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Characterization of 2 μm band soliton optical comb based on silicon nitride microcavity

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JOURNAL OF INFRARED AND MILLIMETER WAVES 2024年第4期43卷 442-449页

作者： Cheng, Ru-Min Sun, Jia-Hao Wu, Jia-Gui Guo, Deng-Ji Xu, Jiao Yang, Jun-Bo Yan, Pei-Guang Shenzhen Univ Sch Phys & Optoelect Ergineering Shenzhen Key Lab Laser Engn Shenzhen 518060 Peoples R China Southwest Univ Sch Phys Sci & Technol Chongqing 400715 Peoples R China Coll Mechatron & Control Engn Inst Semicond Mfg Res Shenzhen 518060 Peoples R China Natl Univ Def Technol Coll Sci Changsha 410015 Peoples R China

The optical frequency comb (OFC) generation of 2 mu m silicon nitride microcavity is investigated. Dispersion modulation of silicon nitride waveguides is carried out by geometrical design. Appropriate bus waveguide dimensions are selected, and the thermal refraction noise of silicon nitride microcavities at different modulation frequencies is discussed by the thermal absorption theory. The nonlinear Schrodinger equation is used as the basic model to study the evolution of the cavity under different dispersion effects. The numerical results show that silicon nitride is able to observe the hysteretic state transition of the system, i. e. , the relaxation oscillation phenomenon during the transition of the system to the stable domain, more clearly in the 2 mu m band. At the same time, the cavity is able to transition to the steady state soliton faster under the action of higher-order dispersion, which provides a scheme to study the respiratory soliton.

关键词： optical frequency combs dispersion modulation thermorefractive noise breathe soliton FREQUENCY GENERATION SI3N4

F(R) gravity in the early Universe: electroweak phase transition and chameleon mechanism

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Chinese Physics C 2019年第10期43卷 86-98页

作者： Taishi Katsuragawa Shinya Matsuzaki Eibun Senaha institute of Astrophysics Central China Normal UniversityWuhan 430079China Center for Theoretical Physics and College of Physics Jilin UniversityChangchun130012China Center for Theoretical Physics of the Universe Institute for Basic Science (IBS)Daejeon 34051Korea

It is widely believed that the screening mechanism is an essential feature for the modified gravity theory. Although this mechanism has been examined thoroughly in the past decade, their analyses are based on a conventional fluid prescription for the matter-sector configuration. In this paper, we demonstrate a new formulation of the chameleon mechanism in F(R) gravity theory, to shed light on quantum-field theoretical effects on the chameleon mechanism as well as the related scalaron physics, induced by the matter sector. We show a possibility that the chameleon mechanism is absent in the early Universe based on a scale-invariant-extended scenario beyond the standard model of particle physics, in which a realistic electroweak phase transition, yielding the right amount of baryon asymmetry of Universe today, simultaneously breaks the scale invariance in the early Universe. We also briefly discuss the oscillation of the scalaron field and indirect generation of non-tensorial gravitational waves induced by the electroweak phase transition.

关键词： modified gravity beyond standard model thermal field theory

A Stacking-Based Deep Neural Network Approach for Effective Network Anomaly Detection

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Computers, Materials & Continua 2021年第2期66卷 2217-2227页

作者： Lewis Nkenyereye Bayu Adhi Tama Sunghoon Lim Department of Computer and Information Security Sejong UniversitySeoul05006Korea Data science Group Institute for Basic Science(IBS)Daejeon34126Korea Department of Industrial Engineering Ulsan National Institute of Science and TechnologyUlsan44919Korea

An anomaly-based intrusion detection system(A-IDS)provides a critical aspect in a modern computing infrastructure since new types of attacks can be *** prevalently utilizes several machine learning algorithms(ML)for detecting and classifying network *** date,lots of algorithms have been proposed to improve the detection performance of A-IDS,either using individual or ensemble *** particular,ensemble learners have shown remarkable performance over individual learners in many applications,including in cybersecurity ***,most existing works still suffer from unsatisfactory results due to improper ensemble *** aim of this study is to emphasize the effectiveness of stacking ensemble-based model for A-IDS,where deep learning(e.g.,deep neural network[DNN])is used as base learner *** effectiveness of the proposed model and base DNN model are benchmarked empirically in terms of several performance metrics,i.e.,Matthew’s correlation coefficient,accuracy,and false alarm *** results indicate that the proposed model is superior to the base DNN model as well as other existing ML algorithms found in the literature.

