bluuebunny/crossref_metadata_2025 huggingface dataset:
Scientific Measurement and Visualization Analysis of International Omni-channel Retailing Research (2011-2020)-Research on Knowledge Graph-Based on Co-word Analysis
Authors: Chen Xiaoxia , Li Zhongbin
Published: April 2021

With the development of digital technologies such as cloud computing, big data, and 5G, omni-channel retailing has become the direction of the retail industry reform. To understand the research context, hot spots, and future development trend of global omni-channel retailing in the past decade and provide a reference for relevant research, this paper collects relevant articles in the WOS database from 2011 to 2020, uses the co-word analysis method to make statistics and analysis on keywords, and uses Bicomb, Spss and Excel software to conduct cluster analysis and strategic coordinate analysis on omni-channel retailing research. The results show that the research on omni-channel retailing logistics and supply chain, the research on omni-channel integration and management, and the research on omni-channel digital marketing and consumer behavior are the three hot areas of omni-channel retailing research. In the future, the mixed methods combining quantitative researches (such as machine learning, artificial neural network, and quantitative model) with qualitative research (such as case research and interviews) can be used from a mixed perspective of consumers and retailers to conduct in-depth research on the operation mechanism and the decision-making mechanism of omni-channel retailing and the interdisciplinary research combining omni-channel and organizational management.
Detection of Hysteroscopic Hysteromyoma in Real-Time Based on Deep Learning
Authors: Zhao Aihua , Zhang Jian , Wang Shixuan , Wang Yan , Zhu Xin , Shen Wenfeng , Wang Wenwen
Published: April 2021

Hysteromyoma is the most common benign tumor in women. By the age of 50, 70% of women have one or more uterine fibroids, and about 30% of them have symptoms and need treatment [1]. In hysteroscopic surgery, doctors’ inexperience and fatigue will reduce the accuracy of hysteromyoma diagnosis. In this paper, a hybrid model based on YOLOv3(YOLO) Network and DCGAN network(DCGAN) is proposed to detect hysteromyoma in real time to assist doctors in diagnosis and reduce subjective randomness. The real-time detection speed of the hybrid model reaches 25FPS, and the accuracy rate reaches 91.73%, which meets the requirements of clinical application and improves the diagnosis efficiency of hysteromyoma.
Experimental research on mechanical performance of the lightweight composite slabs
Authors: Cai Ruiyan , Du Jingjing , Yang Li , Pan Chengsheng
Published: April 2021

Aimed at reliability model in the satellite communication system, the index weight of subjective problem, this paper proposes a method based on entropy weight - the combination of cloud model method, combining the expert’s subjective analysis in the process of modelling and model their own objective data to get a more complete set of index weight, and USES the fuzzy quantitative evaluation method for satellite communication system reliability model of the final evaluation results. The validity and feasibility of the algorithm are verified by an example, and the application of entropy weight-cloud model realizes the uncertain evaluation between the evaluation index and the evaluation level, which provides a new idea and method for the evaluation of the reliability model of satellite communication system.
Experimental study on dynamic and static characteristics of Differential Relay Valve
Authors: Wang Zhe , Li Guangmin , Liu Min , Liu Jun , Hong Yin
Published: April 2021

This study aims to investigate the dynamic and static characteristics of a Differential Relay Valve (DRV). The fact that DRV has a complex physical structure leads to more nonlinear coupling property. Thus, theoretical analysis and simulation are not enough when studying its characteristics. In this article, the static and dynamic performance of a DRV is studied based on a novel test bench with NI Labview platform, and both the input and output gas pressure are detected in real time. The outcomes of the experiment show that both the service brake pressure and the parking brake pressure affect the output gas pressure of the DRV, and determined by the larger one. Moreover, the valve has good dynamical follow-up response performance.
Multi-objective Optimization Based Deep Reinforcement Learning for Autonomous Driving Policy
Authors: Wang Hao , Wang Zhongli , Cui Xin
Published: April 2021

End-to-end autonomous driving approach seeks to solve the problems of perception, decision and control in an integrated way, which can better adapt to the new traffic scene. Due to the diversity of traffic scenes and the uncertainty of the interaction among surrounding vehicles, the design of autonomous driving policy is challenging. Many current methods manually design the corresponding driving policy for different traffic scene, resulting in suboptimal solutions and the maintaining is hard. Most of the existing deep reinforcement learning (DRL) methods can’t work well in the complex urban traffic scenes because of the sensing and simple driving policy. In this paper, to extend the adaptability of the SAC-based method, we proposed to take the multiple sensor data as input, and a VAE network was used to enhance the quality of training data for SAC-based DRL method. A multi-constraints reward function for SAC-based driving policy training is designed, which account for the errors of transverse distance, longitudinal distance, heading, velocity and the possibility of collision. The multiple sensor data include the original RGB image captured by forward-view camera, a 3D LiDAR and the bird’s-eye view map resulted from the perception processing, the mixed inputs could enrich the capability of scene perception. The proposed approach is validated with the multi-vehicle traffic simulation built with CARLA[1]. The results showed that the simulated vehicle could adapt to more challenging traffic scenes, like passing intersections and turning in crowded urban scenes, etc with the driving policy generated by the proposed method, and its performances are obviously outperformed against the existing similar methods.
Constructing the Electronic Countermeasures System Architecture Based on Case-Based Reasoning and Bayesian Inference
Authors: Xu Jia , Chen Jia Jun , Hou Yang Xiao
Published: April 2021

