Avalanche Network Structural Evolution雪崩网络结构演变
Year-by-year structural indicators of the global cobalt avalanche network (1998–2019). Computed over country–layer nodes (Ore / Material / Product / Use / Waste / Secondary) and directed edges connecting risk sources and risk bearers identified through the avalanche process.
全球钴雪崩网络逐年结构指标（1998–2019）。 基于国家–层级节点（矿石 / 材料 / 产品 / 使用 / 废弃 / 二次回收）以及通过雪崩过程识别出的、 连接风险来源与风险承受方的有向边计算得出。
Network Size (Nodes)
Number of country–layer nodes participating in the network each year.
Network Size (Edges)
Directed trade edges between country–layer nodes.
Density
Fraction of possible directed edges that exist — higher = more interconnected.
Reciprocity
Share of edges whose reverse also exists — bidirectional trade intensity.
Transitivity (Clustering)
Probability that two neighbors of a node are themselves connected.
Degree Centrality (mean)
Average normalized degree — how central the typical node is.
Eigenvector Centrality (mean)
Average eigenvector centrality — importance weighted by neighbors' importance.
Largest Component — Node Share
Fraction of all nodes in the largest weakly-connected component.
Largest Component — Edge Share
Fraction of all edges inside the largest weakly-connected component.