cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Study of the variability of Blazars gamma-ray emission
Creators: name: Sbarrato, T.
name: Foschini, L.
name: Ghisellini, G.
name: Tavecchio, F.
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: The gamma-ray emission of blazar jets shows a pronounced variability and this feature provides limits to the size and to the speed of the emitting region. We study the gamma-ray variability of bright blazars using data from the first 18 months of activity of the Large Area Telescope on the Fermi Gamma-Ray Space Telescope. From the daily light-curves of the blazars characterized by a remarkable activity, we firstly determine the minimum variability time-scale, giving an upper limit for the size of the emitting region of the sources, assumed to be spheroidal blobs in relativistic motion. These regions must be smaller than ~10^-3 parsec. Another interesting time-scale is the duration of the outbursts. We conclude that they cannot correspond to radiation produced by a single blob moving relativistically along the jet, but they are either the signature of emission from a standing shock extracting energy from a modulated jet, or the superposition of a number of flares occurring on a shorter time-scale. We also derive lower limits on the bulk Lorentz factor needed to make the emitting region transparent for gamma-rays interacting through photon-photon collisions.
description: 11 pages, 7 figures, accepted for publication on Advances in Space Research. Poster presented at COSPAR 2010 (Bremen), event E11 (Time variability at high energies: a probe of AGN physics)
Connection, collaboration and community : reflections on the use of videoconferencing in Kaska language documentation, revitalization and education
Creators: name: Sear, Victoria Frances
Publisher: name: University of British Columbia
Year: 2018

description: This thesis addresses how stakeholders of Kaska, a Dene Athabaskan language spoken in northeastern British Columbia and the southeastern Yukon, have incorporated videoconferencing technology into their long-distance language documentation, revitalization and education practices. Many speakers and communities of endangered, Indigenous, and minority languages who live in remote regions are at a disadvantage simply because of their remoteness, which has limited their ability to access funding, form partnerships and work with language researchers. In turn, historically such Indigenous languages — their speakers, their stakeholders and their projects — have been under-resourced. This thesis discusses how a team of Kaska language workers have used a professional videoconferencing platform to regularly engage in long-distance collaborative language projects between Watson Lake, Yukon, and Vancouver, British Columbia. While language projects often focus either on documentation or revitalization of a language, in these videoconferencing sessions project collaborators are able to integrate these two activities. The incorporation of this technology in their language work has had several positive by-products for project collaborators, including strengthened personal relationships, a heightened sense of connectedness to language, land and each other, and an interdependence on each other that also distributes authority, all of which have formed a community of practice that has made this language team into invested collaborators. Ultimately, this research suggests that in certain circumstances, videoconferencing technology can be used to support language documentation, revitalization and education, as well as the people who undertake such projects, in a myriad of ways that extends beyond the intended outputs of the projects themselves.
Phytochemical and biological investigations of Salvia microphylla leaf extracts using LC-MS/MS
Creators: name: Deghachi, Nour El-Houda
name: Ali-Rachedi, Fahima
name: Guehria, Ines
name: Laoud, Aicha
name: Gheid, Abdelhak
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Plant Biology

