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2013

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Articles 121 - 150 of 8928

Full-Text Articles in Physical Sciences and Mathematics

Simulating Bipartite Networks To Reflect Uncertainty In Local Network Properties, Ravi Goyal, Joseph Blitzstein, Victor De Gruttola Dec 2013

Simulating Bipartite Networks To Reflect Uncertainty In Local Network Properties, Ravi Goyal, Joseph Blitzstein, Victor De Gruttola

Harvard University Biostatistics Working Paper Series

No abstract provided.


Development And Validation Of An Automated Directivity Acquisition System Used In The Acquisition, Processing, And Presentation Of The Acoustic Far-Field Directivity Of Musical Instruments In An Anechoic Space, Nicholas J. Eyring Dec 2013

Development And Validation Of An Automated Directivity Acquisition System Used In The Acquisition, Processing, And Presentation Of The Acoustic Far-Field Directivity Of Musical Instruments In An Anechoic Space, Nicholas J. Eyring

Theses and Dissertations

A high spatial resolution acoustic directivity acquisition system (ADAS) has been developed to acquire anechoic measurements of the far field radiation of musical instruments that are either remote controlled or played by musicians. Building upon work performed by the BYU Acoustic Research Group in the characterization of loudspeaker directivity, one can rotate a musical instrument with sequential azimuthal angle increments under a fixed semicircular array of microphones while recording repeated notes or sequences of notes. This results in highly detailed and instructive directivity data presented in the form of high-resolution balloon plots. The directivity data and corresponding balloon plots may …


Synthesis, Characterization, And Application Of High Surface Area, Mesoporous, Stabilized Anatase Tio2 Catalyst Supports, Rebecca Elizabeth Olsen Dec 2013

Synthesis, Characterization, And Application Of High Surface Area, Mesoporous, Stabilized Anatase Tio2 Catalyst Supports, Rebecca Elizabeth Olsen

Theses and Dissertations

Nanomaterials have attracted substantial attention in the area of catalysis due to the unique properties they exhibit such as high surface areas, intricate pore networks and unique morphologies. TiO2 has attracted attention as a catalyst since the discovery of its high photocatalytic activity by Fuishima and Honda in 1972. Given its high thermal stability, low cost, low environmental impact, and versatility, TiO2 is a widely used commercial catalyst and catalyst support. TiO2 is used in many applications such as photocatalysis is also an excellent support material for noble metals in a number of oxidative synthesis and pollution-control reactions. Though TiO2 …


Soil Development And Vegetation Response To Removal Of A Small Dam, Lassen Volcanic National Park, California, Stephanie Kay Rohdy Dec 2013

Soil Development And Vegetation Response To Removal Of A Small Dam, Lassen Volcanic National Park, California, Stephanie Kay Rohdy

Dissertations and Theses

Dam removal is increasing as dams age, yet little is understood about the pedogenic response to dam removal. This study reports on the edaphic changes of reservoir sediments and vegetation cover one year following removal of a small earthen dam in Northern California. In August 2012, I sampled surface sediments from the former Dream Lake reservoir in Lassen Volcanic National Park, and compared their physical and chemical properties with soil samples from two reference sites. I also estimated percent cover of vegetation in the former reservoir and reference sites. My results show that the reservoir was under reduced conditions, as …


Variational Methods And Critical Point Theory 2013, Victoria Otero-Espinar, Juan J. Nieto, Donal O'Regan, Kanishka Perera Dec 2013

Variational Methods And Critical Point Theory 2013, Victoria Otero-Espinar, Juan J. Nieto, Donal O'Regan, Kanishka Perera

Mathematics and System Engineering Faculty Publications

[No abstract provided]


Geology Of The Birdseye 7.5-Minute Quadrangle, Utah County, Utah:Â Implications For Mid-Cenozoic Extension And Deposition Of The Moroni Formation, Don L. Bagshaw Dec 2013

Geology Of The Birdseye 7.5-Minute Quadrangle, Utah County, Utah:Â Implications For Mid-Cenozoic Extension And Deposition Of The Moroni Formation, Don L. Bagshaw

