Objective:To assess the efficacy and safety of Qixuekang oral liquid in the treatment of leukopenia during chemotherapy and radiotherapy.Methods:This randomized,double-blind,placebo-controlled,multicenter clinical tri...Objective:To assess the efficacy and safety of Qixuekang oral liquid in the treatment of leukopenia during chemotherapy and radiotherapy.Methods:This randomized,double-blind,placebo-controlled,multicenter clinical trial was conducted between July 2018 and May 2021.A total of 234 patients with malignant tumors were enrolled from 12 medical centers.They were randomly assigned to receive either Qixuekang oral liquid or placebo in addition to standard chemotherapy and radiotherapy,with a treatment duration≤42 days.The primary outcome was defined as the change in peripheral white blood cell(WBC)count,determined by routine laboratory hematology tests,from baseline(D-7 to D0)to Day 42(±2 days)of dosing(D42).Results:In the full analysis set comprising 227 patients(113 and 114 in the experimental and control groups,respectively),a significant reduction in WBC count was observed after treatment(P.05).Conclusion:Qixuekang oral liquid may exert a therapeutic effect in mitigating leukopenia induced by chemotherapy and radiotherapy,while exhibiting favorable safety profiles.展开更多
Alzheimer's disease(AD)is a progressive neurodegenerative disorder characterized by complex pathological features such as amyloid-β plaques and tau tangles.Early and accurate diagnosis is crucial for effective in...Alzheimer's disease(AD)is a progressive neurodegenerative disorder characterized by complex pathological features such as amyloid-β plaques and tau tangles.Early and accurate diagnosis is crucial for effective intervention,yet remains challenging.This review focuses on current and emerging imaging modalities used in AD detection,including positron emission tomography,single-photon emission computed tomography,magnetic resonance imaging(MRI),fluorescence imaging,photoacoustic imaging,and mass spectrometry imaging,with an emphasis on their mechanisms,advantages,and limitations.Special attention is given to the integration of nanotechnology with imaging platforms,highlighting how nanomaterials enhance diagnostic specificity,sensitivity,stability and therapeutic potential.The review also explores recent advances in multimodal imaging,artificial intelligence-assisted diagnostics,and future directions toward personalized and other non-invasive strategies for early AD diagnosis.展开更多
With the advancement of microelectronics,semiconductors,and nanotechnology,thin-film materials have found extensive applications in electronic and optical components.The thin-film thickness serves as a critical parame...With the advancement of microelectronics,semiconductors,and nanotechnology,thin-film materials have found extensive applications in electronic and optical components.The thin-film thickness serves as a critical parameter affecting the performance and reliability of such components.For rapid,non-destructive,and precise thickness measurements,generalized ellipsometers have attracted considerable research.However,commercially available ellipsometers typically require two motors to realize the variable angle(one to control the polarization state generator/analyzer,and another to rotate the sample stage).This conventional design suffers from complex structure,high cost and difficulty in optical path calibration after angle variation.To address these limitations,a novel variable angle structure driven by single motor is proposed in this paper,in which the polarization state generator is fixed and the polarization state analyzer and the sample stage are driven simultaneously using single motor to realize the variable angle.Using the developed system,standard thin-film samples of Au,Ag,and Cu,each with a nominal thickness of 50 nm,were tested.The results indicated that the thicknesses of the three samples fell within the range of 50±2 nm.Furthermore,the system exhibited minimal measurement error at an incident angle of 70°.These findings demonstrate that the proposed ellipsometry system with variable angle driven by single motor offers higher integration,simpler operation,and lower cost compared to traditional dual-motor designs.展开更多
