Physical Sciences and Mathematics Commons^™

On Multiscale Approaches To 3-Dimensional Modeling Of Morphogenesis, Rajiv Chaturvedi, Chengbang Huang, Bogdan Kazmierczak, T. Schneider, Jesus A. Izaguirre, Tilmann Glimm, H. George E. Hentschel, Stuart (Stuart A.) Newman, Mark Alber, James A. Glazier

Mathematics Faculty Publications

In this paper we present the foundation of a unified, object-oriented, three-dimensional (3D) biomodeling environment, which allows us to integrate multiple submodels at scales from subcellular to tissues and organs. Our current implementation combines a modified discrete model from statistical mechanics, the Cellular Potts Model (CPM), with a continuum reaction-diffusion (RD) model and a state automaton with well-defined conditions for cell differentiation transitions to model genetic regulation. This environment allows us to rapidly and compactly create computational models of a class of complex developmental phenomena. To illustrate model development, we simulate a simplified version of the formation of the skeletal …

Tandem Mass Spectrometry Of Deprotonated Iodothyronines, A. M. Couldwell, M. C. Thomas, Todd Mitchell, A. Hulbert, Stephen J. Blanksby

Faculty of Science - Papers (Archive)

In order to assist with the development of more selective and sensitive methods for thyroid hormone analysis the [M-H]– anions of the iodothyronines; T4, T3, rT3, (3,5)-T2 and the non-iodinated thyronine (T0) have been generated by negative ion electrospray mass spectrometry. Tandem mass spectra of these ions were recorded on a triple quadrupole mass spectrometer and show a strong analogy with the fragmentation pathways of the parent compound, tyrosine. All iodothyronines also show significant abundances of the iodide anion in their tandem mass spectra, which represents an attractive target for MRM analysis, given that iodothyronines are the only iodine bearing …

Practical Secure Information Flow In Programming Languages, Zhenyue Deng

FIU Electronic Theses and Dissertations

If we classify variables in a program into various security levels, then a secure information flow analysis aims to verify statically that information in a program can flow only in ways consistent with the specified security levels. One well-studied approach is to formulate the rules of the secure information flow analysis as a type system. A major trend of recent research focuses on how to accommodate various sophisticated modern language features. However, this approach often leads to overly complicated and restrictive type systems, . making them unfit for practical use. Also, problems essential to practical use, such as type inference …

A Partial Likelihood For Spatio-Temporal Point Processes, Peter J. Diggle

Johns Hopkins University, Dept. of Biostatistics Working Papers

Spatio-temporal point process data arise in many fields of application. An intuitively natural way to specify a model for a spatio-temporal point process is through its conditional intensity at location x and time t, given the history of the process up to time t. Typically, this results in an analytically intractable likelihood. Likelihood-based inference therefore relies on Monte Carlo methods which are computationally intensive and require careful tuning to each application. We propose a partial likelihood alternative which is computationally straightforward and can be applied routinely. We apply the method to data from the 2001 foot-and-mouth epidemic in the UK, …

Haloes Of K-Essence, Christian Armendariz-Picon, Eugene A. Lim

Physics - All Scholarship

We study gravitationally bound static and spherically symmetric configurations of k-essence fields. In particular, we investigate whether these configurations can reproduce the properties of dark matter haloes. The classes of Lagrangians we consider lead to non-isotropic fluids with barotropic and polytropic equations of state. The latter include microscopic realizations of the often-considered Chaplygin gases, which we find can cluster into dark matter halo-like objects with flat rotation curves, while exhibiting a dark energy-like negative pressure on cosmological scales. We complement our studies with a series of formal general results about the stability and initial value formulation of non-canonical scalar field …

Dynamo Regimes With A Nonhelical Forcing, Pablo D. Mininni, Yannick Ponty, David C. Montgomery, Jean-Francois Pinton

