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Wyświetlanie 1-10 z 19
Tytuł:
Tabu Search Against Permutation Based Stream Ciphers
Autorzy:
Polak, I.
Boryczka, M.
Tematy:
tabu search
TS
cryptanalysis
RC4
VMPC
stream cipher
state recovery attack
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/227111.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polimorfizm izoenzymowy i zmienność genetyczna wybranych populacji cząstkowych świerka rasy istebniańskiej
Isozyme polymorphism and genetic variation of selected partial populations of Istebna spruce [Picea abies [L.] Karst]
Autorzy:
Polak-Berecka, M.
Perchlicka, I.
Tematy:
zmiennosc genetyczna
polimorfizm
izoenzymy
ekotypy
Picea abies
lesnictwo
swierk istebnianski
swierk pospolity
drzewa lesne
genetic diversity
isozyme polymorphism
picea abies
poland
Pokaż więcej
Wydawca:
Polskie Towarzystwo Leśne
Powiązania:
https://bibliotekanauki.pl/articles/1017254.pdf  Link otwiera się w nowym oknie
Opis:
The genetic structure of Norway spruce [Picea abies (L.) Karst] of the Istebna race was studied in two populations from the Carpathian seed stands in the Malinka and Czarne Forestries. The recent provenance test results have shown a high quality of both populations. The results were compared with the genetic variation parameters calculated for the selected seed stand from the Bukowiec Forestry (compartment 149h), whose genetic structure in the progeny test for this species is considered a national standard. Five enzyme systems were analysed. The results show that the mean number of alleles per locus and the heterozygosity observed in the analysed populations are greater than those reported in the literature for other natural Norway spruce populations from the Carpathians. The heterozygosity level of the studied seed stands was higher than of the selective population of the Istebna spruce plus trees and the level of genetic diversity was similar to that of the Bukowiec seed stands. Thus, it can be concluded that the analysed seed stands from Czarne and Malinka, compartment 91h can be used as a supplementary seed base. However, at the individual partial population level, the Bukowiec spruce population, compartment 149h is considered to be of the highest value.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody identyfikacji modelu układu oddechowego w czasie przerwania przepływu powietrza
Methods of identification of a model for the respiratory system during airflow interruption
Autorzy:
Jabłoński, I.
Polak, A.
Mroczka, J.
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:
https://bibliotekanauki.pl/articles/153394.pdf  Link otwiera się w nowym oknie
Opis:
W pracy przedstawiono technikę przerywania przepływu wykorzystywaną w pomiarach oporu dróg oddechowych oraz podstawowe problemy z nią związane. Wykorzystując zmodyfikowany model zastępczy układu oddechowego zaproponowany przez Duboisa i in. [4], przeprowadzono analizę własności identyfikacji jego parametrow w dziedzinie czasu i częstotliwości. Opisane prace stanowia kontynuację badań poświęconych ocenie metrologicznej techniki przerywania przepływu.
The interrupter technique for measurement of respiratoty system resistance has been presented and its main problems concerned. The analysis of identification properties for parameters of a modified electrical analogue for the respiratory system proposed by Dubois et al. [4] has been performed, both in the time and frequency domain. This work is a continuation of the investigation focused on metrological evaluation of the interrupter technique.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza kannabinoli i opiatów za pomocą TLC
Determination of opiates and cannabinols by TLC
Autorzy:
Błądek, J.
Polak, P.
Jarzyna, E.
Jakubowska, I.
Tematy:
kannabinole
opiaty
chromatografia cienkowarstwowa
skrining labolatoryjny
cannabinols
opiates
thin layer chromatography
laboratory screening
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Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:
https://bibliotekanauki.pl/articles/209636.pdf  Link otwiera się w nowym oknie
Opis:
Przedstawiono wyniki badań nad zastosowaniem instrumentalnej chromatografii cienkowarstwowej do analizy opiatów i kannabinoli. Sprecyzowano zasady rozdziału składników zawartych w ekstraktach konopi i preparatach opiatów oraz zasady identyfikacji i oznaczeń zawartych w nich substancji psychotropowych. Oszacowano oznaczalność graniczną i błędy metody. Zaproponowane rozwiązania analityczne zweryfikowano podczas analizy handlowych próbek opiatów oraz pomiarów poziomu ∆⁹-tetrahydrokannabinolu w suszu konopi. The paper contains the results of investigation on application of thin layer chromatography (TLC) for-determined
The paper contains the results of investigation on application of thin layer chromatography (TLC) for determination of opiates and cannabinols. The rules of separation of components contained in extracts of Cannabis and the preparations of opiates were specified. The rules of identification and marks of contains in them psychotropic substances were also specified. Detection limit and errors of the method were estimated. Propose analytical solutions were verified during an analysis of commercial samples of opiates and measurements of contents ∆⁹-THC in Cannabis.
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.
Tematy:
Endometriosis
peritoneal fluid
oxidative stress
haemaglobin
iron
total oxidative status
total antioxidant status
Pokaż więcej
Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/2081934.pdf  Link otwiera się w nowym oknie
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.
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.
Tematy:
fertility
inequality in procreation
maternal age
socio-economic status
marital status
rural-urban
Polska
Pokaż więcej
Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/2081598.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bullet - proof vests with the ballistic inserts based on the fibrous composites
Autorzy:
Polak, J.
Kucinska, I.
Grabowska, G.
Błaszczyk, J.
Ledwon, E.
Romek, R.
Struszczyk, M.H.
Tematy:
kompozyty włókniste
kamizelka kuloodporna
fibrous composites
bullet-proof vest
Pokaż więcej
Wydawca:
Instytut Technologii Bezpieczeństwa Moratex
Powiązania:
https://bibliotekanauki.pl/articles/238088.pdf  Link otwiera się w nowym oknie
Opis:
Several design solutions of bullet-proof vests featuring improved ballistic resistance within area of hard inserts based on fibrous composites, recently developed by the "MORATEX" Institute were presented. They are mainly dedicated for the officers of services subordinated to the Ministry of Interior and Administration. They consider latest world-wide trends of developing, regarding started works within the development PO IG (Innovative Economy National Cohesion Strategy) project No.01.03.01-10-005/08 "Modern ballistic body armours and covers for transportation means as well as for buildings made on a basis of textile composites". The composite insert for the vests and some vest designs are one of product groups being developed within the project. Their modern designs were presented and discussed, along with the results of metrological tests of physical and mechanical parameters of materials as well as the ballistic tests results. The initial presumptions for developing Polish inserts based on the fibrous composites were stated.
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.
Wydawca:
Polskie Towarzystwo Botaniczne
Powiązania:
https://bibliotekanauki.pl/articles/56606.pdf  Link otwiera się w nowym oknie
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.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 19

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