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An Energy Optimization Algorithm for WRSN Nodes Based on Regional Partitioning and Inter-Layer Routing 认领 引用 被引量：1
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作者 Cui Zhang Lieping Zhang +2 位作者 Huaquan Gan Hongyuan Chen Zhihao Li 《Computers, Materials & Continua》 SCIE EI 2025年第8期3125-3148,共24页
In large-scaleWireless Rechargeable SensorNetworks(WRSN),traditional forward routingmechanisms often lead to reduced energy efficiency.To address this issue,this paper proposes a WRSN node energy optimization algorith... In large-scaleWireless Rechargeable SensorNetworks(WRSN),traditional forward routingmechanisms often lead to reduced energy efficiency.To address this issue,this paper proposes a WRSN node energy optimization algorithm based on regional partitioning and inter-layer routing.The algorithm employs a dynamic clustering radius method and the K-means clustering algorithm to dynamically partition the WRSN area.Then,the cluster head nodes in the outermost layer select an appropriate layer from the next relay routing region and designate it as the relay layer for data transmission.Relay nodes are selected layer by layer,starting from the outermost cluster heads.Finally,the inter-layer routing mechanism is integrated with regional partitioning and clustering methods to develop the WRSN energy optimization algorithm.To further optimize the algorithm’s performance,we conduct parameter optimization experiments on the relay routing selection function,cluster head rotation energy threshold,and inter-layer relay structure selection,ensuring the best configurations for energy efficiency and network lifespan.Based on these optimizations,simulation results demonstrate that the proposed algorithm outperforms traditional forward routing,K-CHRA,and K-CLP algorithms in terms of node mortality rate and energy consumption,extending the number of rounds to 50%node death by 11.9%,19.3%,and 8.3%in a 500-node network,respectively. 展开更多
关键词 Wireless rechargeable sensor network regional partitioning inter-layer routing energy optimization
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A Brief Review of Models for Adhesive Contact at the Single-Asperity Level 认领 引用 被引量：1
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作者 Gan-Yun Huang Jin-Shan He Zhao-Yang Ma 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第4期363-372,共10页
Adhesive interaction is a ubiquitous phenomenon in various aspects of nature and engineering,driving extensive research on adhesive contact over past decades.This brief review surveys adhesive contact models at the si... Adhesive interaction is a ubiquitous phenomenon in various aspects of nature and engineering,driving extensive research on adhesive contact over past decades.This brief review surveys adhesive contact models at the single-asperity level.Attention has been focused on how adhesive interaction is accounted for in models of normal contact,inclined contact,and contact with rolling tendency,and hence the corresponding interfacial tractions have been outlined.Perspectives on remaining challenges in adhesive contact mechanics have also been summarized. 展开更多
关键词 Adhesion Normal contact Inclined contact Rolling tendency Pull-off force Friction
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Numerical investigation on the influence of mesoscopic deformation on contact area and hydraulic aperture to fracture seepage 认领 引用 被引量：2
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作者 Chenghao Han Yuanlin Bai +3 位作者 Weijie Zhang Jicheng Zhang Hongfa Ma Weiye Li 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第2期567-580,共14页
Fluid flow through a single fracture is commonly described by the cubic law.However,deviations from this model are expected because natural fracture surfaces are rough and in contact with each other in discrete region... Fluid flow through a single fracture is commonly described by the cubic law.However,deviations from this model are expected because natural fracture surfaces are rough and in contact with each other in discrete regions.In this study,the interactions between fracture closure,contact area,and hydraulic characterization of mesoscopic-scale rough fractures were investigated.First,natural-splitting fractures induced by Brazilian splitting were generated and digitally reproduced using a three-dimensional scanner.The distribution characterization of the initial mechanical fracture apertures was described,and the variation in fracture contact area during fracture closure was evaluated.Second,numerical simulations of fluid flow between rough surfaces were conducted,and the Stokes equations were solved.The results reveal that the hydraulic aperture underwent three stages.When the contact area was less than 0.34%,changes in the hydraulic aperture resulted in flow rate changes that were consistent with the cubic law.When the contact area was between 0.34%and 14.41%,the hydraulic aperture gradually deviated from the cubic law and fell below the mean fracture aperture.At this stage,the hydraulic aperture should be fully considered rather than the mean fracture aperture.When the contact area exceeds 14.41%,although the mechanical fracture decreases with increasing strain,the influence of the contact area on the hydraulic aperture gradually diminishes.This is because the fractures contain less fluid,and the hydraulic aperture approaches the minimum.Finally,the relationship between mechanical and hydraulic aperture strains was established,improving geological engineering applications that account for fracture deformation. 展开更多
