cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Memoria En Capas
Creators: name: ROMERO, CHRISTIAN
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Architecture
subject: FOS: Civil engineering
subject: Landscape architecture

description: This thesis targets La Union, El Salvador, specifically the village of Huisquil, a harbor town that faces poverty and unhealthy living conditions. The goal is to build a safer, cheaper, and more sustainable home alternative for impoverished communities by using 3D printing technology as the main construction method. The thesis employs social media such as Facebook Groups in the region and Instagram Polls to determine major design decisions. The homes will respect the culture by using native materials mixed with concrete to contour new homes that employ phenomenology or an architectural approach that concentrates on the study of consciousness and the objects of direct experience with a focus on light, vegetation, water and air. Traditional home building methods are inefficient, wasteful, and cost much more. The 2001 earthquake, economic turmoil and political unrest has affected thousands of families and this thesis focuses on how the layered home can serve as a modular beacon that encourages tranquility and stability within the community. The technological advancements will be used in a humanitarian way to protect this community through the architecture of homes.
Molecular functions of cell plate-associated phosphoinositides during plant somatic cytokinesis
Creators: name: Lin, Feng
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2018
Subjects: subject: Zytokinese; Zellplatte; Mitogen-aktivierte Proteinkinase 4; Endozytose; Phosphatidylinositol 4-Phosphat; Zytoskelett
subject: Cytokinesis; Cell plate; mitogen-activated protein kinase 4; endocytosis; phosphatidylinositol 4-phosphate; cytoskeleton
subject: 572

description: Somatische Zytokinese von Pflanzenzellen erfordert die Koordination von Vesikelverkehr mit der Zytoskelettstruktur des Phragmoplasten. Ziel dieser Arbeit war, die Funktion von Phosphatidylinositol 4-Kinasen (PI4Ks) und des Phospholipids Phosphatidylinositol 4-Phosphat (PtdIns4P) an der Zellplatte sich teilender Arabidopsis thaliana Zellen zu bestimmen. PI4Kbs und PtdIns4P zeigen sich als neue Regulatoren der Clathrin-vermittelten Endozytose an der Zellplatte. Weiterhin beeinflussen PI4Kβ und PtdIns4P die Ausbreitung des Phragmoplasten, die durch MPK4-vermittelte Phosphorylierung von Proteinen der MAP65-Familie gesteuert wird. PI4Kb ist ebenfalls ein Substrat für MPK4. Obwohl die Effekte dieser Modifikation unklar bleiben, weisen ähnliche Zytokinesedefekte von mpk4 und pi4kβ1 pi4kβ2 Mutanten und die genetische und physische Interaktion von PI4Kb mit MPK4 darauf hin, dass PI4Kb und MPK4 während der Zytokinese in einem Komplex agieren, der Membranverkehr und Mikrotubuli-Dynamik steuert.
description: Plant somatic cytokinesis requires membrane trafficking and the formation of coordinated cytoskeletal structures called phragmoplasts. The aim of this thesis was to determine the role of phosphatidylinositol 4-kinase (PI4K) and the phospholipid phosphatidylinositol 4-phosphate (PtdIns4P) at the cell plate of dividing Arabidopsis thaliana cells. PI4Kβ isoforms and PtdIns4P are found to be important new factors controlling clathrin-mediated endocytosis at the cell plate. Furthermore, PI4Kβ and PtdIns4P also influence phragmoplast expansion, which is controlled by MPK4-mediated phosphorylation of members of the MAP65 family. PI4Kβ is also a target of MPK4. While the regulatory effects of this modification remain obscure, similar cytokinetic defects of A. thaliana mpk4 and pi4kβ1 pi4kβ2 mutants as well as genetic and physical interaction of PI4Kβ1 and MPK4 suggest that during cytokinesis PI4Kβ and MPK4 act in a common pathway to coordinate membrane trafficking and microtubule dynamics.
Properties and construction of extreme bipartite states having positive partial transpose
Creators: name: Chen, Lin
name: Djokovic, Dragomir Z.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider a bipartite quantum system H_A x H_B with M=dim H_A and N=dim H_B. We study the set E of extreme points of the compact convex set of all states having positive partial transpose (PPT) and its subsets E_r={rho in E: rank rho=r}. Our main results pertain to the subsets E_r^{M,N} of E_r consisting of states whose reduced density operators have ranks M and N, respectively. The set E_1 is just the set of pure product states. It is known that E_r^{M,N} is empty for 1< r <= min(M,N) and for r=MN. We prove that also E_{MN-1}^{M,N} is empty. Leinaas, Myrheim and Sollid have conjectured that E_{M+N-2}^{M,N} is not empty for all M,N>2 and that E_r^{M,N} is empty for 13. We introduce the notion of "good" states, show that all pure states are good and give a simple description of the good separable states. For a good state rho in E_{M+N-2}^{M,N}, we prove that the range of rho contains no product vectors and that the partial transpose of rho has rank M+N-2 as well. In the special case M=3, we construct good 3 x N extreme states of rank N+1 for all N>3.
description: Updated version. 32 pages
A high-yield monolithic X-band four bit phase-shifter
Creators: name: Marescialli, L.
name: Massani, M.
name: Rapisarda, S.
name: Geronzi, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: A key element in a GaAs MMIC Transmit/Receive module for active Phased-array application is the phase-shifter needed for the electronic beam steering; because of the circuit complexity and usually large chip size the technological and electrical yield must be maximized. In the present work the design, realisation and performance of an X-band, four-bit phase shifter, using a high-yield technology and a tolerant electric circuit are described.
Transit time MESFET phase shifter
Creators: name: Walters, Peter C.
name: Pollard, Roger D.
name: Richardson, John R.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The phase shift of a signal through a common-source MESFET can be changed with little effect on the amplitude by altering the gate-drain spacing. The feasibility of employing this principle to realize a highly compact, monolithic phase shifter has been investigated. The behaviour of the devices with differing gate-drain spacing has been measured and modelled and a design for a monolithic implementation is presented.
Die Therapie der Humerusschaftfraktur - Ergebnisse unter besonderer Berücksichtigung des UHN (Eine Studie am Patientengut der MLU-Halle-Wittenberg aus dem Zeitraum vom 01.01.1996 - 30.11.1999)
Creators: name: Brehme, Kay
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2004
Subjects: Elektronische Publikation
Zsfassung in engl. Sprache

