Elmira Kujundzic Phones & Addresses
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750 Graham Cir, Erie, CO 80516 (303) 658-0475
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Boulder, CO
Publications
Us Patents
Analyzing Ultrasonic Signals Using A Dynamic Window For An Early Detection Of Scaling In Water Processing Equipment
View pageUS Patent:
20130238133, Sep 12, 2013
Filed:
Jul 12, 2011
Appl. No.:
13/809780
Inventors:
Alan R. Greenberg - Boulder CO, US
Jack Gilron - Beer Sheva, IL
Keith D. Cobry - Lafayette CO, US
Elmira Kujundzic - Erie CO, US
Xiao Yun Lu - Longmont CO, US
Guy Mizrahi - Beer Sheva, IL
Michael Peterson - Orono ME, US
Jack Gilron - Beer Sheva, IL
Keith D. Cobry - Lafayette CO, US
Elmira Kujundzic - Erie CO, US
Xiao Yun Lu - Longmont CO, US
Guy Mizrahi - Beer Sheva, IL
Michael Peterson - Orono ME, US
Assignee:
THE REGENTS OF THE UNIVERSITY OF COLORADO, A BODY CORPORATION - Denver CO
BEN-GURION UNIVERSITY OF THE NEGEV RESEARCH AND DEVELOPMENT AUTHORITY - Beer-Sheva
BEN-GURION UNIVERSITY OF THE NEGEV RESEARCH AND DEVELOPMENT AUTHORITY - Beer-Sheva
International Classification:
G01N 29/02
US Classification:
700266, 702 25
Abstract:
A method of early detection of scaling on internal surfaces of conduits of water processing equipment, is provided herein. The method includes: transmitting ultrasonic signals through the wall of the conduits; deriving data samples from received ultrasonic signals or reflections thereof; calculating a moving average of the scatter of the ultrasonic signals, over time, based on the data samples; applying a statistical operand to the moving average, to yield a statistical distribution metric; determining a dynamic window defined by: (i) an upper boundary being the moving average plus at least a fraction of the statistical distribution metric and (ii) a lower boundary being the moving average minus the at least a fraction of the statistical distribution metric; generating a trend line being a smooth fitting of the derived samples; and monitoring the trend line within the window to detect a crossover of the trend line at either of the boundaries.
Determination Of Pore Size In Porous Materials By Evaporative Mass Loss
View pageUS Patent:
20130042670, Feb 21, 2013
Filed:
May 2, 2011
Appl. No.:
13/695251
Inventors:
Alan R. Greenberg - Boulder CO, US
William B. Krantz - Boulder CO, US
Elmira Kujundzic - Erie CO, US
Adrian Yeo - Singapore, SG
Seyed Saeid Hosseini - Singapore, SG
William B. Krantz - Boulder CO, US
Elmira Kujundzic - Erie CO, US
Adrian Yeo - Singapore, SG
Seyed Saeid Hosseini - Singapore, SG
Assignee:
NATIONAL UNIVERSITY OF SINGAPORE - Singapore
International Classification:
G01N 15/08
US Classification:
73 38
Abstract:
A method for determination of pore-size distribution in a porous material called evapo porometry (EP) is capable of determining pore sizes from approximately the nanometer scale up to the micron scale. EP determines the pore size based on the evaporative mass loss at constant temperature from porous materials that have been pre-saturated with either a wetting or non-wetting volatile liquid. The saturated porous material is placed in an appropriate test cell on a conventional microbalance to measure liquid mass loss at a constant temperature as a function of time. The mass-loss rate is then related to the pore-size distribution. The microbalance permits measuring the mass as a function of time. The slope of the mass versus time curve is the evaporation rate. The evaporation rate is related to the vapor pressure at the interface between the liquid in the porous material and the ambient gas phase. The vapor pressure in turn is related to the pore diameter.