cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Accurate determination of $^{6,7}$Li nuclear magnetic moments
Creators: name: Pachucki, Krzysztof
name: Patkóš, Vojtěch
name: Yerokhin, Vladimir A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We report an accurate determination of the nuclear magnetic dipole moments of $^{6,7}$Li from the measured ratio of the nuclear and the electron $g$-factors in atomic Li. The obtained results significantly improve upon the literature values and stress the importance of reliable theoretical calculations of the nuclear shielding corrections.
The True-Twin microcalorimeter: a proof-of-concept experiment
Creators: name: Oberto, Luca
name: Brunetti, Luciano
name: Sellone, Marco
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Applied Physics (physics.app-ph)
subject: Classical Physics (physics.class-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We present a proof-of-concept experiment to realize microwave primary power standard with a true-twin microcalorimeter. Double feeding line microcalorimeters are widely used by National Metrology Institutes. A drawback concerns the system calibration: traditional processes changes measurement conditions between system characterization and the measurement stage. Nevertheless, if the feeding lines are made twin, a measurement scheme that avoids separate characterization can be applied, equations simplify and time consumption is halved. Here we demonstrates the feasibility of the idea. The result of an effective efficiency spectroscopy of a thermoelectric power sensor is compared with figures obtained with well established methods.
description: 11 pages, 2 figures, 1 table
Low-Complexity Linear Diversity-Combining Detector for MIMO-OTFS
Creators: name: Thaj, Tharaj
name: Viterbo, Emanuele
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: This paper presents a low complexity detector for multiple-input multiple-output (MIMO) systems based on the recently proposed orthogonal time frequency space (OTFS) modulation. In the proposed detector, the copies of the transmitted symbol-vectors received through the different diversity branches (propagation paths and receive antennas) are linearly combined using the maximum ratio combining (MRC) technique to iteratively improve the signal to interference plus noise ratio (SINR) at the output of the combiner. To alleviate the performance degradation due to spatial correlation at the receiver antennas, we present a sample-based method to estimate such correlation and find the optimized combining weights for MRC from the estimated correlation matrix. The detector performance and complexity improve over the linear minimum mean square error (LMMSE) and message passing (MP) detectors proposed in the literature for MIMO-OTFS.
description: Published in IEEE Wireless Communications Letters
Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
Creators: name: Sarkar, Abhikbrata
name: Wang, Zhanning
name: Rendell, Mathew
name: Hendrickx, Nico W.
name: Veldhorst, Menno
name: Scappucci, Giordano
name: Khalifa, Mohammad
name: Salfi, Joe
name: Saraiva, Andre
name: Dzurak, A. S.
name: Hamilton, A. R.
name: Culcer, Dimitrie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this work we present a comprehensive theory of spin physics in planar Ge hole quantum dots in an in-plane magnetic field, where the orbital terms play a dominant role in qubit physics, and provide a brief comparison with experimental measurements of the angular dependence of electrically driven spin resonance. We focus the theoretical analysis on electrical spin operation, phonon-induced relaxation, and the existence of coherence sweet spots. We find that the choice of magnetic field orientation makes a substantial difference for the properties of hole spin qubits. Furthermore, although the Schrieffer-Wolff approximation can describe electron dipole spin resonance (EDSR), it does not capture the fundamental spin dynamics underlying qubit coherence. Specifically, we find that: (i) EDSR for in-plane magnetic fields varies non-linearly with the field strength and weaker than for perpendicular magnetic fields; (ii) The EDSR Rabi frequency is maximized when the a.c. electric field is aligned parallel to the magnetic field, and vanishes when the two are perpendicular; (iii) The Rabi ratio $T_1/T_π$, i.e. the number of EDSR gate operation per unit relaxation time, is expected to be as large as $5{\times}10^5$ at the magnetic fields used experimentally; (iv) The orbital magnetic field terms make the in-plane $g$-factor strongly anisotropic in a squeezed dot, in excellent agreement with experimental measurements; (v) The coherence sweet spots do not exist in an in-plane magnetic field, as the orbital magnetic field terms expose the qubit to all components of the defect electric field. These findings will provide a guideline for experiments to design ultrafast, highly coherent hole spin qubits in Ge.
