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Robust Nonparametric Function Estimation for Errors-in-variables Models

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Acta Mathematicae Applicatae Sinica 2020年第2期36卷 314-331页

作者： Chao-xia yuan Heng-jian CUI School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

This paper discusses robust nonparametric estimators of location regression function for errorsin-variables model with de-convolution *** local constant smoother is used for the estimation of the nonparametric function,and the local linear smoother is proposed to deal with the boundary problem,as well as to improve the local constant *** establish the asymptotic properties of the estimator,the influence function of the statistical functional and the breakdown point.A simulation study is carried out to demonstrate robust performance of the proposed *** motorcycle data is presented to illustrate the application of the robust estimator further.

关键词： errors-in-variables de-convolution kernel robust local linear

Local density of states around two nonmagnetic impurities in cuprate superconductors

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Frontiers of physics 2011年第3期6卷 309-312页

作者： Zhan-peng HUANG xia-xia WAN Feng yuan College of Physics Science Qingdao University Qingdao 266071 China

The local density of states （LDOS） around two nonmagnetic impurities which are located at different sites is studied within the two-dimensional t-J-U model. The order parameters are determined in a self-consistent way with the Gutzwiller projected mean-field approximation and the Bogoliubov-de Gennes theory. When the two impurities are located one or two sites away, we find the supercon- ductivity coherence peaks are more strongly suppressed and the zero-energy peak （ZEP） has split into two peaks. Whereas when the two impurities are located next to each other, the ZEP vanished, and LDOS does not change a lot compared with the case away from the impurities.

关键词： local density of states (LDOS) nonmagnetic impurities Gutzwiller approximation

Carbon nanotube prepared from carbon monoxide by CVD method and its application as electrode materials

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Rare Metals 2006年第Z2期25卷 73-76页

作者： AN Yuliang yuan xia CHENG Shinan GEN Xin Materials Science and Engineering College Shenyang Ligong University Shenyang 110168 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Materials Science and Engineering College Shenyang Ligong University Shenyang 110168 China Materials Science and Engineering College Shenyang Ligong University Shenyang 110168 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Carbon nanotubes with larger inner diameter were synthesized by the chemical vapor deposition of carbon monoxide (CO) on iron catalyst using H2S as promoting agent. It is found that the structure and morphology of carbon nanotubes can be tailored, to some degree, by varying the experimental conditions such as precursor components and process parameters. The results show that the presence of H2S may play key role for growing Y-branched carbon nanotubes. The products were characterized by SEM, TEM, and Raman spectroscopy, respectively. Furthermore, the obtained carbon nanotubes were explored as electrode materials for supercapacitor.

关键词： CNTs preparation CVD CO supercapacitor

Error-detected N-photon cluster state generation based on the controlled-phase gate using a quantum dot in an optical microcavity

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Frontiers of physics 2020年第2期15卷 1-11页

作者： Lei-xia Liang Yan-Yan Zheng yuan-xia Zhang Mei Zhang Department of Physics Applied Optics Beijing Area Major LaboratoryBeijing Normal UniversityBeijing 100875China School of Physics and Electronic Information Yan’an UniversityYan’an 716000China

We propose a scheme for error-detected generation of an AT-photon cluster state with a quantum dot(QD)embedded in a single-sided optical niicrocavity(QD-cavity system).The basic structure of this scheme is an error-detected controlled-phase(C-phase)gate on the hybrid electron-photon *** this scheme,the fidelity of N-photon cluster state generation can be reached imity even if low-Q cavity and cavity leakage are *** using error detecting,the generation of an AT-photon cluster state can be performed by repeating until success,which also leads to a high success probability,compared with other schemes assisted by the QD-cavity *** error-detected generation of an N-photon cluster state in the highly controllable way may benefit on the quantum network in the future.

关键词： controlled-phase gate cluster state error-detected QD-cavity system

Restricted Cohomology of Restricted Lie Superalgebras

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Acta Mathematica Sinica,English Series 2022年第11期38卷 2115-2130页

作者： Ji xia yuan Liang Yun CHEN Yan CAO School of Mathematical Sciences Heilongjiang UniversityHarbin 150080P.R.China School of Mathematical and Statistics Northeast Normal UniversityChangchun 130024P.R.China Department of Mathematics Harbin University of Science and TechnologyHarbin 150080P.R.China

Suppose the ground field F is an algebraically closed field characteristic of p>*** this paper,we investigate the restricted cohomology theory of restricted Lie *** interpretations of low dimensional restricted cohomology of restricted Lie superalgebra are *** show that there is a family of restricted model filiform Lie superalgebra Lλp,p structures parameterized by elementsλ∈*** explicitly describe both the 1-dimensional ordinary and restricted cohomology superspaces of Lλp,p with coefficients in the 1-dimensional trivial module and show that these superspaces are *** also describe the 2-dimensional ordinary and restricted cohomology superspaces of Lλp,p with coefficients in the 1-dimensional trivial module and show that these superspaces are unequal.

