【摘 要】
：
Small planetary bodies usually have irregular shapes.If they are large enough to be heated to a partial melting status,the deforming force of gravity could over
【机 构】
：
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026
论文部分内容阅读
Small planetary bodies usually have irregular shapes.If they are large enough to be heated to a partial melting status,the deforming force of gravity could overcome the inteal forces and make the shape transfigure from potato-like to spherical.We have developed a model to calculate the thermal history of a planetoid and apply the model to asteroids,since ample evidence has shown that many asteroids could have undergone differentiation.After revealing the relation between the shape and the ratio of the melt part,we also examine the surface roughness of these asteroids and suggest that 280km would be a critical radius for an asteroid to develop a virtually globular contour.
其他文献
其实,英语的学习对一个学生的成长与发展是很重要的,大部分学生在学习英语初期没有意识到学习英语的重要性,频繁乏味的读写很快使他们产生了害怕学英语和讨厌学英语的悲观情
Using the shell-model Monte Carlo method and random phase approximation theory,we carry out an estimation on neutrino energy loss (NEL) of 52,53,54,55,56Fe.We f
随着市场经济的不断发展,旧的会计准则存在很大的滞后性,对企业的发展造成了一定的障碍。因此,实行新会计准则是企业管理的必然趋势。本文首先介绍了新会计准则的特点,然后在
Spinodal decomposition (SD) with different grain boundaries (GBs) is investigated on the atomic scale using the novel phase field crystal model.It is demonstrat
“干一行,爱一行,钻一行,精一行”是德兴市银城一小校长杨凌英的座右铭,也是她从教24年来的真实写照.她提出了“和雅教育”理念,追寻的是一种在和谐、和顺的教育环境中,以“
“纵有千古,横有八荒,文明古国,广治诗词。”古诗词是诉诸心灵的文学形式,是人类美好情感体验的智慧结晶。在小学语文中,对古典诗词的学习虽只是管中窥豹,亦可推全豹之雄伟。
快乐体育是指从终身体育与个人发展需要出发,从情感入手对学生进行以健全的人格教育,在向学生传授各种体育锻炼的方法以及掌握体育和卫生保健的基础知识和基本技术、技能时,
精细成本管理是动态的管理方法,在成本管理基础上,对企业成本进行精细、系统的管理。油气田企业精细成本管理作为国家安全战略的重要组成部分,不仅完善了成本的管理模式,还是
Zr0.9Mg0.1O2-δ nanofibers and ZrO2 nanofibers are synthesized using electrospinning and the calcination technique. The nanofibers are characterized using x-ray
情境教学是一个非常重要的教学理念与教学手段。情境教学是指在教学过程中教师有目的地引入或创设具有一定情绪色彩的、以形象为主体的生动具体的场景,以引起学生一定的态度