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关键词： 无线电通信  

ISBN: (纸本)9787111698746

摘要： 随着铁路建设的快速发展, 运营里程的不断增加, 铁路系统的安全可靠性影响着整个社会经济发展。为了应对新时期铁路运行环境与基础设施监测面临的需求与挑战, 进一步提升铁路行车安全保障能力, 铁路基础设施及运行环境监测系统作为保障铁路系统安全运营最有效的方案之一应运而生。本书以铁路基础设施及运行环境监测需求为基础, 提出基于边云机制的铁路监测系统架构, 并在此基础上建立WSN子网协议优化、WSN骨干网协议优化、WSN时延优化和WSN带宽优化模型与方法。

摘要： What factors drive diversification in species groups with wide distributions and high morphological disparity? Pavon-Vazquez et al. used an extensive morphological and phylogenetic dataset to investigate patterns of diversification in monitor lizards (Varanidae). They found contrasting drivers of speciation and morphological diversity across clades and regions, highlighting the importance of considering clade-specific biogeographic histories in broadly distributed taxa.

关键词： Erbium   Stochastic processes   Energy storage   Optimization   Storage management   Internet   Routing   Compressive sensing   energy Internet   energy router   energy storage   stochastic optimization  

摘要： The functionality of energy routing among microgrids is becoming increasingly important with the progress of deploying smart power systems all over the world. For higher energy routing performance and better renewable energy integration, a new type of electrical device, called energy router (ER), is being developed as a part of the infrastructure of the future energy Internet (EI). Generally, the long-term operation of ERs requires an effective energy management scheme for the energy storage inside these devices. In this article, considering the randomness of power generation by renewable energy sources and the stochastic power usage of loads in EI scenario, the compressive sensing is adopted for the solution to the nonlinear energy storage management problem which is essential for the design of ERs. The compressive sensing method used in this article is proven to be more efficient than the conventional Monte-Carlo methods and polynomial chaos expansion method, and the performance of the proposed method is evaluated with numerical examples.

关键词： Biomechanics   Cell wall   Leaf morphogenesis   Metabolism   Mechanical feedback   Proprioception  

摘要： The above ground organs in plants display a rich diversity, yet they grow to characteristic sizes and shapes. Organ morphogenesis progresses through a sequence of key events, which are robustly executed spatiotemporally as an emerging property of intrinsic molecular networks while adapting to various environmental cues. This Review focuses on the multiscale control of leaf morphogenesis. Beyond the list of known genetic determinants underlying leaf growth and shape, we focus instead on the emerging novel mechanisms of metabolic and biomechanical regulations that coordinate plant cell growth non-cell-autonomously. This reveals how metabolism and mechanics are not solely passive outcomes of genetic regulation but play instructive roles in leaf morphogenesis. Such an integrative view also extends to fluctuating environmental cues and evolutionary adaptation. This synthesis calls for a more balanced view on morphogenesis, where shapes are considered from the standpoints of geometry, genetics, energy and mechanics, and as emerging properties of the cellular expression of these different properties.

标准号: DB34/T 4103.2-2022

标准号: DB34/T 4103.1-2022

关键词： 工程施工项目   物资设备   集约化管理   精细化管理  

摘要： 未能做好施工项目物资设备管理,不仅将导致施工成本超预算,也将给施工进度、质量等各方面带来不良影响.结合工程施工项目实例,对物资设备管理要点展开了分析,通过引进集约化、精细化等管理手段,加强对物资采购、供应、出入库等各环节管理,并做好机械设备选型配置和使用维护管理,全方位提高项目物资设备管理水平,为类似工程管理工作的开展提供参考.

标准号: GB/T 23021-2022

摘要： 本文件给出了信息化和工业化融合(以下简称“两化融合")环境下生产设备的组成形态和生命周期、以及生产设备管理的基本原则，提出了两化融合环境下生产设备的5个管理域和4个管理能力成熟度等级，规定了生产设备管理能力成熟度等级要求。本文件适用于制造企业对两化融合环境下的生产设备管理能力成熟度进行评价，并为开展生产设备研发制造和运维服务的技术服务商、科研院所等提供依据和参考。