bluuebunny/crossref_metadata_2025 huggingface dataset:
FSEC Racing Car Handling Stability Analysis and Optimization
Authors: Wu Siyu , Pan Jialun
Published: May 2021

In this paper, the whole vehicle virtual prototype of the E22 pure electric formula racing car of Wuhan University of Technology for the 2020 season is built with the help of vehicle dynamics simulation software VI-CarRealTime tool, using multi-body dynamics as the theoretical basis. The suspension system of the vehicle is optimized. The steady-state steering characteristics of the car were analyzed through the simulation results of the virtual working conditions, and the four-wheel positioning parameters were optimized and matched to the specific working conditions. The optimized and matched car makes the steering characteristics of the car more consistent with the handling habits of the team’s drivers, improves the handling stability of the car, saves the optimization cycle for the whole car design process of the university’s formula car, and provides a reference for the design and optimization of the FSEC car.
A New Solving Method of the Athermal Bonding Thickness in Lens Mount
Authors: Huang Jianhua , Chen Yi
Published: May 2021

Adhesives are widely used in the design of optical and mechanical structures. For optics fixed by adhesive bonding, the mismatch of the thermal expansion coefficient of the materials among the lens, the adhesive layer and the frame will bring thermal stress in the radial direction of the lens, which will affect the imaging of entire optical system. Studies have shown that by changing the thickness of the adhesive layer can reduce or even eliminate the radial stress caused by temperature changes, so it is critical to obtain the thickness with low(zero) radial stress. Based on the derivation of the existing athermal bond thickness equation, this paper proposes a new bonding layer constraint condition assumption, introduces the thermal expansion coefficient scale factors k1, k2, and derives a novel athermal bond thickness equation. Then, using the finite element method, the thermal stress simulation analysis of two adhesive lens assemblies with different count materials is solved, by comparing the simulated value with the analytical solutions, it’s found that the errors of both are within 10%, which shows that the newly derived equation has sufficient accuracy to meet the needs of engineering application.
A novel End-effector Finger Rehabilitation Robot (EFRR) for stroke patients
Authors: Hongbo Wang , Yu Tian , Baoshan Niu , Jiazheng Du , Junjie Tian
Published: May 2021

This paper proposes a prototype of a novel end-traction finger rehabilitation robot with flexion/extension and adduction/abduction functions. The degree of freedom (DoF) and finger joint torque of a single-finger module has been analysed, and the calculation and selection of the motor driving force are completed. Finally, the design details of the mechanism and the hardware system of the robot are illustrated. This device minimized the mechanical size to some extent by using only one motor for a single finger, which also reduces the cost and increases the possibility of industrial application prospects.
Terrain Pre-process the Lower Reaches Yellow River and Delta Estuary Coast of Two Dimensional Numerical Model
Authors: Ma Liangchao , Jiang Caodong , Li Dongfeng , Zhang Hongwu , Li Zihao
Published: May 2021

Mike21 is a professional engineering software package for simulating the flow, wave, sediment and environmental problems of rivers, lakes, estuaries, bays, coasts and oceans. The pre-processing of the terrain in the study area is an important foundation for constructing the Mike21 model. In order to improve the calculation accuracy of the Mike21 model, taking the lower Yellow River estuary channel and the Bohai Bay area as an example, the use of Google Earth satellite images and the AutoCAD topographic map to extract the terrain boundary is discussed, and the terrain interpolation problem in terrain pre-processing is discussed. The two terrain pre-processing methods can effectively improve the terrain pre-processing efficiency and make the terrain processing result file more realistic.
Design of a multifuntional nursing wheelchair
Authors: Gao Han , Tang Yuanze , Wang Zhiwen , Wu Qing
Published: May 2021

This paper designs a wheelchair with multi-function nursing ability. With Raspberry Pi as the main control board, it has functions such as assisting in getting in and out of bed, term inal monitoring, intelligent risk avoidance. It also has the ability of rehabilitation training for th e elderly with stroke or similar conditions, to prevent muscle atrophy and other problems cause d by long-term inability to exercise independently. Finally, the lightweight aluminum profile m aterial is used as the main body to complete the prototype production and function verificatio n. The prototype test shows that this new type of intelligent nursing wheelchair has a reasonabl e design, and the integration of multiple functions has brought great convenience to the caregiv ers and users. It has the prospect of large-scale promotion and marketing.
The effect of sensor noise on structural modal parameter identification
Authors: Li Shuai , Wang Ting , Zhao Yang , Deng Congying , Li Xinghong
Published: May 2021

When errors occur in the sensor networks, there are noise in the acquired data. In this paper, based on the response correlation function between two points of the structure, the least squares complex exponential method is used to identify the influence of noise on the structural modal parameters. Through the construction of the steel beam platform experiment, the experiment verifies the influence of the noise in the collected data on the recognition of modal parameters. The results show that when there is noise in the collected response data, the noise component will cause errors in the identification of structural modal parameters, and the lower the modal order, the more sensitive the noise level.
Research of Intelligent Campus Design Based on Immersive BIM + VR Technology
Authors: Wu Bei , Wang Yaning , Liu Ruiqi , Tan Shiye , Hao Ruoyan
Published: May 2021

