Results 21 to 30 of about 1,621,829 (188)

Spatial Pattern and Ecological Process Difference Analyses of the Boundary Habitats of a Treeline Patch: A Case Study from the Li Mountain, North China

Land, 2022
Treeline patches are among Earth’s most sensitive and are important model ecosystems for assessing climate change trends. To explore ecological factors that limit the species’ survival in treelines, the treeline patch of Li Mountain National Nature ...
Meiyu Jia, Jintun Zhang, Zhenhui Song, Sehrish Sadia   +3 more
doaj   +1 more source

Link Prediction in Directed Networks Utilizing the Role of Reciprocal Links

IEEE Access, 2020
Link prediction in directed networks has always been a hot topic in many fields including network science, information system and data mining. Intuitively, once links are endowed with certain orientations, their reciprocate nature can potentially provide
Jinsong Li, Jianhua Peng, Shuxin Liu, Xinsheng Ji, Xing Li, Xinxin Hu   +5 more
doaj   +1 more source

Measuring nestedness: A comparative study of the performance of different metrics

Ecology and Evolution, 2020
Nestedness is a property of interaction networks widely observed in natural mutualistic communities, among other systems. A perfectly nested network is characterized by the peculiarity that the interactions of any node form a subset of the interactions ...
Clàudia Payrató‐Borràs, Laura Hernández, Yamir Moreno   +2 more
doaj   +1 more source

Assembly Processes and Co-occurrence Patterns of Abundant and Rare Bacterial Community in the Eastern Indian Ocean

Frontiers in Microbiology, 2021
Microbial communities are composed of many rare species and a few abundant species. Considering the disproportionate importance of rare species for ecosystem functioning, it is important to understand the mechanisms structuring the rare and abundant ...
Liuyang Li, Liuyang Li, Laxman Pujari, Chao Wu, Danyue Huang, Danyue Huang, Yuqiu Wei, Yuqiu Wei, Congcong Guo, Congcong Guo, Guicheng Zhang, Wenzhe Xu, Haijiao Liu, Xingzhou Wang, Xingzhou Wang, Min Wang, Jun Sun, Jun Sun   +17 more
doaj   +1 more source

Can one detect a non-smooth null infinity? [PDF]

, 2001
It is shown that the precession of a gyroscope can be used to elucidate the nature of the smoothness of the null infinity of an asymptotically flat spacetime (describing an isolated body).
Bondi H, Bonnor W B, Chrusciel P T, Chrusciel P T, Courant R, Ellis G F R, Hernández J, Herrera L, Juan Antonio Valiente Kroon, Leipold G, Penrose R, Rindler W, Sachs R K, Sachs R K, Sommerfeld A, Valiente Kroon J A, Valiente Kroon J A, Valiente Kroon J A, Valiente Kroon J A, Walker M   +19 more
core   +2 more sources

Deterministic processes dominate archaeal community assembly from the Pearl River to the northern South China Sea

Frontiers in Microbiology, 2023
Archaea play a significant role in the biogeochemical cycling of nutrients in estuaries. However, comprehensive researches about their assembly processes remain notably insufficient.
Xizheng Lin, Xizheng Lin, Xizheng Lin, Chuanlun Zhang, Chuanlun Zhang, Chuanlun Zhang, Wei Xie, Wei Xie, Wei Xie   +8 more
doaj   +1 more source

Reconstruction of the null-test for the matter density perturbations [PDF]

, 2015
We systematically study the null-test for the growth rate data first presented in [S. Nesseris and D. Sapone, arXiv:1409.3697] and we reconstruct it using various combinations of data sets, such as the $f\sigma_8$ and $H(z)$ or Type Ia supernovae (SnIa ...
García-Bellido, Juan, Nesseris, Savvas, Sapone, Domenico   +2 more
core   +3 more sources

Super Yang-Mills in (11,3) Dimensions [PDF]

, 1997
A supersymmetric Yang-Mills system in (11,3) dimensions is constructed with the aid of two mutually orthogonal null vectors which naturally arise in a generalized spacetime superalgebra.
Bars, Bars, Bars, Bars, Bars, Das, Ergin Sezgin, Hull, Kugo, Kutasov, Nishino, Sezgin, Townsend, Vafa   +13 more
core   +3 more sources

Null-vectors in Integrable Field Theory [PDF]

, 1997
The form factor bootstrap approach allows to construct the space of local fields in the massive restricted sine-Gordon model. This space has to be isomorphic to that of the corresponding minimal model of conformal field theory.
D. Bernard B, F. A. Smirnov, O. Babelon A, Service Physique, Théorique Saclay   +4 more
core   +6 more sources

A Matrix Model for the Null-Brane

, 2005
The null-brane background is a simple smooth 1/2 BPS solution of string theory. By tuning a parameter, this background develops a big crunch/big bang type singularity.
A. Bergman, A. Hashimoto, A. Lawrence, B. Chen, B. Craps, B. Craps, B. Durin, B. Pioline, B.L. Cerchiai, D. Robbins, D. Robbins, D.W. Chiou, Daniel Robbins, E.J. Martinec, H. Liu, H. Liu, J. Figueroa-O'Farrill, J. Gomis, J. McGreevy, J. Simon, J. Simon, J.-H. She, J.L. Hovdebo, J.R. David, K. Dasgupta, K. Dasgupta, K. Okuyama, L. Fidkowski, L. Motl, L. Motl, M. Alishahiha, M. Berkooz, M. Berkooz, M. Berkooz, M. Berkooz, M. Fabinger, M. Fabinger, M. Li, O.J. Ganor, S. Elitzur, S. Kawai, Savdeep Sethi, T. Hertog, T. Hertog, T. Ishino, V.E. Hubeny, Y. Hikida, Y. Hikida   +47 more
core   +2 more sources