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188 results on '"Karadeniz, S."'

10. Frequency dependent dielectric spectroscopy of Au/n-Si structure with stannic oxide (SnO2) interfacial layer.

Author

Karadeniz, S. and Yıldız, D. E.

Abstract

This study investigated the frequency dependent dielectric spectrum of Au/Si structures in which stannic oxide (SnO2) films formed by spin coating technique on silicon substrate were used as interface. Surface morphological examination of interfacial layer was made by atomic force microscopy and scanning electron microscope. The analyzes revealed a uniform and low surface roughness of 2.66 nm, which is important for high performance applications. Capacitance-frequency (C–f) and conductance-frequency (G/w–f) analysis techniques were used to characterize the produced devices. For this purpose, measurements were made at 1–1000 kHz frequency range and dc voltages between − 0.5 and 6.0 V with steps of 0.02 V. All measurement processes were performed at room temperature and under dark environment. The Complex impedance Cole–Cole plots showed the relaxation behavior as non-Debye type. The contribution of grain and grain boundary to conductance was predicted. Module analysis showed that the electrical transport in the material was in the form of a hopping mechanism. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Urogynecology

Author

Petri E., Niemeyer R., Petri E., Niemeyer R., Sivaslioglu A. A., Haberal A., Dölen I., Dede H., Akkök E., Deveci S., Demir B., Aksakal O., Ugur M., Yilmaz B., Yesilyurt H., Mollamahmutoglu L., Sivaslioglu A. A., Elhan A., Sakul U., Dölen I., Tunc E., Ercan F., Haberal A., Aksakal O., Tuncay G., Aytan H., Tapisiz O. L., Bilge U., Mollamahmutoglu L., Aksakal O., Tuncay G., Bal S., Bilge U., Tapisiz O. L., Mollamahmutoglu L., Unlu S., Aksakal O., Tapisiz O. L., Tuncay G., Aytan H., Ugur M., Bilge U., Mollamahmutoglu L., Yasar L., Yazicioglu F., Efe C., Sönmez S., Zebitay A. G., Süt N., Sensoy Y., Cebi Z., Bayrak O., Cimentepe E., Gümüs I. I., Dede H., Sivaslioglu A., Dolen I., Dede F. S., Seckin L., Haberal A., Sivaslioglu A. A., Dolen I., Dede H., Dilbaz S., Demir B., Sümer C., Gelisen O., Unlubilgin E., Deveci S., Dede S., Seckin L., Haberal A., Dönmez M. D., Atis A., Aydin Y., Tandogan T., Ozpak D., Oruc O., Aksakal O. S., Doganay M., Aytan H., Gungor T., Bal S., Bilge U., Mollamahmutoglu L., Ozdegirmenci O., Dede F. S., Haberal A., Karslioglu Y., Karadeniz S., and Gunhan O.

Published
2005
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22. The development of upper bound and associated finite element techniques for the plastic shakedown of thermally loaded structures

Author

Karadeniz, S.

Subjects
620
Abstract

This thesis is concerned with the behaviour of structures subjected to cyclic or repeated thermal loading in the presence of steady mechanical loads. The present work consists of four main parts; in the first part, the thermal loading problems and the possible solution methods are discussed. The development of shakedown theory and its applications are reviewed with particular attention on the case of thermal actions. By utilising the upper bound shakedown theorem and assuming a broader range of shakedown conditions, a new extended upper bound technique for estimating the extent of plastic shakedown (reversed plasticity) region is developed. The occurrence of the structural and material shakedown and a related structural theory which indicates whether a reversed plasticity region exists, are discussed. In the second part, the influence of cyclic hardening and temperature dependents of material properties on the modes of behaviour of two representative kinematically determinate structures; namely a parallel two-bar assembly and a Bree plate are investigated by means of an empirical cyclic hardening material model and the theory, developed in the first part. Comparing the available experimental data on a two-bar structure with the predictions of perfect plasticity, complete cyclic and cyclic hardening models it is argued that the use of perfect plasticity model may not -always guarantee the safe performance above the shakedown limits. In this region the use of complete cyclic hardening model gives conservative boundary whereas the cyclic hardening model gives the most appropriate boundary. The analytical solutions for the Bree plate with temperature independent material properties show that the boundary between the reversed plasticity and ratchetting is insensitive to the hardening assumption. The influence of the transient thermal loading and the effects of multi-axial state of stress on the Bree solution are also studied. The applications of the upper bound technique to the problems involving transverse and in plane loading in plates are presented and the importance of the shear stresses in this type of loading conditions are emphasized. In the third part, a finite element technique for the computing of shakedown limits and estimation of the corresponding mechanisms of deformation for kinematically highly indeterminate structures is developed. Presenting the main features of the technique which is based upon the upper bound shakedown theorem and linear programming, a number of solutions are given to specific problems to illustrate the types of problems which may be solved by the technique. Some recently reported experimental data on a tube under axisymmetrical loading is compared with the present analytical predictions. Finally, the conclusions and the proposals for future work are presented in the fourth part.

