bluuebunny/crossref_metadata_2025_split huggingface dataset:
Online transportation workers in Palembang City: context and characteristics
Authors: Saputra Wahyu , Rum Giyarsih Sri , Joko Pitoyo Agus 
Published: March 2020

Abstract
Online transportation has become a necessity for people in Palembang City in particular. Palembang City is the only city in South Sumatra Province that has online transportation services. The existence of these services is related to the existence of disruptive innovations in the field of transportation services. Transportation which so far has only been based on conventional, has now changed to being based online. The purpose of this study is to describe the characteristics of online transportation workers in the city of Palembang. The research method used is quantitative with a descriptive approach. Data were collected by means of a survey of 384 respondents. Data analysis was performed using descriptive statistics. The results showed that online transportation workers in Palembang were dominant at a young age with a range of 18-28 years. Male gender is more dominant, mostly unmarried, migrant status originating from various regions in Sumatra and Java. Their education level is predominantly high school / vocational school with income of more than Rp 3,000,000. Their vehicle ownership status is private vehicle status.
Label free detection of uric acid using Si nanowire PH sensor
Authors: Lin Suhua , Wang Jing , Lin Yilin , Wang Xiaohua 
Published: March 2020

Abstract
In this study, we successfully apply a silicon nanowire FETs biosensor for detection of uric acid according to pH change. The pH sensing experiments of the silicon nanowire FETs shows that average sensitivity of 42mV/pH. We show that silicon nanowire FETs configured as pH sensors can be used for the quantitative detection of uric acid at concentration as low as 2.4mg/dL. The sensor shows a good linearity (R2 = 0.99) and sensitivity (60mV/mM) in the concentration range of 3-8mg/dL, with less than 300 sec response time. These results demonstrate that silicon nanowire FETs based biosensor can potentially be served as the diagnosis tool for general clinical examinations.
One-pot Synthesis of Multifunctional PAM@FeNPs Composite Microspheres
Authors: Wang Jun , Wang Jinke 
Published: March 2020

Abstract
Multifunctional composite microspheres are with variety of applications. In this study, one-pot dot polymerization synthesis was utilized to construct the polyacrylamide@Fe3O4 nanoparticles (PAM@FeNPs) composite microspheres. This composite microspheres featured as uniform size, great magnetic property, extremely stable visible and near-infrared autofluorescence produced by glutaraldehyde crosslinking. In conclusion, this study provides an important insight into the preparation of multifunctional composite microspheres.
Effect of micro-arc oxidation time on coating formation of AZ91 magnesium alloy in silicate electrolyte
Authors: Chen Xianming , Fan Yingying 
Published: March 2020

Abstract
The micro-arc oxidation behavior of AZ91 magnesium alloy in silicate alkaline electrolyte was studied. The effects of micro-arc oxidation time on film formation and microstructure were investigated and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), emission spectrometry (ICP) and salt spray test. The results show that oxidation time has an important effect on the surface morphology, thickness, phase structure and corrosion resistance of micro-arc oxidation film. With the increase of treatment time, the surface roughness and pore size increased. The acid ion (SiO3
2-) in electrolyte plays an important role in the formation of phase in the early stage of micro-arc oxidation, and the formation rate of MgO is dominant in the later stage. The corrosion rate decreases first and then increases with the increase of treatment time, and the corrosion rate of the sample processing 30min is lower under our technological conditions.
Influence factors of the chitosan degradation by pawpaw protease
Authors: Wang Qingyu , Shi Liang , Shen Yukai , Chen Xin , Chen Weidong 
Published: March 2020

Abstract
The pawpaw protease is used to degrade chitosan to prepare a low molecular weight chitosan-reducing sugar.The effect of temperature, pH value, reaction time and enzyme addition on the degradation of chitosan was investigated by single factor experiment with the reducing sugar concentration of the degradation solution as the index. The experimental results show that with the increase of the amount of enzyme added and the prolongation of the reaction time, and the degradation rate of chitosan increased and the concentration of reducing sugar increased. As the increase of pH and reaction temperature, the concentration of reducing sugar first increases and then decreases. The optimal conditions for chitosan degradation is 4.1 of the pH value, 42 °C of the reaction temperature, 1.4 h of the reaction time, and enzyme addition amount is 30 U/mg. Under the above conditions, the reducing sugar concentration reaches 1.57 g/L, and the rate is 15.7%.
Experimental study on municipal sludge rotary deep dewatering device
Authors: Yin Fengjiao , Zhao Gaiju , Wang Shouquan , Jiang Bin , Shi Yongchun 
Published: March 2020