With the maturity of virtual reality technology, more and more domestic colleges and universities have introduced virtual reality technology into the construction of the intelligent campus, establishing vivid and real three-dimensional virtual campuses, and achieving the goal of campus information, intelligence and visualization. This topic mainly studies the construction process of the smart campus based on BIM + VR technology. Taking the university buildings as the research area, the whole process from basic modeling to content innovation is discussed in detail. The VR smart campus is successfully established, and the innovative application of VR smart campus and campus sightseeing and VR fire simulation escape is realized.
Application of Compressed Air Energy Storage in Urban Buildings Energy Supply
Authors: Wen Xian-Kui , Zhang Hong-Fu , Li Zhi-Lin , Zhong Jing-Liang , Yang Da-Hui , Feng Ting-Yong
Published: May 2021

Urban buildings consume a lot of energy every year. Through analyzing the characteristics of urban buildings energy supply and compressed air energy storage (CAES) and considering the electric energy, thermal and cold energy output from CAES, this paper constructs the overall framework of CAES providing urban buildings with combined cooling, heating and power (CCHP), which can meet the energy demand of urban buildings, improve the system efficiency of CAES, make profit from the peak and valley electric charges difference of power grid, and it also has a broad range of popularization and application.
Failure Characterization and Analysis of Sub-module of Press-Packed Devices in High Temperature Reverse Bias Test
Authors: Ma Hao , Wang Zhenshuo , Li Xuebao
Published: May 2021

The failure of sub-module of press-packed devices in course of high temperature reverse bias (HTRB) test was investigated in this paper. A high temperature reverse bias test platform for press-packed devices was built, which was capable of monitoring and collecting continuous leak current data of devices during the test. Through the analysis of the static characteristics of the chip before and after the high temperature reverse bias test, a method that uses the combination of IV and CV characteristic curves to characterize high temperature reverse bias failure was proposed. By means of finite element analysis to locate the reasons for the change of static characteristics, the accumulated charges around the terminal of chip were considered to be the primary source for the failure of sub-module under the HTRB test.
Action-Improved Actor-Critic Tracking for Accurate Object Tracking
Authors: Hu Yangrun , Wu Ruikang , Gu Yanjun
Published: May 2021

Visual object tracking is a fundamental problem, which tracks the target in the whole sequence with the given object in the first frame. Numerous tracking frameworks have been proposed. Actor-Critic Tracking (ACT) is based on RL, which is a popular framework with real-time speed. However, ACT cannot handle scale estimation effectively, since it cannot change the ratio of target size. In this paper, we aim to improve the scale estimation of ACT and propose the Action-improved ACT(AIACT) model. This work is based on the basic framework of ACT. ACT builds the ‘Actor’ deep neural network to track the target and the ‘Critic’ network as an inspection module to improve the model. We add a new element to the bounding box of ‘Actor’ model to change the aspect ratio. The experiment result shows that our model achieves better accuracy than the previous model. Our method achieves 0.646 and 0.912 score of success rate and precision rate on OTB dataset, which means AIACT model can handle the scale variation of the target. Therefore, it will benefit more applications.
A Survey on Newmann’s proof of the prime number theorem
Authors: Ma Zhentao
Published: May 2021

The prime number theorem is one of the most important theorems in number theory, which tells the asymptotic behavior of positive prime numbers. It was first proved independently by Jacques Hadamard and Charles-Jean de la Valĺee Poussin in 1896, by using the Riemann zeta function as a tool. We summarize Newmann’s proof in this survey.
Modeling and Optimizing Method for Charging Route Planning of Wireless Rechargeable Sensor Network
Authors: Bai Jin , Tan Hongyu , Yi Yang , Wang Jieyi
Published: May 2021

Wireless rechargeable sensor network consists of a data center, several sensors and one or more mobile chargers. In order to make the wireless rechargeable sensor network (wrsn) work normally, the mobile charger needs to charge the sensor regularly to avoid its power below the threshold. The energy consumption of mobile charger will be caused when charging sensor nodes and on the way of charging sensor. In this paper, how to reasonably plan the charging route of the mobile charger and reduce the energy consumption of the mobile charger on the road are modeled. By comparing the Monte Carlo optimization simulated annealing algorithm with the improved genetic algorithm, the TSP traveling salesman problem with the minimum energy consumption of the mobile charger on the road is solved.
Iterative Method for Positive Definite Solution of a Class of Nonlinear Matrix Equation
Authors: Xiong Hao , Huang Jingpin , Zhang Shanshan , Wang Yun
Published: May 2021

In this paper, we study the matrix equation X+A

*

(R+B

*

XB)

-t

A=Q (0<t⩽1), where A, B, R, Q are matrices of appropriate size and R, Q are both positive definite matrices. Based on the fixed point theorem, we suggest four iterative algorithms for solving this equation and prove that the suggested iterative algorithms are convergent with proper conditions. What’s more, the conditions for the existence of the positive definite solution are given. The convergence analysis of the suggested algorithms is established. Some numerical examples are presented to illustrate the convergence behaviour of the various algorithms.
Influence of Training Times and Sample Size on Results in Visual Try-On with GAN
Authors: Jiang Wenqing , Qi Ruiyu , Zheng Juntao
Published: May 2021

