The Granitic Cotectic Curve

1947 ◽  
Vol 84 (1) ◽  
pp. 19-28 ◽  
Author(s):  
S. R. Nockolds
Keyword(s):  
Experimental Data ◽  
Chemical Analyses ◽  
Potash Felspar ◽  
Plutonic Rocks

In a recent paper (Nockolds, 1946) it was shown that certain granite-aplites associated with acid plutonic rocks of Caledonian age in Western Scotland fell on, or were very close to, the plagioclase-potash felspar-quartz cotectic curve (the granitic cotectic curve), the approximate position of which could be determined from experimental data now available. It seemed of interest to determine whether other granite-aplites from other areas behaved in the same way and chemical analyses of granite-aplites and related rocks were collected from the literature with this end in view.

Petrology and emplacement of the Los Pinos pluton, southern California

1976 ◽  
Vol 13 (9) ◽  
pp. 1288-1300 ◽  
Author(s):  
M. J. Walawender
Keyword(s):  
Experimental Data ◽  
Volcanic Eruption ◽  
Southern California ◽  
Major Element ◽  
Parent Magma ◽  
Chemical Analyses ◽  
Eastern Margin ◽  
Peninsular Ranges ◽  
Summit Region ◽  
Pelitic Rocks

The Los Pinos gabbro is located on the eastern margin of the gabbro sub-belt of the Peninsular Ranges batholilh. Two lithologic sequences are recognized in this pluton. The outer group consists of bimodal assemblages of hornblende and plagioclase in several textural varieties, whereas the inner group contains a variety of olivine–plagioclase rocks. Symplectitic intergrowths of spinel, amphibole, and orthopyroxene have developed wherever the olivine and plagioclase were in contact. The outer group is generally the older of the two, although there is evidence suggesting that their emplacement overlapped in time. The contact between the two groups is characterized locally by sequences of comb layers up to 65 m thick. Major-element chemical analyses emphasize the differences between the two groups. The outer group is generally richer in total alkalis, titanium, and silica. Variation diagrams suggest that different differentiation mechanisms operated within each group.Textural and published experimental data suggest that the two groups are derived from a parent magma by clinopyroxene fractionation at PT > 5 kbar. The more silicic differentiates were emplaced at shallower levels into a series of regionally metamorphosed pelitic rocks. Volatile streaming in restricted channels along a conduit zone and periodic degassing of the melt, possibly through volcanic eruption, produced the comb layering in the summit region. The remaining fraction intruded along the old conduit zone. Differentiation at these shallower levels (PT < 5 kbar) produced the olivine–plagioclase cumulates. The symplectic intergrowths in these units formed at this shallower level prior to the solidification of the melt.

scholarly journals ON THE VALIDATION OF VESTA 2.2.0 USING THE ARIANE-GU3 SAMPLE

2021 ◽  
Vol 247 ◽  
pp. 10005
Author(s):  
R. Ichou ◽  
B. Dechenaux
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Nuclear Data ◽  
Chemical Analyses ◽  
Spent Fuel ◽  
Fuel Sample ◽  
Isotopic Concentration ◽  
Data Libraries ◽  
Nuclear Data Libraries ◽  
Evaluated Nuclear Data

The validation of the VESTA 2.2.0 Monte Carlo depletion code has been initiated using the Spent Fuel Isotopic Composition Database (SFCOMPO). The work presented in this paper is limited to one fuel sample, the GU3 PWR-UOX sample from the ARIANE program, which has a reported burn up of 52.5 MWd.kgHM-1. The chemical analyses of the studied fuel sample were performed by 2 independent laboratories at the end of irradiation and cooling time. US and European evaluated nuclear data libraries, namely ENDF/B-VII.1 and JEFF-3.2, but also the more recent ENDF/B-VIII.0 and JEFF-3.3 are used for the VESTA 2.2.0 calculations. The isotopic concentration results are compared to experimental data and the C/E agreement is analyzed in the light of the previous VESTA 2.1.5 validation results obtained using ENDF/B-VII.0 and JEFF-3.1 nuclear data libraries.

Low- to medium-grade metamorphism in silicate iron-formations of the Cape Smith Belt, New Quebec

1968 ◽  
Vol 5 (4) ◽  
pp. 881-893 ◽  
Author(s):  
T. Hashimoto ◽  
R. Béland
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Iron Formation ◽  
Chemical Analyses ◽  
Grade Metamorphism ◽  
Isothermal Phase Diagram ◽  
Petrographic Examination ◽  
Mineral Assemblages ◽  
Invariant Points ◽  
Iron Formations

Four different assemblages of iron-rich silicates from the silicate iron-formation of the Cape Smith belt in New Quebec have been investigated. These rocks all contain quartz, magnetite, some calcite, and are composed mostly of two or more of the following silicates: stilpnomelane, minnesotaite, iron chlorite, grunerite, almandite, and biotite.From eight chemical analyses and petrographic examination, using a method developed by J. B. Thompson, an isothermal phase diagram of the system Al2O3–Fe2O3–FeO–MgO–SiO2–H2O has been constructed for the upper part of the greenschist facies of metamorphism.Speculation based on this diagram and on available experimental data is offered on the sequence of reactions leading to the assemblages observed, and on the possibility of finding mineral assemblages representing invariant points in metamorphosed iron-formations.

