Search results for "CONSTANT"
showing 10 items of 1718 documents
Thermodynamic Study For The Protonation Of Halloysite
2016
The Halloysite (Al2Si2O5(OH)4·2H2O) is an abundant and cheap clay and is considered one of the most promising nano structured and naturally occurring clay mineral. Large deposits of this material are present in France, Belgium, China, New Zealand and USA [1,2]. Among the spheroidal, tubular or platy morphologies, the tubular is the most common and abundant one. Typically, halloysite nanotubes (HNTs) are formed by 15 – 20 aluminosilicate layers, having a length of 1 ± 0.5 μm, and inner and outer diameters of 10 – 15 nm and 50 -70 nm, respectively [1]. In each layer, the SiOH and the AlOH groups are disposed on the external and the internal surfaces, respectively. As consequence, in each nano…
The Twelfth-century Manuscript of Constantine the African's Theorica Pantegni at the National Library of Finland
2022
Calculation of magnetic coupling constants with hybrid density functionals
2013
The currently available computational methods for the calculation of magnetic coupling constants with density functional theory have been reviewed. These methods include modern approximations to the exchangecorrelation functional, such as hybrid, range-separated and double-hybrid functionals, as well as approaches to treat the severe spin symmetry problems encountered in density functional calculations of magnetic interactions. In addition to the commonly used unrestricted Kohn–Sham formalism, density functional methods based on multireference wave functions and ensemble densities are also discussed. Performance of these models based on various studies has been summarized. The results indic…
Minimal learning machine in anomaly detection from hyperspectral images
2020
Abstract. Anomaly detection from hyperspectral data needs computationally efficient methods to process the data when the data gathering platform is a drone or a cube satellite. In this study, we introduce a minimal learning machine for hyperspectral anomaly detection. Minimal learning machine is a novel distance-based classification algorithm, which is now modified to detect anomalies. Besides being computationally efficient, minimal learning machine is also easy to implement. Based on the results, we show that minimal learning machine is efficient in detecting global anomalies from the hyperspectral data with low false alarm rate.
Propuesta de un test para determinar el conocimiento conceptual de estudiantes universitarios sobre la constante de equilibrio químico y su aplicació…
2014
This article outlines a procedure that was used to develop a written test for evaluating the conceptual knowledge of chemical equilibrium constant among university students. The concepts in the subject matter were carefully defined through propositional statements. Students" understanding of the topic was determined through interviews. These data were used to produce nine multiple choice questions. Each question was designed to identify misconceptions related to the chemical equilibrium constant. The test was evaluated by foure associate professors and was administred to a total of 196 spanish university students. This test has a Cronbach"s alpha reliability of 0.63 and its content validity…
Teodor Llorente i la llengua dels valencians
2010
A partir de la dècada dels anys 60 del segle XIX, els escriptors catalans començaren a bandejar les velles denominacions de «llemosí» i «llengua llemosina», aplicades a la llengua comuna, en favor de «català» i «llengua catalana». Tanmateix, els escriptors valencians, amb Teodor Llorente al capdavant, es resistiren a abandonar la denominació històrica, ja que a València l’apel·latiu «català» no gaudia de tradició terminològica, i a més creava rebuig social. En aquest sentit, l’estudi repassa la manera com, en un primer moment, Llorente no volgué renunciar a un nom secular que, tot i saber etimològicament erroni, considerava socialment més apropiat; fins que, amb el pas dels anys, i influït …
Actituds lingüístiques dels lexicògrafs valencians del segle XIX
1991
Linguistic attitudes shown by the Valencian lexicographers during the 19th century do vary considerably and range from Sanelo and Llombart's very positive views in favour of a standard norm, to the rather uncommitted and more neutral position of Escrig, or the very negative outlook represented by Cabrera.
La pàtria somniada dels poetes de la renaixença valenciana
2011
Anàlisi de vuit poemaris dels principals autors de la Renaixença valenciana, a fi de comprovar quina imatge oferiren del País Valencià. Una visió que està unida a la descripció del paisatge, entès aquest com aquell que pot oferir una descripció més tangible del país. Aquesta visió fou duta a terme des d’una perspectiva sentimental i econòmica, fonamentalment, i amb una clara voluntat ideològica; es concretava en la bellesa i riquesa de tres indrets geogràfics ben delimitats i sovint complementaris: el mar, l’àrea de regadiu i la muntanya. Una imatge fonamentalment idíl·lica, somniada i que, encara que elaborada a partir d’una base real, amb el pas del temps acabaria com a lloc comú, continu…
Structural characterization and optical constants of p-toluene sulfonic acid doped polyaniline and its composites of chitosan and reduced graphene-ox…
2020
Para-Toluene sulfonic acid doped polyaniline (PANI), PANI/chitosan composites, PANI/reduced graphene-oxide composites and a ternary composite comprising of PANI, chitosan and reduced graphene-oxide have synthesised via oxidative polymerisation of aniline by Ammonium peroxydisulfate (APS). FTIR, XRD, FESEM and UV-VIS techniques were performed for the confirmation of the successful synthesis. The fundamental optical parameters such as, complex refractive index, complex dielectric constants and optical conductivity of the PANI and the composites were investigated in the UV-VIS-NIR range. The results show a clear dependence on the constituent component such as sulphur as well as the absorbance …