Experimental Characterization of the Higher Vibrationally Excited States of HCO+: Determination of ω2, x22, g22, and B(030)

2000 ◽  
Vol 199 (2) ◽  
pp. 147-157 ◽  
Author(s):  
Robert J. Foltynowicz ◽  
Jason D. Robinson ◽  
Eric J. Zückerman ◽  
Hartmut G. Hedderich ◽  
Edward R. Grant
Keyword(s):  
Excited States ◽  
Experimental Characterization ◽  
Vibrationally Excited

Determination of a High Potential Barrier Hindering Internal Rotation in 2-Methylcyclopentanone and α-Methyl-γ-Butyrolactone by Microwave Fourier Transform Spectroscopy

1992 ◽  
Vol 47 (6) ◽  
pp. 761-764 ◽  
Author(s):  
J. L. Alonso ◽  
N. Heineking ◽  
H. Dreizler ◽  
N. Heineking ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Internal Rotation ◽  
Excited States ◽  
Fourier Transform Spectroscopy ◽  
Vibrationally Excited ◽  
Methyl Group ◽  
Internal Rotation Barrier ◽  
High Potential Barrier ◽  
Method Analysis

AbstractThe microwave spectra of α-methyl-γ-butyrolactone and 2-methylcyclopentanone have been reinvestigated using microwave Fourier transform spectroscopy. A-E splittings due to internal rotation of the methyl group have been observed in the ground and several vibrationally excited states for both molecules. From an internal-axis-method analysis of these splittings, values of the methyl group internal rotation barrier of 2.61 kcal mol-1 for α-methyl-γ-butyrolactone and 2.41 kcal mol-1 for 2-methylcyclopentanone have been obtained.

scholarly journals Multicomponent Materials to Improve Solubility: Eutectics of Drug Aminoglutethimide

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 40
Author(s):  
Basanta Saikia ◽  
Andreas Seidel-Morgenstern ◽  
Heike Lorenz
Keyword(s):  
Melting Point ◽  
Molar Ratio ◽  
Experimental Characterization ◽  
X Ray ◽  
Eutectic Mixtures ◽  
Ft Ir ◽  
Aqueous Solubilities ◽  
Ft Ir Spectroscopy

Here, we report the synthesis and experimental characterization of three drug-drug eutectic mixtures of drug aminoglutethimide (AMG) with caffeine (CAF), nicotinamide (NIC) and ethenzamide (ZMD). The eutectic mixtures i.e., AMG-CAF (1:0.4, molar ratio), AMG-NIC (1:1.9, molar ratio) and AMG-ZMD (1:1.4, molar ratio) demonstrate significant melting point depressions ranging from 99.2 to 127.2 °C compared to the melting point of the drug AMG (151 °C) and also show moderately higher aqueous solubilities than that of the AMG. The results presented include the determination of the binary melt phase diagrams and accompanying analytical characterization via X-ray powder diffraction, FT-IR spectroscopy and scanning electron microscopy.

scholarly journals Multicomponent Materials to Improve Solubility: Eutectics of Drug Aminoglutethimide

2021 ◽  
Author(s):  
Basanta Saikia ◽  
Andreas Seidel-Morgenstern ◽  
Heike Lorenz
Keyword(s):  
Melting Point ◽  
Experimental Characterization ◽  
Analytical Characterization ◽  
X Ray ◽  
Eutectic Mixtures ◽  
Ft Ir ◽  
Aqueous Solubilities ◽  
Ft Ir Spectroscopy

Here, we report the synthesis and experimental characterization of three drug-drug eutectic mixtures of drug aminoglutethimide (AMG) with caffeine (CAF), nicotinamide (NIC) and ethenzamide (ZMD). The eutectic mixtures (AMG-CAF, AMG-NIC and AMG-ZMD) demonstrate significant melting point depressions ranging from 99.2 to 127.2 °C compared to the melting point of the drug AMG (151°C) and also show significantly higher aqueous solubilities than that of the AMG. The results presented include the determination of the binary melt phase diagrams and accompanying analytical characterization via X-ray powder diffraction, FT-IR spectroscopy and Scanning electron microscopy.

Experimental Characterization of Contact Hysteresis at High Temperatures

2006 ◽  
Author(s):  
Sergio Filippi ◽  
Esequiel B. Rodrigues ◽  
Muzio M. Gola
Keyword(s):  
Friction Coefficient ◽  
Experimental Determination ◽  
Measurement System ◽  
Experimental Characterization ◽  
Test Rig ◽  
Tangential Load ◽  
Wide Range ◽  
Induction System

The current paper presents a measurement system for the experimental determination of contact hysteresis cycles at temperatures up to 800° C. A test rig was designed to conduct experiments in a wide range of temperatures, with different combinations of normal and tangential load, frequencies and contacting materials. An induction system supplies the heat for measurements of hysteresis cycles at the required temperatures. Measurements show the dependence of the friction coefficient on temperature.

An application of CaTraSys, a cable-based parallel measuring system for an experimental characterization of human walking

Robotica ◽  
2009 ◽  
Vol 28 (1) ◽  
pp. 119-133 ◽  
Author(s):  
Erika Ottaviano ◽  
Marco Ceccarelli ◽  
Francesco Palmucci
Keyword(s):  
Parallel Manipulator ◽  
Tracking System ◽  
Experimental Results ◽  
Measuring System ◽  
Human Walking ◽  
Experimental Characterization ◽  
Experimental Identification ◽  
Human Limb

SUMMARYIn this paper, an application is presented of a cable-based parallel manipulator as measuring system for an experimental identification of human walking characteristics. Experimental results have been obtained by means of a new version of CaTraSys (Cassino Tracking System), which is a measuring system that has been designed and built at Laboratory of Robotics and Mechatronics (LARM) in Cassino, Italy. The new version of the CaTraSys system has been used to determine the trajectory of the human limb extremity during walking operation and furthermore the system is able to measure forces that are exerted by a limb. Experimental determination of articulation mobility is also presented with numerical and experimental results.

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