A geochemical profile of the Swan Hills Reef

1968 ◽  
Vol 5 (2) ◽  
pp. 287-309 ◽  
Author(s):  
E. M. Cameron
Keyword(s):  
Solid Solution ◽  
Vertical Plane ◽  
Emission Spectrometry ◽  
Windward Side ◽  
Direct Reading ◽  
Vertical Variation ◽  
Analysis Techniques ◽  
Geochemical Profile ◽  
Magnesian Calcite ◽  
Specific Factors

Over four hundred samples were taken from cores that form a vertical plane section through the Swan Hills Reef, an important oil-bearing reservoir in the Devonian rocks of west-central Alberta. Quantitative determinations for eight elements were made on the samples by direct-reading emission spectrometry. The resulting chemical data were treated by R-mode factor analysis techniques, including rotation to oblique solutions and the computation of factor scores. The distribution of the different factors within the reef was then determined by computing trend surfaces for the scores. Factors with low eigenvalues and even specific factors were found of considerable use for interpreting the data.Dolomite in the reef appears to be derived mainly from high-magnesian calcite of possible algal origin that was formed on the windward side of the reef. Sr held in calcite as a solid solution impurity shows a primary trend to depletion in the organic framework facies that margins the reef. This is caused by greater diagenetic leaching of these rocks. Secondary variation of Sr may indicate periods when the reef was elevated above sea level and underwent subaerial weathering. Vertical variation of Mn and Fe held in solid solution in calcite appears to be related to tectonic changes in the region.

New Design Concepts for Direct Reader Measurement Electronics

1988 ◽  
Vol 42 (6) ◽  
pp. 961-972 ◽  
Author(s):  
V. Karanassios ◽  
G. Horlick
Keyword(s):  
Integrated Circuits ◽  
Atomic Emission ◽  
Atomic Emission Spectrometry ◽  
Emission Spectrometry ◽  
Single Chip ◽  
Direct Reading ◽  
Design Concepts ◽  
Distributed Intelligence ◽  
And Control ◽  
Intelligence Approach

A dual-processor, distributed-intelligence approach toward the computerization of a direct-reading polychromator for atomic emission spectrometry is described. Emphasis is placed on a “zero based design” of the PMT current integration electronics of a direct-reader channel using microprocessor bus architectures, programmable support chips, data domain conversion integrated circuits, and inexpensive single-board microcomputers. Traditional analog integration of the current signal is replaced by domain conversion of the current to a frequency, and integration/digitization is achieved with the use of single chip software programmable counters. Each channel can be independently addressed, configured, cleared, preset, and read, as the channels are autonomous units on the bus of the data acquisition and control microcomputer.

Analysis of Atmospheric Particulates for Trace Elements by Optical Emission Spectrometry

1976 ◽  
Vol 30 (4) ◽  
pp. 392-405 ◽  
Author(s):  
D. R. Scott ◽  
W. A. Loseke ◽  
L. E. Holboke ◽  
R. J. Thompson
Keyword(s):  
Trace Elements ◽  
Internal Standard ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Acid Extraction ◽  
Calibration Data ◽  
Direct Reading ◽  
Surveillance Network ◽  
Precision Data ◽  
Relative Standard

One thousand composited particulate samples collected by the National Air Surveillance Network in 1970 on glass fiber filters were analyzed for 24 trace elements by spark-excited direct reading emission spectrometry. After acid extraction, the lithium chloride stabilized extracts were analyzed in duplicate using a rotrode with indium as an internal standard. Interference corrections and calibration data were frequently updated during analyses by special minicomputer programs. Iron, calcium, aluminum, magnesium, zinc, and manganese were found in unused filters. Precision data on samples had a median relative standard deviation of 14% for all elements. The median spike recovery was 97%, excluding tin with 11 to 28%. Analysis of different portions of the same filters gave average concentration differences with a median of 14%. Detection limits for all elements and lead analysis by both atomic absorption and optical emission are reported. Zinc and tin data were unacceptable due to poor precision or accuracy.

Evaluation of a Silicon-Intensified Target Image Detector for Inductively Coupled Plasma Emission Spectrometer

1980 ◽  
Vol 34 (2) ◽  
pp. 211-216 ◽  
Author(s):  
Naoki Furuta ◽  
C. W. McLeod ◽  
Hiroki Haraguchi ◽  
Keiichiro Fuwa
Keyword(s):  
Inductively Coupled Plasma ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Target Image ◽  
Direct Reading ◽  
Plasma System ◽  
Inductively Coupled ◽  
Flame Emission ◽  
Instrumental System ◽  
Spectral Monitoring

A silicon-intensified vidicon target tube coupled to an optical multichannel analyzer has been evaluated as a detector system for inductively coupled plasma emission spectrometer. The silicon-intensified target detector was combined with a relatively high resolution monochromator to provide a simultaneous spectral monitoring capability over a 5 nm range. The detection limits obtained for 27 elements were at the nanograms per milliliter level in many cases. The detection limit data are compared to those of flame emission spectrometry using the same instrumental system, and also to those obtained by a commercial direct reading inductively coupled plasma system which utilizes photomultiplier detection.

