bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison of accuracy and precision of various types of photo-curing printing technology
Authors: Yao Lu , Hu Peixin , Wu Zhangping , Liu Wu , Lv Qitao , Nie Zilin , Zhengdi He
Published: June 2020

Light-cured 3D printing technology has always had a series of advantages such as high precision, fast forming speed and low cost compared with other printing technologies. Since the invention of Stereo lithography Appearance(SLA) printing technology in 1986, light-cured 3D printing has been developing rapidly, and has been derived into Digital Light Processing (DLP), Laser cladding deposition (LCD), Continuous Liquid Interface Production (CLIP), etc. Object: The roughness of the printed products of various photocurable printers was evaluated by the surface morphology of the printed products on the micro level, Compared with the original digital file model, the dimensional accuracy of printed products of various types of photo-curing printers is evaluated. Materials and Methods: A digital 3D model was obtained by scanning the adult maxillary teeth with a 3shape mouth scanner. Save the upper digital three-dimensional model as an STL file and print it as a physical model using three different 3D printers(UNIZ (LCD), Han’s laser SLA 6000 (SLA) and Han’s laser DLP (DLP)). Again, use 3shape to scan the physical model into a 3D digital model and use the Dental Cad to compare the accuracy. Test blocks (20mm*10mm*5mm) were printed using three different printers, and the surface topography was observed using a KEYENCE optical microscope, and data comparison was performed using DANTAL CAD for file fitting. Results and Conclusion: On the Z direction, the surface bump SLA was 185.1 micron mum, the LCD 105.4 mum, and the DLP 95.2 mum. SLA<LCD LCD > SLA. The surface roughness of the test block was DLP>SLA>LCD. Conclusion: DLP performs well in all aspects.
Research Progress in Modeling Methods of Rat Lung Fibrosis
Authors: Zhao Xin , Cao Zhengmin , Wang Ruipeng , Liu Shuang
Published: June 2020

Pulmonary fibrosis affects human respiratory function, and severe cases can lead to progressive loss of lung function. Early intervention and early treatment are important for the prognosis of lung fiber. The establishment of pulmonary fibrosis model is of great significance to study the pathogenesis and pathological process of pulmonary fibrosis. Rats are usually selected to model pulmonary fibrosis in various ways. By retrospectively summing up the rat PF model, progress has been made in the study of pulmonary fibrosis.
Optimization of Al-doped ZnO films by RF magnetron sputtering at room temperature for Cu (In, Ga) Se2 solar cells
Authors: Zhang Xianyang , Zhu Rongyang
Published: June 2020

In this work, Al-doped zinc oxide (AZO) thin films were deposited by RF magnetron sputtering with various RF power at room temperature. The effect of RF power on the structural, electrical, and optical properties of AZO thin films were investigated by XRD, SEM, UV–Vis–NIR spectroscopy and Hall measurements. The lowest resistivity of 1.8×10−3 Ω·cm was obtained at the highest RF power of 450 W. The average optical transmittance is about 90% in the visible range and above 80% in the range of 300-2000 nm. CIGS thin-film solar cells were prepared using the AZO films as the windows layer and an efficiency of 15.36% in CIGS solar cell has been achieved.
How does informed trader trade the “reverse risk”? --OTM Option volume as risk factor for stock prediction
Authors: Guo Jing , Xiao Jie , Ni Zhongxin
Published: June 2020

This article researches the implied risks in the trading volume data of the SSE (Shanghai Security Exchange) 50 ETF options, and explores the power of these risks to predict the return of the underlying stocks. By analyzing the trading behavior of informed option traders, we believe that the trading volume of the OTM (out-of-money) options can capture these traders’ expectations of the “reverse risk”. We divide “reverse risk” into two types of risk information: the first one is the option selection process: the trader decides whether to choose a OTM option or a non-OTM option to hedge their private information, which represents whether they expect the future stock to reverse; the second risk information is measured by the change amount of the current OTM option trading volume, which depicts the new information shock brought by these informed traders’ behavior. The empirical result shows that the option selection process can significantly predict the future returns of the SSE 50 index, while the information shock caused by the change in OTM options trading volume has solid pricing power among individual stocks. We then use Granger causality test to explore the mechanism of risk transmission for the “reverse risk” trading process, and conclude as: the risk information held by informed traders(those who believe the future market will “reverse”) first affected their decision-making process, and their decisions in the options market will transmit the risk to the SSE 50 index trading market, and then cause the current information shocks, and these shocks will eventually affect the constituent stocks of the SSE 50.
A new numerical production well model for the low-permeability gas reservoir
Authors: Yao Yumin , Shi Anfeng , Wang Xiaohong , Wang Min
Published: June 2020

