bluuebunny/crossref_metadata_2025 huggingface dataset:
Integrated Design of Solar Energy Utilization and Building Based on PLC
Authors: Zhou Li , Chen Bo , Liu Yang
Published: November 2020

At present, fossil energy consumption still occupies a dominant position in China’s energy consumption structure, and problems such as low energy consumption efficiency, high degree of carbonization and large environmental pollution persist for a long time. Under the background of advocating environmental protection and energy saving, the combination of solar energy and building is the inevitable trend of building energy saving development, and the integrated design of solar energy and building has become a concern of the architectural circles. With the deepening of people’s understanding of environmental problems and the further deterioration of energy problems, more and more buildings begin to use clean and energy-saving solar energy devices. At present, the construction and development of urban residential buildings in China are mainly multi-storey and high-rise buildings. Therefore, higher requirements are put forward for the application form and scale of solar water heating system in residential buildings. In this paper, according to the current situation of solar energy utilization in buildings in China, based on PLC (programmable logic controller), the paper puts forward some suggestions to promote the integrated design of solar energy buildings.
Research on Stability of Gabion Slope on Seepage-stress Coupling
Authors: Ning Song , Zhenxue ZHU , Chao SU , Jian-jian Dai , Fan Zhu
Published: November 2020

Based on an example of a basalt fiber gabion ecological slope protection project, this paper uses ABAQUS finite element software to conduct seepage-stress coupling modeling and calculation for the undisturbed slope and gabion protection under two conditions of low water level and design water level. Based on the theory of direct coupling method and strength reduction method, the slope instability evaluation criterion is based on the displacement mutation of the model and the formation of the plastic penetration zone of the soil. The safety factor of the coupled gabion protection is greater than that of the original slope. The results show that the overall stability of the slope after being supported by stone cages and grid protection pads is enhanced, which shows the feasibility and good application prospects of the engineering practice of stone cage slope protection. The research conclusions of this paper can provide reference for the study of seepage-stress coupling in water conservancy projects and provide reference for the stability analysis of similar engineering slopes.
Analysis on the development level of Eco-Cars in China
Authors: Zhang Ting , Zhou Maoxiang , Zhao Mingnan , Shujie Xu
Published: November 2020

This paper first analyzes the development environment of China’s Eco-Cars from the government guidance and industry status quo, and points out that the Eco-Car has become the development trend. Secondly, it introduces the vehicle ecological and health performance indicators that the industry pays attention to. On this basis, it makes statistical analysis on the performance of the main ecological performance indicator. In addition, the proportion of vehicles with excellent ecological performance is analyzed. Finally, this paper expounds the development suggestions of the Eco-Car in China.
Evaluation Method of Regional Geothermal Resources-A Case Study of Yingzhou District, Fuyang, Anhui Province
Authors: Yang Jie , Hu Lin , Wang Wei , Wang Yang , Tao Yuezan
Published: November 2020

Geothermal is a kind of renewable, clean and environmental protection new energy. In the process of exploiting geothermal energy by groundwater heat pump (GWHP) system, the regional geothermal water resource is the basis of the system running continuously. In this paper, taking Yingzhou District, Fuyang, Anhui Province as an example, a conceptual model of thermal reservoir is proposed according to the general situation of regional hydrogeology, considers the main thermal storage parameters, and combines with the pumping test data of a geothermal well of the project to calculate the exploitation quantity of single well geothermal water. Then, the regional geothermal reserves, recoverable geothermal water and total heat are evaluated. The results show that the total recoverable geothermal water resources of the Neogene Guantao formation and the Paleogene Jieshou formation in the project area are 9.093 million m3/a, and the recoverable geothermal resources amount is 9.6795×1016 J, which reaches the medium-low temperature and medium-sized geothermal field scale. Furthermore, the recoverable resources of geothermal water in the reservoir obtained by the method of average well distribution satisfy the condition of water-heat balance, which will be applied to the evaluation of regional geothermal resource exploitation.
Simulation of Optimized Air Supply for Air Conditioning Systems in Large Spaces
Authors: Li Pengfei , Yang Liquan , Lu Jing , Liu Zehua
Published: November 2020

Simulate and compare the air distribution when the air outlets on both sides of the stratified air-conditioning are arranged on the same horizontal plane and the air outlets on both sides are arranged at different levels to study the distribution law of temperature and velocity fields in the workshop. The simulation results show that under the same air supply conditions, when the air outlets on both sides are arranged at different levels, the air velocity in the workshop is lower and the velocity field distribution is more uniform. The temperature distribution effect of the two in the workshop is almost the same.
Research on the Strategy of Rural Territorial Space Renovation under the Background of Rural Revitalization -- Take Gaozhai Village, Xing’an County as an Example
Authors: Lai Lingling , Tengand Hanshu , Wang Jinye
Published: November 2020

