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Recyclability and Self-Healing of Dynamic Cross-Linked Polyimide with Mechanical/Electrical Damage

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Energy & Environmental Materials 2023年第1期6卷 401-407页

作者： Baoquan Wan ming-Sheng Zheng Xing Yang Xiaodi Dong Yuchao Li Yiu-Wing mai George Chen Jun-Wei Zha School of Chemistry and Biological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing 100083China Shunde Graduate School of University of Science and Technology Beijing Foshan 528300China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydney New South Wales 2006Australia Department of Electronics and Computer Science University of SouthamptonSouthampton SO171BJUK

Recyclability and self-healing are two most critical factors in developing sustainable polymers to deal with environmental pollution and resource *** this work,a dynamic cross-linked polyimide insulation film with full closed-loop recyclability is successfully prepared,which also possesses good self-healing ability after being mechanical/electrical damaged depending on the Schiff base dynamic covalent *** recycled and self-healed polyimide film still maintain its good tensile strength(r t)>60 MPa with Young’s modulus(E)>4 GPa,high thermal stability with glass transition temperature(T g)>220℃,and outstanding insulation property with breakdown strength(E 0)>358 kV mm^(-1),making it a very promising low energy consumption and high temperature resistant insulation *** strategy of using Schiff base dynamic covalent bonds for reversible repairing the structure of high T g polyimides promotes the wider application of such sustainable and recyclable material in the field of electrical power and micro-electronics.

关键词： electrical damage polyimide recyclability self-healing

Borate-Modified,Flame-Retardant Paper Packaging Materials for Archive Conservation

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Journal of Renewable Materials 2022年第4期10卷 1125-1136页

作者： Juanli Wang ming Cao Jiaxin Li Kaiyuan Li Xiaolian Chao Bingjie mai Yuhu Li Jing Cao Engineering Research Center of Historical and Cultural Heritage Protection Ministry of EducationSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an710119China Ningbo University of Finance&Economics Ningbo315175China

Paper packaging materials like cardboards are widely used to protect archives which are a major kind of cultural ***,paper is a combustible material,and thus exploring environment-friendly flame retardant for paper-based archive packaging material plays an important ***,boric acid,borax and disodium octaborate are used to modify the craft paper-based packaging materials for archive conservation to improve fire *** modified craft paper exhibits much higher flame retardancy than the pristine one dose based on vertical burning tests,without much influence on mechanical properties such as tensile strength and elongation at *** analysis(TGA),scanning electron microscope(SEM),and X-ray photoelectron spectroscopy(XPS)reveal that porous glass structure is formed during the combustion,because thermal decomposition of boric acid,borax and disodium octaborate will produce porous glassy matter as B_(2)O_(3).The porous glass covers the paper surface as an insulating layer which retards the further pyrolysis and combustion,resulting in a denser carbon *** study provides a robust way to reduce the fire hazard of the archive packaging material by applying environment-friendly boron-based fire retardants.

关键词： Paper packaging materials archive conservation flame retardant

Loss of energy dissipation capacity from the deadzone in linear and nonlinear viscous damping devices

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Earthquake Engineering and Engineering Vibration 2007年第1期6卷 11-20页

作者： mai Tong Thomas Liebner Multidisciplinary Center for Earthquake Engineering Research State University of New York at Buffalo USA Department of Mechanical Engineering Pennsylvania State University

In a viscous damping device under cyclic loading, after the piston reaches a peak stroke, the reserve movement that follows may sometimes experience a short period of delayed or significantly reduced device force output. A similar delay or reduced device force output may also occur at the damper＇s initial stroke as it moves away from its neutral position. This phenomenon is referred to as the effect of ＂deadzone＂. The deadzone can cause a loss of energy dissipation capacity and less efficient vibration control. It is prominent in small amplitude vibrations. Although there are many potential causes of deadzone such as environmental factors, construction, material aging, and manufacture quality, in this paper, its general effect in linear and nonlinear viscous damping devices is analyzed. Based on classical dynamics and damping theory, a simple model is developed to capture the effect ofdeadzone in terms of the loss of energy dissipation capacity. The model provides several methods to estimate the loss of energy dissipation within the deadzone in linear and sublinear viscous fluid dampers. An empirical equation of loss of energy dissipation capacity versus deadzone size is formulated, and the equivalent reduction of effective damping in SDOF systems has been obtained. A laboratory experimental evaluation is carried out to verify the effect of deadzone and its numerical approximation. Based on the analysis, a modification is suggested to the corresponding formulas in FEMA 3 5 6 for calculation of equivalent damping if a deadzone is to be considered.

