Other Engineering Commons^™

Comparison Of Toms And Avhrr Volcanic Ash Retrievals From The August 1992 Eruption Of Mt. Spurr, N. A. Krotkov, O. Torres, C. Seftor, A. J. Krueger, A. Kostinski, William I. Rose, Gregg J. Bluth, D. Schneider, S. J. Schaefer

Department of Geological and Mining Engineering and Sciences Publications

On August 19, 1992, the Advanced Very High Resolution Radiometer (AVHRR) onboard NOAA-12 and NASA's Total Ozone Mapping Spectrometer (TOMS) onboard the Nimbus-7 satellite simultaneously detected and mapped the ash cloud from the eruption of Mt. Spurr, Alaska. The spatial extent and geometry of the cloud derived from the two datasets are in good agreement and both AVHRR split window IR (11–12µm brightness temperature difference) and the TOMS UV Aerosol Index (0.34–0.38µm ultraviolet backscattering and absorption) methods give the same range of total cloud ash mass. Redundant methods for determination of ash masses in drifting volcanic clouds offer many advantages …

Early Evolution Of A Stratospheric Volcanic Eruption Cloud As Observed With Toms And Avhrr, David J. Schneider, William I. Rose, Larry R. Coke, Gregg J. Bluth, Ian E. Sprod, Arlin J. Krueger

Department of Geological and Mining Engineering and Sciences Publications

This paper is a detailed study of remote sensing data from the total ozone mapping spectrometer (TOMS) and the advanced very high resolution radiometer (AVHRR) satellite detectors, of the 1982 eruption of El Chichón, Mexico. The volcanic cloud/atmosphere interactions in the first four days of this eruption were investigated by combining ultraviolet retrievals to estimate the mass of sulfur dioxide in the volcanic cloud [Krueger et al., 1995] with thermal infrared retrievals of the size, optical depth, and mass of fine-grained (1–10 μm radius) volcanic ash [Wen and Rose, 1994]. Our study provides the first direct evidence of gravitational separation …

Summer 1999, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

Winter/Spring 1999, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format.

Combining Wavelets And Hotelling Transforms In Image Query, Sol Neeman Ph.D.

Engineering Studies Faculty Publications and Creative Works

In the "content based" image query, also referred to as "query by example," "similarity retrieval" or "sketch retrieval," the query image is provided by the user either as a sketch of the object, as the output of a scanner or a video camera. Some of the difficulties associated with content based image query are described in [1], e.g. significant difference between the "query image" and the "target image," artifacts and poor resolution of the query image make a straightforward comparison of images using L1 and l2 metrics not effective.

In [2] a new strategy is suggested based on wavelet decomposition …

Spring 1998, Wmpg 90.9 Fm

WMPG Program Guides

WMPG program guide for Spring 1998

Includes notes from Program Director, information on shows and events, and schedule.

Fall 1998, 90.9 Wmpg Fm

WMPG Program Guides

No abstract provided.

Fighting Back In Hard Times: The 1990 Strike In Waterford Crystal, Eddie Conlon

Conference papers

No abstract provided.

Fm 34-54, Technical Intelligence, 30 January 1998, Robert Bolin , Depositor

United States Department of Defense Military Intelligence

This manual defines and describes the technical intelligence mission. It names the key technical intelligence organizations involved at the national level and their interrelationships and responsibilities.

The manual describes in detail the technical intelligence organizations and operations in a US command in the field. It discusses at length the responsibilities on the key staff sections in the command.

It has extensive appendices explaining forms and procedures used by forces in the field. It has an excellent list of acronyms and glossary.

