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Biodegradable Poly(butylene adipate-co-terephthalate)/Poly(glycolic acid) Films: Effect of Poly(glycolic acid) Crystal on Mechanical and Barrier Properties

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Chinese Journal of Polymer Science 2023年第7期41卷 1123-1132页

作者： Hong-Wei Pan Ye Wang Shi-Ling Jia Yan Zhao Jun-Jia Bian hui-Li Yang Yan-Ping Hao Li-Jing Han hui-liang Zhang Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun130022China School of Pharmaceutical Sciences Changchun University of Chinese MedicineChangchun130117China Changchun University of Technology Changchun130012China Shandong Dawn Polymer Co. Ltd.Longkou265700China

Binary biodegradable polymers films, poly(butylene adipate-co-terephthalate)(PBAT) and poly(glycolic acid)(PGA), were prepared through batch melt mixing to obtain Film Ⅰ and Film Ⅱ under two different processing conditions. PGA crystals played a major role in enhancing the mechanical and barrier properties of the films. For Film Ⅰ, there were initial PGA crystals before the film blowing process, the PGA molecular chain further crystallized, forming the oriented crystallization of PGA. Moreover, the Xcand crystalline size in Film Ⅰ were higher than those in Film Ⅱ. Compared with the different processing methods, Film Ⅰ has excellent mechanical and oxygen barrier properties due to the crystallization and orientation. The tensile strength reached 45.0 MPa, and tear strength exceeded 138.2 kN/m, while the elongation at break was as high as 750% for PBAT/PGA 85/15 in Film Ⅰ. The WVTR, WVP coefficients, and OP coefficients of PBAT/PGA films were decreased obviously with increasing the PGA content both in Film Ⅰ and Film Ⅱ. Moreover, the barrier properties of oxygen in Film Ⅰ were better than that in Film Ⅱ. This work reveals a feasible processing technique by introducing of initial crystallization of PGA to blow PBAT/PGA films with excellent mechanical and barrier properties.

关键词： Poly(butylene adipate-co-terephthalate) Poly(glycolic acid)(PGA) Biodegradable polymers Films

Design,Optimization and Numerical Modelling of A Novel Floating Pendulum Wave Energy Converter with Tide Adaptation

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China Ocean Engineering 2017年第5期31卷 578-588页

作者： YANG Jing ZHANG Da-hai CHEN Ying liang hui TAN Ming LI Wei MA Xian-dong Ocean College Zhejiang University The State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Engineering Department Lancaster University

A novel floating pendulum wave energy converter （WEC） with the ability of tide adaptation is designed and presented in this paper. Aiming to a high efficiency, the buoy＇s hydrodynamic shape is optimized by enumeration and comparison. Furthermore, in order to keep the buoy＇s well-designed leading edge always facing the incoming wave straightly, a novel transmission mechanism is then adopted, which is called the tidal adaptation mechanism in this paper. Time domain numerical models of a floating pendulum WEC with or without tide adaptation mechanism are built to compare their performance on various water levels. When comparing these two WECs in terms of their average output based on the linear passive control strategy, the output power of WEC with the tide adaptation mechanism is much steadier with the change of the water level and always larger than that without the tide adaptation mechanism.

关键词： wave energy simulation model analysis tide adaptation

Microstructure and wear resistance of AlCrFeNiMo_(0.5)Si_(x) high-entropy alloy coatings prepared by laser cladding

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China Foundry 2022年第6期19卷 473-480页

作者： Xiao-cong Li hui liang Yan-zhou Zhao Li Gao Li Jiang Zhi-qiang Cao Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina

In recent years,the coating prepared by laser cladding has attracted much attention in the field of wear *** this work,AlCrFeNiMo_(0.5)Si_(x)(x=0,0.5,1.0,1.5,2.0)high-entropy alloy coatings were designed and prepared on Q235 steel by laser *** effect of Si content on microstructure,microhardness and wear resistance of the coatings was studied in *** results indicate that the AlCrFeNiMo_(0.5)Si_(x) highentropy alloy coatings show an excellent bonding between substrate and the cladding *** AlCrFeNiMo_(0.5)Si_(x) coatings are composed of nano-precipitated phase with BCC structure and matrix with ordered B2 *** the addition of Si,the white phase(Cr,Mo)_(3)Si with cubic structure appears in the interdendritic,and the morphology of the coating(x=2.0)transforms into lamellar eutectic-like *** addition of Si enhances the microhardness and significantly improves the wear resistance of the *** x increases from 0 to 2.0,the average hardness of the cladding zone increases from 632 HV to 835 HV,and the wear rate decreases from 1.64×10^(-5) mm^(3)·(N·m)^(-1) to 5.13×10^(-6) mm^(3)·(N·m)^(-1).When x≥1.5,the decreasing trend of the wear rate gradually slows *** wear rates of Si1.5 and Si2.0 coatings are 5.85×10^(-6) mm^(3)·(N·m)^(-1) and 5.13×10^(-6) mm^(3)·(N·m)^(-1),respectively,which is an order of magnitude lower than that of Q235 steel.

