cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Investigation of second harmonic generation and multispectral imaging as new contrast mechanisms in scanning laser optical tomography
Creators: name: Nolte, Lena
name: Antonopoulos, Georgios C.
name: Heisterkamp, Alexander
name: Ripken, Tammo
name: Meyer, Heiko
Publisher: name: Bellingham, WA : S P I E - International Society for Optical Engineering
Year: 2018
Subjects: subject: 3D Microscopy
subject: Multispectral imaging
subject: Nonlinear Optics
subject: Scanning Laser Optical Tomography
subject: Second Harmonic Generation
subject: Spectral unmixing
subject: Tomographic imaging
subject: Biological materials
subject: Computerized tomography
subject: Harmonic analysis
subject: Image acquisition
subject: Image reconstruction
subject: Light sources
subject: Nonlinear optics
subject: Optical tomography
subject: Scanning
subject: 3-D microscopy
subject: Scanning lasers
subject: Harmonic generation
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: Scanning laser optical tomography (SLOT) is a 3D imaging technique, based on the principle of computed tomography to visualize samples up to magnitude of several centimeters. Intrinsic contrast mechanisms as absorption, scattering and autofluorescence provide information about the 3D architecture and composition of the sample. Another valuable intrinsic contrast mechanism is second harmonic generation (SHG), which is generated in noncentrosymmetric materials and commonly used to image collagen in biological samples. The angular dependence of the SHG signal, however, produces artifacts in reconstructed optical tomography datasets (OPT, SLOT). Thus, successful use of this intrinsic contrast mechanism is impaired. We investigate these artifacts by simulation and experiment and propose an elimination procedure that enables successful reconstruction of SHG-SLOT data. Nevertheless, in many cases specific labeling of certain structures is necessary to make them visible. Using multiple dyes in one sample can lead to crosstalk between the different channels and reduce contrast of the images. Also autofluorescence of the sample itself can account for that. By using multispectral imaging in combination with spectral unmixing techniques, this loss can be compensated. Therefore either a spectrally resolved detection path, or spectrally resolved excitation is required. Therefore we integrated a white supercontinuum light source in our SLOT-setup that enables a spectral selection of the excitation beam and extended the detection path to a four channel setup. This enables the detection of three fluorescence channels and one absorption channel in parallel, and increases the contrast in the reconstructed 3D images significantly. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.
Sensitive Ants for Denial Jamming Attack on Wireless Sensor Network
Creators: name: Pintea, Camelia-M.
name: Pop, Petrica C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cryptography and Security (cs.CR)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: A new defence mechanism for different jamming attack on Wireless Sensor Network (WSN) based on ant system it is introduced. The artificial sensitive ants react on network attacks in particular based on their sensitivity level. The information is re-directed from the attacked node to its appropriate destination node. It is analyzed how are detected and isolated the jamming attacks with mobile agents in general and in particular with the newly ant-based sensitive approach.
description: - 4 pages - accepted paper
Quantum-Limited Mirror-Motion Estimation
Creators: name: Iwasawa, Kohjiro
name: Makino, Kenzo
name: Yonezawa, Hidehiro
name: Tsang, Mankei
name: Davidovic, Aleksandar
name: Huntington, Elanor
name: Furusawa, Akira
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We experimentally demonstrate optomechanical motion and force measurements near the quantum precision limits set by the quantum Cramér-Rao bounds (QCRBs). Optical beams in coherent and phase-squeezed states are used to measure the motion of a mirror under an external stochastic force. Utilizing optical phase tracking and quantum smoothing techniques, we achieve position, momentum, and force estimation accuracies close to the QCRBs with the coherent state, while estimation using squeezed states shows clear quantum enhancements beyond the coherent-state bounds.
title: Baargeld illustriert Apollinaire
Creators: name: Schmidt-Burkhardt, Astrid
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 15, Nr. 3/4 (1987): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
On the $A_\infty$ condition for elliptic operators in 1-sided NTA domains satisfying the capacity density condition.
Creators: name: Cao, Mingming
name: Dominguez, Oscar
name: Martell, José María
name: Tradacete, Pedro
Publisher: name: Zenodo
Year: 2022

description: Let $\Omega \subset \mathbb{R}^{n+1}$, $n\ge 2$, be a $1$-sided non-tangentially accessible domain, that is, a set which is quantitatively open and path-connected. Assume also that $\Omega$ satisfies the capacity density condition. Let $L_0 u=-\div(A_0 \nabla u)$,  $Lu=-\div(A\nabla u)$ be two real (not necessarily symmetric) uniformly elliptic operators in $\Omega$, and write $\omega_{L_0}, \omega_L$ for the respective associated elliptic measures. We establish the equivalence between  the following properties: (i) $\omega_L \in A_{\infty}(\omega_{L_0})$, (ii) $L$ is $L^p(\omega_{L_0})$-solvable for some $p\in (1,\infty)$, (iii) bounded null solutions of $L$ satisfy Carleson measure estimates with respect to $\omega_{L_0}$, (iv) $\mathcal{S}<\mathcal{N}$ (i.e., the conical square function is controlled by the non-tangential maximal function) in $L^q(\omega_{L_0})$ for some (or for all) $q\in (0,\infty)$ for any null solution of $L$, and (v) $L$ is $\mathrm{BMO}(\omega_{L_0})$-solvable. Moreover, in each of the properties (ii)-(v) it is enough to consider the class of solutions given by characteristic functions of Borel sets (i.e, $u(X)=\omega_L^X(S)$ for an arbitrary Borel set $S\subset\pom$).

