维普中文期刊产品整合服务
143篇 您的检索式:作者名="Yakun"
    题名 作者 年代 出处 被引量
1Evidence chain-based causality identification in herb-induced liver injury: exemplification of a well-known liver-restorative herb Polygonum multiflorum显示文摘草药的药最近在美国作为导致药的肝损害(DILI ) 的第二个很普通的原因被认出了。然而,识别一些植物的 DILI 诱发性的可靠方法例如 Heshouwu (蓼 multiflorum 的弄干的根) ,留下缺乏。在这研究,有肝机能障碍和 Heshouwu DILI 的 147 个报导文学的案例的 12 307 个住院病人的一个总数被屏蔽。一个一般算法仅仅显示了那 22.5%(9/40 ) 并且(45/147 ) 分别地, 30.6% 所有住院和文学案例报告表明 Heshouwu 的 DILI 诱发性的高概率。由对比,(19/20 )95% 生药学,植物化学,和 metabolomic 有希望地调查的所有情况测试展出高度可能的诱发性,包括不正确地以前被归因的一个病人和从由 pharmacognostic 证据的 Heshouwu 诱发性被排除的一个案例。污染也是的毒素(重金属,杀虫剂,和 mycotoxins ) 从 Heshouwu DILI 诱发性排除了。为 Heshouwu DILI 诊断地址安全的这些屏蔽方法的客观性担心考虑包含芪的草药的药和饮食的补充。Jiabo Wang Zhijie Ma Ming Niu Yun Zhu Qingsheng Liang Yanling Zhao Jingyuan Song Zhaofang Bai Yaming Zhang Ping Zhang Na Li Yakun Meng Qi Li Lushan Qin Guangju Teng Junling Cao Baosen Li Shilin Chen Yonggang Li Zhengsheng Zou Honghao Zhou Xiaohe Xiao 2015Frontiers of Medicine2015,9,4:47
2Screening for main components associated with the idiosyncratic hepatotoxicity of a tonic herb, Polygonum multiflorum显示文摘典型药用的植物的主要成分,蓼 multiflorum (用汉语的 Heshouwu ) ,那导致特质的肝损害仍然保持不清楚。我们的以前的工作证明了有 lipopolysaccharide (LPS ) 的无毒的剂量和 Heshouwu 的治疗学的剂量的 cotreatment 能在老鼠导致肝损害,而独唱治疗不能导致看得见的损害。在现在的工作,用成分大美人和敲门在里面策略,我们发现 Heshouwu 的乙醇醋酸盐(EA ) 摘录在对待 LPS 的老鼠显示了可比较的特质的 hepatotoxicity 到整个摘录。结果显示血浆丙氨酸 aminotransferase, aspartate aminotransferase,和肝 histologic 的重要举起变化,而另外的分开的部分没能导致肝损害。有另外的分开的部分的 EA 摘录的混合在对待 LPS 的老鼠导致了可比较的特质的 hepatotoxicity 到整个摘录。化学分析进一步揭示了那 2,3,5,4-tetrahydroxy trans-stilbene-2-O -- 配糖物(trans-SG ) 和它的 cis 异构体是在 EA 的二主要混合物摘录。而且,孤立的 cis- ,并且不它的 trans 异构体,显示的可比较的特质的 hepatotoxicity 到在对待 LPS 的老鼠的 EA 摘录。cis-SG 的更高的内容从与收集的将军相比与 Heshouwu 联系的实际的肝沉醉病人在 Heshouwu 白酒或准备被检测样品。另外,血浆 metabolomics 分析证明 cis-SG-disturbing 充实显著地不同于的小径在对待 LPS 的老鼠的 trans-SG。所有这些结果建议 cis-SG 仔细与 Heshouwu 的特质的 hepatotoxicity 被联系。认为 trans-SG 的 cis-trans 异构化被紫外光或日光调停,我们的调查结果为在药发现控制 photoisomerization 并且为 Heshouwu 和芪相关的药的临床的使用用作参考。Chunyu Li Ming Niu Zhaofang Bai Congen Zhang Yanling Zhao Ruiyu Li Can Tu Huifang Li Jing Jing Yakun Meng Zhijie Ma Wuwen Feng Jinfa Tang Yun Zhu Jinjie Li Xiaoya Shang Zhengsheng Zou Xiaohe Xiao Jiabo Wang 2017Frontiers of Medicine2017,11,2:41
3Immunological synergistic mechanisms of trans-/cis-stilbene glycosides in Heshouwu-related idiosyncratic liver injury显示文摘Heshouwu is a traditional non-toxic Chinese medicine commonly used in the clinical setting;however,clinical cases of Heshouwu-induced hepatotoxicity have been frequently reported^([1]).Pharmacoepidemiological studies have found that Heshouwu-induced liver injury occurs only in a small fraction of individuals taking the drug;these patients presented with the typ-Lanzhi He Ping Yin Yakun Meng Jinfa Tang Tingting He Ming Niu Yuming Guo Yun Zhu Jing Jing Chunyu Li Zhijie Ma Jiabo Wang Zhaofang Bai Xiaohe Xiao 2017Science Bulletin2017,62,11:29
4LARGE-EDDY SIMULATION OF TURBULENT FLOW CONSIDERING INFLOW WAKES IN A FRANCIS TURBINE BLADE PASSAGE显示文摘Turbulent flow in a 3-D blade passage of a Francis hydro turbine was simulated with the Large Eddy Simulation (LES) to investigate the spatial and temporal distributions of the turbulence when strongly distorted wakes in the inflow sweep over the passage. In a suitable consideration of the energy exchanging mechanism between the large and small scales in the complicated passage with a strong 3-D curvature,one-coefficient dynamic Sub-Grid-Scale (SGS) stress model was used in this article. The simulations show that the strong wakes in the inflow lead to a flow separation at the leading zone of the passage,and to form a primary vortex in the span-wise direction. The primary span-wise vortex evolves and splits into smaller vortex pairs due to the constraint of no-slip wall condition,which triggers losing stability of the flow in the passage. The computed pressures on the pressure and suction sides agree with the measured data for a working test turbine model.WANG Wen-quan ZHANG Li-xiang YAN Yan GUO Yakun 2007Journal of Hydrodynamics2007,19,2:12
