Development of a stereofluoroscopy system

A technique of 3-D video imaging, was developed for use on manned missions for observation and control of remote manipulators. An improved medical diagnostic fluoroscope with a stereo, real-time output was also developed. An explanation of how this system works, and recommendations for future work in this area are presented

Parasitic Hymenoptera as Forensic Indicator Species

Necrophagous insects are the most important ecological evidence associated with a decomposing corpse. Insects provide insight into estimating the post-mortem interval (PMI), assessing whether a corpse has been moved, use in toxicological analyses, and provide utility in surveillance and as sniffer systems. Necrophagous Diptera are regarded as the most important forensic indicator species, largely because they colonize a corpse within minutes of death. Other types of carrion-inhabiting insects also offer value, although more limited than flies, to forensic investigations. Perhaps, the most neglected of these groups is the parasitic Hymenoptera, a group comprising several species that utilize necrophagous flies as natural hosts. Parasitic wasps extend the PMI window to include the period of time after necrophagous flies have emerged to when a corpse is discovered. Wasp host preferences and seasonal occurrences can reveal if a body was moved from another location prior to discovery. Foraging behavior of adults can be used to locate concealed bodies and potentially aid in combating entomological terrorism agents. Presently, the full potential of parasitic Hymenoptera as alternate forensic indicator species has not been explored. This chapter relates the life history characteristics of parasitic wasps to their potential usefulness in forensic applications

Implementation of a stereofluoroscopic system

Clinical applications of a 3-D video imaging technique developed by NASA for observation and control of remote manipulators are discussed. Incorporation of this technique in a stereo fluoroscopic system provides reduced radiation dosage and greater vision and mobility of the user

Exactly solvable model of the 2D electrical double layer

We consider equilibrium statistical mechanics of a simplified model for the ideal conductor electrode in an interface contact with a classical semi-infinite electrolyte, modeled by the two-dimensional Coulomb gas of pointlike $\pm$ unit charges in the stability-against-collapse regime of reduced inverse temperatures $0\le \beta<2$. If there is a potential difference between the bulk interior of the electrolyte and the grounded interface, the electrolyte region close to the interface (known as the electrical double layer) carries some nonzero surface charge density. The model is mappable onto an integrable semi-infinite sine-Gordon theory with Dirichlet boundary conditions. The exact form-factor and boundary state information gained from the mapping provide asymptotic forms of the charge and number density profiles of electrolyte particles at large distances from the interface. The result for the asymptotic behavior of the induced electric potential, related to the charge density via the Poisson equation, confirms the validity of the concept of renormalized charge and the corresponding saturation hypothesis. It is documented on the non-perturbative result for the asymptotic density profile at a strictly nonzero $\beta$ that the Debye-H\"uckel $\beta\to 0$ limit is a delicate issue.Comment: 14 page

Realistic Air Filter Media Performance Simulation. Part I: Navier-Stokes / Finite-Volume CFD Procedures

A review of published studies of numerical techniques for air filter performance simulation shows that there are two general approaches to such simulations. One describes gases flowing through filter media as continuous fluids, influenced by themacro properties viscosity, density, and pressure. The alternate approach treats gases as molecules in random motion, impacting their own kind and solid surfaces on a micro-scale. The appropriate form for a given filter medium and operating condition depends on the gas properties and the Knudsen number (Kn) of the smallest fibers in the filter medium simulated. When no fiber Kn exceeds 0.01, the Navier-Stokes equation and finite-volume solutions should simulate filter media pressure drop and particle capture reliably, if correct particle and fiber boundary conditions, including "slip" at boundaries, are employed. In addition, fibrous media geometry must be modeled in enough detail to make simulation results match experimental data. Part I of this study reviews literature related to filter media flow and particle-capture simulation in the continuum regime using the finite-volume method for flow calculations; appropriate boundary conditions and parameter values are suggested. Part II discusses media simulation in flow regimes where other equations and computation techniques must be use