Filters








84,959 Hits in 4.8 sec

The role of local versus biogeographical processes in influencing diversity and body-size variation in mammal assemblages

Luiz Carlos S. Lopez, Marcos S. L. Figueiredo, Maria Paula de Aguiar Fracasso, Daniel Oliveira Mesquita, Ulisses Umbelino Anjos, Carlos Eduardo Viveiros Grelle
2016 Ecology and Evolution  
This process, which can operate even in the absence of competitive saturation at local scales, generates continental assemblages with steeper slopes, smaller modal sizes, and higher right skewness (toward  ...  Our objective was to estimate and analyze the body-size distribution parameters of terrestrial mammal assemblages at different spatial scales, and to determine whether these parameters are controlled by  ...  Acknowledgments This work is supported by research fellowship from PAPD-CAPES/FAPERJ to MSLF, CNPq/FAPERJ to CEVG, CNPq to DOM, and CAPES to MPAF.  ... 
doi:10.1002/ece3.1978 pmid:27087924 pmcid:PMC4775520 fatcat:5vjt6oxvtbdxnppossto45npqu

Synergistic impacts of habitat loss and fragmentation on model ecosystems

Lewis J. Bartlett, Tim Newbold, Drew W. Purves, Derek P. Tittensor, Michael B. J. Harfoot
2016 Proceedings of the Royal Society of London. Biological Sciences  
We use a multi-trophic, trait-based, and spatially explicit general ecosystem model to examine the independent and synergistic effects of these processes on ecosystem structure.  ...  We manipulated habitat by removing plant biomass in varying spatial extents, intensities, and configurations.  ...  [32] , which have been tested to recreate empirical ecological processes (electronic supplementary material, S2 and (c) Information extracted for analysis As a summary measure of ecosystem change,  ... 
doi:10.1098/rspb.2016.1027 pmid:27655763 pmcid:PMC5046893 fatcat:75pthgewazaetbfwpgavnq64sq

Evaluation of the statistical cloud scheme in the ECHAM5 model using satellite data

T. Weber, J. Quaas, P. Räisänen
2011 Quarterly Journal of the Royal Meteorological Society  
Moreover, sensitivity experiments were performed to reveal the deficiencies in the parametrization leading to the observed deviations of variance and skewness of TWP.  ...  However, large deficiencies are revealed by the evaluation of both variance and skewness of the probability density function (PDF).  ...  In the sensitivity study, simulated skewness compares better with the observations in the Tropics by exhibiting now only small values of skewness for the vertically integrated total water, instead of the  ... 
doi:10.1002/qj.887 fatcat:bgkcrnd5rvgojijtg4t2halr4q

Compare and Evaluate the Performance of Gaussian Spatial Regression Models and Skew Gaussian Spatial Regression Based on Kernel Averaged Predictors

Somayeh Shahraki Dehsoukhteh
2015 American Journal of Theoretical and Applied Statistics  
Therefore, in this article, skew Gaussian spatial regression model is studied and the performance of the model is presented and evaluated in comparison with Gaussian spatial regression models based on  ...  kernel averaged predictors using simulation studies and real examples.  ...  But in many application examples, spatial variables follow a skew distribution. One common method for analysis of such data skew normal distribution.  ... 
doi:10.11648/j.ajtas.20150405.17 fatcat:tbj7rl3etvbczh3arkwq2u5uje

Vernier judgments in the absence of regular shape information

Saumil S. Patel, Harold E. Bedell, Michael T. Ukwade
1999 Vision Research  
In this study, we investigated the effect of shape information on hyperacuity performance using targets of irregular shape with different skew and symmetry properties.  ...  Because the test and the reference objects usually have regular shapes (e.g. rectangular, triangular or circular), relatively few studies have addressed the role of shape information in determining hyperacuity  ...  In this study, we compared Vernier thresholds for configurations of asymmetric irregular solid shapes, and solid dot targets of the same area.  ... 
doi:10.1016/s0042-6989(98)00265-x pmid:10367056 fatcat:tmd5kuzsdja3lkkujudpu2cwb4

