cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Magnetic-field induced multiferroicity in a quantum critical frustrated spin liquid
Creators: name: Schrettle, F.
name: Krohns, S.
name: Lunkenheimer, P.
name: Loidl, A.
name: Wulf, E.
name: Yankova, T.
name: Zheludev, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Dielectric spectroscopy is used to check for the onset of polar order in the quasi one-dimensional quantum spin system Sul-Cu2Cl4 when passing from the spin-liquid state into the ordered spiral phase in an external magnetic field. We find clear evidence for multiferroicity in this material and treat in detail its H-T phase diagram close to the quantum-critical regime.
description: 5 pages, 4 figures. Revised according to suggestions of referees
Explicit approximate controllability of the Schrödinger equation with a polarizability term
Creators: name: Morancey, Morgan
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optimization and Control (math.OC)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider a controlled Schrödinger equation with a dipolar and a polarizability term, used when the dipolar approximation is not valid. The control is the amplitude of the external electric field, it acts non linearly on the state. We extend in this infinite dimensional framework previous techniques used by Coron, Grigoriu, Lefter and Turinici for stabilization in finite dimension. We consider a highly oscillating control and prove the semi-global weak $H^2$ stabilization of the averaged system using a Lyapunov function introduced by Nersesyan. Then it is proved that the solutions of the Schrödinger equation and of the averaged equation stay close on every finite time horizon provided that the control is oscillating enough. Combining these two results, we get approximate controllability to the ground state for the polarizability system.
Spectrum market intervention and the mobile telecommunications market
Creators: name: Bouchette, Brenda Janet
Publisher: name: University of British Columbia
Year: 2014

description: This thesis investigates the effects of public policy intervention in the market for commercial mobile spectrum. Spectrum is a key input in the provision of commercial mobile telecommunications services (i.e. cellular mobile phone service). In particular, the investigation centres on the regulatory framework of spectrum auctions that introduces set-aside spectrum or otherwise artificially discounted spectrum for entrant companies, for the purpose of increasing competition in the market for mobile telephony services. This investigation is based on the development of a market model for the commercial mobile telephony market, using spectrum as an input. Suppliers, both incumbent and entrant, maximize profits by first choosing the amount of spectrum to purchase and then choosing the level of services afforded by the spectrum they own. We examine the results of the model in scenarios with both non-discounted and discounted spectrum for entrants. We conclude that the successful introduction of entrants will result a lower equilibrium price, but that the extent of this price reduction is heavily dependent on the price elasticity of market demand. If entry is encouraged through discounted spectrum, then investment levels may be reduced in the long term.
Serjania salzmanniana Schltdl.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Sapindales
Sapindaceae
Serjania
Serjania salzmanniana

description: 86. Serjania salzmanniana Schltdl.
Brazil (from Paraíba to Rio de Janeiro).
Selected Voucher:—Zambana, Araújo 554 (UFP); Piedade, Araújo & Alves-Araújo 523 (UFP); Macacos, Araújo et al. 490 (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 21, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
Moduli spaces of algebras over non-symmetric operads
Creators: name: Muro, Fernando
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Topology (math.AT)
subject: Algebraic Geometry (math.AG)
subject: Category Theory (math.CT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 18D50, 55U35, 14K10

