The existence of an accretion column in 32 Cyg is reported, and the presence of the accretion column

We consider time-dependent accretion onto magnetized white dwarfs. A detailed description of a numerical method of solution to the hydrodynamical equations is given. The postshock flow is cooled by optically thin bremsstrahlung and is thermally unstable. As a result the shock height undergoes periodic oscillations. We consider the properties of this oscillation as a function ...

The polarized radiation from accretion shocks with a three-dimensional structure are calculated for the first time. It is shown that, because of inhomogeneities along the flow lines, accretion columns with a uniform accretion rate across the column can also produce flat ...

Highly nonstationary accretion onto a magnetized neutron star from a surrounding accretion disc is considered. Nonstationary accretion has been considered before in terms of droplets or rain or as a necessary consequence of instabilities in the accretion column flow. Here, the extreme of very ...

A model of the X-ray radiation emitted from the accretion column of a compact object in AM Herculis binaries, using Monte Carlo methods is presented. The accretion column in the model has cylindrical symmetry. Above a shocked region in the column there is...

We consider the problem of the flow produced by the accretion of gas from a rotating cloud onto a point gravitational source. It is shown that, for a cloud initially in uniform rotation, the effect of accretion is to produce a Taylor column in the cloud parallel to the rotation axis. Only gas within the column is ...

Five AM Herculis binary systems show an optical QPO that is known to be associated with magentically channeled polar cap accretion. Hard X-ray QPOs are predicted by the time-depndent hydrodynamic models. We propose to search selected AM Her systems for polar cap X-ray QPOs using the XTE PCA. Because of its large collecting area, the PCA is the only instrument that can do this ...

accretion? " What is the structure of the inner disk? " How do accretion disks drive jets? ... IXO will reveal the physics of disk accretion, and low L_X ...

We calculate the structure of an effectively optically thin and geometrically thin accretion disk in

... accretion rates and total accretion on structures are given, and extracts from US and Canadian codes for ice and wind loads on structures are ...

The problem of spectral formation in accretion-powered X-ray pulsars was solved for the first time using an analytical model based on the fundamental physics in 2007, and the resulting spectra were shown to agree rather closely with those observed from several of the most luminous sources. However, in order to derive the analytical solutions, simplifying assumptions were made ...

We analyzed thermonuclear (type I) X-ray bursts observed from the low-mass X-ray binary 4U 1728-34 by RXTE, Chandra, and INTEGRAL. We compared the variation in burst energy and recurrence times as a function of accretion rate with the predictions of a numerical ignition model including a treatment of the heating and cooling in the crust. We found that the measured burst ...

data yield the accretion disk thickness, diameter, electron density, and magnetic field. Introduction. The structure of AGN accretion disks on sub-parsec ...

Equations for the structure and appearance of supercritical accretion disks and the radiation-driven

We present new models for illuminated accretion disks, their structure and reprocessed emission. We consider the effects of incident X-rays on the surface of an accretion disk by solving simultaneously the equations of radiative transfer, energy balance and ionization equilibrium over a large range of column ...

We present new models for illuminated accretion disks, their structure, and reprocessed emission. We consider the effects of incident X-rays on the surface of an accretion disk by simultaneously solving the equations of radiative transfer, energy balance, and ionization equilibrium over a large range of column ...

We present new models for illuminated accretion disks, their structure, and reprocessed emission. We consider the effects of incident X-rays on the surface of an accretion disk by simultaneously solving the equations of radiative transfer, energy balance, and ionization equilibrium over a large range of column ...

The structure of AGN accretion disks on sub-parsec scales can be probed t,hrough ... GHz to map absorption caused by an inner accretion disk. ...

Values for the maximum frequency up to which cyclotron radiation in the accretion columns of magnetic degenerate stars is self-absorbed are presented and the results applied to the Am Herculis binaries and Hercules X-1.

... Icephobic coatings have the potential for reducing ice accretion, and testing of candidate materials should be undertaken. ...

A possible interpretation of the strong Fe-K line is the line-photon beaming in the WD accretion column, due to resonance scattering of line photons ...

... Title : BUCKLING OF COLUMNS IN THE ... required for a column to collapse ... Descriptors : *BEAMS(STRUCTURAL), COMPRESSIVE PROPERTIES ...

the gas density is of order 10 kgm \\Gamma3 . High energy pro� tons in the accretion column scatter offLoss Processes in the Accretion Column Accelerator of Hercules X�1 P. A. Johnson Department of Physics and Mathematical Physics University of Adelaide, Australia 5005. Abstract The energy loss

The twelfth accretion-powered millisecond pulsar, IGR J17511-3057, was discovered in 2009 September. In this work we study its spectral and timing properties during the 2009 outburst based on Swift and RXTE data. Our spectral analysis of the source indicates only slight spectral shape evolution during the entire outburst. The equivalent width of the iron line and the apparent ...

... ANALYSIS OF COLUMN AND PLATE ... cross-section, columns with various ... Descriptors : (*BEAMS(STRUCTURAL), STRUCTURAL PROPERTIES ...

We present for the first time, the self-consistent solution of the two-dimensional, time-dependent equations of radiation-hydrodynamics governing the accretion of matter onto the highly magnetized polar caps of luminous x-ray pulsars. The calculations show a structure in the accretion column very different from ...

