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    Wyświetlanie 1-14 z 14
    Tytuł:
    Solubility of a pharmacological intermediate drug Isatin in different solvents at various temperatures
    Autorzy:
    Baluja, S.
    Bhalodia, R.
    Bhatt, M.
    Vekariya, N.
    Gajera, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/412531.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Isatin
    solubility
    Thermodynamic parameters
    Opis:
    The solubility of isatin in different solvents was studied by a gravimetrical method from (298.15 to 318.15) K under atmospheric pressure and the solubility data were correlated against temperature. The solvents selected for the present study are: water, methanol, ethanol, 1-butanol, dichloromethane, dichloroethane, chloroform and carbon tetra chloride. Among chlorinated solvents, solubility is observed to be maximum in 1, 2-dichloroethane and minimum in dichloromethane whereas in alcohols, maximum solubility is observed in methanol. In water, solubility is found to be minimum. Further, some thermodynamic parameters such as Gibb’s energy (ΔGsol), heat of solution (ΔHsol) and entropy of solution (ΔSsol) have also been evaluated.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 12; 36-46
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat exchangers technology and applications in heat exchanger engineering
    Autorzy:
    Omer, Abdeen Mustafa
    Powiązania:
    https://bibliotekanauki.pl/articles/1030671.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Absorption cycles
    environment
    heat pumps
    refrigeration cycles
    thermodynamic
    Opis:
    Over the years, all parts of a commercial refrigerator, such as the compressor, heat exchangers, refrigerant, and packaging, have been improved considerably due to the extensive research and development efforts carried out by academia and industry. However, the achieved and anticipated improvement in conventional refrigeration technology are incremental since this technology is already nearing its fundamentals limit of energy efficiency is described is ‘magnetic refrigeration’ which is an evolving cooling technology. The word ‘green’ designates more than a colour. It is a way of life, one that is becoming more and more common throughout the world. An interesting topic on ‘sustainable technologies for a greener world’ details about what each technology is and how it achieves green goals. Recently, conventional chillers using absorption technology consume energy for hot water generator but absorption chillers carry no energy saving. With the aim of providing a single point solution for this dual purpose application, a product is launched but can provide simultaneous chilling and heating using its vapour absorption technology with 40% saving in heating energy. Using energy efficiency and managing customer energy use has become an integral and valuable exercise. The reason for this is green technology helps to sustain life on earth. This not only applies to humans but to plants, animals and the rest of the ecosystem. Energy prices and consumption will always be on an upward trajectory. In fact, energy costs have steadily risen over last decade and are expected to carry on doing so as consumption grows. Refrigerants such as hydrochlorofluorocarbons (HCFCs) are present in the ground source heat pump (GSHP) systems and can pose a threat to the environment through being toxic, flammable or having a high global warming potential.
    Źródło:
    World Scientific News; 2020, 139, 2; 76-101
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and adsorption isotherm: application to corrosion inhibition studies of mild steel in 2 M HCl
    Autorzy:
    Abeng, F. E.
    Idim, V. D.
    Obono, O. E.
    Magu, T. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178372.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Adsorption isotherm
    inhibition mechanism
    mild steel
    thermodynamic parameters
    Opis:
    Ethanollic extract of Phyllanthus amarus (EEPA) was tested as corrosion inhibitor for mild steel in 2 M HCl solution using gravimetric and gasometric methods at 303, 313, 323 K and 333 K. The results revealed that the corrosion rate increases with temperature and time. Addition of the concentration of ethanollic extract of Phyllanthus amarus to the corroding environment lowered the corrosion rate of mild steel and increased inhibition efficiency (IE %) of ethanollic extract. Inhibition efficiency was found to decreased with temperature. Fitting of the experimental data to the Arrhenius and Transition state equations revealed that the Organic constituents of the extract were physically adsorbed on the corroding surface of the steel and adsorption of ethanollic extract of Phyllanthus amarus (EEPA) on mild steel surface was found to obey the Langmuir adsorption isotherm and Freundlich adsorption isotherm and sign of the Gibb’s fee energy of the adsorption obtained suggested that inhibitor molecules have been spontaneously adsorbed onto the mild steel surface. Positive values obtained for enthalpy change indicated that the adsorption of inhibitor is endothermic.
