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Tytuł:
Constructing a Research Project: What Should We Pay Attention to When Applying Qualitative Methods? Discussion of the Proposals of King, Keohane, Verba
Autorzy:
Kapała, Magdalena
Tematy:
research project
qualitative methods
quantitative methods
Pokaż więcej
Wydawca:
Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
Powiązania:
https://bibliotekanauki.pl/articles/44950966.pdf  Link otwiera się w nowym oknie
Opis:
In this article, I will discuss the position of King, Keohane and Verba. Referring directly to the issues of sociology and political science, these authors set the main goal of their considerations to show how to design a research that brings accurate conclusions about social and political life. Many of their comments are applicable to research in other fields of science, including in psychology. Qualitative, and not only quantitative, methods can be very useful in researching the IT environment. Educational organizations can apply the conclusions from studies which connect the qualitative and quantitative methods to assist in the staff development to achieve organizational goals. Also -in process of proper recruitment of leaders in business management or to assist the stuff to raise the performing of professional tasks, even self-development of stuff members should also use the scientific research findings. Hence I consider both – quantitative but also qualitative methods – worth quoting and analyzing.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for solving the Neumann problem for the Poisson equation on the exterior of a poligon
Autorzy:
Roliński, Tomasz
Tematy:
Boundary element methods
Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods
Pokaż więcej
Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/747369.pdf  Link otwiera się w nowym oknie
Opis:
.
This paper is concerned with a numerical method for solving the problem Δu=f in Ωc (=intR2\Ω), (du/dn)|Γ=g, where ΩR2 is a polygon and Γ is the boundary of Ω. The method is based on coupling finite and boundary element techniques. To compensate for the loss of smoothness of the solution u near the corners of the polygon Ω we refine the triangulation without changing the number of triangles. We apply the affine triangular Lagrangean element of degree kN and the Lagrangean boundary element of degree k−1 to obtain the optimal order of convergence via the Galerkin projection.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing methods for vehicle shock absorbers
Autorzy:
Gardulski, J.
Tematy:
transport
vibroacoustic methods
testing methods
shock absorbers
Pokaż więcej
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Powiązania:
https://bibliotekanauki.pl/articles/244102.pdf  Link otwiera się w nowym oknie
Opis:
The suspension is the component decisive about safety of drive of cars, in which dumping elements have essential meaning, which the most often are telescopic hydraulic shock-absorbers. Therefore, in exploitation process so important investigations of their technical condition are in track which opinion of their usefulness should be made not only to more far exploitation, but also the identification of typical damages. The common used method in practical ways of diagnosing of shock-absorber in article was introduced. There are two methods of investigations: built from and shock-absorber built-in in vehicle suspension. In first method - in support about indicatory graph, the characteristic of suppression be appointive. They are the basis to diagnostic opinion of technical condition of studied damper. In second method the results of investigations have approximate character. From those methods the most often used station control of vehicles in Poland - method post EUSAMA and BOGE in article were described, which used in investigations the harmonic excitatory of vibrations stimulant to vibrations unsprung and sprung masses of vehicle. The car is so folded, vibrate mechanical stimulated by excitator to vibrations arrangement. The vibro-acoustic methods of analyses' of signals in article were introduced, which can be practical in investigations of diagnostic shock-absorber. They are then the method of multidimensional analysis of signal - the Short-Time Fourier Transforms (the STFT), Wigner - Ville'a and Wavelet.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical methods in fluid mechanics – an overview
Autorzy:
Sobieski, Wojciech
Šarler, Božidar
Tematy:
CFD
numerical modelling
mesh methods
meshless methods
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Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Powiązania:
https://bibliotekanauki.pl/articles/22672799.pdf  Link otwiera się w nowym oknie
Opis:
The article presents in a review way the most important numerical methods used in modern fluid mechanics. The individual chapters discuss Finite Difference Method, Finite Volume Method, Lattice Boltzmann Method, Discrete Element Method and Smoothed Particle Hydrodynamics. The aim of the article is to familiarize the reader with the most important concepts, features and mathematical equations used in particular methods. The article is intended mainly for people who want to get acquainted with the current possibilities of numerical modelling in the field of broadly understood fluid mechanics. The material is intended to facilitate the decision on how to implement the planned play research.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tools for estimating fake/non-prompt lepton backgrounds with the ATLAS detector at the LHC
Autorzy:
Richter-Wąs, Elżbieta
Pałka, Marek
Topolnicki, Kacper
Gil, Damian
Współwytwórcy:
Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2930
Opis:
Measurements and searches performed with the ATLAS detector at the CERN LHC often involve signatures with one or more prompt leptons. Such analyses are subject to `fake/non-prompt' lepton backgrounds, where either a hadron or a lepton from a hadron decay or an electron from a photon conversion satisfies the prompt-lepton selection criteria. These backgrounds often arise within a hadronic jet because of particle decays in the showering process, particle misidentification or particle interactions with the detector material. As it is challenging to model these processes with high accuracy in simulation, their estimation typically uses data-driven methods. Three methods for carrying out this estimation are described, along with their implementation in ATLAS and their performance.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Comparison of different types of maximum power point techniques for photovoltaic systems
Autorzy:
Ostrowski, Mariusz
Mroczka, Janusz
Płachta, Kamil
Tematy:
maximum power point
partial shading conditions
comparison of MPPT methods
direct MPPT methods
indirect MPPT methods
hybrid MPPT methods
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/58973815.pdf  Link otwiera się w nowym oknie
Opis:
In this paper a comparison of different types of maximum power point search methods for the photovoltaic panels is presented. The methods that represent each group of maximum power point techniques will be implemented in the software that allows to test the behaviour of photovoltaic panels in different environment conditions including partial shading. In this paper each implemented method was compared including time of convergence with the maximum power point, tracking error and differences in the energy obtained from photovoltaics during the simulation time. The algorithms were compared under both uniform lighting and partial shade conditions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of MUSCL-Hancock method into the C++ code for the Euler equations
Autorzy:
Murawski, K.
