28 research outputs found
An Investigation of the Crystal Structure of dichloro-μ-tetra(n-butyrato)dirhenium(III)
No full textTitle: An Investigation of the Crystal Structure of dichloro-μ-tetra(n-butyrato)dirhenium(III), Author: Roderic J. Restivo, Location: ThodeDichloro-μ-tetra(n-butyrato)dirhenium(III) was examined by x-rays and found to consist of a centrosymmetric dimeric unit in an eclipsed rotomeric configuration with a short rhenium-rhenium bond length of 2.20(2)Å. A long rhenium-chlorine bond 2.53(1)Å is present in the molecular unit. The bonding in Re2(O2C.C3H7-N)4CL2 is discussed with reference to similar carboxylate dimer structures. A preliminary report on the structure of Re2(O4C.C3H7-N)2 is also presented.ThesisMaster of Science (MS
Rod Korns
No full textPhoto showing J. Roderic ("Rod") Korns, a historian of western trails and author of "West from Fort Bridger
ChemInform Abstract: CRYSTAL AND MOLECULAR STRUCTURE OF ENDO,ENDO‐2,6‐BIS(PHENYLCARBAMOYLOXY)‐CIS‐BICYCLO(3.3.0)OCTANE
No full textFrancisco J. Múgica y su candidatura frustrada a la presidencia de México en 1940. Historias. Revista de la Dirección de Estudios Históricos. Num. 68 (2007) septiembre-diciembre
No full textGonzalo N. Santos, Memorias. México, Grijalbo, 1986 (Testimonios), p. 647.Ariel José Contreras, México 1940. Industrialización y crisis política. México. UNAM/Siglo XXI, 1992, pp. 14-16.Arnaldo Córdova, La ideología de la Revolución Mexicana. Formación del nuevo régimen. México, Era (El Hombre y su Tiempo), 1973, p. 198.Pastor Rouaix, Génesis de los árticulos 27 y 123 de la Constitución Política de 1917, México, Biblioteca del Instituto Nacional de Estudios Históricos de la Revolución Mexicana, 1959, p. 63.Guadalupe García Torres, Carolina Escudero Luján, una mujer en la historia de México. Testimonio oral, Michoacán, Instituto Michoacano de Cultura/CERMLC, A.C. 1992, pp. 23-24.Fernando Benítez, Entrevistas con un solo tema: Lázaro Cárdenas, México, UNAM, Facultad de Ciencias Políticas y Sociales (Serie Estudios, 61), 1979. p. 86.Anna Ribera Carbó, La patria ha podido ser flor. Francisco J. Múgica, una biografía política, México, INAH, 1999; Anna Ribera Carbó, “Prólogo” a Francisco J. Múgica, Estos mis apuntes, México, CNCA (Memorias Mexicanas), 1997.Magdalena Mondragón, Cuando la Revolución se cortó las alas, México, B. Costa-Amic, 1966, p. 42.José Fuentes Mares, La revolución mexicana. Memorias de un espectador, México, Grijalbo, 1986, p. 190.José Agustín, Tragicomedia mexicana I. La vida en México de 1940 a 1970, México, Planeta, 1992, p. 7.Alfonso Taracena, La revolución desvirtuada, tomo VII-año 1939, México Costa-Amic Editor, 1970.Salvador Novo, La vida en México en el periodo presidencial de Lázaro Cárdenas, México, Empresas Editoriales, 1964, pp. 288-291.Clave, marzo de 1939. Citado en Olivia Gall, “Un solo visado en el planeta para León Trotsky”, en Pablo Yankelevich (coord.), México, país refugio. La experiencia de los exilios en el siglo xx, México, INAH/Plaza y Valdés, 2002, pp. 72-74.Luis Bernal Tavares, Vicente Lombardo Toledano y Miguel Alemán: una bifurcación de la Revolución Mexicana, México, Centro de Estudios e Investigación para el Desarrollo Social, Facultad de Filosofía y Letras-UNAM, 1994, pp. 94-95Daniel Cosío Villegas, La sucesión presidencial, México, Cuadernos de Joaquín Mortiz, 1975, p. 56.Roderic Ai Camp, Reclutamiento político en México, México, Siglo XXI, 1996, pp. 47-48La expropiación petrolera de 1938, colofón del proceso de reformas del cardenismo, tuvo un alto costo. A partir de ella, y como consecuencia de las presiones económicas originadas en el exterior, hubo una crisis económica y política que obligó a hacer más lento el programa de cambios. El presidente Lázaro Cárdenas tuvo que conciliar incluso con sectores de su propio partido que pedían poner freno al radicalismo. Las fuerzas contrarias al proyecto cardenista iban en ascenso dentro y fuera del país, y para finales de 1940 se encontraba a la defensiva.In 1940, Lázaro Cárdenas’ presidential period was coming to an end. Within the PRM (Partido de la Revolución Mexicana), the official party, three generals and politicians fought for the presidential candidacy. Francisco J. Múgica, a former representative in the Constitutional Congress of 1917 and very close to Cárdenas social policies, seemed to be the favorite. Very soon, moderate and conservative politicians within and without the PRM received important support from social groups that aimed to put an end to Cárdenas’ radicalism. The PRM finally chose Manuel Ávila Camacho as its candidate. Cárdenas agreed with the party’s decision as a way to deter conservative radicals by supporting a moderate candidate.</p
