cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Modelling of impaired cerebral blood flow due to gaseous emboli
Creators: name: Hague, J. P.
name: Banahan, C.
name: Chung, E. M. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Bubbles introduced to the arterial circulation during invasive medical procedures can have devastating consequences for brain function but their effects are currently difficult to quantify. Here we present a Monte-Carlo simulation investigating the impact of gas bubbles on cerebral blood flow. For the first time, this model includes realistic adhesion forces, bubble deformation, fluid dynamical considerations, and bubble dissolution. This allows investigation of the effects of buoyancy, solubility, and blood pressure on embolus clearance. Our results illustrate that blockages depend on several factors, including the number and size distribution of incident emboli, dissolution time and blood pressure. We found it essential to model the deformation of bubbles to avoid overestimation of arterial obstruction. Incorporation of buoyancy effects within our model slightly reduced the overall level of obstruction but did not decrease embolus clearance times. We found that higher blood pressures generate lower levels of obstruction and improve embolus clearance. Finally, we demonstrate the effects of gas solubility and discuss potential clinical applications of the model.
Perspectives  of  multi-heterojunction  HFET's  for  power amplification in millimeter wave range
Creators: name: Crosnier, Y.
name: Theron, D.
name: Bonte, B.
name: Coupez, T.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: There is a considerable interest in the development of high power, high efficiency HFETs for millimeter wave applications. Thanks to the great progress accomplished during the last few years in MBE growth multiheterojunction devices have reach such a maturity that they now offer attractive capabilities. This paper reports on results obtained with especially designed structures and discusses their optimization on the basis of modelling and characterizations. It shows that devices with more than 1A of drain current, 10 V of Breakdown voltage, 60 GHz of cut-off frequency  are   now   within   the   realm   of   possibility.
Ka-band HEMT-based low noise amplifier modules
Creators: name: Corazza, G.E.
name: Limiti, E.
name: Miceli, A.
name: Pardini, R.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: A two-stage low noise amplifier module for the 35.5 - 36.5 GHz band has been designed and developed. The amplifier is based on a conventional high electron mobility transistor (HEMT) with 0.25 um gate length. An equivalent circuit model for this device was derived from measuraments up to 18 GHz. The amplifier module has been implemented in a hybrid form on 0.254 mm AI2O3 substrate. A noise figure of 2.9 dB with an associated gain of 6.8 dB (coax to microstrip transitions loss included) have been measured at 35.8 GHz. In-band flatness is better than ± 0.15 dB for noise figure and ± 0.5 dB for associated gain.
Interdigitated planar Schottky varactor diodes for tunable MMIC applications
Creators: name: Lucyszyn, Stepan
name: Green, Ged
name: Robertson, Ian D.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: Techniques are presented for scale modelling interdigitated Planar Schottky Varactor Diodes (PSVDs) using an equivalent circuit model. A selection of low cost GaAs devices, with variations in the finger width and number of anode fingers, have been fabricated, measured and accurately characterized - well into the millimetric frequency range. From the results, a number of useful design rules are presented for the optimal choice of interdigitated PSVD topography. With the use of these rules, a 24x300 um experimental PSVD was accurately characterised.
Bias conditions for accurate parasitics evaluation of microwave MESFETs up to mm-wave frequencies
Creators: name: Leuzzi, G.
name: Deiseroth, K.
name: Giannini, F.
name: DeSantis, B.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: The correct conditions for the accurate evaluation of parasitic elements in microwave and millimetre-wave MESFETs from measurements are described. The elements are evaluated directly without any "fitting" procedure, and prove to be bias-independent and constant up to mm-wave frequencies. The intrinsic elements can then be accurately evaluated, and a bias-dependent, non-linear model established.
60 GHz low noise HEMT MMIC amplifiers and their characterization
Creators: name: Bourne, P.
name: Paris, E.
name: Redon, T.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: Recent advances achieved in both the high frequency characteristics of microwave probes and the precision and stability of the hardware of the vector network analyzer have extended the present working domain to the millimeter wave length range. These performant measurements have been carried out. They have allowed the realization of a monolithic V-band low noise amplifier. It consists of two stages using 0.25 um HEMTs, and it exhibits more than 12 dB gain with 5 ± 0.5 dB noise over 10% frequency range at 57 GHz. The chip size (including matching and biasing circuits) is 1.0 x 1.5 mm2.
A class of rotationally symmetric quantum layers of dimension 4
Creators: name: Mao, Jing
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 34L05, 81Q10

description: Under several geometric conditions imposed below, the existence of the discrete spectrum below the essential spectrum is shown for the Dirichlet Laplacian on the quantum layer built over a spherically symmetric hypersurface with a pole embedded in the Euclidean space R4. At the end of this paper, we also show the advantage and independence of our main result comparing with those existent results for higher dimensional quantum layers or quantum tubes.
description: 12 pages. A slight different version of this paper has appeared in J. Math. Anal. Appl
Syzygy algebras for the Segre embeddings
Creators: name: Netay, Igor V.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics

description: We describe the syzygy spaces for the Segre embedding $\mathbb{P}(U)\times\mathbb{P}(V)\subset\mathbb{P}(U\otimes V)$ in terms of representations of ${\rm GL}(U)\times {\rm GL}(V)$ and construct the minimal resolutions of the sheaves $\mathscr{O}_{\mathbb{P}(U)\times\mathbb{P}(V)}(a,b)$ in $D(\mathbb{P}(U\otimes V))$ for $a\geqslant-\dim(U)$ and $b\geqslant-\dim(V)$. Also we prove some property of multiplication on syzygy spaces of the Segre embedding.
description: 17 pages, 11 pictures
Process technology evaluation for high yield reproducible HEMT/PM-HEMT MMIC fabrication
Creators: name: Cetronio, A.
name: Ciceroni, S.
name: Graffitti, R.
name: Lanzieri, C.
name: Peroni, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: In this article we will report on a high yield HEMT/PM-HEMT technology, based an optimised ohmic contact formation and gate recessing. With this technology active device fabrication yields are better than 90% and corresponding key parameter tollerances always better than ± 5%, as required for high yield MMIC fabrication.
Urban-PLUMBER: Site information webpage (archive of https://urban-plumber.github.io/sites)
Creators: name: Lipson, Mathew
name: Grimmond, Sue
name: Best, Martin
name: Christen, Andreas
name: Coutts, Andrew
name: Crawford, Ben
name: Heusinkveld, Bert G.
name: Velasco, Eric
name: Ward, Helen Claire
name: Sugawara, Hirofumi
name: Hong, Je-Woo
name: Hong, Jinkyu
name: Evans, Jonathan
name: McFadden, Joeseph P.
name: Lee, Keunmin
name: Fortuniak, Krzysztof
name: Järvi, Leena
name: Roth, Matthias
name: Chrysoulakis, Nektarios
name: Tapper, Nigel
name: Michels, Oliver
name: Kotthaus, Simone
name: Earl, Stevan
name: Jo, Sungsoo
name: Masson, Valéry
name: Chow, Winston
name: Pawlak, Wlodzimierz
name: Kim, Yeon-Hee
Publisher: name: Zenodo
Year: 2021
Subjects: urban flux tower observations land surface model evaluation

description: A snapshot of web pages describing the site location information and observations used in the Urban-PLUMBER model evaluation project for urban areas (2021-09-16). Observational data files themselves are NOT included. Access to observational data files must be separately negotiated with data owners. Live webpage available at: https://urban-plumber.github.io/sites
description: This study was supported by the Australian Research Council (ARC) Centre of Excellence for Climate System Science (grant CE110001028) and ARC Centre of Excellence for Climate Extremes (grant CE170100023).
Extended Joseph polynomials, quantized conformal blocks, and a q-Selberg type integral
Creators: name: Rimányi, R.
name: Tarasov, V.
name: Varchenko, A.
name: Zinn-Justin, P.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider the tensor power $V=(C^N)^{\otimes n}$ of the vector representation of $gl_N$ and its weight decomposition $V=\oplus_{λ=(λ_1,...,λ_N)}V[λ]$. For $λ= (λ_1 \geq ... \geq λ_N)$, the trivial bundle $V[λ]\times \C^n\to\C^n$ has a subbundle of q-conformal blocks at level l, where $l = λ_1-λ_N$ if $λ_1-λ_N> 0$ and l=1 if $λ_1-λ_N=0$. We construct a polynomial section $I_λ(z_1,...,z_n,h)$ of the subbundle. The section is the main object of the paper. We identify the section with the generating function $J_λ(z_1,...,z_n,h)$ of the extended Joseph polynomials of orbital varieties, defined in [DFZJ05,KZJ09]. For l=1, we show that the subbundle of q-conformal blocks has rank 1 and $I_λ(z_1,...,z_n,h)$ is flat with respect to the quantum Knizhnik-Zamolodchikov discrete connection. For N=2 and l=1, we represent our polynomial as a multidimensional q-hypergeometric integral and obtain a q-Selberg type identity, which says that the integral is an explicit polynomial.
RF performance of GaAs/Si/Si MESFETs for MIMICs
Creators: name: Halkias, George
name: Georgakilas, Alexandros
name: Papavassiliou, Christos
name: Perantinos, George
name: Lagadas, Michael
name: Konstantinidis, George
name: Christou, A.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 1992
Subjects: ING-INF/01 Elettronica

