bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Polyvinyl Fiber-Steel Slag Powder on Mechanical Properties of High Toughness Cement-Based Composites
Authors: Feng Chao , Lv Hui , Xiao Chong 
Published: August 2021

Abstract
Steel slag micro powder is steel slag after special process grinding, is a by-product in the process of steel production. This paper studied the basic mechanical properties and crack control ability through the compression strength test (0,8%, 14%, 20%) by compressive strength test and four-point bending test of thin plate. The results show that the inclusion of steel slag has a negative effect on the compressive strength of high toughness cement base composite and not against folding strength. When the steel slag powder reaches 20%, the test matrix can still show large toughness characteristics and crack control capacity.
Effect of Sm-doped Ni-Al layered double hydroxide on electrochemical performance for supercapacitors
Authors: Shen Sijing , Guo Weimin , Zhuang Wei , Yang WenJuan , Qin Liping , Liu Xinmei , Yue Zhiwen 
Published: August 2021

Abstract
Sm-doped Ni-Al layered double hydroxides (LDHs) were successfully prepared via hydrothermal-assisted coprecipitation method. The structure and surface morphology of the samples were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectrometer (FT-IR) and scanning electron microscope (SEM). The electrochemical performance of the samples as prepared was measured by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). These results show that Sm-doped Ni-Al LDH exhibit higher specific capacitance 2177 F⋅g-1 at a current density of 1 A⋅g-1, compared with pure Ni-Al LDH with a specific capacitance 1312 F⋅g-1 at same current density.
Preparation and properties of hydrotalcite inorganic filler/polylactic acid composites
Authors: Liu Hongbo , Huang Zhiyong , Chen Xiuzhu , Zhong Junwen , Wang Ying , He Xiaohong , Liu Xuewu 
Published: August 2021

Abstract
Hydrotalcite inorganic fillers with different metal ratios were synthesized by coprecipitation method and hydrothermal method. The hydrotalcite inorganic fillers/polylactic acid composites (HT/PLA) were prepared by melt blending method. The mechanical properties, flame retardancy and thermal properties of the composites were investigated. The results show that HT inorganic filler was successfully prepared by coprecipitation method and it had typical HT structure. Compared with pure PLA, the impact strength and bending strength of HT/PLA composites decreased. The tensile strength, elongation at break, bending strength and tensile modulus of elasticity of the self-made M-Mg/Al-HT/PLA composite were better than those of the purchased C-Mg/Al-HT/PLA composite. The oxygen index of HT/PLA composites increased obviously, and the oxygen index of HT/PLA composites increased with the increase of the amount of HT. Different kinds of HT/PLA composites have different flame retardancy, and the order is Cu/Mg/Al-HT/PLA>Co/Mg/Al-HT/PLA>Ni/Mg/Al-HT/PLA>Mg/AlHT/PLA>Zn/Mg/Al-HT/PLA. The plasticity of HT/PLA composite is higher than that of pure PLA, and its thermal stability is better.
Effects of organic carbon source on the performance and bacterial structure in biofilm processes for source water pretreatment
Authors: Liu Ya-lei , Tu Bin , Yang Guang-feng , Zhao Yi-chun , Li Yi-shu , Fang Yuan-yuan , Song De-dong , Mu Jun , Sun Jing-ya , Zhu Liang , Xu Xiang-yang 
Published: August 2021

Abstract
The operation performance of biofilm system is limited by the oligotrophic quality of source water, especially the bioavailable organics. In this study, two lab-scale biofilm reactors (R1 and R2) feeding different organic carbon sources (OCS) were built up using sediment in drinking water source as bacterial source. Experimental results showed that sediment in biofilm systems enhanced the NH4
+-N removal performance. Using ethanol as OCS was more beneficial to the removal of NH4
+-N with ammonia removal efficiency (ARE) of 87.0 ± 5.4%, which was higher and more stable than that of glucose with ARE of 83.9 ± 13.3%. Organic carbon source changed the bacterial structure in biofilm systems. The dominant phyla in biofilm under ethanol condition were Proteobacteria, Bacteroidetes and Firmicutes with relative abundances (RA) of 29.1%, 32.7% and 22.0%, respectively. The dominant phyla in biofilm exposure to glucose was Proteobacteria with an RA of 63.4%. At genus level, Nitrospira, Lachnospiraceae, Arcobacter and Hyphomicrobium were dominant under ethanol condition (R1) with the total relative abundance of 20.5%. Sphaerotilus was the dominant genus under glucose condition (R2) with RA of 33.72%. These dominant bacteria were basically having the ability for the removal of nitrogen and organic matter.
Research on Friction and Wear Performance of Plasma Sprayed WC/Ni Coating
Authors: Sun Yang , Chen HaiFeng , Yang Jie , Xu TianQi , Jia JunHong 
Published: August 2021

