bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recovery Characteristics of Weak Alkali ASP Flooding in Second Oil Reservoir
Authors: Huang Mei 
Published: March 2020

Abstract
Taking two weak alkali ASP flooding test blocks as the research object, the injection-production characteristics, effective characteristics, agent recovery characteristics, reservoir inhalation condition, pressure characteristics and emulsification characteristics were analyzed. The results showed that the weak alkali ASP flooding had strong injection-production ability, high oil recovery rate, improved suction condition, established effective driving pressure system, obvious emulsification, and not serious chromatographic separation. The apparent inhalation index decreased by 23%-33%, and the liquid production index decreased by 31-42%; The inhalation thickness ratio were 89.5%-92.7%, and the water cut decreased by 16%-20%; The enhanced recovery increased by over 20% in the weak alkali ASP flooding of the second oil reservoir.
Study on Formula of Retarded Acid for Acidizing and Blocking of Coalbed Methane Wells
Authors: Zhen Huanbin , Zhang Shuling , Chen Shuai , Chen Gaojie , Bian Liheng 
Published: March 2020

Abstract
Acid plugging removal technology is an effective measure to remove the pollution in the near-well zone of oil and gas reservoirs and restore the productivity of oil and gas wells. It is to use the chemical dissolution of acid solution to dissolve formation plugs, expand or extend formation fractures and holes, so as to restore and improve formation permeability, reduce oil inflow resistance or water injection resistance, thus achieving the purpose of increasing oil well production and water injection. Therefore, the acid formula is particularly important. The commonly used acid formula is the soil acid formula. However, due to the shortcomings of the Soil Acid Formula itself, as well as higher safety risks and construction costs, this paper has studied a new acid formula. X-ray diffraction analysis was carried out on the experimental slime samples from 8 wells in Linfen block of Shanxi province, and it was found that the main mineral composition of the blockage was a mineral that can react with acid. The dissolution rate and corrosion rate of the blockage were tested with Southwest Solid Acid and Soil Acid Formula. The advantages and usability of Southwest Solid Acid were found by comparing the experimental results. Through a large number of experiments, the formula of retarded acid liquor with excellent performance, economy and effectiveness has been selected.
Development technology status of low permeability sandstone oil reservoirs
Authors: Liu Xuefen , Li Jianfeng 
Published: March 2020

Abstract
The development of oil in low permeability sand stone resources is of great significance. The paper first presented the present situation of domestic and foreign technologies in water injection, gas injection, stimulation and enhanced oil recovery of low permeability sandstone reservoirs. Then the main problem in the development of oil reservoirs with ultra-low permeability was analyzed. Finally, the paper proposed the trend of the future development of these oil reservoirs.
Development of Portable Shallow Hole Inclinometer in Coal Mine
Authors: Long Chen , Jiaru Yang 
Published: March 2020

Abstract
Due to the special requirements of borehole measurement work in coal mines, in this paper, a portable shallowhole inclinometer is developed in response to the current situation of shallow borehole trajectory measurement relying on the pushing of drilling machine. This instrument is mainly composed by three parts of inclinometerprobe tubes, orifice display controllers, and conveying rods. The probe tube can be used to measure the attitude parameters such as the inclination, azimuth and tool facing angle of the borehole, and the orifice display controller works synchronously and records the drilling depth and measuring time.Finally, the track of the current borehole can be displayed in the mine. The test results show that the instrument is stable, reliable, and practical.
Optimization Design Analysis of Large Span Cantilevered Cross Bracing Truss of Tai’an Tourism Distribution Center
Authors: Jiao Hong , Liu Xiaohan 
Published: March 2020

Abstract
The main structure of Tai’an Tourism Distribution Center is a steel frame structure system. On its west side, there is a large span cantilever structure with a maximum cantilever length of 22 meters, which adopts a space steel truss structure. The cantilever structure has great visual impact and excellent ornamental value, but it also has irregular items such as irregular torsion, irregular vertical lateral stiffness, and sudden change of floor bearing capacity. The overall stress of the structure is complex, and the design and construction of seismic performance are highly required. The seismic performance of the structure is calculated and analyzed by performance-based seismic design method, and the cantilever structure is modeled and analyzed by 3D3S, a space steel structure design software. The results show that cross support is more reasonable for cantilever structure. In view of the difficulties in the design analysis, this paper also proposes effective strengthening measures to ensure the safety of the structure, and makes technical reserves for later construction of the project, which is also of certain reference significance for similar projects.
Design of Electromagnetic Wave Resistivity Logging Toolfor Underground Coal Mine
Authors: Jiguan Zhang 
Published: March 2020

