Time filter

Source Type

Wasowicz T.J.,Gdask University of Technology | Kivimaki A.,CNR Institute of Materials | Coreno M.,Gas Phase Beamline Elettra | Coreno M.,CNR Institute of Inorganic Methodologies and Plasmas | Zubek M.,Gdask University of Technology
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2012

The photofragmentation of isoxazole molecules producing excited atomic and molecular fragments has been investigated over the energy range 16-50eV, using photon-induced fluorescence spectroscopy. The following fragments have been identified by their fluorescence: the excited hydrogen atoms H(n), n = 3-7 and the diatomic CH(A 2Δ, B 2Σ -), CN(B 2Σ +) and C 2(d 3Π g) fragments. The diatomic fragments are vibrationally and highly rotationally excited. The fragmentation yield curves for the CH(A 2Δ), CN(B 2Σ +), C 2(d 3Π g) and the H(n), n = 3-7 deduced from their emission yields, were obtained in the photon energy ranges from their appearance energies up to 50eV. It is found that the fragmentation occurs via excitation into higher lying superexcited states of isoxazole. The vertical excitation energies of these states were determined and their possible fragmentation processes are discussed. © 2012 IOP Publishing Ltd.

Konopacka-Yskawa D.,Gdask University of Technology | Lackowski M.,Szewalski Institute of Fluid Flow Machinery
Journal of Crystal Growth | Year: 2011

Calcium carbonate precipitation was investigated in the gasslurry system in the reaction of calcium hydroxide and carbon dioxide. The precipitation process was occurred in the presence of ethylene glycol (EG). The used organic additive changed the viscosity of reactive mixture, the solubility of carbon dioxide and the solubility of calcium carbonate which influence CaCO3 precipitation conditions. The course of reaction was monitored by conductivity probe. The increase concentration of ethylene glycol in the reactive mixture caused higher CO2 usage to achieve the end point of reaction. Calcium carbonate was precipitated as calcite and produced CaCO3 particles formed agglomerates in all experiments. The size of obtained CaCO3 particles decreased when the EG concentration increased from 0% to 15% (by vol.). The further increase of EG concentration in solution up to 20% resulted in an increase of the size of CaCO3 particles. © 2011 Elsevier B.V. All rights reserved.

Yero I.G.,Rovira i Virgili University | Kuziak D.,Gdask University of Technology | Rodriguez-Velazquez J.A.,Rovira i Virgili University
Computers and Mathematics with Applications | Year: 2011

Given a set of vertices S=v1,v2,...,vk of a connected graph G, the metric representation of a vertex v of G with respect to S is the vector r(v|S)=(d(v,v1),d(v,v2),...,d(v, vk)), where d(v,vi), i∈1,...,k denotes the distance between v and vi. S is a resolving set for G if for every pair of distinct vertices u,v of G, r(u|S)≠r(v|S). The metric dimension of G, dim(G), is the minimum cardinality of any resolving set for G. Let G and H be two graphs of order n1 and n2, respectively. The corona product G⊙H is defined as the graph obtained from G and H by taking one copy of G and n1 copies of H and joining by an edge each vertex from the ith-copy of H with the ith-vertex of G. For any integer k<2, we define the graph G⊙kH recursively from G⊙H as G⊙ kH=(G⊙k-1H)⊙H. We give several results on the metric dimension of G⊙kH. For instance, we show that given two connected graphs G and H of order n1<2 and n2<2, respectively, if the diameter of H is at most two, then dim(G⊙ kH)=n1(n2+1)k-1dim(H). Moreover, if n2<7 and the diameter of H is greater than five or H is a cycle graph, then dim(G⊙kH)=n1(n2+1)k-1dim( K1⊙H). © 2011 Elsevier Ltd. All rights reserved.

Inglot A.,Gdask University of Technology | Koziol K.,AGH University of Science and Technology
Proceedings - 2016 Baltic Geodetic Congress (Geomatics), BGC Geomatics 2016 | Year: 2016

In this work, we present two detailed problems of topological errors in spatial database. Both issues are inconsistencies in the database, i.e. interior topological relationships layers of buildings and the relationship between the buildings layer and the layer of plots. That inconsistency is related to the residual polygons that arise as a result of overlapping objects, or gaps between objects. The occurrence of this type of error causes inconsistency in spatial databases. The authors present two algorithms indicating the elements of inconsistencies base. © 2016 IEEE.

Mrotek M.,Gdask University of Technology | Plucilski J.,Gdask University of Technology | Jadrzejewska-Szczerska M.,Gdask University of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

The aim of the study was to develop an automated computer-aided system for analysis of spectrograms obtained from measurements of biological samples performed with a low-coherence Fabry-Pérot interferometer. Information necessary to determine dispersion characteristics of measured materials can be calculated from the positions of the maxima and minima that are present in their spectra. The main challenge faced during the development of the system was reliable detection of these maxima and minima in the presence of noise, without requiring substantial user interaction, and with an acceptable computational complexity. © 2016 SPIE.

