The paper deals with the analysis of flux-controlled memristor which is described by its unambiguous charge-flux constitutive relation. The memristor is excited by ideal sinusoidal voltage source in order to sense its typical i – v pinched hysteretic loop. Two equivalent schematics of the transformation of the exciting voltage into the current response are described. The first one is selected f...

We demonstrate a pinched flow tangential filtration method to sort spermatozoa from larger particles with a spermatozoa collection efficiency of 94±2% and a separation efficiency of 100%. In conventional pinched flow fractionation (PFF), an observed tumbling-like rotation of spermatozoa complicates their separation from other particles. The new design circumvents this effect.

We prove that all smooth sphere bundles that admit fiberwise 1/4-pinched metrics are induced bundles of vector bundles, so their structure groups reduce from DIFF(Sn) to O(n + 1). This result implies the existence of many smooth Sn-bundles over Sk that do not support strictly 1/4-pinched positively curved Riemannian metrics on their fibers.

In the title compound, C(30)H(26)Br(2)O(4)S(4), the thia-calix[4]arene unit adopts a pinched cone conformation, with one of the ether-substituted rings bent towards the calix cavity and the two phenolic rings bent outwards. The phenyl rings make dihedral angles of 27.12 (9), 36.71 (10), 75.04 (8), and 76.01 (7)° with the virtual plane defined by the four bridging S atoms. The two opposite ether...

A simple emulator of memristive system, containing only passive electronic components, namely resistors, capacitor, and no-DC biased transistor is described. Unlike other hitherto published emulators it does not exploit DC power supply. Moreover, it provides effective emulation of grounded as well as floating memristive systems. The circuit idea enables interesting experiments, demonstrating th...

Abstract We make rigorous and old idea of using mean curvature flow to prove a theorem Richard Hamilton on the compactness proper hypersurfaces with pinched, bounded curvature.

The fast contraction, or pinching, of optical vortices in both thermal and Kerr self-defocusing media is investigated by numerical techniques. For the thermal case, heat diffusion across the vortex core is described, and the heretofore unexplained stability of optical-vortex solitons in thermal media is explained. © 2001 Optical Society of America OCIS codes: 190.4420, 190.5940, 190.3270, 160.4...