bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation and analysis of energy consumption in the use of industrial building of wall panel
Authors: Li Zhiyong , Zhang Zehua , Cheng Yamei , Qiao Chunzhen 
Published: May 2020

Abstract
The energy consumption of industrial building wall panels in the use phase is simulated. The temperature variation and heat transfer of wallboard with different thickness of insulation layer in different climate zones were studied. The results show that the difference of daily average heat transfer is less than 0.01 MJ/M2 for the wall panels with different thickness of insulation layer in the same city in summer. However, the daily average heat transfer among cities is quite different. The daily average heat transfer of Guangzhou wallboard is the largest, which is more than 1 MJ/m2, followed by Beijing. The average daily heat transfer is maintained above 0.69 MJ/m2, and Shanghai’s wallboard has the least average daily heat transfer, only 0.32-0.33 MJ/m2. It can be known from the above data that Beijing needs to choose a composite wall board with a thermal insulation layer thickness of 6 cm in winter, Shanghai uses a composite wall board with a thermal insulation layer thickness of 4 cm, and Harbin chooses a composite wall board with a thermal insulation layer thickness of 6 cm or more to meet the insulation requirements.
Green synthesis and possible applications of MoO2 nanoparticles
Authors: Ye Qianjin , Wang Yu , Wu Guangliang , Yu Yan , Wang Furong , Li Jing 
Published: May 2020

Abstract
This work reports the green hydrothermal synthesis of MoO2 nanoparticles and their applications in Cr6+ adsorbent and MoO3 precursor. A green hydrothermal method, which was based on the autoclave-sealed reactions of (NH4)6Mo7O24•4H2O and glucose in acetic acid (12.5 vol%) aqueous solution at 190 °C for 12 hours, was proposed for the synthesis of MoO2 nanoparticles. The characterization results from X-ray diffraction and transmission electron microscopy suggested the successful preparation of pure monoclinic phase MoO2 (m-MoO2) nanoparticles. The m-MoO2 nanoparticles exhibited a good adsorption capacity for Cr6+ (for example, 300 mg of m-MoO2 nanoparticles can adsorb the whole Cr6+ in 300 mL of 50 mg/L K2Cr2O7 aqueous solution after mixing for 280 minutes). Besides, the m-MoO2 nanoparticles can be completely converted to orthorhombic phase MoO3 nanoflakes after heating in air at 400 °C for 5 hours.
Analysis and Research on Safety Evaluation of Oil and Gas Pipelines in Goaf
Authors: Wang Dongyuan , Zhang Zhengyong , Tan Qiuxia , Yang Jian 
Published: May 2020

Abstract
Through the analysis of the subsidence of the mined-out area of the mine, the characteristics and laws of its subsidence can be mastered. According to different subsidence types and subsidence, a reasonable calculation model is used to calculate and analyse the stress of the pipeline, and the stress and strain values at different points of the pipeline are obtained. At the same time, by studying different pipeline laying methods, a reasonable pipeline laying method is selected from them to meet the adaptability of the pipeline to the ground subsidence of the goaf. When optimizing the laying method of the pipeline, the design concept and method based on the strain are used to put forward requirements for the strain of the pipeline, formulate reasonable design guidelines, and finally determine reasonable countermeasures according to the design guidelines, thereby improving the design level of the mine’s goaf pipeline, and ensure the intrinsic safety of the pipeline and coordinate the relationship between pipeline construction and mineral exploration.
Green and Efficient Method for Recycling Valuable Metals from Scrapped Lithium Cobalt Oxide Cathode Materials
Authors: Guo Miaomiao , Xi Xiaoli , Zhang Dongdong , Yang Hang , Bi Fan , Hu Yi , Nie Zuoren , Xu Kaihua 
Published: May 2020

