cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spiralling out of control: 3D hydrodynamical modelling of the colliding winds in $η\thinspace$Carinae
Creators: name: Parkin, E. R.
name: Pittard, J. M.
name: Corcoran, M. F.
name: Hamaguchi, K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Three dimensional (3D) adaptive-mesh refinement (AMR) hydrodynamical simulations of the wind-wind collision between the enigmatic super-massive star \etacar and its mysterious companion star are presented which include radiative driving of the stellar winds, gravity, optically-thin radiative cooling, and orbital motion. Simulations with static stars with a periastron passage separation reveal that the preshock companion star's wind speed is sufficiently reduced that radiative cooling in the postshock gas becomes important, permitting the runaway growth of non-linear thin shell (NTSI) instabilities which massively distort the WCR. However, large-scale simulations which include the orbital motion of the stars, show that orbital motion reduces the impact of radiative inhibition, and thus increases the acquired preshock velocities. As such, the postshock gas temperature and cooling time see a commensurate increase, and sufficient gas pressure is preserved to stabilize the WCR against catastrophic instability growth. We then compute synthetic X-ray spectra and lightcurves and find that, compared to previous models, the X-ray spectra agree much better with {\it XMM-Newton} observations just prior to periastron. The narrow width of the 2009 X-ray minimum can also be reproduced. However, the models fail to reproduce the extended X-ray mimimum from previous cycles. We conclude that the key to explaining the extended X-ray minimum is the rate of cooling of the companion star's postshock wind. If cooling is rapid then powerful NTSIs will heavily disrupt the WCR. Radiative inhibition of the companion star's preshock wind, albeit with a stronger radiation-wind coupling than explored in this work, could be an effective trigger.
description: 25 pages, 20 figures, accepted for publication in ApJ
Fractional Exact Solutions and Solitons in Gravity
Creators: name: Baleanu, Dumitru
name: Vacaru, Sergiu I.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 26A33, 37K25, 53C60, 53C99, 70S05, 83C15

description: We survay our recent results on fractional gravity theory. It is also provided the Main Theorem on encoding of geometric data (metrics and connections in gravity and geometric mechanics) into solitonic hierarchies. Our approach is based on Caputo fractional derivative and nonlinear connection formalism.
description: latex2e, 11pt, 10 pages with table of content; a summary of our talk at Conference "New Trends in Nanotechnology and Nonlinear Dynamical Systems", 25--27 July, 2010, \c{C}ankaya University, Ankara, Turkey
Uncertainty Assessment of Dynamic Thermal Line Rating for Operational Use at Transmission System Operators
Creators: name: Rashkovska, Aleksandra
name: Jančič, Mitja
name: Depolli, Matjaž
name: Kosmač, Janko
name: Kosec, Gregor
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Transmission system operators (TSOs) in recent years have faced challenges in order to ensure maximum transmission capacity of the system to satisfy market needs, while maintaining operational safety and permissible impact on the environment. A great help in the decision-making process was introduced with the Dynamic Thermal Rating (DTR) - an instrument to monitor and predict the maximal allowed ampacity of the power grid based on weather measurements and forecast. However, the introduction of DTR raises a number of questions related to the accuracy and uncertainty of the results of thermal assessment and the level of acceptable risk and its management. In this paper, we present a solution for estimating DTR uncertainty, appropriate for operational use at TSOs. With the help of conductor surface temperature measurements, weather measurements and predicted weather data, we also estimate the error of the weather forecast and the DTR itself. Following the results of the data analyses, we build an operative solution for estimating the ampacity uncertainty based on Monte Carlo random simulations and integrate it into the operational environment of ELES - the operator of the Slovenian electric power transmission network.
On homotopies with triple points of classical knots
Creators: name: Fiedler, Thomas
name: Mortier, Arnaud
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25

description: We consider a knot homotopy as a cylinder in 4-space. An ordinary triple point $p$ of the cylinder is called {\em coherent} if all three branches intersect at $p$ pairwise with the same index. A {\em triple unknotting} of a classical knot $K$ is a homotopy which connects $K$ with the trivial knot and which has as singularities only coherent triple points. We give a new formula for the first Vassiliev invariant $v_2(K)$ by using triple unknottings. As a corollary we obtain a very simple proof of the fact that passing a coherent triple point always changes the knot type. As another corollary we show that there are triple unknottings which are not homotopic as triple unknottings even if we allow more complicated singularities to appear in the homotopy of the homotopy.
description: 10 pages, 13 figures, bugs in figures corrected
New method for the 3D Ising model
Creators: name: Chung, S. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A simple, general and practically exact method is developed for the equilibrium properties of the macroscopic physical systems with translational symmetry. Applied to the Ising model in two and three dimension, a modest calculation gives the spontaneous magnetization and the specific heat to less than 1% error.
Dual Labeling of Biomolecules by Using Click Chemistry: A Sequential Approach
Creators: name: Kele, Péter
name: Mezö, Gábor
name: Achatz, Daniela
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: click chemistry; copper; FRET; peptides
subject: 540 Chemie

