Results 51 to 60 of about 3,685 (215)
智能科学与技术学报, 2019 空间智能软体机械臂因其结构轻巧、灵活可变、可折叠收缩等特性，在航天器在轨服务任务中，将具有广阔的应用前景。首先提出了一种全向驱动的模块化软体机械臂设计方案，利用刚柔耦合动力学理论建立了气控驱动的软体机械臂动力学模型，基于深度回归卷积神经网络理论建立了空间非合作目标检测与识别算法，为空间软体机械臂智能控制奠定了技术基础。进一步地，设计并研制了软体机械臂地面原理样机及其试验系统，通过地面试验，对软体机械臂的自主运动控制和识别算法进行了初步验证。
张翔 +5 more
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Integrative Conservation, Volume 5, Issue 1, Page 150-163, March 2026.Our research allows us to understand the predictors of extinction risk in traditional Chinese medicinal (TCM) plant species with known threat status, and incorporate this knowledge to predict other TCM plants with unknown conservation status in China so as to improve the overall effectiveness of conservation strategies.
Yuhan Zheng +4 more
wiley +1 more source
Gaoya dianqi, 2015 为了简化高压真空断路器操动机构的结构并提高其工作可靠性,笔者对不同转子结构的真空断路器电机操动机构的动态特性进行了研究。建立了126 kV真空断路器操动机构的动态仿真模型,推导了驱动电机主轴侧的等效转动惯量、动态反力以及动触头行程与驱动电机转角的关系。依据上述分析并综合考虑绕组端部效应对电机启动过程的影响,采用场—路—运动耦合法对驱动电机在断路器分、合闸操作过程中的瞬态磁场和动态机械特性参数进行了仿真计算。结合仿真结果制成了永磁驱动电机样机,进行了操动机构与断路器联机试验试验。试验结果表明 ...
林莘, 马希志, 李昊旻
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Effects of climate change on spatial evolution of apple production in China [PDF]
[Objective] As the world's largest producer and consumer of apples, China's apple industry has undergone significant spatial pattern changes in recent years under the backdrop of climate change, mainly characterized by the transfer and concentration of ...
HU Weitong +4 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT As a promising alternative to sluggish Li2CO3‐based Li‐CO2 electrochemistry, Li2C2O4 offers a favorable 2e− discharge pathway, yet its selective formation and reversible decomposition remain debated. Herein, we propose a nonmetal‐metal synergistic catalyst—B‐Ti coregulated layered transition metal boride Ti18B18O9/graphene (B‐Ti/TiBOG)—to ...
Qiong Peng +8 more
wiley +1 more source
Shiyou jixie, 2012 大型石油钻机常配置2台电动机同时驱动同一个控制对象，这就要求2台电动机同步运转，否则会导致齿轮箱的机械损坏。采用西门子6SE70变频器主从控制技术，以S7-300PLC为控制中心，通过Profibus总线与调速装置进行通讯，以SIMOLINK板来传输主机的转矩给从机，可以实现2台电动机同步运转，保证传动系统的稳定性。介绍了利用Profibus总线和SIMOLINK相结合实现钻机主从控制的原理、方法和控制过程，并说明了控制操作中应该注意的几个问题。
李崇博, 杨蕊, 李鹏飞, 钟志伟
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, 2011 日趋饱和的市场和知识与创新的离散化,使生产者驱动价值链的领导者对核心竞争力的垄断性减弱;而市场重要性的提高,则使购买者驱动价值链的领导者的地位不断提升。全球价值链的驱动力呈现出由生产者驱动向购买者驱动转变的趋势。价值链驱动力的动态变化,为我们构建中国的全球价值链提供了可供选择的多种途径。同时,面对购买者驱动作用的提升,我们应充分利用巨大的国内市场优势,培育本土的大购买商 ...
蒙丹
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The Spatio-temporal Evolution of NDVI in the Three Gorges Reservoir Area Driven by the Synergistic Effect of two Factors over the Past 21 Years [PDF]
[Objective] To clarify the spatio-temporal characteristics of vegetation evolution in the Three Gorges Reservoir Area, and to quantitatively analyze the relationships between vegetation and key determinants, including climate, terrain, and human ...
LI Cheng +5 more
core +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Proton exchange membrane fuel cells (PEMFCs) require advanced bipolar plate coatings to enhance efficiency, durability, and commercialization potential. This review presents a systematic framework for evaluating and designing bipolar plate coatings, integrating material selection, performance metrics, deposition techniques, and future ...
Shijie Li +12 more
wiley +1 more source
Gaoya dianqi, 2020 高压断路器的稳定工作是电力系统正常运行的关键,为了优化其分合闸控制的性能,研究了一种由永磁同步电机（PMSM）驱动的高压真空断路器操动机构及由DSP作为主控模块的伺服控制系统。构建了一台由126 kV真空断路器、永磁同步电机、DSP及外围控制系统组成的实验装置进行实验。针对与电机转矩惯量比相关的定子尺寸与永磁体厚度进行了优化分析,并设计了与真空断路器性能匹配的控制系统程序流程。通过采用最大转矩电流比控制策略控制电机,可以实现真空断路器按预设的参考曲线进行分合闸操作。实验结果表明 ...
何保营 +7 more
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