Abstract
In this paper, atmosphere plasma spray (APS) is used to prepare WC/Ni coating on 1Cr18Ni9Ti stainless steel to enhance the wear resistance of materials of the axial-flow fan. The phase composition and microstructure of the spraying coating were analyzed, and the tribological properties of the coating were investigated through the ball-disk point contact sliding dry friction test. The results show that the spray powder is melting and spreading well by using nickel coated tungsten carbide powder as the spray powder combined with APS technology. The as-sprayed WC/Ni coating has a dense structure, slight oxidation. The hard phase tungsten carbide is evenly distributed and the interface of the bonding phase nickel is well combined with tungsten carbide. The microhardness of the coating cross-section can reach 655±90HV0.3. In the point contact wear test with high contact stress, tungsten carbide particles are pinned to the friction surface, which greatly improves the resistance to abrasive wear. The coating wear rate is only 2.42×10-6mm3⋅N-⋅m-1, and the anti-wear of the coating is about 136 times that of Inconel718 alloy under the same friction condition. The dry friction and wear mechanism of the WC/Ni coating are manifested as surface fatigue scale peeling. The large pieces of tungsten carbide particles are prevented from being pulled out and peeled because of the crushing of tungsten carbide particles and the bonding effect of nickel. And the anti-wear of the coating has not deteriorated due to fatigue during the high friction cycle.
Design and mechanical performance analysis of V-joint of new steel structure
Authors: Liu Wenting , Zhang Xiaomeng , Ren Qingying , Li Shengze 
Published: August 2021

Abstract
Aiming at the Beijing 2022 Winter Olympic Games, a new type of steel-wood combination sunshade structure system was proposed, and its selection was analyzed. The related joint forms were studied, and the new joint forms were put forward. The mechanical performance of the new joint was analyzed through tests and finite element simulation.
Effect of additives on the mechanical properties of bulk polymerized Acrylic using orthogonal test
Authors: Liu Di , Zhu Haitao , Ding Zhongjun , Zhang Yi 
Published: August 2021

Abstract
The effects of different additives on mechanical properties of acrylic were studied by orthogonal test, using methyl methacrylate as raw material, concentration of initiator(azobisisobutyronitrile), plasticizer (Dibutyl Phthalate) and release agent(Stearic Acid) as the influence factors. The results show that: among the three additives, initiator is the most significant factor, which has the greatest impact on the mechanical properties of acrylic. With increasing of initiator content, the tensile strength of acrylic decreases. The effect of plasticizer and release agent on the mechanical properties of acrylic is relatively small. As the increase of plasticizer content, the tensile strength and bending strength decline. Finally, the best ratio of the three additives is initiator=0.06, plasticizer=3.0, release agent=1.0.
The feasibility of aerobic granular sludge formation without inoculated sludge
Authors: song Tao , li Ji , Zhang Xiaolei , Shao Peibing 
Published: August 2021

Abstract
In this study, the feasibility of aerobic granular sludge formation without inoculated sludge was detected. After 10 days operation, AGSs were discovered in reactor and the MLSS and settling ability of AGS enhanced gradually. After 21 days operation, the effluent NH4
+-N and COD keep low than 10 and 100 mg/L, respectively. During the formation of AGS, the content of EPS gradually increased and remained stable. Microbial community showed that EPS secretion genera (such as Paracoccus, Flavobacterium and Thauera) were main genera in AGS.
Analysis of the thermal stability of a battery under overcharge and over-discharge
Authors: Wang Hongwei , Liu Jun , Gu Zhengjian , Zhu Yusong , Fu Yanling , Tao Ziqiang , Zhang Qing 
Published: August 2021

