A1A_1 theory of weights for rough homogeneous singular integrals and commutators

Quantitative $A_1-A_\infty$ estimates for rough homogeneous singular integrals $T_{\Omega}$ and commutators of $BMO$ symbols and $T_{\Omega}$ are obtained. In particular the following estimates are proved: % $$\|T_\Omega \|_{L^p(w)}\le c_{n,p}\|\Omega\|_{L^\infty} [w]_{A_1}^{\frac{1}{p}}\,[w]_{A_{\infty}}^{1+\frac{1}{p'}}\|f\|_{L^p(w)}$$ % and % $$\| [b,T_{\Omega}]f\|_{L^{p}(w)}\leq c_{n,p}\|b\|_{BMO}\|\Omega\|_{L^{\infty}} [w]_{A_1}^{\frac{1}{p}}[w]_{A_{\infty}}^{2+\frac{1}{p'}}\|f\|_{L^{p}\left(w\right)},$$ % for $1<p<\infty$ and $1/p+1/p'=1$.Comment: 19 page

Integrated Web Accessibility Guidelines for Users on the Autism Spectrum - from Specification to Implementation

This research presented a compendium of web interface design guidelines and their implementation on a transport-planning website based on the needs and preferences of users on the autism spectrum. Results highlighted the importance of having simple navigation and meaningful headings, icons, labels and text to facilitate understanding and readability; these findings offer guidelines for the design of web user interfaces to continue improving the web experience of autistic users, and therefore of the whole community

DIPL 1711 AE Introduction to International Relations

This course is an introduction to the field of International Relations -its basic concepts, theories and central concerns such as war and peace, conflict and cooperation and poverty and prosperity. The course will provide you with an understanding of the basic concepts in the field, including sovereignty and globalization and power and interdependence. We will examine different levels of analysis that structure this inquiry, and learn the different ways in which scholars of global politics explain the evolution and functioning of the international system. The course will focus on the nation-state, historically the primary actor in IR, as well as examine the growing role of non-state actors, including non-governmental organizations (NGOs), and Inter-governmental Organizations (IGOs). Students will develop a basic understanding of different theoretical approaches and utilize these lenses to explain international events, applying this knowledge to explain and understand the foreign relations of specific countries in the international system. As a course designed to meet the Oral Communication Proficiency, students will also be expected to demonstrate and hone oral and written communications skills

Heuristic remedial actions in the reliability assessment of high voltage direct current networks

Planning of high voltage direct current (HVDC) grids requires inclusion of reliability assessment of alternatives under study. This paper proposes a methodology to evaluate the adequacy of voltage source converter/VSC-HVDC networks. The methodology analyses the performance of the system using N-1 and N-2 contingencies in order to detect weaknesses in the DC network and evaluates two types of remedial actions to keep the entire system under the acceptable operating limits. The remedial actions are applied when a violation of these limits on the DC system occurs; those include topology changes in the network and adjustments of power settings of VSC converter stations. The CIGRE B4 DC grid test system is used for evaluating the reliability/adequacy performance by means of the proposed methodology in this paper. The proposed remedial actions are effective for all contingencies; then, numerical results are as expected. This work is useful for planning and operation of grids based on VSC-HVDC technology

Análisis tributario y contable de las resoluciones de intendencia improcedentes en la solicitud del SFMB y su efecto en la liquidez, caso: Agrícola SAC 2020 – 2021

Las empresas exportadoras tienen la ayuda de solicitar el saldo a favor materia de beneficio para poder mejorar la liquidez, para el caso de AGRICOLA SAC, SUNAT le viene emitiendo las Resoluciones de Intendencia Denegatorias, lo cual genera un retraso en dicha solicitud, el objetivo de esta investigación es analizar tributaria y contablemente las Resoluciones de Intendendencia Denegatorias, y su incidencia en la liquidez de la empresa, se ha reunido la información contable y tributaria de la empresa, mediante cuestionarios al personal encargado de la contabilidad, tablas comparativas, hojas de cálculo en Excel y análisis de la liquidez de los estados financieros, dentro de los resultados encontrados, la empresa vienen presentando desde el año 2019 la solicitud del Saldo a Favor Materia de Beneficio sin tener éxito, tiene acumulado 5 resoluciones de Intendencia Denegatorias, del análisis a las resoluciones se determinó que en su gran mayoría eran errores de digitación del llenado del PDB- Exportadores, como conclusión general la empresa comete errores al momento de llenar el PDB-Exportadores, algunos son sencillos y pueden ser subsanados, SUNAT es muy estricta al momento determinar sus observaciones y no da oportunidad a las empresas para sustentar las inconsistencias, se recomienda a la empresa realizar un exhaustiva revisión de su información y no dejar pasar tanto tiempo en volver a solicitar la devolución

Evaluation of Seawater Intrusion using Electrical Resistivity Surveys and Geochemical Measurements in Brazoria County, Texas

