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Wyszukujesz frazę "solvation" wg kryterium: Temat


Wyświetlanie 1-8 z 8
Tytuł:
Dynamics simulation studies of solvation effect on the trans-xylomollin conformation
Autorzy:
Mahboub, R.
Powiązania:
https://bibliotekanauki.pl/articles/412427.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
conformation
solvation
Distance Restraints
Dynamics Simulations
Opis:
The present work describes the solvation effect on the trans-xylomollin conformation. We have studied the trans-xylomollin conformations with the distance restraints using simulation calculations. Distance Restraint Molecular Dynamic (DR-MD) and Distance Restraint Langevin Dynamic (DR-LD) simulations of the trans-xylomollin were performed with an efficient program. The geometries, interaction energies, bonds, angles, and the Van der Waals (VDW) interactions were carried out in solution and gas phases. This comparative study shows that the trans-xylomollin acquires low total energy in solution using DR-MD method and stable conformation under the AMBER field. This molecule reaches its high stable conformation state in solution environment. The solvation effect is more important with DR-MD simulations. Our results are goods and in agreement with the used force field.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 8, 2; 132-140
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preferential solvation of amides by methanol - a comparison of molecular dynamics calculations with the experimental data
Autorzy:
Zielkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1965827.pdf
Data publikacji:
2001
Wydawca:
Politechnika Gdańska
Tematy:
amides
alcohols
preferential solvation
Kirkwood-Buff integrals
molecular dynamics simulations
Opis:
Using the Kirkwood-Buff theory of solutions, the preferential solvation of the N-methylacet-amide (NMA), N-methylformamide, (NMF), and N,N-dimethylformamide, (DMF), molecule has been investigated in the binary {amide+methanol} mixtures at 313.15 K. Moreover, for the {amide+methanol} mixtures, where amide = NMF, DMF, and NMA, the molecular dynamics calculations at xamide=0.518 were performed. From the obtained molecule-molecule radial distribution functions, (rdf), and atom-atom rdf, it was possible to estimate the local mole fractions around the amide molecule, the orientation effects of molecules within the solvation shell, and a possibility of the formation of complexes. The general picture obtained from analysis of the molecular dynamics results is consistent with the deductions derived from thermodynamic data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 3; 317-329
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of temperature and solvents on ultrasonic speed and thermo-acoustic parameters of epoxy resin of (2E, 6E)-bis (4-hydroxy benzylidene)-4-methylcyclohexanone solutions at four different temperatures
Autorzy:
Chopda, Jalpa V.
Sankhavara, Dharmesh B.
Patel, Jignesh P.
Parsania, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/1066232.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Density
Epoxy resin
Solvation number
Thermo-acoustic parameters
Ultrasonic speed
Viscosity
Opis:
The density (), viscosity () and ultrasonic speed (U) of 1, 4-dioxane (DO), tetrahydrofuran (THF), chloroform (CF) and solutions (0.25-5 wt%) of epoxy resin of (2E, 6E)-bis(4-hydroxy benzylidene)-4-methylcyclohexanone have been investigated at 298, 303, 308 and 313 K to understand molecular interactions in solutions of different polarity. Various acoustical and thermodynamic activation parameters such as acoustical impedance (Z), adiabatic compressibility (a), internal pressure (), free volume (Vf), intermolecular free path length (Lf), van der Waals constant(b), viscous relaxation time (), classical absorption coefficient (f2)cl, Rao`s molar sound function (Rm) and solvation number (Sn) were determined using, and U data and correlated with concentration (C) at four different temperatures (T). Good to excellent correlation between a given parameter and concentration is observed at all T. Linear or non-linear increase or decrease of studied acoustical and thermodynamic parameters with concentration of epoxy resin at different temperatures indicated existence of strong molecular interactions (solvent-solute and solute-solute) in the solutions. The non-linear increase of Sn with concentration of epoxy resin further supported the existence of strong molecular interactions and structure forming tendency of EMBHBC. The competing solvent-solute and solute-solute interactions are also supported by thermodynamic activation parameters (G, H and S).
