Developing advanced stealth devices to cope with radar-infrared(IR)fusion detection and diverse application scenarios is increasingly demanded,which faces significant challenges due to conflicting microwave and IR clo...Developing advanced stealth devices to cope with radar-infrared(IR)fusion detection and diverse application scenarios is increasingly demanded,which faces significant challenges due to conflicting microwave and IR cloaking mechanisms and functional integration limitations.Here,we propose a multiscale hierarchical structure design,integrating wrinkled MXene IR shielding layer and flexible Fe_(3)O_(4)@C/PDMS microwave absorption layer.The top wrinkled MXene layer induces the intensive diffuse reflection effect,shielding IR radiation signals while allowing microwave to pass through.Meanwhile,the permeable microwaves are assimilated into the bottom Fe_(3)O_(4)@C/PDMS layer via strong magneto-electric synergy.Through theoretical and experimental optimization,the assembled stealth devices realize a near-perfect stealth capability in both X-band(8–12 GHz)and long-wave infrared(8–14μm)wavelength ranges.Specifically,it delivers a radar cross-section reduction of−20 dB m^(2),a large apparent temperature modulation range(ΔT=70℃),and a low average IR emissivity of 0.35.Additionally,the optimal device demonstrates exceptional curved surface conformability,self-cleaning capability(contact angle≈129°),and abrasion resistance(recovery time≈5 s).This design strategy promotes the development of multispectral stealth technology and reinforces its applicability and durability in complex and hostile environments.展开更多
This study aims to achieve a synergy of strength and ductility in magnesium-based nanocomposite materials through the design of a dual-heterostructure. Utilizing ball milling and hot extrusion, a nano-TiC/AZ61 composi...This study aims to achieve a synergy of strength and ductility in magnesium-based nanocomposite materials through the design of a dual-heterostructure. Utilizing ball milling and hot extrusion, a nano-TiC/AZ61 composite featuring particle-rare coarse grain (CG) and particle-rich fine grain (FG) zones was successfully fabricated. Experimental results demonstrated that compared with the homogeneous structure, the dual-heterostructure composite achieved a significant increase in elongation by 116 % and a remarkable 165 % improvement in the strength-ductility product (SDP), while maintaining a high ultimate tensile strength (UTS) of 417±4 MPa. This substantial performance enhancement is primarily attributed to the additional strain hardening induced by hetero-deformation-induced (HDI) strain hardening and crack-blunting capabilities, as elucidated by microstructural characterization and crystal plasticity finite element modeling (CPFEM). Notably, the strain hardening contribution from the CG zones at the early stage of deformation (≤ 45 % of total plastic deformation amount) is minimal but increases significantly during the subsequent deformation stages. The dislocation increment rate in CG zones (219 %) is observed to be more than double that in FG zones (95 %), attributed to the large grain size and low dislocation density in CG zones, which provide more space for dislocation storage. In addition, the aggravated deformation inhomogeneity as deformation progresses leads to an increase in geometrically necessary dislocations (GNDs) generation near the heterogeneous interface, thereby enhancing HDI hardening. Fracture mechanism analysis indicated that the cracks mainly initiate in the FG region and are effectively blunted upon their propagation to the CG region, necessitating increased energy consumption and indicating higher fracture toughness for the dual-heterostructure composites. This study validates the effectiveness of the dual-heterostructure design in magnesium-based composites, providing a novel understanding of the deformation mechanism through both experimental analysis and CPFEM, paving the way for the development of high-performance, lightweight structural materials.展开更多
A solid solution 6063 aluminium alloy features an exceptional combination of strength and ductility at 77 K.Here,the deformation mechanisms responsible for superior strength-ductility synergy and excellent strain hard...A solid solution 6063 aluminium alloy features an exceptional combination of strength and ductility at 77 K.Here,the deformation mechanisms responsible for superior strength-ductility synergy and excellent strain hardening capacity at a cryogenic temperature of the alloy were comparatively investigated by insitu electron backscatter diffraction(EBSD)observations coupled with transmission electron microscopy(TEM)characterization and fracture morphologies at both 298 and 77 K.It is found that kernel average misorientation(KAM)mappings and quantified KAM in degree suggest a higher proportion of geometrically necessary dislocations(GNDs)at 77 K.The existence of orientation scatter partitions at 77 K implies the activation of multiple slip systems,which is consistent with the results of potential slip systems calculated by Taylor axes.Furthermore,dislocation tangles characterized by brief and curved dislocation cells and abundant small dimples have been observed at 77 K.This temperature-mediated activation of dislocations facilitates the increased dislocations,thus enhancing the strain hardening capacity and ductility of the alloy.This research enriches cryogenic deformation theory and provides valuable insights into the design of high-performance aluminium alloys that are suitable for cryogenic applications.展开更多
The application of machine learning in alloy design is increasingly widespread,yet traditional models still face challenges when dealing with limited datasets and complex nonlinear relationships.This work proposes an ...The application of machine learning in alloy design is increasingly widespread,yet traditional models still face challenges when dealing with limited datasets and complex nonlinear relationships.This work proposes an interpretable machine learning method based on data augmentation and reconstruction,excavating high-performance low-alloyed magnesium(Mg)alloys.The data augmentation technique expands the original dataset through Gaussian noise.The data reconstruction method reorganizes and transforms the original data to extract more representative features,significantly improving the model's generalization ability and prediction accuracy,with a coefficient of determination(R^(2))of 95.9%for the ultimate tensile strength(UTS)model and a R^(2)of 95.3%for the elongation-to-failure(EL)model.The correlation coefficient assisted screening(CCAS)method is proposed to filter low-alloyed target alloys.A new Mg-2.2Mn-0.4Zn-0.2Al-0.2Ca(MZAX2000,wt%)alloy is designed and extruded into bar at given processing parameters,achieving room-temperature strength-ductility synergy showing an excellent UTS of 395 MPa and a high EL of 17.9%.This is closely related to its hetero-structured characteristic in the as-extruded MZAX2000 alloy consisting of coarse grains(16%),fine grains(75%),and fiber regions(9%).Therefore,this work offers new insights into optimizing alloy compositions and processing parameters for attaining new high strong and ductile low-alloyed Mg alloys.展开更多
