Showing papers by "Stockholm University published in 2003"

Climate Change, Human Impacts, and the Resilience of Coral Reefs

Abstract: The diversity, frequency, and scale of human impacts on coral reefs are increasing to the extent that reefs are threatened globally. Projected increases in carbon dioxide and temperature over the next 50 years exceed the conditions under which coral reefs have flourished over the past half-million years. However, reefs will change rather than disappear entirely, with some species already showing far greater tolerance to climate change and coral bleaching than others. International integration of management strategies that support reef resilience need to be vigorously implemented, and complemented by strong policy decisions to reduce the rate of global warming.

Megaprojects and Risk: An Anatomy of Ambition

Abstract: Promoters of multi-billion dollar land-use development megaprojects systematically misinform parliaments, the public and the media in order to get them approved and built This book not only explores these issues, but suggests practical solutions drawing on theory and scientific evidence from the several hundred projects in twenty nations and five continents It is of interest to students, scholars, planners, economists, auditors, politicians and concerned citizens

Cosmological Results from High-z Supernovae* **

Abstract: The High-z Supernova Search Team has discovered and observed eight new supernovae in the redshift interval z = 0.3-1.2. These independent observations, analyzed by similar but distinct methods, confirm the results of Riess and Perlmutter and coworkers that supernova luminosity distances imply an accelerating universe. More importantly, they extend the redshift range of consistently observed Type Ia supernovae (SNe Ia) to z ≈ 1, where the signature of cosmological effects has the opposite sign of some plausible systematic effects. Consequently, these measurements not only provide another quantitative confirmation of the importance of dark energy, but also constitute a powerful qualitative test for the cosmological origin of cosmic acceleration. We find a rate for SN Ia of (1.4 ± 0.5) × 10-4 h3 Mpc-3 yr-1 at a mean redshift of 0.5. We present distances and host extinctions for 230 SN Ia. These place the following constraints on cosmological quantities: if the equation of state parameter of the dark energy is w = -1, then H0t0 = 0.96 ± 0.04, and ΩΛ - 1.4ΩM = 0.35 ± 0.14. Including the constraint of a flat universe, we find ΩM = 0.28 ± 0.05, independent of any large-scale structure measurements. Adopting a prior based on the Two Degree Field (2dF) Redshift Survey constraint on ΩM and assuming a flat universe, we find that the equation of state parameter of the dark energy lies in the range -1.48 -1, we obtain w < -0.73 at 95% confidence. These constraints are similar in precision and in value to recent results reported using the WMAP satellite, also in combination with the 2dF Redshift Survey.

Response diversity, ecosystem change, and resilience

Abstract: Biological diversity appears to enhance the resilience of desirable ecosystem states, which is required to secure the production of essential ecosystem services. The diversity of responses to environmental change among species contributing to the same ecosystem function, which we call response diversity, is critical to resilience. Response diversity is particularly important for ecosystem renewal and reorganization following change. Here we present examples of response diversity from both terrestrial and aquatic ecosystems and across temporal and spatial scales. Response diversity provides adaptive capacity in a world of complex systems, uncertainty, and human-dominated environments. We should pay special attention to response diversity when planning ecosystem management and restoration, since it may contribute considerably to the resilience of desired ecosystem states against disturbance, mismanagement, and degradation.

New Constraints on ΩM, ΩΛ, and w from an Independent Set of 11 High-Redshift Supernovae Observed with the Hubble Space Telescope*

Abstract: We report measurements of $\Omega_M$, $\Omega_\Lambda$, and w from eleven supernovae at z=0.36-0.86 with high-quality lightcurves measured using WFPC-2 on the HST. This is an independent set of high-redshift supernovae that confirms previous supernova evidence for an accelerating Universe. Combined with earlier Supernova Cosmology Project data, the new supernovae yield a flat-universe measurement of the mass density $\Omega_M=0.25^{+0.07}_{-0.06}$ (statistical) $\pm0.04$ (identified systematics), or equivalently, a cosmological constant of $\Omega_\Lambda=0.75^{+0.06}_{-0.07}$ (statistical) $\pm0.04$ (identified systematics). When the supernova results are combined with independent flat-universe measurements of $\Omega_M$ from CMB and galaxy redshift distortion data, they provide a measurement of $w=-1.05^{+0.15}_{-0.20}$ (statistical) $\pm0.09$ (identified systematic), if w is assumed to be constant in time. The new data offer greatly improved color measurements of the high-redshift supernovae, and hence improved host-galaxy extinction estimates. These extinction measurements show no anomalous negative E(B-V) at high redshift. The precision of the measurements is such that it is possible to perform a host-galaxy extinction correction directly for individual supernovae without any assumptions or priors on the parent E(B-V) distribution. Our cosmological fits using full extinction corrections confirm that dark energy is required with $P(\Omega_\Lambda>0)>0.99$, a result consistent with previous and current supernova analyses which rely upon the identification of a low-extinction subset or prior assumptions concerning the intrinsic extinction distribution.

