bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of Programable Control Electric Current Drive Based on ATmega8
Authors: Cao Yong , Zheng Yifan , Liu Yi , Wang Xiao , Hu Jinrui 
Published: October 2020

Abstract
This paper provides the design project of programmable control electric current drive based on programmable control interface used ATmega8 as core to control drive. The electric current drive adopts Buck converter to achieve input/output power conversion. The feedback loop uses voltage and current double feedback adjustment to control PWM drive circuit, so that the output of Buck converter could be adjusted. According to set value, the programmable control interface control current drive outputs the matching value by high frequency PWM output. The performance experiments is done, the results indicate that the output of programmable control electric current drive has much higher reliability and faster responding, satisfied design demand.
The Relationship between Physical and Chemical Characteristics and the Loss of Pisha Sandstones
Authors: Wu Yan , Ren Haiping , Wang Xuan , Shen Zhenzhou , Yang Zhongfang 
Published: October 2020

Abstract
Pisha Sandstones are widely distributed in the wind-water erosion intersection zone of northwestern China. In this region, serious soil and water loss has caused the riverbed of the lower Yellow River to become higher than the adjacent ground. Fifty-two samples of four types of Pisha Sandstones (purple, white, pink and gray) from different depths (0 m, 2 m and 10 m) were examined in laboratory experiments to gain a better understanding of the relationship between erosion and the loss of Pisha Sandstones as well as the mechanisms of erosion. All of the samples were analyzed using chemical methods, X-ray diffraction and scanning electron microscopy. The mineral and chemical compositions of Pisha Sandstones were found to be very different from those of ordinary soil and varies greatly during the whole erosion process (sampling depth). Wind-water erosion also affected the microstructure between the deep and surface Pisha Sandstones, ultimately causing gravitational erosion and the loss of Pisha Sandstones. Although not all of the observations could be explained, it was apparent that wind erosion, water erosion and gravitational erosion had both direct and indirect effects on the loss of Pisha Sandstones.
Manipulation of G1Ba2Cu3O7-x Film Properties by Simply Changing Growth Temperature with RF Sputtering Method
Authors: Xie Zhongzhou , Li Zhonghao , Lu Hao , Xu Jianming , Luo Xiaojing , Zhu Yanyan , Wang Ying 
Published: October 2020

Abstract
We have investigated the relationship between Jc ( the critical current density) and H (applied magnetic field magnitude) for Gd1Ba2Cu3O7-x((Gd)BCO) films grown from 750 °C to 850 °C by RF sputtering. Measurements of JC(H, θ) (the magnetic-field angular dependence of the critical current density) reveal that film B (800 °C) shows enhanced pinning compared with C (850 °C), A (750 °C) (Gd)BCO films. The film C (850 °C) is the most anisotropic. We speculate that a lot of stacking faults exist in film C (850 °C), based on a board peak along ab-plane and no peak along c axis from the Jc angular measurements together with the small anisotropy parameter γ = 3. The speculation is proved by angular dependence measurement of film C (850 °C) after high temperature process in oxygen.
Review on Application of Nanomaterials in Soil Remediation
Authors: Li Min , Luo Li 
Published: October 2020

Abstract
As to the hot research aspect of soil remediation, this review elaborated the progress in the application of nanomaterials in heavy metals and organics-contaminated soil remediation, and discussed the ecological safety of nanomaterials usage as well. The mechanism of nanomaterial-based soil remediation mainly includes adsorption, complexation, transformation, etc. The activities of nanomaterials could be enhanced by modification methods. Iron based nanoparticles such as zero-valent iron (nZVI), iron oxide and iron sulphide showed promising application prospect but also possible toxicity to soil ecosystem. However, biologically synthesized nanomaterials are more effective and safer, which has been demonstrated in many studies. Therefore, bio-nanomaterials which can not only meet the requirements of soil recovery, but also contribute to soil fertility is urgently needed.
Study on Soil Heavy Metal Contamination and Risk Estimation in Sixian
Authors: Su Haimin , He Aixai 
Published: October 2020

