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Ageing mechanisms and reliability of graphene-based electrodes

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Nano Research 2014年第12期7卷 1820-1831页

作者： Yuanyuan Shi Yanfeng Ji Fei Hui Hai-hua wu Mario Lanza Institute of Functional Nano & Soft Materials Soochow University 199 Ren-Ai Road Suzhou Industrial Park Suzhou Jiangsu 215123China

The development of flexible transparent electrodes for next generation devices has been appointed as the major topic in carbon electronics research for the next five years. Among all candidate materials tested to date, graphene and graphene based nanocomposites have shown the highest performance. Although some incipient anti-oxidation tests have been reported, in-deep ageing studies to assess the reliability of carbon-based electrodes have never been performed before. In this work, we present a disruptive methodology to assess the ageing mechanisms of graphene electrodes, which is also extensible to other carbon- based and two-dimensional materials. After performing accelerated oxidative tests, we exhaustively analyze the yield of the electrodes combining nanoscale and device level experiments with Weibull probabilistic analyses and tunneling current simulation, based on the Fowler-Nordheim/Direct-Tunneling models. Our experiments and calculations reveal that an ultra-thin oxide layer can be formed on the pristine surface of graphene. We quantitatively analyze the consequences of this layer on the properties of the electrodes, and observed a change in the conduction mode at the interface （from Ohmic to Schottky）, an effect that should be considered in the design of future graphene-based devices. Future mass production of carbon-based devices should include similar reliability studies, and the methodologies presented here （including the accelerated tests, characterization and modeling） may help other scientists to move from lab prototypes towards industrial device production.

关键词： electrode local oxidation conductive atomic force microscopy (CAFM) tunneling

A rare case of pregnancy complicated by mesenteric mass:What does chylous ascites tell us?

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World Journal of Gastroenterology 2007年第10期13卷 1632-1635页

作者： Long Sun hua wu Yan-Zhen Zhuang Yong-Song Guan Department of Minnan PET Center the First Hospital of Xiamen Fujian Medical University Xiamen 316003 Fujian Province China Department of Pathology the First Hospital of Xiamen Fujian Medical University Xiamen 316003 Fujian Province China Department of Radiology and Oncology West China Hospital of Sichuan University Chengdu 610041 Sichuan Province China

Mesenteric fibromatosis is a rare benign nonmetastatic neoplasm that appears as a sporadic lesion or occurs in patients with familial polyposis, while chylous ascites associated with aggressive mesenteric fibromatosis during pregnancy has never been reported thus far. Here we present the case of a 28-year old pregnant woman, in whom an aggressive mesenteric fibromatosis with chylous ascites was detected, involving the jejunum, superior rnesenteric artery （SMA） and superior rnesenteric vein （SMV） and pancreas. One year after a successful surgical excision, the patient had no signs of recurrence. The authors report the case for its rarity and emphasize on combining clinicopathological, radiological and immunohistochemistry analysis for management of the disease.

关键词： Mesenteric fibromatosis Pregnancy Chylous ascites

Pro-apoptotic effects of tectorigenin on human hepatocellular carcinoma HepG2 cells

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World Journal of Gastroenterology 2012年第15期18卷 1753-1764页

作者： Chun-Ping Jiang Hui Ding Da-hua Shi Yu-Rong Wang Er-Guang Li Jun-hua wu The First Clinical Medical College NanjingUniversity of Chinese Medicine Nanjing 210046 Jiangsu Province China Department of Hepatobiliary Surgery The Affiliated Drum Tower Hospital Medical School Nanjing University Nanjing 210008 Jiangsu Province China Jiangsu Key Laboratory of Molecular Medicine State Key Laboratory of Pharmaceutical Biotechnology Medical School Nanjing University Nanjing 210093 Jiangsu Province China

AIM:To investigate the effects of tectorigenin on human hepatocellular carcinoma(HCC)HepG2 ***:Tectorigenin,one of the main components of rhizome of Iris tectorum,was prepared by simple methods,such as extraction,filtration,concentration,precipitation and ***2 cells were incubated with tectorigenin at different concentrations,and their viability was assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide *** was detected by morphological observation of nuclear change,agarose gel electrophoresis of DNA ladder,and flow cytometry with Hoechst 33342,Annexin V-EGFP and propidium iodide *** of reactive oxygen species was quantified using *** Ca2+was monitored by Fura *** membrane potential was monitored using Rhodamine *** of cytochrome c from mitochondria to cytosol was detected by Western *** of caspase-3,-8 and-9 were investigated by Caspase Activity Assay ***:The viability of HepG2 cells treated by tectorigenin decreased in a concentration-and timedependent *** concentration that reduced the number of viable HepG2 cells by 50%(IC50)after 12,24 and 48 h of incubation was 35.72 mg/L,21.19 mg/L and 11.06 mg/L,***,treatment with tectorigenin at 20 mg/L resulted in a very slight cytotoxicity to L02 cells after incubation for 12,24 or 48 *** at a concentration of 20 mg/L greatly inhibited the viability of HepG2 cells and induced the condensation of chromatin and fragmentation of *** induced apoptosis of HepG2 cells in a time-and dose-dependent *** with the viability rate,induction of apoptosis was the main mechanism of the anti-proliferation effect of tectorigenin in HepG2 ***,tectorigenininduced apoptosis of HepG2 cells was associated with the generation of reactive oxygen species,increased intracellular[Ca2+]i,loss of mitochondrial membrane potential,transloca

