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Strong hopping induced Dzyaloshinskii–Moriya interaction and skyrmions in elemental cobalt

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npj Computational Materials 2019年第1期5卷 708-713页

作者： hu-Bin luo Hong-Bin Zhang JPing Liu Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences315201 NingboChina Department of Materials and Geosciences TU Darmstadt64287 DarmstadtGermany Department of Physics University of Texas at ArlingtonArlingtonTX 76091USA

The Dzyaloshinskii–Moriya interaction(DMI)is well known to favor a chiral rotation of the magnetic moments,which accounts for the emergence of the *** DMI is a combined effect of spin–orbit coupling with broken inversion symmetry in *** of the noncentrosymmetric magnetic materials that bear skyrmions involve nonmagnetic *** work shows that strong DMIs exist in elemental cobalt with a β-Mn-type metastable *** variation of DMI among different cobalt pairs largely follows the variation of hopping magnitude in which p electrons play an important *** the DMIs between different atomic pairs partly cancels with each other,the net interaction is sufficient to result in a left-handed Bloch-type *** dynamics simulation shows that a critical magnetic field of 2.9 T stabilizes skyrmions at 0 K.

关键词： structure cobalt interaction

A skin-integrated device for neck posture monitoring and correction

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Microsystems & Nanoengineering 2023年第6期9卷 221-234页

作者： hu luo Tianhao Jin Yu Zhang Bohao Tian Yuru Zhang Dangxiao Wang State Key Lab of Virtual Reality Technology and Systems and Bejing Advanced Innovation Center for Biomedical Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian District100191 BejingChina School of General Engineering Beihang UniversityNo.37 Xueyuan RoadHaidian DistrictBejingChina Peng Cheng Laboratory Shenzhen 518055China

Cervical spondylosis is a common disease that is often caused by long-term abnormal cervical curvature due to activities such as reading books and using computers or *** paper explores building an untethered and skin-integrated device in an e-skin form factor to monitor and haptically correct neck *** proposed design features a multilayered structure that integrates all flexible electronic circuits and components into a compact skin space while being untethered and skin *** accelerometer in the e-skin attaches to the neck for posture sensing,while four vibration actuators closely touch the neck skin to provide localized vibrotactile stimuli that encode four-direction correction cues of neck flexion±αand lateral bending±β.To ensure the reliability of posture sensing and vibrotactile rendering during neck movement,it is necessary to prevent the e-skin device from shifting ***,a hollow structure-based method is implemented for stably attaching the e-skin to the neck *** validated the e-skin device's sensing precision,skin-conformal compliance,stickiness,stability and effectiveness during the motion of neck postures,including its discrimination of localized four-direction vibrotactile cues.A user study verified the device's performance for sensing and correcting different abnormal neck postures during activities such as using smartphones,reading books,and processing computer *** proposed e-skin device may create opportunities for more convenient cervical spondylosis prevention and rehabilitation.

关键词： correction rendering shifting

Metal-soil interface adhesion in clay clogging during shield tunneling:Theoretical model and experimental validation

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Underground Space 2024年第2期15卷 188-202页

作者： Yong Fang Bin Zhuo Yubo Wang hu luo Junfeng Sun Yuxiang Yao Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China

Clogging is a major geohazards risk in mechanized tunnelling through cohesive *** clogging results from the high adhesion between the clay and *** on the water film theory and Reynolds fluid equation,the interfacial adhesion between metal and soil is simplified in this study as viscous hydrodynamic behavior between *** the influence of capillary force and the viscous force of water film at the interface between metal and soil,a theoretical calculation model of interfacial adhesion between metal and soil is *** influence of water film thickness and separation rate on the interfacial adhesion between metal and soil is qualitatively ***,the adhesion stress between the clay and the metal surface was tested with a pullout test and the influence of moisture content,pullout rates and types of clay minerals on the adhesion stress was ***,the calculation model of adhesion force was compared with the experimental *** calculation model of soil adhesion stress established in this paper can quantitatively describe the relationship between soil adhesion force and moisture content and can also qualitatively reveal the influence mechanism of soil moisture content on adhesion stress.