description: In this research, the total phenolics, antioxidant activity, and antibacterial susceptibility of Salvia microphylla leaf extracts were studied using solvents of varying polarity (n-hexane, dichloromethane, ethyl acetate, and 80% methanol). Total phenolic content (TPC) and total flavonoid content (TFC) were estimated using the Folin-Ciocalteu and aluminium chloride colorimetric methods, respectively. Phytochemical analysis was conducted using the LC-ESI-MS/MS method. By using the FRAP and DPPH methods, the antioxidant activities were measured spectrophotometrically. The antimicrobial assay was done through the agar-well diffusion method against the Gram-negative and Gram-positive bacteria. All extracts showed potent antimicrobial activity, with the hexane extract displaying strong inhibitory effects. These findings indicate that S. microphylla leaf extracts contain promising bioactive compounds possessing antioxidant and antibacterial properties, suggesting further research to isolate and characterise these bioactive compounds and assess their in vivo effects.
The Merger Rate of Extremely Low Mass White Dwarf Binaries: Links to the Formation of AM CVn Stars and Underluminous Supernovae
Creators: name: Brown, Warren R.
name: Kilic, Mukremin
name: Prieto, Carlos Allende
name: Kenyon, Scott J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study a complete, colour-selected sample of double-degenerate binary systems containing extremely low mass (ELM) <0.25 Msol white dwarfs (WDs). We show, for the first time, that Milky Way disk ELM WDs have a merger rate of approximately 4 x 10^(-5)/yr due to gravitational wave radiation. The merger end-product depends on the mass ratio of the binary. The ELM WD systems that undergo stable mass transfer can account for >3% of AM CVn stars. More importantly, the ELM WD systems that may detonate merge at a rate comparable to the estimated rate of underluminous SNe, rare explosions estimated to produce only ~0.2 Msol worth of ejecta. At least 25% of our ELM WD sample belong to the old thick disk and halo components of the Milky Way. Thus, if merging ELM WD systems are the progenitors of underluminous SNe, transient surveys must find them in both elliptical and spiral galaxies.
description: MNRAS Letters, in press
The Herschel Virgo Cluster Survey: VII. Dust in cluster dwarf elliptical galaxies
Creators: name: De Looze, I.
name: Baes, M.
name: Zibetti, S.
name: Fritz, J.
name: Cortese, L.
name: Davies, J. I.
name: Verstappen, J.
name: Bendo, G. J.
name: Bianchi, S.
name: Clemens, M.
name: Bomans, D. J.
name: Boselli, A.
name: Corbelli, E.
name: Dariush, A.
name: Alighieri, S. di Serego
name: Fadda, D.
name: Garcia-Appadoo, D. A.
name: Gavazzi, G.
name: Giovanardi, C.
name: Grossi, M.
name: Hughes, T. M.
name: Hunt, L. K.
name: Jones, A. P.
name: Madden, S.
name: Pierini, D.
name: Pohlen, M.
name: Sabatini, S.
name: Smith, M. W. L.
name: Vlahakis, C.
name: Xilouris, E. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We use the Science Demonstration Phase data of the Herschel Virgo Cluster Survey to search for dust emission of early-type dwarf galaxies in the central regions of the Virgo Cluster as an alternative way of identifying the interstellar medium.We present the first possible far-infrared detection of cluster early-type dwarf galaxies: VCC781 and VCC951 are detected at the 10 sigma level in the SPIRE 250 micron image. Both detected galaxies have dust masses of the order of 10^5 Msun and average dust temperatures ~20K. The detection rate (less than 1%) is quite high compared to the 1.7% detection rate for Hi emission, considering that dwarfs in the central regions are more Hi deficient. We conclude that the removal of interstellar dust from dwarf galaxies resulting from ram pressure stripping, harassment, or tidal effects must be as efficient as the removal of interstellar gas.
description: Letter accepted for publication in A&A (Herschel special issue)
Lyman Break Analogs: Constraints on the Formation of Extreme Starbursts at Low and High Redshift
Creators: name: Gonçalves, Thiago S.
name: Overzier, Roderik
name: Basu-Zych, Antara
name: Martin, D. Christopher
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Lyman Break Analogs (LBAs), characterized by high far-UV luminosities and surface brightnesses as detected by GALEX, are intensely star-forming galaxies in the low-redshift universe ($z\sim 0.2$), with star formation rates reaching up to 50 times that of the Milky Way. These objects present metallicities, morphologies and other physical properties similar to higher redshift Lyman Break Galaxies (LBGs), motivating the detailed study of LBAs as local laboratories of this high-redshift galaxy population. We present results from our recent integral-field spectroscopy survey of LBAs with Keck/OSIRIS, which shows that these galaxies have the same nebular gas kinematic properties as high-redshift LBGs. We argue that such kinematic studies alone are not an appropriate diagnostic to rule out merger events as the trigger for the observed starburst. Comparison between the kinematic analysis and morphological indices from HST imaging illustrates the difficulties of properly identifying (minor or major) merger events, with no clear correlation between the results using either of the two methods. Artificial redshifting of our data indicates that this problem becomes even worse at high redshift due to surface brightness dimming and resolution loss. Whether mergers could generate the observed kinematic properties is strongly dependent on gas fractions in these galaxies. We present preliminary results of a CARMA survey for LBAs and discuss the implications of the inferred molecular gas masses for formation models.
description: To appear in the proceedings of IAU Symposium 277, "Tracing the Ancestry of Galaxies on the Land of our Ancestors", eds. C. Carignan, K.C. Freeman, and F. Combes
Quasiparticle interference of C2-symmetric surface states in LaOFeAs parent compound
Creators: name: Zhou, Xiaodong
name: Ye, Cun
name: Cai, Peng
name: Wang, Xiangfeng
name: Chen, Xianhui
name: Wang, Yayu
Publisher: name: arXiv
Year: 2010
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present scanning tunneling microscopy studies of the LaOFeAs parent compound of iron pnictide superconductors. Topographic imaging reveals two types of atomically flat surfaces, corresponding to the exposed LaO layer and FeAs layer respectively. On one type of surface, we observe strong standing wave patterns induced by quasiparticle interference of two-dimensional surface states. The distribution of scattering wavevectors exhibits pronounced two-fold symmetry, consistent with the nematic electronic structure found in the Ca(Fe1-xCox)2As2 parent state.
description: 13 pages, 4 figures
The outward contemplative in higher education : mindfully forging ontological security in intersubjectivity
Creators: name: Zhao, Steven
Publisher: name: University of British Columbia
Year: 2018

