Effect of local environment on stretching parameter in the mixed alkali oxyfluoro vanadate glasses: electrical modulus and structural analysis

Ionics ◽  
2021 ◽  
Author(s):  
Gajanan V Honnavar
Keyword(s):  
Structural Analysis ◽  
Local Environment ◽  
Electrical Modulus ◽  
Mixed Alkali ◽  
Vanadate Glasses

scholarly journals Structural analysis of alkali cations in mixed alkali silicate glasses by 23Na and 133Cs MAS NMR

2014 ◽  
Vol 2 (4) ◽  
pp. 333-338 ◽  
Author(s):  
T. Minami ◽  
Y. Tokuda ◽  
H. Masai ◽  
Y. Ueda ◽  
Y. Ono ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Mas Nmr ◽  
Silicate Glasses ◽  
Alkali Cations ◽  
Mixed Alkali ◽  
Alkali Silicate

scholarly journals Structural Analysis of Mixed Alkali Silicate Melts through 29Si MAS-NMR and Impedance Measurements

2019 ◽  
Vol 59 (11) ◽  
pp. 1956-1965 ◽  
Author(s):  
Yusuke Harada ◽  
Sohei Sukenaga ◽  
Noritaka Saito ◽  
Kunihiko Nakashima
Keyword(s):  
Structural Analysis ◽  
Mas Nmr ◽  
Silicate Melts ◽  
Impedance Measurements ◽  
Mixed Alkali ◽  
Alkali Silicate

Density of mixed alkali borate glasses: A structural analysis

2005 ◽  
Vol 362 (1-4) ◽  
pp. 123-132 ◽  
Author(s):  
H. Doweidar ◽  
G.M. El-Damrawi ◽  
Y.M. Moustafa ◽  
R.M. Ramadan
Keyword(s):  
Structural Analysis ◽  
Borate Glasses ◽  
Mixed Alkali ◽  
Alkali Borate Glasses

Local environment and acidity in alkaline and alkaline-earth exchanged β zeolite: Structural analysis and catalytic properties

2011 ◽  
Vol 142 (2-3) ◽  
pp. 672-679 ◽  
Author(s):  
Dolores Esquivel ◽  
Aurora J. Cruz-Cabeza ◽  
César Jiménez-Sanchidrián ◽  
Francisco J. Romero-Salguero
Keyword(s):  
Structural Analysis ◽  
Alkaline Earth ◽  
Catalytic Properties ◽  
Local Environment ◽  
Β Zeolite

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

Residual Gas Reaction in the Electron Microscope: II The Design of a Gas-Control Chamber for Quantitative Observations

1969 ◽  
Vol 27 ◽  
pp. 82-83
Author(s):  
Chester J. Calbick ◽  
Richard E. Hartman
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Local Environment ◽  
Chamber Pressure ◽  
Objective Lens ◽  
Ion Pump ◽  
Quantitative Studies ◽  
Precise Knowledge ◽  
Differential Pumping ◽  
And Control

Quantitative studies of the phenomenon associated with reactions induced by the electron beam between specimens and gases present in the electron microscope require precise knowledge and control of the local environment experienced by the portion of the specimen in the electron beam. Because of outgassing phenomena, the environment at the irradiated portion of the specimen is very different from that in any place where gas pressures and compositions can be measured. We have found that differential pumping of the specimen chamber by a 4" Orb-Ion pump, following roughing by a zeolite sorption pump, can produce a specimen-chamber pressure 100- to 1000-fold less than that in the region below the objective lens.

An emerging technology: Nuclear magnetic resonance microscopy

1988 ◽  
Vol 46 ◽  
pp. 1000-1001
Author(s):  
M.J. Hennessy ◽  
E. Kwok
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Relaxation Times ◽  
Basic Research ◽  
Local Environment ◽  
Magnetic Resonance Images ◽  
Nmr Microscopy ◽  
Mri Scans ◽  
Temperature Relaxation ◽  
Nuclear Magnetic

Much progress in nuclear magnetic resonance microscope has been made in the last few years as a result of improved instrumentation and techniques being made available through basic research in magnetic resonance imaging (MRI) technologies for medicine. Nuclear magnetic resonance (NMR) was first observed in the hydrogen nucleus in water by Bloch, Purcell and Pound over 40 years ago. Today, in medicine, virtually all commercial MRI scans are made of water bound in tissue. This is also true for NMR microscopy, which has focussed mainly on biological applications. The reason water is the favored molecule for NMR is because water is,the most abundant molecule in biology. It is also the most NMR sensitive having the largest nuclear magnetic moment and having reasonable room temperature relaxation times (from 10 ms to 3 sec). The contrast seen in magnetic resonance images is due mostly to distribution of water relaxation times in sample which are extremely sensitive to the local environment.

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