Exchange Interactions in Cobalt(II) and Nickel(II) Complexes Containing M-4(mu(3)-OH)(2) Metal Cores with Distorted Rhombic Topology
THEORETICAL AND EXPERIMENTAL CHEMISTRY
Authors: Goldberg, A. E.; Aleksandrov, G. G.; Bogomyakov, A. S.; Kiskin, M. A.; Kolotilov, S. V.; Utepova, I. A.; Sidorov, A. A.; Chupakhin, O. N.; Eremenko, I. L.
Abstract
Antiferromagnetic interactions between the Co2+ or Ni2+ ions were found in complexes [(mu(3) aEuroaEuro parts per thousand L)(2)Co (5) (II) (mu aEuroaEuro parts per thousand OH)(2)(Piv)(7)(NO3)] and [(mu(3) aEuroaEuro parts per thousand L)(2)(HPiv)Ni (4) (II) (mu(3) aEuroaEuro parts per thousand OH)(2)(Piv)(4)(NO3)(2)] (Piv(-) = pivalic acid anion, L = 1,1'-dipyridazinylferrocene) possessing a metal core with distorted rhombic topology M-4(mu(3)-OH)(2). In contrast to the case of symmetrical analogs, the signs of all the exchange interaction parameters J were determined unambiguously.
An advanced off-axis holographic particle image velocimetry (HPIV) system
EXPERIMENTS IN FLUIDS
Authors: Pu, Y; Meng, H
Abstract
Holographic PIV (HPIV) is the most promising candidate for the next generation full-field velocimetry that can measure high spatial resolution instantaneous three-dimensional (3D) velocity fields. To explore the maximum performance capabilities of HPIV including spatial resolution, off-axis holography based HPIV has become a major direction of development. A fully automated off-axis HPIV system based on an injection-seeded dual-pulsed YAG laser and 3D data processing software has been implemented in the laser flow diagnostics lab (LFD). In our system, 90-degree particle scattering, dual reference beams, in situ reconstruction/data processing, and 3D velocity extraction based on a fast "concise cross correlation" (CCC) algorithm are utilized. The off-axis HPIV system is tested for an acoustically excited air jet and the wake of a surface-mounted tab in a water channel flow giving instantaneous 3D velocity fields for both flows. Experimental data of instantaneously measured 3D flow structures using this technique show great promise.