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Research data keyboard_double_arrow_right Dataset 2019Embargo end date: 05 Feb 2022Publisher:Zenodo Authors:Aguirre Gutierrez, Jesus;
Malhi, Yadvinder;Aguirre Gutierrez, Jesus
Aguirre Gutierrez, Jesus in OpenAIREMaps created and resulting data from analysis in changes in community weighted mean of traits. The raw trait data and forest census data used are available from their sources in www.gem.tropicalforests.ox.ac.uk and ForestPlots.net.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2022Embargo end date: 30 Jan 2022Publisher:Dryad Authors:Barreaux, Antoine;
Barreaux, Antoine
Barreaux, Antoine in OpenAIREHigginson, Andrew;
Higginson, Andrew
Higginson, Andrew in OpenAIREBonsall, Michael;
English, Sinead;Bonsall, Michael
Bonsall, Michael in OpenAIREHere, we investigate how stochasticity and age-dependence in energy dynamics influence maternal allocation in iteroparous females. We develop a state-dependent model to calculate the optimal maternal allocation strategy with respect to maternal age and energy reserves, focusing on allocation in a single offspring at a time. We introduce stochasticity in energetic costs– in terms of the amount of energy required to forage successfully and individual differences in metabolism – and in feeding success. We systematically assess how allocation is influenced by age-dependence in energetic costs, feeding success, energy intake per successful feeding attempt, and environmentally-driven mortality. First, using stochastic dynamic programming, we calculate the optimal amount of reserves M that mothers allocate to each offspring depending on their own reserves R and age A. The optimal life history strategy is then the set of allocation decisions M(R, A) over the whole lifespan which maximizes the total reproductive success of distant descendants. Second, we simulated the life histories of 1000 mothers following the optimisation strategy and the reserves at the start of adulthood R1, the distribution of which was determined, the distribution of which was determined using an iterative procedure as described . For each individual, we calculated maternal allocation Mt, maternal reserves Rt, and relative allocation Mt⁄Rt at each time period t. The relative allocation helps us to understand how resources are partitioned between mother and offspring. Third, we consider how the optimal strategy varies when there is age-dependence in resource acquisition, energetic costs and survival. Specifically, we include varying scenarios with an age-dependent increase or a decrease with age in energetic costs (c_t), feeding success (q_t), energy intake per successful feeding attempt (y_t), and environmentally-driven extrinsic mortality rate (d_t) (Table 2). We consider the age-dependence of parameters one at a time or in pairs, altering the slope, intercept, or asymptote of the age-dependence (linear or asymptotic function). Our aim is to identify whether the observed reproductive senescence can arise from optimal maternal allocation. As such, we do not impose a decline in selection in later life as all offspring are equally valuable at all ages (for a given maternal allocation), and there are no mutations. For each scenario, we run the backward iteration process with these age-dependent functions, obtain the allocation strategy, and simulate the life history of 1000 individuals based on the novel strategy. We then fit quadratic and linear models to the reproduction of these 1000 individuals using the lme function, nlme package in R. For these models, the response variable is the maternal allocation Mt and explanatory variables are the time period t and t2 (for the quadratic fit only), with individual identity as a random term. We use likelihood ratio tests to compare linear and quadratic models using the anova function (package nlme) with the maximum-likelihood method. If the comparison is significant (p-value <0.05), we considered the quadratic model to have a better fit, otherwise the linear model is considered more parsimonious. We were particularly interested in identifying scenarios where the fit was quadratic with a negative quadratic term. For each scenario, the pseudo R2 conditional value (proportion of variance explained by the fixed and random terms, accounting for individual identity) is calculated to assess the goodness-of-fit of the lme model, on a scale from 0 to 1, using the “r.squared” function, package gabtool. All calculations and coding are done in R. Iteroparous parents face a trade-off between allocating current resources to reproduction versus maximizing survival to produce further offspring. Optimal allocation varies across age, and follows a hump-shaped pattern across diverse taxa, including mammals, birds and invertebrates. This non-linear allocation pattern lacks a general theoretical explanation, potentially because most studies focus on offspring number rather than quality and do not incorporate uncertainty or age-dependence in energy intake or costs. Here, we develop a life history model of maternal allocation in iteroparous animals. We identify the optimal allocation strategy in response to stochasticity when energetic costs, feeding success, energy intake, and environmentally-driven mortality risk are age-dependent. As a case study, we use tsetse, a viviparous insect that produces one offspring per reproductive attempt and relies on an uncertain food supply of vertebrate blood. Diverse scenarios generate a hump-shaped allocation: when energetic costs and energy intake increase with age; and also when energy intake decreases, and energetic costs increase or decrease. Feeding success and mortality risk have little influence on age-dependence in allocation. We conclude that ubiquitous evidence for age-dependence in these influential traits can explain the prevalence of non-linear maternal allocation across diverse taxonomic groups.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2021Publisher:NERC EDS Environmental Information Data Centre Authors:O’Gorman, E.J.;
O’Gorman, E.J.
