1.Introduction.The Ti6Al4V alloy is extensively utilized across various indus-trial sectors due to its favorable characteristics,such as lightweight design,high strength,and resistance to corrosion[1].In effort s to f...1.Introduction.The Ti6Al4V alloy is extensively utilized across various indus-trial sectors due to its favorable characteristics,such as lightweight design,high strength,and resistance to corrosion[1].In effort s to further reduce weight,functional elements like electric actuators can be substituted with intelligent materials like shape memory alloys(SMAs)[2,3].Among SMAs,NiTi alloy stands out for its sens-ing and actuation capabilities,significantly enhancing the safety and reliability of engineering structures[4,5].Integrating Ti6Al4V and NiTi alloys within a single component holds the potential to provide precise feedback on mechanical,thermal,or environmen-tal conditions[6,7].展开更多
Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the joints.Results show that under different welding parameters,with ...Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the joints.Results show that under different welding parameters,with the decrease in welding heat input,the weld surface is smoother.The Ti/Al joint interface is flat without obvious Ti and Al mixed structure,and the hook structure is not formed under optimal parameters.Due to the enhanced breaking effect of the stirring head,the hook structural defects and intermetallic compounds are more likely to form at the Ti/Al interface at high rotational speed of 1000 r/min,thereby deteriorating the mechanical properties of joints.Decreasing the heat input is beneficial to hardness enhancement of the aluminum alloy in the weld nugget zone.Under the optimal parameters of rotation speed of 800 r/min and welding speed of 120 mm/min,the maximum tensile shear strength of joint is 289 N/mm.展开更多
7039 Al alloys are widely used in armor vehicles,given the material’s high specific strength and fracture toughness.However,laminar tearing in the thickness plane of the base metal(BM),specifically in the normal dire...7039 Al alloys are widely used in armor vehicles,given the material’s high specific strength and fracture toughness.However,laminar tearing in the thickness plane of the base metal(BM),specifically in the normal direction(ND)and rolling direction(RD)plane,was occasionally observed after the welding of thick plates,resulting in premature material failure.A vertically metal-inert gas(MIG)-welded laminar tearing component of a 30 mm thick plate was analyzed to determine the factors associated with this phenomenon.The texture,residual stress,microhardness,and tensile properties were also investigated.The results indicated that the crack extended along the RD as a transcrystalline fracture and terminated at the BM.The grains near the crack grew preferentially in the(001)crystal direction.Furthermore,the tensile strength(83 MPa)and elongation(6.8%)in the RD were relatively higher than those in the ND.In particular,the primary factors for crack initiation include stronger texture,higher dislocation density,increased Al_(7)Cu_(2)Fe phases,lower proportion of small-angle grain boundaries,and varying grain sizes in different regions,leading to the fragile microstructure.The higher residual stress of the BM promotes the formation and extension of cracks.The restraining force due to fixation and welding shrinkage force transformed the crack into laminar tearing.Preventive measures of laminar tearing were also proposed.展开更多
Developing effective and long-term treatment strategies for rare and complex neurodegenerative diseases is challenging. One of the major roadblocks is the extensive heterogeneity among patients. This hinders understan...Developing effective and long-term treatment strategies for rare and complex neurodegenerative diseases is challenging. One of the major roadblocks is the extensive heterogeneity among patients. This hinders understanding the underlying disease-causing mechanisms and building solutions that have implications for a broad spectrum of patients. One potential solution is to develop personalized medicine approaches based on strategies that target the most prevalent cellular events that are perturbed in patients. Especially in patients with a known genetic mutation, it may be possible to understand how these mutations contribute to problems that lead to neurodegeneration. Protein–protein interaction analyses offer great advantages for revealing how proteins interact, which cellular events are primarily involved in these interactions, and how they become affected when key genes are mutated in patients. This line of investigation also suggests novel druggable targets for patients with different mutations. Here, we focus on alsin and spastin, two proteins that are identified as “causative” for amyotrophic lateral sclerosis and hereditary spastic paraplegia, respectively, when mutated. Our review analyzes the protein interactome for alsin and spastin, the canonical pathways that are primarily important for each protein domain, as well as compounds that are either Food and Drug Administration–approved or are in active clinical trials concerning the affected cellular pathways. This line of research begins to pave the way for personalized medicine approaches that are desperately needed for rare neurodegenerative diseases that are complex and heterogeneous.展开更多
