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Joaquim da Costa Ribeiro

Joaquim da Costa Ribeiro, Brazilian physicist (Rio de Janeiro 08 July 1906 - Rio de Janeiro 29 July 1960)
Discovered thermo-dielectric effect or Costa Ribeiro effect in 1944. The discovery was presented in session of 14 November 1944 at Brazilian Academy of Sciences and published in On the thermo-dielectric effect. Anais Acad. Bras. Ciencias 22(3):325-348, 1950. Despite the priority US physicists E.J. Workman and S.E. Reynolds discovered the same phenomenon in 1950, that was known as Workman-Reynolds effect in literature. 
Established laws about thermo-dielectric effect

Formulated equations about thermo-dielectric effect (1945) with J. Tiomno

Defined thermo-dielectric constant
Discovered electro-fusion
Electro-fusion: a new phenomenon observed in the phase changes of dielectrics under the influence of an electric field. Anais Acad. Bras. Ciencias 26(2):349-55, 1954.
Conceived a new bridge method for performing radioactivity measurements 
Sobre um método de ponte para a determinação das correntes de ionização nas medidas de radioatividade. Anais Acad. Bras. Ciencias 12(2):110-6, 1940. 
Developed a new type of autocollimator polarizing apparatus with Luigi Sobrero (1942). 
Developed an apparatus for studying photoelasticity and refringence of transparent layers precipitated on glass plates.    
Ribeirite, a variety of zircon (described by W. Florencio in 1952)