cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Exact asymptotic distribution of change-point mle for change in the mean of Gaussian sequences
Creators: name: Fotopoulos, Stergios B.
name: Jandhyala, Venkata K.
name: Khapalova, Elena
Publisher: name: arXiv
Year: 2010
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: We derive exact computable expressions for the asymptotic distribution of the change-point mle when a change in the mean occurred at an unknown point of a sequence of time-ordered independent Gaussian random variables. The derivation, which assumes that nuisance parameters such as the amount of change and variance are known, is based on ladder heights of Gaussian random walks hitting the half-line. We then show that the exact distribution easily extends to the distribution of the change-point mle when a change occurs in the mean vector of a multivariate Gaussian process. We perform simulations to examine the accuracy of the derived distribution when nuisance parameters have to be estimated as well as robustness of the derived distribution to deviations from Gaussianity. Through simulations, we also compare it with the well-known conditional distribution of the mle, which may be interpreted as a Bayesian solution to the change-point problem. Finally, we apply the derived methodology to monthly averages of water discharges of the Nacetinsky creek, Germany.
description: Published in at http://dx.doi.org/10.1214/09-AOAS294 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Theory for a dissipative droplet soliton excited by a spin torque nanocontact
Creators: name: Hoefer, M. A.
name: Silva, T. J.
name: Keller, Mark W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: A novel type of solitary wave is predicted to form in spin torque oscillators when the free layer has a sufficiently large perpendicular anisotropy. In this structure, which is a dissipative version of the conservative droplet soliton originally studied in 1977 by Ivanov and Kosevich, spin torque counteracts the damping that would otherwise destroy the mode. Asymptotic methods are used to derive conditions on perpendicular anisotropy strength and applied current under which a dissipative droplet can be nucleated and sustained. Numerical methods are used to confirm the stability of the droplet against various perturbations that are likely in experiments, including tilting of the applied field, non-zero spin torque asymmetry, and non-trivial Oersted fields. Under certain conditions, the droplet experiences a drift instability in which it propagates away from the nanocontact and is then destroyed by damping.
description: 15 pages, 12 figures
Contribution of Piezo1 mechanosensitive channels to astrocyte calcium signaling
Creators: name: Ko, Rebecca Wai Yin
Publisher: name: University of British Columbia
Year: 2018

description: Astrocyte calcium (Ca²⁺) signaling is involved in the regulation of physiological processes such as synaptic activity and vascular tone in the brain. Recent developments in tools to monitor Ca²⁺ signals have revealed a novel type of spontaneous Ca²⁺ transient that is localized to microdomains in the fine astrocytic processes. However, the molecular mechanisms underlying these signals have not been fully characterized. Based on data from rodent brain transcriptomic and proteomic studies, we identified Piezo1, a mechanosensitive cation channel, as a potential candidate for mediating these Ca²⁺ transients. In Chapter 2, we performed two-photon imaging of the membrane-tethered, genetically encoded Ca²⁺ indicator Lck-GCaMP5 in cultured astrocytes and developed an algorithm for extracting and analyzing the microdomain Ca²⁺ signals. Using a combination of pharmacological and siRNA approaches, we showed that Piezo1 channels contribute to these spontaneous Ca²⁺ transients. We also conducted preliminary imaging experiments in brain slice astrocytes and found that spontaneous Ca²⁺ signals in the endfoot compartments were sensitive to pharmacological modulators of Piezo1. In Chapter 3, we performed immunostaining using strategies that were optimized to target subcellular locations where Piezo1 expression had previously been reported in other cell types. Our results indicated that Piezo1 is localized to subcellular compartments relevant to mechanosensation; Piezo1 immunoreactivity was localized to discrete clusters on the plasma membrane and associated with focal adhesion and actin stress fibers in cultured astrocytes, and Piezo1 expression was observed within the endfoot processes of brain slice astrocytes. Lastly, in Chapter 4, we showed that an osmotic stress model of astrocyte swelling could activate Piezo1-mediated Ca²⁺ microdomain signals in cultured astrocytes. Taken together, the data provide evidence that Piezo1 contributes to spontaneous Ca²⁺ microdomain signals in astrocytes in both cell culture and acute brain slices, and suggest that astrocyte Ca²⁺ signaling may play a role in integrating mechanical stimuli to regulate brain function in physiological and pathological processes involving changes in mechanical force.
Averaged Iterative Water-Filling Algorithm: Robustness and Convergence
Creators: name: Hong, Mingyi
name: Garcia, Alfredo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: The convergence properties of the Iterative water-filling (IWF) based algorithms have been derived in the ideal situation where the transmitters in the network are able to obtain the exact value of the interference plus noise (IPN) experienced at the corresponding receivers in each iteration of the algorithm. However, these algorithms are not robust because they diverge when there is it time-varying estimation error of the IPN, a situation that arises in real communication system. In this correspondence, we propose an algorithm that possesses convergence guarantees in the presence of various forms of such time-varying error. Moreover, we also show by simulation that in scenarios where the interference is strong, the conventional IWF diverges while our proposed algorithm still converges.
ASCENT+: Free of charge access to advanced nanoelectronics infrastructure
Creators: name: Cordero, Nicolas
Publisher: name: Zenodo
Year: 2021
Subjects: Compact Modeling
Ascent

