396 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
Anılarla Prof. Dr.Yücel Kanpolat
No full textAnkara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2020This work is a student project of the Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.The History of Turkey course (HIST200) is a requirement for all Bilkent undergraduates. It is designed to encourage students to work in groups on projects concerning any topic of their choice that relates to the history of Turkey. It is designed as an interactive course with an emphasis on research and the objective of investigating events, chronologically short historical periods, as well as historic representations. Students from all departments prepare and present final projects for examination by a committee, with 10 projects chosen to receive awards.Includes bibliographical references (page 20).Prof. Dr. Yücel Kanpolat, Türkiye Bilimler Akademisi'nin (TÜBA) kuruluşunda büyük etkileri olan ve TÜBA'nın 2008-2012 yılları arasında başkanlığını yapmış bir beyin cerrahıdır. Tıp alanında yapmış olduğu araştırma ve konferanslarıyla dikkat çeken Yücel Kanpolat, kendi adını verdiği "Kanpolat CT-Elektrot Kiti (KCTE)" isimli ameliyat teknikleri ve cihazlarıyla da uluslararası üne kavuşmuştur. Eğitimin ön planda olduğu birçok projeye öncülük etmesi, Yücel Kanpolat'ın eğitime verdiği önemi göstermektedir. Yücel Kanpolat seçkin kişiliği ve akademik başarılarıyla çevresindekiler üzerinde iz bırakmış bir bilim insanıdır.Prof. Dr. Yucel Kanpolat is a neurosurgeon who had a great influence on the establishment of the Turkish Academy of Sciences (TÜBA) and was president of TÜBA between 2008 and 2012. Yucel Kanpolat, who attracted attention with his research and conferences in the field of medicine, has gained international fame with his surgical techniques and devices called "Kanpolat CT-Electrode Kit (KCTE)". The fact that he pioneered many projects where education is at the forefront shows the importance of Yucel Kanpolat to education. Yucel Kanpolat is a scientist who has left a mark on those around him with his distinguished personality and academic achievements.by İbrahim Mert Öztürk
The effect of different fiber reinforcement on the thermal and mechanical properties of autoclaved aerated concrete
No full textDemir, Ilhami/0000-0002-8230-4053; uzun, ibrahim/0000-0001-9725-2009In this study, the changes in thermal conductivity value, compression and flexural strength of autoclaved aerated concrete were investigated experimentally by adding polypropylene, carbon, basalt and glass fibers into the G3/05 and G4/06 class autoclaved aerated concrete used as wall elements in buildings and the commercial production of which is made. Fibers were substituted with the aggregate in autoclaved aerated concrete in equal amounts volumetrically. The produced samples were subjected to autoclaved cure as in non-fibrous autoclaved aerated concrete. As a result of the experimental study; it has been seen the thermal conductivity of fiber substituted autoclaved aerated concrete changes linearly with thermal conductivity of the substituted fibers and basalt fiber reinforced autoclaved aerated concrete gives the highest thermal conductivity. But, it has been seen that the best compression and flexural strength was given by the carbon fiber reinforced samples. (c) 2016 Elsevier Ltd. All rights reserved.Republic of Turkey Ministry of Science, Industry and Technology SAN-TEZ (Industry Theses) projects [00978.STZ.2011-2]This study is supported within the Republic of Turkey Ministry of Science, Industry and Technology SAN-TEZ (Industry Theses) projects. Project Number: 00978.STZ.2011-2
Artist Exposure Utilizing Multi-Language Communication Tools
No full textAbstract not present in the thesisDr. Kathryn Stam, adviser ; Dr. Ibrahim Yucel, adviserSUNY Polytechnic Institut
MATRIX HETEROGENEITY EFFECTS ON FLUID TRANSPORT IN POROUS MEDIUM: USING PERTURBATION THEORY
No full textIn this dissertation the processes of transport and reaction in heterogeneous porous medium is upscaled from pore scale to the scale of interest (e.g., core sample or reservoir scale) and new governing equations describing gas transport and reaction including the effects of heterogeneity is introduced.New upscaled equations for the first time described observations have been made earlier in the laboratory regarding storage and transport of gas in tight formations, such as gas trapping mechanism in gas release experiments and gas threshold effect in gas uptake, gas loading effects, adsorbed phase transport and nonlinearity effects of gas sorption kinetics on diffusive transports. New upscaled governing equations provide basis for further experimental works to quantify and distinguish effects of local heterogeneities on transport and storage in tight formations.