Theses and Dissertations

Geologic structures within the Birdseye 7.5 minute quadrangle Utah County, Utah have been related by previous workers to both the Jurassic Arapien Shale diapirism and to the mid-Cenozoic extensional collapse of the Charleston-Nebo Thrust. Whichever model proves valid, it will have implications for oil exploration and interpretation of the subsurface geologic structure in the region. A detailed map of the quadrangle was constructed to better constrain which mechanism was responsible for the deformation. Exposures of Arapien Shale near, and within the Birdseye quadrangle show no evidence of diapiric movement. Arapien involvement in the deformation of Tertiary rocks in the center …


A Ten-Year Record Of Supraglacial Lake Evolution And Rapid Drainage In West Greenland Using An Automated Processing Algorithm For Multispectral Imagery, B. F. Morriss, R. L. Hawley, J. W. Chipman, L. C. Andrews Dec 2013

A Ten-Year Record Of Supraglacial Lake Evolution And Rapid Drainage In West Greenland Using An Automated Processing Algorithm For Multispectral Imagery, B. F. Morriss, R. L. Hawley, J. W. Chipman, L. C. Andrews

Dartmouth Scholarship

The rapid drainage of supraglacial lakes introduces large pulses of meltwater to the subglacial environment and creates moulins, surface-to-bed conduits for future melt. Introduction of water to the subglacial system has been shown to affect ice flow, and modeling suggests that variability in water supply and delivery to the subsurface play an important role in the development of the subglacial hydrologic system and its ability to enhance or mitigate ice flow. We developed a fully automated method for tracking meltwater and rapid drainages in large (> 0.125 km2) perennial lakes and applied it to a 10 yr time …


Interferometric Swath Processing Of Cryosat Data For Glacial Ice Topography, L. Gray, D. Burgess, L. Copland, R. Cullen, N. Galin, R. Hawley, V. Helm Dec 2013

Interferometric Swath Processing Of Cryosat Data For Glacial Ice Topography, L. Gray, D. Burgess, L. Copland, R. Cullen, N. Galin, R. Hawley, V. Helm

Dartmouth Scholarship

We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using "swath processing" of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic aperture radar interferometry) level 2 (L2) data product, the interferometric mode is used to map the cross-track position and elevation of the "point-of-closest-approach" (POCA) in sloping glacial terrain. However, in this work we explore the extent to which the phase of the returns in the intermediate L1b product can also be used to map the heights of …


Real Time Monitoring Of Surface Chemical Events By Streaming Potentials In Microfluidic Channels, Kenji Nokura Dec 2013

Real Time Monitoring Of Surface Chemical Events By Streaming Potentials In Microfluidic Channels, Kenji Nokura

Theses and Dissertations

Zeta potential is one of the tools to measure the surface charge of materials, and Alvarez et al. have developed a microchannel device to measure zeta potentials in real time for label-free sensing using immobilized receptors on microchannel surfaces. However, the challenge has been the charge interference of surface modifiers on analyte detection. Therefore, it was necessary to find the best strategy to regenerate minimal surface charge after modifying the channel with polymer films that would anchor the affinity groups for the analyte. It was demonstrated that adsorption of positively and negatively charged analytes were monitored via real time zeta …


Ice Crystal Formation And Evolution In Five Campaigns: Start08, Hippo Global, Dc3, Predict And Torero, Minghui Diao, Joshua Digangi, Anthony O’Brien, Mark Zondlo Dec 2013

Ice Crystal Formation And Evolution In Five Campaigns: Start08, Hippo Global, Dc3, Predict And Torero, Minghui Diao, Joshua Digangi, Anthony O’Brien, Mark Zondlo

Faculty Publications, Meteorology and Climate Science

In order to understand the microphysical properties of cirrus clouds, it is important to understand the formation and evolution of the environments where ice crystals form and reside on the microscale (~100 m). Uncertainties remain in simulating/parameterizing the evolution of ice crystals, which require more analyses in the Lagrangian view. However, most in situ observations are in the Eulerian view and are restricted from examining the lifecycle of cirrus clouds. In this work, a new method of Diao et al. GRL (2013)* is used to separate out five phases of ice crystal evolution, using the horizontal spatial relationships between ice …


