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Aproximadamente 27 registro(s) hasta el momento: (knowledge)

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Recurso libre

Earthworms as soil quality indicators: local and scientific knowledge in rice management systems
LIMA,Ana Cláudia Rodrigues de - BRÜSSAARD,Lijbert

Formato:	journal article
Enlaces:	Farmers from Camaquã, Rio Grande do Sul, Brazil, were shown to have a holistic view of the quality of the soil they are cultivating. Progress towards sustainable land management will come from the synergy of both local and formal scientific…
Fecha:	2010-01-01
Recurso:	SCIELO

Recurso libre

A Revision and Experience using Cognitive Mapping and Knowledge Engineering in Travel Behavior Sciences
León,Maikel - Nápoles,Gonzalo - García,Maria M. - Bello,Rafael - Vanhoof,Koen

Formato:	journal article
Enlaces:	All modern society investigates in the field of Travel Behavior because of the significance for all social and economical process of a country. The problems related with travel behavior are not structured; the Artificial Intelligence techniques have a high interest…
Fecha:	2010-12-01
Recurso:	SCIELO

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Continuous groups of transformations and time-dependent invariants
Gelover-Santiago,A.L. - Corona-Galindo,M.G.

Formato:	journal article
Enlaces:	In this paper we present a very simple derivation of the constants of motion for dynamical systems, which requires only an elementary knowledge of the theory of continuous groups. In addition, through the infinitesimal Lorenz transformations group, we obtain a…
Fecha:	2007-06-01
Recurso:	SCIELO

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Smokers' reactions to cigarette package warnings with graphic imagery and with only text: a comparison between Mexico and Canada
Thrasher,James F - Hammond,David - Fong,Geoffrey T - Arillo-Santillán,Edna

Formato:	journal article
Enlaces:	OBJECTIVE: This comparison of population-based representative samples of adult smokers in Canada (n=1 751) and Mexico (n=1 081) aimed to determine whether cigarette packages with graphic warning labels in Canada had a stronger impact than the text-only warning labels in…
Fecha:	2007-01-01
Recurso:	SCIELO

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On the potential of an infinite dielectric cylinder and a line of charge: Green's function in an elliptic coordinate approach
Marín,J.L. - Marín-Enriquez,I. - Riera,R. - Pérez-Enriquez,R.

Formato:	journal article
Enlaces:	A two-dimensional Laplace equation is separable in elliptic coordinates and leads to a Chebyshev-like differential equation for both angular and radial variables. In the case of the angular variable η (-1 < η < 1), the solutions are the well…
Fecha:	2007-06-01
Recurso:	SCIELO

Recurso libre

What do we know about adult mortality and data quality in Peru? Mortality coverage levels and trends from recent decades
Piscoya-Díaz,Mario - Queiroz,Bernardo L.

Formato:	journal article
Enlaces:	Accurate knowledge of adult mortality levels and trends in the developing world is hampered by its widespread lack of complete vital registration systems. Although knowledge of infant and child mortality was once affect by the same problem, survey-based techniques have…
Fecha:	2010-03-01
Recurso:	SCIELO

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Low-complexity chaotic encryption system
Hasimoto-Beltrán,R

Formato:	journal article
Enlaces:	Secure multimedia communication presents new challenges that are difficult to handle using by currently adopted encryption schemes (RSA-Rivest-Shamir-Adelman, AES-Advanced Encryption Standard, and IDEA-International Data Encryption algorithm) (28). It requires the processing of huge amounts of information at speeds ranging from…
Fecha:	2007-02-01
Recurso:	SCIELO

Recurso libre

Photometry of polar-ring galaxies
Godínez-Martínez,Arturo - Watson,Alan M. - Matthews,Lynn D. - Sparke,Linda S.

Formato:	journal article
Enlaces:	We have obtained photometry in B and R for seven confirmed or probable polar-ring galaxies from the Polar-Ring Catalog of Whitmore et al. (1990). The rings show a range of colors from B -R ≈ 0.6 to B - R…
Fecha:	2007-10-01
Recurso:	SCIELO

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Cognitive Maps: an Overview and their Application for Student Modeling
Peña,Alejandro - Sossa,Humberto - Gutiérrez,Agustin

Formato:	journal article
Enlaces:	In this paper we state how Cognitive Maps can be used to model causal phenomena. In addition, we show the application of the Cognitive Maps to the field of the Student Modeling. Conceptually speaking, Cognitive Maps set and simulate the…
Fecha:	2007-03-01
Recurso:	SCIELO

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10.

