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Frequency and voltage-dependent electrical and dielectric properties of Al/Co-doped PVA/p-Si structures at room temperature

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Chinese Physics B 2014年第4期23卷 545-550页

作者： Ibrahim Ycedag ahmet Kaya Semsettin Altindal Ibrahim Uslu Department of Computer Engineering Technology Faculty Duzce University Department of Opticianry Vocationel School of Medical Sciences Turgut Ozal University Department of Physics Faculty of Science and Arts Gazi University Department of Chemistry Faculty of Science and Arts Gazi University

In order to investigate of cobalt-doped interracial polyvinyl alcohol （PVA） layer and interface trap （Dit） effects, A1/p- Si Schottky barrier diodes （SBDs） are fabricated, and their electrical and dielectric properties are investigated at room temperature. The forward and reverse admittance measurements are carded out in the frequency and voltage ranges of 30 kHz-300 kHz and -5 V-6 V, respectively. C-V or er-V plots exhibit two distinct peaks corresponding to inversion and accumulation regions. The first peak is attributed to the existence of Dit, the other to the series resistance （Rs）, and interfacial layer. Both the real and imaginary parts of dielectric constant （er and err） and electric modulus （Mr and Mrr）, loss tangent （tan~）, and AC electrical conductivity （aac） are investigated, each as a function of frequency and applied bias voltage. Each of the M~ versus V and Mrr versus V plots shows a peak and the magnitude of peak increases with the increasing of frequency. Especially due to the Dit and interfacial PVA layer, both capacitance （C） and conductance （G/w） values are strongly affected, which consequently contributes to deviation from both the electrical and dielectric properties of A1/Co-doped PVA/p-Si （MPS） type SBD. In addition, the voltage-dependent profile of Dit is obtained from the low-high frequency capacitance （CLF-CHF） method.

关键词： Al/Co-PVA/p-Si (MPS) electrical and dielectric properties AC electrical conductivity frequencyand voltage dependence

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Illumination and Voltage Dependence of Electrical Characteristics of Au/0.03 Graphene-Doped PVA/n-Si Structures via Capacitance/Conductance-Voltage Measurements

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Chinese Physics Letters 2015年第11期32卷 92-96页

作者： SAHAR Alialy ahmet Kaya I Uslua EMSETTIN Altmdal physics Department Faculty of Sciences Gazi University Ankara 06500 Turkey Opticianry Department Vocat Sch IVied Sci 7hrkey Turgut Ozal University Ankara 78050 Turkey Department of Chemistry Education Faculty of Education GazJ University Ankara 06500 Turkey

Au/n-Si （MS） structures with a high dielectric interlayer （0.03 graphene-doped PVA） are fabricated to investigate the illumination and voltage effects on electrical and dielectric properties by using capacitance-voltage （C-V） and conductance-voltage （G/w-V） measurements at room temperature and at 1 MHz. Some of the main electrical parameters such as concentration of doping atoms （ND）, barrier height （ ФB（ C - V））, depletion layer width （WD） and series resistance （Rs） show fairly large illumination dispersion. The voltage-dependent profile of surface states （Nss） and resistance of the structure （Ri ） are also obtained by using the dark-illumination capacitance （Cdark- Cm） and Nicollian-Brews methods, respectively, For a clear observation of changes in electrical parameters with illumination, the values of ND, WD, ФB（O- V） and Rs are drawn as a function of illumination intensity. The values of ND and WD change almost linearly with illumination intensity. On the other hand, Rs decreases almost exponentially with increasing illumination intensity whereas ФB（C - V） increases. The experimental results suggest that the use of a high dielectric interlayer （0.03 graphene-doped PVA） considerably passivates or reduces the magnitude of the surface states. The large change or dispersion in main electrical parameters can be attributed to generation of electron-hole pairs in the junction under illumination and to a good light absorption. All of these experimental results confirm that the fabricated Au/0.03 graphene-doped PVA/n-Si structure can be used as a photodiode or a capacitor in optoelectronic applications.