description: Click by click: Dual labeling of model compounds was carried out by using copper-free and copper-mediated click chemistry in a sequential manner. This method was used to introduce two labels onto biological targets or nanoparticles, thus quickly converting them into fluorescence resonance energy transfer systems.
A minimal inverse seesaw model with $S_4$ flavour symmetry
Creators: name: Thapa, Bikash
name: Barman, Sunita
name: Bora, Sompriti
name: Francis, Ng. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We construct an $S_4$ flavour symmetric minimal inverse seesaw model where the standard model is extended by adding two right-handed and two standard model gauge singlets neutrinos to explain the origin of tiny neutrino masses. The resulting model describes the lepton mass spectra and flavour mixing quite well for the case of the normal hierarchy of neutrino masses. The prediction of the model on the Dirac CP-violating phase is centered around $370.087^\circ$. Furthermore, using the allowed region for the model parameters, we have calculated the value of the effective Majorana neutrino mass, $\lvert\langle m_{ee}\rangle\rvert$, which characterizes neutrinoless double beta decay.
description: 12 pages, 4 figures, 3 tables
Impact of Limited Feedback on MIMO-OFDM Systems using Joint Beamforming
Creators: name: Bouallegue, Najoua Achoura And Ridha
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences

description: In multi input multi output antenna systems, beamforming is a technique for guarding against the negative effects of fading. However, this technique requires the transmitter to have perfect knowledge of the channel which is often not available a priori. A solution to overcome this problem is to design the beamforming vector using a limited number of feedback bits sent from the receiver to the transmitter. In the case of limited feedback, the beamforming vector is limited to lie in a codebook that is known to both the transmitter and receiver.When the feedback is strictly limited, important issues are how to quantize the information needed at the transmitter and how much improvement in associated performance can be obtained as a function of the amount of feedback available.In this paper channel quantization schema using simple approach to codebook design (random vector quantization)is illustrated. Performance results show that even with a few bits of feedback, performance can be close to that with perfect channel knowledge at the transmitter.
Probe thermometry with continuous measurements
Creators: name: Boeyens, Julia
name: Annby-Andersson, Björn
name: Bakhshinezhad, Pharnam
name: Haack, Géraldine
name: Perarnau-Llobet, Martí
name: Nimmrichter, Stefan
name: Potts, Patrick P.
name: Mehboudi, Mohammad
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Temperature estimation plays a vital role across natural sciences. A standard approach is provided by probe thermometry, where a probe is brought into contact with the sample and examined after a certain amount of time has passed. In many situations however, continuously monitoring the probe may be preferred. Here, we consider a minimal model, where the probe is provided by a two-level system coupled to a thermal reservoir. Monitoring thermally activated transitions enables real-time estimation of temperature with increasing accuracy over time. Within this framework we comprehensively investigate thermometry in both bosonic and fermionic environments employing a Bayesian approach. Furthermore, we explore adaptive strategies and find a significant improvement on the precision. Additionally, we examine the impact of noise and find that adaptive strategies may suffer more than non-adaptive ones for short observation times. While our main focus is on thermometry, our results are easily extended to the estimation of other environmental parameters, such as chemical potentials and transition rates.
CKU 21: Išbi-Erra-Ibbi-Sîn 1, version longue (3.1.17)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: Sumerian
Ur
Translation
Traduction

description: Traduction Correspondence of the Kings of Ur 21: Išbi-Erra-Ibbi-Sîn 1, version longue (3.1.17) Pascal Attinger, 2012, actualisé en 2019
Voices up! : experiences of collective playmaking
Creators: name: Cook, Christopher
Publisher: name: University of British Columbia
Year: 2017

