cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
RF System-on-Package (SOP) Development for compact low cost Wireless Front-end systems
Creators: name: Pinel, S.
name: Lim, K.
name: Maeng, M.
name: Davis, M.F.
name: Li, R.
name: Tentzeris, M.
name: Laskar, J.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: This paper presents the development of RF System-on-Package (SOP) architectures for compact and low cost wireless radio front -end systems. A novel 3D integration approach for SOP-based solutions for wireless communication applications is proposed and utilized for the implementation of a C band Wireless LAN (WLAN) RF front-end module by means of stacking LTCC substrates using mBGA technology. Results from the characterization and the modeling of RF vertical board -to-board transitions using mBGA process are presented for the first time. LTCC designs of high-performance multilayer embedded bandpass filters and novel stacked cavity-backed patch antennas are also reported. In addition, the fabrication of very high Q-factor inductors and embedded filter in organic substrates demonstrate the satisfactory performance of multilayer organic packages.
cDNA library construction towards the identification of the ipecac alkaloid biosynthesis genes in tissue cultures of Psychotria ipecacuanha - preliminary characterization of the first isolated enzyme, ipecoside ß-D-glucosidase
Creators: name: Lara Quesada, Alfonso
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2007
Subjects: subject: Elektronische Publikation
subject: Hochschulschrift
subject: Online-Publikation
subject: Zsfassung in dt. Sprache
subject: 570
subject: 572.86362393
subject: 572.549452393

description: Die erste cDNA Bank von Psychotria ipecacuanha wurde aus in vitro Wurzelkulturen hergestellt. Pflanzenmaterial aus Costa Rica wurde zur Etablierung von Wurzelkulturen von P. ipecacuanha benutzt. Das Alkaloidprofil zeigte Ipecac Alkaloide beider (R)- und (S)- Konfigurationen in Blättern- und Wurzelgeweben und beinhaltete die medizinisch relevanten Alkaloide Cephaeline und Emetine. Die expressed sequence tag (EST) Analyse der cDNA Bank identifizierte verschiedene Klone, die Ähnlichkeit zu Genen des Sekundärstoffwechsels aufwiesen. Zwei Klone zeigten Homologie zu Genen des Monoterpenoid Indole Alkaloid Biosynthesewegs. Das erste isolierte Ipecac Alkaloid Sekundärstoffwechsel Gen aus P. ipecacuanha, Ipecoside β-D-Glucosidase wurde kloniert, heterolog exprimiert und anfänglich charakterisiert. Verschiedene Alkaloid-, Flavonoid-, Phenol- β-Glucoside wurden getestet; eine sehr hohe spezifische deglucosylierende Aktivität wurde mit dem Substrat Ipecoside detektiert.
description: A cDNA library of Psychotria ipecacuanha was generated from in vitro root culture. Plant material from Costa Rica was used for the establishment of root culture of P. ipecacuanha. An alkaloid profile analysis identified ipecac alkaloids of both (R)- and (S)- configurations in leaves and root tissues including the medicinal relevant alkaloids cephaeline and emetine. Expressed sequence tag (EST) analysis of the cDNA library detected several clones related to secondary metabolism including two clones with homology to monoterpenoid indole alkaloid biosynthetic pathway genes. The first isolated ipecac alkaloid biosynthetic pathway gene from P. ipecacuanha, ipecoside β-D-glucosidase was cloned, heterologous expressed and preliminary characterized. From several alkaloid-, flavonoid-, phenol- β-glucosides tested; a very specific deglucosylation activity was detected with the substrate ipecoside.
Numerical analysis of carrier multiplication mechanisms in nanocrystal and bulk forms of PbSe and PbS
Creators: name: Velizhanin, Kirill A.
name: Piryatinski, Andrei
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on systematic numerical study of carrier multiplication (CM) processes in spherically symmetric nanocrystal (NC) and bulk forms of PbSe and PbS representing the test bed for understanding basic aspects of CM dynamics. The adopted numerical method integrates our previously developed Interband Exciton Scattering Model (IESM) and the effective mass based electronic structure model for the lead chalocogenide semiconductors. The analysis of the IESM predicted CM pathways shows complete lack of the pathway interference during the biexciton photogeneration. This allows us to interpret the biexciton photogeneration as a single impact ionization (II) event and to explain major contribution of the multiple II events during the phonon-induced population relaxation into the total quantum efficiency (QE). We investigate the role of quantum confinement on QE, and find that the reduction in the biexciton density of states (DOS) overruns weak enhancement of the Coulomb interactions leading to lower QE values in NCs as compared to the bulk on the absolute photon energy scale. However, represented on the photon energy scale normalized by corresponding band gap energies the trend in QE is opposite demonstrating the advantage of NCs for photovoltaic applications. Comparison to experiment allows us to interpret the observed features and to validate the applicability range of our model. Modeling of QE as a function of pulse duration shows weak dependence for the gaussian pulses. Finally, comparison of the key quantities determining QE in PbSe and PbS demonstrates the enhancement of II rate in the latter materials. However, the fast phonon-induced carrier relaxation processes in PbS can lead to the experimentally observed reduction in QE in NCs as compared to PbSe NCs.
