Pekcan, Mehmet Önder
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Mehmet Onder Pekcan
Mehmet Onder, Pekcan
Mehmet Önder Pekcan
Pekcan ö.
P., Mehmet Önder
Pekcan, MEHMET ÖNDER
Pekcan,Mehmet Onder
Pekcan, M. Ö.
Mehmet Önder PEKCAN
P., Mehmet Onder
PEKCAN, Mehmet Önder
Pekcan, Mehmet Onder
Pekcan,M.Ö.
M. Ö. Pekcan
MEHMET ÖNDER PEKCAN
M. Pekcan
Pekcan, M.
PEKCAN, MEHMET ÖNDER
PEKCAN Ö.
Pekcan N.
Pekcan Ö.
Pekcan, Mehmet Önder
Pekcan O.
P.,Mehmet Onder
Pekcan,M.O.
Pekcan, Önder
Pekcan, Onder
Pekcan, Oonder
Mehmet Onder, Pekcan
Mehmet Önder Pekcan
Pekcan ö.
P., Mehmet Önder
Pekcan, MEHMET ÖNDER
Pekcan,Mehmet Onder
Pekcan, M. Ö.
Mehmet Önder PEKCAN
P., Mehmet Onder
PEKCAN, Mehmet Önder
Pekcan, Mehmet Onder
Pekcan,M.Ö.
M. Ö. Pekcan
MEHMET ÖNDER PEKCAN
M. Pekcan
Pekcan, M.
PEKCAN, MEHMET ÖNDER
PEKCAN Ö.
Pekcan N.
Pekcan Ö.
Pekcan, Mehmet Önder
Pekcan O.
P.,Mehmet Onder
Pekcan,M.O.
Pekcan, Önder
Pekcan, Onder
Pekcan, Oonder
Job Title
Prof. Dr.
Email Address
Main Affiliation
Molecular Biology and Genetics
Status
Former Staff
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Scopus Author ID
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Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
17
PARTNERSHIPS FOR THE GOALS
0
Research Products
14
LIFE BELOW WATER
0
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
15
LIFE ON LAND
0
Research Products
1
NO POVERTY
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
0
Research Products
6
CLEAN WATER AND SANITATION
3
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
0
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
3
Research Products
3
GOOD HEALTH AND WELL-BEING
10
Research Products
2
ZERO HUNGER
0
Research Products
4
QUALITY EDUCATION
0
Research Products
10
REDUCED INEQUALITIES
0
Research Products
13
CLIMATE ACTION
0
Research Products
5
GENDER EQUALITY
0
Research Products
Documents
377
Citations
4718
h-index
35
Documents
388
Citations
4770
Scholarly Output
125
Articles
110
Views / Downloads
719/11569
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
1093
Scopus Citation Count
1148
WoS h-index
16
Scopus h-index
16
Patents
0
Projects
0
WoS Citations per Publication
8.74
Scopus Citations per Publication
9.18
Open Access Source
70
Supervised Theses
0
| Journal | Count |
|---|---|
| Journal of Macromolecular Science, Part B | 10 |
| Phase Transitions | 8 |
| Polymer Composites | 8 |
| Polymer Bulletin | 7 |
| Progress in Organic Coatings | 6 |
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125 results
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Now showing 1 - 10 of 125
Article Citation - WoS: 1Citation - Scopus: 2Group Behaviour in Physical Chemical and Biological Systems(Indıan Acad Scıences, 2014) Saçlıoğlu, Cihan; Pekcan, Önder; Nanjundiah, VidyanandGroups exhibit properties that either are not perceived to exist or perhaps cannot exist at the individual level. Such 'emergent' properties depend on how individuals interact both among themselves and with their surroundings. The world of everyday objects consists of material entities. These are ultimately groups of elementary particles that organize themselves into atoms and molecules occupy space and so on. It turns out that an explanation of even the most commonplace features of this world requires relativistic quantum field theory and the fact that Planck's constant is discrete not zero. Groups of molecules in solution in particular polymers ('sols') can form viscous clusters that behave like elastic solids ('gels'). Sol-gel transitions are examples of cooperative phenomena. Their occurrence is explained by modelling the statistics of inter-unit interactions: the likelihood of either state varies sharply as a critical parameter crosses a threshold value. Group behaviour among cells or organisms is often heritable and therefore can evolve. This permits an additional typically biological explanation for it in terms of reproductive advantage whether of the individual or of the group. There is no general agreement on the appropriate explanatory framework for understanding group-level phenomena in biology.Article Citation - WoS: 4Citation - Scopus: 5Kinetic Models for the Dynamical Behavior of Polyacrylamide (paam)-Kappa (kappa C) Composite Gels(Springer, 2015) Evingür, Gülşen Akın; Pekcan, ÖnderA fluorescence method was employed for studying the drying and swelling of PAAm-kappa C composite gels which were formed from acrylamide (AAm) and N N'- methylenebisacrylamide (BIS) with various kappa-carrageenan (kappa C) contents by free radical crosslinking copolymerization in water. Composite gels were prepared at 80 A degrees C with pyranine (Py) as a fluorescence probe. Scattered light I (sc) and fluorescence emission intensities I (em) were monitored during drying and swelling of these gels. The fluorescence intensity of pyranine increased and decreased as drying and swelling time are increased respectively for all gel samples. The Stern-Volmer equation combined with moving boundary and Li-Tanaka models were used to explain the behavior of I (em) during drying and swelling processes respectively. It is found that the desorption coefficient D (d) decreased as kappa C contents were increased for a given temperature during drying. However the cooperative diffusion coefficient D (s) presented exactly the opposite case. Conventional gravimetrical and volumetric experiments were also carried out during drying and swelling of PAAm-kappa C composite gels. It was observed that D (d) and D (s) values measured with the fluorescence method were found to be much larger than they were measured with the conventional methods.Article Citation - WoS: 4Citation - Scopus: 4Temperature Effect on the Elasticity of Acrylamide-N Copolymers(Taylor & Francis Inc, 2018) Evingür, Gülşen Akin; Pekcan, ÖnderAcrylamide (AAm) - N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with various weight percentages (wt%) of AAm and NIPA. The temperature dependence of the compressive elastic modulus G and toughness U-TU- of the PAAm- NIPA copolymers due to a volume phase transition was found using a compressive testing technique. It was observed that the compressive elastic modulus increased comprehensively when the temperature was increased between 30 degrees C and 60 degrees C. The PAAm- NIPA copolymers presented higher values of the compressive elastic modulus than pure NIPA above the lower critical solution temperature (LCST) (NIPA exhibits a volume phase transition from hydrophilic to hydrophobic in water at 31 degrees C) and their compressive elastic modulus and toughness had a strong temperature dependence.Article Citation - WoS: 3Citation - Scopus: 3Optical and Mechanical Properties of Pnipam-Mwcnts and Pnipam-Go Composites(Wiley, 2023) Unver, Batuhan; Pekcan, Onder; Evingur, Gulsen Akin; Akın Evingür, GülşenThe aim of this study is to investigate drying, swelling, elastic properties, and to produce optical band gap energies on the performance of Poly (N-Isopropyl acrylamide) - Multi walled carbon nanotubes (PNIPAm - MWCNTs) and Poly (N-Isopropyl acrylamide)- Graphene Oxide (PNIPAm-GO) composites, respectively. The composites were prepared by free radical crosslinking copolymerization. Drying and swelling of PNIPAm-MWCNTs and PNIPAm- GO composites were performed by using steady state fluorescence technique. Firstly, the desorption coefficients of the composites were modeled by using Fick's Law. Cooperative diffusion coefficients were calculated by employing Li-Tanaka Model. When composite doped with 10 wt% of MWCNTs has a higher desorption coefficient than composite doped with the same amount of GO, 40wt% of GO content in the PNIPAm has a higher diffusion coefficient than the composite that has 40wt% of MWCNTs content in the swelling process. Secondly, the composite that has 40wt% of MWCNTs content has a higher modulus before swelling than the composite that has the same amount of GO contents. Lastly, optical band gap energies were calculated by using Tauc's approach, and Urbach's relation by using the data performed UV Spectroscopy. We found that PNIPAm -GO has a much narrower band gap value.Article Citation - WoS: 1Citation - Scopus: 2Swelling Kinetics of Paam-Kappa Composites: a Fluorescence Technique(Taylor & Francis Inc, 2011) Evingür, Gülşen Akın; Pekcan, ÖnderThe steady-state fluorescence (SSF) technique was introduced for studying swelling of disc-shaped polyacrylamide (PAAm) gels containing various amount of kappa-carrageenan (kappa C). They were prepared by free-radical cross-linking copolymerization. N N'-methylenebisacrylamide (BIS) and ammonium persulfate (APS) were added as a crosslinker and an initiator respectively. Composite gels were prepared at 80 degrees C with pyranine as a fluorescence probe. After drying of these gels swelling kinetics were performed in water at 60 degrees C by real-time monitoring of the pyranine fluorescence intensity I which decreased as swelling proceeded. The Li-Tanaka equation was used to determine the swelling time constants tau(1) and cooperative diffusion coefficients D(0) from fluorescence intensity weight and volume variations of the gels during the swelling processes in all cases. It was observed that tau(1) decreased and D(0) increased as the kappa C concentrations in the composites were increased indicating that high kappa C gels swell faster than low kappa C gels.Article Citation - Scopus: 3Stock Price Forecasting Through Symbolic Dynamics and State Transition Graphs With a Convolutional Recurrent Neural Network Architecture(Springer Science and Business Media Deutschland GmbH, 2025) Mirza, F.K.; Pekcan, Ö.; Hekimoğlu, M.; Baykaş, T.Accurate stock price forecasting remains a critical challenge in financial analytics due to volatile market conditions, non-stationary dynamics, and abrupt regime shifts that often defy traditional modeling techniques. This study proposes a comprehensive framework for stock price forecasting that integrates symbolic dynamics, graph-based state representations, and deep learning. By converting continuous-valued stock prices into discrete symbolic states representing amplitude and trend information, the method constructs transition matrices capturing probabilistic relationships within financial time series. These transition matrices are then processed by a convolutional recurrent neural network (CRNN), in which convolutional layers isolate local spatial dependencies in the symbolic-state domain, while recurrent LSTM layers capture multi-scale temporal dynamics extending across multiple time horizons. Experimental evaluations are conducted over prediction horizons of 1 day, 10 days, and 100 days, spanning pre-COVID, COVID, and post-COVID market regimes. The results indicate that while longer prediction horizons naturally incur greater forecasting uncertainty due to compounding variability, the integration of symbolic-state preprocessing with deep temporal modeling demonstrates significant robustness in handling non-stationary financial environments. During the stable pre-COVID period, the proposed methodology achieves reductions in mean squared error (MSE) of up to 98% relative to the volatile COVID phase, highlighting its capability to effectively leverage well-defined market patterns in stable economic conditions. Furthermore, the model consistently delivers competitive forecasting performance across all prediction horizons and market regimes. Collectively, these findings emphasize the potential of symbolic-state-based deep learning architectures as a viable pathway to address the complexity and volatility characteristic of modern financial markets. © The Author(s) 2025.Article Citation - WoS: 3Citation - Scopus: 4Gelation of Paam-Pvp Composites: a Fluorescence Study(World Scientific, 2014) Evingür, Gülşen Akin; Kaygusuz, Hakan; Erim, F. Bedia; Pekcan, ÖnderHybrid hydrogels are a new class of composite materials. Polyacrylamide (PAAm) hydrogels are mainly produced by free radical crosslinking copolymerization (FCC) of AAm in the presence of N N'-methylene bis (acrylamide) (BIS) as the crosslinker. Pyranine doped PAAm-poly (N-vinyl pyrrolidone) (PVP) composite were prepared with different amounts of PVP varying in the range between 0.0015 and 0.1 gr. It was observed that pyranine molecules as a fluoroprobe bind to AAm and PVP chains upon the initiation of the polymerization causing the fluorescence spectra of the bonded pyranines shift to the shorter wavelengths. The sol-gel phase transition and its universality were monitored and tested as a function of PVP contents. Observations around the critical point show that the gel