bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation and characterization of a new type of 304 stainless steel metalocking key
Authors: Ge Shaoliang , Wang Yaning , Song Wendong , Ji Lili , Cai Lu , Zhang Yuejun 
Published: December 2019

Abstract
The preparation process of metalocking key from 304 stainless steel was studied, and the mechanical properties of raw materials and metalocking key were studied. It is found that after this preparation process, the hardness of metalocking key increases by more than 20%, the tensile strength increases by more than 50%, the yield strength increases by more than 120%, and the elastic limit increases by more than 50%. Finally, scanning electron microscope (SEM) element analysis and metallography were used to characterize the microstructure analysis. It indicated that much of the austenitic stainless steel is converted to martensite due to cold rolling, which led to the significant strengthening of metalocking key properties.
Research on Modeling and Characteristic Parameters Consistency of Retired Lithium Power Batteries
Authors: Li Lifu , Li Jifei 
Published: December 2019

Abstract
For retired power batteries, it is difficult for single cell to meet the power requirements, and there is a problem of poor consistency between multiples. Therefore, re-grouping and consistency assessment are required for cascade utilizaton of retired batteries. In this paper, the remaining capacity test and HPPC test of retired lithium power batteries were carried out. And then the consistency of characteristic parameters of retired batteries under different SOC conditions was compared and analyzed based on capacity, internal resistance and other parameters. The results show that as the battery discharges, the ohmic internal resistance increases, and the consistency of polarization resistance and polarization capacitance are obviously deteriorated. Therefore, it is more reasonable to group them into consistent groups according to the electrochemical parameters of retired batteries at high discharge depth. Moreover, there is no strong correlation among the characteristic parameters such as open-circuit voltage, internal resistance and capacitance. Multiple parameters are required to evaluate the consistency of retired lithium batteries.
Charging Characteristics of Sulfur powder in Elbow of Pneumatic Conveying System
Authors: Juan Lv , Yu Fu , qiangqiang Lv , Bin Wang , Jianbo Wang , Haiyan Chen 
Published: December 2019

Abstract
Eliminating static electricity is a difficult thing for pneumatic conveying. In this paper, the most representative powder sulfur is selected as the research object. Therefore, in order to study the influence of pipe elbows on the charging characteristics, pneumatic conveying experimental platform was applied to conduct experiments to investigate the synergistic effects of airflow velocity, particle mass flow rate, particle water content and particle size on the charge characteristics, and the optimal ratio of elbow was designed. The results show that, when the particle size was constant, the charge-mass ratio increases with the increase of the airflow velocity, showing a linear positive relationship and increases firstly and then decreases with the increase of mass flow. When the airflow velocity was constant, particles were -40 μm, the effect of particle size on the charge-mass ratio becomes more significant. When the particle size was +40 μm, the charge-mass ratio of sulfur powder increases with the decrease of particle size, the influence is not notable. When the mass flow kept constant, the charge-mass ratio of sulfur powder increases as the particle size decreases. When the water content increases from 0 to 0.4%, the charge-mass ratio decreases by 14.3%-16.9%. However, if the water content continues to increase, the charge-mass ratio is stable. The charge-mass ratio of sulfur powder decreases with the increase of the bend ratio of right-angle elbow. As the technological layout is satisfied, the bend ratio can be increased to the range from 2.5D to 3D appropriately. This research can give reference to the design of sulfur powder pneumatic conveying system, so that the reasonable system ratio can be ensured.
Molecular Simulation of bioalcohol purification in ZIF-1, -3, -7 and -9 frameworks
Authors: Liu Xiuying , Yuan Junpeng 
Published: December 2019

