cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A universal Hamiltonian for the motion and the merging of Dirac cones in a two-dimensional crystal
Creators: name: Montambaux, G.
name: Piechon, F.
name: Fuchs, J. -N.
name: Goerbig, M. O.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a simple Hamiltonian to describe the motion and the merging of Dirac points in the electronic spectrum of two-dimensional electrons. This merging is a topological transition which separates a semi-metallic phase with two Dirac cones from an insulating phase with a gap. We calculate the density of states and the specific heat. The spectrum in a magnetic field B is related to the resolution of a Schrodinger equation in a double well potential. They obey the general scaling law e_n \propto B^{2/3} f_n(Delta /B^{2/3}. They evolve continuously from a sqrt{n B} to a linear (n+1/2)B dependence, with a [(n+1/2)B]^{2/3} dependence at the transition. The spectrum in the vicinity of the topological transition is very well described by a semiclassical quantization rule. This model describes continuously the coupling between valleys associated with the two Dirac points, when approaching the transition. It is applied to the tight-binding model of graphene and its generalization when one hopping parameter is varied. It remarkably reproduces the low field part of the Rammal-Hofstadter spectrum for the honeycomb lattice.
description: 18 pages, 15 figures
EU Agroforestry Policy: an overview
Creators: name: LAWSON, Gerry
Publisher: name: Zenodo
Year: 2021

description: This briefing summarises:  incentives available for for forestry in the current Common Agricultural Policies, discussions on policies relevant to agroforestry in the next CAP (2023-27), a suggested typology for agroforestry systems and practices, policy recommendations made in previous EURAF Policy Briefings.
description: EURAF Policy Briefing 11
Rational homotopy theory and differential graded category
Creators: name: Moriya, Syunji
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We propose a generalization of Sullivan's de Rham homotopy theory to non-simply connected spaces. The formulation is such that the real homotopy type of a manifold should be the closed tensor dg-category of flat bundles on it much the same as the real homotopy type of a simply connected manifold is the de Rham algebra in original Sullivan's theory. We prove the existence of a model category structure on the category of small closed tensor dg-categories and as a most simple case, confirm an equivalence between the homotopy category of spaces whose fundamental groups are finite and whose higher homotopy groups are finite dimensional rational vector spaces and the homotopy category of small closed tensor dg-categories satisfying certain conditions.
description: 28pages, revised version, title changed, to appear in JPAA
Agroforestry & the EU Fit for 55 Package.
Creators: name: LAWSON, Gerry
Publisher: name: Zenodo
Year: 2021

description: The fit for 55 package contains several draft regulations relevant to agroforestry, principally the Forest Strategy 2030,  the amended LULUCF Regulation. EURAF has five recommendations: a) Member States should use the 10 component agroforestry typology in their CAP strategic plans and LULUCF inventories, b) Member States need to improve the consistency of their reporting of Trees outside Forests in submissions to the FAO, c) monitoring and  rules for “tree-landscape-features” need to be clarified by Member States; d) Member States are urged to implement the agroforestry Eco Scheme listed by the Commission. e) all member states are urged to include agroforestry in Pillar II of their CAP Strategic Plans.
description: EURAF Policy Briefing #12
Development and anti-Candida evaluation of the vaginal delivery system of amphotericin B nanosuspension-loaded thermogel
Creators: name: Ci, Tianyuan
name: Yuan, Luo
name: Bao, Xiaoyan
name: Hou, Yuting
name: Wu, Hao
name: Sun, Haifeng
name: Cao, Dinglingge
name: Ke, Xue
Publisher: name: Taylor & Francis
Year: 2018
Subjects: Space Science
Medicine
Pharmacology
Biotechnology
Chemical Sciences not elsewhere classified
Developmental Biology
Cancer

description: Vulvovaginal candidiasis (VVC) is a typical kind of vaginal mucosal infection. Herein, we developed a novel vaginal delivery system of amphotericin B (AmB) nanosuspension-loaded thermogel (AmB NPs/thermogel) utilising pharmaceutical technique of high-pressure homogenisation and Poloxamer P407/P188 hydrogel. The stabiliser and hydrogel materials of the formulation were tested to maintain proper sol–gel transition as well as the relative stability of the particle size of AmB nanosuspension in the thermogel. The particle size of AmB nanosuspensions in the hydrogel was ∼247 nm. Transmission electron microscopy images confirmed the round-shape morphology of AmB nanoparticles in AmB NPs/thermogel, while that of irregular morphology of merely AmB nanosuspensions without stabiliser and hydrogel materials. AmB could be sustained release for ∼12 h in vitro. In vivo drug content in the vaginal tissue was also evaluated with 87, 47, 33 and 6.7% drug remaining after 1, 3, 6 and 12 h, respectively. The in vivo anti-Candida test was conducted on candidiasis-infected mice model. In the same drug dose of 2.5 mg/kg, AmB NPs/thermogel showed better anti-Candida efficiency compared with commercial AmB effervescent tablet. This delivery system might show some insights for the vaginal formulation development of other hydrophobic antifungal drugs.
Connected economically metrizable spaces
Creators: name: Banakh, T.
name: Vovk, M.
name: Wójcik, M. R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Topology (math.GN)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 54B30, 54C30, 54D05, 54E35, 54E50, 54F15, 54G15, 54G20

