| 1. |
- Özkılıç, Yasin Onuralp, et al.
(author)
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Optimum usage of waste marble powder to reduce use of cement toward eco-friendly concrete
- 2023
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In: Journal of Materials Research and Technology. - : Elsevier. - 2238-7854 .- 2214-0697. ; 25, s. 4799-4819
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Journal article (peer-reviewed)abstract
- In this study, waste marble powder (WMP) was used to replace cement of concrete in specific amounts. To accomplish this aim, WMP was replaced at 10%, 20%, 30%, and 40% of the cement weight, and a reference concrete sample without WMP (REF) was created to compare the compressive strength, splitting tensile strength, and flexural strength. The replacement of WMP at 10%, 20%, 30%, and 40% of the cement weight resulted in 5.7%, 21.7%, 38.1%, and 43.6% decreases in the compressive strength compared with REF. Furthermore, the splitting tensile strength results commonly followed the same trend as the compressive strength. However, WMP at 10%, 20%, 30%, and 40% led to 5.3%, 8.6%, 19.4%, and 26.7% decreases in the flexural strength compared with REF. In addition, three different calculations, ranging from simple to complex, were proposed to compute mechanical resistances of concrete with WMP. These proposed calculations for practical applications were validated using values from the literature and the implications obtained from the current research. While the simple calculations were based on the strength of REF and the WMP percentages, the complex calculations were dependent on the design of the concrete mixture, age of the samples, and the WMP percentages. For the complex calculations, the ANN approach was used with the help of the coefficient of determination (R2) for the K-fold cross validation method. All the proposed methods provided high accurate estimation to predict the properties of concrete with WMP. Based on the studies, utilizing 10% WMP as the replacement of cement is recommended to obtain the optimum benefits considering both mechanical and environmental aspects. Moreover, scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analyses were then conducted to observe the interaction of WMP in concrete. According to the SEM analyses, some pores were detected and the interfacial transition zone was observed in the reaction zone. On the other hand, based on the EDX analyses, the presence of WMP in concrete was manifested by the presence of high levels of calcium.
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| 2. |
- Hemlin, S., et al.
(author)
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- 2013
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In: Handbook of Research on Creativity. - : Edward Elgar Publishing Ltd.. - 9780857939814 - 9780857939807 ; , s. 508-521
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Book chapter (other academic/artistic)
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| 3. |
- Berndtsson, Inger, 1957, et al.
(author)
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- 2007
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In: Nya Synvärlden. - 1401-4742. ; :1, s. 17-19
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Journal article (other academic/artistic)abstract
- Denna artikel handlar om hur vi som professionella inom rehabilitering/habilitering för personer med synnedsättning/blindhet kan arbeta för att tillsammans dela och utveckla ny kunskap inom våra respektive områden.
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| 4. |
- Rönnberg Sjödin, David, et al.
(author)
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- 2015
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Conference paper (peer-reviewed)abstract
- Absorptive capacity, conceptualized as identifying, selecting and integrating useful knowledge from the environment into commercial applications, is a key capability for any organization, team or individual. While prior literature has made substantial advancement into the performance consequences of absorptive capacity, few studies have addressed what actually constitutes ACAP on a micro level. Thus, there exists a significant gap within the literature concerning the micro-foundations of ACAP. This study attempts to fill this gap by means of multiple case studies within the R&D organizations of three multinational engineering firms. Our findings show how the micro foundations of absorptive capacity are rooted in individual skills, roles and relationships.
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| 5. |
- Öztürk, İbrahim, et al.
(author)
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Preferred level of vehicle automation : How technology adoption, knowledge, and personality affect automation preference in Türkiye and Sweden
- 2024
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In: Cogent Psychology. - : Taylor & Francis. - 2331-1908. ; 11:1
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Journal article (peer-reviewed)abstract
- The acceptance of automated vehicles and advanced vehicle technologies by users is subject to different human factors variables. Personality, technology adoption, and prior previous knowledge about the systems have been significant determinants of people’s attitudes toward new technologies across different settings. The present study examined the effects of technology adoption, knowledge of vehicle automation, and personality on the preferred level of vehicle automation in Türkiye and Sweden. The study was conducted with 297 drivers from Türkiye (age: M = 22.47, SD = 2.83) and 332 drivers from Sweden (age: M = 30.06, SD = 10.48). Participants completed a questionnaire regarding technology adoption, knowledge and preference of vehicle automation, and the Basic Personality Traits Inventory (BPTI). The findings indicated that high technology adoption was associated with preferring higher levels of automation. Furthermore, drivers from Türkiye, in comparison to drivers from Sweden, and drivers with previous knowledge of high or full automation, compared to those who have not heard of these systems in the two countries, expressed a preference toward higher levels of automation. High extraversion and openness to change were associated with high technology adoption, leading to preferring vehicles with higher levels of automation.
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| 6. |
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| 7. |
- Gustavsson Tingvall, Patrik, et al.
(author)
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- 2006
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In: Economics of Innovation and New Technology. - : Routledge. - 1043-8599 .- 1476-8364. ; 15:2, s. 101-118
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Journal article (peer-reviewed)abstract
- We test whether predictions of the Aghion et al. (Aghion, P., Bloom, N., Blundell, R., Griffith, R. and Howitt, P. (2004) Competition and Innovation: An Inverted U Relationship. NBER Working Paper series, No. 9269.) model are supported by firm-level data. In particular, we analyze if there is an inverted U-shaped relation between competition and R&D. Results show that the inverted U-shaped relation is supported by the Herfindahl index but not by the price cost margin. Using the Herfindahl index, results suggest that breaking up monopolies increases R&D, whereas further increases in competition most likely lead to reduced R&D. Comparing different estimators, we find that time series-based estimators typically result in less clear-cut results, probably driven by a lack of time series variation in measures of competition.
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| 8. |
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| 9. |
- Özgünoglu, Mehmet, 1989, et al.
(author)
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Numerical Assessment of Cavitation Erosion for a Nozzle Flow Configuration
- 2021
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In: 11th International Symposium on Cavitation (CAV2021).
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Conference paper (peer-reviewed)abstract
- The main purpose of this study is to numerically investigate and predict the cavitation erosion mechanisms in a nozzle flow configuration. To do this, an injector type geometry is numerically investigated with the open-source CFD package OpenFOAM. A compressible Euler approached is applied for two operating conditions, where results are compared with other studies from the literature. Spectral statistics and maximum surface pressure results are compared with experiments. Results show that the proposed modelling approach is capable to explain main cavitation structures that promotes erosion.
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| 10. |
- Özkan, Emre, 1980-, et al.
(author)
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A Bayesian Approach to Jointly Estimate Tire Radii and Vehicle Trajectory
- 2011
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In: Proceedings of the International IEEE Conference on Intelligent Transportation Systems. - Washington DC, USA : IEEE conference proceedings. - 9781457721984 ; , s. 1-6
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Conference paper (peer-reviewed)abstract
- High-precision estimation of vehicle tire radii is considered, based on measurements on individual wheel speeds and absolute position from a global navigation satellite system (GNSS). The wheel speed measurements are subject to noise with time-varying covariance that depends mainly on the road surface. The novelty lies in a Bayesian approach to estimate online the time-varying radii and noise parameters using a marginalized particle filter, where no model approximations are needed such as in previously proposed algorithms based on the extended Kalman filter. Field tests show that the absolute radius can be estimated with millimeter accuracy, while the relative wheel radius on one axle is estimated with submillimeter accuracy.
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