bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Analysis of Fixture for Welding Casing Components of Cross-Flow Turbine
Authors: Muchtar M , Rasyid S , Sonda L
Published: December 2019

The purpose of this research is to improve the quality of the turbine casing product by using the welding fixture. The method used was to design and make welding fixture of turbine casing welding, test the straightness, alignment, straightness, and analyzes the deviation of measurement results. Based on the design result of welding fixture assembling of cross-flow turbine casing component, it had been obtained prototype welding fixture which can facilitate the assembling process of cross-flow turbine casing component. The conclusions of this research are the quality of cross-flow turbine casing products can be increased along with the small geometry deviations in the cross-flow turbine runners by using a fastening tool. The maximum deviation of the straightness of the turbine wall is 1.6 (wall A) and 0.85 (wall B). The process of assembling the components of the turbine runner is shorter by using a faster welding assembly tool with a better level of accuracy.
Analysis on Environmental Problems and Countermeasures In The Process of Steel Material Manufacturing
Authors: Guo Yixin , Xiong Jifeng
Published: December 2019

Since the reform and opening up, China’s industrialization has advanced rapidly, the overall level of industry has improved markedly, and its comprehensive national strength has been further enhanced. Among the more than 500 major industrial products, the output of many kinds of products ranks first in the world, and China has become a veritable industrial power. But behind this, many environmental problems in the manufacturing process of steel materials have had serious consequences for the ecological environment in which we live and develop, and have had many impacts on our quality of life and physical health. This paper focuses on the causes of environmental pollution problems in the steel industry, and proposes solutions to these problems, providing reference for the sustainable and healthy development of the steel industry.
Emergy Evaluation of Green Concrete Production Efficiency
Authors: Zhao Yu , Miao Yu , Li Lihong , Lu Xu
Published: December 2019

By comparing the traditional concrete production mode with green concrete production mode, including recycled aggregate concrete production mode and fly ash concrete production mode, the system emergy flow of each production mode is analyzed, and the emergy analysis method for each mode is put forward.
Inspection and evaluation strategy for uncoated weathering steel bridges
Authors: Wu Junyin , Yang Dahai , Su Qiang
Published: December 2019

Uncoated weathering steel can significantly reduce the life cycle cost of bridges and the difficulty of maintenance during operation. However, weathering steel is not a maintenance-free material. Design and construction errors, topography, de-icing salt and other factors are likely to cause severe corrosion of weathering steel. Therefore, effective inspection and maintenance planning is essential to ensure that weathering steel bridges can reach expected service life. Weathering steel bridges must be regularly inspected to check the corrosion of weathering steel in important parts, and evaluations shall be made to develop maintenance plans. Previous investigations show that the appearance of weathering steel’s rust layer can effectively judge its stability. Therefore, the corrosion condition of weathering steel can be judged by different rating of the appearance of the rust layer. Meanwhile, corresponding maintenance measures will be formulated.
Ultrasonic assisted solvothermal synthesis of CaCO3-Ni-MOF and its application in removing heavy metal ions
Authors: Yang Jie , Qin Guangchao , Li Qihong , Huang Huabin , Wu Yun , Zuo Xiuxiu
Published: December 2019

The effect of CaCO3-Ni-MOF synthesized by different ratio between Ni2+ and organic ligand terephthalic acid on the removal of heavy metal ions was studied. CaCO3-Ni-MOF was synthesized by ultrasonic and solvothermal methods. The crystal structure and morphology of the material were characterized by XRD and SEM. TG curve was used to test the thermal stability of the material. In addition, the experimental study also found that CaCO3-Ni-MOF can remove heavy metal ions. The adsorption capacity of Cu2+ was found to be 16.96mg/100mg by energy spectrum analysis. And the amount of lead also has a certain amount of adsorption. The results show that the performance of the CaCO3-Ni-MOF material in the water environment has not been destroyed, and the heavy metal ions in the water can be effectively separated.
Environmental Quality Optimization and Fiscal Decentralization: an Expanded Endogenous Growth Model
Authors: Zhou Lan , Lu Yang
Published: December 2019

The research focuses on China’s environmental quality and economic system. Using the endogenous growth model and Davoodi & Zou model, a four-sector endogenous growth model with variables of ecological environment and fiscal decentralization is constructed and the static and dynamic panel models are further constructed. The conclusions are as follows: ①Fiscal decentralization and tax burden have non-linear effects on environmental quality;②Fiscal decentralization and tax burden have a deteriorating effect on environmental quality while the synergy of the two produces a dilution effect that weakens each other; ③Environmental quality itself has lagged effect. Therefore, it is proposed to coordinate and consist the fiscal decentralization and tax system and cultivate innovation capabilities, reduce unit energy consumption.
Application of material testing technique in Highway Engineering
Authors: Zheng Fuchun
Published: December 2019

