bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polymer composite materials based on ultra-high molecular weight polyethylene
Authors: Okhlopkova A A , Danilova S N , Dyakonov A A , Vasilev A P , Ivanov A N , Sleptsova S A 
Published: February 2021

Abstract
Ultra-high molecular weight polyethylene (UHMWPE) has a number of unique properties: low friction coefficient, high strength and toughness, frost resistance, and resistance to aggressive media. This determines the use of UHMWPE as a polymer matrix for the manufacture of high-strength technical products. The use of nanoparticles as polymer fillers, which has emerged over the last two decades, has made it possible to significantly improve the characteristics of nanocomposites while reducing their degree of filling, achieving an improvement in properties that could not be achieved using traditional fillers and modifiers. Due to the high specific surface area, nanofillers have high activity for structuring the polymer matrix. However, this becomes a problem in the development of polymeric materials with nanofillers, due to the processes of agglomeration, as well as the difficulty to distribute them uniformly in the volume of the polymer matrix. We have demonstrated an efficient mixing process for UHMWPE and nanofillers, consisting of mechanical activation in a planetary mill and the technology of liquid-phase compounding under the continuous action of ultrasonic vibrations. Despite the large number of studies aimed at enhancing the interfacial interaction between UHMWPE and inorganic fillers, the problem of the weak interaction between the polymer matrix and the inorganic filler remains unsolved. Thus, the research work is aimed at obtaining new composite materials based on UHMWPE strengthened with organically modified montmorillonite and compounds containing 2-mercaptobenzothiazole, ZnO and sulfur.
Aerodynamic space tether system as a system with distributed parameters
Authors: Elenev D V , Zabolotnov Yu M , McMillan A J 
Published: February 2021

Abstract
The motion of the aerodynamic tether system includes two stages - the deployment and the motion of the deployed system. The initial condition for the deployment model is that of a spacecraft with a rigidly connected second body in a circular orbit about the planet. The deployment process is based on the aerodynamic forces acting on bodies. After the separation of the rigid connection, further motions of the bodies are then controlled by the tether release mechanism which unreels the tether and controls the rate at which the tether is unreeled. The motion of the system is described by the multi-point model, splitting the tether into a number of parts and using the series of separations of material points from the spacecraft, thus forming a mathematical model of the system with distributed parameters. The aerodynamic forces acting on the tether are taken into consideration. This model makes it possible to calculate numerically elastic deformations and curvature of the tether and provides more accurate modelling if compared with the two-point model.
Modelling the work of the transport complex
Authors: Kuzmin V S , Elenev D V 
Published: February 2021

Abstract
The modelling of the transport complex is made using an automated system and an example of the enterprise that uses the dangerous materials. The example of such enterprise is a nuclear power station. The automated system used for modelling is a web-based intranet application that realizes monitoring and control functions. The automated system uses a system of objects included into the model of the enterprise, namely: gates, roads, transportation devices and controllers, airtight zone, describing the reactor building, gateway which allows to move cargo into and out from the building, non-airtight zone, which describes the outside area, and the zone of loading and unloading the cargo. The system receives input signals of discrete or analogue origin. Basing on the results of data collection, the algorithms of forecasting the crucial changes in states of main elements of the transport complex were developed. The automated system models the workflow of elements and the whole transport complex.
Opportunities and prejudices in synthetic experiments
Authors: McMillan A J 
Published: February 2021

Abstract
Synthetic experiments, meaning experiments performed using models of reality, are used in a variety of contexts. In recent years, advances in computing capability have led to the development of modelling capability that replicates reality to such an extent that in some circumstances it is difficult to distinguish the model from reality. From a science or engineering perspective, computational analysis models are used to replicate or predict phenomena such as fluid flow or stress in a machine component, but the capability has also crossed over into the arts enabling the computer generated imagery (CGI) used in films, and the augmented reality (AR) of video games. This paper reviews the application of synthetic experiments to replace physical experiments and discusses some of the advantages and pitfalls of such an approach in the context of education. The trend for democratizing analysis is considered, and the dangers of misinterpreting results are discussed. A discussion of the issue of model over–simplification is given, and finally the use of synthetic experiments as part of a systematic scientific investigation is also considered.
Numerical analysis of an electrostatically formed membrane mirror
Authors: Volchek O S 
Published: February 2021

