Algebraic computation of some intersection D-modules

Let $X$ be a complex analytic manifold, $D\subset X$ a locally quasi-homogeneous free divisor, $E$ an integrable logarithmic connection with respect to $D$ and $L$ the local system of the horizontal sections of $E$ on $X-D$. In this paper we give an algebraic description in terms of $E$ of the regular holonomic D-module whose de Rham complex is the intersection complex associated with $L$. As an application, we perform some effective computations in the case of quasi-homogeneous plane curves.Comment: 18 page

Deformation Quantization: Quantum Mechanics Lives and Works in Phase-Space

Wigner's quasi-probability distribution function in phase-space is a special (Weyl) representation of the density matrix. It has been useful in describing quantum transport in quantum optics; nuclear physics; decoherence (eg, quantum computing); quantum chaos; "Welcher Weg" discussions; semiclassical limits. It is also of importance in signal processing. Nevertheless, a remarkable aspect of its internal logic, pioneered by Moyal, has only emerged in the last quarter-century: It furnishes a third, alternative, formulation of Quantum Mechanics, independent of the conventional Hilbert Space, or Path Integral formulations. In this logically complete and self-standing formulation, one need not choose sides--coordinate or momentum space. It works in full phase-space, accommodating the uncertainty principle. This is an introductory overview of the formulation with simple illustrations.Comment: LaTeX, 22 pages, 2 figure

A Further Approach in Omnichannel LSQ, Satisfaction and Customer Loyalty

Purpose - The purpose of this research is to analyse the LSQ in the context of three different omni-channel purchasing scenarios while considering four dimensions (timeliness, availability, condition and return of the product) and to assess their impact on customer satisfaction and loyalty. In addition, an evaluation of the relationship between satisfaction and loyalty in the mentioned omni-channel scenarios is investigated. Design/methodology/approach - A mixed two-phase research methodology is proposed: an initial qualitative analysis with six focus groups followed by quantitative research through surveys with a sample of 323 individuals. The proposed scales were tested for three purchase scenarios: 'buy-online-ship-direct' (BOSD), 'buy-online-pickup-in-store' (BOPS) and 'buy-in-store-ship-direct' (BSSD). The data were analysed using partial-least squares structural equation modelling (PLS-SEM) techniques. Findings - In an omni-channel context, the most important element of the logistics service deriving in satisfaction was timeliness for all the scenarios. The return-of-product dimension of LSQ was relevant for satisfaction in 'ship-direct' scenarios, while the availability dimension was only relevant for customer loyalty in the BOPS scenario. Customer satisfaction had a positive impact on loyalty in the three purchasing scenarios. Practical implications - These results might provide guidance to managers in order to improve not only logistics procedures and processes but also their relationships with their customers. Moreover, retailers need to account for return policies in ship-direct channels, prioritize punctuality and adapt delivery terms to ensure product availability. Originality/value - This work represents a progress in LSQ research in the B2C omni-channel environment by extending its study to a previously untested purchasing scenario (BOSD) and including a fundamental and insufficiently explored dimension of the LSQ: the return. Keywords Logistics service quality, Omnichannel, Loyalty, Satisfaction, Retailing, Retur

Dynamical description of the buildup process in resonant tunneling: Evidence of exponential and non-exponential contributions

The buildup process of the probability density inside the quantum well of a double-barrier resonant structure is studied by considering the analytic solution of the time dependent Schr\"{o}dinger equation with the initial condition of a cutoff plane wave. For one level systems at resonance condition we show that the buildup of the probability density obeys a simple charging up law, $| \Psi (\tau) / \phi | =1-e^{-\tau /\tau_0},$ where $\phi$ is the stationary wave function and the transient time constant $\tau_0$ is exactly two lifetimes. We illustrate that the above formula holds both for symmetrical and asymmetrical potential profiles with typical parameters, and even for incidence at different resonance energies. Theoretical evidence of a crossover to non-exponential buildup is also discussed.Comment: 4 pages, 2 figure

Colaboración en la dirección estratégica: ¿Cómo la gerencia moderna logra el éxito organizacional?

1 archivo PDF (10 páginas). magyeaddRESUMEN: Los retos y costos de las actividades en un mundo global han ido incrementándose día tras día, por ello, las organizaciones se orientan al establecimiento de relaciones comerciales diferentes a las formas tradicionales basadas en la adquisición de bienes y servicios en el mercado. Esta situación toma fuerza a partir de la década de los ochenta, cuando los entornos organizacionales se volvieron cada vez más complejos e inciertos. En esos momentos las organizaciones se vieron obligadas a obtener materias primas, habilidades, innovación, financiamiento o acceso a mercados mediante estrategias que les permitieran seguir creciendo, estrategias basadas principalmente en la colaboración con otras organizaciones. Esta situación requiere que las organizaciones compartan recursos y actividades para poder alcanzar sus objetivos particulares. Varias son las formas de colaboración organizacional, entre las que se pueden mencionar las alianzas estratégicas, las aventuras conjuntas, y las redes organizacionales (networks). Estás últimas consisten en acuerdos mediante las cuales dos o más organizaciones buscan obtener resultados que de manera individual no pudieran lograr, relación basada en la confianza, comunicación y el compromiso mutuo. En general, en este artículo se analiza la importancia actual de la dirección estratégica, así como la necesidad que tienen las organizaciones de colaborar para poder sobrevivir en un mundo complejo, global y cada día más demandante. ABSTRACT: The challenges and costs of activities in a global world have been increasing day by day, therefore, organizations are geared to the establishment of different trade relations to traditional forms based on the acquisition of goods and services in the market. This situation takes strength from the eighties, when the organizational environment became increasingly complex and uncertain. At that time the organizations were forced to obtain raw materials, skills, innovation, financing or market access through strategies that enable them to continue to grow, mainly based strategies in collaboration with other organizations. This situation requires organizations to share resources and activities to achieve their particular goals. There are several forms of organizational collaboration, among which may be mentioned strategic alliances, joint adventures, and organizational networks (networks). You are latter consist of agreements whereby two or more organizations seek to obtain results that individually could not achieve, relationship based on trust, communication and mutual commitment. In general, in this article the current importance of strategic direction as well as the need for organizations to collaborate to survive in a complex world, global and more demanding every day is analyzed. PALABRAS CLAVE: Organizaciones, globalización. KEYWORDS: Organizations, globalizatio