description: It is shown that an intermediate Si epitaxial layer in the GaAs on Silicon system is critical for attaining state of the art MESFET microwave performance. Devices with gate length of 1.3um and width 180um showed unit current gain cutoff frequency (ft) up to 18GHz and maximum power gain cutoff frequency (fmax) of about 30GHz. These results indicate that MMICs can be developed on GaAs/Si/Si wafers with a processing technology suitable for GaAs-Si monolithic integration. The critical requirements for MMICs on Si are also presented.
A novel measurement method for the extraction of dynamic Volterra Kernels of microwave power amplifiers
Creators: name: Le Gallou, N.
name: Barataud, D.
name: Buret, H.
name: Nebus, J.M.
name: Ngoya, E.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A novel measurement method for the behavioral modeling of power amplifiers is presented.The proposed method is based on the use of a specific configuration of a vector network analyzer.The principle consists in measuring under two excitation,a parametric and a conversion gain of an amplifiers versus the magnitude of the large input signal carrier.
The existence of superluminal particles is consistent with the kinematics of Einstein's special theory of relativity
Creators: name: Székely, Gergely
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Within an axiomatic framework of kinematics, we prove that the existence of faster than light particles is logically independent of Einstein's special theory of relativity. Consequently, it is consistent with the kinematics of special relativity that there might be faster than light particles.
description: 19 pages, 3 figures
Investigating the Stability of the Blue Whirl
Creators: name: Price, Lanford
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Energy
subject: Blue whirl
subject: Fuel flexible
subject: Soot free

description: The blue whirl, recently discovered while studying oil spill remediation over a water surface, sparked interest because of its soot free, fuel flexible nature. Preliminary experimentation, performed with buoyancy induced airflow via two lifted and offset quartz glass half-cylinder shells, revealed information about the flame’s structure, flow profile, and exhaust gas emissions and particulate. Additionally, several computational models produced results detailing flame structure and flow field. Questions regarding the impact of forced flow conditions and fuel type on flame stability and formation, however, remain unanswered. To answer these questions, an advanced experimental apparatus was developed. Varying forced airflow and fuel types were tested and measured against blue whirl flame stability. Further, hysteresis tests for airflow and fuel flow were performed. Stable blue whirls were observed across each airflow profile and fuel type. System response to fuel type was seen to be non-uniform. Lastly, hysteresis was only observed for airflow.
Tetracera breyniana Schltdl.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Dilleniales
Dilleniaceae
Tetracera
Tetracera breyniana

description: 40. Tetracera breyniana Schltdl.
Brazil (Rio Grande do Norte, Ceará, Pernambuco, Bahia, Rio de Janeiro).
Selected Vouchers:—Zambana, Albuquerque & Rocha 440 (IPA, ULM).
DIOSCOREACEAE
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
RF versus Microwave High Efficiency PA Design
Creators: name: Colantonio, P.
name: Giannini, F.
name: Leuzzi, G.
name: Limiti, E.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: In this paper a comparison between classical Class E and new Class FG power amplifier design strategies are presented,to evaluate which method is best suited for high efficiency performance when operating frequency lies in the low microwave range.Fundamental design guidelines are briefly discussed and the Class E strategy is critically revisited with a frequency domain approach,stressing the differences with the Class FG.Finally,in order to validate the analysis,measured performances of a realised Class FG PA will be presented and compared with the simulated results of a Class E PA.For the same operating conditions,Class FG amplifier exhibits superior performances,with a maximum PAE of 59.8%(measured 58.8%)and a saturated output power of 25dBm,compared to 48%and 24dBm of Class E.Moreover,the 1dB compression point is 3dB higher for the Class FG.
Using Average RF Gate and Drain Currents to Determine Gain Compression Mechanisms for Narrow-recessed and Wide-recessed MESFETs
Creators: name: Meng, C.C.
name: Chen, J. W.
name: Chang, C.H.
name: Chen, L.P.
name: Lee, H.Y.
name: Kuan, J.F.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Knee voltage, pinch-off voltage, breakdown voltage and maximum rf drain current clip output I-V waveform of a MESFET and cause gain compression and power saturation. Thus, verage rf gate and drain currents can be used to determine gain compression mechanisms for MESFETs. There is a distinct signature in average rf gate and drain currents for each gain compression mechanism. Narrow recess and wide recess MESFET exhibits different average rf gate and drain current behavior when a device is biased toward maximum drain current. The average rf drain current decreases for a wide-recessed MESFET when the device is biased toward maximum drain current and tuned for maximum output power.
Non-thermal p/pi ratio at LHC as a consequence of hadronic final state interactions
Creators: name: Steinheimer, Jan
name: Aichelin, Jörg
name: Bleicher, Marcus
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recent LHC data on Pb+Pb reactions at sqrt(s_{NN})=2.7 TeV suggests that the p/pi is incompatible with thermal models. We explore several hadron ratios (K/pi, p/pi, Lambda/pi, Xi/pi) within a hydrodynamic model with hadronic after burner, namely UrQMD 3.3, and show that the deviations can be understood as a final state effect. We propose the p/pi as an observable sensitive on whether final state interactions take place or not. The measured values of the hadron ratios do then allow to gauge the transition energy density from hydrodynamics to the Boltzmann description. We find that the data can be explained with transition energy densities of 840 +- 150 MeV/fm^3.
description: 4 pages, 2 figures, version accepted by PRL
Stability analysis of multi-transistor microwave power amplifiers
Creators: name: Costantini, A.
name: Vannini, G.
name: Filicori, F.
name: Santarelli, A.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: Stability analysis of structures composed of transistors “paralleled” by means of power dividers/combiners is a keypoint in the design of MMIC power amplifiers. However, techniques to cope with this problem are quite rare in the literature and standard, straightforward tools are usually not available in CAD programs. A new simplified approach, hich can be applied using conventional linear tools for microwave circuit analysis, is proposed in this paper.
An analysis of the optical response of amorphous semiconductors with distributions of defect states
Creators: name: Chowdhury, Shamsul Azam
Publisher: name: University of British Columbia
Year: 2014

