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1

Evaluation of energy efficiency of thermoelectric generator with two-phase thermo-syphon heat pipes and nano-particle fluids

Atalay, Tahsin, Köysal, Yavuz, Özdemir, Ali Ekber, Özbaş, Engin

Journal:

International Journal of Precision Engineering and Manufacturing-Green Technology

Year:

2018

Language:

english

File:

PDF, 4.06 MB

english, 2018

2

Simultaneous determination of refractive index and thickness of multilayer dielectric films by discrete Fourier transform

Oǧuz Köysal, S. Eren San, Serhat Özder

Journal:

Optics Communications

Year:

2004

Language:

english

File:

PDF, 244 KB

english, 2004

3

Molecular reorientation based diffraction in dihydropyridin doped nematic liquid crystal film

S.Eren San, Oğuz Köysal, Mustafa Okutan

Journal:

Dyes and Pigments

Year:

2004

Language:

english

File:

PDF, 194 KB

english, 2004

4

Dielectric spectroscopy analysis of molecular reorientation in dye doped nematic liquid crystals having different preliminary orientation

Mustafa Okutan, S. Eren San, Oğuz Köysal

Journal:

Dyes and Pigments

Year:

2005

Language:

english

File:

PDF, 265 KB

english, 2005

5

Effect of an azo dye (DR1) on the dielectric parameters of a nematic liquid crystal system

S. Özder, M. Okutan, O. Köysal, H. Göktaş, S.E. San

Journal:

Physica B: Condensed Matter

Year:

2007

Language:

english

File:

PDF, 678 KB

english, 2007

6

An experimental and DFT computational study on 4-(3-(1 H -imidazol-1-yl)propyl)-5-methyl-2 H -1,2,4-triazol-3(4 H )-one monohydrate

Tanak, Hasan, Köysal, Yavuz, Ünver, Yasemin, Yavuz, Metin, Işık, Şamil, Sancak, Kemal

Journal:

Molecular Physics

Year:

2010

Language:

english

File:

PDF, 1.17 MB

english, 2010

7

The experimental design of solar heating thermoelectric generator with wind cooling chimney

Özdemir, Ali Ekber, Köysal, Yavuz, Özbaş, Engin, Atalay, Tahsin

Journal:

Energy Conversion and Management

Year:

2015

Language:

english

File:

PDF, 1.74 MB

english, 2015

8

Outdoor performance analysis of different PV panel types

Elibol, Erdem, Özmen, Özge Tüzün, Tutkun, Nedim, Köysal, Oğuz

Journal:

Renewable and Sustainable Energy Reviews

Year:

2017

Language:

english

File:

PDF, 1.81 MB

english, 2017

9

Enhancement of electro-optical and dielectric properties of CdSeS/ZnS semiconductor quantum-dot-doped nematic liquid crystals in the presence of UV-illumination effect

Kocakülah, Gülsüm, Köysal, Oğuz

Journal:

Applied Physics

Year:

2019

Language:

english

File:

PDF, 3.32 MB

english, 2019

10

Crystal structure and computational studies of (E)-1-(benzo[b]thiophen-3-yl)-N-(4-ethoxyphenyl)methanimine

Bülbül, Hakan, Köysal, Yavuz, Doğan, Onur Erman, Dege, Necmi, Ağar, Erbil

Journal:

Crystallography Reports

Year:

2019

Language:

english

File:

PDF, 639 KB

english, 2019

11

Dielectric properties of a side-chain liquid crystalline polymer under laser induced circumstances

S Eren San, Mustafa Okutan, Oǧuz Köysal, Hiroshi Ono, Nobuhiro Kawatsuki

Journal:

Optics Communications

Year:

2004

Language:

english

File:

PDF, 221 KB

english, 2004

12

An experimental optimization study for concentration and laser power effects in the fullerene-C60 and azo dye doped guest–host liquid crystal systems

M. Okutan, O. Köysal, S.E. San, F. Yakuphanoglu

Journal:

Optics Communications

Year:

2009

Language:

english

File:

PDF, 566 KB

english, 2009

13

Investigation of refractive index dispersion and electrical properties in carbon nano-balls’ doped nematic liquid crystals

Mustafa Okutan, S. Eren San, Oğuz Köysal, Fahrettin Yakuphanoglu

Journal:

Physica B: Condensed Matter

Year:

2005

Language:

english

File:

PDF, 362 KB

english, 2005

14

The refractive index dispersion and the optical constants of liquid crystal metal-free and nickel(II) phthalocyanines

F. Yakuphanoglu, M. Durmuş, M. Okutan, O. Köysal, V. Ahsen

Journal:

Physica B: Condensed Matter

Year:

2006

Language:

english

File:

PDF, 197 KB

english, 2006

15

1-Acylthiosemicarbazides, 1,2,4-triazole-5(4H)-thiones, 1,3,4-thiadiazoles and hydrazones containing 5-methyl-2-benzoxazolinones: Synthesis, analgesic-anti-inflammatory and antimicrobial activities

Umut Salgın-Gökşen, Nesrin Gökhan-Kelekçi, Özgür Göktaş, Yavuz Köysal, Ekrem Kılıç, Şamil Işık, Göknur Aktay, Meral Özalp

Journal:

Bioorganic & Medicinal Chemistry

Year:

2007

Language:

english

File:

PDF, 880 KB

english, 2007

16

An outstanding holographic composite employing methyl red and fullerene C60 under the same liquid crystal structure

S.Eren San, Oğuz Köysal

Journal:

Year:

2003

Language:

english

File:

PDF, 170 KB

english, 2003

17

Diffraction efficiency enhancement caused by employing liquid crystal phthalonitrile derivative in nematic liquid crystals

O. Köysal, M. Okutan, S.E. San, M. Durmuş, F.N. Ecevit, V. Ahsen

Journal:

Dyes and Pigments

Year:

2007

Language:

english

File:

PDF, 283 KB

english, 2007

18

Dielectric anisotropy, memory state and diffraction efficiency properties of the spiropyranylazobenzoate AP-SPAB7 doped nematic liquid crystal

Fahrettin Yakuphanoglu, Mustafa Okutan, Oğuz Köysal, Sam-Rok Keum

Journal:

Dyes and Pigments

Year:

2008

Language:

english

File:

PDF, 632 KB

english, 2008

19

Dielectric anisotropy, and diffraction efficiency properties of a doped nematic liquid crystal

F. Yakuphanoglu, M. Okutan, O. Koysal, S.-M. Ahn, S.R. Keum

Journal:

Dyes and Pigments

Year:

2008

Language:

english

File:

PDF, 743 KB

english, 2008

20

Novel phthalocyanines containing substituted salicyclic hydrazone-1,3-thiazole moieties: Microwave-assisted synthesis, spectroscopic characterization, X-ray structure and thermal characterization

İsmail Değirmencioğlu, Esra Atalay, Mustafa Er, Yavuz Köysal, Şamil Işık, Kerim Serbest

Journal:

Dyes and Pigments

Year:

2010

Language:

english

File:

PDF, 550 KB

english, 2010

21

The electrical properties of a fullerene and C.I. Acid Red 2 (methyl red) doped E7 nematic liquid crystal

M. Okutan, S.E. San, O. Köysal, E. Şentürk

Journal:

Dyes and Pigments

Year:

2010

Language:

english

File:

PDF, 537 KB

english, 2010

22

Microwave-assisted and conventional synthesis of new phthalocyanines containing 4-(p-fluorophenyl)-3-methyl-4,5-dihydro-1H-1,2,4-triazol-5-one moieties

Bahittin Kahveci, Musa Özil, Cihan Kantar, Selami Şaşmaz, Şamil Işık, Yavuz Köysal

Journal:

Journal of Organometallic Chemistry

Year:

2007

Language:

english

File:

PDF, 428 KB

english, 2007

23

Electro-optical characteristics of photoinduced isomerization in 2,2′-azobis[5,6-bis(dodecyloxy)quinoxaline]-azo-dye-doped nematic liquid crystals

Oğuz Köysal, Mustafa Okutan, S. Eren San, Fatma Dinçer, Vefa Ahsen, Mahmut Durmuş

Journal:

Journal of Physics and Chemistry of Solids

Year:

2009

Language:

english

File:

PDF, 742 KB

english, 2009

24

Impedance spectroscopy and dielectric anisotropy-type analysis in dye-doped nematic liquid crystals having different preliminary orientations