5Toward Intelligent Machine Tool显示文摘With the development of modern information technology-and particularly of the new generation of artificial intelligence(AI)technology-new opportunities are available for the development of the intelligent machine tool(IMT).Based on the three classical paradigms of intelligent manufacturing as defined by the Chinese Academy of Engineering,the concept,characteristics,and systemic structure of the IMT are presented in this paper.Three stages of machine tool evolution-from the manually operated machine tool(MOMT)to the IMT-are discussed,including the numerical control machine tool(NCMT),the smart machine tool(SMT),and the IMT.Furthermore,the four intelligent control principles of the IMT-namely,autonomous sensing and connection,autonomous learning and modeling,autonomous optimization and decision-making,and autonomous control and execution-are presented in detail.This paper then points out that the essential characteristic of the IMT is to acquire and accumulate knowledge through learning,and presents original key enabling technologies,including the instruction-domain-based analytical approach,theoretical and big-data-based hybrid modeling technology,and the double-code control method.Based on this research,an intelligent numerical control(INC)system and industrial prototypes of IMTs are developed.Three intelligent practices are conducted,demonstrating that the integration of the new generation of AI technology with advanced manufacturing technology is a feasible and convenient way to advance machine tools toward the IMT.Jihong Chen Pengcheng Hu Huicheng Zhou Jianzhong Yang Jiejun Xie Yakun Jiang Zhiqiang Gao Chenglei Zhang 2019Engineering2019,5,4:12
6Of genes and microbes: solving the intricacies in host genomes显示文摘Microbiome 研究是在生物医学的研究的一个快速发展中的领域,并且我们在理解见证它的潜力生理学,新陈代谢和免疫学,它在理解主人的健康和疾病的关键角色,和它在疾病预言,干预和处理的广阔能力。然而,许多仍然基本问题需要被探讨,包括在个人之间并且越过时间的微生物引起的差异的塑造的力量。Microbiome 研究掉进古典性质对养育情形 microbiome 的主人遗传形状部分,当环境影响改变 microbiome 开发的原来的功课时。在这评论,我们集中于性质,即,基因方程分开,并且在染色体,特别人和鼠标染色体的部分的理解总结最近的努力,在决定微生物引起的社区的作文和函数起重要作用,首先在内脏而且在皮肤上。我们试图在学习在主人之间的复杂关系给出不同途径的概述基因变化和微生物,它的内在的哲学和方法论,并且我们试图沿着这探索,以及当前的陷井加亮一些关键发现。更多的证据和结果愿望肯定在即将来临的研究出现,并且积累的知识将导致我们能最后称为的更深的理解 hologenome,也就是说主人的组织、仔细交往的染色体和 microbiome。Jun Wang Liang Chen Na Zhao Xizhan Xu Yakun Xu Baoli Zhu 2018Protein & Cell2018,9,5:11
7The Limiting Effect of Deep Soil Water on Evapotranspiration of a Subtropical Coniferous Plantation Subjected to Seasonal Drought显示文摘Seasonal drought is a common occurrence in humid climates. The year 2003 was the driest year during the period 1985– 2011 in southeastern China. The objective of this study was to elucidate the impact of the exceptional drought in 2003, compared with eddy flux measurements during 2004–11, on the dynamics of evapotranspiration(ET) and related factors, as well as their underlying mechanisms, in a subtropical coniferous plantation in southeastern China. It was found that daily ET decreased from 5.34 to 1.84 mm during the intensive drought period and recovered to 4.80 mm during the subsquent recovering drought period. Path analysis indicated that ET was mainly determined by canopy conductance and deep soil water content(50 cm) during the intensive drought and recovering drought periods, respectively. The canopy conductance offset the positive effect of air vapor pressure deficit on ET when suffering drought stress, while the canopy conductance enhanced the positive effect of air temperature on ET during the late growing season. Because the fine roots of this plantation are mainly distributed in shallow soil, and the soil water in the upper 40 cm did not satisfy the demand for ET, stomatal closure and defoliation were evident as physiological responses to drought stress.TANG Yakun WEN Xuefa SUN Xiaomin ZHANG Xinyu WANG Huimin 2014Advances in Atmospheric Sciences2014,31,2:11
