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Research status and prospects of the fractal analysis of metal material surfaces and interfaces

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe Cui beijing Advanced innovation center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

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Anomalous displacement reaction for synthesizing above-room-temperature and air-stable vdW ferromagnet PtTe2Ge1/3

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National Science Review 2023年第1期10卷 236-245页

作者： Wenxuan Zhu Cheng Song Qian Wang Hua Bai Siqi Yin Feng Pan Key Laboratory of Advanced Materials School of Materials Science and Engineering Beijing Innovation Center for Future Chips Tsinghua University

Emerging van der Waals（vdW） magnets provide a paradise for the exploration of magnetism in the ultimate two-dimensional（2D） limit,and the construction of integrated spintronic devices,and have become a research frontier in the field of low-dimensional *** date,prototypical vdW magnets based on metals of the first transition series（e.g.V,Cr,Mn and Fe） and chalcogen elements suffer from rapid oxidation restricted by the Hard-Soft-Acid-Base principle,as well as low Curie temperatures（TC）,which has become a generally admitted challenge in 2D ***,starting from air-unstable Cr2Ge2Te6vdW thin flakes,we synthesize Ge-embedded PtTe2(namely PtTe2Ge1/3) with superior air stability,through the displacement reaction in the Cr2Ge2Te6/Pt *** this process,the anomalous substitution of Cr with Pt in the thermal diffusion is inverse to the metal activity order,which can be attributed to the compatibility between soft-acid（Pt） and soft-base（Te） ***,the layered uniform insertion of Ge unbalances Pt-Te bonds and introduces long-range ordered ferromagnetism with perpendicular magnetic anisotropy and a Curie temperature above room *** work demonstrates the anti-metal-activity-order reaction tendency unique in 2D transition-metal magnets and boosts progress towards practical 2D spintronics.

关键词： vdW magnets room-temperature ferromagnetism air stability HSAB PtTe2Ge1/3

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Trends and challenges in the circuit and macro of RRAM-based computing-in-memory systems

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Chip 2022年第1期1卷 19-29页

作者： Song-Tao Wei Bin Gao Dong Wu Jian-Shi Tang He Qian Hua-Qiang Wu School of Integrated Circuits(SIC) Tsinghua UniversityBeijingChina beijing innovation center for future chips(ICFC) Tsinghua UniversityBeijingChina

Conventional von Neumann architecture faces many challenges in dealing with data-intensive artificial intelligence tasks efficiently due to huge amounts of data movement between physically separated data computing and storage *** computing-in-memory(CIM)ar-chitecture implements data processing and storage in the same place,and thus can be much more energy-efficient than state-of-the-art von Neumann *** with their counterparts,resis-tive random-access memory(RRAM)-based CIM systems could consume much less power and area when processing the same amount of *** this paper,we first introduce the principles and challenges re-lated to RRAM-based CIM ***,recent works on the circuit and macro levels of RRAM-CIM systems will be reviewed to highlight the trends and challenges in this field.

关键词： RRAM computing artificial

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Building a Post-Layout Simulation Performance Model with Global Mapping Model Fusion Technique

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Tsinghua Science and Technology 2022年第3期27卷 512-525页

作者： Zhikai Wang Wenfei Hu Sen Yin Ruitao Wang Jian Zhang Yan Wang Zuochang Ye School of Integrated Circuits Tsinghua UniversityBeijing 100084China the beijing innovation center for future chips(ICFC) Beijing National Research Center for Information Science and Technology(NRist)and School of Integrated CircuitsTsinghua UniversityBeijing 100084China

Building a post-layout simulation performance model is essential in closing the loop of analog circuits, but it is a challenging task because of the high-dimensional space and expensive simulation cost. To facilitate efficient modeling, this paper proposes a Global Mapping Model Fusion(GMMF) technique. The key idea of GMMF is to reuse the schematic-level model trained by the Artificial Neural Network(ANN) algorithm, and combine it with few mapping coefficients to build the post-simulation model. Furthermore, as an efficient global optimization algorithm,differential evolution is applied to determine the optimal mapping coefficients with few samples. In GMMF, only a small number of mapping coefficients are unknown, so the number of post-layout samples needed is significantly reduced. To enhance practical utility of the proposed GMMF technique, two specific mapping relations, i.e., linear or weakly no-linear and nonlinear, are carefully considered in this paper. We conduct experiments on two topologies of two-stage operational amplifier and comparator in different commercial processes. All the simulation data for modeling are obtained from a parametric design framework. A more than 5 runtime speedup is achieved over ANN without surrendering any accuracy.