description: ASCENT+ mobilises an unprecedented network of knowledge and investment to open access to key European infrastructures and enable academic and industry researchers around the world to address emerging challenges in nanoelectronics and to accelerate innovation path-finding. Building on previous success, and with an additional EU investment of 10M Euro, ASCENT+ brings together 15 partners to make world-class facilities available and to foster the nanoelectronics community. The speakers will present an overview of the ASCENT+ programme, the facilities/technologies on offer, how to get involved and -most important- how to gain access https://www.ascent.network/
Low-temperature electrical resistivity in paramagnetic spinel LiV2O4
Creators: name: Yushankhai, Victor
name: Takimoto, Tetsuya
name: Thalmeier, Peter
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The 3d electron spinel compound LiV2O4 exhibits heavy fermion behaviour below 30K which is related to antiferromagnetic spin fluctuations strongly enhanced in an extended region of momentum space. This mechanism explains enhanced thermodynamic quantities and nearly critical NMR relaxation in the framework of the selfconsistent renormalization (SCR) theory. Here we show that the low-T Fermi liquid behaviour of the resistivity and a deviation from this behavior for higher T may also be understood within that context. We calculate the temperature dependence of the electrical resistivity ρ(T) assuming that two basic mechanisms of the quasiparticle scattering, resulting from impurities and spin-fluctuations, operate simultaneously at low temperature. The calculation is based on the variational principle in the form of a perturbative series expansion for ρ(T). A peculiar behavior of ρ(T) in LiV2O4 is related to properties of low-energy spin fluctuations whose T-dependence is obtained from SCR theory.
description: 10 pages, 3 figures, to appear in Phys. Rev. B
Value of pumped storage systems in British Columbia
Creators: name: Van Groll, Jonathan
Publisher: name: University of British Columbia
Year: 2018

