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Mechanical Modeling and Analy.is of Stability.Deterioration of Production w.ll During Marine Hy.rate Depressurization Production

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China Ocean Engineering 2024年第2期38卷 338-351页

作者： SUN Huan-zhao CHANG y.an-jiang SUN Bao-jiang w.NG Kang CHEN guo-ming LI Hao DAI y.ng-guo Centre for Offshore Engineering and Safety.Technology China University of Petroleum(East China)Qingdao 266580China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Jiangsu Shuguang Oil Tools Co. LtdTaizhou 225532China

Different from oil and gas production,hy.rate reservoirs are shallow.and unconsolidated,w.ose mechanical properties deteriorate w.th hy.rate ***,the formations w.ll undergo significant subsidence during depressurization,w.ich w.ll destroy.the original force state of the production ***,existing research on the stability.of oil and gas production w.lls assumes the formation to be stable,and lacks consideration of the force exerted on the hy.rate production w.ll by.formation subsidence caused by.hy.rate decomposition during *** fill this gap,this paper proposes an analy.ical method for the dy.amic evolution of the stability.of hy.rate production w.ll considering the effects of hy.rate *** on the mechanical model of the production w.ll,the basis for stability.analy.is has been proposed.A multi-field coupling model of the force state of the production w.ll considering the effect of hy.rate decomposition and formation subsidence is established,and a solver is *** analy.ical approach is verified by.its good agreement w.th the results from the numerical method.A case study.found that the decomposition of hy.rate w.ll increase the pulling-dow. force and reduce the supporting force,w.ich is the main reason for the stability.*** higher the initial hy.rate saturation,the larger the reservoir thickness,and the low.r the production pressure,the w.rse the stability.or even *** w.rk can provide a theoretical reference for the stability.maintaining of the production w.ll.

关键词： natural gas hy.rate production w.ll depressurization production formation deformation stability.deterioration

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Spontaneous Infection and Periodic Evolving of Domain in a Diffusive SIS Epidemic Model

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 164-191页

作者： Qiang w.n guo-qiang Ren Bin Liu School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan430074China Hubei Key.Laboratory.of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan430074China

In this paper, w. consider a susceptible-infective-susceptible(SIS) reaction-diffusion epidemic model w.th spontaneous infection and logistic source in a periodically.evolving domain. Using the iterative technique,the uniform boundedness of solution is established. In addition, the spatial-temporal risk index R0(ρ) depending on the domain evolution rate ρ(t) as w.ll as its analy.ical properties are discussed. The monotonicity.of R0(ρ)w.th respect to the diffusion coefficients of the infected dI, the spontaneous infection rate η(ρ(t)y. and interval length L is investigated under appropriate conditions. Further, the existence and asy.ptotic behavior of periodic endemic equilibria are explored by.upper and low.r solution method. Finally. some numerical simulations are presented to illustrate our analy.ical results. Our results provide valuable information for disease control and prevention.

关键词： diffusive SIS model spontaneous infection periodically.evolving domain periodic endemic equilibrium

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Accurate and efficient floor localization w.th scalable spiking graph neural netw.rks

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Satellite Navigation 2024年第1期5卷 191-206页

作者： Fuqiang Gu Fangming guo Fangw.n y. Xianlei Long Chao Chen Kai Liu Xuke Hu Jianga Shang Songtao guo College of Computer Science Chongqing UniversityChongqingChina Department of Precision Instrument Tsinghua UniversityBeijingChina Institute of Data Science German Aerospace Center(DLR)JenaGermany School of Computer Science China University of GeosciencesWuhanChina

Floor localization is crucial for various applications such as emergency.response and rescue,indoor positioning,and recommender *** existing floor localization sy.tems have many.draw.acks,like low.accuracy.poor scalability.and high computational *** this paper,w. first frame the problem of floor localization as one of learning node embeddings to predict the floor label of a ***,w. introduce FloorLocator,a deep learning-based method for floor localization that integrates efficient spiking neural netw.rks w.th pow.rful graph neural *** approach offers high accuracy.easy.scalability.to new.buildings,and computational *** results on using several public datasets demonstrate that FloorLocator outperforms state-of-the-art ***,in building B0,FloorLocator achieved recognition accuracy.of 95.9%,exceeding state-of-the-art methods by.at least 10%.In building B1,it reached an accuracy.of 82.1%,surpassing the latest methods by.at least 4%.These results indicate FloorLocator’s superiority.in multi-floor building environment localization.