Ultrahigh-strength medium-Mn steels are one of the promising third-generation advanced high-strength steels with strength-ductility-toughness synergy.However,it has been a challenge to preserve the superior mechanical...Ultrahigh-strength medium-Mn steels are one of the promising third-generation advanced high-strength steels with strength-ductility-toughness synergy.However,it has been a challenge to preserve the superior mechanical properties of ultrahigh-strength medium-Mn steels after fusion welding due to the high heat input-induced transformation of metastable microstructures.In this work,ultrahigh-strength medium-Mn steel plates with 1 GPa strength were joined by a solid-state welding technique—friction stir welding.Defect-free joints were fabricated under a specific parameter window.Transformation of austenite to quenched martensite with high hardness occurred in the nugget zones(NZs).All the as-welded joints exhibited equal strengths but significant losses in ductility compared to the base metal(BM).Moreover,the impact energies of the NZs were greatly reduced to less than 6 J,which induced premature failures of the joints.After post-weld annealing at an intercritical temperature,reverse transformation of austenite occurred in the NZs,producing a composited structure of ultrafine ferrite,martensite,and austenite.The impact energies of the annealed NZs increased to over 23 J,which was much higher than the 2.2 J measured in the as-welded counterparts.The hardness of the NZs was significantly reduced,enabling sizeable tensile elongations of the joints close to that of the BM.Consequently,enhanced strength-ductility-toughness synergy of ultrahigh-strength medium-Mn steel joints was achieved by post-weld annealing.This work demonstrates a viable method to fabricate ultrahigh-strength medium-Mn steel joints with high performance.展开更多
Organic thin-film transistors(OTFTs)are widely recognized as promising building blocks for nextgeneration flexible and wearable electronics.However,scalable fabrication of high-density OTFT arrays for activematrix app...Organic thin-film transistors(OTFTs)are widely recognized as promising building blocks for nextgeneration flexible and wearable electronics.However,scalable fabrication of high-density OTFT arrays for activematrix applications remains highly challenging,primarily due to the incompatibility of conventional photolithography with organic semiconductors.Here,we report an all-photolithographic strategy that enables the scalable fabrication of flexible OTFT arrays with both high device density and superior charge transport characteristics.By combining synergistic interfacial modulation and dual-protection photolithography strategy of organic semiconductors,we successfully fabricated transistor arrays exhibiting an average mobility above 1.0 cm2 V−1 s−1 and on/off ratios of~105.This scalable method further enables an integration density of 6.25×104 cm−2,which is one of the highest densities reported to date for full-photolithographic OTFT active-matrix arrays.Moreover,we demonstrate seamless integration of OTFT active-matrix arrays with organic light-emitting diodes(OLEDs),yielding all-organic active-matrix OLED(AMOLED)arrays.These devices exhibit stable electroluminescence,ultralight weight(~24.3 g m−2),excellent flexibility,and skinlike display functionality with reliable pixel-level addressing.This work establishes a universal and scalable route toward high-density organic electronic systems,opening new opportunities for flexible displays,electronic skin,and next-generation wearable technologies.展开更多
Background:This study aims to investigate the therapeutic potential of rare ginsenosides(HTS)derived from Panax quinquefolius stem-leaf saponins(AGS)on LM infected mice,and to explore its synergistic anti LM mechanism...Background:This study aims to investigate the therapeutic potential of rare ginsenosides(HTS)derived from Panax quinquefolius stem-leaf saponins(AGS)on LM infected mice,and to explore its synergistic anti LM mechanism with its Panax quinquefolius polysaccharides(AGP).The mechanism by which AGP enhances the efficacy of rare ginsenosides is also explored through macrophage polarization.Methods:HTS was separated from total ginseng saponins;AGP was characterized using UV-Vis,IR spectroscopy,and monosaccharide composition analysis.An in vivo mouse model of LM infection was established,with penicillin and negative control groups.Efficacy was assessed by survival rate,organ bacterial load,ALT levels,inflammatory cytokines,and histopathology.An in vitro model used LTA-induced RAW264.7 macrophages,with NF-κB,CD68,and CD163 mRNA levels detected via qRT-PCR and immunofluorescence.Results:High-dose HTS(20 mg/kg)alone resulted in only 16.7%survival and significant liver injury.In contrast,HTS(5 mg/kg)and AGP(5 mg/kg)co-administration significantly increased survival to 66.7%,reduced hepatic bacterial load and ALT,downregulated IFN-γand IL-1β,and alleviated liver pathology.In vitro,HTS+AGP reduced LTA-induced cytotoxicity,suppressed NF-κB activation,and decreased secretion of NO,TNF-α,and IL-6.It also reversed the LTA-induced M1 macrophage bias by downregulating CD68 and upregulating CD163,increasing the CD163+/CD68+ ratio.Conclusion:AGP can enhance the therapeutic effect of HTS on LM infection by alleviating excessive inflammatory response in infected mice,regulating macrophage polarization balance,and providing experimental basis and theoretical support for the development of new anti-resistant bacterial strategies based on natural active ingredients and the rational application of rare saponins.展开更多
