cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ballistic devices based on T-Branch Junctions and YBranch
Junctions on GaInAs/AlInAs heterostructures
Creators: name: Galloo, J.S.
name: Roelens, Y.
name: Bollaert, S.
name: Pichonat, E.
name: Wallart, X.
name: Cappy, A.
name: Mateos, J.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: We present processes for building passive and
active ballistic devices. A 2D Monte Carlo simulator was used
to optimize these devices. We present also the study of the
transition between ballistic and ohmic transport in T-Branch
Junctions (TBJs) at room temperature by using DC
characterization. Then we show experimental results for YBranch Junctions (YBJs) compared with Monte Carlo
Simulations.
A PSYCHOGENETIC ALGORITHM FOR BEHAVIORAL SEQUENCE LEARNING
Creators: name: Maniezzo, Vittorio
name: Roffilli, Matteo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: INF/01 Informatica

description: This work presents an original algorithmic model of some essential features of psychogenetic theory, as was proposed by J.Piaget. Specifically, we modeled some elements of cognitive structure learning in children from 0 to 4 months of life. We are in fact convinced that the study of well-established cognitive models of human learning can suggest new, interesting approaches to problem so far not satisfactorily solved in the field of machine learning. Further, we discussed the possible parallels between our model and subsymbolic machine learning and neuroscience. The model was implemented and tested in some simple experimental settings, with reference to the task of learning sensorimotor sequences.
Efimov Trimers near the Zero-crossing of a Feshbach Resonance
Creators: name: Zinner, N. T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Near a Feshbach resonance, the two-body scattering length can assume any value. When it approaches zero, the next-order term given by the effective range is known to diverge. We consider the question of whether this divergence (and the vanishing of the scattering length) is accompanied by an anomalous solution of the three-boson Schrödinger equation similar to the one found at infinite scattering length by Efimov. Within a simple zero-range model, we find no such solutions, and conclude that higher-order terms do not support Efimov physics.
description: 8 pages, no figures, final version
title: Labour Movements, Trade Unions and Strikes
title: Labour Movements, Trade Unions and Strikes
Creators: name: Thompson, James
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Weltkrieg [1914-1918]
subject: Arbeiterbewegung
subject: World War, 1914-1918
subject: Labor movement
subject: Strikes and lockouts

description: This article compares the history of labour movements during the war across a range of European countries. It charts the impact of the economic realities of the war upon labour and analyses the complex, and variable, relationship between labour parties, trade unions, and the state across different nations. The article traces and seeks to explain the chronology and character of strikes and protests in a number of national contexts. In doing so, it explores the ways in which the war period created a new model of revolutionary action and strengthened a reformist vision amongst labour activists.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
A balanced InGaP-GaAs Colpitt-VCO MMIC with
ultra-low phase noise
Creators: name: Zirath, Herbert
name: Kozhuharov, Rumen
name: Ferndahl, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: A balanced VCO-MMIC based on a
coupled Colpitt topology with a fully integrated tank is
presented. The design was focused on achieving
minimum phase noise by optimization of the tank-circuit
including the varactor, maximizing the tank-amplitude,
and designing the VCO for Class C operation. A
minimum phase noise of less than -112 dBc at an output
power of 5.5 dBm is achieved at 100 kHz carrier offset
and 6.4 GHz oscillation frequency. To our best
knowledge, this is the lowest reported phase noise to date
for a varactor based VCO with a fully integrated tank.
The MMIC was designed and fabricated in a commercial
InGaP-GaAs HBT foundry MMIC-process.
Parameter-dependent Pseudodifferential Operators of Toeplitz Type
Creators: name: Seiler, Jörg
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics

description: We present a calculus of pseudodifferential operators that contains both usual parameter-dependent operators -- where a real parameter τ enters as an additional covariable -- as well as operators not depending on τ. Parameter-ellipticity is characterized by the invertibility of three associated principal symbols. The homogeneous principal symbol is not smooth on the whole co-sphere bundle but only admits directional limits at the north-poles, encoded by a principal angular symbol. Furthermore there is a limit-family for τ\to+\infty. Ellipticity permits to construct parametrices that are inverses for large values of the parameter. We then obtain sub-calculi of Toeplitz type with a corresponding symbol structure. In particular, we discuss invertibility of operators of the form P_1A(τ)P_0 where both P_0 and P_1 are zero-order projections and A(τ) is a usual parameter-dependent operator of arbitrary order or A(τ)=τ^μ-A with a pseudodifferential operator A of positive integer order μ.