In the development of low permeability gas reservoirs, capillary end effect has a significant impact on the flow near the production well, and physical quantities near the production well all change dramatically, which may reduce the oil and gas production. Traditional well model cannot describe this phenomenon. In this paper, based upon the analytical solution of one dimensional radial flow, an alternative numerical well model for low permeability gas reservoir considering the end effect is constructed. The numerical results show that the gas and water productions can be predicted accurately at different grid scales using the proposed well model. In contrast, the Peaceman well model for multi-phase only can get the accurate results when the grid is enough subdivided.
Study on the Characteristics and Influence Factors of Spontaneous Imbibition in the Fractured Reservoirs
Authors: Li Lu , Wang Min , Wang Xiaohong
Published: June 2020

Spontaneous imbibition is an important mechanism for oil recovery in the natural fractured reservoirs. It’s crucial to study the characteristics and influence factors of the imbibition process. We present analytical solutions for the one-dimensional incompressible imbibition process. Based on analytical solution, we study the effect of some factors on the imbibition process. It is also found in this paper that the larger the viscosity ratio is, the smaller the critical saturation is. A new scaling group is also suggested in this paper to fit experiment data.
Safety analysis of gas pipeline under vehicle load
Authors: Su Chang , Zhu Baikang , Zhu Bin , Yang Xu
Published: June 2020

With the rapid development of the economy, construction has been carried out throughout the country. Natural gas pipe network is widely distributed, so construction vehicles driving on the ground with buried gas pipelines often exert pressure on the pipelines. If the pipelines are not buried deep enough, the pipeline material strength is poor or the construction quality is not qualified, the pipelines may be deformed or even broken when they are under high pressure. In this paper, the influence of excavator and heavy truck load on gas pipeline is analyzed by using finite element software. The results show that the construction vehicle propagates pressure load through the soil, which causes the local concentrated pressure above the pipeline and causes the pipeline deformation. In view of the safety hidden danger caused by the third party construction vehicles, this paper also gives some Suggestions and measures.
Research on Volcanic Reservoir Prediction in Jinlong-2 Well Area
Authors: Kong Chuixian , Xiao Yang , Chen Lichang , Jia Junfei , Zhang Huiyong
Published: June 2020

Volcanic reservoirs have complex distribution that reservoir prediction is often required to provide a basis for development target optimization and horizontal well trajectory optimization. By analyzing the development model and petrographic distribution of volcanic reservoirs in Jinlong-2 well area of Junggar Basin, the lithology, porosity and oil saturation of volcanic rocks are predicted further. Defining favorable reservoir areas provides a basis for development target optimization and horizontal well trajectory optimization.
Knowledge of oil level recovery method based on Measure oil stabilization time
Authors: Xu Yaqin
Published: June 2020

In reservoir dynamic analysis, oil well production volume and level data are important indicators for quantitative evaluation of oil well production status. Under the existing technical conditions, the liquid production volume of oil well can be calculated by using the recovery value of the liquid level after the well is stopped, and its size is the comprehensive reaction of the oil well’s fluid production status. At present, there are 386 annular flow Wells in our mine. All are measured in this way. At present, the main problem is that the oil level recovery method varies greatly, and the daily measurement is different. Therefore, under the current situation that the number of total ore ring Wells increases, the problem of oil quantity accuracy is the key to the formulation of oilfield development plan and dynamic analysis, which must be solved.
Research on Intelligent Management Platform for Energy Enterprises Based on Big Data Technology
Authors: Xiao Gengyi
Published: June 2020

This paper combines a large domestic energy company, takes energy informatics as the theoretical framework, combines the energy consumption status and structural characteristics of the enterprise, analyses the current situation of energy management in the enterprise and the problems in energy management, and uses data from the energy management information system. The exchange and information coupling mechanism connect the various information systems of the enterprise, and optimizes the design of the convection network, sensor body and sensor network to build an enterprise energy informatics model. With the big data idea as the core and the service-oriented technology architecture, the company’s real-time energy is established Data warehouse to integrate energy information of the enterprise, further reduce energy consumption and improve energy efficiency, thereby ensuring that the enterprise minimizes waste in the process of energy use, while reducing operating costs, thereby achieving the goals of energy conservation, emission reduction and environmental protection.
Characteristics and Influence Factors of Es3 Reservoirs in Gubei Sag
Authors: Zhang Yue
Published: June 2020

There are many provenance systems in Gubei sag of Es3. Es3 is one of the main oil-bearing horizon of oil and gas exploration in gubei sag. Because of the great depth, the reservoir property is relatively poor. Influenced by factors such as sedimentary type and diagenesis, the reservoir characteristics of different provenance systems are different. The sedimentary type not only restricts the original physical properties, but also influences the late diagenesis. In the same diagenetic stage, there are differences in the physical properties of different sedimentary types, in the same sedimentary type there are also have many differences between different sedimentary microfiches. The fan delta is the best, and the second is the underwater fan; the best part of the fan delta is the river channel and estuary sand bar in the front of the fan delta. The influence of different provenance system by depth, rock characteristics, the moving distance of different factors, in the stage of diagenesis, diagenetic types and other aspects are different, these factors continue to transform the reservoir. Ultimately these factors lead to the Kendong and Gudao provenance systems have the best reservoirs, Changdi second, Chengdong worst.
Research on the Ore-controlling Factors and Ore-prospecting Indicators of Gaoaobei Tungsten Mines in Rucheng County of Hunan Province
Authors: Tian Junwei , Tian Xufeng , Yan Fugui , Liu Yangsheng , Xiao Lin , Li Wenchao , Cao Zhijun
Published: June 2020

