摘要：Multi-wall carbon nanotube filled shape memory polymer composite(MWCNT/SMC)possessed enhanced modulus,strength,and electric conductivity,as well as excellent electrothermal shape memory properties,showing wide design scenarios and engineering application *** thermoelectrically triggered shape memory process contains complex multi-physical mechanisms,especially when coupled with finite deformation rooted on micro-mechanisms.A multi-physical finite deformation model is necessary to get a deep understanding on the coupled electro-thermomechanical properties of electrothermal shape memory composites(ESMCs),beneficial to its design and wide *** into consideration of micro-physical mechanisms of the MWCNTs interacting with double-chain networks,a finite deformation theoretical model is developed in this work based on two superimposed network chains of physically crosslinked network formed among MWCNTs and the chemically crosslinked *** intact crosslinked chemical network is considered featuring with entropic-hyperelastic properties,superimposed with a physically crosslinked network where percolation theory is based on electric conductivity and electric-heating *** model is calibrated by experiments and used for shape recoveries triggered by heating and electric *** captures the coupled electro-thermomechanical behavior of ESMCs and provides design guidelines for MWCNTs filled shape memory polymers.

摘要：本文建立了一种基于跨阻抗前置放大器的磁传感器信号传递模型,并在该模型的基础上推导出磁传感器的灵敏度和噪声理论值.根据理论推导的结果,进一步研究了感应式磁传感器设计方法,以带宽0.01~10 kHz,噪声1 fT·Hz^(–1/2)(1~10 kHz)作为设计目标设计了一个感应式磁传感器,并对这一传感器进行了性能验证试验.在处理频率响应测试数据时设计了一种基于信号调制的处理方法,有效提取特定频率得到幅值和相位,并降低了随机噪声的干扰,磁传感器–3 dB带宽达到了0.01~10 kHz.在评估传感器噪声时,采用双探头差分的方法消除了环境的干扰,设计了相位差分析的评估方法,确认在哪些频带双探头探测的信号是同源的,在这些频带采用差分法评估是有效的.评估的结果是,传感器在1~10 kHz实现了1 fT·Hz^(–1/2)噪声水平.

摘要：本文探讨了远程信道设计技术在电力配用电自动化系统中的应用,强调了其在提高系统集成度、保障电力系统高效稳定运行方面的重要性。通过对比不同通信信道技术的性能指标,推荐了EPON光纤专网作为通信信道,原因是其在可靠性、稳定性、实时性、安全性等方面具有显著优势。此外,文中还讨论了设备配置、分光器选择、ONU设备取电方式以及设备安装位置等关键技术点,以确保系统的全面性和精准性。

摘要：力学超材料(或超结构)因其独特的微观结构设计而展现超常的物理和力学特性.将力学超材料设计思想与智能柔性(简称智柔)材料相结合,可以制备出具有自感知和自驱动功能的智柔力学超材料(简称智柔超材料).本文对近年来智柔超材料的研究现状和进展进行了评述,分析了此类材料的基本设计思想、变形机理及力学特性,重点关注了基于形状记忆聚合物和水凝胶智柔超材料的设计原理和性能分析方法;阐释了先进制造技术为智柔超材料发展带来的机遇,并讨论了此类材料在设计和开发方面面临的关键问题以及未来发展趋势.

摘要：高温岩石力学特性是煤炭地下气化等岩石工程围岩稳定分析和支护设计的重要依据。为揭示高温后岩石断裂特性,对两组不同孔隙率砂岩进行高温(25~800℃)处理,采用图像处理技术获得砂岩热裂纹分布特征,探究高温后砂岩微裂纹面积比演化规律;对高温后砂岩进行三点弯曲试验,分析高温对砂岩载荷-位移曲线、Ⅰ型断裂韧度及破裂模式的影响规律。结果表明:高温后砂岩微裂纹面积比随温度升高呈先减小后增大趋势,较高孔隙率C组砂岩微裂纹面积比更大;相同温度条件下,A组砂岩Ⅰ型断裂韧度高于C组砂岩;随着温度的升高,两组砂岩Ⅰ型断裂韧度均先增大后减小,阈值温度分别为200℃和400℃;三点弯曲作用下,从预制裂隙尖端萌生的裂纹扩展导致砂岩试样破坏,且温度越高,砂岩破坏程度越明显。

