scholarly journals Két középkori kályhacsempe fekete mázának meglepő anyagvizsgálati eredménye, és ennek magyarázata

2013 ◽  
pp. 173-182
Author(s):  
Péter Véninger
Keyword(s):  
Electron Microscopy ◽  
The Other ◽  
Color Management ◽  
Glazed Tile ◽  
Other Hand

During the examination of the two black glazed tile stoves from nyírbátor, we couldn’t decide if the black colour was the result of a technological mistake or it was coloured on purpose. Because of that, we have come to a decision to examine the tiles with the help of electron microscopy. Our hypothesis was that in the case of conscious color management we will find ordinary materials such as manganese (Mn), cobalt (Co), iron (Fe) in the glaze. On the other hand, if the black colour is the result of a mistake, it could be the consequence of an undue burning atmosphere. in this case, the outcome presumably would be a green or yellow glaze. the examination has come to a different conclusion.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Phase Analysis of the Precipitates in an Alloy 600/182 Weld

2007 ◽  
Vol 119 ◽  
pp. 111-114 ◽  
Author(s):  
Yun Soo Lim ◽  
Hong Pyo Kim ◽  
Man Kyo Jung ◽  
Joung Soo Kim
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Boundaries ◽  
Phase Analysis ◽  
Fusion Zone ◽  
Base Metal ◽  
The Other ◽  
Alloy 600 ◽  
Other Hand ◽  
Transmission Electron

The precipitates in the base metal and the fusion zone of an Alloy 600/182 weld were characterized through a transmission electron microscopy. Precipitates in the Alloy 600 base metal were identified as Cr7C3. On the other hand, (Nb,Ti)C, Al-rich and Ti-rich oxides were found on the dendritic interfaces, and tiny Cr-rich M23C6 were distributed on the grain boundaries in the Alloy 182 fusion zone.

scholarly journals Electron Microscopy of Globular Hyaline Micro-Thrombi

1977 ◽  
Author(s):  
U. Bleyl
Keyword(s):  
Electron Microscopy ◽  
Strong Evidence ◽  
The Other ◽  
Spherical Space ◽  
Intravascular Coagulation ◽  
Other Hand ◽  
Transverse Stria ◽  
Flowing Blood ◽  
Morphological Equivalent

Globular hyaline micro-thrombi(GHM) are round or oval, eosinophilic, strongly PAS-positive intravascular coagulation products with a diameter between 3 and 60/u. Immunhistochemical investigations give strong evidence that they are composed of highly polymerized fibrinogen derivatives. The ultrastructure of these GHM is characterized by spherical space lattices of frequently interconnected bundles of fibres with a periodic transverse stria-tion and the fibrin-characteristic axial periodicity of 23 nm. The densely packed spherical space lattices are surrounded by a so-called corona, plump or slender bundles of fibrin fibres characterized by the same uniforme periodic axial striation of 23 nm that spread radially over the surface of the micro-thrombi. GHM apparently originate from the interlocking and internetting of intravascularly preformed, partly polymerized, filamentary intermediates of fibrinogen-fibrin conversion in the flowing blood. Part of these GHM, on the other hand, lack this axial periodicity and the fibrillary structure of the spherical space lattices is replaced by nearly amorphous finegrained precipitates. The disappearance of the axial periodicity and of the fibrillary structure of the spherical space lattices is considered to be the morphological equivalent of a secondary fibrinolysis in the centre of the GHM. The morphogenesis of GHM in states of hyperdynamic shock is discussed.

Phase contrast and scanning electron microscopy of a soil amoeba, Hartmannella glebae

1986 ◽  
Vol 44 ◽  
pp. 300-301
Author(s):  
J. Upadhyay ◽  
M. J. Schurr ◽  
R. J. Lesseps
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Current Literature ◽  
Phase Contrast ◽  
The Other ◽  
Other Hand ◽  
As Species ◽  
Soil Amoeba ◽  
Scanning Electron

The genera Hartmannella and Acanthamoeba have been controversial. Some species of Acanthamoeba have been cited as species of Acanthamoeba, Mayorella, or Amoeba and a confusing lack of agreement persists in current literature. The genus Hartmannella was redefined by Page in 1967 to include those species which assumed a simple monopodial, limax-like form during locomotion and, where known, the cysts were smooth-walled and rounded with no opercula. The genus Acanthamoeba, on the other hand, possessed tapering, hyaline pseudopods (acanthopodia) and a cyst made up of an ectocyst and a polyhedral or stellate endocyst, with excystment by removal of opercula.

scholarly journals The rise and fall of Weber indices

2018 ◽  
Vol 51 (4) ◽  
pp. 1221-1225 ◽  
Author(s):  
Massimo Nespolo
Keyword(s):  
Electron Microscopy ◽  
Critical Analysis ◽  
Unit Cell ◽  
Reciprocal Space ◽  
The Other ◽  
Metal Science ◽  
Hexagonal Unit Cell ◽  
Other Hand ◽  
The One

Weber indices were introduced to provide a unique expression of a lattice direction with respect to the four-axis setting used for hexagonal and rhombohedral crystals. They are in general fractional indices, even in the case of a primitive hexagonal unit cell, but they are often carelessly reduced to integer values. This corresponds, on the one hand, to taking as direction indices the nodes of a lattice further from the origin and, on the other hand, to adopting a hybrid indexing between direct and reciprocal space. A critical analysis of the drawbacks of Weber indices is presented, which justifies the reluctance of crystallographers to adopt them, despite a more widespread use in fields like electron microscopy and metal science.