Self-designed Al8Si0.4Mg0.4Fe aluminium alloy was modified with Sr,followed by solid solution and aging treatments to regulate its microstructure and mechanical/electrical properties.The results show that after the mo...Self-designed Al8Si0.4Mg0.4Fe aluminium alloy was modified with Sr,followed by solid solution and aging treatments to regulate its microstructure and mechanical/electrical properties.The results show that after the modification treatment,the room-temperature tensile strength of the alloy remains nearly unchanged,the elongation at break slightly increases from 1.82%to 3.34%,and the electrical conductivity significantly increases from 40.1%international annealed copper standard(IACS)to 42.0%IACS.After the modification,the alloy was subjected to solid solution treatment at 515℃for 8 h,followed by aging treatment at 180,200,220 and 240℃for 6 h.With increasing aging temperature,the electrical conductivity increases monotonously from 41.4%IACS to 45.5%IACS,while the room-temperature tensile strength initially increases and then decreases.At 200℃,the alloy achieves an optimal balance between electrical conductivity and room-temperature tensile strength:the electrical conductivity is 42.5%IACS,and the room-temperature tensile strength is 282.9 MPa.When the aging temperature continues to rise,the alloy undergoes overaging.Although the conductivity continues to increase,the room-temperature tensile strength drops sharply,and it is only 177.1 MPa at 240℃.展开更多
The growth of single-crystalα-Al_(2)O_(3) is crucial for a variety of applications in electronics and other fields,while the synthesis of its two-dimensional(2D)form is not easy due to the high activation energy.Here...The growth of single-crystalα-Al_(2)O_(3) is crucial for a variety of applications in electronics and other fields,while the synthesis of its two-dimensional(2D)form is not easy due to the high activation energy.Here,we demonstrate the growth of single-crystal 2Dα-Al_(2)O_(3) by high temperature(high-T)annealing of Ni foils.Tens of micrometers of 2Dα-Al_(2)O_(3) flakes grow on the surface of Ni foils,which is attributed to the precipitation of Al atoms from the Ni foil bulk to its surface,followed by the oxidation of Al atoms on the surface.In principle,the Ni foil acts as a solvent,where diluted metal atoms precipitate onto the surface and react with oxygen from the atmosphere to grow single-crystal 2D metal oxides.Our findings may also provide a promising method for synthesizing other single-crystal 2D metal oxides.展开更多
Laser specific energy significantly impacts the quality of composite coatings.Ti−Al/WC coatings were prepared on the TC21 alloy through laser cladding with specific energy ranging from 66.7 to 133.3 J/mm^(2).The resul...Laser specific energy significantly impacts the quality of composite coatings.Ti−Al/WC coatings were prepared on the TC21 alloy through laser cladding with specific energy ranging from 66.7 to 133.3 J/mm^(2).The results indicate that the composite coatings primarily comprised Ti_(2)AlC,α_(2)-Ti_(3)Al,γ-TiAl,TiC,and W phases.A gradual increase in the relative intensity of the diffraction peaks of Ti_(2)AlC,α_(2)-Ti_(3)Al,and TiC appeared with the increase of specific energy.When the specific energy was 116.7 J/mm^(2),the Ti−Al/WC coated alloy achieved a maximum micro-hardness of HV0.2766.3,which represented an increase of 1.96 times compared with TC21 alloy,and the minimum wear rate decreased dramatically.Much improvement in tribological properties was attained through the fine-grained strengthening of the(α_(2)+γ)matrix and the dispersion strengthening of self-lubricating Ti_(2)AlC and intertwining TiC.This study provides valuable insights for the development of high-performance Ti−Al composite coatings.展开更多
1.Introduction The strength-ductility trade-offdilemma has long been a per-sistent challenge in Al matrix composites(AMCs)[1,2].This is-sue primarily arises from the agglomeration of reinforcements at the grain bounda...1.Introduction The strength-ductility trade-offdilemma has long been a per-sistent challenge in Al matrix composites(AMCs)[1,2].This is-sue primarily arises from the agglomeration of reinforcements at the grain boundaries(GBs),which restricts local plastic flow dur-ing the plastic deformation and leads to stress concentration[3,4].Recently,the development of concepts aimed at achieving hetero-geneous grain has emerged as a promising approach for enhanc-ing comprehensive mechanical properties[5,6].展开更多
Microstructure uniformity of the Al-Nd target materials with Al11 Nd_(3) significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor li...Microstructure uniformity of the Al-Nd target materials with Al11 Nd_(3) significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor liquid crystal display(TFT-LCD)panels.Understanding the inherent mechanical properties and chemical bonds of Al11 Nd_(3) is crucial for homogenizing the Al-Nd target.Here,by a combined experimental and ab-initio theoretical study,the microstructure and deformability of the Al-3wt%Nd alloy and the inherent mechanical properties and chemical bonds of Al11 Nd_(3) were investigated comprehensively.The Al-3wt%Nd alloy is composed of the pre-eutecticα-Al matrix and the eutecticα-Al and a high stableα-Al11 Nd_(3) phase.During the plastic deformation,the eutectic microstructure transforms from a cellular to a lamel-lar shape,while the morphology and dimension ofα-Al11 Nd_(3) are not changed significantly.By examin-ing ideal tensile strength,elastic moduli,hardness and brittleness-ductility,the hardness-brittleness ofα-Al11 Nd_(3) is quantitatively evaluated,accounting for its difficulties of plastic deformation and fragmen-tation.Combining band structure,population analysis,topological analysis and crystal orbital Hamilton population,we found thatα-Al11 Nd_(3) possesses two types of chemical bonds:the Nd-Al and Al-Al bonds.The former is a typical ionic bond with electron transfer from Nd to Al,while the latter,dominated by both 3 s-3 p and 3 p-3 p interactions,is a weak covalent bond.The mixed chemical bond is responsible for the high hardness-brittleness ofα-Al11 Nd_(3).This work is expected to lay a foundation for Al-Nd alloy and catalyze the fabrication of high-quality Al-Nd target materials.展开更多
