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Dynamical signatures of the one-dimensional deconfined quantum critical point

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Chinese Physics B 2022年第5期31卷 73-82页

作者： ning Xi Rong yu Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China

We study the critical scaling and dynamical signatures of fractionalized excitations at two different deconfined quantum critical points(DQCPs)in an S=1/2 spin chain using the time evolution of infinite matrix product *** scaling of the correlation functions and the dispersion of the conserved current correlations explicitly show the emergence of enhanced continuous symmetries at these *** dynamical structure factors in several different channels reveal the development of deconfined fractionalized excitations at the ***,we find an effective spin-charge separation at the DQCP between the ferromagnetic(FM)and valence bond solid(VBS)phases,and identify two continua associated with different types of fractionalized excitations at the DQCP between the X-direction and Z-direction FM *** findings not only provide direct evidence for the DQCP in one dimension but also shed light on exploring the DQCP in higher dimensions.

关键词： one-dimensional antiferromagnetism spin frustration deconfined quantum critical point spin dynamics infinite time-evolving block decimation

A Method for the Damage Detection of Pile Foundation in High-Pile Wharf Based on A Curvature Mode Deletion Model

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China Ocean Engineering 2020年第6期34卷 871-880页

作者： WANG Qi-ming ZHU Rui-hu ZHENG Jin-hai WANG ning LUO Meng-yan CHE yu-fei College of Science Hohai UniversityNanjing 210098China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

As the top of the pile foundation in high-pile wharf is connected to the superstructure and most of the pile bodies are located below the water surface, traditional damage detection methods are greatly limited in their application to pile foundation in service. In the present study, a new method for pile foundation damage detection is developed based on the curve shape of the curvature mode difference(CMD) before and after damage. In the method, the influence at each node on the overall CMD curve shape is analyzed through a data deletion model, statistical characteristic indexes are established to reflect the difference between damaged and undamaged units, and structural damage is accurately detected. The effectiveness and robustness of the method are verified by a finite element model(FEM) of high-pile wharf under different damage conditions and different intensities of Gaussian white noise. The applicability of the method is then experimentally validated by a physical model of high-pile wharf. Both the FEM and the experimental results show that the method is capable of detecting pile foundation damage in noisy curvature mode and has strong application potential.

关键词： high-pile wharf pile foundation curvature mode data deletion model damage detection

神经营养因子3经受体切换促进大鼠脊髓损伤后神经功能的恢复

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中国组织工程研究 2025年第11期29卷 2268-2276页

作者：丛岩于健孙志德康大伟承德医学院附属医院急诊科河北省承德市067000

背景:神经营养因子是治疗脊髓损伤的新方法,调控自噬是其发挥作用的机制之一,但具体的信号通路尚不明确。目的:探讨神经营养因子3如何通过P75NTR/Trk C受体切换来调节少突胶质细胞的自噬以及促进脊髓损伤后神经功能恢复的作用,进一步明... 详细信息

背景:神经营养因子是治疗脊髓损伤的新方法,调控自噬是其发挥作用的机制之一,但具体的信号通路尚不明确。目的:探讨神经营养因子3如何通过P75NTR/Trk C受体切换来调节少突胶质细胞的自噬以及促进脊髓损伤后神经功能恢复的作用,进一步明确具体的分子机制。方法:将24只SD大鼠随机分为3组:假手术组、脊髓损伤组和神经营养因子3组,通过大鼠后肢神经功能评分来评估神经营养因子3对脊髓损伤大鼠的治疗效果,采用Western blot检测各组大鼠脊髓组织中神经营养因子3、Olig1、MBP蛋白以及自噬标记蛋白LC3B的表达水平。在细胞实验中,将少突胶质细胞接种在培养皿中,分为糖氧剥夺组、糖氧剥夺+神经营养因子3组、糖氧剥夺+神经营养因子3+P75NTR质粒组、糖氧剥夺+神经营养因子3+Trk C质粒组、糖氧剥夺+3-甲基腺嘌呤(自噬抑制剂)组及糖氧剥夺+雷帕霉素(自噬激活剂)组。光学显微镜观察少突胶质细胞形态变化,TUNEL染色观察细胞凋亡现象,Western blot检测Trk C受体、P75NTR、LC3B表达及PI3K/AKT/m TOR和AMPK/m TOR信号途径的磷酸化状态。结果与结论:(1)动物实验显示,与假手术组相比,脊髓损伤后神经营养因子3的表达显著增加(P<0.05);与脊髓损伤组相比,外源性神经营养因子3治疗能够加快大鼠神经功能的恢复(P<0.05),并增加Olig1和MBP蛋白的表达(P<0.05);(2)细胞实验发现,3 h是损伤早期与中后期的分界点,与糖氧剥夺组相比,糖氧剥夺+神经营养因子3组少突胶质细胞能够更长时间地维持其形态,Trk C受体在早期表达水平较低而中后期显著上调(P<0.05),P75NTR则在早期上调而中后期下调(P<0.05),自噬水平呈现出先升高后降低的趋势(P<0.05);(3)通过对比糖氧剥夺+神经营养因子3组、糖氧剥夺+雷帕霉素组和糖氧剥夺+3-甲基腺嘌呤组的细胞形态和TUNEL染色结果,发现单独促进或抑制自噬对少突胶质细胞的存活均有不利影响,而类似神经营养因子3这样调节自噬的方法则能最大限度地维持细胞存活;(4)神经营养因子3在早期通过P75NTR/AMPK/m TOR信号通路促进自噬,而在后期通过Trk C/PI3K/AKT/m TOR信号通路抑制自噬。根据上述结果,得到如下结论,即神经营养因子3可以通过P75NTR/Trk C受体的切换能够双向调控少突胶质细胞的自噬,从而维持细胞存活,有助于脊髓损伤后大鼠的神经功能恢复。

