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Unusual Anomalous Hall Effect in a Co2MnSi/MnGa/Pt Trilayer

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Chinese Physics Letters 2020年第7期37卷 96-99页

作者： Shan li Jun lu lian-Jun Wen Dong Pan Hai-Long Wang Da-Hai Wei Jian-Hua zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering&CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Beijing Academy of Quantum Information Science Beijing 100193China

An ultra-thin Co2MnSi(0.5 nm)/Mn Ga(1.5 nm) bilayer capped with Pt(5 nm) has been successfully grown by molecular-beam *** is a potential candidate of synthetic antiferromagnets due to antiferromagnetic coupling between Co2MnSi and MnGa,which is a promising skyrmion-racetrack-memory medium without skyrmion Hall effect after capping with a Pt *** humps in transverse Hall resistance loops are clearly observed in the temperature range from 260 to 400 *** anomaly is generally attributed to topological Hall effect,but other than that,we prove that non-uniform rotation of magnetic moments in the bilayer with magnetic field sweeping is also a possible mechanism contributed to the unusual hump.

关键词： layer. usual MnGa

Theoretical studies of adsorption property on Ir_4/MgO and Ir_4/γ-Al_2O_3

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Journal of Natural Gas Chemistry 2011年第6期20卷 595-602页

作者： Xianyong Pang Duichun li Zizhang Wei Jinmo zhao Guichang Wang College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China Tianjin Enviromental Engineering Assessment Center Tianjin 300191 China Department of Chemistry and the Central of Theory and Computational Nankai University Tianjin 300071 China College of Chemistry and Chemical Engineering Shanxi Datong University Datong 037009 Shanxi China

The adsorption properties of atomic and molecular species on Ir4/MgO and Ir4/γ-Al2O3 have been systematically studied by means of planewave density functional theory（DFT）calculations using the periodic boundary *** binding energies of these species were ordered as follows：H2O〈C2H4〈H〈OH〈S〈N〈O〈*** adsorption energies of adatoms on Ir4/MgO were larger than those on Ir4/γ-Al2O3 except hydrogen atom,but were in reverse for the molecules *** addition,the difference of adsorption energies on MgO and γ-Al2O3 supports has been elucidated by analyzing the electronic properties.A detailed investigation on state density clarifies the nature of the magnitude of adsorption *** calculated results are consistent well with the available experimental and theoretical results.

关键词： Ir4/MgO Ir4/γ-Al2O3 adsorption property DFT calculation support effect

Post-disaster spatial reconstruction from the perspective of a rural settlement niche in the upper reaches of the Minjiang River

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Journal of Mountain Science 2024年第5期21卷 1630-1646页

作者： liU Yanguo WANG li ZOU Qiang li Jingji lu Yafeng li lin XU Binni WANG lihui Tianfu Institute of Research and Innovation Southwest University of Science and TechnologyChengdu 610299China Mianyang Science and Technology City Division the National Remote Sensing Center of ChinaSouthwest University of Science and TechnologyMianyang 621010China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610299China State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection(Chengdu University of Technology) Chengdu 610059China Tianfu New Area Park City Construction Bureau Chengdu Municipal Bureau of Planning and Nature ResourcesChengdu 610218China

Post-disaster recovery and reconstruction provide an effective way to reduce the disaster vulnerability of, and promote leapfrog development in, an affected area. To date, studies that have used administrative boundaries to investigate the reconstruction of settlement space have not been able to clearly define the real boundaries of land use changes or quantify the degree of response to the ‘Build-Back-Better’ initiative, and have lacked any consideration of the fourth reconstruction stage–development period(10 years). This study constructed a mountain settlement niche and analyzed the characteristics, spatial reconstruction, and drivers of rural settlements during 2009–2019 in the upper reaches of the Minjiang River, southwest China. The results showed the following:(1) Natural factors were the basis for the formation and development of mountain settlement niches. The scale of the settlement niche and its land use structure depended on the physical geography features and the ethnic farming and grazing traditions. The settlement niche provided a realistic boundary for the spatial reconstruction.(2) The layout of residential land around cropland was the common feature of the mountain settlement niche. Of all the land use types, the roads and rural residential lands showed the most change over the 10 years;13,860 residential patches increased in size and 4,742 patches were abandoned.(3) The area of orchards, planted to reconstruct the economy in the mountains, increased by nearly 2.5 times.(4) Collapses, landslides, and debris flow disasters and the ecological red line influenced the spatial reconstruction. While the main focus of post-disaster recovery is spatial reconstruction, initiatives should include economic and spiritual recovery, and should also achieve sustainable development of the region.

