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Compressed Least Squares Algorithm of Continuous-Time Linear Stochastic Regression model Using Sampling Data

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Journal of Systems Science & Complexity 2024年第4期37卷 1488-1506页

作者： XIE Siyu ZHANG Shujun WANG Ziming gan Die School of Aeronautics and Astronautics University of Electronic Science and Technology of ChinaChengdu 611731China China Academy of Aerospace Science and Innovation Beijing 100176China Zhongguancun Laboratory Beijing 100094China

In this paper,the authors consider a sparse parameter estimation problem in continuoustime linear stochastic regression models using sampling *** on the compressed sensing(CS)method,the authors propose a compressed least squares(LS) algorithm to deal with the challenges of parameter *** each sampling time instant,the proposed compressed LS algorithm first compresses the original high-dimensional regressor using a sensing matrix and obtains a low-dimensional LS estimate for the compressed unknown ***,the original high-dimensional sparse unknown parameter is recovered by a reconstruction *** introducing a compressed excitation assumption and employing stochastic Lyapunov function and martingale estimate methods,the authors establish the performance analysis of the compressed LS algorithm under the condition on the sampling time interval without using independence or stationarity conditions on the system *** last,a simulation example is provided to verify the theoretical results by comparing the standard and the compressed LS algorithms for estimating a high-dimensional sparse unknown parameter.

关键词： Compressed excitation condition compressed sensing continuous-time model least squares linear stochastic regression parameter identification sampling data

Stability and performance analysis of the compressed Kalman filter algorithm for sparse stochastic systems

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Science China(Technological Sciences) 2024年第2期67卷 380-394页

作者： LI RongJiang gan Die XIE SiYu LüJinHu Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China Zhongguancun Laboratory Beijing 100049China School of Aeronautics and Astronautics University of Electronic Science and Technology of ChinaChengdu 611731China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

This paper considers the problem of estimating unknown sparse time-varying signals for stochastic dynamic *** deal with the challenges of extensive sparsity,we resort to the compressed sensing method and propose a compressed Kalman filter(KF)*** algorithm first compresses the original high-dimensional sparse regression vector via the sensing matrix and then obtains a KF estimate in the compressed low-dimensional ***,the original high-dimensional sparse signals can be well recovered by a reconstruction *** ensure stability and establish upper bounds on the estimation errors,we introduce a compressed excitation condition without imposing independence or stationarity on the system signal,and therefore suitable for feedback *** further present the performance of the compressed KF ***,we show that the mean square compressed tracking error matrix can be approximately calculated by a linear deterministic difference matrix equation,which can be readily evaluated,analyzed,and ***,a numerical example demonstrates that our algorithm outperforms the standard uncompressed KF algorithm and other compressed algorithms for estimating high-dimensional sparse signals.

关键词： sparse signal compressed sensing Kalman filter algorithm compressed excitation condition stochastic stability tracking performance

Numerical Simulation of the mass movement Process of the 2018 Sedongpu Glacial Debris Flow by Using the Fluid-Solid Coupling method

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Journal of Earth Science 2024年第2期35卷 583-596页

作者： Xing-Yu Long Yu-Xiang Hu Bin-Rui gan Jia-Wen Zhou State Key Laboratory of Hydraulics and mountain River Engineering Sichuan UniversityChengdu610065China College of Water Resource and Hydropower Sichuan UniversityChengdu610065China

In the context of global warming and intensified human activities,glacier instability in plateau regions has increased,and glacier debris flows have become active,which poses a significant threat to the lives and property of people and socioeconomic *** mass movement process of glacier debris flows is extremely complex,so this paper uses the 2018 Sedongpu glacier debris flow event on the Qinghai-Tibet Plateau as an example and applies a numerical simulation method to invert the whole process of mass *** view of the interaction between phases in the process of motion,we use the fluid-solid coupling method to describe the mass *** granular-flow model and drift-flux model are employed in FLOW3D software to study the mass movement process of glacier debris flows and explore their dynamic *** results indicate that the glacier debris flow lasted for 700 s,and the movement process was roughly divided into four stages,including initiation,scraping,surging and deposition;the depositional characteristics calculated by the fluid-solid coupling model are consistent with the actual survey results and have good reliability;strong erosion occurs during the mass movement,the clear volume amplification effect,and the first wave climbs 17.8 m across the *** fluid-solid coupling method can better simulate glacier debris flows in plateau regions,which is helpful for the study of the mechanism and dynamic characteristics of such disasters.

