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Aproximadamente 1447 registro(s) hasta el momento: (journal)

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Foreword

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-03-01
Recurso:	SCIELO

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Special Issue on Applied Cryptography & Data Security

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-03-01
Recurso:	SCIELO

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Isocordoin Derivatives From the Root Extract of Lonchocarpus xuul
Yam-Puc,Alejandro - Peña-Rodríguez,Luis M.

Formato:	journal article
Enlaces:	Two natural isocordoin derivatives, dihydroisocordoin (1) and flemistrictin B (2), were isolated from the root extract of Lonchocarpus xuul. Both metabolites were identified on the basis of their spectroscopic data and by comparing them with those reported in the literature.
Fecha:	2009-03-01
Recurso:	SCIELO

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Memorandum on a new financial architecture and new regulations
Ghilarducci,Teresa - Nell,Edward - Mittnik,Stefan - Platen,Eckhard - Semmler,Willi - Chappe,Raphaele

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-03-01
Recurso:	SCIELO

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Electrodeposition of Nickel Particles and their Characterization
Martínez,Gerardo T. - Zavala,Genaro - Videa,Marcelo

Formato:	journal article
Enlaces:	Electrodeposition of nickel particles on ITO substrates is achieved by current pulse reduction. A comparison between potential pulse and current pulse experiments presents differences in particle size and particle size distribution. The latter shows smaller particle size dispersion than what…
Fecha:	2009-03-01
Recurso:	SCIELO

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Searching Prime Numbers with Short Binary Signed Representation
Angel Angel,Jose de Jesús - Morales-Luna,Guillermo

Formato:	journal article
Enlaces:	Modular arithmetic with prime moduli has been crucial in present day cryptography. The primes of Mersenne, Solinas, Crandall and the so called IKE-MODP primes have been widely used in efficient implementations. In this paper we study the density of primes…
Fecha:	2009-03-01
Recurso:	SCIELO

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Secure Communication System Using Chaotic Signals
Campos-Cantón,I - Campos-Cantón,E - Murguía-Ibarra,J.S. - Chavira-Rodríguez,M.E.

Formato:	journal article
Enlaces:	We present experimental results of a chaotic communication system that employs direct modulation, with the Chua's chaotic oscillator as a core of the transmitter block. The main result is that its possible to recover the information signal if we modulate…
Fecha:	2009-03-01
Recurso:	SCIELO

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Full Vehicle Instrumentation for Dynamic Analysis
Bortoni-Anzures,Liborio - Cruz-Victoria,Juan C. - Herrera-Rivas,Hiram - González-Sánchez,D. I. - Díaz-Romero,David - Huixtlaca-Cuautecatl,Isac

Formato:	journal article
Enlaces:	This paper presents the arrangement of a minimum set of components to track the vehicular dynamical behavior of a truck or an articulated vehicle, by using interpolated-GPS signals, vehicle CAN network, and MEMS inclinometers and accelerometers attached to a single…
Fecha:	2009-03-01
Recurso:	SCIELO

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Kinetics and Recovery of Xanthate-Copper Compounds by Ion Flotation Techniques
Reyes,Martín - Patiño,Francisco - Tavera,Francisco J. - Escudero,Ramiro - Rivera,Isauro - Pérez,Miguel

Formato:	journal article
Enlaces:	The recovery of copper in aqueous media by ion flotation in a laboratory flotation cell was carried out. Hydrodynamics and gas dispersion parameters were obtained. The results show that the increase of potassium amyl xanthate concentration above the stoichiometric amount…
Fecha:	2009-03-01
Recurso:	SCIELO

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10.

Construction of Rotation Symmetric Boolean Functions with optimal Algebraic Immunity
Sarkar,Sumanta - Maitra,Subhamoy

Formato:	journal article
Enlaces:	In this paper, we present theoretical constructions of Rotation Symmetric Boolean Functions (RSBFs) on odd number of variables with the maximum possible algebraic immunity. To get high nonlinearity, we generalize our construction to a search technique in the RSBF class.…
Fecha:	2009-03-01
Recurso:	SCIELO

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11.

Algebraic Immunity of Boolean Functions - Analysis and Construction
Dalai,Deepak Kumar - Maitra,Subhamoy

Formato:	journal article
Enlaces:	In this paper, we first analyse the method of finding algebraic immunity of a Boolean function. Given a Boolean function f on n-variables, we identify a reduced set of homogeneous linear equations by solving which one can decide whether there…
Fecha:	2009-03-01
Recurso:	SCIELO

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12.

Diagnostic Basic Elements for Quality Practices Implementation
Sánchez-Lara,B - Sánchez-Guerrero,G

Formato:	journal article
Enlaces:	This paper identifies the most relevant diagnostic elements that Mexican consultants use in order to know the current performance of micro, small and medium size enter prises (MSME) prior to a quality practice implementation and to estimate the probability of…
Fecha:	2009-03-01
Recurso:	SCIELO

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13.

Tungsten Carbide and Tantalum Carbide Coatings on Machining Tools
Palomar,F.E. - Zambrano,P - Gómez,M. I. - Colás,R - Castillo,A

Formato:	journal article
Enlaces:	High speed steel tools for machining were coated with WC and TaC by chemical vapor deposition (CVD), and were used in a high speed milling machine. The physical integrity of the tools coatings were analyzed by scanning electron microscopy at…
Fecha:	2009-03-01
Recurso:	SCIELO

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14.

Molecular Modeling Study of 2-Substituted Isoindoline Derivatives of α-Amino Acids as Inhibitors of Lipoxygenase by Docking Simulations
Mancilla Percino,Teresa - Correa Basurto,José - Alavés Carbajal,Karla S. - Valle-Sandoval,Nagchielli - Trujillo Ferrara,José

Formato:	journal article
Enlaces:	In this work two series of isoindolines 1(a-g) and 2(a-g) were evaluated as possible inhibitors of lipoxygenase (LOX) by docking studies, as well as for the antiinflammatories isoindolilamides 3-5 and ibuprofen 6, as part of a theoretical study to found…
Fecha:	2009-03-01
Recurso:	SCIELO

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15.

A Search for Structural Alternatives of RNA
Krishnamurthy,Ramanarayanan

Formato:	journal article
Enlaces:	This account describes a search for potentially primordial informational oligomers; the work is the direct outcome of the research program that was initiated by the Eschenmoser group -at ETH Zürich about 20 years ago and was continued at The Scripps…
Fecha:	2009-03-01
Recurso:	SCIELO

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16.