Additive manufacturing provides an opportunity to efficiently produce the structure-performance integrated forming of aluminum alloy components,which has long been a primary objective in the aerospace and automobile i...Additive manufacturing provides an opportunity to efficiently produce the structure-performance integrated forming of aluminum alloy components,which has long been a primary objective in the aerospace and automobile industries.However,achieving nearly fully dense additive manufacturing of high-strength aluminum alloys remains a major challenge because of their high cracking sensitivity.In this study,an Al-Fe-V-Si-Sc alloy was designed and prepared by laser powder bed fusion(LPBF).The extremely high cooling rate and thermal gradient during the LPBF process facilitate the formation of a unique hierarchical heterostructure.The amorphous/crystal composite structure,located at the molten pool center,along with various nanoscale precipitates present at the molten pool boundary,can provide strengthening effects to this alloy,thereby conferring ultrahigh strength on the alloy at both room temperature and elevated temperatures.These findings offer valuable insights into the design of additively manufactured aluminum alloys,holding great promise for the advancement of aerospace components.展开更多
The influence of Ga doping on the structure and mechanical properties of B2-CuZr phase reinforced larger-size CuZrAlY metallic glass composites was investigated by experiments and simulations.The result showed that as...The influence of Ga doping on the structure and mechanical properties of B2-CuZr phase reinforced larger-size CuZrAlY metallic glass composites was investigated by experiments and simulations.The result showed that as Ga content increased,the glass-forming ability of CuZrAlY metallic glass composites was gradually enhanced.Section morphology and thermal analysis indicated that Ga doping induced the decreased content of the crystals and the enlargement of the super-cooled liquid region,and increased activation energy for crystallization.Ga also stabilized the B2-CuZr phase.Characterization of the microstructure and mechanical test results suggested that the B19'-CuZr phase disappeared in the as-cast samples after adding Ga,and the martensitic transformation of the B2-CuZr phase was hindered when Ga content increased.The evolution mechanism of mechanical behaviors of the CuZr-based metallic glass composites during Ga doping was clarified by first-principles calculation.The results would be beneficial to the development and application of large-size CuZr-based metallic glass composites.展开更多
This study analyzed through-thickness distribution of residual stress in a 106 mm ultra-thick TC4 titanium alloy electron beam welded(EBW)joint after post weld heat treatment(PWHT)using X-ray diffraction(XRD)and deep-...This study analyzed through-thickness distribution of residual stress in a 106 mm ultra-thick TC4 titanium alloy electron beam welded(EBW)joint after post weld heat treatment(PWHT)using X-ray diffraction(XRD)and deep-hole drilling(DHD)methods,and investigated the microstructure and mechanical properties.During the PWHT at 600℃,a phase transformation(β→α)occurred in the EBW joint and affected the residual stress distribution and mechanical properties.The surface residual stress was mainly compressive stress,while the internal residual stress was mainly tensile stress in the welded joint.For the as-welded joint,the absolute value of surface residual stress was higher than the absolute value of internal residual stress.After PWHT,the residual stress in the treated joint was substantially reduced compared to the as-welded joint,particularly the surface stress,which relieved from−425 to−90 MPa.However,the residual stress relief effect had minimal positive impact on the internal region at 600℃.PWHT resulted in a shift of the joint fracture location from the fusion zone(FZ)to the base metal(BM),and therefore exerted no noticeable effect on the joint strength,but increased the joint elongation significantly.This study provides valuable insights into the regulation of residual stress distribution of ultra-thick titanium alloy plates.展开更多