Abstract
In this study, green and efficient method for recycling valuable metals from scrapped lithium cobalt oxide cathode materials to form lithium carbonate and cobalt powder was proposed. To this end, aluminum and iron impurities were efficiently removed from scrapped lithium cobalt oxide cathode materials through alkali dissolution and magnetic separation with removal rates of 99.9% and 98.3%, respectively. After removal of impurities, lithium cobalt oxides were reduced by hydrogen at high temperature of 650 °C for 3 h to yield Li2O, Co, and very small amounts of CoO and LiOH. Next, the mixture was subjected to water leaching and sodium carbonate precipitation to obtain lithium carbonate with purity of 99.5%. The water-leaching Co and small amounts of cobalt oxides were again reduced by hydrogen to form cobalt powder with purity of 99.4%. In sum, the proposed method looks promising in terms of efficiency, easy for implementation, environmentally-friendliness, and potential industrialization.
A DFT study of Co8S6(PH3)8 on Stability and Magnetic
Authors: Li Ting 
Published: May 2020

Abstract
The structural, electronic and magnetic properties of Co8S6(PH3)8 and Co8S6(PH3)m(CO)n (1<=n<=2) clusters have been studied in detail using the first-principle method based on density functional theory. The presence of CO can significantly enhances the activity of Co8S6(PH3)8 clusters and manipulates magnetic properties. Detailed PDOS analysis shows that the charge transfer from Co atom to CO reduces the magnetic moment of the corresponding Co atoms. Not only by decreasing the Fermi level of the Co8S6(PH3)8 from -3.02 eV to -3.22, -3.41 eV, but also disappearing the H-L gap at the Fermi level.
ANSYS Simulation Model of Buried Metal Pipeline Corrosion Detection
Authors: Zhang Chunmei , Liu Longhuan , Liao Xian , Hu Xuquan , Fu Zhihong , Li Bo 
Published: May 2020

Abstract
Corrosion testing of buried metal pipelines is an important measure to ensure the safe operation of pipelines. In order to investigate the transient electromagnetic field named response of buried metal pipelines, a three-dimensional simulation model was established by using multiphysics simulation software named ANSYS Multiphysics to calculate and analyze buried metal pipelines with different corrosion degrees, ie different wall thicknesses, on the receiving coil after the excitation signal is turned off[1]. The induced electromotive force changes, the results show that the larger the wall thickness, that is, the smaller the corrosion degree, the slower the attenuation of the induced electromotive force curve of the receiving coil, the smaller the wall thickness, the faster the attenuation; and the verification was experimented: the transient electromagnetic method can effectively detect the degree of corrosion of metal pipes buried under the ground.
Influence of Pollution Degree and Humidity on the Discharge Characteristics of Porcelain Insulators in Fog Chamber Environment
Authors: Pei Shaotong , Zhang Zhe , Liu Jiashuo , Li Yonglin , Liu Yunpeng 
Published: May 2020

Abstract
In order to study the influence of pollution degree and humidity on the discharge characteristics of porcelain insulators in a fog room environment, this paper uses Comsol Multiphysics software to simulate the electric field distribution of clean and dirty insulators in a 110kV transmission line with or without a fog room. The results show that the electric field around the clean insulator in the foggy room becomes larger at the high-voltage side and the low-voltage side becomes smaller than that in the non-fog room; and the electric field around the insulator in the fog room becomes larger as the contamination increases.
Research on Optimal Control of PFC of Thermal Power Units in DC UHV Grid
Authors: Li Jun , Miao Weiwei , Meng XiangRong , Gao Song 
Published: May 2020

Abstract
By analyzing the change of grid frequency during direct current(DC) ultra high voltage(UHV) faults this year, it is found that the use of conventional primary frequency control(PFC) technology in thermal power units cannot suppress the occurrence of extreme frequency of the power grid, and the conventional PFC method can no longer adapt to the frequency control of the power grid. By analyzing the control signals and control logic of the unit participating in the frequency regulation of the power grid, the PMU(phasor measurement unit) frequency signals that are closely connected to the power grid are introduced, and the second-order differential feed-forward is used to achieve overshoot compensation, which makes the frequency modulation action faster and more accurate, ensuring the power grid’s safe and stable operation.
Analysis on the determination of specific heat of air at constant pressure
Authors: Wang Yarong , Wang Peirong 
Published: May 2020

