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Recent progress in the development of dielectric elastomer materials and their multilayer actuators

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Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2024年第3期25卷 183-205页

作者： Shengchao JIANG Junbo PENG Lvting WANG Hanzhi ma ye {2. ZJU-UIUC Institute Zhejiang UniversityJiaxing 314400China College of Mechanical Engineering Zhejiang UniversityHangzhou 310058China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310058China

Dielectric elastomers(DEs)have emerged as one of the most promising artificial muscle technologies,due to their exceptional properties such as large actuation strain,fast response,high energy density,and flexible processibility for various *** the past two decades,researchers have been working on developing DE materials with improved properties and exploring innovative applications of dielectric elastomer actuators(DEAs).This review article focuses on two main topics:recent material innovation of DEs and development of multilayer stacking processes for DEAs,which are important to promoting commercialization of *** begins by explaining the working principle of a ***,recently developed strategies for preparing new DE materials are introduced,including reducing mechanical stiffness,increasing dielectric permittivity,suppressing viscoelasticity loss,and mitigating electromechanical instability without *** the next section,different multilayer stacking methods for fabricating multilayer DEAs are discussed,including conventional dry stacking,wet stacking,a novel dry stacking method,and micro-fabrication-enabled stacking *** review provides a comprehensive and up-to-date overview of recent developments in high-performance DE materials and multilayer stacking *** highlights the progress made in the field and also discusses potential future directions for further advancements.

关键词： Dielectric elastomer actuator(DEA) Dielectric elastomer(DE) material svnthesis Multilaver stacking method

The crystal structure of (Fe_(4)Cr_(4)Ni)_(9)C_(4)

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Science china Earth Sciences 2005年第3期48卷 338-345页

作者： shi nicheng1, {2. {2.1, XIONG Ming1, DAI Mingquan1, BAI Wenji2. FANG Qingsong2. YAN Binggang2.& YANG Jingsui2.1. X-ray Diffraction Laboratory, china university of geosciences, Beijing 100083. china 2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, china 1. X-ray Diffraction Laboratory China University of Geosciences 100083 Beijing China 2. Institute of Geology Chinese Academy of Geological Sciences 100037 Beijing China

(Fe4Cr4Ni)9C4 is a metal carbide mineral formed by combination of Fe, Cr and Ni with C. It occurs in a chromite deposit in the Luobusha ophiolite, Tibet. Based on the determina- tion of its crystal structure, the empirical formula is (Fe4.12.r3.84Ni0.96)8.92.3.70 and the simplified formula is (Fe4Cr4Ni)4C9. The mineral is hexagonal with a = 1.38392.2. nm, c = 0.44690(9) nm, space group P63 m c, Z=6 and the calculated specific gravity Dx = 7.089 g/cm3. Fe, Cr and Ni occupy different crystallographic sites and their coordination numbers are approximately 12. forming an alternate stacking sequence of flat and puckered layers along the c axis. Some me- tallic atoms have a defect structure. The interatomic distances of Fe, Cr and Ni are 0.2.2.— 0.2.66 nm, and the distances between Fe, Cr, Ni and C are 0.1893—0.2.69 nm. The coordina- tion number of carbon is 6. It occurs in interstices of the metallic atoms Fe, Cr and Ni to form trigonal-prismatically coordinated polyhedra. These coordination polyhedra are linked with each other via shared corners or shared edges into a new type of metal carbide structure.

关键词： Luobusha of Tibet, metal carbide, crystal structure.

