cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
X-FAST (eXternally Fed AeroSpace Transportation): General Formulation And Analysis of a Take-Off Auxiliary Device
Creators: name: Ancarola, Biagio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2006

description: L’obiettivo principale della Tesi di Dottorato è stato quello di: definire le principali caratteristiche di sistema di un dispositivo di assistenza al decollo X-FAST (eXternally Fed AeroSpace Transportation), capace di alimentare esternamente un endoreattore nella primissima fase di volo (O(0-500 [m])).
Le metodologie sviluppate sono state teoriche, analitiche e numeriche. I modelli sviluppati sono stati implementati in ambienti Matlab e Simulink.
Nell’ambito della ricerca svolta sono state definite le prindipali caratteristiche di sistema di tale dispositivo ausiliario al decollo, sono stati definiti i modelli matematici per la valutazione del moto e quelli per la determinazione dei principali parametri di progetto. Inoltre, sono state svolte delle analisi parametriche al fine di comprendere i guadagni derivanti dall’impiego di X-FAST su sistemi di lancio di applicazione industriale; si sono determinati gli ordini di grandezza tipici dei principali parametri ingegneristici. Infine sono state identificate le principali aree critiche di progetto (e.g. carichi meccanici nel sistema di trasferimento di propellente, potenza, pressione nel sistema di pompaggio, etc.) rientrano in tipici range di utilizzo di applicazioni dell’ingegneria civile ed industriale.
I principali risultati ottenuti hanno messo in luce i rimarchevoli guadagni in prestazioni ottenibili mediante l’impiego del sistema X-FAST su sistemi di lancio. L’idea su cui si basa il sistema X-FAST è originale nella sua concezione e nel suo impiego. L’impiego di tale sistema può comportare una migliore dipendenza funzionale dei parametri di missione dai rapporti di massa. Tale ricerca ha suscitato interesse in un’ampia parte della comunità scientifica, istituzionale ed industriale coinvolta; in particolare, ma non solo, di vari gruppi di settore dell’Agenzia Spaziale Europea (ESA). In campo industriale sono immaginabili ricadute nel settore dei lanciatori tradizionali per la messa in orbita di micro-satelliti e piattaforme e nel settore dei missili balistici a breve, medio e lungo raggio. Inoltre sono auspicabili molteplici trasferimenti tecnologici sia nell’aviazione, per le potenziali applicazioni ad elicotteri ed aerei (sia a decollo orizzontale che verticale) che nell’industria civile e militare per quanto riguarda lo sviluppo di sottosistemi e tecnologie che ne possono derivare.
Finite-dimensional representation of the quadratic algebra of a generalized coagulation-decoagulation model
Creators: name: Jafarpour, Farhad H.
name: Aghamohammadi, Ali
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The steady-state of a generalized coagulation-decoagulation model on a one-dimensional lattice with reflecting boundaries is studied using a matrix-product approach. It is shown that the quadratic algebra of the model has a four-dimensional representation provided that some constraints on the microscopic reaction rates are fulfilled. The dynamics of a product shock measure with two shock fronts, generated by the Hamiltonian of this model, is also studied. It turns out that the shock fronts move on the lattice as two simple random walkers which repel each other provided that the same constraints on the microscopic reaction rates are satisfied.
description: Minor revisions
Uniform Mixing of Antiferromagnetism and High-Tc Superconductivity in Electron-doped Layers in Four-layered Ba2Ca3Cu4O8F2 : A New Phenomenon in an Electron Underdoped RegimePhenomenon in an Electron Underdoped Regime
Creators: name: Shimizu, S.
name: Mukuda, H.
name: Kitaoka, Y.
name: Iyo, A.
name: Tanaka, Y.
name: Kodama, Y.
name: Tokiwa, K.
name: Watanabe, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report Cu- and F-NMR studies on a four-layered high-temperature superconductor Ba2Ca3Cu4O8F2(0234F(2.0)) with apical fluorine (F-1), an undoped 55 K-superconductor with a nominal Cu2+ valence on average. We reveal that this compound exhibits the antiferromagnetism (AFM) with a Neel temperature TN=100 K despite being a Tc= 55 K-superconductor. Through a comparison with a related tri-layered cuprate Ba2Ca2Cu3O6F2 (0223F(2.0)), it is demonstrated that electrons are transferred from the inner plane (IP) to the outer plane (OP) in 0234F(2.0) and 0223F(2.0), confirming the self-doped high-temperature superconductivity (HTSC) having electron and hole doping in a single compound. Remarlably, uniform mixing of AFM and HTSC takes place in both the electron-doped OPs and the hole-doped IPs in 0234F(2.0).
description: 4 pages
Gli effetti dell'IRAP nel settore agricolo
Creators: name: Monda, Mafalda
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: L’introduzione dell’Imposta regionale sulle attività produttive nel 1998 e la contestuale abolizione di altri tributi ha inciso fortemente sul comportamento delle imprese, determinandone una modificazione significativa in risposta al nuovo regime fiscale.
