cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Sample Complexity of Search over Multiple Populations
Creators: name: Malloy, Matthew L.
name: Tang, Gongguo
name: Nowak, Robert D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: This paper studies the sample complexity of searching over multiple populations. We consider a large number of populations, each corresponding to either distribution P0 or P1. The goal of the search problem studied here is to find one population corresponding to distribution P1 with as few samples as possible. The main contribution is to quantify the number of samples needed to correctly find one such population. We consider two general approaches: non-adaptive sampling methods, which sample each population a predetermined number of times until a population following P1 is found, and adaptive sampling methods, which employ sequential sampling schemes for each population. We first derive a lower bound on the number of samples required by any sampling scheme. We then consider an adaptive procedure consisting of a series of sequential probability ratio tests, and show it comes within a constant factor of the lower bound. We give explicit expressions for this constant when samples of the populations follow Gaussian and Bernoulli distributions. An alternative adaptive scheme is discussed which does not require full knowledge of P1, and comes within a constant factor of the optimal scheme. For comparison, a lower bound on the sampling requirements of any non-adaptive scheme is presented.
description: To appear, IEEE Transactions on Information Theory
Confidence and Backaction in the Quantum Filter Equation
Creators: name: Cui, Wei
name: Lambert, Neill
name: Ota, Yukihiro
name: Lü, Xin-You
name: Xiang, Z. -L.
name: You, J. Q.
name: Nori, Franco
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the confidence and backaction of state reconstruction based on a continuous weak measurement and the quantum filter equation. As a physical example we use the traditional model of a double quantum dot being continuously monitored by a quantum point contact. We examine the confidence of the estimate of a state constructed from the measurement record, and the effect of backaction of that measurement on that state. Finally, in the case of general measurements we show that using the relative entropy as a measure of confidence allows us to define the lower bound on the confidence as a type of quantum discord.
description: 9 pages, 6 figures
Non Abelian orbifold compactifications of the heterotic string
Creators: name: Konopka, Sebastian J. H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I consider the construction of heterotic orbifold models based on a toroidal orbifold with non Abelian point group. I construct an explicit model based on the point group $S_3$ and calculate the spectrum and remnant symmetries. This model provides a simple example of rank reduction of the Yang--Mills gauge group directly in the string theory rather than in the effective field theory.
description: 40 pages, based on diploma thesis; accepted for publication in JHEP
Analysis of spatial and temporal variations in bacterial community dynamics within stream biofilms
Creators: name: Gautam, Anju
name: Lear, Gavin
name: Lewis, Gillian D.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified

description: Stream biofilms play an important ecological role in the supply of energy and organic matter to aquatic food webs. Bacterial community composition in stream biofilms is shaped by biotic interactions as well as physicochemical conditions which vary across space and time. However, knowledge of the relative importance of spatial versus temporal factors for microbial community composition is lacking. Here, we applied 16S rRNA gene sequencing to characterise the biofilm bacterial community composition of 732 stream biofilms. These biofilm samples were collected within six streams located a maximum of 118 km apart and draining different catchment types (forest, urban and rural land uses). Samples were collected at monthly intervals for 30 months over 2013–2015. Bacterial community composition was explained better by monthly changes (PERMANOVA; p p = 0.44). Bacterial community composition over months and years followed a discernible cyclical seasonal pattern, as quantified using periodic regression analysis. Temperature, TN, light, and soil moisture deficit were identified as factors most significantly correlated with seasonal variation in bacterial community composition. Overall, these findings suggest that temporal changes are more important than spatial changes across the scales investigated in this study.
Characterisation of constructed ponds and factors influencing their macroinvertebrate communities on the lower Waikato River floodplain, New Zealand
Creators: name: Garrett-Walker, Jeremy
name: Collier, Kevin J.
Publisher: name: Taylor & Francis
Year: 2020
Subjects: subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Ponds are increasingly being constructed to enhance amenity values in human-dominated lowland landscapes, but little is known of design features that influence macroinvertebrates which can provide important food resources for fish and waterbirds. We quantified pond characteristics, sampled benthic and water-column macroinvertebrates in winter, and related abundance, biomass and community composition to characteristics of 34 ponds on the lower Waikato River floodplain, northern New Zealand. Compositionally different macroinvertebrate communities occupied water-column and benthic habitats. Landscape setting had a significant effect on benthic composition in terms of biomass, while the independent effects of frequency of pond drying or flooding, respectively, influenced benthic (abundance, biomass) or water-column (abundance) communities. Distance-based linear models highlighted physicochemical conditions, water depth regimes and riparian vegetation composition as key variables accounting for dissimilarity in total macroinvertebrate biomass between ponds. Our results indicate that managing hydrological stability of ponds in terms of permanence and flooding influences the composition and biomass of invertebrate communities. Within this hydrological template, design of appropriate depth regimes and riparian conditions can enhance accrual of macroinvertebrate biomass, thereby increasing food resources for fish and waterbirds.
