cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reduced branched-chain aminotransferase activity alleviates metabolic vulnerability caused by dim light exposure at night in Drosophila
Creators: name: Kim, Mari
name: Son, Gwang-Ic
name: Cho, Yun-Ho
name: Kim, Gye-Hyeong
name: Yun, Sung-Eun
name: Kim, Young-Joon
name: Chung, Jongkyeong
name: Lee, Eunil
name: Park, Joong-Jean
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Neuroscience
subject: Physiology
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
classificationCode: 111714
subject: Mental Health
subject: Computational Biology

description: The rhythmic pattern of biological processes controlled by light over 24 h is termed the circadian rhythm. Disturbance of circadian rhythm due to exposure to light at night (LAN) disrupts the sleep-wake cycle and can promote cardiovascular disease, diabetes, cancer, and metabolic disorders in humans. We studied how dim LAN affects the circadian rhythm and metabolism using male Drosophila. Wild-type flies exposed to the dim light of 10 lux at night displayed altered 24 h sleep-wake behavior and expression patterns of circadian rhythm genes. In addition, the flies became more vulnerable to metabolic stress, such as starvation. Whole-body metabolite analysis revealed decreased amounts of branched-chain amino acids (BCAAs), such as isoleucine and valine. The dim light exposure also increased the expression of branched-chain amino acid aminotransferase (BCAT) and branched-chain α-keto acid dehydrogenase (BCKDC) enzyme complexes that regulate the metabolism of BCAAs. Flies with the Bcat heterozygous mutation were not vulnerable to starvation stress, even when exposed to dim LAN, and hemolymph BCAA levels did not decrease in these flies. Furthermore, the vulnerability to starvation stress was also suppressed when the Bcat expression level was reduced in the whole body, neurons, or fat body during adulthood using conditional GAL4 and RNA interference. Finally, the metabolic vulnerability was reversed when BCAAs were fed to wild-type flies exposed to LAN. Thus, short-term dim light exposure at night affects the expression of circadian genes and BCAA metabolism in Drosophila, implying a novel function of BCAAs in suppressing metabolic stress caused by disrupted circadian rhythm.
Topic-Guided Sampling For Data-Efficient Multi-Domain Stance Detection
Creators: name: Arakelyan, Erik
name: Arora, Arnav
name: Augenstein, Isabelle
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Information Retrieval (cs.IR)
subject: Computation (stat.CO)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Stance Detection is concerned with identifying the attitudes expressed by an author towards a target of interest. This task spans a variety of domains ranging from social media opinion identification to detecting the stance for a legal claim. However, the framing of the task varies within these domains, in terms of the data collection protocol, the label dictionary and the number of available annotations. Furthermore, these stance annotations are significantly imbalanced on a per-topic and inter-topic basis. These make multi-domain stance detection a challenging task, requiring standardization and domain adaptation. To overcome this challenge, we propose $\textbf{T}$opic $\textbf{E}$fficient $\textbf{St}$anc$\textbf{E}$ $\textbf{D}$etection (TESTED), consisting of a topic-guided diversity sampling technique and a contrastive objective that is used for fine-tuning a stance classifier. We evaluate the method on an existing benchmark of $16$ datasets with in-domain, i.e. all topics seen and out-of-domain, i.e. unseen topics, experiments. The results show that our method outperforms the state-of-the-art with an average of $3.5$ F1 points increase in-domain, and is more generalizable with an averaged increase of $10.2$ F1 on out-of-domain evaluation while using $\leq10\%$ of the training data. We show that our sampling technique mitigates both inter- and per-topic class imbalances. Finally, our analysis demonstrates that the contrastive learning objective allows the model a more pronounced segmentation of samples with varying labels.
description: ACL 2023 (Oral)
Kick it over - No. 14
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394

description: A social anarchist and anti-authoritarian quarterly publication. In this issue: Poisongirls interview, Bookchin's radical democracy, Chomsky on Central America, Jerk-off politics, Italian green movement, Mohawk world-view, Sexual anarchy.
Kick it over - No. 33
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657