BACKGROUND Hip dysplasia is a widespread and debilitating musculoskeletal disorder that affects children.Its prevalence varies across different nations.AIM To evaluate the prevalence of developmental hip dysplasia(DDH...BACKGROUND Hip dysplasia is a widespread and debilitating musculoskeletal disorder that affects children.Its prevalence varies across different nations.AIM To evaluate the prevalence of developmental hip dysplasia(DDH)within the pediatric population of Al Jouf province.METHODS From January 2018 to December 2023,children with DDH from all cities of Al Jouf were included in this retrospective cross-sectional study.The disease prevalence was calculated for the entire province as well as for individual cities within the territory.RESULTS The study included 427 patients with DDH with an overall prevalence of 0.50%,or 5.0 per 1000 live births.At the city level,Sakaka had the highest prevalence at 14.2 per 1000 Live births followed by Qurayyat at 2.2 per 1000 live births.In contrast,cities like Suwayr,Abu Ajram,and Meegowa did not show any incidence of DDH.Significant differences were observed in the sociodemographic characteristics,such as age,sex,and nationality,across the different cities(P<0.05).CONCLUSION The prevalence of DDH in the Al Jouf province is high.The data delivers invaluable insights into the epidemiology of DDH in the Al Jouf locality.The findings highlight the need for targeted screening of DDH across the province.展开更多
As the fundamental unit of soil,aggregates exhibit significant variations in their abilities to adsorb and desorb trace elements,depending on their size.Batch experiments were conducted to investigate the characterist...As the fundamental unit of soil,aggregates exhibit significant variations in their abilities to adsorb and desorb trace elements,depending on their size.Batch experiments were conducted to investigate the characteristics of adsorption and desorption of cadmium(Cd),copper(Cu),and lead(Pb)on and from soil aggregate fractions from three layers of a calcareous soil profile in Changxing County,Zhejiang Prvince,China.The results showed that both Langmuir and Freundlich models successfully described the isothermal adsorption processes of single Cd,Cu,and Pb on different soil aggregates.Additionally,aggregates from the bottom soil layer showed the highest maximum adsorption capacity and required the lowest energy for Cd,Cu,and Pb adsorption compared to aggregates from upper soil layers.The physicochemical properties of soil aggregates were found to govern the adsorption and desorption processes of heavy metals rather than the aggregate size,wherein the contents of iron/aluminum oxides and organic matter were the most crucial influencing factors.Cadmium displayed higher mobility than Cu and Pb in different soil aggregates,and the maximum adsorption capacities of the metal ions followed the order of Pb>Cu>Cd,while their desorption rates followed the order of Cd>Cu>Pb.Additionally,the<0.053 mm microaggregates presented the lowest desorption rates for Cd,Cu,and Pb compared to other soil aggregate fractions in each soil layer.Furthermore,the orthogonal experiment results demonstrated that the competitive adsorption between metals occurred on soil aggregates in the ternary heavy metal system,but only the desorption of Pb was significantly affected by the coexistence of Cd and Cu.展开更多
Non-isothermal aging(NIA)treatments have presented significant advantages in improving the comprehensive performance and aging hardening efficiency of the 7000 series aluminum alloys,but there is no attention paid to ...Non-isothermal aging(NIA)treatments have presented significant advantages in improving the comprehensive performance and aging hardening efficiency of the 7000 series aluminum alloys,but there is no attention paid to their composites.This study takes a linear heating aging process as an example to reveal the precipitation behaviors of a 15 vol.%SiC/7085Al composite as well as its impact on mechanical properties using differential scanning calorimetry,transmission electron microscopy,small-angle neutron scattering,hardness measurements,and tensile testing.The results indicated the formation of GP(Ⅰ,Ⅱ)zones,η’andηprecipitates in sequence,leading to the hardness and strength initially increasing and then decreasing with rising NIA temperatures.The maximums were reached at 183℃,corresponding to the appearance ofη’precipitates in large quantities.Owing to the rapid temperature rise during the NIA process,the precipitates entered the coarsening and redissolution stage before they were entirely formed,resulting in reduced peak strength compared to the T6 treatment.The composite exhibited a more significant reduction in strength than the 7085Al alloy because:(i)the annihilation of vacancies suppressed the formation of GPII zones,thereby weakening their transition toη’precipitates;(ii)quenching dislocations promoted the coarsening of precipitates.An improved NIA process,incorporating both heating and cooling aging treatments,was effectively designed with the assistance of in-situ SANS technology to address this issue,which allows for achieving strength comparable to that after the T6 treatment with only 15%of the aging time consumption.This research fills the gap in investigating the NIA precipitation behaviors of aluminum matrix composites,providing guidance for the formulation of NIA schedules.展开更多
ropic 1:Regarding sustainable development and global public interests,what should international Al standards focus on?James Ong:Since 2019,I have witnessed the evolution of WAIC and found that a consensus on the philo...ropic 1:Regarding sustainable development and global public interests,what should international Al standards focus on?James Ong:Since 2019,I have witnessed the evolution of WAIC and found that a consensus on the philosophical and ethic level on advocating“AI for humanity”is necessary,since ethics factor carries more weight in standards development.I want to emphasize three points:AI assisting sustainable development,AI empowering a balanced global development,and human-AI coordination for preventing AI risks.展开更多
