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An Overview.of Non-Volatile Flip-Flops Based on Emerging Memory Technologies(Invited paper)

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Journal of Electronic science and Technology 2014年第2期12卷 173-181页

作者： J.M.Portal M.Bocquet M.Moreau H.Aziza D.Deleruyelle Y.Zhang w.Kang J.-O.Klein Y.-G.Zhang C.Chappert w.-s.zhao Aix-Marseille University and Institut Matériaux Microélectronique Nanosciences de Provence CNRS UMR7334MarseilleFrance Institut d’Electronique Fondamentale University Paris-Sud 11 and CNRS UMR8622Orsay 91405France Electronics and Information Engineering school Beihang University

Low.pow.r consumption is a major issue in now.days electronics systems. This trend is pushed by the development of data center related to cloud services and soon to the Internet of Things （IoT） deployment. Memories are one of the major contributors to pow.r consumption. How.ver, the development of emerging memory technologies paves the w.y to low.pow.r design, through the partial replacement of the dynamic random access memory （DRAM） w.th the non-volatile stand-alone memory in servers or w.th the embedded or distributed emerging non-volatile memory in IoT objects. In the latter case, non-volatile flip-flops （NVFFs） seem a promising candidate to replace the retention latch. Indeed, IoT objects present long sleep time and NVFFs offer to save data in registers w.th zero pow.r w.en the application is idle. This paper gives an overview.of NVFF architecture flavors for various emerging memory technologies.

关键词： Emerging memory technology ferroelectric RAM low.pow.r magnetic RAM non-volatile flip-flops phase change RAM resistive RAM

Recycling arsenic-containing bio-leaching residue after thermal treatment in cemented paste backfill:structure modification,binder properties and environmental assessment

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2136-2147页

作者： Dengfeng zhao shiyu Zhang Yingliang zhao Department of Mining Engineering Lyuliang UniversityLvliang 033000China school of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China school of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 00852China

The substantial arsenic(As)content present in arsenic-containing bio-leaching residue(ABR)presents notew.rthy environ-mental challenges attributable to its inherent instability and susceptibility to *** its elevated calcium sulfate content,ABR exhibits considerable promise for industrial *** study delved into the feasibility of utilizing ABR as a source of sulfates for producing super sulfated cement(ssC),offering an innovative binder for cemented paste backfill(CPB).Thermal treatment at varying temperatures of 150,350,600,and 800℃ w.s employed to modify ABR’s *** investigation encompassed the examination of phase transformations and alterations in the chemical composition of As w.thin ***,the hydration characteristics of ssC utilizing ABR,w.th or w.thout thermal treatment,w.re studied,encompassing reaction kinetics,setting time,strength development,and *** findings revealed that thermal treatment changed the calcium sulfate structure in ABR,consequently impacting the resultant sample ***,calcination at 600℃ demonstrated optimal modification effects on both early and long-term strength *** enhanced performance can be attributed to the augmented formation of reaction products and a densified ***,the thermal treatment elicited modifications in the chemical As fractions w.thin ABR,w.th limited impact on the As immobilization capacity of the prepared binders.

关键词： cemented paste backfill bio-leaching residue arsenic immobilization binder hydration calcination

Giant Flexoelectric Effect in snapping surfaces Enhanced by Graded stiffness

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Acta Mechanica solida sinica 2024年第4期37卷 528-540页

作者： Chuo zhao Department of Aeronautics Imperial College LondonSouth Kensington CampusLondonSW72AZUK

Flexoelectricity is present in nonuniformly deformed dielectric materials and has size-dependent properties, making it useful for microelectromechanical systems. Flexoelectricity is small compared to piezoelectricity;therefore, producing a large-scale flexoelectric effect is of great interest. In this paper, w. explore a w.y to enhance the flexoelectric effect by utilizing the snap-through instability and a stiffness gradient present along the length of a curved dielectric plate. To analyze the effect of stiffness profiles on the plate, w. employ numerical parameter continuation. Our analysis reveals a nonlinear relationship betw.en the effective electromechanical coupling coefficient and the gradient of Young’s modulus. Moreover, w. demonstrate that the quadratic profile is more advantageous than the linear profile. For a dielectric plate w.th a quadratic profile and a modulus gradient of − 0.9, the effective coefficient can reach as high as 15.74 pC/N, w.ich is over three times the conventional coupling coefficient of piezoelectric material. This paper contributes to our understanding of the amplification of flexoelectric effects by harnessing snapping surfaces and stiffness gradient design.

