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373 results on '"Gong Gu"'

1. Armor for Steel: Facile Synthesis of Hexagonal Boron Nitride Films on Various Substrates

Author

Ivan Vlassiouk, Sergei Smirnov, Alexander Puretzky, Olugbenga Olunloyo, David B. Geohegan, Ondrej Dyck, Andrew R. Lupini, Raymond R. Unocic, Harry M. Meyer III, Kai Xiao, Dayrl Briggs, Nickolay Lavrik, Jong Keum, Ercan Cakmak, Sumner B. Harris, Marti Checa, Liam Collins, John Lasseter, Reece Emery, John Rayle, Philip D. Rack, Yijing Stehle, Pavan Chaturvedi, Piran R. Kidambi, Gong Gu, and Ilia Ivanov

Subjects
2D materials, anticorrosion, CVD, hBN, oxidation protection, single crystals, Physics, QC1-999, Technology
Abstract

Abstract While hexagonal boron nitride (hBN) has been widely used as a buffer or encapsulation layer for emerging electronic devices, interest in utilizing it for large‐area chemical barrier coating has somewhat faded. A chemical vapor deposition process is reported here for the conformal growth of hBN on large surfaces of various alloys and steels, regardless of their complex shapes. In contrast to the previously reported very limited protection by hBN against corrosion and oxidation, protection of steels against 10% HCl and oxidation resistance at 850 °C in air is demonstrated. Furthermore, an order of magnitude reduction in the friction coefficient of the hBN coated steels is shown. The growth mechanism is revealed in experiments on thin metal films, where the tunable growth of single‐crystal hBN with a selected number of layers is demonstrated. The key distinction of the process is the use of N2 gas, which gets activated exclusively on the catalyst's surface and eliminates adverse gas‐phase reactions. This rate‐limiting step allowed independent control of activated nitrogen along with boron coming from a solid source (like elemental boron). Using abundant and benign precursors, this approach can be readily adopted for large‐scale hBN synthesis in applications where cost, production volume, and process safety are essential.

Published
2024
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2. Phase segregation mechanisms of small molecule‐polymer blends unraveled by varying polymer chain architecture

Author

Jihua Chen, Sanjib Das, Ming Shao, Guoliang Li, Huada Lian, Jian Qin, James F. Browning, Jong K. Keum, David Uhrig, Gong Gu, and Kai Xiao

Subjects
neutron reflectivity, organic field‐effect transistors, phase separation, polymer binders, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Abstract As phase separation between the small‐molecule semiconductor and the polymer binder is the key enabler of blend‐based organic field‐effect transistors (OFETs) fabricated by low‐cost solution processing, it is crucial to understand the underlying phase separation mechanisms that determine the phase morphology, which significantly impacts device performance. Beyond the parameter space investigated in previous work, here we investigate the formation of blends by varying the branch architecture of the polymer binder and by shortening the solvent dry time using ultrasonic spray casting. The phase morphologies of the resulting blend films have been thoroughly characterized with a variety of techniques in three dimensions over multiple length scales, including AFM, energy‐filtered transmission electron microscope, and neutron reflectivity, and have been correlated with electrical transport performance. From the results, we have inferred that the phase morphology is kinetically determined, limited by the inherent slow movement of polymer macromolecules. The kinetic picture, supported by molecular dynamics modeling, not only consistently explains our observations but also resolves inconsistencies in previous works. The achieved mechanistic understanding will guide further optimization of blend‐based organic electronics, such as OFETs and organic photovoltaics.

