cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gap probability for products of random matrices in the critical regime
Creators: name: Berezin, Sergey
name: Strahov, Eugene
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: The singular values of a product of $M$ independent Ginibre matrices of size $N\times N$ form a determinantal point process. Near the soft edge, as both $M$ and $N$ go to infinity in such a way that $M/N\to α$, $α>0$, a scaling limit emerges. We consider a gap probability for the corresponding limiting determinantal process, namely, the probability that there are no particles in the interval $(a,+\infty)$. We derive a Tracy-Widom-like formula in terms of the unique solution of a certain matrix Riemann-Hilbert problem of size $2 \times 2$. The right-tail asymptotics for this solution is obtained by the Deift-Zhou non-linear steepest descent analysis.
description: 28 pages, 4 figures
On some new congruences for binomial coefficients
Creators: name: Sun, Zhi-Wei
name: Tauraso, Roberto
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 11B65, 05A10, 11A07

description: In this paper we establish some new congruences involving central binomial coefficients as well as Catalan numbers. Let $p$ be a prime and let $a$ be any positive integer. We determine $\sum_{k=0}^{p^a-1}\binom{2k}{k+d}$ mod $p^2$ for $d=0,...,p^a$ and $\sum_{k=0}^{p^a-1}\binom{2k}{k+δ}$ mod $p^3$ for $δ=0,1$. We also show that $$C_n^{-1}\sum_{k=0}^{p^a-1}C_{p^an+k}=1-3(n+1)((p^a-1)/3) (mod p^2)$$ for every n=0,1,2,..., where $C_m$ is the Catalan number $\binom{2m}{m}/(m+1)$, and (-) is the Legendre symbol.
Towards the measurement of surfaces on a large scale: synthetic aperture interferometry
Creators: name: Park, Ian
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 91399 Mechanical Engineering not elsewhere classified
subject: FOS: Mechanical engineering

description: Synthetic aperture interferometry has been used in radar for many years, however, it is only recently that technological advancements have allowed this technique to be applied at optical wavelengths. One application for synthetic aperture interferometry is in the field of surface metrology, where optical methods have been used to increase the area and speed of surface measurement when comparted to traditional contacting techniques. With the ability to synthesise large apertures, the area, speed, and resolution of these optical measurements could be further improved.In this thesis, a proposal for a novel optical instrument is presented. This instrument was based around synthetic aperture interferometry and was designed to measure surfaces over a large area and to an axial and lateral resolution comparable to a commercial coherence scanning interferometer. The size of the measurement area and the estimated speed of measurement for this device would allow for large high value manufactured parts to be measured in real time. Within this thesis, the performance of the proposed optical system was predicted using linear systems theory. This analysis looked at different illumination arrangements for the system and the effects they had on the point spread function of the instrument. Additionally, this investigation showed an important factor for the novel optical instrument was the close packing of coherent imagers; used to capture light scattered from the surface. This led to the design of a compact coherent imager (compact holographic imager) that was used to measure the phase and amplitude of light scattered from a surface. The design of this imager involved the use of a bespoke reference beam illumination, which required a new method for the calibration of the coherent imagers’ reference beam. The light measured by a coherent imager that has been scattered from a surface contains information about the surface and can be used to synthesise an aperture. This combining of information was achieved with the knowledge of the illumination conditions and positions of the imagers when the measurement was taken. To correctly combine this data a two-step calibration method for the proposed optical system was developed, allowing for the reconstruction of the measured surface to be performed. The thesis concludes with experimental results demonstrating synthetic aperture interferometry, the various calibration techniques and the compact coherent imager.This thesis was able to demonstrate the feasibility of a synthetic aperture interferometric system that is capable of measuring surfaces over a large area to a high axial and lateral resolution.
Magnetotransport properties of strained (Ga0.95, Mn0.05)As epilayers close to the metal-insulator transition: Description using Aronov-Altshuler three-dimensional scaling theory
Creators: name: Honolka, J.
name: Masmanidis, S.
name: Tang, H. X.
name: Awschalom, D. D.
name: Roukes, M. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The magnitude of the anisotropic magnetoresistance (AMR) and the longitudinal resistance in compressively strained (Ga0.95, Mn0.05)As epilayers were measured for the first time down to temperatures as low as 30 mK. Below temperatures of 3K the conductivity decreases ~ T^1/3 over two orders of magnitude in temperature. The conductivity can be well described within the framework of a 3D scaling theory of Anderson's transition in the presence of spin scattering in semiconductors. It is shown that the samples are on the metallic side but very close to the metal-insulator transition (MIT). At lowest temperatures a decrease in the AMR effect is observed, which is assigned to changes in the coupling between the remaining itinerant carriers and the local Mn 5/2-spin moments.
description: 6 pages, 6 figures
Neural Computation of Capacity Region of Memoryless Multiple Access Channels
Creators: name: Mirkarimi, Farhad
name: Farsad, Nariman
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper provides a numerical framework for computing the achievable rate region of memoryless multiple access channel (MAC) with a continuous alphabet from data. In particular, we use recent results on variational lower bounds on mutual information and KL-divergence to compute the boundaries of the rate region of MAC using a set of functions parameterized by neural networks. Our method relies on a variational lower bound on KL-divergence and an upper bound on KL-divergence based on the f-divergence inequalities. Unlike previous work, which computes an estimate on mutual information, which is neither a lower nor an upper bound, our method estimates a lower bound on mutual information. Our numerical results show that the proposed method provides tighter estimates compared to the MINE-based estimator at large SNRs while being computationally more efficient. Finally, we apply the proposed method to the optical intensity MAC and obtain a new achievable rate boundary tighter than prior works.
description: 6 pages, 4 figures, accepted at ISIT2021
Mallomonas kicherica Bessudova & Firsova & Tomberg & Bayramova & Hilkhanova & Bedoshvili & Bashenkhaeva & Zakharova & Likhoshway 2023, sp. nov.
Creators: name: Bessudova, Anna
name: Firsova, Alena D.
name: Tomberg, Irina V.
name: Bayramova, Elvira
name: Hilkhanova, Diana
name: Bedoshvili, Yekaterina D.
name: Bashenkhaeva, Maria
name: Zakharova, Lyubov I. Kopyrina Yulia R.
name: Likhoshway, Yelena V.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Chromista
Ochrophyta
Chrysophyceae
Synurales
Mallomonadaceae
Mallomonas
Mallomonas kicherica