Published
1983

31. Facile growth of high transmittance ZnO micro-rod clusters on indium tin oxide by a wet-chemical synthesis method.

Author

Karadeniz, S. Morkoç

Subjects
ZINC oxide, INDIUM tin oxide, CHEMICAL synthesis, X-ray diffraction, SCANNING electron microscopy
Abstract

A simple wet-chemical synthesis method was developed to fabricate Zinc oxide micro-rod clusters. The synthesis process involved the rapid dilution of a zinc-bearing alkaline solution at 150°C in a convection oven on indium tin oxide (ITO) substrates. The synthesis was carried out by immersing an unseeded ITO substrate in a mixture of zinc nitrate hexahydrate (Zn(NO3)2·6H2O) and hexamethylenetetramine ((CH2)6N4) aqueous solution. The obtained sample was annealed at 400°C for 2 h. The structural, morphological and optical properties of the synthesized ZnO microstructures were investigated by X-ray diffraction, scanning electron microscopy and ultraviolet-visible spectroscopy, respectively. The ZnO rod clusters are hexagonal phase of the wurtzite structure. The crystal grain sizes of the films were found to be 72.6, 84.3 and 66.3 nm for the (100), (002) and (101) crystal planes, respectively. The optical bandgap of the ZnO was determined to be 3.147 eV. [ABSTRACT FROM AUTHOR]

Published
2021
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35. Microbial adherence to a nonprecious alloy after plasma nitriding process.

Author

Sonugelen M, Destan UI, Lambrecht FY, Öztürk B, and Karadeniz S

Abstract

PURPOSE: To investigate the microbial adherence to the surfaces of a nonprecious metal alloy after plasma nitriding. MATERIALS AND METHODS: The plasma-nitriding process was performed to the surfaces of metals prepared from a nickel-chromium alloy. The microorganisms were labeled with technetium-99m. After the labeling procedure, 60 metal disks were treated with a microorganism for each use. RESULTS: The results revealed that the amount of adherence of all microorganisms on surfaces was changed by plasma-nitriding process; adherence decreased substantially (P < .05) and the differences in plasma nitriding time were not significant (P> .05) CONCLUSION: With the plasma-nitriding process, the surface properties of nonprecious metal alloys can be changed, leading to decreased microbial adherence. [ABSTRACT FROM AUTHOR]