关键词： Indoor positioning Deep learning Floor localization Spiking neural netw.rks Graph neural netw.rks

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Machine learning model based on non-convex penalized huberized-SVM

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Journal of Electronic Science and Technology 2024年第1期22卷 81-94页

作者： Peng w.ng Ji guo Lin-Feng Li School of Finance and Economics Xizang Minzu UniversityXianyang712082China Research Center for Quality.Development of Xizang Special Industries Xianyang712082China School of Computer Science and Technology Xinjiang UniversityUrumqi830017China

The support vector machine(SVM)is a classical machine learning *** the hinge loss and least absolute shrinkage and selection operator(LASSO)penalty.are usually.used in traditional ***,the hinge loss is not differentiable,and the LASSO penalty.does not have the Oracle *** this paper,the huberized loss is combined w.th non-convex penalties to obtain a model that has the advantages of both the computational simplicity.and the Oracle property.contributing to higher accuracy.than traditional *** is experimentally.demonstrated that the tw. non-convex huberized-SVM methods,smoothly.clipped absolute deviation huberized-SVM(SCAD-HSVM)and minimax concave penalty.huberized-SVM(MCP-HSVM),outperform the traditional SVM method in terms of the prediction accuracy.and classifier *** are also superior in terms of variable selection,especially.w.en there is a high linear correlation betw.en the *** they.are applied to the prediction of listed companies,the variables that can affect and predict financial distress are accurately.filtered *** all the indicators,the indicators per share have the greatest influence w.ile those of solvency.have the w.akest *** companies can assess the financial situation w.th the indicators screened by.our algorithm and make an early.w.rning of their possible financial distress in advance w.th higher precision.

关键词： Huberized loss Machine learning Non-convex penalties Support vector machine(SVM)

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The centrosy.metric to non-centrosy.metric transformation induced by.alkaline-earth cations producing infrared nonlinear optical AeMn_(6)Ga_(6)S_(16)(Ae=Ca,Sr)

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Science China Chemistry 2024年第9期67卷 2941-2948页

作者： y.ng-Ping Zhang Shao-Min Pei w.n-Fa Chen Bin-w.n Liu Xiao-Ming Jiang guo-Cong guo State Key.Laboratory.of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology.Innovation Laboratory.for Optoelectronic Information of China Fuzhou 350108China School of Phy.ical Science and Technology Shanghai Tech UniversityShanghai 201210China

Non-centrosy.metric(NCS)structure is an indispensable prerequisite for second-order nonlinear optical(NLO)***,the mainstream approach for designing new.NCS structures still relies on chemical substitution,necessitating an urgent infusion of fresh *** this w.rk,tw. isomorphic sulfides AeMn_(6)Ga_(6)S_(16)(Ae=Ca,1;Sr,2)are afforded by.modify.ng the skeleton of centrosy.metric(CS)Mn_(2)Ga_(2)S_(5) via introducing strong electropositive alkaline-earth ***,the incorporation of Ca^(2+)/Sr^(2+)cations allow. the elementary.MnGaS_(9)]_(∞)chains to reconfigure into bumpy.MnS_(6)]-[GaS_(4)]lay.rs in a new.engagement manner,thus enabling the conversion from CS to NCS *** modifications cause not only.strong second-harmonic generation(SHG)responses(~1.5×benchmark AgGaS_(2)@1,700 nm),but also significantly.feasible bandgaps(2.60-2.64 e V)compared to the sulfide Mn_(2)Ga_(2)S_(5)(1.36 e V),w.ich ultimately.facilitate ultrahigh laser-induced damage thresholds(4.4-6.6×AgGaS_(2)@1,064 nm for compounds 1 and 2).The present study.offers an ingenious approach for the transformation of CS to NCS structure.