关键词： EPB clogging Adhesion stress Mechanics model Clays Mechanism analysis Experimental test

Preparation of PMAA-coated Dysprosium Ferrite Ferrofluids and Study on the Superparamagnetism

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Chemical Research in Chinese Universities 2002年第1期18卷 30-33页

作者： Zhu Chuan-zheng SHEN Qin hu Xian-luo ZHANG Jie ZHAO Hong Department of Chemistry East China Normal UniversityShanghai 200062P.R.China

The present paper covers the unprecedented preparation of stable aqueous Dy-ferrite ferrofluids, whereby colloidal Dy_ δ Fe_ 3- δ O_4 ultrafine particles were dispersed by using polymeric surfactant PMAA. The stabilities of the series of the ferrofluids were studied according to the stability indexes. The susceptibility measurements were made with a Farady-type magnetic balance at various temperatures and magnetic field intensities. In terms of Langevin function, the σ versus H/T curves showed that Dy-ferrite ferrofluids exhibited superparamagnetism behavior and the blocking temperatures were in the range from 160 to 200 K. Moreover, the ferrofluids were characterized by means of Infra-red spectroscopy, transmission electron microscopy, X-ray diffraction, and Mssbauer spectroscopy.

关键词： Dy-ferrite ferrofluid Susceptibility Superparamagnetism Stability PMAA

Combined prediction of rockburst based on multiple factors and stacking ensemble algorithm

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Underground Space 2023年第6期13卷 241-261页

作者： hu luo Yong Fang Jianfeng Wang Yubo Wang Hang Liao Tao Yu Zhigang Yao Key Laboratory of Transportation Tunnel Engineering of Ministry of Education Southwest Jiaotong UniversityChengdu 610031China

Rockburst is a kind of common geological disaster in deep tunnel *** has the characteristics of causing great harm and occurring at random locations and *** characteristics seriously affect tunnel construction and threaten the physical and mental health and safety of ***,it is of great significance to study the tendency of rockburst in the early stage of tunnel survey,design and *** present,there is no unified method and selected parameters for rockburst *** view of the large difference of different rockburst criteria and the imbalance of rockburst database categories,this paper presents a two-step rockburst prediction method based on multiple factors and the stacking ensemble *** the influence of rock physical and mechanical parameters,tunnel face conditions and excavation disturbance,multiple rockburst criteria are predicted by integrating multiple machine learning algorithms.A combined prediction model of rockburst criteria is established,and the results of each rockburst criterion index are weighted and combined,with the weight updated using the field rockburst *** dynamic weight is combined with the cloud model to comprehensively evaluate the regional rockburst *** results from applying the model in the Grand Canyon tunnel show that the rockburst prediction method proposed in this paper has better applicability and higher accuracy than the single rockburst criterion.

关键词： Rockburst Stacking ensemble algorithm Combined prediction Cloud model

Effect of Nb-V microalloying on the hot deformation behavior of medium Mn steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 360-368页

作者： Yumeng Wang Qinyi Guo Bin hu Haiwen luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The influence of Nb-V microalloying on the hot deformation behavior and microstructures of medium Mn steel(MMS)was investigated by uniaxial hot compression *** establishing the constitutive equations for simulating the measured flow curves,we successfully constructed deformation activation energy(Q)maps and processing maps for identifying the region of flow *** concluded the following consequences of Nb-V alloying for MMS.(i)The critical strain increases and the increment diminishes with the increasing deformation temperature,suggesting that NbC precipitates more efficiently retard dynamic recrystallization(DRX)in MMS compared with solute Nb.(ii)The deformation activation energy of MMS is significantly increased and even higher than that of some reported high Mn steels,suggesting that its ability to retard DRX is greater than that of the high Mn content.(iii)The hot workability of MMS is improved by narrowing the hot processing window for the unstable flow stress,in which fine recrystallized and coarse unrecrystallized grains are present.

