bluuebunny/crossref_metadata_2025_split huggingface dataset:
The influence of a layered-inhomogeneous underlying surface on the antenna pattern
Authors: Yashchenko A S , Krivaltsevich S V 
Published: May 2020

Abstract
The results of works aimed at studying the influence of a flat-layered heterogeneous medium on the type of directional pattern of elementary wave emitter are presented. It was found that a change in the thickness of the frozen soil layer leads to a change in the directional characteristics of elementary emitter. The largest changes in the type of radiation pattern are observed when the thickness of the frozen / thawed layer is a quarter of the wavelength in this medium. It is shown that a change in the type of radiation pattern is also associated with the radiophysical characteristics of the underlying surface on which the antenna is located. The obtained results can be used in the process of optimizing the operation of antenna-feeder devices in conditions of changing the state of the underlying surface.
Approximate kinematic synthesis of the four-bar mechanism by two given positions of the links
Authors: Gebel E S , Chigrinova E A 
Published: May 2020

Abstract
Planar four-bar linkages are widely used in various automatic devices and equipment; therefore, kinematical synthesis methods should be developed in order to reduce the amount of initial data and derived the exact solution using modern mathematical methods. The method of the best quadratic approximation of a function was applied to derive the optimality criterion through the well-known equation for closing a vector contour for four-bar linkage. The obtained mathematical model of kinematical synthesis can be used also to determine the singular positions of the mechanism that can cause a spontaneous change in the law of motion of the output link. Modeling of the proposed kinematical synthesis method using Mathcad confirmed the correctness of the mathematical model and allowed plotting the graphical diagram of connecting rod curves.
Buckling of composite sandwich cylindrical shell with lattice anisogrid core under hydrostatic pressure
Authors: Shatov A V , Burov A E , Lopatin A V 
Published: May 2020

Abstract
Anisogrid structural elements offer significant advantages over conventional stringer-stiffened analogues due to an exceptional strength and stiffness of unidirectional composite ribs, which are used as the main load-bearing elements. The paper presents a numerical solution for buckling of a sandwich cylindrical shell with composite lattice core loaded with hydrostatic pressure. To model the buckling of the shell, the finite element method is used. A parametric analysis on the effect of the number of helical ribs and the orientation angle on the critical hydrostatic pressure is performed. It is revealed that the local, global or coupled buckling modes can be realized in the buckled shell depending on the geometric parameters of the lattice core structure. The parameters at which the shell provides the maximum mass efficiency are determined.
Methods of the analytical construction of diagrams of the vibratory drum vertical movements into the soil for the compacted soil strength assessment
Authors: Tarasov V N , Boyarkina I V , Boyarkin G N , Serebrennikov V S 
Published: May 2020

Abstract
The soil compaction process by a vibratory drum is performed during a slow horizontal progressive movement and high-frequency vertical movements of the vibratory drum by a vibration exciter. Let’s consider the process of a single vertical movement of the vibratory drum into the soil on a horizontal compacted surface. As a result of the vibratory drum progressive movement vertical movements take place on new horizontal areas of compacted soil. The problem of the vibratory drum cylindrical surface vertical indentation into the soil is first presented in a differential form. The stress distribution law as per the soil depth is set taking into consideration the compacted soil layer thickness h
0 and general soil deformation modulus E
0. The relative vertical deformation of elementary soil columns according to Hooke’s law is determined as the ratio of the vertical movement of the vibratory drum elements to the thickness of the layer to be compacted. The analytical integration of equations connecting the vertical load on the vibratory drum with elementary forces of the soil reactions on the vibratory drum bearing surface has been performed. The state of soil strength under the vibratory drum is determined as the initial state σ0 and additional state Δσ, caused by an increase of the soil strength due to the compaction σ=σ0 + εE
0, caused by relative deformation. The problem of the determination of the vibratory drum vertical movement by vertical forces has been solved. Obtained analytical dependences and method allow to construct the dependence diagrams of the vibratory drum movement into the soil on different types of soils. The problem of the vibratory drum vertical movement into the soil has been analytically solved on the basis of the deformation of vertical soil columns in the form of Hooke’s law using the general soil deformation modulus E
0. The vertical interaction of the vibratory drum with the soil has been formulated as the equilibrium problem of the vertical reaction forces along the contact arc. Finite integrals have been obtained connecting the vertical load on the vibratory drum with the parameters of the soil and vibratory drum. The calculation method of the dependence diagrams of loads on the vibratory drum and vertical movements (settlement) of the vibratory drum into the soil has been developed.
Increasing the life of the brush working equipment of a utility vehicle by using a device to control its position
Authors: Tsekhosh S I , Ignatov S D , Demidenko A I , Kvasov I N 
Published: May 2020

