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Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 125-134页

作者： Chuang Li lun-hui hu Fu-Chun Zhang Department of Physics Zhejiang UniversityHangzhou 310027China Kavli Institute for Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Physics University of CaliforniaSan Diego CA 92093USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

In a superconducting topological insulator, a superconducting vortex line can trap a one-dimensional topological band with localized Majorana zero modes at the ends. Here, we study the effect of hexagonal warping and its corresponding symmetry-breaking effect on vortex phase transition. We perform both analytical calculations based on a semiclassical formula and numerical calculations based on full quantum mechanics using the Bogoliubov-de Gennes equation. We find that the hexagonal warping term extends the topological region of the vortex line as the chemical potential changes and leads to MZMs, even in the absence of topological surface states.

关键词： topological insulator topological superconductor vortex phase transition Majorana zero modes hexagonal warping

High-order time-reversal symmetry breaking normal state

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 136-148页

作者： Meng Zeng lun-hui hu Hong-Ye hu Yi-Zhuang You Congjun Wu Department of Physics University of CaliforniaSan DiegoCalifornia 92093USA Department of Physics Zhejiang UniversityHangzhou 310058China New Cornerstone Science Laboratory Department of PhysicsSchoolof ScienceWestlake UniversityHangzhou 30024China Institute for Theoretical Sciences Westlake UniversityHangzhou 310024China Key Laboratory for Quantum Materials of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310024China

Spontaneous time-reversal symmetry breaking plays an important role in studying strongly correlated unconventional *** two superconducting gap functions with different symmetries compete,the relative phase channel(θ_(-)≡θ_(1)-θ_(2))exhibits an Ising-type Z_(2) symmetry due to the second order Josephson coupling,where θ_(1,2) are the phases of two gap *** contrast,the U(1) symmetry in the channel of θ_(+)≡(θ_(1)+θ_(2))/2 is *** phase locking,i.e.,ordering of θ_(-),can take place in the phase fluctuation regime before the onset of superconductivity,i.e.,when θ_(+) is *** θ_(-) is pinned at ±π/2,then timereversal symmetry is broken in the normal state,otherwise,if θ_(-)=0,or,π,rotational symmetry is broken,leading to a nematic normal *** both cases,the order parameters possess a 4-fermion structure beyond the scope of mean-field theory,which can be viewed as a high order symmetry *** employ an effective two-component XY-model assisted by a renormalization group analysis to address this *** a natural by-product,we also find the other interesting intermediate phase corresponds to ordering of θ_+ but with θ_(-)*** is the quartetting,or,charge-4e,superconductivity,which occurs above the low temperature Z_(2)-breaking charge-2e superconducting *** results provide useful guidance for studying novel symmetry breaking phases in strongly correlated superconductors.

关键词： superconductivity strong correlation time-reversal breaking charge-4e

A Cryptographic Scheme Based on Spatiotemporal Chaos of Coupled Map Lattices

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Communications in Theoretical Physics 2006年第3期45卷 477-482页

作者： MA hui CHEN Tian-lun Institute of Physics Nankai University Tianjin 300071 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

We propose a cryptographic scheme based on spatiotemporal chaos of coupled map lattices （CIVIL） ,which is based on one-time pad. The structure of the cryptosystem determines that the progress in decryption implies the progress in exploring the dynamical behavior of spatiotemporal chaos in CML. A part of the initial condition of CML is used as a secret key, and the recovery of the secret key by exhaustive search is impossible due to the sensitivity to the initial condition in spatiotemporal chaos system. Specially the software implementation of the scheme is easy.

关键词： spatiotemporal chaos coupled map lattices cryptography

Improvement in Time Efficiency in Numerical Simulation for Solid Propellant Rocket Motors(SPRM)

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推进技术 2018年第1期39卷 92-99页

作者： Valeriy BUCHARSKYI ZHANG Li-hui WAN Yi-lun Propulsion System Design Dept Dnipro National University Dnipro 49000 Ukraine School of Astronautics Beihang University Beijing 100191 China

The main purpose of the present work is to study the possibilities of reducing calculation time while maintaining the validity in the numerical simulation of the combustion product flow in SPRM *** ways of decreasing the calculation time-the use of numerical methods of high accuracy order,the reduction in spatial dimension of the problem,and the use of physical features of the processes in SPRM chamber while constructing a calculation model-were *** calculation data show that the use of these approaches makes it possible to reduce the time for solving the problems of SPRM simulation significantly(up to 100times).Also conclusions about the applicability of the mentioned above approaches in SPRM design were made.

