The magnetically coated conducting surface as a dual conductor andits application to antennas and microwaves

An electric conducting surface coated with a thin, lossy magnetic layer has been both theoretically and experimentally observed to be equivalent to a surface that is conducting to both electric and magnetic fields of plane waves at near-grazing incidence angles. This dual conductivity phenomenon has been utilized to design horn antennas for desired performance characteristics such as symmetric beams, low sidelobes, and low cross polarization. The effects of this surface are in many ways similar to those of the corrugated conducting surface. However, this coated surface appears to have a broader spectrum of applications in other antennas and microwave devices because of its apparent dual (electric and magnetic) conductivity     

An interactive three-dimensional color graphics system

A three-dimensional image handling system is described for the interactive construction and manipulation of color images defined by polygon concatenation. The human operator, who has limited knowledge of the system, is provided interactively with a wide range of options for realizing a desired construction on a vector display. The images thus created are displayed on a color scan conversion subsystem. The specific application of this system is for the generation of three-dimensional solid forms in color with the system optimized in favor of human engineering principles.     

Revascularization of the proximal circumflex coronary artery

In complex coronary bypass procedures it is often desirable to target the left circumflex coronary distribution at a site other than the obtuse marginal and terminal branches. Reluctance to bypass into the circumflex artery in the atrioventricular groove is due to difficulty in exposure and possible injury to the coronary sinus. Herein is presented our technique for exposure and anastomosis into the proximal circumflex artery, which avoids these pitfalls. This technique has been consistently simple to perform with excellent results.     

Family members' uncertainty about parental chronic illness: the relationship of hemophilia and HIV infection to child functioning

Examined the relationships among parental and child uncertainty about fathers' illnesses and child internalizing problems. Participants included 65 families in which the father had hemophilia, approximately one half of the fathers also were HIV infected. Within each family, respondents included the father, the mother and one child. Outcome variables included both self- and parent-reported child internalizing behaviors. Results indicated that family members' illness uncertainty was intercorrelated, that child uncertainty about the father's illness predicted both anxiety and depressive symptoms in the child, and that mother's uncertainty predicted child-reported anxiety beyond the child's uncertainty.     

Detection of Bacillus globigii spores using a Fourier transform infrared-attenuated total reflection method

The use of an alumina-coated ZnSe internal reflection element (IRE) to detect spores by attenuated total reflection infrared spectroscopy (FTIR-ATR) was investigated. Two methods for coating the IRE with alumina are described. It is shown that the adsorption proceeds through an interaction of the carboxylate groups on Bacillus globigii (BG) and positively charged sites on the alumina. The amount adsorbed is highly dependent on solution pH and passes through a maximum value near pH 5, which is dictated by the charge density on the spores and the charge density on the alumina surface. Furthermore, it is shown that lateral-lateral repulsion between the spores limits the maximum adsorbed amount, giving rise to a detection limit of 10(7) spores per cm(2) of the IRE.     

Agile Methodologies: Organizational Adoption Motives,Tailoring, and Performance

Today, organizations tailor the practices from several agile methodologies to serve their particular environment. But are there situations that drive how an organization should tailor methodologies in a particular manner? This article places 12 commonly used agile development practices into a typology based upon whether they are primarily project management focused or software development approach focused and examines how organizations’ motivations for adopting agile impact the practices they adopt. Finally, it explores how a fit between an organization’s motives for agile method adoption and the tailored agile practices it adopts may lead (or not lead) to differences in project performance.     

Off-axis electron holography of magnetic nanowires and chains, rings, and planar arrays of magnetic nanoparticles

A selection of recent results illustrating the application of off-axis electron holography to the study of magnetic microstructure in closely-spaced nanoparticles and nanowires is reviewed. Examples are taken from the characterization of FeNi nanoparticle chains, Co nanoparticle rings, two-dimensional arrays of naturally occurring magnetite crystals in minerals, and single crystalline Co nanowires. Approaches that can be used to separate the magnetic signal of interest from the mean inner potential contribution to the measured holographic phase shift are described, and the spatial and phase resolution that can be achieved are discussed.