description: 18 pages, 12 figures
A Miniaturized 0.5-Watt Q-band 0.25-µm GaAs PHEMT High Power Amplifier MMIC
Creators: name: Bessemoulin, A.
name: Quentin, P.
name: Thomas, H.
name: Geiger, D.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: The performance of a very compact power amplifier MMIC for Q-band applications is reported. Using a 4-inch 0.25-µm GaAs power PHEMT process, this 4-stage amplifier achieved a linear gain of 19 dB over the 36 to 45 GHz frequency range, with an output power at 1-dB gain compression of 26 dBm (P-1dB=400 mW), and a saturated output power of 0.5 Watt (Psat=27 dBm), for a chip size of only 2.25 mm 2 (1.25 × 1.8 mm 2 ). Compared to state-of-the-art power amplifier MMICs operating in the 36-43 GHz frequency range, the combined output power- and gain- densities per chip area are nearly a factor two higher, namely 220 mW/mm 2 and 8.5 dB/mm 2 .
Dependence of Galaxy Quenching on Halo Mass and Distance from its Centre
Creators: name: Woo, Joanna
name: Dekel, Avishai
name: Faber, S. M.
name: Noeske, Kai
name: Koo, David C.
name: Gerke, Brian F.
name: Cooper, Michael C.
name: Salim, Samir
name: Dutton, Aaron A.
name: Newman, Jeffrey
name: Weiner, Benjamin J.
name: Bundy, Kevin
name: Willmer, Christopher N. A.
name: Davis, Marc
name: Yan, Renbin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the dependence of star-formation quenching on galaxy mass and environment, in the SDSS (z~0.1) and the AEGIS (z~1). It is crucial that we define quenching by low star-formation rate rather than by red colour, given that one third of the red galaxies are star forming. We address stellar mass M*, halo mass Mh, density over the nearest N neighbours deltaN, and distance to the halo centre D. The fraction of quenched galaxies appears more strongly correlated with Mh at fixed M* than with M* at fixed Mh, while for satellites quenching also depends on D. We present the M*-Mh relation for centrals at z~1. At z~1, the dependence of quenching on M* at fixed Mh is somewhat more pronounced than at z~0, but the quenched fraction is low (10%) and the haloes are less massive. For satellites, M*-dependent quenching is noticeable at high D, suggesting a quenching dependence on sub-halo mass for recently captured satellites. At small D, where satellites likely fell in more than a few Gyr ago, quenching strongly depends on Mh, and not on M*. The Mh-dependence of quenching is consistent with theoretical wisdom where virial shock heating in massive haloes shuts down accretion and triggers ram-pressure stripping, causing quenching. The interpretation of deltaN is complicated by the fact that it depends on the number of observed group members compared to N, motivating the use of D as a better measure of local environment.
description: 23 pages, 13 figures, accepted by MNRAS
Unitarity-violation in Generalized Higgs Inflation Models
Creators: name: Lerner, Rose N.
name: McDonald, John
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Unitarity-violation presents a challenge for non-minimally coupled models of inflation based on weak-scale particle physics. We examine the energy scale of tree-level unitarity-violation in scattering processes for generalized models with multiple scalar fields where the inflaton is either a singlet scalar or the Higgs. In the limit that the non-minimal couplings are all equal (e.g. in the case of Higgs or other complex inflaton), the scale of tree-level unitarity-violation matches the existing result. However if the inflaton is a singlet, and if it has a larger non-minimal coupling than other scalars in the model, then this hierarchy increases the scale of tree-level unitarity-violation. A sufficiently strong hierarchy pushes the scale of tree-level unitarity-violation above the Planck scale. We also discuss models which attempt to resolve the issue of unitarity-violation in Higgs Inflation.
description: 14 pages. Some additional discussion. Version published in JCAP
Broadband Active Phase Shifter GaAs MMIC
Creators: name: Duême, Ph.
name: Dequen, Th.
name: Funck, R.
name: Caillon, B.
name: Guerbeur, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: A broadband multifunction MMIC, achieving combined amplification and phase shift, has been developed on 2 (3.2 x 4) mm² chips using the UMS PH25 process. The frequency range is as large as characterised by a ratio of Fmax/Fmin = 6. The 5 bit phase shifter section is based on switched "all-pass" cells. The amplification function is realised through active switches consuming less than a total of 40 mA under 3V and providing an overall gain of about +6 dB.
Rhopaea Erichson 1847
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Rhopaea

description: Rhopaea Erichson, 1847b
[10 species].
