cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
High Performance Depletion/Enhancement-Mode beta-Ga2O3 on Insulator (GOOI) Field-effect Transistors with Record Drain Currents of 600/450 mA/mm
Creators: name: Zhou, Hong
name: Si, Mengwei
name: Alghmadi, Sami
name: Qiu, Gang
name: Yang, Lingming
name: Ye, Peide D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this letter, we report on high performance depletion/enhancement (D/E)-mode beta-Ga2O3 on insulator (GOOI) field-effect transistors (FETs) with record high drain currents (ID) of 600/450 mA/mm, which are nearly one order of magnitude higher than any other reported ID values. The threshold voltage (VT) can be modulated by varying the thickness of the beta-Ga2O3 films and the E-mode GOOI FET can be simply achieved by shrinking the beta-Ga2O3 film thickness. Benefiting from the good interface between beta-Ga2O3 and SiO2 and wide bandgap of beta-Ga2O3, a negligible transfer characteristic hysteresis, high ID on/off ratio of 10^10, and low subthreshold swing of 140 mV/dec for a 300 nm thick SiO2 are observed. E-mode GOOI FET with source to drain spacing of 0.9 um demonstrates a breakdown voltage of 185 V and an average electric field (E) of 2 MV/cm, showing the great promise of GOOI FET for future power devices.
Graphene-based Josephson junction single photon detector
Creators: name: Walsh, Evan D.
name: Efetov, Dmitri K.
name: Lee, Gil-Ho
name: Heuck, Mikkel
name: Crossno, Jesse
name: Ohki, Thomas A.
name: Kim, Philip
name: Englund, Dirk
name: Fong, Kin Chung
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We propose to use graphene-based Josephson junctions (gJjs) to detect single photons in a wide electromagnetic spectrum from visible to radio frequencies. Our approach takes advantage of the exceptionally low electronic heat capacity of monolayer graphene and its constricted thermal conductance to its phonon degrees of freedom. Such a system could provide high sensitivity photon detection required for research areas including quantum information processing and radio-astronomy. As an example, we present our device concepts for gJj single photon detectors in both the microwave and infrared regimes. The dark count rate and intrinsic quantum efficiency are computed based on parameters from a measured gJj, demonstrating feasibility within existing technologies.
description: 11 pages, 6 figures, and 1 table in the main text
A universal property for groupoid C*-algebras. I
Creators: name: Buss, Alcides
name: Holkar, Rohit
name: Meyer, Ralf
Publisher: name: arXiv
Year: 2016
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L55, 22A22

description: We describe representations of groupoid C*-algebras on Hilbert modules over arbitrary C*-algebras by a universal property. For Hilbert space representations, our universal property is equivalent to Renault's Integration-Disintegration Theorem. For a locally compact group, it is related to the automatic continuity of measurable group representations. It implies known descriptions of groupoid C*-algebras as crossed products for étale groupoids and transformation groupoids of group actions on spaces.
description: Final version accepted for publication at Proc. London Math. Soc
The Offset and Host Light Distributions of Superluminous Supernovae: Archival Deep Dive with the Hubble Space Telescope
Creators: name: Hsu, Brian
Publisher: name: Zenodo
Year: 2023
Subjects: Astro 99

description: We present the most extensive Hubble Space Telescope (HST) rest-frame ultraviolet
imaging study of the host galaxies of 48 Type I superluminous supernovae (SLSNe)
spanning 0.0612 ≤ z ≤ 1.998. Taking advantage of the high angular resolution of HST,
we determine the SLSN locations within their host galaxies with precise astrometric matching using ground- and space-based SLSN observations and measure the distribution of SN offsets from their host centers, as well as their relation to the underlying host light distribution. We find that the host-normalized offsets of SLSNe roughly trace an exponential disk profile, with a median ⟨Rphys/R50⟩ = 0.98. In particular, they are more likely to occur either in the outskirts or, in the most extreme cases, entirely out-
side their host galaxies. Furthermore, the fractional flux distribution, with a median

of 0.26, indicates that SLSNe are not as strongly correlated with active star-forming
regions as previous studies suggested. Importantly, we find a bimodal distribution in
fractional flux, where half of the SLSNe at offsets (Rphys/R50) ≤ 0.5 exclusively occur
outside any galaxies. We conclude that SLSNe may not prefer the bright regions of their
hosts, indicating that star formation is not the sole factor determining the locations of
SLSNe.
description: astro 99
Thresholding Bandits with Augmented UCB
Creators: name: Mukherjee, Subhojyoti
name: Naveen, K. P.
name: Sudarsanam, Nandan
name: Ravindran, Balaraman
Publisher: name: arXiv
Year: 2017
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper we propose the Augmented-UCB (AugUCB) algorithm for a fixed-budget version of the thresholding bandit problem (TBP), where the objective is to identify a set of arms whose quality is above a threshold. A key feature of AugUCB is that it uses both mean and variance estimates to eliminate arms that have been sufficiently explored; to the best of our knowledge this is the first algorithm to employ such an approach for the considered TBP. Theoretically, we obtain an upper bound on the loss (probability of mis-classification) incurred by AugUCB. Although UCBEV in literature provides a better guarantee, it is important to emphasize that UCBEV has access to problem complexity (whose computation requires arms' mean and variances), and hence is not realistic in practice; this is in contrast to AugUCB whose implementation does not require any such complexity inputs. We conduct extensive simulation experiments to validate the performance of AugUCB. Through our simulation work, we establish that AugUCB, owing to its utilization of variance estimates, performs significantly better than the state-of-the-art APT, CSAR and other non variance-based algorithms.
description: 7 pages, Accepted at Proceedings of the 26th International Joint Conference on Artificial Intelligence, 2017, 2515-2521
A JWST Library of Galaxy Spectral Energy Distributions
Creators: name: Skarbinski, Maya
Publisher: name: Zenodo
Year: 2023
Subjects: redshift
GOODS-S
photometry
Astro 99

