bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of doping ions on the luminescence performance of terbium doped gadolinium polysulfide phosphor
Authors: Zhang Wenhua , Kou Huamin , Ge Lin , Zhang Ying , Lin Lin , Li Wei 
Published: June 2020

Abstract
Gd2O2S: Tb (GOS) phosphor screen has been widely used in digital X-ray imaging, and so far, numerous studies have been focused on the doping ions to improve the luminescence performance of the GOS phosphors. GOS: Tb, Dy phosphors were synthesized by the solid-state reaction process, and their phase composition, particle size, morphology and luminescence properties were characterized. The results showed that co-doping Dy3+ can promote the luminescence and the optimal doping concentration of Dy3+ ions were about 0.2%, however concentration quenching will occur when the doping concentration exceeded 0.5%. Ta5+ ion was also studied in the GOS: Tb and GOS: Tb; Dy phosphors prepared by the same method. The results showed that when the Ta5+co-doping concentration was 100ppm, the strongest emitted light intensity would be obtained for both phosphors. The photoluminescence spectra revealed a different influencing mechanism of Ta5+ ion comparing to Dy3+, which is by a strong energy transfer between Dy3+ and Tb3+.
Study of improvement in silicon bulk micromachining by metal assisted chemical etching
Authors: Guo Rensong , Huang Qiyu , Wang Shutang , Xu Jian , Cao Jiefeng , Lin He 
Published: June 2020

Abstract
Ensuring the integrity and uniformity of the fabricated structure is critical for silicon bulk micromachining. Our research demonstrates an efficient and low-cost method for silicon bulk micromachining by metalassisted chemical etching (MACE). The integrity and uniformity of the etched structures are greatly improved by the utilization of ethanol as the solvent instead of water. Our research helps to understand the mechanism of MACE, and can provide new ideas for the further study of morphology control of silicon block micromachining using MACE.
Oversaturation Overflow Detection at Intersections Based on Electric Police Data
Authors: Wang Hao , Wu Zhixin , Ju Jianmin , Huang Meixin 
Published: June 2020

Abstract
Traffic congestion is still an important problem that plagues the city. The “Deadlock” of the road network caused by the queuing overflow has a more serious for traffic. In the past, the overflow research was based on fixed detectors or floating car data with low sampling rate. It can only make rough judgments on queue overflow, and it is difficult to effectively support refined queue management. In recent years, the coverage of electronic police has become higher and higher, and the data has the characteristics of high sample rate and trajectory. Therefore, this paper is based on the electronic police’s license plate identification data to obtain travel time delay and vehicle relationship and building a queuing overflow model. Secondly, by constructing a VISSIM simulation model, and then judging the oversaturated queue overflow at the intersection library through the delay time, the validity of the model was verified by combining with the traffic data of Ningbo Zhenhai District. The research results provide theoretical basis and method support for road traffic queuing management.
Synthesis, Characterization and Dye-Sensitized Solar Cell Application of a Novel Symmetric Diphenylpyran Dye with Dual Rhodamine-3-acetic Acid Anchors
Authors: Wang Xinxin , Bolag Altan , Yun Wu , Zhang Xiaoying , Bao Tana , Ning Jun , Alata Hexig , Ojiyed Tegus 
Published: June 2020

Abstract
With simple three-step method, a new symmetrical metal free organic diphenylpyran dye containing dual rhodamine-3-acetic acid anchors was successfully synthesized, characterized and applied to dye-sensitized solar cells (DSSC). The dye has saturated methylene in its acceptor part, which makes the electron withdrawing group and the anchor group cannot be conjugated well. In addition, the exhibits lower molar extinction coefficients of the dye and its blue-shifted absorption spectrum also influenced the light capture ability. The resulting weaker intramolecular charge transfer and the electron coupling effect of the dye hindered the dye charge injection and shorten the electron lifetime, leading to an average power conversion efficiency of 0.65 % (Jsc
= 2.32 mA cm−2, Voc
= 448 mV and FF = 0.63). Further design of an efficient dye molecule needs efficient conjugation between the electron-withdrawing group and anchoring group, as well as an effective light harvest capability.
Review of research on durability of reactive powder concrete
Authors: Zhang Qing , Huang Liangxian 
Published: June 2020