Also, we obtain a qualitative analog of the previous equivalences. Namely, we characterize the absolute continuity of $\omega_{L_0}$ with respect to $\omega_L$ in terms of some qualitative local $L^2(\omega_{L_0})$ estimates for the truncated conical square function for any bounded null solution of $L$. This is also equivalent to the finiteness $\omega_{L_0}$-almost everywhere of the truncated conical square function for any bounded null solution of $L$.  As applications, we show that $\omega_{L_0}$ is absolutely continuous with respect to $\omega_L$ if the disagreement of the coefficients satisfies some qualitative quadratic estimate in truncated cones for $\omega_{L_0}$-almost everywhere vertex. Finally, when $L_0$ is either the transpose of $L$ or its symmetric part, we obtain the corresponding absolute continuity upon assuming that the antisymmetric part of the coefficients has some controlled oscillation in truncated cones for $\omega_{L_0}$-almost every vertex.
The Role of User Reviews in App Updates: A Preliminary Investigation on App Release Notes
Creators: name: Wang, Chong
name: Liu, Tianyang
name: Liang, Peng
name: Daneva, Maya
name: van Sinderen, Marten
Publisher: name: arXiv
Year: 2022
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Release planning for mobile apps has recently become an area of active research. Prior research in this area concentrated on the analysis of release notes and on tracking user reviews to support app evolution with issue trackers. However, little is known about the impact of user reviews on the evolution of mobile apps. Our work explores the role of user reviews in app updates based on release notes. For this purpose, we collected user reviews and release notes of Spotify, the 'number one' app in the 'Music' category in Apple App Store, as the research data. Then, we manually removed non-informative parts of each release note, and manually determined the relevance of the app reviews with respect to the release notes. We did this by using Word2Vec calculation techniques based on the top 80 app release notes with the highest similarities. Our empirical results show that more than 60% of the matched reviews are actually irrelevant to the corresponding release notes. When zooming in at these relevant user reviews, we found that around half of them were posted before the new release and referred to requests, suggestions, and complaints. Whereas, the other half of the relevant user reviews were posted after updating the apps and concentrated more on bug reports and praise.
description: 6 pages, 2 figures. Chong Wang and Tianyang Liu contribute equally
title: Kunsthistorikerinnen - ein Thema für die Wissenschaftsgeschichte
Creators: name: Hofner-Kulenkamp, Gabriele
name: Lange, Barbara
name: Paul, Barbara
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 22, Nr. 4 (1994): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Role of Van der Waals forces in graphene adsorption over Pd, Pt and Ni
Creators: name: Quiroga, Matias Abel Oscar
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report ab initiocomputations with the Vienna ab Initio Simulation Package (VASP) aimed at elucidating the adsorption mechanism of graphene-like structures on (111) Pd, Pt, and Ni surfaces. To study the adsorption properties, we simulate an already-formed graphene layer. We present a comparative discussion of the graphene interactions with the three metals, focusing on the very particular adsorption of graphene over Pd.
description: accept 2013 accept for publication in Volume 43 of the Brazilian Journal of Physics
title: Kurze Zusammenfassung der Abschlußdiskussion
Creators: name: Paul, Barbara
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 26, Nr. 3 (1998): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Laser-induced degradation and damage morphology in polymer optical fibers
Creators: name: Kiedrowski, K.
name: Jakobs, F.
name: Kielhorn, J.
name: Johannes, H.-H.
name: Kowalsky, W.
name: Kracht, D.
name: Balasa, I.
name: Ristau, D.
