bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spatial synchrony of recruitment in mountain‐dwelling woodland caribou
Authors: Hegel Troy M. , Verbyla David , Huettmann Falk , Barboza Perry S. 
Published: July 2011

AbstractSpatial synchrony in population dynamics is a ubiquitous feature across a range of taxa. Understanding factors influencing this synchrony may shed light on important drivers of population dynamics. Three mechanisms influence the degree of spatial synchrony between populations: dispersal, shared predators, and spatial environmental covariance (the Moran effect). We assessed demographic spatial synchrony in recruitment (calf:cow ratio) of 10 northern mountain caribou herds in the Yukon Territory, Canada (1982–2008). Shared predators and dispersal were ruled out as causal mechanisms of spatial recruitment synchrony in these herds and therefore any spatial synchrony should be due to the Moran effect. We also assessed the degree of spatial synchrony in April snow depth to represent environmental variability. The regional average spatial synchrony in detrended residuals of April snow depth was 0.46 (95% CI 0.37 to 0.55). Spatial synchrony in caribou recruitment was weak at 0.13 (95% CI −0.06 to 0.32). The spatial scale of synchrony in April snow depth and caribou recruitment was 330.2 km (95% CI 236.3 to 370.0 km) and 170.0 km (95% CI 69.5 to 282.8 km), respectively. We also investigated how the similarity in terrain features between herds influenced the degree of spatial synchrony using exponential decay models. Only the difference in elevation variability between herds during calving was supported by the data. Herds with more similar elevation variability may track snowmelt ablation patterns in a more similar fashion, which would subsequently result in more synchronized predation rates on calves and/or nutritional effects impacting juvenile survival. Interspecific interactions with predators and alternate prey may also influence spatial synchrony of recruitment in these herds.
Declining Return Migration From the United States to Mexico in the Late-2000s Recession: A Research Note
Authors: Rendall Michael S. , Brownell Peter , Kups Sarah 
Published: July 2011

AbstractResearchers in the United States and Mexico have variously asserted that return migration from the United States to Mexico increased substantially, remained unchanged, or declined slightly in response to the 2008–2009 U.S. recession and fall 2008 global financial crisis. The present study addresses this debate using microdata from 2005 through 2009 from a large-scale, quarterly Mexican household survey, the National Survey of Occupation and Employment (ENOE), after first validating the ENOE against return-migration estimates from a specialist demographic survey, the National Survey of Demographic Dynamics (ENADID). Declines in annual return-migration flows of up to a third between 2007 and 2009 were seen among the predominantly labor-migrant groups of male migrants and all 18- to 40-year-old migrants with less than a college education; and a decline in total return migration was seen in the fourth quarter of 2008 (immediately after the triggering of the global financial crisis) compared with the fourth quarter of 2007.
Representing and Reconstructing Identities in the Postwar World: Refugees, UNRRA, and Fred Zinnemann's Film,The Search(1948)
Authors: Gemie Sharif , Rees Louise 
Published: July 2011

SummaryThis article analyses Fred Zinnemann's 1948 film,The Search, setting in the context of displaced persons in post-1945 Europe. We concentrate on Zinnemann's treatment of the United Nations Relief and Rehabilitation Administration (UNRRA), arguing that this is central to the film. We also consider the film's references to Americanism, Zionism, gender equality, and children's wartime experiences.
Modelling semi-continuous data using mixture regression models with an application to cattle production yields
Authors: BELASCO E. J. , GHOSH S. K. 
Published: July 2011

SUMMARYThe present paper develops a mixture regression model that allows for distributional flexibility in modelling the likelihood of a semi-continuous outcome that takes on zero value with positive probability while continuous on the positive half of the real line. A multivariate extension is also developed that builds on past multivariate models by systematically capturing the relationship between continuous and semi-continuous variables, while allowing for the semi-continuous variable to be characterized by a mixture model. The flexibility associated with this model provides potential applications in many production system studies. The empirical model is shown to provide a more accurate measure of mortality rates in cattle feedlots, both independently and within a system including other performance and health factors.
Estonia and Antarctica
Authors: Kaup Enn , Tammiksaar Erki 
Published: July 2011