    Źródło:
    World Scientific News; 2017, 77, 2; 298-313
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical studies of binary liquid mixtures of p-chlorotoluene in benzene at different temperatures
    Autorzy:
    Kumar, G. P.
    Babu, Ch. P.
    Samatha, K
    Jyosthna, A. N.
    Showrilu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/412275.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ultrasonic velocity
    thermodynamic parameters
    p-chlorotoluene
    molecular interactions
    Opis:
    Ultrasonic velocities (U), densities (ρ), and coefficient of viscosities (η) are measured for binary mixtures containing (i) p-chlorotoluene and (ii) benzene at 303.15 K, 308.15 K, 313.15 K and 318.15 K to understand the molecular interaction. Various acoustical parameters such as adiabatic compressibility (βad), free length (Lf), acoustic impedance (Z), free volume (Vf), molar volume (Vm), Rao’s constant (R), Wada’s constant (W) and internal pressure (πi), are calculated from the measured values of U, ρ, and η. The trend in acoustical parameters also substantiates to asses strong molecular interactions.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 10; 25-37
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and evaluation of thermodynamic solubility of triazolo quinolone class derivatives in various solvents at 298.15-328.15 K
    Autorzy:
    Baluja, Shipra
    Pithiya, Mona
    Lava, Divyata
    Powiązania:
    https://bibliotekanauki.pl/articles/1031268.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Triazolo quinolone
    alcohols
    ethyl acetate
    solubility
    thermodynamic parameters
    Opis:
    The solubility of triazolo quinolone class derivatives in methanol, ethanol, n-propanol, n-butanol and ethyl acetate was measured using a gravimetrical method at temperature ranging from 298.15 K to 328.15 K. The results of these measurements were correlated with semi empirical equations. Some thermodynamic parameters such as dissolution enthalpy, Gibb’s free energy and entropy of mixing have also been calculated.
    Źródło:
    World Scientific News; 2021, 151; 16-30
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of thermodynamic properties for the biosorption of chromium by using cherry leaves (Muntingia calabura L.)
    Autorzy:
    Aathithya, R.
    Sowparnika, J.R.
    Balakrishnan, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/11897.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    thermodynamic property
    biosorption
    chromium
    cherry
    leaf
    Muntingia calabura
    entropy
    Opis:
    Chromium is a heavy metal which has widely used in tannery and electroplating industries. Contaminations of these industrial metals into the river possess major threat to an environment. Therefore, biosorption is a technique which is applied for the sorption of heavy metal by a biomaterial. In the present study reveals that cherry leaves was used as a biomaterial and for that the thermodynamic properties was evaluated for the biosorption of chromium. From the thermodynamic studies it was found that the reaction was feasible, spontaneous and exothermic because the values of ΔG = negative, ΔS = negative and ΔH = positive. So, it was concluded that the experiment was thermodynamically feasible.
    Źródło:
    International Letters of Natural Sciences; 2014, 20
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chalcones: A Solubility study at different temperatures
    Autorzy:
    Bhalu, A. A.
    Bhesaniya, K. D.
    Vekariya, N. J.
    Baluja, S. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/412118.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Chloroform
    dichloromethane
    thermodynamic parameters
    dissolution enthalpy
    Gibb’s energy and en tropy
    Opis:
    Some new chalcones are synthesized by the condensation of aryl ketones with aromatic aldehydes and solubility of these synthesized chalcones is determined in chloroform and dichloromethane at temperatures ranging between 293.15 K and 313.15 K by gravimetric method. The experimental data was correlated well with modified Apelblat equation. Further, from the experimental solubility data, some thermodynamic parameters such as dissolution enthalpy, Gibb’s energy and entropy etc. were evaluated using van’t Hoff equation. The positive Gibb’s energy and negative entropy suggests spontaneous dissolution and more ordered structure in solution.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 12; 7-19
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and Thermodynamic Studies for Corrosion Inhibition of API 5L X-52 Steel in 2 M HCl Solution by Moxifloxacin
    Autorzy:
    Ikpi, M. E.
