bluuebunny/crossref_metadata_2025 huggingface dataset:
On the universality of the zeta functions of certain cusp forms
Authors: Laurinčikas Antanas
Published: February 2022

We consider a certain Dirichlet series associated with the zeta function of a normalized Hecke cusp form. It is absolutely convergent on the right of the critical strip. We obtain universality theorems on the approximation of a wide class of analytic functions by shifts of this series.
Bibliography: 9 titles.
Geometry of the Gromov-Hausdorff distance on the class of all metric spaces
Authors: Borzov Stanislav Igorevich , Ivanov Alexandr Olegovich , Tuzhilin Alexey Avgustinovich
Published: February 2022

The geometry of the Gromov-Hausdorff distance on the class of all metric spaces considered up to isometry is studied. The concept of a class in the sense of von Neumann-Bernays-Gödel set theory is used. As in the case of compact metric spaces, continuous curves and their lengths are defined, and the Gromov-Hausdorff distance is shown to be intrinsic on the entire class. As an application, metric segments (classes of points lying between two given points) are considered and their extendability beyond endpoints is examined.
Bibliography: 13 titles.
The $p$-convexity functor for $L_p(X)$-spaces
Authors: Volosova Nina Vladimirovna
Published: February 2022

A construction for transforming an arbitrary $L_p(X)$-norm on a normed space $E$ into a $p$-convex norm is put forward. By applying this construction to the projective tensor norm, an explicit formula for the maximal $p$-convex $L_p(X)$-norm on $E$ is obtained.
Bibliography: 9 titles.
About face: regional allied health professional early adaptation during the COVID-19 pandemic
Authors: Castle Meredith , O’Hagan Rowan , Anderberg Erin , Wangman Amanda , Harrington Helen , Dhakal Lakshmi
Published: February 2022

The coronavirus pandemic has led to significant change in allied health practice in Australia. Measures to slow virus spread have included replacing face-to-face services with telehealth services, and hands-on practice with socially distanced intervention. In the present mixed-methods, cross-sectional study, 51 allied health professionals across two public health services in regional Victoria, Australia, completed an online questionnaire with open and closed questions. The aim was to explore their experience in adapting to directed practice change during the first wave of the pandemic. The clinicians reported low levels of clinical satisfaction due to a perceived reduction in service quality and accessibility. Directed use of telehealth significantly contributed to dissatisfaction, with challenges including infrastructure, clinician and patient digital literacy and platform suitability for some patient groups and interventions. In contrast, peer support, timely and accurate communication, decision transparency, recognition and strong leadership from management supported adaptation, as did individuals’ flexibility and learning. Our findings highlight the leadership qualities and support strategies conducive to workplace adaptation during a crisis period. They also support calls for further resource development to support skill translation for telehealth platform use and initiatives to increase digital literacy and infrastructure availability in regional Australia.
Visual object categorization in infancy
Authors: Spriet Céline , Abassi Etienne , Hochmann Jean-Rémy , Papeo Liuba
Published: February 2022

Significance

Categorization is the basis of thinking and reasoning. Through the analysis of infants’ gaze, we describe the trajectory through which visual object representations in infancy incrementally match categorical object representations as mapped onto adults’ visual cortex. Using a methodological approach that allows for a comparison of findings obtained with behavioral and brain measures in infants and adults, we identify the transition from visual exploration guided by perceptual salience to an organization of objects by categories, which begins with the animate–inanimate distinction in the first months of life and continues with a spurt of biologically relevant categories (human bodies, nonhuman bodies, nonhuman faces, small natural objects) through the second year of life.
Default gender in Belgian Dutch
Authors: Vanden Wyngaerd Emma
Published: February 2022

Grammatical gender has been thoroughly investigated in codeswitching (CS) research. When (only) one of the languages involved in CS has grammatical gender, it has repeatedly been shown that (simultaneous) bilinguals assign default gender to a codeswitched noun from a genderless language (Liceras et al. 2008;Valdés Kroff et al. 2017;Parafita Couto 2019). For Spanish, “[t]here is little doubt that masculine is the unmarked or default gender” (Harris, 1991, 43). When looking at Belgian Dutch however, the picture is a bit more complicated, as it is not clear which determiner is unmarked for gender.Rooryck (2003)argues that the neuter gender is the under-specified category, while the masculine and feminine are marked for gender. This would predict that English nouns would be preceded by a neuter determiner when incorporated in a Belgian Dutch sentence. However, it seems to be the case that masculine, rather than neuter, is the preferred determiner for English codeswitches into Dutch. This paper reports on an acceptability judgment task in which simultaneous bilinguals were asked to rate (Belgian) Dutch sentences containing an English noun on a 7 point scale. Results surprisingly show a preference for feminine gender, in addition to neuter being dispreferred. I speculate that this unexpected result is due to influence from Standard Dutch.
Quasiperiodic oscillations from noncommutative inspired black holes
Authors: Rayimbaev Javlon , Bokhari Ashfaque Hussain , Ahmedov Bobomurat
Published: February 2022