description: The need to establish electricity storage in British Columbia is brought by a regional and global shift towards the development of renewable electricity generation. The integration of renewable sources of power is challenging for system operators due to their inability to be dispatched. Energy storage enables a time lag between generation, transmission, and consumption. The unique characteristics of British Columbia, namely abundance of water and mountainous terrain, are well suited for the development of Pumped Hydro Storage (PHS). The goal of this thesis is to investigate the value of the integration of a PHS plant in the BC Hydro system at a high level of planning. BC Hydro’s Generalized Optimization Model, used for medium to long term planning, was modified to include PHS plants. The benefits of the PHS plant were considered as the incremental increase of the objective function of this optimization model compared to a base case. A method was developed to value PHS plants based on projected benefits and costs. A case study was performed using various configurations of PHS plants; including closed loop plants and one extension of an existing hydropower plant. Sensitivity analysis was performed to test the response of NPV over a number of inputs. As the capacity and storage of the closed loop plants increased, the usage also increased. Benefits were not uniform across the set of water years reflecting the characteristics of each year’s conditions and configuration of the BC Hydro system. The yearly benefit is highest for the extension of the existing hydropower plant. For the closed loop projects, the NPV is highest for the least amount of storage for each capacity. The NPV of all projects was most sensitive to the variation of construction costs. Complete cost recovery of these plants using revenues consisting of trade revenues and increased overall system is unlikely. Additional sources of benefits and revenue streams should be identified and included in future studies of PHS projects. This research can be extended to projects with more certain estimates of characteristics and costs.
Numerical Experiments on the Two-step Emergence of Twisted Magnetic Flux Tubes in the Sun
Creators: name: Toriumi, Shin
name: Yokoyama, Takaaki
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the new results of the two-dimensional numerical experiments on the cross-sectional evolution of a twisted magnetic flux tube rising from the deeper solar convection zone (-20,000 km) to the corona through the surface. The initial depth is ten times deeper than most of previous calculations focusing on the flux emergence from the uppermost convection zone. We find that the evolution is illustrated by the two-step process described below: the initial tube rises due to its buoyancy, subject to aerodynamic drag due to the external flow. Because of the azimuthal component of the magnetic field, the tube maintains its coherency and does not deform to become a vortex roll pair. When the flux tube approaches the photosphere and expands sufficiently, the plasma on the rising tube accumulates to suppress the tube's emergence. Therefore, the flux decelerates and extends horizontally beneath the surface. This new finding owes to our large scale simulation calculating simultaneously the dynamics within the interior as well as above the surface. As the magnetic pressure gradient increases around the surface, magnetic buoyancy instability is triggered locally and, as a result, the flux rises further into the solar corona. We also find that the deceleration occurs at a higher altitude than in our previous experiment using magnetic flux sheets (Toriumi and Yokoyama). By conducting parametric studies, we investigate the conditions for the two-step emergence of the rising flux tube: field strength > 1.5x10^4 G and the twist > 5.0x10^-4 km^-1 at -20,000 km depth.
description: 42 pages, 13 figures, 2 tables, accepted for publication in ApJ. High-resolution figures will appear in the published version
Herschel-SPIRE observations of the disturbed galaxy NGC4438
Creators: name: Cortese, L.
name: Bendo, G. J.
name: Boselli, A.
name: Davies, J. I.
name: Gomez, H. L.
name: Pohlen, M.
name: Auld, R.
name: Baes, M.
name: Bock, J. J.
name: Bradford, M.
name: Buat, V.
name: Castro-Rodriguez, N.
name: Chanial, P.
name: Charlot, S.
name: Ciesla, L.
name: Clements, D. L.
name: Cooray, A.
name: Cormier, D.
name: Dwek, E.
name: Eales, S. A.
name: Elbaz, D.
name: Galametz, M.
name: Galliano, F.
name: Gear, W. K.
name: Glenn, J.
name: Griffin, M.
name: Hony, S.
name: Isaak, K. G.
name: Levenson, L. R.
name: Lu, N.
name: Madden, S.
name: O'Halloran, B.
name: Okumura, K.
name: Oliver, S.
name: Page, M. J.
name: Panuzzo, P.
name: Papageorgiou, A.
name: Parkin, T. J.
name: Perez-Fournon, I.
name: Rangwala, N.
name: Rigby, E. E.
name: Roussel, H.
name: Rykala, A.
name: Sacchi, N.
name: Sauvage, M.
name: Schulz, B.
name: Schirm, M. R. P.
name: Smith, M. W. L.
name: Spinoglio, L.
name: Stevens, J. A.
name: Srinivasan, S.
name: Symeonidis, M.
name: Trichas, M.
name: Vaccari, M.
name: Vigroux, L.
name: Wilson, C. D.
name: Wozniak, H.
name: Wright, G. S.
name: Zeilinger, W. W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present Herschel-SPIRE observations of the perturbed galaxy NGC4438 in the Virgo cluster. These images reveal the presence of extra-planar dust up to ~4-5 kpc away from the galaxy's disk. The dust closely follows the distribution of the stripped atomic and molecular hydrogen, supporting the idea that gas and dust are perturbed in a similar fashion by the cluster environment. Interestingly, the extra-planar dust lacks a warm temperature component when compared to the material still present in the disk, explaining why it was missed by previous far-infrared investigations. Our study provides evidence for dust stripping in clusters of galaxies and illustrates the potential of Herschel data for our understanding of environmental effects on galaxy evolution.
description: 5 pages, 2 figures. Accepted for publication on the A&A Herschel Special Issue
Amalgams of inverse semigroups and reversible two-counter machines
Creators: name: Rodaro, Emanuele
name: Silva, Pedro V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We show that the word problem for an amalgam $[S_1,S_2;U,ω_1,ω_2]$ of inverse semigroups may be undecidable even if we assume $S_1$ and $S_2$ (and therefore $U$) to have finite $\mathcal{R}$-classes and $ω_1,ω_2$ to be computable functions, interrupting a series of positive decidability results on the subject. This is achieved by encoding into an appropriate amalgam of inverse semigroups 2-counter machines with sufficient universality, and relating the nature of certain \sch graphs to sequences of computations in the machine.
Biased transport of elastic cytoskeletal filaments with alternating polarities by molecular motors
Creators: name: Gur, Barak
name: Farago, Oded
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We present a simple model for the bidirectional dynamics of actin bundles with alternating polarities in gliding assays with non-processive myosin motors. In the model, the bundle is represented as an elastic chain consisting of monomers with positive and negative polarities. The motion of the bundle is induced by the pulling forces of the underlying motors which stochastically attach to the monomers and, depending on the polarity of the monomers, pull them in the right or left direction. We demonstrate that perfectly a-polar chains consisting of equal numbers of monomers with positive and negative polarities may exhibit biased bidirectional motion with non-zero drift. This effect is attributed to the elastic tension developed in the chain due to the action of the myosin motors. We also show that as a result of this tension, the attachment probability of the motors is greatly reduced and becomes strongly dependent on the length of the chain. These surprising effects point to the necessity of considering the elasticity of the cytoskeleton in theoretical studies of cooperative dynamics of molecular motors.
description: Accepted for publication in Phys. Rev. Lett.
Interacting fermions on the honeycomb bilayer: from weak to strong coupling
Creators: name: Vafek, Oskar
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Many-body instabilities of the half-filled honeycomb bilayer are studied using weak coupling renormalization group as well as strong coupling expansion. For spinless fermions and assuming parabolic degeneracy, there are 4-independent four-fermion contact couplings. While the dominant instability depends on the microscopic values of the couplings, the broken symmetry state is typically a gapped insulator with either broken inversion symmetry or broken time reversal symmetry, with a quantized anomalous Hall effect. Under certain conditions, the dominant instability may appear in the particle-particle (pairing) channel. For some non-generic fine-tuned initial conditions, weak coupling RG trajectories flow into the non-interacting fixed point, although generally we find runaway flows which we associate with ordering tendencies. Additionally, a tight binding model with nearest neighbor hopping and nearest neighbor repulsion is studied in weak and strong couplings and in each regime a gapped phase with inversion symmetry breaking is found. In the strong coupling limit, the ground state wavefunction is constructed for vanishing in-plane hopping but finite inter-plane hopping, which explicitly displays the broken inversion symmetry and a finite difference between the number of particles on the two layers. Finally, we discuss the spin-1/2 case and use Fierz identities to show that the number of independent 4-fermion contact couplings is 9. The corresponding RG equations in the spin-1/2 case are also presented, and used to show that, just as in strong coupling, the most dominant weak coupling instability of the repulsive Hubbard model (at half-filling) is an anti-ferromagnet.
description: 19 pages, 5 figures
On quantum limit of optical communications: concatenated codes and joint-detection receivers
Creators: name: Guha, Saikat
name: Dutton, Zachary
name: Shapiro, Jeffrey H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: When classical information is sent over a channel with quantum-state modulation alphabet, such as the free-space optical (FSO) channel, attaining the ultimate (Holevo) limit to channel capacity requires the receiver to make joint measurements over long codeword blocks. In recent work, we showed a receiver for a pure-state channel that can attain the ultimate capacity by applying a single-shot optical (unitary) transformation on the received codeword state followed by simultaneous (but separable) projective measurements on the single-modulation-symbol state spaces. In this paper, we study the ultimate tradeoff between photon efficiency and spectral efficiency for the FSO channel. Based on our general results for the pure-state quantum channel, we show some of the first concrete examples of codes and laboratory-realizable joint-detection optical receivers that can achieve fundamentally higher (superadditive) channel capacity than receivers that physically detect each modulation symbol one at a time, as is done by all conventional (coherent or direct-detection) optical receivers.
description: 5 pages, 7 figures, submitted to IEEE International Symposium on Information Theory (ISIT), 2011
Miss Amelia Schellinger's Cottage, 1896
Creators: name: Kelsey, Carleton
name: Amagansett Historical Association
Publisher: name: Unknown
Year: 1896
Subjects: Photographs
Dwellings
Windmills
Structures
Buildings
Schellinger Family