O’Gorman, E.J. in OpenAIREWarner, E.;
Warner, E.
Warner, E. in OpenAIREMarteinsdóttir, B.;
Helmutsdóttir, V.F.; +2 AuthorsMarteinsdóttir, B.
Marteinsdóttir, B. in OpenAIREO’Gorman, E.J.;
O’Gorman, E.J.
O’Gorman, E.J. in OpenAIREWarner, E.;
Warner, E.
Warner, E. in OpenAIREMarteinsdóttir, B.;
Helmutsdóttir, V.F.;Marteinsdóttir, B.
Marteinsdóttir, B. in OpenAIREEhrlén, J.;
Ehrlén, J.
Ehrlén, J. in OpenAIRERobinson, S.I.;
Robinson, S.I.
Robinson, S.I. in OpenAIREHerbivory assessments were made at the plant community and species levels. We focused on three plant species with a widespread occurrence across the temperature gradient: cuckooflower (Cardamine pratensis, Linnaeus), common mouse-ear (Cerastium fontanum, Baumgerten), and marsh violet (Viola palustris, Linnaeus). For assessments of invertebrate herbivory at the species level, thirty individuals per species of C. pratensis, C. fontanum, and V. palustris were marked in each of ten plots, using a stratified random sampling method where individuals were randomly selected, but the full range of within-plot soil temperatures was represented. For assessments of invertebrate herbivory at the community level, five 50 × 50 cm quadrats were marked at random points in eight of the plots that best captured the full temperature gradient. The community-level herbivory assessment was conducted on 19th June. The number of damaged plants was recorded out of 100 random individuals, selected using a 10 × 10 grid within each 50 × 50 cm quadrat. For the species-level herbivory assessment, individual marked plants were surveyed for signs of invertebrate herbivory every two weeks from 30th May to 2nd July, generating three time-points per species. At each survey, all marked individuals for each species were assessed within a 48-hour period. Plants were recorded as damaged or not damaged by invertebrate herbivores at each time-point. Further details of how phenological stage of development, vegetation community composition, soil temperature, moisture, pH, nitrate, ammonium, and phosphate were recorded are provided in the supporting documentation. This is a dataset of environmental data, vegetation cover, and community- and species-level invertebrate herbivory, sampled at 14 experimental soil plots in the Hengill geothermal valley, Iceland, from May to July 2017. The plots span a temperature gradient of 5-35 °C on average over the sampling period, yet they occur within 1 km of each other and have similar soil moisture, pH, nitrate, ammonium, and phosphate.