Dartmouth Scholarship

A three-dimensional numerical computation of magnetohydrodynamic dynamo behavior is described. The dynamo is mechanically forced with a driving term of the Taylor-Green type. The magnetic field development is followed from negligibly small levels to saturated values that occur at magnetic energies comparable to the kinetic energies. Although there is locally a nonzero helicity density, there is no overall integrated helicity in the system. Persistent oscillations are observed in the saturated state for not-too-large mechanical Reynolds numbers, oscillations in which the kinetic and magnetic energies vary out of phase but with no reversal of the magnetic field. The flow pattern exhibits …

Matrix Representations Of Automorphism Groups Of Free Groups, Ivan B. Andrus

Theses and Dissertations

In this thesis, we study the representation theory of the automorphism group Aut (Fn) of a free group by studying the representation theory of three finite subgroups: two symmetric groups, Sn and Sn+1, and a Coxeter group of type Bn, also known as a hyperoctahedral group. The representation theory of these subgroups is well understood in the language of Young Diagrams, and we apply this knowledge to better understand the representation theory of Aut (Fn). We also calculate irreducible representations of Aut (Fn) in low dimensions and for small n.

Slides: Funding For Acquisitions: Creative And Emerging Mechanisms To Tap Private Funds, Peter R. Stein

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Peter R. Stein, General Partner, The Lyme Timber Company, Hanover, NH

9 slides

Slides: Sustainable Forest Management Of Community Forest Lands: It's A Matter Of Balance, Dave Epperly

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Dave Epperly, St. Louis County Forest, MN

28 slides

Slides: Long Term Forest Management: Creating A Forest Management Plan, Don Johnson

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Don Johnson, Forest Land Improvement, Inc., NH town forests

51 slides

Slides: New England Forestry Foundation: Private Forests For The Public Good Since 1944, Frank Reed

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Frank Reed, New England Forestry Foundation

9 slides

Slides: Long Term Management Of Community Forests: Some Eomf Partner Perspectives, Brian Barkley

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Brian Barkley, Ontario Model Forest, Canada

18 slides

Slides: Forest Grove Municipal Watershed: Using Citizen Involvement To Break Gridlock, Scott Ferguson

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Scott Ferguson, City of Forest Grove, OR

23 slides

Slides: The Downhill Lever Of Current Forest Finance, Tom Tuchmann

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Tom Tuchmann, US Forest Capital, Portland, OR

6 slides

Slides: Forestry On The Yakama Reservation: The Balancing Of Natural Resources Management, Philip Rigdon

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Philip Rigdon, Yakama Nation, Toppenish, WA

64 slides

Late‐Time X‐Ray, Uv, And Optical Monitoring Of Supernova 1979c, Stefan Immler, Robert A. Fesen, Schuyler D. Van Dyk, Kurt W. Weiler, Robert Petre, Walter H.G Lewin, David Pooley, Wolfgang Pietsch, Bernd Aschenbach, Molly C. Hammell, Gwen C. Rudie

Dartmouth Scholarship

We present results from observations of supernova (SN) 1979C with the Newton X-Ray Multi-Mirror (XMM-Newton) mission in X-rays and in UV, archival X-ray, and Hubble Space Telescope (HST) data, and follow-up ground-based optical imaging. The XMM-Newton MOS spectrum shows the best-fit two-temperature thermal plasma emission characteristics of both the forward (kT_high = 4.1 keV) and reverse shock (kT_low = 0.79 keV) with no intrinsic absorption. The long-term X-ray light curve, constructed from all X-ray data available, reveals that SN 1979C is still radiating at a flux level similar to that detected by …

Elasticity, Fluctuations, And Vortex Pinning In Ferromagnetic Superconductors: A Columnar Elastic Glass, A. M. Ettouhami, Karl Saunders, Leo Radzihovsky, John Toner