关键词： post-layout simulation performance model Global Mapping Model Fusion(GMMF) Artificial Neural Network(ANN) few mapping coefficients differential evolution

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Measurement of T wave in magnetocardiography using tunnel magnetoresistance sensor

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Chinese Physics B 2023年第2期32卷 5-10页

作者：陆知宏纪帅杨建中 Department of Precision Instrument Tsinghua UniversityBeijing 100084China beijing innovation center for future chips Beijing 100084China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua UniversityBeijing 100084China

Several critical clinical applications of magnetocardiography(MCG)involve its T *** T wave’s accuracy directly affects the diagnostic accuracy of MCG for ischemic heart disease and *** magnetoresistance(TMR)attracts attention as a new MCG measurement ***,the T waves measured by TMR are often drowned in *** accuracy of T waves needs to be discussed to determine the clinical value of MCG measured by *** study uses an improved empirical mode decomposition(EMD)algorithm and averaging to eliminate the noise in the MCG measured by *** MCG signals measured by TMR are compared with MCG measured by the optically pumped magnetometer(OPM)to judge its *** the MCG measured by OPM as a reference,the relative errors in time and amplitude of the T wave measured by TMR are 3.4%and 1.8%,*** is the first demonstration that TMR can accurately measure the time and amplitude of MCG T *** ability to provide reliable T wave data illustrates the significant clinical application value of TMR in MCG measurement.

关键词： magnetocardiography tunnel magnetoresistance optically pumped magnetometer T wave detection

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Mechanism of inflammatory response and therapeutic effects of stem cells in ischemic stroke:current evidence and future perspectives

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Neural Regeneration Research 2025年第1期20卷 67-81页

作者： Yubo Wang Tingli Yuan Tianjie Lyu Ling Zhang Meng Wang Zhiying He Yongjun Wang Zixiao Li Vascular Neurology Department of NeurologyBeijing Tiantan HospitalCapital Medical UniversityBeijingChina China National Clinical Research center for Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Shanghai Engineering Research center of Stem Cells Translational Medicine ShanghaiChina National center for Healthcare Quality Management in Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Institute for Regenerative Medicine Shanghai East HospitalSchool of Life Sciences and TechnologyTongji UniversityShanghaiChina Chinese Institute for Brain Research BeijingChina Research Unit of Artificial Intelligence in Cerebrovascular Disease Chinese Academy of Medical SciencesBeijingChina beijing Engineering Research center of Digital Healthcare for Neurological Diseases BeijingChina

Ischemic stroke is a leading cause of death and disability worldwide,with an increasing trend and tendency for onset at a younger ***,in particular,bears a high burden of stroke *** recent years,the inflammatory response after stroke has become a research hotspot:understanding the role of inflammatory response in tissue damage and repair following ischemic stroke is an important direction for its *** review summarizes several major cells involved in the inflammatory response following ischemic stroke,including microglia,neutrophils,monocytes,lymphocytes,and ***,we have also highlighted the recent progress in various treatments for ischemic stroke,particularly in the field of stem cell ***,understanding the complex interactions between inflammation and ischemic stroke can provide valuable insights for developing treatment strategies and improving patient *** cell therapy may potentially become an important component of ischemic stroke treatment.

关键词： cell therapy immune cell inflammatory ischemic stroke stem cell

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Multi-Mode Bus Coupling Architecture of Superconducting Quantum Processor

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Chinese Physics Letters 2023年第1期40卷 1-8页

作者：赵昌昊何永成耿霄何楷泳戴根婷刘建设陈炜 Laboratory of Superconducting Quantum Information Processing School of Integrated CircuitsTsinghua UniversityBeijing 100084China beijing National Research center for Information Science and Technology Beijing 100084China beijing innovation center for future chips Tsinghua UniversityBeijing 100084China

Resonators in circuit quantum electrodynamics systems naturally carry multiple modes, which may have non-negligible influence on qubit parameters and device performance. While new theories and techniques are under investigation to deal with the multi-mode effects in circuit quantum electrodynamics systems, researchers have proposed novel engineering designs featuring multi-mode resonators to achieve enhanced functionalities of superconducting quantum processors. Here, we propose multi-mode bus coupling architecture, in which superconducting qubits are coupled to multiple bus resonators to gain larger coupling strength. Applications of multi-mode bus couplers can be helpful for improving i SWAP gate fidelity and gate speed beyond the limit of single-mode scenario. The proposed multi-mode bus coupling architecture is compatible with a scalable variation of the traditional bus coupling architecture. It opens up new possibilities for realization of scalable superconducting quantum computation with circuit quantum electrodynamics systems.