摘要：中奖概率和奖品价值是影响个体参与抽奖意愿的两个关键维度。基于此,设计出“小概率/大价值”和“大概率/小价值”两种抽奖组合,并设计了三个心理学实验,以揭示在线抽奖概率/价值维度、运气信念和不中次数对个体参与抽奖意愿的影响。研究结果显示:(1)相比大概率/小价值组合,人们普遍更偏爱小概率/大价值组合,从而验证了在线抽奖决策过程存在小概率高估的事实,也阐明了人们热衷参与小概率/大价值在线抽奖活动的基本原理。(2)运气信念对人们的在线抽奖选择具有一定调节作用,运气信念低的个体更倾向于选择大概率/小价值的在线抽奖活动,运气信念高的个体则更喜欢小概率/大价值的锦鲤类抽奖活动。(3)对多次不中仍继续参与在线抽奖的现象进行研究,发现运气信念与奖品价值/概率在初次参与抽奖时存在交互效应,但多次参与抽奖不中后这种交互效应消失,此时即使高信念水平的个体也不再热衷于大价值/小概率的抽奖。这一结论为企业更好地开展抽奖促销活动、消费者更理性的抽奖决策以及政府对抽奖销售更有效的监管均提供了重要启示。

摘要：铁路客站高质量发展及旅客的精神需求对客站建设设计提出更高要求。从文化与客站造型、客站空间的融合,文化的输出与创新等角度,对昌景黄高铁新建中小型客站的空间功能、文化呈现、绿色智能等方面的设计实践与创新进行分析,阐明文化的融入是铁路客站创造丰富空间的契机,新质文化的践行与探索是现阶段客站高质量发展的必然之路,文化的有效表达与创新对提升客站品质,增强旅客体验感具有积极作用。

摘要：随着全球铁路运输业的快速发展,各国在列车涂装设计方面的研究也日益深入。色彩作为设计中最具影响力的元素之一,在列车涂装中的应用不仅涉及美学价值,更涉及心理学、社会文化等多重维度。本文旨在对列车涂装色彩心理进行研究,首先,参考色彩应用的历程,总结色彩在不同时期的使用特点,再围绕着色彩的个性化倾向、情感意向、文化意向三个方面对色彩心理理论进行综述。最后通过研究列车涂装技术要求,概括列车涂装的相关技术标准,总结列车的涂装流程和涂装设计的特点。针对列车涂装设计中的要素进行深入探究,指出应该进一步加强色彩心理设计策略、文化元素等方面的思考,形成人群—线路—文化多要素设计方法。

摘要：提出一种在实验室消声水池环境下对声学多普勒流速剖面仪(ADCP)进行校准的方法。通过发射仿真回波信号,利用频率和延时时间实现量值溯源,进而实现对流速和深度的校准。研制了一套ADCP水池校准系统,以2波束614.4 kHz ADCP为校准对象,设计不同的流速分布实现对水层流速校准,探究底跟踪信号非限幅下的校准,设计多波束和单波束对比实验。对底跟踪速度进行不确定度评定,结果表明,在0~2.5 m/s速度下,不确定度最大为2.30 mm/s,验证了该校准方法的可行性。

摘要：Gradual distraction with an external fixator is a widely used treatment for severe postburn ankle contracture(SPAC).However,application of external fixators is complex,and conventional two-dimensional(2D)imaging-based surgical planning is not particularly helpful due to a lack of spatial *** purpose of this study was to evaluate the surgical planning process for this procedure with patient-specific three-dimension-printed models(3DPMs).In this study,patients coming from two centers were divided into two cohorts(3DPM group *** group)depending on whether a 3DPM was used for preoperative surgical *** duration,improvement in metatarsal-tibial angle(MTA),range of motion(ROM),the American Orthopedic Foot and Ankle Society(AOFAS)scores,complications,and patient-reported satisfaction were compared between two *** 3DPM group had significantly shorter operation duration than the control group((2.0±0.3)h vs.(3.2±0.3)h,P<0.01).MTA,ROM,and AOFAS scores between the two groups showed no significant differences pre-operation,after the removal of the external fixator,or at *** feet were achieved and gait was substantially improved in all patients at the final ***-tract infections occurred in two patients(one in each group)during distraction and were treated with wound care and oral *** in the 3DPM group reported higher satisfaction than those in the control group,owing to better patient-surgeon *** planning using patient-specific 3DPMs significantly reduced operation duration and increased patient satisfaction,while providing similar improvements in ankle movement and function compared to traditional surgical planning for the correction of SPAC with external fixators.