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1.
Appl Opt ; 53(9): 1938-46, 2014 Mar 20.
Article in English | MEDLINE | ID: mdl-24663473

ABSTRACT

A tunable quantum cascade laser sensor, based on wavelength modulation absorption spectroscopy near 4.8 µm, was developed to measure CO concentration in harsh, high-pressure combustion gases. The sensor employs a normalized second harmonic detection technique (WMS-2f/1f) at a modulation frequency of 50 kHz. Wavelength selection at 2059.91 cm⁻¹ targets the P(20) transition within the fundamental vibrational band of CO, chosen for absorption strength and relative isolation from infrared water and carbon dioxide absorption. The CO spectral model is defined by the Voigt line-shape function, and key line-strength and line-broadening spectroscopic parameters were taken from the literature or measured. Sensitivity analysis identified the CO-N2 collisional broadening coefficient as most critical for uncertainty mitigation in hydrocarbon/air combustion exhaust measurements, and this parameter was experimentally derived over a range of combustion temperatures (1100-2600 K) produced in a shock tube. Accuracy of the wavelength-modulation-spectroscopy-based sensor, using the refined spectral model, was validated at pressures greater than 40 atm in nonreactive shock-heated gas mixtures. The laser was then free-space coupled to an indium-fluoride single-mode fiber for remote light delivery. The fiber-coupled sensor was demonstrated on an ethylene/air pulse detonation combustor, providing time-resolved (~20 kHz), in situ measurements of CO concentration in a harsh flow field.

2.
Rev. argent. cir. cardiovasc. (Impresa) ; 10(1): 21-30, ene-abr. 2012. graf
Article in Spanish | LILACS | ID: lil-730172

ABSTRACT

Objetivo: conocer la prevalencia de la enfermedad vascular periférica (Enfermedad Arterial Periféricay Enfermedad Cerebro Vascular extra craneana) en distintos puntos de la República Argentina, a través de una encuesta a representantes del CACCVE (Colegio Argentino de CirujanosCardiovasculares y Endovasculares).Material y métodos: mediante una encuesta que se detalla a continuación, se solicitó conocer en porcentajes distintos aspectos de los pacientes atendidos en 2009-2010 a distintos centros de atención vascular: Edad; Sexo; Grupo Étnico (Blanca, Mestiza, Criolla, Aborigen, etc.); Hábitos(Tabaquismo, Sedentarismo, Personalidad); Factores de Riesgo Asociados (Hipertensión Arterial,Diabetes, Dislipidemia, Coronariopatías, Insuficiencia Renal Crónica, Enfermedades Broncopulmonares);Estudios solicitados (Análisis Clínicos, Ecodoppler, Índice Tobillo-Brazo); Medicación (Vasodilatadores, anti agregantes, anti neuríticos y analgésicos); Estadificación (Fontaine, Rutherford, TASC, TASC II); Enfermedad Carotidea (ACAS, NASCET). Resultados: se evaluaron 9500 consultas de pacientes con patología arterial, en CABA, Pcia. Bs. As., Córdoba Capital, Ciudad de Tucumán, Ciudad de Bariloche (Río Negro) y Ciudad de Río Grande (Tierra del Fuego) Se observan diferencias con respecto a la metodología diagnóstica, manejo de factores de riesgo asociados y tratamiento médico con respecto a Guías Internacionales. Se discute sobre grupo etario sobre el que basamos nuestros tratamientos. Conclusión: en muchos aspectos se aplican guías de procedimiento internacionales, sin evaluar previamente sobre nuestras realidades, intentamos mostrar la prevalencia de la Enfermedad ArterialPeriférica considerándolo esencial para optimizar los programas de atención primaria tanto como el tratamiento médico y quirúrgico para esta enfermedad.


