bluuebunny/crossref_metadata_2025 huggingface dataset:
LITHOLOGY AND HYDRODYNAMICS OF THE BLACK SEA ODESSA COAST UNDERWATER PART
Authors: Pedan G. S. , Kadurin S. V. , Andreeva K. P. , Dragomyretska O. V.
Published: September 2021

Problem Statement and Purpose. The results of lithological studies, including granulometric analysis, are needed to identify the conditions of sedimentation and distribution of rock fragments by size. They are an indicator of the sedimentation processes dynamic structure peculiarities. The study of the sediment regime is important for the development of measures related to the protection of shores from erosion. The aim of the work is to identify the lithological features of the bottom sediment types distribution on the protected section of the Odessa coast near Cape Maly Fontan.
Data & Methods. The materials for this work were obtained in the field research in the summer 2019 in the coastal zone between the hydrobiological station of Odessa I. I. Mechnikov National University, and Cape Malyj Fountain. Three measuring profiles were made perpendicular to the shoreline at 1200 m towards the sea to a depth of 18 m. 35 samples were taken from the upper layer of bottom sediments. Field samples processing was performed in the Problem Research Laboratory of Engineering Geology of the Sea Coast, Reservoirs and Mountain Slopes of Odessa I. I. Mechnikov National University. Granulometric classification was performed. Excel, Statistica, Golden Software Surfer programs were used to process the results.
Results. Underwater relief analysis showed that the coastal part is an abrasive terrace, on which ancient landslides relics are widespread. There are 7 main lithological types of bottom sediments detected. The largest areas covered by fine-grained loamy sands and shell detritus with gravel, pebbles and sand. Analysis of distribution curves and cumulative curves of granulometric distribution showed that coarse sediments are characterized by multi-vertex distribution curves and stepwise stretched cumulative curves, which indicates the heterogeneity of sediments in granulometric distribution. For fine-grained material, which is well sorted, the distribution curves are almost single-vertex, and the cumulative curves have a large steepness and a simple, non-stepped shape.
There are three hydrodynamic detected in bottom sediments lithology according on statistical parameters of grain size. Outer marine part with depth more than 15 meters characterized by low hydrodynamic processes and presented by good-sorted sands and silt. The central part of polygon in 4–15 meters depth covered by shell detritus with gravel and pebble of carbonate rocks and connected with rocky extrusions after coastal landslides. The feature of this part is active hydrodynamic processes. The rocky extrusions presented like natural breakwater and due to waves braking and collection of different types of sediments. The coastal part in 2–4 m depth in front of constructed breakwater leads to decreasing of wave energy and sedimentation of good-sorted sands.
Transformer-based Sarcasm Detection in English and Slovene Language
Authors: Rašl Matic , Žalik Mitja , Keršič Vid
Published: September 2021

Sarcasm detection is an important problem in the field of natural language processing. In this pa-per, we compare performances of the three neural networks for sarcasm detection on English and Slovene datasets. Each network is based on a di˙erent transformer model: RoBERTa, Distil-Bert, and DistilBert – multilingual. In addition to the existing Twitter-based English dataset, we also created the Slovene dataset using the same approach. An F1 score of 0.72 and 0.88 was achieved in the English and Slovene dataset, re-spectively.
Extraction and Analysis of Sport Activity Data Inside Certain Area
Authors: Lukač Luka
Published: September 2021

Nowadays, sport data analysis is one of the cru-cial factors, used to enhance the athletes’ per-formance, which can depend upon many di˙er-ent circumstances. One of those is the area of an exercise, which can dramatically impact on an athlete’s performance. Since not enough devotion has been given to this topic, this study focuses on extracting and analysing parts of exercises, which take place inside of a specific area, using principles from another part of Computer Science, Compu-tational Geometry.
System for Remote Collaborative Embedded Development
Authors: Domajnko Martin , Glavina Nikola , Žel Aljaž
Published: September 2021

This paper explores the challenges and devised solutions for embedded development which arose during the COVID-19 pandemic. While software development, nowadays with modern tools and services such as git, virtual machines and commu-nication suits, is relatively una˙ected by resource location. That is not the case for firmware and embedded systems, which relies on physical hard-ware for design, development, and testing. To overcome the limitations of remote work and ob-structed access to actual hardware, two ideas were implemented and tested. First, based on inte-grated circuit emulation using QEMU to emulate an ARM core and custom software to facilitate communication with the embedded system. Sec-ond, remote programming and debugging over the internet with a dedicated computer system acting as a middle man between a development environ-ment and physical hardware using OpenOCD de-bugger.
Towards Representative Web Performance Measurements with Google Lighthouse
Authors: Heričko Tjaša , Šumak Boštjan , Brdnik Saša
Published: September 2021

