Current Issue : October - December Volume : 2019 Issue Number : 4 Articles : 5 Articles
This paper illustrates a methodology to get a reliable estimation of the local wave properties,\nbased on the reconstruction of the motion of a moving sailboat by means of GNSS receivers installed\non board and an original kinematic positioning approach. The wave parameters reconstruction\nmay be used for many useful practical purposes, e.g. to improve of autopilots, for real-time control\nsystems of ships, to analyze and improve the performance of race sailboats, and to estimate the local\nproperties of the waves. A Class 40 oceanic vessel (ECO40) left from the port of â??Riva di Traianoâ?\nlocated close to Rome (Italy) on 19 October 2014 to perform a non-stop sailing alone around the world\nin energy and food self-sufficiency. The proposed system was installed on ECO40 and the proposed\nmethod was applied to estimate the wave properties during a storm in theWestern Mediterranean\nSea. The results compared against two sets of hindcast data and wave buoy records demonstrated\nthe reliability of the method....
The Deep Space Network (DSN) is a worldwide array of radio telescopeswhich supportsNASAâ??s interplanetary spacecraftmissions.\nWhen the DSN antennas are not communicating with spacecraft, they provide a valuable resource for performing observations of\nradio magnetars, searches for new pulsars at the Galactic Center, and additional pulsar-related studies. We describe the DSNâ??s\ncapabilities for carrying out these types of observations.We also present results from observations of three radio magnetars, PSR\nJ1745-2900, PSR J1622-4950, and XTE J1810-197, and the transitional magnetar candidate, PSR J1119-6127, using the DSN radio\ntelescopes near Canberra, Australia....
The CubeSat DTUsat-2 was designed and built by students and faculty at the Technical University of Denmark and launched to\nlow earth orbit on June 2014. Its mission was to aid ornithologists in bird migration research. Shortly after launch and orbit\ninjection, it became apparent that all was not nominal. To understand the problem and find the causes, a forensic\ninvestigation was initiated. The investigation used recorded Morse-encoded beacons emitted by the satellite as a starting point.\nThis paper presents the real-life data from DTUsat-2 on orbit and the methodologies used to visualize the key element in the\ninvestigation, namely, the correlation between orbit position and the beacon counter. Based on the data presented, an\nexplanation for the observed behaviour of DTUsat-2 is given....
In the present study, five-year of precipitation features (PFs) datasets, based on Global Precipitation Measurement (GPM), are used\nto investigate the global and regional characteristics of extreme rainfall events (EREs). )e EREs are defined based on the PFs area,\ndepth (maximum height of radar reflectivity), and the rain rate and called them largest, deepest, and intense EREs, respectively.)e\nEREs are divided into top 10%, 1%, 0.1%, and 0.01% based on their frequency of occurrences. It is observed that occurrences of\nEREs belonging to less than top 0.01% EREs follow the tropical rainfall climatology over the tropics based on all the parameters.\nSubtropical oceanic areas consist of a higher frequency of largest EREs, whereas tropical land areas consist of the higher number of\ndeepest EREs. )e most intense EREs (top 0.01%) are uniformly distributed over tropical areas and subtropical oceans, and spatial\ndistribution shows that a deepest ERE belongs to intense EREs in the tropical land areas. .........................
This paper presents a novel weather-routing system based on a multi-criteria setup.\nThe set of 3 conflicting criteria is: travel time, ship navigation added resistance (caused by wind\nand waves), and navigation risk/safety. To this aim, the International Maritime Organization\n(IMO) safety guidelines are exploited for the design of navigation risk criterion as a function of the\nMETeorological and OCeanographic (METOC) and sailing conditions. This risk is directly integrated\ninto the multi-criteria setup, as an innovative alternative to the systems proposed in the open\nliterature. The proposed methodology is tested in a real operational scenario in the Mediterranean\nSea. The obtained results show how the proposed system provides alternative routes with minimum\nrisk to the decision-makers, as well as other different alternative routes minimizing the other criteria....
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