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3. 2D speckle-tracking in assessment of myocardial strain in children with hypertrophic cardiomyopathyNadezhda Chernykh, Alla Tarasova, Olga Groznova, 2021, izvirni znanstveni članek Ključne besede: 2D sledenje ultrazvočnega vzorca., deformacija miokarda, ehokardiografija, hipertrofična kardiomiopatija, zgodnja diagnoza, zdravljenje, otrok, 2D speckle tracking, strain, echocardiography, hypertrophic cardiomyopathy, early diagnosis, treatment, children
Objavljeno v DKUM: 22.01.2023; Ogledov: 143; Prenosov: 14
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4. Questionable research practices : an introductory reflection on causes, patterns and possible responsesGorazd Meško, Aleksander Koporec, 2010, pregledni znanstveni članek Opis: Purpose:
The purpose of this article is to discuss deviance in science due to increasing pressures on researchers and higher education pedagogues to be more effective and efficient in the ‘academic production’.
Design/Methods/Approach:
A literature review and reflection.
Findings:
The authors present a criminological view of deviance in science, discussing the perception of unsuitable scientific and research practices, questionable research practices, ethics and integrity in science, suitable behaviour of researchers in scientific work, and make recommendations for improving the ethics of scientific research in practice. The discussion on deviance in science is based on Merton’s principles of science (1973): the public presentation of knowledge and sharing of ideas, leading to common ownership of scientific discoveries, in which scientists disclaim their intellectual rights to their own insights in exchange for recognition and reputation. An impartial approach and universalism, in which truth is judged by impersonal, universal criteria, rather than based on race, social and economic status, sex, faith, or nationality and other subjective categories is presented and questioned. A non-profit/selfless orientation in which scientists are rewarded for selfless activities, and planned/organized scepticism – that all ideas must be tested, subject to rigorous scientific rules and public disclosure. The authors discuss these principles and connect them with scientific and research practice in Slovenia and abroad.
Research limitations/implications:
Research results are generalisable as deviance in science occurs in all cultures and have a global impact. Deviance in science is still an under-researched taboo topic and it needs to be discussed.
Practical implications:
A useful source of information for awareness raising and the improvement of quality of research work.
Originality/Value:
This paper extends understanding of possible deviance in science and factors related to such practices. The main value of this reflection is to facilitate understanding of factors of deviance in science and trigger a discussion on deviance among scientists.
Ključne besede: science, deviance, research, academic promotion standards, strain
Objavljeno v DKUM: 12.05.2020; Ogledov: 908; Prenosov: 31
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5. Work-Home conflict and strain: the role of work-related smartphone use, job insecurity and segmentation preferencesTjaša Srnko, 2018, magistrsko delo Opis: Nowadays, through organisational and technological changes, organizations expect availability and work from their employees not just during working hours, but also in their free time. Work can be done from anywhere and at any time, also with the help of smartphones, which is one of the main constructs of the current research. If the employee is working from home on their smartphone, this can have an important contribution to managing work and private life, and also to strain. The individual’s preference of whether to segment his or her work from home also plays an important role in experiencing internal conflicts. As the motivation for work-related smartphone use is not fully clear, job insecurity was additionally explored as a potential predictor. In an online study, conducted in Austria, we collected data from 454 participants of different ages, gender and working backgrounds. For the analysis, multiple moderated regression and mediation analyses were used. Results showed significant relations between work-home interference and strain but no significant results between those constructs while adding work-related smartphone use. Segmentation preferences did not have an influence on the relationship between work-home interference and strain. Job insecurity was revealed to be related to work-related smartphone use and smartphone use to work-home interference. Smartphone use was also found to partially mediate the path from job insecurity to work-home interference. Finally, to prevent negative outcomes of strain, work-home interference and job insecurity, organizations should focus on: providing culture that fits their employees, try to plan availability free time and provide a clear communication.
Ključne besede: Smartphone use, work-home interference, strain, stress, job insecurity, segmentation preferences
Objavljeno v DKUM: 14.01.2019; Ogledov: 1268; Prenosov: 118
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6. Modified coefficient of subgrade reaction to laterally loaded pilesAyhan Gurbuz, 2018, izvirni znanstveni članek Opis: An accurate prediction of the load capacity of a laterally loaded pile at a permissible displacement is an important concern at the design stage. In contrast to many sophisticated methods, Broms’ method based on moment equilibrium has been preferred by engineers to predict the load capacities of laterally loaded piles due to both its simplicity and because it is established on a way of hand calculation. However, Broms’ method typically overestimates a pile’s lateral load capacity as it requires a constant coefficient of horizontal subgrade reaction (nh) into analyses, regardless of the magnitude of the pile’s top displacement. In this study, modified coefficients of subgrade reactions(nh*) that are sensitive to the pile’s top displacement in cohesionless soils are first proposed to improve the performance level of Broms’ method for the prediction of the load capacity of a laterally loaded pile as the pile’s top displacement increases. The modified values of nh* are calibrated using 45 independently free-head, single-driven, full-scale pile tests from 23 sites in cohesionless soils. It is demonstrated that Broms’ method with nh* would correctly estimate a pile’s lateral load-deflection behavior with accuracy levels similar to more complicated methods.