Web performance testing with tools such as Google Lighthouse is a common task in software practice and research. However, variability in time-based performance measurement results is observed quickly when using the tool, even if the website has not changed. This can occur due to variability in the network, web, and client devices. In this paper, we investigated how this challenge was addressed in the existing literature. Furthermore, an experiment was conducted, highlighting how unrepresentative measurements can result from single runs; thus, researchers and practitioners are advised to run performance tests multiple times and use an aggregation value. Based on the empirical results, 5 consecutive runs using a median to aggregate results reduce variability greatly, and can be performed in a reasonable time. The study’s findings alert to p otential pitfalls when using single run-based measurement results and serve as guidelines for future use of the tool.
Arnold-Chiari Malformation: Core Concepts
Authors: Fons Kristina , Jnah Amy J.
Published: September 2021

Arnold-Chiari malformation (ACM), a defect that involves downward displacement of the hindbrain and herniation of the cerebellar vermis, tonsils, pons, medulla, and fourth ventricle through the foramen magnum, is the most complex of the 4 types of Chiari malformations. Unique to the other types of Chiari malformations, approximately 95 percent of infants with ACM also present with an associated myelomeningocele (MMC), the most severe form of spina bifida. Among affected infants, those with symptomatic comorbidities incur a significantly higher morbidity and mortality risk. Prompt identification and diagnosis of ACM, as well as evidence-based postnatal and postsurgical nursing and medical care, is critical. Early surgical intervention can repair an existing MMC and restore proper cerebrospinal fluid circulation, which can dramatically improve patient outcomes and quality of life, and reduce disease and health care burden.
Adapting and Testing the Self-Efficacy in Environmental Risk Reduction Instrument Among Spanish-Speaking Populations
Authors: Postma Julie Marie , Oneal Gail , Odom-Maryon Tamara , Barbosa-Leiker Celestina , Marko Tara , Butterfield Patricia
Published: September 2021

Purpose

The purpose of this study was to adapt and test the Self-Efficacy in Environmental Risk Reduction instrument in a Spanish-speaking population.

Methods

Harkness' model of cross-cultural survey design was used to adapt the instrument. We sampled 95 adult, Spanish speakers from a federally qualified health clinic. Exploratory factor analysis with maximum likelihood estimation was used to analyze the factor structure.

Results

A 1-factor model provided the best fit to the data. The latent construct of the instrument is household environmental health self-efficacy. All items loaded higher than 0.610, indicating each item explains at least 36% variance in the latent construct. Cronbach's alpha indicates the scale has high internal consistency (α = .92).

Conclusions

Respondents conceptualize self-Efficacy in Environmental Risk Reduction as practical solutions to minimize household risks.
Psychometric Evaluation of a 10-Item Health Insurance Knowledge Scale
Authors: James Tyler G. , Miller M. David , Nicolette Guy , Cheong JeeWon
Published: September 2021

Background

College students are a priority population for health insurance literacy interventions. Yet, there are few psychometric studies on measuring health insurance knowledge – a core construct of health insurance literacy.

Methods

We administered a health insurance survey to 2,250 college students. We applied Classical Test Theory and Item Response Theory methods to estimate psychometric properties of the Kaiser Family Foundation's 10-item health insurance knowledge quiz.

Results

The scale is unidimensional, and a two-parameter logistic model best fit the data. IRT estimates indicated varying item discriminations (a range: 0.717–2.578) and difficulties (b range: −0.913–1.790). Precision of measurement was maximized for students half a standard deviation below the mean (θ = −0.686) health insurance knowledge ability.

Conclusions

This scale can be used to identify gaps in health insurance knowledge among college students and be applied in clinical and community health education practice.
Psychometric Properties of the Arabic Version of Medication Adherence Self-Efficacy Scale-Revised in Hypertension
Authors: Al-Noumani Huda Salim , Al Omari Omar
Published: September 2021

Background and Purpose

Cultural adaptation of Medication Adherence Self-Efficacy Scale-Revised is lacking in the Arab population. This study tested the psychometric properties of the Arabic version of the Medication Adherence Self-Efficacy Scale-Revised.

Methods

The study included 199 Omani hypertensive patients. The scale was translated into Arabic. Reliability and construct and convergent validity were examined.

Results

Scale’s reliability was α = .93. One factor was identified and explained about 57.5% of the variance. A new modified model with covariance suggested a better model fit. A significant relationship between the scale and Morisky medication adherence scale was found (r = .53, p < .001).

Conclusions

The Arabic version scale is reliable, valid, and could be applied in the clinical settings to improve medication adherence.
Cross-Cultural Adaptation and Psychometrics Evaluation of the Arabic Version of the Patient-Readiness for Hospital Discharge Scale
Authors: Aldughmi Ohoud , Bobay Kathleen L. , Bekhet Abir K. , Sedgewick Gillian , Weiss Marianne E.
Published: September 2021

Background and Purpose

The Patient Readiness for Hospital Discharge Scale (PT-RHDS) is an outcome measure of discharge care processes. The purpose of the study was to test a cross-cultural adaptation from English into Arabic.

Methods

The Rand Corporation cross-cultural adaptation method and psychometric analysis of data from 1844 adult surgical inpatients in two Saudi Arabia hospitals.

Results

Reliability of the Arabic version (α = .75) was adequate. Confirmatory factor analysis supported construct validity. No differences in PT-RHDS scores were detected in comparisons for marital status, sex, age, or length of stay. The Arabic PT-RHDS did not predict readmissions.

