Show publications from the year
-
Show all publications from the year 2025
-
Show all publications from the year 2024
-
Show all publications from the year 2023
-
Show all publications from the year 2022
-
Show all publications from the year 2021
-
Show all publications from the year 2020
-
Show all publications from the year 2019
-
Show all publications from the year 2018
-
Show all publications from the year 2017
-
Show all publications from the year 2016
-
Show all publications from the year 2015
-
Show all publications from the year 2014
-
Show all publications from the year 2013
-
Show all publications from the year 2012
-
Show all publications from the year 2011
-
Show all publications from the year 2010
-
Show all publications from the year 2009
-
Show all publications from the year 2008
-
Show all publications from the year 2007
-
Show all publications from the year 2006
-
Show all publications from the year 2005
-
Show all publications from the year 2004
-
Show all publications from the year 2003
-
Show all publications from the year 2002
-
Show all publications from the year 2001
-
Show all publications from the year 2000
-
Show all publications from the year 1999
-
Show all publications from the year 1998
-
Show all publications from the year 1988
-
Show all publications from the year 1987
-
Show all publications from the year 1980
Publications from the year 2011
Show all-
Efektywność dobetonowania krótkich wsporników do istniejącego słupa żelbetowego
- Krystyna Nagrodzka-Godycka
- Małgorzata Lachowicz
-
Efektywność naukowa uczelni publicznych
- Aleksandra Parteka
- Joanna Wolszczak-Derlacz
Artykuł prezentuje kluczowe wnioski z badań będących podstawą raportu "Produktywnośćnaukowa wyższych szkół publicznychw Polsce. Bibliometryczna analizaporównawcza''. W badaniu przeanalizowano grupę291 europejskich uczelni publicznychw latach 1995-2008. W badaniu ujęto34 uczelnie z Polski (uniwersytety orazpolitechniki), porównując ich aktywnośćpublikacyjną do szkół wyższych z Austrii,Finlandii, Niemiec, Włoch, Szwajcariii Wielkiej Brytanii. Przeanalizowanoilość publikacji w uznanych periodykachnaukowych z pozytywnym wskaźnikiemimpact factor (indeksowanych w bazieThomson Reuters ISI Web of Science,gromadzącej publikacje z tzw. listy filadelfijskiej),autorstwa osób afiliowanychw poszczególnych uczelniach.
-
Efektywność odzysku energii w komunikacji trolejbusowej
- Mikołaj Bartłomiejczyk
- Zygmunt Giętkowski
W artykule przedstawiono analizę różnych sposobów ograniczenia zużycia energii w komunikacji miejskiej na przykładzie trolejbusów. Obliczenia wykonano metodą Monte Carlo.
-
Effect of adhesive compliance in the assessment of soft adhesives with the wedge test
- Michał Budzik
- Julien Jumel
- Krystyna Imielińska
- Martin Shanahan
Wedge tests are usually analysed assuming that the free, unbonded members may be treated as encastré cantilever beams. However, if the adhesive layer is sufficiently flexible (e.g., due to low elastic modulus), then significant strain in the bonded region may occur and lead to modification of the behaviour outside this region. Using in conjunction a sensitive strain gauge method on asymmetric wedge tests and a mathematical analysis developed from the work of Winkler, we conclude that the standard, simple beam theory approach significantly overestimates crack length for a supple adhesive layer. The present contribution mainly considers strain effects in the intact, bonded zone, rather than fracture per se. However, it is concluded that,if in fracture tests, the incorrect values of crack length obtained from the encastré beam assumption are employed to calculate fracture energy using the simpler model, there will be some self-compensation and little error in estimates of the latter will result (at least in the cases presently studied).
