cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A Simple Parallel-Plate Resonator Technique for Microwave. Characterization of Thin Resistive Films
Creators: name: Vorobiev, A.
name: Deleniv, A.
name: Talanov, V.
name: Gevorgian, S.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: A parallel-plate resonator method is proposed for non-destructive characterisation of resistive films used in microwave integrated circuits. A slot made in one of the plates is used to measure surface impedance of a reference film and film under test. The surface impedance of the film under test is extract from these two measurements using a simple procedure. X-band experimental verification is given for a number of resistive films.
Multi-objective geometric programming problem under uncertainty
Creators: name: MANDAL, Wasim Akram
name: ISLAM, Sahidul
Publisher: name: Wrocław University of Technology, Wrocław University of Economics, Polish Operational and Systems Research Society
Year: 2017
Subjects: uncertainty theory, uncertain variable, linear, normal, zigzag uncertainty distribution, multi-objective geometric programming

description: OPERATIONS RESEARCH AND DECISIONS; ISSN 2081-8858
Asiactenius Nikolajev 2000
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Asiactenius

description: Asiactenius Nikolajev, 2000b
[5 species].
Type species Asiactenius afghanus Nikolajev, 2000, 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 135, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Dynamics of Thermal Effects in the Spin-Wave Theory of Quantum Antiferromagnets
Creators: name: Rivas, Ángel
name: Martin-Delgado, Miguel A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We derive a master equation that allows us to study non-equilibrium dynamics of a quantum antiferromagnet. By resorting to spin-wave theory, we obtain a closed analytic form for the magnon decay rates. These turn out to be closely related to form factors, which are experimentally accessible by means of neutron and Raman scattering. Furthermore, we compute the time evolution of the staggered magnetization showing that, for moderate temperatures, the magnetic order is not spoiled even if the coupling is fully isotropic.
description: Revtex4 file, color figures. Published version
Atanyproctus Petrovitz 1954
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Atanyproctus

description: Atanyproctus Petrovitz, 1954
[6 species].
Type species Atanyproctus simplicitarsis Petrovitz, 1954, 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 135, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
GaAs application specific MMICs for a HIPERLAN MCM
Creators: name: Devlin, L.
name: Buck, B. J.
name: Clifton, J. C.
name: Dearn, A.W.
name: Geen, M. W.
name: Long, A. P.
name: Melvin, S. P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: HIPERLAN (High Performance Radio Local Area Networks) is an emerging European standard for wireless local area networks with an in air data rate of 23.5 Mbits/sec. This paper details the design manufacture and measured performance of two application specific GaAs MMICs which form the majority of the 5.2 GHz RF front end. One MMIC is a power amplifier with level control and the other is an up/down-converter with on chip VCO. These are the first GaAs MMICs designed specifically for the HIPERLAN standard.
Phylogenetic mixtures: Concentration of measure in the large-tree limit
Creators: name: Mossel, Elchanan
name: Roch, Sebastien
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Data Structures and Algorithms (cs.DS)
subject: Statistics Theory (math.ST)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: The reconstruction of phylogenies from DNA or protein sequences is a major task of computational evolutionary biology. Common phenomena, notably variations in mutation rates across genomes and incongruences between gene lineage histories, often make it necessary to model molecular data as originating from a mixture of phylogenies. Such mixed models play an increasingly important role in practice. Using concentration of measure techniques, we show that mixtures of large trees are typically identifiable. We also derive sequence-length requirements for high-probability reconstruction.
description: Published in at http://dx.doi.org/10.1214/11-AAP837 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Design approaches for oscillators in low microwave bands
Creators: name: Pascual, J.P.
name: Portilla, J.
name: Artal, E.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: Several design procedures for oscillators are proposed and compared with commercial CAD tools and finally with measurements of fabricated voltage controlled MMIC prototypes. All of the proposed design techniques are easy to implement in any CAD package, or even to code in any Language. They provide, not only appropriate initial values for the components in more complete simulations, but also accurate final results. Measurements permit the validation of the whole design process, the models and the technology used. The Philips GaAs ER07AD process (Limeil, Paris) has been employed.
The extracellular role of granzyme B in abdominal aortic aneurysm
Creators: name: Ang, Lisa Shouning
Publisher: name: University of British Columbia
Year: 2014