description: Defects play an important role in shaping the optical response of a semiconductor material. In this thesis, models for the spectral dependence of the imaginary part of the dielectric function, for the specific case of defective amorphous semiconductors, are considered. Within the framework of a joint density of states functional analysis, closed-form expressions are derived for the imaginary part of the dielectric function, with defect states taken into account. Both valence band and conduction band defect models are considered in this analysis. The role that the different types of optical transitions play in shaping the corresponding optical response are also closely examined. Using the derived models, the spectral dependence of the optical absorption coefficient is compared with that of experiment for defect absorption influenced samples of amorphous silicon. The fits of these models with the results of experiment are found to be satisfactory.
Optimum non-linear design of active microwave mixers
Creators: name: Giannini, Franco
name: Leuzzi, Giorgio
name: Limiti, Ernesto
name: Morgia, Fabio
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: The optimum design of active microwave mixers is addressed by means of a full non-linear technique.Optimum matching conditions at the input/output ports and at all other ports are defined;a stable conversion gain is also defined ensuring high gain within safe stability margins in large-signal operating conditions.
Constraints on Neutrino Mass and Light Degrees of Freedom in Extended Cosmological Parameter Spaces
Creators: name: Joudaki, Shahab
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: From a combination of probes including the cosmic microwave background (WMAP7+SPT), Hubble constant (HST), baryon acoustic oscillations (SDSS+2dFGRS), and supernova distances (Union2), we have explored the extent to which the constraints on the effective number of neutrinos and sum of neutrino masses are affected by our ignorance of other cosmological parameters, including the curvature of the universe, running of the spectral index, primordial helium abundance, evolving late-time dark energy, and early dark energy. In a combined analysis of the effective number of neutrinos and sum of neutrino masses, we find mild (2.2 sigma) preference for additional light degrees of freedom. However, the effective number of neutrinos is consistent with the canonical expectation of 3 massive neutrinos and no extra relativistic species to within 1 sigma when allowing for evolving dark energy and relaxing the strong inflation prior on the curvature and running. The agreement improves with the possibility of an early dark energy component, itself constrained to be less than 5% of the critical density (95% CL) in our expanded parameter space. In extensions of the standard cosmological model, the derived amplitude of linear matter fluctuations sigma_8 is found to closely agree with low-redshift cluster abundance measurements. The sum of neutrino masses is robust to assumptions of the effective number of neutrinos, late-time dark energy, curvature, and running at the level of 1.2 eV (95% CL). The upper bound degrades to 2.0 eV (95% CL) when further including the early dark energy density and primordial helium abundance as additional free parameters. Even in extended cosmological parameter spaces, Planck alone could determine the possible existence of extra relativistic species at 4 sigma confidence and constrain the sum of neutrino masses to 0.2 eV (68% CL).
description: 14 pages, 4 figures. Minor refinements, reflects version accepted for publication in PRD (slow to get the paper published because of sickness)
MM-wave on-wafer characterization of electro-optic devices: a new, simple approach
Creators: name: Ferrero, A.
name: Ghione, G.
name: Mantione, F.
name: Nespola, A.
name: Pensa, S.
name: Pirola, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A new simple experimental set-up both for on-wafer and in-package electrical and electro-optic characterization of electro-optic devices up to 40 GHz is presented. The technique makes only use of a conventional network vector analyzer (NVA) and of a calibrated high-speed photodetector. The electro-optic transmission coefficient is simply deembedded from the electrical S21 using the detector calibrated responsivity. The RF calibration of the set-up implements the RSOL technique. The results obtained are shown to be comparable with the ones given by commercially available instrumentation, both in terms of accuracy and repeatability. The frequency bandwidth is only determined by the NVA bandwidth provided that the photodetector RF output is well above the NVA noise floor. Firstly some comparison with commercially available instrumentation up to 40 GHz on in-package device will be shown to validate the technique, after that, results concerning both in-package and on-wafer devices up to 40 GHz will be reported.
Possession
Creators: name: Lasky, Max
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: English literature
subject: Poetry

