China

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Journal of Central South University 2015年第8期22卷 3168-3179页

作者：周璇练斯甄闫军威康英姿 School of Mechanical & Automotive Engineering South China University of Technology City air-conditioning Energy Conservation and Control Project Technology Research Exploitation Center of Guangdong

Energy performance assessment on central air-conditioning system is essential to optimize operating, reduce operating costs, improve indoor environmental quality, and determine whether the retrofitting of the equipment is necessary. But it is difficult to evaluate it reasonably and comprehensively due to its complexity. A "holistic" approach was discussed to evaluate the energy performance of central air-conditioning system for an extra-large commercial building in a subtropical city. All procedures were described in detail, including field investigation method, field measurement instruments, data processing and data analyzing. The main factors affecting energy consumption of air-conditioning system were analyzed and the annual cooling-energy use intensity of this building was calculated and also compared with other shopping malls and other types of buildings in Guangzhou. And COP(coefficient of performance) of chiller, water transfer factor of chilled water system and cooling water system were taken into consideration. At last, the thermal comfort and indoor air quality issues were addressed. The results show that the chilled water pumps are over-sized and the indoor environmental quality should be improved. The purpose of this work is to provide reference for energy performance assessment method for air-conditioning system.

关键词： energy performance assessment thermal comfort indoor air quality central air-conditioning system energy saving

Fuzzy logic controller design with unevenly-distributed membership function for high performance chamber cooling system

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Journal of Central South University 2014年第7期21卷 2684-2692页

作者：曹健鹏 Seok-Kwon Jeong Young-Mi Jung Graduate School of Refrigeration and air-conditioning Engineering Pukyong National University Department of Refrigeration and air-conditioning Engineering Pukyong National University

Fuzzy logic controller adopting unevenly-distributed membership function was presented with the purpose of enhancing performance of the temperature control precision and robustness for the chamber cooling *** equalization and noise detection were performed to modify the evenly-distributed membership functions of error and error change rate into unevenly-distributed membership ***,the experimental results with evenly and unevenly distributed membership functions were compared under the same outside environment *** experimental results show that the steady-state error is reduced around 40% and the noise disturbance is rejected successfully even though noise range is 60% of the control precision *** control precision is improved by reducing the steady-state error and the robustness is enhanced by rejecting noise disturbance through the fuzzy logic controller with unevenly-distributed membership ***,the system energy efficiency and lifetime of electronic expansion valve(EEV) installed in chamber cooling system are improved by adopting the unevenly-distributed membership function.

关键词： chamber cooling system fuzzy logic controller unevenly-distributed membership function steady-state error reduction robustness variable speed refrigeration system

Recent Advances of Sensitive Electrochemical Sensing Platforms for Rapid Detection of Phthalate Acid Esters

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Instrumentation 2024年第2期11卷 9-23页

作者： Xiuxiu Dong Lili Zhang Meicai Ge Minfu Wu Qijian Niu Key Laboratory of Modern Agricultural Equipment and Technology(Jiangsu University) Ministry of EducationSchool of Agricultural EngineeringJiangsu UniversityZhenjiangJiangsu 212013China Nantong Huaxin Central air-conditioning CO. LTDNantongJiangsu 226014China Department of Food Science Foshan PolytechnicFoshanGuangdong 528137China

As a kind of plasticizer,phthalic acid esters(PAEs)are often added to plastics to enhance elasticity,transparency,durability and prolong service ***,it does not chemically bind to plastics and is easy to migrate to the *** is difficult to degrade in the environment,and it is also enriched in the human body through the food chain and respiration,which will lead to obvious adverse reactions such as decreased learning and memory function and neurobehavioral *** to the toxicity,universality and low concentration limitations of PAEs in the environment and food,it is essential to achieve rapid and sensitive detection of PAEs in soil,atmosphere,water and ***(EC)sensors have the advantages of simplicity,fast,low cost,portability,easy operation,high specificity and high sensitivity,so they are applied for the detection of *** there are a large number of studies on the detection of PAEs by EC sensors,there is no review on this *** this review,we introduce the detection of PAEs from classical EC sensors,electrochemiluminescence(ECL)sensors and photo-electrochemical(PEC)sensors in the past five *** review is beneficial to understanding the construction of EC sensors and the detection mechanism of *** also propose that the development of rapid,accurate and real-time detection methods of PAEs is key to assessing risk and preventing related diseases.

关键词： phthalate acid esters electrochemical sensor determination

Energy and Exergy Analysis of a Cooling/Power Cogeneration Ejector Refrigeration System

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Journal of Thermal Science 2022年第2期31卷 448-462页

作者： YANG Mengke LI Xiuzhen WANG Lin YUAN Junfei WANG Zhanwei LIANG Kunfeng Institute of Refrigeration and air conditioning Henan University of Science and TechnologyLuoyang 471023China

The organic Rankine cycle is introduced into the conventional ejector refrigeration(CER)system to establish the low-grade heat-driven cooling/power cogeneration ejector refrigeration(CPC-ER)system using the isobutane as the *** comparison with the CER system where external power is consumed by the circulating pump,the power output from the CPC-ER system is more than the power consumption of its circulating pump so that a portion of net power is derived from the CPC-ER *** on the mathematical model of thermodynamics,energy and exergy analysis of the CPC-ER system is carried out and compared with the CER *** results reveal that the equivalent coefficient of performance(COP)of the CPC-ER system is 41.14%to 71.30%higher than that of the CER system,and the exergy efficiency of the CPC-ER system is 1.32 to 1.49 times higher than that of the CER *** the power produced by the turbine and the total exergy output from the CPC-ER system approach the maximum,as the generating temperature in the generator is up to 80°*** CPC-ER system has the higher energy utilization efficiency than the CER system,and it is suitable for the cooling and power-required places with low-grade thermal sources.

