Private Property Rights to Wildlife: The Southern African Experiment.

In most nations around the world wildlife are owned and managed by the State. However, in the past 30 years Zimbabwe, Namibia and South Africa have altered their legal regimes to give full control over the use of wildlife to the private owners of the land on which the wildlife are located. Following the privatization of wildlife management in southern African nations, wildlife tourism on private lands has boomed. In Zimbabwe, a majority of many desirable species - including 94 percent of eland, 64 percent of kudu, 63 percent of giraffe, 56 percent of cheetah, and 53 percent of both sable and impala - are found on commercial ranch properties. In Namibia, wildlife populations on private lands have risen by 80 percent since the creation in 1967 of a regime of private wildlife ownership. Privatization of control over use of wildlife has had more success in promoting biodiversity in the southern African region than any other policy measure. Other parts of the world may be able to benefit from the lessons learned from the successes of southern African nations in privatization and commercialization of wildlife. Based on the southern African experience, many wildlife managers should reconsider whether positive incentives might not be more effective in the future in promoting wildlife populations than the past club of state commands and controls.Wildlife; Privatization; Africa; Biodiversity; Economic Development

Kiss and Fly - a study of the impacts at a UK regional airport

In the light of the forecast growth in air transport the UK Government has placed a requirement on all airports with substantial air transport movements to implement surface access strategies. The emphasis of surface access policy has been to increase the proportion of people arriving at airports by public transport by a variety of means such as managing parking supply and pricing and improving public transport. The extent to which these policies will be effective will depend on a number of factors such as the quality and availability of the alternatives, the availability of competing off-site parking and the extent to which kiss and fly is feasible. This paper reports on two studies of passenger access to Leeds-Bradford International Airport in the summers of 2004 and 2005. The airport has an aspiration to increase public transport use to the airport from its current level of 3% to 10% by 2010. The principal means by which this is currently planned to be achieved is through the expansion of scheduled bus services to Leeds, Bradford and Harrogate. The 2004 study found that 49% of passengers were dropped off at the airport by friends and that the potential for larger quantities of people to reach the airport by conventional bus services was limited. The 2005 study investigated the extent to which these kiss and fly journeys generate extra travel on the road network. The results show that for an airport with around 2.5 million passengers the Kiss & Fly journeys are creating an extra 19.4 million kilometres, an increase of 36% over the distance that would have been travelled if people had driven and parked. The paper concludes that a charge levied on all vehicles accessing the airport, similar to a congestion charge, is likely to have the greatest impact on travel behaviour and will have a far greater impact on the environment than the current emphasis on public transport improvements and parking restrictions

Social interactions in massively multiplayer online role-playing gamers

To date, most research into massively multiplayer online role-playing games (MMORPGs) has examined the demographics of play. This study explored the social interactions that occur both within and outside of MMORPGs. The sample consisted of 912 self-selected MMORPG players from 45 countries. MMORPGs were found to be highly socially interactive environments providing the opportunity to create strong friendships and emotional relationships. The study demonstrated that the social interactions in online gaming form a considerable element in the enjoyment of playing. The study showed MMORPGs can be extremely social games, with high percentages of gamers making life-long friends and partners. It was concluded that virtual gaming may allow players to express themselves in ways they may not feel comfortable doing in real life because of their appearance, gender, sexuality, and/or age. MMORPGs also offer a place where teamwork, encouragement, and fun can be experienced

Cell Therapy for Type 1 Diabetes

Acknowledgements The work described in this review was supported by a grant from the MRC. K.R.M. is supported by a fellowship from the Scottish Translational Medicines and Therapeutics Initiative through the Wellcome Trust.Peer reviewedPublisher PD

Bounds on minors of binary matrices

We prove an upper bound on sums of squares of minors of {+1, -1} matrices. The bound is sharp for Hadamard matrices, a result due to de Launey and Levin (2009), but our proof is simpler. We give several corollaries relevant to minors of Hadamard matrices, and generalise a result of Turan on determinants of random {+1,-1} matrices.Comment: 9 pages, 1 table. Typo corrected in v2. Two references and Theorem 2 added in v