Abstract
In view of the problem of drying high-humidity and high-viscosity sludge, it is analyzed in the water characteristics and drying characteristics of municipal sludge, optimizing the design of key components of ordinary rotary cylinder dryer and conducting industrial simulation experiments. The results show that: the self-cleaning and dispersing rotary cylinder dryer has higher heat exchange efficiency, smaller discharge particles and better drying effect than ordinary rotary cylinder dryer, which is a useful exploration for the research, development and popularization of municipal sludge deep dewatering process.
The determinants of energy consumption in China: a spatial panel data approach
Authors: Cao Huashen , Xu Yanli 
Published: March 2020

Abstract
As the second largest country of energy consumption around the world, China is facing an increasing pressure on energy-saving and emission-reduction. However, there is little research to study the spatial features and determinants of China’s energy consumption. This paper uses province level data in China from 2006 to 2016, and spatial panel model to analyze the determinants of energy emissions in China. The results indicate that the provincial energy consumption has a certain spatial autocorrelation, however, which is not strong. Regression results show that industrial development, economic level and financial development have significantly positive effects on energy consumption.
Study on the influence of waste residue of mixing station, slag and water slag on the strength of cement mortar
Authors: Hu Lizhi , Wang Shu , Wang Chan , Bao Ming , Wu Yuanyuan 
Published: March 2020

Abstract
In their paper. In this paper, the influence of the waste residue of the mixing station on the strength of cement mortar was studied. And the influence of the different content of the waste residue of the mixing station, slag and water slag on the strength of cement mortar was studied to get the optimal proportion. The study showed that when the mass ratio of the waste residue of mixing station, slag and water slag is 3:3:4 and 3:2:5, the synergistic effect of the three materials can be fully exerted, the grinding characteristics of the waste slag of the mixing station can be effectively improved, and the hydration activity of the waste slag of the mixing station can be improved.
Low cycle fatigue properties of 7050-T7451 aluminum alloy under different strain ratios
Authors: Tong Dihua , He Yuhuai , Hu Benrun , Chen Bo , Zhao Yanguang 
Published: March 2020

Abstract
The low cycle fatigue properties of 7050-T7451 aluminum alloy was studied. The low cycle fatigue properties of 7050-T7451 aluminum alloy at three strain ratios R = -1, 0.02, and 0.5 were measured by axial strain control method on MTS electro-hydraulic servo testing machine. In this research, the relationship between cyclic stress and strain at strain ratio R = -1 and the average stress relaxation effect of R = -1, 0.05 were given. The equivalent strain model was used to draw the strain-life curve for low cycle fatigue life data. The results show that under different strain ratios of 7050-T7451 aluminum alloy, the same strain amplitude in the high strain region leads to approximate fatigue life, and the effect of the strain ratio is only reflected in the low strain region.
Effect of extrusion routes on thermal stability of pure titanium processed by equal channel angular pressing
Authors: Wang Hongfei , Ban Chunyan , Qin Tipeng , Zhao Nannan , Liu Sitong , Kang Yiyao , Cui Jianzhong 
Published: March 2020

Abstract
Thermal stability of samples deformed by equal channel angular pressing (ECAP) using route BC and B135 was studied. The new route B135 was developed by defining 135° clockwise rotation of samples in each pass. After ECAP processing, samples were heat treated at different temperatures for a period of time. The effect of the two different routes on thermal stability of the ECAPed samples was investigated in detail. Electron backscatter diffraction was used to detect the processes of both recovery and recrystallization during thermal processing. Also, the effect of extrusion route on thermal stability of the deformed samples was further investigated by microhardness measurements.
Research on Rural Community Construction with Modern Rammed Earth Materials
Authors: Chen Zhenya , Guo Yu , Zhang Lingqing , Yan Jing , Fu Wenfeng , Wan Jiangjun , Tang Xiaohong 
Published: March 2020