With the continuous advancement of cancer treatment methods, plasma combined with drug therapy has garnered widespread attention as an emerging therapeutic strategy. This paper elaborates on the generation and charact...With the continuous advancement of cancer treatment methods, plasma combined with drug therapy has garnered widespread attention as an emerging therapeutic strategy. This paper elaborates on the generation and characteristics of plasma, as well as its mechanisms of action on cancer cells when used alone, including the production of reactive oxygen and nitrogen species, and damage to cancer cell membranes, and organelles. It emphasizes the synergistic mechanisms observed when plasma is combined with various anticancer drugs (e.g., chemotherapeutic agents, targeted drugs, and immunotherapies). The analysis focuses on enhancing drug uptake, promoting the activation of drug action targets, and improving the tumor microenvironment. These insights provide a theoretical basis for optimizing plasma-drug combination therapy for cancer.展开更多
In this study,a novel strategy for breaking the strength-ductility dilemma of Mg-1.5Zn-0.6Gd(wt%)alloy via solute segregation was reported.The hot extruded alloy sheet was subjected to rolling deformation,and then hea...In this study,a novel strategy for breaking the strength-ductility dilemma of Mg-1.5Zn-0.6Gd(wt%)alloy via solute segregation was reported.The hot extruded alloy sheet was subjected to rolling deformation,and then heat-treated at 200℃.The high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)reveals a remarkable segregation of solute Zn atoms along both high and lowangle grain boundaries(GBs).As compared with as-rolled plate,the yield strength,ultimate tensile strength,and the elongation of annealed sample is increased by 15.6%,14%,and 8.4%,respectively,acquiring an obvious strength-ductility synergy effect.The solute segregation endows the rolled plate with excellent grain size stability and provides a prominent extra solute cluster strengthening,which completely resists the other softening effects including dislocation annihilation and grain coarsening.Meanwhile,the directional migration of Zn atoms and the annihilation of dislocations provide a"clear"space within the grain,which is beneficial for the moving and accumulating of subsequent dislocations.This work sheds light on the solute partitioning behavior and realizes a good application of GB segregation in improving the comprehensive mechanical properties of Mg alloys.展开更多
Titanium alloys engineered in structural applications achieve ultrahigh strength primarily through precipitation strengthening of secondary α-phase(αs)during aging,while they often experience compromised ductility a...Titanium alloys engineered in structural applications achieve ultrahigh strength primarily through precipitation strengthening of secondary α-phase(αs)during aging,while they often experience compromised ductility and toughness due to traditional strength-toughness tradeoff.In this study,we propose a novel strategy to address this conflict by introducing deformation kinks prior to conventional cold rolling(CR)and aging processes.These kinks are produced by cold forging(CF)to create macroscopic lamellar structures in β-grains,which alter strain partitioning during subsequent CR and ultimately tailor α_(s)-precipitation upon aging.As a result,an ultrafine duplex(αe+β)-structure is formed within kink interi-ors,while hierarchicalαs-precipitates are generated in the external β-matrix.This unique microstructure effectively enhances dislocation activity,promotes uniform plastic strain distribution and impedes crack propagation.Consequently,a simple Ti-V binary titanium alloy exhibits exceptional properties with ultra-high strength∼1636 MPa,decent ductility∼5.4% and appreciable fracture toughness∼36.1 MPa m^(1/2).The synergetic properties surpass those obtained through traditional CR and aging processes for the alloy and even outperform numerous multielement engineering titanium alloys reported in literature.Our findings open up a new avenue for overcoming the strength-toughness tradeoffof ultrahigh-strength titanium alloys,and also offer a facile production route towards structural materials for advanced performance.展开更多
BACKGROUND The upsurge of antibiotic resistance is a significant challenge to public health,and the dry pipeline of new antibiotics has prompted the discovery of alternative treatment approaches.Enterococcus faecalis(...BACKGROUND The upsurge of antibiotic resistance is a significant challenge to public health,and the dry pipeline of new antibiotics has prompted the discovery of alternative treatment approaches.Enterococcus faecalis(E.faecalis)isolates are often multidrugresistant,posing challenges to antibiotic therapy.Bacteriophage therapy is being explored as an alternative method to treat the growing population of antibioticresistant infections.Nevertheless,many inherent limitations of phages diminish their therapeutic utility,notably the restricted host range and quick development of mutants.The specific types and quantities of bacteriophages and antibiotics may be crucial in generating the optimal phage-antibiotic synergy.AIM To optimize the doses,order,and timing to optimize the synergy of phages and vancomycin on different bacteria states.METHODS A volume of 180μL of E.faecalis bacteria in the logarithmic growth phase,with a concentration of approximately 1×10^(8)colony forming units(CFUs)/mL,was introduced onto a microtitre plate.Subsequently,20μL of phage suspension(1×10^(6)PFUs/mL),vancomycin(16μg/mL),or a combination of both was introduced into the designated wells in the specified sequence and incubated at 37°C for 48 hours.The number of live bacteria was counted at different time points using standardized CFU counting protocols.RESULTS The biofilm model demonstrated that combining phages with vancomycin can eradicate the biofilm.Sequential therapy,involving phage application 8 hours before the antibiotic at a concentration of 108 PFUs/mL,proved the most efficient in eliminating the biofilms and killing the planktonic form of E.faecalis.CONCLUSION The combination of phageɸEFP01 at a higher concentration with a subinhibitory concentration of vancomycin yields a synergistic antibacterial outcome on E.faecalis strain resistant to vancomycin.展开更多
In this work,the GW63K(Mg-6.54Gd-3.93Y-0.41Zr,wt.%)alloy wire was utilized as the feedstock material and the thin-walled component was fabricated using wire-arc additive manufacturing technology(WAAM).The microstructu...In this work,the GW63K(Mg-6.54Gd-3.93Y-0.41Zr,wt.%)alloy wire was utilized as the feedstock material and the thin-walled component was fabricated using wire-arc additive manufacturing technology(WAAM).The microstructural evolution during deposition and subsequent heat treatment was explained through multi-scale microstructural characterization techniques,and the impact of heat treatment on the strengthductility synergy of the deposited alloy was systematically compared.The results showed that the microstructure of the deposited sample was mainly composed of fine equiaxedα-Mg grains and Mg_(24)(Gd,Y)_(5) phase.The optimized solution heat treatment(450℃×2 h)had little effect on the grain size,but can effectively reduce the Mg_(24)(Gd,Y)_(5) eutectic phase on the grain boundary,resulting in a significant increase in elongation from 13.7% to 26.6%.After peak-aging treatment,the strength of the GW63K alloy increased to 370 MPa,which was significantly higher than the as-built state(267 MPa).The superior strength in this study is attributed to the refinement strengthening imparted by the fine microstructure inherited in the as-built GW63K alloy,as well as the precipitation strengthening due to the formation of dense β’precipitates with a pronounced plate-like aspect ratio.展开更多