description: In this paper we study spaces of algebras over an operad (non-symmetric) in symmetric monoidal model categories. We first compute the homotopy fiber of the forgetful functor sending an algebra to its underlying object, extending a result of Rezk. We then apply this computation to the construction of geometric moduli stacks of algebras over an operad in a homotopical algebraic geometry context in the sense of Toën and Vezzosi. We show under mild hypotheses that the moduli stack of unital associative algebras is a Zariski open substack of the moduli stack of non-necessarily unital associative algebras. The classical analogue for finite-dimensional vector spaces was noticed by Gabriel.
description: 38 pages. Many improvements and generalizations with respect to the previous version
Accelerating Atomic Orbital-based Electronic Structure Calculation via Pole Expansion and Selected Inversion
Creators: name: Lin, Lin
name: Chen, Mohan
name: Yang, Chao
name: He, Lixin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We describe how to apply the recently developed pole expansion and selected inversion (PEXSI) technique to Kohn-Sham density function theory (DFT) electronic structure calculations that are based on atomic orbital discretization. We give analytic expressions for evaluating the charge density, the total energy, the Helmholtz free energy and the atomic forces (including both the Hellman-Feynman force and the Pulay force) without using the eigenvalues and eigenvectors of the Kohn-Sham Hamiltonian. We also show how to update the chemical potential without using Kohn-Sham eigenvalues. The advantage of using PEXSI is that it has a much lower computational complexity than that associated with the matrix diagonalization procedure. We demonstrate the performance gain by comparing the timing of PEXSI with that of diagonalization on insulating and metallic nanotubes. For these quasi-1D systems, the complexity of PEXSI is linear with respect to the number of atoms. This linear scaling can be observed in our computational experiments when the number of atoms in a nanotube is larger than a few hundreds. Both the wall clock time and the memory requirement of PEXSI is modest. This makes it even possible to perform Kohn-Sham DFT calculations for 10,000-atom nanotubes with a sequential implementation of the selected inversion algorithm. We also perform an accurate geometry optimization calculation on a truncated (8,0) boron-nitride nanotube system containing 1024 atoms. Numerical results indicate that the use of PEXSI does not lead to loss of accuracy required in a practical DFT calculation.
Induced quasi-cocycles on groups with hyperbolically embedded subgroups
Creators: name: Hull, M.
name: Osin, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: Let G be a group, H a hyperbolically embedded subgroup of G, V a normed G-module, U an H-invariant submodule of V. We propose a general construction which allows to extend 1-quasi-cocycles on H with values in U to 1-quasi-cocycles on G with values in V. As an application, we show that every group G with a non-degenerate hyperbolically embedded subgroup has dim H^2_b (G, l^p(G))=\infty for p\in [1, \infty). This covers many previously known results in a uniform way. Applying our extension to quasimorphisms and using Bavard duality, we also show that hyperbolically embedded subgroups are undistorted with respect to the stable commutator length.
description: 27 pages, 6 figures
title: Powder Aerosol Deposition as a Method to ProduceGarnet-Type Solid Ceramic Electrolytes : A Study on Electrochemical Film Properties and Industrial Applications
Creators: name: Nazarenus, Tobias
name: Sun, Yanyan
name: Exner, Jörg
name: Kita, Jaroslaw
name: Moos, Ralf
Publisher: name: University of Bayreuth
Year: 2021
Subjects: subject: cycle stabilities
subject: industrial applications
subject: lithium metal electrodes
subject: Li₇La₃Zr₂O₁₂ powder aerosol deposition method
subject: 620

description: Cyclable lithium batteries with a lithium metal anode are of great interest for future mobile and stationary applications due to their high potential energy density. To suppress lithium dendrite formation and growth, solid electrolytes (all-solid-state-batteries) are an alternative for liquid electrolytes. Compared with all other solid electrolytes, the ceramic lithium garnet solid electrolyte Li7La3Zr2O12 (LLZO) features a high thermal, electrochemical, and chemical stability. Due to its nonflammable nature, it is beneficial for battery cell safety. Despite major research efforts, an industrially applicable process route to produce the ceramic solid electrolyte has not been identified yet. Herein, film fabrication at room temperature of Al0.2Li6.025La3Zr1.625Ta0.375O12 (ALLZTO) via powder aerosol deposition (PAD) on a scalable apparatus is investigated. In addition to the description of synthesis and process conditions regarding industrial scalability, the sprayed 30 μm-thick PAD films are examined optically and electrochemically in half cells and symmetrical cells with lithium metal electrodes. By categorizing the process data and the electrochemical results compared with common reported production methods, a statement about the suitability for the industrial production of ceramic solid electrolytes using PAD is provided.
Absolute Uniqueness of Phase Retrieval with Random Illumination
Creators: name: Fannjiang, Albert
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Random illumination is proposed to enforce absolute uniqueness and resolve all types of ambiguity, trivial or nontrivial, from phase retrieval. Almost sure irreducibility is proved for any complex-valued object of a full rank support. While the new irreducibility result can be viewed as a probabilistic version of the classical result by Bruck, Sodin and Hayes, it provides a novel perspective and an effective method for phase retrieval. In particular, almost sure uniqueness, up to a global phase, is proved for complex-valued objects under general two-point conditions. Under a tight sector constraint absolute uniqueness is proved to hold with probability exponentially close to unity as the object sparsity increases. Under a magnitude constraint with random amplitude illumination, uniqueness modulo global phase is proved to hold with probability exponentially close to unity as object sparsity increases. For general complex-valued objects without any constraint, almost sure uniqueness up to global phase is established with two sets of Fourier magnitude data under two independent illuminations. Numerical experiments suggest that random illumination essentially alleviates most, if not all, numerical problems commonly associated with the standard phasing algorithms.
description: 21 pages, 7 figures
Presentazione del volume
Paesaggi agrari. L’irrinunciabile eredità scientifica di Emilio Sereni

