Ions, Electrons Get Charged Up A plasma is a reactive gas consisting of ions, free electrons, free radicals, excited state species, and neutrals. A plasma can be generated at high pressure (1 atmosphere or higher) or low pressure (1 torr or less) by an electric discharge. A high-pressure plasma is created by a spark, arc, or corona discharge. The gas molecules in such a discharge are hot enough...

Article history: Received 12 May 2008 Received in revised form 25 September 2008 Available online 29 November 2008 0017-9310/$ see front matter 2008 Elsevier Ltd. A doi:10.1016/j.ijheatmasstransfer.2008.09.018 * Corresponding author. Fax: +1 203 576 4765. E-mail address: [email protected] (J. Hu). An integrated comprehensive 3D model has been developed to study the transport phenomena in gas ...

OBJECTIVE To explore a possible role for activity-regulated cytoskeleton-associated (Arc/Arg3.1) protein in the clinical identification of children with autism. SUBJECTS AND METHODS The plasma levels of Arc/Arg3.1 in 62 boys with autism and 32 healthy boys were measured using an enzyme-linked immunosorbent assay (ELISA). The Childhood Autism Rating Scale (CARS) was used to assess the severity...

Abstract Among the applied challenges associated with use of electric-arc plasma, most urgent is erosion electrodes in plasmatrons, which determine continuous operation an electric-plasma device. Investigation results on thermal state hot cathodes and their are presented depending main defining parameters, namely geometrical dimensions electrodes, Joule heating, current arc discharge, gas mediu...

background and aims. newer curing units such as plasma arc can polymerize the sealants in much shorter curing times. the aim of this study was to compare the effect of two different curing units on the micro-leakage of a fissure sealant material. materials and methods. sixty two extracted premolars without caries were randomly divided into two groups of 31 samples. occlusal surfaces of all teet...

Seed sterilization is essential for preventing seed borne fungal diseases. Sterilization tools based on physical technologies have recently received much attention. However, available information is very limited in terms of efficiency, safety, and mode of action. In this study, we have examined antifungal activity of ozone and arc discharge plasma, potential tools for seed sterilization. In our...

Plasma jets produced by direct-current (dc) non-transferred arc plasma torches, at the core of technologies ranging from spray coating to pyrolysis, present intricate dynamics due to the coupled interaction of fluid flow, thermal and electromagnetic phenomena. The flow dynamics from an arc discharge plasma jet are investigated using time-dependent three-dimensional simulations encompassing the ...

A simplified vacuum arc design [based on metal vapor vacuum arc (MeVVA) concepts] is employed as a plasma source for a study of a (7)Be non-neutral plasma. The design includes a mechanism for interchanging the cathode source. Testing of the plasma source showed that it is capable of producing on the order of 10(12) charges at confinable energies using a boron-carbide disk as the cathode target....