bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical Study on Modified Serpentine Flow Fields Effect on Characteristics of PEMFC Water and Gas Transportation
Authors: Yan Hanzhang , Quan Wenxiang , Du Jianrong , Li Huizi , Wan Zhongmin , Chen Xi , Huang Taiming , Zhang Yan 
Published: April 2020

Abstract
The mass transport properties of fuel cells mainly determined by the flow field structure. Therefore, it is an effective method to improve the running condition and performance of the cell by improving the flow field structure. In this paper, a modified serpentine channel with gradient channel depth and trapezoidal section shape is proposed. The new flow field and the traditional serpentine flow field are solved numerically, the numerical results reveals that compared with the other one the new flow field have a more uniform concentration of reactants, and the water generation in the reflection area is lower due to the high channel pressure. Through the optimizing the flow field the fuel cell have a 23% performance improvement.
Characteristics and Optimization of Anaerobic Digestion of Tea Waste for Biogas Production
Authors: Zhang Huijun , Xiong Xuanrui , Zhou Jieya , Huang Yunzhu 
Published: April 2020

Abstract
The tea residue from the production of beverage tea is used as anaerobic fermentation biogas production material. The anaerobic fermentation biogas-production experiment is conducted at an intermediate temperature of 35°C, and the biogas potential of the tea residue is reviewed. Using orthogonal experiment method, the effects of temperature, moisture and inoculation rate on the degradation property of tea residue are studied by designing L9 (33) experiment with 3 factors and 3 levels. The primary and secondary review factors and the optimum process conditions are determined. The experimental results show that: the cumulative biogas production after tea residue’s anaerobic fermentation for 40 days is 5270 ml, and the biogas production rate is 658 ml.g-1TS; methane production rate is 227.7 CH4-ml/g-ts. Orthogonal experimental results show that the optimum process conditions are 85% moisture content, 55°C for temperature, and inoculation rate is 20%. The highest TS degradation rate is 45.3%, the VS degradation rate is 61.52%.
Overview of Flow Improvers for Crude Oil Production in China
Authors: Zhang Fusheng , Shan Dalong , Liu Guoliang , Li Xuening , Sun Jianghe 
Published: April 2020

Abstract
The production of crude oil has three stages: formation drive, wellbore lifting, and pipeline transportation. This paper summarizes the application effects of flow improvers within several long-distance pipelines in China. The effects of oil- and water-soluble viscosity reducers on lower- and higher-viscosity heavy oils, respectively, and their effects in the wellbore-lifting process are outlined. Further, the technical difficulties and potential solutions associated with driving heavy oil are discussed. This paper has reference value for researchers conducting studies on flow improvers.
US New Energy Policy in the New Century
Authors: Qian Xuming 
Published: April 2020

Abstract
In the 21st century, the US government has passed a series of laws and regulations on energy, strengthening the domestic supply of energy and reducing its dependence on international energy supply. The US government uses legal instruments and fiscal and taxation levers to promote energy conservation. It vigorously develops renewable energy, researches on substitute energy, and invests on clean energy such as natural gas and nuclear energy, to create a diversified energy landscape. It has a profound impact on global new energy and its industries, international energy supply, and the world’s environmental protection industry.
Dynamic Response Prediction of Underwater Explosion Vessels
Authors: Li Linna , Hu Yanfei , Fang Chenchen , You Yue , Liu Kai , Huang Sen 
Published: April 2020

Abstract
In order to ensure the safety of the underwater explosive vessel in service, it is necessary to analyse the dynamic response of the underwater explosive vessel. The dynamic response model based on Classification and Regression Tree is established to simulate the mapping relationship between load and container strain. A reliable and stable model is obtained by cross validation. At the same time, compared with Multi-Layer Perceptron model, CART model is faster and more accurate in training, and the prediction effect is obviously better than Multi-Layer Perceptron model, which further explains the validity of CART model and provides a better method for dynamic response prediction of container.
MPPT for Single Phase Five Level Quasi-z-source Photovoltaic Inverter with Fuzzy Controller
Authors: Aziz Ismailou Abdoul , Wang Honghua , Lu Tianhang , Wang Chengliang , Shi Fan 
Published: April 2020