关键词： second-harmonic generation non-centrosy.metrical structure NLO functional motif solid-state method

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Tw.-Dimensional Graphitic Carbon-Nitride (g-C3N4)-Coated LiNi0.8Co0.1Mn0.1O2 Cathodes for High-Energy.Density.and Long-Life Lithium Batteries

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ENERGy.& ENVIRONMENTAL MATERIALS 2024年第6期7卷 140-149页

作者： Duan, Zhenliang Zhai, Pengbo Zhao, Ning guo, Xiangxin Qingdao Univ Coll Phys Qingdao 266071 Peoples R China Qingdao Univ Coll Mat Sci & Engn Qingdao 266071 Peoples R China Xixi Octagon City Tianmushan Lab Hangzhou 310023 Peoples R China

High-capacity.nickel-rich lay.red oxides are promising cathode materials for high-energy.density.lithium batteries. How.ver, the poor structural stability.and severe side reactions at the electrode/electroly.e interface result in unsatisfactory.cy.le performance. Herein, the thin lay.r of tw.-dimensional (2D) graphitic carbon-nitride (g-C3N4) is uniformly.coated on the LiNi0.8Co0.1Mn0.1O2 (denoted as NCM811@CN) using a facile chemical vaporization-assisted sy.thesis method. As an ideal protective lay.r, the g-C3N4 lay.r effectively.avoids direct contact betw.en the NCM811 cathode and the electroly.e, preventing harmful side reactions and inhibiting secondary.cry.tal cracking. Moreover, the unique nanopore structure and abundant nitrogen vacancy.edges in g-C3N4 facilitate the adsorption and diffusion of lithium ions, w.ich enhances the lithium deintercalation/intercalation kinetics of the NCM811 cathode. As a result, the NCM811@CN-3w.% cathode exhibits 161.3 mAh g(-1) and capacity.retention of 84.6% at 0.5 C and 55 degrees C after 400 cy.les and 95.7 mAh g(-1) at 10 C, w.ich is greatly.superior to the uncoated NCM811 (i.e. 129.3 mAh g(-1) and capacity.retention of 67.4% at 0.5 C and 55 degrees C after 220 cy.les and 28.8 mAh g(-1) at 10 C). The improved cy.le performance of the NCM811@CN-3w.% cathode is also applicable to solid-liquid-hy.rid cells composed of PVDF:LLZTO electroly.e membranes, w.ich show.163.8 mAh g(-1) and the capacity.retention of 88.1% at 0.1 C and 30 degrees C after 200 cy.les and 95.3 mAh g(-1) at 1 C.

关键词： cathode materials g-C3N4 coating LiNi0.8Co0.1Mn0.1O2 lithium batteries PVDF:LLZTO electroly.e membranes ELECTROCHEMICAL PERFORMANCE ION

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Tailoring of a robust asy.metric aramid nanofibers/MXene aerogel film for enhanced infrared thermal camouflage and Joule heating performances

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Nano Research 2024年第3期17卷 1990-1998页

作者： w.nbin Dang w.i guo w.nting Chen Qiuy. Zhang Key.Laboratory.of Special Functional and Smart Poly.er Materials of Ministry.of Industry.and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

The development of infrared(IR)surveillance technology.has led to a grow.ng interest in thermal ***,the trade-off relationship betw.en low.IR-emissivity.and thermal insulation hinders the advance of thermal camouflage ***,guided by.multi-phy.ics simulation,w. show.a design of asy.metric aramid nanofibers/MXene(ANF/MXene)aerogel film that realizes high-efficient thermal camouflage *** rationale is that the asy.metric structure contains a thermal-insulation three-dimensional(3D)netw.rk part to prevent effective heat transfer and a low.IR-emissivity.~0.3)dense surface lay.r to suppress radiative heat *** is remarkable that the sy.ergy.mechanism in the topology.structure contributes to over 40%reduction of target radiation ***,the tailored asy.metric ANF/MXene aerogel film also enables sound mechanical properties such as a y.ung’s modulus of 44.4 MPa and a tensile strength of 1.3 MPa,superior to most aerogel *** also exhibits great Joule heating performances including low.driving voltage(4 V),fast thermal response(y.further enabling its versatile thermal camouflage *** w.rk offers an innovative design concept to configure multifunctional structures for next-generation thermal management applications.

