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In the Context of the Political Economy of Sub-Saharan Africa During the Post-colonial Period: Turkey’s African Investments Example of “Renaissance DAM”

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Economics World 2024年第4期11卷 203-212页

作者： Erkan Oflaz ayhan orhan Kocaeli University KocaeliTürkiye

The strategy implemented by the Republic of Turkey in Sub-Saharan Africa needs to be examined not only in terms of Geopolitics,but also in terms of Political *** this point of view,it is necessary to examine the economic difficulties or advantages that may *** our era,it is still being revealed whether it finds a response in“Hierarchical African policies”and whether“white rule”in Africa can continue *** trade systematics and ranking of the top five countries in Africa’s trade system are also *** most important data is that the will of African people and decision makers not to be“passive”is also *** hypothesis of the article is that the political negotiation process,which will be created under equal conditions,can be organized by increasing commercial *** history and the political structure of Africa have not only a geopolitical point of *** African continent,which was seen as a raw material and human resource during the colonial period,was also subjected to foreign influence in terms of“European Harmony”and other theories of *** role of Africa in the system put forward by Klemens von Metternich is being re-examined by the emerging new powers in the contemporary *** this context,undoubtedly,the thesis“African solutions to Africa’s problems”put forward by Turkey should be considered not only as a point of view,but also as a historical,economic and sociological *** this study,Turkey’s current policies towards sub-Saharan Africa will be discussed on the example of the Renaissance *** policies are needed to avoid increase the welfare of a region?Which ethical processes can be ignoring for conduct by these policies?In order to answer these important questions,a historicity appropriate to the Annales School approach is required in the light of premodern“market”dynamics and social sharing *** aim of the article is to cover the weaknesses and strengths of Turkey’s African

关键词： African geopolitics African economic policy African investments Turkish foreign policy

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Redox active polymer metal chelates for use in flexible symmetrical supercapacitors:Cobalt-containing poly(acrylic acid)polymer electrolytes

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Journal of Energy Chemistry 2021年第4期30卷 145-153页

作者： Emre Cevik ayhan Bozkurt Department of Genetics Research Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia Department of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia

The novel polymer metal chelate electrolytes(polychelates)were prepared by incorporation of cobalt sulfate(Co)into poly(acrylic acid)(PAA)host ***-solid state supercapacitor devices were fabricated using polychelates,PAA-Co X(X:3,5,7,and 10)where X represents the doping fraction(w/w)of Co in *** polymer metal electrolytes were showed excellent bending-stretching properties,thermal stability and electrochemical durability with an optimum ionic conductivity of 3.15×10^(-4) S cm^(-1).Hierarchically porous activated carbon and nano-sized conductive carbon were used to form carbon composite symmetrical device *** electric double-layer capacitor(EDLC)and redox reactions of Co-incorporated polychelates at the interfaces of porous activated carbon provided an optimum specific capacitance of 341.33 F g^(-1) with a device of PAA-Co7,which is at least 15 times enhancement compared to the device of pristine *** PAA-Co7 device also provided energy density of 21.25 Wh kg^(-1) at a power density of 117.69 W kg^(-1).A prolonged cyclic stability of the device exhibited superior capacitive performance after 10,000 charge-discharge cycles and the maintained 90%of its initial *** addition,the supercapacitor with a dimension of 1.5 cm×3 cm containing PAA-Co7 successfully operated the red-blue-green(RGB)LED light.

关键词： Supercapacitor Redox active supercapacitor Cobalt Poly(acrylic acid) Polymer electrolyte

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RELAXED ELASTIC LINES OF SECOND KIND ON ORIENTED SURFACE IN MINKOWSKI SPACE

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Applied Mathematics and Mechanics(English Edition) 2006年第11期27卷 1481-1489页

作者： ayhan TUTAR ayhan SARIO■LUG■L Ondokuz Mayis University Faculty of Science and ArtsDepartment of MathematicsKurupelit-Samsun55139Turkey

The relaxed elastic line of second kind on an oriented surface in the Minkowski space was defined and for the relaxed elastic line of second kind which is lying on an oriented surface the Euler-Lagrange equations were derived. Furthermore, whether these curves lie on a curvature line or not was investigated and some applications were given.