8Homeodomain leucine-zipper proteins and their role in synchronizing growth and development with the environment显示文摘The Arabidopsis(Arabidopsis thaliana L.) genome Minireviewencodes for four distinct classes of homeodomain leucine-zipper(HD-ZIP) transcription factors(HD-ZIPI to HD-ZIPIV),which are all organized in multi-gene families. HD-ZIP transcription factors act as sequence-specific DNA-binding proteins that are able to control the expression level of target genes. While HD-ZIPI and HD-ZIPII proteins are mainly associated with environmental responses, HD-ZIPIII and HD-ZIPIV are primarily known to act as patterning factors.Recent studies have challenged this view. It appears that several of the different HD-ZIP families interact genetically to align both morphogenesis and environmental responses, most likely by modulating phytohormone-signaling networks.Ronny Brt Marc Cabedo Yakun Xie Stephan Wenkel 2014Journal of Integrative Plant Biology2014,56,6:9
9DEVELOPMENT AND APPLICATION OF A EUTROPHICATION WATER QUALITY MODEL FOR RIVER NETWORKS显示文摘The Preissmann implicit scheme was used to discretize the one-dimensional Saint-Venant equations, the river-junction-river method was applied to resolve the hydrodynamic and water quality model for river networks, and the key issues on the model were expatiated particularly in this article. This water quality module was designed to compute time dependent concentrations of a series of constituents, which are primarily governed by the processes of advection, dispersion and chemical reactions. Based on the theory of Water Quality Analysis Simulation Program (WASP) water quality model, emphasis was given to the simulation of the biogeochemical transformations that determine the fate of nutrients, in particular, the simulation of the aquatic cycles of nitrogen and phosphorus compounds. This model also includes procedures for the determination of growth and death of phytoplankton. This hydrodynamic and water quality model was applied to calculate two river networks. As illustrated by the numerical examples, the calculated water level and discharge agree with the measured data and the simulated trends and magnitudes of water quality constituents are generally in good agreement with field observations. It is concluded that the presented model is useful in the pollutant control and in the determination of pollutant-related problems for river networks.ZHANG Ming-liang SHEN Yong-ming GUO Yakun 2008Journal of Hydrodynamics2008,20,6:8
10Multi-omics analyses of 398 foxtail millet accessions reveal genomic regions associated with domestication,metabolite traits,and antiinflammatory effects显示文摘Foxtail millet(Setaria italica),which was domesticatedfromthewild speciesgreenfoxtail(Setaria viridis),isa richsource of phytonutrientsfor humans.To evaluate how breeding changed themetabolome offoxtail millet grains,we generated and analyzed the datasets encompassing the genomes,transcriptomes,metabolomes,and anti-inflammatory indices from 398 foxtail millet accessions.We identified hundreds of common variants that influence numerous secondary metabolites.We observed tremendous differences in natural variations of the metabolites and their underlying genetic architectures between distinct sub-groups of foxtail millet.Furthermore,we found that the selection of the gene alleles associated with yellow grains led to altered profiles of metabolites such as carotenoids and endogenous phytohormones.Using CRiSPR-mediated genome editing wevalidated the function of PHYTOENE SYNTHASE1(PSY1)gene in affecting milletgrain colorand quality.Interestingly,our in vitro cell inflammation assays showed that 83 metabolites in millet grains have anti-inflammatory effects.Taken together,ourmulti-omics study illustrates how the breeding history of foxtail millet has shaped its metabolite profile.The datasets we generated in this study also provide important resources for further understanding how millet grain quality is affected by different metabolites,laying the foundations for future millet genetic research and metabolome-assisted improvement.Xukai Li Jianhua Gao Jingyi Song Kai Guo Siyu Hou Xingchun Wang Qiang He Yanyan Zhang Yakun Zhang Yulu Yang Jiaoyan Tang Hailang Wang Staffan Persson Mingquan Huang Lishuai Xu Linlin Zhong Dongqin Li Yongming Liu Hua Wu Xianmin Diao Peng Chen Xiaowen Wang Yuanhuai Han 2022Molecular Plant2022,15,8:8
