|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Palaeoproterozoic Khondalite Belt in the western North China Craton: New evidence from SHRIMP dating and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ul-Helan Mountains area显示文摘Zircom U-Pb age and Hf isotope analyses were made on gneissic granite and garnet-mica two-feldspar gneiss from the Helanshan Group in the Bayan Ul-Helan Mountains area, the western block of the North China Craton (NCC). Zircons from the gneissic granite commonly show core-mantle-rim structures, with magmatic core, metamorphic mantle and rim having ages of 2323±20 Ma, 1923±28 Ma and 1856±12 Ma, respectively. The core, mantle and rim show similar Hf isotope compositions, with single-stage depleted mantle model ages (TDM1) of 2455 to 2655 Ma (19 analyses). Most of the detrital zircons from the garnet-mica two-feldspar paragneiss have a concentrated U-Pb age distribution, with a weighted mean 207Pb/206Pb age of 1978±17 Ma. A few detrital zircons are older (2871 to 2469 Ma). The age for metamorphic overgrown rim was not determined because of strong Pb loss due to their high U content. The zircons show large variation in Hf isotope composition, with TDM1 ages of 1999 to 3047 Ma. In com- bination with previous studies, the main conclusions are as follows: (1) protolith of the khondalite se- ries in the Helanshan Group formed during Palaeoproterozoic rather than the Archaean as previously considered; (2) The results lend support to the contention that there is a huge Palaeoproterozoic Khondalite (metasedimentary) Belt between the Yinshan Mountains Block and the Ordos Block in the Western Block of NCC; (3) The widely-distributed bodies of early Palaeoproterozoic orthogneisses in the Khondalite Belt might be one of the important sources for detritus material in the khondalite series; (4) Collision between the Yinshan Block, the Ordos Block and the Eastern Block occurred in the same tectonothermal event of late Palaeoproterozoic, resulting in the final assembly of the NCC. | DONG ChunYan LIU DunYi LI JunJian WAN YuSheng ZHOU HongYing LI ChengDong YANG YueHeng XIE LieWen | 2007 | Chinese Science Bulletin2007，52，21： | 52 |
| 2 | Asymptotic normality and strong consistency of maximum quasi-likelihood estimates in generalized linear models显示文摘In a generalized linear model with q × 1 responses, the bounded and fixed (or adaptive) p × q regressors Zi and the general link function, under the most general assumption on the minimum eigenvalue of ∑ni=1 ZiZ'i, the moment condition on responses as weak as possible and the other mild regular conditions, we prove that the maximum quasi-likelihood estimates for the regression parameter vector are asymptotically normal and strongly consistent. | YIN Changming, ZHAO Lincheng & WEI Chengdong School of Mathematics and Information Science, Guangxi University, Manning 530004, China Department of Statistics and Finance, University of Science and Technology of China, Hefei 230026, China Department of Mathematics, Guangxi Teacher College, Manning 530001, China | 2006 | Science China Mathematics2006，49，2： | 13 |
| 3 | Effects of high temperature on the microstructure and mechanical behavior of hard coal显示文摘Coal is a common porous sedimentary rock whose microstructure and mechanical behavior are often affected by high temperature.In order to deeply investigate the effect of high temperature on the structure and mechanical properties of coal,six groups of coal samples with different heating temperatures were prepared.Various testing methods,including ultrasonic test,scanning electron microscopy,nuclear magnetic resonance and uniaxial compression test,were used in this study.The results showed that the physical and chemical change processes of coal samples under high temperature can be divided into two stages:the stage of drying and degassing and the stage of pyrolysis of the coal matrix.With the increase of heating temperature,the total porosity of coal samples increases,while the integrity and the deformation resistance of coal samples decrease.In addition,the elastic modulus and uniaxial compressive strength of the coal sample decrease with the increase of heating temperature.The Poisson’s ratio decreases firstly and then increases with the increase of heating temperature. | Chengdong Su Jiadong Qiu Qiuhong Wu Lei Weng | 2020 | International Journal of Mining Science and Technology2020，30，5： | 11 |
