cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Herschel/HIFI observation of highly excited rotational lines of HNC toward IRC +10 216
Creators: name: Daniel, F.
name: Agúndez, M.
name: Cernicharo, J.
name: De Beck, E.
name: Lombaert, R.
name: Decin, L.
name: Kahane, C.
name: Guélin, M.
name: Müller, H. S. P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report the detection in emission of various highly excited rotational transitions of HNC (J = 6-5 through J =12-11) toward the carbon-star envelope IRC +10 216 using the HIFI instrument on-board the Herschel Space Observatory. Observations of the J = 1-0 and J = 3-2 lines of HNC with the IRAM 30-m telescope are also presented. The lines observed with HIFI have upper level energies corresponding to temperatures between 90 and 340 degrees Kelvin, and trace a warm and smaller circumstellar region than that seen in the interferometric maps of the J = 1-0 transition, whose emission extends up to a radius of 20". After a detailed chemical and radiative transfer modeling, we find that the presence of HNC in the circumstellar envelope of IRC +10 216 is consistent with formation from the precursor ion HCNH+, which in turn is produced through several proton transfer reactions which are triggered by the cosmic-ray ionization. We also find that the radiative pumping through 21 um photons to the first excited state of the bending mode v2 plays a crucial role to populate the high-J HNC levels involved in the transitions observed with HIFI. Emission in these high-J rotational transitions of HNC is expected to be strong in regions which are warm and dense and/or have an intense infrared flux at wavelengths around 21 um.
Measuring Higgs Couplings from LHC Data
Creators: name: Klute, Markus
name: Lafaye, Remi
name: Plehn, Tilman
name: Rauch, Michael
name: Zerwas, Dirk
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Following recent ATLAS and CMS publications we interpret the results of their Higgs searches in terms of Standard Model operators. For a Higgs mass of 125 GeV we determine several Higgs couplings from 2011 data and extrapolate the results towards different scenarios of LHC running. Even though our analysis is limited by low statistics we already derive meaningful constraints on modified Higgs sectors.
description: 5 pages, 4 figures
Grazing effects and resource use by large herbivores in arid and semi-arid rangelands
Advancements of analysis through high resolution spatio-temporalliy dynamic modelling
Creators: name: Fust, Pascal
Publisher: name: Universität Kassel
Year: 2022
Subjects: subject: dynamic spatial modelling
subject: natural ressource management
subject: herbivore ecology
subject: rangeland modelling
subject: agent-based modelling
subject: animal movement ecology
subject: climate change effect
subject: 630
subject: Vegetation
subject: Weideland
subject: Bewirtschaftung
subject: Natürliche Ressourcen
subject: Nutztierhaltung
subject: Klimaschwankung

description: Zugleich: Dissertation, Universität Kassel, 2022
The role of p75NTR in axonal regeneration and intraspinal plasticity following spinal deafferentation
Creators: name: Scott, Angela Lee
Publisher: name: University of British Columbia
Year: 2009

description: Following spinal cord injury (SCI), functional recovery is extremely limited in adult mammals. This lack of recovery is reflective of the failure of axons to regenerate and the incapacity of uninjured neurons to compensate for the lost connections. In animal models of SCI, the administration of neurotrophic factors such as neurotrophins promotes both the regeneration and sprouting of injured and uninjured axons. Neurotrophins elicit these growth-promoting effects through tropomyosin-related kinase (Trk) receptors. However, neurotrophins also interact with a pan neurotrophin receptor, p75NTR. Several functions of the p75NTR receptor have been reported, but its role in neurotrophin-mediated signalling following SCI remains unclear. To determine the role of p75NTR in neurotrophin-mediated axonal regeneration and sprouting within the CNS, I assessed anatomical changes and functional outcomes following spinal deafferentation in mice lacking the neurotrophin-binding domain of p75NTR (p75-/-) and in wild-type littermates (p75+/+). Regeneration of sensory axons was significantly greater in p75-/- mice, and resulted in functional re-connection with dorsal horn neurons. Axonal regeneration in the p75-/- mice was neurotrophin-dependent, and dis-inhibited by the absence of p75NTR expression on glial cells following injury. These findings indicate that glial expression of p75NTR restricts neurotrophin availability to the extent that it prevents spontaneous sensory axon regeneration into the spinal cord. Intraspinal sprouting of uninjured neuronal processes following dorsal root injury was also evaluated in p75+/+ and p75-/- mice. The density of sprouting axons was significantly enhanced by the application of exogenous neurotrophins and dis-inhibited by the absence of p75NTR. Dendritic density was also promoted by exogenous neurotrophin treatment, but was not affected by the absence of p75NTR. Together, these results demonstrate that p75NTR restricts the intraspinal sprouting of neurotrophin-responsive axons, but not dendrites, within the injured spinal cord. Dis-inhibition of dendritic plasticity was, however, correlated to the antagonism of truncated TrkB receptor (TrkBT1) expression. Thus, the neurotrophin receptors p75NTR and TrkBT1 may differentially inhibit intraspinal sprouting of pre- and post-synaptic processes within the spinal cord following injury.
The Potential for public transit in the commuter-shed areas of Calgary and Edmonton
Creators: name: Brander, Robert Bruce
Publisher: name: Engineering
Year: 1978
Subjects: subject: HE 311 C22 C2138 1978 Microfiche
subject: Urban transportation - Alberta - Calgary
subject: Urban transportation - Alberta - Edmonton
subject: Local transit - Alberta - Calgary
subject: Local transit - Alberta - Edmonton