The effect of thermal degradation on the welded hybrid joints of metal and polymer composites is insufficient,which seriously inhibits the engineering applications of the joints.In this study,robust hybrid joints of m...The effect of thermal degradation on the welded hybrid joints of metal and polymer composites is insufficient,which seriously inhibits the engineering applications of the joints.In this study,robust hybrid joints of metal and polymer composites were fabricated by the combination of friction lap welding(FLW)and laser surface treatment for investigating the effect of accelerated aging on the joint properties.Results showed that the FLW hybrid joints without laser surface treatment exhibited 91%reduction in the tensile shear force(TSF)after 7 days of accelerated aging tests.In contrast,the FLW hybrid joints with suitable laser surface treatment exhibited only 26%reduction in TSF even after 35 days of accelerated aging tests.Fractures of the tensile specimens occurred across the composite plates rather than along the joint interface.The enhanced reliability of the hybrid joints was mainly attributed to(1)the formation of micro-mechanical interlocking between the polymer composites and aluminum alloy plate,and(2)the modification of the stress distribution along the joint interface.展开更多
The effects of Zr addition on the mechanical properties and in vitro degradation behavior of Mg-1.0Yb-xZr(x=0,0.2,1.0,and 1.53,wt.%)cast alloys were investigated.The results indicated that with increasing Zr addition,...The effects of Zr addition on the mechanical properties and in vitro degradation behavior of Mg-1.0Yb-xZr(x=0,0.2,1.0,and 1.53,wt.%)cast alloys were investigated.The results indicated that with increasing Zr addition,a much refined and homogeneous equiaxed grain structure was achieved from a typical columnar grain structure,in companion with the appearance and coarsening of Zr-rich particles.Subsequent electrochemical and immersion tests demonstrated that the corrosion of the alloy was Zr-addition dependent.A trace or excessive Zr addition caused severe localized corrosion attacks,whereas Zr-free and 1.0 Zr alloyed counterparts were generally corroded uniformly.The good combination of mechanical properties and corrosion resistance of the Mg-1.0Yb-1.0Zr alloy was resulted from the refined and homogeneous equiaxed grain structure and fine dispersed Zr-rich particles,thus improving the comprehensive mechanical properties by grain refinement and reducing corrosion rate by generating a more stable and compact passivation layer during long-term immersion.展开更多
The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl alloys.However,it is a huge challenge to design an alloy with good hot-deformability as w...The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl alloys.However,it is a huge challenge to design an alloy with good hot-deformability as well as the full-lamellar structure.The low-cost Ti-42.5Al-2Mn-0.4Mo-0.1B-0.1C(at.%)alloy was designed,which undergoes bothβandαsingle-phase region during the solidification.It is found that the full-lamellar structure can be obtained by the solution heat treatment at 1230℃ for 20 min and then aging treatment at 800℃ for 3 h.Interestingly,a new microstructure,namely,the pearlitic-like microstructure(PM)induced by theα2/γ→βo+γcellular reaction was observed when the aging temperature is increased to above 800℃.The volume fraction of the PM is gradually increased from 0%to 25.5%,65%,and 94%according to elevated aging temperature from 800 to 900,1000,and 1050℃,respectively.The mechanism of the reducedα2/γlamellae and PM formation was discussed regarding the heterogeneous distribution ofβstabilizing elements and the interface energy stored inα2/γlamellae.展开更多
目的采用范围综述的方法总结智慧护理在孕产妇母乳喂养中应用的现状、影响及结局指标,指出现有研究的不足,为未来研究及临床实践提供参考。方法本研究对6个数据库进行检索,具体包括Web of Science、PubMed、ProQuest、中国知网、万方数...目的采用范围综述的方法总结智慧护理在孕产妇母乳喂养中应用的现状、影响及结局指标,指出现有研究的不足,为未来研究及临床实践提供参考。方法本研究对6个数据库进行检索,具体包括Web of Science、PubMed、ProQuest、中国知网、万方数据知识服务平台、中国生物医学文献数据库。检索时限:自建库之日至2025年7月6日。结果最终纳入40篇文献。智慧护理形式呈现多样性,包括宣教视频、应用程序(application,App)、微信、电话咨询、社交媒体等。智慧护理在孕产妇母乳喂养中应用的结局指标包括母乳喂养指标、行为指标、婴儿指标和生活相关指标等。结论智慧护理对提高孕产妇纯母乳喂养率、改善母乳喂养态度及提升母乳喂养自我效能感等方面有积极作用,但是也可能会使孕产妇的智能手机成瘾水平升高。基于智慧护理的孕产妇母乳喂养App数量逐渐增多。母乳喂养可以促进母婴互动,进一步增进母婴感情。此外,母乳喂养可以提高护理满意度及健康教育满意度等。展开更多
Erratum to:International Journal of Minerals,Metallurgy and Materials Volume 31,Number 11,November 2024,Page 2498 http://gffzzd3cc09b8251d45dfs990u65bk660p6bxn.ffgz.tsg.suse.edu.cn/10.1007/s12613-024-2847-2 In this article,the fund number in the acknowledgements has b...Erratum to:International Journal of Minerals,Metallurgy and Materials Volume 31,Number 11,November 2024,Page 2498 http://gffzzd3cc09b8251d45dfs990u65bk660p6bxn.ffgz.tsg.suse.edu.cn/10.1007/s12613-024-2847-2 In this article,the fund number in the acknowledgements has been erroneously given as the Program for Guangdong Basic and Applied Basic Research Foundation,China(No.2021A151511006)It should be as follows:the Program for Guangdong Basic and Applied Basic Research Foundation,China(No.2021A1515110061).展开更多
基金funded by the National Natural Science Foundation of China(81573915 and 81973640)the Scientific and Technological Innovation Project of the China Academy of Chinese Medical Sciences(CI2021B009).
