Unprincipled microgravity

I argue that the key principle of microgravity is what I have called elsewhere the Lorentzian strategy. This strategy may be seen as either a reverse-engineering approach or a descent with modification approach, but however one sees if the method works neither by attempting to propound a theory that is the quantum version of either an extant or generalized gravitation theory nor by attempting to propound a theory that is the final version of quantum mechanics and finding gravity within it. Instead the method works by beginning with what we are pretty sure is a good approximation to the low-energy limit of whatever the real microprocesses are that generate what we experience as gravitation. This method is powerful, fruitful, and not committed to principles for which we have, as yet, only scant evidence; the method begins with what we do know and teases out what we can know next. The principle is methodological, not ontological.     

Numerical study of water mist centerline velocity in microgravity

With water mist regarded as a promising fireextinguishing agent in spacecraft, it is necessary to investigate characteristics of water mist in microgravity. In this paper, FDS 6.0 is used to measure the centerline velocity of water mist with various initial velocities and the spray distance. The droplets will approach their terminal velocity after leaving the nozzle in normal-gravity, which agrees with the theoretical calculation. The velocity of water mist declines in microgravity. The polynomials of the velocity change are given in microgravity, which makes it possible to obtain the velocity with the spray distance increase when arbitrary initial velocity is given.     

SZ-8飞船用蛋白质结晶装置的研制

空间的微重力环境有助于改善蛋白质晶体的生长质量。为解析高分辨率的蛋白质分子结构和进一步的理性药物设计提供帮助。为利用德国提供的空间生物培养箱在我国的SZ—8飞船上实施空间蛋白质结晶实验,研制了新型实验装置。新装置具有120个结晶室单元,重0.11 kg,体积10-4m3,单个结晶室蛋白液用量可少至1μL。对汽相扩散和液-液扩散蛋白质结晶方法通用,而且不需要电力供应,没有运动部件。经火箭发射和飞船返回的力学环境模拟测试以及实际结晶实验验证,表明装置安全可靠,满足使用需求。     

界面动力学对微重力下溶液法晶体生长的生长界面和溶解界面稳定性的影响

用一个二维的数学模型研究微重力条件下溶液法晶体生长的晶体生长界面和溶解界面的稳定性以及界面动力学对界面稳定性的影响.研究表明,不管是否考虑界面动力学效应都存在稳定的晶体生长界面和溶解界面,其形状都是上部适当后倾的适当形状的曲面.计算了在各种情况下晶体生长稳定界面和溶解稳定界面的形状.界面动力学使晶体生长稳定界面的倾斜度变小,使溶解稳定界面的倾斜度略微变小.