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2018
Ciencia Ergo Sum
Determinación de factores de enriquecimiento y geoacumulación de Cd, Cr, Cu, Ni, Pb, y Zn en suelos de la cuenca alta del río Lerma2005 •
The present study aimed at determined a regional geoaccumulation index (I geo) and enrichment factor (EF) in soils irrigated in the upper basin of the Lerma river, Mexico State. Fifty five soils samples were collected in five localities: Tlachaloya, Ixtlahuaca, Atlacomulco, Temascalcingo and Amealco. The chemical properties analyzed were pH, clay, organic matter, Cr, Ni, Zn, and Pb contents, I geo and FE. According to the ph and MO values the soils are excellent for agricultural use. The contents of heavy metals are lower than the permissible limits. The enrichment factor indicates that the Pb is a moderate contaminant having geological and anthropocentric origins. The I geo values show that Pb and Ni are the highest contaminants for the soil.
In this work will be presented the general developments of Trefftz-Herrera Collocation Method for the parabolic equation of second order due to the advection-difusion equation, also well known as transport equation in ground water contaminant modeling, is of this type. To this end will be considered an appropriate discretization of the derivative in time using a Theta finite difference approximation scheme. Then, will be applied the general formulation of Trefftz-Herrera Method to resulting elliptic equation for each time step using cubic weighting functions. In particular, the construction of weighting functions is done applying orthogonal collocation method, in this sense the collocation is applied in an indirect manner. The resulting numerical procedure is simpler and in consequence more efficient comparing to usual standard collocation methods. RESUMEN En el presente trabajo haremos el desarrollo general del Método de Colocación Trefftz-Herrera para el caso de la ecuación parabólica de segundo orden puesto que la ecuación de advección-difusión, también conocida como ecuación de transporte en la modelación de contaminantes en aguas subterráneas, es de este tipo. Su obtención se hará a partir de considerar una discretización apropiada de la derivada en el tiempo usando un esquema en diferencias finitas del tipo Theta. Se aplica la formulación general del Método Trefftz-Herrera a la ecuación elíptica resultante para cada paso del tiempo usando funciones de pesos cúbicas. En particular las funciones de peso se construyen usando colocación ortogonal, de ahí que la aplicación del método de colocación sea indirecta. El esquema numérico que se obtiene resulta más simple y por tanto más eficiente comparado con los métodos de colocación tradicional.
Tesis Doctorado, Estudios del Desarrollo Rural, Colegio de Postgraduados
Burocracia hidráulica y transferencia: el caso del Distrito de Riego 011 Alto Río Lerma, Guanajuato2006 •
2016 •
2023 •
The extreme antisemitism of Hamas is at the root of the recent atrocities against Israeli civilians.
Journal of Neolithic Archaeology
Studying Neolithic lithics -from a cross-border dialogue to a common languageŠiaurietiški atsivėrimai
Saločių mūšio vietos beieškant: Naujausi archeologiniai radiniai2023 •
Маркетингът – опит и перспективи Сборник с доклади от Международна научна конференция, посветена на 20 години от създаването на катедра Маркетинг при Икономически университет – Варна, България, 29-30 Юни 2017 г. ISBN: 978-954-21-0931-0
МАРКЕТИНГ НА СЪДЪРЖАНИЕТО И БИЗНЕС РАЗВИТИЕ. CONTENT MARKETING AND BUSINESS DEVELOPMENT2017 •
Transport and Communications
Traffic Congestion and Intelligent Transport System in a Fast-growing Nigeria City2020 •
2023 •
Santiago: Editorial Universitaria / DIBAM, Centro de Investigaciones Diego Barros Arana, 2020, pp. 11-13
[Presentación a la edición en español] Eduardo França Paiva, "Nombrar lo nuevo. Una historia léxica de Iberoamérica entre los siglos XVI y XVIII (las dinámicas de mestizajes y el mundo del trabajo) (Santiago, 2020)Mersin Üniversitesi Tıp Fakültesi Lokman Hekim Tıp Tarihi ve Folklorik Tıp Dergisi
Meme Kanseri ve Aromaterapi2021 •
2023 •
2017 •
2017 •
Теоретическая и математическая физика
Вещественные гамильтоновы формы аффинных теорий поля Тоды: спектральные аспекты2022 •
Energy Procedia
Climate adaptation of buildings through MOM- and upgrading - State of the art and research needs2017 •
Chapman & Hall/CRC Cryptography and Network Security Series
Handbook on Soft Computing for Video Surveillance2012 •
Indian journal of community medicine : official publication of Indian Association of Preventive & Social Medicine
Linkages between Hypertension and Coronary Heart Disease in India: Evidence from India Human Development Survey-2 (2011-2012)2022 •
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Multi-Modal Digital Documentation and Visualization of the Unesco Painted Churches in Troodos (Cyprus)Journal of Pharmacognosy and Phytochemistry
Effects of conservation tillage and nitrogen management on soil properties, crop productivity and nitrogen use efficiency of irrigated rice under North West India2018 •
Humanities and Social Sciences Communications
The factors associated with teachers’ job satisfaction and their impacts on students’ achievement: a review (2010–2021)