Find research datasets worth reusing

Complementary files for Stability of classical planar dipole matter on regular and aperiodic lattices manuscript

Open the record for dataset details and reuse information.

Research Data for "Evaluating the electronic structure and stability of epitaxially grown Sr-doped LaFeO3 perovskite alkaline O2 evolution model electrocatalysts"

This is the research data supporting figures and tables for the paper "Evaluating the electronic structure and stability of epitaxially grown Sr-doped LaFeO3 perovskite alkaline O2 evolution model electrocatalysts" appearing in RSC Applied Interfaces under DOI <a title="Link to landing page via DOI" href="https://doi.org/10.1039/D4LF00260A">https://doi.org/10.1039/D4LF00260A</a>.

Research Data for "Electronic structure and stability of the active surface phase of NixCo3-xO4 spinel alkaline O2 evolution electrocatalysts: from an epitaxial model catalyst perspective"

These datasets support main text and supplementary figures and tables of the paper "Electronic structure and stability of the active surface phase of NixCo3-xO4 spinel alkaline O2 evolution electrocatalysts: from an epitaxial model catalyst perspective" appearing in ACS Applied Energy Materials under DOI: <a href="https://doi.org/10.1021/acsaem.4c01688">https://doi.org/10.1021/acsaem.4c01688 </a>

Stability and Water Solubility of Calcium Ferrite-type Phase in MgAl2O4-H2O Systems

Here are the experimental data.

VASP data for Structure and Stability of Copper Nanoclusters on Monolayer Tungsten Dichalcogenides

VASP INCAR and CONTCAR files

opencc-zeroDec 2017View details →

Data from: Acoustic stability in hyrax snorts: vocal tightrope-walkers or wrathful verbal assailants?

The source-filter theory proposes that information on caller properties is communicated through acoustic qualities, as physical state and performance ability are reflected in the voice. Vocal stability, manifested through harshness is especially intriguing, and has rarely been explored although harsh sounds are prevalent in nature. Male rock hyraxes (Procavia capensis) produce loud complex calls that we term songs. Only the calls of older, socially dominant males, include a harsh sound termed snort. As snorts are the rarest element in songs, we hypothesized that high quality snorts are difficult to produce, and that their quality consists in the ability to maintain smoothness throughout this low-pitched, harsh call. We quantified harshness by measuring periodicity deviations and expected to find a link between social parameters (residence, rank, and weight) and the ability to produce longer, smoother snorts. In addition, we presumed that if calls are used as vocal contests, conspecifics would avoid answering songs that exhibit a higher acoustic ability than their own songs. We found that in wild hyrax songs, snort harshness was associated with both weight and social rank, but in opposite directions. Heavier males produced smoother snorts and higher ranked individuals produced harsher snorts, possibly indicating aggressiveness. Playback experiments showed that longer and harsher synthetic snorts, inserted into natural songs, reduced conspecific answer rates. Snorts may communicate complex information on hyrax weight and dominance by means of element length and harshness. Our present results provide a stimulating insight into the understanding of acoustics in mammalian vocal communication.

opencc-zeroDec 2013View details →

Data from: A field test of a model for the stability of androdioecy in the freshwater shrimp, Eulimnadia texana

The evolution of hermaphroditism from dioecy is a poorly studied transition. Androdioecy (the coexistence of males and hermaphrodites) has been suggested as an intermediate step in this evolutionary transition or could be a stable reproductive mode. Freshwater crustaceans in the genus Eulimnadia have reproduced via androdioecy for 24+ million years and thus are excellent organisms to test models of the stability of androdioecy. Two related models that allow for the stable maintenance of males and hermaphrodites rely on the counterbalancing of three life history parameters. We tested these models in the field over three field seasons and compared the results to previous laboratory estimates of these three parameters. Male and hermaphroditic ratios within years were not well predicted using either the simpler original model or a version of this model updated to account for differences between hermaphroditic types ('monogenic' and 'amphigenic' hermaphrodites). Using parameter estimates of the previous year to predict the next year's sex ratios revealed a much better fit to the original relative to the updated version of the model. Therefore, counter to expectations, accounting for differences between the two hermaphroditic types did not improve the fit of these models. At the moment, we lack strong evidence that the long-term maintenance of androdioecy in these crustaceans is the result of a balancing of life history parameters; other factors, such as metapopulation dynamics or evolutionary constraints, may better explain the 24+ million year maintenance of androdioecy in clam shrimp.