In order to promote the quality of electronic countermeasures system architecture, this paper present a methodology for constructing the electronic countermeasures system architecture based on case-based reasoning and Bayesian inference. The methodology described history cases by CPN model, established the largest similarity case and feasibility space by combining the CPN color set and k-means algorithm, and then proposed the optimizing orderings of variables of Bayesian by the LFS (Legal Firing Sequence) of CPN model and maximum information entropy, learned the Bayesian networks structure by K2 algorithm using the result of orderings of variables. At last, this paper concluded the electronic countermeasures system architecture tactics and discussed the way of reasoning for constructing the electronic countermeasures system architecture.
Implicit generalized predictive control method for high-speed train
Authors: Sun Tao , He Lijuan
Published: April 2021

The running process of the train which can high speed running is a typical nonlinear process, and with the higher and higher velocity of the train which can be driven extremely fast, the characteristics of the nonlinear will be stronger than before, which leads to higher requirements for the design of the “Automatic Train Operation” driving system. Aiming at the characteristics of high-speed train running speed fast, complex operation process and strong nonlinearity, the mathematical model establishment and the speed tracking control method are studied. This article uses a data-driven modeling method. Firstly, the actual operation data of high-speed trains based on traction and braking forces are divided into two parts: traction and braking. Then, the linear models of the traction and braking models of the train, which can be driven very fast, are established respectively. These two models adopt the recursive least square method. Then use implicit generalized predictive control to achieve tracking control of high-speed train speed. The simulation results based on the operating process data of CRH380AL is given that this method can make the requirements that belong to high-speed train operation.
Complex dynamics behavior analysis of a new chaotic system based on fractional-order memristor
Authors: Qi Yongwei , Wu Chaojun , Zhang Qi , Yan Kai , Wang Haohan
Published: April 2021

In this paper, we propose a fractional-order active memristor based on fractional-order calculus, and its characteristics are analyzed. Combined with the new memristor, a fractional-order chaotic system is constructed. We study the complex dynamic behavior of the chaotic system by phase diagram, bifurcation diagram and Lyapunov exponential spectrum. The results show that with the change of fractional order and system parameters, the system will exhibit complex dynamic behaviors such as period, double period and chaos. With the change of initial values, the fractional system also exhibits the multistable characteristics of coexistence of different attractors. The research results show the complex dynamic behavior of fractional-order chaotic system.
On the Asymptotic Expansion of Monomial in Singular Partial Differential Equations
Authors: Zhao Xuan
Published: April 2021

People find that formal solutions to a type of doubly singular ordinary differential equations (systems) summable in a monomial of two variables, and that formal solutions to many singular partial differential equations were multisummable. So summability theory of formal power series in several variables is of great importance to the research of formal solutions to partial differential equations. This enriches the achievements in the research of formal solutions to differential equations. It is a application of monomial summability theory of formal power series.
Detection of False Data Injection Attacks Based on Kalman Filter and Controller Design in Power System LFC
Authors: Zhu Rujun , Huang Chongxin , Deng Song , Li Yichen
Published: April 2021

False data injection attacks pose a great threat to the safe and stable operation of power systems. Therefore, the detection and defense of false data injection attacks in LFC systems is becoming more and more important. First, based on the equivalent model of the LFC system and the Kalman filter algorithm, this paper proposes a false data injection attack detection method; secondly, a robust controller is used to reduce load disturbances according to the operating characteristics of the LFC system; then the idea of switching links is proposed to reduce the impact of cyberattack on the system; finally, MATLAB/Simulink software is used to carry out simulation tests. The test results verify the effectiveness of the false data injection attack detection method and switch link defense method proposed in this paper.
Effective entanglement recovery via operators
Authors: Ming Fei , Shi Wei-Nan , Fan Xiao-Gang , Ye Liu , Wang Dong
Published: April 2021

Entanglement is one of essential quantum resources in quantum information processing, playing an important role during quantum communication and computation. While any system unavoidably interacts with its surrounding environment, this thus will result in decoherence or dissipation effect. With this in mind, a natural question arises: how to recover quantum entanglement under decoherence inducing by the environmental noises. In this work, our attempt is to propose an effective strategy to optimally achieve entanglement recovery. Specifically, we derive a nontrivial condition satisfied by any operation U, i.e.