Published
2006

36. A European evidence-based guideline for the prevention of type 2 diabetes

Author

Paulweber, B. Valensi, P. Lindström, J. Lalic, N.M. Greaves, C.J. McKee, M. Kissimova-Skarbek, K. Liatis, S. Cosson, E. Szendroedi, J. Sheppard, K.E. Charlesworth, K. Felton, A.-M. Hall, M. Rissanen, A. Tuomilehto, J. Schwarz, P.E. Roden, M. Paulweber, M. Stadlmayr, A. Kedenko, L. Katsilambros, N. Makrilakis, K. Kamenov, Z. Evans, P. Gilis-Januszewska, A. Lalic, K. Jotic, A. Djordevic, P. Dimitrijevic-Sreckovic, V. Hühmer, U. Kulzer, B. Puhl, S. Lee-Barkey, Y.H. Alkerwi, A. Abraham, C. Hardeman, W. Acosta, T. Adler, M. Barengo, N. Barengo, R. Boavida, J.M. Charlesworth, K. Christov, V. Claussen, B. Cos, X. Cosson, E. Deceukelier, S. Dimitrijevic-Sreckovic, V. Djordjevic, P. Evans, P. Felton, A.-M. Fischer, M. Gabriel-Sanchez, R. Gilis-Januszewska, A. Goldfracht, M. Gomez, J.L. Hall, M. Handke, U. Hauner, H. Herbst, J. Hermanns, N. Herrebrugh, L. Huber, C. Hühmer, U. Huttunen, J. Jotic, A. Kamenov, Z. Karadeniz, S. Katsilambros, N. Khalangot, M. Kissimova-Skarbek, K. Köhler, D. Kopp, V. Kronsbein, P. Kulzer, B. Kyne-Grzebalski, D. Lalic, K. Lalic, N. Landgraf, R. Lee-Barkey, Y.H. Liatis, S. Lindström, J. Makrilakis, K. McIntosh, C. McKee, M. Mesquita, A.C. Misina, D. Muylle, F. Neumann, A. Paiva, A.C. Pajunen, P. Paulweber, B. Peltonen, M. Perrenoud, L. Pfeiffer, A. Pölönen, A. Puhl, S. Raposo, F. Reinehr, T. Rissanen, A. Robinson, C. Roden, M. Rothe, U. Saaristo, T. Scholl, J. Schwarz, P.E. Sheppard, K.E. Spiers, S. Stemper, T. Stratmann, B. Szendroedi, J. Szybinski, Z. Tankova, T. Telle-Hjellset, V. Terry, G. Tolks, D. Toti, F. Tuomilehto, J. Undeutsch, A. Valadas, C. Valensi, P. Velickiene, D. Vermunt, P. Weiss, R. Wens, J. Yilmaz, T. and Paulweber, B. Valensi, P. Lindström, J. Lalic, N.M. Greaves, C.J. McKee, M. Kissimova-Skarbek, K. Liatis, S. Cosson, E. Szendroedi, J. Sheppard, K.E. Charlesworth, K. Felton, A.-M. Hall, M. Rissanen, A. Tuomilehto, J. Schwarz, P.E. Roden, M. Paulweber, M. Stadlmayr, A. Kedenko, L. Katsilambros, N. Makrilakis, K. Kamenov, Z. Evans, P. Gilis-Januszewska, A. Lalic, K. Jotic, A. Djordevic, P. Dimitrijevic-Sreckovic, V. Hühmer, U. Kulzer, B. Puhl, S. Lee-Barkey, Y.H. Alkerwi, A. Abraham, C. Hardeman, W. Acosta, T. Adler, M. Barengo, N. Barengo, R. Boavida, J.M. Charlesworth, K. Christov, V. Claussen, B. Cos, X. Cosson, E. Deceukelier, S. Dimitrijevic-Sreckovic, V. Djordjevic, P. Evans, P. Felton, A.-M. Fischer, M. Gabriel-Sanchez, R. Gilis-Januszewska, A. Goldfracht, M. Gomez, J.L. Hall, M. Handke, U. Hauner, H. Herbst, J. Hermanns, N. Herrebrugh, L. Huber, C. Hühmer, U. Huttunen, J. Jotic, A. Kamenov, Z. Karadeniz, S. Katsilambros, N. Khalangot, M. Kissimova-Skarbek, K. Köhler, D. Kopp, V. Kronsbein, P. Kulzer, B. Kyne-Grzebalski, D. Lalic, K. Lalic, N. Landgraf, R. Lee-Barkey, Y.H. Liatis, S. Lindström, J. Makrilakis, K. McIntosh, C. McKee, M. Mesquita, A.C. Misina, D. Muylle, F. Neumann, A. Paiva, A.C. Pajunen, P. Paulweber, B. Peltonen, M. Perrenoud, L. Pfeiffer, A. Pölönen, A. Puhl, S. Raposo, F. Reinehr, T. Rissanen, A. Robinson, C. Roden, M. Rothe, U. Saaristo, T. Scholl, J. Schwarz, P.E. Sheppard, K.E. Spiers, S. Stemper, T. Stratmann, B. Szendroedi, J. Szybinski, Z. Tankova, T. Telle-Hjellset, V. Terry, G. Tolks, D. Toti, F. Tuomilehto, J. Undeutsch, A. Valadas, C. Valensi, P. Velickiene, D. Vermunt, P. Weiss, R. Wens, J. Yilmaz, T.

