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Number of results: 24
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Abstract

Modernism in pre-WWII architecture ossified rather than abolished the division of the city space into a public area, as the domain of men, and a private area assigned to women. Even female architects' involvement in designing new modernistic housing estates did not change this situation, as the example of Polish design demonstrates.
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Marta Leśniakowska
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Abstract

One of the most fascinating problems in contemporary science is the generation of shapes and patterns in biological systems.
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Authors and Affiliations

Andrzej L. Kawczyński
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Abstract

The year 2004 has been named the "Year of Gombrowicz" in commemoration of the author's 100th birthday. Scholars both in Poland and abroad are taking a new look at his output and originality (or "authenticity," as the author himself might have preferred).
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Authors and Affiliations

Jerzy Jarzębski
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Abstract

Prior to the mid-1980's, the term "bank" referred almost exclusively to financial institutions. The advent of the "biodiversity" concept, however, has led to the appearance of so-called "gene banks".
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Authors and Affiliations

Jerzy T. Puchalski
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Abstract

High-pressure physics in quest of the mechanisms of protein non-native self-assembly: from hardboiled eggs to prions.
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Wojciech Dzwolak
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Abstract

Part of the center of contemporary Warsaw was at one time the Warsaw Ghetto, a closed district where Polish Jews were forced by the Nazis to live from October 1940 to May 1943. This part of the city no longer exists in its prewar form.
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Authors and Affiliations

Barbara Engelking-Boni
Jacek Leociak
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Abstract

New software makes it possible for the blind to access scientific information written in mathematical notation.
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Włodzimierz Wysocki
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Abstract

Laboratory animals selectively bred for their preference to alcohol can make a substantial contribution to our understanding of human alcoholism.
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Wojciech Kostowski
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Abstract

The shape of the city and its spatial arrangement depend upon the key actors on the urban stage. In the pre-1989 era this meant the Communist party and the professional groups that were encompassed in the institutions of real socialism. In today's Poland the party has been replaced by the market.
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Authors and Affiliations

Marek S. Szczepański
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Abstract

The urban environment is strongly exposed to pollution, mainly from industry and road traffic. Good pollution control can only be guaranteed when the exact sources and concentrations of toxic substances are known. When there are many polluters in a relatively small area, isotopes may help to "fingerprint" them.
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Authors and Affiliations

Robert Bachliński
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Abstract

In the 9th-11th centuries, Poland was characterized by a process whereby Slavic society was adapted into a civilization founded on Mediterranean culture, resulting in the emergence of a new, open society. Two kinds of social bonds came to coexist: on the one hand there were tribal community bonds founded mainly on territorial and family unity, while on the other there were new bonds based upon the institutions of the state.
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Authors and Affiliations

Henryk Samsonowicz
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Abstract

Biological parameters of the human body can tell the story of an individual's level of education and place of residence.
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Authors and Affiliations

Alicja Szklarska
Halina Kołodziej
Sławomir Kozieł
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Abstract

Cities offer animals new sources of food, new habitats (sometimes completely different form their natural ones) and niches that can be settled in without facing competition or a large number of predators.
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Authors and Affiliations

Grażyna Winiarska
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Abstract

For more than 50 years, the staff at the Institute of Physics have been researching matter and radiation, seeking new phenomena, materials, and applications.
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Hanna Przybylińska
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Abstract

In recognition of the quality of research the European Commission awarded our Institute the status of a Center of Excellence.
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Authors and Affiliations

Michał Zimecki
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Abstract

Since 1989, some of Poland's cities have experienced an investment boom. Taking Warsaw as an example, we can observe what impact direct foreign investments have had on the social space of the city and on processes of metropolization.
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Authors and Affiliations

Bogdan Jałowiecki
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Abstract

This study investigated the suitability of Ijero-Ekiti quartz as a refractory raw material for industrial furnace applications. In order to ascertain its prospective applications, the thermal behaviour, mineralogical composition and chemical composition were determined. Ijero-Ekiti quartz was characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Thermogravimetric and Differential Thermal analysis (TGA and DTA). Its thermal conductivity with specific heat coefficient was determined. The outcome revealed that the quartz sample has a high purity of 94.3% SiO 2, making it suitable as a refractory material. The XRD analysis revealed the presence of alpha-quartz as the dominant crystal phase, which is desirable for refractory applications. The FTIR analysis indicated the absence of hydroxyl (-OH) groups. This indicates a low risk of failure and damage such as spalling, cracking and other forms of damage when produced into bricks. The TGA and DTA displayed significant mass losses and large endothermic bands, which were connected to the dehydroxylation of the quartz rock samples. Based on the demonstrated qualities, the quartz rock sample could be subjected to thermal processing. This study therefore established that Ijero-Ekiti quartz is a suitable raw material for refractory applications due to its high purity, alpha-quartz dominant crystal phase, absence of hydroxyl groups, and uniform morphology.
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Bibliography