description: Possession is a collection of poems that work to formulate a philosophy of difference; that is, these poems explore the similarities between self and Other, and from those similarities arise an understanding of difference, an understanding that is ultimately affirmative. The first love prepares for the last, and so these poems begin with the loss of love and culminate, by the end, with the regaining of love. From New Jersey to Maryland, these poems explore place and the ecological, societal, and political contexts that inform our experience of place. Recurring threads that underlie this collection include addiction, mental illness, friendship, familial relations, and the interconnectedness between these threads, how they both inform, and escape, one another.
Dioscorea marginata Griseb.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Dioscoreales
Dioscoreaceae
Dioscorea
Dioscorea marginata

description: 41. Dioscorea marginata Griseb. in Mart.
Brazil (Amazonas, Pernambuco, Distrito Federal, Mato-Grosso do Sul).
Selected Voucher:—Zambana, Alves-Araújo et al. 625 (UFP), Albuquerque 588 (IPA).
EUPHORBIACEAE
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
On the material structure of hydrogenated nanocrystalline silicon
Creators: name: Schmidt, Kathrin Jessica
Publisher: name: University of British Columbia
Year: 2014

description: The dependence of the crystalline volume fraction on the mean crystallite size, for three hydrogenated nanocrystalline silicon-based photovoltaic solar cells, is examined. For each photovoltaic solar cell considered, X-ray diffraction and Raman spectra are determined. Through the application of Scherrer's equation, the X-ray diffraction results are used in order to determine the corresponding mean crystallite sizes. Through peak decomposition, the Raman results are used in order to estimate the corresponding crystalline volume fraction. By plotting the crystalline volume fraction as a function of the mean crystallite size, it is found that larger mean crystallite sizes tend to favor reduced crystalline volume fractions. The ability to randomly pack smaller crystallites with a greater packing fraction than their larger counterparts is suggested as a possible explanation for this observation.
Heat transfer modelling of a supercapacitor stack
Creators: name: Zhao, Ran
Publisher: name: Macquarie University
Year: 2022
Subjects: classificationCode: 399999
subject: Other education not elsewhere classified

description: Supercapacitors, also known as ultracapacitors, electrochemical capacitors or electrical double-layer capacitors (DEC), are novel energy storage devices which operate between capacitors and batteries with respect to power performance and energy storage. Supercapacitor stacks have a wide range of industrial applications., such as temporary power storage devices in electric vehicles or energy sources to reduce strains on batteries. Since a single supercapacitor cell can only produce a relatively low maximal operating voltage, it is common to connect a large number of individual supercapacitors in series to achieve the power requirement which has been called a supercapacitor stack. Since the supercapacitor stack may operate under critical condition in industrial and commercial environments, the cooling strategy and cell arrangement has a significant impact on the operation temperature of individual capacitors within the stack. THis thesis simulates the thermal model supercapacitor stacks with different air flow rates and cell arrangements by applying the lumped element model method. It is hoped this project will provide a better cell arrangement which has better cooling effects for the supercapacitor stack.
Balanced Electroabsorption Modulator for High-Linearity, Low-Noise Microwave Analog Optical Link
Creators: name: Cappelluti, F.
name: Mathai, S.
name: Wu, M.C.
name: Ghione, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: The paper presents a new device for analog optical links, the balanced electroabsorption modulator, to allow the simultaneous cancellation of laser relative intensity noise, all even-order distortions, and third order intermodulation. The RF photonic link employing the new balanced modulator shows great improvement in the overall link performance with respect to conventional links using a single electroabsorption modulator. Moreover, it favorably compares with the to date highest performance links employing lithium niobate cross-coupled Mach-Zehnder modulators, proving itself an enabling technology for placement of all-semiconductor radio-frequency lightwave transmitters in high performance analog fiber optic links.
Determining Available Safe Egress Time Using a Variable Fractional Effective Dosage Analysis of Heat and Asphyxiant Gases In Single-Story Occupancies
Creators: name: Donlin, Kathryn Louise
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Engineering

