cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Modeling stellar Ca II H & K emission variations. I. Effect of inclination on the S-index
Creators: name: Sowmya, K.
name: Shapiro, A. I.
name: Witzke, V.
name: Nèmec, N. -E.
name: Chatzistergos, T.
name: Yeo, K. L.
name: Krivova, N. A.
name: Solanki, S. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The emission in the near ultraviolet Ca II H & K lines is modulated by stellar magnetic activity. Although this emission, quantified via the S-index, has been serving as a prime proxy of stellar magnetic activity for several decades, many aspects of the complex relation between stellar magnetism and Ca II H & K emission are still unclear. The amount of measured Ca II H & K emission is suspected to be affected not only by the stellar intrinsic properties but also by the inclination angle of the stellar rotation axis. Until now such an inclination effect on S-index has remained largely unexplored. To fill this gap, we develop a physics-based model to calculate S-index, focusing on the Sun. Using the distributions of solar magnetic features derived from observations together with Ca II H & K spectra synthesized in non-local thermodynamic equilibrium, we validate our model by successfully reconstructing the observed variations of solar S-index over four activity cycles. Further, using the distribution of magnetic features over the visible solar disk obtained from surface flux transport simulations, we obtain S-index time series dating back to 1700 and investigate the effect of inclination on S-index variability, both on the magnetic activity cycle and the rotational timescales. We find that when going from an equatorial to a pole-on view, the amplitude of S-index variations decreases weakly on the activity cycle timescale and strongly on the rotational timescale (by about 22% and 81%, respectively, for a cycle of intermediate strength). The absolute value of S-index depends only weakly on the inclination. We provide analytical expressions that model such dependencies.
description: 23 pages, 13 figures in the main body and 2 in the appendix, accepted for publication in ApJ
Review of Dave Tompkins. 2010. How to Wreck a Nice Beach. Chicago and Brooklyn: Stop Smiling/Melville House. Steve Goodman. 2010. Sonic Warfare. Cambridge, MA, and London: MIT Press.
Creators: name: Marshall, Wayne
Publisher: name: Current Musicology
Year: 2010

description: At first glance, Dave Tompkins’s How to Wreck a Nice Beach and Steve Goodman’s Sonic Warfare would seem to have a lot in common. Both books feature the creative “abuse” of military technology by musicians, an abiding appreciation for Afro-sonic futurisms, prose styles at times so idiosyncratic as to be arcane, and brief but key appearances by William Burroughs. Both also depart, whether implicitly or explicitly, from the general preoccupation with form still guiding the musicological status quo. This formalist bias affects both how we tend to listen as well as how we write. Instead, these books, each in their own way, propose novel and provocative modes of grappling with and making sense (or nonsense) of music and sound.
description: Current Musicology, No 90 (2010): Current Musicology
Transit-Time Spin Field-Effect-Transistor
Creators: name: Appelbaum, Ian
name: Monsma, Douwe
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We propose and analyze a four-terminal metal-semiconductor device that uses hot-electron transport through thin ferromagnetic films to inject and detect a charge-coupled spin current transported through the conduction band of an arbitrary semiconductor. This provides the possibility of realizing a spin field-effect-transistor in Si, using electrostatic transit-time control in a perpendicular magnetic field, rather than Rashba effect with spin-orbit interaction.
A new generation of cable grade poly(vinyl chloride) containing heavy metal free modifier
Creators: name: I.Al-Mosawi, Ali
Publisher: name: figshare
Year: 2021
Subjects: subject: 91299 Materials Engineering not elsewhere classified
subject: FOS: Materials engineering

description: Many additives are used to improve the performance of cables in terms of increasing their flame retardancy, thermal stability, thermal conductivity, and other characteristics. Unfortunately, most of these additives contain heavy metals. Therefore, the main objective of this study is to introduce a material representing a new generation of environmentally friendly heavy metal-free stabilizers for cable grade poly(vinyl chloride) that can compete with traditional materials in terms of performance and distinctive properties. This unique additive is Oxydtron, a synthetic silicate or simply nanocement. The tests performed are rheological properties represented by a capillary rheometry analysis, limiting oxygen index, and volume resistivity. The most significant improvement in Bagley correction measurements was 14.61%; 18.13%; and 27.20% more than poly(vinyl chloride) basic formulation when using 5wt.% Oxydtron at 160°C, 170°C, and 180°C, respectively. Also, the mean increases in relaxation time were 3.200 times, 8.825 times, and 12.458 times more than poly(vinyl chloride) basic formulation with 1wt.%, 3wt.%, and 5wt.% of Oxydtron, respectively. Furthermore, the Oxydtron lowered the value of the accompanying thermal gradient of the L.O.I test, reducing the heat-affected zone. The best result was with the extrusion processing method due to the uniformity of the processing conditions. However, the thermal gradient analysis showed residual heat stress in the test samples after cutting the burning layer and re-testing the samples again; this causes them to burn faster. This situation requires caution for designs that are exposed to high temperatures without burning. The optimum improvement in volume resistivity value was 14.71% and 38.24% more than poly(vinyl chloride) basic formulation after adding 5wt.% and 7wt.% of Oxydtron, respectively.
Boosting Binary Masks for Multi-Domain Learning through Affine Transformations
Creators: name: Mancini, Massimiliano
name: Ricci, Elisa
name: Caputo, Barbara
name: Buló, Samuel Rota
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: In this work, we present a new, algorithm for multi-domain learning. Given a pretrained architecture and a set of visual domains received sequentially, the goal of multi-domain learning is to produce a single model performing a task in all the domains together. Recent works showed how we can address this problem by masking the internal weights of a given original conv-net through learned binary variables. In this work, we provide a general formulation of binary mask based models for multi-domain learning by affine transformations of the original network parameters. Our formulation obtains significantly higher levels of adaptation to new domains, achieving performances comparable to domain-specific models while requiring slightly more than 1 bit per network parameter per additional domain. Experiments on two popular benchmarks showcase the power of our approach, achieving performances close to state-of-the-art methods on the Visual Decathlon Challenge.
description: Accepted for publication by Machine Vision and Applications on May 21, 2020. arXiv admin note: substantial text overlap with arXiv:1805.11119
Diamphipnoa colberti Stark 2008, sp. n.
Creators: name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Diamphipnoidae
Diamphipnoa
Diamphipnoa colberti

