43,489 research outputs found
Adsorptive removal of ascertained and suspected endocrine disruptors from aqueous solution using plant-derived materials
No full textThe present study deals with the use of low-cost plant-derived materials, namely a biochar, spent coffee grounds, spent tea leaves, and a compost humic acid, for the adsorptive removal from water of two estrogens, 4-tert-octylphenol (OP) and 17-β-estradiol (E2), and two pesticides, carbaryl and fenuron, each spiked at a concentration of 1 mg L−1. Kinetics and adsorption isotherms have been performed using a batch equilibrium method to measure the sorption capacities of the adsorbents towards the four molecules. Adsorption constants were calculated using the linear, Freundlich, and Langmuir models. Kinetics data obtained evidenced a rapid adsorption of each compound onto both biochar and coffee grounds with the attainment of a steady-state equilibrium in less than 4 h. Significant differences among the adsorbents and the compounds were found regarding the model and the extent of adsorption. In general, the estrogens were adsorbed more quickly and in greater amounts than the less hydrophobic pesticides, following the order: OP > E2 > carbaryl > fenuron. The ranges of Freundlich constants obtained for OP, E2, carbaryl, and fenuron onto the sorbents were 5049–2253, 3385–206, 2491–79, and 822–24 L kg−1, respectively. The maximum values of constants were obtained for biochar, except for OP that was more adsorbed by spent coffee grounds. Adsorption kinetic data followed a pseudo-second-order model, thus indicating the occurrence of chemical interactions between the compounds and the substrates. The remarkable sorption capacities of all adsorbents towards the four molecules suggest the valuable exploitation of these materials for decontamination purposes, such as the treatment of wastewater before a feasible recycle in soil
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
Conservatismo en el simbolismo de Oaxaca: un breve informe.. Anales del Instituto Nacional de Antropología e Historia. Num. 49 Tomo I (1967-1968) Séptima Época (1967-1976)
No full textCaso, A. 1928 Las Estelas Zapotecas. Monografías del Museo Nacional de Arqueología, Historia y Etnografía. México.Caso, A. y Bernal, l. 1952 Urnas de Oaxaca. Memorias del Instituto Nacional de Antropología e Historia, II. México.Boos, Frank H. 1964 Las Urnas Zapotecas en el Museo Real de Ontario. Corpus Antiquitatum Americanensium, vol. l. Instituto Nacional de Antropología e Historia. México.Boos, Frank H. 1965 The Oaxacan Urn of the Zapotec God One Z and the Urn of his Feminine Companion. Wadsworth Athenaeum Bulletin. Sixth series, vol. 1. No. 2. Hartford, Connecticut.Boos, Frank H. 1966 The Ceramic Sculptures of Ancient Oaxaca. A. S. Barnes & Co., New York y Thomas Yoseloff Ltd., London.Leigh, H. 1958 An Identification of Zapotec Day Names. Boletín de Estudios Oaxaqueños, No. 6. Mexico City College, México.Paddock, J. 1966 Ancient Oaxaca. Stanford University Press
Contribution of Information and Communication Technology (ICT) in Country’S H-Index
No full textThe aim of this study is to examine the effect of Information and Communication Technology (ICT) development on country’s scientific ranking as measured by H-index. Moreover, this study applies ICT development sub-indices including ICT Use, ICT Access and ICT skill to find the distinct effect of these sub-indices on country’s H-index. To this purpose, required data for the panel of 14 Middle East countries over the period 1995 to 2009 is collected. Findings of the current study show that ICT development increases the H-index of the sample countries. The results also indicate that ICT Use and ICT Skill sub-indices positively contribute to higher H-index but the effect of ICT access on country’s H-index is not clear
. 49 Tomo I (1967-1968) Séptima Época (1967-1976). Anales del Instituto Nacional de Antropología e Historia
