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2007

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Articles 2791 - 2820 of 6758

Full-Text Articles in Physical Sciences and Mathematics

Alfvénic Accelerated Electrons And Short Burst Auroral Kilometric Radiations Observed By The Fast Satellite, Lun Ma May 2007

Alfvénic Accelerated Electrons And Short Burst Auroral Kilometric Radiations Observed By The Fast Satellite, Lun Ma

Physics Theses

This investigation is motivated by previous study of short burst radiations (S-bursts) reported by Ergun et al. [2006], who suggested two generation mechanisms of S-bursts: one is the electron cyclotron maser instability due to an unstable ring distribution; the other is an upward electron beam generating upper hybrid resonance. The simulation results reported by Su et al. [2007] support the former mechanism. Only one Earth-based S-burst event was reported prior to our study. A systematic study was performed on particle and field observations from the FAST spacecraft to search for events of S-bursts and Alfvén waves. Eight events involving coexistence …

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Synthesis And Characterization Of Platinum – Selenium Derivatives: X-Ray Structure Of Trans-Pt(Pet3)2(Seph)2, Martin D. Rudd, Sergey V. Lindeman May 2007

Synthesis And Characterization Of Platinum – Selenium Derivatives: X-Ray Structure Of Trans-Pt(Pet3)2(Seph)2, Martin D. Rudd, Sergey V. Lindeman

Chemistry Faculty Research and Publications

The crystal structure of trans-[((bis)triethylphosphine)(bis(phenylselenato))platinum (II)] has been determined by single crystal X-ray diffraction. Crystallization occurs in the triclinic space group P-1 (No. 2) with a = 8.9964(2) Å, b = 11.5103(2) Å, c = 14.9335(3) Å; α = 85.8750(10)°, β = 72.5350(10)°, γ = 68.4450(10)°. Details of the structure and spectroscopic results are presented and discussed and comparisons are made with related square planar platinum (II) structures.

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Enhancing The Performance Of Semi-Supervised Classification Algorithms With Bridging, Jason Yuk Hin Chan, Josiah Poon, Irena Koprinska May 2007

Enhancing The Performance Of Semi-Supervised Classification Algorithms With Bridging, Jason Yuk Hin Chan, Josiah Poon, Irena Koprinska

Research Collection School Of Computing and Information Systems

Traditional supervised classification algorithms require a large number of labelled examples to perform accurately. Semi-supervised classification algorithms attempt to overcome this major limitation by also using unlabelled examples. Unlabelled examples have also been used to improve nearest neighbour text classification in a method called bridging. In this paper, we propose the use of bridging in a semi-supervised setting. We introduce a new bridging algorithm that can be used as a base classifier in any supervised approach such as co-training or selflearning. We empirically show that classification performance increases by improving the semi-supervised algorithm’s ability to correctly assign labels to previouslyunlabelled …

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Analysis Of Topological Characteristics Of Huge Online Social Networking Services, Yong-Yeol Ahn, Seungyeop Han, Haewoon Kwak, Sue Moon, Hawoong Jeong May 2007

Analysis Of Topological Characteristics Of Huge Online Social Networking Services, Yong-Yeol Ahn, Seungyeop Han, Haewoon Kwak, Sue Moon, Hawoong Jeong

Research Collection School Of Computing and Information Systems

Social networking services are a fast-growing business in the Internet. However, it is unknown if online relationships and their growth patterns are the same as in real-life social networks. In this paper, we compare the structures of three online social networking services: Cyworld, MySpace, and orkut, each with more than 10 million users, respectively. We have access to complete data of Cyworld's ilchon (friend) relationships and analyze its degree distribution, clustering property, degree correlation, and evolution over time. We also use Cyworld data to evaluate the validity of snowball sampling method, which we use to crawl and obtain partial network …

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Deckard: Scalable And Accurate Tree-Based Detection Of Code Clones, Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Stephane Glondu May 2007

Deckard: Scalable And Accurate Tree-Based Detection Of Code Clones, Lingxiao Jiang, Ghassan Misherghi, Zhendong Su, Stephane Glondu