Comment by the depositor

A clear understanding of the evolution of technical intelligence may not be needed by the …

Stratospheric Loading Of Sulfur From Explosive Volcanic Eruptions, Gregg J. Bluth, William I. Rose, Ian E. Sprod, Arlin J. Krueger

Department of Geological and Mining Engineering and Sciences Publications

This paper is an attempt to measure our understanding of volcano/atmosphere interactions by comparing a box model of potential volcanogenic aerosol production and removal in the stratosphere with the stratospheric aerosol optical depth over the period of 1979 to 1994. Model results and observed data are in good agreement both in magnitude and removal rates for the two largest eruptions, El Chicho´n and Pinatubo. However, the peak of stratospheric optical depth occurs about nine months after the eruptions, four times longer than the model prediction, which is driven by actual SO2 measurements. For smaller eruptions, the observed stratospheric perturbation is …

Fall 1997, Wmpg 90.9

WMPG Program Guides

WMPG program guide for Fall 1997

Includes notes from Program Director, information on shows and events, and schedule.

Detection Of Volcanic Ash Clouds From Nimbus 7/Total Ozone Mapping Spectrometer, C. J. Seftor, N. C. Hsu, J. R. Herman, P. K. Bhartia, O. Torres, William I. Rose, David J. Schneider, N. Krotkov

Department of Geological and Mining Engineering and Sciences Publications

Measured radiances from the Version 7 reprocessing of the Nimbus 7/total ozone mapping spectrometer (TOMS) 340- and 380-nm channels are used to detect absorbing particulates injected into the atmosphere after the El Chichon eruption on April 4, 1982. It is shown that while the single-channel reflectivity determined from the 380-nm channel is able to detect clouds and haze composed of nonabsorbing aerosols, the spectral contrast between the 340- and 380-nm channels is sensitive to absorbing particulates such as volcanic ash, desert dust, or smoke from biomass burning. In this paper the spectral contrast between these two channels is used to …

Decision Boundary Analysis Feature Selection For Breast Cancer Diagnosis, Daniel W. Gregg

Theses and Dissertations

The general pattern recognition problem always involves the extraction of features to be used in pattern classification. There are no theoretical limitations to the number of features which can be obtained for a given pattern recognition problem. This research will develop a correlation procedure for screening a large feature set without the use of a trained classifier. The results will be compared to established saliency metrics such as the Fisher ratio and derivative-based techniques such as Ruck's saliency.

Winter/Spring 1997, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

Summer 1997, 90.9 Wmpg Fm

WMPG Program Guides

"WMOG Bares it All! Live Broadcasts in Public"

Anatomy Of A Strike: Waterford Glass 1990, Eddie Conlon

Conference papers

No abstract provided.

The Down Survey Of Ireland, Frank Prendergast

Books/Book Chapters

No abstract provided.

Arts, Computers And Artificial Intelligence, Sol Neeman Ph.D.

Engineering Studies Faculty Publications and Creative Works

Science and art seem to belong to different cultures. Science and technology, mainly the products of the intellect, use terminology and vocabulary that are concise and well defined. In contrast, in artistic expression, ambiguity is a powerful component. Still the relationship between these two different categories of human activity is interesting and fascinating. In this paper, a general comparison of these two disciplines will be introduced. Then the possibility of mechanical creation of art using computers and artificial intelligence will be discussed. This will be followed by two techniques which are used to create poetry and music. First, a statistical …

Remote Sensing Of Volcanic Ash Clouds Using Special Sensor Microwave Imager Data, David J. Delene, William I. Rose, Norman C. Grody

Department of Geological and Mining Engineering and Sciences Publications

Measurements from the satellite-based special sensor microwave imager (SSM/I) were used to collect passive microwave radiation (19–85 GHz) for the August 19, 1992 (UT date), Crater Peak/Spurr volcanic cloud. This eruption was also imaged by a ground-based C-band radar system at Kenai, Alaska, 80 km away, and by the thermal infrared channels of the polar-orbiting advanced very high resolution radiometer (AVHRR). The SSM/I sensor detects scattering of Earth-emitted radiation by millimeter size volcanic ash particles. The size of ash particles in a volcanic ash cloud can be estimated by comparing the scattering at different microwave frequencies. The mass of particles …

Measurements Of The Complex Dielectric Constant Of Volcanic Ash From 4 To 19 Ghz, R. J. Adams, Warren F. Perger, William I. Rose, A. Kostinski

