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Frequency of hepatic steatosis and its association with the pneumonia severity score on chest computed tomography in adult COVID-19 patients

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World Journal of Critical Care Medicine 2021年第3期10卷 47-57页

作者： mehmet Tahtabasi Tugrul Hosbul Ergin Karaman Yasin Akin Nihat Kilicaslan mehmet gezer Fatih Sahiner Department of Radiology University of Health ScienceMehmet Akif Inan Education and Research HospitalSanliurfa 63000Turkey Department of Medical Microbiology Gulhane Medical FacultyUniversity of Health SciencesAnkara 06100Turkey

BACKGROUND Recent studies of the coronavirus disease 2019(COVID-19)demonstrated that obesity is significantly associated with increased disease severity,clinical outcome,and *** association between hepatic steatosis,which frequently accompanies obesity,and the pneumonia severity score(PSS)evaluated on computed tomography(CT),and the prevalence of steatosis in patients with COVID-19 remains to be *** To assess the frequency of hepatic steatosis in the chest CT of COVID-19 patients and its association with the *** The chest CT images of 485 patients who were admitted to the emergency department with suspected COVID-19 were retrospectively *** patients were divided into two groups as COVID-19-positive[CT-and reverse transcriptase-polymerase chain reaction(RT-PCR)-positive]and controls(CT-and RT-PCR-negative).The CT images of both groups were evaluated for PSS as the ratio of the volume of involved lung parenchyma to the total lung *** steatosis was defined as a liver attenuation value of≤40 Hounsfield units(HU).RESULTS Of the 485 patients,56.5%(n=274)were defined as the COVID-19-positive group and 43.5%(n=211)as the control *** average age of the COVID-19-positive group was significantly higher than that of the control group(50.9±10.9 years vs 40.4±12.3 years,P<0.001).The frequency of hepatic steatosis in the positive group was significantly higher compared with the control group(40.9%vs 19.4%,P<0.001).The average hepatic attenuation values were significantly lower in the positive group compared with the control group(45.7±11.4 HU vs 53.9±15.9 HU,P<0.001).Logistic regression analysis showed that after adjusting for age,hypertension,diabetes mellitus,overweight,and obesity there was almost a 2.2 times greater odds of hepatic steatosis in the COVID-19-positive group than in the controls(odds ratio 2.187;95%confidence interval:1.336-3.580,P<0.001).CONCLUSION The prevalence of hepatic steatosis was significantly highe

关键词： Liver Steatosis COVID-19 Computed tomography Pneumonia severity score

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A Study on the Second Order Tangent Bundles over Bi-K■hlerian Manifolds

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Chinese Annals of Mathematics,Series B 2024年第5期45卷 777-804页

作者： Nour Elhouda DJAA Aydin gezer Abderrahim ZAGANE Relizane University Faculty of Sciences and Technology Department of Mathematics Ataturk University Faculty of Science Department of Mathematics

Abstract This paper aims to study the Berger type deformed Sasaki metric gBSon the second order tangent bundle T2M over a bi-K■hlerian manifold *** authors firstly find the Levi-Civita connection of the Berger type deformed Sasaki metric gBSand calculate all forms of Riemannian curvature tensors of this ***,they study geodesics on the second order tangent bundle T2M and bi-unit second order tangent bundle T21,1M,and characterize a geodesic of the bi-unit second order tangent bundle in terms of geodesic curvatures of its projection to the ***,they present some conditions for a sectionσ:M→T2M to be harmonic and study the harmonicity of the different canonical projections and inclusions of (T2M,gBS).Moreover,they search the harmonicity of the Berger type deformed Sasaki metric gBSand the Sasaki metric gSwith respect to each other.

关键词： Berger type deformed Sasaki metric Bi-Kählerian structure Geodesics Harmonicity Riemannian curvature tensor Second order tangent bundle

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On the Geometry of the(1,1)-Tensor Bundle with Sasaki Type Metric

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Chinese Annals of Mathematics,Series B 2011年第3期32卷 369-386页

作者： Arif SALIMOV Aydin gezer Department of Mathematics Faculty of ScienceAtaturk University

Curvature properties are studied for the Sasaki metric on the （1, 1） tensor bundle of a Riemannian manifold. As an application, examples of almost para-Nordenian and para-Kahler-Nordenian B-metrics are constructed on the （1, 1） tensor bundle by looking at the Sasaki metric. Also, with respect to the para-Nordenian B-structure, paraholomorphic conditions for the complete lifts of vector fields are analyzed.