Metal-olefin complexes: Synthesis and molecular structure of trans-chloro(ethylene)bis(triphenylphosphine)iridium(I), IrCI(C2H4)(PPh3)2
No full textStructural studies of steric effects in phosphine complexes. Synthesis and crystal and molecular structure of the dinitrato(tricyclohexylphosphine)mercury(II) dimer
No full textTumor inhibitors. LXXXX. Steganacin and steganangin, novel antileukemic lignan lactones from Steganotaenia araliacea
No full textViscoelastic properties of bone: Mechanical spectroscopy studies on a chicken model
No full texthe mechanical behaviour of bone exhibits a time-dependent response, as a consequence of its viscoelastic character. New materials for biomedical applications should have similar time-dependent mechanical behaviour as bone (viscoelastic biocompatibility). Hence, it is important to evaluate the properties of bone and to understand the underlying mechanism responsible for its damping features. In this work the solid-state theological properties were studied in chicken bone. Fresh ulna specimens were tested using dynamic mechanical analysis in the temperature range -50 to 80 &DEG; C, at a constant frequency of 1 Hz. A broad tan 6 peak was found between -50 and 30 &DEG; C, that was attributed to melting of water and molecular mobility involving collagen molecules. A minimum in the loss factor was detected at physiological temperature, which is consistent with isothermal results previously reported. It was hypothesised that this behaviour would have a physiological significance and could be associated to some damage process occurring within the organic phase caused by energy absorption during cyclic loading. This minimum is not detected in the demineralised bone or in collagen, indicating that the specific interactions between the collagen molecules and the apatite crystals, as well as the complex hierarchical organisation of the bone structure, are designed to reduce damping at functional time scales. A broad loss process was observed at low temperature in collagen. Local molecular motions at low temperatures occurring in collagen molecules could enhance bone toughness. Creep tests also revealed bone viscoelasticity features, and are useful to monitor irrecoverable strain upon static loads, which could be mainly a consequence of structural damage, rather than pure-viscous flow.Financial support for this work was provided by FCT, through the POCTI and FEDER programmes. The author thanks Prof. Mrinal Bhattacharya (University of Minnesota) for the fruitful comments on the manuscript and Prof. Roderic Lakes (University of Wisconsin) for providing valuable information.info:eu-repo/semantics/publishedVersio
The Mental Machine: Classifying Mental Workload State from Unobtrusive Heart Rate- measures using Machine Learning
No full textThis paper investigates whether mental workload can be classified in an operator setting using unobtrusive psychophysiological measures. Having reliable predictions of workload using unobtrusive sen- sors can be useful for adaptive instructional systems, as knowledge of a trainee’s workload can then be used to provide appropriate train- ing level (not too hard, not too easy). Previous work has investigated automatic mental workload prediction using biophysical measures and machine learning, however less attention has been given to the level of physical obtrusiveness of the used measures. We therefore explore the use of color-, and infrared-spectrum cameras for remote photoplethys- mography (rPPG) as physically unobtrusive measures. Sixteen expert train traffic operators participated in a railway human-in-the-loop sim- ulator. We used two machine learning models (AdaBoost and Random Forests) to predict low-, medium- and high- mental workload levels based on heart rate features in a leave-one-out cross-validated design. Results show above chance classification for low- and high- mental workload states. Based on infrared-spectrum rPPG derived features, the AdaBoost machine learning model yielded the highest classification performance
Author Correction: Expanded encyclopaedias of DNA elements in the human and mouse genomes
No full textIn the version of this article initially published, two members of the ENCODE Project Consortium were missing from the author list. Rizi Ai (Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA) and Shantao Li (Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, USA) are now included in the author list. These errors have been corrected in the online version of the article