description: A social anarchist and anti-authoritarian quarterly publication. In this issue: "Women and anarchism" In this issue: Do anarchists tolerate sexual harassment?, Power feminism, Grandview Girl's School.
Upper bound on the center-of-mass energy of the collisional Penrose process
Creators: name: Hod, Shahar
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Following the interesting work of Bañados, Silk, and West [Phys. Rev. Lett. {\bf 103}, 111102 (2009)], it is repeatedly stated in the physics literature that the center-of-mass energy, ${\cal E}_{\text{c.m}}$, of two colliding particles in a maximally rotating black-hole spacetime can grow unboundedly. For this extreme scenario to happen, the particles have to collide at the black-hole horizon. In this paper we show that Thorne's famous hoop conjecture precludes this extreme scenario from occurring in realistic black-hole spacetimes. In particular, it is shown that a new (and larger) horizon is formed {\it before} the infalling particles reach the horizon of the original black hole. As a consequence, the center-of-mass energy of the collisional Penrose process is {\it bounded} from above by the simple scaling relation ${\cal E}^{\text{max}}_{\text{c.m}}/2μ\propto(M/μ)^{1/4}$, where $M$ and $μ$ are respectively the mass of the central black hole and the proper mass of the colliding particles.
description: 5 pages
Quasi-real-time dual-comb spectroscopy with 750-MHz Yb:fiber combs
Creators: name: Tian, Haochen
name: Li, Runmin
name: Sterczewski, Lukasz A.
name: Kato, Takashi
name: Asahara, Akifumi
name: Minoshima, Kaoru
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present quasi-real-time dual-comb spectroscopy (DCS) using two Yb:fiber combs with ~750 MHz repetition rates. A computational coherent averaging technique is employed to correct timing and phase fluctuations of the measured dual-comb interferogram (IGM). Quasi-real-time phase correction of 1-ms long acquisitions occurs every 1.5 seconds and is assisted by coarse radio frequency (RF) phase-locking of an isolated RF comb mode. After resampling and global offset phase correction, the RF comb linewidth is reduced from 200 kHz to ~1 kHz, while the line-to-floor ratio increases 13 dB in power in 1 ms. Using simultaneous offset frequency correction in opposite phases, we correct the aliased RF spectrum spanning three Nyquist zones, which yields an optical coverage of ~180 GHz around 1.035 $μ$m probed on a sub-microsecond timescale. The absorption profile of gaseous acetylene is observed to validate the presented technique.
description: 11 pages, 7 figures
Registering open science research output & activities
Creators: name: Willighagen, Egon
Publisher: name: Zenodo
Year: 2023
Subjects: open science
research output

description: Presentation at the Maastricht Open Science Festival giving an overview of a few Open Science solutions to make research more visible. Abstract: "This session will discuss where and how you can report research output to make them findable and accessible. Output can be journal articles, software, data, etc. We will discuss various solution like the UM CRIS, the national Research Software Directory (RSD), and general purpose archives like Zenodo. Solutions to automate registration will also pass the stage, like the GitHub-Zenodo integration and the Zenodo-RSD integration. Of course, the role of identifiers and metadata standards can be expected too.".
Synthesis and characterisation of hydrogels based on poly (N-Vinylcaprolactam) with diethylene glycol diacrylate
Creators: name: Halligan, Elaine
name: Shu Hieng Tie, Billy
name: Colbert, Declan Mary
name: Alsaadi, Mohamad
name: Zhuo, Shuo
name: Keane, Gavin
name: Geever, Luke M.
Publisher: name: University of Limerick
Year: 2023
Subjects: Engineering