We present for the first time, the self-consistent solution of the two-dimensional, time-dependent equations of radiation-hydrodynamics governing the accretion of matter onto the highly magnetized polar caps of luminous x-ray pulsars. The calculations show a structure in the accretion column very different from ...

Using Chandra HETG data we present light curves for individual spectral lines of Mg XI and Mg XII for EX Hydrae, an intermediate-polar type cataclysmic variable. The Mg XI light curve, folded on the white dwarf spin period, shows two spikes that are not seen in the Mg XII or broad-band light curves. Occultation of the accretion column by the body of the ...

We present X-ray spectral analysis of the accreting young star TW Hydrae from a 489 ks observation using the Chandra High Energy Transmission Grating. The spectrum provides a rich set of diagnostics for electron temperature Te , electron density Ne , hydrogen column density NH , relative elemental abundances, and velocities, and reveals its source in three ...

We present X-ray spectral analysis of the accreting young star TW Hydrae from a 489 ks observation using the Chandra High Energy Transmission Grating. The spectrum provides a rich set of diagnostics for electron temperature T{sub e} , electron density N{sub e} , hydrogen column density N{sub H} , relative elemental abundances, and velocities, and reveals ...

... Title : Structural Evaluation of Long Boron Composite Columns. ... epoxy composite tubes as long column members in ... columns 8 ft long and 3.2 in in ...

The results of external counting after intravenous administration of Sr/ sup 85/ in 1O cases of vertebral fractures are shown. The possibilities and limitations of this method in calculating the local bone accretion rate in spine fractures are discussed. (auth)

The problem of spectral formation in accretion-powered X-ray pulsars was solved for the first time using an analytical model in 2007. Based on fundamental physics, the resulting model spectra were shown to agree closely with those observed from several of the most luminous X-ray pulsars. However, to derive the analytical solutions, simplifying assumptions were made regarding ...

... of columns loaded biaxially, ie, columns subjected to ... Descriptors : (*BEAMS(STRUCTURAL), LOADS(FORCES)), (*STEEL, BEAMS( ...

... The results are applied to structural steel columns and it is determined that the load causing column failure is trivially greater than the critical load ...

... loaded simply supported columns of rectangular ... of the column and the ... (Author). Descriptors : *STRUCTURAL COMPONENTS, *BUCKLING, LOADS ...

... for all the restrained columns was maintained ... predictions from restrained column theory. ... Descriptors : (*BEAMS(STRUCTURAL), LOADS(FORCES ...

... Title : Compressive Properties and Column Efficiency of ... In addition, tube columns are attractive because ... carrying capacity and structural efficiency. ...

... Title : Column Buckling of Isotropic ... Descriptors : *BEAMS(STRUCTURAL), *BUCKLING, *COLUMNS(SUPPORTS), COMPUTATIONS ...

... Plane Frame Beam Column Element for ... VISCOELASTICITY, VISCOPLASTICITY, BEAMS(STRUCTURAL), COLUMNS(SUPPORTS), FRAMES ...

Galactic black holes (GBH) are a class of astrophysical sources with X-ray emission that is powered by accretion from a companion star. An important goal of GBH research is to understand the accretion structure and the nature of the variability of these systems. The GBHs sometimes show significant changes in the X-ray emission ...

The magnetorotational instability (MRI) is the most likely candidate for angular momentum transport and radial flow of mass in protoplanetary disks (PPDs), but demands a minimum ionization fraction for the gas to couple to the magnetic field. It is known that large regions of PPDs are insufficiently ionized for the MRI to act, and are �dead zones.� Only at the disk�s surface will the MRI ...

Young stellar objects exhibit X-ray emission throughout their evolution. The emission above about 1 keV is primarily produced from coronal structures and flares, indicating that magnetic activity is present from early on. For stars that are still actively accreting, X-ray accretion signatures of accretion are only ...

... Abstract : Ice accreted on structures from freezing rain causes both increased vertical loads and increased wind loads, due to the larger projected ...

Unstable thermonuclear ignition of accreted fuel on neu- tron stars (NSs) in low -mass X-ray binaries (LMXBs) is triggered once a critical column density is ...

Aug 6, 2003 ... 12:00 12:30 Cyclotron Emission From Accretion Columns: I. Andronov ... 09:00 10:00 Diagnostics and visualization of biological tissues: ...

... be used to determine the gas temperatures and column densities. ... K was used to set the �ux density at other ... F ul /lg u A ul energy level, where is ...

Jan 14, 2005 ... [C] They contain accretion 'columns' and 'curtains' [D] All of the above. What are super-soft sources? [A] X-ray emitting objects that are ...

... structural beam-column matrix. ... DIMENSIONAL, BEAMS(STRUCTURAL), STIFFNESS ... PLASTIC PROPERTIES, COLUMNS(SUPPORTS), POISSON ...

... the general beam-column system considered ... DESIGN, *BEAMS(STRUCTURAL), *SOIL STRUCTURE INTERACTIONS, *COLUMNS(SUPPORTS ...

... THE RADIUS OF THE POSITIVE COLUMN AND THE FORM OF ... ELECTRIC DISCHARGES, HYDROGEN, INTEGRALS, THERMAL CONDUCTIVITY ...

... along the entire length of columns for multistory ... Descriptors : (*BEAMS( STRUCTURAL), *REINFORCED CONCRETE), (*BUILDINGS, BEAMS ...