opencc-zeroDec 2015View details →

Data from: Limited gene dispersal and spatial genetic structure as stabilizing factors in an ant-plant mutualism

Comparative studies of the population genetics of closely associated species are necessary to properly understand the evolution of these relationships because gene flow between populations affects the partners' evolutionary potential at the local scale. As a consequence (at least for antagonistic interactions), asymmetries in the strength of the genetic structures of the partner populations can result in one partner having a co-evolutionary advantage. Here, we assess the population genetic structure of partners engaged in a species-specific and obligatory mutualism: the Neotropical ant-plant, Hirtella physophora, and its ant associate, Allomerus decemarticulatus. Although the ant cannot complete its life cycle elsewhere than on H. physophora and the plant cannot live for long without the protection provided by A. decemarticulatus, these species also have antagonistic interactions: the ants have been shown to benefit from castrating their host plant and the plant is able to retaliate against too virulent ant colonies. We found similar short dispersal distances for both partners, resulting in the local transmission of the association and, thus, inbred populations in which too virulent castrating ants face the risk of local extinction due to the absence of H. physophora offspring. On the other hand, we show that the plant populations probably experienced greater gene flow than did the ant populations, thus enhancing the evolutionary potential of the plants. We conclude that such levels of spatial structure in the partners' populations can increase the stability of the mutualistic relationship. Indeed, the local transmission of the association enables partial alignments of the partners' interests, and population connectivity allows the plant retaliation mechanisms to be locally adapted to the castration behaviour of their symbionts.

opencc-zeroDec 2016View details →

Data from: Kleptoparasitism and scavenging can stabilize ecosystem dynamics

Scavenging is ubiquitous in nature and yet its implications for ecosystem dynamics have rarely been investigated. We used camera traps on wolf kills to investigate the role of scavenging on predator and multi-prey dynamics in a Northern Apennine system (Italy). In contrast to North American systems, throughout much of Eurasia, the omnivorous wild boar (Sus scrofa) successfully competes with wolves (Canis lupus) for the meat of their kills. We developed a deterministic multi-trophic web model (wolf, vegetation and two prey species, deer and wild boar), tunable through a parameter that governs the impact of prey-sharing between wolves and wild boar. When prey-sharing is absent or scarce, populations oscillate, but above a threshold value the trophic web is stabilized, with the regime solution becoming a fixed stable point. Both deer and wild boar then increase as a function of prey-sharing, and the impact of herbivores on the vegetation increases. When prey-sharing exceeds another threshold, however, the system collapses due to the extinction of both wolves and wild boar, but not of deer. Our analysis shows that scavenging is crucial for the dynamics of this ecosystem and thus, in general, it should not be overlooked in food web modelling. The exploitation of wolf kills by wild boar may allow juveniles and yearlings to obtain high quality resources that are not usually available, helping the omnivorous wild boar to compensate for losses caused by heavy hunting. This is likely to make them even more invasive and difficult to control.

opencc-zeroDec 2013View details →

Data from: The evolutionary stability of cross-sex, cross-trait genetic covariances

Although knowledge of the selective agents behind the evolution of sexual dimorphism has advanced considerably in recent years, we still lack a clear understanding of the evolutionary durability of cross-sex genetic covariances that often constrain its evolution. We tested the relative stability of cross-sex genetic covariances for a suite of homologous contact pheromones of the fruit fly Drosophila serrata, along a latitudinal gradient that these traits have diverged in mean. Using a Bayesian framework, which allowed us to account for uncertainty in all parameter estimates, we compared divergence in the total amounts and orientations of genetic variance across populations, finding divergence in orientation but not total variance. We then statistically compared orientation divergence of within-sex (G) to cross-sex (B) covariance matrices. In line with a previous theoretical prediction, we find that the cross-sex covariance matrix, B, is more variable than either male or female within-sex covariance matrix. Decomposition of B matrices into their symmetrical and non-symmetrical components revealed that instability is linked to the degree of asymmetry. We also find that the degree of asymmetry correlates with latitude suggesting a role for spatially varying natural selection in shaping genetic constraints on the evolution of sexual dimorphism.

