cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Collective modes of a strongly interacting Bose gas: probing the Mott transition
Creators: name: Snoek, Michiel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We analyze the collective modes of a harmonically trapped, strongly interacting Bose gas in an optical lattice in the vicinity of the Mott insulator transition. For that aim we employ the dynamical Gutzwiller equations, by performing real-time evolution and by solving the equations in linear response. We find a strong dependence on the spatial dimension of the system: while in one dimension the frequency of the dipole mode vanishes at the Mott transition, in higher dimensions the dominant dipole mode is featureless and we find a signature only in the breathing mode. We discuss implications for experiments with bosonic and fermionic atoms.
description: 10 pages, 7 figures; updated figures, published version
Additional file 2 of High and low value care recommended and undertaken prior to knee or hip arthroplasty: a survey study
Creators: name: Mills, Kathryn
name: Brewster, Anne-Marie
name: Hackett, Danella
name: Cheung, Chris
name: Solomon, Michael
name: Naylor, Justine
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: Supplementary Material 2
Proximity effect in Nb-Mo layered films: Transition temperature and critical current dependence on period
Creators: name: Walker, A. E.
name: Veldhorst, J.
name: Myers, D. M.
name: McElrath, Z.
name: Lewis, J. B.
name: Broussard, P. R.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The behavior of the transition temperature and critical current density for a Mo/Nb repeated bilayer system as a function of the number of periods was explored. The measured values of the transition temperature are compared to the theoretical predictions for the proximity effect in the dirty limit. We find that the transition temperature does not decrease as the number of periods increase. In addition, inductive critical current density measurements also show a scaling that indicates the superconductivity properties are not dependent on the number of bilayers.
description: 13 pages, 6 figures, to be published Journal of Applied Physics
Additional file 3 of High and low value care recommended and undertaken prior to knee or hip arthroplasty: a survey study
Creators: name: Mills, Kathryn
name: Brewster, Anne-Marie
name: Hackett, Danella
name: Cheung, Chris
name: Solomon, Michael
name: Naylor, Justine
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy

description: Supplementary Material 3
Entropic uncertainty relations and the stabilizer formalism
Creators: name: Niekamp, Sönke
name: Kleinmann, Matthias
name: Gühne, Otfried
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entropic uncertainty relations express the quantum mechanical uncertainty principle by quantifying uncertainty in terms of entropy. Central questions include the derivation of lower bounds on the total uncertainty for given observables, the characterization of observables that allow strong uncertainty relations, and the construction of such relations for the case of several observables. We demonstrate how the stabilizer formalism can be applied to these questions. We show that the Maassen-Uffink entropic uncertainty relation is tight for the measurement in any pair of stabilizer bases. We compare the relative strengths of variance-based and various entropic uncertainty relations for dichotomic anticommuting observables.
description: 9 pages, 2 figures; published version
Forever Young: Aging Control For Smartphones In Hybrid Networks
Creators: name: Altman, Eitan
name: El-Azouzi, Rachid
name: Menasche, Daniel Sadoc
name: Xu, Yuedong
Publisher: name: arXiv
Year: 2010
Subjects: subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: The demand for Internet services that require frequent updates through small messages, such as microblogging, has tremendously grown in the past few years. Although the use of such applications by domestic users is usually free, their access from mobile devices is subject to fees and consumes energy from limited batteries. If a user activates his mobile device and is in range of a service provider, a content update is received at the expense of monetary and energy costs. Thus, users face a tradeoff between such costs and their messages aging. The goal of this paper is to show how to cope with such a tradeoff, by devising \emph{aging control policies}. An aging control policy consists of deciding, based on the current utility of the last message received, whether to activate the mobile device, and if so, which technology to use (WiFi or 3G). We present a model that yields the optimal aging control policy. Our model is based on a Markov Decision Process in which states correspond to message ages. Using our model, we show the existence of an optimal strategy in the class of threshold strategies, wherein users activate their mobile devices if the age of their messages surpasses a given threshold and remain inactive otherwise. We then consider strategic content providers (publishers) that offer \emph{bonus packages} to users, so as to incent them to download updates of advertisement campaigns. We provide simple algorithms for publishers to determine optimal bonus levels, leveraging the fact that users adopt their optimal aging control strategies. The accuracy of our model is validated against traces from the UMass DieselNet bus network.
description: See also http://www-net.cs.umass.edu/~sadoc/agecontrol/
Nonperturbative Effects on the Ferromagnetic Transition in Repulsive Fermi Gases
Creators: name: He, Lianyi
name: Huang, Xu-Guang
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: It is generally believed that a dilute spin-1/2 Fermi gas with repulsive interactions can undergo a ferromagnetic phase transition to a spin-polarized state at a critical gas parameter $(k_{\rm F}a)_c$. Previous theoretical predictions of the ferromagnetic phase transition have been based on the perturbation theory, which treats the gas parameter as a small number. On the other hand, Belitz, Kirkpatrick, and Vojta (BKV) have argued that the phase transition in clean itinerant ferromagnets is generically of first order at low temperatures, due to the correlation effects that lead to a nonanalytic term in the free energy. The second-order perturbation theory predicts a first-order phase transition at $(k_{\rm F}a)_c=1.054$, consistent with the BKV argument. However, since the critical gas parameter is expected to be of order O(1), perturbative predictions may be unreliable. In this paper we study the nonperturbative effects on the ferromagnetic phase transition by summing the particle-particle ladder diagrams to all orders in the gas parameter. We consider a universal repulsive Fermi gas where the effective range effects can be neglected, which can be realized in a two-component Fermi gas of $^6$Li atoms by using a nonadiabatic field switch to the upper branch of a Feshbach resonance with a positive s-wave scattering length. Our theory predicts a second-order phase transition, which indicates that ferromagnetic transition in dilute Fermi gases is possibly a counterexample to the BKV argument. The predicted critical gas parameter $(k_{\rm F}a)_c=0.858$ is in good agreement with the recent quantum Monte Carlo result $(k_{\rm F}a)_c=0.86$ for a nearly zero-range potential [S. Pilati, \emph{et al}., Phys. Rev. Lett. {\bf 105}, 030405 (2010)]. We also compare the spin susceptibility with the quantum Monte Carlo result and find good agreement.
description: 11 pages + 7 figures, more references added, version published in Physical Review A
Carbon Nanotubes as Cooper-Pair Beam Splitters
Creators: name: Herrmann, Lorenz
name: Portier, F.
name: Roche, P.
name: Levy Yeyati, A.
name: Kontos, T.
name: Strunk, Christoph
Publisher: name: Universität Regensburg
Year: 2010
Subjects: subject: 530 Physik
subject: 73.23.-b
subject: 73.63.Fg