description: Background: Abdominal aortic aneurysm (AAA) is an age-related disease characterized by progressive degradation of elastic lamellae, defective collagen architecture and medial smooth muscle cell loss. We previously demonstrated that knocking out the serine protease granzyme B (GZMB) reduces incidence and severity of AAA in mice; however, while GZMB is known for its role in apoptosis, it also accumulates extracellularly during inflammation and can cleave extracellular matrix (ECM) components such as decorin and fibrillin-1. We hypothesized that GZMB contributes to AAA development through the degradation of vascular ECM and that the inhibition of extracellular GZMB would reduce the incidence and severity of AAA progression.Methods: Human aneurysmal samples were obtained and apolipoprotein E(apoE)-knockout (KO), GZMB/apoE-double knockout (GDKO) and perforin/apoE-DKO (PDKO) mice were implanted with osmotic minipumps releasing angiotensin II for 28 days to induce AAA formation. Additional apoE-KO mice were injected with the GZMB inhibitor, serpin A3N (SA3N, 4-120 μg/kg) or anti-GZMB neutralizing antibody (1 mg/kg) prior to pump implantation. Tissues were assessed for aneurysm pathology, inflammation and ECM composition. Collagen content was analysed by second harmonic generation and transmission electron microscopy.Results: Human aneurysmal tissues showed elevated levels of GZMB immunopositivity compared to controls. A significant reduction in AAA incidence and severity was observed in GDKO mice compared to apoE-KO, whereas perforin deficiency was not protective against AAA. A dose-dependent reduction in the frequency of aortic rupture was observed in mice that received SA3N or anti-GZMB antibody treatment. Pre-incubation with SA3N prevented decorin cleavage by GZMB in vitro. Reduced GZMB and a corresponding reduction in loss of adventitial decorin were observed in SA3N and anti-GZMB-treated mice while collagen density was increased. Adventitial collagen from SA3N-treated mice exhibited significantly higher fibre density and reduced fibril size irregularity.Conclusions: GZMB promotes destruction of the elastic lamellae via degradation of fibrillin-1 and destabilization of elastic microfibrils while GZMB-mediated degradation of decorin contributes to loss of adventitial collagen organization and density. The extracellular inhibition of GZMB prevented decorin loss and enabled a beneficial remodelling of adventitial collagen in response to medial injury, leading to higher vessel tensile strength and increased resistance to aortic rupture.
Long-range gravitational-like interaction in a neutral atomic cold gas
Creators: name: Chalony, Maryvonne
name: Barre, J.
name: Marcos, B.
name: Olivetti, A.
name: Wilkowski, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A quasi-resonant laser induces a long-range attractive force within a cloud of cold atoms. We take advantage of this force to build in the laboratory a system of particles with a one-dimensional gravitational-like interaction, at a fluid level of modeling. We give experimental evidences of such an interaction in a cold Strontium gas, studying the density profile of the cloud, its size as a function of the number of atoms, and its breathing oscillations.
description: 4 pages, 4 figures. Published in PRA 87, 013401 (2013)
A tuneable GaAs MMIC band stop filter at X-band with a novel active inductor
Creators: name: Tieman, T.C.B.
name: Van Vliet, F.E.
name: Van Den Bogaart, F.L.M.
name: Tauritz, J.L.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: The design and performance of two tuneable GaAs MMIC band stop filters is presented. The first filter was designed to demonstrate the excellent properties of the resonating tank consisting of a varactor diode and a novel active inductor. On the basis of the first filter, a second filter is designed with improved performance, with respect to gain, noise figure and bandwidth. This filter is tuneable from 9 to 11 GHz, with a notch depth of more than 25 dB. The filter exhibits a gain of 4 dB which is flat within 0.5 dB from 6 to 18 GHz. The -10dB notch bandwidth amounts to 60 MHz for a 10 GHz centre frequency. Large-signal behaviour was investigated and hence we believe to report the first fully characterised MMIC tuneable narrow band stop filter at X-band.
Maximum hitting for n sufficiently large
Creators: name: Barber, Ben
Publisher: name: arXiv
Year: 2012
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05D05

