摘要：The problems associated with vibrations of viaducts and low-frequency structural noise radiation caused by train excitation continue to increase in importance.A new floating-slab track vibration isolator-non-obstructive particle damping-phononic crystal vibration isolator is proposed herein,which uses the particle damping vibration absorption technology and bandgap vibration control *** vibration reduction performance of the NOPD-PCVI was analyzed from the perspective of vibration *** paper explores the structure-borne noise reduction performance of the NOPD-PCVIs installed on different bridge structures under varying service conditions encountered in practical engineering *** load transferred to the bridge is obtained from a coupled train-FST-bridge analytical model considering the different structural parameters of *** vibration responses are obtained using the finite element method,while the structural noise radiation is simulated using the frequency-domain boundary element *** the particle swarm optimization algorithm,the parameters of the NOPD-PCVI are optimized so that its frequency bandgap matches the dominant bridge structural noise frequency *** noise reduction performance of the NOPD-PCVIs is compared to the steel-spring isolation under different service conditions.

摘要：Based on the building principle of additive manufacturing,printing orientation mainly determines the tribological properties of joint *** this study,we created a polyether-ether-ketone(PEEK)joint prosthesis using fused filament fabrication and investigated the effects of printing orientation on its tribological properties using a pin-on-plate tribometer in 25% newborn calf *** ultrahigh molecular weight polyethylene transfer film is formed on the surface of PEEK due to the mechanical capture of wear debris by the 3D-printed groove morphology,which is significantly impacted by the printing orientation of *** the printing orientation was parallel to the sliding direction of friction,the number and size of the transfer film increased due to higher steady *** transfer film protected the matrix and reduced the friction coefficient and wear rate of friction pairs by 39.13%and 74.33%,***,our findings provide a novel perspective regarding the role of printing orientation in designing knee prostheses,facilitating its practical applications.

摘要：Recently,the increasing interest in wearable technology for personal healthcare and smart virtual/augmented reality applications has led to the development of facile fabrication *** have long been used to develop original solutions to such challenging technological problems due to their remote,sterile,rapid,and site-selective processing of *** this review,recent developments in relevant laser processes are summarized under two separate ***,transformative approaches,such as for laser-induced graphene,are *** addition to design optimization and the alteration of a native substrate,the latest advances under a transformative approach now enable more complex material compositions and multilayer device configurations through the simultaneous transformation of heterogeneous precursors,or the sequential addition of functional layers coupled with other electronic *** addition,the more conventional laser techniques,such as ablation,sintering,and synthesis,can still be used to enhance the functionality of an entire system through the expansion of applicable materials and the adoption of new ***,various wearable device components developed through the corresponding laser processes are discussed,with an emphasis on chemical/physical sensors and energy *** addition,special attention is given to applications that use multiple laser sources or processes,which lay the foundation for the all-laser fabrication of wearable devices.

摘要：Conventional blood sampling for glucose detection is prone to cause pain and fails to continuously record glucose fluctuations in *** glucose monitoring based on implantable electrodes could induce pain and potential tissue inflammation,and the presence of reactive oxygen species(ROS)due to inflammationmay affect glucose *** technology is less invasive,yet microneedle adhesion with skin tissue is *** this work,we developed a microarrow sensor array(MASA),which provided enhanced skin surface adhesion and enabled simultaneous detection of glucose and H_(2)O_(2)(representative of ROS)in interstitial fluid in *** microarrows fabricated via laser micromachining were modified with functional coating and integrated into a patch of a three-dimensional(3D)microneedle *** to the arrow tip mechanically interlocking with the tissue,the microarrow array could better adhere to the skin surface after penetration into *** MASA was demonstrated to provide continuous in vivo monitoring of glucose and H_(2)O_(2) concentrations,with the detection of H_(2)O_(2) providing a valuable reference for assessing the inflammation ***,the MASA was integrated into a monitoring system using custom *** work provides a promising tool for the stable and reliable monitoring of blood glucose in diabetic patients.

摘要：Traditional tumor models do not tend to accurately simulate tumor growth in vitro or enable personalized treatment and are particularly unable to discover more beneficial targeted *** address this,this study describes the use of threedimensional(3D)bioprinting technology to construct a 3D model with human hepatocarcinoma SMMC-7721 cells(3DP-7721)by combining gelatin methacrylate(GelMA)and poly(ethylene oxide)(PEO)as two immiscible aqueous phases to form a bioink and innovatively applying fluorescent carbon quantum dots for long-term tracking of *** GelMA(10%,mass fraction)and PEO(1.6%,mass fraction)hydrogel with 3:1 volume ratio offered distinct pore-forming characteristics,satisfactorymechanical properties,and biocompatibility for the creation of the 3DP-7721 *** analysis and quantitative real-time fluorescence polymerase chain reaction(PCR)were used to evaluate the biological properties of the *** with the two-dimensional culture cell model(2D-7721)and the 3D mixed culture cell model(3DM-7721),3DP-7721 significantly improved the proliferation of cells and expression of tumor-related proteins and ***,we evaluated the differences between the three culture models and the effectiveness of antitumor drugs in the three models and discovered that the efficacy of antitumor drugs varied because of significant differences in resistance proteins and genes between the three *** addition,the comparison of tumor formation in the three models found that the cells cultured by the 3DP-7721 model had strong tumorigenicity in nude *** evaluation of the levels of biochemical indicators related to the formation of solid tumors showed that the 3DP-7721 model group exhibited pathological characteristics of malignant tumors,the generated solid tumors were similar to actual tumors,and the deterioration was *** research therefore acts as a foundation for the application of 3DP-7721 models in drug devel

