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    Wyświetlanie 1-7 z 7
    Tytuł:
    Pool boiling of nanofluids on rough and porous coated tubes: experimental and correlation
    Autorzy:
    Cieśliński, J. T.
    Kaczmarczyk, T. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240179.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pool boiling
    nanofluids
    correlation equation
    rough and porous coated tubes
    wrzenie w objętości
    nanopłyny
    równanie korelacyjne
    rury z powłoką porowatą
    Opis:
    The paper deals with pool boiling of water-Al2O3 and water-Cu nanofluids on rough and porous coated horizontal tubes. Commercially available stainless steel tubes having 10 mm outside diameter and 0.6 mm wall thickness were used to fabricate the test heater. The tube surface was roughed with emery paper 360 or polished with abrasive compound. Aluminium porous coatings of 0.15 mm thick with porosity of about 40% were produced by plasma spraying. The experiments were conducted under different absolute operating pressures, i.e., 200, 100, and 10 kPa. Nanoparticles were tested at the concentration of 0.01, 0.1, and 1% by weight. Ultrasonic vibration was used in order to stabilize the dispersion of the nanoparticles. It was observed that independent of operating pressure and roughness of the stainless steel tubes addition of even small amount of nanoparticles augments heat transfer in comparison to boiling of distilled water. Contrary to rough tubes boiling heat transfer coefficient of tested nanofluids on porous coated tubes was lower compared to that for distilled water while boiling on porous coated tubes. A correlation equation for prediction of the average heat transfer coefficient during boiling of nanofluids on smooth, rough and porous coated tubes is proposed. The correlation includes all tested variables in dimensionless form and is valid for low heat flux, i.e., below 100 kW/m2.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 2; 3-20
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared and NMR spectral Hammett correlations in 4-(2-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines
    Autorzy:
    Thirunarayanan, G.
    Pazhamalai, S.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/411654.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxazine-2-amines
    IR and NMR spectra
    Hammett equation
    Correlation analysis
    Opis:
    A series containing ten titled compounds have been synthesised and recorded the IR and NMR spectra. From the spectra the infrared νNH, C=N, C-O-C stretches, NMR chemical shifts of (δ, ppm) NH and C=N were assigned and correlated with Hammett substituent constants, F and R parameters using single regression analysis. From the results, the effects of substituent on the above spectral frequencies were discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 8; 38-46
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of COVID-19 coronavirus pandemic on international oil markets
    Autorzy:
    Tvalchrelidze, Alexander G.
    Silagadze, Avtandil
    Powiązania:
    https://bibliotekanauki.pl/articles/1819138.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    COVID-19
    coronavirus
    pandemic
    oil price
    tanker
    correlation
    regression equation
    mortality rate
    Opis:
    At the beginning of the COVID-19 coronavirus global pandemic, the oil market was crushed. In this period, the oil market was correlated with COVID-19 coronavirus world infection cases: more infected cases resulted in low oil prices, and the negative correlation between these two indices was very strong. Different factors determined the increase in both crude oil price and the number of oil futures contracts after April 20. Firstly, oil prices were driven by the coronavirus mortality rate, rather than by the absolute number of infection cases. The decisive driver for oil prices in the medium-term became pandemic development trends, instead of the actual epidemiological situation. This statement is proven by the statistical regression model of the interdependence between oil prices and COVID-19 coronavirus world mortality rate. Secondly, a gradual stable decrease in the coronavirus world mortality rate created an environment for the gradual restart of the world economy. Thirdly, the coronavirus mortality rate analysis provides investors with tangible guidelines to assess the medium-term sustainability of futures markets and, therefore, to elaborate investment strategies. Fourthly, after April 20, the oil market gradually achieved equilibrium, which is proven by a restored correlation between oil prices and the Euro-to-U.S. Dollar exchange rate. Three-month tendencies provide tangible guidelines for an optimistic forecast of the oil the market and maritime tanker business for the end of 2020 and all of 2021. So long as a new wave of COVID-19 does not dramatically increase mortality rates, the oil and maritime tanker trade market will regain the equilibrium it lost at the end of January
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 63 (135); 97-103
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared and ¹³C NMR spectral studies of some aryl hydrazides: Assessment of substituent effects
    Autorzy:
    Thirunarayanan, G.
    Sekar, G. K.
