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Efficient Quantile Estimation for Functional-Coefficient Partially Linear Regression Models

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Chinese Annals of Mathematics,Series B 2011年第5期32卷 729-740页

作者： Zhangong ZHOU Rong JIANG weimin QIAN Department of Statistics Jiaxing University Jiaxing 314001zhejiang China Department of Mathematics Tongji University Shanghai 200092 China Corresponding author. Department of Mathematics Tongji University Shanghai 200092 China

The quantile estimation methods are proposed for functional-coefficient partially linear regression （FCPLR） model by combining nonparametric and functional-coefficient regression （FCR） model. The local linear scheme and the integrated method are used to obtain Focal quantile estimators of all unknown functions in the FCPLR model. These resulting estimators are asymptotically normal, but each of them has big variance. To reduce variances of these quantile estimators, the one-step backfitting technique is used to obtain the efficient quantile estimators of all unknown functions, and their asymptotic normalities are derived. Two simulated examples are carried out to illustrate the proposed estimation methodology.

关键词： Functional-coefficient model Quantile regression Local linear method Backfitting technique Asymptotic normality

Blueschist from the Toudaoqiao Area, Inner Mongolia, NE China: Evidence for the Suture between the Ergun and the Xing'an Blocks

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Journal of Earth Science 2017年第2期28卷 241-248页

作者： Limin Zhao Akira Takasu yongjiang Liu weimin Li College of Earth Sciences Jilin University Department of Geoscience Shimane University

Blueschist accompanied by pelitic schist expose along the Xinlin-Xiguitu fault in the Toudaoqiao area, northeastern China. In this paper, the blueschist is systematically studied on the petrography.and mineral chemistry. The amphiboles in the blueschist are zoned from winchite core to magnesioriebeckite/glaucophane rim to winchite outermost rim. The peak metamorphic conditions are defined by the mineral assemblage of magnesioriebeckite/glaucophane, epidote, high-Si phengite（Si〈7.1）, chlorite, albite, hematite and quartz, indicating an epidote-blueschist facies metamorphism. The P-T conditions are estimated as T=350–400 ℃ and P=10-12 kbar. The occurrence of the blueschist along the Xinlin-Xiguitu fault strongly suggests the fault is the suture between the Ergun and the Xing＇an blocks situated in the eastern portions of the Central Asia Orogenic Belt（CAOB）.

关键词： Toudaoqiao blueschists zoned amphibole P-T path Xinlin-Xiguitu suture

Translational Medicine Center of West China Hospital

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Science China(Life Sciences) 2016年第10期59卷 1055-1056页

作者： Hongxin Deng weimin Li yuquan Wei West China Hospital of Sichuan University Chengdu 610041China

Biotherapy Translational Medicine Center of West China Hospital, Sichuan University is one of the research centers in West China Hospital, which is located in High Tech Zone, Chengdu. It includes several core facilities, such as State Key Laboratory of Biotherapy/one of the National Research and Development （R＆D） Platforms for Novel Drugs,

关键词：医院医学转化国家重点实验室生物治疗研究与开发科研中心四川大学

Synthesis of branched ZnO nanorods on various substrates via a wet-chemistry route

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Particuology 2010年第5期8卷 458-462页

作者： Xianming Hou Lixia Wang Bo yu Feng Zhou weimin Liu Department of Chemistry Taishan University Taian 271021 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

Well-defined branched ZnO nanorods were fabricated on various substrates by a facile wet-chemistry route using a chemical bath deposition method at relatively low temperature. The structure, morphology.and properties of the as-synthesized material were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, UV-vis spectrometry.and photoluminescence （PL） spectrometry. Based on these characterizations, the growth process and synthesis mechanism were discussed in detail in terms of a combination of coordination agent and alkaline medium of hexamethylenetetramine used in the solutions. The effect of incubation time, solution composition and supported substrates on morphologies and sizes of the nanorods were further investigated. Meanwhile, the optical properties of branched ZnO nanorods on Zn substrate were measured.