关键词 contact area hydraulic aperture mesoscopic deformation rough fracture seepage characteristics
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A peridynamics modeling approach for pre-cracked rock cracking processes under impact by integrating Drucker-Prager plasticity model and efficient contact model 认领 引用 被引量：2
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作者 Jingzhi Tu Nengxiong Xu Gang Mei 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期179-195,共17页
In rock engineering,natural cracks in rock masses subjected to external loads tend to initiate and propagate,leading to potential safety hazards.To investigate the effect of cracking behavior on the mechanical propert... In rock engineering,natural cracks in rock masses subjected to external loads tend to initiate and propagate,leading to potential safety hazards.To investigate the effect of cracking behavior on the mechanical properties of rocks,the cracking processes of pre-cracked rocks have been extensively studied using numerical modeling methods.The peridynamics(PD)exhibits advantages over other numerical methods due to the absence of the requirements for remeshing and external crack growth criterion.However,for modeling pre-cracked rock cracking processes under impact,current PD implementations lack generally applicable rock constitutive models and impact contact models,which leads to difficulties in determining rock material parameters and efficiently calculating impact loads.This paper proposes a non-ordinary state-based peridynamics(NOSBPD)modeling method integrating the Drucker-Prager(DP)plasticity model and an efficient contact model to address the above problems.In the proposed method,the Drucker-Prager plasticity model is integrated into the NOSBPD,thereby equipping NOSBPD with the capability to accurately characterize the nonlinear stress-strain relationship inherent in rocks.An efficient contact model between particles and meshes is designed to calculate the impact loads,which is essentially a coupling method of PD with the finite element method(FEM).The effectiveness of the proposed NOSBPD modeling method is verified by comparison with other numerical methods and experiments.Experimental results indicate that the proposed method can effectively and accurately predict the 3D cracking processes of pre-cracked cracks under impact loading,and the maximum principal stress is the key driver behind wing crack formation in pre-cracked rocks. 展开更多
关键词 Pre-cracked rocks Cracking processes Non-ordinary state-based peridynamics (NOSBPD) Drucker-Prager plasticity model Efficient contact model
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An innovative design driven by contact performances for skiving of spur face gear drive with single cutter 认领 引用
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作者 TANG Zhong-wei ZHOU Yuan-sheng +4 位作者 MO Shuai TANG Jin-yuan MA Chi ZHANG Wu-ji HE Hai-yu 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期175-188,共14页
This study develops a contact performance-driven method for skiving face gear drives using a single cutter,eliminating the traditional need for separate cutters to reduce production costs and time.First,the mathematic... This study develops a contact performance-driven method for skiving face gear drives using a single cutter,eliminating the traditional need for separate cutters to reduce production costs and time.First,the mathematical models of the tooth flanks for the face gear drives are established based on the gear skiving processes.Then,load tooth contact analysis(LTCA)model is established to calculate the contact performance data.Next,a two-stage optimization model is employed to determine the optimal parameters of the cutting edge with improved contact performances.The effectiveness of this method is validated through simulations and rolling tests.Compared with the traditional method,the proposed method can machine both the face gear and its mating pinion with a single cutter.Simulation results show that the proposed method avoids tooth surface edge contact,with the maximum tooth surface contact stress reduced by 31.7%,the contact ratio decreases by 21.5%,and the transmission error increases by 22.3%.Rolling tests verify the consistency of tooth surface contact patterns between simulations and experiments.The proposed method provides a reference for the cutting edge design of skiving cutters for face gear pairs. 展开更多
关键词 face gear drives gear skiving load tooth contact analysis contact performances cutter design