description: Poly (N-vinylcaprolactam) is a polymer that is biocompatible, water-soluble, thermally sensitive, non-toxic, and nonionic. In this study, the preparation of hydrogels based on Poly (N-vinylcaprolactam) with diethylene glycol diacrylate is presented. The N-Vinylcaprolactam-based hydrogels are synthesised by using a photopolymerisation technique using diethylene glycol diacrylate as a crosslinking agent, and Diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide as a photoinitiator. The structure of the polymers is investigated via Attenuated Total Reflectance–Fourier Transform Infrared Spectroscopy. The polymers are further characterised using differential scanning calorimetry and swelling analysis. This study is conducted to determine the characteristics of P (N-vinylcaprolactam) with diethylene glycol diacrylate, including the addition of Vinylacetate or N-Vinylpyrrolidone, and to examine the effects on the phase transition. Although various methods of free-radical polymerisation have synthesised the homopolymer, this is the first study to report the synthesis of Poly (N-vinylcaprolactam) with diethylene glycol diacrylate by using free-radical photopolymerisation, using Diphenyl (2, 4, 6-trimethylbenzoyl) phosphine oxide to initiate the reaction. FTIR analysis shows that the NVCL-based copolymers are successfully polymerised through UV photopolymerisation. DSC analysis indicates that increasing the concentration of crosslinker results in a decrease in the glass transition temperature. Swelling analysis displays that the lower the concentration of crosslinker present in the hydrogel, the quicker the hydrogels reach their maximum swelling ratio.
Exact power series solutions of the structure equations of the general relativistic isotropic fluid stars with linear barotropic and polytropic equations of state
Creators: name: Harko, T.
name: Mak, M. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Obtaining exact solutions of the spherically symmetric general relativistic gravitational field equations describing the interior structure of an isotropic fluid sphere is a long standing problem in theoretical and mathematical physics. The usual approach to this problem consists mainly in the numerical investigation of the Tolman-Oppenheimer-Volkoff and of the mass continuity equations, which describes the hydrostatic stability of the dense stars. In the present paper we introduce an alternative approach for the study of the relativistic fluid sphere, based on the relativistic mass equation, obtained by eliminating the energy density in the Tolman-Oppenheimer-Volkoff equation. Despite its apparent complexity, the relativistic mass equation can be solved exactly by using a power series representation for the mass, and the Cauchy convolution for infinite power series. We obtain exact series solutions for general relativistic dense astrophysical objects described by the linear barotropic and the polytropic equations of state, respectively. For the polytropic case we obtain the exact power series solution corresponding to arbitrary values of the polytropic index $n$. The explicit form of the solution is presented for the polytropic index $n=1$, and for the indexes $n=1/2$ and $n=1/5$, respectively. The case of $n=3$ is also considered. In each case the exact power series solution is compared with the exact numerical solutions, which are reproduced by the power series solutions truncated to seven terms only. The power series representations of the geometric and physical properties of the linear barotropic and polytropic stars are also obtained.
description: 21 pages, 3 figures, accepted for publication in Astrophys. Space Science
F.O.D.! maggotzine - No. 01
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Zines
valueUri: http://id.worldcat.org/fast/1919987
subject: Dissenters
valueUri: http://id.worldcat.org/fast/895401
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Civil disobedience
valueUri: http://id.worldcat.org/fast/862481

description: F.O.D.! Maggotzine was a zine released by Urania 235 from Toronto, Ontario. This first issue of the zine was released in 1989, and more issues followed in the 1990s. It was a photocopied, cut and paste publication and each issue had a different coloured cover. It is a large size zine (8 1/2 by 11 inch) which was used to feature full page illustrations and comics, along with articles, stories, interviews and many clippings of the strangest and most bizarre events reported on in newspapers and magazines. The editor is a tattoo artist, so the zine also includes many photos of his artistry. There are also reviews of recordings, magazines, books, comics and zines. The first issue was co-produced with Amy Grant and Dead. In issue two, the editor explains how they have both quit over the content in issue one, especially an illustration by Urania 235.
Exploring Critical Overdensity Thresholds in Inflationary Models of Primordial Black Holes Formation
Creators: name: Stamou, Ioanna D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we study the production of Primordial Black Holes (PBHs) from inflation in order to explain the Dark Mater (DM) in the Universe. The evaluation of the fractional PBHs abundance to DM is sensitive to the value of the threshold $\mathrm{δ_c}$ and the exact value of $\mathrm{δ_c}$ is sensitive to the specific shape of the cosmological fluctuations. Different mechanisms producing PBHs lead to different thresholds and hence to different fractional abundances of PBHs. In this study, we examine various classes of inflationary models proposed in the existing literature to elucidate the formation of PBHs and we evaluate numerically the associated threshold values. Having evaluated the thresholds we compute the abundances of PBHs to DM using the Press Schecter approach and the Peak Theory. Given the influence of different power spectra on the thresholds, we investigate whether these inflationary models can successfully account for a significant fraction of DM. Moreover, we provide suggested values for the critical threshold. By examining the interplay between inflationary models, threshold values, and PBH abundances, our study aims to shed light on the viability of PBHs as a candidate for DM and contributes to the ongoing discussion regarding the nature of DM in the Universe
description: 17 pages, 4 figures
Properties of Gamma-Ray Bursts Associated with Supernovae and Kilonovae
Creators: name: Li, Q. M.
name: Zhang, Z. B.
name: Han, X. L.
name: Zhang, K. J.
name: Xia, X. L.
name: Hao, C. T.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We systematically compare the temporal and spectral properties of 53 Supernova (SN)-associated and 15 Kilonova (KN)-associated Gamma-Ray Bursts (GRBs). We find that the spectral parameters of both types GRBs are identically and lognormally distributed, consistent with those normal GRBs. The bolometric luminosities of SN/GRBs and KN/GRBs have a triple form with the corresponding break luminosities of SN/GRBs are roughly two orders of magnitude larger than those of KN/GRBs. We build the power-law relations between the spectral lag and the luminosity of prompt $γ$-rays with indices of $-1.43\pm0.33$ for SN/GRBs and $-2.17\pm0.57$ for KN/GRBs in the laboratory frame, which are respectively coincident with the rest-frame values. We verify that both SN/GRBs and KN/GRBs comply with their own Amati relations that match those of long and short GRBs, respectively. Analyzing X-ray afterglows with good plateau segments, we build the power-law relations between the X-ray luminosity and the plateau time with an index of $-1.12\pm0.17$ for KN/GRBs and $-1.08\pm0.22$ for SN/GRBs, which can be well explained by the relativistic shock driven by an energy injection. The plots of luminosity-lag, Amati relation and luminosity-time show heavy overlap between the two types of GRBs, implying that they might share the same radiation mechanism despite originating from different progenitors or central engines.
description: 19 pages, 13 figures and 8 tables, accepted for publication in MNRAS
MODEL PREDICTIVE CONTROL FOR THE FOUR-PHASE TRAFFIC SIGNAL CONTROL SYSTEM TO URBAN MOBILITY
Creators: name: HABTAMU ADNO BELACHEW
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2020
Subjects: Model Predictive Control, Queue Length Queue Delay Signal Control Cycle Time Green Tim,Input- Output Constraints, Phase, urban traffic network.