description: Diamphipnoa colberti sp. n. (Figs. 1-6) Material examined. Holotype ♂ (pinned) from Chile, Maule, Pelluhue, along Rio Curanilahue, 26 November 2006, debu 00279411, S.A. Marshall (temporarily placed in the University of Guelph insect collection until a permanent depository in Chile can be arranged). Adult habitus. Occiput and anterior frons dark but pale around eyes and at antennal bases. Pronotum mostly dark but pale marginal areas of thorax with hint of red pigment (Fig. 1). Legs dark but with scattered oval pale spots and a narrow pale band at knee; tarsi black. Wings mottled. Cerci pale basally but dark in apical half. 4 Male. Forewing length 37 mm. Median apex of tergum 10 bearing a dark, U-shaped sclerite, prolonged on the caudal margin, and irregularly toothed along margin of tergum (Figs 2-3). Paraprocts apically bilobed and bearing 1 (right side) or 2 (left side) anterior spines (Figs. 2, 6); posterior margin of paraproct with a small, semicircular toothed sclerite bearing ca. 10 minute teeth. Epiproct apex shaped somewhat like the pistil of a flower with tip slightly expanded and notched in dorsal aspect, and bent caudad at a 90 ° angle in lateral aspect (Figs. 2-5); basal supports bear ca. 8-10 irregular teeth along dorsal margin and base of epiproct apex bears a single, median tooth which projects over basal supports. Female. Unknown. Larva. Unknown. Etymology. I am pleased to honor an entertaining, provocative, former American presidential candidate, Stephen Colbert, of The Colbert Report with this patronym. Diagnosis. This species is distinguished from other Diamphipnoa by the enlarged and notched dorsal aspect of the epiproct apex. All known species have the tips rounded and lateral margins near the tip parallel.
description: Published as part of Stark, Bill P., 2008, Diamphipnoa Colberti, A New Stonefly Species From Chile, And The Possible Female Of Diamphipnopsis Beschi Illies (Plecoptera: Diamphipnoidae), pp. 55-58 in Illiesia 4 (4) on pages 55-57, DOI: 10.5281/zenodo.4758933
Review of Brandon LaBelle. 2010. Acoustic Territories: Sound Culture and Everyday Life. New York and London: Continuum
Creators: name: Fishbeck, Luke
Publisher: name: Current Musicology
Year: 2010

description: Over the book’s course, LaBelle amply demonstrates how much about the acoustic paradigm can be read into this simple (silent) interaction: how sound- and listening- attaches us to one another and to our environments, and the ways in which these attachments are woven into the shared condition of the everyday. LaBelle intentionally blurs the already vague boundaries between “sound culture” and “sound art”. Acoustic Territories functions best as a proposal for a mode of listening, and that the consideration that “sounds begins and ends with noise”. In writing Acoustic Territories, LaBelle repositions sounds studies as radically engaged- a listening science with the potential reveal sound’s social materiality as it draws transformative meaning out of the background noise of the everyday.
description: Current Musicology, No 90 (2010): Current Musicology
A 33 hour period for the Wolf-Rayet/black hole X-ray binary candidate NGC 300 X-1
Creators: name: Carpano, S.
name: Pollock, A. M. T.
name: Prestwich, A.
name: Crowther, P.
name: Wilms, J.
name: Yungelson, L.
name: Ehle, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Context. NGC 300 X-1 is the second extragalactic candidate, after IC 10 X-1, in the rare class of Wolf-Rayet/compact object X-ray binary systems exemplified in the Galaxy by Cyg X-3. From a theoretical point of view, accretion onto a black hole in a detached system is possible for large orbital periods only if the mass of the relativistic object is high or the velocity of the accreted wind is low. Aims. We analysed a 2 week SWIFT XRT light curve of NGC 300 X-1 and searched for periodicities. Methods. Period searches were made using Lomb-Scargle periodogram analysis. We evaluated the confidence level using Monte Carlo simulations. Results. A period of 32.8+-0.4h (3 sigma error) was found for NGC 300 X-1 with a confidence level >99%. Furthermore, we confirm the high irregular variability during the high flux level, as already observed in the XMM-Newton observations of the source. A folded XMM-Newton light curve is shown, with a profile that is in agreement with SWIFT. The mean absorbed X-ray luminosity in the SWIFT observations was 1.5x10^38 erg/s, close to the value derived from the XMM-Newton data. Conclusions. While Cyg X-3 has a short period of 4.8 h, the period of NGC 300 X-1 is very close to that of IC 10 X-1 (34.8+-0.9 h). These are likely orbital periods. Possibility of formation of accretion disk for such high orbital periods strongly depends on the terminal velocity of the Wolf-Rayet star wind and black-hole mass. While low masses are possible for wind velocities < 1000 km/s, these increase to several tens of solar masses for velocities > 1600 km/s and no accretion disk may form for terminal velocities larger than 1900 km/s.
description: 4 pages, 6 figures, accepted as a Letter in Astronomy & Astrophysics. Figure 6 will appear with a better quality in the A&A paper
DIGITAL TRANSFORMATION IN DEVELOPING COUNTRIES: EMPLOYEE PERSPECTIVE OF THE PUBLIC SECTOR
Creators: name: AFNAN ALRFOOH
name: ALI ALJAAFREH
name: YEHIA IBRAHIM ALZOUBI
Publisher: name: Zenodo
Year: 2023
Subjects: Digital transformation, Greater Amman Municipality, TOE framework, COVID-19.

