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    Wyświetlanie 1-11 z 11
    Tytuł:
    Hammett spectral correlations in benzofuranyl flavonols
    Autorzy:
    Thirunarayanan, G.
    Sekar, K. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412326.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Benzofuranyl flavonols
    Hammett equation
    IR spectra
    NMR spectra
    Regression analysis
    Opis:
    A series containing eleven benzofuranyl flavonols have been prepared by cyclization of 3-hydroxybenzofuranyl chalcones with 30 % hydrogen peroxide in the presence of sodium bicarbonate. The synthesized flavonols were characterized by their physical constants, analytical and spectroscopic data. The infrared spectral νOH, CO stretches(cm-1), NMR chemical shifts of OH, CO(δ, ppm) of these flavonols 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 on the above group frequencies were discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 6; 39-47
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of substituents on 4-(substituted phenyl sulfonamide)benzoic acids by IR and NMR spectra
    Autorzy:
    Muthuvel, I.
    Thirunarayanan, G.
    Dineshkumar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1059444.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    4-(substituted phenyl sulfonamide) benzoic acids
    Hammett correlations
    IR and NMR spectra
    Regression analysis
    Opis:
    About nine 4-(substituted phenyl sulfonamide) benzoic acid derivatives were synthesized by ultrasound irradiation method. The synthesized sulfonamides were characterized by their physical constants and spectroscopic data. The characteristic infrared SOsym, SOasym, NH and CO vibrations (ν, cm-1), the chemical shifts (δ, ppm) of NH and CO of sulfonamides were assigned and correlated with various Hammett substituent constants and Swain-Lupton parameters using single and multi-regression analysis. From the results of the statistical analysis, the effects of substituents on the spectral frequencies were discussed.
    Źródło:
    World Scientific News; 2019, 128, 2; 216-233
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlations in some substituted styryl (E)-4-((2-oxopropyl) diazenyl) benzoic acids
    Autorzy:
    Sathiyendiran, V.
    Sekar, K. G.
    Thirunarayanan, G.
    Arulkumaran, R.
    Sundararajan, R.
    Kamalakkannan, D.
    Suresh, R.
    Manikanadan, V.
    Vijayakumar, R.
    Vanangamudi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412199.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxo-propyl diazenyl benzoic acid chalcones
    IR spectra
    NMR spectra
    Hammett equation
    Regression analysis
    Opis:
    A series of titled compounds were prepared and analyzed their purities by literature method. The infrared and NMR spectral group frequencies of the compounds were assigned and correlated with Hammett substituent constants, F and R constants using single and multi linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral frequencies was discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 33-43
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared and 13C NMR Spectral Correlation Analysis of Some Substituted Oxazepin Based Ketone and Thione Derivatives with Hammett Constant
    Autorzy:
    Sathiyamoorthi, K.
    Kamalakkannan, D.
    Suresh, R.
    Sakthinathan, S. P.
    Arulkumaran, R.
    Sundararajan, R.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193044.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxazepins
    IR
    13C NMR
    Hammett constant
    F and R parameter
    Single and multi-regression analysis
    Opis:
    Single and multi-regression analysis was applied for the corrosion study of transmission of substituent effects on IR carbonyl stretching frequencies and 13C chemical shifts of some substituted oxazepin compounds. The substituent effects were estimated on the basis of results of the statistical analysis. The differences among the obtained regression coefficients were discussed in terms of the relative importance of the field, inductive and resonance effects of substituent.
    Źródło:
    World Scientific News; 2016, 58; 48-64
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Hammett spectral QSAR analysis of some (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
    Autorzy:
    Vijayakumar, S.
    Manikandan, V.
    Arulkumaran, R.
    Christuraj, P.
    Sundararajan, R.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1076503.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones
    IR
    NMR spectra
    QSAR study
    UV
    regression analysis
    Opis:
    About nine substituted (E)-1-(4-methoxyphenyl)-3-phenylprop-2-en-1-ones have been synthesized by solvent-free method. These enones were analyzed by spectral techniques. The characteristic spectral frequencies were correlated through Hammett equation with Hammett substituent constants, F and R parameters using single and multi-regression analysis method. From the statistical analysis results, the quantitative structure activity relationships have been discussed by means of effects of substituents on the spectral frequencies.