description: This image shows a exterior view of Miss Amelia Schellinger's cottage in 1896. This photograph was either taken or collected by Amagansett historian and librarian Carleton Kelsey.
description: This photograph is part of the collection of the Carleton Kelsey Collection of the Amagansett Historical Association. Kelsey was a local historian and librarian who collected photographs from others to add to the many photographs he took of the community himself.
Effects of Initial Condition and Cloud Density on the Composition of the Grain Mantle
Creators: name: Das, Ankan
name: Acharyya, Kinsuk
name: Chakrabarti, Sandip K.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Evolution of grain mantles in various interstellar environment is studied. We concentrate mainly on water, methanol, carbon di-oxide, which constitute nearly 90% of the grain mantle. We investigate how the production rates of these molecules depend on the relative gas phase abundances of oxygen and carbon monoxide and constrain the relevant parameter space which reproduces these molecules closed to the observed abundances. Allowing to accrete only H, O and CO on the grains and using the Monte-Carlo method we follow the chemical processes for a few million years. We allow formation of multi-layers on the grains and incorporate the freeze-out effects of accreting O and CO. We find that the formation of these molecules depends on the initial conditions as well as the average cloud density. Specifically, when the number density of accreting O is less than 3 times more than that of CO, methanol is always over-produced. Using available reaction pathways it appears to be difficult to match the exact observed abundances of all the three molecules simultaneously. Only in a narrow region of parameter space all these three molecules are produced within the observed limit. In addition to this, we found that the incorporation of the freeze-outs of O and CO leads to almost steady state on the grain surface. The mantle thickness grows anywhere between 60 to 500 layers in a period of two million years. In addition, we consider a case where the gas number density changes with time due to gradual collapse of the molecular cloud and present the evolution of composition of different species as a function of radius of the collapsing cloud.
description: 30 pages, 9 figures
Life cycle and techno-economic assessment of transportation biofuels from hydrothermal liquefaction of forest residues in British Columbia
Creators: name: Nie, Yuhao
Publisher: name: University of British Columbia
Year: 2018

