cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Predictive coupled-cluster isomer orderings for some Si${}_n$C${}_m$ ($m, n\le 12$) clusters; A pragmatic comparison between DFT and complete basis limit coupled-cluster benchmarks
Creators: name: Byrd, Jason N.
name: Lutz, Jesse J.
name: Jin, Yifan
name: Ranasinghe, Duminda S.
name: Montgomery, John A.
name: Perera, Ajith
name: Duan, Xiaofeng F.
name: Burggraf, Larry W.
name: Sanders, Beverly A.
name: Bartlett, Rodney J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The accurate determination of the preferred ${\rm Si}_{12}{\rm C}_{12}$ isomer is important to guide experimental efforts directed towards synthesizing SiC nano-wires and related polymer structures which are anticipated to be highly efficient exciton materials for opto-electronic devices. In order to definitively identify preferred isomeric structures for silicon carbon nano-clusters, highly accurate geometries, energies and harmonic zero point energies have been computed using coupled-cluster theory with systematic extrapolation to the complete basis limit for set of silicon carbon clusters ranging in size from SiC$_3$ to ${\rm Si}_{12}{\rm C}_{12}$. It is found that post-MBPT(2) correlation energy plays a significant role in obtaining converged relative isomer energies, suggesting that predictions using low rung density functional methods will not have adequate accuracy. Utilizing the best composite coupled-cluster energy that is still computationally feasible, entailing a 3-4 SCF and CCSD extrapolation with triple-$ζ$ (T) correlation, the {\it closo} ${\rm Si}_{12}{\rm C}_{12}$ isomer is identified to be the preferred isomer in support of previous calculations [J. Chem. Phys. 2015, 142, 034303]. Additionally we have investigated more pragmatic approaches to obtaining accurate silicon carbide isomer energies, including the use of frozen natural orbital coupled-cluster theory and several rungs of standard and double-hybrid density functional theory. Frozen natural orbitals as a way to compute post MBPT(2) correlation energy is found to be an excellent balance between efficiency and accuracy.
Capacity estimation and verification of quantum channels with arbitrarily correlated errors
Creators: name: Pfister, Corsin
name: Rol, M. Adriaan
name: Mantri, Atul
name: Tomamichel, Marco
name: Wehner, Stephanie
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: One of the main figures of merit for quantum memories and quantum communication devices is their quantum capacity. It has been studied for arbitrary kinds of quantum channels, but its practical estimation has so far been limited to devices that implement independent and identically distributed (i.i.d.) quantum channels, where each qubit is affected by the same noise process. Real devices, however, typically exhibit correlated errors. Here, we overcome this limitation by presenting protocols that estimate a channel's one-shot quantum capacity for the case where the device acts on (an arbitrary number of) qubits. The one-shot quantum capacity quantifies a device's ability to store or communicate quantum information, even if there are correlated errors across the different qubits. We present a protocol which is easy to implement and which comes in two versions. The first version estimates the one-shot quantum capacity by preparing and measuring in two different bases, where all involved qubits are used as test qubits. The second version verifies on-the-fly that a channel's one-shot quantum capacity exceeds a minimal tolerated value while storing or communicating data, therefore combining test qubits and data qubits in one protocol. We discuss the performance of our method using simple examples, such as the dephasing channel for which our method is asymptotically optimal. Finally, we apply our method to estimate the one-shot capacity in an experiment using a transmon qubit.
description: 9+13 pages, 10 figures, see dataAnalysisScript (analysis.py and readme.txt) for a Python script that applies this method to your experimental data
On the symplectic size of convex polytopes
Creators: name: Haim-Kislev, Pazit
Publisher: name: arXiv
Year: 2017
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: In this paper we introduce a combinatorial formula for the Ekeland-Hofer-Zehnder capacity of a convex polytope in $\mathbb{R}^{2n}$. One application of this formula is a certain subadditivity property of this capacity.
Letter from Gordon Clark to John Betjeman, May 05, 1971
Creators: name: Clark, Gordon
name: Betjeman, John, 1906-1984
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Betjeman, John, 1906-1984
valueUri: http://id.worldcat.org/fast/1427507
subject: Clark, Gordon
subject: Modernism (Literature)
valueUri: http://id.worldcat.org/fast/1024455
subject: Authors, English--Correspondence
valueUri: http://id.worldcat.org/fast/821953
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Television journalists
valueUri: http://id.worldcat.org/fast/1146949
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870

description: Correspondence between John Betjeman and Gordon Clark. Clark invites Betjeman to read some of his poetry at the Abbotsholme Arts & Film Society. Also enclosed is Betjeman's reply (July 12, 1971): Betjeman replies that he unfortunately won't be able to as he will be in Australia for work, and won't be back until the following year.