Response of phytoplankton functional group to spring drought in a large subtropical reservoir

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Journal of Oceanology and Limnology 2024年第5期42卷 1586-1596页

作者： Yue WU Qi ye Siwen CHEN Kaining CHEN Shuzhan ma Yiheng CHANG Xiaoli {2. State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China university of Chinese Academy of Sciences Beijing 100049China State Environmental Protection Key Laboratory of Aquatic Ecosystem Health in the Middle and Lower Reaches of Yangtze River Jiangsu Provincial Academy of Environmental ScienceNanjing 210036China

Global warming has caused an increase in the frequency and duration of droughts *** could trigger large changes in physico-chemical conditions and phytoplankton community in waterbodies,resulting in a shift in the phytoplankton *** diatom blooms in reservoirs have been increasingly observed in the past decade in the Taihu Lake *** aim of the present study is to elucidate the impacts of droughts on aquatic environment and to determine the driving factors for the succession of the phytoplankton functional groups based on the analysis of data collected during spring from 2.09 to 2.2. in the Daxi *** unimodal relationship between 1-month aggregated precipitation index and phytoplankton species richness indicated the competitive exclusion occurred in extremely drought *** structural equation modeling indicated that drought-related low water level conditions intensified sediment resuspension,and increased the phosphorus-enriched nonalgal turbidity in the Daxi ***,a steady shift in the Reynolds phytoplankton functional groups from L 0,TD,J,X 2.and A(phytoplankton taxa preferring low turbidity and nutrient conditions)to TB(pennate diatoms being adapt to turbid and nutrient-rich conditions)was *** increased TP and non-algal turbidity in addition to the lowered disturbance contribute to the prevalence of Group *** the difficulties in nutrient control,timely water replenishment is often a feasible method of controlling the dominance of harmful algae for reservoir ***,alternative water sources are in high demand for ensuring ecological safety and water availability when dealing with drought.

关键词： drought reservoir sediments resuspension phytoplankton functional group diatom

A New Three-Dimensional Superstructure in Bafertisite

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Acta Geologica Sinica(English Edition) 2011年第5期85卷 1028-1035页

作者： LI Guowu~*,XIONG Ming,shi nicheng and {2. zhesheng Crystal structure laboratory,National Laboratory of Mineral {2.terials,china university of geosciences (Beijing),Beijing 100083.china Crystal structure laboratory National Laboratory of Mineral Materials China University of Geosciences (Beijing) Beijing 100083 China *Correspondence: Guowu LI *Correspondence: Corresponding author. E-mail: liguowu@***

A new superstructure was found in bafertisite[(Ba;Na;);(Fe;Mn;Mg;);TiO [(Si;Ti;Al;Cr;);O;](OH;F;Cl;);]from Donghai County,Jiangsu Province,*** occurrence of the superstructure reflections were observed by single crystal diffraction using a SmaR APEX *** a;,b;and c;axis directions revealed extra weak reflection spots of the *** apparent 2.,2. and 2. superstructure is monoclinic with unit cell a=10.6502.1.） A,b= 13.72.3（19）A,c=2..6897（3）A,α=90°,β=94.698（3）°,γ=90°,space group Cm,Z=*** c;extra weak reflections are ignored,the secondary supercell gave a cell a=10.6548（15）A,b=13.72.4（19）A,c = 11.6900（17）A,α=90°,β=112.32.（2.）°,γ=90°,space group Cm,Z=*** basic subcell was obtained by ignoring all extra weak reflection spots and gave:a=5.32.9（17）A,b=6.8669（2.）A,c=10.8709（36） A,α=90°,β=94.740（62.°,γ=90°,space P2./m,Z=*** superstructure has been refined to R = 0.063 for 7805[R;= 0.02.6]unique reflections I>2.（I）.The structure consists of an octahedra（O） sheet sandwiched between two heteropolyhedral（H） *** sheets consist of Ti-octahedra and twin tetrahedral disilicate groups[Si;O;].The O sheet comprises（Fe,Mg）O;*** large Ba cation is located in the interla{2.r *** refined structure shows Fe,Mg are partly *** shifting of the TiO;octahedron and SiO;tetrahedron sites in the sheet may be a consequence of the superstructure.