fraction exponent beta agreed with the percolation result for below 0.025 gr PVP contents. However classical result was observed above 0.0125 gr PVP content.Article Citation - WoS: 4Citation - Scopus: 3Drying of Polyacrylamide-Multiwalled Carbon Nanotube (mwnt) Composites With Various Mwnts Contents: a Fluorescence Study(Walter De Gruyter Gmbh, 2013) Evingür, Gülşen Akin; Pekcan, ÖnderWe studied the drying of polyacrylamide (PAAm)-multiwalled carbon nanotube (MWNT) composites prepared by free radical crosslinking copolymerization in water with a steady state fluorescence technique. Composite gels were prepared at room temperature with pyranine (Py) doped as a fluorescence probe. Drying experiments were performed in air at various MWNT contents by real time monitoring of the Py fluorescence intensity (I) which increased as the drying proceeded. The Stern-Volmer equation combined with the moving boundary diffusion model was used to explain the behavior of I during drying. It was observed that the desorption coefficient (D) increased as the temperature increased. Drying energies (Delta E) were measured for the drying processes for each MWNT content gel by using fluorescence gravimetrical and volumetric methods. It is understood that Delta E values decrease by increasing MWNT content until 1 wt % MWNT and then increase above the level of this threshold value. The energy of drying is strongly correlated with the MWNT content in the composite. Delta E drops to its lowest value at which conducting cluster starts to appear.Book Part Graphene Oxide-Polyacrylamide Composites: Optical and Mechanical Characterizations(Wiley Blackwell, 2019) Evingür, G.A.; Pekcan, ÖnderGraphene oxide (GO) is a two-dimensional carbon material with similar one-atom thickness, and is a light material having extremely high strength and thermal stability [1]. Thus, GO is an efficient filler for the enhancement of the electrical, mechanical, and thermal properties of composite materials [2]. We focused on GO as a nanofiller in polyacrylamide hydrogels and GO-PAAm composites to investigate the optical and mechanical properties of the composites in this chapter. Gelation, fractal analysis, and optical energy band gap measurements of the composites were performed by UV-Vis and fluorescence spectroscopy techniques. The sol-gel phase transition and its universality were monitored and tested as a function of GO contents. The geometrical distribution of GO during gelation was presented by the fractal analysis. The fractal dimension of the composite gels was estimated based on the power law exponent values using scaling models. UV-Vis spectroscopy was used to investigate the behavior of optical band gap of GO-PAAm composites. On the other hand, mechanical measurements were employed to determine toughness and compressive modulus of the polymer composites before and after swelling. The behavior of compressive modulus was explained by the theory of rubber elasticity. © 2019 John Wiley & Sons, Inc. All rights reserved.Article Citation - WoS: 17Citation - Scopus: 16Cation Effect on Slow Release From Alginate Beads: a Fluorescence Study(Springer/Plenum Publishers, 2014) Kaygusuz, Hakan; Erim, F. Bedia; Pekcan, Önder; Evingür, Gülşen AkinIn this study spherical alginate beads containing pyranine (P-y) as a fluorescence probe were prepared by ionotropic gelation of a sodium alginate solution. The steady state fluorescence technique was used to study pyranine release from the alginate beads crosslinked with calcium barium and aluminum ions respectively. The slow release of P-y was observed with the time drive mode of the spectrophotometer at 512 nm. Fluorescence emission intensity (I-p) from P-y was monitored during the release process and the encapsulation efficiency (EE) of pyranine from the alginate beads was calculated. The Fickian Diffusion model was used to measure the release coefficients D-sl. It was seen that the slow release coefficients of pyranine from the alginate beads crosslinked with Ca2+ Ba2+ and Al3+ ions increased in the following order: D-sl (Al3+)> D-sl (Ca2+)> D-sl (Ba2+). In contrast the initial amount of pyranine and EE into the beads showed the reverse behavior.
