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To Measure Relative Permittivity of Atmospheric Ice Using Frequency Sweep
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-31)
The use of AD59333 IC for detecting atmospheric ice and atmospheric ice type was evaluated in this
article. A prototype circuit was developed and was tested using a frequency sweep from 40 Hz to 20 kHz. The IC
was calibrated using 100 kΩ resistor. The real and imaginary components of discrete Fourier transform were
recorded at each frequency increment in order calculate the gain factor at each ...
State of the Art Review of Atmospheric Icing Sensors
(Journal article; Peer reviewed; Tidsskriftartikkel, 2016-03-31)
A state of the art review of atmospheric icing sensors is presented in this article, in order to
understand their design and working principle for future developments. It is found that most atmospheric icing
sensors which are capable of delivering maximum information are based upon direct measurement of the
physical properties (electrical or mechanical) of atmospheric ice. Some field measurements ...
Review of marine icing and anti-/de-icing systems
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-17)
The aim of this work is to review the phenomenon of icing in marine operations. The focus is on two main sources of icing, namely atmospheric and sea spray. The literature reveals that sea spray icing is the main contributor to marine icing. This work discusses the available ice accretion prediction models on ships and offshore structures. It also reviews the anti-/de-icing technologies that can be ...
A stochastic programming approach with improved multi-criteria scenario-based solution method for sustainable reverse logistics design of Waste electrical and electronic equipment (WEEE)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-17)
Today, the increased public concern for sustainable development and more stringent environmental regulations have become the most important driving forces for value recovery from end-of-life and end-of use products through reverse logistics. Waste electrical and electronic equipment (WEEE) contains both valuable components that need to be recycled and hazardous substances that have to be properly ...
An improved multi-objective programming with augmented ε-constraint method for hazardous waste location-routing problem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-31)
Hazardous waste location-routing problems are of importance due to the potential risk for nearby residents and the environment. In this paper, an improved mathematical formulation is developed based upon a multi-objective mixed integer programming approach. The model aims at assisting decision makers in selecting locations for different facilities including treatment plants, recycling plants and ...
Modeling Bottom-Up Visual Attention Using Dihedral Group D4
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08-15)
In this paper, first, we briefly describe the dihedral group D4 that serves as the basis for
calculating saliency in our proposed model. Second, our saliency model makes two major changes in
a latest state-of-the-art model known as group-based asymmetry. First, based on the properties of
the dihedral group D4, we simplify the asymmetry calculations associated with the measurement
of saliency. ...
A Decoupled Approach for Flight Control
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016)
A decoupling method for flight control is presented that greatly simplifies the controller design. By approximating the higher order derivatives of the angle of attack and sideslip, it enables a rotation controller and a speed controller to be derived independently of each other, and thus gives access to a vast number of controller solutions derived for general classes of rotational and translational ...
Numerical study of atmospheric ice accretion on rotating geometric cross sections with fins
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-12)
This paper describes the numerical study of atmospheric ice accretion on rotating geometric cross sections,
circular,
hexagon and square
, all having fins, to select an optimum geometric cross section for use as a rotating part of a newly-
proposed designed icing sensor. Computational fluid dynamics-based numerical analyses were carried out in this research
work to understand and analyse the ...
Multiphysics based Numerical Study of Atmospheric Ice Accretion on a Full Scale Horizontal Axis Wind Turbine Blade
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08)
Atmospheric icing on wind turbines have been recognized as a hindrance
to the development of the wind power in cold regions, where uncertainty
surrounding the effects of icing on energy production may prevent
otherwise good wind resources from being utilized. This research paper is
focused on to numerically simulate the rate and shape of atmospheric ice
accretion on a full-scale horizontal axis ...
Subsumption architecture applied to flight control using composite rotations
(Peer reviewed; Tidsskriftartikkel; Journal article, 2016-03-19)
In this paper the subsumption theory is applied to flight control through composite rotations where multiple tasks can be defined as simple rotations. The tasks can then be arranged as a hierarchy, where the primary task is always fully pursued, and conflicting lower level tasks are removed by the primary rotation. The concept is applied to a group of uavs that move through an urban terrain while ...