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Wyszukujesz frazę "Pogorzelski, S. J." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    The surface film effect on underwater noise of rain
    Autorzy:
    Pogorzelski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332822.pdf
    Data publikacji:
    1997
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The spectrum of rain noise shows a peak at 13.5 - 15kHz, stronger winds smear the peak. The spectral level (SL) at 15 kHz shows a linear dependence on the log of the rain rate with wind speed as a parameter. The presence of a monomolecular film on the sea surface results in a pronounced reduction of SL beneath the film by 10 log K. The damping ratio K is related to the viscoelastic properties, surface activity, concentration and diffusional coefficient of the surface-active substances composing the film.
    Źródło:
    Hydroacoustics; 1997, 1; 181-184
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorptive properties of natural water surfactant films. Dead Vistula catchment water studies
    Autorzy:
    Pogorzelski, S.J.
    Kogut, A.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/48236.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    temporal variability
    natural water
    inland water
    natural film
    surface isotherm
    scaling procedure
    spatial variability
    surfactant
    adsorption kinetics
    Vistula River
    catchment area
    Opis:
    The paper contains the results of natural film experiments carried out on inland waters in the Dead Vistula (Martwa Wisła) catchment area during 1999–2002 using the integrated Langmuir trough-Wilhelmy plate system,w hich ‘cuts out’ an undisturbed film-covered area without any physicochemical sample processing. The static film parameters result from the generalized scaling procedures applied to the surface pressure-area isotherms. They appear to correspond well to observations of the film composition (Alim, MW, Eisoth),film solubility and the miscibility of its components (via R, ΔSc and y factors),and surface concentration (πeq, Γeq). A novel approach is presented for the adsorption dynamics on the basis of the mixed kinetic-diffusion model and analyses of the dynamic surface pressure plots,whic h leads to the determination of the effective relative diffusion coefficient Deff/D and activation energy barrier Ea/RT . There is reason to believe that certain classes of film-forming components or ‘end-members’ may dominate the static and dynamic surface properties. Some of these substances can be used as source-specific surface-active biomarkers to trace temporal and spatial changes due to environmental factors or the production of biological matter. The concept was tested for the Dead Vistula river and its tributaries. The results demonstrate that natural films are a complex mixture of biopolymeric molecules covering a wide range of solubilities,sur face activities and molecular masses with an apparent structural film architecture. Such studies could lead to the development of film structure parameters – indicators of ecosystem quality and the state of the environment.
    Źródło:
    Oceanologia; 2003, 45, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of marine surfactant adsorption at an air-water interface. Baltic Sea studies
    Autorzy:
    Pogorzelski, S.J.
    Kogut, A.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/48394.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coastal water
    water interface
    surface adsorption
    marine film
    kinetics
    Baltic Sea
    adsorption barrier
    adsorption
    Opis:
    The paper contains the results of studies of natural surface film adsorption kinetics carried out in inland waters and in shallow offshore regions of the Baltic Sea during 2000–01 under calm sea conditions. The novel approach presented here for the adsorption dynamics is based on the mixed kinetic-diffusion model and analyses of the surface pressure-time plots at short (t → 0) and long (t→∞) adsorption time intervals. Values of the effective relative diffusion coefficient Deff/D (= 0.008 − 0.607) and energy barrier for adsorption Ea/RT (= 0.49 − 7.10) agree well with the data reported for model non-ionic surfactant solutions of pre-cmc concentrations. Wind speed is one of the factors affecting the adsorption barrier via the increased surface pressure of the natural film exposed to wind shear stress (∼ U10 2),a nd enters the relation Ea/RT = 1.70U10 1/3.
    Źródło:
    Oceanologia; 2001, 43, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static and dynamic properties of surfactant films on natural waters
    Autorzy:
    Pogorzelski, S.J.
    Kogut, A.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/49159.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    natural water
    Mediterranean Sea
    dynamic property
    water condition
    surfactant
    marine film
    Baltic Sea
    viscoelasticity
    static property
    Opis:
    The paper contains the results of natural surface film surface pressure – area experiments carried out in inland waters and shallow offshore regions of the Baltic and Mediterranean Seas during 1990–99 under calm water conditions using the Langmuir trough – Wilhelmy filter paper plate system, which ‘cuts out’ an undisturbed film-covered sea area without any initial physico-chemical sample processing. The limiting specific area Alim (268–3157 ˚A2/molecule−1) and mean molecular mass (0.65–9.7 kDa) of microlayer surfactants were determined from the 2D virial equation of state applied to the isotherms. Film structure signatures were derived from π − A isotherm hysteresis and application of the 2D polymer scaling theory. The stress-relaxation measurements revealed a two-step relaxation process at the interface with characteristic times τ1 (1.1–2.8) and τ2 (5.6–25.6) seconds suggesting the presence of diffusion-controlled and structural organization relaxation phenomena. The results demonstrate that natural films are a complex mixture of biomolecules covering a wide range of solubilities, surface activity and molecular mass with an apparent structural organization exhibiting a spatial and temporal variability.