description: For a left-compressed intersecting family \A contained in [n]^(r) and a set X contained in [n], let \A(X) = {A in \A : A intersect X is non-empty}. Borg asked: for which X is |\A(X)| maximised by taking \A to be all r-sets containing the element 1? We determine exactly which X have this property, for n sufficiently large depending on r.
description: Version 2 corrects the calculation of the sizes of the set families appearing in the proof of the main theorem. It also incorporates a number of other smaller corrections and improvements suggested by the anonymous referees. 7 pages
Controllable quantum correlations of two-photon states generated using classically driven three-level atoms
Creators: name: Dhar, Himadri Shekhar
name: Banerjee, Subhashish
name: Chatterjee, Arpita
name: Ghosh, Rupamanjari
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We investigate the dynamics of two-photon correlations generated by the interaction of a three-level atom in the $Ξ$, $Λ$ or V configuration, with two classical external driving fields, under the rotating-wave approximation, in the presence of level decays. Using the example of a rubidium atom in each configuration, with field strengths validating the single-photon approximation, we compute measurement based correlations, such as measurement induced disturbance (MID), quantum discord (QD), and quantum work deficit (WD), and compare the results with that of quantum entanglement (concurrence). Certain correlation properties observed are generic, model independent and consistent with known results, e.g., MID is an upper bound on QD, QD and WD are monotonic, and the generic correlation behavior is strongly affected by the purity of the photon states. We observe that the qualitative hierarchy, monotonicity and steady-state behavior of the correlations can be controlled by the choice of parameters such as atomic decay constants and external driving field strengths. We point out how particular configurations are better suited at generating monotonic correlations in specific regimes and how the steady-state correlation behavior and hierarchy are affected by the population dynamics of the density matrix for different parameters. The possibility of using well studied quantum optical systems such as the three-level atom to generate, characterize and parametrically control mixed state quantum correlations establishes an important step in the direction of their implementation in quantum information tasks.
description: 13 pages, 6 figures, elsarticle, final accepted version
Application of GaAs power devices to very - high - frequency and high - efficiency DC to DC power converters
Creators: name: Ajram, S.
name: Kozlowski, Romain
name: Van De Velde, Jean Claude
name: Salmer, Georges
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: In this paper a novel possibility to obtain dc-to-dc converters with high efficiency using GaAs MESFET switches is provided. A comparison with standard MOSFET is presented and solutions for reactive element, diode, and driver are proposed. Finally we give an experimental result for hybrid prototype 5V/10V-100MHz converter with an output power of 5W and a power efficiency of 76%.
Voevodsky's motives and Weil reciprocity
Creators: name: Kahn, Bruno
name: Yamazaki, Takao
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We describe Somekawa's K-group associated to a finite collection of semi-abelian varieties (or more general sheaves) in terms of the tensor product in Voevodsky's category of motives. While Somekawa's definition is based on Weil reciprocity, Voevodsky's category is based on homotopy invariance. We apply this to explicit descriptions of certain algebraic cycles.
description: Revised version; the title and introduction were changed. arXiv admin note: substantial text overlap with arXiv:1009.4554
China’s changing diet and its impacts on greenhouse gas emissions: an index decomposition analysis
Creators: name: Hawkins, Jacob
name: Ma, Chunbo
name: Schilizzi, Steven
name: Zhang, Fan
name: Hawkins, Jacob
name: Ma, Chunbo
name: Schilizzi, Steven
name: Zhang, Fan
Publisher: name: Unknown
Year: 2018
Subjects: subject: Environmental Economics and Policy
subject: China
subject: dietary change
subject: embodied emissions in trade
subject: greenhouse gas emissions
subject: index decomposition analysis
subject: logarithmic mean Divisia index

description: With increasing awareness of agriculture’s contribution to global greenhouse gases (GHGs) and China’s position as the world’s top GHG emitter, there is heightened attention to the embodied emissions in China’s food consumption. China’s diet has shifted to include more fruit, vegetables, meat and dairy. Not surprisingly, GHG emissions from food consumption have also increased substantially. This analysis links China’s food consumption with the emissions of food production industries in China and its trade partners to determine the effects of dietary change on GHGs since 1989. We utilise high-resolution food production and emissions data to perform a logarithmic mean Divisia index decomposition to attribute changes in GHG emissions to the scale, supply structure, demand structure and efficiency effects resulting from Chinese dietary changes over a 20-year period. This study finds that while countries supplying food to China contribute little to China’s food-related GHGs, demands for meat and dairy play a much larger role, driving up emissions. The overall scale of increased consumption of all food further propels growth in GHG emissions. Results indicate, however, that while food consumption in China more than doubles between 1989 and 2009 improvements in technological efficiency limit the rate of increase.
High performance MMICs for automotive radar application at 77 GHz
Creators: name: Camiade, M.
name: Dourlens, C.
name: Serru, V.
name: Savary, P.
name: Blanc, J.C
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: A set of functions and multifunctions has been developed using 0.25 um HEMT and 0.15 um pseudomorphic HEMT processes for automotive radar application at 77 GHz. The main objective of this work was to appreciate which performances can be reached on these processes for high volume applications. A large number of functions were considered in order to be able to fullfil several radar block diagram requirements (FMCW, pulsed, homodyne, heterodyne...). A set of high performance functions has been realised for frequency generation, transmission and reception circuits.
Kinetic instabilities that limit β in the edge of a tokamak plasma: a picture of an H-mode pedestal
Creators: name: Dickinson, D.
name: Roach, C. M.
name: Saarelma, S.
name: Scannell, R.
name: Kirk, A.
name: Wilson, H. R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Plasma equilibria reconstructed from the Mega-Amp Spherical Tokamak (MAST) have sufficient resolution to capture plasma evolution during the short period between edge-localized modes (ELMs). Immediately after the ELM steep gradients in pressure, P, and density, ne, form pedestals close to the separatrix, and they then expand into the core. Local gyrokinetic analysis over the ELM cycle reveals the dominant microinstabilities at perpendicular wavelengths of the order of the ion Larmor radius. These are kinetic ballooning modes (KBMs) in the pedestal and microtearing modes (MTMs) in the core close to the pedestal top. The evolving growth rate spectra, supported by gyrokinetic analysis using artificial local equilibrium scans, suggest a new physical picture for the formation and arrest of this pedestal.
description: Final version as it appeared in PRL (March 2012). Minor improvements include: shortened abstract, and better colour table for figures. 4 pages, 6 figures
Brenskeiella Berg 1898
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Brenskeiella

