Determination of Exact Positions of Individual Tungsten Atoms in Unisize Tungsten Oxide Clusters Supported on Carbon Substrate by HAADF-STEM Observation

2014 ◽  
Vol 118 (3) ◽  
pp. 1706-1711 ◽  
Author(s):  
Hisato Yasumatsu ◽  
Tetsuya Tohei ◽  
Yuichi Ikuhara
Keyword(s):  
Tungsten Oxide ◽  
Carbon Substrate ◽  
Exact Positions

Graphenated polyaniline-doped tungsten oxide nanocomposite sensor for real time determination of phenanthrene

2014 ◽  
Vol 128 ◽  
pp. 138-148 ◽  
Author(s):  
Oluwakemi Tovide ◽  
Nazeem Jaheed ◽  
Nurali Mohamed ◽  
Ezo Nxusani ◽  
Christopher E. Sunday ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Real Time ◽  
Time Determination ◽  
Nanocomposite Sensor

Differentiation of enterobacteriaceae and vibrionaceae by a micromethod for determination of carbon substrate assimilation

1984 ◽  
Vol 258 (2-3) ◽  
pp. 187-197 ◽  
Author(s):  
Jean Freney ◽  
Pierre Laban ◽  
Mireille Desmonceaux ◽  
Jean-Pierre Gayral ◽  
Jean Fleurette
Keyword(s):  
Carbon Substrate

scholarly journals CONTACT ANGLE OF COAL WETTING WITH WATER

2021 ◽  
Vol 1 ◽  
pp. 4-10
Author(s):  
V.M. Kuznichenko ◽  
A.V. Sytnik
Keyword(s):  
Contact Angle ◽  
Moisture Content ◽  
Correlation Coefficient ◽  
Practical Importance ◽  
Polished Surface ◽  
Reasonable Assumption ◽  
Carbon Substrate ◽  
Organic Mass ◽  
Contact Angle Of Wetting

It is known that in the process of coking a compacted coal charge during its ramming in an industrial ramming-loading-pushing machine, the moisture of the charge plays the role of a compaction agent. On the basis of this, the authors put forward a reasonable assumption that the higher the ability of coal grains to hydration, the stronger the contact between them and, accordingly, the greater the density of the formed rammed coal cake. Therefore, the determination of the ability to hydrate the surface of coal used in the charge for ramming is of both theoretical and practical importance. For the numerical determination of this indicator, the authors have chosen the contact angle of wetting, determined by the method of "sessile drop" of water on a carbon substrate. The article presents the results of a study of the ability of various brands of coal to hydrate. The article describes the characteristics of the studied grades of coal and their contact angle of wetting with water (Ɵ) after 1, 2 and 3 minutes of keeping the drop on a polished surface. Since according to the literature data, the organic mass of coal is hydrophobic, and mineral impurities, as a rule, are hydrophilic, the authors investigated the degree of influence of the "ash content of coal" (Аd ) indicator on the value of Ɵ. To determine the influence of the wetting angle and the internal moisture content of coal after 14 hours of moisture saturation in water (Wins) on the strength (ϭss) of the rammed sample, the corresponding graphical dependence was determined. The data obtained indicate that any significant relationship between Аd and Ɵ is absent, the correlation coefficient is insignificant (r = 0.28). Thus, the predominant factor in the hydration of cleaned coal is the properties of its organic matter. The correlation between Ɵ and the yield of volatile substances Vdaf and the content of vitrinite Vt is also insignificant – the correlation coefficient is up to 0,43 and 0,50 respectively. A close relationship of the contact angle was found with the reflection coefficient of vitrinite Ro (r = 0.72), the internal moisture content of coal after 14 hours of saturation in water, Wins (r = 0,65), and the shear strength of the rammed coal sample ϭss (r = 0,68). Keywords: coal, ability to hydration, contact angle of wetting, organic mass of coal, mineral impurities, density, strength. Corresponding author V.M. Kuznichenko, e-mail: : [email protected]

Planar distributions of dislocations III. The exact positions of important dislocations when the number in an array is large

1971 ◽  
Vol 320 (1543) ◽  
pp. 527-535 ◽  
Keyword(s):  
Simple Procedure ◽  
Continuous Distribution ◽  
The Other ◽  
General Situation ◽  
Burgers Vector ◽  
Large Numbers ◽  
Discrete Dislocations ◽  
Model Determination ◽  
Exact Positions

It is shown that if large numbers of complete dislocations are piled-up against a coplanar barrier dislocation, the equilibrium positions occupied by those discrete dislocations in the immediate vicinity of the barrier can be found directly from the characteristics, in the barrier’s neighbourhood, of the function representing the situation where all the dislocations are smeared into a continuous distribution, assuming that they have the same Burgers vector. Since such characteristics are readily obtained by examining the relevant singular integral equation for the model, determination of the important dislocation positions becomes a simple procedure. The approach is exact and refers to the limiting situation where the number of dislocations is very large; on the other hand, the smeared-discrete compromise approach (described in earlier papers in this series), in which the important dislocations remain discrete while the remainder are smeared into a continuous distribution, is approximate but is applicable to the more general situation where the number of dislocations is sufficiently large for the distance between the important dislocations to be small compared with the array length.

Diameter Determination of Frozen-Hydrated Virions Using Polyoma Virus as a Calibration Standard

1988 ◽  
Vol 46 ◽  
pp. 166-167
Author(s):  
N. H. Olson ◽  
T. S. Baker
Keyword(s):  
Accurate Determination ◽  
Carbon Substrate ◽  
Specimen Preparation ◽  
X Ray Diffraction ◽  
Polystyrene Spheres ◽  
X Ray ◽  
Negative Stain ◽  
Highly Sensitive ◽  
Particle Images

Accurate determination of particle dimensions requires both a reliable measure of the instrumental magnification and reproducible, non-distorting specimen preparation procedures. Typical calibration standards for measuring microscope magnification include replica gratings, polystyrene spheres, and negatively-stained catalase crystals. Polystyrene spheres and catalase crystals may be used as internal standards but both are highly sensitive to beam damage. Calibrations with replica gratings are subject to greater inaccuracies at magnifications exceeding 10,000-20,000 X. Furthermore, for negatively-stained biological specimens, the object of interest as well as the standard (e.g. catalase) are susceptible to significant distortions produced when the stained sample dries on the grid. The stain itself also moves during the initial stages of irradiation.1.2Large discrepancies are often found between diameter measurements from particle images with circular profiles (e.g. spherical viruses) made in the microscope and from those measurements determined by x-ray solution scattering or other x-ray diffraction techniques. Measurements from virions embedded in negative-stain, suspended over holes in a carbon substrate, are typically much lower than the corresponding measurements by x-ray techniques, reflecting a probable shrinkage of virions in the stain.

Determination of the reduction depth of tungsten oxide thin films under the effect of proton irradiation

2011 ◽  
Vol 5 (1) ◽  
pp. 30-33 ◽  
Author(s):  
B. A. Gurovich ◽  
K. E. Prikhod’ko ◽  
L. V. Kutuzov ◽  
E. A. Rotanov ◽  
A. P. Bandura
Keyword(s):  
Thin Films ◽  
Tungsten Oxide ◽  
Proton Irradiation ◽  
Oxide Thin Films ◽  
Tungsten Oxide Thin Films

Enrichment and spectrochemical determination of volatile elements in tungsten oxide

1965 ◽  
Vol 210 (5) ◽  
pp. 339-344 ◽  
Author(s):  
Z. G. Hanna
Keyword(s):  
Tungsten Oxide ◽  
Volatile Elements
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