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Continuous Stress Annealing Enables Ultralow-Loss Fe-Based Amorphous Alloys With Superior Magnetic Softness for Industrial Manufacturing 认领 引用
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作者 Zhi-Jun Guo Jun Li +8 位作者 Jin-Hong Fu Ji-Feng Zhou Yan-Zhou Fan Xiao-Xuan Yang Ai-Na He Ya-Qiang Dong Qi-Kui Man Qiang Luo Bao-Long Shen 《Rare Metals》 SCIE EI CAS CSCD 2026年第3期868-881,共14页
Fe-based amorphous alloys are attractive soft magnetic materials for next-generation power electronics,yet simultaneously achieving high saturation magnetic flux density(Bs),low coercivity(Hc),and low core loss under ... Fe-based amorphous alloys are attractive soft magnetic materials for next-generation power electronics,yet simultaneously achieving high saturation magnetic flux density(Bs),low coercivity(Hc),and low core loss under scalable processing conditions remains challenging.Here,a composition-stress coupling strategy combining moderate Co substitution with optimized continuous stress annealing(CSA)is proposed to enhance magnetic performance and manufacturability.The optimized Fe81.5-xCoxSi3.7B14.5C0.3(x=1)alloy is designed and exhibits outstanding properties,including low Hc of 0.92 A m-1,high Bs of 1.65 T,ultralow core loss(P10/50)of 0.031 W kg-1at 1.0 T and 50 Hz,and an effective permeability(μe)of 12,200 at 1 A m-1and 1 kHz.Compared with commercial Metglas 2605SA1,Hc and P10/50 are reduced by 46%and 40%,respectively,whereas Bs is enhanced.Multiscale experiments and micromagnetic simulations reveal that optimal Co content and CSA induce mediumrange atomic ordering and magnetoelastic coupling,generating robust uniaxial magnetic anisotropy and coherent three-dimensional magnetization.The CSA process offers a controllable,uniform,and energy-efficient route suitable for large-scale industrial production. 展开更多
关键词 continuous stress annealing Fe-based amorphous soft magnetic alloys magnetic anisotropy magnetic domain evolution
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Structural Modulation of Magnetic Softness in Fe‐Based Amorphous Alloys via Pulse Current Training 认领 引用
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作者 Shumin Ye Zida Zhang +11 位作者 Rie Umetsu Huaping Ding Xiong Liang Yuanfei Cai Yan Zhang Yuqiang Yan Zhenduo Wu Jiang Ma Xing Tong Haibo Ke Hai‐Yang Bai Wei‐Hua Wang 《Rare Metals》 SCIE EI CAS CSCD 2026年第6期808-818,共11页
Fe‐based amorphous alloys,despite their intrinsically low magnetocrystalline anisotropy,suffer from quasi‐dislocation dipoles and localized stress fields that impede domain‐wall motion and increase coercivity.Here,... Fe‐based amorphous alloys,despite their intrinsically low magnetocrystalline anisotropy,suffer from quasi‐dislocation dipoles and localized stress fields that impede domain‐wall motion and increase coercivity.Here,we introduce pulse current training(PCT)as an energy‐efficient technique to overcome these limitations in a Fe76Si9B10P5ribbon.As quenched ribbons exhibit a coercivity Hc~10.6 A m−1and the optimized infrared annealing reduced Hc~2 A m−1with a saturation magnetization Ms~162 emu g−1.By applying controlled square‐wave current pulses(J=7000 A cm−2,Tw:Tp=1:2,Tp=0.06 s)over 18-50 cycles,PCT further reduces Hc to below 1 A m−1and increases Ms to 179 emu g−1.Within a moderate‐cycle window,the ribbons maintain sufficient bendability for a practical core.Ultra‐rapid thermal annealing performed as a control reduces Hc to~2.5 A m−1but does not reach the level achieved by PCT,indicating that rapid heating alone cannot account for the superior magnetic softening.Finite‐element simulations and structural characterization show that PCT produces rapid and nearly uniform Joule heating,enabling efficient structural relaxation and enhanced medium‐range order while retaining an overall amorphous structure.Compared with conventional annealing,PCT implements a distinct,pulse energy injection pathway on the potential energy landscape,enabling more controllable tuning of amorphous configurations.This work establishes PCT as a versatile approach for tailoring both magnetic and mechanical properties in amorphous soft magnetic materials,paving the way for their optimized application in advanced electromagnetic devices. 展开更多
关键词 amorphous alloys microstructures pulse current training soft magnetic properties
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Tailoring magnetic softness of Fe-based amorphous alloys with superior magnetization by magnetic field annealing 认领 引用 被引量：5
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作者 Long Hou Benjun Wang +9 位作者 Li Liu Xinhao Mao Mingya Zhang Chenchen Yuan Zhong Li Wenwei Ju Hanchen Feng Chengying Tang Ailin Xia Weihuo Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2024年第33期27-37,共11页