https://dx.doi.org/1... arrow_drop_down add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2023Embargo end date: 11 Oct 2023Publisher:Dryad Authors:Ding, Fangyu;
Ge, Honghan; Ma, Tian; Wang, Qian; +8 AuthorsDing, Fangyu
Ding, Fangyu in OpenAIREDing, Fangyu;
Ge, Honghan; Ma, Tian; Wang, Qian; Hao, Mengmeng; Li, Hao; Zhang, Xiao-Ai; Maude, Richard James; Wang, Liping; Jiang, Dong; Fang, Li-Qun; Liu, Wei;Ding, Fangyu
Ding, Fangyu in OpenAIRE# Data on: Projecting spatiotemporal dynamics of severe fever with thrombocytopenia syndrome in the mainland of China [https://doi.org/10.5061/dryad.vdncjsz1z](https://doi.org/10.5061/dryad.vdncjsz1z) This dataset is the data used in the paper of Global change biology entitled "Projecting spatiotemporal dynamics of severe fever with thrombocytopenia syndrome in the mainland of China". We use an integrated multi-model, multi-scenario framework to assess the impact of global climate change on SFTS disease in the mainland of China. ## Description of the data and file structure The predicted annual incidence of national SFTS cases with or without human population reduction under four RCPs under different climate change scenarios (RCP2.6, RCP4.5, RCP6.0, and RCP8.5) in the 2030s, 2050s, and 2080s. The value represents the annual incidence, and the unit is 105/year. The Dataset-1 file includes the predicted annual incidence of national SFTS cases with a fixed future human population under different climate change scenarios (RCP2.6, RCP4.5, RCP6.0, and RCP8.5) in the 2030s, 2050s, and 2080s. The Dataset-2 file includes the predicted annual incidence of national SFTS cases in the 2030s, 2050s, and 2080s with human population reduction (SSP2) under four RCPs. ## Sharing/Access information Data was derived from the following sources: * https://doi.org/10.1111/gcb.16969 This dataset is the data used in the paper of Global change biology entitled "Projecting spatiotemporal dynamics of severe fever with thrombocytopenia syndrome in the mainland of China". We use an integrated multi-model, multi-scenario framework to assess the impact of global climate change on SFTS disease in the mainland of China. The SFTS incidence in three time periods (2030-2039, 2050-2059, 2080-2089) is predicted to be increased as compared to the 2010s in the context of various RCPs. The projected spatiotemporal dynamics of SFTS will be heterogeneous across provinces. Notably, we predict possible outbreaks in Xinjiang and Yunnan in the future, where only sporadic cases have been reported previously. These findings highlight the need for population awareness of SFTS in endemic regions, and enhanced monitoring in potential risk areas. See the Materials and methods section in the original paper. The code used in the statistical analyses are present in the paper and/or the Supplementary Materials.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2023Publisher:World Data Center for Climate (WDCC) at DKRZ Authors:Neubauer, David;
Neubauer, David
Neubauer, David in OpenAIREFerrachat, Sylvaine;
Siegenthaler-Le Drian, Colombe; Stoll, Jens; +18 AuthorsFerrachat, Sylvaine
Ferrachat, Sylvaine in OpenAIRENeubauer, David;
Neubauer, David
Neubauer, David in OpenAIREFerrachat, Sylvaine;
Siegenthaler-Le Drian, Colombe; Stoll, Jens; Folini, Doris Sylvia;Ferrachat, Sylvaine
Ferrachat, Sylvaine in OpenAIRETegen, Ina;
Tegen, Ina
Tegen, Ina in OpenAIREWieners, Karl-Hermann;
Wieners, Karl-Hermann
Wieners, Karl-Hermann in OpenAIREMauritsen, Thorsten;
Stemmler, Irene; Barthel, Stefan; Bey, Isabelle;Mauritsen, Thorsten
Mauritsen, Thorsten in OpenAIREDaskalakis, Nikos;
Heinold, Bernd;Daskalakis, Nikos
Daskalakis, Nikos in OpenAIREKokkola, Harri;
Kokkola, Harri
Kokkola, Harri in OpenAIREPartridge, Daniel;
Rast, Sebastian; Schmidt, Hauke;Partridge, Daniel
Partridge, Daniel in OpenAIRESchutgens, Nick;
Stanelle, Tanja;Schutgens, Nick
Schutgens, Nick in OpenAIREStier, Philip;
Stier, Philip
Stier, Philip in OpenAIREWatson-Parris, Duncan;
Watson-Parris, Duncan
Watson-Parris, Duncan in OpenAIRELohmann, Ulrike;
Lohmann, Ulrike
Lohmann, Ulrike in OpenAIREProject: Coupled Model Intercomparison Project Phase 6 (CMIP6) datasets - These data have been generated as part of the internationally-coordinated Coupled Model Intercomparison Project Phase 6 (CMIP6; see also GMD Special Issue: http://www.geosci-model-dev.net/special_issue590.html). The simulation data provides a basis for climate research designed to answer fundamental science questions and serves as resource for authors of the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC-AR6). CMIP6 is a project coordinated by the Working Group on Coupled Modelling (WGCM) as part of the World Climate Research Programme (WCRP). Phase 6 builds on previous phases executed under the leadership