cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Amphisbetia ramifera Watson 2019, sp. nov.
Creators: name: Watson, Jeanette E.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Cnidaria
Hydrozoa
Leptothecata
Sertulariidae
Amphisbetia
Amphisbetia ramifera

description: Amphisbetia ramifera sp. nov.
http://zoobank.org/urn:lsid:zoobank.org:act:0BB245B8-E3F4-
421C-928A-CA2C1FB84A30
Figure 2 c, d
Record. QM G337425. Holotype, one microslide. Coll: near Flinders Island, eastern Bass Strait, Victoria, 40.386 S, 148.928 E to 40.383 S, 148.951 E, 932–1151 m, beam trawl, 21/05/2017.
Description. A branched stem fragment 5 mm long with four alternate branches on each side; stem and branches monosiphonic. Two tubular subopposite hydrothecae on stem internode, adcauline walls separated, nodes strong, transverse, deeply indented. Apophysis long, narrowing distally to transverse node, an axillar hydrotheca pointing along hydrocladium.
First branch internode long, athecate, expanding slightly to a strong opposed V-shaped joint. Branch internodes same as stem, nodes may be absent but where present transverse to slightly oblique, strongly contracted. Hydrothecae opposite, tubular, base of one hydrotheca usually slightly downwardly displaced with respect to that opposite. Lower adcauline wall of each pair adnate, wall straight to weakly convex basally, the convexity increasing towards free wall; free wall weakly convex or concave to margin. Abcauline wall smoothly concave, some walls slightly bulging just above base. Floor transverse to internode, a small downward septum from adnate wall passing into internode. Margin deep saddle-shaped, flanked by a pair of long, sharp lateral cusps.
Perisarc thick, colour (preserved material) shining golden brown.
Remarks. The fragment is probably an apical branch of a larger colony. The hydrothecae closely resemble Amphisbetia minima (Thompson, 1879), a common shallow water species in Australia and New Zealand. A. minima invariably has short unbranched stems unlike the branching habit of A. ramifera. In colony size and branching habit, A. ramifera resembles Amphisbetia maplestonei (Bale, 1884) but in contrast to A. maplestonei the hydrocladial hydrothecae of A. ramifera are in contact with each other, do not have an abcauline intrathecal septum and the marginal cusps are much more prominent. No other Australian species of Amphisbetia has the smoothly outward-curved hydrothecae and such prominent marginal cusps as A. ramifera.
description: Published as part of Watson, Jeanette E., 2019, Bathyal and abyssal hydroids (Hydrozoa, Leptothecata) from southeastern Australia, pp. 65-72 in Memoirs of Museum Victoria 78 on pages 67-69, DOI: 10.24199/j.mmv.2019.78.04, http://zenodo.org/record/8065289
The spatial distribution of substellar objects in IC348 and the Orion Trapezium Cluster
Creators: name: Kumar, M. S. N.
name: Schmeja, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: Some theoretical scenarios suggest the formation of brown dwarfs as ejected stellar embryos in star-forming clusters. Such a formation mechanism can result in different spatial distributions of stars and substellar objects. We aim to investigate the spatial structure of stellar and substellar objects in two well sampled and nearby embedded clusters, namely IC348 and the Orion Trapezium Cluster (OTC) to test this hypothesis. Methods:Deep near-infrared K-band data complete enough to sample the substellar population in IC348 and OTC are obtained from the literature. The spatial distribution of the K-band point sources is analysed using the Minimum Spanning Tree (MST) method. The Q parameter and the spanning trees are evaluated for stellar and substellar objects as a function of cluster core radius R$_c$. Results: The stellar population in both IC348 and OTC display a clustered distribution whereas the substellar population is distributed homogeneously in space within twice the cluster core radius. Although the substellar objects do not appear to be bound by the cluster potential well, they are still within the limits of the cluster and not significantly displaced from their birth sites. Conclusions: The spatially homogeneous distribution of substellar objects is best explained by assuming higher initial velocities, distributed in a random manner and going through multiple interactions. The overall spatial coincidence of these objects with the cluster locations can be understood if these objects are nevertheless travelling slowly enough so as to feel the gravitational effect of the cluster. The observations support the formation of substellar objects as ``ejected stellar embryos''. Higher ejection velocities are necessary but net spatial displacements may not be necessary to explain the observational data.
description: 4 pages. Accepted by A&A Letters
Wideband Balanced Amplifier for Future ALMA Wideband Receivers
Creators: name: Desmaris, Vincent
Publisher: name: Zenodo
Year: 2019

description: The new generations of ALMA receivers demand wider instantaneous IF bandwidths combined with 2SB mixer technology. As a result, the required larger fractional bandwidths of cryogenic IF amplifiers impose a trade-off between their noise temperature and input reflection matching.
Cryogenic isolators have so far been employed in all European bands of ALMA. However, ferrite isolators are already reaching their limits in terms of fractional bandwidth and further degrade the noise temperature at the edge of the band.
Balanced amplifier on the other hand are implemented in some prototype radio astronomical receivers and have the great advantage of providing larger fractional bandwidth with better overall noise performance than with an input isolator.