-
Effect of adopted rules of inference and methods of defuzzification on the final result of the evaluation of reliability made using the fuzzy logic methods
- Roman Liberacki
The object of interest is to solve the problem of risk management of marine systems. But the main trouble is a lack of numerous and sure data on the reliability of the components of such systems. The methods based on the fuzzy logic seem to be helpful here. The goal of the article is to check the effect of using different fuzzy inference rules and methods of defuzzification on the final result of reliability assessment. The three rules of inference are taken intoaccount: the Mamdani rule, the Larsen rule and the Tsukamoto rule. The second problem is the method of defuzzification of the result given in the form of fuzzy number into the real number. The several methods of defuzzification are discussed. The examples of using the above inference rules and defuzzification methods arepresented.
-
Effect of alkyl sulfate on the phase behavior of microemulsions stabilized with monoacylglycerols
- Halina Szeląg
- Patrycja Szumała
In this study the effect of an anionic surfactant (sodium dodecyl sulfate SDS) and oils (hydrocarbons: C12-C16) on the formation and phase behavior of the systems of oil/monoacylglycerols (MAG):SDS/propylene glycol/water has been investigated. The effects of the surfactant mixture on the phase behavior and the concentrationof water or oil in the systems were studied at three temperatures (50, 55, 60 C). Electrical conductivity measurement, FT-IR spectroscopy and differential scanning calorimetry methods were applied to determine the structure and type of the microemulsions formed. The dimension of microemulsion droplets was characterizedby dynamic light scattering. It has been stated that the concentration of SDS has a strong influence on the shape and extent of the microemulsion areas. Addition of an ionic surfactant to the mixture with MAG promotes an increase in the area of microemulsion formation in the phase diagrams, and these areas of the isotropic region change with the temperature. It was shown that the presence in the systems of a surfactant more hydrophilic than MAG caused an increase in water content in the microemulsions. It was found that, depending on temperature and concentration of the surfactant mixture, it was possible to obtain a W/O type microemulsion with a dispersed particles size distribution ranging from 20 to 50 nm and containing about 17-38% water in the system. Among different alkanes (from C12 toC16), hexadecane embedded microemulsions showed a maximum water solubilization capacity.
-
Effect of buffer layers on performance of organic photovoltaic devices based on copper phthalocyanine-perylene dye heterojunction
- Ryszard Signerski
- Grażyna Jarosz
Praca przedstawia wyniki badań układu fotowoltaicznego złożonego z cienkich warstw organicznych tworzących złącze (CuPc i MePTCDI), elektrod (ITO i Ag) oraz z warstw buforowych (MoO3 przy ITO i BCP przy Ag).
-
Effect of grain crushing on shear localization in granular bodies during plane strain compression. Int. J. Numerical and Analytical Methods in Geomechanics
- Andrzej Tejchman-Konarzewski
- Jarosław Górski
- I. Einav
Artykuł omawia wpływ miażdżenia ziaren na lokalizacje odkształceń stycznych w materiałach granulowanych podczas ściskania dwuosiowego. Obliczenia MES wykonano przy zastosowaniu mikropolarnego prawa hipoplastycznego uwzględniającego zmianę średniej średnicy ziarna pod wpływem ciśnienia i ścinania. Obliczenia pokazały wpływ miażdżenia ziaren na szerokość lokalizacji.
-
Effect of oxygenation time on signal of a sensor based on ionic liquids
- Jacek Gębicki
- Adam Kloskowski
- Wojciech Chrzanowski
The paper presents an oxygen sensor based on ionic liquids and solid electrodes. The following ionic liquids have been employed: [BMIM][BF4], [HMIM][Cl], [BMIM][N(CN2)]. Minimum time of the sensor exposure to analyte, after which the signal (current intensity) was stable, has been evaluated. An impact of volumetric flow rate of analyte on the sensor exposure time and signal has been determined. A product of permeability coefficient and solubility of oxygen in ionic liquids has been estimated. A mechanism of oxygen reduction on a surface of the solid electrodes, in the ionic liquid environment has been presented. Overall cathodic coefficients of transition for the sensors with particular ionic liquids have been determined as a function of potential scan rate.