| 4 | Identification and characterization of rice blast resistance gene Pid4 by a combination of transcriptomic profiling and genome analysis显示文摘Map-based cloning of plant disease resistance (R) genes is time-consuming. Here, we reported the isolation of blast R gene Pid4 using comparative transcriptomic profiling and genome-wide sequence analysis. Pid4 encodes a coiled-coil nucleotide-binding site leucine-rich repeat(CC-NBS-LRR) protein and is constitutively expressed at diverse developmental stages in the rice variety Digu. The Pid4 protein is localized in both the nucleus and cytoplasm. Introduction of Pid4 into susceptible rice cultivars confers race-specific resistance to leaf and neck blast. Amino acid sequence comparison and blast resistance spectrum tests showed that Pid4 is a novel R gene, different from the previously reported R genes located in the same gene cluster. A Pid4 Indel marker was developed to facilitate the identification of Pid4 in different rice varieties. We demonstrated that a plant R gene can be quickly isolated using transcriptomic profiling coupled with genome-wide sequence analysis. | Zhixiong Chen Wen Zhao Xiaobo Zhu Chengdong Zou Junjie Yin Mawsheng Chern Xiaogang Zhou Heng Ying Xin Jiang Yongzhen Li Haicheng Liao Mengping Cheng Weitao Li Min He Jing Wang Jichun Wang Bingtian Ma Jirui Wang Shigui Li Lihuang Zhu Xuewei Chen | 2018 | Journal of Genetics and Genomics2018，45，12： | 7 |
| 5 | Complex interplay between formation routes and natural organic matter modification controls capabilities of C_(60)nanoparticles(nC_(60)) to accumulate organic contaminants显示文摘Accumulation of organic contaminants on fullerene nanoparticles(nC_(60)) may significantly affect the risks of C_(60) in the environment.The objective of this study was to further understand how the interplay of nC_(60) formation routes and humic acid modification affects contaminant adsorption of nC_(60).Specifically,adsorption of 1,2,4,5-tetrachlorobenzene(a model nonionic,hydrophobic organic contaminant) on nC_(60) was greatly affected by nC_(60)formation route- the formation route significantly affected the aggregation properties of nC_(60),thus affecting the available surface area and the extent of adsorption via the pore-filling mechanism.Depending on whether nC_(60) was formed via the 'top-down' route(i.e.,sonicating C_(60) powder in aqueous solution) or 'bottom-up' route(i.e.,phase transfer from an organic solvent) and the type of solvent involved(toluene versus tetrahydrofuran),modification of nC_(60) with Suwannee River humic acid(SRHA) could either enhance or inhibit the adsorption affinity of nC_(60).The net effect depended on the specific way in which SRHA interacted with C_(60) monomers and/or C_(60) aggregates of different sizes and morphology,which determined the relative importance of enhanced adsorption from SRHA modification via preventing C_(60) aggregation and inhibited adsorption through blocking available adsorption sites.The findings further demonstrate the complex mechanisms controlling interactions between nC_(60) and organic contaminants,and may have significant implications for the life-cycle analysis and risk assessment of C_(60). | Lei Hou John D.Fortner Ximeng Wang Chengdong Zhang Lilin Wang Wei Chen | 2017 | Journal of Environmental Sciences2017，29，1： | 5 |