Abstract
At present, heavy metal contamination of soils is a extensive attention on account of the develop rapidly of urbanization and industrialization. In this paper, topsoil samples were gathered and the contents of heavy metals for example: Cd, Cr, Cu, Zn, As and Pb were determined in Sixian City. The contamination degree of heavy metals and potential ecological risk were estimated using uniparted factor contamination index, Nemero integrated contamination method, geo-accumulation index, and potential ecological risk method. The results showed: except As, mean concentrations of Pb, Zn, Cu, Cr and Cd were greater than soil background values in Sixian City. The coefficient of variation of Zn, Pb, Cu and As are greater than 30%, suggesting that they were more probably affected by human disturbance in the soil of Sixian City. The Pc values ranged between 1.46 and 26.83, displaying almost whole survey region is varying degrees contamination because of heavy metals. The Igeo
showed that the average values implied the follow contamination order: Pb > Cd > Cu > Zn > As > Cr. The most serious element is Pb. The Ei
values of Cu, Zn, As and Cr were observed in the ranges 5.66 to 21.15, 0.74 to 3.13 and 3.99 to 39.42, 1.54 to 3.57, respectively. The RI values were less than 150 with 85% light potential ecological risk and 15% moderate risk.
Study on Microstructure and Properties of 1000MPa Grade Steel Plate for Hydropower Station
Authors: Feng Lulu , Zhang Dong , Wu Kaiming , Qiao Weiwen 
Published: October 2020

Abstract
The influences of heat treatment on the microstructural and mechanical properties of 1000M hydropower station steel plate were studied. The changes in the microstructure and mechanical properties of the investigated steel at different quenching and tempering temperatures were analyzed. It was found that test steel at lower-temperature quenching was transformed into granular bainites and at high quenching temperatures were transformed into lath bainites. Moreover, With the increasing tempering temperature, the yield strength of the test steel first increased and then gradually decreased after reaching the maximum value at 630 °C, whereas the tensile strength decreased unilaterally until the tempering temperature reached 650 °C. Furthermore, the percentage elongation and the low-temperature(−40 °C) impact toughness increased significantly during tempering. Therefore, the quenching treatment was carried out 930 °C, whereas tempering temperature was selected in the range of 600–630 °C.
Study on Determination Method of Target Fishes for Ecological Flow in the main Stream of Huaihe River
Authors: Zhang Ruqiang , Wang Li , Yang Jin , Xu Guanbin , Yang Wei 
Published: October 2020

Abstract
Reasonable ecological flow based on biological indicator is crucial for river ecosystem health and restoration. Selection of biological indicator, often being the target fishes, is of great importance. Differentiating from the traditional way of choosing the rare or economic fishes as the target fishes, a more objective approach was applied in this study. Firstly, the field investigation was conducted to determine the alternative fishes range. Then, the Analytic Hierarchy Process (AHP) was employed to construct the judgment matrixes, aiming at obtaining the order weight values of the selected fishes and screening for the target fishes. This step made sure that the target fishes were representative for habitat requirement for Huaihe River. Based on fish resources data, 20 alternative fishes were selected, including 12 Cypriniformes, 3 Siluriformes, 4 Perciformes, and 1 Clupeiformes species. The results of the order weight values of the judgmental matrix showed that Parabramis pekinensis might be taken as an target fishes for calculating ecological flow because it could represent hydrological requirement for aquatic biology in the main stream of Huaihe River. This study provided a promising method for target species selection in the rivers where rare and endemic species are unavailable.
Characteristics of Green and Blue Water Flow of Hydrological Landscapes of Upper Heihe in Northwest China
Authors: Zhang Ruqiang , Wang Li 
Published: October 2020