The various factors that affect the quality, cost and progress of highway engineering, a common point have been found-- material quality have plays a decisive role. Material testing technology is the key technology to ensure the quality of materials. In recent years, it has been paid great attention to in many fields of construction engineering. The significance and application of material testing technology are briefly analyzed. It was found that the material testing technology has strong practical value in the application of highway engineering, which not only influences the quality, cost and progress of highway engineering, but also accelerates the popularization of new construction technology and construction materials.
Comparative Study on Multi-type Domes of Filament-Wound Composite Pressure Vessels
Authors: Cai Qiang , Pu Xiaohang , Dan Linpeng , Li Xintian
Published: December 2019

Filament-wound Composite Pressure Vessels (FCPV) have been used widely in the aerospace and commercial industries. Multi-type FCPVs have been applied to different mission scenes. In this paper, four types of domes (helical winding, helical winding ellipsoid, polar winding, polar winding ellipsoid) are studied based on a simplified parametric model, and a modified meridian computing method is employed for polar and helical winding domes after the inflection points. At last, four FCPV cases of different type of domes are calculated and discussed in detail. Results indicate that the parameters of the same winding pattern dome are similar, so it is suggested to use ellipsoid domes in prior for the convenience of fabrication and avoiding the inflection point at the meridian.
A Sandwich Coating Containing Micro-perforated Panel for Underwater Sound Absorption
Authors: Li Lin , Zhang Zhifu , Xu Zhichao , Huang Qibai
Published: December 2019

This paper focuses on the underwater application of Micro-perforated panel (MPP) for broadband sound absorption. In this paper, MPP-rubber coating (MPPRC), a novel sandwich anechoic coating embedded with MPP in high-viscosity condition, is proposed. The acoustic impedance for MPP is derived from Maa’s equation and vibration modal modification, while the acoustic propagation property of the viscoelastic rubber layer is obtained by the wave propagation equation. The theoretical calculation for the absorbency of the composite structure is conduced based on electro-acoustic analogy method and transfer matrix approach. The sound absorption validation is carried on in a hydroacoustic impedance tube filled with water, and the experimental results match with the theoretical model. Compared with the equal-thickness rubber, the MPPRC performances better at a lower frequency of 1.6 kHz ∼15 kHz due to MPP, which shows the potential to be utilized as an underwater anechoic coating.
A Submersible in-Situ Highly Sensitive Chlorophyll Fluorescence Detection System
Authors: Pan Yi , Qiu Lei
Published: December 2019

Chlorophyll concentration in water is an important indicator of water quality monitoring. In this paper, the method of fluorescence analysis for the detection of chlorophyll in water is introduced in detail, and a design scheme of in-situ chlorophyll fluorescence detection instrument is proposed. Effectively improve the efficiency and accuracy of chlorophyll fluorescence detection in water by optimizing optical path, fluorescence signal modulation, filtering and other anti-interference methods; Adopt a low-power design scheme to extend the instrument’s in-situ continuous detection time. The test results show that the linear response correlation coefficient R of the self-designed water chlorophyll detection instrument is above 0.999 with an accuracy of 0.02μg/L. The in-situ measurement time can reach 3 months, reaching the level of similar high-end instruments abroad.
Corrosion behavior of plasma transferred arc and laser cladding Ni-based alloy coatings in different acid solutions
Authors: Cheng Qian , Chen Haiyan , Hou Yue , Fan Li , Dong Lihua
Published: December 2019

The Ni-based coatings were prepared by laser cladding (LC) and plasma transferred arc (PTA) welding, respectively. The corrosion behavior of the coatings were tested by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical corrosion, long-term immersion tests and X-ray photo electron spectroscopy (XPS) analysis. The results of XRD showed that the composite coatings comprised Ni, Cr and Mo. The electrochemical corrosion tests included polarization curves and electrochemical impendance spectroscopy (EIS). The XPS analysis presented samples included Ni, Fe, Cr and Mo oxides, which protected the substrate from corrosion by acid solutions. The results also presented that the Ni-based PTA coating is more resistant to corrosion than the Ni-based LC coating. In the immersion tests, the coatings changed from pitting to general corrosion as the immersion time prolonged.
Synthesis of Ethyl 4-(4-Nitrophenoxy) Picolinate
Authors: Xiong Hehua , Gao Yanli , Yang Qi , Tang Qidong , Zheng Pengwu
Published: December 2019

Ethyl 4-(4-nitrophenoxy) picolinate 4 is an important intermediate for the synthesis of many biologically active compounds. The compound ethyl 4-(4-nitrophenoxy) picolinate was obtained by three simple steps to synthesis from 2-picoliniacid. In this paper, three novel chloropicolinoyl chloride derivatives were prepared. The structure was confirmed by MS and 1H NMR. Furthermore, the synthetic method was optimized. The total yield of the target product was 78.57%.
Study on Microwave Sintering Process and Surface Texture Characteristics of Ceramic Materials
Authors: Xu Zhihua
Published: December 2019

