104 research outputs found
Dr. Yucel Yanikdag – Faculty Author Interview
No full textDr. Yucel Yanikdag, Associate Professor of History discusses his new book, Healing the Nation: Prisoners of War, Medicine and Nationalism in Turkey, 1914-1939, published recently by Edinburgh University Press. In this book, he explores how Ottoman prisoners of war and military doctors of the First World War discursively constructed their nation as a community, and at the same time attempted to exclude certain groups from that nation. Yanikdag aims to broaden the discussion of nationalism to explore how ideological and biological factors influenced each other
Before the Neolithic in the Aegean: The Pleistocene and the Early Holocene record of Bozburun - Southwest Turkey
No full textThe renewed Mesolithic research in the Greek mainland and the
islands has been providing new insights into the lively maritime
activity within the region; however, the southwest coast of Turkey
has been virtually devoid of related investigations until the commencement of the Bozburun Prehistoric Survey project in 2017. The
aim of this paper is to give an overview of the prehistoric sites discovered at the Bozburun Peninsula during the 2017–2019 field seasons. Preliminary results indicate that the area is rich in prehistoric
activity. While Middle Paleolithic chipped stone industries were identified at the sites of Kayabas ̧ı Cave, C ̧akmak, and Sobalak, flake based
microlithic chipped stone industries typical of the Aegean Late
Pleistocene and Early Holocene were identified at the sites of Sarnıc ̧,
Hurma, Sobalak, Zeytinlik, and C ̧akmak. A variety of artifacts, suggestive of the Neolithic, were also recorded at the sites of Hurma,
Zeytinlik, and possibly at Sobalak and Sarnıc ̧. In specific, the presence of carinated end-scrapers, burins and polyhedric cores at
Sarnıc ̧, as well as some geometric microliths at Hurma, demonstrates
that Bozburun was frequented during the Upper Paleolithic and the
Epipaleolithic. The presence of a few geometric microliths made on
Melos obsidian at Hurma also demonstrates that the region was connected to the Aegean obsidian network routes at least by the beginning of the Holocene. If our relative dating is correct, this constitutes the earliest known use of Melos obsidian in the Anatolian mainland
Characterization and comparison of mine wastes in Can Coal Basin, northwest Turkey: a case study
No full textThe Can Coal Basin is a major coal-producing site in northwest Turkey that has faced acid mine drainage problems since the 1980s. This study characterized and compared mine wastes from the Etili and Comakli open-pit coal mines in the Can Coal Basin physically, mineralogically, and geochemically for acid mine drainage potential and metal(loid) mobility. Mineralogical analysis determined pyrite to be the major sulfide mineral in the Etili and Comakli coal and mine wastes, while dolomite and calcite were abundant in the mine wastes from the Comakli site. Concentrations of Al, As, Mn, and Pb in these mine wastes are higher than in Turkish and world coals. The enrichment factor showed moderate enrichment of Pb and significant enrichment of As in the Etili and Comakli mine wastes, respectively. Static tests indicated acid generation potential in all Etili and some Comakli mine wastes. The modified synthetic precipitation leaching procedure revealed that greater concentrations of Al, Fe, Mn, Ni, Pb, and SO42- were released from pyrite-rich mine wastes. Physical, mineralogical, and geochemical factors affecting acid mine drainage were highly variable within and between sites. Increasing concern over significant environmental health effects of low-pH, metal(loid)-polluted mine wastes necessitates remediation of the mine sites.Scientific Research Projects Coordination Unit of Canakkale Onsekiz Mart University [FBA-2016-759]This research was partly supported by the Scientific Research Projects Coordination Unit of Canakkale Onsekiz Mart University under FBA-2016-759 numbered project. The author thanks to Canakkale Onsekiz Mart University Science and Technology Application and Research Center for SEM-EDX analysis. The author is grateful to Assoc. Prof. Mehmet Ali Yucel for his help during field studies, Dr. Burcu Ileri for her assistance in laboratory work and Dr. Mehmet Karadeniz for his constructive comments. Furthermore, the author special thanks to the four anonymous reviewers for their valuable suggestions
Exchange Rate Pass-Through to Consumer Prices in Turkey: Nonparametric Kernel Estimation Evidence
No full textExchange rate pass-through (ERPT) in the Turkish economy appeared again, especially after mid-2018 when policies to re-balance and soft-land the economy failed to a wide extent. Such re-appearance of the feedback from exchange rates to domestic prices deserves investigative efforts, having recalled that part of the stabilization success of the Central Bank of Turkey in early 2000s directly stemmed from its ability to reduce ERPT. In this paper, we aim to contribute to current policy discussions on Turkey by presenting our nonparametric kernel-based density function and regression estimates of the pass-through effect. Our findings are indicative not only of a sizable level of ERPT but also of its dependence on the size of currency depreciation
An experimental study on friction reducing polymers in turbulent pipe flow
