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Wyświetlanie 1-15 z 15
Tytuł:
Equimolecular Mixture of Calamitic and Bent-Core Thiobenzoates
Autorzy:
Chruściel, J.
Wantusiak, B.
Ossowska-Chruściel, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419573.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
64.70.M-
78.15.+e
Opis:
This article reports on the new results on phase transitions, mesomorphic and electro-optical properties of new equimolecular mixture of calamitic and bent-core thiobenzoates. Two following liquid crystals were the components of the binary mixture: (S)-(+)-4-(1-methylheptyloxy)biphenyl 4'-octylthiobenzoate (MHOBS8) having rode-like, calamitic-chiral molecules possessing among others ferroelectric smectic C (SmC*) and bis [4-(4'-octylphenylthiocarbonyl)phenyl] isophtalates from a homologous series of banana-shaped thioesters, referred to as IFOS8, where n = 8 denoted the number of carbon atoms in terminal alkyl chains in both mesogens, synthesized by us. The IFOS8 compound has two enantiotropic phases: B2 with antiferroelectric order and B6. The mesomorphic properties were investigated by means of three complementary methods: differential scanning calorimetry, polarized light optical microscopy, and transmitted light intensity. Electro-optical measurements were also carried out.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 375-377
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of neonatal or adult heat acclimation on plasma fT3 level, testicular thyroid receptors expression in male rats and testicular steroidogenesis in vitro in response to triiodothyronine treatment
Autorzy:
Kurowicka, B.
Chrusciel, M.
Zmijewska, A.
Kotwica, G.
Powiązania:
https://bibliotekanauki.pl/articles/31539.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
This study aimed to evaluate the effect of heat acclimation of neonatal and adult rats on their testes response to in vitro treatment with triiodothyronine (T3). Four groups of rats were housed from birth as: 1) control (CR) at 20°C for 90 days, 2) neonatal heat-acclimated (NHA) at 34°C for 90 days, 3) adult heat-acclimated (AHA) at 20°C for 45 days followed by 45 days at 34°C and 4) de-acclimated (DA) at 34°C for 45 days followed by 45 days at 20°C. Blood plasma and both testes were harvested from 90-day old rats. Testicular slices were then submitted to in vitro treatment with T3 (100 ng/ml) for 8 h. Plasma fT3 level was lower in AHA, NHA and DA groups than in CR group. Basal thyroid hormone receptor α1 (Thra1) expression was higher in testes of NHA and DA and β1 receptor (Thrb1) in DA rats vs. other groups. In the in vitro experiment, T3: 1) decreased Thra1 expression in all groups and Thrb1 in DA group, 2) increased Star expression in CR, NHA and DA groups, and Hsd17b3 expression in NHA group, 3) decreased the expression of Cyp11a1 in NHA and DA groups, and Cyp19a1 in all the groups, 4) did not affect the activity of steroidogenic enzymes and steroid secretion (A4, T, E2) in all the groups. These results indicate, that heat acclimation of rats, depending on their age, mainly affects the testicular expression of steroidogenic enzymes in response to short-lasting treatment with T3.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphism and Initial Structure Modelling of a New Mesogen 9OSBch
Autorzy:
Kosyl, M.
Zając, W.
Ossowska-Chruściel, M.
Chruściel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1399021.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.Eb
64.70.M-
Opis:
We report the properties of a novel mesogen with high temperature cholesteric mesophase, which belongs to an unexplored as yet series of cholesteric esters. This compound is cholesteryl 4-(4-nonyloxybenzoylthio) benzoate ($C_9H_{19}OC_6H_4COSC_6H_4COOch$, where ch = cholesteryl), hereafter named 9OSBch. The chemical structure and purity of 9OSBch was established by $ \text{}^1 H$ NMR, $\text{}^{13} C$ NMR and FT-IR spectroscopy, and its mesomorphism was characterised by differential scanning calorimetry, polarizing optical microscopy, and transmitted light intensity. Differential scanning calorimetry measurements showed that substance is stable up to 270C and partially decomposes above this temperature. Observation under polarizing optical microscope revealed oily streak texture of cholesteric phase (Ch). The chemical structure of an isolated molecule was optimized by the density functional theory method. Energetically most favourable configuration is that of hockey stick geometry. At the same time this is the conformation best suited for the formation of highly ordered condensed phases.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 959-963
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Room Temperature Ferroelectric Mixture of Chiral and Achiral Thioesters
Autorzy:
Czerwiec, J.