ABSTRACTThe Russian South Pole expedition carried out in 1819–1821 was an early milestone in the scientific exploration of the Antarctic. The expedition took place under the command of the Baltic German Fabian Gottlieb von Bellingshausen. Bellingshausen came from the Island of Saaremaa in Estonia. The Russian empire, and followed by the Soviet Union, did not attach much importance to Bellingshausen's expedition. It was only after World War II as the question of the Antarctic received close attention that the Bellingshausen expedition received political significance in the Soviet Union. The fact that the expedition really took place was used by the Soviet Union to claim rights to the Antarctic and also to argue for its participation in Antarctic exploration (see Tammiksaar 2007; Bulkeley 2011). In the early stages of exploration of the continent, Estonians were given the opportunity to carry out investigations there. The first Estonian research programme in the Antarctic, on noctilucent clouds, was elaborated by the astronomer Charles Villmann. Altogether some tens of Estonians have visited the southern continent performing investigations in earth sciences, atmospheric physics, hydrology and ecology of surface waters and the human influence on them. They have also carried out isotope studies of the ice sheet to reconstruct environmental conditions in the past.
James Croll: a scientist ahead of his time
Authors: Bol'shakov V.A. , Kapitsa A.P. , Rees W.G. 
Published: July 2011

ABSTRACTJames Croll (1821–1890) was a Scottish scientist who made major, although still largely unrecognised, contributions to the theory of the effects of variations in the Earth's orbit on the global climate. He was the first to identify the importance of positive feedbacks in the climate system, especially the ice-albedo feedback, and he placed the astrochronological method on a sound footing. Croll's theory was the first to predict multiple ice ages. However, it was unable to place the end of the most recent glaciation more recently than 80,000 years ago, and as evidence accumulated throughout the 19th century for a much more recent date than this Croll's theory fell into neglect. We argue that this was particularly unfortunate since several of his key ideas were forgotten, and that this has delayed the development of the orbital theory of paleoclimate.
Assessment of ASTER global digital elevation model data for Arctic research
Authors: Rees W. G. 
Published: July 2011

ABSTRACTA new source of digital elevation data, the advanced spaceborne thermal emission and reflection radiometer (ASTER) global digital elevation model (GDEM), has been freely available since 2009. It provides enormously greater coverage of the Arctic than previous satellite derived ‘global’ digital elevation models, extending to a latitude of 83 °N in contrast to 60 °N. The GDEM is described as a preliminary, research grade product. This paper investigates its accuracy in a number of specifically Arctic landscapes, including ice and snow, boreal forest, tundra and unvegetated terrain, using test sites in Svalbard, Iceland, Norway and Russia. Semivariogram analysis is used to characterise the magnitude and spatial correlation of errors in the GDEM products from the test sites. The analysis suggests that the horizontal resolution of the GDEM data is around 130 m, somewhat coarser than the sampling interval of 1 second of latitude and longitude. The vertical accuracy is variable, and the factors influencing it have not been systematically explored. However, it appears that the likely accuracy can be estimated from ‘stacking number’ data supplied with the elevation data. The stacking number is the number of independent digital elevation models averaged to generate the supplied product. Provided that this number is greater than around 6 the data have an rms accuracy of typically 5–10 m.
Multi-source synthesis of data to inform health policy
Authors: Pedersen Vibe Hjelholt , Dagenais Pierre , Lehoux Pascale 
Published: July 2011

Objectives: To propose a new method for comparing and integrating original qualitative data with systematic reviews of quantitative and qualitative studies, demonstrated by a study of the psychosocial needs of chronic fatigue syndrome (CFS) sufferers in Québec.Methods: A systematic literature review was performed across various databases for English and French language studies, on the psychosocial aspects of CFS. Qualitative, quantitative, and mixed method studies published between January 1994 and July 2008 were included. Unpublished literature and reference lists of included studies were also searched. Themes identified in the literature were used to guide semi-structured interviews with seventeen CFS-sufferers, mostly recruited from a large specialist practice in Montreal. Interviews were transcribed verbatim and validated by a research assistant. Transcripts were coded using the identified themes. New codes were created when new issues arose. All themes were subsequently synthesized into overall categories using a constant comparative method.Results: The literature search yielded thirty-one papers: twenty-eight primary studies and three systematic reviews. Twelve themes were identified and synthesized into four overall problem categories, such as “Lack of professional recognition.” Interviews confirmed findings from the literature, but also revealed unidentified needs specific to CFS-sufferers in Québec. Policy recommendations were provided to address these needs.Conclusions: Multi-Source Synthesis provides a systematic method for synthesizing data from original studies with literature findings, thereby broadening the knowledge base and the local relevance of decisions concerning specific patient populations.
Tackling ethical issues in health technology assessment: A proposed framework
Authors: Burls Amanda , Caron Lorraine , Cleret de Langavant Ghislaine , Dondorp Wybo , Harstall Christa , Pathak-Sen Ela , Hofmann Bjørn 
Published: July 2011