    Źródło:
    World Scientific News; 2019, 115; 52-67
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation analysis of substituted 2-((phenyl amino)methyl)-1,2-dihydro-5-(3-methoxyphenyl)-1-phenyl-1,2,4-triazole-3-thiones
    Autorzy:
    Thirunarayanan, G.
    Kamalkkannan, D.
    Suresh, R.
    Sakthinathan, S. P.
    Sundararajan, R.
    Arulkumara, R.
    Manikandan, R.
    Vanangamudi, G.
    Sathiyendiran, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1194047.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    1-2-4-triazole
    Hammett constants
    IR spectral
    NMR spectral
    Swain-Lupton’s parameters
    correlation
    multi-regression analysis
    Opis:
    A series of substituted 2-((phenyl amino)methyl)-1,2-dihydro-5-(3-methoxyphenyl)-1-phenyl-1,2,4-triazole-3-thione compounds were synthesized and examined their purities as per the literature. The IR spectra of νC=N, νC=S, νNH and νCOC frequencies and NMR chemical shifts (ppm) of δNH, δOCH3, δCH2, δC=N, δC=S, δOCH3 and δCH2 are also assigned. The assigned IR and both 1H NMR and 13C NMR spectral data have been correlated with Hammett substituent constants and Swain-Lupton’s parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral data has been studied.
    Źródło:
    World Scientific News; 2015, 12; 24-43
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlation analysis of Hammett substituent constants and biological activities of some (E)-1-(4-phenoxyphenyl)-3-phenylprop-2-en-1-ones
    Autorzy:
    Kalyanasundaram, N.
    Sakthinathan, S. P.
    Suresh, R.
    Kamalakkannan, D.
    Joseph, S. J.
    Vanangamudi, G.
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412539.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted styryl 4-phenoxyphenylketones
    UV-spectra
    IR spectra
    NMR spectra
    Hammett constants
    substituent effects
    regression analysis and antimicrobial activities
    Opis:
    A series of aryl chalcones have been synthesized from 4-phenoxyacetophonone with various substituted benzaldehydes. The purity of all chalcones has been checked using their physical constants and spectral data. These spectral data have been correlated with Hammett substituent constants and F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral data has been studied. The single parameter correlation with few Hammett constants and F and R parameters gave satisfactory correlation coefficients whereas all multiple correlations gave satisfactory correlation coefficients with Resonance, Field and Swain-Lupton’s parameters. The antimicrobial activities of all chalcones have been studied using Bauer-Kirby method.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 9; 23-47
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Hammett equation on IR and NMR spectral data of (5-bromothiophen-2-yl) (3-(4-methoxyphenyl)bicyclo[2.2.1]hept-5-en-2-yl)methanones
    Autorzy:
    Thirunarayanan, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182868.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (5-bromothiophen-2-yl)(3-substituted phenyl)bicyclo[2.2.1]hept-5-en-2-yl)methanones
    ir and nmr spectra
    hammett equation
    hammett substituent constants
    regression analysis
    electronic effects
    Opis:
    More than 60% yield of the titled compounds, (5-bromothiophen-2-yl)(3-substituted phenyl) bicyclo[2.2.1]hept-5-en-2-yl)methanones were prepared and examined their purities by literature method. The characteristic infrared spectral frequencies (cm-1) and NMR chemical shifts (ppm) of these ketones were assigned. These spectral data were applied to Hammett equation with Hammett substituent constants for prediction of effects substituent using single and multi-regression analysis. From the results of statistical analysis, the electronic effect of substituents on the spectral data has been studied.
    Źródło:
    World Scientific News; 2016, 53, 3; 138-156
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trend analysis of flood peaks in lower reaches of Satluj River, Himachal Pradesh, India
    Autorzy:
    Kumar, S.
    Santosh, ---
    Powiązania:
    https://bibliotekanauki.pl/articles/970628.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    flood peaks
    mann-kendall test
    satluj river basin
    regression
    trend analysis.
