bluuebunny/crossref_metadata_2025_split huggingface dataset:
Putting Theory into Practice: Incorporating a Community Engagement Model into Online Pre-professional Courses in Legal Studies and Human Resources Management
Authors: France-Harris, J.D. Antoinette , Burton, Ed. D. Christie H. , Mooney, J.D. Mara 
Published: June 2019

As part of community-engaged educational partnerships, students are paired with community members in instructor-focused activities linked to an academic curriculum. Scholars widely agree that this type of approach can significantly improve the learning experience for students while simultaneously having a positive impact on the community. As faculty in higher education implement this pedagogical tool, it is a natural progression for it to expand into online classrooms. In particular, while there is a growing body of research related to community engagement in online healthcare and science-related fields, less research exists on the incorporation of community engagement in other types of online pre-professional courses. This paper explores student perceptions in online pre-professional undergraduate courses in the legal studies and human resources fields in which community engagement projects were utilized. These experiences should lead to a deeper understanding of the benefits and challenges of community-engaged online classrooms and give guidance for developing future projects.
A structural equation model of predictors of online learners’ engagement and satisfaction
Authors: Kucuk Sevda , Richardson Jennifer C 
Published: June 2019

This study investigated the structural relationships among online learners’ teaching, social and cognitive presence, engagement, and satisfaction. Data were collected from graduate students enrolled in an online graduate program at a large Midwestern public university through online surveys. Structural equation modeling (SEM) was used to analyze the data. According to the results, teaching presence, cognitive presence, emotional engagement, behavioral engagement, and cognitive engagement were significant predictors of satisfaction and these determinants explained 88% of the variance in satisfaction. The results indicate that the dominant determinant of the satisfaction was teaching presence, which had direct and indirect effects on satisfaction. Moreover, the study revealed significant predictors of emotional, behavioral, cognitive and agentic engagement. Implications are discussed in terms of theoretical insights, practices for online learning environments, and further research directions.
Learner Engagement in Blended Learning Environments: A Conceptual Framework
Authors: Halverson Lisa R. , Graham Charles R. 
Published: June 2019

Learner engagement correlates with important educational outcomes, including academic achievement and satisfaction. Although research is already exploring learner engagement in blended contexts, no theoretical framework guides inquiry or practice, and little consistency or specificity exists in engagement definitions and operationalizations. Developing definitions, models, and measures of the factors that indicate learner engagement is important to establishing whether changes in instructional methods (facilitators) result in improved engagement (measured via indicators). This article reviews the existing literature on learner engagement and identifies constructs most relevant to learning in general and blended learning in particular. We present a possible conceptual framework for engagement that includes cognitive and emotional indicators, offering examples of research measuring these engagement indicators in technology-mediated learning contexts. Finally, we suggest future studies to test the framework, which we believe can support advances in blended learning engagement research that is increasingly real-time, minimally intrusive, and maximally generalizable across subject matter contexts.
Promoting a Sense of Belonging in Online Learning Communities of Inquiry
Authors: Peacock Susi , Cowan John 
Published: June 2019

A sense of belonging (SoB) is a valued concept in campus-based learning, being firmly linked with improved student attainment, increased learners’ satisfaction and reduced attrition rates. Some researchers even assert that learners are unable to fulfil the goals of higher education without acquiring a SoB. This article recognises that SoB can help promote and consolidate learning and seeks to specify how tutors may nurture online learners’ SoB. An adapted version of the Community Inquiry Framework (CoIF) is used to frame specific suggestions for action. This revision of the well-known Framework focuses upon the overlapping intersections of the three Presences, entitled Influences: ‘Trusting’, ‘Meaning-making’ and ‘Deepening understanding’. For each Influence, guidance illustrated by examples is offered, leading to particular suggestions that concentrate upon the promotion of a sense of belonging as an important aspect of the online tutor’s facilitative activities.
Student engagement as predictor of xMOOC completion: An analysis from five courses on energy sustainability
Authors: Guajardo Leal Brenda Edith , Valenzuela González Jaime Ricardo , Scott John 
Published: June 2019

MOOC are characterized as being courses to which a large number of students enroll, but only a small fraction completes them. An understanding of students' engagement construct is essential to minimize dropout rates. This research is of a quantitative design and exploratory in nature, and investigates the interaction between contextual factors (demographic characteristics), student engagement types (academic, behavioral, cognitive and affective), and learning outcomes, with the objective of identifying the factors that are associated with completion of massive and open online courses. Two logistic models were adjusted in two samples, general and secondary, with the binary dependent variable defined as completes the course yes/no. The results in the general sample (15% completion rate) showed that the probabilities of a participant completing the course are positively and significantly related to participation in the forum and the participant educational level, and negatively related to gender (female) and age. The results in the secondary sample (87% completion rate) showed that the probabilities of a participant completing the course are positively and significantly related to participation in the forum, gender (female), and the motivation and satisfaction indexes, and negatively related to age, having previous experience in other MOOC, and self-efficacy and task strategies indexes. The results lead to ideas on how these variables can be used to support students to persist in these learning environments.
Non-Surgical Correction of Nasal Dorsum and Tip in Primary Cases
Authors: Yordanov Y. P. , Shef A. 
Published: June 2019

