Vol. 27 No. 1 (2013)

Original scientific papers (evaluated by academic peers)

• Mathematics Teachers Preparation: Relevant Aspects

  Jennifer Fonseca Castro, Mario Castillo Sánchez (Author)

  2-14

  • PDF (Spanish)

• A Reality of secondary students with special needs in mathematics

  Gilberto Chavarría Arroyo, Evangelina Díaz Obando (Author)

  15-33

  • PDF (Spanish)

• Mathematics for secondary education project (Matem-UNA): perception of students about of the courses received and the profesional careers they selected for higher education

  Ana Lucía Alfaro Arce, Marianela Alpízar Vargas (Author)

  34-58

  • PDF (Spanish)

• System detection and automatic classification of pollen grain applies technical digital imaging process

  Jorge Arroyo Hernández, Carlos M. Travieso González, Jaime Ticay Rivas, Federico Mora Mora, Oscar Salas Huertas, Melvin Ramírez Bogantes, Luis Sánchez Chavez (Author)

  59-73

  • PDF (Spanish)

• The Van Hiele model and the teaching of the geometry

  Gilberto Vargas Vargas, Ronny Gamboa Araya (Author)

  74-94

  • PDF (Spanish)

• The teaching of the Pythagorean theorem: classroom experience with the use of geogebra according to Van Hiele model

  Gilberto Vargas Vargas, Ronny Gamboa Araya (Author)

  95-118

  • PDF (Spanish)

• Factótum virtual tutor for the study of the functions

  Enrique Vílchez Quesada, Juan Félix Ávila Herrera (Author)

  119-139

  • PDF (Spanish)

• Control Banding for wastes: a spreadsheet for a simple and fast comparison of impact on the enviroment of wastes with chemical substances

  José Ángel Rodríguez Corrales, Alex Horacio González Murillo, Carmen Mora Aparicio, Christopher Solís Ocampo (Author)

  140-155

  • PDF (Spanish)

• Effect of pineapple (Ananas Comosus) culture by- products on the enzymatic deproteinization of shrimp biowastes

  Javier Rodrigo Alpízar Cordero, Luis Roberto Villegas Peñaranda, Sergio Madrigal Carballo, María Sibaja Ballestero (Author)

  156-170

  • PDF (Spanish)

• Seasonal signatures in the physical properties of a tropical estuary in the Central America Pacific

  C. L. Brenes, R. Benavides, D. Ballestero (Author)

  171-185

  • PDF (Spanish)

• Chemical and technological hazards of the Great Metropolitan Area of Costa Rica

  Ricardo Sánchez-Murillo, Gilberto Piedra-Marín, Sandra León-Coto, Alexander Solís-Delgado (Author)

  186-214

  • PDF (Spanish)

• Design of a spectrofluorometric method for the determination of ethanol in air

  Rosa Alfaro Solís, Juan Valdés González, José Pablo Sibaja Brenes, Germain Esquivel Hernández (Author)

  215-231

  • PDF (Spanish)

• Nutrient uptake by leaf

  Ritma Giordana Murillo Castillo, Gilberto Piedra Marín, Ramón G. León (Author)

  232-244

  • PDF (Spanish)

• The Costa Rican Biological Sciences Olympics and their Role in the National Educational Community through the Integration of Competition, Sharing, Living and Learning

  José Pereira Chaves, Shirley Camacho Vargas, Nelson Múñoz Simonz (Author)

  245-265

  • PDF (Spanish)

• Chemical reageants management in laboratories of the Universidad Nacional

  José Carlos Mora Barrantes, David Benavides Ramírez, Gilberto Piedra Marín (Author)

  266-283

  • PDF (Spanish)

• National and international impact to promote scientific vocations with the Program for Improving the Teaching of Chemistry (PMEQ)

  Randall Syedd León, Ana Rocío Madrigal, Manuel Sandoval B., José Vega-Baudrit (Author)

  284-303

  • PDF (Spanish)

• Evaluation of the chemical composition (Phyllanthosides and Lignans) of the crude extract of the Chilillo tree (Phyllanthus Acuminatus Vahl) from different sites of Costa Rica

  Daniel Esquivel Alvarado, Gerardo Rodríguez Rodríguez, Sergio Madrigal Carballo (Author)

  304-318

  • PDF (Spanish)

• Wastewater treatment in a small domestic-productive unit, using alternative technologies

  Cynthia Pérez Rodríguez, Juana María Coto Campos, Viviana Salgado Silva, Jacqueline Herrera Núñez, José Francisco Fernández Araya, Cristina Benavides Benavides (Author)

  319-331

  • PDF (Spanish)

• Performance evaluation of an alternative artificial wetlands system used as wastewater treatment

  Roy Pérez Salazar, Carolina Alfaro Chinchilla, Jihad Sasa Marín, Juan Agüero Pérez (Author)

  332-340

  • PDF (Spanish)

• Comparison between recursive and iterative algorithms, and its measurement in terms of efficiency

  Juan de Dios Murillo Morera, Santiago Caamaño Polini (Author)

  341-350

  • PDF (Spanish)

• Agriculture pesticides use as tool for monitoring health hazards

  Virya Bravo Durán, Elba de la Cruz Malavassi, Gustavo Herrera Ledezma, Fernando Ramírez Muñoz (Author)

  351-376

  • PDF (Spanish)