Publisher: name: Bellingham : SPIE
Year: 2020
Subjects: subject: Active POF
subject: Integrated photonics
subject: Laser damage
subject: PMMA
subject: Polymer optical fiber
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The radiation of pulsed laser systems can generate changes in various materials. On the one hand, these modifications can be used for a variety of applications i.e. laser welding, cutting and many more [1]. The precision and quality depends on the material and laser parameters. On the other hand, material changes are not always desired in other applications. When using optical materials such as optical fibers as a light guide or as a sensor, laser-induced damage effects inside the fiber are to be prevented to ensure constant light guidance and the reliable monitoring of a desired parameter. Therefore, investigations for quality assurance need to be performed. For this reason, this work investigates laserinduced damage in polymer optical fibers (POF) using a nanosecond pulsed laser system at a wavelength of 532 nm. The impact of different laser and fiber parameters on the long-term degradation behavior is observed. In addition, the overall degradation behavior as well as the knowledge gained by analyzing the damage morphology and distribution will be used to obtain a better understanding of the damage mechanisms.
The evaluation of Japanese universities through online English president messages
Creators: name: Nagashima, Lyndell
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: This research thesis examines Japanese university online messages written by university presidents (hereafter ‘president messages’). The dataset comprises four English-language messages selected from elite institutions within the Top Global Project (a project of the Japanese Government that identifies the ‘top’ universities in Japan), and organised according to QS University Ranking: 1. University of Tokyo, 2. Kyoto University, 3. Hokkaido University, and 4. University of Tsukuba. The president messages encapsulate the universities’ English-language online presence, and face, to the international community. The appraisal resource of ATTITUDE (Martin & White, 2005) from Systemic Functional Linguistics (SFL) is used to analyse the dataset in order to understand how the messages function in the Japanese social context. The three types of ATTITUDE are incorporated in this study: judgement to assess behavioural standards; appreciation to determine item values; and affect which are emotional reactions. The dataset predominantly exhibits judgement and appreciation resources, and affect with limited frequency. The findings reveal how these elite Japanese universities are positively construed according to appraisal types within each category. While not widespread in Japanese public discourse, international concepts of innovative academia, diversity, and an international focus on contributing to the well-being of humankind beyond Japan are pervasive in the president messages. It is proposed that the messages are possibly appealing to an international audience as opposed to a Japanese audience by excluding traditional educational values in Japan. It is found that, following the discourse trends of universities worldwide, internationalisation, globalisation and marketisation discourse is evident in these Japanese universities’ president messages.
A Physical Link Between Jet Formation and Hot Plasma in Active Galactic Nuclei
Creators: name: Wu, Qingwen
name: Cao, Xinwu
name: Ho, Luis C.
name: Wang, Ding-Xiong
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recent observations suggest that in black hole X-ray binaries jet/outflow formation is related to the hot plasma in the vicinity of the black hole, either in the form of an advection-dominated accretion flow at low accretion rates or in a disk corona at high accretion rates. We test the viability of this scenario for supermassive black holes using two samples of active galactic nuclei distinguished by the presence (radio-strong) and absence (radio-weak) of well-collimated, relativistic jets. Each is centered on a narrow range of black hole mass but spans a very broad range of Eddington ratios, effectively simulating, in a statistical manner, the behavior of a single black hole evolving across a wide spread in accretion states. Unlike the relationship between the radio and optical luminosity, which shows an abruptly break between high- and low-luminosity sources at an Eddington ratio of ~1, the radio emission-a measure of the jet power-varies continuously with the hard X-ray (2-10 keV) luminosity, roughly as L_R \propto L_X^(0.6-0.75). This relation, which holds for both radio-weak and radio-strong active galaxies, is similar to the one seen in X-ray binaries. Jet/outflow formation appears to be closely linked to the conditions that give rise to the hot, optically thin coronal emission associated with accretion flows, both in the regime of low and high accretion rates.
description: Accepted by ApJ, 8 pages, 3 figures
On the Algebraic Foundation of the Mandelbulb
Creators: name: Boily, Vanessa
name: Rochon, Dominic
Publisher: name: arXiv
Year: 2022
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 32A30, 30G35, 00A69

description: In this paper, we generalize the Mandelbrot set using quaternions and spherical coordinates. In particular, we use pure quaternions to define a spherical product. This product, which is inspired by the product of complex numbers, add the angles and multiply the radii of the spherical coordinates. We show that the algebraic structure of pure quaternions with the spherical product is a commutative unital magma. Then, we present several generalizations of the Mandelbrot set. Among them, we present a set that is visually identical to the so-called Mandelbulb. We show that this set is bounded and that it can be generated by an escape time algorithm. We also define another generalization, the bulbic Mandelbrot set. We show that one of its 2D cuts has the same dynamics as the Mandelbrot set and that we can generate this set only with a quaternionic product, without using the spherical product.