description: Die Zielstellung dieser Arbeit ist die Erfassung der an unserer Klinik behandelten Patienten mit Humerusschaftfrakturen und die Auswertung der Behandlungsergebnisse nach operativer und konservativer Therapie. Dabei galt dem seit dem 01.01.1996 eingeführten unaufgebohrten Humerusnagel (UHN) besondere Beachtung. Der UHN stellte zu dieser Zeit ein relativ neues Implantat dar. In einer retrospektiven Studie wurden 115 Humerusschaftfrakturen ausgewertet. Operativ wurden davon 94, 64 mit einem UHN versorgt. Der Vergleich mit den anderen im Zeitraum angewandten Therapieverfahren des eigenen Patientengutes und mit den in der Literatur publizierten Behandlungsergebnissen stand im Mittelpunkt dieser Arbeit. Nach Auswertung der systemspezifischen und allgemeinen Komplikationen sowie der funktionellen, subjektiven und radiologischen Ergebnisse nach einem Score von Kwasny (83) kann unserer Meinung nach der UHN sowohl zur Behandlung der frischen Humerusschaftfraktur als auch zur Versorgung von Humerusschaftpseudarthrosen empfohlen werden. Im Besonderen die retrograde Marknagelosteosynthese mit dem UHN stellt ein gutes und schonendes (biologisches) Frakturbehandlungsverfahren dar. Die Implantation des UHN ist aufgrund ihrer Vorteile (kleiner, frakturferner chirurgischer Zugang, vergleichsweise einfache Implantationstechnik) eine empfehlenswerte Alternative zur Plattenosteosynthese, und erweitert, auch aufgrund ihrer relativ geringen Komplikationsrate im Vergleich zur Behandlung mit dem Oberarm-Brace den Indikationsbereich zur Operation deutlich.
description: From 01.01.1996 until 31.08.1999, 113 patients with 115 fractures of the humerus diaphysis were treated at the martin - luther - university of Halle/Saale. The aim of the study was to evaluate the treatment of humerus diaphysis fractures with a special intramedullar nail system. We treated 92 patients (94 fractures) with a operative procedure, 64 of them with the unreamed humerus nail (UHN). A conservativ therapy were applied in 21 patients. Ninety nine patients of them had follow-up examinations after an average of 12 months. The analysis of of the clinical and radiological parameters was performed. For statistic evaluation we used the Kwasny score. Espacially the results after intramedullary stabilisation of the fractures showed good and excellent results. The advantage of the nail-system is the biological osteosynthesis with a small surgical appraoch, espacially in the retrograde technique. In conclusion we recommend the UHN in fractures and pseudarthrosis of the humeral diaphysis. Especially the retrograde implantation of the nail system is a very secure method and less of complications.
Theory of High T$_c$ Ferrimagnetism in a Multi-orbital Mott Insulator
Creators: name: Meetei, O. Nganba
name: Erten, Onur
name: Randeria, Mohit
name: Trivedi, Nandini
name: Woodward, Patrick
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a model for the multi-orbital material Sr$_2$CrOsO$_6$ (SCOO), an insulator with remarkable magnetic properties and the highest $T_c \simeq 725$ K among {\em all} perovskites with a net moment. We derive a new criterion for the Mott transition $(\widetilde{U}_{1} \widetilde{U}_{2})^{1/2}>2.5W$ using slave rotor mean field theory, where $W$ is the bandwidth and $\widetilde{U}_{1(2)}$ are the effective Coulomb interactions on Cr(Os) including Hund's coupling. We show that SCOO is a Mott insulator, where the large Cr $\widetilde{U}_{1}$ compensates for the small Os $\widetilde{U}_{2}$. The spin sector is described by a frustrated antiferromagnetic Heisenberg model that naturally explains the net moment arising from canting and also the observed non-monotonic magnetization $M(T)$. We predict characteristic magnetic structure factor peaks that can be probed by neutron experiments.
Insight on Multimodal Solar Flare Forecast With Explainable Deep Learning
Creators: name: Francisco, Gregoire
name: DEL MORO, DARIO
name: Barata, Teresa
name: Fernandes, João
name: Guastavino, Sabrina
name: Piana, Michele
Publisher: name: Zenodo
Year: 2024

description: Poster presented at the MCH23 Conference (April 2023, Sofia, Bulgary)

