Modeling muscle wrapping and mass flow using a mass-variable multibody formulation

Multibody System Dynamics - Skeletal muscles usually wrap over multiple anatomical features, and their mass moves along the curved muscle paths during human locomotion. However, existing...     

基于多属性效用匹配的应急案例检索方法研究*

案例推理是一种依靠历史案例经验来指导人们认识和解决问题的方法,比较适用于信息缺失却需要快速反应的应急决策领域。鉴于非常规突发事件与常规突发事件存在诸多差异,在应急案例库中很难检索到与当前所发生的非常规事件相似的案例,从而可能导致应急案例检索系统失效。为了解决这一难题,首先把非常规突发事件按照时间序列划分成若干阶段,对每一阶段的特定子事件即常规突发事件进行匹配与检索。随后以证据理论为主要工具,构建基于多属性效用匹配的应急案例检索模型并求解算法,为应急决策提供技术支持。最后的实例分析验证了所建模型的有效性和可行性。     

Black Phosphorus Quantum Dots Encapsulated Biodegradable Hollow Mesoporous MnO2: Dual-Modality Cancer Imaging and Synergistic Chemo-Phototherapy

To achieve an accurate diagnosis and efficient tumor treatment, developing a facile and powerful strategy to build multifunctional nanotheranostics is highly desirable. Benefiting from the distinct characteristics of black phosphorus quantum dots (BPQDs), herein, a versatile nanoprobe (H-MnO₂/DOX/BPQDs) is constructed for dual-modality cancer imaging and synergistic chemo-phototherapy. The hollow mesoporous MnO₂ (H-MnO₂) nanoparticles are sequentially decorated with a cationic polymer poly (allylamine hydrochloride) (PAH) and an anionic polymer poly (acrylic acid) (PAA). The obtained H-MnO₂-PAH-PAA is covalently grafted with BPQDs-PEG-NH₂ via a carbodiimide cross-linking reaction and then loaded with anti-cancer drug DOX to form final nanoprobe H-MnO₂/DOX/BPQDs. Under the tumor microenvironment, H-MnO₂/DOX/BPQDs is degraded to release encapsulated functional molecules DOX and BPQDs. DOX acts as the chemotherapy and fluorescence imaging agent, and BPQDs endows the nanoprobe with photodynamic therapy (PDT) and photothermal therapy (PTT) abilities under dual laser irradiation of 630 and 808 nm. H-MnO₂ offers contrasts for magnetic resonance imaging (MRI) and facilitates conversion of endogenous H₂O₂ to oxygen, thereby relieving tumor hypoxia and enhancing PDT efficacy. All in vitro and in vivo results demonstrate that the designed nanoprobe displays dual-modality MRI/FL imaging and synergistic chemotherapy/PDT/PTT, which ultimately enhances the accuracy of cancer diagnosis and therapeutic performance.     

我国沿海生态植被消波研究进展

为对我国沿海生态植被消波研究进行综述,首先以消波植被作为切入点,分析了植被的刚度、分布以及非均匀性对消波效果的影响;进而,以水动力输入条件为切入点,综述了不同波浪情况下生态植被消波研究方法的异同;最后,将传统防波堤与生态植被消波进行对比,探讨二者在海岸条件、消波机制、生态效益、后期维护等方面的差异。认为消波植被刚度、分布、非均匀性等问题可以作为后续研究的方向,同时可尝试将防波堤消波与生态植被消波相结合,兼顾防灾减灾和生态保护的功能。     

协同通信系统中基于系统容量的功率分配研究

对放大转发协同中继系统进行了容量分析,综合考虑源节点与中继节点以及各中继节点之间不同功率分配对系统容量的影响．基于中继信道强度的瓶颈效应,提出了一种使系统容量最大的优化功率分配方案,并得到了源节点功率Ps、中继节点总功率Pr、各个中继节点功率Pi的闭合表达式．仿真结果表明,相比传统的等功率分配,该方案使系统容量显著提高,特别是当信道信噪比较低时,提高比例超过90％;又因其复杂度低,该算法有很强的实用性．     

