Abstract: The present invention provides composite particles which have magnetism and simultaneously emit fluorescence with a variety of wavelengths, and which are suitable for use in the fields of biology, biochemistry or the like. The composite particles of the present invention comprise ferromagnetic iron oxide particles, fluorescent pigment particles and silica, and have an average particle size of 1 to 10 ?m, a coercive force of 2.39 to 11.94 kA/m (30 to 150 oersted), saturation magnetization of 0.5 to 40 A.m2/kg (0.5 to 40 emu/g). The peak value of the wavelength of fluorescence from the composite particle is in the range of 350 to 750 nm, when the composite particle is excited by light with a wavelength of 250 to 600 nm.

Abstract: The present invention provides composite particles which have magnetism and simultaneously emit fluorescence with a variety of wavelengths, and which are suitable for use in the fields of biology, biochemistry or the like. The composite particles of the present invention comprise ferromagnetic iron oxide particles, fluorescent pigment particles and silica, and have an average particle size of 1 to 10 ?m, a coercive force of 2.39 to 11.94 kA/m (30 to 150 oersted), saturation magnetization of 0.5 to 40 A.m2/kg (0.5 to 40 emu/g). The peak value of the wavelength of fluorescence from the composite particle is in the range of 350 to 750 nm, when the composite particle is excited by light with a wavelength of 250 to 600 nm.

Abstract: A method is provided to braze aluminum materials to each other, the method comprising a step of producing a fluoride gas-containing atmosphere within a brazing oven. The method further comprises a step of brazing the aluminum materials, by heating said materials within said atmosphere melts. The fluoride gas-containing atmosphere is produced in the soldering oven: by introducing an inert gas and the fluoride gas through different passages; by introducing into the oven a mixture of the inert gas and the fluoride gas; or by heating a fluoride in a receptacle which is placed in the oven so as to gasify the fluoride within the oven.

Abstract: An aluminum capacitor plate for use in an electrolytic capacitor, the capacitor plate including a sponge-like layer in its surfacial portion, the layer including a plurality of projections projecting inward and outward, the projections individually having heights of not higher than 1 .mu.m on average; and a titanium film having accumulated titanium particles each including projections having heights of not higher than 1 .mu.m, wherein the titanium particles are unevenly distributed in the film with a number of pores interposed therebetween.