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1
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Investigations of α + β → β Phase Transformation in Monotonically Heated Ti6Al7Nb Alloy / Badania Przemiany Fazowej α + β → β W Stopie Ti6Al7Nb Przy Nagrzewaniu Ciągłym

100%
Dąbrowski R.
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issue 4
2
Publication available in full text mode
Content available

The Kinetics of Phase Transformations During Continuous Cooling of the Ti6Al4V Alloy from the Single-Phase β Range

100%
Dąbrowski R.
Archives of Metallurgy and Materials
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2011
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issue 3
3
Publication available in full text mode
Content available

The Kinetics of Phase Transformations During Continuous Cooling of Ti6Al4V Alloy from the Diphase α + β Range

100%
Dąbrowski R.
Archives of Metallurgy and Materials
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2011
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issue 2
4
Publication available in full text mode
Content available

Effect of Heat Treatment on the Mechanical Properties of Two-Phase Titanium Alloy Ti6al7nb/ Wpływ Obróbki Cieplnej Na Własności Mechaniczne Dwufazowego Stopu Tytanu Ti6al7nb

100%
Dąbrowski R.
Archives of Metallurgy and Materials
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2014
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issue 4
5
Publication available in full text mode
Content available

Tempering Temperature Effects on Hardness and Impact Toughness of 56NiCrMo7 Steel Wpływ Temperatury Odpuszczania Na Twardość i Udarność Stali 56NiCrMo7

64%
Dąbrowski R., Dziurka R.
Archives of Metallurgy and Materials
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2011
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issue 1
6
Content available remote

Prenematic Self-Assembling of Mesogenic Molecules in Isotropic Liquid and Orientational Order in Nematic Phase

51%
Wolarz E., Bauman D., Jadżyn J., Dąbrowski R.
Acta Physica Polonica A
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2011
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vol. 120
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issue 3
447-454
EN
Dielectric relaxation study of nematogenic 4-n-alkyl-4'-cyanobiphenyls (nCB, n = 5, 6), 4-(trans-4'-n-alkylcyclohexyl)isothiocyanatobenzenes (nCHBT, n = 6, 8), 4-cyanophenyl-4'-n-alkylbenzoates (nCPB, n = 6, 8), 4-cyano-3-fluorophenyl-4'-n-octyloxybenzoate (8OCFPB), and 4-cyanophenyl-4'-n-octyloxy-3'-fluorobenzoate (8OCPFB) was performed in the frequency range from 50 kHz to 100 MHz in the nematic and isotropic phases. The static permittivity and the relaxation process related to the rotation of molecules around their short axis was analyzed. For some of these liquid crystals anomalous temperature dependence of static permittivity in the pretransitional region of the isotropic phase was observed. Based on the Meier-Saupe-Martin model of molecular diffusion in nematics, the orientational order parameter 〈P_2〉 was determined from dielectric relaxation times and retardation factor. The values of 〈P_2〉 calculated from the dielectric relaxation data were compared with the results obtained from measurements of polarized electronic absorption. Correlations between the magnitude of the dielectric pretransitional effect and the orientational order in the nematic phase were discussed.
7
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Dielectric Properties of Liquid Crystalline Isothiocyanato-tolane Derivatives with Fluorine Atom at Various Lateral Positions

51%
Czub J., Urban S., Dąbrowski R., Gestblom B.
Acta Physica Polonica A
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2005
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vol. 107
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issue 6
947-958
EN
Dielectric studies were performed for several isothiocyanato-tolane compounds having the F atom attached to the benzene rings at different lateral positions and the alkoxy or alkyl chain at the p-position. They form the nematic phase in broad temperature intervals. The static as well as dynamic properties of the compounds in the nematic and isotropic phases were studied. Tensor permittivity components: ε_ǁ, ε_⊥, Δε, as functions of temperature were measured. The complex dielectric permittivity, ε^*(f)=ε'(f)-iε''(f), was measured in the frequency range of 1 kHz - 3 GHz from which the relaxation times τ_ǁ and τ_⊥ were calculated. The order parameter S(T) was determined from the dielectric data. It was found that the close vicinity of the F atom and the alkoxy group results in blocking of the internal rotation of the wing around the O-phenyl bond.
8
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Uterine non-enzymatic antioxidant defence mechanisms (glutathione, vitamin C, copper and zinc) in diagnosis of canine pyometra

