摘要：This study investigates surface erosion wear caused by collision and friction between propellers and sand particles during the flight of propeller transport aircraft in harsh environments like deserts and plateaus,which are characterized by strong sand and wind ***,the erosion behavior of individual propeller blades is analyzed under various sand particle parameters using the commercial software ***,dynamic simulations of the entire blade are conducted by the sliding mesh method to examine erosion patterns under different operational conditions,including rotation speed and climb ***,the impact of erosion on the aerodynamic characteristics of the propeller is obtained based on simulation *** study delves into the erosion patterns observed in large aircraft propellers operating within sandy and dusty environments,as well as the consequential impact of propeller surface wear on aerodynamic *** elucidating these phenomena,this research provides valuable insights that can inform future endeavors aimed at optimizing propeller design.

摘要：The low temperature,high salt content,and bacterial composition of a seawater environment can induce severe infections in open wounds,thus impeding wound *** date,numerous wound dressings have been developed for injuries and various antibacterial ***,ordinary antibacterial strategies could not provide long-term resistance to infections and could not promote wound ***,we proposed a strategy for enhancing resistance to seawater immersion wound infection by killing bacteria and delivering bacterial antigens in ***,MXene-embedded tannin-Eu^(3+)(M@TA-Eu)particles were constructed to effectively alleviate injuries infected through seawater immersion and persistently fight infection by forming in situ bacterial vaccines and immune *** the particle,the platform composed of TA and Eu3+exhibited provascularization and antigen presentation *** with near-infrared photothermal effect were introduced to kill the bacteria,promote the recruitment of antigen presentation cells,and ultimately enhance vaccination *** results showed that the particles not only effectively accelerated the healing of injuries by relieving wound inflammation and inhibiting bacteria but also produced a potent vaccination by forming in situ bacterial ***,the M@TA-Eu particles are novel materials for high-grade anti-infection dressing.

摘要：The development of low-cost,highly active platinum(Pt)-based electrocatalysts for oxygen reduction reaction(ORR)is crucial for widespread applications of fuel *** effective approach lies in alloying Pt with non-noble transition metals to modulate the physicochemical state of the Pt ***,fundamental challenges remain in understanding the structure-performance relationship due to the complexity of composition,crystal type,and surface structure during the alloying *** this study,we synthesized a series of PtCo bimetallic solid solutions with varying ratios using a liquid-phase synthesis *** exploiting the characteristics of solid solutions,the resulting PtCo bimetallic alloy maintains the face-centered cubic crystal structure of pure platinum,minimizing the complexities introduced during alloying and facilitating mechanism ***,under controlled alloy composition and crystal structure,we investigated the dependence of the electrocatalytic activity for the oxygen reduction reaction on the surface strain of the platinum *** S-PtCo-SNPs cathode designed accordingly endows both proton exchange membrane fuel cell(PEMFC)(2.08 W cm^(−2) at 4 A cm^(−2))and Zn-air battery(ZAB)(143.1 mW cm^(−2) at 214.5 mA cm^(−2))with outstanding performance.

摘要：In clinical settings,tantalum(Ta)is extensively implemented as a bone implant *** is highly stable and biocompatible in vivo,being one of the metallic biomaterials having high affinity for bone ***,since Ta is a refractory metal,its application as bone implant material is *** recently,additive manufacturing technology has introduced a novel approach to producing Ta *** present study compared the microstructure,surface and mechanical characteristics,and in vitro and in vivo biological characteristics of selective laser melted Ta(SLM Ta),selective laser melted titanium alloy Ti6Al4V with Ta coating(SLM Ti6Al4V with Ta coating),and selective laser melted Ti6Al4V(SLM Ti6Al4V).Results indicate that SLM Ta possesses superior mechanical characteristics contrasted with SLM Ti6Al4V and SLM Ti6Al4V with Ta ***,SLM Ta has anti-inflammatory activity,excellent osseointegration performance,and osteogenic *** fabricated an SLM porous Ta bone plate and employed it for internal fixation of ulnar and radius fractures,which has been known to promote fracture ***,the SLM porous Ta bone plate could form an integrated bone plate structure with the bone tissue at the implant ***,the porous structure of the plate minimizes its elastic modulus and eliminates stress shielding,leaving no need for further surgical *** conclusion,the SLM porous Ta bone plate meets the performance requirements(stimulating bone regeneration,non-stress shelter,and no need for second surgery)of an ideal bone plate and may revolutionize the field of internal fixation bone plates for fractures.

摘要：Complex network models are frequently employed for simulating and studyingdiverse real-world complex *** these models,scale-free networks typically exhibit greater fragility to malicious ***,enhancing the robustness of scale-free networks has become a pressing *** address this problem,this paper proposes a Multi-Granularity Integration Algorithm(MGIA),which aims to improve the robustness of scale-free networks while keeping the initial degree of each node unchanged,ensuring network connectivity and avoiding the generation of multiple *** algorithm generates a multi-granularity structure from the initial network to be optimized,then uses different optimization strategies to optimize the networks at various granular layers in this structure,and finally realizes the information exchange between different granular layers,thereby further enhancing the optimization *** propose new network refresh,crossover,and mutation operators to ensure that the optimized network satisfies the given ***,we propose new network similarity and network dissimilarity evaluation metrics to improve the effectiveness of the optimization operators in the *** the experiments,the MGIA enhances the robustness of the scale-free network by 67.6%.This improvement is approximately 17.2%higher than the optimization effects achieved by eight currently existing complex network robustness optimization algorithms.