description: A topological space is nonseparably connected if it is connected but all of its connected separable subspaces are singletons. We show that each connected sequential topological space X is the image of a nonseparably connected complete metric space Eco(X) under a monotone quotient map. The metric d of the space Eco(X) is economical in the sense that for each infinite subspace A of X the cardinality of the set {d(a,b):a,b in A} does not exceed the density of A. The construction of the space Eco(X) determines a functor Eco from the category Top of topological spaces and their continuous maps into the category Metr of metric spaces and their non-expanding maps.
description: 20 pages
Agroforestry and the EU Soil Strategy 2030
Creators: name: LAWSON, Gerry
Publisher: name: Zenodo
Year: 2022

description: Agroforestry, as a sustainable land management practice, has been shown to have an important role in improving soil quality and health based on at least four decades of data gathered from the world over. A large body of papers (summarised in Dollinger and Jose 2018 Mayer et al 2022) reaffirms that agroforestry can improve the major measurable soil metrics that define soil health, and show that agroforestry has the ability to (1) enrich soil organic carbon better than monocropping systems, (2) improve soil nutrient availability and soil fertility due to the presence of trees in the system, and (3) enhance soil microbial dynamics, which would positively influence soil health. It is imperative that agroforestry, as part of a multifunctional land-use strategy, should receive increased attention in our policy discussion for the future of soil and soil health.
description: EURAF Policy Briefing #13
Donaldson-Thomas theory and cluster algebras
Creators: name: Nagao, Kentaro
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 14N35, 18E30, 16G20

description: We provide a transformation formula of non-commutative Donaldson-Thomas invariants under a composition of mutations. Consequently, we get a description of a composition of cluster transformations in terms of quiver Grassmannians. As an application, we give an alternative proof of Fomin-Zelevinsky's conjectures on $F$-polynomials and $g$-vectors.
description: 39 pages, 8 figures, mostly rewritten
Digital Workflows at the National Agricultural Library and Implications for Preservation
Creators: name: Daniels, Morgan
Publisher: name: Digital Repository at the University of Maryland
Year: 2018
Subjects: digital preservation
digital workflows
data curation
research data

description: This study was designed to surface needs for an organization-wide digital preservation infrastructure at the National Agricultural Library by examining the processes currently used at NAL in routine work with digital materials. It used an observation-based interview method to learn directly from staff members about their workflows with digital objects, combining the information gathered into models that depict their work. The report is organized to follow each of the four major digital workflows, ending with a discussion of the implications of the study for an overarching digital preservation program at the library.
Adaptive Optics Parameters connection to wind speed at the Teide Observatory
Creators: name: Garcia-Lorenzo, B.
name: Eff-Darwich, A.
name: Fuensalida, J. J.
name: Castro-Almazan, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Current projects for large telescopes demand a proper knowledge of atmospheric turbulence to design efficient adaptive optics systems in order to reach large Strehl ratios. However, the proper characterization of the turbulence above a particular site requires long-term monitoring. Due to the lack of long-term information on turbulence, high-altitude winds (in particular winds at the 200 mbar pressure level) were proposed as a parameter for estimating the total turbulence at a particular site, with the advantage of records of winds going back several decades. We present the first complete study of atmospheric adaptive optics parameters above the Teide Observatory (Canary Islands, Spain) in relation to wind speed. On-site measurements of CN2(h) profiles (more than 20200 turbulence profiles) from G-SCIDAR observations and wind vertical profiles from balloons have been used to calculate the seeing, the isoplanatic angle and the coherence time. The connection of these parameters to wind speeds at ground and 200 mbar pressure level are shown and discussed. Our results confirm the well-known high quality of the Canary Islands astronomical observatories.
description: 25 pages, 12 figures, 6 tables with daily AO parameters (100 nights). Submitted to MNRAS
Agroforestry in the CAP post 1.1.2023
Creators: name: LAWSON, Gerry
Publisher: name: Zenodo
Year: 2022