L’IRAP, pur essendo comune a tutti i settori economici, viene introdotta in agricoltura in sostituzione di tributi prima non rilevanti, pertanto è indubbio che la sua entrata in vigore abbia determinato un aumento del prelievo tributario gravante sulle imprese. Inoltre la struttura assunta dal tributo in questo settore, per il quale la normativa stabilisce un trattamento differenziato rispetto alle altre attività produttive, rende complessa l’identificazione dei risultati economici connessi che, per questo, sono stati solo in parte indagati dalla letteratura. In tale contesto si inserisce il presente lavoro che si pone l’obiettivo specifico di approfondire gli effetti prodotti dall’IRAP, con particolare riguardo al ruolo rivestito dall'imposta sulla dinamica della formazione di capitale fisso in agricoltura. La metodologia adottata allo scopo si basa, in primo luogo, sulla costruzione di una serie di indicatori in grado di evidenziare l’impatto del tributo sia a livello regionale, in considerazione della sua caratteristica di tributo locale, che per tipologia giuridica di impresa, data la presenza di diversi regimi di determinazione dell’imponibile. In secondo luogo viene indagata l’incidenza del tributo sulle scelte di investimento delle imprese, attraverso la costruzione di un modello econometrico di domanda aggregata di investimenti. La formulazione di un modello di questo tipo rappresenta un fattore di assoluta novità, che permette l’esplorazione di un terreno nuovo di ricerca. Con tutti i limiti del caso, il lavoro vuole dare un contributo al dibattito esistente in materia, aggiungendo così un tassello ancora mancante all’indagine degli effetti economici connessi all’IRAP.
On the Performance of Dual-Gate Reconfigurable Nanowire Transistors
Creators: name: Sun, Bin
name: Richstein, Benjamin
name: Liebisch, Patrick
name: Frahm, Thorben
name: Scholz, Stefan
name: Trommer, Jens
name: Mikolajick, Thomas
name: Knoch, Joachim
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We investigate the operation of dual-gate reconfigurable field-effect transistor (RFET) in the programgate at drain (PGAD) and program-gate at source (PGAS) configurations. To this end, dual-gate silicon nanowire (SiNW) FETs are fabricated based on anisotropic wet chemical silicon etching and nickel silicidation yielding silicide-SiNW Schottky junctions at source and drain. Whereas in PGAD-configuration ambipolar operation is suppressed, switching is deteriorated due to the injection through a Schottky-barrier. Operating the RFET in PGAS configuration yields a switching behavior close to a conventional MOSFET. This, howewer, needs to be traded off against strongly non-linear output characteristics for small bias.
description: 5 pages
MAGIC J0616+225 as delayed TeV emission of cosmic-rays diffusing from SNR IC 443
Creators: name: Torres, Diego F.
name: Marrero, Ana Y. Rodriguez
name: del Pozo, Elsa de Cea
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a theoretical model that explains the high energy phenomenology of the neighborhood of SNR IC 443, as observed with the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescope and the Energetic Gamma-Ray Experiment Telescope (EGRET). We interpret MAGIC J0616+225 as delayed TeV emission of cosmic-rays diffusing from IC 443 and interacting with a known cloud located at a distance of about 20 pc in the foreground of the remnant. This scenario naturally explains the displacement between EGRET and MAGIC sources, their fluxes, and their spectra. We compare this model with others recently presented, and discuss how it can be tested with observations by the Gamma-ray Large Area Telescope (GLAST).
description: Accepted for publication in MNRAS Letters
Paraleuctra occidentalis
Creators: name: Baumann, Richard W.
name: Stark, Bill P.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Leuctridae
Paraleuctra
Paraleuctra occidentalis

description: Paraleuctra occidentalis (Banks) Leuctra occidentalis Banks, 1907:329. Lectotype ♀ (Museum of Comparative Zoology, Harvard University), Laggan, Alberta, designated by Ricker, 1952 Leuctra bradleyi Needham & Claassen, 1925:225. Holotype ♂, damaged (Cornell University), Emerald Lake, Canadian Rockies Material examined. Canada: Emerald Lake, Canadian Rockies, P. bradleyi holotype, abdomen lost (Cornell University). Alberta, Laggan, 22 July 1901, R. Osburn, lectotype ♀ (Museum of Comparative Zoology). Same location, 23 August 1902, R. Osburn, paralectotype ♀, abdomen lost (Museum of Comparative Zoology). Remarks. The female specimen in the MCZ which Ricker (1952) selected as lectotype was not labeled as such, but he indicates it is the “complete ♀ specimen” and by elimination, the specimen listed above must be the lectotype. The second MCZ specimen (paralectotype), collected at Laggan, “BC” on 23 August 1902 has no abdomen. We clipped the lectotype abdomen, cleared it and found it to be consistent with the figure of P. occidentalis (Fig. 32) provided by Stark & Kyzar (2000). We also accept the Ricker (1954) synonymy of P. bradleyi with P. occidentalis based on the figures provided by Needham & Claassen (1925) on Plate 41 of that publication.