The synergy of single atoms(SAs)and nanoparticles(NPs)has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction(CO_(2)RR);however,the rationalization of the SAs/NPs proportio...The synergy of single atoms(SAs)and nanoparticles(NPs)has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction(CO_(2)RR);however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst design.Herein,a Ni2+-loaded porous poly(ionic liquids)(PIL)precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing temperature.The catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO_(2)into CO.Operando Ni K-edge X-ray absorption near-edge structure(XANES)spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and NPs.The charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active sites.In the electroreduction of CO_(2),the coexistence of Ni SAs and NPs strengthened the CO_(2)activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO_(2)→*COOH step,and therefore promoted the catalysis efficiency.展开更多
With prolonged exposure in the human body,titanium alloy implants face challenges associated with bacterial attachment and proliferation,leading to implant failure and severe complications.Photothermal therapy(PTT)eme...With prolonged exposure in the human body,titanium alloy implants face challenges associated with bacterial attachment and proliferation,leading to implant failure and severe complications.Photothermal therapy(PTT)emerges as an efficient strategy for biofilm elimination.However,the local high temperature of PTT and incomplete bacteria ablation in low-temperature PTT pose risks of damage to normal tissues and biofilm recalcitrance,respectively.In this study,we synergistically combined photothermal therapy and chemotherapy to mildly disrupt biofilms of Staphylococcus aureus(S.aureus)to enhance the efficiency of biofilm ablation.The synergistic nanoplatform comprises near-infrared-light responsive con-jugated polymers,heat-sensitive liposomes,and the antibiotic daptomycin for biofilm elimination.The heat generated by conjugated polymers,stimulated with 808 nm light,alters biofilm permeability and releases antibiotics locally to eradicate biofilm.The nanoparticles exhibit biofilm dispersion activity and can effectively inhibit biofilm growth for up to 5 days.Consequently,this nanoplatform based on conjugated polymers offers a reliable method for ablating biofilms on titanium alloy implant and exhibits potential in drug-resistant clinical applications.展开更多
Objective:To explore the experiences of palliative care multidisciplinary teams from the perspective of pluralistic synergy theory,aiming to enhance team collaboration.Method:Utilizing a qualitative research methodolo...Objective:To explore the experiences of palliative care multidisciplinary teams from the perspective of pluralistic synergy theory,aiming to enhance team collaboration.Method:Utilizing a qualitative research methodology,we conducted in-depth interviews with 15 palliative care team members to collect data.Results:The operational framework of palliative care multidisciplinary teams under pluralistic synergy theory involves:enhancing collaboration among team members;developing a comprehensive management model for the team;rationalizing the allocation of work tasks and durations;improving team communication and interaction through effective communication mechanisms and platforms;cultivating skilled professionals;and establishing a robust health record management system.Conclusion:The operational mechanism,informed by pluralistic synergy theory,advances the development of palliative care.展开更多
Artificial multisensory devices play a key role in human-computer interaction in the field of artificial intelligence(AI).In this work,we have designed and constructed a novel olfactory-visual bimodal neuromorphic car...Artificial multisensory devices play a key role in human-computer interaction in the field of artificial intelligence(AI).In this work,we have designed and constructed a novel olfactory-visual bimodal neuromorphic carbon nanotube thin film transistor(TFT)arrays for artificial olfactory-visual multisensory synergy recognition with a very low power consumption of 25 aJ for a single pulse,employing semiconducting single-walled carbon nanotubes(sc-SWCNTs)as channel materials and gas sensitive materials,and poly[[4,8-bis[5-(2-ethylhexyl)-2-thienyl]benzo[1,2-b:4,5-b0]dithiophene-2,6-diyl]-2,5-thiophenediyl-[5,7-bis(2-ethylhexyl)-4,8-dioxo-4H,8H-benzo[1,2-c:4,5-c0]dithio-phene-1,3-diyl]](PBDB-T)as the photosensitive material.It is noted that it is the first time to realize the simulation of olfactory and visual senses(from 280 nm to 650 nm)with the wide operating temperature range(0-150℃)in a single SWCNT TFT device and successfully simulate the recovery of olfactory senses after COVID-19 by olfactory-visual synergy.Furthermore,our SWCNT neuromorphic TFT devices with a high IOn/IOff ratio(up to 10^(6))at a low operating voltage(−2 to 0.5 V)can mimic not only the basic biological synaptic functions of olfaction and vision(such as paired-pulse facilitation,short-term plasticity,and long-term plasticity),but also optical wireless communication by Morse code.The proposed multisensory,broadband light-responsive,low-power synaptic devices provide great potential for developing AI robots to face complex external environments.展开更多
NiMn-MOF was prepared via one-step hydrothermal method,and then Ni/MnO/C composites were synthesized by high-temperature pyrolysis.The findings indicate that the sample acquired at the pyrolysis temperature of 700℃ d...NiMn-MOF was prepared via one-step hydrothermal method,and then Ni/MnO/C composites were synthesized by high-temperature pyrolysis.The findings indicate that the sample acquired at the pyrolysis temperature of 700℃ demonstrate superior microwave absorption capabilities.The minimum reflection value achieves-19.2 dB at a thickness of 1.4mm,and the effective absorption bandwidth extends to 5.04 GHz at a mere 1.6mm.The exceptional microwave absorption proficiency can be ascribed to the multiple reflections and scattering generated by the material’s unique porous spherical structure,optimized impedance matching,suitable conduction loss,rich interfacial and dipole polarization,and magnetic loss.This study presents a straightforward procedural technique for the fabrication of effective composite absorbers.展开更多
In situ growth of co-catalysts on BiVO_(4)(BVO)to enhance photoelectrochemical(PEC)water splitting performance has been extensively reported.However,the understanding of the synergistic effects among various elements,...In situ growth of co-catalysts on BiVO_(4)(BVO)to enhance photoelectrochemical(PEC)water splitting performance has been extensively reported.However,the understanding of the synergistic effects among various elements,especially at the interface between the semiconductor and cocatalyst,has received insufficient attention.In this study,we report a Co,Ni and Mn trimetallic fluoride-modified BVO photoanode featuring a unique interfacial chemical bond(V-F).Under AM 1.5 G illumination,an exciting photocurrent density of 6.05 mA cm^(-2)was achieved at 1.23 V vs.RHE by the integrated BVO/CoNi_(0.18)Mn_(0.12)(OH)_(x)F photoanode and over 98%of the initial photocurrent was maintained after 10 h of photoelectrolysis.Control experiments and theoretical calculations demonstrate that the V-F interfacial bond stabilizes the Co^(2+)active sites.It serves as a transmission gear,interlinking the migration of interfacial charge and the regeneration of cocatalyst,endowing the photoanode with significant activity and stability.Furthermore,we have systematically elucidated the role of the individual Co,Ni,and Mn components in the synergistic cocatalyst layer.The interfacial modification provides novel insights into developing advanced photoanodes towards PEC water splitting.展开更多
