scholarly journals Determination of resistance to cavitation of pyrophyllite samples

2021 ◽  
Vol 62 (2) ◽  
pp. 126-134
Author(s):  
Ljubiša Andrić ◽  
Marko Pavlović ◽  
Marina Dojčinović ◽  
Dragan Radulović
Keyword(s):  
Electron Microscopy ◽  
Cavitation Erosion ◽  
Surface Damage ◽  
Test Method ◽  
Test Time ◽  
Cavitation Resistance ◽  
Initial Sample ◽  
Erosion Test ◽  
Scanning Electron

The resistance under the action of cavitation of sintered pyrophillite samples was investigated. The initial sample of pyrophillite from the Parsovic-BiH deposit was ground a vibrating mill to a granulation of 20 mm, pressed and sintered at temperatures (⁰C): 100; 1100; 1200. To assess cavitation resistance, the change in sample mass as a function of cavitation time was monitored. The cavitation erosion test was performed using the ultrasonic vibratory cavitation test method according to the ASTM G-32 standard. Cavitation velocites were calculated for all samples, as a basic indicator of the resistance of the material under the action of cavitation. The change in the morphology of the surface with the test time was followed by scanning electron microscopy. Based on the values of cavitation velocity and analysis of the surface damage morphology, the cavitation resistance of the tested samples based on pyrophillite was determined. The obtained results indicate that the samples of sintered pyrophillite have satisfactory resistance to the action of cavitation and be applied in conditions of lower cavitation loads.

scholarly journals Influence of the polymer matrix type on cavitation resistance of composites

2021 ◽  
Vol 46 (1) ◽  
pp. 31-34
Author(s):  
Marina Dojčinović ◽  
Marko Pavlović ◽  
Slađana Jezdimirović ◽  
Branka Purić ◽  
Aleksandar Cvetković
Keyword(s):  
Electron Microscopy ◽  
Polymer Matrix ◽  
Polyester Resin ◽  
Surface Damage ◽  
Powder Composite ◽  
Test Time ◽  
Cavitation Resistance ◽  
Matrix Type ◽  
Powder Composites ◽  
Scanning Electron

Cavitation resistance of polymer matrix / basalt powder composites was determined in this work. Two types of composites were tested: epoxy resin / basalt powder composite and polyester resin / basalt powder composite. In both cases, a basalt powder was used as reinforcement in the resin (grain size 20μm, in the amount of 15 wt%). An ultrasonic vibration method with a stationary sample was used to test the cavitation resistance of composites in laboratory conditions. The change in sample mass with test time was monitored to define cavitation rate. Scanning electron microscopy was used to monitor the morphology of composites surface damage.

Evaluation of computer-controlled SEM in the study of metal-contaminated soils

2003 ◽  
Vol 67 (2) ◽  
pp. 219-231 ◽  
Author(s):  
H. W. Langmi ◽  
J. Watt
Keyword(s):  
Electron Microscopy ◽  
Heavy Metals ◽  
Contaminated Soils ◽  
X Ray ◽  
Computer Controlled ◽  
Weathering Crusts ◽  
Individual Particles ◽  
Element Mapping ◽  
Scanning Electron

Computer-controlled scanning electron microscopy (CCSEM) has been assessed for the determination of form and size distribution of heavy metals in urban contaminated soils. Metal distributions within individual particles were determined using X-ray element mapping. The sites selected for study were (1) around a landfill site, previously a colliery in Wolverhampton, UK and (2) a private garden adjacent to a railway in Nottingham, UK. Backscattered thresholding techniques were used to isolate the Pb-containing categories. The classification results for both Wolverhampton and Nottingham soils were generally similar but more Pb-containing classes were observed for the Nottingham samples when a comparison was made between results of the same size fractions. However, difficulties with the technique arose when particles showing chemically similar weathering crusts were assigned to the same class, despite having different internal compositions. The CCSEM data therefore need to be interpreted with caution and their application limited to situations in which particle internal complexity is not an issue.

scholarly journals The use of scanning electron microscopy to the study of the painting from the Church in Radcze

2013 ◽  
Vol 12 (4) ◽  
pp. 095-105
Author(s):  
Beata Klimek
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Historic Buildings ◽  
X Ray ◽  
Composition And Structure ◽  
The Church ◽  
Diagnosis Technique ◽  
Scanning Electron

One of the main tasks in the study of historic buildings is the need to identify the original materials and extensions, which often have historic character. The next task concerns the determination of the composition and structure of the historical, diagnosis technique to develop original paint. The article presents the preliminary results of paintings. Methods were used with the scanning electron microscope was equipped with an energy dispersive X-ray spectrometer (SEM-EDS).

