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| 1 | 苎麻遗传转化再生体系的建立显示文摘苎麻(BoehmerianiveaL.Guad)是荨麻科苎麻属宿根型草本植物,主要分布在热带和亚热带地区,为我国特产,是重要的纺织纤维和饲料作物。由于苎麻为杂合体,其遗传背景十分复杂,有性杂交等常规方法难以取得育种上的突破,因此,探讨利用基因工程技术改良苎麻品种具有重要意义。本研究以苎麻品种圆叶青叶盘为外植体,选用MS培养基为基本培养基,附加激素BA、IAA、GA3和NAA,通过研究不同激素浓度组合对外植体愈伤诱导及不定芽分化的影响以及不同激素配比对生根的作用,建立了较好的遗传转化再生体系。试验结果表明圆叶青叶盘最适诱导愈伤培养基为MS+6-BA2.0mg/L+GA30.4mg/L+IAA0.2mg/L+蔗糖30g/L+琼脂7.5g/L;分化培养基为MS+6-BA2.0mg/L+GA30.4mg/L+蔗糖30g/L+琼脂7.5g/L;小苗的最佳生根培养基为MS+NAA0.2mg/L+IAA0.1mg/L+蔗糖30g/L+琼脂7.5g/L。在抗生素浓度梯度筛选实验中获得50mg/L卡那霉素可以抑制叶盘的分化;40mg/L卡那霉素可以抑制再生植株的生根。筛选出的遗传转化再生体系,为进一步利用基因工程技术对苎麻进行遗传改良打下基础。 | 孔华 郭安平 章霄云 姚庆荣 郭运玲 贺立卡 Kong Hua Guo Anping Zhang Xiaoyun Yao Qingrong Guo Yunling He Lika | 2006 | 分子植物育种2006，4，2： | 16 |
| 2 | 重复经颅磁刺激治疗抑郁症的机制研究进展(英文)显示文摘概述:抑郁障碍是目前最常见的心理健康问题之一。然而,对于该疾病的基于机制的治疗方法仍然是难以捉摸的。重复经颅磁刺激(rTMS)是一种非侵入性的程序,它可以以一种脉冲磁场来刺激大脑中的电活动,被认为是一种有效的抑郁症治疗方式。在这里,我们回顾了关于rTMS治疗抑郁症的临床和基础研究的主要发现,包括它的抗抑郁疗效,基本原理,调节神经回路、神经递质和脑网络、海马神经发生、和突出的功效,以及分子通路。 | Zhengwu PENG Cuihong ZHOU Shanshan XUE Jie BAI Shoufen YU Xiaosa LI Huaning WANG Qingrong TAN | 2018 | 上海精神医学2018，30，2： | 13 |
| 3 | Computing payment for ecosystem services in watersheds: An analysis of the Middle Route Project of South-to-North Water Diversion in China显示文摘Payment for ecosystem services (PES) has attracted considerable attention as an economic incentive for promoting natural resource management recently. As emphasis has been placed on using the incentive-based mechanism by the central government, rapid progress on PES research and practice has been achieved. However PES still faces many difficulties. A key issue is the lack of a fully-fledged theory and method to clearly define the design scope, accounting and feasibility of PES criteria. An improved watershed criteria model was developed in light of research on PES practices in China, investigations on the water source area for the Middle Route Project of South-to-North Water Diversion and ecosystem services outflows theory. The basic principle of assessment is the direct and opportunity cost for ecological conservation and environmental protection in the water source area deduct nationally-financed PES and internal effect. Then the scope and the criteria methods were determined, and internal effect was put forward to define benefits brought from water source area. Finally, Shiyan City, which is the main water source area for the Project of Water Diversion, was analyzed by this model and its payment was calculated. The results showed that: (1) during 2003-2050, the total direct cost and opportunity cost would reach up to 262.70 billion and 256.33 billion Chinese Yuan (CNY, 2000 constant prices), i.e., 50.61% and 49.38% of total cost, respectively; (2) Shiyan City would gain 0.23, 0.06 and 0.03 CNY/m3 in 2014-2020, 2021-2030, and 2031-2050, respectively. | Zhengju Dong Yan Yan Jing Duan Xiao Fu Qingrong Zhou Xiang Huang Xiangen Zhu Jingzhu Zhao | 2011 | Journal of Environmental Sciences2011，23，12： | 12 |
| 4 | Improving the stability and bioavailability of tea polyphenols by encapsulations:a review显示文摘Tea polyphenols(TPPs)have attracted significant research interest due to their health benefits.However,TPPs are sensitive to certain environmental and gastrointestinal conditions and their oral bioavailability was found to be very low.Delivery systems made of food-grade materials have been reported to improve the shelf-life,bioavailability and bioefficacy of TPPs.This review discusses the chemistry of TPPs;the setbacks of TPPs for application;and the strategies to counteract application limitations by rationally designing delivery systems.An overview of different formulations used to encapsulate TPPs is provided in this study,such as emulsion-based systems(liposome,nanoemulsion,double emulsion,and Pickering emulsion)and nano/microparticles-based systems(protein-based,carbohydrate-based,and bi-polymer based).In addition,the stability,bioavailability and bioactivities of encapsulated TPPs are evaluated by various in vitro and in vivo models.The current findings provide scientific insights in encapsulation approaches for the delivery of TPPs,which can be of great value to TPPs-fortified food products.Further explorations are needed for the encapsulated TPPs in terms of their applications in the real food industry as well as their biological fate and functional pathways in vivo. | Zhiya Yin Ting Zheng Chi-Tang Ho Qingrong Huang Qingli Wu Man Zhang | 2022 | Food Science and Human Wellness2022，11，3： | 7 |
