bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study On Imbibition Fluid Preferred And Injection Parameters In Fractured Tight Reservoir— A Case From Daqing Toutai Oilfield
Authors: Da Li 
Published: November 2020

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.