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Direct fabrication of record low specific resistivity metal contacts for n-type AlxGa1-xN(x≥0.8) 认领 引用
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作者 Tingang Liu Haicheng Cao +5 位作者 Mingtao Nong Zhiyuan Liu Zixian Jiang Kexin Ren Glen Isaac Maciel Garcia Xiaohang Li 《Journal of Semiconductors》 EI CAS CSCD 2026年第5期114-120,共7页
Al-rich AlxGa1-xN(x≥0.8)is promising for power and deep-ultraviolet(DUV)optoelectronic applications,owing to its ultra-wide bandgap and excellent thermal stability.However,forming low-resistivity contacts on n-... Al-rich AlxGa1-xN(x≥0.8)is promising for power and deep-ultraviolet(DUV)optoelectronic applications,owing to its ultra-wide bandgap and excellent thermal stability.However,forming low-resistivity contacts on n-type Al-rich AlGaN remains a significant challenge.In this work,we utilized an Au-free Ti/Al/Ti metal stack contact on n-type Al-rich AlGaN without graded layers.Record-low contact resistivities were achieved after annealing:1.52×10-6Ω·cm2for n-Al0.8Ga0.2N,3.56×10-6Ω·cm2for n-Al0.86Ga0.14N,and 5.79×10-5Ω·cm2for n-Al0.9Ga0.1N.These results demonstrate a significant advancement in forming low-resistance contacts directly on Al-rich n-AlGaN,offering a viable path forward for next-generation power electronics and DUV optoelectronic devices. 展开更多
关键词 Al-rich AlGaN ohmic contact contact resistivity
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A comprehensive analysis and improvement of classical nonconformal contact force models for revolute joints with clearance 认领 引用
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作者 Fushou Liu Wenguang Pan Dongping Jin 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期56-68,共13页
Revolute joints are widely used in various engineering fields such as deployable space structures and robotics.Currently,various theoretical models have been applied to evaluate the normal contact force of the revolut... Revolute joints are widely used in various engineering fields such as deployable space structures and robotics.Currently,various theoretical models have been applied to evaluate the normal contact force of the revolute joints;however,the results obtained by these models often exhibit significant discrepancies,and there is a lack of explanation for the reasons behind these discrepancies.This study explores the underlying theories of three classical non-conformal contact force models for revolute joints,namely the ESDU-78035 model,the Radzimovsky model,and the Dubowsky-Freudenstein model.The theoretical differences among these classical models are analyzed,and their deficiencies are discovered,and then an improved non-conformal normal contact force model is presented.To validate the accuracy of the presented model,three-dimensional refined finite element models employing surface-to-surface contact elements are constructed to simulate the normal contact of the revolute joint with different clearance sizes and different contact lengths.A comprehensive comparison is carried out between the semi-contact-width,contact pressure,and load-deformation curves obtained from the theoretical models and the finite element model.The results indicate that the presented contact force model outperforms the three classical contact force models in terms of accuracy.The differences between the ideal contact model and the real revolute joint are also investigated,and a sub-model modeling method is presented for the real revolute joint based on the ideal contact force model. 展开更多
关键词 Revolute joint Clearance Normal contact force model Non-conformal contact Three-dimensional finite element model
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A prediction model for axial installation force of interference-fit bolt in CFRP bolted joint and its deformation mechanism of contact interface at bolt-hole under static loading 认领 引用
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作者 Duquan ZUO Jie LIU +4 位作者 Yuejie CAO Minghao ZHANG Shaoqing JIN Yaoming FU Zengqiang CAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期631-642,共12页
This paper investigates the “brush-like”deformation phenomenon of the contact interface at the bolt-hole during the interference-fit installation of high-locking bolts under static loading in CFRP connection structu... This paper investigates the “brush-like”deformation phenomenon of the contact interface at the bolt-hole during the interference-fit installation of high-locking bolts under static loading in CFRP connection structures.An innovative theoretical model is proposed to predict axial installation force,specifically designed for moderate interference-fit.This model is based on the “brush-like”deformation of the hole wall,with the axial installation force predicted through force analysis and theoretical calculations,effectively overcoming the limitations of prior models that idealized the contact interface at the bolt-hole.The predictions generated by this theoretical model align closely with experimental data,confirming