| 5 | Graphene-based materials for flexible energy storage devices显示文摘The booming developments in portable and wearable electronics promote the design of flexible energy storage systems. Flexible supercapacitors and batteries as promising energy storage devices have attracted tremendous attention. As the key component of both supercapacitors and batteries, electrode materials with excellent flexibility should be considered to match with highly flexible energy storage devices. Owing to large surface area, good thermal and chemical stability, high conductivity and mechanical flexibility,graphene-based materials have been widely employed to serve as promising electrodes of flexible energy storage devices. Considerable efforts have been devoted to the fabrication of flexible graphene-based electrodes through a variety of strategies. Moreover, different configurations of energy storage devices based on these active materials are designed. This review highlights flexible graphene-based two-dimensional film and one-dimensional fiber supercapacitors and various batteries including lithium-ion, lithium–sulfur and other batteries. The challenges and promising perspectives of the graphene-based materials for flexible energy storage devices are also discussed. | Kena Chen Qingrong Wang Zhiqiang Niu Jun Chen | 2018 | Journal of Energy Chemistry2018，27，1： | 7 |
| 6 | Sulfur nanoparticles encapsulated in reduced graphene oxide nanotubes for flexible lithium-sulfur batteries显示文摘灵活电子设备的快速的开发正在支持灵活精力存储设备的设计。锂硫(Li-S ) 电池为高精力密度精力存储设备被认为候选人同样有希望。因此,灵活 Li-S 电池被需要。在这研究,我们制作了独立减少的 graphene 氧化物 nanotubes 的合成电影由压 RGONTs@S 合成泡沫包了硫 nanoparticles (RGONTs@S ) ,它被把冷熄灭与 freeze-drying 和一个随后的减小过程相结合综合。这些 RGONTs@S 合成电影能是服务自食其力为没有另外的文件夹和传导性的代理人的 Li-S 电池的阴极。他们的互连的管状的结构允许在整个网络和帮助的容易的电子运输限制在控告 / 解除过程期间生产的 polysulfides。作为结果, RGONTs@S 合成电影展出了一个高起始的特定的能力,显著骑车稳定性,和优秀的率能力。更重要地, RGONTs@S 合成电影能在灵活 Li-S 电池用作电极。作为概念的一个证明,软包裹的 Li-S 电池用这些电极被装配,他们以不同弯曲状态显示了稳定的电气化学的性能。 | Kena Chen Jun Cao Qiongqiong Lu Qingrong Wang Minjie Yao Mingming Han Zhiqiang Niu Jun Chen | 2018 | Nano Research2018，11，3： | 6 |
| 7 | Quality control of marine big data——a case study of real-time observation station data in Qingdao显示文摘Offshore waters provide resources for human beings,while on the other hand,threaten them because of marine disasters.Ocean stations are part of offshore observation networks,and the quality of their data is of great significance for exploiting and protecting the ocean.We used hourly mean wave height,temperature,and pressure real-time observation data taken in the Xiaomaidao station(in Qingdao,China)from June 1,2017,to May 31,2018,to explore the data quality using eight quality control methods,and to discriminate the most effective method for Xiaomaidao station.After using the eight quality control methods,the percentages of the mean wave height,temperature,and pressure data that passed the tests were 89.6%,88.3%,and 98.6%,respectively.With the marine disaster(wave alarm report)data,the values failed in the test mainly due to the influence of aging observation equipment and missing data transmissions.The mean wave height is often affected by dynamic marine disasters,so the continuity test method is not effective.The correlation test with other related parameters would be more useful for the mean wave height. | QIAN Chengcheng LIU Aichao HUANG Rui LIU Qingrong XU Wenkun ZHONG Shan YU Le | 2019 | Journal of Oceanology and Limnology2019，37，6： | 6 |
