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Empirical likelihood confidence regions of the parameters in a partially linear single-index model

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Science China mathematics 2005年第10期48卷 1333-1348页

作者： XUE Liugen~1 & zhu Lixing~2.1. College of Applied Sciences,Beijing university of Technology,Beijing 10002.,China 2. {2. of mathematics,Hong Kong Baptist university,Hong Kong,China 1. College of Applied Sciences Beijing University of Technology 100022 Beijing China 2. department of mathematics Hong Kong Baptist University Hong Kong China

In this paper, a partially linear single-index model is investigated, and three empirical log-likelihood ratio statistics for the unknown parameters in the model are suggested. It is proved that the proposed statistics are asymptotically standard chi-square under some suitable conditions, and hence can be used to construct the confidence regions of the parameters. Our methods can also deal with the confidence region construction for the index in the pure single-index model. A simulation study indicates that, in terms of coverage probabilities and average areas of the confidence regions, the proposed methods perform better than the least-squares method.

关键词： partially linear single-index model, empirical likelihood, confidence region, chi-square distribution, coverage probability.

Few-shot incremental radar target recognition framework based on scattering-topology properties

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Chinese Journal of Aeronautics 2024年第8期37卷 246-260页

作者： Chenxuan LI Weigang zhu Bakun zhu Yonggang LI Graduate School Space Engineering UniversityBeijing 101400China department of Electronic and Optical Engineering Space Engineering UniversityBeijing 101400China

The continuous emergence of new targets in open scenarios leads to a substantial decrease in the performance of Inverse Synthetic Aperture Radar(ISAR)recognition ***,data scarcity further exacerbates the challenge of identifying new classes of ISAR *** this paper,a few-shot incremental target recognition framework based on Scattering-Topology Properties(STPIL)is ***,STPIL extracts scattering-topology properties of ISAR targets as recognition ***,the pseudo-incremental training strategy effectively alleviates the algorithm’s forgetting of old knowledge,and improves compatibility with new ***,a feature embedding network,with few parameters,is designed based on the graph neural *** embedding network is highly adaptable to changes in data ***,STPIL fully considers the joint distribution and marginal distribution in scattering features,and uses the Brownian distance metric module to make the scattering-topology features more *** results on both the simulation dataset and the public measured data indicate that STPIL can effectively balance new classes with old classes,and has superior performance to other advanced methods in the incremental recognition of targets.

关键词： Brownian distance metric Graph neural networks Incremental learning Inverse Synthetic Aperture Radar(ISAR) Scattering

Introduction to the first Jeme Tien Yow Lecture

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Underground Space 2024年第5期18卷 1-2页

作者： Hehua zhu department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

The Jeme Tien Yow Lecture is in honor of *** Tien Yow(1861–1919),the pioneer of tunneling and underground space engineering in China and also renowned as the"Father of Modern Chinese Engineering".The lecture is hosted and organized by the journal of Underground ***-Min Zhang will deliver the first Jeme Tien Yow Lecture on May 2.th,2.2.,at RM101,College of Civil Engineering,Tongji university,Shanghai,*** has submitted the corresponding research paper,coauthored with ***,for publication in the journal of Underground *** are delighted to see its publication together with this brief introduction.

关键词： journal underground Tie

Electronic Structures and Chemical Bonds of Cobaltite and Ni-Doped

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Journal of wuhan university of Technology(Materials Science) 2005年第3期20卷 48-51页

作者：闵新民 department of Applied Chemistry Wuhan University of Technology

The relation among electronic structure, chemical bond and thermoelectric property of Ca3 Co2.O6 and Ni-doped was studied by density function theory and discrete variation method（DFT-DVM）. The results indicate that the highest valence band（ HVB ）attd the lowest conduction band（ LCB ） are mainly attribuled to Co3d, Ni3d and O2. atomic orbitals. The property of a semiconductor is shown from the gap between HVB and LCB. The gap of Ni-doped one is less than that of Ca3 Co2.O6. The non-metal bond or ceramic characteristic of Ni-doped one is weaker than that of Ca3 Co2.O6, but the metal characteristics of Ni-doped one are stronger than those of Ca3 Co2.O6. The thermoelectric property should be improved by adding Ni element into the system of Ca3 Co2.O6 .

关键词： cobaltite Ni- doped electronic structure chemical bond thermoelectric property

非紧致一秩对称空间Cartan运动群上的Radon变换

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武汉大学学报（自然科学版） 1994年第5期40卷 6-12页

作者：朱赋鎏武汉大学数学系武汉430072

本文研究与非紧致一秩Riemann对称空间相应的Cartan运动群上的Radon变换,用Weyl分式积分求出了这种变换的逆,并用这种逆Radon变换导出Fourier代数中元素的局部正则性,最后证明了任一正则K-轨道不是Fourier代数的谱综合集。

关键词：一秩对称空间嘉当运动群拉东变换

Application of Component Technology to E-commerce System

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Geo-Spatial Information Science 2004年第4期7卷 308-310页

作者： zhu Jianfeng zhu Jianfeng, postgraduate, School of Information Management,{2., Luojia Hill, wuhan 430072.Economic Information Management department, Hubei Univisity of Economics, 33 Luoyu Road, wuhan 430079, China. School of Information Management Wuhan University Economic Information Management department Hubei Univisity of Economics

At present E-commerce system tends to become more complex, and traditional system designing methods can not fufil the need of E-commerce system, thus requiring an effective methodas solution. With this concern, this paper introduces some concepts of component technology, then brings forward the new connotation and basic features of component technology through the analysis of its technological character. This paper finally discusses the application of component technology to E-commerce system.

