Work during 1963 is reported and the work from mid-1960 reviewed on a comprehensive program of thermodynamic and kinetic studies necessary to the theoretical consideration to temperatures of 3000K of the reactions of the zirconium and hafnium carbides and borides with oxygenor halogen-containing atmospheres. ; • Work presented includes: preparation of borides and carbides; low ', temperature he...

A review of the main results from our laboratory for the period 1969—1982 is presented. In the introductory part, allowed and forbidden processes are discussed from the point of view of constants of motion. Specific suggestions are presented as to how to make forbidden processes allowed. In addition to energy forbiddeness, entropy forbiddeness is also mentioned. In the section on equilibria att...

classical xerogels are robust, inexpensive and nontoxic materials with low-ordered nanoporous structures. in water streams where the ph is higher than the point of zero charge, the surface of classical xerogels such as tetraethoxy orthosilan (teos) xerogel is negatively charged. it was assumed that a xerogel can work as a strong adsorbent for metal ions without further modification. therefore, ...

Despite decades of research on the evolution of thermal physiology, at least one fundamental issue remains unresolved: whether the maximal performance of a genotype depends on its optimal temperature. One school argues that warm-adapted genotypes will outperform cold-adapted genotypes because high temperatures inevitably accelerate chemical reactions. Yet another school holds that biochemical a...

Reverse micellar systems are nanofluids with unique properties that make them attractive in high selectivity separation processes, especially for biological compounds. Understanding the phase behavior and thermodynamic properties of these nanosystems is the first step in process design. Separation of components by these nanosystems is performed upon contact of aqueous and reverse micellar phase...

removal of cesium from synthetic aqueous solution through adsorption on vermiculite, under batch equilibrium experimental condition at six initial values of ph (3, 4, 6, 9, 11 and 12) and five temperatures (25, 50, 75, 85 and 95 °c) has been investigated. it is necessary to propose a suitable model for a better understanding of the mechanism of cesium adsorption on vermiculite. for this propose...

introduction with the rapid development of industries such as metal plating facilities, mining, fertilizer producing industries, tanneries and paper industries heavy metals enriched wastewaters are directly or indirectly discharged into the environment. zinc is a trace element that is essential for human health. it is important for the physiological functions of living tissues and regulates man...

almcm-41 was applied for adsorption of methylene blue (mb) and auramine (au) in single and binary component systems. in the single component systems, almcm-41 represents higher adsorption capacity for mb than au with the maximal adsorption capacity of 2.07×10−4 and 1.15×10−4 mol/g at 25 ˚c for mb and au, respectively. in the binary component system, mb and au exhibit competitive adsorption onto...

heavy rainfall is the causes of the crisis. in recent years extreme floods have occurred in the behesht abad basin in chahar mahal and bakhtiar province,iran in 2.10.2006 with a moment discharge of 605m3 .this case study lies in the period of 1984-2010 and is selected for synoptic and thermodynamic condition studies. the meteorologically studied variables and thermodynamic charts indicate poten...