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Topic: Boundary Field

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	Boundary conformal field theory - Wikipedia, the free encyclopedia
		In theoretical physics, boundary conformal field theory (BCFT) is a conformal field theory defined on a spacetime with a boundary (or boundaries).
		Different kinds of boundary conditions for the fields may be imposed on the fundamental fields; for example, Neumann boundary condition or Dirichlet boundary condition is acceptable for free bosonic fields.
		The specific types of boundary conditions in a specific CFT describe different kinds of D-branes.
	en.wikipedia.org /wiki/Boundary_conformal_field_theory (121 words)

	CORMIX Image Gallery: Boundary Interactions (Site not responding. Last check: 2007-10-30)
		Boundary interaction occurs when the flow contacts the surface, bottom, or forms a terminal layer in a density-stratified ambient environment.
		Boundary interaction generally provides the transition from near-field (discharge source controlled) to far-field (ambient controlled) mixing processes as illustrated by the image on the right.
		However, boundary interaction in the form of dynamic plume attachments to the bottom are considered near-field mixing processes.
	www.cormix.info /picgal/boundary.php (851 words)

	A Comparison of 3D Magnetic Field Calculations Based on Different Models and Boundary Conditions
		The magnetic field was generated by P_1,1 with l = 0.3 and FAI = PI / 2, where P_1,1 is the eigenfunction corresponding to eigenvalue a_1,1 = sqrt(0.425) (Low and Lou, 1990), l is the location of source point that is at (0,0,-l).
		The vector field is shown in Figure 01 where the contour represents longitudinal component with level of 20, 40, 80, 160 Gauss and the arrows are transverse component.
		The pattern and twist of the field are influenced by transverse magnetic component and by chosen alpha in non-linear force-free field and linear force-free field respectively.
	soi.stanford.edu /~yliu/fieldcomp/fieldcomp.html (810 words)

	A Hybrid Magnetic Field Solver Using a Combined Finite Element/Boundary Element Field Solver
		Thus the field is calculated by integrating the unknown with the curl of the Green's function.
		In general the strategy is to use the boundary elements in all linear regions and finite elements in all nonlinear regions.
		This problem is ideally suited for a hybrid solution where boundary elements are used to calculate the field in the air space and finite elements are used in the nonlinear iron.
	www.integratedsoft.com /papers/research/hybrid (2342 words)

	Boundary-Layer Research
		The structure and dynamics of the lowest layer of the atmosphere which comprises the planetary boundary layer (PBL) are of vital importance for the understanding of weather and climate, the dispersion of pollutants, and the exchange of heat, water vapor, and momentum with the underlying surface.
		Present emphasis is on the role of the boundary layer in the growth and decay of cyclones and satellite capabilities in ocean measurements.
		Faculty and students are engaged in a variety of field and theoretical projects including the study of surface fluxes, mesoscale variations in boundary-layer structure, and effects of variable terrain and variable seastate.
	www.atmos.washington.edu /academic/boundary_layer.html (404 words)

	Astron. Astrophys. 362, 395-405 (2000)
		The fan planes define the boundary between the magnetic field that is connected to the sources and the overlying field that is not connected to either source.
		Allowing the field to relax to a potential field outside the separator, means that the field line topology after the interaction is similar to the initial condition with only the sources having changed position.
		In Longcope 1998 the continued relaxation to a near potential field and continued stressing means that the topology all the time has a magnetic separator line defined by the intersection of the fan planes of the two nulls.
	aa.springer.de /papers/0362001/2300395/sc3.htm (4131 words)

	Boundary Field - Wikipedia, the free encyclopedia
		Boundary Field is a former baseball ground located in Washington, D.C. The ground was home to the Washington Nationals of the American Association in 1891 and then the National League from 1892 to 1899 after the League absorbed the Association.
		The League contracted in 1900 and the Nationals were a casualty.
		The field was also called National Park and was on the same site as Griffith Stadium.
	en.wikipedia.org /wiki/Boundary_Field (159 words)