description: Published as part of Baumann, Richard W. & Stark, Bill P., 2009, Paraleuctra Alta (Plecoptera: Leuctridae), A New Stonefly From Alberta, Canada, pp. 30-33 in Illiesia 5 (4) on page 32, DOI: 10.5281/zenodo.4759464
description: {"references": ["Banks, N. 1907. A list of Perlidae from British Columbia and Alberta. The Canadian Entomologist, 39: 325 - 330.", "Ricker, W. E. 1952. Systematic studies in Plecoptera. Indiana University Publications, Science Series 18. Indiana University Press, Bloomington. 200 pp.", "Stark, B. P. & J. W. Kyzar. 2000. Systematics of Nearctic Paraleuctra with description of a new genus (Plecoptera: Leuctridae). Tijdschrift voor Entomologie, 144: 119 - 135.", "Ricker, W. E. 1954. Nomenclatorial notes on Plecoptera. Proceedings of the Entomological Society of British Columbia, 51: 37 - 39."]}
THE GENETIC BASIS OF  PRIMARY ADULT-ONSET  DYSTONIA
Creators: name: Esposito, Marcello
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Objectives. To identify novel genetic loci associated with primary adult-onset dystonia (AOD) and assess candidate genes from the literature.
Secondary aimes. Epidemiological studies: to identify the rate of family history in people affeceted by AOD in Italy and to assess the impact of enviromental factors and clinical features between sporadic and familial cases.
Background/rationale. Primary AOD has variable clinical expression as blepharospasm, oromandibular dystonia, cervical dystonia, laryngeal dystonia and arm dystonia. It usually starts after the age of twenty, has a peak age incidence between the 5th and the 7th decade, and predominates in women. Prevalence estimates vary widely across studies, but crude rates between 430 and 2250 cases  per million are probably close to the true prevalence of  the condition. AOD can be highly disabling and carry social and financial costs. Primary adult-onset dystonia is assumed to be partly genetic due to its aggregation within families and the identification of specific genetic loci including DYT 1, 2, 4, 6, 7, 13, 16, 17. Linkage to these loci  is rare and accounts only for a small fraction of patients with adult-onset dystonia. Hence the gene(s) that lend risk to commonly occurring adult-onset primary dystonia are not known.
Description of the project. The present project combines the clinical and genetic expertise of 9 leading Italian movement disorders centers. Data were collected from  a wide, representative Italian sample of patients with AOD and their first degree relatives. Genetic factors will  be studied by the affected sibling pair method (ASP) that allows identification of novel disease associated-loci, and also offers the potential to study candidate gene from the literature.
ARTchives: a data-driven historiography of art history. Repository
Creators: name: Giagnolini, Lucia
Publisher: name: figshare
Year: 2021
Subjects: subject: Digital Humanities
subject: 80308 Programming Languages
subject: FOS: Computer and information sciences
subject: 190102 Art History
subject: FOS: Arts (arts, history of arts, performing arts, music)

description: Repository of the research carried out by Lucia Giagnolini for her master's thesis in Knowledge Organization and Cultural Heritage, Digital Humanities and Digital Knowledge international degree a. y. 2020/2021.
Generalized boosted additive models
Creators: name: Amodio, Sonia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Regression analysis is a central method of statistical data analysis, but it is often inappropriate to model the relationship between the conditional distribution of a dependent variable as a function of one or more predictors when this relationship is characterized by complex nonlinear patterns.
In such cases nonparametric regression methods are more suitable. Among nonparametric regression methods, generalized additive models have become very popular but they present a drawback when concurvity is present in the data.
Concurvity can be defined as the presence of nonlinear dependencies among transformations of the explanatory variables considered in the model and often it directly follows from the presence of collinearity among untransformed predictors. In the context of generalized additive models the presence of concurvity leads to biased estimates of the model parameters and of their standard errors.
For such reasons we focus on nonlinear categorical regression approach, applying the optimal scaling methodology as presented in the Gifi system. In the presence of collinearity among untransformed predictors, applying nonlinear transformations through optimal scaling implies that interdependence among these predictors decreases. Moreover, in the framework of nonlinear regression with optimal scaling we follow the approach proposed by Meulman (2003) of introducing in the model nonlinear prediction components, applying the basic idea of forward stagewise boosting procedure, with the aim of improving the prediction power of the model itself. We call this approach the Generalized Boosted Additive Model (GBAM).
A microprocessor-based 3-D anthropometer
Creators: name: Saunders, Carl G.
Publisher: name: University of British Columbia
Year: 2010

description: Three-dimensional measurement, in relation to the human form, is reviewed and a need is perceived for a workstation which is capable of gathering three-dimensional data around an object such as a limb. A new device is presented to fill this measurement niche. Incorporating an instrumented spatial linkage and a stand-alone microcomputer, the device is portable and programmable. Technical and clinical trials indicate its accuracy and working volume are appropriate for anthropometric applications. Cost is estimated to be comparable to that of commercially existing three-dimensional digitizers.
