Resultados de Búsqueda por Autor

artículo

The impact of the Hunga Tonga–Hunga Ha’apai volcanic eruption on the Peruvian atmosphere: from the sea surface to the ionosphere

Publicado por
Pacheco, Edgardo E., Velasquez, J. P., Flores, R., Condori, L., Fajardo, G., Kuyeng, Karim, Scipión, Danny, Milla, M., Conte, J. F., Poblet, F. L., Chau, J. L., Suclupe, J., Rojas, R., Manay, E.

Publicado 2024

Enlace

The eruption of the Hunga Tonga Hunga Ha’apai volcano on 15 January 2022 significantly impacted the lower and upper atmosphere globally. Using multi-instrument observations, we described disturbances from the sea surface to the ionosphere associated with atmospheric waves generated by the volcanic eruption. Perturbations were detected in atmospheric pressure, horizontal magnetic field, equatorial electrojet (EEJ), ionospheric plasma drifts, total electron content (TEC), mesospheric and lower thermospheric (MLT) neutral winds, and ionospheric virtual height measured at low magnetic latitudes in the western South American sector (mainly in Peru). The eastward Lamb wave propagation was observed at the Jicamarca Radio Observatory on the day of the eruption at 13:50 UT and on its way back from the antipodal point (westward) on the next day at 07:05 UT. Perturbations in the horizontal compon...

artículo

Design, calibration, and performance of the MINERvA detector

Publicado por
Aliaga L., Bagby L., Baldin B., Baumbaugh A., Bodek A., Bradford R., Brooks W.K., Boehnlein D., Boyd S., Budd H., Butkevich A., Martinez Caicedo D.A., Castromonte C.M., Christy M.E., Chvojka J., Da Motta H., Damiani D.S., Danko I., Datta M., Devan J., Draeger E., Dytman S.A., Díaz G.A., Eberly B., Edmondson D.A., Felix J., Fields L., Fiorentini G.A., Flight R.S., Gago A.M., Gallagher H., George C.A., Gielata J.A., Gingu C., Gran R., Grange J., Grossman N., Harris D.A., Heaton J., Higuera A., Hobbs J.A., Howley I.J., Hurtado K., Jerkins M., Kafka T., Kantner M.O., Keppel C., Kilmer J., Kordosky M., Krajeski A.H., Kumbartzki G.J., Lee H., Leister A.G., Locke G., Maggi G., Maher E., Manly S., Mann W.A., Marshall C.M., McFarland K.S., McGivern C.L., McGowan A.M., Mislivec A., Morfín J.G., Mousseau J., Naples D., Nelson J.K., Niculescu G., Niculescu I., O'Connor C.D., Ochoa N., Olsen J., Osmanov B., Osta J., Palomino J.L., Paolone V., Park J., Perdue G.N., Peña C., Pla-Dalmau A., Rakotondravohitra L., Ransome R.D., Ray H., Ren L., Rubinov P., Rude C., Sassin K.E., Schellman H., Schmitz D.W., Schneider R.M., Schulte E.C., Simon C., Snider F.D., Snyder M.C., Solano Salinas C.J., Tagg N., Tice B.G., Tilden R.N., Velásquez J.P., Walton T., Westerberg A.

Publicado 2014

Enlace

The skin is the largest organ of the body that protects it from the external environment. High- frequency ultra sound (HF-US) has been used to visualize the skin in depth and to diagnose some pathologies in dermatological applications. Quantitative ultrasound (QUS) includes several techniques that provide values of particular physical properties. In this thesis work, three QUS parameters are explained and used to characterize healthy skin through HF-US: attenuation coefficient slope (ACS), backscatter coefficient (BSC) and shear wave speed (SWS). They were estimated with the regularized spectral-log difference (RSLD) method, the reference phan- tom method, and the crawling wave sonoelastography method, respectively. All the three parameters were assessed in phantoms, ex vivo and in vivo skin. In calibrated phantoms, RSLD showed a reduc- tion of up to 93% of the standard deviation concern...