... Title : DESIGN PROCEDURES FOR FIBER COMPOSITE STRUCTURAL COMPONENTS: RODS, COLUMNS, AND BEAM COLUMNS. ...

In this thesis we use phase-resolved cyclotron spectroscopy to study polars. Polars are a subset of cataclysmic variables where the primary WD is highly magnetic. In this case, the accretion flow is constrained along the magnetic field lines and eventually deposited on the WD, where the accreting material interacts with the atmosphere, forming a standing ...

The formation of thick stellar disks in spiral galaxies is studied. Simulations of gas-rich young galaxies show formation of internal clumps by gravitational instabilities, clump coalescence into a bulge, and disk thickening by strong stellar scattering. The bulge and thick disks of modern galaxies may form this way. Simulations of minor mergers make thick disks too, but there is an important ...

By applying an analytical solution to the envelope, hydrogen shell flashes on accreting white dwarfs are computed semianlytically from their ignition to their final stage. When the mass of the white dwarf, M, and the mass of the hydrogen-rich envelope, ..delta..M/sub 1/, are specified, their progress is determined uniquely. Structural change and the ...

Young stellar objects radiate large numbers of keV-photons that are able to penetrate significant columns of gas and thus ionize and heat circumstellar material, including the accretion disks and outflows of very young stars. The unshielded ionization rates are high. At a distance of 1 AU from a young stellar object with a moderately strong X-ray source, ...

(� \\Gamma5 km s \\Gamma1 ), possibly associated with a disk wind or magnetic accretion columns. The velocity (Beckwith and Sargent, 1993; Strom et al. 1993). Evidence that these disks accrete onto the stellar surface protostellar disks form and evolve (Strom, Edwards and Skrutski, 1993; Walter et al. 1988). At ages � ? 10 Myr

A new burst mode of MXB 1730-335, the rapid burster, as discovered by Hakucho in August 1979, is characterized by a train of long X-ray bursts whose behavior is dictated by the accretion rate. In this mode the burst luminosity reaches the Eddington limit, so that the X-ray pressure controls the accretion from a reservoir in the magnetopause, and ...

... of structural efficiency parameters are developed for lightly loaded columns and are used to show a comparison of the masses of the four column ...

... the response of a number of structural steel or ... terrorist explosions by designing the columns for an ... height lateral deflection of the column which will ...

... When the vertebral column is considered as a structural member, a finite limit on nonfracturing accelerations can be specified, as has previously ...

... COLUMNS(SUPPORTS), *REINFORCED CONCRETE, *BUILDINGS, COMPOSITE STRUCTURES, REINFORCED PLASTICS, STRUCTURAL ...

... The clamped-column case provides an example ... Descriptors : *Structural engineering, *Optimization, *Columns(Supports), *Structural ...

... Title : Local Buckling of FRP Structural Shapes,. ... is demonstrated for various columns sections and ... Southwell's method for long column buckling is ...

... The beam-column with an initial curvature is also discussed. (Author). Descriptors : (*BEAMS(STRUCTURAL), STRUCTURAL PROPERTIES ...

... method of analyzing beam columns. ... the beam column is related ... FORCES)), (*BEAMS(STRUCTURAL), STRUCTURAL PROPERTIES, SUPPORTS ...

... developed and applied to columns. ... insights into column behavior which do ... Descriptors : (*BEAMS(STRUCTURAL), *BUCKLING), STRUCTURAL ...

A resonant scattering model for photon reprocessing in a pulsar accretion column is presented. The accretion column is optically thin to Thomson scattering and optically thick to resonant scattering at the cyclotron frequency. Radiation from the neutron star surface propagates freely through the ...

The influence of the hot spot that very likely forms at the base of the accretion column of X-ray pulsars with X-ray luminosities not much larger than ?1030W onto emitted spectra and angle dependent fluxes is discussed.

Step by step procedures are described which are used to design structural components (rods, columns,

... Column and plate compressive strengths of eJttruded 24S_T ... tests of H-, Z- and channel-section columns. ... provide data on the structural strength of ...

... Methods (2) CROSS REFERENCES: Columns - Stresses (23596 ... Column and plate compressive strengths of aircraft structural materials - 2i»ST ...

... Abstract : Column and plate compressive strengths of extruded ... of H-, Z- and channel-section columns. ... to provide data on the structural strength of ...

High-resolution spectra of low mass X-ray dipping sources would reveal the strong absorption line structures, which could be used for a better understanding of the accretion disk structure. Here, we present a detailed spectral study and X-ray dust scattering halo results of the ``Big Dipper'' 4U 1624-490, based on our Chandra HETGS ...

We report the discovery of a dip structure in the pulse profile of Be/X-ray binary LS V +44 17 observed by RXTE during an outburst detected by MAXI. The outburst was first transient activity of LS V +44 17 since 1997 when the source was identified as a Be/X-ray binary. After the discovery with MAXI, the RXTE observations provided a pulse profile with a narrow dip ...

We investigate the intrinsic structure of the clouds surrounding AGN which give rise to their X-ray and optical emission properties. Using a complete sample of Swift BAT AGN selected in hard X-rays (14-195 keV), which is unbiased with respect to obscuration and extinction, we compute the reddening in the broad line region along the line of sight to the nucleus of each source ...