11Folate receptor-mediated boron-10 containing carbon nanoparticles as potential delivery vehicles for boron neutron capture therapy of nonfunctional pituitary adenomas显示文摘Invasive nonfunctional pituitary adenomas(NFPAs) are difficult to completely resect and often develop tumor recurrence after initial surgery.Currently,no medications are clinically effective in the control of NFPA.Although radiation therapy and radiosurgery are useful to prevent tumor regrowth,they are frequently withheld because of severe complications.Boron neutron capture therapy(BNCT) is a binary radiotherapy that selectively and maximally damages tumor cells without harming the surrounding normal tissue.Folate receptor(FR)-targeted boron-10 containing carbon nanoparticles is a novel boron delivery agent that can be selectively taken up by FR-expressing cells via FR-mediated endocytosis.In this study,FR-targeted boron-10 containing carbon nanoparticles were selectively taken up by NFPAs cells expressing FR but not other types of non-FR expressing pituitary adenomas.After incubation with boron-10 containing carbon nanoparticles and following irradiation with thermal neutrons,the cell viability of NFPAs was significantly decreased,while apoptotic cells were simultaneously increased.However,cells administered the same dose of FR-targeted boron-10 containing carbon nanoparticles without neutron irradiation or received the same neutron irradiation alone did not show significant decrease in cell viability or increase in apoptotic cells.The expression of Bcl-2 was down-regulated and the expression of Bax was up-regulated in NFPAs after treatment with FR-mediated BNCT.In conclusion,FR-targeted boron-10 containing carbon nanoparticles may be an ideal delivery system of boron to NFPAs cells for BNCT.Furthermore,our study also provides a novel insight into therapeutic strategies for invasive NFPA refractory to conventional therapy,while exploring these new applications of BNCT for tumors,especially benign tumors.DAI CongXin CAI Feng HWANG Kuo Chu ZHOU YongMao ZHANG ZiZhu LIU XiaoHai MA SiHai YANG YaKun YAO Yong FENG Ming BAO XinJie LI GuiLin WEI JunJi JIAO YongHui WEI ZhenQing MA WenBin WANG RenZhi 2013Science China(Life Sciences)2013,56,2:8
12INTRINSIC FEATURES OF TURBULENT FLOW IN STRONGLY 3-D SKEW BLADE PASSAGE OF A FRANCIS TURBINE显示文摘The turbulent flow, with the Reynolds number of 5.9× 105, in the strongly 3-D skew blade passage of a true Francis hydro turbine was simulated by the Large Eddy Simulation (LES) approach to investigate the spatial and temporal distributions of the fully developed turbulence in the passage with strongly 3-D complex geometry. The simulations show that the strong three-dimensionality of the passage has a great amplification effect on the turbulence in the passage, and the distributions of the turbulence are diversely nonuniform, for instance, the rise of turbulent kinetic energy in the lower 1/3 region of the passage is more than 45%, whereas its rise in the upper 1/3 region is less than 1%. With the LES approach, the details of the flow structures at the near-wall surfaces of the blades could be obtained. Several turbulent spots were captured.ZHANG Li-xiang WANG Wen-quan GUO Yakun 2007Journal of Hydrodynamics2007,19,1:7