description: Agroforestry is mentioned in nine sections of the Strategic Plan Regulation.  EURAF welcomes these mentions and especially Article 4 which makes clear that agroforestry is an integral part of agricultural land. It remains to be seen how Member States will interpret the GAEC-8 rules in relation to tree-landscape-features, and the agroforestry options in Ecoschemes (Pillar I).  Agroforestry is also recommended for inclusion in the Pillar II Agri-Environment-Climate Measures and Investment Measures (Pillar II).
description: EURAF Policy Briefing #14
Capacity Regions and Sum-Rate Capacities of Vector Gaussian Interference Channels
Creators: name: Shang, Xiaohu
name: Chen, Biao
name: Kramer, Gerhard
name: Poor, H. Vincent
Publisher: name: arXiv
Year: 2009
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The capacity regions of vector, or multiple-input multiple-output, Gaussian interference channels are established for very strong interference and aligned strong interference. Furthermore, the sum-rate capacities are established for Z interference, noisy interference, and mixed (aligned weak/intermediate and aligned strong) interference. These results generalize known results for scalar Gaussian interference channels.
description: 33 pages, 1 figure, submitted to IEEE trans. on Information theory
ИЧКИ ИШЛАР ОРГАНЛАРИНИНГ ТАЗЙИҚ ВА ЗЎРАВОНЛИКНИНГ ПРОФИЛАКТИКАСИДА ЖАМОАТ ТУЗИЛМАЛАРИ БИЛАН ҲАМКОРЛИКНИ ТАШКИЛ ЭТИШНИНГ ЎЗИГА ХОС ХУСУСИЯТЛАРИ
Creators: name: Ўсаров, Садриддин
Publisher: name: Zenodo
Year: 2024

description: Ушбу мақолада ички ишлар органларининг тазйиқ ва зўравонликнинг профилактикасида жамоат тузилмалари билан ҳамкорликни ташкил этишнинг ташкилий-ҳуқуқий жиҳатлари, бу борада амалга ошириладиган ҳамкорлик масалалари ёритилган.
The viscous overstability, nonlinear wavetrains, and finescale structure in dense planetary rings
Creators: name: Latter, Henrik N.
name: Ogilvie, Gordon I.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: This paper addresses the fine-scale axisymmetric structure exhibited in Saturn's A and B-rings. We aim to explain both the periodic microstructure on 150-220m, revealed by the Cassini UVIS and RSS instruments, and the irregular variations in brightness on 1-10km, reported by the Cassini ISS. We propose that the former structures correspond to the peaks and troughs of the nonlinear wavetrains that form naturally in a viscously overstable disk. The latter variations on longer scales may correspond to modulations and defects in the wavetrains' amplitudes and wavelength. We explore these ideas using a simple hydrodynamical model which captures the correct qualitative behaviour of a disk of inelastically colliding particles, while also permitting us to make progress with analytic and semi-analytic techniques. Specifically, we calculate a family of travelling nonlinear density waves and determine their stability properties. Detailed numerical simulations that confirm our basic results will appear in a following paper.
description: 52 pages, 8 figures. Accepted in Icarus
Terahertz photoresponse of a quantum Hall edge-channel diode
Creators: name: Notthoff, Christian
name: Rachor, Kevin
name: Heitmann, Detlef
name: Lorke, Axel
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The Teraherz (THz) photoresponse of a two-dimensional electron gas in the quantum Hall regime is investigated. We use a sample structure which is topologically equivalent to a Corbino geometry combined with a cross-gate technique. This quasi-Corbino geometry allows us to directly investigate the THz-induced transport between adjacent edge-states, thus avoiding bulk effects. We find a pronounced photo voltage at zero applied bias, which rapidly decreases when an external current bias is applied. The photo voltage and its dependence on the bias current can be described using the model of an illuminated photodiode, resulting from the reconstruction of the Landau bands at the sample edge. Using the sample as a detector in a Fourier transform spectrometer setup, we find a resonant response from which we extract a reduced effective cyclotron mass. The findings support a non-bolometric mechanism of the induced photo voltage and the proposed edge-channel diode model.
description: 5 pages, 5 eps-figures, accepted for Phys. Rev. B
Conformal Inflation, Modulated Reheating, and WMAP5
Creators: name: Kobayashi, Takeshi
name: Mukohyama, Shinji
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate density perturbations generated through modulated reheating while inflation is driven by a conformally coupled scalar field. A large running of the spectral index is obtained, which reflects the basic nature of conformal inflation that higher-order time derivatives of the Hubble parameter during inflation are not necessarily small. This feature may allow us to distinguish between conformal inflation models and standard minimally coupled ones. We also investigate how the resulting fluctuations are modified when there is a deviation from an exact conformal coupling between the inflaton and gravity. Finally, we apply our results to the warped brane inflation model and see that observational bounds from the WMAP5 data suggest a blue tilted density perturbation spectrum.
description: 7 pages, REVTeX4, v2: published version
Agroforestry in the EU Forest Strategy
Creators: name: den HERDER
name: KAY
name: LAWSON
name: WORMS
Publisher: name: Zenodo
Year: 2020
Subjects: Environmental stress
TOF

