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The unconditional uniqueness for the energy-supercritical NLS

ANNALS OF PDE 2022年第2期8卷 14页

作者： Chen, xuwen Shen, Shunlin zhang, Zhifei Univ Rochester Dept Math Rochester NY 14627 USA Peking Univ Sch Math Sci Beijing 100871 Peoples R China

We consider the cubic and quintic nonlinear Schrodinger equations (NLS) under the R-d and T-d energy-supercritical setting. Via a newly developed unified scheme, we prove the unconditional uniqueness for solutions to NLS at critical regularity for all dimensions. Thus, together with [19, 20], the unconditional uniqueness problems for H-1-critical and H-1-supercritical cubic and quintic NLS are completely and uniformly resolved at critical regularity for these domains. One application of our theorem is to prove that defocusing blowup solutions of the type in [54] is the only possible C([0,T);(H) over dot(sc)) solution if exist in these domains.

关键词： Energy-supercritical NLS Gross-Pitaevskii Hierarchy Klainerman-Machedon Board Game Multilinear Estimates

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Treatment of Keloids in A Child with Surgery Alone:Clinical Application of the LBD Suturing Technique

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Chinese Journal of Plastic and Reconstructive Surgery 2021年第1期3卷 46-50页

作者： Yong zhang xuwen TANG Yang LIU Dongyun YANG Department of Chongqing Kewei Scar Medical Institute/Dongshang Medical Aesthetic Clinic Chongqing 400038China

Keloids are fibroproliferative disorders that can result from cutaneous injuries to the reticular *** rates as high as 100%have been reported following surgical excision ***,a variety of post-surgical techniques have been employed to prevent keloid recurrence,including the use of *** numerous studies have shown that post-excisional X-rays,electron beams,lasers,and brachytherapy can reduce the rate of keloid recurrence,numerous inconsistencies,including a wide range of definitions for keloid recurrence,render it difficult to compare the *** treatment of severe keloids in children is much more challenging,and there have been few previous *** is generally believed that children with keloids should be treated with nonsurgical treatment such as hormone injections and *** severe keloids,these methods require a long treatment period,and their efficacy is not ***,the side effects of the treatment can affect children’s *** keloid scars are not effectively treated,they will often seriously affect the physical and mental health of *** purpose of this review is to discuss case studies of children with severe keloids who were only treated with surgery and their postoperative *** this case,the deep-embedded circular mattress suture technique(LBD,the looped,broad,and deep buried suturing technique)was used in the scar *** 18 months of follow-up,the surgical scar was evaluated using the Vancouver Scar Scale(VSS).The scar was stable and did not *** child was *** case shows that it is completely feasible to treat severe keloids with surgery alone,as long as the tension is reduced during the operation to prevent surgical scar hyperplasia.

关键词： Keloid Child Scar resection Surgery LBD suturing technique Recurrence

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A machine learning ensemble model for predicting pavement conditions using automatic laser crack measurement data

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INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING 2023年第1期24卷

作者： Bai, Lihui zhang, Jie Zhu, xuwen Alam, Md Morshedul Sun, Zhihui Univ Louisville Dept Ind Engn Louisville KY 40292 USA FedEx Corp Memphis TN USA Univ Alabama Dept Informat Syst Stat & Management Sci Tuscaloosa AL USA Univ Louisville Dept Civil & Environm Engn Louisville KY USA

Automated pavement survey (APS) systems (e.g. Laser Crack Measurement System) are increasingly adopted by transportation planners as a data-enriching and economical alternative to the traditional windshield pavement survey (WPS) systems. Application arises where transportation planners wish to use APS measurements to predict WPS distress scores, as such prediction will enable them to continue using the WPS-based pavement asset management system while using the newly collected APS data. In this paper, we develop a machine learning model to predict the WPS pavement distress scores using APS variables, by employing decision tree classifier based ensemble learning model. The novelty is threefold. First, instead of using the mean we use the distributions of APS variables in the prediction, by examining multiple statistics for every APS variable. Second, these statistics are then used to develop decision tree classifiers as base learners in predicting WPS distress scores. Third, base learners are ensembled using various weight assignment strategies. Our computational test uses the WPS and APS data for two wheel path crack distress from the Kentucky roadway systems, and suggests that conditional probability-based weight assignment provides the best prediction with approximately 79% accuracy.

