Operator's manual : cartridge, 40-mm, tactical CS, M651 (NSN 1310-00-849-2083).

"January 1975."

Operator's and organizational maintenance manual : detector kit, chemical agent, ABC-M18A2, (NSN 6665-00-903-4767).

"February 1976."

Operator's manual : M72A1 simulants chemical agent identification training set (NSN 6910-00-106-4800).

"15 July 1985."

Operator's manual : area predictor, radiological fallout, ABC-M5A2, (NSN 6665-00-106-9595).

"January 1975."

Operator's manual : radioactive test sample, krypton 85, gamma MX-7338/PDR-27.

"1 June 1986."

Formação contínua de professores em Educação Sexual: percepções de professores sobre as acções de formação e factores que têm influenciado a sua prática pedagógica: um contributo para a efectiva implementação da Educação Sexual nos Ensinos Básico - 2º e 3º Ciclos - e Secundários

Agostinho Ribeiro

Dynamics of Tm-Ho energy transfer and deactivation of the F-3(4) low level of thulium in fluorozirconate glasses

The mechanism involved in the Tm3+ (F-3(4))-->Ho3+ (I-5(7)) energy transfer and Tm3+ (H-3(4), H-3(6))-->Tm3+ (F-3(4), F-3(4)) cross relaxation as a function of the donor and acceptor concentrations was investigated in Tm-Ho-codoped fluorozirconate glasses. The experimental transfer rates were determined for the Tm-->Ho energy transfer from the best fit of the acceptor luminescence decay using an expression which takes into account the Inokuti-Hirayama model and localized donor-to-acceptor interaction solution. The original acceptor solution derived from the Inokuti-Hirayama model fits well the acceptor luminescence transient only for low-concentrated systems. The results showed that a fast excitation diffusion that occurs in a very short time (t<Tm cross relaxation and Tm-->Ho energy transfer ions from H-3(4) and F-3(4) thulium states, respectively. (C) 2004 American Institute of Physics.