| 8 | Sediment transportation and bed morphology reshaping in Yellow River Delta显示文摘The Yellow River Delta supports the ecological function as a typical estuarine foreshore wetland. The wetland area is changing greatly every year because of sediment deposition and erosion, which influences the wetland function tremendously. Application of environmental fluid dynamics code (EFDC) to the Yellow River Delta is on the basis of the mobile bed dynamic model and wetting-drying process. Careful calibration is carried out for the numerical model which is set up for the Yellow River Delta, the sediment transport process of the model is compatible to the Yellow River situation. The simulated bed elevation by considering the sediment deposition in the Mouth is particularly focused on, the numerical results are in agreement with the measured bed morphology within 1992 2000. Simulation in this paper indicates that most of the sediment deposited just out of the Mouth which makes the mouth move forward into the sea 2.5 km per year. This paper presents good results in simulation of varying sediment deposition and provides further methods to predict the future morphology and area of the Yellow River Delta. | KONG QingRong JIANG ChunBo QIN JunJie GUO Bin | 2009 | Science China(Technological Sciences)2009，52，11： | 6 |
| 9 | Effect of cDNA fragments in different length derived from Potato Virus Y coat protein gene on the induction of RNA-mediated virus resistance显示文摘We have reported that cDNA derived from entire coat protein (CP) gene of potato virus Y (PVY) could induce resistance to PVY infection in transgenic tobacco plants, and the resistance was further demonstrated to be RNA-mediated rather than coat protein-mediated. In this study, we cloned cDNA fragments of 202 bp, 417 bp, and 603 bp in length derived from the 3′ end of the PVY CP gene, and the cDNA fragments were introduced into tobacco (var. NC89) plants via Agrobacterium-mediated transformation system. The results of resistance assay showed that the CP cDNA fragments of 417 bp and 603 bp could confer resistance of the trans-genic plants to PVY infection, but the fragment of 202 bp in length could not. Molecular analysis revealed that the resistance was RNA-mediated, which is believed to be a result of post-transcriptional gene silencing. The results indicate that the length of cDNA fragments needed for resistance induction was located somewhere between 202 bp and 417 bp from the 3′ end of PVY CP gene. | ZHU Junhua ZHU Xiaoping WEN Fujiang BAI Qingrong ZHU Changxiang SONG Yunzhi | 2004 | Science China(Life Sciences)2004，47，4： | 5 |
| 10 | Exploring porous zeolitic imidazolate frame work-8(ZIF-8)as an efficient filler for high-performance poly(ethyleneoxide)-based solid polymer electrolytes显示文摘Nano Research volume 13,pages2259–2267(2020)Cite this article 277 Accesses 1 Altmetric Metrics details Abstract The incorporation of inorganic fillers into poly(ethyleneoxide)(PEO)-based solid polymer electrolytes(SPEs)is well known as a low-cost and effective method to improve their mechanical and electrochemical properties.Porous zeolitic imidazolate framework-8(ZIF-8)is firstly used as the filler for PEO-based SPEs in this work.Due to the introduction of ZIF-8,an ionic conductivity of 2.2×10^−5 S/cm(30℃)is achieved for the composite SPE,which is one order of magnitude higher than that of the pure PEO.ZIF-8 also accounts for the broader electrochemical stability window and lithium ion transference number(0.36 at 60℃)of the composite SPE.Moreover,the improved mechanism of ZIF-8 to the composite SPE is investigated by zeta potential and Fourier transform infrared spectrograph characterizations.The stability at the composite SPE/lithium interface is greatly enhanced.The LiFePO4||Li cells using the composite SPE exhibit high capacity and excellent cycling performance at 60℃,i.e.,85%capacity retention with 111 mA·h/g capacity retained after 350 cycles at 0.5 C.In comparison,the cells using the pure PEO show fast capacity decay to 74 mA·h/g maintaining only 68 capacity.These results indicate that the PEO-based SPEs with ZIF-8 are of great promise for the application in solid-state lithium metal batteries. | Zhiwen Lei Jinlai Shen Weide Zhang Qingrong Wang Jun Wang Yonghong Deng Chaoyang Wang | 2020 | Nano Research2020，13，8： | 5 |