Analyzing The Effect Of Client Queue Size On Voip And Tcp Traffic Over An Ieee 802.11e Wlan, Sajib Datta, Sajal Das Dec 2013

Analyzing The Effect Of Client Queue Size On Voip And Tcp Traffic Over An Ieee 802.11e Wlan, Sajib Datta, Sajal Das

Computer Science Faculty Research & Creative Works

In this paper we introduce a mathematical model to analyze the performance of Wi-Fi networks carrying voice calls and TCP controlled file downloads. We derive the voice call capacity, the TCP throughput, and the bandwidth utilization using the proposed five-dimensional Markov model. We show that there exists a correlation among the queue size of client nodes and the capacity and throughput of the network. We also demonstrate how bandwidth utilization is affected by variable packet arrival rates. The analytical results match well with the simulation results generated by QualNet simulator. Moreover, we conduct an experimental study of the Enhanced Distributed …


Sensitivity Curves For Searches For Gravitational-Wave Backgrounds, E. H. Thrane, Joseph D. Romano Dec 2013

Sensitivity Curves For Searches For Gravitational-Wave Backgrounds, E. H. Thrane, Joseph D. Romano

Physics & Astronomy Faculty Publications

We propose a graphical representation of detector sensitivity curves for stochastic gravitational-wave backgrounds that takes into account the increase in sensitivity that comes from integrating over frequency in addition to integrating over time. This method is valid for backgrounds that have a power-law spectrum in the analysis band. We call these graphs “power-law integrated curves.” For simplicity, we consider cross-correlation searches for unpolarized and isotropic stochastic backgrounds using two or more detectors. We apply our method to construct power-law integrated sensitivity curves for second-generation ground-based detectors such as Advanced LIGO, space-based detectors such as LISA and the Big Bang Observer, …


Robinson Point, Belize: An Important Foraging Ground For Endangered Sea Turtles In The Western Caribbean Sea, Linda Searle Dec 2013

Robinson Point, Belize: An Important Foraging Ground For Endangered Sea Turtles In The Western Caribbean Sea, Linda Searle

HCNSO Student Theses and Dissertations

Anecdotal reports, flipper tag returns, satellite migration paths, and above-water and net surveys have identified an important foraging area for sea turtles in the Robinson Point area, 12 kilometers southwest of Belize City. Visual observations confirmed that sea turtles were actively foraging at Robinson Point. Sixteen 30 minute visual observations from stationary and drifting boats made 132 sea turtle sightings from October 2007 through January 2008, with a maximum of 40 sightings made in one survey. In-water capture methodology tested the traditional turtle net, which captured 14 turtles in 63 sets for a success rate of only 22%. There were …


Nonlinear Spectroscopic Investigation Of Adsorption To C-18 Model Stationary Phase, Anthony D. Peterson Dec 2013

Nonlinear Spectroscopic Investigation Of Adsorption To C-18 Model Stationary Phase, Anthony D. Peterson

Theses and Dissertations

Reversed-phase liquid chromatography (RPLC) is a commonly used separation technique in chemistry. Nevertheless, the mechanistic interactions at the molecular level among the eluent, analyte, and the stationary phase are not fully understood. Because of this limited understanding, optimization of the separation must be done experimentally. Learning more about molecular interactions should aid in improving separations. We are currently using second-harmonic generation (SHG) spectroscopy to investigate how analytes adsorb to the surface. SHG is a spectroscopic technique that produces signal only at places of non-isotropic symmetry; this typically occurs at surfaces. SHG can be used to produce surface isotherms of test …


Record Linkage, Stasha Ann Bown Larsen Dec 2013

Record Linkage, Stasha Ann Bown Larsen

Theses and Dissertations

This document explains the use of different metrics involved with record linkage. There are two forms of record linkage: deterministic and probabilistic. We will focus on probabilistic record linkage used in merging and updating two databases. Record pairs will be compared using character-based and phonetic-based similarity metrics to determine at what level they match. Performance measures are then calculated and Receiver Operating Characteristic (ROC) curves are formed. Finally, an economic model is applied that returns the optimal tolerance level two databases should use to determine a record pair match in order to maximize profit.


