6 research outputs found
Children’s educational and recreational engagement with digital technology and its potential learning and developmental outcomes from the perspective of practitioners and parents
No full textChildren’s play in contemporary society is influenced by digital devices, both in their homes and educational settings, including preschool children. This thesis explores children's digital play within and outside of educational settings from the perspective of practitioners and parents, addressing gaps in understanding how children’s digital play in different environments and their potential learning and developmental outcomes. Adopting a mixed-method approach, the thesis combines quantitative and qualitative research to provide a holistic understanding of digital play. Quantitative data consisted of 188 parents who attended the online survey, while qualitative data were gathered through semi-structured interviews with 11 parents and 12 practitioners.Quantitative data were analysed using chi-square tests, with Gamma used for ordinal relationships and Cramer’s V for measuring the strength of associations between nominal variables. It demonstrated that older children spend more time using computers and reading/writing apps. Boys spent more time playing video games, whereas girls preferred drawing apps. Qualitative data were analysed employing thematic analysis, and Bronfenbrenner’s Ecological Systems Theory (EST) was adapted to contextualise digital play. Qualitative data identified the similarities and differences between digital engagement at home and in school. Both parents and practitioners asserted the value of educational and recreational engagement. They reported the impacts of recreational and educational engagement on children’s cognitive, language, creative, social-emotional, and physical development, including problem-solving skills, language acquisition, imagination and social-emotional skills. Educational engagement was more structured and goal-driven, while recreational play allowed more child autonomy. Furthermore, parents and practitioners raised concerns about the negative consequences of excessive screen time and inappropriate content, such as addiction, negative behaviours, speech delay and reduced attention span. Practitioners underscored the importance of parental active mediation and involvement in children’s digital play to mitigate adverse effects.Although the data aim to investigate micro- and meso-systems of children’s digital play, the findings also reveal influences from the exosystem, macrosystem, and chronosystem, such as school conditions, the effects of cultural norms and the COVID-19 pandemic. Overall, understanding digital play through EST offers a multi-dimensional perspective by incorporating parents, practitioners and policymakers, providing valuable implications for educational practice and policy development
An application of adaptive neuro fuzzy inference system for estimating the uniaxial compressive strength of certain granitic rocks from their mineral contents
No full textWOS: 000311133600012The uniaxial compressive strength (UCS) of rocks is an important intact rock parameter, and it is commonly used for various engineering applications. This parameter is mainly controlled by the mineralogical and textural characteristics of rocks. In this study, a soft computing method, an adaptive neuro-fuzzy inference system (ANFIS), was employed to estimate UCS from the mineral contents of certain granitic rocks selected from Turkey; nonlinear multiple regression analysis was then employed to validate these estimations. Five nonlinear multiple regressions and ANFIS models were constructed with three inputs: quartz, orthoclase and plagioclase. To determine the optimal model, various performance indices (R, values account for and root mean square error) were determined, and the model obtained from dataset #3 was selected as the optimal model. The coefficients of correlation for the nonlinear multiple regression and ANFIS models were 0.87 and 0.91, respectively. Thus, both models yielded acceptable results, and the ANFIS is a suitable method for estimating the UCS of rocks. (C) 2012 Elsevier Ltd. All rights reserved
Combination of discontinuity characteristics and GIS for regional assessment of natural rock slopes in a mountainous area (NE Turkey)
No full textGeographical Information Systems (GIS) have a very large spectrum of users. As in many engineering applications, GIS are frequently used in geotechnical projects, especially in producing various thematic and zoning maps such as various susceptibility and hazard maps. Instability maps for large areas with similar characteristic can be produced in a practical way by evaluating the results obtained by the data collected from field and laboratory studies