Type species Rhopaea verreauxii Blanchard, 1851, by subsequent monotypy.
Note: Lacordaire (1856) incorrectly spelt Rhopaea as “ Rhopea ”.
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 127, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
An Alternative String Landscape Cosmology: Eliminating Bizarreness
Creators: name: Clavelli, L.
name: Goldstein, Gary R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In what has become a standard eternal inflation picture of the string landscape there are many problematic consequences and a difficulty defining probabilities for the occurrence of each type of universe. One feature in particular that might be philosophically disconcerting is the infinite cloning of each individual and each civilization in infinite numbers of separated regions of the multiverse. Even if this is not ruled out due to causal separation one should ask whether the infinite cloning is a universal prediction of string landscape models or whether there are scenarios in which it is avoided. If a viable alternative cosmology can be constructed one might search for predictions that might allow one to discriminate experimentally between the models. We present one such scenario although, in doing so, we are forced to give up several popular presuppositions including the absence of a preferred frame and the homogeneity of matter in the universe. The model also has several ancillary advantages. We also consider the future lifetime of the current universe before becoming a light trapping region.
description: 13 pages, 1 figure, minor clarifications in version 2
Influence of backside metallization on a coplanar X-band LNA
Creators: name: Follmann, R.
name: Langgartner, G
name: Borkes, J.
name: Wolff, I.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: In this paper the influence of the backside metallization on a coplanar X-band low noise amplifier MMIC is described. First, we demonstrate the selection of transistor devices including the mod-elling especially with respect to the extraction of RF noise parame-ters. After that the simulation results and the layout of the LNA are presented, neglecting backside effects on coplanar circuits. Complet-ing measurements on the fabricated LNA show the influence of the backside metallization in comparison with simulation results.
Two approximations to the bound states of Dirac-Hulthen problem
Creators: name: Ikhdair, Sameer M.
name: Sever, Ramazan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The bound state (energy spectrum and two-spinor wave functions) solutions of the Dirac equation with the Hulthen potential for all angular momenta based on the spin and pseudospin symmetry are obtained. The parametric generalization of the Nikiforov-Uvarov method is used in the calculations. The orbital dependency (spin-orbit and pseudospin-orbit dependent coupling too singular 1/r^{2}) of the Dirac equation are included to the solution by introducing a more accurate approximation scheme to deal with the centrifugal (pseudo-centrifugal) term. The approximation is also made for the less singular 1/r orbital term in the Dirac equation for a wider energy spectrum. The nonrelativistic limits are also obtained on mapping of parameters.
description: 29 pages, 7 figures. arXiv admin note: text overlap with arXiv:hep-th/0503208
Quantum spherical model with competing interactions
Creators: name: Bienzobaz, P. F.
name: Salinas, S. R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We analyze the phase diagram of a quantum mean spherical model in terms of the temperature $T$, a quantum parameter $g$, and the ratio $p=-J_{2}/J_{1}$, where $J_{1}>0$ refers to ferromagnetic interactions between first-neighbor sites along the $d$ directions of a hypercubic lattice, and $J_{2}<0$ is associated with competing antiferromagnetic interactions between second neighbors along $m\leq d$ directions. We regain a number of known results for the classical version of this model, including the topology of the critical line in the $g=0$ space, with a Lifshitz point at $p=1/4$, for $d>2$, and closed-form expressions for the decay of the pair correlations in one dimension. In the T=0 phase diagram, there is a critical border, $g_{c}=g_{c}(p) $ for $d\geq2$, with a singularity at the Lifshitz point if $d
description: 18 pages, 3 figures, refs added, minor modifications to match published version
Orchestrating care : nursing practice with hospitalized older adults
Creators: name: Dahlke, Sherry
Publisher: name: University of British Columbia
Year: 2013

description: The majority of recipients of nursing care in Canadian hospitals are older adults; however, research about nurses’ knowledge of aging, beliefs about aging, and institutional contexts and their influence on nursing care practice with older adults remains limited. In this study, grounded theory methods, guided by symbolic interactionism, were used to explore nursing practice with hospitalized older adults. The theory orchestrating care was developed after analysis of 375 hours of participant observations and 35 interviews with 24 participants. The theory of orchestrating care explains how nurses are continuously trying to manage their work environment by understanding the status of the patients on their unit, mobilizing the assistance of others, and stretching available resources to resolve their problem of providing their patients with what they perceived as “good care” while sustaining themselves as “good” nurses in their practice that they described as hard, misunderstood, and under-resourced. They did this through the two subprocesses of building synergy and minimizing strain. Building synergy explains how nurses leverage and share information and gain the assistance of others. Minimizing strain explains how nurses use available resources, support and guide one another, and reframe their practices in ways that create a supportive nursing network. Nurses looked for allies as they developed their lines of action to resolve their problem in work environments they characterized as problematic. When they did not regard other care providers and leaders as allies, nurses focused on their top priority of safety and turned inward for support from other nurses in the hope of relieving their feelings of being overwhelmed, pressured, ignored, and misunderstood. Turning inward to resolve their problem both aided the nurses (by providing short-term relief) and inhibited them (by increasing their isolation). It also prevented them from articulating their challenges to their managers, from building synergy with other healthcare professionals, and from viewing their nursing team differently. Care of hospitalized older adults can be improved by listening to nurses who are working with this population, examining the hospital systems that constrain these nurses’ practice and from nurses critically reflecting on how their practices may be contributing to their challenges.