Titrimetric and Spectrophotometric Assay of Pantoprazole in Pharmaceuticals Using Permanganate
Basavaiah,Kanakapura - Rajendraprasad,Nagaraju - Tharpa,Kalsang - Anilkumar,Urdigere Rangachar - Hiriyanna,Salamara Ganeshbhat - Vinay,Kanakapura Basavaiah

Formato:	journal article
Enlaces:	Abstract Titrimetric and spectrophotometric assay of pantoprazole sodium (PPS) using permanganate as the oxidimetric reagent is described. In titrimetry, PPS is treated with a measured excess of permanganate in H2SO4 medium followed by the determination of unreacted oxidant by back…
Fecha:	2009-03-01
Recurso:	SCIELO

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17.

The 1982 eruption of El Chichón volcano, Mexico: Eyewitness of the disaster
De la Cruz-Reyna,S - Martin Del Pozzo,A. L.

Formato:	journal article
Enlaces:	El Chichón volcano erupted explosively on March 28, 1982, after a long quiescence, producing a heavy wet ash fall locally and extensive ash fall over 200 km away that resulted in closing of airports and roads. Intermittent small eruptions continued…
Fecha:	2009-03-01
Recurso:	SCIELO

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18.

CO2 flux from the volcanic lake of El Chichón (Mexico)
Mazot,A - Taran,Y

Formato:	journal article
Enlaces:	Carbon dioxide flux was measured in March 2007 at the surface of the volcanic lake of El Chichón volcano, Mexico using the floating accumulation chamber method. The results of 162 measurements and the application of a standard statistical approach developed…
Fecha:	2009-03-01
Recurso:	SCIELO

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19.

Non-methane Volatile Organic Compounds (VOCs) at El Chichón volcano (Chiapas, México): Geochemical features, origin and behavior
Tassi,F. - Capaccioni,B. - Capecchiacci,F. - Vaselli,O.

Formato:	journal article
Enlaces:	Geochemical features of the organic gas fraction in fumarolic fluids at El Chichón volcano (Chiapas State, Mexico) are studied to investigate the origin of non-methane volatile organic compounds (VOCs) and the processes governing their behavior. VOCs from fumaroles and bubbling…
Fecha:	2009-03-01
Recurso:	SCIELO

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20.

Tephrochronological evidence for the late Holocene eruption history of El Chichón volcano, Mexico
Nooren,C. A. M. - Hoek,W.Z. - Tebbens,L. A. - Martin Del Pozzo,A. L.

Formato:	journal article
Enlaces:	Pre-Columbian societies in the Maya Lowlands were repeatedly exposed to tephra-fall from past eruptions of El Chichón volcano, Chiapas, Mexico. Late Holocene tephra layers are well preserved in sediments of the Usumacinta-Grijalva river delta, about 150 km NNE of the…
Fecha:	2009-03-01
Recurso:	SCIELO

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21.

Volcanic hazards and risk perception at the "Zoque" community of Chapultenango: El Chichón volcano, Chiapas, México
Limón-Hernández,C - Macías,J. L.

Formato:	journal article
Enlaces:	After 22 years of the 1982 eruption of El Chichón volcano, we conducted a statistically based survey of the residents of the community of Chapultenango (10 km east of the volcano) to assess their perception of volcano hazards and risk.…
Fecha:	2009-03-01
Recurso:	SCIELO

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22.

A general model for tectonic control of magmatism: Examples from Long Valley Caldera (USA) and El Chichón (México)
Bursik,M

Formato:	journal article
Enlaces:	The relationship of volcanoes to regional tectonic setting and earthquake dynamics is intimate. We know that eruptions are often triggered by earthquakes, and that volcanoes generally lie along or near major faults or within faulted provinces. It has been generally…
Fecha:	2009-03-01
Recurso:	SCIELO

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23.

The concept of exploitation in a general linear model with heterogeneous labour
Fujimoto,Takao

Formato:	journal article
Enlaces:	In this paper we consider the concept of exploitation and the so-called Fundamental Marxian Theorem in a general linear model in which proper joint production, heterogeneous labour, and durable consumption goods are all allowed for. One of the features of…
Fecha:	2009-03-01
Recurso:	SCIELO

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24.

A calibrated agricultural water demand model for three regions in northern Baja California
Medellín-Azuara,Josué - Howitt,Richard E. - Waller-Barrera,Cynthia - Mendoza-Espinosa,Leopoldo G. - Lund,Jay R. - Taylor,Joseph E.

Formato:	journal article
Enlaces:	Irrigated agriculture is the largest water user in many regions, and agricultural water use efficiency and consumption has been studied by several authors. This paper provides a framework and application of economic valuation of water for agriculture in three regions…
Fecha:	2009-03-01
Recurso:	SCIELO

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25.

Pedogenesis and characteristics of the terra rossas developed on different physiographic position and their classification
Aydinalp,Cumhur - FitzPatrick,Ewart Adsil

Formato:	journal article
Enlaces:	Terra Rossas occur in the eastern part of the Bursa plain, Turkey. The region is covered by large forests growing on Terra Rossa soils. This area has ecological importance for these forests. The purpose of this study was to characterize…
Fecha:	2009-03-01
Recurso:	SCIELO

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26.

Nontrivial Solutions to the Cubic Sieve Congruence Problem: x³ y²z mod p
Maitra,Subhamoy - Subba Rao,Y. V. - Stanica,Pantelimon - Gangopadhyay,Sugata

Formato:	journal article
Enlaces:	In this paper we discuss the problem of finding nontrivial solutions to the Cubic Sieve Congruence problem, that is, solutions of x³ = y²z (mod p), where x,y,z < and x³ ≠ y²z. The solutions to this problem…
Fecha:	2009-03-01
Recurso:	SCIELO

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27.

Hardware Architecture and Cost/time/data Trade-off for Generic Inversion of One-Way Function
Mukhopadhyay,Sourav - Sarkar,Palash

Formato:	journal article
Enlaces:	In many cases, a cryptographic algorithm can be viewed as a one-way function, which is easy to compute in forward direction but hard to invert. Inverting such one-way function amounts to breaking the algorithm. Time-Memory Trade-Off (TMTO) is a twenty…
Fecha:	2009-03-01
Recurso:	SCIELO

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28.