| 11 | Engineering Ruthenium-Based Electrocatalysts for Effective Hydrogen Evolution Reaction显示文摘The investigation of highly effective,durable,and cost-effective electrocatalysts for the hydrogen evolution reaction(HER)is a prerequisite for the upcoming hydrogen energy society.To establish a new hydrogen energy system and gradually replace the traditional fossil-based energy,electrochemical water-splitting is considered the most promising,environmentally friendly,and efficient way to produce pure hydrogen.Compared with the commonly used platinum(Pt)-based catalysts,ruthenium(Ru)is expected to be a good alternative because of its similar hydrogen bonding energy,lower water decomposition barrier,and considerably lower price.Analyzing and revealing the HER mechanisms,as well as identifying a rational design of Ru-based HER catalysts with desirable activity and stability is indispensable.In this review,the research progress on HER electrocatalysts and the relevant describing parameters for HER performance are briefly introduced.Moreover,four major strategies to improve the performance of Ru-based electrocatalysts,including electronic effect modulation,support engineering,structure design,and maximum utilization(single atom)are discussed.Finally,the challenges,solutions and prospects are highlighted to prompt the practical applications of Rubased electrocatalysts for HER. | Yingjie Yang Yanhui Yu Jing Li Qingrong Chen Yanlian Du Peng Rao Ruisong Li Chunman Jia Zhenye Kang Peilin Deng Yijun Shen Xinlong Tian | 2021 | Nano-Micro Letters2021，13，10： | 5 |
| 12 | Template-module assembly to prepare low-molecular-weight gene transport system with enhanced transmembrane capability显示文摘Based on specific host-guest interactions between amine-modified ?-cyclodextrin(CD-TAEA) and functional adamantane(AD) derivatives, a module-template strategy has been proposed for the construction of low-molecular-weight cationic assemblies for gene transport. This strategy offers great flexibility in terms of the introduction of mono- or multi-functionality by the inclusion of one or more adamantane-based modules with the desired functionalities. As proof of concept, phenylboronic acid(PB) containing adamantane(PB-AD) was used as a model module in the hope of offering enhanced cytosolic delivery in consideration of the special affinity of PB groups with cell membranes. The physicochemical properties of the complexes formed with plasmid DNA, such as particle size, zeta potential and morphology were investigated. Confocal laser scanning microscopy and flow cytometry experiments demonstrated the important contribution of the functional PB-AD module to the considerably enhanced intracellular internalization and uptake by cellular nuclei. Compared to the parent CD-TAEA, PB-AD/CDTAEA assemblies mediated higher transfection rates, which were even comparable to that of PEI25K. In addition, PB-AD/CDTAEA displayed much lower cytotoxicity than PEI25K in both 293T and HeLa cell lines. The encouraging results suggest that CD-TAEA can be developed as a powerful template capable of readily accommodating various AD-based modules giving versatile functionalities for improved transfection. | YANG Bin LV Yin WANG QingRong LIU Yun AN Hong FENG Jun ZHANG XianZheng ZHUO RenXi | 2014 | Science China Chemistry2014，57，4： | 4 |
| 13 | Locomotor activity and anxiety status, but not spatial working memory,are affected in mice after brief exposure to cuprizone显示文摘Chronic long-term exposure to cuprizone causes severe brain demyelination in mice,which leads to changes in locomotion,working memory and anxiety.These findings suggest the importance of intact myelin for these behaviors.This study aimed to investigate the possible behavioral changes in mice with mild oligodendrocyte/myelin damage that parallels the white matter changes seen in the brains of patients with psychiatric disporders.We used the cuprizonetreated mouse model to test both tissue changes and behavioral functions(locomotor activity,anxiety status,and spatial working memory).The results showed that mice given cuprizone in