11,336 research outputs found
Analytical and Experimental Determination of FML Stiffness and Strength Properties.
The paper presents application of analytical methods of determining the mechanical
properties of Fibre Metal Laminates. Chosen micromechanical methods were employed
to predict elastic moduli and strength of FML panels. Prediction was conducted on
two levels i.e. micromechanics where properties of a single composite lamina (prepreg)
were analyzed, and macro–mechanics to determine properties of a full FML hybrid material.
The properties of a single GFR lamina were predicted by Rule of Mixture Method
(ROM), inverse Rule of Mixture Method with correction factor, Halpin Tsai Method,
Tsai Method and Wilczynski Method application. Properties of full 3–2 FML lay–up
were determined using the Rule of Mixtures. Analytical results were verified by experimental
tests. Tensile and bending test were performed on rectangular standard coupons
of 3–2 FMLs
Emerging -Anomaly from Tree-Level Determinations of and the Angle
We point out that the recently increased value of the angle in the
Unitarity Triangle (UT), determined in tree-level decays to be
by the LHCb collaboration, combined with
the most recent value of implies an enhancement of
over the data in the ballpark of . This is roughly by a factor of two
larger than the enhancement of that is independent of .
This disparity of enhancements is problematic for models with Constrained
Minimal Flavour Violation (CMFV) and also for models. In view of the
prospects of measuring with the precision of by Belle II
and LHCb in the coming years, we propose to use the angles and
together with and as the fundamental parameters of the
CKM matrix until from tree-level decays will be known precisely.
Displaying as functions of clearly demonstrates the
tension between the value of from tree-level decays, free from new
physics (NP) contributions, and calculated in CMFV and
models and thus exhibits the presence of NP contributions to beyond these frameworks. We calculate the values of and
as functions of and and discuss the implications
of our results for and rare and decays. We also briefly
discuss a future strategy in which , possibly affected by NP, is
replaced by .Comment: 15 pages, 8 figures, 3 tables. v2: Clarifying comments and one figure
added, conclusions unchanged. Matches published versio
The chemical compatibility of thermoplastic hose used in umbilicals
The effects of solvents and temperature on thermoplastic hose for umbilical service are reported in this paper. Accelerated ageing tests were undertaken and analysed by gravimetric, mechanical and calorimetric measurements. Water and methanol were found to cause physical degradation of the polymer, mainly at high temperatures, whereas xylene caused chemical degradation, which increased with increasing temperature. The activation energy for the alpha-process within polyethylene (PE) was found to be 96.3 kJ mol(-1) for un-aged PE and increased to 106.2 kJ moll after 64 days of ageing in water at 100degreesC. The changes in activation energy will be used to make a life-time prediction of umbilical line
FCNC Processes in the Littlest Higgs Model with T-Parity: an Update
We update our 2006-2007 results for FCNC processes in the Littlest Higgs
model with T-parity (LHT). The removal of the logarithmic UV cutoff dependence
in our previous results through a new contribution to the Z^0-penguin diagrams
identified by Goto et al. and del Aguila et al., while making the deviations
from the SM expectations in the quark sector less spectacular, still allows for
sizable new physics effects in K -> pi nu anti-nu and K_L -> pi^0 l^+ l^-
decays and in the CP-asymmetry S_{psi phi} with the latter unaffected by the
new contribution. We extend our analysis by a study of the fine-tuning required
to fit the data on epsilon_K and by the inclusion of the decay K_L -> mu^+
mu^-. A number of correlations can distinguish this model from the custodially
protected Randall-Sundrum model analysed recently. We also reconsider lepton
flavour violating decays, including now a discussion of fine-tuning. While the
l_i -> l_j gamma decays are unaffected by the removal of the logarithmic cutoff
dependence, the branching ratios for decays with three leptons in the final
state, like mu -> 3 e are lowered by almost an order of magnitude. In spite of
this, the pattern of lepton flavour violation in the LHT model can still be
distinguished from the one in supersymmetric models.Comment: 30 pages, 14 figures, 5 tables. Clarifying comments added, matches
published versio
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