cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Toward understanding the formation of multiple systems - A pilot IRAM-PdBI survey of Class 0 objects
Creators: name: Maury, A. J.
name: Andre, Ph.
name: Hennebelle, P.
name: Motte, F.
name: Stamatellos, D.
name: Bate, M.
name: Belloche, A.
name: Duchene, G.
name: Whitworth, A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The formation process of binary stars and multiple systems is poorly understood. Here, we seek to determine the typical outcome of protostellar collapse and to constrain models of binary formation by core fragmentation during collapse, using high-resolution millimeter continuum imaging of very young (Class 0) protostars observed at the beginning of the main accretion phase. We carried out a pilot high-resolution study of 5 Class 0 objects, using the most extended (A) configuration of the IRAM PdBI at 1.3 mm, which allow us to probe the multiplicity of Class 0 protostars down to separations a ~50 AU and circumstellar mass ratios q ~0.07. We show that our PdBI observations revealed only wide (>1500 AU) protobinary systems and/or outflow-generated features. When combined with previous millimeter interferometric observations of Class 0 protostars, our pilot PdBI study tentatively suggests that the binary fraction in the ~ 75-1000 AU range increases from the Class 0 to the Class I stage. It also seems to argue against purely hydrodynamic models of binary star formation. We briefly discuss possible alternative scenarios to reconcile the low multiplicity rate of Class 0 protostars on small scales with the higher binary fraction observed at later evolutionary stages.
description: Accepted for publication in Astronomy and Astrophysics. Abstract has been shortened
On mathematical models for Bose-Einstein condensates in optical lattices (expanded version)
Creators: name: Aftalion, Amandine
name: Helffer, Bernard
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Our aim is to analyze the various energy functionals appearing in the physics literature and describing the behavior of a Bose-Einstein condensate in an optical lattice. We want to justify the use of some reduced models. For that purpose, we will use the semi-classical analysis developed for linear problems related to the Schrödinger operator with periodic potential or multiple wells potentials. We justify, in some asymptotic regimes, the reduction to low dimensional problems and analyze the reduced problems.
Salinity intrusion in the Fraser River, British Columbia
Creators: name: Hodgins, Donald Ormond
Publisher: name: University of British Columbia
Year: 2010

description: The dynamics of salt water intrusion in the tidal Fraser estuary was studied by both a programme of field measurements and the use of numerical solutions of the equations of motion. Time series conductivity measurements spanning several tidal cycles indicated significant penetrations exceeding an estimated 15 kilometers above Steveston for tides of large diurnal inequality. Large ebb tides washed salt water out of the river despite low winter discharges averaging 1100 m³/sec. Mixing sufficient to disperse the salt water throughout the water column was not observed although surface currents typically ebb between 2 and 3 meters/second, and the salt wedge appeared to flood and ebb in a fairly well-defined layer. Longitudinal salinity gradients were detectable in each layer, indicating that two-way mixing took place during flood and ebb periods. Both conductivity and velocity data revealed that maximum intrusion lagged high water by 60 to 80 minutes near the river mouth. A numerical two-layer model predicted the salt water thickness within 10 per cent of the total depth and a phase agreement of ± 40 minutes at maximum intrusion. Velocities were comparable to measurements within 15 cm/sec. The model neglected mixing across the interface but included the Reynold's stress formulated as KipU|U|Fi where Ki=0.0075, U is the relative layer velocity and Fi is an interfacial Froude number. The bottom stress was included as Kbp¹u¹|u¹| where Kb=0.0055, and both stresses were found to be significant in the dissipation of energy in the flows.
THE FOOD START-UP ECONOMY: IMAGINED FUTURES, ETHICS AND FINANCIAL EVALUATIONS
Creators: name: LUISE, VINCENZO
Publisher: name: Universit� degli Studi di Milano
Year: 2019

description: Le politiche neoliberali, la diffusione delle nuove tecnologie digitali e le innovazioni delle forme organizzative del lavoro hanno prodotto una transizione fondamentale verso un'economia basata sulla produzione a un'economia basata sui servizi. Nella societ� post-fordista, i sistemi socio-economici sono basati sulla produzione, riproduzione e sul consumo di informazioni e conoscenze. Ci� ha trasformato la natura stessa del lavoro che � caratterizzato da pratiche lavorative individualizzate, interconnesse e altamente performative. Questo ha generato la creazione di un numero crescente di start-up digitali radicate nell'ideologia californiana. Il presente lavoro mira a esplorare la natura multiforme dell'economia ?food start-up? da tre diverse prospettive teoriche: l?immaginato sul futuro, le vocazioni imprenditoriali e le pratiche di valutazione finanziaria. La prima prospettiva mi consente di descrivere come gli start-uppers creano proiezioni narrative sulle economie future e su come loro cercano di colmare il divario tra il presente e un futuro imprevedibile. La seconda spiega in quali luoghi e attraverso quali pratiche gli start-uppers sviluppano ed eseguono specifiche attitudini imprenditoriali. La terza si focalizza sulle dinamiche e sugli assets che influenzano il valore finanziario delle start-ups. Coerentemente con questo quadro teorico, la strategia metodologica adottata si basa sugli ?inventive methods? all?interno di un approccio mixed methods. Ho combinato diverse tecniche metodologiche come l'etnografia, interviste semi-strutturate e tecniche di digital methods. Questo lavoro ha mostrato come le economie immaginate e le vocazioni imprenditoriali influenzano le valutazioni finanziarie. Il valore economico non � basato su metriche quantitative e sul calcolo probabilistico. Ma, da un lato, il ruolo dell'immaginario economico � necessario per agire in un contesto economico incerto in modo consapevole. D'altro canto, le attitudini imprenditoriali rappresentano il principale asset su cui si basano queste valutazioni finanziarie. In altre parole, gli start-uppers devono dimostrare attraverso performance pubbliche che possiedono le capacit� per avere successo. Questo gli consente di ricevere investimenti. Pertanto, le aspettative su un futuro immaginato e le performance della ?chiamata imprenditoriale? sono le fonti di valore finanziario nell'economia start-up.
Medios compositivos y nuevas formas de experiencia perceptiva en la poesía experimental española actual
Creators: name: López Fernández, Laura
Publisher: name: Università degli Studi di Milano
Year: 2014