关键词： Tensor bundle Sasaki metric Vertical and horizontal lift B-manifold

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Notes concerning Codazzi pairs on almost anti-Hermitian manifolds

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Applied Mathematics(A Journal of Chinese Universities) 2023年第2期38卷 223-234页

作者： Aydin gezer Hasan Cakicioglu Department of Mathematics Ataturk University25240Erzurum-Turkey

Let∇be a linear connection on a 2n-dimensional almost anti-Hermitian manifold M equipped with an almost complex structure J,a pseudo-Riemannian metric g and the twin metric G=g◦*** this paper,we first introduce three types of conjugate connections of linear connections relative to g,G and *** obtain a simple relation among curvature tensors of these conjugate *** clarify the relations of these conjugate connections,we prove a result stating that conjugations along with an identity operation together act as a Klein group,which is analogue to the known result for the Hermitian case in[2].Secondly,we give some results exhibiting occurrences of Codazzi pairs which generalize parallelism relative to∇.Under the assumption that(∇,J)being a Codazzi pair,we derive a necessary and sufficient condition the almost anti-Hermitian manifold(M,J,g,G)is an anti-K¨ahler relative to a torsion-free linear connection∇.Finally,we investigate statistical structures on M under∇(∇is a J−parallel torsion-free connection).

关键词： anti-Kahler structure Codazzi pair conjugate connection twin metric statistical structure

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Geometry of the Second-Order Tangent Bundles of Riemannian Manifolds

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Chinese Annals of Mathematics,Series B 2017年第4期38卷 985-998页

作者： Aydin gezer Abdullah MAGDEN Department of Mathematics Ataturk University Erzurum 25240 Turkey.

Let （M, g） be an n-dimensional Riemannian manifold and T2M be its second- order tangent bundle equipped with a lift metric g. In this paper, first, the authors con- struct some Riemannian almost product structures on （T2M, g） and present some results concerning these structures. Then, they investigate the curvature properties of （T2M, g）. Finally, they study the properties of two metric connections with nonvanishing torsion on （T2M, g： The//-lift of the Levi-Civita connection of g to TaM, and the product conjugate connection defined by the Levi-Civita connection of g and an almost product structure.

关键词： Almost product structure Killing vector field Metric connection Rie-mannian metric Second-order tangent bundle

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NOTES ON THE RESCALED SASAKI TYPE METRIC ON THE COTANGENT BUNDLE

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Acta Mathematica Scientia 2014年第1期34卷 162-174页

作者： Aydin gezer Murat ALTUNBAS Department of Mathematics Faculty of Science Ataturk University Department of Mathematics Faculty of Science and Art Erzincan University

Let （M, g） be an n-dimensional Riemannian manifold and T＊M be its cotan-gent bundle equipped with the rescaled Sasaki type metric. In this paper, we firstly study the paraholomorphy property of the rescaled Sasaki type metric by using some compati-ble paracomplex structures on T＊M. Second, we construct locally decomposable Golden Riemannian structures on T＊M . Finally we investigate curvature properties of T＊M .

关键词： almost paracomplex structure cotangent bundle Golden structure paraholomorphic tensor field Riemannian curvature tensor scalar curvature

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On Affine Connections Induced on the(1,1)-Tensor Bundle

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Chinese Annals of Mathematics,Series B 2018年第4期39卷 683-694页

作者： Murat ALTUNBAS Aydin gezer Department of Mathematics Erzincan University Department of Mathematics Ataturk University

Let M be an n-dimensional differentiable manifold with an affine connection without torsion and T_1~1(M) its(1, 1)-tensor bundle. In this paper, the authors define a new affine connection on T_1~1(M) called the intermediate lift connection, which lies somewhere between the complete lift connection and horizontal lift connection. Properties of this intermediate lift connection are studied. Finally, they consider an affine connection induced from this intermediate lift connection on a cross-section σ_ξ(M) of T_1~1(M) defined by a(1, 1)-tensor field ξ and present some of its properties.