Research Collection School Of Computing and Information Systems

Detecting code clones has many software engineering applications. Existing approaches either do not scale to large code bases or are not robust against minor code modifications. In this paper, we present an efficient algorithm for identifying similar subtrees and apply it to tree representations of source code. Our algorithm is based on a novel characterization of subtrees with numerical vectors in the Euclidean Rn and an efficient algorithm to cluster these vectors w.r.t. the Euclidean distance metric. Subtrees with vectors in one cluster are considered similar. We have implemented our tree similarity algorithm as a clone detection tool called DECKARD …

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Experimental Evidence For A Metallohydrolase Mechanism In Which The Nucleophile Is Not Delivered By A Metal Ion: Epr Spectrokinetic And Structural Studies Of Aminopeptidase From Vibrio Proteolyticus, Amit Kumar, Gopal R. Periyannan, Aaron W. Kittell, Jung Ja Kim, Brian Bennett May 2007

Experimental Evidence For A Metallohydrolase Mechanism In Which The Nucleophile Is Not Delivered By A Metal Ion: Epr Spectrokinetic And Structural Studies Of Aminopeptidase From Vibrio Proteolyticus, Amit Kumar, Gopal R. Periyannan, Aaron W. Kittell, Jung Ja Kim, Brian Bennett

Physics Faculty Research and Publications

Metallohydrolases catalyse some of the most important reactions in biology and are targets for numerous chemotherapeutic agents designed to combat bacterial infectivity, antibiotic resistance, HIV infectivity, tumour growth, angiogenesis and immune disorders. Rational design of inhibitors of these enzymes with chemotherapeutic potential relies on detailed knowledge of the catalytic mechanism. The roles of the catalytic transition ions in these enzymes have long been assumed to include the activation and delivery of a nucleophilic hydroxy moiety. In the present study, catalytic intermediates in the hydrolysis of L-leucyl-L-leucyl-L-leucine by Vibrio proteolyticus aminopeptidase were characterized in spectrokinetic and structural studies. Rapid-freeze-quench EPR studies …

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The Effects Of Large Data Gaps On Estimating Linear Trend In Autocorrelated Data, Troy A. Wynn, Vincent B. Wickwar May 2007

The Effects Of Large Data Gaps On Estimating Linear Trend In Autocorrelated Data, Troy A. Wynn, Vincent B. Wickwar

Conference publications

It is well known that atmospheric data is autocorrelated. Techniques for fitting a model to autocorrelated data without data gaps are well known. However in cases where large data gaps exist the analysis ins more challenging. By large data gaps we mean 16-24% of the possible data present. This paper explores the challenges of estimating the correlation coefficient in an autocorrelated data set containing large data gaps and suggests ways to accurately estimate the autocorrelation and linear trend in a signal when such cases arise.

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Synthesis Of Hydroxycyclopentenones Via Titanium Complexes, Joeseph David Frasca May 2007

Synthesis Of Hydroxycyclopentenones Via Titanium Complexes, Joeseph David Frasca

Undergraduate Honors Thesis Collection

The electronegativity difference in the titanium-carbon bond has provided a synthetic framework in the formation of a wide range of organic products. Hydroxycyclopentenones are examples of such products and can be synthesized through a titanacyclobutene intermediate via a one-pot procedure. The process involves the incorporation of carbon monoxide into the titanacyclobutene ring with a concomitant addition of an alkyl halide in the presence of samarium diiodide. The synthetic utility of this reaction was explored by varying the alkyl halide. The results of such explorations show a variable tolerance for particular alkyl groups. The details of this project will be discussed.

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The Microbial Community Structure In Petroleum-Contaminated Sediments Corresponds To Geophysical Signatures, Jonathan P. Allen, Estella A. Atekwana, Eliot A. Atekwana, Joseph W. Duris, D. Dale Werkema, Silvia Rossbach May 2007

The Microbial Community Structure In Petroleum-Contaminated Sediments Corresponds To Geophysical Signatures, Jonathan P. Allen, Estella A. Atekwana, Eliot A. Atekwana, Joseph W. Duris, D. Dale Werkema, Silvia Rossbach