The inverse relationship between the saturation magnetic flux density(Bs)and coercivity(Hc)of Febased amorphous alloys is a very active research topic that has been extensively debated.In this work,we conducted a deta... The inverse relationship between the saturation magnetic flux density(Bs)and coercivity(Hc)of Febased amorphous alloys is a very active research topic that has been extensively debated.In this work,we conducted a detailed investigation on the magnetic softness of Fe83.2-xCoxB10C6Cu0.8(x=0 and 6 at.%)amorphous alloys based on analysis of the surface morphology,microstructure,magnetic anisotropy,and magnetic domain structure.Enhanced magnetic softness-magnetization synergy was realized in the present alloys by magnetic field annealing(MFA)during the de-stressing process.A dramatic 84%reduction of Hc to 2.2 A/m was achieved for the Co-doped alloy under MFA,exhibiting excellent magnetic performance with a superb Bs of 1.86 T.The consistency between the experimental results and theoretical analysis revealed that the MFA process can mitigate the trade-off between stress-induced anisotropy and induced uniaxial anisotropy owing to the homogenized structure formed by field annealing.Thus,the process favored a low Hc due to the significant continuous decline in the total magnetic anisotropy,which coincided well with the results of Magneto-optical Kerr microscopy.The study elucidates a mechanism for tuning Hc in Co-doped alloy systems and affords a possible pathway for softening amorphous alloys with high Bs. 展开更多
关键词 Amorphous alloy De-stressing magnetic field annealing Magnetic softness Microstructure Magnetic anisotropy
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Excellent magnetic softness in TbFe/FeCoV multilayers 认领 引用 被引量：4
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作者 FENG Tangf LI Yongle CHEN Ziyu 《Rare Metals》 SCIE EI CAS CSCD 2011年第4期322-326,共5页
[Tb4oFe6o（x nm）/Fe49Co49V2（y nm）]N multilayers were prepared by multitarget magnetron sputtering using a rotary turn-table technique in a stop-and-go mode. The mulfilayers were investigated using X-ray diffraction... [Tb4oFe6o（x nm）/Fe49Co49V2（y nm）]N multilayers were prepared by multitarget magnetron sputtering using a rotary turn-table technique in a stop-and-go mode. The mulfilayers were investigated using X-ray diffraction, field emission scan electron microscopy and vibrating sample magnetometry. The result shows that the coercive field drops abruptly with increasing number of bilayers, and it remains generally stable when the number of bilayers is 10 or higher. An excellent magnetic softness with a coercivity of 1.0 mT is obtained for x = 5 and y = 5 after annealing at 250℃. A crystalline state is observed in FeCoV layers before and after annealing by X-ray diffraction. 展开更多
关键词 rnagnetostdctive devices multiplayer films magnetic softness magnetron sputtering coercivity
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Metallic Softness Influence on Magic Numbers of Clusters 认领 引用
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作者 Liu Hao-yang Zou Xian-wu +1 位作者 Ren Da-zhi Jin Zhun-zhi 《Wuhan University Journal of Natural Sciences》 EI CAS 2000年第3期301-306,共6页
The metallic softness parameterαr 0 determines the structure of the cluster and governs the rule of magic numbers. Using molecular dynamic method, the stable structures and magic numbers are determined for the cluste... The metallic softness parameterαr 0 determines the structure of the cluster and governs the rule of magic numbers. Using molecular dynamic method, the stable structures and magic numbers are determined for the clusters consisting of 13 up to 147 atoms in medium range Morse potentials, which is suitable for most of metals. As the number of atoms constituting the cluster increases, the stable structures undergo transition from face-centered (FC) to edge-centered (EC) structures. The magic number take ones of FC series before transition and take ones of EC series after that. The transition point from FC to EC structures depends on the value of softness parameter. 展开更多
关键词 cluster magic number softness
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Dependence of Softness on Fabric Surface Quality and Compressibility 认领 引用
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作者 胡吉永 丁辛 王如彬 《Journal of Donghua University(English Edition)》 EI CAS 2006年第5期59-63,共5页
