Ultrasonic speeds of 4-aminobutyric acid in 0.0041,0.0125 and 0.0207 mol·kg^-1 aqueous salbutamol sulphate（SBS） solutions are measured at 308.15,313.15 and 318.15 K.Isentropic compressibility kS,change in isent...Ultrasonic speeds of 4-aminobutyric acid in 0.0041,0.0125 and 0.0207 mol·kg^-1 aqueous salbutamol sulphate（SBS） solutions are measured at 308.15,313.15 and 318.15 K.Isentropic compressibility kS,change in isentropic compressibility△k S,relative change in isentropic compressibility（ △kS /kS^0） ,apparent molal compressibility kφ,limiting apparent molal compressibility kφ^0 ,transfer limiting apparent molal compressibility k φ^0,hydration number nH,pair and triplet interaction parameters kAS,kASS are estimated.The above parameters are used to interpret the solute-solute and solute-solvent interactions of 4-aminobutyric acid in the aqueous salbutamol sulphate solutions.展开更多
Experimental tests have been carried out to evaluate the performance,emission and combustion characteristics of a diesel engine using neat sea lemon oil and its blends of 25%,50%,&75%and standard diesel fuel separ...Experimental tests have been carried out to evaluate the performance,emission and combustion characteristics of a diesel engine using neat sea lemon oil and its blends of 25%,50%,&75%and standard diesel fuel separately.The common problems posed when using vegetable oil in a compression ignition engine are poor atomization,carbon deposits,ring sticking etc.This is because of the high viscosity and low volatility of vegetable oil.When blended with diesel,sea lemon oil presented lower viscosity,improved volatility,better combustion and less carbon deposit.It was found that there was reduction in NO for neat sea lemon oil and its diesel blends along with marginal increase in smoke,HC and CO emissions compared to that of standard diesel.Brake thermal efficiency was slightly lower for neat sea lemon oil and its diesel blends.From the combustion analysis,it was found that sea lemon oil-diesel blends performed better than neat sea lemon oil.展开更多
Density（ρ）and viscosity（η）are measured for glycine,DL-α-alanine DL-α-valine,and DL-α-leucine in 0.05,0.10,0.15 and 0.20 mol·L^-1aqueous metformin hydrochloride at 308.15,313.15 and 318.15 K.The measured ...Density（ρ）and viscosity（η）are measured for glycine,DL-α-alanine DL-α-valine,and DL-α-leucine in 0.05,0.10,0.15 and 0.20 mol·L^-1aqueous metformin hydrochloride at 308.15,313.15 and 318.15 K.The measured values are used to estimate some important parameters,such as partial molal volume Vφ,standard partial molal volume Vφ^0,transfer volume ΔVφ^0,hydration number nH,the second derivative of infinite dilution of partial molal volume with respect to temperature,viz., ^2 Vφ^0 /T^2,viscosity B-coefficient,variation of B with temperature,viz., dB/dT,free energy of activation per mole of solvent Δμ1^＊0 and solute Δμ2^0＊ of the amino acids.These parameters are interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution.In addition,Vφ^0,0 ΔVφ^0,viscosity B-coefficient,ΔB and Δμ2 ^0＊ are split into group contributions（NH3^＋ COO ^-）and -CH2 of the amino acids using their linear correlation and their behavior is discussed.展开更多
文摘Ultrasonic speeds of 4-aminobutyric acid in 0.0041,0.0125 and 0.0207 mol·kg^-1 aqueous salbutamol sulphate（SBS） solutions are measured at 308.15,313.15 and 318.15 K.Isentropic compressibility kS,change in isentropic compressibility△k S,relative change in isentropic compressibility（ △kS /kS^0） ,apparent molal compressibility kφ,limiting apparent molal compressibility kφ^0 ,transfer limiting apparent molal compressibility k φ^0,hydration number nH,pair and triplet interaction parameters kAS,kASS are estimated.The above parameters are used to interpret the solute-solute and solute-solvent interactions of 4-aminobutyric acid in the aqueous salbutamol sulphate solutions.
文摘Experimental tests have been carried out to evaluate the performance,emission and combustion characteristics of a diesel engine using neat sea lemon oil and its blends of 25%,50%,&75%and standard diesel fuel separately.The common problems posed when using vegetable oil in a compression ignition engine are poor atomization,carbon deposits,ring sticking etc.This is because of the high viscosity and low volatility of vegetable oil.When blended with diesel,sea lemon oil presented lower viscosity,improved volatility,better combustion and less carbon deposit.It was found that there was reduction in NO for neat sea lemon oil and its diesel blends along with marginal increase in smoke,HC and CO emissions compared to that of standard diesel.Brake thermal efficiency was slightly lower for neat sea lemon oil and its diesel blends.From the combustion analysis,it was found that sea lemon oil-diesel blends performed better than neat sea lemon oil.
文摘Density（ρ）and viscosity（η）are measured for glycine,DL-α-alanine DL-α-valine,and DL-α-leucine in 0.05,0.10,0.15 and 0.20 mol·L^-1aqueous metformin hydrochloride at 308.15,313.15 and 318.15 K.The measured values are used to estimate some important parameters,such as partial molal volume Vφ,standard partial molal volume Vφ^0,transfer volume ΔVφ^0,hydration number nH,the second derivative of infinite dilution of partial molal volume with respect to temperature,viz., ^2 Vφ^0 /T^2,viscosity B-coefficient,variation of B with temperature,viz., dB/dT,free energy of activation per mole of solvent Δμ1^＊0 and solute Δμ2^0＊ of the amino acids.These parameters are interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution.In addition,Vφ^0,0 ΔVφ^0,viscosity B-coefficient,ΔB and Δμ2 ^0＊ are split into group contributions（NH3^＋ COO ^-）and -CH2 of the amino acids using their linear correlation and their behavior is discussed.
