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132篇 您的检索式:作者名="Hongbo Wei"
    题名 作者 年代 出处 被引量
1The Chrysanthemum nankingense Genome Provides Insights into the Evolution and Diversification of Chrysanthemum Flowers and Medicinal Traits显示文摘The Asteraceae (Compositae),a large plant family of approximately 24 000-35 000 species,accounts for^10% of all angiosperm species and contributes a lot to plant diversity.The most representative members of the Asteraceae are the economically important chrysanthemums (Chrysanthemum L.)that diversified through reticulate evolution.Biodiversity is typically created by multiple evolutionary mechanisms such as wholegenome duplication 0NGD)or polyploidization and locally repetitive genome expansion.However,the lack of genomic data from chrysanthemum species has prevented an in-depth analysis of the evolutionary mechanisms involved in their diversification.Here,we used Oxford Nanopore long-read technologyto sequence the diploid Chrysanthemum nankingense genome,which represents one of the progenitor genomes of domesticated chrysanthemums.Our analysis revealed that the evolution of the C.nankingense genome was driven by bursts of repetitive element expansion and WGD events including a recentWGD that distinguishes chrysanthemum from sunflower,which diverged from chrysanthemum approximately 38.8 million years ago.Variations of ornamental and medicinal traits in chrysanthemums are linked to the expansion of candidate gene families by duplication events including paralogous gene duplication.Collectively,our study of the assembled reference genome offers new knowledge and resources to dissect the history and pattern of evolution and diversification of chrysanthemum plants,and also to accelerate their breeding and improvement.Chi Song Yifei Liu Aiping Song Gangqiang Dong Hongbo Zhao Wei Sun Shyam Ramakrishnan Ying Wang Shuaibin Wang Tingzhao Li Yan Niu Jiafu Jiang Bin Dong Ye Xia Sumei Chen Zhigang Hu Fadi Chen Shilin Chen 2018Molecular Plant2018,11,12:24
2Nitrogen removal and simultaneous nitrification and denitrification in a fluidized bed step-feed process显示文摘For urban wastewater treatment,we conducted a novel four-stage step-feed wastewater treatment system combined with a fluidized bed laboratory experiment to investigate chemical oxygen demand(COD),NH4+-N,and total nitrogen(TN) removal performance.The removal rates of COD,NH4+-N and TN were 88.2%,95.7%,and 86.4% with e?uent concentrations of COD,NH4+-N and TN less than 50,8,and 10 mg/L,respectively.Biomass and bacterial activities were also measured,with results showing more nitrobacteria in the activated sludge than in the biofilm;however,bacterial activity of the biofilm biomass and the activated sludge were similar.Nitrogen concentrations during the process were also detected,with simultaneous nitrification and denitrification found to be obvious.BingWang Wei Wang Hongjun Han Hongbo Hu Haifeng Zhuang 2012Journal of Environmental Sciences2012,24,2:22
3High-speed femtosecond laser plasmonic lithography and reduction of graphene oxide for anisotropic photoresponse显示文摘Micro/nanoprocessing of graphene surfaces has attracted significant interest for both science and applications due to its effective modulation of material properties,which,however,is usually restricted by the disadvantages of the current fabrication methods.Here,by exploiting cylindrical focusing of a femtosecond laser on graphene oxide(GO)films,we successfully produce uniform subwavelength grating structures at high speed along with a simultaneous in situ photoreduction process.Strikingly,the well-defined structures feature orientations parallel to the laser polarization and significant robustness against distinct perturbations.The proposed model and simulations reveal that the structure formation is based on the transverse electric(TE)surface plasmons triggered by the gradient reduction of the GO film from its surface to the interior,which eventually results in interference intensity