At the workshop, we shall present the results of the latest development in terms of cryogenic balanced amplifiers for SIS receivers with enhanced IF bandwidth and the resulting performance of wideband prototypes receivers operating at 300 GHz.
Chronological null complete spacetimes admit a global time
Creators: name: Minguzzi, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The result "chronological spacetimes without lightlike lines are stably causal" is announced and motivated. It implies that chronological spacetimes which are null geodesically complete and satisfy the null genericity and the null (averaged) energy condition admit a time function.
description: Latex2e, 4 pages, 1 figure. To appear in the Proceedings of the "Spanish Relativity Meeting: Physics and Mathematics of Gravitation", Salamanca (Spain), September 15-19, 2008
Thermometric Calibration of the Ultrafast Relaxation Dynamics in Plasmonic Au Nanoparticles
Creators: name: Ferrera, Marzia
name: Della Valle, Giuseppe
name: Sygletou, Maria
name: Magnozzi, Michele
name: Catone, Daniele
name: O'Keeffe, Patrick
name: Paladini, Alessandra
name: Toschi, Francesco
name: Mattera, Lorenzo
name: Canepa, Maurizio
name: Bisio, Francesco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The excitation of plasmonic nanoparticles by ultrashort laser pulses sets in motion a complex ultrafast relaxation process involving the gradual re-equilibration of the system's electron gas, lattice and environment. One of the major hurdles in studying these processes is the lack of direct measurements of the dynamic temperature evolution of the system subcomponents. We measured the dynamic optical response of ensembles of plasmonic Au nanoparticles following ultrashort-pulse excitation and we compared it with the corresponding static optical response as a function of the increasing temperature of the thermodynamic bath. Evaluating the two sets of data, the optical fingerprints of equilibrium or off-equilibrium responses could be clearly identified, allowing us to extract a dynamic thermometric calibration scale of the relaxation process, yielding the experimental ultrafast temperature evolution of the plasmonic particles as a function of time.
Towards sideband-separation for ALMA's highest bands
Creators: name: Hesper, Ronald
Publisher: name: Zenodo
Year: 2019

description: Over the last few years, we developed high-performance sideband-separating (2SB) mixers for 600-720 GHz (Band 9) and 790-950 GHz (Band 10). The former have successfully been commissioned in the SEPIA front-end at APEX. On-sky image rejection ratios in excess of 24dB have been recorded for the CO(6-5) line at 691 GHz and the water maser line at 658 GHz, while lab testing shows 15dB or better over an extended RF band of about 580-740GHz. Noise temperature is better than 200K (SSB) over most of the band. The receiver cartridge has four 4-12 GHz IF outputs and is fully ALMA-frontend compatible. We intend to extend the IF bandwidth even further in the near future. The new Band 790-950 GHz 2SB mixer (intended for the FLASH front-end at APEX) has been tested in the lab recently and shows comparable performance characteristics. We see these mixers, with circulator-less wideband IF infrastructure, as an attractive upgrade for the highest ALMA bands.
Lorentzian Lie n-algebras
Creators: name: Figueroa-O'Farrill, José
Publisher: name: arXiv
Year: 2008
Subjects: subject: Representation Theory (math.RT)
subject: High Energy Physics - Theory (hep-th)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We classify Lie n-algebras possessing an invariant lorentzian inner product.
description: 10 pages (V2: more details on Section 3 and a new lemma. V3: typos corrected)
Eficácia e eficiência do ensino na Faculdade de Medicina da Universidade Agostinho Neto em 2005
Creators: name: De Campos, Paulo Adão
name: Miguel André, António
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: .
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
Supporting the Decolonisation of Learning in Africa - The TCC Africa and Digital Science Partnership
Creators: name: Cotera, Maria
name: Owango, Joy
Publisher: name: AfLIA
Year: 2023
Subjects: classificationCode: 461006
subject: Library studies

description: In this joint paper, the Training Centre in Communication (TCC Africa) and Digital Science showcase how we have been working with African librarians and researchers to support Open Science projects aiming to decolonise learning in Africa and put the power in the hands of African researchers; provide training and thought leadership in scholarly and science communication which have improved visibility of African researchers’ outputs and contributed to reclaim research sovereignty; and increase the adoption of Digital Science’s Dimensions and Figshare as critical tools to support the future of research, libraries and sustainable development in Africa.
