Multifunctional polyhedral oligomeric silsesquioxane (POSS)-reinforced polypropylene (PP) nanocomposites were prepared by a simple and economical radiation processing, which has a great potential for the preparation of high performance materials. The tensile strength of PP/POSS nanocomposites increased with an increasing POSS content up to 5 wt% and with an increasing absorption dose up to 50 k...

Targeted radiation therapy (RT) is a central component of cancer treatment in both the radical and palliative settings. A central and compelling feature of RT is its capacity to deliver a therapeutic effect for cancerous targets that lie deep within the body. Full exploitation of this effect has been limited by the clinical uncertainties in identifying the geometric boundaries of the target and...

multileaf collimator (mlc) is among the radiation field shaping systems used for conformal radiotherapy and intensity modulation radiation therapy techniques. the mlc system that has been designed and fabricated in this study includes 52 leaves, 52 stepper motors, 2 dc motors, 16 programmable logic controllers (plcs) and one human machine interface (hmi). this system can be mounted on conventio...

There are several natural polymers such as carrageenan, alginate, chitin or chitosan that are classified as polysaccharides. One of the most promising is chitosan, deacetylated derivative of chitin, produced from shellfish wastes or fungi [15]. Irradiation of this polymer led the reduction of molecular weight by scission of glycosidic linkage. As compared to the conventional techniques, like ac...

Considerable effort has been put into characterizing the ionic composition of fogs and clouds over the past twenty-five years. Recently it has become evident that clouds and fogs often contain large concentrations of organic material as well. Here we report findings from a series of studies examining the organic composition of radiation fogs in central California. Organic compounds in these fog...

Radiotracers and nucleonic gauges are increasingly being applied by the mining, metallurgy and mineral processing industries for the exploration and efficient extraction of natural resources. Such industries exist in most countries and are often major contributors to national economies. Radiotracers are excellent tools for deriving data in a simple manner from a variety of complex and closed fl...

Funded by the NASA New Millennium Program (NMP) Space Technology 8 (ST8) project since 2004, the Dependable Multiprocessor (DM) project is a major step toward NASA’s long-held desire to take advantage of high-performance, Commercial-Off-The-Shelf (COTS) technology in onboard processing solutions for space applications. A DM system is a cluster of high-performance COTS processors connected with ...

background: recently, there have been many studies on the harmful effects of radiation and the regulations on radiation safety have been toughened both at the in nation and abroad. this study aims to identify the perceptions and actions taken as to radiation safety, and the degree of knowledge related to radiation held by the radiologists working in large hospitals. materials and methods: the r...

In this paper we will discuss an innovative optical system for solar power applications in space. In this system solar radiation is collected by the concentrator array which transfers the concentrated solar radiation to the optical waveguide (OW) transmission line made of low loss optical fibers. The OW transmission line directs the solar radiation to the place of solar power utilization such a...