description: While EURAF welcomes mentions of agroforestry in the Forestry Strategy 2030, we note that the two previous strategies have also stressed the importance of agroforestry without converting this to targets in their Forestry Action Plans.  Trees outside Forests (ToF) are crucial to Europe's environment and to climate adaptation and mitigation strategies. However, Member States are very bad at monitoring and valueing them. Proposals are given to focus tree planting on current "tree deserts", which are also the areas of greatest environmental stress.  Taking the priority areas, with 4-5 environmental stresses, EURAF estimates that an additional 3.13 million trees should be planted outside the forest by  2030.
description: EURAF Policy Briefing #2
Mixing Time and Stationary Expected Social Welfare of Logit Dynamics
Creators: name: Auletta, Vincenzo
name: Ferraioli, Diodato
name: Pasquale, Francesco
name: Persiano, Giuseppe
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: We study "logit dynamics" [Blume, Games and Economic Behavior, 1993] for strategic games. This dynamics works as follows: at every stage of the game a player is selected uniformly at random and she plays according to a "noisy" best-response where the noise level is tuned by a parameter $β$. Such a dynamics defines a family of ergodic Markov chains, indexed by $β$, over the set of strategy profiles. We believe that the stationary distribution of these Markov chains gives a meaningful description of the long-term behavior for systems whose agents are not completely rational. Our aim is twofold: On the one hand, we are interested in evaluating the performance of the game at equilibrium, i.e. the expected social welfare when the strategy profiles are random according to the stationary distribution. On the other hand, we want to estimate how long it takes, for a system starting at an arbitrary profile and running the logit dynamics, to get close to its stationary distribution; i.e., the "mixing time" of the chain. In this paper we study the stationary expected social welfare for the 3-player CK game, for 2-player coordination games, and for two simple $n$-player games. For all these games, we also give almost tight upper and lower bounds on the mixing time of logit dynamics. Our results show two different behaviors: in some games the mixing time depends exponentially on $β$, while for other games it can be upper bounded by a function independent of $β$.
description: 28 pages
Optimal generation of indistinguishable photons from non-identical artificial molecules
Creators: name: Cancellieri, E.
name: Troiani, F.
name: Goldoni, G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show theoretically that nearly indistinguishable photons can be generated with non-identical semiconductor-based sources. The use of virtual Raman transitions and the optimization of the external driving fields increases the tolerance to spectral inhomogeneity to the meV energy range. A trade-off emerges between photon indistinguishability and efficiency in the photon-generation process. Linear (quadratic) dependence of the coincidence probability within the Hong-Ou-Mandel setup is found with respect to the dephasing (relaxation) rate in the semiconductor sources.
Additional file 7 of Transcriptomic analysis of flower opening response to relatively low temperatures in Osmanthus fragrans
Creators: name: Fu, Jianxin
name: Zhang, Chao
name: Liu, Yucheng
name: Pang, Tianhong
name: Dong, Bin
name: Gao, Xiaoyue
name: Zhu, Yimin
name: Zhao, Hongbo
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Plant Biology

description: Additional file 7: Table S4. Annotation results of the assembled unigenes from the reference transcriptome against public databases.
Non-analytic spin susceptibility of a nested Fermi liquid: the case of Fe-based pnictides
Creators: name: Korshunov, M. M.
name: Eremin, I.
name: Efremov, D. V.
name: Maslov, D. L.
name: Chubukov, A. V.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose an explanation of the peculiar linear temperature dependence of the uniform spin susceptibility $χ(T)$ in ferropnictides. We argue that the linear in $T$ term appears due to non-analytic temperature dependence of $χ(T)$ in a two-dimensional Fermi liquid. We show that the prefactor of the $T$ term is expressed via the square of the spin-density-wave (SDW) amplitude connecting nested hole and electron pockets. Due to an incipient SDW instability, this amplitude is large, which, along with a small value of the Fermi energy, makes the $T$ dependence of $χ(T)$ strong. We demonstrate that this mechanism is in quantitative agreement with the experiment.
description: 4.1 pages, 2 figures
Multiple Multiple Prediction Combination and Confidence Measures for Marine Object Detection
Creators: name: Horton, MP
Publisher: name: University Of Tasmania
Year: 2023
Subjects: Computer vision