description: Abstract

In recent years, digital transformation has emerged as a phenomenon that contributes to the transition from the industrial age to the age of smart and connected things. Which had a significant impact on organizations and society. This research aims to identify the factors affecting digital transformation in Jordanian government institutions from the point of view of workers in the Greater Amman Municipality. The research model consists of the Technology Use - Regulation - Environment (TOE) framework, Diffusion Innovation Theory (DOI). Two factors were also added to the research model (self-efficacy and perceived risk of Covid -19). The search was conducted in the Greater Amman Municipality, where (413) questionnaires were returned, 365 of which were accepted for analysis. The Statistical Package for Social Sciences (SPSS) was used to identify and explain the main determinants that affect digital transformation. The results showed that the factors “comparative advantages, IT infrastructure, organizational culture, senior management support, staff development and training” had a significant positive impact on DT. The results also indicated that the factors “compatibility, self-efficacy, and perceived risk of Covid-19” did not have a significant impact on digital transformation. Accordingly, the researcher presented a number of recommendations to decision makers that would positively affect and increase digital transformation in the Greater Amman Municipality.
La «Sonate pour Violon et Piano» di Claude Debussy: relazioni fra testimoni, edizioni d’uso e volontà d’autore
Creators: name: Paolone, Francesco
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2005

description: Philomusica on-line, Vol 4, N° 1 (2005): Annata 2004-2005
Intensity Moments of a Laser Beam Formed by Superposition of Hermite-Gaussian Modes
Creators: name: Bekshaev, A. Ya.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Expressions are obtained for the Wigner function moments of a paraxial light beam represented by arbitrary coherent superposition of Hermite-Gaussian beams with plane wave fronts. Possibilities are discussed for application of the obtained results to modeling real laser beams and to design of optical systems implementing prescribed transformations of a beam transverse structure.
description: 13 pages, 1 figure. This is a translation of a paper published in Russian in 1998. It contains some mathematical formulas which seemed then to be of limited interest but in the last year I had to refer to it several times and readers of my articles ask me to send them this paper. Therefore I ask to place it in this database. During the translation I did not change the main body of the paper, only added some comments in footnotes and corresponding literature references [10 - 14]
Datasets of the solar quiet (Sq) and solar disturbed (SD) variations of the geomagnetic field from the mid latitudinal Magnetic Observatory of Coimbra (Portugal) obtained by different methods
Creators: name: Morozova, Anna
name: Rebbah, Rania
name: Ribeiro, Paulo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Here we present datasets of daily variation obtained from the geomagnetic field raw observations recorded at the Coimbra Magnetic Observatory (COI, Portugal) in 2007-2017, covering almost the entire solar cycle 24. Two methods were used to extract daily variability from the raw geomagnetic hourly data. The first method uses the so-called geomagnetically quiet days to calculate S-type variations as daily means resulting in the data sub-set named IQD Sq and SD. The second method uses the principal component analysis (PCA) to decompose the original series into main variability modes. The first three modes produced by PCA and explaining up to 98 per cent of the variability of the raw data are in the data sub-set named PCA modes. Both methods allow to extract regular geomagnetic field variations related to daily variations (S-type variations) in the ionospheric dynamo region and some magnetospheric currents. The COI location near the mean latitude of the ionospheric Sq current vortex focus allows studying its variability using the S-type regular variations of the geomagnetic field measured near the ground. The S-type variations for the X and Y components of the geomagnetic field obtained at the COI observatory can also be re-scaled and used to analyze field variations obtained at other European geomagnetic observatories at close latitudes. The S-type variations for the Z component of the geomagnetic field obtained at the COI observatory can be compared to similar variations observed at more continental regions to study the so-called coastal effect in the geomagnetic field variations. The dataset described in this paper is analyzed in a companion paper Comparison of the solar variations of the geomagnetic field at the Coimbra Magnetic Observatory (COI) obtained by different methods: effect of the solar and geomagnetic activity by A. Morozova and R. Rebbah submitted to ASR.
description: to be submitted to Data in Brief
Femtosecond laser pulse compression
Creators: name: Chin, Roger S.
Publisher: name: University of British Columbia
Year: 2010

