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| 1 | The high-resolution climate recorded in the δ^(18)O of Porites lutea from the Nansha Islands of China显示文摘A Porites lutea core from Yongshu Reef of Nansha Islands covering 50 years growth history was ana-ly/ed for oxygen isotopic composition with monthly and seasonally resolution. The calibration of the δ18O with the instrumental temperature indicated that the coral δ18O is a good indicator for sea surface temperature (SST) and air temperature (t). It can be used to reconstruct the SST and air temperature of the Yongshu Reef sea area. In addition, the coral δ18O provides signatures for the intensity of the East Asia monsoon and it is a record for the activities of El Nino events. With the calibrated SST and air temperature formulas, the most recent fifty years SST and air temperature were reconstructed based on the coral δ18O, thus back up the understanding of the climate of Nansha Islands to 1950. far beyond the limit of the instrumental recording since September 1988. It was found that, in general, increasing 1℃ air temperature results in 0.24‰decrease in skeletal δ18O. | YU Kefu, CHEN Tegu, HUANG Dingcheng, ZHAO Huanting, ZHONG Jinliang & LIU Dongsheng (LIU Tungsheng)South China Sea Institute of Oceanoiogy, Chinese Academy of Sciences. Guangzhou 510301, China:Geology and Geophysics Institute. Chinese Academy of Sciences, Beijing 100029, China | 2001 | Chinese Science Bulletin2001，46，24： | 10 |
| 2 | Enhanced orange emission by doping CeB_6 in CaAlSiN_3:Ce^(3+) phosphor for application in white LEDs显示文摘A series of CeB6-doped and CeO_2-doped Ca_(1-x)SiAlN_3:xCe3+(denoted as CASN:Ce3+@CeB6 and CASN:Ce3+@CeO_2, respectively) were synthesized by alloy-nitridation method under high-purity nitrogen atmosphere. The morphologies, crystal phases, and luminescence properties were investigated in detail.With an increase in the concentration of CeB_6, the unit cell volume of CASN:Ce3+@CeB_6 slightly increases due to the substitution between ions, which leads to a change of micro structure around Ce3+. CASN:Ce3+@CeB6 efficiently emits yellow-orange light with a maximum emission intensity at around 550 nm for the content x of 0.01(being in comparable situation, CASN:Ce3+@CeO_2 is x = 0.04) when excited at460 nm. Compared with CASN:Ce3+@CeO_2, the red emission component of Ce3+ in CASN:Ce3+@CeB6 is much stronger. This is ascribed to energy transfer of intra-Ce3+(within one Ce3+ ion) and inter-Ce3+(between Ce3+ and Ce3+ ions). In addition, the replacements of N3-(0.132 nm for CN = 4) and O^(2-)(0.124 nm for CN = 4) by B^(2-)(0.140 nm for CN = 4), which can lead to a marked expansion of the host lattice and a decrease of the oxidation of samples, are also responsible for the increase of red emission component. Furthermore, CASN:Ce3+@CeB_6 phosphor has an excellent thermal stability because of the partial substitution of Ce-O(Ce-N) bonds by more covalent Ce-B. As a result, the outstanding luminescent properties of CASN:Ce3+@CeB6 phosphor make it practical to use in the single phosphor-coated high-color-rendering power white LED. | Wenjie Wu Kefu Chao Wenquan Liu Lesi Wei Dahai Hu Taiyang Wang O. Tegus | 2018 | Journal of Rare Earths2018，36，12： | 6 |
| 3 | Non-thermal plasma treatment of Radix aconiti wastewater generated by traditional Chinese medicine processing显示文摘The wastewater effluent from Radix aconiti processing, an important step in the production processes of traditional Chinese medicine(TCM), is a type of toxic wastewater and difficult to treat. Plasma oxidation methods have emerged as feasible techniques for effective decomposition of toxic organic pollutants. This study examined the performance of a plasma reactor operated in a dielectric barrier discharge(DBD) to degrade the effluent from R. aconiti processing. The effects of treatment time, discharge voltage, initial p H value and the feeding gas for the reactor on the degradation of this TCM wastewater were investigated. A bacterium bioluminescence assay was adopted in this study to test the toxicity of the TCM wastewater after non-thermal plasma treatment. The degradation ratio of the main toxic component was 87.77% after 60 min treatment with oxygen used as feed gas and it was 99.59% when the initial p H value was 8.0. High discharge voltage and alkaline solution environment were beneficial for improving the degradation ratio. The treatment process was found to be capable of reducing the toxicity of the wastewater to a low level or even render it non-toxic. These experimental results suggested that the DBD plasma method may be a competitive technology for primary decomposition of biologically undegradable toxic organic pollutants in TCM wastewater. | Yiyong Wen Jianping Yi Shen Zhao Song Jiang Yuming Chi Kefu Liu | 2016 | Journal of Environmental Sciences2016，28，6： | 4 |