Źródło:
World Scientific News; 2019, 131; 222-241
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular dynamics simulation of an aqueous Na2SO4 solution
Autorzy:
Nieszporek, Krzysztof
Nieszporek, Jolanta
Powiązania:
https://bibliotekanauki.pl/articles/764099.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
hydrogen bond
sulfate
water
solvation structure
tip3p
radial distribution function
hydration shell
Opis:
The structure of sodium sulfate in tip3p water solution with the concentration of 0.1191 mol/dm3 was studied by means of classical molecular dynamics. Both ions have clear hydration shells. The comparison between radial distribution functions and cumulative numbers of selected atoms around the reference one makes it possible to precisely describe the structure of investigated system. Applying such tools geometrical parameters of the hydrogen bond of the dimer SO42-/H2O have been obtained. 
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2017, 72, 2
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Słabe państwo i solwatacja społeczna w obszarze łączenia pracy z rodzicielstwem
Weak State and Social Solvation in Combining Parenting with Work
Autorzy:
Sarnowska, Justyna
Pustułka, Paula
Wermińska-Wiśnicka, Iga
Powiązania:
https://bibliotekanauki.pl/articles/427361.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
słabe państwo
praktyki rodzinne
mikroracjonalność
solwatacja społeczna
weak state
family practices
micro-rationality
social solvation
Opis:
Celem artykułu jest wyjaśnienie powiązań między trzema poziomami rzeczywistości społecznej związanej z pracą i rodzicielstwem, tj.: makro – polityką państwa i koniunkturą gospodarczą, mezo – strukturą organizacyjną i sieciami społecznymi oraz mikro – indywidualnymi strategiami rodziców-pracowników w łączeniu obowiązków domowych i zawodowych. Proponujemy koncepcję solwatacji społecznej, która ilustruje „rozpuszczanie się” porządku prawnego narzuconego przez państwo w substancji społecznej i powoduje odmienność mikroracjonalnych strategii pracujących rodziców od założeń systemowych. Wskazujemy na sferę mezo, zoperacjonalizowaną jako kultura organizacyjna miejsca pracy i sieci społeczne rodziców. Zastanawiamy się, jakie są wpływy oczekiwań pracodawców i współpracowników na praktyki godzenia obowiązków rodzinnych i zawodowych przez jednostki.
The aim of this article is to explain the links between three levels of social reality connected with work and parenting. These levels are state policy and economy, organizational structures and social networks and individual choices of employed parents concerning the reconciliation of work and family. Adopting the frameworks of weak states, doing family as well as work and life balance (WLB), we argue that it is social solvation that causes differentiated micro-rational strategies of working parents. The analysis combines and contrasts divergent perspectives on work and family. We argue that the mezzo level, i.e. organizational culture of the workplace and parents’ networks, is undervalued in social research. In addition, we showcase the effects of people’s expectations, or social control at the workplace, on the practices of reconciling work and family observed among individuals.
Źródło:
Studia Socjologiczne; 2020, 2(237); 135-162
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Track Effects in Positronium Formation
Autorzy:
Stepanov, S.
Byakov, V.
Duplâtre, G.
Stepanov, P.
Bokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030026.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
positron
positronium
annihilation
ion-electron recombination
solvation
mobility
external electric field
track effects
polar and nonpolar liquids
Opis:
We discuss some aspects important for interpretation of the Ps formation process in liquids and molecular media: (1) inhomogeneity of intratrack reactions and parameters of the e⁺ track, (2) final states of e⁺, its solvation in polar and nonpolar liquids, relation to e⁺ mobility, (3) quasi-neutrality of the e⁺ blob and its ambipolar outdiffusion, (4) appearance of the "in-blob" and "out-of-the-blob" positron fractions, and (5) electric field effect on Ps formation.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1461-1465
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fazy stacjonarne do chromatografii cieczowej z wbudowanymi grupami polarnymi : synteza i właściwości powierzchniowe
Chemically bonded stationary phases with incorporated polar groups for liquid chromatography : the synthesis and surface properties
Autorzy:
Bocian, S.
