Silicon(Si)is considered one of the most promising anode materials for next-generation lithium-ion batteries due to its ultrahigh theoretical capacity.However,its application is significantly limited by severe volume ...Silicon(Si)is considered one of the most promising anode materials for next-generation lithium-ion batteries due to its ultrahigh theoretical capacity.However,its application is significantly limited by severe volume expansion,leading to structural degradation and poor cycling stability.Polymer binders play a critical role in addressing these issues by providing mechanical stabilization.Inspired by the mechanically adaptive architecture of spider webs,where stiff radial threads and extensible spiral threads act in synergy,a dual-thread architecture polymer binder(PALT)with energy dissipation ability enabled by integrating rigid and flexible domains is designed.The rigid poly(acrylic acid lithium)(PAALi)segments offer structural reinforcement,while the soft segments(poly(lipoic acid-tannic acid),LT)introduce dynamic covalent bonds and multiple hydrogen bonds that function as reversible sacrificial bonds,enhancing energy dissipation during cycling.Comprehensive experimental and computational analyses demonstrate effectively reduced stress concentration,improved structural integrity,and stable electrochemical performance over prolonged cycling.The silicon anode incorporating the PALT binder exhibits a satisfying capacity loss per cycle of 0.042% during 350 charge/discharge cycles at 3580 m A g^(-1).This work highlights a bioinspired binder design strategy that combines intrinsic rigidity with dynamic stress adaptability to advance the mechanical and electrochemical stability of silicon anodes.展开更多
The electromagnetic wave absorption of silicon carbide nanowires is improved by their uniform and diverse cross-structures.This study introduces a sustainable and high value-added method for synthesizing silicon carbi...The electromagnetic wave absorption of silicon carbide nanowires is improved by their uniform and diverse cross-structures.This study introduces a sustainable and high value-added method for synthesizing silicon carbide nanowires using lignite and waste silicon powder as raw materials through carbothermal reduction.The staggered structure of nanowires promotes the creation of interfacial polarization,impedance matching,and multiple loss mechanisms,leading to enhanced electromagnetic absorption performance.The silicon carbide nanowires demonstrate outstanding electromagnetic absorption capabilities with the minimum reflection loss of-48.09 d B at10.08 GHz and an effective absorption bandwidth(the reflection loss less than-10 d B)ranging from 8.54 to 16.68 GHz with a thickness of 2.17 mm.This research presents an innovative approach for utilizing solid waste in an environmentally friendly manner to produce broadband silicon carbide composite absorbers.展开更多
To fully utilize the resources provided by optical fiber networks,a cross-band quantum light source generating photon pairs,where one photon in a pair is at C band and the other is at O band,is proposed in this work.T...To fully utilize the resources provided by optical fiber networks,a cross-band quantum light source generating photon pairs,where one photon in a pair is at C band and the other is at O band,is proposed in this work.This source is based on spontaneous four-wave mixing(SFWM)in a piece of shallow-ridge silicon waveguide.Theoretical analysis shows that the waveguide dispersion could be tailored by adjusting the ridge width,enabling broadband photon pair generation by SFWM across C band and O band.The spontaneous Raman scattering(SpRS)in silicon waveguides is also investigated experimentally.It shows that there are two regions in the