Abstract
Using the Grand Canonical Monte Carlo (GCMC) method, the adsorption properties of ethanol and water on the four ZIFs (ZIF-1, -3, -7 and -9) have been investigated with different conditions. Their storage capacities of pure ethanol and water at different temperatures and pressures have been compared. And the mixture adsorption of ethanol and water and the adsorption selectivity of ethanol over water in these ZIFs have also been investigated. The following conclusions are obtained: (1) the order of the adsorbed amounts of ethanol is ZIF-9>-7>-3>-1 at the same condition. And there are the same trend for water adsorption. (2) ZIF-1 and -3 have preferable selectivity of ethanol over water than ZIF-7 and ZIF-9 owing to the hydrophobic structure of the former.
Dynamic Compensation Control Strategy of PFC Based on Real-time Calculation of Performance Index
Authors: Li Jun , Gao Song , Wang Tao , Sun MengMeng , Lei WenTao 
Published: December 2019

Abstract
The primary frequency control(PFC) performance of thermal power units were affected by the problems such as equipment delay, nonlinear valve flow characteristic curve and weak controller parameters etc. Combined with the new integral electricity contribution index method, one dynamic compensation adjustment method of PFC based on real-time evaluation of performance indexes are proposed. The method dynamically adjust the control parameter by calculating the amplitude of PFC at the relevant time and the integral electricity contribution in the corresponding time period. This method not only improves the PFC performance based on the safe operation of the unit, but also helps to improve the PFC performance. It satisfies the power grid’s standard and reduces the frequency fluctuation of the grid system.
Influence of Pollution Degree on Impact Flashover Characteristics of Insulator
Authors: Chao Yafeng , Zhang Liu , Wang Cheng , Huang Fuyong , Duan Jianjia , Yue Yishi , Liu Sanwei 
Published: December 2019

Abstract
The flashover characteristics of polluted insulators under lightning impulse and switching impulse are simulated in laboratory. It is found that when the gray density value is fixed, the flashover voltage begins to saturate under the shielding failure voltage while the salt density value reaches 0.1∼0.15mg/cm2 And the salt density saturation point under the counterattack voltage waveform is earlier than that under the counterattack voltage waveform, around 0.02mg/cm2. When the gray density value is fixed, under the counterattack voltage waveform, the flashover voltage decreases slightly in the gray density of 0.05mg/cm2 to 0.10 mg/cm2 range, and the flashover voltage begins to rise with the increase of gray density. Under the shielding failure waveform, the flashover voltage always decreases in the gray density of 0.05mg/cm2 to 0.20mg/cm2range, and begins to rise gradually after the gray density exceeds 0.20mg/cm2.
The Auxiliary Electrode Can Improve the Electric Field Distribution of the Roller Electrostatic Spinning
Authors: Hao Shi , Pingjuan Niu , Pingfan Ning 
Published: December 2019

Abstract
Although needle-free roller electrostatic spinning technology has the advantages of higher output than traditional needle electrostatic spinning, it has the problem of uneven distribution of electric field and poor quality of filaments. The emphasis of this study is to solve the non-uniform distribution of the electric field of roller electrostatic spinning so that it can produce high-quality nanofibers. The electric field analysis shows that the electric field distribution is most uniform when (1) ring electrode is connected to 5kv and parallel electrode is connected to 11kv, and (2) auxiliary electrode is connected to -700v. The finite element analysis of the electric field shows that the auxiliary electrode increases the electric field intensity in the spinneret area. The auxiliary electrode in needleless roller electrostatic spinning technology can be used to develop high efficiency and low energy consumption nano-fiber production system.
Passive House Techniques in Retrofit of Conventional Buildings in Northeastern Coastal Regions of China
Authors: Wang Daohua 
Published: December 2019

Abstract
Passive houses provide a comfortable and healthy indoor living environment with low energy consumption and low extra building costs, especially suitable for China with huge population and strong economic growth, so this paper aims to study guidelines and the application of passive house techniques to retrofit conventional buildings in the northeastern coastal regions of China. The key points of design techniques including retrofit of exterior walls, roofs, exterior windows and doors, and natural ventilation are discussed in detail. In the end, this paper looks to the future development of passive houses in China.
Research on comprehensive optimization of engineering project based on non-radial super-efficiency DEA
Authors: Liu Yan , Wang Xiaowen , Ji Yingbo 
Published: December 2019