Ontological representation based on semantic descriptors applied to geographic objects
Torres-Ruiz,Miguel Jesús - Levachkine,Serguei

Formato:	journal article
Enlaces:	In this dissertation the GEONTO-MET methodology is presented. It is oriented to formalize the geographic domain conceptualization according to the specifications of the Instituto Nacional de Estadística, Geografía e Informática (INEGI). The main goal is to provide semantic descriptions, which…
Fecha:	2009-03-01
Recurso:	SCIELO

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29.

Fusing Interesting Topics in the Web
Cuevas-Rasgado,A.D. - Guzman-Arenas,A

Formato:	journal article
Enlaces:	A person builds his or her knowledge from different sources of information. In school he learns that Buonarroti was born in Caprese and at home they tell him that the name of the neighbor's dog is Fido. In order to…
Fecha:	2009-03-01
Recurso:	SCIELO

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30.

On empirical research in the field of using history in mathematics education
Jankvist,Uffe Thomas

Formato:	journal article
Enlaces:	This paper addresses the question of empirical research in the field of using history in Mathematics Education. More precisely, it focuses on what role empirical research may serve in the discussion of why to use history in mathematics education and…
Fecha:	2009-03-01
Recurso:	SCIELO

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31.

Virtual Assembly Rapid Prototyping of Near Net Shapes
Lim,Theodore - Medellin,Hugo - Sung,Raymond - Ritchie,James - Corney,Jonathan

Formato:	journal article
Enlaces:	Virtual reality (VR) provides another dimension to many engineering applications. Its immersive and interactive nature allows an intuitive approach to study both cognitive activities and performance evaluation. Market competitiveness means having products meet form, fit and function quickly. Rapid Prototyping…
Fecha:	2009-03-01
Recurso:	SCIELO

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32.

El Chichón's "surprise" eruption in 1982: Lessons for reducing volcano risk
Tilling,R. I.

Formato:	journal article
Enlaces:	During one week (28 March-4 April 1982), three powerful explosive eruptions (VEI 5) of El Chichón Volcano caused the worst volcanic disaster in Mexico's recorded history. Pyroclastic flows and surges obliterated nine villages, killing about 2,000 people, and ashfalls downwind…
Fecha:	2009-03-01
Recurso:	SCIELO

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33.

El Chichón volcanic complex, Chiapas, México: Stages of evolution based on field mapping and 40Ar/39Ar geochronology
Layer,P. W. - García-Palomo,A - Jones,D - Macías,J. L. - Arce,J. L. - Mora,J. C.

Formato:	journal article
Enlaces:	A new interpretation of the evolution of El Chichón volcano is presented in this paper based on photogeology, fieldwork, 40Ar/39Ar dating and chemistry of juvenile products. El Chichón volcano belongs to a volcanic complex formed by craters and peripheral domes…
Fecha:	2009-03-01
Recurso:	SCIELO

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34.

Major and trace element geochemistry of El Chichón volcano-hydrothermal system (Chiapas, México) in 2006-2007: implications for future geochemical monitoring
Rouwet,D. - Bellomo,S. - Brusca,L. - Inguaggiato,S. - Jutzeler,M. - Mora,R. - Mazot,A. - Bernard,R. - Cassidy,M. - Taran,Y.

Formato:	journal article
Enlaces:	Isotopic, major and trace element composition studies for the crater lake, the Soap Pool and thermal springs at El Chichón volcano in November 2006-October 2007 confirm the complex relationship between annual rainfall distribution and crater lake volume and chemistry. In…
Fecha:	2009-03-01
Recurso:	SCIELO

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35.

Risk perception and coping strategies for risk from Popocatépetl volcano, Mexico
López-Vázquez,E

Formato:	journal article
Enlaces:	The goal of this study is to explore risk perception and coping strategies used by adults living near the volcano Popocatépetl in Mexico. Qualitative and semi-quantitative data were collected with a questionnaire from 192 adult respondents. These respondents were divided…
Fecha:	2009-03-01
Recurso:	SCIELO

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36.

Geochemistry and tectonic controls of the effusive activity related with the ancestral Nevado del Ruiz volcano, Colombia
Borrero,C - Toro,L. M. - Alvarán,M - Castillo,H

Formato:	journal article
Enlaces:	In this paper, we discuss the geochemical aspects and the tectonic setting of the effusive activity between 2.0 to 1.0 Ma (the Ancestral Ruiz stage) of Nevado del Ruiz Volcano (NRV: 4° 50-55'N, 75° 14-20' W, 5,390 masl), this volcano…
Fecha:	2009-03-01
Recurso:	SCIELO

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37.

Ascorbic acid, phenolic content, and antioxidant capacity of red, cherry, yellow and white types of pitaya cactus fruit (Stenocereus stellatus Riccobono)
Beltrán-Orozco,M. Carmen - Oliva-Coba,Tzatzil G. - Gallardo-Velázquez,Tzayhri - Osorio-Revilla,Guillermo

Formato:	journal article
Enlaces:	In order to sustain the growing interest in the consumption of pitaya cactus (Stenocereus stellatus Riccobono) fruit as potential neutraceutical food, the total phenolics and ascorbic acid contents were determined in four pitaya cactus fruit types (red, cherry, yellow and…
Fecha:	2009-03-01
Recurso:	SCIELO

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38.

A Generic Method to Extend Message Space of a Strong Pseudorandom Permutation
Nandi,Mridul

Formato:	journal article
Enlaces:	Let E be a strong pseudorandom permutation (or SPRP) secure enciphering scheme (i.e., a length-preserving encryption scheme) which can only encrypt messages of size multiple of n, the block size of the underlying block cipher. There are several such constructions,…
Fecha:	2009-03-01
Recurso:	SCIELO

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39.

Ten-year clinical and echocardiographic follow-up of patients undergoing percutaneous mitral commissurotomy with Inoue balloon
López-Meneses,Mauricio - Martínez Ríos,Marco Antonio - Vargas Barrón,Jesús - Reyes Corona,Jesús - Sánchez,Francisco

Formato:	journal article
Enlaces:	Percutaneous mitral commissurotomy (PMC) has emerged as an effective nonsurgical technique for the treatment of patients with symptomatic mitral stenosis. This report highlights the immediate and long-term follow-up results of this procedure in an unselected cohort of patients with rheumatic…
Fecha:	2009-03-01
Recurso:	SCIELO

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40.