关键词： glacial debris flow Qinghai-Tibet Plateau fluid-solid coupling FLOW3D mass movement depositional characteristics disasters engineering geology

Quantum Spin Exchange Interactions to Accelerate the Redox Kinetics in Li–S Batteries

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Nano-micro Letters 2024年第5期16卷 370-383页

作者： Yu Du Weijie Chen Yu Wang Yue Yu Kai Guo gan Qu Jianan Zhang Key Laboratory of Advanced Energy Catalytic and Functional materials Preparation of Zhengzhou City College of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001People’s Republic of China

Spin-engineering with electrocatalysts have been exploited to suppress the“shuttle effect”in Li–S *** selec-tion,spin-dependent electron mobility and spin potentials in activation barriers can be optimized as quantum spin exchange interactions lead-ing to a significant reduction of the electronic repulsions in the orbitals of ***,we anchor the mgPc molecules on fluorinated carbon nanotubes(mgPc@FCNT),which exhibits the single active mg sites with axial *** to the density functional theory calculations,the electronic spin polarization in mgPc@FCNT not only increases the adsorption energy toward LiPSs intermediates but also facilitates the tunneling process of electron in Li–S *** a result,the mgPc@FCNT provides an initial capacity of 6.1 mAh cm^(-2) even when the high sulfur loading is 4.5 mg cm^(-2),and still maintains 5.1 mAh cm^(-2) after 100 *** work provides a new perspective to extend the main group single-atom catalysts enabling high-performance Li–S batteries.

关键词： metal phthalocyanines Spin polarization Electrocatalysis Li–S batteries

mCP-1 and IL-4 encapsulated hydrogel particles with macrophages enrichment and polarization capabilities for systemic lupus erythematosus treatment

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Nano Research 2024年第9期17卷 8316-8324页

作者： Shengjie Zhu Danqing Huang Qichen Luan Yang Li Jingjing gan Yuanjin Zhao Lingyun Sun Department of Rheumatology and Immunology Nanjing Drum Tower HospitalClinical Medical College of Traditional Chinese and Western MedicineNanjing University of Chinese MedicineNanjing 210096China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China

macrophages play a pivotal role in systemic lupus erythematosus(SLE)*** have been made to develop multifunctional drug delivery systems capable of directing macrophage ***,we present a novel hyaluronic acid methacrylate(HAmA)hydrogel microparticle encapsulating multiple cytokines for SLE remission though enhancing macrophage *** HAmA microparticles loaded with monocyte chemotactic protein-1(mCP-1)and interleukin-4(IL-4)were fabricated by using a microfluidic *** released mCP-1 facilitates the aggregation of inflammatory macrophages,after which IL-4 induces the macrophage phenotype shift from inflammatory m1 to immune-protective m2,thus restoring immune *** have demonstrated in mRL/lpr mice that the hydrogel microparticles could improve their efficacy of intraperitoneal drug delivery,modulate immune function,and attenuate the disease *** results suggest that our proposed microparticles delivery platform has potential clinical value for treating autoimmune diseases.