| 6 | A fast and effective method to perform paternity testing for Wolong giant pandas显示文摘Captive populations provide a precious genetic resource for endangered animals and a source of individuals for reintroduction to depleted habitats. Therefore, accuracy in determining paternity is of vital importance for managing captive populations and in selecting representative individuals of known genetic characteristics for release. In this study, we established a fast and effective method to conduct paternity testing for captive giant pandas in the Wolong population. This technique uses two highly polymor phic microsatellites initially, subsequent use of five less polymorphic markers and then paternity exclusion testing carried out using the giant panda paternity exclusion program we have developed. Our results revealed that (1) both sets of markers success- fully identified the real fathers in 25 cases of paternity testing and (2) the success rate of paternity exclusion varied with the degree of polymorphism of the markers used. Subsequently, we conducted correlation analysis between the success rates of paterni- ty identification with these markers, parameters of genetic diversity and tests of neutrality. We found that the paternity exclusion power of microsatellites was significantly correlated with the number of alleles (Na), expected heterozygosity (HE) and observed homozygosity statistic (FO) (all P < 0.05). From this, we developed a new variable, Na?HE/FO, showing a highly significant positive correlation with the resolution power of microsatellites (P = 0.001). Moreover, the first two highly polymorphic loci gave a 100% success rate of excluding non-paternal males because they yielded higher values of Na?HE/FO than the other five less pol- ymorphic markers. Thus, the Na?HE/FO parameter appears suitable to serve as a criterion for selecting microsatellite markers, which could be used for high-resolution molecular techniques of paternity determination among a range of captive animals besides giant pandas. | LI DeSheng CUI HengMin WANG ChengDong LING ShanShan HUANG Zhi ZHANG HeMin | 2011 | Chinese Science Bulletin2011，56，24： | 4 |
| 7 | Viscoelasticity of repaired sciatic nerve by poly(lactic-co-glycolic acid) tubes显示文摘Medical-grade synthetic poly(lactic-co-glycolic acid) polymer can be used as a biomaterial for nerve repair because of its good biocompatibility,biodegradability and adjustable degradation rate.The stress relaxation and creep properties of peripheral nerve can be greatly improved by repair with poly(lactic-co-glycolic acid) tubes.Ten sciatic nerve specimens were harvested from fresh corpses within 24 hours of death,and were prepared into sciatic nerve injury models by creating a 10 mm defect in each specimen.Defects were repaired by anastomosis with nerve autografts and poly(lactic-co-glycolic acid) tubes.Stress relaxation and creep testing showed that at 7 200 seconds,the sciatic nerve anastomosed by poly(lactic-co-glycolic acid) tubes exhibited a greater decrease in stress and increase in strain than those anastomosed by nerve autografts.These findings suggest that poly(lactic-co-glycolic acid) exhibits good viscoelasticity to meet the biomechanical requirements for a biomaterial used to repair sciatic nerve injury. | Chengdong Piao Peng Li Guangyao Liu Kun Yang | 2013 | Neural Regeneration Research2013，8，33： | 4 |
| 8 | Fabrication of single-walled carbon nanotube-based highly sensitive gas sensors显示文摘A highly sensitive single-walled carbon nanotube(SWCNT)-based ammonia(NH3) gas detector is manufactured by orderly assembling SWCNT using the dielectrophoretical(DEP) technology.Atom force microscopy(AFM) and scanning electron microscopy(SEM) images revealed that SWCNTs were assembled between the microelectrodes.SWCNTs were affected by the electrophoretic force which was carried out by the related theoretical analysis in a nonuniform electric field.The SWCNT field effect transistors geometry was obtained.The electrical performance of NH3 gas sensor with the SWCNT field effect transistors geometry was tested before and after the adoption of NH3 at room temperature.Experimental results indicated that the efficient assembly of SWCNT was obtained by the applied alternating current voltage with frequency of 2 MHz and amplitude of 10 V.The SWCNTs-based gas sensor had high sensitivity to NH3,and the electrical conductance of NH3 gas sensor reduced two times after interaction with NH3.The SWCNTs surface gas molecules were removed by means of ultraviolet ray irradiation for 10 min.Hence,the fabricated NH3 gas sensor could be reversible.There is a clear evidence that the adsorption of NH3 on the SWCNT channel is easy to be realized.Our theoretical results are consistent with recent experiments. | XU Ke TIAN XiaoJun WU ChengDong LIU Jian LI MengXin SUN Ying WEI FaNan | 2013 | Science China(Technological Sciences)2013，56，1： | 4 |