关键词： Numerical simulation Solid propellant rocket motor Calculation time reduction

Liver transplantation for late-onset ornithine transcarbamylase deficiency:A case report

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World Journal of Clinical Cases 2022年第18期10卷 6156-6162页

作者： Xiao-hui Fu Yu-hui hu Jian-Xiang Liao Li Chen Zhan-Qi hu Jia-lun Wen Shu-Li Chen Department of Inherited Metabolic Disorders The Affiliated Hospital of China Medical University and Shenzhen Children’s HospitalShenzhen 518038Guangdong ProvinceChina Department of Neurology The Affiliated Hospital of China Medical University and Shenzhen Children’s HospitalShenzhen 518038Guangdong ProvinceChina

BACKGROUND Ornithine transcarbamylase deficiency(OTCD)is an X-linked inherited disorder and characterized by marked elevation of blood *** goal of treatment is to minimize the neurological damage caused by *** can be cured by liver transplantation(LT).Post-transplant patients can discontinue anti-hyperammonemia agents and consume a regular diet without the risk of developing *** neurological damage caused by hyperammonemia is almost *** SUMMARY An 11.7-year-old boy presented with headache,vomiting,and altered *** patient was diagnosed with late-onset *** nitrogen scavenging treatment and a protein-free diet,ammonia levels were reduced to normal on the third day of ***,the patient remained in a moderate *** discussion,LT was *** LT,the patient’s blood ammonia and biochemical indicators stabilized in the normal range,he regained consciousness,and his nervous system function significantly *** months after LT,blood amino acids and urine organic acids were normal,and brain magnetic resonance imaging showed a decrease in subcortical *** LT can significantly improve partial neurological impairment caused by late-onset OTCD hyperammonemic encephalopathy,and LT can be actively considered when early drug therapy is ineffective.

关键词： Ornithine transcarbamylase deficiency Urea cycle disorder Hyperammonemic encephalopathy Liver transplantation Case report

Effects of N source and nitrification pretreatment on growth of Arthrospira platensis in human urine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1846-1852页

作者： FENG Dao-lun WU Zu-cheng WANG Da-hui Department of Environmental Science and Engineering Zhejiang University Hangzhou 310027 China

Culture ofArthrospiraplatensis （Spirulinaplatens） in human urine was investigated to get valuable biomass. NO3-N was the proper N source, in comparison with other N source, including urea, NH4-N and NO2-N. As a result, aerobic nitrification of human urine was performed, with above 93.6% nitrification percentage finally achieved with total-N （TN） load of 46.52 mg/（L.d）, in which Arthrospira platensis was successfully grown. The main compositions of the obtained biomass are close to those in Zarrouk medium. Thus, it is possible to culture Arthrospiraplatensis in nitrified human urine for food production within bioregenerative life support systems （BLSSs）.

关键词： Arthrospira platensis human urine N source Nitrification Bioregenerative life support system (BLSS)

A Self-synchronizing Stream Encryption Scheme Based on One-Dimensional Coupled Map Lattices

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Communications in Theoretical Physics 2007年第4期47卷 679-684页

作者： MA hui Zhu Kai-En CHEN Tian-lun Institute of Physics Nankai University Tianjin 300071 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

We present a self-synchronizing stream encryption scheme based on one-dimensional coupled map lattices which is introduced as a model with the essential features of spatiotemporal chaos, and of great complexity and diffusion capability of the little disturbance in the initial condition. To evaluate the scheme, a series of statistical tests are employed, and the results show good random-look nature of the ciphertext. Furthermore, we apply our algorithm to encrypt a grey-scale image to show the key sensitivity.