its efficacy in accurately forecasting the curve of installation force for interferencefit bolts during the static installation within the moderate interference-fit range.Additionally,a comprehensive analysis of the relationship between deformation of the hole wall and curves of installation force across small,moderate,and large interference-fit levels are presented.It is demonstrated that the degree of deformation within the moderate interference-fit range is more suitable than that in the small and large interference-fit ranges,making it a reliable alternative for installation force tests within this range during static installation.The moderate interference-fit domain[1.00%,1.24%]is established as a validated and optimal range of interference-fit bolts for the static installation. 展开更多
关键词 Axial installation force CFRP Contact interface Interference-fit bolt Predictive model
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Methodology for smooth-contact-modelling dynamic systems with angular inertia and energy dissipation:using a spinning top as a case study 认领 引用
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作者 Ra´ul Gismeros Moreno Jorge Gonz´alez Navarro +1 位作者 Jia Ma Eduardo Corral Abad 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第7期521-540,共20页
This work presents a methodology for modelling multibody systems with contact/impact events,considering angular inertia and energy dissipation,using a spinning top in contact with a flat surface as a case study.This s... This work presents a methodology for modelling multibody systems with contact/impact events,considering angular inertia and energy dissipation,using a spinning top in contact with a flat surface as a case study.This specific application is chosen due to its requirement for an extremely precise characterization of the contact interaction to ensure consistent results.The modelling process is carried out using smooth contact methods,incorporating the Hertz and Flores models for the normal force,and the Ambr´osio and Gonthier models for tangential friction.To propose this methodology,an analysis and comparison of different models of normal and tangential forces will be performed,aiming to identify their differences and determine which are more appropriate for the system under study.Additionally,the impact of a variable restitution coefficient solution proposed by Ma et al.on the system’s dynamics is evaluated.This model,which was developed and tested by a finite element method tool and experiments,is now integrated within the context of a multibody dynamics model.The analysis addresses the effect of contact modelling on the evolution of the motion and the stability of the top.The results show that models with dissipation accelerate the cessation of rebounds and generate tighter trajectories,while models without dissipation produce prolonged oscillations and wider trajectories.Moreover,the impact of model selection on computational cost is discussed. 展开更多
关键词 Contact modelling Friction Spinning top Multibody dynamics Gyroscopic effect
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Annealing-modulated localized contact at ITO/p-GaN interface for high-efficiency micro-LEDs at low current density 认领 引用
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作者 Ying Gu Mengyang Huang +6 位作者 Jie Zhou Zheyuan Hu Peng Zhang Min Jiang Jianjun Zhu Wenxian Yang Shulong Lu 《Journal of Semiconductors》 EI CAS CSCD 2026年第7期97-104,共8页
Achieving high emission efficiency at low current densities remains a challenge for micro-LEDs.Here,we demonstrate a controllable interfacial strategy by tuning the annealing temperature of RF-superimposed DC sputtere... Achieving high emission efficiency at low current densities remains a challenge for micro-LEDs.Here,we demonstrate a controllable interfacial strategy by tuning the annealing temperature of RF-superimposed DC sputtered ITO to modulate carrier injection dynamics.STEM analysis reveals 500℃ annealing triggers discrete substitutional In-atom incorporation into the p-GaN lattice,forming localized nanoscale contact regions.This architecture induces a localized carrier injection mechanism that significantly enhances the efficiency of micro-LEDs at low current densities.Specifically,the 500℃-annealed 10μm devices exhibit a dramatic enhancement in light output power(LOP),reaching 1.3×10-1 mW at 5 A/cm2,which is significantly higher than the 5.3×10-4 mW measured for 700°C-annealed devices.Furthermore,the peak efficiency current density(Jpeak)is dramatically shifted from 140 to 17 A/cm2 for 5μm devices.Capacitance-voltage analysis further corroborates the localized carrier injection mechanism.These findings establish contact interfacial modulation as a robust strategy for optimizing micro-LEDs in low-power display applications and tailoring device-level performance across broader optoelectronics. 展开更多
关键词 micro-LEDs gallium nitride indium tin oxide localized contact rapid annealing
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Comparative analysis of wheel-rail adhesion degradation and contact stress distribution on typical metro tracks 认领 引用