Conclusions

The psychometric properties of the Arabic PT- RHDS provide preliminary evidence for its use in assessing surgical patients' perception of readiness for discharge in Arabic-speaking countries.
Psychometric Properties of the Intensive Care Unit Nurses’ Perceptions Questionnaire of Self-Performance With Families of Critically Ill Patients (Persian Version)
Authors: Norouzadeh Reza , Heidari Mohammad Reza , Rahimi Fardin , Kazemnejad Anoshirvan
Published: September 2021

Background and Purpose

Nurses’ self-perception of their performance toward family members of patients is one of the most important issues in predicting family adaptive behaviors. This study analyzed the psychometric properties of the Persian version of intensive care unit (ICU) nurses’ perceptions questionnaire of self-performance with families of critically ill patients.

Methods

Among 135 intensive care nurses, to determine face validity, 10 nurses were asked to comment on, comprehensibility, grammar, and writing of items. Exploratory factor analysis was used to assess construct validity.

Results

The intra-cluster correlation coefficient (ICC) was 0.82 and Cronbach’s alpha was 0.74. Exploratory factor analysis showed the first nine related factors have 65.22% variance.

Conclusion

Persian version of ICU nurses’ perceptions of self-performance with families of critically ill patients had good reliability and validity.
Development and Validation of Questionnaire Measuring Registered Nurses’ Competencies, Beliefs, Facilitators, Barriers, and Implementation of Evidence-Based Practice
Authors: Abuadas Mohammad H. , Albikawi Zainab F. , Abuadas Fuad H.
Published: September 2021

Background

Consideration needs to be given to a variety of factors that influence the implementation of evidence-based nursing practice (EBNP).

Aim

This study aimed to develop and validate a questionnaire that measures registered nurses’ competencies, beliefs, facilitators, barriers, and implementation of EBNP.

Methods

Methodological cross-sectional study in which 612 registered nurses were selected by convenient sampling. A panel of six experts evaluated the content validity of the first draft of the EBP-CBFRI questionnaire. The final questionnaire was made up of 55 items. Reliability was determined by means of internal consistency. Construct, convergent, discriminant, and predictive validity was assessed.

Results

The questionnaire has proven acceptable reliability and validity when used with registered nurses. The scale-level content validity index was .92. Cronbach’s α coefficient for the total questionnaire was .87. Exploratory factor analysis supported five significant factors that explained 64.8% of the variance.
Evaluation of the Caregiver Preparedness Scale in African American and White Caregivers of Persons With Dementia During Post-Hospitalization Transition
Authors: Kuzmik Ashley , Boltz Marie , Resnick Barbara , BeLue Rhonda
Published: September 2021

Background and Purpose

The Preparedness for Caregiving Scale (PCS) is a widely used instrument to measure caregiver preparedness. The purpose was to evaluate the PCS in African American and White caregivers of patients with dementia upon discharge from the hospital.

Methods

Factor structure, measurement invariance, and predictive validity of the PCS were assessed in a sample of 292 family caregivers/patient dyads.

Results

One-factor structure of the PCS and measurement invariance by race was fully supported. Predicative validity revealed significant association between the PCS and anxiety (β = −.41, t = −7.61(287), p < .001), depression (β = −.44, t = −8.39(287), p < .001), and strain (β = −.48, t = −9.29(287), p < .001).

Conclusion

The PCS is a valid and meaningful tool to measure preparedness in African American and White family caregivers of persons with dementia during post-hospitalization transition.
The Development and Testing of a Perinatal Tobacco Attitudes and Behaviors Survey
Authors: Britton Geraldine R. , Collier Rosemary , Rhodes Keefe Joyce M. , Gallagher Wendi F. , Feeney Ann , Sprague Lori M. , James Gary D.
Published: September 2021

Background and Purpose: Accurate assessment of tobacco use in pregnant smokers is key to effective nursing intervention. There is a lack of valid and reliable tools easily integrated into prenatal care. Therefore, the purpose of this study was to develop and test a perinatal survey, guided by the Health Promotion Model (HPM). Methods: The survey was tested with 107 pregnant women via iPad. Urine cotinine assays and a process evaluation were conducted. Results: Reliability yielded a Cronbach’s alpha of .873 for the ever-smoker sample and .835 for the total sample. Factors dovetailed with HPM constructs. Conclusions: Perinatal Tobacco Attitudes and Behaviors Survey (PTABS) exhibits high reliability and validity and is easily utilized. Updates need to include questions on all nicotine products and to be streamlined. With accurate identification of nicotine users nurses can provide targeted interventions early in pregnancy.
Quality and Safety Education for Nurses Student Evaluation Survey: Adaptation and Psychometric Evaluation of the Brazilian Version
Authors: Freitas Juliana S. , Sousa Maiana R. G. , Dolansky Mary A. , Silva Ana Elisa B. C.
Published: September 2021