Abstract
The fast growth of PV system has led to the development of power electronics devices which come along with lots of challenges. One of these is the structure design including the choice of different elements involved. This paper presents an advanced off grid photovoltaic (PV) system with less components and high efficiency. The structure shows a multilevel cascaded inverter (CHB) with the advantage of less harmonics and high voltage level, quasi-z source inverter (Q-ZSI) which plays the buck/boost function for efficient operation of power electronic devices. Hence, reducing the cost and the volume of the whole system. The buck/boost operation is implemented by simple boost control (SBC) method for shoot through insertion. The pulse width modulation technique (SPWM) used is phase shift technique (PS-SPWM). This paper also compares the performance of fuzzy logic controller(FLC) with incremental conductance (Inc cond) algorithm for MPPT by focussing on their adaptability, speediness and precision despite the changes in solar irradiance. The overall system is implemented in matlab-simulink environment for simulation. Thereby confirming the feasibility and efficiency of the system.
Preliminary Result of Seismic Hydrodynamic Pressure on Bridge Pier with Submerged Depth from a Shaking Table Model Test
Authors: Liu Haiming , Tao Xiaxin , Tao Zhengru , Qin Yifang 
Published: April 2020

Abstract
To deal with the hydrodynamic pressure on bridge pier with submerged depth in water, a shaking table model test is reported in this paper. The model is designed and built for a pier of cable-stayed bridge submerged in 1.5 m water with a scale of 1/50. Two sets of motions, for E1 and E2 levels are input in two bi-directions, transverse and vertical, and longitudinal and vertical. The results show that the hydrodynamic pressure is getting larger with submerged depth obviously, with a. increasing rate larger than that for the formula in our existing design guidelines, but smaller than that by Westergaard.
HVDC Circuit Breaker Development and Applications in VSC-HVDC Transmission Project
Authors: Yang Yuefeng , Ren Menggan , Cao Junzheng , Liu Wang , Zhan Xiong , Zhao Caiping 
Published: April 2020

Abstract
High voltage direct current (HVDC), especially voltage source based HVDC (VSC-HVDC), transmission technology has been expanding in recent decades. HVDC circuit breaker therefore attracts significant interest due to its abilities of current interruption and fault isolation. This paper aims to present the technical development, specifically the topology, control and protection technology and test technology, of HVDC circuit breaker and its applications in VSC-HVDC transmission project. The project background, system configurations, and circuit breaker topology are described for each project. Based on current circuit breaker development and applications, the challenges and associated future development are also presented.
The Calculating Method of Rock Compressive Strength Based on Logging Data
Authors: Ma Yongqian , Tang Zhijun , Dong Guanghua , Shao Ru , Bi Yantao 
Published: April 2020

Abstract
Rock compressive strength was a basic lithomechanics parameter. And rock compressive strength affected the drillingability and stability of rock in drilling engineering. So a calculating method of stratum rock compressive strength was needed to raise the reliability of stratum information acquired. Then the bit selection, well design and reservoir stimulation design could be more accurate. By analyzing the experiment data of rock 3-axis compressive strength, a logging interpretation method of confining pressure has been established, and by considering the influence of confining pressure, a quantitative calculating method of rock compressive strength based on the logging data has been given. This model was used to analyz an exploration well. The results showed that the rock compressive strength was fit to the drilling time, which indicates that this model may accurately recognize the rock compressive strength in the researched area. The result also showed that confining pressure can strongly influence mechanical properties of formation rocks, so if we analyzed the rock mechanical properties, the confining pressure must be taken into account. Besides the method can calculate rock compressive strength in some old well with regular logging data only.
The Power of Short - term Load Algorithm Based on LSTM
Authors: Wang Zhankui , Wu Junying , Xin Rui , Bai Tao , Zhao Jianbin , Wei Minglei , Li Jingquan , Zhuang Lei 
Published: April 2020