(

U
⊗
I

)

†

(

U

̃

⊗
I

)

=
f

(

U

)

(

I
⊗
I

)

, which will definitely recover the entanglement of an arbitrary two-qubit system, and more importantly offer an explicit physical explanation towards the intrinsic mechanics of the entanglement recovery. By means of derivations, we obtain the appropriate operational strength to realize optimal entanglement recovery through taking advantage of our proposed methods. As illustrations, we apply some local operations complying with our presented strategy on validly protecting entanglement, including

PT

-symmetry operation, quantum weak measurement and quantum reversal measurement.
Environmental Engineering: Regional Aspects (on the Example of the Krasnoyarsk Territory)
Authors: Kurbatova S M , Aisner L Yu , Volkova A G
Published: April 2021

Environmental pollution has reached dangerous levels in many countries, including Russia. Given the fact that the main source of such anthropogenic impact on nature is production, the question of the impact on the economic sector naturally arises in order to influence the stabilization of the situation with the state of modern ecology. Environmental engineering is such a complex tool. At the same time, several levels of it should be distinguished: national, acting on the whole state and establishing the main, fundamental propositions addressed to all its subjects; regional, taking into account the economic and climatic and natural specifics of a particular region; local, at the level of a specific enterprise. This article reveals some aspects of the regional engineering on the example of the Krasnoyarsk Territory, given that the ecological problem is the most acute for this region, given that the region takes the first places in the Russian Federation (and its individual settlements – in the world) by the level of contamination.
Measuring Effects of Investment Polycentricity on Economic Development of Municipalities’
Authors: Krasnoselskaya D Kh
Published: April 2021

Polycentric matters are becoming popular under spatial agenda and regional policies across developing and advanced countries. Having put the polycentricity concept into normative plans, key shareholders found out fuzzy results in empirical body of experiences which could be explained by territorial heterogeneity, chosen measures, and techniques. The article aims on testing hypothesis whether a polycentric pattern in terms of investments in fixed assets has a positive effect on economic development in municipalities. The bivariate Moran’s indexes were calculated using data on investments in fixed assets and the volume of shipped own production goods, performed works, and services from 2015-2019. Our results showed that investments in fixed assets associated with economic development in different ways due to the presence of assisted regions in examined case study and scattering of investments in fixed assets due to regional disparities. These results might be taken into account while elaboration of new spatial strategies within regions in terms of resource distributions.
Research on Settlement Control of New and Old Highway Roadbed Based on Different Bench Excavation Dimensions
Authors: Gao Yang , Lin Xue , Shi Zhenyue , Wang Qingbiao , Jiang Yanbo , Zhao Xinyue , Wu Kun , Li Xinyuan , Zhang Jie , Zhang Junjie
Published: April 2021

The reconstruction and expansion of expressways is an important means, and how to control the settlement deformation of the subgrade width is an urgent problem to be solved. Step splicing is an effective means to control settlement. Therefore, it is very important to study the size of the steps. Expansion is based on engineering. Through literature research, numerical simulation and other research methods, combined with theoretical knowledge of soil mechanics, the settlement control of widened roadbed in highway reconstruction and expansion is studied, and the following conclusions are obtained: (1) Three different types are studied. The deformation law of subgrade and foundation top surface of step size; (2) A combined subgrade step excavation method is proposed, which provides a reference for similar projects. (3) The method of excavation and splicing of combined subgrade steps was verified, and the correctness of combined subgrade excavation and splicing was verified.
Numerical analysis of stress distribution and deformation and failure characteristics of surrounding rock in coal road excavation
Authors: Yang Liping
Published: April 2021

In order to further provide a basis for determining the reasonable sealing depth of the coal seam drainage hole, based on the geological data of the W33011 working face of Sihe Mine, the FLAC3D numerical simulation software is used to analyze the stress, displacement, and plastic zone of the surrounding coal body after the excavation of the W33011 roadway in Sihe Mine. And the distribution law of vertical stress, horizontal stress, vertical displacement, horizontal displacement and elastoplastic failure characteristics of the coal body around the roadway are obtained.
Preparation and luminescence properties of Ba2Mg(BO3)2:Eu2+/3+ phosphor
Authors: Yao Huifang , Qiu Zhao , Xiong Xiaobo
Published: April 2021

The preparation conditions of phosphor based on Ba2Mg(BO3)2 host was systematically investigated, the effect of reduction atmosphere on the Ba2Mg(BO3)2:Eu2+/3+ phosphor was investigated in detail as well. Eu2+ and Eu3+ ions coexist in the host lattice on condition of CO reduction atmosphere, which results in multiple luminescence centers, therefore the phosphor could be selectively excited by 365 nm, 395 nm UV. The yellow emission intensity at 564 nm was remarkably enhanced when more Eu3+ ions were reduced to Eu2+ ions in atmosphere of H2, but Eu3+ ions were not totally reduced yet. By means of the control of reduction condition, high brightness yellow phosphor Ba2Mg(BO3)2:Eu2+/3+ was prepared accordingly. Color coordinate of yellow phosphor is very close to white light area, this phosphor could be excited by near ultraviolet (UV) InGaN chip, combing with blue light, and applied in white light-emitting diodes (WLEDs).
Research on Drug Molecular Computing Based on Support Vector Machine and Neural Network
Authors: Xu Ruihan
Published: April 2021

