bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of the Process of Unloading of Iron Ore Raw Materials: The Case of a Steel Plant
Authors: Popov A. T. , Suslova O. A. , Voronkova E. A. 
Published: December 2020

The process of unloading iron ore raw materials of the metallurgical plant to the sinter plant has not been considered for a long time as a particular topic. Over the last years the conditions of metallurgical production have undergone certain changes: its intensification has occurred, which entails the need to re-evaluate parameters of stable operation of sinter production. The objective of the suggested study is to consider the issues of possible technical and technological improvement harmonizing transport flows with the requirements of the main production process. To achieve this goal, a technique of mathematical modelling is used, based on the mathematical apparatus of linear programming; graphic-analytical method; method of probability theory.The issues of the process of unloading, storage of iron ore raw materials, of their preparation for sinter production are primarily considered.The article presents the main positions of the process of optimizing unloading of sinter batch of a metallurgical plant.The general characteristics of the technology of metallurgical production and of each particular process are described. The agglomeration process is considered in more detail. The tables of initial iron ore raw materials for sintering production for certain reporting periods are given, for the sake of clarity, the data of one of the tables are summarized in a diagram. A diagram of a standard trestle-type ore warehouse is considered, which sequentially shows the main processes of sintering production from supply of raw materials to the car dumper to getting through a belt conveyor into a stack, and then into receiving bins. The article also provides an example of formation of piles of iron ore raw materials using manganese limestone.The study is based on a dynamic transport problem with delays (DTPD), which considers time of transportation of goods, the dynamics of production volumes over time, the dynamics of consumption, the dynamics of stocks of suppliers and consumers, dynamics of cost of transportation and storage, dynamics of cost of consumption losses. The study contains several mono-problems with a mono load, which overlap each other, forming a multiplicative overlay of single-product problems.
Enhanced Security of Unmanned Aerial Vehicles Operations at Transport Infrastructure Facilities
Authors: Shvetsova S. V. , Shvetsov A. V. 
Published: December 2020

Unmanned aerial vehicles (UAV), also known as drones, are gaining more and more practical application in modern society, particularly as the tools of implementation of the concepts of «smart city», «smart health care», «smart industries», Internet of Things, 3D mapping, digital transport. But currently it is impossible to use of UAV at certain objects, comprising objects of transport infrastructure (OTI), primarily, airports, because of existing restrictions due to security threats arising during the UAV flight.The authors of the present work have set a goal to offer a solution that allows to start operating UAV at transport infrastructure facilities that are currently prohibited for UAV flights. To achieve the objective of the work, using analysis and synthesis, comparison and generalization, factors and conditions for safe use of UAV at OTI have been formulated, a method for increasing security of UAV flight has been developed, followed by the suggestion on the UAV route control system.The proposed system makes it possible to safely use UAVs at OTI by restraining their flight area strictly to the designated corridor, which eliminates a threat of a collision of UAV with other vehicles operated at OTI, dangerous elements of OTI, as well as with people at the object.The system does not need electric power feeding, which makes it possible to implement the system without creating an auxiliary power supply infrastructure.The practical application of the proposed system and, as a consequence, implementation of a greater number of opportunities for the use of UAV, are capable to generate fundamentally new technological processes and structures at transport facilities, which is one of the directions for creating the next generation transport infrastructure based on IoT and artificial intelligence.
Estimation of Travel Time Spending by Urban Transport Passengers
Authors: Spirin I. V. 
Published: December 2020

The objective of the article is to obtain dependencies linking time spent by passengers on travel by public transport with the main factors that form the elements of this time spending. The research used methods of analytical modelling, mathematical and transport statistics, survey, analytical and logical analysis, methodology of transport research.Mathematical models for estimating passenger travel time in cities using public transport are considered. Attention is drawn to formation of each of the elements of travel time and to the relationship of these elements with each other. Such elements comprise time of walking to the stopping point of departure and of walking from the stopping point of arrival to the destination of the trip; waiting time for boarding a vehicle; travel time spent in a vehicle along the route. The dependences of these elements on the factors that form time spending have been identified. The increase in time spent waiting for boarding a vehicle is investigated depending on reduction in the planned number of vehicles due to breakdowns. The above models can be used in transport planning and assessing quality o f public transportation in terms of passenger travel time.
Study of Performance of RZhFA‑6500 Smoothing Reactors
Authors: Lobyntsev V. V. , Polev S. S. , Mogilevsky K. G. 
Published: December 2020