description: Mallomonas kicherica sp. nov. Bessudova (Figs. 2–4).
Description: Scales are 3.4–4.5 × 1.8–2.4 μm, oval with lateral incurvings. The dome is subcircular with labyrinth-like reticulation. Small ribs extending to the first transverse rib extend from the dome towards the shield. The shield is patterned with of 8–11 regularly spaced transverse ribs. The transverse ribs, except for the area between the first and second (closest to the dome), are connected in random order by short ribs-jumpers (Figs. 2–4). The anterior flanges with 8–11 closely spaced struts on each side (Figs. 2–4). The anterior submarginal ribs are well-developed. The V-rib on the scales is acutely angled, hooded. The posterior rim is wide and smooth. The posterior flange contains approximately 20–23 struts (Figs. 2–4). Bristles are 6.5–9.2 μm in length, slightly curved (Fig. 2). The tip of the bristle is bifurcated with unequal diverging branches. One branch is short and sharp, whereas the other is wide with an acute tip and flat dorsal side. Cysts were not observed.
Holotype (here designated): Portion of a single gathering of cells on SEM stub No. 18422 deposited at the herbarium of the Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Irkutsk (LIN). Material from the Angara-Kichera estuary, a tributary of the northern part of Lake Baikal, was collected in June 2022. Figures 2–4 illustrates the characteristic scales from the holotype.
Type locality: Mouth of the Kichera River, a tributary of the northern part of Lake Baikal, Republic of Buryatia, Russia. Latitude/Longitude: 55°43′55′′N, 109°32′24′′E.
Etymology: The new species name is derived from the type locality, the Kichera River.
Distribution: Up-to-date, M. kicherica has been only observed in its type locality. At the time of collection, pH = 8.04, T = 16.9°C, and EC = 112 μS̛ сm−1 (see Table 1).
description: Published as part of Bessudova, Anna, Firsova, Alena D., Tomberg, Irina V., Bayramova, Elvira, Hilkhanova, Diana, Bedoshvili, Yekaterina D., Bashenkhaeva, Maria, Zakharova, Lyubov I. Kopyrina Yulia R. & Likhoshway, Yelena V., 2023, Two new species of silica-scaled chrysophytes (Chrysophyceae, Synurales) Mallomonas kicherica and M. sibirica water bodies of Eastern Siberia, Russia, pp. 59-69 in Phytotaxa 620 (1) on pages 62-63, DOI: 10.11646/phytotaxa.620.1.5, http://zenodo.org/record/10015521
Rotating spherical particle in a continuous viscoelastic medium -- a microrheological example situation
Creators: name: Richter, S. K.
name: Deters, C. D.
name: Menzel, A. M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Using analytical calculations, we characterize the rotational behavior of a rigid spherical particle when subject to a net external torque in a continuous viscoelastic environment. On long time scales, the embedding medium can either feature a net terminal flow, like a fluid, or damped reversible dynamics, like an elastic solid. The coupling of the sphere to its environment together with the therein induced deformations and flows are taken into account explicitly. In reality, using magnetically anisotropic particles, the torque can, for instance, be applied via magnetic fields. We calculate corresponding response functions. This connects our study to evaluations of microrheological investigations.
Gradings on the Kac superalgebra
Creators: name: Jesus, Antonio
name: Martin, Calderon
name: Draper, Cristina
name: Candido, Fontanals
name: Gonzalez, Martin
Publisher: name: arXiv
Year: 2008
Subjects: subject: Rings and Algebras (math.RA)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 17C70, 17C40