description: 22 pages; significant chances in the introduction and Section 4.2; Section 5 worked over
A K-Band Push-Push VCO MMIC using embedded
frequency doubling mechanism
Creators: name: Sim, Sang-Hoon
name: Ko, Sangsoo
name: Hong, Songcheol
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: A K-Band Push-Push VCO MMIC which has
small size, high output power and low phase noise is
presented. This push-push VCO utilize the embedded
frequency doubling mechanism of cross coupled topology. A
commercial InGaP/GaAs HBT technology with the f T of 60
GHz and the fMAX of 110 GHz was used for the
implementation. The oscillation frequency is from 21.02
GHz to 21.17 GHz. The peak output power of the VCO is
1.7dBm. The phase noise is -110dBc/Hz at 1MHz offset from
21.16 GHz. The chip size is 0.81 0.64 mm2.
Identification of a Strongly Nonlinear Device Compact Model
Based on Vectorial Large Signal Measurements
Creators: name: Camprini, M.
name: Cidronali, A.
name: Accillaro, C.
name: Magrini, I.
name: Loglio, G.
name: Collodi, G.
name: Jargon, J.
name: Manes, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: This paper deals with the identification of
equivalent circuit models for strongly nonlinear devices by
taking advantage of the so-called “Vectorial Large-Signal
Measurements”. A very specific device, the Heterojunction
Interband Tunneling FET (HITFET), has been selected as
case of study for its peculiar nonlinear behavior. A
comprehensive description of the identification is given
along with a number of experimental results. In
particular, the comparison between simulated and
measured data for different power levels and frequencies
from the set adopted during the identification confirms the
extrapolation capability of the approach.
DC and Low Frequency Noise Characteristics of SiGe
n-MODFET’s.
Creators: name: Rennane, A.
name: Bary, L.
name: Graffeuil, J.
name: Plana, R.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: This paper presents an investigation of the low
frequency noise properties of SiGe based n MODFET’s
through the characterization of both the gate current noise
and the drain current noise including their correlation.
Measurements versus bias and gate geometry have shown
that this noise is generated through mobility fluctuations or
carrier diffusion at the gate terminal and that carrier
number fluctuations are involved in drain current
fluctuations. Microwave residual phase noise measurements
have shown that the up-conversion effect mainly occurs on
the drain current noise.
Broadband   0.3-7 GHz  MESFET amplifier with low noise figure up to   fT/2 of the active device
Creators: name: Lott, U.
name: Baumberger, W.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: A broadband amplifier has been designed with a low noise figure up to 7 GHz using a standard 0.8 µm GaAs MESFET process (fT = 13 GHz). An active match common gate input stage, a common source output stage and a combination of resistive and reactive loads give a gain of 10 +/- 1 dB and a noise figure below 5 dB over the 0.3 to 7 GHz frequency range.
Adaptive multiple subtraction with wavelet-based complex unary Wiener filters
Creators: name: Ventosa, Sergi
name: Roy, Sylvain Le
name: Huard, Irène
name: Pica, Antonio
name: Rabeson, Hérald
name: Ricarte, Patrice
name: Duval, Laurent
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Adaptive subtraction is a key element in predictive multiple-suppression methods. It minimizes misalignments and amplitude differences between modeled and actual multiples, and thus reduces multiple contamination in the dataset after subtraction. Due to the high cross-correlation between their waveform, the main challenge resides in attenuating multiples without distorting primaries. As they overlap on a wide frequency range, we split this wide-band problem into a set of more tractable narrow-band filter designs, using a 1D complex wavelet frame. This decomposition enables a single-pass adaptive subtraction via complex, single-sample (unary) Wiener filters, consistently estimated on overlapping windows in a complex wavelet transformed domain. Each unary filter compensates amplitude differences within its frequency support, and can correct small and large misalignment errors through phase and integer delay corrections. This approach greatly simplifies the matching filter estimation and, despite its simplicity, narrows the gap between 1D and standard adaptive 2D methods on field data.
description: 18 pages, 10 color figures
Experimental extraction of equivalent scheme for dual gate field effect transistors
Creators: name: Langrez, D.
name: Duhamel, F.
name: Delos, E.
name: Salmer, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: The purpose of this paper is to describe a new method that we have developped to determine accurately all the elements of dual gate FET equivalent scheme. The parasitic and intrinsic elements are separately determined by biasing the DGFET in 'cold' and 'hot' regime. Some new results about 0.15 µm dual gate PM-HEMT, obtained from on-wafer three-ports S-parameters measurements in the 1.5-26.5 GHz range, are presented.
Connarus blanchetii Planch.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Oxalidales
Connaraceae
Connarus
Connarus blanchetii

description: 19. Connarus blanchetii Planch.
Brazil (Paraíba, Pernambuco, Bahia) (Forero 1983).
Selected Voucher:—Piedade, Araújo et al. 585 (UFP).
CONVOLVULACEAE
description: Published as part of Araújo, Diogo & Alves, Marccus, 2010, Climbing plants of a fragmented area of lowland Atlantic Forest, Igarassu, Pernambuco (northeastern Brazil), pp. 1-24 in Phytotaxa 8 on page 17, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
CAD-oriented modeling of the optically-controlled GaAs MESFET
Creators: name: Calandra, Enrico F.
name: Sirna, Guglielmo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: A CAD-oriented circuit model for the optically-controlled GaAs MESFET was developed on the basis of a dedicated characterization method. By exploiting separation of direct and indirect photo-induced effects, a simple but accurate modeling of both the static and microwave characteristics of the illuminated transistor was achieved. As demonstrated by the test circuits implemented, good agreement between measured and simulated performances can thus be obtained with limited device parameter identification effort.
