61 research outputs found
Ethical sourcing : an analysis of the literature and implications for future research
The purpose of this study is to present a rigorous, focused review on how this field of ethical sourcing research has grown and evolved over the decades, providing implications for future research. We combine two research methodologies in this study: a systematic literature review and a citation network analysis. The former is used as a scientific tool to select the most relevant ethical sourcing articles, while the latter is then applied as a research technique to analyse these selected articles. Such a combined approach allows for a rigorous investigation into this field of research in a more scientific and objective way. Based on this approach, we identify (1) distinctive features of ethical sourcing studies such as growth trends and content issues; (2) important articles that have played a significant role in developing this field; (3) evolutionary paths that show how its knowledge has been created and transferred; (4) emerging trends that have received growing attention in the recent literature; (5) main research areas that underlie the entire ethical sourcing studies; and (6) major implications that need to be pursued in future research. The results of this study provide not only the current status of the literature but also the patters of evolution in this field of research, thus contributing to the existing literature
Axion dark matter search using the storage ring EDM method
We propose using the storage ring EDM method to search for the axion dark
matter induced EDM oscillation in nucleons. The method uses a combination of B
and E-fields to produce a resonance between the spin precession frequency
and the background axion field oscillation to greatly enhance sensitivity to
it. An axion frequency range from Hz to 100 MHz can in principle be
scanned with high sensitivity, corresponding to an range of
GeV GeV, the breakdown scale of the global symmetry
generating the axion or axion like particles (ALPs)
Josephson Parametric Amplifier in Axion Experiments
The axion is a hypothetical particle, a promising candidate for dark matter,
and a solution to the strong CP problem. Axion haloscope search experiments
deal with a signal power comparable to noise uncertainty at millikelvin
temperature. We use a flux-driven Josephson parametric amplifier (JPA) with the
aim of approaching a noise level near the theoretically allowed limit of half
quanta. In our measurements to characterize the JPA we have found the added
noise to the system with a JPA as the first-stage amplifier to be lower than
110 mK at the frequencies from 0.938 GHz to 0.963 GHz.Comment: to be published in JPS Conference Proceedings (LT29
Search for the Sagittarius Tidal Stream of Axion Dark Matter around 4.55 eV
We report the first search for the Sagittarius tidal stream of axion dark
matter around 4.55 eV using CAPP-12TB haloscope data acquired in March of
2022. Our result excluded the Sagittarius tidal stream of
Dine-Fischler-Srednicki-Zhitnitskii and Kim-Shifman-Vainshtein-Zakharov axion
dark matter densities of and GeV/cm,
respectively, over a mass range from 4.51 to 4.59 eV at a 90% confidence
level.Comment: 6 pages, 7 Figures, PRD Letter accepte
Extensive search for axion dark matter over 1\,GHz with CAPP's Main Axion eXperiment
We report an extensive high-sensitivity search for axion dark matter above
1\,GHz at the Center for Axion and Precision Physics Research (CAPP). The
cavity resonant search, exploiting the coupling between axions and photons,
explored the frequency (mass) range of 1.025\,GHz (4.24\,eV) to 1.185\,GHz
(4.91\,eV). We have introduced a number of innovations in this field,
demonstrating the practical approach of optimizing all the relevant parameters
of axion haloscopes, extending presently available technology. The CAPP 12\,T
magnet with an aperture of 320\,mm made of NbSn and NbTi superconductors
surrounding a 37-liter ultralight-weight copper cavity is expected to convert
DFSZ axions into approximately microwave photons per second. A powerful
dilution refrigerator, capable of keeping the core system below 40\,mK,
combined with quantum-noise limited readout electronics, achieved a total
system noise of about 200\,mK or below, which corresponds to a background of
roughly photons per second within the axion bandwidth. The
combination of all those improvements provides unprecedented search
performance, imposing the most stringent exclusion limits on axion--photon
coupling in this frequency range to date. These results also suggest an
experimental capability suitable for highly-sensitive searches for axion dark
matter above 1\,GHz.Comment: A detailed axion dark matter article with 27 pages, 22 figure
Logistics service provider selection for disaster preparation: a socio-technical systems perspective
Since 1990s, the world has seen a lot of advances in providing humanitarian aid through sophisticated logistics operations. The current consensus seems to be that humanitarian relief organizations (HROs) can improve their relief operations by collaborating with logistics service providers (CLSPs) in the commercial sector. The question remains: how can HROs select the most appropriate CLSP for disaster preparation? Despite its practical significance, no explicit effort has been done to identify the criteria/factors in prioritising and selecting a CLSP for disaster relief. The present study aims to address this gap by consolidating the list of criteria from a socio-technical systems (STS) perspective. Then, to handle the interdependence among the criteria derived from the STS, we develop a hybrid multi-criteria decision making model for CLSP selection in the disaster preparedness stage. The proposed model is then evaluated by a real-life case study, providing insights into the decision-makers in both HROs and CLSPs
Electric dipole moments and the search for new physics
Static electric dipole moments of nondegenerate systems probe mass scales for
physics beyond the Standard Model well beyond those reached directly at high
energy colliders. Discrimination between different physics models, however,
requires complementary searches in atomic-molecular-and-optical, nuclear and
particle physics. In this report, we discuss the current status and prospects
in the near future for a compelling suite of such experiments, along with
developments needed in the encompassing theoretical framework.Comment: Contribution to Snowmass 2021; updated with community edits and
endorsement
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