The term ＂softness＂ is loosely used to describe the physical as well as sensory attributes of fabric and other textiles, and several psychophysicai evaluation methods as well as its predicting equations exist. Howev... The term ＂softness＂ is loosely used to describe the physical as well as sensory attributes of fabric and other textiles, and several psychophysicai evaluation methods as well as its predicting equations exist. However, the information for physiological mechanism of fabric softness is lack. To explain the blomechauical and the potential neurophysiologicai phecnomenon for exploring fabric softness, accompanying to the procedures in manual exploration for softness and the anatomical multllayor structures of human finer, a contact finite dement （FE） model between finger and fabric is made to conduct an active contact analysis. In present FE model, the effect of surface friction index, compression modulus, Poisson＇s ratio of fabric on softness dlscrimination is Investigated. The interests are in the contributlons of these fabric property variables to contact area, Interracial friction shear stress and contact pressure distributions, which arc significant cognitive variables or stimulus parameters in peripheral neural levels. The mechanistic data for fabric specimens indicates that the basis for the perception of softness of flexible and bulk fabric is likely on the spatial variation of pressure on the skin （or, equivalently the skin displacement and its derivatives） resulting from surface friction phenomenon and compression property of fabric. In present model, however, the effect of Poisson＇s ratio on the total force exerted by fingertip is not significant statistically. Therefore, compression modulus of fabric is, not the only underlying physical variable accounting for peripheral neural response, and also the surface friction phenomenon plays an important role in feeltouch softness of fabric, i.e. the compressibility and surface properties of fabric arc the necessary physical variables involved for the haptic rendering of its softness. 展开更多
关键词 fabric softness FE model friction compressibility.
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Design and passive analysis of a novel softness display device 认领 引用
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作者 吴涓 Song Aiguo Li Jianqing 《High Technology Letters》 EI CAS 2007年第3期239-243,共5页
Simulating the softness property of object is quite a challenge in virtual reality system. A novel softness display system was developed based on the principle of deformable length of elastic element control （DLEEC）... Simulating the softness property of object is quite a challenge in virtual reality system. A novel softness display system was developed based on the principle of deformable length of elastic element control （DLEEC）. In the system, the equivalent stiffness of the device is adjustable, and is inversely proportional to the third power of the deformable length of elastic beam. PD position control is employed to guarantee the accurate softness display. The softness of the virtual objects in large scale can be felt with the softness display device. Compared with other haptic devices, the device is passive and exert the react force only when the operator ＂actively touch＂ the virtual objects. The stability of the softness display system was analyzed. It was theoretical proved that the system satisfied the criteria of wide impedance range ＂Z-width＂, and the performance was superior to an active system. The experimental results were presented. 展开更多
关键词 softness display elastic beam virtual reality passive
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Excellent magnetic softness-magnetization synergy and suppressed defect activation in soft magnetic amorphous alloys by magnetic field annealing 认领 引用 被引量：6
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作者 Qiang Luo Donghui Li +5 位作者 Mingjuan Cai Siyi Di Zhengguo Zhang Qiaoshi Zeng Qianqian Wang Baolong Shen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第21期72-82,共11页
Fe-based amorphous alloys with high saturation magnetic flux density(Bs)are increasingly attractive from both scientific and technological points of view,however,they usually suffer from the trade-off between magne... Fe-based amorphous alloys with high saturation magnetic flux density(Bs)are increasingly attractive from both scientific and technological points of view,however,they usually suffer from the trade-off between magnetization and softness.In this work,we explore the soft magnetic properties(SMPs),magnetic and atomic structures,and defect activation during creep deformation of as-quenched and annealed Fe82.65-xCoxSi2B14Cu1.35(x=0-20)amorphous alloys(AAs).Improved magnetic softness-magnetization synergy has been realized in all these alloys by field annealing.Particularly,superb SMPs with superhigh Bs of 1.86 T,low coercivity of 1.2 A/m and high effective permeability of 16300 are obtained in the Fe66.65Co16Si2B14Cu1.35 AA.The locally regularized arrangement of domains,homogenized structure with less structural/magnetic defects and suppressed crystal-like ordering by field annealing contribute synergistically to the superb SMPs.Besides,the relaxation time spectra obtained from creep deformation indicate less liquid-like and solid-like defects activated in the field-annealed AA,which is correlated with the structural homogenization and superb SMPs.This work provides new and comprehensive insight into the interplay among external field,heterogeneous structure,SMPs and defect activation of Fe-based AAs,and offers a promising pathway for softening amorphous alloys with high Bs. 展开更多
