Repositorio Nacional

With the implementation of the Official Mexican Standard NOM-011-CONAGUA-2000, the water balance of 730 basins has been calculated and its water availability agreement is published. This rule points out to allocate water for the environment only as an annual volume since methods for estimating environmental flows were not standardized in the country. In this paper, an analysis of the environmental flow standard and examples of the suggested hydrological methods are presented. For its implementation, some steps are taking place, mainly establishing environmental water reserves and building capacities. In addition, environmental allocations are becoming a common practice for all water projects, as well as setting limits to hydrological alterations by hydroelectric dams. The standard promotes the use of technical integration tools to analyze the responses of ecosystems to changes in the flow regime and adaptive management under different scenarios of water use. Although the main steps have been taken, its implementation as mandatory rule will take time.

Flujos ambientales Modelos hidrológicos Normas técnicas BIOLOGÍA Y QUÍMICA

Editorial: Conservation agriculture: knowledge frontiers around the world

Stéphane Cordeau ML JAT Cameron Pittelkow Christian Thierfelder (2023, [Artículo])

No-Tillage Direct Seeding Cover Crops Crop Diversification CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA COVER PLANTS DIVERSIFICATION CROPPING SYSTEMS DIRECT SOWING ZERO TILLAGE

Synthesis of hollow carbon spheres by chemical activation of carbon nanoparticles for their use in electrochemical capacitor

Cesar Eduardo Sanchez Rodriguez EDUARDO TOVAR MARTINEZ MARISOL REYES REYES Luis Felipe Cházaro Ruiz ROMAN LOPEZ SANDOVAL (2022, [Artículo])

"Naphthalene combustion has been used to synthesize grams per hour of solid carbon spheres (CS). The carbon soot was activated by acid treatment consisting in a mixture of HNO3 and H2SO4 (1/3 v/v) to produce hollow carbon spheres (HCS). The effect of two concentrations of CSs (5 and 10 mg mL−1) in the acid mixture, on the physicochemical properties of the activated HCSs was studied. The HSCs were subjected to a thermal treatment to increase their graphitization to enhance their electrical conductivity. High-resolution transmission electron microscopy confirmed the formation of HCSs due to the acid treatment whereas FTIR spectra showed that the chemical activation produced functional groups on the carbon spheres surface and the heat treatment effect to remove some of them as well. A specific surface area of 300 m2 g−1 and a large density of micropores for the acid-treated CSs as well as the heat-treated CSs were estimated by analysis of N2 adsorption-desorption isotherms. A specific capacitance 70 F g−1 was calculated by cyclic voltammetry of the acid and thermally treated HCSs at 5 mV s−1, for both CS concentrations, indicating the possibility of synthesizing these HCSs using a simple method in large quantities for their use in electrochemical capacitors."

Physicochemical properties Carbon nanoparticles Chemical activation Electrochemical capacitor BIOLOGÍA Y QUÍMICA QUÍMICA QUÍMICA

Sorghum value chain analysis in semi-arid Zimbabwe

Abbyssinia Mushunje Munyaradzi Junia Mutenje Charles Pfukwa (2019, [Artículo])

Small Scale Farmers Extension Networks CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA AGRO-INDUSTRIAL SECTOR MARKETING MARGINS SORGHUM VALUE CHAINS

Implementation new tools and technologies in the GMP Africa Breeding Pipelines

Yoseph Beyene (2023, [Objeto de congreso])

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA NEW TECHNOLOGY BREEDING PIPES GERMPLASM PHENOTYPING

Climate robust soil fertility management by smallholders in Africa, Asia, and Latin America

Tek Sapkota (2023, [Objeto de congreso])

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA SOIL FERTILITY SMALLHOLDERS FERTILIZERS NUTRIENT MANAGEMENT

Conflictos hídricos: lecciones para el presente

ADRIAN PEDROZO ACUÑA (2021, [Artículo])

doi.org/10.24850/b-imta-perspectivas-2021-02

La magnitud y el número de conflictos hídricos que se están registrando en todo el mundo señalan la necesidad de utilizar el conocimiento de punta y la capacidad tecnológica y social de las instituciones de investigación para asistir a todas las personas atrapadas en conflictos hídricos. En México, tan solo el año pasado, fuimos testigos de conflictos hídricos en la cuenca del río Bravo por los volúmenes de agua compartidos en una cuenca por diversos usuarios. Estas son tan solo unas facetas de la realidad de los conflictos hídricos que se están presentando en el mundo y, sin duda, constituyen un indicador de la necesidad de nuevos paradigmas para la gestión del agua, ya que es imposible continuar aceptando el gran impacto que estas tensiones generan sobre las vidas de millones de personas y ecosistemas que dependen de los flujos de agua. Estos conflictos tienen su origen en la desecación de ríos, la sobreexplotación de acuíferos y, desde luego, la falta de atención a dimensiones sociales, como la equidad y la justicia.

Conflictos por agua Gestión del agua Explotación de recursos naturales INGENIERÍA Y TECNOLOGÍA

Contrabando y redes de negocios : Hispanoamérica en el comercio global, 1610-1814

Guillermina del Valle Pavón (2023, [Libro])

"Las colaboraciones que integran este libro colectivo profundizan en el análisis de algunos circuitos comerciales, que fueron claves en el juego de intercambios en Nueva España, Perú, las Filipinas, La Habana y Buenos Aires, en el arco temporal que se extiende de 1610 a 1814."

Hispanoamérica (Antiguo Régimen); Nueva España (Virreinato); Comercio; Comercio mundial; Comerciantes; Contrabando; Corrupción; Empresas; Mercantilismo; Monarquía hispánica; Mercaderes; Redes de negocios; Argentina; Estudios de caso; Siglos XVII-XIX; CIENCIAS SOCIALES HISTORIA HISTORIA POR ESPECIALIDADES HISTORIA POR ESPECIALIDADES