摘要：Bone defects have serious economic and clinical impacts;however,despite improvements in bone defect management,the range of clinical outcomes remains limited.A variety of biomaterials have been used to treat complex bone ***,final bone repair outcomes may be adversely affected by poor osteogenic capacity and risk of ***,therapeutic methods are required that reduce bacterial contamination and increase the use of osteogenic ***,we report the preparation of poly(lactic acid-coglycolic acid)(PLGA)microspheres coloaded with magnesium(Mg^(2+))and gallium(Ga^(3+))ions(Mg-Ga@PLGA),which can fill irregular bone defects and show good *** in vitro testing,Mg-Ga@PLGA not only showed a synergistic effect on promoting osteogenic differentiation but also inhibited osteoclastic ***,we found that Mg-Ga@PLGA demonstrated an antibacterial *** in vivo testing,Mg Ga@PLGA exhibited strong in situ osteogenic *** conclusion,Mg-Ga@PLGA has good potential for treating bone defects at risk of infection.

摘要：Wireless millirobots engineered to infiltrate intricate vascular networks within living organisms,particularly within constricted and confined spaces,hold immense promise for the future of medical ***,with their multifaceted and intricate designs,some robots often grapple with motion and functionality issues when confronted with tight spaces characterized by small cross-sectional *** this study,drawing inspiration from the high aspect ratio and undulating swimming patterns of snakes,a millimeter-scale,snake-like robot was designed and fabricated via a combination of extrusion-based four-dimensional(4D)printing and magnetic-responsive intelligent functional inks.A sophisticated motion control strategy was also developed,which enables the robots to perform various dynamic movements,such as undulating swimming,precise turns,graceful circular motions,and coordinated cluster movements,under diverse magnetic field *** a potential application,the snake robot can navigate and release drugs in a model coronary intervention vessel with tortuous channels and fluid *** novel design and promising applications of this snake robot are invaluable tools in future medical surgeries and interventions.

摘要：Arrhythmogenic right ventricular cardiomyopathy(ARVC)is a progressive disease characterized by adipose and fibrous replacement of the *** elevated testosterone levels have been implicated in the pathological process of ARVC,its exact contribution to cardiac fibrosis in ARVC remains *** this study,we analyzed the potential contribution of gender-based differences on the distribution of the low-voltage area in an ARVC cohort undergoing an electrophysiological study,which was indicated by feature ***,we established engineered cardiac spheroid models in vitro using patient-specific induced pluripotent stem cell(iPSC)-derived cardiomyocytes(iPSC-CMs)and iPSC-derived cardiac fibroblasts(icFBs).We elucidated the pathogenicity of abnormal splicing in the plakophilin-2(PKP2)gene caused by an intronic ***,pathogenic validation of the desmoglein-2(DSG2)point mutation further confirms the reliability of the ***,testosterone exacerbated the DNA damage in the mutated cardiomyocytes and further activated myofibroblasts in a chain *** conclusion,we designed and constructed an in vitro three-dimensionally-engineered cardiac spheroid model of ARVC based on clinical findings and provided direct evidence of the fibrotic role of testosterone in ARVC.

摘要：Zero-dimensional perovskite materials,characterized by broadband emission caused by self-trapped excitons,are promising materials for stimuli-responsive and photo-writeable ***,existing research is focused on the effects of structural phase transitions on photophysical properties,and lacks in-depth understanding of the mechanisms of self-trapped excitons ***,we demonstrate that the dehydration reaction in zero-dimensional antimony halide clusters significantly enhances the self-trapped excitons emission without inducing structural phase transition,resulting in a substantial increase in photoluminescence(PL)quantum yield from 3.5%to 91.4%.In-situ X-ray diffraction and PL techniques were employed to shed light on the relationship between the crystal structure and radiative recombination,demonstrating the introduction of rich lattice distortion during the dehydration ***-dependent PL spectra and transient absorption spectra suggest that the lattice distortion causes the moderate electron-phonon coupling strength and high exciton binding energy,facilitating self-trapped excitons to relax from the non-radiative recombination singlet state to the radiative recombination triplet state,corresponding to the enhanced emission *** a proof of concept,several switchable PL applications have been established in scenarios such as anti-counterfeiting,rewritable luminescent paper,and humidity *** finding elucidates the emission mechanism of self-trapped excitons and provides a novel avenue for designing switchable luminescent materials.

摘要：With reference to the characteristics of plant blade vein distribution, a new wind turbine blade layup design approach is developed by taking advantage of the similarity between plant leaf veins and blade structural functions in order to cope with the high structural performance demand given by the large-scale wind turbine blade. Using computational fluid dynamics and the finite element approach, the modal, structural strength and stability analyses of the bionic blade are carried out. The results show that: compared with the traditional blade, the intrinsic frequency of the bionic blade is increased and the torsional characteristics are stronger. The tip displacement of the bionic blade is greatly reduced, and the surface stress value is reduced, but the web stress is increased. The first six orders of flexion factors of the bionic blade are all increased compared to the conventional blade, suggesting that the plant leaf vein structure is beneficial for improving blade stability. ©2025 *** ***.