With the continuous development of science, a large number of drugs, molecules and genes have been stored in various databases. The relationship between drug like molecules and molecular properties can be identified by computer science methods according to the diversity of compound library, drug molecular characteristics and the differences between different molecules, so as to achieve the purpose of drug screening. In this paper, 300 FBPase inhibitors were selected from previous literatures to convert lC50 into plC50. The whole data set is divided into 236 molecules of training set and 64 molecules of test set. Two machine learning algorithms, namely Neural Network and Support Vector Machine, are selected to construct the prediction model with the training set as the learning object. And the reliability of the model is verified by the test set, and it is applied to the prediction of FBPase inhibitors. The prediction results show that the model is stable and reliable. In addition, the randomization test shows that the current model is not caused by chance correlation. The explanation of the selected molecular descriptors proves that the polarity of the molecule plays an important role in the inhibitory activity of FBPase. The model can provide some useful guidance for drug researchers and can screen ideal drug molecules before drug development.
Study on fire risk assessment for underwater soft rock tunnels based on AHP
Authors: Chen Jie
Published: April 2021

Based on AHP, fire risk of underwater soft rock tunnel was assessed. This study is aimed to quantify risk factors associated with fire of underwater soft rock tunnel, and calculate various risk factors. Assessment target weight through the consistency check of underwater soft rock tunnel was then obtained, and underwater soft rock tunnel fire risk will be comprehensively evaluated by comparing the weight and combining the scores of each risk factor. Suggestions for its weak parts are proposed.
Experimental study on acoustic condensation fog elimination in traveling wave tube
Authors: Liu Chang , Tian Zhangfu , Zhao Yun , Zhou Hefeng
Published: April 2021

Acoustic condensation artificial fog elimination has the advantages of wide application range, good economy, flexible and controllable operation area, and does not affect traffic operation. The characteristics of the fog, the frequency and intensity of the acting sound waves have an important influence on the effect of condensation and fog elimination. This paper studies the influence of the frequency of fog on the microscopic particle size distribution and the change of light transmission in the process of fog elimination from both theoretical and experimental aspects. The research results show that for natural fog conditions with low concentration, the time of pure sound wave action takes several minutes to tens of minutes. Under the condition of high-concentration artificial fog, the anti-fog time can be shortened to tens of seconds. Simulations and experiments have both confirmed that sound waves can significantly promote fog elimination, and there is an optimal frequency between 200Hz-700Hz.
Research on Physical Damage of Outdoor Physical Exercise Based on Environmental PM2.5 Detection
Authors: Yu Wei
Published: April 2021

The components of PM2.5 are complex and changeable and are easily affected by seasons and climate. Prolonged exposure to high concentrations of PM2.5 can easily induce inflammation in the cardiovascular system, respiratory system, immune system, and genitourinary system. In severe cases, it can cause cell mutations to induce cancer. The paper adopts the literature method, from PM2.5, risk perception, public physical exercise behaviour, outdoor environment exercise behaviour differences, etc., in recent years, my country’s public risk perception under PM2.5 environment Review with outdoor exercise behaviour research. Research results show that inflammatory damage, oxidative stress, and immune response caused by PM2.5 are important molecular biological mechanisms that cause human injury in outdoor sports people. The enhancement of human respiratory rate and changes in breathing methods during outdoor sports can cause PM2.5 to cause greater damage to the respiratory system, cardiovascular system, nervous system and immune system of the population.
Numerical study on the influence of foamed copper on flow boiling characteristics
Authors: Shen Yitao
Published: April 2021

Traditional heat dissipation materials can no longer withstand the overheating phenomenon caused by excessive heat flux, metal foam materials provide new solutions for chip heat dissipation and air conditioning due to the superior structural characteristics. In this paper, the tetradecahedron model of the foamed copper was constructed to simulate the heat transfer characteristics of the filled foamed copper channel in the boiling flow process to explore the influence of the foamed copper structure parameters and filling length on the heat transfer characteristics. By changing the filling length of the foamed copper, the polynomial fitting function is solved to the optimum filling ratio of 0.6, and the gas phase rate and the working fluid outlet temperature are both at the optimum value ; Introducing the heat transfer influence factor i, it is obtained that it increases with the increase of PPI and decreases with the increase of ε.
How to Improve the Stability and Durability of Sand Castles
Authors: Wu Haofan , Shen Zhangqin , Zhang Yichi , Wang Xinbao , Zhu Yili
Published: April 2021

On the beach in midsummer, one of the favorite recreational activities for adults and children is to build the castle of the sea sand. However, the castles carefully built by the artists are often ruined by the inflow of waves or rising tides. We built the best 3D model of the sandcastle foundation. Moreover, we found the optimal essential moisture content. Due to the frequent precipitation in summer, our model also provides some reinforcement schemes. we compared the bearing capacity coefficients of several common foundation shapes and obtained the optimal shape on a plane. Then we compared the various indexes of the round table with different stacking angles in the vertical direction. We constructed the evaluation function using hierarchical analysis and then found the optimal stacking angle at the point where the first derivative of the function was zero. When calculating the thickness of the foundation based on a sandcastle with specific gravity, we chose the ordinary column foundation bearing capacity formula as the bearing capacity formula of the circular table foundation. Furthermore, we use this formula to find the corresponding thickness of the foundation in combination with the optimal stacking angle previously obtained.
Analysis of fuel consumption and emission between C-WTVC and PEMS methods of heavy-duty vehicle
Authors: Li Bo , Guo Yong , Xu Junhui
Published: April 2021