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

Evidence for ordered Fe3Ni

1987 ◽  
Vol 45 ◽  
pp. 216-217
Author(s):  
K.B. Reuter ◽  
D.B. Williams ◽  
J.I. Goldstein
Keyword(s):  
Experimental Data ◽  
Martensitic Transformation ◽  
Electron Diffraction ◽  
Room Temperature ◽  
Direct Evidence ◽  
Transformation Product ◽  
Iron Meteorites ◽  
X Ray ◽  
Ni Content ◽  
Temperature Transformation

In the Fe-Ni system, although ordered FeNi and ordered Ni3Fe are experimentally well established, direct evidence for ordered Fe3Ni is unconvincing. Little experimental data for Fe3Ni exists because diffusion is sluggish at temperatures below 400°C and because alloys containing less than 29 wt% Ni undergo a martensitic transformation at room temperature. Fe-Ni phases in iron meteorites were examined in this study because iron meteorites have cooled at slow rates of about 10°C/106 years, allowing phase transformations below 400°C to occur. One low temperature transformation product, called clear taenite 2 (CT2), was of particular interest because it contains less than 30 wtZ Ni and is not martensitic. Because CT2 is only a few microns in size, the structure and Ni content were determined through electron diffraction and x-ray microanalysis. A Philips EM400T operated at 120 kV, equipped with a Tracor Northern 2000 multichannel analyzer, was used.

EELS white line intensities calculated for the 3d and 4d metals

1989 ◽  
Vol 47 ◽  
pp. 388-389
Author(s):  
C. C. Ahn ◽  
D. H. Pearson ◽  
P. Rez ◽  
B. Fultz
Keyword(s):  
Experimental Data ◽  
Line Intensity ◽  
Transition Probabilities ◽  
Initial Increase ◽  
White Line ◽  
Hartree Fock ◽  
Line Intensities ◽  
Integrated Intensity ◽  
X Ray Absorption ◽  
The Continuum

Previous experimental measurements of the total white line intensities from L2,3 energy loss spectra of 3d transition metals reported a linear dependence of the white line intensity on 3d occupancy. These results are inconsistent, however, with behavior inferred from relativistic one electron Dirac-Fock calculations, which show an initial increase followed by a decrease of total white line intensity across the 3d series. This inconsistency with experimental data is especially puzzling in light of work by Thole, et al., which successfully calculates x-ray absorption spectra of the lanthanide M4,5 white lines by employing a less rigorous Hartree-Fock calculation with relativistic corrections based on the work of Cowan. When restricted to transitions allowed by dipole selection rules, the calculated spectra of the lanthanide M4,5 white lines show a decreasing intensity as a function of Z that was consistent with the available experimental data.Here we report the results of Dirac-Fock calculations of the L2,3 white lines of the 3d and 4d elements, and compare the results to the experimental work of Pearson et al. In a previous study, similar calculations helped to account for the non-statistical behavior of L3/L2 ratios of the 3d metals. We assumed that all metals had a single 4s electron. Because these calculations provide absolute transition probabilities, to compare the calculated white line intensities to the experimental data, we normalized the calculated intensities to the intensity of the continuum above the L3 edges. The continuum intensity was obtained by Hartree-Slater calculations, and the normalization factor for the white line intensities was the integrated intensity in an energy window of fixed width and position above the L3 edge of each element.

MÖSSBAUER AND CHEMICAL ANALYSES OF SOME SEDIMENTS FROM THE ROMANIAN SHORE OF THE BLACK SEA

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-445-C2-448
Author(s):  
D. Barb ◽  
L. Diamandescu ◽  
M. Morariu ◽  
I. I. Georgescu
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Chemical Analyses

A fuzzy neural network approach for modeling the growth kinetics of FeB and Fe2B layers during the boronizing process

2018 ◽  
Vol 106 (6) ◽  
pp. 603 ◽  
Author(s):  
Bendaoud Mebarek ◽  
Mourad Keddam
Keyword(s):  
Neural Network ◽  
Experimental Data ◽  
Fuzzy Neural Network ◽  
Treatment Time ◽  
Calculation Model ◽  
Average Error ◽  
Network Approach ◽  
Neural Network Approach ◽  
Fuzzy Neural ◽  
Kinetics Of

In this paper, we develop a boronizing process simulation model based on fuzzy neural network (FNN) approach for estimating the thickness of the FeB and Fe2B layers. The model represents a synthesis of two artificial intelligence techniques; the fuzzy logic and the neural network. Characteristics of the fuzzy neural network approach for the modelling of boronizing process are presented in this study. In order to validate the results of our calculation model, we have used the learning base of experimental data of the powder-pack boronizing of Fe-15Cr alloy in the temperature range from 800 to 1050 °C and for a treatment time ranging from 0.5 to 12 h. The obtained results show that it is possible to estimate the influence of different process parameters. Comparing the results obtained by the artificial neural network to experimental data, the average error generated from the fuzzy neural network was 3% for the FeB layer and 3.5% for the Fe2B layer. The results obtained from the fuzzy neural network approach are in agreement with the experimental data. Finally, the utilization of fuzzy neural network approach is well adapted for the boronizing kinetics of Fe-15Cr alloy.

Use of Posterior Probabilities to Evaluate Methods of Discriminant Analysis

1981 ◽  
Vol 20 (04) ◽  
pp. 207-212 ◽  
Author(s):  
J. Hermans ◽  
B. van Zomeren ◽  
J. W. Raatgever ◽  
P. J. Sterk ◽  
J. D. F. Habbema
Keyword(s):  
Experimental Data ◽  
Discriminant Analysis ◽  
Posterior Probabilities

By means of a case study the choice between several methods of discriminant analysis is presented. Experimental data of a two-groups problem with one or two variables is analysed. The different methods are compared according to posterior probabilities which can be computed for each subject and which are the basis of discriminant analysis. These posterior probabilities are analysed graphically as well as numerically.

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