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| 1 | Partial functional linear quantile regression显示文摘This paper studies estimation in partial functional linear quantile regression in which the dependent variable is related to both a vector of finite length and a function-valued random variable as predictor variables.The slope function is estimated by the functional principal component basis. The asymptotic distribution of the estimator of the vector of slope parameters is derived and the global convergence rate of the quantile estimator of unknown slope function is established under suitable norm. It is showed that this rate is optimal in a minimax sense under some smoothness assumptions on the covariance kernel of the covariate and the slope function. The convergence rate of the mean squared prediction error for the proposed estimators is also established. Finite sample properties of our procedures are studied through Monte Carlo simulations. A real data example about Berkeley growth data is used to illustrate our proposed methodology. | TANG QingGuo CHENG LongSheng | 2014 | Science China Mathematics2014，57，12： | 3 |
| 2 | B-spline estimation for varying coefficient regression with spatial data显示文摘This paper considers a nonparametric varying coefficient regression with spatial data. A global smoothing procedure is developed by using B-spline function approximations for estimating the coefficient functions. Under mild regularity assumptions,the global convergence rates of the B-spline estimators of the unknown coefficient functions are established. Asymptotic results show that our B-spline estimators achieve the optimal convergence rate. The asymptotic distributions of the B-spline estimators of the unknown coefficient functions are also derived. A procedure for selecting smoothing parameters is given. Finite sample properties of our procedures are studied through Monte Carlo simulations. Application of the proposed method is demonstrated by examining voting behaviors across US counties in the 1980 presidential election. | TANG QingGuo CHENG LongSheng | 2009 | Science China Mathematics2009，52，11： | 3 |
| 3 | Community Structure and Value Evaluation of Local Brassicaceae Potherbs in Shiyan City显示文摘[Objectives]This study was conducted to evaluate the value of local Brassicaceae potherb resources in Shiyan City.[Methods]Seven species of local Brassicaceae edible plants resources in Shiyan City,including Cardamine hirsuta L.,Cardamine flexuosa,Cardamine impatiens L.,Capsella bursa-pastoris(Linn.),Orychophragmus violaceus(L.)O.E.Schulz,Draba nemorosa L.,Rorippa indica(L.)Hiern.,were investigated using sampling method,and their value was evaluated.[Results]①Shiyan City was rich in resources of local Brassicaceae potherbs,mostly of which grew in humid areas.②In the communities of target species,there were 20 species of plants in 19 genera of 15 families in the arbor layer,19 species of plants in 16 genera from 15 families in the shrub layer,and 58 species of plants in 51 genera from 23 families in the herbaceous layer.The tree,shrub and herb species with the highest dominance Populus simonii var.przewalskii,Robinia pseudoacacia and Chrysanthemum indicum.Local Brassicaceae potherbs in Shiyan City have high edible and medicinal value,especially Cardamine,which has strong selenium-rich ability and is worthy of vigorous development.[Conclusions]This study provides scientific basis and reference for the development and utilization of local potherbs of Brassicaceae in this area. | Yaowen XU Shuiyuan CHENG Yongjun FEI Zurong CAO Yingjie LI Longsheng HU | 2021 | Agricultural Biotechnology2021，10，5： | 0 |
| 4 | Observation of Collimated Atoms by Light Pressure Force in Absorption Cell显示文摘Experimental observation of laser cooling and collimation of moving atoms in an absorption cell by light pressure force of an intense standing light wave field is reported.The hyper fine structure of atomic sodium has been observed due to the cooled and collimated atoms.The mechanism of laser cooling and collimation of atoms is discussed. | WANG Yuzhu YE Chao WU Yongsheng WANG Xiaojuan ZHOU Shanyu CHENG Yudan MA Longsheng DING Liangen | 1993 | Chinese Physics Letters1993，10，4： | 0 |
| 5 | Oblique shock train motion based on schlieren image processing显示文摘In this paper,shock train motion in a Mach number 2.7 duct is studied experimentally,and large numbers of schlieren images are obtained by a high-speed camera.An image processing method based on Maximum Correlation Detection(MCD)is proposed to detect shock train motion from the schlieren images,based on which the key structures,e.g.,separation positions and separation shock angles on the top and bottom walls,can be analysed in detail.The oscillations of the shock train are generated by rhombus and ellipse shafts at various excitation frequencies.According to the analysis of MCD results,the distributions of the frequency components of shock train oscillation generated by the two shafts are distinctly different,in which the motion generated by the ellipse shaft is much smoother;shock train motion is mainly characterized by the oscillation of separation position while the separation shock strength is not so sensitive to downstream disturbance;there is a hysteresis loop relation between the downstream pressure and separation position. | Longsheng XUE Chuan CHENG Chengpeng WANG Lantian ZHANG Kang LI Keming CHENG | 2023 | Chinese Journal of Aeronautics2023，36，3： | 0 |
