Miracle-dz/UniFAR-FTUs huggingface dataset:
Observing Musical Communities Dedicated to Improvisation on TikTok Using Web Scraping

In this paper we present a research dealing with musical improvisation practices on TikTok as part of a project devoted to the development of a music improvisation software. Finding musicians to experiment with led us to explore the musical collaborations encouraged by the platform. The duo function appears to be one of its most important feature from this point of view. Tracking relationships between musicians who duet with each other leads to the definition of musical communities that form on the network. These online communities pose new problems to the classic ethnographic approach to communities, and their study can benefit from new methods involving web scraping techniques. This article shows how to use these techniques in the context of TikTok and analyses some properties of the graphs that can be drawn from web scraping data collected within the musical communities that are formed thanks to the duet function. Certain properties of the graph, such as source and sink nodes, are highlighted and linked to musical roles such as soloist and accompanist.
Artificial Intelligence-Driven Convergence and its Moderating Effect on Multi-Source Trust Transfer

AI-driven convergence describes how innovative products emerge from the interplay of embedded artificial intelligence (AI) in existing technologies. Trust transfer theory provides an excellent opportunity to deepen prevailing discussions about trust in such converged products. However, AI-driven convergence challenges existing theoretical assumptions. The context-specific interplay of multiple trust sources may affect users’ trust transfer and the predominance of trust sources. We contextualized AI-driven convergence and investigated its impact on multi-source trust transfer. We conducted semi-structured interviews with 25 participants in the context of autonomous vehicles. Our results indicate that users’ perceived trust source control, perceived trust source accessibility, and perceived trust source value creation share may moderate users’ trust transfer. We contribute to research by contextualizing convergence in AI, revealing the impact of AI-driven convergence on trust transfer and the importance of trust as a dynamic construct.
Digital Commons at Oberlin Digital Commons at Oberlin Quality of SQL Code Security on StackOverflow and Methods of Quality of SQL Code Security on StackOverflow and Methods of Prevention Prevention

This paper explores the frequency at which SQL/PHP posts on the website Stackoverﬂow. com contain code susceptible to SQL Injection, a common database vulnerability. Speciﬁcally, we analyze whether other users give notice of the vulnerability or provide an answer that is secure. The majority of questions analyzed were vulnerable to SQL Injection and were not corrected in their answers or brought to the attention of the original poster. To mitigate this, we present a machine learning bot which analyzes the poster’s code and alerts them of potential injection vulnerabilities, if necessary.
Large-Eddy Simulation of Particle-Driven Gravity-Currents

Submitted for the DFD08 Meeting of The American Physical Society Large-Eddy Simulation of Particle-Driven Gravity-Currents ROLF HENNIGER, Institute of Fluid Dynamics, ETH Zurich, ECKART MEIBURG, Department of Mechanical Engineering, University of California at Santa Barbara, LEONHARD KLEISER, Institute of Fluid Dynamics, ETH Zurich — A gravity current forms when a heavier fluid propagates into a lighter one. In the case of particle-driven gravity currents, the density difference is caused by a differential loading of the fluid with small suspended particles. The particle influence is described in an Eulerian framework, such that the particles are represented as a concentration field. Typical Reynolds and Schmidt numbers in reality are orders of magnitude larger than those which are within reach of direct numerical simulation (DNS). In large-eddy simulations (LES) only the largest scales of the turbulent fluid motion are resolved by the numerical procedure, while the small (subgrid) scales are modeled. The LES approach is applied to both the fluid equations and the particle concentration equation. In the present work, we compare LES to DNS results at moderate Reynolds and Schmidt numbers. In particular, we consider the energy budget of the flow, the mixing behavior and the sedimentation profiles in a lock exchange configuration. Rolf Henniger Institute of Fluid Dynamics, ETH Zurich Date submitted: 04 Aug 2008 Electronic form version 1.4
Operational Resource Theory of Continuous-Variable Nonclassicality

