bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis and Evaluation of Pollutant Residues in Freshwater Fish at Jiamusi Section of Songhua River
Authors: Zhao Yufeng , Liu Jingyi , Liu Xu , Meng Qingqing , Wang Shuai , Jiang Tao , Bai Li , Yang Yang 
Published: January 2021

Abstract
Carp from Jiamusi section of Songhua River were collected to analyze and evaluate the residues of heavy metals, organochlorine pesticides, polycyclic aromatic hydrocarbons and volatile organic compounds in muscle tissue. The results showed that 100% of heavy metals, organochlorine pesticides and polycyclic aromatic hydrocarbons were up to standard, and a small amount of volatile organic compounds were detected. The structure and morphology of fish tissue samples were not abnormal, and the structure of nucleus and cytoplasm was normal. No pathological changes or morphological abnormalities were found. Fish were healthy.
Shaping Strategies of Resilience Landscapes in Urban Wetland Park
Authors: Zou Shuzhen , Sun Mengyu , Tao Biaohong , Xiong Cui 
Published: January 2021

Abstract
Environmental art design is a subject to deal with the relationship between artificial environment and natural environment, and also a subject to create a livable and ecological balanced living environment for human beings. Thus, it is of paramount of importance to study how artificial construction can adapt to the natural environment. To this end, the concept of physics “Resilience” is introduced into the landscape design of urban wetland park, and the strategies of shaping and utilizing resilience landscapes in urban wetland park is discussed in order to provide effective measures to deal with urban flood disaster, realize “sponge function”, promote regional ecological environment balance and sustainable development.
Analysis of the impact on the water quality of Cixi by areas along the north line of water diversion from Cao’e river
Authors: Fan Jianfen , Guo Huifang , Xu Xiaofeng 
Published: January 2021

Abstract
The north line of water diversion from Cao’e river is one of the six major water diversion projects in eastern Zhejiang Province. The project passes through three cities of YuYuCi. It mainly supplies water for Industry and agriculture, and takes into account the improvement of water environment. Cixi City is located at the end of the north line of water diversion from Cao’e river, and its water quality is affected by the nodes along the water diversion line. Using the least square method which can extract the main components of the independent variables on the dependent variables, the regression equations of the independent variables: Mushan sluice, Qitang sluice, Sitang sluice, Puqian sluice, xinsanjiang sluice and Luzhongwan pumping station are established, and the contribution values of each node to Luzhongwan pumping station under the indexes of permanganate, ammonia nitrogen, total phosphorus and dissolved oxygen are calculated. The results show that Sitang sluice has the greatest contribution to permanganate and total phosphorus of Luzhongwan pumping station, Puqian sluice has the greatest impact on ammonia nitrogen index of Luzhongwan pumping station, and xinsanjiang sluice has the greatest impact on dissolved oxygen index of Luzhongwan pumping station. Generally speaking, the stations which have the greatest impact on the water quality of Luzhongwan pumping station are Sitang sluice and Qitang sluice.
The spatial distribution of soil heavy metals and ecological restoration of Datong Abandoned Coal Mine in Huainan City
Authors: Sun Xianbin , Sun Liangping , Zhang Xing , Li Guangyao , Yu Maohui 
Published: January 2021

Abstract
Based on laboratory analysis of soil samples collected from abandoned coal mine in Datong area, content of heavy metals in the soils was monitored and the soils were evaluated for heavy metal pollution. The spatial distribution of heavy metals was study with means of Kriging method by under ArcGIS environment in the abandoned coal mine in Huainan area. The results show: (1) the content of 5 types of heavy metals( Hg, Cd, Cr, Pb, Cu) were all higher than Huainan area background value of soil elements, among of these heavy metals, the enrichment of Cd was higher and polluted quite seriously; the enrichment of Hg, Cr, Pb and Cu was lower, and polluted lightly comparatively. (2) The coal mine waste rock pile and abandoned chemical plant were the main pollution sources. (3) The heavy metal concentrations and space distribution were mainly affected coal mine waste rock pile, and abandoned chemical plant. (4) Positive correlation between concentrations of most heavy metals was significant, and there is a certain relationship between concentrations of heavy metals and organic matter, nitrogen, available phosphorus. On the basis of the above research, some countermeasures were put forward for ecological restoration in Datong abandoned coal mine.
Ultrasonic extraction and identification of carp scale collagen
Authors: Gao Qianqian 
Published: January 2021

