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...

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. ...

In the first part of the paper the relative stabilities of the different martensitic phases, mainly in Cu-Zn-Al, are compared. It is shown that the differences in enthalpy of formation between the fcc type 3R or 6R and the 9R, 18R or 2H structures are above all due to a lattice distortion which reduces the energy per stacking fault, considering 9R, I8R and 2H as a basic face centered lattice in...

Two criticisms which are frequently advanced to counter observations of the generation of excess enthalpy in the cathodic polarisations of Pd-based electrodes in D2O-based electrolytes (e.g. see (1), (2)) are usually based on the assertion that the isoperibolic calorimeters used in these studies are imprecise and inaccurate. Furthermore, any excess enthalpy generation is then attributed to the ...

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)...

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)...

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...