A Circulating Hydrogen Ultra-High Purification System for the MuCap Experiment
Creators: name: Ganzha, V. A.
name: Kravtsov, P. A.
name: Maev, O. E.
name: Schapkin, G. N.
name: Semenchuk, G. G.
name: Trofimov, V.
name: Vasilyev, A. A.
name: Vznuzdaev, M. E.
name: Clayton, S. M.
name: Kammel, P.
name: Kiburg, B.
name: Hildebrandt, M.
name: Petitjean, C.
name: Banks, T. I.
name: Lauss, B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The MuCap experiment is a high-precision measurement of the rate for the basic electroweak process of muon capture, mu- + p -> n + nu . The experimental approach is based on an active target consisting of a time projection chamber (TPC) operating with pure hydrogen gas. The hydrogen has to be kept extremely pure and at a stable pressure. A Circulating Hydrogen Ultrahigh Purification System was designed at the Petersburg Nuclear Physics Institute (PNPI) to continuously clean the hydrogen from impurities. The system is based on an adsorption cryopump to stimulate the hydrogen flow and on a cold adsorbent for the hydrogen cleaning. It was installed at the Paul Scherrer Institute (PSI) in 2004 and performed reliably during three experiment runs. During several months long operating periods the system maintained the hydrogen purity in the detector on the level of 20 ppb for moisture, which is the main contaminant, and of better than 7 ppb and 5 ppb for nitrogen and oxygen, respectively. The pressure inside the TPC was stabilized to within 0.024% of 10 bar at a hydrogen flow rate of 3 standard liters per minute.
description: submitted to Nucl. Instr. Methods Phys. Res. A
Spin-dependent empirical formula for the lowest excitation energies of the natural parity states in even-even nuclei
Creators: name: Jin, Guanghao
name: Cha, Dongwoo
name: Yoon, Jin-Hee
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We present an empirical expression which holds for the lowest excitation energy of the natural parity states in even-even nuclei throughout the entire periodic table. This formula contains spin-dependent factors so that it is applied to different multipole states with the same model parameters in contrast to the recently proposed empirical expression where the model parameters had to be fitted for each multipole separately.
description: 9 pages, 5 figures
I crostacei Anfipodi quali descrittori delle comunità bentoniche di ambienti marino costieri interessati da attività antropiche
Creators: name: Targusi, Monica
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: Il presente lavoro si propone di valutare la possibilità di utilizzare il taxon degli Anfipodi quale descrittore delle comunità bentoniche di aree costiere interessate da attività antropiche. A tal fine è stato analizzato il popolamento ad Anfipodi di aree costiere della Regione Marche, interessate da attività di ripascimento. In particolare, sono stati analizzati sia il popolamento macrozoobentonico generale (molluschi, policheti e crostacei) che il popolamento ad Anfipodi presente nell’area di studio prima e dopo le attività di ripascimento. I risultati ottenuti hanno permesso di evidenziare differenze significative nella struttura e composizione in specie del popolamento macrozoobentonico e del popolamento ad Anfipodi, prima e dopo le attività di ripascimento. Tali differenze sono state ricondotte alle variazioni delle caratteristiche chimico-fisiche dei sedimenti e alle caratteristiche biologiche ed ecologiche delle specie.
I risultati ottenuti dall’analisi del popolamento ad Anfipodi sono stati quindi confrontati con quanto osservato nelle stesse aree relativamente all’intera comunità bentonica. La coerenza osservata tra la struttura e la distribuzione dei popolamenti ha permesso di concludere che, in ambienti costieri interessati da attività antropiche, il taxon degli anfipodi si è rivelato un utile descrittore delle comunità bentoniche.
Remarks on cycle classes of sections of the arithmetic fundamental group
Creators: name: Esnault, Hélène
name: Wittenberg, Olivier
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 14F35 (Primary) 14C25, 14F20 (Secondary)

description: Given a smooth and separated K(pi,1) variety X over a field k, we associate a "cycle class" in etale cohomology with compact supports to any continuous section of the natural map from the arithmetic fundamental group of X to the absolute Galois group of k. We discuss the algebraicity of this class in the case of curves over p-adic fields, and deduce in particular a new proof of Stix's theorem according to which the index of a curve X over a p-adic field k must be a power of p as soon as the natural map from the arithmetic fundamental group of X to the absolute Galois group of k admits a section. Finally, an etale adaptation of Beilinson's geometrization of the pronilpotent completion of the topological fundamental group allows us to lift this cycle class in suitable cohomology groups.
description: 19 pages; final version (added MSC codes and keywords)
A graphical method of cumulative differences between two subpopulations
Creators: name: Tygert, Mark
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Comparing the differences in outcomes (that is, in "dependent variables") between two subpopulations is often most informative when comparing outcomes only for individuals from the subpopulations who are similar according to "independent variables." The independent variables are generally known as "scores," as in propensity scores for matching or as in the probabilities predicted by statistical or machine-learned models, for example. If the outcomes are discrete, then some averaging is necessary to reduce the noise arising from the outcomes varying randomly over those discrete values in the observed data. The traditional method of averaging is to bin the data according to the scores and plot the average outcome in each bin against the average score in the bin. However, such binning can be rather arbitrary and yet greatly impacts the interpretation of displayed deviation between the subpopulations and assessment of its statistical significance. Fortunately, such binning is entirely unnecessary in plots of cumulative differences and in the associated scalar summary metrics that are analogous to the workhorse statistics of comparing probability distributions -- those due to Kolmogorov and Smirnov and their refinements due to Kuiper. The present paper develops such cumulative methods for the common case in which no score of any member of the subpopulations being compared is exactly equal to the score of any other member of either subpopulation.