关键词： Automated pavement survey windshield pavement survey pavement condition pavement management system decision tree classifier ensemble model

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Looped,Broad,and Deep Buried Suturing Technique for Wound Closure

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Chinese Journal of Plastic and Reconstructive Surgery 2021年第2期3卷 85-88页

作者： xuwen TANG Yong zhang Liu YANG Dongyun YANG Department of Chongqing Kewei Scar Medical Institute/Dongshang Medical Aesthetic Clinic Chongqing 400038China

This study explores the clinical application of the circular wide and deep(looped,broad,and deep buried,LBD)suture technique for scar resection and examines its clinical effectiveness for scar *** June 2017 to March 2019,a total of 68 patients with scars were sutured using LBD technique,and recovery was achieved 24 months *** all 68 patients,postoperative scars were slightly evident in two cases of cervical scar,one case of leg scar,and one case of chest *** addition,the remaining 62 patients were completely satisfied with the *** LBD suturing technique could provide sustained and stable tension-reducing effects postoperatively and significantly improve scar formation in *** method is most applicable to incisions with ***,it should be more widely used for clinical scar treatment.

关键词： Suture technology Looped,broad,and deep buried suturing technique Scar resection Cosmetic technology

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Self-supervised Network Evolution for Few-shot Classification 30

Self-supervised Network Evolution for Few-shot Classificatio...

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30th International Joint Conference on Artificial Intelligence (IJCAI)

作者： Tang, xuwen Teng, Zhu zhang, Baopeng Fan, Jianping Beijing Jiaotong Univ Beijing Peoples R China Lenovo Res Res Triangle Pk NC USA

ISBN: (纸本)9780999241196

Few-shot classification aims to recognize new classes by learning reliable models from very few available samples. It could be very challenging when there is no intersection between the already-known classes (base set) and the novel set (new classes). To alleviate this problem, we propose to evolve the network (for the base set) via label propagation and self-supervision to shrink the distribution difference between the base set and the novel set. Our network evolution approach transfers the latent distribution from the already-known classes to the unknown (novel) classes by: (a) label propagation of the novel/new classes (novel set);and (b) design of dual-task to exploit a discriminative representation to effectively diminish the overfitting on the base set and enhance the generalization ability on the novel set. We conduct comprehensive experiments to examine our network evolution approach against numerous state-of-the-art ones, especially in a higher way setup and cross-dataset scenarios. Notably, our approach outperforms the second best state-of-the-art method by a large margin of 3.25% for one-shot evaluation over miniImageNet.

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A Novel Radius Measurement Method for Vertical Oil Tank Based on Laser Tracking and Wall-Climbing Robot 16th

A Novel Radius Measurement Method for Vertical Oil Tank Base...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Zu, Hongfei Ma, Junjun Li, Cunjun Chen, Xianlei Shi, Haolei Chen, xuwen zhang, Xiang Chen, zhangwei School of Mechanical Engineering Zhejiang Sci-Tech University Hangzhou310018 China Zhoushan Institute of Calibration and Testing for Qualitative and Technical Supervision Zhoushan316012 China Zhejiang Premax Co. Ltd. Ningbo315048 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou310058 China

ISBN: (纸本)9789819965007

In order to address the issue of low efficiency and poor accuracy in measuring the radius of large vertical oil tanks, a novel measurement method based on the combination of laser tracking and wall-climbing robot was proposed in this manuscript. To solve the problem of light interruption during the laser tracking measurement process, an active spherically mounted retroreflector (SMR) device that can automatically align the laser was designed. A wall-climbing robot equipped with the active target and temperature sensor was developed to crawl on the tank wall and collect four-dimensional point cloud data. And a self-written program based on the PCL point cloud processing library was adopted to fit and calculate the tank plate radius. Furthermore, multiple measurements were carried out on a vertical oil tank with a capacity of 1000 m3, and the average radius error was only 1.39 mm, which strongly verified the repeatability and feasibility of the method proposed in this manuscript. This method provides a more effective and accurate method for measuring the radius of oil tanks, and it is foreseeable that it will be a good supplement to existing methods. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Oil tanks

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Use of Triangular Silver Nanoplates as Low Potential Redox Mediators for Electrochemical Sensing

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ANALYTICAL CHEMISTRY 2021年第6期93卷 3295-3300页

