bluuebunny/crossref_metadata_2025_split huggingface dataset:
WashingDurability:A Study onbrush painted JuteMaterial based Monopole Antenna for On-body Communication Applications
Authors: Ram Sandeep D , Prabakaran N , Madhav B T P , Annapoorna D V S , Sai Prakash Reddy K , Sai Deekshith V , Salma S 
Published: March 2021

Abstract
This work is intended for developing a miniaturized wearable textile antenna on the jute fabric of dimensions 20×16 mm2. The proposed antenna operates at 3.5, 4.9, and 5.8 GHz with circular polarization in all the operating bands. As part of the user's outfit, the antenna must be flexible and accommodate the wearer's clothing; for this purpose, the jute fabric in felt form is selected as a suitable substrate because of its durability andflexibility. The proposed antenna is built to withstand regular washing in the machine wash. The prototype is subjected to recurrent machine wash tests under different waters, such as soft water, hard water, and saltwater. After each wash cycle, the antenna is tested for validation. The results from all different washing conditions reveal that the antenna functions with minimal variations in the resonating frequencies. The proposedantenna's lifetime after frequent machine washing in different water conditions is also calculated using the electrochemical workstation; the results show the propounded textile antenna's robust performance.
Consideration of doses to some OARs depending on differently chosen CTV margins of lymph nodes in EBRT treatment of the stomach cancer
Authors: Osmić H , Đedović E , Marošević G 
Published: March 2021

Abstract
Based on the computed tomography (CT) images it is not possible to see all the lymph nodes that belong to the stomach. In radiotherapy, for a clinical target volume (CTV) delineation based on CT images, it is necessary to determine the appropriate margin around the corresponding blood vessels to make sure that all the required lymph nodes will be irradiated. The larger margin will certainly cover all the lymph nodes but it can also produce an increase of the received dose in the normal tissues. While a smaller margin can eventually spare the normal structures as a consequence it brings a higher risk of missing the suspected lymph nodes. The aim of this study was to analyse the radiation doses received by some organs at risk (OARs) in the case of the three-dimensional conformal radiotherapy (3DCRT) treatment of the gastric cancer, for lymph node CTV margin sizes 5 mm, 7 mm and 10 mm. The study included 40 patients undergo the external beam radiotherapy (EBRT) treatment of gastric cancer. The one-way analysis of variance (ANOVA) with repeated measures test and Friedman’s nonparametric test have been used for testing the statistical significance of differences among the examined groups. The difference between the examined groups has been considered significant if p < 0.05. The statistically significant differences in the dose contributions to the observed OARs (spinal cord, heart, small bowel and colon), among the examined CTVs, were found.
The relationships between the total volumes of OARs and the doses they received in the case of EBRT treatment of the prostate cancer
Authors: Osmić H , Đedović E , Emić M 
Published: March 2021

Abstract
In the case of the external beam radiotherapy (EBRT) treatment of the prostate cancer there exist two categories of toxicity effects: genito-urinary and gastro-intestinal. The main objective of this work is to investigate the relationships between the total volumes of organs at risk (OARs) and the doses they received in the case of the EBRT treatment of prostate cancer. Knowing these relationships it could be possible to reduce the dose contributions to the OARs by increasing or decreasing their volumes by the intake of an amount of a fluid or applying a special diet during the EBRT treatment and, consequently, in such a way to decrease the possibility of appearing of toxicity effects. Through this work the results obtained by analysis of the data collected from dose volume histograms of 30 patients have been presented. The correlations between the doses received by bladder and rectum and theirs volumes have been investigated. We found the strong significant Pearson’s negative correlations, obtained in the case of bladder between D
mean and the volume ratios V/V
PTV (r = -0.729 and r = -0.707, p < 0.01) as well as between V
65 and V/V
PTV (r = -0.627 and r = -0.605, p < 0.05). In the case of rectum only significant positive Spearman’s correlation was found between D
max and V (r = 0.524, p < 0.05). The obtained results impose the necessity for monitoring and applying a special and planned diet, as a part of the whole EBRT treatment of prostate cancer in order to ensure the reproducible conditions for OARs.
The use of energy routers to improve reliability of power supply to non-traction consumers
Authors: Bulatov Yu N , Kryukov A V , Kryukov A E , Cherepanov A V 
Published: March 2021

