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Wyszukujesz frazę "illumination" wg kryterium: Temat


Wyświetlanie 1-8 z 8
Tytuł:
Small lighting luminaires for illumination applications
Autorzy:
Różowicz, Tadeusz
Wachta, Henryk
Różowicz, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/2172806.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computer visualization
illumination
LED light sources
luminance distribution
Opis:
The application of solid-state light sources in luminaires creates a new quality in illumination design works. In a confrontation with a commonly used but relatively unattractive flood method, the use of small-size luminaires allows one to present an illuminated architectural object in a more attractive way in the evening and at night. In this case, it is possible to apply the principles of illumination described in the literature, especially the principle of height amplification and the principle of depth amplification. The conceptual work of illumination with the use of a large number of small-size luminaires does not require the use of supporting graphical tools, but the specification of actual lighting equipment using only polygonal samples in this case is not possible. The paper presents selected issues of the key stages of the completed work. Using specialized computer software, a geometric model of the architectural object has been developed, facade materials have been parameterized, models of small-size illuminating equipment have been selected and, finally, calculations of luminance distribution on illuminated surfaces have been carried out. As a result of computer work, luminance distributions and photorealistic visualizations of illuminations from defined main directions of observation were obtained. The Lubomirski Palace in Przemysl is an example of the architectural object indicated for detailed works.
Źródło:
Archives of Electrical Engineering; 2022, 71, 4; 1035--1050
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of noise in surface topography measurement using structured illumination microscopy
Autorzy:
Li, Zhen
Gröger, Sophie
Powiązania:
https://bibliotekanauki.pl/articles/2052124.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface topography measurement
measurement noise
uncertainty
structured illumination microscopy
Opis:
Noise is a fundamental metrological characteristic of the instrument in surface topography measurement. Therefore, measurement noise should be thoroughly studied in practical measurement to understand instrument performance and optimize measurement strategy. This paper investigates the measurement noise at different measurement settings using structured illumination microscopy. The investigation shows that the measurement noise may scatter significantly among different measurement settings. Eliminating sample tilt, selecting low vertical scanning interval and high exposure time is helpful to reduce the measurement noise. In order to estimate the influence of noise on the measurement, an approach based on metrological characteristics is proposed. The paper provides a practical guide to understanding measurement noise in a wide range of applications.
Źródło:
Metrology and Measurement Systems; 2021, 28, 4; 767-779
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shaping of Panel Materials in Light Direction Design
Autorzy:
Urzędowski, A.
Wójcicka-Migasiuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/354766.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reflective materials
illumination channels
surface shaping
reflection
non-imaging optics
Opis:
Abstract The paper presents the methodology of the analysis of the materials used in solar energy conversion, and an elaborated example with simulations of obtained results. Material properties are selected in relation to the need of sunlight illumination applications in civil constructions. This process is presented , starting from the analysis of some aspects of solar radiation, through the calculations of lens curvature and leading to the execution of simulations in different conditions. Graphical presentation of the phenomenon, it can visualize the process of shaping curves. The materials such as glass, polymers, metals, and gases have been discussed. Particular attention was paid to the results of the transmission of materials, their reflection and absorption of solar radiation. Moreover, the research problems of illumination and reflection in multi-layer structures used for civil constructions have been presented.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 941-945
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of noise in the Monte Carlo point sampling method
Autorzy:
Guzek, K.
Napieralski, P.
Powiązania:
https://bibliotekanauki.pl/articles/202392.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photorealism
image evaluation methods
image quality metrics
visual perception
global illumination
Opis:
This paper gives a concise overview of the techniques we have used to find out the degree of measuring the quality of rendered images and a level of noise in particular. First part of the paper presents designed and conducted psychophysical experiment involving human subjective judgment. Then, two of the existing numerical image comparison methods are considered in the context of assessing the level of noise produced by global illuminations algorithms. The results of the participants’ subjective responses are correlated with the data obtained from objective mathematical metrics. The main goal of research was to determine the objective and perceptual measure of quality for images with fixed sampling strategy. The results will help to establish the measures of identifying the human perception in the assessment of images generated with global illumination algorithms.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 1; 15-19
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of non-measured points on surface measurement using structured illumination microscopy
Autorzy:
Li, Zhen
Gröger, Sophie
Powiązania:
https://bibliotekanauki.pl/articles/2173900.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
non-measured points
structured illumination microscopy
areal surface texture parameters
measurement uncertainty
Opis:
Non-measured points (NMPs) are one of vital problems in optical measurement. The number and location of NMPs affect the obtained surface texture parameters. Therefore, systematic studying of the NMP is meaningful in understanding the instrument performance and optimizing measurement strategies. This paper investigates the influence of measurement settings on the non-measured points ratio (NMPR) using structured illumination microscopy. It is found that using a low magnification lens, high exposure time, high dynamic range (HDR) lighting levels, and low vertical scanning interval may help reduce the NMPR. In addition, an improved approach is proposed to analyze the influence of NMP on areal surface texture parameters. The analysis indicates that the influence of NMP on some parameters cannot be ignored, especially for extreme height parameters and feature parameters.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 763--778
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient rendering of caustics with streamed photon mapping
Autorzy:
Guzek, K.