By means of comprehensive analysis, the Gaoaobei tungsten mines in Rucheng County was studied and the results showed that: 1) the ores occurred in veins. The major ore minerals were black-tungsten ores, followed by molybdenite, cassiterite, chalcopyrite, stannite, native bismuth, etc. 2)Distribution of the ore bodies were mainly affected by the formation, the structure and magmatism; 3) There were quite a lot of obvious direct ore-prospecting indicators in the region, mainly including abandoned mining workings, quartz vein, alteration, structural feature.
A New Method for Plane Equilibrium Injection-production Adjustment of Water-drive Reservoir
Authors: Sun Guangyi , Liu Yingxian , Chang Huijiang , Chen Xiaoming , Dong Chi
Published: June 2020

In view of the lack of theoretical research on plane equilibrium injection-production adjustment in water drive reservoir, the production prediction method under the condition of variable pressure difference of production well is deduced according to Buckley Leverett non-piston displacement theory. Taking the same degree of extraction as the goal, the adjustment method of plane equilibrium injection-production per unit time is put forward. The evaluation coefficient of the optimal equilibrium injection-production scheme is defined, which can guide the optimization of the equilibrium injection-production scheme. Through theoretical model analysis, it is considered that the adjustment method of plane equilibrium injection-production is reasonable and reliable. Seven kinds of adjustment schemes are designed for BZ oilfield in Bohai Sea. Of equilibrium displacement time. When the equilibrium displacement time is more than 10 years, the increment of recovery degree slows down to about 1.8%. Equilibrium injection-production adjustment was carried out for 1195 sand body in BZ oilfield. The sand body increased oil by 25m3/d per day, and the natural decline rate decreased by 1.1%.
A Research on Volatility Spillover Effect between Real Estate Industry Index and other Related Industries Based on MGARCH-BEKK/DCC Model
Authors: Xiao Jie , Ni Zhongxin
Published: June 2020

We use the MGARCH-BEKK / DCC model to study the volatility spillover effects and dynamic correlations between industry indexes. We selected indexes for four industries: real estate, raw materials, manufacturing, and banking. The research results show that the real estate industry will be greatly affected by the manufacturing industry, raw materials industry, and banks, and there are two-way fluctuation spillover effects between them. The raw material industry is mainly affected by the manufacturing industry, and it is also affected by real estate and banks, but the impact is relatively small. Banks have influence on the other three industries, especially on the real estate and manufacturing industries. Manufacturing mainly affects the real estate and raw materials industries, but it has less impact on banks. In addition, the DCC coefficient between stock indexes is positive for most of the time period. The dynamic correlation between the real estate index and ICBC stocks, and the dynamic correlation between the raw material index and ICBC stocks have significant asymmetry, and to some extent, their fluctuation characteristics are similar.
Urban Rail Transit Energy Storage Based on Regenerative Braking Energy Utilization
Authors: Zhang Jiao , Li Yujie , Xie Hao , Li Bin
Published: June 2020

In order to better realize the energy-saving operation of urban rail transit trains, considering the use of regenerative braking energy has become the focus of current academic research. Train operation chart optimization, energy storage system recovery, and inverter system feedback are the main technical means for its implementation. At present, the recovery of energy storage systems includes super capacitor type, battery type, and flywheel type energy storage devices. This paper focuses on the urban rail transit energy storage recycling method based on the utilization of regenerative braking energy, studies the basic working principle of the energy storage recovery device, and analyzes the different energy storage and recovery devices, and draws conclusions through comparison.
Stability of the Cone Probe Driven by Hydraulic Motor Based on Fuzzy PID
Authors: Liu Hengyu , Liu Yanjun , Xue Gang , Chen Zhi , Zhang Yingying
Published: June 2020

In the test of mechanical properties of deep-sea sediments, hydraulic cylinders are often used to drive the probe into the sediment. However, due to the limitation of the stroke of the hydraulic cylinder, there is a limit to the depth of penetration of the probe. In order to solve the problem of limited travel, a penetration device that relies on hydraulic motor to drive the probe is designed. Through the co-simulation of AMESim and Simulink, the valve-controlled hydraulic motor system is analysed under the control of conventional PID control strategy and fuzzy PID control strategy. Simulation results: In terms of step response, the fuzzy PID control is 7.12% faster than the traditional PID control, and the overshoot is reduced by 44.4%. Under the step interference signal, the fuzzy PID control has an anti-interference ability improved by 60.7%compared with the traditional PID control. In terms of energy consumption, fuzzy PID control saves 1.08% energy compared to traditional PID control.
Research on Modal Analysis of Rotor Shaft System of Hydro-generator
Authors: Niu Litao , Sun Qi , Ma Chenyuan , Liao Junlin , Pu Jianguo
Published: June 2020