description: Brenskeiella Berg, 1898
[1 species].
Replacement name for Pachychaeta Brenske, 1896d, not Pachychaeta Loew, 1845, Pachychaeta Verrall, 1882, nor Pachychaeta Bezzi, 1906.
Note: Dalla Torre (1913) incorrectly spelt Brenskeiella as “ Brenskiella ”.
Pachychaeta Brenske, 1896d.
Type species Pachychaeta flavomicans Brenske, 1896, 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 135, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Faraday rotation in graphene
Creators: name: Fialkovsky, I. V.
name: Vassilevich, D. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study magneto--optical properties of monolayer graphene by means of quantum field theory methods in the framework of the Dirac model. We reveal a good agreement between the Dirac model and a recent experiment on giant Faraday rotation in cyclotron resonance. We also predict other regimes when the effects are well pronounced. The general dependence of the Faraday rotation and absorption on various parameters of samples is revealed both for suspended and epitaxial graphene.
description: 10 pp; v2: typos corrected and references added, v3, v4: small changes and more references
Mitigating rice production risks from drought through improving irrigation infrastructure and management in China
Creators: name: Wang, Yangjie
name: Huang, Jikun
name: Wang, Jinxia
name: Findlay, Christopher
name: Wang, Yangjie
name: Huang, Jikun
name: Wang, Jinxia
name: Findlay, Christopher
Publisher: name: Unknown
Year: 2018
Subjects: subject: Risk and Uncertainty
subject: adaptation
subject: China
subject: drought risk
subject: irrigation
subject: rice

description: Rice, China’s most important food crop, is highly dependent on irrigation, but an increasing number of extreme drought events have challenged rice production in many regions. This paper investigates the role of local irrigation infrastructure in improving farmers’ ability to respond to drought and its effectiveness in mitigating the drought risk in rice production in China. The analysis relies on a moment-based specification of the stochastic production function, capturing mean, variance and skewness effects. Using household survey data from 86 villages in five provinces, we jointly estimate farmers’ adaptive irrigation decisions and their effects on rice yield and production risk. Our econometric analyses show that irrigation infrastructure in villages contributes to enhancing farmers’ irrigation capacity in adapting to drought, and increased irrigation leads to a significant increase in mean yield and a reduction in exposure to risk as well as downside risk in rice production. The paper concludes with policy implications.
Somatic evolution in human blood and colon
Creators: name: Lee-Six, Henry
Publisher: name: Apollo - University of Cambridge Repository
Year: 2019
Subjects: Cancer
mutation
evolution
somatic
mutational signature
stem cell