摘要Objective:To assess the efficacy and safety of Qixuekang oral liquid in the treatment of leukopenia during chemotherapy and radiotherapy.Methods:This randomized,double-blind,placebo-controlled,multicenter clinical trial was conducted between July 2018 and May 2021.A total of 234 patients with malignant tumors were enrolled from 12 medical centers.They were randomly assigned to receive either Qixuekang oral liquid or placebo in addition to standard chemotherapy and radiotherapy,with a treatment duration≤42 days.The primary outcome was defined as the change in peripheral white blood cell(WBC)count,determined by routine laboratory hematology tests,from baseline(D-7 to D0)to Day 42(±2 days)of dosing(D42).Results:In the full analysis set comprising 227 patients(113 and 114 in the experimental and control groups,respectively),a significant reduction in WBC count was observed after treatment(P.05).Conclusion:Qixuekang oral liquid may exert a therapeutic effect in mitigating leukopenia induced by chemotherapy and radiotherapy,while exhibiting favorable safety profiles.
基金supported by Key Research and Development Project of Sichuan Provincial Science and Technology Plan(No.2024YFFK0249)Open Research Project from Anhui Provincial Key Laboratory of Tumor Evolution and Intelligent Diagnosis and Treatment(No.KFKT202405)Scientific and Technological Research Program of Chongqing Municipal Education Commission(No.KJQN202400202)。
摘要Alzheimer's disease(AD)is a progressive neurodegenerative disorder characterized by complex pathological features such as amyloid-β plaques and tau tangles.Early and accurate diagnosis is crucial for effective intervention,yet remains challenging.This review focuses on current and emerging imaging modalities used in AD detection,including positron emission tomography,single-photon emission computed tomography,magnetic resonance imaging(MRI),fluorescence imaging,photoacoustic imaging,and mass spectrometry imaging,with an emphasis on their mechanisms,advantages,and limitations.Special attention is given to the integration of nanotechnology with imaging platforms,highlighting how nanomaterials enhance diagnostic specificity,sensitivity,stability and therapeutic potential.The review also explores recent advances in multimodal imaging,artificial intelligence-assisted diagnostics,and future directions toward personalized and other non-invasive strategies for early AD diagnosis.
基金funded by the Central Government Guidance Funds for Local Science and Technology Development Project YDZJSX2025D041。
摘要With the advancement of microelectronics,semiconductors,and nanotechnology,thin-film materials have found extensive applications in electronic and optical components.The thin-film thickness serves as a critical parameter affecting the performance and reliability of such components.For rapid,non-destructive,and precise thickness measurements,generalized ellipsometers have attracted considerable research.However,commercially available ellipsometers typically require two motors to realize the variable angle(one to control the polarization state generator/analyzer,and another to rotate the sample stage).This conventional design suffers from complex structure,high cost and difficulty in optical path calibration after angle variation.To address these limitations,a novel variable angle structure driven by single motor is proposed in this paper,in which the polarization state generator is fixed and the polarization state analyzer and the sample stage are driven simultaneously using single motor to realize the variable angle.Using the developed system,standard thin-film samples of Au,Ag,and Cu,each with a nominal thickness of 50 nm,were tested.The results indicated that the thicknesses of the three samples fell within the range of 50±2 nm.Furthermore,the system exhibited minimal measurement error at an incident angle of 70°.These findings demonstrate that the proposed ellipsometry system with variable angle driven by single motor offers higher integration,simpler operation,and lower cost compared to traditional dual-motor designs.
基金supported by the National Natural Science Foundation of China(Nos.52171057,52301067,and 52034005)the IMR Innovation Fund(No.2023-PY18)the LingChuang Research Project of China National Nuclear Corporation(No.CNNC-LCKY-202270).
