6,389 research outputs found
Importance of Full and Accurate Descriptions of Varietal Differences in Growing Seed of Market Vegetables
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DarkHistory: A code package for calculating modified cosmic ionization and thermal histories with dark matter and other exotic energy injections
We present a new public Python package, DarkHistory, for computing the
effects of dark matter annihilation and decay on the temperature and ionization
history of the early universe. DarkHistory simultaneously solves for the
evolution of the free electron fraction and gas temperature, and for the
cooling of annihilation/decay products and the secondary particles produced in
the process. Consequently, we can self-consistently include the effects of both
astrophysical and exotic sources of heating and ionization, and automatically
take into account backreaction, where modifications to the
ionization/temperature history in turn modify the energy-loss processes for
injected particles. We present a number of worked examples, demonstrating how
to use the code in a range of different configurations, in particular for
arbitrary dark matter masses and annihilation/decay final states. Possible
applications of DarkHistory include mapping out the effects of dark matter
annihilation/decay on the global 21cm signal and the epoch of reionization, as
well as the effects of exotic energy injections other than dark matter
annihilation/decay. The code is available at
https://github.com/hongwanliu/DarkHistory with documentation at
https://darkhistory.readthedocs.io . Data files required to run the code can be
downloaded at https://doi.org/10.7910/DVN/DUOUWA .Comment: 40 pages, 17 figure
Heavy Dark Matter Annihilation from Effective Field Theory
We formulate an effective field theory description for SU(2) triplet
fermionic dark matter by combining nonrelativistic dark matter with gauge
bosons in the soft-collinear effective theory. For a given dark matter mass,
the annihilation cross section to line photons is obtained with 5% precision by
simultaneously including Sommerfeld enhancement and the resummation of
electroweak Sudakov logarithms at next-to-next-to-leading logarithmic order.
Using these results, we present more accurate and precise predictions for the
gamma-ray line signal from annihilation, updating both existing constraints and
the reach of future experiments.Comment: 5 pages, 2 figure
Condemnation in Federal District Courts- Proposed Rule Compared to Current Practice in Ohio under Conformity Act
Institutional accreditation liaisons in the Southern Association of Colleges and Schools region: characteristics, responsibilities, and force field analysis
The purpose of this study was to explore the Southern Association of Colleges and Schools Commission on Colleges’ role of Accreditation Liaison to (a) explore the characteristics of the professionals who fill the Accreditation Liaison role and (b) understand factors that support or challenge liaisons. Within the theoretical framework of Kurt Lewin’s Field Theory, a sequential mixed-methods research design was employed to collect data in two phases. The quantitative method in the first phase was an on-line survey. The instrument focused on respondents’ educational, professional, and demographic characteristics, as well as their roles, responsibilities, and practices as Accreditation Liaisons. The second, qualitative, phase of the study relied on telephone interviews for data collection. Confidential interviews served to clarify survey responses, as needed, and to collect data regarding the factors that drive/support or block/challenge respondents in their roles as Accreditation Liaisons. Research findings are presented for both phases of the study, followed by meta-inferences, recommendations for future research, and considerations for higher education professionals whose work focuses on accreditation
Mini-Conference on Hamiltonian and Lagrangian Methods in Fluid and Plasma Physics
A mini-conference on Hamiltonian and Lagrangian methods in fluid and plasma
physics was held on November 14, 2002, as part of the 44th meeting of the
Division of Plasma Physics of the American Physical Society. This paper
summarizes the material presented during the talks scheduled during the
Mini-Conference, which was held to honor Allan Kaufman on the occasion of his
75th birthday.Comment: 14 pages, conference summar
Textpresso for Neuroscience: Searching the Full Text of Thousands of Neuroscience Research Papers
Textpresso is a text-mining system for scientific literature. Its two major features are access to the full text of research papers and the development and use of categories of biological concepts as well as categories that describe or relate objects. A search engine enables the user to search for one or a combination of these categories and/or keywords within an entire literature. Here we describe Textpresso for
Neuroscience, part of the core Neuroscience Information Framework
(NIF). The Textpresso site currently consists of 67,500 full text
papers and 131,300 abstracts. We show that using categories in
literature can make a pure keyword query more refined and meaningful.
We also show how semantic queries can be formulated with categories
only. We explain the build and content of the database and describe the
main features of the web pages and the advanced search options. We also
give detailed illustrations of the web service developed to provide
programmatic access to Textpresso. This web service is used by the NIF
interface to access Textpresso. The standalone website of Textpresso
for Neuroscience can be accessed at
http://www.textpresso.org/neuroscience
Concentration of norms and eigenvalues of random matrices
We prove concentration results for operator norms of rectangular
random matrices and eigenvalues of self-adjoint random matrices. The random
matrices we consider have bounded entries which are independent, up to a
possible self-adjointness constraint. Our results are based on an isoperimetric
inequality for product spaces due to Talagrand.Comment: 15 pages; AMS-LaTeX; updated one referenc
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