46%
Szczubiał M., Dąbrowski R., Bochniarz M., Brodzki P., Szczubiał M., Dąbrowski R., Bochniarz M., Brodzki P.
Polish Journal of Veterinary Sciences
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2019
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issue 3
9
Content available remote

Dielectric Properties of Compounds Creating Dual-Frequency Nematic Liquid Crystals

45%
Mrukiewicz M., Perkowski P., Garbat K., Dąbrowski R., Parka J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
940-945
EN
In this paper we report how dielectric spectroscopy can help in creating of dual-frequency nematic liquid crystals. Dual-frequency nematic liquid crystals is new class of liquid crystal materials. Such mixture is usually formed by a combination of many components (even more than 10), which can be split into two groups: molecules having large transverse dipole moment and molecules with a large longitudinal dipole moment. The behavior of a base (parent) mixture, functional admixtures and final dual-frequency nematic liquid crystals mixture is investigated by dielectric spectroscopy in wide frequency (100 Hz-10 MHz) and temperature ranges. This allows us to find out why the dual-frequency liquid crystal has an important feature: positive and negative dielectric anisotropy at different frequencies. We present parameters of molecular motions around short (S-mode) and long (L-mode) molecular axes observed in investigated materials and discuss how the creation of final dual-frequency nematic liquid crystals mixture can modify molecular relaxations.
10
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Spectral Tuning of the Long-Period Fiber Gratings by Using Low Birefringence Liquid Crystals

45%
Czapla A., Bock W., Woliński T., Dąbrowski R., Nowinowski-Kruszelnicki E.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
589-592
EN
The work presented in this paper is focused on investigation of the spectral properties of the long-period fiber gratings combined with the liquid crystals, named liquid crystal long-period fiber gratings. The experiments carried out showed that the proposed designs of the liquid crystal long-period fiber gratings can offer very interesting spectral properties and can introduce a new level of sensitivity. In particular, a high-efficiency thermal tuning of the long-period fiber gratings coated with low-birefringence liquid crystal layers could be achieved and gave rise to a fast and wide switching ability of the attenuation bands within their transmission spectrum.
11
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Ferroelectric Liquid Crystal for Use in a New Generation of LCDs

45%
Fitas J., Marzec M., Tykarska M., Wróbel S., Dąbrowski R.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
954-958
EN
The key to improvements in liquid crystalline displays lies in the continuous synthesis and studies of new kinds of liquid crystalline substances. Among them, ferroelectric compounds are the subject of much attention, due to the potential progresses in switching time, colour depth, and other qualities of liquid crystal displays. In this paper we describe the research of the physical properties of 4-(2-methylbutoxy)phenyl 4-(octyloxy)-benzoate for purposes of its potential application in liquid crystal displays.
12
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Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure - ERRATUM

45%
Czerwiec J., Dąbrowski R., Żurowska M., Ziobro D., Wróbel S.
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issue 6
978
13
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Comparison of Different Liquid Crystal Materials under Planar and Homeotropic Boundary Conditions in Capillaries

45%
Chychłowski M., Ertman S., Nowinowski-Kruszelnicki E., Dąbrowski R., Woliński T.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
582-584
EN
We present a thermally-induced liquid crystal orientation method by applying an extra orienting layer onto an inner capillary surface that can induce either planar or homeotropic liquid crystal boundary conditions. Experimental evidence of boundary-induced orientation in two types of liquid crystal (nematic, chiral nematic) in a capillary are shown.
14
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Assessment of lipid and protein peroxidation markers in non-pregnant and pregnant female dogs

45%
Szczubiał M., Kankofer M., Dąbrowski R., Bochniarz M., Urban-Chmiel R.
Polish Journal of Veterinary Sciences
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2015
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issue 1
15
Publication available in full text mode
Content available

Concentration of serum amyloid A and ceruloplasmin activity in milk from cows with subclinical mastitis caused by different pathogens

45%
Szczubiał M., Dąbrowski R., Kankofer M., Bochniarz M., Komar M.
Polish Journal of Veterinary Sciences
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2012
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issue 2
16
Content available remote

Dielectric Properties of Ferroelectric Liquid Crystals with Diversified Molecular Structure

