Three Approaches to Task-based Syllabus Design

Choice of the unit of analysis in syllabus design is crucial for all aspects of a language teaching program. A variety of units, including word, structure, notion, function, topic and situation, continue to be employed in synthetic, Type A syllabuses. While each is relevant for analyses of the target language and its use, native-like linguistic elements find little support as meaningful acquisition units from a language learner's perspective. Task has more recently appeared as the unit of analysis in three analytic, (primarily) Type B alternatives: procedural, process and task syllabuses. Each of these has certain limitations, too, but when the task syllabus is combined with a focus on form in Task-Based Language Teaching, the task receives more support in SLA research as a viable unit around which to organize language teaching and learning opportunities

A Statistical Analysis of the Solar Phenomena Associated with Global EUV Waves

Solar eruptions are the most spectacular events in our solar system and are associated with many different signatures of energy release including solar flares, coronal mass ejections, global waves, radio emission and accelerated particles. Here, we apply the Coronal Pulse Identification and Tracking Algorithm (CorPITA) to the high cadence synoptic data provided by the Solar Dynamic Observatory (SDO) to identify and track global waves observed by SDO. 164 of the 362 solar flare events studied (45%) are found to have associated global waves with no waves found for the remaining 198 (55%). A clear linear relationship was found between the median initial velocity and the acceleration of the waves, with faster waves exhibiting a stronger deceleration (consistent with previous results). No clear relationship was found between global waves and type II radio bursts, electrons or protons detected in-situ near Earth. While no relationship was found between the wave properties and the associated flare size (with waves produced by flares from B to X-class), more than a quarter of the active regions studied were found to produce more than one wave event. These results suggest that the presence of a global wave in a solar eruption is most likely determined by the structure and connectivity of the erupting active region and the surrounding quiet solar corona rather than by the amount of free energy available within the active region.Comment: 33 pages, 6 figures, 1 table. Accepted for publication in Solar Physic

SDSS-IV MaNGA: The intrinsic shape of slow rotator early-type galaxies

By inverting the distributions of galaxies' apparent ellipticities and misalignment angles (measured around the projected half-light radius $R_{\rm e}$) between their photometric and kinematic axes, we study the intrinsic shape distribution of 189 slow rotator early-type galaxies with stellar masses $2\times 10^{11} M_{\odot}<M_\ast<2\times 10^{12} M_{\odot}$, extracted from a sample of about 2200 galaxies with integral-field stellar kinematics from the DR14 of the SDSS-IV MaNGA IFU survey. Thanks to the large sample of slow rotators, Graham+18 showed that there is clear structure in the misalignment angle distribution, with two peaks at both $0^{\circ}$ and $90^{\circ}$ misalignment (characteristic of oblate and prolate rotation respectively). Here we invert the observed distribution from Graham+18. The large sample allows us to go beyond the known fact that slow rotators are weakly triaxial and to place useful constraints on their intrinsic triaxiality distribution (around $1R_{\rm e}$) for the first time. The shape inversion is generally non-unique. However, we find that, for a wide set of model assumptions, the observed distribution clearly requires a dominant triaxial-oblate population. For some of our models, the data suggest a hint for a minor triaxial-prolate population, but a dominant prolate population is ruled out.Comment: Accepted for publication in ApJL, 10 pages, 4 figures, 1 tabl

Experimental measurement of local burning velocity within a rotating flow

The work presented in this paper details the implementation of a new technique for the measurement of local burning velocity using asynchronous particle image velocimetry. This technique uses the local flow velocity ahead of the flame front to measure the movement of the flame by the surrounding fluid. This information is then used to quantify the local burning velocity by taking into account the translation of the flame via convection. In this paper the developed technique is used to study the interaction between a flame front and a single toroidal vortex for the case of premixed stoichiometric methane and air combustion. This data is then used to assess the impact of vortex structure on flame propagation rates. The burning velocity data demonstrates that there is a significant enhancement to the rate of flame propagation where the flame directly interacts with the rotating vortex. The increases found were significantly higher than expected but are supported by burning velocities [22-24] found in turbulent flames of the same mixture composition. Away from this interaction with the main vortex core, the flame exhibits propagation rates around the value recorded in literature for unperturbed laminar combustion [18-21]

Regulatory Structures and their Impact on the Sustainability Performance of Public Transport in World Cities

This paper describes a new measure of the sustainability performance of public transport in 88 world cities adopting 15 indicators including Environmental, Social, Economic and System Effectiveness sustainability. Sustainability performance is then explored for cities with only “Public” operations or others with some degree of commercial operation (“Non-Public”) Results show no significant difference in aggregate total sustainability indicator scores between world cities with “Public”/“Non-Public” operations. However Social Sustainability indicators are significantly different with “Public” operations having better Social Sustainability performance than “Non-Public”. For individual component indicators, three of the four Social Sustainability component indicators have average normalised scores suggesting statistically significant differences between “Public” and “Non-Public” city scores with “Public” cities performing better than “Non-Public”. The indicators and their relative advantage to “Public” cities being Trip distance (24%), Affordability (34%) and PT related deaths (29%). However results also show that operating costs per passenger km and cost recovery are higher in “Non-Public” cities suggesting higher elements of Economic Sustainability in “Non-Public” based Public Transport cities The paper concludes with a summary and discussion of the results including implications for regulatory practices and areas for future research.Institute of Transport and Logistics Studies. Faculty of Economics and Business. The University of Sydne