Christian Gastgeber u.a. (Hrsg.), Matthias Corvinus und seine Zeit. Europa am Übergang vom Mittelalter zur Neuzeit zwischen Wien und Konstantinopel
Creators: name: Smíšek, Rostislav
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2013

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 62 Nr. 3 (2013): Fear and Fascination: War, Enemies, and the Other in the Soviet Bloc through the 1950s
Dirac Cat States in Relativistic Landau Levels
Creators: name: Bermudez, A.
name: Martin-Delgado, M. A.
name: Solano, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that a relativistic version of Schrodinger cat states, here called Dirac cat states, can be built in relativistic Landau levels when an external magnetic field couples to a relativistic spin 1/2 charged particle. Under suitable initial conditions, the associated Dirac equation produces unitarily Dirac cat states involving the orbital quanta of the particle in a well defined mesoscopic regime. We demonstrate that the proposed Dirac cat states have a purely relativistic origin and cease to exist in the non-relativistic limit. In this manner, we expect to open relativistic quantum mechanics to the rich structures of quantum optics and quantum information.
description: Revtex4, color figures, submitted for publication
Quantum computing critical exponents
Creators: name: Dreyer, Henrik
name: Bejan, Mircea
name: Granet, Etienne
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that the Variational Quantum-Classical Simulation algorithm admits a finite circuit depth scaling collapse when targeting the critical point of the transverse field Ising chain. The order parameter only collapses on one side of the transition due to a slowdown of the quantum algorithm when crossing the phase transition. In order to assess performance of the quantum algorithm and compute correlations in a system of up to 752 qubits, we use techniques from integrability to derive closed-form analytical expressions for expectation values with respect to the output of the quantum circuit. We also reduce a conjecture made by Ho and Hsieh about the exact preparation of the transverse field Ising ground state to a system of equations.
description: 16 pages, 5 figures
Second Order Topological Insulator State in Hexagonal Lattices and its Abundant Material Candidates
Creators: name: Qian, Shifeng
name: Liu, Cheng-Cheng
name: Yao, Yugui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose two mechanisms to realize the second order topological insulator (SOTI) state in spinless hexagonal lattices, viz., chemical modification and anti-Kekulé/Kekulé distortion of hexagonal lattice. Correspondingly, we construct two models and demonstrate the nontrivial band topology of the SOTI state characterized by the second Stiefel-Whitney class $w_2$ in the presence of inversion symmetry ($\textit{P}$) and time-reversal symmetry ($\textit{T}$). Based on the two mechanisms and using first-principles calculations and symmetry analysis, we predict three categories of real light element material candidates, i.e., hydrogenated and halogenated 2D hexagonal group IV materials XY (X=C, Si, Ge, Sn, Y=H, F, Cl), 2D hexagonal group V materials (blue phosphorene, blue arsenene, and black phosphorene, black arsenene), and the recent experimentally synthesized anti-Kekulé/Kekulé order graphenes and the counterparts of silicene/germanene/stanene. We explicitly demonstrate the nontrivial topological invariants and existence of the protected corner states with fractional charge for these candidates with giant bulk band gap (up to 3.5 eV), which could facilitate the experimental verification by STM. Our approaches and proposed abundant real material candidates will greatly enrich 2D SOTIs and promote their intriguing physics research.
description: Manuscript (5 figures, 1 table) + Supplementary Material (23 figures, 2 tables), 24 pages
Discovery of Par 1802 as a Low-Mass, Pre-Main-Sequence Eclipsing Binary in the Orion Star-Forming Region
Creators: name: Cargile, P. A.
name: Stassun, K. G.
name: Mathieu, R. D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a pre-main-sequence, low-mass, double-lined, spectroscopic, eclipsing binary in the Orion star-forming region. We present our observations including radial velocities derived from optical high-resolution spectroscopy, and present an orbit solution that permits the determination of precise empirical masses for both components of the system. We measure that Par 1802 is composed of two equal mass (0.39+-0.03, 0.40+-0.03 Msun) stars in a circular, 4.7 day orbit. There is strong evidence, such as the system exhibiting strong Li lines and a center-of-mass velocity consistent with cluster membership, that this system is a member of the Orion star-forming region and quite possibly the Orion Nebula Cluster, and therefore has an age of only a few million years. As there are currently only a few empirical mass and radius measurements for low-mass, PMS stars, this system presents an interesting test for the predictions of current theoretical models of pre-main sequence stellar evolution.
description: 21 pages, 6 figures, 2 tables; Fig 2 caption edited
Marina Cattaruzza u.a. (Hrsg.), Territorial Revisionism and the Allies of Germany in the Second World War. Goals, Expectations, Practices
Creators: name: Brakel, Alexander
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2014

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 63 Nr. 4 (2014)
Caracterização dos conhecimentos sobre toxicologia na educação médica em Angola
Creators: name: Simões De Oliveira, Paula Regina
name: Morais Nicolau, Santos
name: Da Silva, Belchior
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: Caracterizou-se no presente trabalho os conhecimentos sobre toxicologia na educação médica em Angola, efetuando-se um estudo observacional descritivo transversal numa população constituída por médicos angolanos com atividade docente e assistencial nas faculdades de medicina e nos hospitais vinculados as faculdades das províncias de Luanda, Benguela, Malanje e Huambo. A amostra foi selecionada com a técnica probabilística aleatória simples a partir da listagem dos médicos dos hospitais, utilizando o programa estatístico Epidat versão 3,1; foram incluídos no estudo 202 médicos. Utilizou-se um questionário pré-validado. Os dados foram processados mediante o programa Statistical Package for Social Sciences (SPSS) versão 16. Na amostra predominaram os licenciados em clínica geral com 55,9%, os médicos com um tempo de exercício menor que cinco anos em 41,1% e maior que 10 anos em 40,1% e aqueles com o grau de licenciado em 88,1%. O nível de conhecimento geral sobre toxicologia dos médicos em Angola foi insuficiente em todas as temáticas avaliadas e em geral foi de 91,6%. Não se encontrou uma relação entre o nível de conhecimento, a especialidade (p = 0,7), o grau académico (p = 0,4) e o tempo de exercício (p = 0,3). Noventa e cinco por cento (95,0%) dos médicos opinam que a toxicologia deve fazer parte da formação pós-graduada do médico angolano, 66,0% opina que não é suficiente o conteúdo da toxicologia no programa de estudo da medicina em Angola e 91,0% opina que é necessária no ensino da medicina em Angola.