Special Issue of the J. Mex. Chem. Soc. in Honor of Dr. Lars Hellberg (1930-2011)

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2011-03-01
Recurso:	SCIELO

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41.

Editorial
Sossa Azuela,Juan Humberto

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2011-03-01
Recurso:	SCIELO

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42.

The final volume in an epic series on reptilian biology
Flores Villela,Oscar

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2011-03-01
Recurso:	SCIELO

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43.

Syntheses of Three Mono-Brominated Enamide Analogs of Natural Alkaloids Isolated from the Tasmanian Marine Bryozoan Amathia Wilson
Ramírez-Osuna,Moisés - Narvaez-Garayzar,Oscar F. - Somanathan,Ratnasamy - Aguirre,Gerardo

Formato:	journal article
Enlaces:	Synthesis of three brominated enamides, analogs of natural alkaloids isolated from the Tasmanian marine bryozoan Amathia Wilson, were prepared by a sequence of reactions starting from 3-hydroxybenzaldehyde.
Fecha:	2011-03-01
Recurso:	SCIELO

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44.

Constituents of Organic Extracts of Cuphea hyssopifolia
Morales-Serna,José Antonio - García-Ríos,Eréndira - Madrigal,Domingo - Cárdenas,Jorge - Salmón,Manuel

Formato:	journal article
Enlaces:	From the aerial part of Cuphea hyssopifolia (Lythraceae) diterpenes and flavonoids were isolated. The compounds were identified as: friedelan-3β-ol 1, ursolic acid 2, methyl gállate 3, quercetin 4, quercetin-3-O-α-rhamnopyranoside 5, 1,2,3,4,6-penta-O-galloyl-β-D-glucose 6 and manitol 7.
Fecha:	2011-03-01
Recurso:	SCIELO

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45.

Side-Wall Functionalization of Multi-Walled Carbon Nanotubes with t-Butyl Diazoacetate
Rogel-Hernández,Eduardo - Alonso-Nuñez,Gabriel - Camarena,Juan P. - Espinoza-Gómez,Heriberto - Aguirre,Gerardo - Paraguay-Delgado,Francisco - Somanathan,Ratnasamy

Formato:	journal article
Enlaces:	The covalent functionalization of multiwall carbon nanotubes (MWCNT) and its characterization techniques are reported. MWCNT were functionalized with tert-butyldiazoacetate to give methano-bridged ester group. Functionalized carbon nanotube by ester and its hydrolyzed carboxylic acid were characterized by high resolution electron…
Fecha:	2011-03-01
Recurso:	SCIELO

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46.

Computational Modeling of the Dehydrogenation of Methylamine
Ivey,Kirsten - Sanders,Belynda - Estela,Chris - Cooksy,Andrew L.

Formato:	journal article
Enlaces:	The reaction sequence early in the metabolism of methyl-amine by the dehydrogenase cofactor tryptophan tryptophyl quinone (TTQ) is investigated by a large series of density functional theory calculations. Free energy corrections are calculated at the reactant and intermediate geometries, and…
Fecha:	2011-03-01
Recurso:	SCIELO

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47.

N-N Torsion Angle in BINAM-Mono and Bis(Sulfonamide) Ligands and its Effect on the Catalytic Asymmetric Transfer Hydrogenation (ATH) of Aromatic Ketones
Barrón-Jaime,Angélica - Aguirre,Gerardo - Parra-Hake,Miguel - Chávez,Daniel - Madrigal,Domingo - Sanders,Belynda - Cooksy,Andrew L. - Somanathan,Ratnasamy

Formato:	journal article
Enlaces:	Ligands L1 and L2 were synthesized from commercially available (R)-(+)-1,1'-binaphthyl-2,2'-diamine and tested with RhIII Cp* as catalysts in the asymmetric transfer hydrogenation of aromatic ketones in aqueous sodium formate. The results were compared with ligands derived from 1,2-, 1,4-, and…
Fecha:	2011-03-01
Recurso:	SCIELO

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48.

Polystyrene Composites Prepared with Polystyrene Grafted-fibers of Sugarcane Bagasse as Reinforcing Material
Zizumbo,Arturo - Licea-Claveríe,Angel - Lugo-Medina,Eder - García-Hernández,Edgar - Madrigal,Domingo - Zitzumbo,Roberto

Formato:	journal article
Enlaces:	Bagasse Fibers of sugarcane were modified with dichlo-romethylvinylsilane and consecutively grafted with polystyrene. For unmodified fibers, TGA showed two maximum decomposition peaks at 320°C and at 370°C. For silanized fibers, the most stable stage was shifted to a higher temperature…
Fecha:	2011-03-01
Recurso:	SCIELO

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49.

Air Dehydration by Permeation Through Dimethylpolysiloxane/polysulfone Membrane
Wai Lin,Shui - Valera Lamas,Salvador

Formato:	journal article
Enlaces:	The present work focuses on design, fabrication and evaluation of an air-dehydration membrane system that is capable of producing dry air with a Dew Point of -50°C at a rate of 310 cm³/s using compressed wet-air (90 psig, 23°C) as…
Fecha:	2011-03-01
Recurso:	SCIELO

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50.

Phragmipedium warscewiczii, a new record for the Mexican orchid flora
Solano-Gómez,Rodolfo - Martínez-Ovando,Eduardo

Formato:	journal article
Enlaces:	Phragmipedium warscewiczii is reported as new record for the Mexican orchid flora from material recently collected in Chiapas. The species is described from Mexican specimens and it is compared with P. exstaminodium, its closest ally. The Mexican locality is the…
Fecha:	2011-03-01
Recurso:	SCIELO

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51.

Where has Aristolochia tricaudata (ARISTOLOCHIACEAE) gone? New record of a critically endangered species in Oaxaca, Mexico
Rivera-Hernández,Jaime Ernesto - Samain,Marie-Stéphanie

Formato:	journal article
Enlaces:	During fieldwork in San Juan Teponaxtla, Oaxaca, 3 individuals of Aristolochia tricaudata Lemaire, a very rare species threatened with extinction, were observed with flowers and fruits. Although this species is present in many botanical gardens, fruits have never been observed.…
Fecha:	2011-03-01
Recurso:	SCIELO

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52.