description: This thesis is concerned with three fundamental questions. First, why does North American higher education minimally engage with the existential dimensions of its students (their interests and inquiries regarding the formation of their personal narratives of meaning, moral directions, and a sense of stable identity)? Second, what are the potential psychological and social consequences of such negligence? Third, how can contemplative pedagogy adequately address such existential dimensions? This thesis explores the history of Western higher education, particularly the way that changing educational philosophies and curricula of education have affected the understanding of the self. I argue that there has been a radical shift in the understanding of self in higher education. The self has been progressively ejected from its proximate temporal, material, institutional, and metaphysical surroundings. In the process, the internal self became the source for truth and ethics formerly derived from the objectivism of religion and science. With the loss of objective moral and existential facts as philosophically disputable, politically uncomfortable, and institutionally irrelevant, this new self was made to bear a heavy burden. In these conditions, minimal engagement with existential dimensions of students in higher education can exacerbate ontological insecurity, where the individual experiences an instability and discontinuity in their sense of self. I argue that ontological insecurity has become normalized within higher education, leading to the perpetuation of destructive behaviours on both individual and group levels. Contemplative pedagogy has the potential to address issues of ontological insecurity. By examining the major discourses of contemplative pedagogy, I argue that current two dominant discourses of mindfulness, scientific-psychological mindfulness and transpersonal mindfulness, are inadequate in addressing ontological insecurity. I propose supplementing mindfulness with traditional Theravada notions of dependent co-arising and the phenomenological-existentialist understanding of intersubjectivity. By integrating dependent co-arising and intersubjectivity with mindfulness, a student can be sensitized to their existential dependence on social relationships with others. Ethically sensitive relationships with others provide the fundamental source of ontological security.
Which halos host Herschel-ATLAS galaxies in the local Universe?
Creators: name: Guo, Qi
name: Cole, Shaun
name: Lacey, Cedric G.
name: Baugh, Carlton M.
name: Frenk, Carlos S.
name: Norberg, Peder
name: Auld, R.
name: Baldry, I. K.
name: Bamford, S. P.
name: Bourne, N.
name: Buttiglione, E. S.
name: Cava, A.
name: Cooray, A.
name: Croom, S.
name: Dariush, A.
name: De Zotti, G.
name: Driver, S.
name: Dunne, L.
name: Dye, S.
name: Eales, S.
name: Fritz, J.
name: Hopkins, A.
name: Hopwood, R.
name: Ibar, E.
name: Ivison, R. J.
name: Jarvis, M.
name: Jones, D. H.
name: Kelvin, L.
name: Liske, J.
name: Loveday, J.
name: Maddox, S. J.
name: Parkinson, H.
name: Pascale, E.
name: Peacock, J. A.
name: Pohlen, M.
name: Prescott, M.
name: Rigby, E. E.
name: Robotham, A.
name: Rodighiero, G.
name: Sharp, R.
name: Smith, D. J. B.
name: Temi, P.
name: van Kampen, E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We measure the projected cross-correlation between low redshift (z < 0.5) far-IR selected galaxies in the SDP field of the Herschel-ATLAS (H-ATLAS) survey and optically selected galaxies from the Galaxy and Mass Assembly (GAMA) redshift survey. In order to obtain robust correlation functions, we restrict the analysis to a subset of 969 out of 6900 H-ATLAS galaxies, which have reliable optical counterparts with r<19.4 mag and well-determined spectroscopic redshifts. The overlap region between the two surveys is 12.6 sq. deg; the matched sample has a median redshift of z ~ 0.2. The cross-correlation of GAMA and H-ATLAS galaxies within this region can be fitted by a power law, with correlation length r_0 ~ 4.63 +/- 0.51 Mpc. Comparing with the corresponding auto-correlation function of GAMA galaxies within the SDP field yields a relative bias (averaged over 2-8 Mpc) of H-ATLAS and GAMA galaxies of b_H/b_G ~ 0.6. Combined with clustering measurements from previous optical studies, this indicates that most of the low redshift H-ATLAS sources are hosted by halos with masses comparable to that of the Milky Way. The correlation function appears to depend on the 250 um luminosity, L_250, with bright (median luminosity νL_250 ~ 1.6 x 10^10 L_sun) objects being somewhat more strongly clustered than faint (νL_250 ~ 4.0 x 10^9 L_sun) objects. This implies that galaxies with higher dust-obscured star formation rates are hosted by more massive halos.
description: 9 pages, 8 figures, 1 table, submitted to MNRAS
Active split-ring metamaterial slabs for magnetic resonance imaging
Creators: name: Lopez, Marcos A.
name: Algarin, Jose M.
name: Freire, Manuel J.
name: Behr, Volker C.
name: Jakob, Peter M.
name: Marques, Ricardo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: In this work, it is analyzed the ability of split-ring metamaterial slabs with zero/high permeability to reject/confine the radiofrequency magnetic field in magnetic resonance imaging systems. Using an homogenization procedure, split-ring slabs have been designed and fabricated to work in a 1.5T system. Active elements consisting of pairs of crossed diodes are inserted in the split-rings. With these elements, the permeability of the slabs can be automatically switched between a unity value when interacting with the strong excitation field of the transmitting body coil, and zero or high values when interacting with the weak field produced by protons in tissue. Experiments are shown for different configurations where these slabs can help to locally increase the signal-to-noise-ratio.
description: 6 pages, 4 figures
The role of magnetic reconnection on jet/accretion disk systems
Creators: name: Pino, E. M. de Gouveia Dal
name: Piovezan, P. P.
name: Kadowaki, L. H. S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: It was proposed earlier that the relativistic ejections observed in microquasars could be produced by violent magnetic reconnection episodes at the inner disk coronal region. Here we revisit this model, which employs a standard accretion disk description and fast magnetic reconnection theory, and discuss the role of magnetic reconnection and associated heating and particle acceleration in different jet/disk accretion systems, namely young stellar objects (YSOs), microquasars, and active galactic nuclei (AGNs).
description: 9 pages, 4 figures, accepted for publication in Astronomy & Astrophysics
IMPROVING SOFTWARE FAULT PREDICTION THROUGH CROSS-PROJECT ANALYSIS A FOCUS ON IMBALANCED DATA AND GENERALIZATION
Creators: name: ADVANCED RESEARCH AND INNOVATIONS JOURNAL
Publisher: name: ari
Year: 2025

