The color of polarization in cuprate superconductors

A technique for the identification of individual anisotropic grains in a heterogeneous and opaque material involves the observation of grain color in reflected light through crossed polarizers (color of polarization). Such colors are generally characteristic of particular phases. When grains of many members of the class of hole carrier cuprate superconductors are so viewed, using a xenon light source (600 K color temperature), a characteristic color of polarization is observed. This color was studied in many of these cuprate superconductors and a strong correlation was found between color and the existence of superconductivity. One of the members of the electron carrier cuprate superconductors (Nd(1.85)Ce(.15)CuO(4-x) was examined and found that it possesses the same color of polarization as all the electron hole carrier cuprate superconductors so far examined. The commonality of the characteristic color in the cuprate superconductors indicated that the presence of this color is independent of the nature of charge carriers. The correlation of this color with existence of superconductivity suggests that the origin of the color relates to the origin of superconductivity in the cuprate superconductors. Photometric techniques are also discussed

Technology entrepreneurship: creating, capturing, and protecting value

xxvii+562hlm.;24c

The Cashflow Quadrant : Panduan Ayah Kaya Menuju Kebebasan Finansial

viii + 330 hlm.; ilus.; 21 cm

Manejo endovascular en pacientes con síndrome de compresión iliocava: experiencia en 17 casos Endovascular treatment in patients with iliocaval compression syndrome: experience in 17 cases

Objetivo: reportar la experiencia del manejo endovascular en pacientes con síndrome de compresión iliocava. Materiales y métodos: durante tres años se evaluaron 84 pacientes con sospecha de compresión iliocava, cuyo diagnóstico se confirmó mediante flebografía ascendente e Iliocavografía. Se trataron 17 pacientes por vía endovascular, terapia de anticoagulación y seguimiento radiológico seriado. Resultados: en un total de 17 pacientes con edad promedio de 43 años, se observó mejoría clínica completa en 88%, parcial en 6% y ninguna en 6%. Permeabilidad del stent en 94,12% a 36 meses. Conclusión: la terapia endovascular muestra excelente permeabilidad y baja morbilidad en el tratamiento de pacientes con síndrome de compresión iliocava.Objective: to report our experience in the intravascular management in patients with iliocaval compression syndrome. Material and methods: 84 patients with suspicion of iliocaval compression were evaluated during a three years period. This diagnosis was confirmed by ascendant phlebography and iliocavography. 17 patients received endovascular treatment, anticoagulants and serial radiological follow-up. Results: from 17 patients with mean age of 43 years, 88% had a complete clinical recovery; it was partial in 6% and absent in 6%. Stent’s patency was 94.12% after 36 months. Conclusion: endovascular therapy shows excellent patency and low morbidity in the treatment of patients with iliocaval compression syndrome