关键词： bafertisite superstructure crystal structure layered titanium silicate

Homozygous CCDC146 mutation causes oligoasthenoteratozoospermia in humans and mice

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Zoological Research 2024年第5期45卷 1073-1087页

作者： Jing-Wei ye Tanveer Abbas Jian-Teng Zhou Jing Chen Meng-Lei Yang Xiong-Heng Huang Huan Zhang Hui ma Ao ma Bo Xu Ghulam Murtaza Qing-Hua shi Bao-Lu shi Division of Reproduction and Genetics First Affiliated Hospital of University of Science and Technology of ChinaHefei National Laboratory for Physical Sciences at MicroscaleSchool of Basic Medical SciencesDivision of Life Sciences and MedicineBiomedical Sciences and Health Laboratory of Anhui ProvinceInstitute of Health and MedicineHefei Comprehensive National Science CenterUniversity of Science and Technology of ChinaHefeiAnhui 230026China Institute of Andrology Nanjing Drum Tower HospitalAffiliated Hospital of Nanjing University Medical SchoolNanjingJiangsu 210008China

Infertility represents a significant health concern,with sperm quantity and quality being crucial determinants of male ***(OAT)is characterized by reduced sperm motility,lower sperm concentration,and morphological abnormalities in sperm heads and *** variants in several genes have been implicated in OAT,its genetic etiologies and pathogenetic mechanisms remain inadequately *** this study,we identified a homozygous nonsense mutation(c.916C>T,***306*)in the coiled-coil domain containing 146(CCDC146)gene in an infertile male patient with *** mutation resulted in the production of a truncated CCDC146 protein(amino acids 1-305),retaining only two out of five coiled-coil *** validate the pathogenicity of the CCDC146 mutation,we generated a mouse model(Ccdc146^(mut/mut))with a similar mutation to that of the ***,the Ccdc146mut/mut mice exhibited infertility,characterized by significantly reduced sperm counts,diminished motility,and multiple defects in sperm heads and ***,the levels of axonemal proteins,including DNAH17,DNAH1,and SPAG6,were significantly reduced in the sperm of Ccdc146^(mut/mut) ***,both human and mouse CCDC146 interacted with intraflagellar transport protein 2.(IFT2.),but this interaction was lost in the mutated versions,leading to the degradation of *** study identified a novel deleterious homozygous nonsense mutation in CCDC146 that causes male infertility,potentially by disrupting axonemal protein *** findings offer valuable insights for genetic counseling and understanding the mechanisms underlying CCDC146 mutant-associated infertility in human males.

关键词： Oligoasthenoteratozoospermia Human infertility Sperm flagellum CCDC146 Intraflagellar transport IFT2.

Targeting CXCR4 and EDN1 for the treatment of recurrent miscarriage using stearic acid from traditional Chinese medicine

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Traditional Medicine Research 2024年第11期9卷 65-75页

作者： Fang Liu Dong-Mei shi Wen-ye {2. Da-Wei Tang Gang Bai Xin-You Yu Reproductive Center of Yinchuan maternal and Child Health Hospital Yinchuan 750001China Prenatal Diagnosis Center of Ningxia Medical university General Hospital Yinchuan 750004China

Background:Recurrent miscarriage(RM)affects an estimated 1-3%of couples attempting to conceive,and its molecular components stay ineffectively caught *** study aims to explore potential therapeutic targets for RM by examining gene expression patterns and biological pathways in both mouse and human RM ***,explore relevant traditional Chinese medicine(TCM)components targeting potential therapeutic ***:We utilized the GSE{2.51 mouse and the GSE2.787 human datasets,employing gene set enrichment analysis and gene metaphysics analysis to examine differentially expressed genes and enriched ***-cell RNA analysis uncovered cellular heterogeneity and arranged pharmacology-mapped potential drug-target *** employed molecular docking strategies to assess the affinity of TCM components for key ***:In the mouse model,genes such as Ly6f1 and Gpr2. were upregulated,while Stc5a and Galca exhibited *** set enrichment analysis identified key pathways,including the tumor necrosis factor-mediated signaling *** human samples,Gene Ontology analysis highlighted processes such as apoptosis and cell ***-cell RNA analysis revealed distinct cellular populations between normal and RM *** pharmacology identified C-X-C motif chemokine receptor 4(CXCR4)and endothelin 1(EDN1)as potential key targets,and molecular docking confirmed that stearic acid from TCM appears to regulate these ***:This study presents a comprehensive analysis of the genetic and cellular underpinnings of RM,identifying CXCR4 and EDN1 as promising therapeutic *** acid from TCM could provide targeted treatment by modulating these key proteins,paving the way for new RM treatment strategies.