DC traction power supply systems have become widespread in several countries. Electricity consumption by traction power supply systems has pronounced seasonal and daily peaks. The peak nature of consumption leads to additional heating of live parts since time constants of transient thermal and electrophysical processes differ by several orders of magnitude, therefore, reducing ohmic resistance of electrical equipment, other things being equal, is an extremely important task.Within the framework of solving the problem of increasing energy efficiency of equipment of DC traction substations, smoothing reactor filter devices with an armoured radial-cylindrical magnetic core with low ohmic resistance, named RZhFA‑6500, were developed and manufactured.In 2018, two blocks of RZhFA‑6500 smoothing reactors were put into pilot operation at one of the most heavily loaded sections of DC electrified railways, providing traffic of trains weighing up to 9000 tons and traffic volume of about a hundred pairs of trains per day.To determine comparative indicators of energy efficiency, data on consumption of electric power for traction of trains for the compared periods before and after introduction of smoothing reactors of a new type were requested. The data received from JSC Russian Railways contained information on the traffic volume, type of rolling stock, and weight of the transported goods in accordance with the executed traffic schedule through section under consideration. The resulting set of data served as the basis for development of a multivariate methodology for assessing energy efficiency of reactors of a new type, as well as their contribution to efficiency of train operation over the considered comparative time interval. Since efficiency of power equipment also depends on the ambient temperature, the average integral parameter of average daily temperature was introduced into the calculation methodology, which, as it turned out, during processing initial data and construction of characteristic graphical dependencies, has a comparative difference of less than one percent for the same monitored periods.Accurate quantitative accounting of the data on consumption of electrical energy provided for traction of trains, exchange of reactive energy with the supply network, volume of transportation allowed to obtain an objective comparison of contribution of smoothing reactors of a new type to increasing efficiency of train operation and reducing consumption of electrical energy for traction of trains.
Estimation of Evaporation Losses of Bunker LNG
Authors: Tarovik O. V. , Reutsky A. S. , Topazh A. G. 
Published: December 2020

Analysis of efficiency of transport systems using liquefied natural gas (LNG) as fuel is impossible without a comprehensive understanding of the volumes of fuel LNG losses from evaporation during main technological operations: transportation (storage), bunkering, and cool-down of fuel tanks. Despite active development of water and land natural gas vehicles, practical approaches for obtaining appropriate estimates in a wide range of characteristics of cargo tanks have not been previously published.The objective of this work is to analyze LNG losses in road, rail and ship tanks (with a capacity of up to 5600 m3), as well as in tank containers, provided that LNG is stored with an overpressure of about 5–7 atmospheres.In the work, numerical modelling was used as a method. The evaporation process of LNG is described using models of heat exchange between the liquid phase of LNG, its vapours, as well as a cargo tank and the external environment. This makes it possible to simulate the behaviour and phase transformations of LNG during its storage in a tank, as well as during main technological operations. Numerical modelling of thermodynamic processes during storage of LNG is performed using a computer simulation model implemented in AnyLogic environment. Quantitative estimates of LNG losses during bunkering and cool-down of fuel tanks were obtained based on analytical calculations.An analysis of sensitivity of the created models to various parameters, as well as massive numerical calculations, made it possible to construct regression relationships to determine LNG losses during operations under consideration. The obtained dependencies can be used to search for the most effective configurations of the system for low-tonnage LNG transportation, as well as to perform economic assessments of feasibility of using LNG as fuel for water and land transport.
Self-esteem dan resiliensi sebagai prediktor penyesuaian diri mahasiswa baru di Indonesia
Authors: Faizah Faizah , Marmer Farica Veronica , Aulia Nadhirah Nurul , Rahma Ulifa , Dara Yuliezar Perwira 
Published: December 2020