Prediction of lipoprotein signal peptides in Gram-negative bacteria

Abstract: A method to predict lipoprotein signal peptides in Gram-negative Eubacteria, LipoP, has been developed. The hidden Markov model (HMM) was able to distinguish between lipoproteins (SPaseII-cleaved proteins), SPaseI-cleaved proteins, cytoplasmic proteins, and transmembrane proteins. This predictor was able to predict 96.8% of the lipoproteins correctly with only 0.3% false positives in a set of SPaseI-cleaved, cytoplasmic, and transmembrane proteins. The results obtained were significantly better than those of previously developed methods. Even though Gram-positive lipoprotein signal peptides differ from Gram-negatives, the HMM was able to identify 92.9% of the lipoproteins included in a Gram-positive test set. A genome search was carried out for 12 Gram-negative genomes and one Gram-positive genome. The results for Escherichia coli K12 were compared with new experimental data, and the predictions by the HMM agree well with the experimentally verified lipoproteins. A neural network-based predictor was developed for comparison, and it gave very similar results. LipoP is available as a Web server at www.cbs.dtu.dk/services/LipoP/.

Economic Geography and Public Policy

Abstract: Research on the spatial aspects of economic activity has flourished over the past decade due to the emergence of new theory, new data, and an intense interest on the part of policymakers, especially in Europe but increasingly in North America and elsewhere as well. However, these efforts - collectively known as the "new economic geography" - have devoted little attention to the policy implications of the new theory. "Economic Geography and Public Policy" fills the gap by illustrating many new policy insights economic geography models can offer to the realm of theoretical policy analysis. Focusing primarily on trade policy, tax policy, and regional policy, Richard Baldwin and coauthors show how these models can be used to make sense of real-world situations. The book not only provides much fresh analysis but also synthesizes insights from the existing literature. The authors begin by presenting and analyzing the widest range of new economic geography models to date. From there, they proceed to examine previously unaddressed welfare and policy issues including, in separate sections, trade policy (unilateral, reciprocal, and preferential), tax policy (agglomeration with taxes and public goods, tax competition and agglomeration), and regional policy (infrastructure policies and the political economy of regional subsidies). A well-organized, engaging narrative that progresses smoothly from fundamentals to more complex material, "Economic Geography and Public Policy" is essential reading for graduate students, researchers, and policymakers seeking new approaches to spatial policy issues.

The relationship of average volume of alcohol consumption and patterns of drinking to burden of disease: an overview.

Abstract: Aims As part of a larger study to estimate the global burden of disease attributable to alcohol: • to quantify the relationships between average volume of alcohol consumption, patterns of drinking and disease and injury outcomes, and • to combine exposure and risk estimates to determine regional and global alcohol-attributable fractions (AAFs) for major disease and injury categories. Design, methods, setting Systematic literature reviews were used to select diseases related to alcohol consumption. Meta-analyses of the relationship between alcohol consumption and disease and multi-level analyses of aggregate data to fill alcohol–disease relationships not currently covered by individual-level data were used to determine the risk relationships between alcohol and disease. AAFs were estimated as a function of prevalence of exposure and relative risk, or from combining the aggregate multi-level analyses with prevalence data. Findings Average volume of alcohol consumption was found to increase risk for the following major chronic diseases: mouth and oropharyngeal cancer; oesophageal cancer; liver cancer; breast cancer; unipolar major depression; epilepsy; alcohol use disorders; hypertensive disease; hemorrhagic stroke; and cirrhosis of the liver. Coronary heart disease (CHD), unintentional and intentional injuries were found to depend on patterns of drinking in addition to average volume of alcohol consumption. Most effects of alcohol on disease were detrimental, but for certain patterns of drinking, a beneficial influence on CHD, stroke and diabetes mellitus was observed. Conclusions Alcohol is related to many major disease outcomes, mainly in a detrimental fashion. While average volume of consumption was related to all disease and injury categories under consideration, pattern of drinking was found to be an additional influencing factor for CHD and injury. The influence of patterns of drinking may be underestimated because pattern measures have not been included in many epidemiologic studies. Generalizability of the results is limited by methodological problems of the underlying studies used in the present analyses. Future studies need to address these methodological issues in order to obtain more accurate risk estimates.