Superconducting nanowire detector jitters limited by detector geometry
Creators: name: Calandri, Niccolò
name: Zhao, Qing-Yuan
name: Zhu, Di
name: Dane, Andrew
name: Berggren, Karl K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Detection jitter quantifies variance introduced by the detector in the determination of photon arrival time. It is a crucial performance parameter for systems using superconducting nanowire single photon detectors (SNSPDs). In this work, we have demonstrated that the detection timing jitter is limited in part by the spatial variation of photon detection events along the length of the wire. This distribution causes the generated electrical pulses to arrive at the readout at varied times. We define this jitter source as geometric jitter since it is related to the length and area of the SNSPD. To characterize the geometric jitter, we have constructed a novel differential cryogenic readout with less than 7 ps of electronic jitter that can amplify the pulses generated from the two ends of an SNSPD. By differencing the measured arrival times of the two electrical pulses, we were able to partially cancel out the difference of the propagation times and thus reduce the uncertainty of the photon arrival time. Our experimental data indicates that the variation of the differential propagation time was a few ps for a 3 μm x 3 μm device while it increased up to 50 ps for a 20 μm x 20 μm device. In a 20 μm x 20 μm large SNSPD, we achieved a 20% reduction in the overall detection timing jitter for detecting telecom-wavelength photons by using the differential cryogenic readout. The geometric jitter hypothesis was further confirmed by studying jitter in devices that consisted of long wires with 1-μm-long narrowed regions used for sensing photons.
The role of education in the life of Sengki slum dwellers
Creators: name: Naksook, Charin
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the Reference field.
Compactness of Kähler metrics with bounds on Ricci curvature and I functional
Creators: name: Chen, Xiuxiong
name: Darvas, Tamás
name: He, Weiyong
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: We prove a compactness theorem for Kähler metrics with various bounds on Ricci curvature and the $\mathcal I$ functional. We explore applications of our result to the continuity method and the Calabi flow.
L^1 metric geometry of big cohomology classes
Creators: name: Darvas, Tamás
name: Di Nezza, Eleonora
name: Lu, Chinh H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Suppose $(X,ω)$ is a compact Kähler manifold of dimension $n$, and $θ$ is closed $(1,1)$-form representing a big cohomology class. We introduce a metric $d_1$ on the finite energy space $\mathcal{E}^1(X,θ)$, making it a complete geodesic metric space. This construction is potentially more rigid compared to its analog from the Kähler case, as it only relies on pluripotential theory, with no reference to infinite dimensional $L^1$ Finsler geometry. Lastly, by adapting the results of Ross and Witt Nyström to the big case, we show that one can construct geodesic rays in this space in a flexible manner.
description: v2. published version
Multipoint Okounkov bodies
Creators: name: Trusiani, Antonio
Publisher: name: arXiv
Year: 2018
Subjects: subject: Algebraic Geometry (math.AG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Starting from the data of a big line bundle $L$ on a projective manifold $X$ with a choice of $N\geq 1$ different points on $X$ we provide a new construction of $N$ Okounkov bodies which encodes important geometric features of ($L\to X,p_{1},\dots,p_{N}$) such as the volume of $L$, the (moving) multipoint Seshadri constant of $L$ at $p_{1},\dots,p_{N}$, and the possibility to construct Kähler packings centered at $p_{1},\dots,p_{N}$. Toric manifolds and surfaces are examined in detail.
description: Final version, to appear in "Annales de l'Institut Fourier"
Extracting Lungs from CT Images using Fully Convolutional Networks
Creators: name: Alves, Jeovane Honório
name: Neto, Pedro Martins Moreira
name: de Oliveira, Lucas Ferrari
Publisher: name: arXiv
Year: 2018
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Analysis of cancer and other pathological diseases, like the interstitial lung diseases (ILDs), is usually possible through Computed Tomography (CT) scans. To aid this, a preprocessing step of segmentation is performed to reduce the area to be analyzed, segmenting the lungs and removing unimportant regions. Generally, complex methods are developed to extract the lung region, also using hand-made feature extractors to enhance segmentation. With the popularity of deep learning techniques and its automated feature learning, we propose a lung segmentation approach using fully convolutional networks (FCNs) combined with fully connected conditional random fields (CRF), employed in many state-of-the-art segmentation works. Aiming to develop a generalized approach, the publicly available datasets from University Hospitals of Geneva (HUG) and VESSEL12 challenge were studied, including many healthy and pathological CT scans for evaluation. Experiments using the dataset individually, its trained model on the other dataset and a combination of both datasets were employed. Dice scores of $98.67\%\pm0.94\%$ for the HUG-ILD dataset and $99.19\%\pm0.37\%$ for the VESSEL12 dataset were achieved, outperforming works in the former and obtaining similar state-of-the-art results in the latter dataset, showing the capability in using deep learning approaches.