description: 26 pages, 15 figures, 2 tables. arXiv admin note: text overlap with arXiv:2008.01779
First passage times and distances along critical curves
Creators: name: Zoia, A.
name: Kantor, Y.
name: Kardar, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose a model for anomalous transport in inhomogeneous environments, such as fractured rocks, in which particles move only along pre-existing self-similar curves (cracks). The stochastic Loewner equation is used to efficiently generate such curves with tunable fractal dimension $d_f$. We numerically compute the probability of first passage (in length or time) from one point on the edge of the semi-infinite plane to any point on the semi-circle of radius $R$. The scaled probability distributions have a variance which increases with $d_f$, a non-monotonic skewness, and tails that decay faster than a simple exponential. The latter is in sharp contrast to predictions based on fractional dynamics and provides an experimental signature for our model.
description: 5 pages, 5 figures
Spin-2 KK Mode Scattering in Models with a Massive Radion
Creators: name: Chivukula, R. Sekhar
name: Foren, Dennis
name: Mohan, Kirtimaan A.
name: Sengupta, Dipan
name: Simmons, Elizabeth H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We calculate tree-level scattering amplitudes of massive spin-2 KK particles in models of stabilized compact extra-dimensional theories. Naively introducing a mass for the radion in an extra-dimensional model without accounting for the dynamics responsible for stabilizing the extra dimension upsets the cancellations relating the masses and couplings of the spin-2 modes, resulting in KK scattering amplitudes which grow like $E^{4}$ instead of $E^{2}$. We therefore investigate scattering of the Kaluza-Klein states in theories incorporating the Goldberger-Wise mechanism to stabilize the size of the extra dimension. We demonstrate that the cancellations occur only when one includes not only the massive radion, but also the massive spin-0 modes arising from the Goldberger-Wise scalar. We compute the revised sum rules which are satisfied in a stabilized model to ensure a consistent high-energy scattering amplitude. We introduce a simple model of a stabilized extra dimension which is a small deformation of a flat (toroidal) five-dimensional model, and demonstrate the cancellations in computations performed to leading nontrivial order in the deformation. These results are the first complete KK scattering computation in an extra-dimensional model with a stabilized extra dimension, with implications for the theory and phenomenology of these models.
description: 33 pages, 1 figure, 2 tables
Winds from clu\sters with non-uniform stellar distributions
Creators: name: Rodríguez-González, Ary
name: Cantó, J.
name: Esquivel, A.
name: Raga, A. C.
name: Velazquez, P. F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present analytic and numerical models of the `cluster wind' resulting from the multiple interactions of the winds ejected by the stars of a dense cluster of massive stars. We consider the case in which the distribution of stars (i.e., the number of stars per unit volume) within the cluster is spherically symmetric, has a power-law radial dependence, and drops discontinuously to zero at the outer radius of the cluster. We carry out comparisons between an analytic model (in which the stars are considered in terms of a spatially continuous injection of mass and energy) and 3D gasdynamic simulations (in which we include 100 stars with identical winds, located in 3D space by statistically sampling the stellar distribution function). From the analytic model, we find that for stellar distributions with steep enough radial dependencies the cluster wind flow develops a very high central density and a non-zero central velocity, and for steeper dependencies it becomes fully supersonic throughout the volume of the cluster (these properties are partially reproduced by the 3D numerical simulations). Therefore, the wind solutions obtained for stratified clusters can differ dramatically from the case of a homogeneous stellar distribution (which produces a cluster wind with zero central velocity, and a fully subsonic flow within the cluster radius). Finally, from our numerical simulations we compute predictions of X-ray emission maps and luminosities, which can be directly compared with observations of cluster wind flows.
description: 10 pages, 11 figures. MNRAS - Accepted 2007 June 29. Received 2007 June 28; in original form 2007 May 23
MOLECULAR ANALYSIS OF PHENYLALANINE HYDROXYLASE GENE IN SOUTH ITALY PATIENTS AFFECTED BY PHENYLKETONURIA
Creators: name: Palmieri, Alessia
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: Hyperphenylalaninemias  (HPAs),  the  most  common inborn error of metabolism (1:10.000), is recessively inherited and caused by mutations in the gene encoding phenylalanine hydroxylase (PAH). PAH converts L- Phenylalanine into L-Tyrosine. PAH block results in accumulation of L-Phe and toxic metabolites. HPAs is classified according Phe serum levels as: 1.Classical PKU
2.Mild PKU 3.Mild HPA.
