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Rapid Identification of Bibenzyls of Stemona sessilifolia using Hyphenated LC-UV-NMR and LC-MS Methods

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Chemical Research in Chinese Universities 2007年第1期23卷 48-51页

作者： yang Xin-zhou yang Yi-ping TANG Chun-ping KE Chang-qiang YE yang State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 P. R. China

As a part of the ongoing search for new constituents of Stemona species in China, chemical investigation of Stemona sessilifolia, a plant used in the traditional Chinese medicine to treat respiratory disorders, was carried out. To identify the chemical components rapidly, a selected sample of S. sessilifolia containing bibenzyls was tested using LC-ESIMS and analyzed further using stop-flow LC-UV-NMR, which was sensitive for the detection of the main constituents. LC microfractions were collected using the LC-UV-NMR technique and HR-EIMS off-line analysis was cartied out on the collected fractions. This chemical screening strategy allowed for the on-line identification of the main constituents of S. sessilifolia and provided information that was useful for a further peak-guided isolation procedure. Using these methods, four bibenzyls were isolated： two known compounds, 3,5-dihydroxy-4-methyl bibenzyl（1） and 3, 5-dihydroxy-2＇-methoxy-4-methyl bibenzyl （ 2 ）, and two novel compounds, 3,3＇-dihydroxy-5, 6＇-dimethoxy bibenzyl（3） and 3,5-dihydroxy-2＇, 5＇-dimethoxy bibenzyl （4）.

关键词： Bibenzyls LC-UV-NMR Stemona sessilifolia

Influence of carbon addition on mechanical properties of Fe-Mn-C twinning-induced plasticity steels

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Journal of Iron and Steel Research International 2022年第9期29卷 1446-1454页

作者： Peng Fu Zhi-bing Zheng Wei-ping yang Hao-kun yang School of Engineering Jiangxi Agricultural UniversityNanchang 330045JiangxiChina Institute of New Materials GuangdongAcademy of SciencesGuangdong Provincial iron Matrix Composite Engineering Research CenterGuangzhou 510650GuangdongChina Smart Manufacturing Division Hong Kong Productivity CouncilHong Kong 999077.China

Mechanical properties and microstructural evolution of Fe-22Mn-0.6C and Fe-22Mn-1.0C(wt.%)twinning-induced plasticity(TwIP)steels were investigated by monotonic,stress-relaxation and unloading-reloading tensile *** dynamic strain aging(DSA)effect,resulting from pinning of dislocations,effectively improved the dislocation activation volume of the two TWIP *** the meanwhile,DSA-facilitated twinning nucleation mechanism kept similar twinning capabilities of the two TWIP *** strain increasing,the formation of high-density deformation twins restricted the dislocation motion and reduced the activation volume with increasing ***,C addition simultaneously improved the ultimate tensile strength and uniform elongation,and significantly enhanced the friction stress,rather than back *** stronger short-range order effect,brought by friction stress,promotes the planar dislocation slipping,thus improving the work-hardening *** a result,the additional work-hardening capacity can be achieved in Fe-Mn-C with higher C addition.

关键词： Twinning induced plasticity steel Work-hardening rate Dynamic strain aging Short-range order Deformation twin

Repulsive and Restoring Casimir Forces Based on Magneto-Optical Effect

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Chinese Physics Letters 2011年第5期28卷 107-110页

作者： ZENG Ran yang Ya-ping School of Telecommunication Hangzhou Dianzi UniversityHangzhou 310018 Department of Physics Tongji UniversityShanghai 200092 Beijing Computational Science Research Center Beijing 100084

The Casimir force direction tuned by the external magnetic field due to the magneto-optical Voigt effect is *** magneto-optical effect gives rise to the modified frequency-dependent electric permittivity and thus the electromagnetic properties of the materials can be adjusted to satisfy the condition of the formation of repulsive Casimir *** is found that between the ordinary dielectric slab and magneto-optical material slab,a repulsive force may exist by adjusting the applied magnetic *** restoring Casimir force can also be obtained if suitable parameter values are *** realistic materials,the repulsive and the restoring force is shown to possibly take place at typical distances in microelectromechanical systems.

关键词： field force Casimir

Efficient scheme for realizing a multiplex-controlled phase gate with photonic qubits in circuit quantum electrodynamics

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Frontiers of physics 2022年第5期17卷 125-135页

作者： Qi-ping Su Yu Zhang Liang Bin Chui-ping yang School of Physics Hangzhou Normal UniversityHangzhou 311121China School of Physics Nanjing UniversityNanjing 210093China Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China

We propose an efficient scheme to implement a multiplex-controlled phase gate with multiple photonic qubits simultaneously controlling one target photonic qubit based on circuit quantum electrodynamics(QED).For convenience,we denote this multiqubit gate as MCP *** gate is realized by using a two-level coupler to couple multiple *** coupler here is a superconducting *** scheme is simple because the gate implementation requires only one step of *** addition,this scheme is quite general because the two logic states of each photonic qubit can be encoded with a vacuum state and an arbitrary non-vacuum state|φ>(e.g.,a Fock state,a superposition of Fock states,a cat state,or a coherent state,etc.)which is orthogonal or quasi-orthogonal to the vacuum *** scheme has some additional advantages:because only two levels of the coupler are used,i.e.,no auxiliary levels are utilized,decoherence from higher energy levels of the coupler is avoided;the gate operation time does not depend on the number of qubits;and the gate is implemented deterministically because no measurement is *** an example,we numerically analyze the circuit-QED based experimental feasibility of implementing a three-qubit MCP gate with photonic qubits each encoded via a vacuum state and a cat *** scheme can be applied to accomplish the same task in a wide range of physical system,which consists of multiple microwave or optical cavities coupled to a two-level coupler such as a natural or artificial atom.