关键词： high-entropy alloy coatings laser cladding microstructure wear resistance

Microstructure and superconducting properties of (BaTiO3,Y2O3)-doped YBCO films under different firing temperatures

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Rare Metals 2017年第1期36卷 37-41页

作者： Hong-Yan Wang Fa-Zhu Ding Hong-Wei Gu hui-liang Zhang Ze-Bin Dong University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190 China

YBaCuO(YBCO) films with co-doping of Ba Ti O(BTO) and YOnanostructures were successfully fabricated on La Al O(LAO) substrate by metal organic deposition using trifluoroacetates(TFA-MOD). The focus of this study was to optimize the process conditions during the firing heat treatment of high critical current density(J C)-co-doped YBCO films. The effect of the firing temperatures on both the surface morphology and the superconducting properties for the doped YBCO films was systematically studied. According to the X-ray diffraction(XRD) and scanning electron microscopy(SEM) results,the films prepared at 820 and 850 °C show poor electrical performance due to impurity phases and large pores. In contrast, the dense YBCO films prepared at 830 and840 °C with the critical current densities of 10 MA-cm(77 K, 0 T) are obtained.

关键词： YBa2Cu3O7-x BaTiO3 and Y2O3 nanostructures Firing temperature TFA-MOD

Metaverse virtual social center for elderly communication in time of social distancing

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Virtual Reality & Intelligent Hardware 2023年第1期5卷 68-80页

作者： hui liang Jiupeng LI Yi WANG Junjun PAN Yazhou ZHANG Xiaohang DONG Department of Software Engineering Zhengzhou University of Light IndustryZhengzhou 450002China General Hospital of Pingmei Shenma Group Pingdingshan 467000China Department of Computer Science and Technology Beihang UniversityBeijing 100191China

Background The lack of social activities among the elderly due to physical limitations can result in loneliness and depression. The spread of COVID-19 has made it difficult for the elderly to conduct stable social activities, increasing feelings of loneliness. The metaverse is a virtual world that mirrors reality. This allows the elderly to overcome the constraints of reality and perform social activities stably and continuously, providing new ideas for alleviating loneliness. Methods By analyzing their needs, a virtual social center framework for the elderly was proposed in this study. In addition, a prototype system was designed according to this framework. The elderly can socialize in virtual reality with metaverse-related technologies and human–computer interaction tools. Additionally, a test was conducted jointly with the chief physician of the geriatric rehabilitation department of a tertiary hospital. Results The results demonstrated that the mental state of the elderly who had used the virtual social center was significantly better than that of those who had not used it. Conclusions Thus, virtual social centers can help relieve loneliness and depression among the elderly with increasing global epidemics and an aging society. Hence,they have promotional value.

关键词： Elderly Loneliness and depression Metaverse Virtual social center HCI

The effect of five-knee-point acupuncture combined with herbal package warm compress for knee osteoarthritis

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World Journal of Acupuncture-Moxibustion 2019年第2期29卷 83-90页

作者： hui liang Zhuo-rong LI Junwei CHEN hui-wen LUO Rehabilitation Medicine Department Jiangmen Second People's Hospital Jiangmen 529000 Guangdong Province China Rehabilitation Department Jiangmen Wuyi Hospital of Traditional Chinese Medicine Jiangmen Traditional Chinese Medicine Hospital Affiliated to Jinan University Jiangmen 529000 Guangdong Province China Graduate School of Hunan University of Traditional Chinese Medicine Changsha 410000 Hunan Province China

Objective:To observe the therapeutic effect differences among five-knee-point acupuncture combined with Chinese medication package warm compress therapy of Shēntòng Zhúyū Decoction(身痛逐瘀汤 generalized pain stasis-expelling decoction),simple five-knee-point acupuncture and simple Chinese medication package warm compress therapy of Shēntòng Zhúyū Decoction in treating knee osteoarthritis(KOA).Methods:A total of 126 KOA patients were randomized into a five-knee-point acupuncture combined with Chinese medication package warm compress therapy group(combined treatment group),where there were 42 cases,including 28 cases of unilateral KOA and 14 cases of bilateral KOA,totally 56 affected knees involved,a Chinese medication package warm compress therapy group(medication package group,42 cases,including 22 cases of unilateral KOA,20 cases of bilateral KOA,totally 62 affected knees involved)and a five-knee-point acupuncture group(five-knee-point group,42 cases,including 27 cases of unilateral KOA,15 cases of bilateral KOA,totally 57 affected knees involved).The basic health education was provided in all of the ***,in the combined treatment group,acupuncture was applied to the five knee points on the affected side for 30 *** warm compress with herbal package of Shēntòng Zhúyū Decoction was given for 10 to 15 *** the medication package group,the warm compress with Shēntòng Zhúyū Decoction was exerted on the affected area for 10 to 15 *** the fiveknee-point group,acupuncture was applied to SP 10,ST 34,EX-LE 2,EX-LE 4 and ST 35 and the needles were retained for 30 *** treatment in each group was given once a day,consecutively for 2 *** and after treatment,the visual analogue scale(VAS)and Lysholm knee scale were adopted to evaluate the pain degree and knee joint motor function in KOA *** clinical therapeutic effects were evaluated ***:A total of 121 cases accomplished the final observation and 5 cases were dropped out in the th