Expo promotes trade,investment,cooperation,innovation,and exchanges pertaining to the global supply chain system From 16 to 20 July,the China International Exhibition Centre in Shunyi,Beijing,was bustling with energy ...Expo promotes trade,investment,cooperation,innovation,and exchanges pertaining to the global supply chain system From 16 to 20 July,the China International Exhibition Centre in Shunyi,Beijing,was bustling with energy as it hosted the third edition of the China International Supply Chain Expo(CISCE).As the world’s first national-level expo focused on supply chains,the CISCE has quickly emerged as a signature platform for international industrial collaboration.展开更多
In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs.However,it is a challenge to achieve in-depth profile control.In this paper,two types of organic...In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs.However,it is a challenge to achieve in-depth profile control.In this paper,two types of organic gel systems,namely s-MPG and MSRG,tailored for fractured-vuggy reservoirs with 140℃ and 22×10^(4) mg/L have been developed.FTIR was used to analyze the functional groups of s-MPG and MSRG.Additionally,the quality retention rates of s-MPG and MSRG were assessed using TG-DSC,yielding results of 92.85%and 92.65%,respectively.The dilution rates of s-MPG and MSRG are found to be 18.69%and 26.69%,respectively,demonstrating excellent compatibility and adaptability.The enhancement performance depends on the synergistic effect that the anti-dilution s-MPG effectively separates bottom water,while high-strength MSRG separates the oil layer.Moreover,the EOR perfor-mances of s-MPG synergy with MSRG in various types of fractured-vuggy carbonate models were also evaluated.The highest oil recovery of 12%is achieved in fracture network model.Laboratory results indicate that the synergistic combination of s-MPG and MSRG for water plugging in fractured-vuggy carbonate reservoirs results in a more effective enhancement of oil recovery compared to using a sin-gle gel system for plugging.Finally,the s-MPG synergy with MSRG has been applied in actual fractured-vuggy carbonate reservoirs.As expected,the water cut of typical well is reduced from 100%to 30%and the increased oil production is 1142 t totally.Therefore,this study presents a novel approach to achieving in-depth profile control by leveraging the synergistic effect of s-MPG with MSRG in fractured-vuggy carbonate reservoirs.展开更多
Insufficient metallurgical compatibility between Zr and Ni can lead to the formation of brittle welds and introduce thermal stress-related challenges during the electron beam welding process.Through the implementation...Insufficient metallurgical compatibility between Zr and Ni can lead to the formation of brittle welds and introduce thermal stress-related challenges during the electron beam welding process.Through the implementation of beam deflection and vibration,a transformation was achieved in the primary Ni_(5)Zr dendrite structure,transitioning from a mass into a layered configuration,consequently resulting in the formation of an ultrafine-grained eutectic−dendrite complex structure.It is revealed that the enhanced strength−ductility synergy of this structure significantly contributes to the high tensile strength and improved plasticity observed in the welded joints.As a result,the welding cracks are effectively mitigated,and notable advancements are achieved in the mechanical properties of Zr/Ni joints,elevating the tensile strength of the joints from 36.4 to 189 MPa.This research not only highlights the potential of this technique in enhancing the strength and ductility of Zr/Ni welded joints but also serves as a valuable reference for future investigations involving welding applications of dissimilar metals.展开更多
The impregnation method for preparing catalysts often faces challenges such as prolonged preparation times and poor dispersion of active components due to the limited mobility of the impregnation liquid.The rotating p...The impregnation method for preparing catalysts often faces challenges such as prolonged preparation times and poor dispersion of active components due to the limited mobility of the impregnation liquid.The rotating packed bed(RPB)can break the precursor solution into fine droplets,enabling dynamic impregnation of active components onto the surface of activated carbon.This approach facilitates the uniform distribution of active components on the carrier and enhances the stability and performance of the catalyst.In this study,activated carbon catalysts were prepared using high-gravity technology.It was found that the preparation time for Co-MnO_(x)/GAC using the RPB method was reduced by 98%,the catalytic activity increased by 6.62%,and the loadings of active components increased by 13%and 17%,the catalytic activity remained stable after five cycles,with a significantly lower rate of metal dissolution.A suite of complementary analytical techniques demonstrates that Co-MnO_(x)/GAC(RPB)has higher homogeneity and dispersion.X-ray photoelectron spectroscopy(XPS)results indicate that Co(II)and Mn(IV)/Mn(III)are the primary active sites during the catalytic decomposition of ozone,elucidating the mechanism of synergistic catalytic ozonation by dual-active components.Finally,electron paramagnetic resonance(EPR)confirmed that hydroxyl radicals($OH)were the predominant reactive species in the reaction.展开更多
During cold rolling in magnesium(Mg)alloys,there will always be serious ductility deterioration,which greatly restricts the application of this processing method.In this work,ductility-strength synergy occurred after ...During cold rolling in magnesium(Mg)alloys,there will always be serious ductility deterioration,which greatly restricts the application of this processing method.In this work,ductility-strength synergy occurred after cold rolling was carried out on a<0001>fiber textured Mg-17.5Gd-Zr alloy(wt.%).The ductility-strength synergy can be mainly attributed to texture randomization,microstructure refinement,and easier basal slip transfer condition in the twinned grains.Firstly,the activation of multiple twinning behaviors,i.e.,{10-12},{10-11},and{11-21}twinning,and related twin-twin interaction restrict the formation of strong basal texture and facilitate the texture randomization.Secondly,profuse high-angle grain boundaries form through dislocation-twin interaction,twin-twin interaction,and dislocation interaction,which promote microstructure refinement.Thirdly,the basal slip transfer becomes easier in the twinned grains owing to the activation of multiple twinning behaviors and their impingements.Activation of{11-21}twinning and<c+a>dislocations and the<0001>fiber texture which is favorable for multiple twinning activating during cold rolling are considered to be the key roles for microstructure and texture optimization.展开更多
基金financial support from the National Nature Science Foundation of China(No.52273247)the National Science and Technology Major Project of China(J2019-VI-0017-0132).
