Results 21 to 30 of about 749,626 (175)
Dianci bileiqi, 2023 针对雷电电磁波对具有金属管保护的架空同轴线造成传输信号干扰、设备损坏等问题，通过对同轴线耦合理论的分析，利用理论与试验相结合的方法，采用大型雷电冲击发生器模拟雷电流进行冲击试验，得到以下结论：随着冲击电流的增大，线缆上的耦合电压也越大，金属管内的同轴线耦合的电压总比管外的同轴线耦合电压更小，管径越大耦合电压更小，当管径达到一定尺寸时，可以将管内的同轴线耦合电压降低在1 V以下，有效保护线缆终端的电子设备不受到过电压而有损坏；由频谱图可知，耦合的最大振幅均集中在10 kHz ...
李祥超 +5 more
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Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Dielectric polymers commonly suffer from severe performance degradation above 150°C, hindering advanced power systems. Herein, we demonstrate a polyetherimide (PEI) nanocomposite that overcomes this by mimicking the gradient architecture of nacre and bamboo, incorporating a continuous vertical gradient of fluorinated boron nitride nanosheets ...
Jian Wang +8 more
wiley +1 more source
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Catalytic NH3 decomposition has garnered substantial attention for hydrogen transformation and storage. Ni‐based catalysts continue to suffer from limited thermal stability and suboptimal low‐temperature activity, largely attributed to an incomplete understanding of the structure‐activity relationships and reaction mechanisms governing their ...
Tao Wen +8 more
wiley +1 more source
Dianci bileiqi, 2023 针对同轴电缆耦合强电磁脉冲产生的感应过电压对同轴电缆终端设备造成暂时或永久性损害的问题，用理论和试验相结合的方法，采用有界波模拟器模拟2.3/23 ns电场波形，选用SYN-75-3-1-64网无氧铜008M型号的监控线作为同轴电缆耦合对象进行试验，得出以下结论：1)当场间电场强度作为自变量时，随着电场强度的增大同轴电缆耦合到的电压也会变大；2)电场强度一定时，同轴电缆在电场中耦合到的电压会随着耦合长度的增加而变大；3)同轴电缆耦合到的电压还与摆放角度相关，同轴电缆与电场方向的夹角越大 ...
李祥超, 王贤超, 欧阳文, 王兵
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Functional Ecology, Volume 40, Issue 6, Page 1921-1932, June 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Most terrestrial plant species form symbioses with arbuscular mycorrhizal fungi (AMF). However, the below‐ground carbon (C) allocation of plants and the nutritional and growth benefits provided by AMF within this symbiosis vary greatly across species and environments ...
Hengjun Zhao +3 more
wiley +1 more source
四川大学学报. 自然科学版, 2010 本文采用数值模拟的方法研究了参数不均匀性,耦合和噪音的协作效应对单向耦合布鲁塞尔体系相干共振的影响作用,其中噪音仅加于无耦合的控制体系.研究结果发现:具有相同控制参数的耦合体系,在耦合和噪音协作效应的影响下,存在最佳的耦合强度使控制体系的相干共振在受控制体系中得到增强.对于不同控制参数的耦合体系,参数不均匀性,耦合和噪音的协作效应对控制体系相干共振的增强或维持起决定性的作用.另外,当耦合强度和噪音达到临界值时,参数不均匀性的作用消失,此时控制体系和受控制体系之间出现了动力学行为的同步现象 ...
施建成
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The large‐scale application of titanium is limited by its high production costs, as well as its low utilization and recycling rates. Therefore, efficient recovery of titanium scrap offers a viable pathway to reduce its cost. Molten‐salt electrolysis offers a promising route for upcycling titanium scrap, but the conventional method, which ...
Haoyu Fang +4 more
wiley +1 more source
Guangtongxin yanjiu, 2014 当前以电子作为信息载体的微电子技术遭遇到发展瓶颈。光传输具有带宽大、速率高的特点,将光子载体与电子载体相结合是未来信息传输发展的必然趋势。波导与光纤的高效耦合是实现光电子集成的关键。文章介绍了国内外几种典型耦合器的最新进展,包括楔形耦合器、GRIN（渐变折射率）透镜耦合器和垂直光栅耦合器,并对它们的性能指标、优缺点进行了比较分析,对进一步提高耦合效率的可行性进行了展望。结果表明,垂直光栅耦合器具有耦合效率高、带宽大、工艺成熟、工艺容差大和耦合步骤简单的优势,在光通信与集成光电子学领域有着广阔的应用前景。
周飞亚, 张敏明, 何岩, 刘德明
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Si Alloying Enables High Performance in Ce‐Substituted Hot‐Deformed Nd–Fe–B Magnets
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT High levels of Ce substitution typically degrade the magnetic performance of hot‐deformed Nd–Fe–B magnets, posing challenges for developing resource‐efficient permanent magnets. Here, we demonstrate that minor Si alloying in (Nd0.6Ce0.4)‐Fe‐B hot‐deformed magnets effectively compensates for this degradation and enables enhanced magnetic ...
Feifei Li +6 more
wiley +1 more source
Guangtongxin yanjiu, 2014 为了研究混合导光双芯PCF（光子晶体光纤）的色散特性和耦合特性,设计了一种基于全内反射和光子带隙效应两种导光机制的混合导光双芯PCF。以耦合模式理论为基础,利用有限元法和平面波展开法分析其有效折射率、耦合长度和色散特性,并对定向耦合器和光波长选择器进行了研究。仿真结果表明,该混合导光双芯PCF具有大负色散特性和良好的耦合特性。研究成果对双芯PCF的耦合特性、传感特性的理论研究及其相关器件的实际应用具有重要的参考价值。
肖颖, 董传培
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