关键词： Five-knee-point acupuncture Shēntòng Zhúyū Decoction Chinese medication package warm compress therapy Knee osteoarthritis Bone bi

Synthesis and Characterization of a New Triple-layered PerovskiteKSr_2Nb_3O_(10 )and Its Protonated Compounds

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Journal of Wuhan University of Technology(Materials Science) 2002年第2期17卷 22-25页

作者：方亮 State Key Lab. of Advanced Tech. For Mater Synthesis and Processing Wuhan University of Technology Wuhan China

New layered perovskites, KSr2Nb3O10 and two new protonated niobates HSr2 Nb3O10·1.2H2O and HSr2Nb3O10,were synthesized by solid state reaction and ion-exchange reaction. These new compounds -were characterized by EPMA, AAS, XRD, IR, DTA and so on. The structure may be described as treble perovskite sheets [Sr2Nb3O10]- interleaved with K+ ,H3O + or H+. These new compounds are new members of the Dion-Jacob-sonseries with n=3 for the general formula M[An-1 NbnO3n+1], and their indexed X-ray powder diffraction data were first reported in the paper.

关键词： niobate peravskite structure ion exchange protonated

Biodegradable Foaming Material of Poly(butylene adipate-co-terephthalate)(PBAT)/Poly(propylene carbonate)(PPC)

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Chinese Journal of Polymer Science 2022年第2期40卷 208-219页

作者： Han-Lin Tian Ze-Peng Wang Shi-Ling Jia Hong-Wei Pan Li-Jing Han Jun-Jia Bian Ying Li hui-Li Yang hui-liang Zhang Changchun University of Technology School of Chemical EngineeringChangchun 130012China Key Laboratory of Polymer Ecomaterials Chinese Academy of SciencesChangchun Institute of Applied ChemistryChangchun 130022China Jilin COFCO Biochemistry Packaging Co. Ltd.Liaoyuan 136300China

A biodegradable blend foaming material of poly(butylene adipate-co-terephthalate)(PBAT)/poly(propylene carbonate)(PPC)was successfully prepared by chemical foaming agent and screw extrusion ***,PBAT was modified by bis(tert-butyl dioxy isopropyl)benzene(BIBP)for chain extension,and then the extended PBAT(E-PBAT)was foamed with PPC using a twin(single)screw *** analyzing the properties of the blends,we found that Young’s modulus increased from 58.8 MPa of E-PBAT to 244.7 MPa of E-PBAT/PPC 50/*** viscosity of the polymer has a critical influence on the formation of *** with neat PBAT(N-PBAT),the viscosity of E-PBAT increased by 3396 Pa·s and E-PBAT/PPC 50/50 increased by 8836 Pa·***,the dynamic mechanical analysis(DMA)results showed that the storage modulus(E’)at room temperature increased from 538 MPa to 1650 *** various phase morphologies(“sea-island”,“quasi-co-continuous”and“cocontinuous”)and crystallinity of the blends affected the spread velocity of gas and further affected the foaming morphology in E-PBAT/PPC ***,through the analysis of phase morphology and foaming mechanism,we concluded that the E-PBAT/PPC 70/30 component has both excellent strength and the best foaming performance.

关键词： Poly(butylene adipate-co-terephthalate) Poly(propylene carbonate) Phase structure Biodegradable foam Extrusion foaming

Random-injection-based two-channel chaos with enhanced bandwidth and suppressed time-delay signature by mutually coupled lasers: Proposal and numerical analysis

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Chinese Physics B 2021年第1期30卷 239-247页

作者： Shi-Rong Xu Xin-Hong Jia hui-liang Ma Jia-Bing Lin Wen-Yan liang Yu-Lian Yang College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China

Simultaneous bandwidth(BW) enhancement and time-delay signature(TDS) suppression of chaotic lasing over a wide range of parameters by mutually coupled semiconductor lasers(MCSLs) with random optical injection are proposed and numerically investigated. The influences of system parameters on TDS suppression(characterized by autocorrelation function(ACF) and permutation entropy(PE) around characteristic time) and chaos BW are investigated. The results show that, with the increasing bias current, the ranges of parameters(detuning and injection strength) for the larger BW(> 20 GHz) are broadened considerably, while the parameter range for optimized TDS( 20 GHz)and perfect TDS suppression. In addition, the system can generate two-channel high-speed truly physical random number sequences at 200 Gbits/s for each channel.

关键词： random distributed feedback-based optical injection two-channel chaos lasing bandwidth enhancement and time-delay signature suppression physical random number generation