β-Sialon has emerged as a promising material for enhancing the service life of Al_(2)O_(3)-C refractories due to its excellent physicochemical properties.The impact of varying concentrations of nanometer Al/Si alloy ...β-Sialon has emerged as a promising material for enhancing the service life of Al_(2)O_(3)-C refractories due to its excellent physicochemical properties.The impact of varying concentrations of nanometer Al/Si alloy on the in-situ synthesis of β-Sialon within Al_(2)O_(3)-C refractory materials,as well as its oxidation behavior,was investigated.The findings indicate that the presence of Al/Si alloy promotes the formation of AlN and SiC whiskers at 1300℃,which subsequently facilitate the production of plate-like β-Sialon at 1500℃.Density functional theory analysis reveals that the(020)crystal plane of β-Sialon exhibits the lowest adsorption energy for Al2O and AlO molecules under the influence of iron atoms,suggesting a solid-liquid-vapor growth mechanism for β-Sialon formation.The introduction of these ceramic phases significantly enhances the mechanical properties of Al_(2)O_(3)-C refractories.Specifically,the addition of 6 wt.%Al/Si alloy yielded specimens with the highest cold modulus of rupture and cold crushing strength at 1500℃,achieving values of 35.2 and 127.5 MPa,respectively--representing increases of 40.1%and 37.4%.Furthermore,during high-temperature oxidation,the formation of plate-like β-Sialon leads to the development of a dense protective layer on the surface.This impedes the diffusion pathways of oxygen and consequently enhances the oxidation resistance of the refractory.展开更多
The nano-scale L1_(2)-Ni_(3)Al precipitates significantly contribute to thermal stability of alumina-forming austenitic(AFA)steels.The coarsening behavior of L1_(2)-Ni_(3)Al precipitates in AFA steels during isotherma...The nano-scale L1_(2)-Ni_(3)Al precipitates significantly contribute to thermal stability of alumina-forming austenitic(AFA)steels.The coarsening behavior of L1_(2)-Ni_(3)Al precipitates in AFA steels during isothermal aging with considering the influence of alloying elements was investigated.The results show that the coarsening rate of L1_(2)-Ni_(3)Al precipitates increases with co-additions of Ni and Cu,and especially,the increase of Cu content promotes the nucleation of L1_(2)-Ni_(3)Al precipitates.A dynamic competition exists between Lifshitz-Slyozov-Wagner theory and transient interface diffusion-controlled theory for coarsening behavior of L1_(2)-Ni_(3)Al precipitates with duration of isothermal aging.Additionally,the transition from L1_(2)-Ni_(3)Al precipitates to B2-NiAl precipitates during isothermal aging results in the formation of a depleted zone of L1_(2)-Ni_(3)Al precipitates around B2-NiAl precipitates,which inhibits the growth of L1_(2)-Ni_(3)Al precipitates.The coarsening of L1_(2)-Ni_(3)Al precipitates significantly contributes to the yield strength of AFA steels.展开更多
Because of the challenge of compounding lightweight,high-strength Ti/Al alloys due to their considerable disparity in properties,Al 6063 as intermediate layer was proposed to fabricate TC4/Al 6063/Al 7075 three-layer ...Because of the challenge of compounding lightweight,high-strength Ti/Al alloys due to their considerable disparity in properties,Al 6063 as intermediate layer was proposed to fabricate TC4/Al 6063/Al 7075 three-layer composite plate by explosive welding.The microscopic properties of each bonding interface were elucidated through field emission scanning electron microscope and electron backscattered diffraction(EBSD).A methodology combining finite element method-smoothed particle hydrodynamics(FEM-SPH)and molecular dynamics(MD)was proposed for the analysis of the forming and evolution characteristics of explosive welding interfaces at multi-scale.The results demonstrate that the bonding interface morphologies of TC4/Al 6063 and Al 6063/Al 7075 exhibit a flat and wavy configuration,without discernible defects or cracks.The phenomenon of grain refinement is observed in the vicinity of the two bonding interfaces.Furthermore,the degree of plastic deformation of TC4 and Al 7075 is more pronounced than that of Al 6063 in the intermediate layer.The interface morphology characteristics obtained by FEM-SPH simulation exhibit a high degree of similarity to the experimental results.MD simulations reveal that the diffusion of interfacial elements predominantly occurs during the unloading phase,and the simulated thickness of interfacial diffusion aligns well with experimental outcomes.The introduction of intermediate layer in the explosive welding process can effectively produce high-quality titanium/aluminum alloy composite plates.Furthermore,this approach offers a multi-scale simulation strategy for the study of explosive welding bonding interfaces.展开更多
Al？50%SiC （volume fraction） composites containing different sizesofSiC particles （average sizesof 23, 38 and 75 μm） were prepared by powder metallurgy. The influences of SiC particle sizes and annealing on the p...Al？50%SiC （volume fraction） composites containing different sizesofSiC particles （average sizesof 23, 38 and 75 μm） were prepared by powder metallurgy. The influences of SiC particle sizes and annealing on the propertiesof the compositeswere investigated. The results show that SiC particles are distributed uniformly in the Al matrix. The coarse SiC particles result in higher coefficient of thermal expansion （CTE） and higher thermal conductivity （TC）, while fine SiC particles decrease CTE and improve flexural strength of the composites. The morphology and size of SiC particles in the composite are not influenced by the annealing treatment at 400℃for 6h. However, the CTE and the flexural strength of annealed composites are decreased slightly, and the TCis improved. The TC, CTE and flexural strength of the Al/SiC composite with averageSiC particlesize of75 μm are 156 W/（m·K）, 11.6×10^-6K^-1 and 229 MPa, respectively.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.52235006)the National Key Research and Development Program of China(Grant No.2022YFB4600500)+3 种基金the National Natural Science Foundation of China(Grant Nos.52025053 and 52105303)the Natural Science Foundation of Jilin Province(Grant No.20220101209JC)the Postdoctoral Fellow-ship Program of CPSF(Grant GZC20240587 and GZC20230944)the Graduate Innovation Fund of Jilin University(2024CX063).