description: In January 2016, a group of community members, students, and staff began creating a play together at the UBC Learning Exchange, in Vancouver’s Downtown Eastside. For the next twenty-two months, the group wrote, rehearsed, and performed a collectively created theatre piece, entitled Voices UP! This thesis project casts four of the community members who took part in the collective creation process as co-inquirers, exploring their experiences of collaborative playmaking. Considering art’s potential to contribute to mental health, the author combines two complementary qualitative methods – research-based theatre and narrative analysis – to investigate the co-inquirers’ experiences of playmaking in terms of relevance to wellbeing. The study results, drawing from interview transcripts, drawings, and objects from the collective creation process, are presented as both a thematic analysis, and a short play script, entitled Give Me Your Hands. Reflecting the process used to create Voices UP!, the short script was collectively written by the author and four co-inquirers. Give Me Your Hands is a play about making a play, and illustrates the shared and individual experiences of those who took part in a community-based collective creation process.
Mechanical performance comparison of two surgical constructs for wrist four-corner arthrodesis via dorsal and radial approaches
Creators: name: Faudot, Barthélémy
name: Ballerini, Julien
name: Ross, Mark
name: Bellemère, Philippe
name: de Monsabert, Benjamin Goislard
name: Vigouroux, Laurent
name: Milan, Jean-Louis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Background: Four-corner arthrodesis, which involves fusing four carpal bones while removing the scaphoid bone, is a standard surgery for the treatment of advanced stages of wrist arthritis. Nowadays, it can be performed using a dorsal approach by fixing a plate to the bones and a new radial approach is in development. To date, there is no consensus on the biomechanically optimal and most reliable surgical construct for four-corner arthrodesis. Methods: To evaluate them biomechanically and thus assist the surgeon in choosing the best implant orientation, radial or dorsal, the two different four-corner arthrodesis surgical constructs were virtually simulated on a 3D finite element model representing all major structures of the wrist. Two different realistic load sets were applied to the model, representing common tasks for the elderly. Findings: Results consistency was assessed by comparing with the literature the force magnitude computed on the carpal bones. The Von Mises stress distribution in the radial and dorsal plates were calculated. Stress concentration was located at the plate-screw interface for both surgical constructs, with a maximum stress value of 413 MPa for the dorsal plate compared to 326 MPa for the radial plate, meaning that the stress levels are more unfavourable in the dorsal approach. Interpretation: Although some bending stress was found in one load case, the radial plate was mechanically more robust in the other load case. Despite some limitations, this study provides, for the first time, quantified evidence that the newly developed radial surgical construct is mechanically as efficient as the dorsal surgical construct.
Precise predictions for the associated production of a $W$ boson with a top-antitop quark pair at the LHC
Creators: name: Buonocore, Luca
name: Devoto, Simone
name: Grazzini, Massimiliano
name: Kallweit, Stefan
name: Mazzitelli, Javier
name: Rottoli, Luca
name: Savoini, Chiara
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The production of a top-antitop quark pair in association with a $W$ boson ($t\bar tW$) is one of the heaviest signatures currently probed at the Large Hadron Collider (LHC). Since the first observation reported in 2015 the corresponding rates have been found to be consistently higher than the Standard Model predictions, which are based on next-to-leading order~(NLO) calculations in the QCD and electroweak (EW) interactions. We present the first next-to-next-to-leading order (NNLO) QCD computation of $t\bar tW$ production at hadron colliders. The calculation is exact, except for the finite part of the two-loop virtual corrections, which is estimated using two different approaches that lead to consistent results within their uncertainties. We combine the newly computed NNLO QCD corrections with the complete NLO QCD+EW results, thus obtaining the most advanced perturbative prediction available to date for the \ttW inclusive cross section. The tension with the latest ATLAS and CMS results remains at the $1σ-2σ$ level.
description: 7 pages, 3 figures, 1 table. Minor changes, version published on PRL
In Memoriam Cornelis de Jager
Creators: name: Rutten, Robert J.
name: Engvold, Oddbjørn
name: Nieuwenhuizen, Adrianus C. T.
Publisher: name: arXiv
Year: 2022
Subjects: subject: History and Philosophy of Physics (physics.hist-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Cornelis ("Kees") de Jager, co-founder of "Solar Physics", passed away in 2021. He was an exemplary human being, a great scientist, and had large impact on our field. In this tribute we first briefly summarize his life and career and then describe some of his solar activities, from his PhD thesis on the hydrogen lines in 1952 to the book on cycle-climate relations completed in 2020.
description: Compliant with publisher stipulations the ArXiv version is the initial manuscript submitted in July 2021. It does not reflect changes made by the journal editor and publisher. Its posting waited on the required publication DOI
Surprisingly Robust In-Hand Manipulation: An Empirical Study
Creators: name: Bhatt, Aditya
name: Sieler, Adrian
name: Puhlmann, Steffen
name: Brock, Oliver
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We present in-hand manipulation skills on a dexterous, compliant, anthropomorphic hand. Even though these skills were derived in a simplistic manner, they exhibit surprising robustness to variations in shape, size, weight, and placement of the manipulated object. They are also very insensitive to variation of execution speeds, ranging from highly dynamic to quasi-static. The robustness of the skills leads to compositional properties that enable extended and robust manipulation programs. To explain the surprising robustness of the in-hand manipulation skills, we performed a detailed, empirical analysis of the skills' performance. From this analysis, we identify three principles for skill design: 1) Exploiting the hardware's innate ability to drive hard-to-model contact dynamics. 2) Taking actions to constrain these interactions, funneling the system into a narrow set of possibilities. 3) Composing such action sequences into complex manipulation programs. We believe that these principles constitute an important foundation for robust robotic in-hand manipulation, and possibly for manipulation in general.
description: Published in Robotics: Science and Systems 2021. Proceedings at http://www.roboticsproceedings.org/rss17/p089.html Spotlight talk at https://youtu.be/2vwdP4WjGoQ Complete video playlist at https://www.youtube.com/playlist?list=PLb-CNILz7vmt6Ae_yD9i15TrCw0S8bKCn
Probing the Activity of Matrix Metalloproteinase II with a Sequentially Click-Labeled Silica Nanoparticle FRET Probe
Creators: name: Achatz, Daniela E.
name: Mező, Gábor
name: Kele, Peter
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: click chemistry; fluorescence; FRET; MMP-2; nanoparticles; silica
subject: 540 Chemie

