38 research outputs found
THE DEVELOPMENT PROBLEM UNDER EMBODIMENT
No full textWe study technology adoption in an optimal growth model with embodied technical change. The economy consists of the final good sector, the capital sector, and the technology sector which role is the imitation of exogenous innovations. Labor resources are scarce. They are freely allocated to the technology and final good sectors. The final good is freely allocated to consumption and to the capital sector. We analytically characterize the optimal allocation decisions in the long run. Using a calibrated version of the model, we find that an acceleration in the rate of embodied technical change should not be responded by an immediate and strong adoption effort. Instead, adoption labor should decrease in the short run, and the optimal technological gap is shown to increase either in the short or in the long run. The state of the institutions and policies around the technology sector is key in the design of the optimal adoption timing.Embodiment, Technology adoption, Technological gap, Transition dynamics
TECHNOLOGY ADOPTION, CAPITAL MAINTENANCE AND THE TECHNOLOGICAL GAP
No full textWe study optimal growth models à la Nelson and Phelps (1966) where labor resources can be allocated either to production, technology adoption or capital maintenance. We first characterize the balanced growth paths of a benchmark model without maintenance. Then we introduce the maintenance activity via the depreciation rate of capital. We characterize the optimal allocation of labor across the three activities. Though maintenance deepens the technological gap by diverting labor resources from adoption, we show that it generally increases the long run output level. Moreover we find that equilibrium maintenance and adoption efforts respond in opposite directions to policy or technology shocks. When a technological shock occurs, the reduction of the equilibrium technological gap is incompatible with welfare maximization. Finally, we find that the long term output response to policy shocks is slightly higher in the presence of maintenance.Adoption, Maintenance, Technological gap, Output gap
What to do with conspiracy theories?: Insights from contemporary Turkey
No full textThis article presents ethnographic insights into the everyday lives of people who circulate conspiratorial narratives through an ethnographic study of ultranationalist men in contemporary Turkey. Drawing on the findings of this research, the author suggests that conspiratorial discourses should be examined not solely in terms of their (anti‐)truth qualities but as social practices through which masculine subjectivities and socialities are engendered. The author then explores how the circulation of conspiratorial narratives forges agency and political subjectivity for the men involved, while also inducing sociopolitical effects such as vigilantism and paramilitary violence. This article contends that through the circulation of conspiratorial narratives and everyday engagements with vigilantism and extralegal violence, the men reconfigure sovereignty and the way that the state operates in contemporary Turkey. The findings of this research suggest that the focus should be moved away from the epistemological shortcomings of conspiratorial narratives or strategies to debunk them – such as fact‐checking – which presume that exposure of ‘the truth’ would lead to the dissolution of ‘untruthful’ conspiracies. Rather, the author suggests that researchers attend to the particular forms conspiracies take in concrete situations, how they mould political subjectivities and social groups and reconfigure the ways that the state operates alongside the law in other similar settings. </p
A study of two-dimensional superconductivity at oxide interfaces using waveguide resonators
No full textQN/Steele La
Glasba brez meja:: raziskovalni primer o novih metodologijah poučevanja glasbe na dunajskih osnovnih in srednjih šolah
No full textThis article presents some of the results of a research project which the author conducted between 2015 and 2018. The influences of the music lessons which were offered within the framework of this research project is the main subject of this article. It shows how children with and without migrant backgrounds can improve their bi- and multi-musical identities in their transcultural spaces through these music lessons. Providing an insight into possibilities of intercultural music education in Viennese primary schools is the central aim of this paper.Članek predstavlja nekatere rezultate projekta, ki ga je avtorica izvajala med letoma 2015 in 2018. Glavna tema prispevka je vpliv pouka glasbe, kateremu so učenci prisostvovali v okviru dotičnega raziskovalnega projekta. Članek pokaže, kako lahko otroci – z migrantskim ozadjem ali brez – s poukom glasbe okrepijo svoje dvo- ali večglasbene identitete v medkulturnih prostorih. Ključni namen pričujočega članka je predstaviti vpoglede v različne možnosti medkulturne glasbene vzgoje na dunajskih osnovnih šolah
Concentration Based Multicolor Upconversion Emission of Lanthanides Co -Doped Ruddlesden-Popper Type Layered Perovskites
