1,532 research outputs found
Ground State Electroluminescence
Electroluminescence, the emission of light in the presence of an electric
current, provides information on the allowed electronic transitions of a given
system. It is commonly used to investigate the physics of strongly-coupled
light-matter systems, whose eigenfrequencies are split by the strong coupling
with the photonic field of a cavity. Here we show that, together with the usual
electroluminescence, systems in the ultrastrong light-matter coupling regime
emit a uniquely quantum radiation when a flow of current is driven through
them. While standard electroluminescence relies on the population of excited
states followed by spontaneous emission, the process we describe herein
extracts bound photons by the dressed ground state and it has peculiar features
that unequivocally distinguish it from usual electroluminescence.Comment: 6 pages, 3 figure
Multielectron Ground State Electroluminescence
The ground state of a cavity-electron system in the ultrastrong coupling
regime is characterized by the presence of virtual photons. If an electric
current flows through this system, the modulation of the light-matter coupling
induced by this non-equilibrium effect can induce an extra-cavity photon
emission signal, even when electrons entering the cavity do not have enough
energy to populate the excited states. We show that this ground-state
electroluminescence, previously identified in a single-qubit system [Phys. Rev.
Lett. 116, 113601 (2016)] can arise in a many-electron system. The collective
enhancement of the light-matter coupling makes this effect, described beyond
the rotating wave approximation, robust in the thermodynamic limit, allowing
its observation in a broad range of physical systems, from a semiconductor
heterostructure with flat-band dispersion to various implementations of the
Dicke model.Comment: 32 pages (9+23), 9 figures (3+6
Collaborating with the Peace Corps to Maximize Student Learning in Group Counseling
This article explores a model partnership with a counseling education program and the Peace Corps. Counselor education students in a group counseling course developed and implemented a singular structured group session with clients not typically used (e.g., non-counseling students) to maximize student learning and implement group counseling skills. Group services were provided to returning Peace Corps volunteers with diverse cultural experiences who were in career and life transitions. In addition, the authors provide strategies for developing similar partnerships between counselor education programs and other agencies
Professional Counseling for Children With Sensory Processing Disorder
Sensory processing disorder is a complex neurological disorder affecting approximately 5–17% of the population, yet professional counselors often misunderstand and misdiagnose this disorder. A child’s academic, emotional and social functioning can be substantially impacted by sensory processing disorder; early diagnosis and treatment is crucial. In this article, the authors describe the disorder, discuss its impact on children and their families, and provide recommendations and resources for both mental health counselors and school counselors to utilize when serving this unique population with special needs. A case study is included, in addition to suggestions for treatment collaboration and advocacy on behalf of clients with sensory processing disorder
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Entwicklung eines Verfahrens zur automatischen Sammlung, ErschlieĂźung und Bereitstellung multimedialer Open-Access-Objekte mittels der Infrastruktur von Wikimedia Commons und Wikidata
Idee zum Projektantrag der TIB Hannover und Hochschule Hannover in der DFG-Ausschreibung: „Open-Access-Transformation“ vom 2.6.2014 im Bereich „Wissenschaftliche Literaturversorgungs- und Informationssysteme“ (LIS), eingereicht am 30.10.201
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Discovery and efficient reuse of technology pictures using Wikimedia infrastructures. A proposal
Multimedia objects, especially images and figures, are essential for the visualization and interpretation of research findings. The distribution and reuse of these scientific objects is significantly improved under open access conditions, for instance in Wikipedia articles, in research literature, as well as in education and knowledge dissemination, where licensing of images often represents a serious barrier.
Whereas scientific publications are retrievable through library portals or other online search services due to standardized indices there is no targeted retrieval and access to the accompanying images and figures yet. Consequently there is a great demand to develop standardized indexing methods for these multimedia open access objects in order to improve the accessibility to this material.
With our proposal, we hope to serve a broad audience which looks up a scientific or technical term in a web search portal first. Until now, this audience has little chance to find an openly accessible and reusable image narrowly matching their search term on first try - frustratingly so, even if there is in fact such an image included in some open access article
Quantum limit of photothermal cooling
We study the problem of cooling a mechanical oscillator using the
photothermal (bolometric) force. Contrary to previous attempts to model this
system, we take into account the noise effects due to the granular nature of
photon absorption. This allows us to tackle the cooling problem down to the
noise dominated regime and to find reasonable estimates for the lowest
achievable phonon occupation in the cantilever
Video summarization by group scoring
In this paper a new model for user-centered video summarization is presented. Involvement of more than one expert in generating the final video summary should be regarded as the main use case for this algorithm. This approach consists of three major steps. First, the video frames are scored by a group of operators. Next, these assigned scores are averaged to produce a singular value for each frame and lastly, the highest scored video frames alongside the corresponding audio and textual contents are extracted to be inserted into the summary. The effectiveness of this approach has been evaluated by comparing the video summaries generated by this system against the results from a number of automatic summarization tools that use different modalities for abstraction
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