Abstract
Nowadays, minimally invasive and non-invasive approaches in aesthetic medicine are increasingly popular and non-surgical rhinoplasty is one of the procedures with rising demand worldwide. In Bulgaria, this procedure seems to be uncommonly performed, since there are no reports in the local scientific literature. The aim of this preliminary study was to briefly explore the possibilities of hyaluronic acid (HA) fillers for correcting three of the most common nasal deformities – dorsal hump, under-projected and under-rotated nasal tip in primary cases. In order to accomplish this objective, a retrospective clinical study was conducted encompassing 11 cases of the authors’ practices with the above mentioned nasal irregularities and no previous surgical/non-surgical treatment. The analysis of patient-reported outcomes suggested a high satisfaction rate, with no major complication in the series. The HA filler has shown to be safe, relatively easily applicable and highly effective for camouflaging nasal deformities. A special emphasis was put on the patient safety and ten golden rules for staying out of trouble were given.
Antisickling Effects of Quercetin may be Associated with Modulation of Deoxyhaemoglobin, 2, 3-bisphosphoglycerate mutase, Redox Homeostasis and Alteration of Functional Chemistry in Human Sickle Erythrocytes.
Authors: Muhammad Aliyu , Waziri Aliyu Dahiru , Forcados Gilead Ebiegberi , Sanusi Babangida , Sani Hadiza , Malami Ibrahim , Abubakar Ibrahim Babangida , Abbah Musa Fatima , Nelson Ali Tony , Musa Bashir , Mohammed Hafsat Abdullahi 
Published: June 2019

Abstract
It is now glaring that sickle cell anaemia is still one of the highest leading inbred hemoglobinopathy amongst Africans. This study examined the antisickling effects of quercetin via modulation of deoxy-haemoglobin, redox homeostasis and alteration of functional chemistry in human sickle erythrocyte using in silico and in vitro models while espousing preventive and curative approaches. Quercetin was docked against deoxy-haemoglobin and 2, 3-bisphosphoglycerate mutase, with binding energies (−30.427 and −21.106 kcal/mol) and Ki of 0.988μM and 0.992μM at their catalytic sites via strong hydrophobic and hydrogen bond interactions. Induction of sickling was done using 2% metabisulphite at 3h. Treatment with quercetin prevented sickling outstandingly at 5.0μg/mL and reversed same at 7.5μg/mL, 83.6% and 75.9%, respectively. Quercetin also significantly (P<0.05) maintained the integrity of erythrocyte membrane apparently from the observed % haemolysis relative to untreated. Quercetin significantly (P<0.05) prevented and counteracted lipid peroxidation while stimulating GSH and CAT levels which were detected to considerably (P<0.05) increase with simultaneous significant (P<0.05) reduction in SOD level based on curative approach. Umpiring from our FTIR results, a favorable alteration in the part of functional chemistry in terms of shifts (bend and stretches) and functional groups were observed relative to the induced erythrocyte/untreated. Thus, antisickling effects of quercetin may be associated with modulation of deoxy-haemoglobin, redox homeostasis and alteration of functional chemistry in human sickle erythrocytes.
Influence of Tensile Stress on Woven Compression Bandage Structure and Porosity
Authors: Aboalasaad Abdelhamid R.R. , Sirková Brigita Kolčavová , Ahmad Zuhaib 
Published: June 2019

AbstractWoven compression bandage (CB) is one of the elastic textiles that exert pressure on muscles. With a defined tensile strength, it is possible to create the required compression on the given body parts. This work aims to investigate the relationship between woven fabric deformation, porosity, and tensile stress properties of three main types of woven CBs. All bandage samples are applied on human leg using two- and three-layer bandaging techniques. Bandage porosity is calculated for all frames at different weave angles using NIS software. Woven bandage construction parameters which are given by the preparation of warp and weft yarns, twist, count, and density along with woven fabric weave, type of weaving, and finishing process are the main factors that influence the bandage properties. Several methods considering thread distributions have been developed to determine the woven fabric's porosity during the tensile stress. Experimental results confirm that bandage porosity is directly proportional to the bandage extension and weave angle that ranges from 44° to 90°. The novelty of candidate study is to introduce practical remarks to the patient for optimizing the required bandage pressure by suitable extension or applied tension or weave angle for two- and three-layer bandaging systems.
Freezing of the Subballast Layers of the Railway Formation – High Embankment and Double Track
Authors: Hodás Stanislav , Pultznerová Alžbeta 
Published: June 2019