文摘Developing advanced stealth devices to cope with radar-infrared(IR)fusion detection and diverse application scenarios is increasingly demanded,which faces significant challenges due to conflicting microwave and IR cloaking mechanisms and functional integration limitations.Here,we propose a multiscale hierarchical structure design,integrating wrinkled MXene IR shielding layer and flexible Fe_(3)O_(4)@C/PDMS microwave absorption layer.The top wrinkled MXene layer induces the intensive diffuse reflection effect,shielding IR radiation signals while allowing microwave to pass through.Meanwhile,the permeable microwaves are assimilated into the bottom Fe_(3)O_(4)@C/PDMS layer via strong magneto-electric synergy.Through theoretical and experimental optimization,the assembled stealth devices realize a near-perfect stealth capability in both X-band(8–12 GHz)and long-wave infrared(8–14μm)wavelength ranges.Specifically,it delivers a radar cross-section reduction of−20 dB m^(2),a large apparent temperature modulation range(ΔT=70℃),and a low average IR emissivity of 0.35.Additionally,the optimal device demonstrates exceptional curved surface conformability,self-cleaning capability(contact angle≈129°),and abrasion resistance(recovery time≈5 s).This design strategy promotes the development of multispectral stealth technology and reinforces its applicability and durability in complex and hostile environments.
基金support from the China Scholarship Council(No.202107000038)support from the National Natural Science Foundation of China(Nos.52004227,52061040,and 12222209)the China Postdoctoral Science Foundation(No:2021M692512).
文摘This study aims to achieve a synergy of strength and ductility in magnesium-based nanocomposite materials through the design of a dual-heterostructure. Utilizing ball milling and hot extrusion, a nano-TiC/AZ61 composite featuring particle-rare coarse grain (CG) and particle-rich fine grain (FG) zones was successfully fabricated. Experimental results demonstrated that compared with the homogeneous structure, the dual-heterostructure composite achieved a significant increase in elongation by 116 % and a remarkable 165 % improvement in the strength-ductility product (SDP), while maintaining a high ultimate tensile strength (UTS) of 417±4 MPa. This substantial performance enhancement is primarily attributed to the additional strain hardening induced by hetero-deformation-induced (HDI) strain hardening and crack-blunting capabilities, as elucidated by microstructural characterization and crystal plasticity finite element modeling (CPFEM). Notably, the strain hardening contribution from the CG zones at the early stage of deformation (≤ 45 % of total plastic deformation amount) is minimal but increases significantly during the subsequent deformation stages. The dislocation increment rate in CG zones (219 %) is observed to be more than double that in FG zones (95 %), attributed to the large grain size and low dislocation density in CG zones, which provide more space for dislocation storage. In addition, the aggravated deformation inhomogeneity as deformation progresses leads to an increase in geometrically necessary dislocations (GNDs) generation near the heterogeneous interface, thereby enhancing HDI hardening. Fracture mechanism analysis indicated that the cracks mainly initiate in the FG region and are effectively blunted upon their propagation to the CG region, necessitating increased energy consumption and indicating higher fracture toughness for the dual-heterostructure composites. This study validates the effectiveness of the dual-heterostructure design in magnesium-based composites, providing a novel understanding of the deformation mechanism through both experimental analysis and CPFEM, paving the way for the development of high-performance, lightweight structural materials.
基金supported by the National Natural Science Foundation of China(Grant Nos.92263201,51927801,and 52001160)the National Key Research and Development Program of China(Grant No.2020YFA0405900).
文摘A solid solution 6063 aluminium alloy features an exceptional combination of strength and ductility at 77 K.Here,the deformation mechanisms responsible for superior strength-ductility synergy and excellent strain hardening capacity at a cryogenic temperature of the alloy were comparatively investigated by insitu electron backscatter diffraction(EBSD)observations coupled with transmission electron microscopy(TEM)characterization and fracture morphologies at both 298 and 77 K.It is found that kernel average misorientation(KAM)mappings and quantified KAM in degree suggest a higher proportion of geometrically necessary dislocations(GNDs)at 77 K.The existence of orientation scatter partitions at 77 K implies the activation of multiple slip systems,which is consistent with the results of potential slip systems calculated by Taylor axes.Furthermore,dislocation tangles characterized by brief and curved dislocation cells and abundant small dimples have been observed at 77 K.This temperature-mediated activation of dislocations facilitates the increased dislocations,thus enhancing the strain hardening capacity and ductility of the alloy.This research enriches cryogenic deformation theory and provides valuable insights into the design of high-performance aluminium alloys that are suitable for cryogenic applications.
基金funded by the National Natural Science Foundation of China(No.52204407)the Natural Science Foundation of Jiangsu Province(No.BK20220595)+1 种基金the China Postdoctoral Science Foundation(No.2022M723689)the Industrial Collaborative Innovation Project of Shanghai(No.XTCX-KJ-2022-2-11)。
文摘The application of machine learning in alloy design is increasingly widespread,yet traditional models still face challenges when dealing with limited datasets and complex nonlinear relationships.This work proposes an interpretable machine learning method based on data augmentation and reconstruction,excavating high-performance low-alloyed magnesium(Mg)alloys.The data augmentation technique expands the original dataset through Gaussian noise.The data reconstruction method reorganizes and transforms the original data to extract more representative features,significantly improving the model's generalization ability and prediction accuracy,with a coefficient of determination(R^(2))of 95.9%for the ultimate tensile strength(UTS)model and a R^(2)of 95.3%for the elongation-to-failure(EL)model.The correlation coefficient assisted screening(CCAS)method is proposed to filter low-alloyed target alloys.A new Mg-2.2Mn-0.4Zn-0.2Al-0.2Ca(MZAX2000,wt%)alloy is designed and extruded into bar at given processing parameters,achieving room-temperature strength-ductility synergy showing an excellent UTS of 395 MPa and a high EL of 17.9%.This is closely related to its hetero-structured characteristic in the as-extruded MZAX2000 alloy consisting of coarse grains(16%),fine grains(75%),and fiber regions(9%).Therefore,this work offers new insights into optimizing alloy compositions and processing parameters for attaining new high strong and ductile low-alloyed Mg alloys.
文摘With the continuous advancement of cancer treatment methods, plasma combined with drug therapy has garnered widespread attention as an emerging therapeutic strategy. This paper elaborates on the generation and characteristics of plasma, as well as its mechanisms of action on cancer cells when used alone, including the production of reactive oxygen and nitrogen species, and damage to cancer cell membranes, and organelles. It emphasizes the synergistic mechanisms observed when plasma is combined with various anticancer drugs (e.g., chemotherapeutic agents, targeted drugs, and immunotherapies). The analysis focuses on enhancing drug uptake, promoting the activation of drug action targets, and improving the tumor microenvironment. These insights provide a theoretical basis for optimizing plasma-drug combination therapy for cancer.