description: La naturaleza híbrida y heterogénea de los modos poéticos experimentales —poéticas no versificadas y no declamatorias— constituye un rasgo distintivo de este macrogénero, el cual requiere para un mejor entendimiento un marco teórico apropiado y una revisión de las nociones convencionales de lírica, representación y discursividad. En este estudio se revisan estas nociones dentro del contexto poético español del siglo XXI y se presenta un nuevo modo de acercamiento a estas textualidades alteradas donde se subraya la no linealidad, los lenguajes no verbales y la tecnología como herramientas integrales en el proceso de creación y descodificación de estos múltiples modos compositivos.
description: Tintas: Quaderni di Letterature iberiche e iberoamericane, Experimental (ed. y coord. de Raúl Díaz Rosales)
ROLE OF OBESITY IN THE DEVELOPMENT OF ACUTE PROMYELOCYTIC LEUKEMIA (APL)
Creators: name: FALVO, PAOLO
Publisher: name: Universit� degli Studi di Milano
Year: 2019

description: Obesity is a pathological condition characterized by an augmented presence of fat mass in the body, and a known risk factor for many cancer types. Clinical data have shown that the incidence of acute promyelocytic leukaemia (APL) is strongly correlated with obesity. APL is characterized by reciprocal translocation between chromosomes 15 and 17 resulting in the formation of the PML/RAR? oncoprotein. However, the molecular mechanisms explaining the effects of obesity on APL development have not been elucidated. To recapitulate clinical observations, we characterized a mouse model of diet-induced obesity using transgenic mice constitutively expressing PML/RAR? in the hematopoietic system (PML/RAR? KI mice) and wild type mice as a control. Mice were fed standard diet (SD) or high fat diet (HFD), and leukaemia-free survival was monitored. We observed that HFD-fed PML/RAR? KI mice developed leukaemia earlier and with higher penetrance than SD-fed mice. We evaluated the extent of DNA damage in hematopoietic stem cells (HSC) after four months of diet. We demonstrated that HFD-fed PML/RAR? KI mice presented a 40% increase of DNA damage in HSCs as compared to SD-fed PML/RAR? mice. However, this was not associated with an increased mutational load as revealed by whole genome sequencing-based method. We investigated whether HFD confers a proliferative advantage to PML/RAR? bone marrow using colony forming assays. Indeed, we observed that HFD PML/RAR? bone marrow has a higher clonogenicity than bone marrow from SD-fed mice. Finally, we demonstrated that linoleic acid (LA), which is the main component of HFD increases PML/RAR? enhanced self-renewal.
Nota biobibliográfica + poética + creaciones («La libertad es el infinito», «Siete palabras», «Acerca de Lenin», «Besos», «Mail-art» y «Luz para un náufrago») + cuestionario (Victoria Pineda)
Creators: name: Seafree, J.
Publisher: name: Università degli Studi di Milano
Year: 2014

