37 research outputs found
Developing authentic problems through lived experiences in nature
No full textThis study's main objective is to develop a theoretical and ontological basis for experimentation in contact with the real life, oriented to physics education. Physics is built upon the observation of nature, where our experience provides opportunity to deal with science in natural environment to those learners who have background in the very basics and essentials of physics. Physics in Nature course includes visiting and camping experiences situated in nature and organizing camp with educational purposes. The course has been integrated with indoor and outdoor settings interactively and the authentic problems, which have been taken from outdoor settings, have been brought into the class without well-defined structure (Ill-structured problems). Within the period of ten years, there were plethora of events and problems that would provide sufficient material for many researchers. Because every problem is an event and has a story. The philosophical event concept of Deleuze and Guattari has been used in the events of Physics in Nature courses. Post-qualitative research methodology has been used in order to put forward how to construct the relation between physics and nature and become the main problem in the physics in nature, thereby it has been the basis of the course and our academic researc
Digital Design Tools versus Architectural Representation and Design Approach
No full textThis study aims to investigate the relation between evolving graphic representations and due to new digital tools and how they affect architects\u92 approach to design process. In order to do this, Yap_ Magazine being published since 1973 in Turkey will be retrieved and data related to types of architectural design representation used will be recorded. The study will conclude with an evaluation of new representation means such as 3D render, other 3D digital products and diagrams and how they have influenced new approach to design
Geology, mineralogy and geochemistry of Pleistocene-Holocene deposits in the Ciftlik Basin (Nigde) (Central Turkey)
No full textThe Quaternary basin fills of the Ciftlik (Central Anatolia, Turkey), comprised of partially lithified sediments, and was studied from drill cores to reconstruct the paleoenvironment of deposition as well as the timing of sediment accumulation. Six lithofacies were identified as (A) clast-supported gravel, (B) horizontally-bedded sand, (C) alternating silt-mud, (D) diatomite, (E) disrupted mud, (F) and tuff. The siliciclastic and diatomite facies were interpreted as fluvial-lacustrine deposits associated with a volcanic area (tuff) while the disrupted mud were identified as two types of paleosols: Inceptisols and Andisols. These paleosols are mainly composed of opal A, opal CT, quartz, feldspar, and clay minerals such as smectite, illite, and chlorite. The diatomite is mainly composed of opal A, opal CT, quartz, feldspar and clay minerals such as smectite. Weathering of the tuff resulted in consumption of SiO2, Al2O3+ Fe2O3, TiO2 and K2O by precipitation of smectite +/- illite in paleosols. SiO2 was enriched in the lake water for the accumulation of diatomite. The fossil diatom assemblages were mainly comprised of benthic, cosmopolitan, eutrophic, alkalibiontic, and mesosaprophic forms, living in a lake with open drainage, shallow depth, nutrient-rich waters, and high alkalinity. However, water level, salinity, alkalinity, and permanent of the lake level changed during the deposition of the diatomite.Scientific and Technological Research Council of Turkey (TUBITAK) [104Y070]The author is greatly indebted to anonymous reviewers for their critical reviews and suggestions which improved the manuscript. I am also extremely grateful to Dr. MARTIN J. TIMMERMAN for his editorial comments and suggestions. Author sincerely thanks Prof. Dr. ELIZABETH GIERLOWSKI-KORDESCH (Department of Geological Sciences, Ohio University, USA) for her recommendations. This study was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK) within the framework of Project No. 104Y070. The author also wishes to thank Konya DSI Region Directory for providing drilling logs and core samples, and Dr. KLAUS WENDEROTH (Marburg University, Germany) for his help in identifying diatom species
Interactions of amino acids with adatoms(Ti, C, O) decorated graphene via effect of charging
No full textAs amino acids take an important role in biology, it is envisaged that understanding of their interactions with nanomaterials can resolve critical problems in the field of biomedicine. Graphene, single atom thick hexagonal lattice of sp(2)-bonded carbon, can be used for this purpose. The remarkable properties of graphene sheets could facilitate their application in areas like hydrogen technology, electronics, and sensing. In this work, we report density functional theory calculations of the adsorption of Histidine and Leucine molecules on pristine and decorated (Ti,C and O) graphene. The obtained binding energies of molecules on graphene surface are in good agreement previous studies. The chemisorption is achieved when Graphene is decorated with Ti and C. It is also shown that how modify structural properties of the molecules on pristine (Graphene by applied charging for the first time
