Digital Commons Network^™

Characterization Of Solvent-Extractable Hydrocarbons From Airborne Particulates And Street Dust Of Kuala Lumpur, Nasr Yousef M. J. Omar

Student Works (2000-2009)

The solvent-extractable hydrocarbons were identified in PM 10 airborne particles and roadside soil particles collected at eight locations in the city center and the suburb of Kuala Lumpur, Malaysia during the period from November 1998 to January 1999. Airborne particles were collected using high-volume PM1o sampler on glass fiber filters over 24 h average sampling period. After ultrasonic agitation with dichloromethane, the extracts were concentrated and fractionated on an alumina-silica column into three major fractions (aliphatics, aromatics and polar compounds). The aliphatics and aromatics fractions were then subjected to gas chromatography-mass spectrometric (GCMS) analysis. The major hydrocarbons identified in these …

Break Out Session: The Future Of White Dwarf Observing, Ted Von Hippel

Publications

On Thursday, June 15, 2000 the conference participants joined on of four afternoon break out sessions. Our break out session was charged with addressing the the following questions: Astronomy is changing. Eight to ten meter telescopes looking towards the edge of the Universe will dominate the astronomical landscape. Queue scheduling, large surveys, and the current emphasis towards the red end of the spectrum will also affect us. What consequences do these changes imply for our field? How can we convince telescope assignment committees to grand observing time to proposers from our community?

White Dwarfs In Open Clusters: New Tests Of Stellar Evolution And The Age Of The Galaxy, Ted Von Hippel

Publications

White dwarf cooling theory and very deep observations in star clusters provide a new tool to test stellar evolution theory and time scales. In particular, white dwarf cooling theory is now testing the degree of enhanced core mixing in stars with turnoff ages of 1 to 2 Gyr. More generally, I show the good overall agreement between white dwarf and modern isochrone ages over the range 0.1 to 4 Gyr.

White Dwarfs In Common Proper Motion Binary Systems: Mass Distribution And Kinematics, Nicole M. Silvestri, Terry D. Oswalt, Matt A. Wood, J. Allyn Smith, I. Neill Reid, Edward M. Sion

Publications

We present the mass distribution, gravitational redshifts, radial velocities, and space motions of white dwarf stars in common proper motion binary systems. The mass distribution we derive for the 41 DA white dwarfs in this study has a mean of 0.68 ± 0.04 M_Ꙩ. This distribution has a slightly higher mean and larger dispersion than most previous white dwarf studies. We hypothesize that this is due to a higher fraction of cool (average T_eff ̴ 10,000 K), hence old, white dwarfs in our sample. Our results indicate that samples made up of predominantly cool, old white dwarf stars …

Fast Incremental Crc Updates For Ip Over Atm Networks, Florian Braun, Marcel Waldvogel

All Computer Science and Engineering Research

In response to the increasing network speeds, many operations in IP routers and similar devices are being made more efficient. With the advances in other areas of packet processing, the verification and regeneration of cyclic redundancy check (CRC) codes of the data link layer is likely to become a bottleneck in the near future. In this paper, we present a mechanism to defer CRC verification without compromising reliability. This opens the possibility of incremental updates of the CRC. We introduce a new high-speed technique and present efficient implementation, speeding up CRC processing by a factor of 15. Although the paper …

Rad Module Infrastructure Of The Field-Programmable Port Extender (Fpx) Version 2.0, David E. Taylor, John W. Lockwood, Naji Naufel

All Computer Science and Engineering Research

The Field-programmable Port eXtender (FPX) provides dynamic, fast, and flexible mechanisms to process data streams at the ports of the Washington University Gigabit Switch (WUGS-20). In order to facilitate the design and implementation of portable hardware modules for the Reprogrammable Application Device (RAD) on the FPX board, infrastructure components have been developed. These components abstract application module designers from device-specific timing specifications of off-chip memory devices, as well as processing system-level control cells. This document describes the design and internal functionality of the infrastructure components and is intended as a reference for future component revisions and additions. Application module designers …

Network Abstractions For Context-Aware Mobile Computing, Gruia-Catalin Roman, Christine Julien, Qingfeng Huang

All Computer Science and Engineering Research

Context-Aware computing is characterized by the ability of a software system to continuously adapt its behavior to a changing environment over which it has little or no control. Previous work along these lines presumed a rather narrow definition of context, one that was centered on resources immediately available to the component in question, e.g., communication bandwidth, physical location, etc. This paper explores context-aware computing in the setting of ad hoc networks consisting of numerous mobile hosts that interact with each other opportunistically via transient wireless interconnections. We extend the context to encompass awareness of an entire neighborhood within the ad …

Indra: A Distributed Approach To Network Intrusion Detection And Prevention, Qi Zhang, Ramaprabhu Janakiraman

All Computer Science and Engineering Research

While advances in computer and communications technology have made the network ubiquitous, they ahve also rendered networked systems vulnerable to malicious attacks orchestrated from a distance. These attacks, usually called cracker attacks or intrusions, start with crackers infiltrating a network through a vulnerable host and then going on to launch further attacks. Crackers depend on increasingly sophisticated techniques like using distributed attack sources. On the other hand, software that guards against them remains rooted in traditional centralized techniques, presenting an easily-targetable single point of failure. Scalable, distributed network intrusion prevention software is sorely needed. We propose Indra - a distributed …

Hyperfine Interaction In The Hydrogen Atom, Ronald Lovett

Topics in Quantum Mechanics

No abstract provided.