Abstract

Background: The prevalence and socioeconomic burden of type 2 diabetes (T2DM) and associated co-morbidities are rising worldwide. Aims: This guideline provides evidence-based recommendations for preventing T2DM. Methods: A European multidisciplinary consortium systematically reviewed the evidence on the effectiveness of screening and interventions for T2DM prevention using SIGN criteria. Results: Obesity and sedentary lifestyle are the main modifiable risk factors. Age and ethnicity are non-modifiable risk factors. Case-finding should follow a step-wise procedure using risk questionnaires and oral glucose tolerance testing. Persons with impaired glucose tolerance and/or fasting glucose are at high-risk and should be prioritized for intensive intervention. Interventions supporting lifestyle changes delay the onset of T2DM in high-risk adults (number-needed-to-treat: 6.4 over 1.84.6 years). These should be supported by inter-sectoral strategies that create health promoting environments. Sustained body weight reduction by 5% lowers risk. Currently metformin, acarbose and orlistat can be considered as second-line prevention options. The population approach should use organized measures to raise awareness and change lifestyle with specific approaches for adolescents, minorities and disadvantaged people. Interventions promoting lifestyle changes are more effective if they target both diet and physical activity, mobilize social support, involve the planned use of established behaviour change techniques, and provide frequent contacts. Cost-effectiveness analysis should take a societal perspective. Conclusions: Prevention using lifestyle modifications in high-risk individuals is cost-effective and should be embedded in evaluated models of care. Effective prevention plans are predicated upon sustained government initiatives comprising advocacy, community support, fiscal and legislative changes, private sector engagement and continuous media communication. © Georg Thieme Verla

Published
2010

38. Determination of the most appropriate surgical treatment in syndesmotic injury of ankle joint: Application of Taguchi method.

Author

Göçer, H., Çirakli, A., Uğur, L., Yildiz, A., and Karadeniz, S.

Subjects
TAGUCHI methods, ANKLE injury treatment, FINITE element method, OPERATIVE surgery, FRACTURE fixation
Abstract

Background: Ankle injuries are more frequently observed in youth and athletes, and may lead to permanent disabilities if not treated properly. Approximately 10% of ankle injuries are associated with syndesmotic ligament injuries and fixation with screw is frequently applied as surgical treatment. The present study we aimed to determine the most proper model and model parameters by evaluating the minimum equivalent von Mises stress value developed in syndesmotic fixation of the ankle. Methods: By modeling the normal lower extremity in a healthy subject via the finite element analysis (FEA) method, we compared stress developed in a normal standing position in the models of syndesmotic injuries approached by frequently used cortical screws of various lengths and diameters, and by considering the number of screws and localization of fixation. Tibia, fibula, talus, and calcaneus were modeled as a three dimensional (3D) solid model via images of computerized tomography (CT), using the MIMICS program (version 10.01). The obtained 3D model was saved in the MIMICS program in STL (steriolithography) format, and transferred to the Geomagic Studio (version 10) program. Essential corrections were applied to the bones with the aid of the Geomagic program. The model of lower extremity designed was transferred to the Solidworks (version 2014) program in IGES (Initial Graphics Exchange Specification) format, and thus the meniscus and cartilage were modeled. Tensions that developed in the ankle were calculated after forming a mesh pattern via the ANSYS Workbench (version 15.0) software. Results: Sixteen different models obtained were analyzed by the Taguchi method, and the most appropriate models and model parameters were indicated by determining the minimum equivalent von Mises stress value. Conclusion: Screw diameter was determined to be the most important parameter. When 16 different models were considered, a screw diameter of 4.5 mm and threecortex fixation with two screws parallel to the tibial joint surface were found to produce the most convenient model. [ABSTRACT FROM AUTHOR]