Rural Revitalization is a major national strategy in the new period, and how to implement the land space renovation and ecological restoration with “landscape, forest, farmland, lake, grass” system as the main content has become a major problem directly affecting rural development. Taking Gaozhai village in Xing’an County as an example, the paper analyzes the problems existing in the territorial space renovation by analyzing its land space situation, and puts forward corresponding suggestions and specific measures, so as to provide reference for improving the ecological conditions of rural production and living and comprehensively realizing the Rural Revitalization.
Environmental Planning and Economic Resources Optimization Modelling: An Empirical Approach Based on the Earth Ecological Economic Metaphor Principle
Authors: You Yucong
Published: November 2020

This paper is with an objective of exploring a top-level design system model for environmental planning and economic resource optimization. Based on the economic metaphor theory of the earth’s ecological environment, of which “economic man” and “ecological man” are both involved, this study has self-built a WEMC corpus for empirical purpose. The study’s findings have revealed that, environmental planning and the optimization of economic resources reflect the relevant “eco-systemicity” from the perspective of economic metaphor, which is embodied in three major ecological categories (human, plant and animal) discovered in this empirical study; therefore, it is necessary and highly feasible to, based on the theory of systems engineering and ecological mechanics, explore and analyse the constituent factors, functions, stability, and evolution of the economic ecosystem from a new perspective and method. This paper has drawn a conclusion and proposed a top-level design system model for environmental planning and economic resource optimization based on the ecosystem integration.
Exploration on Planning Compilation of Characteristic Protection Villages from Perspective of Village Renewal: A Case Study of Gaozhai Village in Xing’an County, Guangxi
Authors: Hanshu Teng , Yinli Bi , Lingling Lai
Published: November 2020

The theory of village renewal originated from Germany, which has rich experience in theory and practice of village renewal. From the perspective of village renewal theory, the authors explores the planning compilation method of characteristic protection villages in this paper. Taking Gaozhai Village in Xing’an County of Guangxi as an example, the authors discusses the planning compilation strategies of characteristic protection villages from the aspects of data collection and current situation investigation, orientation and goals of village development, land space of life, production and ecology, ecological environment protection, renovation of villager’ residential areas, layout of industrial development, public service infrastructure, and consultation so as to provide reference for the compilation of village planning.
Diffusion Test and Prediction of PM2.5 Concentration in Urban Street Traffic Microenvironment
Authors: Ni Yanshu , Ma Lianglin
Published: November 2020

A detailed test plan was developed by analyzing the factors affecting PM2.5 diffusion in the urban street traffic microenvironment. After field investigation, several test streets within the third Ring Road of Harbin city were selected to investigate and test the hourly traffic flow of the streets, and the geometric structure of the block (road width, building height) was measured. The research carried out tests on the PM2.5 concentration, wind speed, temperature and relative humidity of actual street test points. Based on the actual test data, BP artificial neural network and the improved LMBP neural network were used to carry out simulation research on MATLAB platform respectively. A PM2.5 concentration prediction model was established to compare and analyze the reliability of the model. Scientific and reasonable prediction of PM2.5 pollution in the traffic microenvironment in a specific area.
Effects of a Commercial Deactivator on the Deactivation of Phosphorus in Simulated Lake Water and the Influencing Factors
Authors: Chun Zhang , Zhang Jinliu , Cao Wenfang , Zhen Ma
Published: November 2020

To study the influence of external factors on the deactivator effect of a commercial deactivation under field conditions, the effects of different dosage, pH, oscillation time, oscillation frequency and initial phosphorus concentration on the deactivation effect of simulated lake water were studied. The results show that when the other conditions are the same, the deactivator has the best deactivation effect when the dosage is 0.07g, the pH is 6-9, the oscillation time of the deactivator is 45 minutes, the oscillation frequency is medium speed (180r/min), and the initial concentration of phosphorus is not more than 3mg/L. Orthogonal experiments show that the best deactivation effect is that the initial concentration of phosphorus is not more than 3mg/L, the oscillation frequency is medium speed (180r/min), and the dosage is 0.06g. The main effect of SPSS software is analyzed: the influence of initial phosphorus concentration, oscillation frequency and dosage on deactivation effect of the deactivator decreases in turn.
Intelligent anti-collision warning method of fairway buoy based on passive underwater acoustic positioning
Authors: Chen Shuai , Xiang Haowen , Gao Shuangyin
Published: November 2020