关键词： RM gene expression single-cell RNA analysis CXCR4 EDN1 stearic acid

Crystal Structure of Natural Non-metamict Ti- and Fe2.-rich Chevkinite-（Ce）

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Acta Geologica Sinica(English Edition) 2005年第3期 325-331页

作者： LI Guowu1,YANG Guangming2.ma Zhengsheng1,shi {2.1,XIONG Ming1,FAN Haifu3 and SHENG Ganfu4 1 china university of geosciences(Beijing),Beijing 100083.2.china university of geosciences(Wuhan),Wuhan,Hubei 430074 3 Institute of Physics,Chinese Academy of Sciences,Beijing 100080 4 Chengdu Institute of Geology and Mineral Resources,Chengdu,Sichuan 610082

The crystal structure of non-metamict Ti- and Fe2.-rich chevkinite-(Ce) has been redetermined with the single -crystal sample collected from Bayan Obo, Inner Mongolia, china. The chemical formula of the sample is Ce4Fe2.i3Si4O2.. The crystals are monoclinic with the unit cell parameters a = 13.4656(15) ?, b = 5.7356(6) ?, c = 11.0977(12. ?, β= 100.636(2.o, V = 842.39 (16) ?3 and Z = 2. The structures of Ti- and Fe2.-rich chevkinite-(Ce) were refined with space groups P2./a and C2.m. Least-squares refinement results show that both structural models of Ti- and Fe2.-rich chevkinite-(Ce) are very good, R[F2.2.(F2.] =0.02. with P2./a and R[F2.2.(F2.] =0.02. with C2.m. In order to illustrate the relationship between the two space groups P2./a and C2.m, the distribution of diffraction intensities was inspected. Pseudo extinction was found, i.e., reflections with h+k=2. are syste{2.tically strong, while those with h+k=2.+1 are weak. By neglecting the syste{2.tically weak (h+k=2.+1) reflections the space group becomes C2.m. There is a mirror plane in the C2.m perpendicular to the b axis. However, oxygen atoms in the P2./a model are of a symmetrical relationship with the corresponding pseudo mirror plane. It is concluded that the crystal structure of non-metamict Ti- and Fe2.-rich chevkinite-(Ce) is a superstructure with the space group of P2./a, which is of pseudo symmetry corresponding to the space group C2.m.

关键词： non-metamict Ti- and Fe2.-rich chevkinite-(Ce) crystal structure space group superstructure

Oxygen‑Coordinated Single Mn Sites for Efficient Electrocatalytic Nitrate Reduction to Ammonia

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Nano-Micro Letters 2024年第1期16卷 147-159页

作者： Shengbo Zhang Yuankang Zha Yixing ye Ke Li Yue Lin Lirong Zheng Guozhong Wang Yunxia Zhang Huajie Yin Tongfei shi Haimin Zhang Laboratory of materials Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031People’s Republic of China university of Science and Technology of china Hefei 230026People’s Republic of China Key Laboratory of Agricultural Sensors Ministry of AgricultureSchool of Information and ComputerAnhui Agricultural UniversityHefei 230026People’s Republic of China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026People’s Republic of China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of Sciences19B Yuquan RoadBeijing 100049People’s Republic of China