Abstract
In the paper, a numerical modelling experiment is presented in order to detect the temperature transition through the individual layers of the railway formation during the winter period that is their undesirable freezing. In the experiment, the temperature behaviour and the zero isotherm (0 °C) are investigated. We want to prove that the temperatures are also affected by the volume of mass in the railway formation. The modelling of new experiment has been carried out done on a low and also high embankment of single and double track railway, where the volume of material in the core of the formation is almost doubled. The experiment demonstrated that the greater is the mass of the subballast layers, the higher is the resistance to freezing due to the accumulated heat in the pre-winter period.
HVAC Systems Heat Recovery with Multi-Layered Oscillating Heat Pipes
Authors: Kabát Juraj , Gužela Štefan , Peciar Peter 
Published: June 2019

Abstract
The aim of this work is to investigate a heat performance of a Multi-Layered Oscillating Heat Pipes Heat Exchanger (ML-OHPHE) for the application of heat recovery in heating, ventilation and air conditioning systems (HVAC systems). The heat exchanger is investigated experimentally under different conditions of heat loads and filling ratios. The experimental data results are compared to the data obtained from Honeywell’s UniSim® Design Suite software. In the end the NTU analysis of the ML-OHPHE is done and a value of overall heat transfer coefficient is calculated. The results of the experiments indicate that the ML-OHPHE could serve as a completely passive heat transfer device in the application of heat recovery in HVAC systems.
Posturographic Tests of Candidates for Military Pilots
Authors: Masłowski Wiesław , Opara Tadeusz , Burek Michał 
Published: June 2019

Abstract
One of the many elements of the process of qualifying the candidates for military aircraft pilots is the assessment of the correct functioning of their body balance system, responsible, inter alia, for spatial orientation during a flight. That system continuously controls the spatial position of the center of body mass. To measure that value directly is a complex metrological task. That is why an equivalent measure is used in tests of standing posture stability, i.e. the position of a projection of the center of mass on a supporting plane.
Quantitative information determining the characteristics of the body balance system may be obtained in posturographic tests, which include measurement, recording and assessment of the trajectory of a projection of the examined person’s center of body mass.
At the preliminary stage, examined were nineteen candidates for fighter pilots (one woman and 18 men), students of the Polish Air Force Academy in Dęblin.
Based on the conducted measurements of the body mass center position and the stabilographic tests, the correctness of their balance system performance was assessed. The article discusses the examination methodology, presents measurement results and conclusions.
Eddy-Current Sensor for a Tachometer
Authors: Pieniążek Jacek , Ryba Paulina 
Published: June 2019

Abstract
The speed of a rotor or rotors of a turbine engine is important information on its operation. Due to the specific conditions, in which the measurement is taken in a turbine engine, which in particular applies to small engines that are becoming increasingly popular in manned and unmanned aviation, the most universal detector is the detector using the phenomenon of eddy currents. This article presents the developed detector system solution. The correct operation of a detector is conditional upon the possibility to detect the presence of a blade in the detection field in a reliable manner, while maintaining the resistance to interference. The developed system is resistant to changes in parameters due to the use of a differential system consisting of two detector coils connected in a bridge circuit, a rectifier circuit with filters acting as a demodulator and a comparator. The system works with a microprocessor performing data processing functions. The executed functional model was tested in a laboratory, which enabled to determine its characteristics in several configurations and to confirm its correct operation.
Infrared Signature Suppression Systems in Modern Military Helicopters
Authors: Paszko Mateusz 
Published: June 2019

Abstract
Helicopters play an important role in air-to-ground fire covering and the short-distance air-to-air fights, as well as the anti-tank missions and battlefield force transferring. The detection and survivability of helicopters on a battlefield significantly depends on their infrared emissions level, as well as the methods, equipment and systems used by potential enemy. The automatic detection systems, recognition and identification of flying objects use among other the thermo-detection methods, which rely on detecting the infrared radiation emitted by the tracked object. Furthermore, due to low-altitude and relatively low flight speed, today’s combat assets like missile weapons equipped with infrared guidance systems are one of the most important threats to the helicopters performing combat missions. Especially meaningful in a helicopter aviation is infrared emission by exhaust gases, egressed to the surroundings. Due to high temperature, exhaust gases are a major factor in detectability of a helicopter performing air combat operations. In order to increase the combat effectiveness and survivability of military helicopters, several different types of the infrared suppressor (IRS) have been developed. This paper reviews contemporary developments in this discipline, with particular examples of the infrared signature suppression systems.
Improvement and Optimisation of Gyroplane Performance
Authors: Stalewski Wieńczysław 
Published: June 2019