    Abeng, F. E.
    Obono, O. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1118241.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    API 5L X-52 steel
    corrosion inhibition
    moxifloxacin and adsorption
    thermodynamic
    Opis:
    The inhibition of API 5L X-52 steel corrosion in an acidic medium by moxifloxacin at 303 K, 313 K and 323 K was monitored by potentiodynamic polarization measurement. The concentration of acid medium was maintained throughout the experiment. The inhibition efficiency was found to increased with increase in concentration of moxifloxacin and temperature. Activation energy, adsorption and thermodynamic parameters were evaluated from the study temperature. Herein, moxifloxacin brought about a decrease in activation energy Ea that reflects chemisorption. The adsorption of the moxifloxacin on the steel surface was found to obeyed Langmuir adsorption isotherm ΔGads values, indicating strong and spontaneous adsorption of the moxifloxacin on the surface of API 5L X-52 steel.
    Źródło:
    World News of Natural Sciences; 2017, 9; 52-61
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rethinking the Concept of Entropy
    Autorzy:
    Etkin, V. А.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068611.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    dissipation
    evolution
    inequalities
    irreversibility
    thermal death of the Universe
    thermodynamic and statistical entropy
    thermodynamics paralogism
    Źródło:
    World Scientific News; 2019, 132; 187-205
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Rotating Black Holes
    Autorzy:
    Vindana, W. M. H. P.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1158501.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Hawking radiation
    Hawking temperature
    Kerr black hole
    Kerr-Newman black hole
    entropy
    mass variation
    rotating black holes
    thermodynamic parameters
    Opis:
    Considering the analogy between classical thermodynamic parameters and black hole parameters, the four laws of thermodynamics are reinterpreted for Kerr and Kerr-Newman black holes. A simple model for the dynamic relationships was obtained by considering the surface area of the outer horizon of a Kerr and Kerr-Neumann black hole as the area of a perfect black body. Finding the conditions these black holes should satisfy, the equations were numerically solved and simulated for the Hawking temperature, Hawking radiation and entropy variations of Kerr and Kerr-Newman black holes. The Hawking temperature and Hawking radiation of a given rotating black hole drastically increases at the final stage of the black hole evaporation. In the meantime, the entropy of a rotating black hole drastically decreases through the time. The additional angular momentum and the charge effects gain high Hawking temperatures and high Hawking radiation values for the black holes while these effects reduce the entropy of the black holes.
    Źródło:
    World Scientific News; 2018, 114; 106-125
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion-exchange reaction thermodynamics to study the selectivity behaviour of nuclear and non-nuclear grade anion exchange resins
    Autorzy:
    Singare, P. U.
    Patange, A. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/412083.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ionic selectivity
    uni-univalent exchange
    thermodynamic equilibrium constant
    enthalpy
    nuclear grade ion exchange resin
    Auchlite ARA-9366
    Auchlite A-378
    Opis:
    In the present investigation, attempts were made to understand the difference in bromide ion selectivity of the two closely related anion exchange resins Auchlite ARA-9366 and Auchlite A-378 in chloride form. The selectivity difference was predicted based on the thermodynamic equilibrium constants and enthalpy values of Clˉ/Brˉ ion exchange reactions performed by using the two resins. During Clˉ/Brˉ exchange reactions, with rise in temperature from 30.0 °C to 45.0 °C, the equilibrium constant (K) values were observed to decreases from 8.15x10-2 to 6.06x10-2 for Auchlite ARA-9366 resins and from 2.16x10-2 to 1.10x10-2 for Auchlite A-378 resins. The decrease in K values with rise in temperature, indicate exothermic ion exchange reactions having enthalpy values of -36.14 and -18.38 kJ/mol respectively. The high K and low enthalpy values obtained for Auchlite ARA-9366 resins indicate their greater selectivity for the bromide ions in the solution as compared to Auchlite A-378 resins.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 6; 8-15
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamics of Ion-exchange reaction in predicting the ionic selectivity of Auchlite ARA-9366 and Auchlite A-378 anion exchange resins
    Autorzy:
    Singare, P. U.