Excitation of single multipolar modes with engineered cylindrically symmetric fields
Creators: name: Zambrana-Puyalto, Xavier
name: Vidal, Xavier
name: Molina-Terriza, Gabriel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a new method to address multipolar resonances and to control the scattered field of a spherical scatterer. This method is based on the engineering of the multipolar content of the incident beam. We propose experimentally feasible techniques to generate light beams which contain only a few multipolar modes. The techniques uses incident beams with a well defined component of the angular momentum and appropriate focusing with aplanatic lenses. The control of the multipolar content of light beams allow for the excitation of single Mie resonances and unprecedented control of the scattered field from spherical particles.
description: 14 pages, 4 figures, http://dx.doi.org/10.1364/OE.20.024536
Wigner function for the orientation state
Creators: name: Fischer, Timo
name: Gneiting, Clemens
name: Hornberger, Klaus
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a quantum phase space representation for the orientation state of extended quantum objects, using the Euler angles and their conjugate momenta as phase space coordinates. It exhibits the same properties as the standard Wigner function and thus provides an intuitive framework for discussing quantum effects and semiclassical approximations in the rotational motion. Examples illustrating the viability of this quasi-probability distribution include the phase space description of a molecular alignment effect.
description: 11 pages, 3 figures, v3: corresponds to published version
Titelei
Creators: name: Redaktion, Die
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: -
description: Funde und Ausgrabungen im Bezirk Trier, 1970: Funde und Ausgrabungen im Bezirk Trier : Mitteilungen des Rheinischen Landesmuseums Trier
Aktuelles aus dem Rheinischen Landesmuseum Trier : römische Geschichte und römisches Leben zum Anfassen ; das Kinderferienprogramm 1996
Creators: name: Klementa, Sylvia
name: Stöhr, Simone
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 28 (1996): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
On c-theorems in arbitrary dimensions
Creators: name: Bhattacharyya, Arpan
name: Hung, Ling-Yan
name: Sen, Kallol
name: Sinha, Aninda
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The dilaton action in 3+1 dimensions plays a crucial role in the proof of the a-theorem. This action arises using Wess-Zumino consistency conditions and crucially relies on the existence of the trace anomaly. Since there are no anomalies in odd dimensions, it is interesting to ask how such an action could arise otherwise. Motivated by this we use the AdS/CFT correspondence to examine both even and odd dimensional CFTs. We find that in even dimensions, by promoting the cut-off to a field, one can get an action for this field which coincides with the WZ action in flat space. In three dimensions, we observe that by finding an exact Hamilton-Jacobi counterterm, one can find a non-polynomial action which is invariant under global Weyl rescalings. We comment on how this finding is tied up with the F-theorem conjectures.
description: 25 pages, v3: reference added, Cotton tensor dependence of counterterm at eight-derivative order shown, v4: published version
Exceptional collections of line bundles on the Beauville surface
Creators: name: Galkin, Sergey
name: Shinder, Evgeny
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics

description: We construct quasi-phantom admissible subcategories in the derived category of coherent sheaves on the Beauville surface $S$. These quasi-phantoms subcategories appear as right orthogonals to subcategories generated by exceptional collections of maximal possible length 4 on $S$. We prove that there are exactly 6 exceptional collections consisting of line bundles (up to a twist) and these collections are spires of two helices.
description: Revised version, accepted to Advances in Mathematics
Fundamental issues in nonlinear wideband-vibration energy harvesting
Creators: name: Halvorsen, Einar
Publisher: name: arXiv
Year: 2012
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Mechanically nonlinear energy harvesters driven by broadband vibrations modeled as white noise are investigated. We derive an upper bound on output power versus load resistance and show that, subject to mild restrictions that we make precise, the upper-bound performance can be obtained by a linear harvester with appropriate stiffness. Despite this, nonlinear harvesters can have implementation-related advantages. Based on the Kramers equation, we numerically obtain the output power at weak coupling for a selection of phenomenological elastic potentials and discuss their merits.