description: Once the Spectra-Physics Femtosecond Laser System had arrived, it had to be characterized. For further pulse compression, various techniques had to be considered. The best of these were chosen considering our needs and limitations. First, the Spectra-Physics Femtosecond Laser System is described and its 616 nm laser pulses are characterized. By using an autocorrelation technique based on the nonlinear optical characteristics of a potassium dihydrogen phosphate (KDP) crystal and assuming a particular intensity pulse shape (such as that described by a symmetric exponential decay), the pulse width (full width at half maximum) could be obtained. Assuming a pulse shape described by a symmetric exponential decay function, the "exponential" pulse width was measured to be 338 ± 6 fs. The nominal average power of the 82-MHz modelocked pulse train was 225 mW. The "exponential" pulse energy was 2.7 nJ with a peak pulse power of 2.8 kW. Theoretical calculations for fibre grating pulse compression are presented. Experimentally, I was able to produce 68 ± 1 fs (exponential) pulses at 616 nm. The average power was 55 mW. The "exponential" pulse energy was 0.67 nJ with a peak power of 3.4 kW. The pulse compressor consisted of a 30.8 ±0.5 cm fibre and a grating compressor with the effective grating pair distance of 103.8 ± 1 cm. Various techniques were considered for further pulse compression. Fibre-grating pulse compression and hybrid mode locking appeared to be the most convenient and least expensive options while yielding moderate results. The theory of hybrid mode locking is presented. Experimentally, it was determined that with the current laser system tuned to 616 nm, DODCI is better than DQOCI based on pulse shape, power, stability and expense. The recommended DODCI concentration is 2-3 mmol/l. The shortest "exponential" pulse width was 250 fs. The average power was 185 mW. The exponential pulse energy was 2.3 nJ with a peak pulse power of 2.6 kW. An attempt to increase the bandwidth of the laser pulse by replacing the one-plate birefringent plate with a pellicle severely limited the tunability of the dye laser and introduces copious noise. Attempts to reduce group velocity dispersion (responsible for pulse broadening) with a grating compressor was indeterminate, but did result in a slightly better pulse shape. Interferometric autocorrelation is recommended for such a study. An increase or decrease from the nominal power output of the pulse compressor showed a decrease in pulse compression.
CT Based Semi-Automated Method for Pneumonia Severity in Mice
Creators: name: Johri, Ansh
name: Hsu, Lewis
Publisher: name: Columbia Undergraduate Science Journal
Year: 2011

description: Misdiagnosis of community-acquired pneumonia is an important clinical problem, leading to a high rate of mortality. Diagnoses are typically conducted using two-dimensional chest x-rays, which have shown to be time-consuming and inaccurate. In an effort to improve the current diagnostic method, we utilized Micro-Computed Tomography (MicroCT) and image analysis software to develop a diagnostic algorithm that can quantitatively assess the severity of pneumonia in mice. We believed this method would provide more immediate, precise, and accurate diagnoses as opposed to the qualitative assessments done by radiologists at present, because MicroCT provides opportunities for non-invasive radiographic endpoints for pneumonia studies. A quantitative scoring of previously obtained Computed Tomography (CT) scans of pneumonia infected and control mice lungs was developed with a semi-automated image segmentation algorithm. At the endpoint of 168 hours, each of the mice was categorized as either a) a Saline (control)-injected mouse (total=13), a Pneumonia-injected Survivor (total=11), or a Pneumonia-injected Non-survivor (total=11). Three comparison tests were then completed, including Saline vs. All Pneumonia Injected Mice, Pneumonia Survivors vs. Pneumonia Non-survivors, and All Survivors (both Saline & Pneumonia) vs. Pneumonia Non-survivors. In all three comparisons, the semi-automated algorithm was better able to distinguish between the different groups than radiologists using two-dimensional chest x-rays of the mice’s lungs, with p-values of 0.001, 0.039, and 0.001 for the semi-automated algorithm, and 0.004, 0.581, 0.058 for the radiologists, respectively. Key Words: Community-acquired pneumonia, Computed Tomography
description: Columbia Undergraduate Science Journal, Vol 5 (2011): Spring 2011
Surgery formulae for finite type invariants of rational homology 3--spheres
Creators: name: Lescop, Christine
Publisher: name: arXiv
Year: 2007
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M27; 57N10; 57M25; 55R80