description: We present a library of spectral energy distributions (SEDs) using JWST imaging of galaxies of known spectroscopic redshift in the GOODS-S field. The library consists of 399 galaxies with known spectroscopic redshifts between 0.1 < z < 11.7. The new imaging from JWST results in precise photometry over the wavelength range 0.8 to 5 μm. The galaxies in our sample are faint, with the median flux corresponding to an AB magnitude of 26.6. Past SED libraries include only low-redshift (z < 0.05) and brighter galaxies. Our sample consists primarily of star-forming galaxies. We find that the normalized SEDs in our library follow a consistent trend with evidence of emission lines. Using population synthesis modeling, we study the age-sensitive feature D4000 (the amplitude of the discontinuity at 4000 ̊A), the specific star formation rate, and the Balmer jump of these galaxies. We also examine the potential for z ∼ 1.5 galaxies to be identified as Lyman-break galaxy candidates (z ∼ 7) using
color selections, and find that there is relatively low contamination. This library
will be useful for spectral energy distribution references such as photometric redshift templates, in addition to being an important reference set for faint, high-redshift objects.
description: astro 99
title: SIEM Guidelines for Inclusive Mobility Promotion
title: Supporting in- and outbound student mobility
titleType: Subtitle
Creators: name: European University Foundation
name: Erasmus Student Network
Publisher: name: Erasmus Student Network AISBL
Year: 2022

description: The general aim of the guidelines is to ease current barriers to mobility and to increase the participation of underrepresented student groups in physical credit mobility at European higher education institutions.

The guidelines will allow International Relations Officers (IROs) and Higher Education Institutions (HEIs) to better understand the differences in the student population at local level and the characteristics of the currently underrepresented student groups in international student mobility.

The “Social Inclusion and Engagement in Mobility” (SIEM) project aimed to make the Erasmus+ programme more inclusive and to increase the interaction between international students and local communities.
Towards the solution of the many-electron problem in real materials: equation of state of the hydrogen chain with state-of-the-art many-body methods
Creators: name: Motta, Mario
name: Ceperley, David M.
name: Chan, Garnet Kin-Lic
name: Gomez, John A.
name: Gull, Emanuel
name: Guo, Sheng
name: Jimenez-Hoyos, Carlos
name: Lan, Tran Nguyen
name: Li, Jia
name: Ma, Fengjie
name: Millis, Andrew J.
name: Prokof'ev, Nikolay V.
name: Ray, Ushnish
name: Scuseria, Gustavo E.
name: Sorella, Sandro
name: Stoudenmire, Edwin M.
name: Sun, Qiming
name: Tupitsyn, Igor S.
name: White, Steven R.
name: Zgid, Dominika
name: Zhang, Shiwei
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present numerical results for the equation of state of an infinite chain of hydrogen atoms. A variety of modern many-body methods are employed, with exhaustive cross-checks and validation. Approaches for reaching the continuous space limit and the thermodynamic limit are investigated, proposed, and tested. The detailed comparisons provide a benchmark for assessing the current state of the art in many-body computation, and for the development of new methods. The ground-state energy per atom in the linear chain is accurately determined versus bondlength, with a confidence bound given on all uncertainties.
description: 29 pages, 16 figures -- revised and updated version
Optimistic estimation on probing primordial gravitational waves with CMB B-mode polarization
Creators: name: Huang, Qing-Guo
name: Wang, Sai
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In the measurements of cosmic microwave background polarizations, three frequency channels are necessary for discriminating the primordial B-modes from the polarized dust and the synchrotron emission. We carry out an optimistic estimate on the sensitivity to the detection of primordial gravitational waves using the cosmic microwave background B-modes only, and explore how to reach the thresholds for the tensor-to-scalar ratio $r$ in the theoretically well-motivated inflation models. For example, Lyth bound implies $r \simeq 2\times10^{-3}$, a corrected Lyth bound shows $r \simeq 7\times10^{-4}$, and some typical inflation models gives $r\simeq4\times10^{-5}$. Taking into account the up-to-date constraints on $r$, i.e. $r_{0.05}<0.07$ at $95\%$ confidence, we find that the consistency relation $n_t=-r/8$ in the canonical single-field slow-roll inflation cannot be distinguished from the scale invariance, due to the cosmic variance in the power spectrum of cosmic microwave background B-modes. The cosmic variance places an inevitable limit on the measurements of the tensor spectral index, i.e. $σ_{n_t}\simeq0.01$ for $2\leqslant\ell\leqslant \ell_\text{max}=300$.
description: 9 pages, 2 columns, 12 figures, a revised version accepted by MNRAS
Observational Signatures Of Interstellar Objects And Their Implications For Astronomy
Creators: name: Siraj, Amir
Publisher: name: Zenodo
Year: 2020
Subjects: Observational astronomy
Interstellar objects
Astro 99

