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    Wyświetlanie 1-8 z 8
    Tytuł:
    Tabu Search Against Permutation Based Stream Ciphers
    Autorzy:
    Polak, I.
    Boryczka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227111.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tabu search
    TS
    cryptanalysis
    RC4
    VMPC
    stream cipher
    state recovery attack
    Opis:
    Encryption is one of the most effective methods of securing data confidentiality, whether stored on hard drives or transferred (e.g. by e-mail or phone call). In this paper a new state recovery attack with tabu search is introduced. Based on research and theoretical approximation it is shown that the internal state can be recovered after checking 2⁵² internal states for RC4 and 2¹⁸⁰ for VMPC.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 2; 137-145
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In vitro effect of antiparasitic drugs on the expression of the genes code receptors: AchR and GABA in Anisakis simplex L3 larvae
    Autorzy:
    Lopienska-Biernat, E.
    Polak, I.
    Stryiński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/6514.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    in vitro effect
    antiparasitic drug
    gene expression
    receptor
    AchR zob.acetylcholine receptor
    acetylcholine receptor
    gamma-aminobutyric acid
    Anisakis simplex
    larva
    Źródło:
    Annals of Parasitology; 2016, 62, Suppl.
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Disrupted iron metabolism in peritoneal fluid may induce oxidative stress in the peritoneal cavity of women with endometriosis
    Autorzy:
    Polak, G.
    Barczyński, B.
    Wertel, I.
    Kwaśniewski, W.
    Bednarek, W.
    Derewianka-Polak, M.
    Fraszczak, K.
    Olajossy, M.
    Kotarski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081934.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Endometriosis
    peritoneal fluid
    oxidative stress
    haemaglobin
    iron
    total oxidative status
    total antioxidant status
    Opis:
    Introduction and objective. Data on the possible role of peritoneal fluid free radical-mediated oxidative damage in the pathogenesis of endometriosis still remains inconsistent. The aim of the study was to determine iron metabolism markers and their influence on oxidative stress parameters in the peritoneal fluid of women with endometriosis. Materials and method. 110 women with endometriosis and 119 patients with benign ovarian cysts were included in the study. All visible peritoneal fluid was aspirated during laparoscopy from the anterior and posterior cul-de-sacs. under direct vision to avoid blood contamination. Haemoglobin, iron, total oxidative status, and total antioxidant status were measured using standard colourimetric kits. Results. Haemoglobin, iron levels, as well as total oxidative status values were significantly higher, whereas total antioxidant status values were significantly lower in the peritoneal fluid of patients with endometriosis, in comparison to the reference groups. No differences were observed in peritoneal fluid concentrations of all parameters measured in relation to the phase of the menstrual cycle. Conclusions. Peritoneal fluid of women with endometriosis is characterized by disrupted iron metabolism. This is most likely related to an increased number of erythrocytes in the peritoneal cavity of endometriotic women, which leads to a higher concentration of haemoglobin in this environment. Impaired iron homeostasis may have a significant influence on the pathophysiology of peritoneal endometriosis by the direct impact of haemoglobin derivatives and/or formation of the pro-inflammatory and pro-oxidative environment. Peritoneal cavity oxidative stress occurs predominantly in women in advanced stages of the disease.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 4; 587-592
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on changing patterns of reproductive behaviours due to maternal features and place of residence in Poland during 1995–2014
    Autorzy:
    Genowska, A.
    Szafraniec, K.
    Polak, M.
    Szpak, A.
    Walecka, I.
    Owoc, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081598.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    fertility
    inequality in procreation
    maternal age
    socio-economic status
    marital status
    rural-urban
    Polska
    Opis:
    Introduction. The sharp decline in the total fertility rate in Poland coincided with broader socio-economic changes, which resulted in its reduction to the lowest level observed among the countries of Central and Eastern Europe. Objective. The aim of the study was to investigate and evaluate the changing patterns of reproductive behaviour in rural and urban areas, depending on the demographic and socio-economic features in Poland. Materials and method. Information about live births in Poland in the years 1995–2014 were obtained from the Central Statistical Office. Registered cases of live births in rural and urban areas were analyzed considering the maternal features (age, marital status, main source of income). To evaluate the changes in fertility and comparisons between rural and urban areas, Joinpoint Regresssion was used. Results. In 1995–2014, a shift in the age of highest fertility from 20–24 years to 25–29 years was observed. This occurred at the same time as a reduction in the fertility rate per 1,000 women aged 15–29 years, more pronounced in rural areas (95.8 to 60.0) than in urban areas (63.4 to 51.5), while in women aged 30–49 years, a faster increase in fertility was observed in urban areas (16.4 to 32.0) than in rural areas (27.5–29.2). Fertility trends between rural and urban areas differed significantly. A significant increase in live births for employed mothers was shown mainly in 2005–2009; later, the growth rate in rural areas was slower and in urban areas the growth trend stopped. Conclusion. The postponement of births and reduction of fertility in women aged 15–29 requires active measures aimed at creating favourable conditions for achieving economic independence for the younger generation, as well as combining work with raising children, especially in rural areas.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 1; 137-144
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fruiting bodies of Hericium erinaceus (Bull.) Pers. - a new source of water-insoluble (1→3)-alfa-d-glucan
    Autorzy:
    Wiater, A.