Abstract
The soil exists in the vast countryside. Rammed earth materials are an important part of the growth process of rural dwellings. With the emergence of the homogenization of architectural style and the lack of cultural atmosphere of rural characteristics in the construction of beautiful countryside, the development and application of modern rammed earth materials will help the future construction of rural communities. Taking rammed earth dwelling houses in Sichuan as the research object, this paper constructs the livability evaluation system of rammed earth community, analyses the evaluation of residents’ satisfaction, and thus obtains the optimization strategy of modern rammed earth dwelling houses. From the theoretical perspective of "Ternary mutualism", the relationship between modern rammed earth materials and rural communities is mutually beneficial, that is, modern rammed earth materials are the natural foundation, charm display window and practice platform of rural communities, and rural communities are the embodiment of the value of modern rammed earth materials, protection continuation and multiple innovation. Based on this, the construction path of modern rammed earth materials in rural communities is proposed, in order to provide reference for the construction of rural communities using modern rammed earth materials. The research results show that modern rammed earth material, as a unique construction material, is conducive to the construction of rural communities in harmony with the natural ecological environment of the local landscape, and plays a role in the protection and inheritance of local culture.
Study on the Microstructure and Properties of Al/Cu Laser Filled Solder Joint
Authors: Wang Long , Hu Dean , Cheng Donghai , Chen Yiping , Dai Changqing , He Kai , Chen Yufu , Liao Feilong 
Published: March 2020

Abstract
Using IPG-YLS-4000 fiber laser to weld T2 copper plate and LY16 aluminum alloy plate, using Zn-10%Al flux cored wire as filler material, the microstructure of the joint was observed and analyzed by SEM and EDS, and the effects of laser power, welding speed and welding line energy on the mechanical properties of the joint were studied. The results show that the joints are mainly divided into copper side brazing area, weld center area and aluminum side fusion welding area. Among them, there are two interface reaction layers composed of intermetallic compound (IMC) in the copper side brazing area, the first layer is CuZn compound in the form of strip, and the second layer is Al2Cu phase in the form of shoot. The central area of the weld is mainly composed of massive α-Al phase and branched β-Zn phase. The tensile strength of the joint increases first and then decreases with the increase of laser power, welding speed and welding line energy. The thickness of IMC layer grows linearly with the increase of line energy. The best process parameters: when the laser power is 2200 W, the welding speed is 0.9 m/min, the welding line energy is 1446.67 J/cm, the IMC layer thickness is 10.11 μm, and the tensile strength reaches the maximum value, 252.6 MPa.
Preparation of low molecular weight chitosan by pawpaw protease
Authors: Zhang Yongli , Shi Liang , Chen Wenjing , Chen Xin , Chen Weidong 
Published: March 2020

Abstract
Pawpaw protease was used to degrade chitosan, and then obtained low molecular weight chitosan and reducing sugar in this study. According to the orthogonal experiment on the degradation of chitosan by pawpaw protease, the effects of temperature, pH value, reaction time and enzyme dosage on the decomposition efficiency of chitosan were investigated with the concentration of reducing sugar in the degradation solution as the index. The experimental results show that the optimal conditions for the degradation reaction are: the pH value of 4.1 and the reaction temperature of 42 °C, the reaction time of 1.4 h and the amount of enzyme of 30 U/mg, the concentration of reducing sugar in the degradation solution of 1.57 g/L and the yield of 15.7%.
Study on hot deformation behaviour and microstructure of Zr-4 alloy
Authors: Zhou Xuan , Wang Kelu , Li Xin , Gao Xiayun , Zhong Mingjun , Feng Rui 
Published: March 2020