| 6 | Two-dimensional layered In_(2)P_(3)S_(9): A novel superior anode material for sodium-ion batteries显示文摘Developing reliable and efficient anode materials is essential for the successfully practical application of sodium-ion batteries.Herein,employing a straightforward and rapid chemical vapor deposition technique,two-dimensional layered ternary indium phosphorus sulfide(In_(2)P_(3)S_(9)) nanosheets are prepared.The layered structure and ternary composition of the In_(2)P_(3)S_(9) electrode result in impressive electrochemical performance,including a high reversible capacity of 704 mA h g^(-1) at 0.1 A g^(-1),an outstanding rate capability with 425 mA h g^(-1) at 5 A g^(-1),and an exceptional cycling stability with a capacity retention of88% after 350 cycles at 1 A g^(-1).Furthermore,sodium-ion full cell also affords a high capacity of 308 and114 mA h g^(-1) at 0.1 and 5 A g^(-1).Ex-situ X-ray diffraction and ex-situ high-resolution transmission electron microscopy tests are conducted to investigate the underlying Na-storage mechanism of In_(2)P_(3)S_(9).The results reveal that during the first cycle,the P-S bond is broken to form the elemental P and In_(2)S_(3),collectively contributing to a remarkably high reversible specific capacity.The excellent electrochemical energy storage results corroborate the practical application potential of In_(2)P_(3)S_(9) for sodium-ion batteries. | Longsheng Zhong Hongneng Chen Yanzhe Sheng Yiting Sun Yanhe Xiao Baochang Cheng Shuijin Lei | 2024 | Journal of Energy Chemistry2024，90，3： | 0 |
| 7 | An integration method based on a novel combined flow for aerodynamic configuration of strutjet engine显示文摘In this paper a novel design method of aerodynamic configuration is proposed to integrate forebody,strut and inlet for strutjet engine,and a model at design point of Mach number6 is generated to investigate the aerodynamic performance by both simulations and experiments.The basic flow field employed by proposed method is a combined flow named IBB,which is combined by Internal Conical Flow A(ICFA),truncated Busemann flow I(BI)for external section,and truncated Busemann flow II(BII)for internal section.The model configuration is generated by streamline tracing method from basic flow field,in which the forebody section is traced from ICFA and BI flows,and the inlet as well as strut section is traced from BII flow.The simulations in Mach number 4,5,and 6 demonstrate uniform starting flow fields with relatively high total pressure recovery,which agree well with experiments in wind tunnel.Additionally,in low Mach number cases,this inlet could start at Mach number 3 while it is unstarted at Mach number 2.7;in high Mach number cases,a uniform flow could still exist in Mach number 6.5 while a relatively strong shock wave boundary layer interaction is found in cowl area of Mach number 7 case,indicating the inlet designed by proposed method works in a relatively wide Mach number range. | Longsheng XUE Chuan CHENG Chengpeng WANG Keming CHENG | 2021 | Chinese Journal of Aeronautics2021，34，9： | 0 |
| 8 | Mahalanobis-Taguchi system: a systematic review from theory to application显示文摘The Mahalanobis-Taguchi system(MTS)is a relatively new multi-dimensional pattern recogni-tion technology that combines Mahalanobis distance(MD)with Taguchi’s robust engineering for diagnosis and prognosis.MTS operation process generally consists of four specialised stages,namely,Mahalanobis space(MS)construction,MS validation,MS optimisation,and diagnosis and prognosis.In recent years,a significant amount of research work has been conducted on the improvement of key technologies and these four processes.Numerous applications of MTS have also been studied in various fields.There are,of course,excellent reviews of theoretical research and applied research of MTS.However,there is no systematic review that covers both theoretical and applied research comprehensively.To fill this gap,this paper reviews MTS from key technolo-gies,four processes and application research,and provides researchers with a discussion of the current situation,upcoming challenges and possible future trends. | Zhaiming Peng Longsheng Cheng Qifeng Yao Hanting Zhou | 2022 | Journal of Control and Decision2022，9，2： | 0 |
| 9 | INFLUENCE OF RARE EARTH ON INTERGRANULAR CRACKING OF 9% Ni CAST STEEL显示文摘The intergranular cracking of 9% Ni cast steel seems mainly to relate to the segregation ofcontaminates H,S and P along boundaries.An addition of rare earth may eliminate the seg-regation of these contaminates along grain boundaries and improve the binding force amongboundaries,so as to reduce remarkably the intergranular cracking. | ZHANG Wei LI Longsheng CHENG Ji Dalian University of Technology,Dalian,China Lecturer,Dept.of Materials Engineering,Dalian University of Technology,Dalian 116023,China | 1990 | Acta Metallurgica Sinica(English Letters)1990，3，5： | 0 |
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