description: We report on conductance measurements in carbon nanotube based double quantum dots connected to two normal electrodes and a central superconducting finger. By operating our devices as beam splitters, we provide evidence for crossed Andreev reflections tunable in situ. This opens an avenue to more sophisticated quantum opticslike experiments with spin entangled electrons.
Soliton pair creation in classical wave scattering
Creators: name: Demidov, S. V.
name: Levkov, D. G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study classical production of soliton-antisoliton pairs from colliding wave packets in (1+1)-dimensional scalar field model. Wave packets represent multiparticle states in quantum theory; we characterize them by energy E and particle number N. Sampling stochastically over the forms of wave packets, we find the entire region in (E,N) plane which corresponds to classical creation of soliton pairs. Particle number is parametrically large within this region meaning that the probability of soliton-antisoliton pair production in few-particle collisions is exponentially suppressed.
description: 16 pages, 8 figures, journal version; misprint corrected
Additional file 1 of Myocardial function including estimates of myocardial work in young adults born very preterm or with extremely low birthweight - a cohort study
Creators: name: Engan, Britt
name: Omdal, Tom R.
name: Greve, Gottfried
name: Vollsaeter, Maria
name: Leirgul, Elisabeth
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Developmental Biology

description: Additional File 1: Flow chart of the study population
Visual - near-infrared properties of the interstellar extinction towards the Galactic bulge with RR Lyrae stars
Creators: name: Hajdu, Gergely
name: Catelan, Márcio
name: Dékány, István
name: Grebel, Eva
Publisher: name: Zenodo
Year: 2019

description: Towards the bulge, studies of interstellar extinction are generally limited by uncertainties in the individual distances, magnitudes, and colors of the most commonly utilized stellar tracers. RR Lyrae stars, however, have well known absolute magnitudes and colors; furthermore, their distribution is known to be strongly centered around the Galactic center, easing the problem of unknown individual distances. We exploit these properties of RR Lyrae variables with large samples derived from wide-area surveys (OGLE, VVV) to study the interstellar extinction in optical and near-infrared wavelengths towards the Galactic bulge.
BCS superconductivity in metallic nanograins: Finite-size corrections, low-energy excitations, and robustness of shell effects
Creators: name: Garcia-Garcia, Antonio
name: Urbina, Juan Diego
name: Richter, Klaus
name: Yuzbashyan, Emil
name: Altshuler, Boris
Publisher: name: Universität Regensburg
Year: 2011
Subjects: subject: superconductivity, shell effects, semiclassical methods, mesoscopic physics
subject: 530 Physik
subject: 74.20.Fg,75.10.Jm,71.10.Lii

description: We combine the BCS self-consistency condition, a semiclassical expansion for the spectral density and interaction matrix elements to describe analytically how the superconducting gap depends on the size and shape of a two- and three-dimensional superconducting grain. In chaotic grains mesoscopic fluctuations of the matrix elements lead to a smooth dependence of the order parameter on the excitation energy. In the integrable case we find shell effects; i.e., for certain values of the electron number N a small change in N leads to large changes in the energy gap. With regard to possible experimental tests we provide a detailed analysis of the dependence of the gap on the coherence length and the robustness of shell effects under small geometrical deformations.
Investigation of bridgeless single-phase solutions for ac-dc power factor corrected converters
Creators: name: Alam, Md. Muntasir Ul
Publisher: name: University of British Columbia
Year: 2017

