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Wyszukujesz frazę "acoustical parameters" wg kryterium: Temat

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Triazolo derivatives: Synthesis and ultrasonic behaviour in DMF and DMSO solutions over a wide range of temperatures
    Autorzy:
    Baluja, Shipra
    Pithiya, Mona
    Hirapara, Asmita
    Lava, Divyata
    Powiązania:
    https://bibliotekanauki.pl/articles/1158749.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    DMF
    DMSO
    Triazole
    acoustical parameters
    ultrasonic velocity
    Opis:
    Ultrasonic velocity, density and viscosity of two new triazolo derivatives were measured in DMF and DMSO over a range of temperatures. From these measured experimental data, various acoustical parameters were calculated to understand the molecular interactions occurring in the solution.
    Źródło:
    World Scientific News; 2018, 114; 177-194
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical studies of some derivatives of 1,5-benzodiazepines at 298.15 K
    Autorzy:
    Baluja, S.
    Godvani, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/411868.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    benzodiazepine derivatives
    ultrasonic Study
    acoustical parameters
    DMF
    THF
    Opis:
    Some new derivatives of 1,5-Benzodiazepines have been synthesized and their structural characterizations are done by IR, NMR and Mass Spectral data. The ultrasonic velocity, density and viscosity of these synthesized compounds have been measured in dimethyl formamide and tetrahydrofuran at 298.15 K. From these experimental data, some acoustical parameters such as isentropic compressibility, intermolecular free path length, Rao’s molar sound function, relaxation strength, solvation number etc., have been calculated which helps in understanding the molecular interactions occurring in these solutions.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 19, 2; 132-142
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chenodeoxycholic acid: A Physicochemical study
    Autorzy:
    Baluja, Shipra
    Bhesaniya, Kapil
    Powiązania:
    https://bibliotekanauki.pl/articles/1193963.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Chenodeoxycholic acid
    Dissociation constant
    acoustical parameters
    thermal analysis
    Opis:
    Some physicochemical properties such as dissociation constant, acoustical parameters and thermal studies of acid are studied in methanol and 1,4-dioxane at 298.15 K. The dissociation constant of Chenodeoxycholic acid is evaluated in binary mixtures (of methanol / 1,4-dioxane + water) by two methods; half-integral and average methods. The acoustical properties have been evaluated from experimental data of density, viscosity and ultrasonic velocity. It is observed that in both the solvents, strong solute-solvent interactions exist. Thermal degradation of Chenodeoxycholic acid is found to be a single step process.
    Źródło:
    World Scientific News; 2015, 18; 115-127
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical studies of some synthesized Schiff base derivatives in dimethylsulphoxide at 303.15 K, by ultrasonic velocity measurement
    Autorzy:
    Gopi, C.
    Santhi, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/412151.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    density
    viscosity
    ultrasonic velocity
    DMSO
    acoustical parameters
    molecular interactions
    Opis:
    The density, viscosity and sound velocity of five Schiff bases (1-5) derivatives in DMSO solutions have been studied at 303.15 K over a wide range of concentration. From these experimental data, some acoustical parameters such as Molar volume (Vm), Specific Acoustic Impedance (Z), Adiabatic compressibility (βad), Intermolecular Free Length (Lf), Rao’s Constant (R), Molar compressibility (W), Relaxation time(τ), van der Waals constant (b), Relaxation strength (r), Relative association (RA), Isothermal compressibility (βT ) , Isothermal expansion co-efficient (α) ,Free volume (Vf) and Internal pressure (πi) and Ultrasonic attenuation (α/f²) have been evaluated. A fairly good correlation between a given parameter and concentration is observed. The results are interpreted in terms of molecular interactions like solvent-solvent, solvent-solute and solute-solute interactions.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 17, 1; 50-66
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Characterization of a Room : Study Case Between Simulation and a Portable Method
    Autorzy:
    Ibarra-Zarate, David
    Padilla-Ortiz, Ana Laura
    Powiązania:
    https://bibliotekanauki.pl/articles/176728.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    architectural acoustics
    acoustical parameters of room
    room acoustics
    mobile devices
    Opis:
    Large venues and auditoriums are commonly associated with their astounding architecture. Their acoustic quality is an essential factor in its qualification as a great and functional, or a badly designed place. However, acoustics is often overlooked during the design stage of a building due to the complexity and high cost of the measurements involved. For this reason, it is important to explore more accessible ways to implement acoustics evaluations. The aim of this work is to compare typical experimental measuring methods and the use of mobile devices to assess the acoustic quality of a room. These measurements are contrasted with the software simulation of the same acoustical space. The results show that the mobile system can be used for professional measurements with low restrictions in the frequency range of interest of this study (90 Hz to 4000 Hz).