description: We classify the gradings on the Kac superalgebra up to equivalence.
description: 13 pages
beta_SM_project
Creators: name: Varela Correa, Lucas
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 490499
subject: Pure mathematics not elsewhere classified

description: There are a lot of functions that are integrals with no solution, infinite series or problems with "solutions" that are just conventions to don't t think more about it.In this project will resolve all that problems that have the math
Coarse Grained Modeling of The Interface Between Water and Heterogeneous Surfaces
Creators: name: Willard, Adam P.
name: Chandler, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using coarse grained models we investigate the behavior of water adjacent to an extended hydrophobic surface peppered with various fractions of hydrophilic patches of different sizes. We study the spatial dependence of the mean interface height, the solvent density fluctuations related to drying the patchy substrate, and the spatial dependence of interfacial fluctuations. We find that adding small uniform attractive interactions between the substrate and solvent cause the mean position of the interface to be very close to the substrate. Nevertheless, the interfacial fluctuations are large and spatially heterogeneous in response to the underlying patchy substrate. We discuss the implications of these findings to the assembly of heterogeneous surfaces.
description: 17 pages, 6 figures
Sensitivity of the spherical gravitational wave detector MiniGRAIL operating at 5 K
Creators: name: Gottardi, L.
name: de Waard, A.
name: Usenko, A.
name: Frossati, G.
name: Podt, M.
name: Flokstra, J.
name: Bassan, M.
name: Fafone, V.
name: Minenkov, Y.
name: Rocchi, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present the performances and the strain sensitivity of the first spherical gravitational wave detector equipped with a capacitive transducer and read out by a low noise two-stage SQUID amplifier and operated at a temperature of 5 K. We characterized the detector performance in terms of thermal and electrical noise in the system output sygnal. We measured a peak strain sensitivity of $1.5\cdot 10^{-20} Hz^{-1/2}$ at 2942.9 Hz. A strain sensitivity of better than $5\cdot 10{-20}Hz{-1/2}$ has been obtained over a bandwidth of 30 Hz. We expect an improvement of more than one order of magnitude when the detector will operate at 50 mK. Our results represent the first step towards the development of an ultracryogenic omnidirectional detector sensitive to gravitational radiation in the 3kHz range.
description: 8 pages, 5 figures, submitted to Physical Review D
Economics of energy conservation in commercial greenhouses : microcomputer spreadsheet model
Creators: name: Shell, Barry
Publisher: name: University of British Columbia
Year: 2010

description: Microcomputer software for capital cost analysis in greenhouse energy management is developed for use by extention workers in agriculture. A "template" for proprietary "spreadsheet" software is created that models greenhouse operation and performs a Net Present Value analysis of the cash flow for the life of up to ten energy saving techniques chosen by the grower. The results are displayed on the screen or printed out. Variables can be altered to suit specific user's needs and to check sensitivity of the model. A survey of local greenhouse growers was done to determine the specifications for the software developed and to verify the accuracy of the model. The resulting program is designed to run under MS-DOS on the IBM personal computer or any other similar microcomputer.
Theories on stress / Teorie sullo stress
Creators: name: Bottaccioli, Francesco
name: Rulli, Giovanni
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2014
Subjects: M-FIL/02 Logica e filosofia della scienza
M-PSI/01 Psicologia generale
M-PSI/06 Psicologia del lavoro e delle organizzazioni
MED/44 Medicina del lavoro
SECS-P/10 Organizzazione aziendale