Published
2021
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3. Model Quantization and Hardware Acceleration for Vision Transformers: A Comprehensive Survey

Author

Du, Dayou, Gong, Gu, and Chu, Xiaowen

Subjects
Computer Science - Machine Learning, Computer Science - Artificial Intelligence, Computer Science - Hardware Architecture, Computer Science - Computer Vision and Pattern Recognition, Computer Science - Performance
Abstract

Vision Transformers (ViTs) have recently garnered considerable attention, emerging as a promising alternative to convolutional neural networks (CNNs) in several vision-related applications. However, their large model sizes and high computational and memory demands hinder deployment, especially on resource-constrained devices. This underscores the necessity of algorithm-hardware co-design specific to ViTs, aiming to optimize their performance by tailoring both the algorithmic structure and the underlying hardware accelerator to each other's strengths. Model quantization, by converting high-precision numbers to lower-precision, reduces the computational demands and memory needs of ViTs, allowing the creation of hardware specifically optimized for these quantized algorithms, boosting efficiency. This article provides a comprehensive survey of ViTs quantization and its hardware acceleration. We first delve into the unique architectural attributes of ViTs and their runtime characteristics. Subsequently, we examine the fundamental principles of model quantization, followed by a comparative analysis of the state-of-the-art quantization techniques for ViTs. Additionally, we explore the hardware acceleration of quantized ViTs, highlighting the importance of hardware-friendly algorithm design. In conclusion, this article will discuss ongoing challenges and future research paths. We consistently maintain the related open-source materials at https://github.com/DD-DuDa/awesome-vit-quantization-acceleration.

Published
2024

4. Environmental target image recognition of coal mine rescue robot

Author

GONG Gu and ZHU Hua

Subjects
coal mine rescue robot, autonomous mobile, object recognition, feature point matching, scale-invariant feature transform algorithm, mahalanobis distance, Mining engineering. Metallurgy, TN1-997
Abstract

In view of problems that traditional scale-invariant feature transform（SIFT） algorithm has calculation redundancy in searching key points of vision images and poor real-time performance in target recognition, an improved SIFT algorithm was proposed which was applied to coal mine rescue robot to realize environmental information perception and target recognition matching. The improved SIFT algorithm adopts Mahalanobis distance to replace Euclidean distance in the traditional SIFT algorithm and simplifies extraction of the image feature points, avoids mismatching of feature point. The field test results show that the improved SIFT algorithm improves real-time performance in underground environmental target recognition and accuracy of target matching of coal mine rescue robot, which makes visual premise for realizing obstacle-avoidance and walking of coal mine rescue autonomous robot.

Published
2017
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5. A Microscopic Damage Analysis Model for the Matrix of 8Cr4Mo4V Alloy

Author

Ma, TianYu, Gong, Gu, Cao, HongRui, Shi, JiangHai, Wei, XunKai, Zhang, LiJun, Ceccarelli, Marco, Series Editor, Corves, Burkhard, Advisory Editor, Glazunov, Victor, Advisory Editor, Hernández, Alfonso, Advisory Editor, Huang, Tian, Advisory Editor, Jauregui Correa, Juan Carlos, Advisory Editor, Takeda, Yukio, Advisory Editor, Agrawal, Sunil K., Advisory Editor, Wang, Zuolu, editor, Zhang, Kai, editor, Feng, Ke, editor, Xu, Yuandong, editor, and Yang, Wenxian, editor

Published
2025
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10. Energy Gap Induced by Friedel Oscillations Manifested as Transport Asymmetry at Monolayer-Bilayer Graphene Boundaries

Author

Kendal W. Clark, X.-G. Zhang, Gong Gu, Jewook Park, Guowei He, R. M. Feenstra, and An-Ping Li

Subjects
Physics, QC1-999
Abstract

We show that Friedel charge oscillation near an interface opens a gap at the Fermi energy for electrons with wave vectors perpendicular to the interface. If the Friedel gaps on two sides of the interface are different, a nonequilibrium effect—shifting of these gaps under bias—leads to asymmetric transport upon reversing the bias polarity. The predicted transport asymmetry is revealed by scanning tunneling potentiometry at monolayer-bilayer interfaces in epitaxial graphene on SiC(0001). This intriguing interfacial transport behavior opens a new avenue toward novel quantum functions such as quantum switching.

Published
2014
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25. Design and synthesis of ligustrazine derivatives as potential anti-Alzheimer's agents.