Objectives: Values are intrinsic to the use of health technology assessments (HTAs) in health policy, but neglecting value assumptions in HTA makes their results appear more robust or normatively neutral than may be the case. Results of a 2003 survey by the International Network of Agencies for Health Technology Assessment (INAHTA) revealed the existence of disparate methods for making values and ethical issues explicit when conducting HTA.Methods: An Ethics Working Group, with representation from sixteen agencies, was established to develop a framework for addressing ethical issues in HTA. Using an iterative approach, with email exchanges and face-to-face workshops, a report on Handling Ethical Issues was produced.Results: This study describes the development process and the agreed upon framework for reflexive ethical analysis that aims to uncover and explore the ethical implications of technologies through an integrated, context-sensitive approach and situates the proposed framework within previous work in the development of ethics analysis in HTA.Conclusions: It is important that methodological approaches to address ethical reflection in HTA be integrative and context sensitive. The question-based approach described and recommended here is meant to elicit this type of reflection in a way that can be used by HTA agencies. The questions proposed are considered only as a starting point for handling ethics issues, but their use would represent a significant improvement over much of the existing practice.
Estimating the impacts of power line collisions on Ludwig’s Bustards Neotis ludwigii
Authors: JENKINS ANDREW R. , SHAW JESSICA M. , SMALLIE JON J. , GIBBONS BRADLEY , VISAGIE RONELLE , RYAN PETER G. 
Published: July 2011

SummaryLudwig’s Bustard Neotis ludwigii, endemic to Africa’s south-west arid zone, is susceptible to collisions with overhead power lines. Limited data from the south-eastern part of its range suggest that this factor may threaten its survival. We estimated transmission line collision rates for Ludwig’s Bustard across its South African range to assess the effect of this mortality on the population. Conservatively, collision rates averaged at least 0.63 ± 0.12 fatal collisions per km of transmission line per year, with relatively little regional variation. Despite being less abundant, the larger males were more collision-prone than females, which might account for the female-biased population. Extrapolating collision rates across the range of the species suggests that 4,000–11,900 birds are killed annually on high-voltage transmission lines. Actual mortality on overhead lines is probably much greater, given biases in carcass detection (crippling, scavenging and habitat biases), as well as the fact that our estimate excludes mortality on lower voltage distribution lines and telephone wires. Given an estimated global population of 56,000–81,000 birds in the late 1980s, the demographic invariant method suggests that such mortality is unsustainable. This result supports the recent upgrading of the conservation status of Ludwig’s Bustard from ‘Least Concern’ to ‘Endangered’, and highlights the need for further research on this problem.
Exogenous Transnationalism: Java and ‘Europe’ in an Organised World Sugar Market (1927–37)
Authors: VON GRAEVENITZ FRITZ GEORG 
Published: July 2011

AbstractHistorians of the inter-war period usually view economic nationalism (in the form of protectionism) and internationalism (in the form of free trade policy) as conflicting concepts. This article argues that the transnational networks of sugar interest groups provided a new form of internationalism compatible with the policy of agricultural protectionism. By tracing the origins of the concept of international market intervention, the article also suggests a new perspective on the economic aspects of the League of Nations’ work and offers an insight into early attempts at agricultural Europeanisation.
The Cardiac Atlas Project—an imaging database for computational modeling and statistical atlases of the heart
Authors: Fonseca Carissa G. , Backhaus Michael , Bluemke David A. , Britten Randall D. , Chung Jae Do , Cowan Brett R. , Dinov Ivo D. , Finn J. Paul , Hunter Peter J. , Kadish Alan H. , Lee Daniel C. , Lima Joao A. C. , Medrano−Gracia Pau , Shivkumar Kalyanam , Suinesiaputra Avan , Tao Wenchao , Young Alistair A. 
Published: July 2011

Abstract
Motivation: Integrative mathematical and statistical models of cardiac anatomy and physiology can play a vital role in understanding cardiac disease phenotype and planning therapeutic strategies. However, the accuracy and predictive power of such models is dependent upon the breadth and depth of noninvasive imaging datasets. The Cardiac Atlas Project (CAP) has established a large-scale database of cardiac imaging examinations and associated clinical data in order to develop a shareable, web-accessible, structural and functional atlas of the normal and pathological heart for clinical, research and educational purposes. A goal of CAP is to facilitate collaborative statistical analysis of regional heart shape and wall motion and characterize cardiac function among and within population groups.
Results: Three main open-source software components were developed: (i) a database with web-interface; (ii) a modeling client for 3D + time visualization and parametric description of shape and motion; and (iii) open data formats for semantic characterization of models and annotations. The database was implemented using a three-tier architecture utilizing MySQL, JBoss and Dcm4chee, in compliance with the DICOM standard to provide compatibility with existing clinical networks and devices. Parts of Dcm4chee were extended to access image specific attributes as search parameters. To date, approximately 3000 de-identified cardiac imaging examinations are available in the database. All software components developed by the CAP are open source and are freely available under the Mozilla Public License Version 1.1 (http://www.mozilla.org/MPL/MPL-1.1.txt).
Availability: http://www.cardiacatlas.org
Contact: a.young@auckland.ac.nz
Supplementary information: Supplementary data are available at Bioinformatics online.
APCluster: an R package for affinity propagation clustering
Authors: Bodenhofer Ulrich , Kothmeier Andreas , Hochreiter Sepp 
Published: July 2011