Novel microporous layers with improved interfacial characteristics for PEM fuel cells
Creators: name: Janse Van Vuuren, Magrieta Jeanette Leeuwner
Publisher: name: University of British Columbia
Year: 2017

description: High efficiencies and reduced greenhouse gas emissions promote proton exchange membrane fuel cells (PEMFCs) as a promising energy conversion technology. However, its widespread commercial application is hampered by certain cost, performance and durability limitations. The interface between the MPL (microporous layer) and the cathode CL (catalyst layer) plays an important role in a PEMFC’s overall performance, since it houses the reaction sites for the oxygen reduction reaction. The interface may furthermore significantly affect mass transport behavior, ohmic contributions and the hydration state of the membrane at different humidities. The main objective of the study was therefore to advance PEMFC research through the development of alternative MPLs offering dual-functional improvements: enhanced interfacial characteristics and improved operational flexibility via suitability for low cathode humidity applications. Alternative MPLs were evaluated based on extensive material characterization and single cell performance testing. Graphene was demonstrated to be a promising alternative. The material displays beneficial interfacial characteristics (a stacked planar morphology, superior conductivity, adhesive behaviour, and improved electrical connectivity with the CL) and furthermore results in improvements in the kinetic and ohmic polarization regions, compared to the conventional CB (carbon black) MPL. Although graphene MPLs also suffer from mass transport limitations, the problem can be addressed through the addition of CB. The addition increases the MPL’s water permeability, which helps to establish a balance between water removal (for the prevention of flooding) and water retention (for membrane hydration) at high and low RH (relative humidity). For graphene tested under one-dimensional control, this results in synergistic performance enhancements, showing a 30% and 80% increase in the maximum power density at 100% and 20% cathode RH. In addition to increased water permeability, other common effects resulting from the creation of CB composites (also observed for reduced graphene oxide and graphite) include decreased surface wettability and through-plane resistance. For the application to low loaded CCMs (0.1 mg cm-²), the potential to improve performance with graphene-based MPLs appears restricted by the catalyst loading itself. Nevertheless, graphene helps to improve performance preservation of low loaded CCMs at low humidity conditions, as also demonstrated for conventionally loaded CCMs (0.4 mg cm-²).
Optical multiple chemical sensing: status and current challenges
Creators: name: Nagl, Stefan
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: 540 Chemie

description: Multiple optical sensors for chemical species are sensitive, non-toxic and non-invasive and enable spatially and temporally resolved multianalyte detection. Recent advances are highlighted with a focus on fluorescence-based methods and the biologically and clinically important analytes oxygen, pH, carbon dioxide and temperature. Indicator chemistries such as permeation-selective microbeads and nanoparticles allow the production of microscopically homogeneous sensor layers. The use of combinations of spectral discrimations along with time-resolved monitoring schemes based on luminescence lifetime or intensity-lifetime ratios enables all-optical real-time multianalyte determination.
Amplitudes of solar p modes: modelling of the eddy time-correlation function
Creators: name: Belkacem, K.
name: Samadi, R.
name: Goupil, M. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Modelling amplitudes of stochastically excited oscillations in stars is a powerful tool for understanding the properties of the convective zones. For instance, it gives us information on the way turbulent eddies are temporally correlated in a very large Reynolds number regime. We discuss the way the time correlation between eddies is modelled and we present recent theoretical developments as well as observational results. Eventually, we discuss the physical underlying meaning of the results by introducing the Ornstein-Uhlenbeck process, which is a sub-class of a Gaussian Markov process.
description: GONG 2010 - SoHO 24, A new era of seismology of the Sun and solar-like stars, to be published in the Journal of Physics: Conference Series (JPCS)
A Resonance Energy Transfer Immunoassay Based on a Thiol-Reactive Ruthenium Donor Dye and a Longwave-Emitting Acceptor
Creators: name: Weh, Jochen
name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2007
Subjects: subject: FRET; immunoassays; luminescence; ruthenium metal–ligand complex; thiol label
subject: 540 Chemie

description: A novel immunoassay is described that applies a thiol-reactive ruthenium metal–ligand complex as the donor dye in a luminescence energy transfer (LET) detection scheme. Unlike amine-reactive labels, the LET with a thiol label allows improved specificity and better reproducibility of labelling positions on proteins, because the number of reactive thiol groups of proteins is distinctly smaller. This helps to reduce the risk of over-labelling and self-quenching of the fluorophore. The synthesis of the thiol label was significantly improved, resulting in almost quantitative yields of pure product. The absorption and emission maxima of the ruthenium donor dye are at 460 nm and 600 nm, respectively, and a Stokes' shift of 140 nm warrants distinct separation of excitation and emission wavelengths even in turbid samples. A cyanine dye with an absorption maximum at 642 nm was chosen as the acceptor label because it has good overlap with the emission spectrum of the donor label. The emission of the acceptor peaks at 660 nm, thus further increasing the Stokes' shift (to an overall 200 nm). The quantification of anti-HSA with the LET immunoassay is possible with this new approach at concentrations as low as 220 pmol L−1.