description: Files are currently under embargo but will be publicly accessible after June 04, 2021
FPGA Technology Mapping Using Sketch-Guided Program Synthesis
Creators: name: Smith, Gus Henry
name: Kushigian, Ben
name: Canumalla, Vishal
name: Cheung, Andrew
name: Lyubomirsky, Steven
name: Porncharoenwase, Sorawee
name: Just, René
name: Bernstein, Gilbert Louis
name: Tatlock, Zachary
Publisher: name: arXiv
Year: 2024
Subjects: subject: Hardware Architecture (cs.AR)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: FPGA technology mapping is the process of implementing a hardware design expressed in high-level HDL (hardware design language) code using the low-level, architecture-specific primitives of the target FPGA. As FPGAs become increasingly heterogeneous, achieving high performance requires hardware synthesis tools that better support mapping to complex, highly configurable primitives like digital signal processors (DSPs). Current tools support DSP mapping via handwritten special-case mapping rules, which are laborious to write, error-prone, and often overlook mapping opportunities. We introduce Lakeroad, a principled approach to technology mapping via sketch-guided program synthesis. Lakeroad leverages two techniques -- architecture-independent sketch templates and semantics extraction from HDL -- to provide extensible technology mapping with stronger correctness guarantees and higher coverage of mapping opportunities than state-of-the-art tools. Across representative microbenchmarks, Lakeroad produces 2--3.5$\times$ the number of optimal mappings compared to proprietary state-of-the-art tools and 6--44$\times$ the number of optimal mappings compared to popular open-source tools, while also providing correctness guarantees not given by any other tool.
Approximative lookup-tables and arbitrary function rotations for facilitating NISQ-implementations of the HHL and beyond
Creators: name: Stougiannidis, Petros
name: Stein, Jonas
name: Bucher, David
name: Zielinski, Sebastian
name: Linnhoff-Popien, Claudia
name: Feld, Sebastian
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Emerging Technologies (cs.ET)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Many promising applications of quantum computing with a provable speedup center around the HHL algorithm. Due to restrictions on the hardware and its significant demand on qubits and gates in known implementations, its execution is prohibitive on near-term quantum computers. Aiming to facilitate such NISQ-implementations, we propose a novel circuit approximation technique that enhances the arithmetic subroutines in the HHL, which resemble a particularly resource-demanding component in small-scale settings. For this, we provide a description of the algorithmic implementation of space-efficient rotations of polynomial functions that do not demand explicit arithmetic calculations inside the quantum circuit. We show how these types of circuits can be reduced in depth by providing a simple and powerful approximation technique. Moreover, we provide an algorithm that converts lookup-tables for arbitrary function rotations into a structure that allows an application of the approximation technique. This allows implementing approximate rotation circuits for many polynomial and non-polynomial functions. Experimental results obtained for realistic early-application dimensions show significant improvements compared to the state-of-the-art, yielding small circuits while achieving good approximations.
Kick it over - No. 08
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394

description: A social anarchist and anti-authoritarian quarterly publication. In this issue: "1984 preview issue" In this issue: Welfare warfare, No cheating birth control, Politics of pot, Pork pressure in T.O., Aborting the right, Spy bill, Agent orange, Books & reciords, Porn again, Vancouver Five interview.
The lifespan of classical solutions of one dimensional wave equations with semilinear terms of the spatial derivative
Creators: name: Sasaki, Takiko
name: Takamatsu, Shu
name: Takamura, Hiroyuki
Publisher: name: arXiv
Year: 2023
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35L71 (Primary), 35B44 (Secondary)