description: This thesis considers two problems in classification – a field within artificial intelli- gence. One is the general problem of classifier learning, for which a meta-classification technique called ‘virtual attribute subsetting’ is developed and tested. The other is ob- ject detection, with emphasis on marine creature detection, using the ‘Haar Classifier Cascade’ method (Viola & Jones, 2001b). Haar Classifier Cascades are built from a feature set of simple rectangular patterns of relative light and dark. Adaptive boosting selects those features that best tell the difference between objects and non-objects. In this thesis, a new cascade confidence measure is proposed, equivalent to the boosting ‘margin’; it uses information about how well the cascade features match the image region being classified. Tests on the common application of face detection show that this confidence measure improves detection accuracy. Virtual attribute subsetting is also used to modify the cascade; it further improves accuracy at the expense of classification time. In addition, Haar Classifier Cascades are trained to detect two types of marine animal (fish and seahorses). This requires object detection across a wide range of ori- entations, so approaches using both image and cascade rotation are compared. Results show that image rotation is more accurate than cascade rotation, and that cascades trained to detect objects over a range of angles should have their training images randomly perturbed over a similar (but not always equal) range. Confidence-based detections are also made and show themselves to be more accurate than binary de- tection. The confidence-based results sum the confidences from similar detections and show that confidence measurements from multiple Haar Classifier Cascades may be combined effectively. Seahorse detection poses an additional problem: seahorses are too flexible to be found by single cascades in any orientation. To solve this, separate seahorse head and body detectors are trained and their detections matched to create whole seahorse detections. Both designed and learnt matching cost formulae are created and two matching algorithms are implemented to link together head and body detections given a cost measurement. The best of the resulting whole seahorse detectors is more accurate vi than either of the component part detectors. The confidence measurement and virtual attribute subsetting algorithms make no use of domain knowledge, so should improve the accuracy of most other Haar Classifier Cascades. They also have the unusual property of being applicable to already learnt classifiers.
The spatial distribution of galaxies within the CMB cold spot in the Corona Borealis supercluster
Creators: name: Padilla-Torres, C. P.
name: Gutierrez, C. M.
name: Rebolo, R.
name: Genova-Santos, R.
name: Rubino-Martin, J. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the spatial distribution and colours of galaxies within the region covered by the cold spot in the cosmic microwave background (CMB) recently detected by the Very Small Array (VSA; Genova-Santos et al. 2005, 2008) towards the Corona Borealis supercluster (CrB-SC). The spot is in the northern part of a region with a radius ~1 degree (~5 Mpc at the redshift of CrB-SC) enclosing the clusters Abell 2056, 2065, 2059 and 2073, and where the density of galaxies, excluding the contribution from those clusters, is ~2 times higher than the mean value in typical intercluster regions of the CrB-SC. Two of such clusters (Abell 2056 and 2065) are members of the CrB-SC, while the other two are in the background. This high density intercluster region is quite inhomogeneous, being the most remarkable feature a large concentration of galaxies in a narrow filament running from Abell 2065 with a length of ~35 arcmin (~3 Mpc at the redshift of CrB-SC) in the SW-NE direction. This intercluster population of galaxies probably results from the interaction of clusters Abell 2065 and 2056. The area subtended by the VSA cold spot shows an excess of faint (21
description: Accepted for publication in MNRAS
Effect of next-nearest neighbor coupling on the optical spectra in bilayer graphene
Creators: name: Wright, A. R.
name: Liu, Feng
name: Zhang, C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the dependence of the optical conductivity of bilayer graphene (BLG) on the intra- and inter-layer interactions using the most complete model to date. We show that the next nearest-neighbor intralayer coupling introduces new features in the low-energy spectrum that are highly sensitive to sample doping, changing significantly the ``universal'' conductance. Further, its interplay with interlayer couplings leads to an anisotropy in conductance in the ultraviolet range. We propose that experimental measurement of the optical conductivity of intrinsic and doped BLG will provide a good benchmark for the relative importance of intra- and inter-layer couplings at different doping levels.
description: 5 pages, 5 figures
The $Λ(1405)$ as a Hybrid
Creators: name: Kisslinger, Leonard S.
name: Henley, Ernest M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using the QCD Sum Rule Method, we estimate the mass of the lowest strange hybrid baryon with $IJ^P=0(1/2)^-$. We find the mass is approximately that of the $Λ(1405)$, whose nature has been a puzzle for many decades. Possible tests of this result are discussed.
description: fourteen pages seven figures
Capturing simple and complex time-dependent effects using flexible parametric survival models: A simulation study
Creators: name: Bower, Hannah
name: Crowther, Michael J.
name: Rutherford, Mark J.
name: Andersson, Therese M.-L.
name: Clements, Mark
name: Liu, Xing-Rong
name: Dickman, Paul W.
name: Lambert, Paul C.
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: Non-proportional hazards are common within time-to-event data and can be modeled using restricted cubic splines in flexible parametric survival models. This simulation study assesses the ability of these models in capturing non-proportional hazards, and the ability of the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) in selecting degrees of freedom. The simulation results for scenarios with differing complexities showed little bias in the survival and hazard functions for simple scenarios; bias increased in complex scenarios when fewer degrees of freedom were modeled. Neither AIC nor BIC consistently performed better and both generally selected models with little bias.
Podpora Mreže občanske znanosti prijaviteljem na evropske razpise: dogodek 'Izmenjava dobrih praks na temo 'Vključenost državljanov, civilne družbe in končnih uporabnikov v evropske projekte''
Creators: name: V. Iskrić, Mitja
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Citizen Science
subject: občanska znanost

description: Predstavitev podpore Mreže občanske znanosti prijaviteljem na evropske razpise 