The chassis dynamometer and PEMS test implemented on a heavy-duty vehicle,through comparing the working condition, fuel consumption and emissions result,it showed that the engine working area in PEMS test occupy most of the working area under the engine performance curve from 1300r/min to 2500r/min at the medium load. In the C-WTVC cycle the engine usually worked below 1900r/min at medium and heavy load.Thus in PEMS test the fuel consumption and pollutant emissions are higher than them in C-WTVC test,the fuel consumption is 12.54L/100km which is 9.3% higher, the brake specific emission of NOx,PN,CO are 91.0%,38.7% ,78.9% higher respectively.The PEMS test is more practical and convenient for heavy-duty vehicle emission test while has a poor measurement repeatability under the influence of different road conditions.The C-WTVC test cycle has a good measurement repeatability for its fixed condition.
Evaluation of the Implementation Effect of the River Chief System in Huzhou City
Authors: Chen Wenwen , Lili Li , Ji Dandan
Published: April 2021

Based on the objectives and tasks of the implementation of the river chief system, an evaluation system for the implementation of the river chief system in Hu Zhou city was established, which consists of four parts: water pollution prevention and control, water environment treatment, water resources protection and water function improvement. Based on the relevant data of Huzhou city from 2010 to 2018, the implementation effect of river chief system was analyzed. It is found that the implementation effect of the river chief system in Huzhou city shows a well upward trend, but there are still some fluctuations and deficiencies. In view of the future development of river chief system, relevant suggestions for developing a linkage and cooperation mechanism, strengthening the assessment and accountability mechanism and increasing publicity.
Synthesis of metal oxide photoanode with improved photoelectrochemical performance by hydrothermal method
Authors: Wan Lijuan
Published: April 2021

Hematitephotoanodewas obtained through hydrothermal method. The physical and photophysical properties of the hematitephotoanode were investigated by X-ray diffraction (XRD), UV-vis absorption spectroscopy,and the photoelectrochemical performance was also evaluated. In terms of maximizing the photoelectrochemical performances of the hematitephotoanodes, the preparation conditions were optimized. And a possible mechanism was proposed to explain the reason for the improvement ofphotoelctrochemicalperformances.
Study of the stability of the iron oxide photoelectrodeprepared through hydrothermal method
Authors: Wan Lijuan
Published: April 2021

Iron oxidephotoanodewas obtained through hydrothermal method. The morphology of the hematitephotoanode was investigated by scanning electron microscopy (SEM) and the photo-electrochemical stability performance was also evaluated. The photochemical stability of a photoelectrode is crucial pointfor practical application of a photoelectrochemical cell. The photoelctrochemical stabilityper formances of hematite photoanode can be improved by the synthesis method.
Scaling Inhibitor Impact to Corrosion Resistance of J55 mild Steel in CO2 saturated brine
Authors: Zhang Qingbo , Xu Xiaowei , Hua Xueping , Lei Jianyong , Ma Yun , Yu Qingsong
Published: April 2021

The corrosion behavior of the J55 mild steel alloy in CO2 saturated brine have been studied by weight loss technique, potentiodynamic polarization technique and characterization of the corroded surface techniques. The results demonstrate that the corrosion solution is easy to penetrate into the matrix and activate corrosion without scale inhibitor. When the scale inhibitor content was as high as 30 mg/L, the effect of scaling products on corrosion gradually decreased. Adding the corresponding scale inhibitor in the solution was beneficial to slow down the corrosion rate and the possibility of pitting corrosion. The corrosion product film is mainly FeCO3, and with the increase of scale inhibitor contents, the density of FeCO3 was stronger and compact, which could greatly prevent the contact between the medium and the matrix..
The effect of mineral composition in the compound soil of soft rock and sand on special surface area and cation exchange capacity
Authors: Sun Zenghui , Peng Biao , Hu Ya
Published: April 2021

The X-ray diffraction method and gas adsorption method were used to investigate the mineral composition and special surface area of different soft rocks, sands, and composed soil. The results showed that (1) Montmorillonite, kaolinite, potash feldspar, calcite, quartz, plagioclase and illite, constitute the soft rock. Quartz, potash feldspar, plagioclase, calcite, montmorillonite, illite, and kaolinite constitute the soft rock in the Mu Us sandy land. There are several types of soft rocks, and there are some differences in the mineral composition of different types. The highest primary mineral content is 94.6% and the lowest 41%; the secondary mineral content is the highest 59% and the lowest is 5.4; (2) The special surface area of different types of soft rock is quite different, and the special surface area is up to 17.14 m2g−1, the lowest is 3.12 m2g−1, and the average content is 9.98 m2g−1. The cation exchange capacity is up to 7.25 cmol(+)/kg, and the lowest is 3.36 cmol(+)/kg; (3) The fitting formula of secondary minerals and specific decomposition of arsenic sandstone, aeolian sandy soil and composite soil is y = 2.423e0.0871x, and the correlation coefficient R2 = 0.8258. The fitting formula for the exchange capacity of secondary minerals and cations is y = 3.105e0.0348x, and the correlation coefficient R2 = 0.9235.
Application of Serum Free Medium Cultured Vero Cells for the Production of Recombinant Oncolytic Herpes Simplex Virus 2
Authors: Fang Zongyao , Wang Leilan , Zou Zongxing , Zhang Siqi , Zhao Yin , Hu Sheng , Liu Binlei
Published: April 2021

