Results 71 to 80 of about 538 (171)

Spatial Differentiation of Potential Drivers of Grassland Degradation Across Urban Functional Zones in Inner Mongolia

Land
Against the backdrop of global warming, grassland degradation (GD) in arid and semi-arid regions has become a critical issue constraining ecosystem stability and socio-ecological resilience.
Yong Mei, Batunacun, Chang An, Yunfeng Hu, Chunxing Hai, Ruifang Guo   +5 more
doaj   +1 more source

A Hasse diagram for rational toral ranks

Bulletin of the Belgian Mathematical Society - Simon Stevin, 2011
15 ...
openaire   +4 more sources

Fermionic non-invertible symmetries in (1+1)d: Gapped and gapless phases, transitions, and symmetry TFTs

SciPost Physics
We study fermionic non-invertible symmetries in (1+1)d, which are generalized global symmetries that mix fermion parity symmetry with other invertible and non-invertible internal symmetries.
Lakshya Bhardwaj, Kansei Inamura, Apoorv Tiwari
doaj   +1 more source

Spatio-temporal variation and influencing factors of carbon emissions from land use change in Xilingol region of Inner Mongolia, China

Ecological Indicators
Land use carbon emissions (LUCE) play a critical role in sustainable regional development. As a key coal production base and ecological barrier in northern China, the Xilingol League faces pressing challenges in balancing LUCE with sustainability ...
Anting Du, Siqin Tong, Jinyuan Ren, Gang Bao, Xiaojun Huang, Yuhai Bao, Dorjsuren Altantuya, Chunlan Li   +7 more
doaj   +1 more source

DAKS: An R Package for Data Analysis Methods in Knowledge Space Theory

Journal of Statistical Software, 2010
Knowledge space theory is part of psychometrics and provides a theoretical framework for the modeling, assessment, and training of knowledge. It utilizes the idea that some pieces of knowledge may imply others, and is based on order and set theory.
Ali Ünlü, Anatol Sargi
doaj  

Partially Ordered Sets in Socio-Economic Data Analysis

Encyclopedia
A partially ordered set (or a poset, for short) is a set endowed with a partial order relation, i.e., with a reflexive, anti-symmetric, and transitive binary relation.
Marco Fattore, Lucio De Capitani
doaj   +1 more source

On Some General Tornheim-Type Series

Mathematics
In this paper, we solve the open problem posed by Kuba by expressing ∑j,k≥1Hk(u)Hj(v)Hj+k(w)jrks(j+k)t as a linear combination of multiple zeta values. These sums include Tornheim’s double series as a special case.
Kwang-Wu Chen
doaj   +1 more source

Partial Order Ranking of the Key Drivers of Grassland Conversion in the Urban–Grassland Interface: A Case Study of the Hohhot–Baotou–Ordos Region

Applied Sciences
Identifying and ranking the key drivers of grassland conversion at the county level is crucial for developing targeted policies and improving protection efficiency.
Xuemei Li, Chang An, Batunacun, Yu Feng, Kaixin Liu, Yong Mei   +5 more
doaj   +1 more source

Root, flow and order polytopes with connections to toric geometry

Forum of Mathematics, Sigma
In this paper, we study the class of polytopes which can be obtained by taking the convex hull of some subset of the points $\{e_i-e_j \ \vert \ i \neq j\} \cup \{\pm e_i\}$ in $\mathbb {R}^n$ , where $e_1,\dots ,e_n$ is the standard ...
Konstanze Rietsch, Lauren Kiyomi Williams   +1 more
doaj   +1 more source

On General Alternating Tornheim-Type Double Series

Mathematics
In this paper, we express ∑n,m≥1ε1nε2mMn(u)Mm(v)nrms(n+m)t as a linear combination of alternating multiple zeta values, where εi∈{1,−1} and Mk(u)∈{Hk(u),H¯k(u)}, with Hk(u) and H¯k(u) being harmonic and alternating harmonic numbers, respectively.
Kwang-Wu Chen
doaj   +1 more source