description: The objective of this project is to determine available safe egress time in a single-story occupancy using a fractional effective dosage analysis with variable exposure for fast and slow growth fire scenarios. Required safe egress time was calculated using smoke alarm activation times from single-story residence fires in conjunction with human behavior and movement data for walking and crawling. Available safe egress time was calculated using a fractional effective dosage analysis with temperature and heat flux measurements as well as CO, CO$_{2}$, and O$_{2}$ concentrations throughout the structure. The two time quantities were compared to determine if safe egress was possible. Egress was possible in all scenarios where a smoke alarm alerted quickly. When egress was dependent on a smoke alarm located behind a closed bedroom door, egress was not possible for all fast growth fires and unlikely in most slow growth fires. However, the benefit of sheltering behind a closed door was significant when compared to an occupant's exposure without a bedroom door. This project shows the need for the installation of multiple smoke alarms within a structure.
Direct digital modulation introduced via optically-controlled GAPS in active MMIC on GaAs.
Creators: name: Merrar, A.
name: Deshours, F.
name: Algani, C.
name: Nardini, C.
name: Alquié, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: An application of optically controlled gap integrated in an active MMIC is presented.The gap,inserted in a feedback amplifier,can optically modulate the active device.This topology could reduce the design complexity of digital wireless communication systems.
Non-linear Realizations, Goldstone bosons of broken Lorentz rotations and effective actions for p-branes
Creators: name: Gomis, Joaquim
name: Kamimura, Kiyoshi
name: Pons, Josep M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the non-linear realizations of the Poincare group for p-branes with local subgroup SO(1,p)*SO(D-(p+1)). The Nambu-Goto p-brane action is constructed using the Maurer Cartan forms of the unbroken translations. We perform a throughout phase space analysis of the action and show that it leads to the canonical action of a p-brane. We also construct some higher order derivative terms of the effective p-brane action using the MC forms of the broken Lorentz transformations.
description: 33 pages, no figure, comments and references added
An ultra-high switching frequency step-down DC-DC converter based on Gallium Arsenide devices
Creators: name: Gaye, M.
name: Ajram, S.
name: Maynadier, P.
name: Salmer, G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A 50MHz to 100MHz dc-dc power converter using Gallium Arsenide power switches is studied. GaAs Schottky rectifiers with high breakdown voltage and very small Ron x Con switching quality factor have been fabricated. A 10V to 5V (or 8V) prototype with an output power of 2.6 Watts and a power efficiency of 77% has been reported.
Remembering Bailey, Space, and A Whole Lotta Movement(s) in Michelle Tyrene Johnson's The Green Duck Lounge
Creators: name: Moore, Zahria Imani
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Theater
subject: English literature
subject: Black history

description: “Remembering Bailey, Space, and a Whole Lotta Movement(s) in Michelle Tyrene Johnson’s The Green Duck Lounge” is a critical study of Michelle Tyrene Johnson’s stage play, The Green Duck Lounge, and the premiere production in February 2018 at the University of Missouri. Through my scholarly analysis of the stage play (that is, through a dramatic analysis of the script, two oral histories, and an embodied written reflection remembering the premiere performance), this thesis explores the overarching question: How does Green Duck utilize Black feminist orality to theatrically emphasize Black women’s contributions to contemporary movements like the people for #BlackLivesMatter? By engaging Green Duck as a commemorative project, this thesis examines the ways in which Green Duck challenges how we remember Black resistance by telling history using a Black woman’s body (that is, Bailey).
The HI Content of Local Late-Type Galaxies
Creators: name: Evoli, Carmelo
name: Salucci, Paolo
name: Lapi, Andrea
name: Danese, Luigi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a solid relationship between the neutral hydrogen (HI) disk mass and the stellar disk mass of late-type galaxies in the local universe. This relationship is derived by comparing the stellar disk mass function from the Sloan Digital Sky Survey and the HI mass function from the HI Parkes All Sky Survey (HIPASS). We find that the HI mass in late-type galaxies tightly correlates with the stellar mass over three orders of magnitude in stellar disk mass. We cross-check our result with that obtained from a sample of HIPASS objects for which the stellar mass has been obtained by inner kinematics. In addition, we derive the HI versus halo mass relationship and the dependence of all the baryonic components in spirals on the host halo mass. These relationships bear the imprint of the processes ruling galaxy formation, and highlight the inefficiency of galaxies both in forming stars and in retaining their pristine HI gas.
description: 6 pages, 5 figures. Match to the published version. References updated
Digital Circuits in a Multi-Functional SAGFET MMIC Technology
Creators: name: Casu, M.R.
name: Lanzieri, C.
name: Masera, G.
name: Piccinini, G.
name: Zamboni, M.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: In this paper a possible implementation of digital circuits in a MMIC SAGFET/SAGHEMT technology is described. This technology has been developed at the Alenia Marconi Systems (AMS) and it is well suited for the integration of digital and microwave parts in the same GaAs substrate. A test circuit with FET’s for DC/AC characterization, inverter chains, ring oscillators and frequency dividers has been designed and is now under fabrication at AMS. Since now only Depletion MESFET transistors were available. However, the technology is still growing and in the near future Enhancement and Depletion MESFET and HEMT transistors will allow the implementation of E/D logic circuits.
Persistency of financial distress amongst Italian households: evidence from dynamic probit models
Creators: name: Giarda, Elena
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2011
Subjects: SECS-S/03 Statistica economica