Abstract
The article is devoted to the urgent problem of the resource increasing of the brush working equipment of a communal machine. To increase the resource of the brush working body, it is necessary to provide the recommended area of the contact spot of the brush bristles with the surface to be cleaned. This can be done by using a brush position control device. The results of the study of the effect of bristles deformation on the area of contact between the brush working equipment and the surface being cleaned are presented. A variant of the position controlling device of the brush working equipment of a communal machine providing the recommended area of the contact spot between the bristles and the surface being cleaned is proposed. A design diagram of the deformation of the brush working body is presented. As a result of the interaction process analysis between the brush working equipment and the surface being cleaned a relationship is obtained connecting the area of the contact spot with the deformation of the pile. A graph of this dependence is constructed. As a result of the work performed, a relationship is determined that allowing to determine the value of the contact area of the brush working equipment with the surface being cleaned for various values of the bristles deformation taking into account their wear.
Association between thrips and ants on chili and watermelon plants
Authors: Haerul  , Nurariaty A , Nasruddin A , Gassa A 
Published: May 2020

Abstract
Ants have a positive impact on agricultural land as predator on thrips. This study aims to evaluate the association between thrips and ants on chili and watermelon plantations which were conducted in the Maros Regency, South Sulawesi. Samplings of the thrips from the chili and watermelon plants were carried out by using a plastic lid that was placed under the plants, which were then patted by hand until the thrips fall onto the plastic lid and was then counted. The ants were captured using pitfall traps. The results showed that there were two types of thrips, namely Thrips parvispinus and Thrips palmi. The population with the highest average number of thrips was found on farmers’ land averaging at 20.4 thrips, with T. parvispinus averaging at 6.4 thrips/observation and T. plami at 14 thrips/observation. Meanwhile, the lowest average population was found on watermelon plants with only 10.3 thrips/observation with T. parvispinus at 1.1 thrips/observation plus T. plami at 9.2 thrips/observation. The highest ant population was found on chili plants combined with watermelons ie 373.3 ants/observation, while the lowest ant population were found on chili plants on farmers’ land averaging around 104.3 ants/observation. Based on the data, it can be concluded that the ants play a role in reducing the population of thrips.
Statistical Estimation of ideal and realistic muon interaction on Al, Fe, and Cu absorbers
Authors: Norizan M I H M , Hashim I H , Ibrahim F , Ghani N N A M A 
Published: May 2020

Abstract
Interaction of charged muons in various absorbing materials is almost similar to other charged particles. Their behaviour has been observed by various experimental work in material science and nuclear and particle physics. A statistical model is developed in order to study the behaviour of muons after interacting with absorbing material. In this study, ideal and realistic beam structure from high intensity muon facility around the world such as at Japan Accelerator Research Complex, Research Centre Nuclear Physics, Osaka University and Paul Scherrer Institute is assumed. Three absorbing materials (aluminium, iron and copper) with thickness range of 0.00 ˜ 0.12 g/cm2 are used to observe the momentum straggling of the beams. Performance for our model was checked by comparing the value of stopping power with others work for muons with initial kinetic energy of 10-40 MeV with and without including shell effect correction term. The effect of the energy losses towards the beam structure will be discussed.
Development of marine grade radiation cross-linked high density polyethylene (HDPE) floater pontoon material
Authors: Muhammad Sayuti Muhammad Hazim , Razali Meor Yahaya , Abd Rahman Mohd Faizal , Mohammad Shirajuddin Siti Salwa , Ali Mohd Roslie , Mohd On Ahmad Zuhdi 
Published: May 2020