fringes and spatially periodic interactions.Further experiments prove that such a regular structured surface can cause enhanced optical absorption(>20%)and an anisotropic photoresponse(~0.46 ratio)for the reduced GO film.Our work not only provides new insights into understanding the laser-GO interaction but also lays a solid foundation for practical usage of femtosecond laser plasmonic lithography,with the prospect of expansion to other two-dimensional materials for novel device applications.Tingting Zou Bo Zhao Wei Xin Ye Wang Bin Wang Xin Zheng Hongbo Xie Zhiyu Zhang Jianjun Yang Chunlei Guo 2020Light(Science & Applications)2020,9,1:17
4Overview of 5G security technology显示文摘The 5 th-generation mobile communication system(5 G) has higher security requirements than previous systems. Accordingly, international standard organizations, operators, and equipment manufacturers are focusing extensively on 5 G security technology. This paper analyzes the security requirements of 5 G business applications, network architecture, the air interface, and user privacy. The development trends of5 G security architecture are summarized, with a focus on endogenous defense architecture, which represents a new trend in 5 G security development. Several incremental 5 G security technologies are reviewed, including physical layer security, lightweight encryption, network slice security, user privacy protection, and block chain technology applied to 5 G.Xinsheng JI Kaizhi HUANG Liang JIN Hongbo TANG Caixia LIU Zhou ZHONG Wei YOU Xiaoming XU Hua ZHAO Jiangxing WU Ming YI 2018Science China(Information Sciences)2018,61,8:14
5Characteristics of the lunar samples returned by the Chang'E-5 mission显示文摘Forty-five years after the Apollo and Luna missions returned lunar samples,China's Chang’E-5(CE-5)mission collected new samples from the mid-latitude region in the northeastern Oceanus Procellarum of the Moon.Our study shows that 95%of CE-5 lunar soil sizes are found to be within the range of 1.40-9.35μm,while 95%of the soils by mass are within the size range of 4.84-432.27μm.The bulk density,true density and specific surface area of CE-5 soils are 1.2387 g/cm^(3),3.1952 g/cm^(3) and 0.56 m^(2)/g,respectively.Fragments from the CE-5 regolith are classified into igneous clasts(mostly basalt),agglutinate and glass.A few breccias were also found.The minerals and compositions of CE-5 soils are consistent with mare basalts and can be classified as low-Ti/low-Al/low-K type with lower rare-earth-element contents than materials rich in potassium,rare earth element and phosphorus.CE-5 soils have high FeO and low Mg index,which could represent a new class of basalt.Chunlai Li Hao Hu Meng-Fei Yang Zhao-Yu Pei Qin Zhou Xin Ren Bin Liu Dawei Liu Xingguo Zeng Guangliang Zhang Hongbo Zhang Jianjun Liu Qiong Wang Xiangjin Deng Caijin Xiao Yonggang Yao Dingshuai Xue Wei Zuo Yan Su Weibin Wen Ziyuan Ouyang 2022National Science Review2022,9,2:12
6Chang'E-1 Lunar Mission:An Overview and Primary Science Results显示文摘Chang'E-1 is the first lunar mission in China,which was successfully launched on Oct.24th,2007.It was guided to crash on the Moon on March 1,2009,at 52.36°E,1.50°S,in the north of Mare Fecunditatis.The total mission lasted 495 days,exceeding the designed life-span about four months.1.37Terabytes raw data was received from Chang'E-1.It was then processed into 4Terabytes science data at different levels.A series of science results have been achieved by analyzing and applicating these data,especially 'global image of the Moon of China's first lunar exploration mission'.Four scientific goals of Chang'E-1 have been achieved.It provides abundant materials for the research of lunar sciences and cosmochemistry.Meanwhile these results will serve for China's future lunar missions.Ouyang Ziyuan Li Chunlai Lu Chang Liu Jianzhong Zou Yongliao Zhang Hongbo Jianjun Zuo Wei Su Yah Wen Weibin Bian Wei Zhao Baochang Wang Jianyu Yang Jianfeng Chang Jin Wang Huanyu Zhang Xiaohui Wang Shijin Wang Min Ren Xin Mu Lingli Kong Deqing Wang Xiaoqian Wang Fang Geng Liang Zhang Zhoubin Zheng Lei Zhu Xinying Zheng Yongchun Li Junduo Zou Xiaoduan Xu Chun Shi Shuobiao Gao Yifei Gao Guannan 2010空间科学学报2010,30,5:11