Unique continuation results for Ricci curvature and applications

Unique continuation results are proved for metrics with prescribed Ricci curvature in the setting of bounded metrics on compact manifolds with boundary, and in the setting of complete, conformally compact metrics. Related to this issue, an isometry extension property is proved: continuous groups of isometries at conformal infinity extend into the bulk of any complete conformally compact Einstein metric. Relations of this property with the invariance of the Gauss-Codazzi constraint equations under deformations are also discussed.Comment: 32 pages, supercedes math.DG/0501067; final published versio

Necesidades en salud oral de personas que viven con VIH/SIDA en Chile

Tesis (Cirujano Dentista)Objetivos: Determinar las necesidades en salud oral de personas que viven con VIH/SIDA en Chile. Materiales y métodos: Estudio cualitativo exploratorio. Se determinó cuáles son las necesidades en salud de personas que viven con VIH/SIDA mediante 2 focus group en los meses de junio y julio del 2017, con un total de 13 participantes, todos hombres entre 18 y 70 años diagnosticados con VIH positivo, pertenecientes a la Fundación Diversa. Resultados: Los resultados obtenidos se relacionan con los objetivos planteados en este estudio; Necesidad de información sobre temáticas de salud oral, Necesidad de tratamientos odontológicos y Medios de entrega de información en salud oral. Conclusión: En base a los resultados obtenidos, podemos concluir que hay una evidente necesidad de información sobre salud oral, necesidad de tratamiento odontológico integral y necesidad frente a medios de entrega de información certificados, de fácil acceso y comprensión por parte de las personas que viven con VIH/SIDA. Siendo esto de relevancia en la salud pública, ya que actualmente la población que vive con esta condición se ha incrementado en nuestro país y sus necesidades en salud oral no han sido determinadas, limitándolos a recibir una atención de salud integral y multidisciplinaria.Objectives: To determine the oral health needs of people living with HIV / AIDS in Chile. Materials and methods: Qualitative exploratory study. We determined the health needs of people living with HIV / AIDS through 2 focus groups in the months of June and July 2017, with a total of 13 participants, all men between 18 and 70 years diagnosed with HIV positive, belonging to the Diversa Foundation. Results: The results obtained relate to the objectives proposed in this study; Need for information on oral health issues, need for dental treatments and means of delivery of information in oral health. Conclusion: Based on the results obtained, we can conclude that there is a clear need for information on oral health, the need for comprehensive dental treatment and the need for certified means for delivery of information, easily accessible and understood by the people who live with HIV / AIDS. This being of relevance in public health, since currently the population living with this condition has increased in our country and their oral health needs have not been determined, limiting them to receive comprehensive and multidisciplinary health car

Time scale of forerunners in quantum tunneling

The forerunners preceding the main tunneling signal of the wave created by a source with a sharp onset or by a quantum shutter, have been generally associated with over-the-barrier (non-tunneling) components. We demonstrate that, while this association is true for distances which are larger than the penetration lenght, for smaller distances the forerunner is dominated by under-the-barrier components. We find that its characteristic arrival time is inversely proportional to the difference between the barrier energy and the incidence energy, a tunneling time scale different from both the phase time and the B\"uttiker-Landauer (BL) time.Comment: Revtex4, 14 eps figure

Tunneling dynamics in relativistic and nonrelativistic wave equations

We obtain the solution of a relativistic wave equation and compare it with the solution of the Schroedinger equation for a source with a sharp onset and excitation frequencies below cut-off. A scaling of position and time reduces to a single case all the (below cut-off) nonrelativistic solutions, but no such simplification holds for the relativistic equation, so that qualitatively different ``shallow'' and ``deep'' tunneling regimes may be identified relativistically. The nonrelativistic forerunner at a position beyond the penetration length of the asymptotic stationary wave does not tunnel; nevertheless, it arrives at the traversal (semiclassical or B\"uttiker-Landauer) time "tau". The corresponding relativistic forerunner is more complex: it oscillates due to the interference between two saddle point contributions, and may be characterized by two times for the arrival of the maxima of lower and upper envelops. There is in addition an earlier relativistic forerunner, right after the causal front, which does tunnel. Within the penetration length, tunneling is more robust for the precursors of the relativistic equation