description: Two theories on stress are introduced. The first one proposes the unification of the two great research traditions on stress, biological and psychological, within a systemic science, psychoneuroendocrineimmunologic, aimed at both explaining the complex interaction between different levels of stress incidence on health and disease, and integrating the care of the others and the care of oneself.  The other theory, oriented towards the study and the improvement of human being's condition, especially well-being at work, criticizes the psychological interpretative perspectives. According to this theory, stress is conceived as a psychoneuroendocrineimmune process, while health and prevention are seen as perfectible processes. Several differences, compatible elements as well as synergies between the two theories emerge.
Dielectric Screening in a Spherical Cavity
Creators: name: Glosser, Christopher J
name: Hill, Roger C
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: Biological Physics (physics.bio-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In this work we examine the electrostatic screening potential due to a point charge located off-centre in a spherical dielectric cavity. This potential is expanded for the case in which the dielectric constant $ε$ is large, several methods of finding the terms in the expansion are investigated, and closed-form expressions are found through third order in $ε$ along with error bounds. Finally, possible uses of these expressions in molecular dynamics simulations of isolated charged molecules is discussed.
description: 15 Pages, 5 Figures, To be submitted to J. Phys. A. Uses iopart.cls
Simplicial contagion in temporal higher-order networks
Creators: name: Chowdhary, Sandeep
name: Kumar, Aanjaneya
name: Cencetti, Giulia
name: Iacopini, Iacopo
name: Battiston, Federico
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Complex networks represent the natural backbone to study epidemic processes in populations of interacting individuals. Such a modeling framework, however, is naturally limited to pairwise interactions, making it less suitable to properly describe social contagion, where individuals acquire new norms or ideas after simultaneous exposure to multiple sources of infections. Simplicial contagion has been proposed as an alternative framework where simplices are used to encode group interactions of any order. The presence of higher-order interactions leads to explosive epidemic transitions and bistability which cannot be obtained when only dyadic ties are considered. In particular, critical mass effects can emerge even for infectivity values below the standard pairwise epidemic threshold, where the size of the initial seed of infectious nodes determines whether the system would eventually fall in the endemic or the healthy state. Here we extend simplicial contagion to time-varying networks, where pairwise and higher-order simplices can be created or destroyed over time. By following a microscopic Markov chain approach, we find that the same seed of infectious nodes might or might not lead to an endemic stationary state, depending on the temporal properties of the underlying network structure, and show that persistent temporal interactions anticipate the onset of the endemic state in finite-size systems. We characterize this behavior on higher-order networks with a prescribed temporal correlation between consecutive interactions and on heterogeneous simplicial complexes, showing that temporality again limits the effect of higher-order spreading, but in a less pronounced way than for homogeneous structures. Our work suggests the importance of incorporating temporality, a realistic feature of many real-world systems, into the investigation of dynamical processes beyond pairwise interactions.
description: 9 pages, 5 figures
Target atmospheric CO2: Supporting material
Creators: name: Hansen, J.
name: Sato, M.
name: Kharecha, P.
name: Beerling, D.
name: Berner, R.
name: Masson-Delmotte, V.
name: Pagani, M.
name: Raymo, M.
name: Royer, D. L.
name: Zachos, J. C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Additional material supporting the article "Target atmospheric CO2: Where should humanity aim?"
description: 27 pages, 21 figures; final version accepted by Open Science Atmospheric Journal; main article separately submitted to arXiv as "Target atmospheric CO2: Where should humanity aim?", arxiv:0804.1126
Electron-proton co-acceleration on relativistic shocks in extreme-TeV blazars
Creators: name: Zech, Andreas
name: Lemoine, Martin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The multi-wavelength emission from a newly identified population of `extreme-TeV' blazars, with Compton peak frequencies around 1 TeV, is difficult to interpret with standard one-zone emission models. Large values of the minimum electron Lorentz factor and quite low magnetisation values seem to be required. We propose a scenario where protons and electrons are co-accelerated on internal or recollimation shocks inside the relativistic jet. In this situation, energy is transferred from the protons to the electrons in the shock transition layer, leading naturally to a high minimum Lorentz factor for the latter. A low magnetisation favours the acceleration of particles in relativistic shocks. The shock co-acceleration scenario provides additional constraints on the set of parameters of a standard one-zone lepto-hadronic emission model, reducing its degeneracy. Values of the magnetic field strength of a few mG and minimum electron Lorentz factors of 10^3 to 10^4, required to provide a satisfactory description of the observed spectral energy distributions of extreme blazars, result here from first principles. While acceleration on a single standing shock is sufficient to reproduce the emission of most of the extreme-TeV sources we have examined, re-acceleration on a second shock appears needed for those objects with the hardest gamma-ray spectra. Emission from the accelerated proton population, with the same number density as the electrons but in a lower range of Lorentz factors, is strongly suppressed. Satisfactory self-consistent representations were found for the most prominent representatives of this new blazar class.
description: 18 pages, 15 figures; accepted for publication in A&A
An Energy Efficiency Perspective on Training for Fading Channels
Creators: name: Gursoy, Mustafa Cenk
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, the bit energy requirements of training-based transmission over block Rayleigh fading channels are studied. Pilot signals are employed to obtain the minimum mean-square-error (MMSE) estimate of the channel fading coefficients. Energy efficiency is analyzed in the worst case scenario where the channel estimate is assumed to be perfect and the error in the estimate is considered as another source of additive Gaussian noise. It is shown that bit energy requirement grows without bound as the snr goes to zero, and the minimum bit energy is achieved at a nonzero snr value below which one should not operate. The effect of the block length on both the minimum bit energy and the snr value at which the minimum is achieved is investigated. Flash training schemes are analyzed and shown to improve the energy efficiency in the low-snr regime. Energy efficiency analysis is also carried out when peak power constraints are imposed on pilot signals.
description: To appear in the Proc. of the 2007 IEEE International Symposium on Information Theory
Belief-Propagation for Weighted b-Matchings on Arbitrary Graphs and its Relation to Linear Programs with Integer Solutions
Creators: name: Bayati, Mohsen
name: Borgs, Christian
name: Chayes, Jennifer
name: Zecchina, Riccardo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: We consider the general problem of finding the minimum weight $\bm$-matching on arbitrary graphs. We prove that, whenever the linear programming (LP) relaxation of the problem has no fractional solutions, then the belief propagation (BP) algorithm converges to the correct solution. We also show that when the LP relaxation has a fractional solution then the BP algorithm can be used to solve the LP relaxation. Our proof is based on the notion of graph covers and extends the analysis of (Bayati-Shah-Sharma 2005 and Huang-Jebara 2007}. These results are notable in the following regards: (1) It is one of a very small number of proofs showing correctness of BP without any constraint on the graph structure. (2) Variants of the proof work for both synchronous and asynchronous BP; it is the first proof of convergence and correctness of an asynchronous BP algorithm for a combinatorial optimization problem.
description: 28 pages, 2 figures. Submitted to SIAM journal on Discrete Mathematics on March 19, 2009; accepted for publication (in revised form) August 30, 2010; published electronically July 1, 2011
Update on $|V_{us}|$ and $|V_{us}/V_{ud}|$ from semileptonic kaon and pion decays
Creators: name: Seng, Chien-Yeah
name: Galviz, Daniel
name: Marciano, William J.
name: Meißner, Ulf-G.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We discuss the recent progress in the study of semileptonic kaon and pion decays, including new experimental results, improved electroweak radiative corrections, form factor calculations and isospin-breaking effects. As a result, we obtain $|V_{us}|=0.22309(40)(39)(3)$ from kaon semileptonic decays and $|V_{us}/V_{ud}|=0.22908(66)(41)(40)(2)(1)$ from the ratio between the kaon and pion semileptonic decay rates. We report an apparent violation of the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity at a $3.2\sim 5.6σ$ level, and a discrepancy at a $2.2σ$ level between the value of $|V_{us}/V_{ud}|$ determined from the vector and axial charged weak interactions. Prospects for future improvements in those comparative precision tests involving $|V_{ud}|$, $|V_{us}|$ and their implications for physics beyond the Standard Model are described.
description: Version accepted by PRD. A figure is added, and a previous mistake in the discussion of the PIONEER precision goal is corrected
Support de cours "Trouver et exploiter un brevet, une marque, un label"
Creators: name: Latour, Marie
Publisher: name: Zenodo
Year: 2019
Subjects: Doctorat
Pluridisciplaire
Marque
Label
Brevet

