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Unconventional resource's production under desorption-induced effects

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Petroleum 2016年第2期2卷 148-155页

作者： S.sina hosseini boosari umut aybar Mohammad O.eshkalak petroleum and natural gas engineering department at west virginia universityusa petroleum and geosystems engineering department at the university of texas at austinusa

Thousands of horizontal wells are drilled into the shale formations across the *** hydrocarbon production is substantially increased during past *** fact is accredited to advances obtained in hydraulic fracturing and pad drilling *** contribution of shale rock surface desorption to production is widely accepted and confirmed by laboratory and field ***,the subsequent changes in porosity and permeability due to desorption combined with hydraulic fracture closures caused by increased net effective rock stress state,have not been captured in current shale modeling and ***,it is essential to investigate the effects of induced permeability,porosity,and stress by desorption on ultimate hydrocarbon *** have developed a numerical model to study the effect of changes in porosity,permeability and compaction on four major *** formations considering their Langmuir isotherm desorption *** resources include;Marcellus,New Albany,Barnett and Haynesville ***,we introduced a model that is a physical transport of single-phase gas flow in shale porous ***,the governing equations are implemented into a one-dimensional numerical model and solved using a fully implicit solution *** is found that the natural gas production is substantially affected by desorption-induced porosity/permeability changes and *** paper provides valuable insights into accurate modeling of unconventional reservoirs that is more significant when an even small correction to the future production prediction can enormously contribute to the ***.

关键词： Shale desorption Unconventional reservoirs Porosity change Permeability chang e Desorption-induced effect

Carbon Dioxide Storage and Sequestration in Unconventional Shale Reservoirs

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Journal of Geoscience and Environment Protection 2015年第1期3卷 7-15页

作者： S. Sina Hosseini Boosari umut aybar Mohammad O. Eshkalak West Virginia University Morgantown WV USA Petroleum and Geosystems Engineering Department The University of Texas at Austin Austin TX USA

Carbon Dioxide (CO2) storage and sequestration in unconventional shale resources has been attracting interest since last couple of years due to the very unique characteristics of such formations have made them a feasible option for this object. Shale formations are found all around the world and the conventional assets are easily accessible, and also the huge move of operators toward developing unconventional reservoirs during past years leaves many of such formations ready for sequestering CO2. Today, the use of long horizontal wells that are drilled on a pad has the lowest amount of environmental footprint in which for storage and sequestration purpose also provides much more underground pore spaces available for CO2. In this paper we study the state of the art of the technology of CO2 storage and sequestration and provide different and fresh look for its complex phenomena from a mathematical modeling point of view. Moreover, we hope this study provides valuable insights into the use of depleted shale gas reservoirs for carbon sequestration, which as a result, a cleaner atmosphere will be achieved for the life of our next generations. Also, we present that the depleted shale gas reservoirs are very adequate for this purpose as they already have much of the infrastructure required to perform CO2 injection available in sites.

关键词： Carbon Dioxide Sequestration Shale Reservoirs Modeling and Simulation Clean Environment

Advances in the treatment of autism spectrum disorder:Wharton jelly mesenchymal stem cell transplantation

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World Journal of Methodology 2025年第1期15卷 72-79页

作者： Serdar Kabatas ErdinçCivelek Eyüp Can Savrunlu umut Karaaslan Özlem Yıldız Erdal Karaöz Department of Neurosurgery University of Health Sciences TurkeyGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Pediatric Allergy-Immunology Institute of Health Sciences Marmara UniversityIstanbul 34865Türkiye Center for Stem Cell&Gene Therapy Research and Practice University of Health Sciences TurkeyIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry University of Health SciencesGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Department of Child and Adolescent Psychiatry Kocaeli University Faculty of MedicineKocaeli 41001Türkiye Center for Regenerative Medicine and Stem Cell Research&Manufacturing Liv HospitalIstanbul 34340Türkiye Department of Histology and Embryology Istinye UniversityFaculty of MedicineIstanbul 34010Türkiye Center for Stem Cell and Tissue Engineering Research and Practice Istinye UniversityIstanbul 34340Türkiye

BACKGROUND Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder with multifaceted *** recent studies,neuroinflammation and immune dysregulation have come to the forefront in its *** are studies suggesting that stem cell therapy may be effective in the treatment of *** To evolve the landscape of ASD treatment,focusing on the potential benefits and safety of stem cell *** A detailed case report is presented,displaying the positive outcomes observed in a child who underwent intrathecal and intravenous Wharton’s jelly-derived mesenchymal stem cells(WJ-MSCs)transplantation combined with *** The study demonstrates a significant improvement in the child’s functional outcomes(Childhood Autism Rating Scale,Denver 2 Developmental Screening Test),especially in language and gross motor *** serious side effects were encountered during the 2-year *** The findings support the safety and effectiveness of WJ-MSC transplantation in managing ASD.

