scholarly journals Electron microprobe and scanning electron microscope mineral analyses of diagenetic minerals from Lower Cretaceous reservoir sandstone, Scotian Basin, offshore Nova Scotia

2019 ◽  
Author(s):  
G Pe-Piper ◽  
K Wallace ◽  
D J W Piper
Keyword(s):  
Electron Microscope ◽  
Nova Scotia ◽  
Scanning Electron Microscope ◽  
Electron Microprobe ◽  
Lower Cretaceous ◽  
Diagenetic Minerals ◽  
Mineral Analyses ◽  
Scanning Electron

Réactivités aux alcalis du grès de Potsdam dans les bétons

1977 ◽  
Vol 4 (3) ◽  
pp. 332-344 ◽  
Author(s):  
J. Berard ◽  
N. Lapierre
Keyword(s):  
New York ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silica Gel ◽  
Electron Microprobe ◽  
Rock Type ◽  
Secondary Minerals ◽  
Alkali Silica Reactivity ◽  
External Sources ◽  
Scanning Electron

Numerous old concrete structures showing signs of disintegration are found in the Beauharnois–Valleyfield area located to the southwest of Montreal.After a short examination of some of the structures, evidences of alkali–silica reactivity appear to be related to sandstone aggregates belonging to the Potsdam group. This rock type, although common in the state of New York and in the provinces of Quebec and Ontario, is only very rarely used as an aggregate owing to its hardness and abrasion. Nevertheless, when available from important excavation sites it has sometimes been used as an aggregate with ordinary alkali-rich cements.The products of the chemical reactions between the siliceous aggregates and the cement were studied with a polarizing microscope, a scanning electron microscope, an electron microprobe, and a thermobalance and differential thermoanalyser.During these studies superposed layers of silica gel of variable composition were found and secondary minerals were also identified. The Na/K ratio was found to increase in the more recent layers of silica gel suggesting that sodium could have been added within the structures as winter de-icing salts.The hypothesis is put forward that even if a low alkali cement is used with this Potsdam sandstone, alkali–silica reactivity could still occur in the presence of alkalies from external sources.

Occurrence of Heteropolaria lwoffi (Fauré-Fremiet, 1943) and Apiosoma piscicola Blanchard, 1885 (Ciliata) on Salvelinus fontinalis (Mitchill) in Nova Scotia, Canada

1987 ◽  
Vol 65 (10) ◽  
pp. 2426-2429 ◽  
Author(s):  
D. K. Cone ◽  
P. H. Odense
Keyword(s):  
Electron Microscope ◽  
Nova Scotia ◽  
North America ◽  
Scanning Electron Microscope ◽  
Salvelinus Fontinalis ◽  
Fish Farm ◽  
Mucous Cells ◽  
First Report ◽  
Scanning Electron

Heteropolaria lwoffi (Fauré-Fremiet, 1943) and Apiosoma piscicola Blanchard, 1885 (Ciliata) are reported from fry of Salvelinus fontinalis (Mitchill) at a fish farm in Nova Scotia. The specimens were examined with a scanning electron microscope. Heteropolaria lwoffi attached to pore walls of mucous cells. Apiosoma piscicola had an affinity for the attached scopula of H. lwoffi. Bacterial microcolonies were associated with the adhesive substance secreted by the scopulas but there was no evidence of colony expansion into the underlying skin. The study represents the first specific identifications of stalked peritrichs from salmonids in North America and the first report of A. piscicola on the continent.

New Instrumental Techniques and Their Application to Electron Microprobe Analysis and Scanning Electron Microscopy

1970 ◽  
Vol 24 (4) ◽  
pp. 420-426 ◽  
Author(s):  
James P. Smith ◽  
Lee R. Reid
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electron Microprobe ◽  
Secondary Electron Emission ◽  
Rate Analysis ◽  
Quantitative Measurements ◽  
Modulation Techniques ◽  
New Instrumentation ◽  
Phase Sensitive ◽  
Scanning Electron

This paper reviews several applications of new instrumentation which have been developed for the electron microprobe analyzer and the scanning electron microscope. By using signal modulation techniques and phase sensitive detection, the information from the scanning electron microscope is made more quantitative. Digital techniques applied to photomultiplier outputs allow more sensitive and quantitative measurements of cathodoluminescence intensities and secondary electron emission. The technique of pulse rate analysis is used to enhance the information contained in x-ray scanning micrographs from an electron microprobe analyzer. Several examples of these techniques are discussed.

The texture of an english fuller's earth

Clay Minerals ◽  
1982 ◽  
Vol 17 (2) ◽  
pp. 255-258 ◽  
Author(s):  
R. H. S. Robertson ◽  
D. Tessier ◽  
J. L. White
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Lower Cretaceous ◽  
Volcanic Ash ◽  
Glass Fragment ◽  
Basaltic Glass ◽  
Fuller’S Earth ◽  
Scanning Electron

It is generally agreed that the English mid-Jurassic and Lower Cretaceous fuller's earths were derived from volcanic ash. In the Lower Cretaceous fuller's earth of Woburn, Kerr (1932) recognized partially decomposed relics of shards in a matrix of montmorillonite, and Grim (1933, 1935) described montmorillonite pseudomorphs after glass fragments in the Bath fuller's earth of Bathonian age. Jeans et al. (1977) published twenty-two SEM pictures of pyroclasts, including sanidine, sphene, trachytic pumice, and a basaltic glass fragment. Photomicrographs of the Lower Cretaceous fuller's earth show shard relicts ranging in length from 0·8-1·26 mm (median ∼1·12 mm) and in thickness from 5-15µm (Jeans et al., 1977, fig. 14a). However, much remains obscure about the shape, size and mode of packing of the argillized vitric particles which make up the bulk of fuller's earths. This note describes the texture of an English fuller's earth which was freeze-fractured (Tessier, 1978), prior to examination with a scanning electron microscope.

Metallography and Corrosion Product Studies on Archaeological Bronze Fragments from the Qu Cun Site

1996 ◽  
Vol 462 ◽  
Author(s):  
W. T. Chase ◽  
Quanyu Wang
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Corrosion Product ◽  
Electron Microprobe ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Western Zhou ◽  
Future Work ◽  
Scanning Electron

ABSTRACTThe authors studied a suite of fragments of corroded bronzes from the Tienma-Qu Cun site, a Western Zhou city and cemetery complex dating from ca. 1000 to ca. 650 B.C‥ Conventional metallographic techniques were used along with scanning electron microscope, electron microprobe and x-ray diffraction. The bronzes are very varied in structure and composition. Most are cast, moderate-tin bronzes, but some are high or low in tin or lead. A few show a worked and annealed structure, and some of the cast bronzes were also heat treated (possibly by use as cooking pots). corrosion patterns also vary greatly, from almost uncorroded to total mineralization. Periodic and esquential corrosion phenomena were detected, as well as patination applied when the bronzes were made. We had hoped to be able to ascertain the causes of the different penetration of corrosion in these samples, but that must remain for future work.

Electron Microprobe and Scanning Electron Microscope Investigations on Plate-Shaped CdS Single Crystals

1968 ◽  
Vol 29 (2) ◽  
pp. K89-K90
Author(s):  
P. Flögel ◽  
E. Nebauer ◽  
H.-J. Ullrich ◽  
S. Däbritz ◽  
F. Zimmer
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Single Crystals ◽  
Electron Microprobe ◽  
Scanning Electron
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