Abstract
Blue water and green water are of great importance for food production and maintenance of ecosystem. Blue/green water flow on landscape scale and its seasonal variation remains unclear. This study attempt to analyze characteristics of green and blue water flow on landscape scale.In this study, FLEX-Topo model was adopted. And upstream of Heihe River Basin (UHB) was selected as the study area, which was divided through topographic information into four landscapes, such as riparian area, grass hillslope, forest hillslope and bare soil/rock. Based on the analysis of the simulation during the period of 1979-2015, characteristics of green and blue water flow of the four landscapes was presented. The results showed that (1) FLEX-Topo proved to be an efficient approach for catchment hydrological process simulation as well as for green and blue water study; (2) Annual green water flow(GWF) of riparian area was 325.19 mm/a while its blue water flow(BWF) was 151.92 mm/a. GWF and BWF of grass hillslope was 270.50 mm/a and 199.91 mm/a, respectively; GWF of forest hillslope was 424.75 mm/a which is much greater than its BWF (42.11mm/a);as for bare soil/rock, GWF (227.96 mm/a) was a litter smaller than BWF (295.32 mm/a). From the results, its can be concluded that:(1)on annual scale, majority of precipitation and water reserve in riparian area, grass hillslope, forest hillslope became green water flow, especially in forest hillslope. More than half of precipitation in bare soil/rock turn to blue water flow; (3) seasonal variation of both green water flow and green water flow of the four hydrological landscapes synchronized with precipitation.
Hydrodynamic Properties of High Activated y-Al2O3 in a Fixed Bed Reactor
Authors: Cao Xuejiao , Zhang Ting’an , Liu Yan , Zhang Yubin , Zhang Weiguang 
Published: October 2020

Abstract
The high activated γ-Al2O3 hydrodynamic properties in the fixed bed are studied in this paper. The factors of gas velocity and the heights of the bed on the axial bed pressure, bed pressure drop and bed voidage are studied. The results indicated that under the same height of fixed bed, the axial pressure decreased along the bed at the same gas velocity. While the pressure drop increased with the gas velocity and the bed height increased. The pressure drop has a good agreement to the Ergun equation. According to the Ergun equation, the bed voidage is regressed at different height of fixed bed. The results revealed that the bed voidage of high-activated γ-Al2O3 is almost the same in the fixed bed heights of 400 mm, 300mm and 200mm, which is 0.31, 0.32, and 0.32 respectively.
Preparation of g-C3N4/BiOBr Composites and Their Enhanced Visible-Light Photocatalytic Performance
Authors: Ren Xianming , Zhan Hao , Shen Yunxiang , Cao Chunhua 
Published: October 2020

Abstract
Novel g-C3N4/BiOBr composites were prepared successfully by a simple liquid-phase precipitation method. The morphologies and microstructures of the photocatalysts were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). With dye Rhodamine B as a model pollutant, the photocatalytic activities of the g-C3N4/BiOBr composites with various mass ratio was explored, and the possible photocatalytic mechanism was investigated briefly. The results showed that g-C3N4/BiOBr composites were formed successfully, and some fine flakes of g-C3N4 embedded in the staggered spaces and surface of BiOBr nanosheets with thickness of 50-80 nm. Compared with pure g-C3N4 and pure BiOBr, g-C3N4/BiOBr composites showed enhanced activities for both adsorption and photocatalytic decoloration of RhB. The optimum mass ratio was found to be 1:4 (g-C3N4: BiOBr) exhibiting the highest photocatalytic activity. The combination between g-C3N4 and BiOBr in composites could increase the surface area, so then improve the adsorption properties, moreover, it could contribute to separation and migration for the charge carriers. The effects of various scavengers on photocatalytic efficiency revealed that h+ played predominant role for the photo-decoloration of RhB on g-C3N4/BiOBr composites.
Optimization of Aseptic Germination System of Seeds in Soybean (Glycine max L.)
Authors: Liu Ying , Li Xiaopeng , Li Xiaohao , Liu Kaizhe , Rao Gangshun , Xue Yingbin 
Published: October 2020

Abstract
The results in the process of the optimization of aseptic germination system of seeds in soybean were found as follows. Using the method of chlorine sterilization to sterilize soybean seeds for 2-4 hours were found to get the best results and found to be suitable for the growth of soybean seeds and obtainment of the best quality explants. Relative to other varieties, the soybean variety of Mao-Dou No. 5 was found to gain the best germination effects, and the localization way of seed inoculation and the light conditions had no significant effects on the germination of seeds of Glycine max.
Substrate-dependent Growth of CH3NH3PbI3 Films Deposited by Vacuum Evaporation
Authors: Lu Ying , Han Qiang , Zhao Yuan , Yang Chenggang , Li Youzhen , Liu Xiaoliang 
Published: October 2020