With online shopping becoming more and more trendy these days, Virtual Try-On Approach is proposed. It is a method of Generative Adversarial Network (GAN) composes of two models: Geometry Matching Module (GMM) and Try-On Module (TOM). It is proposed to solve the inconvenience of customers for not being able to see the fitting effect before receiving the goods. This paper is about finding the relationship between dataset and the effect of the experiment in the GAN experiment. After implementing the models and gaining the result images, we do some observations on the GMM one and try to analyze it and improve the effect. Comparison is made on different aspects: training times of the model and sample size of the training input. Similar trends are shown on the decrease of loss value when the training times or sample size rises. However, the visual effect is not necessarily improved all the time. Compared with the times it has been trained, the improvement from training times is far less than that from the sample size. Finally, we draw the conclusion that the effect is gradually improved as the training times or sample size increases at the beginning. Nevertheless, the improvement cannot be recognized evidently when the training times and sample size have grown large enough. Additionally, the sample size seems to be a more significant factor in the improvement of the visual effect than the training times.
Fire emergency evacuation model of light rail station based on BIM technology
Authors: Diao Yuyu , Guo Zhida
Published: May 2021

Urban light rail undertakes the mission of escorting passengers to arrive safely. Once a fire accident occurs, it will inevitably have a great negative impact. Therefore, how to effectively carry out emergency evacuation tasks in fire accidents has become one of the problems facing the development of urban rail transit. Based on this, this article first introduces the relevant characteristics of BIM technology and the corresponding advantages, and further its use in urban light rail stations. The application advantages of emergency evacuation strategies are briefly analyzed; then the requirements for the construction of BIM emergency evacuation models are studied; finally, through field investigations, a specific urban rail transit light rail station is taken as an example to construct a BIM building information model for this light rail station. Applying BIM technology to fire protection work in light rail stations, it is expected to improve the efficiency of emergency evacuation of passengers in light rail stations.
Improved artificial bee colony algorithm based on damping motion and artificial fish swarm algorithm
Authors: Zhang Liyi , Fu Mingyue , Li Hongbo , Liu Ting
Published: May 2021

The basic artificial bee colony (ABC) algorithm is easy to fall into local optimum, and it has poor exploitation ability and slow convergence speed. According to the defects, the improved algorithm is proposed, which is based on damping motion and artificial fish swarm(AFS) algorithm. In the employed bees phase, the swarm behavior of AFS algorithm which can avoid sinking into local optimum is introduced. At the same time, considering the slow convergence speed, employed bees adopt the multidimensional updating process in the early stage of iteration. In the onlooker bees phase, an adaptive step size based on damping motion is designed to replace the random step size, which can balance the global exploration and the local exploitation. Through the simulation of six test functions, we get the average convergence algebra, the mean, the best and the variance of the optimal solution through 30 experiments. Simulation shows that the improved algorithm has a better performance than the basic one.
Morphological description and statistical characteristic simulation of cocoon filament size curve
Authors: Yang Pengmin , Ning Wane , Huang Jiwei , Ge Guoping
Published: May 2021

Computer simulation of silk reeling is an important means to understand structure and formation of raw silk, and simulation to generate cocoon filament size curve is the premise of computer simulation of reeling silk. In this paper, according to unique pattern of cocoon filament size curve that is “thin-thick-thin, the last part is the thinnest”, a simulation and generation method of cocoon filament size curve with adjustable morphological is obtained by analyzing the characteristic point values and statistical data of cocoon filament size curve, such as head end size, maximum size and its position on cocoon filament, length of cocoon filament. Through a lot of simulation practice and analysis on statistical characteristics of cocoon filament size curve, it is considered that the proposed generation method has good applicability.
Analysis of Image Generation by different Generator in GANs
Authors: He Jiabei , Nie Yuzheng , Mao Ziwen
Published: May 2021

GAN is very useful in the field of image generation. Many related GANs have been proposed for generating images from the description. However, the research about analysis of image generation by different Generator in GANs is still insufficient. In this paper, different methods such as CNN and Resnet are used as the Generator in GANs for image generation. The subjective evaluation is used to analyze the performance of different generators of GAN. The result shows that the CNN-based generator performs better than the Resnet-based generator. And the increase of the number of parameters in the model will change the image quality. The analysis of different methods as the generator in GAN has a great referential significance in the field of image generation.
Modelling Study on Acetylcholine Regulation to the Pacemaker Ability of the Sinoatrial Tissue in Hearts
Authors: Zhang Hong , Ma Liyuan , E Junliang , Yang Zhao
Published: May 2021