W-Band GaAs HEMT MMIC Subharmonically Pumped Diode Mixers with 20 GHz IF Bandwidth
Creators: name: Hwang, Yuh-Jing
name: Wang, Huei
name: Chu, Tah-Hsiung
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: Two subharmonically pumped (SHP) diode mixers are designed for wideband W-band RF frequencies, fixed LO frequency operation. These mixers are fabricated on a 4-mil substrate using 0.1- µµµµm GaAs MMIC process. Both simulation and test results show that the mixers are with 12.25 and 11.75 dB average conversion losses, respectively. Both mixers have IF bandwidth wider than 20 GHz. The conversion loss flatness of the symmetric circuit is within ±1.25 dB. To our knowledge, these are the state-of-the-art result on low-conversion-loss wideband MMIC SHP diode mixers.
QMA variants with polynomially many provers
Creators: name: Gharibian, Sevag
name: Sikora, Jamie
name: Upadhyay, Sarvagya
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Complexity (cs.CC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We study three variants of multi-prover quantum Merlin-Arthur proof systems. We first show that the class of problems that can be efficiently verified using polynomially many quantum proofs, each of logarithmic-size, is exactly MQA (also known as QCMA), the class of problems which can be efficiently verified via a classical proof and a quantum verifier. We then study the class BellQMA(poly), characterized by a verifier who first applies unentangled, nonadaptive measurements to each of the polynomially many proofs, followed by an arbitrary but efficient quantum verification circuit on the resulting measurement outcomes. We show that if the number of outcomes per nonadaptive measurement is a polynomially-bounded function, then the expressive power of the proof system is exactly QMA. Finally, we study a class equivalent to QMA(m), denoted SepQMA(m), where the verifier's measurement operator corresponding to outcome "accept" is a fully separable operator across the m quantum proofs. Using cone programming duality, we give an alternate proof of a result of Harrow and Montanaro [FOCS, pp. 633--642 (2010)] that shows a perfect parallel repetition theorem for SepQMA(m) for any m.
description: Minor changes. 22 pages, no figures
Intensity Mapping of Lyman-alpha Emission During the Epoch of Reionization
Creators: name: Silva, Marta B.
name: Santos, Mario G.
name: Gong, Yan
name: Cooray, Asantha
name: Bock, James
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We calculate the absolute intensity and anisotropies of the Lyman-alpha radiation field present during the epoch of reionization. We consider emission from both galaxies and the intergalactic medium (IGM) and take into account the main contributions to the production of Lyman-alpha photons: recombinations, collisions, continuum emission from galaxies and scattering of Lyman-n photons in the IGM. We find that the emission from individual galaxies dominates over the IGM with a total Lyman-alpha intensity (times frequency) of about (1.43-3.57)x10^{-8} erg s^{-1} cm^{-2} sr^{-1} at a redshift of 7. This intensity level is low so it is unlikely that the Lyman-αbackground during reionization can be established by an experiment aiming at an absolute background light measurement. Instead we consider Lyman-αintensity mapping with the aim of measuring the anisotropy power spectrum which has rms fluctuations at the level of 1 x 10^{-16} [erg s^[-1} cm^{-2} sr^{-1}]^2 at a few Mpc scales. These anisotropies could be measured with a spectrometer at near-IR wavelengths from 0.9 to 1.4 μm with fields in the order of 0.5 to 1 sq. degrees. We recommend that existing ground-based programs using narrow band filters also pursue intensity fluctuations to study statistics on the spatial distribution of faint Lyman-αemitters. We also discuss the cross-correlation signal with 21 cm experiments that probe HI in the IGM during reionization. A dedicated sub-orbital or space-based Lyman-αintensity mapping experiment could provide a viable complimentary approach to probe reionization, when compared to 21 cm experiments, and is likely within experimental reach.
description: 18 pages, 17 figures
A 6-18 GHz 5-Bit Phase Shifter MMIC Using Series/Parallel LC Circuit
Creators: name: Miyaguchi, Kenichi
name: Hieda, Morishige
name: Tarui, Yukinobu
name: Hatamoto, Mikio
name: Kanaya, Koh
name: Kasahara, Michiaki
name: Takagi, Tadashi
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: A high performance 6-18 GHz 5-bit reflection type phase shifter MMIC is presented. It employs a novel ultra-broad-band circuit design technique utilizing a series/parallel LC circuit for an 180 o phase shift over all frequencies. The fabricated phase shifter MMIC with SPDT switch suitable for T/R modules has demonstrated a typical insertion loss of 9.4 dB +/- 1.4 dB, a maximum RMS amplitude error of 0.33 dB and a maximum RMS phase error of 7 o over entire operating bandwidths.
