999 resultados para 09040704 CTD-127
Resumo:
The feeding of freshwater copepods, especially cyclopoida, has been poorly covered in research so far. The majority of existing special works on the feeding of cyclopoida illustrate this question only from the qualitative side. The food content of the nauplius of freshwater cyclops has not been studied at all, as also the feeding of adult entomostracans on bacteria. Moreover the question of the suitability of vegetable food for Cyclops is not clear enough. This article aims to elucidate as fully as possible the nutrition of Acanthocyclops viridis (Jur.) - a large cyclops, inhabiting the mass of demersal layers of the open parts of the Rybinsk reservoir and its foreshore. The present work is devoted only to the predatory feeding of A. viridis, and includes data from the content of the intestines of cyclops, collected in natural conditions, and also the results of experimental observations carried out in a laboratory during 1958.
Resumo:
In the waterbodies of central Russia, the Urals and western Siberia four species of Crustacea, related to the genus Mesocyclops, are widely distributed: M. (s.str.) leuckarti (Claus), M. (Thermocyclops) oithonoides Sars, [M.](Th.) crassus (Fisch.) and M. (Th.) dybowskii (Lande). Numbers and biomass of Mesocyclops oithonoides in the pelagic water of various water-bodies of the Urals are presented and observations on the above mentioned species are discussed.
Resumo:
The Nutrient Enhanced Coastal Ocean Productivity (NECOP) Program is a component of NOAA's Coastal Ocean Program. The central hypothesis of this research is: Anthropogenic nutrient inputs have enhanced coastal ocean productivity with subsequent impacts on coastal ocean water quality, living resource yields, and the global marine carbon cycle. The initial study area for this program is the Mississippi/Atchafalaya River Outflow and adjacent Louisiana shelf region.
Resumo:
针对高电荷态离子与表面作用产生的溅射离子能谱测量,研制了一台127°径向位置灵敏柱形静电离子能谱仪。利用能量为800keV的Ar8+离子轰击金属铍靶产生的溅射离子测试了本谱仪。测试结果表明,该谱仪克服了传统静电谱仪通过扫描工作电压单能量点取谱的缺点,实现分段取谱——在单个工作电压下可同时获取一段0.85E≤E≤1.15E范围的能谱,从而提高测量效率。
Resumo:
利用1 2 4 Sn( 7Li,4n) 1 2 7I反应研究了1 2 7I核的在束γ谱 ,建立了包括 2 5个新能级和 52条新γ射线构成的新能级纲图 .将基于πh1 1 2 粒子态 ( 1 1 2 - )的负宇称能级推高到 ( 3 5 2 - ) ,在较重的1 2 7I核中得到了退耦合能级结构 .由于在两个正宇称带ΔI=2能级系列中观测到了强的带间跃迁 ,建议此带的主要成分为g7 2质子的组态 .另外还观测到了两个正宇称ΔI=2和ΔI=1能级系列 ,它们可能基于πd5 2 的单准粒子带和一个 3准粒子带 .
Resumo:
ESR method has been used to study superhyperfine. interaction of I-127 in [Cu (IO5OH)(2)](5-) ion for Na4KCu(IO5OH)(2) . 12H(2)O single crystal. The main purpose of this paper is to confirm the existence of unpaired electron spin on iodine atom and to find a reasonable explanation for the spin delocalization of CU2+ ions. Based on the ESR parameters of paramagnetic [Cu(IO5OH)(2)](5-) ions, the calculated results show that about 0.77% of the unpaired eletron spin is located on each iodine atom.
Resumo:
用ESR方法研究了[Cu(IO5OH)2]5-离子配合物中127I核的超超精细相互作用,旨在证实在碘离子上存在未成对电子自旋和找到一种解释Cu2+离子中电子离域的机制。根据ESR参数的计算指出碘离子上自旋密度为0.77%。
Resumo:
近年来,CuO_4平面中Cu~(2+)离子电子结构和二维磁性质引起人们的兴趣,例如铜系南温超导材料的Cu~(2+)和O~(2-)所构成平面方阵中,Cu~(2+)离子具有3d~9电子组态和dx~2-y~2的基态,但没有顺磁共振发生,对于这种反常现象的一种解释认为是由反