The oncolytic virus, especially the recombinant oncolytic herpes simplex virus 2 (oHSV2), has attracted much attention because of its promising cancer treatment effect. To eliminate animal-derived substances from serum supplemented culture medium, which is an adverse factor for the safety of biological products, this study selected three typical serum free media (SFM) on the market, and successfully obtained three SFM cultured Vero cell lines which could be expanded stably. This work provided a reference for the application of SFM to the production of other biological products or vaccine.
Design Method and Evaluation Criteria on Gyratory Compaction Based Cold-Mixed and Cold-Laid Recycled Asphalt Mixture
Authors: Hu Chao , An Ping , Dong Zhao , Liu Jiuwei
Published: April 2021

Cold-mixed recycled asphalt mixture is widely used due to the advantages of good eco-friendliness, resource conservation, and convenient construction. In order to further improve the mixing ratio design theory of cold-mixed recycled mixture, this paper has presented the research on design method and evaluation criteria of cold-mixed and cold-laid recycled asphalt mixture based on gyratory compaction. Research has shown that fine aggregate and mineral powder adhere to asphalt and exist in the form of agglomeration in the Reclaim Asphalt Pavement (RAP), which will cause the gradation of the milling plan material to decay after extraction. According to the viscosity characteristics of cold mixed asphalt, it is recommended that the mixing temperature of the mixture should be greater than 25°C, the compaction of cold-mixed recycled mixtures is easier to achieve by using gyratory compaction method. The paper proposes a test method to determine the optimal asphalt content based on initial strength and sweep test, and proposes a test method for controlling the strength of the mixture by the number of compactions and the forming temperature, establishes evaluation system of initial strength and final strength of cold-mixed recycled mixture, and corrects the evaluation method of high temperature stability and water stability of cold-mixed recycled mixture. The results show that the cold-mixed recycled mixture has low initial strength, insufficient high-temperature stability and water stability. With the volatilization of the diluent, the strength, high temperature stability and water stability of the mixture have been significantly improved.
In-situ Electrochemical Synthesis of Core-shell Structural NbC@Nb5Si3/Nb Composites in Molten Salt
Authors: Li Hongmei , Nong Zhisheng , Xu Qian , Song Qiushi , Chen Ying , Man Tiannan , Hao Chenguang
Published: April 2021

Core-shell structural NbC@Nb5Si3/Nb composites were synthesized from Nb2O5, SiO2 and carbon in molten CaCl2-NaCl salt by electrochemical reduction. Carbon combined with the reduced metal niobium to form NbC core with a diameter of 40nm, and Nb5Si3/Nb as the metal shell. A strong bonding between NbC and Nb5Si3/Nb is benefit for the in-situ compound. The addition of NbC phase could improve the room temperature fracture resistance and reserve the high temperature strength of Nb5Si3/Nb. In order to better understand the reaction mechanism of the electro-deoxidation process, partially reduced samples were obtained by interrupting the reduction process after different reaction times, and examined by XRD, SEM with EDS and TEM analyses.
Bridge structure safety assessment
Authors: Li Shuo , Song Yaping , Liu Deqing
Published: April 2021

With the passage of time, more and more highway bridges gradually enter the old age, and the safety assessment of bridge structures is particularly urgent. According to the use status of in-service reinforced concrete bridges and the actual problems of highway bridges, the necessity and urgency of this subject research are pointed out. At the same time, it comprehensively analyzes the technical specifications, research and application status of bridge structure safety assessment at home and abroad, and points out the advantages and disadvantages of existing technical specifications and research results in terms of content, methods and applications, and aims at the existing technical specifications and research results. Insufficiency, the main research content of this topic is proposed.
Finite element analysis of rubber material cross specimen based on ANSYS Workbench
Authors: Zeng Lingqi , Zou Huisong , Peng Dongdong
Published: April 2021

The finite element analysis software ANSYS Workbench was used to fit and analyze the Ogden constitutive model, and the effect of the arm seam and its parameters on the stress distribution uniformity in the central test area was simulated and analyzed. The results show that different chamfering radii and the number of arm seams have an effect on the stress distribution in the center test area of the sample. The chamfering radius of 1.5mm in the center test area has a high uniformity of uniform stress distribution and a small degree of stress concentration. As the number of arm seams increases, the uniform stress distribution in the central test area increases slightly. This study can provide a reference for the preparation of standard specimens for bidirectional tensile testing of rubber materials.
Research on Solid Solution Process of High Strength Casting Al-5.0Cu-0.5Mn Alloy
Authors: He Xiaohui , Liu Bin
Published: April 2021

