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3,436 results on '"Wu, Weiwei"'

155. Investigation of different structures of screw extruders on the flow in direct ink writing SiC slurry based on LBM

Author

Deng Xu, Wu Weiwei, Ding Shuang, Zhang Yanjun, and Shi Binquan

Subjects
3d printing, lbm, ceramic slurry, flow analysis, special-shaped screw, Physics, QC1-999
Abstract

Direct ink writing provides a new method for ceramic material forming. The single-screw extruder is used here to extrude viscous SiC slurry. Because the flow mechanism of ceramic slurry in the slurry direct writing extrusion device is unclear, lattice Boltzmann method (LBM) is used to analyze the flow process of ceramic slurry in the extrusion device. In this study, three different types of special-shaped, single-screw extruders (constant depth variable pitch screw, variable depth constant pitch screw, and variable depth variable pitch screw) are investigated to explore the effects of the shapes on the flow process. Compared with the traditional single-screw extruder, more attention should be paid to the difference in the flow channel. The non-Newtonian rheological model of SiC slurry is built, then the LBM for the non-Newtonian slurry is introduced and used to conduct the simulations based on the aforementioned three different cases. The results show that the effect of constant depth and variable pitch screw on the flow of ceramic slurry is the least and the flow of ceramic slurry in variable depth and variable pitch screw is the most complex.

Published
2023
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166. Pensions and Late-Career Teacher Retention

Author

Kim, Dongwoo, Koedel, Cory, Kong, Wei, Ni, Shawn, Podgursky, Michael, and Wu, Weiwei

Abstract

Public school teachers retire much earlier than comparable professionals. Pension rule changes affecting new teachers can be used to close this gap in the long run, but any effects will not be observed for decades and the implications for workforce quality are unclear. This paper considers targeted incentive policies designed to deter retirement among senior, experienced high-need science and math teachers, as a policy to staff classrooms with qualified teachers and improve workforce quality. We use structural estimates from a dynamic retirement model to simulate the workforce effects of targeted late-career salary bonuses and deferred retirement plans (DROPs) using administrative data from Missouri. Although both policies produce additional teaching years at relatively low costs, by forcing teachers to reveal work-retirement preferences, DROPs generally yield incremental teacher years at lower cost per year. More generally, this work highlights the utility of using structural retirement models to analyze fiscal and workforce effects of changes to public sector pension plans, since the effects of pension rule changes cumulate over many years.

Published
2021
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187. Effect of geometry error on the non-Newtonian flow in the ceramic microchannel molded by SLA

Author

Zhang Jie, Gu Hai, Sun Jianhua, Li Bin, Jiang Jie, and Wu Weiwei

Subjects
geometry error, ceramic, microchannel, bingham fluids, Physics, QC1-999
Abstract

The ceramic microchannel manufactured by stereolithography (SLA) can be used in many engineering cases. SLA is an accurate 3D printing technology, while the small geometry error is inevitable. The involved flow is always non-Newtonian fluids. Therefore, it is necessary to analyze Bingham fluids flow in the ceramic microchannel with geometry errors. To conduct the numerical simulations, a modified lattice Boltzmann (LB) model is presented. Then, the good consistency between the theoretical and numerical solutions demonstrates the effectiveness of the improved method. The required cases are analyzed by using the proposed method. Both the streamlines and outlet velocity distribution show that the geometry error increases the outlet velocity. The Bingham parameters are important factors in the flow of the microchannel.

Published
2022
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188. A Case of Eosinophilic Pustular Folliculitis Misdiagnosed as Eczema

Author

Li,Yuan, Yang,Xianxu, Lu,Jiejie, Chen,Kai, Wu,Weiwei, Zhang,Ming, Li,Wanni, Li,Yuan, Yang,Xianxu, Lu,Jiejie, Chen,Kai, Wu,Weiwei, Zhang,Ming, and Li,Wanni

Abstract

Yuan Li,1,2 Xianxu Yang,3 Jiejie Lu,1 Kai Chen,3 Weiwei Wu,3 Ming Zhang,3 Wanni Li1 1Department of Cosmetic Dermatology, The Fifth People’s Hospital of Hainan Province, Haikou, Hainan, People’s Republic of China; 2Department of Dermatology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, People’s Republic of China; 3Department of Dermatology, The Fifth People’s Hospital of Hainan Province, Haikou, Hainan, People’s Republic of ChinaCorrespondence: Wanni Li, Department of Cosmetic Dermatology, The Fifth People’s Hospital of Hainan Province, No. 8 Longhua Road, Longhua District, Haikou, 570100, Hainan, People’s Republic of China, Email liwanni1204@outlook.comAbstract: Eosinophilic pustular folliculitis (EPF) is a rare skin disease. The typical skin lesions of classic EPF are localized on the upper limbs’ face, trunk, and extensor surfaces. However, when the skin lesions initially appear on the palms and soles, it is not easy to diagnose as EPF. Here, we report a case of a male patient who presented with erythematous plaques, pustules, and crusted erosions on the hands and feet, which were misdiagnosed as eczema ten years ago. Over ten years, the patient experienced recurrent erythematous patches with bumps and itching on the face, trunk, and extremities after improving the hand and foot lesions. A histopathological biopsy was performed to establish a definitive diagnosis, revealing pustules formed by eosinophilic infiltrates within the hair follicles. The diagnosis was confirmed as eosinophilic pustular folliculitis. The patient was treated with oral indomethacin at a dosage of 75mg/day, resulting in the disappearance of the skin lesions. After a 3-month follow-up, no recurrence was observed.Keywords: eosinophilic pustular folliculitis, indomethacin