-
Effect of shielded electrode wet welding conditions on diffusible hydrogen content in deposited metal
- Dariusz Fydrych
- Grzegorz Rogalski
Wet welding is the most popular method of joining in water enviroment. During underwater welding, the weldability of steel is limited by the higher cooling rates and hydrogen content in weld metal. Article presents results of preliminary tests on the effects of wet welding conditions on diffusible hydrogen amount. Seven parameters were optimized using a Plackett-Burman plan to get the most relevant variables. These parameters were: salinity of water, contamination of electrode, electrode polarity and welding current.
-
Effective Data-Centric Reputation Systems for MANETs: A Novel Evaluation Framework
- Jerzy Konorski
Zaprezentowano datacentryczny system reputacyjny dla sieci bezprzewodowej ad hoc z transmisją wieloskokową oraz metodę jego oceny opartą na wskaźniku efektywności. Wskaźnik ten odzwierciedla wymienność pomiędzy odróżnialnością węzłów egoistycznych od pozostałych oraz stopniem wykazywanego przez nie egoizmu. Dla przyjętego modelu sieci przedyskutowano analitycznie znaczenie znajomości tras i metryk reputacyjnych przez węzły.
-
Effective length of lightning protection earthings
- Stanisław Wojtas
System uziemień współczesnych obiektów jest zwykle bardzo rozległy, a na łączenie poszczególnych elementów uziemiających za pomocą głównej szyny wyrównania potencjałów uwzględnia także uziemienia stacji transformatorowej. Ocena przydatności takiego systemu uziemień do celów ochrony odgromowej nie jest prosta, bo tylko jego część określana, jako długość efektywna bierze udział w odprowadzaniu do gruntu prądu piorunowego. Praca zawiera rezultaty obliczeń długości efektywnej uziomów oraz wyniki symulacji komputerowych, pomiarów na modelach analogowych, a także na rzeczywistych uziomach poziomych. W badaniach były stosowane udary o czasach czoła 1, 4 i 10 mikrosekund. Uzyskano dobrą zgodność rezultatów obliczeń i symulacji z wynikami pomiarów na obiektach rzeczywistych.
-
Effects of Sr/Ti stoichiometry in SrTiO3-based SOFC anodes
- Beata Bochentyn
Scharakteryzowano wpływ stechiometrii Sr/Ti na właściwości strukturalne, elektryczne i mechaniczne anod na bazie tytanianu strontu. Wyjaśniono genezę niektórych zjawisk w oparciu o chemię defektów związków niestechiometrycznych na bazie istniejących pozycji literaturowych.
-
Effects of subfilter velocity modelling on dispersed phase in LES of heated channel flow
- Jacek Pozorski
- Maria Knorps
- Mirosław Łuniewski
A non-isothermal turbulent flow with the dispersed phase is modelled using the Large Eddy Simulation (LES) approach for fluid, one-way coupled with the equations of point-particle evolution. The channel is heated at both walls and isoflux boundary conditions are applied for fluid. Particle velocity and thermal statistics are computed. Of particular interest are the r.m.s. profiles and the probability density function of particle temperature in the near-wall region. We compare our findings with available reference data for particle-laden, heated channel flow. Moreover, an open issue in LES is the influence of non-resolved (residual) scales of fluid velocity and temperature fields on particles. In the present contribution, we apply a stochastic model for subfilter fluid velocity at the particle positions that aims at reconstructing the effects of the smallest scales of turbulence on particle dynamics. We analyse the impact of this model on particle thermal statistics.
-
Effets de variabilite d'adhesion et de viellissement en collage structural
- Martin Shanahan
- Julien Jumel
- Michał Budzik
Divers essais peuvent etre employes afin d'evaluer la resistance a la fracture des joints adhesifes. Generalement, ces essais sont symetriques: les substrats sont identiques. Nous avons utilise une version asymetrique, ou un adherend flexible est colle a aderend rigide. Nous discutons ici du comportement d'un joint d'adhesion variable. Des resultats assez surprenants font le sujet prinicpal de cet article.
