منابع مشابه
Quadrantids and the lunar Na atmosphere
Enhancements of the Na emission and temperature from the lunar atmosphere were reported during the Leonids meteor showers of 1995, 1997 and 1998. Here we report a search for similar enhancement during the 1999 Quadrantids, which have the highest mass flux of any of the major streams. No enhancements were detected. We suggest that different chemical-physical properties of the Leonid and Quadrant...
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The author presents details on the cleaning and disinfection of specialised farrowing accommodation within an intensive pig unit. Procedures are described for use in two quite different sets of circumstances, as follows: in the event of the occurrence of one of the major notifiable epizootic diseases; routine cleaning and disinfection as part of normal management procedures. In the former case,...
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Believable 3D animation of walking or running characters still requires complex motion capture technology or extensive skills in manual keyframing. We present an inexpensive, yet natural input method: The user “walks” on a digital graphics tablet, striding over the surface with two pens in his or her hands, where each pen represents one leg. This technique leverages the popular graphics tablets...
متن کاملMeteor stream activity V. The Quadrantids, a very young stream
This paper presents the first large set of precisely reduced orbits of Quadrantid meteoroids. These orbits were obtained from photographic observations during the 1995 return of the Quadrantid stream. The orbits refer to the main peak of the activity curve, with an unidentified few being part of a broad background component. The measured dispersion of orbits is less than from previous data obta...
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The process by which human fingers gives rise to stable contacts with smooth, hard objects is surprisingly slow. Using high-resolution imaging, we found that, when pressed against glass, the actual contact made by finger pad ridges evolved over time following a first-order kinetics relationship. This evolution was the result of a two-stage coalescence process of microscopic junctions made betwe...
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ژورنال
عنوان ژورنال: Nature
سال: 1883
ISSN: 0028-0836,1476-4687
DOI: 10.1038/029104a0