Stpiczyński, P.
Tematy:
hyperbolic equations
numerical methods
Godunow methods
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/200996.pdf  Link otwiera się w nowym oknie
Opis:
In this paper we present implementation of the MUSCL-Hancock method for numerical solutions of the Euler equations. As a result of the internal complexity of these equations solving them numerically is a formidable task. With the use of the original C++ code, we developed and presented results of a numerical test that was performed. This test shows that our code copes very well with this task.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systematyka metod oceny jakości działalności marketingowej organizacji
Systematics of quality assessment methods for business marketing organizations
Autorzy:
Szyran-Resiak, Agata
Tematy:
systematics
methods of assessing the quality of an organization's marketing activities
qualitative methods
quantitative methods
qualitative and quantitative methods (mixed)
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Wydawca:
Mazowiecka Uczelnia Publiczna w Płocku
Powiązania:
https://bibliotekanauki.pl/articles/447025.pdf  Link otwiera się w nowym oknie
Opis:
This study presents detailed systematics of quality assessment methods for marketing organizations diving it into three groups: qualitative, quantitative and qualitative-quantitative (mixed) methods. The first group includes methods such as: marketing audit, marketing excellence evaluation and review oftheethical and social responsibility of the organization. The second group is: sales analysis, market share analysis, impact analysis with marketing expenditures on sales area, financial analysis, profitability and efficiency control, marketing effectiveness ranking and observation on customer satisfaction. The last group includes methods: balanced scorecard and marketing benchmark. Approach towards assessing the quality of organization's marketing activities requires using one particular method. Due to big number of existing methods for assessing the quality of marketing activities, a question arises: which one will allow us fully assess the activity.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polydiagnostics performed on high - tech plasmas
Autorzy:
van der Mullen, J. J. A. M.
Palomares, J. M.
Iordanova, E.
Hübner, S.
Carbone, E. A. D.
Tematy:
polydiagnostics
high-tech plasmas
passive methods
active methods
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/147834.pdf  Link otwiera się w nowym oknie
Opis:
The large effluxes generated by high-tech plasmas force plasmas to non-equilibrium conditions. This implies that plasma features are decoupled from each other and that therefore different methods have to be used quasi-simultaneously to characterize the plasma. Even more insight in plasmas and methods is obtained if polydiagnostics is applied to a series of plasma conditions that gradually differ in equilibrium departure. After discussing methods of passive and active spectroscopy, we apply polydiagnostics on an argon plasma operated in open air. By introducing H2 and reducing the power we approach conditions of cool atmospheric plasmas (CAPs). It is seen that especially the passive methods for the electron temperature determination are very sensitive to the degree of equilibrium departure suggesting that active spectroscopy is preferable. However, one should realize that lasers can easily heat cool plasmas. This is due to the fact that the ionization degree of (semi-) CAPs is small.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Fermi gamma-ray burst duration distribution
Autorzy:
Tarnopolski, Mariusz
Opis:
Context. Two classes of gamma-ray bursts (GRBs), short and long, have been determined without any doubts, and are usually prescribed to different physical scenarios. A third class, intermediate in T_{90} durations has been reported in the datasets of BATSE, Swift, RHESSI, and possibly BeppoSAX. The latest release of >1500 GRBs observed by Fermi gives an opportunity to further investigate the duration distribution. Aims. The aim of this paper is to investigate whether a third class is present in the log T_{90} distribution, or whether it is described by a bimodal distribution. Methods. A standard x^{2} fitting of a mixture of Gaussians was applied to 25 histograms with different binnings. Results. Different binnings give various values of the fitting parameters, as well as the shape of the fitted curve. Among five statistically significant fits, none is trimodal. Conclusions. Locations of the Gaussian components are in agreement with previous works. However, a trimodal distribution, understood in the sense of having three distinct peaks, is not found for any binning. It is concluded that the duration distribution in the Fermi data is well described by a mixture of three log-normal distributions, but it is intrinsically bimodal, hence no third class is present in the T_{90} data of Fermi. It is suggested that the log-normal fit may not be an adequate model.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Epidemics spread in heterogeneous populations
Autorzy:
Capała, Karol
Dybiec, Bartłomiej
Opis:
Individuals building populations are subject to variability. This variability affects progress of epidemic outbreaks, because individuals tend to be more or less resistant. Individuals also differ with respect to their recovery rate. Here, properties of the SIR model in inhomogeneous populations are studied. It is shown that a small change in model’s parameters, e.g. recovery or infection rate, can substantially change properties of final states which is especially well-visible in distributions of the epidemic size. In addition to the epidemic size and radii distributions, the paper explores first passage time properties of epidemic outbreaks.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Methods of Training of Programming for Future Information Science Teachers via Distance Learning
Autorzy:
Onishchenko, Sergey
Wydawca:
Studio NOA for University of Silesia in Katowice
Cytata wydawnicza:
Sergey Onishchenko, 2013: Methods of Training of Programming for Future Information Science Teachers via Distance Learning, [in] E-learning & Lifelong Learning. Monograph. Sc. Editor Eugenia Smyrnova-Trybulska, Studio Noa for University of Silesia in Katowice, Katowice-Cieszyn, pp. 537-544. ISBN 978-83-60071-66-3
Opis:
The article describes the main classifications of learning methods from the viewpoint of their application in distance learning of programming. From there, the following classifications are considered: classification by the methods of training material presenting, classification by the main types of didactic problems, and classification by the kinds of cognitive activity of students. Also, the article characterizes the level of skills and ability needed to solve programming training tasks: reproductive, meaningful, probative, and creative programming. The following didactic particularities of approaches to learning of programming are defined: focusing on material covering, algorithms, and on hardware.