Abstract
The power data is affected by many factors and has long time series, which fully meets the conditions of long-term and short-term memory neural network. This paper analyzes and models various influencing factors such as time, vacation and meteorology, and uses adaptive moment estimation optimization algorithm. The traditional optimization algorithm is improved, the generalization of the model is improved, and the short-term load forecasting of power can be stably and efficiently operated to ensure the reliability and safety of national electricity. In this paper, the short-term load forecasting experiment is carried out in a certain area of Hebei Province. The experimental results show that the proposed algorithm outperforms the existing similar model and has higher prediction accuracy.
Design on ADES Based on IFTDEPMG and its Efficiency Test
Authors: Wang Guosheng , Wang Chao , Xiao Jie , Lei Qiangshun 
Published: April 2020

Abstract
The accelerator/decelerator is the key part of the electromagnetic suspension (EMS) for it bears the function of torque changer and of speed changer synchronously. This paper introduces the scheme and working principle of electromechanical suspension for armored vehicles firstly. Then, the requirements of the accelerator/decelerator of the electromechanical suspension (ADES) are introduced according to the characteristics of armored vehicles. The accelerator/decelerator of an involute few-tooth-difference external parallel moving gear is designed, and an accelerator/decelerator prototype is tested on the bench. The results show that the accelerator/decelerator of the involute few-tooth-difference external parallel moving gear (IFTDEPMG) has high efficiency in bidirectional transmission, which satisfies the transmission requirements of electromechanical suspension in both active and passive conditions.
Energy Saving Effect of Small Water Station Motor in Enterprise
Authors: Li Hailong , Liu Shengyun , Tan Xiaodong , Xu Liyan 
Published: April 2020

Abstract
In this paper, the electric motor energy-saving transformation system of an enterprise of CNR is taken as the carrier, and the vertical centrifugal pump motor is taken as the object of energy-saving transformation. The operation of the existing working motor in the water station is investigated and the working parameters are measured and studied. The existing motor condition is transformed into energy-saving system. And the energy-saving transformation scheme, data calculation and economic benefit analysis of the whole energy-saving system are determined.
Numerical Simulation of Hydrodynamic Pressure on Bridge Pier in Water for a Model Test
Authors: Qin Yifang , Tao Xiaxin , Tao Zhengru , Liu Haiming 
Published: April 2020

Abstract
Finite element model with considering the fluid and structure interaction is built by software ADINA with the same conditions of a shaking table model test in this paper. The hydrodynamic pressures at 7 submerged depths on the water-pier interfaces, as the same positions the sensors fixed in the test, are calculated from motion inputs E1 with PGA of 0.2651g and E2 with PGA of 0.51g numerically in two direction combinations. The result shows that the pressures from the simulation and the test are close to each other, and means that the numerical procedure adopted in this paper is feasible to take into account the water-pier interaction, while the test results are also validated by the simulation.
A Centralized Transcribing System’s Design and Implementation
Authors: Yao Hao , Ye Qige , Yan Xiaoling , Jiang Dongna , Tang Zongshun 
Published: April 2020

Abstract
In order to meet the demands of collecting data of gas meter, electric energy meter and water meter, a centralized transcribing system is proposed. This system is based on EPON+LORA technology to set up the communication network, for transcribing and managing data; and design a platform that can realize data collection, data analysis, classification display, classification billing, fault classification, user management and other services.
Study on the Alloy Coatings Properties of the New Rare Earth Yttrium Zinc Aluminum Magnesium
Authors: Zhang Yue , Zhou Ziran , Tong Decheng , Ren Hengxin , Du Juan , Zhao Yaxin , Cheng Yuqing , Lin Peng , Zhao Chang , Lv Yuguang 
Published: April 2020

Abstract
Hot dip plating is a main methods of iron and steel protection, but the traditional hot dip galvanizing products can not meet the actual needs. The addition of aluminium (Al), magnesium (Mg), rare earth (Re) and other alloying elements in zinc solution has become a hot research topic. In order to obtain multicomponent alloy coating with high corrosion resistance, a new type of hot dip galvanizing coating was obtained by adding Re yttrium(Y) into Zn-Al-Mg plating bath. The influence of adding elements Re Y, Al and Mg on the corrosion resistance of hot dipped galvanized coatings was studied by conducting immersion tests, salt spray tests and electrochemical tests (Tafel, EIS), and the anticorrosion mechanism of the coatings was primarily explored. The results showed that rare earth yttrium can improve the corrosion resistance of hot dipped galvanizing, and Zn-2%Al-1%Mg-0.08%Re alloy coating has the best corrosion resistance. Hopefully, the present work uses the current hot dip galvanizing production equipment and technology, the established galvanizing technology can be applied in industry.
The Preparation of PLA/PLGA Composite Membrane and Its Application as Periodontal Barrier Membrane
Authors: Zhang Xue , Cai Xiaoqing , Zhao Haibing , Jin Zhimin , Hu Maolin 
Published: April 2020

