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pro vyhledávání: '"K. Ogrodnik"'
Akademický článek
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Autor:
Paweł Perkowski, M. Żurowska, Zbigniew Raszewski, K. Ogrodnik, Wiktor Piecek, Leszek R. Jaroszewicz, Roman Dąbrowski
Publikováno v:
Phase Transitions. 86:138-146
Antiferroelectric Sm phase can be created at cooling from Iso, SmA* and SmC* phases. When antiferroelectric phase appears from the ferroelectric one, the magnitude of Goldstone mode detected in SmC* is much higher than the amplitude of low frequency
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8a3f33a6c7dc71330ec6aba0326171b
https://doi.org/10.1080/01411594.2012.715304
https://doi.org/10.1080/01411594.2012.715304
Publikováno v:
Phase Transitions. 84:1098-1107
Liquid crystal possessing two biphenyl moieties in the molecular core and lateral chlorine substitution far from the chiral chain has been studied by dielectric spectroscopy. On cooling from the isotropic phase, the material possesses the frustrated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a06560c88dd36fad320e4182db2d489
https://doi.org/10.1080/01411594.2011.580432
https://doi.org/10.1080/01411594.2011.580432
Autor:
Leszek R. Jaroszewicz, Wiktor Piecek, K. Ogrodnik, M. Żurowska, Paweł Perkowski, Zbigniew Raszewski, Roman Dąbrowski
Publikováno v:
Liquid Crystals. 38:1159-1167
In a large class of smectic mixtures prepared at our University, the phase transition between chiral ferroelectric smectic C (SmC*) and chiral antiferroelectric smectic C (SmCA*) phases can be observed on cooling. Under bias field the temperature of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9412ac97fbac06c77f469f4dd511331d
https://doi.org/10.1080/02678292.2011.600836
https://doi.org/10.1080/02678292.2011.600836
Autor:
Roman Dąbrowski, Przemysław Morawiak, Paweł Perkowski, K. Ogrodnik, Wiktor Piecek, Zbigniew Raszewski, E. Kruszelnicki-Nowinowski, Jerzy Kedzierski
Publikováno v:
Molecular Crystals and Liquid Crystals. 525:112-127
This paper presents tunable liquid crystal filter consists of three interference filters (LC – cells) with different cell thicknesses. These filters use nematic liquid crystal (with high birefringence). Such design allows to select precisely (using
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0df2cb3e6bb3278bf336bcd2477e89d9
https://doi.org/10.1080/15421401003796132
https://doi.org/10.1080/15421401003796132
Autor:
M. Żurowska, Wiktor Piecek, K. Ogrodnik, Zbigniew Raszewski, Roman Dąbrowski, Paweł Perkowski
Publikováno v:
Molecular Crystals and Liquid Crystals. 525:50-56
New antiferroelectric fluorinated mixture W-1000 was made. Typical two dielectric modes with frequencies around 1–10 kHz and 100 kHz–1 MHz were detected in . Additionally high frequency mode was observed with relaxation frequency higher than 1 MH
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6fcf7fd10a2c49b2f72f753dd15b577d
https://doi.org/10.1080/15421401003795969
https://doi.org/10.1080/15421401003795969
Autor:
Jolanta Rutkowska, Wiktor Piecek, Magdalena Zurowska, Xiao Wei Sun, K. Ogrodnik, Roman Dabrowski, Jerzy Kedzierski, Paweł Perkowski, Zbigniew Raszewski
Publikováno v:
Ferroelectrics. 365:88-94
The promising materials for applications are Antiferroelectric Liquid Crystals. Two dielectric modes were detected in AFLCs, as far [1, 2]. Low frequency mode called P L with the relaxation frequency around 100 Hz as well as high frequency mode calle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bdd30bd575d16a7d0c416beb983fede1
https://doi.org/10.1080/00150190802063666
https://doi.org/10.1080/00150190802063666
Autor:
Paweł Perkowski, K. Ogrodnik, Wiktor Piecek, Emilia Miszczyk, Marek Olifierczuk, Leszek R. Jaroszewicz, Jerzy Kedzierski, Przemysław Morawiak, Zbigniew Raszewski, Edward Nowinowski-Kruszelnicki, Marek Andrzej Kojdecki
Publikováno v:
Opto-Electronics Review. 20
A new method for quick and pretty accurate measurements of splay, twist and bend elastic constants of nematic liquid crystals is experimentally verified. The main concept relies on exploiting only the electric field and determining magnitudes of nema
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9818c6e4e6ed69d1ea877273f4d6a9b1
https://doi.org/10.2478/s11772-012-0027-9
https://doi.org/10.2478/s11772-012-0027-9
Autor:
Marek Andrzej Kojdecki, Emilia Miszczyk, Jerzy Kedzierski, Przemysław Morawiak, Wiktor Piecek, Jerzy Zielinski, Zbigniew Raszewski, E. Kruszelnicki-Nowinowski, K. Ogrodnik, Paweł Perkowski
Publikováno v:
Opto-Electronics Review. 18
A new accurate and fast interference method for determining ordinary and extraordinary refractive indices of nematic liquid crystals is presented and discussed. The method relies on microscopic measurements of distances between interference fringes a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23defb0033e4926e8d8f80edd7dc1904
https://doi.org/10.2478/s11772-010-0009-8
https://doi.org/10.2478/s11772-010-0009-8
Autor:
Roman Dąbrowski, D. Łada, Xiao Wei Sun, Jolanta Rutkowska, M. Żurowska, Paweł Perkowski, Wiktor Piecek, K. Ogrodnik, Zbigniew Raszewski
Publikováno v:
Opto-Electronics Review. 16
Three new pure antiferroelectric materials, synthesized at the Military University of Technology (MUT), were investigated by dielectric means. Clear relaxation modes were detected, i.e., Soft, Goldstone, low frequency in-phase (PL) as well high frequ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71287fa99017edb1a45711e2cbb85a92
https://doi.org/10.2478/s11772-008-0013-4
https://doi.org/10.2478/s11772-008-0013-4