Projections, plans and projects - development as the extension of organizing principles and its consequences in the rural Nuba Mountains, South Kordofan, Sudan (2005-2011)
Creators: name: Ille, Enrico
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2012
Subjects: subject: Online-Publikation
subject: Hochschulschrift
subject: 300

description: Diese Dissertation befasst sich mit den Bedingungen, unter denen soziale Interaktionen in Entwicklungsprojekten in ländlichen Gebieten der Nuba Mountains (Sudan) zwischen 2005 und 2011 stattfanden. Die Studie untersucht dabei vor allem die Bedingungen struktureller Instabilität in der Region, welche sich auch in vorgeblich technisch definierten Prozessen der Planung und Implementierung widerspiegeln. Die Konzepte ‚Problematisierung‘, ‚Übersetzung‘ und ‚organisierende Prinzipien‘ wurden dabei verwendet um die komplexe Beziehung zwischen politischen und technischen Problematiken fassbar zu machen. Die Analyse basiert auf Ergebnissen von insgesamt 12 Monaten Feldforschung (teilnehmende Beobachtung, narrative Interviews) an verschiedenen Orten im Sudan (Khartoum, Kadugli, Heiban, Abol, Kubang). Neben einschlägigen Regionalstudien wurden als schriftliche Quellen historische Dokumente (Briefe, kolonialadministrative Berichte) des Sudan-Archivs in Durham, jüngste Regierungsdokumente, sowie Dokumente von nationalen und internationalen Entwicklungsorganisationen einbezogen.
description: This thesis discusses the conditions of social interaction in development projects in the rural Nuba Mountains (Sudan) between 2005 and 2011. Above all, the study examines conditions of structural instability in the region, which are also reflected in processes of planning and implementation supposedly technical in nature. The concepts ‘problematization’, ‘translation’ and ‘organizing principles’ are used in order to grasp the complex relation between political and technical problems. The analysis is based on the results of overall 12 months of fieldwork (participant observation, narrative interviews) at different places in the Sudan (Khartoum, Kadugli, Heiban, Abol, Kubang). Beside relevant regional studies, the written sources included historical documents (letters, reports of the colonial administration) from the Sudan Archive in Durham, recent governmental documents, as well as documents of national and international development organizations.
Distributional convergence for the number of symbol comparisons used by QuickSort
Creators: name: Fill, James Allen
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Most previous studies of the sorting algorithm QuickSort have used the number of key comparisons as a measure of the cost of executing the algorithm. Here we suppose that the n independent and identically distributed (i.i.d.) keys are each represented as a sequence of symbols from a probabilistic source and that QuickSort operates on individual symbols, and we measure the execution cost as the number of symbol comparisons. Assuming only a mild "tameness" condition on the source, we show that there is a limiting distribution for the number of symbol comparisons after normalization: first centering by the mean and then dividing by n. Additionally, under a condition that grows more restrictive as p increases, we have convergence of moments of orders p and smaller. In particular, we have convergence in distribution and convergence of moments of every order whenever the source is memoryless, that is, whenever each key is generated as an infinite string of i.i.d. symbols. This is somewhat surprising; even for the classical model that each key is an i.i.d. string of unbiased ("fair") bits, the mean exhibits periodic fluctuations of order n.
description: Published in at http://dx.doi.org/10.1214/12-AAP866 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Stability in orbit equivalence for Baumslag-Solitar groups and Vaes groups
Creators: name: Kida, Yoshikata
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: Dynamical Systems (math.DS)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 20E06, 20E08, 37A20

description: A measure-preserving action of a discrete countable group on a standard probability space is called stable if the associated equivalence relation is isomorphic to its direct product with the ergodic hyperfinite equivalence relation of type II_1. We show that any Baumslag-Solitar group has such an ergodic, free and stable action. It follows that any Baumslag-Solitar group is measure equivalent to its direct product with any amenable group. The same property is obtained for the inner amenable groups of Vaes.
description: 23 pages, references added and updated (v2), minor changes (v3)
A look-up table empirical model for the nonlinear dynamic performance prediction of microwave transistors
Creators: name: Filicori, F.
name: Vannini, G.
name: Monaco, V.A.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: This paper describes a mathematical model which has been adopted for the large-signal performance prediction of electron devices in the framework of Harmonic-Balance tools for circuit analysis. The model, which is technology independent, is based on look-up tables storing small-signal bias/frequency-dependent AC parameters and DC characteristics obtained by means of conventional automated measurement equipment. The large-signal dynamic device response is predicted, directly from the measured data, through a Nonlinear Integral expression. In the paper special attention will be given to practical aspects (e.g., accuracy limitations, numerical interpolation techniques, etc..,.). Experimental and simulated results which confirm the validity of the proposed modelling approach are also presented.