\\Matrix heterogeneity effects on fluid transport in porous medium is investigated using an upscaling approach based on small perturbation theory.The approach allows us investigate the heterogeneity effects in spectral domain in the presence of non-equilibrium sorption with random partition coefficient. The work is motivated by the fact that (1) the porous medium is heterogeneous, i.e., it has a significant degree of spatial variability, and shows a complex structure at larger scales; (2) there always exists a lack of knowledge of the detailed local structure of these spatial variations; and (3) difficulties appear in obtaining sufficient data related to spatial and temporal distributions of mass and momentum variables, dictated by these large-scale variations. Here, the heterogeneity of the matrix is introduced using random porosity or permeability fields that holds the assumption of first and second orders of stationarity, i.e., constant mean and variance, and possess a well defined gaussian correlation function. All transport and kinetics parameters and dependent variables (e.g., free and adsorbed gas concentration) are also affected by the matrix heterogeneity and represented by their average and perturbations around the mean (arithmetic average) values.First, fundamental investigation is performed on shale and coal samples with simplified gas transport and adsorption kinetics. The former is simplified by considering the free phase transport only in the micro-pores and the latter by assuming linear non-equilibrium sorption kinetics. Substituting the perturbed variables and coefficients into the basic governing equations leads to the set of stochastic partial differential equations including mean and perturbation equations. Mean equations are essentially upscaled new governing equations that includes the auto- and cross-correlations between different perturbed quantities. The auto- and cross-correlations could be found solving perturbation equations in the Laplace-Fourier domain and back-transforming them to the time-space domain.It is found that upscaled deterministic gas mass balance includes new sink and source terms into the governing equations related to the local heterogeneity. Heterogeneity affects the gas transport and adsorption significantly through macro-transport and macro-kinetics terms. Macro-transport depends on Pclet number and interestingly persist at the diffusive limit, while micro-kinetics is related to the modified Thiele modulus. Heterogeneity retards gas release from the matrix and influences the ultimate gas recovery adversely. Both effects are directly related to the amount of initial gas adsorbed and the level of heterogeneity introduced to the system by the porosity variance. Next, the effects of heterogeneity on gas transport and adsorption in the presence of earlier ignored adsorbed phase transport and non-linear sorption kinetics investigated. The heterogenous porosity field leads to a significant improvement in adsorbed-phase transport when non-linear sorption kinetics is considered in very low permeability porous media. We theoretically observe new transport effects in the presence of adsorbed-phase. Furthermore, it is shown that the conventional Langmuir isotherms are not representing the sorption behavior of the gas correctly in the heterogeneous formations where the nonlinearity in sorption kinetics acts as trapping mechanism for adsorbed phase and surface diffusion decreases the time needed to reach the saturation pressure. Finally we investigated the effects of heterogeneity introduced by random permeability field on advection- reaction problem, where one step nonlinear reaction takes place. The results show rich nonlinear interplay between the existing mechanisms. The effect of heterogeneity on steady planar reaction wave is also investigated. It is revealed that the planar reaction wave is intrinsically unstable. The later is anticipated to expand due to development of non--uniform velocity field along the reaction wave
Seismic Intensity Maps for the Eastern Part of the North Anatolian Fault Zone (Turkey) Based on Recorded and Simulated Ground-Motion Data
No full textSeismic intensity maps are employed globally in the aftermaths of earthquakes for rapid response purposes. These maps involve correlations between intensity and peak ground-motion values. In this study, we focus on eastern sections of the North Anatolian fault zone (NAFZ). The eastern segments of the NAFZ are less investigated and have sparse seismic networks compared with western ones. In particular, we study Erzincan, which is a small city in eastern Turkey, located in the conjunction of three active faults: North Anatolian, North East Anatolian, and Ovacik faults. Erzincan city center is in a pull-apart basin underlain by soft sediments, which significantly amplify the ground motions. Combination of the tectonic and geological settings of the region have led to destructive earthquakes such as the 27 December 1939 (Ms = 8.0) and the 13 March 1992 (Mw = 6.6) events resulting in extensive losses. In this study, we initially perform ground-motion simulations for a set of scenario events as well as the 1992 Erzincan earthquake. We then use local relationships between Modified Mercalli Intensity (MMI) and Peak Ground Acceleration (PGA) as well as Peak Ground Velocity (PGV) to obtain the corresponding MMI values. We present our results in the form of synthetic intensity maps for the 1992 event and the scenario earthquakes
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
Heavy Metal Levels and Mineral Nutrient Status of Natural Walnut (Juglans regia L.) Populations in Kyrgyzstan: Nutritional Values of Kernels