    Patange, A. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/412499.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ionic selectivity
    uni-univalent exchange
    thermodynamic equilibrium constant
    enthalpy
    nuclear grade ion exchange resin
    Auchlite ARA-9366
    Auchlite A-378
    Opis:
    The paper deals with predicting the iodide ion selectivity of nuclear and non-nuclear grade anion exchange resins. The ionic selectivity prediction was made on the basis of thermodynamic data of Clˉ/I ˉ ion exchange reaction. It was observed that with rise in temperature from 30.0 °C to 45.0 °C, the equilibrium constant (K) values were observed to decreases from 59.77x10-2 to 23.77x10-2 for Auchlite ARA-9366 resins and from 9.01x10-2 to 4.05x10-2 for Auchlite A-378 resins. The decrease in K values with rise in temperature, indicate exothermic ion exchange reactions having enthalpy values of -47.87 and -39.51 kJ/mol respectively. The high K and low enthalpy values obtained for Auchlite ARA-9366 resins indicate their greater selectivity for the iodide ions in the solution as compared to Auchlite A-378 resins, when both the resins are present in chloride form.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 6; 1-7
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seed Shells as Active and Nontoxic Corrosion Inhibitors for Aluminum in Aggressive Acid Environment
    Autorzy:
    Nwanneka, Emembolu Loveth
    Okeychukwu, Onukwuli Dominic
    Kanwulia, Igbokwe Pilomena
    Powiązania:
    https://bibliotekanauki.pl/articles/1031576.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Acid inhibition
    Afzelia africana
    Aluminum corrosion
    Brachystegia eurycoma
    Derium microcarpum
    Mucuna flagellipes
    Pentaclethra macrophlla
    chemical measurements
    seed shell extracts
    thermodynamic parameters
    Opis:
    Chemical (weight loss and thermometric) measurements were used to study the corrosion inhibition characteristics of five seed shells, namely Afzelia africana seed shell (AASS), Brachystegia eurycoma seed shell (BESS), Derium microcarpum seed shell (DMSS), Mucuna flagellipes seed shell (MFSS) and Pentaclethra macrophlla seed shell (PMSS), respectively, on the inhibition of aluminum corrosion in aggressive 2.0 % HCl solutions at 30 and 50 °C for 8 hrs. Weight loss and thermometric measurements demonstrated that the seed shells (AASS, BESS, DMSS, MFSS and PMSS extracts) act as good corrosion inhibitors. Addition of the seed shell extracts decreases the corrosion rate of the process thereby improving inhibition performance. The result also reveals that the five seed shell extracts adsorb on the Aluminum surface through physical adsorption in accordance with Flory-Huggins and Langmuir adsorption isotherms at all temperatures investigated. Kinetic-thermodynamic parameters indicate a spontaneous adsorption process. Results of inhibition efficiency demonstrates that DMSS extract performed better as compared to BESS, AASS, PMSS and MFSS extracts.
    Źródło:
    World News of Natural Sciences; 2020, 31; 120-137
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Characteristics of Solid
    Autorzy:
    Pluta, Z.
    Hryniewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/411946.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    thermodynamic characteristics
    interstate space
    hermodynamics
    solid
    potential field
    specific proper heat energy
    specific gained heat energy
    energetic band
    heat work
    source characteristics of entropy growth
    entropy constant
    Opis:
    The paper is to present the developed thermodynamic characteristics of a solid. The existent description of dependence of temperature on the proper entropy (thermal capacitance) was used as the beginning point of the considerations. A critical evaluation of the picture of that dependence was a consecutive link of the considerations. Furthermore, an adequate description of the discussed heat phenomenon, taking into account the detailed characteristics of the entropy growth characteristics, has been presented. This characteristics indicates a clear quantum character of the studied reality, reflected by the potentials, proper and gained, respectively. These magnitudes are the measures of the proper and gained specific energies of this thermodynamic factor. The dependence of temperature on the specific energy has been described to formulate a formula on the heat work. At the end the dependence between the specific heat and the entropy constant is derived. In conclusion, a quantum nature of macroscopic reality has been noticed together with the definition of the heat energy notion. The necessity of noticing the description of any other reality in this scale has been indicated.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 2; 60-71
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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