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Evaluation of periglacial landforms and formation of soil properties on the Mount Honaz,SW türkiye

Journal of Mountain Science 2024年第9期21卷 3047-3067页

作者： SERİN Soner UNCU Levent DEDE Volkan tÜRKEŞMurat Institute of Social Sciences İstanbul Universityİstanbul 34119Türkiye Department of Geography BilecikŞeyh Edebali UniversityBilecik 11234Türkiye Department of Geography Ardahan UniversityArdahan 75002Türkiye Center for Climate Change and Policy Studies Boğaziçi Universityİstanbul 34342Türkiye

the main aim of this study is to explain periglacial processes on the summits of Mount Honaz(2571 m a.s.l.),define periglacial landforms,and determine the relationships between morphometric features and topographic *** circles,stony earth circles,non sorted steps,and non sorted stripes were identified on the summits of Mount ***'s correlation coefficient(r)and linear regression analyses were performed by taking metric measurements from 125 periglacial landforms to describe their morphometric features(length,width,height)of periglacial landforms and explain the relationships between them and topographic factors(elevation,slope).to explain the relationships between periglacial landforms and soil properties,soil samples from 11 periglacial landforms were taken and *** landforms,which continue to develop on the summits of Mount Honaz today,have been evaluated with present climate *** of soil samples indicates a notable impact of parent material on the genesis of periglacial *** high ratio of organic matter in mud circle and non sorted step landforms and the high lime ratio in stony earth circle landforms prove a strong relationship between the formation mechanisms of landforms and the soil ***,it is consistent with the findings obtained from the analysis that severe periglacial processes and washing and scavenging events are experienced more on the northern slopes.

关键词： Periglacial processes and geomorphology Soil analysis Morphometric analysis Mount Honaz türkiye

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MICROStRUCtURES AND MECHANICAL PROPERtIES OF IN-SItU Al_2O_3/tiAl COMPOSItES BY EXOtHERMIC DISPERSION MEtHOD

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Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 437-443页

作者： t.t. Ai Department of Materials Science and Engineering Shaanxi University of Technology Hanzhong 723003 China

In-situ Al2O3/tiAl composites were fabricated by pressure-assisted exothermic dispersion （PAXD） method from elemental powder mixtures of ti, Al, tiO2, and Nb2O5. the microstructures and mechanical properties of the as-sintered composites are investigated. the results show that the as-sintered products consist of γ-tiAl, α2-ti3Al, Al2O3, and NbAl3 phases. Microstructure analysis indicates that Al2O3 particles tend to disperse on the grain boundaries. Application of a moderate pressure of 35 MPa at 1200℃ yields Al2O3/tiAl composites with fine Al2O3 reinforcement and a discontinuous network linking by Al2O3 particles. the aluminide component has a fine submicron γ ＋α2 lamellar microstructure. With increasing Nb2O5 content, Al2O3 particles are dispersed uniformly in the matrix. the hardness of the composites increases gradually, and the bending strength and fracture toughness of the composites reach to the maximum value, respectively.

关键词： Al2 O3/tiAl composites Microstructure Mechanical properties

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Effect of Aluminum on FOX-7 Structure

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火炸药学报 2019年第3期42卷 223-231,I0001页

作者： Lemi türker Middle East technical University Department of Chemistry üniversiteler

the effect of aluminum on FOX-7 structure was considered. Density functional approach at the level of unrestricted B3LYP/6-311++G(d,p) level was adopted. the model considered 1-4 aluminum atoms per FOX-7 molecule. the results show that the molecular geometries as well as many molecular orbital characteristics of FOX-7 molecule are subjected multiplicity of the composites, FOX-7 + n Al ( n =1-4). In the case of n =1-2, some conformational changes occur. In the presence of three aluminum atoms, the quartet state of the composite is stable but in the doublet state, one of the N—O bonds ruptures. As for the n =4 case the singlet and triplet states are stable but in the quintet state one of the N—O bonds cleaves. As the number of aluminum atoms increases, the HOMO-LUMO energy gap decreases generally.

关键词： FOX-7 1,1-diamino-2,2-dinitroethylene DADNE explosives aluminum DFt

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Effect of Magnesium Atom on CL-20------A DFt treatment

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火炸药学报 2017年第6期40卷 17-22页

作者： Lemi türker Department of Chemistry Universiteler Middle East Technical University Ankara Turkey 06231

the effect of magnesium atom on 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtizane(HNIW,CL-20)explosive is considered within the constraints of density functional theory at the level of B3LYP/6-31++G(d,p).the Mg atom transfers some electron population to CL-20and one of the nitro groups linked to 6-membered piperazine ring system(base)is expelled in the prenitrite *** total Mulliken charges on the NO2group reveals that the respective nitramine bond in CL-20is the most susceptible one to *** calculated IR and UV-VIS spectra are *** effect of Mg atom on the molecular orbital energies,especially the HOMO and LUMO has been *** of the interfrontier molecular orbital energy gap(Δε)in the composite system ***,the composite system is more susceptible to impact compared to CL-20.

关键词： CL-20 hexanitro hexaazaisowurtizane explosives magnesium density functional theory

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Effect of size on biaxial flexural strength for cement-based materials by using a triangular plate method

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Frontiers of Structural and Civil Engineering 2022年第8期16卷 1017-1028页

作者： Hakan t tURKER Department of Civil Engineering Bursa Uludag UniversityBursa 16059Turkey

the effect of size on the biaxial flexural strength(BFS)of Portland cement mortar was investigated by using the recently proposed triangular plate method(tPM).An experimental program was conceived to study the size effect by keeping a constant water-cement ratio of 0.485,cement-sand ratio of 1:2.75,and using unreinforced triangular mortar plates of five different thicknesses and seven different side *** BFS of the produced specimens was tested,and variations of BFS depending on specimen thickness and side length were *** results indicated that increases in triangular plate specimen side length and specimen thickness led to a decrease in the BFS of Portland cement *** effect of specimen length increase on BFS was more significant than on the effect of the specimen *** variations in specimens’thickness indicated a deterministic type I size effect,while the variations in specimens’length showed an energetic-statistical type I size effect.