We investigate the dynamics of test particles in the spacetime of noncommutative inspired black holes (NCi BHs). In this context, we first analyse spacetime properties of the NCi BHs together with innermost stable circular orbits (ISCOs) for the particles. It is observed that whereas the ISCO radius does not depend on the NC parameter, the frequencies of the Keplerian orbits and harmonic oscillations are NC parameter dependent. As an application, we consider quasiperiodic oscillations (QPOs) to test effects of the NC gravity around the BHs using twin-peak QPOs frequencies. It is found that the frequency changes even in the presence of the critical NC parameter are smaller than the error in the frequency measurements. The method developed for testing gravity using data from twin peak QPOs may also be applied to other alternate theories of gravity to obtain restrictions on the central BH parameters. We show that the orbits of QPOs lie near ISCO. This assumption may be helpful in solving the ISCO measurement problems in astrophysical observations. In addition, we determine the mass of the central BH in microquasar GRS 1915-105 and the QPO orbit in both the relativistic precession and warped disk models. It is shown that these parameters do not depend on the quantum corrections in the NC gravity. Lastly, we investigate the gravitational capture cross-section for photons and show that the effect of the NC parameter is also less than the error in shadow measurements of the supermassive BH (SMBH) Messier 87 (M87).
Analytical theory of enhanced Bose–Einstein condensation in thin films
Authors: Travaglino Riccardo , Zaccone Alessio
Published: February 2022

We present an analytically solvable theory of Bose–Einstein condensation (BEC) in thin film geometries. Analytical closed-form expressions for the critical temperature are obtained in both the low-to-moderate confinement regime (where the film thickness L is in the order of microns) as well as in the strong confinement regime where the thickness is in the order of few nanometers or lower. The possibility of high-temperature BEC is predicted in the strong confinement limit, with a square-root divergence of the critical temperature T
c ∼ L
−1/2. For cold Bose gases, this implies an enhancement up to two orders of magnitude in T
c for films on the nanometer scale. Analytical predictions are also obtained for the heat capacity and the condensate fraction. A new law for the heat capacity of the condensate, i.e. C ∼ T
2, is predicted for nano-scale films, which implies a different λ-point behavior with respect to bulk systems, while the condensate fraction is predicted to follow a

[

1
−

(

T
/

T

c

)

2

]

law.
Nonstandard interactions and sterile neutrinos in super-weak U(1) extension of the standard model
Authors: Kärkkäinen Timo J , Trócsányi Zoltán
Published: February 2022

The super-weak force is a minimal, anomaly-free U(1) extension of the standard model (SM), designed to explain the origin of (i) neutrino masses and mixing matrix elements, (ii) dark matter, (iii) cosmic inflation, (iv) stabilization of the electroweak vacuum and (v) leptogenesis. We discuss the neutrino sector of this model in detail and study the allowed parameter space of the neutrino Yukawa matrices and mixing matrix elements. The model generates nonstandard neutrino interactions, whose allowed experimental limits are used to constrain the parameter space of the model. We provide benchmark points in the relevant parameter space that fall within the sensitivity region of the SHiP and MATHUSLA experiments.
The Time and Energy Dependence of the Vela Pulsar’s Pulse Profile in γ-Ray
Authors: Yan Lin-Li , Ge Ming-Yu , Tuo You-Li , Wang Ling-jun , Zhou Qing-yong
Published: February 2022

We analyze the time and energy dependence of the Vela pulsar’s pulse profile using 13 yr observations from the Large Area Telescope on the Fermi Gamma-ray Space Telescope. It is found that the pulse profile of the Vela pulsar in γ-ray changes with time. We parameterize the pulse profile and find that different shape parameters show fluctuations rather than gradual changes with time. However, these time variation trends are insignificant due to limited statistics. The pulse profile of the Vela pulsar displays clear energy dependence in γ-ray. Different shape parameters are accurately obtained or updated, especially the phase separations among different pulses. Their energy evolution trends are quantified for the first time, which will provide restrictions on current γ-ray emission models. For the Vela pulsar, we also find a turning point at phase. Before and after this phase, the relative intensity of the pulse profile evolves with energy with the opposite trend.
The Application of Parametric Method in the Stability Analysis of Aerial Work Platform
Authors: Zhao Jian , Ma HongFeng , Zhao ZhenRen
Published: February 2022

It is difficult to change parameters and easy to make mistakes for stability analysis of aerial work platform. In order to simplify the analysis process, a professional mechanical CAD software is developed for stability analysis of aerial work platform to realize the input design parameters and output the result of calculation. It provides the reference to design the preliminary scheme of the product for the designer. It is applied to the stability analysis of aerial work platform.
Pressure Prediction Model in Transition Ladle based on Adaptive PSO-BP Neural Network
Authors: Liu Xianhe , Tian Jianyan , Li Bo , Lv Yongfeng
Published: February 2022