Dostawca treści:
Repozytorium Centrum Otwartej Nauki
Artykuł
Tytuł:
The assessment of the impact of myofascial training on postural control – a case study
Autorzy:
Guzik, Agnieszka
Chwaszcz, Bartłomiej
Drużbicki, Mariusz
Wolan-Nieroda, Andżelina
Wyszyńska, Justyna
Tematy:
balance
eccentric muscle work
qualitative methods
stretching
quantitative methods
Pokaż więcej
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Powiązania:
https://bibliotekanauki.pl/articles/454773.pdf  Link otwiera się w nowym oknie
Opis:
Introduction. A sedentary lifestyle with lack of physical activity contributes to deteriorated balance among healthy young people. Physical activity is import_ant since it stimulates neuromuscular junctions that control body posture, especially at younger age, when greater postural sway may be observed in stabilography compared to adults. Proper work of individual muscle groups is import_ant to maintain proper balance. Abnormal muscle tone can lead to dysbalances that make it difficult o maintain a stable posture in a variety of conditions. Aim. The aim of the study was to evaluate the effect of a training cycle consisting of stretching of the ilopsoas, rectus femoris, gluteus maximus, hamstring and rectus abdominis, and eccentric training of the above mentioned muscles to improve static and dynamic balance. Methods. Oobjective and qualitative-subjective were used to assess the results in a man aged 22 yrs. Postural control was tested twice in the patient with the Neurocom International Inc. SMART EquiTest device under static conditions without visual control and with dynamic visual surrounding and unstable support surface. Automatic postural reflexes were also evaluated. In addition, clinical tests were performed. Results. Myo-fascial training, which included eccentric training combined with lower limb and trunk stretching improved the postural control in the subject.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of projection and penalty methods for discretized elliptic control problems
Autorzy:
Cegielski, Andrzej
Grossmann, Christian
Tematy:
convex programming
control of PDE
projection methods
penalty methods
Pokaż więcej
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Powiązania:
https://bibliotekanauki.pl/articles/729435.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, properties of projection and penalty methods are studied in connection with control problems and their discretizations. In particular, the convergence of an interior-exterior penalty method applied to simple state constraints as well as the contraction behavior of projection mappings are analyzed. In this study, the focus is on the application of these methods to discretized control problem.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing the randomness of lithostratigraphic successions with the Markov Chain methods
Autorzy:
Doktor, M.
Krawczyk, A.
Mastej, W.
Tematy:
Markov chain methods
Monte Carlo methods
coal-bearing successions
Pokaż więcej
Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191918.pdf  Link otwiera się w nowym oknie
Opis:
The crucial role in the studies on layer successions in lithostratigraphic sections with the application of stochastic model of depositional processes represented by the Markov chain is played by correct estimation of the matrix of transition numbers between lithofacies expected in a random sequence. Methods known from the literature are iteration procedures, which do not ensure quick, general solution. Hence, we propose a universal method based upon the Monte Carlo simulation technique. This method enables the researcher to estimate precisely and reliably the expected matrix of facies transitions.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alternating direction Galerkin method for quasilinear parabolic equations
Autorzy:
Dryja, M.