Maser Threshold Characterization by Resonator Q-Factor Tuning
Creators: name: Zollitsch, Christoph W.
name: Ruloff, Stefan
name: Fett, Yan
name: Wiedemann, Haakon T. A.
name: Richter, Rudolf
name: Breeze, Jonathan D.
name: Kay, Christopher W. M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Whereas the laser is nowadays an ubiquitous technology, applications for its microwave analogue, the maser, remain highly specialized, despite the excellent low-noise microwave amplification properties. The widespread application of masers is typically limited by the need of cryogenic temperatures. The recent realization of a continuous-wave room-temperature maser, using NV$^-$ centers in diamond, is a first step towards establishing the maser as a potential platform for microwave research and development, yet its design is far from optimal. Here, we design and construct an optimized setup able to characterize the operating space of a maser using NV$^-$ centers. We focus on the interplay of two key parameters for emission of microwave photons: the quality factor of the microwave resonator and the degree of spin level-inversion. We characterize the performance of the maser as a function of these two parameters, identifying the parameter space of operation and highlighting the requirements for maximal continuous microwave emission.
Towards Hardware implementation of video applications in new telecommunications devices
Creators: name: Touil, Lamjed
name: Abdelali, Abdessalem Ben
name: Mtibaa, Abdellatif
name: Bourennane, Elbey
Publisher: name: arXiv
Year: 2010
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences

description: Among the areas, most demanding in terms of calculation is the telecommunication and video applications are now included in several telecommunication devices such as set-top boxes, mobile phones. Embedded videos applications in new generations of telecommunication devices need a processing capacity that can not be achieved by the conventional processor, to work around this problem the use of programmable technology has a lot of interest. First, Field Programmable Gate Arrays (FPGAs) present many performance benefits for real-time image processing applications. The FPGA structure is able to exploit spatial and temporal parallelism. In this paper, we present a new method for implementation of the Color Structure Descriptor (CSD) using the FPGA circuit. In fact the (CSD) provides satisfactory image indexing and retrieval results among all colorbased descriptors in MPEG-7. But the real time implementation of this descriptor is still having problems. In this paper we propose a method for adapting this descriptor for possible implementation under the constraints of the video processing in real time. We have verified the real-time implementation of the (CSD) with an image size of 120*80 pixels.
description: Lamjed Touil, Abdessalem Ben Abdelali, Abdellatif Mibaa and Elbey Bourennane, "Towards Hardware implementation of video applications in new telecommunications devices", Journal of Telecommunications, Volume 2, Issue 1, p75-85, April 2010
Nanoparticle-Enhanced Fluorescence Imaging of Latent Fingerprints Reveals Drug Abuse
Creators: name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: drug detection; fluorescence; imaging agents; immunoassays; nanoparticles
subject: 540 Chemie

description: No sweat! The sweat in a latent fingerprint (LFP) can contain orally ingested drugs and their metabolites. In a new method for drug detection, primary antibodies(Abs) against drug metabolites are conjugated to magnetic nanoparticles (NPs). The LFP is incubated with the NPs, excess particles removed, and the LFP treated with a fluorescently labeled secondary antibody. Fluorescence imaging then allows characterization.
Fully reversible optical biosensors for uric acid using oxygen transduction
Creators: name: Schrenkhammer, Petra
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: Uric acid; Fluorescence; Oxygen sensor; Oxygen probe; Enzymatic assay
subject: 540 Chemie

description: An optical biosensor is presented for continuous determination of uric acid. The scheme is based on the measurement of the consumption of oxygen during the oxidation of uric acid that is catalyzed by the enzyme uricase. The enzyme is immobilized in a polyurethane hydrogel next to a metal-organic probe whose fluorescence is quenched by oxygen. The consumption of oxygen was followed by measurement of changes of luminescence intensity of two kind of probes and can be related to the concentration of uric acid. Analytical ranges (0–2 mM), the response times (80–100 s), reproducibility, and long-term stability were investigated. The biosensors are stable for at least 1 month and are not interfered by common interferents. One kind of biosensor was applied to the determination of uric acid in human blood serum. The results agree with those of a commercial colorimetric detection kit.
Reconstructing the boundary of AdS from an infrared defect
Creators: name: Arias, Cesar
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We argue that the boundary of an asymptotically anti-de Sitter (AdS) space of dimension $d+1$, say $M^{d+1}$, can be locally reconstructed from a codimension-two defect located in the deep interior of a negatively curved Einstein manifold $X^{d+2}$ of one higher dimension. This means that there exist two different ways of thinking about the same $d$-submanifold, $Σ^d$: either as a defect embedded in the interior of $X^{d+2}$, or as the boundary of $M^{d+1}$ in a certain zero radius limit. Based on this idea and other geometric and symmetry arguments, we propose the existence of an infrared field theory on a bulk $\mathbb Z_n$-orbifold defect, located in the deepest point of the interior of AdS$^{d+2}$. We further conjecture that such a theory gives rise to the holographic theory at the asymptotic boundary of AdS$^{d+1}$, in the limit where the orbifold parameter $n\to\infty$. As an example, we compute a defect central charge when $Σ$ is a 2-manifold of fixed positive curvature, and show that its $n\to\infty$ limit reproduces the central charge of Brown and Henneaux.