description: Accepted for presentation at the International Joint Conference on Neural Networks (IJCNN) 2018
Teknik Navigasi Referensi
Creators: name: Gunawan, Fahmi
Publisher: name: Zenodo
Year: 2023
Subjects: Penelitian
Publikasi
Referensi
Bibliometrik

description: Presentasi ini membahas dua hal. Pertama, mengapa referensi penting dan Kedua, bagaimana teknik melakukan navigasi untuk publikasi artikel baik yang berskala nasional maupun internasional. Teknik melakukan navigasi itu mencakup navigasi berbasis penerbit nasional dan internasional, navigasi berbasis indeksasi, navigasi berbasis bibliometrik, dan navigasi berbasis media sosial.
Mahler's work on Diophantine equations and subsequent developments
Creators: name: Evertse, Jan-Hendrik
name: Győry, Kálmán
name: Stewart, Cameron L.
Publisher: name: arXiv
Year: 2018
Subjects: subject: History and Overview (math.HO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11D25, 11D45, 11D57, 11D59, 11D61, 11J61, 11J68

description: We discuss Mahler's work on Diophantine approximation and its applications to Diophantine equations, in particular Thue-Mahler equations, S-unit equations and S-integral points on elliptic curves, and go into later developments concerning the number of solutions to Thue-Mahler equations and effective finiteness results for Thue-Mahler equations. For the latter we need estimates for p-adic logarithmic forms, which may be viewed as an outgrowth of Mahler's work on the p-adic Gel'fond-Schneider theorem. We also go briefly into decomposable form equations, these are certain higher dimensional generalizations of Thue-Mahler equations.
description: 26 pages. This paper will appear in "Mahler Selecta", a volume dedicated to the work of Kurt Mahler and its impact
Gain spectroscopy of a type-II VECSEL chip
Creators: name: Lammers, Christian
name: Stein, Markus
name: Berger, Christian
name: Möller, Christoph
name: Fuchs, Christian
name: Perez, Antje Ruiz
name: Rahimi-Iman, Arash
name: Hader, Jörg
name: Moloney, Jerome
name: Stolz, Wolfgang
name: Koch, Stephan W.
name: Koch, Martin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Using optical pump-white light probe spectroscopy the gain dynamics is investigated for a VECSEL chip which is based on a type-II heterostructure. The active region the chip consists of a GaAs/(GaIn)As/Ga(AsSb)/(GaIn)As/GaAs multiple quantum well. For this structure, a fully microscopic theory predicts a modal room temperature gain at a wavelength of 1170 nm, which is confirmed by experimental spectra. The results show a gain buildup on the type-II chip which is delayed relative to that of a type-I chip. This slower gain dynamics is attributed to a diminished cooling rate arising from reduced electron-hole scattering.
description: 4 pages, 4 figures
Predicting vocational achievement following spinal cord injury
Creators: name: Murphy, Gregory C.
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the Reference field.
Radiative lifetimes of dipolar excitons in double quantum-wells
Creators: name: Mazuz-Harpaz, Yotam
name: Cohen, Kobi
name: Laikhtman, Boris
name: West, Ken
name: Pfeiffer, Loren N.
name: Rapaport, Ronen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Spatially indirect excitons in semiconducting double quantum wells have been shown to exhibit rich collective many-body behavior that result from the nature of the extended dipole-dipole interactions between particles. For many spectroscopic studies of the emission from a system of such indirect excitons, it is crucial to separate the single particle properties of the excitons from the many-body effects arising from their mutual interactions. In particular, knowledge of the relation between the emission energy of indirect excitons and their radiative lifetime could be highly beneficial for control, manipulation, and analysis of such systems. Here we study a simple analytic approximate relation between the radiative lifetime of indirect excitons and their emission energy. We show, both numerically and experimentally, the validity and the limits of this approximate relation. This relation between the emission energy and the lifetime of indirect excitons can be used to tune and determine their lifetime and their resulting dynamics without the need of directly measuring it, and as a tool for design of indirect exciton based devices.
description: * Added references. * Corrected the Al content mentioned as the sample's and used in Sec. II
Characterization of the scintillation anisotropy in crystalline stilbene scintillator detectors
Creators: name: Schuster, Patricia
name: Brubaker, Erik
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: This paper reports a series of measurements that characterize the directional dependence of the scintillation response of crystalline melt-grown and solution-grown stilbene to incident DT and DD neutrons. These measurements give the amplitude and pulse shape dependence on the proton recoil direction over one hemisphere of the crystal, confirming and extending previous results in the literature for melt-grown stilbene and providing the first measurements for solution-grown stilbene. In similar measurements of liquid and plastic detectors, no directional dependence was observed, confirming the hypothesis that the anisotropy in stilbene and other organic crystal scintillators is a result of internal effects due to the molecular or crystal structure and not an external effect on the measurement system.