description: In modern power supplies and battery chargers, a front-end power factor correction (PFC) AC-DC converter is used to comply with regulatory requirements for input current harmonics. The prevalence of standards and recommended practices to meet harmonic current limits has gained, and continues to gain, momentum over recent years. Additionally, the improvement of overall converter efficiency is critical for the emergence and acceptance of these converter technologies, to meet the standard of efficiency and power factor requirements. This dissertation presents some innovative solutions for bridgeless non-isolated and isolated PFC AC-DC converters. All proposed converter solutions realize bridgeless converter operation to reduce conduction losses and operate in hybrid resonant pulse-width-modulation (HRPWM) mode. The PWM switches share the same gating signal, so the converter does not need extra circuitry to sense the positive and negative ac input line-cycle operation. The first contribution is a non-isolated bridgeless AC-DC converter, which has inherent inrush current-limiting capabilities. The converter architecture also enables simple implementation of lightning and surge protection systems. Moreover, this converter can survive sustained over-voltage events and can limit the voltage stress on the converter and downstream components. The second contribution is a non-isolated bridgeless AC-DC converter, which realizes soft-switching operation to reduce switching losses. This converter can operate at high switching frequency to increase power density. The third contribution is a three-level non-isolated bridgeless AC-DC converter, which has high voltage gain. This converter also provides soft-switching operation of all the power devices. Due to the three level architecture, all commutations occur with a voltage level equivalent to half the output voltage, which further reduces switching losses. This converter can utilize lower voltage rated devices, which reduces system cost. The final contribution is a single-stage bridgeless isolated AC-DC converter. This converter shows low conduction loss due to bridgeless operation and low voltage stress of the secondary diodes, low switching loss due to soft-switching operation, and a transformer that has no dc magnetizing current and does not store energy. These characteristics minimize the transformer size and increases transformer efficiency.
Quantum particle statistics on the holographic screen leads to Modified Newtonian Dynamics (MOND)
Creators: name: Pazy, E.
name: Argaman, N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Employing a thermodynamic interpretation of gravity based on the holographic principle and assuming underlying particle statistics, fermionic or bosonic, for the excitations of the holographic screen leads to Modified Newtonian Dynamics (MOND). A connection between the acceleration scale $a_0$ appearing in MOND and the Fermi energy of the holographic fermionic degrees of freedom is obtained. In this formulation the physics of MOND results from the quantum-classical crossover in the fermionic specific heat. However, due to the dimensionality of the screen, the formalism is general and applies to two dimensional bosonic excitations as well. It is shown that replacing the assumption of the equipartition of energy on the holographic screen by a standard quantum-statistical-mechanics description wherein some of the degrees of freedom are frozen out at low temperatures is the physical basis for the MOND interpolating function ${\tilde μ}$. The interpolating function ${\tilde μ}$ is calculated within the statistical mechanical formalism and compared to the leading phenomenological interpolating functions, most commonly used. Based on the statistical mechanical view of MOND, its cosmological implications are re-interpreted: the connection between $a_0$ and the Hubble constant is described as a quantum uncertainty relation; and the relationship between $a_0$ and the cosmological constant is better understood physically.
Near-IR variability of the bulge stellar population
Creators: name: Minniti, Dante
Publisher: name: Zenodo
Year: 2019

description: Variable stars in the near-IR can be used to characterise in detail the composite stellar populations of the Galactic bulge.
Pulsating variable stars in particular (RR Lyrae, Miras, and classical Cepheids), are excellent distance indicators, as well as reddening probes. They sample the extremes of the Milky Way stellar populations: from the very old and metal-poor to the very young and metal-rich, passing through the intermediate-age stars. Their study has an impact on the fields of Galactic structure, stellar evolution, star clusters, and the interstellar medium, among others. I will cover the results on the pulsating variable stars in the complex environment of the Galactic bulge, concentrating mostly on the VISTA Variables of the Via Lactea Survey (VVV), that is a large ESO Public near-IR survey of the Southern Milky Way (http://vvvsurvey.org).
In the first part of the talk I will describe the design, observations, data processing, and current status of the VVV Survey and its on-going extension VVVX. In the second part I will summarize the discoveries and latest results enabled by this and other large near-IR variability surveys of the Milky Way.
Additional file 2 of Myocardial function including estimates of myocardial work in young adults born very preterm or with extremely low birthweight - a cohort study
Creators: name: Engan, Britt
name: Omdal, Tom R.
name: Greve, Gottfried
name: Vollsaeter, Maria
name: Leirgul, Elisabeth
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Developmental Biology

description: Additional File 2: Characteristics and echocardiographic measures of participants born very preterm/with extremely low birthweight by cohort
Genomic Structure and Chromosomal Location of the Rat Gene Encoding the Zinc Finger Transcription Factor Kid-1
Creators: name: Witzgall, Ralph
name: Volk, Rüdiger
name: Yeung, Raymond S.
name: Bonventre, Joseph V.
Publisher: name: Universität Regensburg
Year: 1994
Subjects: subject: 330 Wirtschaft
subject: 610 Medizin