Background and Purpose: The development of quality and safety competencies is an important issue in nursing education globally. The purpose of this study was to cross-culturally adapt the Quality and Safety Education for Nurses Student Evaluation Survey (QSEN SES) for use in Brazil and evaluate its psychometric properties.Methods: The QSEN SES was adapted into Brazilian Portuguese. Reliability and structural validity were evaluated in an online study with 130 undergraduate nursing students.Results: The content validity index (CVI) of the instrument was 0.93. The reliability was strong. Confirmatory factor analysis was conducted, and the model fit was insufficient.Conclusions: The Brazilian version of QSEN SES is reliable, but additional analyses are needed with a larger sample to confirm the construct validity of the instrument.
Psychometric Features of the Turkish Version of the Cancer Rehabilitation Evaluation System-Short Form for Patients With Cancer
Authors: Güner Perihan , Şar Vedat , Pehlivan Tuğba
Published: September 2021

Background and Purpose: The Cancer Rehabilitation Evaluation System-Short Form (CARES-SF) is one of the first self-report measurement tools that addresses problems and rehabilitation needs of patients with cancer. This study aimed to examine the validity and reliability of the CARES-SF for Turkish-speaking patients with cancer. Methods: The Turkish version of the CARES-SF was administered to 300 patients with colorectal, lung, or breast cancer. Results: While the first six factors of the Turkish CARES-SF covered the same spectrum as the original scale’s subscales, the present study suggests dividing the original psychosocial factors into two subscales: psychological and social (relatives and friends). Conclusions: This preliminary inquiry on the Turkish CARES-SF confirmed the validity and reliability of the original scale except for the shifting of a few items between subsections.
Testing the Psychometric Characteristics of the Revised Mastery of Stress Instrument in Adults With Type 2 Diabetes
Authors: Stamler Lynnette Leeseberg , Hanna Kathleen M. , Kupzyk Kevin A. , DeSouza Cyrus
Published: September 2021

Background and Purpose: A promising, yet lengthy measure to identify mastery of patient-identified stress is Younger’s (1991, 1993) Mastery of Stress Instrument (MSI). With a goal for a parsimonious and valid measure, this study determined the psychometric properties of a reduced item instrument with adults diagnosed with type 2 diabetes. Methods: First, an expert content analysis was completed. Second, item and confirmatory factor analysis were completed with a sample of 200 adults with a diagnosis of type 2 diabetes. Results: Eight items were removed through content validity and seven items were removed with Item analysis. Factor analysis supported Younger’s four sub-concepts. Conclusions: Future research with this revised MSI scale is advocated to identify those who may need strategies to increase their mastery of stress.
Instrument Development and Psychometric Validation Using Confirmatory Factor Analysis of the Breastfeeding Relationship Scale
Authors: Wood Natsuko K. , Barbosa-Leiker Celesina , Odom-Maryon Tamara , Kantrowitz-Gordon Ira , Reifsnider Elizabeth , Helfrich-Miller Kathleen R.
Published: September 2021

Background and Purpose: The Breastfeeding Relationship Scale (BFRS) was developed to measure mother–infant mutual responsiveness during breastfeeding. The purpose of this study was to develop and test the psychometric properties of the BFRS. Methods: Construct validity of a 16-item three-factor model (Mother–Infant Breastfeeding Interaction, Perceived Adequate Milk Supply, and Breastfeeding Synchronicity) was assessed using confirmatory factor analysis (CFA) and reliability (Cronbach’s alpha) across two independent samples. Results: CFA of the hypothesized three-factor model demonstrated good fit in both samples (comparative fit index >.90, root mean square error of approximation <.06, square root mean residual < .061). Cronbach’s alpha for the constructs ranged between .73 and .83. Conclusion: The BFRS is a valid measure of breastfeeding relations between mother and infant. Reliability was acceptable for all constructs in both samples.
The Turkish Adaptation of the Diabetes Fatalism Scale: A Validity and Reliability Study
Authors: Serin Emine Kaplan , Saritas Seyhan Citlik
Published: September 2021

Background and Objective:This study was carried out as a validity and reliability study of the Turkish version of the Diabetes Fatalism Scale (DFS) and to investigate its psychometric properties in the Turkish society with type 2 diabetes patients.Methods:Exploratory factor analysis was conducted to assess the scale’s factor structure. Confirmatory factor analysis (CFA) was performed to validate the “best fit” model.Results:The explanatory factor analysis and CFA results confirmed the three-factor structure of the scale. The Cronbach’s α, item-total correlation and test–retest analyses showed high reliability.Conclusion:The results showed that DFS is a valid and reliable tool for evaluating fatalism in diabetic patients from a Turkish population.
Prenatal Motivation for Caregiving Issues: A Pilot Study of Mothers Expecting Healthy Infants and Infants With Complex Congenital Heart Disease
Authors: Pridham Karen , McKechnie Anne Chevalier , Harrison Tondi M. , Brown Roger
Published: September 2021

Background and Purpose

The prenatal preparing women do for infant caregiving is understudied. In this pilot, multimethods study, we examined motivation for preparing for infant caregiving of women in their third trimester of pregnancy expecting either a healthy infant or an infant with complex congenital heart disease (CCHD).