description: Biofuels from hydrothermal liquefaction (HTL) of abundantly available forest residues in British Columbia (BC) can potentially make great contributions to reduce the greenhouse gas (GHG) emissions from the transportation sector. Life cycle and techno-economic assessment are conducted to evaluate the environmental and economic performance of a hypothetic 100 million liters per year (MLPY) HTL biofuel system in the Coast Region of BC based on three different supply chain designs. The life cycle GHG emission of HTL biofuels ranges from 17.0-20.5 g CO₂-eq/MJ, corresponding to 78%-82% reduction compared with petroleum fuels. A further reduction of 6.8 g CO₂-eq/MJ can be achieved when by-product biochar is applied for soil amendment. The conversion stage dominates the total GHG emissions, making up more than 50%. The process emitting most GHGs over the life cycle of HTL biofuels is HTL buffer production. Transportation emissions can be lowered by 83% if forest residues are converted to bio-oil before transportation. Process performance parameters (e.g., HTL energy requirement and biofuel yield) and the location specific parameter (e.g., electricity mix) have significant influence on the GHG emissions of HTL biofuels. The economic analysis shows that the minimum selling price (MSP) of HTL biofuels ranges from $0.82-$0.90 per liter of gasoline equivalent, which is about 63%-80% higher than that of petroleum fuels. Converting forest residues to bio-oil and wood pellets before transportation can significantly lower the variable operating cost but not the MSP of HTL biofuels, due to the considerable increase in capital investment. Bio-oil and biofuel yield can significantly influence the MSP of HTL biofuels. Therefore, technology advancement is needed to bring down the production cost of HTL biofuels, otherwise, a high carbon tax can be applied to make HTL biofuels competitive with petroleum fuels.
Miss Amelia's Cottage, Exterior View
Creators: name: Kelsey, Carleton
name: Amagansett Historical Association
Publisher: name: Unknown
Year: 0
Subjects: Photographs
Dwellings
Structures
Buildings
Schellinger Family

description: This image shows a side exterior view of Miss Amelia Schellinger's cottage and was taken by Betty Schellinger. This photograph was either taken or collected by Amagansett historian and librarian Carleton Kelsey.
description: This photograph is part of the collection of the Carleton Kelsey Collection of the Amagansett Historical Association. Kelsey was a local historian and librarian who collected photographs from others to add to the many photographs he took of the community himself.
Carrier Multiplication in Graphene
Creators: name: Winzer, Torben
name: Knorr, Andreas
name: Malic, Ermin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Graphene as a zero-bandgap semiconductor is an ideal model structure to study the carrier relaxation channels, which are inefficient in conventional semiconductors. In particular, it is of fundamental interest to address the question whether Auger-type processes significantly influence the carrier dynamics in graphene. These scattering channels bridge the valence and conduction band allowing carrier multiplication - a process that generates multiple charge carriers from the absorption of a single photon. This has been suggested in literature for improving the efficiency of solar cells. Here we show, based on microscopic calculations within the density matrix formalism, that Auger processes do play an unusually strong role for the relaxation dynamics of photo-excited charge carriers in graphene. We predict that a considerable carrier multiplication takes place, suggesting graphene as a new material for high-efficiency solar cells and for high-sensitivity photodetectors.
Compact Modeling for the Drain Current of an Extrinsic Organic Field-Effect Transistor Based on an Improved Smoothing Function
Creators: name: Turin, Valentin
Publisher: name: Zenodo
Year: 2021
Subjects: Organic RET
Compact Modeling
SPICE

description: Previously we proposed a new smoothing function to bridge the transition between the linear regime and the saturation regime, for the intrinsic (neglecting the contact resistances) MOSFET. In contrast to the traditional smoothing function, this approach gives a monotonic decrease of the differential conductance from the maximum value in the linear regime to the minimum value in the saturation regime. We also proposed a linear approximation for an extrinsic (accounting for the source and drain resistances) MOSFET drain current dependence on the drain bias in the saturation regime. Finally, by using this approximation and the new smoothing function we developed an extrinsic MOSFET above the threshold drain current compact model. We now use a similar approach for the extrinsic organic field-effect transistor (OFET) compact modeling. First, we proposed an approximate equation for the extrinsic OFET saturation current. Now we present an extrinsic compact model for the above threshold drain current of an OFET based on a new smoothing function, on a new approximate equation for the saturation current and on a new linear approximation for a drain current in the saturation regime. This model takes into account the source and drain resistances and provides a monotonic decrease in the differential conductance with the drain bias rise.
Non-perturbative momentum dependence of the coupling constant and hadronic models
Creators: name: Courtoy, A.
name: Scopetta, S.
name: Vento, V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Models of hadron structure are associated with a hadronic scale which allows by perturbative evolution to calculate observables in the deep inelastic region. The resolution of Dyson-Schwinger equations leads to the freezing of the QCD running coupling (effective charge) in the infrared, which is best understood as a dynamical generation of a gluon mass function, giving rise to a momentum dependence which is free from infrared divergences. We use this new development to understand why perturbative treatments are working reasonably well despite the smallness of the hadronic scale.
description: Changes in Acknowledgments and PACS numbers
Guidelines detailing recommendations and standards for force calibration of testing machines under continuous applications taking into account parasitic influences from multi- component forces and temperature effects
Creators: name: Sander, Jonas
name: Kumme, Rolf
name: Tegtmeier, Falk
name: Knott, Andy
name: Prato, Andrea
name: Germak, Alex
name: De Oliveira, Rafael Soares
name: Hiti, Miha
name: Dizdar, Haldun
name: Aydemir, Bülent
name: Vavrečka, Lukáš
name: Korhonen, Jani
Publisher: name: Zenodo
Year: 2023
Subjects: force calibration
standard
recommendation
continuous force
temperature effect
multicomponent forces
uncertainty
traceability

