Landowners and game reserve managers are often faced with the decision whether to undertake consumptive (such as hunting) and/or non-consumptive (such as tourism) use of wildlife resources on their properties. Here a theoretical model was used to examine cases where the game reserve management allocated the amount of land devoted to hunting (trophy hunting) and tourism, based on three scenarios: (1) hunting is separated from tourism but wildlife is shared; (2) hunting and tourism co-exist; and (3) hunting and tourism are separated by a fence. The consumptive and non-consumptive uses are not mutually exclusive; careful planning is needed to ensure that multiple management objectives can be met. Further, the analysis indicates that the two uses may be undertaken in the same area. Whether they are spatially, or temporally separated depends on the magnitude of the consumptive use. When consumptive use is not dominant, the two are compatible in the same shared area, provided the wildlife population is sufficiently large.

The mechanical and thermal behavior of nanoglasses (NGs) were studied with a focus on the effect of the microstructure. The thermal expansion was measured to track changes in excess free volume during heating. It was found that the excess free volume, which is initially more dominant in the interphase region between the denser amorphous particles, is partially lost as well as redistributed during annealing. This relaxation during heating causes the nanoglass to behave like a melt-spun ribbon after heating while remaining amorphous. Nanomechanical tests were used to probe the local incipient plasticity and the influence of the interphase region. This interphase appears to affect the mechanical response of the NGs by inhibiting the propagation of shear bands and thus offers a novel approach for the introduction of plasticity in bulk metallic glasses. The results suggest that the NGs consist of two distinct amorphous phases with different glass transition temperatures.

The three boreal species of the winter stonefly genus Allocapnia, minima (Newport), pygmaea (Burmeister), and illinoensis Frison are subboreal species whose ranges include a band across eastern Canada from the western end of Lake Superior to the east coast; minima occurs also in Newfoundland. An analysis of variation in pygmaea and illinoensis suggests that during the Wisconsin glacial maximum these two species occurred south of the ice in the Cumberland Plateau region in east-central United States, and that they dispersed first northward through the Appalachians, then east and west into their present range. Geoclimatic evidence suggests that minima did not persist in Newfoundland during the glacial maximum. Its ecological similarity to pygmaea suggests that minima also persisted in the Cumberland Plateau area and dispersed in the same fashion as the other two species.

The structural dynamics of short-pulse laser irradiated surfaces and nano-structures has been studied with nm spatial and ultrafast temporal resolution by means of single-shot coherent XUV-scattering techniques. The experiments allowed us to time-resolve the formation of laser-induced periodic surface structures, and to follow the expansion and disintegration of nano-objects during laser ablation.

Twenty years ago the publication of Toward a Social Report by the United States Department of Health, Education and Welfare was hailed as a major forward step in developing indicators of conditions in society into a national system of social accounting of relevance to public policy. The resulting social indicators movement quickly mobilized able social scientists to produce a variety of indicators monitoring trends in their society, and internationally. National governments too began to sponsor new types of social reports. The years since have seen an apparent decline in the momentum of the social indicators movement. Hence, to evaluate developments, the Journal of Public Policy invited a number of distinguished pioneers in the movement in Europe and America to give their individual assessment of what has happened to social indicators.

In this paper, we investigate which factors determine tree clustering in Southern African savannas. This was tested by measuring clustering of trees using the T-squared sampling method in plots of the Kruger National Park experimental burning programme in South Africa. Fire return interval is the main treatment in these plots, but also several auxiliary determining parameters like clay content in the soil, diameter of tree canopies, understorey composition, tree species diversity and average annual rainfall were measured while sampling. In the Kruger National Park 48 plots distributed over four different landscape types and with three different burning treatments (never, once every 3 y and annually) were sampled. First, we related the clustering of trees to these environmental variables. When looking at the most abundant species in each plot, the analysis revealed that clustering is mainly correlated with clay content in the soil. This analysis also showed that fire frequency had a positive effect on the clustering of tree species that are not very abundant. We suggest that less abundant species might be less resistant to fire and therefore adopt a mechanism of clustering to exclude grass fires under their canopy. Finally, we tested the effect of clustering on the impact of fire on trees by analysing the relationship between the distance of a tree to its nearest neighbour and its canopy diameter. We found that clustering reduces the damaging effect of fire on trees. Our study contributes to understanding of savanna functioning by showing which processes are relevant in the distribution of savanna trees.