opencc-zeroDec 2015View details →

Data from: Stability and generalization in seed dispersal networks: a case study of frugivorous fish in Neotropical wetlands

When species within guilds perform similar ecological roles, functional redundancy can buffer ecosystems against species loss. Using data on the frequency of interactions between fish and fruit, we assessed whether co-occurring frugivores provide redundant seed dispersal services in three species-rich Neotropical wetlands. Our study revealed that frugivorous fishes have generalized diets; however, large-bodied fishes had greater seed dispersal breadth than small species, in some cases, providing seed dispersal services not achieved by smaller fish species. As overfishing disproportionately affects big fishes, the extirpation of these species could cause larger secondary extinctions of plant species than the loss of small specialist frugivores. To evaluate the consequences of frugivore specialization for network stability, we extracted data from 39 published seed dispersal networks of frugivorous birds, mammals and fish (our networks) across ecosystems. Our analysis of interaction frequencies revealed low frugivore specialization and lower nestedness than analyses based on binary data (presence–absence of interactions). In that case, ecosystems may be resilient to loss of any given frugivore. However, robustness to frugivore extinction declines with specialization, such that networks composed primarily of specialist frugivores are highly susceptible to the loss of generalists. In contrast with analyses of binary data, recently developed algorithms capable of modelling interaction strengths provide opportunities to enhance our understanding of complex ecological networks by accounting for heterogeneity of frugivore–fruit interactions.

opencc-zeroJun 2021View details →

Data for: Sex pheromone signal and stability covary with fitness

If sexual signals are costly, covariance between signal expression and fitness is expected. Signal-fitness covariance is important, because it can contribute to the maintenance of genetic variation in signals that are under natural or sexual selection. Chemical signals, such as female sex pheromones in moths, have traditionally been assumed to be species-recognition signals, but their relationship with fitness is unclear. Here we test whether chemical, conspecific mate finding signals covary with fitness in the moth Heliothis subflexa. Additionally, as moth signals are synthesized de novo every night, the maintenance of the signal can be costly. Therefore, we also hypothesized that fitness covaries with signal stability (i.e., lack of temporal intra-individual variation). We measured among- and within-individual variation in pheromone characteristics as well as fecundity, fertility, and life span in two independent groups that differed in the time in between two pheromone samples. In both groups, we found fitness to be correlated with pheromone amount, composition, and stability, supporting both our hypotheses. This study is the first to report a correlation between fitness and sex pheromone composition in moths, supporting evidence of condition-dependence and highlighting how signal-fitness covariance may contribute to heritable variation in chemical signals both among and within individuals.

Stability analysis of roadside backfill body at gob-side entry retaining under combined static and dynamic loading

The applications of gob-side entry retaining (GER) techniques tends to increase over time as it can increase the minerals recovery rate and reduce the output of the waste. In the literature, only the performance of the roadside backfill body (RBB) at gob-side entry retaining under static loading has been investigated. However, failure mechanisms of the RBB under dynamic loading with various roof cutting angles have not been addressed. This study presented a numerical simulation of the fracture propagation and distribution in the roadside backfill body along the gob-side under combined static and dynamic loadings using the Trigon model built in UDEC (Discrete element methods) software. The influence of the roof cutting angles on the behavior of the RBB was also discussed. The input parameters were determined by back analysis with the field data. Results of the model show that static loading is a bigger contributor to the failure of the RBB compared to the dynamic loading. Several clear fractures were observed at top left and bottom right of the RBB and the fracture was more intensive at top left. In addition, it was found that if the roof cutting angle is 70°, the influence of the dynamic loading on the RBB is minimum, and the area and severity of the shearing failure in the RBB is minimum as well. As a result, it was determined the optimal roof cutting angle was 70° and a combined support measure of "roof cutting + roof support above RBBs + RBB reinforcement" is proposed. The application of roof cutting in gob-side entry retaining (RCGER) techniques in the Lingzhida coal mine indicates that deformation of the surrounding rocks can be effectively controlled.

