Toward an ecological aesthetics: music as emergence

In this article we intend to suggest some ecological based principles to support the possibility of develop an ecological aesthetics. We consider that an ecological aesthetics is founded in concepts as “direct perception”, “acquisition of affordances and invariants”, “embodied embedded perception” and so on. Here we will purpose that can be possible explain especially soundscape music perception in terms of direct perception, working with perception of first hand (in a Gibsonian sense). We will present notions as embedded sound, detection of sonic affordances and invariants, and at the end we purpose an experience with perception/action paradigm to make soundscape music as emergence of a self-organized system

Surface composition of AgPd single-atom alloy catalyst in an oxidative environment

Single-atom alloys (SAAs) have recently gained considerable attention in the field of heterogeneous catalysis research due to their potential for novel catalytic properties. While SAAs are often examined in reactions of reductive atmospheres, such as hydrogenation reactions, in the present work, we change the focus to AgPd SAAs in oxidative environments since Pd has the highest catalytic activity of all metals for oxidative reactions. Here, we examine how the chemical reactivity of AgPd SAAs differs from its constituent Pd in an oxidative atmosphere. For this purpose, electronic structure changes in an Ag0.98Pd0.02 SAA foil in 1 mbar of O2 were studied by in situ x-ray photoemission spectroscopy and compared with the electronic structure of a Pd foil under the same conditions. When heated in an oxidative atmosphere, Pd in Ag0.98Pd0.02 partly oxidizes and forms a metastable PdOx surface oxide. By using a peak area modeling procedure, we conclude that PdOx on Ag0.98Pd0.02 is present as thin, possibly monolayer thick, PdOx islands on the surface. In comparison to the PdO formed on the Pd foil, the PdOx formed on AgPd is substantially less thermodynamically stable, decomposing at temperatures about 270 °C lower than the native oxide on Pd. Such behavior is an interesting property of oxides formed on dilute alloys, which could be potentially utilized in catalytic oxidative reactions such as methane oxidation

Hom-Lie color algebra structures

This paper introduces the notion of Hom-Lie color algebra, which is a natural general- ization of Hom-Lie (super)algebras. Hom-Lie color algebras include also as special cases Lie (super) algebras and Lie color algebras. We study the homomorphism relation of Hom-Lie color algebras, and construct new algebras of such kind by a \sigma-twist. Hom-Lie color admissible algebras are also defined and investigated. They are finally classified via G-Hom-associative color algebras, where G is a subgroup of the symmetric group S_3.Comment: 16 page

Capacity Gaps in Post Disaster Waste Management: Case Study in Sri Lanka

Disaster waste is one of the major consequences aftermath of any disaster, impacts on public and environment, rescue and emergency services, provision of lifeline support and socio-economic recovery of affected areas. Thus, management of wastes created by disasters has become an increasingly important issue to be addressed in responding to a disaster. This chapter intends to present the prevailing gaps in disaster waste management and approaches to minimize the impacts on disaster management at developing countries with special emphasis to Sri Lankan context. Findings revealed that, unavailability of single point responsibility and provisions for disaster waste in existing policies and capacity constraints of the prevailing peace time solid waste management practices as major capacity gaps. Establishment of a regulatory body and enforceable rules and regulations with necessary levels of capacities were identified with seven areas for capacity building for post disaster waste management. The research enabled to attain sustainable post disaster waste management for future resilience

Isolated Pd atoms in a silver matrix: Spectroscopic and chemical properties

Over the past decade, single-atom alloys (SAAs) have been a lively topic of research due to their potential for achieving novel catalytic properties and circumventing some known limitations of heterogeneous catalysts, such as scaling relationships. In researching SAAs, it is important to recognize experimental evidence of peculiarities in their electronic structure. When an isolated atom is embedded in a matrix of foreign atoms, it exhibits spectroscopic signatures that reflect its surrounding chemical environment. In the present work, using photoemission spectroscopy and computational chemistry, we discuss the experimental evidence from Ag0.98Pd0.02 SAAs that show free-atom-like characteristics in their electronic structure. In particular, the broad Pd4d valence band states of the bulk Pd metal become a narrow band in the alloy. The measured photoemission spectra were compared with the calculated photoemission signal of a free Pd atom in the gas phase with very good agreement, suggesting that the Pd4d states in the alloy exhibit very weak hybridization with their surroundings and are therefore electronically isolated. Since AgPd alloys are known for their superior performance in the industrially relevant semi-hydrogenation of acetylene, we considered whether it is worthwhile to drive the dilution of Pd in the inert Ag host to the single-atom level. We conclude that although site-isolation provides beneficial electronic structure changes to the Pd centers due to the difficulty in activating H2 on Ag, utilizing such SAAs in acetylene semi-hydrogenation would require either a higher Pd concentration to bring isolated sites sufficiently close together or an H2-activating support