A framework for integrated design of algorithmic architectural forms
Creators: name: Svoboda, Ladislav
name: Novák, Jan
name: Kurilla, Lukáš
name: Zeman, Jan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: This paper presents a methodology and software tools for parametric design of complex architectural objects, called digital or algorithmic forms. In order to provide a flexible tool, the proposed design philosophy involves two open source utilities Donkey and MIDAS written in Grasshopper algorithm editor and C++, respectively, that are to be linked with a scripting-based architectural modellers Rhinoceros, IntelliCAD and the open source Finite Element solver OOFEM. The emphasis is put on the mechanical response in order to provide architects with a consistent learning framework and an insight into structural behaviour of designed objects. As demonstrated on three case studies, the proposed modular solution is capable of handling objects of considerable structural complexity, thereby accelerating the process of finding procedural design parameters from orders of weeks to days or hours.
description: 22 pages, 15 figures, v2: Substantially revised after the first review
Untersuchungen zur Jasmonat-Signaltransduktion in Arabidopsis thaliana anhand des Jasmonat-regulierten Gens Atjrg21
Creators: name: Bau, Stephan
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2001
Subjects: Elektronische Publikation
Hochschulschrift
Zsfassung in engl. Sprache

description: Die Jasmonsäure und ihre Derivate, die Jasmonate, sind pflanzliche Wachstumsregulatoren. In der Modellpflanze Arabidopsis thaliana sind sie an Prozessen wir der Pollenreifung, Wundantwort und Pathogenabwehr beteiligt. Ihre Funktion besteht in der Regulation spezifischer Gene. Zu solchen Genen gehört das Jasmonat-regulierte Gen Atjrg21. Die cDNA dieses Gens wurde im Vorfeld dieser Arbeit isoliert und sollte als Marker und Werkzeug für molekulare Studien über Jasmonat-regulierte Signaltransduktionsprozesse dienen. Die Funktion des Atjrg21 ist unbekannt, jedoch sind große Mengen an Atjrg21-Transkript nach der Behandlung mit Methyljasmonat, der Verwundung der Pflanze oder der Infektion mit dem Pflanzenpathogen Fusarium oxysporum nachweisbar. Genomische Sequenzen des Atjrg21-Gens wurden zur Generierung transgener Pflanzen mit Jasmonat-induzierbaren Reportergenen genutzt. Hierbei zeigte sich, dass Intron-Bereiche essentiell für die Induktion des Atjrg21 durch Methyljasmonat und andere Stressoren sind. Zwei G-Box-Motive (CACGTG) im zweiten Intron konnten mithilfe von Mutageneseexperimenten als Regulationselemente identifiziert werden. Weiterhin wurden transgene Pflanzen mit einem Jasmonat-responsiven, konditional letalen Selektionsmarker genutzt, um Jasmonat-Signaltransduktionsmutanten zu selektieren. Mithilfe dieser Pflanzen konnten in einer mutagenisierten Population putative, Jasmonat-insensitive Mutanten isoliert werden, welche in nachfolgenden Northern-Blot-Analysen eine verminderte Akkumulation der Atjrg21-mRNA nach Applikation von Methyljasmonat zeigten.
description: Jasmonic acid and its derivatives are plant growth regulators. In Arabidopsis thaliana jasmonates are involved in processes like pollen development, wound response and pathogen defence. To obtain molecular probes for studying jasmonate signalling we screened in our previous work for jasmonate-inducible genes. Here we isolated a cDNA of the jasmonate-regulated gene Atjrg21. The function of Atjrg21 is still unknown, but Northern blot analysis show that the Atjrg21 is induced by methyl jasmonate treatment, wounding and the plant pathogen Fusarium oxysporum. We used genomic sequences of Atjrg21 to generate transgenic plants with jasmonate-inducible reporter genes. In these experiments we observed that intron sequences are essential for the regulation of Atjrg21. Two potential G-boxes were found within the second intron, which were subsequently altered by site directed mutagenesis. This mutagenesis led to the loss of jasmonate inducibility and showed that gene activation by jasmonate is dependent on these two boxes. Furthermore, we used transgenic plants with a jasmonate-inducible conditional lethal marker gene to screen for jasmonate-insensitive mutants. In a mutagenised population we were able to select putative mutants with altered gene expression of Atjrg21.
