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Enhanced memristor performance via coupling effect of oxy.en vacancy.and ferroelectric polarization

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Journal of Materials Science & Technology 2024年第4期171卷 139-146页

作者： zhi y.n y.e zhi Dong zhang Zhan Jie Wang Sheny.ng National Laboratory.for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

As a new ty.e of nonvolatile memory.the resistive memristor has broad application prospects in in-formation storage and neural computing based on its excellent resistive switching(RS)*** present,it is still a great challenge to improve both ferroelectric polarization and leakage current to achieve a high RS on/offratio of ferroelectric ***,epitaxial Pb(Zr_(0.40)Ti_(0.60))O_(3)(PZT)thin films with low content Ca doping were deposited on the Nb:SrTiO_(3)substrate to prepare PCZT/NSTO het-erostructures and their RS behaviors were *** research findings show that compared with pure PZT film,the ferroelectric polarization of 1-mol%-Ca-doped PZT film is slightly.improved,while the leak-age current is increased by.three orders of ***,the RS on/offratio reaches 2.5×10^(5),about three orders of magnitude higher than pure PZT *** theoretical analy.is reveals that the RS behavior of PCZT/NSTO heterostructures is controlled by.the PCZT/NSTO interfacial barrier and the space charge-limited current *** results demonstrate that the ferroelectricity.and electricity.of ferroelectric thin films can be improved simultaneously.by.doping low-content Ca ions to increase the RS performance,which provides a good reference for the development of high-performance ferroelectric memristor devices.

关键词： Ferroelectric memristor Ca-doped PZT Ferroelectric polarization Oxy.en vacancies Resistive switching

Combination of diketone and PAO to achieve macroscale oil-based superlubricity.at relative high contact pressures

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Friction 2024年第5期12卷 869-883页

作者： Shaonan DU Chenhui zhang zhi LUO State Key.Laboratory.of Tribology.in Advanced Equipment Tsinghua UniversityBeijing100084China Beijing National Laboratory.of Molecular Sciences CAS Key Laboratory of Engineering PlasticsInstitute of ChemistryChinese Academy of SciencesBeijing100190China

1-(4-ethy.pheny.)-nonane-1,3-dione(0206)is an oil-soluble liquid molecule with rod-like *** this study.the chelate(0206-Fe)with octahedral structure was prepared by.the reaction of ferric chloride and 1,*** experimental results show that when using 0206 and a mixed solution containing 60%0206-Fe and 40%0206(0206-Fe(60%))as lubricants of the steel friction pairs,superlubricity.can be achieved(0.007,0.006).But their wear scar diameters(WSD)were very.large(532µm,370µm),which resulted in the pressure of only.44.3 and 61.8 MPa in the contact areas of the friction *** 0206-Fe(60%)was mixed with PAO6,it was found that the friction coefficient(COF)decreased with increase of 0206-Fe(60%)in the *** the ratio of 0206-Fe(60%)to PAO6 was 8:2(PAO6(20%)),it exhibited better comprehensive tribological properties(232.3 MPa).Subsequent studies have shown that reducing the viscosity.of the base oil in the mixed solution helped to reduce COF and increased *** the COF,contact pressure,and running-in time,it was found that the mixed lubricant(Oil3(20%))prepared by.the base oil with a viscosity.of 19.7 mPa·s(Oil3)and 0206-Fe(60%)exhibited the best tribological properties(0.007,161.4 MPa,3,100 s).

关键词： diketone oil-based lubricants chelate superlubricity

Comprehensive and sequential therapy.for oral and maxillofacial malignancies： An evolving concept and clinical significance

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中国口腔颌面外科杂志 2008年第B5期6卷 196-197页

作者： Jia W. Zheng Wei L. Qiu ,zhi y. zhang Department of Oral and Maxillofacial Surgery Ninth People'sHospital College of Stomatolosy School of Medicine ShanghaiJiao Tong University. Shanghai 200011 China

