Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Nowak, J.Z." wg kryterium: Autor


Wyświetlanie 1-9 z 9
Tytuł:
Laser-Assisted Thermomechanical Bending of Tube Profiles
Autorzy:
Widłaszewski, J.
Nowak, M.
Nowak, Z.
Kurp, P.
Powiązania:
https://bibliotekanauki.pl/articles/355622.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser forming
laser-assisted bending
numerical modelling
Opis:
The subject of the work is the analysis of thermomechanical bending process of a thin-walled tube made of X5CrNi18-10 stainless steel. The deformation is produced at elevated temperature generated with a laser beam in a specially designed experimental setup. The tube bending process consists of local heating of the tube by a moving laser beam and simultaneous kinematic enforcement of deformation with an actuator and a rotating bending arm. During experimental investigations, the resultant force of the actuator and temperature at the laser spot are recorded. In addition to experimental tests, the bending process of the tube was modelled using the finite element method in the ABAQUS program. For this purpose, the tube deformation process was divided into two sequentially coupled numerical simulations. The first one was the heat transfer analysis for a laser beam moving longitudinally over the tube surface. The second simulation described the process of mechanical bending with the time-varying temperature field obtained in the first simulation. The force and temperature recorded during experiments were used to verify the proposed numerical model. The final stress state and the deformation of the tube after the bending process were analyzed using the numerical solution. The results indicate that the proposed bending method can be successfully used in forming of the thin-walled profiles, in particular, when large bending angles and a small spring-back effect are of interest.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 421-430
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling and preliminary validation of drag-based vertical axis wind turbine
Autorzy:
Krysiński, T.
Buliński, Z.
Nowak, A. J.
Powiązania:
https://bibliotekanauki.pl/articles/240209.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical modeling
numerical axis wind turbine
computational fluid dynamics (CFD)
modelowanie numeryczne
turbina wiatrowa
komputerowa mechanika płynów
Opis:
The main purpose of this article is to verify and validate the mathematical description of the airflow around a wind turbine with vertical axis of rotation, which could be considered as representative for this type of devices. Mathematical modeling of the airflow around wind turbines in particular those with the vertical axis is a problematic matter due to the complex nature of this highly swirled flow. Moreover, it is turbulent flow accompanied by a rotation of the rotor and the dynamic boundary layer separation. In such conditions, the key aspects of the mathematical model are accurate turbulence description, definition of circular motion as well as accompanying effects like centrifugal force or the Coriolis force and parameters of spatial and temporal discretization. The paper presents the impact of the different simulation parameters on the obtained results of the wind turbine simulation. Analysed models have been validated against experimental data published in the literature.
Źródło:
Archives of Thermodynamics; 2015, 36, 1; 19-38
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immunohistochemical detection of Lawsonia intracellularis in tissue section from pigs
Autorzy:
Szczotka, A.
Stadejek, T.
Zmudzki, J.
Nowak, A.
Osinski, Z.
Pejsak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/31904.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of the present study was to develop an immunohistochemical method (IHC) for detection of Lawsonia intracellularis (L. intracellularis) in formalin-fixed, paraffin embedded sections of intestines from pigs and to implement this method in differential diagnosis of swine diseases with diarrhea in postweaning pigs. The study was conducted on 165 sections of intestines (ileum, caecum and colon) collected from 76 pigs, representing 42 Polish pig farms. The animals included in the analysis suffered from diarrhea, with bloody or grey to brown feces, and were suspected of porcine proliferative enteropathy (PPE). Sections of intestines were analyzed for the presence of L. intracellularis by polymerase chain reaction (PCR) and IHC. Among 165 intestinal samples from pigs with diarrhea, L. intracellularis DNA was detected by PCR in 33 (20.0%) samples. In this group, 30 samples (18.2% of all the samples tested) were also found positive in IHC, while only 3 (1.8%) were IHC-negative. One hundred thirty-two (80.0%) samples were negative in both tests. The PCR- and IHC-positive samples originated from 11 pigs, 4- to 20-week old, from 8 farms. L. intracellularis antigen was visualized by IHC mostly in intestinal crypts and/or in mononuclear cells of the lamina propria). The positive signal in epithelial cells was observed close to the luminal borders, creating typical specifically stained rims around the crypt lumina.ą The results of the present study further confirm the usefulness of IHC in the detection of L. intracellularis antigen in the intestinal tissues.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of a Neogene basalt intrusion on the optical properties and internal structure of the dispersed organic matter in Carboniferous strata (SW-part USCB)
Autorzy:
Adamczyk, Z.
