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Search Results: 1 - 10 of 117887 matches for " T. Strub "
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An overview of interactions among oceanography, marine ecosystems, climatic and human disruptions along the eastern margins of the Pacific Ocean
HALPIN,PATRICIA M.; STRUB,P. TED; PETERSON,WILLIAM T.; BAUMGARTNER,TIM R.;
Revista chilena de historia natural , 2004, DOI: 10.4067/S0716-078X2004000300002
Abstract: physical processes, biotic processes and human activities all act to shape marine ecosystems. future management of these valuable ecosystems requires an integrative approach that takes into account complicated organismal interactions, oceanographic processes that span large scales of time and space, and how anthropogenic effects interact with the natural environment. the temperate west coasts of north and south america represent a unique opportunity for comparison, as many of the same oceanographic processes, particularly upwelling, occur off both coasts. additionally, a number of marine ecosystems in both areas have surprising parallels. here we present an overview of the oceanographic processes that dominate the coastlines, and give examples of ecosystems and the effects that oceanography, human activities and their interaction have on the communities
An overview of interactions among oceanography, marine ecosystems, climatic and human disruptions along the eastern margins of the Pacific Ocean Una visión general de las interacciones entre la oceanografía, los ecosistemas marinos y las disrupciones climáticas y antrópicas en los márgenes este del Océano Pacífico
PATRICIA M. HALPIN,P. TED STRUB,WILLIAM T. PETERSON,TIM R. BAUMGARTNER
Revista chilena de historia natural , 2004,
Abstract: Physical processes, biotic processes and human activities all act to shape marine ecosystems. Future management of these valuable ecosystems requires an integrative approach that takes into account complicated organismal interactions, oceanographic processes that span large scales of time and space, and how anthropogenic effects interact with the natural environment. The temperate west coasts of North and South America represent a unique opportunity for comparison, as many of the same oceanographic processes, particularly upwelling, occur off both coasts. Additionally, a number of marine ecosystems in both areas have surprising parallels. Here we present an overview of the oceanographic processes that dominate the coastlines, and give examples of ecosystems and the effects that oceanography, human activities and their interaction have on the communities Los procesos físicos y biológicos y las actividades humanas determinan los ecosistemas marinos. El manejo futuro de estos valiosos ecosistemas requiere de una aproximación integrativa que considere las complejas interacciones entre individuos, los procesos oceanográficos que se desarrollan a gran escala espacial y temporal, y la interacción de los efectos antropogénicos con el medio ambiente. Las costas templadas del oeste de Norteamérica y Sudamérica representan una oportunidad única para efectuar comparaciones ya que muchos procesos oceanográficos, particularmente la surgencia costera, ocurren en ambas costas. Adicionalmente, numerosos ecosistemas marinos en ambas áreas presentan sorprendentes paralelos. La presente revisión ofrece una visión general de los procesos oceanográficos dominantes en ambas costas y ofrece ejemplos de ecosistemas y los efectos que la oceanografía, las actividades humanas y las interacciones entre individuos tienen sobre las comunidades marinas
ANTICYCLONIC EDDIES IN THE ALASKA GYRE (AND CAPE HORN CURRENT?)
Ted Strub,P.;
Gayana (Concepción) , 2004, DOI: 10.4067/S0717-65382004000300042
Abstract: sea surface height (ssh) fields, constructed from multiple altimeters, have revealed the annual generation of anticyclonic eddies around the alaska gyre. these eddies appear to develop annually along the eastern margin of the gyre from instabilities in the poleward alaska current, after it reaches its seasonal maximum in transport in winter. after forming, the eddies propagate westward just offshore of the continental slope, where they draw shelf water containing nutrients and phytoplankton into the deep offshore waters, as seen by the seawifs satellite ocean color sensor. in this manner, they enrich a region of the ocean that is dominated by downwelling-favorable wind forcing. off chile, the cape horn current is the analog of the alaska current, flowing poleward and driven by cyclonic winds, associated with winter storms. in this presentation we will use satellite fields of ssh and chlorophyll-a pigment concentrations to examine the relatively unstudied cape horn current and compare its seasonal behavior to the alaska current. we will specifically look for anticyclonic eddies, similar to those in the alaska gyre
ANTICYCLONIC EDDIES IN THE ALASKA GYRE (AND CAPE HORN CURRENT?)