关键词 Fe-based amorphous alloy Soft magnetic performance Magnetic field annealing Heterogeneous structure Defect activation
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Correlation of microstructure and magnetic softness of Si-microalloying FeNiBCuSi nanocrystalline alloy revealed by nanoindentation 认领 引用
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作者 Benjun Wang Wenjun Liu +9 位作者 Li Liu Yu Wang Yu Hang Xinyu Wang Mengen Shi Hanchen Feng Long Hou Chenchen Yuan Zhong Li Weihuo Li 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第12期351-359,共9页
Compared to the commercial soft-magnetic alloys,the high saturation magnetic flux density(Bs)and low coercivity(Hc)of post-developed novel nanocrystalline alloys tend to realize the miniaturization and lightweight of ... Compared to the commercial soft-magnetic alloys,the high saturation magnetic flux density(Bs)and low coercivity(Hc)of post-developed novel nanocrystalline alloys tend to realize the miniaturization and lightweight of electronic products,thus attracting great attention.In this work,we designed a new FeNiBCuSi formulation with a novel atomic ratio,and the microstructure evolution and magnetic softness were investigated.Microstructure analysis revealed that the amount of Si prompted the differential chemical fluctuations of Cu element,favoring the different nucleation and growth processes ofα-Fe nanocrystals.Furthermore,microstructural defects associated with chemical heterogeneities were unveiled using the Maxwell-Voigt model with two Kelvin units and one Maxwell unit based on creeping analysis by nanoindentation.The defect,with a long relaxation time in relaxation spectra,was more likely to induce the formation of crystal nuclei that ultimately evolved into theα-Fe nanocrystals.As a result,Fe84Ni2B12.5Cu1Si0.5alloy with refined uniform nanocrystalline microstructure exhibited excellent magnetic softness,including a high Bsof 1.79 T and very low Hcof 2.8 A/m.Our finding offers new insight into the influence of activated defects associated with chemical heterogeneities on the microstructures of nanocrystalline alloy with excellent magnetic softness. 展开更多
关键词 nanocrystalline alloy magnetic softness microstructures defects nanoindentation
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Understanding Chemical Reactivity in Extended Systems:Exploring Models of Chemical Softness in Carbon Nanotubes 认领 引用
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作者 CáRDENAS Carlos MUNOZ Macarena +3 位作者 CONTRERAS Julia AYERS Paul W. GóMEZ Tatiana FUENTEALBA Patricio 《物理化学学报》 SCIE CAS CSCD 北大核心 2018年第6期631-638,共8页
Chemical reactivity towards electron transfer is captured by the Fukui function.However,this is not well defined when the system or its ions have degenerate or pseudo-degenerate ground states.In such a case,the first-... Chemical reactivity towards electron transfer is captured by the Fukui function.However,this is not well defined when the system or its ions have degenerate or pseudo-degenerate ground states.In such a case,the first-order chemical response is not independent of the perturbation and the correct response has to be computed using the mathematical formalism of perturbation theory for degenerate states.Spatialpseudo-degeneracy is ubiquitous in nanostructures with high symmetry and totally extended systems.Given the size of these systems,using degenerate-state perturbation theory is impractical because it requires the calculation of many excited states.Here we present an alternative to compute the chemical response of extended systems using models of local softness in terms of the local density of states.The local softness is approximately equal to the density of states at the Fermi level.However,such approximation leaves out the contribution of inner states.In order to include and weight the contribution of the states around the Fermi level,a model inspired by the long-range behavior of the local softness is presented.Single wall capped carbon nanotubes(SWCCNT)illustrate the limitation of the frontier orbital theory in extended systems.Thus,we have used a C360 SWCCNT to test the proposed model and how it compares with available models based on the local density of states.Interestingly,a simple Hückel approximation captures the main features of chemical response of these systems.Our results suggest that density-of-states models of the softness along simple tight binding Hamiltonians could be used to explore the chemical reactivity of more complex system,such a surfaces and nanoparticles. 展开更多