description: This paper is devoted to the lifespan estimates of small classical solutions of the initial value problems for one dimensional wave equations with semilinear terms of the spatial derivative of the unknown function. It is natural that the result is same as the one for semilinear terms of the time-derivative. But there are so many differences among their proofs. Moreover, it is meaningful to study this problem in the sense that it may help us to investigate its blow-up boundary in the near future.
description: 10 pages
Exocometary gas structure, origin and physical properties around $β$ Pictoris through ALMA CO multi-transition observations
Creators: name: Matrà, L.
name: Dent, W. R. F.
name: Wyatt, M. C.
name: Kral, Q.
name: Wilner, D. J.
name: Panić, O.
name: Hughes, A. M.
name: de Gregorio-Monsalvo, I.
name: Hales, A.
name: Augereau, J. -C.
name: Greaves, J.
name: Roberge, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Recent ALMA observations unveiled the structure of CO gas in the 23 Myr-old $β$ Pictoris planetary system, a component that has been discovered in many similarly young debris disks. We here present ALMA CO J=2-1 observations, at an improved spectro-spatial resolution and sensitivity compared to previous CO J=3-2 observations. We find that 1) the CO clump is radially broad, favouring the resonant migration over the giant impact scenario for its dynamical origin, 2) the CO disk is vertically tilted compared to the main dust disk, at an angle consistent with the scattered light warp. We then use position-velocity diagrams to trace Keplerian radii in the orbital plane of the disk. Assuming a perfectly edge-on geometry, this shows a CO scale height increasing with radius as $R^{0.75}$, and an electron density (derived from CO line ratios through NLTE analysis) in agreement with thermodynamical models. Furthermore, we show how observations of optically thin line ratios can solve the primordial versus secondary origin dichotomy in gas-bearing debris disks. As shown for $β$ Pictoris, subthermal (NLTE) CO excitation is symptomatic of H$_2$ densities that are insufficient to shield CO from photodissociation over the system's lifetime. This means that replenishment from exocometary volatiles must be taking place, proving the secondary origin of the disk. In this scenario, assuming steady state production/destruction of CO gas, we derive the CO+CO$_2$ ice abundance by mass in $β$ Pic's exocomets to be at most $\sim$6%, consistent with comets in our own Solar System and in the coeval HD181327 system.
description: 21 pages, 13 figures, Accepted for publication in MNRAS
Vancouver ecomedia - No. 04
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Ecology
valueUri: http://id.worldcat.org/fast/901476
subject: FOS: Biological sciences
subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394
subject: Civil disobedience
valueUri: http://id.worldcat.org/fast/862481
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Green movement
valueUri: http://id.worldcat.org/fast/947621
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Dissenters
valueUri: http://id.worldcat.org/fast/895401

description: A monthly anarchist publication from Vancouver, British Columbia. In this issue: Urban camping -- Americas disappeared: the Green River murders -- Anarchist book fair -- "Sinking into anarchy": revolutionary unionism in Brazil -- Lubicon update.
Overcoming the Limitations of Localization Uncertainty: Efficient & Exact Non-Linear Post-Processing and Calibration
Creators: name: Sbeyti, Moussa Kassem
name: Karg, Michelle
name: Wirth, Christian
name: Nowzad, Azarm
name: Albayrak, Sahin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Robustly and accurately localizing objects in real-world environments can be challenging due to noisy data, hardware limitations, and the inherent randomness of physical systems. To account for these factors, existing works estimate the aleatoric uncertainty of object detectors by modeling their localization output as a Gaussian distribution $\mathcal{N}(μ,\,σ^{2})\,$, and training with loss attenuation. We identify three aspects that are unaddressed in the state of the art, but warrant further exploration: (1) the efficient and mathematically sound propagation of $\mathcal{N}(μ,\,σ^{2})\,$ through non-linear post-processing, (2) the calibration of the predicted uncertainty, and (3) its interpretation. We overcome these limitations by: (1) implementing loss attenuation in EfficientDet, and proposing two deterministic methods for the exact and fast propagation of the output distribution, (2) demonstrating on the KITTI and BDD100K datasets that the predicted uncertainty is miscalibrated, and adapting two calibration methods to the localization task, and (3) investigating the correlation between aleatoric uncertainty and task-relevant error sources. Our contributions are: (1) up to five times faster propagation while increasing localization performance by up to 1\%, (2) up to fifteen times smaller expected calibration error, and (3) the predicted uncertainty is found to correlate with occlusion, object distance, detection accuracy, and image quality.
description: This preprint has not undergone any post-submission improvements or corrections. Accepted to ECML-PKDD 2023
Kick it over - No. 10
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401

