Wyniki wyszukiwania - Biblioteka Nauki

1

An Approach to Modelling Mechatronic Devices Based on Ropohl's System Theory of Technology

100%

Gawrysiak M.

Machine Dynamics Problems

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2004

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tom Vol. 28, No. 3

107-112

EN

The formal system model of technology, developed by German engineer and philosopher G. Ropohl, is filled with mechatronic contents. In the model the elements of human and social sciences are tied with element of natural and technical sciences. Two central system concepts - system of actions and system of things - are used in this context. A general model of mechatronic action system is developed. This abstract mechatronic action model is interpreted empirically to model which can be identified with a mechatronic device.

2

Mechatroniczne projektowanie maszyn

100%

Gawrysiak M.

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tom R. 6, z. 1

26-42

PL

Pokazano strukturę systemu realizowanego przez integrację mechaniki, elektroniki, automatyki i informatyki (systemu mechatronicznego), wychodząc z definicji maszyny, jako systemu przetwarzającego materiał, energię i informację. Przedstawiono istotę mechatronicznego podejścia do projektowania maszyn w porównaniu z tradycyjnym podejściem mechanicznym. Opisano wymagania, jakie stawia ono projektantom, oraz charakterystyczne jego cechy: integrowanie różnych technik, modularność konstrukcji i kompensację nieliniowości mechanicznych za pomocą sterowania. Scharakteryzowano etapy projektowania, ze szczególnym uwzględnieniem etapów typowych dla systemów mechatronicznych.

EN

Based on the machine definition as a material, energy and information processing system, the paper presents the structure of the mechatronic system, which is realized by integration of mechanical engineering, electronical engineering, control engineering and computer technology. The essence of the mechatronic approach to machine design in comparison with traditional mechanical approach is discussed. The requirements for mechatronic design and its features are presented. The design stages, especially connected with mechatronic approach, are described.

3

Mechatroniczne ujęcie komponentów stanowiska do laserowego grawerowania szkła

63%

Trochimczuk R. , Gawrysiak M.

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tom Z. 13

235-244

PL

Artykuł prezentuje mechatroniczny model laserowego stanowiska do formowania trójwymiarowych obiektów wewnątrz szkła lub innych przezroczystych dielektryków. Opisuje również hybrydowy elektro-pneumatyczny układ pozycjonera wraz z kartą sterującą oraz charakteryzuje oprogramowanie sterujące procesem grawerowania laserowego.

EN

A mechatronic model of laser engraving system for three-dimensional object forming in glass or other transparent dielectrics is presented. The hybrid electric-pneumatic positioning system with applied control card and control software is discussed.

4

Left ventricle systolic volume in vasovagal syncope patients

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Kozlowski D. , Byrdziak P. , Krupa W. , Gawrysiak M. , Piwko G. , Kubica J. , Swiatecka G.

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2003

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tom 62

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nr 3

175-178

EN

One of the hypotheses put forward concerning the mechanism of vasovagal syncope is that the vagal afferent fibres are activated during vigorous contractions against a partly empty left ventricle. The aim of the study was to confirm this hypothesis by using 2D echocardiography during a head-up tilt test. The study was carried out on 39 patients (17 male, 22 female, age range 21–64 years), all with a history of recurrent syncope. The patients were examined using a 2D echo to measure the end-diastolic and end-systolic volume before the head-up tilt test after the Westminster protocol (45min/60 grade) and every five minutes after tilting. T patients during head-up tilt test had a positive response and 32 proved negative. A reduction of both the end-diastolic and end-systolic volumes of the left ventricle was noticed. There was no significant difference in the degree of ejection fraction reduction. The difference in ejection fraction reduction between the two groups was similarly non-significant. It was also noticed that the patients with a positive response had more vigorous contractions than those with a negative test. The decision was therefore taken to use a different parameter for the left ventricle contraction, namely the LV posterior wall slope. As this parameter is partly dependent on time, its use in confirming the extremely vigorous nature of the contractions was considered appropriate. Only 6 patients were tested using this parameter. A tendency towards greater left ventricle posterior wall slope values, both before and during tilting was noticed in the group of patients with vasovagal reaction. Our data shows that vigorous contraction is probably less responsible for vasovagal syncope release than left ventricle volume reduction.

5

Diameter of the cavo-sinus-tricuspid area in relation to type I atrial flutter

38%

Kozlowski D. , Hreczecha J. , Skwarek M. , Piwko G. , Kosinski A. , Gawrysiak M. , Grzybiak M.

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nr 2

EN

Cardiac arrhythmias have troubled patients and fascinated physicians for centuries. The twentieth century was an era of progress, when the mechanism of cardiac disorders became more commonly recognised. Arrhythmias may be due to abnormalities of automaticity, to abnormalities of conduction, or to a combination of both. In order for re-entry to occur, an area of slowing conduction combined with unidirectional block must be present. Much investigation has centred on the underlying re-entry mechanisms of atrial flutter. In the light of these facts, it would seem that a close acquaintance with the detailed topography of the vena cava orifice (cavo), coronary sinus orifice (sinus) and the attachment of the septal leaflet of the tricuspid valve (tricupid) area could be of great interest, especially for invasive cardiologists. The research was conducted on material consisting of 41 hearts of humans of both sexes from the age of 12 to 80 (6 female, 35 male). Classical macroscopic methods of anatomical evaluation were used. The following measurements were made: the shortest distance between the Eustachian valve and the attachment of the tricuspid valve on the left margin of the coronary sinus orifice (diameter 1), the distance between the attachment of the tricuspid valve and the inferior margin of the sinus orifice (diameter 2), the distance between the Eustachian valve and the attachment of the tricuspid valve on the right margin of the coronary sinus orifice (diameter 3), the distance between the inferior margin of the vena cava inferior and the attachment of the tricuspid valve (diameter 4) and, finally, the diameter between the attachment of the septal cups of the tricuspid valve and the external border of the vena cava inferior (diameter 5). No correlation was found between the age and sex of the three groups of the material. The dimensions of the structure examined were similar in the three groups of hearts. In young adult hearts all the diameters measured ranged from 4 to 47 mm The average diameters were, respectively: 15.02 mm (diameter 1), 8.97 mm (diameter 2), 17.27 mm (diameter 3), 26.87 mm (diameter 4), 36.42 mm (diameter 5). In the mature adult hearts all the diameters measured ranged from 8 to 45 mm: 18.19 mm (diameter 1), 10.54 mm (diameter 2), 19.95 mm (diameter 3), 28.90 mm (diameter 4), 39.63 mm (diameter 5). In the older adults hearts all the diameters measured ranged from 4 to 47 mm. The average diameters were, respectively: 15.65 mm (diameter 1), 8.70 mm (diameter 2), 7.25 mm (diameter 3), 26.80 mm (diameter 4), 35.85 mm (diameter 5).