In this paper, the influence degree of eccentricity distance and guide bearing stiffness change on the vibration characteristics of the unit under the condition of rotor mass misalignment is discussed respectively, and the modal characteristics of the unit are studied for the problem of generator mass eccentricity. First of all, the guide bearing is parameterized, the whole axle system modeling is calculated by FEM modal analysis method, the results of the analysis obtain the first 10th order critical frequency and vibration mode analysis results, further determine the danger point of displacement deformation concentration. Comparing the vibration type, critical frequency and center vibration trajectory of the guide bearing under different constraint conditions, the characteristics of the unit vibration caused by the rotor quality is: the axis tile gap is gradually enlarged due to the eccentric rotation of the rotor of the unit, and the vibration characteristics of the main frequency in the unit vibration signal are unchanged. The results are confirmed by field inspection data.
A Literature Review of Corporate Social Irresponsibility (CSIR)
Authors: Zhang Hua , Zhang Huaxi
Published: June 2020

Modern society has paid more and more attention to whether companies take social responsibility, but corporate social irresponsibility (CSIR) is still an emerging area in academia. Summaries and reviews on existed research results are conducive to finding theoretical gaps and clarifying future directions. Built on reviews of domestic and overseas researches on CSIR, this paper summarizes the concepts and classifications of CSIR first. Then, the causes of CSIR and the direct and indirect consequences of exposure of CSIR are analyzed from three levels including the individual, the organization, and the external environment. Finally, this paper provides prospects for future research.
Research on Sedimentary Facies and Sedimentary System of Permo-Carboniferous Strata in Xin’an Coal Field
Authors: Yao Chunhui
Published: June 2020

In this paper, through rock core, logging curve, plane shape, distribution and other characteristics in the research area, combined with regional data, the Permo-Carboniferous Strata in the research area experienced tidal flat sedimentary system, delta sedimentary system and river sedimentary system, flood-overlake sedimentary system from bottom to top, it is proved that basin filling evolution of the epicontinental sea basin from occurrence, development to extinction.
Effect of Injection Parameters on Vibration of High Pressure Common Rail Diesel Engine for Light Vehicle at Idle Speed
Authors: Zhou Jing , Zhou Liying , Luo Fuqiang , Zhou Zhifeng
Published: June 2020

With the progress of science and technology and the improvement of people’s living standards, the comprehensive performance requirements of automobiles are also increasing. Reducing engine’s vibration and noise is one of the important research contents in the field of automobile research. An experimental study was performed to investigate the effect of injection parameters on engine’s vibration at idle speed by using a four-cylinder high pressure common rail diesel engine. On the premise of not changing the components, the influence of each parameter on the vibration is compared and analyzed by changing the parameters such as main injection timing, interval of pilot-main injection, pilot injection quantity and rail pressure. The test results show that the vibration of diesel engine can be reduced by delaying the main injection timing properly, and the optimal interval of pilot-main injection is related to the main injection moment and the quantity of fuel injection. The determination of the pilot injection quantity must be determined by the pilot-main injection moment and the cycle injection quantity together in order to achieve vibration reduction. The increase of rail pressure will increase the vibration of the whole machine. Thus, the proper injection strategy is conducive to improve engine vibration characteristics.
Research on Physical Education Training in Colleges and Universities Combined with Local Resources and Environmental Characteristics
Authors: Guan Xiangwei
Published: June 2020

Physical education teaching environment is a synthesis of various objective conditions necessary for physical education teaching activities in schools except for physical education teachers and students. Physical education teaching environment is an important factor in physical education teaching activities. Similarly, physical education teaching is also an important topic in the theoretical research of modern physical education. At present, although most schools and PE teachers in our country are more or less using environmental resources for PE teaching activities in schools, there is still a lack of systematic and standardized teaching materials for PE teaching activities in schools using environmental resources for related projects. How to correctly understand the physical education teaching environment, make the physical education teaching environment better adapt to the physical education teaching and serve the physical education teaching, has become a subject that must be studied in the physical education teaching activities. This paper puts forward the teaching method of physical education in Colleges and universities combining with the characteristics of local resources and environment, and analyzes and studies its implementation ideas.
Discussion on the Method of Measuring Sand Content
Authors: Li Xia , Xie Siqin , Jin Xin
Published: June 2020