description: This paper delves into the challenges of generalizing models and dealing with contradicting evidence. Additionally, it delves into the potential for enhancing software failure prediction by integrating several research endeavors. Conventional methods of failure prediction could not be highly task-specific due to the fact that not all tasks had access to the same data. To overcome these challenges and achieve better prediction accuracy, you can employ feature selection techniques, data resampling tactics, and machine learning procedures. The project involves exploring the usage of various datasets and enhancing model training to expedite problem detection and ensure that solutions are compatible with different software configurations. Software quality assurance methods can be improved and made more adaptable as a direct consequence of the findings.
The ELM Survey. I. A Complete Sample of Extremely Low Mass White Dwarfs
Creators: name: Brown, Warren R.
name: Kilic, Mukremin
name: Prieto, Carlos Allende
name: Kenyon, Scott J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze radial velocity observations of the 12 extremely low-mass <0.25 Msol white dwarfs (WDs) in the MMT Hypervelocity Star Survey. Eleven of the 12 WDs are binaries with orbital periods shorter than 14 hours; the one non-variable WD is possibly a pole-on system among our non-kinematically selected targets. Our sample is unique: it is complete in a well-defined range of apparent magnitude and color. The orbital mass functions imply that the unseen companions are most likely other WDs, although neutron star companions cannot be excluded. Six of the 11 systems with orbital solutions will merge within a Hubble time due to the loss of angular momentum through gravitational wave radiation. The quickest merger is J0923+3028, a g=15.7 ELM WD binary with a 1.08 hr orbital period and a <130 Myr merger time. The chance of a supernova Ia event among our ELM WDs is only 1%-7%, however. Three binary systems (J0755+4906, J1233+1602, and J2119-0018) have extreme mass ratios and will most likely form stable mass-transfer AM CVn systems. Two of these objects, SDSS J1233+1602 and J2119-0018, are the lowest surface gravity WDs ever found; both show Ca II absorption likely from accretion of circumbinary material. We predict that at least one of our WDs is an eclipsing detached double WD system, important for constraining helium core WD models.
description: ApJ, in press
Size-dependence of Strong-Coupling Between Nanomagnets and Photonic Cavities
Creators: name: Soykal, Ö. O.
name: Flatté, M. E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The coherent dynamics of a coupled photonic cavity and a nanomagnet is explored as a function of nanomagnet size. For sufficiently strong coupling eigenstates involving highly entangled photon and spin states are found, which can be combined to create coherent states. As the size of the nanomagnet increases its coupling to the photonic mode also monotonically increases, as well as the number of photon and spin states involved in the system's eigenstates. For small nanomagnets the crystalline anisotropy of the magnet strongly localized the eigenstates in photon and spin number, quenching the potential for coherent states. For a sufficiently large nanomagnet the macrospin approximation breaks down and different domains of the nanomagnet may couple separately to the photonic mode. Thus the optimal nanomagnet size is just below the threshold for failure of the macrospin approximation.
description: 10 pages, 7 figures
Life around the scallop theorem
Creators: name: Lauga, Eric
Publisher: name: arXiv
Year: 2010
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Locomotion on small scales is dominated by the effects of viscous forces and, as a result, is subject to strong physical and mathematical constraints. Following Purcell's statement of the scallop theorem which delimitates the types of swimmer designs which are not effective on small scales, we review the different ways the constraints of the theorem can be escaped for locomotion purposes.
Early LHC bound on W' boson in the nonuniversal gauge interaction model
Creators: name: Kim, Yeong Gyun
name: Lee, Kang Young
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the phenomenology of the heavy charged gauge boson and obtain the lower bounds on its mass with the early LHC data at 7 TeV center-of-mass energy in the nonuniversal gauge interaction model, in which the electroweak SU(2) gauge group depends upon the fermion family. We found that the direct bound on the mass of the $W'$ boson is compatible to the indirect bound with only the early data of the LHC.
description: 6 pages, 3 figures
Open quantum systems approach to atomtronics
Creators: name: Pepino, R. A.
name: Cooper, J.
name: Meiser, D.
name: Anderson, D. Z.
name: Holland, M. J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We derive a quantum master equation to treat quantum systems interacting with multiple reservoirs. The formalism is used to investigate atomic transport across a variety of lattice configurations. We demonstrate how the behavior of an electronic diode, a field-effect transistor, and a bipolar junction transistor can be realized with neutral, ultracold atoms trapped in optical lattices. An analysis of the current fluctuations is provided for the case of the atomtronic diode. Finally, we show that it is possible to demonstrate AND logic gate behavior in an optical lattice.
description: 10 pages, 10 figures, 1 table
Modelling and development of thermo-mechanical energy storage
Creators: name: Farres Antunez, Pau
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: Energy storage
Thermo-mechanical energy storage
Large-scale energy storage
Bulk energy storage
Sustainability
Thermal energy storage
Heat exchangers
Exergy
Pumped thermal energy storage
Liquid air energy storage
Efficiency
Energy efficiency
Entropy minimisation
Thermodynamic cycle analysis
Entropy generation minimisation
Axial conduction
Real properties
Sensible heat

