Physical Sciences and Mathematics Commons^™

Geomagnetic Field Behavior Before And After The Kauai Reverse-Normal Polarity Transition, Scott Bogue

Scott Bogue

New paleomagnetic results from 4 m.y. old lava flows from Kauai, Hawaii, suggest that strong poloidal field is associated with an unusual state of the geodynamo that follows attempts at polarity reversal (successful or not). The new data comprise 50 paleomagnetic sites from superposed lava flows occurring just below and above the Kauai reverse-normal polarity transition. A composite record of 45 distinct field determinations was constructed by combining sites that record similar ancient field and correlating them to previously published results from Kauai. Of the 45 data, 25 include paleointensity estimates derived from double-heating experiments. A comparison of the composite …

Improved 3d Modeling Of Complex Fault Geometries Using Poly3d, An Elastic Boundary Element Code, Phillip Resor, D Pollard, F Maerten, L Maerten, J Muller, A Aydin

Phillip G Resor

Recent advances in geologic mapping, aftershock location, and reflection seismology allow geoscientists to image surface and subsurface structures with greater precision. These images demonstrate that earthquake ruptures typically occur along faults or fault systems that display complex 3D geometries. Poly3D, a 3D boundary element code and user interface, enables the integration of these varied data sets to constrain fault geometry and accurately models the complex geometries, limited only by data precision and computing power. Poly3D is based on the analytical solution for the elastic boundary value problem of an angular dislocation in a half space composed of a homogeneous and …

Transport And Magnetic Properties Of Co1-Xnixsb3 With X Less Than 0.01, Jeffrey Dyck, W. Chen, Y. Yang, G. Meisner, C. Uher

Jeffrey Dyck

The filled skutterudite compounds based on the binary skutterudite CoSb3 are currently being investigated for their potential application as thermoelectric materials. One route to optimization of these compounds is by doping on the Co site. An obvious candidate for an n-type dopant is Ni, because it has one more electron in its valence shell than Co. We present electrical resistivity, thermopower, Hall effect and magnetic susceptibility measurements on polycrystalline, n-type Co1-xNixSb3 with x less than 0.01. A model which takes into account conduction of electrons residing in the conduction band in addition to hopping conduction within an impurity "band" formed …

Letter To The Editor, Stan Wagon

Stan Wagon, Retired

No abstract provided.

From Rio To Johannesburg: Implementing Sustainable Development At The Global And Local Scale, John Dernbach

John C. Dernbach

No abstract provided.

Metal Binding Studies With Macrocyclic Hexathioethers: Transition Metal Complexes Of 22s6 And 20s6”,, Gregory Grant, Christopher Brandow, Chrystal Bruce, Mark Brandt, Rebecca Kirk, Sabrina Lee, Kerry Robinson, Larry Mehne

Chrystal D. Bruce

No abstract provided.

Comment On "The Van Der Waals Interaction," By Barry R. Holstein [Am. J. Phys. 69 (4), 441-449 (2001)], Br Holstein

Barry R Holstein

No abstract provided.

Mental Rotation Of Objects Retrieved From Memory: An Fmri Study Of Spatial Processing, Marcel Just, Patricia Carpenter, Mandy Maguire, Vaibhav Diwadkar, Stephanie Mcmains

Marcel Adam Just

No abstract provided.

Imaging Fault Structure Of The 1995 Kozani-Grevena Earthquake Sequence, Greece Using High Precision Aftershock Locations, Phillip Resor, G Beroza, David Pollard

Phillip G Resor

The May 13, 1995 Kozani-Grevena earthquake (Mw=6.5) is a natural laboratory for studying crustal normal fault systems. The event and its aftershocks have been well observed geodetically, seismically, and geologically, providing an opportunity to integrate data sets to create a detailed subsurface fault model and investigate triggering and deformation associated with a large normal fault earthquake. Previous modeling of the earthquake has focused primarily on single geodetic data sets (e.g. inSAR - Meyer et al, 1996, GPS - Clarke et al., 1997) and has led to conflicting subsurface fault interpretations. In order to better model the subsurface fault geometry we …

Metafam: A Unified Classification Of Protein Families I. Overview And Statistics, Elizabeth Shoop, K. Silverstein, Et Al

Elizabeth Shoop

No abstract provided.

