cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Recovering galaxy stellar population properties from broad-band spectral energy distribution fitting II. The case with unknown redshift
Creators: name: Pforr, Janine
name: Maraston, Claudia
name: Tonini, Chiara
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: (Abridged) In a recent work we explored the dependence of galaxy stellar population properties derived from broad-band spectral energy distribution fitting on the fitting parameters, e.g. SFHs, age grid, metallicity, IMF, dust reddening, reddening law, filter setup and wavelength coverage. In this paper we consider also redshift as a free parameter in the fit and study whether one can obtain reasonable estimates of photometric redshifts and stellar population properties at once. We use mock star-forming as well as passive galaxies placed at various redshifts (0.5 to 3) as test particles. Mock star-forming galaxies are extracted from a semi-analytical galaxy formation model. We show that for high-z star-forming galaxies photometric redshifts, stellar masses and reddening can be determined simultaneously when using a broad wavelength coverage and a wide template setup in the fit. Masses are similarly well recovered (median ~ 0.2 dex) as at fixed redshift. For old galaxies with little recent star formation masses are better recovered than in the fixed redshift case, such that the median recovered stellar mass improves by up to 0.3 dex whereas the uncertainty in the redshift accuracy increases by only ~ 0.05. However, a failure in redshift recovery also means a failure in mass recovery. As at fixed redshift mismatches in SFH and degeneracies between age, dust and now also redshift cause underestimated ages, overestimated reddening and underestimated masses. Stellar masses are best determined at low redshift without reddening in the fit (median underestimation ~ 0.1 dex for similarly well recovered redshifts). Not surprisingly, the recovery of properties is substantially better for passive galaxies. In all cases, the recovery of physical parameters is crucially dependent on the wavelength coverage adopted in the fitting. Scaling relations for the transformation of stellar masses are provided.
description: 44 pages including appendices, 35 figures, 9 tables, accepted for publication in MNRAS
Implementasi Peningkatan Profesionalisme Guru PAUD melalui Diklat Berjenjang
Creators: name: Miftakhi, Diah Rina
name: Pramusinto, Hengki
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Tiered education and training are a program of education and training activities carried out in stages. The target of this training activity is PAUD teachers who have not participated in tiered training activities. This study aims to improve teachers' teaching ability through training activities, namely tiered training. This training activity is carried out in stages. Participants are declared to have passed at each stage if they have carried out all training activities and submitted independent assignments to the education and training organizers. This study uses a qualitative descriptive method. The primary data source for this study was 60 PAUD teachers in Kepulauan Bangka Belitung Province. The secondary data sources of this research are the results of the independent assignments of each participant, policies related to the implementation of tiered training activities, and research journal articles. The results of this study indicate that the following tiered training can run effectively with excellent results and can improve teachers' teaching abilities.
description: Full Text in Indonesian
Analysis of Teachers Management Policy: A Case Study of South Bangka, Indonesia
Creators: name: Rahadian, Raditya Bayu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Teachers are the spearhead of improving the quality of education. The law clearly describes the duties and professional functions of teachers along with the standard qualifications that must be met. The division of education affairs between the Central Government and Regional Governments should facilitate teacher management. But the management of teachers is still a classic problem that has not been resolved. Data regarding the attainment of teacher professional competence shows that teacher capability is still far from expectations. Adequate provision of teacher capabilities is a very urgent matter for the government to carry out if it wants teachers to be able to carry out their duties and functions correctly according to what has been mandated by law. This paper will present the problems faced by the government, especially local governments in teacher management. Next, it presents an analysis of a series of teacher management policies carried out by the local government which in this paper takes the case in South Bangka Regency, Bangka Belitung Islands Province.
description: 5 pages
On the absolute value of the air-fluorescence yield
Creators: name: Rosado, J.
name: Blanco, F.
name: Arqueros, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The absolute value of the air-fluorescence yield is a key parameter for the energy reconstruction of extensive air showers registered by fluorescence telescopes. In previous publications, we reported a detailed Monte Carlo simulation of the air-fluorescence generation that allowed the theoretical evaluation of this parameter. This simulation has been upgraded in the present work. As a result, we determined an updated absolute value of the fluorescence yield of 7.9+-2.0 ph/MeV for the band at 337 nm in dry air at 800 hPa and 293 K, in agreement with experimental values. We have also performed a critical analysis of available absolute measurements of the fluorescence yield with the assistance of our simulation. Corrections have been applied to some measurements to account for a bias in the evaluation of the energy deposition. Possible effects of other experimental aspects have also been discussed. From this analysis, we determined an average fluorescence yield of 7.04+-0.24 ph/MeV at the above conditions.
description: Submitted to Astroparticle Physics
201in Competency Table
Creators: name: Succar, Bilal
Publisher: name: Zenodo
Year: 2019
Subjects: subject: https://bimdictionary.com/en/competency/1/

description: The Competency Table organises Competency Items and provide a structure for:

	Developing assessment modules for evaluating and comparing the abilities of individuals, groups and whole organisations.
	Developing competency-based certification regimes and accreditation programmes.
	Developing learning units and competency-based educational programmes.
	Identifying competency profiles of varied roles across markets and disciplines.
description: {"references": ["Succar, B., Sher, W., & Williams, A. (2013). An integrated approach to BIM competency acquisition, assessment and application. Automation in Construction, doi: http://dx.doi.org/10.1016/j.autcon.2013.05.016"]}
The Hubble Diagram: Jump from Supernovae to Gamma-Ray Bursts
Creators: name: Lovyagin, Nikita
name: Gainutdinov, Rustam
name: Shirokov, Stanislav
name: Gorokhov, Vladimir
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: 85-05

description: The Hubble diagram (HD) is a plot that contains luminous distance modulus presented with respect to the redshift. The distance modulus--redshift relation of the most well-known ``standard candles'', the type Ia supernovae (SN), is a crucial tool in cosmological model testing. In this work, we use the SN Ia data from the Pantheon catalogue to calibrate the Swift long gamma-ray bursts (LGRBs) as ``standard candles'' via the Amati relation. Thus, we expand the HD from supernovae to the area of the Swift LGRBs up to $z\sim8$. To improve the quality of estimation of the parameters and their errors, we implement the Monte-Carlo uncertainty propagation method. We also compare the results of estimation of the Amati parameters calibrated by the SN Ia, and by the standard $Λ$CDM model and find no statistically significant distinguish between them. Although the size of our LGRB sample is relatively small and the errors are high, we find this approach of expanding the cosmological distance scale perspective for future cosmological tests.
description: 12 pages, 6 figures
Measuring galaxy [OII] emission line doublet with future ground-based wide-field spectroscopic surveys
Creators: name: Comparat, Johan
name: Kneib, Jean-Paul
name: Bacon, Roland
name: Mostek, Nick J.
name: Newman, Jeffrey A.
name: Schlegel, David J.
name: Yèche, Christophe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The next generation of wide-field spectroscopic redshift surveys will map the large-scale galaxy distribution in the redshift range 0.7< z<2 to measure baryonic acoustic oscillations (BAO). The primary optical signature used in this redshift range comes from the [OII] emission line doublet, which provides a unique redshift identification that can minimize confusion with other single emission lines. To derive the required spectrograph resolution for these redshift surveys, we simulate observations of the [OII] (3727,3729) doublet for various instrument resolutions, and line velocities. We foresee two strategies about the choice of the resolution for future spectrographs for BAO surveys. For bright [OII] emitter surveys ([OII] flux ~30.10^{-17} erg /cm2/s like SDSS-IV/eBOSS), a resolution of R~3300 allows the separation of 90 percent of the doublets. The impact of the sky lines on the completeness in redshift is less than 6 percent. For faint [OII] emitter surveys ([OII] flux ~10.10^{-17} erg /cm2/s like DESi), the detection improves continuously with resolution, so we recommend the highest possible resolution, the limit being given by the number of pixels (4k by 4k) on the detector and the number of spectroscopic channels (2 or 3).
description: 5 pages, 1 figure
Optical spectropolarimetry of V4332 Sagittarii
Creators: name: Kamiński, T.
name: Tylenda, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The eruption of V4332 Sgr was observed in 1994. During the outburst, the object became extremely red, so it has been considered as to belong to red transients of the V838 Mon type. Optical spectroscopy obtained a few years after the eruption showed a faint M-type stellar spectrum underlying numerous molecular and atomic emission features. It has recently been suggested that the central object in V4332 Sgr is now hidden in a dusty disc and that the photospheric spectrum of this object observed in the optical results from scattering of the radiation of the central star on dust grains in the circumstellar matter. Recent polarimetric photometry has shown that the optical radiation of the object is indeed strongly polarized. We present and analyse our spectropolarimetric observations of V4332 Sgr obtained with the VLT in the optical region. The optical continuum of V4332 Sgr is linearly polarized with a typical degree of 16.6%. A clear depolarization is observed in the spectral regions where emission features contribute significantly to the observed flux. The only prominent exception is the CaI 6573 emission line, which is polarized in 21%. The results of our spectropolarimetric observations are in accord with the proposed geometry of the system and the advocated nature of the observed optical spectrum of V4332 Sgr. The continuum is not seen directly but results from scattering on dust within the disc and polar outflow, while most of the gas emission comes from the polar outflow excited by the radiation field of the central source. Additionally, the observed polarization patterns suggest a stratification of the outflow.
description: accepted for publication in Astronomy & Astrophysics
NODLINK: An Online System for Fine-Grained APT Attack Detection and Investigation
Creators: name: Li, Shaofei
name: Dong, Feng
name: Xiao, Xusheng
name: Wang, Haoyu
name: Shao, Fei
name: Chen, Jiedong
name: Guo, Yao
name: Chen, Xiangqun
name: Li, Ding
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Advanced Persistent Threats (APT) attacks have plagued modern enterprises, causing significant financial losses. To counter these attacks, researchers propose techniques that capture the complex and stealthy scenarios of APT attacks by using provenance graphs to model system entities and their dependencies. Particularly, to accelerate attack detection and reduce financial losses, online provenance-based detection systems that detect and investigate APT attacks under the constraints of timeliness and limited resources are in dire need. Unfortunately, existing online systems usually sacrifice detection granularity to reduce computational complexity and produce provenance graphs with more than 100,000 nodes, posing challenges for security admins to interpret the detection results. In this paper, we design and implement NodLink, the first online detection system that maintains high detection accuracy without sacrificing detection granularity. Our insight is that the APT attack detection process in online provenance-based detection systems can be modeled as a Steiner Tree Problem (STP), which has efficient online approximation algorithms that recover concise attack-related provenance graphs with a theoretically bounded error. To utilize STP approximation algorithm frameworks for APT attack detection, we propose a novel design of in-memory cache, an efficient attack screening method, and a new STP approximation algorithm that is more efficient than the conventional one in APT attack detection while maintaining the same complexity. We evaluate NodLink in a production environment. The open-world experiment shows that NodLink outperforms two state-of-the-art (SOTA) online provenance analysis systems by achieving magnitudes higher detection and investigation accuracy while having the same or higher throughput.
description: The final version of this paper is going to appear in the Conference on Network and Distributed System Security Symposium (NDSS'24), 26 Feb - 1 Mar 2024, San Diego, California
Affordable Artificial Intelligence -- Augmenting Farmer Knowledge with AI
Creators: name: Kumar, Peeyush
name: Nelson, Andrew
name: Kapetanovic, Zerina
name: Chandra, Ranveer
Publisher: name: arXiv
Year: 2023
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Farms produce hundreds of thousands of data points on the ground daily. Farming technique which combines farming practices with the insights uncovered in these data points using AI technology is called precision farming. Precision farming technology augments and extends farmers' deep knowledge about their land, making production more sustainable and profitable. As part of the larger effort at Microsoft for empowering agricultural labor force to be more productive and sustainable, this paper presents the AI technology for predicting micro-climate conditions on the farm. This article is a chapter in publication by Food and Agriculture Organization of the United Nations and International Telecommunication Union Bangkok, 2021. This publication on artificial intelligence (AI) for agriculture is the fifth in the E-agriculture in Action series, launched in 2016 and jointly produced by FAO and ITU. It aims to raise awareness about existing AI applications in agriculture and to inspire stakeholders to develop and replicate the new ones. Improvement of capacity and tools for capturing and processing data and substantial advances in the field of machine learning open new horizons for data-driven solutions that can support decision-making, facilitate supervision and monitoring, improve the timeliness and effectiveness of safety measures (e.g. use of pesticides), and support automation of many resource-consuming tasks in agriculture. This publication presents the reader with a collection of informative applications highlighting various ways AI is used in agriculture and offering valuable insights on the implementation process, success factors, and lessons learnt.
description: Digital agriculture in action- Artificial Intelligence for agriculture. Bangkok, FAO and ITU, 2021
New developments for modern celestial mechanics. I. General coplanar three-body systems. Application to exoplanets
Creators: name: Mardling, Rosemary A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Modern applications of celestial mechanics include the study of closely packed systems of exoplanets, circumbinary planetary systems, binary-binary interactions in star clusters, and the dynamics of stars near the galactic centre. While developments have historically been guided by the architecture of the Solar System, the need for more general formulations with as few restrictions on the parameters as possible is obvious. Here we present clear and concise generalisations of two classic expansions of the three-body disturbing function, simplifying considerably their original form and making them accessible to the non-specialist. Governing the interaction between the inner and outer orbits of a hierarchical triple, the disturbing function in its general form is the conduit for energy and angular momentum exchange and as such, governs the secular and resonant evolution of the system and its stability characteristics. Focusing here on coplanar systems, the first expansion is one in the ratio of inner to outer semimajor axes and is valid for all eccentricities, while the second is an expansion in eccentricity and is valid for all semimajor axis ratios [...]. Our generalizations make both formulations valid for arbitrary mass ratios. [...]. We demonstrate the equivalence of the new expansions, identifying the role of the spherical harmonic order m in both and its physical significance in the three-body problem, and introducing the concept of principal resonances. Several examples of the accessibility of both expansions are given including resonance widths and the secular rates of change of the elements. Results in their final form are gathered together at the end of the paper for the reader mainly interested in their application, including a guide for the choice of expansion.
description: 45 pages, 12 figures, 3 tables, accepted for publication in MNRAS
Map of the geology of the Northern Caribbean and the Greater Antillean Arc
Creators: name: Steel, Ian
name: Davison, Ian
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Appendix: The surface geology in the map was based on many sources, and a full listing is given in this appendix.
ETHIOPIAN RAILWAY CORPORATION AS A MULTIMODAL OPERATOR
Creators: name: Kidist Hailu
Publisher: name: Zenodo
Year: 2015