Abstract
The purpose of the studies presented in the article was to determine the effectiveness of the use of energy routers (ER) in railway power supply systems to increase the uninterrupted power supply to non-traction consumers, reduce unbalance and nonsinusoidality, and reduce voltage dips in emergency modes. The research was carried out by means of computer modeling using the Matlab software system based on the developed models of power supply systems (PSS) equipped with ER with energy storage devices. The results obtained show that in standard circuits of PSS for linear consumers with short circuits in the supply network, voltage dips occur, the depth of which reaches 100%. The use of an ER and an energy storage device connected to DC buses allows maintaining voltage at consumer clamps near the nominal value in case of short circuits in the 10 kV feed line and 25 kV overhead contact system. The ER significantly limits the recharge of the short circuit location from the power storage. In addition, on the basis of the ER it is possible to provide the normative quality of electricity considering voltage deviations, asymmetry and harmonic distortions on the 0.4 kV buses of the substation that feeds non-traction consumers.
Influence of the exhaust gas recirculation on formation of NOx in the hydrogen engine working on the leaked mixture (Experiment and 3D modeling)
Authors: Kavtaradze R Z , Natriashvili T M , Glonti M G , Sun Baigang , Wang Yichun , Rongrong Cheng , Citian Chang 
Published: March 2021

Abstract
Summary. Nitric oxides are the only components from the harmful ones limited by the legislation found in the exhaust gases of the hydrogen engine. For the purpose of their minimization and prevention of the anomaly burning processes as well (detonation combustion, early ignition, back fire), the use of the leaked hydrogen-air mixture is offered. The influence of the exhaust gas recirculation (EGR) on the intra-cylindric processes, namely on formation of nitric oxides in the hydrogen engine is studied for the first time experimentally and with the help of the mathematical model based on the three-dimensional non-stationary equations of type of Navier-Stokes. The results obtained for the wide ranges of variation of the advance angle of ignition, excess air ratio and rate of EGR confirm that at successful combination of these controllable parameters the problem of minimization of nitric oxides exhausted by the hydrogen engine is removed.
Lightweight concrete based on foam glass gravel: composition, structure and properties
Authors: Sopegin G V 
Published: March 2021

Abstract
The article discusses the research results, the purpose of which is to provide the possibility of increasing the physical and mechanical as well as heat-shielding properties of lightweight cement concrete based on foam-glass gravel. The authors also investigated the possibility of reducing the alkali-silica reaction occurring in such concretes. To evaluate the course of the alkali-silica reaction, a method is used based on the study of the microstructure of lightweight concrete samples. The article also assesses the physical and mechanical as well as thermal engineering properties of lightweight concrete based on foam-glass gravel. The determination of properties is carried out according to standard methods. Analysis of the microstructure lightweight concrete samples allowed to fix flowing alkali-silica reaction. To reduce the alkali-silicate interaction, the authors propose introducing into the concrete composition a complex additive consisting of a siliceous modifier and a plasticizing component. The developed compositions of lightweight concrete, belonging to the class of structural and thermal insulation, have a compressive strength of 6.84-9.05 MPa, a density mark grade of D500-D1500 and a thermal conductivity of 0.218-0.282 W/(m°C).
Influence of dynamic loads in joints on dimensional stability
Authors: Yamnikov A S , Malikov A A , Kashmin O S , Troitsky I D 
Published: March 2021

