“忧”比“喜”更重要——我们步入的时代不仅仅是经济的后危机时代

2009年11月11日,正在新加坡参加亚太经合组织领导人会议周活动的世界银行行长佐利克说:如果美国不能很好地处理贸易和财政"双赤字"问题,美元就有可能失去世界主要储备货币的地位.他说:美元能够成为世界主要储备货币,是美国用了约200年的辛苦努力换来的.他还说:鉴于中国经济增长趋势和中国为使人民币国际化所做的努力,未来15年内,人民币有可能成为代替美元的国际储备货币之一.     

声音

中国经济已经进入新的发展阶段．正在进行深刻的方式转变和结构调整。这必然伴随调整的阵痛、成长的烦恼,彩虹往往出现在风雨之后。没有比人更高的山．没有比脚更长的路。只要我们锲而不舍前进．就有达到目的的那一天,,我们既要大胆探索、勇于开拓,也要稳妥审慎、三思而后行.我们要坚持改革开放正确方向．切实做到改革不停顿、开放不止步.——国家主席习近平出席亚太经合组织工商领导人峰会并发表主旨演讲时强调     

The advection-dominated accretion flow＋thin accretion disk model for two low-luminosity active galactic nuclei： M81 and NGC 4579

It was found that advection-dominated accretion flow (ADAF)+thin disk model calculations can reproduce the observed spectral energy distributions (SEDs) of two low- luminosity active galactic nuclei (AGNs), provided they are accreting at ～ 0.01 - 0.03 Eddington rates and the thin disks are truncated to ADAFs at～ 100Rs (Rs is the Schwarzschild radius) for M81 and NGC 4579 (Quataert et al. 1999). However, the black hole masses adopted in their work are about one order of magnitude lower than recent measurements on these two sources. Adopting the well estimated black hole masses, our ADAF+thin disk model calculations can reproduce the observed SEDs of these two low- luminosity AGNs, if the black hole is accreting at 2.5 × 10-4 Eddington rates with the thin disk truncated at Rtr = 120Rs for M81 ((m) = 3.3 × 10-3 and Rtr = 80Rs are required for NGC 4579). The transition zones with temperature from the thin disk with 104 - 105 to～109 - 1010 K in the ADAF will inevitably emit thermal X-ray lines, which provides a useful diagnosis of their physical properties. The observed widths of the thermal X-ray iron lines at(～)6.8 keV are consistent with Doppler broadening by Keplerian motion of the gases in the transition zones at～100Rs. We use the structure of the transition zone between the ADAF and the thin disk derived by assuming the turbulent diffusive heat mechanism to calculate their thermal X-ray line emission with the standard software package Astrophysical Plasma Emission Code (APEC). Comparing them with the equivalent widths of the observed thermal X-ray iron lines in these two sources, we find that the turbulent diffusive heat mechanism seems to be unable to reproduce the ob- served thermal X-ray line emission. The test of the evaporation model for the accretion mode transition with the observed thermal X-ray line emission is briefly discussed.     

第二届亚太经合组织蓝色经济论坛在津开幕

12月6日上午,以"发展蓝色经济,促进可持续发展"为主题的第二届亚太经合组织(APEC)蓝色经济论坛在天津开幕。中国国家海洋局局长刘赐贵,中国天津市副市长熊建平,亚太经合组织秘书处项目经理娜塔丽出席论坛开幕式并致辞。开幕式由中国国家海洋局副局长陈连增主持。中国海洋石油总公司董事长王宜林作特邀报告。来自亚太区域15个经济体成员以及柬埔寨、斯里兰卡和