description: We have previously cloned and sequenced a novel zinc finger cDNA, Kid-1 , from the rat. Because of its developmentally regulated expression pattern and its suppression after renal injury, as well as its kindey-predominant expression, we propose that Kid-1 is likely to play an important role in renal gene regulation. Kid-1 encodes a predicted protein with 13 zinc fingers at the carboxy end and Krüppel-associated box (KRAB) A and B regions at the amino terminus. Expression of a Kid-1-GAL4 chimeric protein results in strong transcriptional repression of cotransfected constructs containing GAL4 binding sites and a chloramphenicol acetyl transferase gene driven by either a minimal promoter or a SV40 enhancer. We now report the cloning, structural organization, and chromosomal localization of the Kid-1 gene. The Kid-1 gene is composed of four exons and three introns, closely reflecting the organization of the Kid-1 protein. The KRAB A and B regions are encoded by the second and third exons, respectively. The entire zinc finger region is encoded by the fourth exon. Using a combination of linkage analysis and somatic cell hybrid analysis, Kid-1was mapped to rat chromosome (RNO) 10. Kid-1, Il3, and Sparc form a tight linkage group on RNO10. Regional sublocalization to RNO10q21.3-q22 was established by fluorescence in situ hybridization.
On the flow-level stability of data networks without congestion control: the case of linear networks and upstream trees
Creators: name: Feuillet, Mathieu
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: Networking and Internet Architecture (cs.NI)
subject: Performance (cs.PF)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: In this paper, flow models of networks without congestion control are considered. Users generate data transfers according to some Poisson processes and transmit corresponding packet at a fixed rate equal to their access rate until the entire document is received at the destination; some erasure codes are used to make the transmission robust to packet losses. We study the stability of the stochastic process representing the number of active flows in two particular cases: linear networks and upstream trees. For the case of linear networks, we notably use fluid limits and an interesting phenomenon of "time scale separation" occurs. Bounds on the stability region of linear networks are given. For the case of upstream trees, underlying monotonic properties are used. Finally, the asymptotic stability of those processes is analyzed when the access rate of the users decreases to 0. An appropriate scaling is introduced and used to prove that the stability region of those networks is asymptotically maximized.
Subgap transport in superconductor--semiconductor hybrid islands: Weak and strong coupling regimes
Creators: name: Valentini, Marco
name: Souto, Rubén Seoane
name: Borovkov, Maksim
name: Krogstrup, Peter
name: Meir, Yigal
name: Leijnse, Martin
name: Danon, Jeroen
name: Katsaros, Georgios
Publisher: name: arXiv
Year: 2024
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Superconductor--semiconductor hybrid systems play a crucial role in realizing nanoscale quantum devices, including hybrid qubits, Majorana bound states, and Kitaev chains. For such hybrid devices, subgap states play a prominent role in their operation. In this work, we study such subgap states via Coulomb and tunneling spectroscopy through a superconducting island defined in a semiconductor nanowire fully coated by a superconductor. We systematically explore regimes ranging from an almost decoupled island to the open configuration. In the weak coupling regime, the experimental observations are very similar in the absence of a magnetic field and when one flux quantum is piercing the superconducting shell. Conversely, in the strong coupling regime, significant distinctions emerge between the two cases. We ascribe this different behavior to the existence of subgap states at one flux quantum, which become observable only for sufficiently strong coupling to the leads. We support our interpretation using a simple model to describe transport through the island. Our study highlights the importance of studying a broad range of tunnel couplings for understanding the rich physics of hybrid devices.
A Fast Frequency-Domain Algorithm for Gravitational Self-Force: I, Circular Orbits in Schwarzschild Spacetime
Creators: name: Akcay, Sarp
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Fast, reliable orbital evolutions of compact objects around massive black holes will be needed as input for gravitational wave search algorithms in the data stream generated by the planned Laser Interferometer Space Antenna (LISA). Currently, the state of the art is a time-domain code by [Phys. Rev. D{\bf 81}, 084021, (2010)] that computes the gravitational self-force on a point-particle in an eccentric orbit around a Schwarzschild black hole. Currently, time-domain codes take up to a few days to compute just one point in parameter space. In a series of articles, we advocate the use of a frequency-domain approach to the problem of gravitational self-force (GSF) with the ultimate goal of orbital evolution in mind. Here, we compute the GSF for a particle in a circular orbit in Schwarzschild spacetime. We solve the linearized Einstein equations for the metric perturbation in Lorenz gauge. Our frequency-domain code reproduces the time-domain results for the GSF up to $\sim 1000$ times faster for small orbital radii. In forthcoming companion papers, we will generalize our frequency-domain methods to include bound (eccentric) orbits in Schwarzschild and (eventually) Kerr spacetimes for computing the GSF, where we will employ the method of extended homogeneous solutions [Phys. Rev. D {\bf 78}, 084021 (2008)].
description: 26 pages, 4 figures, with minor typos now fixed
Investigating autophagy modulation in breast cancer
Creators: name: Bortnik, Svetlana
Publisher: name: University of British Columbia
Year: 2020