Methods

Eleven women expecting a healthy infant and four expecting an infant with CCHD completed a questionnaire and were interviewed. Preparing was reported in context of expectations, intentions, and goals and in personal, family, and infant conditions. Motivation for preparing was expressed through an interview about caregiving issues women were working on. Intensity of motivation was estimated by self-report of the time infant caregiving issues were in thought or action. Effect sizes were calculated for between group differences in motivation intensity. Interview data were examined with directed content analysis.

Results

Intensity of motivation was higher for women expecting an infant with CCHD for issues of Knowing What and How to prepare. Women expecting an infant with CCHD reported uncertainty about how they would feed their babies given their health condition. Interviews yielded new motivations encompassing issues of family and working with the parent partner.

Implications

Assessment of issues women are working on prenatally, indicating motivations for preparing for infant caregiving, and of the intensity of motivations advances culturally-attuned and family-centered preparation. Knowledge of these issues and motivation intensity could orient clinical care to supporting women in developing well-informed expectations, intentions, and goals culturally suited to postnatal learning and infant needs.
Joining experience between Agrotechnical Schools and the Faculty of Veterinary Sciences of UNLPam
Authors:   Universidad Nacional de La Pampa, Facultad de Ciencias Veterinarias, Gómez María Bettina ,   Argentina, Castillo Melina ,   Universidad Nacional de La Pampa, Facultad de Ciencias Veterinarias; Argentina, Cerutti Dante Alberto ,   Universidad Nacional de La Pampa, Facultad de Ciencias Veterinarias; Argentina, Palermo Pedro Vicente ,   Universidad Nacional de La Pampa, Facultad de Ciencias Veterinarias; Argentina
Published: September 2021

Este trabajo resulta de la implementación de la pra-xis, reflexión y acción de manera participativa, entre estudiantes y docentes de los últimos años de escue-las agrotécnicas, junto a estudiantes y docentes in-vestigadores de la Facultad de Ciencias Veterinarias, a través del estudio de las propiedades emergentes de una población ovina. Se desarrolló en función de la vinculación de todos los actores,a partir de una situación problema, que promovió un pensamiento crítico y colaborativo y, al mismo tiempo, fomentó la adquisición de habilidades para intervenir en si-tuaciones productivas reales de su comunidad. La extensión universitaria expande experiencias lle-vándolas a terreno y permite un enriquecimiento del aprendizaje. Para los integrantes del ámbito uni-versitario la formación continua significa también exponerse a la realidad de su disciplina, más allá del aula y construir conocimientos con una parte de la sociedad, entendiendo que a través de la enseñanza también es posible aprender.
Analysis of operating parameters of the aircraft piston engine in real operating conditions
Authors: Czarnigowski Jacek Andrzej , Rękas Daniel , Ścisłowski Karol , Trendak Michał , Skiba Krzysztof
Published: September 2021

The article presents the results of analysis of operational parameters of piston engine CA 912 ULT which is a propulsion system of ultralight gyroplane Tercel produced by Aviation Artur Trendak. Research was conducted under normal operating conditions of the autogyro and data was collected from 20 independent tests including a total of 28 flight hours, divided into training flights and competition flights.Engine speed, manifold air pressure and temperature, fuel pressure, injection time, and head temperature were recorded at 9 Hz during each flight. Collective results were presented to show the statistical analyses of the individual parameters by determining the mean values, standard deviations and histograms of the distribution of these parameters. Histograms of operating points defined by both engine speed and manifold air pressure were also determined. Analyses of the engine dynamics as a distribution of the rate of change of the engine rotational speed were also carried out. It was shown that the engine operating points are concentrated mainly in the range of idle and power above 50% of nominal power. The most frequent range is 70-80% of nominal power. It was also shown that the dynamics of engine work in real operating conditions is small. It was also shown that the way of use significantly influences the distribution of operating points. During training flights, an increase in the number of take-offs and landings causes an increase in the amount of engine work at take-off and nominal power and at idle.
Comparison of work volumes on maintenance of tram track sections on various stages of life cycle
Authors:   Siberian Transport University (STU), Fedosov A. D. , Antereykin E. S. ,   Siberian Transport University (STU)
Published: September 2021

The paper presents the assessment of technical condition of track on the example of two tram sections on Titov and Svyazistov streets in Novosibirsk. The authors have compared sections by the number of derailments and have revealed the main reasons of the derailments. As a result, they have established the volumes of maintenance of tram tracks and the required labour costs, as well as the works that make the main share of labour costs for 5 years on both considered sections. In order to control the track position for the provision of comfortable and safe transportation of passengers the authors recommend to use a track measuring truck.
Increase of elasticity of catenary suspension by application of method based on individual calculation of cantilevers
Authors:   Ural state university of railway transport (USURT), Kovalev A. A. , Glazov D. V. ,   Ural state university of railway transport (USURT), Ivanishhev A. Yu. ,   Ural state university of railway transport (USURT)
Published: September 2021