Abstract
Insufficient durability is an important reason why sustainable concrete materials cannot be achieved. Reactive Powder concrete (RPC) has attracted wide attention of researchers due to its excellent durability. Therefore, a series of researches on the durability of RPC have been carried out in order to achieve sustainable development of concrete. Therefore, based on the research results of domestic and foreign scholars, the durability of reactive powder concrete is comprehensively discussed from two aspects: single factor effect and multi-factor coupling effect. Judging from the research results, whether under the action of single factor or multifactor coupling, reactive powder concrete has shown extraordinary durability performance, which proves its feasibility in creating durable concrete engineering; By summing up the existing research results, we also found its shortcomings, mainly including the lack of research on multi-factor coupling effects, especially the load-environment coupling effects, the lack of a micro-level description of the damage process, and the damage theory model is not yet clear, Evaluation methods, indicators are still to be studied and lack of actual data support and other issues.
Effects of antibiotics on anaerobic digestion resistance genes and archaeal communities in cattle manure
Authors: Zhang Xin , Zhang Kaiyu 
Published: June 2020

Abstract
In this paper, the effects of antibiotics on key enzymes genes of gas production pathway, diversity of microbial communities and ARGs changes during anaerobic digestion of cattle manure are investigated by adding antibiotics of different kinds and concentrations. TYL and SM2 increased the abundance of Methanosarcina in the acetic acid methanogens pathway by 29.04% and 52.79%, respectively, and CIP decreased the abundance of Methanobrevibacter and Methanosarcina. At the same time, CIP has a strong inhibitory effect on mcrA gene, and its abundance is 49% lower than that of the control group. SM2 increases ermF gene by 2 logs, and TYL and CIP by 1 log. Sul1 increased by 1-2 logs in the process of adding antibiotics to the anaerobic digestion process.
Parameter analysis and optimization of welding sequence for the aluminium alloy sidewall in a high-speed train body
Authors: Yu Kuigang , Wang Xianjin 
Published: June 2020

Abstract
The sidewall is the most complex structure and welding process part in the aluminum alloy train body, and its welding deformation is greatly influenced by welding sequence parameters. In this paper, the relationship between the welding residual stress and welding deformation of the sidewall and welding sequence parameters is studied, and the optimal welding sequence is determined. Using a verified finite element model of one intercepted sidewall, the relationships between the welding residual stress and welding deformation of the sidewall and the welding of welds, welding sequences of welds and the weld sequence are studied, respectively. Some conclusions can be drawn from the analysis results. One is that the welding results at one weld are only determined by self-welding, and have nothing to do with other welds, and welding results outside one weld are affected by welds on both sides. The second is that for a single weld, the from-one-end-to-the-other welding sequence is best, and the identical welding sequence is best for each weld. The third is that the fixed welds are firstly welded and a cross weld sequence is best.
Improve performance of soy protein adhesives with a low molar ratio melamine-urea-formaldehyde resin
Authors: Jiang Ke , Zhang Jialin , Xia Sanshan , Ou Chuan , Fu Chengang , Yi Maoyu , Li Wei , Jing Mingwei , Lv Wenxin , Xiao Hui 
Published: June 2020

Abstract
In this study, the low molar ratio melamine-urea-formaldehyde (MUF) resin and sodium hydroxide were used to modify soy protein adhesives, and the addition of MUF was studied as the influencing factor, the properties of soy protein adhesives, formaldehyde emission and bonding strength were studied. The results showed that the solid content and viscosity of the adhesives were suitable for the application of wood adhesives, the formaldehyde emission and wet shear strength of plywood prepared by soybean protein adhesive modified by MUF with 30% addition were 0.38mg/L and 1.25 MPa. Moreover, based on the analysis of the free formaldehyde content of the adhesive and the formaldehyde emission of plywood, it can be inferred that most of the free formaldehyde in the plywood was derived from the unreacted methyl group during the hot pressing process.
Temperature optimization of mold for autoclave process of large composite manufacturing
Authors: Hu Jian , Zhan Lihua , Yang Xiaobo , Shen Rulin , He Jiayang , Peng Nanfei 
Published: June 2020