Abstract
The isothermal compression experiment of Zr-4 alloy was accomplished by using Gleeble-3500 thermomechanical simulator. The hot deformation behaviour at the strain rate of 0.001~10s-1 and the deformation temperature of 750~1000°C was researched. The characteristics of flow stress were studied. The result is that the flow stress has a great influence on the deformation temperature and the strain rate. Based on the experimental data, the strain rate sensitivity map (m) was established. Through microstructure observation, the zones at lower m value are mainly flow localization (750 °C/10s-1) and kink (950 °C/10s-1). The zones at higher m value are mainly spheroidization. The result is that at strain rate of 0.01~0.1s-1/deformation temperature of 900~1000 °C is the suitable deformation parameter of Zr-4 alloy.
Mechanical properties and microstructure of coordination toughened epoxy based composites
Authors: He Yunyi , Wang Ruocheng , Wang Zhao , Kang Hongwei , Zhang Chenxi , Jin Haiyun , Gao Naikui 
Published: March 2020

Abstract
In this paper, toughening epoxy based composites were fabricated, the mechanical properties were measured and the microstructure was observed, the performance changes of epoxy casting system under different components were compared and analysed, coordination effect of multi-toughened was also investigated. Results showed that, the toughening agent and fumed silica as toughening fillers had the best strengthening and toughening effect on epoxy matrix with the addition of 4wt.% and 3wt.% respectively. Finally, by combining the different influence mechanism of the two fillers on the matrix, the comprehensive properties of the epoxy casting insulating materials were further improved. The results showed that the synergistic effect was obtained when the two fillers were blended with 3 wt.% toughener and 1 wt.% fumed silica. The tensile strength and impact strength were 67.42MPa and 13.69kJ/m2, which were 67.51% and 37.15% higher than those of pure epoxy.
Drying Experiment and Drying Model Analysis of Dehydrated Sludge Particles
Authors: Zhao Gaiju , Yin Fengjiao , Liang Xi , Yuan Dongling , Geng Wenguang , Wang Luyuan , Sun Rongfeng 
Published: March 2020

Abstract
A sludge drying experiment was conducted with dehydrated sludge particles as the research object, and the effects of temperature and particle size on sludge drying characteristics were discussed. The results show that the average drying rate of sludge can be increased by increasing the drying temperature and decreasing particle size of sludge, that is, the drying process of dehydrated sludge particles is controlled by internal migration. According to Fick’s second law, the simplified diffusion model of sludge drying is obtained by regression of experimental data, the simulation results obtained by the simplified diffusion model are in good agreement with the experimental results, which can well reflect the drying process of sludge particles and provide technical basis for the control of dehydrated sludge particles drying process.
Study on preparation of chito-oligosaccharide by cellulase hydrolysis
Authors: Chen Xin , Li Gaofeng , Dong Pengcheng , Sun Huili 
Published: March 2020

Abstract
By using cellulase enzymatic hydrolysis preparation to obtain low molecular weight chito-oligosaccharide. The conditions for the hydrolysis of chitosan by cellulase were studied by single factor experiment. The effects of temperature, pH value, reaction time and enzyme dosage on the decomposition efficiency of chitosan were investigated.The conclusions from the experiment are as follows: the optimum conditions for the preparation of chito-oligosaccharide by cellulase hydrolysis are reaction temperature of 50 °C, pH of 4.8, enzymatic hydrolysis time of 3.5 h, the enzyme dosage of 50 U/mg, in this case its economic benefits is greatest.
The fragmentation of thin-walled Q235 steel shell under explosion
Authors: Wei Jifeng , Du Zhixin , Zheng Yonghui , Zhang Liang , Lv Zhenbin 
Published: March 2020

Abstract
The fragmentation of a shell filled with explosive is quite valuable for evaluating the killing ability of improvised explosive device. A typical explosive device with Q235 steel shell and TNT explosive is chosen to study the fragmentation of thin-walled structure. With sand recovery method, experiments are conducted to get fragments with the mass above 0.1g. G-S formula shows a better agreement with experimental results when predicting average fragment mass than Mott formula. Further researches show that shell thickness and length-diameter aspect ratio have great effect on the fragmentation of shell. Average fragment mass increases exponentially and total fragment number decreases exponentially when shell thickness increases, while average fragment mass remains almost unchanged and fragment number grows linearly when length-diameter aspect ratio increases. These results are very helpful for whenever academic study or real application.
Effect of Oxidized Polyethylene Wax on Curing Process of Powder Coatings
Authors: Wang Wenxue , Wang Yujue , Han Yuying , Liu Ziliang , Wang Chuanxing 
Published: March 2020