Abstract
Heat calculation is often encountered in industrial production and life. For example, the calculation of flue gas heat release or the heat absorption of working medium in thermal equipment in thermal power plant boiler is a common heat calculation. This paper mainly introduces the experimental principle and method of specific heat of gas, and measures the average specific heat of air at constant pressure. Through this experiment, we can be familiar with the basic measurement methods of temperature, pressure, heat and flow in the experiment. In this paper, we compare the experimental data with the actual data, and analyze the cause of the error.
Comparison between Chinese and British Standards for Strand Anchor Structure Design
Authors: Wang Jinfeng , Chen Taoxiao , Tian Yingchun , Hu Zhengkai , Yao Xingang , Li Liangquan 
Published: May 2020

Abstract
In this paper, the relevant provisions regarding the classification, safety factor, strand anchor structure design and corrosion protection design are compared between the British standard BS EN 1537:2013, BS 08081:2015 and the Chinese national standard GB 50086-2015, the main differences of the strand anchor design are summarized, which can be used as reference for other strand anchor designers and researchers.
Study on Primary Frequency Control of Power Grid Based on Flywheel Energy Storage Technology
Authors: Li Jun 
Published: May 2020

Abstract
The frequency regulation of power grid is the most valuable application direction of energy storage technology in the auxiliary services field. Through the analysis and comparison of different energy storage technologies, the energy storage principle of flywheel energy storage (FES), the design of motor controller and capacity selection method of FES system are introduced and analyzed in detail. With its strong short-time power capacity and easy change of adjustment direction, combined with conventional frequency modulation technology, it can be used as an effective auxiliary means of primary frequency control (PFC) to ensure grid frequency stability.
Analysis of fire failure of wind turbine in a wind farm in Northwest China
Authors: Wang Huai-Xiang , Ma Dang-Guo , Chun Zhou , Bin Niu 
Published: May 2020

Abstract
The accident fan is the first-stage wind farm unit. From 2011 to 2019, the transformation of low-voltage crossing, lightning protection, grid switch, engine room grid cabinet and frequency converter cabinet are gradually carried out, and the original main control system is updated. One day in 2019, a fire accident happened to the generator, most of the engine room covers were burnt, the top section of the tower tube had traces of oil overflow after combustion, and a large area of combustion damaged parts scattered around the tower base. The cause of the accident is that the two phases of the stator contactor are not completely disconnected when the network is disconnected, and the main circuit breaker of the tower base is not tripped when the stator contactor is in fault, and the fault current is not cut off in time, which is a design defect.
Study on calculation model of wind deflection response of transmission line
Authors: Xie Yan , Li Mu , Liao Yane 
Published: May 2020

Abstract
The wind deflection angle is directly related to the electric gap and the construction cost of the transmission line, so the accuracy of the wind deflection calculation method and the reasonable value of the relevant parameters are very important for the safe operation and economic rationality of the transmission line. In this paper, based on the nonlinear transient analysis method, the characteristics of aerodynamic damping on the transient response of transmission line wind deflection are revealed. At the same time, according to the code of transmission line design in China, the static wind deflection calculation method is used to solve the static wind deflection angle of transmission line, and the dynamic and static calculation models of wind deflection angle are compared.
State of Charge Effects on the Parameters of Electrochemical Impedance Spectroscopy Equivalent Circuit Model for Lithium Ion Batteries
Authors: Xiao Haiqing , Tao Ziqiang , Bai Hong , Wang Hongwei , Fu Yanling , Si Nianpeng , Bai Hua 
Published: May 2020

Abstract
It is essential to know the behavior of the battery at all relevant internal and external conditions when the battery cell is in the new and the aging state. Electrochemical impedance spectroscopy (EIS) is a viable approach that can be used in lithium ion batteries (LIBs) to investigate the electrochemical behavior. In this paper, in order to investigate the state of charge effects on the LIBs, three types of commercial LIB cells were used, and the EIS measurements were performed under 100%, 80%, 50%, 20% and 0% SOC, respectively. An equivalent circuit model (ECM) including two constant phase angle elements in parallel with resistor elements is established to study the impedance characteristics for LIBs. The influence of the state of charge on the parameters of the ECM was analyzed. Based on the results we think EIS combined with ECM simulation tool can be used to derive useful information for improving battery design and state of health prediction.
Research on the policy of renewable energy development in China
Authors: Pan Xiaodie , Zhong Hongsen 
Published: May 2020