Physics

We study the elasticity, fluctuations, and pinning of a putative spontaneous vortex solid in ferromagnetic superconductors. Using a rigorous thermodynamic argument, we show that in the idealized case of vanishing crystalline pinning anisotropy the long-wavelength tilt modulus of such a vortex solid vanishes identically, as guaranteed by the underlying rotational invariance. The vanishing of the tilt modulus means that, to lowest order, the associated tension elasticity is replaced by the softer, curvature elasticity. The effect of this is to make the spontaneous vortex solid qualitatively more susceptible to the disordering effects of thermal fluctuations and random pinning. We study these …

An Analysis Of The Chemical Processes In The Smoke Plume From A Savanna Fire, Jorg Trentmann, Robert J. Yokelson, Peter V. Hobbs, Tanja Winterrath, Ted J. Christian, Meinrat O. Andreae, Sherri A. Mason

Chemistry and Biochemistry Faculty Publications

[1] Photochemistry in young plumes from vegetation fires significantly transforms the initial fire emissions within the first hour after the emissions are injected into the atmosphere. Here we present an investigation of field measurements obtained in a smoke plume from a prescribed savanna fire during the SAFARI 2000 field experiment using a detailed photochemical box-dilution model. The dilution used in the model simulations was constrained by measurements of chemically passive tracers (e.g., CO) near and downwind of the fire. The emissions of the dominant carbonaceous compounds, including oxygenated ones, were taken into account. The field measurements revealed significant production of …

Managing Access Control In Virtual Private Networks, Twum Djin

Dartmouth College Undergraduate Theses

Virtual Private Network technology allows remote network users to benefit from resources on a private network as if their host machines actually resided on the network. However, each resource on a network may also have its own access control policies, which may be completely unrelated to network access. Thus users� access to a network (even by VPN technology) does not guarantee their access to the sought resources. With the introduction of more complicated access privileges, such as delegated access, it is conceivable for a scenario to arise where a user can access a network remotely (because of direct permissions from …

Community Forests: A Perspective, Robert Mccullough

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

22 pages.

"Robert McCullough teaches in the University of Vermont Graduate Program in Historic Preservation. He wrote The Landscape of Community: Communal Forests in New England."

Slides: City Of Arcata Community Forest, Mark André

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Mark André, Arcata, CA, Community Forest

42 slides

Slides: White Mountain Apache, Paul Declay, Jr.

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Paul DeClay, Jr., Tribal Forest Manager, White Mountain Apache, AZ

34 slides

Slides: Community Outreach, Tom Tuchmann

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Tom Tuchmann, US Forest Capital, Portland, OR

10 slides

Slides: Public Funding Sources In Mt: State Funding Sources, 3 Partnerships Examples, Alan Wood

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Alan Wood, MT Department of Fish, Wildlife and Parks, Helena, MT

12 slides

Slides: Community-Owned Forests: Funding For Acquisition, Missoula, Mt, Tom Cassidy

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Thomas Cassidy, The Nature Conservancy, VA

21 slides

Slides: Palmetto-Peartree Preserve: Community Forestry In Eastern North Carolina, Mikki Sager

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Mikki Sager, Palmetto-Peartree Preserve, NC

17 slides

Slides: Harrop-Procter Community Forest, Ramona Faust

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Ramona Faust, General Manager, Harrop-Procter Community Forest, Canada

41 slides

Slides: Changes In Timberland Ownership, Peter R. Stein

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Peter R. Stein, General Partner, The Lyme Timber Company, Hanover, NH

14 slides

Slides: Overview Of Funding Sources: Land And Water Conservation Fund Act (Lwcf) 1965 (Includes Forest Legacy And Other Cooperative Conservation Programs) And Federal Land Transaction Facilitation Act Of 2000 (Fltfa Aka The "Baca" Act), Dick Todd

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Dick Todd, Bureau of Land Management, OR

11 slides

Slides: Wisconsin County Forests, Neil Paulson

Community-Owned Forests: Possibilities, Experiences, and Lessons Learned (June 16-19)

Presenter: Neil Paulson, Bayfield County Forest, WI

25 slides