The determination of sand content is related to the accuracy of soil and water loss measurement. With the development of science and technology, there are many advanced sediment content measurement technologies. However, due to the differences and complexity of soil conditions in various regions, The applicability of this method for sand content measurement needs to be verified. This article explores the method for measuring sand content in red soil on the conditions of simulated rainfall and runoff experiments, and verifies the measurement accuracy of water samples with different sediment contents using the gravimetric method. The results show that when the sediment content is small, the error of the specific gravity method is large, and its accuracy increases with the increase of the sediment content, and the accuracy is the highest when the sediment content is about 40g/L. In addition, the fitting curve is used in this paper. The sediment content is measured and compared with the drying method. The experimental results show that the measurement accuracy is higher than the specific gravity method, but the results are different from the drying method.
Finite Element Analysis of Thermal Stress of GIS Shell in Sunlight Environment
Authors: Wang Xinxin , He Cheng , Zhao Puzhi , Zheng Yi , Jiang Shihao , Wei Yanding
Published: June 2020

In order to study the thermal stress of the GIS shell under normal internal pressure in the sunshine environment, First, the 24-hour temperature field on the surface of the GIS shell of a substation is detected for and the temperature change curve is plotted. Then the ANSYS software is used to carry out finite element stress analysis including temperature field on GIS shell. During the analysis, select the highest temperature and lowest temperature periods, fit the temperature distribution curve of the cross section of the shell varying with the angle under the two conditions, and apply the corresponding temperature load of the two conditions to obtain the stress distribution and stress amplitude distribution. The results show that under normal sunlight environment, the stress of the shell without stress concentration is less than 30Mpa, and the stress variation value caused by diurnal temperature difference in most areas of the shell is within 5MPa, and it can reach about 10Mpa at the top where the stress concentration occurs. This study analyzes the stress distribution and fluctuation range of the GIS shell under the solar radiation, which provides important data support for the safety evaluation of the GIS shell.
Enhanced Charge Transportation towards High Luminescent 2D Perovskite Light-Emitting Diodes
Authors: Wu Yongwei , Yang Guang , Xin Zhilong , Jiang Pei , He Bo , Yin Yongming , Duan Miao , Li Dongze , Chen Shujhih , Zhou Hang , Lee Chia-yu , Zhang Shengdong
Published: June 2020

In this work, PEDOT: PSS 1000 was used as hole transporting layer to fabricate high luminescent perovskite light-emitting diodes. Combined with potassium doping strategy, the according perovskite light-emitting diode reaches a high brightness of 40 000 cd/m2.
Correlation Study on Economy Growth and Petroleum Consumption-Taking US, China and Japan as examples
Authors: Ye Zhanghuang , Deng Chenxia
Published: June 2020

Petroleum is the world’s most important primary energy. The global petroleum market fluctuation will threaten China’s energy security. China’s petroleum foreign dependency reached 67.4% in 2017. General speaking, quick petroleum price rising and high dependence on foreign petroleum are likely to have an adverse impact on the economy. However we will seek the truth by using data. The paper has analyzed the correlation between GDP growth of 3 countries (US, China and Japan) and 2 independent variables (international petroleum price rising and dependence on foreign petroleum) by using the econometric model. As for US, international petroleum price rising has no remarkable effect on GDP growth. The dependence on foreign petroleum is positively correlated with GDP growth: 0.14249. As for China, both international petroleum price rising and dependence on foreign petroleum have a negative correlation with the GDP growth: -0.02669 and -0.24123 respectively. As for Japan, both international petroleum price rising and dependence on foreign petroleum have no significant impact on its GDP growth. The conclusion illustrates that US and Japan have been well rewarded from their reasonable investment and exploration on the overseas petroleum resources.
Research on Cutting Path Optimization of Trimming Process
Authors: Liu Yingnan , Fu Wenzhi , Li Mingzhe , Lin Lin
Published: June 2020

For a stamped part, excess material on the edge need to be cut to get the final part. To explore the impact of different laser-cutting paths on the accuracy of part formed by multi-point forming with blank-holder, three different cutting paths are designed in this paper, and the process of laser-cutting is simulated by finite element method. By comparing the springback of the parts under different cutting paths, it is found that the part cut by path 3 has the highest accuracy. Finally, the experiment is performed with path 3 and compare the shape of the formed part with the target part, it is verified that cutting with path 3 can obtain higher precision parts.
Research on Reliability of Mechanical Structure Testing for Hybrid New Energy Vehicle Parts
Authors: Li Taotao
Published: June 2020