Organic light emitting diodes (OLED) are efficient light sources based onorganic semiconductors. Unlike inorganic LEDs which are more or less pointsources, OLED are planar light sources with up to 1 m2 in area.By using organic materials, they are cheap to produce and economical to use.The determination of triplet exciton energy levels is of interest for thedevelopment of efficient OLED, based on the fact that electrical excitationusually creates three times as many triplets as singlets. Additionally, theknowledge of these energy levels is crucial for the design and choice ofemitter matrix materials and exciton blocking layers. These values arenormally determined by photoluminescence (PL) measurements in solution formaterials which show intersystem crossing (ISC) between singlet and tripletstates. For some materials, the triplet levels cannot be measured this waybecause some materials prohibit ISC. In this work, a method is presentedwhich allows the determination of the energy levels using low-temperatureelectroluminescence (EL) spectroscopy. The dependence on ISC is avoided bycreating triplets directly with electrical excitation and this allows tomeasure a large class of organic materials. A low-temperature EL spectrum ispresented forN,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD) ina 3-phenyl-4-(1‘-naphthyl)-5-phenyl-1,2,4-triazole (TAZ) matrix (TPD/TAZ1:3) at 77 K. Triplet emission is only observed at very low charge carrierdensity (0.5 μA/mm2). Quenching processes are analyzed usingcombined EL and PL measurements and unipolar devices. Two factors can be thecause of the quenching: A strong quenching based on a low concentration ofelectrically activated impurities could explain the dependency. The otherexplanation points to a quenching based on electrons in the emitting layer.This might be explained with triplet-polaron quenching (TPQ). TPQ isproportional to the charge carrier density and contributes the dominant partto the quenching at low current densities.

Researchers from across the social sciences have found consistent deviations from the predictions of the canonical model of self-interest in hundreds of experiments from around the world. This research, however, cannot determine whether the uniformity results from universal patterns of human behavior or from the limited cultural variation available among the university students used in virtually all prior experimental work. To address this, we undertook a cross-cultural study of behavior in ultimatum, public goods, and dictator games in a range of small-scale societies exhibiting a wide variety of economic and cultural conditions. We found, first, that the canonical model – based on self-interest – fails in all of the societies studied. Second, our data reveal substantially more behavioral variability across social groups than has been found in previous research. Third, group-level differences in economic organization and the structure of social interactions explain a substantial portion of the behavioral variation across societies: the higher the degree of market integration and the higher the payoffs to cooperation in everyday life, the greater the level of prosociality expressed in experimental games. Fourth, the available individual-level economic and demographic variables do not consistently explain game behavior, either within or across groups. Fifth, in many cases experimental play appears to reflect the common interactional patterns of everyday life.

We would like to thank the commentators for their generous comments, valuable insights and helpful suggestions. We begin this response by discussing the selfishness axiom and the importance of the preferences, beliefs, and constraints framework as a way of modeling some of the proximate influences on human behavior. Next, we broaden the discussion to ultimate-level (that is evolutionary) explanations, where we review and clarify gene-culture coevolutionary theory, and then tackle the possibility that evolutionary approaches that exclude culture might be sufficient to explain the data. Finally, we consider various methodological and epistemological concerns expressed by our commentators.

The jaws of the marine worm Nereis sp. are made of protein fibers and are reinforced by zinc. Here we study a transverse section through the jaw using optical microscopy and nanoindentation. Optical microscopy images demonstrate a complex microstructure which includes channels that extend throughout the jaw. We suggest that these channels may be related to jaw remodeling. The mechanical results reveal spatial variations in both indentation hardness and reduced modulus. Specifically, the toothed side of the jaw (used for grasping food) is harder than the remainder of the jaw and the very exterior surface is hardest.

The mechanical properties of the mussel byssal thread have been investigated via nano-indentation, with the emphasis on the differences between the cuticle and the fibrous interior. The cuticle hardness was found to be 30–40% higher than that of the underlying fibrous interior. In contrast, the Young's moduli in the two regions were virtually identical to one another. Elemental analysis via energy dispersive spectroscopy indicated surprisingly high levels of Al and Br in the cuticle considering the low amounts found in seawater. A potential role of Al in byssal thread mechanics is discussed in light of the unique capability of the cuticle to accommodate strains of 70% by the underlying fibrils in the core without delamination.

The mechanical properties of the mussel byssal thread have been investigated via nano-indentation, with the emphasis on the differences between the cuticle and the fibrous interior. The cuticle hardness was found to be 30–40% higher than that of the underlying fibrous interior. In contrast, the Young's moduli in the two regions were virtually identical to one another. Elemental analysis via energy dispersive spectroscopy indicated surprisingly high levels of Al and Br in the cuticle considering the low amounts found in seawater. A potential role of Al in byssal thread mechanics is discussed in light of the unique capability of the cuticle to accommodate strains of 70% by the underlying fibrils in the core without delamination.