description: 1I/‘Oumuamua (Meech et al. 2017) and 2I/Borisov (Guzik et al. 2020) are the first two confirmed interstellar objects detected in the solar system, and CNEOS 2014-01-08 is tentatively the first interstellar meteor discovered larger than dust (Siraj & Loeb 2019c)1. Here, I present novel observational methods for the discovery and characterization of interstellar objects, including reflected sunlight (Siraj & Loeb 2019i,b), streaks in the Earth’s atmosphere (Siraj & Loeb 2019g), optical flashes on the Moon (Siraj & Loeb 2019a), radio flares from neutron stars (Siraj & Loeb 2019h), stellar occultations (Siraj & Loeb 2020a), and unusual orbits of trapped objects (Siraj & Loeb 2019f). I then theorize two new populations of interstellar objects, those originating from halo stars and those originating from supernovae, exploring their unique detection signatures as well as their implications for understanding planet formation in the early Universe and supernova ejecta, respectively (Siraj & Loeb 2019e, 2020b). Finally, I evaluate the possibility that interstellar objects could have exported life from the Earth to other star systems (Siraj & Loeb 2019d, 2020c).
description: Astro 99
Distinguishing A Higgs-Like Dilaton Scenario With A Complete Bosonic Effective Field Theory Basis
Creators: name: Hernandez-Leon, P.
name: Merlo, L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A Higgs-like dilaton owns couplings that differ from those of the Standard Model Higgs and of a generic Composite Higgs. The complete bosonic basis for a Higgs-like dilaton is presented at the first subleading order. A comparison with the Standard Model, the Standard Model Effective Field Theory and the generic Lagrangian for the minimal $SO(5)/SO(4)$ Composite Higgs model is performed. Observables that can disentangle the different hypotheses are identified.
description: 19 pages, 2 tables. Appendix A added. Version published in PRD
Using Protostellar Outflow Chemistry to Probe Extraterrestrial Ice Abundances: A study in the chemical morphology of L1551 IRS5
Creators: name: Weisenberg, Jamie A.
Publisher: name: Zenodo
Year: 2020
Subjects: Protostars
Ice formation
L1551 IRS5
Astro 99

description: Understanding the chemistry that occurs during solar system formation can give insight to how life on earth developed. Most of this chemistry develops on the icy mantles of interstellar grains. To study it we can either observe the species directly in other star systems (in the gas or ice phase) or use models to simulate the process. To detect molecules in space, we can observe emission spectra when a molecule emits a photon or absorption spectra as a molecule absorbs a photon. While the most complex chemistry in space occurs on icy dust grains, it is difficult to detect molecules in the ice phase due to observational limitations. Specifically, the absorption features of ice chemistry are harder to detect than gas phase spectra. While we see complex molecules in the icy interstellar medium and comets, the most complex molecule we can confidently identify in the ice phase using vibrational spectroscopy is methanol (CH3OH). Thus to observe more complex molecules than methanol, we look to find alternative methods of constraining interstellar ice abundances. We present one such alternative approach, using protostellar outflows as a proxy for ice chemistry. These outflows can sputter and sublimate ice into the gas phase without inducing thermal chemical changes. We can thus observe this gas as a measurement of the material that has left the solid phase. Recent studies suggest that L1551 IRS5 shows evidence of chemically rich outflows. Here we use an interferometric survey at radio wavelengths that spans 50 GHz of bandwidth from around 290-365 GHz to examine the chemical morphology of the outflow regions. Specifically, we analyze the spectra of L1551 IRS5 to determine molecular abundances throughout the outflow of the protostar, and image the emission locations to compare the chemistry and morphology of different molecules in the region. We then compare abundances of different regions to other protostellar systems and comets. We compare these outflows to the chemical complexity in comets to test the validity of using shocks to probe the ice cloud of L1551 IRS5. We find a rich chemical profile of many species in the outflow of L1551 IRS5 consistent with previous structural studies of the region. Our analysis shows significant variation in chemical richness and column densities along the outflow as a function of radial distance from the center protostar. Additionally, six of the nine most abundant species present in the outflow are also present in comet 67P/C-G. We conclude that this similarity may suggest that by probing the outflow in L1551 IRS5, we are indeed able to proxy the ice chemistry of the surrounding molecular cloud to better understand the overall chemistry of stellar evolution.
description: Astro 99
Fibre Inflation and Reheating
Creators: name: Cabella, Paolo
name: Di Marco, Alessandro
name: Pradisi, Gianfranco
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present constraints on the reheating era within the string Fibre Inflation scenario, in terms of the effective equation-of-state parameter of the reheating fluid, $w_{reh}$. The results of the analysis, completely independent on the details of the inflaton physics around the vacuum, illustrate the behavior of the number of $e$-foldings during the reheating stage, $N_{reh}$, and of the final reheating temperature, $T_{reh}$, as functions of the scalar spectral index, $n_s$. We analyze our results with respect to the current bounds given by the PLANCK mission data and to upcoming cosmological experiments. We find that large values of the equation-of-state parameter ($w_{reh}>1/3$) are particularly favored as the scalar spectral index is of the order of $n_s\sim 0.9680$, with a $σ_{n_s}\sim 0.002$ error. Moreover, we compare the behavior of the general reheating functions $N_{reh}$ and $T_{reh}$ in the Fibre Inflation scenario with that extracted by the class of the $α$-attractor models with $α=2$. We find that the corresponding reheating curves are very similar in the two cases.
description: Accepted to PRD, 8 pages, 8 figures, references updated, some typos corrected
A Search For Young Ultra-Short-Period Planets with TESS
Creators: name: Wirth, Christopher Paul
Publisher: name: Zenodo
Year: 2023
Subjects: planet formation
young stars
USP planets