| 4 | Role,path,and vision of“5G+BDS/GNSS”显示文摘Communication,positioning,navigation,and decision-making abilities have evolved into Positioning,Navigation,and Timing(PNT)intelligence during the long process of human migration and hence promoted human evolution.This article defines intelligence and smartness from the perspective of biological intelligence.New requirements as a result of the development of communication,navigation,time service,and decision making are identified in this study.The article points out that there are many radio PNT service methods,such as 5G,the new-generation high-speed communication networks and the low-latency and ubiquitous mobile communication networks as well as Global Navigation Satellite System(GNSS),but the integrated application is especially important in providing technical support for the adjustment and control of the physical world by intelligent sensing,cognition,decision-making,and precise coordination.The fusion of 5G and GNSS[including BeiDou Navigation Satellite System(BDS)]information with the corresponding equipment can be embedded into a machine to make it intelligent.Furthermore,the fused information of 5G and GNSS together with the environment information may extend human perception and physical world control ability in terms of time and space scale.It will help to develop critical information infrastructure in the age of intelligence,which will also extend the definition of artificial intelligence.Additionally,the“5G+BDS/GNSS”fusion path is analyzed explicitly herein in terms of realization methods,information processing,and new application services.On the whole,the application of“5G+BDS/GNSS+satellite-based communication”as a critical infrastructure for land,sea,air,space and network spatiotemporal control rights is proposed. | Jingnan Liu Kefu Gao Wenfei Guo Jingsong Cui Chi Guo | 2020 | Satellite Navigation2020，1，1： | 2 |
| 5 | Vacancy manipulating of molybdenum carbide MXenes to enhance Faraday reaction for high performance lithium-ion batteries显示文摘“Intrinsic”strategies for manipulating the local electronic structure and coordination environment of defect-regulated materials can optimize electrochemical storage performance.Nevertheless,the structure–activity relationship between defects and charge storage is ambiguous,which may be revealed by constructing highly ordered vacancy structures.Herein,we demonstrate molybdenum carbide MXene nanosheets with customized in-plane chemical ordered vacancies(Mo_(1.33)CT_(x)),by utilizing selective etching strategies.Synchrotron-based X-ray characterizations reveal that Mo atoms in Mo1.33CTx show increased average valence of+4.44 compared with the control Mo_(2)CT_(x).Benefited from the introduced atomic active sites and high valence of Mo,Mo_(1.33)CT_(x)achieves an outstanding capacity of 603 mAh·g^(−1)at 0.2 A·g^(−1),superior to most original MXenes.Li+storage kinetics analysis and density functional theory(DFT)simulations show that this optimized performance ensues from the more charge compensation during charge–discharge process,which enhances Faraday reaction compared with pure Mo_(2)CT_(x).This vacancy manipulation provides an efficient way to realize MXene’s potential as promising electrodes. | Xin Guo Changda Wang Wenjie Wang Quan Zhou Wenjie Xu Pengjun Zhang Shiqiang Wei Yuyang Cao Kefu Zhu Zhanfeng Liu Xiya Yang Yixiu Wang Xiaojun Wu Li Song Shuangming Chen Xiaosong Liu | 2022 | Nano Research Energy2022，1，3： | 2 |
