Judging where a ball will go: the case of curved free kicks in football

This study examined whether adding spin to a ball in the free kick situation in football affects a professional footballer’s perception of the ball’s future arrival position. Using a virtual reality set-up, participants observed the flight paths of aerodynamically realistic free kicks with (±600 rpm) and without sidespin. With the viewpoint being fixed in the centre of the goal, participants had to judge whether the ball would have ended up in the goal or not. Results show that trajectories influenced by the Magnus force caused by sidespin gave rise to a significant shift in the percentage of goal responses. The resulting acceleration that causes the ball to continually change its heading direction as the trajectory unfolds does not seem to be taken into account by the participants when making goal judgments. We conclude that the visual system is not attuned to such accelerated motion, which may explain why goalkeepers appear to misjudge the future arrival point of such curved free kicks. Electronic Supplementary Material  Supplementary material is available for this article at .     

Application of the City Blueprint Approach to assess the challenges of water management and governance in Quito (Ecuador)

In this paper, we provide an assessment of the challenges of water, waste and climate change in the city of Quito by performing the City Blueprint Approach consisting of three assessment frameworks: (1) the Trends and Pressure Framework (TPF), (2) the City Blueprint Framework (CBF) and (3) the water Governance Capacity Framework (GCF). The TPF summarizes the main social, environmental and financial aspects that may affect urban water management. The CBF provides a clear overview of sustainable urban water management performance and its bottlenecks in municipalities and regions. The GCF comprises nine governance conditions which each consist of three indicators. The GCF provides insight in the most effective improvements to increase the governance capacity to address the identified urban water challenges. Our results show that poor wastewater treatment and long-term drinking water security are Quito’s main water challenges that may be jeopardized given the city’s rapid urbanization and economic pressure. The GCF analysis reveals that cooperation between stakeholders, implementing capacity and citizens’ awareness are the most important conditions for further development to find adequate solutions for Quito’s long-term drinking water security. We also suggest that more attention should be drawn to the transparency, accountability and participation principles. The results of Quito show that the City Blueprint Approach can serve as an affordable quick-scan to facilitate cities in their strategic planning to reach their sustainable development goals.     

Participatory incremental slum upgrading towards sustainability: an assessment of slum dwellers’ willingness and ability to pay for utility services

The concept of participatory slum upgrading has received attention in the conventional literature because it ensures and promotes the sustainability of slum-upgrading programmes. In participatory slum-upgrading programmes, slum dwellers are treated as partners, instead of recipients of the services that are provided to mitigate their deprivations. The concept thrives on the willingness and ability of slum dwellers to pay for the services. The ability of slum dwellers to pay for services, unlike their willingness to pay, has received limited research attentions. Therefore, the purpose of this study was to assess the willingness and ability of residents of a slum settlement in Kumasi in Ghana to pay for utility services. Semi-structured interview schedules were used to gather primary data from a total of 276 households. The survey data were supplemented with data from key informant interviews and focus group discussions. The results show that almost nine out of every ten households were willing to pay for water and electricity services, if these services would be supplied to them directly by the state providers. The exploitation of the residents by unregulated utility services providers partly explains their willingness to pay for the utility services. These service providers charged almost 14 times the official tariffs. The results further show that all the households who were willing to pay were also capable of paying for the services without compromising their ability to afford other life essentials. The study concludes that slum regularisation policies, programmes and projects could be designed to be incremental and participatory by making the slum dwellers, partners and drivers of the upgrading process.     

Constraints of philanthropy on determining the distribution of biodiversity conservation funding

Caught between ongoing habitat destruction and funding shortfalls, conservation organizations are using systematic planning approaches to identify places that offer the highest biodiversity return per dollar invested. However, available tools do not account for the landscape of funding for conservation or quantify the constraints this landscape imposes on conservation outcomes. Using state‐level data on philanthropic giving to and investments in land conservation by a large nonprofit organization, we applied linear regression to evaluate whether the spatial distribution of conservation philanthropy better explained expenditures on conservation than maps of biodiversity priorities, which were derived from a planning process internal to the organization and return on investment (ROI) analyses based on data on species richness, land costs, and existing protected areas. Philanthropic fund raising accounted for considerably more spatial variation in conservation spending (r² = 0.64) than either of the 2 systematic conservation planning approaches (r² = 0.08–0.21). We used results of one of the ROI analyses to evaluate whether increases in flexibility to reallocate funding across space provides conservation gains. Small but plausible “tax” increments of 1–10% on states redistributed to the optimal funding allocation from the ROI analysis could result in gains in endemic species protected of 8.5–80.2%. When such increases in spatial flexibility are not possible, conservation organizations should seek to cultivate increased support for conservation in priority locations. We used lagged correlations of giving to and spending by the organization to evaluate whether investments in habitat protection stimulate future giving to conservation. The most common outcome at the state level was that conservation spending quarters correlated significantly and positively with lagged fund raising quarters. In effect, periods of high fund raising for biodiversity followed (rather than preceded) periods of high expenditure on land conservation projects, identifying one mechanism conservation organizations could explore to seed greater activity in priority locations. Our results demonstrate how limitations on the ability of conservation organizations to reallocate their funding across space can impede organizational effectiveness and elucidate ways conservation planning tools could be more useful if they quantified and incorporated these constraints.     