description: 24 pages, 27 images
Investigation on spectral behavior of Solar Transients and their Interrelationship
Creators: name: Tripathi, Sharad C
name: Khan, Parvaiz A
name: M, Aslam A
name: Gwal, A K
name: Purohit, P K
name: Jain, Rajmal
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We probe the spectral hardening of solar flares emission in view of associated solar proton events (SEPs) at earth and coronal mass ejection (CME) acceleration as a consequence. In this investigation we undertake 60 SEPs of the Solar Cycle 23 alongwith associated Solar Flares and CMEs. We employ the X-ray emission in Solar flares observed by Reuven Ramaty Higly Energy Solar Spectroscopic Imager (RHESSI) in order to estimate flare plasma parameters. Further, we employ the observations from Geo-stationary Operational Environmental Satellites (GOES) and Large Angle and Spectrometric Coronagraph (LASCO), for SEPs and CMEs parameter estimation respectively. We report a good association of soft-hard-harder (SHH) spectral behavior of Flares with occurrence of Solar Proton Events for 16 Events (observed by RHESSI associated with protons). In addition, we have found a good correlation (R=0.71) in SEPs spectral hardening and CME velocity. We conclude that the Protons as well as CMEs gets accelerated at the Flare site and travel all the way in interplanetary space and then by re-acceleration in interplanetary space CMEs produce Geomagnetic Storms in geospace. This seems to be a statistically significant mechanism of the SEPs and initial CME acceleration in addition to the standard scenario of SEP acceleration at the shock front of CMEs.
description: accepted for publication (12 pages, 5 figures, 2 tables), published in Astrophysics and Space Science, 2013
Hydrogels for light delivery in in vivo optogenetic applications
Creators: name: Johannsmeier, Sonja
name: Torres-Mapa, Maria L.
name: Ripken, Tammo
name: Heinemann, Dag
name: Heisterkamp, Alexander
Publisher: name: Bellingham : SPIE
Year: 2019
Subjects: subject: Diffusor
subject: Hydrogel waveguide
subject: Light delivery
subject: Optogenetics
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Biocompatible hydrogels present interesting opportunities for in vivo waveguiding for optogenetic or photomedical applications. Here, we investigate the applicability of poly(ethylene glycol) diacrylate hydrogels in combination with scattering particles as optical diffusors. Gel characteristics and bioactivity can be tuned to achieve controlled light distribution and tissue interaction.
Experimental observation of spin-split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures
Creators: name: Tiwari, Priya
name: Jat, Mohit Kumar
name: Udupa, Adithi
name: Narang, Deepa S.
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Sen, Diptiman
name: Bid, Aveek
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Proximity-induced spin-orbit coupling in graphene has led to the observation of intriguing phenomena like time-reversal invariant $\mathbb{Z}_2$ topological phase and spin-orbital filtering effects. An understanding of the effect of spin-orbit coupling on the band structure of graphene is essential if these exciting observations are to be transformed into real-world applications. In this research article, we report the experimental determination of the band structure of single-layer graphene (SLG) in the presence of strong proximity-induced spin-orbit coupling. We achieve this in high-mobility hBN-encapsulated SLG/WSe2 heterostructures through measurements of quantum oscillations. We observe clear spin-splitting of the graphene bands along with a substantial increase in the Fermi velocity. Using a theoretical model with realistic parameters to fit our experimental data, we uncover evidence of a band gap opening and band inversion in the SLG. Further, we establish that the deviation of the low-energy band structure from pristine SLG is determined primarily by the valley-Zeeman SOC and Rashba SOC, with the Kane-Mele SOC being inconsequential. Despite robust theoretical predictions and observations of band-splitting, a quantitative measure of the spin-splitting of the valence and the conduction bands and the consequent low-energy dispersion relation in SLG was missing -- our combined experimental and theoretical study fills this lacuna.
description: 27 pages
Integrated atomic quantum technologies in demanding environments: Development and qualification of miniaturized optical setups and integration technologies for UHV and space operation
Creators: name: Christ, M.
name: Kassner, A.
name: Smol, R.
name: Bawamia, A.
name: Peters, A.
name: Wurz, M.
name: Rasel, E.
name: Wicht, A.
name: Krutzik, M.
Publisher: name: Bellingham, Wash. : SPIE
Year: 2018
Subjects: subject: Adhesive
subject: Cold atoms
subject: Environmental testing
subject: Micro-integration
subject: Miniaturized optical setups
subject: Outgassing
subject: Qualification
subject: Quantum sensors
subject: Residual gas analysis
subject: Ultra-high vacuum
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Employing compact quantum sensors in field or in space (e.g., small satellites) implies demanding requirements on components and integration technologies. Within our work on integrated sensors, we develop miniaturized, ultra-stable optical setups for optical cooling and trapping of cold atomic gases. Besides challenging demands on alignment precision, and thermo-mechanical durability, we specifically address ultra-high vacuum (UHV) compatibility of our integration technologies and optical components. A prototype design of an UHV-compatible, crossed beam optical dipole trap setup and its application within a cold atomic quantum sensor is described. First qualification efforts on adhesive micro-integration technologies are presented. These tests are conducted in application-relevant geometries and material combinations common for micro-integrated optical setups. Adhesive aging will be investigated by thermal cycling or gamma radiation exposure. For vacuum compatibility testing, a versatile UHV testing system is currently being set up, enabling residual gas analysis and measurement of total gas rates down to 5•10-10mbar l/s at a base pressure of 10-11 mbar, exceeding the common ASTM E595 test.