关键词： Restricted Lie superalgebras restricted cohomology restricted model filiform Lie superalgebras

Hydrogen-rich surface of MoC catalysts for efficient CO_(2) hydrogenation induced by a coupled hydrogen donator

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Nano Research 2024年第8期17卷 7762-7767页

作者： Dong Xu Si-yuan xia Qi-yuan Li Jie-Sheng Chen Xin-Hao Li School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China

Direct CO_(2) hydrogenation offers an important strategy for promoting the global carbon balance,but high thermodynamic and kinetic stability of CO_(2) has restricted its applicability to only a handful of industrial ***,we introduce a proof-of-concept application of the electron-rich Pt surface to promote hydrogen donation for electron-rich MoC particles acting as hydrogen acceptors,thereby constructing hydrogen-rich surface of MoC active ***,the formed hydrogen-rich and electronrich surface could greatly decrease reaction activation energy to boost the efficient CO_(2) hydrogenation into formic acid over the MoC *** optimized MoC@NC/Pt-0.1(NC:nitrogen-doped carbon)catalyst exhibits a high turnover frequency(TOF)value of 1.2 h^(−1) at a lower temperature of 60℃and a TOF of 24.2 h^(−1) under standard reaction conditions widely used in the literature,exceeding 7 times of MoC@NC catalyst and surpassing the benchmark classical non-noble metal active center-based heterogeneous catalyst.

关键词： electron-rich Pt nanoparticles hydrogen donation hydrogen-rich MoC nanoparticles CO_(2) hydrogenation formic acid

Anti-apoptotic effects of recombinant human granulocyte colony-stimulating factor in focal cerebral ischemic rats

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Neural Regeneration Research 2011年第11期6卷 839-844页

作者： xia yuan Shiming Zhang Wanli Dong Qi Fang Department of Neurology First Affiliated Hospital of Soochow University Suzhou 215006 Jiangsu Province China Department of Neurosurgery First Affiliated Hospital of Soochow University Suzhou 215006 Jiangsu Province China

The neuroprotective effects of granulocyte colony-stimulating factor in cerebral ischemia/reperfusion injury are currently contentious. The present study examined the effects of subcutaneous injection of recombinant human granulocyte colony-stimulating factor （50 pg/kg） over 5 days in a model of cerebral ischemia/reperfusion with intraluminal filament occlusion in rats. The results indicated that recombinant human granulocyte colony-stimulating factor reduced brain infarct volume following cerebral ischemia/reperfusion injury in rats, down-regulated the expression of caspase-3 mRNA （a key protease for apoptosis in the cerebral ischemia zone）, lowered the rate of neuronal apoptosis in the cerebral ischemia zone, and notably ameliorated neurological function. These results indicate that recombinant human granulocyte colony-stimulating factor has anti-apoptotic effects on neurons following focal cerebral ischemia/reperfusion injury, and exerts neuroprotective effects.

关键词： recombinant human granulocyte colony-stimulating factor cerebral ischemia/ reperfusion injury anti-apoptosis neural regeneration

地应力影响下的五孔掏槽爆破岩石损伤效应研究

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火工品 2025年第1期 89-96页

作者：杨赛群葛立芳李洪伟夏治园安徽江南爆破工程有限公司安徽宣城242000 安徽江南化工股份有限公司安徽合肥230088 安徽理工大学化工与爆破学院安徽淮南232001

在地下矿山开采过程中,地应力对巷道掘进效率的影响日益显著。本研究以某地下铁矿为研究对象,采用有限元软件LS-DYNA模拟不同地应力条件下五孔掏槽爆破掏槽孔孔间延期时间对岩石损伤程度的影响。通过现场爆破实验和块度识别软件验证模... 详细信息

在地下矿山开采过程中,地应力对巷道掘进效率的影响日益显著。本研究以某地下铁矿为研究对象,采用有限元软件LS-DYNA模拟不同地应力条件下五孔掏槽爆破掏槽孔孔间延期时间对岩石损伤程度的影响。通过现场爆破实验和块度识别软件验证模拟结果,探究了地应力、孔间延期时间与岩石损伤程度之间的关系。研究结果表明,地应力由0 MPa增加到10 MPa,五孔掏槽爆破掏槽孔最佳延期时间由60 ms减少为10 ms,相应的岩石损伤程度降低79%。地应力对爆破远区岩石裂纹的发育影响较大,而对近区影响较小。现场实验进一步证实了数值模拟的结论,表明可以根据实际地应力大小合理设置延期时间,有效降低大块率,提高爆破效率。

关键词：五孔掏槽爆破地应力延期时间 LS-DYNA 损伤程度

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The role of surface waves in the ocean mixed layer

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Acta Oceanologica Sinica 2008年第3期27卷 30-37页

作者： QIAO Fangli YANG Yongzeng xia Changshui yuan Yeli First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

Previously, most ocean circulation models have overlooked the role of the surface waves. As a result, these models have produced insufficient vertical mixing, with an under - prediction of the ,nixing layer （ML） depth and an over - prediction of the sea surface temperature （SST）, particularly during the summer season. As the ocean surface layer determines the lower boundary conditions of the atmosphere, this deficiency has severely limited the performance of the coupled ocean - atmospheric models and hence the climate studies. To overcome this shortcoming, a new parameterization for the wave effects in the ML model that will correct this systematic error of insufficient mixing. The new scheme has enabled the mixing layer to deepen, the surface excessive heating to be corrected, and an excellent agreement with observed global climatologic data. The study indicates that the surface waves are essential for ML formation, and that they are the primer drivers of the upper ocean dynamics; therefore, they are critical for climate studies.

关键词： wave - induced mixing ocean circulation model mixing layer