Abstract
In this experiment, the carp scale as raw material, containing calcium and protein impurities in the scale and so on, respectively by two sodium EDTA (EDTA two sodium, EDTA) and sodium chloride solution (sodium chloride, NaCl) solution and its removal, scale collagen protein extraction and design. By using different single factor test the 4 factors determine the extraction of collagen during the experiment the optimum extraction process, the 4 factors are the enzyme (pepsin) dosage, ultrasonic time, solid-liquid ratio, extraction liquid (acetic acid) concentration of glue. The optimum extraction process for raw protein ultrasonic time 200Min, enzyme dosage 300mg/g, extraction concentration of 0.3 mol/L, the ratio of material to liquid 1:40 (g/mL), in this condition, the extraction rate was 28.7. By UV spectrophotometer identification, the material in the 230nm have obvious absorption peak, so the test the material of collagen.
Combustion Adjustment in Initial Startup Stage of 660MW Supercritical Fossil Power Unit
Authors: Du Jianqiao , Wang Chaoyang , Lu Xiao , An Guoyin , Yan Huibo , Ma Hui , Yan Xiaopei 
Published: January 2021

Abstract
In order to better improve economical efficiency, the newly built supercritical units mostly adopt more fuel-saving ignition mode, but in the initial startup stage, the parameters of unit and boiler are not compatible. This paper carries out study and analysis on parameters in the initial startup stage, and optimizes all parameters by adjusting startup feed-water quantity, fuel quantity, air volume and ratio for several times. With favorable effect, this paper may be used as good reference for other similar units.
Quantitative Structure Activity Relationship Analysis of Polypropylene during Ultraviolet Aging Based on Tensile Strength
Authors: Chen Kui , Zhang Tianyun , Liu Guangqiao , Zheng Xiaoping 
Published: January 2021

Abstract
In order to improving ultraviolet radiation (UV) aging resistance of polypropylene (PP) and expanding its application range, it is necessary to research the rule and mechanism of PP in UV aging process. On the base of Fourier transform infrared spectroscopy and differential scanning calorimetry characterization, the variations of structure parameter (crystallinity and carbonyl index) of homo-PP corresponding to different UV aging time were calculated and analyzed. Combined with tensile strength testing, the influences of both crystallinity and carbonyl index on tensile strength in UV aging process of PP were researched. Then the relationship formula between tensile strength and structure parameter was constructed based on linear relationship, and the quantitative structure-activity relationship of PP during UV aging was analyzed. The results show that, with the extending of aging time, the influence of crystallinity on tensile strength of PP declines, while that of carbonyl index is on the contrary. During UV aging, the tensile strength of PP rises slightly with the increase of crystallinity first, then acceleratedly declines for the increase of carbonyl index. It should be noted that, although the crystallinity of PP begins to decline after 100 h UV aging, its effect to tensile strength can’t be ignored while aging time is less than about 300 h.
Research on Defect Detection Method of Whole Surface of Small Ball Based on Field Scan
Authors: Zheng Runze , Chen Xin , Cai Xiaoyu , Wei Jiasi , Li Yuan 
Published: January 2021

Abstract
This paper introduces a detection method that uses a white-light interference microscope to scan along the circle of latitude line to detect defects on the entire surface of microsphere with a diameter of 2mm. The surface of the microsphere is exposed under the white light interference microscope from the top to the equator in turn according to the annular belts of different latitudes to make the acquired image cover the entire surface of the ball. The topography data is processed, the defects are identified, and the number of defects of different horizontal and vertical sizes is counted, so as to achieve the quantitative evaluation of the surface defects of the small ball.
A Preliminary Study on Testing the Compressive Strength of Sleeve Grouting Material Based on the Leeb Hardness Method
Authors: Ding Chenchen , Gu Sheng , Yuan Yiwei , Wu Yulong 
Published: January 2021

