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Spin-3/2 Ising model AFM/AFM two-layer lattice with crystal field

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Chinese Physics B 2009年第10期18卷 4193-4207页

作者： erhan Albayrak Ali Yigit Department of Physics Erciyes University

The spin-3/2 Ising model is investigated for the case of antiferromagnetic （AFM/AFM） interactions on the two- layer Bethe lattice by using the exact recursion relations in the pairwise approach for given coordination numbers q=3, 4 and 6 when the layers are under the influences of equal external magnetic and equal crystal fields. The ground state （GS） phase diagrams are obtained on the different planes in detail and then the temperature-dependent phase diagrams of the system are calculated accordingly. It is observed that the system presents both second- and first-order phase transitions for all q, therefore, tricritical points. It is also found that the system exhibits double-critical end points and isolated points. The model also presents two Neel temperatures, TN, and the existence of which leads to the reentrant behaviour.

关键词： Bethe lattice spin ground state AFM/AFM layer phase

Phase diagrams of spin-3/2 Ising model in the presence of random crystal field within the effective field theory based on two approximations

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Chinese Physics B 2013年第10期22卷 186-191页

作者： Ali Yigit erhan Albayrak Department of Physics anklrl Karatekin University Department of Physics Erciyes University

The bimodal random crystal field （A） effects are investigated on the phase diagrams of spin-3/2 Ising model by using the effective-field theory with correlations based on two approximations： the general van der Waerden identity and the approximated van der Waerden identity. In our approach, the crystal field is either turned on or turned off randomly for a given probability p or q = 1 -p, respectively. Then the phase diagrams are constructed on the （A,kT/J） and （p,kT/J） planes for given p and A, respectively, when the coordination number is z = 3. Furthermore, the effect of randomization of the crystal field is illustrated on the （△,kT/J） plane for p = 0.5 when z - 3,4, and 6. All these are carried out for both approximations and then the results are compared to point out the differences. In addition to the lines of second-order phase transitions, the model also exhibits first-order phase transitions and the lines of which terminate at the isolated critical points for high p values.

关键词： spin-3/2 random crystal field effective-field theory isolated critical point

Critical properties of mixed spin-1 and spin-5/2 with equal and unequal crystal fields

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Chinese Physics B 2012年第2期21卷 202-209页

作者： Ali Yigit erhan Albayrak ankIrI Karatekin University Department of Physics Erciyes University Department of Physics

The effects of assuming equal or unequal crystal fields （CF） on the phase diagrams of a mixed spin-1 and spin-5/2 system are investigated in terms of the recursion relations on the Bethe lattice （BL）. The equal CF case was considered for the coordination numbers q = 3,4, and 6, while for q = 3 the unequal CF case was also studied. It was found that for the equal CF case, the model exhibits second-order phase transitions and two compensation temperatures for all q, the reentrant behavior for q = 4 and first-order phase transitions and tricritical point （TCP） for q = 6. In the unequal CF case for q = 3, the system yields first- and second-order phase transitions, TCP＇s, and three compensation temperatures. In addition, the TCP＇s in a very short range are classified as the stable and unstable ones depending on their free energies.

关键词： mixed spin Bethe lattice compensation ferrimagnet

Existence and Asymptotic Behavior of Solution of Cauchy Problem for the Damped Sixth-order Boussinesq Equation

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Acta Mathematicae Applicatae Sinica 2015年第3期31卷 735-746页

作者： Necat POLAT erhan PSKN Dicle University Department of Mathematics

We consider the existence, both locally and globally in time, as well as the asymptotic behavior of solutions for the Cauchy problem of the sixth-order Boussinesq equation with damping term. Under rather mild conditions on the nonlinear term and initial data, we prove that the above-mentioned problem admits a unique local solution, which can be continued to a global solution, and the problem is globally ***, under certain conditions, we prove that the global solution decays exponentially to zero in the infinite time limit.

关键词： Boussinesq equation Cauchy problem global solution asymptotic behavior damping term

Nitrogen addition promotes soil carbon accumulation globally

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Science China Life Sciences 2025年第1期 284-293页

作者： Xuemei Yang Suhui Ma erhan Huang Danhua Zhang Guoping Chen Jiangling Zhu Chengjun Ji Biao Zhu Lingli Liu Jingyun Fang Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking University Ministry of Education Key Laboratory for Transboundary Ecosecurity of Southwest China School of Ecology and Environmental ScienceYunnan University State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences

Soil is the largest carbon(C) reservoir in terrestrial ecosystems and plays a crucial role in regulating the global C cycle and climate *** nitrogen(N) deposition has been widely considered as a critical factor affecting soil organic carbon(SOC) storage, but its effect on SOC components with different stability remains unclear. Here, we analyzed extensive empirical data from 304 sites worldwide to investigate how SOC and its components respond to N addition. Our analysis showed that N addition led to a significant increase in bulk SOC(6.7%), with greater increases in croplands(10.6%) and forests(6.0%) compared to grasslands(2.1%). Regarding SOC components, N addition promoted the accumulation of plant-derived C(9.7%–28.5%) over microbial-derived C(0.2%), as well as labile(5.7%) over recalcitrant components(–1.2%), resulting in a shift towards increased accumulation of plant-derived labile C. Consistently, N addition led to a greater increase in particulate organic C(11.9%) than mineral-associated organic C(3.6%), suggesting that N addition promotes C accumulation across all pools, with more increase in unstable than stable pools. The responses of SOC and its components were best predicted by the N addition rate and net primary productivity. Overall, our findings suggest that N enrichment could promote the accumulation of plant-derived and non-mineral associated C and a subsequent decrease in the overall stability of soil C pool, which underscores the importance of considering the effects of N enrichment on SOC components for a better understanding of C dynamics in soils.