opennotspecifiedJul 2021View details →

Supplementary data: "Revealing drivers and risks for power grid frequency stability with explainable AI"

This repository contains processed data and result files for the paper <a href="https://arxiv.org/abs/2106.04341">Revealing drivers and risks for power grid frequency stability with explainable AI</a>.  The code for producing the processed data and the results is <a href="https://github.com/johkruse/XAI-for-grid-frequency-stability">available at github</a>. Data For each area, the data folder contains the feature and target data used to train the ML model. <ul> <li>raw_input_data.h5 : The aggregated external features without additional engineered features.</li> <li>input_forecast.h5 and input_actual.h5: The day-ahead available (forecast) and ex-post available (actual) data of external features including the engineered features.</li> <li>outputs.h5 :  The grid frequency stability indicators.</li> <li>version_2021-07-01: Folder containing the training and test sets used for the results.</li> <li>documentation_of_data_download: Plots and information files concerning the ENTSO-E raw data and its aggregation.</li> </ul> Data sources The data for input features (raw_input_data.h5, input_forecast.h5 and input_actual.h5) is derived from ENTSO-E Transparency Platform data [1]. The target data (outputs.h5) is based on power grid frequency recordings from the German Transmission System Operator TransnetBW [2]. Results For each area and each target, the result folder comprises the results of hyper-parameter optimization, model prediction and interpretation via SHAP. The results refer to the full model and the restricted model (containing only day-ahead features). <ul> <li>cv_results_gtb_full.csv and cv_results_gtb_day_ahead.csv : Performance results for each combination in the hyper-parameter grid search.</li> <li>cv_best_params_gtb_full.csv and cv_best_params_gtb_day_ahead.csv : Hyper-parameters used in the final (optimized) model.</li> <li>shap_values_gtb_full.npy and shap_interaction_values_gtb_full.npy : First-order SHAP values and second-order SHAP interaction values for the full model.</li> <li>y_pred.h5 : Predictions of daily profile predictor, full model and day-ahead model.</li> </ul> Disclaimer The data might be subject to copyright or related rights. Please consult the primary data owner.

Associations among cotyledon developmental stability, canalization and phenotypic plasticity in response to shading and burial depth in five herbaceous species at early seedling stage

Premise of research. Cotyledons have important functions in early seedling stage and have important effects on later stages, but we know little about the relationships among developmental stability, canalization and phenotypic plasticity in cotyledons. Methodology. We conducted a field experiment with five herbaceous species, by subjecting them to contrasting light conditions and burial depths and measuring their cotyledon size and fluctuating asymmetry (random deviation from perfect bilateral symmetry, indicating developmental stability or instability), coefficient of variation and plasticity of cotyledon size, to investigate the relationships among cotyledon developmental stability, canalization and plasticity in response to shading and deep burial. Pivotal results. Pharbitis purpurea, Convolvulus arvensis and Carpesium abrotanoides had increased cotyledon size in response to shading at both burial depths; Abutilon theophrasti showed reduced cotyledon size in response to shading vs. full light at shallow depth, but greater cotyledon size in response to both shading and deep burial. Shading increased cotyledon fluctuating asymmetry of P. purpurea and C. abrotanoides, while deep burial decreased it. Cotyledon fluctuating asymmetry had positive correlations with coefficient of variation and plasticity in response to shade in shading, with little correlation between coefficient of variation and plasticity. Conclusions. Results suggested A. theophrasti may have greater tolerance for multiple stresses than the other species, and deep burial may improve shade tolerance of cotyledons through moderate level of stress selection. Both developmental instability and decreased canalization may indicate the state of faster growth. Developmental instability can facilitate more-active response to shading in cotyledon, while the relationship between canalization and plasticity should be more complex.