As an important neurotransmitter, acetylcholine (Ach) is closely related with dysfunction of sinoatrial node (SAN), but many questions about its effects on electrophysiological behaviors of SAN are still unclear. In this paper based on the dynamic model of rabbit SAN and atrial cells while considering Ach activated inward rectifying K+ current, other Ach-adjusted ionic currents, and heterogeneity of SAN as well, a two-dimensional tissue model was developed. Computer simulation studies found that slowing of the firing rates caused by Ach could reach above 300%. Upstroke velocity of the central cell is over 3 times greater than that of the peripheral cell, thus presenting more sensitivity to Ach and easier property of sinus pause. Additionally, when Ach distributed nonuniformly, the leading pacemaker site would shift to where the maximum concentration gradient of Ach was. Moreover, the reentrant wave produced at atrial tachycardia could invade into the SAN and suppress its spontaneous firing. The greater the Ach concentration, the easier the suppression is.
Investigating the effects of corporate social responsibility on financial performance
Authors: Zhang Zhenfei
Published: May 2021

This paper assesses the relationship between corporate social responsibility activities (CSR) and financial performance as well as how CSR affects the financial operations of companies of all types. Over the last decade, the world has made remarkable achievements in its economy, which provide more fertile soil for a variety of companies to thrive even in fierce market competitions. However, the planet’s finite resources and a heightened citizen awareness also called for corporate social engagement rather than the pursuit of profit maximization. Therefore, this paper leverages recent CSR scores and the latest financial data of the top 300 companies on the CSR index list, and provides statistical evidence on the positive role of CSR activities in corporate performance. This paper is also expected to generate fresh insights into future academic research and CSR strategies.
An improved non-contact geometric parameter detection method for high-speed railway catenary
Authors: Ju Yanjie
Published: May 2021

In order to improve the accuracy and anti-interference of non-contact geometric parameter detection of high-speed railway catenary, the geometric detection algorithm is modified, and an improved non-contact geometric parameter detection method of catenary is proposed. The image edge enhancement and noise filtering are realized by using the enhancement method based on curve transformation, and the image edge is accurately extracted by using SUSAN algorithm. At the same time, considering the influence of vehicle vibration, the vehicle vibration compensation correction is added to improve the accuracy of geometric parameter detection. The results shows that compared with the traditional geometric detection method, the anti-interference and accuracy of the improved algorithm have been improved, which has good practical application value.
Equilibrium Queueing Strategies of Three Types of Customers in A Single Queue
Authors: Jia Guowei , Lu Xiaotao , Song Yuantao
Published: May 2021

Different types of customers have different revenue and waiting costs per unit time. Although in queuing economics, research on customer equilibrium strategies has achieved fruitful results, most of these are based on a single customer type. Research on multiple types of customers is rare. We consider a single queue with three types of customers. We analyse system stationary distribution and obtain the equilibrium balking strategy of each type customers. In addition, the social benefit is discussed under the reward-cost structure in the full observable.
The Effect of Electroosmotic Flow on the Dielectric Assembly of Nanowires
Authors: Du Shan , Ding Haitao
Published: May 2021

The assembly of nanowires is important to the manufacture of microelectronic components, and dielectrophoresis is a method of assembling nanowires with low cost, good operability, accurate positioning and high assembly efficiency. In this paper, a model of the dielectric assembly of nanowires in the microelectrode system is established, and the dielectrophoretic force and electroosmotic flow of the nanowires are analyzed, and the regulations of the dielectric assembly of nanowires is obtained. Based on the preparation of planar microelectrode pairs, the nanowire dielectric assembly experiment was performed. Through the analysis of the experimental results, the regulations of nanowire dielectric assembly are consistent with the simulation.
Traffic accident analysis and Control Countermeasures of fatigue driving on Expressway
Authors: Sun Yan , Tang Zhihua
Published: May 2021

In the current high-speed accidents, there is a great cause of fatigue driving. This paper first analyzes the law of fatigue driving accidents on expressways, including time distribution, type distribution and other distribution characteristics of accidents in various states. Secondly, it investigates the sections with heavy traffic accidents and frequent accidents, so as to analyze and find out the unreasonable and deficiencies. Finally, it summarizes the shortcomings of expressway, combined with the fatigue driving accidents caused by human subjective factors, suggestions and improvements are made. Through this study, for the prevention of fatigue driving accidents, drivers need to improve their safety awareness, family supervision and social supervision is very important, and after the accident, we need to correctly handle the results of the accident.
Mask Wearing Detection Method Based on the Skin Color and Eyes Detection
Authors: He Tengjiao
Published: May 2021

During the period of fighting against COVID-19, wearing masks is the main measure of protection in public places. In order to obey relevant regulations, railway stations, airports, shopping malls and other public places are equipped with staff to supervise citizens to wear masks. This method not only wastes human resources, but also has the disadvantage of significantly reducing the efficiency when the flow increases. In order to improve work efficiency, save human resources, and ensure the health and safety of staff, computer vision technology can be used to develop embedded device to deal with the task of automatic mask wearing detection. This paper proposes a mask wearing detection method based on the skin color and eyes detection. This method uses the ellipse skin model, the grayscale gradient features of eyes and the geometric relationship between eyes and other parts of face to locate the face region. And by calculating the coverage of skin color in nose and mouth area, this method gives a judgement of whether a man is wearing a mask properly. This method can basically deal with the task of mask wearing detection under the specific application scenario. It also has the advantages of small volume and strong interpretability.
Research on Cutting-Stock Method of Profile
Authors: Li ShuiPing , Cai WenHui
Published: May 2021

