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Articles 6841 - 6870 of 10319
Full-Text Articles in Physical Sciences and Mathematics
Morphological And Optical Properties Of Vacuum Evaporated Zno Thin Films, Farzana Chowdhury, S. M. Firoz Hasan, M. Sahabul Alam
Morphological And Optical Properties Of Vacuum Evaporated Zno Thin Films, Farzana Chowdhury, S. M. Firoz Hasan, M. Sahabul Alam
Turkish Journal of Physics
ZnO thin films were deposited onto chemically and ultrasonically cleaned glass substrates by thermal evaporation in vacuum (\sim 10^{-6} mbar). The thickness of the films was measured by frequency shift of quartz crystal. The optical properties of the films have been ascertained by UV-VIS-NIR spectrophotometry in the photon wavelength range of 300--2500 nm. The effect of substrate temperature on the optical properties of the films has been investigated, where all film thickness was kept fixed at 100 \pm 10 nm. The optical transmittance spectra reveal a maximum transmittance of 88% at room temperature around photon wavelength of 2350 nm. Band …
Al-In-Hornblende Thermobarometry And Sr-Nd-O-Pb Isotopic Compositions Of The Early Miocene Alaçam Granite In Nw Anatolia (Turkey), Altuğ Hasözbek, Burhan Erdoğan, Muharrem Satir, Wolfgang Siebel, Erhan Akay, Güllü Deni̇z Doğan, Heinrich Taubald
Al-In-Hornblende Thermobarometry And Sr-Nd-O-Pb Isotopic Compositions Of The Early Miocene Alaçam Granite In Nw Anatolia (Turkey), Altuğ Hasözbek, Burhan Erdoğan, Muharrem Satir, Wolfgang Siebel, Erhan Akay, Güllü Deni̇z Doğan, Heinrich Taubald
Turkish Journal of Earth Sciences
During and after the closure of the Neo-Tethyan Ocean and progressive collision of the Tauride-Anatolide Platform with the Sakarya Continent, widespread magmatism occurred in NW Anatolia. This magmatism is manifested in a NW-trending belt along the northern border of the Menderes Massif. Due to the complex geodynamic setting of this region, the exact emplacement depth of the granitoids is still a matter of debate. Here we present Al-in-hornblende barometrical data and Sr-Nd-Pb isotope compositions of the Early Miocene Alaçam granite. The results imply a shallow emplacement depth of this granite (4.7±1.6 km) in contrast to previous studies which suggested emplacement …
Geochemical And Isotopic Constraints On Petrogenesis Of The Beypazarı Granitoid, Nw Ankara, Western Central Anatolia, Turkey, Yeşi̇m Yücel Öztürk, Cahi̇t Helvaci, Muharrem Satir
Geochemical And Isotopic Constraints On Petrogenesis Of The Beypazarı Granitoid, Nw Ankara, Western Central Anatolia, Turkey, Yeşi̇m Yücel Öztürk, Cahi̇t Helvaci, Muharrem Satir
Turkish Journal of Earth Sciences
The Upper Cretaceous Beypazarı granitoid of the western Ankara, Turkey, is composed of two different units, on the basis of petrography and geochemical composition; these are granodiorite and diorite. The granitoid is subalkaline, belonging to the high-K calc-alkaline I-type granite series, which have relatively low initial 87Sr/86Sr ratios (0.7053-0.7070). All these characteristics, combined with major, trace element geochemical data as well as mineralogical and textural evidence, reveal that the Beypazarı granitoid formed in a volcanic arc setting and was derived from a subduction-modified and metasomatized mantle-sourced magma, with its crustal and mantle components contaminated by interaction with the upper crust. …
Chromite-Hosted Silicate Melt Inclusions From Basalts In The Stravaj Complex, Southern Mirdita Ophiolite Belt (Albania), Izabella Havancsàk, Friedrich Koller, Jànos Kodolànyi, Csaba Szabò, Volker Höck, Kujtim Onuzi
Chromite-Hosted Silicate Melt Inclusions From Basalts In The Stravaj Complex, Southern Mirdita Ophiolite Belt (Albania), Izabella Havancsàk, Friedrich Koller, Jànos Kodolànyi, Csaba Szabò, Volker Höck, Kujtim Onuzi
Turkish Journal of Earth Sciences
The Stravaj ophiolite compex, part of the western Mirdita ophiolite belt in Albania, is located east of the Shpati massif, and west of the Shebenik massif. The Stravaj ophiolite sequence itself consist of MOR-related and subduction-related volcanic rocks (Hoeck et al. 2007) formed by pillow lavas and various dykes. The deeper units are formed by gabbros and plagioclase-bearing peridotites. The pillow lavas are intersected by basaltic dykes with a rather primitive composition. The studied basaltic dyke contains former relics of olivine, fresh spinel and clinopyroxene phenocrysts in a glassy groundmass. The silicate phases are strongly altered. The spinels appear as …
Aspects Of Final Disposal Of Radioactive Waste In Germany, Guido Bracke
Aspects Of Final Disposal Of Radioactive Waste In Germany, Guido Bracke
Turkish Journal of Earth Sciences
Safe disposal of radioactive waste is required in all countries using nuclear power, radioactive materials in medicine and in industry or research. This contribution presents an overview of the strategy of final disposal of radioactive waste and summarizes the procedure and present status in Germany. It is concluded that the safe disposal of radioactive waste is feasible but that the public demand for safety has to be met by applying a stepwise, transparent, and traceable development procedure for a repository in a safety case to obtain regulatory and public approval.