    Źródło:
    Archives of Acoustics; 2020, 45, 1; 153-163
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic study of molecular interaction in binary liquid mixtures of n-hexane with alcohols
    Autorzy:
    Santhi, N.
    Sabarathinam, P.
    Alamelumangai, G.
    Madhumitha, J.
    Emayavaramban, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/411698.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    alkohol
    parametry akustyczne
    mieszaniny
    n-heksan
    n-hexane
    alcohol
    acoustical parameters
    mixtures
    Opis:
    Ultrasonic velocity, viscosity and density of alcohol[s] in n-hexane have been measured AT various temperatures in the range of 303.15 - 318.15K. From the experimental data, the acoustical parameters such as molar volume, adiabatic compressibility, intermolecular free length and their excess values have been computed and presented as functions of compositions. The deviations from ideality of the acoustical parameters are explained on the basis of molecular interactions between the components of the mixtures. The variations of these parameters with composition of the mixture suggest the strength of interactions in these mixtures.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 5; 59-71
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Measurement of Physical and Acoustical Parameters of Poly(Ethyleneglycol-400 Maleate) Resin
    Autorzy:
    Pandya, Dhananjay
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075756.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Acoustical parameters
    FT-IR
    Physical parameters
    Poly(Ethyleneglycol-400 Maleate) resin
    Sound velocity
    Synthesis
    Viscosity
    Opis:
    Poly(Ethyleneglycol-400 Maleate) Resin was synthesized and characterized by FT-IR. The physical and acoustical parameters such as Intrinsic viscosity, Acid value, Density, Viscocity, Sound velocity, Wavelength, Isentropic compressibility, Specific acoustical impedance, Rao’s molar sound function, Apparent molecular weight, Van-der Waal’s constant, Internal pressure, Classical absorption coefficient, Viscous relaxation time, Solvation number, Apparent molar volume, Apparent molar compressibility, Free volume and Inter molecular free path length were determined.
    Źródło:
    World Scientific News; 2019, 118; 144-163
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Measurement of Physical and Acoustical Parameters of Poly(Ethyleneglycol-600 Maleate) Resin
    Autorzy:
    Pandya, Dhananjay
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076046.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Acoustical parameters
    FT-IR
    Physical parameters
    Poly(Ethyleneglycol-600 Maleate) resin
    Sound velocity
    Synthesis
    Viscosity
    Opis:
    Poly(Ethyleneglycol-600 Maleate) Resin was synthesized and characterized by FT-IR. The physical and acoustical parameters such as Intrinsic viscosity, Acid value, Density, Viscocity, Sound velocity, Wavelength, Isentropic compressibility, Specific acoustical impedance, Rao’s molar sound function, Apparent molecular weight, Van-der Waal’s constant, Internal pressure, Classical absorption coefficient, Viscous relaxation time, Solvation number, Apparent molar volume, Apparent molar compressibility, Free volume and Inter molecular free path length were determined.
    Źródło:
    World Scientific News; 2019, 117; 82-101
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic Assisted Synthesis, Acoustical Property and Antibacterial Activity of Some Schiff Bases
    Autorzy:
    Premalatha, R.
    Santhi, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/412100.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted anilines
    3-bromo-4-fluorobenzaldehyde
    Schiff bases
    ultrasonication
    acoustical parameters and antimicrobial activity
    Opis:
    An efficient, simple clean synthesis of Schiff bases of some 4-nitroaniline/ 2,4-dinitroaniline/ 3,4-dichloroaniline / 4-methoxy-3-nitro aniline with 3-bromo-4-fluorobenzaldehyde were done by an ultrasound irradiation method. The major advantages of ultra-sonication are short reaction time, operational simplicity, high yield, easy workup and environment friendly procedure. The isolated compounds obtained by ultrasound irradiation method were characterized by UV, IR and NMR spectral data. These acoustical parameters were determined. Furthermore their antibacterial activities are screened against certain strains of bacteria and showed significant anti-microbial activity.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 14, 1; 53-64
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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