There is a lot of waste of profile materials in the production process of aluminium alloy doors and windows manufacturers, and the cost of profile materials occupies a large proportion of the manufacturing cost of aluminium alloy doors and windows. According to the traditional aluminium alloy door and window manufacturers in the cutting-stock process, the problem of waste of profiles, confusion of cutting orders, low automation and low production efficiency, etc., we proposed a cutting-stock algorithm that selects different cutting-stock algorithms for different cutting-stock order sizes. We used improved linear programming method to solve the small-scale cutting problem, and limited the number of cutting methods of the profiles, and used LINGO software code to solve it. The hybrid genetic algorithm is used to solve the one-dimensional large-scale order placement problem. It is concluded that the algorithm improves the utilization rate of the profile, improves the production efficiency of the enterprise and decrease the cost of the enterprise.
Theoretical modeling and analysis of piezoelectric energy harvester with variable section overhanging beam
Authors: Liu Shuang , Mao Jiajia , Zhang Wei
Published: May 2021

With the development of integrated circuits, the volume and power consumption of electrical equipment have decreased dramatically. As an excellent energy conversion method, piezoelectric energy harvester can capture the vibration energy of the environment, so as to realize the self-powered supply of micro and small power electronic devices. In this paper, a variable cross-section extended beam structure is considered as the structure form of piezoelectric energy harvester. The influence of structural parameters on the steady-state response of piezoelectric energy harvester is analyzed, which can improve the output voltage and collection efficiency of the energy harvester. The results show that the thickness of the beam has a great influence on the natural frequency of the piezoelectric energy harvester system, but has little influence on the output response. By changing the thickness of the beam, the low-frequency energy can be captured and the energy collection efficiency can be improved. The thickness of the beam piezoelectric layer has a great influence on the natural frequency of the piezoelectric energy harvester system, but has little influence on the output response. By reducing the thickness of piezoelectric layer, the efficiency of energy collection can be improved.
Feature Analysis of Fractal Surface Roughness Based on Three-dimensional W-M Function
Authors: Zhang Bao , Zhou Laihong
Published: May 2021

The three-dimensional W-M fractal function was used to simulate the rough surface, and the different fractal parameters correspond to the different surface morphology. In order to explore the influence rule of fractal dimension D and scale coefficient G on the surface profile, the fractal dimension D value was 2.5, and the scale factor G value was 1E-14. The mean height, standard deviation and spectrum characteristics of the surface contour were analyzed. The results show that under the action of a single fractal parameter, the surface roughness Ra
and the surface contour height standard deviation std all decrease with the increase of D, and increase with the increase of G, and the change trend is basically the same. When D is kept constant and only G is a variable, the surface height value of frequency components remain unchanged, the amplitude of each frequency decreases with the decrease of G; G remains unchanged but only D is a variable, with the increase of D, the frequency amplitude changes slowly, and the amplitude decreases.
Application of nanomaterials-based optical sensors for virus detections
Authors: Shi Jiahao (Carl)
Published: May 2021

Contemporarily, the spread of virus has occurred in everywhere, which affect not only individual’s health but also society in the aspects of social relationships, cultural events, and families. In order to control the spread of the viruses, the rapid and accurate detection approach is crucial. Identified viruses with optical sensing techniques provides a rapid and effective judgement approach in the early diagnosis of patients. The review outlines the application of optical sensors based on nanomaterials for the detection of different viruses, e.g., colorimetric sensors, fluorescence sensors, and surface-enhanced Raman scattering (SERS) sensors. The substantial performances of these optical sensors including high sensitivity, high selectivity as well as high stability are also summarized. Moreover, besides virus recognition, the demonstrated virus optical sensors could also be widely used in detecting heavy metal ions, organophosphorus compounds, small drug molecules, tumor markers, cancer cells, etc.
Tobacco leaf redrying System Control based on Predictive Auto-Coupling PID
Authors: Xie Junli , Jia Zhiwei
Published: May 2021

Temperature and moisture content in the process of threshing and re-drying can be defined as the same type of object, which is large time-delay with strong coupling. According to the present control strategy, the tobacco leaves control object (temperature and moisture content) occurs with large fluctuations due to the existence of uncertain disturbances. Therefore, the quality and reliability of the production is not good enough to keep the clients around. In order to improve the quality of export tobacco leaves. In this paper, Predictive Auto Coupling PID(PAC-PID) control algorithm is used to design controller for tobacco temperature and moisture content. The simulation results denote that the proposed method can smoothly track the desired signal with fast speed and high accuracy. Meanwhile, the control effect is better than the existing methods. We apply the control method to the actual production, the control effect shows that the stable time of the system is less than 16s, in the same time, the moisture content deviation of export tobacco leaves can be controlled within 1.5%. It means that the method can meet the actual production requirements
Study on static characteristics of water-lubricated textured herringbone grooved journal bearings based on laminar cavitating flow lubrication model
Authors: Liu Pengfei , Jiang Shuyun
Published: May 2021

