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血清肝纤维化指标与慢性肝炎肝纤维化程度的相关性

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世界华人消化杂志 2010年第14期18卷 1501-1503页

作者：胡兴荣崔显念胡启托陈军湖北省恩施自治州中心医院影像科湖北省恩施市445000 湖北省恩施自治州中心医院检验科湖北省恩施市445000 湖北民族学院医学院湖北省恩施市445000 武汉大学人民医院放射科湖北省武汉市430060

目的:评价血清肝纤维化指标与慢性肝炎肝纤维化程度病理分期的关系.方法:采用放射免疫技术对113例慢性肝炎患者的血清进行肝纤维化指标检测,包括透明质酸(HA)、层粘连蛋白(LN)、Ⅲ型前胶原蛋白(PCⅢ)、Ⅳ型胶原蛋白(Ⅳ-C).并按肝穿刺活... 详细信息

目的:评价血清肝纤维化指标与慢性肝炎肝纤维化程度病理分期的关系.方法:采用放射免疫技术对113例慢性肝炎患者的血清进行肝纤维化指标检测,包括透明质酸(HA)、层粘连蛋白(LN)、Ⅲ型前胶原蛋白(PCⅢ)、Ⅳ型胶原蛋白(Ⅳ-C).并按肝穿刺活检进行组织纤维化分期(S),对这些指标的诊断价值进行分析.结果:血清肝纤维化指标HA、PCⅢ、Ⅳ-C与肝组织纤维化程度相关(r=0.677,0.395,0.454,P0.05),HA、PCⅢ、Ⅳ-C均随着肝纤维化程度的加重而呈上升趋势.结论:血清肝纤维化指标对判断肝纤维化程度有一定指导意义,对于难以开展肝穿刺活检的单位可以帮助肝纤维化诊断.

关键词：肝活检肝纤维化透明质酸 Ⅲ型前胶原蛋白 Ⅳ型胶原蛋白层粘连蛋白

Unconventional phase transition of phase-change-memory materials for optical data storage

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Chinese Physics B 2019年第10期28卷 73-82页

作者： nian-Ke Chen xian-Bin Li State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University

Recent years, optically controlled phase-change memory draws intensive attention owing to some advanced applications including integrated all-optical nonvolatile memory, in-memory computing, and neuromorphic computing. The light-induced phase transition is the key for this technology. Traditional understanding on the role of light is the heating effect. Generally, the RESET operation of phase-change memory is believed to be a melt-quenching-amorphization process. However, some recent experimental and theoretical investigations have revealed that ultrafast laser can manipulate the structures of phase-change materials by non-thermal effects and induces unconventional phase transitions including solid-to-solid amorphization and order-to-order phase transitions. Compared with the conventional thermal amorphization,these transitions have potential superiors such as faster speed, better endurance, and low power consumption. This article summarizes some recent progress of experimental observations and theoretical analyses on these unconventional phase transitions. The discussions mainly focus on the physical mechanism at atomic scale to provide guidance to control the phase transitions for optical storage. Outlook on some possible applications of the non-thermal phase transition is also presented to develop new types of devices.

关键词： light-matter interaction phase-change memory non-thermal phase transition optical data storage

Exact solutions of non-Hermitian chains with asymmetric long-range hopping under specific boundary conditions

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Chinese Physics B 2022年第1期31卷 81-86页

作者： cui-xian Guo Shu Chen Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Yangtze River Delta Physics Research Center Liyang 213300China

We study the one-dimensional general non-Hermitian models with asymmetric long-range hopping and explore how to analytically solve the systems under some specific boundary *** the introduction of long-range hopping terms prevents us from finding analytical solutions for arbitrary boundary parameters,we identify the existence of exact solutions when the boundary parameters fulfill some constraint relations,which give the specific boundary *** analytical results show that the wave functions take simple forms and are independent of hopping range,while the eigenvalue spectra display rich model-dependent ***,we find the existence of a special point coined as pseudo-periodic boundary condition,for which the eigenvalues are the same as those of the periodical system when the hopping parameters fulfill certain conditions,whereas the eigenstates display the non-Hermitian skin effect.