Genuinely quantum states of a harmonic oscillator may be distinguished from their classical counterparts by the Glauber-Sudarshan P-representation -- a state lacking a positive P-function is said to be nonclassical. In this paper, we propose a general operational framework for studying nonclassicality as a resource in networks of passive linear elements and measurements with feed-forward. Within this setting, we define new measures of nonclassicality based on the quantum fluctuations of quadratures, as well as the quantum Fisher information of quadrature displacements. These lead to fundamental constraints on the manipulation of nonclassicality, especially its concentration into subsystems, that apply to generic multi-mode non-Gaussian states. Special cases of our framework include no-go results in the concentration of squeezing and a complete hierarchy of nonclassicality for single mode Gaussian states.
Probing the Spinning of the Massive Black Hole in the Galactic Center via Pulsar Timing: A Full Relativistic Treatment

Pulsars around the massive black hole (MBH) in the Galactic center (GC) are expected to be revealed by upcoming facilities (e.g., the Square Kilometer Array). Under a full relativistic framework with the pulsar approximated as a test particle, we investigate the constraints on the spinning of the MBH by monitoring the timing of surrounding pulsars. For GC pulsars orbiting closely around the MBH (e.g., ≲1000 au), we find that full relativistic treatment in modeling accurately their timing signals can be necessary, as the relativistic signals are orders of magnitude larger than the time-of-arrival measurement accuracies. Although usually there are near degeneracies among MBH spin parameters, the constraints on the spinning of the MBH are still very tight. By continuously monitoring a normal pulsar in orbits with a period of ∼2.6 yr and an eccentricity of 0.3–0.9 under a timing precision of 1–5 ms, within ∼8 yr the spin magnitude and the orientations of the GC MBH can be constrained with error of and , respectively. Even for pulsars in orbits similar to the detected star S2/S0-2 or S0-102, we find that the spinning of the MBH can still be constrained within 4–8 yr, with the most significant constraints provided near the pericenter passage. If the proper motion of the pulsars with astrometric accuracy of 10 μas can also be collected along with the timing measurement, then the position, velocity, mass, and distance to the solar system of the MBH can be constrained to ∼10 μas, ∼1 μas yr−1, , and ∼1 pc, respectively.
A Search for Cool Subdwarfs: Stellar Parameters for 134 Candidates

The results of a search for cool subdwarfs are presented. Kinematic (U, V, and W) and stellar parameters (Teff, log g, [Fe/H], and ξt) are derived for 134 candidate subdwarfs based on high‐resolution spectra. The observed stars span 4200 K < Teff < 6400 K and −2.70 < [Fe/H] < 0.25 including only eight giants (log g < 4.0). Of the sample, 100 stars have MgH bands present in their spectra. The targets were selected by their large reduced proper motion, by the offset from the solar‐metallicity main sequence, or from the literature. We confirm the claims made by Ryan that the NLTT catalog is a rich source of subdwarfs and verify the success of the reduced proper‐motion constraint in identifying metal‐poor stars.
The Concept of Retrofitting Suburban in Commercial Corridor

Pasar Ikan Lama, located on the Commercial Road, is a well-known commercial area in Medan. The location is close to the city center so that local and foreign tourists easily find it. The place dominates by cloth sales such as kebaya wholesaler center, headscarves, Mukenah, prayer mats, carpets, batik, traditional clothing, and their items are originating from Makah such as dates and zam-zam water. The phenomenon that is now occurring in the Pasar Ikan Lama is an untidy arrangement. Another phenomenon is the strategic position that is adjacent to the historical area. Even so, the Pasar Ikan Lama is still visited. Visitors come not only from Medan but from various regions to foreign countries. The Pasar Ikan Lama can use as a destination or icon for the City of Medan. Therefore, it is necessary to revitalize it to increase vitality in the area of ​​the Pasar Ikan Lama. Revitalization model for the Medan commercial corridor with the concept of suburban retrofitting carried out using the theory of Suburban Retrofitting as a basis, accordingly the idea of Hamid Shirvani as a determinant of needs from a commercial corridor, Lynch theory is beneficial as a determinant of something interesting, potentially to be developed or abolished. The results of the study obtained from this study are the revitalization model of the Medan City commercial corridor with the concept of suburban retrofitting
The Impact of Boundary Spanning by Public Managers on Collaboration and Infrastructure Project Performance