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
Revisiting Pulsar Velocities Using Gaia Data Release 2
Creators: name: Yang, Meng
name: Dai, Shi
name: Li, Di
name: Tsai, Chao-Wei
name: Zhu, Wei-Wei
name: Zhang, Jie
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Precise measurements of neutron star (NS) velocities provide critical clues to the supernova physics and evolution of binary systems. Based on Gaia Data Release 2 (DR2), we selected a sample of 24 young (<3 Myr) pulsars with precise parallax measurements and measured the velocity of their local standard of rest (LSR) and the velocity dispersion among their respective local stellar groups. The median velocity difference between thus calculated LSRs and the Galactic rotation model is ~7.6km/s, small compared to the typical velocity dispersion of ~27.5km/s. For pulsars off the Galactic plane, such differences grow significantly to as large as ~40 km/s. More importantly, the velocity dispersion of stars in the local group of low-velocity pulsars can be comparable to their transverse velocities, suggesting that the intrinsic velocities of NS progenitors should be taken into account when we consider their natal kicks and binary evolution. We also examined the double NS systems J0737- 3039A/B, and measured its transverse velocity to be 26(+18, -13) km/s assuming nearby Gaia sources being representative of its birth environment. This work demonstrated the feasibility and importance of using Gaia data to study the velocity of individual systems and velocity distribution of NSs.
Cosa cantavano di solito le sirene? Quid sirenae cantare sint solitae?
Creators: name: Spina, Luigi
Publisher: name: Annali Online  Lettere - Ferrara
Year: 2012

description: In the course of my research on the myth of the Sirens, I found very  interesting and quibbling the question the Emperor Tiberius asked the  grammarians at his court: what song did the Sirens usually sing? I have  tried to answer this - ancient and modern - question not only by  analysing the different solutions many scholars, writers, poets  continued to find in order to satisfy, so to say, the Emperor's  curiosity, but also by calling to witness all the literary characters  who, besides Odysseus, were said to have heard the song of the Sirens.  To introduce the topic, I have valued the attention Giacomo Leopardi  payed in his works to the myth of the Sirens.
description: Annali Online  Lettere - Ferrara, Volume Speciale, supp. II 2 (2007)
Molecular gas budget and characterization of intermediate-mass star-forming galaxies at $z\approx 2-3$
Creators: name: Solimano, M.
name: González-López, J.
name: Barrientos, L. F.
name: Aravena, M.
name: López, S.
name: Tejos, N.
name: Sharon, K.
name: Dahle, H.
name: Bayliss, M.
name: Ledoux, C.
name: Rigby, J. R.
name: Gladders, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Star-forming galaxies (SFGs) with stellar masses below $10^{10}\,M_\odot$ make up the bulk of the galaxy population at $z>2$. The properties of the cold gas in these galaxies can only be probed in very deep ALMA observations or by targeting strongly lensed galaxies. Here we report the results of a pilot survey using the Atacama Compact Array (ACA) of molecular gas in the most strongly magnified galaxies selected as giant arcs in optical data. The selection in rest-frame UV wavelengths ensures that sources are regular star forming galaxies, without a priori indications of intense dusty starburst activity. We conducted Band 4 and Band 7 observations to detect mid-$J$ CO, [C I] and thermal continuum as molecular gas tracers from four strongly lensed systems at $z\approx2-3$: our targets are SGAS J1226651.3+215220 (A and B), SGAS J003341.5+024217 and the Sunburst Arc. The measured molecular mass is then projected onto the source plane with detailed lens models developed from high resolution HST observations. Multiwavelength photometry is then used to obtain the intrinsic stellar mass and star formation rate via SED fitting. In only one of the sources are the three tracers robustly detected, while in the others they are either undetected or detected in continuum only. The implied molecular gass masses range from $4\times 10^{9}\,M_\odot$ in the detected source to an upper limit of $\lesssim 10^9\,M_\odot$ in the most magnified source. The inferred gas fraction and gas depletion timescale are found to lie approximately 0.5 to 1.0 dex below the established scaling relations based on previous studies of unlensed massive galaxies. Our results indicate that the cold gas content of intermediate to low mass galaxies should not be extrapolated from the trends seen in more massive high-$z$ galaxies. (Abridged abstract)
description: 17 pages, 7 figures. Accepted for publication in Astronomy & Astrophysics
Universal sub-leading terms in ground state fidelity
Creators: name: Venuti, Lorenzo Campos
name: Saleur, Hubert
name: Zanardi, Paolo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The study of the (logarithm of the) {\em fidelity} i.e., of the overlap amplitude, between ground states of Hamiltonians corresponding to different coupling constants, provides a valuable insight on critical phenomena. When the parameters are infinitesimally close, it is known that the leading term behaves as $O(L^α)$ ($L$ system size) where $α$ is equal to the spatial dimension $d$ for gapped systems, and otherwise depends on the critical exponents. Here we show that when parameters are changed along a critical manifold, a sub-leading O(1) term can appear. This term, somewhat similar to the topological entanglement entropy, depends only on the system's universality class and encodes non-trivial information about the topology of the system. We relate it to universal $g$ factors and partition functions of (boundary) conformal field theory in $d=1$ and $d=2$ dimensions. Numerical checks are presented on the simple example of the XXZ chain.