Tematy:
Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods
Pokaż więcej
Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/748658.pdf  Link otwiera się w nowym oknie
Opis:
MR0549983
Consider the following parabolic equation: (1) ∂u/∂t−∑2i=1(d/dxi)ai(x,t,u,D1u,D2u)+a0(x,t,u,D1u,D2u)=f(x,t), x=(x1,x2)∈Ω⊂R2, t∈[0,T], with the initial value condition u(x,0)=u0(x), x∈Ω, and with the boundary value condition u(x,t)=0, x∈∂Ω, t∈[0,T]. For the solution of equation (1) the author proposes a variational-difference method. Namely, he approximates equation (1) by Galerkin's method with respect to the variables x1,x2 and by the finite-difference method with respect to the variable t. Under some assumptions concerning the coefficients ai, i=0,1,2, an estimate of the error is given.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconvergence in the finite element method
Autorzy:
Leyk, Zbigniew
Tematy:
Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods
Pokaż więcej
Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/748740.pdf  Link otwiera się w nowym oknie
Opis:
MR0707821
For some variants of the finite element method there exist points having a remainder value or a derivation remainder remarkably less than those given by global norms. This phenomenon is called superconvergence and the points are called superconvergence points. The generalized problem corresponding to (1) is as follows: Let Hk(Ω) be Sobolev space and Hk0(Ω) the completion of the space C∞0(Ω) with norm ∥⋅∥k,Ω. Find u∈H10(Ω) such that for each v∈H10(Ω), (2) a(u,v)=(f,v)0 holds, where a(u,v)=∫Ω(∑n|α|=0aα(x)DαuDαv)dx, (f,v)0=∫Ωf(x)v(x)dx, Dα=Dα11⋯Dαnn,1.5pt Dαiiu=∂αiu/∂xαii, i=1,n¯¯¯¯¯¯¯¯. The approximate problem of the finite element variant considered is the following: Find uh∈Vh such that (3) for all v∈Vh, a(uh,v)=(f,v)0. The main result is the theorem: Let ai∈C(Ω¯), D1ai,D2ai∈L∞(Ω),i=1,2,∥σ∥∞L(Ω)≤σ,f∈L2(Ω). Suppose the eigenvalues of the operator L are different from zero, and u∈H4(Ω)∩H10(Ω). Then there exists h0 such that for h≤h0, h2∑P∈G|grad(u−uh)(P)|≤Ch3(|u|3+|u|4), where u and uh are the solutions of problems (2) and (3), respectively, and C is some constant independent of h. Further, |u|k={∫Ω(∑|α|=k(Dαu)2)dx}1/2, G=⋃N1N2i=1Fi(R), R={(±3√/3,±3√/3)} is a Gauss point set in the quadrant S={(ξ1,ξ2):|ξk|≤1,k=1,2}, and Fi(F(1)i,F(2)i):S→ei, ei an element; F(1)i(ξ1,ξ2)=x(i)0+h1ξ1/2, F(2)i(ξ1,ξ2)=y(i)0+h2ξ2/2, and (x(i)0,y(i)0) is the middle element.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the observed and intrinsic durations of Swift/BAT gamma-ray bursts
Autorzy:
Tarnopolski, Mariusz
Opis:
The duration distribution of 947 GRBs observed by Swift/BAT, as well as its subsample of 347 events with measured redshift, allowing to examine the durations in both the observer and rest frames, are examined. Using a maximum log-likelihood method, mixtures of two and three standard Gaussians are fitted to each sample, and the adequate model is chosen based on the value of the difference in the log-likelihoods, Akaike information criterion and Bayesian information criterion. It is found that a two-Gaussian is a better description than a three-Gaussian, and that the presumed intermediate-duration class is unlikely to be present in the Swift duration data.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
On the limit between short and long GRBs
Autorzy:
Tarnopolski, Mariusz
Opis:
Two classes of GRBs have been identified thus far without doubt and are prescribed to different physical scenarios—NS-NS or NS-BH mergers, and collapse of massive stars, for short and long GRBs, respectively. The existence of two distinct populations was inferred through a bimodal distribution of the observed durations $T_{90}$, and the commonly applied 2 s limit between short and long GRBs was obtained by fitting a parabola between the two peaks in binned data from BATSE 1B. Herein, by means of a maximum likelihood (ML) method a mixture of two Gaussians is fitted to the datasets from BATSE, Swift, BeppoSAX, and Fermi in search for a local minimum that might serve as a new, more proper, limit for the two GRB classes. It is found that Swift and BeppoSAX distributions are unimodal, hence no local minimum is present, Fermi is consistent with the conventional limit, whereas BATSE gives the limit significantly longer (equal to 3.38 $\pm$ 0.27 s) than 2 s. These new values change the fractions of short and long GRBs in the samples examined, and imply that the observed $T_{90}$ durations are detector dependent, hence no universal limiting value may be applied to all satellites due to their different instrument specifications. Because of this, and due to the strong overlap of the two-Gaussian components, the straightforward association of short GRBs to mergers and long ones to collapsars is ambiguous.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Najnowsze metody nieniszczące wykorzystywane w badaniach w budownictwie
The latest non-destructive methods used in research in construction
Autorzy:
Schabowicz, K.
Tematy:
obiekty budowlane
diagnostyka
metody badawcze
metody nieniszczące
civil structures
diagnostics
test methods
nondestructive methods
seminondestructive methods
Pokaż więcej
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:
https://bibliotekanauki.pl/articles/107874.pdf  Link otwiera się w nowym oknie
Opis:
W artykule przedstawiono najnowsze metody nieniszczące wykorzystywane w badaniach w budownictwie. Zamieszczono przegląd i opis wybranych metod. Pokazano przede wszystkim przydatne do tego celu najnowsze metody nieniszczące. Można zaobserwować, iż rozwój metod badawczych jest ukierunkowany na ocenę w elementach i konstrukcjach innych cech niż wytrzymałość. Następuje on w kierunku konstruowania aparatury badawczej pozwalającej uzyskiwać precyzyjne dane odnośnie do struktury badanego elementu zarówno w skali makro, jak i mikro, a czasem i nano. Daje to możliwość pełniejszej oceny jakości wykonania poszczególnych elementów w obiekcie budowlanym i jego konstrukcji.