Shanghai, Fudan University, 30 ottobre 2012

Contenuti aggiuntivi a cura di Stefano Piastra





书籍的介绍
 
农业景观。艾米尼奥•赛莱尼不可遗弃的科学遗产

 
上海，复旦大学，2012年10月30日

 
补充内容由史提法诺(Stefano Piastra)负责
Creators: name: Piastra, Stefano
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: M-GGR/01 Geografia

description: CD di contenuti aggiuntivi bilingue, italiano/cinese, realizzato in occasione della presentazione del volume M. Quaini (a cura di), Paesaggi agrari. L'irrinunciabile eredità scientifica di Emilio Sereni (Milano 2011) presso la Fudan University (Shanghai, RPC, 30 ottobre 2012).

Il CD è a cura di Stefano Piastra.
Additional file 1: of Presence and diagnostic value of circulating tsncRNA for ovarian tumor
Creators: name: Peng, Eric
name: Shu, Yang
name: Wu, Yuke
name: Zeng, Feier
name: Tan, Shuangyan
name: Deng, Yun
name: Deng, Yiqi
name: Chen, Haining
name: Zhu, Lei
name: Xu, Heng
Publisher: name: figshare
Year: 2018
Subjects: subject: Space Science
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Inorganic Chemistry
subject: FOS: Chemical sciences
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology
subject: Virology
subject: Computational Biology

description: Table S1.List of serum samples belong to each diagnostic and histology types. Table S2. Primers for Reverse Transcript Quantitative PCR. (DOCX 18 kb)
Multi-level policies: a geographical approach to the analysis of innovation systems /Politiche multi-livello:
un approccio geografico all’analisi dei sistemi di innovazione
Creators: name: Grandi, Silvia
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2007
Subjects: SECS-P/06 Economia applicata

description: This paper extensively examine the relationship between territory, innovation and policies. While, reviewing the theoretical contribution of economic geographers and economists, the research identifies seven territorial models of innovation.
Further, the focus on the analysis of the territorial factors affecting innovation dynamics provides a geographical methodological approach useful for the analysis of innovation system at the various scales.
Finally, the theoretical and analytical methodologies set the basis to discuss innovation policies against territorial level (local, regional, national and international) and the relationship among them. Based also some practical case studies in three peculiar regions (Tunisia, Öresund, Emilia-Romagna), outcomes of the study shows how innovation policy tend to be multi-level, both with bottom-up and top-down approaches.
Degravitation Features in the Cascading Gravity Model
Creators: name: Moyassari, Parvin
name: Minamitsuji, Masato
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We obtain the effective gravitational equations on the codimension-2 and codimension-1 branes in the cascading gravity model. We then apply our formulation to the cosmological case and obtain the effective Friedmann equations on the codimension-2 brane, which are generically given in terms of integro-differential equations. Adopting an approximation for which the thickness of the codimension-2 brane is much smaller than the Hubble horizon, we study the Minkowski and de Sitter codimension-2 brane solutions. Studying the cosmological solutions shows that the cascading model exhibits the features necessary for degravitation of the cosmological constant. We also show that only the branch which does not have the smooth limit to the self-accelerating branch in five-dimensional model in the absence of the bulk gravity can satisfy the null energy condition as the criterion of the stability. Note that our solutions are obtained in a different setup from that of the original cascading gravity model in the sense that the codimension-1 brane contains matter fields other than the pure tension.
description: 18 pages, 2 figures, matched to the published version
title: Southern Africa
title: Southern Africa
Creators: name: Storey Kelleher, William
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Weltkrieg [1914-1918]
subject: Südafrika
subject: World War, 1914-1918
subject: Africa, Southern