Ossowska-Chruściel, M.
Chruściel, J.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/1538218.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Nh
78.15.+e
64.70.M-
Opis:
Dielectric properties of the mixture of two thioester compounds: 4-8-alkoxy-benzoate-thio-carboxyl S-4-pentyl-phenyl (8OS5), (s)-4-(1-methyl-heptyloxy)biphenyl-4-thio-carboksyl 4-9-alkil-phenyl (MHOBS9) are presented. The chiral compound exhibits nematic (N*) and ferroelectric smectic C* phase (SmC*). The achiral compound shows N, SmA and monotropic SmC and SmB phases. the mixture of both compounds of 0.5 molar fraction shows SmC* in the wider temperature range than pure MHOBS9. The mixture was studied using frequency domain dielectric spectroscopy. Dielectric measurements for the SmC* phase of the mixture revealed Goldstone mode at higher frequencies and Maxwell-Wagner relaxation at low frequencies.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 549-552
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric and Conductivity Anisotropy in Liquid Crystalline Phases of Strongly Polar Thioesters
Autorzy:
Mikułko, A.
Fraś, M.
Marzec, M.
Wróbel, S.
Ossowska-Chruściel, M.
Chruściel, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813171.pdf
Data publikacji:
2008-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
61.30.Eb
77.22.-d
66.10.Ed
Opis:
The main objective of this paper is to study dielectric properties of two compounds of acronyms 5OSCl and 6OSCl having strongly polar bond (C-Cl) at para position. Dielectric measurements were done in the frequency range from 40 Hz to 15 MHz. The dielectric spectra were measured for two principal alignments. For homeotropic alignment, the reorientation of molecule around the short molecular axis was observed. Both substances studied exhibit large positive dielectric anisotropy and the anisotropy of conductivity was obtained in smectic A as well as nematic phase.
Źródło:
Acta Physica Polonica A; 2008, 113, 4; 1155-1160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of different breeding units and breeding systems on reproductive results of cockatiels (Nymphicus hollandicus)
Wpływ pomieszczeń hodowlanych i systemu hodowli na efekty reprodukcyjne nimf (Nymphicus hollandicus)
Autorzy:
Banaszewska, D.
Ostrowski, D.
Biesiada-Drzazga, B.
Andraszek, K.
Gorski, K.
Flis-Chrusciel, M.
Powiązania:
https://bibliotekanauki.pl/articles/45146.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2015, 14, 1
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
XRD phase investigations of steam oxidized Fe and Ni rich Cr alloys
Autorzy:
Dudziak, T.
Witkowska, M.
Ratuszek, W.
Chruściel, K.
Powiązania:
https://bibliotekanauki.pl/articles/391538.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
austenitic steel
Ni based alloys
high temperature
steam
XRD
Opis:
The aim of this work was to summarise XRD investigations performed after the tests carried out in steam oxidation conditions in the temperature range 700‒800°C for 3000 hours. In this work, two solid-solution strengthened alloys; Haynes® 230®, 617 alloy and two (γ’) gamma-prime strengthened alloys; 263 and Haynes® 282® and high alloyed steels rich in Cr: 309S, 310S and HR3C were exposed. The phase analyses were carried out using two techniques; Bragg-Brentano (BB) geometry and geometry of constant angle called grazing incidence α = 1° and α = 3°.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 265-276
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Highly Automated Agile Testing Process: An Industrial Case Study
Autorzy:
Berłowski, J.
