Results 21 to 30 of about 312,874 (254)

Semi-blind sparse channel estimation with constant modulus symbols [PDF]

open access: yes, 2005
We propose two methods for the estimation of sparse communication channels. In the first method, we consider the problem of channel estimation based on training symbols, and formulate it as an optimization problem.
Cetin, Mujdat   +2 more
core   +1 more source

Analysis of nanoindentation of soft materials with an atomic force microscope [PDF]

open access: yes, 2011
Nanoindentation is a popular experimental technique for characterization of the mechanical properties of soft and biological materials. With its force resolution of tens of pico-Newtons, the atomic force microscope (AFM) is well-suited for performing ...
Notbohm, Jacob   +2 more
core   +1 more source

Numerical study of shock formation in the dispersionless Kadomtsev-Petviashvili equation and dispersive regularizations [PDF]

open access: yes, 2013
The formation of singularities in solutions to the dispersionless Kadomtsev-Petviashvili (dKP) equation is studied numerically for different classes of initial data.
Klein, Christian, Roidot, Kristelle
core   +1 more source

Dispersion of carbon nanotubes in polypropylene via multilayer coextrusion: Influence on the mechanical properties [PDF]

open access: yes, 2013
The authors would like to thank PSA for funding this research and providing some of the materials used in this study. We also would like to thank R. Glénat, P. Soria, E. Dandeu, A. Grand- montagne and A.
DELALANDE, S   +4 more
core   +6 more sources

Least Squares Method and Least Modules Method for Finding Defects in Regular Images

open access: yesКібернетика та комп'ютерні технології
The article describes methods based on method of least squares (LSM) and the method of least modules (LMM) to search for defects in regular images (regular 3D structures images).
Volodymyr Zhydkov   +2 more
doaj   +1 more source

Piezoelectric-based apparatus for strain tuning [PDF]

open access: yes, 2014
We report the design and construction of piezoelectric-based apparatus for applying continuously tuneable compressive and tensile strains to test samples. It can be used across a wide temperature range, including cryogenic temperatures.
Andrew P. Mackenzie   +5 more
core   +2 more sources

An Automated Optical Strain Measurement System for Estimating Polymer Degradation under Fatigue Testing

open access: yesSensors, 2022
(1) Background: this study deals with design of an automated laboratory facility based on a servo-hydraulic testing machine for estimating parameters of mechanical hysteresis loops by means of the digital image correlation (DIC) method.
Alexey A. Bogdanov   +5 more
doaj   +1 more source

Analysis of a typical railway turnout sleeper system using grillage beam analogy [PDF]

open access: yes, 2012
A simplified grillage beam analogy was performed to investigate the behaviour of railway turnout sleeper system with a low value of elastic modulus on different support moduli.
Aravinthan, Thiru   +3 more
core   +1 more source

Large Magellanic Cloud Distance from Cepheid Variables using Least Squares Solutions

open access: yes, 2007
Distance to the Large Magellanic Cloud (LMC) is determined using the Cepheid variables in the LMC. We combine the individual LMC Cepheid distances obtained from the infrared surface brightness method and a dataset with a large number of LMC Cepheids ...
A. Sandage   +5 more
core   +1 more source

Structural relaxation in silicate melts and non-Newtonian melt rheology in geologic processes [PDF]

open access: yes, 1989
The timescale of structural relaxation in a silicate melt defines the transition from liquid (relaxed) to glassy (unrelaxed) behavior. Structural relaxation in silicate melts can be described by a relaxation time, , consistent with the observation that ...
Dingwell, Donald B., Webb, Sharon L.
core   +1 more source

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