Insight on Solar Flare Forecast With Explainable Deep Learning

Solar Flares are sudden and violent release of magnetic energy from the Sun’s atmosphere in the form of electromagnetic radiation bursts. Being able to forecast Solar Flares accurately is essential to mitigate the risks associated with Space Weather, but it has been proven to be particularly challenging. Recently, Deep Learning Methods (DLMs) captured the interest of many re- searchers in the field and new data-driven approaches to the problem have been developed. With Explainability Methods (EMs) we can reverse this data-driven approach to gather insight on the actual physics of the events. We apply EMs to DLMs trained on Solar Corona images which perform as well as models trained on Solar Photosphere magnetograms alone to forecast Solar Flares in a 24h forecasting window. In these preliminary results we confirm that DL models efficiently learn known physical precursors, such as the presence of sigmoidal coronal structures, which are observational signatures of highly twisted and sheared magnetic fields in the Solar Corona. From this proof of concept we also verified that DL models trained on Solar Corona images can be efficient to forecast Flares near the Solar Limb, where it is harder for models using magnetograms alone. Model combining magnetograms and images of the different layers of the Solar Atmosphere seem to provide the best performances.
Psychosocial Syndemics Affecting Treatment Outcomes for Individuals Receiving Medication for Opioid Use Disorder
Creators: name: Kleinman, Mary Buckley
Publisher: name: Digital Repository at the University of Maryland
Year: 2020
Subjects: subject: Clinical psychology
subject: methadone
subject: opioid use disorder
subject: social determinants of health
subject: syndemics
subject: treatment outcomes

description: Successful engagement with medication treatment for opioid use disorder (MOUD) is an important focus in the fight against the opioid crisis. This study used qualitative methods to solicit feedback about barriers to successful outcomes in methadone maintenance treatment (MMT) and used these findings to build a conceptual framework of interaction. We recruited patients and staff from a community-based drug treatment center as well as peer recovery coaches who work in OUD recovery. Semi-structured interviews and focus groups asked about factors that influence MMT outcomes and how barriers co-occur and interact. Barriers described by participants fit into several broad themes: individual/self, social, institutional/structural, community/environmental, and stigma. Participants described co-occurrence of barriers as fueling the negative effect of one another. Understanding barriers to successful MOUD outcomes and considering their synergistic effect may assist with future identification and promotion of the types of interventions needed to effectively and efficiently mitigate their impact.
Massive Gravity on Curved Background
Creators: name: Alberte, Lasma
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 investigate generally covariant theories which admit a Fierz-Pauli mass term for metric perturbations around an arbitrary curved background. For this we restore the general covariance of the Fierz-Pauli mass term by introducing four scalar fields which preserve a certain internal symmetry in their configuration space. It is then apparent that for each given spacetime metric this construction corresponds to a completely different generally covariant massive gravity theory with different symmetries. The proposed approach is verified by explicit analysis of the physical degrees of freedom of massive graviton on de Sitter space.
description: Version accepted for publication; 17 pages
A new method for MMIC parametric yield realistic evaluations
Creators: name: Bastida, E.M.
name: Pagani, Maurizio
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The paper first reports some new results recently obtained at Alcatel-Telettra on the functional yield calculation for large MMICs.The parametric yield evaluation tools usually available for foundry customers are then critically discussed.Subsequently, a very wide and self consistent data base on the MMIC MESFET statistical behaviour is described. Finally, a semiempirical MESFET model is analyzed,which allows accurate forecasts of the MMIC parametric yield by using such data base.
Tragia lessertiana Müll. Arg.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Malpighiales
Euphorbiaceae
Tragia
Tragia lessertiana

