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406 results on '"Han, Guangting"'

36. A theoretical analysis of local thermal equilibrium in fibrous materials

Author

Tian, Mingwei, Pan, Ning, Qu, Lijun, Guo, Xiaoqing, and Han, Guangting

Subjects
porous fibrous media, local thermal equilibrium, boundary conditions, material property and structure, Chemical Engineering, Mechanical Engineering, Resources Engineering and Extractive Metallurgy, Energy
Abstract

The internal heat exchange between each phase and the local thermal equilibrium scenarios in multi-phase fibrous materials are considered in this paper. Based on the two-phase heat transfer model, a criterion is proposed to evaluate the local thermal equilibrium condition, using derived characteristic parameters. Furthermore, the local thermal equilibrium situations in isothermal/adiabatic boundary cases with two different heat sources (constant heat flux and constant temperature) are assessed as special transient cases to test the proposed criterion system, and the influence of such different cases on their local thermal equilibrium status are elucidated. In addition, it is demonstrated that even the convective boundary problems can be generally estimated using this approach. Finally, effects on local thermal equilibrium of the material properties (thermal conductivity, volumetric heat capacity of each phase, sample porosity, and pore hydraulic radius) are investigated, illustrated, and discussed in our study.

Published
2015

39. Doped Carbon Dots Enable Highly Efficient Multiple‐Color Room Temperature Phosphorescence.

Author

Wang, Xiaohan, Han, Yuanyuan, Li, Weihua, Li, Junzhi, Ren, Shihuan, Wang, Maorong, Han, Guangting, Yu, Jianyong, Zhang, Yuanming, and Zhao, Haiguang

Subjects
QUANTUM dots, PHOSPHORESCENCE, COLLOIDAL carbon, OPTOELECTRONIC devices, CARBON, INFORMATION storage & retrieval systems, PHOSPHORIMETRY, PHOSPHORESCENCE spectroscopy
Abstract

Colloidal carbon dots (C‐dots) are considered as promising heavy‐metal‐free materials to achieve room‐temperature phosphorescence (RTP) properties for promising applications, such as photoelectronic devices, information encryption, and bio‐imaging. However, most of the current obtained RTP C‐dots have a short lifetime with a relatively low quantum yield (QY). In this work, the C‐dots large‐scale synthesized via a vacuum heating approach have multiple RTP emissions (blue, green, and yellow), a long RTP lifetime of as high as 1.92 s, and a high QY of 34.4% by selecting different types of precursors, which is superior to most of reported RTP C‐dots. The multiple atoms doping and strong bonding between neighbored C‐dots promoted by vacuum heating contributes to the excellent RTP properties. As a proof‐of‐concept, the as‐obtained RTP C‐dots are used as optical ink for flexible security codes, exhibiting a bright shape with a lifetime of 1.37 s. This work offers an efficient approach for producing large‐scale high‐quality RTP C‐dots, which can be applied to anti‐counterfeiting and information encryption systems. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Study of sliver irregularity caused by fiber acceleration motion during the drafting process.

Author

Liu, Yanhui, Zhu, Guoqing, Zhong, Jun, Han, Guangting, Xing, Mingjie, and Sun, Na

Subjects
FIBERS, RAW materials
Abstract

During the drafting process, the fiber acceleration motion contributes significantly to the sliver irregularity. In this study, the drafting simulation based on the improved model of fiber arrangement in the sliver was developed to analyze the sliver irregularity caused by the acceleration motion during the drafting process. The results indicated that the drafting simulation could provide an effective reference for the parameter optimization of the drafting process under the condition of saving raw material cost and time cost. The simulations and calculations denoted that a shorter gauge length and larger input sliver linear density by more concentrated accelerated motion could be conducive to more even slivers during the drafting process. In addition, in order to generate higher sliver evenness, in the double-zone drafting process, the draft ratio of the back drafting zone should be selected to be slightly greater than 1 so that the draft ratio of the front drafting zone would be relatively large when the total draft ratio is constant due to the trend of the additional irregularity caused by the acceleration motion increasing to a peak value firstly and then decreasing as the draft ratio grows. [ABSTRACT FROM AUTHOR]

Published
2024
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