description: The aim of this work is to develop guidelines for the calibration of material testing machines with continuous
 force under consideration of parasitic influences. The focus is set on influencing quantities that play a
 major role in calibrations with continuous force.
description: The ComTraForce project 18SIB08 has received funding from the European Metrology Programme for Innovation and Research (EMPIR) as well as the European Association of National Metrology Institutes (Euramet).
The Structure of Molecular Clouds: III - A link between cloud structure and star formation mode
Creators: name: Rowles, J.
name: Froebrich, D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyse extinction maps of nearby Giant Molecular Clouds to forge a link between driving processes of turbulence and modes of star formation. Our investigation focuses on cloud structure in the column density range above the self shielding threshold of 1mag Av and below the star formation threshold -- the regime in which turbulence is expected to dominate. We identify clouds with shallow mass distributions as cluster forming. Clouds that form stars in a less clustered or isolated mode show a steeper mass distribution. Structure functions prove inadequate to distinguish between clouds of different star formation mode. They may, however, suggest that the turbulence in the average cloud is governed by solenoidal forcing. The same is found using the Delta-variance analysis which also indicates that clouds with a clustered mode of star formation show an enhanced component of compressive driving in the turbulent field. Thus, while star formation occurs in each cloud, independent of the turbulent driving mechanism, compressive forcing appears to be associated with the formation of stellar clusters.
description: 10 pages, 3 figures, 2 tables, accepted for publication by MNRAS, a version with higher resolution figures can be found at http://astro.kent.ac.uk/~df/
Towards More Accessible Scientific PDFs for People with Visual Impairments: Step-by-Step PDF Remediation to Improve Tag Accuracy
Creators: name: Schmitt-Koopmann, Felix M.
name: Huang, Elaine M.
name: Hutter, Hans-Peter
name: Darvishy, Alireza
Publisher: name: arXiv
Year: 2025
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: PDF inaccessibility is an ongoing challenge that hinders individuals with visual impairments from reading and navigating PDFs using screen readers. This paper presents a step-by-step process for both novice and experienced users to create accessible PDF documents, including an approach for creating alternative text for mathematical formulas without expert knowledge. In a study involving nineteen participants, we evaluated our prototype PAVE 2.0 by comparing it against Adobe Acrobat Pro, the existing standard for remediating PDFs. Our study shows that experienced users improved their tagging scores from 42.0% to 80.1%, and novice users from 39.2% to 75.2% with PAVE 2.0. Overall, fifteen participants stated that they would prefer to use PAVE 2.0 in the future, and all participants would recommend it for novice users. Our work demonstrates PAVE 2.0's potential for increasing PDF accessibility for people with visual impairments and highlights remaining challenges.
Rational points on curves
Creators: name: Stoll, Michael
Publisher: name: arXiv
Year: 2010
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: Primary 11D41, Secondary 11G30, 14G05, 14G25

description: This is an extended version of an invited lecture I gave at the Journees Arithmetiques in St. Etienne in July 2009. We discuss the state of the art regarding the problem of finding the set of rational points on a (smooth projective) geometrically integral curve C over Q. The focus is on practical aspects of this problem in the case that the genus of C is at least 2, and therefore the set of rational points is finite.
description: 21 pages
PSP103.8 MOSFET model : improvement of the charge model for short channel transistors
Creators: name: O. Rozeau
Publisher: name: Zenodo
Year: 2021
Subjects: PSP
Compact Modeling
SPICE

description: PSP is a well-known surface potential based model for deep-submicron bulk MOSFET. Initially, PSP model was grounded from MOS Model 11 (from NXP Semiconductors) and SP (from Pennsylvania State University and later at Arizona State University). In December 2005, PSP has been elected a new industrial standard model by the Compact Model Council (CMC). Since 2015, this model is jointly developed by NXP Semiconductors and CEA-Leti. In this presentation, we propose an overview of recent PSP versions with a focus on the latest developments about the charge model. The most recent version is PSP103.8. In this version, new models of the inner fringe charges and the inversion of overlaps have been introduced to improve the accuracy of the model for short channel transistors. These models were developed thanks to rigorous analysis of TCAD simulations detailed in this presentation. Experimental data will be use to validate this new PSP version and to estimate the increase of the model accuracy.
SbnI is a free serine kinase and heme-sensing regulator required for staphyloferrin B biosynthesis in Staphylococcus aureus
Creators: name: Verstraete, Meghan Marie
Publisher: name: University of British Columbia
Year: 2019