文摘1.Introduction.The Ti6Al4V alloy is extensively utilized across various indus-trial sectors due to its favorable characteristics,such as lightweight design,high strength,and resistance to corrosion[1].In effort s to further reduce weight,functional elements like electric actuators can be substituted with intelligent materials like shape memory alloys(SMAs)[2,3].Among SMAs,NiTi alloy stands out for its sens-ing and actuation capabilities,significantly enhancing the safety and reliability of engineering structures[4,5].Integrating Ti6Al4V and NiTi alloys within a single component holds the potential to provide precise feedback on mechanical,thermal,or environmen-tal conditions[6,7].
基金National Natural Science Foundation of China(52275349)Key Research and Development Program of Shandong Province(2021ZLGX01)。
文摘Friction stir lap welding of AA2195 Al-Li alloy and Ti alloy was conducted to investigate the formation,microstructure,and mechanical properties of the joints.Results show that under different welding parameters,with the decrease in welding heat input,the weld surface is smoother.The Ti/Al joint interface is flat without obvious Ti and Al mixed structure,and the hook structure is not formed under optimal parameters.Due to the enhanced breaking effect of the stirring head,the hook structural defects and intermetallic compounds are more likely to form at the Ti/Al interface at high rotational speed of 1000 r/min,thereby deteriorating the mechanical properties of joints.Decreasing the heat input is beneficial to hardness enhancement of the aluminum alloy in the weld nugget zone.Under the optimal parameters of rotation speed of 800 r/min and welding speed of 120 mm/min,the maximum tensile shear strength of joint is 289 N/mm.
基金supported by the National Key Research and Development Program of China(No.SQ2021YFF 0600011).
文摘7039 Al alloys are widely used in armor vehicles,given the material’s high specific strength and fracture toughness.However,laminar tearing in the thickness plane of the base metal(BM),specifically in the normal direction(ND)and rolling direction(RD)plane,was occasionally observed after the welding of thick plates,resulting in premature material failure.A vertically metal-inert gas(MIG)-welded laminar tearing component of a 30 mm thick plate was analyzed to determine the factors associated with this phenomenon.The texture,residual stress,microhardness,and tensile properties were also investigated.The results indicated that the crack extended along the RD as a transcrystalline fracture and terminated at the BM.The grains near the crack grew preferentially in the(001)crystal direction.Furthermore,the tensile strength(83 MPa)and elongation(6.8%)in the RD were relatively higher than those in the ND.In particular,the primary factors for crack initiation include stronger texture,higher dislocation density,increased Al_(7)Cu_(2)Fe phases,lower proportion of small-angle grain boundaries,and varying grain sizes in different regions,leading to the fragile microstructure.The higher residual stress of the BM promotes the formation and extension of cracks.The restraining force due to fixation and welding shrinkage force transformed the crack into laminar tearing.Preventive measures of laminar tearing were also proposed.
基金funded by NIH-NIA R01AG061708 (to PHO)Patrick Grange Memorial Foundation (to PHO)+1 种基金A Long Swim (to PHO)CureSPG4 Foundation (to PHO)。
文摘Developing effective and long-term treatment strategies for rare and complex neurodegenerative diseases is challenging. One of the major roadblocks is the extensive heterogeneity among patients. This hinders understanding the underlying disease-causing mechanisms and building solutions that have implications for a broad spectrum of patients. One potential solution is to develop personalized medicine approaches based on strategies that target the most prevalent cellular events that are perturbed in patients. Especially in patients with a known genetic mutation, it may be possible to understand how these mutations contribute to problems that lead to neurodegeneration. Protein–protein interaction analyses offer great advantages for revealing how proteins interact, which cellular events are primarily involved in these interactions, and how they become affected when key genes are mutated in patients. This line of investigation also suggests novel druggable targets for patients with different mutations. Here, we focus on alsin and spastin, two proteins that are identified as “causative” for amyotrophic lateral sclerosis and hereditary spastic paraplegia, respectively, when mutated. Our review analyzes the protein interactome for alsin and spastin, the canonical pathways that are primarily important for each protein domain, as well as compounds that are either Food and Drug Administration–approved or are in active clinical trials concerning the affected cellular pathways. This line of research begins to pave the way for personalized medicine approaches that are desperately needed for rare neurodegenerative diseases that are complex and heterogeneous.
基金Applied Basic Research Program of Liaoning Province(CN)(2022JH2/101300078)。
文摘Self-designed Al8Si0.4Mg0.4Fe aluminium alloy was modified with Sr,followed by solid solution and aging treatments to regulate its microstructure and mechanical/electrical properties.The results show that after the modification treatment,the room-temperature tensile strength of the alloy remains nearly unchanged,the elongation at break slightly increases from 1.82%to 3.34%,and the electrical conductivity significantly increases from 40.1%international annealed copper standard(IACS)to 42.0%IACS.After the modification,the alloy was subjected to solid solution treatment at 515℃for 8 h,followed by aging treatment at 180,200,220 and 240℃for 6 h.With increasing aging temperature,the electrical conductivity increases monotonously from 41.4%IACS to 45.5%IACS,while the room-temperature tensile strength initially increases and then decreases.At 200℃,the alloy achieves an optimal balance between electrical conductivity and room-temperature tensile strength:the electrical conductivity is 42.5%IACS,and the room-temperature tensile strength is 282.9 MPa.When the aging temperature continues to rise,the alloy undergoes overaging.Although the conductivity continues to increase,the room-temperature tensile strength drops sharply,and it is only 177.1 MPa at 240℃.
