scholarly journals Peculiarities of forming stereoscopic images by the raster electron microscope

Author(s):  
Gennadii Mamchev ◽  
Author(s):  
A. G. Anisovich ◽  
M. I. Markevich ◽  
A. N. Malyshko

The article deals with the comparative application of optical and raster microscopy for non-metallic objects and non-conducting surfaces. It is noted that this issue is not covered much in the special literature. There are practically no publications that compare and describe photos of the structure of materials obtained using fundamentally different microscopes, in particular, metallographic and raster. The causes of image distortion in a raster electron microscope in the study of dielectrics are considered. Comparative images of the oxidized surface, fabrics and natural leather obtained using raster and optical microscopy are presented. The advantages of optical microscopy in the study of non-conducting surfaces are shown.


2020 ◽  
Vol 25 (6) ◽  
pp. 497-504
Author(s):  
I.V. Silaev ◽  
◽  
I.N. Goncharov ◽  
T.T. Magkoev ◽  
T.I. Radchenko ◽  
...  

An important unit of an electron microscope is the system controlling the electron beam, responsible for raster forming on the specimen and the electron probe focusing, which provides an achievement of minimum of aberrations and the maximum of resolving capacity of formed electron image. During using electron microscope the image quality gradually deteriorates, manifesting the resolving capacity reduction and the astigmatism appearance. An attachment developed for the raster electron microscope, permitting to perform the highly effective diagnostics of the configuration of the scanning electron beam, controlled by a precision magneto-optical system, has been offered. It has been shown that the direct visual observing the scanning electron probe, in particular the evaluation of the ellipticity of its cross-section using the WEB camera matrix, combined with the sample plane, as a result, provides more efficient tuning and repair of the scanning electron microscope.


Author(s):  
Benjamin Schuerch ◽  
Sibylle Wolf ◽  
Patrick Schmidt ◽  
Nicholas J. Conard

The site of Vogelherd in the Lone Valley of southwestern Germany has become world famous for its many unique artworks made from mammoth ivory, personal ornaments, flute fragments, lithic artifacts, and antler and bone artifacts. In the study below, the molluscs from Vogelherd are presented, offering us new insights on the mobility and social behavior of Aurignacian groups in the Lone Valley. Some of the mollusc finds come from the 1931 excavation of Gustav Riek; however, most of them were uncovered during the later re-excavations of the site between 2005 and 2012. In order to provide context for these finds, we compare the molluscs from Vogelherd with those from across Central Europe. The identifiable fragments from Vogelherd belong to the genus Glycymeris. The Glycymeris molluscs originated from the Mainz Basin. This determination makes it possible to reconstruct one of the farthest long-distance connections known for the Upper Paleolithic in Germany. In addition to the Glycymeris finds, we present a tool that was also made from a mollusc. This mollusc-tool, coming from the excavation of 1931 and attributed to the Aurignacian, is a unique find for this time period of southern Germany. With this piece, along with microscopic examinations and discussions of the Glycymeris molluscs, we present a wide range of possible uses for these finds. For example, we discuss the possible use of the molluscs as ochre containers. To test this, we used EDX-analysis and a raster electron microscope. We compare the Glycymeris molluscs of Vogelherd with those from Gravettian and Magdalenian contexts at Hohle Fels, Geißenklösterle, Petersfels, and Gnirshöhle, and we provide a list of all sites from Germany, Switzerland, Eastern France, and Belgium with Glycymeris finds. We use size comparisons to show differences as well among the Glycymeris finds of Vogelherd and other Upper Paleolithic sites in southwestern Germany. In conclusion, we demonstrate that the Glycymeris molluscs of Vogelherd best fit into the Aurignacian, and we provide other Aurignacian sites that contained similar finds. By discussing other long-distance connections in the Aurignacian of southern Germany, it becomes evident that Glycymeris molluscs are not specific only to the Swabian Aurignacian.


1987 ◽  
Vol 30 (2) ◽  
pp. 140-142
Author(s):  
R. M. Ammosov ◽  
V. V. Zheleznov ◽  
A. I. Kozlitin ◽  
A. V. Nikitin

1979 ◽  
Vol 34 (1) ◽  
pp. 117-118
Author(s):  
W. C. T. Dowell

Abstract Oblique illumination, although accompanied by distortion, provides a simple method of obtaining stereoscopic images in a shadow electron microscope. It is not necessary to tilt the specimen.


Author(s):  
K. C. Tsou ◽  
J. Morris ◽  
P. Shawaluk ◽  
B. Stuck ◽  
E. Beatrice

While much is known regarding the effect of lasers on the retina, little study has been done on the effect of lasers on cornea, because of the limitation of the size of the material. Using a combination of electron microscope and several newly developed cytochemical methods, the effect of laser can now be studied on eye for the purpose of correlating functional and morphological damage. The present paper illustrates such study with CO2 laser on Rhesus monkey.


Author(s):  
R. A. Waugh ◽  
J. R. Sommer

Cardiac sarcoplasmic reticulum (SR) is a complex system of intracellular tubules that, due to their small size and juxtaposition to such electron-dense structures as mitochondria and myofibrils, are often inconspicuous in conventionally prepared electron microscopic material. This study reports a method with which the SR is selectively “stained” which facilitates visualizationwith the transmission electron microscope.


Author(s):  
J. N. Meador ◽  
C. N. Sun ◽  
H. J. White

The electron microscope is being utilized more and more in clinical laboratories for pathologic diagnosis. One of the major problems in the utilization of the electron microscope for diagnostic purposes is the time element involved. Recent experimentation with rapid embedding has shown that this long phase of the process can be greatly shortened. In rush cases the making of projection slides can be eliminated by taking dark field electron micrographs which show up as a positive ready for use. The major limiting factor for use of dark field micrographs is resolution. However, for conference purposes electron micrographs are usually taken at 2.500X to 8.000X. At these low magnifications the resolution obtained is quite acceptable.


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