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    Wyświetlanie 1-11 z 11
    Tytuł:
    Climate response of Salix oritrepha growth along a latitudinal gradient on the northeastern Tibetan Plateau
    Autorzy:
    Lu, X.
    Sigdel, S.R.
    Dawadi, B.
    Wang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077745.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    shrub
    radial growth
    climate sensitivity
    dendrochronology
    summer temperature
    Opis:
    Shrubs are widespread at higher altitudes and latitudes. Dendrochronology of shrub growth has been intensively studied in the circumpolar Arctic, Mediterranean and Patagonia. However, relatively little is known about shrub growth responses to climate change on the Tibetan Plateau. Herein, we investigate climate sensitivity of Salix oritrepha growth along a north–south (35–39° N) latitudinal gradient on the north- eastern Tibetan Plateau. Four S. oritrepha shrub sites were selected for dendrochronology study. Pearson and partial correlation analyses were used to estimate strength of the climate sensitivity of the growth time series at each site. We found that not all of the site chronologies show consistent variations. Despite of this, its ra- dial growth was primarily limited by the July mean temperature across the latitudinal gradient, and warming summer climate tends to increase the growth of S. oritrepha on the northeastern Tibetan Plateau.
    Źródło:
    Dendrobiology; 2019, 81; 14-21
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Temperature Sensitivity Coefficients of a Deterred Spherical Single Base Gun Propellant
    Autorzy:
    Boulkadid, K.
    Lefebvre, M. H.
    Jeunieau, L.
    Dejeaifve, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/358203.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    initial temperature
    temperature sensitivity coefficient
    deterred propellant
    closed vessel tests
    infrared microscopy
    Opis:
    In our previous investigation, we measured the global temperature sensitivity coefficient of a deterred spherical single base gun propellant following an experimental procedure that did not allows us to determine the local temperature sensitivity coefficients of the deterred and undeterred parts of the investigated propellant. In this paper, we propose an experimental methodology to measure the local temperature sensitivity coefficients of both parts of the spherical deterred gun propellant. This methodology can be summarized as follows: Firstly, we separated the ranges of pressure where the combustion of the deterred and the undeterred parts of the spherical propellant occurs by means of infrared (IR) microscopy measurements. Then the burning rate of the propellant as a function of pressure was calculated according to STANAG 4115 at different initial temperatures. Finally, we determined the local temperature sensitivity coefficients of each part of the spherical propellant.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 4; 952-965
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New coupled atmosphere-ocean-ice system COSMO-CLM/NEMO: assessing air temperature sensitivity over the North and Baltic Seas
    Autorzy:
    Van Pham, T.
    Brauch, J.
    Dieterich, C.
    Frueh, B.
    Ahrens, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/48930.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coupled atmosphere-ocean-ice system
    temperature sensitivity
    air temperature
    Baltic Sea
    North Sea
    regional climate modelling
    COSMO-CLM model
    Źródło:
    Oceanologia; 2014, 56, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of a fibre optic strain sensor in the configuration of a Mach-Zehnder modal interferometer with a polarization maintaining photonic crystal fibre
    Autorzy:
    Kaczmarek, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/221393.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photonic crystal fibre
    modal interferometer
    temperature sensitivity
    Opis:
    The paper presents the properties of a strain sensor, which was made using the micro hole collapse method and operates in the configuration of a Mach-Zehnder modal interferometer with a PM-1550-01 polarization maintaining photonic crystal fibre. The sensor’s transfer curve was determined analytically. Its strain sensitivity, determined from measurements, decreases slightly with increasing wavelength and is in a range from -2.01 to -2.23 pm/με in the wavelength range 1520-1580 nm. Based on the Fourier analysis of the wavelength spectrum of the constructed sensor, the difference of the group refractive indices of the core and the cladding of the photonic crystal fibre was determined, which are in a range from 7.45·10-3 to 1.01·10-2. The temperature sensitivity of the sensor, determined on the basis of measurements performed in a range from 23 to 60°C, is positive and equals 5.9 pm/K.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 2; 417-424