关键词： ejector refrigeration exergy power consumption equivalent COP

Experimental Investigation of Heat Transfer in Microchannel with Inlet Cavitation Structure

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Journal of Thermal Science 2021年第1期30卷 294-301页

作者： YUAN Junfei WANG Lin WANG Zhanwei TAN Yingying Institute of Refrigeration and air conditioning Henan University of Science and TechnologyLuoyang 471023China

Heat transfer of R134 a through the microchannel with an inlet reentrant cavitation structure was investigated for high flux thermal management of electronic *** cavitating flow patterns,pressure,and heat transfer characteristics were studied in the range of effective heat fluxes from 0 to 138.4 W/cm2 with mass flow velocities from 2.12 to 5.23 m/s.A stable and ideal starting point of two phase flow and heat transfer was commendably provided by the inlet cavitation *** existed an axis deviation liquid jet after the *** refrigeration vapor was generated from the cavitation structure but liquidized at the downstream of the *** wall temperature along flow orientation presented an opposite trend under the test states with or without heat *** cavitation structure can significantly suppress the flow oscillation in microchannels and the outlet pressure fluctuation reduced about 72%compared with the fluctuation at the *** heat transfer coefficient had been distinctly impacted by heat flux at lower heat input and then maintained the value nearly constant of 11.0 W/(cm^(2)·K)with the critical heat flux of 88.4 W/cm2.

关键词： heat transfer cavitation structure flow pattern pressure oscillation microchannel

Thermodynamic Evaluation of Transcritical CO_(2) Heat Pump Considering Temperature Matching under the Constraint of Heat Transfer Pinch Point

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Journal of Thermal Science 2021年第3期30卷 869-879页

作者： LIU Ruijian GAO Fengling LIANG Kunfeng WANG Lin WANG Moran MI Guoqiang LI Yachao Institute of Refrigeration and air-conditioning Henan University of Science and TechnologyLuoyang 471003China

The non-linear temperature glide in the supercritical CO_(2) cooling process makes the heat transfer pinch point of heat exchanger show multiplicity,like size,location distribution and quantity,which makes the thermodynamic performance of the CO_(2) transcritical cycle more complex and eventually affects the evaluation of the optimal operating state of the *** on the second law of thermodynamics and the constraints of heat transfer pinch,a thermodynamic evaluation method of CO_(2) transcritical heat pump system was proposed according to the degree of temperature *** influence mechanism of multi-characteristic change of heat transfer pinch point on temperature matching degree and the effect of temperature matching degree on thermodynamic performance of CO_(2) transcritical heat pump system were *** relationship between temperature matching degree,COP and exergy efficiency of the system was *** is considered that the change of temperature matching index value can clearly characterize the change trends of COP and exergy *** is,the smaller the temperature matching degree is,the closer the temperature distribution of heat transfer fluids on both sides of the heat exchanger is to Lorenz cycle,and the greater the COP and exergy efficiency ***,by monitoring the outlet temperature of the CO_(2) cooler,which has an essential relationship with the temperature matching degree during the heat exchange process,the deviation between actual and optimal working condition can be judged online,which is beneficial to real-time evaluation of the working state of the system.

关键词： heat pump CO_(2)transcritical cycle temperature matching degree exergy COP pinch point

Operating performance of novel reverse-cycle defrosting method based on thermal energy storage for air source heat pump

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Journal of Central South University 2011年第6期18卷 2163-2169页

作者：董建锴姜益强姚杨张雪丹 Institute of Heat Pump and air conditioning of Technology Harbin Institute of Technology

To solve the fundamental problem of insufficient heat available during defrosting while ensuring the efficient and safe system operation for air-source heat pumps (ASHPs). A novel reverse-cycle defrosting (NRCD) method based on thermal energy storage to eliminate frost off the outdoor coil surface was developed. Comparative experiments using both the stand reverse cycle defrosting (SRCD) method and the NRCD method were carried out on an experimental ASHP unit with a nominal 2.5 kW heating capacity. The results indicate that during defrosting operation, using the NRCD method improves discharge and suction pressures by 0.24 MPa and 0.19 MPa, respectively, shortens defrosting duration by 60%, and reduces the defrosting energy consumption by 48.1% in the experimental environment, compared with those by the use of SRCD method. Therefore, using the NRCD method can shorten the defrosting duration, improve the indoor thermal comfort, and reduce the defrosting energy consumption in defrosting.

关键词： air source heat pump thermal energy storage phase change material reverse-cycle defrosting