Recursive algorithms for computational electromagnetics
No full textEfficient and fast recursive algorithms for both the spectral-domain and the space-domain solutions of the electromagnetic scattering problems have been developed. These algorithms have less than O(N\sp3) computational complexities and less than O(N\sp2) memory requirements for arbitrary geometries of scatterers clustered together. Although the algorithms are discussed as they are applied to the electromagnetic scattering problems, their domains of applicability can be extended to other types of electromagnetic problems (e.g., guidance, resonance, and radiation) and also to other types of field and wave equations (e.g., acoustic, elastic, and Schrodinger).The applications of these algorithms to the conducting strip and patch geometries have been demonstrated. Dielectric and magnetic materials can also be incorporated into conductor geometries. Due to the availability of the spectral Green's function, spectral-domain algorithms can efficiently handle geometries consisting of an arbitrary number of infinitely thin, conducting strips and flat patches of any shape embedded in arbitrarily layered media, in which the layers are infinitely large in the transverse directions. On the other hand, the space-domain algorithms presented in this dissertation are the recursive T-matrix algorithms, and due to the nature of the T-matrix formulations, they can easily handle geometries consisting of conductors, dielectrics and magnetic materials of finite size. Therefore, various problems defined in broad classes of geometries can be solved with these spectral-domain and space-domain algorithms.A recursive implementation of the method of moments is also presented. This algorithm is based on the principle of inversion of a general matrix by partitioning. Since it is a recursive algorithm, and since each recursion step requires O(N\sp2) operations, it can efficiently solve the problems in which one has to modify or perturb some parts of a main body whose solution is already known."When solving the electromagnetic scattering problem, these algorithms give the full-wave solution without having to make any approximations. Being computational algorithms, they are ""exact"" in the numerical sense. These algorithms also give the solution for all possible incident waves or ""right-hand sides"" at once, a property that is not shared by some other fast solution techniques such as the conjugate-gradient method. Furthermore, as opposed to some other formulation schemes such as the finite-element method, these algorithms naturally incorporate the radiation condition at infinity; therefore, they can handle geometries in unbounded media."Made available in DSpace on 2011-05-07T11:52:38Z (GMT). No. of bitstreams: 2
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Recurrence of Markov chain traces
No full textIt is shown that transient graphs for the simple random walk do not admit a nearest neighbor transient Markov chain (not necessarily a reversible one), that crosses all edges with positive probability, while there is such chain for the square grid . In particular, the -dimensional grid admits such a Markov chain only when . For we present a relevant example due to Gady Kozma, while the general statement for transient graphs is obtained by proving that for every transient irreducible Markov chain on a countable state space which admits a stationary measure, its trace is almost surely recurrent for simple random walk. The case that the Markov chain is reversible is due to Gurel-Gurevich, Lyons and the first named author (2007). We exploit recent results in potential theory of non-reversible Markov chains in order to extend their result to the non-reversible setup
Geology, mineralogy, and geochemistry of late Miocene paleosol and calcrete in the western part of the Central Anatolian Volcanic Province (CAVP), Turkey
No full textThe late Miocene was characterized by high global temperatures and partly to nearly complete desiccation of the Mediterranean Sea throughout the latter part of the Messinian age (the Messinian salinity crisis). The non-marine paleoenvironmental and paleoclimatic records from the Mediterranean area are highly limited in their spatial range. Late Miocene river flood-plain sediments in the Central Anatolian Volcanic Province (CAVP) of central Turkey consist of siliciclastic and pyroclastic sediments with paleosols and calcrete. Five lithofacies were identified as (A) massive conglomerate, (B) trough-cross-bedded sandstone, (C) massive mudstone, (D) disrupted mud, (E) and disrupted matrix-supported conglomerate. The paleosols were composed predominantly of smectite and illite with smaller amounts of feldspar, quartz, opal-A, pyroxene and amphibole, and the calcretes were composed mainly of calcite, with smaller amounts of feldspar, quartz and opal-A, and minor amounts of smectite, chlorite and illite. Authigenic clay minerals and micritic calcite coating on the detrital grains and soil peds and pendant cement in the calcrete and paleosol horizons were evidence of a vadose zone. In contrast, the large equant spar drusy mosaics were formed in phreatic environments. The weathering of ignimbrite and marble led to the depletion of SiO2, CaO, Al2O3, Fe2O3, TiO2, and K2O through the precipitation of smectite and illite in the paleosols, and