摘要：高效光电探测器在监控、热成像、光通信和环境监测等领域具有广泛、迫切的应用需求.优化光电探测器参数如微型化、高量子效率、超快响应速度等,仍然是一项艰巨的任务.我们提出了一种由顶部/底部MoTe_(2)和中间Ta_(2)NiSe_(5)层组成的双范德华异质结.利用双异质结界面增强光收集效率和产生两个对立的内置电场,使得器件具有400到1550 nm的宽光谱响应,并表现出优异的性能,包括82.9%的外量子效率和3.5/4.2μs的快速响应速度.此外,利用二维Ta_(2)NiSe_(5)纳米片的面内各向异性,我们实现了在635和1550 nm波长下的极化灵敏度,分别为16.3和8.1.这项研究为开发高性能和多功能光电探测器提供了平台,为先进光电器件的设计和应用提供了新的方向.

摘要：通过将采热管群与充填采矿技术相结合可提取矿井中的地热能,有效缓解高地热带来的热害问题。本文以采热管群为研究对象,分析了充填体放热过程中传热流体的温度、速度和压力分布,讨论了雷诺数、管径、管间距和管排方式对采热管群性能的影响。结果表明:当雷诺数从100增加到5000时,换热量从2.24×10^(3)kJ增加到16.78×10^(3)kJ,综合评价因子从0.087增加到1.31。当管径从4 mm增加到6 mm时,换热量从15.07×10^(3)kJ增加到17.11×10^(3)kJ,综合评价因子从1.157增加到1.388。当管间距从130 mm增加到170 mm时,换热量从14.24×10^(3)kJ增加到16.25×10^(3)kJ,综合评价因子从1.013增加到1.263。此外,四路并联布置可以保证较高的换热量和较低的压降,从而获得较高的综合评价因子。该研究为充填体中采热管群的设计和优化提供了理论参考。

摘要：本工作利用基于密度泛函理论的高通量计算方法,研究了由金属团簇和四羟基苯(THB)分子形成的232个具有Kagome晶格的有机金属网格.在由THB分子和过渡金属原子三聚体(称为Y_(3)-THB)组成的有机金属网格中,有7种网格结构是本征有机拓扑绝缘体.进一步引入过渡金属原子(Tl,Pb,Bi)后得到的X_(3)Y_(4)-THB结构中,发现了9个具有较大自旋轨道耦合能隙的本征有机拓扑绝缘体.在这些本征拓扑绝缘体中,α相Pb_(3)Zn_(4)-THB结构是具有拓扑平带的拓扑绝缘体,其非平庸自旋轨道耦合能隙(97.5 meV)几乎是其平带带宽(22.5 meV)的4倍,是实现分数量子霍尔效应的理想平台.该工作为设计具有大能隙的二维有机拓扑绝缘体提供了新的途径.

摘要：将细胞封装在生物材料中用于器官修复或疾病治疗是一个新兴领域.目前,微流控技术被用于精确控制封装细胞的数量、大小和支架结构.微流控技术提供了设计生物仿生形态的能力,增强封装细胞的活性和功能,从而提高疾病治疗的效果.本文报道了微流控技术在仿生细胞封装方面的最新进展.我们首先简要概述了各种天然衍生的促进细胞功能的仿生结构,如受到细胞、植物、动物和自然反应启发的结构;之后讨论了基于微技术的最新细胞封装方法,并详细描述了相关过程;最后提出了仿生细胞封装在疾病治疗和临床应用中面临的挑战和未来方向.

摘要：Bone screws are devices used to fix implants or bones to ***,conventional screws are mechanically fixed with thread and often face long-term failure due to poor *** improve osseointegration,screws are evolving from solid and smooth to porous and *** manufacturing(AM)offers a high degree of manufacturing freedom,enabling the preparation of predesigned screws that are porous and *** paper provides an overview of the problems currently faced by bone screws:long-term loosening and screw ***,advances in osseointegrated screws are summarized hierarchically(sub-micro,micro,and macro).At the sub-microscale level,we describe surface-modification techniques for enhancing *** the micro level,we summarize the micro-design parameters that affect the mechanical and biological properties of porous osseointegrated screws,including porosity,pore size,and pore *** addition,we highlight three promising pore shapes:triply periodic minimal surface,auxetic structure with negative Poisson ratio,and the Voronoi *** the macro level,we outline the strategies of graded design,gradient design,and topology optimization design to improve the mechanical strength of porous osseointegrated ***,this paper outlines advances in AM technology for enhancing the mechanical properties of porous osseointegrated *** osseointegrated screws with hierarchical design are expected to provide excellent long-term fixation and the required mechanical strength.