Measurement and Correlation of Solubility of Fructose Diphosphate Sodium in Ethanol + Water Mixtures

2014 ◽  
Vol 614 ◽  
pp. 65-69
Author(s):  
Yan Fei Wang ◽  
Yu Xiang Zhu ◽  
Xiao Yu Zhao ◽  
Shi Jie Xu ◽  
Lin Shan Hu ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Empirical Models ◽  
Binary Solvent ◽  
Experimental Solubility Data ◽  
Laser Monitoring ◽  
Experimental Solubility ◽  
Experimental Values ◽  
Semi Empirical ◽  
Laser Monitoring Observation Technique ◽  
Good Agreement

Using a laser monitoring observation technique, the solubility of fructose diphosphate sodium in binary solvent of ethanol + water mixtures was experimentally measured in the temperature ranging from 298.15 K to 333.15 K at atmospheric pressure. The solubility of fructose diphosphate sodium increased with an increase of temperature and quality percentage of water. Experimental solubility data were correlated with semi-empirical models; and the calculated solubilities of fructose diphosphate sodium show good agreement with the experimental values.

scholarly journals DFT calculation and assignment of vibrational spectra of aryl and alkyl chlorophosphates

2014 ◽  
Vol 12 (2) ◽  
pp. 153-163
Author(s):  
Viktor Anishchenko ◽  
Vladimir Rybachenko ◽  
Konstantin Chotiy ◽  
Andrey Redko
Keyword(s):  
Vibrational Spectra ◽  
Basis Sets ◽  
Heavy Atoms ◽  
Wide Range ◽  
Complete Assignment ◽  
Key Factor ◽  
Polarization Functions ◽  
Experimental Values ◽  
Semi Empirical ◽  
Good Agreement

AbstractDFT calculations of vibrational spectra of chlorophosphates using wide range of basis sets and hybrid functionals were performed. Good agreement between calculated and experimental vibrational spectra was reached by the combination of non-empirical functional PBE0 with both middle and large basis sets. The frequencies of the stretching vibrations of the phosphate group calculated using semi-empirical functional B3LYP for all basis sets deviate significantly from the experimental values. The number of polarization functions on heavy atoms was shown to be a key factor for the calculation of vibrational frequencies of organophosphates. The importance of consideration of all the stable rotamers for a complete assignment of fundamental modes was shown.

Ignition and Flame Propagation in Oxy-Methane Mixtures Diluted With CO2

2015 ◽  
Author(s):  
Bader Almansour ◽  
Luke Thompson ◽  
Joseph Lopez ◽  
Ghazal Barari ◽  
Subith S. Vasu
Keyword(s):  
Flame Propagation ◽  
Atmospheric Pressure ◽  
High Speed ◽  
Dynamic Pressure ◽  
Burning Velocity ◽  
Reaction Rates ◽  
Current Data ◽  
Initiation And Propagation ◽  
Experimental Values ◽  
Good Agreement

Ignition and flame propagation in methane/O2 mixtures diluted with CO2 are studied. A laser ignition system and dynamic pressure data are utilized to ignite the mixture and to record the combustion pressure, respectively. The laminar burning velocities (LBV) are obtained at room temperature and atmospheric pressure in a spherical combustion chamber. Flame initiation and propagation is recorded by using a high-speed camera in select experiments to visualize the effect of CO2 proportionality on the combustion behavior. The laminar burning velocity is studied for a range of equivalence ratios (ϕ =0.8–1.3, in steps of 0.1), and oxygen ratios, D=O2/(O2+CO2) (26–38% by volume). It was found that the LBV decreases by increasing the CO2 proportionality. It was observed that the flame propagates toward the laser at a faster rate as the CO2 proportionality increases. Current experiments are in very good agreement with existing literature data. The premixed flame model from CHEMKIN PRO [1] software and two mechanisms (GRI-Mech 3.0 [2] and ARAMCO Mech 1.3 [3]) are used to simulate the current data. In general, simulations are in reasonable agreement with current data though the mechanisms predict slower flame speeds. The LBV values obtained by the ARAMCO 1.3 mechanism are closer to the experimental values. Additionally, sensitivity analysis is carried out to understand the important reactions that influence the predicted flame speeds. Improvements to the GRI predictions are suggested after incorporating latest reaction rates from literature for key reactions.

