2,311 research outputs found
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
Cryogenic operation and room temperature application of an optically-pumped surface-emitting semiconductor laser
No full textThis thesis reports how the performance of a Vertical-External-Cavity Surface-Emitting Laser (VECSEL) can be significantly improved by cooling the active region to cryogenic temperatures. Also presented is the development of a room temperature, stable, high power, wavelength-tuneable, mode locked VECSEL and its subsequent implementation as a pump laser in a system designed to generate single photons.The VECSEL is a type of semiconductor laser capable of producing high output power in near diffraction-limited beams. The semiconductor gain region is highly temperature sensitive and the output power of a VECSEL is limited by non-radiative Auger recombination. Previous research has shown that by cooling the gain chip the gain per carrier is increased, the carrier density at the point of threshold lasing is reduced and the onset of Auger-recombination induced thermal rollover is delayed.This thesis presents a VECSEL that uses a gain chip cooled to 83 K. The device exhibited a 53% x 10% reduction in the incident pump power required to reach laser threshold, a 4-fold increase in incident pump power tolerated prior to the onset of thermal rollover, and an increase in output power of more than an order of magnitude when its performance was compared to operation at 293 K. A mode locked VECSEL using a gain chip held at 143 K is also reported. Prior to this research the coldest temperature at which a VECSEL gain chip had been operated was 248 K. This work shows that cryogenic temperatures can significantly improve VECSEL performance and begins a new direction in VECSEL research.The mode locked VECSEL has surpassed the performance of other types of mode locked semiconductor laser and is now approaching the performance of fibre and solidstate lasers. It has yet to be commercialised and so, to demonstrate that the mode locked VECSEL is now a mature, reliable technology, this thesis reports the development and implementation of a mode locked VECSEL as a pump laser in a single photon generation system. The system generates coincidental pairs of photons and, by detecting one photon in the pair, the presence of the companion will be heralded. The wavelength flexibility, excellent beam quality and high pulse repetition rate make the mode locked VECSEL ideal for both quantum state engineering and heralded single photon generation
Text-fig. 17. Biostratigraphic correlations of Moghara, Egypt, and Gebel Zelten, Libya, with inferred age ranges in millions of years. ELMA – European Land Mammal Age (MN – Mammal Neogene Zone) (Mein 1989), FS – East African Faunal Set (Pickford 1981). The double-headed arrow is the range of ages obtained by Strontium isotope dating analyses (Hassan et al. 2013). in New Suoid Fossils (Mammalia, Artiodactyla) From The Miocene Of Moghara, Egypt, And Gebel Zelten, Libya: Biochronological Implications
No full textText-fig. 17. Biostratigraphic correlations of Moghara, Egypt, and Gebel Zelten, Libya, with inferred age ranges in millions of years. ELMA – European Land Mammal Age (MN – Mammal Neogene Zone) (Mein 1989), FS – East African Faunal Set (Pickford 1981). The double-headed arrow is the range of ages obtained by Strontium isotope dating analyses (Hassan et al. 2013).Published as part of Pickford, Martin, Abdel Gawad, Mohamed, Hamdan, Mohamed, El-Barkooky, Ahmed N. & Al Riaydh, Mohammed H., 2021, New Suoid Fossils (Mammalia, Artiodactyla) From The Miocene Of Moghara, Egypt, And Gebel Zelten, Libya: Biochronological Implications, pp. 111-125 in Fossil Imprint 77 (1) on page 123, DOI: 10.37520/fi.2021.010, http://zenodo.org/record/716724
FSD-FS
No full textFSD-FS is a publicly-available database of human labelled sound events for few-shot learning. It spans across 143 classes obtained from the AudioSet Ontology and contains 43805 raw audio files collected from the FSD50K. FSD-FS is curated at the Centre for Digital Music, Queen Mary University of London.
Citation
If you use the FSD-FS dataset, please cite our paper and FSD50K.
@article{liang2022learning,
title={Learning from Taxonomy: Multi-label Few-Shot Classification for Everyday Sound Recognition},
author={Liang, Jinhua and Phan, Huy and Benetos, Emmanouil},
journal={arXiv preprint arXiv:2212.08952},
year={2022}
}
@ARTICLE{9645159, author={Fonseca, Eduardo and Favory, Xavier and Pons, Jordi and Font, Frederic and Serra, Xavier}, journal={IEEE/ACM Transactions on Audio, Speech, and Language Processing}, title={FSD50K: An Open Dataset of Human-Labeled Sound Events}, year={2022}, volume={30}, number={}, pages={829-852}, doi={10.1109/TASLP.2021.3133208}}
About FSD-FS
FSD-FS is an open database for multi-label few-shot audio classification containing 143 classes drawn from the FSD50K. It also inherits the AudioSet Ontology. FSD-FS follows the ratio 7:2:1 to split classes into base, validation, and evaluation sets, so there are 98 classes in the base set, 30 classes in the validation set, and 15 classes in the evaluation set (More details can be found in our paper).
LICENSE
FSD-FS are released in Creative Commons (CC) licenses. Same as FSD50K, each clip has its own license as defined by the clip uploader in Freesound, some of them requiring attribution to their original authors and some forbidding further commercial reuse. For more details, ones can refer to the link.