Abstract
The aim of this study was to investigate possibilities of improving performance characteristics of light gyroplane, as well to propose new or improved solutions enhancing performance of this type of rotorcraft. The study has been conducted based on computational methods of Computational Fluid Dynamics, Flight Dynamics, Computer Aided Design and Optimisation. Results of the research confirm that using advanced computational methods it is possible to improve significantly the performance characteristics of light gyroplane. It can be achieved both through optimisation of the main rotor design and flight control strategy. An unconventional approach to rotorcraft optimisation has been presented, distinguishing by the fact that the objective was calculated based on computer simulations of selected states of gyroplane flight. One of the optimised main rotors had already been examined during flight tests, which confirmed its good perfonnance-and-exploitation properties and its advantage over classic gyroplane rotors. Developed by the author the family of gyroplane airfoils is a valuable alternative to classic airfoils utilised so far. The same applies to the blades built based on those airfoils. In particular, it concerns the unconventional design of the rotor blade of span-variable: chord and relative thickness. The developed methodology of numerical optimisation of flight-control strategy during the jump takeoff of the gyroplane presents an original approach to those problems and may be valuable tool supporting gyroplane-pilot training.
The Role of Internal Corporate Governance Mechanism in Accounting Conservatism
Authors: Nur Mardiani , Anugerah Rita , Indrawati Novita 
Published: June 2019

AbstractObjective – This study aims to analyze the influence of internal mechanisms (independent commissioner, ownership structure and audit committee) on accounting conservatism in mining companies listed on the Indonesia Stock Exchange for the period of 2015-2017. Design/methodology – Secondary data in the form of financial statements are collected from the sub-sector companies in mining industry from the Indonesian capital market directory (ICMD). The data is taken from companies listed in Indonesia stock exchange for the period of 2015-2017. Samples are determined by using purposive sampling method and are selected based on certain considerations or criteria. The analysis model used in this study is path analysis. Results – The results of this study prove that independent commissioners, ownership structures and audit committees have a positive effect on accounting conservatism. Research limitations/implications – This study is perhaps limited in the number of variables used to test the model. There may be other variables that affect accounting conservatism so that further studies can extend this study by utilizing more variables.
Changes in Structure and Function of the Back Muscles in Low Back Pain: Different Time Points, Observations, and Mechanisms
Authors: Hodges Paul W. , Danneels Lieven 
Published: June 2019

Synopsis Spinal health depends on optimal back muscle performance, and this is determined by muscle structure and function. There has been substantial research evaluating the differences in structure and function of many back muscles, including the multifidus and erector spinae, but with considerable variation in results. Many studies have shown atrophy, fat infiltration, and connective tissue accumulation in back muscles, particularly deep fibers of the multifidus, but the results are not uniform. In terms of function, results are also somewhat inconsistent, often reporting lower multifidus activation and augmented recruitment of more superficial components of the multifidus and erector spinae, but, again, with variation between studies. A major recent observation has been the identification of time-dependent differences in features of back muscle adaptation, from acute to subacute/recurrent to chronic states of the condition. Further, these adaptations have been shown to be explained by different time-dependent mechanisms. This has substantial impact on the rationale for rehabilitation approaches. The aim of this commentary was to review and consolidate the breadth of research investigating adaptation in back muscle structure and function, to consider explanations for some of the variation between studies, and to propose how this model can be used to guide rehabilitation in a manner that is tailored to individual patients and to underlying mechanisms. J Orthop Sports Phys Ther 2019;49(6):464–476. doi:10.2519/jospt.2019.8827
Cutting to the Pathophysiology Chase: Translating Cutting-Edge Neuroscience to Rehabilitation Practice in Sports-Related Concussion Management
Authors: Chen Yufen , Herrold Amy A. , Gallagher Virginia T. , Reilly James L. , Parrish Todd , Breiter Hans C. 
Published: June 2019

Synopsis Mild traumatic brain injury, or concussion, is a common sports injury. Concussion involves physical injury to brain tissue and vascular and axonal damage that manifests as transient and often nonspecific clinical symptoms. Concussion diagnosis is challenging, and the relationship between brain injury and clinical symptoms is unclear. The purpose of this commentary was to translate cutting-edge neuroscience to rehabilitation practice. We (1) highlight potential biomarkers that may improve our understanding of concussion and its recovery, (2) explain why researchers must address the paucity of concussion research in female athletes, and (3) present female-specific factors that should be accounted for in future studies. Integrating objective, quantitative measures of concussion pathophysiology with concussion history, genetics, and genomics will help caregivers identify concussed athletes, tailor recovery protocols, and protect athletes from potential long-term effects of cumulative head impact. J Orthop Sports Phys Ther 2019;49(11):811–818. Epub 1 Jun 2019. doi:10.2519/jospt.2019.8884