Alpha particle preformation factor of spherical nuclei for 67 ≤Z ≤91

2019 ◽  
Vol 34 (05) ◽  
pp. 1950039 ◽  
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
Dashty T. Akrawy
Keyword(s):  
Alpha Particle ◽  
Scaling Law ◽  
Analytical Formula ◽  
Theoretical Models ◽  
Alpha Decay ◽  
Proximity Potential ◽  
Spherical Nuclei ◽  
Experimental Values ◽  
Semi Empirical ◽  
Good Agreement

In this paper, alpha decay half-lives of spherical nuclei in the range [Formula: see text] are studied by considering the Coulomb and proximity potential model (CPPM) and calculating the alpha particle preformation factor. Comparisons are made to existing data in the literature. The half-lives are compared to the experimental values and also with the existing theoretical models, the analytical formula of Royer (R) and also within the modified analytical formula of Royer (MR) and New Akrawy–Poenaru Formula (AKRE) by Akrawy and Poenaru and the semi-empirical model based on fission theory (SemFIS) of Poenaru et al., the Universal Decay Law (UDL) of Qi et al., the Scaling Law of Brown (SLB), the Scaling Law of Horoi et al. (SLH). Compared with the experimental alpha half-lives, it can be found that the half-lives obtained using our formalism is in good agreement with the experimental data.

Solubility of Stearic Acid in Ethanol, 1-Propanol, 2-Propanol, L-Butanol, Acetone, Methylene Chloride, Ethyl Acetate and 95% Ethanol from (293 to 315) K

2012 ◽  
Vol 550-553 ◽  
pp. 71-74
Author(s):  
Wen Ju Liu ◽  
Chen Sun ◽  
Pei Xia Zhao ◽  
Shao Feng Wang
Keyword(s):  
Stearic Acid ◽  
Ethyl Acetate ◽  
Methylene Chloride ◽  
Liquid Mixture ◽  
Solid Phase ◽  
Synthetic Method ◽  
Laser Monitoring ◽  
Solid Liquid ◽  
Semi Empirical ◽  
Laser Monitoring Observation Technique

Solubility of stearic acid in ethanol, 1-propanol, 2-propanol,l-butanol, acetone, methylene chloride, ethyl acetate and 95% ethanol was experimentally determined by the synthetic method from (293 to 315)K. The laser monitoring observation technique was used to determine the disappearance of the solid phase in a solid + liquid mixture. The solubility of stearic acid in methylene chloride was found to be the highest, and the value in 95% ethanol was the lowest. Results are correlated by semi-empirical equations, which show a good fit to the experimental data.

scholarly journals Measurement and Correlation for Solubility of Some Pyrimidine Derivatives in Different Solvents

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Kapil Bhesaniya ◽  
Shipra Baluja
Keyword(s):  
Atmospheric Pressure ◽  
Solubility Data ◽  
Dissolution Enthalpy ◽  
Mass Spectral Data ◽  
Pyrimidine Derivatives ◽  
Mass Spectral ◽  
Apelblat Equation ◽  
Modified Apelblat Equation ◽  
Experimental Solubility Data ◽  
Experimental Solubility

Some new pyrimidine derivatives have been synthesized and their characterization was done by IR, NMR, and mass spectral data. The solubility of these synthesized compounds has been studied in methanol, N,N dimethylformamide (DMF), and carbon tetrachloride (CCl4) by gravimetrical method from 298.15 to 328.15 K under atmospheric pressure and the solubility data were correlated against temperature. The solubility is found to increase with temperature and order of solubility is DMF > methanol > CCl4. The experimental solubility data is correlated with the modified Apelblat equation. Some thermodynamic parameters such as dissolution enthalpy, Gibbs energy of dissolution, and entropy of mixing have also been calculated.

