919 research outputs found
Influence of Course Design on Learning Approaches and Academic Performance in Physical Therapy Students
AbstractThis study investigated (1) changes in learning approaches and academic performance between courses designed according to lecture-based learning or problem-based learning, (2) the relationship between academic performance and learning approaches. 32 students participated in this study. Students’ learning approaches were ascertained by the Approaches and Study Skills Inventory for Students. Summative results from each course indicated academic performance. The results showed that approximately 50% of students changed their learning approaches for different course designs. Furthermore, choice of learning approach influenced academic performance in a course designed according to problem-based learning but not in one designed according to lecture-based learning
A Regulatory Framework for Exchange-Traded Funds
This is the first academic work to show the need for, or to offer, a regulatory framework for exchange-traded funds ( ETFs ). The economic significance of this financial innovation is enormous. U.S.-listed ETFs now hold more than $3.6 trillion in assets and comprise seven of the country’s ten most actively traded securities. ETFs also possess an array of unique characteristics raising distinctive concerns. They offer what we here conceptualize as a nearly frictionless portal to a bewildering, continually expanding universe of plain vanilla and arcane asset classes, passive and active investment strategies, and long, short, and leveraged exposures. And we argue that ETFs are defined by a novel, model-driven device that we refer to as the arbitrage mechanism, a device that has sometimes failed catastrophically. These new products and the underlying innovation process create special risks for investors and the financial system
A blowup criterion for ideal viscoelastic flow
We establish an analog of the Beale-Kato-Majda criterion for singularities of
smooth solutions of the system of PDE arising in the Oldroyd model for ideal
viscoelastic flow
Distributed Approximation of Minimum Routing Cost Trees
We study the NP-hard problem of approximating a Minimum Routing Cost Spanning
Tree in the message passing model with limited bandwidth (CONGEST model). In
this problem one tries to find a spanning tree of a graph over nodes
that minimizes the sum of distances between all pairs of nodes. In the
considered model every node can transmit a different (but short) message to
each of its neighbors in each synchronous round. We provide a randomized
-approximation with runtime for
unweighted graphs. Here, is the diameter of . This improves over both,
the (expected) approximation factor and the runtime
of the best previously known algorithm.
Due to stating our results in a very general way, we also derive an (optimal)
runtime of when considering -approximations as done by the
best previously known algorithm. In addition we derive a deterministic
-approximation
Establishment of an arabinose-inducible system in Stenotrophomonas maltophilia
A pBBad22T-derived conditioned arabinose (Ara)-inducible expression system was evaluated in Stenotrophomonas maltophilia (an opportunistic pathogen and has gained increasing attention as a cause of healthcare-associated infection). S. maltophilia cannot grow well when Ara is the sole available carbon source. The induction kinetic study, optimal inducer concentration determination, and depletion experiment were performed by using a xylE gene fusion construct, pBxylE, to monitor the expression of pBBad22T in S. maltophilia. For induction survey, the expression of catechol 2,3-dioxygenase (C23O), encoded by xylE gene, continuously increases during an 8-h induced course and can be modulated by different inducer concentrations. The applied induction condition of pBBad22T in S. maltophilia is the inducer concentration ranging from 0.1% to 0.5% for an induction time of 4 h. For repression evaluation, the C23O expression is rapidly turned off within 30 min after the removal of Ara. Accordingly, the established Ara-inducible system can provide a convenient tool for the study of S. maltophilia
Analytic approximation and an improved method for computing the stress-energy of quantized scalar fields in Robertson-Walker spacetimes
An improved method is given for the computation of the stress-energy tensor
of a quantized scalar field using adiabatic regularization. The method works
for fields with arbitrary mass and curvature coupling in Robertson-Walker
spacetimes and is particularly useful for spacetimes with compact spatial
sections. For massless fields it yields an analytic approximation for the
stress-energy tensor that is similar in nature to those obtained previously for
massless fields in static spacetimes.Comment: RevTeX, 8 pages, no figure
Singularites at a Dense Set of Temperature in Husimi Tree
We investigate complex temperature singularities of the three-site
interacting Ising model on the Husimi tree in the presentce of magnetic field.
We show that at certain magnetic field these singularities lie at a dense set
and as a consequence the phase transition condensation take place.Comment: ps file, 10 page
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