bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the influence of flat plates for stiffening on the force transmission of frame cross bracing
Authors: Mei Dafang , Li Ming 
Published: February 2021

Abstract
The main girders of the I-section steel-concrete composite twin girder bridge is usually connected together by frame cross bracing. When the cross girder is connected with the main girders by welding, the flat plates for stiffening can be used to strengthen the connection to ensure the effective transfer of connection forces between the two. In this paper, the finite element simulation method is used to study the influence of flat plates. The results show that, compared with the twin girder structure without flat plates for stiffening, when the same load acts on the cross girder: the stress peak value of the cross girder of the twin girder structure with flat plates is obviously reduced, and the stress peak value of the main girders is increased; the bending stress of the web of T-shaped connection stiffeners diffuses faster from the welding part to the end; the peak value of the axial stress on the web of T-shaped connection stiffeners decreases obviously, and the position of the peak value changes from the side near the cross girder to the side near the web of main girder. The above results show that it is necessary to set the flat plates for stiffening in the twin girder bridge to ensure the transfer of forces between the main girders and cross girder.
A calculation method of precise direct normal irradiance based on measured CSR
Authors: Niu Yisen , Wu Zhaoxuan , Zhang Kexin , Song Jifeng 
Published: February 2021

Abstract
Radiation from the circumsolar region called circumsolar radiation is part of direct solar radiation, but not all circumsolar radiation can be received by concentrating solar power (CSP). Circumsolar ratio (CSR) reflects the proportion of circumsolar normal irradiance in direct normal irradiance (DNI). CSR is related to the radial distribution of solar brightness (sunshape) and it is influenced by atmospheric turbidity and air mass (AM).Performance of CSP is affected by CSR, which should be considered in the CSP simulation and analysis. This work introduces a method of measuring CSR with a CCD camera and filters. Also a calculation method of DNI for different field of view based on the measured CSR is proposed.
Study on Effect of High Voltage Pulse Electrode Spacing on Broken Concrete Physical Performance
Authors: Yan Zhang , Yin Yushi 
Published: February 2021

Abstract
In order to study on effect of high voltage pulse electrode spacing on broken concrete physical performance, through four electrode spacing in the concrete crush test, analysis of electrode spacing effect on water absorption and loss rate of aggregate, particle size distribution, crushing value and surface roughness. The test results show that after concrete crushed by the pulse, crushed aggregate mainly assumes three kinds of apparent form; With the electrode spacing increasing, concrete crushing grain group present diversity, continuous graded aggregate gradually formed; The water absorption rate of large particle size assumes the albeit slowly trend compared the small one, on the whole, within 1 hour, aggregate absorbent ability quickly reach the maximum, grain group for 5-20 mm and 16-31.5 mm compare 0.16 hours increased by 25.53% and 12.86% respectively, to 24 hours, only increased by 18.82% and 3.02% compared the early time(one hour)condition respectively; For water loss, large and small particle size both show the increase trend; The aggregate particle size mass within the scope shows the tendency of increase after the first reduce overall.
Enhancement of impact resistance of CVD diamond coating by multilayer strategy
Authors: Zhou Fan , Chen Naichao , Chen Shuai , Wei Kun , He Ping , Liu Dongmei , Ju Fasong 
Published: February 2021

Abstract
Poor impact resistance of diamond coating has limited its wide application. In this work, a experimental analysis was conducted to explore the effect of multilayer strategy on impact behaviour of diamond coating. Multilayer diamond coating facilitated the enhancement of impact resistance. Thereafter, four types of chemical vapor deposition coating were deposited to further verify the impact resistance of multilayer diamond coating. Scanning electron microscopy, Raman spectrometer and X-ray diffraction equipment were used to characterize the diamond coatings before and after the impact, respectively. The results showed that MCD/NCD coating had the smallest impact scar. Furthermore, it could be concluded that the multilayer strategy was beneficial for coating to improve the impact resistance.
Test research on mechanical properties of engineered cementitious composites
Authors: Wang Shuaiyu , Du Hongxiu , Lv Jingjing , Guo Jun , Yue Guoyang , Ma Jie 
Published: February 2021

