Computation of the electron beam quality kQ,Q0k_{{\rm Q,Q}_0} factors for the NE2571, NE2571A and NE2581A thimble ionization chambers using PENELOPE

The quality correction factor $k_{Q,Q_{0}}$ for electron beams was calculated for three thimble ionization chambers, namely, NE2571, NE2571A and NE2581A. The Monte Carlo code PENELOPE was used to estimate the overall correction factor $f_{\rm c,Q}$ of these chambers for electron beams with nominal energies ranging between 6 and 22 MeV, corresponding to a Varian Clinac 2100 C/D. A $^{60}$Co beam was used as reference quality ${\rm Q}_0$. Also eight monoenergetic electron beams reproducing the quality index $R_{50}$ of the Clinac beams were considered. The $k_{Q,Q_{0}}$ factors were calculated as the ratio between $f_{\rm c,Q}$ and $f_{{\rm c,Q}_0}$. Those obtained for the NE2571 ionization chamber show a nice agreement with those calculated by Muir and Rogers with EGSnrc. As it occurred to other ionization chambers analyzed in previous works, the $k_{{\rm Q,Q}_0}$ factors found for the monoenergetic beams are larger (smaller) than those corresponding to the Clinac beams at low (high) $R_{50}$ values, the differences being slightly above $0.5\%$. Finally, the $k_{{\rm Q,Q}_0}$ factors obtained in the case of the NE2571A chamber are systematically ~0.5% below those of its predecessor chamber, the NE2571.Comment: 8 pages, 2 figures, 3 table

On Pillai’s problem with X-coordinates of Pell equations and powers of 2 II

In this paper, we show that if (X_n, Y_n) is the nth solution of the Pell equation X^2−dY^2= ±1 for some non-square d, then given any int eger c, the equation c = X_n−2^m has at most 2 integer solutions (n, m)withn ≥ 0andm ≥ 0, except for the only pair (c, d)=(−1, 2). Moreover, we show that this bound is optimal. Additionally, we propose a conjecture about the number of solutions of Pillai’s problem in linear recurrent sequences

Prioritization of Alternative Agricultural Products Based on Market Signals as a Tool for the Development of Innovative Projects

The Decentralized Autonomous Government of the province of Chimborazo promotes the agricultural productive development of the province by promoting entrepreneurship, and improving the capacities of producers, access to production factors, and integration of actors and subjects of agriculture and management on the basis to strategic planning. The construction of the Chimborazo Competitiveness Agenda was a participatory process that identified opportunities to improve the agricultural sector, where agricultural production at the primary level was recognized as a vocation and strength of the province; however, a strategic necessity was to establish possibilities of adding value and diversifying agricultural production. The definition of a set of agricultural products with high potential at the primary level and/or in agroindustrial processes that are not deeply explored required determining market signals to identify new medium- and long-term commercial possibilities for Chimborazo farmers. Additionally, it was recognized that the management of the province of Chimborazo was based on its management of the Millennium Development Goals, the Constitution of the Republic, the National Plan for Development in a Supra-Provincial Framework, as well as the Plan Development of Chimborazo, the Territorial Planning Plan and others that promoted planning with a focus on territorial and solidarity sustainable development. Keywords: Chimborazo, productive development, entrepreneurship, agricultural sector. Resumen El Gobierno Autónomo Descentralizado de la Provincia de Chimborazo impulsa el fomento productivo agrícola de la provincia mediante la promoción del emprendimiento, el mejoramiento de las capacidades de los productores, acceso a factores de producción, integración de los actores y sujetos del agro y gestión en base a una planificación estratégica. Como parte de dicho accionar, la construcción de la Agenda de Competitividad Chimborazo fue un proceso participativo que identificó oportunidades para mejorar el sector agrícola, donde se reconoció la producción agrícola a nivel primario como una vocación y fortaleza de la provincia, no obstante, una necesidad estratégica fue el establecer posibilidades de agregación de valor y de diversificar la producción agrícola. La definición de un conjunto de productos agrícolas con alto potencial a nivel primario y/o en procesos agroindustriales que no están profundamente explorados requirió determinar señales de mercado para identificar posibilidades comerciales nuevas a mediano y largo plazo para los agricultores de Chimborazo. Adicionalmente, se reconoció que la gestión de la provincia de Chimborazo tuvo como base los Objetivos del Milenio, la Constitución de la República, el Plan Nacional de Desarrollo en un marco supra-provincial, así como el Plan de Desarrollo de Chimborazo, el Plan de Ordenamiento Territorial y otros en su conjunto que promovieron una planificación con un enfoque de desarrollo sostenible territorial y solidario. Palabras clave: Chimborazo, fomento productivo, emprendimiento, sector agrícola

