cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Additional file 1 of Dynamics of plasma biomarkers in Down syndrome: the relative levels of Aβ42 decrease with age, whereas NT1 tau and NfL increase
Creators: name: Mengel, David
name: Liu, Wen
name: Glynn, Robert J.
name: Selkoe, Dennis J.
name: Strydom, Andre
name: Lai, Florence
name: Rosas, H. Diana
name: Torres, Amy
name: Patsiogiannis, Vasiliki
name: Skotko, Brian
name: Walsh, Dominic M.
Publisher: name: figshare
Year: 2020
Subjects: Biochemistry
Medicine
Neuroscience
Developmental Biology
Cancer
Mental Health

description: Additional file 1:Table S1. Demographics of the PRECISION study cohort. Table S2. Individual results of plasma Aβ42, NT1 tau, and NfL in Down syndrome and controls. Table S3. Change-point regression for association of age with plasma biomarker levels.
Echo State Network based Symbol Detection in Chaotic Baseband Wireless Communication
Creators: name: Yin, Hui-Ping
name: Bai, Chao
name: Ren, Hai-Peng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In some Internet of Things (IoT) applications, multi-path propagation is a main constraint of communication channel. Recently, the chaotic baseband wireless communication system (CBWCS) is promising to eliminate the inter-symbol interference (ISI) caused by multipath propagation. However, the current technique is only capable of removing the partial effect of ISI, due to only past decoded bits are available for the suboptimal decoding threshold calculation. However, the future transmitting bits also contribute to the threshold. The unavailable future information bits needed by the optimal decoding threshold are an obstacle to further improve the bit error rate (BER) performance. Different from the previous method using echo state network (ESN) to predict one future information bit, the proposed method in this paper predicts the optimal threshold directly using ESN. The proposed ESN-based threshold prediction method simplifies the symbol decoding operation by removing the threshold calculation from the transmitting symbols and channel information, which achieves better BER performance as compared to the previous method. The reason for this superior result lies in two folds, first, the proposed ESN is capable of using more future symbols information conveyed by the ESN input to get more accurate threshold; second, the proposed method here does not need to estimate the channel information using Least Square method, which avoids the extra error caused by inaccurate channel information estimation. By this way, the calculation complexity is decreased as compared to the previous method. Simulation results and experiment based on a wireless open-access research platform under a practical wireless channel, show the effectiveness and superiority of the proposed method.
description: 12 pages, 15 figures
The index of compact simple Lie groups
Creators: name: Berndt, Jurgen
name: Olmos, Carlos
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 53C35, Secondary 53C40

description: Let M be an irreducible Riemannian symmetric space. The index i(M) of M is the minimal codimension of a (non-trivial) totally geodesic submanifold of M. The purpose of this note is to determine the index i(M) for all irreducible Riemannian symmetric spaces M of type (II) and (IV).
description: 5 pages
Energy Conditions in $f(P)$ Gravity
Creators: name: Bhattacharjee, Snehasish
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: $f(P)$ gravity is a novel extension of ECG in which the Ricci scalar in the action is replaced by a function of the curvature invariant $P$ which represents the contractions of the Riemann tensor at the cubic order \cite{p}. The present work is concentrated on bounding some $f(P)$ gravity models using the concept of energy conditions where the functional forms of $f(P)$ are represented as \textbf{a)} $f(P) = α\sqrt{P}$, and \textbf{b)} $f(P) = α\exp (P)$, where $α$ is the sole model parameter. Energy conditions are interesting linear relationships between pressure and density and have been extensively employed to derive interesting results in Einstein's gravity, and are also an excellent tool to impose constraints on any cosmological model. To place the bounds, we ensured that the energy density must remain positive, the pressure must remain negative, and the EoS parameter must attain a value close to $-1$ to make sure that the bounds respect the accelerated expansion of the Universe and are also in harmony with the latest observational data. We report that for both the models, suitable parameter spaces exist which satisfy the aforementioned conditions and therefore posit the $f(P)$ theory of gravity to be a promising modified theory of gravitation.
Additional file 2 of Dynamics of plasma biomarkers in Down syndrome: the relative levels of Aβ42 decrease with age, whereas NT1 tau and NfL increase
Creators: name: Mengel, David
name: Liu, Wen
name: Glynn, Robert J.
name: Selkoe, Dennis J.
name: Strydom, Andre
name: Lai, Florence
name: Rosas, H. Diana
name: Torres, Amy
name: Patsiogiannis, Vasiliki
name: Skotko, Brian
name: Walsh, Dominic M.
Publisher: name: figshare
Year: 2020
Subjects: Biochemistry
Medicine
Neuroscience
Developmental Biology
Cancer
Mental Health