PAH gene, located on chromosome 12, is composed of 171
Kb  and  13  exons.  To  date  more  than  600  causative mutations for PKU are described in the entire PAH gene:
62% are missense mutations; 14% deletions; 11% splice site mutations; 6% nonsense mutations; 2% insertions.
PAH, hepatic monooxygenase of 452 amino acids that catalyzes conversion of L-Phe to L-Tyr using 6R-l-erythro-
5,6,7,8-tetrahydrobiopterin (BH4) and molecular oxygen. PAH consists of three structural domains: 1.N-term regulatory domain 2.Large catalytic domain 3.C-term tetramerization domain.
HPA is also the first metabolic disorder in which treatment (a Phe-restricted diet) was found to prevent clinical symptoms. The aim of my thesis was to perform molecular analysis of the PAH gene in 390 PKU patients and 373 carriers from the Campania Region Screening Center. The analysis of PAH mutations allowed to define the molecular epidemiology of PAH gene in Campania and compare the obtained data with those from other regions of Italy. The analysis of the PAH gene have been performed through the extraction of genomic DNA from peripheral blood, followed by amplification and direct sequencing of the entire gene.
In the last phase of the study, we optimized and validated a next generation sequencing protocol for the analysis of the entire PAH gene sequence, including introns and regulatory regions to identify PKU causative mutations in patients negative.
In conclusion, our study, has allowed us to define: - molecular diagnosis of HPA patients achieving a detection rate of 98.8%, - epidemiology of mutations in PAH gene of patients from Campania, - the residual risk to be carriers, and  prenatal diagnosis  in  PKU  family,  -  the responsiveness of BH4 in PKU patients, - good correlation between mutations and phenotypes of the disease.
These data may help to reconstruct the historical and anthropological point of view, the various settlements that have occurred in our country.
Terapia mininvasiva della calcolosi dell'uretere distale: confronto tra litotrissia extracorporea ed ureterolitotrissia endoscopica
Creators: name: Creta, Massimiliano
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: L’obiettivo del presente studio è confrontare la litotrissia extracorporea con onde d'urto (ESWL) e l’ureteroscopia (URS) come strategie di prima linea nel trattamento della calcolosi dell’uretere distale in pazienti con indicazione alla rimozione attiva del calcolo. Da Marzo 2009 a Luglio 2012 abbiamo condotto uno studio clinico prospettico comparativo non randomizzato su di un campione di pazienti affetti da calcolosi dell’uretere distale. Centoventi pazienti sono stati trattati mediante ESWL ed altrettanti mediante URS. L’ESWL eseguita mediante litotritore elettromagnetico e l’URS eseguita mediante uretroscopio semirigido di piccolo calibro offrono risultati sovrapponibili in caso di calcolosi dell’uretere distale in termini di percentuali di pazienti liberi da calcoli e di incidenza di complicanze. L’ESWL offre il vantaggio di poter essere eseguita senza dover ricorrere ad anestesia generale o loco regionale. Essa richiede, rispetto all’URS, un numero di ritrattamenti significativamente maggiore.
Ruolo degli aspetti morfologici e metabolici nella diagnosi differenziale tra patologie benigne e maligne della milza
Creators: name: Segreto, Sabrina
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: E' stato valutato il ruolo di dispositivi tomografici TC e PET/TC di nuova generazione nella diagnosi differenziale delle patologie spleniche benigne e maligne, usando l’esame cito/istologico come standard di riferimento.
Nello specifico, lo scopo dello studio è stato di:
1) definire gli aspetti della TC e PET/TC capaci di differenziare le patologie spleniche benigne dalle maligne;
2) valutare se la PET/TC aggiunge informazioni addizionali ai risultati della TC.
A framework for threat recognition in physical security information management
Creators: name: Pappalardo, Alfio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2013

description: In modern society, the capability to ensure an adequate level of security to persons and infrastructures is essential for the development of a territory. Malicious acts as well as adverse natural events can pose a threat to the physical security. Whatever the application domain, the protection of complex, extended and critical environments requires the development of innovative approaches to the security. They must aim at recognizing threats scenarios as early as possible, providing superior situation awareness and decision support, in order to activate a quick and focused response. The research presented in this thesis addresses that issue, on different levels. At a methodological level, by defining a general paradigm of “augmented surveillance”, thanks to information fusion strategies. At the application level, by developing a framework aimed at the automatic and early detection of threat scenarios, thanks to a model-based logical, spatial and temporal correlation of events. In order to improve the detection effectiveness and efficiency, the work introduces a heuristic situation recognition, based on ad-hoc distance metrics; and a real-time trustworthiness evaluation of the detected threat scenarios, based on uncertainty parameters characterizing sensors and models. Finally the thesis includes the application of those techniques to railway and mass-transit domain and the overall integration of the framework with an existing PSIM system.