We perform a systematic study of physical properties and distribution of neutral and ionised gas in the halo of the Milky Way (MW). Beside the large neutral intermediate- and high-velocity cloud (IVC, HVC) complexes there exists a population of partly ionised gaseous structures with low column densities that have a substantial area filling factor. The ...

Differentially rotating structures in the prevalent field of a central object have been shown to develop a ``crystal'' magnetic structure resulting from toroidal internal currents and leading to the formation of density ring sequences ootnotetextB. Coppi and F. Rousseau, Ap. J. 641, 458 (2006) rather than disks. Poloidal current densities with appropriate ...

Columns are the key load-bearing elements in frame structures and exterior columns are probably the most vulnerable structural components to terrorist attacks. Column failure is normally the primary cause of progressive failure in frame structures. A high...

Mass accretion onto (proto-)stars at high accretion rates \\dot{M}_* > 10^{-4} M_{&sun;} yr^{-1} is expected in massive star formation. We study the evolution of massive protostars at such high rates by numerically solving the stellar structure equations. In this paper, we examine the evolution via disk ...

...the column shaft. (3) Columns shall be set on level finished...construction loads. (4) All columns shall be evaluated by a competent...the approval of the project structural engineer of record. (2) Prior to the erection of a column, the controlling...

...the column shaft. (3) Columns shall be set on level finished...construction loads. (4) All columns shall be evaluated by a competent...the approval of the project structural engineer of record. (2) Prior to the erection of a column, the controlling...

The accretion disc eclipse mapping method is an astrotomographic inversion technique that makes use of the information contained in eclipse light curves to probe the structure, the spectrum and the time evolution of accretion discs in cataclysmic variables. This paper presents examples of eclipse mapping results that have been key to ...

Studies of the structure of mid-ocean ridges and the processes involved at these accreting plate boundaries have played an important role in the development of plate tectonics models over the last two decades. During this time our concept of the accretion...

Results of two-dimensional gas dynamic computations of gas flow in symbiotic stars are presented, with radiation cooling of gas in the forming accretion disk taken into consideration. As computations show, radiation cooling does not change qualitatively the picture of the flow in the vicinity of the accreting star. The structure of the ...

We present a two-dimensional (2D) model for X-ray absorbing plasma based on well-defined magnetohydrodynamic (MHD) accretion disk winds. These winds are primarily characterized by only two parameters, accretion-rate m(dot) and line of sight (LOS) angle ?, for a given magnetic field geometry specified by a free-parameter q. This model naturally produces ...

Diffusive nuclear burning of H by an underlying material capable of capturing protons can readily consume H from the surface of neutron stars (NSs) during their early cooling history. In the absence of subsequent accretion, it will be depleted from the photosphere. We now extend diffusive nuclear burning to He, motivated by the recent observation by Ho \\& Heinke of a ...

Diffusive nuclear burning (DNB) of H by an underlying material capable of capturing protons can readily consume H from the surface of neutron stars (NSs) during their early cooling history. In the absence of subsequent accretion, it will be depleted from the photosphere. We now extend DNB to He, motivated by the recent observation by Ho & Heinke of a carbon atmosphere on ...

Diffusive nuclear burning (DNB) of H by an underlying material capable of capturing protons can readily consume H from the surface of neutron stars (NSs) during their early cooling history. In the absence of subsequent accretion, it will be depleted from the photosphere. We now extend DNB to He, motivated by the recent observation by Ho and Heinke of a carbon atmosphere on the ...

It is investigated whether Uranus models with higher values of the total planetary ice to rock ratio

... universe. They are thought to be powered by the accretion of gas onto super-massive black holes at the centers of galaxies. ...

Neutron Stars, Pulsars, Millisecond Pulsars, and Gravitational Radiation: GLOSSARY. Accretion disk: The flattened, pancake-like structure formed by matter ...

We present broadband analysis of the Be/X-ray transient 1A 1118-61 by Suzaku at the peak of its third observed outburst in 2009 January and two weeks later when the source flux had decayed by an order of magnitude. The continuum was modeled with a cutoffpl model as well as a compTT model, with both cases requiring an additional blackbody component at lower energies. We confirm the detection of a ...

This work focuses on the study of X-ray illuminated accretion disks around black holes by modeling their structure and reprocessed emission. The calculation of new models for the reflected spectra consider the effects of incident X-rays on the surface of an accretion disk by solving simultaneously the equations of radiative transfer, ...

We present the first detailed classification of the structures of Class 0 cores in a high-resolution simulation of a giant molecular cloud. The simulated cloud contains 104 M? and produces over 350 cores which allows for meaningful statistics. Cores are classified into three types according to how much they depart from spherical symmetry. We find that three-quarters of the ...

Ice accretion on structures built on the earth's surface is discussed. Sources of water are the atmosphere or water bodies near or surrounding the structure. Ice types include frost, rime, glaze, and spray; properties and conditions governing their format...

...as specified by the project structural engineer of record. (c) (1) Double connections at columns and/or at beam webs over a column. When two structural members on opposite sides of a column web, or a beam web...

...as specified by the project structural engineer of record. (c) (1) Double connections at columns and/or at beam webs over a column. When two structural members on opposite sides of a column web, or a beam web...

We propose a 400 ks follow-up HETGS GTO observation of MCG--6-30-15 to supplement the previous 120ks GTO look to probe in detail the warm absorber in this source. The high statistics are necessary to construct the distribution functions of the ionic column densities (using weak high-order lines), systematic and turbulent velocities, line variability, and the soft X-ray ...