Time Evolving States, Ronald Lovett

Topics in Quantum Mechanics

No abstract provided.

Just So Stories: Posnerian Methodology, Jeanne L. Schroeder

Cardozo Law Review

No abstract provided.

A Prototypical Computer Museum, Eric Otto Ryder

USF Tampa Graduate Theses and Dissertations

Civilization seems barely able to keep up with the new information technology. Therefore, I propose a place where the technologies of the future may be interacted with like the comfortable knowledge of the past. I propose a place where technology may be interacted on as in the realm of the past with the doors of the future ahead. The Museum of Science and Industry, where the grasp of our technological history is displayed, would be an ideal site for the creation of a Prototypical Computer Museum. With its close proximity to the University of South Florida, resources and participants would …

Alternate Curriculum In Reading For Grade 4, Carolyn M. Wiezorek

Graduate Research Papers

Academically gifted students are in every classroom. They have a right to be challenged all day, every day. Most curriculum is aimed at the average student, leaving gifted students bored and unchallenged. It is the school's responsibility to meet the needs of these academically gifted students. By differentiating content, process, product and learning environment, teachers can enrich, challenge and better meet the needs of all students. Our district is in the process of creating alternate units for our elementary language arts program. The sixth grade is complete and a team is working on the fifth grade units. Two other teachers …

Cultivating Partnerships/Realizing Diversity, Janice Simmons-Welburn, William C. Welburn

Library Faculty Research and Publications

Academic librarians should not only seek methods for continuous learning about an increasingly diverse college student body, they are encouraged to pursue partnerships with campus agencies that work directly with students, especially those charged with building a diverse community of students. The authors present two examples to illustrate strategies-in-action.

Dynamics Of Pancake Vortices In A Finite Stack Of Superconducting Copper Oxide Layers, Mariam Mustafa Ahmad Al Marzoqi

Theses

The high temperature superconductors are very promising materials in a wide range of applications, starting from the electricity power supply. They play a lifesaving function through imaging systems. Even major internet and communication advances depend on these materials.

Superconductivity in these materials occurs particularly in the copper-oxide planes. However, since these materials are type-II superconductors, magnetic fields can penetrate these materials in quantized amounts of flux called vortices without destroying completely superconductivity, but producing some resistance, due to vortex motion. In order to overcome the resistance problem, vortices must be pinned to prevent their motion and hence eliminate the resistance. …

Determination And Catalytic Degradation Of Some Pesticides In Selected Agriculture Environment, Khalid Mutasim Al Magboul

Theses

Buprofezin [2-[(1, 1-dimethylethyl)imino]tetrahydro-3-(1-methylethyl)-5-phenyl-4H-1,3,5-thiadiazin-4-one] is a thiadiazine insect regulator and molting inhibitor that has a persistent larvicidal action against some Coleoptera and Hemiptera and effectively controls harmful insect pests including the brown rice planthopper Nilaparvata lugens and the greenhouse whitefly Trialeurodes vaporaiorum. However, amitraz (IUPAC name: N-methylbis(2,4-xylyliminomethyl) amine belongs to the family of the triazapentadienes. It is a non-systemic acaricide and insecticide which has contact and respiratory action. Amitraz is active against a wide range of larvae and phytophagous insects. Its properties have long been known. Additionally, amitraz is often used against varroasis disease, caused by the mite Varroa Jacobsoni and …

Assessment Of Metals Pollution In Sediments Of The Coastal Area, U.A.E, By Nawal Mubarak Al Qubaisi

Theses

The present study aims at the quantifying and assessment of heavy metals concentrations and pollution in the offshore sediments, off Abu Dhabi, Dubai and Sharjah. Thirty three samples were collected and subjected to grain size analysis, organic carbon and total carbonate determinations, mineralogical analysis and heavy metals (leachable and residual phasis) determination.