Abstract
Electromagnetic wave resistivity logging is an important method in oil logging, but it has not been applied in underground coal mine due to special working conditions and explosion-proof requirements. In this paper, through theoretical analysis and simulation, an electromagnetic wave resistivity logging tool is designed, which is suitable for underground coal mine. The detection of amplitude ratio and phase difference of weak signal is realized, and its performance index meets the actual working conditions.
Finite Element Analysis on the Influence of the Change of Characteristic Parameters of Brake Pad on Structural Modal
Authors: Li Da , Zheng Zhongcai , Gao Yan , Shan Ping , Luo Wei , Liu Fengliang , Han Dongyue , Zhang Yifan , Lv Qiaoya 
Published: March 2020

Abstract
The modal coupling of disc brake disc and brake pad is one of the main causes of brake noise, so the structural modal of the disc and brake pad is very important for the research of brake noise. In this paper, finite element theory is used to analyze the influence of the characteristic parameters of the brake pad on the structural modal. We use modal analysis to calculate the modal frequency and modal shape of the brake pad that has the different thickness, the depth and width of the groove, and the chamfer. According to the simulation results, the thickness of the brake pad, thegroove depth of the brake pad, the groove depth of the brake pad and the size of the brake pad chamfer all have influence on the modal characteristics of the brake pad structure, especially, the thickness of the brake pad has the greatest influence.Therefore, changing the thickness of the brake pad and the depth of the brake pad groove can be a potential way to reduce the brake noise of disc brakes.
Experimental Study on Reconstruction of Articulated Disk Spectrum Based on LabVIEW
Authors: Zhou XiaoDong , Xing Keli , Yang Jiachen 
Published: March 2020

Abstract
In order to realize the requirements of the down-line test of the articulated disk spectrum produced by an enterprise, this paper designs a set of automatic test system for the articulated disk. The working principle of the system is elaborated. The fuzzy PID algorithm is used to realize the precise control of the angle through the LabVIEW software platform. The CAN bus is used to realize the communication between the test bench and the articulated disk under test. Finally, the reliability of the test system is verified by the actual test, and the final test bench meets the requirements of the company and is accepted successfully.
Analysis of Thrust Vectoring Nozzle with a Secondary Shock Wave Channel
Authors: Li Li , Hu Chunyan , Wang Yanqi , Bi Yundong 
Published: March 2020

Abstract
A two-dimensional fluidic thrust vectoring nozzle with a secondary shock wave channel is designed in this paper. The direct secondary shock wave channel is composed of a front vacuum chamber, a secondary flow chamber, and a rear vacuum chamber. Based on the numerical simulations using a Navier-stokes solver, the structural parameters of the secondary shock wave channel on the nozzle performance are studied.
Potential impact of Poyang Lake Hydraulic Project on hydrodynamicenvironment and fish habitat
Authors: Han Yong 
Published: March 2020

Abstract
The problem of dry water in Poyang Lake has been deteriorating, and the ecological function is declining. Hence, the construction of Poyang Lake Hydraulic Project (PLHP)was proposed. In this study, the potential impact of PLHP on fish was explored by establishing a research framework among hydrodynamics, biological behaviours, spatial distributionand abundance of aquatic organisms. Two scenarios of the current dry water situation and PLHP regulation scheme were simulated, and the variables of water depth, velocity, riverbed surface morphology, habitat area, food resources, movement ability and biological connectivity were discussed. Results show that the effect of PLHP on fish habitat has both positive and negative aspects. For the whole area, the hydraulic project improves the habitat suitability area and food resources of fish, but weakens the migration ability and connectivity with the Yangtze River. The degree of dual influencedepends on the dispatching water level. These results could provide guidancefor the reasonable operation of PLHP and the protection working of fish in Poyang Lake.
In-situ stress measurement at deep position and optimization of roadway support structure parameters in underground mines
Authors: Du Zhenfei 
Published: March 2020

Abstract
In view of the fact that the mining depth is increasing year by year and the ground pressure disaster is becoming more and more serious in a coal mine, the in-situ stress in deep areas was measured by using the stress relief by overcoring method. The confining pressure rate test and the temperature compensation test were carried out in the laboratory. In-situ stress states and its distribution law ware obtained. Appropriate mechanical parameters and support parameters were selected through research on roadway support theory. By adopting numerical simulation software, the primary support and the secondary support of roadway ware numerically simulated and compared, which can offer a scientific, reasonable and economic plan for the secondary support of roadway. After field application, the roadway support effect had been significantly improved.
Roadway rock pressure appearance law of roof-cutting and pressure-relieving retaining roadway in medium thick seam
Authors: Su Xiashou , Guo Linming 
Published: March 2020