description: Multimodal freight transport can facilitate the economic development of Operators. The Study shows particularly in fright transportation, there is developing the single mode of transport in to multimodal operation system, the characteristics of multimodal travel today in Ethiopia and assesses its future potential in Railway Corporation, the factors required to implement the multimodal operating system and make Railway will be competitive rather than shipping line.
Probing the wavefunction of the surface states in Bi$_2$Se$_3$ topological insulator: a realistic tight-binding approach
Creators: name: Pertsova, A.
name: Canali, C. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on microscopic tight-binding modeling of surface states in Bi$_2$Se$_3$ three-dimensional topological insulator, based on a sp$^3$ Slater-Koster Hamiltonian, with parameters calculated from density functional theory. The effect of spin-orbit interaction on the electronic structure of the bulk and of a slab with finite thickness is investigated. In particular, a phenomenological criterion of band inversion is formulated for both bulk and slab, based on the calculated atomic- and orbital-projections of the wavefunctions, associated with valence and conduction band extrema at the center of the Brillouin zone. We carry out a thorough analysis of the calculated bandstructures of slabs with varying thickness, where surface states are identified using a quantitative criterion according to their spatial distribution. The thickness-dependent energy gap, attributed to inter-surface interaction, and the emergence of gapless surface states for slabs above a critical thickness are investigated. We map out the transition to the infinite-thickness limit by calculating explicitly the modifications in the spatial distribution and spin-character of the surface states wavefunction with increasing the slab thickness. Our numerical analysis shows that the system must be approximately forty quintuple-layers thick to exhibit completely decoupled surface states, localized on the opposite surfaces. These results have implications on the effect of external perturbations on the surface states near the Dirac point.
description: 11 pages, 11 figures
UTILIZATION OF WASTE ANIMAL BONE AS A HETEROGENEOUS SOLID BASE CATALYST FOR TRANSESTERIFICATION OF JATROPHA OIL
Creators: name: Kaleab Bizuneh
Publisher: name: Zenodo
Year: 2018

description: Heterogeneous catalyst plays a vital role in transesterification process, especially in view of cost

and reusability. In this study, heterogeneous solid base catalyst was prepared by impregnating the

waste animal bone with different weight percent (wt%) KOH solution followed by drying and

calcination at 900 °C for 3 hr. Having screened the catalytic performance and basicity of animal

bone loaded with different K-compounds, 12 wt% KOH loaded on animal bone was chosen. The

physico-chemical properties of animal bone, support and the KOH-impregnated calcined animal

bone catalyst were characterized by means of titration (for basicity of catalyst), Fourier Transform

Infra-Red (FT-IR) spectroscopy and X-Ray Diffraction (XRD) spectroscopy measurements.

Thermogravimetric Analysis (TGA) was also performed for the selected catalyst. Catalytic

performance of the catalyst was evaluated by transesterificating Jatropha oil with methanol in