The contents of organic carbon of the study areas vary within a wide range. The maximum was recorded at Abu Dhabi and the minimum at Dubai. There is a trend of increasing organic carbon with the decrease of grain size. In contrast to organic carbon, carbonate contents in …

Eddy Structures Induced Within A Wedge By A Honing Circular Arc, C. P. Hills

Articles

In this paper we outline an expeditious numerical procedure to calculate the Stokes flow in a corner due to the rotation of a scraping circular boundary. The method is also applicable to other wedge geometries. We employ a collocation technique utilising a basis of eddy (similarity) functions introduced by Moffatt (1964) that allows us to satisfy automatically the governing equations for the streamfunction and all the boundary conditions on the surface of the wedge. The circular honing problem thereby becomes one-dimensional requiring only the satisfaction of conditions on the circular boundary. The advantage of using the Moffatt eddy functions as …

Eddies Induced In Cylindrical Containers By A Rotating End Wall, Christopher Hills

Articles

The flow generated in a viscous liquid contained in a cylindrical geometry by a rotating end wall is considered. Recent numerical and experimental work has established several distinct phases of the motion when fluid inertia plays a significant role. The current paper, however, establishes the nature of the flow in the thus far neglected low Reynolds number regime. Explicitly, by employing biorthogonality relations appropriate to the current geometry, it is shown that a sequence of exponentially decaying eddies extends outward from the rotating end wall. The cellular structure is a manifestation of the dominance of complex eigensolutions to the homogeneous …

Analysis Of A Four-Level Dc/Dc Buck Converter, Keith Corzine, J. Yuen, J. R. Baker

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a four-level DC/DC buck converter is introduced. The primary application for this converter is to regulate the center capacitor voltage in a four-level inverter system. The steady-state and average-value models for the proposed converter are developed and compared in simulation. The converter was constructed in the laboratory and verified on a four-level motor drive system. It was shown that the four-level DC/DC converter provides capacitor voltage balancing and allows higher output voltage utilization from the inverter.

Structural, Magnetic, And Mössbauer Spectral Study Of Er₂Fe₁₇ And Its Hydrides, Fernande Grandjean, Olivier Isnard, Dimitri Hautot, Gary J. Long

Chemistry Faculty Research & Creative Works

The structural and magnetic properties of the Er₂Fe₁₇H_x compounds, where x is 0, 1, 2, 3, and 3.8, have been investigated by means of powder x-ray diffraction, thermal and ac magnetic susceptibility measurements, and iron-57 Mössbauer spectroscopy. The Er₂Fe₁₇H_x compounds crystallize in the hexagonal P6₃/mmc space group with the Th₂Ni₁₇-like structure, a structure which has both an iron-rich stoichiometry and disorder of the erbium and iron-iron 4f-4f dumbbell sites. The increase in the lattice parameters, the magnetic ordering temperature, the saturation magnetization, and the …

A Non-Authoritative Educational Metadata Ontology For Filtering And Recommending Learning Objects, David Wiley, Mimi M. Recker

Faculty Publications

Digital libraries populated with learning objects are becoming popular tools in the creation of instructional technologies. Many current efforts to create standard metadata structures that facilitate the discovery and instructional use of learning objects recommend a single, authoritative metadata record per version of the learning object. However, as we argue in this paper, a single metadata record -- particularly one with fields that emphasize knowledge management and technology, while evading instructional issues -- provides information insufficient to support instructional utilization decisions. To put learning objects to instructional use, users must examine the individual objects, forfeiting the supposed benefits of the …

The Automobile Libaility Coverage Step-Down Clause: The Real Deal Or Merely The Calm Before The Storm?, Johnny Parker

Articles, Chapters in Books and Other Contributions to Scholarly Works

No abstract provided.

Love And The Socratic Method, Peter M. Cicchino

American University Law Review

No abstract provided.

University Of San Diego Football Media Guide 2001, University Of San Diego Athletics Department

Football (Men)

48 pages : illustrations, portraits ; 21.5 x 28 cm

Values Education Influence On Elementary Students' Self-Esteem, Ron W. Germaine Edd

Dissertations

The purpose of this study is to determine if there was a significant difference in measures of self-esteem between elementary school students to whom specific values were formally taught in their school as part of the curriculum and those who did not receive such instruction. The setting for the study was a school district in Canada that had identified sixteen values through community consensus. The district developed curriculum and lessons for the teaching of these values. A quasi-experimental research design was utilized. The treatment group was taught values as a formal part of their curriculum for a period of four …

Water Resources Year In Review - Winter 2001, Annis Water Resource Institute

AWRI Reviews

No abstract provided.

University Of San Diego Women's Basketball Media Guide 2000-2001, University Of San Diego Athletics Department

Basketball (Women)

44 pages : illustrations, portraits ; 21.5 x 28 cm

Pricing Options Using Implied Trees, Kian Guan Lim, Da Zhi

Research Collection Lee Kong Chian School Of Business

No abstract provided.

The Investigation Of The Relationship Between Middle School Organizational Health, School Size, And School Achievement In The Areas Of Reading, Mathematics, And Language., Janice Johnston Barth

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of this study is to investigate the relationship between school organizational health, school size, and school achievement in the areas of reading, mathematics, and language as mediated by socioeconomic status (SES) in West Virginia public middle schools during the school year 1999-2000. The study will use the participating schools' free and reduced lunch rate to determine socioeconomic status. Once determined, socioeconomic status will be assumed as a mediating categorical variable and data analysis will determine its effects. The population for this study were the 99 West Virginia middle schools that were configured by the county boards of education …