description: Ultra-short-period (USP) planets, those with an orbital period less than a day, are a
population of rare and extreme worlds that provide an opportunity to study the formation
and evolution of small planets in ways that are more difficult for their longer period
counterparts. Many of the significant changes a planet experiences occur on timescales of
< 100 Myr, so studying planets across these ages is essential to uncovering mechanisms
that shape planetary systems. However, active young stars can introduce large-amplitude
photometric and spectroscopic variations, making detection and characterization difficult.
Luckily, the very short transits of USP planets are separable even from the stellar signal
of many rapidly rotating young stars, leading to more complete transit detection of
young planets at the shortest periods. I present the development of a specialized pipeline
for identification of candidate young transiting planets using TESS 2-minute data, which
includes detrending designed to preserve transits in the face of rapid stellar rotation. I
tested the pipeline on a set of injected transits, and found it to recover 66% of planets
between 1 − 2R⊕ around stars smaller than the Sun. I applied the pipeline to a sample
of 6600 young stars from the literature, and identified 51 planet candidates, including a
young “twin” of 55 Cnc e and a surprise single-transit candidate with an orbital period
likely longer than a month. This sample of candidates can be followed up to constrain
the occurrence rate of young USP planets and explore the mechanisms shaping young
systems, and this pipeline can be applied to much broader samples as TESS continues
to monitor the whole sky with its new 200-second full frame image cadence.
description: Astro 99
The Role of Parental Monitoring on Sensation-Seeking and Impulse Control Development Before and After Leaving the Parental Home
Creators: name: Whang, Priscilla H.
name: Atherton, Olivia E.
name: Schwaba, Ted
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Child Psychology
subject: Social and Behavioral Sciences
subject: Personality and Social Contexts
subject: Psychology
subject: FOS: Psychology
subject: Developmental Psychology
subject: Social Psychology
subject: impulse control
subject: parental monitoring
subject: self-regulation
subject: sensation-seeking
subject: sex differences
subject: leaving the parental home
subject: personality development
subject: adolescence

description: Dual-systems models consider self-regulation to be an (im)balance of sensation-seeking and impulse control tendencies, which show divergent developmental trajectories during the adolescent and young adult years. On average, youth increasingly pursue new and exciting sensations, while their impulse control lags, creating a window of self-regulatory vulnerability. Yet, we know little about how major developmental tasks (e.g., leaving the parental home) and contextual factors (e.g., parental monitoring) shape sensation-seeking and impulse control trajectories. The present pre-registered study uses multi-method longitudinal data from the NLSY79 CYA cohort (N = 11,545), who have 11 measurement occasions and range in age from 10 to 25. Using multilevel modeling, we will test: (1) whether developmental trajectories of sensation-seeking and impulse control differ before and after leaving home, (2) how parental monitoring shapes sensation-seeking and impulse control development in relation to leaving home, and (3) whether these effects differ between boys and girls. The findings will have important theoretical and practical implications for social, personality, and developmental psychology.
Accretion onto a noncommutative geometry inspired black hole
Creators: name: Kumar, Rahul
name: Ghosh, Sushant G.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The spherically symmetric accretion onto a noncommutative (NC) inspired Schwarzschild black hole is treated for a polytropic fluid. The critical accretion rate $\dot{M}$, sonic speed $a_s$ and other flow parameters are generalised for the NC inspired black hole and compared with the results obtained for the standard Schwarzschild black holes. We also derive explicit expressions for gas compression ratios and temperature profiles below the accretion radius and at the event horizon. This analysis is a generalisation of Michel's solution to the NC geometry. Owing to the NC corrected black hole, the accretion flow parameters have also been modified. It turns out that $ \dot{M} \approx {M^2}$ is still achievable but $r_s$ seems to be substantially decreased due to NC effects, that in turn does affect the accretion process.
description: Published in EPJC
A load surrogate model based on rotor-equivalent inflow quantities
Creators: name: Guillore, Adrien
name: Campagnolo, Filippo
name: Bottasso, Carlo L.
Publisher: name: Zenodo
Year: 2023
Subjects: Wind farm control, load surrogate model, inflow quantities

