cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Squeezing-enhanced quantum sensing with quadratic optomechanics
Creators: name: Zhang, Sheng-Dian
name: Wang, Jie
name: Zhang, Qian
name: Jiao, Ya-Feng
name: Zuo, Yun-Lan
name: Özdemir, Şahin K.
name: Qiu, Cheng-Wei
name: Nori, Franco
name: Jing, Hui
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Cavity optomechanical (COM) sensors, enhanced by quantum squeezing or entanglement, have become powerful tools for measuring ultra-weak forces with high precision and sensitivity. However, these sensors usually rely on linear COM couplings, a fundamental limitation when measurements of the mechanical energy are desired. Very recently, a giant enhancement of the signal-to-noise ratio was predicted in a quadratic COM system. Here we show that the performance of such a system can be further improved surpassing the standard quantum limit by using quantum squeezed light. Our approach is compatible with available engineering techniques of advanced COM sensors and provides new opportunities for using COM sensors in tests of fundamental laws of physics and quantum metrology applications.
description: 7+7 pages, 4+2 figures
SNAP-25 is a promising novel cerebrospinal fluid biomarker for synapse degeneration in Alzheimer’s disease
Creators: name: Brinkmalm, Ann
name: Brinkmalm, Gunnar
name: Honer, William G. (William George), 1957-
name: Frölich, Lutz
name: Hausner, Lucrezia
name: Minthon, Lennart
name: Hansson, Oskar
name: Wallin, Anders
name: Zetterberg, Henrik
name: Blennow, Kaj
name: Öhrfelt, Annika
Publisher: name: BioMed Central
Year: 2016

description: Background: Synaptic degeneration is an early pathogenic event in Alzheimer’s disease, associated with cognitive impairment and disease progression. Cerebrospinal fluid biomarkers reflecting synaptic integrity would be highly valuable tools to monitor synaptic degeneration directly in patients. We previously showed that synaptic proteins such as synaptotagmin and synaptosomal-associated protein 25 (SNAP-25) could be detected in pooled samples of cerebrospinal fluid, however these assays were not sensitive enough for individual samples. Results: We report a new strategy to study synaptic pathology by using affinity purification and mass spectrometry to measure the levels of the presynaptic protein SNAP-25 in cerebrospinal fluid. By applying this novel affinity mass spectrometry strategy on three separate cohorts of patients, the value of SNAP-25 as a cerebrospinal fluid biomarker for synaptic integrity in Alzheimer’s disease was assessed for the first time. We found significantly higher levels of cerebrospinal fluid SNAP-25 fragments in Alzheimer’s disease, even in the very early stages, in three separate cohorts. Cerebrospinal fluid SNAP-25 differentiated Alzheimer’s disease from controls with area under the curve of 0.901 (P < 0.0001). Conclusions: We developed a sensitive method to analyze SNAP-25 levels in individual CSF samples that to our knowledge was not possible previously. Our results support the notion that synaptic biomarkers may be important tools for early diagnosis, assessment of disease progression, and to monitor drug effects in treatment trials.
Existence of the equivariant minimal model program for compact Kähler threefolds with the action of an abelian group of maximal rank
Creators: name: Zhong, Guolei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Geometry (math.AG)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 14E30, 14J30, 14J50

description: Let $X$ be a $\mathbb{Q}$-factorial compact Kähler klt threefold admitting an action of a free abelian group $G$, which is of positive entropy and of maximal rank. After running the $G$-equivariant log minimal model program, we show that such $X$ is either rationally connected or bimeromorphic to a $Q$-complex torus. In particular, we fix an issue in the proof of our previous paper.
description: Minor revision, 13 pages, Mathematische Nachrichten (to appear)
Bythinella eleousae Glöer & Hirschfelder, 2020, n. sp.
Creators: name: Glöer, Peter
name: Hirschfelder, Hans-Jürgen
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Bythinellidae
Bythinella
Bythinella eleousae

description: Bythinella eleousae n. sp. [fig. 2.1]
 Type locality: Greece, Phocis, Parnassus Mountains, Polidrosos, Kifisou Spring at the ruin of the Byzantine church Agia Eleousa, 1.5 km SW of Polidrosos, N 38°37'45.1" / E 22°31'12.4", 311 m a.s.l., 07.05.2017, leg. Hans-Jürgen & Andrea Hirschfelder.
 Type Material: Holotype (ZMH 140676): Shell height 2.95 mm, shell width 1.9 mm. Paratypes from type locality: ZMH (140677/1), coll. Hirschfelder (7 adult, 2 subadult).
 Etymology: The new species is named after the Byzantine church Agia Eleousa. The type locality is situated just below that ruin.
 Description:
 Shell: The shell is cylindrical with a flat apex and relatively broad. The 4.5-5 whorls are slightly convex with a clear suture. The body whorl takes about 0.75 of shell height. The aperture is ovate, with a sharp peristome. The umbilicus is slit-like. The shell is 2.8-3.1 mm high and 1.8-1.9 mm broad.
 Differentiating characters: The new species exhibits the smallest length to width ratio (1.50-1.55) of all Greek Bythinella species. The most similar form is B. kwanti Glöer & Reuselaars, 2020, from the area of Kalavrita with a ratio of 1.6. In all other species that ratio is (much) higher.
 Distribution: Only known from type locality on the northern slope of the Parnassus Mountains.
description: Published as part of Glöer, Peter & Hirschfelder, Hans-Jürgen, 2020, Some new Bythinella spp. from southern Greece (Gastropoda: Bythinellidae), pp. 60-67 in Ecologica Montenegrina 30 on page 63, DOI: 10.37828/em.2020.30.5, http://zenodo.org/record/13231395
S-OPT: A Points Selection Algorithm for Hyper-Reduction in Reduced Order Models
Creators: name: Lauzon, Jessica T.
name: Cheung, Siu Wun
name: Shin, Yeonjong
name: Choi, Youngsoo
name: Copeland, Dylan Matthew
name: Huynh, Kevin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 37M99, 65M99, 76D05, 67Q05

description: While projection-based reduced order models can reduce the dimension of full order solutions, the resulting reduced models may still contain terms that scale with the full order dimension. Hyper-reduction techniques are sampling-based methods that further reduce this computational complexity by approximating such terms with a much smaller dimension. The goal of this work is to introduce a points selection algorithm developed by Shin and Xiu [SIAM J. Sci. Comput., 38 (2016), pp. A385--A411], as a hyper-reduction method. The selection algorithm is originally proposed as a stochastic collocation method for uncertainty quantification. Since the algorithm aims at maximizing a quantity S that measures both the column orthogonality and the determinant, we refer to the algorithm as S-OPT. Numerical examples are provided to demonstrate the performance of S-OPT and to compare its performance with an over-sampled Discrete Empirical Interpolation (DEIM) algorithm. We found that using the S-OPT algorithm is shown to predict the full order solutions with higher accuracy for a given number of indices.
description: 26 pages, 15 figures, submitted to SIAM Journal of Scientific Computing
On $n$-universal quadratic forms over dyadic local fields
Creators: name: He, Zilong
name: Hu, Yong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $ n \ge 2$ be an integer. We give necessary and sufficient conditions for an integral quadratic form over dyadic local fields to be $ n $-universal by using invariants from Beli's theory of bases of norm generators. Also, we provide a minimal set for testing $ n $-universal quadratic forms over dyadic local fields, as an analogue of Bhargava and Hanke's 290-theorem (or Conway and Schneeberger's 15-theorem) on universal quadratic forms with integer coefficients.
description: This version has been accepted for publication in SCIENCE CHINA Mathematics
Proton and pion distribution functions in counterpoint
Creators: name: Lu, Ya
name: Chang, Lei
name: Raya, Khépani
name: Roberts, Craig D.
name: Rodríguez-Quintero, José
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Working with proton and pion valence distribution functions (DFs) determined consistently at the same, unique hadron scale and exploiting the possibility that there is an effective charge which defines an evolution scheme for DFs that is all-orders exact, we obtain a unified body of predictions for all proton and pion DFs - valence, glue, and four-flavour-separated sea. Whilst the hadron light-front momentum fractions carried by identifiable parton classes are the same for the proton and pion at any scale, the pointwise behaviour of the DFs is strongly hadron-dependent. All calculated distributions comply with quantum chromodynamics constraints on low- and high-$x$ scaling behaviour and, owing to emergent hadron mass, pion DFs are the most dilated. These results aid in elucidating the sources of similarities and differences between proton and pion structure.
description: 8 pages, 4 figures, 2 tables
VVVX near-IR photometry for 99 low-mass stars in the Gaia EDR3 Catalog of Nearby Stars
Creators: name: Mejías, Andrea
name: Minniti, Dante
name: Alonso-García, Javier
name: Beamín, Juan Carlos
name: Saito, Roberto K.
name: Solano, Enrique
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: 85-00

description: Red dwarf stars, which represent 75% of stars in the Milky Way, can be studied in great detail in the solar neighborhood where the sample is more complete. We intend to better characterize red dwarf candidates selected from the Gaia Catalog of Nearby Stars using optical and near-infrared photometry from the VVVX Survey, DECaPS, Pan-STARRS, and WISE. We performed a cross-matching procedure among the positions of a color-selected sample of M dwarfs in the VVVX Survey and the Gaia EDR3 sub-catalog of nearby stars. We explored their stellar parameters and spectral types using VOSA. Radii were also obtained using the Stefan-Boltzmann equation. Masses and ages were computed for some of the objects using evolutionary tracks and isochrones. Additional mass estimations were obtained with the MKs - M* relation. We then validated our results for the stellar parameters of two of our objects with spectra obtained with the TripleSpec instrument at the SOAR telescope, as well as those of our total amount of stars through a direct comparison with an independent sample from the literature. We revised the objects in our sample and compared their proper motion vectors with other sources within 30" to identify possible companions and probed their RUWE values to identify unresolved companions. We present a catalog of physical parameters for 99 low-mass objects with distances from 43.2 to 111.3 pc. Teffs range from 2500 to 3400 K, with the majority of stars in the sample compatible with being M4 dwarfs. We obtained a good agreement between the stellar parameters computed with VOSA and the estimations from observed spectra, also when comparing with an independent sample from the literature. The distribution of masses obtained with VOSA is concentrated toward the very low-mass regime. Eight objects present values of RUWE >= 1.4 and seven are consistent with being part of a binary system.
description: 11 pages, 9 figures
Effective qubit dephasing induced by spectator-qubit relaxation
Creators: name: Jurcevic, Petar
name: Govia, Luke C. G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In many leading architectures for quantum computing, it remains to be understood if we can equate single-qubit coherence times measured in isolation, to that of coherence times measured in multi-qubit devices. On a multi-qubit superconducting circuit platform we show an increase in the dephasing rate of a control qubit due to the spontaneous relaxation of spectator qubits coupled to the control qubit. We attribute this increased dephasing to random in time Z-phase kicks on the control qubit due to the interplay between spectator relaxation and the control-spectator ZZ- interaction. We measure the magnitude of this extra dephasing using Ramsey decay experiments, show how it can be corrected via dynamical decoupling pulse sequences, and demonstrate that randomized benchmarking is insensitive to the effect. Our experimental results are supported by a robust theoretical model that captures an arbitrary number of spectator qubits, and gives a simple, intuitive picture for the mechanism behind the enhanced dephasing.
Tropical Mirror
Creators: name: Losev, Andrey
name: Lysov, Vyacheslav
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We describe the tropical curves in toric varieties and define the tropical Gromov-Witten invariants. We introduce amplitudes for the higher topological quantum mechanics (HTQM) on special trees and show that the amplitudes are equal to the tropical Gromov-Witten invariants. We show that the sum over the amplitudes in $A$-model HTQM equals the total amplitude in B-model HTQM, defined as a deformation of the $A$-model HTQM by the mirror superpotential. We derived the mirror superpotentials for the toric varieties and showed that they coincide with the superpotentials in the mirror Landau-Ginzburg theory. We construct the mirror dual states to the evaluation observables in the tropical Gromov-Witten theory.
Prevalence of critical hypokalemia and hyponatremia among children hospitalized with severe acute malnutrition in West Africa
Creators: name: Scientific Days
name: Maillard, Antoine
name: Phelan, Kevin
name: Shepherd, Susan
Publisher: name: F1000 Research Limited
Year: 2020

description: Poster shared at MSF Scientific Days International (London), May 13/14, 2020.
Comparison of the canonical transformation and energy functional formalisms for ab initio calculations of self-localized polarons
Creators: name: Luo, Yao
name: Chang, Benjamin K.
name: Bernardi, Marco
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In materials with strong electron-phonon (e-ph) interactions, charge carriers can distort the surrounding lattice and become trapped, forming self-localized (small) polarons. We recently developed an ab initio approach based on canonical transformations to efficiently compute the formation and energetics of small polarons[1]. A different approach based on a Landau-Pekar energy functional has been proposed in the recent literature [2,3]. In this work, we analyze and compare these two methods in detail. We show that the small polaron energy is identical in the two formalisms when using the same polaron wave function. We also show that our canonical transformation formalism can predict polaron band structures and can properly treat zero- and finite-temperature lattice vibration effects, although at present using a fixed polaron wave function. Conversely, the energy functional approach can compute the polaron wave function, but as we show here it neglects lattice vibrations and cannot address polaron self-localization and thermal band narrowing. Taken together, this work relates two different methods developed recently to study polarons from first-principles, highlighting their merits and shortcomings and discussing them both in a unified formalism.
description: 14 pages, 3 figures
Uptake of a women-only, sex-work-specific drop-in center and links with sexual and reproductive health care for sex workers
Creators: name: Kim, Rachel
name: Goldenberg, Shira
name: Duff, Putu
name: Nguyen, Paul
name: Gibson, Kate
name: Shannon, K.
Publisher: name: The University of British Columbia
Year: 2017

description: OBJECTIVE: To longitudinally examine female sex workers' (FSWs') uptake of a women-only, sex-work-specific drop-in service and its impact on their access to sexual and reproductive health (SRH) services. METHODS: For the present longitudinal analysis, data were drawn from the AESHA (An Evaluation of Sex Workers' Health Access) study, a community-based, open, prospective cohort of FSWs from Vancouver, BC, Canada. Data obtained between January 2010 and February 2013 were analyzed. Participants are followed up on a semi-annual basis. Multivariable logistic regression using generalized estimating equations was used to identify correlates of service uptake. RESULTS: Of 547 FSWs included in the present analysis, 330 (60.3%) utilized the services during the 3-year study period. Service use was independently associated with age (adjusted odds ratio [AOR] 1.04; 95% confidence interval [CI] 1.03-1.06), Aboriginal ancestry (AOR 2.18; 95% CI 1.61-2.95), injection drug use (AOR 1.67; 95% CI 1.29-2.17), exchange of sex for drugs (AOR 1.40; 95%CI 1.15-1.71), and accessing SRH services (AOR 1.65; 95% CI 1.35-2.02). CONCLUSION: A sex-work-specific drop-in space for marginalized FSWs had high uptake. Women-centered and low-threshold drop-in services can effectively link marginalized women with SRH services
Optimising recruitment to a TB clinical trail in Uzbekistan
Creators: name: A Wharton-Smith
name: N Gray
name: B Stringer
name: G Allanazarova
name: N Parpieva
name: Z Tigay
name: S Horter
name: J Singh
name: E Douch
name: B-T Nyang'wa
Publisher: name: F1000 Research Limited
Year: 2020

description: Poster presented at MSF Scientific Days International (London), May 13/14, 2020.
Bythinella kastaliae Glöer & Hirschfelder, 2020, n. sp.
Creators: name: Glöer, Peter
name: Hirschfelder, Hans-Jürgen
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Bythinellidae
Bythinella
Bythinella kastaliae

description: Bythinella kastaliae n. sp. [fig. 2.2]
 Type locality: Greece, Phocis, Delphi, Kastalia Spring, N 38°28'58.8" / E 22°30'19.1", 530 m a.s.l., 05.05.2017, leg. Hans-Jürgen Hirschfelder.
 Type Material: Holotype (ZMH 140678): Shell height 2.8 mm, shell width 1.7 mm. Paratypes from type locality: ZMH (140679/1), coll. Hirschfelder (5 adult, 6 subadult).
 Etymology: The new species is named after the type locality Kastalia Spring in Delphi.
 Description:
 Shell: The shell is ovate cylindrical with a small and flat apex. The 4.5-5 whorls are convex with a deep suture. The body whorl takes about 0.7 of shell height. The aperture is ovate and slightly angled at the top. The peristome is sharp, somewhat thickened at the columella. The umbilicus is closed. The shell is 2.5- 2.8 mm high and 1.6-1.7 mm broad.
 Differentiating characters: The length to width ratio of the new species (1.65) is between the higher and more slender B. charpentieri (Roth, 1855) from Attica (2.2) and B. eleousae n. sp. from northern Parnassus Mountains (<1.55).
 Distribution: Only known from type locality in Delphi.
description: Published as part of Glöer, Peter & Hirschfelder, Hans-Jürgen, 2020, Some new Bythinella spp. from southern Greece (Gastropoda: Bythinellidae), pp. 60-67 in Ecologica Montenegrina 30 on page 63, DOI: 10.37828/em.2020.30.5, http://zenodo.org/record/13231395
The three-loop anomalous dimension and the four-loop $β$-function for ${\cal N}=1$ SQED regularized by higher derivatives
Creators: name: Shirokov, Ilya
name: Stepanyantz, Konstantin
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For ${\cal N}=1$ SQED with $N_f$ flavors regularized by higher derivatives in the general $ξ$-gauge we calculate the three-loop anomalous dimension of the matter superfields defined in terms of the bare coupling constant and demonstrate its gauge independence. After this the four-loop $β$-function defined in terms of the bare coupling constant is obtained with the help of the NSVZ equation, which is valid for these renormalization group functions in all loops. Next, we calculate the three-loop anomalous dimension and the four-loop $β$-function defined in terms of the renormalized coupling constant for an arbitrary subtraction scheme supplementing the higher derivative regularization. Then we construct a renormalization prescription for which the results coincide with the ones in the $\overline{\mbox{DR}}$-scheme and describe all NSVZ schemes in the considered approximation. Also we demonstrate the existence of a subtraction scheme in which the anomalous dimension does not depend on $N_f$, while the $β$-function contains only terms of the first order in $N_f$. This scheme is obtained with the help of a finite renormalization compatible with a structure of quantum corrections and is NSVZ. The existence of such an NSVZ scheme is also proved in all loops.
description: 29 pages
Observing Axion Emission from Supernova with Collider Detectors
Creators: name: Asai, Shoji
name: Kanazawa, Yoshiki
name: Moroi, Takeo
name: Sichanugrist, Thanaporn
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider a possibility to observe the axion emission from a nearby supernova (SN) in the future, which can be known in advance by the pre-SN alert system, by collider detectors like the LHC detectors (i.e., the ATLAS and the CMS) and the ILC detectors (i.e., the ILD and SiD). The axion from the SN can be converted to the photon by the strong magnetic field in the detector and the photon can be detected by electromagnetic calorimeter. We estimate the numbers of signal and background events due to a nearby SN and show that the number of signal may be sizable. The axion emission from a nearby SN may be observed if, at the time of the SN, the beam is stopped and the detector operation is switched to the one for the SN axion search.
description: 21 pages, 4 figures, 2 tables; v2: corrected typos, added footnote about signal & background time curve, emphasized the result, conclusions unchanged
НОВЫЕ АДАПТАЦИОННЫЕ АЛГОРИТМЫ ДИАГНОСТИКИ КВАЗИПЕРИОДИЧЕСКИХ ИМПУЛЬСНЫХ СИСТЕМ
Creators: name: Балакин Д. А.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: циклическая система
квазипериодическая система
преобразование Эрмита
функции Гаусса — Эрмита
вейлет-преобразование
адаптационные алгоритмы

description: В машиностроительной отрасли стоит актуальная задача не только осуществить диагностику циклических систем (газотурбинные двигатели, турбогенераторы, двигатели самолетов, вращение винта вертолета), когда дефект уже возник, но дать прогноз, о том, как система поведет себя в будущем. Таким образом, обнаружить неисправность на ранней стадии развития, что не только продлит срок службы изделия, но и спасет жизнь человеку. В статье представлены базовые принципы построения новых эффективных алгоритмов диагностики циклических систем. Рассмотрен пример обработки записей вибросигнала подшипников трансмиссии газотурбинного двигателя. Представлена блок-схема одного из алгоритмов, позволяющего оценить квазипериодичность исследуемой системы. В заключение статьи рассматриваются пути практической реализации алгоритмов.
СПОСОБ ОБРАБОТКИ СВАРНЫХ СОЕДИНЕНИЙ И ИНСТРУМЕНТ ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯ
Creators: name: Крамской А. В.
name: Людмирский Ю. Г.
name: Котлышев Р. Р.
name: Солтовец М. В.
name: Жидков М. Е.
name: Усенко М. И.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: сварные соединения
усталостная прочность
ротационная термопластическая обработка
сверхпластичность
вращающийся инструмент
распределение теплоты
компьютерная модель
упругопластические деформации
алюминиевые сплавы

description: Рассмотрены факторы, снижающие усталостную прочность сварных соединений. Разработана технология ротационной термопластической обработки для повышения усталостной прочности сварных соединений. Выявлена закономерность распределения теплоты и разработана модель, использующая МКЭ, распределения упругопластических деформаций при воздействии вращающегося инструмента на сварное соединение. Определено, что предложенная технология обеспечивает повышение усталостной прочности сварных соединений алюминиевых сплавов до 39 %.
Murmurations of elliptic curves
Creators: name: He, Yang-Hui
name: Lee, Kyu-Hwan
name: Oliver, Thomas
name: Pozdnyakov, Alexey
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: High Energy Physics - Theory (hep-th)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We investigate the average value of the Frobenius trace at p over elliptic curves in a fixed conductor range with given rank. Plotting this average as p varies over the primes yields a striking oscillating pattern, the details of which vary with the rank. Based on this observation, we perform various data-scientific experiments with the goal of classifying elliptic curves according to their ranks.
description: 27 pages, 16 figures, 2 tables
ИННОВАЦИОННАЯ КОНСТРУКЦИЯ ВАГОНА-ПЛАТФОРМЫ ДЛЯ КОНТРЕЙЛЕРНО- КОНТЕЙНЕРНЫХ ПЕРЕВОЗОК
Creators: name: Ашуркова С. Н.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: вагон-платформа
контрейлерные перевозки
контейнерные перевозки
компьютерное моделирование
прочность
динамика
усталостная долговечность

description: В работе предложена оригинальная конструкция вагона-платформы для контрейлерно-контейнерных перевозок с пониженным полом на длине базы, отличающаяся от ранее спроектированных платформ укороченной хребтовой балкой, новым профилем боковых продольных балок, установкой раскосов и оригинальной конструкцией фитинговых упоров. Оценка правильности выбора параметров несущей конструкции платформы подтверждена удовлетворительными результатами расчета рамы на прочность по регламентированным расчетным нагрузкам и расчетным режимам, также оценена усталостная долговечность конструкции в динамической постановке методами компьютерного моделирования
Single $π^0$ production in $μe$ scattering at MUonE
Creators: name: Budassi, E.
name: Calame, C. M. Carloni
name: Del Pio, C. L.
name: Piccinini, F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The recently proposed MUonE experiment at CERN aims at providing a novel determination of the leading order hadronic contribution to the muon anomalous magnetic moment through the study of elastic muon-electron scattering at relatively small momentum transfer. The anticipated accuracy of the order of 10ppm demands for high-precision prediction in radiative corrections to the $μe$ scattering as well as for robust quantitative estimates of all possible background processes. In this letter, the contribution due to the emission of a neutral pion through the process $μe \to μe π^0$ is studied and its numerical impact is discussed in different phase space configurations by means of the upgraded Monte Carlo event generator MESMER. In fact, single $π^0$ production could be a source of reducible background for the measurement of the QED running coupling constant at MUonE and it could be also an important background for possible New Physics searches at MUonE involving $2 \to 3$ processes, in phase space regions complementary to the ones characteristic of the elastic $μe$ scattering.
description: 9 pages, 11 figures
On a wider class of prior distributions for graphical models
Creators: name: Natarajan, Abhinav
name: Boom, Willem van den
name: Odang, Kristoforus Bryant
name: De Iorio, Maria
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 62H22 (Primary) 05C80, 05C90 (Secondary)

description: Gaussian graphical models are useful tools for conditional independence structure inference of multivariate random variables. Unfortunately, Bayesian inference of latent graph structures is challenging due to exponential growth of $\mathcal{G}_n$, the set of all graphs in $n$ vertices. One approach that has been proposed to tackle this problem is to limit search to subsets of $\mathcal{G}_n$. In this paper, we study subsets that are vector subspaces with the cycle space $\mathcal{C}_n$ as main example. We propose a novel prior on $\mathcal{C}_n$ based on linear combinations of cycle basis elements and present its theoretical properties. Using this prior, we implement a Markov chain Monte Carlo algorithm, and show that (i) posterior edge inclusion estimates computed with our technique are comparable to estimates from the standard technique despite searching a smaller graph space, and (ii) the vector space perspective enables straightforward implementation of MCMC algorithms.
description: 37 pages, 8 figures
Around the Spindle galaxy: the dark halo mass of NGC3115
Creators: name: Karachentsev, I. D.
name: Makarova, L. N.
name: Anand, G. S.
name: Tully, R. B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report observations of five dwarf galaxies in the vicinity of the luminous S0 galaxy NGC 3115 performed with the Advanced Camera for Surveys on the Hubble Space Telescope. Their distances determined via the Tip of the Red Giant Branch are: 10.05 Mpc (UGCA 193), 9.95 Mpc (KKSG 17), 10.13 Mpc (2MASX-J0957-0915), 10.42 Mpc (2dFGRS-TGN218Z179) and 11.01 Mpc (KKSG 19). With their typical distance error of about 0.75 Mpc all the five dwarfs are consistent to be true satellites of the host galaxy NGC 3115 (10.2$\pm$0.2 Mpc). Using the DESI Legacy Imaging Surveys we also found 5 new probable dwarf satellites of NGC3115, as well as 4 new probable members of the neighboring group around NGC 3521 situated 3 Mpc away from the NGC 3115 group. Based on the radial velocities and projected separations of 10 dwarf companions, we derived the total (orbital) mass of NGC 3115 to be (4.89$\pm$1.48) $10^{12}$ $M_{\odot}$. The ratio of the total mass-to-K-luminosity of NGC 3115 is (50$\pm$15) $M_\odot/L_\odot$, which is typical for the early-type luminous galaxies.
description: 20 pages, 5 figures, accepted in AJ
Impact of a competency based curriculum on quality improvement among internal medicine residents
Creators: name: Fok, Mark C
name: Wong, Roger Y
Publisher: name: BioMed Central
Year: 2015

description: Background: Teaching quality improvement (QI) principles during residency is an important component of promoting patient safety and improving quality of care. The literature on QI curricula for internal medicine residents is limited. We sought to evaluate the impact of a competency based curriculum on QI among internal medicine residents. Methods This was a prospective, cohort study over four years (2007–2011) using pre-post curriculum comparison design in an internal medicine residency program in Canada. Overall 175 post-graduate year one internal medicine residents participated. A two-phase, competency based curriculum on QI was developed with didactic workshops and longitudinal, team-based QI projects. The main outcome measures included self-assessment, objective assessment using the Quality Improvement Knowledge Assessment Tool (QIKAT) scores to assess QI knowledge, and performance-based assessment via presentation of longitudinal QI projects. Results Overall 175 residents participated, with a response rate of 160/175 (91%) post-curriculum and 114/175 (65%) after conducting their longitudinal QI project. Residents’ self-reported confidence in making changes to improve health increased and was sustained at twelve months post-curriculum. Self-assessment scores of QI skills improved significantly from pre-curriculum (53.4 to 69.2 percent post-curriculum [p-value 0.002]) and scores were sustained at twelve months after conducting their longitudinal QI projects (53.4 to 72.2 percent [p-value 0.005]). Objective scores using the QIKAT increased post-curriculum from 8.3 to 10.1 out of 15 (p-value for difference <0.001) and this change was sustained at twelve months post-project with average individual scores of 10.7 out of 15 (p-value for difference from pre-curriculum <0.001). Performance-based assessment occurred via presentation of all projects at the annual QI Project Podium Presentation Day. Conclusion The competency based curriculum on QI improved residents’ QI knowledge and skills during residency training. Importantly, residents perceived that their QI knowledge improved after the curriculum and this also correlated to improved QIKAT scores. Experiential QI project work appeared to contribute to sustaining QI knowledge at twelve months.
Genes related to emphysema are enriched for ubiquitination pathways
Creators: name: Stepaniants, Sergey
name: Wang, I-Ming
name: Boie, Yves
name: Mortimer, James
name: Kennedy, Brian
name: Elliott, Mark
name: Hayashi, Shizu
name: Luo, Honglin
name: Wong, Jerry
name: Loy, Leanna
name: Coulter, Silvija
name: Roberts, Christopher J.
name: Hogg, James C.
name: Sin, Don D.
name: O’Neill, Gary
name: Crackower, Michael
name: Morris, Melody
name: Paré, Peter D.
name: Obeidat, Ma’en
Publisher: name: BioMed Central
Year: 2015

description: Background: Increased small airway resistance and decreased lung elasticity contribute to the airflow limitation in chronic obstructive pulmonary disease (COPD). The lesion that corresponds to loss of lung elasticity is emphysema; the small airway obstruction is due to inflammatory narrowing and obliteration. Despite their convergence in altered physiology, different mechanisms contribute to these processes. The relationships between gene expression and these specific phenotypes may be more revealing than comparison with lung function. Methods We measured the ratio of alveolar surface area to lung volume (SA/V) in lung tissue from 43 smokers. Two samples from 21 subjects, in which SA/V differed by >49 cm2/mL were profiled to select genes whose expression correlated with SA/V. Significant genes were tested for replication in the 22 remaining subjects. Results The level of expression of 181 transcripts was related to SA/V ( p < 0.05). When these genes were tested in the 22 remaining subjects as a replication, thirty of the 181 genes remained significantly associated with SA/V (P < 0.05) and the direction of association was the same in 164/181. Pathway and network analysis revealed enrichment of genes involved in protein ubiquitination, and western blotting showed altered expression of genes involved in protein ubiquitination in obstructed individuals. Conclusion This study implicates modified protein ubiquitination and degradation as a potentially important pathway in the pathogenesis of emphysema.
ЗАТЕКАНИЕ ВНЕШНЕГО ТЕЧЕНИЯ В СООРУЖЕНИЕ В ПРОГРАММНОМ КОМПЛЕКСЕ ANSYS FLUENT
Creators: name: Сенникова А. Г.
Publisher: name: Союз машиностроителей России. Национальная научно-техническая конференция
Year: 2020
Subjects: сооружение
газодинамические течения
Fluent
Ansys
Workbench
валидация
сеточная сходимость

description: Рассмотрен процесс затекания внешнего течения в сооружение в программном комплексе ANSYS Fluent. Приведены поля температуры и скорости воздуха при воздействии внешнего течения на сооружение. Задача обеспечения выхода изделия в период действия течений воздуха является актуальной. Затекание этих течений в сооружение в момент открывания крыши и выхода изделия, когда последнее практически не защищено, может привести к появлению повышенных тепловых и силовых нагрузок на элементы сооружения, нарушению нормального функционирования аппаратуры. В настоящее время существует возможность полноценного теоретического исследования подобных процессов. Анализ и расчеты показывают, что процесс затекания является нестационарным, неустойчивым и сопровождается образованием вихревых структур. Полученные в работе результаты могут быть использованы в проектных и эксплуатационных организациях при проектировании и модернизации сооружений.
Overcoming Work Obstacles for Nurses While Caring for Persons with COVID-19.: A Qualitative Study
Creators: name: Imkome, Ekuma
name: Soonthornchaiya, Rangsiman
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420504
subject: Mental health nursing

description: Overcoming Work Obstacles for Nurses While Caring for Persons with COVID-19, this qualitative study was conducted during the COVID-19 pandemic to explore nurses' experiences. The findings will help design nursing interventions and support nursing law and policy to promote people's health and well-being.
Experiences of Caring Persons with COVID-19: A Qualitative Study in Thailand
Creators: name: Imkome, Ekuma
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 420504
subject: Mental health nursing

description: Experiences of Caring Persons with COVID-19: A Qualitative Study in Thailand. This study was conducted during the COVID-19 pandemic to explore nurses' experiences. The findings will help design nursing interventions and support nursing law and nursing policy to protect the community's and people's rights.
Spitzer and Herschel studies of dust in supernova remnants in the Small Magellanic Cloud
Creators: name: Matsuura, Mikako
name: Ayley, Victoria
name: Chawner, Hannah
name: Filipovic, M. D.
name: Reid, Warren
name: Priestley, F. D.
name: Rigby, Andy
name: Barlow, M. J.
name: Gomez, Haley E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: With the entire Small Magellanic Cloud (SMC) mapped by the Spitzer Space Telescope and Herschel Space Observatory, we were able to search 8-250 micron images in order to identify infrared (IR) emission associated with SMC supernova remnants (SNRs). A valid detection had to correspond with known X-ray, Halpha and radio emission from the SNRs. From the 24 known SNRs, we made 5 positive detections with another 5 possible detections. Two detections are associated with pulsars or pulsar wind nebula, and another three detections are part of the extended nebulous emission from the SNRs. We modelled dust emission where fast moving electrons are predicted to collide and heat dust grains which then radiate in IR. With known distance (62.44+-0.47kpc), measured SNR sizes, electron densities, temperatures from X-ray emission as well as hydrogen densities, the modelling of SMC SNRs is straightforward. If the higher range of hydrogen and electron densities were to be accepted, we would expect almost all SMC SNRs to be detected in the IR, at least at 24 micron, but the actual detection rate is only 25%. One possible and common explanation for this discrepancy is that small grains have been destroyed by the SNRs shockwave. However, within the uncertainties of hydrogen and electron densities, we find that infrared dust emission can be explained reasonably well, without invoking dust destruction. There is no conclusive evidence that SNRs destroy swept-up ISM dust.
description: accepted for publication in MNRAS; 33 pages
An information-theoretic approach to hypergraph psychometrics
Creators: name: Marinazzo, Daniele
name: Van Roozendaal, Jan
name: Rosas, Fernando E.
name: Stella, Massimo
name: Comolatti, Renzo
name: Colenbier, Nigel
name: Stramaglia, Sebastiano
name: Rosseel, Yves
Publisher: name: arXiv
Year: 2022
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Psychological network approaches propose to see symptoms or questionnaire items as interconnected nodes, with links between them reflecting pairwise statistical dependencies evaluated cross-sectional, time-series, or panel data. These networks constitute an established methodology to assess the interactions and relative importance of nodes/indicators, providing an important complement to other approaches such as factor analysis. However, focusing the modelling solely on pairwise relationships can neglect potentially critical information shared by groups of three or more variables in the form of higher-order interdependencies. To overcome this important limitation, here we propose an information-theoretic framework based on hypergraphs as psychometric models. As edges in hypergraphs are capable of encompassing several nodes together, this extension can thus provide a richer representation of the interactions that may exist among sets of psychological variables. Our results show how psychometric hypergraphs can highlight meaningful redundant and synergistic interactions on either simulated or state-of-art, re-analyzed psychometric datasets. Overall, our framework extends current network approaches while leading to new ways of assessing the data that differ at their core from other methods, extending the psychometric toolbox and opening promising avenues for future investigation.
ORGANIZATIONAL AND ECONOMIC MECHANISM FOR ENSURING THE DEVELOPMENT OF THE NATIONAL ECONOMY IN THE POST-WAR PERIOD
Creators: name: Matviievskyi Nazar
Publisher: name: Zenodo
Year: 2025
Subjects: post-war development, organizational and economic mechanism, smart governance, public-private partnership, human capital, economic recovery

description: The article offers a comprehensive theoretical and methodological reflection on the organizational and economic mechanism as a key instrument for ensuring the development of Ukraine's national economy in the post-war period. The study is based on a critical analysis of contemporary academic literature, economic policy practices, and interdisciplinary approaches to post-crisis reconstruction. It is established that a modern organizational and economic mechanism should not function as a hierarchical system of regulation but rather as a flexible, adaptive, and polycentric structure combining institutional, financial, managerial, and socio-humanitarian components.

Special attention is given to the role of the state in coordinating recovery mechanisms through the paradigm of smart governance, which involves a shift from direct intervention to facilitation of partnerships, transparency, and digital accountability. At the same time, the article proves that effective recovery depends not only on normative or financial instruments but also on the ability to engage the private sector in the long-term co-creation of economic space and on the deep mobilization of human capital as a source of innovation, social cohesion, and professional adaptability. The article proposes a structural model of the organizational and economic mechanism, presenting it as a multidimensional system of interactions aimed at achieving sustainable, innovative, and inclusive development.

The functional roles of the state in the post-war economy are systematized, the conditions for effective public-private partnerships are outlined, and the potential of European integration is analyzed not only as a source of financial assistance but also as a driver of regulatory modernization. The study concludes that recovery should not be perceived as a return to the pre-war “normal,” but as a complex and responsible process of designing a new economic reality grounded in the synthesis of national identity, strategic vision, and institutional maturity.
Thermal Relaxation of Dark Matter Admixed Neutron Star
Creators: name: Kumar, Ankit
name: Das, H. C.
name: Patra, S. K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Motivated by the various theoretical studies regarding the efficient capturing of dark matter by neutron stars, we explore the possible indirect effects of captured dark matter on the cooling mechanism of a neutron star. The equation of states for different configurations of dark matter admixed star at finite temperature is obtained using the relativistic mean-field formalism with the IOPB-I parameter set. We show that the variation in the dark matter momentum vastly modifies the neutrino emissivity through specific neutrino generating processes of the star. The specific heat and the thermal conductivity of a dark matter admixed star have also been investigated to explore the propagation of cooling waves in the interior of the star. The dependence of theoretical surface temperature cooling curves on the equation of state and chemical composition of the stellar matter has also been discussed along with the observational data of thermal radiation from various sources. We observed that the dark matter admixed canonical stars with $k_{f}^{\rm DM} > 0.04$ comply with the fast cooling scenario. Further, the metric for internal thermal relaxation epoch has also been calculated with different dark matter momentum and we deduced that increment of dark matter segment amplify the cooling and internal relaxation rates of the star.
description: 14 pages, 11 figures. Published in MNRAS
Bending the rules of low-temperature thermometry with periodic driving
Creators: name: Glatthard, Jonas
name: Correa, Luis A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: There exist severe limitations on the accuracy of low-temperature thermometry, which poses a major challenge for future quantum-technological applications. Low-temperature sensitivity might be manipulated by tailoring the interactions between probe and sample. Unfortunately, the tunability of these interactions is usually very restricted. Here, we focus on a more practical solution to boost thermometric precision -- driving the probe. Specifically, we solve for the limit cycle of a periodically modulated linear probe in an equilibrium sample. We treat the probe-sample interactions \textit{exactly} and hence, our results are valid for arbitrarily low temperatures $ T $ and any spectral density. We find that weak near-resonant modulation strongly enhances the signal-to-noise ratio of low-temperature measurements, while causing minimal back action on the sample. Furthermore, we show that near-resonant driving changes the power law that governs thermal sensitivity over a broad range of temperatures, thus `bending' the fundamental precision limits and enabling more sensitive low-temperature thermometry. We then focus on a concrete example -- impurity thermometry in an atomic condensate. We demonstrate that periodic driving allows for a sensitivity improvement of several orders of magnitude in sub-nanokelvin temperature estimates drawn from the density profile of the impurity atoms. We thus provide a feasible upgrade that can be easily integrated into low-$T$ thermometry experiments.
description: 9 + 6 pages, 3 figures, accepted version