description: Autophagy, a lysosome-mediated degradation and recycling process that functions to promote stress adaptation and cell survival, is a promising novel target for anticancer therapy. Breast cancer, the most prevalent cancer and the 2nd leading cause of cancer deaths in Canadian women, consists of many diseases (intrinsic subtypes), which are all treated differently. Several studies indicate that some breast cancer subtypes might be more sensitive to autophagy inhibition than others. However, our knowledge of prognostic and predictive values of different autophagy-related biomarkers, as well as the effectiveness of autophagy inhibitors, in various breast cancer subtypes, essential for effective patient treatment selection and potentially better outcomes, is extremely limited. Using a tissue microarray from a large population-based cohort of breast cancer patients, we evaluated prognostic values of two autophagy proteins, the microtubule-associated protein 1 light chain 3B (MAP1LC3B, or LC3B), and a cysteine protease ATG4B, across different breast cancer subtypes. We found that LC3B expression was highest in triple-negative, in particular - basal-like, breast cancers, a group of malignancies characterized by an extremely aggressive course of disease, inferior survival, and limited treatment options. High LC3B expression was associated with adverse outcomes across all breast cancer subtypes. A potential drug target ATG4B demonstrated a poor prognostic value in HER2 positive breast cancers, but a favorable prognostic value in Luminal A breast cancers. Using in vitro and in vivo breast cancer models, we studied the roles of autophagy, in general, and ATG4B, in particular, in different breast cancer subtypes. We tested the possibility of sensitization of breast cancer cells to chemotherapy or targeted therapy by modulating autophagy. We showed that treatment with HCQ is a useful strategy to sensitize triple-negative breast cancer cells to chemotherapy and that ATG4B inhibition is a promising approach in combinational treatment of HER2 positive breast cancers. In conclusion, using a context-dependent approach to autophagy evaluation and modulation in breast cancers, we discovered novel associations with prognosis and sensitivity to treatment across various breast cancer subtypes. These findings should be taken into consideration when planning future pre-clinical and clinical studies with autophagy inhibitors.
Observation of a non-adiabatic geometric phase for elastic waves
Creators: name: Boulanger, Jérémie
name: Bihan, Nicolas Le
name: Catheline, Stefan
name: Rossetto, Vincent
Publisher: name: arXiv
Year: 2011
Subjects: subject: Classical Physics (physics.class-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report the experimental observation of a geometric phase for elastic waves in a waveguide with helical shape. The setup reproduces the experiment by Tomita and Chiao [A. Tomita, R.Y. Chiao, Phys. Rev. Lett. 57 (1986) 937-940, 2471] that showed first evidence of a Berry phase, a geometric phase for adiabatic time evolution, in optics. Experimental evidence of a non-adiabatic geometric phase has been reported in quantum mechanics. We have performed an experiment to observe the polarization transport of classical elastic waves. In a waveguide, these waves are polarized and dispersive. Whereas the wavelength is of the same order of magnitude as the helix's radius, no frequency dependent correction is necessary to account for the theoretical prediction. This shows that in this regime, the geometric phase results directly from geometry and not from a correction to an adiabatic phase.
description: 13 figures
Photoluminescence of Tetrameric copper(I) Iodide Complexes in Solution
Creators: name: Vogler, Arnd
name: Kunkely, Horst
Publisher: name: Universität Regensburg
Year: 1986
Subjects: subject: 540 Chemie

description: Abstract: The colorless complexes [Cu(py)I], and [Cu(mor)I], (py = pyridine; mor = morpholine) were shown to be photoluminescent in noncoordinating solvents such as benzene, CH2Cl2, or acetone at room temperature. The red emission ( λmax= 698 nm) of the pyridine complex in benzene is quite intense (φ= 0.04) and decays with a lifetime of τ = 0.9 X s. The red photoluminescence (λmax= 654 nm) of the morpholine complex is much weaker (φ= 0.004) and decays with τ = 0.3 X 10” s. It is suggested that the emitting state of both complexes is a metal-centered 3d94s1 excited state of Cu(I), but this state is strongly modified by copper-copper interaction in the tetramer which consists of a [CUI], cubane core.
Microlensing events in the Galactic Bulge
Creators: name: Navarro, Maria Gabriela
Publisher: name: Zenodo
Year: 2019