高转矩密度磁力齿轮的拓扑结构设计与性能比较

永磁行星齿轮和同轴永磁齿轮是两类具有不同拓扑结构和运行原理的磁力齿轮,采用定量设计比较法设计了具有相同有效体积和永磁体用量的上述两类磁齿轮,并通过有限元分析法对二者的转矩传递性能进行比较研究。研究结果表明,永磁行星齿轮较同轴永磁齿轮有更高的转矩密度和更低的转矩脉动。此外,由于永磁行星齿轮具有更加灵活的运行模式,并且能实现功率分流,使其在混合动力汽车领域有很好的应用前景。加工了一台永磁行星齿轮样机,并搭建试验平台进行了相关的试验,结果表明了该拓扑结构的有效性。     

基于混合静止能量的虚拟转动惯量控制技术

首先在频率动态变化过程中,建立蓄电池的电池储能、超级电容器的电容储能与同步发电机的机械动能间的能量转换关系,阐述源于2种静止能量的混合储能系统的虚拟转动惯量的定义。其次,根据蓄电池和超级电容器的充放电特性,利用2种储能单元间的功率协同调节,提出含电池储能与电容储能的虚拟转动惯量的控制策略。该控制策略通过监测系统频率波动,根据2类储能元件的功率调节特性及荷电状态,协同调用2种静止能量,以模拟同步发电机组的惯性响应。最后,通过搭建含混合储能的光伏微电网仿真系统,验证了所提控制策略能够充分利用混合储能设备中存储的静止能量快速虚拟出惯性响应,显著改善系统频率的稳定性。     

不同强化类型的好氧颗粒污泥结构特性

把聚合氯化铝（PAC）、微生物絮凝剂（Microbial flocculant,MBF）、颗粒活性炭（GAC）投加到反应器中可以加快好氧颗粒污泥形成和提升其结构稳定性。扫描电镜（SEM）结果显示,对照组和MBF组好氧颗粒污泥外部呈网状疏松结构,而PAC组和GAC组颗粒表面结构致密。胞外聚合物（EPS）荧光原位染色表明,EPS主要结构组分中的蛋白和β多糖在对照组和MBF组中均为均匀分布,这两组颗粒形成机理符合“EPS假说”;PAC强化型颗粒形成了“蛋白外壳β多糖内核双层构造”,GAC组的颗粒内部有高密度蛋白包裹着颗粒活性炭,这两组颗粒污泥的形成机理更符合“晶核假说”。结构完整性实验表明：PAC、MBF、GAC都可以显著提升好氧颗粒污泥抗水力剪切能力;抗水解酶强弱顺序依次为PAC组 > GAC组 > MBF组 > 对照组。     

Engineering the Exciton Dissociation in Quantum‐Confined 2D CsPbBr3 Nanosheet Films

Recent years have witnessed a rapid development of all‐inorganic halide perovskite in optoelectronic devices. Ultrathin 2D CsPbBr₃ nanosheets (NSs) with large lateral dimensions have demonstrated exceptional photophysical properties because of their analogous exciton electronic structure to quantum wells. Despite the incredible progress on device performance, the photophysics and carrier transportation parameters of quantum‐confined CsPbBr₃ NSs are lacking, and the fundamental understanding of the exciton dissociation mechanism is far less developed. Here, a ligands rearrangement mechanism is proposed to explain why annealed NS films have an increased charge transfer rate and a decreased exciton binding energy and lifetime, prompting tunneling as a dominant way of exciton dissociation to separate photogenerated excitons between neighboring NSs. This facile but efficient method provides a new insight to manipulate perovskite nanocrystals coupling. Moreover, ultrathin 2D CsPbBr₃ NS film is demonstrated to have a enhanced absorption cross section and high carrier mobility of 77.9 cm² V^?1 s^?1, contributing to its high responsivity of 0.53 A W^?1. The photodetector has a long‐term stability up to three months, which are responsible for reliable perovskite‐based device performance.     

关于国际室内建筑师/设计师联盟2003年年会

2003年12月3～6日在印度孟买召开了国际室内建筑师/设计师联盟internationalfederationofin-teriorArchitects/interiorDesigners简称IFI第21届年会。中国建筑学会室内设计分会组织了由学会领导及各地设计师等17人组成的代表团参加这次国际大会,其中张世礼、劳智权、来增祥作为