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  • Ali Hortaçsu, Chad Syverson, Judy Chevalier, Lars Hansen, Tom Hubbard, Boyan Jovanovic +7 others
  • 2003
* Zvi Eckstein and Alan Sorenson provided thoughtful suggestions regarding earlier drafts. We have also benefited from discussions with Abstract Two salient features of the competitive structure of the U.S. mutual fund industry are the large number of funds and the sizeable dispersion in the fees funds charge investors, even within narrow asset classes.(More)
Two-photon fluorescence microscopy (2PM)(1) enables scientists in various fields including neuroscience(2,3), embryology(4), and oncology(5) to visualize in vivo and ex vivo tissue morphology and physiology at a cellular level deep within scattering tissue. However, tissue scattering limits the maximum imaging depth of 2PM within the mouse brain to the(More)
We compare the maximal two-photon fluorescence microscopy (TPM) imaging depth achieved with 775-nm excitation to that achieved with 1280-nm excitation through in vivo and ex vivo TPM of fluorescently-labeled blood vessels in mouse brain. We achieved high contrast imaging of blood vessels at approximately twice the depth with 1280-nm excitation as with(More)
Neuroscience is at a crossroads. Great effort is being invested into deciphering specific neural interactions and circuits. At the same time, there exist few general theories or principles that explain brain function. We attribute this disparity, in part, to limitations in current methodologies. Traditional neurophysiological approaches record the(More)
OBJECTIVES Magnetoencephalography (MEG) signals are, on theoretical grounds, thought to be relatively undistorted by the skull in contrast to electroencephalographic (EEG) signals. This assumption was experimentally tested in an animal preparation with a brain similar to the human brain in many respects. METHODS Possible skull effects on MEG were(More)
We design and implement a novel class of highly precise network instrumentation and apply this tool to perform the first exact packet-timing measurements of a wide-area network ever undertaken, capturing 10 Gigabit Ethernet packets in flight on optical fiber. Through principled design, we improve timing precision by two to six orders of magnitude over(More)
We demonstrate a scalable, energy-efficient, and pragmatic method for high-bandwidth wavelength multicasting using FWM in silicon photonic nanowires. We experimentally validate up to a sixteen-way multicast of 40-Gb/s NRZ data using spectral and temporal responses, and evaluate the resulting data integrity degradation using BER measurements and power(More)
We assessed whether subcortical structures can generate magnetic fields detectable outside the brain by first measuring the somatic evoked magnetic fields (SEFs) from a decorticated porcine preparation and then from an intact preparation. Strong SEFs were detected a few millimeters above the corpus callosum after electrical stimulations of the snout. The(More)
In this article we bring together opposing international relations theories to better understand U+S+ foreign policy, in particular foreign trade and aid+ Using votes in the U+S+ House of Representatives from 1979–2004, we explore different theoretical predictions about preferences for foreign economic policy+ We assess the impact of domestic factors,(More)
Luminescent markers play a key role in imaging techniques for life science since they provide a contrast mechanism between signal and background. We describe a new type of marker using second harmonic generation (SHG) from noncentrosymmetric BaTiO 3 nanocrystals. These nanoparticles are attractive due to their stable, non-saturating and coherent signal with(More)