关键词： Anomaly detection deep neural network intrusion detection system stacking ensemble

Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moiré superlattices

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Light(science & Applications) 2022年第10期11卷 2523-2529页

作者： Chang-Hwan Yi Hee Chul Park Moon Jip Park Center for Theoretical Physics of Complex Systems Institute for Basic Science(IBS)Daejeon 34126Republic of Korea

The moiré superlattice of misaligned atomic bilayers paves the way for designing a new class of materials with wide *** this work,we propose a photonic analog of the moiré superlattice based on dielectric resonator *** sharp contrast to van der Waals materials with weak interlayer coupling,we realize the strong coupling regime in a moiré superlattice,characterized by cascades of robust flat bands at large ***,we find that these flat bands are characterized by a non-trivial band topology,the origin of which is the moiré pattern of the resonator *** physical manifestation of the flat band topology is a robust one-dimensional conducting channel on edge,protected by the reflection symmetry of the moiré *** explicitly breaking the underlying reflection symmetry on the boundary terminations,we show that the first-order topological edge modes naturally deform into higher-order topological corner *** work pioneers the physics of topological phases in the designable platform of photonic moiré superlattices beyond the weakly coupled regime.

关键词： topological bands coupling

Cloning and identification of a novel human glioma differentiation related gene GDR1

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Chinese science Bulletin 2000年第11期45卷 995-999页

作者： Guangtao Li Hulin Jin Songnian Hu Jian Jin Chun Tu Jiangang Yuan Boqin Qiang Peking Union Med Coll Sch Basic MedNatl Ctr Human Genome Res Chinese Acad Med Sci Inst Basic Med SciNatl Lab Med Mol Biol Beijing 100005 Peoples R China

In order to identify the genes associated with glioblastoma differentiation, some ESTs, expressed differentially in the control cell and the differentiated human glioblastoma cell line BT-325 induced by the all-trans retinoid acid, have been isolated by the method of DDRT-PCR. Of the 46 ESTs sequenced, 19 are from new genes. A full-length 1 535-bp cDNA, termed gene GDR1, has been isolated from the human cDNA library using the probe designed according to one of the novel ESTs, HGBB098. The open reading frame of GDR1 gene encodes a putative protein containing 334 amino acid residues. Blast against the current GenBank DMA and protein sequence database did not reveal significant homology with any known proteins. RT-PCR shows that GDR1 mRNA level increased in the differentiated BT-325 cells after being treated with RA. The different expression patterns of GDR1 mRNA in human tissues have been detected through the multiple tissue Northern blot hybridization.

关键词： human glioma GDR1 RT-PCR.

Coupling and characterization of a Si/SiGe triple quantum dot array with a microwave resonator

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CHINESE PHYSICS B 2024年第9期33卷 139-143页

作者： Jiang, Shun-Li Jiang, Tian-Yi Xu, Yong-Qiang Wu, Rui Hao, Tian-Yue Ye, Shu-Kun Cai, Ran-Ran Wang, Bao-Chuan Li, Hai-Ou Cao, Gang Guo, Guo-Ping Univ sci & Technol China CAS Key Lab Quantum Informat Hefei 230026 Peoples R China Univ sci & Technol China CAS Ctr Excellence Quantum Informat & Quantum Phys Hefei 230026 Peoples R China Origin Quantum Comp Co Ltd Hefei 230088 Peoples R China

Scaling up spin qubits in silicon-based quantum dots is one of the pivotal challenges in achieving large-scale semiconductor quantum computation. To satisfy the connectivity requirements and reduce the lithographic complexity, utilizing the qubit array structure and the circuit quantum electrodynamics (cQED) architecture together is expected to be a feasible scaling scheme. A triple-quantum dot (TQD) coupled with a superconducting resonator is regarded as a basic cell to demonstrate this extension scheme. In this article, we investigate a system consisting of a silicon TQD and a high-impedance TiN coplanar waveguide (CPW) resonator. The TQD can couple to the resonator via the right double-quantum dot (RDQD), which reaches the strong coupling regime with a charge-photon coupling strength of g0/(2 pi) = 175 MHz. Moreover, we illustrate the high tunability of the TQD through the characterization of stability diagrams, quadruple points (QPs), and the quantum cellular automata (QCA) process. Our results contribute to fostering the exploration of silicon-based qubit integration.

