Autor: Denis, D. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Observation Procedures Characterizing Occupational Physical Activities: Critical Review
Autorzy:: Denis, D.
Lortie, M.
Rossignol, M.
Powiązania:: https://bibliotekanauki.pl/articles/89974.pdf
Data publikacji:: 2000
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: physical work
observation procedures
reliability
validity
observer training
obserwacja
praca fizyczna
warunki pracy
Opis:: The first objective of this paper is to compare the observation procedures proposed to characterize physical work. The second objective is to examine the following 3 methodological issues: reliability, observer training, and internal validity. Seventy-two papers were reviewed, 38 of which proposed a new or modified observation grid. The observation variables identified were broken down into 7 categories as follows: posture, exertion, load handled, work environment, use of feet, use of hands, and activities or tasks performed. The review revealed the variability of existing procedures. The examination of methodological issues showed that observation data can be reliable and can present an adequate internal validity. However, little information about the conditions necessary to achieve good reliability was available.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2000, 6, 4; 463-491
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Wpływ zawartości Sn na odporność korozyjną stopów żelaza
Effect of Sn content on corrosion resistance of iron
Autorzy:: Jagielska-Wiaderek, K.
Bala, H.
Denis-Brewczyńska, D.
Powiązania:: https://bibliotekanauki.pl/articles/391373.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:: cyna
odlewnicze stopy Fe-Sn
szybkość korozji
korozja atmosferyczna
tin
Fe-Sn casting alloys
corrosion rate
atmospheric corrosion
Opis:: W pracy scharakteryzowano odporność na korozję kwasową sześciu stopów żelaza zawierających dodatki od 0,007 do 1,03% wag. cyny. Stopy te uzyskano przez przetapianie w piecu Tammana czystego żelaza (99,98% Fe) z dodatkami spektralnie czystej cyny. Otrzymane wytopy poddano badaniom odporności na korozję kwasową, wykonując przyśpieszony test na korozję atmosferyczną, badania elektrochemiczne oraz pomiary szybkości korozji (określane z analizy roztworów korozyjnych na zawartość Fe²⁺). Wykonane pomiary elektrochemiczne pokazują, że zarówno w środowisku kwasu siarkowego, jak i zakwaszonego siarczanu sodu obecność 0,007−1,03% Sn w żelazie nie wykazuje istotnego wpływu na szybkość korozji badanych stopów. Uzyskane wartości i_kor (wyznaczone na drodze ekstrapolacji do E_kor, jak i na podstawie R_p), w granicach ich błędu pomiarowego, można uznać za niezależne od zawartości cyny w stopie. Obserwuje się jednak wpływ obecności cyny na przebieg korozji atmosferycznej w kwaśnej mgle solnej – szybkość ta ulega zmniejszeniu w miarę wzrostu zawartości Sn w analizowanych próbkach.
The study characterizes the acid corrosion resistance of six iron alloys containing additions from 0.007 to 1.03 wt. % of tin. The alloys were obtained by way of remelting in a Tamman furnace made of pure iron (99.98% Fe) with additions of spectrally pure tin. The obtained melts underwent studies of acid corrosion resistance by means of an atmospheric corrosion test, electrochemical tests and corrosion rate measurements (determination from the analysis of the corrosion solutions in respect of the Fe²⁺ content). The performed electrochemical measurements show that both in the environment of sulfuric acid and acidified sodium sulfate, the presence of 0.007−1.03% Sn in the iron does not exhibit a significant effect on the corrosion rate of the examined alloys. The obtained values of i_cor (determined by way of extrapolation to E_cor and based on R_p), within their measurement error, can be treated as independent of the tin content in the alloy. However, one can observe the effect of the presence of tin on the course of atmospheric corrosion in the acid salt spray – this rate is reduced with an increase of the Sn content in the analyzed samples.
Źródło:: Prace Instytutu Odlewnictwa; 2017, 57, 1; 3-10
1899-2439
Pojawia się w:: Prace Instytutu Odlewnictwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Investigations of polycaprolactone/gelatin blends in terms of their miscibility
Autorzy:: Kolbuk, D.
Sajkiewicz, P.
Denis, P.
Choinska, E.