7Identification of the surgical indication line for the Denonvilliers’fascia and its anatomy in patients with rectal cancer显示文摘Background:The high rate of urogenital dysfunction after traditional total mesorectal excision(TME)has caused doubts among scholars on the standard fashion of dissection.We have proposed the necessity to preserve the Denonvilliers’fascia in patients with rectal cancer.However,how to accurately locate the Denonvilliers’fascia is unclear.This study aimed to explore anatomical features of the Denonvilliers’fascia by comparing autopsy findings and observations of surgical videos so as to propose a dissection method for the preservation of pelvic autonomic nerves during rectal cancer surgery.Methods:Five adult male cadaver specimens were dissected,and surgical videos of 135 patients who underwent TME for mid-low rectal cancer between January 2009 and February 2019 were reviewed to identify and compare the structure of the Denonvilliers’fascia.Results:The monolayer structure of the Denonvilliers’fascia was observed in 5 male cadaver specimens,and it was located between the rectum,the bottom of the bladder,the seminal vesicles,the vas deferens,and the prostate.The Denonvilliers’fascia was originated from the rectovesical pouch(or rectum-uterus pouch),down to fuse caudally with the rectourethral muscle at the apex of the prostate,and fused to the lateral ligaments on both sides.The fascia was thinner on the midline with a thickness of 1.06±0.10 mm.The crown shape of the Denonvilliers’fascia was slightly triangular,with a height of approximately 5.42±0.16 cm at midline.Nerves were more densely distributed in front of the Denonvilliers’fascia than behind,especially on both sides of it.Under laparoscopic view,the Denonvilliers’fascia was originated at the lowest point of the rectovesical pouch(or rectum-uterus pouch),with a thickened white line which was a good mark for identifying the Denonvilliers’fascia.Conclusion:Identification of the surgical indication line for the Denonvilliers’fascia could help us identify the Denonvilliers’fascia,and it would improve our ability to protect the pelvic autonomic function of patients undergoing TME for rectal cancer.Jianglong Huang Jing Liu Jiafeng Fang Zongheng Zeng Bo Wei Tufeng Chen Hongbo Wei 2020Cancer Communications2020,40,1:10
8KIF2C:a novel link between Wnt/β-catenin and mTORCI signaling in the pathogenesis of hepatocellular carcinoma显示文摘Hepatocellular carcinoma(HCC)is the most common primary liver malignancy and is the fourth-leading cause of cancer-related deaths worldwide.HCC is refractory to many standard cancer treatments and the prognosis is often poor,highlighting a pressing need to identify biomarkers of aggressiveness and potential targets for future treatments.Kinesin family member 2C(KIF2C)is reported to be highly expressed in several human tumors.Nevertheless,the molecular mechanisms underlying the role of KIF2C in tumor development and progression have not been investigated.In this study,we found that KIF2C expression was significantly upregulated in HCC,and that KIF2C up-regulation was associated with a poor prognosis.Utilizing both gain and loss of function assays,we showed that KIF2C promoted HCC cell proliferation,migration,invasion,and metastasis both in vitro and in vivo.Mechanistically,we identified TBC1D7 as a binding partner of KIF2C,and this interaction disrupts the formation of the TSC complex,resulting in the enhancement of mammalian target of rapamycin complexl(mTORCI)signal transduction.Additionally,we found that KIF2C is a direct target of the Wnt/β-catenin pathway,and acts as a key factor in mediating the crosstalk between Wnt/β-catenin and mTORCI signaling.Thus,the results of our study establish a link between Wnt/β-catenin and mTORCI signaling,which highlights the potential of KIF2C as a therapeutic target for the treatment of HCC.Shi Wei Miaomiao Dai Chi Zhang Kai Teng Fengwei Wang Hongbo Li Weipeng Sun Zihao Feng Tiebang Kang Xinyuan Guan Ruihua Xu Muyan Cai Dan Xie 2021Protein & Cell2021,12,10:8