关键词：神经营养因子3 自噬少突胶质细胞受体切换凋亡脊髓损伤

Influences of bubble size distribution on propagation of acoustic waves in dilute polydisperse bubbly liquids

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Journal of Hydrodynamics 2019年第1期31卷 50-57页

作者： yu-ning Zhang Zi-biao Jiang Jin yuan Ting Chen yu-ning Zhang1 ning-ning Tang Xiao-ze Du Key Laboratory of Condition Monitoring and Control for Power Plant Equipment (Ministry of Education) School of EnergyPower and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China School of Science Wuhan Institute of TechnologyWuhan 430205China College of Mechanical and Transportation Engineering China University of Petroleum - BeijingBeijing 102249China Beijing Key Laboratory of Process Fluid Filtration and Separation China University of Petroleum-BeijingBeijing 102249China

The present paper studies the influences of the bubble size distribution on the propagation of acoustic waves in dilute polydisperse bubbly liquids *** proposed approach is validated by using available experimental data in the *** is revealed that the bubble size distribution has impacts on both the wave speed and the wave ***,the minimum wave speed together with the corresponding frequency could be both significantly affected by the bubble size distribution (e.g.,the standard deviation).Furthermore,the maximum wave attenuation in the frequency response curve is also sensitive to the variations of the bubble size distribution.

关键词： Cavitation gas bubbles wave propagation wave speed wave attenuation

Electrochemically time-dependent oxidative coupling/couplingcyclization reaction between heterocycles:tunable synthesis of polycyclic indole derivatives with fluorescence properties

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Science China Chemistry 2022年第10期65卷 1962-1967页

作者： Zuozhou ning Zhicheng Zhang Qingsong yan Naifu Zhou Linzi Wen Xichao Peng yu Tang Pengju Feng Department of Chemistry Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China

A mild and practical protocol for selectively time-dependent dehydrogenative C–C coupling,as well as tandem couplingcyclization reaction between indoles or/and other heteroaromatics via electrochemically oxidative process has been *** reaction runs under noble catalyst,external oxidant and inert gas free condition,allowing tunable access to a wide variety of synthetically useful symmetrical or nonsymmetrical heteroarene with aggregation-induced emission(AIE),and polycyclic 3-D indole derivatives with aggregation-caused quenching(ACQ)fluorescence ***,preliminary mechanistic study indicated that tunable generation of indole cation under various electrolysis potential via regulating Nprotecting group was the key to achieve cross-coupling between indoles and other heteroaromatics.

关键词： electro-organic chemistry C-C coupling polycyclic indols Biaryls dearomatization

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Grid Integration of Wind Generation Considering Remote Wind Farms:Hybrid Markovian and Interval Unit Commitment

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IEEE/CAA Journal of Automatica Sinica 2017年第2期4卷 205-215页

作者： Bing yan Haipei Fan Peter B.Luh Khosrow Moslehi Xiaoming Feng Chien ning yu Mikhail A.Bragin Yaowen yu IEEE Department of Electrical & Computer Engineering University of Connecticut University of Connecticut ABB Inc. ABB Enterprise Software

Grid integration of wind power is essential to reduce fossil fuel usage but challenging in view of the intermittent nature of ***,we developed a hybrid Markovian and interval approach for the unit commitment and economic dispatch problem where power generation of conventional units is linked to local wind states to dampen the effects of wind ***,to reduce complexity,extreme and expected states are considered as interval *** this approach is effective,the fact that major wind farms are often located in remote locations and not accompanied by conventional units leads to conservative ***,weights of extreme and expected states in the objective function are difficult to tune,resulting in significant differences between optimization and simulation *** this paper,each remote wind farm is paired with a conventional unit to dampen the effects of wind uncertainties without using expensive utility-scaled battery storage,and extra constraints are innovatively established to model ***,proper weights are derived through a novel quadratic fit of cost *** problem is solved by using a creative integration of our recent surrogate Lagrangian relaxation and *** demonstrate modeling accuracy,computational efficiency,and significant reduction of conservativeness of the previous approach.