description: 45. Tragia lessertiana (Baill.) Müll.Arg.
Guyanas, Brazil (Amapá, Maranhão, Pernambuco, Bahia) (Govaerts et al. 2000).
Selected Vouchers:—Piedade, 10 January 2008, Alves-Araújo et al. 799 (UFP, IPA).
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 18, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
Self-aligned proton implantation GaAs MESFET devices
Creators: name: Lanzieri, C.
name: D'Eustacchio, P.
name: Peroni, M.
name: Cetronio, A.
name: Ghione, G.
name: Pirola, M.
name: Carnera, A.
name: Gasparotto, A.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: In this work we will demonstrate that Self Aligned Proton Implantation (SAPI) devices give excellent transconductance linearity (i.e. virtually constant at approximately 150 mS/mm for drain current in the range ldss to 15% Idss) and increased output resistance. Said devices, with a 0.5x300 um gate geometry, typically yield 1.6 dB noise figure and 9.0 dB associated gain at 12 GHz.
A small-signal and noise model for the physics-based design and optimization of GaAs MESFET's for hybrid and monolithic MIC's
Creators: name: Ghione, G.
name: Bonani, F.
name: Pirola, M.
name: Naldi, C.U.
name: Sporkmann, T.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The paper describes a two-dimensional physical small-signal and noise model for GaAs MESFET's. The model can provide, on the basis of physical and geometrical input parameters only, a complete small-signal and noise performance characterization. The noise model is based on the efficient implementation of the classical impedance-field method for noise analysis within the framework of a frequency-domain numerical drift-diffusion physical model. Attention is devoted to the experimental validation of the model, which is carried out on a realistic case study (a 0.6um GMMT MESFET) by testing the DC, the small-signal and noise models against measurements. The role played by the high-field diffusivity in noise simulation is stressed and it is shown how a physics-based model for this parameter allows a good match to be achieved for both the noise figure and the optimum source impedance.
Vergleichende laufbandergometrische und dopplersonografische Untersuchungen bei Patienten mit einer peripheren arteriellen Verschlußkrankheit im Stadium IIa nach Fontaine
Creators: name: Teichler, Heike
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2000
Subjects: Zsfassung in engl. Sprache

description: Die periphere arterielle Verschlusskrankheit, als eine Manifestationsform der Arteriosklerosis obliterans, ist eine Erkrankung mit einer hohen Inzidenz und Prävalenz. Einer rationellen Diagnostik hinsichtlich einer Pro- oder Regression der pAVK kommt eine entscheidende Bedeutung zu. Die dopplersonografische Untersuchung der Patienten mit Bestimmung des tibio-brachialen Druckquotienten gibt Aufschluss über die Hämodynamik der von der peripheren arteriellen Verschlusskrankheit betroffenen Extremität. Die laufbandergometrisch bestimmte schmerzfreie Gehstrecke ermöglicht die funktionelle Einschätzung und Graduierung der Belastungsinsuffizienz im Stadium der Claudicatio intermittens. 115 Patienten mit einer peripheren arteriellen Verschlusskrankheit im Stadium IIa nach Fontaine wurden im Rahmen einer klinischen Phase-III-Studie in der angiologischen Spezialambulanz der Klinik für Innere Medizin III der Martin-Luther-Universität Halle-Wittenberg untersucht. Ziel der vorliegenden Arbeit war es, Einflussgrößen auf den Zusammenhang zwischen hämodynamischen und ergometrischen Parametern bei Patienten mit einer pAVK zu verifizieren und in ihrer Wertigkeit einzuschätzen. Für die gesamte Patientengruppe konnte eine signifikante Korrelation zwischen dem dopplersonografisch ermittelten tibio-brachialen Dopplerdruckquotienten und der laufbandergometrisch bestimmten schmerzfreien Gehstrecke nachgewiesen werden. Die differenzierte Analyse dieser Korrelation zeigte jedoch, dass zusätzliche Einflussgrößen wie das Alter des Patienten, die Lokalisation der stenosierenden Prozesse, persistierende Risikofaktoren und insbesondere die Komorbidität der Patienten eine hohe Variabilität des Zusammenhanges zwischen dem tibio-brachialen Dopplerdruckquotienten und der schmerzfreien Gehstrecke bedingen.
description: Arteriosclerosis is one of the important causes of death in the industrial states. One manifestation of arteriosclerosis is the peripheral arterial occlusive disease (paod). We examined 115 patients with paod in the state of claudication by a continous treatmill-testing and by dopplersonografy. The aim of the dissertation was to show, if there are any connections between the parameters of hemodynamic and function of the extremities, it meens between the ancle-brachial-pressure-index and the pain-free walking distance. We found a significant correlation between the ancle-brachial-pressure-index and the pain-free walking distance for patient in the state of intermittent claudication of paod. In conclusion of the results we can show, that many factors as the age of the patient, the localisation of the arteriosclerotic stenosis, the risk factors and the comorbidity of the patient especially diabetes have an important influence on the correlation of hemodynamic and functional parameters in patients with intermittent claudication.
Applications of laser ablation inductively coupled plasma mass spectrometry for monitoring impurities in solid foodstuff
Creators: name: Rodriguez Jule, José Carlos
Publisher: name: University of British Columbia
Year: 2014

