7,458 research outputs found
The stability of an air-maintained cavity behind a stationary object in flowing water
In studies made in the Free Surface Water Tunnel of a projectile running in an air-maintained cavity, the experimental relation between air entrainment rate and cavitation number was determined. The entrainment-rate coefficient CQ = Q/V0d^2, where Q is the air rate in cfs, V0 the free-stream velocity, and d the disk nose diameter, was plotted against cavitation parameter, K = (p0 - pk)/q0 where p0 is the free-stream pressure at the disk center line, pk the cavity pressure, and q0 the free-stream dynamic pressure. This experimental relationship for one single disc is shown for three different velocities in Fig. 1. The curves are similar in shape and each has a minimum value of entrainment coefficient which is designated by CQ^* at a value of K as designated as K^*
Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC 4395. IV. The Variable UV Absorption Lines
We report the detection of variable UV absorption lines in NGC 4395, based on
UV observations with the HST STIS carried out in April and July, 2004, as part
of a reverberation-mapping campaign. Low-ionization lines of O I, N I, Si II, C
II, and Fe II, are present in the low-state spectra (April 2004) at a velocity
v_shift=-250 km/s (system A_l), and additional high-ionization lines of C IV
and N V appear in the high-state spectra (July 2004) at v_shift=-250 km/s
(system A_h) and at v_shift=-840 km/s (system B). The absence of absorption
from the low metastable levels of Si II implies a density <~10^3 cm^(-3) for
system A_l, indicating a location outside the narrow line region (NLR). System
A_h is peculiar as only N V absorption is clearly detected. A high N V/C IV
absorption ratio is expected for a high metallicity absorber, but this is
excluded here as the metallicity of the host galaxy and of the nuclear gas is
significantly subsolar. A simple acceptable model for systems A_h and B is an
absorber located between the broad line region (BLR) and the NLR, which absorbs
only the continuum and the BLR. At the low-state the strong narrow emission
lines of C IV and N V dominate the spectrum, making the absorption invisible.
At the high-state the absorbed continuum and BLR emission dominate the
spectrum. Thus, the change in the observed absorption does not reflect a change
in the absorber, but rather a change in the continuum and BLR emission from
behind the absorber, relative to the emission from the NLR in front of the
absorber. Studies of the absorption line variability in highly variable objects
can thus break the degeneracy in the absorber distance determination inherent
to single epoch studies.Comment: Accepted for publication in The Astrophysical Journa
Superorbital Period in the High Mass X-ray Binary 2S 0114+650
We report the detection of a superorbital period in the high-mass X-ray
binary 2S 0114+650. Analyses of data from the Rossi X-ray Timing Explorer
(RXTE) All-Sky Monitor (ASM) from 1996 January 5 to 2004 August 25 reveal a
superorbital period of 30.7 +/- 0.1 d, in addition to confirming the previously
reported neutron star spin period of 2.7 h and the binary orbital period of
11.6 d. It is unclear if the superorbital period can be ascribed to the
precession of a warped accretion disc in the system.Comment: 5 pages, 5 figures, submitted to MNRAS 27th January 2005. Manuscript
expanded to include discussion of evolution of periods, and hardness ratio
variability. Number of figures increased from 5 to 9. Accepted for
publication 19th December 200
Topological Properties from Einstein's Equations?
In this work we propose a new procedure for to extract global information of
a space-time. We considered a space-time immersed in a higher dimensional space
and we formulate the equations of Einstein through of the Frobenius conditions
to immersion. Through of an algorithm and the implementation into algebraic
computing system we calculate normal vectors from the immersion to find out the
second fundamental form. We make a application for space-time with spherical
symmetry and static. We solve the equations of Einstein to the vacuum and we
obtain space-times with different topologies.Comment: 7 pages, accepted for publication in Int. J. Mod. Phys.
Embedding Versus Immersion in General Relativity
We briefly discuss the concepts of immersion and embedding of space-times in
higher-dimensional spaces. We revisit the classical work by Kasner in which he
constructs a model of immersion of the Schwarzschild exterior solution into a
six-dimensional pseudo-Euclidean manifold. We show that, from a physical point
of view, this model is not entirely satisfactory since the causal structure of
the immersed space-time is not preserved by the immersion.Comment: 5 page
Electron correlation in Hookeâs law atom in the high-density limit
Closed-form expressions for the first three terms in the perturbation expansion of the exact energy and Hartree-Fock energy of the lowest singlet and triplet states of the Hooke's law atom are found. These yield elementary formulas for the exact correlation energies (-49.7028 and -5.807 65 mE(h)) of the two states in the high-density limit and lead to a pair of necessary conditions on the exact correlation kernel G(w) in Hartree-Fock-Wigner theory.The authors also thank Professor John D. Morgan
III for advice concerning Eq. s1d and both EPSRC sGrant
No. GR/R81121d and the Research School of Chemistry at
ANU for funding
A Multicoloured View of 2S 0114+650
We report the results of radio and X-ray observations of the high mass X-ray
binary 2S 0114+650, made with the Giant Meterwave Radio Telescope and the Rossi
X-ray Timing Explorer respectively. No emission was detected at radio
wavelengths. The neutral hydrogen column density was found to vary over the
orbital period, while no variability over the the super-orbital period was
observed. We discuss the causes of the observed relationships and the
implications for the underlying mechanisms.Comment: 4 pages, 2 figures; to appear in proceedings for "The multicoloured
landscape of compact objects and their explosive progenitors", Cefalu,
Sicily, 2006 June 11-24, AIP, submitte
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