of the Program for Climate Model Diagnosis and Intercomparison (PCMDI) and relies on the Earth System Grid Federation (ESGF) and the Centre for Environmental Data Analysis (CEDA) along with numerous related activities for implementation. The original data is hosted and partially replicated on a federated collection of data nodes, and most of the data relied on by the IPCC is being archived for long-term preservation at the IPCC Data Distribution Centre (IPCC DDC) hosted by the German Climate Computing Center (DKRZ). The project includes simulations from about 120 global climate models and around 45 institutions and organizations worldwide. Summary: These data include the subset used by IPCC AR6 WGI authors of the datasets originally published in ESGF for 'CMIP6.AerChemMIP.HAMMOZ-Consortium.MPI-ESM-1-2-HAM' with the full Data Reference Syntax following the template 'mip_era.activity_id.institution_id.source_id.experiment_id.member_id.table_id.variable_id.grid_label.version'. The MPI-ESM1.2-HAM climate model, released in 2017, includes the following components: aerosol: HAM2.3, atmos: ECHAM6.3 (spectral T63; 192 x 96 longitude/latitude; 47 levels; top level 0.01 hPa), atmosChem: sulfur chemistry (unnamed), land: JSBACH 3.20, ocean: MPIOM1.63 (bipolar GR1.5, approximately 1.5deg; 256 x 220 longitude/latitude; 40 levels; top grid cell 0-12 m), ocnBgchem: HAMOCC6, seaIce: unnamed (thermodynamic (Semtner zero-layer) dynamic (Hibler 79) sea ice model). The model was run by the ETH Zurich, Switzerland; Max Planck Institut fur Meteorologie, Germany; Forschungszentrum Julich, Germany; University of Oxford, UK; Finnish Meteorological Institute, Finland; Leibniz Institute for Tropospheric Research, Germany; Center for Climate Systems Modeling (C2SM) at ETH Zurich, Switzerland (HAMMOZ-Consortium) in native nominal resolutions: aerosol: 250 km, atmos: 250 km, atmosChem: 250 km, land: 250 km, ocean: 250 km, ocnBgchem: 250 km, seaIce: 250 km.
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2024Embargo end date: 01 Aug 2024Publisher:Dryad Authors:Malanoski, Cooper;
Malanoski, Cooper
Malanoski, Cooper in OpenAIRELunt, Daniel;
Lunt, Daniel
Lunt, Daniel in OpenAIREFarnsworth, Alex;
Farnsworth, Alex
Farnsworth, Alex in OpenAIREValdes, Paul;
+1 AuthorsValdes, Paul
Valdes, Paul in OpenAIREMalanoski, Cooper;
Malanoski, Cooper
Malanoski, Cooper in OpenAIRELunt, Daniel;
Lunt, Daniel
Lunt, Daniel in OpenAIREFarnsworth, Alex;
Farnsworth, Alex
Farnsworth, Alex in OpenAIREValdes, Paul;
Valdes, Paul
Valdes, Paul in OpenAIRESaupe, Erin;
Saupe, Erin
Saupe, Erin in OpenAIREThis README file was generated on [25/02/2024] by [Cooper Malanoski]. GENERAL INFORMATION 1. Title of Dataset: Climate change is an important predictor of extinction risk on macroevolutionary timescales 2. Author Information A. Principal Investigator Contact Information Name: [Cooper Malanoski] Institution: [Oxford University] Address: [Department of Earth Sciences, Oxford University, South Parks Road, Oxford, OX1 3AN, UK.] Email: [] B. Associate or Co-investigator Contact Information Name: [Dr. Erin Saupe] Institution: [Oxford University] Address: [1Department of Earth Sciences, Oxford University, South Parks Road, Oxford, OX1 3AN, UK.] Email: [] 3. Date of data collection: [NA] 4. Geographic location of data collection: [NA] 5. Information about funding sources: [National science research council (NERC), Award: NE/V011405/1 Leverhulme Prize Chinese Academy of Sciences Visiting Professorship for Senior International Scientists, Award: 2021FSE0001] SHARING/ACCESS INFORMATION 1. Licenses/restrictions placed on the data: [Copyright © 2024 the authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original US government works. reuse] 2. Links to publications that cite or use the data: Malanoski et al. (2024). [Climate change is an important predictor of extinction risk on macroevolutionary timescales]. [Science]. 3. Links to other publicly accessible locations of the data: [NA] 4. Links/relationships to ancillary data sets: [Monarrez et al. (2021) was used to source the Generic_bodysize_data_monarrezetal2021.csv file] 5. Was data derived from another source? [Yes] A. If yes, list source(s): [Monarrez et al. (2021) was used to source the Generic_bodysize_data_monarrezetal2021.csv file] 6. Recommended citation for this dataset: Malanoski et al. (2024). Data from: Climate change is an important predictor of extinction risk on macroevolutionary timescales. Dryad Digital Repository. [doi:10.5061/dryad.1ns1rn91g] DATA & FILE OVERVIEW 1. File List: A) pbdbdata_code.Rmd B) Generic_bodysize_data_monarrezetal2021.csv C) raw_extracted_climatemodeldata.csv D) Geographic_range_code.Rmd E) Climate_based_variable_code.Rmd F) figures_code.Rmd G) intrinsic_and_extrinsic_variables.csv 2. Relationship between files: The utility of each dataset and code file is detailed below. 