This study proposes a network-based model with two parameters to find influential authors based on the idea that the prestige of a whole network changes when a node is removed. We apply the Katz-Bonacich centrality to define network prestige, which agrees with the idea behind the PageRank algorithm. We further deduce a concise mathematical formula to calculate each author's influence score to find the influential ones. Furthermore, the functions of two parameters are revealed by the analysis of simulation and the test on the real-world data. Parameter alpha provides useful information exogenous to the established network, and parameter beta measures the robustness of the result for cases in which the incompleteness of the network is considered. On the basis of the coauthor network of Paul Erdos, a comprehensive application of this new model is also provided. (C) 2014 Elsevier Ltd. All rights reserved.
Li, Yongli
Luo, Peng
Fan, Zhi-ping
Chen, Kun
Liu, Jiaguo
Utility analysis is introduced to develop the link prediction method. Link formation process is divided into meeting process and decision process. Expectation–Maximization is developed for parameter estimation. Logistic regression is a special case of the proposed method.
Disclosed are a method for comprehensively recycling a copper-nickel sulfide ore and a system thereof. Under normal pressure conditions, a copper-nickel sulfide ore concentrate can be directly leached out or a low nickel matte can be obtained by matte smelting the copper-nickel sulfide ore. During the leaching, the leaching ratio for nickel, cobalt and iron is up to 99% or more and hardly any copper is leached out, thereby directly achieving the deep separation of copper from elements such as nickel and cobalt and abolishing the colossal system for the separation of copper from nickel in traditional processes. At the same time, the precious metals are also not leached out and almost entirely remain in a leaching residue together with the copper. The method simplifies the smelting process of a copper-nickel sulfide ore and effectively achieves the recycling of nickel, copper, cobalt, precious metals and the element sulfur.
Similarity measurement for the network node has been paid increasing attention in the field of statistical physics. In this paper, we propose an entropy-based information loss method to measure the node similarity. The whole model is established based on this idea that less information loss is caused by seeing two more similar nodes as the same. The proposed new method has relatively low algorithm complexity, making it less time-consuming and more efficient to deal with the large scale real-world network. In order to clarify its availability and accuracy, this new approach was compared with some other selected approaches on two artificial examples and synthetic networks. Furthermore, the proposed method is also successfully applied to predict the network evolution and predict the unknown nodes' attributions in the two application examples. (C) 2014 Elsevier B.V. All rights reserved.
Li, Yongli
Lai, Ying-Mi
Lu, Yi
Yang, Yu-Liang
Chen, Shawn
Nocardiopsis alba is frequently isolated from environment and has recently been suggested as a casual symbiotic actinobacterium of diverse invertebrates. Using activity-guided fractionation, we purified two antibacterial cyclic dipeptides, cyclo(Delta Phe-Delta Leu) (albonoursin) and cyclo(Delta mTyr-Delta Leu), from a culture of Nocardiopsis alba ATCC BAA-2165. Analysis of N. alba genome revealed genetic information similar to albonoursin biosynthetic gene cluster, albABC. An albABC gene deletion mutant of N. alba was generated. Liquid chromatography-mass spectrometry analysis showed that the mutant could not produce the cyclic dipeptides. Cyclic dipeptide production in the mutant was restored by genetic complementation with the albABC cloned in a native plasmid of Nocardiopsis. beta-Glucuronidase reporter assays with a second mutant construct, in which albABC promoter is transcriptionally fused to the reporting gene gusA, indicated that albABC gene expression was subject to osmoregulation. The system presented will be used to study the metabolic and genetic control of cyclic dipeptide biosynthesis in Nocardiopsis.
A method for identifying a type of a fault on a power line comprises a step of calculating a fault point voltage at a fault point based on the terminal voltages and the fault location of the power line, a step of determining the fault point voltage corresponding to a maximum transition resistance as a setting value, a step of comparing the fault point voltage at the fault point with the setting value, and a step of identifying the type of the fault as a permanent type or a transient type based on the result of the comparison.
A method for recovery and production of ultrafine zinc powder from zinc-containing
dust involves steps as follows: adding zinc-containing dust into alkaline solution,
stirring the solution at the temperature 20?~60? and separating the solid and
the liquid after zinc is leached into the solution; primary electrolyzing the
obtained solution at the condition of a lower voltage and a lower current density
to reduce the metals whose electro-positivity is higher than that of zinc and
recovering the reduced metals; increasing the voltage and the current density
to electrolyze intensively the solution obtained after the primary electrolysis
so as to zinc powder being deposited on the cathode, and recycling the alkaline
solution to the leaching stage; treating the obtained zinc powder with highly
volatile liquid to dehydrolyze and dry it so as to obtaining pure and dry ultrafine
zinc powder with different particle diameters, and recycling the highly volatile
liquid; intensively leaching the metals that have not been leached by alkali
and recovering them as raw material in smelting, while recycling the leach solution
that contains lower content of zinc to the leaching stage.
Creat membership
Sweep WeChat yards