关键词： microfluidics m2 polarization hydrogel drug delivery systemic lupus erythematosus(SLE)

mIgm-mediated splenic marginal zone B cells targeting of folic acid for immunological evasion

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Acta Pharmaceutica Sinica B 2024年第2期14卷 808-820页

作者： Huan Wang Zhuxuan Jiang Zhiwei Guo gan Luo Tianhao Ding Changyou Zhan Department of Pharmacology School of Basic Medical Sciences&Department of PharmacyShanghai Pudong HospitalFudan UniversityShanghai 200032China Department of Pharmaceutical Sciences School of PharmacyNaval Medical UniversityShanghai 200433China Shanghai Engineering Research Center for Synthetic Immunology Fudan UniversityShanghai 200032China

Folic acid is a fully oxidized synthetic folate with high bioavailability and stability which has been extensively prescribed to prevent congenital *** we revealed the immunosuppressive effect of folic acid by targeting splenic marginal zone B(mZB)*** acid demonstrates avid binding with the Fc domain of immunoglobulin m(Igm),targeting Igm positive mZB cells in vivo to destabilize Igm-B cell receptor(BCR)complex and block immune *** induced anergy of mZB cells by folic acid provides an immunological escaping window for *** conjugation of folic acid with therapeutic proteins and antibodies induces immunological evasion to mitigate the production of anti-drug antibodies,which is a major obstacle to the long-term treatment of biologics by reducing curative effects and/or causing adverse *** acid acts as a safe and effective immunosuppressant via Igm-mediated mZB cells targeting to boost the clinical outcomes of biologics by inhibiting the production of anti-drug antibodies,and also holds the potential to treat other indications that adverse immune responses need to be transiently shut off.

关键词： membrane-bound Igm Anti-drugantibodies Bcell anergy Folic acid marginal zoneBcells Bcell receptor Biologics Targeting

Gradient layered mXene/Fe3O4@CNTs/TOCNF ultrathin nanocomposite paper exhibiting effective electromagnetic shielding and multifunctionality

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Nano Research 2024年第9期17卷 8233-8242页

作者： Zhengkun ma Jingzong He Shilin Liu Xiaoxuan Qie meiheng gan Ruonan Cheng Qilin Wu malcolm Xing State Key Laboratory for modification of Chemical Fibers and Polymer materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China College of Chemistry and Chemical Engineering Donghua UniversityShanghai 201620China Department of mechanical Engineering University of ManitobaWinnipegMB R3T 2N2Canada

As wearable electronic devices are rapidly developing,there is an urgent need for lightweight,flexible,and ultrathin multifunctional electromagnetic interference(EmI)shielding ***,the flexible ultrathin paper that combines efficient shielding and multifunctional integration remains a considerable ***,a novel mXene/Fe_(3)O_(4)@CNTs/TOCNF(mCT,mXene=transition metal carbide/carbonitride,CNTs=carbon nanotubes,TOCNF=TEmPO-oxidized cellulose nanofiber,TEmPO=2,2,6,6-tetramethylpiperidine-1-oxyl radical)nanocomposite paper with a multilayer electromagnetic gradient structure and electromagnetic dual losses was successfully prepared by a simple filtration *** from effective gradient design and adjusting the proportion of TOCNF,the composite paper(only 18μm)exhibits outstanding shielding effectiveness(SE)of 66 dB in the X-band,ultrahigh thickness-specific SE and surface-specific SE values of 3300 dB·mm-1 and 31,428 dB·cm^(2)·g^(-1)***,dehydroxylation treatment improves mCT paper's hydrophobicity,environmental stability,and mechanical strength,expanding its range of ***,the highly efficient Joule heating properties and hydrophobicity provide mCT additional de-icing *** also simulated the electromagnetic shielding effects of mCT composite paper,which was applied in *** study documents an innovative and intriguing material combination,providing a simple and effective manufacturing strategy for developing EmI shielding *** paper is highly suitable for outdoor portable or wearable electronic devices and has significant application potential in humid/severe cold environments.