Abstract
In order to explore the feasibility of testing the compressive strength of sleeve grouting material in practical engineering by the Leeb hardness method, we made 12 groups of standard specimens out of grouting material, analyze the correlation between surface hardness and compressive strength of grouting material by experiments. Experimental results show that, The surface hardness test results of the sleeve grouting material are in accordance with the normal distribution. With the guarantee rate of 95%, eliminating the extreme value in the hardness test data can significantly reduce the discreteness of the data and improve the accuracy of the calculation results. There is a significant correlation between surface hardness and compressive strength of grouting material, the best fitting effect is by using exponential function, the average relative error is 7.45%, the relative standard deviation is 8.61% and the correlation coefficient is 0.864. The experimental results provide a reference for testing the compressive strength of sleeve grouting material by the Leeb hardness method.
A simple prediction method for the permeability coefficient of water-bearing sand layer after grouting compaction
Authors: Chen Jiale 
Published: January 2021

Abstract
Due to the particularity of the pumping of the compound paste slurry material, the traditional stress analysis method is difficult to apply. Based on the cylindrical hole expansion model of compacted grouting, the theoretical formula of the compacted grouting displacement field of soil is established on the basis of simplified body strain. Based on the displacement field theory, the analytical solution of the soil permeability coefficient after grouting and compaction is established according to the compressed porosity and Konzeny-Carman equation. The field test of compact grouting was carried out, and the water injection test was used to obtain the change of permeability coefficient before and after grouting under different grouting intervals. The obtained results are in good agreement with the theoretical solution and have certain engineering guidance significance.
Synthesis and characterization of polyimides containing pyridine ring
Authors: Li Zhun , Wang Ying , Zhu Shaomin 
Published: January 2021

Abstract
Monomer 2,2’-bis [4-(5-amino-3-methyl-2-pyridoxy) phenyl] propane was successfully synthesized by 2-chloro-3-methyl-5-nitropyridine and bisphenol A, and the structure of pyridine diamine monomer was confirmed by 1HNMR. A series of polyimides were prepared by two-step polymerization of the pyridine diamine monomer with five aromatic dianhydride monomers. The results show that the polyimide films had good thermal stability and mechanical properties. Tg was 236-300°C in DSC test and 240-299°C from DMA test, T5% and T10% weight loss at N2 were 470-492 and 499-515°C, respectively. Moreover, the polyimide films showed outstanding mechanical properties with tensile strength of 72-90MPa, tensile modulus of 1.8-2.4Pa, and breaking elongation of 5-12%. The cut-off wavelength was 338-399nm.
Study on magneto-acousto-electrical tomography based on laser-excited ultrasound
Authors: Yang Gang , Zhang Shen , Wu Ranran , Xun Lina , Hu Fan , Xia Hui 
Published: January 2021

Abstract
A new laser induced ultrasonic transducer (LIU-T) based on photoacoustic effect was presented. Compared with traditional piezoelectric transducers, Liu-T reduced electromagnetic interference and improved the sound pressure signal. Firstly, Liu-T was made and its sound field characteristics were characterized. The experimental results have shown that the sound pressure of this transducer can reach 3.9MPa and the frequency range was 2.5MHz-7.9MHz. Then an experimental platform for magneto-acoustic-electrical tomography(MAET) based on Liu-T was designed and built. Furthermore, B-scan images of abnormal copper plates were obtained by B-scan, which further indicated that LIU-T would play an important role in the field of NDT and biomedical imaging.
Design of Human-Computer Interaction System of Electro-hydraulic Hitch for Hillside Tractors
Authors: Fan Yongkui , Wang Yuanyuan , Zhu Zhongxiang , Lv Meng , Mao Enrong , Zhai Zhiqiang 
Published: January 2021

Abstract
In view of the complex terrain, low level of mechanization and intelligence in hilly region, a human-computer interaction system was designed for electro-hydraulic hitch control system of tractors in hilly region. According to the actual functional requirements of electro-hydraulic hitch control system of tractors in hilly areas, human-computer interaction interface was designed in flash environment, and CAN communication module in Human-computer interaction system was designed in Flash Develop environment. Finally, a hardware test platform of the human-computer interaction system was built in the room for laboratory tests. The results showed that the human-computer interaction system can meet the working requirements of the electro-hydraulic hitch control system of tractors in hilly areas.
Research status of photocatalysis and Thermal insulation building coatings
Authors: Dong Teng , Huang Yunfa , Song Xiaopeng , Lv Hongrui 
Published: January 2021