Published
2017
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41. Take Action to Prevent Diabetes – The IMAGE Toolkit for the Prevention of Type 2 Diabetes in Europe

Author

Lindström, J., primary, Neumann, A., additional, Sheppard, K., additional, Gilis-Januszewska, A., additional, Greaves, C., additional, Handke, U., additional, Pajunen, P., additional, Puhl, S., additional, Pölönen, A., additional, Rissanen, A., additional, Roden, M., additional, Stemper, T., additional, Telle-Hjellset, V., additional, Tuomilehto, J., additional, Velickiene, D., additional, Schwarz, P., additional, Acosta, T., additional, Adler, M., additional, AlKerwi, A., additional, Barengo, N., additional, Barengo, R., additional, Boavida, J., additional, Charlesworth, K., additional, Christov, V., additional, Claussen, B., additional, Cos, X., additional, Cosson, E., additional, Deceukelier, S., additional, Dimitrijevic-Sreckovic, V., additional, Djordjevic, P., additional, Evans, P., additional, Felton, A.-M., additional, Fischer, M., additional, Gabriel-Sanchez, R., additional, Goldfracht, M., additional, Gomez, J., additional, Hall, M., additional, Hauner, H., additional, Herbst, J., additional, Hermanns, N., additional, Herrebrugh, L., additional, Huber, C., additional, Hühmer, U., additional, Huttunen, J., additional, Jotic, A., additional, Kamenov, Z., additional, Karadeniz, S., additional, Katsilambros, N., additional, Khalangot, M., additional, Kissimova-Skarbek, K., additional, Köhler, D., additional, Kopp, V., additional, Kronsbein, P., additional, Kulzer, B., additional, Kyne-Grzebalski, D., additional, Lalic, K., additional, Lalic, N., additional, Landgraf, R., additional, Lee-Barkey, Y., additional, Liatis, S., additional, Lindström, J., additional, Makrilakis, K., additional, McIntosh, C., additional, McKee, M., additional, Mesquita, A., additional, Misina, D., additional, Muylle, F., additional, Paiva, A., additional, Paulweber, B., additional, Peltonen, M., additional, Perrenoud, L., additional, Pfeiffer, A., additional, Raposo, F., additional, Reinehr, T., additional, Robinson, C., additional, Rothe, U., additional, Saaristo, T., additional, Scholl, J., additional, Spiers, S., additional, Stratmann, B., additional, Szendroedi, J., additional, Szybinski, Z., additional, Tankova, T., additional, Terry, G., additional, Tolks, D., additional, Toti, F., additional, Undeutsch, A., additional, Valadas, C., additional, Valensi, P., additional, Vermunt, P., additional, Weiss, R., additional, Wens, J., additional, and Yilmaz, T., additional

Published
2010
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42. Quality Indicators for the Prevention of Type 2 Diabetes in Europe – IMAGE

Author

Pajunen, P., primary, Landgraf, R., additional, Muylle, F., additional, Neumann, A., additional, Lindström, J., additional, Schwarz, P., additional, Peltonen, M., additional, Acosta, T., additional, Adler, M., additional, AlKerwi, A., additional, Barengo, N., additional, Barengo, R., additional, Boavida, J., additional, Charlesworth, K., additional, Christov, V., additional, Claussen, B., additional, Cos, X., additional, Cosson, E., additional, Deceukelier, S., additional, Dimitrijevic-Sreckovic, V., additional, Djordjevic, P., additional, Evans, P., additional, Felton, A.-M., additional, Fischer, M., additional, Gabriel-Sanchez, R., additional, Gilis-Januszewska, A., additional, Goldfracht, M., additional, Gomez, J., additional, Greaves, C., additional, Hall, M., additional, Handke, U., additional, Hauner, H., additional, Herbst, J., additional, Hermanns, N., additional, Herrebrugh, L., additional, Huber, C., additional, Hühmer, U., additional, Huttunen, J., additional, Jotic, A., additional, Kamenov, Z., additional, Karadeniz, S., additional, Katsilambros, N., additional, Khalangot, M., additional, Kissimova-Skarbek, K., additional, Köhler, D., additional, Kopp, V., additional, Kronsbein, P., additional, Kulzer, B., additional, Kyne-Grzebalski, D., additional, Lalic, K., additional, Lalic, N., additional, Lee-Barkey, Y., additional, Liatis, S., additional, Makrilakis, K., additional, McIntosh, C., additional, McKee, M., additional, Mesquita, A., additional, Misina, D., additional, Paiva, A., additional, Pajunen, P., additional, Paulweber, B., additional, Perrenoud, L., additional, Pfeiffer, A., additional, Pölönen, A., additional, Puhl, S., additional, Raposo, F., additional, Reinehr, T., additional, Rissanen, A., additional, Robinson, C., additional, Roden, M., additional, Rothe, U., additional, Saaristo, T., additional, Scholl, J., additional, Sheppard, K., additional, Spiers, S., additional, Stemper, T., additional, Stratmann, B., additional, Szendroedi, J., additional, Szybinski, Z., additional, Tankova, T., additional, Telle-Hjellset, V., additional, Terry, G., additional, Tolks, D., additional, Toti, F., additional, Tuomilehto, J., additional, Undeutsch, A., additional, Valadas, C., additional, Valensi, P., additional, Velickiene, D., additional, Vermunt, P., additional, Weiss, R., additional, Wens, J., additional, and Yilmaz, T., additional