description: Selective double click labeling: The determination of nanomolar concentrations of matrix metalloproteinase II is made possible through the use of a nanoprobe that consists of fluorescently doped silica nanoparticles to which a FRET-based enzyme substrate has been conjugated through sequential click reactions.
New diode laser-excitable green fluorescent label and its application to detection of bovine serum albumin via microchip electrophoresis
Creators: name: Link, Martin
name: Schulze, Philipp
name: Belder, Detlev
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Microchip electrophoresis - Fluorescence label - Protein detection
subject: 540 Chemie

description: A novel amino-reactive fluorescent label is presented that is based on a yellow daylight chromophore and fluorophore. Its absorption band is wide and peaks at 431 nm in water solution, thus well matching the lines of either the 375-nm and the 431-nm diode lasers and of many frequency-variable dye lasers. When conjugated to bovine serum albumin (BSA), the fluorescence peaks at 501 nm with a quantum yield of 0.21. Its large Stokes' shift of 70 nm facilitates the discrimination of undesired excitation light which is particularly important for sensitive detection in miniaturized separation techniques such as microchip capillary electrophoresis (MCE). Unlike several other fluorophores, the fluorescence intensity of the new label is independent of pH over a broad range (3 to 9). The applicability of the label is demonstrated by labeling the amino acid lysine and the 66 kD protein BSA, and by separating BSA from the free label via MCE within 90 s. The limit of detection is in the order of 12 nM at an optically active path length of 20 µm.
Survey on some optimization possibilities for data plane applications
Creators: name: Altangerel, Gereltsetseg
name: Máté, Tejfel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: By programming both the data plane and the control plane, network operators can customize their networks based on their needs, regardless of the hardware manufacturer. Control plane programming, a major component of the SDN (Software Defined Network) concept, has been developed for more than 10 years and successfully implemented in real networks. Efforts to develop reconfigurable data planes and high-level network programming languages make it truly possible to program data planes. Therefore, the programmable data planes and SDNs offer great flexibility in network customization, allowing many innovations to be introduced on the network. The general focus of research on the data plane is data-plane abstractions, languages and compilers, data plane algorithms, and applications. This paper outlines some emerging applications on the data plane and offers opportunities for further improvement and optimization.
description: Keywords: Data plane, load balancing, in-network caching, in-network computing, in-network data aggregation, INT
Parameter Estimation of Stellar Mass Binary Black Holes under the Network of TianQin and LISA
Creators: name: Lyu, Xiangyu
name: Li, En-Kun
name: Hu, Yi-Ming
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a Bayesian parameter estimation progress to infer the stellar mass binary black hole properties by TianQin, LISA, and TianQin+LISA.Two typical stellar mass black hole binary systems, GW150914 and GW190521 are chosen as the fiducial sources. In this work, we establish the ability of TianQin to infer the parameters of those systems and first apply the full frequency response in TianQin's data analysis. We obtain the parameter estimation results and explain the correlation between them. We also find the TianQin+LISA could marginally increase the parameter estimation precision and narrow the $1σ$ area compared with TianQin and LISA individual observations. We finally demonstrate the importance of considering the effect of spin when the binaries have a nonzero component spin and great deviation will appear especially on mass, coalescence time and sky location.
description: 17 pages, 6 figures,
Clickable fluorophores for biological labeling—with or without copper
Creators: name: Kele, Peter
name: Li, Xiaohua
name: Link, Martin
name: Nagy, Krisztina
name: Herner, András
name: Lőrincz, Krisztián
name: Béni, Szabolcs
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 540 Chemie

description: The synthesis of a set of new clickable fluorophores that virtually cover the whole visible spectrum reaching the near infra-red regime is presented herein. Besides dyes that are capable of participating in classical copper catalyzed 1,3-dipolar cycloaddition reactions with the counterparting function we have also prepared dyes containing a cyclooctyne moiety, an alkyne derivative that enables copper free clicking to azides. The suitability of these dyes for fluorescent labeling of biomolecules is presented by examples on model frameworks representing major biopolymer building blocks. The versatility of these dyes is presented in cell labeling experiments as well as by labeling the azide modified surface glycans of CHO-cells either by copper catalyzed or copper-free click reaction. These dyes are expected to have a large variety of applications in (bio)orthogonal labeling schemes both in vivo and in vitro.
Method for simultaneous luminescence sensing of two species using optical probes of different decay time, and its application to an enzymatic reaction at varying temperature
Creators: name: Nagl, Stefan
name: Stich, Matthias I. J.
name: Schäferling, Michael
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Dual sensing - Luminescence lifetime - Oxygen sensing - Temperature sensing - Fluorescence imaging
subject: 540 Chemie