The paper studies problems of increasing the quality of current collection. To solve problems the authors propose to use a method of automated design of catenary cantilevers, which will increase the elasticity of catenary suspension. The authors have analysed failures of catenary devices and have discussed methods of selection and design of catenary cantilevers, their advantages and disadvantages.
Approaches to assessing the impact of transformation of professional competencies of the staff on the energy efficiency of railway transport enterprises
Authors:   Omsk State University of Railway Transport, Komyakov A. A. , Legchilina E. Yu. ,   Omsk State University of Railway Transport, Tkachenko Zh. V. ,   Omsk State University of Railway Transport, Chulembayev A. M. ,   Omsk State University of Railway Transport
Published: September 2021

The article deals with the impact of transformation of professional competencies on energy efficiency of the structural divisions of railway transport. The analysis of existing trends in the development of professional competencies in the field of energy saving and energy efficiency improvement in the context of active digital transformation is carried out, as a result of which the authors focus on additional professional education. Approaches to the quantitative and qualitative assessment of the impact of competence transformation on energy efficiency are considered, including historical and external benchmarking, as well as cluster analysis, and their advantages and disadvantages are described. An enlarged algorithm for evaluating the energy efficiency of enterprises is formed, taking into account the transformation of competencies. As initial data, the authors consider the energy efficiency indicators of structural divisions in relation to production and climate factors and the results of a survey of specialists. It is concluded that it is necessary to apply a comprehensive approach to assessing the transformation of competencies, which will effectively solve management tasks in this area, depending on the specifics of economic activity of a structural unit, the relative level of its energy intensity and other technological and socio-economic conditions.
Intergenerational care in corona times: Practices of care in Swedish families during the pandemic
Authors: Eldén Sara , Anving Terese , Alenius Wallin Linn
Published: September 2021

Objective: This paper analyses intergenerational relationships in Sweden during the corona pandemic, with a special focus on practices of care. The research question is: How is care between generations – between grandparents, adult children and grandchildren – done during pandemic conditions?

Background: In Sweden, where an extensive welfare state provides affordable child- and eldercare, the corona strategy of generational separation has still affected family practices of care between generations. In this article we analyse narratives of intergenerational care, taking our point of departure in theories of personal life (Smart 2007), relationality (Mason 2004), and care as sentient activity (Mason 1996).

Method: The paper draws on a qualitative interview study with grandparents (n=30), adult children (n=12) and grandchildren (n=12), with data collection taking place shortly before and during the coronavirus pandemic.

Results: The study detects the reciprocal and complex ways in which care between generations takes place. When people relate their experiences, strategies for new ways of doing care are at the centre, involving creative ways of negotiating distance and risk, all marked by both worry and relief.

Conclusion: The pandemic condition becomes a "filter" affecting and leading to a reformulation of practices of care, from taken-for-granted co-presence narratives, into narratives of relational participation resulting in an overall heightened awareness of the importance and difficulties of intergenerational care practices. The study concludes that a strong welfare state does not translate into complete autonomy or independence; rather, people continue to live "linked lives".
Prevalensi Fascioliasis pada Kerbau di Kabupaten Agam, Sumatra Barat, Indonesia
Authors: Ridwan Muhammad , Suwanti Lucia Tri , Suprayogi Tri Wahyu , Mufasirin Mufasirin , Kusnoto Kusnoto , Hastutiek Poedji
Published: September 2021

Salah satu permasalahan yang sering dihadapi para peternak kerbau adalah penyakit Fascioliasis yang disebabkan oleh cacing hati atau Fasciola spp., dimana penyakit tersebut adalah salah satu penyakit yang bersifat zoonosis. Oleh sebab itu penelitian ini bertujuan untuk mengetahui prevalensi Fasciola spp. pada kerbau di Kabupaten Agam, Sumatra Barat. Sampel berupa feses 105 ekor kerbau dari tiga kecamatan lalu diperiksa dengan menggunakan metode natif (sederhana) dan sedimentasi sederhana. Hasil penelitian diperoleh 25 ekor dari 105 ekor kerbau dinyatakan positif terinfeksi Fasciola spp. Prevalensi yang diperoleh secara keseluruhan adalah 23,81% (25/105), dan hasil ini dapat dikembangkan dalam penelitian lebih lanjut.
Identifikasi Salmonella sp. pada Susu Segar di Peternakan Sapi Perah Kecamatan Licin Kabupaten Banyuwangi
Authors: Satria Rafif Galih , Hamid Iwan Sahrial , Wibawati Prima Ayu , Estoepangestie Agnes Theresia Soelih , Saputro Amung Logam , Praja Ratih Novita
Published: September 2021

Tujuan dari penelitian ini adalah untuk mengetahui tingkat cemaran bakteri Salmonella sp. pada susu segar dari peternakan sapi perah di kecamatan licin kabupaten banyuwangi. Sampel susu segar di ambil pada april 2021 sebanyak 16 sampel dari KPSP Ijen makmur di kecamatan Licin Kabupaten Banyuwangi. Sampel diambil sebanyak 25 ml dari masing-masing peternak. Hasil yang di dapat setelah melakukan isolasi dan identifikasi menggunakan media Salmonella Shigella Agar (SSA), dan dilanjutkan uji identifikasi menggunakan TSIA dan Urea didapatkan  dari ke 16 sampel semua dinyatakn negatif bakteri Salmonella sp.. Hal ini dapat terjadi karena para peternak sapi perah di Kecamatan licin sudah mulai menyadari pentingnya kebersihan kandang dan sanitasi kandang yang baik sehingga tingkat cemaran bakteri Salmonella sp. dapat dicegah.
Investigation of granulometric, chemical and phase compositions of hot‑dip galvanizing wastes
Authors: Urbanovich N. I. , Baranovsky K. E. , Rozenberg E. V. , Dashkevich V. G. , Lugin V. G.
Published: September 2021

