593 research outputs found
Principled Multilayer Network Embedding
Multilayer network analysis has become a vital tool for understanding
different relationships and their interactions in a complex system, where each
layer in a multilayer network depicts the topological structure of a group of
nodes corresponding to a particular relationship. The interactions among
different layers imply how the interplay of different relations on the topology
of each layer. For a single-layer network, network embedding methods have been
proposed to project the nodes in a network into a continuous vector space with
a relatively small number of dimensions, where the space embeds the social
representations among nodes. These algorithms have been proved to have a better
performance on a variety of regular graph analysis tasks, such as link
prediction, or multi-label classification. In this paper, by extending a
standard graph mining into multilayer network, we have proposed three methods
("network aggregation," "results aggregation" and "layer co-analysis") to
project a multilayer network into a continuous vector space. From the
evaluation, we have proved that comparing with regular link prediction methods,
"layer co-analysis" achieved the best performance on most of the datasets,
while "network aggregation" and "results aggregation" also have better
performance than regular link prediction methods
Review of the Resources and Utilization of Bamboo in China
China has made a breakthrough in the development and scientific cultivation of bamboo. At present, China ranks first in bamboo research worldwide, because of numerous research units and strong technical force. This chapter focuses on the utilization of bamboo resources such as food, roofs and walls of houses, fences, and domestic and agricultural implements such as water containers, food and drink container hats, arrows, quiver, etc. A total of 861 species and infraspecific taxa belonging to 43 genera have been reported and include 707 species, 52 varieties, 98 forma, and 4 hybrids, which are naturally distributed in 21 provinces. The national bamboo forest covers 6.01 million ha, including 4.43 million ha of Moso bamboo and 1.58 million ha of other bamboo species. As the country develops and new economic activities emerge, bamboo production has shifted from harsh processing, such as bamboo basket, to finished machining, such as bamboo flooring. The bamboo industry has attracted new opportunities as a new energy source, particularly renewable energy, and may be considered a lignocellulose substrate for bioethanol production because of its environmental benefits and high annual biomass yield
Arrayed van der Waals Vertical Heterostructures based on 2D GaSe Grown by Molecular Beam Epitaxy
Vertically stacking two dimensional (2D) materials can enable the design of
novel electronic and optoelectronic devices and realize complex functionality.
However, the fabrication of such artificial heterostructures in wafer scale
with an atomically-sharp interface poses an unprecedented challenge. Here, we
demonstrate a convenient and controllable approach for the production of
wafer-scale 2D GaSe thin films by molecular beam epitaxy. In-situ reflection
high-energy electron diffraction oscillations and Raman spectroscopy reveal a
layer-by-layer van der Waals epitaxial growth mode. Highly-efficient
photodetector arrays were fabricated based on few-layer GaSe on Si. These
photodiodes show steady rectifying characteristics and a relatively high
external quantum efficiency of 23.6%. The resultant photoresponse is super-fast
and robust with a response time of 60 us. Importantly, the device shows no sign
of degradation after 1 million cycles of operation. Our study establishes a new
approach to produce controllable, robust and large-area 2D heterostructures and
presents a crucial step for further practical applications
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