description: Nota biobibliográfica + poética + creaciones («La libertad es el infinito», «Siete palabras», «Acerca de Lenin», «Besos», «Mail-art» y «Luz para un náufrago») + cuestionario (Victoria Pineda)
description: Tintas: Quaderni di Letterature iberiche e iberoamericane, Experimental (ed. y coord. de Raúl Díaz Rosales)
Hybridization and Dehybridization of Plasmonic Modes
Creators: name: Movsesyan, Artur
name: Muravitskaya, Alina
name: Castilla, Marion
name: Kostcheev, Sergei
name: Proust, Julien
name: Plain, Jérôme
name: Baudrion, Anne-Laure
name: Vincent, Rémi
name: Adam, Pierre-Michel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The plasmon resonances (modes) of a metal nanostructure can be defined as a dipole, a quadrupole, or high-order modes depending on the surface charge distribution induced by the incident field. In a non-symmetrical environment or clusters, the modes can hybridize and exhibit different behavior and properties. In this work, we study experimentally and numerically the substrate-induced hybridization of plasmonic modes of a silver nanocylinder. The applications of plasmonic nanoparticles such as refractive index sensing and enhanced spectroscopies often rely on the sustained mode spectral position and specific spatial near-field distribution. However, we show that the implementation of such plasmonic nanoparticles in a sensing system can result in a change of the modes nature, its hybridization or dehybridization. These changes are not clearly pronounced in the far-field spectra and then may result in unexpected modifications of the sensor behavior. We show that the hybridization between the dipolar and quadrupolar modes of the plasmonic nanoparticle on the substrate results from quadrupolar mode excitation due to the superposition of the reflected and incoming light and, then, depends on the reflection of the substrate. The existence of the hybridized modes strongly depends on the surrounding environment of nanoparticles, and after the deposition of the nanometric polymer layer on top of the nanoparticle the hybridized modes vanish and are replaced by uncoupled multipolar resonances.
description: 18 pages, 6 figures
Effective field theories for heavy quarkonium at finite temperature
Creators: name: Vairo, Antonio
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the recent development of effective field theories for quarkonium at finite temperature.
description: Plenary talk given at the 8th Conference Quark Confinement and the Hadron Spectrum, September 1-6, 2008, Mainz, Germany; 11 pages, 9 figures, PoS
Apuntes para una prehistoria de la vanguardia
Creators: name: De Cózar, Rafael
Publisher: name: Università degli Studi di Milano
Year: 2014

description: El artículo recoge, muy en síntesis, algunas ideas sobre los precedentes de la poesía experimental anteriores al siglo XX, con ejemplos significativos, que demuestran puntos de conexión con algunas líneas de dicha poesía experimental. En conjunto corresponden a lo que, desde la tradición, viene llamándose manierismos literarios, esfuerzos de ingenio, poesía artificiosa, rarezas o extravagancias literarias, un campo poco trabajado por los especialistas y que fue la base de mi tesis doctoral, luego publicada bajo el título Poesía e Imagen (Sevilla,1992)
description: Tintas: Quaderni di Letterature iberiche e iberoamericane, Experimental (ed. y coord. de Raúl Díaz Rosales)
Waring's Problem and the Alexander-Hirschowitz Theorem
Creators: name: Lynch, Ryan
Publisher: name: University of Notre Dame
Year: 2023

description: The Big Waring Problem for polynomials asks for the smallest number *s* such that almost all homogeneous polynomial of degree *d* can be decomposed as the sum of at most *s* *d*-th powers of linear forms. This thesis sets out to describe the solution to the Big Waring Problem. We follow the proof by Brambilla and Ottaviani. We first rephrase the problem in terms of Veronese varieties, and subsequently prove the Alexander-Hirschowitz Theorem, a result in algebraic geometry that is equivalent to the Big Waring Problem. The theorem studies the behavior of Hilbert functions of collections of double points in ***P***_*n*. We then describe the Waring rank of sums of pairwise coprime monomials of fixed degree.
GARANTÍAS JURÍDICAS FUNDAMENTALES: EL MICROCRÉDITO
Creators: name: Pereira dos Santos, Paulo Adão
Publisher: name: Zenodo
Year: 2018
Subjects: Microcrédito
Pobreza
Exclusión social y financiera
Garantías jurídicas
Gestión positiva

description: RESUMEN El microcrédito se presenta como un instrumento eficaz de inclusión social y combate a la pobreza utilizado desde hace muchos años por diversos gobiernos El acceso al microcrédito para las personas de bajos ingresos en Angola, Argentina y Brasil no alcanza una dimensión y sostenibilidad que mejore la condición de pobreza y la dignidad humana para aquellos que lo necesitan. Así que es necesaria una garantía constitucional que aumente el acceso a los empréstitos y mejore la condición humana de los carenciados. El presente trabajo de tesis doctoral se propone estudiar la relación entre la persona humana y la solidaridad, las garantías jurídicas fundamentales y su constitucionalidad, acceso económico y microcrédito, pobreza, exclusión social y financiera, y el desarrollo. Palabras-Claves: Microcrédito, pobreza, exclusión social y financiera, garantías jurídicas
description: El presente trabajo de tesis de doctorado es una propuesta de mejora al actual estado de ineficacia en la implementación de los proyectos de microcrédito en varios países. Por cuestiones de orden práctica, el estudio se limita a Angola, Argentina y Brasil.
title: Nonpoint Source Transport Model for Indicator Bacteria from Western Rangeland Watersheds
Creators: name: Springer, Everett P.
Publisher: name: Utah State University
Year: 1982