AbstractStudents who continue their education to higher education will find a variety of changes, new challenges, demands, and greater responsibilities. This transition can put pressure on new students and negative results if they cannot pass it. The purpose of this study was to determine the role of self-esteem and resilience towards the adjustment of new students. Determination of the sample using accidental sampling technique with a sample of new students in the first semester who are actively enrolled in state or private universities (N = 673). Measuring instruments used are the Rosenberg Self-esteem Scale-Revised with reliability .836, Brief Resilience Scale with reliability .747, and Inventory of New College Student Adjustments with reliability .701 that have been through the process of trans adaptation. Based on the results of multiple regression tests, self-esteem and resilience are significant predictors of the adjustment of new students in a positive direction. Self-esteem is an evaluation of core self and resilience in difficult times can be a factor that increases the adjustment of new college students.Keywords: Adjustment; New College Student; Resilience; Self-esteem AbstrakSiswa yang melanjutkan pendidikannya ke perguruan tinggi akan menemukan berbagai perubahan, tantangan baru, tuntutan, dan tanggung jawab yang lebih besar. Transisi ini dapat memberikan tekanan bagi mahasiswa baru dan hasil yang negatif apabila tidak dapat melewatinya. Tujuan penelitian ini adalah untuk mengetahui peran self-esteem dan resiliensi terhadap penyesuaian diri mahasiswa baru. Penentuan sampel menggunakan teknik accidental sampling dengan sampel mahasiswa baru di semester pertama yang terdaftar aktif di perguruan tinggi negeri ataupun swasta (N = 673). Alat ukur yang digunakan adalah skala Rosenberg Self-esteem Scale-Revised dengan reliabilitas .836, Brief Resilience Scale dengan reliabilitas .747, dan Inventory of New College Student Adjustment dengan reliabilitas .738 yang telah melalui proses transadaptasi. Berdasarkan hasil uji regresi berganda, self-esteem dan resiliensi merupakan prediktor yang signifikan terhadap penyesuaian diri mahasiswa baru dengan arah yang positif. Self-esteem sebagai evaluasi inti diri dan resiliensi sebagai ketahanan dalam masa sulit dapat menjadi faktor yang meningkatkan penyesuaian diri mahasiswa baru.Kata kunci: Mahasiswa baru; Penyesuaian diri; Resiliensi; Self-esteem
Resiliensi pada mahasiswa di Jakarta: Menilik peran komunitas
Authors: Kinanthi Melok Roro , Grasiaswaty Novika , Tresnawaty Yulistin 
Published: December 2020

AbstractCollege students are prone to depression so that they need to be resilient. The aim of this study is to examine whether community resilience affects resiliency among college students in Jakarta. With a quantitative approach, this study involved 265 participants, selected by convenience sampling. We applied Community Advancing Resilience Toolkit Assessment Survey (CARTAS) and Connor Davidson Resilience Scale (CD-RISC) to gather data on the variables. Reliability coefficients for CARTAS were .656 to .806 for each dimension. While the reliability coefficient for CDRIS was .881. The regression analysis revealed community resilience has a significant positive contribution to individual resilience among participants. For each dimension, the contribution of community resilience to individual resilience was 7,9% to 12,2%. This result implied the community-based approach should be considered to develop an intervention for enhancing individual resilience.Keywords: College student; Community resilience; Resilience. AbstrakPenelitian terdahulu mengungkapkan bagaimana resiliensi memainkan peranan penting bagi mahasiswa agar dapat berdaya dengan maksimal. Penelitian ini bertujuan untuk mengetahui peran resiliensi komunitas terhadap resiliensi mahasiswa di Jakarta. Menggunakan pendekatan kuantitatif, penelitian ini melibatkan 265 partisipan yang dipilih melalui convenience sampling. Instrumen pengumpulan data yang digunakan adalah Community Advancing Resilience Toolkit Assessment Survey (CARTAS) and Connor Davidson Resilience Scale (CDRISC). Koefisien reliabilitas Cronbach Alpha CARTAS berkisar antara 0,656- 0,806 untuk tiap-tiap dimensinya. Sementara itu, koefisien reliabilitas Cronbach Alpha CDRISC adalah 0,881. Analisis regresi menunjukkan resiliensi komunitas berkontribusi positif secara signifikan terhadap resiliensi mahasiswa di Jakarta, dengan kontribusi sebesar 7,9% hingga 12,2%. Temuan ini mengindikasikan pendekatan berbasis masyarakat atau komunitas dapat dipertimbangkan dalam penyusunan intervensi yang dapat meningkatkan resiliensi individu.Kata kunci: Mahasiswa; Resiliensi komunitas; Resiliensi.
Meningkatkan harga diri anak slow learner melalui Child Centered Play Therapy
Authors: Iswinarti Iswinarti , Hormansyah Roselina Dwi 
Published: December 2020