description: The people of Southern Africa experienced the First World War as a continuation of late 19th century European imperialism. The war did not introduce new historical trends as much as it extended and exacerbated imperialism’s ill effects. In the region itself, there was only one significant military campaign: the South African invasion of German South-West Africa. However, the people of Southern Africa were voluntarily and coercively recruited for military and labor service in East Africa, France, and the Middle East. The recruits sustained heavy losses on these fronts, though this did little to change their status in Southern Africa.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
Analysis of buffer-trapping effects on current  reduction and pulsed I-V curves of GaN FETs
Creators: name: Takayanagi, H.
name: Nakano, H.
name: Horio, K.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: Two-dimensional transient analyses of GaNMESFETs are performed in which a three level compensation model is adopted for a semi-insulating bufferlayer, where a shallow donor, a deep donor and adeepacceptorare included. Quasi-pulsedI-V curves are derivedfromthe transient characteristics. It is shown that so called current collapse or current reduction is more pronounced foracase with higher acceptor density in the buffer layer,because trapping effects become more significant. It is also shown that the current reduction is more pronounced when the drain voltage is lowered from a higher drain bias during turn-on.
Low cost MMIC chipset for VSAT ground terminals
Creators: name: Butel, Y.
name: Langrez, D.
name: Villemazet, J.F.
name: Coury, G.
name: Decroix, J.
name: Cazaux, Jean-Louis
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: This paper presents results of a Ka-bandVSAT ground terminal MMIC chipset developed in a costreduction context. The first one, a low level multifunction designed for up-conversion with high gain driver, exhibits a17dB conversion gain with an associated P1dB output powerclose to +18dBm. The second one, a High Power Amplifier with embedded power detection, delivers 2W RF outputpower associated with 24dB of linear gain. This chipset combines performance, integration and low cost.
title: Memory of the War: Popular Memory 1918-1945, 1945 to the Present
title: Memory of the War: Popular Memory 1918-1945, 1945 to the Present
Creators: name: Brandt, Susanne
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Weltkrieg [1914-1918]
subject: Massenkultur
subject: World War, 1914-1918
subject: Popular culture

description: What role do representations of the First World War play in media that reach a wide audience beyond the circle of experts? The following contribution focuses on this important question. Given the wealth of popular media throughout the world from 1914-1918 to the present, it is not intended to be exhaustive, merely illustrative. The selected examples are used to demonstrate how the memories of the war were shaped and changed by the various media that enjoy a large audience. Emphasis will be placed on Western Europe, where those sites of memory are located that also continue to have the greatest influence on the memory of the First World War and preserve it through the musealization of former battlefields. Comprehensive overviews of several popular media in the countries treated here (and beyond) - especially in reference to literature, films, and art - can be found elsewhere in 1914-1918-online.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
title: Wartime and Post-war Economies (Spain)
title: Wartime and Post-war Economies (Spain)
Creators: name: Sánchez Picón, Andrés
name: García Gómez, José Joaquín
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Spanien
subject: Wirtschaft
subject: Geschichte
subject: Spain--Economic conditions--1918-1975

description: This article focuses on the impact of the First World War on the economy of neutral Spain. This period is usually considered as exceptional and one that did not have much of an influence on the structure or long-term evolution of Spain’s national economy. However, the First World War did have an enormous impact not only on countries at war, but also on the economies of the neutral countries. This is particularly true for Spain, which had very close economic ties with the belligerent parties.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
Modeling active electrolocation in weakly electric fish
Creators: name: Ammari, Habib
name: Boulier, Thomas
name: Garnier, Josselin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Numerical Analysis (math.NA)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35R30, 35J05, 31B10, 35C20, 78A30

description: In this paper, we provide a mathematical model for the electrolocation in weakly electric fishes. We first investigate the forward complex conductivity problem and derive the approximate boundary conditions on the skin of the fish. Then we provide a dipole approximation for small targets away from the fish. Based on this approximation, we obtain a non-iterative location search algorithm using multi-frequency measurements. We present numerical experiments to illustrate the performance and the stability of the proposed multi-frequency location search algorithm. Finally, in the case of disk- and ellipse-shaped targets, we provide a method to reconstruct separately the conductivity, the permittivity, and the size of the targets from multi-frequency measurements.
description: 37 pages, 11 figures
title: Egyptian Expeditionary Force
title: Egyptian Expeditionary Force
Creators: name: Kitchen, James E.
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Großbritannien. Egyptian Expeditionary Force
subject: Great Britain. Army. Egyptian Expeditionary Force

description: The Egyptian Expeditionary Force (EEF) was a British Army formation that conducted campaigns in Sinai, Palestine and Syria during 1916-18, and its battlefield successes played a prominent role in the destruction of the Ottoman Empire in the Levant.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
BFKL Evolution as a Communicator Between Small and Large Energy Scales
Creators: name: Kowalski, H.
name: Lipatov, L. N.
name: Ross, D. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze, in leading and next to leading order of BFKL, a possible influence of Beyond the Standard Model (BSM) effects on the structure of the discrete pomeron states. We show that the eigenvalues of the states which contribute significantly to the gluon density in the observable region are substantially modified by BSM effects irrespective of the assumptions about the infrared boundary conditions. We also develop a physically motivated heuristic model of the infrared boundary condition which determines the gluon structure function and argue, using this model, that the analysis of the present and future low-$x$ data could allow the detection of a supersymmetry scale in the multi-TeV range.
description: v3 contains additional explanations,v2 is identical to v1 with 3 superfluous figures removed, arXiv admin note: substantial text overlap with arXiv:1109.0432
Struktur-Eigenschafts-Untersuchungen an gebogenen Mesogenen
Creators: name: Bernasch, Ulrike
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2007
Subjects: subject: Elektronische Publikation
subject: Hochschulschrift
subject: Online-Publikation
subject: Zsfassung in engl. Sprache
subject: 541.04229