Mahler's work on the geometry of numbers
Creators: name: Evertse, Jan-Hendrik
Publisher: name: arXiv
Year: 2018
Subjects: subject: History and Overview (math.HO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11H06, 11H16, 11H60

description: Mahler has written many papers on the geometry of numbers. Arguably, his most influential achievements in this area are his compactness theorem for lattices, his work on star bodies and their critical lattices, and his estimates for the successive minima of reciprocal convex bodies and compound convex bodies. We give a, by far not complete, overview of Mahler's work on these topics and their impact.
description: 17 pages. This paper will appear in "Mahler Selecta", a volume dedicated to the work of Kurt Mahler and its impact
Quantization in geometric pluripotential theory
Creators: name: Darvas, Tamás
name: Lu, Chinh H.
name: Rubinstein, Yanir A.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: The space of Kähler metrics can, on the one hand, be approximated by subspaces of algebraic metrics, while, on the other hand, can be enlarged to finite-energy spaces arising in pluripotential theory. The latter spaces are realized as metric completions of Finsler structures on the space of Kähler metrics. The former spaces are the finite-dimensional spaces of Fubini--Study metrics of Kähler quantization. The goal of this article is to draw a connection between the two. We show that the Finsler structures on the space of Kähler potentials can be quantized. More precisely, given a Kähler manifold polarized by an ample line bundle we endow the space of Hermitian metrics on powers of that line bundle with Finsler structures and show that the resulting path length metric spaces recover the corresponding metric completions of the Finsler structures on the space of Kähler potentials. This has a number of applications, among them a new approach to the rooftop envelopes and Pythagorean formulas of Kähler geometry, a new Lidskii type inequality on the space of Kähler metrics, and approximation of finite energy potentials, as well as geodesic segments by the corresponding smooth algebraic objects.
Time-Reversal Symmetry Breaking and Decoherence in Chaotic Dirac Billiards
Creators: name: Júnior, A. J. Nascimento
name: Barros, M. S. M.
name: Ramos, J. G. G. S.
name: Barbosa, A. L. R.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this work, we perform a statistical study on Dirac Billiards in the extreme quantum limit (a single open channel on the leads). Our numerical analysis uses a large ensemble of random matrices and demonstrates the preponderant role of dephasing mechanisms in such chaotic billiards. Physical implementations of these billiards range from quantum dots of graphene to topological insulators structures. We show, in particular, that the role of finite crossover fields between the universal symmetries quickly leaves the conductance to the asymptotic limit of unitary ensembles. Furthermore, we show that the dephasing mechanisms strikingly lead Dirac billiards from the extreme quantum regime to the semiclassical Gaussian regime.
Log-concavity of volume and complex Monge-Ampère equations with prescribed singularity
Creators: name: Darvas, Tamás
name: Di Nezza, Eleonora
name: Lu, Chinh H.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Let $(X,ω)$ be a compact Kähler manifold. We prove the existence and uniqueness of solutions to complex Monge-Ampère equations with prescribed singularity type. Compared to previous work, the assumption of small unbounded locus is dropped, and we work with general model type singularities. We state and prove our theorems in the context of big cohomology classes, however our results are new in the Kähler case as well. As an application we confirm a conjecture by Boucksom-Eyssidieux-Guedj-Zeriahi concerning log-concavity of the volume of closed positive $(1,1)$-currents. Finally, we show that log-concavity of the volume in complex geometry corresponds to the Brunn-Minkowski inequality in convex geometry, pointing out a dictionary between our relative pluripotential theory and $P$-relative convex geometry. Applications related to stability and existence of csck metrics are treated elsewhere.
description: v2. Examples added, no other significant changes v.3 Small changes in presentation. Final version
Noisy Non-Adaptive Group Testing: A (Near-)Definite Defectives Approach
Creators: name: Scarlett, Jonathan
name: Johnson, Oliver
Publisher: name: arXiv
Year: 2018
Subjects: subject: Information Theory (cs.IT)
subject: Probability (math.PR)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The group testing problem consists of determining a small set of defective items from a larger set of items based on a number of possibly-noisy tests, and is relevant in applications such as medical testing, communication protocols, pattern matching, and more. We study the noisy version of this problem, where the outcome of each standard noiseless group test is subject to independent noise, corresponding to passing the noiseless result through a binary channel. We introduce a class of algorithms that we refer to as Near-Definite Defectives (NDD), and study bounds on the required number of tests for asymptotically vanishing error probability under Bernoulli random test designs. In addition, we study algorithm-independent converse results, giving lower bounds on the required number of tests under Bernoulli test designs. Under reverse Z-channel noise, the achievable rates and converse results match in a broad range of sparsity regimes, and under Z-channel noise, the two match in a narrower range of dense/low-noise regimes. We observe that although these two channels have the same Shannon capacity when viewed as a communication channel, they can behave quite differently when it comes to group testing. Finally, we extend our analysis of these noise models to a general binary noise model (including symmetric noise), and show improvements over known existing bounds in broad scaling regimes.
