The rate at which nodes in evolving social networks acquire links (friends, citations) shows complex temporal dynamics. Preferential attachment and link copying models, while enabling elegant analysis, only capture rich-gets-richer e ects, not aging and decline. Recent aging models are complex and heavily parameterized; most involve estimating 1-3 parameters per node. These parameters are intrinsic: they explain decline in terms of events in the past of the same node, and do not explain, using the network, where the linking attention might go instead. We argue that traditional characterization of linking dynamics are insu cient to judge the faithfulness of models. We propose a new temporal sketch of an evolving graph, and introduce several new characterizations of a network's temporal dynamics. Then we propose a new family of frugal aging models with no per-node parameters and only two global parameters. Our model is based on a surprising inversion or undoing of triangle completion, where an old node relays a citation to a younger follower in its immediate vicinity. Despite very few parameters, the new family of models shows remarkably better t with real data. Before concluding, we analyze temporal signatures for various research communities yielding further insights into their comparative dynamics. To facilitate reproducible research, we shall soon make all the codes and the processed dataset available in the public domain.
This work investigates the effect of boron addition on the microstructure and mechanical properties of a near alpha Ti alloy, Timetal 685 in as-cast plus heat-treated condition. While significant refinement of the prior b grain size is seen with small additions of boron, the thickness of a lath (in transformed b structure) increases with increasing boron. At room temperature (RT), tensile yield strength increases marginally, but the ductility drops significantly possibly because of the cracking of TiB phase. At elevated temperature, significant strengthening is observed in the boron containing alloys especially at higher plastic strains.Additionally, the creep resistance shows significant enhancement with boron addition.
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