关键词： cellulose fiber thin papers nanocomposites electromagnetic interference(EmI)shielding

Lotus root-like RuIr alloys with close-packed(0001)branches:Strain-driven performance for acidic water oxidation

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Journal of Energy Chemistry 2024年第5期92卷 579-590页

作者： mingyue Xiao Wanli Xu Rongchao Li Yanhui Sun Jingjun Liu Feng Liu Jun gan Shixin Gao Beijing Key Laboratory of Electrochemical Process and Technology for materials Beijing University of Chemical TechnologyBeijing 100029China Yunnan Precious metals Lab Kunming 650100YunnanChina

Achieving composition tunability and structure editability of nanoalloys with high level strain may be an efficient strategy to remarkably boost catalytic performance toward oxygen evolution reaction(OER)in acidic water ***,lotus root-like RuIr alloys with native micro-strain were constructed by an epitaxial growth of Ru-richened hcp-(0001)branches on Ir-richened fcc-(111)seeds using a polyol thermal synthesis *** resultant Ru_(60)Ir_(40) alloy shows an OER overpotential of 197 mV at 10 mA cm^(-2) and a Tafel slope of 46.59 mV dec^(-1),showing no obvious activity decay for 80 h continuous chronopotentiometry test in 0.5 m H_(2)SO_(4).The related characterizations including X-ray absorption fine structure(XAFS)spectroscopy and density functional theory(DFT)calculations show that that the remarkably improved activity of the lotus root-like alloy can be attributed to the(0001)facet-triggered strain,which can efficiently optimize the electronic band structure of the active metal and the weakening of the chemisorption of oxygen-containing substances to boost OER ***,this work provides a new strategy to designing a class of advanced electrocatalysts with high strain using diverse nanostructures as building materials for carbon-free clean energy conversion systems.

关键词： Rulr alloy Lotusroot-like structure Strain Oxygene volution reaction Activity

Strongly Coupled Ag/Sn-SnO_(2)Nanosheets Toward CO_(2)Electroreduction to Pure HCOOH Solutions at Ampere‑Level Current

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Nano-micro Letters 2024年第3期16卷 212-226页

作者： min Zhang Aihui Cao Yucui Xiang Chaogang Ban Guang Han Junjie Ding Li‑Yong gan Xiaoyuan Zhou College of Physics and Center of Quantum materials and Devices Chongqing UniversityChongqing 401331People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences(CAS)Fuzhou 350002People’s Republic of China College of materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Institute of New Energy Storage materials and Equipment Chongqing 401135People’s Republic of China State Key Laboratory of Coal mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044People’s Republic of China

Electrocatalytic reduction of CO_(2) converts intermittent renewable electricity into value-added liquid products with an enticing prospect,but its practical application is hampered due to the lack of high-performance ***,we elaborately design and develop strongly coupled nanosheets composed of Ag nanoparticles and Sn-SnO_(2) grains,designated as Ag/Sn-SnO_(2) nanosheets(NSs),which possess optimized electronic structure,high electrical conductivity,and more accessible *** a result,such a catalyst exhibits unprecedented catalytic performance toward CO_(2)-to-formate conversion with near-unity faradaic efficiency(≥90%),ultrahigh partial current density(2,000 mA cm^(−2)),and superior long-term stability(200 mA cm^(−2),200 h),surpassing the reported catalysts of CO_(2) electroreduction to ***,in situ attenuated total reflection-infrared spectra combined with theoretical calculations revealed that electron-enriched Sn sites on Ag/Sn-SnO_(2)NSs not only promote the formation of*OCHO and alleviate the energy barriers of*OCHO to*HCOOH,but also impede the desorption of H*.Notably,the Ag/Sn-SnO_(2)NSs as the cathode in a membrane electrode assembly with porous solid electrolyte layer reactor can continuously produce~0.12 m pure HCOOH solution at 100 mA cm^(−2)over 200 *** work may inspire further development of advanced electrocatalysts and innovative device systems for promoting practical application of producing liquid fuels from CO_(2).

关键词： Electrochemical CO_(2)reduction Coupled Ag/Sn-SnO_(2)nanosheets Electronic structure Porous solid electrolyte Pure