description: revtex4, 2 pdf figures
Ensino-aprendizagem e competências em Otorrinolaringologia - Um estudo no curso de medicina da Faculdade de Medicina da Universidade Agostinho Neto
Creators: name: Essenje Pintar Kuatoko, Palmira
name: Spratley, Jorge
name: Filipe, Matuba
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: .
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
An inhibitor of ornithine decarboxylase in the thymus and spleen of dexamethasone-treated rats
Creators: name: Bishop, Paul Burton
Publisher: name: University of British Columbia
Year: 2010

description: The activity of ornithine decarboxylase, the rate-determining enzyme in polyamine biosynthesis, decreases markedly in rat thymus and spleen soon after the injection of rats with dexamethasone. This study shows that as early as 2 1/2 hours after hormone treatment, when enzyme activity is very low, an inhibitor of ODC is present. Inhibition of ODC can be readily detected at 5 and 12 hours, but not at 24 hours after glucocorticoid injection. The inhibitor appears to be a protein since its activity was destroyed by heat or trypsin. It retains its activity after dialysis which differentiates it from other ODC inhibitors that require small molecular weight substances for activity. The apparent molecular weight of a partially purified extract was 54,000, which differentiates this inhibitor from antizyme, an inhibitor of ODC found in several other cell types. The inhibitor appears to act by a non-competitive and non-catalytic mechanism since the amount of inhibition does not change with time and its interaction with ODC does not affect the enzyme's affinity for ornithine. The formation of this inhibitor is an early event in lymphoid tissues in response to dexamethasone and may be important in causing the inhibition of cell division which precedes the destruction of lymphocytes.
Sideband Separating Mixer for atmospheric window 790-950 GHz
Creators: name: Khudchenko, Andrey
Publisher: name: Zenodo
Year: 2019

description: We have developed a Sideband Separating (2SB) Mixer based on superconductor-insulator-superconductor (SIS) junctions for frequency range 790-950 GHz. In the first test this mixer demonstrated the noise temperature from 450 to 900 K and the image rejection ratio above 15dB in 95% of the band. The SIS mixers used here have DSB noise temperature form 220 to 400 K. These results show that RF waveguide hybrid structure for such a high frequencies can be manufactured with losses level below 0.8 dB. It makes attractive possible ALMA upgrade of Band 10 receivers to 2SB option, because the sensitivity for spectral lines observations can be improved by about 30% by using 2SB mixers instead of DSB ones.
The nucleus of the Sagittarius dSph galaxy and M54: a window on the process of galaxy nucleation
Creators: name: Bellazzini, M.
name: Ibata, R. A.
name: Chapman, S. C.
name: Mackey, A. D.
name: Monaco, L.
name: Irwin, M. J.
name: Martin, N. F.
name: Lewis, G. F.
name: Dalessandro, E.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of a thorough study of the nucleus of the Sgr dwarf spheroidal galaxy and of the bright globular cluster M54 that resides within the same nucleus (Sgr,N). We have obtained accurate radial velocities and metallicity estimates for 1152 candidate Red Giant Branch stars of Sgr and M54 lying within ~ 9 arcmin from the center of the galaxy, from Keck/DEIMOS and VLT/FLAMES spectra of the infrared Calcium II triplet. Using both velocity and metallicity information we selected two samples of 425 and 321 very-likely members of M54 and of Sgr,N, respectively. The two considered systems display significantly different velocity dispersion profiles: M54 has a steeply decreasing profile from r=0, where sigma= 14.2 km/s, to r=3.5 arcmin where it reaches sigma=5.3 km/s, then it appears to rise again to sigma= 10 km/s at r=7 arcmin. In contrast Sgr,N has a uniformly flat profile at sigma=9.6 km/s over the whole 0 < r < 9 arcmin range. Using data from the literature we show that the velocity dispersion of Sgr remains constant at least out to r ~ 100 arcmin and there is no sign of the transition between the outer flat-luminosity-profile core and the inner nucleus in the velocity profile. These results - together with a re-analysis of the surface brightness profile of Sgr,N and a suite of dedicated N-body simulations - provide very strong support for the hypothesis that the nucleus of Sgr formed independently of M54, which probably plunged to its present position, coincident with Sgr,N, because of significant decay of the original orbit due to dynamical friction.