Evaluation of geo-mechanical properties of very weak and weak rock materials by using non-destructive techniques: Ultrasonic pulse velocity measurements and reflectance spectroscopy
No full textThe main purpose of this study is to evaluate the geo-mechanical properties of very weak and weak rock materials by using ultrasonic pulse velocity measurements and considering specifically detailed mineralogical compositions. For the purpose, P-wave velocity (V-p) measurements of 66 core samples of the sedimentary rocks including claystones and mudstones collected from Firuzkoy area of Istanbul (Turkey) were carried out. Unconfined Compressive Strength (UCS) tests were then conducted. The axial deformations recorded during the UCS tests were also evaluated and the elastic moduli of the rock materials (E-i) were calculated. Statistical relations were investigated between the values of P-wave velocity measurements and the UCS and E-i. In order to evaluate the effects of detailed mineralogical compositions on the prediction performances of the empirical equations V-p-UCS and V-p-E-i, the reflectance spectroscopy was introduced. 1035 spectral measurements were taken from smooth and fresh surfaces of the failed core samples. Different genetic rock types were defined according to crystal field effect and charge transfer absorptions of transition elements, and water and OH vibrational spectral diagnostics. The statistical relations were reinvestigated, and the individual empirical equations were reproduced for each genetic rock type. The mean values of the multiple coefficients of correlations (R) were obtained to be 0.904 and 0.916 for the equations of V-p-UCS and V-p-E-i. Considering the maximum values of R, the increment rates for the values of the explained variances reach up to 14.3% and 13.5% for the equations, respectively. Additionally, according to the results of the analysis of variance (ANOVA) evaluations, the empirical equations of V-p-UCS and V-p-E-i reproduced for each genetic rock type were found to be statistically significant at the significance level of 0.05. As a consequence, the non-destructive techniques V-p measurements and reflectance spectroscopy could be efficiently used together for the evaluation of the geo-mechanical properties of very weak and weak rock materials in particular. (c) 2013 Elsevier B.V. All rights reserved.Hacettepe University Scientific Research Unit Ankara, Turkey [07 01 602 001]The core samples were provided by the Hacettepe University Scientific Research Unit Ankara, Turkey with the project 07 01 602 001, and used with the permission of the project leader Prof. Dr. Candan Gokceoglu. The author also would like to gratefully thank to Mr. Murat Koruyucu and Dr. Engin O. Sumer for providing necessary conditions in order to implement spectroscopic measurements and XRD analyses
Análisis bibliométrico de la actividad científica de los investigadores del CSIC en tres áreas, Biología y Biomedicina, Ciencia de los Materiales y Recursos Naturales : una aproximación metodológica a nivel micro (Web of Science, 1994-2004)
No full textEffects of amitraz plus Parapoxvirus ovis on EGF, VEGF, IGF-1 and IGF-2 in canine generalized demodicosis
No full textObjective. The purpose of the study is to investigate the effect of treatment with amitraz plus-Parapoxvirus ovis (IPPVO) on serum concentrations and skin expressions of insulin-like growth factor (IGF)-1 and -2, epidermal growth factor (EGF), vascular endothelial growth factor (VEGF), in dogs suffering from generalised demodicosis (GD). Materials and Methods. GD affected dogs were injected 1 ml IPPVO on days 0, 2 and 9 subcutaneously in addition to amitraz (0.025%) treatment twice weekly for 80 days. IGF-1, IGF-2, EGF and VEGF concentrations in blood serum were measured by canine-specific enzyme-linked immunosorbent assay kit. EGF, VEGF, IGF-1, and IGF-2 expressions in skin biopsy specimens were examined immunohistochemically. Results. After the treatment of the dogs with amitraz plus-IPPVO in GD, we demonstrated a significant reduction in both circulating concentrations and skin expressions of EGF, VEGF, IGF-1, and IGF-2, which have a role in preserving skin integrity and wound healing. Conclusions. Results of this study suggest that IGF-1, IGF-2 EGF, and VEGF have a crucial role in the progression of GD in dogs. It is believed that the findings from this study will contribute to the development of new strategies for the treatment of GD, which is an important health problem for dogs. © The Author(s) 2021. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by-nc-sa/4.0/), lets others remix, tweak, and build upon your work non-commercially, as long as they credit you and license their new creations under the identical terms.Ondokuz Mayis Üniversites