With the development of new energy in China and the development of the automotive industry, the exhaust emissions of automobiles have caused serious environmental protection issues. The development of new energy requires energy conservation and emission reduction. The development of the automotive industry is contrary to the concept of new energy development and cannot be achieved. The new energy industry and the automotive industry develop together. Therefore, the country needs to complete the reform of automobile maintenance and testing technology in the new energy era to achieve energy conservation and emission reduction, promote the development of China’s automobile industry, and better solve the environmental problems in China. This article takes pure electric vehicles and plug-in hybrid vehicles as research objects, divides the diagnosis objects into three parts: mechanical structure, electronic control system and high-voltage equipment, and combines traditional automotive parts detection technology to propose new energy vehicle detection technology methods. Help maintenance personnel better grasp the diagnostic technology of new energy vehicles.
Analysis of tube bending deformation in petrochemical heater furnace tubes
Authors: Ye Yufeng , Chen Xingyang , Xie Haoping , Liu Huibin
Published: June 2020

Serious bending deformation of the tubes was found in the tubular furnace at a petrochemical company. In order to find out its specific reason, Thickness measurement and metallographic analysis were conducted on the problematic part of the furnace tube. Stress analysis by using CAESAR was carried out, in which the working conditions were considered. The results show that the microstructure of the furnace tubes was not abnormal, and there is no overheating, creeping and deterioration damage was existed during operation. Stress analysis show that the primary and secondary stress values of each node were less than the allowable stress for furnace tubes under current condition. However, the secondary stress will exceed the allowable stress when the furnace tube is bended up to 400 mm. Therefore, in order to avoid the replacement of furnace tube and the unnecessary economic loss, the tubes could be used safely under closely monitored after structural rectification.
Research on Function Optimization Based on Improved Genetic Particle Swarm Optimization
Authors: Zhang Hai , Li Shixin , Liu Xiaoyu
Published: June 2020

Aiming at the shortcomings of single algorithm such as blind operation, directionless, long calculation time, low accuracy in Genetic Algorithm and poor diversity of population of Particle Swarm Optimization, which is prone to premature and fall into local optimum. In this study, the serial algorithm fusion idea is adopted, and the population evolved from the Genetic Algorithm is taken as the initial population to be executed by the Particle Swarm Algorithm, namely GAPSO algorithm. In view of the drawbacks of the respective algorithms in the execution of GAPSO algorithm, this paper proposes an Improved Genetic Particle Swarm Optimization algorithm, namely IGAPSO algorithm. In this algorithm, the improved GA only optimizes the initial particle once and then gives it to the improved PSO for optimization. Its optimization method and ability are greatly improved, resulting in a rapid increase in convergence speed. In addition, the improved PSO introduces adaptive inertia weight and learning factor, so that the particles can adaptively adjust global search and local search, and adaptively balance the influence of self-experience and social experience, which greatly avoids falling into local optimization problem and makes the solution more accurate. Through the verification of test functions, GAPSO has obviously improved the calculation accuracy, convergence speed and global stability compared with a single algorithm, while IGAPSO has also improved the convergence accuracy and speed compared with GAPSO, especially in multi-peak functions.
Research on Casualty Characteristics of Fish in Tubular Turbine based on IB-LBM method
Authors: Zhu Guojun , Li Jiang , Feng Jianjun
Published: June 2020

The IB-LBM numerical method particularly effective at simulating the motion dynamics of individual or more fish in the turbine. Based on this method, the pressure and pressure gradient damage of the fish passing through the tubular turbine are analyzed. From the results, it can be found that the low pressure and excessive pressure gradient in the runner can result in irreversible damage on the swimming bladder and eyes of the fish. So the runner is the main component induces fish casualty, and its minimum pressure and pressure gradient need to be limited in the design process.
Study on Numerical Simulation of Roadway Backfill under Freeway Based on FLAC3D
Authors: Dong Yu , Shao Leichang , Shi Junwei
Published: June 2020

Based on the paste-like roadway backfill technology in the study of coal mining under the freeway in Tang’an Mine, the mining scheme of coal under the freeway is described. In order to grasp the change law of the stress and damage degree of coal pillars and surrounding rocks during the coal mining process of roadway backfill, analyze the stability of coal pillars and the amount of roof subsidence, using FLAC3D numerical simulation method, select the width of coal pillar elastic plastic zone, the vertical stress of the column and the vertical displacement of the roof are used as indicators. The influence of the 15m temporary coal pillar width on the stability of the coal pillar, the stress distribution of the surrounding rock and the sinking of the roof under the mining method are studied to verify the feasibility of the mining scheme.
Research on Internal Tax Control of New Energy Saving and Environmental Protection Wind Power Generation Energy Enterprises
Authors: Jia Xinyu , Fu Yijie , Sun Haoran
Published: June 2020