Ichnology Of The Miocene Güneyce Formation (Southwest Turkey): Oxygenation And Sedimentation Dynamics, Jan Kresten Nielsen, Muhi̇tti̇n Görmüş, Kubi̇lay Uysal, Süveyla Kanbur
Ichnology Of The Miocene Güneyce Formation (Southwest Turkey): Oxygenation And Sedimentation Dynamics, Jan Kresten Nielsen, Muhi̇tti̇n Görmüş, Kubi̇lay Uysal, Süveyla Kanbur
Turkish Journal of Earth Sciences
The Güneyce Formation is well exposed in the Lake District of southwestern Turkey. It was deposited in the early Miocene in the Neotethys ocean and contains a large variety of trace fossils. The following ichnotaxa were recognized: Chondrites intricatus, C. targionii, ?Cosmorhaphe isp., Helminthopsis isp., Helminthorhaphe flexuosa, Lorenzinia isp., Naviculichnium marginatum, ?Nereites isp., Ophiomorpha rudis, ?Phycosiphon incertum, Planolites beverleyensis, cf. Rhizocorallium isp. and Thalassinoides suevicus. There is a lateral trend from proximal turbiditic successions to distal low-oxygen shaly mudstone. Ophiomorpha rudis ichnosubfacies, Paleodictyon ichnosubfacies of the Nereites ichnofacies and Zoophycos ichnofacies were identified.
The Early−Middle Palaeozoic Oceanic Events Along The Southern European Margin: The Deli Jovan Ophiolite Massif (Ne Serbia) And Palaeo-Oceanic Zones Of The Great Caucasus, Guram Zakariadze, Stevan Karamata, Sergei Korikovsky, Aleksei Ariskin, Shota Adamia, Tamar Chkhotua, Sergei Sergeev, Natasha Solov'eva
The Early−Middle Palaeozoic Oceanic Events Along The Southern European Margin: The Deli Jovan Ophiolite Massif (Ne Serbia) And Palaeo-Oceanic Zones Of The Great Caucasus, Guram Zakariadze, Stevan Karamata, Sergei Korikovsky, Aleksei Ariskin, Shota Adamia, Tamar Chkhotua, Sergei Sergeev, Natasha Solov'eva
Turkish Journal of Earth Sciences
The paper deals with the Middle Palaeozoic oceanic events on the northern margin of the Eastern Mediterranean Hercynides. The Balkan-Carpathian Ophiolite Belt (BCO) and palaeo-oceanic zones of the Great Caucasus, all framing the East European Platform from the south, are correlated. The BCO palaeo-oceanic complex was widely thought to be a Late Precambrian-earliest Cambrian oceanic thrust sheet (563±5 Ma), a part of the South European Palaeo-oceanic Suture. The geochronological studies carried out on gabbroic series of the Deli Jovan Massif (BCO, NE Serbia), showed, however, that they are of much younger (Early Devonian) age: (a) Sm-Nd mineral isochron age of …
Palaeozoic Formations From Dobrogea And Pre-Dobrogea – An Overview, Antoneta Seghedi
Palaeozoic Formations From Dobrogea And Pre-Dobrogea – An Overview, Antoneta Seghedi
Turkish Journal of Earth Sciences
No abstract provided.