description: Presentation by Adrien Guillore, Technical University of Munich, at the Wind Energy Science Conference, Glasgow, 24 May 2023. https://www.wesc2023.eu/ In recent years, wind farm control has demonstrated its potential for increasing power capture, although the importance of including the effects of loads for lifetime management, maintenance optimization and health prediction is becoming more and more pressing. Unfortunately, predicting turbine loads requires computationally expensive aero-servo-elastic simulations, which are impractical or even not feasible at all for real-time control or in offline set-point optimizations; similar challenges are present in farm layout design, uncertainty quantification and other repetitive tasks. These challenges can be tackled by the development of load surrogate models, whose goal is to quickly generate load estimates based on given inputs, typically by interpolating within pre-computed or directly measured datasets, which can be done in various ways. A question however remains: what is the best choice of inputs? This work develops a load surrogate model whose inputs are local rotor-equivalent inflow quantities (REIQs). The underlying hypothesis is that -for each turbine type with its control system- loads depend only on the inflow at the rotor disk. Therefore, if the inflow is described with sufficient accuracy, an accurate enough map between inflow and loads can be established. By design, the load surrogate is turbine-model specific, but location agnostic. As such, the surrogate can be applied to any turbine regardless of its position in the farm or other effects such as ambient atmospheric conditions, wake interactions, local terrain orography, etc., as long as these are captured by the description of the rotor inflow given by the REIQs. The present formulation uses as inputs the rotor-equivalent wind speed, turbulence intensity, vertical and horizontal shears, and yaw misalignment. The map between these quantities and DELs (damage equivalent loads) on turbine components is approximated using a single hidden layer neural network. The methodology was first tested based on turbulent aero-servo-elastic simulations of the IEA Task 37 reference turbine using the FAST.Farm code. A large set of cases was obtained by varying the ambient wind speed, turbulence intensity, wind direction, vertical shear, turbine spacing and yaw misalignments. The same method was also tested using an experimental dataset from wind tunnel measurements using the TUM G1 scaled turbine. In both the simulation and experimental cases, a subset of the data was used to train the load surrogate, which was then validated using the remaining cases. Results indicate that the approach performs well, even when considering complex inflow changes caused by wake interactions.
SMART SHAHARLARDA BLOKCHEYN VA RAQAMLI IDENTIFIKATSIYA: TOSHKENT UCHUN ISTIQBOLLAR
Creators: name: Said-jalolov, Saidazimxon
Publisher: name: Zenodo
Year: 2025

description: Ushbu maqolada aqlli shaharlar uchun blokcheyn texnologiyasining raqamli identifikatsiyada qo‘llanilishi, xususan, Toshkentda uni joriy etish istiqbollari tahlil qilinadi. Raqamli identifikatsiyaning asosiy tamoyillari, mavjud muammolari va markazlashmagan yechimlarning afzalliklari ko‘rib chiqiladi. Ayniqsa, blokcheyn texnologiyasining O‘z-o‘zini boshqaruvchi identifikatsiya (SSI) tizimini yaratishdagi imkoniyatlari tahlil qilinadi, bu esa fuqarolarga shaxsiy ma'lumotlarini to‘liq nazorat qilish imkonini beradi. Maqolada turli davlatlarda muvaffaqiyatli amalga oshirilgan misollar keltirilgan hamda blokcheynni Toshkent infratuzilmasiga integratsiya qilish bo‘yicha muammolar va xavf-xatarlar muhokama qilinadi. Shahar boshqaruvida ushbu texnologiyani samarali qo‘llash uchun zarur bo‘lgan asosiy jihatlar aniqlanadi.
Measuring optical properties of dielectrics at ambient and cryogenic temperatures for use in CMB telescopes
Creators: name: Meiners, Grant
Publisher: name: Zenodo
Year: 2023
Subjects: cosmic microwave background radiation
telescope optics
Fabry-Perot
Astro 99