关键词： Branched ZnO nanorodsZinc substrateWet-chemistry routeOptical properties

Plastic deformation behavior of Mg97Zn1y2 extruded alloys

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Transactions of Nonferrous Metals Society of China 2010年第7期20卷 1259-1268页

作者： K.HAGIHARA A.KINOSHITA y.SUGINO M.yAMASAKI y.KAWAMURA H.y.yASUDA y.UMAKOSHI Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka University2-1Yamada-okaSuitaOsaka 565-0871Japan Department of Materials Science Kumamoto University2-39-1KurokamiKumamoto 860-8555Japan National Institute for Materials Science 1-2-1SengenTsukubaIbaraki 305-0047Japan

The mechanical properties of the Mg97Znly2 extruded alloy containing the long-period stacking ordered phase, the so-called LPSO-phase, with a volume fraction of 24%-25%, were examined by compression tests and cyclic tension-compression deformation tests. The plastic behavior of the extruded alloys with compositions of Mg99.2Zn0.2y0.6 and Mg89Zn4y7 （molar fraction, %）, which were almost the same compositions of Mg matrix phase and LPSO phase in Mg97Zn1y2 Mg/LPSO two-phase alloy, respectively, were also prepared. By comparing their mechanical properties, the strengthening mechanisms operating in the Mg97Zn1 y2 extruded alloy were discussed. Existence of the LPSO-phase strongly enhanced the refinement of Mg matrix grain size during extrusion, which led to a large increment of the strength of alloy. In addition, the LPSO-phases, which were aligned along the extrusion direction in Mg97Zn1y2 extruded alloy, acted as hardening phases, just like reinforced fibers.

关键词： plastic deformation yield stress LPSO-phase dislocation twinning

Characterizing the capability of mesoscale eddies to carry drifters in the northwest Pacific

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Journal of Oceanology.and Limnology 2020年第6期38卷 1711-1728页

作者： WANG Huizan LIU Ding ZHANG weimin LI Jiaxun WANG Bo College of Meteorology.and Oceanography National University of Defense TechnologyChangsha 410073China Naval Research Academy Tianjin 300061China

Mesoscale eddies are common oceanic *** many related studies have been conducted,the ability for mesoscale eddies to carry real particles remains poorly *** considered the drifters as real particles to characterize the capability of mesoscale eddies to carry ***,mesoscale eddies in the northwest Pacific(99°E-180°E,0°-66°N)were identified using sea level anomaly(SLA)data from 1993 to ***,three important parameters(the carrying days,the number of circles the drifter revolving around the eddy center,and the carrying distances)were calculated by colocalizing eddy data with ***,statistical analysis and composite analysis were conducted,reflecting the capability of mesoscale eddies to carry *** mechanisms on the carrying capability of eddies were also *** show that(1)the motion of carried drifters reflects the upper limit of rotational speed of eddies that the drifters revolve around the eddy center by≤90°for one day in most cases;(2)the drifters tend to be carried for a longer time when their minimal distances to the eddy center measured with normalized distance are small;(3)there are two types of eddies(cyclonic and anticyclonic eddies)in different subregions of northwest Pacific,and each has a different carrying capability(on average,similar in the tropical ocean and Subtropical Countercurrent,cyclonic eddies tend to have stronger carrying capability in Southern Kuroshio Extension,and anticyclonic eddies tend to have stronger carrying capability in Northern Kuroshio Extension and Subarctic Gyre);(4)on average,the carried drifters tend to travel for a longer time around the normalized eddy radii ranging from 0.41 to 0.76;(5)the carrying days are related to the Rossby number of the eddy(in general when the Rossby number is smaller,the carrying days are longer).