Abstract
In small arms manufacturing the lock dimensional chain final link precision is secured with manual file fitting and removing the tolerance intentionally left on the recoil lugs. The manual process reduces the contact stiffness of the lock components, and the final link dimension (between the cylindrical gauge end that simulates a cartridge, and the breeching lock face) set during the assembly is distorted when the breech lock components are exposed to shot impact loads. For this reason, the cylindrical cartridge dummy used for the initial assembly is sized to allow for subsequent plastic deformation at the breech lock component interfaces. The deformation value is determined experimentally on an ad hoc basis. Polynomial expressions have been obtained experimentally for the interface plastic deformation vs. relative positioning errors and surface finish relation for parts made of typical military steel grades. To study the relation between the interface surface machining methods and contact stiffness flat specimens, 50RA steel quenched to HRC 40…45 (the roughness Rz
is 10…15 μm) were machined as follows: peripheral pregrinding; flank milling; file crosswise (at 45°) movements. The results generated after processing the measurements made with a HOMMEL TESTER W55 instrument show that finish flank milling yields the best results.
Modelling of normal pressures distribution in a polymer-made orthopaedic insole for plantar fasciitis treatment
Authors: Gorokhova N M , Perepelkina S Y , Kovalenko P P 
Published: March 2021

Abstract
This research is aimed at the developing an optimal design of orthopaedic insole for plantar fasciitis treatment. This article presents a brief description of the experiment performed to analyse the pressure distribution in human foot, and describes the necessary calculations made for the insole construction A mathematical model was built after the experiment and its further correction was performed, using machine learning algorithms. After the correction of the model, the polymer properties were analysed. The results of the analysis show that to perform the optimal unload of the loaded foot segments there is a need for a polymer thickness change. The respective analysis was performed and a necessary polymer thickness alteration range (1-2 mm) was introduced.
Superconducting lines cable inputs. Thermal processes modelling
Authors: Firsov V P , Yakovlev A A , Golovanov D V 
Published: March 2021

Abstract
The article considers the thermal state in the basic elements of a cryogenic energy transfer line with high-temperature superconductors. The temperature fields distribution in the heat-stressed elements of the cryogenic energy transmission line with high-temperature superconductors depends on the methods of supplying the cryogenic coolant to cable cryostats and current leads. A large contribution to the total heat flux, especially in cable power lines of short length, falls at the current leads. Computations of complex real current lead structures consist in the joint solution of the hydrodynamics and heat transfer equations for the flux, and the energy equation for the wall. The article considers a three-dimensional non-stationary motion of weakly compressible media (gas and liquid) with a free surface in a semi-closed volume at Mach numbers up to 0.3. The mathematical model is based on the Navier-Stokes equations and total enthalpy. These equations are being solved in conjunction with the equation of state for gas or liquid, the equations for the low Reynolds k-ε turbulence model, and the three-dimensional energy equation for the wall. Recently, Flow Vision application package, or specially designed software are being used for complex three-dimensional thermal calculations.
Simulation the motion of a viscous fluid containing graphene plates in the gap between static and rotating stepped discs
Authors: Alhilo Z , Baranov A , Pershin V 
Published: March 2021

Abstract
The motion of a viscous fluid containing graphene nanostructures in a thin gap between a stationary stepped stator and a rotating stepped rotor is considered. Dependences are obtained for calculating the parameters of motion of an elementary volume of a viscous liquid. Using the Maple mathematical package, characteristic trajectories of movement of elementary volumes of fluid in the gap are obtained. A similar idea of the movement trajectories of an elementary volume was obtained using computational fluid dynamics using the Flow Vision package (TESIS, Russia). The transition from a mathematical description to a computer model makes it possible to take into account changes in the viscosity of a liquid caused by a change in the concentration of graphite in the initial suspension. The use of a computer model opens the way to modeling the mixing of graphene nanostructures with a viscous liquid.
Study of the process of forming large-sized thin-walled parts
Authors: Demyanenko E G , Popov I P , Yu Kosolapova A 
Published: March 2021