3. Additional related data collected that was not included in the current data package: [NA] 4. Are there multiple versions of the dataset? [No] A. If yes, name of file(s) that was updated: [NA] i. Why was the file updated? [NA] ii. When was the file updated? [NA] DATA-SPECIFIC INFORMATION \######################################################################### DATA-SPECIFIC INFORMATION FOR: Generic_bodysize_data_monarrezetal2021.csv includes the genera, log body volume and log body size estimates provided in Monarrez et al. (2021). For our analyses we use logvol, but logsize is retained for future studies. We removed bony fish from the original dataset, and the reasoning is provided in the Supplementary methods and materials. We join the log volume with our data based on the genus level. Higher taxonomic ranking revisions which Monarrez et al. (2021) revised were applied to our data using code found in Geographic_range_code.Rmd. 1. Number of variables: 7 2. Number of cases/rows: 9,461 3. Variable List: * genus: all invertebrate genera with body size information in Monarrez et al. (2021), except for Bony fish genera. * class: Linnean Class * logsize: log body size data from Monarrez et al. (2021) calculated from the treatise images in mm-squared. * logvol: log body volume data from Monarrez et al. (2021) calculated from the treatise images in mm-cubed. * phylum: Linnean Phylum * order: Linnean Order * family: Linnean Family 4. Missing data: Some Na's are present if a higher taxonomic ranking was not available for a genus. 5. Specialized formats or other abbreviations used: None \######################################################################### DATA-SPECIFIC INFORMATION FOR: raw_extracted_climatemodeldata.csv 1. Number of variables: 12 2. Number of cases/rows: 462,855 3. Variable List: * collection_no: Collection number of occurrence in the PBDB * stage: Geologic stage * Age: Age in millions of years before present * phylum: Linnean phylum * class: Linnean class * order: linnean order * family: linnean family * genus: linnean genus * paleolng: Paleolatitude coordinates * paleolat: Paleolongitude coordinates * Localized temperature: The temperature extracted for each occurrence in degrees Celsius * Localized change in temperature: Change in temperature between stages for each occurrence in degrees Celsius. 4. Missing data codes: Some Na's are present if a higher taxonomic ranking was not available for a genus. 5. Specialized formats or other abbreviations used: None \######################################################################### DATA-SPECIFIC INFORMATION FOR: intrinsic_and_extrinsic_variables.csv includes the climate model data for each occurrence in the PBDB data that can be sourced from pbdbdata_code.Rmd. This includes the localized temperatures and climate change estimates necessary to carry out future studies, and all analyses in Malanoski et al. (2024) 1. Number of variables: 17 2. Number of cases/rows: 22,222 3. Variable List: * ext: Binary extinction variable based on range through methods. A value of 0 indicates that the genus survived into subsequent stages and 1 indicates that the genus went extinct and is absent from subsequent stages. * Genus: Linnean genus * Stage: Geologic stage * Phylum: Linnean phylum * Class: Linnean class * Order: Linnean order * Family: Linnean family * Realized_thermal_niche_breadth: Realized thermal niche breadth calculated as the difference between the maximum and minimum occuppied temperatures for each genus. This variable is based on the median of all subsampled ranges for a genus. * Absolute_realized_thermal_preference: Realized thermal preference is calculated as the absolute value of the deviation in median occuppied temperature for a genus from the median for all occurrences within a stage. This variable is based on the median of all subsampled preferences for a genus. * Geographic_range_size: Geographic range size is calculated using the log convex hull area (km-squared). This variable is based on the median of all subsampled areas for a genus. * Body_size: Body size is calculated as the log body volume (mm-cubed) for each genus, derived from Monarrez et al. (2021). * Absolute_temperature_change: Change in temperature or climate change is calculated as the absolute change in temperature from stage n to n+1. This variable is based on the median of all subsampled ranges for a genus. * Realized_thermal_niche_breadth_std: Standardized realized thermal niche breadth * Realized_thermal_preference_std: Standardized realized thermal preference * Geographic_range_size_std: Standardized geographic range size * Body_size_std: Standardized body size * Absolute_temperature_change_std: Standardized absolute temperature change 4. Missing data codes: NA (data not applicable). Higher taxonomic levels may contain NA values if there are none applicable for a genus. 