scholarly journals New sorbents for electrochromatography based on polymer-inorganic dielectric composites

2021 ◽  
Vol 2103 (1) ◽  
pp. 012124
Author(s):  
A Y Shmykov ◽  
S V Mjakin ◽  
N A Bubis ◽  
L M Kuztetzov ◽  
N A Esikova ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Filler Content ◽  
Structural Features ◽  
Polymer Binder ◽  
Dielectric Losses ◽  
Infinite Cluster ◽  
Confocal Scanning ◽  
Scanning Electron

Abstract Oligomeric diisocyanate based coatings with different contents of barium titanate (BaTiO3) submicron sized particles as a ferroelectric filler are synthesized on poly(dimethylsiloxane) (PDMS) supports. The study of thus obtained coatings using confocal scanning electron microscopy allowed the characterization of their morphology and features of BaTiO3 particles distribution in the polymer binder, including the determination of threshold filler contents corresponding to the formation of an infinite cluster, matrix-island and chain-like structures as well as the percolation. Dielectric permittivity and dielectric losses of the composites are measured and studied depending on BaTiO3 filler content and relating structural features.

Determination of the Thicknesses and Visualization of Ion-Exchange Waveguides in Glasses by Scanning Electron Microscopy

2019 ◽  
Vol 64 (3) ◽  
pp. 418-421 ◽  
Author(s):  
A. I. Lihachev ◽  
A. V. Nashchekin ◽  
R. V. Sokolov ◽  
S. G. Konnikov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ion Exchange ◽  
Scanning Electron

The Distribution of Diatom in the Five Lakes along the Yangtze River

2013 ◽  
Vol 850-851 ◽  
pp. 1309-1312
Author(s):  
Yu Zhou ◽  
Quan Yu ◽  
Wei Hang ◽  
Yu Zhong Wang ◽  
Hui Pin Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Water Samples ◽  
Yangtze River ◽  
Water Bodies ◽  
The Yangtze River ◽  
Significant Difference ◽  
The Future ◽  
Scanning Electron

In order to investigate the diatom distribution in the five lakes along the Yangtze River, and discuss the significance for the diagnosis of drowning. 6 water samples were collected in the five lakes along Yangtze River in June, 2012. Subsequently, The genus and the quantity of the diatoms in the water samples were investigated using scanning electron microscopy (SEM). The result showed us that there was significant difference between the waters sampled from the different sites . These data on diatom distribution are helpful to the diagnosis of the cause of the death as well as to the determination of the drowning site in cases of drowning. Therefore, it is necessary to develop the database of diatoms in more extensive water bodies for the forensic diagnosis of drowning in the future.

Field Emission and Electron Microscopy

2000 ◽  
Vol 6 (4) ◽  
pp. 380-387 ◽  
Author(s):  
Christopher John Edgcombe ◽  
Ugo Valdrè
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Optical Bench ◽  
Carbon Contamination ◽  
Electron Sources ◽  
Basic Properties ◽  
Scanning Electron

AbstractAn overview and new results are presented of the investigations carried out in the last 5 years on nano-sized tips by means of electron microscopy, an electron optical bench, and computation. Tungsten and, in particular, carbon nano-tips prepared by carbon contamination in a scanning electron microscope, were studied for applications as field-emission electron sources. Several features of their use are described and the results concerning the determination of some of their basic properties are reported.

The Determination of Fabric Loop Length

1977 ◽  
Vol 47 (12) ◽  
pp. 795-801 ◽  
Author(s):  
T. J. Little ◽  
A. Hepworth
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Loop Length ◽  
Research Association ◽  
Alternative Approach ◽  
The Face ◽  
Course Length ◽  
Recorded Image ◽  
Scanning Electron

An alternative approach towards the measurement of loop length while in fabric form is proposed employing techniques of scanning electron microscopy and aerogrammetry. Distortions inherent in the recorded image have been taken into account by obtaining coordinates at intervals as determined by a micrograph of a cross-ruled grid. The lengths of all the resultant elements have been summed to obtain an estimate of the loop length, which was found to be 4–5% different from that obtained using the HATRA (Hosiery and Allied Trades Research Association, Nottingham, England) Course Length Tester. Some suggestions are offered for improving the estimated loop length by obtaining coordinates for both the face and back views of the same knitted loop. It is proposed that a similar approach would be beneficial towards an understanding of parameters governing the geometry of the knitted loop.

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