Search results for "Craft"
showing 10 items of 369 documents
Enantioselective Zirconium-Catalyzed Friedel−Crafts Alkylation of Pyrrole with Trifluoromethyl Ketones
2009
The first catalytic enantioselective Friedel-Crafts alkylation of pyrrole with 2,2,2-trifluoroacetophenones to give pyrroles with a trifluoromethyl-substituted tertiary alcohol moiety bearing a quaternary stereogenic center is described. The reaction is achieved in the presence of a 3,3'-dibromo-BINOL-Zr(IV) complex to give the expected products with high yields (up to 98%) and good enantioselectivities (up to 93% ee). The absolute stereochemistry of the products has been determined by chemical correlation.
En busca del lenguaje del horror: H. P. Lovecraft según Alberto Breccia
2009
El presente trabajo se aboca al análisis de las transposiciones que realizara Alberto Breccia de Los mitos de Chtulhu de H. P Lovecraft durante la década del setenta. Proponemos que efectivamente existe una relación entre esta etapa de mayor experimentación formal de Breccia —cuyas técnicas se vinculan estrechamente con las vanguardias pictóricas— y sus elecciones temáticas, es decir, la selección de ciertos clásicos literarios vinculados al horror y a la literatura gótica a partir de los cuales el autor llevará a cabo sus innovadoras versiones historietísticas. En segundo lugar, se avanzará en el análisis de la interpretación y presentación que Breccia realiza de ciertos problemas propios …
Feeling Upside Down: Witchcraft and Exclusion in the Twilight of Early Modern Spain
2019
In mid-1812, in the village of Tosos (Zaragoza), more than thirty-two of the inhabitants claimed to be possessed. Most of the population accepted the supernatural explanation of maleficence and cast the blame on one woman, Joaquina Martínez, who was labelled a witch and sorceress and whose life was threatened on several occasions thereafter, until she was definitively expelled from the village. Had this happened in the 16th or 17th century, Joaquina would have been tried and awarded a harsh sentence.Two centuries on from the end of the “witch-hunt”, however, as if in a “looking-glass world”, those brought to trial were her persecutors.The episcopal trial of the so-called “possessed of Tosos…
Acid Catalysis with Alkane/Water Microdroplets in Ionic Liquids
2021
Ionic liquids are composed of an organic cation and a highly delocalized perfluorinated anion, which remain tight to each other and neutral across the extended liquid framework. Here we show that n-alkanes in millimolar amounts enable a sufficient ion charge separation to release the innate acidity of the ionic liquid and catalyze the industrially relevant alkylation of phenol, after generating homogeneous, self-stabilized, and surfactant-free microdroplets (1–5 μm). This extremely mild and simple protocol circumvents any external additive or potential ionic liquid degradation and can be extended to water, which spontaneously generates microdroplets (ca. 3 μm) and catalyzes Brönsted rather …
Reacciones de Friedel-Crafts enantioselectivas de naftoles, fenoles e hidroxiindoles catalizadas por derivados de alcaloides de la Cinchona
2016
Durante los últimos años, han sido descritos numerosos ejemplos de reacciones enantioselectivas con hidroxiarenos, especialmente usando organocatalizadores bifuncionales. A pesar de ello, la funcionalización asimétrica de hidroxiarenos ha sido menos estudiada si la comparamos con reacciones de Friedel-Crafts con indoles o pirroles. Además, el alcance de la reacción respecto del nucleófilo es limitado en muchos casos. En el capítulo 2.2, se describe una descripción detallada de todos las reacciones de Friedel-Crafts enantioselectivas con hidroxiarenos descritas en la bibliografía. En este contexto, durante la presente tesis hemos descrito el desarrollo de nuevos métodos para la funcionalizac…
O czary, próbę spędzenia płodu, bigamię i czyny nierządne. Proces Barbary z Krzyżanowskich 1o Krępska, 2o Lenartowiczowej w Barze w 1764 roku. Edycja…
2022
Wzmiankowany w tytule proces sądowy odbył się 18 lipca 1764 roku. Oskarżono w nim Barbarę z Krzyżanowskich primo Krępską, secundo Lenartowiczową o przywłaszczenie spadku po mężu, który zgodnie z prawem powinien przypaść jego córce z pierwszego małżeństwa Annie. Sprawę do sądu wniósł jej mąż Jan Szcześniacki. W trakcie procesu okazało się, że Barbara winna była jeszcze kilku innych przestępstw zagrożonych bezwzględną karą śmierci jak bigamia, próba przerwania ciąży oraz kontakty intymne z parobkiem Iwanem Zemkowem, który z tego powodu był wyśmiewany przez kolegów. Jednym z poważnych zarzutów były czary, które oskarżona miała rzekomo rzucić na kochanka oraz byłego męża, który z ich powodu mia…
Design of the stabilization control system of a high-speed craft
2016
In this paper, the main causes of technical malfunction of a hydrofoil was analyzed. In particular, a preliminary analysis evaluates the economic impact for the navigation company of the periodical maintenance related to the keeping of the vessel in dry dock. The study demonstrated that the main critical points are focused on the fragility of the stabilization control system. The increasing of operating costs has motivated the realization of a study aimed at redesigning the stabilization system. The continuing failure of the stabilization system (usually in water-immersed) severely limits the use of the high-speed craft. The proposed design solution considers the positioning of the control …
Training Deep Neural Networks with Novel Metaheuristic Algorithms for Fatigue Crack Growth Prediction in Aluminum Aircraft Alloys
2022
Fatigue cracks are a major defect in metal alloys, and specifically, their study poses defect evaluation challenges in aluminum aircraft alloys. Existing inline inspection tools exhibit measurement uncertainties. The physical-based methods for crack growth prediction utilize stress analysis models and the crack growth model governed by Paris’ law. These models, when utilized for long-term crack growth prediction, yield sub-optimum solutions and pose several technical limitations to the prediction problems. The metaheuristic optimization algorithms in this study have been conducted in accordance with neural networks to accurately forecast the crack growth rates in aluminum alloys. Through ex…
A Real-time Linux based controller for micro-vibration generating with voice coil actuator
2014
The micro-vibrations generated by mechanical systems onboard spacecraft can affect the performance of instruments with high pointing accuracy and stability. This paper provides a micro-vibration generating control system based on Real Time Application Interface (RTAI), a real time Linux extension, for ground tests purposes. The vibration generating control algorithm is filtered-X adaptive inverse control method. A voice coil actuator is used in the vibration generating experiments. The experiments show that the system can generate different frequency precision sine vibration whose error is less than 2 mg which is in environmental and electrical noise level.
Streghe per Covid. Le accuse di stregoneria in India durante la pandemia di Coronavirus
2020
This survey aims to present an initial assessment of the incidence of the phenomenon of witch-hunting in India during 2020, at a particularly dramatic historical moment marked by the outbreak of the Covid 19 pandemic. The data are partial, but indicative, and have been gathered through daily monitoring of the main Indian newspapers in English and some newspapers (national and local) in Hindi. In India, the belief in witches is a phenomenon that is linked to specific elements both of Hindu cults, whose devotional expressions and folkloric elements are rooted in the Vedic texts, and the belief systems of some indigenous communities. Indeed, although influenced by the expressions of the Hindu …