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Name
Caltech Authors
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50581 Publications
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  • Charles F. Richter: A personal tribute

    Allen, Clarence R. (1987)
    With the death of Charles Richter in 1985, the seismological community lost a renowned colleague, and many of us lost a close friend and advisor. Charles was born on a farm in Ohio in 1900, received his A.B. from Stanford in 1920, and his Ph.D. from Caltech in 1928. Virtually his entire professional career was spent at the Seismological Laboratory in Pasadena, first as an employee of the Carnegie Institution of Washington and later as a Caltech faculty member. Following h...

    Consistent large-eddy simulation of a temporal mixing layer laden with evaporating drops. Part 2. A posteriori modelling

    Leboissetier, Anthony; Okong'o, Nora; Bellan, Josette (2005)
    Large-eddy simulation (LES) is conducted of a three-dimensional temporal mixing layer whose lower stream is initially laden with liquid drops which may evaporate during the simulation. The gas-phase equations are written in an Eulerian frame for two perfect gas species (carrier gas and vapour emanating from the drops), while the liquid-phase equations are written in a Lagrangian frame. The effect of drop evaporation on the gas phase is considered through mass, species, momentum and energy sou...

    The Total Synthesis of (+)-Dragmacidin F

    Garg, Neil K.; Caspi, Daniel D.; Stoltz, Brian M. (2004)
    The first total synthesis of (+)-dragmacidin F has been accomplished, establishing the absolute configuration of this biologically important, antiviral marine alkaloid. The convergent route described features a palladium-mediated oxidative pyrrole carbocylization reaction to construct the [3.3.1] bicycle, as well as a highly selective Suzuki coupling to build the carbon skeleton of the natural product. A late-stage Neber rearrangement allows for the facile installation of the aminoimidazole m...

    On the Low Energy Decrease in Galactic Cosmic Ray Secondary/Primary Ratios

    Davis, A. J.; Mewaldt, R. A.; Binns, W. R.; Christian, E. R.; Cummings, A. C.; George, J. S.; Hink, P. L.; Leske, R. A.; von Rosenvinge, T. T.; Wiedenbeck, M. E.; Yanasak, N. E. (2000)
    Galactic cosmic ray (GCR) secondary/primary ratios such as B/C and (Sc+Ti+V)/Fe are commonly used to determine the mean amount of interstellar material through which cosmic rays travel before escaping from the Galaxy (Λ_(esc)). These ratios are observed to be energy-dependent, with a relative maximum at ~1 GeV/nucleon, implying a corresponding peak in Λ_(esc). The decrease in Λ_(esc) at energies above 1 GeV/nucleon is commonly taken to indicate that higher energy cosmic rays escape more easil...

    Earth Structure from Free Oscillations and Travel Times

    Jordan, Thomas H.; Anderson, Don L. (1974)
    An extensive set of reliable gross Earth data has been inverted to obtain a new estimate of the radial variations of seismic velocities and density in the Earth. The basic data set includes the observed mass and moment of inertia, the average periods of free oscillation (taken mainly from the Dziewonski-Gilbert study), and five new sets of differential travel-time data. The differential travel-time data consists of the times of PcP-P and ScS-S, which contain information about mantle structure...
  • Dance with a robot

    Trautman, Peter (2012)
    N.b.:In the wide upper panel, the position and trajectory marker (red lines and dots) are accurate according to the underlying grid. However, the projection of the video is offset slightly (due to camera curvature) from the tracks. This is an error in presentation; tracking error was almost uniformly within 1 foot of truth. Sometimes, our navigation algorithm resulted in quite humorous situations: at the beginning of one run, while the navigation algorithm was still starting up, a patro...

    Markets in Action: Illumination Through New Experimental Methods

    Plott, Charles R. (1979)
    Publisher: Polynomics Research Laboratory
    n/a

    Dense crowds and a careful ending

    Trautman, Peter (2012)
    The continual motion behavior of the robot can be quite useful in dense crowds. For instance, the reactive robot did not display this behavior---when a collision was imminent, it stopped completely. Unfortunately, a completely stopped robot is very hard for a human to understand. Is this robot turned off? Is this robot waiting for me? Meanwhile, the multiple goal interacting Gaussian process robot displayed intentionality. Animators call this behavior "readability'', and it can be emplo...

    Conversationalist Robot in student cafeteria

    Trautman, Peter (2012)
    N.b.:In the wide upper panel, the position and trajectory marker (red lines and dots) are accurate according to the underlying grid. However, the projection of the video is offset slightly (due to camera curvature) from the tracks. This is an error in presentation; tracking error was almost uniformly within 1 foot of truth. A highly useful behavior of the robot was that it was always in motion. This was achieved safely by doing the following: if a collision was imminent, the forward vel...
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