description: In this work the search or microlensing events in the inner part of the bulge using the VVV data. We have detected 630 microlensing events within an area of 20.68deg2 around the galactic center. The Einstein ring crossing time is the only parameter which has a physical meaning and is degenerate thus can only be studied statistically in large numbers including in the calculations the distributions of the parameters involved which require models of the Milky Way. In this case, the proper motions distribution of different galactic populations can be useful to interpret the results. Also, the study of specific events became attractive. The long timescale events favor the presence of dark stellar remnants such as black holes and neutron stars which are important ingredients in our understanding of stellar evolution, mass distribution, galaxy evolution and structure, dark matter balance, etc.
Additional file 1 of JAGN1 mutation with distinct clinical features; two case reports and literature review
Creators: name: Hojabri, Mahsa
name: Farsi, Yeganeh
name: Jamee, Mahnaz
name: Abolhassani, Hassan
name: Khani, Hedieh Haji Khodaverdi
name: Karimi, Abdollah
name: Mesdaghi, Mehrnaz
name: Chavoshzadeh, Zahra
name: Sharafian, Samin
Publisher: name: figshare
Year: 2023
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Supplementary Material 1
Two-magnon Raman scattering in A$_{0.8}$Fe$_{1.6}$Se$_2$ systems: competition between superconductivity and antiferromagnetic order
Creators: name: Zhang, A. M.
name: Xiao, J. H.
name: Li, Y. S.
name: He, J. B.
name: Wang, D. M.
name: Chen, G. F.
name: Normand, B.
name: Zhang, Q. M.
name: Xiang, T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have performed Raman-scattering measurements on high-quality single crystals of A$_{0.8}$Fe$_{1.6}$Se$_2$ superconductors of several compositions. We find a broad, asymmetric peak around 1600 cm$^{-1}$ (200 meV), which we identify as a two-magnon process involving optical magnons. The intensity of the two-magnon peak falls sharply on entering the superconducting phase. This effect, which is entirely absent in the non-superconducting system KFe$_{1.5}$Se$_2$, requires a strong mutual exclusion between antiferromagnetism and superconductivity arising from proximity effects within regions of microscale phase separation.
description: 8 pages, 5 figures
Resonance Raman spectroscopy study of protonated porphyrin
Creators: name: A. Gorski
name: A. Starukhin
name: S. Stavrov
name: S. Gawinkowski
name: J. Waluk
Publisher: name: Zenodo
Year: 2016
Subjects: Raman microscopy, protonated porphyrin, distortion of porphyrin macrocycle, out-of-plane modes, DFT analysis and modeling

description: Resonance Raman microscopy was used to study the resonance Raman scattering of the diacid (diprotonated form) of free-base porphyrin (21H,23H-porphine) in a crystal powder and KBr pellets. Intensive lines in the spectral range between 100 ¸ 1000 cm-1 have been detected and assigned as spectral manifestation of out-of-plane modes. The Raman spectra were simulated by means of DFT methods and compared with the experimental data. It is evident from experimental and theoretical results that the activation of out-of-plane modes arises from saddle distortion of the porphyrin macrocycle upon formation of its diprotonated form.
Mapping class group relations, Stein fillings, and planar open book decompositions
Creators: name: Wand, Andy
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geometric Topology (math.GT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: The aim of this paper is to use mapping class group relations to approach the `geography' problem for Stein fillings of a contact 3-manifold. In particular, we adapt a formula of Endo and Nagami so as to calculate the signature of such fillings as a sum of the signatures of basic relations in the monodromy of a related open book decomposition. We combine this with a theorem of Wendl to show that for any Stein filling of a contact structure supported by a planar open book decomposition, the sum of the signature and Euler characteristic depends only on the contact manifold. This gives a simple obstruction to planarity, which we interpret in terms of existence of certain configurations of curves in a factorization of the monodromy. We use these techniques to demonstrate examples of non-planar structures which cannot be shown non-planar by previously existing methods.
description: Final version, includes minor stylistic revisions suggested by referee. Accepted for publication by the Journal of Topology
Computing Bounds on Network Capacity Regions as a Polytope Reconstruction Problem
Creators: name: Kim, Anthony
name: Medard, Muriel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We define a notion of network capacity region of networks that generalizes the notion of network capacity defined by Cannons et al. and prove its notable properties such as closedness, boundedness and convexity when the finite field is fixed. We show that the network routing capacity region is a computable rational polytope and provide exact algorithms and approximation heuristics for computing the region. We define the semi-network linear coding capacity region, with respect to a fixed finite field, that inner bounds the corresponding network linear coding capacity region, show that it is a computable rational polytope, and provide exact algorithms and approximation heuristics. We show connections between computing these regions and a polytope reconstruction problem and some combinatorial optimization problems, such as the minimum cost directed Steiner tree problem. We provide an example to illustrate our results. The algorithms are not necessarily polynomial-time.
description: Appeared in the 2011 IEEE International Symposium on Information Theory, 5 pages, 1 figure
Additional file 1 of Indicators of integrating oral health care within universal health coverage and general health care in low-, middle-, and high-income countries: a scoping review
Creators: name: Jashni, Yassaman Karimi
name: Emari, Fatemeh
name: Morris, Martin
name: Allison, Paul
Publisher: name: figshare
Year: 2023
Subjects: Medicine
Biotechnology
Cancer
Science Policy