A Method for Analysis of Plant Tissue by Direct Reading Spark Emission Spectroscopy

1974 ◽  
Vol 28 (1) ◽  
pp. 5-8 ◽  
Author(s):  
M. H. Chaplin ◽  
A. R. Dixon
Keyword(s):  
Plant Tissue ◽  
Internal Standard ◽  
Emission Spectrometry ◽  
Regression Equations ◽  
Linear Quadratic ◽  
Rotating Disc ◽  
Buffer Solution ◽  
Direct Reading ◽  
Mesh Screen ◽  
Relative Standard

A procedure was developed for the rapid quantitative determination of K, P, Ca, Mg, Mn, Fe, Cu, B, and Zn content in plant tissue by direct reading emission spectrometry using spark excitation and the rotating disc electrode technique. Aliquots of standard reference material, ground to pass a 40 mesh screen, are weighed into high form porcelain crucibles and ashed at 450°C for 6 h. Five milliliters of an internal standard-buffer solution (0.2% cobalt and 0.5% lithium in 1 N HCl) are added to the remaining ash. The resulting solution is subjected to a 30-sec burn on the spectrometer, and the intensity ratios for each element are recorded. Known concentrations ( X) and intensity ratio units ( Y) are entered into a stepwise regression computer program, and the linear, quadratic, and cubic regressions of Y on X are determined. Sample values are entered as Y into the appropriate regression equation which is then solved for X. If quadratic or cubic regression equations are used, the program will select the appropriate root. Relative standard deviations for samples determined over a several-day period generally were less than 10%.

A Knowledge-Based Decision Support System for Combined Heat and Power Investment Appraisal and Plant Selection

1996 ◽  
Vol 210 (1) ◽  
pp. 15-24
Author(s):  
R A Hughes ◽  
B Ramsay ◽  
C Rossini
Keyword(s):  
Combined Heat And Power ◽  
Energy Costs ◽  
Plant Selection ◽  
Analysis Techniques ◽  
Knowledge Based ◽  
Investment Appraisal ◽  
Potential Market ◽  
Specific Factors ◽  
High Degree

Combined heat and power (CHP) can, in the most suitable cases, reduce a consumer's total energy costs by up to 40 per cent. It is important to stress that CHP is not viable at all sites and further that poor choice of CHP plant often results in inefficient and uneconomic operation. It is therefore vitally important to build a clear picture of what specific factors determine the profitability of a CHP scheme. The development of an accurate, reliable economic model is necessary for any sector where a potential market for CHP exists. Conventional economic models have a number of limitations, particularly where situations involve a high degree of risk and uncertainty. This paper shows how decision analysis techniques can be combined with a conventional spreadsheet to overcome these weaknesses and demonstrates the power and flexibility of the resulting model with a case study.

Foliar analysis by direct-reading vacuum emission spectrometry

1975 ◽  
Vol 26 (4) ◽  
pp. 441-454
Author(s):  
John S. Johnson ◽  
Robert Pope ◽  
Peter T. S. Sandon
Keyword(s):  
Emission Spectrometry ◽  
Foliar Analysis ◽  
Direct Reading

scholarly journals Mixed Methodology Approaches to Exploring Spiritual Transformation

2015 ◽  
Author(s):  
Lewis Mehl-Madrona ◽  
Barbara Mainguy ◽  
Michael Valenti
Keyword(s):  
Narrative Analysis ◽  
Life Stories ◽  
Training Session ◽  
Traditional Healers ◽  
Spiritual Transformation ◽  
Analysis Techniques ◽  
Observer Reliability ◽  
Medical Status ◽  
Specific Factors ◽  
Psychometric Studies

Research suggests that spiritual transformation, a change in the way a person considers the sacred, can change medical outcome (Pargament, 2006) Psychometric studies have failed to identify specific factors, but qualitative reports detail an experience that can be reliably shown to have an impact. We report on the development of a rubric for quantifying levels of spiritual transformation. Narrative analysis techniques were used to quantify levels of spiritual transformation from participants’ life stories, experience with traditional healers, and subsequent medical status. A quantification rubric was developed and 111 assistants rated the stories after a three - hour training session. Inter - observer reliability was 0.87 (95% CI, 0.72 to 0.97, p < 0.001). Findings suggest it is possible to develop reliable coding scenarios that independent raters can follow to use in research to quantifiably assess spiritual transformation.

Sign in / Sign up

Export Citation Format

Share Document