Chinese Investment in Latin American Resources: The Good, the Bad, and the Ugly

China's need for vast amounts of minerals to sustain its high economic growth rate has led Chinese investors to acquire stakes in natural resource companies, extend loans to mining and petroleum investors, and write long-term procurement contracts for oil and minerals in Africa, Latin America, Australia, Canada, and other resource-rich regions. These efforts to procure raw materials might be exacerbating the problems of strong demand; "locking up" natural resource supplies, gaining preferential access to available output, and extending control over the world's extractive industries. But Chinese investment need not have a zero-sum effect if Chinese procurement arrangements expand, diversify, and make more competitive the global supplier system. Previous Peterson Institute research (see Moran 2010) and new research undertaken in this paper, show that the majority of Chinese investments and procurement arrangements serve to help diversify and make more competitive the portion of the world natural resource base located in Latin America. For a more comprehensive analysis, we conduct a structured comparison of four Peruvian mines with foreign ownership: two Organization for Economic Cooperation and Development-based, and two Chinese. We examine what conditions or policy measures are most effective in inducing Chinese investors to adopt international industry standards and best-practices, and which are not. We distill from this case study some lessons for other countries in Latin America, Africa, and elsewhere that intend to use Chinese investment to develop their extractive sectors: first, that financial markets bring accountability; second, that the host country regulatory environment makes a significant difference; and third, that foreign investment is a catalyst for change.Chinese foreign direct investment, foreign direct investment (FDI), natural resources, Peru, environmental impact, corporate social responsibility.

Gas tungsten arc welding in a microgravity environment: Work done on GAS payload G-169

GAS payload G-169 is discussed. G-169 contains a computer-controlled Gas Tungsten Arc Welder. The equipment design, problem analysis, and problem solutions are presented. Analysis of data gathered from other microgravity arc welding and terrestrial Gas Tungsten Arc Welding (GTAW) experiments are discussed in relation to the predicted results for the GTAW to be performed in microgravity with payload G-169

Monotherapy with major antihypertensive drug classes and risk of hospital admissions for mood disorders

Major depressive and bipolar disorders predispose to atherosclerosis, and there is accruing data from animal model, epidemiological, and genomic studies that commonly used antihypertensive drugs may have a role in the pathogenesis or course of mood disorders. In this study, we propose to determine whether antihypertensive drugs have an impact on mood disorders through the analysis of patients on monotherapy with different classes of antihypertensive drugs from a large hospital database of 525 046 patients with follow-up for 5 years. There were 144 066 eligible patients fulfilling the inclusion criteria: age 40 to 80 years old at time of antihypertensive prescription and medication exposure >90 days. The burden of comorbidity assessed by Charlson and Elixhauser scores showed an independent linear association with mood disorder diagnosis. The median time to hospital admission with mood disorder was 847 days for the 299 admissions (641 685 person-years of follow-up). Patients on angiotensin-converting enzyme inhibitors or angiotensin receptor blockers had the lowest risk for mood disorder admissions, and compared with this group, those on β-blockers (hazard ratio=2.11; [95% confidence interval, 1.12–3.98]; P=0.02) and calcium antagonists (2.28 [95% confidence interval, 1.13–4.58]; P=0.02) showed higher risk, whereas those on no antihypertensives (1.63 [95% confidence interval, 0.94–2.82]; P=0.08) and thiazide diuretics (1.56 [95% confidence interval, 0.65–3.73]; P=0.32) showed no significant difference. Overall, our exploratory findings suggest possible differential effects of antihypertensive medications on mood that merits further study: calcium antagonists and β-blockers may be associated with increased risk, whereas angiotensin-converting enzyme inhibitors and angiotensin receptor blockers may be associated with a decreased risk of mood disorders

A method of spherical harmonic analysis in the geosciences via hierarchical Bayesian inference

The problem of decomposing irregular data on the sphere into a set of spherical harmonics is common in many fields of geosciences where it is necessary to build a quantitative understanding of a globally varying field. For example, in global seismology, a compressional or shear wave speed that emerges from tomographic images is used to interpret current state and composition of the mantle, and in geomagnetism, secular variation of magnetic field intensity measured at the surface is studied to better understand the changes in the Earth's core. Optimization methods are widely used for spherical harmonic analysis of irregular data, but they typically do not treat the dependence of the uncertainty estimates on the imposed regularization. This can cause significant difficulties in interpretation, especially when the best-fit model requires more variables as a result of underestimating data noise. Here, with the above limitations in mind, the problem of spherical harmonic expansion of irregular data is treated within the hierarchical Bayesian framework. The hierarchical approach significantly simplifies the problem by removing the need for regularization terms and user-supplied noise estimates. The use of the corrected Akaike Information Criterion for picking the optimal maximum degree of spherical harmonic expansion and the resulting spherical harmonic analyses are first illustrated on a noisy synthetic data set. Subsequently, the method is applied to two global data sets sensitive to the Earth's inner core and lowermost mantle, consisting of PKPab-df and PcP-P differential traveltime residuals relative to a spherically symmetric Earth model. The posterior probability distributions for each spherical harmonic coefficient are calculated via Markov Chain Monte Carlo sampling; the uncertainty obtained for the coefficients thus reflects the noise present in the real data and the imperfections in the spherical harmonic expansion