Electrocatalytic nitrate reduction reaction has attracted increasing attention due to its goal of low carbon emission and environmental ***,we report an efficient NitRR catalyst composed of single Mn sites with atomically dispersed oxygen(O)coordination on bacterial cellulose-converted graphitic carbon(Mn-O-C).Evidence of the atomically dispersed Mn-(O-C_(2.)_(4)moieties embedding in the exposed basal plane of carbon surface is confirmed by X-ray absorption *** a result,the as-synthesized Mn-O-C catalyst exhibits superior NitRR activity with an NH_(3)yield rate(RNH_(3))of 1476.9±62.6μg h^(−1)cm^(−2.at−0.7 V(*** hydrogen electrode,RHE)and a faradaic efficiency(FE)of 89.0±3.8%at−0.5 V(***)under ambient ***,when evaluated with a practical flow cell,Mn-O-C shows a high RNH_(3)of 3706.7±552.0μg h^(−1)cm^(−2.at a current density of 100 ma cm−2.2.5 times of that in the H *** in situ FT-IR and Raman spectroscopic studies combined with theoretical calculations indicate that the Mn-(O-C_(2.)_(4)sites not only effectively inhibit the competitive hydrogen evolution reaction,but also greatly promote the adsorption and activation of nitrate(NO_(3)^(−)),thus boosting both the FE and selectivity of NH_(3)over Mn-(O-C_(2.)_(4)sites.

关键词： Atomically dispersed Oxygen coordination Nitrate reduction reaction In situ spectroscopic studies Hydrogen evolution reaction

Efficacy and safety of transvaginal mesh repair in a cohort with a minimum of 10-year follow-up

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Science china(Life Sciences) 2024年第5期67卷 1061-1068页

作者： Zhibo Zhang Jianbin Guo Weijie Tian ye Zhang Yuelun Zhang Tianshu Sun Jiali Duan Xinmiao Bao Yuan Wang Yang ye Qianqian Gao Honghui {2. Abraham Nick Morse Juan Chen Lan Zhu Departmentof Obstetrics and Gynecology Peking Union MedicalCollege HospitalChinese Academyof Medical Sciences&Peking Union MedicalCollegeNational Clinical Research Center for Obstetricand Gynecologic DiseasesBeijing 100730China Department of Gynecology Guizhou Provincial People’s HospitalMedical College of Guizhou UniversityGuiyang 550002China Department of Obstetrics and Gynecology The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450000China Medical Research Center Peking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Medical Doctor Program Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Pathology Peking Union Medical College HospitalBeijing 100730China Tufts university School of Medicine Boston MA 02111USA

Although transvaginal mesh(TVM)repair is no longer used in some countries,long-term outcomes after TVM surgery are of great importance ***,reports with follow-up>10 years are ***,this study aimed to report outcomes in a prospective cohort with at least 10 years of *** with stageⅢ–Ⅳsympto{2.tic prolapse were approached consecutively from 2.08 to 2.1. at one tertiary *** {2.in outcome measure was sympto{2.tic *** outcomes included anatomic failure,recurrence,patient satisfaction,complications,and *** Kaplan-Meier curve was used to esti{2.te the cumulative failure *** the 12. patients enrolled in the study,103(85.1%)completed a median follow-up of 11 *** esti{2.ted probability rates of sympto{2.tic and anatomic failure were 17.6%and 8.8%in 11 years,*** esti{2.ted incidence of sympto{2.tic failure increased by 8.2.between 5 and 11 years;however,the corresponding rate for anatomic failure was 3.7%.The most common complication was vaginal mesh exposure,and its esti{2.ted probability increased from 19.3%to 2..4%from 5 to 11 years,*** trimming resolved 80.0%of vaginal *** patients did not report decreased overall *** with vaginal mesh exposure requiring>3 office procedures or mesh removal in the operating room(5.8%by 11 years)had lower satisfaction rates(P1)and were defined as having severe mesh *** rates of postoperative pain,reoperation,and Patient Global Impression of Improvement≥2.were 2.5%,3.3%,and 94.2.,*** results of this study implied that TVM treatment gradually increased the sympto{2.tic failure rate but provided durable anatomical support of the vaginal *** mesh exposure was common in women who were largely not sexually active;however,80%of the cases could be {2.naged in the outpatient clinic,which did not affect patient satisfaction.

关键词： complication efficacy long-term follow-up pelvic organ prolapse safety transvaginal mesh