Abstract
In autoclave processing, the temperature distribution of mold is important to the curing quality and performance of composite. The scale and complex structure of the mold have a great influence on heat transfer efficiency, which result in no uniform temperature field of the mold. Therefore, a method of heat transfer compensation is proposed, in which a “heat conducting fin” with high heat conductivity is installed in the section with slower heating process of the mold to improve the heat transfer efficiency of the mold and hot air, and to determine the structural size, quantity and reasonable installation position of “heat conducting fins” by combining CFD with heat transfer calculation. The results show that, combined with the typical panel mold, the heat transfer efficiency of the local section of the mold can be effectively improved by optimizing “heat conducting fin”, the maximum temperature difference of the mold surface is reduced by 15.1%, and the temperature gradient along the axial direction of the mold is decreased.
Preparation of Fe3O4/PVP magnetic nanofibers via in situ method with electrospinning
Authors: Teng Yu , Li Yuexiwei , Li Yingjuan , Song Qunling 
Published: June 2020

Abstract
Ferroferric oxide (Fe3O4) magnetic nanoparticles are easily agglomerated due to their large specific surface area, and cannot be uniformly dispersed in polymer fiber matrix fabricated from electrospinning solution. In order to obtain uniform dispersion of Fe3O4 in composite nanofibers, a new method is used by mixing organic precursor of ferroferric oxide iron acetylacetonate (Fe (acac)3) and organic polymer polyvinylpyrrolidone (PVP), then subjected nanofibers through electrospinning and formed ferric oxide/polyvinylpyrrolidone (Fe3O4/PVP) fibers via in-situ calcination at low temperature. The morphology of the fibers and the dispersion of Fe3O4 particles in the fibers were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The crystallization of the magnetic fibers was characterized by X-ray diffraction (XRD). The vibrating sample magnetometer (VSM) was used. The magnetic measurement of the fiber shows that the magnetic nanofibers have better superparamagnetism, which are expected to be used as a drug-loaded magnetic cloth in the field of biomedicine.
A method of sample enhancement based on partial discharge PRPS spectrum
Authors: Tang Qi , Wu Lihui , Luo Rongbo , Li Guowei , Wang Junbo , Li Xiaolong , Yan Shisong 
Published: June 2020

Abstract
In this paper, we summarize the problems existing in the traditional partial discharge PRPS sample enhancement method, and propose a method based on the partial discharge PRPS spectrum sample enhancement, including threshold denoising, noise superposition, data density, data sparsity, phase shift, data enhancement method matrix and so on. It solves the problem that the difficulty of collecting the spectrum of partial discharge cases restricts the application of intelligent algorithms such as deep neural network. The practical application shows that the local partial discharge PRPS spectrum sample enhancement method can effectively enhance the sample size, make the sample distribution uniform and representative, and the deep learning neural network model trained by the sample set has high accuracy and generalization ability for PRPS spectrum diagnosis.
Practical Simplified Computing Method of Natural Vibration Frequency of Cable-stayed Bridge during Construction Stage
Authors: Wang Xingnai , Li Peijian 
Published: June 2020

Abstract
In this paper, the vibration analysis model of the cable-stayed bridge is established by using double-mass method, and the formula for calculating its natural frequency during construction is deduced. On this basis, the formula is simplified to obtain the estimation formula of the natural vibration frequencies of the cable-stayed bridge during construction. The structure analysis software MIDAS Civil is used to establish the three-dimensional finite element model of the cable-stayed bridge of Jinan Qihe Yellow River Bridge to analyse the vibration characteristics of Qihe Yellow River Bridge during the construction stage, carry on the spot tracking of the modal test of the construction phase, and at the same time calculate the frequency by using the double-mass method and the estimation formula. The double-mass vibration model, the natural frequency estimation formula, the finite element method analysis and the field modal test results are compared and analysed. Both the test results and the calculated results show that the finite element method can accurately simulate the actual force state of the bridge, and the double-mass model and the estimation formula provide a more accurate and efficient method for calculating the natural vibration frequencies, which provides reference for guiding design and construction monitoring work of the cable-stayed bridge.
Study on Gold Extraction Process of Printed Circuit Board Based on Thiourea Method
Authors: Deng Chao , Xiang Pengzhi , Liu Longjiang , Huang Yao 
Published: June 2020