Abstract
The paper presents a numerical algorithm developed to determine the deformed shape of a membrane mirror controlled by electrostatic forces. Deformable mirrors are key components that are used in combination with wavefront sensors and real-time control systems in adaptive optics. The electrostatic membrane mirror concept implies using a thin conductive reflective membrane stretched over a solid flat frame and deformed electrostatically by applying control voltages to electrostatic actuators positioned behind the membrane. The proposed algorithm implies solving a coupled structural-electrostatic problem by using finite element and boundary element methods. Small deflections of a membrane are described by Poisson’s equation. The electric charge distribution over the membrane surface having a prescribed potential is governed by a Fredholm integral equation of the first kind. The coupled problem is solved iteratively, and a criterion for terminating iterations when searching for a steady-state solution is presented. The distinctive feature of this approach is that it allows us to take into account electrical edge effects typical for conducting thin-walled structures of very small thickness. Illustrative examples are provided to show the applicability and validity of the proposed method as well as its advantage over some existing techniques.
The study of the applicability of polymer composite materials for the manufacture of the impeller of a centrifugal compressor
Authors: Martynyuk L A , Afanasiev D V , Bykov L V , Ezhov A D , Mezintsev M A 
Published: February 2021

Abstract
The use of composite materials in modern designs is one of the promising areas. Despite a number of advantages, the use of composite materials imposes a number of restrictions on their use. One of them is a binder’s degradation temperature. The revision of the existing methodology for determining the thermal state of the compressor wheel through the use of modern calculation tools and their experimental justification will allow further reliable thermal calculation taking into account the anisotropy of material properties. For carrying out computational research and testing manufacturing technology, a three-dimensional model of the impeller of a centrifugal compressor and the motor shaft was developed.
Investigation and correlation of radioactive hazards with magnetic parameters and heavy metals of dwelling sand from two major rivers in south India – A comparative study
Authors: Murugesan S , Ravichandran S 
Published: February 2021

Abstract
Cauvery and Palar, two major rivers in Tamilnadu, India, have importance for irrigation, drinking, electricity and river sand is used as a major material of building construction in India. The natural radionuclides such as uranium, thorium and potassium (238U, 232Th, 40K) isotopes are investigated through gamma ray spectrometer with NaI(Tl) detector. The average values of radionuclides and in-situ dose are measured. Related parameters like absorbed dose (ADin & ADout), Annual Effective Doe Equivalent (Ein & Eout), and also hazard indices to assess radiation exposure to human such as average radium equivalent (Raeq), external (Hex)and internal (Hin) hazard indices, Radioactive heat production (RHP), internal and external Excess Lifetime Cancer Risk (ELCRin and ELCRout), Alpha (Iα), Gamma Index (Ig) and Annual Gonadal dose (AGDE) are computed and correlated. This study exhibits that almost all the radioactive parameters are in control by comparing to the world average. Nevertheless, the Cauvery River except site no.20 does not produce a radiological hazard. But, the palar river does slightly produce a radiological risk especially site no.6 shows three times of the world average.
Impact of SRFE process on electrical properties of P-N photodetector
Authors: Sangwaranatee N , Srithanachai I , Niemcharoen S 
Published: February 2021

AbstractSemiconductor properties change from soft radiation flash exposure process (SRFE) will present in this paper. Semiconductor device use with radiation application and always degrade because impact from radiation will damage on device structure. Currently, the defects from radiation cannot explain all of impact to electrical properties because has wind range in several application. However, this paper will present influent from Roentgen radiation on P-N photodetector device by expose for few second and low energy. The radiation will expose on device for many time to reach target time and will control distance between radiations machine and devices. Forward current of device after SRFE process has changed in positive way by build in potential (Vbi) decrease around 0.2V and forward current increase around 4 orders.
Synthesis and characterisation of copper oxide thin films by double dip method
Authors: Salam Shifa , Jose Ben , Raphael Rakhy , Anila E I 
Published: February 2021

Abstract
Cupric Oxide thin films were prepared and deposited on glass plate by double-dip method. The study was conducted on samples annealed at different temperatures. The deposited films showed poly crystalline nature with a preferred orientation of monoclinic structure along (111) plane. The thicknesses, as well as the refractive indices of all the films, were determined by using Near Normal Spectroscopic Reflectometry. Optical studies revealed a decrease in band gap with annealing temperature. The V-I graphs were found to be linear for a short-range when measured by two probe method. The thin films showed a resistivity of the order of kΩ-cm. An increase in electrical conductivity with temperature reveals the semiconducting nature of the thin films.
Effect of reflector materials to the neutron flux and k effective in the accelerator driven subcritical reactor
Authors: Tien Tran Minh , Phung Nguyen Hong Thien , Hien Bui Thi Thanh 
Published: February 2021

Abstract
The paper presents the results of the calculation of neutron flux distribution and k effective factor in the ADSR with different reflector materials. Materials include graphite, Be, Y2O3, ZrO2. For each type of materials, the neutron flux distribution according to the height of the reactor, the radius, the neutron energy emitted, and k effective has been calculated. The results show that the maximum neutron flux and k effective factor is berium material as combined with Th-233U mixed fuel.
Exponential piece wise regression for rainfall data
Authors: Anil Kumar K , Sendil V N , Venkatramana Reddy S , Sarojamma B 
Published: February 2021