关键词： Si PVA Illumination and Voltage Dependence of Electrical Characteristics of Au/0.03 Graphene-Doped PVA/n-Si Structures via Capacitance/Conductance-Voltage Measurements

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Poincaré-MacMillan Equations of Motion for a Nonlinear Nonholonomic Dynamical System

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Chinese Physics Letters 2012年第3期29卷 132-134页

作者： Amjad Hussain Syed Tauseef Mohyud-Din ahmet Yildirim Department of Mathematics Zhejiang UniversityHangzhou 310027 Department of Mathematics HITEC UniversityTaxila Cantt Pakistan Department of Mathematics Ege University35100 Bornova IzmirTurkey University of South Florida Department of Mathematics and StatisticsTampaFL 33620-5700USA

MacMillan's equations are extended to Poincaré's formalism,and MacMillan's equations for nonlinear nonholonomic systems are obtained in terms of Poincaré*** equivalence of the results obtained here with other forms ... 详细信息

关键词： Poincaré parameters MacMillan

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Alternating-current losses in two-layer superconducting cables consisting of second-generation superconductors coated by U-shaped ferromagnetic materials

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Chinese Physics B 2013年第12期22卷 509-513页

作者： ahmet Cicek Fedai Inanir Fedor Gmry Department of Physics Faculty of Arts and Sciences Mehmet Akif Ersoy University Department of Physics Faculty of Arts and Sciences Recep Tayyip Erdog an University Institute of Electrical Engineering Slovak Academy of Sciences Du'bravska' Cesta 9 842 39 Bratislava Slovakia

Alternating-current losses in a two-layer superconducting cable, each layer being composed of 15 closely-spaced rectangular wires made up of second-generation superconductors when the ends of wires are coated by either a non-magnetic or strong ferromagnetic material having a U profile is numerically investigated. Computations are carried out through the finite-element method. The alternating-current losses do not increase significantly if the relative permeability of the coating is increased three orders of magnitude, provided that the current amplitude is less than half of the critical current in a superconducting wire. However, the losses are much higher for ferromagnetic coating if the amplitude of the applied current oscillating at 50 Hz is close to the critical current. The ferromagnetic coating is seen to accumulate the magnetic field lines normally on its surfaces, while the field lines are parallel to the long axes of the wires, leading to more significant flux penetration in the coated regions. This facilitates a uniform low-loss current flow in the uncoated regions of the wires. In contrast, coating with a non-magnetic material gives rise to a considerably smaller current flow in the uncoated regions, whereas the low-loss flow is maintained in the coated regions. Moreover, the current flows in opposite directions in the coated and uncoated regions, where the direction in each region is converse for the two materials.

关键词： second-generation superconductor two-layer cable ferromagnetic coating U profile alternating-current losses

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Interaction properties of solitons for a couple of nonlinear evolution equations

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Chinese Physics B 2021年第1期30卷 185-190页

作者： Syed Tahir Raza Rizvi Ishrat Bibi Muhammad Younis ahmet Bekir Department of Mathematics COMSATS University IslamabadLahore CampusPakistan Punjab University College of Information Technology University of the PunjabLahorePakistan Neighbourhood of Akcaglan Imarli Street Number 28/426030EskisehirTurkey

We study one-and two-soliton solutions for the Cahn–Allen(CA) equation and the Brethorton equation. The CA equation has broad spectrum of applications especially in anti-phase boundary motion and it is used in phase-field *** the Brethorton equation is a model for dispersive wave systems, it is used to find the resonant nonlinear interaction among three linear modes. We use the Hirota bilinear method to obtain one-and two-soliton solutions to the CA equation and the Brethorton equation.

