1,699 research outputs found
The Charm of the Proton and the Production
We propose a two component model for charmed baryon production in
collisions consisting of the conventional parton fusion mechanism and
fragmentation plus quarks recombination in which a valence diquark from
the proton recombines with a -sea quark to produce a . Our
two-component model is compared with the intrinsic charm two-component model
and experimental data.Comment: 6 pages, LaTex, 2 figures included, aipproc.sty included. Talk
presented at Simposio Latino Americano de Fisica de Altas Energias, Merida,
Mexico, November 199
The Polarization and the Recombination Mechanism
We use the recombination and the Thomas Precession Model to obtain a
prediction for the polarization in the
reaction. We study the effect of the recombination function on the
polarization.Comment: 4 pages, LaTex, 1 figures included, aipproc.sty included. Talk
presented at Simposio Latino Americano de Fisica de Altas Energias, Merida,
Mexico, November 199
Solubility of salts in mixed solvents: experimental data and modeling
Phase equilibria in electrolyte systems has been receiving much attention from different research groups. Much of the experimental and theoretical work has been carried out on aqueous systems or in the study of salt effect in vapor-liquid equilibria. However, the design and simulation of unit operations such as, The recently developed extractive crystallization, requires experimental solubility data as well as The ability to correlate and predict electrolyte activity coefficients in mixed-solvents. Moreover, this kind of data can give many relevant indications about ion-solvent interactions and allows the calculation of other thermodynamic properties.
Thus, in this work, the solubilities of the salts NaBr and KBr were measured, by an analytical isothermal method, in water, methanol, ethanol and their binary mixed-solvent mixtures, water/methanol, water/ethanol and methanol/ethanol, at temperatures from ambient up to 80 O(
The obtained data, were used, together with osmotic and mean ionic molal activity coefficients data available in the literature, to test the capabilities of UNIQUAC-based models for the representation of the thermodynamics properties of these systems.
Results are shown and comparisons with other approaches are given
InteligĂȘncia emocional â Ferramenta essencial para uma vida positiva
Este artĂculo presenta el papel de la inteligencia emocional y el impacto positivo que puede tener en la vida de un ser humano. A principios de la dĂ©cada de 1990, Salovey y Mayer (1990) publicaron un artĂculo que resultarĂa de una serie de estudios sobre la inteligencia y el papel de las emociones en el desarrollo del hombre. Sugirieron asĂ, que habĂa una habilidad cognitiva que hasta ahora no habĂa sido clasificada. Esta competencia se denomina inteligencia emocional, a partir de ese momento suscita un profundo interĂ©s en muchos investigadores de todo el mundo. Goleman (1996) llama la atenciĂłn al mundo para un tema ya profundizado por varios autores, haciendo hincapiĂ© en la distinta concepciĂłn de la inteligencia tradicional. Da a conocer el Ă©xito que el papel de la inteligencia emocional y las emociones podrĂan tener en el desarrollo profesional, psicolĂłgico y social de cada individuo.
La inteligencia emocional permite al hombre tomar conciencia de sus emociones, comprender sus sentimientos, tanto como los de los demĂĄs.
Es una habilidad que poseemos para poder relacionarnos con los demĂĄs y comunicarnos de forma asertiva, que va a permitir proyectar una actitud optimista ante la vida.
Relacionado con un fuerte aliado inteligencia emocional y las emociones, pueden proporcionar niveles de bienestar psicolĂłgico y fĂsico no descubiertos hasta entonces.
Participando y aplicando una psicologĂa positiva en su vida, el hombre puede cubrir campos de estabilidad nunca antes alcanzado.
La inteligencia emocional es un arte que requiere un aprendizaje simple y consciente de un valor incalculable.This paper presents the role of Emotional Intelligence and the positive impact it can have on human life. In the early 1990s, Salovey and Mayer (1990) published an article that would result from several studies on the intelligence and the role of emotions in human development. Have suggested that there was a cognitive ability that until now had not been classified. Those powers it is known as Emotional Intelligence, from that moment raises a deep interest in many researchers around the world. Goleman (1996) draws attention to the world for a theme already in detail by other authors, the distinct conception of traditional intelligence. Making known the development that the role of emotional intelligence and their emotions could have on professional success, psychological and social development of each individual.
The Emotional Intelligence enables man to become aware of their emotions, understand the feelings, as much as their others.
Itâs a skill that we possess in order to relate to others and communicate in an assertive manner, which will allow project an optimistic attitude towards life.
