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433 results on '"Liu, Weichao"'

1. Generation of optical toroidal vortex with circular asymmetric gratings

Author

Liu, Weichao, Cheng, Jie, and Wan, Chenhao

Subjects
Physics - Optics
Abstract

Toroidal vortex, a topological structure commonly observed in nature, exist in various types such as bubbles produced by dolphins and the air flow surrounding a flying dandelion. A toroidal vortex corresponds to a spatiotemporal wave packet in the shape of a donut that propagates in the direction perpendicular to the plane of the ring. In this work, we propose a circular asymmetric grating to generate vortex rings. A cylindrical vector wave packet is transformed by the device into a transmitted toroidal vortex pulse. Such a compact toroidal vortex generator may find applications in optical topology research and high-dimensional optical communications.

Published
2024

13. Analysis of contamination and pathogenic characteristics of Salmonella in the processing of pre-packed cooked meat products

Author

XU Beishuang, WANG Liyou, ZHANG Ya’nan, and LIU Weichao

Subjects
salmonella, cooked meat products, food processing chain, serotype, molecular typing, antibiotic susceptibility, Food processing and manufacture, TP368-456, Nutrition. Foods and food supply, TX341-641
Abstract

ObjectiveTo analyze the molecular characteristics and antibiotic susceptibility of Salmonella isolates and investigate the contamination of Salmonella in pre-packed cooked meat products during food processing.MethodsAccording to the sampling requirements of the national “Manual for Monitoring the Production and Processing of Cooked Meat Products （Pre-packed）”， 460 environmental and cooked meat samples were collected from a pre-packed cooked meat product factory in Dezhou from 2015 to 2017. Salmonella isolation and identification were performed per the currently effective GB 4789.4—2016 protocol. Salmonella serotypes were determined based on serum agglutination. Pulsed field gel electrophoresis （PFGE） and multilocus sequence typing （MLST） were employed to determine the molecular types of Salmonella isolates. Resistance tests for 15 antibiotics were performed using the broth microdilution susceptibility test.ResultsThe detection rate of Salmonella in 460 samples was 5.65% （26/460）. The detection rate in 2016 was the highest （7.65%， 14/183）， and the difference among samples from different years was not statistically significant （χ2=2.82， P>0.05）. The detection rate in intermediate products was the highest， and the difference among samples from different samples was statistically significant （χ2=64.16， P

Published
2023
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35. Research Progress on Mercury Ion Microwave Clock for Time Keeping

Author

Yan, Bibo, Liu, Hao, Chen, Yihe, Liu, Ge, Liu, Weichao, Wang, Jian, She, Lei, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Yang, Changfeng, editor, and Xie, Jun, editor

Published
2022
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47. Changes in Soil Aggregate Carbon Components and Responses to Plant Input during Vegetation Restoration in the Loess Plateau, China.

Author

Liang, Yaoyue, Fang, Jingbo, Jia, Wenjing, Wang, Shijie, Liu, Hanyu, Liu, Weichao, Zhang, Qi, Yang, Gaihe, Han, Xinhui, and Ren, Guangxin

Subjects
NEAR infrared spectroscopy, SOIL structure, CARBON in soils, BLACK locust, SOIL depth
Abstract

Vegetation restoration is an effective measure to cope with global climate change and promote soil carbon sequestration. However, during vegetation restoration, the turnover and properties of carbon within various aggregates change. The effects of plant source carbon input on surface soil and subsurface soil may be different. Thus, the characteristics of carbon components in aggregates are affected. Therefore, the research object of this study is the Robinia pseudoacacia forest located in 16–47a of the Loess Plateau, and compared with farmland. The change characteristics of organic carbon functional groups in 0–20 cm, 20–40 cm, and 40–60 cm soil layers were analyzed by Fourier near infrared spectroscopy, and the relationship between the chemical structure of organic carbon and the content of organic carbon components in soil aggregates was clarified, and the mechanism affecting the distribution of organic carbon components in soil aggregates was revealed in the process of vegetation restoration. The results show the following: (1) The stability of surface aggregates is sensitive, while that of deep aggregates is weak. Vegetation restoration increased the surface soil organic carbon content by 1.97~3.78 g·kg−1. (2) After vegetation restoration, the relative contents of polysaccharide functional groups in >0.25 mm aggregates were significantly reduced, while the relative contents of aromatic and aliphatic functional groups of organic carbon were significantly increased. The opposite is true for aggregates smaller than 0.25 mm. (3) With the increase in soil depth, the effect of litter on organic carbon gradually decreased, while the effect of root input on the accumulation of inert carbon in deep soil was more lasting. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Dexmedetomidine inhibited arrhythmia susceptibility to adrenergic stress in RyR2R2474S mice through regulating the coupling of membrane potential and intracellular calcium

Author

Li, Jianhong, primary, Luo, Fangyi, additional, Liu, Xueru, additional, Ou, Xianhong, additional, Liu, Ting, additional, Huang, Yong, additional, Liu, Weichao, additional, Yang, Yan, additional, Tan, Xiaoqiu, additional, Zhou, Shuzhi, additional, and Chen, Tangting, additional

Published
2024
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