description: Vous trouverez ici mon support de cours utilisé dans le cadre de mes formations à l'Information scientifique et technique à destination des doctorants sur les brevets, marques et labels.
Magneto-conductance Oscillations in Graphene Antidot Arrays
Creators: name: Shen, T.
name: Wu, Y. Q.
name: Capano, M. A.
name: Rokhinson, L. R.
name: Engel, L. W.
name: Ye, P. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Epitaxial graphene films have been formed on the C-face of semi-insulating 4H-SiC substrates by a high temperature sublimation process. Nano-scale square antidot arrays have been fabricated on these graphene films. At low temperatures, magneto-conductance in these films exhibits pronounced Aharonov-Bohm oscillations with the period corresponding to magnetic flux quanta added to the area of a single antidot. At low fields, weak localization is observed and its visibility is enhanced by intravalley scattering on antidot edges. At high fields, we observe two distinctive minima in magnetoconductance which can be attributed to commensurability oscillations between classical cyclotron orbits and antidot array. All mesoscopic features, surviving up to 70 K, reveal the unique electronic properties of graphene.
description: 5 pages, 3 figures
D4.8 Pilot IV: First Report
Creators: name: Allgaier, Katharina
name: Veríssimo, Susana
name: Orlikowski, Matthias
name: Hartung, Mattias
Publisher: name: Zenodo
Year: 2020

description: Semalytix provides solutions to customers in the pharmaceutical industry in order to foster patient centricity in medical drug development through text analytics on real-world data. According to the FDA, patient-centric drug development is “a systematic approach to help ensure that patients’ experiences, perspectives, needs, and priorities are captured and meaningfully incorporated into drug development and evaluation. As experts in what it is like to live with their condition, patients are uniquely positioned to inform the understanding of the therapeutic context for drug development and evaluation”. Crucially, the aforementioned definition refers to real-world patient experience (“what it is like to live with their condition”) rather than clinical outcomes that are regularly measured and evaluated under laboratory conditions in clinical trials. Real-world insights of this kind, comprising self-reported disease burdens,
 treatment experience and unmet needs of particular patient populations, are increasingly gaining importance in regulatory approval and value assessment procedures of new drug products. Semalytix provides access to these insights via their Pharos Pharma Analytics platform, based on text analytics from large volumes of patient-reported narratives that are gathered in social media. As an additional source of evidence, health outcomes reported through
 medical experts are used to complement the patients’ perspective.
Far-infrared absorption by liquid nitrogen and liquid oxygen
Creators: name: Wishnow, Edward Hyman
Publisher: name: University of British Columbia
Year: 2010

