A Comprehensive Study of Coke Deposits on a Pt-Sn/SBA-16 Catalyst during the Dehydrogenation of Propane

Catalytic propane dehydrogenation is an attractive method to produce propylene while avoiding the issues of its traditional synthesis via naphtha steam cracking of naphtha. In this contribution, a series of Pt-Sn/SBA-16 catalysts were synthesized and evaluated for this purpose. Bimetallic Pt-Sn catalysts were more active than catalysts containing only Pt. The catalyst with the best performance was assessed at different reaction times of 0, 60, 180, and 300 min. The evolution of coke deposits was also studied. Thermogravimetric analysis demonstrated the presence of two types of coke on the catalyst surface at low and high temperature, respectively. Raman results showed an increased coke’s crystal size from 60 to 180 min on stream, and from 180 to 300 min under reaction, Raman suggested a reduction in the crystal size of coke. Also transmission electron microscopy confirmed a more evident agglomeration of metallic particles with reaction times higher than 180 min. These results are consistent with the phenomena called “coke migration” and the cause is often explained by coke movement near the particle to the support; it can also be explained due to sintering of the metallic particle, which we propose as a more suitable explanation.

Awful noises: evaluativism and the affective phenomenology of unpleasant auditory experience

According to the evaluativist theory of bodily pain, the overall phenomenology of a painful experience is explained by attributing to it two types of representational content—an indicative content that represents bodily damage or disturbance, and an evaluative content that represents that condition as bad for the subject. This paper considers whether evaluativism can offer a suitable explanation of aversive auditory phenomenology—the experience of awful noises—and argues that it can only do so by conceding that auditory evaluative content would be guilty of widespread error. Defending such an error-theory, moreover, comes with several explanatory costs.

Scale Symmetry in the Universe

Scale symmetry is a fundamental symmetry of physics that seems however not to be fully realized in the universe. Here, we focus on the astronomical scales ruled by gravity, where scale symmetry holds and gives rise to a truly scale invariant distribution of matter, namely it gives rise to a fractal geometry. A suitable explanation of the features of the fractal cosmic mass distribution is provided by the nonlinear Poisson–Boltzmann–Emden equation. An alternative interpretation of this equation is connected with theories of quantum gravity. We study the fractal solutions of the equation and connect them with the statistical theory of random multiplicative cascades, which originated in the theory of fluid turbulence. The type of multifractal mass distributions so obtained agrees with results from the analysis of cosmological simulations and of observations of the galaxy distribution.

Musical works’ repeatability, audibility and variability: A dispositional account

This paper is devoted to face recent views in the ontology of music that reject that musical works are repeatable in musical performances. It will be observed that musical works? repeatability implies that they are audible and variable in their performances. To this extent, the aim here is to show that repeatability, audibility and variability are ontologically substantive features of musical works? nature. The thesis that will be defended is that repeatability, audibility and variability are dispositional non-aesthetic properties of musical works. The plausibility of the dispositional account of musical works? repeatability, audibility and variability will lead us to the conclusion that they are ontologically substantive features of musical works? nature, and consequently, any suitable explanation of the ontology of musical works must not ignore them.

Fuzzy p-Absolutely Summable Difference Sequences

In this work, we introduce the notion of [Formula: see text]-absolutely summability of difference sequences of fuzzy numbers and then reduce the concept of [Formula: see text]-absolutely summable sequences of fuzzy numbers. We discuss the sets of such sequences of fuzzy numbers under different fuzzy metrics. We also establish the completeness under suitable metric. Examples along with suitable explanation are incorporated to make the theory of this paper interesting and useful. Finally, the concepts of fuzzy solidity and fuzzy symmetricity are defined and the classes for these two properties are examined as well.

Asymmetric Caregiving by Grandparents, Aunts, and Uncles and the Theories of Kin Selection and Paternity Certainty: How Does Evolution Explain Human Behavior Toward Close Relatives?

Evolutionary theories explain altruism between related individuals, not only for nonhuman animals but also humans themselves. In sociobiology and evolutionary psychology, the supposedly universally found stronger matrilineal kin caregiving by grandparents, aunts, and uncles is often explained by paternity uncertainty in the male descent line. The present article provides an overview of theories and results of the evolutionary research. I will focus, in particular, on the universal caregiving pattern as well as on cultural variety in kin caregiving, the role of actual paternity certainty in the society, theoretical inconsistencies, and nonconsanguineous step relationships. From the analysis of the empirical data, I will conclude that the paternity certainty hypothesis is in fact not a very suitable explanation for the asymmetric kin caregiving found in humans. I will discuss how human behavior toward relatives, in particular grandchildren, can be alternatively explained from an evolutionary perspective.

