Results 21 to 30 of about 13,666 (211)
Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, Volume 250, Issue 2, Page 1231-1247, April 2026.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
wiley +1 more source
Research and Application on Key Technologies of LED Lighting for Large Henhouse [PDF]
, 2016 摘要 人工照明技术可促进肉鸡生长以提高产量，使鸡舍照明技术在近年来发展迅速。具有环保、节能、高效和寿命长等优点的LED照明技术广泛应用于各个领域。本文基于某企业鸡舍照明设备改造项目，结合LED照明技术，为企业设计了一套稳定可靠的大型鸡舍LED照明系统。 本文介绍了鸡舍LED照明系统总体方案，阐述了系统布局及要求，利用距高比概念确定鸡舍光照分布和单盏灯光通量，确定照度控制方式，确立系统控制方法，确定各分区供电的开关电源设计标准。在总体方案基础上进行控制系统设计，为解决远距离信息传输设计通信信道 ...
王新峰
core
智能城市应用, 2023 随着全球能源问题的日益突出和环境保护意识的增强，节能已经成为建筑设计和运行管理的重要方面。民用智能建筑作为一种集信息技术、自动化控制和能源管理于一体的新型建筑形式，其电气设计对于实现节能目标具有重要意义。在智能建筑的电气系统中，变压器作为电能传输和配电的关键设备，其能源利用效率直接关系到整个建筑的能源消耗和运行成本。因此，对于变压器的节能技术研究显得尤为重要。文章旨在探讨民用智能建筑电气设计中的变压器节能技术，通过合理选择节能型设备、优化运行方式和控制功率因数等措施，提高变压器的能源利用效率 ...
智超 韦
semanticscholar +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT In conventional piezoceramics, the coordinated change between the dielectric constant (εr) and the piezoelectric charge constant (d33) usually limits the piezoelectric voltage constant g33 (g33 = d33/εr), a critical figure of merit for piezoelectric sensors.
Xiaoying Feng +7 more
wiley +1 more source
AC-AC Converter With High Frequency Link [PDF]
, 2015 电力电子变换技术在过去六十年里已经取得较大发展，人们在AC/DC、DC/DC、DC/AC等领域内的中、小功率变换器研究已经取得了显著成就。然而，对AC/AC变换器研究仅局限于可控硅变换器、矩阵变换器和交流斩波器等交流电网与负载无电气隔离领域。目前国内外对于AC/AC变换技术的研究仍处于初级阶段，寻找一种结构简洁、控制模式方便的主拓扑具有很重要应用意义。 本文通过了解各种典型和新兴的交流变换器主拓扑结构及其性能特点，对高频连接型全桥桥式变换器的电路拓扑、控制原理等进行了深入研究，设计出一款可运行恒压 ...
张少煌
core
Application and Prospect of Flexible Transmission and Distribution Technology in Internet Data Center [PDF]
, 2023 [Introduction] As an important thrust of China's "new infrastructure", internet data centers have ushered in opportunities for vigorous development and become new areas of energy use, putting forward higher requirements for the power supply level and ...
Deyang CHEN +7 more
core +1 more source
水电科技电力变压器性能的稳定与可靠直接关系到电网运行的安全性和可靠性。电气高压试验作为评估变压器绝缘性能的关键手段，有利于确保设备运行安全。文章通过介绍电气高压试验中的主要风险因素，详细阐述了电力变压器高压试验的试验条件。在此基础上，重点讨论变压器高压试验的要点，包括准备工作、试验安全预防、高压试验数据库完善、试验结果分析、变压器试验防护系统构建，以有效确保电力变压器高压试验的准确性和安全性，保障电力设备的稳定运行。
斌 褚
semanticscholar +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
wiley +1 more source
Design of constant voltage and constant current switching power supply [PDF]
, 2015 随着电子科技日新月异的发展，每家每户使用的电器设备越来越多，而电器设备往往需要合适的电源来驱动。特别是带有锂电池的离线设备，比如吸尘器、电动车、手机、数码相机等需要高精度的恒压恒流的充电器，使之合理的充电曲线保证锂电池的充电安全和寿命。 开关电源因其小体积、低功耗、高可靠性、高效率等诸多优点受到广泛的关注。开关电源是通过PWM信号控制MOS器件开和关，使输入连续的直流电变成间断的脉冲，再通过电容电感储能滤波，将间断的脉冲滤成连续的直流电。从而可知，只要调节MOS器件的开 ...
林明威
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo +6 more
wiley +1 more source