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A study of multistage/multifraction column for fine particle separation. Quarterly technical progress report, second quarter April 1995--July 1995

Description: The overall objective of the proposed research program is to explore the potential application of a new invention involving a multistage column equipped with vortex-inducing loop-flow contactors (hereafter referred to as the multistage column) for fine coal cleaning process. The research work will identify the design parameters and their effects on the performance of the separation process. The results of this study will provide an engineering basis for further development of this technology in coal cleaning and in the general areas of fluid/particle separation. In the first year of the project, we completed equipment design, construction of the new column for hydrodynamic tests and gas holdup measurements. Also, we have initiated the determination of bubble size as part of the hydrodynamic measurements.
Date: July 20, 1995
Creator: Chiang, S.H.
Partner: UNT Libraries Government Documents Department

Unsupervised hyperspectral image analysis using independent component analysis (ICA)

Description: In this paper, an ICA-based approach is proposed for hyperspectral image analysis. It can be viewed as a random version of the commonly used linear spectral mixture analysis, in which the abundance fractions in a linear mixture model are considered to be unknown independent signal sources. It does not require the full rank of the separating matrix or orthogonality as most ICA methods do. More importantly, the learning algorithm is designed based on the independency of the material abundance vector rather than the independency of the separating matrix generally used to constrain the standard ICA. As a result, the designed learning algorithm is able to converge to non-orthogonal independent components. This is particularly useful in hyperspectral image analysis since many materials extracted from a hyperspectral image may have similar spectral signatures and may not be orthogonal. The AVIRIS experiments have demonstrated that the proposed ICA provides an effective unsupervised technique for hyperspectral image classification.
Date: June 30, 2000
Creator: Chiang, S. S. & Ginsberg, I. W.
Partner: UNT Libraries Government Documents Department

A study of multi-stage/multifunction column for fine particle separation. Quarterly report, October 1 - December 31, 1996

Description: The overall objective of the research program is to explore the potential application of a new invention involving a multistage column equipped with concentric draft-tubes (hereafter referred to as the multistage column) for fine coal cleaning and other fluid/particle separation processes. The research work will identify the design parameters and their effects on the performance of the separation process. The results of this study will provide an engineering basis for further development of this technology in coal cleaning and in the general areas of fluid/particle separation. Wastewater treatment tests program was conducted during this quarter. Preliminary tests showed that the multistage column had superior performance to conventional column. In both batch and continuous operations, the oil removal efficiencies were higher than 90%. The results were also compared with data reported in the open literature. 7 refs., 4 figs., 1 tab.
Date: December 31, 1996
Creator: Chiang, S.H.
Partner: UNT Libraries Government Documents Department

A Study of Multistage/Multifunction Column for Fine Particle Separation.

Description: Hydrodynamic tests were continued in this quarter. Liquid circulation velocities are the characteristic parameters in the multistage column. Conductivity tracer response method has been set up for liquid circulation velocities measurement. The period of dampened sinusoidal conductivity signals can be clearly identified and then converted into linear and superficial liquid velocities.
Date: September 15, 1997
Creator: Chiang, S.
Partner: UNT Libraries Government Documents Department

A Study of Multistage/Multifunction Column for Fine Particle Separation.

Description: A non-agitated multi-stage column was constructed and applied to wastewater treatment. Preliminary oil/water separation tests were performed. Excellent separation results verifies the multi-function feature of the multi-stage column. Hydrodynamic behavior is considered as the underlying cause for the separation performance. Therefore, a series of experiments were carried out to investigate the hydrodynamic parameters, including gas holdups and liquid circulating velocities. The experimental data will be used to create a mathematical model to simulate the multi-stage column process. The model will further shed light on the future scale-up of the MSTLFLO process.
Date: September 15, 1997
Creator: Chiang, S.
Partner: UNT Libraries Government Documents Department

A study of multistage/multifunction column for fine particle seperation

Description: The objective if this program is to explore the potential application of a multistage column equipped with concentric draft- tubes (multistage column) for fine coal cleaning. The aim is to identify design parameters of the separation process. In the last quarter we conducted the gas holdup measurement which is an essential part of the hydrodynamic experiments for establishing a process model for engineering design and scale-up.
Date: September 7, 1997
Creator: Chiang, S.
Partner: UNT Libraries Government Documents Department

The Response of Solids to Elastic/ Plastic Indentation

Description: A new approach for analysing indentation plasticity and indentation fracture is presented, The analysis permits relations to be established between material properties (notably hardness, yield strength and elastic modulus) and the dimensions of the indentation and plastic zone. The predictions are demonstrated to be fully consistent with observations performed on a wide range of materials. The indentation stress fields can also be adapted to generate predictions of indentation fracture thresholds for the three dominant crack types: radial, median and lateral cracks. The predictions are generally consistent with experimental observations.
Date: November 1, 1980
Creator: Chiang, S. S.; Marshall, D. B. & Evans, A. G.
Partner: UNT Libraries Government Documents Department