Abstract
The research status of photocatalytic and thermal insulation coatings at home and abroad was summarized. The different types of photocatalytic coatings were summarized. The factors influencing the photocatalytic coatings, such as the activity of photocatalytic coatings, the load of photocatalytic coatings, and the dispersion process, were expounded. The type and property of insulation coatings and the effects of fillers on the properties of insulation coatings were summarized. At present, the primary problem of photocatalysis and heat preservation and heat insulation building coatings in China is lack of research and development of dispersants and composite materials. The evaluation system of photocatalysis, heat preservation and heat insulation need to be improved. It is of significance for the multi-functional coatings with the performance of luminescent catalytic insulation.
Parametric finite element analysis of Buckling-Restrained Braces
Authors: Liao Xianghui , Zhao Chao , Liu Zengwei 
Published: January 2021

Abstract
The Buckling-Restrained Braces is an excellent seismic energy dissipator. In this paper, the effects of the three core width-thickness ratios, gaps, and constraint ratios of the Buckling-Restrained Braces on the seismic performance of the Buckling-Restrained Braces are studied and modeled and analyzed by ABAQUS The simulation results show that the Buckling-Restrained Braces has the best seismic performance when the width-to-thickness ratio is 10-16; when the gap is 1-2mm, the Buckling-Restrained Braces has the best seismic performance; when the constraint ratio is about 5, the Buckling-Restrained Braces The best seismic performance.
A Study on the Geotechnical Properties of Coal Ash after a Long Term Service Period in Transport Embankment Fill
Authors: Maakoe Tshegofatso , Deng Jianliang , Nepal Dikshit Babu , Simango Annah 
Published: January 2021

Abstract
An extensive range of studies have been conducted on coal-fired power station CCP’s in order to investigate their geotechnical properties for construction of structural fills. Many such researches are based on the performance of fresh ash, however very few have studied their behavior after a long term service period. There exists a rarely discussed CCP ash that was identified in this investigation. Understanding of the long term behavior of CCP’s is essential for motivation of their use in structural fills. This ash was used as an alternative to natural soils for the construction of transport embankment layerworks in countries such as the USA and South Africa. Several decades later after its use in railway embankment fills, the geotechnical properties are evaluated in this study by method of experimental investigation. A series of tests (particle size distribution analysis, specific gravity, compaction and permeability) were carried out with the objective of characterizing the material and determining the shear strength behavior by direct shear test. Test results revealed that the ash is comparable to a granular soil. The direct shear test results revealed that the ash exhibited a significantly high shear strength by the internal friction angle of 51.86°. Furthermore, a reversal and re-shearing of the sample was completed and presented a slightly lowered residual friction angle of 49.37°.
Constitutive Model of TC21 Titanium Alloy Based On BPNN
Authors: Dong Hongbo , Sun Chengtong 
Published: January 2021

Abstract
TC21 alloy is a new two-phase titanium alloy with good comprehensive properties of high strength, toughness and damage tolerance. The isothermal thermal compression deformation test of TC21 titanium alloy is carried out on the Gleeble-3500 thermal simulation test machine. Based on the stress-strain data at different temperatures and strain rates, the constitutive relation model of TC21 alloy was established by using BPNN(Back Propagation Neural Network), which has high prediction and generalization ability, and the predicted flow stress value is very close to the experimental data.
Effect of number of carbon atoms on the electron transport properties of carbon chain-graphene junctions
Authors: Liu Chunmei , Wang Junling 
Published: January 2021

Abstract
Using nonequilibrium Green’s functions in combination with density-functional theory, we investigate the electronic transport properties of carbon chains covalently connected with two bear armchair graphene electrodes. The results show that the transport properties are obviously dependent on the odd and even length chains located between graphene nanoribbons. For graphene nanoribbons connected to the chain with even chains, the negative differential resistance (NDR) is also observed in the I-V curves. The reason is that the even-odd effects are related to the connection structure between electrodes and carbon chains.
Study on Combustion Processes of a Premixed Charge Compression Ignition (PCCI) Engine Fueled with DME/Diesel
Authors: Zhao Yuwei , E Weibo , Niu Tianlin , He Jiangjiang 
Published: January 2021