Chruściel, P.
Kasprzyk, M.
Konaniec, I.
Jureczko, M.
Powiązania:
https://bibliotekanauki.pl/articles/384067.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
software engineering
testing process
agile software development
case study
Opis:
This paper presents a description of an agile testing process in a medium size software project that is developed using Scrum. The research methods used is the case study were as follows: surveys, quantifiable project data sources and qualitative project members opinions were used for data collection. Challenges related to the testing process regarding a complex project environment and unscheduled releases were identified. Based on the obtained results, we concluded that the described approach addresses well the aforementioned issues. Therefore, recommendations were made with regard to the employed principles of agility, specifically: continuous integration, responding to change, test automation and test driven development. Furthermore, an efficient testing environment that combines a number of test frameworks (e.g. JUnit, Selenium, Jersey Test) with custom-developed simulators is presented.
Źródło:
e-Informatica Software Engineering Journal; 2016, 10, 1; 69-87
1897-7979
Pojawia się w:
e-Informatica Software Engineering Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric and Electrooptic Investigations of B Phases οf Banana-Shaped Thioesters
Autorzy:
Wierzejska-Adamowicz, M.
Ossowska-Chruściel, D.
Chruściel, J.
Douali, R.
Legrand, Ch.
Marzec, M.
Mikułko, A.
Sikorska, A.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/1538244.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Nh
77.84.-s
78.20.Jq
Opis:
Electrooptic and dielectric measurements were done for B phases of two banana-shaped homologues 1,3-phenylene bis{4-[(4-nonylo-xy-benzoyl)sulfanyl]benzoate (9OSOR) and 1,3-phenylene bis{4-[(4-dodecylo-xy-benzoyl)sulfanyl]benzoate (12OSOR). Polarizing microscopy allowed to identify $B_{1}$ phase for 9OSOR and $B_{2}$ phase for 12OSOR on the basis of texture observation. Spontaneous polarization measurements were performed using reversal current method. The current response to applied triangular voltage shows that $B_{1}$ phase is a ferroelectric and $B_{2}$ phase - antiferroelectric one for which two well separated peaks were observed. Polarization for phase $B_{1}$ of 9OSOR is rather small and its temperature dependence is unusual for ferroelectric liquid crystals - it increases with temperature. Spontaneous polarization for $B_{2}$ phase of 12OSOR compound is of about 600 nC/$cm^{2}$. Dielectric spectra measured with bias field for $B_{2}$ phase of 12OSOR show two well separated relaxation processes. In the low frequency range the relaxation process is connected with fluctuations of ferroelectric domains. The relaxation process in the high frequency range appearing also without bias field is connected with molecular reorientation. The dielectric spectra measured for $B_{1}$ phase of 9OSOR with and without bias voltage showed only one dielectric relaxation process connected with molecular reorientation around the short axis.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 557-561
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimicrobial Functionalization of Textile Materials with Copper Silicate
Biofunkcjonalizacja materiałów włókienniczych
Autorzy:
Sójka-Ledakowicz, J.
Chruściel, J. J.
Kudzin, M. H.
Łatwińska, M.
Kiwała, M.