description: 7 pages, 6 figures, published in Phys. Rev. E
Searching for Stringy Topologies in the Cosmic Microwave Background
Creators: name: Ben-David, Assaf
name: Rathaus, Ben
name: Itzhaki, Nissan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider a universe with a non-classical stringy topology that has fixed points. We concentrate on the simplest example, an orbifold point, and study its observable imprints on the cosmic microwave background (CMB). We show that an orbifold preserves the Gaussian nature of the temperature fluctuations, yet modifies the angular correlation function. A direct signature of an orbifold is a single circle in the CMB that is invariant under rotation by 180 degrees. Searching the 7-year ILC map of WMAP, we find one candidate circle with high statistical significance. However, a closer look reveals that the temperature profile does not fit an orbifold. We place a lower bound on the distance to an orbifold point at ~85% of the distance to the surface of last scattering.
description: Published in JCAP. 10 pages, 8 figures
Ein reicher Schatz an (Lauf-)Bildern
Creators: name: Heftberger, Adelheid
Publisher: name: AKMB-news: Informationen zu Kunst, Museum und Bibliothek
Year: 2019

description: AKMB-news: Informationen zu Kunst, Museum und Bibliothek, Bd. 24 Nr. 1 (2018): AKMB-news
Syndetic submeasures and partitions of $G$-spaces and groups
Creators: name: Banakh, Taras
name: Protasov, Igor
name: Slobodianiuk, Sergiy
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 43A07, 05B40, 20F24, 28C10, 54H11

description: We prove that for every number k each countable infinite group $G$ admits a partition $G=A\cup B$ into two sets which are $k$-meager in the sense that for every $k$-element subset $K\subset G$ the sets $KA$ and $KB$ are not thick. The proof is based on the fact that $G$ possesses a syndetic submeasure, i.e., a left-invariant submeasure $μ:\mathcal P(G)\to[0,1]$ such that for each $ε> 1/|G|$ and subset $A\subset G$ with $μ(A)<1$ there is a set $B\subset G\setminus A$ such that $μ(B)
description: 8 pages
Post-shock-revival evolutions in the neutrino-heating mechanism of core-collapse supernovae
Creators: name: Yamamoto, Yu
name: Fujimoto, Shin-ichiro
name: Nagakura, Hiroki
name: Yamada, Shoichi
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We perform some experimental simulations in spherical symmetry and axisymmetry to understand the post-shock-revival evolution of core-collapse supernovae. Assuming that the stalled shock wave is relaunched by neutrino heating and employing the so-called light bulb approximation, we induce shock revival by raising the neutrino luminosity by hand up to the critical value, which is also de- termined by dynamical simulations. A 15M_{sun} progenitor model is employed. We incorporate nuclear network calculations with a consistent equation of state in the simulations to account for the energy release by nuclear reactions and their feedback to hydrodynamics. Varying the shock-relaunch time rather arbitrarily, we investigate the ensuing long-term evolutions systematically, paying particular attention to the explosion energy and nucleosynthetic yields as a function of this relaunch time, or equivalently the accretion rate at shock revival. We study in detail how the diagnostic explosion energy approaches the asymptotic value and which physical processes contribute to the explosion energy in what proportions as well as their dependence on the relaunch time and the dimension of dynamics. We find that the contribution of nuclear reactions to the explosion energy is comparable to or greater than that of neutrino heating. In particular, recombinations are dominant over burnings in the contributions of nuclear reactions. Interestingly 1D models studied in this paper cannot produce the appropriate explosion energy and nickel mass simultaneously, overproducing nickels, whereas this problem is resolved in 2D models if the shock is relaunched at 300-400ms after bounce.
description: Accepted for publication in ApJ. A major bug fixed in the 2D simulations. The main conclusion unchanged qualitatively
Titel
Creators: name: Redaktion, Die
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: -
description: Funde und Ausgrabungen im Bezirk Trier, 1972: Funde und Ausgrabungen im Bezirk Trier : Mitteilungen des Rheinischen Landesmuseums Trier
Urban characteristics attributable to density-driven tie formation
Creators: name: Pan, Wei
name: Ghoshal, Gourab
name: Krumme, Coco
name: Cebrian, Manuel
name: Pentland, Alex
Publisher: name: arXiv
Year: 2012
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Motivated by empirical evidence on the interplay between geography, population density and societal interaction, we propose a generative process for the evolution of social structure in cities. Our analytical and simulation results predict both super-linear scaling of social tie density and information flow as a function of the population. We demonstrate that our model provides a robust and accurate fit for the dependency of city characteristics with city size, ranging from individual-level dyadic interactions (number of acquaintances, volume of communication) to population-level variables (contagious disease rates, patenting activity, economic productivity and crime) without the need to appeal to modularity, specialization, or hierarchy.
