586 research outputs found
Application of cathodoluminescence microscopy to the study of native acceptors in gallium antimonide
Cathodoluminescence in the scanning electron microscope is used to ivestigate growth and prosess induced defects in GaSb crystals. In particular, luminescence emission has been used to study the nature of acceptor defects present after different annealing and irradiation treatments
Experimental investigation of a quantum heat engine powered by generalized measurements
Generalized measurements may allow the control of its invasiveness on the
quantum system interpolating from a very weak to strong projective action. Such
a measurement can fuel a quantum heat engine or extract work depending on the
system-meter interaction. Here, we performed a proof-of-concept experiment
using Nuclear Magnetic Resonance techniques to investigate a spin quantum heat
engine driven by non-selective generalized (weak) measurements without feedback
control. Our prototype of a quantum thermal device operates with a measurement
protocol and a single heat bath. The protocol is composed of two non-selective
measurement channels with variable measurement strengths, one dedicated to
fueling the device (analogous to a hot heat source) and the other committed to
work extraction. The experimental results highlight that this kind of quantum
thermal device can reach unit efficiency with maximum extracted power by
fine-tuning of the measurement strengths.Comment: 8 pages, 6 figure
Test de activación de basófilos en el diagnóstico de alergia a medicamentos
In this paper we study the reliability of the basophil activation test (BAT) in the "in-vitro" diagnosis of allergy to betalactams and to metamizol, and the sensitivity and specificity of the technique are analyzed. To this end, we studied 58 patients allergic to betalactam antibiotics with a positive cutaneous test facing any derivative of penicillin and 30 healthy controls who tolerated betalactams, and 26 patients allergic to metamizol with an immediate reaction and 30 healthy controls who tolerated the medicine. Sensitivity to BAT in allergy to betalactams was 52.8%, and specificity was 92.6%. For metamizol, sensitivity was 42.3% and specificity was 100%. The positive predictive value of BAT in allergy to betalactams was 18.9% and the negative predictive value was 98.4%. For metamizol, the positive predictive value of the technique was 100% and the negative predictive value was 99.4%. The joint use of BAT and CAP (specific IgE) makes it possible to diagnose some 65% of patients allergic to betalactams. The combined use of cutaneous tests and BAT in allergy to metamizol detects 70% of the cases. BAT is a useful, non-invasive technique in the "in-vitro" diagnosis of allergy to betalactams and metamizol
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