Our analysis' 1 ' has shown that there exist sensitive and insensitive regions to determine the spin (J = 2 or 4) of £(2230) in the general helicity formalism. Whereas it just falls into the insensitive region by using current data of £. If the number of events is not sufficient it is difficult'to determine the spin of £' 3 '. In this paper we generalize the moment analysis' 3 '. We define the photon angular distribution HJ [$T,LM) for the moment of process e + +&~ -» J/ip ->7 + (,(-»p + p and the weighted moment by choosing appropriate weight function. They provide an effective criterion to determine the spin of £. We also use the method to discuss i/E puzzle for process e+ + e" -J/tl> -> 7 + B, B -> Pl + p 2 + p 3 .

Resume. L'etude par calorimetrie differentielle SOUS des pressions allant jusqu'a 3 000 bar du chlorure de tertiobutyle disperse au sein d'&r"sions, permet, pour des echantillons de faibles volumes de situer dans un diagramme pression-temperature le domaine d'existence des phases solides 111-11-1. On deduit de ces rirsultats les variations de volumes molaires aux transformations entre phases.Abstract. From the study by differential thermal analysis under high pressure (up to 3000 bar) of t-butyl chloride dispersed within emulsions, the volume of the drops being a few cubic micrometers, it has been possible to determine experimentally the domain on the P-T phase diagram where the three solid phases I, 11, 111, exist. From the results obtained the changes of molar volume between phases have been deduced.

Discharges in the thin shell reversed field pinch (RFP) device EXTRAP T2R without active feedback control are characterized by growth of non-resonant m = 1 unstable resistive wall modes (RWMs) in agreement with linear MHD theory. Resonant m = 1 tearing modes (TMs) exhibit initially fast rotation and the associated perturbed radial fields at the shell are small, but eventually TMs wall-lock and give rise to a growing radial field. The increase in the radial field at the wall due to growing RWMs and wall-locked TMs is correlated with an increase in the toroidal loop voltage, which leads to discharge termination after 3-4 wall times. An active magnetic feedback control system has been installed in EXTRAP T2R. A two-dimensional array of 128 active saddle coils (pair-connected into 64 independent m = 1 coils) is used with intelligent shell feedback control to suppress the m = 1 radial field at the shell. With feedback control, active stabilization of the full toroidal spectrum of 16 unstable m = 1 non-resonant RWMs is achieved, and TM wall locking is avoided. A three-fold extension of the pulse length, up to the power supply limit, is observed. Intelligent shell feedback control is able to maintain the plasma equilibrium for 10 wall times, with plasma confinement parameters sustained at values comparable to those obtained in thick shell devices of similar size.

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