In recent years, there have been frequent safety accidents of ships striking fairway buoy, which has aroused great concern. This paper firstly analyzes the causes of the collision of ships with navigation marks, and then proposes an intelligent anti-collision warning method of navigation marks based on passive underwater acoustic positioning. This paper has designed a kind of intelligent anti-collision navigation marks. The underwater acoustic transducer is installed under the navigation marks to complete the acquisition of distance information between the ship and the navigation marks. When the dangerous ship enters the dangerous water area set in this article, through the early warning matrix lights mounted on the navigation marks and the AIS information center, targeted warnings are given to dangerous areas where dangerous ships are located. The supply-energy analysis results show that this intelligent anti-collision warning navigation mark generates more electricity per day than its power consumption, and at the same time, the rich electricity can be filled with lithium iron phosphate batteries, which guarantees the daily work of this navigation marks and provides stable power support for all parts of the navigation mark. This intelligent anti-collision early warning method can give full warning to dangerous ships, avoid the collision of ships with navigation marks, and ensure the safety of navigation at sea.
Failure Analysis of the Autoclave Sterilizer Fracture
Authors: Chengjun Jiang , Kai Tao , Yannan Du , Wei Wang
Published: November 2020

The fracture reason of the autoclave sterilizer was analyzed by metallographic examination, fracture analysis and chemical composition analysis. The results showed that failure of the autoclave sterilizer was due to stress concentration at the closed angle of poor fusion area by cyclic stress via vacuumizing and filling water vapor.
Study on Damage Energy Consumption Characteristics and Mechanical Behaviour of Mixed Aggregates Cemented Backfill Before Peak Stress
Authors: Hongbin Liu , Aixiang Wu , Yongqiang Hou , Chaoqun Dai , Shixing Yang , Yong Wang
Published: November 2020

Mixing coarse aggregates into cemented paste backfill can significantly affect its mechanical properties. Many mixed aggregates cemented backfill samples were carried out uniaxial compression tests to see how the coarse aggregate replacement rate affects its uniaxial compressive strength, and analyze the influence on the damage energy consumption characteristics of the backfill before peak stress based on damage mechanics theory. Then taking Jinchuan No. 2 Mine as an example, study the stability and mechanical behaviour of the backfill in the stope by means of numerical simulation. The results show as following: The uniaxial compressive strength of the backfill at different curing ages has a quadratic function curve relationship with an increasing coarse aggregates replacement rate. This indicates that there exists an optimal replacement rate of 60%. When the content of coarse aggregate exceeds the optimal value, the strain value of the backfill sample corresponding to the peak stress damage value decreases, which means that the more the content of coarse aggregate, the more the backfill sample is prone to brittle failure. The peak stress specific energy increases first and then decreases with increasing coarse aggregate replacement rate, shows a similar change with its uniaxial compressive strength, so the backfill with the higher uniaxial compressive strength have stronger energy storage mechanism. The numerical simulation results show that the backfill with the optimal coarse aggregate replacement rate can effectively relieve the stress concentration of the rock mass in the stope, however the filling body has obvious tensile damage due to the mining activities.
Research on Intelligent Matching Technology of Marine Electric Propulsion System Based on Fuzzy Multiple Decision Making
Authors: Chen Xiaomi , Hao Chunxue
Published: November 2020

Based on matching process of ship electric propulsion system and the fuzzy multiple decision technology, an intelligent matching method of ship electric propulsion system is proposed with the establishment method of factor set, decision set and fuzzy linear transformation in line with the ship electric propulsion system. The decision result from this method is found to be dependent on the maximum membership principle or the score system. By an example, the fuzzy multiple decision-making method is simple in calculation, in line with actual situation and also provides a guidance in the design of ship electric propulsion system. Further related methods and directions are discussed in the end.
Study On Imbibition Fluid Preferred And Injection Parameters In Fractured Tight Reservoir— A Case From Daqing Toutai Oilfield
Authors: Da Li
Published: November 2020

In the process of the development of fractured tight reservoir, there are some problems such as high injection pressure and poor effectiveness of production. At present, tight reservoirs mostly adopt fracturing development. When injection pressure is higher than fracture opening limit, connected oil wells show severe flooding, water-flooding efficiency is extremely poor. In order to solve the technical problems of fractured tight reservoir development, In this paper, based on the physical and chemical characteristics of surfactants, and by means of instrumental monitoring and numerical simulation, the optimization of the composition of the perming-absorbing liquid and the optimization of the injection process parameters in the tight oil reservoir in Daqing Toutai were studied and simulated. The results show that the capillary force is the main force in the process of osmosis and oil recovery, and the surfactant can change the rock into water wetness, which is beneficial to osmosis and absorption, and the oil washing effect of surfactant also improve the oil displacement efficiency. But it reduces the interfacial tension between oil and water, reduces the capillary force, and is not conducive to the imbibition. Therefore, it is necessary to choose a suitable concentration of the imbibition liquid to take account of both wettability and interfacial tension. Toutai oil field has poor sensitivity and stronger adaptability to solvent water mineralization. Nonionic surfactant solution(DWS, 0.2 %) is recommended for the imbibition in the target area of the Toutai oil field, injection process parameters range: the injection timing (water cut during injection) is 40 % to 60 %, the injection volume is 4000m3 to 5000m3, the well shut-in time is two months to three months, the cycle of huff and puff is 1.5 to 2.0 years, and the injection velocity is 30m3/d to 40m3/d. It provides the basis for the target reservoir technology decision and has important theory and application value.
Design of Control System for Multi-joint Robot Based on STM32
Authors: Bin Ren
Published: November 2020