description: The development of rapid and simple analytical methods that reliably monitor metal impurities in nutraceutical products is beneficial. An alternative solid sampling approach to quantify As, Cd, Hg, and Pb with LA-ICPMS is proposed in this work. This approach employs the incorporation of spiked organic binder standards with powdered raw materials in consistent ratios for the analysis of pressed pellets with LA-ICPMS. To date, LA-ICPMS calibration techniques have been limited by the inability to produce matrix matched standards and samples. This modified standard addition method provides a higher degree of matrix matching. It is hypothesized that LA-ICPMS will produce reliable analytical data for the analysis of elemental impurities in powders for the nutraceutical industry. Also, it is hypothesized that the incorporation of binders into analytical samples will be an effective way to accomplish standard addition. A Cetac LSX 500 266 nm Nd:YAG laser, and a Photon Machines Analyte G2 193 nm excimer laser were coupled to a Thermo XSeries2 ICP-MS to analyze berry, fiber and chondroitin samples in polyvinyl alcohol, microcrystalline and α-cellulose, and vanillic acid matrices under optimized laser conditions. USP 34 regulatory limits were used as guidelines to monitor As, Cd, Hg, and Pb. Quantification limits (LOQ) of 0.56, 0.13, 0.10, 0.10 μg/g were determined for As, Cd, Hg, and Pb respectively with the Nd:YAG laser. Similarly, the excimer laser gave LOQ of 0.063, 0.016, 0.057, 0.006 μg/g. All LOQ were capable of quantifying the impurities below regulatory limits. Accuracy validation with excimer laser gave recoveries ranging from 82 - 99% and 84 - 103% with scandium and yttrium normalizations in PVA respectively; the method precision met validation criteria of less than 20% RSD ranging from 5.4 to 19.8% for Pb and Hg respectively. Linearity validation studies gave R² values above 0.95 meeting acceptance criteria. The accuracy of Pb was maintained with both laser systems, and experimental values were within experimental uncertainty of the certified NIST 1547 and NIST 1486 reference values. The data supports that LA-ICPMS was a viable tool in generating reliable analytical data and that the incorporation of binders into samples effectively accomplished standard addition.
Extremal Limits and Kerr Spacetime
Creators: name: Pradhan, Parthapratim
name: Majumdar, Parthasarathi
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The fact that one must evaluate the near-extremal and near-horizon limits of Kerr space-time in a specific order, is shown to a lead to discontinuity in the extremal limit, such that this limiting space-time differs nontrivially from the precisely extremal space-time. This is established by first showing a discontinuity in the extremal limit of the maximal analytic extension of the Kerr geometry, given by Carter. Next, we examine the ISCO of the exactly extremal Kerr geometry and show that on the event horizon of the extremal Kerr black hole, it coincides with the principal null geodesic generator of the horizon, having vanishing energy and angular momentum. We find that there is no such ISCO in the near-extremal geometry, thus garnering additional support for our primary contention. We relate this disparity between the two geometries to the lack of a trapping horizon in the extremal situation.
description: 17 Pages, Latex 2e, no figures, Published version in EPJC
An investigation of microwave packaging and associated bonding techniques
Creators: name: Westcott, Christine
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The work described in this paper was carried out as an ESTEC Development Contract to study die attachment, wire bonding and packaging of gallium arsenide devices. A low mass and volume hermetic package suitable for single or multichip packaging was identified, and the mounting and wire bonding carried out within this package. The obiective of this work was to evaluate conductive epoxy resin die mounting and lid sealing, compare it with eutectic methods and to find if reliable thermosonic bonds could be made to devices without damaging the underlying material. All test pieces were subjected to long term high temperature storage, environmental or mechanical stress. Bond strengths and visual appearance were examined before and after stress testing together with particular requirements such as hermeticity of sealed packages. It was found that devices could be satisfactorily mounted in the packages using conductive epoxy resins, reliable thermosonic bonds made to the die without damaging the underlying material, and the package hermetically sealed using a conductive epoxy resin.
High resolution phase shifter for active phased array antenna beam forming
Creators: name: Feldle, Heinz-Peter
name: Reber, Rolf H.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The paper describes the design and measurement results of a monolithic single chip phase shifter. This broadband, 6-bit phase shifter exhibits very low overall insertion loss with remarkably low variation, good VSWR and exceptional phase performance with only 2.4 degrees RMS phase error over all 64 phase states across the entire 5-6 GHz band. Moreover the di­gital design leads to good stability with regard to temperature and voltage variation. These excellent performance data lead to minimum driver levels and high efficiency in Tx-mode, a distinct reduction of the noise figure in Rx-mode for the complete T/R-module and allow minimum calibration effort of the active phased array.
Superspin Glass Mediated Giant Spontaneous Exchange Bias in a Nanocomposite of BiFeO$_3$-Bi$_2$Fe$_4$O$_9$
Creators: name: Maity, Tuhin
name: Goswami, Sudipta
name: Bhattacharya, Dipten
name: Roy, Saibal
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We observe an enormous $\textit{spontaneous}$ exchange bias ($\sim$300-600 Oe) - measured in an unmagnetized state following zero-field cooling - in a nanocomposite of BiFeO$_3$ ($\sim$94%)-Bi$_2$Fe$_4$O$_9$ ($\sim$6%) over a temperature range 5-300 K. Depending on the path followed in tracing the hysteresis loop - positive (p) or negative (n) - as well as the maximum field applied, the exchange bias ($H_E$) varies significantly with $\mid-H_{Ep}\mid$ $>$ $\mid H_{En}\mid$. The temperature dependence of $H_E$ is nonmonotonic. It increases, initially, till $\sim$150 K and then decreases as the blocking temperature $T_B$ is approched. All these rich features appear to be originating from the spontaneous symmetry breaking and consequent onset of unidirectional anisotropy driven by "superinteraction bias coupling" between ferromagnetic core of Bi$_2$Fe$_4$O$_9$ (of average size $\sim$19 nm) and canted antiferromagnetic structure of BiFeO$_3$ (of average size $\sim$112 nm) via superspin glass moments at the shell.
description: 5 pages with 4 figures; published in Phys. Rev. Lett
The impact of flow, satisfaction and reputation on loyalty to MOOCs: the moderating role of extrinsic motivation
Creators: name: Arquero, José Luis
name: Romero-Frias, Esteban
name: García del Barrio, Salvador
Publisher: name: Zenodo
Year: 2024