their diet for 7 days had no significant myelin breakdown as evaluated by immunohistochemical staining for myelin basic protein,while the number of mature oligodendrocytes was reduced.The number and length of Caspr protein clusters,a structural marker of the node of Ranvier,did not change.The locomotor activity of the cuprizonetreated mice increased whereas their anxiety levels were lower than in normal controls;spatial working memory,however,did not change.These results,for the first time,link emotion-related behavior with mild white matter damage in cuprizone-treated mice. | Handi Zhang Yanbo Zhang Haiyun Xu Lingyan Wang Jinsong Zhao Junhui Wang Zhijun Zhang Qingrong Tan Jiming Kong Qingjun Huang Xin-Min Li | 2013 | Neuroscience Bulletin2013，29，5： | 4 |
| 14 | Research progress in electrospinning engineering for all-solid-state electrolytes of lithium metal batteries显示文摘Owing to safety issue and low energy density of liquid lithium-ion batteries(LIBs),all-solid-state lithium metal batteries(ASLMBs)with unique all-solid-state electrolytes(SEs)have attracted wide attentions.This arises mainly from the advantages of the SEs in the suppression of lithium dendrite growth,long cycle life,and broad working temperature range,showing huge potential applications in electronic devices,electric vehicles,smart grids,and biomedical devices.However,SEs suffer from low lithiumion conductivity and low mechanical integrity,slowing down the development of practical ASLMBs.Nanostructure engineering is of great efficiency in tuning the structure and composition of the SEs with improved lithium-ion conductivity and mechanical integrity.Among various available technologies for nanostructure engineering,electrospinning is a promising technique because of its simple operation,cost-effectiveness,and efficient integration with different components.In this review,we will first give a simple description of the electrospinning process.Then,the use of electrospinning technique in the synthesis of various SEs is summarized,for example,organic nanofibrous matrix,organic/inorganic nanofibrous matrix,and inorganic nanofibrous matrix combined with other components.The current development of the advanced architectures of SEs through electrospinning technology is also presented to provide references and ideas for designing high-performance ASLMBs.Finally,an outlook and further challenges in the preparation of advanced SEs for ASLMBs through electrospinning engineering are given. | Manxi Wang Yaling Wu Min Qiu Xuan Li Chuanping Li Ruiling Li Jiabo He Ganggang Lin Qingrong Qian Zhenhai Wen Xiaoyan Li Ziqiang Wang Qi Chen Qinghua Chen Jinhyuk Lee Yiu-Wing Mai Yuming Chen | 2021 | Journal of Energy Chemistry2021，30，10： | 4 |
| 15 | Correlation between miR-564, TGF-β1, and radiation-induced lung injury显示文摘Objective Our study aimed to analyze the expression of miR-564 and TGF-β1 in cancer tissues and the serum of patients with radiation-induced lung injury,and to investigate the relationship between them and radiation-induced lung injury.Methods In situ hybridization and real-time fluorescence quantitative method were used to detect the expression of miR-564.Additionally,immunohistochemistry and enzyme-linked immunosorbent assay(ELISA)were performed to detect the expression of TGF-β1.Results The overall incidence of acute radiation pneumonia was 55.9%(100/179).The incidence of≥grade 2 radioactive pneumonia was 24.0%(43/179)and that of grade 1 was 31.8%(57/179).The expression of miR-564 in grade≥2 was slightly higher than that in patients without or with grade 1,but there was no statistical difference(P=0.86).The serum level and ratio of miR-564 in patients with grade≥2 were significantly higher than those without or with grade 1(P=0.005,P=0.025,respectively).The expression of TGF-β1 in grade≥2 was significantly higher than that of patients without or with grade 1(P=0.017).The serum levels of TGF-β1 in grade≥2 were significantly higher than those in patients without or with grade 1(P=0.038).Although the ratio of TGF-β1 in radiation pneumonia of grade≥2 was significantly