Mustafa Okutan, Fahrettin Yakuphanoglu, S. Eren San, Oğuz Koysal

Journal:

Physica B: Condensed Matter

Year:

2005

Language:

english

File:

PDF, 776 KB

english, 2005

25

Dielectric spectroscopy analysis in employing liquid crystal phthalonitrile derivative in nematic liquid crystals

M. Okutan, F. Yakuphanoglu, O. Köysal, M. Durmuş, V. Ahsen

Journal:

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Year:

2007

Language:

english

File:

PDF, 535 KB

english, 2007

26

Determination of the refractive index dispersion of thick films by continuous wavelet transform

Serhat Özder, Oğuz Köysal, S. Eren San, F. Necati Ecevit

Journal:

Thin Solid Films

Year:

2004

Language:

english

File:

PDF, 640 KB

english, 2004

27

Thickness measurement of dielectric films by wavelength scanning method

Oğuz Köysal, Duygu Önal, Serhat Özder, F. Necati Ecevit

Journal:

Optics Communications

Year:

2002

Language:

english

File:

PDF, 136 KB

english, 2002

28

Molecular reorientation-based grating diffraction in dye-doped nematic liquid crystals with red pumping source

S.E. San, O. Köysal, F.N. Ecevit

Journal:

Optics Communications

Year:

2002

Language:

english

File:

PDF, 119 KB

english, 2002

29

Effect of laser illumination on the electro optical characters of dye doped nematic liquid crystals

M Okutan, O Köysal, S.E San

Journal:

Year:

2003

Language:

english

File:

PDF, 121 KB

english, 2003

30

Theoretical modeling and experimental studies on N-n-Decyl-2-oxo-5-nitro-1-benzylidene-methylamine

Hasan Tanak, Ferda Erşahin, Yavuz Köysal, Erbil Ağar, Şamil Işık, Metin Yavuz

Journal:

Journal of Molecular Modeling

Year:

2009

Language:

english

File:

PDF, 360 KB

english, 2009

31

Experimental and DFT computational studies on 5-benzyl-4-(3,4-dimethoxyphenethyl)-2H-1,2,4-triazol-3(4H)-one

Hasan Tanak, Yavuz Köysal, Metin Yavuz, Orhan Büyükgüngör, Kemal Sancak

Journal:

Journal of Molecular Modeling

Year:

2010

Language:

english

File:

PDF, 612 KB

english, 2010

32

Experimental and DFT studies of ethyl N′-3-(1H-imidazol-1-yl) propylcarbamoyl benzohydrazonate monohydrate

Hasan Tanak, Yavuz Köysal, Yasemin Ünver, Metin Yavuz, Şamil Işık, Kemal Sancak

Journal:

Structural Chemistry

Year:

2009

Language:

english

File:

PDF, 430 KB

english, 2009

33

Molecular reorientation based diffraction in a hybrid liquid crystal system applicable for two different laser sources simultaneously

Oğuz Köysal, S. Eren San, Mustafa Okutan, Serhat Özder

Journal:

Dyes and Pigments

Year:

2007

Language:

english

File:

PDF, 165 KB

english, 2007

34

Diffraction efficiency and conductivity enhancement of nematic liquid crystals by doping star-like fullerenes

S. Eren San, Oğuz Köysal, Mustafa Okutan, F. Necati Ecevit

Journal:

Dyes and Pigments

Year:

2008

Language:

english

File:

PDF, 296 KB

english, 2008

35

Nonlinear experimental dye-doped nematic liquid crystal optical transmission spectra estimated by neural network empirical physical formulas

Nihat Yildiz, Sait Eren San, Oğuz Köysal

Journal:

Optics Communications

Year:

2010

Language:

english

File:

PDF, 931 KB

english, 2010

36

The effect of side-chain liquid crystalline concentration in liquid crystal on dielectric properties

M. Gökçen, O. Köysal, M. Yıldırım, Ş. Altındal

Journal:

Journal of Physics and Chemistry of Solids

Year:

2012

Language:

english

File:

PDF, 337 KB

english, 2012

37

Molecular orientation and photorefractive effects in single-wall carbon nanotubes doped nitrile–ester mixture liquid crystals

Oğuz Köysal, Mustafa Okutan, S. Eren San, Roman Dabrowski, F. Necati Ecevit

Journal:

Materials Chemistry and Physics

Year:

2008

Language:

english

File:

PDF, 559 KB

english, 2008

38

Diffraction efficiency and I–V characteristics of metal-free phthalocyanine doped nematic liquid crystals

Oğuz Köysal, Mustafa Okutan, S.Eren San, Tebello Nyokong, Mahmut Durmuş

Journal:

Materials Chemistry and Physics

Year:

2009

Language:

english

File:

PDF, 1.03 MB

english, 2009

39

Effect of frequency on dielectric properties of liquid crystal doped with side-chain liquid crystalline polymer

M. Gökçen, O. Köysal

Journal:

Materials Chemistry and Physics

Year:

2011

Language:

english

File:

PDF, 295 KB

english, 2011

40

Investigation of dielectric properties and diffraction efficiency enhancements caused by photothermal effect in DR9 dye-doped nematic liquid crystal

Oğuz Köysal, Mustafa Okutan, Muharrem Gökçen

Journal:

Optics Communications

Year:

2011

Language:

english

File:

PDF, 879 KB

english, 2011

41

Crystal structure, spectroscopic investigations and density functional studies of 4-(4-methoxyphenethyl)-5-benzyl-2H-1,2,4-triazol-3(4H)-one monohydrate

Yavuz Köysal, Hasan Tanak

Journal:

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Year:

2012

Language:

english

File:

PDF, 976 KB

english, 2012

42

Determination of birefringence dispersion in nematic liquid crystals by using an S-transform

Özder, Serhat, Coskun, Emre, Köysal, Oguz, Kocahan, Özlem

Journal:

Year:

2007

Language:

english

File:

PDF, 224 KB

english, 2007

43

Dielectric properties of laser-induced conditions in a hybrid composite made by doping a side-chain liquid crystalline polymer

S.E. San, M. Okutan, O. Köysal, H. Ono

Journal:

Journal of Non-Crystalline Solids

Year:

2005

Language:

english

File:

PDF, 156 KB

english, 2005

44

Laser-induced dielectric anisotropy of a hybrid liquid crystal composite made up of methyl red and fullerene C60

S.E. San, O. Köysal, M. Okutan

Journal:

Journal of Non-Crystalline Solids

Year:

2005

Language:

english

File:

PDF, 227 KB

english, 2005

45

Molecular orientation and dielectric anisotropy properties of 4-cyano-4′-n-heptylbiphenyl–TiO2 liquid crystal composite

M. Okutan, F. Yakuphanoglu, O. Köysal, S.E. San, G.A. Oweimreen

Journal:

Journal of Non-Crystalline Solids

Year:

2008

Language:

english

File:

PDF, 883 KB

english, 2008

46

Debye type dielectric relaxation in carbon nano-balls’ and 4-DMAABCA acid doped E7 coded nematic liquid crystal

E. Şentürk, M. Okutan, S.E. San, O. Köysal

Journal:

Journal of Non-Crystalline Solids

Year:

2008

Language:

english

File:

PDF, 496 KB

english, 2008

47

Temperature dependency of impedance spectroscopy behaviors in side-chain liquid crystalline polymer

M. Okutan, O. Köysal, S.E. San, E. Şentürk

Journal:

Journal of Non-Crystalline Solids

Year:

2009

Language:

english

File:

PDF, 328 KB

english, 2009

48

Holographic recording study of a hybrid liquid crystal system doped with dye and fullerene

S. Eren San, Oğuz Köysal, F. Necati Ecevit, Serhat Özder, Dmitri Dvornikov

Journal:

Synthetic Metals

Year:

2004

Language:

english

File:

PDF, 129 KB

english, 2004

49

Diffraction efficiency and dielectric relaxation properties of nickel phthalocyanine doped nematic liquid crystal

O. Köysal, M. Okutan, M. Durmuş, F. Yakuphanoglu, S.E. San, V. Ahsen

Journal:

Synthetic Metals

Year:

2006

Language:

english

File:

PDF, 432 KB

english, 2006

50

Effect on response time and diffraction efficiency of co-usage azo dye and carbon nanoparticle in nematic liquid crystal

Oğuz Köysal, S. Eren San

Journal:

Synthetic Metals

Year:

2008

Language:

english

File:

PDF, 536 KB

english, 2008