description: Grazing is a primary land use in much of the western United States, but little is known about grazing impacts on water quality. The most sensitive water quality indicators of grazing are the fecal indicator bacteria. The objective of this study was to develop a general transport model describing the movement of fecal indicator bacteria from upland sources to channel systems.
Model development was done using simulated rainfall and a runoff surface 30.48 m by 1.83 m.
Initially the runoff surface was smooth concrete and was used to examine the effects of distance from the outlet on coliform counts by locating fecal material at various distances for five replications. Afterwards, the surface was covered by clay soil. Total and fecal coliforms were determined by the multiple-tube method.
Overland flow was described by the kinematic wave equations. Bacterial transport was modeled with a random ordinary differential equation. Initial conditions and assumptions allowed solution for the probability density function (pdf), means, and variances.
The pdf at the slope outlet was found to be normal for the assumed conditions. Solutions for the means and variances were different because initial conditions differed for the relationship between equilibrium and travel time. Three parameters were fitted, a mean retention and two variance terms. The retention parameter appeared to be constant for all cases. The variance terms were obtained only for the rising hydrograph.
For the concrete surface, comparison of predicted and observed means and variances indicated poor fits during initial stages of simulation. Observed values attained steady state rapidly.
There was no replication on the soil surface, and an initial run found high background counts. Background counts were considered to be constant and incorporated into the mean equation. A numerical solution to the mean equation was required because of the unsteady rainfall excess. The background counts and clay content of the soil prevented detection of impacts from a single source.
Quantum Holographic Encoding in a Two-dimensional Electron Gas
Creators: name: Moon, Christopher R.
name: Mattos, Laila S.
name: Foster, Brian K.
name: Zeltzer, Gabriel
name: Manoharan, Hari C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The advent of bottom-up atomic manipulation heralded a new horizon for attainable information density, as it allowed a bit of information to be represented by a single atom. The discrete spacing between atoms in condensed matter has thus set a rigid limit on the maximum possible information density. While modern technologies are still far from this scale, all theoretical downscaling of devices terminates at this spatial limit. Here, however, we break this barrier with electronic quantum encoding scaled to subatomic densities. We use atomic manipulation to first construct open nanostructures--"molecular holograms"--which in turn concentrate information into a medium free of lattice constraints: the quantum states of a two-dimensional degenerate Fermi gas of electrons. The information embedded in the holograms is transcoded at even smaller length scales into an atomically uniform area of a copper surface, where it is densely projected into both two spatial degrees of freedom and a third holographic dimension mapped to energy. In analogy to optical volume holography, this requires precise amplitude and phase engineering of electron wavefunctions to assemble pages of information volumetrically. This data is read out by mapping the energy-resolved electron density of states with a scanning tunnelling microscope. As the projection and readout are both extremely near-field, and because we use native quantum states rather than an external beam, we are not limited by lensing or collimation and can create electronically projected objects with features as small as ~0.3 nm. These techniques reach unprecedented densities exceeding 20 bits/nm2 and place tens of bits into a single fermionic state.
description: Published online 25 January 2009 in Nature Nanotechnology; 12 page manuscript (including 4 figures) + 2 page supplement (including 1 figure); supplementary movie available at http://mota.stanford.edu
Neuroendocrine contribution to sex-related variations in adverse air pollution health effects
Creators: name: Alewel, Devin I.
name: Kodavanti, Urmila P.
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biophysics
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Mental Health
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Air pollution exposure is ranked as a leading environmental risk factor for not only cardiopulmonary diseases but also for systemic health ailments including diabetes, reproductive abnormalities, and neuropsychiatric disorders, likely mediated by central neural stress mechanisms. Current experimental evidence links many air pollution health outcomes with activation of neuroendocrine sympathetic-adrenal-medullary and hypothalamic–pituitary–adrenal (HPA) stress axes associated with resultant increases in adrenal-derived hormone levels acting as circulating mediators of multi-organ stress reactions. Epidemiological and experimental investigations also demonstrated sex-specific responses to air pollutant inhalation, which may be attributed to hormonal interactions within the stress and reproductive axes. Sex hormones (androgens and estrogens) interact with neuroendocrine functions to influence hypothalamic responses, subsequently augmenting stress-mediated metabolic and immune changes. These neurohormonal interactions may contribute to innate sex-specific responses to inhaled irritants, inducing differing individual susceptibility. The aim of this review was to: (1) examine neuroendocrine co-regulation of the HPA axis by gonadal hormones, (2) provide experimental evidence demonstrating sex-specific respiratory and systemic effects attributed to air pollutant inhalation exposure, and (3) postulate proposed mechanisms of stress and sex hormone interactions during air pollution-related stress. Air pollution exposure responses are co-regulated by stress and sex hormonesHypothalamic and CNS stress reactions are sensitive to sex hormonesEstrogen and testosterone influence HPA axis induction and glucocorticoid dynamicsNeuroendocrine axes interactions mediate sex-specific air pollutant health effects Air pollution exposure responses are co-regulated by stress and sex hormones Hypothalamic and CNS stress reactions are sensitive to sex hormones Estrogen and testosterone influence HPA axis induction and glucocorticoid dynamics Neuroendocrine axes interactions mediate sex-specific air pollutant health effects
ЭКОЛОГИЯ ВА АТРОФ-МУҲИТНИ МУҲОФАЗА ҚИЛИШ СОҲАСИДА ПРОКУРОР  НАЗОРАТ ҚИЛИШДА ПРОКУРАТУРА ОРГАНЛАРИ ФАОЛИЯТИНИНГ ЎЗИГА ХОС ХУСУСИЯТЛАРИ
Creators: name: Ахмаджанов, Отабек
Publisher: name: Zenodo
Year: 2024

description: Мазкур мақолада экология ва атроф-муҳитни муҳофаза қилиш соҳасида прокурор  назорат қилишда прокуратура органлари фаолиятининг ўзига хос хусусиятларига доир масалалар таҳлил этилган. Шунингдек, мазкур мақолада бу масалага доир  олимларнинг фикрлари ҳам ўрганилган.
In quanto progetto politico. A proposito di pedagogia, ideologia, scienza
Creators: name: Erbetta, Antonio
Publisher: name: Studi sulla Formazione
Year: 2010