description: Early version of this paper was presented in NetSci 2012 as a contributed talk in June 2012. An improved version of this paper is published in Nature Communications in June 2013. It has 14 pages and 5 figures
Keltische Frauen
Creators: name: Nortmann, Hans
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 32 (2000): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Bulk Superconductivity in Bismuth-oxy-sulfide Bi4O4S3
Creators: name: Singh, Shiva Kumar
name: Kumar, Anuj
name: Gahtori, Bhasker
name: Kirtan, Shruti
name: Sharma, G.
name: Patnaik, S.
name: Awana, V. P. S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Very recent report [1] on observation of superconductivity in Bi4O4S3 could potentially reignite the search for superconductivity in a broad range of layered sulphides. We report here synthesis of Bi4O4S3 at 5000C by vacuum encapsulation technique and basic characterizations. Detailed structural, magnetization, and electrical transport results are reported. Bi4O4S3 is contaminated by small amounts of Bi2S3 and Bi impurities. The majority phase is tetragonal I4/mmm space group with lattice parameters a = 3.9697(2)Å, c = 41.3520(1)Å. Both AC and DC magnetization measurements confirmed that Bi4O4S3 is a bulk superconductor with superconducting transition temperature (Tc) of 4.4K. Isothermal magnetization (MH) measurements indicated closed loops with clear signatures of flux pinning and irreversible behavior. The lower critical field (Hc1) at 2K, of the new superconductor is found to be ~39 Oe. The magneto-transport R(T, H) measurements showed a resistive broadening and decrease in Tc (R=0) to lower temperatures with increasing magnetic field. The extrapolated upper critical field Hc2(0) is ~ 310kOe with a corresponding Ginzburg-Landau coherence length of ~100Å . In the normal state the ρ ~ T2 is not indicated. Our magnetization and electrical transport measurements substantiate the appearance of bulk superconductivity in as synthesized Bi4O4S3. On the other hand same temperature heat treated Bi is not superconducting, thus excluding possibility of impurity driven superconductivity in the newly discovered Bi4O4S3 superconductor.
description: 12 pages Text + Figs
Heat conduction induced by non-Gaussian athermal fluctuations
Creators: name: Kanazawa, Kiyoshi
name: Sagawa, Takahiro
name: Hayakawa, Hisao
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the properties of heat conduction induced by non-Gaussian noises from athermal environments. We find that new terms should be added to the conventional Fourier law and the fluctuation theorem for the heat current, where its average and fluctuation are determined not only by the noise intensities but also by the non-Gaussian nature of the noises. Our results explicitly show the absence of the zeroth law of thermodynamics in athermal systems.
description: 15 pages, 4 figures, PRE in press
Die römische Grabkammer von Duppach-Weiermühle, Kreis Daun : Vorbericht der Grabungen 2004
Creators: name: Henrich, Peter
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 36 (2004): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
A Symmetric Integrator for non-integrable Hamiltonian Relativistic Systems
Creators: name: Seyrich, Jonathan
name: Lukes-Gerakopoulos, Georgios
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: By combining a standard symmetric, symplectic integrator with a new step size controller, we provide an integration scheme that is symmetric, reversible and conserves the values of the constants of motion. This new scheme is appropriate for long term numerical integrations of geodesic orbits in spacetime backgrounds, whose corresponding Hamiltonian system is non-integrable, and, in general, for any non-integrable Hamiltonian system whose kinetic part depends on the position variables. We show by numerical examples that the new integrator is faster and more accurate i) than the standard symplectic integration schemes with or without standard adaptive step size controllers and ii) than an adaptive step Runge-Kutta scheme.
description: 12 pages, 8 figures, 3 tables
How do curved spheres intersect in 3-space?