This paper presents the latest non-destructive methods used in research in construction. The classification of the methods are included. The most interesting of the methods are described. A focus is on the latest nondestructive. Today the development of test methods is oriented towards the evaluation of the characteristics of structures and structural components other than strength. The development of equipment enabling one to obtain an accurate image of the inside structure of the tested element in macro, micro and nano scale. An extensive survey of the literature on the subject, which researchers and experts in the diagnostics of civil structures may find useful, is included.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual graphic solutions and their place in classification of cartographic presentation methods
Autorzy:
Korycka-Skorupa, Jolanta
Kacprzyk, Izabela
Miłaszewska, Małgorzata
Tematy:
visualisation
cartographic presentation methods
ordinal methods
choropleth map
Pokaż więcej
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Powiązania:
https://bibliotekanauki.pl/articles/2030311.pdf  Link otwiera się w nowym oknie
Opis:
Examples of unusual and unconventional graphic solutions which we can often find in the times of fast developing computer technology are discussed in the article. Many of them are suggested by various GIS programs, few of them may be found in the press or on the Internet. This means that their users are people who are not associated with cartography and who are not familiar with the framework of cartographic methods.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The National Security Culture and the Power of the State. A Scientific Study
Autorzy:
Piwowarski, Juliusz
Tematy:
Security
culture
power
state
qualitative methods
quantitative methods
Pokaż więcej
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Powiązania:
https://bibliotekanauki.pl/articles/1832118.pdf  Link otwiera się w nowym oknie
Opis:
Article presents the form and perspectives for scientific research provided in the area of measurement of the power of state. Author sees the power of state as a part of security culture concept. Several ways of analysing and scientific research methods are presented, with their advantages and disadvantages, stressing both qualitative and quantitative factors. The theoretical basis is also included, with presentation of many different approaches.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distinguishing short and long Fermi gamma-ray bursts
Autorzy:
Tarnopolski, Mariusz
Opis:
Two classes of gamma-ray bursts (GRBs), short and long, have been determined without any doubts, and are usually ascribed to different progenitors, yet these classes overlap for a variety of descriptive parameters. A subsample of 46 long and 22 short Fermi GRBs with estimated Hurst Exponents (HEs), complemented by minimum variability time-scales (MVTS) and durations (T_{90}) is used to perform a supervised machine learning and Monte Carlo simulation using a support vector machine algorithm. It is found that while T_{90} itself performs very well in distinguishing short and long GRBs, the overall success ratio is higher when the training set is complemented by MVTS and HE. These results may allow us to introduce a new (non-linear) parameter that might provide less ambiguous classification of GRBs.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Analysis of gamma-ray burst duration distribution using mixtures of skewed distributions
Autorzy:
Tarnopolski, Mariusz
Opis:
Two classes of GRBs have been confidently identified thus far and are prescribed to different physical scenarios – NS-NS or NS-BH mergers, and collapse of massive stars, for short and long GRBs, respectively. A third, intermediate in duration class, was suggested to be present in previous catalogs, such as BATSE and Swift, based on statistical tests regarding a mixture of two or three log-normal distributions of T_{90}. However, this might possibly not be an adequate model. This paper investigates whether the distributions of log T_{90} from BATSE, Swift, and Fermi are described better by a mixture of skewed distributions rather than standard Gaussians. Mixtures of standard normal, skew-normal, sinh-arcsinh and alpha-skew-normal distributions are fitted using a maximum likelihood method. The preferred model is chosen based on the Akaike information criterion. It is found that mixtures of two skew-normal or two sinh-arcsinh distributions are more likely to describe the observed duration distribution of Fermi than a mixture of three standard Gaussians, and that mixtures of two sinh-arcsinh or two skew-normal distributions are models competing with the conventional three-Gaussian in the case of BATSE and Swift. Based on statistical reasoning, and it is shown that other phenomenological models may describe the observed Fermi, BATSE, and Swift duration distributions at least as well as a mixture of standard normal distributions, and the existence of a third (intermediate) class of GRBs in Fermi data is rejected.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Methods Used in Undergraduate Study Programmes for Tourism and Sustainability at the University of Latvia
Autorzy:
Bērziņa, Kristīne
Ilze, Medne
Tematy:
tourism
tourism education
sustainability
quantitative research methods
qualitative research methods
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Wydawca:
Wyższa Szkoła Bankowa w Poznaniu
Powiązania:
https://bibliotekanauki.pl/articles/1390623.pdf  Link otwiera się w nowym oknie
Opis:
Globalisation in education sector, intense competition between universities in Latvia, increase in requirements of applied teaching from private companies, growing exactingness from students – it all makes base to improve University curricula using different active teaching techniques for better knowledge capture. In the case study of University of Latvia tourism study programme authors included practice of active teaching method application used to improve student understanding and competences including research, surveys, observations, shadowing, monitoring and register of the tourist tracks, expert interviews and industry seminars, discussions and interviews with industry stakeholders, field trips, different tourism sector enterprise and organisation visits inspections, colloquiums, research result presentations in seminars and conferences, knowledge enhancing for sustainability, best practices and systems used by other countries. Many of active learning methods are as additional activities for students not included in the compulsory part of studies, therefore it is needed to establish an additional separate entity for tourism and sustainability activities for applied teaching and research at university – Tourism and Sustainability Research Laboratory. Separate research entity gives possibility to involve interested students from different study programmes and cooperation with other faculties.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximation methods for a class of discrete Wiener-Hopf equations
Autorzy:
Nowak, M. A.