description: Bibliography: p. 208-212.
Spatial assessment of forest fire smoke exposure and its health impacts in Southeastern British Columbia during the summer of 2003
Creators: name: Henderson, Sarah B.
Publisher: name: University of British Columbia
Year: 2009

description: Forest fires are a significant source of episodic air pollution resulting in elevated ambient concentrations of inhalable particulate matter (PM). Although PM from fossil fuel combustion has been conclusively associated with respiratory and cardiovascular morbidity and mortality, the health effects of fire-related PM are not clearly understood. Air quality monitoring is sparse in many fire-affected areas, so it is challenging to apply epidemiologic methods that require individual-level exposure assessment. Data from dispersion models and remote sensors are spatially extensive and may provide viable exposure estimation alternatives. Firestorms across southeastern British Columbia during the summer of 2003 produced a unique opportunity to compare rigorous epidemiologic results based on new exposure assessment methods to those based on air quality monitoring data. A population-based cohort of ~280 000 subjects was identified from administrative health data and three daily smoke exposure estimates were assigned for each individual according to residential location: TEOM averaged PM concentrations measured by the nearest of six air quality monitors; SMOKE indicated the presence of a plume over the area in satellite imagery; and CALPUFF averaged PM concentrations estimated by a dispersion model. The latter was initialized and run for this project using remote sensing data to simplify the model as much as possible. For example, emissions were calculated with the radiative power of satellite-detected fires and were comparable to those estimated by much more complex methods. Overall performance of the model was moderate when evaluated using PM measurements, satellite imagery and atmospheric aerosol measurements. Longitudinal logistic regression was used to examine the independent effects of each exposure over the 92-day study period. Respiratory outcomes were associated with smoke-related PM, but no cardiovascular effects were detected. While odds ratios for the TEOM metric were consistent with other reports, those for the CALPUFF metric were biased towards the null. Results for SMOKE tracked with those for TEOM, but with much wider confidence intervals. This study (1) highlights the potential of new smoke exposure assessment methods, (2) demonstrates that plume dispersion models can be simplified with remote sensing data, and (3) confirms the respiratory health effects of forest fire smoke.
Influence of perpendicular magnetic fields on the domain structure of permalloy microstructures grown on thin membranes
Creators: name: Dietrich, Christian
name: Hertel, R.
name: Huber, Michael
name: Weiss, Dieter
name: Schäfer, R.
name: Zweck, Josef
Publisher: name: Universität Regensburg
Year: 2008
Subjects: subject: 530 Physik

description: Unlike the broadly studied influence of the in-plane magnetic fields on magnetic domain structures in thin-film elements, not much is known to date, on the changes of the domain structure driven by external magnetic fields applied perpendicular to the plane. Using high-resolution transmission electron microscopy studies combined with micromagnetic modeling, we investigated the effect of static, strong perpendicular fields on square and disk-shaped mesoscopic permalloy elements with a vortex flux-closure magnetization structure. In the case of square elements, we discovered an unexpected, pronounced, and reversible bending of the 90° domain walls, which increases with the field strength and changes direction when the field direction is reversed. By means of micromagnetic simulations and atomic force microscopy studies, we demonstrate that this effect is connected with the minute curvatures of the sample surface. The slight curvature arises from surface tensions in the membrane on which the microstructures are fabricated.
Coping with rapid and cascading changes in Svalbard: the case of nature-based tourism
Creators: name: Dannevig, Halvor
name: Søreide, Janne
name: Sveinsdottír, Anna
Publisher: name: Zenodo
Year: 2023
Subjects: svalbard
climate change
torusim