Abstract The public sector is increasingly collaborating with the private sector in the development of large-scale public infrastructure projects. However, the difficulties arising due to working across organizational boundaries are often detrimental to project performance. This article argues that boundary-spanning activities can enhance the quality of collaboration and subsequently the performance of projects. Boundary spanners utilize relational governance mechanisms and undertake conscious endeavors for building interorganizational relationships by engaging in activities, such as coordination and communication with the stakeholders. The data for this study are composed of 158 survey responses from lead public managers involved in Dutch national public infrastructure projects. The data are analyzed using structural equation modeling. The study demonstrates that the quality of collaboration has a significant impact on the performance of the project during the implementation phase. Further, we find that the different boundary-spanning activities are interconnected and that they have a significant positive relationship on project performance, with a mediating effect of collaboration. The study concludes that, and shows how boundary spanners are vital to the collaborative processes through which public infrastructure projects are implemented.
Mermin-Wagner physics, (H,T) phase diagram, and candidate quantum spin-liquid phase in the spin-12 triangular-lattice antiferromagnet Ba8CoNb6O24

Ba$_8$CoNb$_6$O$_{24}$ presents a system whose Co$^{2+}$ ions have an effective spin 1/2 and construct a regular triangular-lattice antiferromagnet (TLAFM) with a very large interlayer spacing, ensuring purely two-dimensional character. We exploit this ideal realization to perform a detailed experimental analysis of the $S = 1/2$ TLAFM, which is one of the keystone models in frustrated quantum magnetism. We find strong low-energy spin fluctuations and no magnetic ordering, but a diverging correlation length down to 0.1 K, indicating a Mermin-Wagner trend towards zero-temperature order. Below 0.1 K, however, our low-field measurements show an unexpected magnetically disordered state, which is a candidate quantum spin liquid. We establish the $(H,T)$ phase diagram, mapping in detail the quantum fluctuation corrections to the available theoretical analysis. These include a strong upshift in field of the maximum ordering temperature, qualitative changes to both low- and high-field phase boundaries, and an ordered regime apparently dominated by the collinear "up-up-down" state. Ba$_8$CoNb$_6$O$_{24}$ therefore offers fresh input for the development of theoretical approaches to the field-induced quantum phase transitions of the $S = 1/2$ Heisenberg TLAFM.
DIFFUSIVE ACCELERATION OF PARTICLES AT OBLIQUE, RELATIVISTIC, MAGNETOHYDRODYNAMIC SHOCKS

Diffusive shock acceleration (DSA) at relativistic shocks is expected to be an important acceleration mechanism in a variety of astrophysical objects including extragalactic jets in active galactic nuclei and gamma-ray bursts. These sources remain good candidate sites for the generation of ultrahigh energy cosmic rays. In this paper, key predictions of DSA at relativistic shocks that are germane to the production of relativistic electrons and ions are outlined. The technique employed to identify these characteristics is a Monte Carlo simulation of such diffusive acceleration in test-particle, relativistic, oblique, magnetohydrodynamic (MHD) shocks. Using a compact prescription for diffusion of charges in MHD turbulence, this approach generates particle angular and momentum distributions at any position upstream or downstream of the shock. Simulation output is presented for both small angle and large angle scattering scenarios, and a variety of shock obliquities including superluminal regimes when the de Hoffmann–Teller frame does not exist. The distribution function power-law indices compare favorably with results from other techniques. They are found to depend sensitively on the mean magnetic field orientation in the shock, and the nature of MHD turbulence that propagates along fields in shock environs. An interesting regime of flat-spectrum generation is addressed; we provide evidence for it being due to shock drift acceleration, a phenomenon well known in heliospheric shock studies. The impact of these theoretical results on blazar science is outlined. Specifically, Fermi Large Area Telescope gamma-ray observations of these relativistic jet sources are providing significant constraints on important environmental quantities for relativistic shocks, namely, the field obliquity, the frequency of scattering, and the level of field turbulence.
Shock Capturing with Discontinuous Galerkin Method