关键词 Local softness Fukui function Reactivity Carbon nanotubes Density of states
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Monohalogenated acetamide-induced cellular stress and genotoxicity are related to electrophilic softness and thiol/thiolate reactivity 认领 引用 被引量：1
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作者 Justin A.Pals Elizabeth D.Wagner +2 位作者 Michael J.Plewa Menghang Xia Matias S.Attene-Ramos 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第8期224-230,共7页
Haloacetamides（HAMs） are cytotoxic, genotoxic, and mutagenic byproducts of drinking water disinfection. They are soft electrophilic compounds that form covalent bonds with the free thiolhiolate in cysteine residues ... Haloacetamides（HAMs） are cytotoxic, genotoxic, and mutagenic byproducts of drinking water disinfection. They are soft electrophilic compounds that form covalent bonds with the free thiolhiolate in cysteine residues through an S_N2 reaction mechanism.Toxicity of the monohalogenated HAMs（iodoacetamide, IAM; bromoacetamide, BAM;or chloroacetamide, CAM） varied depending on the halogen substituent. The aim of this research was to investigate how the halogen atom affects the reactivity and toxicological properties of HAMs, measured as induction of oxidative/electrophilic stress response and genotoxicity. Additionally, we wanted to determine how well in silico estimates of electrophilic softness matched thiolhiolate reactivity and in vitro toxicological endpoints.Each of the HAMs significantly induced nuclear Rad51 accumulation and ARE signaling activity compared to a negative control. The rank order of effect was IAM 〉 BAM 〉 CAM for Rad51, and BAM ≈ IAM 〉 CAM for ARE. In general, electrophilic softness and in chemico thiolhiolate reactivity provided a qualitative indicator of toxicity, as the softer electrophiles IAM and BAM were more thiolhiolate reactive and were more toxic than CAM. 展开更多
关键词 Drinking water disinfection byproducts Haloacetamide Toxicity Soft electrophile Oxidative stress DNA damage
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Multiple deformable units enabling superior plasticity and softness in SnS2 van der Waals crystals 认领 引用 被引量：1
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作者 Yifei Liu Ling Fu +4 位作者 Leping Xu Haoran Huang Kunpeng Zhao Tian-Ran Wei Xun Shi 《Science China Materials》 SCIE EI CAS CSCD 2026年第4期2317-2322,共6页
Two-dimensional(2D)van der Waals(vdW)crystals,stacked via atomically thin layers,have emerged as a captivating class of materials with rich functionalities[1].Aside from the welldefined single layer as the functional ... Two-dimensional(2D)van der Waals(vdW)crystals,stacked via atomically thin layers,have emerged as a captivating class of materials with rich functionalities[1].Aside from the welldefined single layer as the functional unit,the weak interlayer vdW interaction gives rise to a large room to modulate the stacking order,making vdW crystals a special matter between the 2D and 3D materials[2]. 展开更多
关键词 atomically thin layershave deformable units plasticity d d materials SNS van der Waals crystals interlayer van der Waals interaction softness two dimensional materials
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Role of substrate softness in stabilizing surface nanobubbles 认领 引用
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作者 Changsheng Chen Xianren Zhang Dapeng Cao 《Green Energy & Environment》 SCIE EI CAS CSCD 2020年第3期374-380,共7页
The contact line pinning and supersaturation theory for the nanobubble stability has attracted extensive concerns from experimental investigators,and some experimenters argue that the contact line pinning is unnecessa... The contact line pinning and supersaturation theory for the nanobubble stability has attracted extensive concerns from experimental investigators,and some experimenters argue that the contact line pinning is unnecessary.To interpret the experimental observations,we have proposed previously through molecular dynamics simulations that the deformation of soft substrates caused by surface nanobubbles may play an important role in stabilizing surface nanobubbles,while yet no quantitative theory is available for explanation of this mechanism.Here,the detailed mechanism of self-pinning-induced stability of surface nanobubbles is investigated through theoretical analysis.By manipulating substrate softness,we find that the formation of surface nanobubbles may create a deformation ridge nearby their contact lines which leads to the self-pinning effect.Theoretical analysis shows that the formation of nanobubbles on sufficiently rigid substrates or on liquid-liquid interfaces corresponds to a local free energy maximum,while that on the substrates with intermediate softness corresponds to a local minimum.Thus,the substrate softness could regulate the surface nanobubble stability.The critical condition for the self-pinning effect is determined based on contact line depinning,and the effect of gas supersaturation is explored.Finally,the approximate stability range for the surface nanobubbles is also predicted. 展开更多
