| 1. |
- Heshmati, Almas, et al.
(författare)
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- 2013
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Ingår i: Research Evaluation. - : Oxford University Press (OUP). - 0958-2029 .- 1471-5449. ; 22:1, s. 15-29
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Tidskriftsartikel (refereegranskat)abstract
- This article introduces an agent-based simulation model representing the dynamic processes of cooperative R&D in the manufacturing sector of South Korea. Firms’ behaviors were defined according to empirical findings on a data set from the internationally standardized Korean Innovation Survey in 2005. Simulation algorithms and parameters were defined based on the determinants of firms’ likelihood to participate in cooperation with other firms when conducting innovation activities. The calibration process was conducted to the point where artificially generated scenarios were equivalent to the one observed in the real world. The aim of this simulation game was to create a basic implementation that could be extended to test different policies strategies in order to observe sector responses (including cross-sector spillovers) when promoting cooperative innovation. Based on the evaluation of simulated research collaboration data, sector responses to strategies concerning government intervention in R&D of the firms can now be assessed.
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| 2. |
- Özkirimli, Umut
(författare)
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Losing Yourself in Pain
- 2018
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Ingår i: Ahval.
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 3. |
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| 4. |
- Asplund, Matthias, et al.
(författare)
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- 2016
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Ingår i: Measurement. - : Elsevier BV. - 0263-2241 .- 1873-412X. ; 92, s. 19-27
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Tidskriftsartikel (refereegranskat)abstract
- Reliable data with less variation play a key role for acceptance of the usefulness of the measurement output of a wheel profile measurement system (WPMS) in a railway network. However, in practice, most studies are carried out without checking the reliability of data from such a system, which may lead to inappropriate maintenance strategies. To ensure the measurement capability of WPMS and to support robust maintenance in railway systems, this study has evaluated measurement data for the flange height, flange thickness, flange slope, and tread hollowing of rolling stock wheels by using gauge repeatability and reproducibility (GR&R). In this study, acceptance and rejection criteria for the precision-to-tolerance ratio (PTR), signal-to-noise ratio (SNR), and discrimination ratio (DR) have been employed to evaluate the measurement capabilities. For the purpose of illustration, we have implemented a new proposed approach. This approach involves both an analysis using graphs with four regions with a confidence interval (CI) of 95% and an analysis using a graph with three regions with only the predicted values; the latter type of graph represents an innovation made in this study. The results show that the measurements of the tread hollowing and flange slope are on an acceptable level, while those for the flange height and flange thickness have to be rejected as unacceptable. The action proposed to increase the quality of data on the flange height and flange thickness is to enhance the calibration of the WPMS. In conclusion, GR&R is a useful tool to evaluate the measurement capability of WPMS and to provide helpful support for maintenance decision making.
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| 5. |
- Özel, Sultan S., et al.
(författare)
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A facile synthesis of Ag2MnSnS4 nanorods through colloidal method
- 2022
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Ingår i: Turkish journal of chemistry. - : The Scientific and Technological Research Council of Türkiye (TÜBİTAK). - 1300-0527 .- 1303-6130. ; 46:4, s. 1291-1296
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Tidskriftsartikel (refereegranskat)abstract
- The production methods of semiconductor nanomaterials with new shapes and different compositions form the basis for the creation of high-performance structures in numerous applications. Kesterite structured materials are among these inorganic semiconductors and are suggested to be promising energy materials for the future. In this study, quaternary Ag2MnSnS4 nanocrystalline rods have been successfully synthesized for the first time by the colloidal hot-injection synthesis route and well-organized rod-like nanocrystals (NCs) with lengths ranging from 200 to 350 nm and widths from 10 to 30 nm were obtained. For this structure, the Ag2MnSnS4 exhibits a semiconductor property with a band-gap of approximately 1.3 eV. The optical properties and band-gap values were determined by UV-Vis absorption spectrum and using Tauc Equation. It has been observed that the Ag2MnSnS4 structure acquired by the proposed colloidal synthesis method can be an alternative to the commonly used materials based on Cd and Pb.