description: All cancers were once normal cells. They became cancerous through the chance acquisition of particular somatic mutations that gave them a selective advantage over their neighbours. Thus, the mutations that initiate cancer occur in normal cells, and the normal clonal dynamics of the tissue determine a mutant cell’s ability to establish a malignant clone; yet these remain poorly understood in humans. One tissue was selected for the exploration of each of these two facets of somatic evolution: blood for clonal dynamics; colon for mutational processes. Blood presents an opportunity to study normal human clonal dynamics, as clones mix spatially and longitudinal samples can be taken. We isolated 140 single haematopoietic stem and progenitor cells from a healthy 59 year-old and grew them in vitro into colonies that were whole genome sequenced. Population genetics approaches were applied to this dataset, allowing us to elucidate for the first time the number of active haematopoietic stem cells, the rate at which clones grow and shrink, and the cellular output of stem cell clones. Colonic epithelium is organised into crypts, at the base of which sit a small number of stem cells. All cells in a crypt ultimately share an ancestor in one stem cell that existed recently, and consequently share the mutations that were present in this ancestor. We exploited this natural clonal unit, isolating single colonic crypts through laser capture microdissection. 570 colonic crypts from 42 individuals were whole genome sequenced. We describe the burden and pattern of somatic mutations in these genomes and their variability across and within different people, identifying some mutational processes that are ubiquitous and others that are sporadic. Targeted sequencing of an additional 1,500 crypts allowed us to quantify the frequency of driver mutations in normal human colon. Together, these two studies inform on the somatic evolution of normal tissues, describing new biology in human tissue homeostasis and providing a window into the processes that govern cancer incidence.
description: Funded by the Wellcome Sanger Institute.
Nonlinear Krylov Acceleration Applied to a Discrete Ordinates Formulation of the k-Eigenvalue Problem
Creators: name: Calef, Matthew T.
name: Fichtl, Erin D.
name: Warsa, James S.
name: Berndt, Markus
name: Carlson, Neil N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We compare variants of Anderson Mixing with the Jacobian-Free Newton-Krylov and Broyden methods applied to an instance of the k-eigenvalue formulation of the linear Boltzmann transport equation. We present evidence that one variant of Anderson Mixing finds solutions in the fewest number of iterations. We examine and strengthen theoretical results of Anderson Mixing applied to linear problems.
description: This final revision includes results of the C5G7-MOX problem; Nonlinear Krylov Acceleration Applied to a Discrete Ordinates Formulation of the k-Eigenvalue Problem, Accepted by the Journal of Computational Physics December 2012
New GaAs infrared detector
Creators: name: Asmontas, S.
name: Gradauskas, J.
name: Seliuta, D.
name: Silenas, A.
name: Sirmulis, E.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: We report our results of experimental study of photovoltage induced by pulsed CO2 laser in GaAs p-n and 1-h junctions. We demonstrate that photoemission of hot carriers across the potential barrier and the crystal lattice heating are the dominant mechanisms in the photovoltage formation. The obtained results show that hot-carrier effects in inhomogeneous GaAs can be used to detect very short infrared laser pulses.
Mobility-Oriented Data Retrieval for Computation Offloading in Vehicular Edge Computing
Creators: name: Soto Garcia, Victor
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2019
Subjects: Vehicular Edge Computing
Data Retrieval
Wireless Communications
Vehicular Networks

description: Vehicular edge computing (VEC) brings the cloud paradigm to the edge of the network, allowing nodes such as Roadside Units (RSUs) and On-Board Units (OBUs) in vehicles to perform services with location awareness and low delay requirements. Furthermore, it alleviates the bandwidth congestion caused by the large amount of data requests in the network. One of the major components of VEC, computation offloading, has gained increasing attention with the emergence of mobile and vehicular applications with high-computing and low-latency demands, such as Intelligent Transportation Systems and IoT-based applications. However, existing challenges need to be addressed for vehicles' resources to be used in an efficient manner. The primary challenge consists of the mobility of the vehicles, followed by intermittent or lack of connectivity. Therefore, the MPR (Mobility Prediction Retrieval) data retrieval protocol proposed in this work allows VEC to efficiently retrieve the output processed data of the offloaded application by using both vehicles and road side units as communication nodes. The developed protocol uses geo-location information of the network infrastructure and the users to accomplish an efficient data retrieval in a Vehicular Edge Computing environment. Moreover, the proposed MPR Protocol relies on both Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communication to achieve a reliable retrieval of data, giving it a higher retrieval rate than methods that use V2I or V2V only. Finally, the experiments performed show the proposed protocol to achieve a more reliable data retrieval with lower communication delay when compared to related techniques.
The principle of stationary action in the calculus of variations
Creators: name: López, E.
name: Molgado, A.
name: Vallejo, J. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 49K15, 49S05, 34K11