Buffer Effects on Drug Release Kinetics From Acidic Hydrophobic Gel Discs
Serrano-Medina,Aracely - Cornejo-Bravo,José Manuel

Formato:	journal article
Enlaces:	Here we study the variability of drug release rates from hydrophobic polyacid gels, due to the presence of basic buffer species. Release kinetics of the model drug salicylic acid from crosslinked poly(methyl methacrylate-co-methacrylic acid) hydrogels were measured as a function…
Fecha:	2011-03-01
Recurso:	SCIELO

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53.

Controlled Synthesis of Block Copolymers containing N-isopropylacrylamide by Reversible Addition-Fragmentation Chain-Transfer (RAFT) Polymerization
Vega-Rios,Alejandro - Licea-Claveríe,Angel

Formato:	journal article
Enlaces:	Synthesis of diblock copolymers of N-isopropylacrylamide with n-hexyl acrylate, styrene, methyl methacrylate and 2-hydroxyethyl methacrylate, were carried out by using a sequential "living" polymerization method in the presence of chain transfer agent (CTA) 4-Cyano-4-(phenylcarbonothioylthio)pentanoic acid. The block copo-lymer composition and…
Fecha:	2011-03-01
Recurso:	SCIELO

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54.

Cyanide Degradation by Direct and Indirect Electrochemical Oxidation in Electro-active Support Electrolyte Aqueous Solutions
Felix-Navarro,Rosa María - Wai Lin,Shui - Violante-Delgadillo,Virginia - Zizumbo-Lopez,Arturo - Perez-Sicairos,Sergio

Formato:	journal article
Enlaces:	The cyanide degradation was performed in an electrochemical reactor (with anode of reticulated vitreous carbon and cathodes of graphite) with three compartments separated by a polymeric membrane. The experiments were made under different conditions; supporting electrolytic media (NaOH, NaCl, NaNO3…
Fecha:	2011-03-01
Recurso:	SCIELO

Recurso libre

55.

The bolide of February 10, 2010: Observations in Hidalgo and Puebla, Mexico
Cordero,Guadalupe - Cervantes-de la Cruz,Karina - Gómez,Eduardo

Formato:	journal article
Enlaces:	On February 10th, 2010, the inhabitant population of some towns near the border between the States of Hidalgo and Puebla, Mexico, heard a strong blast overhead and felt seismic tremors and roof and windows vibration. At Tulancingo, Hidalgo, 25 km…
Fecha:	2011-03-01
Recurso:	SCIELO

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56.

New High-Performance Full Adders Using an Alternative Logic Structure
Linares Aranda,Mónico - Aguirre Hernández,Mariano

Formato:	journal article
Enlaces:	This paper presents two new high-speed low-power 1-bit full-adder cells using an alternative logic structure, and the logic styles DPL and SR-CPL. The adders were designed using electrical parameters of a 0.35µm Complementary Metal-Oxide-Semiconductor (CMOS) process, and were compared with…
Fecha:	2011-03-01
Recurso:	SCIELO

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57.

A Low-Complexity current-mode WTA circuit based on CMOS Quasi-FG Inverters
Molinar Solís,Jesús Ezequiel - Sánchez Gaspariano,Luis Abraham - García Lozano,Rodolfo Zolá - Ponce Ponce,Víctor - Ocampo Hidalgo,Juan J. - Molina Lozano,Herón - Díaz Sánchez,Alejandro

Formato:	journal article
Enlaces:	In this paper, a low-complexity current-mode Winner-Take-All circuit (WTA) of O (n) complexity with logical outputs is presented. The proposed approach employs a Quasi-FG Inverter as the key element for current integration and the computing of the winning cell. The…
Fecha:	2011-03-01
Recurso:	SCIELO

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58.

Intracardiac ultrasound-guided percutaneous mitral valvuloplasty
Peña-Duque,Marco Antonio - Zabal-Cerdeira,Carlos - Amado-de León,José Alejandro - García Montes,José Antonio - Martínez-Ríos,Marco Antonio

Formato:	journal article
Enlaces:	Intracardiac echocardiography (ICE) is a relatively new method of ultrasound images useful during cardiac percutaneous interventional procedures. The first human experience with this method was published in 2000 and, since then, several original trials have enrolled this useful method, proving…
Fecha:	2011-03-01
Recurso:	SCIELO

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59.

Learning mathematics with adult learners: drawing from parents' perspective
Díez-Palomar,Javier - Menéndez,José María - Civil,Marta

Formato:	journal article
Enlaces:	This article explores issues related to the relationship between everyday mathematics and academic mathematics within adult education, through a series of workshops with parents. Participants were encouraged to reflect on their perspective on learning and teaching mathematics through different activities…
Fecha:	2011-03-01
Recurso:	SCIELO

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60.

The blue land planarian Caenoplana coerulea, an invader in Argentina
Luis-Negrete,Lisandro Héctor - Brusa,Francisco - Winsor,Leigh

Formato:	journal article
Enlaces:	The blue land planarian Caenoplana coerulea is reported from Argentina (Buenos Aires province). We found C. coerulea in the east central region of Argentina in anthropic environments. The specimens that we found have the characteristic of the species found in…
Fecha:	2011-03-01
Recurso:	SCIELO

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61.

The ringtail tonguefish, Symphurus ocellaris, a new addition to the marine fish fauna of Mexico (Cynoglossidae, Pleuronectiformes)
van der Heiden,Albert M. - Ruiz-Guerrero,Marcela - Plascencia-González,Héctor G.

Formato:	journal article
Enlaces:	Eleven specimens of the ringtail tonguefish, Symphurus ocellaris Munroe and Robertson, 2005, were obtained from off the coasts of Chiapas and Colima, Mexico. Previously, this species was known only from the 2 type specimens collected off the Pacific coast of…
Fecha:	2011-03-01
Recurso:	SCIELO

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62.

Consumption of an adult Puma yagouaroundi (Felidae) by the snake Boa constrictor (Boidae) in Central Mexico
Monroy-Vilchis,Octavio - Sánchez,Óscar - Urios,Vicente

Formato:	journal article
Enlaces:	Few felids have been recorded as being preyed upon by the Boa constrictor snake (Boa constrictor). Documentation of predation on felids by reptiles is scarce, and natural predators of the adult jaguarundi (Puma yagouaroundi) are poorly known. Here, we report…
Fecha:	2011-03-01
Recurso:	SCIELO

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63.

