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तनाव — tension
There’s maybe just enough time to write this note before the English loanword !"शन completely
ousts the fine word तनाव from Hindi usage! The two words are in fact related to each other,
which may account for the…er…tension between them.Asian Studie
Tension is Dimension
We propose a simple universal formula for the tension of a D-brane in terms
of a regularized dimension of the associated conformal field theory statespace.Comment: 18 pages, harvmac (b), one ref added, one typo fixe
Progressive damage in stitched composites: Static tensile tests and tension-tension fatigue
The paper describes progressive damage in static tensile tests and tension-tension fatigue in structurally stitched carbon/epoxy NCF composites, in comparison with their non-stitched counterparts. Analogies between damage development in quasi-static tension and tension-tension fatigue are analyzed and links between the damage initiation thresholds in quasi-static tests and fatigue life are established
Fatigue Damage in Notched Composite Laminates Under Tension-Tension Cyclic Loads
The results are given of an investigation to determine the damage states which develop in graphite epoxy laminates with center holes due to tension-tension cyclic loads, to determine the influence of stacking sequence on the initiation and interaction of damage modes and the process of damage development, and to establish the relationships between the damage states and the strength, stiffness, and life of the laminates. Two quasi-isotropic laminates were selected to give different distributions of interlaminar stresses around the hole. The laminates were tested under cyclic loads (R=0.1, 10 Hz) at maximum stresses ranging between 60 and 95 percent of the notched tensile strength
Visible Branes with Negative Tension in Heterotic M-Theory
It is shown that there exist large classes of BPS vacua in heterotic M-theory
which have negative tension on the visible orbifold plane, positive tension on
the hidden plane and positive tension, physical five-branes in the bulk space.
Explicit examples of such vacua are presented. Furthermore, it is demonstrated
that the ratio, beta/|alpha|, of the bulk five-brane tension to the visible
plane tension can, for several large classes of such vacua, be made arbitrarily
small. Hence, it is straightforward to find vacua with the properties required
in the examples of the Ekpyrotic theory of cosmology - a visible brane with
negative tension and beta/|alpha| small. This contradicts recent claims in the
literature.Comment: 30 page
Bouncing Negative-Tension Branes
Braneworlds, understood here as double domain wall spacetimes, can be
described in terms of a linear harmonic function, with kinks at the locations
of the boundary branes. In a dynamical setting, there is therefore the risk
that the boundary brane of negative tension, at whose location the value of the
harmonic function is always lowest, can encounter a zero of this harmonic
function, corresponding to the formation of a singularity. We show that for
certain types of brane-bound matter this singularity can be avoided, and the
negative-tension brane can shield the bulk spacetime from the singularity by
bouncing back smoothly before reaching the singularity. In our analysis we
compare the 5- and 4-dimensional descriptions of this phenomenon in order to
determine the validity of the moduli space approximation.Comment: 20 pages, 1 figure, discussion extended and references added; minor
mistake correcte
Random RNA under tension
The Laessig-Wiese (LW) field theory for the freezing transition of random RNA
secondary structures is generalized to the situation of an external force. We
find a second-order phase transition at a critical applied force f = f_c. For f
f_c, the extension L as a function of
pulling force f scales as (f-f_c)^(1/gamma-1). The exponent gamma is calculated
in an epsilon-expansion: At 1-loop order gamma = epsilon/2 = 1/2, equivalent to
the disorder-free case. 2-loop results yielding gamma = 0.6 are briefly
mentioned. Using a locking argument, we speculate that this result extends to
the strong-disorder phase.Comment: 6 pages, 10 figures. v2: corrected typos, discussion on locking
argument improve
Phase-locked scroll waves defy turbulence induced by negative filament tension
Scroll waves in a three-dimensional media may develop into turbulence due to negative tension of the filament. Such negative tension-induced instability of scrollwaves has been observed in the Belousov-Zhabotinsky reaction systems. Here we propose a method to restabilize scroll wave turbulence caused by negative tension in three-dimensional chemical excitable media using a circularly polarized (rotating) external field. The stabilization mechanism is analyzed in terms of phase-locking caused by the external field, which makes the effective filament tension positive. The phase-locked scrollwaves that have positive tension and higher frequency defy the turbulence and finally restore order. A linear theory for the change of filament tension caused by a generic rotating external field is presented and its predictions closely agree with numerical simulations
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