The motion of Bionic Hexapod spider robot is relatively flexible. It has high comprehensive performance and research value whether it is the stability of motion, the load capacity of fuselage, or the difficulty of control. In this project, a Bionic Hexapod spider robot with STM32 chip as the core control is designed. Combined with the actuator control board design action, the STM32 chip built-in timer is used to generate multiple PWM signals to drive the steering gear motion, so that the robot can achieve different posture. At the same time, a wireless remote controller based on NRF24L01 wireless module is designed to expand the usability of the project. On the basis of the simulation, the actual operation principle of the robot is verified, which lays a good theoretical foundation for the continuous improvement of the robot in the future.
Research on post treatment of lock pipe fracture in diaphragm wall construction
Authors: Shen Yaohui , Feng Zhengwei
Published: November 2020

Lock pipe is often used as connection joint in the construction of diaphragm wall. After pouring concrete, it often fails because of poor control of drawing time. In this paper, combined with an engineering example, the post-treatment of drawing fracture is described in detail. During the construction, it is necessary to chisel out the locking pipe on one side of the foundation pit and the nearby concrete, then cut off part of the locking pipe, make reinforcement cage in the excavation groove, weld with the original connecting wall reinforcement, and pour concrete to cover it. The possibility of rust and expansion of residual locking pipe was analyzed, and the treatment method was verified to be effective by the use of several years later.
Research on internal control management optimization of power grid enterprises - a case study of China
Authors: Hu Qiliang
Published: November 2020

With the progress of society and the development of science and technology, both enterprises and individuals are inseparable from electricity, and the trend of electricity demand is growing, which is a favorable market opportunity for the development of power grid enterprises. It is of great significance for the operation and development of power grid enterprises to improve their internal control management on the basis of good market opportunities. Combined with the internal control management method, this paper analyzes the current situation of the internal control management of power grid enterprises, and concludes that the internal control management function positioning of power grid enterprises is not clear, the management consciousness is weak, the evaluation system is not perfect and so on. Together with the present situation of China’s power grid enterprise internal control management countermeasures and suggestions are put forward. For example, to create a good enterprise internal control environment, improve the internal control system of power grid enterprises, improve the enterprise internal control management evaluation system, integration of power grid enterprise risk assessment and internal control management. In this way, the operation efficiency of power grid enterprises can be improved, so as to promote the healthy development of China’s power grid enterprises and seek more benefits for the society.
Analysis on thermal characteristics of high back pressure heating retrofit for large-scale steam turbine units
Authors: Dong-tao Cheng , Ting-shan Ma , Li-fei Zeng , Zhe Ning , Yan Wang
Published: November 2020

High back pressure heating with large-scale steam turbine units boasts preponderant heating capacity and preferable integrated utilization of energy while suffering high operation and maintenance cost and low operation flexibility. First, the high back pressure heating retrofit technology is introduced. Then, a model to analyze off-design performance of turbine and condenser for a 350MW heating unit was established using EBSILON software, by which quantitative calculation was performed of the influence of the key factors, so as to attain thermal characteristics of high back pressure heating. Finally, the paper was ended with multivariate analysis of the key factors in a combination of the theoretical analysis, the calculation results and the actual operating environment of the 350MW heating unit, in a bid to outline a change range of each factor. It thereby provided reference for selection of key parameters, feasibility analysis and operation economic analysis in high back pressure heating retrofit.
Research on New Generation Power Information Acquisition Technology Based on BPLC and Bluetooth5.0 Technology
Authors: Guo Guang , Huang Rui , Yin Xiaobo , Liu Mouhai , Wang Haiyuan , Zhou Gang , Hu Junhua
Published: November 2020

With the continuous development of wireless communication technology, more and more applications are used in industry and home. As the bluetooth 5.0 technical specification put forward, Bluetooth Low Energy has a great improvement in communication performance and power consumption. In this paper, the broadband power line carrier (BPLC) was taken as the main trunk channel, and creatively integrated an information acquisition scheme with the Bluetooth Mesh as the network extension. Besides, the Dijkstra algorithm based on speed factor was used to complete the system routing planning, and a new generation of power information acquisition scheme was proposed.
Study on the uncertainty of TSP emissions in dry bulk terminals
Authors: Wang Zheng
Published: November 2020

