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Blizzard Watch : Plant Sciences : 1998-1999

Blizzard Watch Newsletter

Newsletter for the Department of Plant Sciences.

On 2-Reptiles In The Plane, Sze-Man Ngai, Víctor F. Sirvent, J. J. P. Veerman, Yang Wang

Mathematics and Statistics Faculty Publications and Presentations

We classify all rational 2-reptiles in the plane. We also establish properties concerning rational reptiles in the plane in general.

Geometrical Models For Grain Dynamics, Giovani L. Vasconcelos, J. J. P. Veerman

Mathematics and Statistics Faculty Publications and Presentations

We study models for the gravity-driven, dissipative motion of a single grain on an inclined rough surface. Imposing some conditions on the momentum loss due to the collisions between the particle and the surface, we arrive at a class of models in which the grain dynamics is described by one-dimensional maps. The dynamics of these maps is studied in detail. We prove the existence of various dynamical phases and show that the presence of these phases is independent of the restitution law (within the class considered).

Geometrical Model For A Particle On A Rough Inclined Surface, Giovani L. Vasconcelos, J. J. P. Veerman

Mathematics and Statistics Faculty Publications and Presentations

A simple geometrical model is presented for the gravity-driven motion of a single particle on a rough inclined surface. Adopting a simple restitution law for the collisions between the particle and the surface, we arrive at a model in which the dynamics is described by a one-dimensional map. This map is studied in detail and it is shown to exhibit several dynamical regimes (steady state, chaotic behavior, and accelerated motion) as the model parameters vary. A phase diagram showing the corresponding domain of existence for these regimes is presented. The model is also found to be in good qualitative agreement …

Adaptive Resource Management Via Modular Feedback Control, Ashvin Goel, David Steere, Calton Pu, Jonathan Walpole

Computer Science Faculty Publications and Presentations

A key feature of tomorrow’s operating systems and runtime environments is their ability to adapt. Current state of the art uses an ad-hoc approach to building adaptive software, resulting in systems that can be complex, unpredictable and brittle. We advocate a modular and methodical approach for building adaptive system software based on feedback control. The use of feedback allows a system to automatically adapt to dynamically varying environments and loads, and allows the system designer to utilize the substantial body of knowledge in other engineering disciplines for building adaptive systems. We have developed a toolkit called SWiFT that embodies this …

Feedback Based Dynamic Proportion Allocation For Disk I/O, Dan Revel, Dylan Mcnamee, Calton Pu, David Steere, Jonathan Walpole

Computer Science Faculty Publications and Presentations

In this paper we propose to use feedback control to automatically allocate disk bandwidth in order to match the rate of disk I/O to the real-rate needs of applications. We describe a model for adaptive resource management based on measuring the relative progress of stages in a producer-consumer pipeline. We show how to use prefetching to transform a passive disk into an active data producer whose progress can be controlled via feedback. Our progress-based framework allows the integrated control of multiple resources. The resulting system automatically adapts to varying application rates as well as to varying device latencies.

Hi-O-Hi 1999, Oberlin College

Hi-O-Hi Yearbooks

No abstract provided.

Discrimination In The Laws Of Information Warfare, Mark R. Shulman

Elisabeth Haub School of Law Faculty Publications

No abstract provided.

A Distributed Algorithm For The Classification Of Images On A Network Of Workstations, S. R. Subramanya

Electrical and Computer Engineering Faculty Research & Creative Works

Image databases require content-based queries and retrievals. Fast and accurate retrievals for user queries depend on efficient indexing and searching schemes. The classification of images into different categories (classes) is an important task which facilitates the indexing and searching process. The classification of huge amounts of image data place enormous demands on computational requirements. Network of workstations (NOWs, also sometimes called clusters) are a cost-effective way of providing the much-needed computational power in such applications. This paper presents a distributed scheme for the classification of images in an image database, using a network of workstations. The results of the classification …

Evaluation Of Stream Depletion Considering Finite Stream Width, Shallow Penetration, And Properties Of Streambed Sediments, Vitaly A. Zlotnik, Huihua Huang, James J. Butler Jr.