AbstractIn this paper, differential scanning calorimetry (DSC) was used to analyze the reaction kinetics of powder coatings. The effects of oxidized polyethylene wax (OPEW) on the curing process of powder coatings were investigated by exploring the curing process of OPEW-Owt% and OPEW-8wt% powder coatings. The Tgof OPEW-8wt% powder coating was 57.1 °C, which was greater than the Tgof OPEW-Owt% powder coating, indicating that OPEW increased the storage stability of the system. The apparent activation energy (Ea) of the two powder coatings was investigated by the Kissinger and Doyle-Ozawa equations. The Crane empirical equation was used to calculate the curing reaction order (n) of the two powder coatings, and the curing kinetics was discussed. The Eaof OPEW-0wt% was 64.35 kJ⋅mol-1, and the Ea of OPEW-8wt% was 60.95 kJ⋅mol-1, indicating that OPEW could promote the curing reaction.
Orthogonal experimental study on preparation of chitosan oligosaccharide based on cellulase hydrolysis
Authors: Chen Xin , Xu Feng , Dong Shaofeng , Li Gaofeng , Sun Huili 
Published: March 2020

Abstract
The conditions of enzymatic hydrolysis of chitosan by cellulase were studied by orthogonal experiments. The effects of temperature, pH, reaction time and enzyme dosage on the decomposition efficiency of chitosan were investigated and the following conclusions were obtained by experiments: the major and minor relationship between the factors affecting the conversion of chitosan oligosaccharide prepared by cellulase hydrolysis is temperature > pH > time. The optimum conditions are as follows: at the reaction temperature of 50 °C, the pH of 4.8 and the hydrolysis time of 3.5 h. Under these reaction conditions, the content of reducing sugar is the highest, which is 1.59 mg⋅mL-1, and the economic benefit is the best.
Optimized Design of Aircraft Control Surface Driving Structure Based on Shape Memory Alloy
Authors: Li Fan , Li Yixuan , Zhao Jianhui 
Published: March 2020

Abstract
A driving structure using the shape memory alloy (SMA) wire to deflect an aircraft control surface was designed in this study. Instead of changing angle mounts or other conventional methods for changing the attitude angle of aircraft control surfaces, this driving structure drew on the existing idea of smart material SMA driven aileron deformation. The main contribution of this study is the optimization of the rib design inside the control surface: ribs with different numbers of hinged sections were evaluated and the location of the SMA wires were adjusted, to improve the range of achievable deflection angles and the ability of the rib to withstand aerodynamic force. Simulation results show that the use of a three-section or four-section rib effectively improves the aerodynamic effect of the control surface over the use of a two-section rib, especially under the action of larger aerodynamic forces; compared with a two-section rib, a four-section rib provides a deflection angle as much as 20% larger under aerodynamic pressure.
Sensitivity Analysis of Factors Influencing the Stability of Loess Landslide
Authors: Mu Peng 
Published: March 2020

Abstract
Sensitivity analysis is used to check and analyze the factors that have a greater impact on the stability of the landslide, and determine the most sensitive factors that affect the stability of the landslide. At present, the sensitivity analysis of the factors affecting the stability of loess landslides in high intensity seismic regions has not been reported. In this paper, taking a loess landslide in Wenchuan earthquake area as an example, the sensitivity of its stability factors is analyzed by using the improved grey correlation method, which provides the basis for the treatment and design of loess landslide.
Multifunctional modification of viscose fiber using plant extracts formulations
Authors: Li Huimin , Yu HuSheng 
Published: March 2020

Abstract
Some plant extracts with specific functions have been used to integrate with textiles, which can not only endowing the fabric with certain functions, but also accord with the concept of environmental protection and sustainable development. In this paper, codonopsis powder and thyme essential oils microcapsule were added to viscose spinning fluid. The obtained viscose fiber with various functions, such as antibacterial activity, anti-mould activity and anti-mites activity. In addition, the durability are also more than 20 washes. The multifunctional viscose fiber has a more extensive application prospect.