description: ~30 pages, several figures and diagrams. V2: typos corrected, references added. Final, published version
Towards a Scalable and Trustworthy Blockchain: IoT Use Case
Creators: name: Moudoud, Hajar
name: Cherkaoui, Soumaya
name: Khoukhi, Lyes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Recently, blockchain has gained momentum as a novel technology that gives rise to a plethora of new decentralized applications (e.g., Internet of Things (IoT)). However, its integration with the IoT is still facing several problems (e.g., scalability, flexibility). Provisioning resources to enable a large number of connected IoT devices implies having a scalable and flexible blockchain. To address these issues, we propose a scalable and trustworthy blockchain (STB) architecture that is suitable for the IoT; which uses blockchain sharding and oracles to establish trust among unreliable IoT devices in a fully distributed and trustworthy manner. In particular, we design a Peer-To-Peer oracle network that ensures data reliability, scalability, flexibility, and trustworthiness. Furthermore, we introduce a new lightweight consensus algorithm that scales the blockchain dramatically while ensuring the interoperability among participants of the blockchain. The results show that our proposed STB architecture achieves flexibility, efficiency, and scalability making it a promising solution that is suitable for the IoT context.
description: This paper has been accepted for publication by ICC 2021-IEEE International Conference on Communications. The final version will be published by the IEEE
Entanglement perturbation theory for the quantum ground states in two dimensions
Creators: name: Chung, S. G.
name: Ueda, K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A simple, general and practically exact method, Entanglement Perturbation Theory (EPT), is formulated to calculate the ground states of 2D macroscopic quantum systems with translational symmetry. An emphasis will be placed on the applicability of EPT to fermions. We will discuss some preliminary evidences which indicate a potential of EPT.
Multicolor Fluorescent and Permeation-Selective Microbeads Enable Simultaneous Sensing of pH, Oxygen, and Temperature
Creators: name: Stich, Matthias I. J.
name: Schäferling, Michael
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: luminescence; microbeads; optical sensor; permeation selective polymers; time-resolved imaging
subject: 540 Chemie

description: Multicolor fluorescent microbeads made from various polymers and incorporated into a binder polymer to produce a material whose three signals (measuring pH, temperature, and presence of O2) can be unambiguously assigned after either spectral or time-resolved separation. This renders the material well suited for continuous sensing of these parameters in blood or other bioliquids.
Design of Battery management system for Residential applications
Creators: name: Pal, Poushali
name: R, Devabalaji K.
name: Priyadarshini, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Battery management system plays an important role for modern battery-powered application such as Electric vehicles, portable electronic equipment and storage for renewable energy sources. It also increases the life-cycle of the battery, battery state and efficiency. Monitoring the state of charge of the battery is a crucial factor for battery management system. This paper deals with monitoring the state of charge of the battery along with temperature, current for Solar panel fitted with battery for residential application. Microcontroller is used for controlling purpose, analog sensors are used for sensing the parameters of voltage, current. The information of the battery is given with tabular form and shown in photograph. Battery parameters are displayed with the LCD screen.
description: 6 Pages, No of figures- 14, Published with International Journal of Engineering Trends and Technology (IJETT)
Application of the Duperier method to the analysis of the cosmic muon flux dependence on the meteorological parameters, based on the DANSS detector data
Creators: name: Alekseev, I.
name: Belov, V.
name: Danilov, M.
name: Filosofov, D.
name: Fomina, M.
name: Kazartsev, S.
name: Kobyakin, A.
name: Kuznetsov, A.
name: Machikhiliyan, I.
name: Medvedev, D.
name: Nesterov, V.
name: Ponomarev, D.
name: Rozova, I.
name: Rumyantseva, N.
name: Rusinov, V.
name: Samigullin, E.
name: Shevchik, Ye.
name: Shirchenko, M.
name: Shitov, Yu.
name: Skrobova, N.
name: Svirida, D.
name: Tarkovsky, E.
name: Yakovleva, A.
name: Yakushev, E.
name: Zhitnikov, I.
name: Zinatulina, D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The detector DANSS is located under n industrial nuclear reactor at Kalininskaya Nuclear Power Plant. This location provides ~ 50 m.w.e. reduction of the cosmic muon flux in the vertical direction, which places the experiment in an intermediate position between ground and underground experiments in terms of shielding from the cosmic rays. The detector DANSS is located under an industrial nuclear reactor at Kalininskaya Nuclear Power Plant. This location provides ~50 m.w.e. reduction of the cosmic muon flux in the vertical direction, which places the experiment in an intermediate position between ground and underground experiments in terms of shielding from the cosmic rays. The detector's sensitive area consists of 2500 plastic scintillator counters, each 100x4x1 cm$^3$ in size, making in total a 1 m$^3$ volume, which is surrounded by a muon veto system and multiple layers of passive shielding. The main goal of the DANSS experiment is to study the antineutrino spectra at different distances from the source. For this purpose the detector is placed on a lifting platform, and the data is collected at three positions: 10.9 m, 11.9 m and 12.9 m from the center of the reactor core. The detector is capable of reconstructing muon tracks passing though the sensitive volume. In this work the barometric, height and temperature correlation coefficients are calculated in three areas of the zenith angle $θ$ using the Duperier approach. These results are based on the muon data collected during four years.