Density of States of the lattice Schwinger model
Creators: name: Papaefstathiou, Irene
name: Robaina, Daniel
name: Cirac, J. Ignacio
name: Bañuls, Mari Carmen
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using a recently introduced tensor network method, we study the density of states of the lattice Schwinger model, a standard testbench for lattice gauge theory numerical techniques, but also the object of recent experimental quantum simulations. We identify regimes of parameters where the spectrum appears to be symmetric and displays the expected continuum properties even for finite lattice spacing and number of sites. However, we find that for moderate system sizes and lattice spacing of $ga\sim O(1)$, the spectral density can exhibit very different properties with a highly asymmetric form. We also explore how the method can be exploited to extract thermodynamic quantities.
description: 10 pages, 5 figures
title: The influence of magnetic field on nanoparticle transport in a micro channel
Creators: name: Bavandi, Mahrokh
name: Wünsch, Olaf
Publisher: name: Universität Kassel
Year: 2021
Subjects: subject: 530
subject: 600
subject: Magnetfeld
subject: Nanopartikel
subject: Mikrofluidik

description: Gefördert im Rahmen des Projekts DEAL
An Integrated Deep Learning and Dynamic Programming Method for Predicting Tumor Suppressor Genes, Oncogenes, and Fusion from PDB Structures
Creators: name: Anandanadarajah, Nishanth.
name: Chu, C. H.
name: Loganantharaj, R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Image and Video Processing (eess.IV)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Biological sciences

description: Mutations in proto-oncogenes (ONGO) and the loss of regulatory function of tumor suppression genes (TSG) are the common underlying mechanism for uncontrolled tumor growth. While cancer is a heterogeneous complex of distinct diseases, finding the potentiality of the genes related functionality to ONGO or TSG through computational studies can help develop drugs that target the disease. This paper proposes a classification method that starts with a preprocessing stage to extract the feature map sets from the input 3D protein structural information. The next stage is a deep convolutional neural network stage (DCNN) that outputs the probability of functional classification of genes. We explored and tested two approaches: in Approach 1, all filtered and cleaned 3D-protein-structures (PDB) are pooled together, whereas in Approach 2, the primary structures and their corresponding PDBs are separated according to the genes' primary structural information. Following the DCNN stage, a dynamic programming-based method is used to determine the final prediction of the primary structures' functionality. We validated our proposed method using the COSMIC online database. For the ONGO vs TSG classification problem, the AUROC of the DCNN stage for Approach 1 and Approach 2 DCNN are 0.978 and 0.765, respectively. The AUROCs of the final genes' primary structure functionality classification for Approach 1 and Approach 2 are 0.989, and 0.879, respectively. For comparison, the current state-of-the-art reported AUROC is 0.924.
Consent Form: Health4Kids
Creators: name: Parra-Medina, Deborah
Publisher: name: The University of Texas at Austin
Year: 2017
Subjects: Latino
urban
family-focused
development
obesity prevention
nutrition
physical activity
mhealth
Health4Kids

description: National Institute of Diabetes and Digestive and Kidney Disorders
description: Health4Kids is an obesity management program that uses family counseling, text messages, and newsletters to encourage healthier eating and increased physical activity in overweight and obese Latino children in San Antonio, Texas. Through pediatric clinics at the University Health System, researchers will work with child-parent pairs to test and evaluate the efficacy of intervention strategies including family counseling (in-clinic and phone) and culturally tailored text messages and newsletters. The research team will measure the impact of the program on body composition, insulin, glucose and cholesterol levels, and on health behavior changes like physical activity and fruit and vegetable consumption.
Reducing the positional modulation of NbO6-octahedra in SrxBa1-xNb2O6 by increasing the Barium content: A single crystal neutron diffraction study at ambient temperature for x=0.61 and x=0.34
Creators: name: Schefer, J.
name: Schaniel, D.
name: Petricek, V.
name: Woike, Th.
name: Cousson, A.
name: Woehlecke, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on the influence of the Barium content on the modulation amplitude in SrxBa1-xNb2O6 compounds by comparing Sr0.61Ba0.39Nb2O6 (SBN61) and Sr0.34Ba0.66Nb2O6 (SBN34). Our single crystal neutron diffraction results demonstrate that the amplitude of the positional modulation of the NbO6 octahedra is reduced with increasing barium content, indicating that the origin of the modulation is the partial occupation of the pentagonal channels by Sr and Ba atoms. By increasing the Sr content the bigger Ba atoms are replaced by the smaller Sr atoms, which leads to a larger deformation of the surrounding lattice and hence to a larger modulation amplitude. The more homogeneous the filling of these channels with one atomic type (Ba) the lower the modulation amplitude. Our results also show that the structure can be described with a two-dimensional incommensurate harmonic modulation. No second order modulation has been observed, both by single crystal diffraction measurements and q-scans. The positional modulation of the Nb atoms is much smaller than that of the oxygen atoms, such that the modulation can be seen as a rotational modulation of almost rigid NbO6-octahedra.