Tematy:
projection methods
iterative methods
discrete Wiener-Hopf equations
Toeplitz operators
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/255249.pdf  Link otwiera się w nowym oknie
Opis:
In this paper, we consider approximation methods for operator equations of the form Au + Bu = ƒ, where A is a discrete Wiener-Hopf operator on lp (1≤ p < ∞) which symbol has roots on the unit circle with arbitrary multiplicities (not necessary integers). Conditions on perturbation B and ƒ are given in order to guarantee the applicability of projection-iterative methods. Effective error estimates, and simultaneously, decaying properties for solutions are obtained in terms of some smooth spaces.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie metod symulacji komputerowej w badaniach hałasu przemysłowego
The use of computer simulation methods in industrial noise research
Autorzy:
Kuboszek, A.
Tematy:
hałas
metody symulacyjne
metody geometryczne
noise
simulation methods
geometric methods
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Wydawca:
STE GROUP
Powiązania:
https://bibliotekanauki.pl/articles/112730.pdf  Link otwiera się w nowym oknie
Opis:
W artykule przedstawiono przykłady wykorzystania komputerowych metod symulacji zjawisk akustycznych w pracach projektowych zmierzających do opracowania optymalnych sposobów ograniczenia hałasu na stanowisku pracy. Zastosowanie symulacji komputerowej daje możliwość opracowania strategii prac wyciszeniowych najkorzystniejszej pod kątem skuteczności akustycznej oraz opłacalności ekonomicznej.
This paper presents examples of using computer-based methods of acoustic simulation for optimal designing of noise reduction projects at the workplaces. Using of the acoustic simulations provides the opportunity to develop optimal strategies for noise reduction in terms of acoustic efficiency and cost-effectiveness.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal control problem for Roesser systems
Autorzy:
Biły, Barbara
Tematy:
Methods of nonlinear programming type
Computational methods
Discrete-time systems
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/747892.pdf  Link otwiera się w nowym oknie
Opis:
.
The quadratic performance index in a fixed rectangle for the Roesser model of two-dimensional, linear, stationary, discrete systems is considered. Using a method of transformation for the System and the performance index, the problem of finding the optimal sequence of control vectors is solved by a method of mathematical programming. The simple numerical example illustrates the presented method.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of patch substructuring methods
Autorzy:
Gander, M. J.
Halpern, L.
Magoules, F.
Roux, F. X.
Tematy:
metoda rozkładu
metoda dopełniacza Schura
zoptymalizowana metoda Schwarza
Schwarz domain decomposition methods
Schur complement methods
patch substructuring methods
optimized Schwarz methods
Pokaż więcej
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:
https://bibliotekanauki.pl/articles/929707.pdf  Link otwiera się w nowym oknie
Opis:
Patch substructuring methods are non-overlapping domain decomposition methods like classical substructuring methods, but they use information from geometric patches reaching into neighboring subdomains, condensated on the interfaces, to enhance the performance of the method, while keeping it non-overlapping. These methods are very convenient to use in practice, but their convergence properties have not been studied yet. We analyze geometric patch substructuring methods for the special case of one patch per interface. We show that this method is equivalent to an overlapping Schwarz method using Neumann transmission conditions. This equivalence is obtained by first studying a new, algebraic patch method, which is equivalent to the classical Schwarz method with Dirichlet transmission conditions and an overlap corresponding to the size of the patches. Our results motivate a new method, the Robin patch method, which is a linear combination of the algebraic and the geometric one, and can be interpreted as an optimized Schwarz method with Robin transmission conditions. This new method has a significantly faster convergence rate than both the algebraic and the geometric one. We complement our results by numerical experiments.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on the scheme of simple sampling with replacement
Autorzy:
Wagner, Wiesław
Mantaj, Andrzej
Tematy:
reoresentative methods
replacement
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Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Powiązania:
https://bibliotekanauki.pl/articles/658405.pdf  Link otwiera się w nowym oknie
Opis:
Wyróżnia się losowanie proste bez zwracania (lpbz) oraz ze zwracaniem (lpzz). Oba schematy określa się jako indywidualne losowania nieograniczone zależne i niezależne. Schemat lpzz ze skończonej populacji generalnej zawierającej N jednostek jest stosowany w sytuacjach, gdy dopuszcza się możliwość wielokrotnego występowania tych samych jednostek w wylosowanej próbie. Ma to miejsce wtedy, gdy pobieranie jednostek odbywa się przy niezmiennym jej składzie, czyli prawdopodobieństwo wyboru każdej jednostki z populacji generalnej jest stałe i pozostaje jednakowe w całym procesie losowania próby. W pracy przedstawiono ogólny model matematyczny schematu losowania ze zwracaniem, wzory na liczbę prób wyrażoną wariacją z powtórzeniami, podano prawdopodobieństwo wyloso- wania prób z zadanym elementem oraz wyprowadzono różnymi sposobami wzór na prawdopodobieństwo przynależności rzędu drugiego zadanej pary jednostek. Niektóre wzory zilustrowano przykładami.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic and logistic research methods
Autorzy:
Kowalczyk, Anna
Tematy:
methods
researches
science
Pokaż więcej
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/1181234.pdf  Link otwiera się w nowym oknie
Opis:
In this papers the methods for economic researches used in i.e. logistics are presented. The concern of economic researches is important for scientists and for businessmen. The knowledge of methods and theirs skilful application enables the optimization of management and of cognitive processes.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-hospital methods of oxygen therapy and airway management in patients with suspected or confirmed COVID-19
