~(207)Rn能级结构的实验研究

利用能量为 85— 95MeV的1 6O束流 ,通过1 96Pt(1 6O ,5n) 2 0 7Rn反应布居了2 0 7Rn的高自旋态 .实验进行了γ射线的激发函数、γ射线的单谱、衰变谱和γ γ t符合测量 .建立了由 1 7条γ射线组成的2 0 7Rn能级纲图 ,并且基于实验测量的DCO系数建议了各能级的自旋值 .用一个f5 2 价中子空穴与2 0 8Rn核芯耦合定性地解释了2 0 7Rn的低位激发态

The masses and radii of HD 186753B and TYC7096-222-1B: the discovery of two M-dwarfs that eclipse A-type stars

We present observations of two new single-lined eclipsing binaries, both consisting of an Am star and an M-dwarf, discovered by the Wide Angle Search for Planets transit photometry survey. Using WASP photometry and spectroscopic measurements we find that HD 186753B has an orbital period of P=1.9194 days, a mass of M=0.24±0.02~M? and radius of R=0.31+0.06-0.06~R?; and that TCY7096-222-1B has an orbital period of P=8.9582 days, a mass of between 0.29 and 0.54 M? depending on eccentricity and radius of R=0.263+0.02-0.07~R?. We find that the Am stars have relatively low rotational velocities that closely match the orbital velocities of the M-dwarfs, suggesting that they have been “spun-down” by the M-dwarfs.

As cidades médias e suas múltiplas particularidades: produção e consumo do espaço urbano em Marília - SP e Mossoró - RN

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

HG 222.70-222.80 Thin Section

Coarse brown sediment with clasts ranging from small to medium. Clasts are sub-angular to sub-rounded. Rotation structures can be seen throughout the image. Multiple rotations can be seen around single clasts. Minor amounts of comet structures and grain stacking can also be seen.

Determinación de la actividad alfa debida al radón-222 y a sus descendientes, existente en el agua potable de la ciudad de Monterrey, Nuevo León, y su área metropolitana

Tesis (Maestría en Ciencias, con especialidad en Ingeniería Nuclear) U.A.N.L.

Comparative efficacy of MS-222 and benzocaine as anaesthetics under simulated transport conditions of a tropical ornamental fish Puntius filamentosus(Valenciennes)

There is a growing commercial interest in the ¢sh, Puntius ¢lamentosus, in the ornamental ¢sh trade in India and elsewhere.The trade is, however, hampered by severe mortalities during transport of the ¢sh owing to insu⁄cient data available on the use of anaesthetics. To resolve this problem, we evaluated the e⁄cacy of two anaesthetics, MS-222 and benzocaine, in sedating P. ¢lamentosus in simulated transportation experiments and used stress response parameters such as cortisol and blood glucose levels to perform assessments. We observed that MS-222 at 40 mg L 1 and benzocaine at 20mg L 1 were su⁄- cient to induce sedation for 48 h. Above these concentrations, both the anaesthetics adversely a¡ected the ¢sh and resulted inmortalities. Both anaesthetics signi¢cantly lowered the blood cortisol and glucose levels compared with the unsedated controls. Importantly, the anaesthetics treatment signi¢cantly lowered the post-transport mortality in the ¢sh. The results of the study show that MS-222 and benzocaine could be used as sedatives to alleviate transport- related stress in P. ¢lamentosus to improve their post-transport survival and hence reduce economic loss.