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Wyświetlanie 1-15 z 47
Tytuł:
Prospects and Development of Vertical Normally-off JFETs in SiC
Autorzy:
Bakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/308249.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
JFET cascode
normally-off
SiC
vertical JFET
Opis:
This paper reviews the prospects of normally-off (N-off) JFET switch in SiC. The potential of selected vertical JFET concepts and all-JFET cascode solutions for N-off operation is analyzed using simulations. The performance of analyzed concepts is compared in terms of blocking voltage, specific on-state resistance, maximum output current density and switching performance in the temperature range from 25 C degree to 250 C degree. The main objective of the analysis is to ascertain consequences of different design and technology options for the total losses and high temperature performance of the devices.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 25-36
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Institution of Full Powers in the Process of Concluding International Agreements
Autorzy:
Bąkowski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2027868.pdf
Data publikacji:
2021-12-31
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
full powers, state representation
treaty law
international agreement
Opis:
This paper addresses issues related to the institution of full powers in the process of concluding international agreements. The author makes an analysis of the historical evolution of the institution of full powers and discusses the essential elements of the full powers instrument with regard to the representation of the state and international organizations, taking into account current international law regulations. In this regard, the author also refers to international practice and, based on a review of the scholarly literature, attempts to classify full powers.
Źródło:
Adam Mickiewicz University Law Review; 2021, 13; 97-117
2450-0976
Pojawia się w:
Adam Mickiewicz University Law Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Is upper gastrointestinal bleeding still a life-threatening condition?
Autorzy:
Janczak, D.
Marschollek, P.
Marschollek, K.
Owczarzak, M.
Bakowski, W.
Bakowska, K.
Chabowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1719.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Opis:
Background: Upper gastrointestinal bleeding is a common clinical problem and one of the main reasons for emergency hospitalization. It is associated with an overall mortality rate of 2% to 13%, despite advances in medical therapy. First-choice management is conservative treatment with endoscopic hemostasis. Aim of the study: The aim of the study was to examine the epidemiological and clinical characteristics of patients with upper gastrointestinal bleeding with a focus on the course of hospitalization based on the etiology Material and methods: A retrospective study was conducted in the Department of Surgery at the 4th Military Teaching Hospital in the years 2011–2016, comprising a total of 200 hospitalizations. 150 (75%) of the study group were men, and the mean age was 63.6±15.8 years. Results: Patients most frequently presented with melena (n=105; 53.1%) and hematemesis (n=79; 40%) or coffee ground vomiting (n=57; 28.7%). . 138 (69%) of hemorrhages were managed with endoscopic hemostasis, and in 43 (21.5%) of cases conservative treatment was adequate. In 12 (6%) of cases, laparotomy was the first-choice therapy and in 7 (3.5%) cases, surgery was performed after an attempt at endoscopic treatment had failed. The sources of bleeding were: gastric ulcer – 58 (29%), duodenal ulcer – 48 (24%), esophageal varices – 31 (15.5%), gastric tumor – 15 (7.5%), Mallory-Weiss syndrome – 10 (5%), and Dieulafoy’s lesion – 3 (1.5%). 16 (8%) of the hospitalizations were fatal. Conclusions: Upper gastrointestinal bleeding still has a high mortality rate (8%). It more frequently affects men and the elderly. Gastric and duodenal ulcers are the most common etiologies of bleeding. Esophageal varices and neoplasms are also a significant source of bleeding. Despite the progress in the pharmacological treatment of peptic ulcers, the complications resulting from gastrointestinal bleeding continue to be a serious clinical problem.
Źródło:
Medical Science Pulse; 2019, 13, 2
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Mechanism of Spheroidal Cast Iron Piston Ring-Aluminum Matrix Composite Cylinder Liner Contact
Autorzy:
Bąkowski, H.
Powiązania:
https://bibliotekanauki.pl/articles/352888.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
spheroidal graphite
wear mechanism
stereological parameters
Opis:
The paper presents the results of research on the impact of stereological characteristics of microstructure of graphite in nodular GJS-400 cast iron and Al2 O3 fibers in the composite AC-47000 + 10% Al2 O3 F on the mechanism of wear in a cast iron piston ring – composite cylinder liner contact in a combustion engine. To elucidate the mechanisms of wear in the tested contact was used Finite Element Method (FEM). On the basis of quantitative metallographic examination of test materials were determined stereological parameters of their structures. It was necessary for the implementation of the 3D model that reflects the actual structure with particular focus on the different phases in order to determine the distribution of stresses and strains. The determination Strains of the local stresses value of allowed the prediction of wear initiating places. Formation of stereological parameters of cast iron in the technological process allows a prediction of values and distributions of the stresses/strains and thus reduce wear and extend durability of the analyzed contact.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 481-490
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urban tidal flow noise - case study
Autorzy:
Bąkowski, Andrzej
Radziszewski, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/24201984.pdf
Data publikacji:
2023
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
urban noise
traffic flow
monitoring station data
hałas miejski
ruch uliczny
dane ze stacji monitoringu
Opis:
The study carried out an analysis of the urban traffic noise from 2011 to 2016 at Kielce (Poland). The results of noise simulations according to the Cnossos-EU model were compared with the sound level calculated by monitoring station and a very good agreement was obtained. The mean absolute error was smaller than 1 dB(A). For weekdays the charts shape at individual hours of the day were shown to be similar. However, one can notice a different shape of this charts from the morning peak on Friday to the end of the weekend and especially on Saturday and Sunday.