Abstract—Shock capturing has been a challenge for compu-tational ﬂuid dynamicists over the years. This article deals withdiscontinuous Galerkin method to solve the hyperbolic equationsin which solutions may develop discontinuities in ﬁnite time. Thehigh order discontinuous Galerkin method combining the basisof ﬁnite volume and ﬁnite element methods has shown a lotof attractive features for a wide range of applications. Varioustechniques proposed in the literature to deal with discontinuitiesbasically reduce the order of interpolation in the region aroundthese discontinuities. The accuracy of the scheme therefore maybe degraded in the vicinity of the shock. The proposed methodresolves the discontinuities presented in the solution by applyingviscosity into the shock-containing elements. The discontinuity isspread over a distance and is well approximated in the space ofinterpolation functions. The technique of adding viscosity to thesystem and the indicator based on the expansion coefﬁcients ofthe solution are presented. A number of numerical examples inone and two dimensions is carried out to show the capability ofthe scheme for shock capturing.Index Terms—Discontinuous Galerkin method, indicator, lim-iter, shock capturing.
Narrow-line Seyfert 1s: what is wrong in a name?

Narrow-line Seyfert 1s (NLSy1s) are an ill-defined class. Work done over the past 20 years as well as recent analyses show a continuity in properties (e.g., Balmer line profiles, blueshifts of high-ionization lines) between sources with FWHM above and below 2000 km/s, the defining boundary of NLSy1s. This finding alone suggests that comparisons between samples of NLSy1s and rest of broad-line AGNs are most likely biased. NLSy1s can be properly contextualized by their location on the quasar main sequence originally defined by Sulentic et al 2000. At one end, NLSy1s encompass sources with strong FeII emission and associated with high Eddington ratio that hold the promise of becoming useful distance indicators; at the other end, at least some of them are sources with broad profiles seen face-on. Any rigid FWHM limit gives rise to some physical ambiguity, as the FWHM of low-ionization lines depends in a complex way on mass, Eddington ratio, orientation, and luminosity. In addition, if the scaling derived from luminosity and virial dynamics applies to the broad line regions, NLSy1s at luminosity higher than 1E47 erg/s become physically impossible. Therefore, in a broader context, a proper subdivision of two distinct classes of AGNs and quasars may be achieved by the distinction between Pop. A and B with boundary at = 4000 km/s in samples at z < 1, or on the basis of spectrophotometric properties which may ultimately be related to differences in accretion modes if high-luminosity quasars are considered.
The Arizona Radio Observatory 1 mm Spectral Survey of the Hypergiant Star NML Cygni (215–285 GHz)

A sensitive (1σ rms ≤ 3 mK; 2 MHz resolution) 1 mm spectral survey (214.5–285.5 GHz) of the envelope of the oxygen-rich supergiant star NML Cygni (NML Cyg) has been conducted using the 10 m Submillimeter Telescope of the Arizona Radio Observatory. These data represent the first spectral line survey of NML Cyg and are complementary to a previous 1 mm survey of the envelope of a similar hypergiant, VY Canis Majoris (VY CMa). The complete NML Cyg data set is presented here. In the survey, 104 emission lines were observed, arising from 17 different molecules and 4 unidentified features. Many of the observed features have complex line profiles, arising from asymmetric outflows characteristic of hypergiant stars. While most of the lines in the survey arise from SiO, SO, SO2, and SiS, CO had the strongest emission. Five other C-bearing species are identified in the survey (HCN, CN, HCO+, CS, and HNC), demonstrating an active carbon chemistry despite the O-rich environment. Moreover, NS was observed, but not NO, although favorable transitions of both molecules lie in the surveyed region. Sulfur chemistry appears to be prominent in NML Cyg and plays an important role in the collimated outflows. The refractory species observed, NaCl and AlO, have narrow emission lines, indicating that these molecules do not reach the terminal expansion velocity. NaCl and AlO likely condense into dust grains at r < 50 R *. From NaCl, the chlorine isotope ratio was determined to be 35Cl/37Cl = 3.85 ± 0.30.
Searching for dark matter with neutron star mergers and quiet kilonovae

