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Exact Solutions of a Chaplygin Gas in an Anisotropic Space-Time of Petrov D
(2017)
This document obtains two exact solutions to the anisotropic spacetime of Petrov D by using the model of a perfect fluid. These solutions represent a scenario of a universe in which the pressure P and the energetic density ...
Semigrupos dinámicos y las ecuaciones de Bloch en sistemas abiertos finitos
(1981-07)
En la Mecánica Estadística sin equilibrio, se suele derivar las ecuaciones de transporte de un sistema abierto del requisito que tal sistema forma parte de un gran sistema dinámico conservativo cerca del equilibrio. Las ...
Crystal structure of (E)-2-(tert-butylamino)-4-(tertbutylimino)naphthalen-1(4H)-one
(2018)
The title compound, C18H24N2O, is the first example of a naphthoquinone imine derivative isolated in the 4-imine/2-amine tautomeric form having bulky alkyl substituents at the N atoms. The molecular conformation is stabilized ...
Drinking as an epidemic - a simple mathematical model with recovery and relapse
(2007)
This chapter discusses a simple mathematical model of drinking lapse. Problem drinking is modeled as an acquired state - the result of frequent or intense interactions among individuals in three drinking states within a ...
Critical Assessment of pH-Dependent Lipophilicity Profiles of Small Molecules: Which One Should We Use and In Which Cases?
(2023-10-03)
Lipophilicity is a physicochemical property with wide relevance in drug design, computational biology, food, environmental and medicinal chemistry. Lipophilicity is commonly expressed as the partition coefficient for neutral ...
Indirect inference for locally stationary ARMA processes with stable innovations
(2020)
The class of locally stationary processes assumes that there is a time-varying spectral representation, that is, the existence of finite second moment. We propose the α-stable locally stationary process by modifying the ...
Sums over paths adapted to quantum theory in phase space
(1986)
The concept of phase space plays a decisive role in the study of the transition from classical to quantum physics. This is particularly the case in areas such as nonlinear dynamics and chaos, geometric quantization and the ...
Actores, intereses y percepciones de la comunidad político-científica en torno a la formulación del problema de las políticas de Ciencia, Tecnología e Innovación en Costa Rica en la primera década del siglo XXI
(2010)
En Costa Rica, hasta los inicios del siglo XXI se creó la primera "Comisión Especial", en la asamblea Legislativa, para tratar el tema del desarrollo de la Ciencia, la tecnología y la innovación en el año 2006. (En adelante ...
Residuos, degradación y comportamiento de la ametrina en un vertisol de Guanacaste. Costa Rica
(1978)
Residues of the herbicide Ametrine (2-ethylamine-4-isopropylamine-6-methylthio-s-atrazine) were determined by UV-spectrometrical analysis in a soil (vertisol) of Guanacaste, Costa Rica, which has been treated with this ...
Significado tectónico de los sistemas de fallas Jaris y Candelaria en el Antearco de Costa Rica
(2024)
In this research, we study the Jaris and Candelaria faults, in the fore-arc of Costa Rica, based on photointerpretation, field work, and the relocation of earthquakes recorded by the National Seismological
Network of Costa ...