Mitja V. Iskrić, Centralna tehniška knjižnica Univerze v Ljubljani
A new description of orthogonal bases
Creators: name: Coecke, Bob
name: Pavlovic, Dusko
name: Vicary, Jamie
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Logic (math.LO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We show that an orthogonal basis for a finite-dimensional Hilbert space can be equivalently characterised as a commutative dagger-Frobenius monoid in the category FdHilb, which has finite-dimensional Hilbert spaces as objects and continuous linear maps as morphisms, and tensor product for the monoidal structure. The basis is normalised exactly when the corresponding commutative dagger-Frobenius monoid is special. Hence orthogonal and orthonormal bases can be axiomatised in terms of composition of operations and tensor product only, without any explicit reference to the underlying vector spaces. This axiomatisation moreover admits an operational interpretation, as the comultiplication copies the basis vectors and the counit uniformly deletes them. That is, we rely on the distinct ability to clone and delete classical data as compared to quantum data to capture basis vectors. For this reason our result has important implications for categorical quantum mechanics.
Exponential localization in one-dimensional quasiperiodic optical lattices
Creators: name: Modugno, Michele
Publisher: name: arXiv
Year: 2009
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We investigate the localization properties of a one-dimensional bichromatic optical lattice in the tight binding regime, by discussing how exponentially localized states emerge upon changing the degree of commensurability. We also review the mapping onto the discrete Aubry-Andre' model, and provide evidences on how the momentum distribution gets modified in the crossover from extended to exponentially localized states. This analysis is relevant to the recent experiment on Anderson localization of a noninteracting Bose-Einstein condensate in a quasiperiodic optical lattice [G. Roati et al., Nature 453, 895 (2008)].
description: 13 pages, 6 figures
Capturing simple and complex time-dependent effects using flexible parametric survival models: A simulation study
Creators: name: Bower, Hannah
name: Crowther, Michael J.
name: Rutherford, Mark J.
name: Andersson, Therese M.-L.
name: Clements, Mark
name: Liu, Xing-Rong
name: Dickman, Paul W.
name: C. Lambert, Paul
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: Non-proportional hazards are common within time-to-event data and can be modeled using restricted cubic splines in flexible parametric survival models. This simulation study assesses the ability of these models in capturing non-proportional hazards, and the ability of the Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) in selecting degrees of freedom. The simulation results for scenarios with differing complexities showed little bias in the survival and hazard functions for simple scenarios; bias increased in complex scenarios when fewer degrees of freedom were modeled. Neither AIC nor BIC consistently performed better and both generally selected models with little bias.
F-Theory Grand Unification at the Colliders
Creators: name: Li, Tianjun
name: Maxin, James A.
name: Nanopoulos, Dimitri V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We predict the exact gaugino mass relation near the electroweak scale at one loop for gravity mediated supersymmetry breaking in F-theory SU(5) and SO(10) models with U(1)_Y and U(1)_{B-L} fluxes, respectively. The gaugino mass relation introduced here differs from the typical gaugino mass relations studied thus far, and in general, should be preserved quite well at low energy. Therefore, these F-Theory models can be tested at the Large Hadron Collider and future International Linear Collider. We present two typical scenarios that satisfy all the latest experimental constraints and are consistent with the CDMS II experiment. In particular, the gaugino mass relation is indeed satisfied at two-loop level with only a very small deviation around the electroweak scale.
description: RevTex4, 6 pages, 6 figures
Propagation of twist solitons in real DNA chains
Creators: name: Cadoni, M.
name: De Leo, R.
name: Demelio, S.
name: Gaeta, G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Biomolecules (q-bio.BM)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: We report on numerical investigations concerning the propagation of solitons in a real DNA chain (the Human Adenovirus 2) using a realistic model of DNA torsional dynamics; this takes fully into account the inhomogeneities in the real chain. We find that twist solitons propagate for considerable distances (2-10 times their diameters) before stopping due to phonon emission. Our results show that twist solitons may exist in real DNA chains; and on a more general level that solitonic propagation can take place in highly inhomogeneous media.
description: 6 pages, 3 figures
A nonperturbative calculation of the electron's magnetic moment with truncation extended to two photons
Creators: name: Chabysheva, S. S.