description: Accepted for publication by the Astronomical Journal. emulateapj.cls, 26 pag., 21 low resolution figures. A full-resolution color version of the paper can be retrieved from http://www.bo.astro.it/SGR/Sgr_nucleus.ps.gz
Contributos da Radiologia no processo de ensino-aprendizagem da Anatomia - um estudo nas faculdades de medicina em Angola
Creators: name: Machado Bebiano Tomás, Ndenga Solange
name: Ferreira, Maria Amélia
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: O ensino da anatomia na educação médica básica sofreu, nos últimos anos, muitas alterações e evoluções, isto acompanhando a evolução das tecnologias de imagem ligadas ao ensino da Anatomia. O papel da Radiologia no ensino da anatomia tem aumentado continuamente, contribuindo para a aquisição de competências indispensáveis ao exercício da medicina no século XXI. No presente estudo pretendemos abordar aspetos ligados ao ensino da Anatomia, à luz das novas exigências atuais, recolhendo dados através de um inquérito realizado aos docentes responsáveis pelo ensino da Anatomia, nas escolas médicas angolanas. Foi efetuado um estudo observacional, descritivo, qualitativo e exploratório, nas oito faculdades de medicina, em Angola. As imagens de Radiologia convencional, tomografia computadorizada e ressonância magnética são as mais usadas. Todos os coordenadores responderam que utilizam a Radiologia nas aulas teóricas, sendo que 50% também utiliza nas aulas práticas. Seis coordenadores (87,5%) referiram a Radiologia convencional como a técnica mais importante e 14,3% a tomografia computadorizada. A Radiologia está a entrar gradualmente como um recurso adicional nos cursos de medicina administrados nas faculdades de medicina em Angola.
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
Spectrum of the non-commutative spherical well
Creators: name: Scholtz, F. G.
name: Chakraborty, B.
name: Govaerts, J.
name: Vaidya, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We give precise meaning to piecewise constant potentials in non-commutative quantum mechanics. In particular we discuss the infinite and finite non-commutative spherical well in two dimensions. Using this, bound-states and scattering can be discussed unambiguously. Here we focus on the infinite well and solve for the eigenvalues and eigenfunctions. We find that time reversal symmetry is broken by the non-commutativity. We show that in the commutative and thermodynamic limits the eigenstates and eigenfunctions of the commutative spherical well are recovered and time reversal symmetry is restored.
Qualitative standards-setting for Canadian health care services
Creators: name: Allen, Elizabeth
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this study was to examine the process of standards-setting in the Canadian health care system to determine how quality health services are assured and maintained for the elderly population who require care. The interrelatedness of all aspects affecting the provision of quality services was examined: the professional, organizational and administrative aspects governing care delivery. The historical development of health care standards-setting revealed the unsatisfactory nature of regulatory activity in Canada. A shift from a focus on structural standards to a preference for peer-review mechanisms established the professional mechanisms as the preferred means of control; essentially, quality health care services were equated with meeting the normative standards of practice. These professional aspects of care delivery, however, increasingly have led to the medicalization of needs and the fragmentation of services. Standards-setting, from government legislative standards to quality assurance programs, supported and promoted normative practices that tended to escalate costs and provided the wrong incentives for acute and long term care services. The evolution of the long term care services in British Columbia was identified to illustrate the deficiencies in the current approaches to health care standards-setting. Gaps existed in the provision of services for the elderly who required long term care. The nature of long term care services was examined and discussed. Long term care services were not so much based on outcomes, as in the acute care system, but on the processes of care -- the aspects of care provision that would enhance the quality of life for the elderly who require health care services. Current standards-setting practices did not address or provide for these services. The administrative aspects governing care provision were explored as a means to assure quality service delivery. Canadian health care developments were compared to those in the United Kingdom and the United States. Regardless of the approach -- in the United Kingdom with its national Health Service, or in the United States with the proliferation of regulatory activity --costs continued to increase and conflicts arose between the professional and administrative aspects governing services. It becomes apparent, however, that as cost constraints increase micro-level decisions will become more dependent on macro-level decision making. Current standards-setting practices do not address or provide for services that require expanded models of care provision. Appropriate standards-setting for care processes, therefore, must include not only the professional aspects but take into account the administrative and organizational aspects when developing services. Based on the findings of the study, recommendations are made for standards-setting for long term care services.
Characterization of the dissipative mappings and their application to perturbations of dissipative-Hamiltonian systems
Creators: name: Baghel, Mohit Kumar
name: Gillis, Nicolas
name: Sharma, Punit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, we find necessary and sufficient conditions to identify pairs of matrices $X$ and $Y$ for which there exists $Δ\in \mathbb C^{n,n}$ such that $Δ+Δ^*$ is positive semidefinite and $ΔX=Y$. Such a $Δ$ is called a dissipative mapping taking $X$ to $Y$. We also provide two different characterizations for the set of all dissipative mappings, and use them to characterize the unique dissipative mapping with minimal Frobenius norm. The minimal-norm dissipative mapping is then used to determine the distance to asymptotic instability for dissipative-Hamiltonian systems under general structure-preserving perturbations. We illustrate our results over some numerical examples and compare them with those of Mehl, Mehrmann and Sharma (Stability Radii for Linear Hamiltonian Systems with Dissipation Under Structure-Preserving Perturbations, SIAM J. Mat. Anal. Appl.\ 37 (4): 1625-1654, 2016).