Krzemińska, K.
Powiązania:
https://bibliotekanauki.pl/articles/171968.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
chromatografia cieczowa
fazy stacjonarne
wbudowane grupy polarne
właściwości powierzchniowe
procesy solwatacyjne
liquid chromatography
stationary phases
polar embedded stationary phases
surface properties
solvation processes
Opis:
In recent years high performance liquid chromatography (HPLC) has gained a dominant position in the life sciences. The widespread use of this technique allows to perform an analysis of compounds which are used in various areas of human life. Currently, there are wide and fully untapped opportunities for synthesis of chromatographic packings with chemically bonded stationary phases. Some of the liquid chromatographic analyses needs the application of water-rich mobile phases (more than 85% water or a buffer). In such condition the performance of hydrophobic stationary phases indicate that the bonded ligands might be collapsing. This problem could be solved by increasing of organic content in the mobile phase which should improve solvation and bring bonded ligands back to the original conformation. To avoid this procedure, which reduces the retention and selectivity of the separation, it is possible to apply stationary phases with incorporated polar groups mixed with the original alkyl ligands (polar embedded stationary phases). Another possibility is to add some polar groups during endcapping procedure (polar end-capped stationary phases). This produces variation in the bonding. Chemically bonded stationary phases which include both hydrophobic and hydrophilic ligands are so-called mixed mode stationary pahses. These materials can be used in reversed phase liquid chromatography (RPLC) and there is also a possibility to use them in hydrophilic interaction liquid chromatography (HILIC). They allow to separate polar and non-polar analytes. Following the idea of green chemistry, especially green analytical chemistry, a series of stationary phases was synthesized. The obtained materials connect polar and hydrophobic groups in the structure of bonded ligands. These specific surface properties provide the stability of the stationary phase in pure water as a mobile phase. Surface properties of novel material were analyzed using various instrumental and chromatographic methods. Finaly, the mixtures of various compounds were applied to test the separation selectivity of stationary phases in various chromatographic system, including purely aqueous conditions.
Źródło:
Wiadomości Chemiczne; 2018, 72, 9-10; 685-701
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical bases of impregnation without pressure of meliorants and the application of their features in practice of fixing mobile sands
Autorzy:
Mirakhmedov, Makhamadjan
Powiązania:
https://bibliotekanauki.pl/articles/1841242.pdf
Data publikacji:
2020
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
sand deflation
consolidation
physic-chemical method
impregnation
protective crust
capillary forces
gravitational forces
solvation layer
humidity
specific consumption
concentration
deflacja piasku
konsolidacja
metoda fizyczno-chemiczna
impregnacja
skorupa ochronna
siły kapilarne
siły grawitacyjne
warstwa solwatacyjna
wilgotność
zużycie właściwe
stężenie
Opis:
Desert sand is subject to deflation, which during the construction and operation of railways in the sandy desert leads to the filling of the railway track with sand and erosion of subgrade. To prevent this phenomenon, the surface of the sand is fixed with a binder, which is sprayed onto a deflated surface. The penetration of the working composition of the binder due to the characteristics of grinding is accompanied by an uneven distribution of the substance, which is proposed to characterize the saturation coefficient. Peculiarities of the interaction of the binder and sand from which the protective crust is formed are revealed, which made it possible to change the nature of the impregnation. Pre-wetting allows to reduce the pore space of sand, change the nature of the transfer of the substance when impregnated into the capillary, and increase the uniformity of impregnation, which as a result allows to obtain a resource-saving solution when fixing the movement of sand.
Źródło:
Transport Problems; 2020, 15, 4, cz. 1; 39-48
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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