Charakterisierung hybrider Komposit-Metall-Strukturen: Ermittlung einer Prüfmethode

Politische Anforderungen an striktere Abgasemissionen und der Elektrifizierungswille im Mobilitätssektor treiben das Bestreben nach Leichtbaustrukturen weiter an. Eine Möglichkeit, Leichtbau zu betreiben, ist das Anbringen von sogenannten Patches aus faserverstärktem Kunststoff (FVK) zur lokalen Verstärkung des Metalls. Dabei wird ein FVK-Tape aus thermoplastischer Matrix und kontinuierlichen, unidirektionalen Fasern mit entsprechender Faserorientierung durch das wärmeunterstützte Pressfügen mit dem Metall vereint. Potenzielle Einsatzgebiete derartiger Hybridstrukturen sind die B-Säule als Strukturelement oder Beplankungselemente (Motorhaube etc.) als semi-strukturelle Bauteile, für welche die Biegung auslegungskritisch ist. Allerdings existieren keine genormten Prüfmethoden für die neu geschaffene Material-klasse, womit sich die Vergleichbarkeit verschiedener Materialien und die Vorausle-gung schwierig gestaltet. Ferner liegen keine charakteristischen Kennwerte vor, die den hybriden Verbund beschreiben. Das Anwenden von bekannten Prüfmethoden zur Kenn-wertermittlung ist aufgrund der Anisotropie und der Asymmetrie des Probenaufbaus möglich, schränkt aber die Interpretation der Ergebnisse ein. Um das Verständnis der hybriden Strukturen zu erweitern und einen ersten Schritt in Richtung eines standardi-sierten Prüfprozesses zu veranlassen, wird die Dreipunkt-Biegeprüfung als Referenz-versuch herangezogen. Zunächst werden sowohl unterschiedliche Probendicken als auch verschiedene Probenpositionen untersucht und deren Auswirkungen auf die Bie-gesteifigkeit und -festigkeit beurteilt

Improving work placement for international students, their supervisors and other stakeholders: final report 2016

Report from the WISP project which endeavoured to improve work placement components of study programs for international students in Australia. In particular the researchers: identified current procedures and practices in relation to work-placement and associated assessment for international students in the discipline areas of Business, Education, Engineering, and Health in participating institutions; identified and explored challenges, concerns and successes for international students, their mentors (i.e. those people who are responsible for assessing and working with students during their placement) and coordinators (i.e. those people responsible for the coordination of placements, at both universities and workplaces) prior to, during and after the students leave; and developed and applied a working model of effective practice around internationalisation, work-place socialisation and reflection. The model provided a theoretical and evidence-based foundation in the development of support materials for current and prospective international students, their supervisors, coordinators and relevant university staff. Six universities participated in the project

Ordered phase in the two-dimensional randomly coupled ferromagnet

True ground states are evaluated for a 2d Ising model with random near neighbor interactions and ferromagnetic second neighbor interactions (the Randomly Coupled Ferromagnet). The spin glass stiffness exponent is positive when the absolute value of the random interaction is weaker than the ferromagnetic interaction. This result demonstrates that in this parameter domain the spin glass like ordering temperature is non-zero for these systems, in strong contrast to the 2d Edwards-Anderson spin glass.Comment: 7 pages; 9 figures; revtex; new version much extende

Anisotropic physical properties of single crystal U2Rh2Sn in high magnetic fields

We report on the crystal and magnetic structures,magnetic, transport, and thermal properties of U2Rh2Sn single crystals studied in part in high magnetic fields up to 58 T. The material adopts a U3Si2 related tetragonal crystal structure and orders antiferromagnetically below TN 25 K. The antiferromagnetic structure is characterized by a propagation vector k 0,0,1 2 . The magnetism in U2Rh2Sn is found to be associated mainly with 5f states. However, both unpolarized and polarized neutron experiments reveal at low temperatures in zero field non negligible magnetic moments also on Rh sites. U moments of 0.50 2 amp; 956;B are directed along the tetragonal axis while Rh moments of 0.06 4 amp; 956;B form a noncollinear arrangement confined to the basal plane. The response to applied magnetic field is highly anisotropic. Above amp; 8764;15 K the easy magnetization direction is along the tetragonal axis. At lower temperatures, however, a stronger response is found perpendicular to the c axis. While for the a axis no magnetic phase transition is observed up to 58 T, for the field applied at 1.8 K along the tetragonal axis we observe above 22.5 T a field polarized state. A magnetic phase diagram for the field applied along the c axis is presented