Search results for "Carn"

Combined theoretical and experimental analysis of processes determining cathode performance in solid oxide fuel cells

2013

Solid oxide fuel cells (SOFC) are under intensive investigation since the 1980's as these devices open the way for ecologically clean direct conversion of the chemical energy into electricity, avoiding the efficiency limitation by Carnot's cycle for thermochemical conversion. However, the practical development of SOFC faces a number of unresolved fundamental problems, in particular concerning the kinetics of the electrode reactions, especially oxygen reduction reaction. We review recent experimental and theoretical achievements in the current understanding of the cathode performance by exploring and comparing mostly three materials: (La,Sr)MnO3 (LSM), (La,Sr)(Co,Fe)O3 (LSCF) and (Ba,Sr)(Co,…

Radioisotopic determination of l-carnitine content in foods commonly eaten in Western countries

2004

Abstract l -Carnitine is a vitamin-like nutrient essential for energy production and lipid metabolism in many organs and tissues such as skeletal muscle and heart. Even if l -carnitine can be synthesized, most of the carnitine present in human body is provided by food. Until now, no large study has been conducted where the content in l -carnitine of various foods was analyzed. The objective of this study was to determine the level of free l -carnitine present in food commonly consumed in Western countries. A radioisotopic assay was used to estimate l -carnitine content in raw and processed foods. From this study, it clearly appeared that meat products were the best sources for l -carnitine.…

Negative pressure cavitation-microwave assisted preparation of extract of Pyrola incarnata Fisch. rich in hyperin, 2'-O-galloylhyperin and chimaphili…

2013

Abstract A novel and effective extraction method, namely negative pressure cavitation-microwave assisted extraction technique (NMAE), was developed for the preparation of extracts of Pyrola incarnata Fisch., which are rich in the main constituents hyperin, 2′-O-galloylhyperin and chimaphilin. Single factor experiments and Box–Behnken design (BBD) were combined with a response surface methodology to examine factors affecting extraction. Maximum extraction yields of hyperin, 2′-O-galloylhyperin and chimaphilin (1.339 ± 0.029, 4.831 ± 0.117 and 0.329 ± 0.011 mg/g, respectively) were achieved under the following optimised conditions: 700 W microwave power, 50 °C extraction temperature, 30:1 mL/…

Carnosine Inhibits Aβ42Aggregation by Perturbing the H-Bond Network in and around the Central Hydrophobic Cluster

2013

Aggregation of the amyloid-β peptide (Aβ) into fibrillar structures is a hallmark of Alzheimer's disease. Thus, preventing self-assembly of the Aβ peptide is an attractive therapeutic strategy. Here, we used experimental techniques and atomistic simulations to investigate the influence of carnosine, a dipeptide naturally occurring in the brain, on Aβ aggregation. Scanning force microscopy, circular dichroism and thioflavin T fluorescence experiments showed that carnosine does not modify the conformational features of Aβ42 but nonetheless inhibits amyloid growth. Molecular dynamics (MD) simulations indicated that carnosine interacts transiently with monomeric Aβ42 by salt bridges with charge…

Local minimizers and gamma-convergence for nonlocal perimeters in Carnot groups

2020

We prove the local minimality of halfspaces in Carnot groups for a class of nonlocal functionals usually addressed as nonlocal perimeters. Moreover, in a class of Carnot groups in which the De Giorgi's rectifiability Theorem holds, we provide a lower bound for the $\Gamma$-liminf of the rescaled energy in terms of the horizontal perimeter.

Nanoscale Heat Engine Beyond the Carnot Limit

2013

We consider a quantum Otto cycle for a time-dependent harmonic oscillator coupled to a squeezed thermal reservoir. We show that the efficiency at maximum power increases with the degree of squeezing, surpassing the standard Carnot limit and approaching unity exponentially for large squeezing parameters. We further propose an experimental scheme to implement such a model system by using a single trapped ion in a linear Paul trap with special geometry. Our analytical investigations are supported by Monte Carlo simulations that demonstrate the feasibility of our proposal. For realistic trap parameters, an increase of the efficiency at maximum power of up to a factor of 4 is reached, largely ex…

Carta de esclavitud al Señor S. Josef, fundada en el Real Convento de Predicadores de la Villa de Carlet : El Ilmo. ... Don Andrès Mayoral, Arzobispo…

El f. orlat Grav. xil. enmarcat de S. Josep, situat entre les paraules del tít

Convex functions on Carnot Groups

2007

We consider the definition and regularity properties of convex functions in Carnot groups. We show that various notions of convexity in the subelliptic setting that have appeared in the literature are equivalent. Our point of view is based on thinking of convex functions as subsolutions of homogeneous elliptic equations.

Creazione e decreazione. La dialettica corporale di trascendenza ed immanenza in Simone Weil

2005

Weil's reflection on the theme body and transcendence involves, on one hand the awareness of the meaning of suffering, and on the other a rethiking of God's creative act. Ii is only the body, and the body bound to souffering, place of abandonment and maximum distance from God, the place in which the Father's love in creation reveals itself to man. It is only a particular way to understand the body devoured by pain, which allows man to establish contact with Transcendence and to experience the peculiar movement of the Creator's lovefor the creature: creation as de-creation.

Lo stridore di Dio che si fa carne

2023

La questione che il volume di Giancarlo Gaeta (In attesa del Regno. Il Cristianesimo alla svolta dei tempi, Quodlibet, 2022) pone esplicitamente nella postilla finale, ma che in realtà attraversa – seppur in modi diversi – tutti i saggi in esso raccolti, è al tempo stesso provocatoria e cruciale: cosa resta oggi, a duemila anni dalla sua comparsa, del cristianesimo? Nelle pagine che seguono, proveremo a rispondere indirettamente a questa domanda, partendo da alcune brevi riflessioni che riguarderanno un’altra questione – quella riguardante la crisi del cristianesimo – che in un certo senso precede quella del “cosa resta” e che ad essa inevitabilmen te si connette. Più precisamente, cerchere…