batch reactions.
Super-Resolution Compressed Sensing: An Iterative Reweighted Algorithm for Joint Parameter Learning and Sparse Signal Recovery
Creators: name: Fang, Jun
name: Li, Jing
name: Shen, Yanning
name: Li, Hongbin
name: Li, Shaoqian
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In many practical applications such as direction-of-arrival (DOA) estimation and line spectral estimation, the sparsifying dictionary is usually characterized by a set of unknown parameters in a continuous domain. To apply the conventional compressed sensing to such applications, the continuous parameter space has to be discretized to a finite set of grid points. Discretization, however, incurs errors and leads to deteriorated recovery performance. To address this issue, we propose an iterative reweighted method which jointly estimates the unknown parameters and the sparse signals. Specifically, the proposed algorithm is developed by iteratively decreasing a surrogate function majorizing a given objective function, which results in a gradual and interweaved iterative process to refine the unknown parameters and the sparse signal. Numerical results show that the algorithm provides superior performance in resolving closely-spaced frequency components.
The basins and the orogens of the Southern Gulf of Mexico map
Creators: name: Steel, Ian
name: Davison, Ian
Publisher: name: Geological Society of London
Year: 2020
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Appendix: The data displayed in the map come from a multitude of sources, and a full list of most of the sources is given in this appendix.
Deformation of the Weighted Scalar Curvature
Creators: name: Ho, Pak Tung
name: Shin, Jinwoo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: Inspired by the work of Fischer-Marsden [Duke Math. J. 42 (1975), 519-547], we study in this paper the deformation of the weighted scalar curvature. By studying the kernel of the formal $L_ϕ^2$-adjoint for the linearization of the weighted scalar curvature, we prove several geometric results. In particular, we define a weighted vacuum static space, and study locally conformally flat weighted vacuum static spaces. We then prove some stability results of the weighted scalar curvature on flat spaces. Finally, we consider the prescribed weighted scalar curvature problem on closed smooth metric measure spaces.
Generation of Pseudo-Random Quantum States on Actual Quantum Processors
Creators: name: Cenedese, Gabriele
name: Bondani, Maria
name: Rosa, Dario
name: Benenti, Giuliano
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The generation of a large amount of entanglement is a necessary condition for a quantum computer to achieve quantum advantage. In this paper, we propose a method to efficiently generate pseudo-random quantum states, for which the degree of multipartite entanglement is nearly maximal. We argue that the method is optimal, and use it to benchmark actual superconducting (IBM's ibm_lagos) and ion trap (IonQ's Harmony) quantum processors. Despite the fact that ibm_lagos has lower single-qubit and two-qubit error rates, the overall performance of Harmony is better thanks to low error rate in state preparation and measurement and to the all-to-all connectivity of qubits. Our result highlights the relevance of the qubits network architecture to generate highly entangled state.
description: 14 pages, 8 figures
Congruence testing for odd subgroups of the modular group
Creators: name: Hamilton, Thomas
name: Loeffler, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 20H05