name: Hiller, J. R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The Pauli--Villars (PV) regularization scheme is applied to a calculation of the dressed-electron state and its anomalous magnetic moment in light-front-quantized quantum electrodynamics (QED) in Feynman gauge. The regularization is provided by heavy, negative-metric fields added to the Lagrangian. The light-front QED Hamiltonian then leads to a well-defined eigenvalue problem for the dressed-electron state expressed as a Fock-state expansion. The Fock-state wave functions satisfy coupled integral equations that come from this eigenproblem. A finite system of equations is obtained by truncation to no more than two photons and no positrons; this extends earlier work that was limited to dressing by a single photon. Numerical techniques are applied to solve the coupled system and compute the anomalous moment, for which we obtain agreement with experiment, within numerical errors, but observe a small systematic discrepancy that should be due to the absence of electron-positron loops and of three-photon self-energy effects. We also discuss the prospects for application of the method to quantum chromodynamics.
description: 33 pages, 9 figures, RevTeX 4.1; corrected typos and updated references
Modeling Nonlinear Evolution of Baryon Acoustic Oscillations: Convergence Regime of N-body Simulations and Analytic Models
Creators: name: Nishimichi, Takahiro
name: Shirata, Akihito
name: Taruya, Atsushi
name: Yahata, Kazuhiro
name: Saito, Shun
name: Suto, Yasushi
name: Takahashi, Ryuichi
name: Yoshida, Naoki
name: Matsubara, Takahiko
name: Sugiyama, Naoshi
name: Kayo, Issha
name: Jing, Yipeng
name: Yoshikawa, Kohji
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use a series of cosmological N-body simulations and various analytic models to study the evolution of the matter power spectrum in real space in a ΛCold Dark Matter universe. We compare the results of N-body simulations against three analytical model predictions; standard perturbation theory, renormalized perturbation theory, and the closure approximation. We include the effects from finite simulation box size in the comparison. We determine the values of the maximum wavenumbers, k^{lim}_{1%} and k^{lim}_{3%}, below which the analytic models and the simulation results agree to within 1 and 3 percent, respectively. We then provide a simple empirical function which describes the convergence regime determined by comparison between our simulations and the analytical models. We find that if we use the Fourier modes within the convergence regime alone, the characteristic scale of baryon acoustic oscillations can be determined within 1% accuracy from future surveys with a volume of a few h^{-3}Gpc^3 at z\sim1 or z\sim3 in the absence of any systematic distortion of the power spectrum.
description: 23 pages, 14 figures, accepted by PASJ
Deep-Sea Acoustic Neutrino Detection and the AMADEUS System as a Multi-Purpose Acoustic Array
Creators: name: Lahmann, Robert
Publisher: name: arXiv
Year: 2009
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The use of conventional neutrino telescope methods and technology for detecting neutrinos with energies above 1 EeV from astrophysical sources would be prohibitively expensive and may turn out to be technically not feasible. Acoustic detection is a promising alternative for future deep-sea neutrino telescopes operating in this energy regime. It utilises the effect that the energy deposit of the particle cascade evolving from a neutrino interaction in water generates a coherently emitted sound wave with frequency components in the range between about 1 and 50 kHz. The AMADEUS (Antares Modules for Acoustic DEtection Under the Sea) project is integrated into the ANTARES neutrino telescope and aims at the investigation of techniques for acoustic particle detection in sea water. The acoustic sensors of AMADEUS are using piezo elements and are recording a broad-band signal with frequencies ranging up to 125 kHz. After an introduction to acoustic neutrino detection it will be shown how an acoustic array similar to AMADEUS can be used for positioning as well as acoustic particle detection. Experience from AMADEUS and possibilities for a future large scale neutrino telescope in the Mediterranean Sea will be discussed.
description: Proceedings of the VLVnT08 workshop (http://marwww.in2p3.fr/VLVnT08/), April 2008
Spin-dependent Cooper Pair Phase and Pure Spin Supercurrents in Strongly Polarized Ferromagnets
Creators: name: Grein, R.
name: Eschrig, M.
name: Metalidis, G.
name: Schön, Gerd
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study heterostructures of singlet superconductors (SC) and strongly spin-polarized ferromagnets (sFM) and show that a relative phase arises between the superconducting proximity amplitudes in the two ferromagnetic spin bands. We find a tunable pure spin supercurrent in a sFM contacted with only one SC electrode. We show that Josephson junctions are most effective for a spin polarization $P\sim 0.3$, and that critical currents for positive and negative bias differ for a high transmission Josephson junction, due to a relative phase between single and double pair transmission.
description: accepted for publication in PRL
Observation of quantum diffractive collisions using shallow atomic traps
Creators: name: Fagnan, David E.
name: Wang, Jicheng
name: Zhu, Chenchong
name: Djuricanin, Pavle