description: Chemical sensing, imaging and microscopy based on the use of fluorescent probes has so far been limited almost exclusively to the detection of a single parameter at a time. We present a scheme that can overcome this limitation by enabling optical sensing of two parameter simultaneously and even at identical excitation and emission wavelengths of two probes provided (a) their decay times are different enough to enable two time windows to be recorded, and (b) the emission of the shorter-lived probe decays to below the detectable limit while that of the other still can be measured. We refer to this new scheme as the dual lifetime determination (DLD) method and show that it can be widely varied by appropriate choice of probes and experimental settings. DLD is demonstrated to work by sensing oxygen and temperature independently from each other by making use of two probes, one for oxygen (a platinum porphyrin dissolved in polystyrene), and one for temperature [a europium complex dissolved in poly(vinyl methylketone)]. DLD was applied to monitor the consumption of oxygen in the glucose oxidase-catalyzed oxidation of glucose at varying temperatures. The scheme is expected to have further applications in cellular assays and biophysical imaging.
A study on thorium levels in human femur bones
Creators: name: Kandlbinder, Robert
name: Schupfner, Robert
name: Wolfbeis, Otto S.
name: Zinka, Bettina
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: Thorium - Human bone tissue - Incorporation
subject: 540 Chemie

description: The incorporation of naturally occurring thorium isotopes in human femur bones was studied by analyzing 28 bone samples. The results show that the activity concentrations of 232Th and 230Th are in the range of the blank values resulting in an upper limit of theirs activity concentrations in human bones. The presence of 228Th can be attributed, on the basis of model calculations, to the radioactive decay of deposited 228Ra. We conclude that thorium is not detectably incorporated into human bones.
On the experience of encountering art in museum spaces : an inquiry with Gilles Deleuze's concepts of desire and assemblage
Creators: name: Berard, Marie-France
Publisher: name: University of British Columbia
Year: 2017

description: Framed by the theoretical concepts of assemblage and desire from philosopher Gilles Deleuze, and his collaborative writings with psychoanalyst Félix Guattari (Deleuze and Guattari, 1983, 1987), this study inquires into the qualities and productive potential of the art encounter in a gallery setting. The study brings together my practice in the field of art museum education, and my interest in the art encounter to inquire what the art encounter does. Thinking with Deleuzian concepts enacts a view of the art encounter as a milieu of experimentation where affects move a body to create assemblages, connections with things, human and non-human bodies, expressions, qualities, ideas, spaces. Assemblages allow desire (as a force) to circulate; desiring-assemblages move bodies to produce connections with other human or non-human entities, thoughts, they produce subjectivation as a mode of existence. For Deleuze, one does not 'have' an experience of an artwork or exhibition detached against the background of life; experience is a milieu which contributes to actually making life. My study inquires how working within a philosophy conceived in terms of relationality, connections, flows and multiplicity (rather than fixed identities) enact a view of the art encounter as a milieu of immanent ethics. By immanent ethics, Deleuze means that encountering increases the potential for new connections, it can actualize the possibilities already in life. The experience of encountering art is inviting one into experiences of living. This post-qualitative study followed a process of research as assemblage formed by: the research site at the Vancouver Art Gallery, and the dynamic constellation of interconnected objects, bodies, ideas such as my field notes, photographs, the writing of personal narratives of my encounterings in the gallery space, and scholarly texts. Throughout the research process, two guiding questions remained present: 1) With the production of data in autobiographical fieldnotes, how does Deleuze’s concepts of desire and assemblage help me inquire about my art encounters, and what insights can I bring forth on the art encounter? 2) In what ways does thinking with Deleuzian concepts enlarge received discourses in art education and museum education about the art encounter within the art museum?
A Nanogel for Ratiometric Fluorescent Sensing of Intracellular pH Values
Creators: name: Peng, Hong-shang
name: Stolwijk, Judith A.
name: Sun, Li-Ning
name: Wegener, Joachim
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: cellular sensing; fluorescence; FRET; pH sensors
subject: 540 Chemie

description: A ratiometric fluorescent nanogel can sense pH over a range that is applicable to physiological studies. It can be easily prepared and made pH-responsive by addition of a pH probe and a FRET system that utilizes the gel to hold dyes in close proximity (see picture; overlay of coumarin dye and Nile Red fluorescence in kidney cells).
Tracing the origin of migratory pests using geochemical fingerprinting : application to European starling in the Okanagan Valley of British Columbia, Canada
Creators: name: K C, Upama
Publisher: name: University of British Columbia
Year: 2017