Tectonics Of The Strandja Massif, Nw Turkey: History Of A Long-Lived Arc At The Northern Margin Of Palaeo-Tethys, Boris Natalin, Gürsel Sunal, Muharrem Satir, Erkan Toraman
Tectonics Of The Strandja Massif, Nw Turkey: History Of A Long-Lived Arc At The Northern Margin Of Palaeo-Tethys, Boris Natalin, Gürsel Sunal, Muharrem Satir, Erkan Toraman
Turkish Journal of Earth Sciences
The Strandja Massif, Thrace Peninsula, NW Turkey, forms an important link between the Balkan Zone of Bulgaria, which is usually correlated with Variscan orogen in Central Europe, and the Pontides, where Cimmerian structures are the most prominent. The massif is composed of a Palaeozoic basement and a Triassic metasedimentary cover. The basement is made of various granite gneisses, paragneisses, and schists that are intruded by large plutons of monzonitic metagranites. Detrital zircon studies have revealed Ordovician (433 and 446 Ma) and Carboniferous (305 Ma) ages of the metasedimentary rocks. The isotopic age of the granite gneisses is 308-315 Ma (Carboniferous, …
Stable Isotope Composition Of Hydrothermally Altered Rocks And Hydrothermal Minerals At The Los Azufres Geothermal Field, Mexico, Ignacio S Torres Alvarado, Muharrem Satir, Daniel Perez Zarate, Peter Birkle
Stable Isotope Composition Of Hydrothermally Altered Rocks And Hydrothermal Minerals At The Los Azufres Geothermal Field, Mexico, Ignacio S Torres Alvarado, Muharrem Satir, Daniel Perez Zarate, Peter Birkle
Turkish Journal of Earth Sciences
The Los Azufres geothermal field is the second most important geothermal field for electricity production in Mexico, with a total installed capacity of 188 MW. Hydrothermal alteration studies have been an important tool for geothermal exploration and development of the field, but little attention has been given to the geochemical and isotopic characterization of hydrothermal minerals. \delta^1^8O, \delta^2H, and \delta^1^3C systematics at Los Azufres geothermal field were investigated using whole rock samples, as well as hydrothermal minerals separates, obtained from different depths in the wells Az-26 and Az-52. Most \delta^1^8O values reproduce well the present in-situ field temperatures and isotopic …
Variability Of Neogene Continental Climates In Northwest Europe - A Detailed Study Based On Microfloras, Torsten Utescher, Abdul Rahman Ashraf, Andreas Dreist, Karen Dybkjaer, Volker Mosbrugger, Jörg Pross, Volker Wilde
Variability Of Neogene Continental Climates In Northwest Europe - A Detailed Study Based On Microfloras, Torsten Utescher, Abdul Rahman Ashraf, Andreas Dreist, Karen Dybkjaer, Volker Mosbrugger, Jörg Pross, Volker Wilde
Turkish Journal of Earth Sciences
This study presents a detailed continental palaeoclimate record for the Neogene of Northwestern Europe. Palynomorph samples from continental to marginal marine deposits in 5 correlated sections from the Lower Rhine Basin (NW Germany) covering the time-span from Burdigalian to Zanclean are analysed. Independent time-control in the sections is provided by sequence stratigraphy. Based on 1470 microfloras 3 temperature (mean annual temperature, warm and cold month mean) and 4 precipitation variables (mean annual precipitation, mean monthly precipitation in the driest, wettest and warmest month) are quantified using the Coexistence Approach, a method employing climate requirements of Nearest Living Relatives of fossil …
Sedimentary Properties Of The Middle−Upper Eocene Formations In Çardak, Burdur And İncesu, Sw Turkey, Ezher Toker, Mehmet Serkan Akki̇raz, Fuzuli̇ Yağmurlu, Funda Akgün, Sefer Örçen
Sedimentary Properties Of The Middle−Upper Eocene Formations In Çardak, Burdur And İncesu, Sw Turkey, Ezher Toker, Mehmet Serkan Akki̇raz, Fuzuli̇ Yağmurlu, Funda Akgün, Sefer Örçen
Turkish Journal of Earth Sciences
The integration of sedimentological, palynological and palaeontological data in three different outcrops in SW Turkey provides a clearer understanding of the palaeoenvironments in an area between the Çardak-Dazkırı Basin and the Isparta region during the Middle-Late Eocene. In this study, the Çardak-Dazkırı (Başçeşme Formation), Burdur (Varsakyayla Formation) and Isparta (Kayıköy Formation) areas have been studied for facies and facies associations. These formations contain alluvial fan, fan delta, shelf and related marine deposits. Detailed field observations allowed 34 lithofacies and 10 facies associations to be identified. The palynomorph assemblages in the Başçeşme and Varsakyayla formations contain biostratigraphically important taxa such as …
