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    Wyświetlanie 1-7 z 7
    Tytuł:
    Extraction rate of nickel in aqueous ammonium sulfate solution with 5-dodecylsalicylaldoxime in kerosene
    Autorzy:
    Sana, T.
    Fujii, R.
    Shiomori, K.
    Kawano, Y.
    Nagayoshi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/346929.pdf
    Data publikacji:
    2002
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    nickel
    5-dodecylsalicylaldoxime
    extraction rate
    interfacial reaction
    Lewis type transfer cell
    Opis:
    In order to clarify the adsorption equilibrium for the species of the extractant and the extraction complex, the interfacial tensions between the aqueous and the organic solutions were investigated, using equilibrated kerosene solution in the presence of 5-dodecylsalicylaldoxime (LIX® 860-IC) and aqueous solution in the presence and absence of nickel ion. The interfacial tensions decreased with increasing in the concentration of LIX® 860-IC. Experimental results of the interfacial tension were analyzed by Gibb’s adsorption isotherm. The adsorption equilibrium constant and the interfacial area for the extractant and the extraction complex were determined. The extraction rate of nickel from the aqueous ammonium sulfate solution with LIX® 860-IC in kerosene was investigated using a Lewis-type transfer cell. The concentration effects of extractant, nickel, and hydrogen ion on the extraction rate were examined. The extraction rate increased with increasing in the concentrations of nickel and the extractant, and approached to constant values depending on the extractant concentration at a high concentration of nickel. The rate increased with decreasing in the concentration of hydrogen ion, and approached to constant values depending on the extractant concentration. These results were analysed based on an interfacial reaction model in which the reaction proceeds between an extractant species adsorbed at the interface and nickel ion in the aqueous solution. The extraction rate is interpreted based on the rate equation in which the interfacial reaction between a 1:1 nickel chelate complex species adsorbed at the interface and the extractant in the organic solution is the rate-determining step. The reaction rate constants and equilibrium constants were determined.
    Źródło:
    Ars Separatoria Acta; 2002, 1; 35-44
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Direct measurements of reaction time for extractive processes
    Autorzy:
    Gotfryd, L.
    Becker, K.
    Pietek, G.
    Szołomicki, Z.
    Piwowonska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/109772.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    reaction time
    solvent extraction
    viscosity
    stripping rate
    sulphuric acid
    Opis:
    Extraction times for selected metal cations (Mg2+, Al3+, Zn2+, Cd2+, Cu2+, Ni2+, Co2+, Mn2+, Fe2+ and Fe3+) have been measured using cation-exchanging extractants - Versatic 10 (neodecanoic acid), DEHPA (bis(2-ethylhexyl)phosphoric acid) and Cyanex 272 (bis(2,4,4-trimetylpentyl)phosphinic acid). Data was collected directly by measuring and recording pH of the two phase reaction mixture with maintaining continuity of the aqueous phase. Similarly, the stripping rate of selected cations (Mg2+, Al3+, Zn2+, Cu2+, Ni2+, Co2+) in a sulphuric acid solution was measured. Viscosities of organic phases, saturated with cations, were measured before their stripping. Additionally, the extraction dependence of Mg2+, Al3+, Fe2+ and Fe3+ on pH was measured using Versatic 10 at various concentrations (7.5, 15 and 30 %).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 909-919
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction of eucalyptus oil as reduction of bacterial growth in drinking water
    Autorzy:
    Dubey, A.K.
    Sahu, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/11148.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    extraction
    eucalyptus oil
    reduction
    bacterial growth
    drinking water
    composition
    essential oil
    growth rate
    microbe
    Opis:
    Drinking water is acting as life line for living thing on the Earth, without that no life. Due to global industrialization availability of pure water is one of the major issues. The effluent are directly or indirectly discharge through the river stream, which affect the ground as well as sea water and climatically cycle water reach to us. In that condition medicine are required for quire purpose. In the world so many plants and herbs are available which are used as antimicrobial and sources of medicines. Today the large number of drugs in use is derived from plants. The important advantages for therapeutic uses of medicinal plants in various ailments are their safety besides being economical, effective and easy availability. In this regard’s herb plant Eucalyptus extracted oil is used as antibacterial agent to treat the drinking water.
    Źródło:
    International Letters of Natural Sciences; 2014, 11, 2
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybridisation of Mel Frequency Cepstral Coefficient and Higher Order Spectral Features for Musical Instruments Classification
    Autorzy:
    Bhalke, D. G.
    Rama Rao, C. B.
    Bormane, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/176497.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    feature extraction
    MFCC
    HOS
    bispectrum
    bicoherence
    non-linearity
    non-Gaussianity
    CPNN
    zero crossing rate (ZCR)
    Opis:
    This paper presents the classification of musical instruments using Mel Frequency Cepstral Coefficients (MFCC) and Higher Order Spectral features. MFCC, cepstral, temporal, spectral, and timbral features have been widely used in the task of musical instrument classification. As music sound signal is generated using non-linear dynamics, non-linearity and non-Gaussianity of the musical instruments are important features which have not been considered in the past. In this paper, hybridisation of MFCC and Higher Order Spectral (HOS) based features have been used in the task of musical instrument classification. HOS-based features have been used to provide instrument specific information such as non-Gaussianity and non-linearity of the musical instruments. The extracted features have been presented to Counter Propagation Neural Network (CPNN) to identify the instruments and their family. For experimentation, isolated sounds of 19 musical instruments have been used from McGill University Master Sample (MUMS) sound database. The proposed features show the significant improvement in the classification accuracy of the system.