Magnetic parameter analysis of a climosequence of soils in the Southern Pampean Region, Argentina
Bartel,Andrea A. - Bidegain,Juan Carlos - Sinito,Ana María

Formato:	journal article
Enlaces:	Magnetic parameters of different soil types from Caleu-Caleu, La Pampa, Tres Arroyos, Buenos Aires province, Argentina show an increase in ferrimagnetic mineral concentrations in the solum. Titanomagnetites are major magnetic minerals in the soils. The distribution patterns of grain size…
Fecha:	2011-03-01
Recurso:	SCIELO

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64.

Growth and convergence/divergence in productivity under balance-of-payments constraint
Pérez Caldentey,Esteban - Ali,Anesa

Formato:	journal article
Enlaces:	This paper presents a model of convergence/divergence in productivity for two economies of different size and development building on Kaldor's cumulative causation and the technological gap approaches to growth. Both operate within the logic provided by a balance-of-payments constraint framework.…
Fecha:	2011-03-01
Recurso:	SCIELO

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65.

Genetic variation among Pinus patula populations along an altitudinal gradient. Two environment nursery tests
Sáenz-Romero,Cuauhtémoc - Ruiz-Talonia,Lorena F. - Beaulieu,Jean - Sánchez-Vargas,Nahum M. - Rehfeldt,Gerald E.

Formato:	journal article
Enlaces:	Aiming to determine if there is genetic differentiation among Pinus patula Schiede et Chamizo populations along an altitudinal gradient and for quantifying the genotype × environment interaction, 13 Pinus patula populations were sampled from forests of the Native Indian Community…
Fecha:	2011-03-01
Recurso:	SCIELO

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66.

Modeling the observed hydrograph recession of a small semiarid watershed
Núñez-González,Gerardo - Domínguez-Cortázar,Miguel A. - Ventura-Ramos,Eusebio - Ramírez,Aldo I.

Formato:	journal article
Enlaces:	The recession curve of observed hydrographs was modeled based on the concept of linear reservoirs. Each of the recession limbs was fitted using a non-linear curve fitting procedure based on Levenberg-Marquardt algorithm. The results showed that in general the response…
Fecha:	2011-03-01
Recurso:	SCIELO

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67.

Contrast Enhancement Based on a Morphological Rational Multiscale Algorithm
Peregrina Barreto,Hayde - Terol Villalobos,Iván R

Formato:	journal article
Enlaces:	Contrast enhancement is an important task in image processing and it is commonly used as a preprocessing step in order to improve the results for other tasks such as segmentation. However, not only do some methods for contrast improvement have…
Fecha:	2011-03-01
Recurso:	SCIELO

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68.

Fault Detection in a Heat Exchanger, Comparative Analysis between Dynamic Principal Component Analysis and Diagnostic Observers
Tudón Martínez,Juan C. - Morales Menéndez,Rubén - Ramírez Mendoza,Ricardo A. - Garza Castañón,Luis E. - Vargas Martínez,Adriana

Formato:	journal article
Enlaces:	A comparison between the Dynamic Principal Component Analysis (DPCA) method and a set of Diagnostic Observers (DO) under the same experimental data from a shell and tube industrial heat exchanger is presented. The comparative analysis shows the detection properties of…
Fecha:	2011-03-01
Recurso:	SCIELO

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69.

Designing Type-1 Fuzzy Logic Controllers via Fuzzy Lyapunov Synthesis for Nonsmooth Mechanical Systems: The Perturbed Case
Cazarez Castro,Nohe Ramón - Aguilar Bustos,Luis Tupak - Castillo López,Oscar

Formato:	journal article
Enlaces:	Fuzzy Lyapunov Synthesis is extended for the design of type-1 fuzzy logic controllers for an output regulation problem for a servomechanism with backlash. The problem in question is to design a feedback controller so as to obtain the closed-loop system…
Fecha:	2011-03-01
Recurso:	SCIELO

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70.

A Statistical comparative analysis of Simulated Annealing and Variable Neighborhood Search for the Geographic Clustering Problem
Bernábe Loranca,Beatriz - Espinosa Rosales,José E. - Ramírez Rodríguez,Javier - Osorio Lama,María A

Formato:	journal article
Enlaces:	This paper describes a factorial statistical study that compares the quality of solutions produced by two heuristics: Simulated Annealing (SA) and Variable Neighborhood Search (VNS). These methods are used to solve the Geographic Clustering Problem (GCP), and the quality of…
Fecha:	2011-03-01
Recurso:	SCIELO

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71.

Periodicity and Texel Size Estimation of Visual Texture Using Entropy Cues
Lizarraga Morales,Rocío - Sánchez Yáñez,Raúl E. - Ayala Ramírez,Víctor

Formato:	journal article
Enlaces:	Texture periodicity and texture element (texel) size are important characteristics for texture recognition and discrimination. In this paper, an approach to determine both, texture periodicity and texel size, is proposed. Our method is based on the entropy, a texture measure…
Fecha:	2011-03-01
Recurso:	SCIELO

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72.

Security in AODV Protocol Routing for Mobile ad hoc Networks
Villanueva-Cruz,J.A. - García-Hernández,C.F. - Pérez-Díaz,J.A. - Cahue-Díaz,G - González-Serna,J.G.

Formato:	journal article
Enlaces:	Routing protocols in Mobile Ad hoc Networks (mAd hoc or MANET) are exposed to several types of attacks. An attack detection module is proposed in this research work in order to protect the Ad hoc On-Demand Distance Vector (AODV) protocol…
Fecha:	2011-03-01
Recurso:	SCIELO

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73.

Spontaneous rupture of an aneurysm of the sinus of Valsalva into the right atrium, associated with an atrial septal aneurysm
López-Velarde B,Pedro - Avila-Vanzzini,Nydia - López-Velarde Peña,Tatiana - Dabaghi-Richerand,Alejandro - López-Soriano,Fernando - Espinola-Zavaleta,Nilda

Formato:	journal article
Enlaces:	Aneurysms of the sinus of Valsalva (SV) and the atrial septum are a rare association. We report the case of a 28-year-old woman, who was admitted to our department complaining of progressive dyspnea of 10 days of evolution, five hours…
Fecha:	2011-03-01
Recurso:	SCIELO

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74.

