[en] Using the known realizations of the quantum algebras Aq(n), Dq(n) in terms of quantum Clifford algebra and folding procedure of Lee algebras we construct some new spinor representation of Bq(n), Cq(n), Gq(2)

[en] The bulk photovoltaic effect that arises in non centrosymmetric crystals is determined by the third rank tensor. In this work four independent components of photovoltaic tensor, responsible for 'linear' photovoltaic currents, are measured for the first time for LiTaO₃ : Fe crystals in the range of photon energy from 2.07 to 3.88 eV. The observed correlation of the spectral dependences of β₁₅ and β₂₂ components indicates common origin of the transverse photovoltaic currents in this material

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[en] A short bulletin from the National Fusion Program. Included in this issue is a report on Canada's plans to participate in the Engineering Design Activities (EDA), bilateral meetings with Canada and the U.S., committee meeting with Canada-Europe, an update at Tokamak de Varennes on Plasma Biasing experiments and boronized graphite tests, fusion materials research at the University of Toronto using a dual beam accelerator and a review of the CFFTP and the CCFM. 2 figs

[en] This work presents several actions performed by CETESB, the sanitary engineering agency of Sao Paulo State - Southeast Brazil, in what concerns the accident involving cesium-137 in Goiania, Goias State - Center Brazil. The adopted procedures are described in details

[en] Langmuir probe data obtained from about 290 Ohmic discharges in the Frascati Tokamak (FT) have been analysed in the following ranges of macroscopic plasma parameters: line averaged plasma density n-bar_e=2.5x10¹³ to 2.7x10¹⁴cm^-3, plasma current I_p=230-450 kA, toroidal magnetic field B_T=6T and 8T. The principal parameters of the scrape-off layer (SOL) plasma, i.e. the density and the temperature at the limiter radius, n_eL and T_eL, respectively, and their e-folding lengths λ_n and λ_T have been obtained and correlated with those of the main plasma. The scaling laws for n_eL and T_eL as a function of the macroscopic plasma parameters are explained only partially with the existing simple diffusion models, which cannot account for the experimentally observed dependence of n_eL on the safety factor q_L. The empirical laws are n_eL=3.96x10^-2n-bar_e^1.38q_L and T_eL=6.5(I_p/q_L)^2/3n-bar_e^-0.75, where n-bar_e and n_eL are in units of 10¹³cm^-3, T_e is in eV and I_p in kA. For λ_n, the scaling λ_n=1.05n-bar_e^-0.25cm holds, with the same units. No reliable law is derived for λ_T, but the approximate relationship λ_T approx. 2.5-4λ_n always holds true. The fluctuations in the SOL and their role in determining the perpendicular particle diffusion and, hence, λ_n are discussed. (author). 17 refs, 8 figs

[en] The ideal rectangular axial structure of the eigenfunction of the curvature driven trapped particle mode, localized in the central cell of a tandem mirror is critically examined and revised. The search for a physical damping mechanism which can truncate the short wavelength part of the spectrum of the ideal eigenfunction has led to the halo coupling of the trapped particle mode. The radial coupling of the trapped particle mode to the halo plasma can excite acoustic modes which are strongly damped at short wavelengths. This mechanism can easily smooth out the ideal rectangular structure. Approximate results indicate a significant departure from the ideal rectangular structure and a corresponding reduction of the growth rate. (author). 6 refs, 2 figs