A Black Hole Nova Obscured by an Inner Disk Torus
Creators: name: Corral-Santana, J. M.
name: Casares, J.
name: Muñoz-Darias, T.
name: Rodríguez-Gil, P.
name: Shahbaz, T.
name: Torres, M. A. P.
name: Zurita, C.
name: Tyndall, A. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Stellar-mass black holes (BHs) are mostly found in X-ray transients, a subclass of X-ray binaries that exhibit violent outbursts. None of the 50 Galactic BHs known show eclipses, which is surprising for a random distribution of inclinations. Swift J1357.2-0933 is a very faint X-ray transient detected in 2011. On the basis of spectroscopic evidence, we show that it contains a BH in a 2.8 h orbital period. Further, high-time resolution optical light curves display profound dips without X-ray counterparts. The observed properties are best explained by the presence of an obscuring toroidal structure moving outwards in the inner disk seen at very high inclination. This observational feature should play a key role in models of inner accretion flows and jet collimation mechanisms in stellar-mass BHs.
description: 23 pages (9 in the supplementary material), 6 figures (3 are supplementary figures). This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on Vol. 339 no. 6123 on 1 March 2013
Recent Advances in Scene Image Representation and Classification
Creators: name: Sitaula, Chiranjibi
name: Shahi, Tej Bahadur
name: Marzbanrad, Faezeh
name: Aryal, Jagannath
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: With the rise of deep learning algorithms nowadays, scene image representation methods have achieved a significant performance boost in classification. However, the performance is still limited because the scene images are mostly complex having higher intra-class dissimilarity and inter-class similarity problems. To deal with such problems, there have been several methods proposed in the literature with their advantages and limitations. A detailed study of previous works is necessary to understand their advantages and disadvantages in image representation and classification problems. In this paper, we review the existing scene image representation methods that are being widely used for image classification. For this, we, first, devise the taxonomy using the seminal existing methods proposed in the literature to this date {using deep learning (DL)-based, computer vision (CV)-based, and search engine (SE)-based methods}. Next, we compare their performance both qualitatively (e.g., quality of outputs, pros/cons, etc.) and quantitatively (e.g., accuracy). Last, we speculate on the prominent research directions in scene image representation tasks using {keyword growth and timeline analysis.} Overall, this survey provides in-depth insights and applications of recent scene image representation methods under three different methods.
description: This paper is under review in Multimedia Tools and Applications (Springer) journal. This article may be deleted or updated based on the policies of the journal
Suppression of Ion Transport due to Long-Lived Sub-Wavelength Localization by an Optical Lattice
Creators: name: Karpa, Leon
name: Bylinskii, Alexei
name: Gangloff, Dorian
name: Cetina, Marko
name: Vuletić, Vladan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We report the localization of an ion by a one-dimensional optical lattice in the presence of an applied external force. The ion is confined radially by a radiofrequency trap and axially by a combined electrostatic and optical-lattice potential. The ion is cooled using a resolved Raman sideband technique to a mean vibrational number = 0.6 \pm 0.1 along the optical lattice. We implement a detection method to monitor the position of the ion subject to a periodic electrical driving force with a resolution down to λ/40, and demonstrate suppression of the driven ion motion and localization to a single lattice site on time scales of up to 10 milliseconds. This opens new possibilities for studying many-body systems with long-range interactions in periodic potentials.