关键词 Surface nanobubble Soft substrate Stability Self-pinning
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Microscopic damage and deterioration of carbonaceous slate in cold region subjected to freeze-thaw cycles 认领 引用 被引量：3
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作者 Peichao Zheng Xianjun Tan +5 位作者 Zhihao Du Xianhuan Liu Yun Zhou Kai Shen Bo Guan Weizhong Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期113-128,共16页
Freezing and thawing processes play a crucial role in causing significant deformation and damage to layered soft rocks in cold region due to daily and seasonal temperature fluctuations.However,the frost heave mechanis... Freezing and thawing processes play a crucial role in causing significant deformation and damage to layered soft rocks in cold region due to daily and seasonal temperature fluctuations.However,the frost heave mechanism of the rocks and their mechanical behaviors at the meso-scale still require further investigations.For this,we focused on carbonaceous slate reported in a high-altitude cold region,in terms of mineral composition,content,and microstructure.The strength and failure of mineral grain(MG)interfaces are studied using three-point-bending tests,in order to explore the evolution of mode I fracture toughness and tensile strength with the Dugdale-Barenblatt model and the Weibull distribution model.The results indicate that the damage of slate involves the initiation and propagation of microfracture networks at clay MG interfaces(bedding planes),driven by frost heave pressure at macroscopic and microscopic scales.This process causes the detachment of some MGs,resulting in fracture surfaces with a distinctive pulled-off planar structure.The hydrophilicity of clay MGs,interfacial strengths,and microfracture structures contribute to the freeze-thaw damage.As the number of freeze-thaw cycles increases,the effective area per unit decreases,leading to an exponentially decreasing in mode I fracture toughness and tensile strength at MG interfaces.Approximately 67%strength degradation occurs after 14 freeze-thaw cycles.This provides theoretical basis and experimental methods for better understanding the damage and deterioration behaviors of layered soft rocks in cold region under natural freeze-thaw cycles. 展开更多
关键词 Freeze-thaw damage Layered soft rocks Tensile strength Mode I fracture toughness Crack propagation
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Bio-inspired magnetic soft robots with omnidirectional climbing for multifunctional biomedical applications 认领 引用 被引量：1
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作者 Ruomeng Xu Xianli Wang +2 位作者 Yuanhe Chen Lap Mou Tam Qingsong Xu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第1期685-695,共11页
In recent years,the rising incidence of gastrointestinal(GI)cancer has triggered an urgent need for effective early intervention strategies.Traditional endoscopic techniques often cause patient discomfort,and it is di... In recent years,the rising incidence of gastrointestinal(GI)cancer has triggered an urgent need for effective early intervention strategies.Traditional endoscopic techniques often cause patient discomfort,and it is difficult to navigate deep regions of complex organ structures.This work proposes a kind of bio-inspired magnetic soft robot(BMSR)to address these challenges.The design of the BMSRs is inspired by the rolling motion of the golden wheel spider.Two six-degree-of-freedom(6-DOF)robotic arms are used,where one arm is responsible for real-time manipulation of the BMSRs,and the other is dedicated to monitoring their status.Under the actuation of an external rotating magnetic field,the BMSRs can flexibly climb on inclined surfaces at any angle,involving the inverted surface.Through the powerful output force,the BMSRs can overcome the mobility barrier induced by different human organs,including mucus,folds,and height differences of up to 8 cm.Such an exceptional mobility enables the BMSRs to deliver drugs in the targeted complex GI environment.Moreover,in combination with an endoscope,it provides real-time visual feedback for precise navigation.In vitro animal experiments validate the feasibility of BMSRs,paving a way for their usage in minimally invasive GI treatment.This work advances the potential applications of magnetic soft robots in the biomedical field. 展开更多
关键词 magnetic millirobots magnetic actuation medical robotics soft robots bio-inspired robots