Discovery Of A Mississippian Reef In Turkey: The Upper Viséan Microbial-Sponge-Bryozoan-Coral Bioherm From Kongul Yayla (Taurides, S Turkey), Julien Denayer, Markus Aretz
Discovery Of A Mississippian Reef In Turkey: The Upper Viséan Microbial-Sponge-Bryozoan-Coral Bioherm From Kongul Yayla (Taurides, S Turkey), Julien Denayer, Markus Aretz
Turkish Journal of Earth Sciences
For the first time, a Mississippian reef is described from Turkey. This microbial-sponge-bryozoan-coral bioherm has been discovered in the Central Taurides (South Turkey), at Kongul Yayla located between Hadim and Taşkent. The bioherm contains a rich and diversified fauna: sponges and rugose corals are of particular interest. The bioherm shows four main facies reflecting distinct growth stages from the base to the top: (1) the basal bioclastic beds, (2) the core facies formed of framestone comprising rugose corals, lithistid sponges, fistuliporid bryozoans and microbial boundstone, (3) the crest facies with large colonies of cerioid rugose corals and chaetetid sponges, and …
A New Late Holocene Eolianite Record From Altınkum Beach, North Cyprus, Ahmet Evren Ergi̇nal, Nafi̇ye Güneç Kiyak, Topçu Ahmet Ertek
A New Late Holocene Eolianite Record From Altınkum Beach, North Cyprus, Ahmet Evren Ergi̇nal, Nafi̇ye Güneç Kiyak, Topçu Ahmet Ertek
Turkish Journal of Earth Sciences
In this study, we investigated the main depositional characteristics and obtained Optically Stimulated Luminescence (OSL) ages of coastal eolianite on the north coast of Cyprus, where this occurrence had not previously been recorded. Based on EDX/SEM and XRD data and field observations, the studied eolianite that crops out between elevations of 1 m and 14 m a.s.l. is made up predominantly of quartz grains, most of which consist of medium- to fine-grained sand. The rock comprises aragonite, calcite and quartz with lesser amounts of bornite and hematite as accessory minerals. OSL ages indicated that the initial deposition of eolianite sands …
Late Palaeozoic To Cenozoic Evolution Of The Black Sea-Southern Eastern Europe Region: A View From The Russian Platform, Anatoly Nikishin, Peter Ziegler, Sergey Bolotov, Pavel Fokin
Late Palaeozoic To Cenozoic Evolution Of The Black Sea-Southern Eastern Europe Region: A View From The Russian Platform, Anatoly Nikishin, Peter Ziegler, Sergey Bolotov, Pavel Fokin
Turkish Journal of Earth Sciences
A synthesis of the Late Palaeozoic to Cenozoic evolution of the Black Sea region and the southern parts of the East European Platform (EEP) is presented. During Carboniferous to Early Permian times the Cordillera-type Euxinus Orogen evolved along the southern margin of the EEP in response to progressive closure of the Rheic and Palaeotethys oceans and the accretion of Gondwana-derived continental terranes. Permian development of the north-dipping Palaeotethys subduction system along the southern Pontides margin of these terranes was accompanied by important compressional intraplate deformation on the EEP. The Mesozoic to Palaeogene evolution of the southern parts of the EEP, …
Geology And Hydrocarbon Systems In The Western Black Sea, Georgi Georgiev
Geology And Hydrocarbon Systems In The Western Black Sea, Georgi Georgiev
Turkish Journal of Earth Sciences
This paper presents the author's integrated regional studies during the last decade. The main purpose is to present an overall understanding of the geological structure, sedimentary basins and hydrocarbon systems of the whole Western Black Sea Zone (WBSZ). This study is based on original data from boreholes, seismic and gravity-magnetic surveys and hydrocarbon accumulations. Many geophysical borehole data obtained for WBSZ during the last 3-4 decades were interpreted mostly at a national level using different approaches, terminology and nomenclature for the same or similar lithostratigraphic and tectonic units. Therefore, a unified approach to interpretation of borehole-seismic data and correlation of …