关键词： mesoscale eddy drifter Rossby number composite analysis carrying capability

Performance of a Global Spectral Model with Dry Air-Mass and Total Air-Mass Conserving Dynamical Cores:A Case Study of the July 2021 Henan Extreme Rainfall Event

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Journal of Meteorological Research 2023年第1期37卷 20-44页

作者： Xiangrong yANG weimin ZHANG Jun PENG Shaoying LI Jianping WU College of Meteorology.and Oceanography National University of Defense TechnologyChangsha 410600

This study investigates the effects of the assumption on the types of air-mass conservation prescribed in numerical ***,predictions of the July 2021(“21.7”)Henan extreme rainfall event from the Integrated Forecast System(IFS)at ECMWF were compared with those from the yin-He Global Spectral Model(yHGSM),which is a global spectral model with total air-mass conservation(TMC)and dry air-mass conservation(DMC)***,a sensitivity test between simulations from the yHGSM adopting TMC and DMC was *** results show that both the IFS and yHGSM predicted relatively well the 24-h rainfall amount less than 100 mm day−1 on 20 and 21 July 2021 at lead times of 84,60,and 36 *** heavy precipitation exceeding 100 mm day−1,however,both models obviously underestimated the daily rainfall amount on 20 July 2021,but the yHGSM produced more precise and stable precipitation forecasts on these two days than the IFS,especially the maximum 24-h precipitation amount,with better consistency at lead times of 84,60,and 36 *** differences are further examined in the sensitivity *** from the yHGSM with DMC show rainfall distributions and daily rainfall amounts closer to the observations at longer lead *** is inferred that considering sources or sinks of total water in dynamical cores with DMC may have positive feedback for the precise prediction of *** extreme rainfall events,the high local loss of total water may have caused a loss of the atmospheric mass,leading to an additional decrease in surface ***,the unbalanced pressure gradient force enhances the cyclonic rotation of surface wind and strengthens convergence in the lower troposphere,which in turn further strengthens the vertical velocity,circularly contributing to the enhanced precipitation if the water vapor condition is favorable.

关键词： dry(total)air-mass conservation water source(sink) “21.7”Henan extreme rainfall global model

Study on the chaperone properties of conserved GTPases

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Protein & Cell 2012年第1期3卷 44-50页

作者： Xiang Wang Jiaying Xue Zhe Sun yan Qin weimin Gong RNA Lab Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100039China

As a large family of hydrolases,GTPases are widespread in cells and play the very important biological function of hydrolyzing GTP into GDP and inorganic phosphate through binding with *** are involved in cell cycle regulation,protein synthesis,and protein *** can facilitate the folding or refolding of nascent peptides and denatured proteins to their native ***,chaperones do not occur in the native structures in which they can perform their normal biological *** the current study,the chaperone activity of the conserved GTPases of Escherichia coli is tested by the chemical denaturation and chaperone-assisted renaturation of citrate synthase andα-*** effects of ribosomes and nucleotides on the chaperone activity are also *** data indicate that these conserved GTPases have chaperone properties,and may be ancestral protein folding factors that have appeared before dedicated chaperones.

关键词： protein folding chaperone conserved GTPase

A facile synthesis of non-aqueous LiPO_(2)F_(2) solution as the electrolyte additive for high performance lithium ion batteries

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Chinese Chemical Letters 2020年第12期31卷 3209-3212页

作者： weimin Zhao Fucheng Ren Qizhang yan Haodong Liu yong yang College of Cheical Engineering and Safety Binzhou UniversityBinzhou 256503China State Key Laboratory for Physical Chemisiry of Solid Surfaces and Department of ChemistryCollege of Cchemistry and Chemical tngineering Ximen UriversityXiammen 36I005China Department of Nanoengineering University of California San DiegoLa Jolla 92093United States

Constructing a reliable and favorable electrode-electrolyte interface is crucial to utilize the exceptional energy storage capability in commercial lithium-ion ***,we report a facile synthesis approach for the lithium difluorophosphate(LiPO_(2)F_(2))solution as an effective film-forming additive via direct adding the Li_(2)CO_(3) into LiPF6 solution at 45℃.Benefiting from the significantly reduced interface resistance(RSEI)and charge transfer impedance(Rct)of both the cathode and anode by adding the prepared LiPO_(2)F_(2)solution into a baseline electrolyte,the cycling performance of the graphite||LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2) pouch cell is remarkably improved under all-climate condition.

关键词： Lithium difluorophosphate(LiPO_(2)F_(2)) solution Electrolyte additives Electrode-electrolyte interface Synthesis Li-ion batteries