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum dots for temperature sensing
    Autorzy:
    Doskaliuk, Natalia
    Lukan, Yuliana
    Khalavka, Yuriy
    Powiązania:
    https://bibliotekanauki.pl/articles/35139207.pdf
    Data publikacji:
    2023
    Wydawca:
    Radomskie Towarzystwo Naukowe
    Tematy:
    quantum dots
    photoluminescence
    thermal sensing
    temperature sensitivity
    II-VI semiconductors
    I-III-VI semiconductors
    CdTe
    CdS
    PbS
    AgInS2
    CuInS2
    kropki kwantowe
    fotoluminescencja
    detekcja ciepła
    wrażliwość termiczna
    półprzewodniki II-VI
    półprzewodniki I-III-VI
    Opis:
    Quantum dots are three-dimensional nanoparticles of semiconductors with typical sizes ranging from 2 to 10 nm. Due to the quantum confinement effect the energy gap increase with the size decreasing resulting in size-depended and fine-tunable optical characteristics. Besides this, the energy structure of a quantum dot with a certain size is highly sensitive to environmental conditions. These specific properties open a wide range of applications starting from optical and optoelectronic devices and ending with biosensing and life science. Temperature is one of those parameters influencing strongly on the optical properties of semiconductor nanocrystals, which make them promising materials for temperature sensing, more often using a fluorescent response. Compared to the conventional organic dyes already applied in this field, quantum dots exhibit a set of advantages, such as high quantum yield and photostability, long fluorescence lifetime, higher Stokes shift, and ability to surface functionalization with targeted organic molecules aimed to provide them biocompatibility. In this review, we briefly discuss the properties of II-VI and assumingly less toxic I-III-VI quantum dots, mechanisms of temperature-induced fluorescence response, and the feasibility of their practical application in the field of thermal sensing.
    Źródło:
    Scientiae Radices; 2023, 2, 2; 93-111
    2956-4808
    Pojawia się w:
    Scientiae Radices
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of ‘Monika’ Cucumis sativus seedlings to low temperature and induction of chilling tolerance
    Autorzy:
    Górnik, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2199620.pdf
    Data publikacji:
    2015-06-20
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    chilling sensitivity
    cucumber
    thermal shock
    temperature stress
    chilling resistance
    Opis:
    The aim of the research was to investigate the chilling sensitivity of cucumber seedlings and to alleviate its negative effects by short-term shock temperature applied during seeds imbibition, before radicle protrusion. The chilling sensitivity was investigated depending on initial root length (1, 3, 5 and 7 mm) and duration of chilling exposure (0, 1, 3, 7, 14, 21 days) at 0˘C and was evaluated by measurements of roots and hypocotyls growth, electrolyte leakage and dehydrogenases activity. To assess whether short-term shock temperature applied before radicle protrusion can increase chilling tolerance in cucumber seedlings the seeds were imbibed at 25°C for 16 h, exposed to temperatures of 0; 2,5; 5; 35; 40, 45°C for 0; 0,5; 1; 2; 4 h. The obtained results indicated that cucumber seedlings sensitivity depended on duration of chilling exposure and initial root length during which the seedlings were subjected to these conditions. Chilling sensitivity were manifested by drop in the roots and hypocotyls elongation, reduction in dehydrogenases activity and membrane integrity expressed by electrolyte leakage. Seedlings with 1 mm roots was relatively tolerant to 3 days of chilling at 0°C. Their chilling sensitivity increased as roots elongated. Seedling with 3, 5, 7 mm of roots subjected to chilling suffered a subsequent 71, 75 and 81% of growth inhibition, respectively. The presented results showed that a short-term of low (0; 2,5 or 5°C) or high (35; 40 or 45°C) temperature treatments applied before radicle protrusion i.e. after 16 h of seeds imbibition significantly counteracted the negative effects of chilling on seedlings. The best results expressed by increased length and the number of roots were obtained when imbibed seeds were exposed to 45°C for 2 and 4 h. The increased chilling tolerance of cucumber seedlings induced as early as at the stage of seed imbibition, before radicle protrusion indicates on the possibility of application of this method in practice. The positive response of such treatment on cucumber chilling tolerance are discussed.