Abstract
Through long-term monitoring of the displacement of the roof and the pressure changes of various supporting methods along the retaining section of No. 9 coal seam in the Dianping coal mine, the mechanical characteristics of the displacement of the roof and various supporting methods were analyzed. It has been found that the top layer of the roadway section has a longer aging effect and a lower value than the roof subsidence. The maximum pressure and average pressure of the side support side of the roadway are slightly lower than the pressure of the left side of the upper roadway. The initial pressure and cycle of the roadway side are slightly higher than the roadway side of the upper roadway. The constant resistance large deformation anchorage is more adaptable to the fluctuation of the roof pressure in a wide range than the door bracket.
Influence of pore width on adsorption capacity of shale-Insights from high pressure adsorption experiments on model substances
Authors: Li Xiaofu , Yuan Kun , Xu Shuang , Zhang Yeyu , Peng Xu , Wang Dongqiang 
Published: March 2020

Abstract
Shale gas has become an important unconventional resource worldwide and adsorbed gas mainly contribute to the initial gas content for shale. In this study, different model substances, including 3Å molecular sieve, 4Å molecular sieve, 5Å molecular sieve and 13X molecular sieve, were conducted by high pressure methane adsorption experiments and the results were analyzed to obtain the effect of pore width on methane adsorption capacity. The results show that methane molecular almost cannot enter the pore of 3Å molecular sieve for adsorption, only adsorption on surface can be occurred, as well as the pore of 4Å molecular can be slightly entered by methane molecular. Whereas, methane molecular can totally enter the pore of 5Å and 13X molecular for adsorption. Meanwhile, at low pressure (less than 1.0MPa), the excess adsorption amount of methane for 13X is slightly greater than that of 5Å molecular sieve. With the increasing of pressure (1-18MPa), the excess adsorption amount of methane for 5Å is greater than that of 13X molecular sieve. In the pressure ranging from 18 to 30MPa, the excess adsorption amount of methane for 13X is greater than that of 5Å molecular sieve.
Technical path analysis of clean and efficient utilization of coal in Shajingzi mining area
Authors: Yu Lan , Yang Qingfeng , Sun Ning , Li Shuang , Jia Qiang , Xiao Jiyuan , Zhang Heng 
Published: March 2020

Abstract
In Shajingzi mining area, the coal quality is very low, and many questions will be faced in the process of exploding the area. First, the author analyzed problems in resource development and utilization, and proposed the paths of clean and efficient utilization of coal, which are clean coal power generation technology (including SC, USC and near zero emission power generation technology), CHP energy saving and emission reduction technology, technical analysis of classification and quality utilization and coal transportation technology by pipeline. The author also analyzed the main characteristics in detail, which are high volatile content, high tar content, rich oil coal-high oil coal, and an ideal raw material for low temperature carbonization, tar hydro treating, semi coke gasification and CO combustion power generation. The author also summaries the advantages and disadvantages of coal transportation technology by pipeline, which is a new and efficient way of utilization. Finally, according to the development strategy of “clean, step-by-step, timely and comprehensive”, the author proposes the comprehensive industrial chain of coal, electricity and chemical industry will be the best path.
Analysis of the ASTER Image Topographic Correction Method in Complex Mountain Areas
Authors: Sun Jiaojiao , Wang Qi , Zheng Jie , Wang Zilong , Guo Yijiang 
Published: March 2020

Abstract
The phenomenon of “anisotropic reflection” caused by gradient and aspect changes in complex mountain areas has large disturbance on the spectral information of ground feature in remote sensing images, which will further affect the inversion of surface information based on the spectral characteristics of ground feature. Topographic correction is an effective means to weaken the topographical effect and improve the inversion accuracy of spectral reflectance of remote sensing images. Ten topographic correction methods, such as Teillet regression, VECA, Cosine, Cosine-B, Cosine-C, Cosine-T, C, SCS, SCS+C and Minnaert, were used to conduct topographic correction of ASTER remote sensing images in the complex mountain areas of Qulong, and visual effects, statistical results and spectral changes of ground features were used to quantitatively evaluate the correction results. The results show that the topographic effect in the study area is weakened to different degrees. Teillet-regression correction model has the best correction effect and the topographic effect is weakened to the maximum extent. VECA, cosine-c, and Minnaert calibration models followed. Teillet-regression model can be used as topographic correction model in complex mountain areas.
Oil spill collection boom of ship based on negative pressure principle
Authors: Yi Anning , Zhang Haomin 
Published: March 2020

Abstract
The oil boom has played an important role in the control of ship oil spills, but the oil spill often spreads fast and the control ability of the oil boom is limited. If the oil spill cannot be absorbed and processed in time, the traditional oil boom is difficult to grow. This work designs a new type of oil spill collection fence based on the principle of negative pressure. The main function of this device is to control the area of oil spill area and recover oil spill in time. The device is a unit system and can be folded, which is convenient for the ship to store the device. The device is mainly composed of a water surface oil spill collector, a new type oil boom, a pressure pump and a ship’s fast oil-water separation device. The oil control part relies on the function design of the traditional oil boom to enable timely control of oil spill on the water surface. The oil spill recovery function is realized by the cooperation of a surface oil spill collector based on the principle of negative pressure and a new type of oil fence. Compared with the traditional ship oil spill treatment, the device studied in this project has the characteristics of timely, fast and recoverable oil spill. It can make a significant contribution to maintaining the balance of the marine ecosystem.
Research on assembly accuracy of vertical launcher based on shape error
Authors: Lei Xiaobo , Duan Jinfeng , He Chaoxun 
Published: March 2020