关键词： Tectorigenin Iris tectorum maxim Apop-tosis Hepatocellular carcinoma HepG2 Mitochondria Liver cancer

The RNA-binding domain of DCL3 is required for long-distance RNAi signaling

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aBIOTECH 2024年第1期5卷 17-28页

作者： Jie Li Bo-Sen Zhang hua-Wei wu Cheng-Lan Liu Hui-Shan Guo Jian-hua Zhao State Key Laboratory of Plant Genomics Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Biotic Interactions University of the Chinese Academy of SciencesBeijing 100049China Qilu Zhongke Academy of Modern Microbiology Technology Jinan 250022China

Small RNA(sRNA)-mediated RNA silencing(also known as RNA interference,or RNAi)is a conserved mechanism in eukaryotes that includes RNA degradation,DNA methylation,heterochromatin formation and protein translation *** plants,sRNAs can move either cell-to-cell or systemically,thereby acting as mobile silencing signals to trigger noncell autonomous ***,whether and what proteins are also involved in noncell autonomous silencing have not been *** this study,we utilized a previously reported inducible RNAi plant,PDSi,which can induce systemic silencing of the endogenous PDS gene,and we demonstrated that DCL3 is involved in systemic PDS silencing through its RNA binding *** confirmed that the C-terminus of DCL3,including the predicted RNA-binding domain,is capable of binding short *** affecting RNA binding,but not processing activity,reduced systemic PDS silencing,indicating that DCL3 binding to RNAs is required for the induction of systemic *** mosaic virus infection assays showed that the RNA-binding activity of DCL3 is required for antiviral RNAi in systemically noninoculated *** findings demonstrate that DCL3 acts as a signaling agent involved in noncell autonomous silencing and an antiviral effect in addition to its previously known function in the generation of 24-nucleotide sRNAs.

关键词： RNAi signaling DCL3 RBD RNAs Cucumber mosaic virus

Changes of feeding patterns in Chinese city children under 2 years from 1985 to 2015: results from a series of national cross-sectional surveys

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World Journal of Pediatrics 2019年第2期15卷 176-181页

作者： hua-Hong wu Ya-Qin Zhang Xin-Nan Zong Hui Li Department of Growth and Development Capital Institute of PediatricsYaBao RoadChaoYang DistrictBeijing 100020China

Background In China,as the social transformation and economic development from 1985 to 2015,children's feeding pattern has undergone some *** we aimed to analyze the secular trend on feeding patterns of city children in *** All data were from a series of national survey which implemented once every 10 years in China from 1985 to *** use same indexes to evaluate the feeding pattern of children in these four *** From 1985 to 2005,the exclusive breastfeeding rates in infants under 6 months of age decreased,especially in suburban areas decreased by 17.7%;the continuous breastfeeding rate of 1-year-old children in suburban area decreased from 60.1 to 27.6%.However,from 2005 to 2015,the exclusive breastfeeding rates under 6 months of age increased by 16.0% in urban areas and 5.9% in suburban areas;the continuous breastfeeding rate of 1-year-old children in urban increased from 17.0 to 36.0%.The overall feeding rate of complementary food in infants under 6 months of age declined from 1985 to 2015;the average age at introduction of all complementary foods was around 6 months of age in *** There is an obvious trend on feeding pattern of Chinese *** 1985 to 2005,the breastfeeding rate decreased,the duration time of breastfeeding was shortened and the age at introduction of complementary food was *** 2005 to 2015,the breastfeeding rate increased,the duration time of breastfeeding was prolonged,and the age at introduction of complementary food was postponed.