Schismatocera Gautier des Cottes 1872
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Schismatocera

description: Schismatocera Gautier des Cottes, 1872
[1 species].
Type species Adoretus nitidulus Gautier des Cottes, 1870, by monotypy.
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 127, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Isospin breaking effects due to the up-down mass difference in Lattice QCD
Creators: name: de Divitiis, G. M.
name: Dimopoulos, P.
name: Frezzotti, R.
name: Lubicz, V.
name: Martinelli, G.
name: Petronzio, R.
name: Rossi, G. C.
name: Sanfilippo, F.
name: Simula, S.
name: Tantalo, N.
name: Tarantino, C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a new method to evaluate with high precision isospin breaking effects due to the small mass difference between the up and down quarks using lattice QCD. Our proposal is applicable in principle to any hadronic observable which can be computed on the lattice. It is based on the expansion of the path-integral in powers of the small parameter md-mu. In this paper, we apply this method to compute the leading isospin breaking effects for several physical quantities of interest: the kaon meson masses, the kaon decay constant, the form factors of semileptonic Kl3 decays and the neutron-proton mass splitting.
description: 30 pages, 17 plots, version accepted for publication in JHEP, added few references and some comment, results unchanged
Exotic B_c-like molecules in QCD Sum Rules
Creators: name: Albuquerque, Raphael M.
name: Liu, Xiang
name: Nielsen, Marina
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use the QCD sum rules to study possible $B_c$-like molecular states. We consider isoscalar $J^P = 0^+$ and $J^P = 1^+ D^{(\ast)}B^{(\ast)}$ molecular currents. We consider the contributions of condensates up to dimension eight and we work at leading order in $α_s$ . We obtain for these states masses around 7 GeV.
description: 7 pages, 6 figures. Accepted for publication in Physics Letters B. arXiv admin note: text overlap with arXiv:1110.2113
$\sinθ_{13}$ and neutrino mass matrix with an approximate flavor symmetry
Creators: name: Riazuddin
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: For a neutrino mass matrix whose texture has an approximate flavor symmetry and where one has near degenerate neutrino mass, it is shown that the tribimaximal values for atmospheric angle $\sin^{2}{θ_{23}}=1/2$ and solar angle $\sin^{2}{θ_{12}}=1/3$ can be maintained even when the reactor angle $θ_{13}\neq0$. The non zero $\sinθ_{13}$ implies approximate $ν_μ\rightarrow-ν_τ$ symmetry instead of $ν_μ\rightarrowν_τ$ symmetry.
description: 13 pages,2 figures, Published in JHEP
Baseband Predistortion Lineariser Using Direct Spline Computation
Creators: name: Acciari, G.
name: Giannini, F.
name: Limiti, E.
name: Rossi, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: A baseband predistorter is presented. Key features of the predistorter resides in the use of cubic splines interpolation to generate predistorted input data to the power amplifier, resulting in a reduction of computational effort with respect to traditional polynomial interpolators. Simulated behaviour of the proposed scheme is presented, demonstrating the effectiveness of the approach.
Local semicircle law in the bulk for Gaussian $β$-ensemble
Creators: name: Sosoe, Philippe
name: Wong, Percy
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60B20, 60K35

description: We use the tridiagonal matrix representation to derive a local semicircle law for Gaussian beta ensembles at the optimal level of $n^{-1+δ}$ for any $δ> 0$. Using a resolvent expansion, we first derive a semicircle law at the intermediate level of $n^{-1/2+δ}$; then an induction argument allows us to reach the optimal level. This result was obtained in a different setting, using different methods, by Bourgade, Erdös, and Yau and in Bao and Su. Our approach is new and could be extended to other tridiagonal models.
description: 31 pages, version 3 corrected typos and expanded sections 4-5
Analysis of the Doherty technique and application to a 900MHz power amplifier
Creators: name: Dubuc, Nicolas
name: Duvanaud, Claude
name: Bouysse, Ph.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: In this paper, we present the study, the realisation and the measurement of an amplifier at 900 MHz using the Doherty technique. This technique is based on the large signal performance analysis of the active devices under different drive levels. The improvements made by the application of this technique were checked by simulations and measurements on a prototype made with two MESFETs transistors. For a 6 dB backoff, obtaining significant values of Power Added Efficiency was possible thanks to the application of a methodology of design, specific to this technique.
