4,809 research outputs found
Conformational analysis of cyclohexyl hydroperoxide by rotational spectroscopy
No full texthttp://dx.doi.org/10.13039/100005156 Alexander von Humboldt-Stiftunghttp://dx.doi.org/10.13039/501100001659 Deutsche Forschungsgemeinschaf
Iglesia de San Pablo del Monte: Tlaxcala
No full textLa construcción del templo de San Pablo del Monte se remonta al siglo XVI. En un primer momento estuvo dedicado a San Miguel Arcángel, y poco tiempo después fue brindado al apóstol San Pablo. El templo fungió como visita del convento franciscano de Puebla, junto con las poblaciones de San Miguel Tenancingo, San Francisco Papalotla y San Cosme Mazatecochco.</p
Progressive polarization of phenanthridine with increasing hydration degree evidenced by quadrupole and its comparison with formamide clusters
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Previous issue date: 2019-06-18The structure of the microsolvated complexes of phenanthridine (PAN) with up to three water molecules has been investigated previously using chirped pulse Fourier transform microwave (CP-FTMW) spectroscopy from 2-8 GHz. In this work, the effect of Resonance Assisted Hydrogen Bonding (RAHB), also called \textit{}–cooperativity, on those complexes has been studied. In the resonant forms, the increase of the electronic density around the nitrogen nucleus enhances its hydrogen acceptor capabilities. Thus, the main effects expected due to the resonance of the multiple conjugated \textit{}–bonds in the structure of the complexes are a strengthening of the hydrogen bonds and a lengthening of the N-C bonds. However, due to the subtle changes that occur on the molecular structure, the effect on the N-C distances could not be detected experimentally and only a shortening of the hydrogen bonds has been observed. Therefore, the use of the quadrupole coupling interactions as a probe for the polarization has been used to investigate these effects on the almost planar structures of PAN-(HO) n=1-3. This form of analysis has been shown to be effective in similar studies with formamide.\footnote{S. Blanco, P. Pinacho, J. C. López, \textit{Angew. Chem. Int. Ed.}, 2016, \textbf{128}, 9477-9481.}\footnote{S. Blanco, P. Pinacho, J. C. López, \textit{J. Phys. Chem. Lett.}, 2017, \textbf{8}, 6060-6066.} The experimental quadrupole coupling constant \textit{} shows a clear trend from isolated PAN to complexes with higher hydration degree, illustrating how the electronic environment at the N nucleus is altered by microsolvation
The many forms of alpha-methoxy phenylacetic acid in the gas phase: flexibility, internal dynamics, and their intramolecular interactions
No full textFive conformers of the flexible molecule alpha-methoxy phenylacetic acid were identified using rotational spectroscopy. The conformational landscape, internal dynamics, and intramolecular interactions were investigated.We present a rotational spectroscopy study of alpha-methoxy phenylacetic acid in the gas phase. This acid is a derivative of mandelic acid and is used in various organic reactions. The conformational landscape of alpha-methoxy phenylacetic acid was explored to gain insight into its intramolecular dynamics. A rich rotational spectrum was obtained using chirped-pulse Fourier transform microwave spectroscopy in the 2–8 GHz range. Five conformers out of six calculated low-energy forms were identified in the spectrum, and the assignment of the
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C singly substituted isotopologues for the lowest-energy conformer led to its accurate structure determination. Splitting patterns were analyzed and attributed to the internal rotation of a methyl top. The analysis of the non-covalent interactions within the molecule highlights the subtle balance in the stabilization of the different conformers. We thus provide high-level structural and intramolecular dynamics information that is also used to benchmark the performance of quantum-chemical calculations.Deutsche Forschungsgemeinschaft https://doi.org/10.13039/501100001659Fundación Alfonso Martín Escudero https://doi.org/10.13039/100008052Alexander von Humboldt-Stiftung https://doi.org/10.13039/100005156Agencia de Innovación y Desarrollo de Andalucía https://doi.org/10.13039/50110000646
Suplementary material for : Exploring atmospheric nucleation processes: hydration and fluoroalcoholic complexation of pyruvic acid
No full textPeer reviewe
Palabra de Pablo: 100 años después
No full text[ES] Documento que constituye una selección de textos sobre Pablo de la Torriente Brau, con ocasión del centenario de su nacimiento, recopilados por Víctor Casaus. En ella, se recorre, además, la vida del autor a través de los textos que le dedicaran los escritores cubanos desde su fallecimiento hasta nuestros días.[EN] Document that constitutes a selection of texts on Pablo de la Torriente Brau, on the occasion of the centenary of his birth, compiled by Víctor Casaus. In it, the life of the author is crossed, in addition, across the texts that him the Cuban writers were dedicating from his death to the present day
Escáner de seguridad y métricas de riesgo operacional para chatbots basados en LLMs.
No full textTesis presentada para optar al título de Ingeniero/a Civil Informático/a.Recientemente han ocurrido enormes avances en el área de los chatbots y grandes modelos de lenguaje (LLM), principalmente potenciado y popularizado por el lanzamiento de ChatGPT el pasado 30 de noviembre de 2022 [1]. Un chatbot es un programa de computador que simula y procesa conversaciones humanas (ya sea escritas o habladas), permitiendo a los humanos interactuar con dispositivos digitales como si estuvieran comunicándose con una persona real [2]. Sin embargo, hasta hace unos meses, la mayoría de estos chatbots constaban con una limitada capacidad de interacción, con respuestas automáticas o muy simples.Facultad de IngenieríaDepartamento de Ingeniería Informática y Ciencias de la ComputaciónConcepció
Un siglo en 100 artículos
No full textFicha técnica:
Justino SinovaLa esferaMadrid, 2002526 pp.ISBN: 978-84-973-4031-
Neoliberalismo: críticas y resistencias. Entrevista a Juan Pablo Rodríguez
No full textLa siguiente entrevista aborda algunas de las principales motivaciones, ideas y conclusiones que dan forma a la investigación contenida en el libro Resisting neoliberal capitalism in Chile: the possibility of social critique (2020) de Juan Pablo Rodríguez. Se aborda, en primer lugar, su examen de distintas teorías críticas del neoliberalismo contemporáneo; a continuación, su análisis de las prácticas de crítica situada que llevan a cabo los movimientos sociales en Chile, en especial a partir de los casos del movimiento estudiantil y el movimiento de pobladores.
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In this interview with Juan Pablo Rodríguez, author of Resisting neoliberal capitalism in Chile: the possibility of social critique (2020), we address the main ideas and motivations behind the book and the research on which the book is based. We first explore the analysis the author makes of different theoretical critiques of contemporary neoliberal capitalism, and then we talk about the practices of embodied critiques carried out by social movements in Chile, focusing on the cases of the student and the pobladores movements
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