description: We give a computationally effective criterion for determining whether a finite-index subgroup of SL(2, Z) is a congruence subgroup, extending earlier work of Hsu for subgroups of PSL(2, Z).
Binding energy of a holographic deuteron and tritium in anti-de-Sitter space/conformal field theory (AdS/CFT)
Creators: name: Pahlavani, M. R.
name: Sadeghi, J.
name: Morad, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the large 't Hooft coupling limit, the hadronic size of baryon is small and nucleon-nucleon potential is obtained from massless pseudo-scalar exchanges and an infinite tower of spin one mesons exchanges. In this paper we use the holographic nucleon-nucleon interaction and obtain the corresponding potential and binding energy for deuteron and tritium nuclei. The obtained potentials are repulsive at short distances and clearly become zero by increasing distance as we expected.
Darboux transformation and solutions of the two-component Hirota-Maxwell-Bloch system
Creators: name: Yang, Jieming
name: Li, Chuanzhong
name: Li, Tiantian
name: Cheng, Zhaoneng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In this paper, we derive n-fold Darboux transformation of the two-component Hirota and the Maxwell-Bloch(TH-MB) equations and its determinant representation. Using Darboux determinant representation, we provide soliton solutions, positon solutions of the TH-MB equations.
Quasi-simultaneous Optical Flux and Polarization Variability of the Binary Super Massive Black Hole Blazar OJ 287 from 2015 to 2023: Detection of an Anticorrelation in Flux and Polarization Variability
Creators: name: Gupta, Alok C.
name: Kushwaha, Pankaj
name: Valtonen, Mauri J.
name: Savchenko, Sergey S.
name: Jorstad, Svetlana G.
name: Imazawa, Ryo
name: Wiita, Paul J.
name: Gu, Minfeng
name: Marscher, Alan P.
name: Zhang, Zhongli
name: Bachev, Rumen
name: Borman, G. A.
name: Gaur, Haritma
name: Grishina, T. S.
name: Hagen-Thorn, V. A.
name: Kopatskaya, E. N.
name: Larionov, V. M.
name: Larionova, E. G.
name: Larionova, L. V.
name: Morozova, D. A.
name: Nakaoka, T.
name: Strigachev, A.
name: Troitskaya, Yulia V.
name: Troitsky, I. S.
name: Uemura, M.
name: Vasilyev, A. A.
name: Weaver, Z. R.
name: Zhovtan, A. V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the optical flux and polarization variability of the binary black hole blazar OJ 287 using quasi-simultaneous observations from 2015 to 2023 carried out using telescopes in the USA, Japan, Russia, Crimea, and Bulgaria. This is one of the most extensive quasi-simultaneous optical flux and polarization variability studies of OJ 287. OJ 287 showed large amplitude, ~3.0 mag flux variability, large changes of ~37% in degree of polarization, and a large swing of ~215 degrees in the angle of the electric vector of polarization. During the period of observation, several flares in flux were detected. Those flares are correlated with a rapid increase in the degree of polarization and swings in electric vector of polarization angle. A peculiar behavior of anticorrelation between flux and polarization degree, accompanied by a nearly constant polarization angle, was detected from JD 2,458,156 to JD 2,458,292. We briefly discuss some explanations for the flux and polarization variations observed in OJ 287.
description: 14 pages, 4 figures, 2 tables, Published in Astrophysical Journal Letters, 2023 November 1
Sub-20-Attosecond Timing Jitter Mode-Locked Fiber Lasers
Creators: name: Kim, Hyoji
name: Qin, Peng
name: Song, Youjian
name: Yang, Heewon
name: Shin, Junho
name: Kim, Chur
name: Jung, Kwangyun
name: Wang, Chingyue
name: Kim, Jungwon
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We demonstrate 14.3-attosecond timing jitter [integrated from 10 kHz to 94 MHz offset frequency] optical pulse trains from 188-MHz repetition-rate mode-locked Yb-fiber lasers. In order to minimize the timing jitter, we shorten the non-gain fiber length to shorten the pulsewidth and reduce excessive higher-order nonlinearity and nonlinear chirp in the fiber laser. The measured jitter spectrum is limited by the amplified spontaneous emission limited quantum noise in the 100 kHz - 1 MHz offset frequency range, while it was limited by the relative intensity noise-converted jitter in the lower offset frequency range. This intrinsically low timing jitter enables sub-100-attosecond synchronization between the two mode-locked Yb-fiber lasers over the full Nyquist frequency with a modest 10-kHz locking bandwidth. The demonstrated performance is the lowest timing jitter measured from any free-running mode-locked fiber lasers, comparable to the performance of the lowest-jitter Ti:sapphire solid-state lasers.
description: 7 pages, 8 figures, 1 table
Long and short term variability of seven blazars in six near-infrared/optical bands
Creators: name: Sandrinelli, Angela
name: Covino, Stefano
name: Treves, Aldo
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Context. We present the light curves of six BL Lac objects, PKS 0537-441, PKS 0735+17, OJ 287, PKS 2005-489, PKS 2155-304, W Comae, and of the flat spectrum radio quasar PKS 1510-089, as a part of a photometric monitoring program in the near-infrared/optical bands started in 2004. All sources are Fermi blazars. Aims. Our purpose is to investigate flux and spectral variability on short and long time scales. Systematic monitoring, independent of the activity of the source, guarantees large sample size statistics, and allows an unbiased view of different activity states on weekly or daily time scales for the whole timeframe and on nightly timescales for some epochs. Methods. Data were obtained with the REM telescope located at the ESO premises of La Silla (Chile). Light curves were gathered in the optical/near-infrared VRIJHK bands from April 2005 to June 2012. Results. Variability >= 3 mag is observed in PKS 0537-441, PKS 1510-089 and PKS 2155-304, the largest ranges spanned in the near-infrared. The color intensity plots show rather different morphologies. The spectral energy distributions in general are well fitted by a power law, with some deviations that are more apparent in low states. Some variability episodes during a night interval are well documented for PKS 0537-441 and PKS 2155-304. For the latter source the variability time scale implies a large relativistic beaming factor.
description: 21 pages,18 figures
Electroweak structure of light nuclei within chiral effective field theory
Creators: name: Marcucci, L. E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We review the results of the most recent calculations for the electromagnetic structure of light nuclei, the weak muon capture on deuteron and 3He and the weak proton-proton capture reaction at energies of astrophysical interest, performed within the chiral effective field theory framework.