Orientation Relationship Between the bcc and σ Phases in Cr-Co Alloys

2006 ◽  
Vol 980 ◽  
Author(s):  
Toshihiro Doi ◽  
Makoto Tanimura ◽  
Yasumasa Koyama
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Structure Formation ◽  
Orientation Relationship ◽  
The Other ◽  
Annealing Temperatures ◽  
Other Hand ◽  
Transmission Electron ◽  
The Common ◽  
Co Alloys

AbstractTo obtain deeper understanding of the Ð structure, the formation of the Ð structure in the (bcc¨bcc+Ð) reaction at 873K and 1173K have been investigated by transmission electron microscopy. As for the orientation relationship between the bcc and Ð structures, as a results, both the common first relation of [110]bcc//[110]Ð and three second relations given by α=0°, 33°, and 64° were found in the 1173K annealing, where α is an angle between the [_110]bcc and [001]Ð directions. In the 873K annealing, on the other hand, there was only one second relation with α=0°. Based on the α=0° relation found in both annealing temperatures, the features of atomic shifts in the Ð-structure formation were also discussed.

The lamina monopolar cells in the optic lobe of the dragonfly sympetrum

1982 ◽  
Vol 297 (1084) ◽  
pp. 27-49 ◽  
Keyword(s):  
Electron Microscopy ◽  
Cross Section ◽  
Optic Lobe ◽  
The Other ◽  
Cell Type ◽  
Other Hand ◽  
Monopolar Cell ◽  
Receptor Input ◽  
Serial Electron Microscopy

The connectivities of five monopolar cells, M I-M V, within the ventral cartridge of the lamina of the dragonfly Sympetrum have been analysed from serial electron microscopy and their morphologies confirmed from Golgi-electron microscopy. The results of synaptic analyses are presented from a single cartridge photographed in its entirety in one series of transverse sections through the complete depth of the lamina and corroborated from shorter series of sections of additional cartridges. Each monopolar cell is defined by and identified from the location of its soma and the characteristic position of its axon in the cartridge cross section. M I and M II are two axial monopolar cells with large-calibre axons, while axons of M III-M V are slender and occupy polar positions, M III and M IV next to M I, M V next to the long visual fibres R 6 and R 7. M I and M II contribute postsynaptically at the triad synapses of all six retinular terminals, M I contributing exclusively at its dendrites, which number about 50 % more than those of M II. The distribution of M I and M II dendrites in general reflects the geometry and extent of synaptic engagement with the surrounding retinular terminals. In addition M II is postsynaptic at synapses of the long visual fibres R 6 and R 7, thus receiving a comprehensive and exclusive receptor input; it is only postsynaptic in the lamina. M I, on the other hand, forms an output back upon certain of its retinular inputs and upon M IV. M III too forms an important output upon M IV and it receives a selective retinular input from R 1 at synapses that are the focus of an unexpected asymmetry within the cartridge. M V, like M III, receives a selective retinular input (from R 7) while M IV receives its retinular input only indirectly, from both M I and M III. M IV and M V, like M II, have no output within the lamina. Finally, all monopolar cells excluding M II receive input from an unidentified cell type or types, called a, an input that for M I and M III is reciprocal. To judge from the diversity of their synaptic configurations, the numbers of their dendrites and probably the numbers of their synapses too, the monopolar cells form a sequence in ascending richness M V -M I. Definite parallels exist between, respectively, M I and M II of Sympetrum and L 2 and L 1 of Musca and Apis and between M III of Sympetrum and L 3 of Apis ,but further homologies are unclear

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Development of 200 kV Scanning-Transmission Electron Microscope

1974 ◽  
Vol 32 ◽  
pp. 410-411
Author(s):  
H. Koike ◽  
S. Sakurai ◽  
K. Ueno ◽  
M. Watanabe
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Scanning Transmission Electron Microscope ◽  
The Other ◽  
Morphological Observation ◽  
Magnetic Domains ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Backscattered Electron ◽  
Increasing Demand

In recent years, there has been increasing demand for higher voltage SEMs, in the field of surface observation, especially that of magnetic domains, dislocations, and electron channeling patterns by backscattered electron microscopy. On the other hand, the resolution of the CTEM has now reached 1 ∼ 2Å, and several reports have recently been made on the observation of atom images, indicating that the ultimate goal of morphological observation has beem nearly achieved.

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