description: The European starling (EUST) (Sturnidae: Sturnus vulgaris L.) is an invasive bird in North America where it is an agricultural pest. In British Columbia (Canada), the EUST population increases in orchards and vineyards in autumn, coinciding with ripening fruits. Starlings also create damage in dairy farms and feedlots by eating and contaminating food, and spreading diseases. Damage can be partly mitigated by the use of scare deterrents. However, scare techniques mainly serve to divert flocks until they become acclimated. Large-scale trapping and euthanizing before they move to fields and farms is the most practical means of preventing damage, but requires knowledge of natal origin. Within a small (20,831 km²), agriculturally significant portion of south-central British Columbia, the Okanagan Valley, I employed analyses of 21 trace elements in bone tissue to discriminate the spatial distribution of juvenile EUST and to reveal the geographic origin of the problem birds. Stepwise discriminant analysis of trace elements classified juveniles from 64-79 % accurately to their natal origin, including sites that are 12 km apart. The elemental fingerprint of juveniles collected in the same area was different in two consecutive years (2015 and 2016). In both years, the majority of problem birds (55% in 2015 and 79 % in 2016) caught in vineyards and orchards were derived from the North Okanagan. In contrast, 89% of problem birds caught at dairy farms and feedlots were not from Okanagan and 11% were local in 2015; 100% of problem birds were local in 2016. It is unlikely that starlings from outside the region were misidentified as Okanagan Valley starlings because the geochemical fingerprints of those outside of the valley are very distinct. Thus, elemental signatures can separate populations with a high degree of spatial accuracy within several 10s of km, yielding a promising tool for identifying the geographic origin of migratory birds even over small geographic scales. These findings suggested that further control of starlings in vineyards and orchards, be targeted to the northern and southern regions of the valley; control in dairy farms and feedlots will require an expansion of the trapping program outside the region.
Understanding the dynamics of randomly positioned dipolar spin ensembles
Creators: name: Gräßer, Timo
name: Rezai, Kristine
name: Sushkov, Alexander O.
name: Uhrig, Götz S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Dipolar spin ensembles with random spin positions attract much attention currently because they help to understand decoherence as it occurs in solid state quantum bits in contact with spin baths. Also, these ensembles are systems which may show many-body localization, at least in the sense of very slow spin dynamics. We present measurements of the autocorrelations of spins on diamond surfaces in a doubly-rotating frame which eliminates local disorder. Strikingly, the time scales in the longitudinal and the transversal channel differ by more than one order of magnitude which is a factor much greater than one would have expected from simulations of spins on lattices. A previously developed dynamic mean-field theory for spins (spinDMFT) fails to explain this phenomenon. Thus, we improve it by extending it to clusters (CspinDMFT). This theory does capture the striking mismatch up to two orders of magnitude for random ensembles. Without positional disorder, however, the mismatch is only moderate with a factor below 4. The pivotal role of positional disorder suggests that the strong mismatch is linked to precursors of many-body localization.
description: 21 pages, 12 figures
Examining Challenges and Opportunities in Journalism and Mass Communication
Creators: name: Shweta Garg
name: Samiksha Garg
Publisher: name: Journal of Interdisciplinary and Multidisciplinary Research
Year: 2025

description: Over the last decade, AI has become an integral part of society, particularly in the media industry. Robot journalism and AI anchors are now present in newsrooms. This paper aims to critically examine the challenges and opportunities of AI anchors in TV journalism. The study systematically reviews 35 research articles from the last seven years (2016–2023) using the Preferred Reporting Items for Systematic Reviews & Meta-Analysis (PRISMA) approach and the ADO (Antecedent, Decision, and Outcome) framework. The literature was manually searched. AI is a progressive and innovative technology for organizations across various industries. AI anchors and traditional anchors can strengthen themselves and complement each other. Therefore, AI can be successfully applied to the media industry. This study also identifies future research areas, particularly focusing on AI anchors, their challenges, and opportunities in different countries such as China, the US, Germany, and others. Currently, there is no comprehensive literature review exploring the impact of AI anchors in TV journalism. This review aims to provide deeper insights and contribute to the development of this research field.
Event Shape Selection Method in Search of the Chiral Magnetic Effect in Heavy-ion Collisions
Creators: name: Xu, Zhiwan
name: Chan, Brian
name: Wang, Gang
name: Tang, Aihong
name: Huang, Huan Zhong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The search for the chiral magnetic effect (CME) in heavy-ion collisions has been impeded by the significant background arising from the anisotropic particle emission pattern, particularly elliptic flow. To alleviate this background, the event shape selection (ESS) technique categorizes collision events according to their shapes and projects the CME observables to a class of events with minimal flow. In this study, we explore two event shape variables to classify events and two elliptic flow variables to regulate the background. Each type of variable can be calculated from either single particles or particle pairs, resulting in four combinations of event shape and elliptic flow variables. By employing a toy model and the realistic event generator, event-by-event anomalous-viscous fluid dynamics (EBE-AVFD), we discover that the elliptic flow of resonances exhibits correlations with both the background and the potential CME signal, making the resonance flow unsuitable for background control. Through the EBE-AVFD simulations of Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV with various input scenarios, we ascertain that the optimal ESS strategy for background control entails utilizing the single-particle elliptic flow in conjunction with the event shape variable based on particle pairs.
Highly resolved dose–response functions for drug-modulated bacteria cultivation obtained by fluorometric and photometric flow-through sensing in microsegmented flow
Creators: name: Funfak, Anette
name: Hartung, Regina
name: Cao, Jialan
name: Martin, Karin
name: Wiesmüller, Karl-Heinz
name: Wolfbeis, Otto S.
name: Köhler, J. Michael
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Micro fluid segments; Droplet-based flow; Antibiotics; Drug detection; Dose–response functions; On-line pH sensing; Cell density monitoring
subject: 540 Chemie