An atlas of 14 seismic sections shows major tectonic features across various convergent margins. All sections are at the same scale and have been processed to a research level. Such processing produces clear images of sediment accretion from below. Most margins show sediment subduction. The results of tectonic erosion are seen in midslope areas as buttresses against which the ...

A power operated telescoping column is described for the deployment and retraction of a large parabolic antenna for space applications. The column consists of several axially elongated rigid structural sections nested within one another. The outermost and...

... column flange thickness, column web thickness ... STIFFENING, THESES, STRUCTURAL RESPONSE ... MECHANICS), BOLTS, COLUMNS(SUPPORTS ...

... Title : INELASTIC COLUMNS SUBJECTED TO PULSE ... the elastic column, can support ... Descriptors : *BEAMS(STRUCTURAL)), (*LOADS(FORCES ...

... the sponsorship of the Column Research Council. ... biaxially bent beam-columns of hollow ... Descriptors : *BEAMS(STRUCTURAL), BENDING, LOADS ...

... thrust for various shapes of structural sections with ... maximum load carrying capacity of the beam-columns. ... solution of the beam-column problem is ...

... of load duration for columns having the ... that an elastic column can support ... Descriptors : *STRUCTURAL COMPONENTS, ELASTIC PROPERTIES ...

... Abstract : The effect of creep on structural elements which ... A simple pin-ended column is analyzed under ... tests on 75 ST aluminum columns at 600F. ...

... a Single-Crossarm Stayed Column,. ... Descriptors : *BUCKLING, *COLUMNS( SUPPORTS), REPRINTS ... LOADS(FORCES), STRUCTURAL ANALYSIS ...

... axial force in these columns results from ... snap-through in the two-span column. ... Descriptors : (*BEAMS(STRUCTURAL), LOADS(FORCES)), STRAIN ...

The optional column/keyword filtering specifier is used to modify the column structure and/or the header keywords in the HDU that was selected with the ...

We study the accretion process in the region of the Preston-Poisson space-time describing a Schwarzschild black hole perturbed by an asymptotically uniform magnetic field and axisymmetric tidal structures. We find that the accretion disk shrinks and the marginally stable orbit shifts toward the black hole with the perturbation. The ...

The main aim in the current survey is to suggest models of the development of structures, such as vortices and spirals, in accretion white dwarf's binaries. On the base of hydrodynamical analytical considerations it is applied numerical methods and simulations. It is suggested in the theoretical model the perturbation's parameters of the ...

... this report allows representative structural subassemblages to ... behavior of beams and columns under real ... member remains the column; however, it ...

... beams and column defines the ... REQUIREMENTS, BEAMS(STRUCTURAL), STRENGTH(MECHANICS ... OF ENGINEERS, COLUMNS(SUPPORTS). ...

... that such research was a necessary step in the evolution of a rational design procedure for biaxially loaded box columns in structural frameworks. ...

... the instability due to thermal expansion becomes ... basic structural elements, rods (columns) and plates ... The analysis of column instability and post ...

... additional moments caused by the deflection delta at the column tops and the axial load in the columns) is investigated. The structural behavior of ...

... of Ships and to determine the structural response of ... L-shaped, three beam-columns of different depths, and transverse beam-column. ...

The vertebral column provides structural support for the trunk and surrounds and protects the spinal cord. The vertebral column also provides attachment points ...

... Title : SHORT-COLUMN COMPRESSIVE STRENGTH OF SANDWICH ... COMPOSITE MATERIALS, BEAMS(STRUCTURAL), DEFLECTION, TEST ...

... of fiber composite columns under compression is ... Descriptors : (*BEAMS( STRUCTURAL), COMPOSITE MATERIALS), (*COMPOSITE MATERIALS ...

... VIBRATIONS IN UNIFORM BEAM-COLUMNS ACCORDING TO ... Descriptors : (*BEAMS(STRUCTURAL), VIBRATION), EQUATIONS OF MOTION ...

... Restraint of the columns was provided by ... of restrained column theories proposed for ... Descriptors : *STEEL, STRUCTURAL PROPERTIES, LOADS ...

... testing of a miniature, column-based, interface ... Descriptors : *EXPLOSION EFFECTS, *STRUCTURAL RESPONSE, *GAGES, *UNDERGROUND ...

... function of column size and ... EPOXY COMPOSITES, *COLUMNS(SUPPORTS), *COMPOSITE ... CAPACITY, DUCTILITY, STRUCTURAL RESPONSE ...

... for predicting the buckling strength of an assembly of beams and beam-columns. (Author). Descriptors : (*BEAMS(STRUCTURAL), LOADS(FORCES ...

. After passing through the absorption column, the transmitted light impinged on a sodium salycilate

... thousand simulation column tests provided ... systematically evaluated for steel columns. ... LOADS(FORCES), *STRUCTURAL COMPONENTS, STEEL ...

... of a beam-column, whose individual ... Descriptors : *BEAMS(STRUCTURAL), *STRENGTH ... COMPRESSIVE PROPERTIES, COLUMNS(SUPPORTS ...

... on the Transient Response of a Stepped Column Subjected to ... Descriptors : *BEAMS(STRUCTURAL), *STIFFNESS, *BUCKLING, *AXIAL LOADS ...