Abstract
Summary: Affinity propagation (AP) clustering has recently gained increasing popularity in bioinformatics. AP clustering has the advantage that it allows for determining typical cluster members, the so-called exemplars. We provide an R implementation of this promising new clustering technique to account for the ubiquity of R in bioinformatics. This article introduces the package and presents an application from structural biology.
Availability: The R package apcluster is available via CRAN—The Comprehensive R Archive Network: http://cran.r-project.org/web/packages/apcluster
Contact: apcluster@bioinf.jku.at; bodenhofer@bioinf.jku.at
Simulating systems genetics data with SysGenSIM
Authors: Pinna Andrea , Soranzo Nicola , Hoeschele Ina , de la Fuente Alberto 
Published: July 2011

AbstractSummary: SysGenSIM is a software package to simulate Systems Genetics (SG) experiments in model organisms, for the purpose of evaluating and comparing statistical and computational methods and their implementations for analyses of SG data [e.g. methods for expression quantitative trait loci (eQTL) mapping and network inference]. SysGenSIM allows the user to select a variety of network topologies, genetic and kinetic parameters to simulate SG data ( genotyping, gene expression and phenotyping) with large gene networks with thousands of nodes. The software is encoded in MATLAB, and a user-friendly graphical user interface is provided.Availability: The open-source software code and user manual can be downloaded at: http://sysgensim.sourceforge.net/Contact: alf@crs4.it
High‐resolution and super stacking of time‐reversal mirrors in locating seismic sources
Authors: Cao W. , Hanafy S. M. , Schuster G. T. , Zhan G. , Boonyasiriwat C. 
Published: July 2011

ABSTRACTTime reversal mirrors can be used to backpropagate and refocus incident wavefields to their actual source location, with the subsequent benefits of imaging with high‐resolution and super‐stacking properties. These benefits of time reversal mirrors have been previously verified with computer simulations and laboratory experiments but not with exploration‐scale seismic data. We now demonstrate the high‐resolution and the super‐stacking properties in locating seismic sources with field seismic data that include multiple scattering. Tests on both synthetic data and field data show that a time reversal mirror has the potential to exceed the Rayleigh resolution limit by factors of 4 or more. Results also show that a time reversal mirror has a significant resilience to strong Gaussian noise and that accurate imaging of source locations from passive seismic data can be accomplished with traces having signal‐to‐noise ratios as low as 0.001. Synthetic tests also demonstrate that time reversal mirrors can sometimes enhance the signal by a factor proportional to the square root of the product of the number of traces, denoted as N and the number of events in the traces. This enhancement property is denoted as super‐stacking and greatly exceeds the classical signal‐to‐noise enhancement factor of . High‐resolution and super‐stacking are properties also enjoyed by seismic interferometry and reverse‐time migration with the exact velocity model.
Gravity field and tectonic features of Block L2 in the Lamu basin, Kenya
Authors: Yuan Bingqiang , Xie Wensheng , Liu Guihe , Zhang Chunguan 
Published: July 2011

ABSTRACTA gravity survey on the scale of 1: 250 000 was carried out in Block L2 located in the Lamu basin of south‐east Kenya in order to study tectonic features and find out favourable petroleum prospects in the block. This paper, through data processing and synthetic interpretation of the measured gravity data in the block, discusses characteristics of the gravity field and their geological implications, determines the fault system and the basement depth, analyses features of the main strata, divides structure units and predicts favourable petroleum zones. In the block, the regional gravity anomaly is mainly caused by the inclined Moho surface that rises in the east and subsides in the west topographically and the Bouguer gravity anomaly primarily reflects the superimposition of the gravity effect derived from the Moho surface and the basement relief. Two groups of faults extending NW (NWW) and NE (NEE) respectively are dominant in the block and their activities resulted in the framework of east‐west zoning and south‐north blocking. The basement depth greatly changes in an alternative high and low pattern. The Permian‐Triassic, Jurassic and Tertiary strata are extensively developed, while the Cretaceous is only developed in the east of the block. Structurally, the block can be divided into five units, of which the Tana sag shows excellent source‐reservoir‐seal associations and is a favourable target for future petroleum exploration.