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537 results on '"Zhang, Yulei"'

1. A Design of Hadronic Calorimeter for DarkSHINE Experiment

Author

Wang, Zhen, Yuan, Rui, Liu, Hanqing, Chen, Xiang, Li, Shu, Liu, Kun, Liu, Qibin, Song, Siyuan, Sun, Tong, Wang, Yufeng, Yang, Haijun, Zhang, Junhua, Zhang, Yulei, Zhao, Zhiyu, Zhu, Chunxiang, Zhu, Xuliang, and Zhu, Yifan

Subjects
Physics - Instrumentation and Detectors
Abstract

The sensitivity of the dark photon search through invisible decay final states in low background experiments significantly relies on the neutron and muon veto efficiency, which depends on the amount of material used and the design of detector geometry. This paper presents an optimized design of a hadronic calorimeter (HCAL) used for the DarkSHINE experiment, which is studied using a GEANT4-based simulation framework. The geometry is optimized by comparing a traditional design with uniform absorbers to one that uses different thicknesses at different locations of the detector, which enhances the efficiency of vetoing low-energy neutrons at the sub-GeV level. The overall size and total amount of material used in HCAL are optimized to be lower due to the load and budget requirements, while the overall performance is studied to meet the physical objectives., Comment: 12 pages, 9 figures

Published
2023
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5. Changes in epidermal waxy morphology and related properties of postharvest sweet cherry

Author

ZHANG Yulei, CUI Qingliang, WANG Yu, LIU Yaping, and ZHANG Yanqing

Subjects
sweet cherry, epidermal waxy morphology, contact angle, critical surface tension, Food processing and manufacture, TP368-456
Abstract

[Objective] This study aimed to reveal the reasons of different varieties for sweet cherry's storability and provide theoretical support and technical guidance for edible coating in its postharvest preservation. [Methods] Four representative sweet cherry varieties （Red Light, Rainey, Red Agate, and Friendship） were selected as research objects. The surface morphology of different varieties of sweet cherry skin, the contact angle of skin to different solutions, the changes of surface morphology, contact angle and critical surface tension of Red Agate sweet cherry during storage were investigated. [Results] There were differences in the distribution and morphology of wax on the epidermal of the four varieties of sweet cherry, and the contact angle of the skin to the same solution was significantly different. The wax content of the Red Agate epidermis decreased during storage. Due to the hydrophobicity of sweet cherry skin, adding Tween-20 as a surfactant to the coating liquid can significantly improve its surface wettability. The contact angle of the Red Agate epidermis to deionized water decreased during storage, and the critical surface tension increased with the extension of storage time. [Conclusion] The storability of different varieties of sweet cherries may be correlated with their skin characteristics. Adding 0.1% Tween-20 to the coating solution can make the solution more evenly coated on the surface of the sweet cherry.

Published
2024
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35. Export Competitiveness Enhancement Strategies for China’s Manufacturing Industry Based on Global Value Chains

Author

Zhang Yulei, Li Hui, Zhang Fan, and Zhang Hang

Subjects
nrca index, rca_va index, export competitiveness, trade value added, global value chain, 91b44, Mathematics, QA1-939
Abstract

The process of globalization is deepening, and the international division of labor has further evolved from the traditional pattern into the production mode of global value chains. This paper calculates the degree of participation in the global value chain of China’s manufacturing industry and analyzes the index of comparative explicit advantage of China’s manufacturing industry in each category, i.e., the NRCA index. The decomposition method of trade flows of intermediate goods is used to interpret the value added of trade based on the international input-output table. In accordance with OECD industrial classification, subdivide the manufacturing industries and evaluate the overall export competitiveness of China’s manufacturing industry. Propose the new explicit comparative advantage index (RCA_VA index) and carry out the overall measurement and the measurement of each technology level industry separately. From the point of view of the RCA_VA index of China’s manufacturing industry as a whole 1.29 < RCA_VA

Published
2024
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39. The Impact of the Coronavirus (COVID-19) Pandemic on Education: A Model toward Technology-Supported Synchronous Remote Learning

Author

Dang, Mandy Yan and Zhang, Yulei Gavin

Abstract

During the COVID-19 pandemic, many universities have moved a large portion of their classes online. To better support students' online learning activities and to best resemble the face-to-face setting, the technology-supported, synchronous remote learning platform was adopted in most cases. In this study, the authors aim to investigate factors that could influence students' learning in this new environment during the COVID-19 pandemic. Specifically, a research model was developed and tested with 428 students. The result showed that students' IT competence had a significant impact on their learning satisfaction, while social influence had a significant impact on their intention to use the remote learning technology in future classes. As to technology-facilitating conditions, significant impacts were found from it (at both institution and student levels) to learning satisfaction. They also found that COVID-19-related mental impacts could influence student satisfaction on and intention to use the remote learning technology.

Published
2022
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