9Detection of a half-microgal coseismic gravity change after the Ms7. 0 Lushan earthquake显示文摘Because only a small near-field coseismic gravity change signal remains after removal of noise from the accuracy of observations and the time and spatial resolution of the earth's surface gravity observation system,it is difficult to verify simulations of dislocation theory.In this study,it is shown that the GS15 gravimeter,located 99.5 km from the epicenter of the Ms7.0 Lushan earthquake on April 20,2013 at 08∶04 UTC+8,showed the influence of the earthquake from 2013-04-16 to 2013-04-26 after a time calibration,tide corrections,drift correction,period correction and relaxation correction were applied to its data.The post-seismic relaxation process of the spring in the gravimeter took approximately 430 minutes and showed a 2.5×10-8ms-2gravity change.After correcting for the relaxation process,it is shown that a coseismic gravity change of approximately+0.59±0.4×10-8ms-2was observed by the GS15 gravimeter;this agrees with the simulated gravity change of approximately 0.31×10-8ms-2.The rate of the coseismic gravity change and the coseismic vertical displacement,as measured by one-second and one-day sampling interval GPS units,is also consistent with the theoretical rate of change.Therefore,the GS15 gravimeter at the Pixian Station observed a coseismic gravity change after the Ms7.0 Lushan earthquake.This and similar measurements could be applied to test and confirm the theory used for these simulations.Wei Jin Zhao Bin Tan Hongbo Yu Dan Shen Chongyang Li Hui 2013Geodesy and Geodynamics2013,4,3:7
10Influence of the intensity and loading time of direct current electric field on the directional migration of rat bone marrow mesenchymal stem cells显示文摘Exogenic 电场能有效地加速骨头愈合并且向受伤区域通过骨头髓的提高的迁居改变间充质的干细胞(BMSC ) 。这研究试图决定下列:(1 ) 在到一个直接当前的电场(DCEF ) 的暴露之上的老鼠 BMSC (rBMSC ) 移植的方向,(2 ) 最佳的 DCEF 紧张和持续时间,并且(3 ) 在由 DCEF 导致了的 rBMSC 移植的 SDF-1/CXCR4 轴的可能的规章的角色。显示出的结果 rBMSCs 移居了到 DCEF 的积极电极,并且为 4 h 的 200 mV/mm 的 DCEF 被发现在提高 rBMSC 移植最佳。这 DCEF 力量和持续时间另外 upregulated osteoblastic 基因,包括的高山和 OCN 的表示,和 upregulated 高山和 Runx2 蛋白质的表示。而且当 CXCR4 被禁止时, rBMSC 移植部分由于 DCEF 被堵住。这些调查结果显示 DCEF 能有效地导致 rBMSC 移植。因为它支持 rBMSC 移植,增长,和 osteogenic 区别的能力,为 4 h 的 200 mV/mm 的 DCEF 被推荐。表明小径的 SDF-1/CXCR4 可以在调整 rBMSCs 的导致 DCEF 的迁居起一个重要作用。Xiaoyu Wang Yuxuan Gao Haigang Shi Na Liu Wei Zhang Hongbo Li 2016Frontiers of Medicine2016,10,3:7
11Application of Improved Multi-Objective Ant Colony Optimization Algorithm in Ship Weather Routing显示文摘This paper presents a novel intelligent and effective method based on an improved ant colony optimization(ACO)algorithm to solve the multi-objective ship weather routing optimization problem,considering the navigation safety,fuel consumption,and sailing time.Here the improvement of the ACO algorithm is mainly reflected in two aspects.First,to make the classical ACO algorithm more suitable for long-distance ship weather routing and plan a smoother route,the basic parameters of the algorithm are improved,and new control factors are introduced.Second,to improve the situation of too few Pareto non-dominated solutions generated by the algorithm for solving multi-objective problems,the related operations of crossover,recombination,and mutation in the genetic algorithm are introduced in the improved ACO algorithm.The final simulation results prove the effectiveness of the improved algorithm in solving multi-objective weather routing optimization problems.In addition,the black-box model method was used to study the ship fuel consumption during a voyage;the model was constructed based on an artificial neural network.The parameters of the neural network model were refined repeatedly through the historical navigation data of the test ship,and then the trained black-box model was used to predict the future fuel consumption of the test ship.Compared with other fuel consumption calculation methods,the black-box model method showed higher accuracy and applicability.ZHANG Guangyu WANG Hongbo ZHAO Wei GUAN Zhiying LI Pengfei 2021Journal of Ocean University of China2021,20,1:7