description: 7 pages, 3 figures, submitted to JETP letters (in Russian)
Radio-continuum jets around the peculiar galaxy pair ESO 295-IG022
Creators: name: Filipović, M. D.
name: Crawford, E. J.
name: Jones, P. A.
name: White, G. L.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We report new radio-continuum observations with the Australia Telescope Compact Array (ATCA) of the region surrounding the peculiar galaxy pair ESO 295-IG022, at the centre of the poor cluster Abell S0102. We observed this cluster at wavelengths of lambda=20/13 and 6/3 cm with the ATCA 6 km array. With these configurations, we achieved a resolution of ~2" at 3 cm which is sufficient to resolve the jet-like structure of ~3' length detected at 20 cm. From our new high resolution images at 6 and 3 cm we confirm the presence of a double jet structure, most likely originating from the northern galaxy (ESO295-IG022-N), bent and twisted towards the south. We found the spectral index of the jet to be very steep (alpha=-1.32). No point source was detected that could be associated with the core of ESO 295-IG022-N. On the other hand, ESO 295-IG022-S does not show any jet structure, but does show a point radio source. This source has variable flux and spectral index, and appears to be superposed on the line-of-sight of the jets (seen at 20-cm) originating from the northern galaxy ESO 295-IG022-N. Finally, regions of very high and somewhat well ordered polarisation were detected at the level of 70%.
description: Eight pages, Six figures, accepted for publication in the Serbian Astronomical Journal
Constraining a one-dimensional wave-type gravitational wave parameter through the shadow of M87* via Event Horizon Telescope
Creators: name: Pantig, Reggie C.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: During the glorious success of the EHT in providing the first image of a black hole, numerous papers have been published about the effect of different astrophysical environments on black hole geometry. Motivated by the work on how gravitational wave affects the shadow of a Schwarzschild black hole [Eur. Phys. J. C 10.1140/epjc/s10052-021-09287-2], we extend it by considering a quantum correction on the black hole through the extended uncertainty principle (EUP). Along with this correction, we probe the gravitational wave's effect on the null geodesics, and photonsphere, and find constraints to the gravitational wave parameter $ε$ using the black hole shadow of M87* for some given test value for the gravitational wave frequency $σ$. Not only that some nodes were found in the light trajectory, but the general behavior of paths changes in a periodic way as the time $t$ progresses. These patterns then confirm the chaotic formation of the shadow seen by some remote observer. Finally, the constraint that we find for $ε$ is $~10^{-10}$ orders of magnitude for the effect of the gravitational wave to be seen at a distance of $D = 16.8$ Mpc. As a consequence of such a value for $ε$, another result reveals that while there is are gravitational wave effect on the shadow perceived at $D$, the deviations on the photonsphere are nearly non-existent. Apart from Earth-based detectors for gravitational waves, the study implies the possibility of an alternative detection method especially if a gravitational wave source is near a lone black hole.
description: 10 pages, 6 figures
Orthologic with Axioms
Creators: name: Guilloud, Simon
name: Kuncak, Viktor
Publisher: name: arXiv
Year: 2023
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Logic (math.LO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We study the proof theory and algorithms for orthologic, a logical system based on ortholattices, which have shown practical relevance in simplification and normalization of verification conditions. Ortholattices weaken Boolean algebras while having polynomial-time equivalence checking that is sound with respect to Boolean algebra semantics. We generalize ortholattice reasoning and obtain an algorithm for proving a larger class of classically valid formulas.
 As the key result, we analyze a proof system for orthologic augmented with axioms. An important feature of the system is that it limits the number of formulas in a sequent to at most two, which makes the extension with axioms non-trivial. We show a generalized form of cut elimination for this system, which implies a sub-formula property. From there we derive a cubic-time algorithm for provability from axioms, or equivalently, for validity in finitely presented ortholattices. We further show that propositional resolution of width 5 proves all formulas provable in orthologic with axioms. We show that orthologic system subsumes resolution of width 2 and arbitrarily wide unit resolution and is complete for reasoning about generalizations of propositional Horn clauses.
 Moving beyond ground axioms, we introduce effectively propositional orthologic, presenting its semantics as well as a sound and complete proof system. Our proof system implies the decidability of effectively propositional orthologic, as well as its fixed-parameter tractability for a bounded maximal number of variables in each axiom. As a special case, we obtain a generalization of Datalog with negation and disjunction.
