Magnetically encoded 3D mesostructure with high-order shape morphing and high-frequency actuation

Inspired by origami/kirigami, three-dimensional (3D) mesostructures assembled via a mechanics-guided approach, with reversible and maneuverable shape-morphing capabilities, have attracted great interest with regard to a broad range of applications. Despite intensive studies, the development of morphable 3D mesostructures with high-order (multi-degree-of-freedom) deformation and untethered high-frequency actuation remains challenging. This work introduces a scheme for a magnetically encoded transferable 3D mesostructure, with polyethylene terephthalate (PET) film as the skeleton and discrete magnetic domains as actuation units, to address this challenge. The high-order deformation, including hierarchical, multidirectional and blending shape morphing, is realized by encoding 3D discrete magnetization profiles on the architecture through ultraviolet curing. Reconfigurable 3D mesostructures with a modest structural modulus (∼3 GPa) enable both high-frequency (∼55 Hz) and large-deformation (∼66.8%) actuation under an alternating magnetic field. Additionally, combined with the shape-retention and adhesion property of PET, these 3D mesostructures can be readily transferred and attached to many solid substrates. On this basis, diverse functional devices, including a switchable colour letter display, liquid mixer, sequential flashlight and biomimetic sliding robot, are demonstrated to offer new perspectives for robotics and microelectronics.     

推动广东省先进制造业和现代服务业融合发展

广东作为制造业大省,在先进制造业与现代服务深度融合发展方面先试先行,经过一系列行之有效的政策举措,两业融合发展取得一定进展,但在两业融合发展推进过程中也面临诸多困难和挑战.在国际贸易保护主义上升、全球市场萎缩、新冠疫情蔓延的外部环境下以及新一轮科技革命和产业变革的激烈角逐中,如何促进产业间配合、推动制造业和服务业融合发...     

Emerging hemostatic materials for non-compressible hemorrhage control

Non-compressible hemorrhage control is a big challenge in both civilian life and the battlefield, causing a majority of deaths among all traumatic injury mortalities. Unexpected non-compressible bleeding not only happens in pre-hospital situations but also leads to a high risk of death during surgical processes throughout in-hospital treatment. Hemostatic materials for pre-hospital treatment or surgical procedures for non-compressible hemorrhage control have drawn more and more attention in recent years and several commercialized products have been developed. However, these products have all shown non-negligible limitations and researchers are focusing on developing more effective hemostatic materials for non-compressible hemorrhage control. Different hemostatic strategies (physical, chemical and biological) have been proposed and different forms (sponges/foams, sealants/adhesives, microparticles/powders and platelet mimics) of hemostatic materials have been developed based on these strategies. A summary of the requirements, state-of-the-art studies and commercial products of non-compressible hemorrhage-control materials is provided in this review with particular attention on the advantages and limitations of their emerging forms, to give a clear understanding of the progress that has been made in this area and the promising directions for future generations.     

略论独立学院教师的定位及职业意识

随着我国高等教育大众化步伐的进一步加快,独立学院已从以规模求生存进入以质量求生存阶段。在这一转型过程中,除必要的硬件投入外,软环境管理显得尤为重要,其中教师队伍建设最为迫切,尤其是教师队伍对独立学院的认识问题。以如何做好一名独立学院教师为出发点,多视角讨论了独立学院的教师应该具备的职业意识。     

按收入比例偿还国家助学贷款的SWOT分析

澳大利亚高等教育贡献方案中确立的按收入比例还款计划由于保障了低收入者的利益、回收率高等特点而成为各国竞相效仿的对象。目前我国的国家助学贷款仍然主要采取定期定额还款的方式,按收入比例还款未被纳入正轨的贷款回收系统之中,使得按收入比例这种还款方式难以发挥自身的优势。     

基于检索统计系统的《新华文摘》引刊分析

本文通过《新华文摘》2000-2004年的检索统计数据库的建设,从中分析《新华文摘》转摘文献和引用期刊的特点,并利用文献计量方法分析其摘引期刊及核心作者的分布规律,指出评价分析期刊及学术文献应注重引文分析的方法。     

基于知识管理的IT项目风险研究

首先从知识管理角度分析IT项目的基本特征,在此基础上阐释知识管理环境下的IT项目风险：战略风险、知识资产风险、组织结构风险、信息技术风险、文化风险、创新激励风险,最后从目标、组织、信息系统、方法四个方面提出了基于知识管理的IT项目风险管理应对策略。     

环境影响评价与环境工程教学实践

文章提出开展对建设项目的环境影响评价,提高了教师的理论水平和解决实际环境污染问题的能力,丰富了环境工程课堂教学内容,促进了科研水平提高,带动了本科生污染源调查实习和毕业实习,拓展了毕业论文选题空间和研究内容。     

经济全球化条件下我国高校人才培养的目标与理念更新

经济全球化在导致全球经济竞争日益激烈的同时,必然使全球高等教育竞争进入白热化状态,而全球高等教育竞争的根本则是人才之间的竞争,人才之间的竞争最终决定着经济竞争的水平。本文认为,只有通过研究经济全球化条件下我国高等教育的应对策略,确定有效的人才培养目标,实现高等教育理念的全面更新,才是我国赢得经济全球化主动权的必然选择。     

偷换二维码的刑法定性

针对偷换二维码案件定性问题,学界主流观点认为构成三角诈骗,但三角诈骗说的缺陷在于,其弱化了商家与顾客的互动关系中商家的作用,忽视了商家对顾客支付行为的影响力。商家由于行为人的置换行为陷入认识错误,而顾客并不具有重要的认识错误。在二维码案件中,行为人的置换行为导致商家作出错误的指示行为,商家的指示行为支配顾客的扫码支付行为。置换行为属于实行行为,指示行为属于诈骗罪中的处分行为,而扫码支付行为并不因二维码的置换而产生影响,因而并不具有规范意义。