Abstract
Duration, cost and quality are three important main indexes to measure the comprehensive benefit of the construction engineering project, the comprehensive equilibrium optimization of which is great of significance. With simple process and clear results, non-radial super-efficiency DEA is an algorithm for studying the input and output, which considers the resource constraints and decision-maker preferences. By introducing this algorithm into the field of comprehensive optimization of engineering project, the multi-objective comprehensive optimization model of quality, cost and duration is established and the solution is obtained by using non-radial super-efficiency DEA model, thus completing the order of different construction schemes and realizing comprehensive optimization of engineering projects. Finally, through one application example, the solution is obtained by using LINGO software, which has proved the effectiveness of the optimization method and provided support to the decision-making of the project.
Experimental research on bearing capacity of special anchor
Authors: Feng Shaojie , Hu Hang , Sun Shiguo 
Published: December 2019

Abstract
The bearing capacity of anchor can be greatly improved by adding anchor gills on the basis of traditional anchor. Taking the smaller particle pea stone concrete as anchoring cartridge, this paper conducted the bearing capacity pull-out test on special anchor with additional anchor gills and studied the relationship between bearing capacity of special anchor and layers of anchor gills, strength of pea stone concrete, the size of the block. The test results have revealed that adding anchor gills in anchoring section has an obvious effect on improving the bearing capacity of anchor and the bearing capacity of single-layer rod is 1.2 times - 1.7 times that of finishing rod. There is a non-linear relationship between the bearing capacity of special anchor and the strength of pea stone concrete when the strength of anchor gill is constant. However, as the concrete strength increases, the improvement of bearing capacity becomes smaller. Under the condition of single-layer rod, the bearing capacity of anchor increases with the increase of the size of the block, which shows that the bearing capacity of anchor is positively correlated with the thickness of concrete when the strength of anchor is constant.
Analysis of the vortex characteristics during roadway ventilation
Authors: Qi Yipei , Yang Fan , Zhao Hengze , Wang Fusheng 
Published: December 2019

Abstract
The ventilation in the roadway is in a turbulent state. As the main body of the ventilation, the vortex rotating produces energy dissipation under viscous force which in turn creates air resistance, and it plays an important role in heat and mass transfer. Considering the importance of the vortex in the roadway ventilation, a series of analyses were made by the Taylor model from the perspective of microscopic to explore the vortex characteristics based on the theory of viscous fluid mechanics and vortex motion. The phenomenon that the radii was increasing as vortex diffusing to the roadway center and the energy dissipation was the biggest near the wall was verified. The survival period of vortex was clarified which has an important effect on analyzing the formation of the turbulence. The paper also established the model of energy dissipation rate unit volume which is helpful to the theory of roadway ventilation. In the final, a proposal was offered that it was better to avoid small scale vortex in the roadway ventilation.
Research on TFP change and convergence of China’s regional real estate industry
Authors: Xu Houan , Liu Xinnan 
Published: December 2019

Abstract
The added value method is used to screen the input and output indicators of the real estate industry. The DEA-Malquist method was used to measure the total factor productivity (TFP) of the real estate industry in China’s 30 provinces from 2006 to 2017. Further, the convergence test of the real estate industry TFP in eastern, central and western China was conducted. It was found that the average growth rate of real estate industry TFP in China’s 30 provinces during the period was 3.3%. Technical efficiency was the main driving force for TFP growth, and the contribution of technological progress was relatively small. In the improvement of technical efficiency, pure technical efficiency is obviously improved, and the improvement of scale efficiency is limited. The absolute β convergence test was carried out. From the national perspective, the TFP gap in the real estate industry in each province has a significant narrowing trend; In terms of regions, the TFP gap in the real estate industry in the eastern provinces has a narrowing trend, but it is not significant; The growth of TFP in the real estate industry in the central region has a significant catch-up characteristic, and the TFP gap between provinces has gradually narrowed; The TFP gap in the real estate industry in the western provinces has significantly expanded.
Comparison on seismic response of rectangular closed diaphragm wall and pile group in sloping liquefiable deposit
Authors: Zhang J L , Cheng Q G , Li Y , Wang C 
Published: December 2019