Źródło:
Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023119
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of 3C-SiC MOSFETs
Autorzy:
Bakowski, M.
Schöner, A.
Ericsson, P.
Strömberg, H.
Nagasawa, H.
Masayuki, A.
Powiązania:
https://bibliotekanauki.pl/articles/308791.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
vertical MOSFET
3C-SiC
channel mobility
Opis:
The paper reviews the development of the 3C-SiC MOSFETs in a unique development project combining the material and device expertise of HAST (Hoya Advanced Semiconductor Technologies) and Acreo, respectively. The motivation for the development of the 3C-SiC MOSFETs and the summary of the results from the lateral and vertical devices with varying size from single cell to 3×3 mm2 large devices are reviewed. The vertical devices had hexagonal and square unit cell designs with 2 žm and 4 žm channel length. The p-body was aluminum implanted and the source was nitrogen or phosphorus implanted. Low temperature Ti/W contacts were evaluated.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 2; 49-56
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibroacoustic Real Time Fuel Classification in Diesel Engine
Autorzy:
Bąkowski, A.
Kekez, M.
Radziszewski, L.
Sapietova, A.
Powiązania:
https://bibliotekanauki.pl/articles/177686.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuel recognition
classification trees
particle swarm optimization (PSO)
random forest
Opis:
Five models and methodology are discussed in this paper for constructing classifiers capable of recognizing in real time the type of fuel injected into a diesel engine cylinder to accuracy acceptable in practical technical applications. Experimental research was carried out on the dynamic engine test facility. The signal of in-cylinder and in-injection line pressure in an internal combustion engine powered by mineral fuel, biodiesel or blends of these two fuel types was evaluated using the vibro-acoustic method. Computational intelligence methods such as classification trees, particle swarm optimization and random forest were applied.
Źródło:
Archives of Acoustics; 2018, 43, 3; 385-395
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Open source code : „Between West & East”
Otwarty kod źródłowy : "Pomiędzy Wschodem a Zachodem"
Autorzy:
Bakowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/91246.pdf
Data publikacji:
2011
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
open source code
digital technologies
software
otwarty kod źródłowy
technologie numeryczne
oprogramowanie systemowe
Opis:
The digital technologies based on digital hardware and software are driving the second industrial revolution; more than 12% of Gross World Product are related to IT. The economy of most European countries is too small to compete with global software companies and digital hardware producers, some of them being under the indirect control of sovereign powers. In this context we underline the necessity of building national software competences in open software components and systems. Nationally developed and controlled operating systems, security software and professional software seem to be the only way to escape the economic constraints and potential security threats from external actors.
Technologie numeryczne są zbudowane na bazie sprzętu i oprogramowania, i jako takie są motorem drugiej rewolucji przemysłowej. Ponad 12% światowego dochodu generują technologie informacyjne. Jednakże gospodarki większości krajów europejskich są za słabe żeby konkurować z globalnymi firmami softwarowymi i producentami sprzętu numerycznego. Niektóre z tych firm są pod pośrednią kontrolą innych państw. W tym kontekście podkreśla się konieczność budowy oprogramowania krajowego opartego na open source software. Krajowe oprogramowanie systemowe, programy ochrony i oprogramowanie profesjonalne wydają się być jedynym środkiem uniknięcia uwarunkowań ekonomicznych i potencjalnych zagrożeń pochodzących z zewnątrz kraju.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2011, 5, 6; 8-13
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantitative and Qualitative Comparison of Tribological Properties of Railway Rails with and without Heat Treatment
Autorzy:
Bąkowski, H.
Piwnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/351381.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fatigue wear
wear products
crack
metallographic examination
operational factors
Opis:
The paper provides a comprehensive presentation of the influence of operating parameters on the tribological properties of the wheel-rail couple. Apart from wear and a friction coefficient, the tribological properties also comprise stereological parameters of flaky wear products. The tribological tests were carried out according to an experimental plan, which took account of the complex influence of operational factors on the size and shape of flaky wear products. This enabled defining the type and intensity of wear, depending on the variable operational parameters. In order to explain the wear mechanism, quantitative, qualitative, and profilographometric metallographic examinations were made.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 469--474
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roadmap for SiC power devices
Autorzy:
Bakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/309314.pdf
Data publikacji:
2000
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
SiC power devices
roadmap for
status
development trends
unipolar and bipolar SiC devices
super junction devices
applications
system benefits
current handling capability
simulations
Opis:
Silicon carbide (SiC) power devices offer significant benefits of improved efficiency, dynamic performance and reliability of electronic and electric systems. The challenges and prospects of SiC power device development are reviewed considering different device types. A close correlation between an exponential increase of current handling capability during recent five years and improvement in substrate quality is demonstrated. The voltage range of silicon and SiC unipolar and bipolar power devices with respect to the on-state voltage is determined based on device simulation. 4H-SiC unipolar devices are potentially superior to all silicon devices up to 10 kV.4H-SiC unipolar devices are superior to all SiC bipolar devices up to 8÷9 kV. The low end of SiC unipolar devices is determined to be around 200 V provided substrate resistance is reduced by thinning the substrate down to 100 žm. The influence of reduced channel mobility on the specific on-state resistance of 4H-Sic DMOSFETs and UMOSFETs is shown. It has been demonstrated that 6H-SiC DMOSFETs could be a better choice compared to 4H-SiC MOSFETs in the voltage range below 600 V utilising better channel mobility obtainable so far on 6H-SiC polytype. An impact of super junction (SJ) concept on silicon and SiC MOSFET specific on-resistance limits is demonstrated.
Źródło:
Journal of Telecommunications and Information Technology; 2000, 3-4; 19-30
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of shaft wear in turbocharges of automotive vehicles
Autorzy:
Hadryś, Damian
Bąkowski, Henryk
Stanik, Zbigniew
Kubik, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/375421.pdf
Data publikacji:
2019
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
charging
internal combustion engine
turbocharger
friction
lubrication
ładowanie
silnik spalinowy
turboładowanie
tarcie
smarowanie
Opis:
The article presents the results of the investigations of turbocharger shaft bearing using different kinds of lubrication conditions (dry friction and lubrication with different kind of oils). In particular, the wear of the turbocharger shaft surface was evaluated. One of the most frequent failures is the seizure of the turbocharger shaft in the slide bearing, causing its rotation, which leads to destruction of the assembly and costly repairs. On the basis of the conducted tests, it was found that the average value of representative breaks surface on the turbocharger shaft are reduced using of a less viscous oil. Similar situation was seen using new oil instead overworked oil – it had an influence on the value of diameter of breaks.
Źródło:
Transport Problems; 2019, 14, 3; 85-95
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current status of Early Warning Systems for severe environmental threats in the Polish National Meteorological Service
Autorzy:
Bąkowski, R.
Achimowicz, J.
Mazur, A.
Powiązania:
https://bibliotekanauki.pl/articles/108492.pdf
Data publikacji:
2014
Wydawca:
Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
Tematy:
early warning system
hazards
incidents
warning
weather forecast
Opis:
The current state of the art and dedicated applications in Early Warning Systems (EWS) of hydrological and meteorological threats are presented herein. Special emphasis is placed on systems based on the post-processing of deterministic numerical weather forecasts in the real-time mode. The importance of climate and weather forecasting models in providing warnings against slow and rapid onset rates e.g. drought and dispersion of atmospheric pollutants respectively, is discussed. It is strongly suggested that there is a need for systems, corresponding to crisis situations in the field of environmental hazards and/or human activities in general, that would be able to provide support and information about further possible scenarios with a projected state of both the environment and the possibility of the negative impact of various factors on the population (human communities). Since there are highly developed plans for the construction of a nuclear power plant in Poland, there is an urgent need to prepare adequate tools that will help avoid crisis situations, or at least to minimize their negative effects. The Early Warning System should be considered one such tool, to be used not only for its economic benefits, but also for pro-social areas of services responsible for the appropriate reaction to crisis events.
Źródło:
Meteorology Hydrology and Water Management. Research and Operational Applications; 2014, 2, 2; 35-42
2299-3835
2353-5652
Pojawia się w:
Meteorology Hydrology and Water Management. Research and Operational Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Culinary herbs - the nutritive value and content of minerals
Autorzy:
Kiczorowska, B.
Klebaniuk, R.
Bakowski, M.
Al-Yasiry, A.R.M.H.