Forest loss during 2000–2019 in pygmy hippopotamus (Choeropsis liberiensis) habitats was driven by shifting agriculture

DATA SHARING : Google Earth Engine code for the analyses are accessible through Zenodo: https://doi.org/10.5281/zenodo.7091804 (Erazo Mera, Younes Cárdenas, Murray, 2022). All Sentinel-2 imagery is publicly available via Sentinel Hub: https://sentinel.esa.int/web/sentinel/sentinel-data-access or through Google Earth Engine.Please read abstract in the article.A James Cook University Postgraduate Research Scholarship, HDRES Grant and an Australian Research Council Discovery Early Career Research Award.https://www.cambridge.org/core/journals/environmental-conservationhj2024Mammal Research InstituteSDG-15:Life on lan

Sociologia rural na Amazônia: relação entre gênero e escolaridade de agricultores familiares no Lago Janauacá, Careiro Castanho-AM.

A dinâmica da população rural é um objeto de discussão precedente aos anos noventa. Elementos como o envelhecimento da população, gênero, escolaridade e a migração, entre muitos outros, têm se tornado subsídios importantes a serem considerados na formulação de políticas públicas e implementação de ações para o fortalecimento da agricultura familiar no Brasil. O presente estudo realizado na região do lago Janauacá, município de Careiro - AM, utilizou a pesquisa exploratória com a finalidade de alcançar uma maior interação com o problema, com vistas a torná-lo mais explícito ou constituir hipóteses, além de contribuir para aprimorar ideias. Buscamos com esta pesquisa construir e caracterizar uma relação entre o gênero e a escolaridade dos agricultores familiares da região do lago Janauacá, Careiro (AM)

Variante morfológica de adultos hembras de Anopheles benarrochi (Diptera: Culicidae) en Putumayo, Colombia

A survey of Anopheles mosquitoes was undertaken in Putumayo, southern Colombia, to clarify the identity of specimens classified as Anopheles (N) evansae in the region. Female anophelines were captured on human bait; then blood fed on small mammals to obtain eggs for progeny broods. Morphological characteristics of the eggs. larvae, pupae and adults of both sexes, including male genitalia were examined. Eggs were obtained from 247 females provisionally identified as A. (N.) evansae Morphology of associated life stages of the progeny broods was compared among 27 families. The morphology of al1 stages corresponded to the published descriptions of Anopheles (N.) benarrochi. However, morphologically variable adult females were noted. In hind tarsomere 2, the dark portion ranged from 0.17 to 0.33 of the tarsomere length; this is less than previously reported for A. (N) benarrochi and overlaps the ranges described for A. (N,) oswaldoi and A. (N) evansae This variable character probably has led to incorrect identifications of adult A. (N.) benarrochifemales as A. (N.) evansae or A. (N.) oswaldoi in specimens from southern Colombia. As a consequence, A. (N) benarrochi has not been previously recognized in Putumayo, and probably has been misidentified in other areas of northwestern South America.Con el propósito de ampliar el conocimiento sobre las especies de Anopheles presentes en el Putumayo, sur de Colombia, y para esclarecer la identidad de los ejemplares clasificados como Anopheles (Nyssorhynchus) evansae en esta región, se recolectaron mosquitos hembra en cebo humano, se alimentaron en pequeños mamíferos y se mantuvieron vivos para la cría de isofamilias. Se realizaron observaciones de las características morfológicas de los huevos, larvas, pupas y adultos de ambos sexos, incluidas las genitalias masculinas. Se obtuvieron 247 posturas de madres identificadas preliminarmente como A. (N) evansae A 27 de estas familias se les estudió la morfología de los estadios asociados. Todos los especimenes fueron subsecuentemente identificados como Anopheles (N) benarrochi por la morfología de los huevos, larvas, pupas y genitalias masculinas, lo cual coincidió con las descripciones publicadas para esta especie. Sin embargo, los adultos hembra de Putumayo presentaron la proporción oscura en el tarsómero posterior 2, entre 0.17 y 0.33 de su longitud, inferior a lo informado para esta especie, lo cual se superpone con los rangos de Anopheles (N.) oswaldoi y A. (N.) evansae. Como resultado de la superposición en este carácter, es probable que hembras adultas de A. (N.) benarrochi hayan sido incorrectamente identificadas como A. (N) evansae y A. (N.) oswaldoi en el sur de Colombia. La presencia de esta variante morfológica ha dificultado la identificación de A. (N.) benarrochi en Putumayo y, probablemente, en otras regiones de Colombia y paises vecinos

A importância da mulher na agricultura familiar: comunidade Lago Janauacá, Careiro Castanho-AM.

O Objetivo desse trabalho é apresentar uma discussão a respeito do papel da mulher na agricultura familiar da região Amazônica