Results 21 to 30 of about 3,141,129 (301)

Precise identification and threshold inversion of pores and fissures in CT digital coal rock based on Bi-PTI model

Meitan xuebao, 2023
In the research area of the CT digital coal petrography, the selection of gray threshold directly affects the accuracy of spatial structure remodeling. To allow the pores and fissures space remodeling data to more accurately represent the real structure ...
Chenguang HAO, Xiaoyang GUO, Cunbao DENG, Xinghua ZHANG, Bo ZHAO, Xun WANG   +5 more
doaj   +1 more source

The Spatial Structure of An Accretion Disk [PDF]

, 2007
Based on the microlensing variability of the two-image gravitational lens HE1104-1805 observed between 0.4 and 8 microns, we have measured the size and wavelength-dependent structure of the quasar accretion disk.
Christopher S. Kochanek, Courbin F., Grieger B., Nicholas Morgan, Shakura N. I., Shawn Poindexter, Wisotzki L., Wyrzykowski   +7 more
core   +2 more sources

Replicated Spatial Point Pattern Analyses for Ecological Inference: A Tutorial Using the RSPPlme4 Package in R

Frontiers in Forests and Global Change, 2022
The analysis of spatial point patterns has greatly advanced our understanding of ecological processes. However, the methods currently available for analyzing replicated spatial point patterns (RSPPs) are rarely used by ecologists.
Robert Bagchi, Michael C. LaScaleia, Valerie R. Milici, Dipanjana Dalui   +3 more
doaj   +1 more source

Drivers of population divergence and genetic variation in Elymus breviaristatus (Keng) Keng f. (Poaceae: Triticeae), an endemic perennial herb of the Qinghai-Tibet plateau

Frontiers in Ecology and Evolution, 2022
Elymus breviaristatus, a rare grass species with excellent resistance and ecological importance, is narrowly distributed on the Qinghai-Tibet plateau. Populations of E.
Jin Li, Saier Ma, Keke Jiang, Changbing Zhang, Wenhui Liu, Shiyong Chen   +5 more
doaj   +1 more source

Spatially embedded random networks [PDF]

, 2007
Many real-world networks analyzed in modern network theory have a natural spatial element; e.g., the Internet, social networks, neural networks, etc. Yet, aside from a comparatively small number of somewhat specialized and domain-specific studies, the ...
B. Bollobás, B. D. Ripley, D. Stirzaker, E. Di Paolo, J. M. Lee, L. Barnett, M. Penrose, Q. Lu, S. Bullock, S. Muthukrishnan, T. M. Apostol   +10 more
core   +1 more source

Spatial Pattern and Influencing Factors of Urban Invisible Consumption: A Case Study of Changsha

Redai dili, 2023
Urban invisible consumption space is a physical consumption space with weak visibility in urban public space, which has become a new channel for urban business and consumption development.
Liang Yixin, Ye Qiang, Zhao Yao, Du Zhuoyang, Wan Yuxuan   +4 more
doaj   +1 more source

Spatial network surrogates for disentangling complex system structure from spatial embedding of nodes [PDF]

, 2016
ACKNOWLEDGMENTS MW and RVD have been supported by the German Federal Ministry for Education and Research (BMBF) via the Young Investigators Group CoSy-CC2 (grant no. 01LN1306A).
Donges, Jonathan F., Donner, Reik V., Kurths, Jürgen, Wiedermann, Marc   +3 more
core   +3 more sources

A Multi-Feature Framework for Quantifying Information Content of Optical Remote Sensing Imagery

Remote Sensing, 2022
Quantifying the information content of remote sensing images is considered to be a fundamental task in quantitative remote sensing. Traditionally, the grayscale entropy designed by Shannon’s information theory cannot capture the spatial structure of ...
Luo Silong, Zhou Xiaoguang, Hou Dongyang, Nawaz Ali, Kang Qiankun, Wang Sijia   +5 more
doaj   +1 more source

Identifying the Production–Living–Ecological Functional Structure of Haikou City by Integrating Empirical Knowledge with Multi-Source Data

ISPRS International Journal of Geo-Information, 2023
The inefficient use of urban resources and the imbalance of spatial structures make optimizing land use management a top priority in urban environmental management.
Bingbing Zhao, Xiaoyong Tan, Liang Luo, Min Deng, Xuexi Yang   +4 more
doaj   +1 more source

Synergistic effect of CaO and red mud on the water resistance of phosphogypsum-based cementitious materials

Case Studies in Construction Materials
To enhance the water resistance of phosphogypsum-based cementitious materials and promote solid-waste utilization, red mud (RM) was incorporated to develop phosphogypsum-based composites (RPG).
Jiazhe Chen, Bo Shen, Qingqing Xie, Yao Xiao, Changrui Liang   +4 more
doaj   +1 more source