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  • 1
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    Coseismic fluid-pressure response estimated from prediction-error filtering of tidal-band loading (1999)
    In:  Bull. Seism. Soc. Am., Bonn, Inst. f. Theoret. Geodäsie, vol. 89, no. 6, pp. 1439-1446, pp. L04601, (ISSN: 1340-4202)
    Details
    Publication Date: 1999
    Keywords: Seismology ; Fluids ; Earth tides ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Common dynamic structure of canada lynx populations within three climatic regions (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-08-14
    Description: Across the boreal forest of Canada, lynx populations undergo regular density cycles. Analysis of 21 time series from 1821 onward demonstrated structural similarity in these cycles within large regions of Canada. The observed population dynamics are consistent with a regional structure caused by climatic features, resulting in a grouping of lynx population dynamics into three types (corresponding to three climatic-based geographic regions): Pacific-maritime, Continental, and Atlantic-maritime. A possible link with the North Atlantic Oscillation is suggested.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stenseth -- Chan -- Tong -- Boonstra -- Boutin -- Krebs -- Post -- O'Donoghue -- Yoccoz -- Forchhammer -- Hurrell -- New York, N.Y. -- Science. 1999 Aug 13;285(5430):1071-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Advanced Study, The Norwegian Academy of Science and Letters, Drammensveien 78, N-0271 Oslo, Norway. Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway. Department of Statistics.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10446054" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Rho1p, a yeast protein at the interface between cell polarization and morphogenesis (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-04-12
    Description: The enzyme that catalyzes the synthesis of the major structural component of the yeast cell wall, beta(1--〉3)-D-glucan synthase (also known as 1,3-beta-glucan synthase), requires a guanosine triphosphate (GTP) binding protein for activity. The GTP binding protein was identified as Rho1p. The rho1 mutants were defective in GTP stimulation of glucan synthase, and the defect was corrected by addition of purified or recombinant Rho1p. A protein missing in purified preparations from a rho1 strain was identified as Rho1p. Rho1p also regulates protein kinase C, which controls a mitogen-activated protein kinase cascade. Experiments with a dominant positive PKC1 gene showed that the two effects of Rho1p are independent of each other. The colocalization of Rho1p with actin patches at the site of bud emergence and the role of Rho1p in cell wall synthesis emphasize the importance of Rho1p in polarized growth and morphogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Drgonova, J -- Drgon, T -- Tanaka, K -- Kollar, R -- Chen, G C -- Ford, R A -- Chan, C S -- Takai, Y -- Cabib, E -- New York, N.Y. -- Science. 1996 Apr 12;272(5259):277-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory od Biochemistry and Metabolism, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8602514" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Polarity ; Cell Wall/metabolism ; GTP Phosphohydrolases/*metabolism ; GTP-Binding Proteins/genetics/*metabolism ; Glucans/biosynthesis ; Glucosyltransferases/*metabolism ; Guanosine 5'-O-(3-Thiotriphosphate)/pharmacology ; Guanosine Triphosphate/metabolism ; *Membrane Proteins ; Morphogenesis ; Mutation ; Protein Kinase C/metabolism ; Recombinant Proteins/pharmacology ; Saccharomyces cerevisiae/cytology/genetics/growth & development/*metabolism ; Saccharomyces cerevisiae Proteins ; *Schizosaccharomyces pombe Proteins ; Temperature ; *beta-Glucans ; *rho GTP-Binding Proteins
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Structure of high resistivity GaAs film grown by low-temperature metalorganic chemical vapor deposition (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3239-3241 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of a low-temperature GaAs layer grown by low-pressure metalorganic chemical vapor deposition with precursors of triethylgallium and arsine is reported. Dense particles containing Ga clusters are found in a high resistivity GaAs film grown at 420 °C. The size and concentration of particles are about 800–1000 nm and 7×1011 cm−3, respectively. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118022
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of Ethylene-Ozone and Cyclohexene-Ozone Charge-Transfer Complexes in Cryogenic Matrixes (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 562-563 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00106a077
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Gas dynamics and electromagnetic processes in high-current arc plasmas. Part II. Effects of external magnetic fields and gassing materials (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2547-2555 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Arc plasmas in switching devices are investigated in the presence of external and self-induced magnetic fields, as well as of gassing materials, using a three-dimensional computational model. The model development and validation for two- and three-dimensional arc columns with a self-induced magnetic field and natural-convection effects was presented in L. Z. Schlitz et al. [J. Appl. Phys. 85, 2540 (1999)]. The present paper discusses further development of the model to enable an investigation of the effects of external magnetic fields and the presence of gassing materials. Steady-state solutions with an external transverse magnetic field (0–20 mT) imposed on a wall-stabilized air arc column are presented, followed by a study of the transient response of the arc in an open-ended arc chamber in a 0.68 ms time span. Ablation from the side walls of the arc chamber made of gassing materials (and the resulting mixing of hydrogen and air) is shown to increase the arc voltage dramatically due to the increase in heat transfer around the arc body. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369573