Abstract
Taking engineered cementitious composites(ECC) as the research object, the effects of sand particle size(A), total fiber volume content(B) and fiber types(C)(single, double or triple blending)on the flexural strength, compressive strength and tensile strength of ECC were studied by orthogonal test. The results show that the total fiber volume content has the greatest influence on the three mechanical properties of ECC, and the three mechanical properties are improved with the increase of total fiber volume content. Followed by the influence of fiber types, the flexural and compressive strength of single doped PVA is higher than single doped PP and the two mixed, steel fiber can improve the flexural and tensile strength. The influence of sand particle size on the three mechanical properties of ECC is the least. After comprehensive consideration, in the range considered in this study, the optimal scheme is 600 μm grain size, 2% fiber volume content and triple blending(PP0.5%+PVA1%+S0.5%).
Simulation research on microscopic remaining oil distribution in high water cut oilfield
Authors: Pan Shaowei , Wang Zhaoyang , Luo Haining 
Published: February 2021

Abstract
Most of the oilfields in China have entered the stage of high water cut nowadays, and it is very difficult to enhance oil recovery in these oilfields. In this paper, combined with the image processing technology, the visualization technology of 3D data field and the seepage mechanics theory, a simulation model on microscopic remaining oil distribution has been constructed. After that, the remaining oil distribution of a high water cut oilfield in south China in three different microscopic pore throat networks, namely big pore and coarse throat, medium pore and medium throat and small pore and fine throat, was simulated. Through the simulation results, the conclusions are drawn: compared with the small pore and fine throat network, the development resistance of oil in the big pore and coarse throat network and the medium pore and medium throat network is smaller under the same water-flooding development conditions; compared with the big pore and coarse throat network, the development resistance of oil in the medium pore and medium throat network is larger, which leads to more remaining oil left. The simulation on microscopic remaining oil distribution is of great significance for enhancing oil recovery in high water cut oilfields of China.
Study on aerobic corrosion characteristics of gas injection pipe wall in oil field under dry / wet interaction condition
Authors: Cheng T. , Dang Y.B. , Hu F.T. , Jia Z.W. , Niu Z. , Hu B. , Zhang H.L. 
Published: February 2021

Abstract
By studying the corrosion behavior of oilfield pipelines in different oxygen content and corrosive medium under simulated ambient air/air foam flooding environment, the dry/wet interaction between the surface and the interface of the service casing is caused by the air displacement/air foam flooding, which greatly aggravates the aerobic corrosion process. The corrosion process changed from localized corrosion to uniform corrosion with the increase in dry and wet cycles. Pitting corrosion occurs in the early stages of dry and wet cycles, and the increase in chloride concentration and oxygen content will accelerate the initiation and development of pitting.
The change characteristics of dissolved copper in water of the Hun River, China
Authors: Zhang Kan , Li Haifu , Lan Tianhui , Su Fangli 
Published: February 2021

Abstract
The concentrations of dissolved copper in water of the Hun River were investigated to research the change characteristics of dissolved copper. We established the dynamic concentration function about time and spatial coordinate and convection diffusion equation of dissolved copper to obtain the distribution and accumulation characteristics of dissolved copper in the Hun River. In addition, we analyzed the advantages and disadvantages of two types of concentration functions of dissolved copper and used their own advantages to research the distribution and accumulation characteristics of dissolved copper in the Hun River. The results revealed the sources of copper pollution in water of the Hun River and provided theory basis to control copper pollution along the Hun River basin.
The compilation of material consumption quota of coal enterprises based on operation
Authors: Jia Shun , Wang Haiyang , Cao Cheng 
Published: February 2021