description: This thesis examines the collision induced, far-infrared absorption of homonuclear diatomic molecules. These molecular processes are relevant in the astrophysical environments of planetary atmospheres and galactic molecular clouds, and a brief survey of far-infrared measurements of these regions is presented. The theory of collision induced absorption by molecular rotational transitions is reviewed and a calculation is made of the quadrupolar induced, single rotational transition absorption line intensities of the nitrogen and oxygen molecules. The far-infrared absorption spectra of liquid nitrogen and liquid oxygen at 77K, over the frequency range 5 to 70 cm⁻¹ , have been measured. The far-infrared spectrum of liquid oxygen has not previously been reported. The present work includes the design of a low temperature, multiple pass, far-infrared absorption cell intended for low temperature, low density gas measurements. The effect of diffraction on the cell's maximum attainable optical path length, and a model used to estimate the anticipated liquid helium consumption are discussed.
Fault-tolerant quantum computation with static linear optics
Creators: name: Tzitrin, Ilan
name: Matsuura, Takaya
name: Alexander, Rafael N.
name: Dauphinais, Guillaume
name: Bourassa, J. Eli
name: Sabapathy, Krishna K.
name: Menicucci, Nicolas C.
name: Dhand, Ish
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The scalability of photonic implementations of fault-tolerant quantum computing based on Gottesman-Kitaev-Preskill (GKP) qubits is injured by the requirements of inline squeezing and reconfigurability of the linear optical network. In this work we propose a topologically error-corrected architecture that does away with these elements at no cost - in fact, at an advantage - to state preparation overheads. Our computer consists of three modules: a 2D array of probabilistic sources of GKP states; a depth-four circuit of static beamsplitters, phase shifters, and single-time-step delay lines; and a 2D array of homodyne detectors. The symmetry of our proposed circuit allows us to combine the effects of finite squeezing and uniform photon loss within the noise model, resulting in more comprehensive threshold estimates. These jumps over both architectural and analytical hurdles considerably expedite the construction of a photonic quantum computer.
description: 15 pages, 6 figures, comments welcome; minor typos corrected and Fig. 2 updated to resolve rendering issues on some platforms
Ikonografija i telo: prikaz pola na antropomorfnim figurinama sa lokaliteta Vinča-Belo brdo
Creators: name: Tripković, Ana
name: Radinović, Mihailo
name: Porčić, Marko
name: Stefanović, Sofija
Publisher: name: Zenodo
Year: 2019
Subjects: anthropomorphic figurines
iconography
sex
Vinča-Belo brdo

