نتایج جستجو برای: enthalpy

تعداد نتایج: 6330  

2015
Szymon Bocian Jan Soukup Pavel Jandera Bogusław Buszewski

Elution and solvation processes in liquid chromatography may be controlled by temperature changes. In the case of solvent adsorption, the temperature influences the amount of adsorbed solvent as well as the enthalpy and entropy of the solvation process. In this work, the thermodynamic parameters of organic solvents used as organic modifiers in the reversed-phase high-performance liquid chromato...

2016
Alfredo A. Ayala-Aponte

Thermodynamic adsorption properties (differential enthalpy and entropy, spreading pressure and net integral enthalpy and entropy) of cassava flour were determined at 25, 30 and 35°C to provide information about the water and energy requirements for the sorption process. The Guggenheim–Anderson–de Boer (GAB), Peleg and Halsey models were found to adequately describe the sorption characteristics,...

2013
Heather A. Murdoch Christopher A. Schuh

Grain boundary segregation provides a method for stabilization of nanocrystalline metals – the selection of an alloying element that will segregate to the boundaries can lower the grain boundary energy, attenuating the driving force for grain growth. The segregation strength, relative to mixing enthalpy, of a binary system determines the propensity for segregation stabilization. This relationsh...

Journal: :Chemosphere 2002
H L Chiang C P Huang P C Chiang

The adsorption of volatile organic compounds (VOCs), exemplified by benzene and methylethylketone (MEK), onto seven different types of activated carbon was investigated. Results show that for benzene adsorption the adsorption characteristic energy, enthalpy, free energy and entropy are in the range 17.12-36.86, -20.8 to -44.7, -11.89 to -16.22 kJ/mole and -29.4 to -85.3 J/mole/K, respectively. ...

Journal: :Material Cycles and Waste Management Research 2014

Journal: :Limnology and Oceanography 1970

Journal: :Methods 2015
Mark K Transtrum Lee D Hansen Colette Quinn

The purposes of this paper are (a) to examine the effect of calorimeter time constant (τ) on heat rate data from a single enzyme injection into substrate in an isothermal titration calorimeter (ITC), (b) to provide information that can be used to predict the optimum experimental conditions for determining the rate constant (k2), Michaelis constant (KM), and enthalpy change of the reaction (ΔRH)...

2013

The engine and its exhaust flow behaviors are investigated in a turbo-charged gasoline direct injection engine under simulated cold-fast-idle condition. The metrics of interest are the exhaust sensible and chemical enthalpy flows, and the exhaust temperature, all of which affect catalyst light off time. The exhaust sensible enthalpy flow is mainly a function of combustion phasing; the exhaust c...

2014
Angus Yeh Jake Boyce-Bacon Mike O’Sullivan

Production wells on deliverability are often used in modelling geothermal fields, especially for simulations of future scenarios. The mass flow rate is calculated by multiplying the productivity index by mobility and the difference between flowing bottom-hole pressure and the reservoir block pressure. Here three options are considered for calculating the bottom-hole pressure: (i) constant, (ii)...

2009
Ericka Figueiredo Alves Rubens Chaves de Oliveira Luis Henrique Mendes da Silva Jorge Luiz Colodette

Thermal and infrared spectroscopic analyzes were carried out in order to study the kind of interaction between the anatomical components of the bleached eucalyptus kraft pulp with offset inks. A Bauer-McNett fiber classifier was used in order to obtain the anatomical components of the pulp, separately. The determinations of the enthalpy of the processes occurring in the samples of inks and pulp...

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