关键词： non-Hermitian physics exact solution topological physics long-range hopping

Nanomaterials for electrochemical energy storage

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Frontiers of physics 2014年第3期9卷 323-350页

作者： nian Liu Weiyang Li Mauro Pasta Yi cui Department of Chemistry Stanford University Stanford CA 94305 USA Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA

The development of nanotechnology in the past two decades has generated great capability of controlling materials at the nanometer scale and has enabled exciting opportunities to design materials with desirable electronic, ionic, photonic, and mechanical properties. This development has also contributed to tile advance in energy storage, which is a critical technology in this century. In this article, we will review how the rational design of nanostructured materials has addressed the challenges of batteries and electrochemical capacitors and led to high-performance electrochemical energy storage devices. Four specific material systems will be discussed： i） nanostructured alloy anodes for Li-batteries, ii） nanostructured sulfur cathodes for Li-batteries, iii） nanoporous open- framework battery electrodes, and iv） nanostructured electrodes for electrochemical capacitors.

关键词： nanomaterial energy storage silicon anode sulfur cathode stationary battery electrochemical capacitors

Impurity effects of theΛhyperon in the hypernuclear systems^(25)ΛMg and(29)ΛSi

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Communications in Theoretical Physics 2021年第11期73卷 116-121页

作者： Ji-Wei cui xian-Rong Zhou School of Physics and Optoelectronic Engineering Xidian UniversityXi'an 710071China Department of Physics East China Normal UniversityShanghai 200241China

Based on the beyond-mean-field Skyrme-Hartree-Fock model,impurity effects of theΛhyperon in the hypernuclear systems^(25)ΛMg and^(29)ΛSi are investigated,*** cases,in which theΛhyperon occupies the single-particle orbitals L[000]1+/2,L[110]1-/2,L[101]3-/2 and L[101]1-/2,are *** each case,the potential energy surface and the energy curves projected on certain angular momenta are employed to show the influence of theΛhyperon on the nuclear *** the shrinkage effect that is induced by theΛhyperon occupying the sΛorbital,it is found that theΛhyperon on the pΛorbital,L[110]1-/2,drives the nuclear core toward a prolate shape,while the ones on the other two pΛorbitals,L[101]3-/2 and L[101]1-/2,drive the nuclear core toward an oblate *** energy spectra and the corresponding intra-band E2 transition rates for the rotational bands are given as a prediction for future experiments.

关键词： Λhypernuclei Skyrme-Hartree-Fock model angular momentum projection generator coordinate method

Enhanced second-order Stark effect in twisted bilayer graphene quantum dots

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Nano Research 2021年第11期14卷 3935-3941页

作者： xian Wang Yingqi cui Li Zhang Mingli Yang Institute of Atomic and Molecular Physics Sichuan UniversityChengdu610065China School of Physics and Electronic Engineering Zhengzhou Normal UniversityZhengzhou450044China

External electric field and interlayer twist introduce diverse changes in their confined electronic states of bilayer graphene quantum dots. Using a quantum-dot model, the band gaps of twisted bilayer graphene in finite sizes of about 1.4–2.4 nm with varying twist angles are studied in the presence of an electrostatic field perpendicular to the flakes by means of first-principles calculations. The size-dependent gaps are widened by the interlayer twist, but narrowed by the applied field. Their coupling, however, results in an enhanced Stark response in the twisted structures of which the field-induced band-gap variations are about 3–4 times as large as that of the corresponding untwisted structures under the same field strength. The exceptional Stark shifts come from the field-induced asynchronous shifts in their occupied and virtual energy levels, which are further enhanced by strong interlayer coupling at specific twist angles. Moreover, the shift of band gaps with the field strength follows the quadratic Stark response with large second-order shifting coefficients. The enhanced and tunable Stark shift suggests a gateway to the band engineering of bilayer graphene quantum dots by tuning their sizes, twist angles and their coupling with applied field.

关键词： twisted bilayer graphene electric field Stark effect first-principles calculations

Spin Filtering in a Rashba Electron Waveguide Induced by Edge Disorder

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Chinese Physics Letters 2012年第8期29卷 209-212页

作者： XIAO xian-Bo LI Fei LIU nian-Hua Institute for Advanced Study Nanchang UniversityNanchang 330031 School of Computer Jiangxi University of Traditional Chinese MedicineNanchang 330004

We theoretically study the spin-dependent electron transport in a Rashba electron waveguide with rough edges,attached to ideal leads without spin-orbit *** influence of the edge disorder on the charge and spin conductances is clarified by using the spin-resolved lattice Green function *** is found that a spin-polarized current can be generated in the output lead and its spin polarization can be manipulated by varying the waveguide *** underlying physics is attributed to the broken longitudinal symmetry and the spin-dependent quantum interference induced by the rough *** results may provide a new method to design a spin filter without using magnetic materials or applying a magnetic field.

