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Number of results: 58
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Abstract

This study is based on the investigation of AlSb layer thickness effect on heavy−hole light−hole (HH−LH) splitting and band gap energies in a recently developed N−structure based on InAs/AlSb/GaSb type II superlattice (T2SL) p−i−n photodetector.eFirst principle calculations were carried out tailoring the band gap and HH−LH splitting energies for two possible interface transition alloys of InSb and AlAs between InAs and AlSb interfaces in the superlattice. Results show that AlSb and InAs−GaSb layer thicknesses enable to control HH−LH splitting energies to desired values for Auger recombination process where AlSb/GaSb total layer thickness is equal to InAs layers for the structures with InSb and AlAs interfaces

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Authors and Affiliations

M.M. Alyoruk
Y. Ergun
M. Hostut
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Abstract

In his essays and letters written during the occupation, Czesław Miłosz questions the roots of totalitarianism and challenges myths of European culture.
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Authors and Affiliations

Grażyna Borkowska
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Abstract

Toe first Polish satellite was recently launched into orbit. PW-Sat, constructed by students from the Warsaw University of Technology with support from specialists from the PAS Space Research Centre, was canied onboard the European Space Agency's VEGA launch rocket.
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Authors and Affiliations

Jan Pomierny
Maciej Urbanowicz
Piotr Wolański
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Abstract

DNA polymerase is a kind of protein that performs an important function in copying genetic material - a fundamental process in the life of the cell. The high accuracy achieved in replication is only made possible by a wide diversity of polymerase types.
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Authors and Affiliations

Wojciech Kuban
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Abstract

The climate as we know it is a natural resource that is becoming depleted due to the rising demand for energy. The most emission-intensive sectors are those providing for our comfort and welfare. We discuss these issues with Prof. Mirosław Miętus from the Institute of Meteorology and Water Management.
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Authors and Affiliations

Mirosław Miętus
1

  1. Instituteof Meteorology and Water Management– National Research Institute (IMiGW-PIB), Warsaw, Poland
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Abstract

In order to survive, butteńlies of the Maculinea genus must occur together with Myrmica ants, whose nests provide the environment for a significant part of their development.
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Authors and Affiliations

Anna Stankiewicz-Fiedurek
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Abstract

Why is the sexual mode of reproduction so common in nature? What are the advantages of hermaphroditism? Studying water hydra, capable of both sexual and asexual reproduction, may help us better understand the evolution of different reproductive strategies.
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Authors and Affiliations

Anita Kaliszewicz
ORCID: ORCID
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Abstract

For decades, geochemical studies of lake and river sediments have been widely used in prospecting for mineral deposits. Nowadays they are also commonly used to assess the degree to which surface waters are polluted with heavy metals and harmful organic substances.
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Authors and Affiliations

Kinga Małecka
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Abstract

The UN has declared 2008 the International Year of Planet Earth, an opportunity for pursuing ground- breaking research and promoting greater Earth-science awareness.
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Authors and Affiliations

Andrzej Żelaźniewicz
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Abstract

lnterwar Poland was a multinational state inhabited by Poles, Ukrainians, Belarusians, Germans, and Jews. But Poland was also inhabited by people not reflected in any statistics, about which little is in fact known: the assimilated Jews.
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Authors and Affiliations

Anna Landau
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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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Authors and Affiliations

Jerzy Z. Nowak
Jolanta B. Zawilska
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Abstract

The Earth has been home to many species of plants and animals. More than 99% of them are now extinct, though it seems all of them had at least some short period of evolutionary prosperity. How is it that we humans have enjoyed such success, rather than any of the other closely related species that occupied the same or a similar ecological niche?
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Authors and Affiliations

Bogusław Pawłowski
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Abstract

The complexity and refinement of biological phenomena lead many to see them as the work of forces we do not know or understand. Nevertheless, one does not have to resort to any "intelligent design" concept, for instance, to explain the diversity of live on Earth - it suffices to be familiar with the theory of evolution by natural selection and the molecular foundations of biological processes. Our understanding of evolution may be built on a set of relatively simple and verifiable tenets.
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Authors and Affiliations

Adam Łomnicki
Ryszard Korona
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Abstract

Contemporary cosmology poses fundamental questions on the nature and structure of the Universe, its evolution and future.
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Authors and Affiliations

Wojciech A. Hellwing
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Abstract

Current research into fear indicates that there is no single mechanism for triggering fear. However, neuropharmacologists are getting closer to unraveling the mystery.
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Authors and Affiliations

Katarzyna Stachowicz
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Abstract

Shifting living conditions, environmental change, and population migrations are all necessitating changes in how we manage the space in which we live. Does our living have a future?
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Authors and Affiliations

Przemysław Śleszyński
1
Adam Kowalewski
2

  1. Institute of Geography and Spatial Organization, Polish Academy of Sciences in Warsaw
  2. Foundation in Support of Local Democracy, in Warsaw
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Abstract

Orchids are a fascinating world unto themselves, featuring incredible diversity of species, myriad forms and dazzling colors. At the same time, orchids are among the least explored groups of plants, with much work left to be done on their careful classification and study. How should different orchid species be distinguished, and how should the boundaries between different genera be delineated?
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Authors and Affiliations

Marta Kolanowska
1 2

  1. Faculty of Biology and Environmental Protection, University of Łódź, Poland
  2. Department of Biodiversity Research, Global Change Research Institute AS CR, Brno, Czechia
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Abstract

Quantum theory was discovered in 1925 independently by Werner Heisenberg and Erwin Schródlnger, The discovery was the culmination of 25 years of intensive research. Today, its interpretation remains as controversial as it is inspirational.
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Authors and Affiliations

Marek Żukowski
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Abstract

Rapidly developing artificial intelligence technologies are expected to help us in various sectors of life, but their applications also entail certain risks.
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Authors and Affiliations

Piotr Kaczmarek-Kurczak
1

  1. Centre for Space Studies, Kozminski University– Kozminski ESA Lab in Warsaw
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Abstract

Bulls can now be selected for use in breeding by directly evaluating their genotypes, rather their offspring's milk or meat yields! This represents a revolution in animal husbandry.
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Authors and Affiliations

Lech Zwierzchowski
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Abstract

They are unfairly regarded as junk protein, but the truth is they have not been properly studied due to a lack of suitable tools. So how much do we really know about non-globular proteins?

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Authors and Affiliations

Aleksandra Gruca
Marcin Grynberg
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Abstract

How do bark-beetle outbreaks begin, how do they spread? What are the key factors that affect their population dynamics? Ongoing research has provided some understanding and knowledge, although many questions still remain to be answered fully.

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Authors and Affiliations

Pavel Mezei
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Abstract

Our understanding of the complex processes and mechanisms which occur in various ecosystems is being expanded by a new field of science: biogeochemistry.
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Authors and Affiliations

Lech Wojciech Szajdak

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