    Źródło:
    Oceanologia; 2001, 43, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelastic surface properties of seawater in coastal areas of the Baltic Sea
    Autorzy:
    Boniewicz-Szmyt, K.
    Pogorzelski, S.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48574.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    thermoelastic surface property
    viscoelasticity
    surface tension
    sea water
    Baltic Sea
    coastal area
    crude oil
    physicochemical property
    Źródło:
    Oceanologia; 2016, 58, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption of natural surfactants present in sea waters at surfaces of minerals: contact angle measurements
    Autorzy:
    Mazurek, A.
    Pogorzelski, S.J.
    Boniewicz-Szmyt, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/48416.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    mineral
    Baltic Sea
    natural surfactant
    solid-liquid interface
    Gdansk Gulf
    film pressure
    contact angle hysteresis
    film-covered surface
    sea water
    adsorption
    Opis:
    The wetting properties of solid mineral samples (by contact angles) in original surfactant-containing sea water (Gulf of Gdańsk,Ba ltic) were characterised under laboratory conditions on a large set (31 samples) of well-classified stones of diverse hydrophobicity using the sessile drop (ADSA-P approach),ca ptive bubble and inclined plate methods. An experimental relation between the static contact angle θeq and stone density ρ was obtained in the form θeq = Bρ + C,wher e B = 12.23 ± 0.92, C = −(19.17 ± 0.77),an d r2 = 0.92. The histogram of θeq distribution for polished stone plates exhibited a multimodal feature indicating that the most abundant solid materials (hydrophilic in nature) have contact angles θeq = 7.2,10. 7,15. 7 and 19.2◦,whic h appear to be applicable to unspecified field stones as well. The contact angle,a pH-dependent quantity,ap pears to be a sensitive measure of stone grain size,e.g . granite. The captive bubble method gives reproducible results in studies of porous and highly hydrophilic surfaces such as stones and wood. The authors consider the adsorption of natural sea water surfactants on stone surfaces to be the process responsible for contact angle hysteresis. In the model,an equation was derived for determining the solid surface free energy from the liquid’s surface tension γLV; it also enabled the advancing θA and receding θR contact angles of this liquid to be calculated. Measurements of contact angle hysteresis Δθ(= θA − θR) with surfactant-containing sea water and distilled water (reference) on the same stone surfaces allowed the film pressure ΔΠ (1.22 to 8.80 mJ m−2), solid surface free energy ΔγS (−17.03 to −23.61 mJ m−2) and work done by spreading ΔWS (−1.23 to −11.52 mJ m−2) to be determined. The variability in these parameters is attributed to autophobing,an effect operative on a solid surface covered with an adsorptive layer of surfactants. The wetting behaviour of solid particles is of great importance in numerous technological processes including froth flotation,d emulgation,an ti-foaming procedures and the coal industries. It is believed that the approach presented here and the examples of its application to common sea water/solid mineral systems could be successfully adapted to optimise several surfactant-mediated adsorption processes (see below) of practical value in natural water ecology.
    Źródło:
    Oceanologia; 2009, 51, 3; 377-403
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoacoustic Study of the Interaction Between Thin Oil Layers with Water
    Autorzy:
    Szurkowski, J.
    Pawelska, I.
    Wartewig, S.
    Pogorzelski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014031.pdf
    Data publikacji:
    2000-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.70.Cv
    36.20.Ng
    68.15.+e
    Opis:
    In the presented paper the structural changes in thin olive oil layers taking place as a result of interaction with water using a photoacoustic technique were studied. The oil layers were spread from a solution in a volatile solvent (ethyl ether) on the water and copper surface. These studies are a natural continuation of the previous work on a layered system performed within the light range (680 nm), which pointed to the irregularities of oil layers related to their thickness is now expanded to the infrared band. A structural irregularity was observed for a layer thickness of 100 μm, but it did not appear for the one of pure bulk oil. Signatures of irregularity were clearly observed in the phase plots whereas the amplitude dependences were not sensitive to them. The performed studies allowed one to relate the diversity of thermal parameters in the samples with structural changes found in oil layers originated from oil-water interactions.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 6; 1073-1082
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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