AbstractA slow learner is a child who has a delayed learning process. It affects other abilities such as adaptation, communication, and personality that can affect self-esteem. High self-esteem will make someone able to think positively about themselves and be more confident. One treatment to improve self-esteem is using Child-Centered Play Therapy (CCPT). It helps children to explore themselves through play media. This study aimed to see the effect of CCPT on the improvement of self-esteem in slow learner children. This study designed by using a quasi-experiment with a control group also pre-test and post-test. Subjects were 20 people with 9-11 years age range who were identified as slow learners. There were two groups in this study: experimental groups and the control groups that each contained 10 children. Rosenberg Self-Esteem (RSE) was used as an instrument of self-esteem (?=0,85). The data analysis method used Wilcoxon and Mann-Whitney tests. It proved that Child-Centered Play Therapy (CCPT) was effective in increasing the self-esteem of children who were slow learners. Slow learner children can increase their self-esteem through fun activities. Keyword: Child centered play therapy; Self-esteem; Slow learner AbstrakAnak dengan slow learner adalah seorang anak yang mengalami keterlambatan dalam proses belajar. Keterlambatan ini berpengaruh terhadap kemampuan lainnya seperti adaptasi, komunikasi dan pribadi yang dapat memberi dampak terhadap harga diri. Anak dengan harga diri yang tinggi membuat mereka dapat berpikir positif mengenai dirinya sendiri dan lebih percaya diri. Salah satu bentuk penanganan untuk meningkatkan harga diri adalah menggunakan Child Centered Play Therapy (CCPT). Terapi ini membantu anak mengeksplorasi diri melalui media bermain. Tujuan penelitian ini adalah untuk melihat pengaruh CCPT terhadap peningkatan harga diri anak slow learner. Desain penelitian menggunakan eksperimen quasi dengan kelompok kontrol serta pre-test dan post-test. Terdapat dua kelompok dalam penelitian, yaitu kelompok eksperimen yang terdiri atas 10 anak, dan kelompok kontrol juga terdiri atas 10 anak. Rosenberg Self Esteem (RSE) digunakan sebagai instrumen untuk mengukur harga diri (?=0,85). Teknik analisis data menggunakan uji Wilcoxon dan Mann Whitney. Hasil penelitian menunjukan bahwa Child Centered Play Therapy (CCPT) efektif meningkatkan harga diri anak slow learner. Anak slow learner dapat meningkat harga dirinya melalui terapi yang menyenangkan yaitu melalui bermain. Kata kunci: child centered play therapy; self-esteem; slow learner
Resiliensi akademik dan kepuasan belajar daring di masa pandemi COVID-19: Peran mediasi kesiapan belajar daring
Authors: Kumalasari Dewi , Akmal Sari Zakiah 
Published: December 2020