description: We first present three graphic surgery formulae for the degree $n$ part $Z_n$ of the Kontsevich-Kuperberg-Thurston universal finite type invariant of rational homology spheres. Each of these three formulae determines an alternate sum of the form $$\sum_{I \subset N} (-1)^{\sharp I}Z_n(M_I)$$ where $N$ is the set of components of a framed algebraically split link $L$ in a rational homology sphere $M$, and $M_I$ denotes the manifold resulting from the Dehn surgeries on the components of $I$. The first formula treats the case when $L$ is a boundary link with $n$ components, while the second one is for $3n$--component algebraically split links. In the third formula, the link $L$ has $2n$ components and the Milnor triple linking numbers of its 3--component sublinks vanish. The presented formulae are then applied to the study of the variation of $Z_n$ under a $p/q$-surgery on a knot $K$. This variation is a degree $n$ polynomial in $q/p$ when the class of $q/p$ in $\QQ/\ZZ$ is fixed, and the coefficients of these polynomials are knot invariants, for which various topological properties or topological definitions are given.
description: 51 pages, uses pstricks
Transitions between distinct compaction regimes in complexes of multivalent cationic lipids and DNA
Creators: name: Farago, Oded
name: Ewert, Kai
name: Ahmad, Ayesha
name: Evans, Heather M.
name: Grønbech-Jensen, Niels
name: Safinya, Cyrus R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: We use X-ray scattering and molecular simulations to investigate the structural properties of complexes of multivalent cationic lipids and DNA molecules. At low mole fraction of neutral lipids (NLs), $Φ_{\rm NL}$, the complexes show dramatic DNA compaction down to essentially close packed DNA arrays with a DNA interaxial spacing $d_{\rm DNA}=25Å$. A gradual increase in $Φ_{\rm NL}$ does not lead to a continuous increase in $d_{\rm DNA}$ as observed for DNA complexes of monovalent cationic lipids (CLs). Instead, distinct spacing regimes exist, with sharp transitions between them. Three packing states have been identified: (i) close packed, (ii) condensed, but not close packed, with $d_{\rm DNA}=27-28Å$, and (iii) an expanded state, where $d_{\rm DNA}$ increases gradually with $Φ_{\rm NL}$. Based on our experimental and computational results, we conclude that the DNA condensation is mediated by the multivalent cationic lipids, which assemble between the negatively charged DNA rods. Quite remarkably, the computational results show that the less tightly packed structure in regime (ii) is thermodynamically more stable than the close packed structure in regime (i). Accordingly, the constant DNA spacing observed in regime (ii) is attributed to lateral phase coexistence between this stable CL-DNA complex and neutral membranes. This finding may explain the reduced transfection efficiency measured for such complexes: Transfection involves endosomal escape and disassembly of the complex, and these processes are inhibited by the high thermodynamic stability. Our results, which demonstrate the existence of an inverse correlation between the stability and transfection activity of lamellar CL-DNA complexes are, therefore, consistent with a recently proposed model of cellular entry.
description: Accepted for publication in Biophys. J
Giornata di studio interdisciplinare «Musica e Immagine»
Creators: name: Anzolin, Luisa
name: Carone, Angela
name: Cecchi, Alessandro
name: Fornoni, Federico
name: Gennaro, Sara
name: Guido, Massimiliano
name: Gurrieri, Marco
Publisher: name: Pavia University Press - Edizioni dell'Università degli Studi di Pavia
Year: 2005

description: Philomusica on-line, Vol 4, N° 1 (2005): Annata 2004-2005
Study of lithium intercalation in titanium disulphide using time differential perturbed angular correlations
Creators: name: Surono, Djoko
Publisher: name: University of British Columbia
Year: 2010

description: Lithium intercalation into layered compound TiS₂ was studied using time-differential perturbed angular correlations (TDPAC). Fast electrochemical intercalation was performed to bring Li atoms into the host. The probe atoms ¹⁸¹ Hf registered two nuclear quadrupole interactions corresponding to the empty host TiS₂ with quadrupole frequency ⅴq₁=461(5) MHz and a high packing density LixTiS₂. (x≈l) compound with quadrupole frequency ⅴq₂=599(6) MHz. The contribution fractions of both interactions evolved as a function of charge transport, nF. The second intercalation becomes dominant at nF > 0.3. No evidence was found for intermediate x values.
Poliovirus Receptor CD155 Over-Expression Effect on Migration in C6 Glioma Cells
Creators: name: Bhaiwala, Zahra
name: Marshall, Christine
Publisher: name: Columbia Undergraduate Science Journal
Year: 2011

description: Cell migration plays a key role in brain cancer invasion, an early step in metastasis, and proteins that regulate migration are often up-regulated in tumor cells. The poliovirus receptor CD155 has recently been shown to affect migration levels of select malignant glioma strains, fueling the exploration of treating brain cancer with oncolytic virus recombinants. In the beginning phase of experimentation, we analyzed the migratory behavior of control C6 gliomas through two rounds of transfilter assays. In order to explore the function of CD155 in glioma migration, we then conducted two over-expression experiments with the use of a full-length cDNA expression vector and compared the resulting migration rates to control data. We found that an average of 304.25 control cells cross our transfilters after 5.5 hours, and an average of 354.5 cells transfected with the PVR expression vector. Our results reflected a 16.5% increase in cell migration due to an increased presence of the protein CD155. In order to confirm that CD155 was expressed in the rat C6s, we subsequently conducted two Western blots: one comparing control C6s and transfected C6s, and the other running control C6s next to a human U87 glioma control cell line. The blots establish that CD155 is indeed present in both of these human and rat strains of glioma, and that our over-expression was successful. Key words: Glioblastoma multiforme; tumor migration; poliovirus receptor CD155; protein over-expression.
description: Columbia Undergraduate Science Journal, Vol 5 (2011): Spring 2011
Main Sequence Companions to White Dwarfs: the Age-Metallicity relation
Creators: name: A. Rebassa-Mansergas
name: A. T. Knowles
name: R. Raddi
name: S. Torres
Publisher: name: Zenodo
Year: 2021
Subjects: other