Abstract
In the entire production and processing process of coal products, material consumption accounts for the largest part of the cost. For the management of material cost, the process of preparing the cost budget based on the job is the process of setting the rated price. The preparation of job-based material consumption quotas is to reflect the occupation and consumption of materials in the job process to the amount and value of the job. Traditional coal enterprise material consumption budgeting is based on material consumption in the production process as the starting point for budgeting, without considering the real motivation of material consumption. This paper studies the distribution of the number of picks consumed by the two fully mechanized mining teams under the same working face to form a operation quota.
Study on the synthesis of modified materials and their adsorption performance on heavy metal ions from aqueous solution
Authors: Zeng Jian , Chen Yaozong , Chen Fang , Liu Mengfei , Gan Min , Zhu Jianyu 
Published: February 2021

Abstract
In this work, the schwertmannite modified by different divalent cations were successfully prepared and used for the adsorption of Cr(VI) and Cu(II) from aqueous solutions. The characterization was measured by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR). FTIR results show that the doping of Mg2+ and Mn2+ significantly increased the content of hydroxyl group. Moreover, the adsorption kinetic study illustrated that chemisorption mainly controlled the Cr(VI) and Cu(II) removal process. Therefore, schwertmannite modified by doping with divalent cations could be a potential adsorbent for the remediation of Cr(VI) and Cu(II) containing wastewater.
Research on performance of mine dehumidification and cooling system based on heat pump
Authors: Guo Zhenxing , Miao Dejun , Kong Lingxiao 
Published: February 2021

Abstract
A heat pump-based mine solution dehumidification and cooling system is used in deep mines, which can not only reduce the temperature and humidity of the working face, but also recycle the low-grade heat energy and improve the utilization rate of energy.Under the condition of long distance air supply, within the range of 10m from the heading face, the equivalent temperature of the air can fall to 24.7 °C, the cooling range is 5.6 °C, and the relative humidity decreases by 23.79%. Compared with the original cooling system, the COP value of the system can reach 3.43 under the same working conditions, 19% higher than the original cooling equipment.
Numerical Study on Heating Process of High Viscosity Crude Oil in Oil Tank of Sunken Ship
Authors: Shuai Yang , Wen-feng Wu , Jia Liu , Yong-yan Chen , Xu-xiu Wang 
Published: February 2021

Abstract
This article assumes that the crude oil in the oil tank of the sunken ship is completely solidified, has high viscosity, and loses fluidity before heating. Based on ANSYS software, a three-dimensional numerical model of the sunken oil tank was constructed, and the numerical study of the heating process of high-viscosity crude oil in the sunken oil tank was carried out. According to the theory of heat transfer, the changes in the solid-liquid interface and the flow characteristics of the oil during the heating process of high-viscosity crude oil are analyzed to obtain the heat transfer characteristics during the heating process. Studies have shown that the heat transfer method at the initial stage of heating is mainly heat conduction, as the highly viscous crude oil continues to melt, the influence of natural convection gradually strengthens. This research can provide relevant theoretical basis for the underwater oil pumping work of salvaging sunken ships.
Study on the Preparation of Novel Fe-Mn Composite and its Performance on Chromium (VI) Removal from Aqueous Solution
Authors: Chen Yaozong , Gan Min , He Peng , Zhu Jianyu 
Published: February 2021

Abstract
In this work, a novel Fe-Mn composite (PR) was prepared and used to efficient remove Cr(VI) from aqueous solution. SEM analysis shows the obvious surface structure change after Cr(VI) treatment. The PR composite has a wide pH range of application. Moreover, the pseudo-second-order model and Langmuir isotherm model described well with the experimental data. The maximum adsorption capacity was 36.64 mg/g (pH = 6, 30 °C). Both humic acids and ionic strength did not have significant effect on Cr(VI) removal by PR composite. Therefore, PR composite could be a potential adsorbent for the remediation of Cr(VI) containing wastewater.
Study on the Removal Efficiency of Pollutants by Electrochemical Oxidation
Authors: Geng Yan , Yan Tingchun , Wang Manning , Huang Yaqi , Liu Guodong , Quan Yue 
Published: February 2021