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An intracellular Ras-group related leucine-rich repeat protein IbPIRL8 increases soft rot and root rot resistance in sweet potato 认领 引用 被引量：1
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作者 Wenbin Wang Kui Peng +6 位作者 Meiqi Shang Hong Zhai Shaopei Gao Ning Zhao Qingchang Liu Huan Zhang Shaozhen He 《The Crop Journal》 SCIE CSCD 2026年第3期849-858,共10页
The plant intracellular Ras-group related leucine-rich repeat proteins(PIRLs)play important roles in pollen tube growth and development.However,the role of PIRLs in modulating defense responses against fungal diseases... The plant intracellular Ras-group related leucine-rich repeat proteins(PIRLs)play important roles in pollen tube growth and development.However,the role of PIRLs in modulating defense responses against fungal diseases has not been reported.In this study,the IbPIRL8 gene was isolated from the resistant variety Nongdabai.Its expression was strongly induced by salicylic acid(SA)and methyl jasmonate.The IbPIRL8 protein was localized to the nucleus and cell membrane.Overexpression of IbPIRL8 conferred resistance to soft rot and root rot in sweet potato.Key SA-responsive genes,cellulose biosynthesisrelated genes and callose biosynthesis-related genes were upregulated in IbPIRL8-OE plants compared with wild type(WT).Consistently,the storage roots of IbPIRL8-OE plants accumulated more endogenous SA,cellulose and callose than WT plants.Yeast one-hybrid,dual-luciferase,and electrophoretic mobility shift assays demonstrated that IbDEAR2,induced by Rhizopus stolonifer,binds to the IbPIRL8 promoter to repress its expression.These findings provide insights into the genetic basis for improving diseaseresistant sweet potato varieties. 展开更多
关键词 Sweet potato IbPIRL8 IbDEAR2 Soft rot Root rot
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Dynamic improvement and reliability enhancement of a high speed on/off valve based on pre-excitation soft switching control 认领 引用 被引量：1
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作者 Qi ZHONG Weihang ZHOU +3 位作者 Enguang XU Junxian WANG Xiaohang SHAN Huayong YANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期582-592,共11页
High Speed on/off Valve(HSV)is an essential component in Aerospace Digital Hydraulic Systems(ADHS),which impose stringent requirements on the dynamic performance and reliability of HSV due to the extreme application e... High Speed on/off Valve(HSV)is an essential component in Aerospace Digital Hydraulic Systems(ADHS),which impose stringent requirements on the dynamic performance and reliability of HSV due to the extreme application environments.However,the faster dynamic leads to increased impact between the spool and valve body,causing severe vibration and wear,which creates a conflict between rapid dynamic and high reliability.To address this problem,a Pre-Excitation Soft Switching Control(PESSC)with both pre-excitation and reverse deceleration functionalities is proposed.The initial current is optimized through pre-excitation to accelerate the opening time,while the application of reverse voltage hastens the decline of electromagnetic force,thereby reducing the spool velocity.The PESSC simultaneously achieves both faster dynamic performance and smaller impact velocity.Moreover,the optimal deceleration voltage parameters are obtained through multi-objective optimization.Experimental results demonstrate that the optimized PESSC shortens the opening time from 2.22 ms to 1.65 ms,reduces the impact velocity by 58.3%,and lowers wear by 55.4%.These findings underline the huge potential of PESSC in enhancing the dynamic performance and reliability of HSVs,offering promising applications in aerospace. 展开更多
关键词 Dynamic response High speed on/off valve Impact velocity Multi-objective optimization Pre-excitation Soft switching
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Cooperative Pursuit of Unmanned Surface Vehicles Using Multi-Agent Reinforcement Learning 认领 引用 被引量：1
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作者 QU Xingru LI Chu +2 位作者 JIANG Yuze LONG Feifei ZHANG Rubo 《Journal of Shanghai Jiaotong university(Science)》 EI 2026年第1期187-194,共8页
This paper is concerned with the cooperative pursuit of unmanned surface vehicles(USVs)against the dynamic escaping target using multi-agent reinforcement learning.The Markov game process is established for pursuit-ev... This paper is concerned with the cooperative pursuit of unmanned surface vehicles(USVs)against the dynamic escaping target using multi-agent reinforcement learning.The Markov game process is established for pursuit-evasion,and the success criteria for cooperative capture of USVs are given by using distance and angle constraints.By virtue of the centralized training and decentralized execution framework as well as the long short-term memory network,cooperative pursuit training is conducted using the multi-agent soft actor-critic reinforcement learning,which can optimize capture performance of USVs against the escaping target.Besides,to avoid the occurrence of lazy capturer and increase the capture success rate,a multi-stage reward guidance method is developed,where the training process can be optimized according to the current states of both sides,effectively guiding vehicle to achieve the capture task from easy to difficult.Simulations are provided to illustrate the effectiveness of the proposed reinforcement learning method for cooperative pursuit of USVs. 展开更多
