Browsing by Issue Date, starting with "2006"

Now showing 1 - 20 of 542

Access status: Open Access ,
Stress analysis in helical springs with closed end coils machined from cylindrical sleeves
(Wydawnictwa AGH, 2006) Salawiński, Józef; Michalczyk, Krzysztof
The review of stress calculation methods in helical springs with rectangular cross-section wire is introduced in this paper. It is demonstrated that methods described in literaturę have various accuracy. Also, the modern construction of helical spring machined from tubular blanks is presented. It is indicated, using Finited Elements Me-thod, that existing for classical springs with opened ends stress calculating methods, are not suitable for springs with capped ends, because the stresses calculated from them are much smaller than the real ones.
Access status: Restricted ,
Socjologia
(Wydawnictwo Naukowe PWN, 2006) Giddens, Anthony
Access status: Open Access ,
Utilization of logging methods in geological drilling exploration in localities of Mostecka uhelna A.S.
(2006) Kurka, Miroslav; Mazáč, Josef; Šulcek, Petr; Sovíček, Slavomír; Řehoř, Michal
Geophysical logging methods represent very important part of geological research. Results gained by logging measurement are a very important addition to the information gained by laboratory analyses of the drill core. Utilization of logging methods in coal deposits is always a very expensive matter which requires to gain as much necessary information as possible from every measurement and laboratory analysis. This paper gives information about main logging method utilization in geological drilling exploration in localities of Mostecka uhelna, Inc.
Access status: Open Access ,
Bounds on the 2-domination number in cactus graphs
(2006) Chellali, Mustapha
A $2$-dominating set of a graph $G$ is a set $D$ of vertices of $G$ such that every vertex not in $S$ is dominated at least twice. The minimum cardinality of a $2$-dominating set of $G$ is the $2$-domination number $\gamma_{2}(G)$. We show that if $G$ is a nontrivial connected cactus graph with $k(G)$ even cycles ($k(G)\geq 0$), then $\gamma_{2}(G)\geq\gamma_{t}(G)-k(G)$, and if $G$ is a graph of order n with at most one cycle, then $\gamma_{2}(G)\geqslant(n+\ell-s)/2$ improving Fink and Jacobson's lower bound for trees with $\ell>s$, where $\gamma_{t}(G)$, $\ell$ and $s$ are the total domination number, the number of leaves and support vertices of $G$, respectively. We also show that if $T$ is a tree of order $n\geqslant 3$, then $\gamma_{2}(T)\leqslant\beta(T)+s-1$, where $\beta(T)$ is the independence number of $T$.
Access status: Open Access ,
Środowisko programowo-sprzętowe do akwizycji, przetwarzania i wizualizacji złożonych sygnałów w oparciu o układy FPGA nowej generacji
(Wydawnictwa AGH, 2006) Gorgoń, Marek
In the present paper digital standards applied for transmission and coding of a visual signal i.e. DVI, HDMI, IEEE1394, USB, Camera Link has been indicated. An increasing of image resolution and frame rate has been discussed for HDTV and DVI-based computer displays. An increase of the computing power necessary for performing image processing in HD vision systems has been noticed. A choosing of computing environment, which can assure necessary computing power, has been considered. Architecture of a system for acquisition, processing and visualization HD images and other complex signals, based on reconfigurable computing platform, cooperating with general-purpose processor has been presented. Particular components being parts of hardware-software stand have been briefly presented.
Access status: Open Access ,
The asymptotic properties of the dynamic equation with a delayed argument
(2006) Čermák, Jan; Urbánek, Miroslav
In this paper, we present some asymptotic results related to the scalar dynamic equation with a delayed argument. Using the time scale calculus we generalize some results known in the differential and difference case to the more general dynamic case.
Access status: Restricted ,
Elektrownie wiatrowe w systemie elektroenergetycznym
(Wydawnictwa Naukowo-Techniczne, 2006) Lubośny, Zbigniew
Access status: Open Access ,
Łagodzenie oraz skrócenie czasu procesu synchronizacji silników synchronicznych
(2006) Zalas, Paweł; Zawilak, Jan
Przedstawiono wyniki obliczeń procesu synchronizacji dla wybranego modelu dwubiegowego silnika synchronicznego typu GAe 1716/20t. Wykazano możliwości łagodzenia przebiegu procesu synchronizacji oraz skrócenia jego czasu przez sterowanie wartością prądu wzbudzenia. Zbadano wpływ przyjętych układów regulacji prądu magneśnicy na przebiegi tego procesu. Wyniki obliczeń zamieszczono w postaci wykresów czasowych.
