نتایج جستجو برای: asteroidal number

تعداد نتایج: 1168672  

2006
O. Eugster G. F. Herzog K. Marti M. W. Caffee

During the 4.56-G.y. history of the solar system, every meteorite experienced at least one exposure to cosmic rays as a meter-sized meteoroid. The cosmic-ray exposure (CRE) age of a meteorite measures the integral time of exposure to galactic cosmic rays (GCRs). A fraction of meteoritic material was also irradiated by cosmic rays before ejection from kilometer-sized parent bodies (pre-irradiati...

2009
Jianghui JI Lin LIU Hiroshi KINOSHITA Guangyu LI

We perform numerical simulations to study the Habitable zones (HZs) and dynamical structure for Earth-mass planets in multiple planetary systems. For example, in the HD 69830 system, we extensively explore the planetary configuration of three Neptune-mass companions with one massive terrestrial planet residing in 0.07 AU 6 a 6 1.20 AU, to examine the asteroid structure in this system. We underl...

2006
Michael K. Weisberg Timothy J. McCoy Alexander N. Krot

Classification of meteorites is largely based on their mineralogical and petrographic characteristics and their whole-rock chemical and O-isotopic compositions. According to the currently used classification scheme, meteorites are divided into chondrites, primitive achondrites, and achondrites. There are 15 chondrite groups, including 8 carbonaceous (CI, CM, CO, CV, CK, CR, CH, CB), 3 ordinary ...

Journal: :Celestial Mechanics and Dynamical Astronomy 2010

2017
Grant M Kennedy Matthew A Kenworthy Joshua Pepper Joseph E Rodriguez Robert J Siverd Keivan G Stassun Mark C Wyatt

RZ Psc is a young Sun-like star, long associated with the UXor class of variable stars, which is partially or wholly dimmed by dust clumps several times each year. The system has a bright and variable infrared excess, which has been interpreted as evidence that the dimming events are the passage of asteroidal fragments in front of the host star. Here, we present a decade of optical photometry o...

2007

Since the inception of the Diffie-Hellman protocol in 1976, it has been an elusive open problem to construct a one-round group key exchange (GKE) protocol. In this paper, we investigate the open problem and answer it in a modular way. We first revisit the GKE definition and distinguish the conventional (symmetric) group key exchange from asymmetric group key exchange (ASGKE) protocols. In the l...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی و علوم دریایی 1388

this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...

Journal: :Monthly Notices of the Royal Astronomical Society: Letters 2018

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