16,458 research outputs found
Riders net moment estimation using control force of motion system for bicycle simulator
No full textOne of the challenging problems with bicycle simulators is to deal with the virtual bicycle dynamics that is coupled with rider's motion. For the virtual bicycle dynamics calculation and the real time simulation, it is necessary to identify the control inputs from the rider as well as the virtual environments. The steering, pedaling, and braking torques can be easily measured by using torque sensors and the virtual environments can be generated and provided by a visual system. However, direct measurement of the rider's net moment that significantly affects the bicycle motion is not practical. In this work, it is shown that six control forces of the Stewart platform-based motion system can be used for effective estimation of the rider's net moment, incorporated with the sliding mode controller with perturbation estimation. (C) 2004 Wiley Periodicals, Inc
Unusual Case of Scalp Sarcoidosis with Alopecia: An Only Manifestation of Cutaneous Sarcoidosis without Systemic Involvement
No full textQuasideterministic generation of entangled atoms in a cavity
No full text©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v89/e237901
DOI: 10.1103/PhysRevLett.89.237901
PACS: 03.65.Ud, 42.50.CtWe present a scheme to generate a maximally entangled state of two three-level atoms in a cavity. The success or failure of the generation of the desired entangled state can be determined by detecting the polarization of the photon leaking out of the cavity. With the use of an automatic feedback, the success probability of the scheme can be made to approach unity.This research was supported by the Brain Korea 21 Project of the Korean Ministry of Education, by the Korea Research Foundation under Contract No. DP0107, and by the Korea Science and Engineering Foundation under Contract No. 1999-2-121-005-3. We thank Professor D. H. Cho of Korea University for helpful discussions
Silylation of Iron-Bound Carbon Monoxide Affords a Terminal Fe Carbyne
Full text linkA series of monocarbonyl iron complexes in the formal oxidation states 0, +1, and +2 are accessible when supported by a tetradentate tris(phosphino)silyl ligand (SiPiPr 3 = [Si(o-C(6)H(4)PiPr(2))(3)](-)). X-ray diffraction (XRD) studies of these carbonyl complexes establish little geometrical change about the iron center as a function of oxidation state. It is possible to functionalize the terminal CO ligand of the most reduced carbonyl adduct by addition of SiMe3+ to afford a well-defined iron carbyne species, (SiP3iPr)Fe equivalent to C-OSiMe3. Single-crystal XRD data of this iron carbyne derivative reveal an unusually short Fe equivalent to C-OSiMe3 bond distance (1.671(2) angstrom) and a substantially elongated C-O distance (1.278(3) angstrom), consistent with Fe-C carbyne character. The overall trigonal bipyramidal geometry of (SiP3iPr)Fe equivalent to C-OSiMe3 compares well with that of the corresponding carbonyls, (SiP3iPr)Fe(CO)(-), (SiP3iPr)Fe(CO), and (SiP3iPr)Fe(CO)(+). Details regarding the electronic structure of the carbyne complex have been explored via the collection of comparative Mossbauer data for all of the complexes featured and also via DFT calculations. In sum, these data point to a strongly a-accepting Fischer-type carbyne ligand that confers stability to a low-valent iron(0) rather than high-valent iron(IV) center
In-field dependences of the critical current density Jc in GdBa2Cu3O7-d coated conductors produced by Zr irradiation and post-annealing at low temperatures
No full textWe report the influence of 6 MeV Zr4+irradiation and post-irradiation annealing (200 °C) in the in-field dependences of the critical current densities Jc of 1.3 thick GdBa2Cu3O7-d coated conductors grown by co-evaporation. Samples were irradiated with 6 MeV Zr4+ and fluences between 2.3 × 1011 cm−2 and 3 × 1012 cm−2. The correlation between the superconducting critical temperature Tc and in-field dependences of Jc has been analyzed. In addition, random disorder introduced by irradiation was reduced by thermal annealed at 200 °C. The analysis of our experimental findings indicates that the optimal irradiation (reducing random disorder by annealing) results in the suppression of the self-field Jc of ≈10% and in-field Jc enhancements nearly doubled at about 5 T. A clear correlation between Tc, disorder and self-field Jc is observed. Additional random disorder and nanoclusters suppress systematically Tc and increase the flux creep relaxation at intermediate temperatures (reducing the characteristic glassy μ value).Fil: Haberkorn, Nestor Fabian. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche | Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche; ArgentinaFil: Suarez, Sergio Gabriel. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; ArgentinaFil: Lee, Jae Hun. No especifíca;Fil: Moon, S.H.. No especifíca;Fil: Lee, Hunju. No especifíca
Degradation of pyridine by Nocardioides sp. strain OS4 isolated from the oxic zone of a spent shale column
No full textA pyridine-degrading bacterial strain was isolated from the oxic zone of a spent share column. The microorganism was an aerobic and pleomorphic coryneform bacterium with LL-diaminopimelic acid in the cell wall. On the basis of its phylogenetic and chemotaxonomic characteristics, the strain was identified as Nocardioides sp. strain OS4. The pyridine was completely degraded and the growth yield was 0.30 g cell/g pyridine. Strain OS4 metabolized pyridine in an inducible manner and released a pigment that has maximum absorbance at 400 nm during the pyridine degradation. This strain also degraded some compounds of the basic fraction of retort water and various other aromatic compounds
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