Department of Geological and Mining Engineering and Sciences Publications

Dielectric data in volcanic ash at weather radar wavelengths (centimeter range) are extremely sparse and are crucial for radar sensing of ash clouds and for imaging of volcanic terrains. This study extends previous data to include a wavelength range of 1.5–7.5 cm and volcanic ash compositions of 50–75% silica. The real part of the complex permittivity, ε′, of volcanic ash is 6 ± 0.5 (1σ) for all wavelengths. The imaginary part, ε″, ranges from 0.08 to 0.27. Both ε′ and ε″ show higher values at lower SiO2 concentration. It is safe to assume in any weather radar applications that the …

Winter 1996, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

Summer 1996, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

Fall 1996, 90.9 Wmpg Fm

WMPG Program Guides

No abstract provided.

Incorporating Matlab's Signal Processing Toolbox Into A Dsp Course At An Undergraduate E.E. Program, Sol Neeman Ph.D.

Engineering Studies Faculty Publications and Creative Works

This paper provides some suggestions for incorporating MATLAB's Signal Processing Toolbox into a DSP course. Often, in a DSP course, students have difficulties understanding abstract and non-intuitive concepts and seeing their relevance to the practical part of their curriculum. The tools offered by MATLAB's Signal Processing Toolbox, can help to make these concepts more tangible and provide a perspective for students. Some basic tools relevant to an undergraduate DSP course will be introduced, including examples of tool use and graphic results. The tools presented will be applied in the areas of synthesis and analysis of signals, FFT computation, impulse response …

The Effects Of Telephone Technology On Saudi Arabian Society, Khalid I. Otibi

Dissertations and Theses @ UNI

The current research explores the significance of the introduction of telephone technology into Saudi Arabia. The problem addressed by the research was to identify and describe the cultural and economic significance that the telephone has had in Saudi Arabia. The purpose of the research was specifically to study the significance that telephone technology has in the three areas of family ties, business, and transportation. The methodology began with the development a data-collection document. An English version of the document was administered as a pilot test to students at the University of Northern Iowa. This pilot test revealed that the document …

A Comparison Of Measurement Reliability Between A Sonic Digitizer And A Tape Measure On A Complex Three-Dimensional Object, Diane Darlene (Wheeler) Schou

Dissertations and Theses @ UNI

Digitizers and scanners have begun to replace traditional devices for measuring three dimensional objects. However, there is a shortage of relevant research to compare digitizer tools with other measuring devices. The objective of this study was to compare the measurement reliability of a sonic digitizer to a traditional measuring tool, the tape measure, for measuring a complex, three-dimensional object. It was hypothesized that:

1. H₁ Data from measurements with the digitizer vary less than data from measurements with a tape measure at the 0.05 level of significance.
2. H₂ The data from eight complex surface measurements taken with a digitizer …

Aliasing Reduction In Staring Infrared Imagers Utilizing Subpixel Techniques, Joseph C. Gillette, Thomas M. Stadtmiller, Russell C. Hardie

Electrical and Computer Engineering Faculty Publications

We introduce and analyze techniques for the reduction of aliased signal energy in a staring infrared imaging system. A standard staring system uses a fixed two-dimensional detector array that corresponds to a fixed spatial sampling frequency determined by the detector pitch or spacing. Aliasing will occur when sampling a scene containing spatial frequencies exceeding half the sampling frequency. This aliasing can significantly degrade the image quality. The aliasing reduction schemes presented here, referred to as microscanning, exploit subpixel shifts between time frames of an image sequence. These multiple images are used to reconstruct a single frame with reduced aliasing. If …

Spring 1995, 90.9 Wmpg Fm

WMPG Program Guides

No abstract provided.

Fall 1995, 90.9 Wmpg Fm

WMPG Program Guides

No abstract provided.

Summer 1995, 90.9 Wmpg Fm

WMPG Program Guides

No abstract provided.