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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Synthese 〈Dordrecht〉 92 (1992), S. 371-384 
    ISSN: 1573-0964
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Philosophy
    Notes: Abstract Three of Zeno's objections to motion are answered by utilizing a version of nonstandard analysis, internal set theory, interpreted within an empirical context. Two of the objections are without force because they rely upon infinite sets, which always contain nonstandard real numbers. These numbers are devoid of ‘numerical meaning’, and thus one cannot render the judgment that an object is, in fact, located at a point in spacetime for which they would serve as coordinates. The third objection, ‘an arrow never appears to be moving’, is answered by showing that it only applies to a finite number of instants of time. A theory of motion is also advanced; it consists of a finite series of contiguous infinitesimal steps. The theory is immune to Zeno's first two objections because the number of steps is finite and each lies outside the domain of observation. ‘Present motion’ is hypothesized to be an unobservable process taking place within each step. The fact of motion is apparent through a summing (Riemann integration) of the steps.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2018-01-04
    Description: A machine learning approach to integrate big data for precision medicine in acute myeloid leukemia A machine learning approach to integrate big data for precision medicine in acute myeloid leukemia, Published online: 03 January 2018; doi:10.1038/s41467-017-02465-5 Identification of markers of drug response is essential for precision therapy. Here the authors introduce an algorithm that uses prior information about each gene’s importance in AML to identify the most predictive gene-drug associations from transcriptome and drug response data from 30 AML samples.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 3
  • 4
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    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Plans for the Comet Rendezvous Asteroid Flyby (CRAF) mission are discussed. The CRAF spacecraft and mission configurations are illustrated and the scientific studies planned for the mission are listed. The scientific benefits of the study of comets and asteroids are reviewed and the characteristics of Comet Kopff are outlined. In addition, the structure, propulsion, attitude and articulation control, radio frequency and antenna, power and pyro, command, and data storage subsystems are described.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Spaceflight (ISSN 0038-6340); 31; 195-201
    Format: text
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  • 5
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    In:  CASI
    Publication Date: 2013-08-31
    Description: The architecture of NASA's program of robotic Mars exploration missions received an intense scrutiny during the summer months of 1998. We present here the results of that scrutiny, and describe a list of Mars exploration missions which are now being proposed by the nation's space agency. The heart of the new program architecture consists of missions which will return samples of Martian rocks and soil back to Earth for analysis. A primary scientific goal for these missions is to understand Mars as a possible abode of past or present life. The current level of sophistication for detecting markers of biological processes and fossil or extant life forms is much higher in Earth-based laboratories than possible with remotely deployed instrumentation, and will remain so for at least the next decade. Hence, bringing Martian samples back to Earth is considered the best way to search for the desired evidence. A Mars sample return mission takes approximately three years to complete. Transit from Earth to Mars requires almost a single year. After a lapse of time of almost a year at Mars, during which orbital and surface operations can take place, and the correct return launch energy constraints are met, a Mars-to-Earth return flight can be initiated. This return leg also takes approximately one year. Opportunities to launch these 3-year sample return missions occur about every 2 years. The figure depicts schedules for flights to and from Mars for Earth launches in 2003, 2005, 2007 and 2009. Transits for less than 180 deg flight angle, measured from the sun, and more than 180 deg are both shown.
    Keywords: Lunar and Planetary Science and Exploration
    Format: application/pdf
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  • 6
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    In:  Other Sources
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
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  • 7
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    In:  Other Sources
    Publication Date: 2018-06-08
    Description: NASA's Mars Surveyor Program (MSP) will launch two mission to the red planet about every 26 months (determined by energy considerations) from 1996 through 2005 at an annual cost of $100 million dollars per year (excluding the launch vehicles). Mars Global Survey (1996) and Mars Surveyor 98 are described in other papers. This paper will focus on the planning that is under way for the MSP missions to be launched in 2001 and beyond.
    Keywords: Lunar and Planetary Science and Exploration
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  • 8
    Publication Date: 2019-07-13
    Keywords: Lunar and Planetary Science and Exploration
    Type: SPACE 2004 Conference; Sep 28, 2004 - Sep 30, 2004; San Diego, CA; United States
    Format: text
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  • 9
    Publication Date: 2019-07-13
    Description: In the not too distant future, NASA may consider sending a robotic mission to Mars to drill tens of meters below the surface to search for evidence of life. Mars science groups, including NASA's Mars Exploration Program Analysis Group (MEPAG), have repeatedly concluded that in situ scientific analyses of samples from significant depths below the surface are important for understanding Mars in general and for searching for evidence of past or present life in particular. Furthermore, there are several ongoing technology developments for relevant drills, the readiness of which seem promising for use by the second decade of this century. By accessing and analyzing material from tens of meters below the surface, in situ science investigations may help answer some important questions about Mars, in particular about whether life ever existed there. Drilling is a proven technique for terrestrial applications that appears viable for accessing Martian subsurface samples and bringing them to the surface for analysis by a variety of instruments. An end-to-end mission concept for a Deep Drill mission has been developed and appears feasible for launch in the next decade.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Space 2004; Sep 28, 2004 - Sep 30, 2004; San Diego, CA; United States
    Format: text
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