关键词： Hirota bilinear method soliton interaction evolution equations

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斗轮堆取料机的尾车选型

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机电产品开发与创新 2024年第1期37卷 100-102页

作者：游建能赵亚斌刘政宜昌港务集团有限责任公司湖北宜昌443003

悬臂式斗轮堆取料机是内陆散货堆场和港口码头主要作业设备,其尾车类别和结构型式多种多样,不同的作业场景,有不同的组合形式,可以实现不同的功能。本文通过枝城港16码头堆取料机设计过程中,对尾车的比对选型,分析了主要尾车形式的应用... 详细信息

悬臂式斗轮堆取料机是内陆散货堆场和港口码头主要作业设备,其尾车类别和结构型式多种多样,不同的作业场景,有不同的组合形式,可以实现不同的功能。本文通过枝城港16码头堆取料机设计过程中,对尾车的比对选型,分析了主要尾车形式的应用场景和优缺点,对尾车常见故障均提出了应对策略,以期对散货料场斗轮堆取料机尾车选型提供借鉴与参考。

关键词：斗轮堆取料机尾车设备选型

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On the Use of Nanofluids in Solar Energy Applications

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Journal of Thermal Science 2020年第3期29卷 513-534页

作者： CUCE Erdem CUCE Pinar Mert GUCLU Tamer BESIR ahmet Burhaneddin Department of Mechanical Engineering Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey Low/Zero Carbon Energy Technologies Laboratory Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey Department of Energy Systems Engineering Faculty of EngineeringRecep Tayyip Erdogan UniversityZihni Derin Campus53100 RizeTurkey

Renewable energy technologies are in the centre of interest to narrow the gap between fossil fuels and clean energy *** dominant role of solar energy systems among the alternatives is beyond question owing to being associated with an infinite energy source,well-documented theory,simplicity,eco-friendly structure and notably higher energy and exergy efficiency range compared to other ***,in solar energy systems,conventional working fluids with poor thermophysical properties are still *** other words,further improvements are still available in the said systems by the use of unique nanoparticles with superior thermal,electrical,optical and mechanical *** the scope of this research,the applications of nanofluids in various solar energy systems such as tracking and non-tracking solar collectors,photovoltaic/thermal systems,solar thermoelectric devices,solar stills,solar thermal energy storage systems,solar greenhouses and solar ponds are comprehensively *** comparisons and discussions are proposed for the potential impacts of various nanofluids on coefficient of performance(COP)and thermodynamic performance figures of solar energy systems such as energy and exergy efficiency,effectiveness and *** challenges of nanofluids are also addressed which need to be resolved in further works.

关键词： nanofluids solar energy applications thermal and electrical performance COP cost

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The number of intracorneal ring segments in asymmetric and central cones

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Eye and Vision 2021年第1期8卷 83-91页

作者： Canan Asli Utine DenizcanÖzizmirliler Mustafa Kayabaşı Üzeyir Günenç Department of Ophthalmology Faculty of MedicineDokuz Eylul UniversityMithatpasa cadNo:1606 InciraltıKampusuBalcova35330 IzmirTurkey Izmir Biomedicine and Genome Center IzmirTurkey

Background:To compare the results of single versus double intracorneal ring segment(ICRS)(KeraRing)implantation in keratoconus with respect to different cone ***:Twenty-two eyes of 18 patients with totally asymmetric cones(20-80%or 0-100%distribution along steep axis)were implanted with single ICRS(Group 1),38 eyes of 32 patients with central or partially asymmetric cones(50-50%or 40-60%distribution along steep axis)were implanted with double ICRS(Group 2),at a depth of 80%of the site of implantation,in channels created with femtosecond laser *** patients had uncorrected and corrected distance visual acuities(UDVA and CDVA,respectively)of≤0.3 Snellen ***:In both groups,patients had median UDVA and CDVA gain of 3 Snellen lines(P>0.05).Postoperative improvement in indices of vertical asymmetry and height decentration in Group 1;simulated keratometry,corneal astigmatism and anterior corneal asphericity values in Group 2 were greater(P<0.05).A total of 10 eyes(45.5%)in Group 1 were recommended double ring implantation by the manufacturer’s nomogram,but underwent single ICRS implantation and achieved visual,refractive,tomographic outcomes comparable to that in Group 2,although corneal cylindrical correction was less and final topographic astigmatism was ***:Double ICRS implantation seems to be superior in terms of keratometry,corneal astigmatism and anterior corneal asphericity *** ICRS implantation in totally asymmetric cones seems to provide satisfactory visual,refractive and tomographic results,similar to double ICRS implantation in central and partially asymmetric cones,by inducing central shift of the cone.