12A novel RHT-TBD approach for weak targets in HPRF radar显示文摘A novel approach, which can handle ambiguous data from weak targets, is proposed within the randomized Hough transform track-before-detect(RHT-TBD) framework. The main idea is that, without the pre-detection and ambiguity resolution step at each time step, the ambiguous measurements are mapped by the multiple hypothesis ranging(MHR) procedure. In this way, all the information, based on the relativity in time and pulse repetition frequency(PRF) domains, can be gathered among different PRFs and integrated over time via a batch procedure. The final step is to perform the RHT with all the extended measurements, and the ambiguous data is unfolded while the detection decision is confirmed at the end of the processing chain.Unlike classic methods, the new approach resolves the problem of range ambiguity and detects the true track for targets. Finally, its application is illustrated to analyze and compare the performance between the proposed approach and the existing approach. Simulation results exhibit the effectiveness of this approach.Hongbo YU Guohong WANG Wei WU Shuncheng TAN 2016Science China Earth Sciences2016,59,12:6
13Data Analysis of Chang'E-1 Gamma-Ray Spectrometer and Global Distribution of U,K,and Th Elemental Abundances显示文摘Gamma 光线分光计(GRS ) 是 Chang'E-1 (CE-1 ) 上的主要收费载重之一月亮的探查,主要试图在月亮的表面上检测元素的丰富和分布。在 03:58 在 2007 年 11 月 28 日,它执行了月亮的 gamma 光线的第一观察。2008 年 10 月 24 日,有效 gamma 光线系列的 2105 h 被 CE-1 GRS 获得了,它盖住月亮的整个表面。这份报纸主要描述处理由使用导出元素的丰富的过程和 CE-1 GRS 时间系列改正了系列的方法的数据:首先,到进为印射的象素的箱数据;然后,执行累积系列的背景扣除并且获得元素的一个山峰区域;并且最后,当模特儿使用元素的丰富倒置生产元素的丰富。在这些上基于比 EPR 在 5s 处理方法, U 的全球丰富地图, K,和 Th。在在 near-EPR 海底山下面的岩浆结晶化压力和融化的条件之间的关联暗示来源吗?ZOU Yongliao ZHANG Liyan LIU Jianzhong MU Lingli REN Xin ZHANG Guangliang CHANG Jin YAN Jun ZHANG Nan ZHANG Hongbo LU Chang LIU Jianjun ZUO Wei SU Yan WEN Weibin BIAN Wei WANG Min XU Chun LI Chunlai OUYANG Ziyuan 2011Acta Geologica Sinica(English Edition)2011,85,6:6
14Polymer assisted deposition of high-quality CsPbI2Br film with enhanced film thickness and stability显示文摘Inorganic halide perovskites such as cesium lead iodide(CsPbI3)have drawn tremendous attention,as their tunable band gaps are desirable for solar cells as well as light emitting diodes.However,due to their low Goldschmidt tolerance factor,the cubic phase of bulk CsPbX3-the variant with desirable band gap-is not stable in ambient,especially in humid air.Besides,the low solubility of CsX in precursor makes it difficult to control the film thickness and morphology of CsPbX3,which becomes another obstacle for the practical application of inorganic perovskite.Here,we report a polymer assisted deposition of high-quality CsPbI2Br film by spin-coating a polymer-blended CsPbI2Br precursor.The long-chained polymer increases the viscosity of the solution,which enables us to achieve a ca.700-nm thick film with a low solution concentration of CsPbI2Br.Moreover,the polymer network helps to regulate the crystallization process and provides more crystallization sites for perovskite film,reducing grain size and thus improving the film coverage.Perovskite solar cells with the polymer network exhibit improved efficiency and reproducibility(0.72%standard deviation).Moreover,the device demonstrates excellent robustness against moisture and oxygen,and maintains 90%of its initial power conversion efficiency(PCEs)after aging 4 months in ambient conditions.The conception of polymer incorporation into inorganic perovskite films paves a way to further increase the performance,stability and reproducibility of inorganic perovskite devices.Jing Wei Xi Wang Xiangyu Sun Zhaofeng Yang Iwan Moreels Kun Xu Hongbo Li 2020Nano Research2020,13,3:6