Abstract
Crosslinked High Density Polyethylene (HDPE) was developed using electron beam radiation techniques. The crosslinked HDPE can be used as marine grade cross-linked HDPE floater pontoon material. Thermoplastic resin, HDPE blended with Ethylene Vinyl Acetate (EVA) in various weight percentage compositions before being radiate with electron beams irradiation. These composites showed significant changes in mechanical properties and temperature stability after the irradiations. From this study, the optimum dose for HDPE and HDPE/EVA blends will be obtain. This study also will provide the optimum irradiation dose in order to have a good, high strength and impact for the production of pontoon material. The present of EVA in the blend will act as impact modifier also being investigated in this study. From the study, the result showed some significant changes in thermal and mechanical properties after being irradiated with electron beam. The comparison of the result between these composite composition of irradiated and non-irradiated HDPE composite used for floater pontoon material is presented in this paper
The role of nuclear science and technology (NST) in supporting the implementation of the sustainable development goals (SDGs) in Malaysia
Authors: Rashid F I A , Sali S S M , Kadir A R A , Zolkaffly M Z , Kassim H , Omar M A S , Bakar A Q A 
Published: May 2020

Abstract
The United Nations 2030 Agenda for sustainable development (2030 Agenda) adopted in 2015 has underlined seventeen sustainable development goals (SDGs). The SDGs are used to chart the actions over the next fifteen years (2016-2030) in areas of critical importance for humanity and the planet towards sustainable development. Malaysia is among the countries that have put the SDGs in its development agenda and is on track to achieve the SDGs. Many countries including Malaysia use nuclear science and technology (NST) to meet their development objectives in various areas including food and agriculture, industry, human health, energy, water management, and environmental protection. The use of NST can help to achieve nine of the seventeen SDGs. This paper aims at highlighting the role of nuclear science and technology in supporting the implementation of the SDGs in Malaysia.
Evaluation of default mode network in temporal lobe epilepsy patients and healthy subjects: a preliminary result
Authors: Shuhada JM , Husbani MAR , Hamid A I A , Muhammad AR 
Published: May 2020

Abstract
The default mode network (DMN) is thought to be impaired in epileptic patients, where the functional integrity of its core regions compromised. Fourteen healthy participants and fourteen aged and gender-matched patients with temporal lobe epilepsy (TLE) took part in this study. The resting-state fMRI (rsfMRI) imaging protocol was executed using a 3-T Phillips Achieva MRI scanner at the Department of Radiology, HUSM. The TLE patient displays decreased activation clusters in precuneus and supramarginal gyrus compared to the healthy group. However increased activation clusters were found on middle frontal gyrus, superior temporal gyrus, and angular gyrus compared to healthy subjects. The result from random effects (RFX) on healthy TLE revealed that the left middle frontal gyrus, bilateral superior temporal gyrus, bilateral precuneus, and right supramarginal gyrus were significantly activated but the NOV survive was so small. The findings suggested that TLE patients suffer from impairment in some DMN region, which may cause certain neuropsychological and cognitive degradation.
Internal fire probabilistic safety assessment preliminary work at research reactor TRIGA PUSPATI
Authors: Hashim Zaredah , Kumar Devintharaaj , Zakaria Mohd Fazli , Hussain Mohd Huzair , Sallehudin Mohd Sarif Ahmad Hassan , Maskin Mazleha 
Published: May 2020