Synthesis of cellulosic glycolipids using engineered enzymes
Creators: name: Chambers, Martina Natasha
Publisher: name: University of British Columbia
Year: 2014

description: Cellulose, a linear polymer of D-glucose units connected by β-1,4 glycosidic bonds, adopts a highly-ordered crystalline structure in solution. In cellulose I, the dominant form of cellulose in nature, the polymeric chains are aligned in the same direction. Previous attempts to synthesize cellulose I in vitro have resulted in the synthesis of cellulose II, which has the thermodynamically favored anti-parallel orientation of chains. The synthesis of soluble fragments or defined surfaces of cellulose I would enable more detailed study of carbohydrate binding domains and other proteins that interact with cellulose in nature. The objective of this thesis is to prepare a crystalline surface of cellulose I in a controlled manner through the alignment of cellulolipids. A major focus of this thesis is the synthesis of cellulolipids with a cellohexaosyl head group. Cellohexaose is the shortest cello-oligosaccharide with cellulosic properties, but is consequently insoluble in aqueous solution. To improve the solubility of cellohexaose, the addition of a removable charged functionality was explored: either a terminal sialic acid or a phosphate group at the 6 position of the non-reducing terminal glucose. Abg2F6 glycosynthase from Agrobacterium sp. was used to synthesize β-1,4 linked cello-oligosaccharide fluorides from DP = 2 to DP = 4. These cello-oligosaccharides were modified with a removable charged functionality and utilized as donor substrates by CelB glycosynthase, a mutant of a β-1,4 endoglucanase from Caldicellulosiruptor saccharolyticus. Through the combination of glycosynthase enzymes and charged functionalities, a variety of soluble cellohexaosyl analogs were synthesized. Lyso-glycosphingolipids were prepared by transferring cello-oligosaccharyl fluorides to D-erythro-C18-sphingosine using EGCase glycosynthase. CelB glycosynthase used charged glycosyl fluoride donors to extend the lyso-glycosphingolipids, yielding soluble cellulolipids. The soluble cellulolipids were aligned along an aqueous:organic interface and the charged functionality was removed. Thus, a surface was prepared that appeared to interact with a carbohydrate binding module functionalized with a fluorescent tag. The soluble cellulolipids were successfully incorporated into a nanodisc, as shown through the incorporation of phosphorylated cellohexaosyl sphingosine. Cleavage of the phosphate using alkaline phosphatase yielded a nanodisc containing cellulolipids.
The Structure of the Interstellar Medium of Star Forming Galaxies
Creators: name: Hopkins, Philip F.
name: Quataert, Eliot
name: Murray, Norman
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present numerical methods for including stellar feedback in galaxy-scale simulations. We include heating by SNe (I & II), gas recycling and shock-heating from O-star & AGB winds, HII photoionization, and radiation pressure from stellar photons. The energetics and time-dependence are taken directly from stellar evolution models. We implement these in simulations with pc-scale resolution, modeling galaxies from SMC-like dwarfs and MW analogues to massive z~2 starburst disks. Absent feedback, gas cools and collapses without limit. With feedback, the ISM reaches a multi-phase steady state in which GMCs continuously form, disperse, and re-form. Our primary results include: (1) Star forming galaxies generically self-regulate at Toomre Q~1. Most of the volume is in diffuse hot gas with most of the mass in dense GMC complexes. The phase structure and gas mass at high densities are much more sensitive probes of stellar feedback physics than integrated quantities (Toomre Q or gas velocity dispersion). (2) Different feedback mechanisms act on different scales: radiation & HII pressure are critical to prevent runaway collapse of dense gas in GMCs. SNe and stellar winds dominate the dynamics of volume-filling hot gas; however this primarily vents out of the disk. (3) The galaxy-averaged SFR is determined by feedback. For given feedback efficiency, restricting star formation to molecular gas or modifying the cooling function has little effect; but changing feedback mechanisms directly translates to shifts off the Kennicutt-Schmidt relation. (4) Self-gravity leads to marginally-bound GMCs with an ~M^-2 mass function with a cutoff at the Jeans mass; they live a few dynamical times before being disrupted by stellar feedback and turn ~1-10% of their mass into stars (increasing from dwarfs through starburst galaxies). Low-mass GMCs are preferentially unbound.
description: 34 pages, 24 figures, accepted to MNRAS (matches accepted version). Movies of the simulations are available at https://www.cfa.harvard.edu/~phopkins/Site/Movies_sbw.html
A large-scale, self-consistent thermal simulator for the layout optimization of power III-V field-effect and bipolar transistors
Creators: name: Bonani, F.
name: Ghione, G.
name: Pirola, M.
name: Naldi, C. U.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: The paper describes the application of a 3D large-scale thermal simulation tool to the layout analysis and optimization of power III-V devices. A short description is provided of the hybrid algorithm (Green's function and finite-element) exploited by the simulator. The model accounts for non-linear multilayered substrates, heat conduction through surface metallizations and via holes, and substrate thinnings. Case studies are discussed to demonstrate the effectiveness of the approach in investigating the thermal behaviour of different device layouts.