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The interdependence between geoelectrical signatures at underground petroleum plumes and the structures of subsurface microbial communities was investigated. For sediments contaminated with light non-aqueous-phase liquids, anomalous high conductivity values have been observed. Vertical changes in the geoelectrical properties of the sediments were concomitant with significant changes in the microbial community structures as determined by the construction and evaluation of 16S rRNA gene libraries. DNA sequencing of clones from four 16S rRNA gene libraries from different depths of a contaminated field site and two libraries from an uncontaminated background site revealed spatial heterogeneity in the microbial community structures. Correspondence analysis showed …

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Network Performance Monitor And Electronic Mail/Smtp Gateway For The Regis Academic Research Network, Steven F. Martin May 2007

Network Performance Monitor And Electronic Mail/Smtp Gateway For The Regis Academic Research Network, Steven F. Martin

Regis University Student Publications (comprehensive collection)

The Academic Research Network (ARN) is in need of a means of monitoring servers and other nodes on the network. That need is driven by the requirement to remotely monitor and support the sprawling network resources between campuses, provide real-time network status reports, and immediate reports of downed nodes. An additional need is electronic mail (e-mail) to serve the practicum students and administrators, but primarily to provide a mail gateway through which Internet mail can be transported in order to provide the aforementioned alerts.

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Global Profiles Of Compressional Ultralow Frequency Wave Power At Geosynchronous Orbit And Their Response To The Solar Wind, Jeff Sanny, D. Judnick, M. B. Moldwin, David Berube, D. G. Sibeck May 2007

Global Profiles Of Compressional Ultralow Frequency Wave Power At Geosynchronous Orbit And Their Response To The Solar Wind, Jeff Sanny, D. Judnick, M. B. Moldwin, David Berube, D. G. Sibeck

Physics Faculty Works

We investigate the global local-time profiles of compressional wave power in three ultralow frequency (ULF) bands corresponding to Pc3, Pc4, and Pc5 pulsations using magnetic field data from the geosynchronous GOES satellites. The global power profiles of the three frequency bands are studied for low, moderate, and high levels of geomagnetic activity based on the Dst index. We also consider the seasonal variation of the ULF power profiles, as well as the effects of solar wind and interplanetary magnetic field (IMF) parameters. For high geomagnetic activity, we find that the greatest power is associated with compressional Pc5 pulsations in the …

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Interpreting Force Concept Inventory Scores: Normalized Gain And Sat Scores, Vincent P. Coletta, Jeffrey A. Phillips, Jeffrey J. Steinert May 2007

Interpreting Force Concept Inventory Scores: Normalized Gain And Sat Scores, Vincent P. Coletta, Jeffrey A. Phillips, Jeffrey J. Steinert

Physics Faculty Works

Preinstruction SAT scores and normalized gains (G) on the force concept inventory (FCI) were examined for individual students in interactive engagement (IE) courses in introductory mechanics at one high school (N=335) and one university (N=292), and strong, positive correlations were found for both populations (r=0.57 and r=0.46, respectively). These correlations are likely due to the importance of cognitive skills and abstract reasoning in learning physics. The larger correlation coefficient for the high school population may be a result of the much shorter time interval between taking the SAT and studying mechanics, …

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Fractal Holography: A Geometric Re-Interpretation Of Cosmological Large Scale Structure, Jonas R. Mureika May 2007

Fractal Holography: A Geometric Re-Interpretation Of Cosmological Large Scale Structure, Jonas R. Mureika

Physics Faculty Works

The fractal dimension of large-scale galaxy clustering has been demonstrated to be roughly DF∼2 from a wide range of redshift surveys. If correct, this statistic is of interest for two main reasons: fractal scaling is an implicit representation of information content, and also the value itself is a geometric signature of area. It is proposed that the fractal distribution of galaxies may thus be interpreted as a signature of holography (``fractal holography''), providing more support for current theories of holographic cosmologies. Implications for entropy bounds are addressed. In particular, because of spatial scale invariance in the matter distribution, …

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The Open Archives Initiative, Michael L. Nelson May 2007

The Open Archives Initiative, Michael L. Nelson

Computer Science Presentations

PDF of a powerpoint presentation from the Open Archives Initiative DRIADE ( Digital Repository of Information and Data for Evolution) Workshop, Durham, North Carolina, May 16-17, 2007. Also available on Slideshare.