基金Project supported by the National Natural Science Foundation of China(52301041)Guizhou Provincial Science and Technology Projects(Qingnian No.2024-123)the Special Fund for Special Posts of Guizhou University(2023-26,2023-53)。
文摘In this study,a novel strategy for breaking the strength-ductility dilemma of Mg-1.5Zn-0.6Gd(wt%)alloy via solute segregation was reported.The hot extruded alloy sheet was subjected to rolling deformation,and then heat-treated at 200℃.The high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)reveals a remarkable segregation of solute Zn atoms along both high and lowangle grain boundaries(GBs).As compared with as-rolled plate,the yield strength,ultimate tensile strength,and the elongation of annealed sample is increased by 15.6%,14%,and 8.4%,respectively,acquiring an obvious strength-ductility synergy effect.The solute segregation endows the rolled plate with excellent grain size stability and provides a prominent extra solute cluster strengthening,which completely resists the other softening effects including dislocation annihilation and grain coarsening.Meanwhile,the directional migration of Zn atoms and the annihilation of dislocations provide a"clear"space within the grain,which is beneficial for the moving and accumulating of subsequent dislocations.This work sheds light on the solute partitioning behavior and realizes a good application of GB segregation in improving the comprehensive mechanical properties of Mg alloys.
基金supported by the National Natural Science Foundation of China(Nos.52271113,92163201)Jinyu Zhang is grateful for the Shaanxi Province Youth Innovation Team(No.22JP042)Shaanxi Province Innovation Team Project(2024RS-CXTD-58).
文摘Titanium alloys engineered in structural applications achieve ultrahigh strength primarily through precipitation strengthening of secondary α-phase(αs)during aging,while they often experience compromised ductility and toughness due to traditional strength-toughness tradeoff.In this study,we propose a novel strategy to address this conflict by introducing deformation kinks prior to conventional cold rolling(CR)and aging processes.These kinks are produced by cold forging(CF)to create macroscopic lamellar structures in β-grains,which alter strain partitioning during subsequent CR and ultimately tailor α_(s)-precipitation upon aging.As a result,an ultrafine duplex(αe+β)-structure is formed within kink interi-ors,while hierarchicalαs-precipitates are generated in the external β-matrix.This unique microstructure effectively enhances dislocation activity,promotes uniform plastic strain distribution and impedes crack propagation.Consequently,a simple Ti-V binary titanium alloy exhibits exceptional properties with ultra-high strength∼1636 MPa,decent ductility∼5.4% and appreciable fracture toughness∼36.1 MPa m^(1/2).The synergetic properties surpass those obtained through traditional CR and aging processes for the alloy and even outperform numerous multielement engineering titanium alloys reported in literature.Our findings open up a new avenue for overcoming the strength-toughness tradeoffof ultrahigh-strength titanium alloys,and also offer a facile production route towards structural materials for advanced performance.
文摘BACKGROUND The upsurge of antibiotic resistance is a significant challenge to public health,and the dry pipeline of new antibiotics has prompted the discovery of alternative treatment approaches.Enterococcus faecalis(E.faecalis)isolates are often multidrugresistant,posing challenges to antibiotic therapy.Bacteriophage therapy is being explored as an alternative method to treat the growing population of antibioticresistant infections.Nevertheless,many inherent limitations of phages diminish their therapeutic utility,notably the restricted host range and quick development of mutants.The specific types and quantities of bacteriophages and antibiotics may be crucial in generating the optimal phage-antibiotic synergy.AIM To optimize the doses,order,and timing to optimize the synergy of phages and vancomycin on different bacteria states.METHODS A volume of 180μL of E.faecalis bacteria in the logarithmic growth phase,with a concentration of approximately 1×10^(8)colony forming units(CFUs)/mL,was introduced onto a microtitre plate.Subsequently,20μL of phage suspension(1×10^(6)PFUs/mL),vancomycin(16μg/mL),or a combination of both was introduced into the designated wells in the specified sequence and incubated at 37°C for 48 hours.The number of live bacteria was counted at different time points using standardized CFU counting protocols.RESULTS The biofilm model demonstrated that combining phages with vancomycin can eradicate the biofilm.Sequential therapy,involving phage application 8 hours before the antibiotic at a concentration of 108 PFUs/mL,proved the most efficient in eliminating the biofilms and killing the planktonic form of E.faecalis.CONCLUSION The combination of phageɸEFP01 at a higher concentration with a subinhibitory concentration of vancomycin yields a synergistic antibacterial outcome on E.faecalis strain resistant to vancomycin.
基金Supported by the Industrial Collaborative Innovation Project of Shanghai(Grant No XTCX-KJ-2022-2-11)the National Natural Science Foundation of China(Grant No52073176)。
文摘In this work,the GW63K(Mg-6.54Gd-3.93Y-0.41Zr,wt.%)alloy wire was utilized as the feedstock material and the thin-walled component was fabricated using wire-arc additive manufacturing technology(WAAM).The microstructural evolution during deposition and subsequent heat treatment was explained through multi-scale microstructural characterization techniques,and the impact of heat treatment on the strengthductility synergy of the deposited alloy was systematically compared.The results showed that the microstructure of the deposited sample was mainly composed of fine equiaxedα-Mg grains and Mg_(24)(Gd,Y)_(5) phase.The optimized solution heat treatment(450℃×2 h)had little effect on the grain size,but can effectively reduce the Mg_(24)(Gd,Y)_(5) eutectic phase on the grain boundary,resulting in a significant increase in elongation from 13.7% to 26.6%.After peak-aging treatment,the strength of the GW63K alloy increased to 370 MPa,which was significantly higher than the as-built state(267 MPa).The superior strength in this study is attributed to the refinement strengthening imparted by the fine microstructure inherited in the as-built GW63K alloy,as well as the precipitation strengthening due to the formation of dense β’precipitates with a pronounced plate-like aspect ratio.
