نتایج جستجو برای: cluster mission
تعداد نتایج: 236039 فیلتر نتایج به سال:
X-Ray Polarimetry can be now performed by using a Micro Pattern Gas Chamber in the focus of a telescope. It requires large area optics for most important scientific targets. But since the technique is additive a dedicated mission with a cluster of small telescopes can perform many important measurements and bridge the 40 year gap between OSO-8 data and future big telescopes such as XEUS. POLARI...
Receding Horizon based Cooperative Vehicle Control with Optimal Task Allocation Mohammad Khosravi The problem of cooperative multi-target interception in an uncertain environment is investigated in this thesis. The targets arrive in the mission space sequentially at a priori unknown time instants and a priori unknown locations, and then move on a priori unknown trajectories. A group of vehicles...
The Applied Remote Sensing Cluster of the German Aerospace Center (DLR) is responsible for the establishment of the payload ground segment for the future German hyperspectral satellite mission EnMAP (Environmental Mapping and Analysis Program), which is planned to be launched in 2012. EnMAP covers the spectrum from 420 nm to 2450 nm with a spectral resolution of at least 10 nm and a spatial res...
We have developed an architecture called MUSE (MultiUser Scheduling Environment) to enable the integration of multiobjective evolutionary algorithms with existing domain planning and scheduling tools. Our approach is intended to make it possible to re-use existing software, while obtaining the advantages of multi-objective optimization algorithms. This approach enables multiple participants to ...
We introduce a technique to determine instantaneous local properties of waves based on discrete-time sampled, real-valued measurements from 4 or more spatial points. The technique is a generalisation to the spatial domain of the notion of instantaneous frequency used in signal processing. The quantities derived by our technique are closely related to those used in geometrical optics, namely the...
Cluster is a multi-spacecraft ESA mission launched in 2000 to study the Earth's magnetic environment. After more than 11 years in space, the performance of the batteries and the solar arrays has decreased dramatically limiting the available power on-board. This is becoming a serious problem for contingency situations because hard-coded sequences executed during safe modes require much more powe...
Solar sails have been studied in the past as an alternative means of propulsion for spacecraft. Recent advances in solar sail technology and the miniaturisation of technology can drive these systems much smaller (< 5 kg mass, < 10 m sail diameter) than existing sails, while still having a high delta-V and acceleration capability. With these unique capabilities of miniature solar sails, called s...
The Kepler Mission began its 3.5 year photometric monitoring campaign in 2009 May on a select group of approximately 150,000 stars. The stars were chosen from the ∼ half million in the field of view that are brighter than 16th magnitude. The selection criteria are quantitative metrics designed to optimize the scientific yield of the mission with regard to the detection of Earth-size planets in ...
what features and advantages does the prophet have which distinguish him from others? to answer this question, the writer names three approaches: 1. epistemical approach, 2. responsibility approach, and 3, situational approach. in the first approach, he examines various viewpoints which all view divine knowledge (ma‘rifat) as the prophet's distinctive feature. in the second approach, the s...
A number of modes of oscillations of particles and fields can exist in space plasmas. Since the early 1970s, space missions have observed noise-like plasma waves near the geomagnetic equator known as 'equatorial noise'. Several theories were suggested, but clear observational evidence supported by realistic modelling has not been provided. Here we report on observations by the Cluster mission t...
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