The present study of the cyclooctatetraene potential energy surface shows the presence of a bifurcation (valley ridge inflection point) in the intrinsic reaction coordinate path between the two transition states of D(8h) and D(4h) symmetries. This result is of capital importance for the correct understanding of the bond shifting and ring inversion processes in this compound.

We derive regions for T-cubic and arc/T-cubic spirals to two-point Hermite interpolation in terms of unit tangent vectors with help of Mathematica. The use of spirals gives the designer an excellent and speedy control over the shape of curve that is produced because there are no internal curvature maxima, curvature minima, inflection points, loops and cusps in a spiral segment.

We investigate the hydrogen bonding percolation threshold of water molecules at the surface of the liquid-vapor interface. We show that the percolation temperature agrees within statistical accuracy with the high-temperature inflection point of the water surface tension. We associate the origin of this surface tension anomaly of water with the sudden breakup of the hydrogen-bonding network in t...

After being mainly a research topic, semantic technologies (ST) have reached an inflection point in the market. This paper discusses the benefits (data integration and federation, agile schema development, semantic and collaborative / social computing search capabilities) and costs (namely technical, modeling, measuring and educational challenges) of Semantic Technologies with respect to their ...

Biologists have discovered a kind of weakly electric fish that identifies its prey by using active electrolocation in virtual darkness. In this study, we built an underwater system platform designed to investigate the biological mechanism allowing these distinguish objects and determine how amplitude information-frequency characteristic (AIFC) response are affected geometric characteristics tar...

21 Arecent conference in Las Vegas, sponsored by the Emergent Group, focused on the newly emerging field of ConsumerDirected Health Care (CDHC). In many ways it was a flashback from the mid-to-late 1980s, when managed behavioral healthcare was just emerging as a field. Many of the same things are happening now in CDHC as they were then for managed care — the field is being invented as it grows,...

At present, several techniques exist that claim to evaluate endothelium-dependent vasodilation (EDV) in the human peripheral circulation. The present study aims to evaluate the relationships between four of these techniques. A group of 24 young, healthy subjects underwent measurements of EDV and endothelium-independent vasodilation (EIDV) in predominately resistance vessels in the forearm using...