Abstract
In this study, magnetic field and electrochemistry were combined to treat Rhodamine B (RB) wastewater. This paper discussed the influence of electrolysis time, voltage, electrolyte type, electrolyte concentration and electrode material on the decolorization rate of RB. Under the optimum condition (100.0 mg/L concentration, electrode distance 3.0 cm, magnetic field intensity 20.0 mT, voltage 7.0 V, titanium as anode material, 0.1 mol/L KCl electrolyte), the decolorization rate reached 99.32% after 40 min.
Decision Analysis of Spent Power Battery Recovery Mode under Hybrid Dual-Channel Collection
Authors: Liang Xuedong , Yao Bangyi , Ye Meng , Wang Yaqi , Li Ziyang 
Published: February 2021

AbstractRecycling spent power battery is an important measure to alleviate energy shortage and environmental pollution. However, at present, there is no uniform standard for the recycling channels of spent power battery, and the construction of recycling channels of various recycling subjects is chaotic, and the mode with the highest efficiency is still inconclusive. Therefore, based on the current situation of spent power battery recycling, combined with the closed-loop supply chain channel decision-making theory, this paper studies three hybrid dual-channel recycling modes, compares and analyses the recycling rate and profit under different modes, and finally discusses the influence of different factors and recycling modes through numerical analysis. The results show that: (1) The hybrid dual-channel recycling mode of automobile alliance and third-party recycler can bring the maximum recovery rate and profit. (2) The competition between different recycling channels can not only improve the recovery rate, but will lead to the decline of the recovery rate and profit, resulting in a double loss situation. (3) Centralized decision-making brought about by cooperation can improve the total recovery rate and the total channel profit.
Potentiometric Titration Analysis of Triethylamine and Xylidine Based on Smooth Derivation of Savitzky-Golay
Authors: Jie Liu , Zhulin Yu , Wei Li 
Published: February 2021

Abstract
The titration curve is not obvious during the potentiometric titration analysis of the sample containing xylidine, and there is interference noise. The Savitzky-Golay smoothing method is used to eliminate the local noise effect in the titration curve, and the first-order derivation curve is obtained. The method performs polynomial fitting and derivation on each data point in the titration curve by aliquoting the moving window, and obtains the most effective information while eliminating noise. According to the standard sample measurement result error optimization window width and polynomial fitting times, the titration curve is smoothed by five points to obtain the ideal measurement result. The analysis of the actual sample shows that the smooth derivation method can more accurately detect the titration end point of the titration curve, and is simpler, faster and more reliable than the mapping method.
Study on Gas Occurrence Law in Xigou Coal Mine
Authors: Li Chengyu , Zhang Lili 
Published: February 2021

Abstract
The factors affecting the gas content occurrence and accumulation are quite complicated, in this paper, the gas occurrence law of Xigou Coal Mine is studied from the aspects of coal seam metamorphism, coal seam thickness, geological structure, surrounding rock lithology, burial depth and hydrogeological conditions, it provides guidance for safety production and gas development and utilization in later period.
Oil shale in situ conversion with catalyzing by mineral-based solid acids
Authors: Meng Xianglong , Qi Zhilei , Yu Cong , Song Ranran , Bian Junjie , Ma Zhongliang , Long Qiulian , Su Jianzheng 
Published: February 2021

AbstractThis study aims to explore the effect of mineral-based solid acids catalyst on oil recovery from oil shale. Kaolin/SBA-15 and clin/SBA-15 catalysts were prepared from kaolin and clinoptilolite, respectively, and used for in-situ catalytic conversion of oil shale and hydrocarbon generation transformation of kerogen. Carbon number and boiling range analysis were performed on the catalytic conversion products of oil shale under the condition of 300 °C. GC/MS analysis showed that the main products of catalytic conversion were alkanes and cycloalkanes, ranging from 6 to 10 carbons in length. The boiling range was more distributed between 170 °C and 250 °C, and no reduced pressure gas oil and residue oil with boiling range above 350 °C appeared. The product analysis and element analysis of the oil shale catalytic conversion show that the conversion effect of kaolin/SBA-15 and clin/SBA-15 with and without catalyst is not different. In the process of kerogen hydrocarbon generation transformation, the carbon number is distributed between 9 and 15 carbons. After the addition of kaolin/SBA-15 and clin/SBA-15 catalysts, the content of C5-C11increased by 14.85% and 11.66%, respectively; the content of C12-C20decreased by 14.85% and 11.66%, and the selectivity of C9increased to 50.47% and 42.66%, respectively. The boiling range was concentrated between 70 °C -250 °C, and the contents of naphtha in the transformed products after adding catalyst were 54.99% and 34.76%, respectively, and the contents of the middle distillate were 34.33% and 30.62%, respectively. Kaolin was the abundant mineral in the shale. It provided a feasible approach for in situ preparation of kaolin/SBA-15 catalyst underground.
Research on key techniques of tissue culture of Qinghai Rhubarb
Authors: Zhang Xiaohui , Shi Binli , Qiu Jiang 
Published: February 2021