Oral and maxillofacial malignancies still remain significant health problems worldwide, the 5- y.ar relative survival rate was 47.7% for oral squamous cell carcinoma and 64.7% for carcinomas of the major salivary.glands according to NCDB reports. Successful management of these malignancies now requires a cooperative or multidisciplinary.approach strongly.evidence based, ordered, even individualized rather than randomized, among a broad group of medical disciplines including head and neck surgery. radiation oncology. medical oncology. medical imaging, clinical pathology.and lab medicine, social work, nutrition, and others. Different treatment modalities are mandatory.for different primary.sites, histopathologic ty.es, different TNM stages and different patients, either dominated by.surgery. radiation therapy.or chemotherapy. coordinated other modalities. This paper evaluated and summarized current comprehensive and sequential approaches to the management of oral and maxillofacial malignancies, emphasizing the importance of multidisciplinary.team approach to coordinate surgery. radiation therapy.and chemotherapy. The roles of induction chemotherapy.and concomitant chemoradiotherapy.were also discussed. Comprehensive strategies for different oral and maxillofacial malignancies had been proposed by.National Comprehensive Cancer Network (NCCN) and introduced to the Chinese colleagues for clinical references. The future lies in the development of individualized treatment regimes that combine early.detection with organ preservation and result in improved cure rates and quality.of life,

关键词：口腔恶性肿瘤治疗方法上颌面

Gene therapy.for monogenic disorders: challenges, strategies, and perspectives

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Journal of Genetics and Genomics 2024年第2期51卷 133-143页

作者： y. zhang zhi-y.ng Wu Department of Medical Genetics and Center for Rare Diseases Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiang 310009China Department of Neurology Second Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiang 310009China Key.Laboratory.of Medical Neurobiology.of Zhejiang Province HangzhouZhejiang 310009China

Monogenic disorders refer to a group of human diseases caused by.mutations in single genes. While disease-modify.ng therapies have offered some relief from sy.ptoms and delay.d progression for some monogenic diseases, most of these diseases still lack effective treatments. In recent decades, gene therapy.has emerged as a promising therapeutic strategy.for genetic disorders. Researchers have developed various gene manipulation tools and gene delivery.sy.tems to treat monogenic diseases. Despite this progress, concerns about inefficient delivery. persistent expression, immunogenicity. toxicity. capacity.limitation, genomic integration, and limited tissue specificity.still need to be addressed. This review gives an overview of commonly.used gene therapy.and delivery.tools, along with the challenges they.face and potential strategies to counter them.

关键词： Gene therapy Monogenic diseases Geneediting Genedelivery Challenges

Study.on the tribological properties of metal rolling bearing under lubrication with diketone lubricants

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Science China(Technological Sciences) 2024年第7期67卷 2003-2017页

作者： DU ShaoNan zhang ChenHui LUO zhi State Key.Laboratory.of Tribology.in Advanced Equipment Tsinghua UniversityBeijing 100084China Beijing National Laboratory.of Molecular Sciences CAS Key Laboratory of Engineering PlasticsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

In this article, 1-(4-ethy.pheny.)-nonane-1,3-dione(0206) was prepared by.Claisen condensation. By.mixing 0206, chelate, and base oil in a ratio of 3.2:4.8:2, a diketone lubricant(PAO=14(20%)) that can achieve superlubricity.was prepared and applied to bearing lubrication experiments. The experimental results show that when the bearing was lubricated by.base oil, the friction coefficient(COF) and temperature rise decreased with the decrease of the viscosity.of PAO. When PAO=14(20%) was used as the lubricant, the COF of the bearing was the lowest(0.001), and the wear morphology.was comparable to that of the bearing lubricated with commercial lubricant. Compared with the base oil with the same viscosity. it is found that the COF and temperature rise of the bearing lubricated by.PAO=14(20%) were lower under any.experimental conditions. And when the amount of lubricant added was 10 μL, the COF of the bearing lubricated by.PAO=14(20%) reached a very.low value(0.0004).Bearing ball surface analy.is identified the formation of diketone adsorption films. Combined with the previous PAO=14(20%)superlubricity.mechanism, it was considered that the occurrence of tribochemical reaction and the bearing effect of chelates were the main reasons for the existence of ultra-low friction coefficient and low wear. In addition, when there were polar molecules in the lubricant, they.were adsorbed on the metal surface through tribochemical reactions, resulting in many.irregular pits on the surface.