Abstract
CH3NH3PbI3 (MAPbI3) films were prepared by dual-source vacuum evaporation on Au, poly(3,4-ethylenedioxythiophene) (PEDOT), and indium-tin-oxide(ITO) with the similar deposition parameters. The films were characterized with X-ray diffraction (XRD), steady-state photoluminescence (PL) and Raman spectroscopy. The interface electronic structures of co-evaporated MAPbI3 films on different substrates were studied with ultraviolet photoemission spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS). The research indicates that Au is more suitable for the film growth than the other substrates, especially when the film is very thin. The poor adsorption of the precursors may make it difficult to form MAPbI3 thin film on ITO. Furthermore, it is found that the charge transfer efficiency at the interface between PEDOT and MAPbI3 is relatively high, which indicates that PEDOT can act as an effective hole transport layer for MAPbI3-based devices.
Evaluation Method of Antiscaling Performance of Downhole Tools for ASP Flooding in Daqing Oilfield
Authors: Gao Guanglei , Xu Dekui , Ma Junzhe , Li Haicheng , Zhu Shaogong , Zhou Wanfu , Liu Chongjiang , Song Xingliang , Li Kuilong , Wang Chaoyi , Qiu Yadong , Li Jianyun 
Published: October 2020

Abstract
At present, the technology of ASP flooding in Daqing Oilfield has entered the stage of industrialization and popularization. The total number of injection wells of ASP flooding has reached more than 4000. At present, the main problem of ASP flooding layered injection wells is that after injection of ASP compound solution for a certain period of time, the displacement effect is poor due to the sticking of scale and micelle in the partial hole and throttling element of injector A series of influences, such as the increase of the workload and the shortening of the period of measurement and adjustment, etc. However, the existing anti scaling technology mainly deals with the parts that are easy to scale, which has the advantages of high lubrication, low friction and non viscosity. However, due to the variety and different performance, it is necessary to compare and evaluate the anti scaling performance. However, the conventional coating evaluation method mainly judges the advantages and disadvantages of the coating technology through the conventional inspection indexes such as appearance size, roughness and smoothness There is no practical significance for the evaluation of the anti scaling performance of the special environment of ternary injection. Based on the field test, this paper forms a set of evaluation method for the scale prevention performance of ASP flooding, realizes the evaluation and optimization of the scale prevention performance of ASP flooding, and effectively prolongs the testing and adjusting period
Study on Phosphate Removal from Water Using Adsorbent Synthesized from Spent Zn-Mn Battery
Authors: Xu Ke , Deng Tong , Li Chunguang 
Published: October 2020

Abstract
The adsorbent synthesized from spent Zn-Mn battery was used to purify phosphate from aqueous solution. From the results it could be seen that pH value affected phosphate removal significantly, optimum pH in the purification process was 8.0. The removal rate of phosphate increased when the adsorbent dosage improved. The reaction process was fast and the purification ratio could reach 96.2% for 10 minutes. The adsorption isotherm of phosphate purification fitted Langmuir equation and Freundlich equation. The Q0 value in Langmuir equation was 56.82 mg/g and the n value in Freundlich equation was 3.61. From spent Zn-Mn battery effective adsorbent for phosphate removal could be synthesized.
Study of Diffused Result in CAO Fei-dian Sewage Deep Sea Discharge Engineering
Authors: Yu Hang 
Published: October 2020

Abstract
The wasted water diffuser is an important engineering technology to protect marine environment. It is very important in the protection of water environment in port. The diffusion effect of sewage in the ocean depends on the study of the angle parameter of the diffuser in physical model test, and CAO Fei-dian sewage deep sea engineering was an example in this article. In the engineering, jet angle is 0 degree, and horizontal angle is 0 degree too. This design not only ensures that sewage is adequately diluted, but also that the marine environment is not disturbed. This technology will play an increasingly important role protection of marine environment in the future.
Study on Green Decolorization Technology of Agar in the Extraction Process
Authors: Cai Ying , Wu Zhanxia , Li Sidong , Wang Minting , Guo Wanting , Hu Zhang 
Published: October 2020