description: Additional file 2:Figure S1. Plasma Aβ42 levels are stable when measured in the same subjects over a 5 day period. Figure S2. Plasma NT1 tau levels are stable in the same subjects over a 5 day period. Figure S3. Plasma NfL levels are stable in the same subjects over a 5 day period. Figure S4. Prediction of biomarker changes by age using piecewise linear regression.
DataLens: Scalable Privacy Preserving Training via Gradient Compression and Aggregation
Creators: name: Wang, Boxin
name: Wu, Fan
name: Long, Yunhui
name: Rimanic, Luka
name: Zhang, Ce
name: Li, Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Recent success of deep neural networks (DNNs) hinges on the availability of large-scale dataset; however, training on such dataset often poses privacy risks for sensitive training information. In this paper, we aim to explore the power of generative models and gradient sparsity, and propose a scalable privacy-preserving generative model DATALENS. Comparing with the standard PATE privacy-preserving framework which allows teachers to vote on one-dimensional predictions, voting on the high dimensional gradient vectors is challenging in terms of privacy preservation. As dimension reduction techniques are required, we need to navigate a delicate tradeoff space between (1) the improvement of privacy preservation and (2) the slowdown of SGD convergence. To tackle this, we take advantage of communication efficient learning and propose a novel noise compression and aggregation approach TOPAGG by combining top-k compression for dimension reduction with a corresponding noise injection mechanism. We theoretically prove that the DATALENS framework guarantees differential privacy for its generated data, and provide analysis on its convergence. To demonstrate the practical usage of DATALENS, we conduct extensive experiments on diverse datasets including MNIST, Fashion-MNIST, and high dimensional CelebA, and we show that, DATALENS significantly outperforms other baseline DP generative models. In addition, we adapt the proposed TOPAGG approach, which is one of the key building blocks in DATALENS, to DP SGD training, and show that it is able to achieve higher utility than the state-of-the-art DP SGD approach in most cases. Our code is publicly available at https://github.com/AI-secure/DataLens.
description: Accepted to ACM CCS 2021. 23 pages, 4 figures, 12 tables
BOSHLANG'ICH TA'LIMDA INFORMATIKA VA AXBOROT TEXNOLOGIYALARI FANI: O'QITISH MAQSADI VA VAZIFALARI
Creators: name: Radjabova, Gulandom
Publisher: name: Zenodo
Year: 2024

description: XXI- asr -  axborot-kommunikatsion texnologiyalari asridir. Zamonaviy jamiyatda bolalar boshlang’ich maktab yoshdanoq axborot-kommunikatsion texnologiyalari yordamida ma’lum kundalik vazifalarni hal qilishning qulay vositasi sifatida foydalanishni boshlaydilar. Shuning uchun bolаlаrgа   boshlаng’ich mаktаb   yoshidаnoq   qаlаmni   to’g’ri ushlаb   yozishni, yozishdа  pаrtаga   to’g’ri  o’tirish  qoidаlаrini  o’rgаtgаnimizdek,  kompyuter   vа   turli  аxborot-kommunikatsiyа   texnologiyаlаri   bilаn  to’g’ri   munosаbаtdа  bo’lishni  o’rgаtishimiz lozim. Mаqolаdа   boshlаng’ich   tа’limdа   informаtikа   vа аxborot texnologiyаlаri fаnini  o’qitishning mаqsаd  vа  vazifаlаri  bаyon  etilgаn.
Evidence for a Dusty Dark Dwarf Galaxy in the Quadruple Lens MG0414+0534
Creators: name: Inoue, Kaiki Taro
name: Matsushita, Satoki
name: Minezaki, Takeo
name: Chiba, Masashi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report the $4 \, σ$ detection of a faint object with a flux of ~ 0.3 mJy, in the vicinity of the quadruply lensed QSO MG0414+0534 using the Atacama Large Millimeter/submillimeter array (ALMA) Band 7. The object is most probably a dusty dark dwarf galaxy, which has not been detected in either the optical, near-infrared (NIR) or radio (cm) bands. An anomaly in the flux ratio of the lensed images observed in Band 7 and the mid-infrared (MIR) band and the reddening of the QSO light color can be simultaneously explained if we consider the object as a lensing substructure with an ellipticity ~ 0.7 at a redshift of $0.5 \lesssim z \lesssim 1$. Using the best-fit lens models with three lenses, we find that the dark matter plus baryon mass associated with the object is $\sim 10^9\, M_{\odot}$, the dust mass is $\sim 10^7\,M_{\odot}$ and the linear size is $\gtrsim 5\,$kpc. Thus our findings suggest that the object is a dusty dark dwarf galaxy. A substantial portion of faint submillimeter galaxies (SMGs) in the universe may be attributed to such dark objects.
description: 8 pages, 4 figures, accepted in ApJL
Alliance or acquisition? A mechanisms‐based, policy‐capturing analysis
Creators: name: Mellewigt, Thomas
name: Thomas, Adeline
name: Weller, Ingo
name: Zajac, Edward J.
Publisher: name: Freie Universität Berlin
Year: 2017
Subjects: subject: strategic alliances
subject: acquisitions
subject: prior ties
subject: alliance experience
subject: policy‐capturing
subject: scenario experiment
subject: 300 Sozialwissenschaften::330 Wirtschaft::330 Wirtschaft