Abstract
The results indicate that, when a battery is over-charged, the battery’s surface temperature increases first because of ohmic heat, and after that, internal short-circuit occurs, resulting in the battery experiencing thermal runaway. However, in the case of over-discharge, the battery’s surface temperature rise is limited. Therefore, during actual use, attention needs to be paid so as to prevent a battery from over-charge.
Performance analysis of ORC low temperature waste heat power generation system
Authors: Peng Bin , Liu Shuai , Liu Huixin , Zhou Tianhao 
Published: August 2021

Abstract
For 90~180°C low temperature waste heat resources, three different types of organic working fluids, benzene, isopentane and R245fa are selected from the perspectives of safety, environmental protection and physical properties of working fluid. The mathematical models of the system are established through MATLAB and REFPROP and the influence of the evaporation temperature on the performance of the ORC low temperature waste heat power generation system is studied. The results show that the thermal efficiency and net output power of the system increase with the increase of evaporation temperature; the evaporation pressure of CFC-type working fluids is relatively low; the net output power and thermal efficiency of HFC and HC-type working fluids are generally relatively low. The evaporator has the largest irreversible loss in the system, followed by the condenser and expander while the working fluid pump has the smallest irreversible loss.
Study on shear stress distribution of glass fiber reinforced polymer soil nail in foundation pit support pullout test
Authors: Wang Xiang-li , Deng Chun-gang , Qin Yue , Shen Gang , Chen Chao 
Published: August 2021

Abstract
To solve the problem of reinforcement bolt corrosion caused by the safe stability problem in geotechnical engineering, and engineering red line in geotechnical engineering, the fiber-reinforced composite material is gradually applied to the civil engineering field, and glass fiber reinforced polymer has high strength, light quality, corrosion resistance, the advantages of easy cutting has been widely used. In this paper, the stress distribution and deformation characteristics of GFRP anchors in the process of pipe pulling are studied through the excavation tube pulling test of GFRP anchors in actual working conditions. Secondly, the performance difference between the GFRP bolt and reinforced bolt in foundation pit engineering is analyzed. The results show that the axial force of the GFRP anchor bolt decays fastest near the anchor head, and decreases with the increase of anchor depth The shear stress distribution is convex. With the increase of the drawing load, the shear stress peak will increase, and the influence range of the shear stress will also increase. With the increase of the load, the shear stress peak of the GFRP bolt and the anchor solid will shift to the position far away from the anchor head.
An Improved Method for Constructing Health Factors of Rolling Bearing
Authors: Shu Tao , Zhang Yichi , Xu Yan , Zhang Pengxiang 
Published: August 2021

Abstract
Aiming at the problems of low performance index and redundant information of multi-class physical health factors, a method of building rolling bearing health factors based on improved restricted Boltzmann machine is proposed. By fusing multi-class physical health factors, the virtual health factor of rolling bearings is constructed. Extracting physical health factors in time domain and frequency domain of rolling bearing vibration monitoring signals as inputs; the performance degradation mechanism model is added to the regularization term of the Restricted Boltzmann Machine, the performance degradation information contained in the input data is mined, the virtual health factor construction model of rolling bearings is built, and the model parameters are adjusted by the health factor evaluation criteria to improve the performance of the virtual health factor. The life cycle test of rolling bearings shows that compared with the principal component analysis method, the monotonicity of virtual health factors based on the improved restricted Boltzmann mechanism is increased by 147.6% and 38.5%, the trend is increased by 113.8% and 16.1%, and the robustness is increased by 60% and 8.42%, respectively.
Application of environmentally friendly amphoteric polyacrylamide hydrophobically modified with plant oil as additive in water-based drilling fluid
Authors: Lei Ming , Huang Weian , Sun Jinsheng , Shao Zixuan , Wu Tongliang , Fan Yu , Huang Haoyong 
Published: August 2021

