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Molecular Dynamics Study of a Thermal Expansion Coefficient： Ti bulk with an Elastic Minimum image Method

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Chinese Physics Letters 2006年第5期23卷 1068-1071页

作者： Yakup Hundur Rainer Hippler ziya b. Güven Department of Physics Istanbul Technical University Ayazaga Istanbul TR-34469 Turkey Institut für Physik Ernst-Moritz-Arndt-Universitat Greifswald DomstraBe 10a D-17487 Greifswald. Germany Electronic and Communication Engineering Cankaya University Balgat Ankara TR-06530 Turkey

Linear thermal expansion coefficient （TEC） of Ti bulk is investigated by means of molecular dynamics simulation. The elastic minimum image convention of periodic boundary conditions is introduced to allow the bulk to adjust its size according to the new fixed temperature. The TEC and the specific heat of Ti are compared to the available theoretical and experimental data.

关键词： TITANIUM

Development of an aftershock occurrence model calibrated for Turkey and the resulting likelihoods

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 149-160页

作者： ziya Muderrisoglu Ufuk Yazgan Department of Civil Engineering Beykent UniversityIstanbulTurkey(formerly at Istanbul Technical University Earthquake Engineering and Disaster Management Institute Istanbul Technical UniversityIstanbulTurkey

This paper presents the calibration of Omori’s aftershock occurrence rate model for Turkey and the resulting likelihoods. Aftershock occurrence rate models are used for estimating the probability of an aftershock that exceeds a specific magnitude threshold within a time interval after the mainshock. Critical decisions on the post-earthquake safety of structures directly depend on the aftershock hazard estimated using the occurrence model. It is customary to calibrate models in a region-specific manner. These models depend on rate parameters(a, b, c and p) related to the seismicity characteristics of the investigated region. In this study, the available well-recorded aftershock sequences for a set of Mw ≥ 5.9 mainshock events that were observed in Turkey until 2012 are considered to develop the aftershock occurrence model. Mean estimates of the model parameters identified for Turkey are a =-1.90, b = 1.11, c = 0.05 and p = 1.20. based on the developed model, aftershock likelihoods are computed for a range of different time intervals and mainshock magnitudes. Also, the sensitivity of aftershock probabilities to the model parameters is investigated. Aftershock occurrence probabilities estimated using the model are expected to be useful for post-earthquake safety evaluations in Turkey.

关键词： aftershock occurrence model aftershock likelihoods rate parameters aftershock hazard

Structure and Thermal Parameters of Ni_(20)Pd_(80) Alloy

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Journal of Materials Science & Technology 2009年第2期25卷 208-210页

作者： S. Ahmad A.b. ziya A. Aziz Z.I. Zafar Department of Physics Bahauddin Zakariya University Department of Chemistry Bahauddin Zakariya University

The structure and thermal parameters of Ni20Pd80 alloy were studied by X-ray diffraction（XRD）. The diffraction experiments performed in the temperature range of 308-1100 K revealed that the alloy formed a face centered cubic （fcc） Al-type structure. The temperature dependence of the lattice parameters was investigated by using the bragg line displacement method showing that the lattice parameter increases with the increase of temperature. The mean linear thermal expansion （MLTE（%））, coefficient of thermal expansion （CTE, α）, the characteristic Debye temperature （（θD） and mean square amplitudes of vibration were determined from XRD data. The value of Debye temperature was found to be 253 K. It was found that temperature factor was independent of the static displacements.

关键词： Alloys Structure Thermal parameters X-ray diffraction (XRD)

泪膜破裂时间测定在青少年干眼症诊断中的准确性和可靠性评价

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中国现代医生 2024年第17期62卷 54-58页

作者：刘子雅姜聪聪温州市中西医结合医院眼科浙江温州325000

目的研究泪膜破裂时间(tear film rupture time,TbUT)测定在青少年干眼症诊断中的准确性和可靠性评价。方法选取2021年9月至2023年9月,于笔者医院就诊的青少年干眼症患者185例作为观察组,并选取20例健康青少年作为对照组,分析TbUT测定... 详细信息