    Źródło:
    Plant Breeding and Seed Science; 2015, 71; 3-11
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of Temperature Field to Material Parameters within the Clothing Laminate Process
    Wrażliwość pola temperatury na parametry materiałowe w procesie laminowania odzieży
    Autorzy:
    Korycki, R
    Szafrańska, H
    Powiązania:
    https://bibliotekanauki.pl/articles/231943.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    sensitivity
    temperature field
    clothing laminates
    wrażliwość pola temperatury
    laminowanie odzieży
    laminat włókienniczy
    parametry materiałowe
    Opis:
    Textile laminate is created by introducing a thermoplastic polymer between the inner layer and outer material, which is then softened by heat. The connection is secured by adhesive properties of the polymer and the pressure applied after the heating zone. The state variables are defined as thus: the temperature of the heating zone and the pressure of rollers for the pressure system. The heat problem is described by the heat transport equation as well as the boundary and initial conditions. The distributions of the mean temperature within the polymer layer can be determined by numerical simulation. The sensitivity of the temperature field to the selected material parameters within clothing laminates is determined.
    Laminat włókienniczy jest tworzony przez termoplastyczny polimer zmiękczany cieplnie, wprowadzany między wkład odzieżowy i materiał zewnętrzny. Połączenie jest tworzone dzięki właściwościom adhezyjnym polimeru oraz naciskowi przykładanemu poza strefą nagrzewania. Zmienne stanu to temperatura dla strefy nagrzewania oraz nacisk wałków systemu dociskowego. Problem cieplny jest opisany przez równanie transportu ciepła oraz warunki brzegowe i początkowe. Rozkład średniej temperatury w warstwie polimeru może zostać określony poprzez symulacje numeryczne. Została wyznaczona wrażliwość pola temperatury w laminatach odzieżowych na wybrane parametry materiałowe.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 5 (107); 83-88
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of Tilia cordata seeds to dehydration and temperature of liquid nitrogen
    Autorzy:
    Chmielarz, P
    Powiązania:
    https://bibliotekanauki.pl/articles/41625.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    dehydration
    drying
    liquid nitrogen
    temperature
    Tilia cordata
    forest habitat
    sensitivity
    scarification
    cryopreservation
    seed
    Opis:
    The aim of the study was to assess the susceptibility of small-leaved lime (Tilia cordata Mill.) seeds to drying and freezing in liquid nitrogen (-196°C). Seed samples were frozen in liquid nitrogen for 24 h at 11 different levels of seed moisture content (m.c.), ranging from 3.1% to 22.8% (fresh weight basis). All samples, including unfrozen control samples, were subjected to scarification with concentrated sulphuric acid (Tylkowski 1998) either before or after freezing. Seed pre-treatment before germination (at 3~15°C/16~8h) involved cold stratification at 3°C without substrate. Seed drying to 3.1% m.c. significantly reduced their germinability (to 63%), as compared to the high germinability (82-88%) of seeds with 5.2-20.9% m.c. Thus seeds of this species can be assigned to the ‘suborthodox' category. Such a high germinability (79-87%) was preserved after freezing in liquid nitrogen in samples dried to 9.0-17.4% m.c. if scarification was performed before freezing, and in samples dried to 9.1-16.2% m.c. if scarification was performed after freezing. The highest percentage of seedlings emerged after freezing in liquid nitrogen from seeds dried to 11.1-20.1% m.c. (emergence 65-75%) if scarification was performed before freezing, and from seeds dried to 7.3-17.8% m.c. (emergence 53%-71%) if scarification was performed after freezing.
    Źródło:
    Dendrobiology; 2002, 47 Supplement
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Sensitivity of Propellant Combustion and Temperature Coefficients of Gun Performance
    Autorzy:
    Boulkadid, M. K.
