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R Onofrio

Publications and source records attributed to R Onofrio.

14 recordsLinked to original sources
PubMed2002

Measurement of the Casimir force between parallel metallic surfaces.

We report on the measurement of the Casimir force between conducting surfaces in a parallel configuration. The force is exerted between a silicon cantilever coated with chromium and a similar rigid surface and is detected by looking at the shifts induced in the cantilever frequency when the latter is approached. The scaling of the force with the distance between the surfaces was tested in the 0.5-3.0 microm range, and the related force coefficient was determined at the 15% precision level.

Journal Article↗
PubMed2000

Observation of superfluid flow in a bose-einstein condensed Gas

We have studied the hydrodynamic flow in a Bose-Einstein condensate stirred by a macroscopic object, a blue-detuned laser beam, using nondestructive in situ phase contrast imaging. A critical velocity for the onset of a pressure gradient has been observed, and shown to be density dependent. The technique has been compared to a calorimetric method used previously to measure the heating induced by the motion of the laser beam.

Journal Article↗
PubMed2000

Surface excitations of a bose-einstein condensate

Surface modes in a Bose-Einstein condensate of sodium atoms have been studied. We observed excitations of standing and rotating quadrupolar and hexadecapolar modes. The modes were excited with high spatial and temporal resolution using the optical dipole force of a rapidly scanning laser beam. This novel technique is very flexible and should be useful for the study of rotating Bose-Einstein condensates and vortices.

Journal Article↗
PubMed1978

Clinical aspects of granulomatous orchitis.

Granulomatous orchitis can present in a variety of forms varying from acute to chronic. Clinically, testicular neoplasm is usually diagnosed and radical orchiectomy is performed, with the correct diagnosis being made on microscopic examination. In this article 6 cases of granulomatous orchitis are presented, with a variety of clinical presentations varying from acute to the more chronic forms.

Adult↗