Powiązania:
https://bibliotekanauki.pl/articles/232464.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
biofunctionalization
textile materials
nonwovens
antimicrobial properties
biofunkcjonalizacja
tkaniny
włókniny
właściwości przeciwbakteryjne
Opis:
A biofunctionalization of nonwoven fabrics was carried out with 0.1 - 4 wt.% of copper silicate. Polypropylene (PP), polyethylene (PE) and biodegradable polymers [poly(lactic acid) (PLA), polyhydroxyalkanoates (PHA)] or their mixtures were used as polymer components. Mostly liquid oligomers of ethylene glycol (PEG) or copolymers of ethylene oxide and propylene oxide (2.5 - 5 wt.%) were applied as plasticizers. New composite nonwovens containing CuSiO3 were prepared by the melt-blown technique [1]. They showed very good antibacterial and antifungal properties against colonies of gram-negative bacteria (Escherichia coli), gram-positive bacteria (Staphylococcus aureus) and a yeast fungus (Candida albicans). Nonwovens containing ≥ 0.5 wt.% of CuSiO3 can be used, e.g. as hygienic and bioactive filter materials in air-conditioning systems. The application of PLA and PHA affects the ability of these hybrid nonwovens to biologically decompose. DSC analysis indicated that the incorporation of additives in PLA and PP nonwovens significantly affected their melting and crystallization processes.
Badano proces biofunkcjonalizacji włóknin za pomocą 0,1 - 4 % wag. krzemianu miedzi. Jako komponenty polimerowe zastosowano polipropylen (PP), polietylen (PE) i polimery biodegradowalne [polilaktyd (PLA) i polihydroksyalkaniany (PHA)] lub ich mieszaniny. Jako ciekłe plastyfikatory stosowano głównie oligomery tlenku etylenu (PEG) lub jego kopolimery z tlenkiem propylenu (2,5-5 % wag.). Nowe kompozytowe włókniny zawierające CuSiO3 otrzymywano metodą melt-blown – przez wytłaczanie i rozdmuchiwanie stopionych kompozycji polimerowych [1]. Wykazywały one bardzo dobre właściwości antybakteryjne (wobec szczepów bakterii gram-ujemnych Escherichia coli i gram-dodatnich Staphylococcus aureus) oraz antygrzybiczne (wobec grzyba Candida albicans). Włókniny zawierające ≥0.5% wag. CuSiO3 mogą być stosowane np. jako bioaktywne materiały higieniczne i filtracyjne w układach klimatyzacji. Zastosowanie PLA i PHA zwiększa podatność tych hybrydowych włóknin na rozkład biologiczny. Analiza termiczna metodą DSC wykazała, że dodatek CuSiO3 i plastyfikatorów do włóknin PLA i PP znacznie wpływa na przebieg ich procesów topnienia i krystalizacji.
Źródło:
Fibres & Textiles in Eastern Europe; 2016, 5 (119); 151-156
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical bioimpedance in patients after ischemic stroke, a civilization disease
Autorzy:
Nalepa, D.
Czrkowska, M.
Załuska, W.
Jakubowska, K.
Chruściel, P.
Powiązania:
https://bibliotekanauki.pl/articles/2082979.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
cerebral stroke
electrical bioimpedance
hydration
Opis:
Introduction. Ischemic stroke is caused by artery blockage, resulting in damage to brain tissue. A significant factor in the further treatment of a patient is not only the time to reach a specialist centre, but also the state of hydration of the organism. Clinical situations involving the excess or deficiency of water can have extremely serious consequences for the functioning of the body and subsequent stroke-related disorders. One of the increasingly common methods of evaluating the composition of the human body is by electrical bioimpedance. Objective. The aim of the study was to assess the state of human body hydration measured by bioimpedance in patients with an early stage of ischemic stroke. Methods and materials. The examination involved 81 patients with ischemic stroke in the Neurology Department, Subdivision of Stroke Treatment at the Province Specialist Hospital in Lublin, Poland, in 2015. Measurement of the composition and outer and intracellular space of the human body by the Whole Body Bioimpedance (WBIA) method was performed using the Body Composition Monitor (BCM) (Fresenius Medical Care GmbH, Bad Homburg, Germany). Results. A group of patients were been examined with the use of the BIA apparatus three times: on the first, seventh, and tenth day of hospital stay, to determine the level of body hydration. Comparative analysis of data showed that on the first day of hospitalization all the measurements of electrical bioimpedance parameters in the patients were significantly different from those of the control group. In the case of TBW, ECW, ICW, the patients’ scores were significantly higher than those of the control group. Only with respect to the over-hydration index, the patients achieved a significantly lower score than the control group. Conclusions. Assessment of hydration status in patients with a diagnosed stroke indicates a slight dehydration in relation to the control group, but falling within the scope of normovolaemia, according to bioimpedance measurement standards.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 46-50
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Female sexuality at reproductive age as an indicator of satisfaction with life - descriptive cross-sectional survey
Autorzy:
Bień, A.