关键词： self-synchronizing stream encryption one-dimensional coupled map lattices

Modulating the Electronic Structures of Single-walled Carbon Nanotubes by Filling with Electron Acceptors and the Effect on Their Reactivity with Aryl Diazonium Salts

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Chinese Journal of Structural Chemistry 2013年第12期32卷 1911-1915页

作者： WANG Hong-Tao WU Chu-Xin GUAN lun-hui State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences University of Chinese Academy of Sciences

The electronic structures of single-walled carbon nanotubes （SWCNTs） were modulated by filling with tetracyanoquinodimethane （TCNQ）, a strong electron acceptor. The structures of TCNQ-filled SWCNTs were checked by X-ray diffraction analysis, high-resolution transmission electron microscopy and Raman spectroscopy. Optical absorption spectroscopy demonstrated an enhanced reactivity between aryl diazonium and semiconducting SWCNTs.

关键词： carbon nanotubes electronic structures chemical reactivity doping

Electrochemical Analysis of Single Glucose Oxidase with a Nanopipette

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Chemical Research in Chinese Universities 2024年第2期40卷 272-278页

作者： WANG Yongyong MA hui LONG Yi-Tao YING Yi-lun School of Chemistry and Chemical Engineering Molecular Sensing and Imaging Center(MSIC)Nanjing UniversityNanjing210023P.R.China

Nanopore-based electrochemical technique is a promising tool for detecting single ***,detecting single proteins using a nanopipette in their native state without labeling is challenging due to the rapid translocation,which results in an inefficient signal *** our study,we finely tuned the driving force equilibrium between electrophoretic force(EPF)and electroosmotic flow(EOF)inside the nanopipette for efficient sensing of single glucose oxidase(GOD)*** duration time of GOD within the nanopipette is extended to about 4 *** strategy provided clear ionic current signals with a signal-to-noise ratio of *** EPF increased in the direction opposite to the motion of GOD,we observed a nonlinear growth in GOD’s duration *** extended the duration to about 4.4 times longer at−1000 mV compared to at−800 ***,nanopore-based electrochemical sensing could be used for single GOD molecule analysis as an ultrasensitive method.

关键词： Nanopore Single-molecule analysis Glucose oxidase Electrophoretic force Electroosmotic flow

Two-dimensional superconducting MoSi2N4(MoN)4n homologous compounds

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National Science Review 2023年第4期10卷 142-149页

作者： Zhibo Liu Lei Wang Yi-lun Hong Xing-Qiu Chen hui-Ming Cheng Wencai Ren Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

The number and stacking order of layers are two important degrees of freedom that can modulate the properties of 2D van der Waals(vdW) materials. However, the layers’ structures are essentially limited to the known layered 3D vdW materials. Recently, a new 2D vdW material, MoSi2N4, without known 3D counterparts, was synthesized by passivating the surface dangling bonds of non-layered 2D molybdenum nitride with elemental silicon, whose monolayer can be viewed as a monolayer MoN(-N-Mo-N-)sandwiched between two Si-N layers. This unique sandwich structure endows the MoSi2N4monolayer with many fascinating properties and intriguing applications, and the surface-passivating growth method creates the possibility of tuning the layer’s structure of 2D vdW materials. Here we synthesized a series of MoSi2N4(MoN)4nstructures confined in the matrix of multilayer MoSi2N4. These super-thick monolayers are the homologous compounds of MoSi2N4, which can be viewed as multilayer MoN(Mo4n+1N4n+2)sandwiched between two Si-N layers. First-principles calculations show that MoSi2N4(MoN)4monolayers have much higher Young’s modulus than Mo N, which is atributed to the strong Si-N bonds on the ***, different from the semiconducting nature of the Mo Si2N4monolayer, the MoSi2N4(MoN)4monolayer is identified as a superconductor with a transition temperature of 9.02 K. The discovery of MoSi2N4(MoN)4nstructures not only expands the family of 2D materials but also brings a new degree of freedom to tailor the structure of 2D vd W materials, which may lead to unexpected novel properties and applications.

关键词： MoSi2N4 2D layered materials homologous compounds iDPC-STEM superconduct