description: Tourism has been booming in Svalbard, and has picked up where it left before the pandemic. At the same time, the island is a hotspot of rapid and cascading climate and environmental changes, already putting natural and social systems under stress. There is more snow, less sea-ice and glaciers are retreating at an increasingly faster rate. At the same time, sweeping legislative changes for Svalbard is underway, which held the potential for changing the conditions for tourism in multiple ways. Drawing on an assessment of recent projections for climate and environmental change, as well as interviews with tourism actors, this article outlines how climate and environmental changes is currently impacting nature-based tourism actors in the archipelago and discusses opportunities and barriers for tourist actors adaptation to current and projected changes. It finds that tourism actors have high adaptive capacity to projected changes, taking advantage of increased access due to shrinking ice in the fjords, and extending the summer season into the autumn month due to higher temperatures. At the same time are avalanches and other natural hazard risk increasing, causing a higher frequency of disruptions of planned tours and excursions.
Warped branches of flux compactifications
Creators: name: Lim, Yen-Kheng
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider Freund-Rubin-type compactifications which are described by (p+q)-dimensional Einstein gravity with a positive cosmological constant and a q-form flux. Using perturbative expansions of Kinoshita's ansatz for warped dS_pxS^q and AdS_pxS^q spacetimes, we obtain analytical solutions describing the warped branches and their respective phase spaces. These equations are given by inhomogeneous Gegenbauer differential equations which can be solved by the Green's function method. The requirement that the Green's functions are regular provides constraints which determine the structure of the phase space of the warped branches. We apply the perturbation results to calculate the thermodynamic variables for the warped dS_pxS^q branch. In particular, the first law of thermodynamics can be reproduced using this method.
description: 25 pages, 2 figures
Technical guidelines for using CP4-Africa simulation data
Creators: name: Senior, Catherine
name: Finney, Declan
name: Owiti, Zablone
name: Rowell, Dave
name: Marsham, John
name: Jackson, Lawrence
name: Berthou, Segolene
name: Kendon, Elizabeth
name: Misiani, Herbert
Publisher: name: Zenodo
Year: 2020
Subjects: Africa
Climate modelling
convection
climate change
climate science

description: This guide provides a practical overview of the first pan-African, kilometre-scale convection-permitting regional climate simulations (CP4-Africa), run as part of the Future Climate for Africa (FCFA) programme’s Improving Model Processes for African Climate (IMPALA) project. CP4-Africa provides the first convection-permitting resolution, multi-year climate simulations for present-day and idealised future climates on an African-wide domain. The simulations have provided an unprecedented level of climate detail across Africa and initial studies have shown improvements in the simulation of many, but not all, aspects of African climate. The goal of this guide is to promote adoption of the CP4-Africa approach within the climate community and is targeted at researchers with interest in progressing this relatively new modelling approach to improve understanding and representation of the drivers of African climate. It is also targeted at potential users of the high-resolution simulations for impact studies and decision support. While this is not an exhaustive review of the CP4-Africa simulations, from a practical perspective it highlights what one has to be aware of when designing similar simulations or using CP4-Africa simulation outputs. The guide is envisaged to be a living document that will be updated as new experiences become available from further analysis of CP4-Africa simulations data; and running CP4-Africa simulations under different experimental set ups. The guide is structured as a series of questions on CP4-Africa simulations and the application of the results, including how to access the simulations’ data. It begins with background information on what convection-permitting models are. A description of the CP4-Africa simulations performed by the IMPALA project is then presented. This is followed by an illustration of what is new in the CP4-Africa regional climate simulations, its limitations and how the simulations’ data can be accessed. Finally, case studies on user experiences in accessing and using CP4-Africa simulation are presented.
Comment on "Deterministic six states protocol for quantum communication" [Phys. Lett. A 358 (2006) 85]
Creators: name: El-Orany, Faisal A. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In [J.S. Shaari, M. Lucamarini, M.R.B. Wahiddin, Phys. Lett. A 358 (2006) 85-90] the deterministic six states protocol (6DP) for quantum communication has been developed. This protocol is based on three mutually unbiased bases and four encoding operators. Information is transmitted between the users via two qubits from different bases. Three attacks have been studied; namely intercept-resend attack (IRA), double-CNOT attack (2CNOTA) and quantum man-in-the-middle attack. In this Letter, we show that the IRA and 2CNOTA are not properly addressed. For instance, we show that the probability of detecting Eve in the control mode of the IRA is 70% instead of 50% in the previous study. Moreover, in the 2CNOTA, Eve can only obtain 50% of the data not all of it as argued earlier.
description: 7 pages, 2 figures
Magnetic Towers and Binary-Formed Disks: New Results for PN Evolution
Creators: name: Huarte-Espinosa, Martín
name: Frank, Adam
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present new results of 3-D AMR MHD simulations focusing on two distinct aspects of PPN evolution. We first report new simulations of collimated outflows driven entirely by magnetic fields. These Poynting flux dominated "magnetic towers" hold promise for explaining key properties of PPN flows. Our simulations address magnetic tower evolution and stability. We also present results of a campaign of simulations to explore the development of accretion disks formed via wind capture. Our result focus on the limits of disk formation and the range of disk properties.
description: 4 pages, 2 figures, to appear in the proceedings of the IAU Symposium 283 "Planetary Nebulae, an Eye to the Future", Puerto de la Cruz, Tenerife, Spain
Linear non-hysteretic gating of a very high density 2DEG in an undoped metal-semiconductor-metal sandwich structure
Creators: name: Gupta, K. Das
name: Croxall, A. F.
name: Mak, W. Y.
name: Beere, H. E.
name: Nicoll, C. A.
name: Farrer, I.
name: Sfigakis, F.
name: Ritchie, D. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Modulation doped GaAs-AlGaAs quantum well based structures are usually used to achieve very high mobility 2-dimensional electron (or hole) gases. Usually high mobilities ($>10^{7}{\rm{cm}^{2}\rm{V}^{-1}\rm{s}^{-1}}$) are achieved at high densities. A loss of linear gateability is often associated with the highest mobilites, on account of a some residual hopping or parallel conduction in the doped regions. We have developed a method of using fully undoped GaAs-AlGaAs quantum wells, where densities $\approx{6\times10^{11}\rm{cm}^{-2}}$ can be achieved while maintaining fully linear and non-hysteretic gateability. We use these devices to understand the possible mobility limiting mechanisms at very high densities.
description: 4 pages, 3 eps figures
Using inventory based field attributes to characterize carbon stocks and carbon stock changes within eddy-flux covariance tower footprints
Creators: name: Ferster, Colin Jay
Publisher: name: University of British Columbia
Year: 2009

