反质子与原子核的电荷交换反应

本文研究在扭曲波冲量近似下，反质子与原子核的电荷交换反应Ａ（ｐ，ｎ）Ｂ．用严格的分波法计算反质子能量为４６．８ＭｅＶ和１７９．７ＭｅＶ的１６Ｏ（ｐ－，ｎ－）１６Ｎ到达１－，３－态和１７Ｆ（ｐ－，ｎ－）１７Ｏ到达Ｏ＋，２＋态的微分截面．讨论了同位旋相似态跃迁和非相似态跃迁微分截面的差别．     

Extinction and climate change

Arising from F. He & S. P. Hubbell 473, 368-371 (2011). Statistical relationships between habitat area and the number of species observed (species-area relationships, SARs) are sometimes used to assess extinction risks following habitat destruction or loss of climatic suitability. He and Hubbell argue that the numbers of species confined to-rather than observed in-different areas (endemics-area relationships, EARs) should be used instead of SARs, and that SAR-based extinction estimates in the literature are too high. We suggest that He and Hubbell's SAR estimates are biased, that the empirical data they use are not appropriate to calculate extinction risks, and that their statements about extinction risks from climate change do not take into account non-SAR-based estimates or recent observations. Species have already responded to climate change in a manner consistent with high future extinction risks.