description: IEEE Transactions on Information Theory, Volume 66, Issue 6, pp. 3775-3797, June 2020
Efficient, designable, and broad-bandwidth optical extinction via aspect-ratio-tailored silver nanodisks
Creators: name: Anquillare, E. L.
name: Miller, O. D.
name: Hsu, C. W.
name: DeLacy, B. G.
name: Joannopoulos, J. D.
name: Johnson, S. G.
name: Soljacic, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Subwavelength resonators, ranging from single atoms to metallic nanoparticles, typically exhibit a narrow-bandwidth response to optical excitations. We computationally design and experimentally synthesize tailored distributions of silver nanodisks to extinguish light over broad and varied frequency windows. We show that metallic nanodisks are two-to-ten-times more efficient in absorbing and scattering light than common structures, and can approach fundamental limits to broadband scattering for subwavelength particles. We measure broadband extinction per volume that closely approaches theoretical predictions over three representative visible-range wavelength windows, confirming the high efficiency of nanodisks and demonstrating the collective power of computational design and experimental precision for developing new photonics technologies.
description: arXiv admin note: substantial text overlap with arXiv:1510.01768. Withdrawn due to accidental double submission
On convergence of exterior solutions to radial Cauchy solutions for $\square_{1+3}U=0$
Creators: name: Jenssen, Helge Kristian
name: Tsikkou, Charis
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: Consider the Cauchy problem for the 3-d linear wave equation $\square_{1+3}U=0$ with radial initial data $U(0,x)=Φ(x)=ϕ(|x|)$, $U_t(0,x)=Ψ(x)=ψ(|x|)$. A standard result gives that $U$ belongs to $C([0,T];H^s(\mathbb{R}^3))$ whenever $(Φ,Ψ)\in H^s\times H^{s-1}(\mathbb{R}^3)$. In this note we are interested in the question of how $U$ can be realized as a limit of solutions to initial-boundary value problems on the exterior of vanishing balls $B_\varepsilon$ about the origin. We note that, as the solutions we compare are defined on different domains, the answer is not an immediate consequence of $H^s$ well-posedness for the wave equation. We show how explicit solution formulae yield convergence and optimal regularity for the Cauchy solution via exterior solutions, when the latter are extended continuously as constants on $B_\varepsilon$ at each time. We establish that for $s=2$ the solution $U$ can be realized as an $H^2$-limit (uniformly in time) of exterior solutions on $\mathbb{R}^3\setminus B_\varepsilon$ satisfying vanishing Neumann conditions along $|x|=\varepsilon$, as $\varepsilon\downarrow 0$. Similarly for $s=1$: $U$ is then an $H^1$-limit of exterior solutions satisfying vanishing Dirichlet conditions along $|x|=\varepsilon$.
description: 16 pages
An exploratory study of a science curriculum in action : basic science in Fiji
Creators: name: Muralidhar, Srinivasiah
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the Reference field.
On the Mathematical Relationship between Expected n-call@k and the Relevance vs. Diversity Trade-off
Creators: name: Lim, Kar Wai
name: Sanner, Scott
name: Guo, Shengbo
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: It has been previously noted that optimization of the n-call@k relevance objective (i.e., a set-based objective that is 1 if at least n documents in a set of k are relevant, otherwise 0) encourages more result set diversification for smaller n, but this statement has never been formally quantified. In this work, we explicitly derive the mathematical relationship between expected n-call@k and the relevance vs. diversity trade-off --- through fortuitous cancellations in the resulting combinatorial optimization, we show the trade-off is a simple and intuitive function of n (notably independent of the result set size k e n), where diversification increases as n approaches 1.
description: SIGIR short paper
Überblickliste aller bisherigen und zukünftigen Coffee Lectures und Workshops, UB Hildesheim (Forschungsdatenmanagement), Stand: November 2019/20.