5. Specialized formats or other abbreviations used: \######################################################################### DATA-SPECIFIC INFORMATION FOR: pbdbdata_code.Rmd pbdbdata_code.Rmd is based on Kocsis et al. (2019) it can be used to download a dataset from the Paleobiology database (PBDB), and process and clean the data using the methods used in this manuscript. The code filters out occurrences which cannot be assigned to a stage and assigns up to date stages, filters out taxa which are not included in Generic_bodysize_data_monarrezetal2021.csv, and vets the occurrences for spatial duplicates and data without coordinates. \######################################################################### DATA-SPECIFIC INFORMATION FOR: Geographic_range_code.Rmd and Climate_based_variable_code.Rmd Geographic_range_code.Rmd and Climate_based_variable_code.Rmd are used to calculate geographic range size, absolute realized thermal preference, realized thermal niche breadth, and absolute change in occupied temperature. These R-markdown files rely on the raw_extracted_climatemodeldata.csv file and We provide code to calculate these variables for both jackknife and bootstrap subsampling methods. The geographic range code is adapted from Casey et al. (2021). The output from these files is provided as intrinsic_and_extrinsic_variables.csv and is used as the input for our statistical models, which can be made using figures_code.Rmd. \######################################################################### DATA-SPECIFIC INFORMATION FOR: figures_code.Rmd figures_code.Rmd can be used and modified to reproduce the main text and supplementary tables and figures. The code initially runs all model combinations for our 5 predictors using a generalized linear mixed effect model. Then we use the output from the best model total.glmer2 to make the marginal effects plots seen in figure 2, the supplementary conditional mode plots, and the AIC tables seen in the supplemental materials and methods. Lastly, we provide the code to produce figure 1. \######################################################################### Anthropogenic climate change is increasing rapidly and already impacting biodiversity. Despite the importance for future projections, understanding of the underlying mechanisms by which climate mediates extinction remains limited. We present an integrated approach examining the role of intrinsic traits vs. extrinsic climate change in mediating extinction risk for marine invertebrates over the past 485 million years. We found that a combination of physiological traits and the magnitude of climate change are necessary to explain marine invertebrate extinction patterns. Our results suggest that taxa previously identified as extinction resistant may still succumb to extinction if the magnitude of climate change is great enough.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2019Publisher:ASME International doi: 10.1115/1.4044834
Abstract Transient thermal behaviors of ultra-supercritical steam turbine control valves during the cold start warm-up process of steam turbine systems were comprehensively studied using conjugate heat transfer (CHT) simulation. The geometrical configurations and boundary conditions used in simulation were identical to the field setup in a thermal power plant. The simulated temperature variations were first validated using measurements by the flush-mounted thermocouples inside the solid valve bodies. The CHT simulation implementing the shear stress transport (SST) turbulence model demonstrated good agreement with the field data, and the overall numerical errors were below 10%; however, the numerical errors of the simulation, which used empirical heat transfer coefficients at the fluid–solid interfaces, reached 40%. The determined temperature differences between the cold valve bodies with the hot steam flow decreased significantly. Specifically, the temperature differences along the inner wall surfaces of the valve bodies decreased to less than 50 °C. Further investigation of the transient heat flux distributions and Nusselt number distributions confirmed that the unsteady flow behaviors, such as the alternating oscillations of the annular wall-attached jet, the central reverse flow and the intermediate shear layer instabilities, enhanced the fluid–solid heat convection process and thus contributed to the warming up of the solid valve bodies.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 6 citations 6 popularity Top 10% influence Average impulse Average Powered by BIP!
