scholarly journals Determination of the statistical similarity of the physicochemical measurement data of shale formations based on the methods of cluster analysis

Nafta-Gaz ◽  
2016 ◽  
Vol 72 (11) ◽  
pp. 910-918
Author(s):  
Piotr Łętkowski ◽  
◽  
Andrzej Gołąbek ◽  
Paweł Budak ◽  
Tadeusz Szpunar ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Measurement Data ◽  
Shale Formations ◽  
Statistical Similarity ◽  
Physicochemical Measurement

Evaluation of Actual Geometric Tolerances Using Coordinate Measuring Machine Data

1989 ◽  
Author(s):  
W. H. ElMaraghy ◽  
Z. Wu ◽  
H. A. ElMaraghy
Keyword(s):  
Three Dimensional ◽  
Measurement Data ◽  
Simulated Data ◽  
Coordinate Measuring Machine ◽  
Optimization Techniques ◽  
Test Cases ◽  
Tolerance Zone ◽  
Geometric Tolerances ◽  
Measuring Machine

Abstract This paper focuses on the development of a procedure and algorithms for the systematic comparison of geometric variations of measured features with their specified geometric tolerances. To automate the inspection of mechanical parts, it is necessary to analyze the measurement data captured by coordinate measuring machines (CMM) in order to detect out-of-tolerance conditions. A procedure for determining the geometric tolerances from the measured three dimensional coordinates on the surface of a cylindrical feature is presented. This procedure follows the definitions of the geometric tolerances used in the current Standards, and is capable of determining the value of each geometric tolerance from the composite 3-D data. The developed algorithms adopt the minimum tolerance zone criterion. Nonlinear numerical optimization techniques are used to fit the data to the minimum tolerance zone. Two test cases are given in the paper which demonstrate the successful determination of geometric tolerances from given simulated data.

Accurate Determination of Object Position from Imprecise Data

1998 ◽  
Vol 120 (4) ◽  
pp. 559-564 ◽  
Author(s):  
K. C. Gupta ◽  
P. Chutakanonta
Keyword(s):  
Accurate Determination ◽  
Measurement Data ◽  
Decomposition Methods ◽  
Basic Method ◽  
Random Errors ◽  
Object Position ◽  
Cad Cam ◽  
Simulator Design ◽  
Vehicle Simulator

The problem of accurate determination of object position from imprecise and excess measurement data arises in kinematics, biomechanics, robotics, CAD/CAM and flight/vehicle simulator design. Several methods described in the literature are reviewed. Two new methods which take advantage of the modern matrix oriented software (e.g., MATLAB, IMSL, EISPACK) are presented and compared with a “basic” method. It is found that both of the proposed decomposition methods (I: SVD/QR and II: SVD/QS) give better absolute results than a “basic” method available from the text books. On a relative basis, the second method (SVD/QS Decomposition) gives slightly better results than the first method (SVD/QR Decomposition). Examples are presented for the cases when the points chosen are nearly dependent and when the independent points have small random errors in their coordinates.

On-line determination of ore type using cluster analysis and neural networks

1995 ◽  
Vol 8 (6) ◽  
pp. 637-648 ◽  
Author(s):  
S Laine ◽  
H Lappalainen ◽  
S.-L Jämsä-Jounela
Keyword(s):  
Neural Networks ◽  
Cluster Analysis ◽  
On Line

Greenschist-facies metamorphism of the Burgess Shale and its implications for models of fossil formation and preservation

2003 ◽  
Vol 40 (1) ◽  
pp. 13-25 ◽  
Author(s):  
Wayne Powell
Keyword(s):  
Organic Carbon ◽  
Greenschist Facies ◽  
Organic Carbon Content ◽  
Canadian Rocky Mountains ◽  
Burgess Shale ◽  
Rock Composition ◽  
Shale Formations ◽  
Metamorphic History ◽  
Crenulation Cleavage

Metamorphosed silty mudstones of the Burgess Shale and Stephen Shale formations record a poly metamorphic history. An early greenschist-facies event associated with burial by Paleozoic strata produced a nearly ubiquitous bedding-parallel cleavage (S1). Tectonic exhumation during the formation of the southern Canadian Rocky Mountains produced a domainal subgreenschist-facies retrograde overprint in which a high-angle crenulation cleavage (S2) was developed. Whereas all rocks have experienced these two events, the degree of deformation and fossil pre servation varies with position relative to the Cathedral Escarpment. This paleosubmarine cliff resulted in a zone of reduced deformation within adjacent strata by buttressing them during burial and deflecting deformation during orogenesis. Fossil-bearing strata are composed of a typical greenschist assemblage of muscovite–chlorite–quartz–albite, are devoid of clays, and contain an average of 0.28% organic carbon. This typical metamudstone assemblage is consistent with the typical whole-rock composition of these rocks which tends to be richer in K and Al and poorer in Fe relative to the Post-Archean Average Shale. These mineralogical–compositional characteristics suggest that the premetamorphic clay assemblage was likely illite–smectite–kaolinite, with no evidence of highly reactive species such as nontronite or Na-montmorillonite. This is contrary to the required conditions for taphonomic models involving organic preservation due to clay-related suppression of decomposition-related reactions. Metamorphism of the Burgess Shale has also re duced the total organic carbon content to <20% of initial values. This must be considered in any models that involve interpretation of organic carbon in diagenetic processes (e.g., fossil formation and determination of paleoredox conditions).

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