Aiming at the problem that TSP emissions in dry bulk terminals are uncertain due to the selection of parameters, the influence of different parameters on the uncertainty of particulate emissions in dry bulk terminals was studied. The study established the TSP emission system dynamics model for dry bulk terminals, and quantitatively calculated the TSP emission uncertainties of four parameters, namely “Water action coefficient, homework divide”, “Water in material”, “Operation TSP up to the maximum TSP up to half of the wind speed”, under the normal distribution. The results show that the wharf TSP emission is greatly influenced by parameters, and the maximum emission fluctuates as high as 122% compared with the expected value. The ship loading and Translation operations are greatly influenced by the value of the discharge parameters, and the TSP emission stored in the yard is hardly affected.
Effect of acid on the strength of solidified sewage sludge
Authors: Hong Siyuan , Du Hongxiang , Guo Weijian , Wu Tianyu , Wang Zheng , Li Lei
Published: November 2020

The solidification technology can meet the requirements of landfill by enhancing the sewage sludge strength. The solidified sludge strength would be decreased by landfill leachate action because the acid could dissolve the hydrated materials. Chemical kinetics equation was obtained by reaction order α, β and rate constant k, which reflected the acid effect on hydrated materials by Ca2+ and were got based on the laboratory experiments. The research results showed that the strength loss could be neglected in engineering because pH value of leachate possessed less impaction on solidified sludge strength. Moreover, after adding clay minerals, the strength loss is smaller and the buffering capacity is stronger.
Effect of CeO2 on the Structure of Silicate Glass Cured Body
Authors: Liang Li , Xianhe Mao , Yalu Zhao , Han Yin , Yongwang Dong
Published: November 2020

In this paper, samples of xCeO2·(100-x) (SiO2·Al2O3·CaO) (x: 0∼15) glass solidified body was prepared by a high temperature melting method. The structural characteristics and thermal stability of CeO2 silicate glass-cured bodies were characterized by means of density porosity test, XRD, Raman, DSC and SEM. The results show that the addition of CeO2 does not change the basic structure of the glass, which is located in the pores of the silicate glass grid and plays a network modification role. When the added amount is less than 5% wt, homogeneous glass is easily formed. CeO2 is uniformly distributed in the glass body, and no enrichment occurs. When the added amount is more than 8% wt, CeO2 easily crystallizes during cooling.
Experimental study on the separation of a shrend copper slag
Authors: Shi Guiming , Wang Chengdong , Zhu Lang , Zeng Li , Wang Jie , He Chunyan , Zhou Yichao
Published: November 2020

An experimental study on copper separation from a shrend copper slag in Yunnan province was carried out. The test contents included: grinding curve test, grinding process determination test, comparison tests of different flotation processes. The results shown that: the main ingredients of shrend copper slag were iron, silicon and the main valuable metallic elements were Cu, Fe, grade of 0.70%, 40.14%, consistent with the main components of the copper smelting slag. When the grinding time exceeded 35 minutes, the grinding fineness curve tended to flatten, indicating that the grinding effect was not obvious after the time exceeded 35 minutes, and the grinding fineness did not change much, which may be the shrend copper slag crystallized into a dense structure during the cooling process. Finally, the two stages grinding and regrinding process was adopted. Under the fineness of -0.074 mm 70% on the first grinding, the fineness of -0.037 mm 100% on the second grinding, and the fineness of -0.026 mm 85% on the regrinding, the process of regrinding and recleaning for combined cleaning middling of sulfide copper with roughing and scavenging middling of oxidized copper was suitable for the shrend copper slag.
Application of high density electricity method in detection of concealed water conveyance tunnel
Authors: Du Bin , Ge Lonjin , Xu Zheng , Li Junjie
Published: November 2020

We used the high density electricity method to detect underground water conveyance tunnel in a project, then we compared the difference of apparent resistivity profiles between Schlumberger device and Winner device. Lastly, we analyzed the difference between the combined inversion method and the Levenberg-Marquardt method in Res2dinv software, and inferred the trend and depth of underground water tunnel through the results of electrical detection. Several conclusions are drawn as follows. Firstly, the resistivity anomaly of underground tubular object is more prominent in Schlumberger device than in Winner device. Secondly, the Levenberg-Marquardt inversion method which contained in Res2dinv software can easily conceal the horizontal resistivity variation characteristics of small-scale tubular anomalous body and the horizontal resolution of the original apparent resistivity profile is higher than that of the inversion result. Thirdly, the combined inversion method can improve the horizontal resolution of resistivity method for detecting tubular anomalous body with larger burial depth and smaller scale.
The Stirring-assisted Liquid Exfoliation of Hexagonal Boron Nitride and the Performance of h-BN/Cellulose Aerogel
Authors: Bo Yuan , Tian Ma , Yun Lu , Yue Kang , Chanjuan Liu
Published: November 2020