description: The cosmic microwave background radiation (CMB) is our window into the earliest moments of the universe. By studying its anisotropies and polarization, we can learn more about the structure and composition of our universe, which will in turn answer fundamental questions regarding its creation. To observe the CMB, cryogenically-cooled telescopes are used. Cryogenic temperatures cause materials to change properties, including optical properties such as refractive index and loss. In order to make proper observations, the properties of telescope optics must, therefore, be understood at cryogenic temperatures. In this thesis
project, we used the Fabry-Perot open resonator technique and designed a vacuum cryostat to measure optical properties of materials commonly used in CMB telescope optics. Our results are promising, but further theoretical and physical improvements to the measurement process will be necessary to provide greater accuracy.
description: astro 99
Probing the gauge symmetry breaking of the early universe in 3-3-1 models and beyond by gravitational waves
Creators: name: Huang, Fa Peng
name: Zhang, Xinmin
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Taking the 3-3-1 models (with $SU(3)_c \otimes SU(3)_L \otimes U(1)_Y$ gauge group) as examples, we study that a class of new physics models with extended gauge group could undergo one or several first-order phase transitions associated with the spontaneously symmetry breaking processes during the evolution of the universe, which can produce detectable phase transition gravitational wave (GW) signals at future GW experiments, such as LISA, BBO, DECIGO, SKA and aLIGO. These GW signals can provide new sources of GWs with different peak frequencies, and can be used to probe the evolution history of the universe.
description: Published version for Physics Letters B
Exploratory and Confirmatory Factor Analyses of Religiosity. A Four-Factor Conceptual Model
Creators: name: Lemos, Carlos Miguel
name: Gore, Ross
name: Shults, F. LeRon
Publisher: name: arXiv
Year: 2017
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: We describe an exploratory and confirmatory factor analysis of the International Social Survey Programme Religion Cumulation (1991-1998-2008) data set, to identify the factors of individual religiosity and their interrelations in quantitative terms. The exploratory factor analysis was performed using data from the first two waves (1991 and 1998), and led to the identification of four strongly correlated and reliable factors which we labeled Religious formation, Supernatural beliefs, Belief in God, and Religious practice. The confirmatory factor analysis was run using data from 2008, and led to the confirmation of this four-factor structure with very good fit measures. We also ran a set of structural equation models in an attempt to determine the causality links between these four factors. It was found that for the models which provide the best fit Belief in God does not cause Supernatural beliefs, Religious practice can cause Belief in God and that there are multiple paths leading to Belief in God, most of which include Religious formation as a source. The exploratory factor analysis also led to the identification of other factors related to traditional values, confidence in institutions and influence of religious leaders on politics, but these were found to have lower reliability or insufficient number of items to meet the acceptance criteria, and thus were not included in the confirmatory factor analysis and the investigation of causal links. The results obtained in this work have important material implications for the conceptualization of "religiosity," and important methodological implications for the scientific study of religion.
Spatial Decompositions for Large Scale SVMs
Creators: name: Thomann, Philipp
name: Blaschzyk, Ingrid
name: Meister, Mona
name: Steinwart, Ingo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Although support vector machines (SVMs) are theoretically well understood, their underlying optimization problem becomes very expensive, if, for example, hundreds of thousands of samples and a non-linear kernel are considered. Several approaches have been proposed in the past to address this serious limitation. In this work we investigate a decomposition strategy that learns on small, spatially defined data chunks. Our contributions are two fold: On the theoretical side we establish an oracle inequality for the overall learning method using the hinge loss, and show that the resulting rates match those known for SVMs solving the complete optimization problem with Gaussian kernels. On the practical side we compare our approach to learning SVMs on small, randomly chosen chunks. Here it turns out that for comparable training times our approach is significantly faster during testing and also reduces the test error in most cases significantly. Furthermore, we show that our approach easily scales up to 10 million training samples: including hyper-parameter selection using cross validation, the entire training only takes a few hours on a single machine. Finally, we report an experiment on 32 million training samples. All experiments used liquidSVM (Steinwart and Thomann, 2017).
A quartet of fermionic expressions for $M(k,2k\pm1)$ Virasoro characters via half-lattice paths
Creators: name: Blondeau-Fournier, Olivier
name: Mathieu, Pierre
name: Welsh, Trevor A
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 05E10 (Primary) 17B68, 82B23 (Secondary)

description: We derive new fermionic expressions for the characters of the Virasoro minimal models $M(k,2k\pm1)$ by analysing the recently introduced half-lattice paths. These fermionic expressions display a quasiparticle formulation characteristic of the $ϕ_{2,1}$ and $ϕ_{1,5}$ integrable perturbations. We find that they arise by imposing a simple restriction on the RSOS quasiparticle states of the unitary models $M(p,p+1)$. In fact, four fermionic expressions are obtained for each generating function of half-lattice paths of finite length $L$, and these lead to four distinct expressions for most characters $χ^{k,2k\pm1}_{r,s}$. These are direct analogues of Melzer's expressions for $M(p,p+1)$, and their proof entails revisiting, reworking and refining a proof of Melzer's identities which used combinatorial transforms on lattice paths. We also derive a bosonic version of the generating functions of length $L$ half-lattice paths, this expression being notable in that it involves $q$-trinomial coefficients. Taking the $L\to\infty$ limit shows that the generating functions for infinite length half-lattice paths are indeed the Virasoro characters $χ^{k,2k\pm1}_{r,s}$.
description: 29 pages. v2: minor improvements, references added
title: For more inclusive & engaging Erasmus+ mobilities
title: Technical recommendations to adapt the Erasmus+ documents involved in Erasmus+ student mobilities
titleType: Subtitle
Creators: name: Erasmus Student Network AISBL
name: European University Foundation
Publisher: name: Erasmus Student Network AISBL
Year: 2022

description: The recommendations propose a set of concrete changes to the documents involved in the organisation of Erasmus+ mobilities. They target the European Commission, Erasmus+ National Agencies, Higher Education Institutions and other policymakers and stakeholders interested in Erasmus+ and mobility programmes.