Creators: name: Strauch, Annette
Publisher: name: Zenodo
Year: 2020
Subjects: Schulungen
Workshops
Coffee Lectures
Veranstaltungen
Schulungen im FDM
Schulungen im Forschungsdatenmanagement
FDM in Niedersachsen
Forschungsdatenmanagement Niedersachsen
Digitalisierung Niedersachsen
Bibliotheken
Universitätsbibliotheken
Forschungsdatenmanagement Universitätsbibliothek
Digitale Kompetenzen
Forschungsdatenmanagement

description: Überblickliste aller bisherigen und zukünftigen Coffee Lectures und Workshops, UB Hildesheim (Forschungsdatenmanagement), Stand: November 2019/20.
Computing the partition function of the Sherrington-Kirkpatrick model is hard on average
Creators: name: Gamarnik, David
name: Kizildag, Eren
Publisher: name: arXiv
Year: 2018
Subjects: subject: Probability (math.PR)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Computational Complexity (cs.CC)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We establish the average-case hardness of the algorithmic problem of exact computation of the partition function associated with the Sherrington-Kirkpatrick model of spin glasses with Gaussian couplings and random external field. In particular, we establish that unless $P= \#P$, there does not exist a polynomial-time algorithm to exactly compute the partition function on average. This is done by showing that if there exists a polynomial time algorithm, which exactly computes the partition function for inverse polynomial fraction ($1/n^{O(1)}$) of all inputs, then there is a polynomial time algorithm, which exactly computes the partition function for all inputs, with high probability, yielding $P=\#P$. The computational model that we adopt is {\em finite-precision arithmetic}, where the algorithmic inputs are truncated first to a certain level $N$ of digital precision. The ingredients of our proof include the random and downward self-reducibility of the partition function with random external field; an argument of Cai et al. \cite{cai1999hardness} for establishing the average-case hardness of computing the permanent of a matrix; a list-decoding algorithm of Sudan \cite{sudan1996maximum}, for reconstructing polynomials intersecting a given list of numbers at sufficiently many points; and near-uniformity of the log-normal distribution, modulo a large prime $p$. To the best of our knowledge, our result is the first one establishing a provable hardness of a model arising in the field of spin glasses. Furthermore, we extend our result to the same problem under a different {\em real-valued} computational model, e.g. using a Blum-Shub-Smale machine \cite{blum1988theory} operating over real-valued inputs.
description: 31 pages
Regime transitions and energetics of sustained stratified shear flows
Creators: name: Lefauve, A.
name: Partridge, J. L.
name: Linden, P. F.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We describe the long-term dynamics of sustained stratified shear flows in the laboratory. The Stratified Inclined Duct (SID) experiment sets up a two-layer exchange flow in an inclined duct connecting two reservoirs containing salt solutions of different densities. This flow is primarily characterised by two non-dimensional parameters: the tilt angle of the duct with respect to the horizontal, $θ$ (a few degrees at most), and the Reynolds number $Re$, an input parameter based on the density difference driving the flow. The flow can be sustained with constant forcing over arbitrarily long times and exhibits a wealth of dynamical behaviours representative of geophysically-relevant sustained stratified shear flows. Varying $θ$ and $Re$ leads to four qualitatively different regimes: laminar flow; mostly laminar flow with finite-amplitude, travelling Holmboe waves; spatio-temporally intermittent turbulence with substantial interfacial mixing; and sustained, vigorous interfacial turbulence (Meyer & Linden, J. Fluid Mech., vol. 753, 2014, pp. 242-253). We seek to explain the scaling of the transitions between flow regimes in the two-dimensional plane of input parameters $(θ, Re)$. We improve upon previous studies of this problem by providing a firm physical basis and non-dimensional scaling laws that are mutually consistent and in good agreement with the empirical transition curves we inferred from 360 experiments spanning $θ\in [-1^\circ, 6^\circ]$ and $Re \in [300, 5000]$. To do so, we employ state-of-the-art simultaneous volumetric measurements of the density field and the three-component velocity field, and analyse these experimental data using time- and volume-averaged potential and kinetic energy budgets. We show that regime transitions are caused by ...
Letter from Michael Redington to John Betjeman, May 02, 1967
Creators: name: Redington, Michael
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Modernism (Literature)
valueUri: http://id.worldcat.org/fast/1024455
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Authors, English--Correspondence
valueUri: http://id.worldcat.org/fast/821953
subject: Television journalists
valueUri: http://id.worldcat.org/fast/1146949
subject: Betjeman, John, 1906-1984
valueUri: http://id.worldcat.org/fast/1427507
subject: Redington, Michael
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778

description: Correspondence between John Betjeman and Michael Redington. Redington thanks Betjeman for agreeing to do his programme. He tells Betjeman to discuss his options with producer, Margery Baker, and English journalist and broadcaster, Kenneth Robinson.