Rutas textuales de la exclusión : raza y etnicidad en textos de enunciación andina del Perú colonial y republicano
Creators: name: Grillo Arbulú, María Teresa
Publisher: name: University of British Columbia
Year: 2013

description: My dissertation examines representations of ethnicity and race in narratives from the beginning of the conquest and colonization (XVI century) to the present, which I call “discourses of Andean enunciation” in Peru. These discourses are formulated, either orally or in writing, by Andean subjects ethnically self-identified as Indian/indigenous. In Latin American studies, emphasis has been given to notions such as “hybridity” and “mestizaje”, diminishing the relevance of the idea of race. Also, Andean authors’ rhetorical tools as strategies of resistance have been highlighted. My dissertation traces the inclusion and evolution of an idea of race in discourses by marginalized Andean subjects. The body of primary texts belongs to different periods starting from Spaniards’ arrival in the Andes to the present millennium: Instrucción al Licenciado don Lope García de Castro (1570) by Titu Cusi Yupanqui; El Primer Nueva Corónica y Buen Gobierno (1615) by Felipe Guamán Poma de Ayala; Representación verdadera ... (1750) by Fray Calixto Túpac Inca; Huillca. Habla un Campesino Peruano (1974), enunciated by Saturnino Huillca and edited by Hugo Neira Samanez and Hilos de mi Vida (2002) by Hilaria Supa Huamán. The corpus is analyzed from a diachronic perspective, in order to find continuities and ruptures in the ways race and ethnicity are represented. My working hypothesis suggests that an idea of race can be traced back to the beginnings of colonization and is imposed by the dominant society through discourses on religion and education. I argue that this idea is reformulated by Andean marginalized subjects of enunciation, who resist it and simultaneously incorporate some of its discoursive elements, thus revealing its impact as a mechanism of domination. The body of the dissertation is divided into three chapters, dealing with representations of the conquest and colonization, the decades before and after Tupac Amaru II’s revolution; and the contemporary period. The study of the primary texts is complemented with a review of other selected texts by Andean, Spanish and “criollo” or “mestizo” authors, in order to contextualize the emergence of the primary texts.
Power Amplifier Linearisation Through Generation and Injection of Low-Frequency Second-Order Nonlinear Products
Creators: name: Jenkins, William
name: Khanifar, Ahmad
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: This paper reports on a novel linearisation technique that is applicable to high power amplifiers used with digitally modulated single- or multi-carrier signals. The analysis, simulations and measured results demonstrate that improvements in distortion (ACPR, ACLR and EVM) can be achieved with a relatively small increase in signal processing overhead and minimal hardware complexity. This paper presents the underlying concept by applying frequency-domain analysis to an amplifier modelled by a truncated power series. The technique has been successfully applied to EDGE and QPSK-modulated carrier signals, and both simulation and measured results are presented.
Semienaria Dewailly 1950
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Semienaria

description: Semienaria Dewailly, 1950
[1 species].
Type species Semienaria descarpentriesi Dewailly, 1950, by original designation.
description: Published as part of Allsopp, Peter G. & Schoolmeesters, Paul, 2024, All genera of the world: Subfamilies Prototroginae, Cretoscarabaeinae, Dynamopodinae, Electrorubesopsinae, Phaenomeridinae, Orphninae, Allidiostomatinae, Aclopinae, Lichniinae, Melolonthinae, Oncerinae, Podolasiinae, Sericinae, Sericoidinae (Animalia: Arthropoda: Insecta: Coleoptera: Scarabaeidae), pp. 104-175 in Megataxa 12 (1) on page 127, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Resonance Plasmon Linewidth Oscillations in Spheroidal Metallic Nanoparticle Embedded in a Dielectric Matrix
Creators: name: Grigorchuk, Nicolas I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences
subject: J.2

description: The kinetic approach is applied to calculate oscillations of a surface plasmon linewidth in a spheroidal metal nanoparticle embedded in any dielectric media. The principal attention is focused on the case, when the free electron path is much greater than the particle size. The linewidth of the plasmon resonance as a function of the particle radius, shape, dielectric constant of the surrounding medium, and the light frequency is studied in detail. It is found that the resonance plasmon linewidth oscillates with increasing both the particle size and the dielectric constant of surrounding medium. The main attention is paid to the electron surface-scattering contribution to the plasmon decay. All calculations the plasmon resonance linewidth are illustrated by the example of the Na nanoparticles with different radii. The results obtained in the kinetic approach are compared with the known ones from other models. The role of the radiative damping is discussed as well.
description: 12 pages, 5 figuresm 1 table. arXiv admin note: substantial text overlap with arXiv:1210.5647
2.5 GHz Wide Band Linear Amplifier with Feedforward Lineariser on a Board
Creators: name: Kayano, Hiroyuki
name: Iwata, Satoru
name: Sato, Hiroaki
name: Iseki, Yuji
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: A wide band feedforward lineariser amplifier we have developed is described. In particular, we report the IM3 improvement obtained without automatic adaptive control circuits, indicating the possibility of realizing small, low-cost products. We designed a lineariser amplifier for 2.5 GHz band to demonstrate the effectiveness of our approach and measurement revealed the wide band linearising capability of over 100 MHz.