    Źródło:
    Archives of Acoustics; 2016, 41, 3; 427-436
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanizmy kształtujące cenę ropy naftowej w teorii i rzeczywistości
    Factors Shaping Crude Oil Prices in Theory and Practice
    Autorzy:
    Potocki, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/575661.pdf
    Data publikacji:
    2009-10-31
    Wydawca:
    Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
    Tematy:
    crude oil prices
    Hotelling rule
    nonrenewable resources
    extraction costs
    interest rate
    short-term equilibrium model
    resource/production ratio
    Opis:
    The article examines the influence of various factors on the price of crude oil according to two approaches: American economist Harold Hotelling’s rule of nonrenewable resources and a theory known as the short-term equilibrium approach. Empirical studies show that the Hotelling rule does not hold true in practice, Potocki says, because it is based on unstable assumptions. These include changing extraction costs and variable interest rates, in addition to factors such as market failure and strategic interactions. The short-term equilibrium model describes a crude oil pricing mechanism that is determined by a combination of economic, political and psychological factors among which the equilibrium of crude oil inventories plays a key role. The author is critical of the widespread use of a static resource/production ratio and argues that researchers should think over the consequences of misinterpreting this ratio and the implications of overestimating crude oil resources.
    Źródło:
    Gospodarka Narodowa. The Polish Journal of Economics; 2009, 235, 10; 1-32
    2300-5238
    Pojawia się w:
    Gospodarka Narodowa. The Polish Journal of Economics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remediation of soils contaminated with trichloroethylene
    Autorzy:
    Albergaria, J. T.
    Alvim-Ferraz, M. C. M.
    Delerue-Matos, C. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/363146.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    szybkość przepływu powietrza
    desorpcja próżniowa
    zanieczyszczenie
    gleba
    zawartość wody
    trichloroetylen
    airflow rate
    soil vapor extraction
    soil water content
    trichloroethylene
    Opis:
    Soil contamination is a common problem in our society. Several activities introduce contaminants in soils affecting their quality and future utilization. In order to invert this situation and to avoid further spreading of the contaminant several remediation technologies could be used. For soils contaminated with trichloroethylene (TCE), Soil Vapor Extraction (SVE) can be an efficient remediation technology. It involves the application of vacuum to the soil matrix creating an airflow that conduce the volatized contaminant to extraction wells that lead them to the exterior of the soil where they are properly treated. This work presents the results obtained in the soil vapor experiments performed in a laboratory using soils with different water contents contaminated with TCE. These experiments aimed the study of the influence of soil water content and the airflow used in the remediation time and on the process efficiency. The results showed that in sandy soils contaminated with TCE: a) for similar levels of contamination, the increase of the soil water content from 0 to 4% created an increase of the concentration of TCE in the gas phase of the soil, in some cases by almost 50%; b) the influence of water content is not significant being overlapped by influence of the airflow rate; c) SVE performed with higher airflow rates had shorter remediation times (in some cases four times shorter) without any significant impact on the process efficiencies (fluctuations of 1 to 3%); and d) for the experimented soils, the utilization of higher airflow rates led to shorter and consequently cheaper remediation.
    Źródło:
    Environmental Biotechnology; 2010, 6, 2; 37-41
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O potrzebie racjonalizacji stawek podatku od wydobycia niektórych kopalin
    Autorzy:
    Pest, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/609977.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    tax on the extraction of certain minerals
    copper
    silver
    tax rate
    podatek od wydobycia niektórych kopalin
    miedź
    srebro
    stawka podatku
    Opis:
    The tax on the extraction of certain minerals was introduced into the Polish law by the Law of March 2, 2012 which entered into force on April 18 the same year. The purpose of the Act was to ensure the profits of the state budget from entities extracting copper and silver. Since its introduction, the tax on the extraction of certain minerals raised many doubts among both practitioners and theorists. This article aims to outline the major controversy concerning those tax rates: 1) compliance method of determining tax rates with the constitutional principle of exclusivity Act in the area of tax law, 2) the asymmetry of tax rates, 3) no mechanism to support new investments.
    Podatek od wydobycia niektórych kopalin został wprowadzony do polskiego porządku prawnego ustawą z dnia 2 marca 2012 r., która weszła w życie 18 kwietnia tego samego roku. Założeniem projektodawcy ustawy było uchwycenie nadzwyczajnych zysków podmiotów wydobywających miedź i srebro. Od momentu wprowadzenia podatek od wydobycia niektórych kopalin budził liczne wątpliwości zarówno wśród praktyków, jak i teoretyków. Celem artykułu było zarysowanie najważniejszych kontrowersji dotyczących stawek podatku od wydobycia niektórych kopalin, w tym: 1) zgodności sposobu określania stawek podatku z konstytucyjną zasadą wyłączności ustawy w sferze prawa podatkowego, 2) asymetryczności stawek podatku, 3) braku mechanizmu wspierania nowych inwestycji.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia; 2016, 50, 1
    0459-9586
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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