In this paper, hardness testing, metallographic analysis, scanning electron microscope, X-ray diffraction and other methods are used to study the solid solution behavior of Al-5.0Cu-0.5Mn alloy in the range of 0-24h at 500°C-550°C. After different solid solution processes, the micro-structure and mechanical properties of the change law, the following conclusions are obtained: the as-cast alloy mainly consists of aluminum matrix and non-equilibrium eutectic composition, and the non-equilibrium eutectic is distributed in the grain boundary of the alloy in a discontinuous network. So, we get the following conclusions: The non-equilibrium eutectic in the alloy is rich in Cu elements, and its main chemical composition is Al2Cu. The formation of this structure is due to the rapid cooling of the ingot during the solidification process and insufficient atom diffusion.
Study of the Mechanism of Oxalis corniculata (L.) in the Treatment of Hepatitis based on Network Pharmacology
Authors: Ding Qin , Huang Xulong , Yang Xiaosong , Zhang Mei , Qin Ping , Wu Hongmei , Wang Xiangpei
Published: April 2021

Objective: The molecular mechanism of Oxalis corniculata (L.) in the treatment of hepatitis was studied by network pharmacology. Methods: The active ingredients of that were screened using network pharmacology. The “drug-active ingredient-target-disease” network was constructed. The signal pathway and biological process of the target was analysed by DAVID database. Results: Screen out 8 active compounds and 30 potential targets, the target proteins are TP53, AKT1, ALB, and IL6, respectively. 42 biological processes and 39 signaling pathways were screened. It exerts anti-hepatic effects by regulating signaling pathways (such as cancer pathways, hepatitis B and PI3K-Akt signaling pathways). Conclusion: Network pharmacology provides new ideas and methods for revealing the anti-hepatic mechanism of Oxalis corniculata (L), and provides scientific basis for further research and development of Oxalis corniculata (L).
Synthesis of cathode material with different dosage of maleic acid-leachate of spent lithium-ion batteries
Authors: Sun Liuye , Liu Borui , Wu Tong , Wang Guange , Huang Qing
Published: April 2021

In this paper, LiNi1/3Co1/3Mn1/3O2 cathode materials were synthesized by sol-gel with different dosage of maleic acid-leachate of spent lithium ion batteries (LIBs). Electrochemical performance test was performed on the re-synthesised materials to explore the effect of leachate dosage. The results show that the degree of Li+/Ni2+ mixing increased while initial discharge capacities and capacity retention decreased significantly with leachate dosage increasing. Therefore, the leachate dosage is preferably 65% which can achieve a win-win situation in economy and performance when the LiNi1/3Co1/3Mn1/3O2 cathode materials were synthesized with maleic acid-leachate of spent LIBs in our work.
Research on The Deep Hole Processing of Aramid Fiber Reinforced Composites
Authors: Jin Lei
Published: April 2021

Aramid fiber reinforced composite is a new material with high strength and low density, which is widely used in weapon, automobile, aerospace and other fields. The material is difficult to process, drilling is the main processing method of the material. In the drilling process, it is easy to appear fluff, ablation, stratification and so on. As a result, it is difficult to guarantee the quality of traditional processing and seriously affects its performance. In this paper, the drilling force and temperature in the drilling process are studied, and the influence of temperature and force on the processing quality is analyzed, so as to provide reference for the low-damage processing of aramid fiber reinforced composites.
Research Progress of Improved Methods of Zero-valent Iron
Authors: Wang Luyao , Peng Biao , Qu Shaodong
Published: April 2021

It has been found that ZVI is cheap and readily available, environmentally friendly, highly active, thoroughly removed, and has a wide range of applications. It can remove a variety of environmental pollutants in wastewater, surface water, groundwater, and drinking water, such as organic compounds, heavy metals and metalloids, oxygen-containing anions. It has been found through research that the activity of ZVI can be improved in various ways. This paper summarizes the research progress of various methods such as ZVI pretreatment, ZVI and material coupling method, UV assisted method, weak magnetic field method, aeration method and particle size reduction, which in order to provide new ideas for the theoretical research and application of ZVI.
Research and analysis of maximum likelihood recursive identification algorithm based on physical exercise behavior of obese children
Authors: Zhao Huoping , Wang Dong , Li Dahu , Sun Kang , Zhang Wanjun , Gou Xiaoping , Zhang Feng
Published: April 2021