关键词 unmanned surface vehicle(USV) cooperative pursuit multi-agent soft actor-critic multi-stage reward
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Analytical method for softness abrasive flow field based on discrete phase model 认领 引用 被引量：32
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作者 JI ShiMing XIAO FengQing TAN DaPeng 《Science China(Technological Sciences)》 SCIE EI CAS 2010年第10期2867-2877,共11页
Aiming at the problem of difficult contact finishing for mini structural surface in course of mould manufacturing,a new no-tool precision machining method based on soft abrasive flow machining(SAFM)was proposed.It all... Aiming at the problem of difficult contact finishing for mini structural surface in course of mould manufacturing,a new no-tool precision machining method based on soft abrasive flow machining(SAFM)was proposed.It allocated restrained component near surface machined,constituted restrained abrasive flow passage,and made the surface become a segment of passage wall.It could control turbulence abrasive flow in restrained passage,realize micro cutting for passage wall,and utilize the irregular motion of abrasive flow to eliminate the mono-directional marks on machined surfaces,and the precision could reach the specular level.A two-phase dynamic model of abrasive flow oriented to SAFM combined with discrete phase model(DPM)was established,the law of two-phase flow motion and the related physical parameters was obtained by corresponding numerical simulation method,and the mechanism of precision machining in SAFM was discussed.Simulation results show that the abrasive flow machining process mainly appears as translation of ablating location with the influence by granular pressure,and as the variation of machining efficiency with the influence by near-wall particle velocity.Thus via control of the inlet velocity and its corresponding machining time,it is supposed to work out the machining process according to the machining requirements by using the Preston equation to seek the relationship among velocity,pressure and material removing rate.By tracking near-wall particles,it can be confirmed that the movement of near-wall abrasive particles is similar to stream-wise vortices.The cutting traces on workpiece surfaces assume disorderly arrangement,so the feasibility of the SAFM method can be reaffirmed. 展开更多
关键词 structural flow passage ultra-precision machining softness abrasive flow discrete phase model
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Remarkable plasticity and softness of polymorphic InSe van der Waals crystals 认领 引用 被引量：9
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作者 Yupeng Ma Haoran Huang +6 位作者 Yifei Liu Heyang Chen Xudong Bai Kunpeng Zhao Min Jin Tian-Ran Wei Xun Shi 《Journal of Materiomics》 SCIE CSCD 2023年第4期709-716,共8页
Indium selenide(InSe)crystals are reported to show exceptional plasticity,a new property to twodimensional van der Waals(2D vdW)semiconductors.However,the correlation between plasticity and specific prototypes is uncl... Indium selenide(InSe)crystals are reported to show exceptional plasticity,a new property to twodimensional van der Waals(2D vdW)semiconductors.However,the correlation between plasticity and specific prototypes is unclear,and the understanding of detailed plastic deformation mechanisms is inadequate.Here three prototypes of InSe are predicted to be plastically deformable by calculation,and the plasticity of polymorphic crystals is verified by experiment.Moreover,distinct nanoindentation behaviors are seen on the cleavage and cross-section surfaces.The modulus and hardness of InSe are the lowest ones among a large variety of materials.The plastic deformation is further perceived from chemical interactions during the slip process.Particularly for the cross-layer slip,the initial In-Se bonds break while new In-In and Se-Se bonds are newly formed,maintaining a decent interaction strength.The remarkable plasticity and softness alongside the novel physical properties,endow InSe great promise for application in deformable and flexible electronics. 展开更多
关键词 InSe 2D vdW crystal Polymorphism Plasticity Softness
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