Smoothness of stabilisers in generic characteristic

Let $R$ be a commutative unital ring. Given a finitely-presented affine $R$-group $G$ acting on a finitely-presented $R$-scheme $X$ of finite type, we show that there is a prime $p_0$ so that for any $R$-algebra $k$ which is a field of characteristic $p > p_0$, the centralisers in $G_k$ of all subsets $U \subseteq X(k)$ are smooth. We prove this using the Lefschetz principle together with careful application of Gr\"{o}bner basis techniques.Comment: 15 page

The economic impact of cybercrime and cyber espionage

Introduction Is cybercrime, cyber espionage, and other malicious cyber activities what some call “the greatest transfer of wealth in human history,” or is it what others say is a “rounding error in a fourteen trillion dollar economy?” The wide range of existing estimates of the annual loss—from a few billion dollars to hundreds of billions—reflects several difficulties. Companies conceal their losses and some are not aware of what has been taken. Intellectual property is hard to value. Some estimates relied on surveys, which provide very imprecise results unless carefully constructed. One common problem with cybersecurity surveys is that those who answer the questions “self-select,” introducing a possible source of distortion into the results. Given the data collection problems, loss estimates are based on assumptions about scale and effect— change the assumption and you get very different results. These problems leave many estimates open to question. The Components of Malicious Cyber Activity In this initial report we start by asking what we should count in estimating losses from cybercrime and cyber espionage. We can break malicious cyber activity into six parts: The loss of intellectual property and business confidential information Cybercrime, which costs the world hundreds of millions of dollars every year The loss of sensitive business information, including possible stock market manipulation Opportunity costs, including service and employment disruptions, and reduced trust for online activities The additional cost of securing networks, insurance, and recovery from cyber attacks Reputational damage to the hacked company Put these together and the cost of cybercrime and cyber espionage to the global economy is probably measured in the hundreds of billions of dollars. To put this in perspective, the World Bank says that global GDP was about $70 trillion in 2011. A$400 billion loss—the high end of the range of probable costs—would be a fraction of a percent of global income. But this begs several important questions about the full benefit to the acquirers and the damage to the victims from the cumulative effect of cybercrime and cyber espionage

Maritime Piracy and Armed Robbery Confrontations Across the Globe: Can Crew Action Shape the Outcomes?

Abstract The recent tightening of military budget constraints has called into question the feasibility of costly multilateral naval intervention used to combat maritime piracy off the eastern coast of Africa. Though past studies agree that the transformation of the Somali economy and government is crucial for a long-term solution to piracy in this part of the world, short to medium-run solutions are needed to bridge the gap. Such solutions should be fiscally sensible and serve as effective deterrents, as well as be applicable in addressing the problem of piracy and maritime armed robbery in other parts of the globe. In this paper, I build upon the foundations laid in Mejia, Cariou, & Wolff (2009) and Mileski, Mejia, & Carchidi (2013) by examining the following question: given that a ship is engaged by pirates, what factors help shape the outcome of the confrontation? I find that observable action taken on the part of a ship\u27s crew is extremely effective in decreasing the risk of a ship being successfully robbed or hijacked. There has yet to be a reported incident where pirates successfully hijacked a vessel that had a security team on board, and so though the effectiveness of security in this matter can be inferred, it cannot be empirically tested. This may provide some guidance for policymakers; if naval intervention is to be scaled back, the encouragement and oversight of shipping companies\u27 crew response procedures (and perhaps of onboard security measures) by international governments could pose a valid alternative

Pushing NRQCD to the limit

Lattice NRQCD has proven successful in describing the physics of the upsilon system and B-mesons, though some concerns arise when it is used in simulations of charm quarks. It is certainly possible that the NRQCD expansion is not converging fast enough at this scale. We present some preliminary results on the low-mass breakdown of NRQCD, in particular the behaviour of heavy quarkonium and heavy-light meson spectra as the bare heavy quark mass is decreased well below 1, with the aim of understanding more about the manifestation of this breakdown.Comment: Lattice 99 submission, 3 Pages, 3 eps figure

