نتایج جستجو برای: mars modeling

تعداد نتایج: 402551  

2017
Hans U Gerth Michele Pohlen Gerold Thölking Hermann Pavenstädt Marcus Brand Christian Wilms Anna Hüsing-Kabar Dennis Görlich Iyad Kabar Hartmut H J Schmidt

BACKGROUND The primary therapeutic goals in the treatment of liver injury are to support liver regeneration or bridge the gap to liver transplantation (LT). Molecular adsorbent recirculating system (MARS) therapy has shown beneficial effects for specific symptoms of liver failure; however, general survival advantages have not yet been demonstrated. AIM We studied the effects of MARS therapy c...

2007
José Saraiva Lourenço Bandeira Teresa Barata Pedro Pina

This paper presents an approach to recognise polygonal patterns occurring in the surface of Mars using images obtained by the Mars Orbiter Camera onboard Mars Global Surveyor probe.

2015
Duy Luong Richard W. Court Mark R. Sims David C. Cullen Mark A. Sephton

The first step in many life detection protocols on Mars involves attempts to extract or isolate organic matter from its mineral matrix. A number of extraction options are available and include heat and solvent assisted methods. Recent operations on Mars indicate that heating samples can cause the loss or obfuscation of organic signals from target materials, raising the importance of solvent-bas...

2015
U. Singh

Mars atmospheric characterization is critical for exploring the planet. Future Mars missions require landing massive payloads to the surface with high accuracy. The accuracy of entry, descent and landing (EDL) of a payload is a major technical challenge for future Mars missions. Mars EDL depends on atmospheric conditions such as density, wind and dust as well as surface topography. A Mars orbit...

2017
Shintaro Azuma Ikuo Katayama

The evolution of Mars has been greatly influenced by temporal changes in its rheological structure, which may explain the difference in tectonics between Mars and Earth. Some previous studies have shown the rheological structures of Mars calculated from the flow law of rocks and the predicted thermal structure. However, the Peierls mechanism, which is the dominant deformation mechanism at relat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی شاهرود - دانشکده ریاضی 1391

مدل های نیمه پارامتری اولین بار توسط انگل و همکارانش در سال 1986 معرفی شدند. انگل و همکارانش (1986) و چن و شیائو (1991) از روش کمترین توان های دوم جریمه ای (اسپلاین هموارساز)، فریدمن (1990) با استفاده از رگرسیون تطبیقی چند متغیره اسپلاین (mars)، کیوزیک و همکارانش (1992) با استفاده از روش مانده های جزئی، سورینی و وانگ (1992) و کارول و همکارانش (1997) با استفاده از روش درستنمایی نیمرخ، پارامترهای...

2014
X. Ceamanos S. Douté J. Fernando F. Schmidt P. Pinet A. Lyapustin

[1] This article addresses the correction for aerosol effects in near-simultaneous multiangle observations acquired by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) aboard the Mars Reconnaissance Orbiter. In the targeted mode, CRISM senses the surface of Mars using 11 viewing angles, which allow it to provide unique information on the scattering properties of surface material...

Journal: :Social studies of science 2017
Lisa Messeri

Science and technology studies (STS) and critical cartography are both asking questions about the ontological fixity of maps and other scientific objects. This paper examines how a group of NASA computer scientists who call themselves The Mapmakers conceptualizes and creates maps in service of different commitments. The maps under construction are those of alien Mars, produced through partnersh...

2008
J. S. Levine M. E. Summers

Introduction: Measurements from the Viking Landers and Mars Pathfinder have shown that sulfur is a significant component of the surface of Mars [1]. However, one of the major and most surprising findings of the Mars Exploration Rovers [2] and the ESA Mars Express OMEGA instrument [3, 4, 5] is how widespread sulfate minerals, in the form of gypsum (CaSO 4

Journal: :Astrobiology 2014
John D Rummel David W Beaty Melissa A Jones Corien Bakermans Nadine G Barlow Penelope J Boston Vincent F Chevrier Benton C Clark Jean-Pierre P de Vera Raina V Gough John E Hallsworth James W Head Victoria J Hipkin Thomas L Kieft Alfred S McEwen Michael T Mellon Jill A Mikucki Wayne L Nicholson Christopher R Omelon Ronald Peterson Eric E Roden Barbara Sherwood Lollar Kenneth L Tanaka Donna Viola James J Wray

A committee of the Mars Exploration Program Analysis Group (MEPAG) has reviewed and updated the description of Special Regions on Mars as places where terrestrial organisms might replicate (per the COSPAR Planetary Protection Policy). This review and update was conducted by an international team (SR-SAG2) drawn from both the biological science and Mars exploration communities, focused on unders...

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