Abstract
An internal fire analysis Level-I probabilistic safety assessment (PSA) for TRIGA PUSPATI (RTP) nuclear research reactor was initiated. Previous study on half-scope mode Level-I PSA, focusing only on internal initiating event, were developed for both full power and shutdown operational mode. Hence, in ensuring PSA remains relevant, a subsequent study to kept PSA up to date is a compulsory. The aim of this study is to present the step-by-step work done and the insights gained in identifying and screening significant compartments that are potential to had the worst consequences as an ignition sources. This preliminary study will only focus on RTP’s basement which consist of 3 compartments: switch room, battery room and basement hall. Procedure in data collection were based on IAEA document, Specific Safety Guide No. 3: Development and Application of Level 1 Probabilistic Safety Assessment for Nuclear Power Plants (SSG-3). Microsoft Excel was used as data collection media and internal fire hazard database development. A brief qualitative analysis using failure mode and effect analysis is also presented.
Polarization mechanism and Shockley Read Hall recombination on Quantum Efficiency of InGaN/GaN Blue LED
Authors: Anchal Neha , Sahoo Bijay Kumar 
Published: May 2020

Abstract
InxGa1-x N/GaN blue LEDs faces significant efficiency droop issue. The causes of efficiency droop are Shockley Read Hall recombination (SRH), Auger recombination (AR), carrier delocalization (CD) and electron leakage (EL). The SRH, Auger and electron leakage are functions of carrier concentration and temperature. InGaN/GaN superlattice has polarization electric field at interface. In this work we explore effect of built in polarization (BIP) on efficiency droop. It is shown that polarization field enhances SRH coefficient resulting in more droop in internal quantum efficiency of blue LED. Thus, for improvement in efficiency, polarization field required to be minimized which requires growth of the material in m-plane instead of c-plane.
Effect of temperature on electron leakage and efficiency droop of AlxGa1-xN UV LED
Authors: Sahare Priyanka , Sahoo Bijay Kumar 
Published: May 2020

Abstract
AlxGa1-x N UV LED is a promising light source for water purification, diagnosis and sterilization of medical equipment’s, document authentication, security checking and general lightings. The device suffers from efficiency droop due to a number of factors like Shockley Read Hall recombination (SRH), Auger recombination (AR), electron delocalization (ED) and electron leakage (EL).In this work, effect of temperature on electron leakage and efficiency droop of AlGaN UV LED is investigated. It is found that electron leakage takes place at high injection current and high temperature. Electron leakage can be reduced by minimizing self-heating effect in the AlGaN UV LED.
Influence of defect density and layer thickness of absorption layer on the performance of tin based perovskite solar cell
Authors: Roy Priyanka , Sinha Numeshwar Kumar , Tiwari Sanjay , Khare Ayush 
Published: May 2020

Abstract
The tremendous progress exhibited by Perovskite solar cells (PSCs) within the decade has made PSCs the fastest growing PV cell to date. The PSCs has exhibited increment in power conversion efficiency (PCE from 3.2% to 25.2% within a decade. In PSCs, usually MAPbX3 (X being Cl, Br and I) layer is used as an absorber layer. The incorporation of toxic Lead (Pb) is a matter of concern by some of the researchers. In order to deal with this Tin (Sn) is being used as an alternative of Pb. However, the performance of Sn based PSC still lags behind Pb based PSC. In this work, we demonstrate an efficient Sn based PSC with JSc of 32.6398 mA/cm2, Voc of 0.8946V, FF of 80% and PCE of 23.4%. The results exhibits the potential of Sn based PSCs which is not only efficient but also is environmental friendly. We study the impact of defect density and layer thickness of absorber layer over the performance of Sn based PSC. An analysis on the effect of doping in Electron Transport Layer (ETL) and Hole Transport Layer (HTL) over the performance of Sn based PSC is also conducted.
A First principle study of structural and electronic properties of ZnO and ZnS Buckyball structures
Authors: Sharma Sakshi , Shrivastav A K , Oudhia Anjali , Verma Mohan L 
Published: May 2020