description: A social anarchist and anti-authoritarian quarterly publication. In this issue: Prostitutes speak out, Socialism: it fails us now, Betty Crocker promised, Beyond protest, Newfoundland: against modernity, Grenada, No Name Party, A fable of men and dogs, Gotcha: a book review, Civilian insecurity, When your friends freak out, Response to silence, Trivial pursuit of politics, Menstrual extraction.
A general algorithm for calculation of recombination losses in ionization chambers exposed to ion beams
Creators: name: Christensen, Jeppe brage
name: Tölli, Heiki
name: Bassler, Niels
Publisher: name: arXiv
Year: 2016
Subjects: subject: Medical Physics (physics.med-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Dosimetry with ionization chambers in clinical ion beams for radiation therapy requires correction for recombination effects. However, common radiation protocols discriminate between initial and general recombination and provide no universal correction method for the presence of both recombination types in ion beams of charged particles heavier than protons. Here, we present the open source code IonTracks, where the combined initial and general recombination effects in principle can be predicted for any ion beam with arbitrary particle-energy spectrum and temporal structure. IonTracks uses track structure theory to distribute the charge carriers in ion tracks. The charge carrier movements are governed by a pair of coupled differential equations, based on fundamental physical properties as charge carrier drift, diffusion, and recombination, which are solved numerically while the initial and general charge carrier recombination is computed. The algorithm is numerically stable and in accordance with experimentally validated theories for initial recombination in heavy ion tracks and general recombination in a proton beam. IonTracks is validated against the Jaffé's and Boag's theory of recombination in pulsed beams of multiple ion species. IonTracks is able to calculate the correction factor for initial and general recombination losses in parallel-plate ionization chambers. Even if only few experimental data on recombination effects in ionization chambers are available today, the universal concept of IonTracks is not limited to the ions investigated here. Future experimental investigations of recombination in pulsed and possibly also continuous ion beams may be conducted with IonTracks, which ultimately may lead to a more precise prediction of recombination factors in complex radiation fields.
description: 10 pages, 4 figures
The impact of baryonic potentials on the gravothermal evolution of self-interacting dark matter haloes
Creators: name: Zhong, Yi-Ming
name: Yang, Daneng
name: Yu, Hai-Bo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The presence of a central baryonic potential can have a significant impact on the gravothermal evolution of self-interacting dark matter (SIDM) haloes. We extend a semi-analytical fluid model to incorporate the influence of a static baryonic potential and calibrate it using controlled N-body simulations. We construct benchmark scenarios with varying baryon concentrations and different SIDM models, including constant and velocity-dependent self-interacting cross sections. The presence of the baryonic potential induces changes in SIDM halo properties, including central density, core size, and velocity dispersion, and it accelerates the halo's evolution in both expansion and collapse phases. Furthermore, we observe a quasi-universality in the gravothermal evolution of SIDM haloes with the baryonic potential, resembling a previously known feature in the absence of the baryons. By appropriately rescaling the physical quantities that characterize the SIDM haloes, the evolution of all our benchmark cases exhibits remarkable similarity. Our findings offer a framework for testing SIDM predictions using observations of galactic systems where baryons play a significant dynamical role.
description: 9 pages + references + appendices, 10 figures, 3 tables; v3: as published in MNRAS
Shor's Factoring Algorithm and Modular Exponentiation Operators
Creators: name: Singleton, Robert L
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: These are pedagogical notes on Shor's factoring algorithm, which is a quantum algorithm for factoring very large numbers (of order of hundreds to thousands of bits) in polynomial time. In contrast, all known classical algorithms for the factoring problem take an exponential time to factor large numbers. In these notes, we assume no prior knowledge of Shor's algorithm beyond a basic familiarity with the circuit model of quantum computing. The literature is thick with derivations and expositions of Shor's algorithm, but most of them seem to be lacking in essential details, and none of them provide a pedagogical presentation. We develop the theory of modular exponentiation (ME) operators in some detail, one of the fundamental components of Shor's algorithm, and the place where most of the quantum resources are deployed. We also discuss the post-quantum processing and the method of continued fractions, which is used to extract the exact period of the modular exponential function from the approximately measured phase angles of the ME operator. The manuscript then moves on to a series of examples. We first verify the formalism by factoring N=15, the smallest number accessible to Shor's algorithm. We then proceed to factor larger numbers, developing a systematic procedure that will find the ME operators for any semi-prime $N = p \times q$ (where $q$ and~$p$ are prime). Finally, we factor the numbers N=21, 33, 35, 143, 247 using the Qiskit simulator. It is observed that the ME operators are somewhat forgiving, and truncated approximate forms are able to extract factors just as well as the exact operators. This is because the method of continued fractions only requires an approximate phase value for its input, which suggests that implementing Shor's algorithm might not be as difficult as first suspected.
description: 108 pages, 63 figures. Published version
RL-Based Hyperparameter Selection for Spectrum Sensing With CNNs
Creators: name: Mehrabian, Amir
name: Sabbaghian, Maryam
name: Yanikomeroglu, Halim
Publisher: name: arXiv
Year: 2024
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Selection of hyperparameters in deep neural networks is a challenging problem due to the wide search space and emergence of various layers with specific hyperparameters. There exists an absence of consideration for the neural architecture selection of convolutional neural networks (CNNs) for spectrum sensing. Here, we develop a method using reinforcement learning and Q-learning to systematically search and evaluate various architectures for generated datasets including different signals and channels in the spectrum sensing problem. We show by extensive simulations that CNN-based detectors proposed by our developed method outperform several detectors in the literature. For the most complex dataset, the proposed approach provides 9% enhancement in accuracy at the cost of higher computational complexity. Furthermore, a novel method using multi-armed bandit model for selection of the sensing time is proposed to achieve higher throughput and accuracy while minimizing the consumed energy. The method dynamically adjusts the sensing time under the time-varying condition of the channel without prior information. We demonstrate through a simulated scenario that the proposed method improves the achieved reward by about 20% compared to the conventional policies. Consequently, this study effectively manages the selection of important hyperparameters for CNN-based detectors offering superior performance of cognitive radio network.
Vancouver ecomedia - No. 01
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Green movement
valueUri: http://id.worldcat.org/fast/947621
subject: Ecology
valueUri: http://id.worldcat.org/fast/901476
subject: FOS: Biological sciences
subject: Civil disobedience
valueUri: http://id.worldcat.org/fast/862481
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387
subject: Dissenters
valueUri: http://id.worldcat.org/fast/895401
subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394