description: 5 pages, 4 figures
FPGA based laser frequency stabilization using FM spectroscopy
Creators: name: Spindeldreier, Christian
name: Bartosch, Wolfgang
name: Wendrich, Thijs
name: Rasel, Ernst Maria
name: Ertmer, Wolfgang
name: Blume, Holger
Publisher: name: Bellingham, Wash. : SPIE
Year: 2018
Subjects: subject: absorption spectroscopy
subject: distributed feedback laser
subject: FPGA
subject: frequency control
subject: frequency stabilization
subject: optical spectrum
subject: signal recognition
subject: System on Chip
subject: Absorption spectroscopy
subject: Controllers
subject: Digital filters
subject: Distributed feedback lasers
subject: Electric current control
subject: Electric frequency control
subject: Energy utilization
subject: Field programmable gate arrays (FPGA)
subject: Frequency estimation
subject: Frequency stability
subject: Interferometry
subject: Laser resonators
subject: Pattern matching
subject: Programmable logic controllers
subject: Resonators
subject: Space platforms
subject: Stabilization
subject: System-on-chip
subject: Frequency controllers
subject: Frequency estimators
subject: Frequency stabilization
subject: Laser frequency stabilization
subject: Long term frequency stability
subject: Low energy consumption
subject: Optical spectra
subject: Signal recognition
subject: Frequency modulation
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Frequency stabilized light sources with narrow linewidth are mandatory for atom interferometry based experiments. For compact experiment designs used on space platforms, tunable DFB diode lasers are often used. These lasers combine low energy consumption with small sizes, but lack long-term frequency stability. This paper presents an FPGA based laser frequency stabilization system for highly variable target frequencies using frequency modulated Rb-spectroscopy achieving latencies below 100 μs. The system consists of a DFB laser, a Rb-spectroscopy cell, a laser current controller and an FPGA board with an analog-digital conversion board. The digital part of the frequency stabilization system is a SoC mapped on an FPGA. The SoC consists of a processor, enabling user interaction via network connection, and the dedicated frequency stabilization module. This module consists of a demodulation stage, digital filters, a frequency estimator and a controller. To estimate the frequency, small ramps of the laser frequency are generated using a high-speed DAC connected to the laser current controller. The absorption spectroscopy output of this beam is sampled using a photodiode and a high-speed ADC. After signal conditioning with digital filters, the frequency estimator extracts the present mid-frequency of the laser applying pattern matching with a prerecorded reference spectrum. The frequency controller adjusts the mean laser current based on this estimation. The performance as well as the accuracy of the proposed laser stabilization system and its FPGA resource and power consumption are evaluated.
Autoregressive based Drift Detection Method
Creators: name: Mayaki, Mansour Zoubeirou A
name: Riveill, Michel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In the classic machine learning framework, models are trained on historical data and used to predict future values. It is assumed that the data distribution does not change over time (stationarity). However, in real-world scenarios, the data generation process changes over time and the model has to adapt to the new incoming data. This phenomenon is known as concept drift and leads to a decrease in the predictive model's performance. In this study, we propose a new concept drift detection method based on autoregressive models called ADDM. This method can be integrated into any machine learning algorithm from deep neural networks to simple linear regression model. Our results show that this new concept drift detection method outperforms the state-of-the-art drift detection methods, both on synthetic data sets and real-world data sets. Our approach is theoretically guaranteed as well as empirical and effective for the detection of various concept drifts. In addition to the drift detector, we proposed a new method of concept drift adaptation based on the severity of the drift.
Mind the Gap: Norm-Aware Adaptive Robust Loss for Multivariate Least-Squares Problems
Creators: name: Hitchcox, Thomas
name: Forbes, James Richard
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Measurement outliers are unavoidable when solving real-world robot state estimation problems. A large family of robust loss functions (RLFs) exists to mitigate the effects of outliers, including newly developed adaptive methods that do not require parameter tuning. All of these methods assume that residuals follow a zero-mean Gaussian-like distribution. However, in multivariate problems the residual is often defined as a norm, and norms follow a Chi-like distribution with a non-zero mode value. This produces a "mode gap" that impacts the convergence rate and accuracy of existing RLFs. The proposed approach, "Adaptive MB," accounts for this gap by first estimating the mode of the residuals using an adaptive Chi-like distribution. Applying an existing adaptive weighting scheme only to residuals greater than the mode leads to more robust performance and faster convergence times in two fundamental state estimation problems, point cloud alignment and pose averaging.
description: 8 pages, 4 figures. This paper has been accepted for publication in IEEE Robotics and Automation Letters. V2: Update weighting in (13), (28) and re-run results. Hypothesis, methodology, and general findings remain unchanged. Update Sec. II-A to reference IRLS, and update citation [11] accordingly. Include acknowledgement to Mitchell Cohen. V3: Update Section II-A to least-squares
title: Paradigmenwechsel? Konzeptionen von Weiblichkeit bei Lucy R. Lippard und Linda Nochlin
Creators: name: Paul, Barbara
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 26, Nr. 3 (1998): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Finite-group gauge theories on lattices as Hamiltonian systems with constraints
Creators: name: de Resende, M. F. Araujo
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work, we present a brief but insightful overview of the gauge theories, which are defined on $ n $-dimensional lattices by using finite gauge groups, in order to show how they can be interpreted as a Hamiltonian system with constraints, analogous to what happens with the classical (continuous) gauge (field) theories. As this interpretation is not usually explored in the literature that discusses/introduces the concept of lattice gauge theory, but some recent works have been exploring Hamiltonian models in order to support some kind of quantum computation, we use this interpretation to, for example, present a brief geometric view of one class of these models: the Kitaev Quantum Double Models.