With the increasingly severe energy situation, the exhaustion of traditional energy and the increasingly serious environmental pollution, it is of great economic and social significance to vigorously develop renewable clean energy of wind power. After the introduction of a large number of preferential tax policies to support the development of wind power in China, wind power has made great progress, effectively promoting the optimization of energy structure and production layout in China. As an effective measure to reduce the tax burden of taxpayers, the practice of tax internal control has achieved good effect and great potential application value. Reasonable tax planning of wind power generation enterprises is conducive to reducing tax costs, standardized and scientific tax management of enterprises and maximization of financial benefits. In order to facilitate wind power enterprises to understand and make good use of preferential tax policies for wind power, this paper makes an in-depth analysis of the problems existing in the internal tax control of new energy-saving and environment-friendly wind power generation energy enterprises in China, and puts forward effective solutions to specific problems.
Energy Consumption Investigation and Energy Saving Potential Analysis of an Office Building in Xiamen
Authors: Mu Yanjuan , Wu Haodong , Wang Jianfei
Published: June 2020

An analysis of the energy consumption data of an office building in Xiamen in the past three years compared with both a year and a month earlier. At the same time, the corresponding energy consumption indexes of various types of energy consumption systems are calculated. The analysis results show that the air conditioning system and lighting system are the two largest energy consumption systems in the office building. Office building energy conservation should be prioritized in-depth excavation and analysis from these two systems to find the best energy-saving retrofit solution.
Technical Analysis of Airtightness of Low-Rise Steel Structure Assembled Ultra-Low-Energy Building
Authors: Hao Yuhang , Shi Yuanyuan , Bian Zhihui , Li Shangfei , Yan Runqiu
Published: June 2020

Fabricated steel structure ultra-low-energy building is a new type of building, which is the integration of many new technologies. The air-tightness treatment of low-rise fabricated steel structure ultra-low-energy buildings is one of the key technologies for buildings to achieve ultra-low energy consumption. Through technical analysis of each airtight weak part, the technical measures adopted by the nodes are determined, which provides a reference basis for the popularization and application of low-rise fabricated steel structure ultra-low-energy buildings.
Analysis of Relay Protection in Power System Based on High Voltage
Authors: Sun Jiaqi
Published: June 2020

In recent years, China’s economic development level has continuously improved, great achievements have been made in the construction of electric power, the size of the power grid has also been continuously expanded, and higher requirements have been placed on the safety and stability of power systems. Power system protection occupies an important position. The essential. In the context of today’s high-voltage direct current transmission, line construction has gradually increased, and with it came defects in relay protection technology, which have seriously affected the further development of the power system. This article will specifically analyze the strengthening of relay protection technology in HVDC transmission lines, and improve the power system safety level by improving the performance of relay protection devices.
Analysis of hybrid wind-photovoltaic-hydro generation system based on short-term scheduling
Authors: Li Tenghui , Huang Zhe , She Shida
Published: June 2020

Renewable energy sources are beneficial to provide clean power generation but simultaneously brings power supply risk due to natural uncertainties. A hybrid wind-solar-hydro generation system, which takes advantage of the complementary characteristic of renewable energy sources, is capable to supply the power demand reliably. A multi-objective model of the hybrid system is proposed to achieve minimum power supply risk and maximum economic benefit under natural limitations. To handle natural uncertainties, autoregressive integrated moving average model is applied to produce typical daily models of weather conditions in different scenarios. Meanwhile, particle swarm optimization algorithm is improved to solve the multi-objective model by introducing the ϵ-constraint method. Lastly, an example of a large-scale hybrid wind-photovoltaic-hydro system is given to analyse reliability, profit, efficiency and operation in different scenarios. The study has shown that the hybrid system does not crash reliability but increases economic benefit, it’s necessary to reserve wind and solar generation, wind generation needs to cooperate with hydro generation according to water dispatching.
Study of Cluster Test of Complex Circuits
Authors: Li Zhiwei , Pan Zhongliang
Published: June 2020

Cluster test of complex circuits is very difficult. The paper uses boundary scan test technology, different test algorithm, and test method for performing output operations on the boundary scanning units at each end of the interconnect network, and does a lot of test and analysis, effectively solves the problems of cluster test of complex circuits, and gives high fault resolution.
Research on Technology Development of High-rise Buildings Based on Modern Green Environmental Protection Theory
Authors: Lu Zhengyan
Published: June 2020

With the continuous development of construction technology in China’s super-tall buildings, the construction of super-tall buildings has gradually expanded from first-tier cities to second-tier and third-tier cities. In order to create green super high-rise buildings, in addition to the rational use of key technologies in design and operation, it is also necessary to correctly grasp the current standard regulations for green buildings and green construction. According to relevant requirements and evaluation standards, correspondingly propose green the main points of construction technology, and at the same time put forward ideas for the application of clean and renewable energy in the construction process according to the current national conditions.
Hybrid CTC/Attention Architecture with Self-Attention and Convolution Hybrid Encoder for Speech Recognition
Authors: Nie Mingxin , Lei Zhichao
Published: June 2020

