Identification and Characterization of Phase Transformations by the Resistivity Measurements in Mg-RE-Mn Alloys

2008 ◽  
Vol 138 ◽  
pp. 57-62 ◽  
Author(s):  
Ivana Stulíková ◽  
Bohumil Smola
Keyword(s):  
Phase Transformations ◽  
Isochronal Annealing ◽  
Gaussian Functions ◽  
Resistivity Measurements ◽  
Temperature Ranges ◽  
Relative Resistivity ◽  
Derivatives Of ◽  
Identification And Characterization

The response of the relative resistivity changes to the isochronal annealing was measured in MgSc, MgScMn and MgYNdScMn alloys. The derivatives of the annealing curves were fitted by Gaussian functions to determine and separate the temperature ranges of the phase transformations taking place. The Austin-Rickett kinetics is argued to justify this procedure for diffusion driven transformations. TEM observation verified the conclusions drawn from the procedure.

scholarly journals Interactions of Cannabinoids With Biochemical Substrates

2017 ◽  
Vol 11 ◽  
pp. 117822181771141 ◽  
Author(s):  
Brian F Thomas
Keyword(s):  
Cannabinoid Receptors ◽  
Cannabis Sativa ◽  
Synthetic Cannabinoids ◽  
Receptor Ligands ◽  
Anatomical Distribution ◽  
Synthetic Receptor ◽  
Challenges And Opportunities ◽  
Derivatives Of ◽  
Identification And Characterization

Recent decades have seen much progress in the identification and characterization of cannabinoid receptors and the elucidation of the mechanisms by which derivatives of the Cannabis sativa plant bind to receptors and produce their physiological and psychological effects. The information generated in this process has enabled better understanding of the fundamental physiological and psychological processes controlled by the central and peripheral nervous systems and has fostered the development of natural and synthetic cannabinoids as therapeutic agents. A negative aspect of this decades-long effort is the proliferation of clandestinely synthesized analogs as recreational street drugs with dangerous effects. Currently, the interactions of cannabinoids with their biochemical substrates are extensively but inadequately understood, and the clinical application of derived and synthetic receptor ligands remains quite limited. The wide anatomical distribution and functional complexity of the cannabinoid system continue to indicate potential for both therapeutic and side effects, which offers challenges and opportunities for medicinal chemists involved in drug discovery and development.

Identification and characterization of chemically masked derivatives of pseudoephedrine, ephedrine, methamphetamine, and MDMA

2020 ◽  
Vol 12 (4) ◽  
pp. 524-537 ◽  
Author(s):  
Alexandra Mayer ◽  
Brent Copp ◽  
Ben Bogun ◽  
Gordon Miskelly
Keyword(s):  
Derivatives Of ◽  
Identification And Characterization

Electronic Transport Characterization of BiVO4 Using AC Field Hall Technique

2014 ◽  
Vol 1633 ◽  
pp. 43-49
Author(s):  
Jeffery Lindemuth ◽  
Alexander J. E. Rettie ◽  
Luke G. Marshall ◽  
Jianshi Zhou ◽  
C. Buddie Mullins
Keyword(s):  
Electronic Transport ◽  
Small Polaron ◽  
Absolute Temperature ◽  
Polaron Hopping ◽  
Polaron Model ◽  
Resistivity Measurements ◽  
Temperature Ranges ◽  
Hall Effect Measurements ◽  
Image Position

ABSTRACTBismuth vanadate (BiVO4) is a photoelectrode for the oxidation of water. It is of fundamental importance to understand the electrical and photoelectrochemical properties of this material. In metal oxides, the electronic transport is described by the small polaron model, first described by Mott. In this model, the resistivity varies with temperature as $\rho \,\left( T \right)\, \propto \,Te^{({{E_a } \mathord{\left/ {\vphantom {{E_a } {(k_B T))}}} \right. \kern-\nulldelimiterspace} {(k_B T))}}} $, where Ea is the hopping activation energy, kB is the Boltzmann constant and T is the absolute temperature. Resistivity measurements confirm that small polaron hopping dominates in temperature ranges from 250 K to 300 K. In addition measurements from 175K to 250K show the variable range hopping dominates the transport. To this end, the electronic transport properties of BiVO4 single crystal were characterized using resistivity measurements and Hall effect measurements over temperatures ranging from 175 K to 300 K.

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