New Politics and Class Politics in the Context of Austerity and Globalization: Welfare State Regress in 18 Countries, 1975-95

Abstract: The relevance of socioeconomic class and of class-related parties for policymaking is a recurring issue in the social sciences. The “new politics” perspective holds that in the present era of austerity, class-based parties once driving welfare state expansion have been superseded by powerful new interest groups of welfare-state clients capable of largely resisting retrenchment pressures emanating from postindustrial forces. We argue that retrenchment can fruitfully be analyzed as distributive conflict involving a remaking of the early postwar social contract based on the full employment welfare state, a conflict in which partisan politics and welfare-state institutions are likely to matter. Pointing to problems of conceptualization and measurement of the dependent variable in previous research, we bring in new data on the extent of retrenchment in social citizenship rights and show that the long increase in social rights has been turned into a decline and that significant retrenchment has taken place in several countries. Our analyses demonstrate that partisan politics remains significant for retrenchment also when we take account of contextual indictors, such as constitutional veto points, economic factors, and globalization.Author names are in alphabetical order and they share equal responsibility for the manuscript. Early versions of this paper were presented at annual meetings of the Nordic Political Science Association in Aalborg, 2002, and the American Political Science Association in San Francisco, 2001, the International Sociological Association RC 28 meeting in Mannheim, 2001, the International Sociological Association RC 19 meeting in Tilburg 2000, and the American Sociological Association in Washington, DC, 2000, as well as at various seminars. For constructive comments on different versions of the manuscript we thank Rainer Lepsius, Anders Lindbom, Ingalill Montanari, John Myles, Michael Shalev, Sheila Shaver, and Robin Stryker, as well as other participants in these meetings. We want to thank Olof Backman, Stefan Englund, Ingrid Esser, Helena Hoog, and Annita Nasstrom for very valuable help and Dennis Quinn for providing us his data on international financial deregulation. Our thanks are also due to three anonymous referees for careful reading. This research has been supported by grants from the Bank of Sweden Tercentennial Foundation and the Swedish Council for Social Research.

Improved automatic keyword extraction given more linguistic knowledge

Abstract: In this paper, experiments on automatic extraction of keywords from abstracts using a supervised machine learning algorithm are discussed. The main point of this paper is that by adding linguistic knowledge to the representation (such as syntactic features), rather than relying only on statistics (such as term frequency and n-grams), a better result is obtained as measured by keywords previously assigned by professional indexers. In more detail, extracting NP-chunks gives a better precision than n-grams, and by adding the PoS tag(s) assigned to the term as a feature, a dramatic improvement of the results is obtained, independent of the term selection approach applied.

Is There a Glass Ceiling in Sweden

Abstract: Using 1998 data, we show that the gender log wage gap in Sweden increases throughout the wage distribution and accelerates in the upper tail. We interpret this as a strong glass ceiling effect. We use quantile regression decompositions to examine whether this pattern can be ascribed primarily to gender differences in labor market characteristics or in the rewards to those characteristics. Even after extensive controls for gender differences in age, education (both level and field), sector, industry, and occupation, we find that the glass ceiling effect we see in the raw data persists to a considerable extent.