The success of self-attention in NLP has led to recent applications in end-to-end encoder-decoder architectures for speech recognition. The transformer model based on self-attention get a promising result. As you can see, the hybrid model based on Connectionist Temporal Classification (CTC)/Attention has very prominent advantages in decoding, which can combine the excellent sequence-to-sequence modeling ability of attention, and can also combine CTC to achieve temporal alignment. We propose SA-Conv-CTC/Attention model, which apply a Self-Attention and shallow Convolution based hybrid encoder to Hybrid CTC/Attention Architecture, and we also explored the method of decoding with Self-Attention language models. The CTC network sits on top of the encoder and is jointly trained with the attention-based decoder, even participated in decoding. We achieve a 0.8-4.75% error reduction compared to other hybrid CTC/Attention systems on WSJ and HKUST dataset.
The Impact of Tax Burden on Enterprises’ Innovation Input——An Empirical Analysis Based on Tax Avoidance Incentives
Authors: Liu Shuqin
Published: June 2020

This paper studies the impact of corporate tax burden on the next level of innovation input. Taking the listed companies in China’s GEM from 2009 to 2017 as the research object, this paper finds that the tax burden of enterprises has an incentive effect on the next innovation input level. Further research finds that, compared with state-owned enterprises, the tax burden of non-state-owned enterprises has a stronger incentive effect on the next innovation input level.
Research on Energy Internet Power Line Communication Technology Based on Block Chain
Authors: Hu Mengjin , Li Jiaheng , Wei Mengju , Liu Xuefei , Liu Zhao , Yang Yang
Published: June 2020

With the continuous development of energy Internet technology, its requirements for communication systems are getting higher and higher. As for the energy Internet, it is based on the concept of the Internet and the existing smart grid. Its communication system also needs to rely on the existing power communication system. In the energy Internet, the use of block chain and intelligent contract technology to meet credible and automatic point-to-point energy transactions can improve the overall operating efficiency of the system, reduce management costs, and make the energy Internet a self-organizing and self-regulating structure. In essence, energy Internet and block chain technology must be built on the Internet of Things, a common intelligent device. This paper takes the power line communication technology of the Internet in the current power system as the research object, analyzes the main challenges and problems in the construction of energy Internet based on blockchain, and then provides the corresponding research basis for the future heterogeneous network integration.
Comparative Study of Electromagnetic Performance of Double-tooth Variable Flux Memory Machine
Authors: Zhang Chenguang , Liu Xu
Published: June 2020

Aiming at the problem of the low electromagnetic torque performance of the traditional Variable Flux Memory Machine (VFMM), a novel double-tooth Variable Flux Memory Machine is proposed in this paper. Firstly, the topology and operation principle of the novel double-tooth VFMM are introduced. By using the 2-D finite element analysis method, the open circuit characteristics of the novel double-tooth VFMM and the traditional single-tooth VFMM with low coercive force (LCF) in different magnetization states are compared and analysed, and the electromagnetic torque in the flux-enhanced state is compared and studied. In addition, the efficiency maps of double-tooth VFMM are investigated. Compared with the traditional single-tooth VFMM, the flux adjustment ability of the double-tooth VFMM is more than doubled, and the electromagnetic torque under the same current is increased by 21.8%. The results show that the double-tooth VFMM has better flux adjustment ability and larger electromagnetic torque.
A target threat assessment method for low-altitude aircraft
Authors: Nie Xiaoqian , Yan Peng , Wang Bingqi , Wu Binbin , Gao Chengshuai
Published: June 2020

In recent years, with the gradual opening up of chinese low-altitude airspace, and the government active support for the development of the general aviation and drone industries, the traditional physical protection is mainly aimed at ground threats, resulting in the threat and harassment from air targets has become increasingly prominent. In order to effectively and effectively deal with low-altitude small aircraft in a timely and effective manner, the target threat assessment has become an important part of the command and control process. The target threat degree is the threat degree of the aircraft to the air defense early warning and surveillance system, and is an important basis for handling the detection targets in the safety prevention and control work. The purpose of the threat assessment is to conduct a comprehensive evaluation based on the qualitative and quantitative analysis of the target on the basis of the target identification, and rank the threat levels for all the targets to prepare for the next step.
Research on Key Technologies and Innovative Development of Electronic Communication System Based on Serial Communication
Authors: La Xiang
Published: June 2020

Today, with the rapid development of computer technology, communication between computer and modern energy instrument Xinxing is extremely important. Serial communication is widely used in on-line monitoring of process quantity in industrial enterprises. This paper analyzes the characteristics of this serial communication, and expounds the selection of communication mode for computer business, the connection of interface hardware and the programming of software. Ethernet technology is currently widely used in the industrial field. Because computer serial communication has shortcomings such as short communication distances and low transmission speeds, meanwhile, process quantity signals have many types, large differences in value ranges, and continuous changes. The key technical issues such as long-distance transmission of travelling signals, real-time communication and display of process volume change curves must be properly resolved before a practical online monitoring system can be constructed. Or it has important reference value for personnel engaged in serial communication between computers and Ganneng instruments.