... plastic columns have been obtained. On the basis of these buckling formulas, structural efficiency of fiber glass reinforced plastic column members ...

... STRUCTURAL ANALYSIS, LIMITATIONS, TRUSSES, FOUNDATIONS( STRUCTURES), COLUMNS(SUPPORTS), STRUCTURAL STEEL. ...

We present the two-dimensional ionization structure of self-similar magnetohydrodynamic winds off accretion disks around and irradiated by a central X-ray point source. On the basis of earlier observational clues and theoretical arguments, we focus our attention on a subset of these winds, namely those with radial density dependence n(r) vprop 1/r (r is ...

... Title : STRUCTURAL INFLUENCE COEFFICIENTS FOR A REDUNDANT SYSTEM INCLUDING BEAM-COLUMN EFFECTS: ANALYTICAL ...

... structures, eg the tower of suspension ... EARTHQUAKE RESISTANT STRUCTURES, VIBRATION ... FORCES), BUCKLING, TOWERS, COMPRESSIVE ...

We present new results from the Chandra HETGS on the accretion disk wind in the bizarre ? state of GRS 1915+105. Renowned for its discrete jet ejections and its implications for the disk-jet connection around accreting black holes, the ? state is a 30-minute limit cycle featuring strong and unusual X-ray spectral variability. We report our analysis of two ...

We consider a two-dimensional steady-state, axisymmetric magnetohydrodynamic (MHD) accretion-disk wind as X-ray absorbing outflows, often found in active galactic nuclei (AGNs) and galactic black hole candidates (GBHCs). In this model a fraction of accreting plasma is assumed to be launched from a thin-disk surface with the Keplerian rotational velocity ...

We consider a two-dimensional steady-state, axisymmetric magnetohydrodynamic (MHD) accretion-disk wind as X-ray absorbing outflows, often found in active galactic nuclei (AGNs) and galactic black hole candidates (GBHCs). In this model a fraction of accreting plasma is assumed to be launched from the thin-disk surface with the Keplerian rotational velocity ...

Understanding boundary layer heating is crucial in determining the thermal structure of the accreted envelope of a prenova white dwarf. The matched asymptotic expansion method was used to solve consistently for the structure of accretion disks transferring matter onto rotating white dwarfs. The fraction of ...

Emission-line profiles of several cataclysmic variables have been observed through eclipse, and they do not show strong evidence for the rotational signature that is characteristic of an accretion disk. The lines appear to be formed in material that has some rotation with respect to the white dwarf, but that also has a substantial velocity directed radially with respect to the ...

The spatial and temporal development of protoplanetary accretion disks is investigated. Flat, homogeneous, mixed gas/dust disks with interstellar elementary frequencies, whose motion is estimated by the gravitation field of the central object, are conside...

A two dimensional numerical model forming two spiral shock fronts in accretion flow in close binary star system is presented. The position of these shocks is discussed. In the model, the position of the second shock front depends on the relation between t...

We consider the structure and emission spectra of nonthermal accretion disks around both strongly and weakly magnetized neutron stars. Such disks may be dissipating their gravitational binding energy and transferring their angular momentum via semicontinu...

The IUE was used to study processes connected with accretion disk structure and stability, wind accretion and wind-wind collisions, contact systems, and stellar activity in close binary stars. Time dependent phenomena already known from optical studies ap...

An analytical model calculation of the ionization structure of matter accreting onto a degenerate dwarf was carried out. Self-consistent values of the various parameters are used. The possibility of nuclear burning of the accreting matter is included. We ...

The basic ideas of accretion onto magnetized neutron stars are outlined. These are applied to a simple model of the structure of the plasma mound sitting at the magnetic poles of such a star, in which upward diffusion of photons is balanced by their downw...

LE and ME data from the Exosat Observatory were used to investigate the 283-sec pulse profile of Vela X-1 in its dependence on spin and orbital phase as well as energy. Pulsed emission was found down to the lowest energy measureable (0.7-2 keV). A pulse-phase analysis showed that the normalized pulse profiles are independent of the orbital phase and constant on time scales larger than 4 h. It is ...

We present a wide grid of models for the structure and transmission properties of warm absorbers in active galactic nuclei (AGN). Contrary to commonly used constant density models, our absorbing cloud is assumed to be under constant total (gas plus radiation) pressure. This assumption implies the coexistence of material at different temperatures and ionization states, which is ...

The basic theoretical ideas in the models of regularly pulsating X-ray sources are discussed, and put in relation to the observations. The topics covered include physics of the magnetosphere of an accreting neutron star, hydrodynamics of the accretion column, physical processes close to the surface of the neutron star such as ...

� and energy�dependent opacity of high�energy fl�rays attenuated by pair�production interactions with accretion�flare of the accretion flare to determine the location of the fl�ray emission site, as well as the column density are attenuated by the diffuse intergalactic infrared radiation field (e. g., de Jager, Stecker, ...

star radius, Rn . 3. Calculation of Scattering The scattering of protons by Alfv'en waves depends #12; Figure 2. The spectrum of protons which emerge at the Alfv'en radius after acceleration in the accretion solid angle, dn=d\\Omega for those protons which emerge at the Alfv'en radius. The data is expressed

In the magnetic column of neutron stars ??� mesons may be produced in large number since a accreting material arrives at the atmosphere with characteristic energies of 100�300 MeV per nucleon. More effectively mesons are produced by Coulomb stopping of ? particles of accreting materials with ? particles of atmosphere. In magnetic ...