description: A monthly anarchist publication from Vancouver, British Columbia. In this issue: Fight at the gardens -- Cops on the beat -- Shell busters -- Save the workers too.
Renormalization group summation and analytic continuation from spacelike to timeline regions
Creators: name: Khan, M. S. A. Alam
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Analytic continuation of the perturbative series from spacelike to timelike regions is performed using renormalization group summed perturbation theory (RGSPT). This method provides an all-order summation of kinematic ``$π^2$-terms'' accessible from a given order of a perturbative series. The impact of the summation of these terms is studied for Higgs boson decay and electromagnetic R-ratio in the perturbative QCD. Results obtained using RGSPT have improved convergence behavior in addition to significantly reduced renormalization scale dependence compared to fixed-order perturbation theory (FOPT). The higher-order behavior using the Padé approximant is also studied for processes considered.
description: 25 pages and 10 figures. References added, figures are updated, and minor text corrections. Version Published in PhysRevD
Kick it over - No. 20
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Anarchism--Periodicals
valueUri: http://id.worldcat.org/fast/808394
subject: Social movements
valueUri: http://id.worldcat.org/fast/1122657
subject: Anarchists
valueUri: http://id.worldcat.org/fast/808401
subject: Anarchism
valueUri: http://id.worldcat.org/fast/808387

description: A social anarchist and anti-authoritarian quarterly publication. In this issue: "A special social ecology supplement" In this issue: Jamaican feminism, Reggae on the reservation, Dance as a feminist project, George Woodcock on anarchism, Coping with gay grief.
Anisotropy in the all-sky distribution of galaxy morphological types
Creators: name: Javanmardi, Behnam
name: Kroupa, Pavel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the first study of the isotropy of the distribution of morphological types of galaxies in the Local Universe out to around 200 Mpc using more than 60,000 galaxies from the HyperLeda database. We divide the sky into two opposite hemispheres and compare the abundance distribution of the morphological types, $T$, using the Kolmogorov-Smirnov (KS) test. This is repeated for different directions in the sky and the KS statistic as a function of sky coordinates is obtained. For three samples of galaxies within around 100, 150, and 200 Mpc, we find a significant hemispherical asymmetry with a vanishingly small chance of occurring in an isotropic distribution. Astonishingly, regardless of this extreme significance, the hemispherical asymmetry is aligned with the Celestial Equator at the 97.1-99.8% and with the Ecliptic at the 94.6-97.6% confidence levels, estimated using a Monte Carlo analysis. Shifting $T$ values randomly within their uncertainties has a negligible effect on this result. When a magnitude limit of $B\leq 15$ mag is applied, the sample within 100 Mpc shows no significant anisotropy after random shifting of $T$. However, the direction of the asymmetry in the samples within 150 and 200 Mpc and $B\leq 15$ mag is found to be within an angular separation of 32 degrees from $(l,b)=(123.7, 24.6)$ with 97.2% and 99.9% confidence levels, respectively. This direction is only 2.6 degrees away from the Celestial North Pole. Unless the Local Universe has a significant anisotropic distribution of galaxy types aligned with the orientation or the orbit of the Earth (which would be a challenge for the Cosmological Principle), our results show that there seems to be a systematic bias in the classification of galaxy morphological types between the data from the Northern and the Southern Equatorial sky. Further studies are absolutely needed to find out the exact source of this anisotropy.
description: Accepted for Publication in Astronomy & Astrophysics. 12 pages, 8 figures, 4 tables
OPTIMIZATION OF HYDROPOWER GENERATION POTENTIAL OF THE DAM; IN THE CASE OF ARJO DEDESSA DAM, WESTERN ETHIOPIA.
Creators: name: CHIMDESA REGASA KISHE
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2020
Subjects: Arjo Dedessa Dam, Optimization, Hydropower potential, linear programming, LINGO