Pass-through Mach-Zehnder topologies for macroscopic quantum measurements
Creators: name: Khalili, F. Ya.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Several relatively small-scale experimental setups aimed on prototyping of future laser gravitational-wave detectors and testing of new methods of quantum measurements with macroscopic mechanical objects, are under development now. In these devices, not devoted directly to the gravitational-wave detection, Mach-Zehnder interferometer with pass-through Fabry-Perot cavities in the arms can be used instead of the standard Michelson/Fabry-Perot one. The advantage of this topology is that it does not contain high-reflectivity end mirrors with multilayer coatings, which Brownian noise could constitute the major part of the noise budget of the Michelson/Fabry-Perot interferometers. We consider here two variants of this topology: the "ordinary" position meter scheme, and a new variant of the quantum speed meter.
description: 11 pages, 9 figures
Transcutaneous pO2 imaging during tourniquet-induced forearm ischemia using planar optical oxygen sensors
Creators: name: Babilas, Philipp
name: Lamby, Philipp
name: Prantl, Lukas
name: Schreml, Stephan
name: Jung, Ernst-Michael
name: Liebsch, Gregor
name: Wolfbeis, Otto S.
name: Landthaler, Michael
name: Szeimies, Rolf-Markus
name: Abels, Christoph
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: microcirculation; luminescence lifetime imaging; two-dimensional; Clark electrode
subject: 540 Chemie

description: Background: Oxygen-dependent quenching of luminescence using transparent planar sensor foils was shown to overcome the limitations of the polarographic electrode technique in an animal model. This method was then transferred to a clinical setting to measure the transcutaneous pO2 (ptcO2). Methods: In six healthy subjects, a cuff on the upper arm was occluded up to 20 mmHg above systolic pressure and released after 8 min. PtcO2 was measured at the lower arm every 30 s before, during, and up to 20 min after cuff occlusion (40 °C applied skin temperature) using luminescence lifetime imaging (LLI) of platinum(II)-octaethyl-porphyrin immobilized in a polystyrene matrix. For validation, the polarographic Clark electrode technique was applied in close proximity, and measurements were conducted simultaneously. Results: PtcO2 measurements before (70.8±19.1 vs. 66.2±7.7 mmHg) and at the end of ischemic (2.7±1.2 vs. 3.6±1.7 mmHg) and reperfusion phases (72.2±3.6 vs. 68.4±8.9 mmHg) did not differ significantly using the Clark electrode vs. LLI. At both the initial ischemic and the reperfusion phases, the Clark electrode measured a faster decrease or increase, respectively, in ptcO2 because of the oxygen consumption occurring in this method. Conclusion: The presented method provides accurate and reproducible ptcO2 values under changing microcirculatory conditions. The lack of oxygen consumption during measurement allows both a more realistic estimation of ptcO2 than compared with the gold standard and permanent use in regions with critical oxygen supply.
A Fluorescent Probe for Diacetyl Detection
Creators: name: Li, Xiaohua
name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: Fluorescent probe - Rhodamine B hydrazide - Diacetyl - Cell medium
subject: 540 Chemie

description: A water-soluble fluorescent probe, rhodamine B hydrazide (RBH), was prepared and its properties for recognition of diacetyl were studied. The method employs the reaction of diacetyl with RBH, a colorless and non-fluorescent rhodamine B spiro form derivative to give a pink-colored fluorescent substance. In weakly acidic media, RBH reacts more selectively with diacetyl than with other carbonyls, causing a large increase in fluorescence intensity and thereby providing an easy assay for the determination of diacetyl.
Quantum Kernel Alignment with Stochastic Gradient Descent
Creators: name: Gentinetta, Gian
name: Sutter, David
name: Zoufal, Christa
name: Fuller, Bryce
name: Woerner, Stefan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Quantum support vector machines have the potential to achieve a quantum speedup for solving certain machine learning problems. The key challenge for doing so is finding good quantum kernels for a given data set -- a task called kernel alignment. In this paper we study this problem using the Pegasos algorithm, which is an algorithm that uses stochastic gradient descent to solve the support vector machine optimization problem. We extend Pegasos to the quantum case and and demonstrate its effectiveness for kernel alignment. Unlike previous work which performs kernel alignment by training a QSVM within an outer optimization loop, we show that using Pegasos it is possible to simultaneously train the support vector machine and align the kernel. Our experiments show that this approach is capable of aligning quantum feature maps with high accuracy, and outperforms existing quantum kernel alignment techniques. Specifically, we demonstrate that Pegasos is particularly effective for non-stationary data, which is an important challenge in real-world applications.
description: 10 pages, 4 figures
Library Automation
Creators: name: Saha, Rana Saha
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Library Automation
subject: Library Automation
subject: Software
subject: Library software
subject: Digital library
subject: Virtual library
subject: Online library

description: Discuss Library automation and LMS software details. Describe different types of Library like digital, virtual, online etc...