关键词： testing apparatus&methods plain concrete tensile properties biaxial flexural strength triangular plate method

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Interaction of 1,3,3-trinitroazetidine(tNAZ)and Zinc——A DFt treatise

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火炸药学报 2020年第5期43卷 477-483,I0001页

作者： Lemi türker Middle East technical University Department of ChemistryüniversitelerEskisehir Yolu No.106800 ankaya/AnkaraTurkey

In order to investigate whether zinc atom is compatible with 1, 3, 3-trinitroazetidine(tNAZ) structure, tNAZ+Zn and 2 tNAZ+Zn composite systems have been considered within the constraints of density functional theory at the level of B3 LYP/6-31++G(d,p) and ωB97 X-D/6-31++G(D,P). In the case of tNAZ+Zn composite the both level of calculations resulted that one of the C-NO2 bonds of tNAZ undergoes bond cleavage. However, as the zinc content decreases by increasing the tNAZ content, C-NO2 bond elongation considerably decreases, although it is still longer than the similar bonds in 2 tNAZ+Zn composite in which zinc, by weight, is 7.14%. In all the cases the zinc atom acquires positive charge. the results indicate that the interfrontier molecular orbital energy gaps(HOMO-LUMO energy difference) of the composites decrease as the zinc content decreases.

关键词： quantum chemistry 1,3,3-trinitroazetidine tNAZ explosive zinc DFt

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Quire Interaction of Certain Nitramine type Explosives with Proton--A DFt Study

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火炸药学报 2017年第1期40卷 1-6页

作者： Lemi türker Department of Chemistry Middle East technical University Ankara Turkey 06231

the composites of certain nitramine type explosives,tEtRYL,RDX and EDNA,with proton in vacuum have been considered within the constraints of density functional theory at the level of B3LYP/6-31++G(d,p)(restricted and unrestricted).the results indicate that unexpectedly hydrogen molecule production occurs by the interaction of proton and a hydrogen of CH3(tEtRYL)and CH2(RDX and EDNA)*** a result,a carbocation is generated on the explosive ***,tEtRYL which potentially has many protonation sites were investigated in more detail in vacuum and aqueous *** data reveals that the composite system(tEtRYL+proton)is less stable than tEtRYL protonated on nitramine NH or oxygen of the nitro groups.

关键词： nitramines tEtRYL RDX EDNA proton DFt

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Endohedrally Helium-doped CL-20:A DFt treatment

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火炸药学报 2018年第5期41卷 434-440页

作者： Lemi türker department of chemistry Universiteler middle east technical universityAnkara Turkey 062310

In order to investigate whether endohedral He-doping is possible or not in CL-20,a density functional treatment has been carried out at the levels of B3LYP/6-31++G(d,p)and B3PW91/6-31++G(d,p).Some physicochemical and quantum chemical properties of the helium-doped CL-20 (He@CL-20)are compared with the respective values of the parent explosive *** helium doping caused swelling of CL-20cage but no bond rupture *** helium acquired some positive charge.

关键词： CL-20 explosives Helium Endohedral doping density functional

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Synergistic fibroblast optimization: a novel nature-inspired computing algorithm

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Frontiers of Information technology & Electronic Engineering 2018年第7期19卷 815-833页

作者： t t DHIVYAPRABHA P SUBASHINI M KRISHNAVENI Department of Computer Science Avinashilingam Institute for Home Science and Higher Education for Women

the evolutionary algorithm, a subset of computational intelligence techniques, is a generic population-based stochastic optimization algorithm which uses a mechanism motivated by biological concepts. Bio-inspired computing can implement successful optimization methods and adaptation approaches, which are inspired by the natural evolution and collective behavior observed in species, respectively. Although all the meta-heuristic algorithms have different inspirational sources, their objective is to find the optimum(minimum or maximum), which is problem-specific. We propose and evaluate a novel synergistic fibroblast optimization(SFO) algorithm, which exhibits the behavior of a fibroblast cellular organism in the dermal wound-healing process. Various characteristics of benchmark suites are applied to validate the robustness, reliability, generalization, and comprehensibility of SFO in diverse and complex situations. the encouraging results suggest that the collaborative and self-adaptive behaviors of fibroblasts have intellectually found the optimum solution with several different features that can improve the effectiveness of optimization strategies for solving non-linear complicated problems.

关键词： Synergistic fibroblast optimization (SFO) Fitness analysis Convergence Benchmark suite Monk's dataset

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Seedy CD8+ t_(RM) cells in aging lungs drive susceptibility to pneumonia and sequelae

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Cellular & Molecular Immunology 2021年第4期18卷 787-789页

作者： Anukul t.Shenoy Joseph P.Mizgerd Pulmonary Center Boston University School of MedicineBostonMA 02118USA Department of Medicine Boston University School of MedicineBostonMA 02118USA Department of Microbiology Boston University School of MedicineBostonMA 02118USA Department of Biochemistry Boston University School of MedicineBostonMA 02118USA

Aging is a leading risk factor for pneumonia and subsequent comorbidities,including chronic pulmonary diseases.1 the underlying causes of age-related susceptibility to pneumonia-related morbidity and mortality are complex and poorly *** aging has been associated with many changes in diverse immune compartments,if and how aging affects resident immune cells in the lung have not been examined.

关键词： aging susceptibility subsequent

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