description: Sa lokaliteta Vinča-Belo brdo potiče više od hiljadu primeraka antropomorfne plastike koje su bile predmet više različitih analiza. U ovom radu ispitujemo zastupljenost polnih karakteristika na vinčanskim figurinama i njihov odnos sa drugim telesnim odlikama. Opservacija pola na statuetama i ponekad iz njega izvedene ideje o prepoznavanju roda poslednjih godina izazvale su disonantna mišljenja o opravdanosti ovog metodološkog pristupa. Cilj našeg rada je nastavak diskusije o korisnosti istraživanja ikonografske elaboracije antropomorfnih figurina kao analitičkog puta za razumevanje prikaza pola na predmetima ove vrste. Istraživački uzorak čini 875 fragmentovanih i celih figurina sa lokaliteta Vinča-Belo Brdo, iz fonda Arheološke zbirke Filozofskog fakulteta u Beogradu. Prisustvo ili odsustvo polnih obeležja biće prikazani u odnosu na druge formalne karakteristike poput stepena složenosti izrade, položaja tela (dinamike pokreta), položaja gornjih i donjih ekstremiteta, kao i prikaza nakita i odeće. Na kraju, izložićemo i razmotriti zastupljenost određenih asocijativnih obrazaca u našem uzorku i njihovu potencijalnu vrednost za dalja istraživanja ikonografije vinčanskih figurina.
Quasi-stable Localized Excitations in the β-Fermi Pasta Ulam Tsingou System
Creators: name: Fuller, Nathaniel J.
name: Sen, Surajit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: The lifetimes of localized nonlinear modes in both the $β$-Fermi-Pasta-Ulam-Tsingou ($β$-FPUT) chain and a cubic $β$-FPUT lattice are studied as functions of perturbation amplitude, and by extension, the relative strength of the nonlinear interactions compared to the linear part. We first recover the well known result that localized nonlinear excitations (LNEs) produced by a bond squeeze can be reduced to an approximate two-frequency solution and then show that the nonlinear term in the potential can lead to the production of secondary frequencies within the phonon band. This can affect the stability and lifetime of the LNE by facilitating interactions between the LNE and a low energy acoustic background which can be regarded as "noise" in the system. In the one dimensional FPUT chain, the LNE is stabilized by low energy acoustic emissions at early times; in some cases allowing for lifetimes several orders of magnitude larger than the oscillation period. The longest lived LNEs are found to satisfy the parameter dependence $\mathcal{A}\sqrtβ\approx1.1$ where $β$ is the relative nonlinear strength and $\mathcal{A}$ is the displacement amplitude of the center particles in the LNE. In the cubic FPUT lattice, the LNE lifetime $T$ decreases rapidly with increasing amplitude $\mathcal{A}$ and is well described by the double log relationship $\log_{10}\log_{10}(T)\approx -(0.15\pm0.01)\mathcal{A}\sqrtβ+(0.62\pm0.02)$.
Quantum ergodicity and entanglement in kicked coupled-tops
Creators: name: Trail, C.
name: Madhok, V.
name: Deutsch, I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the dynamical generation of entanglement as a signature of chaos in a system of periodically kicked coupled-tops, where chaos and entanglement arise from the same physical mechanism. The long-time averaged entanglement as a function of the position of an initially localized wave packet very closely correlates with the classical phase space surface of section -- it is nearly uniform in the chaotic sea, and reproduces the detailed structure of the regular islands. The uniform value in the chaotic sea is explained by the random state conjecture. As classically chaotic dynamics take localized distributions in phase space to random distributions, quantized versions take localized coherent states to pseudo-random states in Hilbert space. Such random states are highly entangled, with an average value near that of the maximally entangled state. For a map with global chaos, we derive that value based on new analytic results for the typical entanglement in a subspace defined by the symmetries of the system. For a mixed phase space, we use the Percival conjecture to identify a "chaotic subspace" of the Hilbert space. The typical entanglement, averaged over the unitarily invariant Haar measure in this subspace, agrees with the long-time averaged entanglement for initial states in the chaotic sea. In all cases the dynamically generated entanglement is predicted by a unitary ensemble of random states, even though the system is time-reversal invariant, and the Floquet operator is a member of the circular orthogonal ensemble.
description: 12 pages with 8 figures
Small Sample Limit of the Bennett Acceptance Ratio Method and the Variationally Derived Intermediates
Creators: name: Reinhardt, Martin
name: Grubmüller, Helmut
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Free energy calculations based on atomistic Hamiltonians provide microscopic insight into the thermodynamic driving forces of biophysical or condensed matter systems. Many approaches use intermediate Hamiltonians interpolating between the two states for which the free energy difference is calculated. The Bennett Acceptance Ratio (BAR) and Variationally Derived Intermediates (VI) methods are optimal estimator and intermediate states in that the mean-squared error of free energy calculations based on independent sampling is minimized. However, BAR and VI have been derived based on several approximations that do not hold for very few sample points. Analyzing one-dimensional test systems we show that in such cases BAR and VI are suboptimal and that established uncertainty estimates are inaccurate. Whereas for VI to become optimal less than seven samples per state suffice in all cases, for BAR the required number increases unboundedly with decreasing configuration space densities overlap of the end states. We show that for BAR the required number of samples is related to the overlap through an inverse power law. Because this relation seems to hold universally and almost independent of other system properties, these findings can guide the proper choice of estimator for free energy calculations.
On the Low-SNR Capacity of Phase-Shift Keying with Hard-Decision Detection
Creators: name: Gursoy, Mustafa Cenk
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The low-snr capacity of M-ary PSK transmission over both the additive white Gaussian noise (AWGN) and fading channels is analyzed when hard-decision detection is employed at the receiver. Closed-form expressions for the first and second derivatives of the capacity at zero snr are obtained. The spectral-efficiency/bit-energy tradeoff in the low-snr regime is analyzed by finding the wideband slope and the bit energy required at zero spectral efficiency. Practical design guidelines are drawn from the information-theoretic analysis. The fading channel analysis is conducted for both coherent and noncoherent cases, and the performance penalty in the low-power regime for not knowing the channel is identified.
description: To appear in the Proc. of the 2007 IEEE International Symposium on Information Theory
Near-Zero Modes in Superconducting Graphene
Creators: name: Ghaemi, Pouyan
name: Wilczek, Frank
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Vortices in the simplest superconducting state of graphene contain very low energy excitations, whose existence is connected to an index theorem that applies strictly to an approximate form of the relevant Bogoliubov-deGennes equations. When Zeeman interactions are taken into account, the zero modes required by the index theorem are (slightly) displaced. Thus the vortices acquire internal structure, that plausibly supports interesting dynamical phenomena.
description: 9 pages, to appear in Proceedings of the Nobel Symposium on Graphene and Quantum Matter
BB4B: Qualitative Data Collection Consent and Tools
Creators: name: Hibberd, Patricia L.
name: Messersmith, Lisa J
name: Patel, Archana
name: Ladha, Alyana
Publisher: name: Zenodo
Year: 2021
Subjects: Specialized Neonatal Care Units (SNCU)
India
Neonatal Health
Neonatal Intensive Care Units (NICU)
Covid-19

