Long-term dynamics of Methone, Anthe and Pallene

We numerically investigate the long-term dynamics of the Saturn's small satellites Methone (S/2004 S1), Anthe (S/2007 S4) and Pallene (S/2004 S2). In our numerical integrations, these satellites are disturbed by non-spherical shape of Saturn and the six nearest regular satellites. The stability of the small bodies is studied here by analyzing long-term evolution of their orbital elements. We show that long-term evolution of Pallene is dictated by a quasi secular resonance involving the ascending nodes ($\Omega$) and longitudes of pericentric distances ($\varpi$) of Mimas (subscript 1) and Pallene (subscript 2), which critical argument is $\varpi_2-\varpi_1-\Omega_1+\Omega_2$. Long-term orbital evolution of Methone and Anthe are probably chaotic since: i) their orbits randomly cross the orbit of Mimas in time scales of thousands years); ii) numerical simulations involving both small satellites are strongly affected by small changes in the initial conditions.Comment: 9 pages; 4 figures. Submitted to Proceedings IAU Symposium No. S263, 200

Integrating Clinical Staging and Phenomenological Psychopathology to Add Depth, Nuance, and Utility to Clinical Phenotyping: A Heuristic Challenge

Psychiatry has witnessed a new wave of approaches to clinical phenotyping and the study of psychopathology, including the National Institute of Mental Health’s Research Domain Criteria, clinical staging, network approaches, the Hierarchical Taxonomy of Psychopathology, and the general psychopathology factor, as well as a revival of interest in phenomenological psychopathology. The question naturally emerges as to what the relationship between these new approaches is – are they mutually exclusive, competing approaches, or can they be integrated in some way and used to enrich each other? In this opinion piece, we propose a possible integration between clinical staging and phenomenological psychopathology. Domains identified in phenomenological psychopathology, such as selfhood, embodiment, affectivity, etc., can be overlaid on clinical stages in order to enrich and deepen the phenotypes captured in clinical staging (‘high resolution’ clinical phenotypes). This approach may be useful both ideographically and nomothetically, in that it could complement diagnosis, enrich clinical formulation, and inform treatment of individual patients, as well as help guide aetiological, prediction, and treatment research. The overlaying of phenomenological domains on clinical stages may require that these domains are reformulated in dimensional rather than categorial terms. This integrative project requires assessment tools, some of which are already available, that are sensitive and thorough enough to pick up on the range of relevant psychopathology. The proposed approach offers opportunities for mutual enrichment: clinical staging may be enriched by introducing greater depth to phenotypes; phenomenological psychopathology may be enriched by introducing stages of severity and disorder progression to phenomenological analysis

Propuesta de mejora al sistema de gestion de la calidad de una empresa agroindustrial basado en la norma ISO 9001:2000

264 p.La presente Memoria de Título es un trabajo de investigación que propone una serie de actividades secuenciales para dar solución a un problema particular de la empresa IANSAFRUT S.A. situada en la ciudad de Molina, VII región. El punto de partida fue la propuesta de trabajo entregada por el Subgerente Industrial de la organización, la que tenía relación con la Norma Internacional ISO 9001:2000. Asimismo y tras sostener diálogos con otros administrativos del lugar, se concluyó que todos los problemas evidentes de la empresa estaban en el marco de la misma Norma. Y es por esta razón que se decidió realizar un estudio de cómo la organización se desempeñaba hacia los requisitos exigidos por Norma Internacional ISO 9001:2000. Se comenzó por definir y formalizar claramente la problemática existente, los objetivos generales y específicos del trabajo, los resultados esperados de la Memoria y la metodología de solución mas adecuada. Posteriormente se presenta el marco teórico que respalda el trabajo presentado en esta Memoria de Título y se realiza una descripción de la organización y de su sistema de gestión de la calidad. Para poder medir y determinar el grado de cumplimiento de la organización hacia los requerimientos de la Norma, se hizo uso de la Norma Internacional ISO 19011:2002, la cual permitió determinar de manera cualitativa y cuantitativa el desempeño del sistema de gestión de la calidad de la organización. De acuerdo a lo anterior se pudo apreciar que ciertos elementos de la Norma ISO 9001: 2000 poseían un desempeño regular en sus prácticas, lo que significaba una importante oportunidad de mejora. Este fue el comienzo para el desarrollo y propuesta de una serie de herramientas, técnicas, metodologías y actividades para elevar el desempeño del sistema de gestión de la calidad de IANSAFRUT S.A. Finalmente, en el capítulo de conclusiones, junto con evaluar el cumplimiento hacia los objetivos y resultados esperados, se calculó el impacto potencial que poseían estos instrumentos para mejorar el desempeño y se garantizó una mejora promedio de 12.41% hacia los requisitos impuestos por la Norma Internacional ISO 9001:2000