The sintering process and properties of nano-cermet materials were studied by microwave sintering new technology. The results show that the microwave sintered Al2O3-TiC-Mo-Ni nano-ceramics can reach a relative density of 99.0% when kept at 1500 °C for 10 min; the sintering temperature is lowered, the sintering time is greatly shortened, and the grains are sintered before and after sintering. The diameters are 35 and 55 nm, respectively, with little change. At the same time, the paper discusses the surface texture formation and aesthetic characteristics of ceramic materials after sintering. The paper hopes to contribute to the art ceramics firing and decoration field.
Research on the aging characteristics for different FRP composite material before and after 5000h multi-factor aging
Authors: Feng Bing , Wu Xiong , Li Panfeng , Xie Fang
Published: December 2019

In order to reveal the the aging characteristics for different FRP composite material before and after 5000h multi-factor aging, different resin-based/glass fiber composites are prepared, and the effects of various factors such as mechanical strength, microscopic interface and thermal stability on the aging resistance of composites are discussed. The results shows that the flexural strength retention rates of the composite samples are above 90% after 5000h multi-factor aging, and the aging resistance is good and meets the project requirements, SEM scanning displays that there is no obvious cracks on the interface between the glass fibers and the resin matrix after multi-factor aging test, and the interface is not affected obviously by various aging factors, the modified polyurethane PU and modified polyurethane PUR composite materials also show good aging resistance.
Metal Oxide Nanostructures-Based Gas Sensor for Ethylene Detection: A Review
Authors: Xing Yanxia , Zhu He , Chang Guifang , Yu Kexue , Yue Fengli
Published: December 2019

Increased ethylene content may induce the synthesis of respiratory enzymes and enhance respiration, which accelerated fruit ripening. Monitoring of ethylene concentration is critical in the fruit industry, avoid the fruit from passing through. Research interest has focused on the utilization of nano-sized semiconductor to monitor the ethylene through various processes. As detection for ethylene with excellent sensitivity, superior quantum efficiency, and fast response speed, nano-sized semiconductors are regarded as the most promising directions for nanomaterials. We review the latest achievements with nano-sized material gas sensors as for ethylene detector in the article. Firstly, the classification and structure of semiconductor detectors are introduced (such as resistive transducer; non-resistive transducer; organic semiconductor gas sensor), Then we present several kinds of and their performance, focusing on binary oxides with wide band gap (such as ZnO, SnO2, Ga2O3, Nb2O5, and WO3) and ternary oxides (such as Zn2SnO4, Zn2GeO4, and In2Ge2O7) Eventually, finally, we review and summarize the perspectives in this field and the prospects for future research. Perspectives and outlook on future research directions in this field.
The Effect of Diamond Wheel Wear on Surface and Sub-Surface Quality in Fused Silica Optics Grinding
Authors: Zhou Lian , Wei Qiancai , Li Jie , Chen Xianhua , Wang Jian , Xu Qiao
Published: December 2019

During the ultra-precision grinding process of fused silica optics, the micro-removal processes of brittle and hard fused silica material by diamond grits in different wheel wear states are inconsistent, which leads to the instability of the grinding quality of the components. First, the wear forms of diamond wheel in the process of grinding brittle and hard fused silica material were analysed. The main wear form of diamond grinding wheel was diamond abrasive wear. Then taking the cumulative removal volume of material as the evaluation parameter of wheel wear state, the evolution laws of surface roughness and sub-surface defects of components under different cumulative removal volume of material were studied. With the aggravation of grinding wheel wear, the surface roughness and depth of sub-surface defects layer decreased first, and then fluctuated and increased slowly. In the rapid wear stage, the falling diamond particles scratched deep grooves on the surface of components, and the roughness and sub-surface depth increased sharply. According to the results, it’s reliable to monitor the wheel wear state and predict the life of wheel.
Steganalysis by Recombining Spatial Rich Model
Authors: Gan Ling , Sun Ning
Published: December 2019

Steganalysis is an important topic in the field of information security. Steganalysis is mainly based on the traditional machine learning method, represented by the spatial rich model, and has high detection performance. Aiming at the problems of high feature dimension, strong redundancy and long feature extraction time in the spatial rich model, this paper conducts a series of feature selection operations and explores four different model combination methods: single quantization factor combination method, single filter kernel type combination method, mixed selecting combination method, Pearson correlation coefficient combination method. In addition, a feature preprocessing means are added. The experiment proves that the combination of mixed selecting combination and Pearson correlation coefficient can be stable with the performance of steganalysis before dimension reduction, but the performance dimension ratio is higher.
Study on electrical properties of Nano SiO2/Phenolic-resin Superamphiphobic composite insulation materials
Authors: Guo Kai , Wu Kai , Li Xingeng , Jiang Bo , Wu Yaping , Tian Shuang
Published: December 2019