This paper aims to investigate static characteristics of water-lubricated textured herringbone groove journal bearing under laminar cavitating flow. A theoretical model for the bearing was established based on two-phase flow and population balance equation. Field distribution and static characteristics of the bearing are analysed. The result shows the friction torque of the bearing is reduced due to the texture effect; And the frictional torque is reduced with the increasing of texture area ratio and height. The load carrying capacity of the bearing is increased, while the friction torque are slightly affected by the cavitation effect. The existence of texture increases the bubble number density in the bearing-lubrication process.
Review of Trajectory Planning for Industrial Robots
Authors: Yuxuan Hua
Published: May 2021

More and more industrial robots need high-precision trajectory control, but the traditional PID control is difficult to achieve. The simulation diagram and pose of the collision free mechanism are drawn by using rosty software. At the same time, through the experiment of MOTOMAN-HP3 robot, using VC + + application program to call the external interface function of motocom32 software, the application program planning is realized. The linear and circular trajectory planning of industrial robot in Cartesian space is studied. Linear interpolation algorithm based on spatial parabola transformation and circular interpolation algorithm based on local coordinates are proposed. The algorithm is applied to a self-designed 5-DOF spraying robot. An evolutionary algorithm based optimal trajectory planning method for PUMA560 robot is proposed. The method is based on the elite non dominated sorting genetic algorithm (NSGA-II). The results show that the minimum angular displacement, angular velocity and angular acceleration of X3 parallel robot are 56, and the maximum angular displacement, angular velocity and angular acceleration are 89.
Buckling Analyses of Edge-cracked Functionally Graded Graphene Reinforced Composite Piezoelectric Beam
Authors: Guo L J , Mao J J , Zhang W
Published: May 2021

This paper investigates the buckling behaviors of edge-cracked functionally graded graphene reinforced composite (FG-GRC) beam with piezoelectric actuators. The bending stiffness of the crack section is equivalent to the bending stiffness of massless rotational spring. The modified Halpin-Tsai model and rule of mixture are used to estimate the effective mechanical properties of the FG-GRC beam. The electro-mechanical governing equations of buckling behaviors for the edge-cracked FG-GRC beam are derived by Timoshenko beam theory, von Kármán strain displacement relationship and Ritz method. Along the thickness of the beam, both functionally graded (FG) and uniformly distributed graphene nanoplatelets (GPLs) are considered. The influences of GPL mass fraction, GPL distribution patterns, GPLs geometry, crack depth, crack location and thickness of piezoelectric layer on the buckling characters of the FG-GRC beam are studied in this paper.
Temperature rise characteristics of high-speed water-lubricated hydrostatic thrust bearing
Authors: Fukang Liu , Shuyun Jiang
Published: May 2021

Hydrostatic thrust bearings have been widely adopted in machine tools. However, high level of temperature rise due to film shearing and hydraulic power of water pump leads to decrease of machining accuracy while operating at high speeds. This paper aims to investigate the temperature rise characteristics of a high-speed water-lubricated hydrostatic thrust bearing. Based on Newtonian law of viscosity, hydrostatic theory and first law of thermodynamic, considering the influence of pressure flow, shearing effect and centrifugal effect, the temperature rise of lubricating water has been deduced. The influence of rotational speed and eccentricity has been studied. Result shows that high-speed water-lubricated thrust bearing has good thermal performance.
Microstructure and Mechanical Properties of DC Cast 7065 Aluminum Alloy
Authors: He K Z , Tan Z M , Zheng X , Zhang X M , Zhou K C
Published: May 2021

The microstructure and mechanical properties of 7065 alloy was investigate in this present work. The main intermetallic phases of the 7065 alloy identified by EDS analysis were (Mg,Cu) 2Zn, Al 2Cu and Al 7Cu 2Fe. The microstructure of the 7065 alloy after hot rolling mainly consists elongated fibrous grains containing sub-grains, indicating that dynamic recovery is the primarily mechanism during hot rolling. The 7065 alloy has lower quench-sensitive and higher mechanical properties than that of the 7050 alloy.
Influence of injection angle on oil splash of herringbone gear
Authors: Wang Yanzhong , Zhang Yaping , Huang Changxu
Published: May 2021