关键词： Cone eccentricity Intracorneal ring segment implantation Keratoconus Nomogram

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Conventional and microwave irradiated synthesis,biological activity evaluation and molecular docking studies of highly substituted piperazine-azole hybrids

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Chinese Chemical Letters 2017年第5期28卷 995-1005页

作者： Arif Mermer Serpil Demirci Serap Basoglu Ozdemir ahmet Demirbas Serdar Ulker Faik ahmet Ayaz Fatma Aksakal Neslihan Demirbas Karadeniz Technical University Department of ChemistryTrabzon 61080Turkey Giresun University School of Applied ScienceDepartment of Crop Production and TechnologyGiresun 28000Turkey Recep Tayyip Erdogan University Department of BiologyRize 53100Turkey Karadeniz Technical University Department of BiologyTrabzon 61080Turkey Department of Chemistry Faculty of ScienceGebze Technical UniversityKocaeli 41400Turkey

Azole derivatives（3,6） obtained starting from 1-（2-methoxyphenyl） piperazine were converted to the corresponding Mannich bases containing β-lactame or flouroquinolone core via a one pot three component *** synthesis of conazole analogues was carried out starting from triazoles by three *** were carried out under conventional and microwave mediated *** the newly synthesized compounds were screened for their antimicrobial,enzyme inhibition and antioxidant activity,and most of them displayed good-moderate *** affinities and non-covalent interactions between enzyme-ligand complexes were predicted with molecular docking method at molecular *** results complemented well the experimental results on α-glucosidase and urease inhibitory effects of the *** binding affinities and much more interaction networks were observed for active compounds in contrary to inactive *** was predicted with the docking studies that triazole and anisole moieties in the structure of the synthesized compounds contributed to the stabilization of corresponding enzymes through noncovalent interactions.

关键词： Fluoroquinolone 1 2 4-Triazole Microwave Mannich reaction Biological activity Molecular docking

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Assessing fire severity in Turkey's forest ecosystems using spectral indices from satellite images

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林业研究:英文版 2023年第6期34卷 1747-1761页

作者： Coşkun Okan Güney ahmet Mert Serkan Gülsoy Department of Forest Fires Aegean Forestry Research Institute35430 IzmirTurkey Department of Wildlife Ecology and Management Faculty of ForestryIsparta University of Applied Science32260 IspartaTurkey Department of Soil Science and Ecology Faculty of ForestryIsparta University of Applied Science32260 IspartaTurkey

Fire severity classifications determine fire damage and regeneration potential in post-fire areas for effective implementation of restoration *** fire damage varies according to vegetation and fire characteristics,regional assessment of fire severity is *** objectives of this study were:(1)to test the performance of different satellite imagery and spectral indices,and two field—measured severity indices,CBI(Composite Burn Index)and GeoCBI(Geometrically structured Composite Burn Index)to assess fire severity;(2)to calculate classification thresholds for spectral indices that performed best in the study areas;and(3)to generate fire severity maps that could be used to determine the ecological impact of forest *** large fires in Pinus brutia(Turkish pine)and Pinus nigra *** ***(Anatolian black pine)—dominated forests during 2020 and 2021 were selected as study *** results show that GeoCBI provided more reliable estimates of field—measured fire severity than *** Sentinel-2 and Landsat-8/OLI images performed similarly well,MODIS performed *** severity classification thresholds were determined for Sentinel-2 based RdNBR,dNBR,dSAVI,dNDVI,and dNDMI and Landsat-8/OLI based dNBR,dNDVI,and *** several spectral indices,the highest accuracy for fire severity classification was found for Sentinel-2 based RdNBR(72.1%)and Landsat-8/OLI based dNBR(69.2%).The results can be used to assess and map fire severity in forest ecosystems similar to those in this study.

关键词： Remote sensing Forest fire Fire severity Spectral indices Composite burn index

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