Abstract
To establish a green decolorization technology of agar in the extraction process, the effects of activated carbon amount, decolorization time and decolorization temperature on the decolorization of agar solution extracted from Gracilaria rubra were investigated through single-factor tests with the decolorization ratio as an index. On the basis of single-factor tests, the decolorization process was optimized using orthogonal experiments. The results showed that the optimum conditions for decolorization with activated carbon were as follows: amount of activated carbon 0.6 g/100mL, decolorization time 5 min and decolorization temperature 70 °C. When the optimum conditions of decolorization with activated carbon were used on the basis of pre-treatment of diatomite, the decolorization rate of agar solution reached 81.6%, and the agar solution was nearly colourless, clear and transparent. The diatomite-pretreated decolorization of activated carbon overcame the disadvantages that chemicals are needed to acidify and bleach Gracilaria in the traditional agar extraction process. It not only avoided the use of chemicals, but also effectively decreased the water consumption and the amount of produced chemical-containing waste water.
Agricultural Products’ Custom Bundling Pricing Based on Positive Externality
Authors: Wang L , Pan Y , Sun X 
Published: October 2020

Abstract
Agriculture, rural and farmers are world-wide issues, and agricultural products have long been a problem for China’s "agriculture, rural and farmers". Because agricultural products show strong positive externality, the formulation of bundled pricing strategy can not only reflect the characteristics of agricultural products, but also in line with the development trend of Chinese agriculture. This paper studies the pricing of product bundles under positive externality- with agricultural products as the object, combined with the pricing of agricultural products, and discusses the situation of custom bundled pricing of agricultural products under positive externality, and provides reference to the custom bundled pricing strategies of agricultural products for rural areas, agriculture and farmers in China.
A Stochastic Programming Method for Resources Allocation in Education of Higher Vocational College
Authors: Kong Xiangming , Wang Donglin , Wang Yu , Wang Nan 
Published: October 2020

Abstract
A stochastic education resources management (SERM) model has been proposed to solve resource-allocation problems in education under uncertainty. The advantages of SERM are as follows: (1) it is capable for dealing with uncertainty which may exhibit random feature in the right-side of constraints; (2) the optimal education resource-allocation strategies for each higher vocational college under different constraint levels can be generated. The application in education resources sharing systems indicates that the optimal resource-allocation strategies generated by the SERM model can increase the total output of education value, which includes the personnel, technological and social outputs.
Effect of Aluminium Fluoride on the Structure and Properties of Cryolite Alumina Molten Salt System
Authors: Tian Guocai , Wang Yongzhi 
Published: October 2020

Abstract
The influence of aluminium fluoride AlF3 on the structure and properties of cryolite-Al2O3 melts are studied by molecular dynamics simulations at 1283 K and 0.1 MPa. The structure property such as radial distribution functions and coordination numbers, and the physical-chemical property such as density, conductivities, diffusion coefficients, and viscosities of the systems are obtained. It is shown that with the increase of aluminium fluoride content, fluorine ions in (Na3AlF6+4%Al2O3)1-w
(AlF3)
w
molten salt system will replace the position of oxygen in alumina to form aluminium oxy-fluoride ion group, while aluminium ion group will form larger aluminium composite ion group through the connection of oxygen bridge and fluorine bridge. The formation of these ionic groups results in the decrease of the diffusion coefficient of anion and anion, the increase of viscosity and the decrease of conductivity in (Na3AlF6+4%Al2O3)1-w
(AlF3)
w
, molten salt system.
Effects of the Applied Magnetic Field on the Quality of Resistance Spot Welding in Rail Vehicles Using Stainless-Steel
Authors: Xu Ye , Li Gangqing , Ye Jiehe , Han Xiaohui , Jin Cheng 
Published: October 2020

Abstract
The ring magnet nested on the surface of a spot welding electrode is used as the external magnetic field source. We analyzed the effects of an applied magnetic field on the appearance quality of joints, the nugget diameter of resistance spot welding for rail vehicles using stainless steel through comparative resistance spot welding experiments. A coupled electrical-magnetic finite element model was established to analyze the effect of magnetic forces on the welding current direction. Result show that the appearance of a magnetically assisted spot welding joint was significantly better than that obtained by conventional spot welding. The nugget diameter of the welding spot was also significantly increased. The Lorentz force introduced by applied magnetic field deflects the path of electrons in welding electoral field, which makes nuggets with a larger radius and a lower depth.