P. Ted Strub
Gayana (Concepción) , 2004,
Abstract: Sea surface height (SSH) fields, constructed from multiple altimeters, have revealed the annual generation of anticyclonic eddies around the Alaska Gyre. These eddies appear to develop annually along the eastern margin of the Gyre from instabilities in the poleward Alaska Current, after it reaches its seasonal maximum in transport in winter. After forming, the eddies propagate westward just offshore of the continental slope, where they draw shelf water containing nutrients and phytoplankton into the deep offshore waters, as seen by the SeaWiFS satellite ocean color sensor. In this manner, they enrich a region of the ocean that is dominated by downwelling-favorable wind forcing. Off Chile, the Cape Horn Current is the analog of the Alaska Current, flowing poleward and driven by cyclonic winds, associated with winter storms. In this presentation we will use satellite fields of SSH and Chlorophyll-a pigment concentrations to examine the relatively unstudied Cape Horn Current and compare its seasonal behavior to the Alaska Current. We will specifically look for anticyclonic eddies, similar to those in the Alaska Gyre
The Anterior Spreader Flap: A Minimally Invasive Alternative to the Auto Spreader Flap in the Treatment of Patients with Nasal Valve Dysfunction  [PDF]
Stephan Bessler, Konrad Mende, Leonid Goubergrits, Jan Osman, Benedikt Strub
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2014, DOI: 10.4236/ijohns.2014.34034
Abstract:

We present a new method of treatment for nasal valve dysfunction caused by insufficiency or stenosis in a patient who refused open septum revision despite a significant degree of septum deviation. The Anterior Spreader Flap (ASF) technique was suggested as an alternative to open nasal septum revision and was performed under local anesthesia. Computational fluid dynamics (CFD) tests were performed pre- and post-operatively and our patient was asked to complete a self-assessment using a Visual Analog Scale (VAS) for nasal breathing (0 = free nasal breathing, 10 = complete nasal blockage) before and 12 months after surgery. The ASF is a minimally invasive endonasal procedure in which the caudal edge of the upper lateral cartilage is dissected from the septum, and folded inwards and fixed. The ASF allows for less airflow resistance and more free space. CFD techniques revealed a reduction in local pressure based on extended space. In addition, VAS scores improved from 9 to 2 points (right side) and from 8 to 2 points (left side). On the basis of these findings, the ASF technique can be considered a safe, minimally invasive spreader flap technique. It can easily be combined with other nasal surgical techniques, as it is necessary in most cases. In selected cases, the ASF may be performed as a single procedure in patients with nasal valve dysfunction caused by septum deviation as an alternative to open septum revision.

El Ni o and La Ni a Effects on the NE Pacific Circulation, with Some Comparison to the SE Pacific
P. Ted Strub,Corinne James
Investigaciones Marinas , 2002,
Abstract:
Gene induction during differentiation of human monocytes into dendritic cells: an integrated study at the RNA and protein levels
C. Angénieux,D. Fricker,J. M. Strub,S. Luche,H. Bausinger,J. P. Cazenave,A. Van Dorsselaer,D. Hanau,H. de la Salle,T. Rabilloud
Quantitative Biology , 2006, DOI: 10.1007/s101420100037
Abstract: Changes in gene expression occurring during differentiation of human monocytes into dendritic cells were studied at the RNA and protein levels. These studies showed the induction of several gene classes corresponding to various biological functions. These functions encompass antigen processing and presentation, cytoskeleton, cell signalling and signal transduction, but also an increase in mitochondrial function and in the protein synthesis machinery, including some, but not all, chaperones. These changes put in perspective the events occurring during this differentiation process. On a more technical point, it appears that the studies carried out at the RNA and protein levels are highly complementary.
Large-Scale Chlorophyll Variability Along the Eastern Pacific Coastal Margin
Andrew Thomas,Peter Brickley,P. Ted Strub
Investigaciones Marinas , 2002,
Abstract:
Morse bifurcations of transition states in bimolecular reactions
Robert S. MacKay,Dayal C. Strub
Mathematics , 2015, DOI: 10.1088/0951-7715/28/12/4303
Abstract: The transition states and dividing surfaces used to find rate constants for bimolecular reactions are shown to undergo qualitative changes, known as Morse bifurcations, and to exist for a large range of energies, not just immediately above the critical energy for first connection between reactants and products. Specifically, we consider capture between two molecules and the associated transition states for the case of non-zero angular momentum and general attitudes. The capture between an atom and a diatom, and then a general molecule are presented, providing concrete examples of Morse bifurcations of transition states and dividing surfaces. The reduction of the $n$-body systems representing the reactions is discussed and reviewed with comments on the difficulties associated with choosing appropriate charts and the global geometry of the reduced spaces.
Bifurcations of transition states: Morse bifurcations
Robert S MacKay,Dayal C Strub
Mathematics , 2013, DOI: 10.1088/0951-7715/27/5/859
Abstract: A transition state for a Hamiltonian system is a closed, invariant, oriented, codimension-2 submanifold of an energy-level that can be spanned by two compact codimension-1 surfaces of unidirectional flux whose union, called a dividing surface, locally separates the energy-level into two components and has no local recrossings. For this to happen robustly to all smooth perturbations, the transition state must be normally hyperbolic. The dividing surface then has locally minimal geometric flux through it, giving an upper bound on the rate of transport in either direction. Transition states diffeomorphic to $\mathbb S^{2m-3}$ are known to exist for energies just above any index-1 critical point of a Hamiltonian of $m$ degrees of freedom, with dividing surfaces $\mathbb S^{2m-2}$. The question addressed here is what qualitative changes in the transition state, and consequently the dividing surface, may occur as the energy or other parameters are varied? We find that there is a class of systems for which the transition state becomes singular and then regains normal hyperbolicity with a change in diffeomorphism class. These are Morse bifurcations. Various examples are considered. Firstly, some simple examples in which transition states connect or disconnect, and the dividing surface may become a torus or other. Then, we show how sequences of Morse bifurcations producing various interesting forms of transition state and dividing surface are present in reacting systems, by considering a hypothetical class of bimolecular reactions in gas phase.
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