Cenozoic Volcanism Of The Caucasian Mobile Belt In Georgia, Its Geological-Petrological Peculiarities And Geodynamic Conditions, Bezhan Tutberidze
Cenozoic Volcanism Of The Caucasian Mobile Belt In Georgia, Its Geological-Petrological Peculiarities And Geodynamic Conditions, Bezhan Tutberidze
Turkish Journal of Earth Sciences
The Caucasian mobile belt is situated in the area of Late Cenozoic collision of the large Afro-Arabian and Eurasian lithospheric plates. Extensive volcanic activity in the Georgian part of the Caucasian mobile belt took place during the Late Miocene-Holocene. Five volcanic regions have been identified in Georgia; each of them reveals in a greater or lesser degree similarity of tectonic and magmatic processes. Volcanic products are represented by basaltic, doleritic, andesitic basaltic, andesitic dacitic, rhyolitic lavas and their pyroclastics with andesites and dacites prevailing. Using petrochemical and geochemical data the volcanics can be divided into two main rock groups: calc-alkaline …
Slab Waveguide Sensor Based On Amplified Phase Change Due To Multiple Total Internal Reflections, Sofyan A. Taya, Taher M. El-Agez
Slab Waveguide Sensor Based On Amplified Phase Change Due To Multiple Total Internal Reflections, Sofyan A. Taya, Taher M. El-Agez
Turkish Journal of Physics
We present theoretically an optical slab waveguide sensor based on amplified phase change due to multiple total internal reflections (TIRs). Compared with the conventional waveguide sensors, the proposed approach provides higher sensitivity. In this sensor, we adopt the change in the ellipsometric total phase change \Delta as the measuring probe of changes in the refractive index (RI) of the cladding. The change in \Delta is calculated for large number of alternating total reflections. Numerical calculations show that \Delta is strongly dependent on the RI variations of the cladding. Moreover, theoretical simulations show that the resolution of this sensor is predicted …
Coupled-Channels Analysis Of K^+ Scattering From ^6li, Ahmed Aly Ebrahim
Coupled-Channels Analysis Of K^+ Scattering From ^6li, Ahmed Aly Ebrahim
Turkish Journal of Physics
Differential cross sections for the elastic and inelastic scattering of K^+ at 715 MeV/c from ^6Li are analysed by applying the Watanabe superposition model to the real potential with a phenomenological imaginary potential. The optical potential of ^6Li is calculated in terms of alpha-particle and deuteron or triton and helion optical potentials. The calculated cross sections are consistent with the triton-helion model.
Full Polar Optical Phonon States And Dispersive Spectra Of A Wurtzite Gan/Aln Rectangular Quantum Wire, Li Zhang
Turkish Journal of Physics
Within the framework of the dielectric continuum model and Loudon's uniaxial crystal model, the full polar optical phonon modes including the quasi-confined (QC) modes, the propagating (PR) modes, the half-space (HS) modes, and the interface optical (IO) modes in a quasi-one-dimensional (Q1D) wurtzite rectangular quantum wire (QWR) structure are deduced and analyzed. The analytical phonon states, their dispersion equations and polar polarization eigenvectors are derived. Numerical calculation of dispersive spectra for these modes is performed on a wurtzite GaN/AlN rectangular QWR. The behavior of the QC mode reducing to the IO mode is observed clearly in the dispersive curves of …
Groupoids, Imaginaries And Internal Covers, Ehud Hrushovski
Groupoids, Imaginaries And Internal Covers, Ehud Hrushovski
Turkish Journal of Mathematics
Let T be a first-order theory. A correspondence is established between internal covers of models of T and definable groupoids within T. We also consider amalgamations of independent diagrams of algebraically closed substructures, and find strong relation between covers, uniqueness for 3-amalgamation, existence of 4-amalgamation, imaginaries of T^\si, and definable groupoids. As a corollary, we describe the imaginary elements of families of finite-dimensional vector spaces over pseudo-finite fields.