higher than that of without or with grade 1,there was no significant difference(P=0.24).Moreover,patients with higher expression of miR-564 and lower expression of TGF-β1 had better prognosis.Conclusion MiR-564 and TGF-β1 are predictors of radiation-induced lung injury.Monitoring its changing trend can improve the accuracy of predicting radiation-induced lung injury.The levels and ratio of serum miR-564 and TGF-β1 in patients with radiation-induced lung injury are related to the severity of radiationinduced lung injury. | Yunzhang Ge Tao Xie Bin Yang Qianxia Li Qingrong Ren Xiaoyi Zhou Desheng Hu Zhongshu Tu | 2019 | Oncology and Translational Medicine2019，5，5： | 4 |
| 16 | Phase diagrams of permanent magnet alloys: Binary rare earth alloy systems显示文摘Thermodynamic optimization of the binary rare earth alloy(Cee La, Cee Pr, Cee Nd and Lae Nd) systems was performed in this work through the CALPHAD method based on the critical evaluation of all available phase diagram and thermodynamic data reported in the literature. During the thermodynamic modeling, the solution phases including liquid, bcc, fcc and dhcp, were treated as the substitutional solution model. Thermodynamic parameters of the stable phases in the Cee La, Cee Pr, Cee Nd and Lae Nd binary systems are obtained finally and would be used directly to develop the thermodynamic database of the multi-component Nde Fee B-based alloys, which is indispensable for designing alloy compositions and processes of Nde Fee B permanent magnets with highly abundant rare earth metals. | Kaicheng Yang Jiang Wang Qingrong Yao Zhao Lu Maohua Rong Huaiying Zhou Guanghui Rao | 2019 | Journal of Rare Earths2019，37，10： | 3 |
| 17 | Hierarchical LSTM with char-subword-word tree-structure representation for Chinese named entity recognition显示文摘Chinese named entity recognition(CNER)aims to identify entity names such as person names and organization names from Chinese raw text and thus can quickly extract the entity information that people are concerned about from large-scale texts.Recent studies attempt to improve performance by integrating lexicon words into char-based CNER models.These existing studies,however,usually focus on leveraging the context-free words in lexicon without considering the contextual information of words and subwords in the sentences.To address this issue,in addition to utilizing the lexicon words,we further propose to construct a hierarchical tree structure representation composed of characters,subwords and context-aware predicted words from segmentor to represent each sentence for CNER.Based on the tree-structure representation,we propose a hierarchical long short-term memory(HiLSTM)framework,which consists of hierarchical encoding layer,fusion layer and CRF layer,to capture linguistic knowledge at different levels.On the one hand,the interactions within each level help to obtain the contextual information.On the other hand,the propagations from the lower-levels to the upper-levels can provide additional semantic knowledge for CNER.Experimental results on three widely used CNER datasets show that our proposed HiLSTM model achieves significant improvement over several strong benchmark methods. | Chen GONG Zhenghua LI Qingrong XIA Wenliang CHEN Min ZHANG | 2020 | Science China(Information Sciences)2020，63，10： | 3 |
| 18 | Interaction Between Variations in Dopamine D2 and Serotonin 2A Receptor is Associated with Short-Term Response to Antipsychotics in Schizophrenia显示文摘Dear Editor,Schizophrenia is a chronic and debilitating brain disorder,which has a strong genetic component with heritability ranging from 66%to 85%[1,2].Currently,antipsychotic drugs remain the most effective treatment for the psychotic symptoms of schizophrenia[3].Because of the severe sideeffects of first-generation antipsychotics(FGAs),secondgeneration antipsychotics(SGAs)have become more widely used in the treatment of schizophrenia. | Liansheng Zhao Huijuan Wang Yamin Zhang Jinxue Wei Peiyan Ni Hongyan Ren Gang Li Qiang Wang Gavin P Reynolds Weihua Yue Wei Deng Hao Yan Liwen Tan Qi Chen Guigang Yang Tianlan Lu Lifang Wang Fuquan Zhang Jianli Yang Keqing Li Luxian Lv Qingrong Tan Yinfei Li Hua Yu Hongyan Zhang Xin Ma Fude Yang Lingjiang Li Chuanyue Wang Huiyao Wang Xiaojing Li Wanjun Guo Xun Hu Yang Tian Xiaohong Ma Jeremy Coid Dai Zhang Chao Chen Tao Li Chinese Antipsychotics Pharmacogenomics Consortium | 2019 | Neuroscience Bulletin2019，35，6： | 3 |