Author

Chen, Xu-fei, Li, Shan-shan, Bai, Yu-jun, Zhao, Ze-feng, Bai, Ya-jun, Gong, Gu, He, Xi-rui, and Zheng, Xiao-hui

Subjects
ACETYLCHOLINESTERASE, ALZHEIMER'S disease, MOLECULAR docking, BINDING sites, CHEMICAL synthesis, LEAD compounds
Abstract

A novel series of ligustrazine derivatives was designed, synthesized, and evaluated as acetylcholinesterase (AChE) and butylcholinesterase (BuChE) inhibitors for the treatment of Alzheimer's disease (AD). In vitro studies displayed that some of the synthesized compounds revealed promising AChE and BuChE inhibitory effects. Particularly, compounds E12 and E27, indicated highly AChE inhibitory activity with IC50 values of 1.85 μM and 0.98 μM, respectively and showed noteworthy protective effects against on glutamate-induced SH-SY5Y cells damage at 1 μM and 10 μM concentrations. Furthermore, molecular simulation docking elucidates compounds E12 and E27 interacting with residues in the binding site of AChE (PDB code: 4EY7) and BuChE (PDB code: 1P0I), emphasizing the protein residues that participate in the main interactions with the two targets. Taken together, these results revealed that compounds E12 and E27 might be potential lead compounds for further structure optimization in the drug-discovery process against AD. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Administration of combined spinal epidural anesthesia with ultrasound-assisted positioning in obese patients undergoing open hysterectomy: A randomized controlled trial

Author

Yang, Haihong, primary, Zhang, Qin, additional, Zhong, Zuling, additional, Sun, Yangyang, additional, Gong, Huaqu, additional, Liu, Yinghai, additional, Dai, Xuemei, additional, Lin, Lu, additional, Luo, Jingya, additional, Gong, Gu, additional, and Yang, Yongjian, additional

Published
2023
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33. Effect of Repeated Intranasal Administration of Different Doses of Insulin on Postoperative Delirium, Serum τ and Aβ Protein in Elderly Patients Undergoing Radical Esophageal Cancer Surgery

Author

Huang,Qingqing, Shi,Qin, Yi,Xiaobo, Zeng,Jingzheng, Dai,Xuemei, Lin,Lu, Yang,Yanling, Wu,Xiao, Gong,Gu, Huang,Qingqing, Shi,Qin, Yi,Xiaobo, Zeng,Jingzheng, Dai,Xuemei, Lin,Lu, Yang,Yanling, Wu,Xiao, and Gong,Gu

Abstract

Qingqing Huang,1 Qin Shi,2 Xiaobo Yi,1 Jingzheng Zeng,2 Xuemei Dai,1 Lu Lin,1 Yanling Yang,1 Xiao Wu,2 Gu Gong1 1Department of Anesthesiology, The General Hospital of Western Theater Command, Chengdu, People’s Republic of China; 2Department of Anesthesiology, North Sichuan Medical College, Nanchong, People’s Republic of ChinaCorrespondence: Gu Gong, Department of Anesthesiology, The General Hospital of Western Theater Command, 270 Tianhui Road, Rongdu Avenue, Jinniu District, Chengdu, Sichuan, 610083, People’s Republic of China, Tel +8617360137572, Fax +86 28570423, Email gonggu68@163.comObjective: Postoperative delirium is common after general anesthesia in older patients. However, there are currently no effective preventive measures. This study investigated the effect of repeated intranasal administration of different insulin doses before surgery on postoperative delirium in older patients with esophageal cancer, and the possible mechanism for its efficacy.Methods: In this randomized, placebo-controlled, double-blind, parallel-group study, 90 older patients were randomly assigned to either a Control (normal saline), Insulin 1 (20 U/0.5 mL intranasal insulin), or Insulin 2 (30 U/0.75 mL intranasal insulin) group. Delirium was assessed on postoperative days 1 (T2), 2 (T3), and 3 (T4) using the Confusion Assessment Method for the Intensive Care Unit. Serum τ and Aβ protein levels were measured at T0 (before insulin/saline administration), T1 (end of surgery), T2, T3 and T4.Results: The Insulin 2 group had a significantly lower prevalence of delirium compared to the Control and Insulin 1 groups three days after surgery. Compared to baseline, τ and Aβ protein levels increased significantly at T1–T4. Compared to the Control group, the Insulin 1 and 2 groups had significantly lower τ and Aβ protein levels at T1–T4, and the Insulin 2 group had significantly lower levels than the Insulin 1 group at T1–T2.Conclusion: The administration of 30 U of intranasa