关键词： Breastfeeding Complementary feeding Infant and young children Secular change

Slow state estimation for singularly perturbed systems with discrete measurements

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Science China(Information Sciences) 2021年第7期64卷 252-254页

作者： Yunli LIU wu-hua CHEN Xiaomei LU College of Mathematics and Information Science Guangxi University

Dear editor,Many real-world systems exhibit a two-time-scale behavior,such as Hindmarsh-Rose oscillators, DC motors, power networks, and other related systems. Such systems can be modeled using singularly perturbed systems(SPSs). To alleviate the difficulties of high dimensionality and stiffness, Kokotovi′c et al. [1] developed the singular perturbation method for reducing the model order, whereby the full system design is divided into designing separate controllers for fast and slow subsystems. In this regard, O'Reilly [2] proposed a composite full-order observer design method for linear SPSs through observer design in two separate time-scales. Later,

关键词： observer design singularly perturbed systems discrete measurements slow manifold reduced-order observer

Transient Stability Analysis of Large-scale Power Systems:A Survey

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CSEE Journal of Power and Energy Systems 2023年第4期9卷 1284-1300页

作者： Qing-hua wu Yuqing Lin Chao Hong Yinsheng Su Tianhao Wen Yang Liu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China the Power Dispatching and Control Center China Southern Power GridGuangzhou 510530China

Transient stability analysis is a key problem in power system operation and *** paper aims at giving a comprehensive review on the modeling ideas and analysis methods for transient stability of large-scale power *** model construction,the general modeling of traditional power systems and special modeling for renewable generations and high-voltage direct-current transmissions are *** transient stability analysis,Lyapunov based methods and non-Lyapunov based methods are thoroughly *** Lya-punov based methods,we focus on the energy function method,the sum-of-squares based method and decentralized stability analysis ***,in non-Lyapunov based methods,the time-domain simulation,extended equal-area criterion and data-driven based methods are *** basic working principles,features and recent research progresses of all the above-mentioned methods are described in *** particular,their performances on several aspects,such as computational speed,conservativeness of stability region estimation or stability margin calculation,and adaptability to various types of system models,are ***,a brief discussion of potential directions for future research on transient stability analysis of large-scale power systems is *** Terms-connective stability,large-scale system analysis,Lyapunov functions,power systems,transient stability analysis.

关键词： connective stability large-scale system analysis Lyapunov functions power systems transient stability analysis

Suzuki cross-coupling reactions over engineered AuPd alloy nanoparticles by recycling scattered light

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Nano Research 2022年第12期15卷 9967-9975页

作者： Ming-Yu Qi hua-Kun wu Masakazu Anpo Zi-Rong Tang Yi-Jun Xu College of Chemistry State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou350116China Department of Applied Chemistry Osaka Prefecture UniversityOsaka599-8531Japan

Photocatalyzed organic transformations have spurred immense interest in synthetic chemistry for the efficient conversion of solar energy into chemical ***,the crucial roles of support,which fixes catalytic sites and improves the light-harvesting ability,are often ignored in photoredox ***,we report the utilization of spherical SiO2 support to engineer AuPd alloy particles(denoted as AuPd/SiO2),conceptually different from traditional methods for tuning optical absorption of plasmonic Au or AuPd particles,to manipulate light-harvesting ability of AuPd particles for highly selective and efficient photocatalytic Suzuki cross-coupling *** this deliberately designed system,typically without the size and shape alternation of AuPd particles,the supported AuPd particles recycle the scattering light from spherical SiO2 support and achieve the significant broad light-harvesting ability instead of the surface plasmon resonance *** engineered AuPd/SiO2 composites by the use of near-field scattering-promoted optical absorption showcase the remarkably enhanced activity for visible-light-induced photocatalytic Suzuki cross-coupling reactions in comparison with that using commercial SiO2 support,highlighting the spherical-support-effect induced efficient utilization of scattered *** work highlights the feasibility of manipulating the light-harvesting capability of bimetallic particles by the near-field scattering-promoted optical absorption model toward efficient photo-driven Suzuki cross-coupling reaction and other C-C coupling organic synthesis to produce high value-added chemicals.

关键词： photocatalysis AuPd alloy particles Suzuki cross-coupling light harvesting surface plasmon resonance

A New Monoterpene Glycoside from Paeonia veitchii

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Chinese Chemical Letters 2002年第5期13卷 430-431页

作者： Shao hua wu Xiao Dong LUO Yun Bao MA Xiao Jiang HAO Da Gang wu Laboratory of Phytochemistry Kunming Institute of BotanyChinese Academy of SciencesKunming 650204

A new monoterpene glycoside, acetoxypaeoniflorin, was isolated from the root cortex of Paeonia veitchii Lynch.. The structure was elucidated by spectral methods.

关键词： Paeonia veitchii Lynch Paeoniaceae monoterpene glycoside acetoxypaeoniflorin.