Can Bohmian Mechanics Be Made Relativistic?, Detlef Dürr, Sheldon Goldstein, Travis Norsen, Ward Struyve, Nino Zaghì Dec 2013

Can Bohmian Mechanics Be Made Relativistic?, Detlef Dürr, Sheldon Goldstein, Travis Norsen, Ward Struyve, Nino Zaghì

Physics: Faculty Publications

In relativistic space-time, Bohmian theories can be formulated by introducing a privileged foliation of space-time. The introduction of such a foliation – as extra absolute space-time structure – would seem to imply a clear violation of Lorentz invariance, and thus a conflict with fundamental relativity. Here, we consider the possibility that, instead of positing it as extra structure, the required foliation could be covariantly determined by the wave function. We argue that this allows for the formulation of Bohmian theories that seem to qualify as fundamentally Lorentz invariant. We conclude with some discussion of whether or not they might also …


Optical Spectroscopic Studies Of Two Star Forming Regions, Kristen Leilani Erickson Dec 2013

Optical Spectroscopic Studies Of Two Star Forming Regions, Kristen Leilani Erickson

Dissertations

The ρ Ophiuchi and Serpens molecular clouds are sites of low mass star formation. The goals of this study were to identify young stellar objects (YSOs) and estimate ages and masses in order to infer an initial mass function (IMF), investigate disk evolution, and determine the star-forming history. Optical spectroscopic surveys of an unbiased sample of candidate young stars have been completed. Optical images taken in different photometric bands were used to create color-magnitude diagrams from which sources were selected for spectroscopic observation. In combination with published data, 135 association members in ρ Ophiuchi and 63 association members plus 16 …


U.S. Drought Monitor, December 10, 2013, Michael J. Brewer Dec 2013

U.S. Drought Monitor, December 10, 2013, Michael J. Brewer

United States Agricultural Commodities in Drought Archive

Drought map of U.S. for December 10, 2013 (12/10/13) plus: U.S. crop areas experiencing drought (map), Approximate percentage of crop located in drought, by state (bar graph), Percent of crop area located in drought, past 52 weeks (line graph) for: Corn, Soybeans, Hay, Cattle, Winter wheat.


Structure And Dynamics Of Self-Assembling Colloidal Monolayers In Oscillating Magnetic Fields, Alison E. Patteson (Koser), Nathan C. Keim, Paulo E. Arratia Dec 2013

Structure And Dynamics Of Self-Assembling Colloidal Monolayers In Oscillating Magnetic Fields, Alison E. Patteson (Koser), Nathan C. Keim, Paulo E. Arratia

Physics - All Scholarship

Many fascinating phenomena such as large-scale collective flows, enhanced fluid mixing, and pattern formation have been observed in so-called active fluids, which are composed of particles that can absorb energy and dissipate it into the fluid medium. For active particles immersed in liquids, fluid-mediated viscous stresses can play an important role on the emergence of collective behavior. Here, we experimentally investigate their role in the dynamics of self-assembling magnetically driven colloidal particles which can rapidly form organized hexagonal structures. We find that viscous stresses reduce hexagonal ordering, generate smaller clusters, and significantly decrease the rate of cluster formation, all while …


High Peaks Back - Country Trails Plan, Benjamin Godsoe Dec 2013

High Peaks Back - Country Trails Plan, Benjamin Godsoe

Muskie School Capstones and Dissertations

The High Peaks Trails Plan is a regional vision for back-country trails in Maine's High Peaks region. The plan identifies challenges and opportunities which face the trails community, and outlines several strategies for trails groups to move forward together to overcome mutual challenges.


Photoacoustic And Nephelometric Spectroscopy Of Aerosol Optical Properties With A Supercontinuum Light Source, Neha Sharma, I. J. Arnold, H. Moosmüller, W. P. Arnott, C. Mazzoleni Dec 2013

Photoacoustic And Nephelometric Spectroscopy Of Aerosol Optical Properties With A Supercontinuum Light Source, Neha Sharma, I. J. Arnold, H. Moosmüller, W. P. Arnott, C. Mazzoleni