A parameterization of flow separation over subaqueous dunes

Flow separation plays a key role in the development of dunes, and modeling the complicated flow behavior inside the flow separation zone requires much computational effort. To make a first step toward modeling dune development at reasonable temporal and spatial scales, a parameterization of the shape of the flow separation zone over two-dimensional dunes is proposed herein, in order to avoid modeling the complex flow inside the flow separation zone. Flow separation behind dunes, with an angle-of-repose slip face, is characterized by a large circulating leeside eddy, where a separation streamline forms the upper boundary of the recirculating eddy. Experimental data of turbulent flow over two-dimensional subaqueous bed forms are used to parameterize this separation streamline. The bed forms have various heights and height to length ratios, and a wide range of flow conditions is analyzed. This paper shows that the shape of the flow separation zone can be approximated by a third-order polynomial as a function of the distance away from the flow separation point. The coefficients of the polynomial can be estimated, independent of flow conditions, on the basis of bed form shape at the flow separation point and a constant angle of the separation streamline at the flow reattachment point. \ud \u

A First-Principles Approach to Insulators in Finite Electric Fields

We describe a method for computing the response of an insulator to a static, homogeneous electric field. It consists of iteratively minimizing an electric enthalpy functional expressed in terms of occupied Bloch-like states on a uniform grid of k points. The functional has equivalent local minima below a critical field E_c that depends inversely on the density of k points; the disappearance of the minima at E_c signals the onset of Zener breakdown. We illustrate the procedure by computing the piezoelectric and nonlinear dielectric susceptibility tensors of III-V semiconductors.Comment: 4 pages, with 1 postscript figure embedded. Uses REVTEX and epsf macros. Also available at http://www.physics.rutgers.edu/~dhv/preprints/is_ef/index.htm

Is Soccer a lie or simply a complex system?

Understanding soccer as a complex system we base on nature and the collective behavior of many organisms that "do calculations," seeking to generate solutions in a bioinspired way. When soccer mysteries appear, complex systems science emerges as a means to provide explanations. However, given the variety of interpretations that complexity and its associated properties can have and the understanding of what a complex system is, it is convenient to provide some elements to understand how unpredictability in soccer gives way to hundreds of counterintuitive results and how the science of complexity could contribute to the understanding of many phenomena in this sport. In this context, the manuscript's objective is to synthetically address some of the most important aspects of applied complexity to soccer to bring science and sport closer togetherComment: 15 pages, in Spanish language, 6 Figure

SEEDS: Exponential SDE Solvers for Fast High-Quality Sampling from Diffusion Models

A potent class of generative models known as Diffusion Probabilistic Models (DPMs) has become prominent. A forward diffusion process adds gradually noise to data, while a model learns to gradually denoise. Sampling from pre-trained DPMs is obtained by solving differential equations (DE) defined by the learnt model, a process which has shown to be prohibitively slow. Numerous efforts on speeding-up this process have consisted on crafting powerful ODE solvers. Despite being quick, such solvers do not usually reach the optimal quality achieved by available slow SDE solvers. Our goal is to propose SDE solvers that reach optimal quality without requiring several hundreds or thousands of NFEs to achieve that goal. We propose Stochastic Explicit Exponential Derivative-free Solvers (SEEDS), improving and generalizing Exponential Integrator approaches to the stochastic case on several frameworks. After carefully analyzing the formulation of exact solutions of diffusion SDEs, we craft SEEDS to analytically compute the linear part of such solutions. Inspired by the Exponential Time-Differencing method, SEEDS use a novel treatment of the stochastic components of solutions, enabling the analytical computation of their variance, and contains high-order terms allowing to reach optimal quality sampling $\sim3$-$5\times$ faster than previous SDE methods. We validate our approach on several image generation benchmarks, showing that SEEDS outperform or are competitive with previous SDE solvers. Contrary to the latter, SEEDS are derivative and training free, and we fully prove strong convergence guarantees for them.Comment: 60 pages. Camera-Ready version for the 37th Conference on Neural Information Processing Systems (NeurIPS 2023