Published
2010
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43. A European Evidence-Based Guideline for the Prevention of Type 2 Diabetes

Author

Paulweber, B., primary, Valensi, P., additional, Lindström, J., additional, Lalic, N., additional, Greaves, C., additional, McKee, M., additional, Kissimova-Skarbek, K., additional, Liatis, S., additional, Cosson, E., additional, Szendroedi, J., additional, Sheppard, K., additional, Charlesworth, K., additional, Felton, A.-M., additional, Hall, M., additional, Rissanen, A., additional, Tuomilehto, J., additional, Schwarz, P., additional, Roden, M., additional, Paulweber, M., additional, Stadlmayr, A., additional, Kedenko, L., additional, Katsilambros, N., additional, Makrilakis, K., additional, Kamenov, Z., additional, Evans, P., additional, Gilis-Januszewska, A., additional, Lalic, K., additional, Jotic, A., additional, Djordevic, P., additional, Dimitrijevic-Sreckovic, V., additional, Hühmer, U., additional, Kulzer, B., additional, Puhl, S., additional, Lee-Barkey, Y., additional, AlKerwi, A., additional, Abraham, C., additional, Hardeman, W., additional, Acosta, T., additional, Adler, M., additional, Barengo, N., additional, Barengo, R., additional, Boavida, J., additional, Christov, V., additional, Claussen, B., additional, Cos, X., additional, Deceukelier, S., additional, Djordjevic, P., additional, Fischer, M., additional, Gabriel-Sanchez, R., additional, Goldfracht, M., additional, Gomez, J., additional, Handke, U., additional, Hauner, H., additional, Herbst, J., additional, Hermanns, N., additional, Herrebrugh, L., additional, Huber, C., additional, Huttunen, J., additional, Karadeniz, S., additional, Khalangot, M., additional, Köhler, D., additional, Kopp, V., additional, Kronsbein, P., additional, Kyne-Grzebalski, D., additional, Landgraf, R., additional, McIntosh, C., additional, Mesquita, A., additional, Misina, D., additional, Muylle, F., additional, Neumann, A., additional, Paiva, A., additional, Pajunen, P., additional, Paulweber, B., additional, Peltonen, M., additional, Perrenoud, L., additional, Pfeiffer, A., additional, Pölönen, A., additional, Raposo, F., additional, Reinehr, T., additional, Robinson, C., additional, Rothe, U., additional, Saaristo, T., additional, Scholl, J., additional, Spiers, S., additional, Stemper, T., additional, Stratmann, B., additional, Szybinski, Z., additional, Tankova, T., additional, Telle-Hjellset, V., additional, Terry, G., additional, Tolks, D., additional, Toti, F., additional, Undeutsch, A., additional, Valadas, C., additional, Velickiene, D., additional, Vermunt, P., additional, Weiss, R., additional, Wens, J., additional, and Yilmaz, T., additional

Published
2010
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