description: 6 pages, 3 figures, submitted to Few-Body Systems
Propagation of light in the presence of gravity generated by static and spherically symmetric curved space-times using Maxwell equations
Creators: name: Falcón-Gómez, Enderson
name: Amor-Martín, Adrián
name: De La Rubia, Valentín
name: Santamaría-Botello, Gabriel
name: De Falco, Vittorio
name: Muñoz, Luis Enrique Garcia
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this manuscript, we present an alternative method for calculating null geodesics in General Static Isotropic Metrics in General Relativity and Extended Theories of Gravity. By applying a conformal transformation, we are able to consider an analogue gravity model, where curvature is encoded in the dielectric and magnetic properties of a medium. In other words, we pass from curved to flat space-times, where instead of the Einstein field equations, the Maxwell equations are solved. Within this geometrical background, the photon geodesics are calculated. Then, given different black hole and wormhole metrics, we apply this method obtaining an excellent agreement with respect to the exact solutions in the original gravity framework by committing angular deviations below $3^\circ$. Finally, we provide the image of a Schwarzschild black hole surrounded by a thin accretion disk, and the apparent image of a Morris & Thorne-like wormhole within an angular discrepancy below $4^\circ$.
description: 9 pages, 8 Figures. Published in the European Physical Journal C on 22 December 2022
Using THELI pipeline in order to reduce Abell 226 multi-band optical images
Creators: name: Joveini, R.
name: Sotoudeh, S.
name: Roozrokh, A.
name: Taheri, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: In this paper we review THELI (Erben & Schrimer, 2005), an image processing pipeline developed to reduce multi-pointing optical images taken by mosaic CCD cameras. This pipeline works on raw images by removing several instrumental contaminations, implementing photometric calibration and astrometric alignment, and constructing a deep co-added mosaic image complemented by a weight map. We demonstrate the procedure of reducing NGC3923 images from raw data to the final results. We also demonstrate the quality of our data reduction strategy using mag-count and mag-error in mag plots. Emphasis is mainly placed on photometric calibration which is of great interest to us due to our scientific case. Based on the cross-association of the extracted catalogue against a reference catalogue of stellar magnitudes, zero-point calibration is performed. Our data reduction strategy and the method employed for cross-correlating large catalogues is also presented.
description: 5 pages, 2 figures
Local Segmental Dynamics and Stresses in Polystyrene - C$_{60}$ Mixtures
Creators: name: Vogiatzis, Georgios G.
name: Theodorou, Doros N.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The polymer dynamics of homogeneous C$_{60}$-polystyrene mixtures in the molten state are studied via molecular simulations using two interconnected levels of representation for polystyrene nanocomposites: (a) A coarse-grained representation, in which each polystyrene repeat unit is mapped into a single "superatom" and each fullerene is viewed as a spherical shell. Equilibration of coarse-grained polymer-nanoparticle systems at all length scales is achieved via connectivity-altering Monte Carlo simulations. (b) An atomistic representation, where both nanoparticles and polymer chains are represented in terms of united-atom forcefields. Initial configurations for atomistic Molecular Dynamics (MD) simulations are obtained by reverse mapping well-equilibrated coarse-grained configurations. By analyzing MD trajectories under constant energy, the segmental dynamics of polystyrene (for neat and filled systems) is characterized in terms of bond orientation time autocorrelation functions. Nanocomposite systems are found to exhibit slightly slower segmental dynamics than the unfilled ones, in good agreement with available experimental data. Moreover, by employing Voronoi tessellation of the simulation box, the mean-squared displacement of backbone carbon atoms is quantified in the vicinity of each fullerene molecule. Fullerenes are found to suppress the average motion of polymeric chains, in agreement with neutron scattering data, while slightly increasing the dynamic and stress heterogeneity of the melt. Atomic-level and local (per Voronoi cell) stress distributions are reported for the pure and the filled systems.
description: 15 pages, 16 figures
MTS-DVGAN: Anomaly Detection in Cyber-Physical Systems using a Dual Variational Generative Adversarial Network
Creators: name: Sun, Haili
name: Huang, Yan
name: Han, Lansheng
name: Fu, Cai
name: Liu, Hongle
name: Long, Xiang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Artificial Intelligence (cs.AI)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Deep generative models are promising in detecting novel cyber-physical attacks, mitigating the vulnerability of Cyber-physical systems (CPSs) without relying on labeled information. Nonetheless, these generative models face challenges in identifying attack behaviors that closely resemble normal data, or deviate from the normal data distribution but are in close proximity to the manifold of the normal cluster in latent space. To tackle this problem, this article proposes a novel unsupervised dual variational generative adversarial model named MST-DVGAN, to perform anomaly detection in multivariate time series data for CPS security. The central concept is to enhance the model's discriminative capability by widening the distinction between reconstructed abnormal samples and their normal counterparts. Specifically, we propose an augmented module by imposing contrastive constraints on the reconstruction process to obtain a more compact embedding. Then, by exploiting the distribution property and modeling the normal patterns of multivariate time series, a variational autoencoder is introduced to force the generative adversarial network (GAN) to generate diverse samples. Furthermore, two augmented loss functions are designed to extract essential characteristics in a self-supervised manner through mutual guidance between the augmented samples and original samples. Finally, a specific feature center loss is introduced for the generator network to enhance its stability. Empirical experiments are conducted on three public datasets, namely SWAT, WADI and NSL_KDD. Comparing with the state-of-the-art methods, the evaluation results show that the proposed MTS-DVGAN is more stable and can achieve consistent performance improvement.
description: 27 pages, 14 figures, 8 tables. Accepted by Computers & Security
211in.FR Tableau des usages de modèle
Creators: name: Succar, Bilal
Publisher: name: Zenodo
Year: 2019
Subjects: Model Use