Przedszpitalne metody tlenoterapii i udrożnienia dróg oddechowych u pacjentów z podejrzeniem lub potwierdzonym COVID-19
Autorzy:
Kmieciak, Andrzej
Kubiak, Kamil
Kotliński, Krzysztof
Tematy:
airway patency methods
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Wydawca:
Towarzystwo Pomocy Doraźnej
Powiązania:
https://bibliotekanauki.pl/articles/1033275.pdf  Link otwiera się w nowym oknie
Opis:
There are many treatment suggestions for patients infected with SARS-CoV-2 virus during the coronavirus epidemic. The most common patterns of practice, which are publicly available on social media and medical portals, mainly concern mechanical ventilation methods, but these are examples used in intensive care units. After a retrospective analysis of most recommendations, good practices, guidelines, and primarily based on our experience, the authors of this article prepared a short compendium on safe oxygen therapy in patients suspected or confirmed with the SARS-CoV-2 virus and safe methods of instrumental airway management, minimizing production aerosol. The methods of conducting passive oxygen therapy, controlling breathing, clear upper airway with use of supraglottic devices and modified endotracheal intubation will allow medical personnel to increase their safety in supplying airway management in patients with suspected or confirmed COVID-19. This is extremely important in times of epidemic, where medical personnel in prehospital care is at high risk of being infected with SARS-CoV-2 virus.
Istnieje wiele sugestii dotyczących leczenia pacjentów zakażonych wirusem SARS-CoV-2 podczas epidemii. Najczęstsze praktyczne wzorce, które są publicznie dostępne w mediach społecznościowych i portalach medycznych, dotyczą głównie metod wentylacji mechanicznej, ale są to przykłady stosowane na oddziałach intensywnej terapii. Po retrospektywnej analizie rekomendacji, dobrych praktyk, wytycznych i przede wszystkim w oparciu o własne doświadczenie, autorzy przygotowali krótkie kompendium na temat bezpiecznej terapii tlenowej u pacjentów podejrzanych lub z potwierdzonym zakażeniem wirusem SARS-CoV-2 oraz bezpiecznych metod przyrządowego udrożniania dróg oddechowych, minimalizujących produkcję aerozolu. Metody prowadzenia pasywnej terapii tlenowej, kontrolowanie oddychania, oczyszczanie górnych dróg oddechowych za pomocą przyrządu nadgłośniowego i zmodyfikowana intubacja dotchawiczna pozwolą personelowi medycznemu zwiększyć bezpieczeństwo podczas zabezpieczenia dróg oddechowych u pacjentów z podejrzeniem lub potwierdzonym COVID-19. Jest to niezwykle ważne w czasach epidemii, w której personel medyczny w opiece przedszpitalnej jest narażony na duże ryzyko zarażenia wirusem SARS-CoV-2.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On asymptotic expansions of global errors
Autorzy:
Pfeifer, Eckhard
Tematy:
Finite difference methods
Pokaż więcej
Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/747786.pdf  Link otwiera się w nowym oknie
Opis:
.
We consider a linear partial differential equation with constant coefficients and the corresponding difference equation. Conditions are given under which the error possesses an asymptotic expansion with respect to h. These results are applied to obtain asymptotic expansions of some quadratures and of the approximate solution of a boundary value problem for a second order differential equation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New developments in JAstroCam : software for astronomical data gathering
Autorzy:
Zoła, Stanisław
Budyn, Marek
Opis:
We present a software application called JAstroCam. It is a Java-based software package being developed in cooperation of the Astronomical Observatory of the Jagiellonian University and the Mt. Suhora Observatory of the Pedagogical University, and covers all aspects of image acquisition, including hardware control, environment monitoring and provides support for an observer in gathering high quality scientific data. The main motivation for making yet another software application is lack of advanced tools for data acquisition with CCDs available on the Linux platform. Most of the hardware vendors provide software drivers and supporting applications mainly for the Windows operating system, leaving Linux users with a limited number of open source solutions, usually not optimized for professional astronomers. With cooperation of academic researchers, we have managed to implement an application with an intuitive user interface and powerful tools that perform scheduled image acquisition and crude online data analysis, including measurements of a single frame statistical parameters as well as single and multifilter photometry. We present existing features, latest enhancements built in version 3.X as well future development plans for version 4 of JAstroCam.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
The optimal explicit unconditionally stable box scheme
Autorzy:
Moszyński, Krzysztof
Tematy:
Finite difference methods
Stability and convergence of numerical methods
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/747543.pdf  Link otwiera się w nowym oknie
Opis:
.
The finite difference “box” scheme, (see also [1],[2]), is considered on the simplest possible model of single first order linear hyperbolic equation: ut+mux=0 with constant, coefficient m, and one space variable. The optimal version of the scheme, which is nonoscilating and unconditionally stable with respect to the initial and boundary conditions, is derived in the class of box schemes of the order at, least one. If apropriately iterated, this ścinane may be applied to general systems of quasilinear first order hyperbolic equations in one space variable, as an explicit, unconditionally stable solver. For more than one space variable this solver is applicable via splitting (see [3]).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Difference method for a nonlinear parabolic equation of second order in two space variables
Autorzy:
Kawecki, Roman
Tematy:
Finite difference methods
Stability and convergence of numerical methods
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/747916.pdf  Link otwiera się w nowym oknie
Opis:
.
