8,124 research outputs found
New results on the spectroscopy of XYZ states from LHC experiments
The main results from LHC experiments on XYZ charmonium-like candidates are
summarized.Comment: to appear in the proceedings of The 5th International Workshop on
Charm Physics (Charm 2012
INTERRELATED BANK STRATEGIES, FINANCIAL FRAGILITY AND CREDIT EXPANSION: A POST KEYNESIAN APPROACH
This paper aims at clarifying the relationship between individual bank and banking industry behavior in credit expansion. We argue that the balance sheet structure of an individual bank is only partially determined by its management decision about how aggressively to expand credit; it is also determined by the balance sheet positions of other banks. This relationship is explicitly shown by a disaggregation of the variable that enters into the simple money multiplier. The approach developed here opens a way to integrating the micro and macro levels in a Keynesian banking-system analysis.
Amplitude analysis of four-body decays using a massively-parallel fitting framework
The GooFit Framework is designed to perform maximum-likelihood fits for
arbitrary functions on various parallel back ends, for example a GPU. We
present an extension to GooFit which adds the functionality to perform
time-dependent amplitude analyses of pseudoscalar mesons decaying into four
pseudoscalar final states. Benchmarks of this functionality show a significant
performance increase when utilizing a GPU compared to a CPU. Furthermore, this
extension is employed to study the sensitivity on the mixing
parameters and in a time-dependent amplitude analysis of the decay . Studying a sample of 50 000 events and setting
the central values to the world average of and , the statistical sensitivities of and are determined
to be and .Comment: Proceedings of the 22nd International Conference on Computing in High
Energy and Nuclear Physics, CHEP 201
Benchmarking the Security Protocol and Data Model (SPDM) for component authentication
Efforts to secure computing systems via software traditionally focus on the
operating system and application levels. In contrast, the Security Protocol and
Data Model (SPDM) tackles firmware level security challenges, which are much
harder (if at all possible) to detect with regular protection software. SPDM
includes key features like enabling peripheral authentication, authenticated
hardware measurements retrieval, and secure session establishment. Since SPDM
is a relatively recent proposal, there is a lack of studies evaluating its
performance impact on real-world applications. In this article, we address this
gap by: (1) implementing the protocol on a simple virtual device, and then
investigating the overhead introduced by each SDPM message; and (2) creating an
SPDM-capable virtual hard drive based on VirtIO, and comparing the resulting
read/write performance with a regular, unsecured implementation. Our results
suggest that SPDM bootstrap time takes the order of tens of milliseconds, while
the toll of introducing SPDM on hard drive communication highly depends on
specific workload patterns. For example, for mixed random read/write
operations, the slowdown is negligible in comparison to the baseline unsecured
setup. Conversely, for sequential read or write operations, the data encryption
process becomes the bottleneck, reducing the performance indicators by several
orders of magnitude.Comment: 10 pages, 8 figure
The Analysis of Commercially Available Kratom Products in Richmond, Virginia
Kratom is a novel psychoactive substance that has gained popularity within the past ten years. Originating from Southeast Asia, the leaves of the Mitragyna speciosa tree contain two principal alkaloids, mitragynine and 7-hydroxymitragynine, that play a key role in opioid-like effects. Twenty-nine kratom products were obtained from tobacco shops in the Richmond, Virginia area, including powders, teas, capsules, extracts, and a carbonated beverage. Samples were analyzed using Direct Analysis in Real Time-Mass Spectrometry (DART-MS) for kratom alkaloids, labeled ingredients, and other possible organic compounds. Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) was used to quantitate aluminum, arsenic, copper, iron, magnesium, nickel, and lead with yttrium as the internal standard. Mitragynine and 7-hydroxymitragynine were present in every kratom sample. Kratom tea samples were found to have up to 20 times the tolerable upper intake of manganese. Overexposure to manganese can lead to Parkinsonian symptoms including tremors, dystonia, and facial muscle spasms. Gas Chromatography-Mass Spectrometry (GC-MS) was used to qualitatively confirm the presence of alkaloids and differentiate diastereomers. One non-kratom product was analyzed and was found to contain phenibut, an anxiolytic and nootropic substance. Phenibut was not listed on the label of this product. This work contributes to bring attention to the absence of quality control standards on kratom manufacturers as well as proper labeling of products sold at smoke and tobacco shops, prompting a public health concern due to the association of toxic metal levels in commercial kratom products.https://scholarscompass.vcu.edu/gradposters/1175/thumbnail.jp
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