description: Supplementary Material 1
Lattice Ginzburg-Landau Model of a Ferromagnetic p-wave Pairing Phase in Superconducting Materials and an Inhomogeneous Coexisting State
Creators: name: Shimizu, Akihiro
name: Ozawa, Hidetoshi
name: Ichinose, Ikuo
name: Matsui, Tetsuo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the interplay of the ferromagnetic (FM) state and the p-wave superconducting (SC) state observed in several materials such as UCoGe and URhGe in a totally nonperturbative manner. To this end, we introduce a lattice Ginzburg-Landau model that is a genuine generalization of the phenomenological Ginzburg-Landau theory proposed previously in the continuum and also a counterpart of the lattice gauge-Higgs model for the s-wave SC transition, and study it numerically by Monte-Carlo simulations. The obtained phase diagram has qualitatively the same structure as that of UCoGe in the region where the two transition temperatrures satisfy $T_{\rm FM}>T_{\rm SC}$. For $T_{\rm FM}/T_{\rm SC} < 0.7$, we find that the coexisting region of FM and SC orders appears only near the surface of the lattice, which describes an inhomogeneous FMSC coexisting state.
Performance Evaluation of Opportunistic Routing Protocols for Multi-hop Wireless Networks
Creators: name: Guercin, Sergio Rolando
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2019
Subjects: Wireless Sensor Network
Underwater wireless sensor network
Multi-hop wireless network
Mobile ad hoc network
GEDAR
DBR

description: Nowadays, Opportunistic Routing (OR) is widely considered to be the most important paradigm for Multi-hop wireless networks (MWNs). It exploits the broadcast nature of wireless medium to propagate information from one point to another within the network. In OR scheme, when a node has new information to share, it rst needs to set its forwarding list which include the IDs and/or any relevant information to its best suited neighboring nodes. This operation is supported by the use of appropriate metrics. Then, it executes a coordination algorithm allowing transmission reliability and high throughput among the next-hop forwarders. In this paper, we provide a comprehensive guide to understand the characteristics and challenges faced in the area of opportunistic routing protocols in MWNs. Moreover, since the planet we live on is largely covered by water, OR protocols have gained much attention during the last decade in real-time aquatic applications, such as oil/chemical spill monitoring, ocean resource management, anti-submarine missions and so on. One of the major problems in Underwater Wireless Sensor Network (UWSNs) is determining an e cient and reliable routing methodology between the source node and the destination node. Therefore, designing e cient and robust routing protocols for UWSNs became an attractive topic for researchers. This paper seeks to address in detail the key factors of underwater sensor network. Furthermore, it calls into question 5 state-of-the-art routing protocols proposed for UWSN: The Depth-Based Routing protocol (DBR), the Energy-E cient Depth-Based Routing protocol (EEDBR), the Hydraulic-pressure-based anycast routing protocol (Hydrocast), the Geographic and opportunistic routing protocol with Depth Adjustment for mobile underwater sensor networks (GEDAR), and the Void- Aware Pressure Routing for underwater sensor networks (VAPR). Finally, it covers the performance of those protocol through the use of the R programming language.
Presentations and Tietze transformations of C*-algebras
Creators: name: Grilliette, Will
Publisher: name: arXiv
Year: 2010
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46

description: In this work, I develop a new view of presentation theory for C*-algebras, both unital and non-unital, heavily grounded in classical notions from algebra. In particular, I introduce Tietze transformations for these presentations, which lead to a transformation theorem analogous to Tietze's 1908 result in group theory.
description: 17 pages
Quantum adiabatic theorem for chemical reactions and systems with time-dependent orthogonalization
Creators: name: Arulsamy, Andrew Das
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 81P10, 81Q15

description: A general quantum adiabatic theorem with and without the time-dependent orthogonalization is proven, which can be applied to understand the origin of activation energies in chemical reactions. Further proofs are also developed for the oscillating Schwinger Hamiltonian to establish the relationship between the internal (due to time-dependent eigenfunctions) and external (due to time-dependent Hamiltonian) time scales. We prove that this relationship needs to be taken as an independent quantum adiabatic approximation criterion. We give four examples, including logical expositions based on the spin-1/2 two-level system to address the gapped and gapless (due to energy level crossings) systems, as well as to understand how does this theorem allows one to study dynamical systems such as chemical reactions.
description: To be published in Prog. Theor. Phys. (Kyoto)
Additional file 5 of A molecular study on recombinant pullulanase type I from Metabacillus indicus
Creators: name: Al-Mamoori, Zahraa Z.
name: Embaby, Amira M.
name: Hussein, Ahmed
name: Mahmoud, Hoda E.
Publisher: name: figshare
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biotechnology
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Marine Biology

description: Supplementary Material 5
Intervalence-Transfer zwischen Hexaammincobalt(III) und Hexacyanoruthenat(II)
Creators: name: Vogler, Arnd
name: Kisslinger, J.
Publisher: name: Universität Regensburg
Year: 1982
Subjects: subject: 540 Chemie

