Search for Transits of a Short-Period, Sub-Saturn Extrasolar Planet Orbiting HD 46375

Precise brightness measurements of HD 46375 have been acquired with an automatic telescope to search for transits of its short-period, sub-Saturn extrasolar planet. Transits of the companion do not occur, indicating that the inclination of the orbit i is less than 83 degrees and sini is less than 0.992. This upper limit on sini still preserves the possibility that the mass of the planet is less than Saturn's. Analysis of the photometry for HD 46375 reveals no photometric variability larger than 0.0001+/-0.0002 mag at the orbital period of the planet. This effectively eliminates starspots and stellar pulsations as the cause of the radial velocity variations used to infer the planet's existence.     

铁岭千亩地支撑起产值超百亿煤机产业群

近日,从首届辽宁（铁岭）煤机装备博览会上传出振奋人心的消息：博览会成交金额达32．5亿元,参展的厂家感叹,这些成果是调兵山市利用千亩专项用地打造煤机产业园的结果。     

适用于专用微波遥感成像仪的新的地球物理算法

一、引言自发射第一颗"专用的微波遥感成像仪"(SSM/I)以来,三年的时间已经过去了.真正经过检验并正式发表的、估算全球范围内海洋上空大气参数的方法仍少得惊人.因为我们的兴趣在于用SSM/I的数据对海洋上空的天气系统做个例研究,所以我们要组合成一套统一的计算方法,使我们能够从原始的SSM/I图象提取出最多的有用的环境信息,同时又照顾到遥感器的分辨率和交叉参数的污染.虽然这一目标只部分得以实现,