spectrum of generated photons from SpRS,which could be used to achieve cross-band photon pair generation.A chip of shallow-ridge silicon waveguide samples with different ridge widths has been fabricated,through which cross-band photon pair generation is demonstrated experimentally.The experimental results show that the source can be achieved using dispersion-optimized shallow-ridge silicon waveguides.This cross-band quantum light source provides a way to develop new fiber-based quantum communication functions utilizing both C band and O band and extends applications of quantum networks.展开更多
基于失效物理(Physics of Failure,PoF)分析方法,提出了规范化的系统级封装(System in Package,SiP)产品的可靠性评价标准。完成了国内外基于失效物理的SiP可靠性评价方法的适用性分析,并利用计算机仿真技术和手段设计了包含模型构建、...基于失效物理(Physics of Failure,PoF)分析方法,提出了规范化的系统级封装(System in Package,SiP)产品的可靠性评价标准。完成了国内外基于失效物理的SiP可靠性评价方法的适用性分析,并利用计算机仿真技术和手段设计了包含模型构建、应力剖面分析、可靠性预计与寿命预测等在内的SiP可靠性评价总体方案,给出了基于失效物理的SiP可靠性评价标准中的核心内容,包括评价流程、工作内容及详细要求等。还探讨了评价方案在某型SiP实际产品中的应用情况,表明该方案有效性强且工程适用,与基于加速寿命试验的产品可靠性评价结果吻合度较高,研究成果有助于解决当期SiP可靠性评价缺乏统一有效方法、评价针对性差、寿命试验周期长、缺乏失效数据、试验成本高等难题。展开更多
为了在“互联网 + 非遗”的时代浪潮下更好地应对挑战、把握机遇,非遗文创产品营销策略必须进行革新突破,以提升市场竞争力。本文依据SIPS模型和非遗文创产品营销的现存问题,从共鸣、确认、参与、扩散四个维度提出非遗文创产品营销优化...为了在“互联网 + 非遗”的时代浪潮下更好地应对挑战、把握机遇,非遗文创产品营销策略必须进行革新突破,以提升市场竞争力。本文依据SIPS模型和非遗文创产品营销的现存问题,从共鸣、确认、参与、扩散四个维度提出非遗文创产品营销优化思路,即非遗文化赋能,塑造品牌形象;多元主体协同,拓宽开发渠道;社群互动分享,增强服务体验;跨域传播推广,构建社媒矩阵。In order to better cope with challenges and seize opportunities under the era of “Internet + intangible cultural heritage”, the marketing strategy of non-heritage creative products must be innovated and broken through to enhance market competitiveness. Based on the SIPS model and the existing problems in the marketing of non-heritage products, this paper puts forward the optimization idea of marketing of non-heritage products from four dimensions of resonance, confirmation, participation and diffusion, that is, the empowerment of intangible cultural heritage and the shaping of brand image;Multiple subjects cooperate to broaden development channels;Community interaction and sharing, enhance co-creation experience;Cross-domain dissemination and promotion, construction of media matrix.展开更多
基金the National Natural Science Foundation of China(32201497)for the financial support of this research。
文摘Silicon(Si)is considered one of the most promising anode materials for next-generation lithium-ion batteries due to its ultrahigh theoretical capacity.However,its application is significantly limited by severe volume expansion,leading to structural degradation and poor cycling stability.Polymer binders play a critical role in addressing these issues by providing mechanical stabilization.Inspired by the mechanically adaptive architecture of spider webs,where stiff radial threads and extensible spiral threads act in synergy,a dual-thread architecture polymer binder(PALT)with energy dissipation ability enabled by integrating rigid and flexible domains is designed.The rigid poly(acrylic acid lithium)(PAALi)segments offer structural reinforcement,while the soft segments(poly(lipoic acid-tannic acid),LT)introduce dynamic covalent bonds and multiple hydrogen bonds that function as reversible sacrificial bonds,enhancing energy dissipation during cycling.Comprehensive experimental and computational analyses demonstrate effectively reduced stress concentration,improved structural integrity,and stable electrochemical performance over prolonged cycling.The silicon anode incorporating the PALT binder exhibits a satisfying capacity loss per cycle of 0.042% during 350 charge/discharge cycles at 3580 m A g^(-1).This work highlights a bioinspired binder design strategy that combines intrinsic rigidity with dynamic stress adaptability to advance the mechanical and electrochemical stability of silicon anodes.
