Results 61 to 70 of about 297,608 (270)

A guide to field stations in the tropics : I. Mexico [PDF]

, 2013
Herbaria: The National Council for the Flora of Mexico (Consejo Nacional de la Flora de México) recently published a revised edition of the catalogue of Mexican herbaria (Arreguín & Valenzuela 1986). This contains information on 58 institutional herbaria
Delgadillo M., Claudio
core  

Homotopy Invariants and Time Evolution in (2+1)-Dimensional Gravity

, 1994
We establish the relation between the ISO(2,1) homotopy invariants and the polygon representation of (2+1)-dimensional gravity. The polygon closure conditions, together with the SO(2,1) cycle conditions, are equivalent to the ISO(2,1) cycle conditions ...
A. Achucarro, A. Anderson, A. Anderson, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Ashtekar, A. Hosoya, B. S. DeWitt, C. Rovelli, E. Witten, Federico Zertuche, G. 't Hooft, G. T. Horowitz, H. Poincaré, H. Waelbroeck, H. Waelbroeck, H. Waelbroeck, H. Waelbroeck, H. Waelbroeck, H. Waelbroeck, Henri Waelbroeck, J. D. Brown, J. E. Nelson, J. E. Nelson, J. E. Nelson, J. E. Nelson, J. Soda, J. York, K. Kuchacheck r, L. F. Urrutia, L. F. Urrutia, P. A. M. Dirac, R. A. Matzner, R. Arnowitt, S. Carlip, S. Carlip, S. Carlip, S. Carlip, S. Deser, S. Deser, S. Deser, T. Jacobson, V. Moncrief, V. Moncrief   +44 more
core   +1 more source

Sceloporus jalapae [PDF]

, 2008
Number of Pages: 5Integrative BiologyGeological ...
Chiszar, David, Flores-Villela, Oscar, Liner, Ernest A., Smith, Hobart M.   +3 more
core   +1 more source

Can ISO/IEC 17025 serve as a tool to prevent scientific fraud in chemical research laboratories?

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Scientific fraud has been documented across multiple disciplines, and chemistry is no exception. Recent studies indicate that contamination of materials, methodological errors, and unreliable data, results, or analyses account for over 25% of retracted publications.
Flor Monica Gutierrez‐Alcantara
wiley   +1 more source

Mapping the Landscape of Space Sciences in Latin America: a Bibliometric Study of Productivity and Collaboration in Mexico, Brazil, Argentina, and Chile

Geofísica Internacional
This paper presents a regional bibliometric study of space sciences in Latin America. The research is conducted in solar physics, magnetospheric physics, physics of solar-terrestrial relationships, cosmic ray physics, and planetary physics, over a 20 ...
A. A. Nicolás-Pablo, María Dolores Maravilla Meza, J. L. Olivares-Vázquez, Graciela Herrera-Zamarrón   +3 more
doaj   +1 more source

Debate sobre teoría económica: a propósito de Moneda y teoría del valor de Carlo Benetti

Lecturas de Economía, 2010
Intervención de Ángel de la Vega Navarro, 89. Intervención de Carlo Benetti, 90. Comentarios del Dr. Alejandro Nadal, 100. Intervención del Dr. Juan Castaingts, 103. Comentario del Dr. Alejandro Valle Baeza, 108.
Doctorado de Ciencias Económicas UNAM
doaj   +1 more source

Young and very young stars in NGC 3372, the Carina nebula [PDF]

, 2004
Results are presented of a large-scale imaging photometric study of the stellar population in the northern part of NGC 3372 with a w avelength co verage from 0.33 to 2.5 µm. All observations were made at Las Campanas Observatory .
Persi, P., Roth, M., Tapia, M., Vazquez, Ruben Angel   +3 more
core   +1 more source

Economic and environmental implications of the development of UASB reactors in Mexico for sustainable industrial wastewater treatment

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract The objective of this work is to demonstrate that the inclusion of an up‐flow anaerobic sludge bed (UASB reactor) within an industrial wastewater treatment plant reduces the plant's investment and operating costs compared to a system based solely on conventional complete‐mix activated sludge (CMAS), operating under the same design principles ...
Juan Manuel Morgan‐Sagastume, Adalberto Noyola   +1 more
wiley   +1 more source

La Universidad Nacional Autónoma de México acerca de sí misma

Revista Mexicana de Ciencias Políticas y Sociales, 2020
Todas las obras son editadas por la Universidad Nacional Autónoma de México; en su caso, se indica entre paréntesis el número que tiene el libro en cuestión en la serie de la Comisión Técnica de Legislación Universitaria, después cambiada a Comisión ...
Juan Brom
doaj   +1 more source

Revistas UNAM

, 2017
Seminario Internacional de Acceso Abierto en las Universidades Latinoamericanas 23-24 May, 2017 Lima ...
openaire   +1 more source