Changes over time in population level transport satisfaction and mode of travel: a 13 year repeat cross-sectional study, UK

Aim: The aim of the study was to examine changes over time in satisfaction with usual transport mode, explore individual and area level characteristics as mediators in the likelihood of transport satisfaction, and whether any changes in transport satisfaction varied by these factors over time. Methods: Adults from West Central Scotland, United Kingdom, who participated at both waves of the repeat cross-sectional ‘Transport, Health and Well-being Study’ conducted in 1997 (n=2735) and 2010 (n=2024) were assessed. Individuals completed a detailed postal questionnaire at both time points including self-rated satisfaction with usual transport mode (using a seven point scale subsequently dichotomised to a binary outcome of satisfied (1–2) and other (3–7)). Participants reported usual transport mode for travel to various destinations. A multilevel logistic regression model was used and individuals were nested within areas (c. 4000 population). Results: At the 2010 sweep, two thirds (n=1345) of individuals were satisfied with their transport choice. Those with fair/poor health were less satisfied with their usual transport compared to those in better health (Odds Ratio (OR) 0.49, p<0.001). Access to a car was associated with overall transport satisfaction (OR 2.63, p<0.001) and the effect of deprivation on transport satisfaction was mitigated when adjusted by household car access. Transport satisfaction increased more from 1997 to 2010 for retired individuals compared to those in employment (OR 1.40, p=0.032), and for those who travelled by public transport (OR 2.39, p=0.005) and using multiple modes (OR 2.19, p<0.001) compared to those who travelled by car. Conclusions: The proportion of those who travelled using public transport, active modes or by multiple mode increased journey satisfaction over time at a greater rate than those who travelled by car, highlighting that continued efforts should be made to promote these more active transport modes which have potential to impact on health

Photometric Redshift Biases from Galaxy Evolution

Proposed cosmological surveys will make use of photometric redshifts of galaxies that are significantly fainter than any complete spectroscopic redshift surveys that exist to train the photo-z methods. We investigate the photo-z biases that result from known differences between the faint and bright populations: a rise in AGN activity toward higher redshift, and a metallicity difference between intrinsically luminous and faint early-type galaxies. We find that even very small mismatches between the mean photometric target and the training set can induce photo-z biases large enough to corrupt derived cosmological parameters significantly. A metallicity shift of ~0.003dex in an old population, or contamination of any galaxy spectrum with ~0.2% AGN flux, is sufficient to induce a 10^-3 bias in photo-z. These results highlight the danger in extrapolating the behavior of bright galaxies to a fainter population, and the desirability of a spectroscopic training set that spans all of the characteristics of the photo-z targets, i.e. extending to the 25th mag or fainter galaxies that will be used in future surveys

Balancing the demands of two tasks: an investigation of cognitive–motor dual-tasking in relapsing remitting multiple sclerosis

Background: People with relapsing remitting multiple sclerosis (PwRRMS) suffer disproportionate decrements in gait under dual-task conditions, when walking and a cognitive task are combined. There has been much less investigation of the impact of cognitive demands on balance. Objectives: This study investigated whether: (1) PwRRMS show disproportionate decrements in postural stability under dual-task conditions compared to healthy controls, and (2) dual-task decrements are associated with everyday dual-tasking difficulties. The impact of mood, fatigue, and disease severity on dual-tasking was also examined. Methods: A total of 34 PwRRMS and 34 matched controls completed cognitive (digit span) and balance (movement of center of pressure on Biosway on stable and unstable surfaces) tasks under single- and dual-task conditions. Everyday dual-tasking was measured using the Dual-Tasking Questionnaire. Mood was measured by the Hospital Anxiety & Depression Scale. Fatigue was measured via the Modified Fatigue Index Scale. Results: No differences in age, gender, years of education, estimated pre-morbid IQ, or baseline digit span between groups. Compared with controls, PwRRMS showed significantly greater decrement in postural stability under dual-task conditions on an unstable surface (p=.007), but not a stable surface (p=.679). Balance decrement scores were not correlated with everyday dual-tasking difficulties or fatigue. Stable surface balance decrement scores were significantly associated with levels of anxiety (rho=0.527; p=.001) and depression (rho=0.451; p=.007). Conclusions: RRMS causes dual-tasking difficulties, impacting balance under challenging conditions, which may contribute to increased risk of gait difficulties and falls. The relationship between anxiety/depression and dual-task decrement suggests that emotional factors may be contributing to dual-task difficulties

Stable isotopic and trace metal analyses of two Porites Lobata colonies - Oahu, Hawaii: implications for past seasonal variation and sea surface temperatures and anthropogenic effects on the reef environment