Department of Earth and Atmospheric Sciences: Faculty Publications

Commonly used methods for estimation of pumping-induced stream depletion are based on a series of idealistic assumptions about the stream-aquifer interface. In many cases, however, these assumptions are not consistent with field conditions. In order to obtain stream-depletion estimates that are based on assumptions more appropriate for conditions often faced in the field, a new analytical model is proposed. This model, which incorporates the effects of finite stream width, shallow stream penetration, and a low permeability streambed, is based on the Dupuit assumptions and a steady-state representation of flow across the streambed. A general solution for stream depletion is developed …

Lethal Sandslides From Eolian Dunes, David B. Loope, Joseph A. Mason, Lowell Dingus

Department of Earth and Atmospheric Sciences: Faculty Publications

Fossil vertebrates entombed within the Upper Cretaceous Djadokhta Formation of southern Mongolia bear testimony to a heretofore unknown geologic phenomenon: mass wasting of eolian dunes during heavy rainstorms. Evaporation of shallow-penetrating rainwater led to progressive calcite accumulation in a thin layer of sand about 0.5 m below the surface of dune lee slopes. During rare heavy rainstorms, a perched water table developed at the top of calcitic zones. Positive pore water pressure led to translational slides and fast-moving sediment gravity flows that overwhelmed animals on the lee slopes of large dunes and in interdune areas.

Using Data Envelopment Analysis For Evaluating Alternative Software Development Process Configurations, Timothy R. Anderson, Peter K. Ghavami

Engineering and Technology Management Faculty Publications and Presentations

Summary form only given as follows. The goal of achieving better software depends on improvements in software development processes. This paper provides a nonparametric, quantitative methodology for evaluating alternative software development process configurations as a tool for process improvement. The methodology uses data envelopment analysis (DEA) for comparing the impact of varying degrees of software inspection on project schedule, cost and quality. Since every phase of the development process can be inspected at varying levels, a large number of process combinations become possible. Thus a manager's job to compare and select an efficient process configuration can become tedious. This is …

Brownfield Redevelopment Strategies For Gary, In,, Kirstin Toth, Donald T. Iannone

All Maxine Goodman Levin School of Urban Affairs Publications

The Great Lakes Environmental Finance Center conducted a technical assistance workshop for Gary, Indiana officials on June 29, 1999. This workshop represented an important step in the city’s efforts to address its brownfields cleanup and redevelopment needs. The city has begun its participation in a regionally-awarded brownfields pilot grant from the U.S. Environmental Protection Agency (EPA). The workshop agenda focused discussion on overcoming the barriers to brownfields redevelopment and the financing basics of brownfields redevelopment. These topics were discussed in the context of the redevelopment of the Airport Development Zone and a major area of Gary’s waterfront.

How The Supreme Court's Reiteration Of Sexual Harassment Standards Affirmed In Faragher And Ellerth Would Have Led To Jones' Survival In Jones V. Clinton, Moira Mcandrew

Cleveland State Law Review

This note demonstrates that a cognizable claim of sexual harassment may be predicated on a severe, yet isolated episode of sexual harassment. In this inquiry, we will look to other Supreme Court and Appellate Court decisions regarding sexual harassment law to support the conclusion that a single incident of sexual harassment can constitute an actionable hostile work environment claim. Part II traces the background of sexual harassment law, including what constitutes actionable discrimination and the applicable standards of a hostile work environment claim. Part III outlines the Supreme Court's analysis of actionable employment discrimination based on sexual harassment under Title …

The Writings Of Russell Sturgis And Peter B. Wight: The Victorian Architect As Critic And Historian, Marjorie A. Pearson

Dissertations, Theses, and Capstone Projects

The focus of this dissertation is on the writings of Russell Sturgis (1836–1909) and Peter B. Wight (1838–1925). As part of a movement that professionalized the practice of architecture in the United States, they brought an awareness of the role of architecture to a larger public, both through their buildings and their writings. Their joint beginnings in the American Pre-Raphaelite movement led to their journalistic endeavors in the New Path, published between 1863 and 1865 in New York City. As proselytizers for Ruskinianism in their architectural work and words, this pervasive force was to remain an important influence throughout their …

Simulation Of Optimal Drive Systems Consisting Of Gear-Cam Mechanisms With Brushless Dc Servomotors, Norbert Fritz