| 6 | Research on the Numerical Simulation of the Tempering Process of Steel显示文摘In this paper, the kinetics and creeping behavior in the tempering of were experimentally investigated in detail with two kinds of large-forging steel. The martensitic and bainitic transformations were expressed as functions of the tempering parameter. The kinetics of phase transformation of the retained austenite was described by the Avrami equation. Based on the elastoplastic-creeping theory, the constitutive relations for steel tempering process were obtained, and an FEM code was developed. The program was verified with the tempering process of a cylindrical specimen, and the quenching-tempering process of a turbine rotator was analyzed. | Wei Shi, Xuejun Xu, Kefu Yao, Zhuang Liu Mechanical Engineering Department, Tsinghua University, Beijing 100084, China | 2000 | Journal of Shanghai Jiaotong university(Science)2000，5，1： | 2 |
| 7 | A tunable electromagnetic vibration ab- sorber: Characterization and application 显示文摘 | Jie Liu Kefu Liu | 2006 | Journal of Sound and Vibration2006，295，4： | 1 |
| 8 | Control of a Unique Active Vibration Isolator with a Phase Compensation Technique and Automatic on/off Switching显示文摘 | Coppola G Liu Kefu | | 0，，25： | 1 |
| 9 | Novel Adaptive Neural Control Design for Nonlinear MIMO Time-Delay Systems显示文摘 | Chen Bing Liu Xiaoping Liu Kefu | | 0，，06： | 1 |
| 10 | Direct Adaptive Fuzzy Control of Nonlinear Strict-feedback Systems显示文摘 | CHEN Bing LIU Xiaoping LIU Kefu | 2009 | Automatica2009，45，6： | 1 |
| 11 | Adaptive Fuzzy Tracking Control of Nonlinear Time-Delay Systems with Unknown Virtual Control Coefficients显示文摘 | Wang Min Chen Bing Liu Kefu | | 0，，22： | 1 |
| 12 | Microstructural evolution in high power laser cladding of Stellite 6 WC layers 显示文摘 | Zhong Minlin Liu Wenjin Yao Kefu | 2002 | Surface and Coatings Technology2002，157，： | 1 |
| 13 | Direct adaptive fuzzy control of nonlinear strict-feedback systems显示文摘 | CHEN Bing LIU Xiaoping LIU Kefu | 2009 | Automatica2009，45，： | 1 |
| 14 | Microstructure, phase stability and mechanical properties of Nb–Ni–Ti–Co–Zr and Nb–Ni–Ti–Co–Zr–Hf high entropy alloys显示文摘Owning to their excellent thermal stability and high strength at elevated temperature,high entropy alloys(HEAs) possess great potential for the application in aviation and aerospace fields.In present work,two novel Nb-Ni-Ti-Co-Zr and Nb-Ni-Ti-Co-Zr-Hf HEAs were prepared by arc melting and copper mold suction-casting method.The microstructure,phase stability,mechanical properties at room temperature and elevated temperature of the two HEAs were studied.Both of the HEAs possess high yield stress at room temperature,especially for the Nb-Ni-Ti-Co-Zr(with 2331 Mpa).In addition,the Nb-Ni-Ti-Co-Zr HEA exhibited high yield stress of 564 Mpa at elevated temperature of 800 ℃ and large compressive plastic strain(more than 50%at 800 ℃).Nb-Ni-Ti-Co-Zr-Hf alloy showed new phase precipitation at 800 ℃,whereas the structure of Nb-Ni-Ti-Co-Zr was more stable,which is one of the reason why it possesses high strength at room temperature and elevated temperature.The high temperature properties of the Nb-Ni-Ti-Co-Zr HEA make it promising for high temperature application. | Zhidong Han Xue Liu Shaofan Zhao Yang Shao Jinfeng Li Kefu Yao | 2015 | Progress in Natural Science:Materials International2015，25，5： | 1 |
| 15 | Spark model of pulsed discharge in water 显示文摘 | LU Xinpei PAN Yuan LIU Kefu | 2002 | Journal of Applied Physics2002，91，1： | 1 |
| 16 | High-frequency winter cooling and reef coral mortality during the Holocene climatic optimum显示文摘 | Yu Kefu Zhao Jianxin Liu Tungsheng | 2004 | Earth and Planetary Science Letters2004，224，12： | 1 |
| 17 | Microstructural evolution in high power laser cladding of Stellite 6+WC layers显示文摘 | Zhong Minlin Liu Wenjin Yao Kefu | 2002 | Surface and Coatings Technology2002，157，： | 1 |
| 18 | Effects of Er^3+ concentration on UV/blue upconverted luminescence and a three-photon process in the cubic nanocrystalline Y2O5 : Er^3+ 显示文摘 | Wang Xin Shah Guiye Chao Kefu Zhang Youlin Liu Ruilin Feng Liyun Zeng Qinghui Sun Yajuan Liu Yichun Kong Xianggui | 2006 | Materials Chemistry and Physics2006，99，23： | 1 |
| 19 | Extension of modal analysis to linear time-varying system 显示文摘 | Liu Kefu | 1999 | Journal of Sound and Vibration1999，226，1： | 1 |
| 20 | Identification of linear time-varying system 显示文摘 | Liu Kefu | 1997 | Journal of Sound and Vibration1997，206，4： | 1 |
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