Abstract
There are several regression models for the rainfall in the literature. Some of them are linear regression model, multiple regression model, piece wise regression model, Poisson regression model, negative binomial regression model, etc. Various piece wise regression models are linear piece wise regression, polynomial piece wise regression, cubic piece wise regression, quadratic piece wise regression, etc. This paper proposes three piece wise regression models using exponential smoothing models, i.e, simple exponential smoothing spline, holt’s exponential spline, and damped exponential spline for annual rainfall data from 1970 to 2017 with two knots at 1990 and 2005 with three subdivisions. Symmetric mean average percentage error is used as an accuracy measure for choosing the best model among the proposed three exponential spline models.
Retrial queueing model with two heterogeneous server using matrix geometric method
Authors: Seenivasan M , Rajarajan G , Indumathi M 
Published: February 2021

Abstract
We consider a retrial queuing system with heterogeneous servers. The two servers have service rate µ1 for server 1 and µ2 for server 2 where µ1≠µ2. Server 1 is always obtainable and server 2 is intermittently obtainable. Server 2 goes to execute some important dissimilar jobs when the queue distance is increasing. By introducing the Markov Process {R(t), I(t); t ≥ 0} the stationary analysis has been carried out using Matrix Geometric Technique(MGT). Some numerical outcomes are also obtained.
Slope stability analyses at Agumbe Ghat section NH-169A with and without slope protection
Authors: Keshava Vishikha , Patil Nayana N , Venkatesh B R 
Published: February 2021

Abstract
Slopes along the highways in hilly areas are more prone to landslides and rockfalls. Slope failure predominantly occurs during monsoon and traffic gets interrupted. Slope stabilityanalysis is carried out to lessen the adverse effects of landslides and slope failures. One of the dangerous Ghat section in Karnataka is Agumbe Ghat. It has totally 14 hair pin bends. The work is focussed on slope stability carried out between 7th and 8th bend of Agumbe Ghat section which passes through NH-169A. The work reveals the analysis of slope stability with and without anchors. Slope catastrophes can be determined through suitable measurement of slope stability. Soil samples at the terrain are collected and tested in laboratory for important soil parameters. The bore log data has been collected and relevant data has been used for the analysis. The software used for analysis is GEO5 which helps to verify slope stability for critical circular or polygonal slip surfaces. Profile co-ordinate points have been surveyed and slope details have been collected from Google Earth,andwere used to plot 7th bend profile. This paper gives insight regarding,the set of anchors and effects on shear stresses along failure plain and stabilizing the slope effectively. Stability analysis were carried out by finding Factor of safety before and after adding anchors. It is found that the anchors increased the stability of slopes from 1.35 to 1.56.
Bio-Mineralization process on concrete substituted with different types of waste materials
Authors: Rohini I , Padmapriya R 
Published: February 2021

Abstract
Million tons of waste materials were produced in the world each year and most of it is not recyclable. To protect the environment from pollution and depletion, it is imperative to find explication for the safe disposal of waste materials. Using waste material in concrete production is a propitious method for eliminating the waste and reducing the cost of concrete. Also, the green concrete technology is expanding, it is necessary to utilize wastes in concrete that is generated from all the sectors. In construction large amounts of concrete from buildings was generated and demolitions made up 30-40 % of total wastes. Around 33 tons of Copper slag is produced across the world and 6 to 6.5 tons in India. Electronic waste is emerging as a serious public health and environmental issue in India and approximately 2 million tons of e-waste is generated annually. Concrete produced from wastes will have declination over the strength and it is necessary to improve the properties by some other technique. Self-healing concrete is a brand-new technology that ‘heals’ its own cracks and indicates a promising future in reducing the inevitable deterioration of concrete structures and the high maintenance costs involved. This research includes the inclusion of waste materials into the concrete and determination of compressive Strength of waste substituted concrete. Three major Wastes such as Demolition Wastes, Copper slag and E-Wastes were chosen to replace for aggregate and Bacteria subtilis a spore forming bacteria was used as an admixture to improve the properties of concrete. From the results obtained it has been observed that self-healing technology proves to be the fruitful and considerable increase in mechanical properties.
Real Time Object Detection Using SSD For Bank Security
Authors: Saji Ruhin Mary , Sobhana N V 
Published: February 2021

Abstract
Object detection in real time applications are more challenging and thus faces more difficulties in designing object detection applications. Object detection is a method of identifying predefined objects from images, videos or from other input sources. It consist of different steps for identifying the object from its surroundings. Earlier detection system uses different techniques for objection detection with computationally demanding networks that requires high GPU and needs more power. Considering the current circumstances in the society, it is better to design real time object detection system for security applications. The newly evolved technique such as Tensorflow(TF) along with OpenCV can be used used for object detection. The CCTV footages can be used as input and the monitoring of it can be done inorder to find any security violations. The proposed real time object detection system for bank security mainly aims in providing security to bank vaults. This system can also be used for other security applications where human entry is restricted. The proposed model can be used for different security related applications effectively.
Opinion mining from student text review for choosing better online courses
Authors: Chakravarthy V J , Kameswari M , Mydeen Hakkim Devan , Seenivasan M 
Published: February 2021

