The ratio of the negative ion density to the electron density has been determined using a novel two-probe technique in the diffusion chamber of an SF6 helicon reactor. The Bohm flux (as modified by negative ions) was measured using a guarded planar probe, while the electron thermal current was obtained using a small cylindrical probe. The negative ion concentration was then determined from the ...

National Institute for Occupational Safety and Health (NIOSH) researchers continue to study the potential for lithium and lithium-ion battery thermal runaway from an internal short circuit in equipment for use in underground coal mines. Researchers conducted cell crush tests using a plastic wedge within a 20-L explosion-containment chamber filled with 6.5% CH4-air to simulate the mining hazard....

This paper introduces a new Light Aspiration device for in vivo Soft TIssue Characterization (LASTIC). This device is designed to be used during surgery, and can undergo sterilization. It provides interactive-time estimation of the elastic parameters. LASTIC is a 3cm x 3cm metallic cylinder divided in two compartments. The lower compartment is a cylindrical chamber made airtight by a glass wind...

Equations are derived for generating accumulated dose distributions and the dose line integral in a cylindrical dosimetry phantom for a helical CT scan series from the single slice dose profiles using convolution methods. This exposition will better clarify the nature of the dose distribution in helical CT, as well as providing the medical physicist with a better understanding of the physics in...

This paper presents the results of mathematical and physical modeling interaction waves with wave chamber on cylindrical supports upper part in form a permeable waterfront. On basis diffraction model refraction transformation near structure is carried out. In presence structure, co-accompanied by phenomena destruction at edges partial reflection residual from walls protective front. Reflection ...

The SOMBRERO inertial fusion reactor conceptual design produces 1000 MWe utilizing near symmetric illumination of targets by KrF laser. The blanket design optimization results in achieving an overall tritium breeding ratio of 1.25 and an overall reactor energy multiplication of 1.08. The first wall is expected to have a 5 full power year (FPY) lifetime. The shield surrounding the reactor chambe...

Abstract Designing a new construction of large-volume multi-chamber tanks or converting existing single-chamber into for storage various types petroleum products is very demanding and responsible job, from the aspect strain-stress analysis need to ensure structural integrity. From wide range conducted theoretical experimental-numerical research, this paper singles out applied method similarity ...

Abstract Convection is a phenomenon that often occurs in the presence of temperature gradients. In microgravity, free convection can not occur due to lack buoyancy. However, during parabolic flights we observed convections microparticles gas discharge within cylindrical plasma chamber setup PK-4. The and were exposed thermal gradient. There, cloud dust waves observed. Analysis by tracking micro...

an internal ballistics model has been developed for performance prediction of a solid propellant rocket motor. inthis model a 1-d unsteady euler equation with source terms is considered. the flow is assumed as a non-reacting mixture of perfect gases with space and time varying thermo physical properties. the governing equations in the combustion chamber are solved numerically by using the stege...

We comment on a recent article (Gomà et al 2014 Phys. Med. Biol. 59 4961-71) which compares different routes of reference dosimetry for the energy dependent beam monitor calibration in scanned proton beams. In this article, a 3% discrepancy is reported between a Faraday cup and a plane-parallel ionization chamber in the experimental determination of the number of protons per monitor unit. It is...