Geometric pluripotential theory on Kähler manifolds
Creators: name: Darvas, Tamás
Publisher: name: arXiv
Year: 2019
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Finite energy pluripotential theory accommodates the variational theory of equations of complex Monge-Ampère type arising in Kähler geometry. Recently it has been discovered that many of the potential spaces involved have a rich metric geometry, effectively turning the variational problems in question into problems of infinite dimensional convex optimization, yielding existence results for solutions of the underlying complex Monge-Ampère equations. The purpose of this survey is to describe these developments from basic principles.
description: v2. improved presentation
Dynamical Configurations of Celestial Systems Comprised of Multiple Irregular Bodies
Creators: name: Jiang, Yu
name: Zhang, Yun
name: Baoyin, Hexi
name: Li, Junfeng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: This manuscript considers the main features of the nonlinear dynamics of multiple irregular celestial body systems. The gravitational potential, static electric potential, and magnetic potential are considered. Based on the three established potentials, we show that three conservative values exist for this system, including a Jacobi integral. The equilibrium conditions for the system are derived and their stability analyzed. The equilibrium conditions of a celestial system comprised of n irregular bodies are reduced to 12n minus 9 equations. The dynamical results are applied to simulate the motion of multiple-asteroid systems. The simulation is useful for the study of the stability of multiple irregular celestial body systems and for the design of spacecraft orbits to triple asteroid systems discovered in the solar system. The dynamical configurations of the five triple-asteroid systems 45 Eugenia, 87 Sylvia, 93 Minerva, 216 Kleopatra, and 136617 1994CC, and the six-body system 134340 Pluto are calculated and analyzed.
description: 60 pages, 20 figures, The online version of this article (doi:10.1007/s10509-016-2884-z) contains supplementary material, which is available to authorized users. 6 videos, 5 rar files, 1 pdf file of figures
Letter from John Buchanan-Brown to John Betjeman, December 05, 1960
Creators: name: Buchanan-Brown, John
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Buchanan-Brown, John
subject: Authors, English--Correspondence
valueUri: http://id.worldcat.org/fast/821953
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Literature, Modern
valueUri: http://id.worldcat.org/fast/1000172
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Modernism (Literature)
valueUri: http://id.worldcat.org/fast/1024455
subject: Higgins, Brian, 1930-1965
valueUri: http://id.worldcat.org/fast/1991856
subject: Television journalists
valueUri: http://id.worldcat.org/fast/1146949
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Betjeman, John, 1906-1984
valueUri: http://id.worldcat.org/fast/1427507
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945

description: Correspondence between John Betjeman and John Buchanan-Brown. Buchanan-Brown thanks Betjeman for spending time helping Brian Higgins with his book.
The isometries of the space of Kähler metrics
Creators: name: Darvas, Tamás
Publisher: name: arXiv
Year: 2019
Subjects: subject: Differential Geometry (math.DG)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: Given a compact Kähler manifold, we prove that all global isometries of the space of Kähler metrics are induced by biholomorphisms and anti-biholomorphisms of the manifold. In particular, there exist no global symmetries for Mabuchi's metric. Moreover, we show that the Mabuchi completion does not even admit local symmetries. Closely related to these findings, we provide a large class of metric geodesic segments that can not be extended at one end, pointing out the first such examples in the literature.
Advanced Capsule Networks via Context Awareness
Creators: name: Phong, Nguyen Huu
name: Ribeiro, Bernardete
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Capsule Networks (CN) offer new architectures for Deep Learning (DL) community. Though its effectiveness has been demonstrated in MNIST and smallNORB datasets, the networks still face challenges in other datasets for images with distinct contexts. In this research, we improve the design of CN (Vector version) namely we expand more Pooling layers to filter image backgrounds and increase Reconstruction layers to make better image restoration. Additionally, we perform experiments to compare accuracy and speed of CN versus DL models. In DL models, we utilize Inception V3 and DenseNet V201 for powerful computers besides NASNet, MobileNet V1 and MobileNet V2 for small and embedded devices. We evaluate our models on a fingerspelling alphabet dataset from American Sign Language (ASL). The results show that CNs perform comparably to DL models while dramatically reducing training time. We also make a demonstration and give a link for the purpose of illustration.
description: 12 pages
Probing dark matter particles at CEPC
Creators: name: Liu, Zuowei
name: Xu, Yong-Heng
name: Zhang, Yu
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We investigate the capability of the future electron collider CEPC in probing the parameter space of several dark matter models, including millicharged dark matter models, $Z'$ portal dark matter models, and effective field theory dark matter models. In our analysis, the monophoton final state is used as the primary channel to detect dark matter models at CEPC. To maximize the signal to background significance, we study the energy and angular distributions of the monophoton channel arising from dark matter models and from the standard model to design a set of detector cuts. For the $Z'$ portal dark matter, we also analyze the $Z'$ boson visible decay channel which is found to be complementary to the monophoton channel in certain parameter space. The CEPC reach in the parameter space of dark matter models is also put in comparison with Xenon1T. We find that CEPC has the unprecedented sensitivity to certain parameter space for the dark matter models considered; for example, CEPC can improve the limits on millicharge by one order of magnitude than previous collider experiments for ${\cal O}(1)-100$ GeV dark matter.
