Wyniki wyszukiwania - BazTech

1

Wstępne badania wykorzystania drobnej frakcji chalcedonitowej w technologiach ceramicznych

Dziubak C., Tymowicz-Grzyb P.

Szkło i Ceramika

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2017

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R. 68, nr 6

6--10

PL

Chalcedonit jest unikatowym surowcem krzemionkowym eksploatowanym ze złoża „Teofilów” w Inowłodzu. Specyficzne właściwości surowca, jak wysoka zawartość krzemionki bezpostaciowej oraz duża porowatość (do 25%) sprzyjają wbudowaniu cząstek składnika chromoforowego (Fe2O3) do porów i „zamykaniu go” w osnowie z SiO2 w procesie spiekania wysokotemperaturowego. Dla potwierdzenia i ilościowej oceny wbudowania Fe2O3 do matrycy z SiO2 stosowany jest test wymywalności składnika żelazowego ze struktury spieku w środowisku kwaśnym na gorąco. Otrzymany spiek barwny o charakterze kompozytu ma cechy obydwu składników jednocześnie. Podobnie jak kwarc jest odporny na chemiczne wpływy środowiska w wysokiej temperaturze oraz ma czerwonobrązowe zabarwienie pochodzące od barwy cząstek hematytu. Kolorystyka tworzywa ceramicznego (masa na płytki podłogowe) wyrażona za pomocą parametrów L*, a*, b* dowodzi trwałości barwy spieku, który pełni rolę pigmentu. Przedstawione wyniki badań mające charakter wstępnych, rokują na uzyskanie dobrych efektów okluzji hematytu w matrycy z SiO2 także w powiększonej skali procesu.

EN

Chalcedonite is a unique siliceous material extracted from the Teofilów deposit in Inowłódz, Poland. Specific properties of the material, such as a high content of amorphous silicon dioxide and high porosity (up to 25%) promote an incorporation of the chromophore component (Fe2O3) particles into the pores and their “enclosure” in the SiO2 structure in the process of high-temperature sintering. The test method used for verification and quantitative evaluation of Fe2O3 incorporation into the SiO2 matrix is hot leaching of the ferric component from the sinter structure in an acidic environment. The obtained coloured sinter of a composite character displays the properties of both components simultaneously. Like quartz, it is resistant to chemical influences from the environment at high temperatures; also, it is red-brown due to the colour of the hematite particles. The colouration of the ceramic material (floor tile mass) expressed with the parameters: L*. a*, b*, proves colour stability of the sinter employed as a pigment. The presented study results of a preliminary nature promise good effects of hematite occlusion in the SiO2 matrix, also in largescale processes.

2

Recognition of occluded traffic signs based on two-dimensional linear discriminant analysis

Forczmański P.

Archives of Transport System Telematics

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2013

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Vol. 6, iss. 3

10--13

EN

Traffic signs recognition involving digital image analysis is getting more and more popular. The main problem associated with visual recognition of traffic signs is associated with difficult conditions of image acquisition. In the paper we present a solution to the problem of signs occlusion. Presented method belongs to the group of appearance-based approaches, employing template matching working in the reduced feature space obtained by Linear Discriminant Analysis. The method deals with all types of signs, regarding their shape and color in contrast to commercial systems, installed in higher-class cars, that only detect the round speed limit signs and overtaking restrictions. Finally, we present some experiments performed on a benchmark databases with different kinds of occlusion.

3

Recognition of partially occluded shapes using a neural optimization network

Banerjee B.

Machine Graphics and Vision

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2004

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Vol. 13, No. 1/2

3-23

EN

The current work presents an algorithm for recognition of partially occliided shapes in a cluttered scene The images are represented by a sequence of angles subtended at the corner points. The cost due to comparison between the input cluttered scene and the stored images is obtained from a cost function designed to storo the obtained information in the form of a cost matrix which is presented to the input of an optimization network. The parameters of the optimization network are determined so as, to minimize an energy function, the minima of which occur at the solutions of the problem. The results, as obtained in different domains (2D shapes and projected 3D shapes) with different degrees of occlusion, provide intereSting insights into the operation of the algorithm as well as avenues for future research.

4

Extraction of data from low quality photographs to aid the construction of virtual reality models of archeological sites

Williams J. G., Blake E. H., Ruther H.

Machine Graphics and Vision

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2001

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Vol. 10, No. 3

353-368

EN

A tool has been constructed to use information extracted from photographs captured using uncalibrated cameras to fill occlusions which occur in three-dimensional models of photogrammetrically captured sites. Capturing the geometry of archeological sies by photogrammetric means is relatively expensive and, because of the typical layouts of such sites, usually results in a degree of occulusion. The essential philosophy underlying the tool is to segment each occlusion into surfaces which may be approximated using curves, and then use the known geometry in the region of the occlusion to calculate the most probable locations of the junctions of such surface segments. Texture of the surface segments is then applied to the tree-dimensional model. The tool has been applied to occulations of various configurations thatb are expected to be typical for archeological sites, and has been found to deal well with such features and to provide accurate patches from typical data sets. It is also shown that the tree-dimensional geometric model is clearly improved by the filling-in of the occlusion.

5

Experimental evaluation of occlusal forces

Chladek W., Lipski T., Karasiński A.

Acta of Bioengineering and Biomechanics

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2001

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Vol. 3, nr 1

25-37

EN

The paper presents the results of measuring the occlusion forces in the group of 163 subjects being tested. In the research, the method based on the dependence of the plastic deformity and force intending the spherical penetrator upon each other in a metal sample was implemented. The results obtained allowed us to estimate the distribution of occlusion forces along the alveolar ridge and to define the dimensions of the maximum forces applied, while biting and gnawing. The biting force between the first incisors for different angles of parting mandible was also measured.

6

Metoda badania sił zgryzu wykorzystująca deformację plastyczną próbek z blachy aluminiowej.

Chladek W., Lipski T.

Inżynieria Materiałowa

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1998

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R. XIX, nr 2

57-59

PL

W pracy przedstawiono nową metodę pomiaru sił zgryzu opartą na zależności pomiędzy wielkością odcisku w blasze aluminiowej a siłą wgniatającą penetrator w kształcie kulki. Metodę sprawdzono dokonując badań klinicznych 120 osób. Uzyskane wyniki pozwoliły na ocenę rozkładu sił zgryzu wzdłuż łuku zębowego oraz określenie maksymalnych sił pomiędzy zębami trzonowymi i przedtrzonowymi.

EN

The work presents the new method of measuring the occlusion forces and the results of investigations in a group of 120 tested subjects. In the research the method based on interdependence between the plastic deformity and force indenting the spherical penetrator in the metal sample was implemented. The obtained results allowed to estimate the distribution of occlusion forces along the alverolar ridge and define the dimensions of the maximum forces applied while biting and gnawing.