Abstract
The 19th National Congress of the Communist Party of China once again stressed the task requirements of establishing and improving the economic system of green and low-carbon circular development and promoting the reform of energy system and the development of renewable energy. In the face of the new requirements of the new era, it is urgent for China to not only master the basic laws of the world’s renewable energy development, comply with the trend and trend of energy reform, but also promote the development of renewable energy based on national conditions and regional conditions, so as to achieve higher quality development of economy and society.
CO2 Hydrate Formation Promoted by a Bio-friendly Amino Acid L ‐ Isoleucine
Authors: Liu Zhengwen , Zeng Yanxian , Wang Weixing 
Published: May 2020

Abstract
We prove that L-isoleucine, a bio-friendly amino acid, can be used to greatly increased CO2 uptake kinetics in the formation of CO2 hydrate without stirring. As far as we know, L-Isoleucine is an accelerator that can effectively promotes the formation of CO2 hydrate (the gravimetric capacity achieved to 331 mg g−1 in 1000 min at a concentration of 0.2 wt%). We also provided a preliminary explanation for this promotion mechanism of L-isoleucine by comparing the structure-performance. Our results will provide a reference for exploring the promotion mechanism of CO2 hydrate.
Theoretical study on the structure and sensitivity of fused aza-cyclic nitro-containing compounds
Authors: Wang Linyuan , Pu Keyu , Liu Jian , Liu Yujing 
Published: May 2020

Abstract
As the heterocyclic compound with high detonation properties and low sensitivity, fused aza-cyclic energetic compounds have shown great research value and application prospect in recent years. In this paper, two series (30 kinds) of new fused aza-cyclic nitro-containing compounds were designed to be the research target, with good fused aza-cyclic molecules as the basic structure and nitrogen-containing high energy groups of nitro group (-NO2) and amino group (-NH2) as substituents. The DFT-B3LYP/6-31G (d) method was used to optimize the molecular geometry and analyze the vibration frequency. The calculation results show that all derivatives have no virtual frequency, and they are stable structures on the potential energy surface; The nitro group charge of compounds was obtained. The structure-activity relationship between molecular structure and sensitivity was studied. And change relation of the sensitivity and the parent structure of molecule, the type and number of substituting group and configuration was summarized, providing references for relevant researchers.
Research and application of fracturing process for low permeability reservoir of Triassic in Junggar Basin
Authors: Yang Hong , Ni Hongjian , Wu Tao 
Published: May 2020

Abstract
Baikouquan formation of Triassic in the northwest margin of Junggar Basin has long been regarded as the synonym of “alluvial fan, ultra-low permeability and no benefit”. Moreover, the effect of Triassic conglomerate reservoir reconstruction in Mabei oilfield is not obvious, which leads to ineffective production and benefit development. In this paper, based on the research results and practical production application of Triassic conglomerate reservoir fracturing reconstruction technology in Junggar Basin in recent years, four kinds of adaptive reservoir reconstruction technology for low permeability conglomerate reservoir are explored, which effectively improves the single well production and realizes the increase of reserves and productivity in conglomerate reservoir exploration. (a) In view of the three reservoir conditions of multiple sets of sand layers, large vertical oil and gas display span and large difference of stress between each set of sand layer and surrounding rock, in order to ensure that multiple sets of sand layers are effectively reconstructed, the separate layer fracturing technology is implemented. Before fracturing, the process can realize circulation fluid replacement, and after fracturing, it can realize combined production; (b) For the reservoir with poor physical properties and high formation pressure, which cannot realize the stratified fracturing of tubing packer, the casing bridge plug layered fracturing technology is adopted; (c) In view of the fact that the oil and gas reservoirs are mostly located in the upper part of the thick sand layer and the fractures extend downward to easily connect the water layer, the reservoir reconstruction technology of secondary sand addition is implemented; (d) In view of the poor physical properties of the reservoir, the oil and gas production after the vertical well fracturing is not high, or the initial oil and gas production is high, but the production decline is fast, unable to stabilize the production for a long time, the horizontal well multi-stage fracturing technology is implemented. The successful field application of the open hole packer ball sliding sleeve fracturing technology and the bridge plug perforation combined fracturing technology in horizontal wells is realized. The research and practical application of adaptive reservoir reconstruction technology further promote the reconstruction of Triassic low permeability conglomerate reservoir and single well production increase in Junggar Basin. It can be used for reference in other basins for low permeable conglomerate reservoir fracturing, and it presents good application value.
Study on the spatial distribution characteristics of urban innovation power in Yangtze River Delta urban agglomeration
Authors: Liu Jing , Dou Yitao , Lu Yanwen , Yang Li 
Published: May 2020