摘要Ultrahigh-strength medium-Mn steels are one of the promising third-generation advanced high-strength steels with strength-ductility-toughness synergy.However,it has been a challenge to preserve the superior mechanical properties of ultrahigh-strength medium-Mn steels after fusion welding due to the high heat input-induced transformation of metastable microstructures.In this work,ultrahigh-strength medium-Mn steel plates with 1 GPa strength were joined by a solid-state welding technique—friction stir welding.Defect-free joints were fabricated under a specific parameter window.Transformation of austenite to quenched martensite with high hardness occurred in the nugget zones(NZs).All the as-welded joints exhibited equal strengths but significant losses in ductility compared to the base metal(BM).Moreover,the impact energies of the NZs were greatly reduced to less than 6 J,which induced premature failures of the joints.After post-weld annealing at an intercritical temperature,reverse transformation of austenite occurred in the NZs,producing a composited structure of ultrafine ferrite,martensite,and austenite.The impact energies of the annealed NZs increased to over 23 J,which was much higher than the 2.2 J measured in the as-welded counterparts.The hardness of the NZs was significantly reduced,enabling sizeable tensile elongations of the joints close to that of the BM.Consequently,enhanced strength-ductility-toughness synergy of ultrahigh-strength medium-Mn steel joints was achieved by post-weld annealing.This work demonstrates a viable method to fabricate ultrahigh-strength medium-Mn steel joints with high performance.
基金supported by National Natural Science Foundation of China(grant Nos.62225403,62522402 and 62375046)Science and Technology Development Plan Project of Jilin Province,China(grant No.***202502021JC)+1 种基金National Key R&D Program of China(grant Nos.2022YFF1202700 and 2022YFB3203500)111 Project(grant No.B13013).
摘要Organic thin-film transistors(OTFTs)are widely recognized as promising building blocks for nextgeneration flexible and wearable electronics.However,scalable fabrication of high-density OTFT arrays for activematrix applications remains highly challenging,primarily due to the incompatibility of conventional photolithography with organic semiconductors.Here,we report an all-photolithographic strategy that enables the scalable fabrication of flexible OTFT arrays with both high device density and superior charge transport characteristics.By combining synergistic interfacial modulation and dual-protection photolithography strategy of organic semiconductors,we successfully fabricated transistor arrays exhibiting an average mobility above 1.0 cm2 V−1 s−1 and on/off ratios of~105.This scalable method further enables an integration density of 6.25×104 cm−2,which is one of the highest densities reported to date for full-photolithographic OTFT active-matrix arrays.Moreover,we demonstrate seamless integration of OTFT active-matrix arrays with organic light-emitting diodes(OLEDs),yielding all-organic active-matrix OLED(AMOLED)arrays.These devices exhibit stable electroluminescence,ultralight weight(~24.3 g m−2),excellent flexibility,and skinlike display functionality with reliable pixel-level addressing.This work establishes a universal and scalable route toward high-density organic electronic systems,opening new opportunities for flexible displays,electronic skin,and next-generation wearable technologies.
基金supported by fund from National Nature Foundation(Grant No.32102106)Innovation Team of Youth Innovation Science and Technology Plan of Shandong Province(2022KJ343)the Program for Taishan Scholar(Grant No.tsqn202211232).
摘要Background:This study aims to investigate the therapeutic potential of rare ginsenosides(HTS)derived from Panax quinquefolius stem-leaf saponins(AGS)on LM infected mice,and to explore its synergistic anti LM mechanism with its Panax quinquefolius polysaccharides(AGP).The mechanism by which AGP enhances the efficacy of rare ginsenosides is also explored through macrophage polarization.Methods:HTS was separated from total ginseng saponins;AGP was characterized using UV-Vis,IR spectroscopy,and monosaccharide composition analysis.An in vivo mouse model of LM infection was established,with penicillin and negative control groups.Efficacy was assessed by survival rate,organ bacterial load,ALT levels,inflammatory cytokines,and histopathology.An in vitro model used LTA-induced RAW264.7 macrophages,with NF-κB,CD68,and CD163 mRNA levels detected via qRT-PCR and immunofluorescence.Results:High-dose HTS(20 mg/kg)alone resulted in only 16.7%survival and significant liver injury.In contrast,HTS(5 mg/kg)and AGP(5 mg/kg)co-administration significantly increased survival to 66.7%,reduced hepatic bacterial load and ALT,downregulated IFN-γand IL-1β,and alleviated liver pathology.In vitro,HTS+AGP reduced LTA-induced cytotoxicity,suppressed NF-κB activation,and decreased secretion of NO,TNF-α,and IL-6.It also reversed the LTA-induced M1 macrophage bias by downregulating CD68 and upregulating CD163,increasing the CD163+/CD68+ ratio.Conclusion:AGP can enhance the therapeutic effect of HTS on LM infection by alleviating excessive inflammatory response in infected mice,regulating macrophage polarization balance,and providing experimental basis and theoretical support for the development of new anti-resistant bacterial strategies based on natural active ingredients and the rational application of rare saponins.