description: siehe auch: "Intervalence Transfer between Hexaaminecobalt(III) and Hexacyanoruthenate(II)", Angewandte Chemie International Edition in English, Vol.21, 1982, S.77-78
Spin-orbit coupling and the conservation of angular momentum
Creators: name: Hnizdo, V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: In nonrelativistic quantum mechanics, the total (i.e. orbital plus spin) angular momentum of a charged particle with spin that moves in a Coulomb plus spin-orbit-coupling potential is conserved. In a classical nonrelativistic treatment of this problem, in which the Lagrange equations determine the orbital motion and the Thomas equation yields the rate of change of the spin, the particle's total angular momentum in which the orbital angular momentum is defined in terms of the kinetic momentum is generally not conserved. However, a generalized total angular momentum, in which the orbital part is defined in terms of the canonical momentum, is conserved. This illustrates the fact that the quantum-mechanical operator of momentum corresponds to the canonical momentum of classical mechanics.
description: 10 pages, as published by Eur. J. Phys
Electronic properties of AFM-defined semiconductor nanostructures
Creators: name: Lüscher, Silvia
name: Held, Ryan
name: Fuhrer, Andreas
name: Heinzel, Thomas
name: Ensslin, Klaus
name: Bichler, Max
name: Wegscheider, Werner
Publisher: name: Universität Regensburg
Year: 2001
Subjects: subject: Semiconductor nanostructures; Nanofabrication
subject: 530 Physik

description: The quest for even smaller and better-controlled semiconductor nanostructures calls for improved nanofabrication techniques. We succeeded in patterning metallic and semiconducting nanostructures by using local oxidation-mediated via a voltage between a conducting surface and a close-by tip of an atomic force microscope (AFM). In particular, we were able to control the electronic properties of quantum point contacts, long quantum wires as well as single electron transistors embedded in an AlGaAs two-dimensional electron gas (2DEG). This article focuses on the technological aspects of this novel nanofabrication method.
Borderline variational problems for fractional Hardy-Schrödinger operators
Creators: name: Shakerian, Shaya
Publisher: name: University of British Columbia
Year: 2017

description: In this thesis, we study properties of the fractional Hardy-Schrödinger operator L_(γ,α)≔(-∆)^(α/(2 ))- γ/〖|x|〗^α both on R^n and on its bounded domains. The following functional inequality is key to our variational approach. C〖(∫_(R^n)〖 〖|u|〗^(2_α^* (s))/〖|x|〗^s dx〗)〗^(2/(2_α^* (s)))≤ ∫_(R^n)〖 〖|(-∆)^(α/(4 )) u|〗^2 dx〗- γ∫_(R^n)〖 〖|u|〗^2/〖|x|〗^α dx,〗 where 0 ≤ s < α < 2, n > α, 2_α^* (s)=(2(n-s))/(n-α) and γ< γ_H(α), the latter being the best fractional Hardy constant on R^n. We address questions regarding the attainability of the best constant C > 0 attached to this inequality. This allows us to establish the existence of non-trivial weak solutions for the following doubly critical problem on R^n, L_(γ,α) u=〖|u|〗^(2_α^*-2)u + (〖|u|〗^(2_α^* (s)-2) u)/〖|x|〗^s in R^n, where 〖2_α^*≔2〗_α^* (0). We then look for least-energy solutions of the following linearly perturbed non-linear boundary value problem on bounded subdomains of R^n containing the singularity 0: (L_(γ,α)-λΙ)u= 〖|u|〗^(2_α^* (s)-1)/〖|x|〗^s on Ω, We show that if γ is below a certain threshold γ_crit(α), then such solutions exist for all 〖0<λ<λ〗_1 (L_(γ,α) ), the latter being the first eigenvalue of L_(γ,α). On the other hand, for γ_crit (α)<γ<γ_H (α), we prove existence of such solutions only for those λ in (0,λ_1 (L_(γ,α))) for which Ω has a positive fractional Hardy- Schrödinger mass m_(γ,λ)^α (Ω). This latter notion is introduced by way of an invariant of the linear equation (L_(γ,α)-λΙ)u= 0 on Ω. We then study the effect of non-linear perturbation 〖h(x)u〗^(q-1), where h∈C^0 (¯Ω), h≥0 and 2<q<2_α^*. Our analysis shows that the existence of solutions is guaranteed by this perturbation whenever 0≤γ≤γ_crit (α), while for γ_crit (α)<γ<γ_H (α), it depends on both the perturbation and the geometry of the domain.
Real algebraic geometry for matrices over commutative rings
Creators: name: Cimpric, Jaka
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14P, 13J30, 47A56

description: We define and study preorderings and orderings on rings of the form $M_n(R)$ where $R$ is a commutative unital ring. We extend the Artin-Lang theorem and Krivine-Stengle Stellensätze (both abstract and geometric) from $R$ to $M_n(R)$. While the orderings of $M_n(R)$ are in one-to-one correspondence with the orderings of $R$, this is not true for preorderings. Therefore, our theory is not Morita equivalent to the classical real algebraic geometry.