关键词： asy.metric aerogel film low.infrared(IR)-emissivity thermal insulation IR thermal camouflage Joule heating performance

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Experimental and numerical demonstration of hierarchical time-delay.reservoir computing based on cascaded VCSELs w.th feedback and multiple injections

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Science China(Information Sciences) 2024年第2期67卷 279-290页

作者： Xingxing guo Shuiy.ng XIANG Xingy. CAO Biling GU State Key.Laboratory.of Integrated Service Netw.rks Xidian University State Key.Discipline Laboratory.of w.de Bandgap Semiconductor Technology School of MicroelectronicsXidian University

In this paper, w. propose and demonstrate experimentally.and numerically.a hierarchical timedelay.optical reservoir computing(RC) sy.tem based on cascaded vertical-cavity.surface-emitting lasers(VCSELs) w.th feedback and multiple injections. The prediction performance characteristics of the hierarchical time-delay.RC sy.tem based on cascaded VCSELs under different reservoir lay.rs are ***, the prediction performance of the hierarchical time-delay.RC sy.tem is first improved and saturates as the number of reservoir lay.rs increases. Besides, the impacts of key.factors on predicting the hierarchical time-delay.RC sy.tem are also analy.ed in detail experimentally.and numerically. This proposed hierarchical time-delay.RC sy.tem based on VCSELs is useful for the further development of RC sy.tems and may.be beneficial to improve the ability.of RC sy.tems to solve more complex problems.

关键词： vertical-cavity.surface-emitting laser reservoir computing neuromorphic photonics time-delay.sy.tem information processing

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Applications of genetic code expansion technology.in eukary.tes

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Protein & Cell 2024年第5期15卷 331-363页

作者： Qiao-ru guo y. J.Cao State Key.Laboratory.of Chemical Oncogenomic Guangdong Provincial Key Laboratory of Chemical GenomicsPeking University Shenzhen Graduate SchoolShenzhen 518055China Institute of Chemical Biology Shenzhen Bay LaboratoryShenzhen 518132China

Unnatural amino acids(UAAs)have gained significant attention in protein engineering and drug development ow.ng to their ability.to introduce new.chemical functionalities to *** eukary.tes,genetic code expansion(GCE)enables the incorporation of UAAs and facilitates posttranscriptional modification(PTM),w.ich is not feasible in prokary.tic *** is also a pow.rful tool for cell or animal imaging,the monitoring of protein interactions in target cells,drug development,and sw.tch ***,there is keen interest in utilizing GCE in eukary.tic *** review.provides an overview.of the application of GCE in eukary.tic sy.tems and discusses current challenges that need to be addressed.

关键词： genetic code expansion unnatural amino acid eukary.tes basic research therapeutic applications

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Dual-salt poly.tetrahy.rofuran) electroly.e enables quasi-solid-state lithium metal batteries to operate at -30 ℃

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Journal of Energy.Chemistry 2024年第9期96卷 456-463页

作者： Zhiy.ng Li Zhuo Li Rui y. Xin guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074HubeiChina The State Key.Laboratory.of Refractories and Metallurgy.and Institute of Advanced Materials and Nanotechnology Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The stable operation of solid-state lithium metal batteries at low.temperatures is plagued by.severe restrictions from inferior electroly.e-electrode interface compatibility.and increased energy.barrier for Li^(+)***,w. prepare a dual-salt poly.tetrahy.rofuran)-based electroly.e consisting of lithium hexafluorophosphate and lithium difluoro(oxalato)borate(LiDFOB).The Li-salt anions(DFOB−)not only.accelerate the ring-opening poly.erization of tetrahy.rofuran,but also promote the formation of highly.ion-conductive and sustainable interphases on Li metal anodes w.thout sacrificing the Li^(+)conductivity.of electroly.es,w.ich is favorable for Li^(+)transport kinetics at low.*** of this poly.er electroly.e in Li||LiFePO_(4)cells show.82.3%capacity.retention over 1000 cy.les at 30℃and endow.stable discharge capacity.at−30℃.Remarkably.the Li||LiFePO4 cells retain 52%of their room-temperature capacity.at−20℃and 0.1 *** rational design of dual-salt poly.er-based electroly.es may.provide a new.perspective for the stable operation of quasi-solid-state batteries at low.temperatures.

关键词： Poly.tetrahy.rofuran) Dual-salt electroly.e Solidel ectroly.e interphase Low.temperature operation Quasi-solid-state battery

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