基金supported by the National Natural Science Foundation of China(Nos.U21A2043,and U22A20129)the Youth Innovation Promotion Association,CAS(No.2022191).
摘要Additive manufacturing provides an opportunity to efficiently produce the structure-performance integrated forming of aluminum alloy components,which has long been a primary objective in the aerospace and automobile industries.However,achieving nearly fully dense additive manufacturing of high-strength aluminum alloys remains a major challenge because of their high cracking sensitivity.In this study,an Al-Fe-V-Si-Sc alloy was designed and prepared by laser powder bed fusion(LPBF).The extremely high cooling rate and thermal gradient during the LPBF process facilitate the formation of a unique hierarchical heterostructure.The amorphous/crystal composite structure,located at the molten pool center,along with various nanoscale precipitates present at the molten pool boundary,can provide strengthening effects to this alloy,thereby conferring ultrahigh strength on the alloy at both room temperature and elevated temperatures.These findings offer valuable insights into the design of additively manufactured aluminum alloys,holding great promise for the advancement of aerospace components.
基金supported by the Guangdong Basic and Applied Basic Research Foundation,China(No.2020A1515110065).
摘要The influence of Ga doping on the structure and mechanical properties of B2-CuZr phase reinforced larger-size CuZrAlY metallic glass composites was investigated by experiments and simulations.The result showed that as Ga content increased,the glass-forming ability of CuZrAlY metallic glass composites was gradually enhanced.Section morphology and thermal analysis indicated that Ga doping induced the decreased content of the crystals and the enlargement of the super-cooled liquid region,and increased activation energy for crystallization.Ga also stabilized the B2-CuZr phase.Characterization of the microstructure and mechanical test results suggested that the B19'-CuZr phase disappeared in the as-cast samples after adding Ga,and the martensitic transformation of the B2-CuZr phase was hindered when Ga content increased.The evolution mechanism of mechanical behaviors of the CuZr-based metallic glass composites during Ga doping was clarified by first-principles calculation.The results would be beneficial to the development and application of large-size CuZr-based metallic glass composites.
基金supported by the National Key Research and Development Program of China(No.2023YFC2810700)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(2021193)the Science and Technology Cooperation Project between Jilin Province and Chinese Academy of Sciences(No.2024SYHZ0032).
摘要This study analyzed through-thickness distribution of residual stress in a 106 mm ultra-thick TC4 titanium alloy electron beam welded(EBW)joint after post weld heat treatment(PWHT)using X-ray diffraction(XRD)and deep-hole drilling(DHD)methods,and investigated the microstructure and mechanical properties.During the PWHT at 600℃,a phase transformation(β→α)occurred in the EBW joint and affected the residual stress distribution and mechanical properties.The surface residual stress was mainly compressive stress,while the internal residual stress was mainly tensile stress in the welded joint.For the as-welded joint,the absolute value of surface residual stress was higher than the absolute value of internal residual stress.After PWHT,the residual stress in the treated joint was substantially reduced compared to the as-welded joint,particularly the surface stress,which relieved from−425 to−90 MPa.However,the residual stress relief effect had minimal positive impact on the internal region at 600℃.PWHT resulted in a shift of the joint fracture location from the fusion zone(FZ)to the base metal(BM),and therefore exerted no noticeable effect on the joint strength,but increased the joint elongation significantly.This study provides valuable insights into the regulation of residual stress distribution of ultra-thick titanium alloy plates.
基金supported by the National Natural Science Foundation of China(No.51975553)the Liaoning Natural Science Foundation of China(Nos.2021-MS-007 and 2021-YQ-01)the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2021193).