作者： Gao, xuwen Dong, Shuangtian Fu, Li zhang, Bin Hsu, Hsien-Yi Zou, Guizheng Shandong Univ Sch Chem & Chem Engn Jinan 250100 Peoples R China City Univ Hong Kong Sch Energy Hong Kong 999077 Peoples R China City Univ Hong Kong Dept Mat Sci & Engn Hong Kong 999077 Peoples R China

Redox mediators can facilitate the electrochemical communication between targets and electrodes for material characterization and investigation. To provide an alternative to the chemical-based redox mediators, herein, we present a nanoparticle-based redox mediator, i.e., the trisodium citrates (TSC)-capped triangular silver nanoplates (Tri-Ag-NPTSC), which demonstrates an efficient oxidative process at around 0.13 V (vs Ag/AgCl) with acceptable redox reversibility by exploiting the interaction between the carbonyl group of TSC and the Ag element of Tri-Ag-NPTSC. The TSC of Tri-Ag-NPs can be selectively replaced by thiols and enable the obtained Tri-Ag-NPTSC-thol with changed electrochemical redox response, which could be utilized to determine various thiols at 0.13 V, a much lowered oxidative potential than traditional redox mediators, with a similar linear response range, response slope, and limit of detection (LOD). This work proposes a surface-engineering approach to design and develop electrochemical redox probes using Ag nanoparticles with particular morphology, indicating that the interaction between the carbonyl group and Ag nanoparticles might be extended to sensing application beyond the surface-enhanced Raman scattering.

关键词： Silver nanoparticle Thiol

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Impact of Oligo(Ethylene Glycol) Side Chains on the Thermoelectric Properties of Naphthalenediimide-Dialkoxybithiazole Polymers

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ACS MATERIALS LETTERS 2024年第4期6卷 1207-1215页

作者： Yang, xuwen Ye, Gang Tran, Karolina Liu, Yuru Cao, Jiamin Dong, Jingjin Portale, Giuseppe Liu, Jian zhang, Ping Loi, Maria Antonietta Chiechi, Ryan C. Koster, L. Jan Anton Univ Groningen Zernike Inst Adv Mat Nijenborgh 4 NL-9747 AG Groningen Netherlands Univ Groningen Stratingh Inst Chem Nijenborgh 4 NL-9747 AG Groningen Netherlands Hunan Univ Sci & Technol Sch Chem & Chem Engn Key Lab Theoret Organ Chem & Funct Mol Minist Educ Xiangtan 411201 Peoples R China Nanjing Tech Univ Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China Nanjing Tech Univ Inst Adv Mat IAM Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM Nanjing 211816 Jiangsu Peoples R China Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Polymer Phys & Chem Changchun 130022 Jilin Peoples R China Jiangxi Univ Sci & Technol Sch Elect Engn & Automat Ganzhou 341000 Jiangxi Peoples R China Hubei Univ Sch Mat Sci & Engn Key Lab Green Preparat & Applicat Funct Mat Hubei Key Lab Polymer Mat Wuhan 430062 Peoples R China North Carolina State Univ Dept Chem Raleigh NC 27695 USA

Organic thermoelectric materials have garnered significant interest as promising candidates for energy harvesting applications. In recent years, ethylene-glycol side-chain engineering in organic semiconductors has gradually become an efficient approach to boost the performance of organic thermoelectrics. Although this strategy is widely utilized, the impact of their volume and branching structure remains unknown. This contribution describes a trade-off phenomenon between the oligo(ethylene glycol) (OEG) side chains and thermoelectric properties based on the n-type doped low-bandgap conjugated polymers, achieved through the modification of the volume and structure of side chains. Three conjugated polymers comprising a naphthalenediimide-dialkoxybithiazole backbone and different linear length or branched OEG side chains exhibit good host/dopant miscibility after doping. We find that, in the linear OEG side-chain-based polymers, the increased volume of side chains slightly influences the planarity of backbones, thereby leading to similar and satisfactory thermoelectric performances. The high fraction of side chains does not consistently yield enhanced performance, as the branched OEG side-chain introduces steric hindrance. Consequently, the accordingly conjugated backbones become less planar and rigid, resulting in critical molecular packing changes and low charge carrier mobility and doping efficiency and thus low thermoelectric performance. Our work provides a unique insight into the fundamental understanding of the relationship between molecular packing and thermoelectric properties and guides the future rational design of efficient n-type organic semiconductors.