| 9 | Active tension optimal control for WT wheelchair robot by using a novel control law for holonomic or nonholonomic systems显示文摘The characteristics of interaction between WT wheelchair robot and stair environments is analyzed and possible patterns of WT wheelchair robot during the stair-climbing process are summarized, with criteria to determine the pattern of the wheelchair robot proposed. Aiming at the complicated mechanism of WT wheelchair robot with holonomic constraints and combining it with the dynamic programming, namely the Hamilton-Jacobi equation, a new control law called active tension optimal control is presented for holonomic or nonholonomic robotic systems, based on which one can make the wheelchair robot with a holonomic or nonholonomic mechanism track the expected reference input of constraint forces of holonomic or nonholinomic constraints as well as track the expected reference input of the generalized coordinate of each joint. The module STATEFLOW in MATLAB is used to simulate the entire stair-climbing process of WT wheelchair robot, and comparison is made between the output curves of each joint and the tension of the track and the expected reference input curves, which verifies the effectiveness of the proposed control law. | WANG Jian WANG Ting YAO Chen LI XiaoFan WU ChengDong | 2014 | Science China(Information Sciences)2014，57，11： | 3 |
| 10 | Study of deformation and aging behaviors of a hot rolled–quenched Cu–Cr–Zr–Mg–Si alloy during thermomechanical treatments显示文摘 | Chengdong Xia Yanlin Jia Wan Zhang Ke Zhang Qiyi Dong Genying Xu Mingpu Wang | 2012 | Materials and Design2012，，： | 3 |
| 11 | New Zircon U-Pb Age of Granodiorite from the Shayikenbulake Be Deposit in Altay, Xinjiang and its Significance显示文摘Objective Intrusive rocks are widely distributed in Altay,Xinjiang,and appear in every structural belt.The rocks are mainly granite(Song Peng et al.,2017),which formed from 523 Ma to 202 Ma and can be divided into five periods:479–421 Ma,410–370 Ma,368–313 Ma,300–252 Ma and 247–202 Ma.However,intrusive | LI Qiang YANG Fuquan YANG Chengdong | 2018 | Acta Geologica Sinica(English Edition)2018，92，2： | 3 |
| 12 | A new Cu^(2+)-induced color reaction of a rhodamine derivative N-(3-carboxy)acryloyl rhodamine B hydrazide显示文摘A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible non-fluorescent absorption upon coordination to Cu2+,which is a rather unusual phenomenon for rhodamine B derivatives.Stoichiometric measurements using the Job's method and the molar ratio method reveal that one CARB molecule combines two Cu2+ ions,and the two Cu2+ ions play different roles:one opens the spirocyclic structure and the other quenches the fluorescence of the xanthene moiety.This reaction mechanism is supported by a comparative study on the model compound N-acryloyl rhodamine B hydrazide as well as by the density functional theory calculations.Furthermore,the absorption response of CARB is highly selective for Cu2+ over other common ions,which implies that CARB may be used as a colorimetric probe for the rapid visual detection of Cu2+. | SUN ChengDong CHEN JianMing MA HuiMin LIU Yang ZHANG JingHua LIU QingJun | 2011 | Science China Chemistry2011，54，7： | 3 |
| 13 | Numerical Study of Effect of Compressor Swirling Flow on Combustor Design in a MTE显示文摘An effect of the swirling flow on the combustion performance is studied by the computational fluid dynamics(CFD) in a micro-gas turbine with a centrifugal compressor, dump diffuser and forward-flow combustor. The distributions of air mass and the Temperature Pattern Factor(as: Overall Temperature Distribution Factor-OTDF) in outlet are investigated with two different swirling angles of compressed air as 0° and 15° in three combustors. The results show that the influences of swirling flow on the air distribution and OTDF cannot be neglected. Compared with no-swirling flow, the air through outer liner is more, and the air through the inner liner is less, and the pressure loss is bigger under the swirling condition in the same combustor. The Temperature Pattern Factor changes under the different swirling conditions. | MU Yong WANG Chengdong LIU Cunxi LIU Fuqiang HU Chunyan XU Gang ZHU Junqiang | 2017 | Journal of Thermal Science2017，26，4： | 3 |