Abstract
Hydrophobic associating polymers show great potential in formulation of high-performance drilling fluids, due to their hydrophobic associative ability in high-temperature and high-salt conditions. Herein, a novel amphoteric polyacrylamide of poly(acrylamide/2-acrylamido-2-methyl-1-propanesulfonic acid/methylacrylethyl trimethylammonium chloride) hydrophobically modified with epoxidized soybean oil denoted as PAADE was prepared and applied in water-based drilling fluid, and one without hydrophobic modification (PAAD) was also used for comparison. Compared with PAAD, PAADE displayed characteristic association behavior with a critical association concentration (CAC) of 0.3 w/v%, and a salt thickening phenomenon over 3 w/v% NaCl concentration. The impacts of PAADE and PAAD on rheological and filtration properties of bentonite-based drilling fluid (BTDF) were evaluated under different salinity. The fitted Herschel-Bulkley rheological parameters indicated that BTDF containing PAADE showed stronger yield stress, easier flowability and better salt resistance at a reasonable concentration below CAC. Meanwhile, PAADE largely reduced the fluid loss of BTDF before and after thermal aging at 150°C, showing high temperature tolerance. The addition of NaCl promoted larger reduction of filtration. The superior properties of PAADE in BTDF were revealed to be the competitive results of salt-induced hydrophobic association and inter-particles configuration transition. Moreover, the incorporation of epoxidized soybean oil improved the biodegradability of PAADE.
The effect of heavy metals on sulfur autotrophic short-cut denitrification
Authors: Wei Youcheng , Zhang Xiaolei , Liu Hui , Li Ji , Cheng Bohan 
Published: August 2021

Abstract
A batch experiment was used to investigate the influence of common heavy metals Cr(VI), NI(II), Cu(II) on sulfur autotrophic short-cut denitrification. Experimental results show that low concentrations (1-3 mg/L) of heavy metals have little effect on sulfur autotrophic shortcut denitrification, and high concentrations (4-10 mg/L) of heavy metals have obvious effects on sulfur autotrophic short-cut denitrification. Inhibition. The doserape model is used to fit the doseeffect curve of heavy metals, and the IC50 is used to judge the toxicity. The order of the IC50 of each heavy metal is: Cr(VI)>NI(II)>Cu(II). The effects of two heavy metals in the binary system of Cu(II) and NI(II) are antagonistic.
Metagenomics reveals the taxonomy and resistance mechanism of antibiotic resistance genes in bacterial communities of an aquaculture pond
Authors: Qu Jiangqi , Wu Yanfei , Liu Yi , Cui Yuxiang , Zhao Meng , Zhu Hua , Zhang Qingjing 
Published: August 2021

Abstract
In order to reveal the distribution characteristics of antibiotic resistance genes (ARGs) in freshwater aquaculture ponds, the microbial composition and antibiotic resistance gene types in the aquaculture environment were analyzed by using high-throughput and metagenomics sequencing technology. Our results showed that there were significant differences in the dominant bacteria composition in the water and sediment of aquaculture ponds. The dominant phylum in aquaculture water was Actinobacteria, Proteobacteria, Cyanobacteria and Bacteroidetes, while the phylum Actinobacteria, Chloroflexi and Proteobacteria were enriched in sediment. Compared with the comprehensive antibiotic research database (CARD), a total of 187 ARGs were identified, which were mainly multidrug, MLS and Tetracycline antibiotic resistance genes. There were 5 resistance mechanisms in the aquaculture environment, of which antibiotic efflux was the main resistance mechanism. Correlation analysis between ARGs and microbes showed that the abundance of Bacteroidetes, Cyanobacteria and Chloroflexi significantly affected the abundance of major resistance genes. This study is of great significance to protect the micro-environment of aquaculture ponds and control the pollution and spread of ARGs.
Research Progress on degradation of Organic pollutants in Water Body by Iron-based Materials activated persulfate
Authors: Dong Lei , Pan Xiong , Zhang Sheng , Lin Li , Yin Guochuan 
Published: August 2021

Abstract
The advanced persulfate oxidation technology has shown great potential in the efficient degradation of organic pollutants in water body, owing to its strong oxidation ability, easy operation and many other advantages. At present, the development of this technology focuses on the choice of activation mode of persulfate, and its essence lies in the cleavage of O-O bond in persulfate. Iron-based catalysts have been widely used in persulfate activation because of their advantages such as earth abundance, eco-friendliness and cost-effectiveness. In this paper, the methods and research progress of activating persulfate by iron-based materials (including nanometer zero-valent iron, common zero-valent iron, nanometer iron tetroxide) are reviewed. Finally, the existing problems and development direction of persulfate advanced oxidation technology in the current application are analyzed, in order to promote the development of related research work.
Characteristics analysis of sugar beet powder fermentated by staphylococcus xylostose
Authors: Yu Hao , Haibin Li , Siyu Shi , Ting Li , Jiayun Kang , Wenhui Liang , Meixia Pang , Fang Wang , Jinghua Qi 
Published: August 2021