Determination Of The Quadratic Slope Parameter In Eta -> 3 Pi(0) Decay, Wb Tippens, S Prakhov, Ce Allgower, V Bekrenev, E Berger, Wj Briscoe, M Clajus, Jr Comfort, K Craig, A Efendiev, D Grosnick, Br Holstein, Gm Huber, D Isenhower, N Knecht, D Koetke, A Koulbardis, N Kozlenko, S Kruglov, Gj Lolos, I Lopatin, Dm Manley, A Marusic, R Manweiler, S Mcdonald, Bmk Nefkens, J Olmsted, Z Papandreou, N Phaisangittisakul, Jw Price, M Pulver, Af Ramirez, Me Sadler, A Shafi, H Spinka, S Stanislaus, A Starostin, Hm Staudenmaier

Barry R Holstein

We have determined the quadratic slope parameter α for η→3π0 to be α = -0.031(4) from a 99% pure sample of 106η→3π0 decays produced in the reaction π-p→nη close to the η threshold using the Crystal Ball detector at the AGS. The result is four times more precise than the present world data and disagrees with current chiral perturbation theory calculations by about four standard deviations.

Biorthogonal Wavelets With Certain Regularities, Tian-Xiao He

Tian-Xiao He

No abstract provided.

The Metafam Server: A Comprehensive Protein Family Resource, Elizabeth Shoop, K. Silverstein, Et Al

Elizabeth Shoop

No abstract provided.

Interdependence Of Non-Overlapping Cortical Systems In Dual Cognitive Tasks, Marcel Adam Just, Patricia A. Carpenter, Timothy A. Keller, Lisa Emery, Holly Zajac, Keith R. Thulborn

Marcel Adam Just

No abstract provided.

Comment On "A Check Of Prigogine's Theorem Of Minimum Entropy Production In A Rod In A Nonequilibrium Stationary State", Peter Palffy-Muhoray

Peter Palffy-Muhoray

No abstract provided.

Oral History Interview With Edsger W. Dijkstra, Philip L. Frana

Philip L Frana

In this oral history Edsger Dijkstra recounts his early education and training as a theoretical physicist and as a'programmer'. Dijkstra describes his work developing software, and his activities at several early information processing conferences. Dijkstra also discourses on the development of ALGOL 60 and the origins of computing science in Europe and America.

A Binary Entropy Measure To Assess Nonrigid Registration Algorithms, Simon K. Warfield, Jan Rexilius, Petra S. Huppi, Terrie E. Inder, Erik G. Learned-Miller, William M. Wells Iii, Gary P. Zientara, Ferenc A. Jolesz, Ron Kikinis

Erik G Learned-Miller

Assessment of normal and abnormal anatomical variability requires a coordinate system enabling inter-subject comparison. We present a binary minimum entropy criterion to assess affine and nonrigid transformations bringing a group of subject scans into alignment. This measure is a data-driven measure allowing the identification of an intrinsic coordinate system of a particular group of subjects. We assessed two statistical atlases derived from magnetic resonance imaging of newborn infants with gestational age ranging from 24 to 40 weeks. Over this age range major structural changes occur in the human brain and existing atlases are inadequate to capture the resulting anatomical variability. …

Color Eigenflows : Statistical Modeling Of Joint Color Changes, Erik G. Learned-Miller, Kinh Tieu

Erik G Learned-Miller

We develop a linear model of commonly observed joint color changes in images due to variation in lighting and certain non-geometric camera parameters. This is done by observing how all of the colors are mapped between two images of the same scene under various “real-world” lighting changes. We represent each instance of such a joint color mapping as a 3-D vector field in RGB color space. We show that the variance in these maps is well represented by a low dimensional linear subspace of these vector fields. We dub the principal components of this space the color eigenflows. When applied …

An Intrinsic Coordinate System Of The Developing Human Brain, Simon K. Warfield, Petra S. Huppi, Terrie E. Inder, Erik G. Learned-Miller, William M. Wells Iii, Gary P. Zientara, Ferenc A. Jolesz, Ron Kikinis

Erik G Learned-Miller

No abstract provided.