关键词： Autism spectrum disorder Neurorehabilitation Stem cell transplantation Wharton jelly mesenchymal stem cells Inflammation

Pragmatic model transformations for refactoring in Scilab/Xcos

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International Journal of Modeling, Simulation, and Scientific Computing 2016年第1期7卷 39-61页

作者： umut Durak German Aerospace Center(DLR)Institute of Flight Systems Lilienthalplatz 7 Braunschweig 38108Germany

Model-Based Development has become an industry wide standard *** an open source alternative,Scilab/Xcos is being widely employed as a hybrid dynamic systems modeling *** the increasing efficiency in implementation using graphical model development and code generation,the modeling and simulation community is struggling with assuring quality as well as maintainability and *** is defined as an evolutionary modernization activity where,most of the time,the structure of the artifact is changed to alter its quality characteristics,while keeping its behavior *** has been widely established as a technique for textual programming languages to improve the code structure and *** refactoring is also regarded as one of the key practices of model engineering,the methodologies and approaches for model refactoring are still under ***-Driven Modernization(ADM)has been introduced by the software engineering community as a model-based approach to software modernization,in which the implicit information that lies in software artifacts is extracted to models and model transformations are applied for modernization *** refactoring as a low level modernization task,the practices from ADM are ***,this paper proposes a model-based approach for model refactoring in order to come up with more efficient and effective model refactoring methodology that is accessible and extendable by *** other graphical modeling tools,Scilab/Xcos also possesses a formalized model specification conforming to its implicit *** than proposing another metamodel for knowledge extraction,this pragmatic approach proposes to conduct in place model-to-model transformations for refactoring employing the Scilab/Xcos model *** construct a structured model-based approach,the implicit Scilab/Xcos metamodel is explicitly presented utilizing ECORE as a *** a practical model

关键词： Model refactoring Scilab/Xcos model engineering model transformations

Jordan Derivations of Special Subrings of Matrix Rings

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Algebra Colloquium 2019年第1期26卷 83-92页

作者： umut Sayin Feride Kuzucuoglu Department of Mathematics Diizce University Konuralp 81620 Duzce Turkey Department of Mathematics Hacettepe University Beytepe 06800 Ankara Turkey

Let K be a 2-torsion free ring with identity and Rn(K, J) be the ring of all n × n matrices over K such that the entries on and above the main diagonal are elements of an ideal J of K. We describe all Jordan derivations of the matrix ring Rn(K, J) in this paper. The main result states that every Jordan derivation △ of Rn(K, J) is of the form △= D +Ω, where D is a derivation of Rn(K, J) and Ω is an extremal Jordan derivation of Rn(K, J).

关键词： matrix ring derivation Jordan derivation

Effect of Applied Current Density on Morphological and Structural Properties of Electrodeposited Fe-Cu Films

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Journal of Materials Science & Technology 2012年第11期28卷 1004-1009页

作者： umut Sarac M.Celalettin Baykul Department of Elementary Education Bart n University Department of Physics Eskisehir Osmangazi University

A detailed study has been carried out to investigate the effect of applied current density on the composition, crystallographic structure, grain size, and surface morphology of Fe-Cu films. X-ray diffraction （XRD） results show that the films consist of a mixture of face-centered cubic （fcc） Cu and body centered cubic （bcc） ^-Fe phases. The average crystalline size of both Fe and Cu particles decreases as the applied current density becomes more negative. Compositional analysis of Fe-Cu films indicates that the Fe content within the films increases with decreasing current density towards more negative values. Scanning electron microscopy （SEM） and atomic force microscopy （AFM） have been used to investigate the surface morphology of Fe-Cu films. It is observed that the surface morphology of the films changes from dendritic structure to a cauliflower structure as the applied current density becomes more negative. The surface roughness and grain size of the Fe-Cu films decrease with decreasing applied current density towards more negative values.