Published
2023

37. Organocatalytic cycloaddition of alkynylindoles with azonaphthalenes for atroposelective construction of indole-based biaryls

Author

Hui Yang, Huai-Ri Sun, Rui-Qing He, Le Yu, Wei Hu, Jie Chen, Sen Yang, Gong-Gu Zhang, and Ling Zhou

Subjects
Multidisciplinary, Science, General Physics and Astronomy, General Chemistry, General Biochemistry, Genetics and Molecular Biology
Abstract

The axially chiral indole-aryl motifs are present in natural products and biologically active compounds as well as in chiral ligands. Atroposelective indole formation is an efficient method to construct indole-based biaryls. We report herein the result of a chiral phosphoric acid catalyzed asymmetric cycloaddition of 3-alkynylindoles with azonaphthalenes. A class of indole-based biaryls were prepared efficiently with excellent yields and enantioselectivities (up to 98% yield, 99% ee). Control experiment and DFT calculations illustrate a possible mechanism in which the reaction proceeds via a dearomatization of indole to generate an allene-iminium intermediate, followed by an intramolecular aza-Michael addition. This approach provides a convergent synthetic strategy for enantioselective construction of axially chiral heterobiaryl backbones.

Published
2022

41. Phase segregation mechanisms of small molecule‐polymer blends unraveled by varying polymer chain architecture

Author

Jian Qin, Ming Shao, David Uhrig, Gong Gu, Jong K. Keum, Guoliang Li, Huada Lian, James F. Browning, Sanjib Das, Jihua Chen, and Kai Xiao

Subjects
chemistry.chemical_classification, Materials science, neutron reflectivity, organic field‐effect transistors, Polymer, Small molecule, polymer binders, Chemical engineering, Chain (algebraic topology), chemistry, Phase (matter), TA401-492, Polymer blend, phase separation, Materials of engineering and construction. Mechanics of materials
Abstract

As phase separation between the small‐molecule semiconductor and the polymer binder is the key enabler of blend‐based organic field‐effect transistors (OFETs) fabricated by low‐cost solution processing, it is crucial to understand the underlying phase separation mechanisms that determine the phase morphology, which significantly impacts device performance. Beyond the parameter space investigated in previous work, here we investigate the formation of blends by varying the branch architecture of the polymer binder and by shortening the solvent dry time using ultrasonic spray casting. The phase morphologies of the resulting blend films have been thoroughly characterized with a variety of techniques in three dimensions over multiple length scales, including AFM, energy‐filtered transmission electron microscope, and neutron reflectivity, and have been correlated with electrical transport performance. From the results, we have inferred that the phase morphology is kinetically determined, limited by the inherent slow movement of polymer macromolecules. The kinetic picture, supported by molecular dynamics modeling, not only consistently explains our observations but also resolves inconsistencies in previous works. The achieved mechanistic understanding will guide further optimization of blend‐based organic electronics, such as OFETs and organic photovoltaics.