目的研究泪膜破裂时间(tear film rupture time,TbUT)测定在青少年干眼症诊断中的准确性和可靠性评价。方法选取2021年9月至2023年9月,于笔者医院就诊的青少年干眼症患者185例作为观察组,并选取20例健康青少年作为对照组,分析TbUT测定在青少年干眼症诊断中的准确性和可靠性评价。结果185例患者,侵入性TbUT检测检出132例,总检出率为71.35%,非侵入性TbUT检测检出160例,总检出率为84.49%,组间差异有统计学意义(PbUT检测非睑板腺功能障碍检出率为41.62%、睑板腺功能障碍检出率为29.73%,非侵入性TbUT检测非睑板腺功能障碍检出率为63.24%、睑板腺功能障碍检出率为23.24%,组间差异有统计学意义(PbUT、首次TbUT、平均TbUT显著降低(Pb组TbUT、首次TbUT、平均TbUT显著降低,组间差异有统计学意义(PbUT检测的敏感度为72.49%,特异性为75.88%,AUC为0.762,非侵入性TbUT检测敏感度为87.24%,特异性为90.05%,曲线下面积(areaunder the curve,AUC)为0.926。结论TbUT测定在青少年干眼症诊断中具有诊断价值,且与侵入性TbUT检测比较,非侵入TbUT检测的准确性及可靠性更好。

关键词：泪膜破裂时间青少年干眼症诊断准确性可靠性

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Indentation fracture toughness of single-crystal bi2Te3 topological insulators

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Nano Research 2016年第4期9卷 1032-1042页

作者： Caterina Lamuta Anna Cupolillo Antonio Politano ziya S. Aliev Mahammad b. babanly Evgueni V. Chulkov Leonardo Pagnotta Department of Mechanical Energy and Management Engineering University ofCalabria Ponte P Bucci Cuba 44C 87036 Rende Italy Department of Physics University of Calabria Ponte P Bucci Cuba 31 C 87036 Rende Italy Institute of Catalysis and Inorganic Chemistry ANAS AZ1143 Baku Azerbaijian Institute of Physics ANAS AZ1143 Baku Azerbaijian Donostia International Physics Center (DIPC) Paseo de Manuel Lardizabal 4 20018 San Sebastian/Donostia Spain Departamento de Fisica de Materiales Universidad del Pals Vasco Apartado 1072 20080 San Sebastidn/Donostia Spain Centro de Fisica de Materiales CFM-Materials Physics Center MPC Centro Mixto CSIC-UPV/EHU Paseo de Manuel Lardizabal 5 20018 San Sebastion/Donostia Spain Saint Petersburg State University 198504 Saint Petersburg Russian Federation Tomsk State University 634050 Tomsk Russian Federation

bismuth teUuride （bi2Te3） is one of the most important commercial thermoelectric materials. In recent years, the discovery of topologically protected surface states in bi chalcogenides has paved the way for their application in nanoelectronics. Determination of the fracture toughness plays a crucial role for the potential application of topological insulators in flexible electronics and nanoelectro- mechanical devices. Using depth-sensing nanoindentation tests, we investigated for the first time the fracture toughness of bulk single crystals of bi2Te3 topological insulators, grown using the bridgmantockbarger method. Our results highlight one of the possible pitfalls of the technology based on topological insulators.

关键词： topological insulators bismuth telluride (bi2Te3) fracture toughness nanoindentation

Density Functional Study of Physical and Chemical Properties of Nano Size boron Clusters： bn （n=13-20）

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Chinese Journal of Chemical Physics 2009年第4期22卷 380-388,447页

作者： Murat Atis Cem Ozdogan ziya b. GAuvenc 内夫谢希尔大学物理系 50300 内夫谢希尔 Cankaya大学计算机工程系 Balgat 06530安卡拉 Cankaya大学电子与通讯工程系 Balgat 06530安卡拉

boron is an element that has ability to build strong and highly directional bonds with boron itself. As a result, boron atoms form diverse structural motifs, ultimately can yield distinct nano structures, such as planar, quasi-planar, convex, cage, open-cage, tubular, spherical, ring, dome-like, shell, capsule, and so on, i.e., it can take almost any shape. Therefore, a deep understanding of the physical and chemical properties becomes important in boron cluster chemistry. Electronic and geometric structures, total and binding energies, harmonic frequencies, point symmetries, charge distributions, dipole moments, chemical bondings and the highest occupied molecular orbital-lowest unoccupied molecular orbital energy gaps of neutral bn （n=13-20） clusters have been investigated by density functional theory （DFT）, b3LYP with 6-311＋＋G（d,p） basis set. Furthermore, the first and the second energy differences are used to obtain the most stable sizes. We have observed that almost all physical properties are size dependent, and double-ring tubular form of b20 has the highest binding energy per atom. The icosahedral structure with an inside atom is found as impossible as a stable structure for the size thirteen. This structure transforms to an open-cage form. The structural transition from two-dimensional to three-dimensional is found at the size of 20 and consistent with the literature. The calculated charges by the Mulliken analysis show that there is a symmetry pattern with respect to the x-z and y-z planes for the charge distributions. The unusual planar stability of the boron clusters may be explained by the delocalized π and σ bonding characteristic together with the existence of the multicentered bonding. The results have been compared to available studies in the literature.