description: Research summary: While alliance researchers view prior partner‐specific alliance experience as influencing firms' subsequent alliance or acquisition decisions, empirical evidence on the alliance versus acquisition decision is surprisingly mixed. We offer a reconciliation by proposing and testing an analytical framework that recognizes prior partner‐specific experiences as heterogeneous along three fundamental dimensions: partner‐specific trust, routines, and value certainty. This allows us to use a policy‐capturing methodology to rigorously operationalize and test our mechanism‐level predictions. We find that all three mechanisms can increase the likelihood of a subsequent alliance or acquisition, and in terms of the comparative choice between alliances versus acquisitions, partner‐specific trust pulls towards alliances, and value certainty pulls towards acquisitions. We conclude with a discussion of the theoretical and empirical implications of our approach and method. Managerial summary: This study focuses on an important corporate decision: When a firm has had an alliance with another firm, how would that experience affect the likelihood of a future alliance or acquisition with that same firm? We first suggest that it will depend on three factors: the level of trust that existed in that prior alliance, the extent to which specific work routines were developed, and the degree to which the firm was able to confidently assess the value of the partner firm's resources. We then find that trust is a particularly strong predictor of future alliances, while confidence regarding value more strongly predicts future acquisitions. In this way, we demonstrate more precisely how past corporate choices can affect (consciously or unconsciously) future ones.
Oriented pro-$\ell$ groups with the Bogomolov-Positselski property
Creators: name: Quadrelli, Claudio
name: Weigel, Thomas S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 12G05, Secondary 20E18, 20J06, 12F10

description: For a prime number $\ell$ we say that an oriented pro-$\ell$ group $(G,θ)$ has the Bogomolov-Positselski property if the kernel of the canonical projection on its maximal $θ$-abelian quotient $π^{ab}_{G,θ}\colon G\to G(θ)$ is a free pro-$\ell$ group contained in the Frattini subgroup of $G$. We show that oriented pro-$\ell$ groups of elementary type have the Bogomolov-Positselski property. This shows that Efrat's Elementary Type Conjecture implies a positive answer to Positselski's version of Bogomolov's Conjecture on maximal pro-$\ell$ Galois groups of a field $K$ in case that $K^\times/(K^\times)^\ell$ is finite. Secondly, it is shown that for an $H^\bullet$-quadratic oriented pro-$\ell$ group $(G,θ)$ the Bogomolov-Positselski property can be expressed by the injectivity of the transgression map $d_2^{2,1}$ in the Hochschild-Serre spectral sequence.
description: The title of the old version of this paper was {\guillemotleft}Oriented pro-$\ell$ groups with the Bogomolov property{\guillemotright}: following te referee's advice, we changed the name of the property we study from {\guillemotleft}Bogomolov property{\guillemotright} to {\guillemotleft}Bogomolov-Positselski property{\guillemotright}
Property Rights, Tenure Form, and Tenure Security
Creators: name: Masuda, Yuta J.
name: Robinson, Brian E.
name: Holland, Margaret
Publisher: name: Springer
Year: 2022

description: Land tenure security is often inconsistently defined, conceptualized, and measured. This can create confusion in research and practice. Here, we provide a summary of the differences between property rights, tenure form, and land tenure security. The chapter provides a brief review of the history and evolution of research on these topics, how they intersect, and why distinguishing these concepts is important for research and practice.
Anisotropic relativistic fluid spheres with a linear equation of state
Creators: name: Prasad, Amit Kumar
name: Kumar, Jitendra
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this work, we present a class of relativistic and well-behaved solution to Einstein's field equations for anisotropic matter distribution. We perform our analysis by using the Buchdahl ansatz for the metric function grr. Three different classes of new exact solution are found for anisotropy factor(delta). We have analyzed our model with various physical aspects such as pressure (radial as well as transverse), energy density, anisotropy factor, mass, compactness parameter, adiabatic index(gamma) and surface redshift. A graphical analysis of energy conditions, TOV equation and causality condition indicates the model are well behaved. The physical acceptability of the model has verified by considering compact objects with similar mass and radii, such as 4U 1820-30,Vela X-1, PSR J1614-2230, LMC X-4, SMC X-1, 4U 1538-52, Her X-1, Cyg X-2, PSR B1913+16 and PSR J1903+327.
description: arXiv admin note: text overlap with arXiv:1810.11324 by other authors
Relative-Zeta and Casimir energy for a semitransparent hyperplane selecting transverse modes
Creators: name: Cacciapuoti, Claudio
name: Fermi, Davide
name: Posilicano, Andrea
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81Q10, 81T55, 81T10

description: We study the relative zeta function for the couple of operators $A_0$ and $A_α$, where $A_0$ is the free unconstrained Laplacian in $L^2(\mathbf{R}^d)$ ($d \geq 2$) and $A_α$ is the singular perturbation of $A_0$ associated to the presence of a delta interaction supported by a hyperplane. In our setting the operatorial parameter $α$, which is related to the strength of the perturbation, is of the kind $α=α(-Δ_{\parallel})$, where $-Δ_{\parallel}$ is the free Laplacian in $L^2(\mathbf{R}^{d-1})$. Thus $α$ may depend on the components of the wave vector parallel to hyperplane; in this sense $A_α$ describes a semitransparent hyperplane selecting transverse modes. As an application we give an expression for the associated thermal Casimir energy. Whenever $α=χ_{I}(-Δ_{\parallel})$, where $χ_{I}$ is the characteristic function of an interval $I$, the thermal Casimir energy can be explicitly computed.
description: 21 pages
Constraining the Generalized Uncertainty Principle with the light twisted by rotating black holes and M87*
Creators: name: Tamburini, Fabrizio
name: Feleppa, Fabiano
name: Thidé, Bo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We test the validity of the Generalized Heisenberg's Uncertainty principle in the presence of strong gravitational fields nearby rotating black holes; Heisenberg's principle is supposed to require additional correction terms when gravity is taken into account, leading to a more general formulation also known as the Generalized Uncertainty Principle. Using as probe electromagnetic waves acquiring orbital angular momentum when lensed by a rotating black hole, we find from numerical simulations a relationship between the spectrum of the orbital angular momentum of light and the corrections needed to formulate the Generalized Uncertainty Principle, here characterized by the rescaled parameter $β_0$, a function of the Planck's mass and the bare mass of the black hole. Then, from the analysis of the observed twisted light due to the gravitational field of the compact object observed in M87*, we find new limits for the parameter $β_0$. With this method, complementary to black hole shadow circularity analyses, we obtain more precise limits from the experimental data of M87*, confirming the validity of scenarios compatible with General Relativity, within the uncertainties due to the experimental errors present in EHT data and those due to the numerical simulations and analysis.
description: 5 pages, 2 figures. v2: typos corrected
MPEC 2024-D139 : 2009 JB19
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
UT1 intensive observing program between Shanghai and Urumqi VGOS antennas
Creators: name: Gan, Jiangying
name: Shu, Fengchun
name: He, Xuan
name: Huang, Yidan
name: Guo, Li
name: Liu, Cong
name: Liu, Yuwei
Publisher: name: Zenodo
Year: 2024
Subjects: UT1 intensive

description: AbstractWe present an overview of the VLBI Intensive program observed between Shanghai(Seshan13 orTianma13) and Urumqi(Urumqi13) VGOS antennas for the rapid determination of the Earths rotation angle. Theprogram was initiated in May 2022 and run 3 times per week form March 2023. The goal is to evaluate theperformance of new VGOS stations, test new frequencies to avoid 5G RFI, and explore data transfer/correlationpipeline for rapid product service.

Keyword

UT1 intensive, VGOS antennas, 5G RFI, Earths rotation angle
Reducing Collectivity in a Kibbutz
Creators: name: Kressel, Gideon M.
name: Kressel, Gideon M.
Publisher: name: Unknown
Year: 1996
Subjects: Agribusiness

description: This article deals with one specific kibbutz whose location in central Israel exposes it to the atmosphere of capitalism and individualism, prevailing in adjacent urban centers. I began an anthropological study of kibbutz "GimmelResh" (alias) during the second half of the 1960s, observing it during a successful transition from a purely agricultural to an agro-industrial-based economy. By the 1970s it was known for being highly industrialized, as well as prosperous (Kressel, 1974; 1983). I resumed my observations at GimmelResh in Autumn 1987, as it was facing severe economic crisis. As of now, the kibbutz is deep in debt. It faces the dilemma whether to close down some of its industrial plants due to lack of manpower, thus foregoing income and incurring further debts, or to force members to work wherever required in the kibbutz. This however goes contrary to the emerging trend of letting the members decide upon their vocation and choose their place of work. My article relates the story of the two conflicting vogues.
Stepwise Goal-Driven Networks for Trajectory Prediction
Creators: name: Wang, Chuhua
name: Wang, Yuchen
name: Xu, Mingze
name: Crandall, David J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We propose to predict the future trajectories of observed agents (e.g., pedestrians or vehicles) by estimating and using their goals at multiple time scales. We argue that the goal of a moving agent may change over time, and modeling goals continuously provides more accurate and detailed information for future trajectory estimation. To this end, we present a recurrent network for trajectory prediction, called Stepwise Goal-Driven Network (SGNet). Unlike prior work that models only a single, long-term goal, SGNet estimates and uses goals at multiple temporal scales. In particular, it incorporates an encoder that captures historical information, a stepwise goal estimator that predicts successive goals into the future, and a decoder that predicts future trajectory. We evaluate our model on three first-person traffic datasets (HEV-I, JAAD, and PIE) as well as on three bird's eye view datasets (NuScenes, ETH, and UCY), and show that our model achieves state-of-the-art results on all datasets. Code has been made available at: https://github.com/ChuhuaW/SGNet.pytorch.
description: Accepted By RA-L and ICRA2022
Chasing the thermodynamical noise limit in whispering-gallery-mode resonators for ultrastable laser frequency stabilization
Creators: name: Lim, Jinkang
name: Savchenkov, Anatoliy A.
name: Dale, Elijah
name: Liang, Wei
name: Eliyahu, Danny
name: Ilchenko, Vladimir
name: Matsko, Andrey B.
name: Maleki, Lute
name: Wong, Chee Wei
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Ultrastable high-spectral-purity lasers have served as the cornerstone behind optical atomic clocks, quantum measurements, precision optical-microwave generation, high resolution optical spectroscopy and sensing. Hertz-level lasers stabilized to high finesse Fabry-Pérot mirror cavities are typically used for these studies but are large and fragile such that they have remained laboratory instruments. There is a clear demand in rugged miniaturized lasers operating potentially at comparable stabilities to those bulk lasers. Over the past decade, ultrahigh-Q optical whispering-gallery-mode (WGM) resonators have served as a platform for low-noise microlasers but have not yet reached the ultimate stabilities defined by their fundamental noise. Here, we show the noise characteristics of WGM resonators and demonstrate a resonator-stabilized laser at the fundamental limit by compensating the intrinsic thermal expansion of a WGM resonator, allowing a sub-25 Hz linewidth and a 32 Hz Allan deviation on the 191 THz carrier in 100 ms integration. We also reveal the environmental sensitivities of the resonator at the thermodynamical noise limit and long-term frequency drifts governed by random-walk-noise statistics.
Invariant subspaces of elliptic systems II: spectral theory
Creators: name: Capoferri, Matteo
name: Vassiliev, Dmitri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: primary 35P20, secondary 47A15, 35J46, 35J47, 35J48, 58J05, 58J40, 58J45

description: Consider an elliptic self-adjoint pseudodifferential operator $A$ acting on $m$-columns of half-densities on a closed manifold $M$, whose principal symbol is assumed to have simple eigenvalues. We show that the spectrum of $A$ decomposes, up to an error with superpolynomial decay, into $m$ distinct series, each associated with one of the eigenvalues of the principal symbol of $A$. These spectral results are then applied to the study of propagation of singularities in hyperbolic systems. The key technical ingredient is the use of the carefully devised pseudodifferential projections introduced in the first part of this work, which decompose $L^2(M)$ into almost-orthogonal almost-invariant subspaces under the action of both $A$ and the hyperbolic evolution.
description: Minor edits, to appear in Journal of Spectral Theory
Zielgruppenmodelle für Massnahmen zur Reduktion des Energieverbrauchs
Creators: name: Ohnmacht, Timo
Publisher: name: Zenodo
Year: 2020

description: Kein Abstract vorhanden
description: + ID der Publikation: hslu_76145 + Art des Beitrages: Referat/Vortrag + Sprache: Deutsch + Letzte Aktualisierung: 2020-02-04 15:57:15
The long-period binary central stars of the planetary nebulae NGC 1514 and LoTr 5
Creators: name: Jones, David
name: Van Winckel, Hans
name: Aller, Alba
name: Exter, Katrina
name: De Marco, Orsola
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The importance of long-period binaries on the formation and evolution of planetary nebulae is still rather poorly understood, in part due to the lack of central star systems known to comprise such long-period binaries. Here, we report on the latest results from the on-going Mercator-HERMES survey for variability in the central stars of planetary nebulae. We present a study of the central stars of NGC 1514, BD+30$^\circ$623, the spectrum of which shows features associated with a hot nebular progenitor as well as a possible A-type companion. Cross-correlation of high-resolution HERMES spectra against synthetic spectra shows the system to be a highly eccentric ($e\sim0.5$), double-lined binary with a period of $\sim$3300 days. Previous studies indicated that the cool component might be a Horizontal Branch star of mass $\sim$0.55 M$_\odot$ but the observed radial velocity amplitudes rule out such a low mass. Assuming the nebular symmetry axis and binary orbital plane are perpendicular, the data are more consistent with a post-main-sequence star ascending towards the Giant Branch. We also present the continued monitoring of the central star of LoTr 5, HD 112313, which has now completed one full cycle, allowing the orbital period (P$\sim$2700 days) and eccentricity ($e\sim0.3$) to be derived. To date, the orbital periods of BD+30$^\circ$623 and HD 112313 are the longest to have been measured spectroscopically in the central stars of planetary nebulae. Furthermore, these systems, along with BD+33$^\circ$2642, comprise the only spectroscopic wide-binary central stars currently known.
description: 4 pages, 4 figures, 2 tables. Accepted for publication in Astronomy and Astrophysics Letters
On the action of the toggle group of the Dynkin diagram of type A
Creators: name: Numata, Yasuhide
name: Yamanouchi, Yuiko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 20B20, 05E16, 05C69,

description: In this article, we consider involutions, called togglings, on the set of independent sets of the Dynkin diagram of type A, or a path graph. We are interested in the action of the subgroup of the symmetric group of the set of independent sets generated by togglings. We show that the subgroup coincides with the symmetric group.
High-redshift radio galaxy searches with the MeerKAT Galaxy Cluster Legacy Survey
Creators: name: Cossa, Vasco
Publisher: name: Zenodo
Year: 2024

description: I will present the results of my Masters project to comprehensively search for high-redshift radio galaxies (HzRGs) within 20 fields of the MeerKAT Galaxy Cluster Legacy Survey's first data release. These fields stand out due to their robust dynamic range and all-encompassing coverage across the optical and infrared spectrum through the Dark Energy Camera Legacy Survey and the All-sky Wide Infrared Survey Explorer surveys. HzRGs, potentially precursors to local elliptical galaxies, offer a unique lens for exploring diverse astrophysical phenomena, including large-scale cosmic structures, galaxy evolution, and the epoch of reionization. Leveraging adept multiwavelength cross-matching techniques, the candidate pool has been meticulously refined, further bolstered by harnessing in-band spectral indices derived from MeerKAT data. MeerKAT's extreme sensitivity has allowed us to detect a large number of new HzRG candidates, at radio luminosities an order of magnitude lower than other studies, effectively positioning them for subsequent spectroscopic analysis.
FANet: A Feedback Attention Network for Improved Biomedical Image Segmentation
Creators: name: Tomar, Nikhil Kumar
name: Jha, Debesh
name: Riegler, Michael A.
name: Johansen, Håvard D.
name: Johansen, Dag
name: Rittscher, Jens
name: Halvorsen, Pål
name: Ali, Sharib
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The increase of available large clinical and experimental datasets has contributed to a substantial amount of important contributions in the area of biomedical image analysis. Image segmentation, which is crucial for any quantitative analysis, has especially attracted attention. Recent hardware advancement has led to the success of deep learning approaches. However, although deep learning models are being trained on large datasets, existing methods do not use the information from different learning epochs effectively. In this work, we leverage the information of each training epoch to prune the prediction maps of the subsequent epochs. We propose a novel architecture called feedback attention network (FANet) that unifies the previous epoch mask with the feature map of the current training epoch. The previous epoch mask is then used to provide a hard attention to the learned feature maps at different convolutional layers. The network also allows to rectify the predictions in an iterative fashion during the test time. We show that our proposed \textit{feedback attention} model provides a substantial improvement on most segmentation metrics tested on seven publicly available biomedical imaging datasets demonstrating the effectiveness of FANet. The source code is available at \url{https://github.com/nikhilroxtomar/FANet}.
Shaping of olfactory glomerular circuit and fear learning by GABA(B) receptor- mediated inhibitory signaling
Creators: name: Bakir, Alper Kagan
Publisher: name: No Publisher Supplied
Year: 2022

description: Historically, research on association learning has always been focused on the cortical and limbic areas. However, it has been known since the 80’s that sensory systems are capable of playing a role in this type of learning as well. Neural correlates of association learning has been observed in several sensory systems, including olfactory system. In the olfactory bulb, it is possible to observe learning induced, stimulus specific plasticity as early as the olfactory sensory neurons. Although the existence of this phenomenon has been shown throughout the olfactory glomerular circuit, there has not been many conclusive findings about the neural underpinnings of it. One of the candidates that may play an important role in establishing this plasticity is changes in GABAᴃ receptor-mediated inhibitory signaling. To investigate if GABAᴃ receptor plasticity is utilized in inducing odor-specific changes in the olfactory system, this study had two goals; understanding the role of the receptor in normal functioning across the glomerular circuit and examining how it changes after odor-specific fear learning. To reach these goals used calcium imaging on behaviorally trained subjects expressing GCaMP6 in OSN, PG or mitral cells before and after application of CGP35348 (a GABAᴃ antagonist). Blockade of GABAᴃ receptors on the OSN axon terminals increased the odor-evoked response amplitudes in all cell types. In the behavioral control groups this increase was not odor dependent. In the animals that received a CS-US fear training, however, the increase in odor-evoked responses for the CS+ odor was significantly lower than the other odors, regardless of the cell type. Furthermore, the results showed that CGP35348 showed its full effects towards the end of the odor-evoked signal and in the fear conditioned animals this latency was even bigger. Overall, our findings suggest that changes in GABAᴃ receptor mediated inhibitory signaling plays an important role in the forming of association learning in the olfactory system, across all the cells that take part in the glomerular circuit.
Geological storage of hydrogen: natural analogues, flow cell experiments and mass transport modelling
Creators: name: McMahon, Christopher
Publisher: name: The University of Edinburgh
Year: 2019
Subjects: Cushion gas
Blue hydrogen
Energy storage
Hydrogen

description: Decarbonising the global energy mix is crucial to lowering greenhouse gas emissions and combating climate change. The introduction of renewable (low carbon) energy sources and the removal of fossil fuel energy sources creates uncertainty in energy supply and energy security, particularly across seasonal timescales. Many types of energy storage schemes could store large amounts (up to TW) of excess energy for use when demand is high (e.g. Pumped Hydropower, Batteries), however only the geological storage of hydrogen has the capability to sustain energy demand over seasonal timescales, while also decarbonising multiple energy sectors (e.g. heat, transport, power and industry). Currently, to sustain hydrogen production at large scale requires the use of fossil fuels (steam methane reformation, SMR) and to be low carbon, requires carbon capture, utilisation and storage (CCUS). This research explores the potential of coupling hydrogen production from SMR with CCUS, using the produced CO₂ as the cushion gas for the hydrogen storage reservoir. State of the art 1D hydrogen flow experiments coupled with analytical and numerical models are used to characterise how hydrogen and CO₂ mixtures behave in porous media. The results show that the type of cushion gas influences the speed which hydrogen flows through porous rock and that the key mass transport processes in operation are dispersion and matrix diffusion. The results highlight the need for better characterisation of hydrogen properties to understand how hydrogen would behave under subsurface storage conditions. The large-scale deployment of hydrogen as a low carbon energy vector will require further in-situ pilot projects to demonstrate a safety case, appropriate site suitability assessments, supportive policy frameworks and crucially a positive public image.
NuPS: A Parameter Server for Machine Learning with Non-Uniform Parameter Access
Creators: name: Renz-Wieland, Alexander
name: Gemulla, Rainer
name: Kaoudi, Zoi
name: Markl, Volker
Publisher: name: arXiv
Year: 2021
Subjects: subject: Databases (cs.DB)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Parameter servers (PSs) facilitate the implementation of distributed training for large machine learning tasks. In this paper, we argue that existing PSs are inefficient for tasks that exhibit non-uniform parameter access; their performance may even fall behind that of single node baselines. We identify two major sources of such non-uniform access: skew and sampling. Existing PSs are ill-suited for managing skew because they uniformly apply the same parameter management technique to all parameters. They are inefficient for sampling because the PS is oblivious to the associated randomized accesses and cannot exploit locality. To overcome these performance limitations, we introduce NuPS, a novel PS architecture that (i) integrates multiple management techniques and employs a suitable technique for each parameter and (ii) supports sampling directly via suitable sampling primitives and sampling schemes that allow for a controlled quality--efficiency trade-off. In our experimental study, NuPS outperformed existing PSs by up to one order of magnitude and provided up to linear scalability across multiple machine learning tasks.
description: SIGMOD '22
The impact of GCN2 deletion on protein degradation in the liver during asparaginase exposure
Creators: name: Burns, Jeffrey Baur
Publisher: name: No Publisher Supplied
Year: 2022

description: Asparaginase is a biological chemotherapeutic used to treat acute lymphoblastic leukemia. A common side effect in patient populations is hepatotoxicity. Previously, our lab revealed that GCN2 plays an integral role in protecting the liver from these effects, and the absence of GCN2 leads to severe liver steatosis. The development of hepatic steatosis during asparaginase exposure was determined to be due to impaired triglyceride export which corresponded with reduced ApoB100 protein abundance. This thesis investigated the role of protein degradation in the loss of ApoB100 protein during asparaginase exposure. Wild type and GCN2KO mice were intraperitoneally-administered a single injection of asparaginase and then euthanized at various time points up to 24 hours post-exposure. At 6 hours post-exposure, transmission electron microscopy of liver sections suggested minimal autophagosome formation in the livers of mice exposed to asparaginase. However, biochemical markers of autophagy initiation and lysosomal degradation suggested that asparaginase promoted autophagy in a GCN2 dependent manner. Loss of GCN2 led to a decrease in markers of autophagy initiation, followed by an increase in markers for lysosomal degradation. The aberrant activation of mTORC1, resulting in increased inhibitory phosphorylation of ULK1, was also shown to influence this response, being largely GCN2 dependent during asparaginase stress. Finally, it was shown that core autophagy genes are decreased in GCN2KO mice exposed to asparaginase, whereas genes for ER stress and the ubiquitin-proteasome system were increased along with total protein ubiquitination. This thesis demonstrates a loss of GCN2 leads to a stalling of autophagy with an increased ER stress response after asparaginase exposure.
Kibbutz, Cooperation and the Issue of Embeddedness
Creators: name: Levi, Yair
name: Levi, Yair
Publisher: name: Unknown
Year: 1996
Subjects: Agribusiness

description: The contemporary kibbutz is the best exemplification of the fifth and last stage of cooperative development envisaged by the Rochdale Pioneers when they opened their consumer store in 1844. This closeness to the modern cooperative movement at its birth, however, didn't contribute to a feeling of belonging to a "cooperative family". Throughout the years, despite its formal cooperative incorporation, the kibbutz considered itself as a meta-cooperative phenomenon. The idea that, being situated at the apex of a pyramid of levels of cooperative integration, might confer on the kibbutz the task of extending self-management - as a social resource - to other segments of society, never became part of its political-ideological agenda. On the other hand, the Israeli society seems to badly need alternatives to such prevailing patterns as over-consumption, selfinterest and profit-seeking. When properly understood and implemented, the cooperative model can offer a valid alternative by subordinating the economic component to the social one. The first is embedded in the latter, in a system which - by definition - remunerates participation rather than capital. It is argued that failure to see the kibbutz as part of a macro network of horizontal solidary links, prevented it from acting as an outward-oriented "change agent" of cooperation and possibly contributed to weaken its inner structure as a comprehensive all-village cooperative. Both levels - the micro local and the macro national - seem to be at a loss.
Oral Health in Zero Gravity: A Comprehensive Review of Orofacial Effects and Countermeasures in Spaceflights
Creators: name: Harika, Pedada Divya
name: Mehta, Karan Hiral
name: Pulluri, Saraswathi Sravani
name: Rana, Priyanka
name: Rajani, Hanmandla
name: Aiman, Ayesha
Publisher: name: Cureus
Year: 2023

description: Space is a complex and challenging setting encompassing the region beyond Earth's atmosphere where astronauts and spacecraft operate. The unique conditions of spaceflights, particularly microgravity and radiation, pose significant challenges to astronaut health, including the orofacial region. It has effects on saliva production, microbial composition, and oral hygiene practices, which influence oral health status, such as increased risk of dental caries, gum diseases, oral discomfort, temporomandibular joint dysfunctions, sialoliths, pain and dysesthesia in the teeth and oral mucosa, masticatory muscle atrophy, and oral cancer which can be detrimental during prolonged missions. Hence, a comprehensive approach to dental care in space is imperative to ensure astronauts' well-being and overall health as we strive to extend our presence beyond Earth. This literature review paper sheds light on the intricate effects of space on the orofacial region and delves into the unique challenges astronauts face in upholding optimal oral health while in space. It explores the current state of dentistry in space and discusses advancements and strategies that aim to maintain optimal oral health for astronauts during extended space missions.
Supplementary document for High Frequency Characterization of PZT Thin-Films Deposited by chemical Solution Deposition on SOI for Integrated High Speed Electro-Optic Modulators - 6480386.pdf
Creators: name: Feutmba, Gilles
name: Da Silva, Leandro
name: Singh, Nishant
name: Breyne, Laurens
name: De Geest, Kobe
name: George, John
name: Bauwelinck, Johan
name: Van Thourhout, Dries
name: Yin, Xin
name: Beeckman, Jeroen
Publisher: name: Optica Publishing Group
Year: 2023
Subjects: Uncategorized

description: Supplemental document
Annotating Object Instances with a Polygon-RNN
Creators: name: Castrejon, Lluis
name: Kundu, Kaustav
name: Urtasun, Raquel
name: Fidler, Sanja
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: We propose an approach for semi-automatic annotation of object instances. While most current methods treat object segmentation as a pixel-labeling problem, we here cast it as a polygon prediction task, mimicking how most current datasets have been annotated. In particular, our approach takes as input an image crop and sequentially produces vertices of the polygon outlining the object. This allows a human annotator to interfere at any time and correct a vertex if needed, producing as accurate segmentation as desired by the annotator. We show that our approach speeds up the annotation process by a factor of 4.7 across all classes in Cityscapes, while achieving 78.4% agreement in IoU with original ground-truth, matching the typical agreement between human annotators. For cars, our speed-up factor is 7.3 for an agreement of 82.2%. We further show generalization capabilities of our approach to unseen datasets.
Galaxy power spectrum and biasing results from the LOFAR Two-metre Sky Survey (first data release)
Creators: name: Tiwari, Prabhakar
name: Zhao, Ruiyang
name: Zheng, Jinglan
name: Zhao, Gong-Bo
name: Bacon, David
name: Schwarz, Dominik J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing survey aiming to observe the entire Northern sky, providing an excellent opportunity to study the distribution and evolution of the large-scale structure of the Universe. The source catalogue from the public LoTSS first data release (DR1) covers 1% of the sky, and shows correlated noise or fluctuations of the flux density calibration on few degree scales. We explore the LoTSS DR1 to understand the survey systematics and data quality of this first data release. We produce catalog mocks to estimate uncertainties, and measure the angular clustering statistics of LoTSS galaxies, which fit the $Λ$CDM cosmology reasonably well. We employ a Markov chain Monte Carlo (MCMC) based Bayesian analysis to recover the best galaxy biasing scheme and multi-component source fraction for LoTSS DR1 above $1$ mJy assuming different possible redshift templates. After masking some noisy and uneven patches and with suitable flux density cuts, the LOFAR survey appears qualified for large-scale cosmological studies. The upcoming data releases from LOFAR are expected to be deeper and wider, and will therefore provide improved cosmological measurements.
description: 12 pages, 16 figures, 1 Table, accepted for publication in ApJ
Pion form factor from an AdS deformed background
Creators: name: Contreras, Miguel Angel Martin
name: Capossoli, Eduardo Folco
name: Li, Danning
name: Vega, Alfredo
name: Boschi-Filho, Henrique
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We consider a bottom-up AdS/QCD model with a conformal exponential deformation $e^{k\,z^2}$ on a Lorentz invariant AdS background. In this model, we assume the conformal dimension associated with the operator that creates pions at the boundary as $Δ=3$. Regarding the infrared scale related to photon field $k_γ$, we analyze two cases: constant and depending on the transferred momentum $q$. In these two cases, we computed the electromagnetic pion form factor as well as the pion radius. We compare our results with experimental data as well as other theoretical (holographic and non-holographic) models. In particular, for the momentum-dependent infrared scale, we find good agreement with the available experimental data as well as non-holographic models.
description: V1, 23 pages, 4 figures
Algorithms For Longest Chains In Pseudo- Transitive Graphs
Creators: name: Shahrokhi, Farhad
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computational Geometry (cs.CG)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: A directed acyclic graph G = (V, E) is pseudo-transitive with respect to a given subset of edges E1, if for any edge ab in E1 and any edge bc in E, we have ac in E. We give algorithms for computing longest chains and demonstrate geometric applications that unify and improves some important past results. (For specific applications see the introduction.)
description: The results in the paper had been announced in Elbe Sandstones Geometry Workshop, July 2001, Charles University, Prague, Czech Republic and DIMACS workshop on geometric graph theory, Rutgers University, NJ, 2002