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    Wyświetlanie 1-10 z 10
    Tytuł:
    Thermal analysis of a two-dimensional array with surface light emission based on nitride EEL lasers
    Autorzy:
    Dąbrówka, Dominika
    Sarzała, Robert P.
    Wasiak, Michał
    Kafar, Anna
    Perlin, Piotr
    Saba, Kiran
    Powiązania:
    https://bibliotekanauki.pl/articles/2174849.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    GaN
    diode laser
    array with surface light emission
    thermal analysis
    Opis:
    This paper presents the results of a thermal computational analysis of a two-dimensional laser array emitting from a surface. The array consisted of eight equispaced ridge-waveguide edge-emitting nitride diode lasers. Surface emission of light was obtained using mirrors inclined at 45°. The authors investigate how the geometrical dimensions of the array emitters and their pitch in the array affect the increase and distribution of temperature in the device. They also examine the influence on the temperature increase and distribution of the thickness of the insulating SiO₂, the thickness of the gold layer forming the top contact of the laser, and the thickness of the GaN substrate, as well as the influence of the ridge-waveguide width.
    Źródło:
    Opto-Electronics Review; 2022, 30, 4; art. no. e144115
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Plasma Parameters on Light Emission in GD-OES Analysis of Ni–Cu System
    Autorzy:
    Nowak, Wojciech J.
    Wierzba, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/175809.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    glow discharge optical emission spectrometry (GD-OES)
    plasma-forming parameters
    plasma sputtering
    light emission
    Opis:
    In the present work, an effect of plasma-forming parameters on light emission during analysis by glow discharge optical emission spectrometry of Ni–Cu model alloys is studied. To evaluate the effects of plasma-forming parameters on light emission, argon pressure was varied in the range between 600 Pa and 1000 Pa under a constant power of 20 W. Moreover, a variation of power at 20 W and 30 W under a constant Ar pressure of 1000 Pa was investigated. An effect of the element content on light emission was found. Namely, for Cu, a monotonic, non-linear increase in measured light intensity with an increasing Cu content was found. Surprisingly, for pure Ni, a lower light intensity was measured as for Ni90–Cu10 (at.%). Possible reasons causing this was listed as: (i) possible effect of hydrogen, (ii) overlapping of lines for Cu and Ni and (iii) self-absorbing of Ni line at 341.574 nm.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 1; 21-27
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Light Pollution of the Night Sky in Toruń (Poland)
    Autorzy:
    Karpińska, Dominika
    Kunz, Mieczysław
    Powiązania:
    https://bibliotekanauki.pl/articles/1838062.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    light pollution
    light emission
    SQM
    Toruń
    Polska
    land cover
    zanieczyszczenie światłem
    emisja światła
    Polska
    analiza jasności nieba
    Opis:
    Light pollution is one of the types of environmental pollution. The sky illuminated by the excessive light emission is an inherent element of the modern world. This phenomenon has been known for over a century, but research has been carried out only for several decades. Analysis of the brightness of the sky was made for Toruń (Poland) and neighboring areas. The main aim of the study was to study the distribution of brightness of the sky over a medium-sized city. The basic research method was a direct measurement of brightness made with the SQM photometer. The conducted research was carried out throughout the calendar year on 24 measurement stations located in Toruń. Measurement stations represented various types of buildings occurring in every city. On the basis of the obtained data, a map was made showing the extent of light pollution and its intensity, as well as the spatial distribution of this phenomenon. The brightness of the sky was also examined in terms of astronomical and weather conditions. Each aspect is documented in tabular and visual form.