Shifting to the red the absorption edge in TiO2 films: a photoacoustic study
Gordillo-Delgado,F. - Villa-Gómez,K. - Marín,E

Formato:	journal article
Enlaces:	When Titanium dioxide in contact with a polluted water sample is irradiated with ultraviolet light, electron-hole pairs can be generated, which can react with oxygen and water producing free radicals that can degrade the pollutants, changing them into harmless compounds…
Fecha:	2011-03-01
Recurso:	SCIELO

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75.

Systematics and evolutionary biology: uneasy bedfellows?
Schwartz,Jeffrey H.

Formato:	journal article
Enlaces:	The history of systematics and evolutionary biology demonstrates how greatly the "modern evolutionary synthesis" instrumentally prevented, rather than facilitated, the intellectual growth and maturity of the diversity of evolutionary disciplines. In truth, the claim of the synthesis being synthetic is…
Fecha:	2011-03-01
Recurso:	SCIELO

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76.

Digenean parasites of Ciconiiform birds from Argentina
Drago,Fabiana B. - Lunaschi,Lía I.

Formato:	journal article
Enlaces:	The helminthological survey of 13 specimens of 5 ciconiiform species revealed the presence of 10 species of intestinal digeneans: Sphincterodiplostomum musculosum Dubois, 1936 in Tigrisoma lineatum and Ardea alba; Tylodelphys elongata (Lutz, 1928) in T. lineatum; Apharyngostrigea ardearum (Lutz, 1928)…
Fecha:	2011-03-01
Recurso:	SCIELO

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77.

The Afro-Asian cyclopoid Mesocyclops aspericornis (Crustacea: Copepoda) in eastern Mexico with comments on the distribution of exotic copepods
Suárez-Morales,Eduardo - Gutiérrez-Aguirre,Martha A. - Mendoza,Fredy

Formato:	journal article
Enlaces:	The Afro-Asian freshwater copepod Mesocyclops aspericornis (Daday, 1906), deemed as an exotic species in the Americas, is known to occur disjunctly in Mexico, South America, and the insular Caribbean. Adult females of this species were recorded.from samples collected in the…
Fecha:	2011-03-01
Recurso:	SCIELO

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78.

Description of the immature stages of Sigara (Tropocorixa) jensenhaarupi (Hemiptera: Heteroptera: Corixidae: Corixini), with ecological notes
Melo,María Cecilia - Scheibler,Erica Elizabeth

Formato:	journal article
Enlaces:	Sigara (Tropocorixa) jensenhaarupi Jaczewski is the smallest species of the subgenus ranging from 4.2-4.7 mm, and it is characterized by the absence of a strigil, the small and narrow genital capsule with a short hypandrium in males, and the shape…
Fecha:	2011-03-01
Recurso:	SCIELO

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79.

Morphology and anatomy of Rhipsalis cereuscula, Rhipsalis floccosa subsp. hohenauensis and Lepismium cruciforme (Cactaceae) seedlings
Secorun,Alan C. - Souza,Luiz Antonio de

Formato:	journal article
Enlaces:	Rhipsalis cereuscula Haw., Rhipsalis floccosa subsp. hohenauensis (F. Ritter) Barthlott et N. P. Taylor and Lepismium cruciforme (Vellozo) Miquel are obligatory epiphytes that occur frequently on tree trunks of remnant forests in Maringa, Paraná state, Brazil. Morphological and anatomical analyses…
Fecha:	2011-03-01
Recurso:	SCIELO

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80.

Tail loss incidence in the Chihuahuan fringe toed-lizard Uma paraphygas (Squamata: Phrynosomatidae)
Castañeda,Gamaliel - García-De la Peña,Cristina - Gadsden,Héctor - Contreras-Balderas,Armando J. - Cooper,William E.

Formato:	journal article
Enlaces:	We analyzed lizard population density and tail loss frequency in 2 populations of Uma paraphygas to determine if the proportion of lizards with tail loss was different between populations, sexes, and age classes. Also, we estimated unbroken and regenerated tail…
Fecha:	2011-03-01
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81.

Variation in parental investment and relative clutch mass of the spiny-tail iguana, Ctenosaura pectinata (Squamata: Iguanidae) in central México
Castro-Franco,Rubén - Bustos-Zagal,María Guadalupe - Méndez-De la Cruz,Fausto R.

Formato:	journal article
Enlaces:	We measured the length, width, volume, and weight of 871 freshly laid eggs of 28 clutches of Ctenosaura pectinata. The iguanas were obtained from a tropical dry forest area in central Mexico. The relative clutch mass was related positively to…
Fecha:	2011-03-01
Recurso:	SCIELO

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82.

Impact of anthropogenic disturbances on the diversity of shallow stony corals in the Veracruz Reef System National Park
Gutiérrez-Ruiz,Carla V. - Román-Vives,Miguel A. M. - Vergara,Carlos H. - Badano,Ernesto I.

Formato:	journal article
Enlaces:	Anthropogenic disturbances may affect the development and maintenance of coral reefs by promoting diseases and other syndromes. In turn, this may cause local decreases in coral species diversity. In this study, we compared the prevalence of syndromes (including diseases and…
Fecha:	2011-03-01
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83.

A new record for American Bullfrog (Lithobates catesbeianus) in San Juan, Argentina
Sanabria,Eduardo - Ripoll,Yanina - Jordan,Marcelo - Quiroga,Lorena - Ariza,Mariano - Guillemain,María - Pérez,Mauricio - Chávez,Héctor

Formato:	journal article
Enlaces:	We report a new record of Lithobates catesbeianus (American bullfrog) from Argentina. L. catesbeianus was first introduced to San Juan Province 11 years ago in Calingasta Department, where the habitat is pre-cordilleran. The new record is for Zonda Department, San…
Fecha:	2011-03-01
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84.

Observations on nests of Crocodylus moreletii in San Luis Potosí, Mexico
Escobedo-Galván,Armando H. - Casas-Andreu,Gustavo - Barrios-Quiroz,Gabriel - Sustaita-Rodríguez,Víctor H. - López-Luna,Marco A.

