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Number of results: 13
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Abstract

The article presents a spatial data model describing a geographical space which makes it possible to automatically generalize data once the scale of a map has changed. To that end the Molenaar FDS data structure, extended by the geometrical rule, has been applied. The so formed spatial data model has been checked upon the example of the road network of ,,Downtown Cracow", confirmation of the accepted rules for the FDS structure having been acquired.
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Authors and Affiliations

Tadeusz Chrobak
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Abstract

The paper discusses the global algorithm of broken line simplification, that: does not depend on parameters set by a map editor and maintains the accuracy of the 0-1 Instruction (General principles of surveying practice) of the Head Office of Geodesy and Cartography, Poland, for each map scale (smaller than the source map scale). In the discussed process of line simplification parameters depend on the map scale and on the smallest length of an elementary triangle (this length is a measure of the ability of the drawing recognition). In the process of simplification performed with the use of the discussed algorithm, the same shape of a line is ensured (maintaining the ability of the drawing recognition), since generalised data differ with the bigger or smaller range of scales from the source data. Besides, limits of intervals of generalisation thresholds have been specified, which are required for the process of automated selection of cartographic presentation methods exhibiting the results of line simplification.
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Authors and Affiliations

Tadeusz Chrobak
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Abstract

The paper presents the least admissible dimensions of black lines of spatial object images, according to Saliszczew, adjusted to the needs of database generalization. It is pointed out, that the adjusted dimensions are in agreement with the cartographic norm included in the National Map Accuracy Standards , and their application to the generalization 1 will allow, for any map scale, the determination of the: • value of the scale-dependent parameter of the generalization process, without user action; • measure of recognizability of the shortest black line section on the map, what helps to obtain unique results of line generalization; • measure of recognizability of black lines in the image – using a standard (elementary triangle) – helpful in obtaining unique result of line simplification, and an assessment of the process; • recognizability distance between lines of close buildings, securing unique aggregation of them; • verification of spatial object image lines visualization. The new solutions were tested with the Douglas-Peucker (1973) generalization algorithm, modified by the author, which treats the minimal dimensions as geometric attributes, while object classes and their data hierarchy as descriptive attributes. This approach secures uniqueness of results on any level of generalization process, in which data of spatial objects in the DLM model are transformed to conform with the requirements for the DCM model data.
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Authors and Affiliations

Tadeusz Chrobak
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Abstract

Thiswork presents results of comparative studies of the optical absorption coefficient spectra of ion implanted layers in silicon. Three nondestructive and noncontact techniques were used for this purpose: spectroscopic ellipsometry (SE), modulated free carriers absorption (MFCA) and the photo thermal radiometry (PTR). Results obtained with the ellipsometric method are the proof of correctness of the results obtained with the MFCAandPTRtechniques. These techniques are usually used for investigations of recombination parameters of semiconductors. They are not used for investigations of the optical parameters of semiconductors. Optical absorption coefficient spectra of Fe+ and Ge+ high energy and dose implanted layers in silicon, obtained with the three techniques, are presented and compared.

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Authors and Affiliations

Krzysztof Dorywalski
Łukasz Chrobak
Mirosław Maliński
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Abstract

Esej stanowi historyczną analizę kategorii Obcego. Autor wyszczególnia dwa jej rozumienia, które pojawiły się w dwudziestowiecznej myśli społecznej. Pierwsze traktuje obcość jako własność odnoszącą się do zewnętrznych relacji grupy, drugie zaś jako charakterystykę relacji grupy względem funkcjonujących w jej obrębie mniejszości. Na bazie tego rozróżnienia autor proponuje dwa modele Obcego: oparty na kategorii członkostwa oraz oparty na kategorii uznania. Omawia je bazując na tekstach takich klasyków jak Simmel i Schütz, oraz autorów współczesnych, jak Taylor i Bauman. W trakcie prowadzonych analiz historycznych wskazane zostaje bliskie pokrewieństwo obu tych modeli. Współczesny model uznania implikuje mianowicie traktowanie przedstawicieli różnorodnych tradycji kulturowych jako członków tej samej wspólnoty moralnej. Autor zwraca również uwagę na podobną zależność w przypadku zjawiska radykalnego Obcego, gdzie brak uznania łączy się ściśle z aktem wykluczenia moralnego. Przedstawione analizy mają na celu identyfikację głównych nurtów interpretacyjnych kategorii Obcego oraz wskazanie tendencji, jakim rozumienie tej kategorii współcześnie podlega.
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Authors and Affiliations

Karol Chrobak
1
ORCID: ORCID

  1. Instytut Nauk Socjologicznych i Pedagogiki, Szkoła Główna Gospodarstwa Wiejskiego w Warszawie
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Abstract

The photoacoustic cell is the heart of the nondestructive photoacoustic method. This article presents a new simple lumped-components CRLC model of the Helmholtz type photoacoustic cell. This model has been compared with the well known literature models describing the Helmholtz type cells for photoacoustic spectroscopy. Experimental amplitude and phase frequency data obtained for the two photoacoustic cells have been presented and interpreted in a series of models. Results of the fitting of theoretical curves, obtained in these models, to the experimental data have been shown and discussed.

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Authors and Affiliations

Łukasz Bartłomiej Chrobak
Mirosław Andrzej Maliński
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Abstract

This paper presents maps of spatial distributions of the short circuit current Isc(x,y) and the open circuit voltage Uoc(x,y) of the investigated low cost solar cells. Visible differences in values of these parameters were explained by differences in the serial and shunt resistances determined for different points of solar cells from measurements of I–V characteristics. The spectral dependence of the photo voltage of solar cell is also shown, discussed and interpreted in the model of amorphous and crystal silicon.
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Authors and Affiliations

Łukasz Bartłomiej Chrobak
Wiesław Ryszard Madej
Mirosław Andrzej Maliński
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Abstract

The paper refers to pulverization and sintering of the (Fe80Nb6B14)0.88Tb0.12 high coercive alloy. The powder was sintered using the ultra-fast current aided method. It turned out that too long discharge time leads to appearing of a soft magnetic phase and simultaneously, decrease in coercivity of the compacted powder. Nevertheless, it was possible to establish preference technology parameters, preserving magnetic hardness of the alloy. As a final test, an impact of Co-powder addition on magnetic properties was studied. The introduced soft magnetic phase (about 20 wt. %) caused about 30% increase of magnetic remanence, which is a result of direct exchange interactions between the two phases.

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Authors and Affiliations

K. Granek
G. Ziółkowski
A. Chrobak
J. Klimontko
J. Rak
O. Zivotsky
L. Gembalova

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