Partial Classification of Lorenz Knots: Syllable Permutations of Torus Knots Words

We define families of aperiodic words associated to Lorenz knots that arise naturally as syllable permutations of symbolic words corresponding to torus knots. An algorithm to construct symbolic words of satellite Lorenz knots is defined. We prove, subject to the validity of a previous conjecture, that Lorenz knots coded by some of these families of words are hyperbolic, by showing that they are neither satellites nor torus knots and making use of Thurston's theorem. Infinite families of hyperbolic Lorenz knots are generated in this way, to our knowledge, for the first time. The techniques used can be generalized to study other families of Lorenz knots

The down operator and expansions of near rectangular k-Schur functions

We prove that the Lam-Shimozono "down operator" on the affine Weyl group induces a derivation of the affine Fomin-Stanley subalgebra of the affine nilCoxeter algebra. We use this to verify a conjecture of Berg, Bergeron, Pon and Zabrocki describing the expansion of k-Schur functions of "near rectangles" in the affine nilCoxeter algebra. Consequently, we obtain a combinatorial interpretation of the corresponding k-Littlewood--Richardson coefficients

Web Acceptance and Usage Model: A Comparison between Goal-directed and Experiential Web Users

In this paper we analyse the Web acceptance and usage between goal-directed users and experiential users, incorporating intrinsic motives to improve the particular and explanatory TAM value –traditionally related to extrinsic motives-. A field study was conducted to validate measures used to operationalize model variables and to test the hypothesised network of relationships. The data analysis method used was Partial Least Squares (PLS).The empirical results provided strong support for the hypotheses, highlighting the roles of flow, ease of use and usefulness in determining the actual use of the Web among experiential and goal-directed users. In contrast with previous research that suggests that flow would be more likely to occur during experiential activities than goal-directed activities, we found clear evidence of flow for goal-directed activities. In particular the study findings indicate that flow might play a powerfulrole in determining the attitude towards usage,intention to useand, in turn,actual Web use among experiential and goal-directed users

Refrigeration Capacity and Effect of Ageing on the Operation of Cellulose Evaporative Cooling Pads, by Wind Tunnel Analysis

This study investigates the temperature reduction capacity and water consumption of a fan-pad system installed in a greenhouse located in the coastal regions of Almería. The suitability of this system for coastal zones with high environmental humidity during the summer is analyzed. Historical temperature and relative humidity series are studied, obtaining the thermal difference and maximum, medium, and minimum monthly water consumption of the pads based on the operation data of the pads. Despite the high relative humidity of the air in the hottest hours of the day, a decrease of 5.92 ºC in the mean temperature and a water consumption of 13.55 l/h per square meter of an evaporative cooling pad are obtained in the month of August. Additionally, the operation of a cellulose evaporative cooling pad installed for 3 years in a greenhouse is analyzed in a wind tunnel and compared with that of a new pad of the same model. Over time and with low maintenance, the porosity of the pad decreases due to salt incrustation. The salt incrustation makes airflow more difficult in the pad, increasing the pressure drop by 170.04%; however, the air saturation efficiency of the pad increases by 6.6% due to the greater contact time between the air and the waterMinisterio de Economía y Competitividad de España AGL2015-68050-RUnión Europea (FEDER) AGL2015-68050-

Enzimas: qué son y para qué sirven

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Untitled. Deleuze 68. Materials: History of Repetition

En Sin título. Deleuze 68 quisiéramos ofrecer el marco de la cuestión: ¿es posible repetir la revolución? Esta pregunta conlleva, como todo cuadro (post)moderno, una res-puesta indirecta, necesariamente, mediada. Para ello contamos con los materiales “historia sobre repetición” con los que se pretende aquilatar el papel de la repetición pura como “motor inmóvil” de la historia. De ahí la preposición «sobre» en lugar de la recurrida con-junción «y» o de la archipresente preposición «de», ya que, en lugar de equiparar ambos términos o de asociarlos directamente, la preposición habría de disponer el espacio para dar respuesta a tan incómodo interrogante. Seguiremos esta cuestión planteada por Deleu-ze y Guattari en El Anti-Edipo como problema de fondo a partir de la lectura de Marx y, principalmente, a partir de la idea de que la historia, la historia universal, es siempre la historia universal de lo contingente.In Untitled. Deleuze 68 we would like to offer the framework of the question: Is it possible to repeat the revolution? This question entails, like every modern (post) picture, an indirect, necessarily, mediated response. For this we have the materials “history about repetition” with which it is intended to assess the role of pure repetition as “motionless motor” of history. Hence the preposition “about” instead of the recurrent conjunction “and” or the preposterous preposition “of”, since, instead of equating both terms or asso-ciating them directly, the preposition would have to provide the space to respond to such an awkward question. We will follow this question posed by Deleuze and Guattari in The Anti-Oedipus as a fundamental problem from the reading of Marx and, mainly, from the idea that history, universal history, is always the universal history of the contingent