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Article , Journal 2008 United KingdomPublisher:ASMEDC Authors: Wang, DX; He, L;The adjoint method for blade design optimization will be described in this two-part paper. The main objective is to develop the capability of carrying out aerodynamic blading shape design optimization in a multi-stage turbomachinery environment. To this end, an adjoint mixing-plane treatment has been proposed. In the first part, the numerical elements pertinent to the present approach will be described. The gradients of a single objective function of a weighted sum of objectives and constraints with respect to detailed blade shape perturbations are obtained very efficiently by the continuous adjoint method. The steepest descent method is used to drive the design to an optimum. The adjoint mixing-plane treatment enables the adjoint equations to be solved in a multi-stage environment. The adjoint solver is verified by comparing gradient results with a direct finite difference method and through a 2D inverse design. The adjoint mixing-plane treatment is verified by comparing gradient results against those by the finite difference method for a 2D compressor stage. The redesign of the 2D compressor stage further demonstrates the validity of the adjoint mixing-plane treatment and the benefit of using it in a multi-bladerow environment.
https://doi.org/10.1... arrow_drop_down Oxford University Research ArchiveConference object . 2008Data sources: Oxford University Research Archiveadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 78 citations 78 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
visibility 1visibility views 1 Powered bymore_vert https://doi.org/10.1... arrow_drop_down Oxford University Research ArchiveConference object . 2008Data sources: Oxford University Research Archiveadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2013 United KingdomPublisher:Springer Science and Business Media LLC Funded by:UKRI | Designer Catalysts for Hi..., UKRI | Designer Catalysts for Hi...UKRI| Designer Catalysts for High Efficiency Biodiesel Production ,UKRI| Designer Catalysts for High Efficiency Biodiesel ProductionAuthors:Martinez Hernandez, E;
Martinez Hernandez, E
Martinez Hernandez, E in OpenAIRESADHUKHAN, J;
Campbell, GM;SADHUKHAN, J
SADHUKHAN, J in OpenAIREMartinez-Herrera, J;
Martinez-Herrera, J
Martinez-Herrera, J in OpenAIREDriven by the need to develop a wide variety of products with low environmental impact, biorefineries need to emerge as highly integrated facilities. This becomes effective when overall mass and energy integration through a centralised utility system design is undertaken. An approach combining process integration, energy and greenhouse gas (GHG) emission analyses is shown in this paper for Jatropha biorefinery design, primarily producing biodiesel using oil-based heterogeneously catalysed transesterification or green diesel using hydrotreatment. These processes are coupled with gasification of husk to produce syngas. Syngas is converted into end products, heat, power and methanol in the biodiesel case or hydrogen in the green diesel case. Anaerobic digestion of Jatropha by-products such as fruit shell, cake and/or glycerol has been considered to produce biogas for power generation. Combustion of fruit shell and cake is considered to provide heat. Heat recovery within biodiesel or green diesel production and the design of the utility (heat and power) system are also shown. The biorefinery systems wherein cake supplies heat for oil extraction and seed drying while fruit shells and glycerol provide power generation via anaerobic digestion into biogas achieve energy efficiency of 53 % in the biodiesel system and 57 % in the green diesel system. These values are based on high heating values (HHV) of Jatropha feedstocks, HHV of the corresponding products and excess power generated. Results showed that both systems exhibit an energy yield per unit of land of 83 GJ ha−1. The global warming potential from GHG emissions of the net energy produced (i.e. after covering energy requirements by the biorefinery systems) was 29 g CO2-eq MJ−1, before accounting credits from displacement of fossil-based energy by bioenergy exported from the biorefineries. Using a systematic integration approach for utilisation of whole Jatropha fruit, it is shown that global warming potential and fossil primary energy use can be reduced significantly if the integrated process schemes combined with optimised cultivation and process parameters are adopted in Jatropha-based biorefineries.