Abstract
Based on the evaluation index panel data of innovation capacity of 26 cities in the Yangtze River Delta urban agglomeration from 2013 to 2017, the global entropy method and exploratory spatial data analysis method (ESDA) were used to evaluate and analyze the spatial characteristics of urban innovation capacity. The results show that: (1) From 2013 to 2017, the innovation capacity of the Yangtze River Delta urban agglomeration has an obvious regional difference, showing a distribution pattern of “Strong In The East And Weak In The West” on the whole. (2) From 2013 to 2017, the innovation capacity of the Yangtze River Delta urban agglomeration shows significant positive agglomeration characteristics in space. (3) The spatial agglomeration evolution of the innovation capacity of each city has obvious spatial locking characteristics. Based on the research conclusion, this paper puts forward some suggestions on strengthening urban innovation connection, improving innovation structure, increasing innovation investment and strengthening scientific and technological strength.
Airfoil shape optimization based on Non Uniform Rational Bspline and optimization algorithm
Authors: Sun Zhaocheng , Li Zengliang , Fan Menghao 
Published: May 2020

Abstract
In this article, we propose an innovation method of airfoil shape optimization, on the premise of ensuring the fitting accuracy; try to improve the smoothness of the airfoil. Non Uniform Rational B-Spline and quadratic penalty function are employed to parametric modelling and smoothness optimization. The monotone curvature variation is used to design smooth curves and least squares method ensuring high fitting accuracy. This program has been tested for a standard NACA 2415 and S825 airfoil and optimized to improve its smoothness. The results of optimization examples show that this method has high efficiency and precision.
Summary of Key Performance and Testing Methods for Thermal Storage Materials
Authors: Chang Liang , Zhang Gaoqun , Tan Hui , Deng Zhanfeng , Xu Guizhi , Song Xiaoyun , Cai Linhai 
Published: May 2020

Abstract
The development and application status of the key performance testing technology of heat storage materials in the application process are reviewed. According to the practical application requirements in terms of heat storage capacity, heat exchange capacity, material strength, service life, etc., the key performances of thermal storage materials that need to be focused on are sorted out, and the relevant testing techniques for each performance are sorted out and summarized. The specific test methods applicable to high-temperature heat storage materials are analyzed, and the related test technologies and evaluation methods for future heat storage materials are prospected.
A Novel Electronic Component Classification Algorithm Based on Hierarchical Convolution Neural Network
Authors: Hu Xiaomei , Xu Jun , Wu Jun 
Published: May 2020

Abstract
In the paper, the author proposes a recognition and classification algorithm of electronic components based on hierarchical convolutional neural network (NH-CNN) that reduces the computational complexity on the drawbacks of traditional image classification method based on deep learning such as the failure of effectively combining multiple deep characteristics, the poor performance of classifier, the difficulty of parameter adjustment and the long training time. The algorithm is trained through the Convolutional Automatic Coding (CAE) layer to obtain relevant feature maps, which reduces the input parameters of the designed convolutional neural network. Since the CAE model and the convolutional neural network have similar convolution and pooling operations, the feature maps obtained from the CAE model are put into the designed neural network based on the transfer learning method. Finally, the feature fusion method is used to output the obtained features to the fully connected layer, which is used to better express the depth information contained in the electronic component images and improve the accuracy of classification. The experimental results show that the proposed algorithm can effectively extract depth features with high precision of 94.26% and less complexity and overcome the defects of traditional image classification algorithms such as manual image extraction and low classification efficiency.