Abstract
A method for producing large-sized parts of the bottom type, based on flanging processes, is considered. The method includes three operations for flanging different parts to be welded into a part. This allows flanging processes to be carried out using both the geometric and power characteristics of the Schuler press. The results of modeling different parts of a part with a minimum thickness difference are presented. The parameters of the flanging processes are determined.
Fractal model of structure-properties effect of low carbon steel
Authors: Volchuk V M , Uzlov O V , Puchikov O V , Ivantsov S V , Tiutieriev I A 
Published: March 2021

Abstract
Fractal theory has been used for predicting of microstructure (ferrite, pearlite and non-metallic inclusions) effect on mechanical properties (KCV60, a0.2, crB, S) of S355J2 steel. The fractal model which has been obtained may be considered as additive database. The database can be complemented by different treatment modes and microstructure. It has been stated that good response of structure-properties has been obtained for strength characteristics (a0.i crB) of S355J2 steel and fractal size of lamellar pearlite. Also, correspondence of elongation to fractal size of ferrite has been obtained. As it has been determined the better correspondence of fractal size of non-metallic inclusions defined to impact toughness of S355J2 steel. The results have been confirmed by effect of low carbon steel microstructure on mechanical properties of the steel. The histogram of microstructure and non-metallic inclusions effect on mechanical properties of S355J2 steel has been plotted.
Experimental verification of the of contamination reduction of silicon during electron beam melting due to the use of a gas-dynamic window
Authors: Kravtsov A , Chikvaidze G 
Published: March 2021

Abstract
Metallurgical process of producing initial rods for FZ silicon single crystal application was described before. Purity of pulled ingots was satisfied, but some impurities level was over required level. Concentrations of these impurities such Fe; Cr; Cu; Al; O2 been decreased by gas dynamic window and electric trap in laboratory scale equipment. Present article described results of experiments on industry scale equipment with application gas dynamic window for purifying indicated impurities in initial rods and results received in FZ silicon single crystals, grown from that rods, for concentrations of Aluminum and Oxygen.
Formation of a composite structure in Ti-Cr alloys using reversible hydrogen alloying
Authors: Skvorcova S V , Zaynetdinova G T , Afonina M B , Ya Anackaya A 
Published: March 2021

Abstract
The aim of this work is to study the regularities of the influence of hydrogen doping on the course of phase and structural transformations in Ti-Cr alloys. The influence of the amount of hydrogen on the preferred sites of intermetallic separation was studied. The influence of hydrogen on the lines of variable solubility of the state diagram Ti-Cr is studied. The possibility of controlling the process of structure formation in titanium alloys with p-eutectoid-forming stabilizers by additional alloying with hydrogen and obtaining such types of structures that are not typical for them with traditional methods of technological influence is shown.
Composites based on polypropylene and Georgian minerals
Authors: Aneli J , Gventsadze D , Shamanauri L , Chkonia A M , Samkharadze Z V 
Published: March 2021

Abstract
Polymer composites on the basis of secondary polypropylene and high dispersive powders of minerals wide spread in Georgia (andesite, quartz sand and a slam) were obtained and investigated their some physical-mechanical, thermal and hydrophobic properties. It is shown that the ultimate strength, and thermal stability extremely depend on the filler concentration and at definite significant of the concentration have maximums. For the composites with binary fillers (quartz sand/slam, quartz sand/andesite and slam/andesite) revealed synergistic effect of anomaly increasing of the ultimate strength at definite proportion of fillers. It is established that modification of the mineral fillers with tetraethoxisilane enhances technical characteristics of the composites.
A multistage heat pump unit model for reducing energy consumption of space heating at low ambient temperatures
Authors: Kosoi A S , Antipov Y A , Shkarin K V , Shatalov I K , Sokolov D D 
Published: March 2021

