Results 51 to 60 of about 22,265,852 (345)
Null physical states in string models [PDF]
Journal of High Energy Physics, 2013 This note is a brief addendum to my article Nucl. Phys. B 864 (2012) 285, [arXiv: 1110.5510], which discusses the noghost theorem in Ramond sectors of string models. In this addendum we derive additional information about the structure of null physical states in the Ramond-Neveu-Schwarz model.
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Diversity and Selection of Surface Marine Microbiomes in the Atlantic-Influenced Arctic
Frontiers in Microbiology, 2022 Arctic marine environments are experiencing rapid changes due to the polar amplification of global warming. These changes impact the habitat of the cold-adapted microbial communities, which underpin biogeochemical cycles and marine food webs.
Nerea J. Aalto +7 more
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Mate Choice and Null Models [PDF]
Philosophy of Science, 2020 Biologists have proposed a variety of explanations for extravagant sexual displays, and controversies over explanations define the history of sexual selection research. Recently, Richard Prum has defended Darwin’s idea that the evolution of sexual displays is driven by arbitrary and nonadaptive preferences of potential mates.
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Ecology and Evolution, 2020 Identifying seasonal shifts in community assembly for multiple biological groups is important to help enhance our understanding of their ecological dynamics. However, such knowledge on lotic assemblages is still limited. In this study, we used biological
Jun Wang +6 more
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Bi-dimensional null model analysis of presence-absence binary matrices.
Ecology, 2018 Comparing the structure of presence/absence (i.e., binary) matrices with those of randomized counterparts is a common practice in ecology. However, differences in the randomization procedures (null models) can affect the results of the comparisons ...
G. Strona, W. Ulrich, N. Gotelli
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The architecture of antagonistic networks: Node degree distribution, compartmentalization and nestedness [PDF]
Computational Ecology and Software, 2015 Describing complex ecosystems as networks of interacting components has proved fruitful - revealing many distinctive patterns and dynamics of ecological systems.
Savannah Nuwagaba, Cang Hui
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Evidence for the Vacated Niche Hypothesis in Parasites of Invasive Mammals
Ecology and EvolutionSpecies redistribution and invasion are becoming increasingly common due to climate change and anthropogenic impacts. Understanding the resultant shifts in host–parasite associations is important for anticipating disruptions to host communities, disease ...
Annakate M. Schatz, Andrew W. Park
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Using Model Analysis to Unveil Hidden Patterns in Tropical Forest Structures
Frontiers in Ecology and Evolution, 2021 When ordinating plots of tropical rain forests using stand-level structural attributes such as biomass, basal area and the number of trees in different size classes, two patterns often emerge: a gradient from poorly to highly stocked plots and high ...
Nicolas Picard +18 more
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Pediatric Blood &Cancer, EarlyView.ABSTRACT Objectives To identify predictors of chronic ITP (cITP) and to develop a model based on several machine learning (ML) methods to estimate the individual risk of chronicity at the timepoint of diagnosis. Methods We analyzed a longitudinal cohort of 944 children enrolled in the Intercontinental Cooperative immune thrombocytopenia (ITP) Study ...
Severin Kasser +6 more
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NULL ENERGY CONDITION AND DARK ENERGY MODELS [PDF]
Modern Physics Letters A, 2008 Null Energy Condition (NEC) requires the equation of state (EoS) of the universe wu satisfy wu ≥ -1, which implies, for instance in a universe with matter and dark energy dominating wu = w m Ω m + w de Ω de = w de Ω de ≥ -1. In this paper we study constraints on the dark energy models from the requirement of the NEC.
Qiu, Taotao, Cai, Yi-Fu, Zhang, Xin-Min
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