Generally, the pressure in the transition ladle during the manufacturing of amorphous alloys could be influenced by numerous factors. Given these issues, BP neural network is employed in this paper to ensure the prediction of the pressure in the transition ladle in the production of amorphous alloys, and adaptive PSO is adopted to adjust the weights and thresholds. The particle swarm is adaptively divided by the median value, the best location is searched locally, and the flight direction and speed of each particle are adjusted to obtain good results. Finally, emulations are performed using the amorphous alloy production site data of a steel plant. The results demonstrate that the pressure prediction model has higher prediction precision in the transition ladle established by the adaptive PSO-BP neural network. This can lay a foundation for the latter pressure control settings in the transition ladle.
A Minimal-overhead Multi-cloud Data Placement Strategy Based on Heuristic Algorithm
Authors: Xu Kun , Chen Weiwei , Zhang Yanan
Published: February 2022

Multi-cloud storage can provide better service levels than single cloud storage in terms of confidentiality, integrity, and availability at a low cost. More and more customers are storing data in multi-cloud storage systems. However, inefficient data placement is a challenge for multi-cloud storage, and current research has the problem of low algorithm efficiency. In response to this problem, a multi-cloud storage data placement optimization strategy, MPO-MO, is proposed for minimum overhead requirements. MPO-MO models availability and cost, and provides users with the lowest cost multi-cloud storage data placement strategy while meeting the specified availability constraints. A heuristic algorithm is proposed, which uses the sorting information of storage price and traffic price to select cloud storage services. According to analysis, the heuristic algorithm adopted by MPO-MO greatly reduces the optimization space compared with the traditional algorithm, and the efficiency is significantly improved. Finally, experiments prove the effectiveness of MPO-MO.
Target recognition of heterogeneous fusion images based on improved YOLO model deep learning algorithm
Authors: Wang Yufei , Qi Chengchao , Du Qinglei
Published: February 2022

Aiming at the problem of target recognition of heterogeneous fusion images, the algorithm flow and network structure of the YOLO convolutional neural network model are analyzed and explained based on the deep learning of the convolutional neural network. Combining the characteristics of the fusion image, the interface, structure and parameters of the YOLOv3 convolutional neural network are improved and adjusted while the recognition effect is guaranteed, the YOLO model is streamlined, and the training is successfully implemented and the training weights are output. The algorithm is effective and stable, and the recognition speed is faster.
UAV Object Detection Model Based on Improved Ghost Module
Authors: Yan HaoWen , Wang Yong
Published: February 2022

UAVs with computer vision functions have been widely used in various fields. However, due to the limited memory and computing power of embedded devices, the real-time scene analysis of detection algorithm running on UAV platform is still a challenge. To face the challenge, in this paper, we based on the YOLOV3 detection model by changing the convolution method and using fewer parameters to generate more feature maps. We evaluate our detector on the VisDrone2020 dataset. Compared with the original YOLOV3, we achieved impressive results, including a reduction of 76.38% of the parameter size, 77.95% of floating-point operations, and a considerable accuracy rate and faster inference speed.
Data Processing Mechanism and Algorithm Optimization for Radiated Emission Measurement of Electronic and Electrical Equipment
Authors: Zhou Yi , Zhang Ying , Murong Haoding , Liang Chengbo , Xie Jinxiong , Xu Beibei
Published: February 2022

Radiated emission is one of the most important measurement items in the field of electromagnetic compatibility. The measured value of field strength often deviates from the real value to a certain extent. According to the characteristics of typical log-periodic dipole array antenna, the relation between antenna resonance unit and frequency, as well as the position relation between phase center and calibration reference point, the calculation formula of field strength correction factor is derived. The correction factor of field strength in the 30MHz-1GHz is also calculated precisely. The data processing mechanism of radiated emission measurement is clarified. An optimization algorithm for the measurement of radiated emission is obtained eventually. After the test value is optimized by the correction factor, more accurate field strength can be obtained. The optimization interval is within (-0.348, 2.741) dB. As a data processing mechanism of the radiated disturbance, it can not only improve the accuracy of measurement, but also reduce the uncertainty and error.
Composite Insulator Defect Identification and Quantitative Method Based on Random Hough Transform Ellipse Detection
Authors: Wei Zi-xiang
Published: February 2022

To reduce the great influence on the operation of the transmission lines resulted from the external force damage of the insulator, and to improve the operation and maintenance level of the lines, a composite insulator defect identification method based on random Hough transform ellipse detection is proposed in this paper. This method takes the image of the insulator taken by drone aerial photography as the research object. First, the edge of the insulator is extracted by the Canny operator. Then, an ellipse curve fitting is applied to the extracted edge. Finally, the edge curve of the composite insulator is compared with the fitted elliptic curve, and the defect area is identified. This method cannot only identify the breakage state of the insulator, but also evaluate the degree of damage by comparing the damaged area.
A new flow velocity measurement method based on the ring electrostatic sensor
Authors: Wang Xiao-lei
Published: February 2022

