28,112 research outputs found

    Apparatus for disintegrating kidney stones

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    The useful life of the wire probe in an ultrasonic kidney stone disintegration instrument is enhanced and prolonged by attaching the wire of the wire probe to the tip of an ultrasonic transducer by means of a clamping arrangement. Additionally, damping material is applied to the wire probe in the form of a damper tube through which the wire probe passes in the region adjacent the transducer tip. The damper tube extends outwardly from the transducer tip a predetermined distance, terminating in a resilient soft rubber joint. Also, the damper tube is supported intermediate its length by a support member. The damper system thus acts to inhibit lateral vibrations of the wire in the region of the transducer tip while providing little or no damping to the linear vibrations imparted to the wire by the transducer

    Device for removing foreign objects from anatomic organs

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    A device is disclosed for removing foreign objects from anatomic organs such as the ear canal or throat. It has a housing shaped like a flashlight, an electrical power source such as a battery or AC power from a wall socket, and a tip extending from the housing. The tip has at least one wire loop made from a shape-memory-effect alloy, such as Nitinol, switchably connected to the electrical power source such that when electric current flows through the wire loop the wire loop heats up and returns to a previously programmed shape such as a curet or tweezers so as to facilitate removal of the foreign object

    Measuring the hydrostatic mass bias in galaxy clusters by combining Sunyaev-Zel'dovich and CMB lensing data

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    The cosmological parameters prefered by the cosmic microwave background (CMB) primary anisotropies predict many more galaxy clusters than those that have been detected via the thermal Sunyaev-Zeldovich (tSZ) effect. This tension has attracted considerable attention since it could be evidence of physics beyond the simplest őõ\LambdaCDM model. However, an accurate and robust calibration of the mass-observable relation for clusters is necessary for the comparison, which has been proven difficult to obtain so far. Here, we present new contraints on the mass-pressure relation by combining tSZ and CMB lensing measurements about optically-selected clusters. Consequently, our galaxy cluster sample is independent from the data employed to derive cosmological constrains. We estimate an average hydrostatic mass bias of b=0.26¬Ī0.07b = 0.26 \pm 0.07, with no significant mass nor redshift evolution. This value greatly reduces the tension between the predictions of őõ\LambdaCDM and the observed abundance of tSZ clusters while being in agreement with recent estimations from tSZ clustering. On the other hand, our value for bb is higher than the predictions from hydro-dynamical simulations. This suggests the existence of mechanisms driving large departures from hydrostatic equilibrium and that are not included in state-of-the-art simulations, and/or unaccounted systematic errors such as biases in the cluster catalogue due to the optical selection.Comment: 4 pages, 3 figure

    Welfare, inequality and financial consequences of a multi-pillar pension system. A reform in Peru.

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    The distributional impact of the structural pension reform in Latin American countries has been largely absent in the economic debate. However, this reform may widen inequality in old‚Äźage and reduce welfare. In this paper we study the consequences of implementing a multi‚Äźpillar system in one of these countries. We take advantage of available administrative records for Peruvian workers to estimate inequality in pensions, pension debt and welfare. Overall, our results show that the pension debt and inequality can be substantially reduced without welfare losses. Thus, the proposed multi‚Äźpillar system allows recovering the principle of solidarity and saves fiscal resources.Pension reform; Pension inequality; Social security; Latin America; Peru;
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