-
Efficiency of acoustic heating in the Maxwell fluid
- Anna Perelomova
- Weronika Pelc-Garska
The nonlinear effects of sound in a fluid describing by the Maxwell model of the viscous stress tensor is the subject of investigation. Among other, viscoelastic biological media belong to this non-newtonian type of fluids. Generation of heating of the medium caused by nonlinear transfer of acoustic energy, is discussed in details. The governing equation of acoustic heating is derived by means of the special linear combination of conservation equations of fluid motion in differential form. The method to derive the governing equations does not need averaging over the sound period, and the final governing dynamic equation of the thermal mode is instantaneous. It is valid for both periodic and aperiodic sound. The efficiency of acoustic heating for different shapes of acoustic wave is evaluated.
-
Efficiency of acoustic heating in the Maxwell fluid
- Anna Perelomova
- Weronika Pelc-Garska
The nonlinear effects of sound in a fluid describing by the Maxwell model of the viscous stress tensor is the subject of investigation. Among other, viscoelastic biological media belong to this non-newtonian type of fluids. Generation of heating of the medium caused by nonlinear transfer of acoustic energy, is discussed in details. The governing equation of acoustic heating is derived by means of the special linear combination of conservation equations of fluid motion in differential form. The method to derive the governing equations does not need averaging over the sound period, and the final governing dynamic equation of the thermal mode is instantaneous. It is valid for both periodic and aperiodic sound. The efficiency of acoustic heating for different shapes of acoustic wave is evaluated.
-
Efficiency of European public higher education institutions: a two-stage multicountry approach
- Joanna Wolszczak-Derlacz
- Aleksandra Parteka
The purpose of this study is to examine efficiency and its determinants in a set of higher education institutions (HEIs) from several European countries by means of non-parametric frontier techniques. Our analysis is based on a sample of 259 public HEIs from 7 European countries across the time period of 2001-2005. We conduct a two-stage DEA analysis (Simar and Wilson in J Economet 136:31-64, 2007), first evaluating DEA scores and then regressing them on potential covariates with the use of a bootstrapped truncated regression. Results indicate a considerable variability of efficiency scores within and between countries. Unit size (economies of scale), number and composition of faculties, sources of funding and gender staff composition are found to be among the crucial determinants of these units' performance. Specifically, we found evidence that a higher share of funds from external sources and a higher number of women among academic staff improve the efficiency of the institution.
-
Efficiency of pollutant removal by five multistage constructed wetlands in a temperate climate
- Magdalena Gajewska
- Hanna Obarska-Pempkowiak
In recent years, an increase in interest in hybrid constructed wetland systems (HCWs) has beenobserved. These systems are composed of two or more filters with different modes of sewage flow.Based on over eight years of monitoring, carried out at five local HCWs located in the PomeraniaRegion of Northern Poland, the effective removal of organic matter (from 74.9 to 95.5% COD) in theloading range 1.5-17.0 g COD·m-2·d-1 was confirmed. Efficiency of total nitrogen (TN) removal variedfrom 23.4 to 79.2%. The most effective removal of TN (2.0 g·m-2·d-1) occurred in the systemwith vertical flow compartments with intermittent loadings
-
Efficient and Systematic Solution of Real and Complex Eigenvalue Problems Employing Simplex Chain Vertices Searching Procedure
- Jerzy Julian Michalski
- Piotr Kowalczyk
W artykule zaprezentowano nowatorską metodę, pozwalającą w bardzo efektywny sposób rozwiązywać rzeczywiste i zespolone zagadnienia własne (które przekształcić można w równania nieliniowe) często spotykane w elektrodynamice obliczeniowej. Idea metody oparta jest o śledzenie miejsc zerowych otrzymanego równania nieliniowego. W proponowanej technice zastosowano regularne wielościany, budując z nich łańcuch (ścieżkę) poszukiwanych miejsc zerowych.Proponowany algorytm jest optymalny pod względem liczby ewaluacji funkcji. W celu wykazania poprawności działania oraz efektywności procedury wyznaczono charakterystyki dyspersyjne wybranych prowadnic mikrofalowych.