    Źródło:
    Civil and Environmental Engineering Reports; 2020, 30, 4; 155--172
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Streamer propagation in a non-uniform electric field under lightning impulse in short gaps insulated with natural ester and mineral oil
    Autorzy:
    Rozga, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/202153.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    natural esters
    mineral oil
    lightning impulse
    streamer propagation
    light emission
    estry naturalne
    olej mineralny
    propagacja
    emisja światła
    Opis:
    This article describes the comparative experimental studies on streamer propagation in natural ester and mineral oil under a high voltage lightning impulse. These studies were concentrated around the small electrode gaps and the point-plane electrode arrangement. The spatial shapes of the developing streamers, light emission and propagation velocity were analyzed and compared between the two different dielectric liquids. In both of them two streamer propagation modes were registered during the studies performed. Propagation of slow 2nd mode streamers took place below the so-called acceleration voltage while fast 3rd mode streamers developed at acceleration voltage and above. Comparing the streamer shapes corresponding to a given voltage polarity, no visible differences were observed between the liquids tested. Concerning the light emission, higher frequencies of light pulses were registered however in the case of natural ester. The significant differences between both liquids were noticed in the value of the acceleration voltage estimated. In the case of positive polarity streamers started to develop in natural ester as a 3rd mode at lower value of testing voltage than in the case of mineral oil. For negative polarity, within the applied testing voltages, 3rd mode streamers appeared only in natural ester. On this basis, the fundamental conclusion is that natural ester may have a lower ability of preventing the development of fast and energetic 3rd mode streamers, even at small electrode gaps.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 171-179
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Publicznoprawne aspekty przeciwdziałania zanieczyszczeniu sztucznym światłem – podstawowe postulaty "de lege ferenda"
    Autorzy:
    Szlachetko, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/48899291.pdf
    Data publikacji:
    2023-04-24
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    artificial light pollution
    public-law aspects of counteracting light pollution
    harmful emission of artificial light
    Opis:
    The paper presents a normative analysis of Polish legislation, along with recommendations for necessary changes that would provide legal instruments to counteract artificial light pollution. The aim is to indicate the regulations essential for limiting the harmful emission of artificial light in key aspects that result from the environmental protection law in connection with provisions on technical standards and requirements. Counteracting light pollution requires not only defining emission standards, but also rational planning that takes into account land use or the function a given area serves. In addition, it is essential that appropriate technical standards be established for the design and installation of outdoor lighting.
    Źródło:
    Studia Iuridica; 2022, 94; 408-425
    0137-4346
    Pojawia się w:
    Studia Iuridica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Miniaturowy krzemowo-szklany mikrocytometr zintegrowany z miniaturowym źródłem światła
    Miniature silicon-glass microcytometer integrated with miniature light source
    Autorzy:
    Cichy, B.
    Górecka-Drzazga, A.
    Dziuban, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/157048.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mikrocytometr
    biochip
    emisja polowa
    polowe źródła światła
    zwierzęce oocyty
    microcytomete
    field emission
    field-emission light sources
    animal oocytes
    Opis:
    W pracy przedstawiono krzemowo-szklany chip mikrofluidyczny tzw. mikrocytometr. Jest to miniaturowe urządzenie do analizy parametrów różnych komórek (przepływającego obiektu biologicznego) wprowadzonych do układu mikrokanałów. Prezentowany mikrocytometr przystosowany jest do wprowadzania światła prostopadle do kierunku przepływu badanej próbki. Do oświetlania próbki opracowano miniaturowe krzemowo-szklane źródło światła. Źródło to wykorzystuje emisję polową elektronów z wielościennych nanorurek węglowych oraz wzbudzanie luminescencji w nanokrystalicznym luminoforze tlenkowym. Ze względu na kompatybilność technologiczną obu miniaturowych urządzeń jest możliwa ich pełna integracja. Opracowany chip został zastosowany do analizy właściwości pojedynczych komórek zwierzęcych metodą pomiaru wzbudzonej fluorescencji. Wstępne testy wykazały, że krzemowo-szklany mikrocytometr umożliwia ocenę stanu biologicznego oocytów zwierzęcych poddanych indukowanej apoptozie.
    A new silicon-glass microfluidic chip called microcytometer is presented in the paper. It is a miniature device for examining parameters of microscopic particles, such as cells which are suspended in a stream of fluid flowing by microchannel. This chip allows introduction of light beam vertically to the sample flow direction. Miniature light source for lighting the analysed cell was elaborated. The light source makes use of electron emission for cold cathode as an effect of a very high electrical field. Field-emitted electrons from multiwall carbon nanotubes excite luminescence from nanocrystalline oxide phosphors. Because of technological compatibility of both miniature devices, they can be fully integrated. The microcytometer was used for fluorimetric measurements of single living, animal cells. The first results showed that the silicon-glass microcytometer allowed estimation of biological conditions of animal oocytes which were subjected to induced apoptosis.
    Źródło:
    Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 437-439
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field-emission light sources for lab-on-a-chip microdevices
    Autorzy:
    Górecka-Drzazga, A.
    Cichy, B.
    Szczepańska, P.