Register, genre and referential ambiguity of personal pronouns

This paper argues for revisiting the traditional adscription of ambiguous readings of personal pronouns, such as hearer-dominant we or generic you, pluralis maiestatis and pluralis modestiae to specific genres and/or registers. Indeed, in many languages these phenomena are considered typical for a certain genre, register or discourse context. In this paper, I will argue, on the basis of quantitative data and a qualitative analysis of examples taken from different genres (including purposefully creative language use in fiction), that a more accurate account may be formulated in terms of (inter)subjective effect, viz. the attention to the (inter)locutor (among others Benveniste 1966), as a more suitable explanation for the variation of these phenomena attested in corpora.The hearer-oriented uses of we, for instance, are considered typical for relationships characterized by power asymmetries such as teacher-student, doctor-patient (Haverkate 1984: 87; Brown & Levinson 1987), whereas generic and speaker-referring you have been considered a feature of (informal) oral language than written discourse (Hidalgo Navarro 1996). Recent corpus-based analyses including quantitative and qualitative analyses, however, call for a more nuanced view (De Cock 2011 on Spanish and English; Tarenskeen 2010 on Dutch). We may, for example, find hearer-oriented or even hearer-dominant 1st person plural forms (Have we taken our medicine?) in contexts where no power- relationship can be defined, e.g. among couples.It will be shown that these uses have different intersubjective effects, however. Their distribution is in line with overall differences as to intersubjectivity according to register and genre, beyond referential ambiguity. The concept of (inter)subjectivity then allows for a more comprehensive analysis of these phenomena and their occurrence in specific registers and genres, addressing the way in which the (inter)locutor is taken into account in each genre.

Is rewritten Bible/Scripture the solution to the Synoptic Problem?

New Testament scholars have for centuries posited different solutions to the Synoptic Problem. Recently a new solution was proposed. Mogens Müller applies Geza Vermes’s term rewritten Bible to the canonical gospels. Accepting Markan priority, he views Matthew as rewritten Mark, Luke as rewritten Matthew, and John as additional source. This article examines Müller’s hypothesis by first investigating the history of the controversial term rewritten Bible/Scripture and its recent application to the New Testament Gospels. Müller’s hypothesis is then compared to other solutions to the Synoptic Problem, such as the Augustine, Griesbach, and Farrer-Goulder Hypotheses. The Two Document Hypothesis is discussed and Müller’s 2nd century Luke theory is compared to Burton Mack’s almost similar stance and tested with the argument of synoptic intertextuality in view of the possible but improbable early second century date for Matthew. Lastly, the relationship between the synoptic Gospels is viewed in terms of literary intertextuality. Müller suggests proclamation as motivation for the Gospels’ deliberate intertextual character. This notion is combined with the concept of intertextuality to suggest a more suitable explanation for the relationship between die Gospels, namely intertextual kerugma. This broad concept includes any form of intertextuality in terms of text and context regarding the author and readers. It suitably replaces rewritten Bible, both in reference to genre and textual (exegetical) strategy.

Allometric growth of a common Nassariidae (Gastropoda) in south-east Brazil

The allometric growth of two groups of Nassarius vibex on beds of the bivalve Mytella charruana on the northern coast of the State of São Paulo, was evaluated between September 2006 and February 2007 in the bed on Camaroeiro Beach, and from March 2007 to June 2007 at Cidade Beach. The shells from Camaroeiro were longer and wider and had a smaller shell aperture than those from Cidade; a principal components analysis also confirmed different morphometric patterns between the areas. The allometric growth of the two groups showed great variation in the development of individuals. The increase of shell width and height in relation to shell length did not differ between the two areas. Shell aperture showed a contrasting growth pattern, with individuals from Camaroeiro having smaller apertures. The methodology based on Kullback–Leibler information theory and the multi-model inference showed, for N. vibex, that the classic linear allometric growth was not the most suitable explanation for the observed morphometric relationships. The patterns of relative growth observed in the two groups of N. vibex may be a consequence of different growth and variation rates, which modifies the development of the individuals. Other factors such as food resource availability and environmental parameters, which might also differ between the two areas, should also be considered.