3,478 research outputs found
The unquenched Upsilon spectrum
We describe the bottomonium spectrum obtained on the UKQCD dynamical
ensembles and its comparison to quenched results. We include a determination of
alpha_s and m_b from the dynmaical results.Comment: Lattice 2000 (Heavy Quark Physics
Mixed Infection of Hard Red Winter Wheat with High Plains Virus and Wheat Streak Mosaic Virus from Wheat Curl Mites in Nebraska
A new disease of wheat and corn caused by the High Plains virus (HPV) has been observed in the High Plains region of western United States. HPV is transmitted by the wheat curl mite, Aceria tosichella, which is also the vector of wheat streak mosaic virus (WSMV). In the field it is extremely difficult to visually differentiate plants infected with WSMV from those with HPV. An indirect protein-A sandwich enzyme-linked immunosorbent assay (PAS-ELISA) and Western blot analysis were used to identify WSMV and HPV. Samples of wheat curl mites were collected from arbitrarily chosen sites from commercial wheat plantings in 1995 and 1996 and used to infest caged wheat plants. After 3 weeks, leaf samples were harvested and assayed. Both Western blot analysis and PAS-ELISA were effective at identifying samples positive for WSMV and HPV, both alone and in mixed infections. Western blot results showed that over the 2 years, 65% of the samples were positive for WSMV, 46% were positive for HPV, and mixed infections were found in 40% of the samples. HPV presence was verified with similar results from field collected plant samples. These levels of virus indicate an unexpectedly high incidence of HPV in wheat curl mite populations in Nebraska
Expected exponential loss for gaze-based video and volume ground truth annotation
Many recent machine learning approaches used in medical imaging are highly
reliant on large amounts of image and ground truth data. In the context of
object segmentation, pixel-wise annotations are extremely expensive to collect,
especially in video and 3D volumes. To reduce this annotation burden, we
propose a novel framework to allow annotators to simply observe the object to
segment and record where they have looked at with a \$200 eye gaze tracker. Our
method then estimates pixel-wise probabilities for the presence of the object
throughout the sequence from which we train a classifier in semi-supervised
setting using a novel Expected Exponential loss function. We show that our
framework provides superior performances on a wide range of medical image
settings compared to existing strategies and that our method can be combined
with current crowd-sourcing paradigms as well.Comment: 9 pages, 5 figues, MICCAI 2017 - LABELS Worksho
Exploring the Feasibility of Assessing Cultural Competence in Police Officers
Pathology, personality, and integrity-related construct assessments have been widely used in the selection of police officers. However, the incidence of police brutality and misconduct is still concerning. The present study explored the feasibility of the assessment of cultural competence in police officers. We explored the extent to which the change to the agency’s first ever Black CEO would affect cultural competence of the officers as well as incidence of misconduct. Results showed that scores on a cultural competence factor of an in-basket simulation used for promotional assessments at a state highway patrol agency were not predictive of either supervisor-rated performance or incidence of misconduct. Whereas results showed that misconduct was not predicted by the agency’s first Black CEO, cultural competence of the officers did increase after the change in command. Practical implications for law enforcement agencies and suggestions for future research are discussed
Retesting in a promotional process: Amount of time between tests accounting for magnitude of score increases
There are many reasons why an applicant may retake a selection test, whether it’s due to reasons outside of their control or perhaps their first test administration was unsuccessful. Research has shown that scores generally increase when applicants retake a test. However, research on situational judgment tests and in-basket simulations have been overshadowed by research on admissions tests, cognitive ability tests, and personality tests. Further, much research has focused on retesting effects during the initial selection process, but the current research aims to shed light on retesting effects during the promotional process. The literature shows conflicting findings regarding time between tests. While some literature says that more time between tests results in larger score increases, other research says that less time between tests results in larger score increases. The current study aims to clarify this conflicting history of research while closing the gap on types of assessments examined in the retesting literature. Results showed that more time between tests resulted in larger score gains for both the SJT and in the in-basket simulation. This is probably due to the nature of the test. SJTs and In-Baskets require a lot of job knowledge. Having more time on the job between tests would allow candidates to learn more and apply that on their second attempt at promotion. The literature on time between supports this notion. Studies that showed less time between tests resulted in larger score increases were assessing some aspect of cognitive ability. Perhaps for other tests less time between tests allows for greater score increases, but for job knowledge tests, more time between tests allows for these greater score increases. Practical implications and areas for future research are discussed. Keywords: retesting, promotion, in-basket, situational judgment tes
Parameter identification in a semilinear hyperbolic system
We consider the identification of a nonlinear friction law in a
one-dimensional damped wave equation from additional boundary measurements.
Well-posedness of the governing semilinear hyperbolic system is established via
semigroup theory and contraction arguments. We then investigte the inverse
problem of recovering the unknown nonlinear damping law from additional
boundary measurements of the pressure drop along the pipe. This coefficient
inverse problem is shown to be ill-posed and a variational regularization
method is considered for its stable solution. We prove existence of minimizers
for the Tikhonov functional and discuss the convergence of the regularized
solutions under an approximate source condition. The meaning of this condition
and some arguments for its validity are discussed in detail and numerical
results are presented for illustration of the theoretical findings
Single-parameter non-adiabatic quantized charge pumping
Controlled charge pumping in an AlGaAs/GaAs gated nanowire by
single-parameter modulation is studied experimentally and theoretically.
Transfer of integral multiples of the elementary charge per modulation cycle is
clearly demonstrated. A simple theoretical model shows that such a quantized
current can be generated via loading and unloading of a dynamic quasi-bound
state. It demonstrates that non-adiabatic blockade of unwanted tunnel events
can obliterate the requirement of having at least two phase-shifted periodic
signals to realize quantized pumping. The simple configuration without multiple
pumping signals might find wide application in metrological experiments and
quantum electronics.Comment: 4 pages, 4 figure
Direct evaluation of pure graph state entanglement
We address the question of quantifying entanglement in pure graph states.
Evaluation of multipartite entanglement measures is extremely hard for most
pure quantum states. In this paper we demonstrate how solving one problem in
graph theory, namely the identification of maximum independent set, allows us
to evaluate three multipartite entanglement measures for pure graph states. We
construct the minimal linear decomposition into product states for a large
group of pure graph states, allowing us to evaluate the Schmidt measure.
Furthermore we show that computation of distance-like measures such as relative
entropy of entanglement and geometric measure becomes tractable for these
states by explicit construction of closest separable and closest product states
respectively. We show how these separable states can be described using
stabiliser formalism as well as PEPs-like construction. Finally we discuss the
way in which introducing noise to the system can optimally destroy
entanglement.Comment: 23 pages, 9 figure
The Crisis of Finance-Dominated Capitalism in the Euro Area, Deficiencies in the Economic Policy Architecture, and Deflationary Stagnation Policies
* For a more detailed elaboration on the macroeconomic theory of finance-dominated capitalism, see the respective chapters in my book The Macroeconomics of Finance-dominated Capitalism – and Its Crisis (Hein 2012a). The present paper is based on this theory, and it extends and updates the analysis of the euro crisis I have presented in Hein (2012b). I would like to thank Achim Truger for his helpful comments and Matthias Mundt for his valuable research assistance. The Levy Economics Institute Working Paper Collection presents research in progress by Levy Institute scholars and conference participants. The purpose of the series is to disseminate ideas to and elicit comments from academics and professionals. Levy Economics Institute of Bard College, founded in 1986, is a nonprofit, nonpartisan, independently funded research organization devoted to public service. Through scholarship and economic research it generates viable, effective public policy responses to important economic problems that profoundly affect the quality of life in the United States and abroad
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