Statistical significance of rich-club phenomena in complex networks
Creators: name: Jiang, Zhi-Qiang
name: Zhou, Wei-Xing
Publisher: name: arXiv
Year: 2007
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: We propose that the rich-club phenomena in complex networks should be defined in the spirit of bootstrapping, in which a null model is adopted to assess the statistical significance of the rich-club detected. Our method can be served as a definition of rich-club phenomenon and is applied to analyzing three real networks and three model networks. The results improve significantly compared with previously reported results. We report a dilemma with an exceptional example, showing that there does not exist an omnipotent definition for the rich-club phenomenon.
description: 3 Revtex pages + 5 figures
Suzaku observation of TeV blazar the 1ES 1218+304: clues on particle acceleration in an extreme TeV blazar
Creators: name: Sato, R.
name: Kataoka, J.
name: Takahashi, T.
name: Madejski, G. M.
name: Rugamer, S.
name: Wagner, S. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We observed the TeV blazar 1ES 1218+304 with the X-ray astronomy satellite Suzaku in May 2006. At the beginning of the two-day continuous observation, we detected a large flare in which the 5-10 keV flux changed by a factor of ~2 on a timescale of 5x10^4 s. During the flare, the increase in the hard X-ray flux clearly lagged behind that observed in the soft X-rays, with the maximum lag of 2.3x10^4 s observed between the 0.3-1 keV and 5-10 keV bands. Furthermore we discovered that the temporal profile of the flare clearly changes with energy, being more symmetric at higher energies. From the spectral fitting of multi-wavelength data assuming a one-zone, homogeneous synchrotron self-Compton model, we obtain B~0.047 G, emission region size R = 3.0x10^16 cm for an appropriate beaming with a Doppler factor of delta = 20. This value of B is in good agreement with an independent estimate through the model fit to the observed time lag ascribing the energy-dependent variability to differential acceleration timescale of relativistic electrons provided that the gyro-factor ξis 10^5.
description: 11 pages, 3 figures, Accepted for publication in ApJL
Logarithmic corrections and soft photon phenomenology in the multipole model of the nucleon form factors
Creators: name: Vereshkov, G.
name: Lalakulich, O.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyzed the presently available experimental data on nucleon electromagnetic form factors within a multipole model based on dispersion relations. A good fit of the data is achieved by considering the coefficients of the multipole expansions as logarithmic functions of the momentum transfer squared. The superconvergence relations, applied to this coefficients, makes the model agree with unitary constraints and pQCD asymptotics for the Dirac and Pauli form factors. The soft photon emission is proposed as a mechanism responsible for the difference between the Rosenbluth, polarization and beam--target--asymmetry data. It is shown, that the experimentally measured cross sections depend not only on the Dirac and Pauli form factors, but also on the average number of the photons emitted. For proton this number is shown to be different for different types of experimental measurements and then estimated phenomenologically. For neutron the same mechanism predicts, that the data form different types of experiments must coincide with high accuracy. A joint fit of all the experimental data reproduce the $Q^2-$dependence with the accuracy $χ^2/dof=0.86$. Predictions of the model, that 1) the ratios of the proton form factors $G_E/G_M$ are different for Rosenbluth, polarization and beam--target--asymmetry experiments and 2) similar ratios are nearly the same for neutron, can be used for experimental verification of the model.
description: 14 pages in 2-column format, 4 figures, references added, typos corrected, minor changes in the text, accepted in Eur. Phys. Journal A
Chimera Time-Crystalline order in quantum spin networks
Creators: name: Sakurai, A.
name: Bastidas, V. M.
name: Munro, W. J.
name: Nemoto, Kae
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Symmetries are well known to have had a profound role in our understanding of nature and are a critical design concept for the realization of advanced technologies. In fact, many symmetry-broken states associated with different phases of matter appear in a variety of quantum technology applications. Such symmetries are normally broken in spatial dimension, however they can also be broken temporally leading to the concept of discrete time symmetries and their associated crystals. Discrete time crystals (DTCs) are a novel state of matter emerging in periodically-driven quantum systems. Typically, they have been investigated assuming individual control operations with uniform rotation errors across the entire system. In this work we explore a new paradigm arising from non-uniform rotation errors, where two dramatically different phases of matter coexist in well defined regions of space. We consider a quantum spin network possessing long-range interactions where different driving operations act on different regions of that network. What results from its inherent symmetries is a system where one region is a DTC, while the second is ferromagnetic. We envision our work to open a new avenue of research on Chimera-like phases of matter where two different phases coexist in space.
description: 5 pages, 4 Figures and supplemental material. Accepted for Publication in Physical Review Letters. Comments are welcome
Sum-frequency generation of 589 nm light with near-unit efficiency
Creators: name: Mimoun, Emmanuel
name: De Sarlo, Luigi
name: Zondy, Jean-Jacques
name: Dalibard, Jean
name: Gerbier, Fabrice
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report on a laser source at 589 nm based on sum-frequency generation of two infrared laser at 1064 nm and 1319 nm. Output power as high as 800 mW are achieved starting from 370 mW at 1319 nm and 770 mW at 1064 nm, corresponding to converting roughly 90% of the 1319 nm photons entering the cavity. The power and frequency stability of this source are ideally suited for cooling and trapping of sodium atoms.