description: Loyalty – users’ commitment to an institution or resource, involving its repeated use and recommending its use to others – and its explaining factors are of paramount importance in a Massive Open Online Course (MOOC), where participation is open and many actors with differing interests coexist. The present article tests a loyalty formation model by using satisfaction, flow state and reputation as explanatory factors. It also examines the role of extrinsic motivation (EM) as a potential moderator of inter-variable relationships. Data were gathered from questionnaires distributed to users of a MOOC offered by the University of Granada (Spain). Results indicate that EM plays an important moderating role in loyalty formation. Satisfaction, enjoyment and reputation are less important when EM is higher, whilst control appears to be more relevant to externally driven users. Practical implications include the recommendation to personalise users’ learning experience with different types of motivation in order to increase loyalty.
Cyrtocymura scorpioides H. Rob.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Asterales
Asteraceae
Cyrtocymura
Cyrtocymura scorpioides

description: 12. Cyrtocymura scorpioides (Lam.) H.Rob. (syn.: Vernonia scorpioides (Lam.) Pers.)
Mexico, Central America, Caribbean, Venezuela, Brazil (Pernambuco, Bahia), Peru, Argentina.
Selected Vouchers:—Macacos, Araújo et al. 292 (UFP, ULM); Zambana, Araújo et al. 340 (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 16, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
A 8 Watt high efficiency C band power amplifier
Creators: name: Telliez, I.
name: Marcillaud, S.
name: Pastre, J.P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: A 8 Watt C-band power module is reported. This power amplifier comprises two power MMICs combined in parallel and balanced between two Lange couplers on alumina substrate. At 25°C, an average power amplifier delivers a saturated output power higher than 38.5 dBm, with an associated gain of 14 dB and a power added efficiency higher than 27%, over the 5 GHz - 6 GHz bandwidth, under DC and RF pulse conditions. The best power amplifier exhibits the following performances : a saturated output power higher than 39 dBm, a gain of 15 dB, and an associated power added efficiency of 31 %.
Flight model GaAs MMIC procurement: industrial concerns
Creators: name: Bensoussan, A.
name: Coval, P.
name: Gregoris, G.
name: Pouysegur, M.
name: Cazaux, Jean-Louis
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The Gallium Arsenide Monolithic Microwave Integrated Circuits Technology (MMIC) is now mandatory for competitiveness in space business, ALCATEL ESPACE has to face the challenge of providing Flight Model MMIC based equipments by end of 1993. This paper will present how a practical MMIC Qualification program is presently being implemented. The used method consists to procure from a mature enough foundry large size wafers in order to merge foundry qualification and dice flight model procurement into the same operation.
Inflatable Acoustic Meta-Material
Creators: name: Husker, Haafiz
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Mechanical engineering
subject: FOS: Mechanical engineering

