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    Wyświetlanie 1-5 z 5
    Tytuł:
    The influence of shade on phenolic compounds in Scots pine
    Autorzy:
    Giertych, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/41283.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    light reduction
    Scotch pine
    ortho-diphenol
    pollution
    shade
    Pinus sylvestris
    bioindication
    insolation
    total phenol
    phenolic compound
    Opis:
    The influence of light reduction on the growth and phenolic compounds contents in Scots pine trees and seedlings was studied. Results of the first experiment in field conditions show that shade causes an increase of phenolic compounds and in the second experiment with seedlings under controlled shading conditions the results were opposite. It is suggested that the factor insolation should be paid more attention during the studies on the influence of pollution on the content of phenolic compounds.
    Źródło:
    Dendrobiology; 2001, 46
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Light Fidelity (Li-Fi) overview and investigation into connection speed
    Autorzy:
    Sharma, Mithun
    Sharma, Shilpi
    Powiązania:
    https://bibliotekanauki.pl/articles/1818970.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    Light Fidelity
    Li-Fi
    Six-Sigma
    defect reduction
    wireless communication
    redukcja wad
    komunikacja bezprzewodowa
    Opis:
    The overarching aim was to reduce the frequency of connection failures that occur due to the connection speed and reliability, and identify, characterise and optimise the key process input variables (KPIVs). An experimental research approach with an inbuilt planned manipulation to one or more variables in the experimental data set was adopted. Key elements of the Six-Sigma methodology were applied to resolve the issue of high failures due to connection speed and reliability between two Li-Fi transceivers. KPIVs were successfully identified, characterised and optimised to implement a permanent corrective action to ensure a reduction in connection failures from 17% to 0%. The alignment between two Li-Fi transceivers along with Li-Fi cut-out was found to be critical in achieving good connection speed and reliability. The interference due to ambient visible spectrum lighting found to be statistically insignificant. This study explored the application and benefits of accessible wireless data communication technologies. Moreover, it sheds light on the probable factors that may influence Li-Fi connection speed and areas for future research. The current research provides a Six- Sigma based solution to high connection failure rates while using an infrared-based Li-Fi transceiver. Results also offer insights into the analytical tools that were found to be effective during the problem-solving process.
    Źródło:
    Engineering Management in Production and Services; 2021, 13, 1; 63--73
    2543-6597
    2543-912X
    Pojawia się w:
    Engineering Management in Production and Services
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza czynnikowa zdjęć wielospektralnych
    Principal component analysis of multispectral images
    Autorzy:
    Czapski, P.
    Kotlarz, J.
    Kubiak, K.
    Tkaczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/213759.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    PCA
    metody statystyczne
    bioróżnorodność
    krzywe blasku
    redukcja danych
    statistical methods
    biodiversity
    light curves
    data reduction
    Opis:
    Analiza zdjęć wielospektralnych sprowadza się często do modelowania matematycznego opartego o wielowymiarowe przestrzenie metryczne, w których umieszcza się pozyskane za pomocą sensorów dane. Tego typu bardzo intuicyjne, łatwe do zaaplikowania w algorytmice analizy obrazu postępowanie może skutkować zupełnie niepotrzebnym wzrostem niezbędnej do analiz zdjęć mocy obliczeniowej. Jedną z ogólnie przyjętych grup metod analizy zbiorów danych tego typu są metody analizy czynnikowej. Wpracy tej prezentujemy dwie z nich: Principal Component Analysis (PCA) oraz Simplex Shrink-Wrapping (SSW). Użyte jednocześnie obniżają znacząco wymiar zadanej przestrzeni metrycznej pozwalając odnaleźć w danych wielospektralnych charakterystyczne składowe, czyli przeprowadzić cały proces detekcji fotografowanych obiektów. W roku 2014 w Pracowni Przetwarzania Danych Instytutu Lotnictwa oraz Zakładzie Ochrony Lasu Instytutu Badawczego Leśnictwa metodykę tą równie skutecznie przyjęto dla analizy dwóch niezwykle różnych serii zdjęć wielospektralnych: detekcji głównych składowych powierzchni Marsa (na podstawie zdjęć wielospektralnych pozyskanych w ramach misji EPOXI, NASA) oraz oszacowania bioróżnorodności jednej z leśnych powierzchni badawczych projektu HESOFF.