The “Social Inclusion and Engagement in Mobility” (SIEM) project aimed to make the Erasmus+ programme more inclusive and to increase the interaction between international students and local communities.
Certificates for triangular equivalence and rank profiles
Creators: name: Dumas, Jean-Guillaume
name: Lucas, David
name: Pernet, Clément
Publisher: name: arXiv
Year: 2017
Subjects: subject: Symbolic Computation (cs.SC)
subject: FOS: Computer and information sciences

description: In this paper, we give novel certificates for triangular equivalence and rank profiles. These certificates enable to verify the row or column rank profiles or the whole rank profile matrix faster than recomputing them, with a negligible overall overhead. We first provide quadratic time and space non-interactive certificates saving the logarithmic factors of previously known ones. Then we propose interactive certificates for the same problems whose Monte Carlo verification complexity requires a small constant number of matrix-vector multiplications, a linear space, and a linear number of extra field operations. As an application we also give an interactive protocol, certifying the determinant of dense matrices, faster than the best previously known one.
Assessing LSST's ability to hunt LIGO black holes with microlensing
Creators: name: Abrams, Natasha S.
Publisher: name: Zenodo
Year: 2020
Subjects: Gravitational microlensing
Large Synoptic Survey Telescope
Black holes
Astro 98

description: Gravitational microlensing is a powerful tool to study invisible objects, such as black holes, in the Milky Way. By monitoring highly populated areas like the Galactic bulge region, one can observe microlensing events due to brown dwarfs, main-sequence stars, white dwarfs, neutron stars, and black holes. We model the microlensing event rates with source stars in the Galactic bulge region using standard spatial and velocity distributions of stars in the Galactic bulge and disk. We nd that if black holes have an extended Salpeter-like mass function (as indicated by the recent LIGO binary-black hole gravitational wave events) and a similar velocity and spatial structure to stars, the black hole population leads to a distinct increase in the microlensing event rate with Einstein crossing time on the order of 100 days. By looking toward the Galactic bulge region and observing on the order of 108 stars, we could potentially observe this excess of microlensing events. The Large Synoptic Survey Telescope (LSST) holds the potential to make these observations. We evaluate the ecacy of potential LSST cadences for both triggering and characterizing the light curves of black hole microlensing. For three candidate LSST observing cadences, we nd that a deterministic scanning of the sky (the altLike cadence) detects and triggers a higher percentage of microlensing events than the greedy-optimized cadence weighted toward the Galactic bulge region, and both do better than LSST's baseline cadence, though there is little dierence at high Einstein crossing times.
description: Astro 98
On the Clustering of z ∼ 7 Dropout Galaxies Detected by JWST in the GOODS-S Field
Creators: name: Sharpe, Katie
Publisher: name: Zenodo
Year: 2023
Subjects: redshift
galaxy distribution
JADES GOOD-S
Astro 99

description: The high redshift universe offers a critical look into the evolutionary past and our cosmic origins,
and JWST provides astronomers with an unprecendented and powerful facility for its study. In this
work, we use z ∼ 7 (∼ 0.9 μm) dropout galaxies from the JADES GOODS-S survey to probe galaxy
clustering during the epoch of reionization. We find that the angular correlation function θΔω(θ) is
approximately flat; the shape of θΔ(θ) excitingly hints towards a potential distinction between the
one-halo and two-halo clustering overdensities, which have been observed in the literature at lower
redshifts. We calculate the flat-line amplitude of clustering of θΔω(θ) to be 1.23 ± 0.11 × 10−5
. We extend the flat-sky angular correlation function to three dimensions using the Limber approx-
imation to find the parameters r0 and γ in the two point correlation function, ξ(r) = (r/r0)−γ.
We note that the slope of the power law γ ≈ 2 and solve for the value of the correlation length r0 = 3.14+0.14 −0.15 h −1*. We compare our results to an equivalent redshift cosmological simulation from the AbacusSummit suite, finding that the simulation is consistent with the observed ampli-
tude of clustering with minimum dark matter halo masses Mhalo ≈ 1010 M⊙.
description: astro 99
Solar $γ$-rays as a Complementary Probe of Dark Matter
Creators: name: Arina, Chiara
name: Backović, Mihailo
name: Heisig, Jan
name: Lucente, Michele
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that observations of solar $γ$-rays offer a novel probe of dark matter in scenarios where interactions with the visible sector proceed via a long-lived mediator. As a proof of principle, we demonstrate that there exists a class of models which yield solar $γ$-ray fluxes observable with the next generation of $γ$-ray telescopes, while being allowed by a variety of current experimental constraints. The parameter space allowed by big bang nucleosynthesis and beam dump experiments naturally leads to mediator lifetimes sufficient to produce observable solar $γ$-ray signals. The model allows for solar $γ$-ray fluxes up to orders of magnitude larger compared to dwarf spheroidal galaxies, without reaching equilibrium between dark matter annihilation and capture rate. Our results suggest that solar $γ$-ray observations are complementary, and in some cases superior, to existing and future dark matter detection efforts.
description: 15 pages + references, 7 figures, v3: Fermi-LAT and HERD sensitivity corrected, minor presentational improvements, matches journal version
Perturbations and projections of Kalman-Bucy semigroups
Creators: name: Bishop, Adrian N.
name: Del Moral, Pierre
name: Pathiraja, Sahani D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We analyse various perturbations and projections of Kalman-Bucy semigroups and Riccati equations. For example, covariance inflation-type perturbations and localisation methods (projections) are common in the ensemble Kalman filtering literature. In the limit of these ensemble methods, the regularised sample covariance tends toward a solution of a perturbed/projected Riccati equation. With this motivation, results are given characterising the error between the nominal and regularised Riccati flows and Kalman-Bucy filtering distributions. New projection-type models are also discussed; e.g. Bose-Mesner projections. These regularisation models are also of interest on their own, and in, e.g., differential games, control of stochastic/jump processes, and robust control.
197 Candidates and 102 New Validated Planets in C0-C10 of K2
Creators: name: Mayo, Andrew W.
Publisher: name: Zenodo
Year: 2017
Subjects: Astro 99

