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Number of results: 6
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Abstract

Filtration is one of the most efficient methods of removing Al2O3 inclusions from liquid steel. The efficiency of this process depends on the physicochemical parameters of liquid metal, inclusion and properties of the applied filters. The particles attracted during filtration undergo agglomeration, collisions and chemical reactions on the filter surface, with the emphasis on the mechanism of particle collisions and the role of material from which the filter was made. The aluminum oxide inclusions collide with the filter surface and as the growing process continues, the particles also collide with the previously adsorbed inclusions. At the interface of particle and filter the mixing of the metal bath is most intense, being a result of a sudden change of flow direction and breaking up the stream of liquid metal which is in a direct contact with material. The efficiency of filtration is defined not only by the behavior of individual particles but of all population. The simulations revealed that only a small fraction of these particles adheres directly to the filter material; most of them stick to the former ones. Attention should be also paid to the fact that some of the inclusions which contacted the filter walls do not form a permanent connection and are then entrained by metal. Authors solved the problem of agglomeration and collisions of Al2O3 inclusions with the ceramic surface of the filter with the PSG method, mainly used for the analysis of agglomeration of inclusions during steel refining in the ladle.

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Authors and Affiliations

D. Kalisz
K. Kuglin
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Abstract

The article presents the results of experimental investigations of interactions between a deformable structure and a liquid. The investigations were performed on two prismatic tanks with elastically deformable top walls. During the investigations, different levels of tank filling with liquid were examined. The investigation of this phenomenon has direct reference to frequently recorded real events, such as collision of a tanker with another ship or a harbour berth, rapid braking of a road or rail tanker, etc. Recognition of this phenomenon is based on simultaneous measurements of the following parameters:

1. excited accelerations of the tank-liquid system,

2. elastic accelerations of top walls of the tank,

3. hydrodynamic pressures on the deformable top walls.

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Authors and Affiliations

Kazimierz Trębacki
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Abstract

Concrete hollow thin-walled high piers (CHTWHPs) located in mountainous areas may be destroyed by the huge impact force of accidental rocks. The study focuses on analyzing the effects of rock impact on the pier, including its impact force, pier damage, dynamic response, and energy dissipation characteristics. The results show that: (1) Increasing the impact height led to a decrease in the peak impact force. Specifically, 15.5% decrease in the peak collision force is induced when the height of rock collision rises from 10 m to 40 m. (2) The damage mode of the pier’s collision surface is mainly oval damage with symmetrical center, radial damage on the side surface, and corner shear failure on the cross section. (3) The peak displacement of bridge pier increases with the increase of collision height. As the collision height increased from 10 m to 40 m, the bridge pier’s peak displacement also increased, rising by 104.2%. (4) The concrete internal energy gradually decreased with increasing collision height, dropping by 36.9% when the height of rock collision rises from 10 m to 40 m. The reinforcement internal energy showed an increase of 78%. The results of this study may provide reference for the rock collision resistance design of CHTWHPs.
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Authors and Affiliations

Yao. Huang
1
ORCID: ORCID

  1. Nanning College of Technology, Guangxi, 541006, China
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Abstract

This paper presents an estimation method for the spatial pose and displacement parameters of multi-rod suspension mechanism, based on measurement results by using wire sensors. Some changes of position and orientation of the platform fixed to wheel knuckle cause corresponding changes of sensors’ cable lengths. The fixation points of the cable sensors are selected with the collision-free conditions taken into account. Numerical example deals with platform poses and positioning of the sensors that satisfy the measurement conditions.

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Authors and Affiliations

Marta Góra
Józef Knapczyk
Michał Maniowski
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Abstract

Marine casualties, at sea or in port waters, are not only caused by large passenger or cargo vessels, which, due to their size, may have difficulty in giving way or stopping safely, but also small vessels such as marine yachts or jet skis, which have a high manoeuvrability but mistakes made when navigating or manoeuvring by the operators of these vessels can be serious. The aim of this article is to analyze the collision of two such crafts in port waters in the aspect of criminal liability of the perpetrator of the accident for causing it.
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Authors and Affiliations

Cezary Łuczywek
1
ORCID: ORCID

  1. były Przewodniczący Państwowej Komisji Badania Wypadków Morskich
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Abstract

Professor Łucjan Krause, a long-term head of the Department of Physics of the University of Windsor died on July 4, 2022 in Windsor, Ontario in Canada. He was an outstanding Polish-Canadian physicist, who made important contributions to the atomic, molecular and optical physics. Born in Poznań on January 8, 1928, as a scout and Home Army soldier (nickname “Leonidas”), he took part in the Warsaw Uprising and after its failure was sent to a POW camp in Bergen-Belsen, in Germany. In 1951 after graduating from King’s College University of London, he emigrated to Canada, where he began his studies of physics at the University of Toronto. In 1955 he obtained in Toronto the PhD degree in physics under the supervision of Professor Harry Welsh in Raman spectroscopy of gases. Then for three years he worked as an associate professor of physics at the Memorial University of Newfoundland in St. John’s. In 1958 he accepted an invitation from the University of Windsor and became a head of its Department of Physics. In Windsor, Krause created a vibrant scientific centre in which he developed research program in experimental studies of inelastic atomic collisions. The main attention was focused on the excitation energy transfer between colliding atoms, the quenching of fluorescence radiation by molecular gases and, more recently, on laser spectroscopy of metal excimers. In 1963 he initiated the cooperation with Professor Aleksander Jabłoński, head of the Chair of Experimental Physics of Nicolaus Copernicus University in Toruń. Thanks to this cooperation numerous physicists, first from Toruń and later from other Polish scientific centers – as postdoctoral fellows – participated in experiments with the use of advanced laser equipment, not available in Poland at that time. In this way, Łucjan Krause contributed significantly to the development of physics in Poland. In order to pay tribute to his effort and devotion, in 1983 the Senate of Nicolaus Copernicus University awarded Professor Łucjan Krause a doctor honoris causa degree.
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Authors and Affiliations

Józef Szudy
1

  1. Instytut FizykiUMK, Toruń

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