13Effects of drought stress on photosynthesis and chlorophyll fluorescence images of soybean(Glycine max)seedlings显示文摘The main purpose of this research is to provide a theoretical foundation for the screening of drought-resistant soybean varieties and to establish an efficient method to detect the PSII actual photochemical quantum yields efficiently.Three soybean varieties were compared in this experiment after 15 d when they were planted in a greenhouse.These varieties were then exposed to light drought stress(LD)and serious drought stress(SD)conditions.With five times’measurement,chlorophyll fluorescence and soil-plant analysis development considered as the main basis for this study.Several parameters in SD conditions significantly reduced,such as net photosynthetic rates(Pn),stomatal conductance(Gs),PSII primary light energy conversion efficiency(Fv/FM),PSII actual photochemical quantum yields[Y(II)],photochemical quenching coefficient(qP)and non-photochemical quenching coefficient(qN).The soybeans in the seedling stage adapted to the inhibitory effect of drought stress on photosynthesis through stomatal limitation.Under serious drought stress,non-stomatal limitation damaged the plant photosynthetic system.The amplitudes of Pn and Y(II)of drought-resistant Qihuang 35 were lower than those of the two other varieties.Based on the data of this study,a new method had been developed to detect Y(II)which reflected the photosynthetic capacity of plant,R=0.85989,u=0.048803 when using multiple linear regression,and R=0.84285,u=0.054739 when using partial least square regression.Wensen Wang Cheng Wang Dayu Pan Yakun Zhang Bin Luo Jianwei Ji 2018International Journal of Agricultural and Biological Engineering2018,11,2:7
14Sap flow characteristics and physiological adjustments of two dominant tree species in pure and mixed plantations in the semi-arid Loess Plateau of China显示文摘It is essential to understand the water consumption characteristics and physiological adjustments of tree species under drought conditions,as well as the effects of pure and mixed plantations on these characteristics in semi-arid regions.In this study,the normalized sap flow(SF_n),leaf water potential,stomatal conductance(g_s),and photosynthetic rate(P_r)were monitored for two dominant species,i.e.,Pinus tabuliformis and Hippophae rhamnoides,in both pure and mixed plantations in a semi-arid region of Chinese Loess Plateau.A threshold-delay model showed that the lower rainfall thresholds(R^L)for P.tabuliformis and H.rhamnoides in pure plantations were 9.6 and 11.0 mm,respectively,and the time lags(τ)after rainfall were 1.15 and 1.76 d for corresponding species,respectively.The results indicated that P.tabuliformis was more sensitive to rainfall pulse than H.rhamnoides.In addition,strong stomatal control allowed P.tabuliformis to experience low g_s and P_r in response to drought,while maintaining a high midday leaf water potential(Ψ_m).However,H.rhamnoides maintained high g_s and P_r at a lowΨ_m expense.Therefore,P.tabuliformis and H.rhamnoides can be considered as isohydric and anisohydric species,respectively.In mixed plantation,the values of R^L for P.tabuliformis and H.rhamnoides were 6.5 and 8.9 mm,respectively;and the values ofτwere 0.86 and 1.61 d for corresponding species,respectively,which implied that mixed afforestation enhanced the rainfall pulse sensitivity for both two species,especially for P.tabuliformis.In addition,mixed afforestation significantly reduced SF_n,g_s,and P_r for P.tabuliformis(P<0.05),while maintaining a high leaf water potential status.However,no significant effect of mixed afforestation of H.rhamnoides was observed at the expense of leaf water potential status in response to drought.Although inconsistent physiological responses were adopted by these species,the altered water consumption characteristics,especially for P.tabuliformis indicated that the mixed afforestation requires further investigation.TANG Yakun WU Xu CHEN Yunming 2018Journal of Arid Land2018,10,6:7