description: Forests are an important part of the global carbon (C) cycle, and understanding and quantifying forest C dynamics is necessary for informed forest management decisions and accurate C budget accounting. This thesis contributes to the understanding of forest C dynamics by comparing biometric measurements of C stock changes (ΔC) and eddy covariance (EC) flux-tower measurements of cumulative net ecosystem productivity (ΣNEP) at three sites at the Fluxnet Canada Research Network British Columbia Flux Station; a young (near-end-of-rotation) forest established in 1949 (DF1949), a pole sapling stand established in 1988 (HDF1988), and a recent clearcut established in 2000 (HDF2000). To address spatial variability in stand and tower footprint conditions, first, light detection and ranging (lidar) remote sensing data were used to quantify large tree and snag aboveground mass (TSAM) at DF1949 (r²=0.75, SEE=29.68 Mg/ha). Next, for all three sites, remote sensing estimates were combined with advanced GIS data to estimate the spatial distribution of C stocks that are more difficult to measure directly using only remote sensing data. The resulting spatial representation of forest structure was combined with published EC flux-tower footprint probability distributions to enable a comparison between biometric ΔC stocks and tower ΣNEP. Where biometric ΔC stocks were difficult to resolve, changes were modeled using parameters from the Carbon Budget Model of the Canadian Forest Sector (CBM-CFS3). The best agreement between biometric ΔC stocks and tower ΣNEP was at DF1949 (mean = 15.18 ± 7.94 MgC/ha/4 years ΔC; 13.63 MgC/ha/4 years ΣNEP). The other two sites followed the same rank but had larger divergences and differences of sign (HDF1988: mean = 11.52 ± 1.17 MgC/ha/4 years ΔC and -1.93 MgC/ha/4 years ΣNEP; HDF2000: 3.59 ± 1.59 MgC/ha/4 years ΔC and -20.08 MgC/ha/4 years ΣNEP). An unaccounted source of respiration at the more recently disturbed sites may be related to stump, coarse root, and logging-slash decomposition. This study develops an approach and methodology that may be applied at other EC flux-tower sites where researchers wish to compare biometric-based measurements with micrometeorological-based measurements.
Persistence of a Brownian particle in a Time Dependent Potential
Creators: name: Chakraborty, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the persistence probability of a Brownian particle in a harmonic potential, which decays to zero at long times -- leading to an unbounded motion of the Brownian particle. We consider two functional forms for the decay of the confinement, an exponential and an algebraic decay. Analytical calculations and numerical simulations show, that for the case of the exponential relaxation, the dynamics of Brownian particle at short and long times are independent of the parameters of the relaxation. On the contrary, for the algebraic decay of the confinement, the dynamics at long times is determined by the exponent of the decay. Finally, using the two-time correlation function for the position of the Brownian particle, we construct the persistence probability for the Brownian walker in such a scenario.
description: 7 pages, 5 figures, Accepted for publication in Phys. Rev. E
The frequency of giant planets around metal-poor stars
Creators: name: Mortier, A.
name: Santos, N. C.
name: Sozzetti, A.
name: Mayor, M.
name: Latham, D.
name: Bonfils, X.
name: Udry, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Context. The discovery of about 700 extrasolar planets, so far, has lead to the first statistics concerning extrasolar planets. The presence of giant planets seems to depend on stellar metallicity and mass. For example, they are more frequent around metal-rich stars,with an exponential increase in planet occurrence rates with metallicity. Aims. We analyzed two samples of metal-poor stars (-2.0 \leq [Fe/H] \leq 0.0) to see if giant planets are indeed rare around these objects. Radial velocity datasets were obtained with two different spectrographs (HARPS and HIRES). Detection limits for these data,expressed in minimum planetary mass and period, are calculated. These produce trustworthy numbers for the planet frequency. Methods. A general Lomb Scargle (GLS) periodogram analysis was used together with a bootstrapping method to produce the detection limits. Planet frequencies were calculated based on a binomial distribution function within metallicity bins. Results. Almost all hot Jupiters and most giant planets should have been found in these data. Hot Jupiters around metal-poor stars have a frequency lower than 1.0% at one sigma. Giant planets with periods up to 1800 days, however, have a higher frequency of $f_p = 2.63^{+2.5}_{-0.8}%$. Taking into account the different metallicities of the stars, we show that giant planets appear to be very frequent $(f_p = 4.48^{+4.04}_{-1.38}%)$ around stars with [Fe/H] > -0.7, while they are rare around stars with [Fe/H] \leq -0.7 (\leq 2.36% at one sigma). Conclusions. Giant planet frequency is indeed a strong function of metallicity, even in the low-metallicity tail. However, the frequencies are most likely higher than previously thought.
description: Accepted to A&A, 8 pages, 6 figures, 2 tables
Lagrangian chaos in an ABC--forced nonlinear dynamo
Creators: name: Rempel, Erico L.
name: Chian, Abraham C. -L.
name: Brandenburg, Axel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The Lagrangian properties of the velocity field in a magnetized fluid are studied using three-dimensional simulations of a helical magnetohydrodynamic dynamo. We compute the attracting and repelling Lagrangian coherent structures, which are dynamic lines and surfaces in the velocity field that delineate particle transport in flows with chaotic streamlines and act as transport barriers. Two dynamo regimes are explored, one with a robust coherent mean magnetic field and one with intermittent bursts of magnetic energy. The Lagrangian coherent structures and the statistics of finite--time Lyapunov exponents indicate that the stirring/mixing properties of the velocity field decay as a linear function of the magnetic energy. The relevance of this study for the solar dynamo problem is discussed.
On positive solutions and the Omega limit set for a class of delay differential equations
Creators: name: Zhuge, Changjing
name: Sun, Xiaojuan
name: Lei, Jinzhi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 34K90, 92D25