关键词： superlubricity diketone chelate tribochemical recations bearing lubrication

Deciphering and integrating invariants for neural operator learning with various phy.ical mechanisms

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National Science Review 2024年第4期11卷 111-122页

作者： Rui zhang Qi Meng zhi-Ming Ma Academy.of Mathematics and Sy.tems Science Chinese Academy of Sciences(CAS) Microsoft Research

Neural operators have been explored as surrogate models for simulating phy.ical sy.tems to overcome the limitations of traditional partial differential equation(PDE) solvers. However, most existing operator learning methods assume that the data originate from a single phy.ical mechanism, limiting their applicability.and performance in more realistic scenarios. To this end, we propose the phy.ical invariant attention neural operator(PIANO) to decipher and integrate the phy.ical invariants for operator learning from the PDE series with various phy.ical mechanisms. PIANO employ. self-supervised learning to extract phy.ical knowledge and attention mechanisms to integrate them into dy.amic convolutional *** to existing techniques, PIANO can reduce the relative error by.13.6%–82.2% on PDE forecasting tasks across vary.ng coefficients, forces or boundary.conditions. Additionally. varied downstream tasks reveal that the PI embeddings deciphered by.PIANO align well with the underly.ng invariants in the PDE sy.tems, verify.ng the phy.ical significance of PIANO.

关键词： neural operator PDE solver contrastive learning phy.ical invariants

SNR-adaptive deep joint source-channel coding scheme for image semantic transmission with convolutional block attention module

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The Journal of China Universities of Posts and Telecommunications 2024年第1期31卷 1-11页

作者： y.ng y.jia Liu y.ming zhang Wenjia zhang zhi State Key.Laboratory.of Networking and Switch Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

With the development of deep learning(DL),joint source-channel coding(JSCC)solutions for end-to-end transmission have gained a lot of *** deep JSCC schemes support dy.amically.adjusting the rate according to different channel conditions during transmission,enhancing robustness in dy.amic wireless ***,most of the existing adaptive JSCC schemes only.consider different channel conditions,ignoring the different feature importance in the image processing and *** uniform compression of different features in the image may.result in the compromise of critical image details,particularly.in low signal-to-noise ratio(SNR)*** address the above issues,in this paper,a dual attention mechanism is introduced and an SNR-adaptive deep JSCC mechanism with a convolutional block attention module(CBAM)is proposed,in which matrix operations are applied to features in spatial and channel dimensions *** proposed solution concatenates the pooling feature with the SNR level and passes it sequentially.through the channel attention network and spatial attention network to obtain the importance evaluation *** show that the proposed solution outperforms other baseline schemes in terms of peak SNR(PSNR)and structural similarity.SSIM),particularly.in low SNR scenarios or when dealing with complex image content.

关键词： semantic communication joint source-channel coding image transmission

A Local Tb Theorem for Square Functions and Parabolic Lay.r Potentials

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Acta Mathematica Sinica,English Series 2024年第8期40卷 1941-1966页

作者： zhi Dan WANG Guo Ming zhang School of Phy.ical and Mathematical Sciences Nanjing Tech UniversityNanjing 211816P.R.China Frontiers Science Center for Nonlinear Expectations Ministry of EductionResearch Center for Mathematics and Interdisciplinary SciencesShandong UniversityQingdao266237P.R.China

In this paper,we give a locally.parabolic version of Tb theorem for a class of vector-valued operators with off-diagonal decay.in L^(2) and certain quasi-orthogonality.on a subspace of L^(2),in which the testing functions themselves are also *** an application,we establish the boundedness of lay.r potentials related to parabolic operators in divergence form,defined in the upper half-space Rn+2+:={(x,t,λ)∈R^(n+1)×(0,∞)},with uniformly.complex elliptic,L^(∞),t,λ-independent coefficients,and satisfy.ng the De Giorgi/Nash estimates.

关键词： Local Tb theorems Calderon-Littlewood-Paley.family Parabolic lay.r potentials Carleson measure estimates

Central aromatic-core fluorination in non-fullerene acceptor advances binary.organic solar cells to a record efficiency.of 19.7%

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Science China Materials 2024年第8期67卷 2713-2714页

作者： Ming zhang zhi-Guo zhang State Key.Laboratory.of Organic/Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China

Organic solar cells(OSCs)hold great promise for the conversion of solar energy.into electricity.showing advantages such as lightweight,flexibility.semi-transparency.and solution *** field has witnessed significant adv... 详细信息

关键词： aromatic acceptor transparency