关键词： triple-quantum dot strong coupling circuit quantum electrodynamics (cQED) scalable silicon-based cQED architectures SINGLE-ELECTRON SPIN QUBITS SILICON SEMICONDUCTOR CHARGE LOGIC GATE

FINITE-PART INTEGRAL AND BOUNDARY ELEMENT METHOD FOR INTERACTION BETWEEN TWO PARALLEL PLANAR CRACKS IN THREE-DIMENSIONAL FINITE BODIES

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Acta Mechanica Solida Sinica 1998年第2期11卷 95-103页

作者： Wang Aiqin Qin Taiyan Xian Highway Univ Dept Basic Sci Xian 710064 Peoples R China China Agr Univ Dept Basic Sci Beijing 100083 Peoples R China

By using the Somigliana representation and the concepts offinite-part integrals, a set of hypersingular integral equations ofthe interaction between two parallel planar cracks in a three-dimen-sional finite body subjected to arbitrary loads is derived, and thenits numerical method is proposed by the finite-part integral methodcombined with the boundary element method. According to the analytictheory of hypersingular integral equations, the square root models ofdisplacement discontinuities in the elements near the crack front areapplied, and thus the computational precision is raised. Based onthis, the stress intensity factors can be directly ***, the stress intensity factors of sever- al typicalinteraction problems are calculated.

关键词： two parallel planar craclks three-dimensional finite body hypersingularintegral

Facile synthesis of accordion-like porous carbon from waste PET bottles-based MIL-53(Al) and its application for high-performance Zn-ion capacitor

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Green Energy & Environment 2024年第7期9卷 1138-1150页

作者： Jiaxin Li Shuai Zhang Yumeng Hua Yichao Lin Xin Wen Ewa Mijowska Tao Tang Xuecheng Chen Rodney S.Ruoff Faculty of Chemical Technology and Engineering West Pomeranian University of Technology Key State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences School of Safety Engineering China University of Mining and Technology institute of Advanced Electrical Materials Qingdao University of Science and Technology institute for basic science Center for Multiple Dimensional Carbon Materials Department of Chemistry Ulsan National Institute of Science and Technology (UNIST) Department of Materials science and Engineering Ulsan National Institute of Science and Technology (UNIST) School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST)

It is of great scientific and economic value to recycle waste poly（ethylene terephthalate）(PET) into high-value PET-based metal organic frameworks（MOFs） and further convert it into porous carbon for green energy storage applications. In the present study, a facile and costeffective hydrothermal process was developed to direct recycle waste PET bottles into MIL-53（Al） with a 100% conversation, then the MOFderived porous carbon was assembled into electrodes for high-performance supercapacitors. The results indicated that the as-synthesized carbon exhibited high SSA of 1712 m2g-1and unique accordion-like structure with hierarchical porosity. Benefit to these advantageous characters, the assembled three-electrode supercapacitor displayed high specific capacitances of 391 F g-1at the current density of 0.5 A g-1and good rate capability of 73.6% capacitance retention at 20 A g-1in 6 mol L-1KOH electrolyte. Furthermore, the assembled zinc ion capacitor still revealed outstanding capacitance of 335 F g-1at 0.1 A g-1, excellent cycling stability of 92.2% capacitance retention after 10 000 cycles and ultra-high energy density of 150.3 Wh kg-1at power density of 90 W kg-1in 3 mol L-1ZnSO4electrolyte. It is believed that the current work provides a facile and effective strategy to recycle PET waste into high-valuable MOF, and further expands the applications of MOF-derived carbons for high-performance energy storage devices, so it is conducive to both pollution alleviation and sustainable economic development.

关键词： PET Recycling Porous carbon Supercapacitor Energy storage

Cloning of human and mouse GRY-RBP cDNA

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Chinese science Bulletin 2000年第4期45卷 343-350页

作者： Guangwei Du Meihui Pan Yan Zhou Jianhe Chen Hui Yao Jiangang Yuan Boqin Qiang Chinese Acad Med sci Peking Union Med Coll Natl Ctr Human Genome Res Inst Inst Basic Med SciNatl Lab Med Mol Biol Beijing 100005 Peoples R China

After screening human fetal brain cDNA library, a novel human cDNA encoding an RNA-binding protein was cloned and named GRY-RBP. Human GRY-RBP cDNA is 2 932 bp in length, and encodes a protein of 623 amino acids with a deduced molecular mass of 69.6 ku. Human GRY-RBP contains three RNA recognition motifs (RRMs) and a glycine (G), tyrosin (Y)-rich C-terminus. Computer searches with sequence database revealed its moderate homology with RRMs of many RRM RNA-binding proteins. in this study, the full coding region and partial non-coding region of mouse GRY-RBP cDNA were amplified by PCR using mouse brain cDNA library as template. Three transcripts of Gry-rbp are expressed in ali tissues as shown by Northern blot, but the amounts in heart, planceta and skeletal muscle are considerably higher than those in other tissues.

关键词： RRM RNA-binding protein GRY-RBP tissue expression.