Creators: name: Avvakumov, Sergey
Publisher: name: arXiv
Year: 2012
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: The following problem was proposed in 2010 by S. Lando. Let $M$ and $N$ be two unions of the same number of disjoint circles in a sphere. Do there always exist two spheres in 3-space such that their intersection is transversal and is a union of disjoint circles that is situated as $M$ in one sphere and as $N$ in the other? Union $M'$ of disjoint circles is {\it situated} in one sphere as union $M$ of disjoint circles in the other sphere if there is a homeomorphism between these two spheres which maps $M'$ to $M$. We prove (by giving an explicit example) that the answer to this problem is "no". We also prove a necessary and sufficient condition on $M$ and $N$ for existing of such intersecting spheres. This result can be restated in terms of graphs. Such restatement allows for a trivial brute-force algorithm checking the condition for any given $M$ and $N$. It is an open question if a faster algorithm exist.
description: 9 pages, 9 figures
Der Trierer "Römersprudel" : Von der Quellfassung der Bronzezeit zur römischen Brunnenstube
Creators: name: Neyses-Eiden, Mechthild
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 36 (2004): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Hans Eichler (1906-1982) und die Trierer Kunst des Mittelalters : Mit Nachlassverzeichnis und Bibliografie
Creators: name: Merten, Jürgen
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 39 (2007): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Production of secondaries in soft p+pb collisions at LHC
Creators: name: Merino, C.
name: Pajares, C.
name: Shabelski, Yu. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We calculate the inclusive spectra of secondaries produced in soft (minimum bias) p+Pb collisions in the framework of Quark-Gluon String Model at LHC energy, and by taking into account the inelastic screening corrections (percolation effects). The role of these effects is expected to be very large at very high energies, and they should decrease the spectra about 3 times in the midrapidity region and increase them about 2 times in the fragmentation region at the energy of LHC.
description: 18 pages and 10 figures. arXiv admin note: text overlap with arXiv:0802.2195
Trier, Grabung Fleischstraße/Metzelstraße : Entwicklung eines römischen Stadtviertels
Creators: name: Breitner, Georg
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 39 (2007): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Minimax properties of Fréchet means of discretely sampled curves
Creators: name: Bigot, Jérémie
name: Gendre, Xavier
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We study the problem of estimating a mean pattern from a set of similar curves in the setting where the variability in the data is due to random geometric deformations and additive noise. We propose an estimator based on the notion of Frechet mean that is a generalization of the standard notion of averaging to non-Euclidean spaces. We derive a minimax rate for this estimation problem, and we show that our estimator achieves this optimal rate under the asymptotics where both the number of curves and the number of sampling points go to infinity.
Downconversion quantum interface for a single quantum dot spin and 1550-nm single-photon channel
Creators: name: Pelc, Jason S.
name: Yu, Leo
name: De Greve, Kristiaan
name: McMahon, Peter L.
name: Natarajan, Chandra M.
name: Esfandyarpour, Vahid
name: Maier, Sebastian
name: Schneider, Christian
name: Kamp, Martin
name: Höfling, Sven
name: Hadfield, Robert H.
name: Forchel, Alfred
name: Yamamoto, Yoshihisa
name: Fejer, M. M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Long-distance quantum communication networks require appropriate interfaces between matter qubit-based nodes and low-loss photonic quantum channels. We implement a downconversion quantum interface, where the single photons emitted from a semiconductor quantum dot at 910 nm are downconverted to 1560 nm using a fiber-coupled periodically poled lithium niobate waveguide and a 2.2-$μ$m pulsed pump laser. The single-photon character of the quantum dot emission is preserved during the downconversion process: we measure a cross-correlation $g^{(2)}(τ= 0) = 0.17$ using resonant excitation of the quantum dot. We show that the downconversion interface is fully compatible with coherent optical control of the quantum dot electron spin through the observation of Rabi oscillations in the downconverted photon counts. These results represent a critical step towards a long-distance hybrid quantum network in which subsystems operating at different wavelengths are connected through quantum frequency conversion devices and 1.5-$μ$m quantum channels.
Verschollen geglaubt und wieder aufgetaucht : Die Gründungsinschrift der Trierer Kapuzinerkirche von 1617
Creators: name: Hupe, Joachim
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 41 (2009): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Quantum Metrological Limits via a Variational Approach
Creators: name: Escher, B. M.
name: Davidovich, L.
name: Zagury, N.
name: Filho, R. L. de Matos
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The minimum achievable statistical uncertainty in the estimation of physical parameters is determined by the quantum Fisher information. Its computation for noisy systems is still a challenging problem. Using a variational approach, we present an equation for obtaining the quantum Fisher information, which has an explicit dependence on the mathematical description of the noise. This method is applied to obtain a useful analytical bound to the quantum precision in the estimation of phase-shifts under phase diffusion, which shows that the estimation uncertainty cannot be smaller than a noise-dependent constant.