Gas-solid two phase flow widely lies in industry process, while its parameters measurement (flow velocity, the mass flowrate, particle sizes, et al.) is very difficult. This paper mainly studies the solid phase flow velocity measurement questions of gas-solid two phase flow with the ring electrostatic sensor. During the flow velocity measurement study, a new mathematical model of the electrostatic sensor is established, and by simulating the obtained model the spatial filter characteristics of the electrostatic sensor are obtained. By the spatial filter characteristics analysis of the ring electrostatic sensor, a new flow velocity measurement method is obtained in this paper. At last, some experiments are accomplished in the laboratory with line sand. The new method of measuring flow velocity is effective in these experiments. The flow velocity obtained with the new measuring method is calibrated with the cross-correlation velocity. When the line sand velocity is less than 7m/s, the repeatability error of the measured velocity is less than ± 10%.
Design and Application of Storage and Inspection Integration Assembly Line for Distribution Automation Terminal based on RFID Technology
Authors: Yin Hui , Gu Lingyun , Chen Jie , Wang Haibo , Che Wei , Xin Qian
Published: February 2022

Acoording to the needs of large-scale power distribution equipment testing and quality control, a storage and inspection integrated pipeline management and control system based on radio frequency identification technology has been constructed. The overall design ideas, key functions and business processes of the system are described, and implementation methods are introduced in detail. After pilot application, the system completed the real-time update of the whole process quality inspection data information, such as the test progress, detection data, and storage status, which improved the detection efficiency and management cost, greatly reduced the manpower input, and realized integrated management and pipeline inspection of internal resource.
Design of transformer load management system based on multi-resources data
Authors: Fan Qiang , Chen Yuanyuan , Li Bowen , Guo Lisa , Chen Yafei , Xiao Shuzhou , Zhao Chao
Published: February 2022

Ensuring data quality, the main transformer load risk assessment model based on load rate characteristics is established. Further, using deep learning algorithm, the main transformer heavy and overload risk prediction model is constructed to realize the risk grade assessment and risk prediction on load feature defects. Finally, through the construction of the system platform, the basic functions such as multi-dimensional index calculation, statistics and visual display of real-time load characteristics of the main transformer are realized.
High speed data transmission method of substation intelligent auxiliary monitoring system
Authors: Zhang Li , Huang Xiongjian , Han Haojiang
Published: February 2022

In order to better ensure the effective operation of substation intelligent auxiliary monitoring system, aiming at the problems of slow data transmission speed and poor data processing security of current monitoring system, a high-speed data transmission method of the substation intelligent auxiliary monitoring system is proposed. By constructing the data processing platform of substation intelligent auxiliary monitoring system, the data transmission algorithm of auxiliary monitoring system is optimized, reasonably select the optimal path of data transmission and conduct security encryption processing, so as to improve the high-speed data transmission efficiency of substation intelligent auxiliary monitoring system. Finally, the experiment shows that the high-speed data transmission method of the substation intelligent auxiliary monitoring system has higher practicability in the process of practical application and fully meets the research requirements.
The Design of High-performance and Configurable Load Storage Unit
Authors: Ma Wentao , Huang Libo , Guo Hui , Cheng Yuanhu , Yang Ling , Tong Gan , Yan Run , Lan Mengqiao
Published: February 2022

A high-performance configurable load storage unit (LSU) design is completed under the open source RISC-V framework. By compressing the pipeline depth, the module function structure is optimized under the premise of the control unit overhead, and the instruction processing speed is improved. In the method of instruction processing, a partial out-of-order processing strategy is adopted to control the increase of module complexity, reduce instruction blocking, and increase the density of instructions flowing into the LSU and the write back speed; redirection technology is adopted, and 3 channels are added when writing back data, which improve the speed of data write back, reduce instruction blocking, and ensure the correctness of the data; in order to support the partial out-of-order processing of the load and store instructions and the data redirection function, a double buffer design is adopted, the issue port and write-back port have been expanded to improve the transmission speed and write-back speed of the command. At the same time, the unit adopts a configurable way to expand the function, and separates the additional functions separately. It has good configurability and provides a good design for the next step of function expansion. Experimental results show that, after optimized design, LSU has increased the speed of existing processors by 63.5%, and has huge potential performance in processing high-density and read-related instructions, while the unit overhead has been reduced, the overall performance has been significantly improved.
Non-singular Fast Terminal Sliding Mode Control of Wind Turbine Based on Combined Feedback of Power and Load
Authors: Hong Xuanyu , Li Jianguo , Liu Shichang , Chen Dianhui
Published: February 2022

A nonsingular fast terminal sliding mode control of wind turbine based on combined power and load feedback is proposed to deal with the problem of power instability and load imbalance of wind turbine when the wind turbine operates above the rated wind speed. The control strategy uses three independent nonsingular fast terminal sliding mode controllers to reduce the Tilt moment, Yaw moment and stable power on the hub fixed coordinate system respectively. Finally, the 2MW wind turbine is simulated by MATLAB and Bladed software, and the control strategies of three PI controllers are compared. The results show that the control strategy not only has a good effect on stabilizing the output power, but also has a prominent performance in reducing the unbalanced load of the wind turbine.
Heat transfer enhancement in double-pipe heat exchanger: A review
Authors: Kumar Singh Shailendra , Kumar Chauhan Manish , Kumar Shukla Anoop
Published: February 2022