description: 26 pages, 6 figures; submitted to publication
Event-based Stereo Depth Estimation from Ego-motion using Ray Density Fusion
Creators: name: Ghosh, Suman
name: Gallego, Guillermo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Event cameras are bio-inspired sensors that mimic the human retina by responding to brightness changes in the scene. They generate asynchronous spike-based outputs at microsecond resolution, providing advantages over traditional cameras like high dynamic range, low motion blur and power efficiency. Most event-based stereo methods attempt to exploit the high temporal resolution of the camera and the simultaneity of events across cameras to establish matches and estimate depth. By contrast, this work investigates how to estimate depth from stereo event cameras without explicit data association by fusing back-projected ray densities, and demonstrates its effectiveness on head-mounted camera data, which is recorded in an egocentric fashion. Code and video are available at https://github.com/tub-rip/dvs_mcemvs
description: 6 pages, 3 figures, project page: https://github.com/tub-rip/dvs_mcemvs
title: Barbara Mikuda-Hüttel, Vom >Hausmann< zum Hausheiligen des Wiener Hofes. Zur Ikonographie des hl. Joseph im 17. und 18. Jahrhundert, Marburg 1997
Creators: name: Gensichen, Sigrid
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 27, Nr. 2 (1999): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood Through Precise Calibration of Saturated WISE Photometry
Creators: name: Patel, Rahul I.
name: Metchev, Stanimir A.
name: Heinze, Aren
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a sensitive search for WISE W3 (12um) and W4 (22um) excesses from warm optically thin dust around Hipparcos main sequence stars within 75pc from the Sun. We use contemporaneously measured photometry from WISE, remove sources of contamination, and derive and apply corrections to saturated fluxes to attain optimal sensitivity to >10um excesses. We use data from the WISE All-Sky Survey Catalog rather than the AllWISE release, because we find that its saturated photometry is better behaved, allowing us to detect small excesses even around saturated stars in WISE. Our new discoveries increase by 45% the number of stars with warm dusty excesses and expand the number of known debris disks (with excess at any wavelength) within 75pc by 29%. We identify 220 Hipparcos debris disk-host stars, 108 of which are new detections at any wavelength. We present the first measurement of a 12um and/or 22um excess for 10 stars with previously known cold (50-100 K) disks. We also find five new stars with small but significant W3 excesses, adding to the small population of known exozodi, and we detect evidence for a W2 excess around HIP96562 (F2V), indicative of tenuous hot (780 K) dust. As a result of our WISE study, the number of debris disks with known 10-30um excesses within 75pc (379) has now surpassed the number of disks with known >30um excesses (289, with 171 in common), even if the latter have been found to have a higher occurrence rate in unbiased samples.
description: Final version accepted by ApJ Supplements. 57 pages, including 8 tables + 37 figures
title: Kunsthistorische Gender Studies: geschichtliche Entwicklungen und aktuelle Perspektiven
Creators: name: Paul, Barbara
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 29, Nr. 4 (2001): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Die Entführung Hanns-Martin Schleyers oder die Entdeckung des Mediums Gesicht im terroristischen Bilderkampf
Creators: name: Klonk, Charlotte
Publisher: name: University Library Heidelberg
Year: 2014

description: kritische berichte - Zeitschrift für Kunst- und Kulturwissenschaften, Bd. 36, Nr. 2 (2008): kritische berichte, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
The merger fraction of active and inactive galaxies in the local Universe through an improved non-parametric classification
Creators: name: Cotini, Stefano
name: Ripamonti, Emanuele
name: Caccianiga, Alessandro
name: Colpi, Monica
name: Della Ceca, Roberto
name: Mapelli, Michela
name: Severgnini, Paola
name: Segreto, Alberto
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the possible link between mergers and the enhanced activity of supermassive black holes (SMBHs) at the centre of galaxies, by comparing the merger fraction of a local sample (0.003 =< z < 0.03) of active galaxies - 59 active galactic nuclei (AGN) host galaxies selected from the all-sky Swift BAT (Burst Alert Telescope) survey - with an appropriate control sample (247 sources extracted from the Hyperleda catalogue) that has the same redshift distribution as the BAT sample. We detect the interacting systems in the two samples on the basis of non-parametric structural indexes of concentration (C), asymmetry (A), clumpiness (S), Gini coefficient (G) and second order momentum of light (M20). In particular, we propose a new morphological criterion, based on a combination of all these indexes, that improves the identification of interacting systems. We also present a new software - PyCASSo (Python CAS Software) - for the automatic computation of the structural indexes. After correcting for the completeness and reliability of the method, we find that the fraction of interacting galaxies among the active population, 20(+7/-5) per cent, exceeds the merger fraction of the control sample, 4(+1.7/-1.2) per cent. Choosing a mass-matched control sample leads to equivalent results, although with slightly lower statistical significance. Our findings support the scenario in which mergers trigger the nuclear activity of supermassive black holes.
