We have examined the static and dynamic electromechanical responses of PZT–brass (piezoelectric–nonpiezoelectric) plate unimorphs of various brass/PZT thickness ratios. The study was performed both experimentally and theoretically. The static measurements showed that, given a PZT layer thickness, there exists a brass/PZT thickness ratio that gives the unimorph the highest static displacement un...

A sintered hydroxyapatite (HAP) ceramic for use in wear studies was prepared from a commercial tricalcium phosphate. The sintered HAP had physical properties close to those of human enamel. The coefficient of friction and wear of the sintered HAP ceramic as characterized by tangential force, track width, and surface failure data, approximated those of human enamel.

as A regional social worker for the Spastics Society I am increasingly aware of the diversity of my clients' needs, their dependence for facilities on specific geographical areas and the way local authorities interpret the statutory provisions. The knowledge that spasticity is irreversible makes an immediate impact. However I try I know I cannot change the status quo and this is the premise on ...

facilitate their treatment, has been used by authors to arrange material in books, and by museums to arrange displays and catalogues. Within most general classifications of musical instruments, a class of 'brass instrument' accommodates all instruments in which sound is generated by the player applying their lips to the instrument and blowing in such a way that the lips vibrate and admit an int...

Hydroxyapatite (HA) has been used clinically to treat bone defects. However, modifications of the surface properties of HA could improve and control bone matrix deposition and localized host tissue integration. The aim of this study was to investigate the effect of developing a surface charge on HA discs with respect to osteoblast activity in vitro. HA discs (12 mm x 2 mm) were sintered in eith...

Abstract We discuss first results from hidden photon dark matter searches made with a prototype of the Broadband Radiometric Axion/ALPs Search Setup (BRASS-p) in range particle mass 49.63 μeV to 74.44 (frequency 12 GHz 18 GHz). The conceptual design BRASS and detailed description its present prototype, BRASS-p, are given, view potential application such setups photon, axion, axion-like (ALP) us...

This study concerns effects on water-borne lead from combinations of chlorine (CL) or chloramines (CA) with fluosilicic acid (FSA) or sodium fluoride (NaF). CL is known to corrode brass, releasing lead from plumbing devices. It is known that CA and CL in different ratios with ammonia (NH) mobilize copper from brass, which we have found also enhances elution of lead from leaded brass alloys. Pha...

Cobalt ferrite is a ferrimagnetic magnetostrictive ceramic that has potential application in magnetoelastic and magnetoelectric transducers. In this work, CoFe(2)O(4) was obtained using a conventional ceramic method and Bi(2)O(3) was used as additive in order to obtain liquid-phase sintered samples. Bi(2)O(3) was added to the ferrite in amounts ranging from 0.25 mol% to 0.45 mol% and samples we...

Sintered Halon G-80, a polytetrafluoroethylene (PTFE) resin available commercially in powdered form, is a superb diffuse reflector. Sintered Halon has > 96% absolute reflectance at wavelengths between 300 nm and 380 nm, and about 98% absolute reflectance above 380 rim. It is chemically inert, is mechanically strong, does not fluoresce, and the high reflectance is e&~y to maintain over time. We ...

Some years ago I visited M. F. Perutz, the Cambridge biochemist who deciphered the structure of the hemoglobin molecule. Professor Perutz showed me a series of artifacts from his 20-year struggle to unravel the twists and folds of the oxygen-carrying protein. There was an x-ray diffraction film whose symmetrical array of dots looked like a lace doily, a contour map of electron density drawn on ...