In this research the mechanical behavior of composite suspension insulators with crimped end-fittings manufactured by NGK has been evaluated. Two issues have been addressed in this study. Insulators crimped with the standard, high, reversed and constant high stress conditions have been analyzed for their crimping deformations, and the two and three dimensional compression profiles for the four ...

Human colonization of the New World is generally believed to have entailed migrations from Siberia across the Bering isthmus. However, the limited archaeological record of these migrations means that details of the timing, cause and rate remain cryptic. Here, we have used a combination of ancient DNA, 14C dating, hydrogen and oxygen isotopes, and collagen sequencing to explore the colonization ...

Development of membranes technologies led industrials and researchers to focus on the way to optimize filtration processes in terms of quality and costs of production. In this way, this paper presents a study about determination of low fouling operating conditions in dead-end ultrafiltration of natural organic matter which leads to the definition of sustainable conditions for filtration by limi...

Incubation of the isolated acrosomal bundles of Limulus sperm with skeletal muscle actin results in assembly of actin onto both ends of the bundles. Because of the taper of these cross-linked bundles of actin filaments, one can distinguish directly the preferred end for assembly from the nonpreferred end. Loss of growth with time from the nonpreferred end was directly assessed by electron micro...

The end-Permian mass extinction, ∼252 million years ago, is notable for a complex recovery period of ∼5 Myr. Widespread euxinic (anoxic and sulfidic) oceanic conditions have been proposed as both extinction mechanism and explanation for the protracted recovery period, yet the vertical distribution of anoxia in the water column and its temporal dynamics through this time period are poorly constr...

Post-processing methods can be used in mobile communications to improve the intelligibility of speech in adverse near-end background noise conditions. Generally, it is assumed that the input of the post-processing contains quantization noise only, that is to say, no far-end noise is present. However, this assumption is not entirely realistic. Therefore, the effect of farend noise with and witho...

This paper investigates vortex shedding processes occurring at the end of a stack of parallel plates, due to an oscillating flow induced by an acoustic standing wave within an acoustic resonator. Here, Particle Image Velocimetry (PIV) is used to quantify the vortex shedding processes within an acoustic cycle phase-by-phase, in particular during the “ejection” of the fluid out of the stack. Stan...

BACKGROUND Parents who care for young children with chronic conditions are knowledge users. Their efforts, time, and energy to source, consider and monitor information add to the 'invisible' work of parents in making decisions about care, school transitions, and interventions. Little is known or understood about the work of parents as knowledge users. OBJECTIVE To understand the knowledge use...

Explicit solutions of the equations of Kirchhoff’s theory of elastic rods are employed to derive properties of the tertiary structure of a looped segment of DNA that is subject to geometric constraints imposed at its end points by bound proteins. In appropriate circumstances small changes in such boundary data cause a nearly planar loop to undergo a continuous and reversible transition that can...

On October 14, 2008, practices and policies in every dialysis unit in the United States and its territories will be significantly changed with the implementation of the 2008 Conditions for Coverage (CfCs) for End-Stage Renal Disease Facilities (Office of the Federal Register, 2008). These CfCs mark the first wholesale change in the regulations for dialysis units in more than 30 years, and the C...