    Walczak, R.
    Dziuban, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201010.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lab-on-a-chip
    field emission
    light source
    microcytometer
    Opis:
    Microfluidic devices called lab-on-a-chips utilize two kinds of characterization of a biosample, which are based on spectrofluorimetric and spectrophotometric methodologies. Lab-on-a-chips are equipped with an optical instrumentation and a software system that allow detecting of the optical signals and their processing into spectral characteristics. In the paper, technology of lab-on-a-chip (cytometer microdevice) and miniature silicon-glass field-emission light source (FELS) is described. Electrons emitted from a silicon cathode covered with carbon nanotubes excite light emission from nanocrystalline rare earth doped yttrium oxide phosphor (anode). The emitted light can be precisely tailored to the main absorption line of a fluorescent marker. The presented system has been successfully used for testing of the cow embryos as well as fluorescent-marked porcine oocytes.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 13-17
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of a weak ion beam treatment of emission layer on the top emission polymer light-emitting diode
    Autorzy:
    Gong, T
    Gwag, J S
    Powiązania:
    https://bibliotekanauki.pl/articles/174367.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    organic light emitting diode
    light-emitting polymer
    top emission
    optical device
    ion beam
    surface treatment
    Opis:
    This study examined the influence of a weakly treated emission layer on ion beam processing for the performance of top emission polymer light-emitting diodes with an invert structure (top ITO as the anode). The emission layer used in this experiment was a polymer type SY, Livilux PDY-132 provided by Merck & Co. The surface of the emission layer was modified by a low energy ion beam treatment to obtain hydrophilic functional groups and improve the wettability. As a hole transfer layer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS, CLEVIOS AI 4083, Heraeus) was spin-coated on the ion beam treated emission layer and showed good adhesion properties. Consequently, through such an ion beam treatment that promotes the interface properties of these two layers, a uniform light emitting area was obtained and the light intensity in a top emission polymer light-emitting diode was improved.
    Źródło:
    Optica Applicata; 2014, 44, 4; 567-574
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Durability and wear of engine parts – new methods of testing of alloys and composites
    Autorzy:
    Ranachowski, Z.
    Pawełek, A.
    Jasieński, Z.
    Piątkowski, A.
    Kudela Jr., S.
    Lewandowski, M.
    Mazuruk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/360606.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    Diesel engines diagnostics
    light alloys and composites
    Common Rail fuel system
    Acoustic Emission method
    Opis:
    The paper deals with the problems related to the diagnostics of selected parts of modern Diesel engines. The evolution of mechanical properties of four alloys of Mg-Li-Al system and four composites made on the base of the alloys mentioned above, caused by variation of its composition was presented. The Acoustic Emission (AE) method applied to monitoring of degradation of mechanical properties of the alloys and composites was described. Moreover, the results of the investigation of failures occurring in the injectors of Common Rail Diesel engines performed with the application of AE method were also reported.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 125-131
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trends in automotive emissions, fuels, lubricants, legislation and test methods –a global view, with a focus on the EU & US – summary of the 5th International Exhaust Emissions Symposium (IEES)
    Autorzy:
    Bielaczyc, P.
    Woodburn, J.
    Gandyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/132954.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    exhaust emissions
    emission standards
    RDE
    Real Driving Emissions
    WLTP
    Worldwide harmonized Light vehicles Test Procedures
    WLTC
    biofuel
    exhaust aftertreatment systems
    fuel
    lubricant
    emisja spalin
    standardy emisji
    rzeczywista emisja cząstek
    biopaliwa
    system oczyszczania spalin
    paliwo
    olej
    Opis:
    The field of vehicular exhaust emissions is experiencing wide-ranging and rapid changes. Air quality is very high on the political agenda and pressure remains to limit and reduce greenhouse gas emissions from the road transport sector. In addition to limits being increasingly stringent, the list of parameters subject to legal limits are slowly expanding – and, most importantly, these limits must be met under a wide wide range of conditions. A range of strategies are available to overcome these difficulties, which was explored during the 5th International Exhaust Emissions Symposium (IEES) hosted at BOSMAL in May 2016. This paper reports and summarises the topics of the 5th IEES and attempts a synthesis on the current status of the field and what the coming years may hold for the automotive and fuel industries and other allied fields.
    Źródło:
    Combustion Engines; 2016, 55, 3; 76-82
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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