15Investigation of the influence of intermediate principal stress on the dynamic responses of rocks subjected to true triaxial stress state显示文摘Precisely understanding the dynamic mechanical properties and failure modes of rocks subjected to true triaxial stress state(σ1>σ2>σ3,whereσ1,σ2,andσ3 are the major principal stress,intermediate principal stress,and minor principal stress,respectively)is essential to the safety of underground engineering.However,in the laboratory,it is difficult to maintain the constant true triaxial stress state of rocks during the dynamic testing process.Herein,a numerical servo triaxial Hopkinson bar(NSTHB)was developed to study the dynamic responses of rocks confronted with a true triaxial stress state,in which lateral stresses can maintain constant.The results indicate that the dynamic strength and elastic modulus of rocks increase with the rise of intermediate principal stressσ2,while the dynamic elastic modulus is independent of the dynamic strain rate.Simulated acoustic emission distributions indicate that the intermediate principal stressσ2 dramatically affects dynamic failure modes of triaxial confined rocks.Asσ2 increases,the failure pattern switches from a single diagonal shear zone into two parallel shear zones with a small slant.Moreover,a recent triaxial Hopkinson bar experimental system using three bar pairs is also numerically established,and the measuring discrepancies are identified between the two numerical bar systems.The proposed NSTHB system provides a controllable tool for studying the dynamic triaxial behavior of rocks.Wei You Feng Dai Yi Liu Hongbo Du Ruochen Jiang 2021International Journal of Mining Science and Technology2021,31,5:6
16Fractions and Bioavailability of Soil Inorganic Phosphorus in the Loess Plateau of China under Different Vegetations显示文摘植物在土壤磷营养起一个重要作用。然而,在中国的黄土高原的土壤的磷营养上的植物的效果很好没被理解。这研究被进行在中国的黄土高原揭示在植物和 phosphoru 的部分和可获得性之间的关系。22 个植物社区被调查,在不同植物华盖下面的土壤样品为土壤性质和无机的磷分别的决心是镇定的。结果证明 Leguminosae 和 Lilaceae 减少了 pH 并且当 Labiatae 和 Rosaceae 增加了 pH 并且减少时,在他们的华盖下面在土壤增加了有机物,阳离子交换能力,总数和 Olsen 磷在在他们的华盖下面的土壤的有机物,阳离子交换能力,总数和 Olsen 磷。Ca2P, Ca8P,高山和 Fe-P 的内容高度与土壤 Olsen 磷被联系。他们都在在 Leguminosae 和 Lilaceae 下面的土壤是更高级的并且在 Labiatae 和 Rosaceae 下面在土壤降低。这研究的结果显示 Leguminosae 和 Lilaceae 在土壤改进了磷营养,然而, Labiatae 和 Rosaceae 在他们的华盖下面在土壤阻碍了磷营养的改进,它将具有更多的帮助在这个区域指示植被恢复并且为土壤开发提供信息。WEI Xiaorong SHAO Mingan SHAO Hongbo GAO Jianlun XU Gang 2011Acta Geologica Sinica(English Edition)2011,85,1:6
17Microbial community structure and diversity in deep-sea hydrothermal vent sediments along the Eastern Lau Spreading Centre显示文摘The aim of this study is to investigate microbial structures and diversities in five active hydrothermal fields' sediments along the Eastern Lau Spreading Centre (ELSC) in the Lau Basin (southwest Pacific). Microbial communities were surveyed by denatured gradient gel electrophoresis (DGGE) and clone library analysis of 16S rRNA genes. The differences in microbial community structures among sediment samples from the five deep-sea hydrothermal sites were revealed by DGGE profiles. Cluster analysis of DGGE profiles separated the five hydrothermal samples into two groups. Four different 16S rRNA gene clone libraries, representing two selected hydrothermal samples (19-4TVG8 and 19-4TVG11), were constructed. Twenty-three and 32 phylotypes were identified from 166 and 160 bacterial clones respectively, including Proteobacteria, Bacteroidetes, Firmicutes, Nitrospirae and Planctomycetes. The phylum Proteobacteria is dominant in both bacterial libraries with a predominance of Gamma-Proteobacteria. A total of 31 and 25 phylotypes were obtained from 160 and 130 archaeal clones respectively, including Miscellaneous Crenarchaeotic Group, Marine Group Ⅰ and Ⅲ, Marine Benthic Group E, Terrestrial Hot Spring Crenarchaeota and Deep-sea Hydrothermal Vent Euryarchaeota. These results show a variety of clones related to those involved in sulfur cycling, suggesting that the cycling and utilization of sulfur compounds may extensively occur in the Lau Basin deep-sea hydrothermal ecosystem.WEI Manman ZHANG Rubing WANG Yuguang JI Houguo ZHENG Jia CHEN Xinhua ZHOU Hongbo 2013Acta Oceanologica Sinica2013,32,2:6