description: The age-metallicity relation is a fundamental observational tool for constraining the chemical evolution of the Galactic disc in time. In this work we analyse the observational properties of this relation using binary stars consisting of a main sequence star -from which we can derive the metallicity- and a white dwarf -from which we can derive the total age of the system. Our sample consists of 49 wide WDMS binaries, identified within the Sloan Digital Sky Survey, that evolved avoiding mass transfer episodes. The 49 objects were observed with the VLT/X-Shooter and GTC/Osiris+EMIR telescopes/instruments.
description: Proyecto realizado con la Beca Leonardo a Investigadores y Creadores Culturales 2019 de la Fundación BBVA. La Fundación BBVA no se responsabiliza de las opiniones, comentarios y contenidos incluidos en el proyecto y/o los resultados derivados del mismo, los cuales son total y absoluta responsabilidad de sus autores.
Further Indications of Jet Rotation in New Ultraviolet and Optical HST/STIS Spectra
Creators: name: Coffey, Deirdre
name: Bacciotti, Francesca
name: Ray, Thomas P.
name: Eislöffel, Jochen
name: Woitas, Jens
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present survey results which suggest rotation signatures at the base of T-Tauri jets. Observations were conducted with the Hubble Space Telescope Imaging Spectrograph at optical and near ultraviolet wavelengths (NUV). Results are presented for the approaching jet from DG Tau, CW Tau, HH 30 and the bipolar jet from TH 28. Systematic asymmetries in Doppler shift were detected across the jet, within 100 AU from the star. At optical wavelengths, radial velocity differences were typically 10 to 25 (+/-5) km/s, while differences in the NUV range were consistently lower at typically 10 (+/-5) km/s. Results are interpreted as possible rotation signatures. Importantly, there is agreement between the optical and NUV results for DG Tau. Under the assumption of steady magnetocentrifugal acceleration, the survey results lead to estimates for the distance of the jet footpoint from the star, and give values consistent with earlier studies. In the case of DG Tau, for example, we see that the higher velocity component appears to be launched from a distance of 0.2 to 0.5 AU from the star along the disk plane, while the lower velocity component appears to trace a wider part of the jet launched from as far as 1.9 AU. The results for the other targets are similar. Therefore, if indeed the detected Doppler gradients trace rotation within the jet then, under the assumption of steady MHD ejection, the derived footpoint radii support the existence of magnetized disk winds. However, since we do not resolved the innermost layers of the flow, we cannot exclude the possibility that there also exists an X-wind or stellar wind component.
description: 22 pages, 21 figures, accepted by The Astrophysical Journal
Review of Alejandro L. Madrid. 2008. Nor-tec Rifal: Electronic Dance Music from Tijuana to the World. Oxford: Oxford University Press
Creators: name: Mueller, Gavin
Publisher: name: Current Musicology
Year: 2010

description: The burgeoning field of electronic dance music (EDM) scholarship has drawn from a number of theoretical and methodological perspectives. In particular, the disciplinary melange that is cultural studies, whose rise in academia coincided with EDM’s rise in popular music during the 1980’s and 90’s, has proven an effective tool for researches seeking to understand the social world and political and economic contexts in which EDM sounds and styles arise. This book’s purported object of analysis- a Tijuana based scene knit together through aesthetic practices rooted in the appropriation of the sounds and images of northern Mexico- is appropriately conceptualized for a cultural studies approach.
description: Current Musicology, No 90 (2010): Current Musicology
Review of Joanna Demers. 2010. Listening Through the Noise: The Aesthetics of Experimental Electronic Music. Oxford, UK: Oxford University Press. Nick Collins and Julio d’Escriván. 2007. The Cambridge Companion to Electronic Music. Cambridge, UK: Cambridg
Creators: name: Polymeropoulou, Marilou
Publisher: name: Current Musicology
Year: 2010