Published
2021

43. Microsatellite records for volume 8, issue 1

Author

Arias, Maria Cristina, Aulagnier, Stéphane, Baerwald, Erin F., Barclay, Robert M. R., Batista, Jacqueline Silva, Beasley, Rochelle R., Bezerra, Rodrigo A., Blanc, Frédéric, Bridge, Eli S., Cabria, Maria Teresa, Caputo, Lívia Izabela, Chen, Jie, Chen, Jian-Hua, Chen, Zhi, Chen, Ching-Hung, Chu, Pengfei, Contina, Andrea, da Silva Carmo, Fausto Moreira, de Carvalho, Leiliane Campos, de Freitas Viana, Priscila Maria, de Macêdo, Jeferson Luis Vasconcelos, de Menezes Yazbeck, Gabriel, de Oliveira Teixeira, Zélia, de Souza Araujo, Natália, Dequigiovanni, Gabriel, Ding, Shaoxiong, Dos Santos, Priscila Karla Ferreira, Ernest, Holly B., Feng, Yan-Wei, Formiga, Kyara Martins, Fournier-Chambrillon, Christine, Françoso, Elaine, Fu, Yaru, Gagne, Roderick B., Gaiotto, Fernanda A., Gao, Tian-xiang, Ge, Hongzi, Ge, Taiming, Gillet, François, Gong, Yun, Gong, Hong-mei, Guo, Qiqiang, Guo, Liang, Guo, Liang, Harrigan, Ryan J., He, Libo, House, Carrie J., Der Hsiao, Chung-, Huang, Rong, Iyengar, Arati, Jiang, Xiayun, Jiang, Hai-Lin, Johnson, Tania A., Jones, Kenneth L., Kageyama, Paulo Yoshio, Kelly, Jeffrey F., Lam, Lydia, Lance, Stacey L., Li, Hong, Li, Cheng, Li, Fugui, Li, Huie, Li, Shaoke, Li, Yongming, Li, Mingming, Li, Mingming, Li, Fuhua, Li, Wei-guo, Li, Jitao, Li, Jian, Li, Xinru, Liang, Kai, Liang, Yaosi, Liao, Fuchu, Liao, Lanjie, Lin, Haoran, Lin, Haoran, Lin, Haoran, Lin, Qiang, Liu, Hong, Liu, Honggao, Liu, Lu, Liu, Xiang-Quan, Liu, Ping, Liu, Chen, Liu, Xin, Lopes, Maria Teresa Gomes, Lu, Danqi, Luan, Ming-Bao, Luo, Wei, Meng, Zining, Meng, Zining, Michaux, Johan R., Némoz, Mélanie, Pollinger, John P., Qiao, Ye, Qu, Hongyue, Ramos, Santiago Linorio Ferreyra, Le Roux, Stephné, Santiago, Leandro Rodrigues, Shao, Xiaoyan, Shen, Kang-Ning, Shen, Heding, Shen, Hao, Smith, Thomas B., Song, Dang-yu, Sourp, Eric, Sun, Yiwen, Tang, Huiyuan, Tang, Qing, Tong, Yiqin, van den Einden, Marion, van Hoppe, Moniek J. C., Veasey, Elizabeth Ann, Vial-Novella, Corinne, Wan, Li, Wang, Xiaojun, Wang, Yiming, Wang, Yu, Wang, Yaping, Wang, Ruoran, Wang, Xin, Wang, Rifang, Wang, Quanchao, Wang, Guo-dong, Wang, Jiajia, Wang, Dongfeng, Wang, Peipei, Wei, Xiu-Mei, Wen, Yanfei, Wen, Haishen, Wu, Xue-Ping, Wu, Xin, Xiang, Jianhai, Xie, Zhenzhen, Xu, Zhanning, Xu, Pao, Yang, Zhi, Yang, Sen, Yang, Sen, Yin, Cece, Yin, Shaowu, Yin, Shaowu, Yu, Yang, Yuan, Xiping, Yue, Gen Hua, Zang, Gong-Gu, Zardoya, Rafael, Zhang, Li-hui, Zhang, Xiaojun, Zhang, Yong, Zhang, Guosong, di Zhang, Yan-, Zhang, Hongye, Zhang, Guosong, Zhao, Jie, Zhao, Cheng, Zhu, Fei, Zhu, Hongchai, Zhu, Shilong, and Zou, Shuming

Published
2016
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47. Effect of Repeated Intranasal Administration of Different Doses of Insulin on Postoperative Delirium, Serum τ and Aβ Protein in Elderly Patients Undergoing Radical Esophageal Cancer Surgery.

Author

Huang, Qingqing, Shi, Qin, Yi, Xiaobo, Zeng, Jingzheng, Dai, Xuemei, Lin, Lu, Yang, Yanling, Wu, Xiao, and Gong, Gu

Subjects
OLDER patients, INTRANASAL administration, INSULIN therapy, GASTROINTESTINAL surgery, ESOPHAGEAL cancer, GLIAL fibrillary acidic protein, GENERAL anesthesia
Published
2023
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