基金supported by Shenzhen Science and Technology Program(No.KQTD20200820113010022).
文摘The growth of single-crystalα-Al_(2)O_(3) is crucial for a variety of applications in electronics and other fields,while the synthesis of its two-dimensional(2D)form is not easy due to the high activation energy.Here,we demonstrate the growth of single-crystal 2Dα-Al_(2)O_(3) by high temperature(high-T)annealing of Ni foils.Tens of micrometers of 2Dα-Al_(2)O_(3) flakes grow on the surface of Ni foils,which is attributed to the precipitation of Al atoms from the Ni foil bulk to its surface,followed by the oxidation of Al atoms on the surface.In principle,the Ni foil acts as a solvent,where diluted metal atoms precipitate onto the surface and react with oxygen from the atmosphere to grow single-crystal 2D metal oxides.Our findings may also provide a promising method for synthesizing other single-crystal 2D metal oxides.
基金supported by the Guangxi Science and Technology Program,China(Nos.Guike AD23026170,Guike AD23026116)the Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology,China(No.22-35-4-S019)+3 种基金the Research Basic Ability Enhancement Program for Young and Middle-aged Teachers of Guangxi,China(No.2023KY0202)China Postdoctoral Science Foundation(No.2024M753642)the Guilin Science and Technology Development Program(Project),China(No.20220124-10)the Innovation Project of GUET Graduate Education,China(No.2024YCXS008).
文摘Laser specific energy significantly impacts the quality of composite coatings.Ti−Al/WC coatings were prepared on the TC21 alloy through laser cladding with specific energy ranging from 66.7 to 133.3 J/mm^(2).The results indicate that the composite coatings primarily comprised Ti_(2)AlC,α_(2)-Ti_(3)Al,γ-TiAl,TiC,and W phases.A gradual increase in the relative intensity of the diffraction peaks of Ti_(2)AlC,α_(2)-Ti_(3)Al,and TiC appeared with the increase of specific energy.When the specific energy was 116.7 J/mm^(2),the Ti−Al/WC coated alloy achieved a maximum micro-hardness of HV0.2766.3,which represented an increase of 1.96 times compared with TC21 alloy,and the minimum wear rate decreased dramatically.Much improvement in tribological properties was attained through the fine-grained strengthening of the(α_(2)+γ)matrix and the dispersion strengthening of self-lubricating Ti_(2)AlC and intertwining TiC.This study provides valuable insights for the development of high-performance Ti−Al composite coatings.
基金support by the National Natural Science Foundation of China(Grant Nos.U23A20546 and 52271010)the Chinese National Natural Science Fund for Distinguished Young Scholars(Grant No.52025015)the Natural Science Foundation of Tianjin City(No.21JCZDJC00510).
文摘1.Introduction The strength-ductility trade-offdilemma has long been a per-sistent challenge in Al matrix composites(AMCs)[1,2].This is-sue primarily arises from the agglomeration of reinforcements at the grain boundaries(GBs),which restricts local plastic flow dur-ing the plastic deformation and leads to stress concentration[3,4].Recently,the development of concepts aimed at achieving hetero-geneous grain has emerged as a promising approach for enhanc-ing comprehensive mechanical properties[5,6].
基金supported by the National Key R&D Program of China(No.2022YFB3504401).
文摘Microstructure uniformity of the Al-Nd target materials with Al11 Nd_(3) significantly affects the performance of the fabricated Al-Nd film,which is widely used as wiring material in large-size thin-film transistor liquid crystal display(TFT-LCD)panels.Understanding the inherent mechanical properties and chemical bonds of Al11 Nd_(3) is crucial for homogenizing the Al-Nd target.Here,by a combined experimental and ab-initio theoretical study,the microstructure and deformability of the Al-3wt%Nd alloy and the inherent mechanical properties and chemical bonds of Al11 Nd_(3) were investigated comprehensively.The Al-3wt%Nd alloy is composed of the pre-eutecticα-Al matrix and the eutecticα-Al and a high stableα-Al11 Nd_(3) phase.During the plastic deformation,the eutectic microstructure transforms from a cellular to a lamel-lar shape,while the morphology and dimension ofα-Al11 Nd_(3) are not changed significantly.By examin-ing ideal tensile strength,elastic moduli,hardness and brittleness-ductility,the hardness-brittleness ofα-Al11 Nd_(3) is quantitatively evaluated,accounting for its difficulties of plastic deformation and fragmen-tation.Combining band structure,population analysis,topological analysis and crystal orbital Hamilton population,we found thatα-Al11 Nd_(3) possesses two types of chemical bonds:the Nd-Al and Al-Al bonds.The former is a typical ionic bond with electron transfer from Nd to Al,while the latter,dominated by both 3 s-3 p and 3 p-3 p interactions,is a weak covalent bond.The mixed chemical bond is responsible for the high hardness-brittleness ofα-Al11 Nd_(3).This work is expected to lay a foundation for Al-Nd alloy and catalyze the fabrication of high-quality Al-Nd target materials.