FILES
FSD-FS are organised in the structure:
root
|
└─── dev_base
|
└─── dev_val
|
└─── eval
REFERENCES AND LINKS
[1] Gemmeke, Jort F., et al. "Audio set: An ontology and human-labeled dataset for audio events." 2017 IEEE international conference on acoustics, speech and signal processing (ICASSP). IEEE, 2017. [paper] [link]
[2] Fonseca, Eduardo, et al. "Fsd50k: an open dataset of human-labeled sound events." IEEE/ACM Transactions on Audio, Speech, and Language Processing 30 (2021): 829-852. [paper] [code
Thoughts about “Assessment of Quality of Diabetic Care in Teaching Hospitals in Ethiopia: In Comparison to International Guidelines” [Letter]
No full textSabrina Shahid, Mahdi Sadeghi, Fathima Simla Mohamed Sajahan Medical Education, King’s College London, London, UKCorrespondence: Mahdi Sadeghi, King’s College London, Guy’s Campus, Great Maze Pond, London, SE1 1UL, UK, Email [email protected]
Tissue architecture of the anterior pituitary showing the epithelial cell cords with hormonal cells and folliculo-stellate (FS) cells, the capillaries (C) with fenestrated endothelial cells (EC) and connective tissue (CT)
No full text<p><b>Copyright information:</b></p><p>Taken from "Paracrinicity: The Story of 30 Years of Cellular Pituitary Crosstalk"</p><p></p><p>Journal of Neuroendocrinology 2008;20(1):1-70.</p><p>Published online Jan 2008</p><p>PMCID:PMC2229370.</p><p>© 2008 The Author. Journal Compilation © 2008 Blackwell Publishing Ltd</p> The cell cords are a cluster of endocrine cells surrounding an aggregate of FS cells that make a follicle (F). FS cells also make a meshwork between the hormonal cells, making junctions among each other (thick lines) and extending foot processes (f) ending on the basal membrane (BM) in the periphery of the cord. The cords are surrounded by BM, which may have extensions between some cells. A second BM surrounds the capillary vessels and between these two some connective tissue resides. Small and larger lacunae are present between hormonal cells. Paracrine substances may circulate from cell-to-cell but also could be released in these lacunae and reach more remote places. FS cells make gap junctions mostly among each other, but occasionally also with some hormonal cells. Hormonal cells can make interdigitations with FS cells (small arrows) to favour cell-to-cell communication. Adapted from Vila-Porcile ()
Adaptive pulse compression for transform-limited 15-fs high-energy pulse generation
No full textWe demonstrate the use of a deformable-mirror pulse shaper, combined with an evolutionary optimization algorithm, to correct high-order residual phase aberrations in a 1-mJ, 1-kHz, 15-fs laser amplifier. Frequency resolved optical gating measurements reveal that the output pulse duration of 15.2 fs is within our measurement error of the theoretical transform limit. This technique significantly reduces the pulse duration and the temporal prepulse energy of the pulse while increasing the peak intensity by 26%. It is demonstrated, for what is believed to be the first time, that the problem of pedestals in laser amplifiers can be addressed by spectral-domain correction
Self-compression of 4.9 µm pulses to sub-40 fs with 2 mJ energy in Zinc Sulfide
No full textNonlinear self-compression of few-cycle multi-mJ pulses at 4.9 µm in ZnS is presented. 80 fs input pulses are compressed to 37 fs with 2.1 mJ energy at a 1 kHz repetition rate. © 2024 The Author(s
Interleukin-1 receptor antagonist and interleukin-1β-511 gene polymorphisms among Egyptian children with febrile seizures
No full textFebrile seizures (FSs) are the most common form of childhood seizures. The higher levels of pro-inflammatory cytokines in children may induce seizures, and alternatively, higher levels of anti-inflammatory cytokines may act as a defense mechanism against seizures. We aimed to investigate whether interleukin (IL)-1β-511 C/T (pro-inflammatory cytokine) (rs16944) and IL-1 receptor antagonist (IL-1Ra) (an anti-inflammatory cytokine) gene polymorphisms could be
used as markers for prediction of susceptibility to FSs. The current study included 22 patients with FSs and 22 normal control subjects. All patients were subjected to thorough history taking, full neurological examination, electroencephalography, and peripheral blood sampling for genotype analyses.
Detection of IL-1Ra gene polymorphisms was done using polymerase chain reaction (PCR), while a restriction fragment length polymorphism analysis of the PCR products was used for the detection of IL-1β-511 C/T gene polymorphisms. The mean age of onset of first febrile seizures was 15.7 months.
Eighteen (81.8 %) cases had the criteria of complex FSs. Frequencies of alleles C and T for IL-1β-511 were 26/44 and 18/44, respectively, in FS patients and 22/44 for both in the control subjects. The CC genotype was significantly more common in the FS patients than in the control group. The IL-1Ra-I homozygote was more frequent in patients with FSs than in healthy controls. The IL-1Ra homozygous I/I and IL-1β-511 CC gene polymorphisms are associated with a higher susceptibility to febrile seizures, which may be useful markers for predicting the development of febrile seizures
- …