Pitek R.J.,Gdask University of Technology | Brudziak P.,Gdask University of Technology | Zalewska-Pitek B.M.,Gdask University of Technology | Wojciechowski M.A.,Gdask University of Technology | And 2 more authors.
BMC Structural Biology | Year: 2011

Background: DraD invasin encoded by the dra operon possesses a classical structure characteristic to fimbrial subunits of the chaperone/usher type. The Ig-fold of the DraD possesses two major characteristics distinguishing it from the family of fimbrial subunits: 1) a distortion of the -barrel structure in the region of the acceptor cleft, demonstrated by a disturbance of the main-chain hydrogen bonds network, and 2) an unusually located disulfide bond connecting B and F strands - the localization exclusively observed in the subfamily of DraD/AfaD-type subunits. Results: To evaluate the influence of the DraD-sc specific structural features on its stability and mechanism of thermal denaturation, a series of DSC and FT-IR denaturation experiments were performed giving following conclusions. 1) The DraD-sc is characterized by a low stability (standard Gibbs free energy and enthalpy of unfolding of 18.4 1.4 kJ mol -1 and 131 25 kJ mol-1, respectively) that contrasts strongly with almost infinite stability of the described previously DraE-sc fimbrial protein. 2) The DraD-sc unfolds thermally according to the two state equilibrium model, in contrast to the irreversible kinetically controlled transition of the DraE-sc. 3) The DraD specific disulfide bond is crucial at the folding stage and has little stability effect in the mature protein. Conclusions: Data published so far emphasize unique biological properties of the DraD invasin as fimbrial subunit: a chaperone independent folding, an usher independent surface localization and the possibility to exist in two forms: as unbound subunits and as loosely bound at fimbrial tip. Presented calorimetric and FT-IR stability data combined with structural correlations has underlined that the DraD invasin is also characterized by unique physicochemical and structural attributes in the context of its belonging to the family of fimbrial subunits. © 2011 Pitek et al; licensee BioMed Central Ltd.

Kulawiak M.,Gdask University of Technology | Lubniewski Z.,Gdask University of Technology
Proceedings - 2016 Baltic Geodetic Congress (Geomatics), BGC Geomatics 2016 | Year: 2016

Unorganised point cloud dataset, as a transitional data model in several applications, usually contains a considerable amount of undesirable irregularities, such as strong variability of local point density, missing data, overlapping points and noise caused by scattering characteristics of the environment. For these reasons, further processing of such data, e.g. for construction of higher order geometric models of the topography or other sensed objects, may be quite problematic, especially in the field of object detection and three-dimensional surface reconstruction. This paper is focused on applying the proposed methods for reducing the mentioned irregularities from several datasets containing 3D point clouds acquired by LiDAR scanners and multibeam sonars. The good performance of the proposed methods has been shown along with illustration of the importance of the appropriate design of the point cloud data preprocessing step in the context of the final results of the 3D shape reconstruction procedure. © 2016 IEEE.

Kowalczuk Z.,Gdask University of Technology | Domalski M.,Gdask University of Technology
International Journal of Systems Science | Year: 2012

In this article, we consider the problem of trajectory estimation of a continuous-time two-dimensional (2D) Gaussian-Markov processes based on noisy measurements executed in non-uniformly distributed time moments. In such a case, a discrete-time prediction has to be performed in each cycle of estimation (by means of a Kalman filter). This task can, however, be computationally expensive. To solve this problem, we derive explicit formulae for predicting the 2D process based on explicit forms of the matrix exponential. The effects of the resulting estimator are confronted with those of the classical Kalman filter. Simulated experiments illustrate the effectiveness of the proposed approach. © 2012 Taylor & Francis.

Dereniowski D.,Gdask University of Technology
Theoretical Computer Science | Year: 2012

The problems of (classical) searching and connected searching of weighted trees are known to be computationally hard. In this work we give a polynomial-time 3-approximation algorithm that finds a connected search strategy of a given weighted tree. This in particular yields constant factor approximation algorithms for the (non-connected) classical searching problems and for the weighted pathwidth problem for this class of graphs. © 2012 Elsevier B.V. All rights reserved.

Graff G.,Gdask University of Technology | Kaczkowska A.,Gdask University of Technology
Acta Physica Polonica A | Year: 2013

Zunino et al. analyzed the problem of discrimination of developed and emergent markets by the use of ordinal patterns methods: number of forbidden patterns and ordinal pattern probability distribution as a basis for entropy and statistical measure of complexity. In this paper we apply the same methodology for the analysis of Polish stock market (index WIG). The results indicate that Polish market belongs neither to developed, nor to emergent groups of markets. It represents hybrid market, the third group distinguished in the paper by Zunino et al.

Loading Gdask University of Technology collaborators
Loading Gdask University of Technology collaborators