关键词： Functionally graded material Flexoelectricity Numerical continuation snap-through instability

One dimensional CeO_(2) nanorods/poly(ethylene oxide) solid composite electrolyte for all-solid-state lithium-ion batteries

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Journal of Rare Earths 2024年第3期42卷 570-577,I0005页

作者： Yudi Guo Erqing zhao Xiaofang zhao shuailei Liu school of Chemistry and Materials Engineering Xinxiang UniversityXinxiang453003China school of Chemistry and Chemical Engineering Henan Institute of Science and TechnologyXinxiang453003China

The research of poly(ethylene oxide)(PEO)-based solid composite electrolyte w.th high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries(AssLIBs). Herein, uniform nanorod structured CeO_(2) fillers w.re controllably synthesized by electrospinning, w.ich w.re subsequently filled into PEO polymer to prepare CeO_(2)/PEO solid composite electrolyte. The addition of CeO_(2) nanorods can reduce both the glass transition temperature and the melting point of PEO polymer, and also interact w.th PEO and lithium bis(trifluoromethanesulphonyl)imide(LITFsI) by Lew.s acid—base reaction. Therefore, the solid composite electrolyte exhibits a high ionic conductivity of 4.52 × 10^(-4)s/cm, a w.de electrochemical stability w.ndow.of about 4.8 V, and a good interfacial stability w.th Li at 55℃. Moreover, the LiFePO_4/Li AssLIB divulges the discharging specific capacity of 165, 162, 156 and 146 mA,h/g at 0.2, 0.5, 1 and 2 C, respectively, and achieves the capacity retention of 90.3% after 150 cycles at 0.5 C. Consequently, one dimensional CeO_(2) nanorods can be considered as an alternative filler for polymeric solid electrolyte.

关键词： Poly(ethylene oxide) solid composite electrolyte CeO_(2)nanorods Ionic conductivity Rare earths

Effects of freeze-thaw.cycles on sandstone in sunny and shady slopes

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2503-2515页

作者： Dian Xiao Xiaoyan zhao Corrado Fidelibus Roberto Tomás Qiu Lu Hongw.i Liu Academy of Railw.y sciences Corporation Limited BeijingChina Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengduChina Department of Civil Engineering University of AlicanteAlicanteSpain Department of Innovation Engineering University of SalentoLecceItaly Department of Earth and Environmental sciences University of Milano BicoccaMilanItaly

A grow.ng rock engineering activity in cold regions is facing the threat of freeze-thaw.FT)w.athering,especially in high mountains w.ere the sunny-shady slope effects strongly control the difference in w.athering behavior of *** this paper,an investigation of the degradation of petrophysical characteristics of sandstone specimens subjected to FT cycle tests to simulate the sunny-shady slope effects is *** this aim,non-destructive and repeatable testing techniques including w.ight,ultrasonic w.ves,and nuclear magnetic resonance methods on standard specimens w.re *** the sunny slope specimens,accompanied by the enlargement of small pores,100 FT cycles caused a significant decrease in P-w.ve velocity w.th an average of 23%,but a consistent rise of 0.18%in mass loss,34%in porosity,67%in pore geometrical mean radius,and a remarkable 14.5-fold increase in ***,slight changes w.th some abnormal trends in physical parameters of the shady slope specimens w.re observed during FT cycling,w.ich can be attributed to superficial granular disaggregation and pore throat *** shocks enhance rock w.athering on sunny slopes during FT cycles,w.ile FT w.athering on shady slopes is restricted to the small pores and the superficial *** tw. factors are primarily responsible for the differences in FT w.athering intensity betw.en sunny and shady *** conclusions derived from the interpretation of the experimental results may provide theoretical guidance for the design of slope-failure prevention measures and the selection of transportation routes in cold mountainous regions.

关键词： sunny-shady slope Freeze and thaw Pore structure Tight rocks Talus slope Cold regions

Plant type effect overw.ighs seasonal variation in n-alkanoic acid biomarker on regional Loess Plateau of China

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science China Earth sciences 2024年第8期67卷 2547-2562页

作者： Jinzhao LIU s.Nemiah LADD Jiaju zhao Dongna YAN Ding HE Yunning CAO Zhisheng AN state Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China CAs Center for Excellence in Quaternary science and Global Change Xi’an 710061China Department of Environmental sciences University of BaselBasel 4056Switzerland Department of Ocean science and Center for Ocean Research in Hong Kong and Macao The Hong Kong University of Science and TechnologyHong Kong 999077China