Due to the wide need for heat transfer improvement in heat exchangers, it always stands a challenging field to grow effective and efficient heat transfer equipment with qualities of cost-effectiveness, reduced size, and maximum usage in a wide variety of applications under several operating conditions. The heat exchangers are mostly used to fulfil the requirements of high heat dissipation in industries. In this review article, a focused analysis is done on heat transfer improvement in double-pipe heat exchangers using different geometries in the flow, and heat transfer characteristics are also taken into consideration for the analysis. Many researchers have already analyzed a double-pipe heat exchanger as an experimental unit and with the help of simulation. Several past studies are examined and concluded to build an effective system using a heat exchanger. The significance of Prandtl number, Reynolds number, Nusselt number, and pressure drop coefficient quantities are shown in the studies. A close concern on nanoparticles in inside pipe is also studied for heat transfer improvisation using a double-pipe heat exchanger. New outcomes are perfectly verified and assist in the investigation of various other studies.
Performance Investigation of Sinusoidal Corrugated Absorber Plate Solar Air Heater
Authors: Kumar K , Debbarma A
Published: February 2022

This paper presents the CFD analysis of performance investigation of sinusoidal corrugated absorber plate solar air heater (SAH). The thermal performance is investigated with various inlet mass flow rates and solar heat flux. Simulation process of this model is carried out using CFD base analysis using Ansys (fluent) software. Air heater involving sinusoidal absorber plate, baffles and fin are modelled by ANSYS Workbench. Base model CFD results are validated against published ones and found to have a good agreement. In this paper we compare thermal efficiency and temperature at the exit of sinusoidal absorber plate solar air heater with fin, baffles and without fin and baffles. Baffles help in creating recirculation, separation and turbulence zones in the flow passage and fin helps in increasing the net heat transferring area between sinusoidal plate and flowing air. Thus, for the same size as the air heater, thermal efficiency increases. Thermal efficiency increases with rise in mass flow rate and outlet temperature decrease with the increase in mass flow rate. Computations are based on FVM, shear stress transport (SST) k-ω turbulence model, and SIMPLE algorithm has been implemented. CFD tool is used to find out the temperature distribution inside the solar air heater.
Solar-Powered Reverse Osmosis Desalination
Authors: Shukla Akhil , Agarwal Shubham , Narwat Kuldeep
Published: February 2022

With the dimension of renewable energy and resources from the earth, solar power has come as a bundle of a package for energy production by using PV solar cells for residential applications. Extension of freshwater from the earth produces water near a city in different parts of the worldwide is the serious problem especially in North African countries and the Middle East. So, for the survival of humanity, desalination is a necessity for the living and with the use of natural energy i.e., plenty of sunshine coming from the sun. With recent advancements in technology in the field of solar power & improving the design of energy conversion systems operating on solar energy harvesting & converting it into electricity with the help of thermopiles. The major focus is on designing & designing parameters with the overall performance enhancement of the proposed energy conversion system. Nowadays, solar energy can also be employed independently or with fossil fuels to reduce CO2 emission & the Levelized cost of power generation. But with the advancement of the supercritical Brayton cycle also informs the prospects of lower Levelized cost for higher efficiency at accessible temperature.
Thermal Management of Various Battery array arrangement at various Environmental conditions for hybrid and electrical vehicles
Authors: Aditya Mutha , Singh Sikarwar Basant , Singh Gautam Sachin
Published: February 2022

The current paper simulates the thermal management of Li- ion battery modules of 6x5, 3x10 and hexagonal array arrangements. High-fidelity 3-D CFD simulation is carried out using commercial CFD software ANSYS ICEPAK®. An experimental study of battery array arrangement of Li-ion was carried out for validating the simulation results. Forced air convection mode was used for transporting energy from the battery module to the environment. Post-validation, the thermal analysis of the various array arrangement of battery system was investigated at various environmental conditions. It was realized that the hexagonal array arrangement was more effective than the 6×5 and 3x10 cell arrangements for controlling the temperature within the cells and battery module. The convective heat transfer coefficient is optimized to maintain the optimal temperature ranges of Li-ion cells for different inlet velocities and ambient temperatures. Finally, Inlet velocities and duct sizes for different ambient temperatures were suggested for the effective and efficient functioning of Li-ion battery array arrangement for electric vehicles.
Effect of a Flat Plate on Drag Force Reduction and Heat Transfer Characteristics Around Three Heated Square Obstacles
Authors: Admi Y. , Lahmer E. B. , Moussaoui M. A. , Mezrhab A.
Published: February 2022