关键词： multiplex controlled phase gate circuit QED

Preparation of maximally-entangled states with multiple cat-state qutrits in circuit QED

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Frontiers of physics 2024年第3期19卷 239-251页

作者： Chui-ping yang Jia-Heng Ni Liang Bin Yu Zhang yang Yu Qi-ping Su Department of Physics Hangzhou Normal UniversityHangzhou 311121China School of Physics Nanjing UniversityNanjing 210093China Institute for Quantum Science and Technology University of CalgaryAlberta T2N 1N4Canada

In recent years,cat-state encoding and high-dimensional entanglement have attracted much ***,previous works are limited to generation of entangled states of cat-state qubits(two-dimensional entanglement with cat-state encoding),while how to prepare entangled states of cat-state qutrits or qudits(high-dimensional entanglement with cat-state encoding)has not been *** here propose to generate a maximally-entangled state of multiple cat-state qutrits(three-dimensional entanglement by cat-state encoding)in circuit *** entangled state is prepared with multiple microwave cavities coupled to a superconducting flux ququart(a four-level quantum system).This proposal operates essentially by the cavity-qutrit dispersive *** circuit hardware resource is minimized because only a coupler ququart is *** higher intermediate level of the ququart is occupied only for a short time,thereby decoherence from this level is greatly suppressed during the state ***,the state preparation time does not depend on the number of the qutrits,thus it does not increase with the number of the *** an example,our numerical simulations demonstrate that,with the present circuit QED technology,the high-fidelity preparation is feasible for a maximally-entangled state of two cat-state ***,we numerically analyze the effect of the inter-cavity crosstalk on the scalability of this *** proposal is universal and can be extended to accomplish the same task with multiple microwave or optical cavities coupled to a natural or artificial four-level atom.

关键词： maximally-entangled states cat state qutrit circuit QED

Multiple biological functions and pharmacological effects of lycorine

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Science China Chemistry 2013年第10期56卷 1382-1391页

作者： CAO ZhiFei yang ping ZHOU QuanSheng Cyrus Tang Hematology Center Jiangsu Institute of Hematology The First Affiliated Hospital of Soochow University Key Laboratory of Thrombosis and Hemostasis Ministry of Health Soochow University

Lycorine is the major active component from the amaryllidaceae family plant Lycoris radiate,a represent traditional Chinese medicinal herb,and is one of the typical alkaloids with pyrrolophenanthridine nucleus *** has drawn great interest in medicinal field due to its divergent chemical structures and multiple biological functions,as well as pharmacological effects on various *** evidence shows that lycorine not only possesses strong pharmacological effects on many diseases,including anti-leukemia,anti-tumor,anti-angiogenesis,anti-virus,anti-bacteria,anti-inflammation,and anti-malaria,but also exerts many other biological functions,such as inhibition of acetylcholinesterase and topoisomerase,suppression of ascorbic acid biosynthesis,and control of circadian period ***,lycorine exhibits its numerous pharmacological effects on various diseases with very low toxicity and mild side *** divergent chemical structures,multiple biological functions,and very low toxicity of lycorine imply that the agent is a potential drug candidate that warrants for further preclinical and clinic investigation.

关键词： traditional Chinese medicinal herbs lycorine anti-cancer anti-virus angiogenesis neovascularization

Some Properties of Abnormal Extremals on Lie Groups

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Acta Mathematica Sinica,English Series 2014年第12期30卷 2119-2136页

作者： Ti Ren HUANG Xiao ping yang Department of Mathematics Zhejiang Sci-Tech University Department of Applied Mathematics Nanjing University of Science & Technology

Let G be a connected Lie group and D be a bracket generating left invariant *** this paper,first,we prove that all sub-Riemannian minimizers are smooth in Lie groups if the distribution D satisfies [D,[D,D]]D and [K,[K,K]]K for any proper sub-distribution K of ***,we prove that all sub-Riemannian minimizers are smooth in Lie group if the rank-3 distribution D satisfies Condition（B）.Third,we discuss characterizations of normal extremals,abnormal extremals,rigid curves,and minimizers on product sub-riemannian Lie *** prove that not all strictly abnormal minimizers are rigid curves and construct a strictly abnormal minimizer which is not a rigid curve.

关键词： Extremal geodesic rigid curve Lie group

Analysis of a Hyperbolic-Parabolic Type System for Image Inpainting

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Acta Mathematica Sinica,English Series 2012年第8期28卷 1663-1676页

作者： Zheng Meng JIN Xiao ping yang School of Science Nanjing University of Posts and Telecommunications School of Science Nanjing University of Science and Technology

In this paper we consider the initial boundary value problem of a hyperbolic-parabolic type system for image inpainting in a 2-D bounded domain, and establish the existence of weak solutions to the system by employing... 详细信息

关键词： Weak solutions hyperbolic-parabolic type system vanishing viscosity image inpainting

An Analysis of Two Variational Models for Speckle Reduction of Ultrasound Images

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Acta Mathematicae Applicatae Sinica 2016年第4期32卷 969-982页

作者： Zheng-meng JIN Xiao-ping yang School of Science Nanjing University of Posts and Telecommunications School of Science Nanjing University of Science and Technology

In this paper, we consider two variational models for speckle reduction of ultrasound images. By employing the F-convergence argument we show that the solution of the SO model coincides with the minimizer of the JY model. Furthermore, we incorporate the split Bregman technique to propose a fast alterative algorithm to solve the JY model. Some numericalexperiments are presented to illustrate the efficiency of the proposed algorithm.

关键词： BV F-convergence equivalence multiplicative noise Split Bregman algorithm