Phenomena description of pulsed characterization of GaAs-MESFET transistors for non-linear modelling purposes
Creators: name: Mediavilla, A.
name: Tazón, A.
name: Garcia, J.L.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: This paper presents a study of the different phenomena that define the large signal behaviour of the GaAs-MESFET as trapping effects and operating point dependence (real heating). These phenomena have been included in a CAD-oriented circuital model. The pulsed measurements have been made maintaining the transistor at each quiescent operating point for several seconds in order to make the operation temperature constant. Considering the effects described before, a CAD oriented large signal MESFET model capable of simulating DC, pulsed, RF and the I/V characteristic variations with the operating point has been developed. The Ids current is modelled by two non-linear sources, one of them is a bias point dependent nonlinear equation and the other one represents the differences between DC and Pulsed characteristics at every bias point. Experimental pulsed characteristics and simulations, for a 10*140 µm chip transistor from GEC-Marconi foundry, have been carried out, showing excellent agreement. Furthermore, a complete model of this transistor has been obtained. Successful comparisons between MDS simulations using the extracted model and experimental Scattering and power measurements (loaded by 50 Ohms at the input and output ports) have been done. Also, this method has been used to model a 6000 µm chip transistor from PML foundry showing a very good agreement.
Block thresholding for wavelet-based estimation of function derivatives from a heteroscedastic multichannel convolution model
Creators: name: Navarro, Fabien
name: Chesneau, Christophe
name: Fadili, Jalal
name: Sassi, Taoufik
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We observe $n$ heteroscedastic stochastic processes $\{Y_v(t)\}_{v}$, where for any $v\in\{1,\ldots,n\}$ and $t \in [0,1]$, $Y_v(t)$ is the convolution product of an unknown function $f$ and a known blurring function $g_v$ corrupted by Gaussian noise. Under an ordinary smoothness assumption on $g_1,\ldots,g_n$, our goal is to estimate the $d$-th derivatives (in weak sense) of $f$ from the observations. We propose an adaptive estimator based on wavelet block thresholding, namely the "BlockJS estimator". Taking the mean integrated squared error (MISE), our main theoretical result investigates the minimax rates over Besov smoothness spaces, and shows that our block estimator can achieve the optimal minimax rate, or is at least nearly-minimax in the least favorable situation. We also report a comprehensive suite of numerical simulations to support our theoretical findings. The practical performance of our block estimator compares very favorably to existing methods of the literature on a large set of test functions.
Bonamia maripoides Hallier
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Solanales
Convolvulaceae
Bonamia
Bonamia maripoides

description: 20. Bonamia maripoides Hallier f.
Panama, Venezuela, Suriname, Brazil (Pernambuco, Bahia).
Selected Voucher:—Zambana, Albuquerque 493 (IPA, ULM).
description: Published as part of Araújo, Diogo & Alves, Marccus, 2010, Climbing plants of a fragmented area of lowland Atlantic Forest, Igarassu, Pernambuco (northeastern Brazil), pp. 1-24 in Phytotaxa 8 on page 17, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
Stellar Feedback in Galaxies and the Origin of Galaxy-scale Winds
Creators: name: Hopkins, Philip F.
name: Quataert, Eliot
name: Murray, Norman
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Feedback from massive stars is believed to play a critical role in driving galactic super-winds that enrich the IGM and shape the galaxy mass function and mass-metallicity relation. In previous papers, we introduced new numerical methods for implementing stellar feedback on sub-GMC through galactic scales in galaxy simulations. This includes radiation pressure (UV through IR), SNe (Type-I & II), stellar winds ('fast' O-star through 'slow' AGB winds), and HII photoionization. Here, we show that these feedback mechanisms drive galactic winds with outflow rates as high as ~10-20 times the galaxy SFR. The mass-loading efficiency (wind mass loss rate divided by SFR) scales inversely with circular velocity, consistent with momentum-conservation expectations. We study the contributions of each feedback mechanism to galactic winds in a range of galaxy models, from SMC-like dwarfs & MW-analogues to z~2 clumpy disks. In massive, gas-rich systems (local starbursts and high-z galaxies), radiation pressure dominates the wind generation. For MW-like spirals and dwarf galaxies the gas densities are much lower, and shock-heated gas from SNe and stellar winds dominates production of large-scale outflows. In all models, however, winds have a multi-phase structure that depends on interactions between multiple feedback mechanisms operating on different spatial & time scales: any single mechanism fails to reproduce the winds observed. We provide fitting functions for wind mass-loading and velocities as a function of galaxy properties, for use in cosmological simulations and semi-analytic models. These differ from typically-adopted formulae with explicit dependence on gas surface density that can be very important in both low-density dwarf galaxies and high-density gas-rich galaxies.
description: 16 pages, 11 figures, accepted to MNRAS (matches accepted version). Movies of the simulations are available at https://www.cfa.harvard.edu/~phopkins/Site/Movies_sbw.html
A large-signal model for GaAs MESFET's and HEMT's valid at multiple DC bias-points
Creators: name: Cojocaru, Vicentiu I.
name: Brazil, Thomas J.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: In this paper we present a general-purpose GaAs FET nonlinear circuit model, for universal use (DC, small-signal and large-signal) which is valid at multiple DC operating points. Novel features of the model include: (i) a direct and reliable multi-bias point parameter extraction methodology (no optimisation required), based solely on CW S-parameter measurements, with an improved approach to the extraction of the parasitic resistances; (ii) more accurate models for the main non-linearities, with special attention paid to the gate capacitances, the intrinsic resistance and high-frequency dispersion in the drain circuit. The validity of the model is demonstrated through extensive power-sweep tests, carried out at different DC bias-points and different frequencies.