Abstract The COVID-19 pandemic accelerates the disruption in the education world to shift from face-to-face learning to online learning. Several challenges in implementing online learning potentially make online learning not run well, and later it will be affected by student’s satisfaction. This study aims to examine the effect of academic resilience on student satisfaction in online learning with the mediating role of online learning readiness. About 379 university students (aged 18-32 years (M = 20.55, SD = 1.87) whose hired by using the incidental sampling technique, participated in this study. The data were collected with three instruments: the academic resilience scale (ARS-30), Learner Readiness for Online Learning, and Student Satisfaction with Online Learning. The result showed that online learning readiness fully mediates the relationships between academic resilience and online learning satisfaction. Higher academic resilience increasing online learning readiness, then enhancing student’s online learning satisfaction. This study provides a valuable result for further research and intervention design related to academic resilience, learning readiness, and online learning satisfaction. Keywords: Academic resilience; College students; Online learning readiness; Online learning satisfaction AbstrakPandemi COVID-19 mengakselerasi distrupsi pada dunia pendidikan untuk beralih dari pembelajaran tatap muka menjadi pembelajaran daring. Sejumlah tantangan dalam mengimplementasikan pembelajaran daring berpotensi membuat pembelajaran daring tidak berjalan ideal dan nantinya berdampak pada kepuasan mahasiswa. Penelitian ini bertujuan untuk melihat pengaruh resiliensi akademik terhadap kepuasan mahasiswa dalam pembelajaran daring dengan peran mediasi kesiapan belajar daring. Penelitian ini melibatkan 379 mahasiswa berusia 18-32 tahun (M=20.55, SD=1.87) yang diperoleh melalui Teknik sampling incidental. Pengambilan data dilakukan dengan menggunakan skala the academic resilience scale (ARS-30), Learner Readiness for Online Learning dan Student Satisfaction with Online Learning. Hasil penelitian menunjukkan bahwa kesiapan belajar daring menjadi mediator dalam hubungan antara resiliensi akademik dan kepuasan belajar daring pada mahasiswa. Resiliensi akademik yang baik membuat individu memiliki kesiapan belajar daring yang lebih baik yang kemudian akan meningkatkan kepuasan dalam belajar daring. Hasil penelitian ini dapat menjadi dasar bagi pengembangan penelitian dan intervensi terkait resiliensi akademik, kesiapan belajar dan kepuasan belajar daring. Kata kunci: Kesiapan belajar daring; Kepuasan belajar daring; Resiliensi akademik; Mahasiswa
Accuracy of Prediction of Birth Weight by Fetal Ultrasound
Authors: Acharya Sumnima , Tiwari Awadhesh 
Published: December 2020

Introduction: Fetal weight estimation using ultrasonography (USG) is beneficial for the better feto-maternal outcome. This study was done to determine the accuracy of prediction of birth weight by fetal ultrasound.
Methods: This was a cross-sectional study carried out in the Department of Radio diagnosis, Lumbini Medical College and Teaching Hospital (LMCTH), Palpa, Nepal from1st June to 31st December 2018.Fetal weight was calculated by USG in 325 women using Hadlock’s formula and correlated with birth weight.
Results: Our study showed that fetal ultrasound using Hadlock’s formula has error in estimation of fetal weight by 189gm (SD: 111 gm). In 91.3% of the cases, there was an error of estimation by less than 10% compared to actual weight.
Conclusion: It can be concluded that sonographic estimation of birth weight can be recommended to yield a better prediction of birth weight and to further evaluate fetal well-being.
Study of Anatomical Variations of Nose and Para-nasal Sinuses in Computed Tomography Scan
Authors: Pokhrel Sona , Pandey Bhuwan Raj 
Published: December 2020

Introduction: Computed tomography (CT) has nowadays become the investigation of choice for diagnosis and evaluation of anatomical variations of the nose and paranasal sinuses.
Methods: A cross sectional study was conducted in the Department of Radiology of Lumbini Medical College Hospital from June 2019 to May 2020. Total of 130 patients were enrolled for the study. All patients were subjected to Siemens Somatom scope 16 slice CT scan. Each scan was studied for the presence of agger nasi cell, concha bullosa, deviated nasal septum, haller cell, onodi cell, uncinate process variation and type of olfactory fossa.
Results: The mean age of patients was 36. 86 ±12.06 years. There were 76 males (58.5%) and 54 females (41.5%) with male: female ratio of 1.4:1 with highest range in age group of 31 to 45 years (46.9%). Anatomical variation between male and female was statistically not significant (p>0.05). The most common anatomical variation noted was nasal septal deviation (73.1%), then agger nasi cell (59.3%), concha bullosa (24.6%), paradoxical medial turbinate (7.7%), onodi cell (6.9%), uncinate process variation (5.4%) and least was haller cell (4.6%). Most of the scans had more than one anatomical variation, which was statistically significant (p<0.05). The most common type of olfactory fossa depth was Keros type II (61.5%).
Conclusion: Computed tomography of the paranasal sinus has improved the visualization of anatomical variation hence radiologist must pay close attention to variants.