基金supported by the National Natural Science Foundation of China(No.52436008)the Inner Mongolia Science and Technology Projects,China(Nos.JMRHZX20210003 and 2023YFCY0009)+3 种基金the Huaneng Group Co Ltd.,China(No.HNKJ23-H50)the National Natural Science Foundation of China(No.22408044)the China Postdoctoral Science Foundation(No.2024M761877)the National Key R&D Program of China(No.SQ2024YFD2200039)。
文摘The electromagnetic wave absorption of silicon carbide nanowires is improved by their uniform and diverse cross-structures.This study introduces a sustainable and high value-added method for synthesizing silicon carbide nanowires using lignite and waste silicon powder as raw materials through carbothermal reduction.The staggered structure of nanowires promotes the creation of interfacial polarization,impedance matching,and multiple loss mechanisms,leading to enhanced electromagnetic absorption performance.The silicon carbide nanowires demonstrate outstanding electromagnetic absorption capabilities with the minimum reflection loss of-48.09 d B at10.08 GHz and an effective absorption bandwidth(the reflection loss less than-10 d B)ranging from 8.54 to 16.68 GHz with a thickness of 2.17 mm.This research presents an innovative approach for utilizing solid waste in an environmentally friendly manner to produce broadband silicon carbide composite absorbers.
基金supported by the Quantum Science and Technology-National Science and Technology Major Project (Grant No.2024ZD0302502 for WZ)the National Natural Science Foundation of China(Grant No.92365210 for WZ)+1 种基金Tsinghua Initiative Scientific Research Program (for WZ)the project of Tsinghua University-Zhuhai Huafa Industrial Share Company Joint Institute for Architecture Optoelectronic Technologies (JIAOT,for YH)。
文摘To fully utilize the resources provided by optical fiber networks,a cross-band quantum light source generating photon pairs,where one photon in a pair is at C band and the other is at O band,is proposed in this work.This source is based on spontaneous four-wave mixing(SFWM)in a piece of shallow-ridge silicon waveguide.Theoretical analysis shows that the waveguide dispersion could be tailored by adjusting the ridge width,enabling broadband photon pair generation by SFWM across C band and O band.The spontaneous Raman scattering(SpRS)in silicon waveguides is also investigated experimentally.It shows that there are two regions in the spectrum of generated photons from SpRS,which could be used to achieve cross-band photon pair generation.A chip of shallow-ridge silicon waveguide samples with different ridge widths has been fabricated,through which cross-band photon pair generation is demonstrated experimentally.The experimental results show that the source can be achieved using dispersion-optimized shallow-ridge silicon waveguides.This cross-band quantum light source provides a way to develop new fiber-based quantum communication functions utilizing both C band and O band and extends applications of quantum networks.
文摘基于失效物理(Physics of Failure,PoF)分析方法,提出了规范化的系统级封装(System in Package,SiP)产品的可靠性评价标准。完成了国内外基于失效物理的SiP可靠性评价方法的适用性分析,并利用计算机仿真技术和手段设计了包含模型构建、应力剖面分析、可靠性预计与寿命预测等在内的SiP可靠性评价总体方案,给出了基于失效物理的SiP可靠性评价标准中的核心内容,包括评价流程、工作内容及详细要求等。还探讨了评价方案在某型SiP实际产品中的应用情况,表明该方案有效性强且工程适用,与基于加速寿命试验的产品可靠性评价结果吻合度较高,研究成果有助于解决当期SiP可靠性评价缺乏统一有效方法、评价针对性差、寿命试验周期长、缺乏失效数据、试验成本高等难题。
文摘为了在“互联网 + 非遗”的时代浪潮下更好地应对挑战、把握机遇,非遗文创产品营销策略必须进行革新突破,以提升市场竞争力。本文依据SIPS模型和非遗文创产品营销的现存问题,从共鸣、确认、参与、扩散四个维度提出非遗文创产品营销优化思路,即非遗文化赋能,塑造品牌形象;多元主体协同,拓宽开发渠道;社群互动分享,增强服务体验;跨域传播推广,构建社媒矩阵。In order to better cope with challenges and seize opportunities under the era of “Internet + intangible cultural heritage”, the marketing strategy of non-heritage creative products must be innovated and broken through to enhance market competitiveness. Based on the SIPS model and the existing problems in the marketing of non-heritage products, this paper puts forward the optimization idea of marketing of non-heritage products from four dimensions of resonance, confirmation, participation and diffusion, that is, the empowerment of intangible cultural heritage and the shaping of brand image;Multiple subjects cooperate to broaden development channels;Community interaction and sharing, enhance co-creation experience;Cross-domain dissemination and promotion, construction of media matrix.