Abstract
This paper presents fully coupled solid-fluid nonlinear dynamic finite element (FE) model on OpenSees platform to study the response of rectangular closed diaphragm wall (RCDW) subjected to earthquakes. Soil seismic behavior was simulated by the PDMY02 soil model available in OpenSees and soil-RCDW interaction was captured by the zero length elements with PyLiq1, TzLiq1 and QzSimple1materials. Then, the FE numerical model was validated by data measured from centrifuge experiments. The validated numerical model was used to investigate the different seismic response between RCDW and pile group in sloping liquefiable deposit. The numerical simulation results showed that: a) Compared with pile group, RCDW can mitigate liquefaction in soil core subjected to earthquakes; b) RCDW was able to resist soil lateral spreading more effectively; c) The shear strain of soil core was restrain by RCDW which resulted in slow generation of excess pore water pressure. Therefore, RCDW had the advantage of liquefaction mitigation; d) Pile group had more deformation displacement, RCDW had more rigid displacement, resulted from the different stiffness and structural integrity between RCDW and pile group; e) Finally, it can be concluded that RCDW may be more suitable choice applied in the sloping liquefiable ground.
Structural characteristics of oak plantation in Danjiangkou reservoir area
Authors: En Liu , Chunqian Jiang , Xudong Zhang , Lianghua Qi , Lei Zhang , Zengwang Yao , Hui Wang , Yanfeng Bai 
Published: December 2019

Abstract
In this paper, the frequency distribution of DBH and DBH of oak plantation was simulated by using normal distribution, and the relationship between DBH and tree height, DBH and crown area was fitted by 11 common curve models. The relation between DBH and tree height was well simulated by S model and cubic curve model. The relationship between DBH and crown area was simulated by cubic and quadratic models.
Geometric Construction and Static Analysis on Timber-Arched Structural System of Shouning Timber-Arched Lounge Bridge
Authors: Deng Hua , Yang Shunli 
Published: December 2019

Abstract
Due to the disrepair, many timber-arched lounge bridges have structural safety hazards and require protection. This paper analyzed the structural composition as well as the composition principle of of Shouning timber-arched lounge bridge. It is found that the timber-arched bridge structure belongs to highly indeterminate. The ANSYS finite element simulation analysis of timber-arched lounge bridge shows that three-node and five-node seedlings are the components which are mainly subjected to axial force. Their shear stress is only 12% of the axial stress. Three-node and five-node seedlings make full use of the tensile and compressive properties of wood. At the same time, the portal framed bent, horse leg also play an important part in the structure. The double bridging is the important component to guarantee the wind resistance, earthquake resistance and transverse stability of bridges. The results of this paper have academic guidance meaning for the maintenance and reinforcement of timber-arched lounge bridge.
Wind Farm Harmonic Impedance Estimation Based on Stochastic Subspace Method
Authors: Jiao Chunlei , zhi Zhao Pu , bing Hou , Zhen Wang , Yongjun Cai 
Published: December 2019