description: We review some techniques from non-linear analysis in order to investigate critical paths for the action functional in the calculus of variations applied to physics. Previous attempts to analyse when these are minima ex- ist, but mainly based on physical reasoning and only for a restricted class of models. Our main intention in this regard is to develop precise mathematical conditions for critical paths to be minimum solutions in a variety of situations. Our claim is that, with a few techniques, a systematic analysis (including the domain for which critical points are genuine minima) of non-trivial models is possible. We present specific models arising in modern physical theories in order to make clear the ideas here exposed.
description: Corrected version (minor typos and added acknowledgements). To appear in Communications in Mathematics, vol 2 2012
InP-based monolithically integrated photoreceiver for 4-10GBit/S optoelectronic systems
Creators: name: Horstmann, M.
name: Hardtdegen, M.
name: Schimpf, K.
name: Muttersbach, J.
name: Lehmann, R.
name: Marso, M.
name: Kordos, P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: A novel monolithically integrated photoreceiver for 10Gbit/s long-haul optoelectronic transmission systems is presented. The photoreceiver consists of a MSM photodetector and a HEMT amplifier, prepared on an identical InGaAs/InP 2DEG layer structure. The design considerations, preparation procedure and optoelectronic properties of discrete devices and results on a front-end receiver at 1.3um are presented. The MSM photodetector exhibits a responsivity of 0.21A/W and a 3dB bandwidth up to 16GHz. The HEMT amplifiers have a cut-off frequency fT of 45GHz and fmax of 85GHz. A bandwidth up to 16GHz is achievable on optimized photoreceiver circuits.
SiGe/Si quantum dot electron spin decoherence dependence on $^{73}$Ge
Creators: name: Witzel, Wayne M.
name: Rahman, Rajib
name: Carroll, Malcolm S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We theoretically study the nuclear spin induced decoherence of a quantum dot in Si that is confined at a SiGe interface. We calculate decoherence time dependence on $^{73}$Ge in the barrier layer to evaluate the importance of Ge as well as Si enrichment for long decoherence times. We use atomistic tight-binding modeling for an accurate account of the electron wavefunction which is particularly important for determining the contact hyperfine interactions with the Ge nuclear spins. We find decoherence times due to Ge spins at natural concentrations to be milliseconds. This suggests SiGe/Si quantum dot devices employing enriched Si will require enriched Ge as well in order to benefit from long coherence times. We provide a comparison of $T_2$ times for various fractions of nonzero spin isotopes of Si and Ge.
Measurement of stock market liquidity supported by an algorithm inferring the initiator of a trade
Creators: name: OLBRYŚ, Joanna
name: MURSZTYN, Michał
Publisher: name: Wrocław University of Technology, Wrocław University of Economics, Polish Operational and Systems Research Society
Year: 2017
Subjects: insolvency, models of bankruptcy prediction, manufacturing sector

description: OPERATIONS RESEARCH AND DECISIONS; ISSN 2081-8858
Current gain mechanism in planar GaAs MESFETs due to new photovoltaic self-biasing edge-effect.
Creators: name: Abbott, Derek
name: Eshraghian, K.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: A significant new internal gain effect, in planar MES­FETs has been discovered which we call the "photo­voltaic self-biasing edge-effect." The edge-effect can be exploited to attain up to a factor of ten improvement in detector photosensitivity.
STAT6 and STAT4 in murine atherosclerosis
Creators: name: Tai, Daven C H
Publisher: name: University of British Columbia
Year: 2013

description: Atherosclerosis is a chronic inflammatory condition and the major underlying cause of heart attacks and strokes. Since the immune system is paramount in all stages of atherosclerosis, modulating the immune response is an attractive therapeutic strategy for atherosclerotic disease. Signal transducers and activators of transcription (STAT) 6 and STAT4 are essential orchestrators of the anti-inflammatory Th2 response and the pro-inflammatory Th1 response, respectively. Using bone marrow transplantation to deplete STAT6 and STAT4 expression in specific immune compartments in low density lipoprotein receptor knockout (Ldlr-/-) mice, we investigated the validity of modulating the immune response through STAT6 and STAT4 as a prospective treatment strategy for atherosclerosis. We found that myeloid-specific STAT6 depletion did not significantly impact atherosclerotic lesion area or stability in Ldlr-/- mice fed an atherogenic diet for 8 or 14 weeks. In addition, hematopoiesis in the myeloid and lymphoid lineages was not significantly affected by the absence of myeloid STAT6. In contrast, total hematopoietic system STAT4 depletion profoundly exacerbated atherosclerotic lesion area and vulnerability in Ldlr-/- mice following 8 weeks of atherogenic diet. Hematopoietic perturbations in mice transplanted with STAT4-deficient bone marrow are highly reminiscent of interferon (IFN)-gamma-dependent effects on immune cell development in interleukin-12-treated mice, suggesting that IFN-gamma levels may be elevated in response to hypercholesterolemia in the absence of STAT4. Myeloid-specific STAT4-deficient mice also developed larger atherosclerotic lesions in the aortic root, providing evidence that even partial STAT4 insufficiency can potentially accelerate atherosclerosis. This thesis provides novel insights into the functions of STAT6 and STAT4 in atherosclerosis.
Efficient surface emitting AlGaAs/GaAs laser diodes based on first-order-grating-coupled surface mode emission
Creators: name: Golshani, A.
name: Hainberger, R.
name: Freisleben, S.
name: Kock, A.
name: Gornik, E.
name: Gmachl, C.
name: Korte, L.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1996
Subjects: ING-INF/01 Elettronica