Abstract
The printed circuit board is rich in recyclable metals Cu, Au, Ag, Pt, Pb, etc. The precious metals such as gold are extracted from it, which is in line with the concept of resource recycling. In this paper, the theorem method was used to extract gold from waste circuit boards. The effects of reaction time, reaction temperature, theorem concentration, and Fe3 + mass concentration on gold leaching rate were investigated. The results showed that the pH was controlled at about 1, the theorem concentration was 0.12 mol/L, FeCl3 was 0.024 mol/L, the stirring speed was 300 r/min, and the leaching time was 2 h. Under the above conditions, the gold leaching rate reached 90.37 %. The theorem gold extraction method has certain potential application values due to its rapid gold dissolution, low toxicity during leaching, low price, high efficiency, and environmental protection.
Study on Mechanical Properties of Main Girder of Continuous Box Girder Bridge Strengthened By A Cable-Stayed System
Authors: Xu Gangnian , Wang Laiyong , Du Yefeng , Chu Cunji 
Published: June 2020

Abstract
The local stress concentration of the main girder during the tensioning construction of the continuous box girder bridge strengthened by the cable-stayed system is more prominent, which may lead to the sudden damage of the structure. Therefore, this paper studies the key section stress and deformation of the main girder in combination with the real bridge test. The results show that the maximum tensile and compressive stress increase of the main girder appears at the root floor and midspan floor; The tensile action strengthens the compressive stress between the anchorage point of the long cable and the anchorage point of the short cable to the top of the pier, which releases some of the compressive stress across the mid-slab, improves the stress state of the main girder, and improves the shear load of the main girder ability; With the increase of the cable force, the main tensile stress of the web in the anchoring area first increases and then decreases. The lifting amount of the midspan section of the main girder accounts for 20.06% of the total deflection, and the effect of the cable-stayed system on improving the deflection of the main girder is obvious.
Strength analysis of LNG tank container for trains under inertial force
Authors: Wang Zhiqiang , Qian Caifu 
Published: June 2020

Abstract
As transportable pressure vessel, LNG tank container used in trains bears not only the static load, but also inertial load during transportation. The finite element method is commonly used in the design of tank containers subjected to inertial force. In this paper, a finite element model for 1AA LNG tank container was established using the ANSYS software, stress analysis and strength assessment under five load cases were performed for the tank container. The results show that the Mises equivalent membrane stress at the frame is controlled by the inertial force but at the inner vessel, however, it depends on the internal pressure although it may be significantly affected by the inertial force in some cases.
Study on mechanical behavior of new steel members of cable-stayed strengthening system
Authors: Xu Gangnian , Wang Laiyong , Zhang Jianjuan , Dong Xu 
Published: June 2020

Abstract
In the tensioning construction of continuous box girder bridge strengthened by a stay cable system, local stress concentration of steel joist and bracket is easy to be caused. This paper studies the stress and deformation of key section of steel joist and bracket by combining with real bridge test. The results show that the maximum stress of steel joist and bracket is less than the allowable stress. When the tensioning force value is 2.66 times of the completion cable force, the bottom plate first reaches the yield strength, and the stress change law of the bracket is not strong. The mid-span deformation of the steel joist in the early period of tensioning is gentle, and the change in the later period is large. When the tensioning force reaches the completion cable force, the value is about 1/400 of the span. In the early tensioning period, the relative displacement between the steel bracket and the girder is large, but the change in the later tensioning period is not large.
Image recognition based on water hyacinth controlled breeding monitoring equipment
Authors: Feng Zhongao , Pan Fei , Li Yuqi 
Published: June 2020

