12,174 research outputs found
Twin Tunnels Stability Factors Fc, Fs and Fγ
No full textThis paper uses tunnel stability factors to estimate the minimum supporting pressure required to maintain the stability of twin circular tunnels drive side-by-side in drained cohesive-frictional soil. Similar to the bearing capacity equation proposed by Terzaghi, the proposed method is based on the three stability factors (Fc, Fs and Fγ) that are functions of the soil internal friction angle and the tunnel depth ratio. Unlike the case of a single tunnel, the centre-to-centre distance between the tunnels appears as a new parameter that must be considered in twin tunnel stability. For various spacing ratios (S/D) between the tunnels, non-dimensional tunnel stability factors (Fc, Fs and Fγ) are established for various depth ratios (C/D) and soil internal friction angles (Ø) using two-dimensional finite element limit analysis. For practical suitability, the results are presented in the form of dimensionless stability charts with the actual tunnel stability factors closely bracketed from above and below using upper and lower bound methods. As an extra validation, the results are compared with available solutions reported in the literature
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
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
Fault Current Limiter Controller for the Protection of Inverter Based Distributed Generation
No full textPower systems are becoming more vulnerable to different faults due to high current. This threat is increasing day by day due to the shift of power system from conventional generation to power electronic-based distributed generation. Such inverter-based distributed generation (IBDG) system is adopted to integrate different renewable energy sources especially solar photovoltaic (PV) to the grid. In this work bridge type fault current limiter (BFCL) has been suggested as a solution to the fault problem in IBDG system. The BFCL is connected to the AC side of the IBDG system and a proper controller is designed and implemented to control the reactance of BFCL. The voltage at the point of common coupling (PCC) is used as input of the BFCL activation controller. Outer controller loop is proposed for controlling the DC link voltage of IBDG, where an inner current controller is designed for controlling the power exchange between AC and DC sides of the IBDG. Both the balanced and unbalanced faults are applied in the AC side of the IBDG system to demonstrate the effectiveness of the suggested controller. A great improvement in the system performance is observed with the proposed fault current limiter based control strategy. The proposed strategy is also compared with the traditional control strategy and it is observed that the proposed one outperforms the classical one.No Full Tex
Two-dimensional tunnel heading stability factors Fc, Fs and Fγ
No full textThis paper investigates the use of stability factors to estimate tunnel heading pressures. The primary method adopted is a conventional equation based on the soil property and stability factors, analogous to the bearing capacity factors (Nc, Ns and Nγ) of strip footings. The finite element limit analysis (FELA) is employed to determine rigorous upper bound (UB) and lower bound (LB) solutions of stability factors (Fc, Fs and Fγ), which are functions of the depth ratio (C/D) and soil internal friction angle (Ø). The obtained results are compared and validated by using the finite difference analysis as well as other available published results in the literature. A number of examples are illustrated on how to use the factors to estimate tunnel heading pressures
Stability factors Fc, Fs, and Fγ for twin tunnels in three dimensions
No full textThis paper aims to study the three-dimensional (3D) tunnel heading pressure of twin circular tunnels in a drained cohesive–frictional soil using a stability factor approach and finite-element limit analysis (FELA). The primary concept adopted will be the use of a conventional equation that is similar to the traditional bearing capacity factors (e.g., Nc, Ns, and Nγ) in Terzaghi’s bearing capacity equation. For various spacing ratios (S/D) between the tunnels, the stability of the tunnels is expressed in terms of nondimensional tunnel stability factors (e.g., Fc, Fs, and Fγ), which are functions of the depth ratio (C/D) and soil internal friction angle (ϕ). For conciseness, the results will be presented in charts and tables with the tunnel stability factors that used the rigorous FELA upper (UB) and lower bound (LB) solutions
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 ()
ANALISIS KEMANDIRIAN BELAJAR DITINJAU DARI MONITORING ORANG TUA DALAM VIRTUAL LEARNING PADA SISWA KELAS VIII MTs AL WASILAH LEMO
No full textHal mendasar pada penelitian ini, terletak pada kemandirian belajar siswa pada masa pembelajaran jarak jauh yang di topang oleh monitoring orang tua. Penelitian ini merupakan penelitian deskriptif yang bertujuan untuk Mendeskripsikan Kemandirian Belajar Ditinjau Dari Monitoring Orang Tua Dalam Virtual Learning Pada Siswa KelasVIII MTs Al Wasilah Lemo. Subjek penelitian ini adalah Siswa kelas VIII diambil 3 orang Siswa yang dipilih secara sengaja atau purposive sampling, berdasarkan 3 kategori yaitu (1) peserta didik berkemandirian tinggi, (2) berkemandirian sedang, dan (3) berkemandirian rendah. Instrumen penelitian yang digunakan adalah angket dan wawancara. Berdasarkan dari angket yang diberikan kepada peserta didik pada subjek 1 (inisial NI) deperoleh skor total sebesar 46 dari 21 item pernyataan dengan nilai perolehan sebesar 43,81 berada pada kategori rendah. wawancara dengan orang tua NI, menunjukan hasil dimana orang tua tersebut kurang memberikan motivasi dan dorongan untuk aktif belajar. Pada peserta didik atau subjek 2 (inisial Iw) deperoleh nilai perolehan sebesar 62,85. berada pada kategori sedang. Hasil wawancara dengan orang tua Iw, menunjukan hasil dimana orang tua tersebut kurang memberikan dorongan untuk aktif belajar, cara menegurnya kurang baik, sehingga anak kurang terbuka kepada orang tua mengenai masalah tugas sekolahnya. Pada subjek 3 (inisial Fs) deperoleh nilai perolehan sebesar 83,81. berada pada kategori tinggi, sejalan dengan hasil wawancara dengan orang tua Fs, menunjukan hasil dimana orang tua tersebut sangat memperhatikan pendidikan anaknya, dengan menamkan sifat yang mandiri dalam menyelesaikan masalah atau pekerjaan rumah, dengan membiasakan diri mulai sejak dini
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
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