| 14 | Study on the large-scale assembly and fabrication method for SWCNTs nano device显示文摘The large-scale assembly and fabrication method for single-walled carbon nanotube(SWCNT) nano devices was implemented.Assembly of SWCNT field effect transistor(FET) was realized by floating potential dielectrophoresis approach.The simulation of floating potential distribution of the chip was performed by comsol multiphysics coupling software.Six hundred devices were assembled on the area of less than one square centimeter.The fabricated devices were characterized by atomic force microscopy and scanning electron microscopy.The experimental results showed that large-scale assembly had been realized,and the success rate of ideal assembly for SWCNT FET had been assessed. | XU Ke TIAN XiaoJun WU ChengDong LIU Jian LI MengXin DONG ZaiLi | 2013 | Science China Chemistry2013，56，3： | 3 |
| 15 | An enhanced least squares residual RAIM algorithm based on optimal decentralized factor显示文摘The Least Squares Residual(LSR)algorithm is commonly used in the Receiver Autonomous Integrity Monitoring(RAIM).However,LSR algorithm presents high Missed Detection Risk(MDR)caused by a large-slope faulty satellite and high False Alert Risk(FAR)caused by a small-slope faulty satellite.In this paper,the LSR algorithm is improved to reduce the MDR for a large-slope faulty satellite and the FAR for a small-slope faulty satellite.Based on the analysis of the vertical critical slope,the optimal decentralized factor is defined and the optimal test statistic is conceived,which can minimize the FAR with the premise that the MDR does not exceed its allowable value of all three directions.To construct a new test statistic approximating to the optimal test statistic,the Optimal Decentralized Factor weighted LSR(ODF-LSR)algorithm is proposed.The new test statistic maintains the sum of pseudo-range residual squares,but the specific pseudo-range residual is weighted with a parameter related to the optimal decentralized factor.The new test statistic has the same decentralized parameter with the optimal test statistic when single faulty satellite exists,and the difference between the expectation of the new test statistic and the optimal test statistic is the minimum when no faulty satellite exists.The performance of the ODFLSR algorithm is demonstrated by simulation experiments. | Guanghui SUN Chengdong XU Dan SONG Yimei JIAN | 2020 | Chinese Journal of Aeronautics2020，33，12： | 3 |
| 16 | Selection of magnetic anion exchange resins for the removal of dissolved organic and inorganic matters显示文摘Four magnetic anion exchange resins (MAERs) were used as adsorbents to purify drinking water. The effect of water quality (pH, temperature, ionic strength, etc.) on the performance of MAER for the removal of dissolved organic matter (DOM) was also investigated. Among the four studied MAERs, the strong base resin named NDMP-1 with high water content and enhanced exchange capacity exhibited the highest removal rate of dissolved organic carbon (DOC) (48.9% removal rate) and UV-absorbing substances (82.4% removal rate) with a resin dose of 10 mL/L after 30 min of contact time. The MAERs could also effectively remove inorganic matter such as sulfate, nitrate and fluoride. Because of the higher specific UV absorbance (SUVA) value, the DOM in the raw water was found to be removed more effectively than that in the clarified water by NDMP resin. The temperature showed a weak influence on the removal of DOC from 6 to 26°C, while a relatively strong one at 36°C. The removal of DOM by NDMP was also affected to some extent by the pH value. Moreover, increasing the sulfate concentration in the raw water could decrease the removal rates of DOC and UV-absorbing substances. | Qiongjie Wang Aimin Li Jinnan Wang Chengdong Shuang | 2012 | Journal of Environmental Sciences2012，24，11： | 2 |
