Measurement of gross alpha, gross beta activities and cosmogenic beryllium-7 (7Be) concentrations were made both daily and weekly during the years 2001--2004 from samples of atmospheric aerosols filtered from the air at Tehran Nuclear Research Center (35 41' N) and Zahedan (28 29' N). Weekly aerosol samples collected with the high-volume air samplers on cellulose filters were used to determine ...

................................................................................................................................... v CHAPTER 1 GENERAL INTRODUCTION ................................................................................ 1 1.1 Background ........................................................................................................................... 1 1.2 Moti...

Binders based on a mixture of epoxy oligomers modified with polyarylsulfones controlled deformation-strength properties have been developed. Using the stepwise curing mode, fiberglass and microplastics increased tensile strength were obtained.

The peel resistance of four adhesives (“J-B Weld” by J-B Weld (adhesive A) , 3M Scotch-Weld DP 125 Gray (adhesive B), Loctite PL Premium (3x) Construction Adhesive (adhesive C), and Henkel Hysol EA9394 (adhesive D)) is investigated for their bonding performance of a styreneethylene/butylene-styrene– carbon black (SEBS-CB) composite membrane used in structural health monitoring (SHM) application...

Work in confined spaces continues to present hazards to workers. The magnitude of this problem was recently addressed by the Occupational Safety and Health Administration in its Final Rule for "Permit-Required Control Spaces for General Industry" (29 CFR Parts 1910). Although illness and injury are typically due to asphyxiation, explosion, and drowning, toxic exposures also are an important ris...

A low-profile modified inverted-A shape patch antenna for multi-band operations is designed, fabricated and analyzed. The proposed antenna has 20x20 mm radiating patch fed by 4 mm long microstrip line on 1.6 mm thick fiberglass polymer resin dielectric material substrate and a reduced ground plane. The proposed antenna is designed and simulated by using market available 3-dimensional high frequ...

A previous paper [Applied Acoustics 66, pp.709-730, 2005] has shown that adding a quadratic residue diffuser (QRD) to the top of a T-shape barrier can provide better barrier performance than an equivalent purely absorptive barrier. In here, we extend the study to look at the performance when a QRD is made absorptive. This paper presents an investigation on the acoustic performance of a few well...

This study evaluate the use of bovine teeth as a substitute for human teeth on fracture strength tests of composite fixed partial dentures (Cpd), with and without fiberglass reinforcement (Fg). Eighty teeth were selected, being 40 bovine incisors, 20 human premolars and 20 molars. Bovine incisors were ground to get a platform, simulating an occlusal surface of human molar. Teeth in pairs were e...

Hand scaling is a physically demanding task responsible for numerous overexertion injuries in underground mining. Scaling requires the miner to use a long pry bar to remove loose rock, reducing the likelihood of rock fall injuries. The experiments described in this article simulated "rib" scaling (scaling a mine wall) from an elevated bucket to examine force generation and electromyographic res...