关键词： Cluster boron Density functional theory

Non-equivalent D-A copolymerization strategy towards highly efficient polymer donor for polymer solar cells

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Science China Chemistry 2021年第6期64卷 1031-1038页

作者： ziya Shang Liuyang Zhou Chenkai Sun Lei Meng Wenbin Lai Jinyuan Zhang Wenchao Huang Yongfang Li beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 455001China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528216China Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

D-A copolymerization is a broadly utilized molecular design strategy to construct high efficiency photovoltaic materials for polymer solar cells(PSCs),and all the D-A copolymer donors reported till now are the alternate D-A copolymers with equal D-and ***,we first propose a non-equivalent D-A copolymerization strategy with unequal D-and A-units,and develop three novel non-equivalent D-A copolymer donors(PM6-D1,PM6-D2 and PM6-D3 with D/A unit ratio of 1.1:0.9,1.2:0.8 and1.3:0.7,respectively)by inserting more D units into the alternate D-A copolymer PM6 backbone to finely tune the physicochemical and photovoltaic properties of the *** three non-equivalent D-A copolymers show the down-shifted highest occupied molecular orbital(HOMO)energy levels,higher hole mobility,higher degree of molecular self-assembly and higher molecular crystallinity with the increase of D-unit ratio in comparison with the alternate D-A copolymer *** a result,all the three non-equivalent D-A copolymer-based PSCs with Y6 as acceptor achieve improved power conversion efficiency(PCE)with higher V_(oc),larger J_(sc)and higher FF ***,the PM6-D1:Y6 based PSC achieved a high PCE of17.71%,which is significantly higher than that(15.82%)of the PM6:Y6 based PSC and is one of the highest performances in the binary PSCs.

关键词： polymer solar cells conjugated polymer donor materials donor-acceptor copolymers non-equivalent D-A copolymerization

SD-RLK28 positively regulates pollen hydration on stigmas as a PCP-bβ receptor in Arabidopsis thaliana

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Journal of Integrative Plant biology 2023年第10期65卷 2395-2406页

作者： Li Guo ziya Huang Xingyu Chen Min Yang Miaomiao Yang Ziwei Liu Xuejie Han Xiangjie Ma Xiaoli Wang Qiguo Gao College of Horticulture and Landscape Architecture Chongqing 400716China Ministry of Education Key Laboratory of Horticulture Science for Southern Mountainous RegionsChongqing 400716China

Pollen hydration on dry stigmas is strictly regulated by pollen–stigma interactions in brassicaceae. Although several related molecular events have been described, the molecular mechanism underlying pollen hydration remains elusive. Multiple b-class pollen coat proteins(PCP-bs) are involved in pollen hydration. Here, by analyzing the interactions of two PCP-bs with three Arabidopsis thaliana stigmas strongly expressing S-domain receptor kinase(SD-RLK), we determined that SD-RLK28 directly interacts with PCP-bβ. We investigated pollen hydration, pollen germination, pollen tube growth, and stigma receptivity in the sd-rlk28 and pcp-bβ mutants. PCP-bβ acts in the pollen to regulate pollen hydration on stigmas. Loss of SD-RLK28 had no effect on pollen viability, and sd-rlk28 plants had normal life cycles without obvious defects. However,pollen hydration on sd-rlk28 stigmas was impaired and pollen tube growth in sd-rlk28 pistils was delayed. The defect in pollen hydration on sd-rlk28 stigmas was independent of changes in reactive oxygen species levels in stigmas. These results indicate that SD-RLK28 functions in the stigma as a PCP-bβ receptor to positively regulate pollen hydration on dry stigmas.

关键词： Arabidopsis thaliana PCP-b pollen hydration pollen-stigma interaction reactive oxygen species SD-RLK

Calculation of the Spinning Speed of a Free Electron

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Journal of Modern Physics 2020年第1期11卷 9-15页

作者： Mesude Saglam burcin bayram ziya Saglam Hanasli Gur Department of Physics Faculty of Science University of Ankara Ankara Turkey Department of Physics Miami University Oxford OH USA Department of Physics Faculty of Science University of Aksaray Aksaray Turkey Department of Engineering in Physics Ankara University Ankara Turkey

In a recent work, we calculated the magnetic field inside a free electron due to its spin, and found it to be about b = 8.3 × 1013 T. In the present study we calculate the spinning speed of a free electron in the current loop model. We show that spinning speed is equal to the speed of light. Therefore it is shown that if electron was not spinning the mass of electron would be zero. but since spinning is an unseparable part of an electron, we say that mass of electron is non-zero and is equal to (m = 9.11 × 10−28 g).

关键词： Spinning Speed Intrinsic Current Intrinsic Magnetic Field The Intrinsic Flux of Electron Current Loop Model