Napieralski, P.
Powiązania:
https://bibliotekanauki.pl/articles/200625.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rendering
global illumination
photon mapping
caustics
wykonanie
globalne oświetlenie
mapowanie fotonów
kaustyki
Opis:
In this paper, we present the streamed photon mapping method for enhancing the rendering of caustics. In order to achieve a realistic caustic effect, global illumination methods require additional data, which are gathered by creating a caustic map or increasing the number of samples used for rendering. Our method employs a stream of photons with a varying luminance level depending on the material properties of the surface. The application of a concentrated photon stream provides the ability to render caustics effectively without increasing the number of photons in a photon map. Such an approach increases visibility of results, while also allowing for faster computations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 3; 361-368
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the output characteristics of photovoltaic arrays under partial shading conditions based on peak point approximate calculation method
Autorzy:
Wei, Liming
Li, Kaikai
Powiązania:
https://bibliotekanauki.pl/articles/2086691.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
– characteristic equation
peak point approximate calculation method
peak voltage point
shadow occlusion’s rate
type of illumination distribution
Opis:
The mismatch effect of photovoltaic (PV) arrays due to different illumination intensity has a significant impact on the output characteristics and output power of PV arrays, which is crucial to understand the output characteristics of PV arrays and optimize the array configuration in order to improve the value of the maximum power point. This paper illustrates the short-circuit current mismatch of series circuits, and the open-circuit voltage mismatch of parallel circuits and proposes corresponding solutions for each mismatch phenomenon. The output characteristics of multi-stage series PV arrays and multi-stage parallel PV arrays under complex illumination are analyzed by using the peak point approximation calculation method, and the distribution law of peak voltage points as well as the I-V (Current-Voltage) characteristic equation of each operating section are proposed. On this basis, the output characteristics of 3 x 3 centralized PV arrays are analyzed and verified by simulation. By comparing series and parallel PV arrays with the same condition, as well as several groups of centralized PV arrays with the same topology and different types of illumination distribution, this paper proposes a configuration optimization method for PV arrays. Matlab/Simulink simulation results confirm that the output power of parallel arrays is greater than that of series arrays under the same configuration and illuminationt distribution type, and the peak point is less than that of series arrays under the same configuration and lighting conditions; while in centralized PV arrays, the fewer series modules are shaded, the greater the output power and the less the peak point.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 409--424
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Pollution of the Mountain Areas in Poland
Zanieczyszczenie świetlne w obszarach górskich w Polsce
Autorzy:
Ściężor, T.
Kubala, M.
Kaszowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/204891.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
zanieczyszczenia świetlne
sztuczna poświata niebieska
jasność nocnego nieba
źródła światła
obszar chroniony
light pollution
artificial sky glow
light-island
light sources
illumination
Opis:
The existence of extensive records for the impact of night sky brightness on the animals’ behavior in their natural environment shows the need to investigate the level of artificially induced night sky glow (light pollution) in the protected areas. The results of multi-night sky brightness measurements carried out at the selected sites in Polish mountain areas under various atmospheric conditions are presented. Conducted measurements show a strong impact of the artificial sky glow on the night sky brightness, which is the essence of light pollution. The influence of both distant urban centers, as well as local tourist resorts on the size of studied phenomenon in the mountain areas, which causes both ecological and touristic degradation of these areas was stated. In a few studied areas the level of night sky brightness greatly exceeds the natural one and is comparable to such levels measured inside the cities. It was found that only the southern part of the Polish Carpathians can be considered an area free of light pollution.
Istnienie obszernej ewidencji wpływu jasności nocnego nieba na zachowania zwierząt w ich środowisku naturalnym wskazuje na potrzebę zbadania skali zjawiska sztucznie indukowanej poświaty nocnego nieba (zanieczyszczenia świetlnego) w obszarach chronionych. Przedstawiono wyniki wieloletnich pomiarów jasności nocnego nieba, przeprowadzonych w wybranych punktach obszarów górskich Polski w różnych warunkach atmosferycznych. Przeprowadzone pomiary świadczą o wyraźnym wpływie sztucznej poświaty niebieskiej na jasność nocnego nieba, co stanowi istotę zanieczyszczenia świetlnego. Stwierdzono wpływ zarówno dalekich ośrodków miejskich, jak i lokalnych ośrodków turystycznych na wielkość badanego zjawiska w obszarach górskich, co powoduje degradację zarówno pod względem ekologicznym, jak i turystycznym tych terenów. W części badanych obszarów jasność nocnego nieba znacznie przekracza wielkość wywołaną przez zjawiska naturalne i jest porównywalna do wartości mierzonych wewnątrz miast. Stwierdzono, że jedynie południową część Bieszczadów można uznać za obszar wolny od zanieczyszczenia świetlnego.
Źródło:
Archives of Environmental Protection; 2012, 38, 4; 59-69
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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