15Investigation of open channel flow with unsubmerged rigid vegetation by the lattice Boltzmann method显示文摘The aquatic vegetation can significantly affect the flow structure,the sediment transport,the bed scour and the water quality in rivers,lakes,reservoirs and open channels.In this study,the lattice Boltzmann method(LBM)is applied in the two-dimensional numerical simulation of the flow structure in a flume with rigid vegetation.A multi-relaxation time model is applied to improve the stability of the numerical scheme for flows with a high Reynolds number.The vegetation induced drag force is added in the lattice Boltzmann equation model in order to improve the simulation accuracy and an algorithm of the multi-relaxation time is developed.Numerical simulations are performed for a wide range of flow and vegetation conditions and are validated by comparing with the laboratory experiments.Analysis of the simulated and experimentally measured flow Helds shows that the numerical simulation can satisfactorily reproduce the laboratory experiments,indicating that the proposed lattice Boltzmann model enjoys a high accuracy for simulating the flow-vegetation interaction in open channels.He-fang Jing Yin-juan Cai Wei-hong Wang Yakun Guo Chun-guang Li Yu-chuan Bai 2020Journal of Hydrodynamics2020,32,4:5
16STUDY ON TURBULENCE FEATURES NEAR AN OSCILLATING CURVED WALL显示文摘In pursuit of possibly true turbulent characters and for exploring a change in turbulence structures near an oscillating flexible wall-curved surface, a sinusoidal oscillation mode was forced to a curved wall, whose vibrations disturbed the flow with an interacting effort between the fluid and the structure. The methodology used was the Large Eddy Simulation (LES) with fluid-structure interaction. The oscillating configuration was on a Fourier sinusoidal mode from the measurements of a Francis hydro turbine blade vibration. The effects of the vibration on the skin friction coefficient, vortices, turbulent coherent structures, and other statistical quantities were studied. The results showed that the streamwise velocity gradient along the normal direction and the normal velocity gradient along the spanwise direction were considerably increased within the viscous sublayer because of the oscillating wall, which additionally caused the low speed streaks to stay away from the wall and the high-momentum flows to be toward the wall. As a result, the streamwise vortices were much more elongated along the downstream to get an energy balance, and the wall skin friction coefficient or the wall friction velocity rose up.WANG Wen-quan ZHANG Li-xiang YAN Yan GUO Yakun 2007Journal of Hydrodynamics2007,19,3:4
17Study on the FEM design of reinforced earth retaining wall with geogrid显示文摘At present,limit equilibrium method is often adopted in the design of reinforced earth retaining wall. Geotechnical engineers home and abroad have done a lot of work to improve the traditional calculation methods in recent years,while there are lots of defects. This paper first identifies the location of failure surface and safety factor through the finite element program of PLAXIS and then analyses the influencing factors of the stability of reinforced earth retaining wall with geogrid. The authors adopt strength reduction FEM (finite element method)in the design and stability analysis of reinforced earth retaining wall and have achieved some satisfying results. Without any assumptions,the new design method can automatically judge the failure mode of reinforced earth retaining wall,consider the influence of axial tensile stiffness of the reinforcement stripe on the stability of retaining wall,identify reasonable distance and length of the reinforcement stripe,and choose suitable parameters of reinforcement stripe,including strength,stiffness and pseudo-friction coefficient which makes the design optimal. It is proved through the calculation examples that this method is more reasonable,reliable and economical in the design of reinforced earth retaining wall.Song Yakun Zheng Yingren Tang Xiaosong Zhang Yufang 2010Engineering Sciences2010,8,3:4