description: Pumped thermal energy storage (PTES) and liquid air energy storage (LAES) are two technologies that use mechanically-driven thermodynamic cycles to store electricity in the form of high-grade thermal energy, employing abundant materials that are kept in large insulated tanks. Both technologies are free from geographic constraints, providing a significant advantage over competing methods such as pumped hydro or compressed air energy storage. The focus of this thesis is on the analysis, modelling and development of these technologies. A number of PTES systems have been proposed based on different thermodynamic cycles. A variant based on the Joule-Brayton cycle employing liquid storage media is studied here. An analytical study is presented that reveals how the performance of the cycle varies along a range of operating conditions. Generally, the same strategies that minimise compression/expansion losses also maximise heat exchanger losses, which results in optimal points at certain operating conditions. A numerical model is developed to find these optima while accounting for real fluid properties. Employing a regenerative heat exchanger is found useful to adapt the cycle to the operating temperature ranges of the storage liquids and to increase the performance of the cycle. A new combined cycle that integrates PTES and LAES is presented. The fundamental advantage is that the cold thermal reservoirs that would be required by the separate cycles are replaced by a single heat exchanger that acts between them, thereby saving significant amounts of storage media per unit of energy stored. Several configurations are possible and these are studied and optimised. The most advanced configuration reaches a round-trip efficiency of 71 % under nominal conditions, compared to 65 % for stand-alone PTES and 61 % for LAES. A further adaptation of the combined cycle is presented which only employs water and liquid air as storage media, dramatically reducing the cost of energy capacity. The performance of the heat exchangers is found to have a significant impact on the overall performance of the various cycles. For this reason, an optimisation procedure is developed to obtain heat exchanger designs that minimise entropy generation for a given amount of material. These designs are used when estimating the costs of energy capacity and power capacity of each cycle. Results indicate that the best cycle configurations would be competitive with reported costs for pumped hydro and compressed air energy storage.
description: This PhD project was funded by a Peterhouse Graduate Studentship.
Memory effects in complex materials and nanoscale systems
Creators: name: Pershin, Yuriy V.
name: Di Ventra, Massimiliano
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Memory effects are ubiquitous in nature and are particularly relevant at the nanoscale where the dynamical properties of electrons and ions strongly depend on the history of the system, at least within certain time scales. We review here the memory properties of various materials and systems which appear most strikingly in their non-trivial time-dependent resistive, capacitative and inductive characteristics. We describe these characteristics within the framework of memristors, memcapacitors and meminductors, namely memory circuit elements whose properties depend on the history and state of the system. We examine basic issues related to such systems and critically report on both theoretical and experimental progress in understanding their functionalities. We also discuss possible applications of memory effects in various areas of science and technology ranging from digital to analog electronics, biologically-inspired circuits, and learning. We finally discuss future research opportunities in the field.
description: Review submitted to Advances in Physics
Drell-Yan process at forward rapidity at the LHC
Creators: name: Golec-Biernat, Krzysztof
name: Lewandowska, Emilia
name: Stasto, Anna M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the Drell-Yan lepton pair production at forward rapidity at the Large Hadron Collider. Using the dipole framework for the computation of the cross section we find a significant suppression in comparison to the collinear factorization formula due to saturation effects in the dipole cross section. We develop a twist expansion in powers of Q_s^2/M^2 where Q_s is the saturation scale and M the invariant mass of the produced lepton pair. For the nominal LHC energy the leading twist description is sufficient down to masses of 6 GeV. Below that value the higher twist terms give a significant contribution.
description: 13 pages, 7 figures
Seguimiento imaginario a un turista
Creators: name: Pérez Caballero, Jesús
Publisher: name: Zenodo
Year: 2019
Subjects: Matamoros
frontera norte
Río Bravo
turismo
vagabundeo
México
Tamaulipas