Abstract
Air heat pump units (HPUs) for space heating are used more widely than geothermal ones, mainly due to lower installation costs. The main disadvantages of geothermal installations are their low productivity and coefficient of performance (COP). In this work, a multistage heat pump unit with an air source was modeled, which lead to reduce in the energy consumption of the compressors in all of the HPU stages at an ambient temperature of -30 ° C and a heating temperature from 20 ° C to 65 ° C. Wherein, the COP of the modeled multistage HPU in all modes is 20% higher in comparison with a two-stage HPU considered in the literature review. In addition, the influence of the decrease in the ambient temperature on the increase in the energy consumption of the first stage of a multistage HPU was presented in this work.
Triangular finite element in a mixed formulation for a flate problem of elasticity theory
Authors: Gureeva N A , Ryabukha V V 
Published: March 2021

Abstract
Annotation. The algorithm for obtaining the stress-strain state matrix of a triangular finite element in a mixed formulation for calculating elastic structures under flat stress and flat deformation is analyzed. The nodal unknowns are assumed to be displacements and stresses. Approximation of desired quantities through the nodal values was carried out pelenanie functions. The stress-strain state matrix is obtained on the basis of a functional that reflects the equality of the actual work of external and internal forces when replacing the actual work of internal forces with the difference between the total and additional work of these forces. The calculation example shows the specificity of the algorithm.
Study of the influence of discharge loop parameters on anode side on generation characteristics of metal plasma jet in a pulsed vacuum discharge
Authors: ZHANG Wenjun , LIU Wenzheng , TIAN Jia , GAO Yongjie , JIANG Xitao , LIU Pengxiang 
Published: March 2021

Abstract
In a pulsed vacuum discharge, the ejection performance of a metal plasma jet can be effectively improved by preventing charged particles from moving to the anode. In this paper, the effects of resistance and capacitance on the anode side on the discharge characteristics and the generation characteristics of plasma jet are investigated. Results show that the existence of a resistor on the anode side can increase the anode potential, thereby preventing charged particles from entering the anode and promoting the ejection of charged particles along the axis of the insulating sleeve nozzle. The application of a capacitor on the anode side can not only absorb electrons at the initial stage of discharge, increasing the peak value of the cathode hump potential, but also prevent charged particles from moving to the anode, thereby improving the ejection performance of the plasma jet. In addition, the use of a larger resistance and a smaller capacitance can improve the blocking effect on charged particles and further improve the ejection performance of the plasma jet. Results of this study will provide a reference for the improvement of the ejection performance of plasma jets and their applications.
Increases in Risky Drinking During the COVID-19 Pandemic Assessed via Longitudinal Cohort Design: Associations With Racial Tensions, Financial Distress, Psychological Distress and Virus-Related Fears
Authors: Lechner William V , Sidhu Natasha K , Jin Jackson T , Kittaneh Ahmad A , Laurene Kimberly R , Kenne Deric R 
Published: March 2021

Abstract

Background
The COVID-19 pandemic has created disruptions to daily life resulting in wide-spread unemployment and psychological distress. Recent studies have reported high rates of alcohol use during this time; however, longitudinal data remain scarce and factors associated with increases in high-risk drinking observed over time are unknown.

Aims
The current study examined changes in high-risk drinking patterns across four 7-day observation periods, prior to and following a university wide campus closure. Additionally, factors associated with changes in alcohol use patterns were examined including financial distress, psychological distress, impact of racial tensions and virus-related fears.

Method
Students (N = 1001) in the Midwestern USA completed repeated assessments between March and June 2020. Each survey included a timeline follow-back measure of alcohol use. Pandemic-related distress spanning several factors was assessed at the final follow-up.

Results
Risky drinking patterns increased significantly over time. Overall, psychological distress and impact of racial tensions were associated with higher rates of risky drinking, whereas COVID-19-related fears were associated with lower rates. However, only financial-related distress was associated with an increase in risky drinking patterns over time.

Conclusions
Increased risky drinking patterns observed in the current study may signal problems that are likely to persist even after the direct impact of the COVID-19 pandemic on daily life ends. Individuals experiencing financial distress may represent a particularly high-risk group. Interventions targeting the cross-section of job loss, financial stress and problematic alcohol use will be important to identify.