Avaliação da repercussão do ensino pré-graduado de Oftalmologia em Clínica Geral
Creators: name: Da Cunha Junqueira, Mariana
name: Santana Bettencourt Mateus, Miguel
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: Estudos efetuados em vários países e contextos sugerem que a licenciatura em medicina não proporciona conhecimentos oftalmológicos suficientes para resolução de problemas básicos no atendimento do doente de atenção primária na comunidade. Muitos médicos de cuidados primários consideram a sua formação oftalmológica como sendo inadequada para proporcionar a confiança e compreensão necessárias para o efeito. O objetivo desta pesquisa é avaliar as competências e habilidades da aprendizagem da disciplina de Oftalmologia em médicos estagiários das faculdades de medicina da UAN e da UNIPIAGET em Angola. Foi feito um estudo analítico comparativo a 152 médicos dessas escolas, no ano letivo de 2011/2012, relativamente ao grau de confiança que sentem na absorção de competências e habilidades clínicas, perante situações do foro oftalmológico. Observou-se que a idade média dos médicos estagiários é de 30 anos, com um desvio padrão de 6,02 anos, e que o sexo feminino representa 71% da amostra. Verificamos que o grau de confiança frente a questões oftalmológicas genéricas do maior número de médicos foi o de moderadamente confiante correspondendo a 57 (37,5%), enquanto no relativo a questões específicas oftalmológicas foi de pouco confiante para quase todas as questões exceto no referente a orbita, conjuntiva e avaliação clínica. Considerando o estudo como analítico, fez-se uma leitura do qui-quadrado com a correção de continuidade e respetivo valor de P. para 2 caudas da curva de Gauss. Em todas as situações comparadas revelou-se que o valor de P foi sempre superior a 0,05, significando não-rejeição da hipótese nula levantada para qualquer segmento ocular ensinado, ou por outras palavras, há evidência estatística suficiente para afirmar que “independentemente do local de formação, os conhecimentos de Oftalmologia adquiridos pelos médicos ao nível da licenciatura, não são suficientes para lidarem adequadamente com as situações básicas mais frequentes em termos de cuidados primários de saúde”.
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
Marek Hałub, Matthias Weber (Hrsg.), Mein Schlesien, meine Schlesier. Zugänge und Sichtweisen
Creators: name: Herzig, Arno
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 2013

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 62 Nr. 3 (2013): Fear and Fascination: War, Enemies, and the Other in the Soviet Bloc through the 1950s
Polarization-independent CP-odd Observable in e^+e^- Chargino Production at One Loop
Creators: name: Osland, Per
name: Kalinowski, Jan
name: Rolbiecki, Krzysztof
name: Vereshagin, Alexander
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss CP violation in the process e^+e^- \to \tildeχ^+_i\tildeχ^-_j with unpolarized beams. When the scalars are heavy, the box-diagram results constitute a major part of the full result. However, there are situations when the vertex and self-energy corrections dominate over the box diagrams. We also comment on CP violation in the final chargino decay.
description: 4 pages, Latex, 3 eps-figures included, Talk given at 2007 International Linear Collider Workshop (LCWS07 and ILC07), Hamburg, Germany, 30 May - 3 Jun 2007
Study and Development of Wideband Receivers at NAOJ
Creators: name: Kojma, Takafumi
Publisher: name: Zenodo
Year: 2019

description: We have studied and developed wideband low-noise SIS mixers for respective radio frequency (RF) and intermediate frequency (IF) bandwidths. So far, we have demonstrated double sideband (DSB) receiver noise temperature about 2 to 3 times the quantum noise over the RF 275-500 GHz with the IF band of 4-8 GHz. We have also achieved the promising result that demonstrates low-noise and flat gain over the 3–18-GHz IF range at local oscillator frequencies of 400 GHz. Our aim in near future is to demonstrate a DSB receiver with the wide RF and IF bandwidths, combining those technologies. In this talk, we will present the current status and latest result of the SIS mixer.
