Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 17 of 17 for “"Arrhenius plots"”.
-
Some Studies on the Purification and the Properties of Monoamine Oxidase
… or on the heat stability, tryptic digestibility, Arrhenius plots or the Deprenil inhibition pattern of MAO A and MAO B. Treatment of the membrane bound enzyme with phospholipase A decreased both the MAO activity by 23% and the overall heat stability of the enzyme; however the tryptic …
-
Measurement of the rate of hydrogen atom abstraction from methane and ethane by muonium
… 626-821 K and 511-729 K respectively. The usual Arrhenius plots for each data set are linear. The measured parameters A are 5.7 [+4.8 superscript and -2.5 subscript] x 10⁻⁸ and 1.0 [+0.7 superscript and -0.4 subscript] x 10⁻⁹ cm³ molecule⁻¹ s⁻¹, and the parameters E [α subscript], 24.66 [+0.88 …
-
CO2 reduction over noble metal/carbon nanotube catalyst
… order dependencies on each reactant. Linear Arrhenius plots of the global rate constants are also obtained. More robust semi-global 3-reaction models are developed based on regressions of experimental gas species concentration data. They adequately simulate observed species concentrations. …
-
Kinetics and mechanism of hydrolysis of trans- dinitrobis(ethylenediamine)cobalt(III) nitrate and related dinitro complexes of cobalt(III) in high concentrations of acids
… and"Constant" are the intercepts, of plots of the left side of eq. 1 or eq. 2 versus the log a<sub>w</sub>. Bunnett proposed that for the hydrolysis of organic compounds, wand w* values are indicative of mechanism. From the constant values of w* obtained in hydrobromic, hydrochloric, …
-
The aqueous aragonite to calcite transformation: rate, mechanisms, and its role in the development of neomorphic fabrics
… and absolute rates were calculated from Arrhenius plots of data from this study and others: E<sub>A</sub>’ Conditions Material Time-50% CAL, 25°C Metzger and Barnard, 1968 58 kJ mol⁻¹ wet cm cubes 2.25X10² yr Taft, 1967 67 wet syn. powder 2.0X10⁻¹ This study 55 wet syn. powder 5.7X10⁻² …
-
Quantification Of Auto-Ignition In Diesel Engines
… by calculating global activation energy using Arrhenius plots with data measured for the ignition delay period (ID). Large variation in the activation energy of fuels has been observed even for fuels with closer CN values. More recently, the activation energy values obtained by Kook et al in …
-
Assessment of copper recovery from leaching of microwave pre-treated tailing from the Otjihase mine
… and hence the dissolution reaction mechanism. Arrhenius plots were used to determine the activation energy, which was calculated to be in the range of 7.7- 22.69kJ/mol. Multiple linear regression revealed that microwave power, leaching time and leaching temperature were related to percentage …
-
Platinum Nanoparticles to Study Metal Location in Shape-Selective Hydrocracking
… analysed using conversion versus temperature plots and Arrhenius plots, primary hydrocracking was then assessed using C4/C12 ratio and once achieved, branched versus linear product selectivity could be compared. Looking at activity, H2O decreased the activity by ~30 °C, which is expected as …
-
Novel reactions on halogen-terminated SI(100)
… energies and prefactors determined from Arrhenius plots indicate a novel reaction pathway that is initiated by the capture of electrons that have been excited by phonon processes into Si-halogen antibonding states. This configuration is on a repulsive potential energy surface, and it is …
-
Synthesis and characterization of precursors for chemical vapor deposition of metal oxide thin films
… Enthalpy of vaporization was calculated from Arrhenius plots of vapor pressure as a function of temperature. The Zr(thd)₄ and T8 were observed to be thermally stable over the temperature ranges and durations of experiments. The Pb(thd)₂ and Pb(fod)₂ are not thermally stable over the …
-
Physical characteristics of laser processed hydrogenated amorphous silicon
… tools to help elucidate the internal structure. Arrhenius plots acquired from conductivity measurements demonstrates a decrease in activation energy from 0.8957 eV from original sample to 0.3955 and 0.1727 eV for HE and LE sample respectively. Analysis also showed an agreement with Meyer Neldel …
-
Reliability Studies of TiN/Hf-Silicate Based Gate Stacks
… Activation energy of bond-breakage, found from Arrhenius plots of 63% failure value of TBD, shows that IL degradation triggers gate stacks BD, and the wear-out during TDDB.
-
High-Throughput Synthesis of Metal–Organic Frameworks in a Continuous Flow Reactor
… model. The activation energies obtained using Arrhenius plots for nucleation (Eₐ(N)) and growth (Eₐ (G)) are 64.7 ± 4 kj mol⁻¹ and 59.2 ± 5 kj mol⁻¹ respectively. The use of higher flow rates at the same residence time and temperature resulted in higher crystal sizes with a narrow CSD—a simpler …
-
Caldolase: an alkaline serine protease from Thermus strain TOK₃
… binding to the active site of the enzyme. The Arrhenius plots for both casein and peptide substrates were curved, but without any clearly marked discontinuity. It is concluded that the effect of temperature on the enzyme conformation is continuous rather than occurring at a particular …
-
Quantum transport in magnetic topological insulators
… TI films. The activation energy extracted from Arrhenius plots of longitudinal resistance versus temperature is $\sim$ 4 \textmu eV (i.e. $\sim$ 47 mK). Such a small energy scale implies that the Fermi level is far away from the centre of the magnetic gap and the bulk conduction may dominate the …
-
NEW GO- AND RGO-BASED MORALS AND CARBENE-FUNCTIONALIZED GOLD NANOPARTICLES FOR HETEROGENEOUSLY CATALYZED REDUCTIONS
… of surface species. Kinetic analyses, including Arrhenius plots and reaction order determination, were performed to highlight differences between the unfunctionalized and NHC functionalized catalysts. These experiments provided insight into how the presence of the organic ligand modifies the …
-
An extracellular protease from an extreme thermophile
… above this temperature denaturation occurred. Arrhenius plots showed a break at about 50°C, above which a reduction in activation energy occurred. The Kₘ at 40°C was considerably higher than that at either 65°C or 85°C. Caldolysin is one of the most stable enzymes known. Thermostability was …