Comparison of a Nucleosidic vs Non-Nucleosidic Postsynthetic “Click” Modification of DNA with Base-Labile Fluorescent Probes
Creators: name: Berndl, Sina
name: Herzig, Nadine
name: Kele, Péter
name: Lachmann, Daniel
name: Li, Xiaohua
name: Wolfbeis, Otto S.
name: Wagenknecht, Hans-Achim
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 540 Chemie

description: The azides 1 and 2 bearing a phenoxazinium and a coumarin fluorophore, respectively, were applied in postsynthetic “click”-type bioconjugation and coupled to oligonucleotides modified with alkyne groups using two alternative approaches: (i) as a nucleotide modification at the 2′-position of uridine and (ii) as a nucleotide substitution using (S)-(−)-3-amino-1,2-propanediol as an acyclic linker between the phosphodiester bridges. The corresponding alkynylated phosporamidites 3 and 6 were used as DNA building blocks for the preparation of alkyne-bearing DNA duplexes. The base pairs adjacent to the site of modification and the base opposite to it were varied in the DNA sequences. The modified duplexes were investigated by UV/vis absorption spectroscopy (including melting temperatures) and fluorescence spectroscopy in order to study the different optical properties of the two chromophores and to evaluate their potential for bioanalytical applications. The sequence-selective fluorescence quenching of phenoxazinium 1 differs only slightly and does not depend on the type of modification, meaning whether it has been attached to the 2′-position of uridine or as DNA base surrogate using the acyclic glycol linker. The 2′-chromophore-modified uridine still recognizes adenine as the counterbase, and the duplexes exhibit a sufficient thermal stability that is comparable to that of unmodified duplexes. Thus, the application of the 2′-modification site of uridine is preferred in comparison to glycol-assisted DNA base surrogates. Accordingly, the coumarin dye azide 2 was attached only to the 2′-position of uridine. The significant Stokes shift of 100 nm and the good quantum yields make the coumarin chromophore a powerful fluorescent label for nucleic acids.
Teleportation-based realization of an optical quantum two-qubit entangling gate
Creators: name: Gao, Wei-Bo
name: Goebel, Alexander M.
name: Lu, Chao-Yang
name: Dai, Han-Ning
name: Wagenknecht, Claudia
name: Zhang, Qiang
name: Zhao, Bo
name: Peng, Cheng-Zhi
name: Chen, Zeng-Bing
name: Chen, Yu-Ao
name: Pan, Jian-Wei
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In recent years, there has been heightened interest in quantum teleportation, which allows for the transfer of unknown quantum states over arbitrary distances. Quantum teleportation not only serves as an essential ingredient in long-distance quantum communication, but also provides enabling technologies for practical quantum computation. Of particular interest is the scheme proposed by Gottesman and Chuang [Nature \textbf{402}, 390 (1999)], showing that quantum gates can be implemented by teleporting qubits with the help of some special entangled states. Therefore, the construction of a quantum computer can be simply based on some multi-particle entangled states, Bell state measurements and single-qubit operations. The feasibility of this scheme relaxes experimental constraints on realizing universal quantum computation. Using two different methods we demonstrate the smallest non-trivial module in such a scheme---a teleportation-based quantum entangling gate for two different photonic qubits. One uses a high-fidelity six-photon interferometer to realize controlled-NOT gates and the other uses four-photon hyper-entanglement to realize controlled-Phase gates. The results clearly demonstrate the working principles and the entangling capability of the gates. Our experiment represents an important step towards the realization of practical quantum computers and could lead to many further applications in linear optics quantum information processing.
description: 10 pages, 6 figures
Stationary states in single-well potentials under symmetric Levy noises
Creators: name: Dybiec, Bartlomiej
name: Sokolov, Igor M.
name: Chechkin, Aleksei V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We discuss the existence of stationary states for subharmonic potentials $V(x) \propto |x|^c$, $c<2$, under action of symmetric $α$-stable noises. We show analytically that the necessary condition for the existence of the steady state is $c>2-α$. These states are characterized by heavy-tailed probability density functions which decay as $P(x) \propto x^{-(c+α-1)}$ for $|x| \to \infty$, i.e. stationary states posses a heavier tail than the corresponding $α$-stable law. Monte Carlo simulations confirm the existence of such stationary states and the form of the tails of corresponding probability densities.
description: 9 pages, 8 figures.