Michigan Tech Publications, Part 1

A novel multi-wavelength photoacousticnephelometer spectrometer (SC-PNS) has been developed for the optical characterization of atmospheric aerosol particles. This instrument integrates a white light supercontinuum laser with photoacoustic and nephelometric spectroscopy to measure aerosol absorption and scattering coefficients at five wavelength bands (centered at 417, 475, 542, 607, and 675 nm). These wavelength bands are selected from the continuous spectrum of the laser (ranging from 400-2200 nm) using a set of optical interference filters. Absorption and scattering measurements on laboratory-generated aerosol samples were performed sequentially at each wavelength band. To test the instrument we measured the wavelength dependence of absorption and …


Synthesis, Characterization, And Functionalization Of Magnetic Iron Nanoparticles For Enhanced Biological Applications, Christopher Warren Dec 2013

Synthesis, Characterization, And Functionalization Of Magnetic Iron Nanoparticles For Enhanced Biological Applications, Christopher Warren

Theses and Dissertations

The transition metal ferrites of composition MFe2O4 where M is Fe, Co, or Ni are well established materials for various biological applications due to their interesting magnetic properties. Their elemental and stochiometric composition can be easily manipulated which allows further tuning of their ferrimagnetic properties. By changing the identity of M and by changing the crystallite size of the ferrites, nanocrystals with diverse magnetic properties can be systematically produced. Furthermore, ferrites are more stable in diverse chemical environments, as compared to metallic nanoparticles, which make ferrites particularly useful for a broad range of biomedical applications, especially in the field of …


Accelerating Computational Algorithms, Michael Risley Dec 2013

Accelerating Computational Algorithms, Michael Risley

Theses and Dissertations

Mathematicians and computational scientists are often limited in their ability to model complex phenomena by the time it takes to run simulations. This thesis will inform interested researchers on how the development of highly parallel computer graphics hardware and the compiler frameworks to exploit it are expanding the range of algorithms that can be explored on affordable commodity hardware. We will discuss the complexities that have prevented researchers from exploiting advanced hardware as well as the obstacles that remain for the non-computer scientist.


Pengaruh Dosis Pupuk N Dan P Terhadap Pertumbuhan Vegetatif Jarak Pagar Di Dua Tempat Berbeda, Santi Rosniawaty, Rija Sudirja Dec 2013

Pengaruh Dosis Pupuk N Dan P Terhadap Pertumbuhan Vegetatif Jarak Pagar Di Dua Tempat Berbeda, Santi Rosniawaty, Rija Sudirja

Jurnal Kultivasi

Physic nut is an alternative source of biofuel. The potential is high because it have many benefits and can not be consumed, so it will not compete with human needs. The effect of N and P fertilizer on physic nut (Jatropha curcas L.) has been studied from August 2010 until March 2011. The experiments were carried out in two different locations, in the field experiment of BPBHAT Jatinangor and farmer gardens in Plered. Soil types in Jatinangor and Plered was Inceptisol. Type of climate in Jatinangor was C while in Plered was D according to Schmidt-Ferguson (1951). Experimental design used …


Pertumbuhan Dan Hasil Tanaman Jagung (Zea Mays L.) Hibrida P-12 Yang Ditanam Pada Jarak Tanam Dan Dosis Pupuk Fosfor Yang Berbeda Pada Inseptisol Jatinangor, Agus Wahyudin, Ruminta, Nimas Nur Hafizhoh Dec 2013

Pertumbuhan Dan Hasil Tanaman Jagung (Zea Mays L.) Hibrida P-12 Yang Ditanam Pada Jarak Tanam Dan Dosis Pupuk Fosfor Yang Berbeda Pada Inseptisol Jatinangor, Agus Wahyudin, Ruminta, Nimas Nur Hafizhoh

Jurnal Kultivasi

This experiment was aims to determine the combination effect of plant spacing and phosphorus fertilizer on growth and yield of hybrid corns P-12. The experiment was conducted on March-July 2013 in inceptisol soil type in Agricultural Faculty Field Station, Padjadjaran University, Jatinangor, Sumedang, West Java. The experimental was use a Randomized Block Design with nine treatments and three replications, there is combination, plant space 75 cm x 25 cm and 200 kg/ha phosphorus fertilizer; plant space 75 cm x 25 cm and 300 kg/ha phosphorus fertilizer; plant space 75 cm x 25 cm and 400 kg/ha phosphorus fertilizer; plant space …


Fluorination Of Aromatic Ring Systems, Stephen G. Dimagno Dec 2013

Fluorination Of Aromatic Ring Systems, Stephen G. Dimagno

Department of Chemistry: Faculty Publications

This disclosure relates to reagents and methods useful in the synthesis of aryl fluorides, for example, in the preparation of 18F labeled radiotracers. The reagents and methods provided herein may be used to access a broad range of compounds, including aromatic compounds, heteroaromatic compounds, amino acids, nucleotides, and synthetic compounds.