Linked to a strong ally emotional intelligence and emotions, can provide levels of psychological well-being and physical not covered before.
Joining and applying a positive psychology in your life, man can cover fields of stability never before achieved.
Emotional intelligence is an art that requires a simple learning and conscious invaluable.O presente trabalho visa apresentar o papel da InteligĂȘncia Emocional e as repercussĂ”es positivas que pode ter na vida do ser Humano. No inĂcio da dĂ©cada de 1990, Salovey e Mayer (1990) publicaram um artigo que resultaria de vĂĄrios estudos sobre a inteligĂȘncia e o papel das emoçÔes no desenvolvimento do Homem. Sugeriram assim, que existia uma competĂȘncia cognitiva que atĂ© ao momento nĂŁo tinha sido classificada. Tal competĂȘncia recebe a designação de InteligĂȘncia Emocional, desde esse momento suscita um profundo interesse em vĂĄrios pesquisadores por todo o mundo.
Goleman (1996) chama a atenção ao mundo para um tema jĂĄ aprofundado por vĂĄrios autores, vincando a concepção distinta da InteligĂȘncia tradicional. Dando a conhecer o sucesso que o papel da InteligĂȘncia Emocional e EmoçÔes poderiam ter no desenvolvimento profissional, psicolĂłgico e social de cada individuo.
A InteligĂȘncia Emocional permite ao ser humano tomar consciĂȘncia das suas emoçÔes, compreender os sentimentos, tanto como as dos seus demais.
Ă a uma aptidĂŁo que possuĂmos, de forma a relacionar com os outros e comunicar de forma assertiva, que vai permitir projectar uma atitude optimista perante a vida.
A inteligĂȘncia Emocional Ă© uma arte que pressupĂ”e uma aprendizagem simples e consciente de valor incalculĂĄvel
The effect of the alcohol content on the solubility of amino acids in aqueous solutions
The solubility of me most simple a-amino acid, glycine, was measured in the temperature range between 25 and 60°C for the aqueous system of ethanol and at 25 °C for the aqueous system 0V 1-propanol. Theoretical work was essentially focused on the application of the excess solubility approach with conventional thermodynamic models such as the Margules and Wilson equations. The simple three suffix Margules model, with only one parameter to be estimated, gave the best results, with an average absolute deviation of 3.8%
Solubility of amino acids in mixed solvent systems
The solubilities of L-serine, L-threonine and L-isoleucine in the aqueous
systems of ethanol, 1-propanol and 2-propanol were measured in the
temperature range between 298.15 K and 333.15 K by means of a
gravimetric method and a spectrophotometric technique based on a
ninhydrin reaction. The solubility data from this work and from literature
were used to explore the potentialities of the application of the excess
solubility approach with the NRTL [1], modified NRTL [2], modified
UNIQUAC [3, 4] equations and the model presented by Gude et al. (1996)
[5, 6]. These four models give a global average relative deviation of 12.2 %,
12.0 %, 15.1 %, and 16.2 % for correlation and 16.3 %, 14.6 %, 27.3 %, and
22.0 % for prediction, respectively
Electrolyte effect on the solubility of amino acids in aqueous solutions
The precipitation and crystallization of biomolecules have been widely used for their separation and concentration. The presence of electrolytes in solution may affect significantly the solubilities of biochemicals, which has been used for salt-induced separation of proteins.
Although amino acids are among the simplest biochemicals, they have many similarities with more complex biochemicals and are the building block of proteins. So, the study of the electrolyte effect In the solubility of amino acids in water is a good starting point for further developments.
Although some studies have been published concerning the measurement and thermodynamic properties modeling of aqueous solutions of amino acids with electrolytes, the information available is very scarce. Therefore, in this work, the solubility of Glycine and OL-Alanine were measured in the temperature range between 25 and 60 °C for aqueous systems of KCI, Na2SO4 and (NH4)2S04, salts most often used in industrial separation processes. A comparison is given with values recently published in the literatures. It was possible to find out big discrepancies, and for the solubility of OL-Alanine in aqueous solutions an inverse dependence with the concentration of the KCI salt was obtained,
The new experimental data were used together with information already available concerning the activity coefficients and solubilities, to explore the capabilities of a modified Wilson model, recently developed in our group, for the thermodynamic description of these complex systems. Despite the difficulties that arose for the description of these highly non-ideal systems, the results shown are satisfactory for the correlation of the solubilities
- âŠ