基金National Natural Science Foundation of China(grants 22072065,22178162,and 22222806)Distinguished Youth Foundation of Jiangsu Province(grant BK20220053)Six talent peaks project in Jiangsu Province(grant JNHB-035)。
文摘The synergy of single atoms(SAs)and nanoparticles(NPs)has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction(CO_(2)RR);however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst design.Herein,a Ni2+-loaded porous poly(ionic liquids)(PIL)precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing temperature.The catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO_(2)into CO.Operando Ni K-edge X-ray absorption near-edge structure(XANES)spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and NPs.The charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active sites.In the electroreduction of CO_(2),the coexistence of Ni SAs and NPs strengthened the CO_(2)activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO_(2)→*COOH step,and therefore promoted the catalysis efficiency.
基金supported by the National Key R&D Program of China(No.2023YFE0105200)the National Natural Science Foundation of China(Nos.21905072,22077025,22207029,U20A20260)+3 种基金the Natural Science Foundation of Hebei Province(Nos.B2020202086,B2023202024,B2021202041,B2020202062)the Financial Support Project of Central Government for Promoting Development of Science and Technology of Hebei Province(No.236Z2705G)the Excellent Young Scientist Fund of the Natural Science Foundation of Hebei Province(No.B2022202027)the Science Research Project of Hebei Education Department(No.ZD2021032).
文摘With prolonged exposure in the human body,titanium alloy implants face challenges associated with bacterial attachment and proliferation,leading to implant failure and severe complications.Photothermal therapy(PTT)emerges as an efficient strategy for biofilm elimination.However,the local high temperature of PTT and incomplete bacteria ablation in low-temperature PTT pose risks of damage to normal tissues and biofilm recalcitrance,respectively.In this study,we synergistically combined photothermal therapy and chemotherapy to mildly disrupt biofilms of Staphylococcus aureus(S.aureus)to enhance the efficiency of biofilm ablation.The synergistic nanoplatform comprises near-infrared-light responsive con-jugated polymers,heat-sensitive liposomes,and the antibiotic daptomycin for biofilm elimination.The heat generated by conjugated polymers,stimulated with 808 nm light,alters biofilm permeability and releases antibiotics locally to eradicate biofilm.The nanoparticles exhibit biofilm dispersion activity and can effectively inhibit biofilm growth for up to 5 days.Consequently,this nanoplatform based on conjugated polymers offers a reliable method for ablating biofilms on titanium alloy implant and exhibits potential in drug-resistant clinical applications.
文摘Objective:To explore the experiences of palliative care multidisciplinary teams from the perspective of pluralistic synergy theory,aiming to enhance team collaboration.Method:Utilizing a qualitative research methodology,we conducted in-depth interviews with 15 palliative care team members to collect data.Results:The operational framework of palliative care multidisciplinary teams under pluralistic synergy theory involves:enhancing collaboration among team members;developing a comprehensive management model for the team;rationalizing the allocation of work tasks and durations;improving team communication and interaction through effective communication mechanisms and platforms;cultivating skilled professionals;and establishing a robust health record management system.Conclusion:The operational mechanism,informed by pluralistic synergy theory,advances the development of palliative care.
基金supported by the National Key Research and Development Program of China(2020YFA0714700)Natural Science Foundation of China(62274174)+3 种基金Key Research and Development Program of Jiangsu Province(BK20232009)a fellowship from the China Postdoctoral Science Foundation(NO:2023M742559)the Cooperation Project of Vacuum Interconnect Research Facility(NANO-X)of Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences(F2208)the technical support for Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences(SINANO)。
文摘Artificial multisensory devices play a key role in human-computer interaction in the field of artificial intelligence(AI).In this work,we have designed and constructed a novel olfactory-visual bimodal neuromorphic carbon nanotube thin film transistor(TFT)arrays for artificial olfactory-visual multisensory synergy recognition with a very low power consumption of 25 aJ for a single pulse,employing semiconducting single-walled carbon nanotubes(sc-SWCNTs)as channel materials and gas sensitive materials,and poly[[4,8-bis[5-(2-ethylhexyl)-2-thienyl]benzo[1,2-b:4,5-b0]dithiophene-2,6-diyl]-2,5-thiophenediyl-[5,7-bis(2-ethylhexyl)-4,8-dioxo-4H,8H-benzo[1,2-c:4,5-c0]dithio-phene-1,3-diyl]](PBDB-T)as the photosensitive material.It is noted that it is the first time to realize the simulation of olfactory and visual senses(from 280 nm to 650 nm)with the wide operating temperature range(0-150℃)in a single SWCNT TFT device and successfully simulate the recovery of olfactory senses after COVID-19 by olfactory-visual synergy.Furthermore,our SWCNT neuromorphic TFT devices with a high IOn/IOff ratio(up to 10^(6))at a low operating voltage(−2 to 0.5 V)can mimic not only the basic biological synaptic functions of olfaction and vision(such as paired-pulse facilitation,short-term plasticity,and long-term plasticity),but also optical wireless communication by Morse code.The proposed multisensory,broadband light-responsive,low-power synaptic devices provide great potential for developing AI robots to face complex external environments.
基金financially supported by the National Natural Science Foundation of China(Nos.20904019,51273089,52173267)the Aviation Science Foundation of China(No.2017ZF56020)the First Training-class High-end Talents Projects of Science and Technology Innovation in Jiangxi Province(No.CK202002473).
文摘NiMn-MOF was prepared via one-step hydrothermal method,and then Ni/MnO/C composites were synthesized by high-temperature pyrolysis.The findings indicate that the sample acquired at the pyrolysis temperature of 700℃ demonstrate superior microwave absorption capabilities.The minimum reflection value achieves-19.2 dB at a thickness of 1.4mm,and the effective absorption bandwidth extends to 5.04 GHz at a mere 1.6mm.The exceptional microwave absorption proficiency can be ascribed to the multiple reflections and scattering generated by the material’s unique porous spherical structure,optimized impedance matching,suitable conduction loss,rich interfacial and dipole polarization,and magnetic loss.This study presents a straightforward procedural technique for the fabrication of effective composite absorbers.
文摘In situ growth of co-catalysts on BiVO_(4)(BVO)to enhance photoelectrochemical(PEC)water splitting performance has been extensively reported.However,the understanding of the synergistic effects among various elements,especially at the interface between the semiconductor and cocatalyst,has received insufficient attention.In this study,we report a Co,Ni and Mn trimetallic fluoride-modified BVO photoanode featuring a unique interfacial chemical bond(V-F).Under AM 1.5 G illumination,an exciting photocurrent density of 6.05 mA cm^(-2)was achieved at 1.23 V vs.RHE by the integrated BVO/CoNi_(0.18)Mn_(0.12)(OH)_(x)F photoanode and over 98%of the initial photocurrent was maintained after 10 h of photoelectrolysis.Control experiments and theoretical calculations demonstrate that the V-F interfacial bond stabilizes the Co^(2+)active sites.It serves as a transmission gear,interlinking the migration of interfacial charge and the regeneration of cocatalyst,endowing the photoanode with significant activity and stability.Furthermore,we have systematically elucidated the role of the individual Co,Ni,and Mn components in the synergistic cocatalyst layer.The interfacial modification provides novel insights into developing advanced photoanodes towards PEC water splitting.
