662 research outputs found
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No full textPoznańSymbolic sequence decomposition into a set of consecutive, distinct subsequences (mers) is presented. Several statistical distributions of nucleotide subsequences are defined and analysed. Sequence entropy and similarity between sequences in terms of mer lengths distribution are defined. An alignment-free method of phylogenetic tree construction is proposed
Report on the comparison of Tesseract and ABBYY FineReader OCR engines
Get PDFPoznańThe aim of this report is to compare OCR accuracy of two well known OCR engines: Tesseract 3.0.1 and FineReader10 Corporate Edition. The comparison is based on Polish historical printed documents and ground-truth produced within the scope of the IMPACT project
Volume 19 (1) 2013
Get PDFPoznańMonte Carlo simulations of the fcc phase of polydisperse hard spheres near close packing are reported. An experimental equation of state (EoS) is determined numerically in the NpT ensemble with variable shape of the periodic box. The close packing volume extrapolated from the obtained data shows a good agreement with earlier experiments performed by other methods. A new theoretical EoS, based on the free volume approximation, is proposed. The modified EoS fits experimental data for polydisperse hard spheres better than the approximation used before
Introduction to digitisation
Get PDFIn this session we will show some examples of digitisation projects to illustrate what benefits are associated with digitisation. We will discuss what can be a subject of digitisation for small memory institutions like public library or local museum. After this we will describe digital image anatomy. This will include concepts like digital image, file formats and compression types. Moreover we will briefly describe hardware and software which might be used to digitise various kinds of materials (this will be heavily based on current content of the "Digital repositories for small memory institutions" course). Case study showing what formats and software (especially OCR) is used in Poland for processing various types of materials. This session will be summarized with discussion about existing digitisation projects and possible justification for digitisation activities in small memory institutions
How can the basic digitisation workflow look like?
Get PDFThis session will be dedicated to the digitisation workflow. We will describe all basic steps of the workflow from choosing the object to its publication in digital library. Each step may lead to certain pitfalls, during this session we will try to show some examples of common mistakes. Insome cases the most efficient solution is to outsource certain steps in digitisation workflow, we will discuss the role of outsourcing in the closing discussion. Digital content is vulnerable to various threats. Hardware is getting obsolete, software packages are no longer supported by its creators these things can cause that results of digitisation will no longer be useful in the future. We will discuss issues related to long term preservation of digital materials. Apart from traditional digitisation workflow we will also briefly cover the concept of born digital objects, as importance of this type of objects is constantly growing, we will discuss problems related to its long term preservation
No full textPoznańWe present first MD simulation results of C60 adsorption inside a single-walled carbon nanohorn. The assumed carbon nanohorn model and the values of the force field parameters lead to relatively good agreement between simulation and experiment. We show that the confinement of water and ethanol inside a carbon nanohorn strongly changes the properties of confined liquids leading to a decrease in the number of hydrogen bonds, and diffusion coefficients in comparison to bulk. The appearance of C60 inside the nanohorn leads to further decrease in diffusion coefficients of confined solvents
Volume 19 (1) 2013
Get PDFPoznańThe paper deals with an interval difference method for solving the Poisson equation based on the conventional central-difference method. We present the interval method in full details. The method is constructed in such a way that the exact solution is included in the interval solution obtained. Some numerical results obtained in floating-point interval arithmetic are also presented
Federacja Bibliotek Cyfrowych: wsparcie instytucji kultury w udostępnianiu zbiorów on-line, agregacja metadanych na potrzeby Europeany
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Greek case studies for cooperation with Europeana
Get PDFDuring this session participants will have a chance to listen about experience of GreekAggreagator
Volume 19 (1) 2013
Get PDFPoznańUsing simple Metropolis Monte Carlo simulations, the series of virtual porous carbons (VPCs) is generated. During the computations, the carbon EDIP potential is employed. Structures in the series have systematically changing porosity due to the differences in the carbon density. The obtained VPCs are similar to the model proposed by Harris et al., but they do not show its main drawback, because they contain curved fullerene-like sheets, which are interconnected and form one three-dimensional structure. The porosity of VPCs is characterised using a simple geometrical method proposed by Bhattacharya and Gubbins. In order to confirm the reality of the obtained new model carbons and their usefulness for modelling of adsorption phenomena, Monte Carlo simulations of argon adsorption on them are performed. The obtained isotherms are analysed using standard adsorption methods like s-plots, adsorption potential distributions curves and Dubinin-Astakhov model. The results reveal a close relationship between the systematic changes in the porosity and the adsorption properties. The observed regularities correspond with experimental observations and theoretical studies