Wyniki wyszukiwania - Biblioteka Nauki

1

Wojenne losy lekarza weterynarii Tadeusza Ożgi, porucznika Wojska Polskiego zamordowanego w Katyniu

100%

Janiszewski A.

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nr 10

2

Problemy uczenia się wielopoziomowego w sieciach w świetle teorii działań

100%

Janiszewski A.

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tom z. 118

217--225

PL

Funkcjonowanie układów sieciowych umożliwiających uzyskiwanie dostępu do wiedzy lokalnej i światowej, a następnie jej transferowanie i współtworzenie nowych rozwiązań wpisuje się w obszar zainteresowań teorii uczenia się i tworzenia wiedzy. Oddziaływanie czynników istotnych dla powodzenia podejmowanych przedsięwzięć budowania zasobów wiedzy w oparciu o zasoby zewnętrzne na różnych poziomach w organizacji jak i na drodze relacji międzyorganizacyjnych jest coraz dokładniej wyjaśniane w oparciu o powszechnie wykorzystywane teorie uczenia się, kapitału społecznego, czy klasteringu. W artykule podjęto próbę zastosowania do opisu wskazanych zjawisk teorii działań celem zweryfikowania czy ta perspektywa poznawcza pozwala zadać nowe pytania i znaleźć ewentualne nowe wyjaśnienia dla procesów tak istotnych dla innowacyjności.

EN

Dual networks that are expected to enable organizations to gain access to both local and global knowledge and next to transfer and co-create new solutions are a field of interest of learning and knowledge creation theory. Key factors decide on the success of strategies that entail building organizational knowledge resources based on external resources located on both many different level within the organization and outside the organization and they are more and more thoroughly described by commonly known theories of learning, social capital or clustering. The paper aims at analyzing those phenomena making use of activity theory in order to verify whether this theoretical perspective allows researchers to ask new questions as well as to find possible new explanations for processes as important for the innovativeness as those under discussion in the paper.

3

Experimental determination of the activation energy of soot oxidation during regeneration process in diesel particulate filter

63%

Janiszewski A. , Teodorczyk A.

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tom Vol. 13, No. 2

143-153

EN

In the models of regeneration of diesel particulate filters the reaction rate of soot oxidation is assumed to be of Arrhenius type temperature dependence. In that form reaction rate has two characteristic coefficients: an activation energy and pre-exponential coefficient. The activation energy determines the increase of the rate of reaction with temperature in the reaction region. The pre-exponential factor depends on model and gives the unit of reaction rate. In the literature, there are many different values of the activation energy, which were determined at different test conditions. Our experimental studies were focused on creating test conditions very close to the real diesel particulate filter. The test bed consists of the ceramic plate covered with soot, which was put in the hot gas flow. The hot gas setups almost adiabatic condition for the reaction region. The flowing gas was the mixture of oxygen and nitrogen. During the experiments, the temperature above the plate and weight of the plate with soot were measured. For different temperatures of gas, we received various rates of soot depletion. The mass fraction of oxygen was changed too. Based on the collected data, the activation energy was calculated.

4

CFD modeling of the regeneration process in diesel particulate filter using fluent

63%

Janiszewski A. , Teodorczyk A.

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tom Vol. 13, No. 3

109-118

EN

Diesel engine particulate filters every year are becoming more popular. The new EURO 5 standard is very restrictive for particulates and this will force the use of particulate filter in every engine. Filters operate very good when they are loaded with small quantity of soot particles and they must be cleaned from time to time by burning out soot inside the filter. This process is called filter regeneration. During regeneration high temperature zones may occur in the filter which may change the properties of porous material and even cause its damage. The regeneration process should be effective at different engine operational conditions in which temperature and oxygen concentration vary. The experimental determination of optimal conditions for regeneration is very difficult and expensive. The simpler and less expensive is computer modeling. In this paper computer simulation of regeneration process of diesel particulate filter with the use of FLUENT code is described. A two-dimensional model assumes soot and filter wall as a porous materials of different permeability. The influence of soot parameters, filter material, composition and temperature of combustion products as well as activation energy on regeneration process was studied.

5

Rozpoznawanie radiologiczne przepukliny przeponowej - opis przypadku

51%

Paslawski R. , Janiszewski A. , Staszczyk M. , Cepiel A.

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nr 09

6

Ubytek w przegrodzie międzykomorowej u kota - opis przypadku

45%

Staszczyk M. , Paslawska U. , Noszczyk-Nowak A. , Janiszewski A. , Cepiel A.

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nr 06