The delamination is the focus of two-dimensional layered materials’ nano-crystallization. In this paper, two methods of stirring-assisted liquid exfoliation, DMF exfoliation and Hummers exfoliation, were utilized to prepare h-BN nanosheets. Microstructure, crystal structure and chemical structure were analyzed, which indicated that the h-BN nanosheets, with thickness of 1.4 nm and 5.4 nm respectively, were delaminated from bulk h-BN and their structure didn’t show any obvious change, in accordance with the theoretical model. The interaction of oxygen in DMF and boron in h-BN weakened the “lip to lip” interaction between neighboring layers and then nanosheets were gained under violent stirring. Due to excellent corrosion resistance, bulk h-BN couldn’t be exfoliated by strong oxidants. H+ protonated h-BN and only weakened slightly the “lip to lip” interaction. As a result, Hummers exfoliation wasn’t doing well compared with DMF exfoliation. The h-BN/nano-fibillated cellulose aerogel had a very bag surface area and the air filled in these pores, which gave it the performance of thermal insulation and oil absorption.
Preparation and electrical properties of Pb(Yb0.5 Nb0.5)O3 - PbHfO3 -PbTiO3 ceramics
Authors: Cheng Zhi , Pang Jinbiao , Yan Yangxi , Li Zhimin
Published: November 2020

This topic selects the ternary system Pb(Yb0.5Nb0.5)O3-PbHfO3-PbTiO3 ceramics for research. The preliminary phase diagram analysis of the ternary system can preliminarily determine the morphotropic phase boundary (MPB) of the ceramic system. This article also characterizes the electrical properties of the samples, tests their dielectric temperature spectra, determines the Curie temperature and its components, and further determines the phase boundary based on the ferroelectric properties. The samples are polarized under appropriate conditions and the piezoelectric coefficient d33 is tested. Finally, determine the best preparation process to analyze the properties of samples prepared under different conditions, and obtain high-quality ceramic samples.
CO2 plume evolution in the saline aquifer under various injection operations for CCS
Authors: Dong Xuelin , Duan Zhiyin
Published: November 2020

Carbon capture and storage (CCS) projects inject large amounts of CO2 into deep saline aquifers or depleted oil and gas reservoirs. This operation requires a leakage risk analysis for the injected CO2. The subsurface flow of CO2 at the injection formation is dependent on injection operations. This study proposes a method to combine a wellbore flow model and an analytical solution to the CO2 plume to investigate the influence of the injection temperature, pressure, and rate on the interface evolution between the CO2 and the brine. Using the wellbore flow model, the proposed mothed estimates the volume injection rate at the bottom hole under different injection parameters. Then it illustrates the effects of injection operations on the CO2 plume and its maximum radius at the interface between the caprock and formation. The results provide an estimation of the plume radius under different injection rate and duration that would help field operators manage leakage risks.
Analysis of Research Status of Modified PVDF Ultrafiltration Membrane
Authors: Yang Siyuan , Yang Dandan , Ren Wenjie , Liu Jinyu , Mou Jiankun , Wang Ying
Published: November 2020

The current research status of PVDF ultrafiltration membranes is introduced, and the limitations of current PVDF membranes are described. In view of the existing problems such as easy pollution and clogging, low cleaning efficiency and low hydrophilic permeability, corresponding improvement measures have been found, the performance of the membrane has been greatly improved. In addition, the application prospects of ultrafiltration membranes are properly introduced.
Residue occurrence and potential risk assessment of HCHs and DDTs in campus surface soils: In case of Jilin University in Changchun, China
Authors: Lu Jilong , Zhao Wei , Wei Qiaoqiao , Hou Yaru , Si Junshi , Li Tong , Zang Libin
Published: November 2020

Hexachlorocyclohexane(HCH) and Dichlorodiphenyltrichloroethane (DDT) are typical Organochlorine pesticides (OCPs), which were widely used in pest control and insect infestation in China. This study aimed at researching the concentration, potential sources and potential risk of HCH and DDT in Jilin University in Changchun, China. A total of 45 surface soil samples were collected from five land-use types in Jilin University campuses, the contents of were determined by Gas Chromatography and Mass Spectrometry (GC-MS) with Soxhlet extraction pretreatment technology. The overall HCHs existed the pollution in some campuses, while the DDTs were relatively low without pollution. Results of composition analysis showed that HCHs in campus soils mainly came from the mixed use of technical HCHs and lindane, and DDTs were mainly from the input of historical dicofol products. The potential health risks of HCHs and DDTs to campus populations were very low, while the potential ecological risks of HCHs and DDTs individual isomers should be paid attentions to.
Effect of Internal Resistance on Consistency in a set of Batteries at Low Temperature
Authors: Wang Hongwei , Liu Jun , Zhao Weizhe , Zhu Yusong , Hu Bin , Fu Yanling , Tao Ziqiang
Published: November 2020