关键词： waveguide polarization Waveguide

EEG-based Emotion Recognition Using Multiple Kernel Learning

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Machine Intelligence Research 2022年第5期19卷 472-484页

作者： Qian Cai Guo-Chong cui Hai-xian Wang School of Statistics and Data Science Nanjing Audit UniversityNanjing 211815China Key Laboratory of Child Development and Learning Science of Ministry of Education School of Biological Science&Medical EngineeringSoutheast UniversityNanjing 210096China Institute of Artificial Intelligence of Hefei Comprehensive National Science Center Hefei 230094China

Emotion recognition based on electroencephalography(EEG)has a wide range of applications and has great potential value,so it has received increasing attention from academia and industry in recent ***,multiple kernel learning(MKL)has also been favored by researchers for its data-driven convenience and high ***,there is little research on MKL in EEG-based emotion ***,this paper is dedicated to exploring the application of MKL methods in the field of EEG emotion recognition and promoting the application of MKL methods in EEG emotion ***,we proposed a support vector machine(SVM)classifier based on the MKL algorithm EasyMKL to investigate the feasibility of MKL algorithms in EEG-based emotion recognition *** designed two data partition methods,random division to verify the validity of the MKL method and sequential division to simulate practical ***,tri-categorization experiments were performed for neutral,negative and positive emotions based on a commonly used dataset,the Shanghai Jiao Tong University emotional EEG dataset(SEED).The average classification accuracies for random division and sequential division were 92.25%and 74.37%,respectively,which shows better classification performance than the traditional single kernel *** final results show that the MKL method is obviously effective,and the application of MKL in EEG emotion recognition is worthy of further *** the analysis of the experimental results,we discovered that the simple mathematical operations of the features on the symmetrical electrodes could not effectively integrate the spatial information of the EEG signals to obtain better *** is also confirmed that higher frequency band information is more correlated with emotional state and contributes more to emotion *** summary,this paper explores research on MKL methods in the field of EEG emotion recognition and provides a new way of thinking for EE

关键词： Emotion recognition electroencephalography(EEG) multiple kernel learning machine learning brain computer interface

Separation and enrichment mechanism of C54–TiSi_(2) from hypoeutectic Ti–65 wt.%Si alloy during directional solidification via alternating electromagnetic fields

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Journal of Iron and Steel Research International 2021年第1期28卷 29-37页

作者： Kui‑song Zhu Jing‑fei Hu Wen‑hui Ma Kui‑xian Wei Yong‑nian Dai The National Engineering Laboratory for Vacuum Metallurgy State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunming 650093YunnanChina College of Vanadium and Titanium Panzhihua UniversityPanzhihua 617000SichuanChina Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial UniversitiesKunming University of Science and TechnologyKunming 650093YunnanChina

The effects of directional solidification parameters and the coupling of directional solidification parameters and alternating electromagnetic fields on separation and enrichment of the C54–TiSi2 phase were investigated in a directionally solidified hypoeutectic Ti–65 wt.%Si *** results indicated that by increasing the pull-down velocity at a given position within the ingot,the cooling rate,growth rate,and temperature gradient of ingot could be *** a pull-down velocity near 5μm/s,the temperature gradient,cooling rate,and growth rate decreased with increasing the thickness of the C54–TiSi2-rich *** fields enhanced mass transfer at pull-down velocities of 5,10,15,and 20μm/s,with resulting enriched layer thicknesses of 15,10,10,and 5 mm,*** increasing the percentage of Ti in the Ti–Si alloy from 25 to 35 wt.%,the thickness of the C54–TiSi2-rich layer was increased from 2.5 to 3.3 ***,the maximum C54–TiSi2 content obtained experimentally in this layer decreased from 92.06 to 79.49 mass%.

关键词： Ti–Si alloy Directional solidification Electromagnetic field Separation C54–TiSi2