Braided Type Research Articles

Preliminary studies of intertidal sand bodies in the Minas Basin, Bay of Fundy, Nova Scotia

Sand winnowed from bay-floor deposits and eroded from sea cliffs in the Minas Basin has been swept into a series of intertidal sand-body complexes. Continuous seismic profiles show that these are plano-convex or tabular sand masses up to 30 m thick and 30 km long. Two types of complex are present: the Windsor Bay complex is a tidal delta type, while the Cobequid Bay complex represents a braided type. The Windsor Bay complex consists of a main channel, flanked by two levee-like lateral bars, capped by a lunate cross-bar. The complex is localized by the phase difference between the retarded estuary tide and the tide of the main bay. The Cobequid Bay complex consists of rhomboid to oval bars, whose blunt ends face the incoming tide, which are defined by interlacing channels.Tidal current velocity data measured over the complex indicate two regimes: a high-water, sheet-flood phase and a low-water, channel phase. On the surface of the bars, first-order sandwaves show mainly flood asymmetry while second-order sandwaves show mainly ebb asymmetry. The flood asymmetry of the bars and larger sandwaves is a consequence of the skewed nature of the tidal cycle. Sand transport in the Minas Basin appears to be eastward, along both shores.

Flexible Radio Frequency Bonding Configurations: Theoretical Analysis, Measurements, and Practical Applications

This report was prompted by many questions relative to flexible bonding configurations and their effectiveness at high radio frequencies (RF). Tests were conducted primarily to compare the impedances of various flexible bonding configurations and to gain a better insight into RF bonding characteristics. Test samples were company-fabricated solid flat straps, commercially available braid types, and MS cable types. The measurements indicated no major differences in the inductance values of the various samples.

BACTERIAL INFECTIONS IN THE HEART. AN EXPERIMENTAL STUDY ON THE INFLUENCE OF SILK AND SYNTHETIC SUTURES.

Introduction Although the exact incidence of bacterial endocarditis following cardiac surgery is unknown, the increasing frequency of individual cases reported in the literature indicates that this problem is common to all.1,3,6-9,11-13,15In other types of surgery a certain minimal incidence of infection might possibly be tolerated. Nevertheless, in cardiovascular surgery, because of the often severe and debilitating results and the possible fatal outcome of such a complication, the infection rate should be reduced to a minimum. Numerous reports have implicated the use of silk sutures in cardiac surgery as well as arterial surgery as a contributing cause for the increased incidence and persistence of infection.1,5,9Experimental evidence has shown the superiority of synthetic materials in comparison to silk in terms of local tissue reaction.2,4,5Most synthetic materials are monofilamentous whereas silk is the braided multifilamentous type. It is debatable whether sterilization of the monofilamentous material is better