description: Published Version: 5 pages (including references), 1 figure, typos corrected, and text little bit improved
On the Harder-Narasimhan filtration for finite dimensional representations of quivers
Creators: name: Zamora, Alfonso
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14D20, 14L24, 16G20

description: We prove that the Harder-Narasimhan filtration for an unstable finite dimensional representation of a finite quiver coincides with the filtration associated to the 1-parameter subgroup of Kempf, which gives maximal unstability in the sense of Geometric Invariant Theory for the corresponding point in the parameter space where these objects are parametrized in the construction of the moduli space.
description: v2 13 pages, minor corrections suggested by the referee and references added. To appear in Geom. Dedicata
Level set estimation from projection measurements: Performance guarantees and fast computation
Creators: name: Krishnamurthy, Kalyani
name: Bajwa, Waheed U.
name: Willett, Rebecca
Publisher: name: arXiv
Year: 2012
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences
subject: 62, 68

description: Estimation of the level set of a function (i.e., regions where the function exceeds some value) is an important problem with applications in digital elevation mapping, medical imaging, astronomy, etc. In many applications, the function of interest is not observed directly. Rather, it is acquired through (linear) projection measurements, such as tomographic projections, interferometric measurements, coded-aperture measurements, and random projections associated with compressed sensing. This paper describes a new methodology for rapid and accurate estimation of the level set from such projection measurements. The key defining characteristic of the proposed method, called the projective level set estimator, is its ability to estimate the level set from projection measurements without an intermediate reconstruction step. This leads to significantly faster computation relative to heuristic "plug-in" methods that first estimate the function, typically with an iterative algorithm, and then threshold the result. The paper also includes a rigorous theoretical analysis of the proposed method, which utilizes the recent results from the non-asymptotic theory of random matrices results from the literature on concentration of measure and characterizes the estimator's performance in terms of geometry of the measurement operator and 1-norm of the discretized function.
description: 23 pages, 20 figures
Temporal changes in labile soil phosphorus pools in grassland receiving P recycled from dairy processing sludge
Creators: name: Khomenko, Olha
name: Fenton, Owen
name: LEAHY, JAMES J
name: Daly, Karen
Publisher: name: University of Limerick
Year: 2023
Subjects: classificationCode: 34
subject: Chemical sciences
subject: FOS: Chemical sciences

description: Replacing chemical fertilisers with recycled products will require new advice for phosphorus (P) use.. Emerging P fertilisers derived from dairy processing sludge (DPS) include products such as struvite and hydrochar. A field study monitored temporal changes in available, exchangeable, and Mehlich3 P pools in a P deficient grassland amended with DPS-derived hydrochar and struvite. Herbage P content and yields were compared with data from plots amended with a mineral P fertiliser. Regardless of fertiliser used, there was no statistical difference in dry matter yield. However, herbage P content varied depending on the fertiliser type. The optimal P content in herbage for cattle feed (0.3–0.4 %) was reached using struvite and mineral fertiliser. Application of struvites increased available, exchangeable, and Mehlich3 P, raising the available P levels to the agronomic optimal value for crop production (>5 mg L-1) within one month. In hydrochar amended plots, the optimal level of P was reached 4 months after fertilisation, at the end of the growing season. During the low growth or dormancy period, soil P levels decreased and remained low regardless of the treatment. In the struvite amended plots, available and exchangeable P pools recovered at the beginning of the second season. This effect was not observed in mineral fertiliser and hydrochar amended plots. A single application of struvite can replace mineral fertilisers supplying crops with P for more than one season. This needs to be reflected in the advice for growers to avoid excessive P application and legacy P deposition.
Strain-induced modulation of magnetic interactions in graphene
Creators: name: Power, S. R.
name: Gorman, P. D.
name: Duffy, J. M.
name: Ferreira, M. S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The ease with which the physical properties of graphene can be tuned suggests a wide range of possible applications. Recently, strain engineering of these properties has been of particular interest. Possible spintronic applications of magnetically doped graphene systems have motivated recent theoretical investigations of the so-called Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between localized moments in graphene. In this work a combination of analytic and numerical techniques are used to examine the effects of uniaxial strain on such an interaction. A range of interesting features are uncovered depending on the separation and strain directions. Amplification, suppression, and oscillatory behavior are reported as a function of the strain and mathematically transparent expressions predicting these features are derived. Since a wide range of effects, including overall moment formation and magnetotransport response, are underpinned by such interactions we predict that the ability to manipulate the coupling by applying strain may lead to interesting spintronic applications.