In this paper, based on the key problems of super-bispecient insulation materials, a new nano-SiO2/Phenolic resin-based super-bispecient material was studied through blending process. The combination fastness between microcosmic rough structures and substrates and between microcosmic rough structures in existing technologies is not enough, and the rough structures are easy to be destroyed, which makes the prepared superamphiphobic surface not durable. Therefore, the study of superamphiphobic surfaces with wear resistance and repairability is a powerful guarantee to solve this problem.
Experimental Analysis of Radial Tire Stiffness and Grounding Characteristics
Authors: Sun PengFei , Feng GuanYong , Zhou ShuiTing , Qiu ChaoZhi , Fan JunWen
Published: December 2019

The radial tire was tested by the tire comprehensive testing machine to analyze the stiffness characteristics and grounding characteristics of the tire under different tire pressure and vertical load. The results show that the stiffness of different directions changes when the tire pressure increases. The longitudinal stiffness increases slightly and the torsional stiffness increases when the vertical load increases. As the vertical load increases, the tread impression changes from the ellipse to the approximately rectangle, and the area of the tread impression is slightly increased. As the tire pressure increases, the area of the tread impression is significantly reduced.
A Study on Obstacle-surmounting Performance of Sand Milling Vehicles
Authors: Sun Ye , Hu Hao , Liang Xiaodong , Yin Kun , Yang Dan
Published: December 2019

According to the changing characteristics of the geological environment of Gobi desert pollution abatement area, this paper introduces a kind of milling vehicle of 3point supporting type. The general equilibrium equations under the simultaneously surmounting obstacle by front wheels were derived using a simplified obstacle surmounting mechanical mode. As in a complex environment, the key terrain obstacle parameters are uncertain and the traction force to surmount the obstacle is also uncertain. This paper uses fuzzy sets method for terrain angle and the traction force needed by the vehicle to surmount the obstacle was calculated. By establishing a wheel-road model and using multi-dynamics software, the simulations showed that the theoretical results were reliable.
Research Progress in Preparation of Graphene
Authors: Wang Yufang
Published: December 2019

Graphene have excellent physical and chemical properties, so the preparation of graphene is becoming the focus of material science research. The main preparation methods of graphene are reviewed, including mechanical stripping, chemical oxidation-reduction, chemical vapor deposition, SiC epitaxial growth, electrochemical and so on. At the same time, the advantages and disadvantages of these methods were discussed. And the development of graphene is prospected.
Basic Research Progress of Promoting Blood Circulation and Removing Blood Stasis Jingfang on Diabetic Nephropathy
Authors: Li Xiaobing , Liu Wen , Wang Xiao , Huang Mingming , Xue Qian , Wang Tian , Cao Yuanyuan , Li Wenjing , Cao Zhaoxia , Han Mian , Luo Linzhao
Published: December 2019

Clinical studies have demonstrated that Jingfang can effectively reduce urine protein and delay the process of DN. Jingfang of promoting blood circulation and removing blood stasis which has a long history in the treatment of diabetic nephropathy. It has many effects such as anti-oxidation, lipid-lowering, and hypoglycemic effect. To this end, this article reviews the basic research progress of the prevention and treatment of DN about Jingfang of promoting blood circulation and removing blood stasis.
Point Cloud Registration Method for Pipeline Workpieces Based On NDT and Improved ICP Algorithms
Authors: Xue Shan , Li Guangqing , Lv Qiongying , Meng Xianyu , Tu Xin
Published: December 2019

A new point cloud registration method based on NDT and improved ICP algorithm is proposed to solve the problem of point cloud registration of laser scanning workpiece position and pose data on industrial pipeline. Firstly, according to the FPFH algorithm, the feature points of point clouds are extracted to reduce the number of point clouds. Then, the normal distribution transformation (NDT) is used to achieve rough registration of point clouds, so that the two point clouds have relatively good initial position and posture. Finally, based on the traditional ICP algorithm, the k-d tree is used to accelerate the search speed of the corresponding point pairs and complete the accurate registration of the point clouds. The proposed algorithm and the NDT+ICP algorithm are tested respectively, and the results show that the proposed algorithm is faster, with lower error and fewer iterations, which provides a reference for similar problems.
A Method for Real-Time Suppression of In-Phase Error of Silicon Micro Gyroscopes
Authors: Liang Jie , Qiu Anping , Zhao Yang , Xia Guoming , Shi Qin
Published: December 2019

This paper reports a method to suppress the in-phase error of silicon micro gyroscopes in real time, which can realize long-term stability, without significantly affecting the sensor noise. The in-phase error suppression is by periodically changing the polarity of the drive mode, and the bias (zero rate output) decreases from -7.8deg/s to -3.9deg/s, attenuation amplitude of which is about 3.9deg/s. By sampling the output using information fusion technology, low shirt-time noise and bias instability can be obtained without cutting off the gyroscope and adding additional sensors, the bias instability of which is reduce from 35.0 deg/hr to 10.8 deg/hr. The feasibility of the approach was experimentally evaluated using a MEMS gyroscope with the algorithm implementation on FPGA in real-time.
Sediment Re-Suspension and Release of Dissolved Heavy Metal Cu under Wave Actions
Authors: Zhang Haoqing , Jia Yonggang , Lu Fang
Published: December 2019