| 19 | Effects of Sm-doping on microstructure,magnetic and microwave absorption properties of BiFeO_(3)显示文摘In this paper,polycrystalline samples of Bi_(1-x)Sm_(x)FeO_(3)(x=0,0.05,0.1,0.15) were successfully synthesized by sol-gel method.The effects of Sm concentration on the crystal structure,morphology,chemical states,magnetic properties and microwave absorption performance were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),a vibrating sample magnetometer(VSM) and a Vector network analyzer(VNA),respectively.The results show that the rare earth Sm doping causes the crystal structure to change.When x≤0.1,Bi_(1-x)Sm_(x)FeO_(3) is the distorted rhombohedral structure with space group R3c.With the increase of Sm doping amount to x=0.15,the phase structure of Bi_(1-x)Sm_(x)FeO_(3) changes from rhombohedral structure to cubic structure with the space group Pm3 m.The particle size decreases with the increase of the Sm doping amount.The analysis results show that Sm doping can effectively reduce the oxygen vacancies and significantly improve its magnetic properties.The results exhibit that moderately doped rare earth Sm element can effectively improve microwave absorption properties of Bi_(1-x)Sm_(x)FeO_(3) powders.When Sm doping amount of x is 0.1,the Bi_(0.9)Sm_(0.1)FeO_(3) compound has good microwave absorption performance,and the minimum reflection loss value of Bi_(0.9)Sm_(0.1)FeO_(3) powder reaches about-32.9 dB at11.7 GHz,and its effective absorption bandwidth(RL <-10 dB) is 2.6 GHz with the optimal matching thickness of 2.0 mm. | Chuang Tian Qingrong Yao Zhaofei Tong Huaiying Zhou Guanghui Rao Jianqiu Deng Zhongmin Wang Jiang Wang | 2021 | Journal of Rare Earths2021，39，7： | 3 |
| 20 | Using PyC modified 3D carbon fiber to reinforce UHTC under low temperature sintering without pressure显示文摘Finding the optimum balance between strength and toughness,as well as acquiring reliable thermal shock resistance and oxidation resistance,has always been the most concerned topic in the discussion of ultra-high temperature ceramic composites.Herein,PyC modified 3D carbon fiber is used to reinforce ultra-high temperature ceramic(UHTC).The macroscopic block composite with large size is successfully fabricated through low temperature sintering at 1300℃without pressure.The prepared PyC modified 3D C_(f)/ZrC-SiC composites simultaneously possess excellent physical and chemical stability under the synergistic effect of PyC interface layer and low temperature 1/2 sintering without pressure.The fracture toughness is increased in magnitude to 13.05±1.72 MPa·m^(1/2)accompanied by reliable flexural strength of 251±27 MPa.After rapid thermal shock spanning from room temperature(RT)to 1200℃,there are no visible surface penetrating cracks,spalling,or structural fragmentation.The maximum critical temperature difference reaches 875℃,which is nearly three times higher than that of traditional monolithic ceramics.The haunting puzzle of intrinsic brittleness and low damage tolerance are resolved fundamentally.Under the protection of PyC interface layer,the carbon fibers around oxide layer and matrix remain structure intact after static oxidation at 1500℃for 30 min.The oxide layer has reliable physical and chemical stability and resists the erosion from fierce oxidizing atmosphere,ensuring the excellent oxidation resistance of the composites.In a sense,the present work provides promising universality in designability and achievement of 3D carbon fiber reinforced ceramic composites. | Baihe DU Yuan CHENG Liancai XUN Shuchang ZHANG Jing TONG Qingrong LV Shanbao ZHOU Ping HU Xinghong ZHANG | 2021 | Journal of Advanced Ceramics2021，10，4： | 3 |
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