Analysis of a Nd: YAG laser crystal by X-ray fluorescence, scanning electron microscopy and neutron activation analysis

1982 ◽  
Vol 75 (1-2) ◽  
pp. 259-264 ◽  
Author(s):  
T. M. Rosseel ◽  
L. D. Hulett ◽  
K. J. Northcutt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Laser Crystal ◽  
Yag Laser ◽  
X Ray ◽  
Scanning Electron

Niobophosphate Glass as Sintering Additive for Al2O3-YAG

2016 ◽  
Vol 720 ◽  
pp. 279-282
Author(s):  
Ricardo de Freitas Cabral ◽  
Marcelo Henrique Prado da Silva ◽  
José Brant de Campos ◽  
Aline Raybolt ◽  
Edio Pereira Lima Jr. ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Rietveld Method ◽  
X Ray Diffraction ◽  
Yag Laser ◽  
X Ray ◽  
Sintering Additive ◽  
Scanning Electron

In this study, the following compositions were produced: Al2O3-YAG laser with 2, 4, 6 and 15% by weight of niobophosphate glass (30mol%P2O5-30mol%Nb2O5-20mol%CaO-20mol%CaF2). Sintered discs were characterized by scanning electron microscopy (SEM), X-Ray diffraction (XRD) with the refinement by the Rietveld method and density. The YAG-Al2O3 composite sintered at 1450 °C showed densification of 90%, which indicates the effectiveness of the sintering additive.

Magnetic spherules from Recent fluvial sediments in Alberta, Canada: characteristics and possible origins

1995 ◽  
Vol 32 (4) ◽  
pp. 351-358 ◽  
Author(s):  
Dong Bi ◽  
Roger D. Morton
Keyword(s):  
Neutron Activation Analysis ◽  
Electron Microscope ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Fluvial Sediments ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Metal ◽  
Extraterrestrial Origin ◽  
Scanning Electron

Magnetic spherules were recently recovered in recent fluvial sediments in Alberta, Canada, and have been studied using X-ray diffraction, electron microprobe, scanning electron microscope, and neutron activation analysis. Results show that these spherules are composed of magnetite, wüstite, and hematite; some of them contain α-iron metal cores. The similarities in morphology, mineralogy, and internal structure of these spherules to spherules of extraterrestrial origin found in other environments suggest that some of these spherules from Alberta might also be of extraterrestrial origin, in spite of their unusual compositions.

Correlative Instrumental Neutron Activation Analysis, Light Microscopy, Transmission Electron Microscopy, and X-ray Microanalysis for Qualitative and Quantitative Detection of Colloidal Gold Spheres in Biological Specimens

1998 ◽  
Vol 4 (5) ◽  
pp. 481-490 ◽  
Author(s):  
Julián F. Hillyer ◽  
Ralph M. Albrecht
Keyword(s):  
Electron Microscopy ◽  
Neutron Activation Analysis ◽  
Instrumental Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Colloidal Gold ◽  
Quantitative Detection ◽  
X Ray ◽  
Instrumental Neutron Activation

Colloidal gold, conjugated to ligands or antibodies, is routinely used as a label for the detection of cell structures by light (LM) and electron microscopy (EM). To date, several methods to count the number of colloidal gold labels have been employed with limited success. Instrumental neutron activation analysis (INAA), a physical method for the analysis of the elemental composition of materials, can be used to provide a quantitative index of gold accumulation in bulk specimens. Given that gold is not naturally found in biological specimens in any substantial amount and that colloidal gold and ligand conjugates can be prepared to yield uniform bead sizes, the amount of label can be calculated in bulk biological samples by INAA. Here we describe the use of INAA, LM, transmission EM, and X-ray microanalysis (EDX) in a model to determine both distribution (localization) and amount of colloidal gold at the organ, tissue, cellular, and ultrastructural levels in whole animal systems following administration. In addition, the sensitivity for gold in biological specimens by INAA is compared with that of inductively coupled plasma-mass spectrometry (ICP-MS). The correlative use of INAA, LM, TEM, and EDX can be useful, for example, in the quantitative and qualitative tracking of various labeled molecular species following administration in vivo.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Scanning Electron Microscopy and X-Ray Analyses of Dental Tissues from a Hibernator

1976 ◽  
Vol 34 ◽  
pp. 178-179
Author(s):  
M. L. Zimny ◽  
A. C. Haller
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Body Temperature ◽  
Ground Squirrel ◽  
Alveolar Bone ◽  
X Ray ◽  
Dental Tissues ◽  
Bone Minerals ◽  
Apical Tooth ◽  
Scanning Electron

During hibernation the ground squirrel is immobile, body temperature reduced and metabolism depressed. Hibernation has been shown to affect dental tissues varying degrees, although not much work has been done in this area. In limited studies, it has been shown that hibernation results in (1) mobilization of bone minerals; (2) deficient dentinogenesis and degeneration of alveolar bone; (3) presence of calculus and tears in the cementum; and (4) aggrevation of caries and pulpal and apical tooth abscesses. The purpose of this investigation was to study the effects of hibernation on dental tissues employing scanning electron microscopy (SEM) and related x-ray analyses.

Scanning Electron Microscopy and x-ray analysis of microparticles and early hydration effects

1995 ◽  
Vol 53 ◽  
pp. 692-693
Author(s):  
Yun Lu ◽  
David C. Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Morphological Development ◽  
Early Hydration ◽  
X Ray ◽  
Blended Cements ◽  
Powder Particles ◽  
Chemical Wastes ◽  
Scanning Electron

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.

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