description: In Listening Through the Noise, Demers presents an aesthetic theory of experimental electronic music accompanied by audio examples which can be found online. In The Cambridge Companion to Electronic Music (CCTEM), electronic music and technology’s influence on 20th and 21st century music making is discussed, as well as how the history of electronic music is based on perspectives by composers and scholars from a variety of disciplines, including communication studies, musicology, visual arts, music technology, psychology of music, and computer science. Both books define electronic music as organized sounds generated by electronic circuits, which may be part of musical instruments, computers, or nay electronic equipment. Taken together, the Listening Through the Noise, and the CCTEM can be used to understand many different approaches, problems, questions, and aims regarding electronic music in a social, cultural and historical context, while also addressing its standing point in music.
description: Current Musicology, No 90 (2010): Current Musicology
The impact of meridional circulation on stellar butterfly diagrams and polar caps
Creators: name: Holzwarth, V.
name: Mackay, D. H.
name: Jardine, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Observations of rapidly rotating solar-like stars show a significant mixture of opposite-polarity magnetic fields within their polar regions. To explain these observations, models describing the surface transport of magnetic flux demand the presence of fast meridional flows. Here, we link sub-surface and surface magnetic flux transport simulations to investigate (i) the impact of meridional circulations with peak velocities of <125m/s on the latitudinal eruption pattern of magnetic flux tubes and (ii) the influence of the resulting butterfly diagrams on polar magnetic field properties. Prior to their eruption, magnetic flux tubes with low field strengths and initial cross sections below about 300km experience an enhanced poleward deflection through meridional flows. In particular flux tubes which originate between low and intermediate latitudes within the convective overshoot region are strongly affected. This latitude-dependent poleward deflection of erupting magnetic flux renders the wings of stellar butterfly diagrams distinctively convex. The subsequent evolution of the surface magnetic field shows that the increased number of newly emerging bipoles at higher latitudes promotes the intermingling of opposite polarities of polar magnetic fields. The associated magnetic flux densities are about 20% higher than in the case disregarding the pre-eruptive deflection, which eases the necessity for fast meridional flows predicted by previous investigations. In order to reproduce the observed polar field properties, the rate of the meridional circulation has to be on the order of 100m/s, and the latitudinal range from which magnetic flux tubes originate at the base of the convective zone (<50degrees) must be larger than in the solar case (<35degrees).
description: 15 pages, 12 figures, accepted for publication by MNRAS
In the Kitchens of '68. The Impact of Student Protest and Counter-Culture on Attitudes Towards Food'
Creators: name: Tolomelli Marica
Publisher: name: Zenodo
Year: 2019
Subjects: student protest
eating habits
slow food
nouvelle cuisine

description: Among the big issues of the 1968 movement, food patently figured not at all. But in many ways it was a very political topic. Deep criticism of consumerism turned into criticism of production, preparation and consumption of foodstuffs. Eating spaces and manners were subverted, along with traditional gastronomic canons and meal structures. Young people travelling and living in communes discovered new foods and recipes by cooking together, while discovering a new relation to more natural ingredients. On the one hand, the critique of conventions and conservative habits led to experimental practices in the field of both cooking and eating. On the other, the critique of industrial civilization and protest against the consumerism induced by a capitalist economy – including the consumption of industrially processed food – encouraged the ‘discovery’ of a new, more authentic relation to nature and genuine products. Thus a new kind of food heritage took shape in various ways: from Nouvelle cuisine to a new appreciation of ‘natural’ food in Berkeley, to the Slow Food Movement which emerged twenty years later.
Vortex Core Structure in Neutral Fermion Superfluids with Population Imbalance
Creators: name: Takahashi, M.
name: Mizushima, T.
name: Ichioka, M.
name: Machida, K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Quantized vortex core structure is theoretically investigated in Fermion superfluids with population imbalance for two atom species of neutral atom clouds near a Feshbach resonance. In contrast with vortex core in balance case where the quantum depletion makes a vortex visible through the density profile measurement, the vortex core is filled in and becomes less visible because the quantized discrete bound states are occupied exclusively by the majority species. Yet it is shown that the core can be visible through the minority density profile experiment using phase contrast imaging, revealing an interesting opportunity to examine low-lying Fermionic core bound states unexplored so far.
description: 5 pages, 5 figures, replaced by the version to appear in PRL
Cosmological implications of the anisotropy of ten galaxy cluster scaling relations
Creators: name: Migkas, K.
name: Pacaud, F.
name: Schellenberger, G.
name: Erler, J.
name: Nguyen-Dang, N. T.
name: Reiprich, T. H.
name: Ramos-Ceja, M. E.
name: Lovisari, L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The hypothesis that the late Universe is isotropic and homogeneous is adopted by most cosmological studies. The expansion rate $H_0$ is thought to be spatially constant, while bulk flows are often presumed to be negligible compared to the Hubble expansion, even at local scales. Their effects on the redshift-distance conversion are hence usually ignored. Any deviation from this consensus can strongly bias the results of such studies and thus the importance of testing these assumptions cannot be understated. Scaling relations of galaxy clusters can be effectively used for that. In previous works, we observed strong anisotropies in cluster scaling relations, whose origins remain ambiguous. By measuring many different cluster properties, several scaling relations with different sensitivities can be built. Nearly independent tests of cosmic isotropy and bulk flows are then feasible. We make use of up to 570 clusters with measured properties at X-ray, microwave, and infrared wavelengths, to construct 10 different cluster scaling relations (five of them presented for the first time) and test the isotropy of the local Universe. Through rigorous tests, we ensure that our analysis is not prone to generally known systematic biases and X-ray absorption issues. By combining all available information, we detect an apparent $9\%$ spatial variation in the local $H_0$ between $(l,b)\sim ({280^{\circ}}^{+35^{\circ}}_{-35^{\circ}},{-15^{\circ}}^{+20^{\circ}}_{-20^{\circ}})$ and the rest of the sky. The observed anisotropy has a nearly dipole form. Using Monte Carlo simulations, we assess the statistical significance of the anisotropy to be $>5σ$. This result could also be attributed to a $\sim 900$ km/s bulk flow which seems to extend out to at least $\sim 500$ Mpc. These two effects are indistinguishable until more high$-z$ clusters are observed by future all-sky surveys, such as eROSITA.
description: Accepted in A&A (29 pages and 13 plots, plus Appendix)
Country-Level Research Review: EdTech in Ghana
Creators: name: Tsapali, Maria
name: Major, Louis
name: Damani, Kalifa
name: Mitchell, Joel
name: Taddese, Abeba
Publisher: name: EdTech Hub
Year: 2021
Subjects: Educational technology
Ghana
Research review