| 17 | High strength and high electrical conductivity Cu–Cr system alloys manufactured by hot rolling–quenching process and thermomechanical treatments显示文摘 | Chengdong Xia Wan Zhang Zhanyuan Kang Yanlin Jia Yifeng Wu Rui Zhang Genying Xu Mingpu Wang | 2012 | Materials Science & Engineering A2012，，： | 2 |
| 18 | Dual-Branch-UNet: A Dual-Branch Convolutional Neural Network for Medical Image Segmentation显示文摘In intelligent perception and diagnosis of medical equipment,the visual and morphological changes in retinal vessels are closely related to the severity of cardiovascular diseases(e.g.,diabetes and hypertension).Intelligent auxiliary diagnosis of these diseases depends on the accuracy of the retinal vascular segmentation results.To address this challenge,we design a Dual-Branch-UNet framework,which comprises a Dual-Branch encoder structure for feature extraction based on the traditional U-Net model for medical image segmentation.To be more explicit,we utilize a novel parallel encoder made up of various convolutional modules to enhance the encoder portion of the original U-Net.Then,image features are combined at each layer to produce richer semantic data and the model’s capacity is adjusted to various input images.Meanwhile,in the lower sampling section,we give up pooling and conduct the lower sampling by convolution operation to control step size for information fusion.We also employ an attentionmodule in the decoder stage to filter the image noises so as to lessen the response of irrelevant features.Experiments are verified and compared on the DRIVE and ARIA datasets for retinal vessels segmentation.The proposed Dual-Branch-UNet has proved to be superior to other five typical state-of-the-art methods. | Muwei Jian Ronghua Wu Hongyu Chen Lanqi Fu Chengdong Yang | 2023 | Computer Modeling in Engineering & Sciences2023，，10： | 2 |
| 19 | Robust Formation Maneuvers Through Sliding Mode for Multi-agent Systems With Uncertainties显示文摘This paper develops a robust control method for formation maneuvers of a multi-agent system. The multi-agent system is leader-follower-based, where the graph theory is utilized to describe the information exchange among the agents. The control method is exercised via sliding mode methodology where each agent is subjected to uncertainties. The technique of nonlinear disturbance observer is adopted in order to overcome the adverse effects of the uncertainties. Assuming that the uncertainties have an unknown bound, the formation stability conditions are investigated according to a given communication topology. In the sense of Lyapunov, not only the formation maneuvers of the multi-agent system have guaranteed stability, but the desired formations of the agents are also realized. Compared with other two control approaches, i.e., the basic sliding mode approach and the fuzzy sliding mode approach, some numerical results are presented to illustrate the effectiveness, performance and validity of the robust control method for formation maneuvers in the presence of uncertainties. | Dianwei Qian Chengdong Li Suk Gyu Lee Chao Ma | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，1： | 2 |
| 20 | γ-Fe_2O_3 nanoparticle-facilitated bisphenol A degradation by white rot fungus显示文摘The effect of γ-Fe_2O_3 nanoparticles on bisphenol A(BPA)biodegradation by white rot fungus(Pleurotus ostreatus)was investigated.Interestingly,the addition of γ-Fe_2O_3 nanoparticles enhanced BPA degradation efficiency by as much as 32% after 3 d in the presence of an environmentally relevant concentration of H_2O_2.The γ-Fe_2O_3-induced BPA degradation enhancement was not due to a commonly assumed Fenton-like reaction catalyzed by γ-Fe_2O_3 or dissolved Fe^(3+) ions.However,γ-Fe_2O_3was bioreduced to Fe_3O_4,which was more efficient at catalyzing the Fenton reaction,producing a highly active hydroxyl radical.The bioreduction of γ-Fe_2O_3 was confirmed by X-ray powder diffraction analysis.This study elucidates the potential biotransformation of nanoparticles in the environment and broadens the application of iron oxide nanoparticles for improved pollutant control. | Mingzhu Li Chengdong Zhang | 2016 | Science Bulletin2016，61，6： | 2 |
您所在的机构暂未开通此部分的功能，请联系管理员