description: The author points out that since the last decades of the last century has felt the urgent need for a redefinition of the epistemological pedagogical knowledge. So to return to teaching itself, now menaced by the educational sciences, a role specification, marked by procedural and methodological rigor. The author reminds us of the inseparable link between the ethical and political dimension of pedagogy, never forget that education is especially critical to pedagogy.
description: Studi sulla Formazione, Anno XII, I/II-2009
$R^2$ Inflation Revisited and Dark Energy Corrections
Creators: name: Odintsov, S. D.
name: Oikonomou, V. K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The vacuum $R^2$ model is known to generate a quasi-de Sitter evolution for inflation, using solely the slow-roll assumptions. Using standard reconstruction techniques, we demonstrate that the $f(R)$ gravity which actually realizes the quasi-de Sitter evolution is not simply the $R^2$ model but a deformed $R^2$ model which contains extra terms in addition to the $R^2$ model. We analyze in detail the inflationary dynamics of the deformed $R^2$ model and we demonstrate that the predictions are quite close to the ones of the pure $R^2$ model, regardless the values of the free parameters. Basically the deformed $R^2$ model is also a single parameter inflationary model, exactly like the ordinary $R^2$ model. In contrast to the early-time era, where the deformed $R^2$ model is quite similar to the $R^2$ model, at late times, the phenomenological picture is different. The deformed $R^2$ model describes stronger gravity compared to the ordinary $R^2$ with an effectively smaller effective Planck mass. We propose the addition of an early dark energy term which does not affect at all the inflationary era, but takes over the control of the late-time dynamics at late times. We study in some detail the predicted dark energy era evolution, and we demonstrate that the dark energy corrected deformed $R^2$ model can describe a viable dark energy era, compatible with the Planck constraints on cosmological parameters. Furthermore the model is distinct from the $Λ$-Cold-Dark-Matter model, but shows a qualitatively similar behavior.
description: PRD Accepted
X-ray confirmation of the intermediate polar IGR J16547-1916
Creators: name: Joshi, A.
name: Wang, W.
name: Pandey, J. C.
name: Singh, K. P.
name: Naik, S.
name: Raj, A.
name: Anupama, G. C.
name: Rawat, N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Using X-ray observations from the NuSTAR and Swift satellites, we present temporal and spectral properties of an intermediate polar (IP) IGR J16547-1916. A persistent X-ray period at ~ 546 s confirming the optical spin period obtained from previous observations is detected. The detection of a strong X-ray spin pulse reinforces the classification of this system as an intermediate polar. The lack of orbital or side-band periodicities in the X-rays implies that the system is accreting predominantly via a disk. A variable covering absorber appears to be responsible for the spin pulsations in the low energy range. In the high energy band, the pulsations are likely due to the self occultation of tall shocks above the white dwarf surface. The observed double-humped X-ray spin pulse profile indicates two-pole accretion geometry with tall accretion regions in short rotating IP IGR J16547-1916. We present the variation of the spin pulse profile over an orbital phase to account for the effects of orbital motion on the spin pulsation. X-ray spectra obtained from the contemporaneous observations of Swift and NuSTAR in the 0.5-78.0 keV energy band are modeled with a maximum temperature of 31 keV and a blackbody temperature of 64 eV, along with a common column density of $1.8\times10^{23} cm^{-2}$ and a power-law index of -0.22 for the covering fraction. An additional Gaussian component and a reflection component are needed to account for a fluorescent emission line at 6.4 keV and the occurrence of X-ray reflection in the system. We also present the spin phase-resolved spectral variations of IGR J16547-1916 in the 0.5-78.0 keV energy band and find dependencies in the X-ray spectral parameters during the rotation of the white dwarf.
description: 12 pages, 8 figures, Accepted for publication in A&A
Effective polar potential in the central force Schrodinger equation
Creators: name: Shikakhwa, M. S.
name: Mustafa, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The angular part of the Schrodinger equation for a central potential is brought to the one-dimensional 'Schrodinger form' where one has a kinetic energy plus potential energy terms. The resulting polar potential is seen to be a family of potentials characterized by the square of the magnetic quantum number m. It is demonstrated that this potential can be viewed as a confining potential that attempts to confine the particle to the xy-plane, with a strength that increases with increasing m. Linking the solutions of the equation to the conventional solutions of the angular equation, i.e. the associated Legendre functions, we show that the variation in the spatial distribution of the latter for different values of the orbital angular quantum number l can be viewed as being a result of 'squeezing' with different strengths by the introduced 'polar potential'.
description: This is an author-created, un-copyedited version of an article accepted for publication in European Journal of Physics
title: A Critical Analysis of Methods of Securing Basic Irrigation Data used in Water Right Determinations
Creators: name: Bishop, A. Alvin
Publisher: name: Utah State University
Year: 1938