description: Contains Focus Group Discussion and Key Informant Interview Guides as well as Sample Informed Consent Forms for participants.
High temperature ferromagnetism in Co-implanted TiO2 rutile
Creators: name: Akdogan, Numan
name: Nefedov, Alexei
name: Zabel, Hartmut
name: Westerholt, Kurt
name: Becker, Hans-Werner
name: Somsen, Christoph
name: Goek, Safak
name: Bashir, Asif
name: Khaibullin, Rustam
name: Tagirov, Lenar
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on structural, magnetic and electronic properties of Co-implanted TiO2 rutile single crystals for different implantation doses. Strong ferromagnetism at room temperature and above is observed in TiO2 rutile plates after cobalt ion implantation, with magnetic parameters depending on the cobalt implantation dose. While the structural data indicate the presence of metallic cobalt clusters, the multiplet structure of the Co L3 edge in the XAS spectra gives clear evidence for a substitutional Co 2+ state. The detailed analysis of the structural and magnetic properties indicates that there are two magnetic phases in Co-implanted TiO2 plates. One is a ferromagnetic phase due to the formation of long range ferromagnetic ordering between implanted magnetic cobalt ions in the rutile phase, and the second one is a superparamagnetic phase originates from the formation of metallic cobalt clusters in the implanted region. Using x-ray resonant magnetic scattering, the element specific magnetization of cobalt, oxygen and titanium in Co-implanted TiO2 single crystals are investigated. Magnetic dichroism was observed at the Co L edges as well as at the O K edge. The interaction mechanism, which leads to ferromagnetic ordering of substituted cobalt ions in the host matrix, is also discussed.
description: 19 pages, 16 figures
Innovation@Lugano: 3Achain, the triple A blockchain
Creators: Andrea Scarinci
Publisher: name: IEEE
Year: 2022

Slides for Webinar: Innovation@Lugano: 3Achain, the triple A blockchain
Is City administration a good place to drive digital innovation?
Can a City administration inspire companies in the private sector?
In this webinar we'll:
- analyze how City of Lugano is driving blockchain understanding and adoption discuss about the security and stability of a permissioned blockchain, based on a Proof of Authority consensus algorithm.
Innovation is not a choice, is an innate need within us since the first prehistoric stone tools!
Join the webinar to listen, contribute and connect.
The Complexity of Orbits of Computably Enumerable Sets
Creators: name: Cholak, Peter A.
name: Downey, Rod
name: Harrington, Leo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03D25

description: The goal of this paper is to announce there is a single orbit of the c.e. sets with inclusion, $\E$, such that the question of membership in this orbit is $Σ^1_1$-complete. This result and proof have a number of nice corollaries: the Scott rank of $\E$ is $\wock +1$; not all orbits are elementarily definable; there is no arithmetic description of all orbits of $\E$; for all finite $α\geq 9$, there is a properly $Δ^0_α$ orbit (from the proof). A few small corrections made in this version
description: To appear in the Bulletion of Symbolic Logic
Variational assimilation of Lagrangian data in oceanography
Creators: name: Nodet, Maëlle
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider the assimilation of Lagrangian data into a primitive equations circulation model of the ocean at basin scale. The Lagrangian data are positions of floats drifting at fixed depth. We aim at reconstructing the four-dimensional space-time circulation of the ocean. This problem is solved using the four-dimensional variational technique and the adjoint method. In this problem the control vector is chosen as being the initial state of the dynamical system. The observed variables, namely the positions of the floats, are expressed as a function of the control vector via a nonlinear observation operator. This method has been implemented and has the ability to reconstruct the main patterns of the oceanic circulation. Moreover it is very robust with respect to increase of time-sampling period of observations. We have run many twin experiments in order to analyze the sensitivity of our method to the number of floats, the time-sampling period and the vertical drift level. We compare also the performances of the Lagrangian method to that of the classical Eulerian one. Finally we study the impact of errors on observations.
description: 31 pages
The Formation of Filipina Feminisms: Re-imagining Filipina Women’s Movements in Conversations with Gabriela over Time
Creators: name: Tao, Yujin
Publisher: name: Unknown
Year: 2022
Subjects: subject: Asian Feminism
subject: Filipina Feminism
subject: Social Movements
subject: Processual Sociology
subject: Women's Organizing

description: This study is a project of rethinking feminism from the perspective of women in Global South. I use Gabriela, the largest women’s organization in the Philippines, as a case study to investigate the ways that ideological fragmentation and constantly negotiated feminist agendas have affected the remaking of Filipina feminisms. I also analyze how Gabriela's dialogue with international organizations and its inter-generational effects of historical junctures have reshaped Filipina feminist discourses. This paper brings together processual thinking and feminist analysis, urging us to understand Filipina feminism in its unique positionality which was influenced by anti-imperialism, nationalism, and centered around precarity and multiple temporalities. The stories I unveil in this study stress the importance of examining the grounded experiences of women’s organizing with non-teleological assumptions. The conclusions I draw from the case study imply that feminism can be thought as a set of political and cultural projects, not a unified movement, in which conflicts, negotiation, and compromise are always present given complexly contingent relations among other structures such as nationalism, class, and religion.