Application of quantum-inspired generative models to small molecular datasets
Creators: name: Moussa, C.
name: Wang, H.
name: Araya-Polo, M.
name: Bäck, T.
name: Dunjko, V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Quantum and quantum-inspired machine learning has emerged as a promising and challenging research field due to the increased popularity of quantum computing, especially with near-term devices. Theoretical contributions point toward generative modeling as a promising direction to realize the first examples of real-world quantum advantages from these technologies. A few empirical studies also demonstrate such potential, especially when considering quantum-inspired models based on tensor networks. In this work, we apply tensor-network-based generative models to the problem of molecular discovery. In our approach, we utilize two small molecular datasets: a subset of $4989$ molecules from the QM9 dataset and a small in-house dataset of $516$ validated antioxidants from TotalEnergies. We compare several tensor network models against a generative adversarial network using different sample-based metrics, which reflect their learning performances on each task, and multiobjective performances using $3$ relevant molecular metrics per task. We also combined the output of the models and demonstrate empirically that such a combination can be beneficial, advocating for the unification of classical and quantum(-inspired) generative learning.
description: First version
"We are trans women" : on-street sex work and transgender politics in Mexico City
Creators: name: Gómez-Ramírez, Oralia
Publisher: name: University of British Columbia
Year: 2017

description: This dissertation is a feminist ethnography about on-street sex work and transgender politics in contemporary Mexico. It focuses on the socioeconomic and symbolic tensions existing between trans activists and trans vendors, mostly of sexual services, in Mexico City. It is based on ethnographic research consisting of participant-observation, formal interviews, informal conversations, and travel companionships with low-income female-gendered transpeople and self-identified trans activists in places of work, homes, social gatherings, and activist events about sexual diversity. The fieldwork for this study was conducted between 2010 and 2011, with shorter research periods spanning 2009 to 2014. The research also draws on bill proposals and official stenographic transcripts of socio-legal discussions held in Mexico City’s Legislative Assembly between 2001 and 2013. This study shows that, while not all transpeople are sex workers, a sizeable number of low-income trans women work as sexual labourers on the streets of Mexico City. Trans women have gained increasing visibility in on-street sex trade areas. Impoverished transpeople suffer the symbolic and material expressions of a generalized disrespect and disregard affecting on-street sex workers and low-income female-gendered transpeople. A sexual labour framework is thus critical to understand the ways in which social class and informal on-street vending shape the circumstances, livelihoods, and aspirations of low-income trans women. Their daily realities are shaped but not subsumed or exhausted by gender expressions and subjectivities or sex–gender systems alone. A class and labour lens, in addition to a gender lens, is necessary to shed light on the often-overlooked dimensions of socioeconomic standing and employment background that frame the lives of trans activists and trans sex workers. This project applies an intersecting critical trans and sexual labour analysis to understand the socioeconomic concerns and livelihoods of female-gendered transpeople. It contributes to the ethnographies of Mexico by underscoring regional and class diversity in the experiences and circumstances facing Mexicans. Lastly, this work helps refine feminist anthropology by demonstrating the utility of classic concepts to understand shifting intersecting realities and, more broadly, by refusing to conflate trans and sex work issues in Mexico with those found in other contexts.
Copyright for education: a case study of Palestine
Creators: name: Al-Tamimi, Rawan
Publisher: name: Australian Catholic University
Year: 2018

description: Palestine is a poor and disrupted territory and education is vital to its future prosperity and wellbeing. Copyright—which regulates access to information—can at times have a negative effect on education; even more so in least developed countries like Palestine. The aim of this thesis is to explain how copyright and education can function more effectively in the Palestinian context to bring about transformational change and meaningful development. To this end, the thesis (after explaining the Palestinian legal and social context) highlights the common ground between copyright and education and challenges them to work together, rather than against each other. It analyses copyright law in Palestine and how it might be reformed to provide better educational outcomes. Acknowledging that law reform is difficult to achieve, the thesis suggests that a more pragmatic and viable option is to employ strategic copyright management, or what is known as voluntary mechanisms (meaning the copyright owner agrees for various reasons to their material being shared through open access). In outlining this option the thesis provides a detailed roadmap for how Palestine can reap the rewards of voluntary mechanisms.
Ultra-high Q whispering-gallery-mode bottle microresonators: properties and applications
Creators: name: O'Shea, D.
name: Junge, C.
name: Nickel, S.
name: Poellinger, M.
name: Rauschenbeutel, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Highly prolate-shaped whispering-gallery-mode "bottle microresonators" have recently attracted considerable attention due to their advantageous properties. We experimentally show that such resonators offer ultra-high quality factors, microscopic mode volumes, and near lossless in- and out-coupling of light using ultra-thin optical fibers. Additionally, bottle microresonators have a simple and customizable mode structure. This enables full tunability using mechanical strain and simultaneous coupling of two ultra-thin coupling fibers in an add-drop configuration. We present two applications based on these characteristics: In a cavity quantum electrodynamics experiment, we actively stabilize the frequency of the bottle microresonator to an atomic transition and operate it in an ultra-high vacuum environment in order to couple single laser-cooled atoms to the resonator mode. In a second experiment, we show that the bottle microresonator can be used as a low-loss, narrow-band add-drop filter. Using the Kerr effect of the silica resonator material, we furthermore demonstrate that this device can be used for single-wavelength all-optical signal processing.
description: 11 pages, 8 figures