Abstract
The process of online assessment has utilized get increased gradually as an evaluating tool in order to measure the lectures performance over Institution of Higher Learning (IHLs). However, these approaches generally have questionnaires sets consists of both quantitative and qualitative whereas the teaching assessment systems for several online lecture have concentrated on quantitative questions part due to its quick analysis. Contrarily, the part of qualitative has needed opinion from students that frequently ignored or misplaced and the opinion results level are omitted. This is due to student’s opinion which is generally in term of unstructured text that made hard to analyze the feedback manually. Moreover, the enormous data amount has produced on daily basis which can be utilized to opinion mining for extracting the student’s opinion in this exact online education area that has not widely applied in all educational system. Therefore, this paper has designed a framework by applying opinion mining concept to the student of coursera online machine learning course as the dataset whereas the comparison is accomplished using opinion mining framework to extract. The unstructured text gets processed and classification results based on polarity to obtain better outcome. Hence, this framework maintain several steps namely opinion extraction, unstructured text processing and polarity classification using NLP. Moreover, the performance of the outcome from the Opinion Mining (OM) gets evaluated using machine learning algorithms.
Electrothermal micro tweezer for biomedical applications
Authors: Joshitha C , Ragavyshnavi D , Sai Priyanka D , Nagarjuna P , Sreeja B S 
Published: February 2021

Abstract
This paper presents design, simulation and results analysis for a novel micro tweezer. The principal element in the proposed device is a double U-beam electrothermal actuator. Using FEM tool, Poly-Silicon material is applied to the device structure and analysed for both in-plane and out of plane displacement for respective range of actuation potential. The micro tweezer holder mouth provided a maximum in-plane displacement of ∼48µm at 4.5V actuation voltage. Comparatively negligible out of plane displacement exhibited by the device during simulation. The proposed micro tweezer is designed for the micromanipulation of biological cells in a better way.
High Gain Patch Antenna using EBG Structures for WiMAX Application
Authors: Bhuvaneswari H B , Konnur Anand C , Vadeyanpur Shambulingappa K 
Published: February 2021

Abstract
One of the ways to achieve high gain in microstrip antennas is by using electromagnetic band-gap (EBG) structures. Incorporating EBG in the design supresses surface waves in the antenna ground plane and also helps in obtaining a uniform field distribution. The main objective of this paper is to obtain a high gain antenna suitable for WiMAX application by simply placing multiple EBG structures on the same plane of patch antenna. A simple microstrip patch antenna with and without EBG structures is designed and simulated using AnsoftHFSSTMsoftware with FR4 substrate having a dielectric constant of 4.4, loss tangent of 0.02 and thickness of 1.57mm at a resonating frequency of 5.6 GHz. The proposed EBG antenna increased the gain by approximately two times when compared with a simple micro-strip patch antenna.
The dependence of the conductivity tensor on electromagnetic waves and laser fields in a quantum well with infinite potential in the case of electrons - optical phonon scattering
Authors: Ngoc Hoang Van 
Published: February 2021

Abstract
There are many studies on low-dimensional semiconductors, including quantum wells. Conductivity tensor is one of the key concepts in materials research. This work studies the dependence of the conductivity tensor on electromagnetic waves and laser fields in a quantum well with infinite potential in the case of electrons - optical phonon scattering. Results are obtained using the quantum kinetic equation for electrons in a quantum well, the particle system is placed in an electromagnetic wave field and a laser field, from solving the quantum kinetic equation yields conductivity tensor expressions.This work also only considers the case of electron scattering - optical phonon and with quantum well there can be infinite potential. The conductivity tensor expression shows its dependence on the electromagnetic wave frequency, laser field frequency, laser field amplitude, and other parameters that characterize the quantum well.A graph of the dependence of the conductivity tensor on electromagnetic wave frequency, laser field frequency, and laser field amplitude will be plotted and examined. The semiconductor investigated here is the GaAs/GaAsAl quantum well.
Survey on metamaterial antennas
Authors: Suganthi J , Kavitha T , Ravindra V 
Published: February 2021

Abstract
Metamaterials are popular in the antenna research area because of their unusual properties. Metamaterials can be used to surpass disadvantages of conventional microstrip antenna such as larger bandwidth, reduction in size of the antenna, better return loss and improvement in gain, directivity with acceptable amount of input power. The main aim of this paper to analyse the best model required to design a patch antenna with respect to the relevant application.