Adequação da avaliação aos objetivos educacionais nas disciplinas do ciclo básico da Faculdade de Medicina da Universidade Agostinho Neto 2005-2006
Creators: name: Marcos Paquisse, Maria Madalena
name: Miguel André, António
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: Com o objetivo de analisar a adequação da avaliação dos estudantes aos objetivos educacionais, realizou-se um estudo transversão no ciclo básico da Faculdade de Medicina da Universidade Agostinho Neto, no ano académico 2005-2006. Foram inquiridos 240 estudantes e 28 docentes, sendo 11 (39,3%) professores e 17 (60,7%) assistentes. A fundamentação inclui conceções sobre o processo de ensino-aprendizagem e avaliação. Tendo em consideração estes fundamentos foram feitos inquéritos a docentes e estudantes do ciclo básico, procurando identificar conceitos e possíveis transformações nas formas de avaliação da aprendizagem. Como resultado da pesquisa, verificou-se que a elaboração e distribuição dos programas não são feitas em todas as disciplinas e os objetivos educacionais, na sua maioria, não se encontram descritos nos programas; as realizações das provas de avaliação, na maioria das disciplinas, não são feitas com base nos objetivos educacionais. A compatibilidade entre as práticas de avaliação e os objetivos educacionais é débil. A pesquisa permitiu levantar questões que possam contribuir para a construção de novos caminhos para as práticas avaliativas e traçar novas estratégicas referentes a todo o processo de ensino-aprendizagem, sendo imprescindível a elaboração de programas em cada disciplina com a descrição dos objetivos educacionais, tendo como foco principal a redução dos índices de reprovação doi ciclo básico.
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
Fabrication of closely spaced, independently contacted Electron-Hole bilayers in GaAs-AlGaAs heterostructures
Creators: name: Keogh, J. A.
name: Gupta, K. Das
name: Beere, H. E.
name: Ritchie, D. A.
name: Pepper, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We describe a technique to fabricate closely spaced electron-hole bilayers in GaAs-AlGaAs heterostructures. Our technique incorporates a novel method for making shallow contacts to a low density ($<10^{11}cm^{-2}$) 2-dimensional electron gas (2DEG) that do not require annealing. Four terminal measurements on both layers (25nm apart) are possible. Measurements show a hole mobility $μ_{h}>10^{5}{\rm cm}^{2}{\rm V}^{-1}{\rm s}^{-1}$ and an electron mobility $μ_{e}>10^{6}{\rm cm}^{2}{\rm V}^{-1}{\rm s}^{-1}$ at 1.5K. Preliminary drag measurements made down to T=300mK indicate an enhancement of coulomb interaction over the values obtained from a static Random Phase Approximation (RPA) calculation.
description: 4 pages, 4 EPS figures
Direct laser writing for cardiac tissue engineering: a microfluidic heart on a chip with integrated transducers
Creators: name: Jayne, Rachael K.
name: Karakan, M. Çağatay
name: Zhang, Kehan
name: Pierce, Noelle
name: Michas, Christos
name: Bishop, David J.
name: Chen, Christopher S.
name: Ekinci, Kamil L.
name: White, Alice E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Tissues and Organs (q-bio.TO)
subject: FOS: Biological sciences

description: We have designed and fabricated a microfluidic-based platform for sensing mechanical forces generated by cardiac microtissues in a highly-controlled microenvironment. Our fabrication approach combines Direct Laser Writing (DLW) lithography with soft lithography. At the center of our platform is a cylindrical volume, divided into two chambers by a cylindrical polydimethylsiloxane (PDMS) shell. Cells are seeded into the inner chamber from a top opening, and the microtissue assembles onto tailor-made attachment sites on the inner walls of the cylindrical shell. The outer chamber is electrically and fluidically isolated from the inner one by the cylindrical shell and is designed for actuation and sensing purposes. Externally applied pressure waves to the outer chamber deform parts of the cylindrical shell and thus allow us to exert time-dependent forces on the microtissue. Oscillatory forces generated by the microtissue similarly deform the cylindrical shell and change the volume of the outer chamber, resulting in measurable electrical conductance changes. We have used this platform to study the response of cardiac microtissues derived from human induced pluripotent stem cells (hiPSC) under prescribed mechanical loading and pacing.
description: Main article 15 pages, 6 figures, 1 tables; supplementary 11 pages, 7 figures, 1 table, 6 movies
Perceção da gestão da hipertensão arterial em ambulatório segundo opinião do médico não especialista em Cardiologia no Hospital Américo Boavida
Creators: name: Tchivinda, Maria Fernanda
name: De Vitória Pereira, Maria Helena
Publisher: name: Anais do Instituto de Higiene e Medicina Tropical
Year: 2021

description: O objetivo deste estudo é avaliar a perceção do médico não cardiologista, sobre a gestão da hipertensão arterial no ambulatório do Hospital Américo Boavida de acordo com as normas internacionalmente estabelecidas.
description: Anais do Instituto de Higiene e Medicina Tropical, v. 20 (2021): Suplemento nº 1 - Perspetivas sobre a educação médica em Angola
Dependence of the liquid-vapor surface tension on the range of interaction: a test of the law of corresponding states
Creators: name: Grosfils, Patrick
name: Lutsko, James F.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The planar surface tension of coexisting liquid and vapor phases of a fluid of Lennard-Jones atoms is studied as a function of the range of the potential using both Monte Carlo simulations and Density Functional Theory. The interaction range is varied from $r_c^* = 2.5$ to $r_c^* = 6$ and the surface tension is determined for temperatures ranging from $T^* = 0.7$ up to the critical temperature in each case. The results are shown to be consistent with previous studies. The simulation data are well-described by Guggenheim's law of corresponding states but the agreement of the theoretical results depends on the quality of the bulk equation of state.
description: 13 pages, 5 figures