Enhanced implantable device evaluation using a hardware-in-the-loop circulatory simulator
Creators: name: Rapp, Ethan Stewart
name: 0000-0002-2596-4522
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Arrhythmia
Cardiovascular disorders
Electrocardiography
Heart excitation
Hybrid mock circulation loop
Medical control systems
Patient treatment
Physiological models
Systemic vascular resistance
VAD Estimation

description: As the number of patients experiencing severe heart failure increases, so too does the need and use of implantable mechanical circulatory support devices, such as ventricular assist devices (VADs) and total artificial hearts (TAHs), for patient treatment. These devices assist the failing heart by taking over the blood pumping process either partially or completely and must be properly vetted and verified for human use by undergoing many years of testing, both using in vitro benchtop and in vivo animal testing. To expedite the laboratory testing process, hardware-in-the-loop (HIL) systems called mock circulation loops (MCLs) have been developed that can test assist devices within a mechanical realization of the human cardiovascular environment. This research focuses on the evaluation of nominal and enhanced VAD function using a hybrid mock circulation loop (hMCL) as a HIL test platform. The research can be split into three major aims: (1) hMCL construction and performance characterization for nominal VAD testing, (2) hMCL based evaluation of enhanced VAD onboard estimation algorithms, (3) Method for HIL implementation of arrhythmic and VAD induced cardiac events in hMCL. Regarding Aim 1, test results of the current hMCL design show that root-mean-square error between simulated and realized physiological pressures across a range of VAD flowrates can be maintained within 1.5-3.5 [mmHg]. The hMCL is able to simulate different levels of patient cardiovascular health and basic sensitivity tests indicate responsiveness to changes in the simulated model parameters; a necessary requirement to accomplish Aim 2. Completed work towards Aim 2 involves evaluating the onboard sensing algorithms being developed on VADs using sensor-based estimation of systemic vascular resistance (SVR) as an example. Preliminary experiments using the hMCL showed that SVR value estimates were accurate within 1.3% and 0.7% compared to the set numerical model values for tests run on continuous and pulsatile flow VADs, respectively. Lastly, methods for incorporating arrhythmic cardiac events and valvular stenosis have been presented towards Aim 3. Preliminary results show less than 2% and 4% mean percent error between aortic and left ventricular pressure tracking, respectively, as well as good agreement between referenced and measured frequency content.
Identifying the Neutrino mass Ordering with INO and NOvA
Creators: name: Blennow, Mattias
name: Schwetz, Thomas
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The relatively large value of $θ_{13}$ established recently by the Daya Bay reactor experiment opens the possibility to determine the neutrino mass ordering with experiments currently under construction. We investigate synergies between the NOvA long-baseline accelerator experiment with atmospheric neutrino data from the India-based Neutrino Observatory (INO). We identify the requirements on energy and direction reconstruction and detector mass for INO necessary for a significant sensitivity. If neutrino energy and direction reconstruction at the level of 10% and 10 degree can be achieved by INO a determination of the neutrino mass ordering seems possible around 2020.
description: 18 pages, 8 figures, minor improvements and clarifications, new panel in fig. 7, version to appear in JHEP, typo in eq. 4 corrected
The Hawking-Unruh phenomenon on graphene
Creators: name: Iorio, Alfredo
name: Lambiase, Gaetano
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We find that, for a very specific shape of a monolayer graphene sample, a general relativistic-like description of a back-ground spacetime for graphene's conductivity electrons is very natural. The corresponding electronic local density of states is of finite temperature. This is a Hawking-Unruh effect that we propose to detect through an experiment with a Scanning Tunneling Microscope.
description: 7 pages, 2 figures; insignificant changes to fit the letter format; it matches published version; Physics Letters B (2012)
Lagrangian mechanics of massless superparticle on AdS_4 x CP^3 superbackground
Creators: name: Uvarov, D. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Massless superparticle model is considered on the OSp(4|6)/(SO(1,3) x U(3)) supercoset manifold and in the AdS_4 x CP^3 superspace. In the former case integrability of the equations of motion is rather obvious, while for the AdS_4 x CP^3 superparticle we prove integrability in the partial kappa-symmetry gauge for which 4 anticommuting coordinates related to the broken conformal supersymmetry are set to zero. This allows us to propose expression for the Lax pair that may encode complete equations of motion for the AdS_4 x CP^3 superparticle.