Located in the semi-enclosed Bohai Sea, the Yellow River subaqueous delta faces serious pollution by the heavy metal Cu in seabed sediments and is frequently subject to storm surges which further incur sediment re-suspension or even liquefaction, and cause Cu to be released back into seawater. This study performed an indoor wave flume experiment to simulate the release of Cu into overlying water under different hydrodynamic conditions in three phases: static diffusion, seabed nonliquefaction and re-suspension, and seabed liquefaction and re-suspension. As indicated by the results, the concentration distribution of Cu in overlying water was closely related to that of suspended sediment and had consistent change trends. Sediment liquefaction clearly promoted the release of Cu into overlying water, and the dissolved Cu concentrations in the overlying water during the seabed liquefaction and re-suspension phase were 18 times those in the static diffusion phase, and 11 times those in the seabed non-liquefaction and re-suspension phase. In addition, seabed liquefaction caused Cu in sediments to diffuse towards deeper levels, and the diffusion depth of was about half of liquefaction depth.
Study on Manual Tin Welding Technology of Platinum Wire-Copper Wire
Authors: Liu Zhibin , Yin Pu , Wang Zaicheng , Wang Yu , Wang Wei
Published: December 2019

Taking the manual welding of platinum wire and copper wire for spacecraft as the research object, the principle of manual welding of platinum wire and copper wire and the mechanism affecting the welding quality are analysed and studied, and the optimal technological parameters of manual welding of platinum wire and copper wire are optimized through the verification of manual welding process test.
Design and Implementation of Micro Temperature Control System Based on PWM
Authors: Zhu Yajie , Wang Yaxin , Dong Ting , Zhang Peng , Yang Mingming
Published: December 2019

With the application of temperature control system in space remote sensors becoming more and more widespread, and with the increasing demand for high resolution of space remote sensors, the requirement of high precision and miniaturization of the temperature control system of remote sensors is constantly increasing. This paper mainly introduces the working principle of a self-closed micro temperature control system based on UC1825 high-speed pulse width modulation (PWM) controller. According to compare the target temperature with the acquisition temperature, it uses the controller for voltage modulation and outputs PWM pulse width with different duty cycles. And then it controls the on/off of the MOSFET to control the heating time of the controlled object. And finally a self-closed micro-temperature control system based on UC1825 is realized. Currently, the measurement and temperature control performance of the micro-temperature controller on orbit distributedly installed near the controlled object are good.
Emergy Ternary Evaluation of Industrial Agglomeration Area
Authors: Zhao Yu , Miao Yu , Li Lihong , Lu Xu
Published: December 2019

The development status, ecological efficiency and sustainability of two industrial agglomeration systems with different economic and environmental foundations in Liaoning Province were analyzed by using emergy phase diagram analysis method. The results show that the phase diagram analysis method is more systematic and comprehensive in analyzing the development process, current situation and possible future development direction of the system. The emergy phase diagram provides an effective research tool for the emergy analysis method.
Study on Sleeping Sites Selection of Macaque Mulatta at Lu Mountain, Sichuan Province
Authors: Qi Dongming , Zhou Ping , Li Xiaoyan , Li Fengqin , Tang Lin , Zhao Jingang
Published: December 2019

Interview technique, field investigation and quadrat sampling method were used to study the sleeping sites selection by Macaque Mulatta in Lu Mountain, Sichuan Province. 5 sleeping sites selection were recorded in the investigation. 12 quadrates (10m*10m) and 15 habitat factors were measured and calculated with principal component analysis. The results showed that the characteristics of the sleeping sites were the area of 1600m-1700m, the middle slope position of slope land with slope of 20°- 40°, certain macrophanerophytes density, the average DBH of the sleeping tree were less than 15 cm, the sleeping height were less than 6 m, the theropencedrymion with medium concealment, less disturbed human activities. The principal component analysis showed that the first 6 factors contributed 82.242% of the total variance reflecting the characters of the sleeping sites. It was indicated that the main ecological factors affecting the sleeping sites of the Macaca mulatta in Lu Mountain were terrain, sleeping height, feeding point distance, road distance, human interference distance, concealment, slope direction, etc.
Research on Sharing Bicycle Service Quality Evaluation Based on Improved IPA
Authors: Zhang Yan
Published: December 2019

With the gradual implementation of the standardization and remediation measures of the sharing bicycle market, it is increasingly important for sharing bicycle platform to maintain a competitive advantage by improving service quality. Taking the campus sharing bicycle as the research object, used exploratory factor analysis method to further improve the evaluation indicators through the physical design of the bicycle body and the safety factors of the riding process, and finally established a service quality evaluation index system of 5 dimensions and 20 factors based on SERVQUAL scale. Taking Wuhan University as an example, the Weizhao Deng’s partial correlation coefficient method is used to analyze the improved IPA model, and the priority of the improved factors is refined. On this basis, some suggestions are provided for improving the quality of sharing bicycles services.
Research on operation strategy optimization method of multi-energy complementary new energy generation system
Authors: Wang Liying , Zeng Ming , Cao Yuwei , Tian Shi , Xu Xuefeng , Yang Jun
Published: December 2019