description: This paper studies the positive solutions of a class of delay differential equations with two delays. These equations originate from the modeling of hematopoietic cell populations. We give a sufficient condition on the initial function for $t\leq 0$ such that the solution is positive for all time $t>0$. The condition is "optimal". We also discuss the long time behavior of these positive solutions through a dynamical system on the space of continuous functions. We give a characteristic description of the $ω$ limit set of this dynamical system, which can provide informations about the long time behavior of positive solutions of the delay differential equation.
description: 15 pages, 2 figures
Global Properties of Solar Flares
Creators: name: Hudson, Hugh S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This article broadly reviews our knowledge of solar flares. There is a particular focus on their global properties, as opposed to the microphysics such as that needed for magnetic reconnection or particle acceleration as such. Indeed solar flares will always remain in the domain of remote sensing, so we cannot observe the microscales directly and must understand the basic physics entirely via the global properties plus theoretical inference. The global observables include the general energetics -radiation in flares and mass loss in coronal mass ejections (CMEs) - and the formation of different kinds of ejection and global wave disturbance: the type II radio-burst exciter, the Moreton wave, the EIT "wave," and the "sunquake" acoustic waves in the solar interior. Flare radiation and CME kinetic energy can have comparable magnitudes, of order 10^32 erg each for an X-class event, with the bulk of the radiant energy in the visible-UV continuum. We argue that the impulsive phase of the flare dominates the energetics of all of these manifestations, and also point out that energy and momentum in this phase largely reside in the electromagnetic field, not in the observable plasma
The Effectiveness of two computer assisted instruction presentations in mathematics to slow learners
Creators: name: Grant, Wayne
Publisher: name: University of Calgary
Year: 1977
Subjects: subject: QA 135.5 G73 1977 Microfiche
subject: Mathematics - Study and teaching
subject: Mathematics - Computer-assisted instruction
subject: Slow learning children - Programmed instruction

description: Bibliography: p. 87-91.
LAPAROSCOPIC CHOLECYSTECTOMY AFTER VENTICULOPERITONEAL SHUNT: CASE REPORT AND REVIEW OF THE LITERATURE
Creators: name: Helic, Bakir
name: Sakic, Almir
name: Dzambic, Nermin
Publisher: name: figshare
Year: 2020
Subjects: subject: 110323 Surgery
subject: FOS: Clinical medicine