18Mammography combined with breast dynamic contrast-enhanced-magnetic resonance imaging for the diagnosis of early breast cancer显示文摘Objective The aim of this study was to investigate the application of mammography combined with breast dynamic contrast-enhanced magnetic resonance imaging(DCE-MRI) for the diagnosis of early breast cancer. Methods Mammography and DCE-MRI were performed for 120 patients with breast cancer(malignant, 102; benign; 18). Results The sensitivity of mammography for early diagnosis of breast cancer was 66.67%, specificity was 77.78%, and accuracy was 68.33%. The sensitivity of MRI for early diagnosis of breast cancer was 94.12%, specificity was 88.89%, and accuracy was 93.33%. However, the sensitivity of mammography combined with DCE-MRI volume imaging with enhanced water signal(VIEWS) scanning for early diagnosis of breast cancer was 97.06%, specificity was 94.44%, and accuracy was 96.67%. Conclusion Mammography combined with DCE-MRI increased the sensitivity, specificity, and accuracy of diagnosing early breast cancer.Yakun He Guohui Xu Jin Ren Bin Feng Xiaolei Dong Hao Lu Changjiu He 2016Oncology and Translational Medicine2016,2,4:4
19Microwave-hydrothermal preparation of a graphene/hierarchy structure MnO_2 composite for a supercapacitor显示文摘Graphene/hierarchy structure manganese dioxide(GN/MnO_2) composites were synthesized using a simple microwave-hydrothermal method.The properties of the prepared composites were analyzed using field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),transmission electron microscopy(TEM),and X-ray photoelectron spectroscopy(XPS) measurements.The electrochemical performances of the composites were analyzed using cyclic voltammetry,electrochemical impedance spectrometry(EIS),and chronopotentiometry.The results showed that GN/MnO_2(10wt% graphene) displayed a specific capacitance of 244F/gat a current density of 100mA/g.An excellent cyclic stability was obtained with a capacity retention of approximately 94.3% after 500 cycles in a 1 mol/L Li_2SO_4 solution.The improved electrochemical performance is attributed to the hierarchy structure of the manganese dioxide,which can enlarge the interface between the active materials and the electrolyte.The preparation route provides a new approach for hierarchy structure graphene composites;this work could be readily extended to the preparation of other graphene-based composites with different structures for use in energy storage devices.Zhong Chen Jianling Li Yu Chen Yakun Zhang Guofeng Xu Jun Yang Ye Feng 2014Particuology2014,12,4:4
20Effects of cerium substitution on phase components, microstructures and magnetic properties of Nd-Fe-Ti-B alloy显示文摘(Nd(1-x)Cex)(12)Fe(77)Ti5B6(x=0,0.2,0.3,0.4,0.6,0.8)alloys were prepared by melt-spinning and annealing techniques.The phase constitutions,microstructures and magnetic properties were investigated by powder X-ray diffraction(XRD),a differential scanning calorimeter(DSC),a vibrating sample magnetometer(VSM)and a transmission electron microscope(TEM).It is found that with the increase of Ce content,the coercivity of the(Nd(1-x)Cex)(12)Fe(77)Ti5B6 alloys reaches maximum first and then decreases.The maximum coercivity reaches 18.5 kOe obtained in the sample of 20%Ce substituted which is 34%higher than the Ce-free sample.TEM results reveal that the micro structure refinement effect is responsible for the coercivity improvement.This phenomenon implies that in some cases,Ce and Ti co-doping is more beneficial to improving of the coercivity than Ti single doping in Nd-Fe-B alloys.With further Ce addition,magnetic properties deteriorate due to the formation of CeFe2 and TbCu7-type phases.Haijun Peng Yang Luo Yakun Dou Xinyuan Bai Wenlong Yan Dunbo Yu Yuanfei Yang Shulin Diao 2019Journal of Rare Earths2019,37,8:4
返回顶部 每页显示:
共8页 首页 上一页 第1页 下一页 末页 /8 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费