Qinghai province has a rich variety of energy, how to make the multi-energy complementary new energy generation system better participate in the multi-type market trading has become an important issue. Can complement each other in this article, through analysis of new energy power generation system in power generation, FM, load, and the structure of the secondary market, as well as benefits, build scenery storage and participate in ancillary service market strategy optimization model, and through the empirical analysis to study the electricity trading and energy storage and heat in peaking and frequency modulation strategy and returns, help to Qinghai province to carry out the pluripotent complementary new energy power generation system involved in kinds of market transactions, as the nationwide can complementary and new energy power generation system in many model driven market transactions.
Power Regulation Strategy of Virtual Pumped Storage Power Station Based on Compressed Air Energy Storage
Authors: You Jiayu , Jiang Tong
Published: December 2019

The virtual pumped storage power station based on compressed air energy storage combines compressed air energy storage and pumped storage technology organically, complements each other’s advantages, and adopts efficient hydraulic equipment to compress air. In the process of power regulation, the head of high-pressure pool is controlled to be constant, the efficiency of pump-turbine unit is improved, and the power station is operated efficiently and steadily. In this paper, a 1 MW pumped storage power station is designed, and the power regulation strategy for stable operation of power generation and electric conditions is put forward. The mathematical model of each module of the power station is established. According to the power regulation instructions, the ideal values of the operation parameters of the power station are calculated, and the regulation instructions are given to the driving equipment of the hydraulic transformer. The running process of the hydraulic piston and the fluctuation of the head of the high-pressure pool are also simulated and analyzed, which verifies the feasibility of the strategy.
Investigation of Heat Transfer Characteristics on Rod Fastening Rotor
Authors: Li Yiping
Published: December 2019

In order to study the contact heat transfer characteristics on the joint interface of the distributed rod fastening rotor under the influence of different pretension and the roughness of different wheel disk. The thermal contact resistance fractal model on the joint interface of the distributed rod fastening rotor is established, and the thermodynamic calculation of the rod fastening rotor is carried out. A contact heat transfer characteristic test rig for the rod fastening rotor is designed and built. The temperature field of the rod rotor is measured with the change of the tension force of the pull rod and the surface roughness of the wheel. The results show that the heat transfer coefficient of the joint interface increases with the increase of the pretension of the rod, and decreases with the increase of the surface roughness of the wheel. The thermal contact resistance fractal model of the joint interface is verified, and it is proved that it is suitable for the study of the thermal contact resistance on joint interfaces.
Bimodal Fitting of Atomic Hydrogen Spectrum in Hydrogen-argon Mixed Gas Plasma
Authors: Luan Bohan , Zhao Yongpeng , Zhao Weijiang
Published: December 2019

In the research field of new energy sources, hydrogen energy has become the same green energy as solar energy and wind energy. Fractional hydrogen atom is a hypothesis of a new atomic state, which proposes that under the action of certain catalysts (such as Ar+) hydrogen atoms of ground state can transit to the energy level of fractional principal quantum number that lower than the ground state energy level, and releases a lot of energy at the same time. The results of this study are as follows, fitting the measurement results of the hydrogen Balmer α line, and by which obtaining the bimodal structure of the spectrum. The analysis of the fitting results shows that the bimodal structure well explains that the hydrogen atoms in the hydrogen-argon plasma can be divided into two components: high temperature and low temperature, and the more accurate fitting line of the hydrogen atom spectrum broadening can be obtained by this fitting method.
Fracture Analysis of the Main Valve Stem in the Steam Turbine
Authors: Qiao Lijie , Fang Lulu
Published: December 2019

The failure analysis of the main valve stem in the steam turbine made of 2Cr12NiMo1W1Vis presented.The failure of the main valve stem in the steam turbine occurred at 11 operating years.Several examinations were carried out to identify the main valve stem failure’s root cause: macroscopic inspection, chemical composition analysis, hardness test, metallographic analysis, mechanical properties analysis.It is found that there are multiple cracks in the fracture of the valve stem. From the lines, it can be seen that the cracks develop from the inner wall of axial and radial holes to the outer diameter of the valve stem, and finally break in the outer wall of the four quadrals.The material performance of the valve stem is lower than the reference standard GB/T 8732-2014 and the manufacturer’s requirements, which is the internal factors of the valve stem fracture. The axial cross opening of the valve stem and the center of the axial inner hole do not coincide with the valve stem center. Local stress concentration and additional stress are the external (mechanical) factors of the valve stem fracture.It is suggested to contact steam turbine manufacturers to optimize the valve stem structure, to avoid the influence of axial cross orifice stress concentration, and to avoid the factor that may produce additional stress; Check and accept valve stem in strict accordance with manufacturer’s standard, including but not limited to valve stem material quality certificate, geometric dimension review, spectrum, etc.
Parameter Identification of Lithium Iron Phosphate Battery Model for Battery Electric Vehicle
Authors: Wang Shang , Chen Qingzhang , Wang Kang , Wang Zhengyi , Wang Yao
Published: December 2019

