个人认为译得很好!除了个别句子有些不通顺外没有大错误。 只是下次请记得排版,最少分个段嘛。。
Asteroids@homeis a research project that uses Internet-connected computers to do research inAsteroids@home. You can participate by downloading and running a free programon your computer. Asteroids are the most numerous objects in the solar system.So far, hundreds of thousands of asteroids are known, with hundres of newdiscoveries every day. Altough the total number of known asteroids is large,very little is known about the physical properties of individual objects. For asignificant part of the population, only the size of the bodies is known. Otherphysical parameters (the shape, the rotation period, direction of the rotationaxis,...) are known only for hundreds of objects. Asteroids@home是一个使用联网计算机进行研究的研究项目。您可以通过在您的电脑上下载并运行一个免费的程序来加入此项目。小行星是太阳系中数量最多的天体。目前我们已知的小行星数量已有数十万之多,并且正以每天数百个的速度增长着。然而,尽管为人所知的小行星数量众多,但对每个小行星的物理特性我们仍知之甚少。对于绝大部分已知的小行星,我们只知道其规模。其他物理参数(如形状、自转周期、自转轴方向等等校注:rotation我想是泛指自转和公转,所以这里译作“旋转周期”和“旋转轴方向”是否好些?供参考)已知的小行星仅有几百个。
Becauseasteroids have in general irregular shapes and they rotate, the amount ofsunlight they scatter towards the observer varies with time. This variation ofbrightness with time is called a lightcurve. The shape of a lightcurve dependson the shape of asteroid and also on the viewing and illumination geometry. Ifa sufficient number of lightcurves observed under various geometries iscollected, a unique physical model of the asteroid can be reconstucted by thelightcurve inversion method. 因为小行星通常有不规则的外形与轨迹,它们反射给观察者的光线也随时间变化着。这种亮度随时间变化而得到的曲线叫做光变曲线。光变曲线的形状取决于小行星的形状,同时也取决于观测方式与光照几何学方面的性质。如果能收集到足够的反映不同几何学特征的光变曲线,那么就可以通过对其进行转化,从而建立一个独一无二的小行星物理模型。
The project Asteroids@home was started with the aim tosignificanly enlarge our knowledge of physical properties of asteroids. TheBOINC application uses photometric measurements of asteroids observed byprofessional big all-sky surveys as well as 'backyard' astronomers. The data isprocessed using the lightcurve inversion method and a 3D shape model of anasteroid together with the rotation period and the direction of the spin axisare derived. Asteroids@home是以“为了有效地增进我们对于小行星物理特性的认识”这一初衷而开展的一个项目,这个BOINC平台下的应用程序所使用的光度测量数据是由专业的大型全天空探测器和处于背光处的天文学家们收集到的。这些数据是由光变曲线转化法、小行星3D模型、小行星自转周期以及自转轴方向导出的。校注:和上边同样的建议
Because the photometric data from all-sky surveys aretypically sparse in time, the rotation period is not directly 'visible' in thedata and the huge parameter space has to be scanned to find the best solution.In such cases, the lightcurve inversion is very time-consuming and thedistributed computation is the only way how to efficiently deal with photometryof hundres of thousands of asteroids. Moreover, in order to reveal biases inthe method and reconstruct the real distribution of physical parameters in theasteroid population, it is necessary to process large data sets of 'synthetic'populations. 由于这些来自全天空探测器没有足够长期的光度测量数据,因此自转周期并不能在数据之中直接“看”出,所以最佳的解决方式只能是在海量的数据之中寻找。在这种情况下,光变曲线转化法是一个非常耗时的方法,且只有通过分布式计算的方式才能有效地处理来自数以万计小行星的光度测量数据。但是为了展现这种方法的作用,并且通过各种物理参数真实地再现小行星的的分布,处理海量的数据是非常必要的。 |