Powiązania:: https://bibliotekanauki.pl/articles/200281.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: blends
compatibility
miscibility
polycaprolactone
gelatin
Opis:: Synthetic and natural polymers blends represent a new brand of materials with application in wound healing, scaffolds or drug delivery systems. Polycaprolactone/gelatin (PCL/Gt) blends were analyzed in terms of their miscibility. The PCL structure was investigated as a function of Gt content. Changes in the PCL spherulitic structure with Gt content were investigated by a polarizing-interference microscope. The analysis of the glass transition temperature (Tg) of both components as a function of PCL/Gt ratio by differential scanning calorimetry indicates that the system of polycaprolactone/gelatin belongs to a type of s.c. compatible system, being intermediate between miscible and immiscible systems. There is possibility of very limited miscibility of both components. Supplementary wide angle X-ray scattering results are presented.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 629-632
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Identifiability and estimation of pharmacokinetic parameters for the ligands of the macrophage mannose receptor
Autorzy:: Verdiere, N.
Denis-Vidual, L
Joly-Blanchard, G.
Domurado, D.
Powiązania:: https://bibliotekanauki.pl/articles/908453.pdf
Data publikacji:: 2005
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: układ nieliniowy
identyfikowalność
estymacja parametrów
zastosowania biologiczne
nonlinear systems
identifiability
parameter estimation
biological applications
Opis:: The aim of this paper is numerical estimation of pharmacokinetic parameters of the ligands of the macrophage mannose receptor, without knowing a priori the values of these parameters. However, it first requires a model identifiability analysis, which is done by applying an algorithm implemented in a symbolic computation language. It is shown that this step can lead to a direct numerical estimation algorithm. In this way, a first estimate is computed from noisy simulated observations without a priori parameter values. Then the resulting parameter estimate is improved by using the classical least-squares method.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2005, 15, 4; 517-526
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: PDGF-BB homodimer serum level – a good indicator of the severity of alcoholic liver cirrhosis
Autorzy:: Kurys-Denis, E.
Prystupa, A.
Luchowska-Kocot, D.
Krupski, W.
Bis-Wencel, H.
Panasiuk, L.
Powiązania:: https://bibliotekanauki.pl/articles/2085441.pdf
Data publikacji:: 2020
Wydawca:: Instytut Medycyny Wsi
Tematy:: alcohol
liver cirrhosis
Child-Pugh score
platelet derived growth factor AA
platelet growth factor AB
platelet derived
growth factor BB
Opis:: Introduction. Liver cirrhosis is a chronic disease in which progressive fibrosis is noted. This process leads to changed architectonics of the liver parenchyma and the appearance of regenerative nodules, all of which are caused by pathological activation of the hepatic stellate cells. This process is enhanced on a molecular level by many cytokines, with platelet-derived growth factors (PDGFs) playing the key role. Objective. The aim of the study was to assess serum concentrations of PDGFs active biodymers (PDGF-AA, PDGF-BB and PDGF-AB) in patients with alcoholic liver cirrhosis, and to correlate them with the stage of disease. Materials and method. 64 patients with alcoholic cirrhosis and a control group of 16 healthy individuals were analysed. Liver cirrhosis was determined based on clinical image, history of the patients’ alcohol consumption, laboratory findings and abdominal ultrasonography. The serum PDGF-AA, PDGF-BB and PDGF-AB concentrations were determined using ELISA kits. Results. Serum concentration of PDGF-AA and PDGF-BB homodimers increases in patients with alcoholic liver cirrhosis (p=0.034 and p<0.0001, respectively), unlike the serum concentration of PDGF-AB heterodimer (p>0.05). When the stage of the disease increases, the concentrations of PDGF-AA and PGFD-BB in blood also oncrease. Furthermore, the serum level of both PDGF-AA and PDGF-BB correlates significantly with the severity of alcoholic liver cirrhosis (measured by Pugh-Child’s scale), the correlation being stronger in the case of PDGF-BB levels than PDGF-AA (R=0.28; p=0.027 and R=0.26; p=0.038, respectively). Conclusions. The plasma levels of PDGF-AA and -BB may be indicators of alcohol-induced liver fibrosis process, and might be considered as future possible treatment targets, with PDGF-BB levels being an even better indicator than PDGF-AA levels.
Źródło:: Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 80-85
1232-1966
Pojawia się w:: Annals of Agricultural and Environmental Medicine
Dostawca treści:: Biblioteka Nauki