DARP: Dynamically Adaptable Resilient Pipeline design in microprocessors

Hu Chen, Sanghamitra Roy, Koushik Chakraborty
2014 Design, Automation & Test in Europe Conference & Exhibition (DATE), 2014  
In this paper, we demonstrate that the sensitized path delays in various microprocessor pipe stages exhibit intriguing temporal and spatial variations during the execution of real world applications.  ...  Using a rigorous circuitarchitectural infrastructure, we demonstrate substantial improvements in the performance (9.4-20%) and energy efficiency (6.4-27.9%), compared to state-of-the-art techniques.  ...  Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.  ... 
doi:10.7873/date.2014.075 dblp:conf/date/ChenRC14 fatcat:yqdyqit6a5ehrdwqkxjry36vxq

Characterizing hyporheic transport processes — Interpretation of electrical geophysical data in coupled stream–hyporheic zone systems during solute tracer studies

Adam S. Ward, Michael N. Gooseff, Kamini Singha
2010 Advances in Water Resources  
of ER to predict spatial and temporal trends of solute distribution and transport in stream-hyporheic systems.  ...  Here, we couple simulations of near-surface electrical resistivity (ER) methods with conservative solute transport to directly compare solute transport with ER interpretations, and to determine the ability  ...  Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.  ... 
doi:10.1016/j.advwatres.2010.05.008 fatcat:4eulj5mvsjdopbvteoklh2rpd4

Multi-Channel Compression and Coding of Reverberant Ad-Hoc Recordings Through Spatial Autoregressive Modelling

Shahab Pasha, Jan Lundgren
2019 2019 30th Irish Signals and Systems Conference (ISSC)  
State of the art multi-channel linear prediction methods do not take into account the spatial locations of the microphones and assume single distance compact microphone arrays.  ...  The proposed method estimates the spatial distances between each microphone and the source to optimise the joint compression of the microphones covering a wide area.  ...  to the source in the joint analysis process.  ... 
doi:10.1109/issc.2019.8904918 fatcat:ef7kuekeszeypcvtd45ij3isdu

Visualizing Multiple Variables Across Scale and Geography

Sarah Goodwin, Jason Dykes, Aidan Slingsby, Cagatay Turkay
2016 IEEE Transactions on Visualization and Computer Graphics  
This sensitivity depends upon the calculation of locality as well as the geographical and statistical structure of the variable.  ...  These techniques enable multiple variables and their geographic characteristics to be considered concurrently as we extend visual parameter space analysis (vPSA) to the spatial domain.  ...  Thanks to Tamara Munzner, IEEE VIS 2014 participants and members of the giCentre and g2Lab (HCU Hamburg) for their feedback and support.  ... 
doi:10.1109/tvcg.2015.2467199 pmid:26390471 fatcat:nov5kceex5f2jbdpvmschpy36e

The maternal X chromosome impairs cognition and accelerates brain aging through epigenetic modulation in female mice [article]

Samira Abdulai-Saiku, Shweta Gupta, Dan Wang, Arturo Moreno, Yu Huang, Deepak Srivastava, Barbara Panning, Dena Dubal
2022 bioRxiv   pre-print
Parent-of-X-origin can modify epigenetics via DNA methylation and possibly gene expression; thus, mosaicism could buffer dysregulated processes in aging and disease.  ...  However, whether X skewing - or its mosaicism - alters functions in females is largely unknown. Here we tested whether skew toward the maternal X (Xm) influences key functions of the body.  ...  We thank Sundeep Kalantry for providing mice with an Xist deletion and Chen Chen for mouse colony management.  ... 
doi:10.1101/2022.03.09.483691 fatcat:a7zoc7g4q5g2ppqlivgt557ab4

