Search

Your search keyword '"Xu, Yuan-Hao"' showing total 19 results
Start Over Author "Xu, Yuan-Hao"
19 results on '"Xu, Yuan-Hao"'

4. Impact of population size on epidemic spreading in a bipartite metapopulation network with recurrent mobility.

Author

Wang, Hao-Jie, Xu, Yuan-Hao, Li, Ming, and Hu, Mao-Bin

Subjects
*BIPARTITE graphs, *EPIDEMICS, *PUBLIC spaces
Abstract

The mobility pattern of a population plays a key role in the spread of epidemics. Despite extensive work on epidemic spreading, little attention has been paid to the impact of subpopulation size. This paper investigates the spread of epidemics on a bipartite metapopulation network considering recurrent mobility patterns and different sizes of subpopulations. With the Markovian process approach, the epidemic threshold can be predicted as a function of subpopulation size and epidemic parameters. Simulation and theoretical results indicate that there exists a critical mobility intensity below which the epidemic will be eliminated, while limiting the size of the subpopulation can suppress the epidemic. Additionally, the epidemic threshold will approach zero when the size of the public area is large. The results can help the prevention of epidemic spreading under recurrent crowd mobility. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

10. Diversity and dynamics of endosymbionts in a single population of sweet potato weevil, Cylas formicarius (Coleoptera: Brentidae): a preliminary study.

Author

Xu, Jin, Tan, Jian-Bin, Li, Yi-Dan, Xu, Yuan-Hao, Tang, An, Zhou, Hong-Kai, and Shi, Pei-Qiong

Subjects
CURCULIONIDAE, SWEET potatoes, BEETLES, BIOLOGICAL fitness, INSECT hosts, RICKETTSIA
Abstract

Endosymbionts live symbiotically with insect hosts and play important roles in the evolution, growth, development, reproduction, and environmental fitness of hosts. Weevils are one of the most abundant insect groups that can be infected by various endosymbionts, such as Sodalis , Nardonella , and Wolbachia. The sweet potato weevil, Cylas formicarius (Coleoptera: Brentidae), is a notorious pest in sweet potato (Ipomoea batatas L.) cultivation. Currently, little is known about the presence of endosymbionts in C. formicarius. Herein, we assessed the endosymbiont load of a single geographic population of C. formicarius. The results showed that Nardonella and Rickettsia could infect C. formicarius at different rates, which also varied according to the developmental stages of C. formicarius. The relative titer of Nardonella was significantly related to C. formicarius developmental stages. The Nardonella -infecting sweet potato weevils were most closely related to the Nardonella in Sphenophorus levis (Coleoptera, Curculionidae). The Rickettsia be identified in bellii group. These results preliminarily revealed the endosymbionts in C. formicarius and helped to explore the diversity of endosymbionts in weevils and uncover the physiological roles of endosymbionts in weevils. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

13. Preparation and Characterization of Fluorescent Hybrid Nanospheres of SiO2/Rhodamine B via Microemulsion

Author

朱小飞 Zhu Xiao-fei, 宋秋生 Song Qiu-sheng, and 徐园好 Xu Yuan-hao

Subjects
Radiation, Materials science, Heat resistance, Condensed Matter Physics, Fluorescence, Electronic, Optical and Magnetic Materials, Rhodamine, chemistry.chemical_compound, Chemical bond, chemistry, Rhodamine B, Microemulsion, Fourier transform infrared spectroscopy, Nuclear chemistry
Abstract

Fluorescent hybrid nanospheres of SiO2/Rhodamine B were prepared.Firstly,3-glycidyloxypropyl trimethoxysilane(KH560) reacted with Rhodamine B in water-in-oil microemulsion,and then they reacted with TEOS in the microemulsion by sol-gel in-situ.The hybrid nanospheres were characterized by FTIR,UV-Vis,TG,PL and TEM.The results showed that Rhodamine B was linked to SiO2 via chemical bond,the diameter of hybrid nanospheres was about 200 nm.The nanospheres showed better heat resistance and UV light resistance than Rhodamine B.The PL intensity of the hybrid nanospheres was about 4 times of Rhodamine B.

Published
2011

16. Research on Technical Principle of Active Knowledge Push

Author

Xu Yuan-hao

Subjects
Engineering, Technical feasibility, Engineering management, Workflow, Knowledge management, Product design, business.industry, media_common.quotation_subject, System framework, Quality (business), business, media_common
Abstract

Method of active knowledge push based on capturing intention of collaboration was proposed aiming at the problem of low quality and efficiency in acquiring knowledge for collaborative product design. First of all, distributed model of capturing intention of collaboration was constructed through study on the relations between the capturing intentions of collaboration and the designers’ behaviors. Then, the system framework and workflow of knowledge push based on capturing intention of collaboration were constructed. Finally, these methods were applied to engineering practices to validate its technical feasibility and effectiveness.

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results