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1.
Spectrochim Acta A Mol Biomol Spectrosc ; 210: 245-250, 2019 Mar 05.
Article in English | MEDLINE | ID: mdl-30458392

ABSTRACT

In this paper, we describe in detail an assembled open-path optical cavity to act as a temperature sensor of air. A metal absorption cell in a temperature-regulated tube furnace is placed at the center of an optical cavity. The optical cavity consists of two mirrors, two nitrogen buffer sleeves, and the open cell. The air is injected through a fitting in one extreme of the metal tube and travels half the tube length through a channel in the wall of the tube. The channel directs the air towards the center of the cell. The air flowing is heated at the temperature of the metal tube in contact with the furnace. The heated air injected at the center of the tube, flows towards the open extremes of the tube. The nitrogen buffer sleeves protect the mirrors from the heated air. The temperature of the air flowing through the tube is determined by measuring the absorption of the A band of oxygen as a function of the wavenumber in the 769-755 nm wavelength range. The absorption technique is phase-shift cavity ring down spectroscopy. To obtain the temperature, the energy of the lower rotational state for eleven selected rotational transitions is linearly fitted to a logarithmic function that contains the relative intensity of the rotational transition, the initial and final rotational quantum numbers and the energy of the transition. Accuracy of the measurement is determined by comparing the calculated temperature from the spectra with the analog reading of the temperature-regulated tube furnace. This technique is proposed for exhaust air temperature measurements of combustion chambers and cooling air after passing through the blades of a turbine.

2.
Rev. cuba. med. mil ; 3(1): 3-11, mar. 1984. ilus, tab
Article in Spanish | CUMED | ID: cum-25321

ABSTRACT

Se describe la técnica, resultados y comentarios de la hemodiálisis iterada con riñon artificial, utilizando la fístula arteriovenosa con vena safena interna subcutánea, según una modificación de las técnicas clásicas. Se realizaron 84 hemodiálisis en un périodo de 8 meses. se señala la facilidad de la técnica y su eficacia(AU)


Subject(s)
Renal Dialysis/methods , Kidneys, Artificial , Arteriovenous Fistula , Saphenous Vein/abnormalities
3.
Rev. cuba. med. mil ; 1(1): 89-100, ene.1982. ilus
Article in Spanish | CUMED | ID: cum-25262

ABSTRACT

Se estudiaron 80 pacientes con síndrome de la salida torácica. Se empleo como medios diagnósticos además de la clínica, las angiografías, la velocidad de conducción nerviosa y el estudio Doopler. La flebografía y el Doopler resultaron muy útil. Se operaron 45 por vía anterior, axilar y posterior. La escalenotomía no resuelve la compresión, siendo necesario la resección de 1ra, costilla, la vía que hay que individualizarla. En los militares, con esta patología hay que valorar individualmente el grado de aptitud(AU)


Subject(s)
Humans , Male , Female , Thoracic Outlet Syndrome/diagnosis , Thoracic Outlet Syndrome/surgery , Military Personnel
4.
Rev. cuba. med. mil ; 1(Extra): 45-56, 1982. ilus
Article in Spanish | CUMED | ID: cum-25288

ABSTRACT

De 1964 a Agosto 1979 se operaron 102 pacientes de traumatismos y enfermedades vasculares en el cuello, en los Hopitales Militares Centrales de La Habana, hubo 10 fallecidos. Se exponen los aspectos fundamentales de vías de acceso, técnicas, medidas de protección cerebral y cuidados trans y post operatorios que permitieron una buena evolución. Durante ese período se realizaron 26 trabajos científicos de divulgación y enseñanza de la cirugía vascular del cuello(AU)


Subject(s)
Neck/surgery , Vascular Diseases , Neck Injuries , Postoperative Care
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