关键词： E-commerce component interface internet

Old Pinus massoniana forests benefit more from recent rapid warming in humid subtropical areas of central-southern China

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Journal of Forestry Research 2024年第5期35卷 155-170页

作者： Wenxin Li Liangjun zhu Lianhua zhu Mengdan Jing Censhi Qian Yu zhu Paolo Cherubini College of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004People’s Republic of China Swiss Federal Institute for Forest Snow and Landscape Research WSL8903 BirmensdorfSwitzerland department of Forest and Conservation Sciences Faculty of ForestryUniversity of British Columbia2004-2424 Main MallVancouverBC V6T 1Z4Canada

Trees progress through various growth stages,each marked by specific responses and adaptation strate-gies to environmental *** the importance of age-related growth responses on overall forest health and management policies,limited knowledge exists regarding age-related effects on dendroclimatic relationships in key subtropical tree *** this study,we employed a den-drochronological method to examine the impact of rapid warming on growth dynamics and climatic sensitivity of young(40–60 years)and old(100–180 years)Pinus mas-soniana forests across six sites in central-southern *** normalized log basal area increment of trees in both age groups increased significantly following rapid warming in *** in young forests further showed a distinct growth decline during a prolonged severe drought(2.04–2.13),whereas those in old forests maintained growth *** growth was more strongly influenced by temperature than by moisture,particularly in old *** tem-peratures strongly and positively impacted the growth of old trees but had a weaker effect on young *** forests had a significantly lower resistance to extreme drought but faster recovery compared to young ***“divergence problem”was more pronounced in younger forests due to their heightened sensitivity to warming-induced drought and heat *** ongoing warming,young forests also may initially experience a growth decline due to their heightened sensitivity to winter *** findings underscore the importance of considering age-dependent changes in forest/tree growth response to warming in subtropical forest man-agement,particularly in the context of achieving“Carbon Peak&Carbon Neutrality”goals in China.

关键词： Tree rings Pinus massoniana Age effects Drought resilience Subtropical forests Rapid warming

LARGE DEFLECTION OF SUBMERGED PIPELINES LAID WITH AN ARTICULATED STINGER

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China Ocean Engineering 1988年第3期2卷 115-126页

作者： Huang Yuying and zhu Dashan Professor, department of Mechanics, Huazhong {2. of Science and Technology, wuhan Lecturer, department of Mechanics, Huazhong {2. of Science and Technology, wuhan Dept. of Mechanics Huazhong Univ. of Sci. & Tech. Wuhan China

- An analytical method based on the Reference (Huang Yuying, 1986) is presented for finding the elastic deflection of pipelines laid with an articulated stinger. The suspended segment and the segment supported by the stinger are treated separately hnt simultaneously with the singular perturbation technique and by use of the continuous conditions at the joint between the two segments, an approximate solution of the second order to the deflection of the whole pipeline is obtained.

关键词： LARGE DEFLECTION OF SUBMERGED PIPELINES LAID WITH AN ARTICULATED STINGER

CHROMATOGRAPHIC SEPARATION ON GRAPHITE OF FULLERENE-C_(60) AND-C_(70)

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Chinese Chemical Letters 1993年第3期4卷 229-232页

作者： Ling zhu Han Yao LIANG Su Nian CHEN Rong Sheng SHENG department of Modern Analytical Science{2.,wuhan,430072

The mixture of fullerene—C_(60) and —C_(70) was successfully separated in larger amount by liquid chromatogra- phy on graphite *** column was first eluted with a mixture of hexane and toluene,and then with *** eluates were monitored by UV/visible absorption *** column shows high perfor- mance for *** much larger quantities of pure C_(60) can be easily obtained. The synthesis of fullerenes(C_(60) and C_(70))in macroscopic quantities has stimulated scientists to study on the method for separating C_(60) and C_(70).Because of the poor solubility of fullerenes C_(60)/C_(70) in most organic solvents,the separation of C_(60) and C_(70) proved to be a challenging *** attempts at the separation have used silica and alu- mina as the stationary phase and a mixture of hexane and benzene(or toluene)as the mobile phase. Fullerenes,however,have only limited solubility in hexane,these separations are usually only achieved by limit- ing the amount of sample to a few *** hexane-silica technique using phenylglycine based HPLC columns appears to offer good separation,but only for submilligram amounts. The use of graphite powder as the stationary phase in liquid chromatography is an advanced separation tech- nique for fullerenes C_(60)/C_(70).The technique is based on that the fullerene-C_(60) is different from C_(70) in the de- gree of electron delocalisation,and C_(60) is much less diamagnetic than C_(70).It is expected that the dissimilarity will cause the C_(60)/C_(70) molecules to exhibit different interactions with graphite,and can be separated from each other on this basis.

关键词： CHROMATOGRAPHIC SEPARATION ON GRAPHITE OF FULLERENE-C AND-C than