Ključne besede: Broms' method, coefficient of horizontal subgrade reaction, p-y curves, strain wedge model
Objavljeno v DKUM: 11.10.2018; Ogledov: 1024; Prenosov: 448
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7. A comparison of linear and nonlinear seismic tunnel-ground interaction analysesElefterija Zlatanović, Marina Trajković-Milenković, Dragan Lukić, Stanko Brčić, Vlatko Šešov, 2016, izvirni znanstveni članek Opis: In order to study the effects of a seismically induced tunnel–ground interaction, two-dimensional numerical analyses are performed using the sofware ANSYS. The study employs a coupled beam–spring model subjected to earthquake loading that is simulated under pure shear conditions and determined by a free-field ground-response analysis using the code EERA. The properties of the soil material are considered as both linear and nonlinear. The results obtained by linear dynamic analyses are compared with state-of-practice analytical elastic solutions. A comparison of the results of both linear and nonlinear analyses is also performed, and significant differences, as well as important factors influencing the tunnel–ground interaction for both cases, are evaluated.
Ključne besede: circular tunnel, linear/nonlinear soil behaviour, beam–spring model, plane-strain conditions, simplified dynamic FE analysis, soil–structure interaction
Objavljeno v DKUM: 18.06.2018; Ogledov: 934; Prenosov: 59
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8. Influence of the virtual strain rate of noncohesive granular media on the discrete element methodKiichi Suzuki, 2015, izvirni znanstveni članek Opis: The discrete element method (DEM) is an alternative computational tool for augmenting laboratory experiments because of its advantages in detailing macro- and micro-mechanical information. However, it should be noted that the DEM does not usually consider the convergence for each time step, because of the necessity for a huge calculation time. In that case, it indicates that the uniqueness of the solution is not guaranteed, except in the case of a very small strain rate, even though the behavior looks qualitatively reasonable. At first, the influence of strain rate among numerically imaginary input parameters for a non-cohesive material was investigated for monotonic, biaxial shear tests. Then, new findings were obtained from the DEM simulations. Strain rate has a significant influence on the shear behavior, especially after the peak strength of dense specimens. A quasi-static steady state exists, not a static steady state. The “strong” fabric ratio is closely related to the stress ratio. The maximum slip coordination number occurs around the phase-transformation ratio and the shear band appears around the peak strength.
Ključne besede: discrete element method, DEM, induced anisotropy, quasi-static steady state, strain rate, uniqueness
Objavljeno v DKUM: 14.06.2018; Ogledov: 844; Prenosov: 121
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9. Experimental research on variation of pore water pressure in constant rate of strain consolidation testHojjat Ahmadi, Hassan Rahimi, Abbas Soroush, Claes Alén, 2014, izvirni znanstveni članek Opis: Constant rate of strain (CRS) consolidation is a rapid test method which is used for determination of compressibility of clayey soils. In a CRS test, the appropriate strain rate is selected based on pore water pressure ratio, i.e. the ratio of pore pressure to total stress. In the present study, to investigate the effect of strain rate on variation of pore water pressure ratio, four different clay samples of different plasticity were tested by CRS apparatus. The results of the experiments showed that the trend of variation of pore water pressure is dependent on the drained water flow regime which may be either Darcy or non-Darcy. The results also indicated that the plasticity of clay does not have considerable effect on variation of pore water pressure.
Ključne besede: constant rate of strain, consolidation, pore water pressure ratio, soil plasticity, Darcy and non-Darcy flow
Objavljeno v DKUM: 14.06.2018; Ogledov: 801; Prenosov: 64
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10. A comparison between conventional triaxial and plane-strain compression on a particulate system using 3D DEMMahmud Sazzad, Kiichi Suzuki, 2012, izvirni znanstveni članek Opis: Granular materials such as sand are subjected to different stress paths depending on the in-situ conditions. For example, a granular system under the foundations experiences conventional triaxial compression (CTC), while it experiences plane-strain compression (PSC) in the case of the embankment of roads. Due to the difference in the stress paths, the behavior of granular materials also becomes different. This paper aims at comparing the behavior of granular materials under CTC and PSC conditions using the 3D discrete-element method (DEM). An isotropically compressed dense sample consisting of 8000 spheres was prepared numerically using periodic boundaries. The CTC and PSC tests were simulated using the same isotropically compressed dense sample to compare and explore the macro- and micro-mechanical responses of granular materials without any bias from the initial fabric of the numerical sample. Qualitatively, the simulated stress-strain responses are consistent with that observed in the experimental studies. The dilatancy index is found to be independent of the stress paths used in the present study. The b value (defined as b = (σ2 − σ3)/(σ1 − σ3) where σ1, σ2 and σ3 are the stresses in the x1 -, x2 - and x3 - directions, respectively) - axial strain curve has a close similarity with the stress ratio - axial strain curve for the PSC test. The evolution of the coordination number and the sliding contact fraction is independent of the stress paths. A link between the macro- and micro-quantities is observed and a unique macro-micro relationship is noticed, regardless of the stress paths applied in this study.
Ključne besede: conventional triaxial compression, plane-strain compression, micro response, DEM
Objavljeno v DKUM: 13.06.2018; Ogledov: 924; Prenosov: 57
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