Kokowska-Pawłowska, M.
Komorek, J.
Klupa, A.
Lewandowska, M.
Nowak, J.
Powiązania:
https://bibliotekanauki.pl/articles/139126.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optical properties
natural coke
neogenic intrusion
carbonisation
właściwości optyczne
koks naturalny
intruzja neogeniczna
karbonizacja
Opis:
The S-7 borehole log from the Sumina area (USCB Poland) revealed the presence of three basaltic veins originating from a basalt dyke. Coal interlayers in the rocks surrounding the basaltic veins have been coked to form natural coke. Photometric measurements revealed that the optical properties of the studied natural coke samples are characteristic of semi-graphite (Rmax > 9%). The natural coke matrix of all of the analyzed samples has a biaxial negative optical character. Vitrinite in the examined natural coke samples is characterized by a lower optical anisotropy than that of the natural matrix and it has a biaxial positive optical character. Vitrinite in almost all samples taken at locations more distant from the intrusion has a biaxial positive optical character. A reversal of the changes of the true maximum vitrinite reflectance and bireflectance with changing distance from the second basaltic vein has been observed. The temperature regime that acted upon the dispersed organic matter located in the immediate vicinity of the intrusion, estimated on the basis of the selected experimental data, is suggested to be higher than 750°C.
Źródło:
Acta Geologica Polonica; 2018, 68, 2; 249-262
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antimicrobial susceptibility of Brachyspira hyodysenteriae isolated from 21 Polish farms
Autorzy:
Zmudzki, J.
Szczotka, A.
Nowak, A.
Strzelecka, H.
Grzesiak, A.
Pejsak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/32546.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Swine dysentery (SD) is a common disease among pigs worldwide, which contributes to major production losses. Antimicrobial susceptibility testing of B. hyodysenteriae, the etiological agent of SD, is mainly performed by the agar dilution method. This method has certain limitations due to difficulties in interpretation of results. The aim of this study was the analysis of antimicrobial susceptibility of Brachyspira hyodysenteriae (B. hyodysenteriae) Polish field isolates by broth microdilution procedure. The study was performed on 21 isolates of B. hyodysenteriae, collected between January 2006 to December 2010 from cases of swine dysentery. VetMIC™ Brachyspira panels with antimicrobial agents (tiamulin, valnemulin, doxycycline, lincomycin, tylosin and ampicillin) were used for susceptibility testing of B. hyodysenteriae. The minimal inhibitory concentration (MIC) was determined by the broth dilution procedure. The lowest antimicrobial activity was demonstrated for tylosin and lincomycin, with inhibition of bacterial growth using concentrations >128 μg/ml and 32 μg/ml, respectively. In the case of doxycycline, the MIC values were ≤ 2.0 μg/ml. No decreased susceptibility to tiamulin was found among the Polish isolates and MIC values for this antibiotic did not exceed 1.0 μg/ml. The results of the present study confirmed that Polish B. hyodysenteriae isolates were susceptible to the main antibiotics (tiamulin and valnemulin) used in treatment of swine dysentery. Further studies are necessary to evaluate a possible slow decrease in susceptibility to tiamulin and valnemulin of B. hyodysenteriae strains in Poland.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of real-time PCR for detection of Lawsonia intracellularis and Brachyspira hyodysenteriage in fecal samples from pigs
Autorzy:
Zmudzki, J.
Szczotka, A.
Podgorska, K.
Nowak, A.
Grzesiak, A.
Dors, A.