	CWSS-SCM Field Boundary Book
		Field boundary habitats are ubiquitous features of the agricultural landscape that have received very little research attention in most of Canada.
		The chapters reflected the structural diversity of field boundary habitats in the Canadian agricultural landscape and emphasized the complexity of pest management in relation to these habitats.
		Understanding the role of field margins in maintaining species and habitat diversity, protecting sensitive areas, preserving air and water quality, and reducing soil erosion, while managing weed, insect and disease pests, will continue to be a challenge in Canada.
	www.cwss-scm.ca /field_boundary_book.htm (349 words)

	Boundary Conditions
		The near field boundary conditions, used in solving the differential equation, are defined from the knowledge that the faces of the crack surface are traction-free.
		The near field boundary conditions for a Mode I fracture occurs when all of the stresses equal zero on a face of the element, where y=0 and signifies beginning of the crack at the top of the element.
		Both the near field and the far field boundary conditions will be used to solve the differential equations for a fracture ahead of a crack tip in the following sections of this tutorial.
	www.shodor.org /~jingersoll/weave4/tutorial/node10.html (742 words)

	CCR Science:Open/Closed Field (Site not responding. Last check: 2007-10-30)
		It is a fundamental boundary of the magnetosphere that separates the plasma that is constrained by the earths magnetic field from that which has free access to/from the solar wind and magnetosheath.
		With this study we attempt to identify this boundary at high altitudes (about 0.3 to 0.6 of the distance to the magnetopause) and at mid to high latitudes, using plasma and energetic particle data from two high altitude polar orbiting satellites, Polar and HEO 95-034 for all conditions.
		This paper identifies the open/closed field line boundary for 155 traversals of the dayside cusp/LLBL region.These data were examined for evidence of IMF and solar wind control of the OCB.
	leadbelly.lanl.gov /ccr/cgi-bin/science_thrusts/science.cgi/2f (690 words)

	A global MHD and empirical magnetic field model investigation of the magnetospheric cusp
		Field line configurations indicate a significantly larger magnetosphere in the T96_01 model compared to the MHD model for all IMF directions.
		The MHD field depression is associated with the presence of diamagnetic magnetosheath plasma that enters the cusp via the MHD merging process.
		In this case the MHD dayside open-closed boundary extends from dawn to dusk, while the T96_01 dayside open-closed boundary extends only from dawn to ∼13 MLT and near local noon is coincident with the MHD boundary at ∼74° invariant latitude.
	www.agu.org /pubs/crossref/2001/2001JA900040.shtml (533 words)

	Meeting on Boundary Conformal Field Theory and its Perturbations
		Affine Toda field theories are closely related to the free field representations of perturbed conformal field theories.
		The integrable boundary conditions of affine Toda theory, which have been studied closely by the Durham group, should be related to the corresponding relevant boundary operators.
		Furthermore the interesting boundary spectrum of affine Toda theories with a boundary should be understandable in terms of the Hilbert space of the boundary CFT.
	www.mth.kcl.ac.uk /events/past_events/bcftmeeting.html (592 words)

	Gestalt! Vol.5; No.2 - A Discussion of Field Theory in Gestalt Therapy
		Boundary ought to be thought of in the context of the person's/organism's "life space," where and how it does business with others.
		But that field is not isolated from the general environment or from the influences (the many other spheres of influence or fields) I bring with me. The results of my study may well influence governmental policy, which, in turn is likely to alter the domain I have studied.
		Boundary is what unites mind and brain; it is the interpenetration of the experiential and the substantive in the field.
	www.g-gej.org /5-2/1998field.html (11384 words)

	Identifying the open-closed field line boundary in magnetospheric and ionospheric data sets
		As a spacecraft passes from the outer magnetosphere into the magnetopause boundary layer on the dayside of the Earth, an initial signature of this transition is the loss of magnetospheric electrons, escaping from their trapped location on closed magnetospheric field lines.
		The focussing of the open field line regions of the magnetosphere to small regions of the polar ionospheres allows multiple measurements of the OCB to be made from ground-based instruments or from spacecraft measuring auroral images of the ionosphere.
		We investigate and compare boundary crossings arising from spacecraft encounters with discontinuities in the solar wind, the bow shock, the magnetopause and the magnetotail, which are observed by Cluster on multiple scales (ranging from 6000?100 km).
	www.mist.ac.uk /mistg203.html (4848 words)