18Experimental study on broadband bistable energy harvester with L-shaped piezoelectric cantilever beam显示文摘This paper presents an experimental study of the broadband energy harvesting and dynamic responses of an L-shaped piezoelectric cantilever beam.Experimental results show that the L-shaped piezoelectric beam generates two optimal voltage peaks when the horizontal beam size is similar to the vertical beam size.Several optimized L-shaped piezoelectric cantilever beam structures are proposed.Power generation using the inverted bistable L-shaped beam is better.It is observed experimentally that the inverted bistable L-shaped beam structure shows obvious bistable characteristics and hard spring characteristics.Furthermore,the corresponding relationship between the bistable phase portrait and the potential energy curve is found in the experiment.This is the first time that a phase portrait for stiffness hardening of an L-shaped beam has been found experimentally.These results can be applied to analysis of new piezoelectric power generation structures.Minghui Yao Pengfei Liu Li Ma Hongbo Wang Wei Zhang 2020Acta Mechanica Sinica2020,36,3:5
19Sr-Nd isotope stratification along water depth:An example from Datong hydrological station of Yangtze River显示文摘This study examines the effects of hydrologic sorting and mixing of sources on the Sr-Nd isotopic compositions of suspended sediments at different water depths. The samples were collected from three layers (surface, middle and bottom) at Datong hydrological station of Yangtze River during the flood season of 2010. Our results show that, 87 Sr/ 86 Sr values decrease from surface to bottom, ranging from 0.730332 to 0.720857. ε Nd (0) values range from 14.75 to 10.09, with surface sediments being the most negative. The isotope composition at the middle layer can best represent the mean isotopic composition of the total suspended sediments transported by a river. It is believed that the stratification of Sr-Nd isotope is attributable to mixing of sediments from different sources due to hydrological sorting. Sediments from the upper stream are found to be coarser, and tend to contribute more to the lower water column. Although Sr-Nd isotope is a well acknowledged tool to trace sediment provenance, the current study suggests that the grain size of the samples and the sampling locations should be taken into consideration when applying this method to provenance study.LUO Chao ZHENG HongBo WU WeiHua WANG Ping CHEN YuLiang WEI XiaoChun 2012Chinese Science Bulletin2012,57,34:4
20Trajectory prediction of cyclist based on dynamic Bayesian network and long short-term memory model at unsignalized intersections显示文摘Cyclist trajectory prediction is of great significance for both active collision avoidance and path planning of intelligent vehicles.This paper presents a trajectory prediction method for the motion intention of cyclists in real traffic scenarios.This method is based on dynamic Bayesian network(DBN)and long short-term memory(LSTM).The motion intention of cyclists is hard to predict owing to potential large uncertainties.The DBN is used to infer the distribution of cyclists’intentions at intersections to improve the prediction time.The LSTM with encoder-decoder is used to predict the cyclists’trajectories to improve the accuracy of prediction.Therefore,the DBN and LSTM are adopted to guarantee prediction accuracy and improve the prediction time.The experiment results are presented to show the effectiveness of the predict strategies.Hongbo GAO Hang SU Yingfeng CAI Renfei WU Zhengyuan HAO Yongneng XU Wei WU Jianqing WANG Zhijun LI Zhen KAN 2021Science China(Information Sciences)2021,64,7:4
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