3,566 research outputs found
Discharge coefficients for thick-plate orifices
Investigation enables more accurate prediction of coolant flows within internally cooled turbine blades and vanes. The data is applicable for predicting flows in complex flow passages
Evaluation of Skylab EREP data for land resource management
There are no author-identified significant results in this report
Holomorphic Parafermions in the Potts model and SLE
We analyse parafermionic operators in the Q-state Potts model from three
different perspectives. First, we explicitly construct lattice holomorphic
observables in the Fortuin-Kasteleyn representation, and point out some special
simplifying features of the particular case Q=2 (Ising model). In particular,
away from criticality, we find a lattice generalisation of the massive Majorana
fermion equation. We also compare the parafermionic scaling dimensions with
known results from CFT and Coulomb gas methods in the continuum. Finally, we
show that expectation values of these parafermions correspond to local
observables of the SLE process which is conjectured to describe the scaling
limit of the Q-state Potts model.Comment: 18 pages. v2: references to related work clarified. v3: minor
corrections, version accepted for publication in JSTA
Gender Equity in College Athletics: Women Coaches as a Case Study
As Title IX celebrates its 35th anniversary, many have noted the positive impact it has had on women sports. But there is also an unintended (and oft-neglected) byproduct: as opportunities for female students have increased, opportunities for female professionals have declined. This Article focuses on the barriers that still confront women in college athletics, particularly those who seek professional positions in coaching and administration. Part I presents a brief overview of Title IX, which makes clear its limitations in securing gender equity. Part II.A discusses the declining representation and lower success rate of women coaches, while Part II.B explores the areas of Title IX (and accompanying federal statutory provisions) that have sought to secure their equal treatment. Part III presents the findings of the empirical research conducted for this Article. We surveyed over 450 coaches of women collegiate teams to better understand their needs, priorities, and opinions on coaching and the role of Title IX. Part IV situates these findings in light of other research on barriers for women in male-dominated settings, including coaching, and concludes with potential policy prescriptions
Twist operator correlation functions in O(n) loop models
Using conformal field theoretic methods we calculate correlation functions of
geometric observables in the loop representation of the O(n) model at the
critical point. We focus on correlation functions containing twist operators,
combining these with anchored loops, boundaries with SLE processes and with
double SLE processes.
We focus further upon n=0, representing self-avoiding loops, which
corresponds to a logarithmic conformal field theory (LCFT) with c=0. In this
limit the twist operator plays the role of a zero weight indicator operator,
which we verify by comparison with known examples. Using the additional
conditions imposed by the twist operator null-states, we derive a new explicit
result for the probabilities that an SLE_{8/3} wind in various ways about two
points in the upper half plane, e.g. that the SLE passes to the left of both
points.
The collection of c=0 logarithmic CFT operators that we use deriving the
winding probabilities is novel, highlighting a potential incompatibility caused
by the presence of two distinct logarithmic partners to the stress tensor
within the theory. We provide evidence that both partners do appear in the
theory, one in the bulk and one on the boundary and that the incompatibility is
resolved by restrictive bulk-boundary fusion rules.Comment: 18 pages, 8 figure
Rotation in the Orion Nebula Cluster
Eighteen fields in the Orion Nebula Cluster (ONC) have been monitored for one
or more observing seasons from 1990-99 with a 0.6-m telescope at Wesleyan
University. Photometric data were obtained in Cousins I on 25-40 nights per
season. Results from the first 3 years of monitoring were analyzed by Choi &
Herbst (1996; CH). Here we provide an update based on 6 more years of
observation and the extensive optical and IR study of the ONC by Hillenbrand
(1997) and Hillenbrand et al. (1998). Rotation periods are now available for
134 ONC members. Of these, 67 were detected at multiple epochs with identical
periods by us and 15 more were confirmed by Stassun et al. (1999) in their
study of Ori OBIc/d. The bimodal period distribution for the ONC is confirmed,
but we also find a clear dependence of rotation period on mass. This can be
understood as an effect of deuterium burning, which temporarily slows the
contraction and thus spin-up of stars with M <0.25 solar masses and ages of ~1
My. Stars with M <0.25 solar masses have not had time to bridge the gap in the
period distribution at ~4 days. Excess H-K and I-K emission, as well as CaII
infrared triplet equivalent widths (Hillenbrand et al. 1998), show weak but
significant correlations with rotation period among stars with M >0.25 solar
masses. Our results provide new observational support for the importance of
disks in the early rotational evolution of low mass stars. [abridged]Comment: 18 pages of text, 17 figures, and 4 tables; accepted for publication
in The Astronomical Journa
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