description: Staphylococcus aureus is a common member of the human microbiome, but is an opportunistic pathogen that can cause a variety of infections. Critical to the growth and survival of S. aureus during infection is acquisition of iron from the host. However, host iron availability is restricted to effectively suppress microbial growth as a type of innate, nutritional immunity. Mechanisms used by S. aureus to access the host iron pool include lysing erythrocytes to liberate hemoglobin for heme uptake and through the secretion of staphyloferrins, which are iron-chelating siderophores to scavenge iron from the host. The multiplicity of iron uptake systems S. aureus possesses is likely a reflection of the varied host environments that S. aureus can colonize or infect. However, the spatiotemporal regulatory mechanisms by which S. aureus adapts to changing iron availability over the course of infection are ill-defined. SbnI is a heme-dependent regulator of staphyloferrin B (SB) biosynthesis suggested to mediate between iron-uptake modes. In this thesis, study of the structure SbnI revealed homology to a free L-serine kinase, SerK, from Thermococcus kodakarensis. Biochemical assays and characterization of a serC mutant of S. aureus showed that SbnI is an ATP dependent L-serine kinase required for production of the SB precursor O-phospho-L-serine. SbnI kinase activity enables SB biosynthesis in environments where S. aureus catabolism is primarily reliant on amino acids, as in abscesses. Characterization of heme binding by SbnI and heme transfer reactions with IsdI and IsdG, two heme degrading enzymes, were used to construct a model of heme-binding by SbnI for regulating heme-SB uptake. This model is consistent with a modest effect of heme-binding on SbnI kinase activity. Heme transfer rates were measured from ChdC, the terminal enzyme in heme biosynthesis, to SbnI, IsdG, and IsdI to delineate an intracellular network of heme sensing and trafficking proteins that are likely required for regulation and adaptation to the dynamic host environment.
Comment on "Evaluation of kinetic freeze-out properties in different relativistic heavy-ion collision systems at \sqrtsNN = 200 GeV'' (Eur. Phys. J. Plus (2025) 140:179) https://doi.org/10.1140/epjp/s13360-025-06119-0
Creators: name: Ashraf, M. U.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The comment raises serious concerns regarding the authors claims about the phase transition from the QGP phase to the hadron gas phase. Additionally, the comment critiques the fundamental distinction between the kinetic freeze-out temperature and the critical temperature, as the authors erroneously treat them as identical in their article. The authors also assert that the critical temperature is system dependent which contradicts established lattice QCD calculations. Furthermore, there are flaws in their handling of data uncertainties, which could significantly affect the quality of the fit. Furthermore, they misrepresent AMPT-simulated data as experimental data, which undermines the validity of their analysis. Flaws in their handling of data uncertainties also cast doubt on the robustness of their fits.
description: 2 pages
title: Eglise Saint-Jean d'Abbetot 14
Creators: name: Delamare, Ségolène
name: Trajectoires UMR 8215
Publisher: name: Archeovision
Year: 2023
Subjects: subject: archéologie du bâti
subject: photogrammétrie
subject: escalier
subject: Numérisation 3D
subject: Archéologie médiévale
subject: Histoire de l'art médiéval

