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Viser treff 11-17 av 17
Optical water types of the Nordic Seas and adjacent areas
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-05-20)
A new map of Jerlov's optical water types in the Nordic Seas and adjacent waters at 139 locations, as well as a table with statistical and geographical properties of the vertical attenuation coefficient of downward irradiance at 475 nm, are presented. The data analysis is based on 715 recordings at different stations, at latitudes between 54° and 82°N, and longitudes between 31°W and 49°E, obtained ...
Local refinement of ERBS curves
(Journal article; Peer reviewed; Chapter, 2013-12-31)
Expo-rational B-splines (ERBS) provide a blending type construction where local functions at each knot are blended together by infinitely smooth basis functions. In this work we consider some specific ERBS curves that are approximations of parametric curves. We study local refinement to increase flexibility by inserting local control curves at points of interest on the ERBS curve. Inserting knots ...
Control of Spacecraft Formation with Disturbance Rejection and Exponential Gains
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
We address the problem of state feedback translational motion control of a spacecraft formation through a modified sliding surface controller using variable gains and I^2 action for disturbance rejection. The exponential varying gains ensure faster convergence of the state trajectories during attitude maneuver while keeping the gains small (and the system less stiff) for station keeping. Integral ...
Deployment of a Neo-Hookean membrane: experimental and numerical analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-03-31)
The aim of this research is to assess the response of a thin membrane subjected to high-pressure gas loading for inflation. This procedure is applied during the design process of the membrane structure to allow the product to resist high-pressure loading and to further characterize the hyper-elastic material. The simulation in this work considers the standard procedures used in the LS-DYNA software, ...
Some new iterated Hardy-type inequalities: the case theta=1
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013-11-08)
In this paper we characterize the validity of the Hardy-type inequality ∥ ∥ ∫ <sub>s</sub>∞) h(z)dz ∥ p,u,(0,t) ∥ q,w,(=,∞≤ c∥h∥ 1,v(0,∞) where 0 < p < ∞,0< q ≤ +∞, u, w and v are weight functions on (0,∞). It is pointed
out that this characterization can be used to obtain new characterizations for the
boundedness between weighted Lebesgue spaces ...
Atmospheric Icing Sensors - Capacitive Techniques
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2013-01-22)
The application of capacitive sensing technique is widely distributed in different physical domains primarily because of the diversity in dielectric permittivity and due to its minimum loading error and inertial effects. Atmospheric ice is a complex mixture of water, ice and air which is reflected in its complex dielectric constant. There are many existing atmospheric icing sensors but only few are ...
Simulation of Robotic Tasks with VALIP System - Practical Application
(Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
In manufacturing engineering, man-machine interaction has gone from typical online programming techniques into virtual reality based offline programming methodologies. Today, a wide range of offline software tools is used to imitate, simulate and control real manufacturing systems. However, these new methodologies lack capability when it comes to human-machine communication. This paper aims to ...