    Choma, A.
    Komaniecka, I.
    Pleszczynska, M.
    Siwulski, M.
    Polak, p.
    Janusz, G.
    Szczodrak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/56606.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    A water-insoluble polysaccharide (WIP) was isolated from the fruiting bodies of Hericium erinaceus HE01 by an alkaline solution with the yield of 5%. Structural and compositional analyses by total acid hydrolysis, methylation analysis, FT-IR, FT-Raman, and ¹H NMR spectroscopy as well as other instrumental techniques showed predominantly glucose linked by α-glycosidic bonds and small amounts of mannose, xylose, rhamnose, galactose, and ribose. The methylation analysis showed that (1→3)-linked Glcp is the major constituent (70.8%) of the polymer, while the 3,4 substituted d-Glcp represents the main branching residue of the glucan. The presence of (1→3)-α-d-glucan in the hyphae of H. erinaceus was additionally confirmed by the use of specific fluorophore-labeled antibodies.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Structural Study of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting
    Autorzy:
    Hawelek, L.
    Wlodarczyk, P.
    Zackiewicz, P.
    Polak, M.
    Kaminska, M.
    Puźniak, R.
    Radelytskyi, I.
    Kolano-Burian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402326.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    75.30.Kz
    61.05.C-
    61.66.Fn
    Opis:
    Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 76-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Textile Multilayered Systems with Magnetorheological Fluids for Potential Application in Multi-Threat Protections. Preliminary Stab - Resistance Studies
    Materiały kompozytowe z cieczami magnetoreologicznymi do potencjalnego zastosowania w ochronie przed zróżnicowanymi zagrożeniami – wstępne badania odporności na przekłucie
    Autorzy:
    Olszewska, K.
    Polak, J.
    Zielińska, D.
    Struszczyk, M. H.
    Kucińska, I.
    Wierzbicki, Ł.
    Kozłowska, J.
    Leonowicz, M.
    Wiśniewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/233188.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    ballistic insert
    magnetorheological fluid (MRF)
    MRF/fabric composite
    impact test
    stab resistance
    wkładka balistyczna
    elastyczne pancerze
    ciecz magnetoreologiczna (MRF)
    MRF / tkanina kompozytowa
    test na uderzenia
    odporność na przekłucie
    Opis:
    The article presents the results of preliminary work carried out for flexible body armour systems designs which contained three types of magnetorheological fluid (MRFs). The stab resistance of the multilayered material systems with magnetorheological fluids were investigated. Tests were carried out on a newly built rig at the Faculty of Materials Science and Engineering, Warsaw University of Technology. Three different configurations of flexible body armour were made. It was found that samples of the multilayered material system containing MRF had lower depth of deformation by about 30% than the reference samples. The combination of MRFs with para-aramid woven fabrics in several usable forms and/or sheets of ultra-high molecular weight polyethylene fibres gives possibilities for obtaining new types of multi-layered systems protecting effectively against various kind of threats.
    W niniejszym artykule zaprezentowano wyniki wstępnych prac przeprowadzonych dla elastycznych pancerzy, zawierających 3 typy cieczy magnetoreologicznej. Zbadano odporności na przekłucie układów materiałowych z cieczami MR. Testy przeprowadzono na nowo powstałym stanowisku na Wydziale Inżynierii Materiałowej, Politechniki Warszawskiej. Wykonano konstrukcje elastycznych pancerzy o trzech różnych konstrukcjach. Na podstawie wstępnych wyników stwierdzono, iż próbki zawierające ciecz magnetoreologiczną miały mniejszą głębokość deformacji o ok. 30 % niż odpowiadające im wzorce. Połączenie cieczy MR z tkaninami z włókien para-aramidowych i/lub z nietkanymi wyrobami z włókien polietylenowych stwarza możliwość uzyskania nowego typu kompozytów skutecznie chroniących przed różnego rodzaju zagrożeniami.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2013, 5 (101); 112-116
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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