Wyniki wyszukiwania - BazTech

1

Motion characteristics after ricochet: an experimental investigation

Chen Guoming, Hu Junhua, Liu An, Feng Jinfu, Hu Qingqing

Polish Maritime Research

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2020

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nr 2

4--10

EN

The ricochet behaviour of the air–water trans-media vehicle (AWTMV) during water-entry crossing was experimentally investigated. Three types of small-scale AWTMV including cone, ogive, and flat nose were used in the test. The underwater trajectory, velocity, and inclination angle of projectiles during the ricochet process were obtained using a high-speed camera. The angle change of the AWTMV and the ratio of the residual velocity are introduced. Based on this result, the relationship between the ricochet responses and initial conditions was derived. The results of this study show that (1) a small incident angle and great velocity make the occurrence of ricochet behaviour easier, (2) the stability of the trajectory of projectiles with cone, ogive, and flat nose weakened in turn at the same initial conditions, (3) the angle change and the ratio of the residual velocity are linear functions of the incident angle and velocity.

2

The die reconstruction of the sterile inflatable nasal tubes for haemorrhage prevention

Grabowik C., Janik W., Kalinowski K.

Selected Engineering Problems

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2013

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nr 4

91--96

EN

This paper presents the reconstruction process of medical devices designed for prevention of the haemorrhage in the nasal cavity. The DEMED company (the medical parts plant) turned to authors in order to start a scientific project concerning the problem of elements reconstruction in case of lack of technical documentation. The additional problem with original parts resulted from the original parts manufacturing technology – parts were handmade. The economic purpose from DEMED company angle was to increase the production volume thanks to accessibility of greater number of moulds designed and produced on the basis of reconstructed parts geometry. The proposed in the paper solution is based on hybrid model and selected cross-sections transfer into 2D CAD software in order to prepare technical documentation. In the reconstruction process the 3D scanning was used.

3

Automatic segmentation of characteristic areas of the human head on thermographic images

Koprowski R., Wojaczynska-Stanek K., Wrobel Z.

Machine Graphics and Vision

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2007

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Vol. 16, No. 3/4

251-274

EN

In the paper a new algorithm for the automatic segmentation of characteristic areas of the human head in a thermovision image is presented. The analysed regions include: forehead, area of sinuses and back of the neck. The covered set of approaches, which are mainly algorithms employing morphological operations, neural networks and methods based on human head proportions, can provide satisfying completely results for a doctor's practice in a fully automatic way.