An electric vehicle needs to use multiple individual batteries in a set to meet the requirements for use. This then imposes very strict requirement for the consistency in performance among individual batteries. This article has studied the internal resistance on the consistency in a set of batteries at low temperatures. The result indicates, the inconsistency of internal resistance among individual batteries connected in series in a set will hinder the performance of the batteries set. During the process of recharge, because of the difference in internal resistance, the recharge voltages applied to individual batteries in serial connection are different, resulting in the inconsistency in recharge voltage among batteries. And as the process of recharge goes on, the voltage of the battery with higher internal resistance may reach the upper limit on recharge voltage early. As far as the batteries in parallel connection in a set is concerned, because of the difference in internal resistance, the recharge currents distributed among individual batteries are different, with the voltages of the batteries at higher recharge currents to rise fast.
Experimental study on power generation of PV material façade in three typical cities in East China
Authors: Zhou Li , Chen Bo , Liu Yang
Published: November 2020

In this study, experimental investigations on photovoltaic (PV) façade systems were conducted to study the electrical power generation in three typical cities in East China. The window glass consists of 6mm thick semi-tempered glass, polyvinyl butyral (PVB)/ethyl vinyl acetate (EVA) film, solar cells, PVB/EVA film, and 6mm thick semi-tempered glass. The walls are made by insulation yanmian with an inner thickness of 12 mm. Test facility was established in Beijing, Wuhan, and Guangzhou, respectively. The building process and test details were introduced. The current-voltage (I-V) curve and the power-voltage (P-V) curve of the present PV façade were obtained and the voltage corresponding to maximum power point (MPP) is 17 V. Daily, monthly, and yearly electrical power generation in the three cities were obtained to show all-around PV performance in East China. Beijing has the maximum power output (∼180 kWh) for horizontal panels, larger than those panels faced at south direction. While in Wuhan and Guangzhou, the maximum power outputs only are ∼140 kWh also with horizontal panels. Besides, it also discovered that orientation is the key parameter in Beijing and Wuhan, while orientation is not the key parameter in Guangzhou.
Research on the material of current-carrying vessel used for current transfer type fault current limiter
Authors: Sun Chao , Liu Xuan , Dong Enyuan , Zhang Liyan , Zhu Yu , Xue Shutian , Wang Yinong
Published: November 2020

In recent years, there has been more and more research on current transfer type fault current limiter. Titanium diboride is used as the pressure-controlled materials in the field of current transfer, which has high application value and research significance. The current transfer type fault current limiter has two working states: when the circuit is operating normally, a certain amount of current passes through the current limiter in a steady state; when a circuit fault occurs, the current transfer type current limiter acts to form a circuit potential difference and promote current transfer to other branches. Titanium diboride, as a material for the normal operation of the transfer fault current limiter access circuit, will produce current heating when it is supplied with current. This phenomenon may affect the entire circuit and the life of the current limiter. This article uses Ansys Simulation analysis to study the thermal phenomenon of titanium diboride passing current has guiding significance for the production and realization of current transfer fault current limiter.
A framework for mapping stakeholders interests related social sustainability in residential building
Authors: Rivai F R , Rohman M A , Supani
Published: November 2020

Dwelling is the primary necessity of every human being. Population growth and urbanization movements without being matched by land availability in urban areas make the need for residential buildings higher. Land use from horizontal to vertical patterns gives not only advantages but also disadvantages. Buildings need to adopt sustainable construction concepts to provide maximum benefits in short as well as long term throughout their life cycles. Social sustainability is one aspect of sustainable development that has a relationship with community needs. The different roles of each stakeholder make them have a different interest too and very important to fulfil it, so it is necessary to identify each stakeholder’s interest. Commonly used method only indicating which stakeholders or criteria are more significant separately does not explain how stakeholders can influence it. To bridge the research gap, this paper aims to propose a framework that can analyze stakeholders’ influence to achieve social sustainability. The result of paper is a model using two-mode social network analysis to map stakeholders and their claims relating to social sustainability in residential buildings. The model can show the importance of the social sustainability criteria and stakeholders who have a significant role and should be prioritized more comprehensively.
Identification of fire safety indicators for shopping centre buildings in Surabaya
Authors: Marantika G F , Rohman M A , Rachmawati F , Wiguna I P A
Published: November 2020

The convenience of shopping and getting entertainment at the same time is an advantage which is offered by the shopping centres. But the different functions of building and the crowds of visitors at the shopping centre inflict a greater risk of fire. Therefore, the safety against fire needs to be considered by the shopping centres in order to make users and the building structures more secure. Current fire safety regulation is still dominated by the standards and the codes from NFPA. The lack of conducting researches and knowledge related to fire safety affects the suitability and the application of regulations in Indonesia. This research aimed to identify the fire’s safety criteria according to the current local conditions of shopping centres. A survey was conducted by distributed questionnaires. The variables used in the questionnaire were obtained based on the literature studies and then it was assessed by several experts. According to the experts’ judgment, all variables are relevant with the current local conditions and there were three new variables added in this research. The result showed that the construction practitioners needed to improve their knowledge related to the fire safety in shopping centre starting from the initial stages of design.
The role funding based non cash loan in the form of supply chain financing on elevated road project performance (case study join operation project PT.X)
Authors: Stani S A
Published: November 2020