Biomass Conversion a... arrow_drop_down Biomass Conversion and BiorefineryArticle . 2013 . Peer-reviewedLicense: Springer TDMData sources: CrossrefBiomass Conversion and BiorefineryArticle . 2014 . Peer-reviewedData sources: Oxford University Research ArchiveUniversity of Surrey, Guildford: Surrey Scholarship Online.Article . 2014Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 40 citations 40 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
download 72download downloads 72 Powered bymore_vert Biomass Conversion a... arrow_drop_down Biomass Conversion and BiorefineryArticle . 2013 . Peer-reviewedLicense: Springer TDMData sources: CrossrefBiomass Conversion and BiorefineryArticle . 2014 . Peer-reviewedData sources: Oxford University Research ArchiveUniversity of Surrey, Guildford: Surrey Scholarship Online.Article . 2014Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euResearch data keyboard_double_arrow_right Dataset 2024Publisher:Zenodo Authors:Zezhong Zhang;
Ivan Lobato; Hamish Brown;Zezhong Zhang
Zezhong Zhang in OpenAIRELamoen, Dirk;
+4 AuthorsLamoen, Dirk
Lamoen, Dirk in OpenAIREZezhong Zhang;
Ivan Lobato; Hamish Brown;Zezhong Zhang
Zezhong Zhang in OpenAIRELamoen, Dirk;
Daen Jannis; Johan Verbeeck; Sandra Van Aert; Peter Nellist;Lamoen, Dirk
Lamoen, Dirk in OpenAIREThe rich information of electron energy-loss spectroscopy (EELS) comes from the complex inelastic scattering process whereby fast electrons transfer energy and momentum to atoms, exciting bound electrons from their ground states to higher unoccupied states. To quantify EELS, the common practice is to compare the cross-sections integrated within an energy window or fit the observed spectrum with theoretical differential cross-sections calculated from a generalized oscillator strength (GOS) database with experimental parameters [1]. The previous Hartree-Fock-based [2] or DFT-based [3] GOS was calculated from Schrödinger's solution of atomic orbitals, which does not include the full relativistic effects. Here, we attempt to go beyond the limitations of the Schrödinger solution in the GOS tabulation by including the full relativistic effects using the Dirac equation within the local density approximation using FAC [4], which is particularly important for core-shell electrons of heavy elements with strong spin-orbit coupling. This has been done for all elements in the periodic table (up to Z = 118) for all possible excitation edges using modern computing capabilities and parallelization algorithms. The relativistic effects of fast incoming electrons were included to calculate cross-sections that are specific to the acceleration voltage. We make these tabulated GOS available under an open-source license to the benefit of both academic users as well as allowing integration into commercial solutions. If you wish to be notfied by the database updates, please register here. For details, you can find the paper on arxiv. Database Details: Covers all elements (Z: 1-108) and all edges Large energy range: 0.01 - 4000 eV Large momentum range: from minimum momentum transfer to double Bethe ridge for each edge. Adaptive momentum sampling is developed in such a manner to maximize the physical information for a given finite number of sampling points. For example, for C edge this range is 0.14 -67 Å-1 Fine log sampling: 128 points for energy and 256 points for momentum Data format: GOSH [3] Calculation Details: Single atoms only; solid-state effects are not considered Unoccupied states before continuum states of ionization are not considered; no fine structure Plane Wave Born Approximation Frozen Core Approximation is employed; electrostatic potential remains unchanged for orthogonal states when a core-shell electron is excited Self-consistent Dirac–Fock–Slater iteration is used for Dirac calculations; A modified local density approximation is used for the correct asymptotic behavior of the exchange energy; continuum states are normalized against asymptotic form at large distances Both large and small component contributions of Dirac solutions are included in GOS Final state contributions are included until the contribution of the last states falls below 0.1%. A convergence log is provided for reference. Version 1.6.5 release note: Add a compact version of the database which uses (a) single precesion, (b) 80x80 sampling in the energy and momentum space (c) 'gzip' to compress the gos data array. This helps for user with limited bandwidth for downloading. Version 1.6.1 release note: Add missing metadata Version 1.6 release note: Improved convergence for M and N edges for some elements Version 1.5 release note: Adaptive sampling for momentum space (previously it is fixed at 0.05 -50 Å-1, now adaptive for each edge) Improved convergence Version 1.2 release note: Add “File Type / File version” information Version 1.1 release note: Update to be consistent with GOSH data format [3] All the edges are now within a single hdf5 file. A notable change in particular, the sampling in momentum is in 1/m, instead of previously in 1/Å. Great thanks to Gulio Guzzinati for his suggestions and sending conversion script for GOSH format. [1] Verbeeck, J., and S. Van Aert. Ultramicroscopy 101.2-4 (2004): 207-224. [2] Leapman, R. D., P. Rez, and D. F. Mayers. The Journal of Chemical Physics 72.2 (1980): 1232-1243. [3] Segger, L, Guzzinati, G, & Kohl, H. Zenodo (2023). doi:10.5281/zenodo.7645765 [4] Gu, M. F. Canadian Journal of Physics 86(5) (2008): 675-689. The authors acknowledge financial support from the Research Foundation Flanders (FWO, Belgium) through Project No.G.0502.18N. This project has also received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 770887 PICOMETRICS and No. 823717 ESTEEM3).
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