Abstract
A dimethyl ether (DME) pre-mixing system was installed on a 2105 diesel engine for realizing pre-mixed charge compression ignition combustion mode. Combustion processes of a PCCI engine fueled with DME/diesel under various DME pre-mixing ratios were investigated in this paper. The results showed that the heat release process showed three stages with port induction of DME. As the DME pre-mixing ratio (PR) increased, the peak value of cylinder temperature and pressure raised and the corresponding crank angles advanced. The start of combustion (SOC) moved forward obviously and the duration of combustion extended; the peak value of the pressure rise rate reduced first and then raised. The results in this paper provided a reference for the combustion process optimization of DME/diesel PCCI engine.
Research on transformation design of nuclear support easy to disassemble based on ANSYS Workbench
Authors: Yuan Liang , Feng Tiezhu , Bai Jinchuan , Zhu Qinghai , Kong Xiangyong , Chen Sen , Shen Linshuang 
Published: January 2021

Abstract
The nuclear support, which is used to support pipe or equipment with nuclear safety level, is of great importance for nuclear power plants. In this work, we studied that the door type nuclear support was transformed to disassemble easily by installing bolts. The 3D models of nuclear support before and after transformation were established in ANSYS Workbench software. With the reasonable setting of the contact conditions and boundary, the deformation, stress and natural frequency were calculated in ANSYS Workbench by using the finite element method. The results show that bolted connections will lead to the loss of stiffness of support and natural frequency decrease. The order natural frequency of the support decreases with addition of the thickness of plates and the bolt circle diameter has little effect on global stiffness of the support. The finite element analysis results provide reference for the transformation design and optimization of nuclear support and have practical engineering value.
Design of Car Washing Control System Based on PLC
Authors: Meng Yanan , Hu Xiaoyan , Qi Feng , Chen Zhimin 
Published: January 2021

Abstract
In order to improve the efficiency of car wash and reduce the labor intensity of car washers. According to the process flow of automatic car washing and its characteristics of simple operation, high efficiency, convenience and stable operation, an automatic car washing control system based on PLC is designed, and WinCC configuration software is selected as the upper computer as the man-machine interface design. The simulation results show that the system has strong stability, improves the automation of car washing and meets the actual needs.
Adaptive bit Modulation equalizer
Authors: Dong Yabo , Fan Hong , Ni Lin , Shi Zhaoli , Zhang Ziwei , Fan Hong 
Published: January 2021

Abstract
Multipath effects usually occur in information dissemination, which leads to inter-symbol interference and affects the quality of communication transmission. This paper uses an adaptive equalizer to achieve channel equalization and eliminate inter symbol interference, and develops and verifies it on the FPGA using the ISE suite. Compared with the equalizer output error signal calculated on the MATLAB software, the calculation results of the two platforms are basically the same, which confirms that the design is feasible. The FPGA-designed equalizer implements hardware acceleration and is more suitable for high-speed real-time signal processing. After the data passes through the adaptive bit equalizer, the signal-to-noise ratio is improved, thereby reducing the bit error rate and verifying the relationship between the bit error rate and the signal-to-noise ratio.
Research on Performance of a New-Type Percolation Equipment Used to Extract Effective Medicine Components
Authors: Li Juan , Wu Jun , Wang Xiaochun 
Published: January 2021

Abstract
A new-type of multi-layer percolation equipment was developed and utilized to extract effective component of a certain traditional Chinese medicine. Porosity and penetration rate of 100-mesh medicine powders were measured respectively. Moreover, the superiority of the performance of such equipment over single percolation method and repercolation method was studied where the total solids content in percolated fluid was utilized as the evaluation index. The results show that for 100-mesh medicine powders, porosity and penetration rate of medicine powder layer both decrease with the increase of particle layer height; total solids content in percolated fluid of 100-mesh medicine powders is high, and the new-type multi-layer percolation equipment has the best performance in the extraction of effective component in the medicine.