Uncovering The Deeply Embedded Active Galactic Nucleus Activity In The Nuclear Regions Of The Interacting Galaxy Arp 299, A Alonso-Herrero, Eric S. Perlman Dec 2013

Uncovering The Deeply Embedded Active Galactic Nucleus Activity In The Nuclear Regions Of The Interacting Galaxy Arp 299, A Alonso-Herrero, Eric S. Perlman

Aerospace, Physics, and Space Science Faculty Publications

We present mid-infrared (MIR) 8-13 μm spectroscopy of the nuclear regions of the interacting galaxy Arp 299 (IC 694+NGC 3690) obtained with CanariCam (CC) on the 10.4 m Gran Telescopio Canarias (GTC). The high angular resolution (∼0.″3-0.″6) of the data allows us to probe nuclear physical scales between 60 and 120 pc, which is a factor of 10 improvement over previous MIR spectroscopic observations of this system. The GTC/CC spectroscopy displays evidence of deeply embedded active galactic nucleus (AGN) activity in both nuclei. The GTC/CC nuclear spectrum of NGC 3690/Arp 299-B1 can be explained as emission from AGN-heated dust in …


Capillary Channel Flow Experiments Aboard The International Space Station, Michael Conrath, P. J. Canfield, P. M. Bronowicki, Michael E. Dreyer, Mark M. Weislogel, A. Grah Dec 2013

Capillary Channel Flow Experiments Aboard The International Space Station, Michael Conrath, P. J. Canfield, P. M. Bronowicki, Michael E. Dreyer, Mark M. Weislogel, A. Grah

Mechanical and Materials Engineering Faculty Publications and Presentations

In the near-weightless environment of orbiting spacecraft capillary forces dominate interfacial flow phenomena over unearthly large length scales. In current experiments aboard the International Space Station, partially open channels are being investigated to determine critical flow rate-limiting conditions above which the free surface collapses ingesting bubbles. Without the natural passive phase separating qualities of buoyancy, such ingested bubbles can in turn wreak havoc on the fluid transport systems of spacecraft. The flow channels under investigation represent geometric families of conduits with applications to liquid propellant acquisition, thermal fluids circulation, and water processing for life support. Present and near future experiments …


Comparative Water Quality Of Cozine, Gooseneck And Mill Creeks, Shelby Hollenbeck, Emily Isaac, Suzannah Klaniecki, Zach Lea, Meghan Lockwood, Xavier Reed Dec 2013

Comparative Water Quality Of Cozine, Gooseneck And Mill Creeks, Shelby Hollenbeck, Emily Isaac, Suzannah Klaniecki, Zach Lea, Meghan Lockwood, Xavier Reed

Papers from ENVS 385 (Research Methods in Environmental Science)

The environmental research methods class of fall 2013 analyzed the water quality of three creeks in the Yamhill (Oregon) Watershed: Cozine, Gooseneck, and Mill Creeks. Our research builds on data collected by previous years' classes (Colahan et al. 2011; Weinbender and Crane 2011; Bailey et al. 2012). The goals of the project were to gain a better understanding of water quality at each site, see how the sites differ, determine causes for any differences, and examine changes in water quality over time. Because Cozine is surrounded by an urban environment, whereas both Gooseneck and Mill are in a rural setting, …


2013 Fall Engr333 Student Seminar Presentation, Claire Philippi, Karl Bratt, Mike Houtman, Brandon Koster Dec 2013

2013 Fall Engr333 Student Seminar Presentation, Claire Philippi, Karl Bratt, Mike Houtman, Brandon Koster

ENGR 333

File for student presentation, given by students in the Fall 2013 class of ENGR333.