Pejsak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/30775.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of the study was to develop and validate real-time PCR method for the quantification of Lawsonia intracellularis and Brachyspira hyodysenteriae in porcine feces. Before the optimization process was performed two different extraction methods were compared to select the more efficient one. Based on the results achieved at this stage the boiling procedure was rejected and a commercially available silica-membrane based method was chosen for further analysis. The primers and the Taqman probe for B. hyodysenteriae and L. intracellularis were based on the sequence of NADH oxidase gene and 16S rDNA gene, respectively. The detection limit of the real-time PCR for suspension of feces inoculated with B. hyodysenteriae and L. intracellularis was determined to be 1.5x103 CFU/ml and 6.5x101 CFU/ml, respectively. The results of this study demonstrate that our real-time PCR is able to detect low number of B. hyodysenteriae and L. intracellularis cells which is satisfying in routine diagnosis of swine dysentery and proliferative enteropathy. Therefore, it is possible to identify both subclinically infected pigs and those representing an acute form of mentioned diseases. In summary, the quantitative real-time PCR is useful for routine diagnosis of L. intracellularis and B. hyodysenteriae. Compared to conventional PCR, the new validated quantification method based on real-time PCR is fast and with reduced risk of laboratory contamination. The novel technique is specific and even more sensitive than the previously used one. Furthermore, the new real-time PCR enables quick detection and quantification of both pathogens in fecal samples, which helps to estimate the health status of a pig herd.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Rolled Aluminium Alloy Products for the Automotive Industry
Nowe wyroby walcowane ze stopów aluminium dla przemysłu motoryzacyjnego
Autorzy:
Kłyszewski, A.
Żelechowski, J.
Frontczak, A.
Rutecki, P.
Szymański, W.
Zamkotowicz, Z.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/353701.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium alloys
clad aluminium strips
brazing
corrosion resistance
automotive industry
stopy aluminium
platerowane taśmy aluminiowe
lutowanie
odporność na korozję
przemysł motoryzacyjny
Opis:
Clad aluminium strips are used in the automotive industry to manufacture parts of heat exchangers. They are characterised by favourable strength properties, good corrosion resistance and susceptibility to plastic deformation, and can undergo surface brazing at a temperature of about 600°C. As a result of studies, the properties of alloys for the production of clad strips have been optimised. Optimising covered the alloy chemical composition and selected parameters such as the metal condition, the mechanical properties and anti-corrosion behaviour, including the methods for corrosion potential equalisation and sacrificial protection. The obtained technological results of the clad aluminium strip production were verified under the industrial conditions of Impexmetal Huta Aluminium Konin S.A. In a laboratory of the Institute of Non-Ferrous Metals (IMN), the clad strips were tested for the pre-assumed functional properties. Mechanical properties were tested, and the structure and corrosion behaviour were characterised. The reactivity of the clad layer was analysed under different technological conditions. The thermal bond produced by these clad layers was tested by simulation of the heat exchanger manufacturing process. As a result of the conducted research it has been found that all the essential characteristics of the clad strips produced under domestic conditions are in no way different from the properties of imported strips, while modification of the alloy chemical composition has contributed to the effective sacrificial protection of heat exchangers made from these strips. Clad aluminium strips are now successfully produced by the domestic aluminium industry. The improvement of materials used for the heat exchangers can contribute to the reduced overall dimensions of these products and increased efficiency, thus leading to energy savings. The results were obtained within the framework of the Task No. ZPB/38/66716/IT2/10 executed as part of the „IniTech” Project.