Seawater intrusion is one of the world's leading causes of groundwater contamination in coastal aquifers. In the United States, relatively little research has been conducted in the Gulf Coast Region bordering the state of Texas, even though the coastal zones of this state have been rendered potentially vulnerable to seawater intrusion. Furthermore, most investigations of saltwater intrusion processes globally have focused on numerical modeling experiments and sand-tank experimentations, which highlight the need to acquire reliable geologic information about an aquifer system, and the potential saltwater-freshwater interfaces present in it. Field investigations from geophysical and geochemical approaches present a valid effort to provide an improved spatial understanding of seawater intrusion in coastal aquifers, and a scientific basis for decision-makers and groundwater stakeholders to take appropriate actions for the benefit of water resources and their direct impact on people’s lives. This study applies electrical resistivity surveys to image the subsurface in Brazoria County, a site selected by analyzing available salinity data of water wells in Texas. Geophysical measurements were collected by using two transects covering the distance between a zone with wells that displayed high and low TDS in the study area, as well as an additional transect located in the surrounding area of a water well that was sampled for this study. Eight groundwater wells were sampled, and geochemical analyses were employed to calibrate and expand the results obtained with the electrical resistivity tomography (ERT). Geochemical indicators of seawater intrusion, such as elevated levels of SpC, sodium, and chloride concentrations were detected in the study area, especially in the regions closer to the coastline. Resistive and conductive structures were found at depth; therefore, the application of ERT in this study proves to be an effective tool in characterizing the subsurface in this region and assessing seawater intrusion, leading to an improved understanding of the spatial distribution of freshwater and saline water that was unattainable with the previously deployed techniques. Further investigation is recommended to characterize the subsurface in this region by employing ERT in additional locations, counteracting the effects of spatial variability and informing groundwater practitioners more accurately, with the objective of taking appropriate actions to protect and manage water resources

Revitalizar el territorio, revitalizar la lengua: El caso del Zapoteco Coateco de Oaxaca, México

En este artículo se presentan algunos resultados de un proyecto comunitario de revitalización cultural y lingüística del zapoteco coateco o di´zhke´, mediante el taller “Voces de Nuestros Cerros”, mismo que se viene desarrollando desde el 2018 en el Municipio de San Jerónimo Coatlán, en la zona zapoteca de la sierra sur de Oaxaca, México. Se parte del supuesto de que la relación lengua y territorio es tan profunda de que lo uno impacta inevitablemente en lo otro, de manera que, aunque en este escenario, el zapoteco coateco dejó de hablarse hace más de tres décadas, aún es viable su revitalización en tanto que el territorio mantiene una importante continuidad. La metodología empleada en este trabajo es con base en una etnografía colaborativa en el marco de una investigación doctoral. Finalmente, algunos resultados muestran que efectivamente es posible el despertar del zapoteco coateco pero previo a una revitalización lingüística como tal es necesario fortalecer algunos aspectos relacionados con los conocimientos territoriales así como cuestiones de identidad cultural, lo cual hemos estado trabajando en los últimos años. In this piece, results are presented for the cultural and linguistic revitalization of Coateco Zapotec, or di´zhke´, community project through the workshop “Voces de Nuestros Cerros” (“Voices from our hills”), which has been developing since 2018 in the San Jeronimo Coatlan municipality, in the Zapotec region at the Sierra Sur in Oaxaca, Mexico. The starting assumption is that language and territory are so deeply related that inevitably one impacts the other, therefore, though in these circumstances the Coateco Zapotec is no longer spoken since more than three decades ago, its revitalization is still feasible while the territory keeps an important continuity. The methodology used in this work is based in a collaborative ethnography in the context of a doctoral research. Finally, some results show that, in effect, it is possible to wake the Coateco Zapotec but before doing linguistic revitalization as such, it is necessary to strengthen some aspects related to territory knowledge as well as cultural identity issues, on which we have been working during the last years

CREACIÓN Y OPTIMIZACIÓN DE UN PORTAFOLIO DE INVERSIÓN PARA UNA SOCIEDAD DE INVERSIÓN DE RENTA VARIABLE

Un portafolio de inversión creado bajo la metodología de Markowitz tiene un riesgo menor y un rendimiento mayor que un portafolio de inversión aleatorio. La estructura de este trabajo consta de cuatro capítulos. En el primero se hablara del Sistema Financiero Mexicano, su integración, regulación, funciones etc. El segundo capítulo, se hablará de manera específica sobre las sociedades de inversión, como se constituyen, su clasificación y demás aspectos generales sobre ellas. Para el tercer capítulo, se presenta la teoría que se utiliza en la creación y optimización del portafolio, que es la llamada Teoría del Portafolio de Markowitz. En el cuarto capítulo, se verá la aplicación del modelo de Markowitz, en donde se pondrá en práctica el fundamento teórico del capítulo 3, esto con el fin de crear el portafolio óptimo

Diseño de la trocha carrozable San Francisco-Chontabamba-Lascan, distrito de Conchán, provincia de Chota, departamento de Cajamarca, 2022

Mediante la presente tesis se plantea el diseño una trocha carrozable, que beneficiara los caseríos de San Francisco, Chontabamba y Lascan ubicadas en el distrito de Conchan, provincia de Chota en la región de Cajamarca. Por consiguiente, se ha llevado a cabo todos los estudios de ingeniería propios de una carretera, teniendo como base los manuales vigentes publicados por el Ministerio de Transportes y Comunicaciones (MTC). Según la clasificación por demanda, la carretera se le diseñara como una trocha carrozable, con un ancho de calzada 4 metros y con plazoletas cada 500 metros. La longitud de apertura es de 14.69 kilómetros, la cual será mejorado con afirmado. La vía contara con obras de arte, cuyo propósito es facilitar el drenaje de las aguas de lluvia, y en efecto mantener y prolongar su vida útil. Finalmente, mediante el estudio de impacto ambiental, se analizó los posibles impactos positivos y negativos que generara la puesta en marcha de este proyecto