description: Files are currently under embargo but will be publicly accessible after June 04, 2021
An analysis of the TDNNS method using natural norms
Creators: name: Pechstein, Astrid S.
name: Schöberl, Joachim
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N30

description: The Tangential-Displacement Normal-Normal-Stress (TDNNS) method is a finite element method for mixed elasticity. As the name suggests, the tangential component of the displacement vector as well as the normal-normal component of the stress are the degrees of freedom of the finite elements. The TDNNS method was shown to converge of optimal order, and to be robust with respect to shear and volume locking. However, the method is slightly nonconforming, and an analysis with respect to the natural norms of the arising spaces was still missing. We present a sound mathematical theory of the infinite dimensional problem using the space H(curl) for the displacement. We define the space H(div div) for the stresses and provide trace operators for the normal-normal stress. Moreover, the finite element problem is shown to be stable with respect to the H(curl) and a discrete H(div div) norm. A-priori error estimates of optimal order with respect to these norms are obtained.
Optimal Premium Pricing in a Competitive Stochastic Non-Life Insurance Market: Game Theoretic Approaches
Creators: name: MOURDOUKOUTAS, FOTIOS
Publisher: name: Monash University
Year: 2023
Subjects: Insurance studies

description: This thesis aims to provide an objective analysis of the underwriting process and the strategic interactions of various market participants in the general insurance industry. Models are utilised to characterise the risk preferences of insurers as well as to capture the relationship between pricing policies and volume of exposure. The distributional aspects of the underlying risks are taken into consideration to constrain insurers to be solvent and meet the technical requirements as imposed by market and government regulators. The novel outcome of this thesis is that it provides optimal premium strategies based on the behavioural and strategic aspects of the insurers. Therefore, the subjective speculations of management and marketing sectors regarding competitors’ possible risk attitudes and strategies can now be formalised and rigorously analysed in order to produce optimal pricing policies.
Two objective and independent fracture parameters for interface cracks and a paradox
Creators: name: Zhao, Jia-Min
name: Wang, He-Ling
name: Liu, Bin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Due to the oscillatory singular stress field around a crack tip, interface fracture has some peculiar features. This paper is focused on two of them. One can be reflected by a proposed paradox that geometrically similar structures with interface cracks under similar loadings may have different failure behaviors. The other one is that the existing fracture parameters of the oscillatory singular stress field, such as a complex stress intensity factor, exhibit some non-objectivity because their phase angle depend on an arbitrarily chosen length. Two objective and independent fracture parameters are proposed which can fully characterize the stress field near the crack tip. One parameter represents the stress intensity with classical unit of stress intensity factors. It is interesting to find that the loading mode can be characterized by a length as the other parameter, which can properly reflect the phase of the stress oscillation with respect to the distance to the crack tip. This is quite different from other crack tip fields in which the loading mode is usually expressed by a phase angle. The corresponding failure criterion for interface cracks does not include any arbitrarily chosen quantity, and therefore is convenient for comparing and accumulating experimental results, even existing ones.
Comments on "Bayesian Solution Uncertainty Quantification for Differential Equations" by Chkrebtii, Campbell, Calderhead & Girolami
Creators: name: Briol, Francois-Xavier
name: Cockayne, Jon
name: Teymur, Onur
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computation (stat.CO)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We commend the authors for an exciting paper which provides a strong contribution to the emerging field of probabilistic numerics (PN). Below, we discuss aspects of prior modelling which need to be considered thoroughly in future work.