description: Strongly improved surface emitting laser diodes based on surface mode emission (SME) are presented. For the first time an effective coupling mechanism utilizing first-order-grating excitation of surface modes is employed. This concept leads to an additional wavelength selection mechanism due to an efficient feedback effect, which can be used for single mode emission. A two-beam efficient surface emission with low divergency is achieved and the additional wavelength selection and feedback mechanism is demonstrated. The decisive advantage of the SME laser diodes in comparison to DFB/DBR laser diodes is their flexibility in fabrication, which makes them very suitable , for example, for wavelength division multiplexing (WDM) applications.
Buettikeria Sabatinelli & Pontuale 1998
Creators: name: Allsopp, Peter G.
name: Schoolmeesters, Paul
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Buettikeria

description: Buettikeria Sabatinelli & Pontuale, 1998a
[2 species].
Type species Buettikeria graingeri Sabatinelli & Pontuale, 1998, 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 135, DOI: 10.11646/megataxa.12.1.2, http://zenodo.org/record/14984437
Energy inequalities for cutoff functions and some applications
Creators: name: Andres, Sebastian
name: Barlow, Martin T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J35 (Primary) 60J25, 31C05, 31C25 (Secondary)

description: We consider a metric measure space with a local regular Dirichlet form. We establish necessary and sufficient conditions for upper heat kernel bounds with sub-diffusive space-time exponent to hold. This characterization is stable under rough isometries, that is it is preserved under bounded perturbations of the Dirichlet form. Further, we give a criterion for stochastic completeness in terms of a Sobolev inequality for cutoff functions. As an example we show that this criterion applies to an anomalous diffusion on a geodesically incomplete fractal space, where the well-established criterion in terms of volume growth fails.
Simulation-based optimal Bayesian experimental design for nonlinear systems
Creators: name: Huan, Xun
name: Marzouk, Youssef M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Machine Learning (stat.ML)
subject: Computation (stat.CO)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: The optimal selection of experimental conditions is essential to maximizing the value of data for inference and prediction, particularly in situations where experiments are time-consuming and expensive to conduct. We propose a general mathematical framework and an algorithmic approach for optimal experimental design with nonlinear simulation-based models; in particular, we focus on finding sets of experiments that provide the most information about targeted sets of parameters. Our framework employs a Bayesian statistical setting, which provides a foundation for inference from noisy, indirect, and incomplete data, and a natural mechanism for incorporating heterogeneous sources of information. An objective function is constructed from information theoretic measures, reflecting expected information gain from proposed combinations of experiments. Polynomial chaos approximations and a two-stage Monte Carlo sampling method are used to evaluate the expected information gain. Stochastic approximation algorithms are then used to make optimization feasible in computationally intensive and high-dimensional settings. These algorithms are demonstrated on model problems and on nonlinear parameter estimation problems arising in detailed combustion kinetics.
description: Preprint 53 pages, 17 figures (54 small figures). v1 submitted to the Journal of Computational Physics on August 4, 2011; v2 submitted on August 12, 2012. v2 changes: (a) addition of Appendix B and Figure 17 to address the bias in the expected utility estimator; (b) minor language edits; v3 submitted on November 30, 2012. v3 changes: minor edits
Le Feste delfiche (1927, 1930) di Angelos Sikelianos ed Eva
Palmer nelle fotografie del Museo Benaki di Atene
Creators: name: Zaccarini, Matteo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2010
Subjects: L-FIL-LET/02 Lingua e letteratura greca
L-LIN/20 Lingua e letteratura neogreca
L-ART/05 Discipline dello spettacolo
L-ANT/07 Archeologia classica

description: Studio tecnico e storico delle 'Feste delfiche' organizzate a Delfi nel 1927 e 1930 da A. Sikelianos e dalla moglie E. Palmer. Sulla base del lavoro di catalogazione del ricco materiale originale fotografico (qui pubblicato su autorizzazione del museo) e video conservato negli Archivi storici del Museo Benaki di Atene, curato in prima persona dall'autore, lo studio si propone di illustrare la genesi, l'articolazione e il significato culturale e artistico delle Feste.
‘THE MOST DIFFICULT CONVERSATIONS THAT WE HAVE’. THE DIFFICULTIES OF DISCHARGING HOSPICE PATIENTS TO CARE HOMES AT THE END OF LIFE: A QUALITATIVE FOCUS GROUP STUDY
Creators: name: Barclay, Stephen
name: Thomas, Tabitha
Publisher: name: Apollo - University of Cambridge Repository
Year: 2018