name: Klappauf, Bruce G.
name: Booth, James L.
name: Madison, Kirk W.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present measurements and calculations of the trap loss rate for laser cooled Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap when exposed to a room temperature background gas of Ar. We study the loss rate as a function of trap depth and find that copious glancing elastic collisions, which occur in the so-called quantum-diffractive regime and impart very little energy to the trapped atoms, result in significant differences in the loss rate for the MOT compared to a pure magnetic trap due solely to the difference in potential depth. This finding highlights the importance of knowing the trap depth when attempting to infer the total collision cross section from measurements of trap loss rates. Moreover, this variation of trap loss rate with trap depth can be used to extract information about the differential cross section.
description: 9 pages, 9 figures
Entangling gates in even Euclidean lattices such as the Leech lattice
Creators: name: Planat, Michel
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Group Theory (math.GR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The group of automorphisms of Euclidean (embedded in $\mathbb{R}^n$) dense lattices such as the root lattices $D_4$ and $E_8$, the Barnes-Wall lattice $BW_{16}$, the unimodular lattice $D_{12}^+$ and the Leech lattice $Λ_{24}$ may be generated by entangled quantum gates of the corresponding dimension. These (real) gates/lattices are useful for quantum error correction: for instance, the two and four-qubit real Clifford groups are the automorphism groups of the lattices $D_4$ and $BW_{16}$, respectively, and the three-qubit real Clifford group is maximal in the Weyl group $W(E_8)$. Technically, the automorphism group $Aut(Λ)$ of the lattice $Λ$ is the set of orthogonal matrices $B$ such that, following the conjugation action by the generating matrix of the lattice, the output matrix is unimodular (of determinant $\pm 1$, with integer entries). When the degree $n$ is equal to the number of basis elements of $Λ$, then $Aut(Λ)$ also acts on basis vectors and is generated with matrices $B$ such that the sum of squared entries in a row is one, i.e. $B$ may be seen as a quantum gate. For the dense lattices listed above, maximal multipartite entanglement arises. In particular, one finds a balanced tripartite entanglement in $E_8$ (the two- and three- tangles have equal magnitude 1/4) and a GHZ type entanglement in BW$_{16}$. In this paper, we also investigate the entangled gates from $D_{12}^+$ and $Λ_{24}$, by seeing them as systems coupling a qutrit to two- and three-qubits, respectively. Apart from quantum computing, the work may be related to particle physics in the spirit of \cite{PLS2010}.
description: 11 pages, second updated version
Extinction statistics in N random interacting species
Creators: name: Fiasconaro, Alessandro
name: Spagnolo, Bernardo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A randomly interacting N-species Lotka-Volterra system in the presence of a Gaussian multiplicative noise is analyzed. The investigation is focused on the role of this external noise into the statistical properties of the extinction times of the populations. The distributions show a Gaussian shape for each noise intensity value investigated. A monotonic behavior of the mean extinction time as a function of the noise intensity is found, while a nonmonotonic behavior of the width of the extinction time probability distribution characterizes the dynamical evolution.
description: 9 pages, 4 figures, Presented at the 19th Marian Smoluchowski Symposium on Statistical Physics, Krakow, Poland, May 14-17, 2006
Introduction to the Standard Model and Electroweak Physics
Creators: name: Langacker, Paul
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: A concise introduction is given to the standard model, including the structure of the QCD and electroweak Lagrangians, spontaneous symmetry breaking, experimental tests, and problems.
description: Lectures presented at TASI2008. 45 pages, 14 figures, 5 tables
Existence and Stability of Symmetric Periodic Simultaneous Binary Collision Orbits in the Planar Pairwise Symmetric Four-Body Problem
Creators: name: Bakker, Lennard F.
name: Ouyang, Tiancheng
name: Yan, Duokui
name: Simmons, Skyler
Publisher: name: arXiv
Year: 2010
Subjects: subject: Dynamical Systems (math.DS)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 70F10, 70H12, 70H14, 70F16, 70H33

description: We extend our previous analytic existence of a symmetric periodic simultaneous binary collision orbit in a regularized fully symmetric equal mass four-body problem to the analytic existence of a symmetric periodic simultaneous binary collision orbit in a regularized planar pairwise symmetric equal mass four-body problem. We then use a continuation method to numerically find symmetric periodic simultaneous binary collision orbits in a regularized planar pairwise symmetric 1, m, 1, m four-body problem for $m$ between 0 and 1. Numerical estimates of the the characteristic multipliers show that these periodic orbits are linearly stability when $0.54\leq m\leq 1$, and are linearly unstable when $0
description: 6 figures