关键词： elastic line geodesic Minkowski space Euler-Lagrange equations

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Perturbing the Stable Accretion Disk in Kerr and 4D Einstein-Gauss-Bonnet Gravities:Comprehensive Analysis of Instabilities and Dynamics

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Research in Astronomy and Astrophysics 2024年第8期24卷 1-19页

作者： orhan Donmez College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait

The study of a disturbed accretion disk holds great significance in the realm of astrophysics,as such events play a crucial role in revealing the nature of disk structure,the release of energy,and the generation of shock ***,they can help explain the causes of X-ray emissions observed in black hole accretion disk *** this paper,we perturb the stable disk formed by spherical accretion around Kerr and Einstein-Gauss-Bonnet(EGB)black *** perturbation reveals one-and two-armed spiral shock waves around the black *** find a strong connection between these waves and the black hole spin parameter(a/M)and the EGB coupling constant(α).Specifically,we find that asαincreases in the negative direction,the dynamics of the disk and the waves become more ***,we observe that the angular momentum of the perturbing matter significantly affects mass accretion and the oscillation of the arising shock *** allows us to observe changes in QPO frequencies,particularly,perturbations with angular momentum matching the observed C-type low-frequency QPOs of the GRS 1915+105 ***,we conclude that the possibility of the occurrence of shock waves within the vicinity of GRS 1915+105 is substantial.

关键词： accretion-accretion disks-black hole physics-hydrodynamics-shock waves-X-rays binaries

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The changing world under the corona virus threat-from human needs to SDGs and what next?

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Geo-Spatial Information Science 2021年第1期24卷 50-57,I0008页

作者： orhan Altan Ian Dowman Department of Geomatics Istanbul Technical UniversityIstanbulTurkey Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondonUK

The COVID-19(coronavirus)disease has affected over 100 countries in a matter of *** way humans live and work on planet Earth has changed profoundly over the last *** lives and livelihoods have been *** of working,shopping,and social interactions are all vastly different for most of *** do not know when the current crisis will end,or how far we will“return”to the way things were before the *** world is experiencing one of the most transformative moments of the last 100 *** social,economic,and political influences of the COVID-19 crisis have already been hugely momentous,we do not utterly understand *** ahead,we have inevitably had to make important public health,economic,governance,and ecological decisions with less information than usual and to reverse recently adopted policies,which can lead to an era of disruptive transformations to *** these historic times,we must understand the hidden reality of the earth system and attempt to transform our needs so that we all have a sustained future on our planet.

关键词： COVID-19 human needs social and scientific response millennium development goals sustainable development goals UN

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Effect of Doping and High-Temperature Annealing on the Structural and Electrical Properties of Zn_(1-X)Ni_XO(0≤X≤0.15) Powders

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Journal of Materials Science & Technology 2011年第10期27卷 944-950页

作者： Hakan olak orhan Trkoglu Department of Chemistry Faculty of ScienceUniversity of Erciyes

This paper reported the synthesis, crystal structure and electrical conductivity properties of Ni-doped ZnO powders （i.e. Zn1-xNixO binary system, X=0, 0.0025, 0.005, 0.0075 and in the range 0.01≤X〈0.15）. I- phase samples, which were indexed as single phase with a hexagonal （wurtzite） structure in the Zn1-xNixO binary system, were determined by X-ray diffraction （XRD）. The widest range of the I-phase was determined as 0≤X≤0.03 at 1200℃; above this range the mixed phase was observed. The impurity phase was determined as NiO when compared with standard XRD data, using the PDF program. We focused on single f-phase ZnO samples which were synthesized at 1200℃ because of the widest range of solubility limit at this temperature. It was observed that the lattice parameters a and c of the I-phase decreased with Ni doping concentration. The morphology of the I-phase samples was analyzed with a scanning electron microscope. The electrical conductivity of the pure ZnO and single I-phase samples were studied by using the four-probe dc method at temperatures between 100 and 950℃ in air atmosphere. The electrical conductivity values of pure ZnO and 3 mol% Ni-doped ZnO samples at 100℃C were 2×10^-6 and 4.8×10^-6 Ω-***^-1, and at 950℃ they were 1.8 and 3.6 Ω-1cm-1, respectively. In other words, electrical conductivity increased with Ni doping concentration.

