Results 21 to 30 of about 252,774 (130)
Gaoya dianqi, 2022 为兼顾操作冲击电压、雷电冲击电压作用下对CVT的补偿效果,针对CVT的操作、雷电冲击响应所含的频率分量相差较大,本文提出了一种基于分类器和双路BP神经网络还原CVT一次侧波形的方法。通过设置频率分点计算高于频率分点的小波能量曲线以区分冲击电压类型,进而将冲击电压响应输入对应的双路BP神经网络神经元。通过多组雷电、操作冲击电压波形对神经网络进行训练,并验证了该方法能够兼顾CVT的非线性,模型具有波形适应性。现场应用表明,该方法可以用来对CVT进行暂态电压传递特性补偿 ...
谢施君 +5 more
doaj
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT Household food expenditure continues to be a key factor in ensuring the realization of the Human Right to Adequate Food. Particularly in Brazil, access to food can be limited by economic constraints in vulnerable families, especially among farming families, who have been more vulnerable to food insecurity in recent years in the country.
Lucas de Almeida Moura +3 more
wiley +1 more source
Ultrasonic Vibration Assisted Laser Processing: A Hybrid Paradigm for Extreme Surface Enhancement
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Traditional laser processing techniques offer many advantages, but they often encounter limitations such as heat‐affected zones, recast layers, residual tensile stresses, and poor surface finish. The integration of ultrasonic vibration (UV) presents a promising hybrid approach to overcome these challenges by introducing beneficial effects like
Aziz Ul Hassan Mohsan +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT In laser‐directed energy deposition (LDED) of TiC/Ti6Al4V composites, a low content of micron‐sized TiC provides a good strengthening effect on hardness and strength, but the improvement in plasticity remains a challenge. By introducing synchronous ultrasonic impact treatment (UIT) into the LDED process, an ultrasonic‐assisted LDED (UA‐LDED ...
Yuzhou Zeng +9 more
wiley +1 more source
激波管可以在实验室环境下模拟爆炸产生冲击波，具有参数易于控制和测量手段准确多样等优势，在爆炸冲击效应的研究中被广泛应用。但与真实爆炸相比，尤其是近场爆炸，激波管产生的冲击波存在正压作用时间难以缩短、超压峰值难以提升的困难。通过对激波管运行理论和数值模拟分析发现：缩短正压作用时间的关键是让反射稀疏波尽快追上入射激波；提升超压峰值的关键是提高驱动气体的驱动能力。为此，设计了一种驱动段为锥形截面的激波管，使得反射稀疏波更快地追上入射激波，从而有效减小激波管设备长度并缩短正压作用时间；同时，采用正向爆轰驱动技术，
李进平 +4 more
core +5 more sources
Rhetorical Diffusion and Policy Latency: Tracing AIPAC Influence in US–Iran Relations (2010–2026)
Policy Studies Journal, Volume 54, Issue 3, August 2026.ABSTRACT How do domestic interest groups shape the transition from diplomatic agreements to kinetic warfare? This research article addresses the methodological stagnation in foreign policy analysis by introducing a computational text‐as‐data pipeline to systematically quantify lobbying influence.
Bülent Aras
wiley +1 more source
Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019 目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The engineering application of traditional nano‐bainite steel, also known as low‐temperature bainite steel, has been restricted due to its relatively low toughness and the prolonged isothermal transformation time during manufacturing processes.
Jin‐Zhou Zhang +7 more
wiley +1 more source
, 1982 用Split-Hopkinson压力杆方法研究岩石的动态特性时,发现应力波通过破裂岩石试件产生的衰减和岩石动态强度的降低。本文考虑到修正的必要性,根据实验数据给出了一种分析和计算岩石动态强度的新方法,文中也给出了灰色砂岩和石灰岩的动态强度和动态应力——应变关系 ...
章根德
core +2 more sources