A.C. Reynolds in his paper (1972) proposed a difference parametric method for solving the Fourier problem for a nonlinear parabolic equation of second order in one space variable. The paper presents a generalization of Reynolds’ method for the problem in two space variables with mixed derivatives. In this paper, Fourier problems for a general class of nonlinear parabolic equation, in QT = Q x [0, T], are studied. To solve this problem we construct a finite difference scheme with a real parameter. We prove that the solutions of certain associated finite difference equations are unique and converge to the solution of the initial-boundary value problem with 0(h^2) rate of convergence.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of controller synthesis using linear matrix inequalities and model predictive control
Autorzy:
Miller, A.
Rybczak, M.
Tematy:
controller synthesis
LMI
MPC
predictive controller
controller synthesis methods
optimization methods
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Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:
https://bibliotekanauki.pl/articles/135474.pdf  Link otwiera się w nowym oknie
Opis:
Controllers based on linear matrix inequalities (LMI) and model predictive control (MPC) both use optimization methods; there are however significant differences between them. In case of LMI controllers, optimization is carried out during controller synthesis, because LMI’s are an optimization tool that requires a linear programming problem being solved. With MPC controllers, however, optimization methods are not used as much in controller synthesis as in controller algorithm operation, to determine optimal control signal values based on the found minimum of the criteria function. A square function is used with boundaries from above and below, which requires a square programming problem, with boundaries for decision variables, being solved. In this paper controller synthesis methods using LMI and MPC are shown, with a focus on the steps that need to be performed, and a comparison of both methods.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method for Reserve Determination of Static and Dynamic List of Bulk Carriers Applied to the Dynamic Under Keel Clearance System in the Port of Świnoujście
Autorzy:
Drwięga, K.
Gucma, L.
Gralak, R.
Tematy:
bulk carrier
dynamic UKC
simulation methods
analytical methods
heel
pressure transmitters
Pokaż więcej
Wydawca:
Polskie Forum Nawigacyjne
Powiązania:
https://bibliotekanauki.pl/articles/1203872.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents the methodology for determining the components which are related to heel of bulk carrier with one component excluded - the heel of vessel due to waves. The described method was applied to the system, which is dedicated to use in determination of UKC of vessels at the approach to the Port of Swinoujscie. The method includes determination of heel caused by: draught reading errors, wind, current, tugboats and heel related to vessel maneuvers. To determine heel related to vessel maneuver 2-stage method was carried out. The first stage simulation was used to identify the parameters of ship movement. At the second stage, the maximum heel of Bulk Carrier were calculated by using analytical methods. Presented method was implemented to the item rating under keel clearance at the approach to the Port of Swinoujscie.
W artykule przedstawiono metodykę określania składników związanych z przechyłem Capesize masowca, nie uwzględniając przechyłu od falowania. W metodzie zawarto określenie składowych przechyłu od błędów odczytu zanurzenia jednostki, działania wiatru, prądu, holowników oraz przechyłu związanego z manewrami jednostki. Ostatnia składowa została określona za pomocą metody dwuetapowej. Na etapie pierwszym za pomocą metod symulacyjnych określono parametry ruchu jednostki. Następnie z użyciem metod analitycznych określono maksymalne przechyły masowca. Przedstawioną metodę zaimplementowano do systemu oceny zapasu wody pod stępką na akwenie podejściowym do Portu w Świnoujściu.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy characteristics of asynchronous electric drive
Autorzy:
German-Galkin, Sergiej
Sakharov, Vladimir
Tarnapowicz, Dariusz
Tematy:
energy characteristics
asynchronous electric drive
scalar control methods
vector control methods
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Wydawca:
STE GROUP
Powiązania:
https://bibliotekanauki.pl/articles/409690.pdf  Link otwiera się w nowym oknie
Opis:
Energy aspects are fundamental to the design of electric drive systems. This article describes energy performance for asynchronous electric drives based on various control methods. These electric drives comparison shows that vector control methods have a significant advantage over scalar control methods. The asynchronous electric drive mathematical description is based on vector control theory and main component method. Equations, obtained by mathematical description, allow calculating of the currents, voltages and electric power at the output when the electromagnetic torque and speed machine are set. Energy characteristics of the asynchronous drive were obtained with the use of the MATLAB-SIMULINK simulation program.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The projective-Newton methods
Autorzy:
Hobot, Grażyna
Pokora, Teresa
Tematy:
Finite elements, Rayleigh-Ritz and Galerkin methods, finite methods
Single equations
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/748356.pdf  Link otwiera się w nowym oknie
Opis:
.
In this paper we consider the Newton-like methods for the solution of nonlinear equations. In each step of the Newton method the linear equations are solved approximatively by a projection method. We call this a projective-Newton method. We investigate the convergence and the order of convergence for these methods. Next, the projective-Newton methods in the finite element space are applied for nonlinear elliptic boundary value problems. In this case the linear equations of the Newton method are solved by the Ritz method.
Dostawca treści:
Biblioteka Nauki
Artykuł
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