Rzońca, E.
Chruściel, P.
Łuka, M.
Iwanowicz-Palus, G.J.
Powiązania:
https://bibliotekanauki.pl/articles/28762962.pdf
Data publikacji:
2020
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2020, 27, 4; 599-604
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy
Autorzy:
Wawrzyniak, A.
Chruściel, J.
Douali, R.
Dubois, F.
Leblond, J.
Legrand, Ch.
Ossowska-Chruściel, D.
Marzec, M.
Ropa, P.
Czerwiec, J.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399012.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Nh
64.70.M-
77.22.Gm
77.22.Ej
Opis:
(S)-(+)-4'-[(4-(1-methylheptyloxycarbonylphenyl) thiocarbonylphenyl]-decyloxybenzoate (in short 10.OPOSMH) was studied by complementary methods. The substance shows rich polymorphism. In addition to ferroelectric and antiferroelectric smectic C* phases it possesses three ferrielectric sub-phases. Phase transitions between the phases were revealed by differential scanning calorimetry and static dielectric permittivity measurements. The aim of this paper was to study phase transitions and differences in dielectric spectra shown by different phases. Collective and molecular dynamics of all phases shown by 10.OPOSMH will be discussed in terms of theoretical models. Dielectric spectra of antiferroelectric phase show two characteristic dielectric relaxation modes: one connected with the molecular process (reorientation around the short axis) and the other originating from fluctuations of antiferroelectric order parameters.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 933-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in the quality of life dependent on family status of the elderly living in rural areas - a cross-sectional survey
Autorzy:
Chruściel, P.
Szczekala, K.M.
Derewiecki, T.
jakubowska, K.
Nalepa, D.
Czekirda, M.E.
Mianowska, V.
Czerkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2081863.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
quality of life
family
elderly
loneliness
Opis:
Introduction. A factor that conditions the perception of the quality of life (QoL) is having a social network and relationships within it. The quality of life of seniors is assumed to be at a higher level if they are surrounded by those close to them in comparison to those living alone. The aim of the study was to assess differences in the quality of life of elderly rural residents depending on their family status. Materials and method. Due to the random and mixed selection of respondents, the study comprised a group of 588 representatives living in rural areas of Eastern Poland. The differentiated criterion of the groups of senior respondents was their family situation: living with a family or living alone. Assessment of the quality of life was conducted by means of the WHOQoL-bref questionnaire. The Mann-Whitney tests and Kruskal-Wallis tests were used to carry out statistical analysis of the data. Results. The respondents who lived with their families differed statistically to a significant extent (p<0.005) from those who lived alone. The former gave a better assessment of the majority of the QoL domains: physical, psychological and social. Obtaining higher mean values for the environmental domain among the respondents living alone (M=14.31) seemed to be an atypical and interesting phenomenon because seniors living with their relatives usually assessed that dimension better than those living alone. Conclusions. The family situation of seniors affected the level of quality of life. Living with their relatives may be expected to be favourable for seniors because it translates into better performance in physical, psychological and social domains. Loneliness, which frequently accompanies old age, leads to the deterioration of the quality of life.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 3; 532-538
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Psychosocial aspect of quality of life of Polish women with breast cancer
Autorzy:
Pacian, A.
Kulik, T.B.
Pacian, J.
Chrusciel, P.
Zolnierczuk-Kieliszek, D.
Jarosz, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/49711.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 3
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-15 z 15

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