关键词： Rural settlements Spatial reconstruction Settlement niche Post-Wenchuan Earthquake Reconstruction Southwest China

Flexible Monitoring,Diagnosis,and Therapy by Microneedles with Versatile Materials and Devices toward Multifunction Scope

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Research 2023年第4期2023卷 793-820页

作者： Shuo Wang Mengmeng zhao Yibo Yan Peng li Wei Huang Frontiers Science Center for Flexible Electronics(FSCFE) Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi'anChina

Microneedles(MNs)have drawn rising attention owing to their merits of convenience,noninvasiveness,flexible applicability,painless microchannels with boosted metabolism,and precisely tailored multifunction *** can be modified to serve as novel transdermal drug delivery,which conventionally confront with the penetration barrier caused by skin stratum *** micrometer-sized needles create channels through stratum corneum,enabling efficient drug delivery to the dermis for gratifying ***,incorporating photosensitizer or photothermal agents into MNs can conduct photodynamic or photothermal therapy,***,health monitoring and medical detection by MN sensors can extract information from skin interstitial fluid and other biochemical/electronic ***,this review discloses a novel monitoring,diagnostic,and therapeutic pattern by MNs,with elaborate discussion about the classified formation of MNs together with various applications and inherent ***,multifunction development and outlook from biomedical/nanotechnology/photoelectric/devices/informatics to multidisciplinary applications are *** intelligent MNs enable logic encoding of diverse monitoring and treatment pathways to extract signals,optimize the therapy efficacy,real-time monitoring,remote control,and drug screening,and take instant treatment.

关键词： stratum sized enable

Coupling-induced spectral splitting for plasmonic sensing with ultra-high figure of merit

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Chinese Physics B 2018年第11期27卷 327-331页

作者： Hua lu Yi-Cun Fan Si-Qing Dai Dong Mao Fa-Jun Xiao Peng li Jian-lin zhao MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology. School of Science Northwestern Polytechnical University. Xi＇an 710072 China

We investigate a kind of spectral splitting effect in a plasmonic multilayer system, which consists of stacked Al_2 O_3 and SiO_2 layers, a thin metal film, and a dielectric prism substrate. The results illustrate that an obvious peak appears in the center of the surface plasmon resonance（SPR）-induced reflection spectral dip in the structure with the SiO_2/Al_2 O_3/SiO_2 layers. This spectral splitting response can be regarded as an electromagnetically induced transparency（EIT） like effect,which is attributed to the coupling and interference between the SPR on the metal film and guided-mode resonance（GMR）in the Al_2 O_3 layer. The theoretical calculations agree well with the numerical simulations. It is also found that the reflection spectrum will be further split by the introduction of another Al_2 O_3 layer into the multilayer structure. The reintroduced GMR in the Al_2 O_3 layer changes the coupling and interference process between the SPR and GMR field, giving rise to the generation of ultra-narrow reflection dip. Especially, the spectral splitting can facilitate the realization of plasmonic sensors with ultra-high figure of merit（583）, which is about 5 times larger than that of traditional SPR sensors. These results will provide a new avenue to the light field manipulation and optical functionalities, especially biochemical and environmental sensing.

关键词： surface plasmon polaritons multilayer optical sensors

Research on the Magnetic Field of NGC 7793 P13 and Other Confirmed Pulsating Ultraluminous X-Ray Sources

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Research in Astronomy and Astrophysics 2022年第11期22卷 207-213页

作者： Fan-liang Meng Yuan-Yue Pan zhao-Sheng li Key Laboratory of Stars and Interstellar Medium Xiangtan UniversityXiangtan 411105China

A pulsating ultraluminous X-ray source(PULX)is a new kind of pulsar(PSR)whose characteristics are different from all known neutron *** magnetic field of PULX is suspected to be the main reason to support its supper Eddington luminosity of *** 7793 P13,which is the second confirmed PULX,can be easily studied due to its nearby position and isolation from other sources in its host *** this paper,we calculate its magnetic field to be∼1.0×10^(12) G based on the continued observations from 2016 to *** magnetic field evolution of NGC 7793 P13 is analyzed,which shows that the source has spent about 10^(4) yr for the field decaying from the simulated initial strength 4.0×10^(14) G to the present *** case of an assumed constant accretion and the limitation of the companion mass,it will be a recycled PSR whose magnetic field is ∼10^(9) G and spin period is a few hundred *** estimate the field strength of the other confirmed PULXs and find main range is 10^(13)-10^(14) *** positions of the magnetic field and spin period are around or below the *** is because these PULXs are in the binary systems and are with the spin-up rate that are 2-3 orders higher than the normal binary *** suggest that PULXs are the accreting magnetars whose multi-pole strong magnetic field can support the supper Eddington *** would be helpful for studying the evolution of the magnetars,the formation of the binary PSRs above the Eddington spin-up line,and the millisecond PSRs with the magnetic field stronger than ∼10^(9) G.

