Underwater acoustic signals need transducers to generate and detect signals with high power, linearity, dynamic-range and beamwidth. Among a variety of transducer designs, a Tonpilz transducer stands out for power and long-range applications. A Tonpilz transducer for underwater acoustic signaling is developed to scale and analyzed using FEM tools with Comsol. The underlying pressure-acoustics a...

Proposed control equipment scheme is based on acoustic Helmholtz resonator property to change its resonance frequency when sound speed in the vicinity of its throat inlet is changed. So this kind of resonator with pressure measuring acoustic transducer is installed in well known Pitou probe static pressure volume envelope, slightly changing its construction. To use Pitou probe of new type, exce...

OBJECTIVE To determine if there was a relationship between intrassellar pressure (ISP) and pituitary tumor volume. METHOD Between August 2002 and May 2004, 60 patients aged between 13 and 75 years old (39 males), having a pituitary adenoma were submitted to an endoscope transseptal approach. During the surgery and before tumor resection, 2 mm of the sellas floor were removed and a 1.5 mm dura...

Due to the condition of the original material, there are unavoidable flaws in this reproduction. We have made every effort possible to provide you with the best copy available. If you are dissatisfied with this product and find it unusable, please contact Document Services as soon as possible. Author's Abstract: The basic problem is to determine whether or not a satisfactory method can be devel...

1. Anesthetics Mongrel dogs of either sex, weighing from 6 to 13 kg, were anesthetized with sodium pentobarbital 30 mg/kg i.v. and supplemented with doses of 2.5 to 5 mg/kg i.v. whenever necessary during the experiment. Cats of either sex, weighing from 2 to 4.5 kg were anesthetized with chloralose (40 mg/kg i.v.) and urethane (250 mg/kg i.v. and 250 mg/kg i.p.), unless otherwise stated. 2. Blo...

Intradiscal and intervertebral pressure transducers were developed. They were used to map the pressures in the nucleus and within the annulus of the human spinal segments. Their stressrelaxation were recorded over a period of time for nucleus pressure, applied load, and peripherial strain against time. The results show that for normal discs, pressures in the nucleus are viscoelastic in nature w...

This article presents an overview on the state of the art of Tyre Pressure Monitoring System related technologies. This includes examining the latest pressure sensing methods and comparing different types of pressure transducers, particularly their power consumption and measuring range. Having the aim of this research to investigate possible means to obtain a tyre condition monitoring system (T...

This report describes three phases of research on the direct force method of externally measuring arterial blood pressure. First, a miniaturized transducer was designed specifically for application on the superficial temporal artery of man. This device incorporateda differentialtransformer sensing element with special mounting to reduce response to acceleration. Second, a transducer of earlier ...

Many important issues in transducer arrays design, such as crosstalk, cannot be accurately studied using analytic method due to the complexity of the partial differential equations involved. Finite element method (FEM) is the only appropriate way to gain more detailed information. In this paper, a 2D finite element model is constructed to modeling the structural and acoustic behaviour of transd...

MICROBUBBLE GENERATION BY PIEZOELECTRIC TRANSDUCERS FOR BIOMEDICAL STUDIES Mohammed Alkhazal Old Dominion University, 2016 Director: Shu Xiao Bubbles induced by blast waves or shocks are speculated as the major cause of damage in biological cells in mild traumatic brain injuries (TBI). Microbubble collapse was found to induce noticeable cell detachment from the cell substrate, changes in focal ...