Invariants Of Symmetric Algebras Associated To Graphs, Maurizio Imbesi, Monica La Barbiera
Invariants Of Symmetric Algebras Associated To Graphs, Maurizio Imbesi, Monica La Barbiera
Turkish Journal of Mathematics
In this work we deal with the symmetric algebra of monomial ideals that arise from graphs, the edge ideals. The notion of s-sequence is explored for such ideals in order to compute standard algebraic invariants of their symmetric algebra in terms of the corresponding invariants of special quotients of the polynomial ring related to the graphs.
Study And Control Of 5-Level Pwm Rectifier-5-Level Npc Active Power Filter Cascade Using Feedback Control And Redundant Vectors, Thameur Abdelkrim, El Madjid Berkouk, Karima Benamrane, Tarak Benslimane
Study And Control Of 5-Level Pwm Rectifier-5-Level Npc Active Power Filter Cascade Using Feedback Control And Redundant Vectors, Thameur Abdelkrim, El Madjid Berkouk, Karima Benamrane, Tarak Benslimane
Turkish Journal of Electrical Engineering and Computer Sciences
The purpose of this paper is to develop a control and regulation method for the input DC voltages of a 5-level neutral point clamping (NPC) active power filter (APF). This APF is applied for the enhancement of medium-voltage network power quality by compensation of harmonic currents produced by an induction motor speed variator. In the first part, the authors present a topology of a 5-level NPC voltage source inverter and its simplified space vector pulse width modulation (SVPWM) control strategy. In the second part, the control strategy of the 5-level pulse width modulation current rectifier is presented. In the third …
The Kemer Metamorphic Complex (Nw Turkey): A Subducted Continental Margin Of The Sakarya Zone, Mesut Aygül, Gülteki̇n Topuz, Aral Okay, Muharrem Satir, Hans Peter Meyer
The Kemer Metamorphic Complex (Nw Turkey): A Subducted Continental Margin Of The Sakarya Zone, Mesut Aygül, Gülteki̇n Topuz, Aral Okay, Muharrem Satir, Hans Peter Meyer
Turkish Journal of Earth Sciences
High-pressure and ultrahigh-pressure metamorphic rocks crop out widely in the northern Aegean. In many instances their ages and tectonic setting are poorly constrained. Here we report newly discovered high-pressure rocks of continental crustal origin and of Late Cretaceous age southwest of the Marmara Sea. They occur at the contact between the Rhodope-Strandja Zone in the north and the Sakarya Zone in the south. The Kemer Metamorphic Complex is composed mainly of mica schist, calcschist and marble with minor metabasite and serpentinite. The mica schists contain garnet, phengite (3.30-3.44 c.p.f.u), (±) paragonite, albite, epidote, calcite, chlorite and titanite. The high-pressure metamorphic …
An Algorithm For The Detection And Analysis Of Arud Meter In Diwan Poetry, Atakan Kurt, Mehmet Kara
An Algorithm For The Detection And Analysis Of Arud Meter In Diwan Poetry, Atakan Kurt, Mehmet Kara
Turkish Journal of Electrical Engineering and Computer Sciences
Diwan poetry is an important branch of classical Turkish literature (or Ottoman literature) that uses arud meter (wazn AR\footnote{Denotes an Arabic word.} or bahr AR, ölçü TR\footnote{Denotes a Turkish word.}). The teaching of classical poetry in high schools and in literature departments in universities requires an understanding of this meter. Arud is also used in Arabic, Persian, Urdu, and other eastern languages. Determining the arud meter of poems written in the Ottoman language (Osmanlıca TR) is a difficult and tedious task for those who study poetry. In this paper, we focus on the computerized analysis of arud meter. We present …
Porosity-Permeability And Textural Parameters Of The Palaeogene Forearc Sedimentary Fill On Lemnos Island, Ne Greece, Angelos Maravelis, Avraam Zelilidis
Porosity-Permeability And Textural Parameters Of The Palaeogene Forearc Sedimentary Fill On Lemnos Island, Ne Greece, Angelos Maravelis, Avraam Zelilidis
Turkish Journal of Earth Sciences