description: 17 pages, 6 figures, 4 tables, accepted for publication in MNRAS
title: Ein Wandgemälde der Schongauer Werkstatt in Upfingen (Kr. Münsingen)
Creators: name: Hoffmann, Herbert
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 3, Nr. 4 (1960): Nachrichtenblatt der Denkmalpflege in Baden-Württemberg – Organ der Staatlichen Ämter für Denkmalpflege, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
SoccerCPD: Formation and Role Change-Point Detection in Soccer Matches Using Spatiotemporal Tracking Data
Creators: name: Kim, Hyunsung
name: Kim, Bit
name: Chung, Dongwook
name: Yoon, Jinsung
name: Ko, Sang-Ki
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applications (stat.AP)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: 62P99

description: In fluid team sports such as soccer and basketball, analyzing team formation is one of the most intuitive ways to understand tactics from domain participants' point of view. However, existing approaches either assume that team formation is consistent throughout a match or assign formations frame-by-frame, which disagree with real situations. To tackle this issue, we propose a change-point detection framework named SoccerCPD that distinguishes tactically intended formation and role changes from temporary changes in soccer matches. We first assign roles to players frame-by-frame and perform two-step change-point detections: (1) formation change-point detection based on the sequence of role-adjacency matrices and (2) role change-point detection based on the sequence of role permutations. The evaluation of SoccerCPD using the ground truth annotated by domain experts shows that our method accurately detects the points of tactical changes and estimates the formation and role assignment per segment. Lastly, we introduce practical use-cases that domain participants can easily interpret and utilize.
RIO: Order-Preserving and CPU-Efficient Remote Storage Access
Creators: name: Liao, Xiaojian
name: Yang, Zhe
name: Shu, Jiwu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Operating Systems (cs.OS)
subject: FOS: Computer and information sciences

description: Modern NVMe SSDs and RDMA networks provide dramatically higher bandwidth and concurrency. Existing networked storage systems (e.g., NVMe over Fabrics) fail to fully exploit these new devices due to inefficient storage ordering guarantees. Severe synchronous execution for storage order in these systems stalls the CPU and I/O devices and lowers the CPU and I/O performance efficiency of the storage system. We present Rio, a new approach to the storage order of remote storage access. The key insight in Rio is that the layered design of the software stack, along with the concurrent and asynchronous network and storage devices, makes the storage stack conceptually similar to the CPU pipeline. Inspired by the CPU pipeline that executes out-of-order and commits in-order, Rio introduces the I/O pipeline that allows internal out-of-order and asynchronous execution for ordered write requests while offering intact external storage order to applications. Together with merging consecutive ordered requests, these design decisions make for write throughput and CPU efficiency close to that of orderless requests. We implement Rio in Linux NVMe over RDMA stack, and further build a file system named RioFS atop Rio. Evaluations show that Rio outperforms Linux NVMe over RDMA and a state-of-the-art storage stack named Horae by two orders of magnitude and 4.9 times on average in terms of throughput of ordered write requests, respectively. RioFS increases the throughput of RocksDB by 1.9 times and 1.5 times on average, against Ext4 and HoraeFS, respectively.
title: Museen und Sammlungen in Württemberg und Hohenzollern. Herausgegeben vom Württembergischen Museumsverband. Silberburg-Verlag, Werner Jäckh, Stuttgart 1960
Creators: name: Hoffmann, Herbert
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 3, Nr. 4 (1960): Nachrichtenblatt der Denkmalpflege in Baden-Württemberg – Organ der Staatlichen Ämter für Denkmalpflege, Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Dynamical Stability in presence of non-minimal derivative dependent coupling of $k$-essence field with a relativistic fluid
Creators: name: Bhattacharya, Kaushik
name: Chatterjee, Anirban
name: Hussain, Saddam
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we investigate a non-minimal, space-time derivative dependent, coupling between the $k$-essence field and a relativistic fluid using a variational approach. The derivative coupling term couples the space-time derivative of the $k$-essence field with the fluid 4-velocity via an inner product. The inner product has a coefficient whose form specifies the various models of interaction. By introducing a coupling term at the Lagrangian level and using the variational technique we obtain the $k$-essence field equation and the Friedmann equations in the background of a spatially flat Friedmann-Lemaitre-Robertson-Walker (FLRW) metric. Explicitly using the dynamical analysis approach we analyze the dynamics of this coupled scenario in the context of two kinds of interaction models. The models are distinguished by the form of the coefficient multiplying the derivative coupling term. In the simplest approach we work with an inverse square law potential of the $k$-essence field. Both of the models are not only capable of producing a stable accelerating solution, they can also explain different phases of the evolutionary universe.
description: 25 pages, 7 tables, 9 figures, Accepted for the publication in EPJC