文摘BACKGROUND Hip dysplasia is a widespread and debilitating musculoskeletal disorder that affects children.Its prevalence varies across different nations.AIM To evaluate the prevalence of developmental hip dysplasia(DDH)within the pediatric population of Al Jouf province.METHODS From January 2018 to December 2023,children with DDH from all cities of Al Jouf were included in this retrospective cross-sectional study.The disease prevalence was calculated for the entire province as well as for individual cities within the territory.RESULTS The study included 427 patients with DDH with an overall prevalence of 0.50%,or 5.0 per 1000 live births.At the city level,Sakaka had the highest prevalence at 14.2 per 1000 Live births followed by Qurayyat at 2.2 per 1000 live births.In contrast,cities like Suwayr,Abu Ajram,and Meegowa did not show any incidence of DDH.Significant differences were observed in the sociodemographic characteristics,such as age,sex,and nationality,across the different cities(P<0.05).CONCLUSION The prevalence of DDH in the Al Jouf province is high.The data delivers invaluable insights into the epidemiology of DDH in the Al Jouf locality.The findings highlight the need for targeted screening of DDH across the province.
基金financially supported by the National Key Research and Development Program of China(No.2017YFD0800305)。
文摘As the fundamental unit of soil,aggregates exhibit significant variations in their abilities to adsorb and desorb trace elements,depending on their size.Batch experiments were conducted to investigate the characteristics of adsorption and desorption of cadmium(Cd),copper(Cu),and lead(Pb)on and from soil aggregate fractions from three layers of a calcareous soil profile in Changxing County,Zhejiang Prvince,China.The results showed that both Langmuir and Freundlich models successfully described the isothermal adsorption processes of single Cd,Cu,and Pb on different soil aggregates.Additionally,aggregates from the bottom soil layer showed the highest maximum adsorption capacity and required the lowest energy for Cd,Cu,and Pb adsorption compared to aggregates from upper soil layers.The physicochemical properties of soil aggregates were found to govern the adsorption and desorption processes of heavy metals rather than the aggregate size,wherein the contents of iron/aluminum oxides and organic matter were the most crucial influencing factors.Cadmium displayed higher mobility than Cu and Pb in different soil aggregates,and the maximum adsorption capacities of the metal ions followed the order of Pb>Cu>Cd,while their desorption rates followed the order of Cd>Cu>Pb.Additionally,the<0.053 mm microaggregates presented the lowest desorption rates for Cd,Cu,and Pb compared to other soil aggregate fractions in each soil layer.Furthermore,the orthogonal experiment results demonstrated that the competitive adsorption between metals occurred on soil aggregates in the ternary heavy metal system,but only the desorption of Pb was significantly affected by the coexistence of Cd and Cu.
基金support of the Na-tional Key R&D Program of China(No.2021YFA1600700)the Na-tional Natural Science Foundation of China(grant Nos.U22A20114,52322106,52192595,and 52301200)+2 种基金the Project funded by China Postdoctoral Science Foundation(No.2023M733573)CSNS Con-sortium on High-performance Materials of Chinese Academy of Sciences(No.JZHKYPT-2021-01)the Natural Science Foun-dation of Liaoning Province(No.2023-BS-020)。
文摘Non-isothermal aging(NIA)treatments have presented significant advantages in improving the comprehensive performance and aging hardening efficiency of the 7000 series aluminum alloys,but there is no attention paid to their composites.This study takes a linear heating aging process as an example to reveal the precipitation behaviors of a 15 vol.%SiC/7085Al composite as well as its impact on mechanical properties using differential scanning calorimetry,transmission electron microscopy,small-angle neutron scattering,hardness measurements,and tensile testing.The results indicated the formation of GP(Ⅰ,Ⅱ)zones,η’andηprecipitates in sequence,leading to the hardness and strength initially increasing and then decreasing with rising NIA temperatures.The maximums were reached at 183℃,corresponding to the appearance ofη’precipitates in large quantities.Owing to the rapid temperature rise during the NIA process,the precipitates entered the coarsening and redissolution stage before they were entirely formed,resulting in reduced peak strength compared to the T6 treatment.The composite exhibited a more significant reduction in strength than the 7085Al alloy because:(i)the annihilation of vacancies suppressed the formation of GPII zones,thereby weakening their transition toη’precipitates;(ii)quenching dislocations promoted the coarsening of precipitates.An improved NIA process,incorporating both heating and cooling aging treatments,was effectively designed with the assistance of in-situ SANS technology to address this issue,which allows for achieving strength comparable to that after the T6 treatment with only 15%of the aging time consumption.This research fills the gap in investigating the NIA precipitation behaviors of aluminum matrix composites,providing guidance for the formulation of NIA schedules.
文摘ropic 1:Regarding sustainable development and global public interests,what should international Al standards focus on?James Ong:Since 2019,I have witnessed the evolution of WAIC and found that a consensus on the philosophical and ethic level on advocating“AI for humanity”is necessary,since ethics factor carries more weight in standards development.I want to emphasize three points:AI assisting sustainable development,AI empowering a balanced global development,and human-AI coordination for preventing AI risks.
基金supported by the Natural Science Foundation of Henan Province(No.232300420329)Key Scientific Research Project of Colleges and Universities in Henan Province(Nos.23B430012,22A430028,and 25B430022)+2 种基金Henan Provincial Science and Technology Research Project(No.242102231064)National Natural Science Foundation of China(No.52202064)Luoyang Major Science and Technology Innovation Project(No.2301009A).