Abstract
The nanostructured ZnO and ZnS in Buckyball form have been optimized using first-principle density functional (DFT) approach. For an improved understanding of the systems, investigation of their structural and electronic properties are performed. Study of Density of states (DOS) and partial density of states (PDOS) are carried out. The system obtained a well near reported values of energy and bond length, done previously. DFT study was found to be very much compatible with the theories of solid-state physics. This study provides a good comparison between the properties of ZnO and ZnS buckyball structures, which is reported for the first time. The study may be useful for group II-VI elements based applications on various fields such as OLEDs, Photovoltaics, sensors, biomedical applications etc.
Structural, Electrical and Magnetic Properties of Mechanothermally Synthesized Bi (Co0.45Ti0.45Fe0.10)O3 Nanoceramic
Authors: Kumar Nripesh , Shukla Alok , Kumar Nitin 
Published: May 2020

Abstract
High-energy ball mill was exploited to synthesize Bi(Co0.45Ti0.45Fe0.10)O3 nanoceramic, followed by solid-state cramicmethod. XRD (X-ray diffraction), SEM (scanning electron microscopy) and impedance spectroscopy methods were exploited to analyze elementary crystal structure, micrograph and comprehensive electrical characteristics of the as -synthesized nanoceramic. The impedance spectroscopy technique offered many exciting outcomes on the influenceof grain and grain boundary on the total resistiveproperties of the nanoceramic. The trend of frequency dependence of a.c. conductivity follows Jonscher's power law. The upgraded conductivity and dielectric property propose various applications in the embedded capacitors. PE loop tracer and VSM (Vibrating sample Magnetometer) were exploited to study the ferroelectric and magnetic characteristics of the synthesized nanoceramic. The B-site modified BiFeO3 (with Co and Ti) exhibit ferroelectric and magnetic behavior at room temperature.
Parametric uncertainty quantification in natural frequency of sandwich plates using polynomial neural network
Authors: Karsh P. K. , Raturi H. P. , Kumar R. R. , Dey S. 
Published: May 2020

Abstract
In this paper, uncertainty quantification in natural frequencies for laminated soft core sandwich plates is presented by employing finite element (FE) coupled polynomial neural network (PNN) approach. The computational efficiency and accuracy is achieved by using PNN as surrogate model. Latin hypercube sampling method is employed for training of data in PNN model. The stochastic first three natural frequencies of sandwich plates are studied for individual variation in input parameters. The stochasticity in individual input parameters are considered in order to assess their influence on global response of the structure. The algorithm discussed in this article is observed to be converging with the previously published literature (for deterministic case) and validated with full scale Monte Carlo simulation (MCS) i.e. original finite element approach (for stochastic case). The computational time and cost reduced significantly by employing the present surrogate based FE approach compared to that of conventional Monte Carlo simulation approach.
Study of the Radiotherapy Treatment Margins in Prostate Cancer with Fuzzy Logic Model
Authors: Patnaikuni S K , Saini S M , Chandola R M , Choudhary V 
Published: May 2020

Abstract
Start your abstract here…External beam radiation therapy (EBRT) is a process in which therapeutic radiation dose is delivered to targettissues whilst seeking the risk of healthynormal and critical organs is minimal. In case of Complex radiation therapy technique such as volumetric modulated arc radiotherapy (VMAT), there is requirement of precise and optimal treatment margin selection so that not only the resulting dose distributions gives high tumor control probability(TCP) but also dose close to critical organs will get minimal. A fuzzy logic application was used here to derive the optimal radiotherapy treatment margins to be used in radiation therapy treatment planning. Here major all possible radiotherapy uncertainties accounted such as translational set-up, organdelineation and organ motion-induced errors for calculating the quantitative variations in target volume radiobiological parameters for treatment plans using fixed step sized increments of treatment margins up to maximum possible variations of tumor volumes. Therules and membership functions were adopted from dosimetricresults of treatment planning for the fuzzy inference system. The imprecision and smoothness of the original fuzzy output was corrected with application of a convolution technique. The results demonstrate that performance of the applied fuzzy model margins against current used radiotherapy margins was consistent inlower range of error magnitude but beyond that a significant non-linearly margin performance was found when considering the normal tissue complication probability (NTCP) and constraint factors into account in the margin recipe formulation. With the new margins obtained then applied for the study of prostate cancer treatment planning and results were compared well with current volumetric modulated arc radiotherapy (VMAT)technique.