description: In den letzten Jahren haben sich Flüssigkristalle mit gebogener Molekülgestalt zu einem aktuellen Thema auf dem Gebiet der Flüssigkristallforschung entwickelt. Die Modifizierung dieser Strukturen führt zu einer Vielzahl flüssigkristalliner Phasen von denen insbesondere die antiferroelektrisch und ferroelektrisch schaltbaren smektischen Mesophasen von großem Interesse sind. Im Rahmen der vorliegenden Arbeit wurde das Mesophasenverhalten von Verbindungen mit gebogener Molekülgestalt untersucht. Sowohl die Struktur als auch die physikalischen Eigenschaften der auftretenden Mesophasen wurden charakterisiert. Bei der Mehrzahl der Mesogene wird die Biegung durch eine zentrale 1,3-Phenylen-Einheit realisiert. Zusätzlich werden homologe Reihen vorgestellt, deren Vertreter als zentrales Fragment ein vom N-Phenylpiperazin abgeleitetes Benzamid aufweisen, wobei die enthaltene Carbonylgruppe für die Biegung des Mesogens verantwortlich ist. Die gebogenen Mesogene unterscheiden sich sowohl in der Länge terminaler Alkylketten, im Typ und in der Richtung der Verknüpfungsgruppen als auch durch zentrale und terminale Substitution.
description: The study of liquid crystals formed by achiral bent-shaped molecules has grown rapidly in the last few years. The modification of this structures leads to various mesophases in which antiferroelectric or ferroelectric switching smectic phases are of special interest. The investigation of the mesophase behaviour of new bent-core compounds and the characterisation of the structure and the physical properties are the subject of this work. In the most cases the bending of the molecule is caused by a central 1,3-bisubstituted phenyl ring. Additionally homologue series are presented in which the central fragment is a benzamide derived from N-phenyl piperazine. In this case the bending of the molecules comes from the carbonyl group. The bent-core mesogens differ in the length of the terminal alkyl chains, in the type and the direction of the linking groups and in central and terminal substitution.
Electromechanical modelling of high power RF-MEMS switches with ohmic contact
Creators: name: Tan, S. G.
name: McErlean, E. P.
name: Hong, J. -S.
name: Cui, Z.
name: Wang, L.
name: Greed, R. B.
name: Voyce, D. C.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: This paper presents a study of the behaviour of electrically actuated RF-MEMS switches with ohmic contact. We will discuss about the relationship between the actuation voltage, displacement and the corresponding contact force experienced by the switch. We will demonstrate the linear behaviour of the switch when factors such as width or length of the switch arm are varied. Experimental results for DC actuation are also presented.
A performance analysis of a direct-conversion digital X-ray imager
Creators: name: Salhotra, Amith Kumar
Publisher: name: University of British Columbia
Year: 2014

description: In this thesis, the performance of direct-conversion digital X-ray imagers is evaluated using an elementary model that draws upon the material properties and the dimensions of the X-ray photoconductor employed within such imagers. Five possible X-ray photoconductors are considered in this analysis, namely amorphous selenium, cadmium zinc telluride, mercury iodide, lead iodide, and thallium bromide. The collected charge per unit area is the performance metric considered in this analysis. The collected charge per unit area related to the motion of the electrons and holes individually, and due the motion of both types of charge carriers, is evaluated. The fractional contributions to the collected charge per unit area is also evaluated. The application of both positive and negative biases to the radiation receiving terminals is considered. It is found that the collected charge per unit area, for the case of both positive and negative biases, is higher for the case of cadmium zinc telluride when compared with the other X-ray photoconductors considered in this analysis. This suggests that cadmium zinc telluride may be a better material to employ as the X-ray photoconductor within direct-conversion digital X-ray imagers.
title: Wartime and Post-war Societies (Spain)
title: Wartime and Post-war Societies (Spain)
Creators: name: Martorell Linares, Miguel Angel
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Spanien
subject: Sozialer Wandel
subject: Geschichte
subject: World War, 1914-1918 Spain
subject: Spain--Social conditions--1886-1939