description: This document presents a review of the research landscape in Ghana in relation to EdTech research focused at the level of school-based education (not including higher education). The search strategy identified research literature, policy documents, grey literature, and communications with key experts and stakeholders. A growing body of relevant EdTech research is identified to have been undertaken in Ghana. After undertaking searches for relevant literature since 2007, 132 research articles or papers were identified for inclusion. The review provides an overview of trends in this literature in addition to identifying key actors and projects. It also considers how existing research on EdTech in Ghana relates to five research topics that will be the focus of future EdTech Hub research. In combination with political economy analysis, the research identifies potential areas for new research which would be practical and likely to have high impact.
Electron thermal escape in the Sun
Creators: name: Bommier, V.
Publisher: name: Zenodo
Year: 2021
Subjects: The Sun and the Heliosphere
electrons
electric fields
magnetic fields
Sun internal structure
solar-type star internal structure

description: Magnetic field vector observations in the solar photosphere have generally revealed a non-zero value of the divergence: the vertical field component gradient is found on the order of 3 G/km when the horizontal field component gradient is of 0.3 G/km only. This has first to be assigned to the fact that the measured quantity is the magnetic field H, which is related to the divergence-free magnetic induction B by the law B=µ0(H+M), where M is the magnetization. In plasmas like the solar photosphere, magnetization results from plasma diamagnetism and spiral movement of charged particles about the magnetic field. The usually admitted but very indirect electron density leads to weak magnetization. However, it can be observed that in the solar interior the electron thermal velocity is much larger than the escape velocity. The attractive effect of the protons does not completely prevent the electrons from escaping. A model of this will be presented. The electrons escape from lower layers in a quasi-static spreading, and accumulate in the photosphere. Therefore, the electron density at surface is increased but decreases with height at surface, which enables the observed values because divH = -divM. Such a structure is probably at play in the solar-type stars.
description: {"references": ["Bommier, V., 2020, A&A, 634, A40, https://doi.org/10.1051/0004-6361/201935244"]}
Diamphipnopsis beschi Illies 1960
Creators: name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Diamphipnoidae
Diamphipnopsis
Diamphipnopsis beschi

description: Diamphipnopsis beschi Illies (Figs. 7-8) Diamphipnopsis beschi Illies, 1960:695. Holotype ♂ (Limnologische Flussstation, Schlitz). Pillaifa-Bergbach, Province Valdivia, Chile Material examined. Chile: X Region, Oncol P. Boniface Way, 606 m, 39 ° 41.979’ S, 73 ° 18.938’ W, 8 January 2007, Arias et al., 1 ♀ (University of California, Berkeley). Adult habitus. General color grayish black with greenish background. Head dark over central frons and much of occiput (Fig.7); pronotum greenish with irregular dark markings on disk. Wing membrane pale with greenish tint and brown veins; margins with brown spots at ends of many veins. Legs greenish with scattered dark blotches. Putative Female. Forewinglength 25 mm. Subgenital plate truncate along posterior margin with no hint of notch. Area surrounding plate membranous and without setae, but posterior margin of sternum 8 with a sparse field of fine setae (Fig. 8). Remarks. The basis for this species assignment are: 1) the subgenital plate is truncate rather than notched as shown for D. samali by Illies (1960), and 2) the forewing length is only 25 mm whereas Illies (1960) reports a range of 36-45 mm for D. samali. This specimen may still represent an atypical D. samali or an undescribed member of the genus. Additional specimens are needed to allow an evaluation of the status of this population.
description: Published as part of Stark, Bill P., 2008, Diamphipnoa Colberti, A New Stonefly Species From Chile, And The Possible Female Of Diamphipnopsis Beschi Illies (Plecoptera: Diamphipnoidae), pp. 55-58 in Illiesia 4 (4) on pages 57-58, DOI: 10.5281/zenodo.4758933
description: {"references": ["Illies, J. 1960. Archiperlaria, eine neue Unterordnung der Plecopteren. (Revision der Familien Eustheniidae und Diamphipnoidae) (Plecoptera). Beitrage zur Entomologie, 10: 661 - 697."]}
Generalized Phase Space Representation of Operators
Creators: name: Klauder, John R.
name: Skagerstam, Bo-Sture K.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Introducing asymmetry into the Weyl representation of operators leads to a variety of phase space representations and new symbols. Specific generalizations of the Husimi and the Glauber-Sudarshan symbols are explicitly derived
description: latex, 8 pages, expanded version accepted by J. Phys. A
Singular Hylleraas three-electron integrals
Creators: name: Pachucki, Krzysztof
name: Puchalski, Mariusz
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Calculations of the leading quantum electrodynamics effects in few electron systems involve singular matrix elements of the inter-electronic distances of the form $1/r_i^3$ and $1/r_{ij}^3$. Integrals that result when the nonrelativistic wave function is represented with a Hylleraas basis representation are studied. Recursion relations for various powers of the electron coordinates and the master integrals are derived in a form suited for high precision numerical evaluations.
description: 20 pages, accepted for Phys. Rev. A