Indonesia infrastructure road development in recent years has experienced a very significant increase, but in its implementation the issue of land acquisition and limited funding are the main problem in realizing this development. Elevated Road Project is one of the way to minimize the effect land acquisition, and also Joint operation (JO) and applying Non Cash Loan (NCL) at the form Supply Chain Financing (SCF) in project can have good performance effect that can be see positif Project Cash Flow (PCF). Supply Chain Financing (SCF) is a financial instrument issued by financial institutions with various terms and conditions applicable to a supply chain that occurs between buyers and sellers, which aims to optimize the management of working capital and company liquidity. However, the selection of the SCF financing scheme also has a weakness where there is a cost of money that must be spent in the process. The purpose of this study was to determine the NCF SCF Cost Structure and evaluate the implementation of the use of SCF facilities on the elevated road project performance with a JO project case study at PT.X. Research methodology using survey and project cases study, while for the conducted to determine cost structure using statistical descriptive analysis. This study produce cost structure table which is majority for material, equipment, and sub contractor can be implemented using NCL SCF, also implementation procurement procedure using SCF until invoicing.
Adoption and implementation of building information modeling (BIM) by the government in the Indonesian construction industry
Authors: Sopaheluwakan M P , Adi T J W
Published: November 2020

Building Information Modeling (BIM) is the development of concepts of collaboration and integration in the construction industry. This concept was introduced in Indonesia formally by the Ministry of Public Works and Public Housing (PUPR) in 2017. Since its introduction, by the Indonesian government the PUPR ministry has made BIM Roadmap, created BIM Team PUPR, and issued ministerial regulations mandating the use of BIM on a state-owned building. BIM provides many benefits that can be utilized by every stakeholder involved in the project. Previous research has focused more on the readiness of the Indonesian construction industry in utilizing BIM. However, studies that focus on the implementation of BIM by the Indonesian government are still very limited. A literature review is used as the main method in this journal to collect information from government publications. This study provides updated information related to government efforts to implement BIM in Indonesia.
Risk allocation of PPP waste to energy projects in Indonesia: A research framework
Authors: Utama W P , Wibowo A , Jumas D Y , Rita E , Peli M , Yulcherlina
Published: November 2020

Public-Private Partnership (PPP) scheme has been widely adopted in both developed and developing countries to fulfill the need of infrastructure facilities such as toll roads and water supply. In Indonesia, another sector that would be feasible to be developed using the scheme is the energy sector through Waste to Energy (WTE) projects. However, the lack of knowledge and experience of public sectors on the PPP field particularly risk-allocation issues may barrier the project success. This paper presents a research framework to develop a model of risk allocation decision making for PPP WTE projects in Indonesia. A combination of qualitative (literature review and semi-structured interview) and quantitative (Delphi survey) research method is utilized to identify critical risk factors in PPP WTE projects. To develop a risk allocation model, an Adaptive Neuro-Fuzzy Inference System (ANFIS) with two outputs (public and private risk share) is proposed. A set of surveys to collect data for training and checking will be distributed to PPP experts representing government and private sectors in Indonesia, while selected WTE projects are used for data testing. The proposed model is a novel approach in risk allocation PPP research and would be useful for local authorities in Indonesia in proposing the WTE project using the PPP scheme.
The effect of m-sand and waste marble for strength of concrete
Authors: Hidayawanti R , Yuhanah  , Mayasari D , Wicaksono B
Published: November 2020

Concrete is a construction material composed of cement, water, and aggregate in the form of sand and gravel. Furthermore, Indonesia experiences a yearly increase in the need for building material, including concrete, due to the rise in development. Smooth and coarse aggregate materials are required to manufacture concrete with the inappropriate disposal of waste marble, adversely impacting environmental pollution. Therefore, tremendous efforts need to be carried out to reduce environmental problems associated with the disposal of waste marble to provide adequate economic value for construction and reduce the collection of rough aggregates in the river. A lot of industrial companies are needed to produce a coarse aggregate with various size variants, thereby, manufacturing waste, also known as M-Sand. The stone ash is one of the numerous coarse aggregate materials that are less desirable in concrete production. Therefore, this study was carried out to determine the compressive strength and water absorption content between fine and coarse concrete using a variety of coarse aggregate replacement materials from the waste marble with a 40% M-Sand substitute. The results showed waste marble variations of 0%, 25%, 50%, 75%, 100% substitution of coarse aggregate with 40% M Sand substitution of fine aggregate. The optimum compressive strength was found in variation 3 (40% M Sand + Waste Marble 50%) of 35.801 MPa at 28 days, with the optimum water absorption obtained at variation 1 (40% M-Sand + 0% Waste Marble) at 1.77%. By analysing the waste marble result of R close to 1, it is concluded that this variation can act as an alternative to the composition of a concrete mixture.