Abstract
As an important part of the shipborne missile weapon system, the overall assembly accuracy of the shipborne vertical launcher will affect the initial accuracy of the test missile launch to varying degrees. Therefore, it is of great significance to research on the assembly accuracy of the launching device. Aiming at the geometric error characteristics of the contact surfaces between the assemblies in the launching device, this paper uses small displacement spins to represent the geometric error of the contact surfaces, and proposes a method for calculating the fit error based on the contact state. The research results show that this method can determine the contact state of the launcher assembly, and the influence of the shape error distribution of the contact surface on the precision assembly cannot be ignored.
Application of comprehensive method in strengthening of a tall building
Authors: Zhu GuoLiang 
Published: March 2020

Abstract
The concrete strength is low, which has a great influence on the compressive bearing capacity, column axial pressure ratio and column reinforcement. In order to solve such problems, it is often strengthened by increasing the section method. However, the use of increasing section method significantly affects the clearance of the building. So, it is strengthened by comprehensive method, in order to not significantly affect the clearance, that is using the outsourcing steel method and the increasing section method simultaneously. This method combines the advantages of the two most commonly methods, the increasing section method and the outsourcing steel method. The bearing capacity of the strengthened member is greatly improved, which not only reduces the influence of the increasing section method on the clearance, but also reduces the area of the externally-formed steel required. Since the adhesive is not required when pasting the steel, the durability of the strengthened member is improved.
Occupational health and occupational hazard control in coal mines: a comparative study
Authors: Deng Xuexiang , Zhang Yuyuan , Cui Liyuan 
Published: March 2020

Abstract
The occupational health efforts within Y Group are examined after analysis on current occupational health and occupational hazard control among coal mines in and outside China, covering a systematic investigation of dust hazard prevention in B Mine and an analytical research of heat hazard in Z Mine. The paper includes an innovative set of studies on the distributions of coal mine workers subject to different occupational hazards and the types of work among pneumoconiosis victims, the distribution of main heat sources underground and measures against heat hazards, as well as the number of dust-exposed workers per ten thousand tons of raw coal. Our findings will provide useful clues for successful occupational health and occupational hazard control in the coal sector.
Using Teaching Learning Based Optimization to Efficacious and Tuning of UPFC-PODs of Interconnected Systems
Authors: Hasan Zinah S. , Hawas Majli Nema 
Published: March 2020

Abstract
This paper offers a systematic procedure for modelling and simulating a teaching-learning-based optimization (TLBO) technique that exercised with styling power system stabilizer (PSS) and UPFC-controller for 6-bus test system. TLBO is used to find an effective and powerful solution for power system stabilizers (PSS) and the power oscillation damping (POD) controller in power systems. The results show the fast damping oscillations and rapidly reaching the steady state with TLBO compared to other methods such as PI-POD and UPFC individually. The parameters of traditional PI are adjusted using try and error method.
Optimal dual design based on capacitor placement and reconfiguration techniques for loss reduction and voltage enhancement
Authors: Kadom H F , Hussain A N , Al-Jubori W K S 
Published: March 2020

Abstract
Distribution System Reconfiguration (DSR) and Optimal Capacitor Placement (OCP) are the most economical and beneficial techniques that have been used in the Radial Distribution Systems (RDSs) to increase the reduction of losses and to perform a better voltage improvement. The DSR technique is a search process to find the shortest path length between the substation and the loads to achieve a maximum reduction in real losses. The OCP technique is used to compensate the reactive power that is required for the inductive loads, which reduces the active and reactive losses and enhances the voltage for the system buses. The approach of combining these techniques provides more improvement than using them individually. In this paper, four cases are implemented that employs either a single or double approach to identify the design with the best performance. The single approach is either DSR or OCP technique as individual technique, while the double approach is either OCP technique for the reconfigured RDS or reconfiguration for the RDS after the application of OCP technique. The optimal selection of tie switches, size and location of capacitors in the individual and dual approaches are achieved by using Qualified Binary Particle Swarm Optimization (QBPSO) and Modified Grey Wolf Optimization (MGWO) algorithms. The four cases are tested for standard IEEE system 33-bus RDS under different loading conditions. The results show the superior performance of the optimal proposed approaches compared to the literature works. Furthermore, the optimal dual techniques have show more effectiveness for loss reduction and voltage enhancement over their individual techniques.