description: Since 2014, the K2 mission has observed large portions of the ecliptic plane in search of transiting planets, and thus far discovered over 500 planet candidates in the first 10 campaigns. With observations planned up to at least campaign 16, many more planet candidates will continue to be discovered. We present here our identification of 197 planet candidates suitable for validation from campaigns 0-10 of the K2 mission. We subject these planets to a validation process in order to calculate the false positive probability (FPP), and find that 102 are validated (FPP < 0.001), 61 remain candidates (0.001 < FPP), and 34 are of an unknown disposition (we were unable to or chose not to report the false positive probability). Of the 102 newly validated planets, 32 have already been validated elsewhere, 37 have merely been identified as candidates elsewhere, and 33 have never been identified before. We describe the process of data reduction, candidate identification, and validation. We also explore the demographics of the newly validated planets. This research, in addition to dramatically increasing the population of validated K2 planets, will also provide new targets for follow-up observations, as well as serve as a framework for validating candidates from upcoming K2 campaigns and candidates identified through the Transiting Exoplanet Survey Satellite (TESS), expected to launch in early to mid 2018.
description: Astro 99
Carbon Chain Molecules Toward Embedded Low-Mass Protostars
Creators: name: Law, Charles
Publisher: name: Zenodo
Year: 2017
Subjects: Carbon chain molecules
Astro 99

description: Carbon chain molecules may be an important reservoir of reactive, volatile organics during planet formation. Carbon chains have been observed toward several low-mass young stellar objects (YSOs), but their typical abundances and chemical relationships in such sources are largely unconstrained. We present observations toward 16 deeply embedded (Class 0/I) low-mass protostars using the IRAM 30 m telescope. Carbon chains are found to be common at this stage of protostellar evolution. We detect CCS, CCCS, HC3N, HC5N, C3H, and C4H toward 94%, 44%, 81%, 38%, 88%, and 88% of sources, respectively. Median column densities derived using survival analysis range between 9.6×1010cm−2 (CCCS) and 1.4×1013cm−2 (C4H) and fractional abundances with respect to hydrogen range between 1.6×10−13 (CCCS) and 4.5×10−11 (C4H). Column densities for each molecule vary by one to two orders of magnitude across the sample. Median abundances in our low-mass YSOs are found to be underabundant compared to cold cloud cores, warm carbon chain chemistry (WCCC) sources, and warm-up models. With the exception of CCS and HC3N, we do not find significant correlations between molecules in different carbon chain families, indicative of the presence of several independent carbon chain formation chemistries. This correlation also implies that the production chemistry of sulfur-bearing carbon chains and cyanpolyynes, which are closely related in the cold cloud phase, continue to be linked in low-mass star formation.
description: Astro 99
On the E2-term of the bo-Adams spectral sequence
Creators: name: Beaudry, Agnes
name: Behrens, Mark
name: Bhattacharya, Prasit
name: Culver, Dominic
name: Xu, Zhouli
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: The E_1-term of the (2-local) bo-based Adams spectral sequence for the sphere spectrum decomposes into a direct sum of a v_1-periodic part, and a v_1-torsion part. Lellmann and Mahowald completely computed the d_1-differential on the v_1-periodic part, and the corresponding contribution to the E_2-term. The v_1-torsion part is harder to handle, but with the aid of a computer it was computed through the 20-stem by Davis. Such computer computations are limited by the exponential growth of v_1-torsion in the E_1-term. In this paper, we introduce a new method for computing the contribution of the v_1-torsion part to the E_2-term, whose input is the cohomology of the Steenrod algebra. We demonstrate the efficacy of our technique by computing the bo-Adams spectral sequence beyond the 40-stem.
description: 64 pages, 16 figures, few minor typos fixed, accepted to J. Topology