Cleaner production and innovation theory; social experiments as a new model to engage in cleaner production
DIELEMAN,Hans

Formato:	journal article
Enlaces:	This paper discusses the concept of cleaner production and proposes a new model to stimulate cleaner production, in the first section the historical development of cleaner production is sketched. It is indicated that the approach gained much attention in the…
Fecha:	2007-06-01
Recurso:	SCIELO

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11.

Collective Actions in the Face of Violence. Disquisitions based on a Case Study: Comuna 13 in Medellín (Colombia)
Alzate Zuluaga,Mary Luz

Formato:	journal article
Enlaces:	This article contributes to the knowledge and visualization of the types and strategies of action that collective subjects produce to cope with violence in a context of internal armed conflict such as the kind that Colombia has experienced for over…
Fecha:	2010-12-01
Recurso:	SCIELO

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12.

Contributions of the Instituto Nacional de Cardiología in the diagnosis and treatment of the Wolff-Parkinson-White syndrome
Iturralde-Torres,Pedro - Márquez,Manlio F.

Formato:	journal article
Enlaces:	Since the first description of the disease now known as Wolff-Parkinson-White syndrome, much knowledge has been gained through several experimental and clinical studies all over the world. The Instituto Nacional de Cardiología Ignacio Chávez in Mexco City has not been…
Fecha:	2010-12-01
Recurso:	SCIELO

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13.

Eating Disorders
Garner,David M. - Keiper,Christopher D.

Formato:	journal article
Enlaces:	Therapist competency is fundamental to the success in treating most psychological disorders. However, the skills required to effectively treat eating disorders may be more demanding than many other problems, because competency requires mastery of considerable educational information about physical complications…
Fecha:	2010-06-01
Recurso:	SCIELO

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14.

Individual risk factors for Plasmodium vivax infection in the residual malaria transmission focus of Oaxaca, Mexico
Danis-Lozano,Rogelio - Rodríguez,Mario Henry - Betanzos-Reyes,Ángel F - Hernández-Avila,Juan Eugenio - González-Cerón,Lilia - Méndez-Galván,Jorge F - Velázquez-Monroy,Oscar J - Tapia-Conyer,Roberto

Formato:	journal article
Enlaces:	OBJECTIVE: To identify individual risk factors for malaria infection of inhabitants in the residual transmission focus on the Pacific coast of Oaxaca, Mexico. MATERIALS AND METHODS: A population-based, matched case-control study was conducted from January 2002 to July 2003 comparing…
Fecha:	2007-06-01
Recurso:	SCIELO

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15.

Soil genesis in a marine terrace sequence of Sicily, Italy
Wagner,Stephen - Costantini,Edoardo A.C. - Sauer,Daniela - Stahr,Karl

Formato:	journal article
Enlaces:	Knowledge about the rates of pedogenic processes is essential to understand landscape development and history. It can be attained by the quantitative investigation of soil chronosequences. In this work, the development of Chromic Luvisols in the Mediterranean is addressed. The…
Fecha:	2007-08-01
Recurso:	SCIELO

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16.

Smoke-free São Paulo: a campaign evaluation and the case for sustained mass media investment
Alday,Jorge - Murukutla,Nandita - Cedillo,Claudia - Johns,Paula - Monteiro,Anna - Wakefield,Melanie

Formato:	journal article
Enlaces:	Although evidence from high-income countries suggests that mass media campaigns can increase knowledge of tobacco harms and encourage smoking cessation, there is little evidence of this from developing countries, particularly related to campaigns that seek to increase support for smoke-free…
Fecha:	2010-01-01
Recurso:	SCIELO

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17.

On some Panamerican Cretaceous crabs (Decapoda: Raninoida)
Vega,Francisco J. - Nyborg,Torrey - Kovalchuk,Greg - Etayo,Fernando - Luque,Javier - Rojas-Briceño,Alexis - Patarroyo,Pedro - Porras-Múzquiz,Héctor - Armstrong,Adam - Bermúdez,Hermann - Garibay,Luis

Formato:	journal article
Enlaces:	Decapod crustacean specimens recently collected from new and previously reported localities of USA, Mexico, and Colombia, as well as a review of species of uncertain affinity, add important information to complete the descriptions and paleobiological knowledge of some Cretaceous primitive…
Fecha:	2010-08-01
Recurso:	SCIELO

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18.

Design and Implementation of an Advanced Security Remote Assessment System for Universities Using Data Mining
Hernández Aguilar,José Alberto - Burlak,Gennadiy - Lara,Bruno

Formato:	journal article
Enlaces:	We develop the detailed application of the computer technology on testing the student's level of knowledge. We implemented a Java original code, client-server technology based on the natural process of evaluation where the college students (clients) are tested for an…
Fecha:	2010-06-01
Recurso:	SCIELO

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19.