文摘Expo promotes trade,investment,cooperation,innovation,and exchanges pertaining to the global supply chain system From 16 to 20 July,the China International Exhibition Centre in Shunyi,Beijing,was bustling with energy as it hosted the third edition of the China International Supply Chain Expo(CISCE).As the world’s first national-level expo focused on supply chains,the CISCE has quickly emerged as a signature platform for international industrial collaboration.
基金support of Sinopec Northwest Oilfield Company,Xinjiang Urumqi(Grant No.KJ202336).
文摘In-depth profile control is a crucial technique employed to enhance oil recovery in fractured-vuggy carbonate reservoirs.However,it is a challenge to achieve in-depth profile control.In this paper,two types of organic gel systems,namely s-MPG and MSRG,tailored for fractured-vuggy reservoirs with 140℃ and 22×10^(4) mg/L have been developed.FTIR was used to analyze the functional groups of s-MPG and MSRG.Additionally,the quality retention rates of s-MPG and MSRG were assessed using TG-DSC,yielding results of 92.85%and 92.65%,respectively.The dilution rates of s-MPG and MSRG are found to be 18.69%and 26.69%,respectively,demonstrating excellent compatibility and adaptability.The enhancement performance depends on the synergistic effect that the anti-dilution s-MPG effectively separates bottom water,while high-strength MSRG separates the oil layer.Moreover,the EOR perfor-mances of s-MPG synergy with MSRG in various types of fractured-vuggy carbonate models were also evaluated.The highest oil recovery of 12%is achieved in fracture network model.Laboratory results indicate that the synergistic combination of s-MPG and MSRG for water plugging in fractured-vuggy carbonate reservoirs results in a more effective enhancement of oil recovery compared to using a sin-gle gel system for plugging.Finally,the s-MPG synergy with MSRG has been applied in actual fractured-vuggy carbonate reservoirs.As expected,the water cut of typical well is reduced from 100%to 30%and the increased oil production is 1142 t totally.Therefore,this study presents a novel approach to achieving in-depth profile control by leveraging the synergistic effect of s-MPG with MSRG in fractured-vuggy carbonate reservoirs.
基金supported by the National Natural Science Foundation of China(No.52375322).
文摘Insufficient metallurgical compatibility between Zr and Ni can lead to the formation of brittle welds and introduce thermal stress-related challenges during the electron beam welding process.Through the implementation of beam deflection and vibration,a transformation was achieved in the primary Ni_(5)Zr dendrite structure,transitioning from a mass into a layered configuration,consequently resulting in the formation of an ultrafine-grained eutectic−dendrite complex structure.It is revealed that the enhanced strength−ductility synergy of this structure significantly contributes to the high tensile strength and improved plasticity observed in the welded joints.As a result,the welding cracks are effectively mitigated,and notable advancements are achieved in the mechanical properties of Zr/Ni joints,elevating the tensile strength of the joints from 36.4 to 189 MPa.This research not only highlights the potential of this technique in enhancing the strength and ductility of Zr/Ni welded joints but also serves as a valuable reference for future investigations involving welding applications of dissimilar metals.
基金supported by the National Natural Science Foundation of China(U23A20676)Key Research&Development Plan of Shanxi Province(202202040201011)+3 种基金Shanxi Scholarship Council of China(2023-128)Small and medium-sized oriented scientific and technological enterprises innovation ability improvement project of Shandong Province(2023TSGC0004)the Graduate Student Innovation Project of Shanxi Province(2023SJ205)Local Funds for Science and Technology Development Guided by the Central Finance(YDZJSX20231A030).
文摘The impregnation method for preparing catalysts often faces challenges such as prolonged preparation times and poor dispersion of active components due to the limited mobility of the impregnation liquid.The rotating packed bed(RPB)can break the precursor solution into fine droplets,enabling dynamic impregnation of active components onto the surface of activated carbon.This approach facilitates the uniform distribution of active components on the carrier and enhances the stability and performance of the catalyst.In this study,activated carbon catalysts were prepared using high-gravity technology.It was found that the preparation time for Co-MnO_(x)/GAC using the RPB method was reduced by 98%,the catalytic activity increased by 6.62%,and the loadings of active components increased by 13%and 17%,the catalytic activity remained stable after five cycles,with a significantly lower rate of metal dissolution.A suite of complementary analytical techniques demonstrates that Co-MnO_(x)/GAC(RPB)has higher homogeneity and dispersion.X-ray photoelectron spectroscopy(XPS)results indicate that Co(II)and Mn(IV)/Mn(III)are the primary active sites during the catalytic decomposition of ozone,elucidating the mechanism of synergistic catalytic ozonation by dual-active components.Finally,electron paramagnetic resonance(EPR)confirmed that hydroxyl radicals($OH)were the predominant reactive species in the reaction.
基金supported by the National Natural Science Foundation of China(Nos.52301164,52371121 and 52271107)the Natural Science Foundation of Shandong Province(No.ZR2021ME241)the Basic Research Project of Education Department of Liaoning Province(No.JYTQN2023066).
文摘During cold rolling in magnesium(Mg)alloys,there will always be serious ductility deterioration,which greatly restricts the application of this processing method.In this work,ductility-strength synergy occurred after cold rolling was carried out on a<0001>fiber textured Mg-17.5Gd-Zr alloy(wt.%).The ductility-strength synergy can be mainly attributed to texture randomization,microstructure refinement,and easier basal slip transfer condition in the twinned grains.Firstly,the activation of multiple twinning behaviors,i.e.,{10-12},{10-11},and{11-21}twinning,and related twin-twin interaction restrict the formation of strong basal texture and facilitate the texture randomization.Secondly,profuse high-angle grain boundaries form through dislocation-twin interaction,twin-twin interaction,and dislocation interaction,which promote microstructure refinement.Thirdly,the basal slip transfer becomes easier in the twinned grains owing to the activation of multiple twinning behaviors and their impingements.Activation of{11-21}twinning and<c+a>dislocations and the<0001>fiber texture which is favorable for multiple twinning activating during cold rolling are considered to be the key roles for microstructure and texture optimization.