Access status: Restricted ,
Elektroenergetyczne sieci miejskie : zagadnienia wybrane
(Oficyna Wydawnicza Politechniki Warszawskiej, 2006) Marzecki, Jerzy
Access status: Open Access ,
Możliwość wykorzystania składowych symetrycznych prądów stojana w diagnostyce wirnika silnika indukcyjnego klatkowego
(2006) Dybowski, Paweł
W artykule zostały przedstawione wyniki obliczeń widm składowych symetrycznych prądów stojana silnika indukcyjnego oraz ich analiza pod kątem przydatności tych widm w diagnostyce uszkodzeń silnika. Przedstawione wyniki uzyskano dla różnych przypadków uszkodzeń silnika lub wystąpienia niecentryczności statycznej lub dynamicznej. W prezentowanych widmach składowej zgodnej można zauważyć przypadku wystąpienia niecentryczności statycznej lub niecentryczności dynamicznej dodatkowe prążki w stosunku do widma prądu fazowego. Można przypuszczać, że na podstawie pojawienia się tych dodatkowych częstotliwości istnieje możliwość detekcji niecentryczności wirnika. Symulacje przeprowadzono dla zasilania symetrycznego i niesymetrycznego.
Access status: Open Access ,
Interdyscyplinarna współpraca w zakresie edukacji na rzecz ochrony krajobrazu kulturowego na przykładzie Parku Narodowego Cinque Terre (Włochy)
(Wydawnictwa AGH, 2006) Dobrowolski, Jan Wincenty; Jachimski, Józef; Hejmanowska, Beata ; Wagner, Aleksandra ; Boroń, Adam ; Drzewiecki, Wojciech ; Mikrut, Sławomir; Śliwka, Małgorzata; Mazur, Robert ; Jakubiak, Mateusz ; Patuła, Barbara
Our Faculty, as the only in Poland, participated in the EU project »Smart History«. A new concept of education, integrating the residents of the regions of particular natural and cultural values and tourists - for sustainable development. A group of staff, doctoral students and under-graduate students of the Faculty participated in the interdisciplinary Workshop in the Cinque Terre National Park (Italy). The participants represented 11 countries. The Region of the Park was a model area for the consultation of experts and local decision makers as well as the residents in the cultivation of traditional forms of life, necessary to protect a unique cultural landscape. The activities were directed towards the diminishing of the concentration of tourism at the coastal area by encouraging tourists to visit mountain areas. A particular subject of our interest was related to GIS in the context of the needs of the national park, mainly the development of tourism and nature conservation. Remote sensing and photogrammetry techniques as well as GIS have been developed in the Department of Photogrammetry and Remote Sensing Informatics. They can be successfully implemented for the needs of the Park. A map of vegetation/land use was made based on satellite data. This can make a starting point for the monitoring in the aspect of land use changes. Some examples of photogrammetric documentation of historical monuments in the Park were also made, including spherical panoramic images. From the tourist point of view it is important to publish the information, including GIS data in the Internet, which is also a subject of the studies of the Department. A website was made, focussed on the promotion of tourist paths in mountainous areas of the Park, presenting GIS data and interactive panoramic images. Many of the proposed solutions can be applied in other protected areas. The methodological experience in the implementation of sustainable development in national parks of other countries was used, including interdisciplinary science-educational work carried out in Poland since 1968.
Access status: Open Access ,
Wstępna analiza przemieszczeń punktów osnowy poziomej ESP Żar
(Wydawnictwa AGH, 2006) Bałut, Adam
The horizontal control network of the Żar hydropower facility is observed by the GPS technique since 2001. Comparison of results of five annual resurveys proved stability of the main observation pillars, used as a reference for determination of dam displacements and deformations. The network extends for about 5 km outside the artificial lake and stretches a probably active tectonic fault. The span of four years allowed determination of a 0.5 ppm/y compression in the area in the direction NE-SW, which does not contradict geophysical evidence.
Access status: Open Access ,
Criterions for the stability of the convex combination of polynomials
(Wydawnictwa AGH, 2006) Zalot, Ewelina
Necessary and sufficient conditions for Hurwitz (resp. Schur) stability of convex combination of two complex polynomials are introduced in the paper. The conditions are more general than those given in [2] and supplement work [3].
Access status: Open Access ,
Zastosowanie języka LOTOS do modelowania wybranych struktur metody HOOD
(2006) Brzuchacz, Rafał
W pracy zaprezentowano możliwości użycia języka LOTOS [3, 7] w projektowaniu oprogramowania systemów czasu rzeczywistego metodą HOOD [6, 13]. Wybrane struktury HOOD zostają wyrażone w języku algebry procesów i abstrakcyjnych typów danych, co zapewnia możliwość formalnej analizy tworzonego projektu. We wprowadzeniu do pracy wyjaśniono cel i motywacje do tworzenia modelu formalnego projektu systemu czasu rzeczywistego. Następnie przedstawiono skrócony opis metodyki hierarchicznego projektowania HOOD, której notacja i proces projektowy stanowią bazę dla proponowanej metody formalizacji. Wyjaśniono znaczenie takich konstrukcji, jak moduł, interfejs, operacja, hierarchia użycia i zawierania. W kolejnym punkcie, po krótkim przedstawieniu języka LOTOS [3, 7], zaprezentowano technikę, w której konstrukcje metody HOOD zostają zinterpretowane w języku formalnym algebry procesów i abstrakcyjnych typów danych. Opis przeprowadzony jest dla prostego przykładu projektu w HOOD, celem wyjaśnienia istoty interpretacji. W części końcowej pracy podano wnioski wraz ze wskazaniem dalszych możliwych kierunków rozwoju i zastosowań prezentowanej metody.