Associations between leaf developmental stability, variability, canalization and phenotypic plasticity in Abutilon theophrasti

Developmental stability, canalization, and phenotypic plasticity are the most common sources of phenotypic variation, yet comparative studies investigating the relationships between these sources, specifically in plants, are lacking. To investigate the relationships among developmental stability or instability, developmental variability, canalization and plasticity in plants, we conducted a field experiment with Abutilon theophrasti, by subjecting plants to three densities under infertile vs. fertile soil conditions. We measured the leaf width (leaf size) and calculated fluctuating asymmetry (FA), coefficient of variation within and among individuals (CVintra and CVinter), and plasticity (PIrel) in leaf size at day 30, 50 and 70 of plant growth, to analyze the correlations among these variables in response to density and soil conditions, at each of or across all growth stages. Results showed increased density led to lower leaf FA, CVintra and PIrel and higher CVinter in fertile soil. A positive correlation between FA and PIrel occurred in infertile soil, while correlations between CVinter and PIrel and between CVinter and CVintra were negative at high density and/or in fertile soil, with non-significant correlations among them in other cases. Results suggested the complexity of responses of developmental instability, variability and canalization in leaf size as well as their relationships, which depend on the strength of stresses. Intense aboveground competition that accelerates the decrease in leaf size (leading to lower plasticity) will be more likely to reduce developmental instability, variability and canalization in leaf size. Increased developmental instability and intra- and inter-individual variability should be advantageous and facilitate adaptive plasticity in less stressful conditions, thus they are more likely to positively correlate with plasticity; whereas developmental stability and canalization with lower developmental variability should be beneficial for stabilizing plant performance in more stressful conditions, where they tend to have more negative correlations with plasticity.

Is phylogeographic congruence predicted by historical habitat stability, or ecological co-associations?

Comparative phylogeographic studies can uniquely distinguish idiosyncratic versus community-wide responses to past environmental change. However, to date, impacts of species interactions have been largely overlooked. Here we used non-genetic data to characterize two competing scenarios about expected levels of congruence among five saproxylic invertebrate species (i.e., a wood-feeding cockroach, termite and beetle; a predatory centipede, and a detritivorous millipede) from the southern Appalachians mountains—a topographically complex unglaciated landscape. Under one scenario, abiotic factors primarily drove species' responses, with predicted congruence based on spatial overlap of climatically stable habitat areas estimated for each species via ecological niche modeling. The other scenario considered biotic factors to be most influential, with proxies for actual or potential direct interactions used to predict congruence. Analyses of mitochondrial and nuclear DNA sequence datasets for each species focused on four axes of comparison: the number and distribution of spatial-genetic clusters, phylogeographic structure, changes in long-term effective population size, and historical gene flow dynamics. Overall, we found stronger support for ecological co-associations scenario, suggesting an important influence of biotic factors in constraining or facilitating species' responses to Pleistocene climatic cycles. However, there was an imperfect fit between this scenario's predictions and outcomes of empirical data analyses. Thus, our conclusions are compelling, but tentative. This work advances comparative phylogeography by expanding the scope of inferences beyond abiotic drivers, and provides insights into the evolutionary history of a functionally important ecological community, within a globally recognized center of endemism.

Lineage-specific variation in the evolutionary stability of coral photosymbiosis.

Over half of reef-building corals (Scleractinia) participate in a nutritional symbiosis, known as photosymbiosis, with photosynthetic dinoflagellates that ranges from obligate to facultative dependence. Fitting hidden-rates models allowing among-lineage variation in the rate of trait evolution to supertree and molecular phylogenies of Scleractinia, we reconstruct the history of photosymbiosis within Scleractinia and characterize its evolutionary stability. We find that most lineages of scleractinians are extraordinarily stable for the trait, evincing no instances of loss, but that in some clades photosymbiosis is more labile, thus providing a framework for comparative studies to further our mechanistic understanding of the factors that shape the evolutionary fates of scleractinian photosymbiosis.

opencc-by-4.0Aug 2021View details →

Supplementary Materials for paper Evaluating the Rate of Consistency Violation Faults for Self-Stabilizing Programs

Source code and data for the paper Evaluating the Rate of Consistency Violation Faults for Self-Stabilizing Programs Content: + directory src: source code + directory lib: libaries used by source code + directory graphs: input graphs (topology) for programs + directory results-2021: analysis and simulation data + run_analyze_cvf_script.sh: script for running analysis + run_simulation_script.sh: script for running simulation