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403 results on '"Wang, Kaiping"'

16. Ion-Exchange Separators Suppressing Self-Discharge in Polymeric Supercapacitors

Author

Wang, Kaiping, Yao, Lulu, Jahon, Mehran, Liu, Jiaxi, Gonzalez, Matthew, Liu, Ping, Leung, Vincent, Zhang, Xinyu, and Ng, Tse Nga

Subjects
Affordable and Clean Energy
Abstract

Supercapacitors offer superior cycle life and high power densities, but as energy storage devices, they are limited by self-discharge processes manifested as large potential decay and leakage current, resulting in loss of stored energy and low charging efficiency. To minimize Faradaic side reactions, this Letter has incorporated a sulfonate ion-exchange resin in separators to trap impurities and thereby suppress self-discharge in supercapacitors with PEDOT as redox electrodes. The versatile separator design is generally applicable to organic and aqueous electrolytes and compatible with a pH range of 0-14, while maintaining the device capacitance and rate performance. Temperature-dependent characteristics were analyzed to identify that the reduction of impurity concentration and diffusion was key to improve potential retention. Compared to devices using commercially available separators, the device here exhibited a lower leakage current and better charging efficiency. It was demonstrated to work with radio frequency energy-harvesting circuits and showed the potential to serve as an energy reservoir for wireless electronic applications.

Published
2020

18. A Platform to Study the Effects of Electrical Stimulation on Immune Cell Activation During Wound Healing.

Author

Wang, Kaiping, Parekh, Udit, Ting, Jonathan K, Yamamoto, Natasha AD, Zhu, Juan, Costantini, Todd, Arias, Ana Claudia, Eliceiri, Brian P, and Ng, Tse Nga

Subjects
Leukocytes, Animals, Mice, Inbred C57BL, Mice, Inflammation, Flow Cytometry, Equipment Design, Electric Stimulation, Wound Healing, Signal Transduction, Phosphorylation, electrical stimulation, flexible electrodes, phosphorylation proteins, wound healing, Stem Cell Research
Abstract

Wound healing is a complex process involving diverse changes in multiple cell types where the application of electric fields has been shown to accelerate wound closure. To define the efficacy of therapies based on electric fields, it would be valuable to have a platform to systematically study the effects of electrical stimulation (ES) upon the inflammation phase and the activation of signaling mediators. Here, an in vivo ES model in which flexible electrodes are applied to an animal model for monitoring inflammation in a wound is reported on. Subcutaneous implants of polyvinyl alcohol sponges elicit inflammation response as defined by the infiltration of leukocytes. The wound site is subjected to electric fields using two types of additively fabricated flexible electrode arrays. The sponges are then harvested for flow cytometry analysis to identify changes in the phosphorylation state of intracellular targets. This platform enables studies of molecular mechanisms, as it shows that an application of low-frequency ES ≤0.5 Hz increases phosphorylation of Erk proteins in recruited leukocytes, identifying a signaling pathway that is activated during the healing process.

Published
2019

24. Tripled-Uncertainty Guided Mean Teacher Model for Semi-supervised Medical Image Segmentation

Author

Wang, Kaiping, Zhan, Bo, Zu, Chen, Wu, Xi, Zhou, Jiliu, Zhou, Luping, Wang, Yan, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, de Bruijne, Marleen, editor, Cattin, Philippe C., editor, Cotin, Stéphane, editor, Padoy, Nicolas, editor, Speidel, Stefanie, editor, Zheng, Yefeng, editor, and Essert, Caroline, editor

Published
2021
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28. Stretchable Dry Electrodes with Concentric Ring Geometry for Enhancing Spatial Resolution in Electrophysiology

Author

Wang, Kaiping, Parekh, Udit, Pailla, Tejaswy, Garudadri, Harinath, Gilja, Vikash, and Ng, Tse Nga

Subjects
Engineering, Biomedical Engineering, Bioengineering, Elastic Modulus, Electric Impedance, Electrocardiography, Electrodes, Electroencephalography, Electromyography, Electrophysiology, Equipment Design, Equipment Failure Analysis, Printing, Three-Dimensional, Reproducibility of Results, Sensitivity and Specificity, Stress, Mechanical, electrophysiology, poly(3, 4-ethylenedioxythiophene) polystyrene sulfonate, printing, stretchable dry electrodes, Medicinal and Biomolecular Chemistry, Medical Biotechnology, Medical biotechnology, Biomedical engineering
Abstract

The multichannel concentric-ring electrodes are stencil printed on stretchable elastomers modified to improve adhesion to skin and minimize motion artifacts for electrophysiological recordings of electroencephalography, electromyography, and electrocardiography. These dry electrodes with a poly(3,4-ethylenedioxythiophene) polystyrene sulfonate interface layer are optimized to show lower noise level than that of commercial gel disc electrodes. The concentric ring geometry enables Laplacian filtering to pinpoint the bioelectric potential source with spatial resolution determined by the ring distance. This work shows a new fabrication approach to integrate and create designs that enhance spatial resolution for high-quality electrophysiology monitoring devices.

Published
2017

38. Spatial Spillover Effects of Urbanization on Ecosystem Services under Altitude Gradient.

Author

Yang, Xueliang, Wang, Kaiping, and Zhang, Yunlu

Subjects
URBANIZATION, ECOSYSTEM services, REGIONAL development, ALTITUDES
Abstract

Rapid urbanization has made mountain development an important means to alleviate the shortages of construction land on plains, which has significantly affected regional ecosystem services. In-depth research on the impact of urbanization on ecosystem services under altitude gradients is of great significance to clarify the relationship between the two. Based on data from 2000, 2010 and 2020, the urbanization level and ecosystem services of the study area were evaluated. The spatial correlation of ecosystem services was analyzed by Moran's I. A spatial Durbin model (SDM) was selected to fit the regression. The results show that (1) from 2000 to 2020, the ecosystem services in the study area displayed obvious regional characteristics and aggregation characteristics; (2) in plain areas, the indirect effects of economic, population and land urbanization have a greater negative impact, and compared with shallow mountain areas, deep mountain areas are more negatively affected by economic urbanization and land urbanization; and (3) the significant difference in regression results reflects the rationality of using the spatial Durbin model, as in this paper, and proves the scientific nature of regional coordinated development. The research results provide a reference for the future coordinated development of regional economies and environments. [ABSTRACT FROM AUTHOR]

Published
2024
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