Fitness consequences of within-brood dominance in the cooperatively breeding acorn woodpecker

Social dominance confers potential advantages in terms of access to superior resources, habitats, and breeding opportunities. In the cooperatively breeding acorn woodpecker (Melanerpes formicivorus), within-brood dominance among juveniles is correlated with relative body size as nestlings. Capitalizing on this relationship, we investigated the fitness consequences of dominance by means of paired comparisons of broodmates. We found that (1) larger fledglings retained at least some of their size advantage as adults; (2) overwinter survival of larger, dominant fledglings was significantly greater than subordinates, but was not relatively greater when resources were poor than when they were good; (3) among birds surviving their first winter, there were no differences vis-à-vis dominance in terms of the proportion of birds acting as helpers or inheriting their natal territory. However, larger, dominant males were present in the study area longer than subordinates, suggesting that they either survived better or were more successful at gaining reproductive opportunities; (4) if only one male broodmate became a helper instead of dispersing, he was significantly more likely to be the smaller subordinate, consistent with the view that helping is a best-of-a-bad-job strategy; and (5) there were no significant differences in reproductive success among pairs of male broodmates that cobred together as adults, consistent with prior work failing to detect a phenotypic correlation of reproductive skew. Our results indicate that within-brood dominance relationships established as juveniles have significant effects on first-year survivorship and at least some aspects of adult fitness.     

Analysis and occurrence of emerging chlorinated and brominated flame retardants in surficial sediment of the Dalian coastal area in China

The concentrations and distributions of some typical chlorinated flame retardants (Dechlorane or Mirex, Dechlorane 602 (Dec 602), Dechlorane 603 (Dec 603), Dechlorane 604 (Dec 604) and Dechlorane Plus (DP)) and brominated FRs (polybrominated diphenyl ethers (PBDEs), pentabromoethylbenzene (PBEB) and 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE)) were analyzed in surficial sediment collected from the Dalian coastal area in northeast China. Dec 603, Dec 604, and BTBPE were below their respective limits of detection (LOD) in all sediment samples, while Dechlorane, Dec 602, DP, Σ13BDE (tri- to hepta-BDEs), BDE 209, and PBEB were identified in the ranges <0.015-39.9 ng g(-1) dry weight (dw), <0.011-0.156 ng g(-1) dw, 0.69-7.00 ng g(-1) dw, 0.017-1.33 ng g(-1) dw, 3.94-103 ng g(-1) dw, and <0.073-1.9 ng g(-1) dw, respectively. Relationships between these chlorinated and brominated FRs were analyzed using Pearson's correlation and principal component analysis (PCA). DP, Dechlorane, Σ13BDE, and BDE 209 showed significantly positive correlation (p<0.05), and these relationships showed excellent agreement with PCA results. The spatial trends for Dechlorane, DP, BDE 209, and Σ13BDE showed that high concentrations were found in the industrial zone and lower concentrations in residential and garden zones. The results imply that these FRs are originating from a common source, and support the view that direct input from the effluent of sewage outlets is a major source of these compounds in Dalian sediment.     

Effects of red light camera enforcement on fatal crashes in large U.S. cities

Objective

To estimate the effects of red light camera enforcement on per capita fatal crash rates at intersections with signal lights.

Methods

From the 99 large U.S. cities with more than 200,000 residents in 2008, 14 cities were identified with red light camera enforcement programs for all of 2004-2008 but not at any time during 1992-1996, and 48 cities were identified without camera programs during either period. Analyses compared the citywide per capita rate of fatal red light running crashes and the citywide per capita rate of all fatal crashes at signalized intersections during the two study periods, and rate changes then were compared for cities with and without cameras programs. Poisson regression was used to model crash rates as a function of red light camera enforcement, land area, and population density.

Results

The average annual rate of fatal red light running crashes declined for both study groups, but the decline was larger for cities with red light camera enforcement programs than for cities without camera programs (35% vs. 14%). The average annual rate of all fatal crashes at signalized intersections decreased by 14% for cities with camera programs and increased slightly (2%) for cities without cameras. After controlling for population density and land area, the rate of fatal red light running crashes during 2004-2008 for cities with camera programs was an estimated 24% lower than what would have been expected without cameras. The rate of all fatal crashes at signalized intersections during 2004-2008 for cities with camera programs was an estimated 17% lower than what would have been expected without cameras.

Conclusions

Red light camera enforcement programs were associated with a statistically significant reduction in the citywide rate of fatal red light running crashes and a smaller but still significant reduction in the rate of all fatal crashes at signalized intersections.

Impact on Industry

The study adds to the large body of evidence that red light camera enforcement can prevent the most serious crashes. Communities seeking to reduce crashes at intersections should consider this evidence.     

Modeling attitudes and perceptions as predictors for changing safety margins during organizational change

This study describes the relations between different dimensions of leadership commitment, safety climate and attitudes toward change, and how these affect employee perceptions of safety during organizational change in a high risk environment. We collected data from a European national air navigation services provider during a volatile 3-year corporatization process that ended in the sudden collapse of a deliberate change implementation project. Surprisingly, despite visible signs of internal and external stress caused by the volatile and disruptive change process, we did not observe any change in the traditional safety metrics of incident and accident reporting during the study. The study is based on a large survey (n = 422) of individual attitudes and perceptions of safety climate, perception of leadership commitment to safety, attitudes to organizational change, and perception of safety. The data support the claim that perception of safety at least, in part, depends on individual perceptions of the leadership’s commitment to safety, and the safety climate in place at a given point in time. The model shows how employee perceptions of the leadership’s commitment to safety and safety climate are related to both attitudes toward change, and to perceived safety.