description: Prevalence of gallstone disease around the world varies, but elective cholecystectomy is the most
frequently performed elective abdominal procedure in the world with more than 750.000
procedures per year only in the USA, most of them preformed laparoscopically. Laparoscopic
cholecystectomy after ventriculoperitoneal shunt creation was considered dangerous and open
cholecystectomy was indicated if surgery was required, but opinions are changing. We present a
case of successfully performed laparoscopic cholecystectomy on a patient who previously had
multiple ventriculoperitoneal shunts and an appendectomy. Since there is small number of
reported laparoscopic cholecystectomies after ventriculoperitoneal shunts we consider that it is
important to record these cases and confirm the view about standard approach to the problem.
Renormalization group study of random quantum magnets
Creators: name: Kovács, István A.
name: Iglói, Ferenc
Publisher: name: arXiv
Year: 2011
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We have developed a very efficient numerical algorithm of the strong disorder renormalization group method to study the critical behaviour of the random transverse-field Ising model, which is a prototype of random quantum magnets. With this algorithm we can renormalize an N-site cluster within a time N*log(N), independently of the topology of the graph and we went up to N~4*10^6. We have studied regular lattices with dimension D<=4 as well as Erdos-Renyi random graphs, which are infinite dimensional objects. In all cases the quantum critical behaviour is found to be controlled by an infinite disorder fixed point, in which disorder plays a dominant role over quantum fluctuations. As a consequence the renormalization procedure as well as the obtained critical properties are asymptotically exact for large systems. We have also studied Griffiths singularities in the paramagnetic and the ferromagnetic phases and generalized the numerical algorithm for another random quantum systems.
description: 12 pages, 12 figures
Cosmic ray transport in partially turbulent space plasmas with compressible magnetic turbulence
Creators: name: Casanova, Sabrina
name: Schlickeiser, Reinhard
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recently a new transport theory of cosmic rays in magnetized space plasmas extending the quasilinear approximation to the particle orbit has been developed for the case of an axisymmetric incompressible magnetic turbulence. Here we generalize the approach to the important physical case of a compressible plasma. As previously obtained in the case of an incompressible plasma we allow arbitrary gyrophase deviations from the unperturbed spiral orbits in the uniform magnetic field. For the case of quasi-stationary and spatially homogeneous magnetic turbulence we derive in the small Larmor radius approximation gyro-phase averaged cosmic ray Fokker-Planck coefficients. Upper limits for the perpendicular and pitch-angle Fokker-Planck coefficients and for the perpendicular and parallel spatial diffusion coefficients are presented.
description: Accepted for publication in ApJ
Nonperturbative Quantum Gravity
Creators: name: Ambjorn, J.
name: Goerlich, A.
name: Jurkiewicz, J.
name: Loll, R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Asymptotic safety describes a scenario in which general relativity can be quantized as a conventional field theory, despite being nonrenormalizable when expanding it around a fixed background geometry. It is formulated in the framework of the Wilsonian renormalization group and relies crucially on the existence of an ultraviolet fixed point, for which evidence has been found using renormalization group equations in the continuum. "Causal Dynamical Triangulations" (CDT) is a concrete research program to obtain a nonperturbative quantum field theory of gravity via a lattice regularization, and represented as a sum over spacetime histories. In the Wilsonian spirit one can use this formulation to try to locate fixed points of the lattice theory and thereby provide independent, nonperturbative evidence for the existence of a UV fixed point. We describe the formalism of CDT, its phase diagram, possible fixed points and the "quantum geometries" which emerge in the different phases. We also argue that the formalism may be able to describe a more general class of Hořava-Lifshitz gravitational models.
description: Review, 146 pages, many figures
Lower Cambrian stratigraphy of Pelly Mountains, Central Yukon Territory
Creators: name: Read, Burton Charles
Publisher: name: University of Calgary
Year: 1976
Subjects: subject: QE 656 R37 1976 Microfiche
subject: Geology, Stratigraphic - Cambrian
subject: Geology - Yukon Territory

description: Bibliography: p. 139-146.
Exploring Marine Primary Productivity with Descriptive Statistics and Graphing in Excel
Creators: name: McLeod, Marina
name: Olson, Jennifer
name: Houston, Wendy
Publisher: name: QUBES Educational Resources
Year: 2021

description: In this activity, students use real water chemistry data and descriptive statistics in Excel to examine primary productivity in an urban estuary of the Salish Sea. They will consider how actual data do or do not support expected annual trends.
Organizational, contextual, and autonomic correlates of verbalized mother-adolescent conflict : an explorative study
Creators: name: Chipman, Jane Frances
Publisher: name: University of British Columbia
Year: 2009

description: Although there have been consistent findings that moderate levels of family conflict are normative during adolescence (Laursen & Collins, 2004; Montemayor, 1983; Rutter, Graham, Chadwick, and Yule, 1976), the majority of work has focused on frequency and intensity of conflict, largely ignoring other contextual factors that may account for the variance in parent-adolescent verbal conflicts. Additionally, extant research has not examined both parent and adolescent autonomic responding during conflict. The purpose of this study is to address these gaps in knowledge regarding parent-adolescent conflict. A sample of 40 mother-adolescent dyads participated in a revealed differences task to attempt to resolve an area of disagreement. Context-specific features of parent-adolescent verbal conflict were examined in two ways. First, verbal and non-verbal expressions were coded for content and valence following procedures set out by The Oregon Social Learning Center (1998). Second, following the tradition of sociolinguistics, conversational styles (interruptions, turn-taking violations, listening) were assessed following procedures described by Beaumont (1993). Psychophysiological measures (respiratory sinus arrhythmia, cardiac pre-ejection period, electrodermal responding) were continuously recorded for both parent and adolescent for the entirety of the discussion. Results indicated that mothers tended to use positive and neutral content and valence whereas adolescents used negative valence and aversive interactions. In terms of conversational styles, adolescents utilized each of the conversational speech acts more than mothers and tended to perseverate in use of interruptive speech behaviours. However, mothers were shown to utilize a high-considerateness style (i.e., few turn-taking interruptions) to facilitate adolescent conversational involvement. Measures of physiological responding revealed associations with content, valence, and conversational speech acts; positive and neutral aspects of conversation corresponded with parasympathetic responding and negative conversational aspects corresponded with sympathetic arousal. Together, these findings illustrate what contextual features may comprise a moderate level of conflict and provide further insight into the overall processes of parent-adolescent conflict. Implications of these findings for future directions in research on parent-adolescent conflict are discussed.
Facies analysis and depositional environments in the Middle Devonian Fort Vermillion and Slave Point formations of Northern Alberta
Creators: name: Crawford, Frank D.
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: QE 665 C74 1972
subject: Geology, Stratigraphic - Devonian
subject: Geology - Alberta
subject: Paleontology - Devonian