Formato:	journal article
Enlaces:	Nesting ecology of Morelet's crocodile (Crocodylus moreletii) has been documented since 1940. However, only 2 nests constructed on floating vegetation have been recorded. Here, we presented additional information from a mainland population of C. moreletii in the Ciénega de Cabezas…
Fecha:	2011-03-01
Recurso:	SCIELO

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85.

Electrical resistivity imaging of a seismic region in northern Baja California, Mexico
Carpio,Ricardo Antonio - Romo,José Manuel - Frez,José - Gómez-Treviño,Enrique - Suárez-Vidal,Francisco

Formato:	journal article
Enlaces:	Magnetotelluric (MT) observations collected at 17 sites along a 45-km profile were used to investigate the electrical conductivity structure in the Ojos Negros seismic zone, in northern Baja California, Mexico. In this region, seismic activity registered by a local network…
Fecha:	2011-03-01
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86.

A case study of a winter heavy rainfall event over the Serra do Mar in Brazil
Seluchi,Marcelo E. - Chan Chou,Sin - Gramani,Marcelo

Formato:	journal article
Enlaces:	Serra do Mar is a mountainous region vulnerable to landslides due to frequent summer heavy rainfall and steep slopes. These mountains are located in Southeastern Brazil and lie along the coastal region. Major cities, industries, roads and pipelines are established…
Fecha:	2011-03-01
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87.

Unified formulation of enhanced oil-recovery methods
Herrera,Ismael - Herrera,Graciela S.

Formato:	journal article
Enlaces:	At present enhanced oil recovery (EOR) techniques are essential for maintaining the oil supplies of the world. In turn, mathematical and computational models of the processes that occur in EOR are fundamental for the application and advancement of such methods.…
Fecha:	2011-03-01
Recurso:	SCIELO

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88.

Chemical composition and antimicrobial activity of oregano (Lippia palmeri S. Wats) essential oil
Ortega-Nieblas,Ma. Magdalena - Robles-Burgueño,Ma. Refugio - Acedo-Félix,Evelia - González-León,Alberto - Morales-Trejo,Adriana - Vázquez-Moreno,Luz

Formato:	journal article
Enlaces:	The chemical composition and antimicrobial activity of Lippia palmeri S. Wats essential oil extracted from plants collected of two localities (Álamos and Puerto del Orégano) in the State of Sonora, México, was examined. Essential oils (EO) were obtained from oregano…
Fecha:	2011-03-01
Recurso:	SCIELO

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89.

Semantic Representation of Raster Spatial Data
Quintero Téllez,Rolando

Formato:	journal article
Enlaces:	When people think spatially, they do not usually consider geographic coordinates nor projections. Facing questions having a spatial sense, people do not answer with maps or coordinates, but use some references whose spatial location is "well known". For instance, the…
Fecha:	2011-03-01
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90.

Digitally Addressable Digital Dimming Electronic Ballast Based on CAN Bus
Rodríguez-Segura,E - Díaz-Carmona,J - Hurtado-Chávez,L - Vázquez-Nava,N - Correa-Gómez,J

Formato:	journal article
Enlaces:	This paper describes the design and implementation of a new digital dimming electronic ballast with the capability of being remotely controlled in a digital way, this is achieved through a novel lighting network based on Controller Area Network (CAN) bus…
Fecha:	2011-03-01
Recurso:	SCIELO

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91.

Myocardial postconditioning: anesthetic considerations
Luna-Ortiz,Pastor - Torres,Juan Carlos - Pastelin,Gustavo - Martínez-Rosas,Martín

Formato:	journal article
Enlaces:	Recently, it has been shown that the heart can be protected against the ischemia-reperfusion injury if brief coronary occlusions are performed just at the beginning of the reperfusion. This procedure has been called postconditioning (PostC). It can also be elicited…
Fecha:	2011-03-01
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92.

Laminar Horseshoe Vortices Upstream of a Short Cylinder Normal to a Flat Plate
Rodríguez y Domínguez,Marcos Matthaeus - Romero-Méndez,Ricardo - De Lange,Dirk Frederik - Hernández-Guerrero,Abel

Formato:	journal article
Enlaces:	A flow visualization experiment was performed in order to characterize the laminar horseshoe vortex system that appears upstream of the ¡unction of a short cylinder and a single flat plate parallel to the flow direction. The experiments were performed in…
Fecha:	2011-03-01
Recurso:	SCIELO

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93.

Simulating elastic wave propagation in boreholes: Fundamentals of seismic response and quantitative interpretation of well log data
Ávila-Carrera,Rafael - Spurlin,James H. - Valle-Molina,Celestino

Formato:	journal article
Enlaces:	An analytic formulation oriented to understand the diffraction, dispersion and attenuation of borehole propagation modes is presented. The main aim of this article is to report to the scientific community the fundamentals of the seismic response at the well neighborhood,…
Fecha:	2011-03-01
Recurso:	SCIELO

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94.

The Chicxulub multi-ring impact crater, Yucatan carbonate platform, Gulf of Mexico
Urrutia-Fucugauchi,Jaime - Camargo-Zanoguera,Antonio - Pérez-Cruz,Ligia - Pérez-Cruz,Guillermo

Formato:	journal article
Enlaces:	The Chicxulub impact crater is part of a select group of unique geological sites, being a natural laboratory to investigate crater formation processes and global effects of large-scale impacts. Chicxulub is one of only three multi-ring craters documented in the…
Fecha:	2011-03-01
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95.

Editorial
Gelbukh,Alexander

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-06-01
Recurso:	SCIELO

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96.

Dr. Estela Sánchez Quintanar
Loyola-Vargas,Víctor M.

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2012-03-01
Recurso:	SCIELO

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97.

Special Issue of the J. Mex. Chem. Soc. in Honor of Dr. Ernest L. Eliel (1921-2008)
Juaristi,Eusebio - Tamariz,Joaquín - Delgado,Guillermo

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-09-01
Recurso:	SCIELO

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98.

Dr. Mario Acuña
Valdés Galicia,José Fco.

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-06-01
Recurso:	SCIELO

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99.

Contemporary issues on bone health and related diseases
Hernández Ávila,Mauricio

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-01-01
Recurso:	SCIELO

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100.

Osteoporosis in Mexico: "the challenge"
Clark,Patricia

Formato:	journal article
Enlaces:	Descripción completa.
Fecha:	2009-01-01
Recurso:	SCIELO