	*Pixelcharmer: Field Notes: Boundary Object
		Here in “Taxonomy is a boundary object” he mentions something I learned this semester studying technology from a social science perspective.
		I first encountered the term boundary object when reading “Distributing intelligence, organizing diversity,” [PDF] a study of a silicon alley new media firm.
		The boundary object serves to bring different communities of practice together.
	www.pixelcharmer.com /fieldnotes/archives/process_researching/2003/000392.html (126 words)

	OCB: Identifying the open-closed field line boundary in magnetospheric and ionospheric data sets (Site not responding. Last check: 2007-10-30)
		The ability to identify and track the location of the boundary between closed terrestrial magnetic flux and open flux interconnected with the interplanetary magnetic field allows the electrodynamics of the magnetospheric system to be investigated, specifically the storage and release of magnetic energy within the magnetosphere.
		A wide range of instrumentation (spacecraft field and particle instruments, ionospheric radars, and optical instruments) have been employed to identify this boundary within the magnetosphere-ionosphere system.
		The aims of this meeting are to review the different techniques used to determine this boundary, to understand their strengths and weaknesses, to investigate how well the boundary identifications from different techniques correlate, and to identify and address the important science questions for which an accurate identification of the open-closed field line boundary is crucial.
	www.antarctica.ac.uk /Meetings/2003/OCB/index.html (336 words)

	Field Boundaries (Site not responding. Last check: 2007-10-30)
		For the purposes of this Action Plan, the term 'field boundaries' refers to arable field margins and to boundary structures such as hedgerows, field drains, main drainage channels, sandstone walls and road verges.
		Estimating average field size to be 12ha, there are about 400,000km of cereal field edge in the UK.
		An Action Plan for Cereal Field Margins is included in the UK Steering Group Report (1995), aiming to maintain and enhance 15,000 ha of cereal field margins at a cost of £1.1million per annum in 2000, rising to £2.1million per annum in 2010.
	www.wirral.gov.uk /ed/biodiversity/fieldb.htm (1092 words)

	Tail Lobe...AdvSpSci_Cospar96
		For simplicity, we take the OC boundary to be consistent with the low latitude edge of the cusp near noon, the high latitude edge of the boundary layer away from noon on the dayside, and the high latitude edge of the plasma sheet boundary layer in the pre-dusk through midnight to pre noon regions.
		The boundaries, marked with the vertical lines near 1250 and 1930 UT, were the estimated open/closed field line transitions for this orbit of HEO 95-034.
		The positions of the OC boundary determined from the HEO 95-034 and POLAR data are shown in Figure 3, panels (a) through (e) and (aa) through (ee), respectively.
	leadbelly.lanl.gov /ccr/publications/96_asr_fennell/oc_bndry.html (2593 words)

	EN222: Mechanics of Solids - Slip Line Fields
		There is a vast catalog of solutions to linear elastic boundary and initial value problems. In contrast, there are very few exact solutions to boundary value problems involving plastically deforming solids. Such solutions as exist are usually either for highly simplified geometries (e.g.
		The largest class of solutions to boundary value problems in plasticity exploits a technique known as slip line field theory. The method is not widely used these days (because it’s a lot harder to use than an FEM package!) but it does provide analytical solutions to a number of very difficult problems (e.g.
		When solving a particular boundary value problem, the central issue will be to identify a set of characteristic lines that will satisfy the boundary conditions. Field equations reduce to simple ODEs that govern variations of hydrostatic pressure and velocity along each slip line.
	www.engin.brown.edu /courses/en222/Notes/sliplines/sliplines.htm (949 words)

	boundary
		From the point of view of general principles, the space-time approach to quantum mechanics and quantum field theory, and its application to the quantization of gravitational interactions, remains indeed of fundamental importance.
		On the other hand, in the application to quantum gravity, since the boundary operator acquires new kernels responsible for the pseudo-differential nature of the boundary-value problem, one might hope to be able to recover a good elliptic theory under a wider variety of conditions.
		Boundary field theory is therefore very important for understanding quantum cosmology, quantum gravity and the foundations of quantized gauge theories, and it has deep roots in global analysis and spectral geometry.
	www.na.infn.it /Theor/gruppoiv/giespo/boundary.html (1966 words)