description: The application of the micro fluid segment technique for the investigation of highly resolved dose–response relationship at the physiological parameters segment–internal pH and growth of the cell culture is introduced. The method was used to study the concentration-dependent response of an Escherichia coli culture for the effectors 2,4-dinitrophenol (DNP) and an antibacterial peptide amide (KKVVFKVKFK-NH2). Large sequences with up to 250 micro fluid segments containing gradually varying concentrations of the effectors were generated using a PTFE micro fluidic arrangement, including a 7-port-manifold and PC-controlled syringe pumps. The response of the cell culture was characterized by a double sensor system allowing for simultaneous read out of metabolism-related changes as well as changes in cell density. A twin arrangement of a micro flow-through photometer and a micro flow-through fluorometer based on LED devices in connection with the application of pH-sensitive polymer sensor particles was applied. This experimental setup allows a detailed determination of drug-related changes in fluorescence intensity by the E. coli culture and the polymer particles as a function of time by tracking changes in pH and cell density. The application of the segmented flow technique for multi-parameter drug screenings provides new insights into the biological answer of bacteria cultures cultivated at the nanoliter scale.
Spatio-Temporal Momentum: Jointly Learning Time-Series and Cross-Sectional Strategies
Creators: name: Tan, Wee Ling
name: Roberts, Stephen
name: Zohren, Stefan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Portfolio Management (q-fin.PM)
subject: Machine Learning (cs.LG)
subject: Trading and Market Microstructure (q-fin.TR)
subject: Machine Learning (stat.ML)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: We introduce Spatio-Temporal Momentum strategies, a class of models that unify both time-series and cross-sectional momentum strategies by trading assets based on their cross-sectional momentum features over time. While both time-series and cross-sectional momentum strategies are designed to systematically capture momentum risk premia, these strategies are regarded as distinct implementations and do not consider the concurrent relationship and predictability between temporal and cross-sectional momentum features of different assets. We model spatio-temporal momentum with neural networks of varying complexities and demonstrate that a simple neural network with only a single fully connected layer learns to simultaneously generate trading signals for all assets in a portfolio by incorporating both their time-series and cross-sectional momentum features. Backtesting on portfolios of 46 actively-traded US equities and 12 equity index futures contracts, we demonstrate that the model is able to retain its performance over benchmarks in the presence of high transaction costs of up to 5-10 basis points. In particular, we find that the model when coupled with least absolute shrinkage and turnover regularization results in the best performance over various transaction cost scenarios.
Convergence of halo statistics: code comparison between Rockstar and CompaSO using scale-free simulations
Creators: name: Maleubre, Sara
name: Eisenstein, Daniel J.
name: Garrison, Lehman H.
name: Joyce, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this study, we perform a halo-finder code comparison between Rockstar and CompaSO. Based on our previous analysis aiming at quantifying resolution of $N$-body simulations by exploiting large (up to $N=4096^3$) simulations of scale-free cosmologies run using Abacus, we focus on convergence of the HMF, 2PCF and mean radial pairwise velocities of halo centres selected with the aforementioned two algorithms. We establish convergence, for both Rockstar and CompaSO, of mass functions at the $1\%$ precision level and of the mean pairwise velocities (and also 2PCF) at the $2\%$ level. At small scales and small masses, we find that Rockstar exhibits greater self-similarity, and we also highlight the role played by the merger-tree post-processing of CompaSO halos on their convergence. Finally, we give resolution limits expressed as a minimum particle number per halo in a form that can be directly extrapolated to LCDM.
description: 13 pages, accepted in MNRAS. arXiv admin note: substantial text overlap with arXiv:2211.07607
The Role of Baryon Structure in Neutron Stars
Creators: name: Motta, Theo F.
name: Thomas, Anthony W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Understanding the equation of state of dense nuclear matter is a fundamental challenge for nuclear physics. It is especially timely and interesting challenge as we have reached a period where neutron stars, which contain the most dense nuclear matter in the Universe, are now being studied in completely new ways, from gravitational waves to satellite based telescopes. We review the theoretical approaches to calculating this equation of state which involve a change in the structure of the baryons.
description: published in Modern Physics Letters A
Counting roots of fully triangular polynomials over finite fields
Creators: name: Coelho, José Gustavo
name: Martínez, Fabio Enrique Brochero
Publisher: name: arXiv
Year: 2023
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11T06, 11D45, 11T24