Access status: Open Access ,
Rozwój metod opracowania i analiza przydatności ortofotomap - doświadczenia Zakładu Fotogrametrii AGH
(Wydawnictwa AGH, 2006) Sitek, Zbigniew; Mierzwa, Władysław; Pyka, Krystian ; Wróbel, Andrzej
The Department of Photogrammetry, AGH possesses great experience in making orthophotomaps from surface, airborne and satellite images. First studies were carried out at the beginning of 1970s, after many years of improving analogue technology, it was replaced with digital technology. Apart from the very methodology of making orthophotomaps, their usefulness in the inventory of architectural and industrial objects was analysed as the base for the up-dating of the main map, inventory of grounds and buildings, and recently - the definition of the surfaces of plantations within the control of farmers' subsidies. The article presents the most interesting research and implementation studies referring to orthophotomaps done in the Department of Photogrammetry, AGH.
Access status: Open Access ,
Oddziaływanie osuwisk na gazociągi
(2006) Wilk, Stanisław; Galas, Marek; Mijal, Marek
If a gas pipeline has been deposited in an inclined ground and owing to the changed ground properties the creeping ground process started during exploitation, the conditions of gas pipeline exploitation radically change too. With time, the load exerted by the creeping ground on the gas pipeline increases, causing increased stresses in the pipe material. This results in a change of the gas pipeline axis and more prominent deformations in the pipeline material.
Access status: Open Access ,
Down-hole water sink technology for water coning control in wells
(2006) Wojtanowicz, Andrzej
Downhole Water Sink (DWS) technology has been developed from a new well completion and production method for enhancing productivity of wells in petroleum reservoirs with bottom water drive and strong tendency to water coning. DWS minimizes water invasion to the well's completion by employing hydrodynamic mechanism of coning control in-situ at the oil-water or gas-water contact. The mechanism is based upon a localized water drainage generated by another well completion (downhole water sink) installed in the aquifer beneath the oil-water or gas-water contact. The paper summarizes the development and state-of-the-art at DWS technology. Presented are results from theoretical studies, physical and numerical experiments, and field projects to date. It is demonstrated that DWS could increase recovery and control water production in vertical and horizontal oil wells - with natural flow, downhole pumps or gas lift, and in the gas wells from low-pressure tight gas reservoirs. Although by now DWS has been used in reservoirs with bottom water, theoretically the technology is also applicable in dipping structures with encroaching side-water.
Access status: Open Access ,
Zastosowanie sondowania statycznego w badaniach prowadzonych w PPiEZRiG Petrobaltic S.A.
(2006) Zajfert, Grzegorz
Marine geotechnical investigations should be run for such investments as suspension of the platform, gas pipelines installment, anchoring of overflow-moor buoys to the tanker, and designing hydrotechnical objects. Petrobaltic used a penetrometer Roson 10 T, installed on a ship m/v St. Barbara. The Dutch Penetrometer Roson 10 T A.P. V.d. Berg enables soil analyses in situ. The methods lie in sticking measurement cones into the ground with simultaneous digital recording physical and mechanical parameters of the sediments. The sounder can be also equipped with cones CPT and CPTU, and tester MOSTAP-65 with which undisturbed samples can be collected. Specific parameters and ground properties are registered during the measurement. These parameters enable determination of the geotechnical profile and carrying capacity of the sediments. This device is indispensable for evaluating mechanical properties of grounds whenever intact samples cannot be collected, e.g. from sandy sediments. The paper provides descriptions of research processes, where various difficulties may be encountered. The Author presents his own solutions and experience in preventing failure or measurement errors.
Access status: Restricted ,
Wprowadzenie do techniki : rola i miejsce techniki w gospodarce oraz życiu społecznym
(Redakcja Uczelnianych Wydawnictw Naukowo-Dydaktycznych AGH, 2006) Kubiński, Wiktor
Access status: Open Access ,
Określenie kryterium optymalnych parametrów pracy dysz zraszających do strącania pyłów z powietrza kopalnianego
(2006) Szponder, Tadeusz
Application of atomizer water is the main method of dust fighting from coalmine's atmosphere. Dust extraction effectiveness depends on parameters of atomized stream microstructure and cloud of dust. Dust removal effectiveness by spraying is the function of many parameters which are integrated in a ratio of drops surface in volume unit of atomized stream.