Abstract
As a color and antiseptic additive, nitrite has been widely added to meat products. The large amount of nitrite remaining in meat products will generate carcinogenic nitrosamines in the body after eating, so natural sources of nitrate-rich fermented vegetables Powder has certain potential as a substitute for nitrite. In this paper, fermented beet powder rich in nitrite as the research object, spectral characteristics were analyzed. The stability of its pigments under the conditions of temperature, time, pH, metal ions, oxidants and preservatives were studied. The results showed that the maximum absorption wavelength of fermented beet powder measured with an ultraviolet spectrophotometer was 538 nm. The conditions that most affect the content of betacyanins were temperature, pH, and metal ions.
Quality Control of Polyacrylamide Products with Infrared Spectroscopy
Authors: Peng Yunyan , Rong Yan , Feng Shichun , Jin Dong 
Published: August 2021

Abstract
The anionic, cationic and nonionic polyacrylamide samples, as well as four kinds of inorganic salt samples, including sodium sulfate, sodium chloride, sodium carbonate and ammonium sulfate, were respectively analyzed with Fourier transform infrared spectroscopy (FT-IR) to establish their standard reference infrared spectra, meanwhile the characteristic peaks are distinguished. At the same time, the polyacrylamide samples containing different concentration and different kinds of inorganic salts were respectively analyzed with FT-IR to establish their IR spectra. Then a method used for quality control of polyacrylamide products was established, which can be used to evaluate the purity of the products, determine the impurities and relevant contents preliminarily.
The effect of Strontium contents on novel MIEC1-MIEC2 dual-phase ceramic-based oxygen transport membranes
Authors: Bai Wei , Feng Junxiao , Luo Chunhuan , Han Jingxiao , Wang Hailiang 
Published: August 2021

Abstract
Although ceramic-based oxygen transport membranes (OTMs) have irreplaceable advantages over traditional oxygen production technologies, their oxygen permeability and stability need to be further improved. Based on the theoretical starting point of increasing the three-boundary reaction zone and reducing blocking effect, a set of new dual-phase membranes 75wt%Ce0.8Sm0.1Cu0.1O2-δ-25wt%-Sm0.8Sr0.2Co0.8Fe0.2O3-δ (CSC-8282) and 75wt%Ce0.8Sm0.1Cu0.1O2-δ-25wt%Sm0.3Sr0.7Co0.8Fe0.2O3-δ (CSC-3782) with different strontium contents were prepared by a one-pot sol-gel method ensuring that each element has the same chemical potential. The surface morphology, crystal structure and element distribution are systematically studied by SEM, XRD and EDS, which confirms that the synthesized membranes have an obvious dual-phase structure and excellent compactness. The results of the oxygen permeability experiment show that the oxygen permeability of CSC-3782 is always higher than that of CSC-8282 under any conditions due to the inducing effect of strontium on oxygen vacancies, and flow rate of CSC-3782 at 960°C reached 0.64 and 0.22mL⋅cm-2⋅min-1 for He and CO2 as a sweep gas, respectively. The final long-term stability test confirmed that the dual-phase composite membrane with great prospects for development has high temperature stability and CO2-tolerant property, and the doping of strontium to A-site of perovskite contributes to the improvement of its performance.
PFC Numerical Simulation Study of Thermal-mechanical Coupling of Sandstone under Unidirectional Heating
Authors: Xin Lin , An Mingyu , Feng Mingze , Cheng Weimin , Li Kaixuan , Wu Jing , Li Jiaze 
Published: August 2021

Abstract
In order to study the rock thermal cracking law of the roof rock in the combustion zone of underground coal gasification under the special condition of unidirectional heating, the PFC particle flow software was used to carry out the numerical simulation of thermal-mechanical coupling. The uniaxial compression experiment was used to complete the PFC parameter calibration, establish a mechanical model, and compare the results of the unidirectional heating test with the simulation results. It was found that the relationship between the temperature at the measuring point, the thermal stress and the heating time of the two is very similar. It shows that the simulation results are highly accurate. The simulation results are as follows: when the model is at 450°C and 600°C, larger-scale cracks are formed and the second larger-scale crack evolution occurs; acoustic emission simulation can be divided into three stages: the first peak stage, the energy accumulation stage, and the second stage. In the second peak stage; the number of model cracks increases with the increase in temperature, and the shear cracks are the main ones, indicating that the model will expand laterally after being subjected to thermal stress, mainly occurring shear failure.