Aluminiowe taśmy platerowane znajdują zastosowanie w przemyśle motoryzacyjnym do produkcji elementów wymienni- ków ciepła. Charakteryzują się one korzystnymi właściwościami wytrzymałościowymi, dobrą odpornością na korozję i podatno- ścią do odkształcenia plastycznego oraz zdolnością do zgrzewania powierzchniowego w temperaturze około 600°C. W wyniku badań dokonano optymalizacji właściwości stopów przeznaczonych do produkcji taśm platerowanych. Zoptymalizowano skład chemiczny stopów oraz wybrane parametry takie jak stan materiału, właściwości mechaniczne i antykorozyjne z uwzględ- nieniem metody wyrównania potencjałów korozyjnych oraz metody ochrony protektorowej. Efekty technologii platerowanych taśm aluminiowych zostały pozytywnie zweryfikowane w warunkach przemysłowych Impexmetal S.A. Huta Aluminium Konin W warunkach laboratoryjnych IMN przetestowano wytworzone taśmy pod kątem założonych własności użytkowych. Zbadano własności mechaniczne taśm. scharakteryzowano ich strukturę i właściwości korozyjne. Dokonano analizy reaktywności plateru w różnych warunkach technologicznych oraz zbadano wytworzone z ich udziałem połączenia termiczne w warunkach symulacji procesu produkcji wymienników ciepła W wyniku przeprowadzonych badań stwierdzono, że wszystkie istotne właściwości taśm platerowanych wytworzonych w warunkach krajowych nie różnią się od właściwości taśm importowanych, a odpowiednia modyfikacja składu chemicznego stopów pizyczyniła się do zapewnienia skutecznej ochrony protektorowej wymienników cie- pła wytwarzanych z tych taśm. Aluminiowe taśmy platerowane wytwarzane są obecnie w krajowym przemyśle aluminiowym. Ulepszenie materiałów stosowanych do konstrukcji wymienników ciepła przyczynić się może do zmniejszenia gabarytów wy- mienników ciepła i zwiększenia ich sprawności, co prowadzić powinno do oszczędności energii. Wyniki uzyskano w Projekcie nr ZPB/38/66716/1T2/10 zrealizowanym w ramach przedsięwzięcia "IniTech”.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 393-396
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a Castings Quality and Metalworking Technology. Treasure of the Bronze Age Axes
Autorzy:
Garbacz-Klempka, A.
Kaczmarek, Ł.
Kwak, Z.
Kozana, J.
Piękoś, M.
Perek-Nowak, M.
Długosz, P.
Powiązania:
https://bibliotekanauki.pl/articles/382751.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-destructive testing
archeometallurgy
tin bronze
X-ray spectroscopy
castings defects
badania nieniszczące
archeometalurgia
brąz
spektroskopia rentgenowska
wady odlewów
Opis:
Cast axes are one of the most numerous categories of bronze products from earlier phases of the Bronze Age found in Poland. They had multiple applications since they were not only used objects such as tools or weapons but also played the prestigious and cult roles. Investigations of the selected axes from the bronze products treasure of the Bronze Age, found in the territory of Poland, are presented in the hereby paper. The holder of these findings is the State Archaeological Museum in Warsaw. Metallurgical investigations of axes with bushing were performed in respect of the casting technology and quality of obtained castings. Macroscopic observations allowed to document the remains of the gating system and to assess the range and kind of casting defects. Light microscopy revealed the microstructure character of these relicts. The chemical composition was determined by means of the X-ray fluorescence method with energy dispersion (ED-XRF) and by the scanning electron microscopy with X-ray energy dispersion analysis in micro-areas (SEM-EDS). The shape and dimensions of cores, reproducing inner parts of axes were identified on the basis of the X-ray tomography images. Studies reconstructed production technology of the mould with gating system, determined chemical composition of the applied alloys and casting structures as well as revealed the casting defects being the result of construction and usage of moulds and cores.
Źródło:
Archives of Foundry Engineering; 2018, 18, 3; 179-285
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of ZFN-mediated GGTA1 knock-out pigs by microinjection of gene constructs into pronuclei of zygotes
Autorzy:
Lipiński, D.
Nowak-Terpiłowska, A.
Hryhorowicz, M.
Jura, J.
Korcz, A.
Słomski, R.
Juzwa, W.
Mazurkiewicz, N.
Smorąg, Z.
Zeyland, J.
Powiązania:
https://bibliotekanauki.pl/articles/2087592.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Galα1
3Gal epitopes
pigs
xenotransplantation
genome edition
ZFNs
functional characteristics
Źródło:
Polish Journal of Veterinary Sciences; 2019, 1; 91-100
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies