Age control points and sedimentation rates of ODP Hole 145-887B (Table 1)

Hole 887B of the Ocean Drilling Program (ODP) comprises a 44 m (750 kyr) long continuous section recovered from the Patton-Murray Rise, an elevated plateau that is largely isolated from turbidite deposition. The Patton-Murray area is centered under the Alaska Gyre, a region characterized by the domal upwelling of nutrient-rich waters. Marked increases in productivity and rapid settling of biogenic matter are suggested throughout the section by the episodic accumulation of diatomaceous oozes up to ~1 m thick that are accompanied by barium enrichments. Significant delta13Corg maxima in the major diatomaceous bands suggest that mixedlayer [CO2(aq)] may have been drawn down significantly during some of the productivity events. The episodes of enhanced productivity at Site 887 occur synchronously with short-lived minima in planktonic foram delta18O, suggesting a direct link to low salinity, or less likely, warming, events in the Gulf of Alaska. There is no obvious explanation for the events, but they may be related to seasonal incursions of meltwater from Alaska. We speculate that episodic input of meltwater- or dust-borne iron from Asian or Alaskan sources may have promoted the extraordinary diatom production events recorded in the sedimentary record.

Sapientia, 1982, Vol. XXXVII, nº 145 (número completo)

Contenido: La participación del ser III : la participación del acto de ser o existencia / Octavio N. Derisi – La metafísica cristiana en el desarrollo del pensamiento occidental / Alberto Caturelli – El “principium essendi” del hombre y su conocimiento / Julio R. Méndez – El intelecto en el De Anima de Aristóteles : comentario a los capítulos cuarto y quinto del libro III / Ciro Schmidt Andrade – La formación metafísica cristiana en la universidad / Octavio N. Derisi – Rasgos actuales del pensamiento político de Aristóteles / Alberto Buela – Notas y comentarios -- Bibliografía

原子核~(145)Tb的多准粒子激发态

利用能量为165 MeV的32S束流, 通过反应118Sn(32S, 1p4n)布居了145Tb的高自旋态. 基于标准在束核谱学实验测量结果, 首次建立了激发能高达 7.4 MeV的145Tb能级纲图. 145Tb的能级结构具有球形原子核的特征, 其高自旋态是由单粒子激发形成的. 根据邻近N = 80同中子素核结构的系统性, 采用一个11/2h价质子与偶偶核芯144Gd的弱耦合很好地解释了145Tb激发能在2 MeV以下的能级结构. 利用多准粒子壳模型组态解释了激发能在2 MeV以上的晕态和部分近晕态能级.

~(145)Tb的高自旋态能级纲图

利用能量为 1 61— 1 75MeV的32 S束流 ,通过反应118Sn( 32 S ,1p4n)产生了145 　Tb的高自旋态 .进行了γ射线的激发函数、γ γ t符合测量 .首先建议了由 2 4条能级和 4 2条γ跃迁组成的145 Tb核的能级纲图 ,并指定了各条能级的自旋值及部分低位能级的宇称 .用一个πh11/ 2 价质子与144 Gd核芯激发态的耦合定性地解释了145 Tb的一些低位激发态