关键词： Ⅱ-Ⅵ semiconductors Zinc oxide and doped zinc oxide Four point probe method

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Synthesis,Crystal Structural and Electrical Conductivity Properties of Fe-Doped Zinc Oxide Powders at High Temperatures

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Journal of Materials Science & Technology 2012年第3期28卷 268-274页

作者： Hakan Çolak orhan TÜrkoglu Department of Chemistry Science of FacultyUniversity of ErciyesKayseri38039Turkey Deparment of Chemistry Science of FacultyUniversity of C ank r KaratekinBall ca CampusC ank r18200Turkey

The synthesis,crystal structure and electrical conductivity properties of Fe-doped ZnO powders（in the range of 0.25-15 mol%） were reported in this paper.I-phase samples,which were indexed as single phase with a hexagonal（wurtzite） structure in the Fe-doped ZnO binary system,were determined by X-ray diffraction（XRD）.The solubility limit of Fe in the ZnO lattice is 3 mol% at 950℃.The above mixed phase was *** the impurity phase was determined as the cubic-ZnFe 2 O 4 phase when compared with standard XRD data using the PDF *** study focused on single I-phase ZnO samples which were synthesized at 950℃ because the limit of the solubility range is the widest at this *** lattice parameters a and c of the I-phase decreased with Fe-doping *** morphology of the I-phase samples was analyzed with a scanning electron *** grain size of the I-phase samples increased with heat treatment and doping *** electrical conductivity of the pure ZnO and single I-phase samples was investigated using the four-probe dc method at 100-950℃ in air *** electrical conductivity values of pure ZnO,0.25 and 3 mol% Fe-doped ZnO samples at 100℃ were 2×10-6,1.7×10-3 and 6.3×10-4 ***-1,and at 950℃ they were 3.4,8.5 and 4 ***-1,respectively.

关键词： II-VI semiconductors Zinc oxide and doped zinc oxide Four point probe method

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On Weighted Estimates of High-Order Riesz-Bessel Transformations Generated by the Generalized Shift Operator

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Acta Mathematica Sinica,English Series 2005年第1期21卷 53-64页

作者： Isman EKINCIOGLU ayhan SERBETCI Department Department of Mathematics Ankara University06100 Tandogan-AnkaraTurkey

In this paper, we establish sufficient conditions on weights which ensurethat high-order Riesz-Bessel transformations generated by the generalized shift operator actboundedly from one weighted L_p-space into another.

关键词： Generalized shift operator Riesz-Bessel transformations

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Effect of thermal treatment on the swelling and surface roughness of common alder and wych elm wood

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Journal of Forestry Research 2016年第1期27卷 225-229页

作者： ayhan Aytin Suleyman Korkul Program of Furniture and Decoration Duzce Vocational School Duzce University Diizce Turkey Department of Forest Industry Engineering Faculty of Forestry Duzce University Diizce Turkey

Wood heat treatment has increased signifi- cantly in recent years and is still growing as an industrial process to improve some wood properties. We studied the change of swellingand surface roughness of common alder （Alnus glutinosa （L.） Gaertn. ***） and wych elm （Ulmus glabra Huds.） woods after heat treatment at two different temperatures and durations. The temperatures were 180 and 200 ℃ and the durations were 2 and 4 h. A stylus method was employed to evaluate the surface char- acteristics of the samples. Roughness measurements by the stylus method were made in the direction perpendicular to the fiber on the wood surface. Four main roughness parameters, mean arithmetic deviation of profile （Ra）, mean peak-to-valley height （Rz）, root mean square roughness （Rq）, and maximum roughness （Ry） were used to evaluate the effect of heat treatment on the surface characteristics of the specimens. Swelling and surface roughness parameters （Ra, Rz, Ry, and Rq） differed significantly for two temper- atures and two durations of heat treatment. Swelling and surface roughness values decreased with increasing treat- ment temperature and treatment times.

关键词： Heat treatment Swelling Surfaceroughness. Common alder Wych elm

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A review of the day-ahead natural gas consumption in Denmark:starting point towards forecasting accuracy improvement

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International Journal of Coal Science & Technology 2021年第1期8卷 1-22页

作者： orhan AltuğKarabiber George Xydis Department of Business Development and Technology Aarhus UniversityBirk Centerpark 157400HerningDenmark

Natural gas consumption forecasting is crucial for transmission system operators,distribution system operators,traders,and other players in the *** work collects natural gas forecasting scientific works in accordance with the forecasting tool used by Energinet,the Danish transmission system *** work provides an analytical description on the long-term stability and security of the natural gas transmission system in *** work offers a detailed scientific directory on natural gas forecasting,presenting the so far vaguely described market in a more structured *** paper was focused on presenting the latest findings on identifying the selection each time of the appropriate prognostic model for each application based on:①the option for supporting double seasonality,②various exogenous variables,③suitability for day-ahead forecasting,and④ease of use and all these versus Energinet’s current model.

关键词： Natural gas Forecasting Natural gas supply chain Gas infrastructure

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