关键词： viscous damping device stroke deadzone sublinear viscous fluid dampers

Three-Dimensional Dust-Acoustic Waves in a Collisional Dusty Plasma with Opposite Polarity Particles

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Communications in Theoretical Physics 2005年第4X期44卷 719-723页

作者： LIN mai-mai DUAN Wen-Shah Department of Physics Northwest Normal University Lanzhou 730070 China

The dispersion relation is derived for three-dimensional dust-acoustic waves in a current-driven dusty plasmas with both positively and negatively charged dust particles. The dependencies of the frequency and the growth rate on the wave number K, the intensity of magnetic field B, and the inclination angle θ have been numerically shown in this paper. The growth rate is negative for the laboratory dusty plasma, but it is positive for the cosmic dusty plasma. It is found that when the inclination angle θ = π/2, there is no instability. The effect of the electrostatic field Eo has also been studied in this paper.

关键词： dust plasma opposite polarity particles

The evolution,pathogenicity and transmissibility of quadruple reassortant H1N2 swine influenza virus in China:A potential threat to public health

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Virologica Sinica 2024年第2期39卷 205-217页

作者： Xinxin Cui Jinhuan Ma Zifeng Pang Lingzhi Chi Cuishan mai Hanlin Liu ming Liao Hailiang Sun College of Veterinary Medicine South China Agricultural UniversityGuangzhou510642China Key Laboratory of Zoonosis Control and Prevention of Guangdong Province South China Agricultural UniversityGuangzhou510642China National and Regional Joint Engineering Laboratory for Medicament of Zoonosis Prevention and Control South China Agricultural UniversityGuangzhou510642China Shandong Vocational Animal Science and Veterinary College Weifang261061China Institute of Animal Health Guangdong Academy of Agricultural SciencesGuangzhou510640China

Swine are regarded as“intermediate hosts”or“mixing vessels”of influenza viruses,capable of generating strains with pandemic *** 2020 to 2021,we conducted surveillance on swine H1N2 influenza(swH1N2)viruses in swine farms located in Guangdong,Yunnan,and Guizhou provinces in southern China,as well as Henan and Shandong provinces in northern *** systematically analyzed the evolution and pathogenicity of swH1N2 isolates,and characterized their replication and transmission *** isolated viruses are quadruple reassortant H1N2 viruses containing genes from pdm/09 H1N1(PB2,PB1,PA and NP genes),triple-reassortant swine(NS gene),Eurasian Avian-like(HA and M genes),and recent human H3N2(NA gene)*** NA,PB2,and NP of SW/188/20 and SW/198/20 show high gene similarities to A/Guangdong/Yue Fang277/2017(H3N2).The HA gene of swH1N2 exhibits a high evolutionary *** five swH1N2 isolates replicate efficiently in human,canine,and swine cells,as well as in the turbinate,trachea,and lungs of mice.A/swine/Shandong/198/2020 strain efficiently replicates in the respiratory tract of pigs and effectively transmitted among ***,these current swH1N2 viruses possess zoonotic potential,highlighting the need for strengthened surveillance of swH1N2 viruses.

关键词： Swine influenza virus(SIV) H1N2 Evolution Replication Pathogenicity Zoonotic potential

Efficacy and safety of low-dose thalidomide combined with mesalazine in the treatment of refractory ulcerative colitis in adults

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Gastroenterology Report 2022年第1期10卷 653-655页

作者： Jun-Rong Chen Lei mai Jia-Chen Sun Xiang Peng Min Zhang Min zhi Department of General Practice The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Department of Gastroenterology The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhaiGuangdongP.R.China Department of Gastrointestinal Endoscopy The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Department of Gastroenterology The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China

Introduction Inducing and maintaining clinical remission and mucosal healing is essential in the treatment of ulcerative colitis(UC),a nonspecific chronic recurrent inflammatory disorder[1].Mesalazine(5-ASA)is commonly prescribed as a first-line drug for *** the short-term efficacy of ciclosporin and infliximab,some patients may develop methylprednisolone resistance or dependence[2].