With the decrease of physical activity, children’s health problem will become an urgent problem in building a well-off society in an all-round way. There are differences in the safe heart rate of children with different physique when they exercise.This paper studies the suitable heart rate of children with different physique. Based on a maximum likelihood recursive algorithm for obese children’s physical exercise behavior, a model recognition system based on the maximum likelihood recursive algorithm for obese children’s physical exercise behavior is established. Finally, through MATLAB simulation analysis, the results show that fat the model recognition of MLR algorithm is consistent with the actual results, and the simulation results verify the feasibility and effectiveness of MLR algorithm.
The influence of stiffness coefficient of steel support on supporting effect and its optimization
Authors: Zhang Jie , Li Yue , Zhao Xinyue , Shi Shenyue , Liu Wenxia , Lin Xue , Chen Junsheng , Zhao Yinghao
Published: April 2021

The stiffness coefficient of steel support plays an important role in controlling the deformation of foundation pit, but the influence of various parameters in the stiffness coefficient on the supporting effect of foundation pit is still unclear, resulting in the unreasonable value of the stiffness coefficient. By means of theoretical analysis and numerical simulation, this paper makes a comprehensive and in-depth study on the influence law and optimization of the stiffness coefficient of steel support on the supporting effect. Based on the calculation of the stiffness of steel support, the calculation formula of the stiffness of steel support under the uniform radial load is derived by using the basic definition of stiffness calculation; the change rules of horizontal displacement and surface subsidence of the support structure under different parameters were analyzed by numerical simulation method, and the original scheme was optimized. The results show that: (1) in the stiffness coefficient, the steel support spacing and wall thickness have a great influence on the supporting effect; (2) with the increase of the rigid support spacing and the decrease of the steel support wall thickness, the horizontal displacement value and surface settlement value of the support structure both become larger. However, when the steel support spacing is 3.00-3.10m and the steel support wall thickness is 14mm-16mm, the horizontal displacement value and surface settlement value of the support structure do not change much, and they are all within the monitoring and warning value; (3) the original design scheme was optimized from 3.00m steel support spacing and 16mm steel support wall thickness to 3.10m steel support spacing and 14mm steel support wall thickness in the original scheme, which reduced the engineering cost and improved the construction efficiency.
Analysis on Sealing Mechanism of Casing Connection
Authors: Hao Long
Published: April 2021

This article describes the sealing mechanism of API casing thread connection and premium casing thread connection, and determines that the main macro factors affecting the sealing performance of premium thread connection are surface quality, contact pressure and contact width of sealing surface. The influence law of these three factors on sealing performance is discussed. The analysis results in this paper can provide the theoretical ground for improving the sealing performance of premium thread connection.
Plasma Preparation and Modification of Multi-Component High Polymer Molecular Nanocomposites
Authors: Wang Wei
Published: April 2021

Low-temperature plasma belongs to non-thermal equilibrium plasma, which has higher electron temperature and lower gas temperature, so it is a new method for preparation and modification of nano-catalysts. Low temperature plasma has attracted wide attention in the preparation and modification of nano-catalytic materials because of its high efficiency, environmental friendliness and easy functionalization of materials. It shows outstanding advantages in the unconventional preparation, doping, defect and vacancy manufacture of nano-catalytic materials, so it is widely used in the preparation and modification of all kinds of catalysts. This paper mainly reviews the research progress of low temperature plasma in the preparation and modification of oxygen reduction, oxygen evolution, hydrogen evolution and fuel oxidation catalysts, and expounds the reasons for the performance improvement of these catalysts from different angles. The challenges of low temperature plasma in the preparation and modification of nanocatalysts are summarized, such as relatively high cost, reactor amplification, material controllable preparation and so on. Finally, the development trend of plasma preparation and modification of nanocatalysts is predicted.
Rigid flexible coupling dynamic analysis of piezoelectric jetting dispenser based on ADAMS
Authors: Li Guang , Zhou Can
Published: April 2021

As dispensing technology needs accurate flow control, high performance spray dispensing has become the mainstream of dispensing technology. In this paper, the rigid flexible coupling dynamic simulation of piezoelectric jetting dispenser is carried out by using the dynamic simulation software ADAMS. In this process, the displacement and velocity of the needle under certain conditions are obtained. Then, according to the simulation results, the jetting dispenser driven by piezoelectric stack and the experimental test system are established. The dispensing process of the piezoelectric jetting dispenser is studied. The displacement of the needle in the dispensing process of the piezoelectric jetting dispenser is obtained by laser sensor, and the needle speed is obtained by analyzing the displacement of the needle. The experimental results are in good agreement with the simulation results, which proves the accuracy and feasibility of the simulation, and provides a method for the design and research of piezoelectric jetting dispenser.
Preparation and Optical Properties of CaAlBO4:Eu3+Phosphor
Authors: Wen Yan , Li Zhisen , Chen Dai , Man Shiqing
Published: April 2021

A series of single-phase CaAlBO4: Eu3+ powder samples were synthesized by high-temperature solid-phase method, the main factors are temperature, time, concentration of rare-earth ion, etc. The results show that the maximum emission peak of the sample is located in the wide band spectrum of 467 nm, and belongs to the 4f65d to 4f7 transition of Eu3+. The maximum absorption peak is located at a narrow band of 678 nm. by a study of the relationship between the doping amount of Eu3+ and the luminescence property of the sample, The optimum doping content of Eu x 3+(x = 0.0025)