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作者 Tao Zhang Yunfan Yang +2 位作者 Liang Ling Yuedong Wang Kaiyun Wang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第2期287-309,共23页
Metro line has the characteristics of short station distance,low operating speed,frequent traction/braking,high acceleration and deceleration,small curve radius and various track types.The wheel-rail low adhesion beha... Metro line has the characteristics of short station distance,low operating speed,frequent traction/braking,high acceleration and deceleration,small curve radius and various track types.The wheel-rail low adhesion behavior,wear and damage problems are prominent under such a complicated operation condition.This article compares and analyzes the wheel-rail adhesion characteristic on four kinds of tracks,including the concrete slab bed track,steel-spring floating slab track,elastic support block track and trapezoidal sleeper track,revealing the adhesion degradation mechanism of metro wheel-rail system under different operating conditions,such as traction and braking.The results indicate that there are differences in the creepage response and the lowest limit of the wheel-rail adhesion coefficient on different track structures,while the maximum adhesion coefficient of the four track structures under traction/braking conditions shows a similar trend with the variation in speed and adhesion conditions.Traction and braking loads,as well as wheel-rail adhesion conditions,exert a relatively minor influence on the normal contact stress distribution of the wheel-rail interface,but significantly affect shear stress distributions.This study is shown to enhance the understanding of the combined effects of adhesion degradation and track types on the wheel-rail contact stress and surface damage. 展开更多
关键词 Metro track Adhesion degradation Contact stress Traction and braking Surface damage
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MXene-Based Wearable Contact Lenses: Integrating Smart Technology into Vision Care 认领 引用
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作者 Arezoo Khosravi Atefeh Zarepour +1 位作者 Ali Zarrabi Siavash Iravani 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第1期490-508,共19页
MXene-based smart contact lenses demonstrate a cutting-edge advancement in wearable ophthalmic technology,combining real-time biosensing,therapeutic capabilities,and user comfort in a single platform.These devices tak... MXene-based smart contact lenses demonstrate a cutting-edge advancement in wearable ophthalmic technology,combining real-time biosensing,therapeutic capabilities,and user comfort in a single platform.These devices take the advantage of the exceptional electrical conductivity,mechanical flexibility,and biocompatibility of two-dimensional MXenes to enable noninvasive,tear-based monitoring of key physiological markers such as intraocular pressure and glucose levels.Recent developments focus on the integration of transparent MXene films into the conventional lens materials,allowing multifunctional performance including photothermal therapy,antimicrobial and anti-inflammation protection,and dehydration resistance.These innovations offer promising strategies for ocular disease management and eye protection.In addition to their multifunctionality,improvements in MXene synthesis and device engineering have enhanced the stability,transparency,and wearability of these lenses.Despite these advances,challenges remain in long-term biostability,scalable production,and integration with wireless communication systems.This review summarizes the current progress,key challenges,and future directions of MXene-based smart contact lenses,highlighting their transformative potential in next-generation digital healthcare and ophthalmic care. 展开更多
关键词 MXenes Wearable contact lenses Intraocular lenses Drug delivery Wearable electronics
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Tantalum-Driven Interfacial Reconstruction Enables Ultra-Low Contact Resistance in TiAlTa/Au GaN HEMTs 认领 引用
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作者 Ji-Zhou Zhang Xiao-Yue Liu +6 位作者 Te Xu Jiang-Wen Wang Yuan-Hong Shi Shi-Dai Tian Xiang Zhang Wei-Guo Hu Jun-Yi Zhai 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期409-419,共11页