Ipomoea bahiensis Roem. & Schult.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Solanales
Convolvulaceae
Ipomoea
Ipomoea bahiensis

description: 21. Ipomoea bahiensis Willd. ex Roem. & Schult.
Brazil (widely distributed) (Simão-Biachini 1993).
Selected Voucher:—Pezinho, Alves-Araújo et al. 229 (UFP); Zambana, Alves-Araújo et al. 651 (UFP).
description: Published as part of Araújo, Diogo & Alves, Marccus, 2010, Climbing plants of a fragmented area of lowland Atlantic Forest, Igarassu, Pernambuco (northeastern Brazil), pp. 1-24 in Phytotaxa 8 on page 17, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
An improved P-HEMT large-signal model for medium-power Ka-band amplifiers
Creators: name: Pirola, M.
name: Ghione, G.
name: Dortu, J. M.
name: Muller, J.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1994
Subjects: ING-INF/01 Elettronica

description: A large-signal lumped-parameter model for pseudomorphic HEMT devices (P-HEMTs) is described. The model was implemented in the HARPE/OSA environment on the basis of the Angelov approach and further developed through comparison with three generations of SIEMENS P-HEMTs; an MDS version is also available. The final model shows very good agreement with experimental data for the DC and small-signal parameters on a wide range of bias points; preliminary comparisons carried out on large-signal measurements are also satisfactory.
On "Novel attractive forces" between ions in quantum plasmas -- failure of linearized quantum hydrodynamics
Creators: name: Bonitz, M.
name: Pehlke, E.
name: Schoof, T.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In a recent letter [P.K. Shukla and B. Eliasson, Phys. Rev. Lett. 108, 165007 (2012)] the discovery of a new attractive force between protons in a hydrogen plasma was reported that would be responsible for the formation of molecules and of a proton lattice. Here we show, based on ab initio density functional theory calculations, that these predictions are wrong and caused by using linearized quantum hydrodynamics beyond the limits of its applicability.
description: accepted for publication in Phys. Rev. E
Ipomoea hederifolia
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Solanales
Convolvulaceae
Ipomoea
Ipomoea hederifolia

description: 22. Ipomoea hederifolia L.
Tropical America (widely distributed) (Simão-Biachini 1993).
Selected Voucher:—Zambana, Albuquerque 542 (IPA, ULM); Pezinho, Alves-Araújo et al. 603 (UFP).
description: Published as part of Araújo, Diogo & Alves, Marccus, 2010, Climbing plants of a fragmented area of lowland Atlantic Forest, Igarassu, Pernambuco (northeastern Brazil), pp. 1-24 in Phytotaxa 8 on page 17, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
Micromachining in Terahertz technology
Creators: name: Mann, C.M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Terahertz waveguide components incorporating integrated RF circuits have now been realised with state of the art performance to 2.5THz. Presently such technology is limited to specialist applications such as remote sensing and radio astronomy. There are many other potential applications for this frequency region but the associated cost of the hardware is restricting its use. Fortunately, the size and geometry of waveguide at terahertz frequencies ideally lends itself to fabrication via a number of micromachining techniques promising to dramatically reduce its cost. In addition, the use of micromachining allows the realisation of waveguide components that otherwise could not be fabricated via conventional machining at these frequencies. Excellent RF performance is now being obtained with fully micromachined terahertz components. This paper describes some of the techniques presently being developed and implemented in this exciting new area of RF technology.
Semi and super-conducting technologies for the millimeter and submillimetre wave applications
Creators: name: Beaudin, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Millimeter and submillimeter-wave observations provide important informations for the studies of atmospheric chemistry and of astrochemistry (molecular clouds, stars formation, galactic study, comets and cosmology). But, these observations depend strongly on instrumentation techniques and on the site quality. New techniques or higher detector performances result in unprecedented observations and sometimes, the observational needs drive developments of new detector technologies, for example, superconducting junctions (SIS mixers) because its high sensitivity in heterodyne detection in the millimeter and submillimeter wave range (100 GHz - 700 GHz), HEB (Hot Electron Bolometer) mixers which are being developed by several groups for application in THz observations. For the sub-millimetre wavelengths heterodyne receivers, the local oscillator (LO) is still a critical element. So far, solid state fundamental sources are not often powerful enough for most of the applications at millimetre or sub-millimetre waveleng  : large efforts using new planar components (HBV) and integrated circuits or new technics (laser mixing) are now in progress in few groups. The new large projects as SOFIA, ISS, FIRST, ALMA,…for astronomy ; SMILES, EOS-MLS,…for aeronomy and other projects for the planetary science, will profit of the new technologies.