No full textIn this study, mineral nutrient and heavy metal (Al, Ca, Cd, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn) contents of the walnut kernels and their co-located soil samples collected from the four different zones of natural walnut forests (Sary-Chelek, Arslanbap, and Kara-Alma in Jalal-Abad Region and Kara-Shoro in Osh Region) in Kyrgyzstan were investigated. The highest concentrations for all elements determined in the soilsamples were observed in the Sary-Chelek zone whereas the Arslanbap zone was found to be having the lowest concentrations except Fe and Zn. The highest concentrations in the kernels of walnut samples were found to be in the Sary-Chelek zone for Ca, Fe, K, Mg, and Zn; in the Kara-Shoro zone for Cu; in the Arslanbap zone for Mn; and in the Kara-Alma zone for Na whereas the lowest concentrations were found to be in the Arslanbap zone for Ca, Fe, K, Mg, Na, and Zn and in the Sary-Chelek zone for Cu and Mn, respectively. Also, the levels of Al, Cd, Ni, and Pb in kernel samples could not be detected by ICP-OES because their levels were lower than the threshold detection point (10g.kg(-1)). Additionally, our data indicated that the walnut kernels from Kyrgyzstan have higher values for RDA (recommended daily allowances) in comparison with the walnut kernels from other countries
A Laboratory Method for Estimation of Storage Capacity of Rock Samples Under Effective Stress
No full textFluid storage capacity measurement of core-plugs in the laboratory considers pore-volume as a function of effective stress. The latter is equal to (Applied Confining Pressure) ��� (Effective Stress Coefficient) x (Applied Pore Pressure). However, results are often reported as a function of difference in the applied pressures, because the effective stress coefficient is unknown and depends on the mechanical properties of the sample. This creates confusion during the interpretation of laboratory data and leads to added uncertainties in the analysis of storage. In this study I present a new laboratory method that allows simultaneous prediction of the sample pore volume, coefficient of isothermal pore compressibility, and the effective stress coefficient. These quantities are necessary to predict the fluid storage as a function of effective stress. The method requires two stages of gas (helium) uptake by the sample under confining pressure and pore pressure and measures pressure-volume data. Confining pressure is always kept larger than the equilibrium pore-pressure but their values at each stage can be changed arbitrarily. The method considers gas leakage adjustments at high pore pressure. The analysis is simple and includes simultaneous solutions of two algebraic equations including the measured pressure-volume data. The model is validated at zero stress. The reference volume predicted at zero stress matches with that measured independently using the standard helium porosimeter. For sandstone and shale, the pore compressibility is on average 1x10-5 psi-1 and the effective stress coefficient is slightly higher than unity. The effective stress coefficient in isotropic elastic porous materials is known as the Biot���s coefficient and the value we predict indicates the relationship between the bulk and grain volume moduli. Interestingly the effective stress coefficient predicted using shale samples rich in clays and organic matter is slightly higher than that for sandstone. This indicates other features of the sample such as fine-scale texture (laminations, and anisotropy, etc.) could come into play during the fluid storage measurements
Estimation of Biot's Coefficient in the Laboratory During Porosity Measurement Under Stress
No full textPoroelasticity is fundamental in the application of petroleum reservoir mechanics and production, wellbore stability, and hydraulic fracturing. Biot���s coefficient is key mechanical quantity for better understanding of the poroelastic behavior of the reservoir matrix under stress. Its measurement in the laboratory traditionally involves a mechanical setup, such as tri-axial compression test, and is time-consuming and costly. However, during the porosity and permeability measurements under stress, Biot���s coefficient is often assumed equal to one due to inherent difficulties in its measurement. In this study, a new analytical method is presented for estimating Biot���s coefficient of the rock samples in the laboratory during porosity measurement under stress. The approach can be extended to permeability measurements later. The technique used in this study requires helium uptake by the sample under predetermined confining pressure and pore pressure, and the application of Boyle���s law. It allows simultaneous prediction of the sample pore volume, the coefficient of isothermal pore compressibility, and the effective stress coefficient. The effective stress coefficient is a precursor of the Biot���s coefficient and influenced by the applied confining and pore pressure values. In this thesis we show a new graphical approach to predict the Biot���s coefficient from these laboratory quantities. The procedure is fast and can be performed in any reservoir petrophysics laboratory using the traditional Hassler core holder setup. Biot���s coefficient estimated for sandstone, carbonate, and shale samples are in a range between 0.46 and 1, which is commonly found in the literature performing the mechanical tests. The proposed method allows the determination of Biot���s coefficient using the conventional porosimeter set up without the need for sophisticated geomecanical tests
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