Abstract
We synthesized high molecular weight polymer PLA (polylactic acid) and low molecular weight polymer PLGA [poly (lactic-co-glycolic acid)]. Then we prepared PLA/PLGA composite membrane by blending these two polymers, and tested various properties, such as physical, mechanical and biological properties for periodontal barrier. When PLA/PLGA = 2: 1 (w/w), degradation rate of the membrane was 63.7% within 32 weeks. The membrane showed aperture pores of 2 - 5 µm, the minimum tensile strength of 5.75MPa, and the porosity above 90%, which was beneficial to the entry of nutrients and the elimination of metabolic wastes. Under SEM (scanning electron microscope), we observed that gingival fibroblasts only grew on the positive surface, and didn’t grow on the negative side or the cross-section, indicating that the membrane played a good role of mechanical barrier.
Study of Nano Texturing on Multi-crystalline Silicon Solar Cells
Authors: Wang Shaoliang , Xu Zheng , Gou Xianfang , Huang Xixi , Zhou Su 
Published: April 2020

Abstract
Nano texturing has been confirmed as an effective structure to improve the efficiency of multi-crystalline silicon solar cells by reducing optical loss. In this study, nano textured solar cells are fabricated by the Reactive Ion Etching (RIE) method based on a conventional production line. Several characterization methods are employed to evaluate the morphology, minority carrier lifetime, quantum efficiency and electricity performance of both nano textured and micro textured solar cells. The results show that nano textured solar cell has the highest efficiency of 19.21 % and an average efficiency of 18.86%, which is 0.57 % higher than that of micro textured solar cells. Thus, the RIE method is an effective way to manufacture nano textured solar cells. It can demonstrably improve the photoelectric conversion efficiency of mass-produced solar cells and reduce the production cost, which is significant to the development of solar cell industry.
Screening of Wetting Agent for Peat Substrate and Its Effect on Cucumber Seedlings
Authors: Du Qingjie , Xiao Huaijuan , Li Juanqi , Wang Jiqing , Zhao Yueping 
Published: April 2020

Abstract
Peat is a widely used horticultural substrate, and its inherent hydrophobicity lead to inconvenience to the transportation and application of the peat substrate. In our experiment, three common wetting agent, fatty alcohol polyoxyethylene ether O-20, sodium butyl naphthalene sulfonate and sodium dodecyl benzene sulfonate were used to wet the peat. The best wetting effect on peat was obtained by fatty alcohol polyoxyethylene ether O-20. Cucumber seedling was subjected to different concentrations of fatty alcohol polyoxyethylene ether O-20 to wet the peat. We investigated the changes in emergence rate, above and below morphology and dry quality, and growth of cucumber seedlings. The results showed that the suitable concentration of fatty alcohol polyoxyethylene ether O-20 could increase the emergence rate of cucumber, the growth of hypocotyl, and root volume of seedlings. However, the stem diameter, fresh quality, underground dry weight and seedling index were not significantly different compared with control. Different concentrations of treatment had no significant effect on cucumber leaf number, maximum root length and shoot dry mass. In conclusion, the fatty alcohol polyoxyethylene ether O-20 with a concentration of 1.0 g/L is suitable for wetting the grass charcoal matrix, which has good economic and seedling effects.
Adsorption Evaluation with Zeolites for Gases in the Confined Space
Authors: Zheng Xin , Li Yao , Li Wenli , Su Zhen , Xu Jing , Li Yan , Yuan Aihua , Xu Yusong , Zhai Linzhi 
Published: April 2020