The instability of capillary jets

1975 ◽  
Vol 68 (3) ◽  
pp. 477-495 ◽  
Author(s):  
Arthur M. Sterling ◽  
C. A. Sleicher
Keyword(s):  
Velocity Profile ◽  
Surrounding Medium ◽  
Aerodynamic Interaction ◽  
The Difference ◽  
Capillary Jets ◽  
Experimental Values ◽  
Semi Empirical ◽  
Axisymmetric Disturbances ◽  
Laminar Pipe Flow ◽  
Good Agreement

At high jet velocity the aerodynamic interaction between a capillary jet and the surrounding medium leads to an enhanced growth rate of axisymmetric disturbances. The available theories which account for this effect fail to agree with experimental observations. The difference is attributed, in part, to the relaxation of the velocity profile in jets formed by fully developed laminar pipe flow. The profile relaxation has a destabilizing effect just as does the aerodynamic interaction. In the absence of velocity-profile relaxation it is shown that the available theories overestimate the aerodynamic effect. A consideration of the viscosity of the ambient fluid yields a semi-empirical modification to the theory which shows good agreement with experimental values.

scholarly journals Solubilization and thermodynamic properties of simvastatin in various micellar solutions of different non-ionic surfactants: Computational modeling and solubilization capacity

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0249485
Author(s):  
Faiyaz Shakeel ◽  
Sultan Alshehri ◽  
Mohamed A. Ibrahim ◽  
Mohammad Altamimi ◽  
Nazrul Haq ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Tween 80 ◽  
Tween 20 ◽  
Ionic Surfactants ◽  
Micellar Solutions ◽  
Solubilization Capacity ◽  
Brij 35 ◽  
Brij 58 ◽  
Experimental Solubility Data ◽  
Experimental Solubility

The aim of this work was to solubilize simvastatin (SIM) using different micellar solutions of various non-ionic surfactants such as Tween-80 (T80), Tween-20 (T20), Myrj-52 (M52), Myrj-59 (M59), Brij-35 (B35) and Brij-58 (B58). The solubility of SIM in water (H2O) and different micellar concentrations of T80, T20, M52, M59, B35 and B58 was determined at temperatures T = 300.2 K to 320.2 K under atmospheric pressure p = 0.1 MPa using saturation shake flask method. The experimental solubility data of SIM was regressed using van’t Hoff and Apelblat models. The solubility of SIM (mole fraction) was recorded highest in M59 (1.54 x 10−2) followed by M52 (6.56 x 10−3), B58 (5.52 x 10−3), B35 (3.97 x 10−3), T80 (1.68 x 10−3), T20 (1.16 x 10−3) [the concentration of surfactants was 20 mM in H2O in all cases] and H2O (1.94 x 10−6) at T = 320.2 K. The same results were also recorded at each temperature and each micellar concentration of T80, T20, M52, M59, B35 and B58. “Apparent thermodynamic analysis” showed endothermic and entropy-driven dissolution/solubilization of SIM in H2O and various micellar solutions of T80, T20, M52, M59, B35 and B58.

scholarly journals Voltage dependent models of the formative time delay in argon

2017 ◽  
Vol 15 (2) ◽  
pp. 81-93
Author(s):  
Suzana Stamenkovic ◽  
Vidosav Markovic ◽  
Aleksandar Jovanovic ◽  
Marjan Stankov
Keyword(s):  
Experimental Data ◽  
Data Analysis ◽  
Time Delay ◽  
Breakdown Voltage ◽  
Empirical Models ◽  
Formative Time ◽  
Voltage Dependent ◽  
Semi Empirical ◽  
Empirical Corrections ◽  
Good Agreement

Measurements of the formative time delay tf at different working voltages U in argon at low pressure are presented. The well-known decreasing voltage behavior of the formative time delay is theoretically described by different empirical and semi-empirical models. In addition to the introduced empirical models, some models from the literature are applied to elucidate experimentally obtained tf (U) dependence. However, the models from the literature show a good agreement with the experimental data only at low overvoltages ?U(?U=U-Us where Us is the static breakdown voltage). Therefore, empirical corrections are made based on data analysis, and good compatibility is achieved in a whole range of working voltages.

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