Powiązania:
https://bibliotekanauki.pl/articles/13626.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
herb
culinary herb
nutritional value
mineral content
chemical composition
Opis:
The content of dry matter, total protein, ether extract, crude ash and crude fibre was determined in the plant material. In addition, the BAW was calculated and the content of: Mg, Ca, K, Na, Fe, Cu, Mn and Zn was assessed. The highest (P < 0.05) concentration of nutrients in dry matter was characteristic of fennel flower and green pepper.The highest abundance of minerals in crude ash was found in lovage and marjoram (144.4-116.6 g kg-1), and of total protein – in common basil and lovage (208.8 and 185.4 g kg-1). The highest (P < 0.05) content of crude fat was determined in common juniper, nutmeg, green pepper, marjoram and rosemary (on average 17.18 g kg-1) and of fibre in coriander (107.2 g kg-1), while the highest BAW was recorded in nutmeg, white pepper and rosemary (on average 730.9 g kg-1). The % RDA and AI coverage were estimated for consumers aged 31-50, assuming that the intake of the analysed culinary herbs is equivalent to 1g per day. The herbs had highly differentiated content of the analysed minerals. Common basil contained the highest amounts (P < 0.05) of macroelements: Mg, Ca, K and Na (79.8, 1278, 2135 and 218.5 μg g-1, respectively) and microelements: Fe, Cu and Mn (26.31, 1.95 and 8.56 μg g-1, respectively). Of all the herbs, fennel flower was the most abundant (P < 0.05) source of Zn (74.53 μg g-1), while juniper and green pepper was the richest in Mg (an average content 86.8 μg g-1), marjoram and lovage – in Ca (1666 and 1041 μg g-1 respectively), and red pepper – in K (2114 μg g-1). According to calculations, the consumption of 1 g of the above herbs can cover up to approx. 0.1% of RDA (Mg, Ca,) and AI (K, Na) and up to 0.6% of RDA (Fe, Cu, Mn, Zn).
Źródło:
Journal of Elementology; 2015, 20, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urban traffic noise of heavy vehicles in octave bands
Autorzy:
Bąkowski, Andrzej
Dekýš, Vladimir
Radziszewski, Leszek
Świetlik, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2146625.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
urban noise
CNOSSOS-EU method
heavy vehicles
hałas miejski
metoda CNOSSOS-EU
pojazdy ciężarowe
Opis:
In this paper same results of heavy vehicles traffic measurements were used to simulate the noise measurands by the CNOSSOS-EU method for this purpose. The heavy vehicles traffic volume and velocity were recorded by permanent automatic monitoring station. The noise was calculated in octave bands according to the CNOSSOS-EU method. The positional and not positional measures of traffic noise were proposed for data scattering. The results was described using parameters such as the median, average peak noise, average maximum noise, average background level, first and third quartiles and relative measures of noise. Analyzes carried out for the tested section of the road showed that the traffic of heavy vehicles is not always the main source of road noise. It has been shown that maximum values of the acoustic pressure occur for the frequency of f0 = 500 Hz. The dispersion of noise and type A uncertainty of the results were evaluated.
Źródło:
Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020103
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of processing on nutritional quality of bean seeds (Phaseolus vulgaris L.)
Wpływ przetwórstwa na wartość odżywczą nasion fasoli (Phaseolus vulgaris L.)
Autorzy:
Kosson, R.
Bakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398755.pdf
Data publikacji:
1986
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
oligosaccharides
bean seeds processing
Opis:
Studies on the oligosaccharides content, raffinose and stachyose in the bean seeds were carried out and the effect of soaking and cooking on their content in four varieties of bean cultivated for dry seeds was examined. Protein and dry matter losses during processing were also evaluated. It was found that the bean soaking and cooking in water resulted in a reduction of raffinose and stachyose content in the seeds up to 50% and of protein up to 10%. Protein losses at increasing soaking temperature were inversely proportional to the protein losses during subsequent cooking of the bean.
Przeprowadzono badania nad wpływem moczenia i gotowania nasion na zawartość oligosacharydów, rafinozy oraz stachiozy w 4 polskich odmianach fasoli uprawianej na suche ziarno: Piękny Jaś, Biała Wyborowa, Słowianka i Igołomska. Określono również wpływ temperatury moczenia: 20, 30 i 40°C oraz dalszego gotowania na straty białka i suchej masy w fasoli. Zawartość rafinozy w nasionach suchych wahała się - zależnie od odmiany - od 0,24 do 0,70%, a stachiozy od 2,00 do 2,50%. Stopień ekstrakcji tych cukrów z nasion w czasie moczenia i gotowania zależał od odmiany fasoli i sięgał 50°/o wyjściowej zawartości tych cukrów (tab. 1). Wzrost temperatury moczenia wpływał na wyższe straty białka i suchej masy. Straty białka wahały się od 0,89 do 10,74% (tab. 2), a suchej masy od 0,69 do 12,12% (tab. 3). Straty białka przy wzroście temperatury moczenia nasion niektórych odmian fasoli były odwrotnie proporcjonalne do wielkości strat białka w czasie dalszego gotowania.
Źródło:
Acta Alimentaria Polonica; 1986, 12, 3-4; 197-204
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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