description: Les Usages de modèle identifient et compilent les Exigences en matière de données qui doivent être livrées en tant que modèle numérique 3D ou être intégrées à celui-ci
Quantum-interference origin and magnitude of 1/$f$ noise in Dirac nodal line IrO$_2$ nanowires at low temperatures
Creators: name: Chien, Po-Yu
name: Wu, Chih-Yuan
name: Wang, Ruey-Tay
name: Chiu, Shao-Pin
name: Kirchner, Stefan
name: Yeh, Sheng-Shiuan
name: Lin, Juhn-Jong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present 1/$f$ noise measurements of IrO$_2$ nanowires from 1.7 to 350 K. Results reveal that the noise magnitude (represented by Hooge parameter $γ$) increases at low temperatures, indicating low-frequency resistance noise from universal conductance fluctuations. The cause of this noise is determined to be due to oxygen vacancies in the rutile structure of IrO$_2$. Additionally, the number density of these mobile defects can be calculated from the $\sqrt{T}$ resistance rise caused by the orbital two-channel Kondo effect in the Dirac nodal line metal IrO$_2$.
description: 5 pages, 4 figures
Parental Gender Stereotypes and Student Wellbeing in China
Creators: name: Chu, Shuai
name: Zeng, Xiangquan
name: Zimmermann, Klaus F.
name: Chu, Shuai
name: Zeng, Xiangquan
name: Zimmermann, Klaus F.
Publisher: name: Unknown
Year: 2020
Subjects: subject: Health Economics and Policy
subject: Institutional and Behavioral Economics
subject: Labor and Human Capital
subject: Gender identity
subject: gender stereotypes
subject: student wellbeing
subject: non-cognitive abilities
subject: mental health
subject: subjective wellbeing

