Digital Commons Network^™

The Effects Of Luminance Boundaries On Color Perception, Richard E. Kronauer, Charles F. Stromeyer Iii, Alex Chaparro

Publications

The luminance and red-green chromatic detection mechanisms respond to, respectively, the sum and difference of the long-wave (L) and middle-wave (M) zone contrast signals. The most-detectable stimulus is not a small patch of luminance drifting grating, as suggested by others, but rather a small, foveal red-green chromatic flash. Even at the smallest test size examined, 2.3' diameter, the red-green mechanism i~s more sensitive than the luminance mechanism, which has profound implication for visual physiology. When a suprathreshold luminance flash (a pedestal) occurs coincidentally with a red-green chromatic flash, detection of color is facilitated ~2-fold, regardless of spot size, as shown …

An Alternative Representation Of The Ice Canopy For Calculating Microwave Brightness Temperatures Over A Thunderstorm, Bradley M. Muller, Henry E. Fuelberg, Eric A. Smith

Publications

Passive microwave brightness temperatures (T(B)'s) at 92 and 183 GHz from an aircraft thunderstorm overflight are compared with values calculated from radar-derived hydrometeor profiles and a modified proximity sounding. Two methods for modeling particles in the ice canopy are contrasted. The first is a ''traditional'' approach employing Marshall-Palmer ice spheres. The second, or ''alternative,'' method partitions 20% of the ice water content into a Marshall-Palmer component for graupel and hail, and 80% into a modified gamma spherical particle size distribution function representing ice crystals.

Results from the alternative approach are superior to those from the traditional method in the anvil …

Educational Requirements Of Omaha Area Engineering, Scientific And Technical Companies, Center For Public Affairs Research (Cpar)

Publications

Educational requirements questionnaire tabulations.

The Ksr1: Experimentation And Modeling Of Poststore, Amy Apon, E Rosti, E Smirni, T D. Wagner, M Madhukar, L W. Dowdy

Publications

Kendall Square Research introduced the KSRl system in 1991. The architecture is based on a ring of rings of 64bit microprocessors. It is a distributed, shared memory system and is scalable. The memory structure is unique and is the key to understanding the system. Different levels of caching eliminates physical memory addressing and leads to the ALLCACHE TM scheme. Since requested data may be found in any of several caches, the initial access time is variable. Once pulled into the local (sub)cache, subsequent access times are fixed and minimal. Thus, the KSRl is a Cache-Only Memory Architecture (COMA) system. This …

Journal Of The Community Development Society Vol. 24, No. 02, Robert F. Blair

Publications

The journal of the Community Develojnnent Society has a responsibility to disseminate information on the theory, research and practice of community development. To fulfill this function the Journal needs to be read by more than subscribers. One way to ensure that the Journal is widely read and cited in research is by having it adequately indexed and abstracted. This issue has been discussed by Society members and members of the Editorial Board. Research on where the journal is indexed was initiated by Phil Favero and completed by editorial staff. Opposite the inside back cover is the list of indexing and …

Galactic Structure From Faint Stromgren Photometry: The Catalog Of Observations, Ted A. Von Hippel

Publications

We have initiated the faint photometric survey in the Stromgren system covering about 1 square degree and including 1238 objects in order to develop samples which best probe the thick disk population. The catalog of observations are presented here. They were acquired without kinematic or metallicity biases and are complete to V=17.3-18.5, depending on the field, for 810 early to relatively late type stars. Photometric metallicities were derived for 508 stars and indicate a metal-poor stellar population, consistent with a mixture of thick disk and halo stars. While the Stromgren u-band was not part of the survey, follow-up u-band observations …

Seasonal And Latitudinal Variations Of Gravity Wave-Driven Fluctuations In Oh Nightglow, Michael P. Hickey Ph.D., R. L. Walterscheid, G. Schubert

Publications

The seasonal and latitudinal variations of the gravity wave-driven fluctuations in the OH nightglow are investigated theoretically using a model that accounts for emission from an extended OH layer and includes the effects of eddy diffusivities in the gravity wave dynamics. The mean (unperturbed) state is obtained from a two-dimensional, nighttime model so that mean-state number densities, temperatures and eddy diffusivities are all self-consistent. Seasonal and latitudinal variations in the background OH nightglow emission and in the propagation and dissipation characteristics of the gravity waves influence how the OH nightglow modulations due to gravity waves depend on season and latitude. …

Sic Particles From Asymptotic Giant Branch Stars: Mg Burning And The S-Process, Lawrence E. Brown, Donald D. Clayton

Publications

The question of whether isotopically anomalous SiC particles found in meteorites originate in AGB stars is addressed. It is shown that if the peak helium shell flash temperatures of massive (6-9 solar masses) stars are about 10 percent larger than they are normally assumed to be, alpha particle reactions with the magnesium will become significant. Then the (Mg-29)(alpha, n)Si-29 reaction produces a large excess of Si-29. With a light element nuclear reaction network, the evolution of the silicon isotopic composition during AGB evolution is calculated. It is found that the experimentally determined correlation between excess Si-29 and excess Si-30 in …

Mayflies (Ephemeroptera), Stoneflies (Plecoptera) And Other Interesting Biota Of Wildcat Creek, South Carolina, A Biodiversity Reference Stream., Susan M. Daniels, John C. Morse

Publications

The Wildcat Creek catchment, in the upper Piedmont region of South Carolina, is being considered for special protection to preserve its biological diversity. To help assess thi diversity, specimens of mayfly(Ephemeroptera) and stonefly (Plecoptera) nymphs were collected and identified to the lowest taxonomic level possible with currently published information.