Abstract

Rheum palmatum L. is a perennial herb of the Rheum genus Polygonaceae. It is a traditional Chinese herbal medicine which has extremely high medicinal value. Rhubarb has scarce seeds in subtropical regions, and natural planting conditions have limitations. In recent years, the demand of rhubarb has increased, and the means of sowing and raising seedlings can no longer meet the needs of the market. Traditional sowing and propagation methods have limitations such as long cycle and low reproduction coefficient. Tissue culture technology can shorten the reproduction cycle that increase the reproduction coefficient and maintain the excellent characteristics of the parents, which is an effective way to promote the large-scale and commercial production of fine varieties of rhubarb. The results of the study showed that: (1) Analysis of the characteristics of Qinghai Rhubarb seeds. (2) Seed sterilization treatment. (3) Primary culture medium selection. (4) Callus induction. (5) Callus proliferation culture. (6) Hypocotyl callus bud differentiation.(7)Rooting culture. (8) Qinghai Rhubarb tissue culture seedling transplantation. Using the method of the present invention to establish a Qinghai Rhubarb in vitro culture aseptic propagation system, high-quality Qinghai Rhubarb seeds as explants and different hormone medium ratios, Qinghai Rhubarb hypocotyl induction rate reached 90%, and the proliferation coefficient reached 4.3. The survival rate of transplanting tissue cultured seedlings reaches 95% which can improve the reproduction efficiency of Qinghai Rhubarb, and provide theoretical basis and technical support for subsequent research on transgenic and genetic improvement. It can also provide a basis for medicinal value for the systematic research and commercial production of Qinghai Rhubarb.
Design of Optimal Scheme for Industrial Network Monitoring of Ocean Energy Power Generation System
Authors: Kang Wang , Xiwu Gong 
Published: February 2021

Abstract
In recent years, with the development of ocean energy power generation technology, the monitoring technology of ocean energy distributed micro-grid power generation system is also advancing with the times. This paper proposes an optimization solution for the industrial network monitoring of the ocean energy power generation system composed of HMI, PLCs, distributed I/O, etc., in order to better adapt to the complex and changeable harsh environment of ocean energy power plant, provide real-time and accurate data for subsequent fault diagnosis of the power generation system. It mainly realizes the functions of microgrid system status detection, fault alarm, and real-time display of electrical parameters of the system during power generation. The test simulation results show that the design realizes the intelligent monitoring of real-time parameters of the power generation process.
Mixed Game Theory Based Coordinated Development and Planning of Wind Power, Thermal Power and Grid
Authors: Zheng Yun-fei , Wang Yin-xiang , Jing Lin , Lei He , Yang Dong-jun , Fang Reng-cun , Zhou Si-xuan , Sang Zi-xia 
Published: February 2021

Abstract
In order to reduce the investment waste caused by independent planning of wind power, thermal power and power grid in high penetration wind power system, and promote wind power consumption, a new hybrid game planning method for wind fire power grid is proposed. Firstly, combined with renewable energy quota system and green certificate trading mechanism, the game relationship of generation network under high penetration rate is analyzed. Then, a two-stage planning model including master-slave game between network sources and cooperative game of wind power generation is established with grid expansion scheme and wind power capacity as decision variables, and a profit distribution method considering economic and environmental gains of both partners is proposed.