Can correct protein models be identified

Abstract: The ability to separate correct models of protein structures from less correct models is of the greatest importance for protein structure prediction methods. Several studies have examined the ability of different types of energy function to detect the native, or native-like, protein structure from a large set of decoys. In contrast to earlier studies, we examine here the ability to detect models that only show limited structural similarity to the native structure. These correct models are defined by the existence of a fragment that shows significant similarity between this model and the native structure. It has been shown that the existence of such fragments is useful for comparing the performance between different fold recognition methods and that this performance correlates well with performance in fold recognition. We have developed ProQ, a neural-network-based method to predict the quality of a protein model that extracts structural features, such as frequency of atom-atom contacts, and predicts the quality of a model, as measured either by LGscore or MaxSub. We show that ProQ performs at least as well as other measures when identifying the native structure and is better at the detection of correct models. This performance is maintained over several different test sets. ProQ can also be combined with the Pcons fold recognition predictor (Pmodeller) to increase its performance, with the main advantage being the elimination of a few high-scoring incorrect models. Pmodeller was successful in CASP5 and results from the latest LiveBench, LiveBench-6, indicating that Pmodeller has a higher specificity than Pcons alone.

Being there... and there... and there! Reflections on Multi-Site Ethnography

Abstract: Multi-site, or multilocal, field work has become increasingly practiced and acknowledged in anthropology since the 1980s Drawing on several field studies by anthropologists at Stockholm University but particularly on the author's study of the work of news media foreign correspondents, this article identifies differences in practices and assumptions between such work and the classic model of single-site field work as enunciated in the mid-20th century It discusses the construction of multi-site fields, including the selection of sites; the quality of relationships with informants in such fields; the temporal aspects of field work and of the sites themselves; the dominant types of data in multi-site studies; and the fit between field work and organizational and career circumstances; as well as particular topics dealt with in the foreign correspondent study

Language and Sexuality

Abstract: This lively and accessible textbook looks at how we talk about sex and why we talk about it the way we do. Drawing on a wide range of examples, from personal ads to phone sex, from sado-masochistic scenes to sexual assault trials, the book provides a clear introduction to the relationship between language and sexuality. Using a broad definition of 'sexuality', the book encompasses not only issues surrounding sexual orientation and identity but also questions about the discursive construction of sexuality and the verbal expression of erotic desire. Cameron and Kulick contextualize their findings within current research in linguistics, anthropology and psychology, and bring together relevant theoretical debates on sexuality, gender, identity, desire, meaning and power. Topical and entertaining, this much-needed textbook will be welcomed by students and researchers in sociolinguistics, linguistic anthropology and gender/sexuality studies, as well as anyone interested in the relationship between language and sex.

Electoral rules and corruption

Abstract: Is corruption systematically related to electoral rules? Recent theoretical work suggests a positive answer. But little is known about the data. We try to address this lacuna by relating corruption to different features of the electoral system in a sample of about eighty democracies in the 1990s. We exploit the cross-country variation in the data, as well as the time variation arising from recent episodes of electoral reform. The evidence is consistent with the theoretical priors. Larger voting districts— and thus lower barriers to entry— are associated with less corruption, whereas larger shares of candidates elected from party lists— and thus less individual accountability— are associated with more corruption. Individual accountability appears to be most strongly tied to personal ballots in plurality-rule elections, even though open party lists also seem to have some effect. Because different aspects roughly offset each other, a switch from strictly proportional to strictly majoritarian elections only has a small negative effect on corruption. (JEL: E62, H3)

Mobile Link Organisms and Ecosystem Functioning: Implications for Ecosystem Resilience and Management

Abstract: Current natural resource management seldom takes the ecosystem functions performed by organisms that move between systems into consideration. Organisms that actively move in the landscape and connect habitats in space and time are here termed “mobile links.” They are essential components in the dynamics of ecosystem development and ecosystem resilience (that is, buffer capacity and opportunity for reorganization) that provide ecological memory (that is, sources for reorganization after disturbance). We investigated the effects of such mobile links on ecosystem functions in aquatic as well as terrestrial environments. We identify three main functional categories: resource, genetic, and process linkers and suggest that the diversity within functional groups of mobile links is a central component of ecosystem resilience. As the planet becomes increasingly dominated by humans, the magnitude, frequency, timing, spatial extent, rate, and quality of such organism-mediated linkages are being altered. We argue that global environmental change can lead to (a) the decline of essential links in functional groups providing pollination, seed dispersal, and pest control; (b) the linking of previously disconnected areas, for example, the spread of vector-borne diseases and invasive species; and (c) the potential for existing links to become carriers of toxic substances, such as persistent organic compounds. We conclude that knowledge of interspatial exchange via mobile links needs to be incorporated into management and policy-making decisions in order to maintain ecosystem resilience and hence secure the capacity of ecosystems to supply the goods and services essential to society.