description: Bibliography: p. 87-92.
X-ray view on a Class using Conceptual Analysis in Java Environment
Creators: name: Kumar, Gulshan
name: Rai, Prof. Mritunjay Kumar
Publisher: name: arXiv
Year: 2011
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Modularity is one of the most important principles in software engineering and a necessity for every practical software. Since the design space of software is generally quite large, it is valuable to provide automatic means to help modularizing it. An automatic technique for software modularization is object- oriented concept analysis (OOCA). X-ray view of the class is one of the aspect of this Object oriented concept analysis. We shall use this concept in a java environment.
description: 6 pages
eatATA: Automated Test Assembly for R-users
Creators: name: Debeer, Dries
name: Becker, Benjamin
Publisher: name: Zenodo
Year: 2023
Subjects: Automated Test Assembly (ATA)
R-package
Software

description: In psychological and educational assessment, combining items from an existing item pool into new test forms is a well-known problem, generally referred to as Test Assembly. Especially when multiple test forms need to be assembled, while also maintaining psychometric and item-content related requirements in each form, these problems can quickly become challenging. Solving such a complex combinatorial optimization problem by hand is inefficient, error prone, and likely to result in sub-optimal solutions. Yet, because these assembly problems can be viewed as (and translating into) mixed integer linear programming problems, they can be efficiently addressed through software tools with high-end mathematical programming algorithms. However, although these software tools can be used to perform assembly tasks efficiently and automatically, they were generally not designed with automated test assembly in mind. Consequently, these tools are often unknown or unavailable to the researchers that are confronted with test assembly problems. The R-package eatATA aims at making automated test assembly for R users as easy as fitting a linear regression model. The package was designed specifically from the perspective of Automated Test Assembly (ATA), and makes several software tools for mixed-integer linear programming available in a straightforward and convenient manner. In this presentation, we discuss the general functionality of the eatATA package and, using practical use cases, we demonstrate how its workflow is intuitive for R-users.
Depositional patterns in the Upper Cambrian Lyell formation, southern Canadian Rocky Mountains
Creators: name: Sargent, Melville Wayne
Publisher: name: University of Calgary
Year: 1976
Subjects: subject: QE 656 S37 1975 Microfiche
subject: Geology, Stratigraphic - Cambrian
subject: Sedimentation and deposition
subject: Geology - Rocky Mountains, Canada

description: Bibliography: p. 238-254.
Piezoelectric strain induced variation of the magnetic anisotropy in a high Curie temperature (Ga,Mn)As sample
Creators: name: Casiraghi, A.
name: Rushforth, A. W.
name: Zemen, J.
name: Haigh, J. A.
name: Wang, M.
name: Edmonds, K. W.
name: Campion, R. P.
name: Gallagher, B. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We show that effective electrical control of the magnetic properties in the ferromagnetic semiconductor (Ga,Mn)As is possible using the strain induced by a piezoelectric actuator even in the limit of high doping levels and high Curie temperatures, where direct electric gating is not possible. We demonstrate very large and reversible rotations of the magnetic easy axis. We compare the results obtained from magneto-transport and SQUID magnetometry measurements, extracting the dependence of the piezo-induced uniaxial magnetic anisotropy constant upon strain in both cases and detailing the limitations encountered in the latter approach.
A minimum single-band model for low-energy excitations in superconducting K$_x$Fe$_2$Se$_2$
Creators: name: Zhou, Tao
name: Wang, Z. D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We propose a minimum single-band model for the newly discovered iron-based superconducting K$_x$Fe$_2$Se$_2$. Our model is found to be numerically consistent with the five-orbital model at low energies. Based on our model and the random phase approximation, we study the spin fluctuation and the pairing symmetry of superconducting gap function. The $(π/2,π/2)$ spin excitation and the $d_{x^2-y^2}$ pairing symmetry are revealed. All of the results can well be understood in terms of the interplay between the Fermi surface topology and the local spin interaction, providing a sound picture to explain why the superconducting transition temperature is as high as to be comparable to those in pnictides and some cuprates. A common origin of superconductivity is elucidated for this compound and other high-T$_c$ materials.
description: 5 pages, 4 figures
Using Deep Ensemble Forest for High Resolution Mapping of PM2.5 from MODIS MAIAC AOD in Tehran, Iran
Creators: name: Bagheri, Hossein
Publisher: name: arXiv
Year: 2024
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: High resolution mapping of PM2.5 concentration over Tehran city is challenging because of the complicated behavior of numerous sources of pollution and the insufficient number of ground air quality monitoring stations. Alternatively, high resolution satellite Aerosol Optical Depth (AOD) data can be employed for high resolution mapping of PM2.5. For this purpose, different data-driven methods have been used in the literature. Recently, deep learning methods have demonstrated their ability to estimate PM2.5 from AOD data. However, these methods have several weaknesses in solving the problem of estimating PM2.5 from satellite AOD data. In this paper, the potential of the deep ensemble forest method for estimating the PM2.5 concentration from AOD data was evaluated. The results showed that the deep ensemble forest method with R2 = 0.74 gives a higher accuracy of PM2.5 estimation than deep learning methods (R2 = 0.67) as well as classic data-driven methods such as random forest (R2 = 0.68). Additionally, the estimated values of PM2.5 using the deep ensemble forest algorithm were used along with ground data to generate a high resolution map of PM2.5. Evaluation of the produced PM2.5 map revealed the good performance of the deep ensemble forest for modeling the variation of PM2.5 in the city of Tehran.
Data Stewardship Wizard helps to fight COVID-19 inside VODAN-in-a-Box
Creators: name: Suchánek, Marek
name: Pergl, Robert
name: Slifka, Jan
name: Knaisl, Vojtěch
Publisher: name: Zenodo
Year: 2020
Subjects: COVID-19
Data Stewardship Wizard
Case Report Form
RDF
Triple Store