关键词： Connections Geodesic Semi-symmetry type condition Sasaki metric Tensor bundle

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Distinguished Connections on Finsler Algebroids

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Chinese Annals of Mathematics,Series B 2021年第1期42卷 41-68页

作者： Esmaeil PEYGHAN Aydin gezer Inci GULTEKIN Department of Mathematics Faculty of ScienceArak UniversityArak38156-8-8349Iran Ataturk University Faculty of ScienceDepartment of Mathematics25240ErzurumTurkey

Considering the prolongation of a Lie algebroid,the authors introduce Finsler algebroids and present important geometric objects on these *** endomorphisms like conservative and Barthel,Cartan tensor and some distingu... 详细信息

关键词： Chern-Rund connection Distinguished connections Finsler algebroid Hashiguchi connection Lie algebroid

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Effects of wood species and retention levels on removal of copper,chromium,and arsenic from CCA-treated wood using sodium hypochlorite

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Journal of Forestry Research 2016年第2期27卷 433-442页

作者： Engin Derya gezer Paul A.Cooper Department of Forest Industry Engineering Karadeniz Technical University61080 TrabzonTurkey Faculty of Forestry University of Toronto33 Willcocks St.TorontoON M5S 3B3Canada

Chemical extraction, bioremediation, and electrodialytic processes have been extensively studied for removal of copper, chromium, and arsenic from wood treated with chromated copper arsenate （CCA）. However, one problem has not been addressed： the effects of wood species and retention levels on remediation efficiency. The objectives of this study were to investigate the effects of wood species and retention levels on removal of copper, chromium, and arsenic from CCA-treated wood samples using sodium hypochlorite. Our results showed that sodium hypochlorite （NaOC1） was very effective for removal of copper, chromium, and arsenic from CCA-C treated milled wood samples for all three species used in this study. The Cu, Cr, and As extraction efficiencies for red pine were 95 % Cu, 97 % Cr and 94 % As, for maple were 95 % Cu, 97 % Cr, and 98 % As at 4.0 kg m-3 retention levels, and for aspen were 95 % Cu, 92% Cr, and 91% As at 9.6 kg m-3 retention level, respectively. However, the results showed that wood species and initial retention levels of CCA-treated wood products played very impor- tant roles in terms of removal of Cu, Cr, and As.

关键词： Chromated copper arsenate (CCA) Remediation Remediation efficiency Wood species Retention level

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土耳其语与汉语中含“牛”成语的对比

土耳其语与汉语中含“牛”成语的对比

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作者：哈桑（gezer HASAN MERT）华东师范大学

学位级别：硕士

成语在适当使用时会使沟通变得生动而高效,但当交谈双方中的任何一方不能够很好理解对方使用的成语的意义时,交流便会受阻。作为一名土耳其的汉语学习者,笔者感触尤深。基于此,本研究围绕土耳其语和汉语两种语言中含“牛”字的成语展开... 详细信息

成语在适当使用时会使沟通变得生动而高效,但当交谈双方中的任何一方不能够很好理解对方使用的成语的意义时,交流便会受阻。作为一名土耳其的汉语学习者,笔者感触尤深。基于此,本研究围绕土耳其语和汉语两种语言中含“牛”字的成语展开。本文共涉及包括十七个土耳其语成语和三十八个汉语成语在内的共计五十五个成语条目。土耳其语成语的标准解释参见《?rnekleriyle Büyük Deyimler S?zlü?ü》(成语例句大辞典),针对汉语成语,则使用了《汉语成语分类大辞典》。本研究是考察土耳其语和汉语含“牛”字成语的异同的一项跨语言研究。为达研究目的,本研究采用描写与解释相结合的方法、对比分析法和半结构式访谈法等定性研究方法。在研究中,首先通过比对分析该含有“牛”字的成语在词典中的释义及其在语用层面的具体用法和其所烘托的情绪气氛,而后辅以对上述成语的分析比较,冀图由此揭示两种语言的相同与差异所在,并试图挖掘解释这些异同的原因。访谈旨在考察以土耳其语为母语的汉语学习者对汉语含“牛”成语认知情况。研究由学习者是否能理解“牛”字成语的含义的分析切入,在其理解出现偏差的情况下,对有可能阻碍学习者对该成语理解的因素进行了考察;在其理解未出现偏差的情况下,学习者能否母语中相对应的表达便成为了考察重点。对于已经具备了对于目的语言知识完整体系化了解的学习者,考察重点位于对于成语基于情境考量的具体正确使用上。研究发现,两种语言中含“牛”字的成语在语义、语用方面并不具有相似性,外语学习者对成语的理解和使用普遍存在困难。

关键词：土耳其语汉语含“牛”成语中外语言对比

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