2-Isoxazolidineethanols: An NMR study of the effect of intramolecular H-bonding on the population of nitrogen invertomers and inversion process

2008 ◽  
Vol 70 (3) ◽  
pp. 482-490 ◽  
Author(s):  
Shaikh A. Ali ◽  
Muhammad Z.N. Iman ◽  
Mohamed I.M. Wazeer ◽  
Mohammed B. Fettouhi
Keyword(s):  
Inversion Process ◽  
Nmr Study ◽  
And Inversion

On the geometry and inversion process of PF3+· (X̃ 2A1)

1997 ◽  
Vol 273 (3-4) ◽  
pp. 199-204 ◽  
Author(s):  
Steven Creve ◽  
Minh Tho Nguyen
Keyword(s):  
Inversion Process ◽  
And Inversion

Synthetic seismogram in depth domain based on the forward and inversion process of wave equation

2018 ◽  
Author(s):  
Zhang Hongjing ◽  
Liu Chaoying ◽  
Wang Xuehui ◽  
Tian Zhenpin ◽  
Huang Na
Keyword(s):  
Wave Equation ◽  
Synthetic Seismogram ◽  
Inversion Process ◽  
And Inversion

Investigation of Optimal Wavenumber Range and Resolution for Determination of Combustion Gas Temperature and Concentration

2013 ◽  
Author(s):  
Tao Ren ◽  
Todd A. Reeder ◽  
Michael F. Modest
Keyword(s):  
Optimal Parameters ◽  
Gas Temperature ◽  
Inversion Process ◽  
Combustion Gas ◽  
Nonhomogeneous Media ◽  
Multiple Factors ◽  
Wavenumber Range ◽  
And Inversion ◽  
Spectral Database

An inverse radiation algorithm was developed to reconstruct temperature and species concentrations from a homogeneous gas column to determine the optimal wavenumber range and resolution for such reconstruction. By minimizing the error between calculated and measured transmissivity spectra, temperature and species concentrations are deduced as results of the inversion process. The error is minimized while considering multiple factors, including spectral region, spectral resolution, temperature and concentration range, and susceptibility to measurement drift (systematic error) and noise (random error). Results are obtained for homogeneous mixtures containing CO2, H2O or CO with N2. Measured spectra were synthesized through calculations from HITEMP2010, the high-temperature spectral database. These optimal parameters can be further used for guiding experiment and inversion of gas temperature and concentration in nonhomogeneous media.

The Fine Structure of the Sheath of Volvox Carteri f. Weismannia

1977 ◽  
Vol 35 ◽  
pp. 346-347
Author(s):  
Regina Birchem
Keyword(s):  
Developmental Stages ◽  
Ruthenium Red ◽  
Sulfated Polysaccharides ◽  
Volvox Carteri ◽  
High Voltage Electron Microscopy ◽  
Ultrastructural Studies ◽  
Voltage Electron ◽  
Sheath Formation ◽  
And Inversion ◽  
Sheath Material

Spheroids of the green colonial alga Volvox consist of biflagellate Chlamydomonad-like cells embedded in a transparent sheath. The sheath, important as a substance through which metabolic materials, light, and the sexual inducer must pass to and from the cells, has been shown to have an ordered structure (1,2). It is composed of both protein and carbohydrate (3); studies of V. rousseletii indicate an outside layer of sulfated polysaccharides (4).Ultrastructural studies of the sheath material in developmental stages of V. carteri f. weismannia were undertaken employing variations in the standard fixation procedure, ruthenium red, diaminobenzidine, and high voltage electron microscopy. Sheath formation begins after the completion of cell division and inversion of the daughter spheroids. Golgi, rough ER, and plasma membrane are actively involved in phases of sheath synthesis (Fig. 1). Six layers of ultrastructurally differentiated sheath material have been identified.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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