description: VODAN-in-a-Box was deployed into practice by VODAN (Virus Outbreak Data Network) Africa, being a GO FAIR Foundation-supported Implementation Network that brings together several universities and hospitals across Africa with professors and graduates from Leiden´s University. It was set up to enable access to critically important data from Africa and the rest of the world to help fight and contain the COVID-19 outbreak. The toolset facilitates capturing data related to the COVID-19 and metadata describing these datasets. The DSW serves in this project as a data collection tool or so-called "CRF Wizard". It is used for entering and analyzing patient data from the case report forms (CRFs). This data is automatically stored in the RDF triple-store and metadata in the FAIR Data Point, so the VODAN-in-a-Box fully complies with all the FAIR principles by making the data findable, accessible, interoperable, and reusable, which is one of the key aspects when fighting any worldwide virus outbreak, not only COVID-19. The VODAN-in-a-Box was first installed at Kampala International University in Uganda, Africa on July 22, 2020, then installations in Ethiopia (2 installations), Nigeria, Kenya, Tunisia and Zimbabwe followed shortly after that, and now the solution is widely used by the VODAN Africa community in general. The whole VODAN-in-a-Box solution is publicly available, therefore, anyone can try it and deploy it for their own use and also participate in the development under the open-source model.
Electroluminescence from Strained Ge membranes and Implications for an Efficient Si-Compatible Laser
Creators: name: Nam, Donguk
name: Sukhdeo, David
name: Cheng, Szu-Lin
name: Roy, Arunanshu
name: Huang, Kevin Chih-Yao
name: Brongersma, Mark
name: Nishi, Yoshio
name: Saraswat, Krishna
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We demonstrate room-temperature electroluminescence (EL) from light-emitting diodes (LED) on highly strained germanium (Ge) membranes. An external stressor technique was employed to introduce a 0.76% bi-axial tensile strain in the active region of a vertical PN junction. Electrical measurements show an on-off ratio increase of one order of magnitude in membrane LEDs compared to bulk. The EL spectrum from the 0.76% strained Ge LED shows a 100nm redshift of the center wavelength because of the strain-induced direct band gap reduction. Finally, using tight-binding and FDTD simulations, we discuss the implications for highly efficient Ge lasers.
description: 4 Pages, 5 figures
Comparison of some gas-liquid pipeline design method with field data
Creators: name: Osman, Mohammed El-Sayed
Publisher: name: Engineering
Year: 1978
Subjects: subject: TN 880.5 O85 1977 Microfiche
subject: Gas - Pipe lines
subject: Gas, Natural - Pipe lines
subject: Two-phase flow

description: Bibliography: p. 92-97.
Composite Fermions in Periodic and Random Anti-Dot Lattices
Creators: name: Smet, J.
name: Weiss, Dieter
name: Klitzing, K.
name: Coleridge, P.
name: Wasilewski, Z.
name: Bergmann, R.
name: Schweizer, H.
name: Scherer, A.
Publisher: name: Universität Regensburg
Year: 1997
Subjects: subject: 530 Physik

description: The longitudinal and Hall magnetoresistance of random and periodic arrays of artificial scatterers, imposed on a high-mobility two- dimensional electron gas, were investigated in the vicinity of Landau level filling factor í=1/2. In periodic arrays, commensurability effects between the period of the antidot array and the cyclotron radius of composite fermions are observed. In addition, the Hall resistance shows a deviation from the anticipated linear dependence, reminiscent of quenching around zero magnetic field. Both effects are absent for random antidot lattices. The relative amplitude of the geometric resonances for opposite signs of the effective magnetic field and its dependence on illumination illustrate enhanced soft wall effects for composite fermions.