Corals from the western and equatorial Pacific Ocean have been extensively studied for the purposes of generating paleoclimate reconstructions spanning the last several hundred years. However, in the central subtropical North Pacific, there are currently few published coral records extending beyond 10 to 20 years. The hermatypic coral species Porites lobata and Porites lutea have proven to be useful indicators of paleoclimate and past sea surface conditions at other locations. Here I have analyzed two Porites lobata coral cores collected from colonies from opposite sides of Oahu, Hawaii to assess their utility for developing multi-decadal length climatic reconstructions in this region.The two coral records are from Punalu\u27u Beach (157.881607°W, 21.576752°N) and Waikiki Beach (157.881607° W, 21.576752° N) and presented here are isotopic (δ18O and δ13C) and trace metal data (Sr/Ca, Pb, and other metals) from these two corals. An absolute increase in sea surface temperatures of 1°C over the last 40 years is clear in the instrumental SST data, along with a clear bias towards the times of maximum SST during a negative phase of the Pacific Decadal Oscillation (PDO). Lead (Pb) concentration for one of the corals also coincides with the change in the PDO seen in 1976, with Pb concentrations decreasing from ~4-6ppm to between 0.5-1ppm. However, I infer this decline in concentration is more probably due to the elimination of lead in gasoline. Other trace metal data trends show increased concentrations of specific metals during times of known Kona storm events. Presented here is the longest sub-annual resolution paleoclimate record derived from Hawaiian corals along with a comprehensive analysis of their usefulness as a paleoclimate and environmental change indicator

The phrase structure of phase verbs: An initial contrastive analysis of English and Russian

This squib carries out an initial contrastive analysis of English and Russian phase (a.k.a. aspectual) verbs. Following Fukuda’s (2008; 2009) syntactic account of English, I assume English phase verbs can head one of two aspectual functional projections: H-AspP, located immediately above vP; or L-AspP, located between vP and VP. Applying the same diagnostics to Russian, it appears that Russian phase verbs head only L-AspP. The relation between L-AspP and another structurally similar aspectual projection, AspP, proposed by Mac- Donald (2008a;b), is discussed. We see that L-AspP has a subset of the aspectual properties of AspP. Finally, I note how this approach to Russian phase verbs leads to the expectation that semantic properties of Russian phase verb complements play a role in some of the phase verb complement (in)compatibility patterns. In concrete, I suggest that the aspectual class of the complement plays a role

Low-cost, multi-agent systems for planetary surface exploration

The use of off-the-shelf consumer electronics combined with top-down design methodologies have made small and inexpensive satellites, such as CubeSats, emerge as viable, low-cost and attractive space-based platforms that enable a range of new and exciting mission scenarios. In addition, to overcome some of the resource limitation issues encountered with these platforms, distributed architectures have emerged to enable complex tasks through the use of multiple low complexity units. The low-cost characteristics of such systems coupled with the distributed architecture allows for an increase in the size of the system beyond what would have been feasible with a monolithic system, hence widening the operational capabilities without significantly increasing the control complexity of the system. These ideas are not new for Earth orbiting devices, but excluding some distributed remote sensing architectures they are yet to be applied for the purpose of planetary exploration. Experience gained through large rovers demonstrates the value of in-situ exploration, which is however limited by the associated high-cost and risk. The loss of a rover can and has happened because of a number of possible failures: besides the hazards directly linked to the launch and journey to the target-body, hard landing and malfunctioning of parts are all threats to the success of the mission. To overcome these issues this paper introduces the concept of using off-the-shelf consumer electronics to deploy a low-cost multi-rover system for future planetary surface exploration. It is shown that such a system would significantly reduce the programmatic-risk of the mission (for example catastrophic failure of a single rover), while exploiting the inherent advantages of cooperative behaviour. These advantages are analysed with a particular emphasis put upon the guidance, navigation and control of such architectures using the method of artificial potential field. Laboratory tests on multi-agent robotic systems support the analysis. Principal features of the system are identified and the underlying advantages over a monolithic single-agent system highlighted

Arithmetic patches, weak tangents, and dimension

The first named author is supported by a Leverhulme Trust Research Fellowship (RF-2016-500) and the second named author is supported by a PhD scholarship provided bythe School of Mathematics in the University of St AndrewsWe investigate the relationships between several classical notions in arithmetic combinatorics and geometry including the presence (or lack of) arithmetic progressions (or patches in dimensions at least 2), the structure of tangent sets, and the Assouad dimension. We begin by extending a recent result of Dyatlov and Zahl by showing that a set cannot contain arbitrarily large arithmetic progressions (patches) if it has Assouad dimension strictly smaller than the ambient spatial dimension. Seeking a partial converse, we go on to prove that having Assouad dimension equal to the ambient spatial dimension is equivalent to having weak tangents with non-empty interior and to ‘asymptotically’ containing arbitrarily large arithmetic patches. We present some applications of our results concerning sets of integers, which include a weak solution to the Erdös–Turán conjecture on arithmetic progressions.PostprintPeer reviewe

Against stativizing negation, expletive negation and NPI-until

We present a novel account of phenomena that have been discussed under the labels stativizing negation, expletive negation and the licensing of NPI-(eventive-)until. We argue that these concepts are theoretically undesirable as well as descriptively inadequate because (a) negation does not affect event structure, (b) “eventive” until outscopes negation and can also occur without negation, so it cannot be treated as an NPI, and (c) the properties ascribed to negation and/or until are observed in a wide variety of contexts and should therefore receive a more general, non-lexical analysis. Our account derives the facts from the idea that until- and for-duratives are referential items that scope in the topic field and can receive a contrastive interpretation on analogy with regular topics. This gives us a handle on the socalled “actualization” observed with negated eventives in the scope of a durative, previously handled by lexical duplication of until and by stipulation of idiosyncratic lexical properties