description: Acoustic metamaterials thus far have been either passive or employed stackingto produce wide range of results. With the advent of advanced additive manufacturing techniques, the ability to create novel metamaterials have increased. Usually these Acoustic Meta Material are passive like in case of Membrane-type and Plate-type metamaterials. They are usually thin membranes or plates consisting of periodic unit cells with added masses. Numerous studies have shown these metamaterials exhibit tunable anti resonances with transmission loss greater than their corresponding mass-law. In these studies, the tunability usually results in complex electrical architecture and furthermore, in most of the investigations it is assumed that the unit cell edges of the metamaterial are fixed. In this study, an innovative method is explored to create an active metamaterial that can be easily tuned. The proposed method distinguishes itself from past contributions by employs a unique unit cell design that is fabricated via advanced additive manufacturing to create a metamaterial that exhibits negative Poison’s ratio with adjustable unit cell edges for greater transmission loss than its mass-law would otherwise suggest. The membrane like Metamaterial is tuned by inflating itself with pressurized air. The pressurization leads to large non-linear deformation and geometric stiffing in the membrane apart from adding mass by expanding its elastic unit cell edges. Which is exploited to adjust the eigen-modes and sound loss of the structure. The veracity of this proposed design is then investigated analytically and experimentally. The metamaterial is manufactured using elastic material called Agilus-30 via Multi-jet Manufacturing and is tested in an impedance tube to see its trans- mission loss. Finite elemental analysis is done to reduce the computational effortin creating an analytical model. The finite element analysis is compared with the experimental results to arrive at a consensus. The proposed metamaterial is then tested in real life application by conducting frequency response on a headphone with the IAMM installed to truly understand, the performance of such a setup. The results of these tests indicate the range of performance across low and high frequency as well as the versatility of the metamaterial to be adapted into any size as per the requirement
Method to solve integral equations of the first kind with an approximate input
Creators: name: Efros, V. D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Nuclear Theory (nucl-th)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Techniques are proposed for solving integral equations of the first kind with an input known not precisely. The requirement that the solution sought for includes a given number of maxima and minima is imposed. It is shown that when the deviation of the approximate input from the true one is sufficiently small and some additional conditions are fulfilled the method leads to an approximate solution that is necessarily close to the true solution. No regularization is required in the present approach. Requirements on features of the solution at integration limits are also imposed. The problem is treated with the help of an ansatz proposed for the derivative of the solution. The ansatz is the most general one compatible with the above mentioned requirements. The techniques are tested with exactly solvable examples. Inversions of the Lorentz, Stieltjes and Laplace integral transforms are performed, and very satisfactory results are obtained. The method is useful, in particular, for the calculation of quantum-mechanical reaction amplitudes and inclusive spectra of perturbation-induced reactions in the framework of the integral transform approach.
description: 28 pages, 1 figure; the presentation is somewhat improved; to be published in Phys. Rev. E
Electrothermal harmonic balance simulation of an INGAP/GAAS HBT based on 3D thermal and semiconductor transport models
Creators: name: Sommet, R.
name: Lopez, D.
name: Quéré, R.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A parallel implementation of the direct coupling of InGaP/GaAs HBT transport equations has been included in an Harmonic Balance simulator. Several results such as a class AB amplifier for mobile communication study and a stability analysis of “crunch effect” in multi-finger HBT have been performed.
Tracking sic FET developments with a FET simulator
Creators: name: Ladbrooke, P.H.
name: Bridge, J.P.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: SiC FETs promise high voltage working, high output power and a high impedance level for easy matching in applications at low gigahertz freque cies.RF SiC FETs development has bee supported by practical investigation of dispersio using a pulsed I(V)measurement system,a d by relating the multi-bias S -parameter behaviour of the devices to their material and structural features using a FET simulator.The simulator has been evolved through application i the GaAs industry. Modelling dispersion in all technologies is problematic because,whereas the origin of dispersion  an be identified experimentally,the mechanism is ot know in enough detail to include other tha a ge eric model of it in the simulator. Nonetheless,the simulator is useful for interpreting practical device behaviour and for examining the likely performance benefits of any proposed changes to SiC FET structure.
The Impacts of Branched Chain Amino Acid Supplementation on Adipocyte Function
Creators: name: Gregory, Tabitha
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Animal sciences
subject: Nutrition
subject: adipocyte function
subject: adipose
subject: Branched chain amino acids