Biorthogonal Wavelets With Certain Regularities, Tian-Xiao He

Tian-Xiao He

No abstract provided.

Lead Isotope Tracking Of Atmospheric Response To Post- Industrial Conditions In Yerevan, Armenia, Charles Dunlap, Robert Kurkjian

Charles Dunlap

Temporal gradients in environmental lead concentrations and isotopic compositions trace the rapidly shifting transition from high to low industrial emissions in Yerevan, Armenia following the dissolution of the Soviet Union in the early 1990s. Shortly after the breakup, in 1995 and 1996, atmospheric lead concentrations averaged ~0.4 µg/m3 and the combustion of leaded gasoline was the primary source of industrial lead emissions in Yerevan. But by 1998, unleaded gasoline was predominant and atmospheric lead concentrations had decreased by two orders of magnitude to ≤ 0.003 µg/m3 because industrial lead emissions from stationary sources had also been radically curtailed. The increased …

A Service Paradigm For Reconfigurable Agents, Gary Holness, Deepak Karuppiah, Subramanya Uppala, Roderic Grupen, S. Chandu Ravela

Roderic Grupen

Applications of multiple processors embedded in the systems involved with entertainment, informatics, climate control, communication, transportation, and food preparation are already commonplace. A network of these embedded processors presents application development challenges since the state space grows exponentially as new devices attach to the network. The programming model for such systems will need to change if reliable systems are to be realized. By observing information about sensorimotor activity, such systems can gather information useful to programming the network. Through such interaction, a network can build hierarchies of shareable computational structures for representing various activities. This application domain presents additional challenges …

Lighting Invariance Through Joint Color Change Models, Erik G. Learned-Miller, Kinh Tieu, Eric Grimson

Erik G Learned-Miller

In [9], we introduced a linear statistical model of joint color changes in images due to variation in lighting and certain non-geometric camera parameters. We did this by measuring the mappings of colors in one image of a scene to colors in another image of the same scene under different lighting conditions. In this paper, we extend our model in several ways and examine its applicability to several important problems in machine vision. The extensions to our model include incorporating a model of image noise and a prior on the color flows used to explain a particular image difference. In …

The Neural Bases Of Sentence Comprehension: A Fmri Examination Of Syntactic And Lexical Processing, Timothy A. Keller, Patricia A. Carpenter, Marcel Adam Just

Marcel Adam Just

No abstract provided.

An Fmri Investigation Of Sentence Comprehension By Eye And By Ear: Modality Fingerprints On Cognitive Processes, Erica B. Michael, Timothy A. Keller, Patricia A. Carpenter, Marcel Adam Just

Marcel Adam Just

No abstract provided.

The Discovery-Oriented Approach To Organic Chemistry. 5. Stereochemistry Of E2 Elimination: Elimination Of Cis- And Trans-2-Methylcyclohexyl Tosylate, Ram S. Mohan, Marcus E. Cabay, Brad J. Ettlie, Adam J. Tuite, Kurt A. Welday

Ram S. Mohan

Deprotection Of Ketoximes Using Bismuth(Iii) Nitrate Pentahydrate, Ram S. Mohan, Bryce A. Nattier, Kyle J. Eash

Ram S. Mohan

The Discovery-Oriented Approach To Organic Chemistry. 4. Epoxidation Of P-Methoxy-Trans-Β-Methylstyrene. An Exercise In 1H Nmr And 13C Nmr Spectroscopy For Sophomore Organic Laboratories, Ram S. Mohan, Rebecca S. Centko

Ram S. Mohan

A Facile And Efficient Method For The Rearrangement Of Aryl-Substituted Epoxides To Aldehydes And Ketones Using Bismuth Triflate, Ram S. Mohan, Kaushik A. Bhatia, Kyle J. Eash, Nicholas M. Leonard, Matthew C. Oswald

Ram S. Mohan

An Efficient Method For The Chemoselective Synthesis Of Acylals From Aromatic Aldehydes Using Bismuth Triflate, Ram S. Mohan, Marc D. Carrigan, Kyle J. Eash, Matthew C. Oswald

Ram S. Mohan