关键词： quantum coupling negligible

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A survey of autoencoder-based recommender systems

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Frontiers of Computer Science 2020年第2期14卷 430-450页

作者： Guijuan ZHANG Yang LIU Xiaoning JIN beijing Advanced innovation center for future Internet Technology Beijing University of TechnologyBeijing 100124China

In the past decade,recommender systems have been widely used to provide users with personalized products and ***,most traditional recommender systems are still facing a challenge in dealing with the huge volume,complexity,and dynamics of *** tackle this challenge,many studies have been conducted to improve recommender system by integrating deep learning *** an unsupervised deep learning method,autoencoder has been widely used for its excellent performance in data dimensionality reduction,feature extraction,and data ***,recent researches have shown the high efficiency of autoencoder in information retrieval and recommendation *** autoencoder on recommender systems would improve the quality of recommendations due to its better understanding of users,demands and characteristics of *** paper reviews the recent researches on autoencoder-based recommender *** differences between autoencoder-based recommender systems and traditional recommender systems are presented in this *** last,some potential research directions of autoencoder-based recommender systems are discussed.

关键词： recommender system autoencoder deep learning data mining

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Adaptive Controller Placement in Software Defined Wireless Networks

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China Communications 2019年第11期16卷 81-92页

作者： Feixiang Li Xiaobin Xu Xiao Han Shengxin Gao Yupeng Wang beijing Advanced innovation center for future Internet Technology Beijing University of Technology

Controller placement problem(CPP)is a critical issue in software defined wireless networks(SDWN).Due to the limited power of wireless devices,CPP is facing the challenge of energy efficiency in ***,the related research on CPP in SDWN hasn’t modeled the energy consumption of controllers so *** prolong the lifetime of SDWN and improve the practicability of research,we rebuilt a CPP model considering the minimal transmitted power of *** adaptive controller placement algorithm(ACPA)is proposed with the following two ***,data field method is adopted to determine sub-networks for different network ***,for each sub-network we adopt an exhaustive method to find the optimal location which meets the minimal average transmitted power to place *** with the other algorithms,the effectiveness and efficiency of the proposed scheme are validated through simulation.

关键词： computer application technology adaptive controller placement algorithm data field method controller placement problem

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Simulations of superconducting quantum gates by digital flux tuner for qubits

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Chinese Physics B 2024年第7期33卷 210-222页

作者：耿霄何楷泳刘建设陈炜 Laboratory of Superconducting Quantum Information Processing School of Integrated CircuitsTsinghua UniversityBeijing 100084China beijing innovation center for future chips Tsinghua UniversityBeijing 100084China beijing National Research center for Information Science and Technology Beijing 100084China26

The interconnection bottleneck caused by limitations of cable number, inner space and cooling power of dilution refrigerators has been an outstanding challenge for building scalable superconducting quantum computers with the increasing number of qubits in quantum processors. To surmount such an obstacle, it is desirable to integrate qubits with quantum–classical interface(QCI) circuits based on rapid single flux quantum(RSFQ) circuits. In this work, a digital flux tuner for qubits(DFTQ) is proposed for manipulating flux of qubits as a crucial part of the interface circuit. A schematic diagram of the DFTQ is presented, consisting of a coarse tuning unit and a fine-tuning unit for providing magnetic flux with different precision to qubits. The method of using DFTQ to provide flux for gate operations is discussed from the optimization of circuit design and input signal. To verify the effectiveness of the method, simulations of a single DFTQ and quantum gates including a Z gate and an iSWAP gate with DFTQs are performed for flux-tunable transmons. The quantum process tomography corresponding to the two gates is also carried out to analyze the sources of gate error. The results of tomography show that the gate fidelities independent of the initial states of the Z gate and the iSWAP gate are 99.935% and 99.676%,respectively. With DFTQs inside, the QCI would be a powerful tool for building large-scale quantum computers.

关键词： quantum computation superconducting electronics quantum control

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