description: A certain consensus exists in Spanish historiography regarding the First World War, one that connects the level of social conflict to a radical economic transformation. The economy grew spectacularly, but not everyone benefited from this boom since the massive exports of foodstuffs and raw materials provoked a continual subsistence crisis and a general increase in the cost of living that greatly harmed wage earners. This prompted intensive social mobilization, both during the war and as the economy returned to more normal patterns in the post-war years. Nevertheless, in spite of these conflicts, the Great War clearly accelerated the modernization of both the Spanish economy and society.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
A monolithic integrated 180 GHz SiGe HBT  Push-Push Oscillator.
Creators: name: ROUX, P.
name: BAEYENS, Y.
name: WOHLGEMUTH, O.
name: CHEN, Y.K.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: A fully integrated single-ended output push-push oscillator is realized using an advanced 0.2µm SiGe HBT process. Up to –5 dBm output power is achieved at 180 GHz using a technology with a transition frequency fT  of 200 GHz and maximum oscillation frequency fMAX of 275 GHz. Preliminary phase noise measurements show a phase noise of less than –90 dBc/Hz at 1 MHz offset from the 180 GHz carrier.
A 3D wideband package solution using MCM-D BCB technology for tile TR module
Creators: name: Barbier, T.
name: Mazel, F.
name: Reig, B.
name: Monfraix, P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: This paper describes the works performed on a solution of packaging dedicated to 3D TR modules in the 2-20GHz frequency range. The proposed solution is based on a non hermetic architecture involving organic and BCB substrates. The studied key bricks relative to assembly, vertical interconnections, passives integration are described and results consecutive to electrical and environmental evaluation are presented. A 3D TR module demonstrator taking benefit from the key bricks evaluated through test vehicles has been realised and its performances measured when submitted to airborne environmental constraints.
A Majorize-Minimize subspace approach for l2-l0 image regularization
Creators: name: Chouzenoux, Emilie
name: Jezierska, Anna
name: Pesquet, Jean-Christophe
name: Talbot, Hugues
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 65K10, 90C26, 68U10, 94A08, 47A52, 65F22

description: In this work, we consider a class of differentiable criteria for sparse image computing problems, where a nonconvex regularization is applied to an arbitrary linear transform of the target image. As special cases, it includes edge-preserving measures or frame-analysis potentials commonly used in image processing. As shown by our asymptotic results, the l2-l0 penalties we consider may be employed to provide approximate solutions to l0-penalized optimization problems. One of the advantages of the proposed approach is that it allows us to derive an efficient Majorize-Minimize subspace algorithm. The convergence of the algorithm is investigated by using recent results in nonconvex optimization. The fast convergence properties of the proposed optimization method are illustrated through image processing examples. In particular, its effectiveness is demonstrated on several data recovery problems.
title: Luckner, Felix, Graf von
title: Luckner, Felix, Graf von
Creators: name: Epkenhans, Michael
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: Luckner, Felix von
subject: Luckner, Felix, Graf von, 1881-1966

description: Felix Graf von Luckner, the so-called “sea-devil”, was a German naval officer. During the Great War he became famous as a successful, but always gallant raider in the South Sea, until the merchant raider under his command, the sailing-vessel ''Seeadler'', shipwrecked on a reef off the small island Mopelia (today Maupihaa).
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
Thermal management of power HBT inpulsed operating mode
Creators: name: Floriot, D.
name: Jacquet, J-C.
name: Chartier, E.
name: Coupat, J-M.
name: Eudeline, P.
name: Auxemery, P.
name: Blanck, H.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: We focus this paperon the improvement of the thermal management of power transistor based on the InGaP/GaAsHBT technology and specially for pulsed mode application Applied to very HB Thigh power transistor, from 10 W to 3W, respectively for L to Ku bands radar applications, a specific study has been done to suggest new opportunities if we take into account the transientor dynamic behavior of the transistor in pulse operating mode. From very short pulse (1µs)to very long pulse (≈1ms)a analysis has been performed with as a consequence a strong improvement of thermal impedance(Zth) through specific designs of the thermal shunt (material–shape)present at the front side. We chose to develop the concept of “thermal sponge” on power HBT transistor acting as avery efficient thermal capacitance to suppress thermal variation inside the pulse and improving as a consequence the CW thermal resistance. Two approaches have been compared: the first one with the support of very thick metal growth directly on the thin gold thermal shunt, the second one with a very small part of diamond substrate directly on top the same thermal shunt. As a conclusion, for long pulse application greater than 200µ sup to 1ms, the diamond approach gives superior result with 30%of improvement on the temperature rising.
title: High-Pitch CT Angiography of the Pulmonary Veins: Impact on Image Quality and Radiation Dose
Creators: name: Ezponda Casajús, Ana
Publisher: name: European Congress of Radiology
Year: 2019
Subjects: subject: Pulmonary vessels
subject: CT-Angiography
subject: Ablation procedures
subject: Dosimetric comparison