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Authors and Affiliations

B.V. Omidiji
1
O.B. Ogundipe
2
H.A. Owolabi
1

  1. Obafemi Awolowo University, Ile-Ife, Nigeria
  2. Landmark University, Omu-Aran, Nigeria
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Abstract

This paper presents the effect of the addition of Ti to the zinc bath. Hot-Dip Galvanizing was carried out on a machined ductile cast iron substrate. The process was carried out at 550°C. Experimental baths A, B and C contained 0.01%, 0.05% and 0.1%Ti, respectively. Metallographic samples were prepared to reveal the microstructure of the coatings. Thickness measurements of the obtained coatings were carried out, and graphs of the approximate crystallization kinetics of the zinc coating were prepared. High-temperature galvanization carried out on the treated surface led to the release of graphite beads from the metal matrix and their diffusion into the coating. This phenomenon can have an adverse effect on the continuity of the coating and its adhesion to the substrate. Crystallization of the δ phase was observed in the coating, and at longer immersion times – a mixture of two-phase δ1 and η phases. With increasing Ti content in the bath, a deterioration in the casting properties of the bath was observed.
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Bibliography

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Authors and Affiliations

Karolina Bracka-Kęsek
1
ORCID: ORCID
Andrzej Szczęsny
1
ORCID: ORCID
Dariusz Kopyciński
1
ORCID: ORCID
Edward Guzik
1
ORCID: ORCID

  1. AGH University of Science and Technology, Department of Foundry Engineering, Al. Mickiewicza 30, 30-059 Kraków, Poland
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Abstract

Compacted Graphite Iron (CGI), is a unique casting material characterized by its graphite form and extensive matrix contact surface. This type of cast iron has a tendency towards direct ferritization and possesses a complex set of intriguing properties. The use of data mining methods in modern foundry material development facilitates the achievement of improved product quality parameters. When designing a new product, it is always necessary to have a comprehensive understanding of the influence of alloying elements on the microstructure and consequently on the properties of the analyzed material. Empirical studies allow for a qualitative assessment of the above-mentioned relationships, but it is the use of intelligent computational techniques that allows for the construction of an approximate model of the microstructure and, consequently, precise predictions. The formulated prognostic model supports technological decisions during the casting design phase and is considered as the first step in the selection of the appropriate material type.
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Authors and Affiliations

Łukasz Sztangret
1
ORCID: ORCID
Izabela Olejarczyk-Wożeńska
1
ORCID: ORCID
Krzysztof Regulski
1
ORCID: ORCID
Grzegorz Gumienny
2
ORCID: ORCID
Barbara Mrzygłód
1
ORCID: ORCID

  1. AGH University of Science and Technology, Poland
  2. Lodz University of Technology, Poland
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Abstract

The increasing demand for high-speed rotor-bearing systems results in the application of complex materials, which allow for a better control of the vibrational characteristics. This paper presents a model of a rotor including viscoelastic materials and valid up to high spin speeds. Regarding the destabilization of rotor-bearing systems, two main effects have to be investigated, which are strongly related to the associated internal and external damping of the rotor. For this reason, the internal material damping is modeled using fractional time derivatives, which can represent a large class of viscoelastic materials over a wide frequency range. In this paper, the Numerical Assembly Technique (NAT) is extended for the rotating viscoelastic Timoshenko beam with fractional derivative damping. An efficient and accurate simulation of the proposed rotor-bearing model is achieved. Several numerical examples are presented and the influence of internal damping on the rotor-bearing system is investigated and compared to classical damping models.
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Authors and Affiliations

Gregor Überwimmer
1
ORCID: ORCID
Georg Quinz
1
Michael Klanner
1
ORCID: ORCID
Katrin Ellermann
1

  1. Graz University of Technology, Institute of Mechanics, Kopernikusgasse 24/IV, 8010 Graz, Austria

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