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Efficient Multi-View Video Coding Scheme Based On Dynamic Video Object Segmentation, Xiaohui Wei May 2007

Efficient Multi-View Video Coding Scheme Based On Dynamic Video Object Segmentation, Xiaohui Wei

Computer Science and Engineering Dissertations

Multi-view video, which simultaneously acquires multiple video sequences from multiple viewpoints or view directions, is poised to become the next generation video technology. Exploiting redundancy is the hallmark of traditional video coding but is even more essential in multi-view video coding (MVC) where the data size is extremely large. The exploitation of additional redundancies, however, incurs extra computational overhead, thereby counteracting the benefits gained from coding efficiency. This dissertation proposes an efficient MVC scheme that provides a complete encoding solution with low complexity. This includes exploitation of inter- and intra-view redundancies for achieving high coding efficiency, and exploitation of inter-view …

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Model-Independent Measurement Of The Excited Fraction In A Magneto-Optical Trap, M. H. Shah, H. A. Camp, M. L. Trachy, G. Veshapidze, M.A. Gearba, B.D. Depaola May 2007

Model-Independent Measurement Of The Excited Fraction In A Magneto-Optical Trap, M. H. Shah, H. A. Camp, M. L. Trachy, G. Veshapidze, M.A. Gearba, B.D. Depaola

Faculty Publications

In many experiments involving a magneto-optical trap (MOT) it is of great importance to know the fraction of atoms placed in an excited state due to the trapping process. Generally speaking, researchers have had to use overly simplistic and untested models to estimate this fraction. In this work, the excited fractions of 87Rb atoms in a MOT are directly measured using a charge transfer technique, for a range of MOT parameters. Simple models are then fit to the measured fractions. Using the results of this work, the excited fraction of 87Rb atoms trapped in a MOT can be …

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Products Of Characters With Few Irreducible Constituents, Edith Adan-Bante May 2007

Products Of Characters With Few Irreducible Constituents, Edith Adan-Bante

Faculty Publications

We study the solvable groups G that have an irreducible character χ ∈ Irr(G) such that χ--χ has at most two nonprincipal irreducible constituents.

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Experiment Planning For Protein Structure Elucidation And Site-Directed Protein Recombination, Xiaoduan Ye May 2007

Experiment Planning For Protein Structure Elucidation And Site-Directed Protein Recombination, Xiaoduan Ye

Dartmouth College Ph.D Dissertations

In order to most effectively investigate protein structure and improve protein function, it is necessary to carefully plan appropriate experiments. The combinatorial number of possible experiment plans demands effective criteria and efficient algorithms to choose the one that is in some sense optimal. This thesis addresses experiment planning challenges in two significant applications. The first part of this thesis develops an integrated computational-experimental approach for rapid discrimination of predicted protein structure models by quantifying their consistency with relatively cheap and easy experiments (cross-linking and site-directed mutagenesis followed by stability measurement). In order to obtain the most information from noisy and …

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Flash Crowd Mitigation System, Dongchul Kim May 2007

Flash Crowd Mitigation System, Dongchul Kim

Computer Science and Engineering Theses

Flash crowd means that a web server suffers a sudden surge of traffic since a large number of Internet users access the web server simultaneously. Once a flash crowd occurs in a web server, the response rate for the HTTP requests decreases rapidly, or the web server may even crash. To protect the web server from such flash crowds, in this paper, we propose the Flash Crowd Mitigation System (FCMS) which is based on the cooperation of the web servers and the redirection of the HTTP request. In FCMS, when a flash crowd is predicted by the traffic monitoring module …

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Heros: A Patient-Centered Goal-Directed Electronic Medical Record System For The Homeless, Kallol Silas Mahata May 2007

Heros: A Patient-Centered Goal-Directed Electronic Medical Record System For The Homeless, Kallol Silas Mahata

Computer Science and Engineering Theses

Homelessness is a growing problem in the United States. Numerous barriers keep the street homeless from obtaining healthcare. Medical Street Outreach (MSO) programs are designed to reach out to the homeless. Gathering relevant clinical information on the streets is difficult, and carrying paper records in MSO is cumbersome and inefficient. Several complex healthcare record systems have been developed for hospitals, but no such system exists for collecting health data on the streets. In this thesis, we describe a light weight Electronic Medical Record (EMR), called HEROS (Homeless Electronic RecOrd System) that we have built to address the process of healthcare …

