Authors:Liu Yongjun, Ding Yangjun, Nan Zhaodong, Sun Haitao, and Zhang Honglin
The power-time curves of bacterial growth at different temperatures were determined by using the 2277 Thermal Activity Monitor
(Sweden). From these curves, the growth rate constant (μ) and activation energy (Ea) were calculated. According to the transition state theory of reaction dynamics, the activation entropy (ΔS≠), activation Gibbs free energy (ΔG≠) and equilibrium constant (K≠) of the activation state could be calculated. These results permitted thermodynamic analysis of the bacterial growth metabolism.
Many investigations and researches studied the reaction
ability between high explosive RDX and RDX with other chemicals. However,
accidents still occur and operating problems exist among the RDX manufacturing
process. This study utilized inherent safety concepts and DSC thermal analysis
to assess the incompatible reaction hazards of RDX during usage, handling,
storage, transporting and manufacturing. This assessment includes thermal
curve observations and kinetic evaluations. A decomposition mechanism of the
incompatible reaction is proposed. Among all the contaminants evaluated in
this study, the existence of ferrous chloride tetrahydrate, ferric chloride
hexahydrate and nitric acid shifted the main endothermic and exothermic reactions
of RDX. These contaminants further advanced the exothermic temperature onset
average by about 53, 46 and 61C, respectively. The summarized results
suggest that ferric oxide, ferrous chloride tetrahydrate, ferric chloride
hexahydrate, acetone solution and nitric acid can influence the reaction and
thermokinetic properties of RDX. These chemicals could induce potential hazards
by causing temperature control instability, heating and cooling systems failure,
and produce an unexpected secondary explosion. According to the conclusions
of this study, potential incompatible RDX hazards during usage and manufacturing
could be avoided.
Authors:Ewa Ostrowska-Ligęza, Agata Górska, Magdalena Wirkowska, and Piotr Koczoń
used to study any chemical changes occurring in a processed powder.
The objective of this study was to analyze the phase transitions of ingredients and their influence on the thermokineticproperties of powder milk baby formulas using DSC as
Authors:José Ortiz-Landeros, Tatiana L. Ávalos-Rendón, Carlos Gómez-Yáñez, and Heriberto Pfeiffer
Martinez-dlCruz , L , Pfeiffer , H . Effect of the oxygen addition on the thermokineticproperties of CO 2 chemisorption on Li 2 ZrO 3 . Ind Eng Chem Res . 2010 ; 49 : 9038 – 9042 . 10.1021/ie1005417 .