This abstract introduces newly discovered microbe assemblages within Lake Vostok and the research it has inspired. Current studies hope to gain insight into the following areas: physical stresses in deep glacial and accretion ice; the role of clathrates on gas dynamics within the lake; the origin of microbes in accretion ice; the physiological state of ...

A final report is given of two research projects dealing with magnetic fields of neutron stars. These are the modulation of thermal x-rays from cooling neutron stars and plasma instabilities in neutron star accretion columns. (DWL)

A final report is given of two research projects dealing with magnetic fields of neutron stars. These are the modulation of thermal x-rays from cooling neutron stars and plasma instabilities in neutron star accretion columns. (ERA citation 12:044375)

The continental evolution of eastern North America, especially the Appalachian Geologic Province (1200 Ma to present) preserves a complete geologic record of two successive supercontinent assemblies and dispersals, including evidence for rifting and development of passive margins, accretion of island arcs, ribbon continents, continental and oceanic blocks. High resolution SIMS ...

Results are given for tests on two full-size non-sway structural subassemblages with laterally unsupported columns. All columns were designed with the procedure currently recommended for plastically design structures. The results indicate a substantial po...

... Title : Implications of Fine-Scale Magnetics for the Structure and Evolution of Slowly Accreted Oceanic Crust. Descriptive Note : Final rept. ...

A one-zone model is developed for analysis of properties of nuclear shell flashes on accreting degenerate dwarfs and neutron stars. The model provides a description of a steady-state nuclear burning and a linear stability analysis with a small number of algebraic equations. Time evolution of the accreted layer is described with two first order ordinary ...

, as observations of the dripping and column regimes are available in the technical literature relative to tubular are incompatible in the 1-D array of columns, where a static pattern is always spatially homogeneous. In 1-D indeed distribution of columns is not homogeneous. In some static cases, the number of first neighbors can ...

... end-moments applied to the beam-column. ... beams and beam-columns) was examined ... STEEL, *BEAMS(STRUCTURAL), BEAMS(STRUCTURAL ...

... The beam-column ends were essentially ... of the beam-columns were ASTM ... Descriptors : *STEEL, *BEAMS(STRUCTURAL), BEAMS(STRUCTURAL ...

... a) Describes the general beam-column system considered ... Descriptors : *Structural analysis, Beams(Structural), Columns(Supports), Loads(Forces ...

STRUCTURAL CONFIGURATIONS. The 6-column configuration is shown in Figures 1, 2 and 4. These steel columns are built up sections with two horizontal supports ...

... and tensile loading of columns. Parameters that may affect the response of a column/slab system to blast loading include structural details and the ...

... Eigenvalue Problems from a Nonlinear Structural Analysis. ... example of a fixed-free column loaded both ... of an eigenvalue for very slender columns. ...

Structural Reliability and Risk. NASA/TM2010-216078. January 2010 .... has five columns; the first column has a description of each property; ...

Step by step procedures are described which are used to design structural components (rods, columns,

... Abstract : Step-by-step procedures are described which can be used to design structural components (rods, columns, and beam columns ...

... Title : Column and Plate Compressive Strengths of Aircraft Structural Materials - 24S-T Aluminum-Alloy Sheet. Descriptive Note : Wartime rept. ...

... Title : Column and Plate Compressive Strengths of Aircraft Structural Materials Extruded 14S-T Aluminum Alloy. Descriptive Note : Wartime rept. ...

... calculate creep and stress rupture strength of columns, column systems, plates, shells, pipes, rotating discs, rotors, and other structural elements is ...

... two full-size non-sway structural subassemblages with ... post-buckling strength for unbraced columns in a ... design procedure for this type of column. ...

density of structural defects. These defects lie along the [0001] direction delineating the boundaries of the individual columns. The AIN columns have a ...

... Descriptors : *STRUCTURES, *BLAST, *STEEL, *BEAMS(STRUCTURAL), *COLUMNS(SUPPORTS), *CONCRETE, ACCIDENTS, ASYMMETRY ...

large truss structure to generate an accurate structural model. ... perturbation are calculated and assembled as columns of S where npgap refers to the ...

How are accretion disks in Seyfert Galaxies oriented relative to the disk of the spiral galaxy which hosts them? This angle, ?, serves as a link between the innermost workings of the black hole plus fueling accretion disk and the larger galaxy, either as the memory of the activity-provoking event, or as a diagnostic for the structure ...

We have studied the dependence of the profiles of molecular abundances and line emission on the accretion flow in the hot ($\\ga 100$K) inner region of protoplanetary disks. The gas-phase reactions initiated by evaporation of the ice mantle on dust grains are calculated along the accretion flow. We focus on methanol, a molecule that is formed predominantly ...

On 2010 March 31, MAXI discovered an outburst from LS V +44 17 which is one of the Be/X-ray Binaries (BeXBs). BeXBs consist of a neutron star orbiting around an early-type Be star. This BeXB, LS V +44 17 had not showed any outbursts since 1997 when the source identified as BeXB. After the MAXI discovery, RXTE and Swift observed the source both in three times. Pulse profiles of the outburst ...