description: 6 pages, 3 figures
Titel
Creators: name: Redaktion, Die
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: -
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 44 (2012): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
The classical mechanics of non-conservative systems
Creators: name: Galley, Chad R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Optimization and Control (math.OC)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Hamilton's principle of stationary action lies at the foundation of theoretical physics and is applied in many other disciplines from pure mathematics to economics. Despite its utility, Hamilton's principle has a subtle pitfall that often goes unnoticed in physics: it is formulated as a boundary value problem in time but is used to derive equations of motion that are solved with initial data. This subtlety can have undesirable effects. I present a formulation of Hamilton's principle that is compatible with initial value problems. Remarkably, this leads to a natural formulation for the Lagrangian and Hamiltonian dynamics of generic non-conservative systems, thereby filling a long-standing gap in classical mechanics. Thus dissipative effects, for example, can be studied with new tools that may have application in a variety of disciplines. The new formalism is demonstrated by two examples of non-conservative systems: an object moving in a fluid with viscous drag forces and a harmonic oscillator coupled to a dissipative environment.
description: 5 pages, 1 figure. Updated to incorporate referees' comments. Matches published version
Ralf Keller, Die Siedlung der Eisenzeit und Römischen Kaiserzeit im “Reißwag” bei Lauda-Königshofen im Taubertal
Creators: name: Łuczkiewicz, Piotr
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Ralf Keller, Die Siedlung der Eisenzeit und Römischen Kaiserzeit im “Reißwag” bei Lauda-Königshofen im Taubertal. Materialhefte zur Archäologie in Baden-Württemberg volume 100. Konrad Theiss, Darmstadt 2015. ISBN 978-3-8062-2915-8. 528 pages, 107 illustrations, 50 tables, 95 plates
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 96 2018(2019)
title: Deforestation surge ends a decade of progress for Indonesia’s pulp sector
Creators: name: University of California Santa Barbara
name: Woods and Wayside International
name: TheTreeMap
name: Stockholm Environment Institute
name: Global Canopy
Publisher: name: Trase
Year: 2023
Subjects: classificationCode: 1.5
subject: FOS: Earth and related environmental sciences
classificationCode: 4.1
subject: FOS: Agriculture, forestry and fisheries
classificationCode: 5.2
subject: FOS: Economics and business

description: The construction of new, large-scale pulp mills in Indonesia to meet growing demand from China is driving an increase in deforestation and carbon emissions.
Neutrino oscillations above black hole accretion disks: disks with electron-flavor emission
Creators: name: Malkus, A.
name: Kneller, J. P.
name: McLaughlin, G. C.
name: Surman, R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Black hole accretion disks can form through the collapse of rotating massive stars. These disks produce large numbers of neutrinos and antineutrinos of electron flavor that can influence energetics and nucleosynthesis. Neutrinos are produced in sufficient numbers that, after they are emitted, they can undergo flavor transformation facilitated by the neutrino self interaction. We show that some of the neutrino flavor transformation phenomenology for accretion disks is similar to that of the supernova case, but also, we find the disk geometry lends itself to different transformation behaviors. These transformations strongly influence the nucleosynthetic outcome of disk winds.
Thomas Meier / Michael R. Ott / Rebecca Sauer (eds), Materiale Textkulturen
Creators: name: Matić, Uroš
Publisher: name: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts
Year: 2019

description: Rezension zu: Thomas Meier / Michael R. Ott / Rebecca Sauer (eds), Materiale Textkulturen. Konzepte– Materialien – Praktiken. Materiale Textkulturen 1. Walter de Gruyter GmbH, Berlin / München/ Boston 2015. € 129.95. ISBN 978-3-11-037128-4. 746 pages with 185 illustrations
description: Germania : Anzeiger der Römisch-Germanischen Kommission des Deutschen Archäologischen Instituts, Bd. 96 2018(2019)
Pull-back Morphisms for Reflexive Differential Forms
Creators: name: Kebekus, Stefan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J17, 14B05

description: Let f : X -> Y be a morphism between normal complex varieties, and assume that Y is Kawamata log terminal. Given any differential form, defined on the smooth locus of Y, we construct a "pull-back form" on X. The pull-back map obtained by this construction is O_Y-linear, uniquely determined by natural universal properties and exists even in cases where the image of f is entirely contained in the singular locus of the target variety Y. One relevant setting covered by the construction is that where f is the inclusion (or normalisation) of the singular locus of Y. As an immediate corollary, we show that differential forms defined on the smooth locus of Y induce forms on every stratum of the singularity stratification. The same result also holds for many Whitney stratifications.