The transformative potential of gallium nitride high electron mobility transistors(GaN HEMTs)in advancing carbon-neutral power systems remains bottlenecked by contact resistance(Rc)at the metal-semiconductor(M-S)inter... The transformative potential of gallium nitride high electron mobility transistors(GaN HEMTs)in advancing carbon-neutral power systems remains bottlenecked by contact resistance(Rc)at the metal-semiconductor(M-S)interface,a critical determinant of switching losses and frequency response.Herein,by engineering a TiAl/TiAlTa/Au metastructure,we propose a novel interface-driven strategy employing Ta-mediated interfacial reconstruction to achieve a record-low Rc of 0.07Ωmm,which is two orders of magnitude lower than that of conventional Ti/Al/Ni/Au ohmic contacts.This innovation originates from expansion-bolt-like islands(shaped as inverted truncated pyramid—with extensive coverage and planar tops)formed during rapid thermal annealing(RTA)process,which are sufficiently dug into the two-dimensional electron gas(2DEG)channel.Distinct from traditional thumbtack-like morphology(resembling inverted cones),these expansion-bolt-like islands exhibit enhanced coverage to 2DEG channel,and planarized apex geometries that redistribute electric field,enabling 87%higher off-state breakdown voltage.This interface-driven strategy envisions a universal manufacturable paradigm for next-generation ultra-low-loss GaN power devices. 展开更多
关键词 contact resistance GaN HEMTs high-power density metal-semiconductor interface two-dimensional electron gas
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Quantitative investigation of well contact impact on single-event transient in sub-20 nm FinFET process 认领 引用
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作者 Qian Sun Bin Liang +12 位作者 Ya-Qing Chi Ming Tao Zhen-Yu Wu Hong-Xia Guo Wang-Yong Chen Jian-Jun Chen Peng-Cheng Huang Deng Luo Han-Han Sun Ya-Hao Fang Yu-Lin Gao Ming-Yan Ma Yang Guo 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第3期105-118,共14页
This paper quantitatively discusses the influence of well contact on single-event transient(SET)in sub-20 nm FinFET by two-photon absorption(TPA)pulse laser.Two groups of inverter chains were designed to investigate t... This paper quantitatively discusses the influence of well contact on single-event transient(SET)in sub-20 nm FinFET by two-photon absorption(TPA)pulse laser.Two groups of inverter chains were designed to investigate the impact of well contact distance on the FinFET process.The experimental results show that the SET pulse width has a bimodal symmetric distribution,which is different from that of a bulk planar CMOS device.To investigate the detailed mechanism of the phenomenon,a high-precision FinFET TCAD model was established,in which both Id-Vd and Id-Vg errors were less than 10%compared to the SPICE model provided by the commercial process.TCAD simulation under heavy ion injection showed the mechanism of the abnormal phenomenon,where the well contact plays a major role in charge collection at the near-well contact distance,while the source plays a major role at the far distance.This phenomenon is completely different from that of planar CMOS devices.This indicates that the SET mechanism becomes more complicated during the FinFET process.Therefore,more effective SET hardening methods should be investigated for FinFET. 展开更多
关键词 FinFET Single-event transient(SET) Well contact distance Pulse laser
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Thermodynamic real-time coupling modeling and thermal characteristic analysis of angular contact ball bearings under combined loads 认领 引用
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作者 Wenbing Tu Yuankuo Lou +1 位作者 Chenlu Liu Wennian Yu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期518-534,共17页
The distribution of heat generation and operating temperature are crucial factors affecting the performance and useful service life of angular contact ball bearings.A thermodynamic real-time coupling analytical model ... The distribution of heat generation and operating temperature are crucial factors affecting the performance and useful service life of angular contact ball bearings.A thermodynamic real-time coupling analytical model is established in this work to illustrate alterations in the bearing structure,internal load,and the sliding and rotation of the ball correlated with temperature fluctuations.The temperature rise and heat generation of angular contact ball bearings under combined loads are accurately calculated.The simulation of the temperature rise in bearings is conducted based on this model,and the effectiveness of the model is validated through simulation experiments.The simulation results of the distribution of heat generation are compared between thermodynamic real-time coupling and thermodynamic sequential coupling,with a focus on the transient thermal characteristics of bearings and the effect of load on their steady-state thermal characteristics.The precision of temperature simulation through thermodynamic real-time coupling is significantly higher than that through thermodynamic sequential coupling.Axial load mainly affects heat generated by the sliding and rotation of the ball on the inner raceway,while radial load predominantly affects the heat generation of the ball due to sliding on the inner and outer raceways.The findings of the work can guide the design and performance evaluation of angular contact ball bearings and provide support for temperature simulation. 展开更多
关键词 Angular contact ball bearings Combined loads Thermodynamic real-time coupling Thermal characteristics
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Preparation of Polyethylene Glycol-Modified Silicone Hydrogel Contact Lenses for Enhanced Sodium Hyaluronate Delivery 认领 引用