description: Columna "Corredor Fronterizo", en el diario Milenio Monterrey, en la que se hace un seguimiento imaginario a un turista en una de las riberas del Río Bravo a su paso por Matamoros (Tamaulipas, México).
Banklaves: Concept for a Trustworthy Decentralized Payment Service for Bitcoin
Creators: name: Grundmann, Matthias
name: Leinweber, Marc
name: Hartenstein, Hannes
Publisher: name: Karlsruhe
Year: 2019

description: We explore challenges of and present a concept for a decentralized payment service which is based on trusted execution environments. The system guarantees that users can always cash out their funds without depending on the cooperation of other network members, hence minimizing the trust required in other network members. We present an overview of the system, motivate key components for a secure architecture and provide a communication protocol. We prove that the payment service users can cash out their funds at any time without any dependence on other network members.
Differentiating freely-moving from task-unrelated thought : the effects of motivation
Creators: name: Smith, Gabriel King
Publisher: name: University of British Columbia
Year: 2018

description: Freedom-of-movement in thought (the degree to which thought is constrained in its variety as opposed to being free to change) can be empirically dissociated from other well-studied dimensions of thought such as its task-unrelatedness in everyday life setting, but has yet to be studied in a controlled experimental environment. While there are several proposed mechanisms by which thought can become constrained (and therefore less freely moving), none have bene explored empirically. The present study set out to uncover which constructs associated with thought’s task-relatedness were also related to its freedom-of-movement and to test potential mechanisms of constraint. Motivation was within-subjects through a variable-value time-sensitive task and administered experience sampling probes asking participants to self-report the level of freely-moving thought, task-unrelated thought, deliberate control, arousal, and valence they were experiencing. Electrodermal activity and pupillometry were used as an index of physiological arousal in addition to self-reports. When participants were more highly motivated they reported having more constrained and more task-related thoughts, and having greater control over their thoughts. Control fully mediated motivation’s impact on freedom-of-movement of thought, but only partially mediated motivation’s impact on task-unrelated thought. Neither self-report or physiological measures of arousal were impacted by the manipulation, but high levels of both task-unrelated and freely-moving thought were associated with high ratings or self-reported arousal, higher pupillary responses to stimuli and smaller average pupil size, with freely-moving thought being uniquely associated with reduced skin conductance. Additionally, high freely-moving thought ratings were uniquely associated with slower responses, while high task-unrelated thought ratings were uniquely associated with low valence ratings. Overall, these findings support and further extend the previously identified dissociation between task-unrelatedness and freedom-of-movement as two separable dimensions of thought. They indicate that a person’s degree of control over their own thoughts is a crucial determinant of the content and especially the dynamics of that thought, but further work needs to be done to explore what nonconscious factors constrain thought movement.
Physical properties of the Sh2-104 HII region as seen by Herschel
Creators: name: Rodón, J. A.
name: Zavagno, A.
name: Baluteau, J. -P.
name: Anderson, L. D.
name: Polehampton, E.
name: Abergel, A.
name: Motte, F.
name: Bontemps, S.
name: Ade, P.
name: André, P.
name: Arab, H.
name: Beichman, C.
name: Bernard, J. -P.
name: Blagrave, K.
name: Boulanger, F.
name: Cohen, M.
name: Compiegne, M.
name: Cox, P.
name: Dartois, E.
name: Davis, G.
name: Emery, R.
name: Fulton, T.
name: Gry, C.
name: Habart, E.
name: Halpern, M.
name: Huang, M.
name: Joblin, C.
name: Jones, S. C.
name: Kirk, J.
name: Lagache, G.
name: Lin, T.
name: Madden, S.
name: Makiwa, G.
name: Martin, P.
name: Miville-Deschênes, M. -A.
name: Molinari, S.
name: Moseley, H.
name: Naylor, D.
name: Okumura, K.
name: Orieux, F.
name: Gonçalvez, D. Pinheiro
name: Rodet, T.
name: Russeil, D.
name: Saraceno, P.
name: Sidher, S.
name: Spencer, L.
name: Swinyard, B.
name: Ward-Thompson, D.
name: White, G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context: Sh2-104 is a Galactic H ii region with a bubble morphology, detected at optical and radio wavelengths. It is considered the first observational confirmation of the collect-and-collapse model of triggered star-formation. Aims: We aim to analyze the dust and gas properties of the Sh2-104 region to better constrain its effect on local future generations of stars. In addition, we investigate the relationship between the dust emissivity index β and the dust temperature, T_dust. Methods: Using Herschel PACS and SPIRE images at 100, 160, 250, 350 and 500 μm we determine T_dust and β throughout Sh2-104, fitting the spectral energy distributions (SEDs) obtained from aperture photometry. With the SPIRE Fourier transform spectrometer (FTS) we obtained spectra at different positions in the Sh2-104 region. We detect J-ladders of CO and 13CO, with which we derive the gas temperature and column density. We also detect proxies of ionizing flux as the [NII] 3P1-3P0 and [CI] 3P2-3P1 transitions. Results: We find an average value of β ~ 1.5 throughout Sh2-104, as well as a T dust difference between the photodissociation region (PDR, ~ 25 K) and the interior (~ 40 K) of the bubble. We recover the anti-correlation between β and dust temperature reported numerous times in the literature. The relative isotopologue abundances of CO appear to be enhanced above the standard ISM values, but the obtained value is very preliminary and is still affected by large uncertainties.
description: Accepted by A&A, to be published on the Herschel A&A Special Issue. 5 pages, 5 figures.
Term Graph Rewriting and Parallel Term Rewriting
Creators: name: Corradini, Andrea
name: Drewes, Frank
Publisher: name: arXiv
Year: 2011
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.4.2

