Business Size as a Factor in Business Leader Mobility

Author Institution: Human Resources Research Institute, Maxwell Air Force Base, Alabam

The incidence of Trichinella spiralis in the diaphragms of swine from the Louisville abattoirs.

Trichinosis is a disease caused by the parasitic nematode Trichinella spiralis. When meat containing encysted larvae is consumed the cysts are dissolved by the action of the gastric juice in the stomach and the larvae migrate to the intestine where they mature, copulate and give birth to living young within a week of the original infection. The larvae enter the lymph spaces and are carried to the thoracic duct from which they reach the venous circulation and thence the arterial circulation by way of the heart and the pulmonary capillaries. From the arterial blood the larvae enter most of the striated muscles. After entering the muscle fibers the larvae grow rapidly, become spirally coiled, and in 4 to 6 weeks a membranous capsule begins to form around each worm. If the infested host remains alive, the cyst wall usually begins to calcify in 8 to 10 months. Eventually the entire cyst becomes calcified and the larvae die. The presence of encysted trichinae larvae in the muscles of man was probably first noted by Tiedemann in 1822, although he failed to recognize their significance. John Hilton in 1833 was the first to suggest the parasitic nature, although the actual discovery of the worm was made in 1835 by James Paget who saw the calcified larvae in cadavers at St. Bartholomew’s Hospital and found upon microscopic examination that they contained a coiled roundworm. Paget’s discovery was reported by his teacher, Robert Owen, who called the parasite, Trichina spiralis

Rayleigh—Taylor-Instability Evolution in Colliding-Plasma-Jet Experiments with Magnetic and Viscous Stabilization

The Rayleigh—Taylor instability causes mixing in plasmas throughout the universe, from micron-scale plasmas in inertial confinement fusion implosions to parsec-scale supernova remnants. The evolution of this interchange instability in a plasma is influenced by the presence of viscosity and magnetic fields, both of which have the potential to stabilize short-wavelength modes. Very few experimental observations of Rayleigh—Taylor growth in plasmas with stabilizing mechanisms are reported in the literature, and those that are reported are in sub-millimeter scale plasmas that are difficult to diagnose. Experimental observations in well-characterized plasmas are important for validation of computational models used to make design predictions for inertial confinement fusion efforts. This dissertation presents observations of instability growth during the interaction between a high Mach-number, initially unmagnetized plasma jet and a stagnated, magnetized plasma. A multi-frame fast camera captures Rayleigh—Taylor-instability growth while interferometry, spectroscopy, photodiode, and magnetic probe diagnostics are employed to estimate plasma parameters in the vicinity of the collision. As the instability grows, an evolution to longer mode wavelength is observed. Comparisons of experimental data with idealized magnetohydrodynamic simulations including a physical viscosity model suggest that the observed instability evolution is consistent with both magnetic and viscous stabilization. These data provide the opportunity to benchmark computational models used in astrophysics and fusion research

Emergence of synchronisation in a driven-dissipative hot Rydberg vapor

We observe synchronisation in a thermal (35-60 {\deg}C) atomic (Rb) ensemble driven to a highly-excited Rydberg state (principle quantum number n ranging from 43 to 79). Synchronisation in this system is unexpected due to the atomic motion, however, we show theoretically that sufficiently strong interactions via a global Rydberg density mean field causes frequency and phase entrainment. The emergent oscillations in the vapor's bulk quantities are detected in the transmission of the probe laser for a two-photon excitation scheme

Emergence of Synchronization in a Driven-Dissipative Hot Rydberg Vapor

We observe synchronization in a thermal (35–60°C) atomic (Rb) ensemble driven to a highly excited Rydberg state (principle quantum number n ranging from 43 to 79). Synchronization in this system is unexpected due to the atomic motion; however, we show theoretically that sufficiently strong interactions via a global Rydberg density mean field cause frequency and phase entrainment. The emergent oscillations in the vapor’s bulk quantities are detected in the transmission of the probe laser for a two-photon excitation scheme

Study of a unified hardware and software fault-tolerant architecture

A unified architectural concept, called the Fault Tolerant Processor Attached Processor (FTP-AP), that can tolerate hardware as well as software faults is proposed for applications requiring ultrareliable computation capability. An emulation of the FTP-AP architecture, consisting of a breadboard Motorola 68010-based quadruply redundant Fault Tolerant Processor, four VAX 750s as attached processors, and four versions of a transport aircraft yaw damper control law, is used as a testbed in the AIRLAB to examine a number of critical issues. Solutions of several basic problems associated with N-Version software are proposed and implemented on the testbed. This includes a confidence voter to resolve coincident errors in N-Version software. A reliability model of N-Version software that is based upon the recent understanding of software failure mechanisms is also developed. The basic FTP-AP architectural concept appears suitable for hosting N-Version application software while at the same time tolerating hardware failures. Architectural enhancements for greater efficiency, software reliability modeling, and N-Version issues that merit further research are identified

The Feasibility of Detecting Supercooled Liquid with a Forward-Looking Radiometer

A three-dimensional radiative transfer model is utilized to determine the feasibility of a forward-viewing passive sensor for remotely detecting hazardous icing conditions. Wband ground-based radar simulations show no obvious ability to discriminate a cloud-top supercooled layer; however, the spectra for a forward-viewing passive sensor show a strong signal at two stand-off distances when compared with the clear sky spectrum. Such an instrument would be critical for manned and unmanned aircraft, particularly when size, weight, and power requirements restrict the installation of deicing equipment

Building Evaluations for Risk Assessment

Vulnerability of existing building inventory is at the heart of risk assessment. This presentation will explore data collection methodologies for documenting relevant building attributes and assessing the potential for mitigation. Specific examples of buildings and data collection platforms will be given. Further discussion will focus on collection of building inventory data for large numbers of buildings for use in Level 2 HAZUS analyses for wind and flood hazards

Building Evaluations for Risk Assessment

Vulnerability of existing building inventory is at the heart of risk assessment. This presentation will explore data collection methodologies for documenting relevant building attributes and assessing the potential for mitigation. Specific examples of buildings and data collection platforms will be given. Further discussion will focus on collection of building inventory data for large numbers of buildings for use in Level 2 HAZUS analyses for wind and flood hazards