    Opis:
    Climate change arising from anthropogenic driven emissions of greenhouse gases has emerged as one of the most important environmental issues in the last two decades. One of the most significant potential consequences of climate change may be alteration in regional hydrological cycle and river flow regimes. Increased temperature is expected to increase the peak flows in snowfed rivers of Himalayas. The changing pattern of regional temperature on flood peaks deserves urgent and systematic attention over a basin which provides an insight view of historical trends. Lower reaches of Satluj River is selected for the present study. Testing the significance of observed trends in flood peaks has received a great attention recently, especially in connection with climate change. The data series available was 48 years (1967-2010). The records were subjected to trend analysis by using both non-parametric (Mann-Kendall test) and parametric (linear regression analysis) procedures. For better understanding of the observed trends, flood peaks were computed into standardised flood peak indices (SFPI). These standardised data series were plotted against time and the linear trends observed were represented graphically. The analysis of flood peaks at different observation stations in lower reaches of Satluj River showed a large variability in the trends and magnitudes. The trend analysis results of flood peaks and gauge heights indicate that the flood peaks at all sites i.e. Rampur, Suni and Kasol show increasing but statistically insignificant trends. The trends in gauge height at all sites are also showing increasing trend but Kasol is statistically significant at 95% confidence level. The fast melting of glaciers, incessant monsoon rainfall and the synchronisation of the discharge peaks are the main causes of river floods. The past flood peaks will help us to observe the frequency of occurrence of floods in certain region and to determine whether the flood peaks in the past have been same with that of the present or whether there is any deviation in the trend in relation to climate change. Such studies will help in designing mitigation and adaptation strategies towards extreme hydrological events.
    Źródło:
    International Letters of Natural Sciences; 2015, 46
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trend analysis of rainfall in Satluj River Basin, Himachal Pradesh, India
    Autorzy:
    Kumar, Sandeep
    Gill, G. S.
    Santosh, Santosh
    Powiązania:
    https://bibliotekanauki.pl/articles/1193980.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Himachal Pradesh
    Mann-Kendall test
    Rainfall
    Regression
    Satluj River Basin
    Trend analysis
    Opis:
    attention recently, especially in connection with climate change. The changing pattern of rainfall deserves urgent and systematic attention for planning, development, utilisation and management of water resources. The daily data on variable were converted to monthly and then computed to seasonal and annual series. Annual rainfall (mm/yr) was calculated as the sum of monthly values. The missing values in the data were computed by using average method. The records of rainfall were subjected to trend analysis by using both non-parametric (Mann-Kendall test) and parametric (linear regression analysis) procedures. For better understanding of the observed trends, data were computed into standardised precipitation indices (SPI). These standardised data series were plotted against time and the linear trends observed were represented graphically. Trend analysis results of rainfall show that out of 15 annual trends 6 (40%) are increasing and 9 (60%) are decreasing in nature where 1 (6.6%) is statistically significant (increasing) and 2 (13.3%) are statistically significant (decreasing) at 95% confidence level. Similarly, the changes were investigated for the four seasons: winter (December-March), pre-monsoon (April-June), monsoon (July-September) and post-monsoon (October-November). The analysis of rainfall, annual as well as seasonal, of different gauge stations in Satluj River Basin showed a large variability in the trends and magnitudes from 1984 to 2010. The rainfall shows great temporal and spatial variations, unequal seasonal distribution with frequent departures from normal. Majority of gauge stations have experienced decreasing trends, both on seasonal and annual scales. Some were statistically significant at 95% confidence level. The sensitivity of rainfall variations provides important insight regarding the responses and vulnerability of different areas to climate change. It will further strengthen the formulation of future strategy for management of water resources.
    Źródło:
    World Scientific News; 2015, 14; 1-55
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on a number of applicable forecasting techniques in economic analysis, supporting enterprises to decide management
    Autorzy:
    Hang, Nguyen Thi
    Powiązania:
    https://bibliotekanauki.pl/articles/1075674.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Forecasting
    applied informatics in business
    economic analysis tools
    linear regression
    moving average
    Opis:
    Forecasting is an important tool, an indispensable part in the operation of businesses to help create a competitive advantage, thereby assisting corporate executives in proactively planning and necessary decisions for production, business, investment, promotion, production scale, product distribution channel, financial supply ... and preparation of sufficient facilities, Techniques for development in the future. In businesses, doing good forecasting will create conditions to improve competitiveness in the market. Thai Nguyen is one of the provinces in the Northern Midlands and Mountains region, with over 6000 businesses in operation. This is the locality which is assessed to have a fast growing market and many changes, accurate forecasting becomes more necessary for businesses to save costs and increase competitiveness. Forecasting will create important tools, support managers in setting up measures to adjust economic activities of their units in order to obtain the highest production and business efficiency, highly adapt to trend of integration and development.
    Źródło:
    World Scientific News; 2019, 119; 52-67
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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