3,212 research outputs found
Non-dispersive optics using storage of light
We demonstrate the non-dispersive deflection of an optical beam in a
Stern-Gerlach magnetic field. An optical pulse is initially stored as a
spin-wave coherence in thermal rubidium vapour. An inhomogeneous magnetic field
imprints a phase gradient onto the spin wave, which upon reacceleration of the
optical pulse leads to an angular deflection of the retrieved beam. We show
that the obtained beam deflection is non-dispersive, i.e. its magnitude is
independent of the incident optical frequency. Compared to a Stern-Gerlach
experiment carried out with propagating light under the conditions of
electromagnetically induced transparency, the estimated suppression of the
chromatic aberration reaches 10 orders of magnitude.Comment: 11 pages, 4 figures, accepted for publication in Physical Review
Alcoa Steamship Co. v. M/V Nordic Regent: Narrowing the Scope of Inquiry in Forum Non Conveniens
Increases in the amount and complexity of international trade and changes in jurisdictional rules over the last thirty years have often resulted in American courts serving as forums for suits involving non-residents. Very often these suits are the result of transactions that have occurred abroad and may be governed by foreign law as well. Obvious difficulties confront a party compelled to defend in a foreign court. Problems such as unfamiliarity with the language or legal process, unavailability of witnesses, or expenses incurred in bringing evidence from another country have led foreign defendants to seek dismissal of suits on the grounds of forum non conveniens
Shear Thickening and Scaling of the Elastic Modulus in a Fractal Colloidal System with Attractive Interactions
Dilute oil dispersions of fractal carbon black particles with attractive Van
der Waals interactions display continuous shear thickening followed by shear
thinning at high shear rates. The shear thickening transition occurs at
and is driven by hydrodynamic
breakup of clusters. Pre-shearing dispersions at shear rates
produces enhanced-modulus gels where and is directly proportional to the residual stress
in the gel measured at a fixed sample age. The observed data can be accounted
for using a simple scaling model for the breakup of fractal clusters under
shear stress.Comment: 5 pages, 5 figures; v2: treating low shear rate date separately;
edited title; reworked figure
Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene
Bilayer graphene has attracted considerable interest due to the important
role played by many-body effects, particularly at low energies. Here we report
local compressibility measurements of a suspended graphene bilayer. We find
that the energy gaps at filling factors v = 4 do not vanish at low fields, but
instead merge into an incompressible region near the charge neutrality point at
zero electric and magnetic field. These results indicate the existence of a
zero-field ordered state and are consistent with the formation of either an
anomalous quantum Hall state or a nematic phase with broken rotational
symmetry. At higher fields, we measure the intrinsic energy gaps of
broken-symmetry states at v = 0, 1 and 2, and find that they scale linearly
with magnetic field, yet another manifestation of the strong Coulomb
interactions in bilayer graphene.Comment: 9 pages, including 4 figures and supplementary material
Transconductance fluctuations as a probe for interaction induced quantum Hall states in graphene
Transport measurements normally provide a macroscopic, averaged view of the
sample, so that disorder prevents the observation of fragile interaction
induced states. Here, we demonstrate that transconductance fluctuations in a
graphene field effect transistor reflect charge localization phenomena on the
nanometer scale due to the formation of a dot network which forms near
incompressible quantum states. These fluctuations give access to fragile
broken-symmetry and fractional quantum Hall states even though these states
remain hidden in conventional magnetotransport quantities.Comment: 6 pages, 3 figure
Forming Maximally Diverse Workgroups: An Empirical Study
This work addresses two related important themes in business and business schools today: expanding diversity in the workplace and the increasing reliance on teams as an organizational structure. The paper describes an approach for creating student work groups where the objective is to maximize within group diversity based upon multiple criteria. This approach is an extension of a heuristic-based multiple-criteria decision support system (MCADSS) developed in earlier work (Weitz and Jelassi [1992]); that system was successfully implemented, and is currently in use, at the European Institute of Business Administration (INSEAD) in Fontainebleau, France. The heuristic has been modified here to incorporate a different set of criteria, and to allow for students placing out of core courses. This paper discusses the modified system, its implementation at the Stern School of Business at New York University (NYU), and an empirical experiment evaluating the performance of the system
SOLVING MULTI-CRITERIA ALLOCATION PROBLEMS: A DECISION SUPPORT SYSTEM APPROACH
MCADSS is a multi-criteria allocation decision support system for
assisting in the task of partitioning a set of individuals into groups.
Based upon multiple criteria, MCADSSâs goal is to maximize the diversity of
members within groups, while minimizing the average differences between
groups. (The project may be viewed from several perspectives: as a multi-criteria
decision making problem, as a "reverse" clustering problem, or as a
personnel assignment problem). The system is currently being used to
allocate MBA students into sections and study teams at INSEAD, a leading
European business school. This paper describes the rationale for MCADSS,
design criteria, system methodology, and application results. It also
suggests how the approach outlined here might be used for further
applications.Information Systems Working Papers Serie
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