关键词： Carrier dynamics Conjugated polymers Doping Polymers Thin films

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Dependence of the liquid crystalline properties on the exactly controlled single-site functionalized density of mesogens focused on the alternating copolymer model

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POLYMER CHEMISTRY 2021年第45期12卷 6561-6568页

作者： zhang, Ruixue Li, xuwen Ma, Hongwei Han, Li Li, Chao zhang, Songbo Bai, Hongyuan Li, Yang Dalian Univ Technol Sch Chem Engn Dept Polymer Sci & Engn State Key Lab Fine Chem Dalian 116024 Peoples R China

Fluorinated liquid crystal polymers (FLCPs) with an AB/A(2)B-alternating sequence of fluorinated biphenyl moieties (FMs) along their backbones were constructed, where the anionic copolymerization of isoprene (Ip) with, mono-SiH and di-SiH functionalized 1,1-diphenylethylene (DPE) derivatives was performed to prepare alternating copolymer precursors with exactly controlled single-site densities of -SiH, i.e., alt-P(D-S/Ip) and alt-P(D-2S/Ip), respectively, followed by highly efficient hydrosilylation to introduce FMs into the repeating unit (DPE). Previous work indicated that the mesogenic properties were related to the distance between neighbouring mesogenic moieties in different polymerized units when the degree of polymerization (DP) of the copolymers was low. Hence, the present strategy provides a novel model to explore dependence of the mesogenic properties on the exactly controlled single-site functionalized density of mesogens (FMs) for the resulting alternating-templated FLCPs, which was achieved due to a quite low DP (11 for mono-SiH and 5 for di-SiH), while exhibiting a similar overall concentration of FMs along backbones bearing a similar number of Si-H groups. The results show that the polarized optical textures and the temperature range of mesogenic phase formation (Delta T) varied remarkably between A(2)B-alternating (Delta T = 104 degrees C) and AB-alternating (Delta T = 23 degrees C) FLCPs;in particular, the variation in phase transition temperature is possibly a result of exactly controlled single-site functionalized density. Herein, a novel morphological aggregation model is proposed to increase the comprehension of how the exactly controlled single-site functionalized density of FMs arranged within the small scale of polymer chains directs molecular packing and interactions between them, thereby enriching the diversity of molecular interactions.

关键词： Silicon compounds

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Hermetic Packaging Based on Cu-Sn and Au-Au Dual Bonding for High-Temperature Graphene Pressure Sensor

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MICROMACHINES 2022年第8期13卷 1191-1191页

作者： Wang, Junqiang zhang, Haikun Chen, xuwen Li, Mengwei North Univ China Acad Adv Interdisciplinary Res Taiyuan 030051 Peoples R China North Univ China Not Key Lab Instrumentat Sci & Dynam Measurement Taiyuan 030051 Peoples R China

A chip-level hermetic package for a high-temperature graphene pressure sensor was investigated. The silicon cap, chip and substrate were stacked by Cu-Sn and Au-Au bonding to enable wide-range measurements while guaranteeing a high hermetic package. Prior to bonding, the sample was treated with Ar (5% H-2) plasma. The Cu-Sn bonding was firstly performed at 260 degrees C for 15 min with a pressure of 9.9 MPa, and the corresponding process conditions for Au-Au bonding has increased to 300 degrees C, 20 min and 19.8 MPa respectively. The average shearing strength was 14.3 MPa, and an excellent leak rate of 1.72 x 10(-4) Pa center dot cm(3)/s was also achieved. After high-temperature storage (HTS) at 350 degrees C for 10 h, the resistance of graphene decreased slightly because the dual bonding provided oxygen-free environment for graphene. The leakage rate of the device slightly increased to 2.1 x 10(-4) Pa center dot cm(3)/s, and the average shear strength just decreased to 13.5 MPa. Finally, under the pressure range of 0-100 MPa, the graphene pressure sensor exhibited a high average sensitivity of 3.11 omega/MPa. In conclusion, the dual bonding that combined Cu-Sn and Au-Au is extremely suitable for hermetic packaging in high-temperature graphene pressure sensors.

关键词： Cu-Sn bonding Au-Au bonding graphene high-temperature pressure sensor

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