description: The relationship between Term Graph Rewriting and Term Rewriting is well understood: a single term graph reduction may correspond to several term reductions, due to sharing. It is also known that if term graphs are allowed to contain cycles, then one term graph reduction may correspond to infinitely many term reductions. We stress that this fact can be interpreted in two ways. According to the "sequential interpretation", a term graph reduction corresponds to an infinite sequence of term reductions, as formalized by Kennaway et.al. using strongly converging derivations over the complete metric space of infinite terms. Instead according to the "parallel interpretation" a term graph reduction corresponds to the parallel reduction of an infinite set of redexes in a rational term. We formalize the latter notion by exploiting the complete partial order of infinite and possibly partial terms, and we stress that this interpretation allows to explain the result of reducing circular redexes in several approaches to term graph rewriting.
description: In Proceedings TERMGRAPH 2011, arXiv:1102.2268
Establishing The Role Of A Low Emulsifier Diet To Treat Crohn's Disease
Creators: name: Fitzpatrick, Jessica Wood
Publisher: name: Monash University
Year: 2025
Subjects: classificationCode: 321001
subject: Clinical nutrition
classificationCode: 320209
subject: Gastroenterology and hepatology

description: Emulsifiers, a group of food additives, have been implicated in the development of Crohn's disease by increasing intestinal permeability and inflammation. This thesis demonstrates, in the context of a healthy diet, they do not increase intestinal permeability or inflammation in healthy people. In contrast in people with active Crohn's disease, a healthy diet containing or not containing emulsifiers, reduces intestinal inflammation and improves patient reported outcomes.
Space programming requirements representation, analysis and visualization at a large scale architectural firm
Creators: name: Gebru, Helina Merkeb
Publisher: name: University of British Columbia
Year: 2018