Abstract
The high humidity characteristics of the confined space challenge the zeolites with good water performance. In this study, the adsorption of N2, CO2, H2, CH4, CO and H2O vapor by zeolites (5A and 13X) were discussed, and the structure of zeolites were characterized by XRD, FTIR and SEM. The adsorption breakthrough curve of CO2 was measured by the fixed bed reactor, and the adsorption characteristics were obtained under different temperatures and gas velocities. The results showed that 13X-2 zeolite had the CO2 adsorption capacity of 100.1 cm3·g−1, which is higher than the others, and the appropriate water stability.
Study on Heat Transfer and CFD in a SCR Reservoir
Authors: Zheng Su , Hu Zejun 
Published: April 2020

Abstract
According to an industrial demand of the simulation of the heat transfer in a SCR reservoir by Plastic Omnium, we firstly developed a 3D numerical model written in C++. Subsequently, the computational performance of the model was analyzed with both laboratory and industrial experiments. Besides, it was optimized by implicating certain advanced numerical methods, for instance, a gas-liquid flow simulation based on three dimensional VOF method was implicated in order to simulate the phase change coupling sloshing condition.
Experimental and Mechanism Analysis of Chlorination and Reduction of Copper Slag
Authors: Sun Shuchen , Yu Qingchun , Deng Yong , Chen Xiumin , Chen Jing , Zhou Liang 
Published: April 2020

Abstract
Waste copper slag contains large amounts of iron. Carbothermic reduction of the copper slag to recover iron inevitably results in the co-production of copper, which causes brittleness and poses a significant cost to remove. In this work, the method of medium-temperature (MT) chlorination by sodium chloride and high-temperature (HT) reduction by carbon is used to remove copper selectively before the recovery of iron. The composition of raw materials and the products were analyzed by X-ray diffraction (XRD), and chemical analysis. It was found that excessive carbon and high temperature were unfavorable to the removal of copper from the copper slag. Cu2S and Cu can be chlorinated by sodium chloride and evaporates in the form of CuCl gas. Meanwhile, chlorination mechanism of copper slag was discussed.
Experimental Study on Inhibition of Hydrate Formation by Compound Solution of PVP and Ethylene Glycol Ether
Authors: Liu Xiaolan , Zheng Yong 
Published: April 2020

Abstract
Kinetic inhibitor is an inhibitor of many studies in the field of natural gas hydrate inhibitor in recent years. In view of the inhibition of hydrate effect is obvious, high cost, so this paper carried out several inhibitors to inhibit the formation of gas hydrate, in order to meet the need of gas hydrate inhibition, but also take the economic factor into account. It was found that the synergistic effect of PVP and ethylene glycol two ether, ethylene glycol two ether and ethylene glycol phenyl ether in the inhibition of gas hydrate, and the synergistic effect of ethylene glycol phenyl ether was the most significant.
A Study on Transverse Magnetic Wave Propagation Characteristics of Dielectric Wrapped Wire
Authors: Meng Fanbo , Li Ran , Wang Dongdong , Fu Taiyi , Zhang Tianshi , Feng Beibei , Qiu Sihai 
Published: April 2020

Abstract
The transverse magnetic wave propagation characteristics of the dielectric wrapped wires are studied. The transverse magnetic wave transmission model of a dielectric wrapped wire is revised based on the variable seperation method. The spatial relationship between electromagnetic wave emission and reflection is obtained. An experiment is developed using the new actuator and coupler. The results show that the surface wave guide formed by a single wire wrapped in a low loss medium can ben used as a high speed data transmission channel.
Research Status of Relationship between Seismic Instrument Intensity and Ground Motion Parameters
Authors: Ma Pengju , Wang Haiyun , Jiang Weiping , Zhang Xu 
Published: April 2020

Abstract
Seismic intensity can simply reflect the extent and distribution of earthquake’s impact and damage. A comprehensive and detailed assessment of intensity requires a long time and a lot of manpower and material resources. The ambiguity of the intensity assessment index and the subjectivity of the professionals often result in differences in assessment results. Seismic instrument intensity based on strong earthquake observation records can effectively avoid the above problems, and can quickly and objectively assess the impact and possible damage degree of the surface near the strong earthquake station. This paper summarizes the research progress of seismic instrument intensity and points out the development direction of seismic instrument intensity.