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29 results for “Stars”
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Review ArticleOpen accessIn the abstractAbout Northrop GrummanRelly Victoria Petrescu, Raffaella Aversa, Bilal Akash et al.The Northrop Grumman (formerly Ryan Aeronautical) RQ-4 Global Hawk (known as Tier II+ during development) is an Unmanned Aerial Vehicle (UAV) used by the United States Air Force and Navy and the German Air Force as a surveillance aircraft. The Northrop Grumman B-2 Spirit (also known as the Stealth Bomber) is an American strategic bomber, featuring low observable stealth technology … …Journal of Aircraft and Spacecraft Technology, Vol. 1, Issue 3 · 19 Aug 2017 · 9,176 accessesView PDFCite
Research ArticleOpen accessIn the abstractStar Catalog Generation for Satellite Attitude Navigation Using Density Based ClusteringMuhammad Arif Saifudin, Bib Paruhum Silalahi, Imas Sukaesih SitanggangA new method to generate star catalog using density-based clustering is proposed. It identifies regions of a high star density by using Density-Based Spatial Clustering of Application with Noise (DBSCAN) algorithm. Reducing the number stars performed by storing the brightest star in each cluster. The brightest star and all non-clustered members are then stored as a navigation star candidate. Monte … …Journal of Computer Science, Vol. 11, Issue 12 · 1 Feb 2016 · 6,975 accessesView PDFCite
Research ArticleOpen accessIn the abstractDeficient Reasoning for Dark Matter in GalaxiesJames Q. Feng, C.F. GalloIn this universe, not all of the matter around us can be readily seen. The further an object is away from us and the less luminous it is, the less visible it becomes. Just by looking at an object is usually difficult, if not impossible, to tell the amount of mass it contains. But astronomers have been using the measured … …Physics International, Vol. 6, Issue 1 · 14 Sep 2015 · 8,290 accessesView PDFCite
Research ArticleOpen accessIn the abstractEXTENDED MASS RELATION FOR SEVEN FUNDAMENTAL MASSES AND NEW EVIDENCE OF LARGE NUMBERS HYPOTHESISCurtis J. Forsythe, Dimitar T. ValevA previously derived mass relation has been extended to seven equidistant fundamental masses covering an extremely large mass range from ~10-69 to ~1053 kg. Six of these masses are successfully identified as mass of the observable universe, Eddington mass limit of the most massive stars, mass of hypothetical quantum “Gravity Atom” whose gravitational potential is equal to electrostatic potential e2/S, … …Physics International, Vol. 5, Issue 2 · 16 Jul 2014 · 8,274 accessesView PDFCite
Research ArticleOpen accessIn the abstractKRETSCHMANN INVARIANT AND RELATIONS BETWEEN SPACETIME SINGULARITIES ENTROPY AND INFORMATIONIoannis Gkigkitzis, Ioannis Haranas, Omiros RagosCurvature invariants are scalar quantities constructed from tensors that represent curvature. One of the most basic polynomial curvature invariants in general relativity is the Kretschmann scalar. This study is an investigation of this curvature invariant and the connection of geometry to entropy and information of different metrics and black holes. The scalar gives the curvature of the spacetime as a … …Physics International, Vol. 5, Issue 1 · 28 Mar 2014 · 11,920 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Gravity Field of a CubeJames Michael Chappell, Mark John Chappell, Azhar Iqbal, Derek AbbottWe calculate the Newtonian gravitational potential and field of a cubic, homogeneous asteroid and we apply it to the orbit of possible satellites. Large astronomical objects such as stars or planets, naturally tend to form spherical shapes due to the dominance of the gravitational forces, but as a thought experiment, we consider the properties of a planet in the form … …Physics International, Vol. 3, Issue 2 · 27 Mar 2013 · 15,337 accessesView PDFCite
Research ArticleOpen accessIn the abstractHumoral Immune Responses to Various Antigens in the Asterids: A. gibbosa and A. rubensMichel LeclercImmunizations with various antigens of the sea stars Asterina gibbosa and Asterias rubens produce specific humoral immune reactions which initiate the antibody factor. This antibody factor is correlated with kappa genes and could be composed of 4 kappa chains. It is the first time that such phenomenom was described in an invertebrate. …American Journal of Immunology, Vol. 8, Issue 4 · 15 Feb 2013 · 7,309 accessesView PDFCite
Research ArticleOpen accessIn the abstractThe Importance of Numbers and the Need to Study Primes: The Prime QuestionsMatthew Curtis, Gurudeo A. TularamProblem statement: The study of prime numbers is important today as it was in ancient times. The level of interest in any form of mathematics of students in Australian high schools is decreasing and furthermore the level of interest in number theory is also less that it was before; prime numbers is not being considered as an area of interest … …Journal of Mathematics and Statistics, Vol. 7, Issue 4 · 14 Sep 2011 · 9,665 accessesView PDFCite
Research ArticleOpen accessIn the abstractSurvey of Frontier Technologies and Approaches to Enable Humans-Mars Both Safe and AffordableDennis Meyer BushnellFrontier technologies and systems that could reduce costs and improve human health and safety for human missions to Mars. Overall cost reductions increase funding opportunities for addressing serious radiation and reduce gravity health impacts for human-mars class missions. Major cost reduction/health improvement opportunities include fast transit via either starship due to low-cost chemical fuels in space, or high thrust electric … …Journal of Aircraft and Spacecraft Technology, Vol. 8, Issue 1 · 13 Nov 2024 · 7,615 accessesView PDFCite