Dissertations and Theses @ UNI

This study presents the development of flexible tools for the numerical simulation of processing machine drives that consist of servomotors, mechanisms, and machine tools. The simulation allows predicting the motions or vibrations of linkages, forces and torques in joints, motor currents, and system response times as well as evaluating stability and characteristic frequencies of the drive system The simulation tools were implemented as macro components in macro component libraries using the EASY5* Dynamic System Modeling, Simulation, and Analysis software by the Boeing Company. Application of the developed macro components allows fast and efficient modeling of a variety of different drive …

The Development Of The Meanings Of Think And Know Through Conversation, Lea Kessler Shaw

Dissertations, Theses, and Capstone Projects

An apparent discrepancy in the literature on mental verbs between findings of experimental studies (young children fail to contrast terms) and observational studies (children use terms correctly in conversation) can be reconciled using Nelson and Lucariello's (1985) theory of word meaning development. According to their analysis, three aspects of word meaning develop in order: reference, denotation, and sense. For success at experimental tasks, children must have attained a system of interrelated word meanings (sense). However, children's initial uses of think and know take their meanings from the roles in the language games in which they occur (Wittgenstein, 1953).

In this …

The Efficiency And Effectiveness Of Self-Monitoring For Increasing Fourth Graders' Work Completion, Stacy S. Jeffrey

Dissertations and Theses @ UNI

This research study investigated the efficiency and effectiveness of self-monitoring as an individual intervention technique. Data were collected for 10 weeks in a public elementary school in a small city in central Iowa. The subjects were 1 fourth-grade regular classroom teacher and 1 of her students and 1 special education teacher and 1 student from a fourth-grade regular classroom in which the special education teacher team-taught. Both teachers had willingly volunteered to participate in the research study and later identified a student in their class who had low rates of work completion. None of the 4 subjects had received formal …

Degradation Of Explosives In Solution Using Bacteria, A Fungus (Phanerochaete Chrysosporium), Titanium Dioxide, Ozone, And Electrochemical Peroxidation, Stéphane Debost

Dissertations and Theses @ UNI

As a result of munitions manufacturing and decommissioning, explosive compounds have contaminated groundwater and soils at many sites throughout the U.S. and worldwide. Three of the most commonly occurring explosive contaminants are TNT, ROX, and HMX. Many processes, biological as well as physical, have been developed to remediate the contaminated material. But feasibility studies rarely take into account the three contaminants at once. We chose four of the technologies used to remediate explosives-contaminated water and studied comparatively their effectiveness and efficiency in degrading TNT, ROX, and HMX in solution at their maximal solubilities. The chosen technologies were bacterial and fungal …

Machine Vision Routines For Finding Objects Guided By A Pointer, Jade Yang

Theses and Dissertations

No abstract provided.

Factors That Enhance The Effectiveness Of Collaborative Learning In Preschool-Aged Children, Catherine M. Palmer

Theses and Dissertations

No abstract provided.

The Stm Algorithm For 3-Cnf Satisfiability Problem, Chun H. Ng

Theses and Dissertations

No abstract provided.

The Effect Of Socially Relevant And Physiological Threat Stimuli On Psychophysiological Responses In Anxiety Sensitive Individuals, Jason P. Ediger

Theses and Dissertations

No abstract provided.

Construction And Calibration Of A Laser Induced Breakdown Spectroscopy Instrument For Measuring Metals Contamination In Soil, Ames A. Grisanti

Theses and Dissertations

No abstract provided.

Historical Essays On Meteorology, 1919-1995, Theodore S. Feldman

Faculty Publications

No abstract provided.

Importance Of Convection And Damping On Rates Of Convergence For The Lax-Wendroff Method, Joseph Kolibal

Faculty Publications

It is well known that in solving steady state problems using hyperbolic time-stepping methods the intent is to drive the transients to zero as quickly as possible. In this paper the convergence to steady state of the Lax-Wendroff method applied to solving the equations of gas dynamics is analyzed for the Laval nozzle problem by comparing the relative rates of damping and convection using a linearized eigenmode analysis. This analysis is developed for the simpler isenthalpic system and then extended to the full Euler equations. Finally, this allows a comparison between these systems. For both models, useful analytical information can …

An Assessment Of Authorship And Publication Patterns By Gender In The Armed Forces And Society Journal, And The Journal Of Peace Research, 1974-1999, Amy C. Yerkes

Theses and Dissertations

No abstract provided.