description: Final version, to appear in Advances in Mathematics
Quantum McKay correspondence and global dimensions for fusion and module-categories associated with Lie groups
Creators: name: Coquereaux, Robert
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Global dimensions for fusion categories defined by a pair (G,k), where G is a Lie group and k a positive integer, are expressed in terms of Lie quantum superfactorial functions. The global dimension is defined as the square sum of quantum dimensions of simple objects, for the category of integrable modules over an affine Lie algebra at some level. The same quantities can also be defined from the theory of quantum groups at roots of unity or from conformal field theory WZW models. Similar results are also presented for those associated module-categories that can be obtained via conformal embeddings (they are "quantum subgroups" of a particular kind). As a side result, we express the classical (or quantum) Weyl denominator of simple Lie groups in terms of products of classical (or quantum) factorials calculated for the exponents of the group. Some calculations use the correspondence existing between periodic quivers for simply-laced Lie groups and fusion rules for module-categories (alias nimreps) of type SU(2).
description: 23 pages. Improvements suggested by a referee: those parts that had much overlap with previous work of the author have been removed, the section discussing the relation between SU2 fusion numbers and roots and weights of Lie groups was enlarged, new reference [9], new appendix
Nanophotonic control of the Forster resonance energy transfer efficiency
Creators: name: Blum, Christian
name: Zijlstra, Niels
name: Lagendijk, Ad
name: Wubs, Martijn
name: Mosk, Allard P.
name: Subramaniam, Vinod
name: Vos, Willem L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We have studied the influence of the local density of optical states (LDOS) on the rate and efficiency of Forster resonance energy transfer (FRET) from a donor to an acceptor. The donors and acceptors are dye molecules that are separated by a short strand of double-stranded DNA. The LDOS is controlled by carefully positioning the FRET pairs near a mirror. We find that the energy transfer efficiency changes with LDOS, and that, in agreement with theory, the energy transfer rate is independent of the LDOS, which allows one to quantitatively control FRET systems in a new way. Our results imply a change in the characteristic Forster distance, in contrast to common lore that this distance is fixed for a given FRET pair.
description: 5 pages, 3 figures, typos corrected, minor textual changes
Avaliação da eficácia de mensagens de erro melhoradas geradas por Large Language Model em um curso introdutório de programação em Python
Creators: name: Araujo, Luis
name: von Flach, Christina
name: Bittencourt, Roberto
Publisher: name: Zenodo
Year: 2023
Subjects: Mensagem de Erro melhorada
Ensino de programação
Large Language Model

description: Linguagens de Programação, em sua maioria, são idealizadas para o mercado de desenvolvimento de software. Em consequência, o feedback na forma de mensagens de erro de compiladores e interpretadores são focados em programadores experientes, sendo muitas vezes enigmáticos para estudantes novatos. Diante dos desafios da aprendizagem de programação, diversos pesquisadores se debruçam sobre este problema criando e utilizando ferramentas e linguagens adequadas ou adaptando feedbacks. Embora a linguagem Python seja adequada ao ensino introdutório de programação, ela possui um conjunto limitado de mensagens de erro que levam o estudante a possíveis confusões pela falta de informações relevantes à solução do problema. Neste sentido, a criação de feedback na forma de mensagens de erro melhoradas, que auxiliem os estudantes no ambiente de aprendizagem, é uma solução interessante. Um estudo preliminar realizado em um curso de programação introdutória com Python em que foi utilizado um ambiente próprio (PEEF) com emissão de mensagens melhoradas pré-cadastradas demonstrou que, embora a adição de feedback seja algo positivo, não é suficiente para que os estudantes solucionem os problemas encontrados. Deste modo, este trabalho visa apresentar um estudo realizado com especialistas para avaliar a adequação de mensagens melhoradas geradas por Large Language Model com dados de um curso de programação em Python.
Finite-size critical fluctuations in microscopic models of mode-coupling theory
Creators: name: Franz, Silvio
name: Sellitto, Mauro
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Facilitated spin models on random graphs provide an ideal microscopic realization of the mode-coupling theory of supercooled liquids: they undergo a purely dynamic glass transition with no thermodynamic singularity. In this paper we study the fluctuations of dynamical heterogeneity and their finite-size scaling properties in the beta relaxation regime of such microscopic spin models. We compare the critical fluctuations behavior for two distinct measures of correlations with the results of a recently proposed field theoretical description based on quasi-equilibrium ideas. We find that the theoretical predictions perfectly fit the numerical simulation data once the relevant order parameter is identified with the persistence function of the spins.