X-ray transition energies: new approach to a comprehensive evaluation

Abstract: The authors combine modern theoretical calculations with evaluated selected experimental data to produce a comprehensive data resource of K- and L-x-ray transition and absorption edge energies for all of the elements from neon to fermium. The theoretical and experimental components of this work are the result of programs of parallel development extending over more than 20 years. At each of several progressively more refined comparisons, it was possible to identify theoretical components whose systematic improvement then led to the next level of refinement in comparisons with an increasingly robust experimental reference data set. We have now reached a certain practical limit in what can be undertaken with reasonable levels of theoretical effort. This limit is not very different from the practical level of accuracy that can be meaningfully associated with the experimental data. For the more prominent diagram lines, experiment and theory are concordant with a zero-centered distribution of residuals whose statistical metrics allow the uncertainties to be estimated. For the light elements $(Zl20)$ and the very heavy elements $(Zg90)$ there are significant difficulties, as is also the case for a few isolated elements and transitions for $20lZl90.$ Overall, the results reported here represent improvements over previously available data compilations not only because of their scope but also because of their attempt to offer internal metrics of the database accuracy. The identified regions of difficulty are areas where further experimental work may be directed to see if there may remain theoretical issues that are still unresolved.

A novel anionic surfactant templating route for synthesizing mesoporous silica with unique structure

Abstract: A novel anionic surfactant templating route for synthesizing mesoporous silica with unique structure

JEM-X: The X-ray monitor aboard INTEGRAL ?

Abstract: The JEM-X monitor provides X-ray spectra and imaging with arcminute angular resolution in the 3 to 35 keV band. The good angular resolution and the low energy response of JEM-X plays an important role in the identification of gamma ray sources and in the analysis and scientific interpretation of the combined X-ray and gamma ray data. JEM-X is a coded aperture instrument consisting of two identical, coaligned telescopes. Each of the detectors has a sensitive area of 500 cm 2 , and views the sky through its own coded aperture mask. The two coded masks are inverted with respect to each other and provides an angular resolution of 3 0 across an eective field of view of about 10 diameter.

A Critique of Hofstede’s Fifth National Culture Dimension:

Abstract: Using indigenous knowledge of Chinese culture and philosophy, this article critiques Geert Hofstede’s fifth national culture dimension, i.e. ‘Confucian dynamism’, also referred to as ‘long-term orientation’. The basic premise on which the dimension is founded is scrutinized and the way in which this index has been constructed is assessed in detail. It is argued that there is a philosophical flaw inherent in this ‘new’ dimension. Given this fatal flaw and other methodological weaknesses, the usefulness of Hofstede’s fifth dimension is doubted. The article concludes by calling for new visions and perspectives in our cross cultural research.

Laboratory simulations and parameterization of the primary marine aerosol production

Abstract: A major source of the primary marine aerosol is the bursting of air bubbles produced by breaking waves. Several source parameterizations are available from the literature, usually limited to particles with a dry diameter Dp > 1 μm. The objective of this work is to extend the current knowledge to submicrometer particles. Bubbles were generated in synthetic seawater using a sintered glass filter, with a size spectra that are only partly the same spectra as measured in the field. Bubble spectra, and size distributions of the resulting aerosol (0.020-20.0 μm Dp) of the resulting aerosol, were measured for different salinity, water temperature (Tw), and bubble flux. The spectra show a minimum at ∼1 μm Dp, which separates two modes, one at ∼0.1 μm, with the largest number of particles, and one at 2.5 μm Dp. The modes show different behavior with the variation of salinity and water temperature. When the water temperature increases, the number concentration Np decreases for Dp 0.35 μm, Np increases. The salinity effect suggests different droplet formation processes for droplets smaller and larger than 0.2 μm Dp. The number of particles produced per size increment, time unit, and whitecap surface (φ) is described as a linear function of Tw and a polynomial function of Dp. Combining φ with the whitecap coverage fraction W (in percent), an expression results for the primary marine aerosol source flux dFo/dlogDp = W φ (m-2 s-1 ). The results are compared with other commonly used formulations as well as with recent field observations. Implications for aerosol-induced effects on climate are discussed.