Abstract
The use of image recognition, designed a kind of intelligent monitoring of water hyacinth growth monitoring device, this device realizes the automatic identification of water hyacinth growth status and scope, through image recognition of collecting water hyacinth images into water hyacinth growth related data, after the data through the Internet of things push to the terminal, to achieve the objective of the auxiliary water hyacinth controlling farming work. The water hyacinth controlled planting and breeding monitoring equipment designed in this project has good practicability and promotion value. It can be applied to water hyacinth controlled planting and breeding and water control project, which can effectively solve the problem of large workload and untimely supervision of water hyacinth, and is conducive to promoting water hyacinth to water control work.
Modal Analysis and Experimental Study of Marine Gear Box
Authors: Liu Renlong , Qiu Binbin , Zhao Jiebo , Cui Hongbin 
Published: June 2020

Abstract
In this paper, the finite element model of marine gearbox is established, using Lanczos method performed the modal analysis of the gearbox system mathematical, the modal frequencies and modal shapes of each order of the box were obtained, and the modal experiment of marine gearbox is carried out. The results show that by comparing the data obtained from the experimental modal analysis with the theoretical calculated values, it is verified that the theoretical analysis values and experimental test values are in better agreement, and the maximum frequency error is 4.04%, the fea model is reliable, thus theoretical model could better reflect the natural vibration characteristics of the box on the marine gear box.
Experimental study on side pole collision and deformable barrier collision of car
Authors: Huang Zhigang , Zhang Bin , Wang Linmin , Liu Cancan , Zhang Xiangle 
Published: June 2020

Abstract
In order to study the characteristics of side pole impact and side deformable barrier impact test, a B-class car is selected to carry out the side pole impact test in Euro-NCAP and side deformable barrier (AE-MDB) test in C-NCAP. The characteristics of body acceleration and dummy injury are analyzed. The results show that compared with the deformable barrier collision, the side pole collision has a greater risk of injury to passengers for vehicle body acceleration, at the same time, the intrusion is greater and local deformation is more serious. In order to reduce the side impact damage, it is necessary to increase the local strength of the body at the side of collision to avoid small area overlapping rigid collision.
Based on the lattice structure of the sandwich structure of 3D printing
Authors: Chen Hantang 
Published: June 2020

Abstract
Lattice structure materials have great advantages in thermal, electrical and optical properties, and as a potential lightweight materials have attracted much attention. The inherent complexity of lattice structure makes 3D printing technology and its manufacturing have a natural junction. One of the advantages of 3D printing is that its flexibility and printing cost are insensitive to the complexity of products, so complex lattice structure has become a hot research direction in the field of 3D printing. In this project, we proposed a new lattice sandwich structure, and further studied its mechanical properties, explored its mechanical properties in three-point bending experiment, and prospected its specific application in engineering.
The principle of fatigue model test for spur gears based on similarity theory
Authors: Zhu Chengli , Wang Xiaofang 
Published: June 2020

Abstract
Spur gear fatigue bench test is an expensive and time-consuming process. Especially for the big spur gears, the installations and measurements of them are usually very difficult. In order to solve this problem, this paper analysed the similarity principles of geometry, contact stress, bending stress, number of cycles and other factors for spur gears. The principle of fatigue model test for spur gears is proposed based on similarity theory. It is the basis of spur gear fatigue model test.
Research on Flexible Job Shop Scheduling Problem
Authors: Li Xiangnan , Liang Xu 
Published: June 2020

Abstract
The adjustment time and processing time of the job on the machine are studied as an independent factor considering the influence of the adjustment time, such as installation and positioning, on the efficiency of production scheduling. A mathematical optimization model of flexible job shop scheduling with adjustment time is established based on minimizing the makespan. The improved genetic algorithm is used to solve the proposed model and achieve rapid optimization of the solution process. The Matlab software platform is used to solve the case. The experimental results show that the model and the improved algorithm are feasible and effective, and could be more effective in guiding the actual production.