description: Aims and objectives Methods and materials Results Conclusion Personal information References
description: Aims and objectives: Atrial fibrillation (AF), the most common cardiac arrhythmia, is associated with a significant morbidity, mortality and economic costs. Over 65 years old, the prevalence of subclinical AF affects up to 30% of the individuals. Pulmonary vein ablation...
title: Making Sense of the War (USA)
title: Making Sense of the War (USA)
Creators: name: Little, Branden
Publisher: name: BSB - Bavarian State Library
Year: 2017
Subjects: subject: USA
subject: Öffentliche Meinung
subject: Weltkrieg [1914-1918]
subject: World War, 1914-1918--United States
subject: Public opinion

description: Americans comprehended the First World War as a disaster. Their understandings of neutrality and belligerency varied greatly depending on ancestral ties, class, race, and political perspectives. Despite strong anti-war currents of pacifism and socialism, most Americans eventually rejected non-intervention and embraced U.S. belligerency as a crusade to destroy aggression and restore peace in Europe.
description: 1914-1918-Online International Encyclopedia of the First World War
description: 1914-1918-Online International Encyclopedia of the First World War
A high-efficiency HBT-based class-E power amplifier for 2 GHz
Creators: name: Milosevic, Dusan
name: Van Der Tang, Johan
name: Van Roermund, Arthur
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: A Class-E power amplifier (PA) based on a GaAs heterojunction bipolar transistor (HBT) is presented. The single-ended single-stage PA delivers 24 dBm of output power at 2 GHz, achieves a peak power added efficiency (PAE) of 68% and exhibits an excellent transducer power gain higher than 16 dB. The PAE remains high over a wide output power range. The circuit contains the standard 50-Ohm input and output match and is capable of high-efficiency power amplification of constant-envelope signals, which has been demonstrated with the GMSK signal. Both lumped- and distributed-components concepts for the practical implementation of the load network are presented and discussed.
On Shimura's decomposition
Creators: name: Purkait, Soma
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11F37, 11F11

description: Let $k$ be an odd integer $\ge 3$ and $N$ a positive integer such that $4 \mid N$. Let $χ$ be an even Dirichlet character modulo $N$. Shimura decomposes the space of half-integral weight cusp forms $S_{k/2}(N,χ)$ as a direct sum of $S_0(N,χ)$ (the subspace spanned by 1-variable theta- series) and $S_{k/2}(N,χ,ϕ)$ where $ϕ$ runs through a certain family of integral weight newforms. The explicit computation of this decomposition is important for practical applications of a theorem of Waldspurger relating critical values of $L$-functions of quadratic twists of newforms of even weight to coefficients of modular forms of half-integral weight.
description: 12 pages, to appear in the International Journal of Number Theory
Konstruktion korrekter Codegeneratoren für Speicherprogrammierbare Steuerungen
Creators: name: Pollmächer, Dirk
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2008
Subjects: subject: Steuerung
subject: Modell
subject: Translation
subject: Zeitabhängigkeit
subject: Elektronische Publikation
subject: Hochschulschrift
subject: Online-Publikation
subject: Zsfassung in engl. Sprache
subject: 629.895545