关键词： medium manganese steel niobium-vanadium microalloying flow behavior dynamic recrystallization hot workability

Targeting neuroinflammation in Alzheimer's disease:from mechanisms to clinical applications

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Neural Regeneration Research 2023年第4期18卷 708-715页

作者： Zi-Zhen Si Chen-Jun Zou Xi Mei Xiao-Fang Li hu luo Yao Shen Jun hu Xing-Xing Li Lun Wu Yu Liu Pharmacy Department The Affiliated Hospital of Medical SchoolNingbo UniversityNingboZhejiang ProvinceChina Department of Physiology and Pharmacology School of MedicineNingbo UniversityNingboZhejiang ProvinceChina Department of Geriatric Psychiatry Ningbo Kangning HospitalNingboZhejiang ProvinceChina Key Laboratory Office of Sleep Medicine Ningbo Kangning HospitalNingboZhejiang ProvinceChina Department of Psychology Collage of Teacher EducationNingbo UniversityNingboZhejiang ProvinceChina Department of Preventive Medicine School of MedicineNingbo UniversityNingboZhejiang ProvinceChina

Alzheimer’s disease is characterized by sustained neuroinflammation leading to memory loss and cognitive *** past decade has witnessed tremendous efforts in Alzheimer’s disease research;however,no effective treatment is available to prevent disease *** increasing body of evidence suggests that neuroinflammation plays an important role in Alzheimer’s disease pathogenesis,alongside the classical pathological hallmarks such as misfolded and aggregated proteins(e.g.,amyloid-beta and tau).Firstly,this review summarized the clinical and pathological characteristics of Alzheimer’s ***,we outlined key aspects of glial cell-associated inflammation in Alzheimer’s disease pathogenesis and provided the latest evidence on the roles of microglia and astrocytes in Alzheimer’s disease ***,we revealed the double-edged nature of inflammatory cytokines and inflammasomes in Alzheimer’s *** addition,the potential therapeutic roles of innate immunity and neuroinflammation for Alzheimer’s disease were also discussed through these *** the final section,the remaining key problems according to the current research status were discussed.

关键词： Alzheimer’s disease astrocytes immune signaling inflammatory cytokines microglia neuroinflammation neurotoxicity therapeutic strategies

In Vivo Kinetics and Biodistribution of a Hantaan Virus DNA Vaccine after Intramuscular Injection in Mice

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Virologica Sinica 2010年第3期25卷 177-182页

作者： Si WANG Qing NIE Lan-yan ZHENG Jun hu En-jie luo Department of Medical microbiology and parasitology Preclinical Medical College China Medical University Shenyang 110001 China

To study the kinetics in vivo of a Hantaan virus DNA vaccine, we constructed a fusion DNA vaccine, pEGFP/S, by cloning the S segment of Hantavirus into the vector, pEGFP-C1, which encodes Green fluorescent protein EGFP. In this report, we provide evidence that pEGFP/S was distributed and persistently expressed for more than 60 days in several organs after inoculation. Our findings suggest that the persistent immune responses induced by a Hantaan virus DNA vaccine are likely due to the plasmid pEGFP/S deposited in vivo, which acts as a booster immunization.

关键词： Hantaan virus DNA vaccine Intramuscular injection Immunologic memory Nucleocapsid protein

A functional cathode sodium compensation agent for stable sodium-ion batteries

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Green Energy & Environment 2025年第1期10卷 173-182页

作者： Wei Wu Zhenglin hu Zhengfei Zhao Aoxuan Wang Jiayan luo Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Jiao Tong University Shaoxing Research Institute of Renewable Energy and Molecular Engineering Shaoxing312000China

Hard carbon(HC)is widely used in sodium-ion batteries(SIBs),but its performance has always been limited by lowinitial Coulombic efficiency(ICE)and cycling *** compensation agent is a favorable strategy to make up for the loss of active sodium ions consumed *** it lacks agent that effectively decomposes to increase the active sodium ions as well as regulate carbon defects for decreasing the irreversible sodium ions ***,we propose 1,2-dihydroxybenzene Na salt(NaDB)as a cathode compensation agent with high specific capacity(347.9 mAh g^(-1)),lower desodiation potential(2.4–2.8 V)and high utilization(99%).Meanwhile,its byproduct could functionalize HC with more C]O groups and promote its reversible ***,the presodiation hard carbon(pHC)anode exhibits highly reversible capacity of 204.7 mAh g^(-1) with 98%retention at 5 C rate over 1000 ***,with 5 wt%NaDB initially coated on the Na3V2(PO4)3(NVP)cathode,the capacity retention of NVP t NaDBjHC cell could increase from 22%to 89%after 1000 cycles at 1 C *** work provides a new avenue to improve reversible capacity and cycling performance of SIBs through designing functional cathode compensation agent.

关键词： Hard carbon ICE Cathode compensation agent Reversible capacity Stability