    Mostly, analysis of multispectral images employs mathematical modeling based on multidimensional metric spaces that includes collected by the sensors data. Such an intuitive approach easily applicable to image analysis applications can result in unnecessary computing power increase required by this analysis. One of the groups of generally accepted methods of analysis of data sets are factor analysis methods. Two such factor analysis methods are presented in this paper, i.e. Principal Component Analysis (PCA ) and Simplex Shrink - Wrapping (SSW). If they are used together dimensions of a metric space can be reduced significantly allowing characteristic components to be found in multispectral data, i.e. to carry out the whole detection process of investigated images. In 2014 such methodology was adopted by Data Processing Department of the Institute of Aviation and Division of Forest Protection of Forest Research Institute for the analysis of the two very different series of multispectral images: detection of major components of the Mars surface (based on multispectral images obtained from the epoxy mission, NASA) and biodiversity estimation of one of the investigated in the HESOFF project forest complexes.
    Źródło:
    Prace Instytutu Lotnictwa; 2014, 1 (234) March 2014; 143-150
    0509-6669
    2300-5408
    Pojawia się w:
    Prace Instytutu Lotnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of IPL technology in acne vulgaris treatment: a case report
    Autorzy:
    Koziolek, A.
    Chilicka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1691.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Tematy:
    human disease
    skin disease
    acne vulgaris
    treatment
    cosmetology
    IPL technology
    intense pulsed light technology zob.IPL technology
    skin eruption
    reduction
    Opis:
    Background: Intense pulsed light (IPL) technology has been used by cosmetic and medical practitioner since 1990. Initially it was only used to remove unnecessary hair, but over time, it began to be used for anti-aging treatments, removing erythema, acne lesions, and acne scars. Aim of the study: The aim of this study is to investigate how the use of IPL technology has affected acne lesions and to determine whether the condition of the patient’s skin has improved. Material and methods: A young woman who was struggling with ordinary acne underwent a series of treatments using IPL technology to reduce skin eruptions. Results: The study subject was a 22-year-old patient who had been suffering from acne vulgaris for several years. The skin on her face exhibited changes in the form of pustules, blackheads, and lumps. The entire treatment series was 10 weeks. Prior to the procedure, a very thorough interview was conducted, during which all contraindications were excluded. The Hellgren-Vincent scale, which is used to determine the severity of acne lesions, accurately determines the amount of skin lesions in the form of lumps, pustules, and blackheads. Conclusions: As demonstrated by this study, IPL technology has been beneficial for the condition of the patient’s skin. Pictures from before and after unambiguously indicate the positive effect of intense pulsed light. There has been great improvement in the skin’s overall condition, with reduced acne lesions (lumps, pustules, blackheads).
    Źródło:
    Medical Science Pulse; 2018, 12, 2
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A complexity efficient PAPR reduction scheme for FBMC-based VLC systems
    Autorzy:
    Roshdy, Radwa A.
    Hussein, Aziza I.
    Mabrook, Mohamed M.
    Salem, Mohammed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2204164.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    visible light communication
    filter bank multicarrier
    peak-to-average power ratio reduction
    computational complexity
    cube satellite communication link
    inter-satellite communications
    Opis:
    Visible light communication based on a filter bank multicarrier holds enormous promise for optical wireless communication systems, due to its high-speed and unlicensed spectrum. Moreover, visible light communication techniques greatly impact communication links for small satellites like cube satellites, and pico/nano satellites, in addition to inter-satellite communications between different satellite types in different orbits. However, the transmitted visible signal via the filter bank multicarrier has a high amount of peak-to-average power ratio, which results in severe distortion for a light emitting diode output. In this work, a scheme for enhancing the peak-to-average power ratio reduction amount is proposed. First, an algorithm based on generating two candidates signals with different peak-to- average power ratio is suggested. The signal with the lowest ratio is selected and transmitted. Second, an alternate direct current-biased approach, which is referred to as the addition reversed method, is put forth to transform transmitted signal bipolar values into actual unipolar ones. The performance is assessed through a cumulative distribution function of peak-to-average power ratio, bit error rate, power spectral density, and computational complexity. The simulation results show that, compared to other schemes in literature, the proposed scheme attains a great peak-to-average power ratio reduction and improves the bit the error rate performance with minimum complexity overhead. The proposed approach achieved about 5 dB reduction amount compared to companding technique, 5.5 dB compared to discrete cosine transform precoding, and 8 dB compared to conventional direct current bias of an optical filter bank multicarrier. Thus, the proposed scheme reduces the complexity overhead by 15.7% and 55.55% over discrete cosine transform and companding techniques, respectively.
    Źródło:
    Opto-Electronics Review; 2023, 31, 1; art. no. e144919
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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