The third-order equivalent circuit model of battery electric vehicle lithium iron phosphate battery has been established. According to the characteristics of lithium iron phosphate battery in charging and discharging process, the data of open circuit voltage change during battery test were used to identify the third-order equivalent circuit model parameters. The joint simulation of lithium iron phosphate battery discharging based on NEDC operating condition was carried out by using MATLAB and ADVISOR software. The lithium iron phosphate battery was tested on the power battery test platform. The results show that the maximum relative error between the value of simulation and test is small. The trend of the simulation and test curve is in good agreement. Moreover, the characteristics of the lithium iron phosphate battery are described well by the third-order equivalent circuit model. The results demonstrate that the third-order equivalent circuit model has high accuracy.
Sitting Posture Recognition Based on OpenPose
Authors: Chen Kehan
Published: December 2019

Sedentary and poor sitting posture can damage the health of adolescents. Therefore, it is very practical to effectively detect the sitting posture of students in the classroom and to warn the bad sitting posture. This paper proposed an in-class student sitting posture recognition system based on OpenPose, which uses the monitor in the classroom to detect the sitting posture of the students, and uses OpenPose to extract the posture feature. Keras deep learning framework is used to construct the convolutional neural network, which is used to train the datasets and recognize sitting posture of students. Experiments show that the accuracy is more than 90% after 100 epoch training.
Design of Gas Early Warning System Based on Bluetooth Technology
Authors: Jing Haowen
Published: December 2019

Gas alarm has now become a kind of home necessary products, but most gas alarms on the market integrate concentration monitoring and alarm functions in one part, mainly installed in the kitchen. For people who rest in the bedroom, they cannot be informed of the danger in time, which may lead to serious consequences. Taking this hidden danger into account, a warning system that can simultaneously alarm the kitchen and the bedroom was designed. The system uses Bluetooth technology as the communication basis with two STC89C52 single-chip microcomputers as the CPU to realize the function of delivering the concentration information obtained by the kitchen to the bedroom, and thus achieve the sound and light alarm in multiple positions.
Research on Optimization Scheduling Simulation System of Electric Vehicle Charging Station Based on CPLEX Model Technology
Authors: Sun Yizhe
Published: December 2019

The construction of intelligent charging and replacement grids for electric vehicles, such as centralized charging stations, charging and replacement stations, and charging piles, is a more reasonable business model for the large-scale development of electric vehicles in densely populated areas. For the charging mode of centralized charging and unified scheduling, it is necessary to consider the influence of the FM capacity service decision to ensure the orderly charging of the charging station under the power market situation. Based on this background, the thesis aims at maximizing the revenue of electric vehicle charging stations. Based on the CPLEX simulation model for the charging period optimization of electric vehicle charging stations, the paper fully considers the synergistic scheduling of the energy market and the current FM market. The rod optimization model uses three methods of disordered charging, centralized control charging, and distributed charging to compare its influence on the daily load curve. The final paper validated the versatility and reliability of the policy system and helped to complete the orderly scheduling of the electric vehicle charging station.
Dynamic analysis of reciprocating compressor with two revolute joint clearances
Authors: Cheng Shouguo , Chen Huwei
Published: December 2019

Dynamic analysis of reciprocating compressor with two joint clearances is studied. In order to investigate the nonlinearity of the system, the dynamic equation of the system is established based on Lagrange method. By changing the parameters of the system, the response of the system under different sizes of joint clearance and crankshaft speed is obtained. From the simulation results of the system, we can see the influence of crankshaft speed and joint clearance on the system dynamics. By calculating the phase diagrams and the maximum Lyapunov exponents, it can be concluded that the motion of the system is chaotic.
Design of Liquid Level and Generator Temperature Display System for EDG in Nuclear Power Station
Authors: Zhou Yong , Zhu Pengshu , Chang Xincai
Published: December 2019

At present, EDG used in nuclear power plants is relatively old. The main means of EDG condition monitoring is the on-site dashboard installed in the EDG factory, which shows the relevant thermal parameters of operation. The instrumentation equipped in the factory can only display the current value of the liquid level of the diesel engine and the temperature of the stator coil of the generator. It cannot view the historical data and has no function of data storage and transmission. At present, manual recording is carried out by means of periodic inspection, which cannot fully reflect the operation status of diesel engine, capture transient process and time series change process, and evaluate the health value of equipment. Moreover, the existing monitoring methods cannot detect abnormal conditions in advance before the serious failure of EDG. In this paper, the modification of the existing on-site instrument of EDG is discussed, and the intelligent display function of on-site liquid level and generator coil temperature is added, so that the device can be applied to the complex EDG working site.
Cost Analysis of the Super Department Reform in Universities---Based on the Cost-Utility Model
Authors: Huang Haochen
Published: December 2019

