An active noise control system has previously been developed for the reduction of tonal noise radiated by small axial cooling fans, such as those found in desktop computers. This system uses four small actuators surrounding the fan in a mock computer casing. Due to industry volume constraints, a smaller fan and speaker configuration is desirable. If the smaller configuration is able to maintain...

The stereochemistry of the ketosidic bond of sialic acid has been elucidated by a study of the two anomeric methyl ketosides. Isomer I was prepared by Koenig.+Knorr synthesis, and isomer II by direct methylation with methanol and an acid catalyst. These two anomeric configurations were established by conversion with periodate-borohydride to III and IV, respectively, followed by lactonization of...

Compact aero-engines that use centrifugal compressors are in high demand due to their small size and cost-effectiveness. However, limited improvements the aerodynamic performance of impellers have led a greater focus on improving diffusers. This paper introduces novel vane conformal diffuser designed match an impeller with pressure ratio. The utilizes unique design method creates transitions fr...

In the crystal structure of the title compound, [Pb(2)(C(4)H(5)NO(4))(2)(C(6)H(6)N(4)S(2))(2)]·4H(2)O, the dinuclear Pb(II) complex mol-ecule is centrosymmetric. The Pb atom is chelated by a tridentate imino-diacetate anion (IDA) and a diamino-bithia-zole (DABT) ligand, while a carboxyl-ate O atom from an adjacent IDA anion further bridges the Pb atom with a longer Pb-O bond [2.892 (3) Å]. The ...

The presumed ground state of a nematic fluid confined in a cylindrical geometry with planar anchoring corresponds to that of an axial configuration, wherein the director, free of deformations, is along the long axis of the cylinder. However, upon confinement of lyotropic chromonic liquid crystals in cylindrical geometries, here we uncover a surprising ground state corresponding to a doubly twis...

We investigate the effect of a pinned superfluid component on gravitational wave emission rotating neutron star. Pinning vortices to flux-tubes in outer core (where protons are likely form type-II superconductor) is possible mechanism sustain long-lived and non-axisymmetric currents interior, that break axial symmetry unperturbed hydrostatic configuration. consider pinning-induced perturbations...

The present paper presents an analytical study of the one-dimensional weak shock wave problem in a perfect gas under action generalized magnetic field subjected to jump conditions (R-H conditions). is considered axial and azimuthal cylindrically symmetric configuration. By considering straightforward approach, explicit solution exhibiting time-space dependency for gas-dynamical flow parameters ...