    Lefebvre, M. H.
    Jeunieau, L.
    Dejeaifve, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/358071.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    firing temperature
    temperature sensitivity
    temperature coefficient
    ball propellant
    ageing
    ballistic firing
    closed vessel tests
    Opis:
    One of the objectives of gun propellant research is to develop green formulations of gunpowder that should be less temperature sensitive than the current gun propellant. The temperature sensitivity of these new green formulations of the propellant should be measured to identify the less temperature sensitive green formulations. However, there are deficiencies in the methodologies for the measurement of the temperature sensitivity of gun propellants. Therefore, the aim of this investigation was to fill the gap by establishing a method for the measurement of the temperature sensitivity of deterred gun propellants by closed vessel tests. The temperature sensitivity of the burning rate of ball propellants and the temperature coefficients of gun performance were determined using closed vessel tests and ballistic firing, respectively. Specific definitions of temperature sensitivity and temperature coefficients were evaluated. The relation between these parameters has never been explicitly investigated previously. Assessing the temperature sensitivity of propellants by closed vessel tests is of added value to the range of ballistic tests if the results of these tests can be well correlated to the results of ballistic firings. Therefore, a comparison between both parameters was made. A correspondence has been observed between the temperature sensitivity of the propellant burning rate, as obtained from closed vessel tests, and the temperature coefficients as obtained from ballistic firings.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 4; 1005-1022
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature sensitivity of solid heterogeneous rocket propellant AP/HTPB/AI
    Wrażliwość temperaturowa stałego heterogenicznego paliwa rakietowego AP/HTPB/Al
    Autorzy:
    Florczak, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/1063113.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    solid heterogeneous rocket propellant
    HTPB
    laboratory rocket motor
    temperature sensitivity
    stałe heterogeniczne paliwa rakietowe
    laboratoryjny silnik rakietowy
    wrażliwość termiczna
    Opis:
    Przedstawiono wyniki z badań stałego heterogenicznego paliwa rakietowego (SHPR) zawierającego jako główne składniki: chloran(VII) amonu (AP) jako utleniacz, lepiszcze na bazie ciekłego syntetycznego kauczuku (HTPB), glin (Al) oraz dodatki technologiczne w laboratoryjnym silniku rakietowym (LSR) pozwalające na wyznaczenie wrażliwości termicznej paliwa.
    Źródło:
    Materiały Wysokoenergetyczne; 2019, 11, 2; 83-88
    2083-0165
    Pojawia się w:
    Materiały Wysokoenergetyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing metals in tension and relaxation at elevated temperatures
    Autorzy:
    Darrieulat, M.
    Aoufi, A.
    Desrayaud, CH.
    Powiązania:
    https://bibliotekanauki.pl/articles/38695715.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    tension testing
    viscoplasticity
    work hardening
    engineering strain
    extensometer
    relaxation test
    strain rate sensitivity
    elevated temperature
    Opis:
    This article describes an apparatus for testing viscoplastic metallic alloys in tension at temperatures up to 400ºC. Its distinctive feature is a two-shelled furnace which encompasses the test-piece. The extensometer is attached to the shoulders of the specimen and remains outside the oven, so that it works at room temperature. The strain εrs in the reduced section inside the tight fitting oven is calculated with the help of a finite element software from the strain εext given by the extensometer. In the elastic range, the set-up was used for the measurement of Young’s moduli. In the plastic and viscoplastic ranges, it was used to draw work-hardening curves and to perform relaxation tests representative of in-service conditions. In this later case, a method to derive the strain rate sensitivity from the decrease with time of the registered stress is presented. The furnace can be easily machined in a mechanical workshop for all shapes and dimensions of test-pieces, so that it can be adapted to various studies of the workability of metallic alloys, especially those which necessitate a rapid rise and precise maintenance in temperature.
    Źródło:
    Archives of Mechanics; 2023, 75, 1-2; 75-106
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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