description: Agriculture in the Western United States is almost entirely dependent upon irrigation. Irrigation has transformed the desert lands into fertile, producing valleys. It has made possible communities and settlement areas which would otherwise be impossible. Although the achievements of irrigation have been great, there still remains millions of acres of fertile land that will never be reclaimed because there is not available water.
Helium star donor channel for the progenitors of type Ia supernovae
Creators: name: Wang, B.
name: Meng, X.
name: Chen, X.
name: Han, Z.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Type Ia supernovae (SNe Ia) play an important role in astrophysics, especially in the study of cosmic evolution. There are several progenitor models for SNe Ia proposed in the past years. In this paper, we have carried out a detailed study of the He star donor channel, in which a carbon-oxygen white dwarf (CO WD) accretes material from a He main sequence star or a He subgiant to increase its mass to the Chandrasekhar mass. Employing Eggleton's stellar evolution code with an optically thick wind assumption, and adopting the prescription of Kato & Hachisu (2004) for the mass accumulation efficiency of the He-shell flashes onto the WDs, we performed binary evolution calculations for about 2600 close WD binary systems. According to these calculations, we mapped out the initial parameters for SNe Ia in the orbital period--secondary mass ($\log P^{\rm i}-M^{\rm i}_2$) plane for various WD masses from this channel. The study shows that the He star donor channel is noteworthy for producing SNe Ia (i.e. $\sim 1.2\times10^{-3} {\rm yr}^{-1}$ in the Galaxy), and that the progenitors from this channel may appear as supersoft X-ray sources. Importantly, this channel can explain SNe Ia with short delay times ($\la 10^{8}$ yr), which is consistent with recent observational implications of young populations of SN Ia progenitors.
description: 9 pages, 8 figure, accepted by MNRAS
Age and mass of solar twins constrained by lithium abundance
Creators: name: Nascimento, J. D. do
name: Castro, M.
name: Melendez, J.
name: Bazot, M.
name: Theado, S.
name: de Mello, G. F. Porto
name: De Medeiros, J. R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We analyze the non-standard mixing history of the solar twins HIP 55459, HIP 79672, HIP 56948, HIP 73815, and HIP 100963, to determine as precisely as possible their mass and age. We computed a grid of evolutionary models with non-standard mixing at several metallicities with the Toulouse-Geneva code for a range of stellar masses assuming an error bar of +-50K in Teff. We choose the evolutionary model that reproduces accurately the observed low lithium abundances observed in the solar twins. Our best-fit model for each solar twin provides a mass and age solution constrained by their Li content and Teff determination. HIP 56948 is the most likely solar-twin candidate at the present time and our analysis infers a mass of 0.994 +- 0.004 Msun and an age of 4.71 +-1.39 Gyr. Non-standard mixing is required to explain the low Li abundances observed in solar twins. Li depletion due to additional mixing in solar twins is strongly mass dependent. An accurate lithium abundance measurement and non-standard models provide more precise information about the age and mass more robustly than determined by classical methods alone.
description: 10 pages, 5 figures, Accepted for publication in Astronomy and Astrophysics
A Chandra and Spitzer census of the young star cluster in the reflection nebula NGC 7129
Creators: name: Stelzer, B.
name: Scholz, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The reflection nebula NGC 7129 has long been known to be a site of recent star formation as evidenced, e.g., by the presence of deeply embedded protostars and HH objects. However, studies of the stellar population produced in the star formation process have remained rudimentary. At a presumed age of ~3 Myr, NGC7129 is in the critical range where disks around young stars disappear. We make use of Chandra X-ray and Spitzer and 2MASS IR imaging observations to identify the pre-main sequence stars in NGC7129. We define a sample of Young Stellar Objects based on color-color diagrams composed from IR photometry between 1.6 and 8 mu, from 2MASS and Spitzer, and based on X-ray detected sources from a Chandra observation. This sample is composed of 26 Class II and 25 Class III candidates. The sample is estimated to be complete down to ~ 0.5 solar masses. The most restricted and least biased sub-sample of pre-main sequence stars is composed of lightly absorbed (A_V < 5 mag) stars in the cluster core. This sample comprises 7 Class II and 14 Class III sources, it has a disk fraction of 33^{+24}_{-19} %, and a median X-ray luminosity of log (L_x) [erg/s] = 30.3. Despite the various uncertainties related to the sample selection, absorption, mass distribution, distance and, consequently, the computation of disk fraction and X-ray luminosities, the data yield consistent results. In particular, we confirm the age of ~3 Myr for the NGC7129 cluster. The derived disk fraction is similar to that of sigma Orionis, smaller than that of Cha I (~2 Myr), and larger than that of Upper Sco (5 Myr). The X-ray luminosity function is similar to that of NGC 2264 (2 Myr) but fainter than that of the Orion Nebula Cluster (1 Myr).
description: accepted for publication in Astronomy & Astrophysics
title: Direct Simulation from a Model Specification Language
Creators: name: Pimentel, Richard
Publisher: name: Utah State University
Year: 1986