Water Supply Alternatives For Oconee County, South Carolina, 1991-2020, 1992 January, James C. Hite -1941, Lawrence J. Beran, Robert H. Neal

Publications

No abstract provided.

The Community Leader's Letters, Vol. 3, No. 3, 1992 Fall, Author Unknown

Publications

Quarterly publication on news and views for South Carolina's grassroots leaders.

Global Warming: A Comprehensive Approach, Lakshman Guruswamy

Publications

No abstract provided.

Use Of A Commercially Available Flight Simulator During Aircrew Performance Testing, S. A. Shappell, B. J. Bartosh

Publications

Investigations of aircrew sustained operations (SUSOPS) have been criticized for employing tasks with no apparent external validity. Because measures obtained directly from aviators flying high-performance aircraft are difficult to obtain, a laboratory compromise is needed. High-fidelity flight simulators used for aircrew training offer the most realistic simulation, but their availability is limited. Personal computer-based flight simulators may provide adequate simulation in, the laboratory at a reasonable cost. This report describes a representative research protocol using a commercially available flight simulator during a simulated aircrew SUSOP.

Biodegradation Of Dichloromethane And Its Utilization As A Growth Substrate Under Methanogenic Conditions, David L. Freedman, James M. Gossett

Publications

Biodegradation of dichloromethane (DCM) to environmentally acceptable products was demonstrated under methanogenic conditions (35 degrees C). When DCM was supplied to enrichment cultures as the sole organic compound at a low enough concentration to avoid inhibition of methanogenesis, the molar ratio of CH4 formed to DCM consumed (0.473) was very close to the amount predicted by stoichiometric conservation of electrons. DCM degradation was also demonstrated when methanogenesis was partially inhibited (with 0.5 to 1.5 mM 2-bromoethanesulfonate or approximately 2 mM DCM) or completely stopped (with 50 to 55.5 mM 2-bromoethanesulfonate). Addition of a eubacterial inhibitor (vancomycin, 100 mg/liter) greatly reduced …

Gravity Wave-Driven Fluctuations In Oh Nightglow From An Extended, Dissipative Emission Region, G. Schubert, R. L. Walterscheid, Michael P. Hickey Ph.D.

Publications

The theory of gravity wave-driven fluctuations in the OH nightglow from an extended source region is generalized to account for effects of eddy kinematic viscosity ν and eddy thermal diffusivity κ. In the nondiffusive case, the amplitudes and phases of vertically integrated normalized intensity 〈δI〉/〈Ī〉 and temperature 〈δTI〉/〈ĪI〉perturbations and vertically integrated Krassovsky's ratio 〈η〉 as functions of period are influenced by the upper limit of vertical integration of the extended source, especially at long periods when vertical wavelengths λᵥ are small. The effects, which include oscillations in 〈δT〉/〈Ī〉 , and 〈η〉, particularly at long …

Education Reform In The United States, 1991 July, J. Stanley Marshall (James Stanley) 1923-2014

Publications

No abstract provided.

1991 Revisions To The 1962 Master Plan: California Polytechnic State University, San Luis Obispo, Grant Pederson Phillips, Architects

Publications

1991 revisions to the 1962 Master Plan of the Cal Poly, San Luis Obispo campus. Includes campus core map and farm map (2 maps total). Master Plan Enrollment = 15,000 FTE.

Improving Public Education In Nebraska, Center For Public Affairs Research (Cpar)

Publications

In 1990, the Greater Omaha Chamber of Co=erce created a study group to examine public elementary and secondary education in Nebraska. The study group was composed of representatives of the business co=unity, educators, and members of the Unicameral. Five work sessions were held to listen to experts discuss the approaches being used by other states to improve education, to discuss the applicability of such approaches to our state, and to identify a set of activities that would assure that pupils throughout Nebraska would be able to compete successfully with other young people in this country and around the world.

Energy And The Environment: Confronting Common Threats To Security, Lakshman Guruswamy

Publications

No abstract provided.

The Luminosities Of Bright H N Regions In Ngc 628 And Its O Star Formation Rate, Ted Von Hippel, Greg Bothun

Publications

Using narrow band CCD imaging we have identified 183 bright H n regions in the Sc galaxy NGC 628. These H n regions have luminosities which indicate that they are powered by young star clusters which contain ^ 100 ionizing stars. We attempt to reproduce the H ii region LF with and without models including stellar evolution. We find stellar evolution an important parameter in understanding the H n region LF and find that it allows star-forming galaxies to be more robust to star bursting episodes. Ranking the H n regions by luminosity and assuming that luminosity evolution is due …

Municipal Water Demand Forecasts By Sectors: Oconee County, South Carolina, 1990-2020, 1990 April, Janardan Bikram Khatri-Chhetri, James C. Hite -1941

Publications

No abstract provided.