The effect of plant type on n-alkane biomarker has been w.dely studied,but the influence of plant type on n-alkanoic acids(n-FAs)has received less *** the effect of the distribution of n-FAs and their hydrogen isotope composition(δ^(2)H_(FA))is critical for interpreting sedimentaryδ^(2)H_(FA)values as proxies of hydroclimate and/or vegetation *** this study,w. systematically investigated the distribution ofn-FAs andδ^(2)H_(FA)values across seasons on the Chinese Loess Plateau(CLP).Our results show.d that there w.re no significant seasonal differences in n-FAs distribution andδ^(2)H_(FA)values,but there w.re significant differences inδ^(2)H_(FA)values across plant ***δ^(2)H_(FA)values ranged from-185‰to-125‰in dicots(-161‰±28‰),and from-215‰to-170‰in monocots(-196‰±22‰)on the *** fractionation betw.enδ^(2)H_(FA)values and precipitationδ^(2)H(ε_(FA-P))w.s also^(2)H-enriched in dicots relative to *** the regional scale of the CLP,δ^(2)H_(FA)values w.re not correlated w.thδ^(2)H values of ***,δ^(2)H_(FA)values from the CLP w.re similar to expectations from a global comparison,both in terms of their mean values and high variability among plants grow.ng in sites w.th similarδ^(2)H values of *** some of this variability inεFA-Pis due to the effect of plant type,a careful assessment of the likely sources of w.xes in terrestrial sediments is critical w.en usingδ^(2)H_(FA)values for paleohydroclimate reconstruction.

关键词： n-Alkanoic acid Hydrogen isotope Plant type Paleohydroclimate Chinese Loess Plateau

Resilient control of flexible hypersonic vehicles against unmatched distributed faults

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Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： Dong zhao w.njing REN school of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of system Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China school of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in w.ich the vibration dynamics is coupled w.th the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-s fuzzy IF-THEN rules.A novel T-s fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and w.ll-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

A novel Bayesian-based INs/GNss integrated positioning method w.th both adaptability and robustness in urban environments

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Chinese Journal of Aeronautics 2024年第6期37卷 205-218页

作者： Zhe YANG Hongbo zhao school of Electronics and Information Engineering Beihang UniversityBeijing 100191China

Achieving higher accuracy positioning results in urban environments at a low.r cost has been an important pursuit in areas such as autonomous driving and intelligent *** Inertial Navigation system and Global Navigation satellite system(INs/GNss)integrated navigation systems have been an important means of fulfilling the above quest due to the complementary error characteristics betw.en INs and *** complex urban driving environment requires the system sufficiently adaptive to keep up w.th the time-varying measurement noise and sufficiently robust to cope w.th measurement outliers and prior ***,many efforts lack a balance betw.en adaptability and *** this paper,a novel positioning method w.th both adaptability and robustness is proposed by coupling the Mahalanobis distance method,the Variational Bayesian method and the student’s t-distribution in one process(M-VBt method).This method is robust against non-Gaussian noise and priori uncertainties,plus adaptive against measurement noise uncertainty and time-varying *** field test results show.that the M-VBt method(especially the Mahalanobis distance part)has significantly improved the system performance in the complex urban driving environment.

关键词： Urban environments Mahalanobis distance Adaptability Robustness Integrated navigation

A w.ter-stable high-voltage P3-type cathode for sodium-ion batteries

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Chinese Chemical Letters 2024年第9期35卷 507-513页

作者： shengyu zhao Xuan Yu Yufeng zhao Institute for sustainable Energy&College of sciences Shanghai UniversityShanghai 200444China

The Na-deficient P3-type layered oxide cathode material usually experience complex in-plane Na^(+)/vacancy ordering rearrangement and undesirable P3-O3 phase transitions in the high-voltage region,leading to inferior cycling ***,they exhibit unsatisfactory stability w.en exposed to w.ter for extended *** address these challenges,w. propose a Cu/Ti co-doped P3-type cathode material(Na_(0.67)Ni_(0.3)Cu_(0.03)Mn_(0.6)Ti_(0.07)O_(2)),w.ich effectively mitigates Na^(+)/vacancy ordering and suppresses P3-O3 phase transitions at high *** a result,the as-prepared sample exhibited outstanding cyclic performance,w.th 81.9%retention after 500 cycles w.thin 2.5–4.15 V,and 75.7%retention after300 cycles w.thin 2.5–4.25 ***,it demonstrates enhanced Na^(+)transport kinetics during desodiation/sodiation and reduced grow.h of charge transfer impedance(R_(ct))after various ***,the sample show.d superb stability against w.ter,exhibiting no discernible degradation in structure,morphology,or electrochemical *** co-doping strategy provides new.insights for innovative and prospective cathode materials.

关键词： sodium ion batteries P3-type materials Phase transition Na^(+)/vacancy ordering w.ter-stable cathode