A 3V small chip size GSM HBT power MMIC with 56% PAE
Creators: name: Mueller, J.-E.
name: Gerlach, U.
name: Madonna, G.L.
name: Pfost, M.
name: Schultheis, R.
name: Zwicknagl, P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A three stage 56% power added efficiency (PAE) InGaP/GaAs HBT power MMIC for use in GSM applications (900MHz) is described. An output power of 2.7W is obtained at the connectors of the evaluation board with a single supply voltage of 3.2V. The large signal gain is in excess of 32dB and the dynamic range for power control exceeds 80 dB. The chip size of only 2mm² allows housing in a tiny plastic package (TSSOP10) which occupies less than one half of the board area compared to packaged GSM devices before. For circuit design an accurate electrothermal large-signal HBT model is used. For characterisation of large emitter area power transistors on-wafer large signal measurement techniques have been developed which assist model verification and provide new insights in the influence of harmonic load terminations. The design techniques employs two steps. In a first step on-wafer loadpull measurements provide reasonable conditions for output power, which are combined with appropriate small-signal simulations to fix th  circuit topology in principal. In a second step refinements of the power performance are achieved by large-signal simulations.
Long-time asymptotics of the long-range Emch-Radin model
Creators: name: Kastner, Michael
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The long-time asymptotic behavior is studied for a long-range variant of the Emch-Radin model of interacting spins. We derive upper and lower bounds on the expectation values of a class of observables. We prove analytically that the time scale at which the system relaxes to equilibrium diverges with the system size N, displaying quasistationary nonequilibrium behavior. This finding implies that, for large enough N, equilibration will not be observed in an experiment of finite duration.
description: 12 pages, 2 figures. Compared to the published version, a 1/2 has been corrected in Eq. (9) and subsequent equations; the modifications are insubstantial and leave the main results of the article unaltered. arXiv admin note: substantial text overlap with arXiv:1103.0836
Ipomoea martii Meisner
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Solanales
Convolvulaceae
Ipomoea
Ipomoea martii

description: 23. Ipomoea martii Meisner in Mart.
Brazil (Pernambuco, Goiás, São Paulo).
Selected Voucher:—Piedade, Melo et al. 296 (UFP).
description: Published as part of Araújo, Diogo & Alves, Marccus, 2010, Climbing plants of a fragmented area of lowland Atlantic Forest, Igarassu, Pernambuco (northeastern Brazil), pp. 1-24 in Phytotaxa 8 on page 17, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
Design techniques for linear requirements for MMIC power amplifiers
Creators: name: Emanuelsson, Thomas
name: Thöresson, Stefan
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Measurements and simulations on MESFET’s and GaAs HBT’s shows that intermodulation suppression and efficiency can be greatly improved by applying the correct loads not only to the fundamental but also to at least the first two harmonics and the low frequency mixing term. At 40 dBc IM3 the efficiency for the MESFET is increased from 20 to 30 % and in the case of the GaAs HBT the improvement is from 10 to 17 %.
Computation of frequency responses for linear time-invariant PDEs on a compact interval
Creators: name: Lieu, Binh K.
name: Jovanović, Mihailo R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Analysis of PDEs (math.AP)
subject: Optimization and Control (math.OC)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We develop mathematical framework and computational tools for calculating frequency responses of linear time-invariant PDEs in which an independent spatial variable belongs to a compact interval. In conventional studies this computation is done numerically using spatial discretization of differential operators in the evolution equation. In this paper, we introduce an alternative method that avoids the need for finite-dimensional approximation of the underlying operators in the evolution model. This method recasts the frequency response operator as a two point boundary value problem and uses state-of-the-art automatic spectral collocation techniques for solving integral representations of the resulting boundary value problems with accuracy comparable to machine precision. Our approach has two advantages over currently available schemes: first, it avoids numerical instabilities encountered in systems with differential operators of high order and, second, it alleviates difficulty in implementing boundary conditions. We provide examples from Newtonian and viscoelastic fluid dynamics to illustrate utility of the proposed method.
description: Submitted to J. Comput. Phys.; 31 pages, 11 figures
Small sized high-gain PHEMT high-power amplifiers for X-BAND applications
Creators: name: De Hek, A.P.
name: Hunneman, P.A.H.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: The development of two small sized broadband X-band high-power amplifiers is discussed. The amplifiers are realised with the help of the pseudomorphic HEMT technology of the Fraunhofer Institute for Applied Solid State Physics (FhG-IAF). With the help of this technology the feasibility of integrating a driver and high-power amplifier on a single, small sized, chip is demonstrated. This integration will reduce the number of chips necessary in a Transmit/Receive (T/R) module used in e.g. a phased-array radar antenna. Consequently, the cost of a T/R module is reduced.