A Simulation And Diagnostic Study Of Water Vapor Image Dry Bands, Bradley M. Muller, Henry E. Fuelberg

Publications

A Limited Area Mesoscale Prediction System (LAMPS) model simulation and special 3-hour radiosonde dataset are used to investigate warm (dry) bands in 6,7 μm water vapor satellite imagery on 6–7 March 1982. The purpose is to reveal processes resulting in the formation and evolution of the dry features that appear as curving dark streaks in the imagery. Model soundings are input to a radiative transfer algorithm to generate synthetic 6.7 μm equivalent blackbody temperatures (TB) which are compared with those from the Visible infrared Spin Scan Radiometer Atmospheric Sounder aboard the Geostationary Operational Environmental Satellite. Simulated and radiosonde-derived vertical velocity …

Global Warming: Integrating United States And International Law, Lakshman D. Guruswamy

Publications

No abstract provided.

Biological Reductive Dechlorination Of Tetrachloroethylene And Trichloroethylene To Ethylene Under Methanogenic Conditions, David L. Freedman, James M. Gossett

Publications

A biological process for remediation of groundwater contaminated with tetrachloroethylene (PCE) and trichloroethylene (TCE) can only be applied if the transformation products are environmentally acceptable. Studies with enrichment cultures of PCE- and TCE-degrading microorganisms provide evidence that, under methanogenic conditions, mixed cultures are able to completely dechlorinate PCE and TCE to ethylene, a product which is environmentally acceptable. Radiotracer studies with [14C]PCE indicated that [14C]ethylene was the terminal product; significant conversion to 14CO2 or 14CH4 was not observed. The rate-limiting step in the pathway appeared to be conversion of vinyl chloride to ethylene. To sustain reductive dechlorination of PCE and …

The State Of Black Omaha: 1989, Center For Public Affairs Research (Cpar)

Publications

Creation of an economic base is necessary for the continued growth and development of any society or community. It is of utmost importance within Black neighborhoods in our urban center because they have Jacked representative economic development. They have been depleted as a result of a "dollar drain," through which money leaves Black communities and strengthens White communities. This drain must be halted. Economic enterprise must be created in Black communities, such as employment opportunities for the unemployed and underemployed to foster family stabilization, and neighborhood beautification projects that can provide jobs and an improved environment.

1988-1989 Revisions To The 1962 Master Plan: California Polytechnic State University, San Luis Obispo, Facilities Planning And Capital Projects, California Polytechnic State University - San Luis Obispo

Publications

1988 and 1989 revisions to the 1962 Master Plan of the Cal Poly, San Luis Obispo campus. Includes campus core, farm maps, and legend. 7 maps and 1 legend. Master Plan Enrollment = 15,000 FTE.

Star: A Computerized Tutorial In General Psychology, Barbara S. Chaparro, Charles G. Halcomb

Publications

This study investigated the use of a computerized tutorial--Self-Test and Review (STAR)--in a computer-managed general psychology course. STAR consists of four major modules which provide the student with a variety of learning exercises, including practice quizzes, practice final exams, performance reviews, and structured study questions. The purpose of the study was to determine whether students would choose STAR as a study tool, the effect of lecture versus self-paced settings on the use of STAR, whether students who used STAR would perform better than those who did not, and the effect of the timing of feedback in STAR on performance. Students …

An Evaluation Of The Gain From Interbasin Water Transfers In A Coastal Area Of South Carolina, 1988 September, Janardan Bikram Khatri-Chhetri, James C. Hite -1941, James Cyprian Okuk Nyankori, Mark Henty, Myles Wallace

Publications

No abstract provided.

A Working Catalogue Of Herbig Haro Objects, Ted Von Hippel, S.J. Bell Burnell, P.M. Williams

Publications

We present a catalogue of 184 Herbig Haro objects from a literature search complete to 1987.5. It is intended to update the 1974 catalogue of Herbig. The catalogue contains accurate co-ordinates, proper motions, radial velocities and spectral information for these objects. A cross-reference to the two best finding charts is included. A grouping of Herbig Haro objects into is also listed.

Bridging The Gap Between Object-Oriented And Logic Programming, Timothy Koschmann, Martha Walton Evans

Publications

A description is given of an interface that was developed between Loops and Xerox Quintus Prolog. Loops is an extension to the Xerox AI environment to support object-oriented programming; Xerox Quintus Prolog is a version of Prolog that runs on Xerox Lisp machines. Such a bridge enables all the support tools of both environments to be accessed, and degradation of performance that occurs when one language is implemented top of another is avoided. The interface has three layers. At the lowest level, a set of Prolog predicates gives the Prolog programmer access to Loops objects. This lowest level is the …