The article presents the waste generated during the production of hot‑dip galvanizing. The results of the study of the particle size distribution of zinc dust showed that its particle size distribution in the size range of particles ≤ 250 μm, the proportion of which is 87 wt.%, corresponds to the fractional composition of standard powder zinc. In ash, the number of particles up to 250 microns in size is approximately 35 wt.%. Studies of the chemical and phase composition of the hot‑dip galvanized waste – zinc dust made it possible to establish that the zinc content of the waste approximately corresponds to powder zinc (GOST 12601). The proportion of pure zinc in dust is 95 %. Chemical and phase analyzes of the ash have shown that it contains zinc oxides, pure zinc and zinc chlorides. Zinc chlorides, in turn, can be a supplier of chlorine ions in thermal diffusion galvanizing. In this regard, it is of interest to use ash in the composition of the powder composition as an activating and zinc‑containing component. The results of the analysis of the conducted studies of hot‑dip galvanizing wastes – zinc dust and soot show that they are promising for their use as components in saturating mixtures in the production of zinc coatings by chemical‑thermal treatment. This will reduce the cost of galvanized products and ensure the recycling of zinc into industrial circulation.
Timely diagnostics of hydraulic equipment in metallurgical production
Authors: Gapeenko E. V.
Published: September 2021

Precision control of hydraulic equipment is a distinctive feature of modern hydraulic systems. With the help of special diagnostic devices, it is possible to reliably and simply monitor the operation of hydraulic equipment. Diagnostic methods can be very different. The article lists the stages and methods of checking hydraulic equipment malfunctions, as well as describes the principles of operation of diagnostic devices of well‑known world manufacturers HYDAC, MOOG, used in OJSC “BSW – Management Company of the Holding “BMC”. Schematically, the connection of the MOOG tester to the production equipment is presented when checking the servo valve in autonomous and combined mode, without resorting to dismantling the valve. Continuous monitoring of the oil purity with the help of the HYDAC FCU device allowed saving time on assessing its condition and taking fast‑acting corrective measures to clean the oil from contamination.
Investigation of the effect of vacuum on the curing of mixtures on a silicate binder
Authors: Rusevich O. A. , Rovin S. L.
Published: September 2021

The article presents the results of a study of the effect of vacuuming on the curing processes of liquid‑glass mixtures. The method of conducting experiments using an original laboratory vacuum installation and the mechanisms of curing a liquid‑glass mixture with various hardening methods are described. Studies have shown that vacuuming can signifi antly accelerate the curing and increase the strength of the mixture while reducing the content of the silicate binder. This; in turn; facilitates the knockability of liquid‑glass mixtures and expands the prospects for using these environmental friendly mixtures in foundry as an alternative to sands based on organic binders.
Depresión, ansiedad y estrés por COVID -19 en actores educativos
Authors: Aldana Zavala Julio Juvenal , Isea-Argüelles Josía Jeseff , Colina-Ysea Félix José
Published: September 2021

La investigación tuvo por objetivo analizar la presencia de depresión, ansiedad y estrés en actores educativos durante el periodo de cuarentena por COVID-19. Se sustentó desde el enfoque cuantitativo con un tipo descriptivo con diseño no experimental, basado en la visión epistémica sujeto – objeto. La población estuvo conformada por actores educativos (docentes y estudiantes), quienes cumplieron con los criterios de inclusión, se les aplicó el instrumento DASS-21 con la finalidad de recopilar datos que fueron procesados estadísticamente. Se confirma la presencia de depresión, ansiedad y estrés en la muestra poblacional, aunque no puede declararse que tengan su origen a causa de la pandemia por COVID-19, sino profundización motivado al estado de incertidumbre y alarma social generado, así como por el empleo de la modalidad virtual para la cual al inicio del periodo académico no se tenía prevista su implementación.
Experimental Study of Natural Ions and Rock Interactions for Seawater Breakthrough Percentage Monitoring during Offshore Seawater Flooding
Authors: Wang Yanqing , Li Xiang , Lu Jun
Published: September 2021