No full textYb3+ ions initiated upconversion properties of Ruddlesden-Popper type layered materials were studied to elucidate the tunability of the visible emission under 980 nm excitation. The substitution of lanthanum ions in the host layer perovskites with different concentrations of Yb3+/Er3+ and Yb3+/Tm3+ as the sensitizer/activator pairs was performed via the solid-state procedure. The upconversion spectra of the samples have depicted that the materials relatively lower dopant concentrations of Yb3+/Er3+ have the green color, which was shifted to the red region due to both heavy activator and sensitizer concentrations because of the dominant F-4(9/2) -> I-4(15/2) transition rather than the H-2(11/2), S-4(3/2) -> I-4(15/2) transitions. The tunability of upconversion emission of Yb3+/ Tm3+ introduced materials was limited in the visible region compared to the Yb3+/Er3+ pair despite the fact that the wide variety of the lanthanide concentrations were studied and the layered materials were structured successfully. On the other hand, the first intense NIR emission was achieved for the layered perovskites co-doped with Yb3+/Tm3+ due to the H-3(4)-> H-3(6) relaxation.Scientific and Technological Research Council of Turkey [117M512]; Koc University Surface Science and Technology Center (KUYTAM)This work was supported by The Scientific and Technological Research Council of Turkey [Grant number 117M512]. The author gratefully acknowledges the technical expertise for UC measurements and continuous discussion and advice provided by Assoc. Prof. Dr. Ugur Unal. The author also would like to thank Koc University Surface Science and Technology Center (KUYTAM). The author declares no competing financial interests
On the Spectrum of a Discrete Non-Hermitian Quantum System
No full textIn this paper, we develop spectral analysis of a discrete non-Hermitian quantum system that is a discrete counterpart of some continuous quantum systems on a complex contour. In particular, simple conditions for discreteness of the spectrum are established.This paper is a contribution to the Proceedings of the VIIth Workshop “Quantum Physics with NonHermitian Operators” (June 29 – July 11, 2008, Benasque, Spain). This work was supported by Grant 106T549 from the Scientific and Technological Research Council of Turkey (TUBITAK). The author thanks Mesude Saglam and Gusein Guseinov for useful discussions
Pretend‐but‐perform regulation of a duopoly under three competition modes
No full textArticle; Early AccessThis paper considers a duopoly with asymmetric costs and demand uncertainty to study the welfare effects of the pretend-but-perform regulation (PPR) under three modes of competition, involving the Cournot, conjectural variations, and supply function competitions. The PPR induces a two-stage game where each firm declares in the first stage a cost report and produces in the second stage accordingly. Theoretically, characterizing and numerically computing the equilibrium of this game, we show that the consumer surplus increases if the PPR is applied under the Cournot competition and it decreases if the PPR is applied under the other modes of competition.The author thanks two anonymous reviewers for helpful comments and suggestions that have greatly improved the paper. The author also thanks Haldun Evrenk for his helpful comments. The usual disclaimer applies.The author thanks two anonymous reviewers for helpful comments and suggestions that have greatly improved the paper. The author also thanks Haldun Evrenk for his helpful comments. The usual disclaimer applies
Tool wear monitoring in bandsawing using neural networks and Taguchi’s design of experiments
No full textThe bandsawing as a multi-point cutting operation is the preferred method for cutting off raw materials in industry. Although cutting off with bandsaw is very old process, research efforts are very limited compared to the other cutting process. Appropriate online tool condition monitoring system is essential for sophisticated and automated machine tools to achieve better tool management. Tool wear monitoring models using artificial neural network are developed to predict the tool wear during cutting off the raw materials (American Iron and Steel Institute 1020, 1040 and 4140) by bandsaw. Based on a continuous data acquisition of cutting force signals, it is possible to estimate or to classify certain wear parameters by means of neural networks thanks to reasonably quick data-processing capability. The multi-layered feed forward artificial neural network (ANN) system of a 6 x 9 x 1 structure based on cutting forces was trained using error back-propagation training algorithm to estimate tool wear in bandsawing. The data used for the training and checking of the network were derived from the experiments according to the principles of Taguchi design of experiments planned as L (27). The factors considered as input in the experiment were the feed rate, the cutting speed, the engagement length and material hardness. 3D surface plots are generated using ANN model to study the interaction effects of cutting conditions on sawblade. The analysis shows that cutting length, hardness and cutting speed have significant effect on tooth wear, respectively, while feed rate has less effect. In this study, the details of experimentation and ANN application to predict tooth wear have been presented. The system shows that there is close match between the flank wear estimated and measured directly.[2003/179]This experimental study was supported by a Scientific Research Projects, no. 2003/179. The author would also like to thank IMAS A. S. for providing the machine and materials for conducting the experiments
On the Spectrum of a Discrete Non-Hermitian Quantum System
No full textIn this paper, we develop spectral analysis of a discrete non-Hermitian quantum system that is a discrete counterpart of some continuous quantum systems on a complex contour. In particular, simple conditions for discreteness of the spectrum are established.This paper is a contribution to the Proceedings of the VIIth Workshop “Quantum Physics with NonHermitian Operators” (June 29 – July 11, 2008, Benasque, Spain). This work was supported by Grant 106T549 from the Scientific and Technological Research Council of Turkey (TUBITAK). The author thanks Mesude Saglam and Gusein Guseinov for useful discussions