Super department reform can improve organizational operational efficiency. It is the direction of modern organizations. However, it should pay attention to the cost of the super department reform. This paper analyses the existing cost problems in the reform of the super department. Using cost theory to analyses the relationship between revenue and cost of the reform in universities. The cost mainly contain four aspects. They are establishment cost, operation cost, benefit friction cost and coordination communication cost. It is possible to make better improvements when we should clearly understand the cost problems in the reform.
The Structure, Stress and Modal Analysis of 1.6-Liter Gasoline Engine Connecting Rod Based on Finite Element Analysis
Authors: Zhang Maoqun , Zhao Chao , Yan Zhenqi , Yao Lijian , Yang Zidong , Hassa Muhammad
Published: December 2019

The three-dimension model of engine connecting rod based on 1.6-liter gasoline Engine was built using Solid works 2016. The stress and modal analysis of the built model were evaluated by Ansys Workbench. The results showed that the maximum tensile and compressive stress of engine connecting rod when performing of pulling and pressing force were 42.59 MPa and pressing 74.21 MPa respectively. The small end of connecting rod was an area which stress concentration. Last, a modal analysis was carried out, and the previous six order natural frequency and vibration mode were obtained. The effects of the stress and losing circle shape of the rod middle area on the working properties of the connecting rod were analyzed. After checking and calculation, this 1.6-liter gasoline engine connecting rod met the strength requirement. This study could provide theoretical evidence for the further optimization and design of engine connecting rod.
Strategic research on the development of China’s new energy automobile industry
Authors: Zhang Min
Published: December 2019

With the continuous development of economy and society, the development of automobile industry is faster and faster, but it also faces severe challenges. As is known to all, the traditional automobile industry USES oil as fuel. Although it can bring more efficiency to people’s travel, it also has serious pollution to the environment, and oil resources are increasingly scarce. Based on this situation, the development of new energy vehicles has become an inevitable trend, with a very huge market development space in the future. This paper first discusses the development status of China’s new energy vehicle industry, and then explores the problems existing in the development process of new energy vehicles based on its current situation. Finally, combining with the development characteristics of China’s new energy vehicle industry in recent years, the development strategy of new energy vehicle industry is formulated.
Innovative Design and Experiments of a Semiconductor Cooling and Heating Box Driven By Solar Energy
Authors: Song Cunyong , Zhu Jianlu , Yang Xinjian
Published: December 2019

Based on the research of semiconductor refrigeration, solar energy is introduced as the driving energy of semiconductor thermal effect, and the comprehensive utilization of semiconductor thermal and cold effects is deeply studied. Through theoretical design, experimental fabrication, testing and other research methods, a solar driven cold and warm box suitable for outdoor environment is designed and manufactured with semiconductor refrigeration chip as the core device. The results show that the cooling and heating effect of the new type of solar driven semiconductor cold and warm box is better. It not only has a wide range of applications in areas without electricity and lack of electricity, but also applies to areas with high level of development, such as as car cold and warm box, tourism cold and warm box or field operation cold and warm box. At the same time, in poverty-stricken areas such as Africa, where the disease is rampant, this cold and warm box can also be used for the cryopreservation of drugs and vaccines, which shows the potential for export.
Research on the Three-in-One Model of Agricultural Products E-commerce Logistics under the Combination of Resource Saving and Blockchain Technology
Authors: Wang Haiwen , Liu Ziyu , Liang Yong
Published: December 2019

Under the policy of the Belt and Road Initiative, global logistics development has entered a hot state. The policy calls for the state to promote agricultural reform has driven the development of agricultural e-commerce logistics. Building a resource-saving society needs to seize this favorable opportunity and make full use of favorable technologies and information to develop agricultural e-commerce logistics to achieve rapid economic transformation, thereby ensuring the sustainable and healthy development of the agricultural product economy. As a decentralized and de-trusted distributed shared data technology, blockchain itself is a kind of Internet protocol, which is valued by the logistics industry because of its multiple advantages such as cost saving, resource saving and information security. Based on this, the paper starts with the analysis of the relationship between blockchain technology and the sustainable development of resource-conserving society. It points out that there are problems and reasons in the integration of agricultural products e-commerce logistics, and finally put forward reasonable suggestions.
Influencing Factors of Dynamics of Industry-University Cooperative Network in New Energy Industry on the Performance of Industry-University Cooperative Innovation
Authors: Liu Zhaocheng
Published: December 2019

Based on the social network analysis method, by utilizing the patent data jointly applied by the industry and universities under the new energy industry, this paper will construct the industry-university cooperation network and the knowledge network of colleges and universities, as well as study the influencing factors of the dynamics of the cooperation network on the performance of industry-university collaborative innovation. Meanwhile, the moderating effect of structural attribute of knowledge network will be considered. It is found that the expansion and stability of cooperative network have a significant positive impact on collaborative innovation performance. Knowledge diversity in colleges and universities positively regulates the relationship between the dynamics of industry-university cooperative network and the performance of industry-university cooperative innovation.