摘要The effect of thermal degradation on the welded hybrid joints of metal and polymer composites is insufficient,which seriously inhibits the engineering applications of the joints.In this study,robust hybrid joints of metal and polymer composites were fabricated by the combination of friction lap welding(FLW)and laser surface treatment for investigating the effect of accelerated aging on the joint properties.Results showed that the FLW hybrid joints without laser surface treatment exhibited 91%reduction in the tensile shear force(TSF)after 7 days of accelerated aging tests.In contrast,the FLW hybrid joints with suitable laser surface treatment exhibited only 26%reduction in TSF even after 35 days of accelerated aging tests.Fractures of the tensile specimens occurred across the composite plates rather than along the joint interface.The enhanced reliability of the hybrid joints was mainly attributed to(1)the formation of micro-mechanical interlocking between the polymer composites and aluminum alloy plate,and(2)the modification of the stress distribution along the joint interface.
基金the financial supports from the China Scholarship Council(No.201808505057)。
摘要The effects of Zr addition on the mechanical properties and in vitro degradation behavior of Mg-1.0Yb-xZr(x=0,0.2,1.0,and 1.53,wt.%)cast alloys were investigated.The results indicated that with increasing Zr addition,a much refined and homogeneous equiaxed grain structure was achieved from a typical columnar grain structure,in companion with the appearance and coarsening of Zr-rich particles.Subsequent electrochemical and immersion tests demonstrated that the corrosion of the alloy was Zr-addition dependent.A trace or excessive Zr addition caused severe localized corrosion attacks,whereas Zr-free and 1.0 Zr alloyed counterparts were generally corroded uniformly.The good combination of mechanical properties and corrosion resistance of the Mg-1.0Yb-1.0Zr alloy was resulted from the refined and homogeneous equiaxed grain structure and fine dispersed Zr-rich particles,thus improving the comprehensive mechanical properties by grain refinement and reducing corrosion rate by generating a more stable and compact passivation layer during long-term immersion.
基金the Jihua Laboratory Scientific Research Project(No.X210291TL210)the National Natural Science Foundation of China(No.51971215).
摘要The high strength and stability of the full-lamellar structure guarantee the industrial application of theβ-solidifyingγ-TiAl alloys.However,it is a huge challenge to design an alloy with good hot-deformability as well as the full-lamellar structure.The low-cost Ti-42.5Al-2Mn-0.4Mo-0.1B-0.1C(at.%)alloy was designed,which undergoes bothβandαsingle-phase region during the solidification.It is found that the full-lamellar structure can be obtained by the solution heat treatment at 1230℃ for 20 min and then aging treatment at 800℃ for 3 h.Interestingly,a new microstructure,namely,the pearlitic-like microstructure(PM)induced by theα2/γ→βo+γcellular reaction was observed when the aging temperature is increased to above 800℃.The volume fraction of the PM is gradually increased from 0%to 25.5%,65%,and 94%according to elevated aging temperature from 800 to 900,1000,and 1050℃,respectively.The mechanism of the reducedα2/γlamellae and PM formation was discussed regarding the heterogeneous distribution ofβstabilizing elements and the interface energy stored inα2/γlamellae.
摘要目的采用范围综述的方法总结智慧护理在孕产妇母乳喂养中应用的现状、影响及结局指标,指出现有研究的不足,为未来研究及临床实践提供参考。方法本研究对6个数据库进行检索,具体包括Web of Science、PubMed、ProQuest、中国知网、万方数据知识服务平台、中国生物医学文献数据库。检索时限:自建库之日至2025年7月6日。结果最终纳入40篇文献。智慧护理形式呈现多样性,包括宣教视频、应用程序(application,App)、微信、电话咨询、社交媒体等。智慧护理在孕产妇母乳喂养中应用的结局指标包括母乳喂养指标、行为指标、婴儿指标和生活相关指标等。结论智慧护理对提高孕产妇纯母乳喂养率、改善母乳喂养态度及提升母乳喂养自我效能感等方面有积极作用,但是也可能会使孕产妇的智能手机成瘾水平升高。基于智慧护理的孕产妇母乳喂养App数量逐渐增多。母乳喂养可以促进母婴互动,进一步增进母婴感情。此外,母乳喂养可以提高护理满意度及健康教育满意度等。
摘要Erratum to:International Journal of Minerals,Metallurgy and Materials Volume 31,Number 11,November 2024,Page 2498 http://gffzzd3cc09b8251d45dfs990u65bk660p6bxn.ffgz.tsg.suse.edu.cn/10.1007/s12613-024-2847-2 In this article,the fund number in the acknowledgements has been erroneously given as the Program for Guangdong Basic and Applied Basic Research Foundation,China(No.2021A151511006)It should be as follows:the Program for Guangdong Basic and Applied Basic Research Foundation,China(No.2021A1515110061).