description: This paper analyses financial distress among Italian households using the longitudinal component of the Bank of Italy Survey on Household Income and Wealth (SHIW) for the period 1998-2006. It aims to test whether the probability of experiencing financial difficulties is persistent over time. 
First we review the methodologies for estimating dynamic nonlinear panel data models, drawing attention to the problems to be dealt with to obtain consistent estimators. Specific attention is given to the initial condition problem introduced by the presence of the lagged dependent variable in the set of explanatory variables. 
Second we provide an in-depth discussion of the alternative approaches proposed in the literature - subjective/qualitative versus quantitative indicators - to identify households in financial distress. We define a quantitative measure of financial distress based on the distribution of net wealth. 
Finally we apply dynamic probit models to test for true state dependence in financial distress. The estimation uses four different methods: the pooled probit; the random effects probit with exogenous initial conditions; the Heckman model; and the more recent Wooldridge model. The results of all the estimators confirm the null hypothesis of true state dependence and show that, in line with the literature, less sophisticated models, namely pooled and exogenous models, tend to over-estimate this persistence.
Untersuchungen zum Einfluß freier Fettsäuren auf in vitro kultivierte humane Keratinozyten
Creators: name: Fröde, Dirk
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 1998
Subjects: Elektronische Publikation

description: Freie Fettsäuren sind bekannt für ihre toxischen Effekte an lebenden Zellen. Das Ziel unserer Untersuchungen ist die Erfassung der Wirkung freier Fettsäuren auf die intrazelluläre Calciumkonzentration von Keratinozyten sowie ihrer Wirkung hinsichtlich des Zelltodes. Es konnte gezeigt werden, daß hohe Konzentrationen von Linolsäure (500-5000 µM) innerhalb von Minuten zu einem kurz anhaltenden steilen Anstieg der freien Ca2+-Konzentration führt. Geringe Konzentrationen von freier Fettsäure (z.B.: Linolsäure, gamma-Linolensäure und Arachidonsäure) führten zu einem Anstieg des freien intrazellulären [Ca2+]i-Gehalts über einige Minuten. Im Einklang mit diesen Ergebnissen stehen die Befunde der nach 24h gemessenen Apoptose, die durch die Fettsäuren induziert wurde. Zum Nachweis der Apoptose dienten der Annexin-V-FITC und der Cell Death Detection ELISA -Test (beide von Boehringer Mannheim). Es konnte gezeigt werden, daß Fettsäuren in geringen Konzentrationen (bis ca. 50µM; außer gamma-Linolensäure 20µM und Arachidonsäure 30µM) toleriert werden, aber auch hier schon zu vermehrter Apoptose führen. Ist eine minimale Schwellkonzentration überschritten gehen die Zellen unweigerlich in die Apoptose über.
description: Free fatty acids are known for their toxic effects on living cells. The aim of our examinations is the recording of the effect of free fatty acids on the intracellular calcium concentration and the induction of cell death of keratinocytes. It could be shown, that high concentrations of linoleic acid (500-5000 µM) lead within minutes for a distinct rise of the free Ca2+-concentration for a short time. Low concentrations of free fatty acid (e.g. linoleic acid, gamma-linolenic acid and arachidonic acid) led to a continuous increase of the free intracellular [Ca2+]i-content over several minutes. The result that apoptosis occured after adding of fatty acids is probably related to these findings. Annexin-V-FITC and the Cell Death Detection Elisa Test (both Boehringer Mannheim) was used to prove apoptosis. It could be shown, that low concentrations of free fatty acids (linoleic acid up to 50µM, gamma-linolenic acid up to 20µM, arachidonic acid up to 30µM) are tolerated by most keratinocytes, but a minor proportion showed apoptosis too. If a minimal threshold of the concentration is exceeded, the cells are subjected to apoptosis.
Bendings by finitely additive transverse cocycles
Creators: name: Šarić, Dragomir
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Let $S$ be any closed hyperbolic surface and let $λ$ be a maximal geodesic lamination on $S$. The amount of bending of an abstract pleated surface (homeomorphic to $S$) with the pleating locus $λ$ is completely determined by an $(\mathbb{R}/2π\mathbb{Z})$-valued finitely additive transverse cocycle $β$ to the geodesic lamination $λ$. We give a sufficient condition on $β$ such that the corresponding pleating map $\tilde{f}_β:\mathbb{H}^2\to\mathbb{H}^3$ induces a quasiFuchsian representation of the surface group $π_1(S)$. Our condition is genus independent.
description: 34 pages, 4 figures, extra explanations added, same theorems
Dalechampia brasiliensis Lam.
Creators: name: Araújo, Diogo
name: Alves, Marccus
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Malpighiales
Euphorbiaceae
Dalechampia
Dalechampia brasiliensis

description: 42. Dalechampia brasiliensis Lam. (Fig. 4F)
Brazil (Pernambuco, Rio de Janeiro). Atlantic forest. (Govaerts et al. 2000).
Selected Vouchers:—Piedade, 22 March 2007, Alves-Araújo et al. 201 (IPA, 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 18, DOI: 10.11646/phytotaxa.8.1.1, http://zenodo.org/record/4893863
Beiträge zur Stabilität, Faltung und strukturellen Integrität von Proteinen
Creators: name: Golbik, Ralph
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2005
Subjects: subject: Elektronische Publikation
subject: 572.633