Anion Exchange Behaviour of Zr, Hf, Nb, Ta and Pa as Homologues of Rf and Db in Fluoride Medium
Monroy-Guzman,Fabiola - Trubert,Didier - Brillard,Lucette - Hussonnois,Michel - Constantinescu,Olimpus - Le Naour,Claire

Formato:	journal article
Enlaces:	Studies of the chemical property of transactinide elements are very difficult due to their short half-lives and extremely small production yields. However it is still possible to obtain considerable information about their chemical properties, such as the most stable oxidation…
Fecha:	2010-03-01
Recurso:	SCIELO

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20.

Predicting the distribution of a parasite using the ecological niche model, GARP
Haverkost,Terry R. - Gardner,Scott L. - Townsend Peterson,A.

Formato:	journal article
Enlaces:	The ecological niche of a parasite exists only at the nexus of certain abiotic and biotic conditions suitable for both the definitive and intermediate hosts. However, the life cycles of most parasites are not known, or are poorly known, and…
Fecha:	2010-12-01
Recurso:	SCIELO

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21.

Imaging subsurface lithological and structural features by resistivity tomography: North Beagle Channel (Tierra del Fuego, Argentina)
Tassone,Alejandro - Santomauro,Melina - Menichetti,Marco - Cerredo,María Elena - Remesal,Marcela Beatriz - Lippai,Horacio - Lodolo,Emanuele - Vilas,Juan Francisco

Formato:	journal article
Enlaces:	Worldwide, the study of fold and thrust belts and characterization ofstructures are mainly carried out through superficial geological observations and seismic reflection, as the main geophysical prospecting method. In this study we show how the resistivity method is a useful…
Fecha:	2010-12-01
Recurso:	SCIELO

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22.

Evaluation of information provided to patients' relatives in an ambulatory pediatrics unit of a tertiary-care hospital
Cabrales-Martínez,Rosa-Georgina - Bustos-Córdova,Edgar - Naranjo-López,Yolanda - Adell-Gras,Amapola - Sánchez-Medina,Jerónimo

Formato:	journal article
Enlaces:	Background: There is a high degree of misinformation given to the relatives of patients treated in the Ambulatory Pediatrics Unit at the Hospital Infantil de México Federico Gómez. The factors that contribute to this problem are diverse. Therefore, the practice…
Fecha:	2010-04-01
Recurso:	SCIELO

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23.

Spectroscopic Determination of Optimal Hydration Time of Zircon Surface
Ordóñez-Regil,Eduardo - García-Rosales,Genoveva - García-González,Nidia

Formato:	journal article
Enlaces:	When a mineral surface is immersed in an aqueous solution, it develops an electric charge produced by the amphoteric dissociation of hydroxyl groups created by the hydration of the solid surface. This is one influential surface property. The complete hydration…
Fecha:	2010-09-01
Recurso:	SCIELO

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24.

Distribution, genetic structure, and conservation status of the rare microendemic species, Guaiacum unijugum (Zygophyllaceae) in the Cape Region of Baja California, Mexico
McCauley,Ross A. - Cortés-Palomec,Aurea C. - Oyama,Ken

Formato:	journal article
Enlaces:	Guaiacum unijugum is a rare shrub endemic to a 70 km stretch of coastline extending east from San José del Cabo in Baja California and is the least well-known of the 4 species of Guaiacum in Mexico. To increase our…
Fecha:	2010-12-01
Recurso:	SCIELO

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25.

On the teaching and learning of physics problem solving
Rojas,S.

Formato:	journal article
Enlaces:	This article presents a six-step problem-solving strategy, aimed at addressing three major problems in the learning and teaching of physics: 1) the demand by physics instructors for effective teaching strategies that could help in the teaching of intuitive conceptual and…
Fecha:	2010-06-01
Recurso:	SCIELO

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26.

Intraslab Mexican earthquakes of 27 April 2009 (Mw5.8) and 22 May 2009 (Mw5.6): a source and ground motion study

Formato:	journal article
Enlaces:	Two types of intraslab earthquakes in the subducted Cocos plate occur below Guerrero, Mexico, and adjacent areas: (A) steeply-dipping thrust earthquakes, and (B) normal-faulting earthquakes. Type A events are located ~10-35 km from the coast at a depth of ~35…
Fecha:	2010-09-01
Recurso:	SCIELO

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27.

Body dissatisfaction and perceived sociocultural pressures: gender and age differences
Esnaola,Igor - Rodríguez,Arantzazu - Goñi,Alfredo

Formato:	journal article
Enlaces:	One important area of research that has emerged in recent years is the assessment of factors that contribute to the development of body image problems and, more concretely, to the development of body dissatisfaction. The female sociocultural beauty ideal, a…
Fecha:	2010-02-01
Recurso:	SCIELO