关键词： stars:neutronll(stars:)pulsars stars:evolution stars:magnetic field accretion accretion disks X-rays:bursts stars:magnetars

Identifying candidate genes involved in trichome formation on carrot stems by transcriptome profiling and resequencing

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Journal of Integrative Agriculture 2022年第12期21卷 3589-3599页

作者： WU Zhe YANG Xuan zhao Yu-xuan JIA li College of Horticulture Shanxi Agricultural UniversityTaigu 030801P.R.China Key Laboratory of Genetic Improvement and Ecophysiology of Horticultural Crop of Anhui Province Institute of HorticultureAnhui Academy of Agricultural SciencesHefei 230001P.R.China

Trichomes are specialized structures developed from epidermal cells and can protect plants against biotic and abiotic *** cover carrots during the generative ***,the morphology of the carrot trichomes and candidate genes controlling the formation of trichomes are still *** study found that carrot trichomes were nonglandular and unbranched hairs distributed on the stem,leaf,petiole,pedicel,and seed of *** analysis of a trichome mutant with sparse and short trichomes(sst)and a wild type(wt)with long and dense trichomes on carrot stems was conducted.A total of 15396 genes containing nonsynonymous mutations in sst were obtained,including 42 trichomerelated *** also analyzed the transcriptome of the trichomes on secondary branches when these secondary branches were 10 cm long between wt and sst and obtained 6576 differentially expressed genes(DEGs),including 24 trichome-related ***-PCR validation exhibited three significantly up-regulated DEGs,20 significantly downregulated,and one with no *** considered both the resequencing and transcriptome sequencing analyses and found that 12 trichome-related genes that were grouped into five transcription factor families containing nonsynonymous mutations and significantly down-regulated in ***,these genes are potentially promising candidate genes whose nonsynonymous mutations and down-regulation may result in scarce and short trichomes mutation on carrot stems in sst.

关键词： carrot trichome resequencing transcriptome candidate genes

living/controlled polymerization of vinylpyridines into sequence-regulated copolymers by Lewis pair

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Science China Chemistry 2024年第8期67卷 2737-2746页

作者： Qiankun Ding Wuchao zhao Fukuan li Jianghua He Yuetao Zhang Department of State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

The poly(vinylpyridine)(PVP) based(co)polymers are of particular interest in materials science, due to their multifunctionality and diverse applications. So far, there is no report on the sequence-regulated copolymerization of vinylpyridines(VPs) and methacrylate monomer in one-step manner yet. Here we designed and synthesized a series of guanidine phosphines as Lewis base(LB), which is combined with bulky organoaluminium to construct Lewis pairs(LPs) for polymerization of VPs. The living/controlled polymerization of 4-vinylpyridine(4-VP) or 2-vinylpyridine(2-VP) can be accomplished with remarkable efficiency by such Lewis pair polymerization(LPP), furnishing polymers with high molecular weight(up to 288 kg/mol) and narrow molecular weight distribution(as low as 1.17). Mechanistic studies reveal the interaction of LPs and formation of zwitterionic intermediates, providing solid evidences to support the proposed polymerization mechanism. More importantly, by simply adjusting the LA dosage, this LPP strategy realizes the unprecedented control over the sequence regulation of 2-VP-based copolymers from gradient to block in one-step manner, regardless of the monomer ratio, which greatly expands the versatility of the LPP.

关键词： guanidine phosphine Lewis pair polymerization living/controlled polymerization vinyl pyridine sequence regulation

Haptics-equiped interactive PCI simulation for patient-specific surgery training and rehearsing

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Science China(Information Sciences) 2016年第10期59卷 233-238页

作者： Shuai li Qing XIA Aimin HAO Hong QIN Qinping zhao State Key Laboratory of Virtual Reality Technology and Systems Beihang University Department of Computer Science Stony Brook University

Despite the long history of medical simulations, suffering from the patient-specific heterogeneous heart physiological structure and complex intravascular procedures, it is still challenging for patient-specific percutaneous coronary intervention(PCI) surgery simulation. In this paper, we advocate a haptics-equiped interactive prototype system towards PCI surgeons training and patient-specific surgery rehearsing, which can afford trainees the opportunity to approximately experience the entire PCI procedures and customized emergency cases that might occur in common clinical settings. The full simulation covers tissue deformation, catheter and wire simulation, X-ray simulation, haptic feedback, and 3D realistic rendering, which in all give rise to the integrated physical, visual, haptic, and procedural realism. Our system can accommodate various comprehensive operations involved in PCI-related procedures, including feeding wires, releasing stents, injecting contrast medium, simulating X-ray, bleeding, etc. Moreover, our system framework is fully built upon CUDA, and thus can achieve real-time performance even on a common desktop. The high-fidelity, real-time efficiency and stableness of our system show great potentials for its practical applications in clinical training fields.

关键词： percutaneous coronary intervention(PCI) PCI surgery simulation patient-specific surgery rehearsing physically-based modeling haptics