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Wyszukujesz frazę "aberrations" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Look at gene, chromosome and genome – molecular cytogenetic investigations
Autorzy:
Małuszyńska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/703863.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chromosome
cytogenetics
DNA
FISH
genome research
chromosome aberrations
evolution
molecular biology
Opis:
Cytogenetics is complementary to genetic and molecular analysis of genome structure and function. From the beginning it has been mainly used for identification of chromosomes and karyotype construction. Most significant for the progress in cytogenetics was development of chromosome banding techniques and in situ hybridization, especially fluorescent in situ hybridization (FISH) and its different modifications which have become the most important techniques in molecular cytogenetics. FISH allows physical gene mapping and localization of different non-coding DNA sequences on chromosomes and interphase nuclei. Repetitive DNA sequences can generate unique FISH-signal patterns on individual chromosomes valuable for karyotyping and phylogenetic analysis. These studies have important implications for basic research and practical applications. The understanding of the structure, function, organization and evolution of genomes enabled many new cytogenetic applications to both medicine and agriculture, particularly in diagnosis and plant breeding.
Źródło:
Nauka; 2007, 4
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wigner transform approach to dynamic-variable partially coherent laser beam characterization
Autorzy:
Jabczyński, J.
Gontar, P.
Gorajek, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/202109.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser beams
partial coherence
high-power continuous-wave lasers
Wigner transform
aberrations
Opis:
1) Background: the modeling, characterization, transformation and propagation of high-power CW laser beams in optical (including fiberoptic) trains and in the atmosphere have become hot topics in laser science and engineering in the past few years. Single-mode output is mandatory for high-power CW laser applications in the military field. Moreover, an unstationary, dynamic operation regime is typical. Recognized devices and procedures for laser-beam diagnostics could not be directly applied because of dynamic behavior and untypical non-Gaussian profiles. 2) Methods: the Wigner transform approach was proposed to characterize dynamically variable high-power CW laser beams with significant deterministic aberrations. Wavefront-sensing measurements by means of the Shack-Hartmann method and decomposition into an orthogonal Zernike basis were applied. 3) Results: deterministic aberration as a result of unstationary thermal-optic effects depending on the averaged power of the laser output was found. Beam quality determined via the Wigner approach was changed in the same way as the measurements of the beam diameter in the far field. 4) Conclusions: such an aberration component seems to be the main factor causing degradation in beam quality and in brightness of high-power CW laser beams.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 141-146
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical analysis and optimization of 3D laser beam shaping
Autorzy:
Traczyk, M.
Wojtanowski, J.
Mierczyk, Z.
Zygmunt, M.
Knysak, P.
Drozd, T.
Muzal, M.
Powiązania:
https://bibliotekanauki.pl/articles/200923.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser beam shaping
optical aberrations
non-imaging optics
kształtowanie wiązki laserowej
aberracja optyczna
optyka bez obrazowania
Opis:
We report methodology of three-dimensional laser beam shaping. The analytical and numerical analysis is presented. A strategy for designing optical system involves the controlled application of aberrations which is realized by specific aspheric lens shaping. The goal is to obtain the desired optical power density distribution in space, which is optimal for selected application. The proposed method is discussed with regard to the design of optical transmitter for laser shooting simulator, however the developed methodology can be used for a number of other light shaping applications.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 555-560
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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