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Chaotic Aquila Optimization Algorithm for Solving Phase Equilibrium Problems and Parameter Estimation of Semi-empirical Models

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Journal of Bionic Engineering 2024年第1期21卷 486-526页

作者： Oguz Emrah Turgut Mert Sinan Turgut erhan Kırtepe Department of Industrial Engineering Faculty of Engineering and ArchitectureIzmir Bakircay UniversityMenemenizmirTurkey Department of Mechanical Engineering Faculty of EngineeringEge UniversityBornovaizmirTurkey Department of Motor Vehicles and Transportation Technologies Sirnak UniversitySirnakTurkey

This research study aims to enhance the optimization performance of a newly emerged Aquila Optimization algorithm by incorporating chaotic sequences rather than using uniformly generated Gaussian random *** work employs 25 different chaotic maps under the framework of Aquila *** considers the ten best chaotic variants for performance evaluation on multidimensional test functions composed of unimodal and multimodal problems,which have yet to be studied in past literature *** was found that Ikeda chaotic map enhanced Aquila Optimization algorithm yields the best predictions and becomes the leading method in most of the *** test the effectivity of this chaotic variant on real-world optimization problems,it is employed on two constrained engineering design problems,and its effectiveness has been ***,phase equilibrium and semi-empirical parameter estimation problems have been solved by the proposed method,and respective solutions have been compared with those obtained from state-of-art *** is observed that CH01 can successfully cope with the restrictive nonlinearities and nonconvexities of parameter estimation and phase equilibrium problems,showing the capabilities of yielding minimum prediction error values of no more than 0.05 compared to the remaining algorithms utilized in the performance benchmarking process.

关键词： Aquila optimization algorithm Chaotic maps Parameter estimation Phase equilibrium Unconstrained optimization

Effects of the Application of Different Concentrations of NaN3 for Different Times on the Morphological and Cytogenetic Characteristics of Barley （Hordeum vulgate L.） Seedlings

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Journal of Integrative Plant Biology 2005年第9期47卷 1101-1106页

作者： Ali Irfan ILBAS Yasemin EROGLU Halil erhan EROGLU Department of Biology Faculty of Yozgat Arts and Science Erciyes University 66100 Yozgat Turkey

Sodium azide （NAN3） has been used in many biological studies as a mutagen. In the present study, the morphological and cytogenetic effects of NaN3 on barley （Hordeum vulgare L.） seedlings were investigated. Seeds of barley were treated with different concentrations of NaN3 （0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mmol/L） and applied for different periods of time （3 and 4 h）. Parameters investigated, except for the mitotic index, were determined on Days 7 and 14. Increasing concentrations of NaN3 affected germination rates on Days 7 and 14 following application for 3 and 4 h. Although the length of the roots and leaves was affected by treatment with NaN3 on Day 14 of the germination period, coleoptile length was affected by NaN3 treatment on Day 7. Increasing concentrations of NaN3 and increased treatment period decreased the mitotic index compared with the untreated control. The inhibitory effects of NaN3 on the mitotic index indicate that NaN3 can have genotoxic and mutagenic effects on barley seedlings.

关键词： Hordeum vulgare mitotic index NAN3.

Synchronous and metachronous occurrence of gastric adenocarcinoma and gastric lymphoma: A review of the literature

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World Journal of Gastroenterology 2006年第22期12卷 3564-3574页

作者： erhan Hamaloglu Serdar Topaloglu Arif Ozdemir Ahmet Ozenc Department of Surgery School of Medicine Hacettepe University06100 SihhiyeAnkaraTurkey First Department of Surgery Ankara Numune Training and Research Hospital 06100 SlhhiyeAnkaraTurkey Co-first-authors:Erhan HamalogluSerdar Topaloglu

The occurrence of both primary gastric lymphoma and gastric adenocarcinoma in the same patient is a rare entity. The possible causative factors of synchronous or metachronous occurrence of both malignancies and variet... 详细信息

关键词： Gastric adenocarcinoma Gastric lymphoma Synchronous occurrence Metachronous occurrence

An investigation of gamma ray mass attenuation from 80.1 to 834.86 keV for fabric coating pastes used in textile sector

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Nuclear Science and Techniques 2020年第6期31卷 52-59页

作者： Alev Erenler Tuncay Bayram Yusuf Demirel erhan Cengiz Rıza Bayrak Gerze Vocational School Sinop UniversitySinopTurkey Department of Physics Karadeniz Technical University61080 TrabzonTurkey Department of Engineering Fundamental Sciences Alanya Alaaddin Keykubat UniversityAntalyaTurkey Vocational School of Health Services Sinop UniversitySinopTurkey

In the present study,we investigate several textile coating pastes used in the market based on their radiation protection capability for gamma *** gamma ray mass absorption coefficients of some coating pastes doped with antimony,boron and silver elements have been *** has been determined that the gamma ray mass attenuation coefficient decreases rapidly as the energy of the gamma rays *** was determined that the doping of the main printing paste with silver and antimony considerably increased the gamma ray absorption capability of main ***,the doping of the paste with boron reduces the mass absorption of gamma *** particular,the gamma ray mass absorption power of the main paste doped with silver and antimony was determined to be useful in the gamma energy range from 80 to *** indicates that the newly doped textile material may be considered for radiation protection in the case of low-energy gamma rays.

关键词： Gamma ray absorption Radiation protection Printing pastes antimony silver