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Medical Decision Support System Using Augmentable Guideline Engine, Adetayo Afolabi Aiyedun May 2007

Medical Decision Support System Using Augmentable Guideline Engine, Adetayo Afolabi Aiyedun

Computer Science and Engineering Theses

Increasing life expectancy accompanied by existing growth of wireless infrastructure and ubiquitous computing technologies has given healthcare providers access to vital information within their healthcare networks. Medical decision support systems (MDSS) play an increasingly important role in medical practice by assisting physicians with making clinical decisions. MDSS are interactive computer programs, which are designed to assist physicians and other health professionals with decision making. Currently, the strategies for providing MDSS has failed, in part, because they have not provided a secure, timely access to information that is current, ability to modify their knowledge base without hard coding them in their …

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Efficient Visualization Of Streaming Sensor Network Data Using Approximation Technique, Sunil Pai May 2007

Efficient Visualization Of Streaming Sensor Network Data Using Approximation Technique, Sunil Pai

Computer Science and Engineering Theses

By commanding a large number of wireless sensor nodes capable of sensing, communicating, and computing, wireless sensor networks have revealed their vast potential in a plethora of applications. However, due to the stringent resources limitations on each sensor node ranging from energy and computation to network bandwidth and storage, efficient and light weight systems must be designed in order to accommodate the resource limited environment. Furthermore, due to the potentially large number of sensor nodes deployed, the amount of sensory data gathered therein can be overwhelming for processing and visualizing in a resource limited central controller, such as mobile devices. …

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Hiearchical Overlay For Service Composition In Pervasive Environments, Aparna Kailas May 2007

Hiearchical Overlay For Service Composition In Pervasive Environments, Aparna Kailas

Computer Science and Engineering Theses

The objective of pervasive computing is to allow users to perform their tasks in a transparent way regardless of device features. Resources on devices should be exploited to provide services in order to perform user tasks. When there is no exact match for the user task in the environment, the capabilities of available devices should be combined to perform the user task. Seamless Service Composition (SeSCo) abstracts device capabilities as services and leverages existing work on graph algorithms to perform service composition. A lightweight framework, PerSON (Service Overlay Network for Pervasive Environments) was developed to provide a service overlay network …

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A Dynamic Framework For Testing The Synchronization Behavior Of Java Monitors, Andres Yanes May 2007

A Dynamic Framework For Testing The Synchronization Behavior Of Java Monitors, Andres Yanes

Computer Science and Engineering Theses

A Java monitor is a specialized class that is used to synchronize the behavior of threads in a Java program. The monitors in a Java program must be adequately tested to ensure the correctness of the program. In this thesis we propose a dynamic framework in which a Java monitor is tested by exploring its state space in a depth-first manner. The state exploration procedure consists of dynamically creating method sequences to exercise the possible synchronization behavior of the monitor. During exploration, new threads will be created on the fly to simulate different scenarios that result from threads reaching the …

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Sees - An Adaptive Multimodal User Interface For The Visually Impaired, Aparajit Saigal May 2007

Sees - An Adaptive Multimodal User Interface For The Visually Impaired, Aparajit Saigal

Computer Science and Engineering Theses

The enormous amount of electronic data present today can be a daunting task to access and process for a regular person, let alone someone with a disability. The World Wide Web and Electronic Mail have transformed the way we live. We are constantly become more dependent on this information, communication and commerce medium. The Speech Enabled Email System (SEES) is an alternate user interface that allows for the retrieval of emails and RSS feeds using speech. SEES can be accessed via a desktop application or through a telephony interface such as a regular phone-line or Voice over IP. This thesis …

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First Direct Measurement Of The Energy Spectra Of Individual Auger Cascade Steps In Solid Mno, Ag And Pd, Rajalakshmi Sundaramoorthy May 2007

First Direct Measurement Of The Energy Spectra Of Individual Auger Cascade Steps In Solid Mno, Ag And Pd, Rajalakshmi Sundaramoorthy

Physics Dissertations

We present the first direct measurements of energy spectra of electrons emitted in the later steps of the Auger cascade processes in solids. Measurements were carried out for the L-->MV-->VVV and L-->MM-->MVV-->VVVV Auger cascades in MnO and L-->MM-->MVV, M-->NV-->VVV Auger cascades in Ag and M-->NV-->VVV Auger cascade for Pd. The spectra associated with the later steps in the cascade were separated from overlapping spectral contribution from other decay processes by acquiring the cascade induced spectra in time coincidence with Auger electrons emitted in the prior cascade step. The Auger …