Published
2024

189. Defining Solid Additive's Pivotal Role on Morphology Regulation in Organic Solar Cells Produced by Layer-by-layer Deposition

Author

Wu, Weiwei, Luo, Yongmin, Dela peña, Top Archie Padilla, Qammar, Menoona, Li, Mingjie, Yan, He, Wu, Jiaying, Ma, Ruijie, Li, Gang, Wu, Weiwei, Luo, Yongmin, Dela peña, Top Archie Padilla, Qammar, Menoona, Li, Mingjie, Yan, He, Wu, Jiaying, Ma, Ruijie, and Li, Gang

Abstract

Herein, two emerging device optimization methods, solid additive and layer-by-layer (LBL) process, for organic solar cells (OSCs) are simultaneously studied. Through traditional blend cast and recently proposed identical solvent LBL cast, BDCB (2-monobromo-1,3-dichloro-bezene), a benzene derivative, is used to improve the device performance based on celebrity combination PM6:L8-BO. The results reveal that finely optimized BDCB concentration in PM6 solution can push the efficiency of LBL to 19.03% compared to blend cast with only 18.12% while the power conversion efficiency (PCE) changing trend is determined by BDCB's ratio in L8-BO's precursor. The morphology characterizations confirm there exists no significant stratification for LBL-processed devices, supported by a previously reported swelling-intercalation-phase separation (SIPS) model. Thereby, the solid additive's 2D optimization is considered a smart strategy for finely tuning the SIPS process, which results in various final morphology states. This work not only reports a cutting-edge efficiency for binary OSCs, but also new insight and deep understanding for LBL method-based morphology optimization strategy development.

Published
2024

190. Federated Learning Based Distributed Algorithms for RF Fingerprinting Extraction and Identification of IoT Devices

Author

Wu, Weiwei, Hu, Su, Gao, Yuan, Cao, Jiang, Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin (Sherman), Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Wang, Xianbin, editor, Wong, Kai-Kit, editor, Chen, Shanji, editor, and Liu, Mingqian, editor

Published
2021
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192. Weight Forests-Based Learning Algorithm for Small-Scaled Data Processing

Author

Ren, Jiafu, Lin, Di, Wu, Weiwei, 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, 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, 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, Zhang, Junjie James, Series Editor, Wang, Wei, editor, Liu, Xin, editor, Na, Zhenyu, editor, Li, Xiaoxia, editor, and Zhang, Baoju, editor

Published
2021
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193. Optimal Quality of Information Service in an Electronic Commerce Website

Author

Wu, Weiwei, Lin, Di, 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, 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, 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, Zhang, Junjie James, Series Editor, Wang, Wei, editor, Liu, Xin, editor, Na, Zhenyu, editor, Li, Xiaoxia, editor, and Zhang, Baoju, editor

Published
2021
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194. Load Balance Analysis-Based Retrieval Strategy in a Heterogeneous File System

Author

Lin, Di, Wu, Weiwei, Qin, Yao, 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, 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, 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, Zhang, Junjie James, Series Editor, Wang, Wei, editor, Liu, Xin, editor, Na, Zhenyu, editor, Li, Xiaoxia, editor, and Zhang, Baoju, editor

Published
2021
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195. Network Data Processing Methods Based on Edge Computing

Author

Jian, Ying, Wu, Weiwei, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Xu, Zheng, editor, Parizi, Reza M., editor, Loyola-González, Octavio, editor, and Zhang, Xiaolu, editor

Published
2021
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196. Adaptive Uplink/Downlink Bandwidth Allocation for Dual Deadline Information Services in Vehicular Networks

Author

Li, Dong, Liu, Kai, Jin, Feiyu, Wu, Weiwei, Jiao, Xianlong, Guo, Songtao, 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, Liu, Zhe, editor, Wu, Fan, editor, and Das, Sajal K., editor

Published
2021
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197. Revenue Maximization of Electric Vehicle Charging Services with Hierarchical Game

Author

Wu, Biwei, Zhu, Xiaoxuan, Liu, Xiang, Jin, Jiahui, Xiong, Runqun, Wu, Weiwei, 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, Liu, Zhe, editor, Wu, Fan, editor, and Das, Sajal K., editor

Published
2021
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