description: LaTeX, 16 pages. v2: minor improvements in the text, typos corrected, reference added. Version accepted to Nucl. Phys. B
A broadband microstrip to waveguide transition for FR4 multilayer PCBs up to 50 GHz
Creators: name: Buoli, Carlo
name: Gadaleta, Vito Marco
name: Turillo, Tommaso
name: Zingirian, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: A broadband microstrip-to-waveguide transition has been studied and tested for low-cost microwave circuits on FR4 multilayer boards having an internal thick metal plate (1). It is obtained, at first, milling a slot in a thick metal plate. Subsequently the PCB is built up, using standard PCB process, inserting the thick metal plate as the second layer. In this way the slot results filled with FR4 prepreg. A further simple milling process removes the lower layers up to the thick metal plate and creates a part of the waveguide transformer and an area for plate to metal housing connection. The transition integration in the multilayer is obtained just fixing the board on the metal housing which includes the rest of the transformer and the waveguide. Moreover, as the transition shows low sensitivity to manufacturing tolerances, the above process is characterised by high reliability and reproducibility.
An optimized agonist peptide of protease-activated receptor 4 and its use in a validated platelet-aggregation assay
Creators: name: Yang, Jing
name: Mapelli, Claudio
name: Wang, Zhaoqing
name: Sum, Chi Shing
name: Hua, Ji
name: Lawrence, R. Michael
name: Ni, Yan
name: Seiffert, Dietmar A.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: Medicine
subject: Neuroscience
subject: Pharmacology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Cancer
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Protease-activated receptor 4 (PAR4) is a promising drug target to improve the efficacy/safety window of antiplatelet agents. The native peptide GYPGQV, and the more-potent peptide AYPGKF, are PAR4-specific activators. However, these PAR4 agonist peptides (APs) elicit an agonist response, for example, platelet aggregation, at concentrations of 50 to 1000 µM in platelet-function assays, thereby limiting their utility to monitor the pharmacodynamic effects of PAR4 antagonists over a wide concentration range. Improved pharmacodynamic assays are needed for clinical development of PAR4 antagonists. We attempted to identify potent PAR4 APs to aid development of robust assays for optimization of PAR4 antagonists. Using an AYPG-based biased phage-display peptide library approach followed by chemical peptide optimization, A-Phe(4-F)-PGWLVKNG was identified. This peptide demonstrated an EC50 value of 3.4 µM in a platelet-aggregation assay, which is 16-fold more potent than AYPGKF. Using this new PAR4 AP, a platelet-rich plasma-aggregation assay using light-transmission aggregometry was developed and validated in a series of precision and reproducibility tests. PAR4 antagonist responses to PAR4 AP A-Phe(4-F)-PGWLVKNG (12.5 µM to 100 µM) were subsequently evaluated in this assay in vitro and ex vivo in a human study using BMS-986120, a PAR4 antagonist that entered clinical studies.
Broken passivity and time-reversal-symmetry bounds in acoustics devices
Creators: name: Rasmussen, Curtis Paul
name: 0000-0002-4595-6247
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Acoustics
Metamaterials
Wave radiation

description: We collect information about the world through our senses, two of which, hearing and touch, are attuned to the mechanical vibrations travelling around us. Scientists and engineers have learned to control these acoustic waves, and in so doing they have opened new possibilities in how we interact with each other and the natural world. One area of rapid progress is acoustic metamaterials, which are architected structures that can shape sound waves in ways that go beyond what is possible with natural materials. Given the potential of these new materials, it is important to consider their limits and identify the underlying physical principles responsible for them. In this dissertation we examine limitations in the response of acoustic materials and devices due to passivity and time-reversal symmetry. An important constraint that arises due to time-reversal symmetry is reciprocity. Reciprocity must be broken to create devices that allow sound through in only one direction. This work explores acoustic nonreciprocity with particular attention to applications in surface acoustic wave devices and topological acoustic demonstrations. One way to achieve acoustic nonreciprocity is with fluid flow. Based on this technique, we present an acoustic Mach-Zehnder isolator and nonreciprocal leaky-wave antenna. A different but equally fundamental and important constraint in acoustics technology is the trade-off between the size, efficiency, and bandwidth of a small resonator. By considering arbitrary stored and radiated sound fields surrounding a compact source, we derive a theoretical lower bound on the quality factor of a passive acoustic radiator. This work discusses opportunities to overcome this constraint by considering active resonators. We experimentally demonstrate a three-fold bandwidth improvement to the passive case by synthesizing a non-Foster circuit load for a piezoelectric sonar transducer. By using a Green’s function approach and by connecting the physics of a disordered array to the statistical theory of random walks, we also explore the physics of near-zero-index materials, and leverage their unusual sound-matter interactions to enable robust and highly directive acoustic sources. This work introduces an entirely new way to achieve highly directional sound beyond traditional techniques.