description: Der Prozess der Proteinfaltung im mechanistischen Detail ist eines der noch ungelösten Probleme der biologischen Wissenschaften. Es sind verschiedene Modelle vorgeschlagen worden, wie eine entfaltete Polypeptidkette ihre native, gefaltete Struktur findet. Die Thermodynamik und Kinetik der Faltung werden für das kleine Eindomänenprotein Barstar C40A/C82A/P27A (Barstar pseudo-Wildtyp), eine hergestellte Variante des intrazellulären Inhibitors der extrazellulären Ribonuklease Barnase, gezeigt. Der Zeitverlauf der Konformationsfaltung von Barstar wird auf der Grundlage der Faltungskinetik evaluiert. Die Isomerisierung einer cis-Prolylbindung als Teil des Faltungsprozesses wird mitels Doppelsprungtechnik untersucht und durch Peptidyl-prolyl-cis/trans-isomerasen als Faltungskatalysatoren bewiesen. Barstar pseudo-Wildtyp kann unter bestimmten Bedingungen Fibrillen bilden. Die Thermodynamik und Kinetik der Faltung der apikalen Domäne des Chaperonins GroEL wird beschrieben. Varianten dieser Domäne werden als Minichaperone bezeichnet und für biotechnologische Zwecke genutzt. Kollagen IV ist Teil der Basalmembran der Haut und ein netzwerkbildendes Protein. Es enthält einen Disulfidknoten als Bindungsstelle für einige Integrine, der eine höhere thermodynamische Stabilität im Vergleich zum restlichen Teil des Moleküls zeigt.
description: The process of protein folding in mechanistic detail is one of the still unsolved problems in biological sciences. Several models have been proposed for an unfolded polypeptide chain in finding its native, folded structure. The thermodynamics and kinetics of folding are presented for the small single-domain protein barstar C40A/C82A/P27A (barstar pseudo-wildtype), a designed variant of the intracellular inhibitor of the extracellular ribonuclease barnase. The time course of the conformational folding of barstar is evaluated on the basis of folding kinetics. The isomerization of a cis-prolyl bond as part of the folding process is studied by double-jump kinetics and proven using peptidyl-prolyl cis/trans isomerases as folding catalysts. Barstar pseudo-wildtype is able to form fibrils under special conditions. The thermodynamics and kinetics of folding of the apical domain of the chaperonin GroEL is described. Variants of this domain are named minichaperones and used for biotechnological purposes. Collagen IV is part of the basement membrane in skin and a network forming protein. It contains a disulfide knot being the binding site for some integrins, which displays a higher thermodynamic stability in comparison to the residual part of the molecule.
The Effects of Tryptophan and Probiotic Treatment on Behavior and Production Parameters of Laying Hens
Creators: name: Bonilla Carrero, Paola Ivette
Publisher: name: Digital Repository at the University of Maryland
Year: 2021
Subjects: subject: Animal sciences
subject: Animal behavior
subject: Animal welfare
subject: poultry
subject: probiotics
subject: Tryptophan

description: Dietary supplementation can impact behavior expression through microorganism’s activity in the gut microbiome and influence productivity in animal husbandry. Adding supplements to production animals’ diet can impact behaviors and productivity via gut-brain axis activity. We investigated the effects of either probiotic or antibiotic supplementation in addition to the effects of additional tryptophan (Trp) on overall behavior and production parameters. White Leghorn chickens (n=12) were supplemented with six dietary treatments in a 2 x 3 factorial design: probiotics (1 x 109 CFU/L) or the antibiotic erythromycin (125 mg/L) in combination with either normal (0.16%) or high (0.48%) Trp in drinking water. Results indicate that probiotics with tryptophan increased locomotion (P = 0.04), social (P = 0.04), and eating behavior (P = 0.02). Antibiotics with tryptophan increased fat pad (P = 0.04) and heart weight (P = 0.04). Supplementation affected behavioral expression of normal, comfort, and pecking behavior, potentially impacted by metabolic competition at the level of the gut microbiome.
Bell's Theorem: Two Neglected Solutions
Creators: name: Vervoort, Louis
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Bell's theorem admits several interpretations or 'solutions', the standard interpretation being 'indeterminism', a next one 'nonlocality'. In this article two further solutions are investigated, termed here 'superdeterminism' and 'supercorrelation'. The former is especially interesting for philosophical reasons, if only because it is always rejected on the basis of extra-physical arguments. The latter, supercorrelation, will be studied here by investigating model systems that can mimic it, namely spin lattices. It is shown that in these systems the Bell inequality can be violated, even if they are local according to usual definitions. Violation of the Bell inequality is retraced to violation of 'measurement independence'. These results emphasize the importance of studying the premises of the Bell inequality in realistic systems.