description: v1: 21 pages, 31 figures; v2: journal version
Kalman-Takens filtering in the presence of dynamical noise
Creators: name: Hamilton, Franz
name: Berry, Tyrus
name: Sauer, Timothy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Methodology (stat.ME)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The use of data assimilation for the merging of observed data with dynamical models is becoming standard in modern physics. If a parametric model is known, methods such as Kalman filtering have been developed for this purpose. If no model is known, a hybrid Kalman-Takens method has been recently introduced, in order to exploit the advantages of optimal filtering in a nonparametric setting. This procedure replaces the parametric model with dynamics reconstructed from delay coordinates, while using the Kalman update formulation to assimilate new observations. We find that this hybrid approach results in comparable efficiency to parametric methods in identifying underlying dynamics, even in the presence of dynamical noise. By combining the Kalman-Takens method with an adaptive filtering procedure we are able to estimate the statistics of the observational and dynamical noise. This solves a long standing problem of separating dynamical and observational noise in time series data, which is especially challenging when no dynamical model is specified.
The Lutheran congregational schools of Victoria 1854-1930 : a history
Creators: name: Meyer, Charles
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the Reference field.
SCALABLE AND SUSTAINABLE LONG TERM DIGITAL PRESERVATION OF SCIENTIFIC DATASETS
Creators: name: Addis, Matthew
Publisher: name: figshare
Year: 2022
Subjects: subject: 80309 Software Engineering
subject: FOS: Computer and information sciences
subject: Information Systems

description: Paper presented at the iPRES 2021 conference, Beijing, China, 19-22 Oct. 2021.
 The European Commission supported ARCHIVER project (Archiving and Preservation for Research Environments) aims to “introduce significant improvements in the area of archiving and digital preservation services, supporting the IT requirements of European scientists and providing end-to-end archival and preservation services, cost-effective for data generated in the petabyte range with high, sustained ingest rates, in the context of scientific research projects”. This paper presents a software solution developed by Arkivum to meet the needs of long-term digital preservation of scientific datasets in ARCHIVER. We present and discuss how this solution is scalable (able to process and store very large volumes of research data) and sustainable (both economically and environmentally). This is achieved through a combination of serverless computing, deployment on hyperscale infrastructure, and implementation of configurable ‘Minimum Effort Ingest’ workflows. In particular, we show how high-performance and scalable Long Term Digital Preservation (LTDP) of very- large datasets can be done in a way that is entirely compatible with high levels of cost-efficiency and minimized environmental impact.
Limit on Lorentz-Invariance- and CPT-Violating Neutron Spin Interactions Using a $^3$He-$^{129}$Xe Comagnetometer
Creators: name: Allmendinger, Fabian
name: Schmidt, Ulrich
name: Heil, Werner
name: Karpuk, Sergej
name: Sobolev, Yuri
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We performed a search for a Lorentz-invariance- and CPT-violating coupling of the $^3$He and $^{129}$Xe nuclear spins to posited background fields. Our experimental approach is to measure the free precession of nuclear spin polarized $^3$He and $^{129}$Xe atoms using SQUID detectors. As the laboratory reference frame rotates with respect to distant stars, we look for a sidereal modulation of the Larmor frequencies of the co-located spin samples. As a result we obtain an upper limit on the equatorial component of the background field $\tilde{b}^n_{\bot}< 8.4 \cdot 10^{-34}$ GeV (68\% C.L.). Furthermore, this technique was modified to search for an electric dipole moment (EDM) of $^{129}$Xe.
description: Presented at the Seventh Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 20-24, 2016
Geometry of Spinning Ellis Wormholes
Creators: name: Chew, Xiao Yan
name: Kleihaus, Burkhard
name: Kunz, Jutta
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We give a detailed account of the properties of spinning Ellis wormholes, supported by a phantom field. The general set of solutions depends on three parameters, associated with the size of the throat, the rotation and the symmetry of the solutions. For symmetric wormholes the global charges possess the same values in both asymptotic regions, while this is no longer the case for non-symmetric wormholes. We present mass formulae for these wormholes, study their quadrupole moments, and discuss the geometry of their throat and their ergoregion. We demonstrate, that these wormholes possess limiting configurations corresponding to an extremal Kerr black hole. Moreover, we analyze the geodesics of these wormholes, and show that they possess bound orbits.
description: 24 pages, 17 figures