Objetivo: conhecer a prevalência da doença vascular periférica (Doença Arterial Periférica e Doença Cérebro Vascular extra craneana) em diferentes pontos da República Argentina, a travésde uma pesquisa realizada com representantes do CACCVE (Colégio Argentino de Cirurgiões Cardiovasculares e Endovasculares).Material e métodos: Utilizando uma pesquisa apresentada em detalhes em continuação, solicitou-se conhecer em porcentagens, diversos aspectos dos pacientes atendidos no período 2009-2010 em diferentes centros de atendimento vascular: Idade; Sexo; Grupo Étnico (Branco, Preto, Pardo, Indígena, etc.); Hábitos (Tabaquismo, Sedentarismo, Personalidade ); Fatores de Risco Associados (Hipertensão Arterial, Diabetes, Dislipidemia, Coronariopatias, Insuficiência RenalCrônica, Doenças Broncopulmonares); Exames solicitados (Análises Clínicas, Ecodoppler, Índice Tornozelo Braquial); Medicação (Vasodilatadores, antiagregantes, anti neuríticos e analgésicos); Classificação (Fontaine, Rutherford, TASC, TASC II); Doença Carotídea (ACAS, NASCET). Resultados: Avaliaram-se 9500 consultas de pacientes com patología arterial, em CABA, Província de Bs. As., Córdoba Capital, Cidade de Tucumán, Cidade de Bariloche (Rio Negro) e Cidade de Rio Grande (Terra do Fogo). Observam-se diferenças relacionadas à metodologia diagnóstica, manejo de fatores de risco associados e tratamento médico com respeito a Guias Internacionais.Discute-se sobre grupo etário no qual baseamos nossos tratamentos. Conclusão: Em muitos aspectos aplicam-se guias de procedimento internacionais, sem avaliar previamente sobre nossas realidades. Tentamos mostrar a prevalência da Doença Arterial Periféricaconsiderando-a essencial para otimizar os programas de atendimento primário como também o tratamento médico e cirúrgico para esta doença.


Objective: to collect information on the prevalence of peripheral vascular disease (Peripheral Arterial Disease and Extra-cranial Cerebrovascular Disease) in different regions of Argentina through a survey of CACCVE (Colegio Argentino de Cirujanos Cardiovasculares y Endovasculares) representatives.Material and Methods: the following survey was distributed to know the percentage of certain different criteria in the patients followed-up between 2009-2010 at different vascular centers: age; gender; ethnic group (Caucasian, Mestizos, Creole, Indigenous, etc.); Habits (Smoking,Sedentarism, Personality ); Associated Risk Factors (Arterial Hypertension, Diabetes, Dyslipidemia, Coronary Disease, Chronic Renal Failure, Bronchopulmonary Disease); Tests indicated (Clinical Laboratory, Ecodoppler, Ankle Arm Index); Medication ( vasodilators, antiagreggants, antineuritics and pain medication); Staging (Fontaine, Rutherford, TASC, TASC II); Carotiddisease (ACAS, NASCET). Results: 9,500 patients with arterial disease were followed in the city of Buenos Aires, the province of Buenos Aires, the capital city of Cordoba, city of Tucumán, City of Bariloche (Rio Negro) andCity of Rio Grande (Tierra del Fuego). Differences are seen in the diagnostic methodology, management of concomitant risk factors and medical treatment according to the internationalguidelines. Also the age group for treatment indication is taken into consideration. Conclusion: In many cases international operating guidelines are applied disregarding the local reality, we tried to indicate the prevalence of Peripheral Arterial Disease as we consider this information to be essential in order to optimize primary care programs both for the medical and surgical treatment of this disease.


Subject(s)
Humans , Health Surveys , Peripheral Arterial Disease/epidemiology , Argentina/epidemiology , Carotid Artery Diseases , Prevalence
3.
J Rheumatol ; 16(8): 1079-87, 1989 Aug.
Article in English | MEDLINE | ID: mdl-2685295

ABSTRACT

We studied 15 children using high resolution ultrasonography. In all patients, ultrasound clearly demonstrated the nature of the soft tissue abnormality; 11/15 had thickening of the common synovial sheaths surrounding extensor tendons of the fingers, 1/15 had thickening of the flexor tendons and 3/15 had abnormalities consistent with ganglion cysts. These results indicate that ultrasound is an important yet noninvasive tool in the assessment of wrist swelling in children.


Subject(s)
Edema/diagnosis , Ultrasonography , Wrist , Arthritis, Juvenile/diagnosis , Arthritis, Juvenile/pathology , Child , Child, Preschool , Diagnosis, Differential , Edema/pathology , Female , Humans , Infant , Male , Synovial Cyst/diagnosis , Tendons/pathology , Tenosynovitis/diagnosis , Tenosynovitis/pathology , Wrist/pathology
4.
J Rheumatol ; 16(5): 681-4, 1989 May.
Article in English | MEDLINE | ID: mdl-2754672

ABSTRACT

Two patients presenting with arthralgias had associated minor elevations in liver enzymes. Each patient's serum had a cytoplasmic pattern of fluorescence on HEp-2 cells which led to the detection of antimitochondrial antibodies. Liver biopsy in both patients revealed primary biliary cirrhosis. Awareness of this limited, articular presentation of primary biliary cirrhosis may result in early treatment and the potential to arrest liver damage in some patients.


Subject(s)
Arthritis/etiology , Liver Cirrhosis, Biliary/complications , Adult , Arthritis/immunology , Autoantibodies/analysis , Female , Humans , Liver Cirrhosis, Biliary/immunology , Liver Cirrhosis, Biliary/pathology , Middle Aged , Mitochondria, Liver/immunology
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