description: The branched chain amino acids (BCAAs) are three essential amino acids: valine, leucine, and isoleucine. Adipose tissue has high rates of BCAA degradation and this has been shown to fuel normal function. Recent literature highlights cross- talk between BCAAs, lipid metabolism, and mitochondrial dysfunction. The objective of this thesis is to determine the impact of BCAA supplementation on adipose development, morphology, and various aspects of energy metabolism including BCAA degradation and lipolysis.C57-BL6N mice were reared on either low-fat (LF), LF with 150% BCAAs (LB), high-fat (HF), or HF with 150% BCAAs (HB) diets for 12-34 weeks. Adipose tissue morphology and energetics were determined. Results demonstrated that BCAA supplementation reduced lipid storage in visceral adipose depots, lowered circulating leptin, and reduced lipid accumulation in brown adipose tissue. BCAA supplementation also induced lipolysis, which raised circulating fatty acids. These results could have implications in the treatment and prevention of metabolic diseases.
The Atacama Cosmology Telescope: Relation Between Galaxy Cluster Optical Richness and Sunyaev-Zel'dovich Effect
Creators: name: Sehgal, Neelima
name: Addison, Graeme
name: Battaglia, Nick
name: Battistelli, Elia S.
name: Bond, J. Richard
name: Das, Sudeep
name: Devlin, Mark J.
name: Dunkley, Joanna
name: Dünner, Rolando
name: Gralla, Megan
name: Hajian, Amir
name: Halpern, Mark
name: Hasselfield, Matthew
name: Hilton, Matt
name: Hincks, Adam D.
name: Hlozek, Renée
name: Hughes, John P.
name: Kosowsky, Arthur
name: Lin, Yen-Ting
name: Louis, Thibaut
name: Marriage, Tobias A.
name: Marsden, Danica
name: Menanteau, Felipe
name: Moodley, Kavilan
name: Niemack, Michael D.
name: Page, Lyman A.
name: Partridge, Bruce
name: Reese, Erik D.
name: Sherwin, Blake D.
name: Sievers, Jon
name: Sifón, Cristóbal
name: Spergel, David N.
name: Staggs, Suzanne T.
name: Swetz, Daniel S.
name: Switzer, Eric R.
name: Wollack, Ed
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the measured Sunyaev-Zel'dovich (SZ) flux from 474 optically-selected MaxBCG clusters that fall within the Atacama Cosmology Telescope (ACT) Equatorial survey region. The ACT Equatorial region used in this analysis covers 510 square degrees and overlaps Stripe 82 of the Sloan Digital Sky Survey. We also present the measured SZ flux stacked on 52 X-ray-selected MCXC clusters that fall within the ACT Equatorial region and an ACT Southern survey region covering 455 square degrees. We find that the measured SZ flux from the X-ray-selected clusters is consistent with expectations. However, we find that the measured SZ flux from the optically-selected clusters is both significantly lower than expectations and lower than the recovered SZ flux measured by the Planck satellite. Since we find a lower recovered SZ signal than Planck, we investigate the possibility that there is a significant offset between the optically-selected brightest cluster galaxies (BCGs) and the SZ centers, to which ACT is more sensitive due to its finer resolution. Such offsets can arise due to either an intrinsic physical separation between the BCG and the center of the gas concentration or from misidentification of the cluster BCG. We find that the entire discrepancy for both ACT and Planck can be explained by assuming that the BCGs are offset from the SZ maxima with a uniform random distribution between 0 and 1.5 Mpc. Such large offsets between gas peaks and BCGs for optically-selected cluster samples seem unlikely given that we find the physical separation between BCGs and X-ray peaks for an X-ray-selected subsample of MaxBCG clusters to have a much narrower distribution that peaks within 0.2 Mpc. It is possible that other effects are lowering the ACT and Planck signals by the same amount, with offsets between BCGs and SZ peaks explaining the remaining difference between measurements. (Abridged)
description: 10 pages; version matches that accepted by ApJ - minor additions to text
Application of neural networks to efficient design of wireless and RF circuits and systems
Creators: name: Goyal, Ravender
name: Veremey, Vladimir
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Complexity of RF designs in a wireless system continues to increase significantly, to support multiple standards, multiple frequency bands, need for higher bandwidth and stringent adjacent channel specifications. Using existing design tools, time required to carry out a virtual prototyping of such complex circuits and their trade- off analysis with the baseband circuitry, is unacceptably long, because both the circuit simulation and optimization procedures can be very time-consuming. In this paper we show how Xpedion Design Systems, Inc. can considerably speed up, the modeling of RF circuits by using the neural network approach. Also, these neural net based C models are in industry standard format, and hence compatible with circuit level and system level simulators for accurate trade-off analysis of a wireless system, early in the design process.
A geometric path from zero Lyapunov exponents to rotation cocycles
Creators: name: Bochi, Jairo
name: Navas, Andrés
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: Differential Geometry (math.DG)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 37H15, 53C35, 22F30

description: We consider cocycles of isometries on spaces of nonpositive curvature $H$. We show that the supremum of the drift over all invariant ergodic probability measures equals the infimum of the displacements of continuous sections under the cocycle dynamics. In particular, if a cocycle has uniform sublinear drift, then there are almost invariant sections, that is, sections that move arbitrarily little under the cocycle dynamics. If, in addition, $H$ is a symmetric space, then we show that almost invariant sections can be made invariant by perturbing the cocycle.
description: To appear in Ergodic Theory and Dynamical Systems. The title was reverted to a previous one. Some modifications were made according to the referee's suggestions. We also included an alternative proof of Theorem A
Wavelet decomposition of harmonic functions in growth spaces
Creators: name: Eikrem, Kjersti Solberg
name: Malinnikova, Eugenia
name: Mozolyako, Pavel A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 31B25, 42C40, 60G46

description: Spaces of harmonic functions in upper half-space with controlled growth near the boundary are described in terms of multiresolution approximations. The results are applied to prove the law of the iterated logarithm for the oscillation of harmonic functions along vertical lines.
description: 18 pages
Artificial neural network approach for MMIC passive and active device characterization
Creators: name: Giannini, F.
name: Leuzzi, G.
name: Orengo, G.
name: Albertini, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Artificial neural networks (ANNs)are presented for the fast and accurate modeling of passive and active devices in MMICs.ANNs trained with S-parameter over a wide range of frequencies were  used for rectangular spiral inductor modeling and HEMT device small-signal models.After training and testing the ANN S-parameter model can be implemented as a two-port network into commercial circuit simulators.This enable the ANN model to be used in the design,analysis,and optimization of microwave circuits.A combination of ANN models trained with S-parameter and dc drain current measurements was implemented into an HP microwave circuit simulator to provide a small- signal bias-dependent active model.The proposed technique is capable of providing easy,fast and accurate simulation models for MMIC components where models based on equivalent circuit parameters (ECPs)do not exist or are not accurate over the desired region of operation.