Oil injection lubrication is a common lubrication method for aviation gear transmission. Due to the high-speed rotation of the gear, a part of the lubricating oil splashes off the gear surface after colliding with the gear surface. The amount of oil splashing under the oil injection condition affects the cooling effect of gear lubrication. In this paper, according to the characteristics of aviation herringbone gear injection lubrication, an oil splash calculation model of aviation herringbone gear injection lubrication is established by using advanced computational fluid dynamics theory and method, and the influence of different injection angles on oil splash is analyzed, which can provide theoretical guidance for the design of injection lubrication parameters.
CMS phase-II upgrade of the RPC Link System
Authors: Boghrati B. , Amoozegar V. , Ebrahimi M. , Ghasemi R. , Mohammadi Najafabadi M. , Zareian E. , Samalan A. , Tytgat M. , Zaganidis N. , Alves G.A. , Marujo F. , Torres Da Silva De Araujo F. , Da Costa E.M. , De Jesus Damiao D. , Nogima H. , Santoro A. , Fonseca De Souza S. , Aleksandrov A. , Hadjiiska R. , Iaydjiev P. , Rodozov M. , Shopova M. , Sultanov G. , Bonchev M. , Dimitrov A. , Litov L. , Pavlov B. , Petkov P. , Petrov A. , Qian S.J. , Bernal C. , Cabrera A. , Fraga J. , Sarkar A. , Elsayed S. , Assran Y. , El Sawy M. , Mahmoud M.A. , Mohammed Y. , Combaret C. , Gouzevitch M. , Grenier G. , Laktineh I. , Mirabito L. , Shchablo K. , Bagaturia I. , Lomidze D. , Lomidze I. , Bhatnagar V. , Gupta R. , Kumari P. , Singh J. , Abbrescia M. , Aly R. , Elmetenawee W. , De Filippis N. , Gelmi A. , Iaselli G. , Leszki S. , Loddo F. , Margjeka I. , Pugliese G. , Ramos D. , Benussi L. , Bianco S. , Piccolo D. , Buontempo S. , Di Crescenzo A. , Fienga F. , De Lellis G. , Lista L. , Meola S. , Paolucci P. , Braghieri A. , Salvini P. , Montagna P. , Riccardi C. , Vitulo P. , Francois B. , Kim T.J. , Park J. , Choi S.Y. , Hong B. , Lee K.S. , Goh J. , Lee H. , Eysermans J. , Uribe Estrada C. , Pedraza I. , Castilla-Valdez H. , Sanchez-Hernandez A. , Mondragon Herrera C.A. , Perez Navarro D.A. , Ayala Sanchez G.A. , Carrillo S. , Vazquez E. , Radi A. , Ahmad A. , Asghar I. , Hoorani H. , Muhammad S. , Shah M.A. , Crotty I.
Published: May 2021

The present RPC Link System has been servicing as one of the
CMS subsystems since installation in 2008. Although the current Link
System has been functioning well for the past 13 years, the aging of
its electronic components and lack of radiation hard ASICs could
present problems for future operations. Additionally, the needs to
have a more robust control interface against electromagnetic
interference, to improve the trigger performance with finer time
granularity and to incorporate a higher bandwidth transmission lines
led the idea of upgrading the Link System for the HL-LHC. This
paper reviews the features of the recently developed prototype of
the new Link System.
The Casimir effect for nonlinear sigma models and the Mermin–Wagner–Hohenberg–Coleman theorem
Authors: Flachi Antonino , Vitagliano Vincenzo
Published: May 2021

The quantum vacuum (Casimir) energy arising from noninteracting massless quanta is known to induce a long-range force, while decays exponentially for massive fields and separations larger than the inverse mass of the quanta involved. Here, we show that the interplay between dimensionality and nonlinearities in the field theory alters this behaviour in a nontrivial way. We argue that the changes are intimately related to the Mermin–Wagner–Hohenberg–Coleman theorem, and illustrate this situation using a nonlinear sigma model as a working example. We compute the quantum vacuum energy, which consists of the usual Casimir contribution plus a semiclassical contribution, and find that the vacuum-induced force is long-ranged at large distance, while displays a complex behaviour at small separations. Finally, even for this relatively simple set-up, we show that nonlinearities are generally responsible for modulations in the force as a function of the coupling constant and the temperature.
Groundwater Resource Assessment of an alluvial aquifer in parts of Varanasi and Sant Ravidas Nagar Districts, Uttar Pradesh, India using GRE-2015
Authors: Kumar Chaurasia Abhishek , Pandey H K , Tiwari S K
Published: May 2021

The importance of groundwater in India can be realized from the fact that the 85% of rural drinking water supply is dependent on groundwater. There has been paradigm shift from surface to ground water in view of poor quality and reduction in river flow/discharge in the recent past. The concept of micro and sustainable irrigation may be achieved efficiently through groundwater. Therefore, the groundwater resource assessment is essential to make the development plan for meeting out the drinking and irrigation demand for any groundwater unit. An attempt has been made to evaluate the groundwater resource using the latest Ground Water Resource Estimation (GRE-15) of an area that has gone through extensive irrigation using groundwater so that the groundwater stress areas can be sustainably managed. The present research is based on the Groundwater Resource Estimation methodology- 2015 to evaluate the groundwater availability and the stress conditions occurring in the study area. The stage of groundwater development inferred after the study shows that Araziline block of Varanasi and Bhadohi block of Sant Ravidas Nagar district of Uttar Pradesh are falling under the critical category while Sevapuri block of Varanasi district of Uttar Pradesh falls under the semi-critical category. The current estimation warrants the immediate need for proper management of groundwater resources.
Magnetic properties of black cotton soils and lateritic soils developed on the Late Cretaceous Deccan flood basalts of northern Karnataka, India
Authors: Priya K
Published: May 2021