description: Non-cognitive abilities are supposed to affect students’ educational performance, who are challenged by parental expectations and norms. Using standard econometric techniques, parental gender stereotypes are shown to strongly decrease student wellbeing in China. Students are strongly more depressed, feeling blue, unhappy, not enjoying life and sad while parental education does not matter. The relationships though dealing with a gender-specific issue do not exhibit gender-specific differences: Neither does it matter who the parent is, nor whether the kid concerned is a boy or a girl. Parental stereotypes may undermine girls' self-confidence and make them more prone to anxiety and other mental health issues. For boys, stronger stereotypes may indicate higher expectations and pressures, which also generate negative emotions.
Total electronic Raman scattering in the charge-density-wave phase of the spinless Falicov-Kimball model
Creators: name: Matveev, O. P.
name: Shvaika, A. M.
name: Freericks, J. K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The total electronic Raman scattering spectrum, including the nonresonant, mixed and resonant components, is determined for the charge-density-wave (CDW) phase of the spinless Falicov-Kimball model at half filling within dynamical mean-field theory. Its frequency dependence is investigated for different values of the energy of the incident photons. The spectra reflect the different structures in the density of states and how they are modified by screening and resonance effects. The calculations are performed for the $B_{\rm 1g}$, $B_{\rm 2g}$ and $A_{\rm 1g}$ symmetries (which are typically examined in experiment). Our results for the resonance effects of the Raman spectra, found by tuning the energy of the incident photons, give information about the many-body charge dynamics of the CDW-ordered phase.
description: 8 pages, contribution to the proceedings of the 3rd Conference "Statistical Physics: Modern Trends and Applications", June 23-25, 2009 Lviv, Ukraine
The Stacking in Bulk and Bilayer Hexagonal Boron Nitride
Creators: name: Constantinescu, Gabriel
name: Kuc, Agnieszka
name: Heine, Thomas
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The stacking orders in layered hexagonal boron nitride bulk and bilayers are studied using high-level ab initio theory (local second-order Moller-Plesset perturbation theory, LMP2). Our results show that both electrostatic and London dispersion interactions are responsible for interlayer distance and stacking order, with AA' being the most stable one. The minimum energy sliding path includes only the AA' high-symmetry stacking, and the energy barrier is 3.4 meV per atom for the bilayer. State-of-the-art Density-functionals with and without London dispersion correction fail to correctly describe the interlayer energies with the exception of PBEsol that agrees very well with our LMP2 results and experiment.
description: Accepted to Phys. Rev. Lett., 10 pages, 2 figures, SI provided
Integers With A Predetermined Prime Factorization
Creators: name: Naslund, Eric
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: A classic question in analytic number theory is to find asymptotics for $σ_{k}(x)$ and $π_{k}(x)$, the number of integers $n\leq x$ with exactly $k$ prime factors, where $π_{k}(x)$ has the added constraint that all the factors are distinct. This problem was originally resolved by Landau in 1900, and much work was subsequently done where $k$ is allowed to vary. In this paper we look at a similar question about integers with a specific prime factorization. Given $\boldsymbolα\in\mathbb{N}^{k}$, $\boldsymbolα=(α_{1},α_{2},...,α_{k})$ let $σ_{\boldsymbolα}(x)$ denote the number of integers of the form $n=p_{1}^{α_{1}}... p_{k}^{α_{k}}$ where the $p_{i}$ are not necessarily distinct, and let $π_{\boldsymbolα}(x)$ denote the same counting function with the added condition that the factors are distinct. Our main result is asymptotics for both of these functions.
description: 10 pages. Updated English, took into account reviewers suggestions, and fixed typos