The Palaeogene forearc sedimentary fill on Lemnos Island, NE Greece, was examined to determine reservoir characteristics and textural parameters. During this time interval the studied area was the site of accumulation of submarine fans that underlie shelf deposits, with tectonic activity responsible for the shallowing upward trend. Turbidites were deposited in both inner (slope fan facies) and outer parts (basin floor fan facies) of the submarine fan system and consist of alternating sandstone and mudstone beds. Sandstones occur in both complete and incomplete Bouma sequences while shelf deposits have been interpreted as storm-surge deposits on the deeper parts of shelves. …
Neotectonic Characteristics Of The İnönü-Eskişehir Fault System In The Kaymaz (Eskişehir) Region: Influence On The Development Of The Mahmudiye-Çifteler-Emirdağ Basin, Azad Selçuk, Yaşar Ergün Gökten
Neotectonic Characteristics Of The İnönü-Eskişehir Fault System In The Kaymaz (Eskişehir) Region: Influence On The Development Of The Mahmudiye-Çifteler-Emirdağ Basin, Azad Selçuk, Yaşar Ergün Gökten
Turkish Journal of Earth Sciences
The İnönü-Eskişehir Fault System (İEFS) is a NW- to WNW-trending zone of active deformation about 15-25 km wide, 400 km long and characterized predominatly by strike-slip faulting. In this study, the Yörükkaracaören (SE of Eskişehir)-Sivrihisar section of the İEFS was investigated. The system consists of three fault zones, namely the Alpu Fault Zone (AFZ), the Eskişehir Fault Zone (EFZ) and the Orhaniye Fault Zone (OFZ) in the study area. The EFZ is made up mostly of N30°W-trending right-lateral strike-slip fault segments with normal components. However, the AFZ and OFZ are composed of E-W-trending normal and NE- to NW-trending strike-slip fault …
Reduction Of Torque Ripple In Dtc For Induction Motor Using Input-Output Feedback Linearization, Sebti Belkacem, Farid Naceri, Rachid Abdessemed
Reduction Of Torque Ripple In Dtc For Induction Motor Using Input-Output Feedback Linearization, Sebti Belkacem, Farid Naceri, Rachid Abdessemed
Turkish Journal of Electrical Engineering and Computer Sciences
Direct torque control (DTC) is known to produce fast responses and robust control in AC adjustable-speed drives. However, in the steady-state operation, notable torque, flux, and current pulsations occur. In this paper, nonlinear DTC of induction motor drives is presented based on a space vector pulse-width modulation scheme combined with the input-output feedback linearization technique. The variation of stator and rotor resistance due to changes in temperature or frequency deteriorates the performance of the DTC controller by introducing errors in the estimated flux linkage and the electromagnetic torque. This approach will not be suitable for high power drives such as …
The Composition Dependence Of The Optical Band Gap In Ge Doped Se-Te Glassy Alloy, Mainika Kapoor, Nagesh Thakur
The Composition Dependence Of The Optical Band Gap In Ge Doped Se-Te Glassy Alloy, Mainika Kapoor, Nagesh Thakur
Turkish Journal of Physics
Bulk glasses with the chemical composition (Se_{80}Te_{20})_{100-x}Ge_x (x = 0, 2, 4, 6) have been prepared from high purity constituent elements. Fragments of the bulk glasses are used to deposit thin films by vacuum thermal evaporation and compositional dependence of the optical and physical properties have been studied. It has been found that optical absorption is due to indirect transition and the optical band gap E_g increases with increasing Ge content in Se-Te glassy alloy. The relationship between the E_g and chemical composition is discussed in terms of cohesive energy and co-ordination number.
Structural And Optical Studies On La Doped Cds Nanocrystalline Films, Kusumanjali Dehmukh, Mimi Mukherjee, Shashi Bhushan
Structural And Optical Studies On La Doped Cds Nanocrystalline Films, Kusumanjali Dehmukh, Mimi Mukherjee, Shashi Bhushan
Turkish Journal of Physics
This paper reports the synthesis of pure and lanthanum (La) doped nanocrystalline CdS semiconducting films on the glass substrate by means of chemical bath deposition (CBD), with Cd(CH_3COO)_2 as Cadmium (Cd) ion source, (NH_2)_2CS as sulphur (S) ion source and Thioglycerol as capping agent. Long, rod like structures is observed in SEM micrographs of the films. XRD studies show the existence of both hexagonal and cubic phases. Increase in FWHM is observed for smaller particle due to nanocrystalline effect. UV-VIS absorption studies show shift of absorption edge towards lower wavelength side. Corresponding change in band gap energy results in shift …