description: The purpose of this thesis was to develop a program that would accept, as input, a finite set of algebraic equations and simple if-then conditional expressions that model a natural system, and then produce a continuous computer simulation with graphics and tabular output. The equations and conditionals can be in any order and key elements can be missing. The program can be used to run existing models or as a development tool to produce immediate prototypic computer simulations through synergistic man-machine interactions.
The theoretical aspects of automatic program generation were discussed, as well as the architectural design of the system. The simulation system was used to develop a computer simulation of an exploited Northern Utah pheasant population and the results were compared to the results from an earlier FORTRAN computer simulation of the same model.
It was concluded that the simulation system developed for this thesis produces verified computer simulations from mathematical models that are at least as accurate as the corresponding simulation written in FORTRAN. The system was easy to use and should be useful for unsophisticated users. Some "tuning'' of the input was needed to produce a verified simulation and it was concluded that further work was needed here.
ЭКОЛОГИЯ ВА АТРОФ-МУҲИТНИ МУҲОФАЗА ҚИЛИШ СОҲАСИДАГИ ҚОНУНЧИЛИК ИЖРОСИ УСТИДАН ПРОКУРОР  НАЗОРАТИ ТУШУНЧАСИ ВА УНИНГ ЎЗИГА ХОС ЖИҲАТЛАРИ
Creators: name: Ахмаджанов, Отабек
Publisher: name: Zenodo
Year: 2024

description: Мазкур мақолада экология ва атроф-муҳитни муҳофаза қилиш соҳасидаги қонунчилик ижроси устидан прокурор  назорати тушунчаси ва унинг ўзига хос жиҳатларига доир масалалар таҳлил этилган. Шунингдек, мазкур мақолада “прокурор назорати” тушунчасига доир олимларнинг фикрлари таҳлил этилган.
Hadamard-type inequalities for $k$-positive matrices
Creators: name: Le, Nam Q.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We establish Hadamard-type inequalities for a class of symmetric matrices called $k$-positive matrices for which the $m$-th elementary symmetric functions of their eigenvalues are positive for all $m\leq k$. These matrices arise naturally in the study of $k$-Hessian equations in Partial Differential Equations. For each $k$-positive matrix, we show that the sum of its principal minors of size $k$ is not larger than the $k$-th elementary symmetric function of their diagonal entries. The case $k=n$ corresponds to the classical Hadamard inequality for positive definite matrices. Some consequences are also obtained.
description: v2: The assumption in Lemma 2.2 of the published version in Linear Algebra Appl. was modified to make it invariant under conjugation with orthogonal matrices. All arguments and results remain unchanged
Spectral modelling of Cygnus A between 110 and 250 MHz. Impact on the LOFAR 21-cm signal power spectrum
Creators: name: Ceccotti, E.
name: Offringa, A. R.
name: Koopmans, L. V. E.
name: Mertens, F. G.
name: Mevius, M.
name: Acharya, A.
name: Brackenhoff, S. A.
name: Ciardi, B.
name: Gehlot, B. K.
name: Ghara, R.
name: Chege, J. K.
name: Ghosh, S.
name: Höfer, C.
name: Hothi, I.
name: Iliev, I. T.
name: McKean, J. P.
name: Munshi, S.
name: Zaroubi, S.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Studying the redshifted 21-cm signal from the the neutral hydrogen during the Epoch of Reionization and Cosmic Dawn is fundamental for understanding the physics of the early universe. One of the challenges that 21-cm experiments face is the contamination by bright foreground sources, such as Cygnus A, for which accurate spatial and spectral models are needed to minimise the residual contamination after their removal. In this work, we develop a new, high-resolution model of Cygnus A using Low Frequency Array (LOFAR) observations in the $110{-}250$ MHz range, improving upon previous models by incorporating physical spectral information through the forced-spectrum method during multi-frequency deconvolution. This approach addresses the limitations of earlier models by providing a more accurate representation of the complex structure and spectral behaviour of Cygnus A, including the spectral turnover in its brightest hotspots. The impact of this new model on the LOFAR 21-cm signal power spectrum is assessed by comparing it with both simulated and observed North Celestial Pole data sets. Significant improvements are observed in the cylindrical power spectrum along the Cygnus A direction, highlighting the importance of having spectrally accurate models of the brightest foreground sources. However, this improvement is washed out in the spherical power spectrum, where we measure differences of a few hundred mK at $k<0.63\,h\,\text{cMpc}^{-1}$, but not statistically significant. The results suggest that other systematic effects must be mitigated before a substantial impact on 21-cm power spectrum can be achieved.
description: 22 pages, 13 figures, 6 tables. Accepted for publication in A&A
Sulla pedagogia di Ferrante Aporti: note
Creators: name: Cambi, Franco
Publisher: name: Studi sulla Formazione
Year: 2011