文摘β-Sialon has emerged as a promising material for enhancing the service life of Al_(2)O_(3)-C refractories due to its excellent physicochemical properties.The impact of varying concentrations of nanometer Al/Si alloy on the in-situ synthesis of β-Sialon within Al_(2)O_(3)-C refractory materials,as well as its oxidation behavior,was investigated.The findings indicate that the presence of Al/Si alloy promotes the formation of AlN and SiC whiskers at 1300℃,which subsequently facilitate the production of plate-like β-Sialon at 1500℃.Density functional theory analysis reveals that the(020)crystal plane of β-Sialon exhibits the lowest adsorption energy for Al2O and AlO molecules under the influence of iron atoms,suggesting a solid-liquid-vapor growth mechanism for β-Sialon formation.The introduction of these ceramic phases significantly enhances the mechanical properties of Al_(2)O_(3)-C refractories.Specifically,the addition of 6 wt.%Al/Si alloy yielded specimens with the highest cold modulus of rupture and cold crushing strength at 1500℃,achieving values of 35.2 and 127.5 MPa,respectively--representing increases of 40.1%and 37.4%.Furthermore,during high-temperature oxidation,the formation of plate-like β-Sialon leads to the development of a dense protective layer on the surface.This impedes the diffusion pathways of oxygen and consequently enhances the oxidation resistance of the refractory.
基金financial supports from the National Natural Science Foundation of China(Nos.52471004,52171107,52201203)the Industry-University-Research Cooperation Project of Hebei Based Universities and Shijiazhuang City(No.241791237A)the Fundamental Research Funds for the Central Universities(No.N2423030)。
文摘The nano-scale L1_(2)-Ni_(3)Al precipitates significantly contribute to thermal stability of alumina-forming austenitic(AFA)steels.The coarsening behavior of L1_(2)-Ni_(3)Al precipitates in AFA steels during isothermal aging with considering the influence of alloying elements was investigated.The results show that the coarsening rate of L1_(2)-Ni_(3)Al precipitates increases with co-additions of Ni and Cu,and especially,the increase of Cu content promotes the nucleation of L1_(2)-Ni_(3)Al precipitates.A dynamic competition exists between Lifshitz-Slyozov-Wagner theory and transient interface diffusion-controlled theory for coarsening behavior of L1_(2)-Ni_(3)Al precipitates with duration of isothermal aging.Additionally,the transition from L1_(2)-Ni_(3)Al precipitates to B2-NiAl precipitates during isothermal aging results in the formation of a depleted zone of L1_(2)-Ni_(3)Al precipitates around B2-NiAl precipitates,which inhibits the growth of L1_(2)-Ni_(3)Al precipitates.The coarsening of L1_(2)-Ni_(3)Al precipitates significantly contributes to the yield strength of AFA steels.
基金Opening Foundation of Key Laboratory of Explosive Energy Utilization and Control,Anhui Province(BP20240104)Graduate Innovation Program of China University of Mining and Technology(2024WLJCRCZL049)Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX24_2701)。
文摘Because of the challenge of compounding lightweight,high-strength Ti/Al alloys due to their considerable disparity in properties,Al 6063 as intermediate layer was proposed to fabricate TC4/Al 6063/Al 7075 three-layer composite plate by explosive welding.The microscopic properties of each bonding interface were elucidated through field emission scanning electron microscope and electron backscattered diffraction(EBSD).A methodology combining finite element method-smoothed particle hydrodynamics(FEM-SPH)and molecular dynamics(MD)was proposed for the analysis of the forming and evolution characteristics of explosive welding interfaces at multi-scale.The results demonstrate that the bonding interface morphologies of TC4/Al 6063 and Al 6063/Al 7075 exhibit a flat and wavy configuration,without discernible defects or cracks.The phenomenon of grain refinement is observed in the vicinity of the two bonding interfaces.Furthermore,the degree of plastic deformation of TC4 and Al 7075 is more pronounced than that of Al 6063 in the intermediate layer.The interface morphology characteristics obtained by FEM-SPH simulation exhibit a high degree of similarity to the experimental results.MD simulations reveal that the diffusion of interfacial elements predominantly occurs during the unloading phase,and the simulated thickness of interfacial diffusion aligns well with experimental outcomes.The introduction of intermediate layer in the explosive welding process can effectively produce high-quality titanium/aluminum alloy composite plates.Furthermore,this approach offers a multi-scale simulation strategy for the study of explosive welding bonding interfaces.
基金Project support by the 2015 Shandong Province Project for Outstanding Subject Talent Group,China
文摘Al？50%SiC （volume fraction） composites containing different sizesofSiC particles （average sizesof 23, 38 and 75 μm） were prepared by powder metallurgy. The influences of SiC particle sizes and annealing on the propertiesof the compositeswere investigated. The results show that SiC particles are distributed uniformly in the Al matrix. The coarse SiC particles result in higher coefficient of thermal expansion （CTE） and higher thermal conductivity （TC）, while fine SiC particles decrease CTE and improve flexural strength of the composites. The morphology and size of SiC particles in the composite are not influenced by the annealing treatment at 400℃for 6h. However, the CTE and the flexural strength of annealed composites are decreased slightly, and the TCis improved. The TC, CTE and flexural strength of the Al/SiC composite with averageSiC particlesize of75 μm are 156 W/（m·K）, 11.6×10^-6K^-1 and 229 MPa, respectively.