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| 6. |
- ÖZEN, MUSTAFA, 1984
(författare)
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Advanced Transmitter Architectures Based on Switch Mode Power Amplifiers
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Nowadays the main driving parameters for the research in radio transmitters in wireless infrastructure are energy efficiency, frequency agility, and integration.This thesis presents new solutions at the device waveform-, circuit-, and transmitter level which exploit the inherent high efficiency potential of switch-mode power amplifiers (SMPAs) for realization of energy efficient, wide-band, highly integrated transmitters for wireless communication applications.In the first part of the thesis, a continuum of novel high efficiency class-E power amplifier modes are derived, significantly extending the known SMPA design space. In contrast to conventional SMPA modes, the new continuum allows some variation for the switch impedances, providing important possibilities on wide-band SMPA designs. This is experimentally verified in a 1 W SiGe BiCMOS SMPA design having a drain efficiency of above 70% over a 1.3-2.2 GHz bandwidth.In the second part a novel combiner synthesis technique is developed that enables realization of wide-band highly efficient outphasing transmitters. The technique is based on the calculation of the combiner network parameters from the boundary conditions required for highly efficient switch-mode operation of the transistors in each branch. The approach is validated in a CMOS-GaN outphasing transmitter design providing a peak output power of 44 dBm and a 7.5 dB output power back-off efficiency exceeding 52% over a 750-1050 MHz bandwidth. It is further shown that the same theoretical approach can also be used for design of Doherty PA combiner networks. A 28 W 3.5 GHz Doherty PA is designed and manufactured for experimental verification providing a record-high power added efficiency of 51% at an adjacent channel leakage ratio (ACLR) of -50 dBc with carrier-aggregated 100 MHz LTE test signals.In the third part a new SMPA topology particularly suitable for amplification of RF pulse-width modulation (RF-PWM) signals is presented. In classical pulse width modulated SMPAs the varying pulse width leads to switching losses and hence efficiency degradation. We present an electronically tunable load output network that alleviates this problem.A 10 W 2 GHz CMOS-GaN RF-PWM transmitter demonstrator is constructed and characterized to demonstrate the feasibility of the proposed technique. ACLR after digital pre-distortion linearization is -45 dBc at a drain efficiency of 67% with W-CDMA communication signals.The solutions presented in this thesis will facilitate realizations of frequency agile, energy efficient and highly integrated/digitalized radio transmitters for future wireless communication systems.
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| 7. |
- Anderson, Helén, et al.
(författare)
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- 2000
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Ingår i: 16th IMP-conference, Bath, U.K, September 7-9, 2000.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Aad, G., et al.
(författare)
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- 2012
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swepub:Mat__t (refereegranskat)
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| 9. |
- Özdalga, Elisabeth
(författare)
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Den ofrånkomliga nationalismen
- 2011
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Ingår i: Sociologisk forskning. - : Sveriges sociologförbund. - 0038-0342 .- 2002-066X. ; 48:1, s. 51-61
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Tidskriftsartikel (refereegranskat)abstract
- The necessary nationalismThis article deals with the role of fictional narratives, especially the modern novel, in the formation of national identities. Naguib Mafouz’s Cairo trilogy is referred to as an example of how literature may both serve as the mirror image of national identities and as an agency in their formation. The sense of community attachment to a modern state is ”thinner” than to a family or traditional village and/or tribe, though no less vital. Drawing on Norbert Elias’s concept of ”survival unit,” Benedict Anderson’s ”imagined communities” and recent studies in the field of comparative literature by Gregory Jusdanis and Azade Seyhan, this article argues for the necessity of the nation – in spite of its unfavourable chauvinistic reputation. This contention is discussed in relation to recent literary developments in Turkey and recent debates on nationhood in a Swedish context.
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| 10. |
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