In this research, a numerical investigation is performed to simulate the fluid flow and the isotherms lines around three square cylinders placed side-by-side vertically and equally spaced in a bidimensionnel horizontal channel controlled by a flat plate at a fixed Reynolds number (Re = 100). The numerical approach used is the double multiple relaxation time of the lattice Boltzmann method (DMRT-LBM). The objective of the inclusion of the plate is to control the vortex shedding and improve the characteristics of the heat transfer around the squares cylinders. The numerical code is validated with the numerical and experimental results existing in the literature for flow past around a square cylinder with and without a control device. The impact of the length of a flat plate on the streamlines, the isotherms lines and the drag force are presented. The results obtained show the inclusion of the plate decreases the drag force and increases the thermal exchange.
Thermodynamics analysis and performance enhancement of battery thermal management system with suitable variations in operating parameters
Authors: Aryal Roshan , Anand Akshat , Kumar Saxena Nitin , Sharma Rohit , Kumar Niraj
Published: February 2022

Electric Vehicles (EVs) will be a major mode of road transportation in short period of time. Batteries are the major source of energy storage for propulsion of EVs in which Li-ion batteries are currently the most suitable option. A suitable temperature range of 15-400C must be maintained for optimal performance and safety of Li-ion batteries, which can be achieve through battery thermal management system. In this study, a PCM based thermal management system has been drafted by considering the heat dissipation rate for 1C, 2C and 3C discharge rate of Li-ion batteries and simulated in ANSYS FLUENT 19.2 software. Suitable alternatives are suggested for the efficient performance of battery thermal management and the effects are also discussed. The result shows that PCM based system was able to hold the battery temperature below 400C with 1C, 2C and 3C discharge rate for time interval of more than 3600 seconds. PCM based system with thickness 10mm shows better result when compared with 6mm and 8mm while the couple PCM based system performs better than PCM with capsule system.
Energy Management of Solar Thermal Battery: Issues and Challenges
Authors: Kumar Yadav Deepak , Kumar Singh Rajeev , Singh Sikarwar Basant
Published: February 2022

Fossil fuels are the major source of energy in developing countries but problems like generation of greenhouse gases and financial burden on the economy due to import are the problems associated with it among others. The use of renewable energy sources like solar energy is increasing now a days but problems like fluctuation of energy in day and time dependent availability hindered its implementation at large scale. This problem can be overcome by the application of solar thermal battery that store the solar energy in various forms. In this paper, state-of the-art of energy storge and their issues and challenges of in form of sensible, latent and thermo-chemical system were presented. Later, experimental study of tailoring paraffin wax for storing the solar energy in form latent heat were presented. It is concluded that pure paraffin wax is not appropriate energy storage material in form latent heat because of low thermal conductivity. State of the art of enhancing the thermal conductivity of various phase change materials were also reported.
Analysis on Hydraulic Calculation of Pipelines in Automatic Sprinkler Systems
Authors: Liu Xun , Shi Jing xian , Meng Jing
Published: February 2022

This paper discusses the hydraulic calculation of automatic sprinkler systems in the following aspects: hydraulic calculations respectively in accordance with the GB50084-2001(2005 edition) and the GB50084-2017 and their comparison. Through the comparison, it’s found there is little difference between the results of hydraulic calculations with the flow rate of sprinklers calculated based on their actual pressure or with the flow rate of each sprinkler as a fixed value. To simplify the calculation, it is recommended to use a fixed value for calculation.
The theoretical analysis and simulation of double cladding Er/Yb Co doped optical fiber laser
Authors: Gu Yuanyuan , Yin Meilin , Lu Hui , Cui Yan
Published: February 2022

Rare earth ion fiber laser has the characteristics of compact structure and excellent beam quality. Cladding pumped fiber laser has become the best choice to obtain high-power laser. This paper introduces the characteristics of Er/Yb Co doped fiber laser, The theoretical model of Er/Yb Co doped fiber laser is established from the atomic energy level and energy transfer in erbium ytterbium Co doped fiber. By changing the initial pumping conditions and the reflectivity of the rear grating, the output power of the laser with different pumping power and different output mirror reflectivity can be calculated and numerically simulated. In this paper, the theoretical model of Er/Yb Co doped fiber laser is established, the numerical simulation is carried out, and the gain characteristics of the laser are analyzed.
Collaborative operation of 6-DOF industrial robot based on digital twin
Authors: Fan Jingsong , Zhong Xiangqiang , Di Zhimin , Fang Huajie
Published: February 2022

In order to realize the collaborative operation between the physical prototype and the virtual prototype of industrial robot, a digital twin model of a six-degree-of-freedom industrial robot was established. The structure and motion parameters of the 6-DOF industrial robot are introduced. The virtual prototype model of the industrial robot was established based on Visual One; the digital twin modeling of the industrial robot was completed by the three methods communication between the virtual prototype of the industrial robot and the physical prototype was realized, and the virtual and real collaborative operation of the twin robot and the physical robot was realized. Experiments show that when manipulating the movement of the robot on the physical terminal, the digital twin was consistent with its behavior. The research results provide references for the application of digital twin technology in the field of industrial robots.
Application of anticoagulant ice microcapsule material in micro-surfacing technology
Authors: Wang Zihao , Guo Liujie
Published: February 2022