No full textPublicación que recopila y difunde cien años de trabajo de la antropología en México (1877-1977), integrada por documentos y manuscritos arqueológicos, antropológicos, históricos, geológicos, botánicos y lingüísticos.- Información general de las actividades del Instituto Nacional de Antropología e Historia durante los años 1967-1968 por Ignacio Bernal. - Dos elementos de uso ritual en el arte olmeca por María Antonieta Cervantes. - Las ruinas del Rancho de San Pablo, Becanchén, Yucatán por William J. Folan. - Reconocimiento del sitio Varejonal, municipio de Jiquipilas, Chiapas por Pierre Agrinier. - Conservatismo en el simbolismo de Oaxaca: un breve informe por Frank H. Boos. - La lengua de Huehuetán (Maliwi) por Carlos Robles Uribe y Roberto D. Bruce S. - Términos de parentesco del náhuatl. Dialecto del norte de Puebla por Earl Brockway. - Un nexo prehistórico entre quechua y tarasco por Mauricio Swadesh. - El tuzanteco y su posición dentro de la familia mayense por Otto Schummann. - Noticia del mame de Tuxtla Chico por Roberto H. Escalante. - Differential Pueblos specialization in fetishes and shrines por Florence Hawley Ellis. - Una leyenda mixteca por Jorge Poulat Legorreta. - Los pimas bajos de la Sierra Madre Occidental por Margarita Nolasco Armas. - Los choloques y los cholultecas. Apuntes sobre las relaciones étnicas en Cholula hasta el siglo XVI por Mercedes Olivera y Cayetano Reyes. - Fray Servando Teresa de Mier y la Sociadad Lautaro por José R. Guzmán. - Casas en que vivió el capitán don Juan de Chavarría Valera por Pedro Álvarez y Gasca
James H. Cathey Author of "Genesis of Lincoln"
No full textThis undated photograph showing James H. Cathey (1866-1929) is part of the William E. Bird Collection. On the back of the photograph is written “James H Cathey Senator from Jackson, Transylvania, Haywood, Swain. Author of ‘Genesis of Lincoln.’” William Ernest Bird (1890-1975) was born in the Qualla community of Jackson County, NC. Bird served Western Carolina University in various capacities during his long career. Bird’s roles at WCU included head of the English Department, Dean of Men, Acting President, and President. In 1963, he published The History of Western Carolina College: The Progress of an Idea. He was married to Myrtle Wells (1891-1983)
. 45 Tomo XVI (1963) Sexta Época (1939-1966). Anales del Instituto Nacional de Antropología e Historia
No full textPublicación que recopila y difunde cien años de trabajo de la antropología en México (1877-1977), integrada por documentos y manuscritos arqueológicos, antropológicos, históricos, geológicos, botánicos y lingüísticos.- Información general de las actividades del Instituto Nacional de Antropología e Historia durante el año 1963 por Eusebio Dávalos Hurtado. - La decimotercera temporada de exploraciones en Tula, Hgo. por Jorge R. Acosta. - El dios mariposa en la cultura de Oaxaca. Una revisión del estado actual del conocimiento por Frank H. Boos. - Datos sobre los ángulos de torsión y retroversión en restos prehispánicos del norte de México por Carlos Serrano, Sergio López Alonso y Zaid Lagunas. - Craneología y criminología por Carlos Serrano y Anselmo Marino Flores. - Material lingüístico del oriente de Sonora, Tonichi y Pónida por Roberto Escalante H. - Los fonemas del maya-yucateco por Moisés Romero Castillo. - Lenguas del sur de Estados Unidos y el norte de México. Un suplemento por Robert J. Weitlaner. - Notas sobre la población de Santa María Chigmecatitlán por Leonardo Manrique Castañeda. - Dos cuentos por José de Jesús Montoya Briones. - La lírica popular de la costa michoacana por Thomas Stanford. - Descripción geographica de los reinos de Galicia, Vizcaya y León. (Con advertencia de Antonio Pompa y Pompa) por Alonso de la Mota y Escobar
Raza, fobias e intolerancias. Num. 31 (2004) Vol. 11 mayo-agosto. Cuicuilco Revista de la Escuela Nacional de Antropología e Historia
No full text- Presentación, por Pablo Yankelevich - Dossier: - La singularidad de Auschwitz. Un debate sobre el uso público de la historia, por Enzo Traverso - El científico frente a la “crisis” de la civilización. Una aproximación a La incógnita del hombre de Alexis Carrel, por Andrés H. Reggiani - ¿Quiénes deben procrear? Los médicos eugenistas bajo el signo social (México, 1931-1940), por Marta Saade Granados - Ni blancos ni negros: mexicanos. El papel de la Patrulla Fronteriza estadounidense en la definición de una nueva categoría racial. 1924-1940, por Kelly Lytle Hernández - Nación y extranjería en el México revolucionario, por Pablo Yankelevich - Miscelánea: - El indigenismo como antropología aplicada, algunos apuntes a contrapunto, por José Palacios Ramírez - Una aproximación teórica a James C. Scott, por Mercedes Henríquez y España - Paradojas de la historia ejidal: El Llanito, Dolores Hidalgo, Guanajuato, 1930-1960, por Manola Sepúlveda Garza - Presencia de esterilidad: actores o sujetos en la actualidad, por Mayra L. Chávez-Courtois - Homosexualidad y género, por Magali Díaz Álvarez - Mente, intencionalidad y autopoiesis. Una heurística antropológica, por Jorge H. Flores Trejo
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