Abstract
Wind farm harmonic impedance is important parameter of wind farm. It has an important influence on stability calculation, stability analysis and stability assessment. To solve this problem that wind farm harmonic impedance is considered as static parameter, an assessment method of wind farm harmonic impedance based on output-error model parameter estimation is proposed. A simplified treatment for the wind farm PCC model is made. The simplified model is transformed into two-node equivalent model. And then the amplitude-frequency characteristic of wind farm harmonic impedance is gained by using the output-error model parameter estimation. The simulation result and outdoor test result illustrate the effectiveness of the proposed method. The proposed method takes a new direction with model identification and system analysis of wind farm harmonic impedance.
Influence of Excavation of Loess Tunnel on Stability of Adjacent Existing Tunnels
Authors: Qianqian Zhen , Shuchen Li , Guangshun Zheng , Xianda Feng , Zhaoming Chi 
Published: December 2019

Abstract
This study investigates a project for new railway tunnels constructed adjacent to existing tunnels in the Loess Plateau region of Taiyuan, Shanxi Province, China. A comprehensive empirical evaluation method and three-dimensional Lagrangian numerical simulation were used to analyze the effects of newly built tunnels on the stability of existing tunnels. Research conclusions are listed as follows. Empirical evaluation method is used to study the construction of the newly built tunnel, which is located within the restricted range of the two existing tunnels and the caution range. When the newly built tunnel is within the restricted range of the existing tunnel, the smaller the distance between the two tunnels, the greater the influence on the deformation of the existing tunnel. When the newly built tunnel is located within the caution range of the existing tunnel, the tunnel contains maximum disturbance in the middle of the axis of the existing tunnel. The results provide a reference for future research on similar adjacent construction.
Buckling of Rock-Socketed Piles Embedded in Soft Soils
Authors: Shao Xianfeng , Chen Ximing , Liu Junxiu 
Published: December 2019

AbstractBuckling of rock-socketed piles embedded in soft soils is intensively explored by utilizing three dimensional Finite-Element model in this paper. For pile-soil systems with a wide range of values of geometric parameters and material properties, the critical buckling load and buckling mode are obtained, and compared with the results based on Winkler foundation model. The simulation results show that the exact critical buckling load is a little bigger than that based on Winkler foundation model. The effect of rock-socketed ratio on the critical buckling load with three types of constrains is also investigated. With increasing rock-socketed ratio, the critical buckling load increases dramatically. The obtained results are useful to optimize the design of the pile-soil system against buckling in geoengineering applications.
Mechanical behavior evaluation of corrugated steel webs (CSWs) multi-cell PC box girders
Authors: Chen Yitu , Zheng Zhiren , Xu Jing , Ding Yong 
Published: December 2019

Abstract
In order to optimize the design of the girder bridge, based on the CSWs PC box girders bridge design parameter, the mechanical behavior of single-room girder boxes from the single cell to five cells under four different load combinations were analyzed by using the FEA. The mid-span displacement in the bottom flange, Von-mises shear stress in both corrugated web sides, normal warping stress and dead weight of the box girder were obtained. Calculation results have shown that multiplying cell numbers could increase the efficiency of prestressing and decrease the Von-mises shear stress in both corrugated web sides in some cases. However, with the cell numbers increasing, the normal warping stress under eccentric load and the dead weight of the girder increase dramatically. Finally, by utilizing the Simple Formula Method and Principal Component Analysis Method, the proper cell number for the box girder of the specified size is suggested.
Parametric Design and Application of Assembled Steel Plate Composite Beam Bridge Based on BIM Technology
Authors: Hui Wei , Xu Hanzheng , Li Zhifeng , Ma Chaofan 
Published: December 2019

Abstract
This paper combines Building information model (BIM) technology with assembled steel composite beams, carries out parametric design and Deepening Application in Revit software, optimizes BIM technology with other software, proposes parametric design process based on Revit as three-dimensional core modeling software, and carries out virtual analysis of bridge real environment. The BIM information classification and coding of the components of the assembled composite girder bridge lay the foundation for the establishment of BIM information model. Based on Dynamo visual programming, the input efficiency of information integration is improved by batch input of parameter information values. Based on the BIM model and Abaqus finite element software, the stability of the 2×5 m prefabricated pier is verified and analyzed.