In order to solve the problem of road icing on vehicle driving safety in winter, a non-chlorine environmental protection anticoagulant ice microcapsule material is proposed in this study. It is a multi-core microcapsule structure composed of capsule core and capsule wall. The particle size is less than 0.075mm. It has good chemical stability, good mechanical properties and slow-release effect. When applied to the road, it will not affect the quality of road engineering. Based on the design concept of traditional salt storage pavement, the non-chlorine environmental protection anticoagulant ice microcapsule material is combined with micro surface treatment technology, and the micro surface compound application technology suitable for the special service environment of pavement in freezing area is designed and studied. The main results are as follows: (1) the ice coagulation effect of anticoagulant ice microcapsule materials is tested by sponge ice melting test and ice layer adhesion test. The test results show that anticoagulant ice microcapsule materials have significant ice anticoagulant effect, and are better than salt storage anticoagulant ice materials. (2) Through the road performance analysis of the micro surface, the anticoagulant ice microcapsule material has a certain impact on the cohesion and wet wheel wear of the slurry mixture, but they all meet the specification requirements. (3) The material is used in surface preventive maintenance technologies such as micro surfacing. It has excellent low-temperature snow melting ability, sustainable slow-release effect, excellent road performance and environmental protection.
A study on the degassing mechanism of Pb-based alloy under ultrasonic treatment
Authors: Li Wendi , Feng Jicai , Bai Yang , Liang Yuxin , Yang Yao , Li Bangsheng
Published: February 2022

In recent years, the ultrasonic technique is being developed at a pretty faster speed, whose assisting tactic has been applied in the electronic packaging field. What we need is to determine the mechanisms of ultrasonic treatments on electronic packaging fillers. In this paper, Pb-based alloy is typically chosen as the filler metal, in this paper, it is found that the flowability of which can be improved under ultrasonic vibration. Also, ultrasonic degassing efficiency is greatly promoted, with the best parameter for degassing that ultrasonic power and duration time of 1000W and 60s, a molten alloy’s treating temperature of 340°C. The assistance of ultrasonic is deeply explained from the thermodynamic aspect. Understanding of the atomic level interactions of liquid Pb atoms and vacuum is crucial, so we make an ultrasonic-assisted molecular dynamic simulation of melting Pb to room temperature to 330°C in 10ps, and the diffusion behavior of Pb atom under periodic vibration is revealed.
PLC-based Lifting Device for Shore Power Cable
Authors: Zhang Ruohao , Li Ao , Zheng Hang
Published: February 2022

Due to the different sizes and heights of ships docked at the port and the rise and fall of water at the harbor, there are many problems in providing electricity to ships berthing at the port [1]. The shore power cable lifting device is adaptable to the cable connection under different environments, mainly consisting of a multi-stage telescopic hydraulic arm [2], a cable drum, a luffing mechanism, and a slewing mechanism. In the process of cable lifting, the cooperative control of multiple working mechanisms is related to the cable connection precision, as well as the safety. Compared with the traditional control of the circuit, PLC control can ensure higher accuracy and safety, and improve the automation level and convenience of shore power connection.
PCEs containing C5 and C6 based PEO side chains: A comparison on the synthesized polymers and the resulting dispersing effectivenesss
Authors: Ng Serina , Feng Ke , Liu Zhaoyang
Published: February 2022

The reactivity of C5 and C6 based PEO macromonomers in the synthesis of PCE superplasticizers, followed by the dispersing abilities of such PCEs on cement pastes were analysed and compared in this study. It was found that free radical compolymerisation of C5 macromonomers and acrylic acid (AA) produced PCEs with less controlled block compolymers characteristics, which were highly sensitive to reaction conditions such as the rate of polymer additions, etc. This can be attributed to the difference in reactivity constants of the monomers, where AA was highly reactive. The orderness became more dominant when the temperature of synthesis was suitably controlled. The ease in adapting the molecular architecture of C6 based PCEs as compared to C5 based PCEs enabled better prediction of cement dispersing ability, as confirmed by the slump flow tests performed. It was thus shown through this study that using C6 macromonmers, PCE with tailormade acrhitecture could be developed easier than with C5 macromonomers, potentially to adapt to different types of cement on the market.
Experimental study of machined surface quality in ultrasonic vibration-assisted turning of 5A06 Al-Mg alloy
Authors: Xu Yingshuai , Zheng Huaqiang , Fan Fanglei , Zhang Jie , Wu Yihan
Published: February 2022

