We have studied the breaking of a two-dimensional alkane crystal above the disordered melt using an oscillating bubble rheometer. Surface tension changes abruptly during the expansion and contraction cycle. We postulate that this is due to rupture of the 2D crystal at grain boundaries. The magnitude of the abrupt change in surface tension decreases with a decrease in the rate of change of bubbl...

We further clarify how scalar metric perturbations are ampliied in an innationary cosmology. We rst construct a simple, analytic model of an in-ationary cosmology in which the expansion scale factor evolves continuously from an innationary era to a radiation-dominated era. From this model, it is clear to see how scalar perturbations are ampliied. Second, we examine the recent claims of Grishchu...

High pressure and low temperature experiments with CO(2) hydrate were performed using diamond anvil cells and a helium-refrigeration cryostat in the pressure and temperature range of 0.2-3.0 GPa and 280-80 K, respectively. In situ x-ray diffractometry revealed that the phase boundary between CO(2) hydrate and water+CO(2) extended below the 280 K reported previously, toward a higher pressure and...

We report a contraction-expansion array (CEA) microchannel for rapidly and homogeneously mixing different types of fluids by multivortex induced in alternately formed rectangular structures of the channel. Rapid mixing can be achieved in a topologically simple and easily fabricated CEA microchannel, employing a synergetic combination of two kinds of vortices: (1) expansion-vortices being induce...

A case of acute extrapyramidal manifestations consisting of dystonia and akathisia following abrupt discontinuation of propranolol is reported. She responded well to oral propranolol and intramuscular diazepam. Extrapyramidal symptoms have commonly been associated with acute or chronic administration of neuroleptic drugs. There have been reports of a substantial number of cases with simila...

Thunderclap headache, a severe headache which is maximal in intensity at onset, is associated with numerous underlying disorders, including subarachnoid hemorrhage, unruptured intracranial aneurysm, cervical artery dissection, cerebral venous sinus thrombosis, stroke, intracranial hemorrhage, reversible cerebral vasoconstriction syndrome, and reversible posterior leukoencephalopathy. After excl...