45%
Czerwiec J., Dąbrowski R., Żurowska M., Ziobro D., Wróbel S.
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issue 4
553-556
EN
Mesomorphic, thermodynamic, electro-optic and dielectric properties of three homologues of fluorosubstituted esters are described. Full chemical names of these compounds are as follows: (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-penta-fluoro-propano-ynloxyhex-1-oxy)-biphenyl-4-yl (in short 2F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-nona-fluoro-pentano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 4F6BBiOC8), (S)-(+)-4-(1-metyl-hepty-loksy)benzoate-(6-trideca-fluoro-heptano-yloxyhex-1-oxy)-biphenyl-4-yl (in short 6F6BBiOC8). The compounds exhibit ferroelectric smectic C* phase between crystalline and isotropic phase. Only one compound (6F6BBiOC8) shows antiferroelectric phase (SmC*_{A}) observed by dielectric spectroscopy, but the range of this phase is narrow of about 2°. All three compounds exhibit in the SmC* phase Goldstone mode and Maxwell-Wagner relaxation hidden in the conductivity contribution at low frequencies, whereas in the SmC* _{A} phase two anti-ferroelectric modes (AFM1) and (AFM2) contribute to the dielectric spectrum. The compounds were studied using differential scanning calorimetric, frequency domain dielectric spectroscopy, and reversal currents method to determine spontaneous polarization.
17
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Studies of New Antiferroelectric Liquid Crystal Based on Quantum-Chemical Model

39%
Tomczyk W., Marzec M., Juszyńska E., Dąbrowski R., Ziobro D., Wróbel S., Massalska-Arodź M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
949-953
EN
Physical properties of new thermotropic antiferroelectric liquid crystal have been studied. Experiments were done by use of complementary methods such as differential scanning calorimetry, polarizing optical microscopy and X-ray powder diffractometry. Acquired data from X-ray powder diffractometry was examined under application of quantum chemical approach. It has been found that compound studied exhibits stable enantiotropic antiferroelectric SmC_{A}* phase in the wide temperature range while ferroelectric phase SmC* is very narrow.
18
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Anomalous Dielectric Spectra of Ferro- and Ferrielectric Liquid Crystalline Phase in MHPNBC

39%
Dubois F., Douali R., Wawrzyniak A., Legrand C., Ropa P., Wróbel S., Dąbrowski R.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
937-939
EN
MHPOBC analogue with long achiral alkyl chain has been investigated by dielectric spectroscopy studies in the wide temperature range. Low frequency dielectric spectroscopy revealed the existence of normal ferroelectric phase (in a narrow gap), two ferri- and three antiferroelectric phases in addition to paraelectric phase and alpha sub-phase. The compound studied shows exceptionally strong dependence of the dielectric permittivities on measuring electric field in the temperature range of ferro- and ferrielectric phases.
19
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Propagation Effects in Photonic Liquid Crystal Fibers with a Complex Structure

39%
Tefelska M., Chychłowski M., Woliński T., Dąbrowski R., Rejmer W., Wójcik J.
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issue 6
1259-1261
EN
Chiral nematic liquid crystals are very interesting materials to infiltrate photonic crystal fibers since they are characterized by unique optical properties such as selective Bragg reflection, circular dichroism, and optical activity. In this paper the latest experimental results of the photonic crystal fibers filled with new chiral nematic liquid crystals are presented. Spectral properties of the light propagating in the photonic liquid crystal fibers have been measured and analyzed.
20
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Photonic Liquid Crystal Fibers with Polymers

27%
Woliński T., Tefelska M., Mileńko K., Siarkowska A., Budaszewski D., Domański A., Ertman S., Orzechowski K., Rutkowska K., Sierakowski M., Nowinowski-Kruszelnicki E., Dąbrowski R., Mergo P.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
613-616
EN
Photonic liquid crystal fibers with polymers constitute a new solution based on liquid crystals and microstructured polymer optical fibers opening up new areas in innovative sensing and photonic devices applications. Compared with their silica-based microstructured fibers, it is easier to fabricate exotic microstructured polymer optical fibers by extrusion or drilling at low temperature; their nonlinearity is potentially stronger, the range of available polymers that may be drawn is more diverse and the biocompatibility of polymers is often better. Liquid crystals due to their attractive properties i.e., the high birefringence, high electro-optic and thermo-optic effects are a very good candidate for microstructured polymer optical fiber infiltration to obtain tunable all-in-fiber innovative photonic devices. The paper will discuss basic properties and possible applications of the polymer photonic liquid crystal fibers that will arise from their high optical tunability with external and internal factors. Current research effort is directed towards two main solutions: photonic crystal fibers and microstructured polymer optical fiber-based structures, both infiltrated with liquid crystals of tailored optical properties.
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