نتایج جستجو برای: solute
تعداد نتایج: 17241 فیلتر نتایج به سال:
Electric field-resolved transient grating measurements are used to distinguish the four-wave mixing signal emission from a resonant solute and a non-resonant solvent. The two components of the solution (i.e., solute and solvent) emit signal fields at different times with respect to the arrival of the probe pulse to the sample. This gives rise to a recurrence in the temporal profile of the total...
This paper investigates the effect of solute (namely Zr, Fe and Si) in Al alloys on grain boundary character and mobility based on experiments in which individual boundaries migrate under a stored energy driving pressure acquired from prior plastic strain. A compensation effect is noted both alloys studied with respect to both temperature and solute content. As supported by the literature, boun...
The mechanism of displacement washing of packed bed of porous, compressible and cylindrical particles, e.g., fibers, is presented with the help of an axial dispersion model involving Peclet number (Pe) and Biot number (Bi). Bulk fluid concentration, intra-pore solute concentration and concentration of solute adsorbed on the fiber surface are taken to be the function of washing time and position...
Quantitative nuclear magnetic resonance was used to measure the freezing behaviour of lamellar phases of phosphatidylcholine in water and in solutions of sorbitol. Both solute and solvent were deuterated in different series of experiments to allow the calculation of the partitioning of solute and solvent molecules between the lamellar phase and unfrozen bulk solution. Sorbitol, as well as water...
Accurate assessment of the fate of salts, nutrients, and pollutants in natural, heterogeneous soils requires a proper quantification of both spatial and temporal solute spreading during solute movement. The number of experiments with multisampler devices that measure solute leaching as a function of space and time is increasing. The breakthrough curve (BTC) can characterize the temporal aspect ...
Recent studies showed that salicylic acid (SA) and nitric oxide (NO) functions as an essential endogenous plant signal molecule. In this study, the regulatory role of NO and SA during the flower senescence of Polianthes tuberosa L. was surveyed. Exogenous application of the NO donor sodium nitroprusside (SNP) and SA could delay flower senescence processes. The flowers were cut and kept in a vas...
The objective of this work is to develop a new class of nanocomposite ultrafiltration (UF) membranes with excellent solute rejection rate and superior water flux using zeolitic imidazolate framework-8 (ZIF-8) and multi-walled carbon nanotubes (MWCNTs). The effect of ZIF-8 and MWCNTs loadings on the properties of polyvinyldifluoride (PVDF)-based membrane were investigated by introducing respecti...
A theoretical study at the B3LYP/6-31++G(d,p) level was performed on the tatumerization of 7H-purine-2, 6-diamine into 9H-purine-2, 6-diamine. Such a tautomerism can take place via three different pathways namely A, B, and C. The energetic results associated with the gas phase reveal that pathways A, B, and C display a very high activation Gibbs free energy of 45.1, 68.6 and 48.9 kcal/mol, resp...
Densities ρ and Viscosities ŋ of D-Galactose D-Maltose (0.05-0.4)M in aqueous solution (0.25) M Na2S at 298.15, 303.15 308.15K have been measured. From these experimental data, apparent molal Volume Limiting Apparent Molal ( ) ,The slope , Jones-Dole coefficient A B, The free energy activation viscous flow (ΔG*), enthalpies (ΔH*) Entropies (ΔS*) were calculated, values compatible with the weak ...
The entire ultraviolet-visible absorption spectrum of benzophenone in water is studied and compared with the same spectrum in gas phase. Five transitions are considered, and the corresponding solvatochromic shifts are obtained and compared to experiment. Using a sequential procedure of Monte Carlo simulations and quantum mechanical calculations, liquid configurations were generated and an avera...
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