description: Background Discharge from in-patient palliative care units to long term care can be challenging. In the UK, hospice palliative care unit in-patients move to a care home if they no longer require specialist palliative care and cannot be discharged home. There is evidence from the UK and Australia to suggest that patients and families find the prospect of such a move distressing. Aim To investigate the experiences of hospice in-patient multidisciplinary teams concerning discharging patients from hospice to a care home for end of life care. Design A qualitative study, using thematic analysis to formulate themes from focus group discussions with hospice staff. Setting/Participants Five focus groups were conducted with staff at five UK hospices. Participants included multidisciplinary team members involved in discharge decisions. All groups had representation from a senior nurse and doctor at the hospice, with group size between three and eight participants. All but one group included physiotherapists, occupational therapists and family support workers. Results Two main themes emerged: practical concerns and dilemmas around decision making. The latter are reported in this paper. Dilemmas included; 1) Ethical concerns (dilemmas around the decision, lack of patient autonomy and allocation of resources); 2) Communication challenges and; 3) Discrepancies between the ideals and realities of hospice palliative care. Conclusions Hospice palliative care unit staff find discharging patients to care homes necessary, but often unsatisfactory for themselves and distressing for patients and relatives. Further research is needed to understand patients’ experiences concerning moving to care homes for end of life care, in order that interventions can be implemented to mitigate this distress.
Efficacia della fisioterapia per pazienti affetti da ernia discale: uno studio osservazionale
Creators: name: Giovagnoli, Alessandra
name: Marzialetti, Johnny
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2010
Subjects: SECS-S/01 Statistica
MED/01 Statistica medica
SECS-S/02 Statistica per la ricerca sperimentale e tecnologica

description: Fino ad alcuni anni fa, la lombosciatalgia dovuta a un’ernia discale radiologicamente comprovata era un’indicazione sicura per la rimozione chirurgica dell’ernia (discectomia), ma oggi non è più così e spesso i pazienti affetti da questo problema vengono indirizzati verso la riabilitazione fisioterapica. Ma la fisioterapia è veramente efficace? 
Mostriamo qui i risultati di uno studio prospettico osservazionale su un campione di pazienti sottoposti a fisioterapia in un centro medico specializzato di Bologna. Alcuni di questi pazienti avevano già subito una visita neurochirurgica e in taluni casi (che presentavano segni e sintomi più gravi degli altri, secondo gli indicatori clinici comunemente usati) avevano ricevuto l’indicazione di operarsi; però questi pazienti avevano deciso di non farlo, e di ricorrere invece a cure fisioterapiche. 
Come era da aspettarsi, il grado di miglioramento dei pazienti dipende da alcune caratteristiche specifiche, ma, sorprendentemente, non dal fatto che il paziente fosse o non fosse tra i “disobbedienti”. Questo risultato è confermato da un altro studio osservazionale su un piccolo campione di pazienti affetti da ernia discale visitati presso l’Ambulatorio Neurochirurgico dell’ospedale Bellaria di Bologna, alcuni dei quali sottoposti a discectomia.
Nella parte conclusiva dello studio si fanno alcune considerazioni generali e un’ipotesi su possibili diversità tra i pazienti ai quali viene consigliato l’intervento chirurgico ma non vi si sottopongono e gli altri. Questa congettura è stata l’oggetto di uno studio successivo.

Up to a few years ago, lower back pain and especially sciatica due to lumbar disc herniation (LDH) were indications for discectomy, whereas nowadays patients suffering from this predicament are often directed to rehabilitation by means of physiotherapy. But is physiotherapy effective? We show the results of an observational prospective study on a sample of LDH patients who underwent physiotherapy at a Bologna specialized medical centre. Prior to starting the therapy, some of the patients had been advised to resort to surgery, but had not complied, and indeed the patients with a surgical indication did present more serious signs and symptoms of LDH, according to the commonest clinical indicators. 
As expected, the degree of improvement appears to depend on some characteristics of the patient and his/her disease history, but, surprisingly, not on the patient being or not a non-complier. Our results are in line with the data of another small size observational study of ours, involving LDH patients who attended the out-patients Unit of the Bellaria hospital in Bologna, some of whom had surgery.