No full textAn experimental study was conducted to search the reduction of friction in fully developed turbulent pipe flow using different types of polyacrylamides as friction reducing polymers. Pressure drop measurements determined the friction reduction. Three different polymer types Superfloc A110, Superfloc A130 and Superfloc A150 were used to examine the effect of polymer concentration, Reynolds number and polymer type on friction reduction. The Darcy friction factor was obtained for each polymer type at the polymer concentration ranging from 0 to 500 wppm and a Reynolds number range of 10000-80000. It was observed that friction factor decreased with increment in polymer concentration and Reynolds number for each polymer. Higher molecular weight polymers are more effective at reducing friction. With increasing concentration of polymer, the measured data approaches the Virk asymptote, which represents the maximum friction reduction limit by the polymers. The percentage of friction reduction increased with increasing concentration of polymer up to 100 wppm for each polymer type and then began to decrease for polymer concentrations higher than 100 wppm. An empirical formula was obtained to calculate the Darcy friction factor as a function of Reynolds number and polymer concentration for Superfloc A110.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Marine and Transport Technolog
The New evidence for the Palaeolithic on the island of Gökçeada (Imbros), North Eastern Aegean
No full textEksino, on the island of Gökçeada (Imbros) in the Northeast Aegean, is a new open-air site with evidence of Palaeolithic cultural remains. Stone tools collected by an initial survey have clarified an assessment of the site from the Lower Palaeolithic, and brought to light new evidence from the Middle Palaeolithic as well as transition to the Upper Palaeolithic. Eksino is probably one of the most significant Lower Palaeolithic tool collections in the North Aegean, and finds such as chopper or chopping tools and Acheulean bifacial handaxes from the site show that the North Aegean may be another possible dispersal route from hominids to Europe via the East and Northeast Mediterranean during the Lower Palaeolithic. Middle Palaeolithic finds are frequent in the site and finds resemble the typical Mousterian type which is characterized by discoidal cores, Levallois cores and flakes, scrapers, denticulates, notches and points. Upper Palaeolithic finds are rare in the site, and a bifacial leaf point and large crescent-shaped backed pieces made on blades may reveal the presence of the Middle-Upper Palaeolithic transition on the island. This new data from Palaeolithic Gökçeada is likely to fill key geographic gaps associated with the initial dispersal of hominins through the northeast Aegean islands
Frame bit allocation for the H.264/AVC video coder via cauchy-density-based rate and distortion models
No full textBased on the observation that a Cauchy density is more accurate in estimating the distribution of the ac coefficients than the traditional Laplacian density, rate and distortion models with improved accuracy are developed. The entropy and distortion models for quantized discrete cosine transform coefficients are justified in a frame bit-allocation application for H.264. Extensive analysis with carefully selected anchor video sequences demonstrates a 0.24-dB average peak signal-to-noise ratio (PSNR) improvement over the JM 8.4 rate control algorithm, and a 0.33-dB average PSNR improvement over the TM5-based bit-allocation algorithm that has recently been proposed for H.264 by Li et al. The analysis also demonstrates 20 % and 60% reductions in PSNR variation among the encoded pictures when compared to the JM 8.4 rate control algorithm and the TM5-based bit-allocation algorithm, respectively
Energy Transition in The Dutch Dwelling Stock: Exploring the Extent of Inertia Against Change
No full textThe residential sector accounts for 30% of the total energy consumed by all sectors on average worldwide. This significant share makes an energy transition in the residential sector one of the most important frontiers of sustainability transitions. Netherlands aims to achieve a remarkable reduction in the energy consumption in residential buildings with policies mainly aiming at new constructions, and little attention is being paid to the existing dwelling stock. However, the existing dwelling stock creates an inertia against a transition. Although this is a widely accepted issue, the extent of such an inertia has not been analyzed explicitly. In that respect, we aim to conduct a preliminary study in order to demonstrate the importance of the existing dwelling stock, and the inertia it can cause during an energy transition process. Besides, we also aim to explore effectives of certain policy options that can alleviate this inertia. For that purpose, a simulation model is developed and initialized based on the Dutch housing system. The set of experiments discussed in the paper provides a better understanding about this inertia, as well as what needs to be done for achieving significant progress in a residential energy transition.Multi Actor SystemsTechnology, Policy and Managemen
Photosynthetic bacterial growth and productivity under continuous illumination or diurnal cycles with olive mill wastewater as feedstock
No full textPhotofermentative hydrogen production from olive mill wastewater by Rhodobacter sphaeroides O.U.001 was investigated under different regimes of illumination. The analysis included measurements of biomass accumulation, H 2-production, high-value bio-product accumulation (polyhydroxybutyrate and carotenoid) and measurements of the medium pH as a function of growth and productivity. Batch cultures were grown under continuous light (CL) or 12 h light/12 h dark (12L/12D) diurnal cycles. Growth under CL or 12L/12D cycles yielded about the same amount of biomass (0.5 g dry cell weight per L culture) and volume of H2 gas (50 ml H2 per L culture). On the other hand, 12L/12D cultures showed a pronounced lag in biomass and H2 accumulation. Advances described in the work would find application in lowering operational costs for hydrogen production by better management of the energy source and cheap feedstock utilization. Compare to CL, equivalent amount of hydrogen gas accumulation within shorter time interval denoted to have two times higher hydrogen production rate and light conversion efficiencies via diurnal cycles, which can yield 50% savings on consumed energy source. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved
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