6,415 research outputs found
Construction of a VC1 interpolant over triangles via edge deletion
We present a construction of a visually smooth surface which interpolates to position values and normal vectors of randomly distributed points on a 3D object. The method is local and uses quartic triangular and bicubic quadrilateral patches without splits. It heavily relies on an edge deleting algorithm which, starting from a given triangulation, derives a suitable combination of three- and four sided patches
Global fits in the Georgi-Machacek model
Off the beaten track of scalar singlet and doublet extensions of the Standard
Model, triplets combine an interesting LHC phenomenology with an explanation
for neutrino masses. The Georgi-Machacek model falls into this category, but it
has never been fully explored in a global fit. We use the {\texttt{HEPfit}}
package to combine recent experimental Higgs data with theoretical constraints
and obtain strong limits on the mixing angles and mass differences between the
heavy new scalars as well as their decay widths. We also find that the current
signal strength measurements allow for a Higgs to vector boson coupling with an
opposite sign to the Standard Model, but this possibility can be ruled out by
the lack of direct evidence for heavy Higgs states. For these hypothetical
particles, we identify the dominant decay channels and extract bounds on their
branching ratios from the global fit, which can be used to single out the decay
patterns relevant for the experimental searches.Comment: 23 pages, 4 figures. In v2: 30 pages, 6 figures. Updated Higgs
experimental data. Global fits updated. Major conclusions unchanged. In v3:
28 pages, 6 figures. Comments on other searches included in summary. Version
accepted for publication in PR
Optimisation of the Wax and Oil Phases in a Conventional Lipstick Using Mixture Design
Lipstick is essentially a mixture of oils, waxes and pastes. The type and ratio of ingredients in the lipstick base determine the type and intensity of interactions, which directly affect the quality of lipstick. Fundamentally, a lipstick must have sufficient stick strength to withstand the force during application, but it should also have appropriate ‘pay off’ characteristics. The traditional empirical approach may be inefficient in the development of lipsticks, because of the number of formulation variables and the two competing requirements.
The results of this study have revealed the quantitative relationship between the hardness of a lipstick (expressed as its breaking and softening point) and its ‘glide’ performance. The use of the Mixture Design approach has made it possible to effectively select the samples with the best overall characteristics, on the basis of limited but focused experimental work
The effect of thickeners and performance-enhancing powders on the application characteristics of mascara
Slippage of water past superhydrophobic carbon nanotube forests in microchannels
We present in this letter an experimental characterization of liquid flow
slippage over superhydrophobic surfaces made of carbon nanotube forests,
incorporated in microchannels. We make use of a micro-PIV (Particule Image
Velocimetry) technique to achieve the submicrometric resolution on the flow
profile necessary for accurate measurement of the surface hydrodynamic
properties. We demonstrate boundary slippage on the Cassie superhydrophobic
state, associated with slip lengths of a few microns, while a vanishing slip
length is found in the Wenzel state, when the liquid impregnates the surface.
Varying the lateral roughness scale L of our carbon nanotube forest-based
superhydrophobic surfaces, we demonstrate that the slip length varies linearly
with L in line with theoretical predictions for slippage on patterned surfaces.Comment: under revie
Effect of Patterned Slip on Micro and Nanofluidic Flows
We consider the flow of a Newtonian fluid in a nano or microchannel with
walls that have patterned variations in slip length. We formulate a set of
equations to describe the effects on an incompressible Newtonian flow of small
variations in slip, and solve these equations for slow flows. We test these
equations using molecular dynamics simulations of flow between two walls which
have patterned variations in wettability. Good qualitative agreement and a
reasonable degree of quantitative agreement is found between the theory and the
molecular dynamics simulations. The results of both analyses show that
patterned wettability can be used to induce complex variations in flow. Finally
we discuss the implications of our results for the design of microfluidic
mixers using slip.Comment: 13 pages, 12 figures, final version for publicatio
Non-diagonal Charged Lepton Yukawa Matrix: Effects on Neutrino Mixing in Supersymmetry
Generally the diagonalization of the mass matrix of the charged leptons is a
part of the neutrino UPMNS matrix. However, usually this contribution is
ignored by assuming a diagonal mass matrix for charged leptons. In this letter
we test this common assumption in the context of neutrino physics. Our
analytical and numerical results for two supersymmetric models reveal that such
a simplification is not justified. Especially for the solar and reactor mixing
angles important modifications are found.Comment: 22 pages 8 figure
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