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Search Results: 1 - 10 of 8931 matches for " Gustavo; "
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Variation of Total Ozone during 24 August 2005 Magnetic Storm: A Case Study  [PDF]
Gustavo A. Mansilla
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.34049

This paper presents the longitudinal distribution of total ozone along several latitudinal circles from both hemispheres during a strong geomagnetic storm that occurred on 24 August 2005 after a solar proton event (the maximum flux of protons with energy > 10 MeV was 1.70 × 107 protons cm-2.day-1.sr-1 on 23 August). For that, we use average daily values of total ozone observations (=column ozone amount) in Dobson units for the period 18-25 August 2005 (obtained from the Total Ozone Mapping Spectrometer, TOMS). The considered storm occurred after a relatively quiet geomagnetic period and it is not superposed by another perturbation, which permit us to identify clearly the effects of the geomagnetic storm on total ozone. The results show statistically significant decreases in ozone along the latitudinal circles 70°N and 70°S (summer and winter), no statistically significant effects at middle latitudes (40°S) and sparse statistically significant increases at low latitudes (20°S). The role of some mechanisms to explain the features observed is considered.

Educational Technology and Teacher Education: Barriers and Gates in South America  [PDF]
Gustavo Daniel Constantino
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.512122

Historically, Educational Technology (EdTech) and Teacher Education (TE) have shared a conflicted relationship, particularly where practicing teachers have not been trained in ET in a manner so that they are able to coherently and efficiently incorporate the new educational technology into their classrooms and schools. In Latin America’s diverse scenario, our analysis is focused on a scenario consisting of Argentina and Uruguay. In this scenario, we identify the social and cultural context where teacher education and teaching practice take place, the EdTech-related programs with the greatest impact, and the “barriers” hindering access to and the application of EdTech, as well as the “bridges” or “gates” that facilitate their effective incorporation to teaching and learning both at schools and in teacher education. Lastly, we propose some courses of action to reduce these barriers and widen the gates connecting EdTech and school settings.