Seawater breakthrough percentage monitoring is critical for offshore oil reservoirs because seawater fraction is an important parameter for estimating the severity of many flow assurance issues caused by seawater injection and further developing effective strategies to mitigate the impact of those issues on production. The validation of using natural ions as a tracer to calculate the seawater fraction was investigated systematically by studying the natural chemical composition evolution in porous media using coreflood tests and static bottle tests. The applicable range of ions was discussed based on the interaction between ion and rock. The barium sulfate reactive model was improved by integrating interaction between ions and rock as well as fluid flow effect. The results indicate that chloride and sodium interact with rock, but the influence of the interaction can be minimized to a negligible level because of the high concentrations of chloride and sodium. Thus, chloride and sodium can be used as conservative tracers during the seawater flooding process. However, adsorption/desorption may have a large influence on chloride and sodium concentrations under the scenario that both injection water and formation water have low chloride and sodium content. Bromide shows negligible interaction with rock even at low concentrations and can be regarded as being conservative. The application of a barium and sulfate reaction model in coreflood tests does not work as well as in bottle tests because fluid flow in porous media and ion interaction with rock is not taken into account. Although sulfate and barium adsorption on clay is small, it should not be neglected. The barium sulfate reaction model was improved based on the simulation of ion transport in porous media. Cations (magnesium, calcium, and potassium) are involved in the complicated cation-exchange process, which causes large deviation. Therefore, magnesium, calcium, and potassium are not recommended to calculate seawater fraction. Boron, which exists as anions in formation water and is used as a conservative tracer, has significant interactions with core matrix, and using boron in an ion tracking method directly can significantly underestimate the seawater fraction. The results give guidelines on selecting suitable ions as tracers to determine seawater breakthrough percentages under different production scenarios.
Use of Fiber-Optic Information To Detect and Investigate the Gas-in-Riser Phenomenon
Authors: Santos Otto L. A. , Williams Wesley C. , Sharma Jyotsna , Almeida Mauricio A. , Kunju Mahendra K. , Taylor Charles E.
Published: September 2021

A potential application of optical fiber technologies in the well control domain is to detect the presence of gas and to unfold the gas dynamics inside marine risers (gas-in-riser). Detecting and monitoring gas-in-riser has become more relevant now when considering the application of managed pressure drilling operations in deep and ultradeep waters that may allow for a controlled amount of gas inside the riser. This application of distributed fiber-optic sensing (DFOS) is currently being evaluated at Louisiana State University (LSU) as part of a gas-in-riser research project granted by the National Academies of Sciences, the Gulf Research Program (GRP).

Thus, the main objective of this paper is to present and discuss the use of DFOS and downhole pressure sensors to detect and track the gas position inside a full-scale test well during experimental runs conducted at LSU. The other objectives of this work are to show experimental findings of gas migration in the closed test well and to present the adequacy of a mathematical model experimentally validated to match the data obtained in the experimental trials.

As a part of this research effort, an existing test well at the LSU Petroleum Engineering Research and Technology Transfer Laboratory (PERTT Lab) was recompleted and instrumented with fiber-optic sensors to continuously collect data along the wellbore and with four pressure and temperature downhole gauges to record those parameters at four discrete depths. A 2⅞-in. tubing string, with its lower end at a depth of 5,026 ft, and a chemical line to inject nitrogen at the bottom of the hole were also installed in the well.

Seven experimental runs were performed in this full-scale apparatus using fresh water and nitrogen to calibrate the installed pieces of equipment, to train the crew of researchers to run the tests, to check experimental repeatability, and to obtain experimental results under very controlled conditions because water and nitrogen have well-defined and constant properties. In five runs, the injected gas was circulated out of the well, whereas in two others, the gas was left inside the closed test well to migrate without circulation. This paper presents and discusses the results of four selected runs.

The experimental runs showed that fiber-optic information can be used to detect and track the gas position and consequently its velocity inside the marine riser. The fiber-optic data presented a very good agreement with those measured by the four downhole pressure gauges, particularly the gas velocity. The gas migration experiments produced very interesting results. With respect to the mathematical model based on the unsteady-state flow of a two-phase mixture, the simulated results produced a remarkable agreement with the fiber-optic, surface acquisition system and the downhole pressure sensors data gathered from the experimental runs.
SARA-Based Correlation To Describe the Effect of Polar/Nonpolar Interaction, Salinity, and Temperature for Interfacial Tension of Low-Asphaltene Crude Oils Characteristic of Unconventional Shale Reservoirs
Authors: Saputra I. W. R. , Schechter D. S.
Published: September 2021

Oil/water interfacial tension (IFT) is an important parameter in petroleum engineering, especially for enhanced-oil-recovery (EOR) techniques. Surfactant and low-salinity EOR target IFT reduction to improve oil recovery. IFT values can be determined by empirical correlation, but widely used thermodynamic-based correlations do not account for the surface-activities characteristic of the polar/nonpolar interactions caused by naturally existing components in the crude oil. In addition, most crude oils included in these correlations come from conventional reservoirs, which are often dissimilar to the low-asphaltene crude oils produced from shale reservoirs. This study presents a novel oil-composition-based IFT correlation that can be applied to shale-crude-oil samples. The correlation is dependent on the saturates/aromatics/resins/asphaltenes (SARA) analysis of the oil samples. We show that the crude oil produced from most unconventional reservoirs contains little to no asphaltic material. In addition, a more thorough investigation of the effect of oil components, salinity, temperature, and their interactions on the oil/water IFT is provided and explained using the mutual polarity/solubility concept. Fifteen crude-oil samples from prominent US shale plays (i.e., Eagle Ford, Middle Bakken, and Wolfcamp) are included in this study. IFT was measured in systems with salinity from 0 to 24% and temperatures up to 195°F.