	Impact Field Studies Group - 2005 Brazos River KT Boundary Field Trip
		On Sunday, March 13th, 2005, the Impact Field Studies Group hosted its second annual LPSC field trip.
		This year we visited the KT boundary exposures on the bank of the Brazos, River and two of its small tributaries in Falls Co., Texas.
		Hiking in the field above the Brazos River
	web.eps.utk.edu /ifsg_files/2005_brazos_trip.html (213 words)

	Fermion representation of the rolling tachyon boundary conformal field theory
		A free fermion representation of the rolling tachyon boundary conformal field theory is constructed.
		The representation is used to obtain an explicit, compact, exact expression for the boundary state.
		We use the boundary state to compute the disc and cylinder amplitudes for the half-S-brane.
	stacks.iop.org /1126-6708/2005/i=05/a=072 (281 words)

	Field Margins and Boundary Habitats
		Field margins and boundary habitats are management options in the current Rural Stewardship Scheme.
		SAC is currently developing a training course entitled "Encouraging biodiversity on the farm" which includes field margin management and is aimed at farmers and others involved in the rural sector.
		Grampian FWAG lectures on 3 courses at Aberdeen University (MSc Land management, MA/BSc Countryside Management and BSc Ecology), field boundary management is a part of these lectures and field courses.
	www.abdn.ac.uk /biodiversity/actionplans/LBAP/fieldmargins.htm (649 words)

	Citebase - Boundary Conformal Field Theory
		Boundary conformal field theory (BCFT) is simply the study of conformal field theory (CFT) in domains with a boundary.
		It gains its significance because, in some ways, it is mathematically simpler: the algebraic and geometric structures of CFT appear in a more straightforward manner; and because it has important applications: in string theory in the physics of open strings and D-branes, and in condensed matter physics in boundary critical behavior and quantum impurity models.
		In this article, however, I describe the basic ideas from the point of view of quantum field theory, without regard to particular applications nor to any deeper mathematical formulations.
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-th/0411189 (170 words)

	MapShots - JDO Boundary Tool
		The JDO Boundary Tool is a simple utility that modifies the shapefiles exported by John Deere's JDOffice application.
		In the case of the JDO boundary exports, the fourth column has its name changed from "" (a null string) to "W", and the column represents the area of the exported boundary.
		The open Field Operation Data Model (FODM) syntax has a definition for clients, farms, fields, cropzones, etc. As more companies migrate to FODM for importing field operations data, it may be more convenient to import JDOffice field boundaries as FODM Domains (farms, fields, etc).
	www.mapshots.com /downloads/JDOTools.asp (661 words)

	SNMP Field Layout Tool
		It is reached by clicking the Field Boundaries button on the Main Menu.
		Use this tool to split an existing field into two parts.
		Use this tool to alter and finely adjust an existing field boundary.
	www.cares.missouri.edu /snmp/help/web_tutorial/fieldtools.html (161 words)

	Commemorations of The Somme
		The fields of the Somme may have been ploughed eighty or more times since the days of the battle, and all the immediate hindrances to agriculture removed, but ploughing touches only the surface.
		These fields were the anvil on which the metal of the Pals was tested.
		There is always a small Field of Remembrance - a small area marked out in the grass near the memorial and here people stick the little wooden crosses which the Royal British Legion sell at this time of year.
	www.gwpda.org /memoir/somme.html (19952 words)

	[No title]
		The subroutines require input of the conditions of the Helmholtz field - the wavenumber, a geometrical description of the boundary of the domain (as covered in Chapter 2) and a list of the points in the exterior domain where a solution is sought, the boundary condition, the incident field (if any).
		That is finding the solution of (5.27) subject to the discrete boundary condition (5.28).
		The boundary (S) is approximated by a set of planar triangular elements.
	www.boundary-element-method.com /helmholtz/manual/chap5/sect5_5.htm (499 words)

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