description: Zur Entwicklung von Steuerungen werden häufig Modelle eingesetzt. Diese werden mit einem Übersetzer in ein Steuerprogramm übersetzt. Die Korrektheit der Übersetzung wird im Allgemeinen nicht garantiert. Das führt bei sicherheitskritischen Systemen zu einer Lücke bei der Sicherstellung der Korrektheit des Entwicklungsprozesses. Translation Validation schließt diese Lücke durch eine Überprüfung des erzeugten Programms. Diese Arbeit beschäftigt sich mit der Translation Validation realer Steuerungen mit Zeitbedingungen. Um dieses Ziel zu erreichen, wurde auf das Wissen aus dem Bereich von Zeitsystemen zurückgegriffen, wobei sowohl bestehende Techniken und Datenstrukturen angepasst als auch neue entwickelt wurden. Die vorgestellte Translation Validation erfüllt besondere Anforderungen, die sich durch die Verwendung realer Steuerungen, realer Zeitbedingungen und realer Modelle ergeben. Der komplexen Semantik der vorgegebenen Steuermodelle und -programme wird durch die Verwendung von SPS-Zeitautomaten als einfaches internes Basismodell begegnet. SPS-Zeitautomaten besitzen die Eigenschaften der Steuermodelle und -programme, was ein explizites Modellieren dieser Eigenschaften durch Zwischenzustände unnötig macht. Die Anzahl der Modellzustände und damit die Modellkomplexität steigt während der Translation Validation deshalb nicht zusätzlich an, was die Verarbeitung realer Modellgrößen ermöglicht.
description: Models are commonly used in controller development. A control program is generated by a compiler. In general the correctness of the compilation process is not assured. Especially for safety-critical systems this leads to a gap in the correctness of the development process. Translation Validation closes this gap by validation of the generated control program. This thesis applies the method of Translation Validation to real-world controllers with time conditions. For this purpose known methods and data structures from the scientific field of timed models were adapted and new ones created. The Translation Validation presented satisfies the requirements demanded by real-world controllers, real-world models and real-world time conditions. The complex semantics of the given control models and programs is tackled by the use of PLC-timed automata as an easy base model. These automata feature the attributes of the control models as well as the control program. This avoids the explicit construction of intermediate states otherwise necessary. Therefore the number of model states and thus the total complexity of the Translation Validation does not increase which allows the Translation Validation of real-world model sizes.
Improved technique for reflection performances in broadband variable gain low noise amplifiers
Creators: name: Kawashima, Munenari
name: Nakagawa, Tadao
name: Yamaguchi, Yo
name: Araki, Katsuhiko
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2005
Subjects: ING-INF/01 Elettronica

description: We propose an improved technique for reflection performances in broadband variable gain low noise amplifiers that does not require preamplifiers and buffer amplifiers. This technique controls the feedback circuit and main amplifier simultaneously to obtain constant input and output impedance values. When the amplifier’s gain changed, the reflection performance remained good. Amplifiers ranging from 750 MHz to 6 GHz fabricated using this technique showed an |S22| of less than -10 dB, a |S11| of less than -8 dB, and a variable gain range of more than 33 dB @ 2 GHz. Compared with conventional techniques, the |S22| showed a 6 dB improvement, the |S11|showed a 3 dB improvement, and the variable gain range showed an 8 dB improvement.
de Broglie Wavelength and Frequency of the Scattered Electrons in Compton Effect
Creators: name: Venugopal, Vinay
name: Bhagdikar, Piyush S
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The undergraduate courses on modern physics generally consider the particle interpretation of Compton effect. Motivated by a student's solution in an undergraduate examination on modern physics here we consider the wave characteristics of recoiled electrons in the Compton effect. The de Broglie wavelength, wave and clock frequency of the scattered electrons are expressed in terms of the wavelength and the frequency of the incident and the scattered photons respectively using the familiar particle interpretation of the Compton effect, where initially the electron is at rest and its spin is ignored. Both non-relativistic and relativistic cases are considered. Numerical values of de Broglie wavelength, wave and clock frequency of the scattered electron are calculated for an incident photon energy that was used in the original experiment of Compton as a function of the scattering angle of the recoiled electron. Considering the relativistic effects which are however insignificant for the de Broglie wavelength of the recoiled electron under these conditions, the minimum value obtained is in the range of X-rays. The non-relativistic de Broglie wave frequency obtained by neglecting the rest mass of the electron leads to an underestimation of its value. The implications of de Broglie wavelength and clock frequency for Compton scattering experiments are briefly discussed and possible extensions of the obtained mathematical formulations are indicated. The results are useful for understanding the wave-particle duality of the recoiled electron in the context of the Compton effect.
description: 8 pages, 2 figures, 1 table, Published in Physics Education(www.physedu.in)
Field reliability of GaAs emitters for fiber optic telecommunication systems
Creators: name: Battistella, L.
name: Bottini, R.
name: Fantini, F.
name: Magistrali, F.
name: Sala, D.
name: Vanzi, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1990
Subjects: ING-INF/01 Elettronica

description: GaAs based emitters are widely used in telecommunication systems, and will be probably the core of short haul communications, even if a lot of doubts still exist on their reliability and the few available field results are not too optimistic. For these reasons we decided to follow with a particular attention all the problems related to these devices, investigating reliability by means of accelerated tests and of an accurate survey of field troubles.                  In this paper, we first of all report our field data, coming from more than five years experience, which show that "reasonable" results (in the range of 2000 FITs for LDs), can be obtained with commercially available devices; as a second step, failure analysis allows to localize failures,thus understanding the appropriate corrective actions to be taken. highlighting the specific process report also same For chip related failures, detailed examples are reported, different failure mechanisms, that, when not related to defects, are the same found during accelerated tests; we examples of failures due to interconnections and packaging.