CaO in the form of micrite and calcite in the calcrete horizons. Field observations, mineralogy, geochemistry and the results of delta O-18 and delta C-13 isotopic analysis reveal that alternating wet and dry periods resulted in an upward increase in precipitation of authigenic smectite and illite within the late Miocene sections, under the influence of geochemical and pH fluctuations in phreatic or vadose water within the river flood-plain paleoenvironment.Scientific and Technological Research Council of Turkey (TUBITAK) [104Y070]Author sincerely thanks Prof. Dr. Elizabeth Gierlowski-Kordesch (Department of Geological Sciences, Ohio University, USA) for her help in developing this manuscript and recommendations. This study was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK) within the framework of Project No. 104Y070
Paleosol and dolocrete associated clay mineral occurrences in siliciclastic red sediments of the Late Miocene Komisini Formation of the Tuzgolu basin in central Turkey
No full textThe Late Miocene was characterized by high global temperatures and partly to nearly complete desiccation of the Mediterranean Sea throughout the latter part of the Messinian age (the Messinian salinity crisis). The Late Miocene marine Mediterranean Sea area has been widely studied from different perspectives, but terrestrial paleoenvironmental and paleoclimatic records from the Mediterranean area are highly limited in their spatial range. To this end, the paleosols, dolocrete and fluvial sedimentary rocks of the Komisini Formation in the northwestern part of the Tuzgolu basin are described in detail. Six lithofacies were identified as (A) clast-supported gravel, (B) massive (pebbly) sandstone, (C) massive mudstone, (D) disrupted mud, (E) disrupted conglomerate, and (F) disrupted matrix-supported conglomerate. The siliciclastic facies were interpreted as braidplain, and the distal part of braidplain deposits is associated with an ophiolitic area while the disrupted mud and disrupted conglomerate were identified as three types of paleosols: Inceptisols, Aridisol and Vertisols. The calcretes occur in the paleosols in nodular, powder, and massive forms. Clay minerals include smectite, chlorite, palygorsldte, illite, and serpentine. Gypsum, smectite and chlorite are dominant minerals at the base and middle part of the section, whereas palygorskite and illite appear as the prevailing clay minerals in the upper sections. Smectite, illite and palygorskite precipitated in a vadose zone from strongly evaporated alkaline water rich in Si, Ca and Mg and poor in Al at increased temperatures and at an advanced stage of dolocrete and paleosol formation. K, Si, Mg, Al + Fe and Ca are required for smectite, illite, palygorskite and calcification. Given the increase in Ba, Cr, Ni and Co, these cations might have originated from ophiolite, carbonate and volcanic units. As a consequence, the vertical distribution of clay mineral types suggests the variations of paleoclimatic conditions during the deposition, and the relationships among the type of host rock, paleosol and dolocrete, which corresponds to nearly complete desiccation of the Mediterranean Sea. (C) 2016 Elsevier B.V. All rights reserved.Scientific and Technological Research Council of Turkey (TUBITAK) [104Y070]The author is greatly indebted to Professor Dr. Warren Huff, University of Cincinnati and anonymous reviewers for their critical reviews and suggestions which improved the manuscript. We are also extremely grateful to Professor Dr. Markus Egli for his editorial comments and suggestions. This study was financially supported by the Scientific and Technological Research Council of Turkey (TUBITAK) within the framework of Project No. 104Y070
The Continuity in Q of the Lupaş Q-Analogues of the Bernstein Operators
No full textThe Lupas q-analogue Rn,q of the Bernstein operator is the first known q-version of the Bernstein polynomials. It had been proposed by A. Lupas in 1987, but gained the popularity only 20 years later, when q-analogues of classical operators pertinent to the approximation theory became an area of intensive research. In this work, the continuity of operators Rn,q with respect to parameter q in the strong operator topology and in the uniform operator topology has been investigated. The cases when n is fixed and n -> infinity have been considered. (c) 2022 Elsevier Inc. All rights reserved.Recep Tayyip Erdogan UniversityThe authors express their sincere gratitude to the anonymous referees for their thorough reading of the manuscript and beneficial comments. The first-named author gratefully acknowledges the support of Recep Tayyip Erdogan University as this work was completed while she was on post doctoral leave at Atilim University
Geomorphology and pedogenic evolution of Quaternary calcretes in the northern Adana Basin of southern Turkey
No full textThe geomorphological settings of calcretes and column horizons in relation to soils were determined in the northern Adana Basin. Calcretes and column horizons are evidence of Pleistocene climatic fluctuations and specific geomorphological surfaces. Calcretes were determined to occur between the D2 and SY2, whereas column horizons occurred on D2, SY1, SY2, SA1 and SA2 geomorphological surfaces. Finally an evolutionary sequence of calcrete formation is presented. -Author