The 5A06 Al-Mg alloy is a soft material, and the phenomenon of knife sticking is extremely serious during cutting, likewise, it is easy to generate build-up edges. Therefore, it is difficult to acquire good surface quality in turning. For this purpose, the ultrasonic theory and cutting theory are fully combined in this study, and the machining mechanism of conventional turning (CT) is changed by applying ultrasonic vibration (UV) to the cutting tool, so as to build up the machining results. The turning experiments of 5A06 Al-Mg alloy with or without UV are carried out under different process parameters, and through which the effects of ultrasonic amplitude (UA), feed rate (FR), cutting depth (CD) and cutting speed (CS) on the surface roughness of machined workpiece are investigated and analyzed. The consequences show that the process parameters have a different degree of effect on surface roughness. And there are special process parameters suitable for UV assisted turning (UAT), under which the processing results of UAT is obviously better than that of CT. In addition, it is found that by contrast experiment of surface topography under ideal process parameters built-up edges, surface scratches and other phenomena are not easy to arise in UAT to obtain the better surface topography than CT.
Phospholipid and menthol based nanovesicle impregnated transdermal patch for nutraceutical delivery to diminish folate and iron deficiency
Authors: Kumari Durga , Bhatia Eshant , Awasthi Lisha , Banerjee Rinti
Published: February 2022

Adequate micronutrient availability is particularly important in women, children and infants. Micronutrient deficiencies are the major cause of maternal and neonatal morbidity. To overcome this, WHO recommends the use of folic acid and iron supplements for reducing anaemia and improving the health of the mother and infants. Oral intake of supplements for nutritional deficiencies are associated with gastric irritation, nausea, constipation and non-patient compliance due to associated taste. In case of absorption deficiency nutrients administered orally pass-through digestive tract unabsorbed. In the present study, we propose transdermal delivery of nutraceuticals to avoid the limitations associated with oral intake. Transdermal delivery has limited use because of the closely packed barrier of the stratum corneum that limits the permeability of molecules across skin. Here, we have used biomimetic nanovesicles impregnated in transdermal patches for delivery of folic acid and iron. Nanovesicles are prepared using an abundant component of cell membrane, phosphatidyl choline and a permeation enhancer. Further these nanovesicles are impregnated onto polyacrylate based transdermal patch. In vitro studies have shown the ability of nanovesicles to fluidise skin lipids and penetrate into deeper skin. In vivo application of transdermal patches gradually increased the systemic concentration of nutraceuticals. Post application of the patch, five-fold increase in plasma folic acid concentration and 1.5-fold increase in plasma iron concertation was achieved in 6 h. Developed nanovesicles were compatible with keratinocytes and fibroblasts as tested in vitro and have the potential to enhance the cellular uptake of molecules. Skin irritation studies on human volunteers have confirmed the safety of nutraceutical loaded nanovesicles. Thus, the developed nutraceutical loaded transdermal patches provide a potential, easy to use platform for micronutrient delivery in infants and mothers.
Ribbon operators in the generalized Kitaev quantum double model based on Hopf algebras
Authors: Yan Bowen , Chen Penghua , Cui Shawn X
Published: February 2022

Kitaev’s quantum double model is a family of exactly solvable lattice models that realize two dimensional topological phases of matter. The model was originally based on finite groups, and was later generalized to semi-simple Hopf algebras. We rigorously define and study ribbon operators in the generalized quantum double model. These ribbon operators are important tools to understand quasi-particle excitations. It turns out that there are some subtleties in defining the operators in contrast to what one would naively think of. In particular, one has to distinguish two classes of ribbons which we call locally clockwise and locally counterclockwise ribbons. Moreover, we point out that the issue already exists in the original model based on finite non-abelian groups, but it seems to not have been noticed in the literature. We show how certain common properties would fail even in the original model if we were not to distinguish these two classes of ribbons. Perhaps not surprisingly, under the new definitions ribbon operators satisfy all properties that are expected. For instance, they create quasi-particle excitations only at the end of the ribbon, and the types of the quasi-particles correspond to irreducible representations of the Drinfeld double of the input Hopf algebra. However, the proofs of these properties are much more complicated than those in the case of finite groups. This is partly due to the complications in dealing with general Hopf algebras rather than group algebras.
Viability of biofertilizer bacteria Rhizobium spp based on household waste
Authors: Erdiansyah I , Taufika R , Widodo TW , Damanhuri  , Jannah dan DM , Prayitno H
Published: February 2022

The research was carried out from May 2021 to August 2021. The research was carried out at the Jember State Polytechnic Plant Protection Laboratory. This study used four types of household waste media, namely rice washing water, rice bran water, soybean dregs water, and Yeast Mannitol Agar media as controls. Each treatment was repeated 5 times to obtain 20 experimental units. The data obtained were then analyzed qualitatively and quantitatively. Quantitative data analysis by calculating the number of colonies with TPC (total plate count) and T-test techniques, qualitative data obtained by observing bacterial purity and gram staining. The results of this study indicate that alternative media for bran water waste conventionally produced the highest bacterial population with a colony number of 6,80 x 1024 CFU and the lowest bacterial population came from rice alternative media with a colony number of 1.28 x 1024 CFU. Bacterial viability observed for 4 months between aseptic media and conventional media showed the results of the t-test with a count of 1.49 x 10-1 CFU. shows the results (ns) are not significantly different.