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作者 ZHANG Xiaojuan WANG Zhao +7 位作者 ZHOU Yao ZHANG Caiyu LI Yu ZHANG Changqing ZHAO Yuan LIN Qing SONG Wenli LIANG Dong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期846-855,共10页
To address the limitations of traditional silicone hydrogel contact lenses in wettability and drug release,an innovative approach was proposed by incorporating polyethylene glycol(PEG)and sodium hyaluronate(SH)into th... To address the limitations of traditional silicone hydrogel contact lenses in wettability and drug release,an innovative approach was proposed by incorporating polyethylene glycol(PEG)and sodium hyaluronate(SH)into these lenses.Aminoalkyl-terminated polydimethylsiloxane(KF8010)was reacted with glycidyl methacrylate(GMA)to synthesize GKF8010,which was then mixed with methacryloxymethyltris(trimethylsiloxy)silane(TRIS),N,N-Dimethylaniline(DMA),and PEG400 to fabricate PEG-modified silicone hydrogel contact lenses(PEG-SCL)via UV molding.Unmodified lenses(SCL)were served as controls.The effects of PEG modification on lens properties,including water content,wettability,and optical clarity,and SH loading efficiency and drug release were evaluated.Additionally,the protein adsorption and biocompatibility of the lenses with human umbilical vein endothelial cells(HUVECs)were assessed.Results indicated that PEGmodified lenses exhibited superior water content,reduced protein adsorption,enhanced SH loading capacity and controlled release profiles,highlighting their potential for treating dry eye syndrome. 展开更多
关键词 silicone hydrogel contact lenses PEG modification sodium hyaluronate dry eye syndrome
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Transmission Characteristics of Biological Pollutant on Cold Surface Through Surface Contact During Cold Storage 认领 引用
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作者 Zhiqiang Wang Lixin Chen +3 位作者 Saiwei Ge Wei Xiao Zhuohao Xuan Pengcheng Zhang 《Journal of Harbin Institute of Technology(New Series)》 CAS 2026年第1期20-32,共13页
The cold chain environment is an important route for the long⁃distance transmission of pathogenic micro⁃organisms.In this study,we explored the mechanisms of secondary propagation through surface contact on cold surfa... The cold chain environment is an important route for the long⁃distance transmission of pathogenic micro⁃organisms.In this study,we explored the mechanisms of secondary propagation through surface contact on cold surfaces.A quantitative statistical experimental method was adopted to study the surface⁃contact transmission of micro⁃organisms,wherein the transfer rate of surface contact was the dependent variable and Escherichia coli was used as the indicator bacterium.The effects of contact pressure(0.44,0.86,1.55,2.25,and 2.94 N/cm2),contact time(0,15,30,45,and 60 s),contact angle(15°and 25°),and surface materials(rubber and cotton gloves)were measured at two storage temperatures:cold storage(5℃)and freezing(-18℃).The results showed that as temperature decreases,the transfer of micro⁃organisms through surface contact becomes less probable.The contact time did not significantly influence the transfer rate of micro⁃organisms when items were handled at cold⁃storage temperatures.Based on these results,we recommend placing items as flat as possible to minimize the tilt angle when handling them at cold⁃storage temperatures.Additionally,if the tilt angle cannot be avoided,rubber gloves should be used when handling items stored at large tilt angles,whereas cotton gloves may be used for items placed at smaller angles. 展开更多
关键词 cold chain biological pollutant surface contact transfer rate transmission characteristics
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High-efficiency theoretical model for predicting contact forces and deformations in threaded connections under complex loading 认领 引用
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作者 Zhao Liu Zeyu Qi +1 位作者 Xuefeng Wang Caishan Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期490-503,共14页
Threaded connection is a common structural form in mechanical engineering,with their complex nonlinear behavior under combined loading critically affecting structural performance.While existing simplified models and f... Threaded connection is a common structural form in mechanical engineering,with their complex nonlinear behavior under combined loading critically affecting structural performance.While existing simplified models and finite element analysis(FEA)methods describe force distribution under single loading conditions,accurately modeling threaded connections under complex loading remains challenging.This paper proposes a simplified theoretical model to efficiently predict contact forces and deformation distributions under tension,torsion,bending,and shear.The model treats bolt and nut bodies as Euler-Bernoulli beams and represents thread stiffness using equivalent trapezoidal cantilever beams,reducing computational complexity while retaining essential mechanical characteristics.The paper introduces reference helical curves and derives a deformation coordination relationship based on contact constraints.The model’s calculations are validated against FEA results,demonstrating both high precision and significant computational efficiency under complex loading conditions.This work provides an efficient and reliable tool for analyzing threaded connections,offering promising engineering applications. 展开更多