description: Space programming is a primary task during the schematic design process, to produce a geometric configuration of a space layout that is in accordance with the project's requirements. By nature, space programming is an iterative process that evolves according to the client’s requirements. A critical challenge of space programming is the limitation in the link between the client’s requirements and design tools. The rigorous process of analyzing, structuring and extracting meaningful information often leads to requirements being overlooked or important requirements failing to be satisfied. Failure to meet the client’s space program requirements, could possibly lead to decline in the performance of the building, cost increase, client dissatisfaction and penalty fines charged by the client which are usually clearly stated in design contracts. This study adopted an observation-based empirical research approach to investigate the current practices and challenges of space program requirements data management, and design workflow at a large scale international architectural/engineering firm. Following the case study and recording challenges, I developed a smart Microsoft Excel® template to structure and parse a client’s space programming requirements data. This was essential to extract significant information such as the name of the rooms that have a proximity relationship requirement. This data was used to develop a dashboard to visualize space programming information and to validate the compliance of a building project’s space programming requirements in conjunction with a visual computational tool through a visual floor plan overlay. The developments were made to help designers extract space programming requirements in an automated manner and improve the iterative design process of space programming by automating visualizations to assess the compliance of space programs.
The complete conformal spectrum of a $sl(2|1)$ invariant network model and logarithmic corrections
Creators: name: Aufgebauer, Britta
name: Brockmann, Michael
name: Nuding, Win
name: Klümper, Andreas
name: Sedrakyan, Ara
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the low temperature asymptotics and the finite size spectrum of a class of Temperley-Lieb models. As reference system we use the spin-1/2 Heisenberg chain with anisotropy parameter $Δ$ and twisted boundary conditions. Special emphasis is placed on the study of logarithmic corrections appearing in the case of $Δ=1/2$ in the bulk susceptibility data and in the low-energy spectrum yielding the conformal dimensions. For the $sl(2|1)$ invariant 3-state representation of the Temperley-Lieb algebra with $Δ=1/2$ we give the complete set of scaling dimensions which show huge degeneracies.
description: 18 pages, 5 figures
Galilean currents and charges
Creators: name: Nicolis, Alberto
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We derive the Noether currents and charges associated with an internal galilean invariance---a symmetry recently postulated in the context of so-called galileon theories. Along the way we clarify the physical interpretation of the Noether charges associated with ordinary Galileo- and Lorentz-boosts.
description: 5 pages
Rule-based transformations for geometric modelling
Creators: name: Bellet, Thomas
name: Arnould, Agnès
name: Gall, Pascale Le
Publisher: name: arXiv
Year: 2011
Subjects: subject: Graphics (cs.GR)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences
subject: I.3.5; G.2.2

description: The context of this paper is the use of formal methods for topology-based geometric modelling. Topology-based geometric modelling deals with objects of various dimensions and shapes. Usually, objects are defined by a graph-based topological data structure and by an embedding that associates each topological element (vertex, edge, face, etc.) with relevant data as their geometric shape (position, curve, surface, etc.) or application dedicated data (e.g. molecule concentration level in a biological context). We propose to define topology-based geometric objects as labelled graphs. The arc labelling defines the topological structure of the object whose topological consistency is then ensured by labelling constraints. Nodes have as many labels as there are different data kinds in the embedding. Labelling constraints ensure then that the embedding is consistent with the topological structure. Thus, topology-based geometric objects constitute a particular subclass of a category of labelled graphs in which nodes have multiple labels.
description: In Proceedings TERMGRAPH 2011, arXiv:1102.2268
Multiple colon perforations as a presentation of Crohn's disease. A case report
Creators: name: Porfirio Martinez Vargas M.D.
name: Araceli Hernandez Vargas M.D.
name: Evelyn Contreras Jurado M.D.
name: Giselle Sanchez Vargas M.D.
Publisher: name: Zenodo
Year: 2025

description: Background:

We present the case of a 24-year-old male who only reports a history of regular inhaled cannabis use for the past two years and parenteral cocaine administration twice a month for the past year. He came to the emergency department with abdominal pain of one week's evolution, which reached the shock area with blood pressure: 90/60, heart rate 125 beats per minute, respiratory rate 24, temperature of 39 ° with data of systemic inflammatory response as well as data on the physical examination of acute abdomen, he underwent an urgent exploratory laparotomy identifying 6 perforations up to 1 cm in diameter at the level of the hepatic flexure of the colon and transverse hemicolon, without involvement of the ileum or appendix, for which a right hemicolectomy with terminal ileostomy was performed, the piece was sent to the pathology service who reported: Severely active chronic colitis with transmural inflammation and fissured ulcers, complicated with perforation at the level of the hepatic flexure of the colon and transverse hemicolon, characteristics compatible with Crohn's colitis, patient who had an adequate postoperative course, with management of abdominal sepsis and who was discharged on the tenth day after his intervention, A literature review is being conducted because Crohn's disease only affects 1-3% of the colon and presents as perforation much more rarely. Likewise, an attempt will be made to identify the association of this evolution with cannabis use in the literature.

 

Keywords: Chron’s disease, colonic perforation.
Self-Similar Modes of Coherent Diffusion
Creators: name: Firstenberg, O.
name: London, P.
name: Yankelev, D.
name: Pugatch, R.
name: Shuker, M.
name: Davidson, N.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Self-similar solutions of the coherent diffusion equation are derived and measured. The set of real similarity solutions is generalized by the introduction of a nonuniform phase surface, based on the elegant Gaussian modes of optical diffraction. In an experiment of light storage in a gas of diffusing atoms, a complex initial condition is imprinted, and its diffusion dynamics is monitored. The self-similarity of both the amplitude and the phase pattern is demonstrated, and an algebraic decay associated with the mode order is measured. Notably, as opposed to a regular diffusion spreading, a self-similar contraction of a special subset of the solutions is predicted and observed.
description: 10 pages, 5 figures