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Myriophyllum Heterophyllum Michx. (Haloragaceae): Control And Vegetative Reproduction In Southwestern Maine, Jacolyn E. Bailey May 2007

Myriophyllum Heterophyllum Michx. (Haloragaceae): Control And Vegetative Reproduction In Southwestern Maine, Jacolyn E. Bailey

Electronic Theses and Dissertations

Native to the southeastern United States, variable-leaf watermilfoil (Myriophyllum heterophyllum) is an invasive species in the Northeast and has been documented in Maine lakes for twenty years. Variable-leaf watermilfoil is targeted by the Maine Department of Environmental Protection as a species of grave concern as it has aggressively colonized twenty-six water bodies in Maine. This aquatic invasive plant grows in dense mats and outcompetes native vegetation. It is causing both ecological and economic disruption to Maine's lakes and ponds. The plants clog boat motors and deter people from swimming and other water related activities. Allofragmentation and autofragmentation occur …

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Sequence Stratigraphy Of The Middle Cambrian Marjum Formation: Response Of Sedimentary Facies And Biota To Sea-Level Changes, Douglas D. Smith May 2007

Sequence Stratigraphy Of The Middle Cambrian Marjum Formation: Response Of Sedimentary Facies And Biota To Sea-Level Changes, Douglas D. Smith

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research on the Marjum Formation provides insight into facies transitions in the House Range embayment of southwestern Utah during the Middle Cambrian. Sections of the Marjum Formation and equivalents were measured in strata representing shallow- (Drum Mountains), intermediate- (Wheeler Amphitheater), and deep-ramp (Marjum Pass) environments. This traverse across the embayment reveals strong litho- and biofacies changes. The Drum Mountains strata (343 m thick) are dominated by thick-bedded shallow-water limestone facies containing polymerid trilobites and stromatolites. The Wheeler Amphitheater locality (392 m thick) provides an example of intermediate deposits between deep-water and shallow-water environments and is characterized by limestone and subordinate …

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Rayleigh-Scatter Lidar Observations At Usu's Atmospheric Lidar Observatory (Logan,Ut) - Temperature Climatology, Temperature Comparisons With Msis, And Noctilucent Clouds, Joshua P. Herron May 2007

Rayleigh-Scatter Lidar Observations At Usu's Atmospheric Lidar Observatory (Logan,Ut) - Temperature Climatology, Temperature Comparisons With Msis, And Noctilucent Clouds, Joshua P. Herron

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Earth's atmosphere is typically characterized by its temperature structure, which naturally divides the atmosphere into several discrete regions. They are in order of increasing altitude the troposphere, stratosphere, mesosphere, and thermosphere. The first layer and a large portion of the second layer of the Earth's atmosphere are routinely measured via weather balloons that are launched twice daily around the globe. Satellites and their development have motivated the study of the thermosphere. It is the middle region of the Earth atmosphere, which is mainly composed of the mesosphere that lacks routine in situ measurements. Routine observations are therefore carried out …

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The Marriage Of Eolian Rock Properties And Deformation Of The Nugget Formation; Anschutz Ranch East Field: Northeast Utah And Southwest Wyoming, Dustin J. Keele May 2007

The Marriage Of Eolian Rock Properties And Deformation Of The Nugget Formation; Anschutz Ranch East Field: Northeast Utah And Southwest Wyoming, Dustin J. Keele

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Nugget Formation in the Anschutz Ranch East field, northeast Utah and southwest Wyoming, provides an exceptional example of how primary eolian rock properties have a considerable influence on the style of structural deformation. Both new and existing subsurface data were integrated for an overall characterization of sedimentologic and diagenetic heterogeneities, which demonstrate relationships with different styles of structural compartmentalization in reservoirs. The Anschutz Ranch East field is a large asymmetric anticlinal trap in the Utah-Wyoming thrust belt. Three cores were analyzed in order to investigate brittle deformation in eolian facies: dune, apron, and interdune. Selected cores are located along …

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