关键词 Thread connection Contact force distribution Deformation coordination relationship Theoretical modeling Finite ele-ment analysis
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Investigation of Oil-air Two-Phase Flow Inside Angular Contact Ball Bearing with Textured Cage 认领 引用
19
作者 WANG Baomin FANG Wenbo +1 位作者 YAN Ruixiang QIAN Sikai 《Journal of Shanghai Jiaotong university(Science)》 EI 2026年第2期528-536,共9页
Surface texture technology is a method to improve the tribological properties of friction pairs.In this study,a cylindrical texture is designed in cage pocket,and then the volume of fluid model and the multireference ... Surface texture technology is a method to improve the tribological properties of friction pairs.In this study,a cylindrical texture is designed in cage pocket,and then the volume of fluid model and the multireference frame method are used to investigate the oil volume fraction inside the bearing cavity,the pressure and oil distribution on the ball surface,and the oil distribution on the inner/outer raceway.The results show that the cylindrical texture in cage pocket is helpful to increase the oil volume fraction inside the bearing cavity,improve the pressure distribution on the ball surface,and increase the oil content on the ball surface.The cage pocket texture helps the ball to carry more lubrication oil in the high-speed rotation process,which increases the oil content of the outer raceway and improves the oil-air lubrication effect of the ball.This study proposes a new texture arrangement in cage pocket of angular contact ball bearings,and introduces the mixed mesh method to divide the fluid domain of bearing.Through comparative study,the cage pocket texture is helpful to improve the oil-air lubrication efficiency. 展开更多
关键词 angular contact ball bearing surface texture cage air-liquid two-phase flow
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Mechanism and Mitigation of Local Rolling Contact Fatigue in Metro Wheels 认领 引用
20
作者 LIU Yongfeng WANG Xiaohua +2 位作者 ZHOU Mingxue PU Anhui SUN Xiaojuan 《摩擦学学报（中英文）》 EI CAS CSCD 北大核心 2026年第5期834-845,共12页
Shortly after the commencement of service operations,a distinct form of localized rolling contact fatigue(RCF)was identified on the wheels of a metro line.Field investigations revealed that most fatigue damage measure... Shortly after the commencement of service operations,a distinct form of localized rolling contact fatigue(RCF)was identified on the wheels of a metro line.Field investigations revealed that most fatigue damage measured less than 10 cm in length and 1.5 cm in width,accompanied by significant material spalling and flaking.These defects were found to be distributed exclusively around the flange root and the region outside the nominal rolling circle,with approximately 78.6%concentrated at the flange root.Furthermore,trailer wheels exhibited a markedly higher incidence of RCF compared to motor wheels.To elucidate the underlying failure mechanism,a multibody dynamics model of the metro vehicle was established using SIMPACK,with numerical simulations performed based on actual track geometry and operational data.The analysis indicated that the line contained numerous small-radius curves.Lubricators installed along the high rail in these curves contaminated the rail surface,leading to a significant reduction in the adhesion coefficient on that side.When trains were braked while negotiating curves-particularly at stations located on such curves-the resulting low-adhesion conditions induced localized RCF on the wheels on the high-rail side.Additionally,the decreased adhesion on the high-rail side caused increased tread wear on the wheels of the low-rail side,which further promoted fatigue damage initiation at the flange root.The higher incidence of RCF on trailer wheels was attributed to two primary factors.First,as the leading wheelset,the trailer wheels were the first to contact the oil-contaminated rail,thereby experiencing the most severe adhesion degradation.Second,motor wheels generally exhibited higher tread wear rates,which helped to remove incipient surface cracks before they could develop into macroscopic RCF damage.By implementing a regimen of regular cleaning to remove oil contamination from both rail surfaces and wheel flanges,the wheel-rail adhesion conditions were substantially improved.This intervention effectively suppressed the occurrence of the localized rolling contact fatigue problem. 展开更多
关键词 metro local rolling contact fatigue field investigation low adhesion dynamics simulation
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