نتایج جستجو برای: sail craft
تعداد نتایج: 6035 فیلتر نتایج به سال:
This paper presents results from a Computational Fluid Dynamics (CFD) based parametric design study of two-dimensional downwind sail sections. By varying draft and camber a range of sail shapes are generated that cover the typical range of an America’s Cup Class (ACC) downwind sail inventory. In order to reduce simulation times only a solitary downwind sail is used, i.e., the influence of the m...
An assessment is presented of a Solar Polar Orbiter mission as a Technology Reference Study. The goal is to focus the development of strategically important technologies of potential relevance to future science missions. The technology is solar sailing, and so the use of solar sail propulsion is, thus, defined a priori. The primary mission architecture utilizes maximum Soyuz Fregat 2-1b launch ...
T the time of the Great European Excursion in the sixteenth century, the sail known as the lateen was in use in three different regions of the world. In the orthodox view, its existence and distribu-tion are a matter of importance for several reasons. First, sails as an artifact have not demonstrated very great human inventiveness, and since the lateen requires some ingenuity to conceive, its d...
The electric solar wind sail (E-sail) is a space propulsion concept that uses the natural solar wind dynamic pressure for producing spacecraft thrust. In its baseline form, the E-sail consists of a number of long, thin, conducting, and centrifugally stretched tethers, which are kept in a high positive potential by an onboard electron gun. The concept gains its efficiency from the fact that the ...
Solar sailing is an enabling technology for many mission applications. One potential application is the use of a sail as a communications relay for a base at the lunar south pole. A survey of the design space for a solar sail spacecraft that orbits in view of the lunar south pole at all times demonstrates that trajectory options are available for sails with characteristic acceleration values of...
Although several new therapeutic approaches have improved outcomes in the treatment of hematologic malignancies, unmet need persists in acute myeloid leukemia (AML), multiple myeloma (MM) and non-Hodgkin's lymphoma. Here we describe the proteomic identification of a novel cancer target, SAIL (Surface Antigen In Leukemia), whose expression is observed in AML, MM, chronic lymphocytic leukemia (CL...
This paper proposes the use of doubly-symmetric, eight-shaped orbits in the circular restricted three-body problem for continuous coverage of the high-latitude regions of the Earth. These orbits, for a range of amplitudes, spend a large fraction of their period above either pole of the Earth. It is shown that they complement Sun-synchronous polar and highly eccentric Molniya orbits, and present...
Keggin-type polyoxometalate (POM), phosphotungstic acid (H3PW12O40), was encapsulated by an oppositely charged COOH-functionalized surface active ionic liquid (SAIL), N-decyl-N′carboxymethyl imidazolium bromide ([N-C10, N′-COOH-Im]Br), with the assistance of an ionic self-assembly (ISA) process in an aqueous environment. The as-prepared POM/SAIL material possesses multiple active properties, in...
[Gr72] Graham R., " An efficient algorithm for determining the convex hull of a planar set, " In-A simple algorithm for determining the envelope of a set of lines, " Information [To91] Toussaint G.T., " Computing morphological properties of arrangements of lines, " Proc. [Ve87] Vegter G., " Computing the bounded region determined by finitely many lines in the plane, " Technical Report 87-03, [Z...
There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it. The scientific interest in near-Earth asteroids (NEAs) and the classification of some of those as potentially hazardous asteroid for the Earth stipulated the interest in NEA exploration. Close-up observations of these objects will increase dras...
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