In magnetic cataclysmic variables (CVs) the primary is a highly magnetized white dwarf (WD) whose field controls the accretion flow close to the WD, leading to a shock and accretion column that radiate chiefly in X-rays. We present preliminary results from a 500 ks Chandra HETG observation of the brightest magnetic CV EX Hya. From the ...

Mass accretion onto (proto-)stars at high accretion rates M-dot{sub *}> 10{sup -4} M{sub sun} yr{sup -1} is expected in massive star formation. We study the evolution of massive protostars at such high rates by numerically solving the stellar structure equations. In this paper, we examine the evolution via disk ...

The solution for the radial drift velocity of thin disk accretion onto black holes must be transonic, and is analogous to the critical solution in spherical Bondi accretion, except for the presence of angular momentum. The transonic requirement yields a correct treatment of the inner region of the disk not found in the conventional Keplerian models and may ...

The dynamical and radiative consequences of disk accretion onto magnetic T Tauri stars (TTS) are examined using the Ghosh and Lamb model. It is shown that a prolonged disk accretion phase is compatible with the low rotation rates measured in these stars if they possess a kilogauss strength field that disrupts the disk at a distance of a few stellar radii ...

Using potassium silicate as silicon source, formamide as catalyst, a series of silica xerogel monolithic columns with different consistencies were prepared. The column bed would not rupture and collapse during drying at high temperatures. This is the biggest advantage compared with the inorganic monolithic columns using alkoxy silane ...

Subduction accretion and repeated terrane collision shaped the Alaskan convergent margin. The Yakutat Terrane is currently colliding with the continental margin below the central Gulf of Alaska. During the Neogene the terrane's western part was subducted after which a sediment wedge accreted along the northeast Aleutian Trench. This wedge incorporates ...

A solid moderator core structure is designed for gascooled graphite- moderated reactors. The structure comprises an assembly of spaced vertical columns of graphite blocks within a constrained framework. The columns are divided into static columns and dynamic columns ...

A method is proposed for restoring the structure of the accretion disk in a binary system from analysis of eclipse curves. Application of the method to the x-ray binary HZ Herculis yields the distribution of brightness and color temperatures over the optical accretion disk associated with the neutron star. The luminosity, mean ...

... columns . oC9(flange),60ksi ; oCq (web),38ksi . Page 27. TITLE: Column and Plate Compresslve Strengths of Aircraft Structural Materials - Extruded ...

Recently, Ida et al. made an N-body simulation of lunar accretion from a protolunar disk formed by a giant impact. One of their important conclusions is that the accretion time of the Moon is as short as one month. Such rapid accretion is a necessary consequence of the high surface density of a lunar mass disk ...

Observations have cumulatively revealed the presence of blueshifted absorption features from various astrophysical objects hosting central black holes (i.e. Seyferts, quasars, galactic black holes). These are thought to be the result of absorption by specific ionic species of a wind/outflow of relatively high column density in our line of sight (LoS). Chandra/XMM-Newton ...

This paper considers the optimal design of thermally coupled distillation columns and dividing wall columns using detailed column models and mathematical optimization. The column model used is capable of describing both conventional and thermally coupled columns, which allows comparisons of ...

A simplified model of the vertical structure of accretion disks is derived. Analytical expressions for the temperature and density structure, which represent a generalization of the gray model long known in the theory of classical stellar atmospheres, are presented. The formalism naturally explains similarities and differences between ...

Recent high spectral resolution X-ray observations of some CTTSs show the presence of high density plasma (ne=10^{11}-10^{13} cm^{-3}) at temperature T=2-3 MK. This plasma is likely heated up by an accretion shock on the star surface. We investigate this issue by an accurate modelling of the impact of an accretion stream onto the stellar chromosphere. ...

Young T Tauri stars exhibit strong solar-type magnetic activity, with extremely high temperature coronae and energetic flares. In a few systems discovered with Chandra and XMM-Newton there is also evidence for X-ray emission produced by shocks associated with magnetically channeled accretion. A recent 489 ksec Chandra HETG/ACIS-S observation of the classical T Tauri star TW ...

We examine the effect of magnetic fields on star cluster formation by performing simulations following the self-gravitating collapse of a turbulent molecular cloud to form stars in ideal MHD. The collapse of the cloud is computed for global mass-to-flux ratios of infinity, 20, 10, 5 and 3, that is using both weak and strong magnetic fields. Whilst even at very low strengths the magnetic field is ...

We propose to address two of the biggest open questions in galaxy formation - how galaxies acquire their gas and how they return it to the IGM - with a concentrated COS survey of diffuse multiphase gas in the halos of SDSS galaxies at z = 0.15 - 0.35. Our chief science goal is to establish a basic set of observational facts about the physical state, metallicity, and kinematics of halo gas, ...

We discuss the dynamics of the accretion flow onto a black hole driven by Poynting flux in a simplified model of a two-dimensional accretion disk. In this simplified model, the condition of the stationary accretion flow is found to impose a nontrivial constraint on the magnetic field configuration. The effect of the magnetic field on ...

We investigate further a model of the accreting millisecond X-ray pulsars we proposed earlier. In this model, the X-ray-emitting regions of these pulsars are near their spin axes but move. This is to be expected if the magnetic poles of these stars are close to their spin axes, so that accreting gas is channeled there. As the accretion ...

An experimental and theoretical study of three different passive damping concepts is conducted for a