Some Deviations of Form: A Little Essay on Psychoanalysis, Art and Aesthetics  [PDF]
Gustavo Henrique Dionisio
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.519196
Abstract: This work intends to investigate the use of psychoanalytical theory within the aesthetic and critical contemporary art field. To this purpose, it focuses on two philosophers who have become significant in our time: the art critic Hal Foster and the art historian Georges Didi-Huberman. This study aims to show how far the concepts generated in psychoanalytic praxis allowed interpretations that disrupt the traditional aesthetics field. This type of analysis is possible once we abandon the paradigm of “applied psychoanalysis”, which is still current in non-clinical setting. Finally, the proposal wants to argue that the category of the amorphous may clarify certain aesthetic experiences that range from the modernity of art through postmodernity.
Beyond Gangsta: Hip-Hop, Skate Culture and Web Culture in the Music of Tyler, the Creator  [PDF]
Gustavo Souza Marques
Art and Design Review (ADR) , 2015, DOI: 10.4236/adr.2015.31002
Abstract: This article came from the homonymous PhD proposal submitted and accepted by Music School of University College Cork (UCC, Ireland) to be started in September 2015 under the guidance of Dr. J. Griffith Rollefson. It aims to point out and discuss the articulations made by rapper, producer, actor and video director Tyler Okonma, known by the stage name Tyler, the Creator, to shift, but also maintain, some frames of gangsta rap discourse. Noticed by his rape fantasies lyrics and ultraviolent shouts, most present in his two first albums, Tyler has been acclaimed for his notable musical talent but criticized for its misogynist themes. Despite this outrageous aspect of its music, his confessional and often self-depreciating lyrics have been a novelty for constant self-pride and powerful hip-hop lyrics. Moreover, it works as a compensation for his aggressiveness since it could be seen as a demonstration of fragility rather than sexual domination. The way he uses hip-hop mentality, skate culture nihilism and Web 2.0 platforms to promote his art has made him one of the most prominent hip-hop artists from 21st century. Based on related authors on hip-hop topics like gangsta, misogyny, media and racial stereotypes this article discuss the ways in which Tyler, the Creator reflects but also denies the most known and commented frames of rap music.
Generalization of the Force Approach to Radiation Reaction  [PDF]
Gustavo V. López
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.53048
Abstract: A new approach to radiation reaction for the correction of the linear and circular motion of a charged particle takes into account the emission of electromagnetic radiation due to its acceleration. This new formulation was based on expressing the radiation reaction force in terms of the external force rather than the acceleration of the charge. In this paper, a generalization of the radiation reaction force in terms of the external force approach is formulated for any arbitrary motion of the charged particle. This generalization includes the linear and circular acceleration cases previously investigated.
On Maxwell Equations for Gravitational Field  [PDF]
Gustavo V. López
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.64080
Abstract: For explicitly time depending mass density which satisfies a continuity equation, it is shown that Maxwell-like equations for gravitational field follow naturally without any need of General Relativity Theory approximation or related assumptions. As a consequence, it is shown that several features already known in Electrodynamics (Poynting vector, density of energy, tensor stress, and radiation) are totally reproduced for gravitational field.
Study of Decoherence of Entangled States Made up of Two Basic States in a Linear Chain of Three Qubits  [PDF]
Gustavo López Velázquez, Gustavo Montes Cabrera
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.611172
Abstract: Using Lindblad approach to study decoherence of quantum systems, we study the decoherence and decay of entangled states, formed by two basic states of a chain of thee qubits. We look on these states for a possible regular dependence on their decay as a function of their energy separation between the basic states under different types of environments. We didn’t find regular or significant dependence on this energy separation for the type of environment considered.
On the Relationship between the Pure Delay and the Natural Period of Oscillation  [PDF]
Daniel Chuk, Gustavo Rodriguez Medina
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.76046
Abstract: This paper provides a proof of the well-known relationship between the pure delay and the natural period of oscillation in industrial systems.
Solid-phase molecular recognition of cytosine based on proton-transfer reaction. Part II. supramolecular architecture in the cocrystals of cytosine and its 5-Fluoroderivative with 5-Nitrouracil
Gustavo Portalone
Chemistry Central Journal , 2011, DOI: 10.1186/1752-153x-5-51
Abstract: Reaction of cytosine (Cyt) and 5-fluorocytosine (5Fcyt) with 5-nitrouracil (Nit) in aqueous solution yielded two new products, which have been characterized by single-crystal X-ray diffraction. The products include a dihydrated molecular salt (CytNit) having both ionic and neutral hydrogen-bonded species, and a dihydrated cocrystal of neutral species (5FcytNit). In CytNit a protonated and an unprotonated cytosine form a triply hydrogen-bonded aggregate in a self-recognition ion-pair complex, and this dimer is then hydrogen bonded to one neutral and one anionic 5-nitrouracil molecule. In 5FcytNit the two neutral nucleobase derivatives are hydrogen bonded in pairs. In both structures conventional N-H...O, O-H...O, N-H+...N and N-H...N- intermolecular interactions are most significant in the structural assembly.The supramolecular structure of the molecular adducts formed by cytosine and 5-fluorocytosine with 5-nitrouracil, CytNit and 5FcytNit, respectively, have been investigated in detail. CytNit and 5FcytNit exhibit widely differing hydrogen-bonding patterns, though both possess layered structures. The crystal structures of CytNit (Dpka = -0.7, molecular salt) and 5FcytNit (Dpka = -2.0, cocrystal) confirm that, at the present level of knowledge about the nature of proton-transfer process, there is not a strict correlation between the Dpka values and the proton transfer, in that the acid/base pka strength is not a definite guide to predict the location of H atoms in the solid state. Eventually, the absence in 5FcytNit of hydrogen bonds involving fluorine is in agreement with findings that covalently bound fluorine hardly ever acts as acceptor for available Br?nsted acidic sites in the presence of competing heteroatom acceptors.Our more recent knowledge of both the detail and the variety of DNA structures themselves, and the manner in which they are recognized by regulatory proteins, mutational compounds and drugs, is starting to pave the way to more profound levels of
Los cardos y las tareas rurales en la provincia de Buenos Aires durante el siglo XIX
Mundo agrario , 2004,
Abstract: in this paper, we focuses on the thistles and their influence on the rural works during the twentieth century, from the following items: the thistles' localization on the buenos aires province; their way of multiplication; which is the connection between the thistles and the men and animals; the thistles' influence on the management of colonial estancia. contrary to the historiography, we consider that the thistles didn't determinate the rural works, but this was related with the scarcity of workers.
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