Communicating contested geoscience to the public: Moving from ‘matters of fact’ to ‘matters of concern’

Geological issues are increasingly intruding on the everyday lives of ordinary people. Whether it is the onshore extraction of oil and gas, the subsurface injection of waters for geothermal power or the deep storage of waste products, communities across the world are being confronted with controversial geological interventions beneath their backyards. Communicating these complex scientific and technical issues is made more challenging by the general public's unfamiliarity with the geological realm. Cognitive studies confirm a cultural dissonance with the subsurface and highlight lay anxieties about tampering with nature. In addressing those concerns, factual information is argued to be subordinate to values and beliefs in shaping public perspectives on contested geoscientific issues. In this context, scientists' attention to technical accuracy and their emphasis on professional consensus may do little to influence multiple publics whose worries instead root into their sense of place, trust and governance, as well as equity and ethics. With a growing recognition that it is social rather than technical factors that stir public unease and fuel community outrage, geoscientists need to develop new strategies to engage dissonant publics, underpinned by a culture change in geocommunication from conveying ‘matters of fact’ to brokering ‘matters of concern’

Community Economic Development, Community Development Finance: Introducing the Terms Exploring the Relationship

How the two terms community economic development and community development finance are defined is crucial to the construction of any development system, whether it be geographic or functional in scope. What the terms are thought to entail will influence the fundamental direction of any effort. In this article, the authors set out what is generally accepted as the connotation of these terms, and then report the particular principles that appear to underlie the most effective practice in CED and Community Development finance

Preliminary genetic analyses of important musculoskeletal conditions of thoroughbred racehorses in Hong Kong

A retrospective cohort study of important musculoskeletal conditions of Thoroughbred racehorses was conducted using health records generated over a 15 year period (n = 5062, 1296 sires). The prevalence of each condition in the study population was: fracture, 13%; osteoarthritis, 10%; suspensory ligament injury, 10%; and tendon injury, 19%. Linear and logistic sire and animal regression models were built to describe the binary occurrence of these musculoskeletal conditions, and to evaluate the significance of possible environmental risk factors. The heritability of each condition was estimated using residual maximum likelihood (REML). Bivariate mixed models were used to generate estimates of genetic correlations between each pair of conditions.<p></p> Heritability estimates of fracture, osteoarthritis, suspensory ligament and tendon injury were small to moderate (range: 0.01–0.20). Fracture was found to be positively genetically correlated with both osteoarthritis and suspensory ligament injury. These results suggest that there is a significant genetic component involved in the risk of the studied conditions. Due to positive genetic correlations, a reduction in prevalence of one of the correlated conditions may effect a reduction in risk of the other condition.<p></p&gt

Ensemble Concerts: The Renaissance Ensemble, November 21, 1974

Centennial East Recital HallThursday EveningNovember 21, 19747:00 p.m

The population of propellers in Saturn's A Ring

We present an extensive data set of ~150 localized features from Cassini images of Saturn's Ring A, a third of which are demonstrated to be persistent by their appearance in multiple images, and half of which are resolved well enough to reveal a characteristic "propeller" shape. We interpret these features as the signatures of small moonlets embedded within the ring, with diameters between 40 and 500 meters. The lack of significant brightening at high phase angle indicates that they are likely composed primarily of macroscopic particles, rather than dust. With the exception of two features found exterior to the Encke Gap, these objects are concentrated entirely within three narrow (~1000 km) bands in the mid-A Ring that happen to be free from local disturbances from strong density waves. However, other nearby regions are similarly free of major disturbances but contain no propellers. It is unclear whether these bands are due to specific events in which a parent body or bodies broke up into the current moonlets, or whether a larger initial moonlet population has been sculpted into bands by other ring processes.Comment: 31 pages, 10 figures; Accepted at A