Improving tumour heterogeneity MRI assessment with histograms

N Just
2014 British Journal of Cancer  
markers of heterogeneity can be compared.  ...  During the past decade, the number of studies using histogram approaches increased drastically with various magnetic resonance imaging (MRI) techniques (DCE-MRI, DWI, SWI etc.) although information on  ...  Dr Nathalie Just was supported by the Centre d'Imagerie BioMédicale (CIBM) of the Ecole Polytechnique Fédérale de Lausanne (EPFL) and the Leenards and Jeantet foundations.  ... 
doi:10.1038/bjc.2014.512 pmid:25268373 pmcid:PMC4264439 fatcat:e5rngqtporbi7htueutvp2mqfy

Can we infer plant facilitation from remote sensing? a test across global drylands

Chi Xu, Milena Holmgren, Egbert H. Van Nes, Fernando T. Maestre, Santiago Soliveres, Miguel Berdugo, Sonia Kéfi, Pablo A. Marquet, Sebastián Abades, Marten Scheffer
2015 Ecological Applications  
This has often restricted the study of facilitation to particular sites, limiting the development of systematic assessments of facilitation over regional and global scales.  ...  Detecting positive plant-plant interactions relies on the combination of field experimentation and the demonstration of spatial association between neighboring plants.  ...  Skewness of the patch-size distribution is thus a simple and sensitive indicator of the way in which the shape of the patch-size distribution is affected by spatial association of individual plants as  ... 
doi:10.1890/14-2358.1 pmid:26552256 pmcid:PMC4910861 fatcat:tpnd2yunhvbzvpbvwhkwmtzsjm

Saccadic distractor effects: The remote distractor effect (RDE) and saccadic inhibition (SI): A response to McIntosh and Buonocore (2014)

R. Walker, V. Benson
2015 Journal of Vision  
single inhibitory process, or more sensitive indicators of it, than is median latency.  ...  We (Walker & Benson, 2013) reported studies in which the spatial effects of distractors on the remote distractor effect (RDE) and saccadic inhibition (SI) were examined.  ...  It can be seen that the two measures of SI are broadly comparable across distractor spatial location and SOA.  ... 
doi:10.1167/15.2.6 pmid:25761345 fatcat:dpv332zomfdn5mdrtuq5nb7toa

Assessing the Impact of Astrochemistry on Molecular Cloud Turbulence Statistics

Ryan D. Boyden, Stella S. R. Offner, Eric W. Koch, Erik W. Rosolowsky
2018 Astrophysical Journal  
The statistics with meaningful responses include principal component analysis, spatial power spectrum and bicoherence.  ...  We investigate the sensitivity of 15 commonly applied turbulence statistics to post-processing assumptions, namely variations in gas temperature, abundance and external radiation field.  ...  The skewness and kurtosis pdf's are weakly sensitive to all model parameters, and the spatial distributions of skewness and kurtosis appear well correlated with cloud discontinuities. 3.  ... 
doi:10.3847/1538-4357/aac76d fatcat:ejuqeih65bbfretyb6kddi67ra

ROC Analysis of Statistical Methods Used in Functional MRI: Individual Subjects

Pawel Skudlarski, R.Todd Constable, John C. Gore
1999 NeuroImage  
The receiver operator characteristic (ROC) method is used to compare the efficacy of various steps in calculating an activation map in the study of a single subject based on optimizing the ratio of the  ...  Spatial clustering. an initial spatial smoothing of images is more efficient than cluster filtering of the statistical parametric activation maps.  ...  We do not attempt to compare the efficiency of analysis with and without motion correction, but we want to evaluate the power of some processing steps analyzed above that may be most sensitive to motion  ... 
doi:10.1006/nimg.1999.0402 pmid:10075901 fatcat:sywk435d25e6tncpfx4pqad74q
« Previous Showing results 1 — 15 out of 84,959 results