description: Eglise romane
description: 13 fichiers 3D (ply), 1300 fichiers image (jpg), 609 fichiers unknown (CR2)
Horizontal Branch evolution, metallicity and sdB stars
Creators: name: Michaud, G.
name: Richer, J.
name: Richard, O.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Abundance anomalies have been observed in field sdB stars and in nearly all Horizontal Branch (HB) stars of globular clusters with Teff > 11 000K whatever be the cluster metallicity. Aims. The aim is to determine the abundance variations to be expected in sdB stars and in HB stars of metallicities Z \geq 0.0001 and what observed abundances teach us about hydrodynamical processes competing with atomic diffusion. Methods. Complete stellar evolution models, including the effects of atomic diffusion and radiative acceleration, have been computed from the zero age main-sequence for metallicities of Z0 = 0.0001, 0.001, 0.004 and 0.02. On the HB the masses were selected to cover the Teff interval from 7000 to 37000K. Some 60 evolutionary HB models were calculated. The calculations of surface abundance anomalies during the horizontal branch depend on one parameter, the surface mixed mass. Results. For sdB stars with Teff < 37000K and for HB stars with Teff > 11 000K in all observed clusters, independent of metallicity, it was found that most observed abundance anomalies (even up to ~ x 200) were compatible, within error bars, with expected abundances. A mixed mass of ~1.E-7 M\odot was determined by comparison with observations. Conclusions. Observations of globular cluster HB stars with Teff > 11 000K and of sdB stars with Teff < 37 000K suggest that most observed abundance anomalies can be explained by element separation driven by radiative acceleration occuring at a mass fraction of ~1.E-7 M\odot. Mass loss or turbulence appear to limit the separation between 1.E-7 M\odot and the surface.
description: Accepted for publication by A&A
Penrose Process in Kerr-Taub-NUT Spacetime
Creators: name: Abdujabbarov, A. A.
name: Ahmedov, B. J.
name: Shaymatov, S. R.
name: Rakhmatov, A. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Penrose process on rotational energy extraction of the black hole in the Kerr-Taub-NUT spacetime is studied. It has been shown that for the radial motion of particles NUT parameter slightly shifts the shape of the effective potential down. The dependence of the extracted energy from compact object on NUT parameter has been found.
description: 7 pages, 6 figures, Accepted for publication in Astrophysics & Space Science
Intervention analysis with state-space models to estimate discontinuities due to a survey redesign
Creators: name: Brakel, Jan van den
name: Roels, Joeri
Publisher: name: arXiv
Year: 2010
Subjects: subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: An important quality aspect of official statistics produced by national statistical institutes is comparability over time. To maintain uninterrupted time series, surveys conducted by national statistical institutes are often kept unchanged as long as possible. To improve the quality or efficiency of a survey process, however, it remains inevitable to adjust methods or redesign this process from time to time. Adjustments in the survey process generally affect survey characteristics such as response bias and therefore have a systematic effect on the parameter estimates of a sample survey. Therefore, it is important that the effects of a survey redesign on the estimated series are explained and quantified. In this paper a structural time series model is applied to estimate discontinuities in series of the Dutch survey on social participation and environmental consciousness due to a redesign of the underlying survey process.
description: Published in at http://dx.doi.org/10.1214/09-AOAS305 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
title: Die Entwicklung und Anwendung konfliktspezifischer Geschichtenergänzungsaufgaben als Teil der OPD-Diagnostik im Kindesalter
Creators: name: König, Franziska
name: Benecke, Cord
Publisher: name: Universität Kassel
Year: 2020
Subjects: subject: OPD-KJ-2
subject: Geschichtenergänzungsaufgaben
subject: Diagnostik Altersgruppe 2 (6-12 Jahre)
subject: Konfliktachse
subject: Strukturachse
subject: OPD-CA-2
subject: story completion tasks
subject: diagnostics of Age Group 2 (6-12 years)
subject: conflict axis
subject: structure axis
subject: 150
subject: OPD-KJ-2
subject: Diagnostik
subject: Kind
subject: Jugend
subject: Psychischer Konflikt
subject: Fragebogen

description: Gefördert im Rahmen eines Open-Access-Transformationsvertrags mit dem Verlag
Non-perturbative renormalization in lattice QCD
Creators: name: Aoki, Yasumichi
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recent developments in non-perturbative renormalization for lattice QCD are reviewed with a particular emphasis on RI/MOM scheme and its variants, RI/SMOM schemes. Summary of recent developments in Schroedinger functional scheme, as well as the summary of related topics are presented. Comparison of strong coupling constant and the strange quark mass from various methods are made.
description: 20 pages, 10 figures, Plenary talk at 27th International Symposium on Lattice Field Theory (Lattice 2009), Beijing, China, 25-31 Jul 2009.
Analytical Modeling of Double Channel GaN HEMTs
Creators: name: Sheikh Aamir Ahsan
Publisher: name: Zenodo
Year: 2021

description: In this work, we report the development of a new physics-based analytical model for current and charge characteristics of Double Channel (DC) Gallium Nitride High Electron Mobility Transistors (GaN-HEMTs). The model has at its core the self-consistent calculation of the charge densities, for both upper and lower channels, obtained from a solution of the Schrodinger and Poisson equations. Fermi-Dirac (FD) distribution together with 2D density of states is used for mobile carrier statistics in both the channels. Furthermore, drift-diffusion transport is used to compute the channel current using charge densities at channel extremities. Finally, the model is validated against TCAD simulation and experimental data for a DC-GaN-HEMT. The model, by virtue of its fully physics-based nature, precisely captures the charge screening effect in the lower channel without invoking any empirical clamping functions, unlike prior models, and also possesses the feature of being geometrically scalable.
Proceedings Seventh Workshop on Structural Operational Semantics
Creators: name: Aceto, Luca
name: Sobociński, Paweł
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Structural operational semantics (SOS) is a technique for defining operational semantics for programming and specification languages. Because of its intuitive appeal and flexibility, SOS has found considerable application in the study of the semantics of concurrent processes. It is also a viable alternative to denotational semantics in the static analysis of programs and in proving compiler correctness. Recently it has been applied in emerging areas such as probabilistic systems and systems biology.
AUDITORY-VISUAL SCENES REPOSITORY: HOW TO USE THE PROVIDED ENVIRONMENTS
Creators: name: Llorca-Bofí, Josep
name: Vorländer, Michael
name: Van De Par, Steven
Publisher: name: Zenodo
Year: 2021

description: This document defines the main guidelines on how to use the provided environments. The document provides guidance for recreating an audiovisual environment available at this repository, which are suitable for hearing research and which can be published in this repository.