关键词： healing clinical treatment

Warthin-like papillary renal cell carcinoma: A case report

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World Journal of Clinical Cases 2023年第30期11卷 7450-7456页

作者： Xiu-Feng Li Zheng-Jiang Wang Heng-ming Zhang mai-Qing Yang Department of Pathology Weifang People's Hospital(First Affiliated Hospital of Weifang Medical University)Weifang 261041Shandong ProvinceChina

BACKGROUND Warthin-like papillary renal cell carcinoma(WPRCC)has been described as a rare pathological subtype of papillary renal cell carcinoma in the 2022 World Health Organization Classification of the Urinary and Male Reproductive *** we report a case of WPRCC in the left *** SUMMARY Physical examination of a previously healthy 47-year-old woman revealed a lump in her left kidney,4.5 cm×3.5 cm×3.5 cm in *** on the clinical information,imaging data,histmorphological features,and immunohistochemistry results,the pathological diagnosis was WPRCC in left *** Resection of the mass in the left kidney was performed and her postoperative course was uneventful.

关键词： Papillary renal cell carcinoma Warthin-like Clinicopathologic features Case report

Molecular basis of enhanced GLP-1 signaling mediated by GLP-1(9-36) in conjunction with LSN3318839

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ACTA PHARMACEUTICA SINICA B 2024年第11期14卷 5069-5073页

作者： Li, Jie Li, Guanyi mai, Yiting Liu, Xiao Yang, Dehua Zhou, Qingtong Wang, ming-Wei Fudan Univ Sch Basic Med Sci Dept Pharmacol Shanghai 200032 Peoples R China Shanghai Jiao Tong Univ Sch Pharmaceut Sci Shanghai 200240 Peoples R China Res Ctr Deepsea Bioresources Sanya 572025 Peoples R China Chinese Acad Sci Shanghai Inst Mat Med Natl Ctr Drug Screening Shanghai 201203 Peoples R China Shanghai Jiao Tong Univ Ruijin Hosp Translat Res Ctr Struct Biol Sch Med Shanghai 200025 Peoples R China Hainan Med Univ Engn Res Ctr Trop Med Innovat & Transformat Sch Pharm Minist Educ Haikou 570228 Peoples R China

To the Editor:Glucagon-like peptide-1(GLP-1)receptor(GLP-1R)is a well-established drug target for type 2 diabetes and *** is activated by the endogenous hormone GLP-1(7-36)NH_(2)[GLP-1(7-36)hereafter]to maintain glucose ***-1(7-36),produced through the proteolytic processing of proglucagon and released by L cells in the small intestine and colon,is rapidly degraded by dipeptidyl peptidase 4 with a half-life of approximately 2 *** resulting metabolite,GLP-1(9-36)NH_(2)[GLP-1(9-36)hereafter],lacks the N-terminal dipeptide His7 and Ala8(Supporting Information Fig.S1A)2 and constitutes approximately 60%of circulating *** to GLP-1(7-36),GLP-1(9-36)is a low potency and weak partial agonist of GLP-1R(Fig.1A)*** was initially believed to be biologically ***,GLP-1(9-36)has been implicated in hepatic glucose production5,glycemic control6 and glucagonostatic actions7,*** cardiovascular9,10 and neuroprotective benefits11,12 were also reported.

关键词： GLP-1(9-36) Cryo-electron microscopy Metabolite Allosteric modulation

ENHANCED MECHANICAL PROPERTIES OF POLYPROPYLENE/SILICA NANOCOMPOSITES WITH SURFACE MODIFICATION OF NANO-SILICA VIA IN SITU COPOLYMERIZATION OF METHYL METHACRYLATE AND BUTYL ACRYLATE

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Chinese Journal of Polymer Science 2009年第5期27卷 685-694页

作者： Yiu-wing mai Center for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringJ07University of Sydney

Nano-sized silica particles were modified with methacryloxy-propyltrimethoxysilane(MPS) followed by in situ copolymerization of methyl methacrylate(MMA) and butyl acrylate(BA).These modified nanoparticles were compounded with polypropylene(PP) to prepare PP/silica *** grafted on nano-silica enhances the dispersion of the nanoparticles and interfacial adhesion,decreases the size of PP spherulites in nanocomposites and leads to increasing the Young's modulus and toughness of PP/silica nanocomp...

关键词： Nano composites Interface Mechanical properties.