The magnetic properties of black cotton and lateritic soils developed on Deccan basalts in northern Karnataka, India, have been studied to determine magnetic mineral sources and decipher their relative age. These soils are highly magnetic, indicating lithogenic contribution. The results show that black cotton soils are characterized by coarse-grained stable single-domain (SSD) lithogenic magnetic minerals, and in lateritic soils, it is superparamagnetic (SP) pedogenic magnetic minerals. The main magnetic minerals in black cotton soils are titano-magnetite/maghemite, while in lateritic soils, it is magnetite/maghemite and/or hematite/goethite. The variability of these soils’ magnetic properties is due to changes in the concentration of magnetic minerals, the size of their magnetic grains, or magnetic mineralogy. Black cotton soils are younger and are at the initial stage of soil development, while laterite soils are older and are at the latter stage of soil development.
Tectonic control on drainage network evolution and evidence of neotectonic activities in of the Wan River sub-basin, Central India
Authors: Manjare B S , Singh Vineesha , Masurkar S P
Published: May 2021

The study area lies in the Northeastern part of the Gavilgrah fault vicinity, which is one of the essential tectonic elements of the Son-Narmada-Tapti lineament, trending ENE-WSE direction. In this study field, data and satellite data observation are used for drainage characteristics of Wan river sub-basins. The course of Wan River is mostly controlled by the Gavilgrah fault and associated tectonic elements. The Wan River, which crosses the North’s fault, exhibits two river terraces that rise and continue downstream, where the river flows on the down-thrown block. The drainage characteristics of the study area were investigated by using the LISS- III satellite data. The study of neotectonism is based on field evidence and drainage pattern. The nature of the drainage pattern in the study area shows dendritic, rectangular, and parallel together and shows evidence of neotectonic activity in the study area. The longitudinal river profile, the shape of the basin, gradient fluctuations, and valley incision, and their result also indicate neotectonic activities in the study area.
An experimental study on corrosion initiative of infused reinforcing bar in concrete
Authors: Shridevi Pa Velci , Ashok M , Daniel Ronald Joseph J , Dhanalakshmi A
Published: May 2021

Durability of concrete is the essential property for the lifespan of concrete structures. Rusting of steel is the major factor responsible for the loss of durability property. In order to study the corrosion behaviour of three types of reinforcing bars like Thermo-mechanically treated bar(TMT), Corrosion resistant steel (CRS), Epoxy coated rebar(ECR) were experimentally studied. The reinforcing bars having 12 mm diameter were infused in 300×300×75 mm size of concrete slab samples were kept under room temperature and certain samples are spraying with 3% of NaCl solution to attain a simulated marine exposure condition. There are various techniques including Open circuit potential (OCP), Linear polarisation resistance (LPR), Electrochemical impedance spectroscopy (EIS) are used to monitorize the corroding performance of samples. On analysing the results of the electrochemical studies, it could be inferred that the efficient rebar to withstand the corrosive nature by improving the life expectancy of the concrete structure.
Visible light flashes induced by pulsed stimulated Brillouin scattering in narrow-linewidth, high-power, near-IR fiber lasers
Authors: Choudhury Vishal , Aparanji Santosh , Prakash Roopa , Balaswamy V , Supradeepa V R
Published: May 2021

We report an interesting observation of visible light flashes indicating pulsing events in Near Infrared fiber laser systems. Using a narrow-linewidth, continuous-wave (CW) fiber laser operating at 1064 nm, we observed visible flashes composed of faint, red, orange, yellow and green colors. Concurrently with the visible flashes, the spectra in the backward direction showed different Raman Stokes orders of 1064 nm for a silica medium. We attribute this form of visible light generation to Cherenkov-type phase-matched harmonic generation in optical fibers enabled by high-peak-power parasitic pulses. These pulses are attributed to the onset of stimulated Brillouin scattering. The harmonics of different Raman Stokes orders of the pulses are responsible for the different visible colors observed. This effect is potentially observable in any laser system with a high optical power with a CW, quasi-CW or pulsed form.
Synthesis and physical characterization of magnetron sputtered Graphene-CdS bilayer
Authors: Trivedi Harshita , Shafaghi Hanieh , Shagya Naresh , Lahiri Jayeeta , Ghorannevis Zohreh , Parmar Avanish S
Published: May 2021

CdS/Graphene Nano composites have been extetinsively investigated in the field of basic industrial research and electronic device applications because of their unique physical, chemical properties and photo stability under visible‐light irradiation. In this study, we explore the electrical properties of Cadmium sulfide with the addition of graphene. CdS/Graphene hybrid was fabricated by simple RF magnetron sputtering method using CdS as a sputtering source. The hybrid material formation and structural properties of Graphene, CdS, CdS/Graphene have been discussed using XRD, FTIR, Raman, and UV–vis spectroscopy techniques. Herein, we present a facile and efficient method for hybridization of CdS Nano-sphere with graphene Nano sheet and subsequent investigation of enhancement of current of the hybrid material. Field emission scanning electron microscopy (FESEM) micrographs reveal the formation of CdS nanospheres and homogeneous scattering on the surface of graphene sheets. The UV absorption spectrum of CdS/Graphene hybrid presented a red-shifted. The enhancement in the current of CdS/Graphene hybrid has been observed due to the generation of electron-hole pairs. Also, current-voltage (I-V) characteristics of an as-grown thin film of the hybrid are conducted using 4-point probe measurement and revealed their semiconducting nature with a drastic enhancement of electrical conductivity.