    Lakshmi Narayanan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/412577.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted aryl benzohydrazide
    IR spectra
    NMR spectra
    hammett equation
    substituent constants
    correlation analysis
    Opis:
    A series of some aryl hydrazides have been synthesized. These hydrazides purities were analyzed by physical constants and spectral data. The assigned spectral group frequencies were correlated with Hammett substituent constants and Swain-Lupton parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the spectral group frequencies has been discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 88-94
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining of correlation relationship between roll, pitch, and yaw for UAVs
    Autorzy:
    Hlotov, Volodymyr
    Hunina, Alla
    Yurkiv, Mariana
    Siejka, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/106717.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Warszawska. Wydział Geodezji i Kartografii
    Tematy:
    unmanned aerial vehicle
    correlation
    roll
    pitch
    yaw
    regression equation
    bezzałogowy statek powietrzny
    korelacja
    ślizg
    kąt natarcia
    pochylenie
    równanie regresji
    Opis:
    Currently, UAVs are intensively being introduced into topographic-photogrammetric production for topographic digital aerial photography and laser scanning. These technologies have a number of advantages: they don’t require specially prepared platforms and launchers, they are relatively inexpensive unlike large aircrafts, and they are safe. However, there are still many unsolved problems for ultralight UAVs, especially when the aerial photography is made. As you know, the requirements for the implementation of the aerial survey process are quite stringent, first of all, for horizontal flight: the angles of inclination must be within 3–5 degrees, since exceeding these tolerances significantly affects the accuracy for determining the spatial coordinates of objects. Therefore, there was an idea to conduct researches of dependences between the pitch α, roll ω and yaw κ. For this purpose, 100 images obtained from aircraft-type UAV ‘Arrow’ developed and created by specialists from Lviv Polytechnic National University and ‘Abris’ were used. As a result of the study, the multiple correlation coefficient and the parameters of the linear regression equation for the angular elements of the exterior orientation of digital images were calculated. In addition, statistical quality evaluations for the obtained regression model were carried out. Analysis of the received data allows to assert that angular elements of exterior orientation are correlated with each other. Therefore, in the further imaging materials, processing it becomes possible to make compensation of this fact and to improve calculation accuracy of spatial coordinates of points.
    Źródło:
    Reports on Geodesy and Geoinformatics; 2019, 107; 13-18
    2391-8365
    2391-8152
    Pojawia się w:
    Reports on Geodesy and Geoinformatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral Quantitative Structure activity relationships in 3-(substituted phenyl) bicyclo[2.2.1]hept-5-en-2-yl-(pyrene-1-yl) methanone derivatives
    Autorzy:
    Thirunarayanan, Ganesamoorthy
    Powiązania:
    https://bibliotekanauki.pl/articles/1191973.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    2
    3-Diarylbicyclo[2.2.1]-hept-5-ene-2-yl methanones; Greener synthesis
    Correlation analysis
    Hammett equation
    IR and NMR spectra
    QSAR study
    Opis:
    About nine titled compounds were synthesized by greener method and the purities of these methanones have been examined using their analytical and spectral data reported in literature. The infrared and NMR spectral data of these methanones were assigned and correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analyses, the effects of substituents in terms of spectral quantitative structure activity on the spectral frequencies were studied.
    Źródło:
    World Scientific News; 2016, 50; 74-94
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption kinetics of fluoride on bone char and its regeneration
    Autorzy:
    Hu, J.
    Wu, D.
    Rao, R.
    Liu, R.
    Lai, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/206892.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chlorine compounds
    fluorine compounds
    ions
    sodium compounds
    sulfur compounds
    adsorption kinetics
    chemical reaction equilibrium
    correlation coefficient
    Freundlich equation
    optimal conditions
    layered double hydroxides
    aqueous-solution
    drinking water
    equilibrium
    adsorbent
    związki chloru
    związki fluoru
    jod
    związki sodu
    związki siarki
    kinetyka adsorpcji
    równowaga reakcji chemicznej
    współczynnik korelacji
    równanie Freundlicha
    woda pitna
    równanie Langmuira
    Opis:
    The adsorbent of bone char (BC), produced from the pyrolysis of crushed animal bones, was dominated by the mesopores of the Brunauer Emmett Teller (BET) surface area. The optimal condition for defluoridation with BC was a pH level near 5.0. Chloride and nitrate ions could increase fluoride adsorption capacity in contrast with the effect of sulfate and carbonate ions. The interchangeability between fluoride and hydroxyl groups on BC sorbent was proved by the Fourier transform infrared spectroscopy. Langmuir equation had a better correlation coefficient than the Freundlich equation at various temperatures. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees, Ea and S*, have been calculated to describe the nature of fluoride adsorption onto BC. Negative Delta G degrees and Delta H degrees values at various temperatures indicate a spontaneous process, and its exothermic effect, respectively. However, a positive Delta S degrees value represents an increasing process for entropy. The E-a and S* values ranging from 5 to 40 kj.mol-1 and 0 to 1, respectively, demonstrated that the adsorption is dominated by physical process, although the adsorption kinetic process was involved external diffusion, intraparticle diffusion and chemical reaction equilibrium stage. A high concentration of NaOH solution increases efficiency of removing adsorbed F- ions from the BC surface.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 93-112
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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