关键词： Branch-and-cut interval optimization Markov decision process remote wind farms surrogate Lagrangian relaxation(SLR) unit commitment

Successful steroid treatment for acute fibrinous and organizing pneumonia: A case report

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World Journal of Clinical Cases 2018年第15期6卷 1053-1058页

作者： Ya-Jing ning Pei-Shan Ding Zhang-yan Ke yan-Bei Zhang Rong-yu Liu Department of Geriatric Respiratory and Critical Care the First Affiliated Hospital of Anhui Medical University

BACKGROUND Since the acute fibrinous and organizing pneumonia(AFOP) was first described by Beasley in 2002, some case reports of patients aged from 38 d to 80 years have been published worldwide, but there is still no standard therapy for this disease and the treatment methods remain controversial. Both steroid and immunosuppressive agents, such as cyclophosphamide or mycophenolate mofetil, have been reported to be effective in some studies, but with many side effects, especially in patients of advanced age. CASE SUMMARY We herein report an 81-year-old female patient who was admitted to our hospital due to dry cough, and breathlessness for 1 mo. She was treated with broadspectrum antibiotics and anti-fungal therapy, but without improvement in both symptoms and radiological findings, and her respiratory status worsened, and she required bed rest almost the whole day. Computed tomography-guided percutaneous needle lung biopsy was performed and histopathology examination confirmed the diagnosis of AFOP. She was then successfully treated with a steroid monotherapy, which resulted in a satisfactory clinical outcome without serious complications. CONCLUSION We conclude that complete remission of AFOP can be achieved by steroid monotherapy in patients of advanced age.

关键词： Acute fibrinous and organizing pneumonia Geriatric Steroid Computed tomography-guided percutaneous needle lung biopsy Case report

Comparisons and analyses of vortex identification between Omega method and Q criterion

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Journal of Hydrodynamics 2019年第2期31卷 224-230页

作者： yu-ning Zhang Xiao-yu Wang Chaoqun Liu Key Laboratory of Condition Monitoring and Control for Power Plant Equipment(Ministry of Education) School of EnergyPower and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China College of Mechanical and Transportation Engineering China University of Petroleum-BeijingBeijing 102249China Beijing Key Laboratory of Process Fluid Filtration and Separation China University of Petroleum-BeijingBeijing 102249China Department of Mathematics University of Texas at ArlingtonArlington 76019、TexasUSA

The present paper presents comparisons of the vortex identification between the Omega method and the Q criterion based on the data of a classical *** the comparisons of the vortex structure together with the flow statistics,some important conclusions are drawn on the validity of the two methods,as *** Omega method can identify various kinds of vortices with different intensities(e.g.,the strong vortex,the medium vortex and the weak vortex).For the Q criterion,due to the subjective threshold selection,only the strong vortex with weak deformations could be ***,some emerging topics related with the advanced vortex identification methods are briefly discussed.

关键词： Vortex identification Galilean invariant Omega method

Bidirectional natural hybridization between sympatric Ligularia vellerea and L. subspicata

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Plant Diversity 2017年第4期39卷 214-220页

作者： Huai ning Jiaojun yu Xun Gong Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China University of Chinese Academy of Sciences Beijing 100049 China

Natural hybridization has been regarded as a crucial pathway of speciation and provides the raw materials for the evolution of biodiversity. The interspecific natural hybridization of the genus Ligularia *** universal and has been considered to be an important factor driving the high diversity of Ligularia species in the Hengduan Mountains, China. Although the natural hybridization between L. vellerea and L. subspicata was reported previously, the direction of hybridization was uncertain due to the limitation of sampling. Thus, in this study, we sampled more individuals and increased two fragments of chloroplast DNA on the basis of the previous study to further verify the natural hybridization between L. vellerea and L. subspicata and confirm the direction of hybridization. Based on DNA sequences(atpBrbcL, trnL-rpl32, trnQ-5'rps16, and nuclear ribosomal internal transcribed spacer region) data, we concluded that putative hybrids were primary products of hybridization between L. vellerea and L. subspicata and the hybridization was bidirectional. Moreover, sympatric L. tongolensis was not apparently involved in the hybridization. Surprisingly, some pure L. subspicata individuals showed the disaccordance between morphology and DNA data, which might indicate that introgression occurs between L. vellerea and L. subspicata.

关键词： Ligularia Natural hybridization Introgression cpDNA ITS