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Abstract

This work presents an analysis of vibration signals for bearing defects using a proposed approach that includes several methods of signal processing. The goal of the approach is to efficiently divide the signal into two distinct components: a meticulously organized segment that contains relatively straightforward information, and an inherently disorganized segment that contains a wealth of intricately complex data. The separation of the two component is achieved by utilizing the weighted entropy index (WEI) and the SVMD algorithm. Information about the defects was extracted from the envelope spectrum of the ordered and disordered parts of the vibration signal. Upon applying the proposed approach to the bearing fault signals available in the Paderborn university database, a high amplitude peak can be observed in the outer ring fault frequency (45.9 Hz). Likewise, for the signals available in XJTU-SY, a peak is observed at the fault frequency (108.6 Hz).
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Bibliography

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Authors and Affiliations

Karim Bouaouiche
1
ORCID: ORCID
Yamina Menasria
1
ORCID: ORCID
Dalila Khalfa
1
ORCID: ORCID

  1. Electromechanical Engineering Laboratory, Badji Mokhtar University, Annaba, Algeria
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Abstract

Poland's accession to the EU has focused attention on the need for industry and science to work together - something the Institute of Fundamental Technological Research has always prioritized.
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Authors and Affiliations

Maciej Kowalczyk
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Abstract

Drawing up graphical archeołogical documentation is a very time-consuming endeavor, although new applications of digital technologies are now helping to make it much less so - even under adverse field conditions.
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Robert Żukowski
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Abstract

Over the next 20 years, Poland's most important developmental objectives should be to create a knowledge-based economy and to curtail the scope of unemployment and poverty.
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Zdzisław Sadowski
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Abstract

Though rightfully acclaimed in the world as the devoted researcher of a sensational archeological find - the oldest biblical manuscripts from the Dead Sea, dating back more than 2,000 years - Professor Józef Tadeusz Milik remains relatively little known in Poland. His life and work comprise an extraordinary story, illustrating the kind of contributions Polish researchers have made to world science.
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Dariusz Długosz
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Abstract

Underground methane can be highly lethal, appearing suddenly and mixing with air to form a strongly explosive gas. Dealing with methane quickly and safely requires an efficient system of ventilation and monitoring, ready for any scenario.
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ORCID: ORCID
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Abstract

State patronage for artists and forging bonds between art and society, concepts promoted in the Soviet Union in the early 1930s, also won supporters among Polish artists, who saw them as a remedy for the "crisis of art".
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Abstract

Can disastrous floods be avoided? The answer to that question of course has to be "no": we are simply unable to fully protect against these natural phenomena. Nonetheless, research on the course and consequences of floods is helping us to mitigate their negative social, economic, and ecological impact, and above all to avoid human fatalities.
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Abstract

The hustle-and-bustle of our everyday lives generally prevents us from noticing the fierce, life-and-death battles quietly paying out around us, as incoming "invaders" ruthlessly conquer native species of plants and animals. Can we cope with this problem?
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The Serbs are a fascinating indigenous Slavic minority in the German states of Saxony and Brandenburg. Having preserved their own cultural and linguistic identity through centuries of Germanization and despite Nazi persecution, they now face threats stemming from globalization.
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Elzbieta Wrocławska
Jadwiga Zieniukowa
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Abstract

Space agencies like NASA spend millions of dollars trying to obtain samples of extraterrestrial matter. Nonetheless, several million particles of interplanetary dust actually fall into our atmosphere every day - how can such precious cosmic material be recovered?
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Abstract

Rock drawings found in the south Saharan oasis of Dakhleh, dating back some 7 ,500-6,000 years, portray female figures, giraffes being led by rope, and other scenes. The secrets they hold about The secrets they hold about the lives and beliefs of the oasis and Neolithic inhabitants are now is preparing a doctorate being uncovered by an international on Saharan rock art team of researchers.
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Ewa Kuciewicz
Eliza Jaroni
Michał Kobusiewicz
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Abstract

The Polish archeological mission working on the "Lower Church" at Banganarti in Sudan has uncovered magnificent medieval wall paintings, including an already-famous icon of the praying Madonna - one of the world's oldest images of the Virgin Mary.
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Bogdan Żurawski
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Abstract

Nature's own cycles dictate the biological rhythms of all living organisms. A key role in the complex circadian system is played by melatonin, the "hormone of darkness.
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Jerzy Z. Nowak
Jolanta B. Zawilska
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Abstract

Mighty, robust trees like the chestnut or oak in fact produce surprisingly short-lived seeds. Fortunately, modern cryogenic methods can help prolong their conservation.
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Paweł Chmielarz
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Abstract

Privatizing and restructuring the state-owned agriculture sector has proven to be a difficult and complex process, with broad political, social, economic and spatial repercussions.
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