关键词： Electrodeposition Surface morphology Current density Grain size Composition

Quantitative Assessment of Remotely Sensed Global Surface Models Using Various Land Classes Produced from Landsat Data in Istanbul

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Chinese Geographical Science 2014年第3期24卷 307-316页

作者： Naci YASTIKLI umut G SEFERCIK Fatih ESIRTGEN Department of Geomatics Engineering Davutpasa CampusYildiz Technical University Department of Geomatics Engineering Bulent Ecevit University Mescioglu Engineering

Digital elevation model （DEM） is the most popular product for three-dimensional （3D） digital representation of bare Earth surface and can be produced by many techniques with different characteristics and ground sampling distances （GSD）. Space-borne opti- cal and synthetic aperture radar （SAR） imaging are two of the most preferred and modern techniques for DEM generation. Using them, global DEMs that cover almost entire Earth are produced with low cost and time saving processing. In this study, we aimed to assess the Satellite pour robservation de la Terre-5 （SPOT-5）, High Resolution Stereoscopic （HRS）, the Advanced Space-borne Thermal Emission and Reflection Radiometer （ASTER）, and the Shuttle Radar Topography Mission （SRTM） C-band global DEMs, produced with space-borne optical and SAR imaging. For the assessment, a reference DEM derived from 1 ： 1000 scaled digital photogrammetric maps was used. The study is performed in 100 km2 study area in Istanbul including various land classes such as open land, forest, built-up land, scrub and rough terrain obtained from Landsat data. The analyses were realized considering three vertical accuracy types as fundamental, supplemental, and consolidated, defined by national digital elevation program （NDEP） of USA. The results showed that, vertical accuracy of SRTM C-band DEM is better than optical models in all three accuracy types despite having the largest grid spacing. The result of SPOT-5 HRS DEM is very close by SRTM and superior in comparison with ASTER models.

关键词： digital elevation model (DEM) quantitative assessment Satellite pour l'observation de la Terre (SPOT) AdvancedSpace-borne Thermal Emission and Reflection Radiometer (ASTER) Shuttle Radar Topography Mission (SRTM)

Architectural typology of rural housing in Jaen,Peru

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Built Heritage 2022年第1期6卷 76-93页

作者： Floiran PeÑa-Huaman Diego Sifuentes-Rivera Cristian Yarasca-aybar Escuela Profesional de Arquitectura Universidad Peruana UnionLimaPeru

Jaén is one of the most important cities in the northern highlands of Peru due to its strategic location,commerce,and agricultural ***én has more than 185 thousand inhabitants,of which 48%live in rural areas,representing approximately 31 thousand rural *** research aims to determine the types of rural housing in Jaen,showing the possible variations and architectural manifestations due to the territorial and cultural characteristics.A field observation sheet has been used to study the rural dwellings of populated centres previously classified by altitudinal *** results show six architectural types of rural housing classified into two groups:"rural-residential housing"and"rural-agricultural housing"'These architectural types are generally located near water sources,within agricultural plots,and on *** architectural program is characterised by agricultural activity and family composition,which has grown over *** most commonly used construction systems are"pirca"and"quincha"',using natural materials such as"ichu"and *** is also evidence of cultural traditions rooted in the construction,such as"cambio de fuerzas""paracaico",and"minga".Therefore,the relevance of Jaen's rural housing is its geographical reading of the territory through the architectural and cultural legacy of these buildings.

关键词： Architectural typologies Peru Rural architecture Vernacular architecture Rural housing

Conformance testing of FMI calling sequence for simulation environments

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第2期10卷 156-183页

作者： Awad Mukbil umut Durak Sven Hartmann Clausthal University of Technology Department of Informatics Julius-Albert-Str.4 Clausthal-Zellefeld 38678Germany German Aerospace Center(DLR)Institute of Flight Systems Lilienthalplatz 7 Braunschweig 38108Germany

Exchanging simulation models is currently of utmost *** improve interoperability between suppliers and original equipment manufacturers(OEMs),the functional mock-up interface(FMI)is exchanged in a standard format called functional mock-up unit(FMU).Since its first release,many simulation tools took the initiative to support ***,since then,there have been many complaints stating that exchanging models via FMI does not work as stable as *** reason usually turned out to be the implementation of tool vendors that sometimes fail to comply with the standard *** paper introduces a methodology for testing FMI compliance of importing simulation tools using a set of reference *** standard defines the implementation of FMI functions calling sequence in a state ***,conformance testing(also called fault detection)from automata theory is utilized to produce reference FMUs based on the FMI state-machine.

关键词： FMI reference FMUs finite-state machine conformance testing