We identify new astrophysical signatures of dark matter that implodes neutron stars (NSs), which could decisively test whether NS-imploding dark matter is responsible for missing pulsars in the Milky Way galactic center, the source of some $r$-process elements, and the origin of fast-radio bursts. First, NS-imploding dark matter forms $\sim 10^{-10}$ solar mass or smaller black holes inside neutron stars, which proceed to convert neutron stars into $\sim$1.5 solar mass BHs. This decreases the number of neutron star mergers seen by LIGO/Virgo (LV) and associated merger kilonovae seen by telescopes like DES, BlackGEM, and ZTF, and instead, producing a population of "black mergers" containing $\sim$1.5 solar mass black holes. Second, dark matter-induced neutron star implosions may create a new kind of kilonovae that lacks a detectable, accompanying gravitational signal, which we call "quiet kilonovae. " Using DES data and the Milky Way's r-process abundance, we constrain quiet kilonovae. Third, the spatial distribution of neutron star merger kilonovae and quiet kilonovae in galaxies can be used to detect dark matter. NS-imploding dark matter destroys most neutron stars at the centers of disc galaxies, so that neutron star merger kilonovae would appear mostly in a donut at large radii. We find that as few as ten neutron star merger kilonova events, located to $\sim$1 kpc precision could validate or exclude dark matter-induced neutron star implosions at $2 \sigma$ confidence, exploring dark matter-nucleon cross-sections 4-10 orders of magnitude below current direct detection experimental limits. Similarly, NS-imploding dark matter as the source of fast radio bursts can be tested at $2 \sigma$ confidence once 20 bursts are located in host galaxies by radio arrays like CHIME and HIRAX.
An Investigation of the Factors affecting Flexible Manufacturing Competence of Organizations

Owing to the fluctuating demands of customers and intensified competition, organizations are searching ways to enhance their flexible manufacturing competence (FMC) as it has been recognized as one of the most important approaches to handle the aforementioned situations. The existing literature provides several factors that significantly affect FMC, however, the interrelationships among these factors are somewhat unexplored. The insights to the interactions among these factors could provide crucial managerial implications that could pave ways for success of organizations in today’s uncertain business environment. To this end, the present work makes an effort and highlights the important factors and investigates their interactions with each other for the enhancement of FMC of organizations. In this paper, the interpretive structural modelling (ISM) methodology has been implemented to explore the interactions and develop a structural model depicting the hierarchy of the factors. Further, MICMAC analysis has been used to categorize the factors into different groups based on their driving and dependence powers.
A new global potential energy surface of the ground state of SiH2+ (X2A1) system and dynamics calculations of the Si++ H2 (v 0 = 2, j 0 = 0) → SiH++ H reaction

A global potential energy surface (PES) of the ground state of SiH2+ system is built by using neural network method based on 18223 ab initio points. The topographic properties of PES are presented and compared with previous theoretical and experimental studies. The results indicate that the spectroscopic parameters obtained from the new PES are in good agreement with the experimental data. In order to further verify the validity of the new PES, a test dynamics calculation of the Si+ + H2 (v 0 = 2, j 0 = 0) → H + SiH+ reaction has been carried out by using the time-dependent wave packet method. The integral cross sections and rate constants are computed for the title reaction. The reasonable dynamical behavior indicates that the newly constructed PES is suitable for relevant dynamics investigations.
Interplanetary scintillation with the Murchison Widefield Array I: a sub-arcsecond survey over 900 deg2 at 79 and 158 MHz

We present the first dedicated observations of Interplanetary Scintillation (IPS) with the Murchison Widefield Array (MWA). We have developed a synthesis imaging technique, tailored to the properties of modern "large-N" low-frequency radio telescopes. This allows us to image the variability on IPS timescales across 900 square degrees simultaneously. We show that for our observations, a sampling rate of just 2Hz is sufficient to resolve the IPS signature of most sources. We develop tests to ensure that IPS variability is separated from ionospheric or instrumental variability. We validate our results by comparison with existing catalogues of IPS sources, and near-contemporaneous observations by other IPS facilities. Using just five minutes of data, we produce catalogues at both 79MHz and 158MHz, each containing over 350 scintillating sources. At the field centre we detect approximately one scintillating source per square degree, with a minimum scintillating flux density at 158MHz of 110mJy, corresponding to a compact flux density of approximately 400mJy. Each of these sources is a known radio source, however only a minority were previously known to contain sub-arcsecond components. We discuss our findings and the prospects they hold for future astrophysical and heliospheric studies.