description: The author, in his essay, reflects the importance of the work done by the priest of Cremona. He carefully read the writings of some scholars specialize on Aporti (for example Christina Sideri) and he is able to say that these extensive studies show a more complete Aporti. Aporti seems like a sophisticated renaissance educator, a man sensitive to the treatment of childhood and at the same time apolitically committed man, that binds to the positions of the Catholic-liberal. An important educator to read and study with more and more attention.
description: Studi sulla Formazione, Anno XIII, II-2010
PT -symmetry breaking and universal spectral statistics in quantum kicked rotors
Creators: name: Li, Guang
name: Chen, Fuxing
name: Fang, Ping
Publisher: name: arXiv
Year: 2025
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We investigate the spontaneous parity-time (PT )-symmetry breaking and spectral properties of a PT symmetric quantum kicked rotor under resonance conditions. At resonance, the QKR reduces to a finite-dimensional system. In the localized regime, we find that increasing the non-Hermitian parameter always induces a transition from a phase where the states exhibit PT symmetry to one where PT symmetry is spontaneously broken. In contrast, in the delocalized regime, the existence of such a transition depends on whether the reduced system is PT symmetric. If the reduced system is not PT symmetric, PT symmetry remains in the broken phase regardless of the non-Hermitian parameter. We further analyze the spectral statistics of the system in the delocalized regime. For real energy spectra, the level-spacing distribution transitions from Wigner-Dyson statistics, associated with the Gaussian orthogonal ensemble, to Poisson statistics as the non-Hermitian parameter increases, with the intermediate regime well described by the Brody distribution. For complex spectra, the level-spacing ratios and distributions are governed by time-reversal symmetry. The spectral statistics align with predictions for non-Hermitian random matrix ensembles in classes AI† and A, depending on the presence or absence of time-reversal symmetry. Our results provide insights into the spectral characteristics of non-Hermitian quantum chaotic systems and their connection to PT symmetry.
description: 7 pages with 7 figures
Erasing Distinguishability Using Quantum Frequency Up-Conversion
Creators: name: Takesue, Hiroki
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The frequency distinguishability of two single photons was successfully erased using single photon frequency up-conversion. A frequency non-degenerate photon pair generated via spontaneous four-wave mixing in a dispersion shifted fiber was used to emulate two telecom-band single photons that were in the same temporal mode but in different frequency modes. The frequencies of these photons were converted to the same frequency by using the sum frequency generation process in periodically poled lithium niobate waveguides, while maintaining their temporal indistinguishability. As a result, the two converted photons exhibited a non-classical dip in a Hong-Ou-Mandel quantum interference experiment. The present scheme will add flexibility to networking quantum information systems that use photons with various wavelengths.
description: 4 pages, 5 figures
The Critic's Voice: A Study on How Source Authorization Shapes Purchase Intentions in Varied Genres of Critique?
Creators: name: Blachash, Gil
name: Zimen, Shahar
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: זוהי הרשמה מראש למחקר שלנו, במסגרת הקורס פסיכולוגיה ניסויית
New Description of the Doublet Bands in Doubly Odd Nuclei
Creators: name: Ganev, H. G.
name: Georgieva, A. I.
name: Brant, S.
name: Ventura, A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The experimentally observed $ΔI = 1$ doublet bands in some odd-odd nuclei are analyzed within the orthosymplectic extension of the Interacting Vector Boson Model (IVBM). A new, purely collective interpretation of these bands is given on the basis of the obtained boson-fermion dynamical symmetry of the model. It is illustrated by its application to three odd-odd nuclei from the $A\sim 130$ region, namely $^{126}Pr$, $^{134}Pr$ and $^{132}La$. The theoretical predictions for the energy levels of the doublet bands as well as $E2$ and $M1$ transition probabilities between the states of the yrast band in the last two nuclei are compared with experiment and the results of other theoretical approaches. The obtained results reveal the applicability of the orthosymplectic extension of the IVBM.
description: 15 pages, 13 figures
Deep Extragalactic VIsible Legacy Survey (DEVILS): Evolution of the $σ_{\mathrm{SFR}}$-M$_{\star}$ relation and implications for self-regulated star formation
Creators: name: Davies, L. J. M.
name: Thorne, J. E.
name: Bellstedt, S.
name: Bravo, M.
name: Robotham, A. S. G.
name: Driver, S. P.
name: Cook, R. H. W.
name: Cortese, L.
name: D'Silva, J.
name: Grootes, M. W.
name: Holwerda, B. W.
name: Hopkins, A. M.
name: Jarvis, M. J.
name: Lidman, C.
name: Phillipps, S.
name: Siudek, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the evolution of the star-formation dispersion - stellar mass relation ($σ_{SFR}$-M$_{\star}$) in the DEVILS D10 region using new measurements derived using the ProSpect spectral energy distribution fitting code. We find that $σ_{SFR}$-M$_{\star}$ shows the characteristic 'U-shape' at intermediate stellar masses from 0.1
description: 22 pages, 14 figures, Accepted MNRAS
Polymer electret dosimetry
Creators: name: Chang, Charles
Publisher: name: University of British Columbia
Year: 2010

description: The work reported in this thesis investigates the possible use of thin film teflon electrets as X-ray dosimeters. Electrets were prepared by corona- and breakdown field-charging and found to exhibit a number of properties that would render them suitable for personnel dosimetry. The stability of the residual electret charge as a function of environment was also studied and it was found that hot, humid or unshielded conditions led to rapid charge decay.
On the Topology of Black Lenses
Creators: name: Ida, Daisuke
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The topological structure of the black holes in 5-dimensional space-times with a horizon diffeomorphic with the lens space has been discussed. It has been shown that such a black hole can emerge from the crease set, which is composed of the plumbings of several 2-spheres, of the event horizon. It has also been shown that such configurations are realized in the Kastor-Traschen solution of the Einstein-Maxwell system.
description: 27 pages, 19 figures