description: Let $\mathbb{F}_q$ be a finite field with $q$ elements, $f \in \mathbb{F}_q[x_1, \dots, x_n]$ a polynomial in $n$ variables and let us denote by $N(f)$ the number of roots of $f$ in $\mathbb{F}_q^n$. %Many authors, such as Wei Cao and Kung Jiang have used augmented degree matrices to determine $N(f)$ for different families of polynomials. In this paper we consider the family of fully triangular polynomials, i.e., polynomials of the form \begin{equation*}
 f(x_1, \dots, x_n) = a_1 x_1^{d_{1,1}} + a_2 x_1^{d_{1,2}} x_2^{d_{2,2}} + \dots + a_n x_1^{d_{1,n}}\cdots x_n^{d_{n,n}} - b, \end{equation*} where $d_{i,j} > 0$ for all $1 \le i \le j \le n$. For these polynomials, we obtain explicit formulas for $N(f)$ when the augmented degree matrix of $f$ is row-equivalent to the augmented degree matrix of a linear polynomial or a quadratic diagonal polynomial.
Upconverting nanoparticle based optical sensor for carbon dioxide
Creators: name: Ali, Reham
name: Saleh, Sayed M.
name: Meier, Robert J.
name: Azab, Hassan A.
name: Abdelgawad, Ibraheim I.
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: Optical sensor; Carbon dioxide; Nanoparticle; Upconversion; Luminescence
subject: 540 Chemie

description: We demonstrate a novel optical sensor for carbon dioxide in concentrations between 0 and 3%. The sensing scheme is based on the optical interrogation of a 12-μm polystyrene (PS) film containing upconverting nanoparticles (UCNPs; 40–100 nm in size) of the type NaYF4:Yb,Er, and the longwave absorption pH probe bromothymol blue (BTB) in its anionic (blue) form. PS is chosen as a matrix because it displays permeation selectivity for CO2 and rejects protons. The color of BTB in the PS matrix depends on the partial pressure of CO2 gas. The UCNPs are photoexcited with a 980-nm laser diode to give a green (542 nm) and a red (657 nm) emission whose intensity is screened off (depending on whether BTB is present in its blue or yellow form) due to an inner filter effect. The luminescence intensities of the UCNPs at 542 nm and 657 nm increase with increasing concentration of CO2. The pH probe BTB (a sulfonate) is used in the form of a lipophilic ion pair with the tetrabutylammonium cation (TBA). The strong base tetraoctylammonium hydroxide is added to the system and acts as a base to convert BTB in its phenoxide (blue) form, but also creates a buffer system. This is the first optical sensor for CO2 that is based on the use of UCNPs. Its response time is not, vert, similar10 s on switching from pure argon gas to 1% CO2 in argon, the recovery time of the sensing film is not, vert, similar180 s, and the detection limit is 0.11% of CO2.
The oxygen vs. sodium (anti)correlation(s) in omega Cen
Creators: name: D'Antona, F.
name: D'Ercole, A.
name: Marino, A. F.
name: Milone, A. P.
name: Ventura, P.
name: Vesperini, E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Recent exam of large samples of omega Cen giants shows that it shares with mono-metallic globular clusters the presence of the sodium versus oxygen anticorrelation, within each subset of stars with iron content in the range -1.9-1.3 in omega Cen are likely to have formed directly from the pure ejecta of massive AGBs of the same metallicities. This is possible if the massive AGBs of [Fe/H]>-1.3 in the progenitor system evolve when all the pristine gas surrounding the cluster has been exhausted by the previous star formation events, or the proto--cluster interaction with the Galaxy caused the loss of a significant fraction of its mass, or of its dark matter halo, and the supernova ejecta have been able to clear the gas out of the system. The absence of dilution in the metal richer populations lends further support to a scenario of the formation of second generation stars in cooling flows from massive AGB progenitors. We suggest that the entire formation of omega Cen took place in a few 10^8yr, and discuss the problem of a prompt formation of s--process elements.
description: The Astrophysical Journal, in press