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  • 7
    Electronic Resource
    Electronic Resource
    Gas dynamics and electromagnetic processes in high-current arc plasmas. Part I. Model formulation and steady-state solutions (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 2540-2546 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A three-dimensional computational model has been developed to study the effects of self-induced and external magnetic fields, as well as gassing effects, on arcs involved in switching devices. A commercial computational fluid dynamics code has been adapted and modified to model the fully coupled plasma flow, heat transfer, and electromagnetic field. In this paper, a model is developed to analyze a steady-state, two-dimensional axisymmetric air arc column at low current levels under conditions in which the effects of the self-induced magnetic field are negligible. The model is then extended to analyze a three-dimensional arc column at high current levels with the inclusion of self-induced magnetic effects. The effects of cathode size, distance from the electrode, current level, self-induced magnetic field, and natural convection on the arc plasma are investigated. Predictions from these models compare favorably with published analytical and experimental results. The influence of external transverse magnetic fields, as well as the presence of gassing materials, on a three-dimensional arc column in both steady-state and transient situations will be discussed in L. Z. Schlitz et al. [J. Appl. Phys. 85, 2547 (1999)]. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369572
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  • 8
    Electronic Resource
    Electronic Resource
    Velocity Estimation for Robot Manipulators Using Neural Network (1998)
    Springer
    Journal of intelligent and robotic systems 23 (1998), S. 147-163 
    Details
    ISSN: 1573-0409
    Keywords: incremental encoder ; velocity estimator ; neural network ; training scheme ; robotic assembly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In robot manipulators, optical incremental encoders are widely used as the transducers to monitor joint position and velocity information. With incremental encoder, positional information is determined as discrete data relative to a reference (home) position. However, velocity information can only be deduced by processing the position data. In this paper, a method of using a neural network to estimate the velocity information of robotic joint from discrete position versus time data is proposed and evaluated. The architecture of the neural net and the training methodology are presented and discussed. This approach is then applied to estimate the joint velocity of a SCARA robot while performing an electronic component assembly task. Based on computer simulations, comparison of the accuracy of the neural network estimator with two other well established velocity estimation algorithms are made. The neural net approach can maintain good performance even in the presence of measurement noises.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008022430399
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  • 9
    Electronic Resource
    Electronic Resource
    Variable Structure Control of Robot Manipulators with Perturbation Estimator (1999)
    Springer
    Journal of intelligent and robotic systems 26 (1999), S. 29-46 
    Details
    ISSN: 1573-0409
    Keywords: robot manipulators ; variable structure control ; sliding mode ; perturbation compensation ; system uncertainties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The idea of perturbation compensation is incorporated in variable structure control (VSC) of robot manipulators to cancel the effects of system parametric uncertainties and external disturbances and hence alleviate control chattering. By using the dynamic response of the robot as characterized by the sliding function, a technique is proposed to deduce the system perturbation signal. For practical implementation, a perturbation estimator is introduced to approximate the system uncertainties. Estimates of the bounds on modelling errors and external disturbances are not required while signal measurement uncertainties can be accommodated. The suggested VSC law ensures that the robot control system reaches the sliding mode in finite time and with prescribed transient behaviour. Detailed computer simulation results are presented to demonstrate the effectiveness of this new approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008017506382
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  • 10
    Electronic Resource
    Electronic Resource
    A real-time planning algorithm for obstacle avoidance of redundant robots (1996)
    Springer
    Journal of intelligent and robotic systems 16 (1996), S. 229-243 
    Details
    ISSN: 1573-0409
    Keywords: Redundant robots ; obstacle avoidance ; neural networks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A computationally efficient, obstacle avoidance algorithm for redundant robots is presented in this paper. This algorithm incorporates the neural networks and pseudodistance function D p in the framework of resolved motion rate control. Thus, it is well suited for real-time implementation. Robot arm kinematic control is carried out by the Hopfield network. The connection weights of the network can be determined from the current value of Jacobian matrix at each sampling time, and joint velocity commands can be generated from the outputs of the network. The obstacle avoidance task is achieved by formulating the performance criterion as D p〉d min (d min represents the minimal distance between the redundant robot and obstacles). Its calculation is only related to some vertices which are used to model the robot and obstacles, and the computational times are nearly linear in the total number of vertices. Several simulation cases for a four-link planar manipulator are given to prove that the proposed collision-free trajectory planning scheme is efficient and practical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00245422
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