Results 51 to 60 of about 6,151 (176)

The Led Ceiling Light Of IR Control Dimming CCT And Lighting [PDF]

open access: yes, 2015
随着科技水平的提高和能源问题的不断加剧,节能环保成为了新时代各国发展的一个主题。LED作为一种新型节能高效的环保光源,在越来越多的领域展现了其优异的应用特性,受到了各国政府的重视,特别是LED用来做照明灯具,其投入的力度越来越大,LED的发光效率的飞速提高昭示着第四代照明光源正在不断发展。 本文创新点是基于传统的红外控制信号通过软件算法进行调光调色,主要特点:第一在调光时保持色温不变,在调色时保持亮度恒定,而且在调节时不管是色温还是亮度会渐变到当前档,不会出现突变,给人眼一个适应的过程 ...
曾梅真
core  

Coral‐Like Yolk–Shell‐Structured CoNi@Void@C Microspheres for Enhanced Microwave Absorption, Photothermal, Anti‐Corrosion, and Radiation Shielding Properties

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Considering the multiple challenges faced by stealth coatings in complex service environments, the development of multifunctional integrated microwave absorbing materials (MAMs) that combine efficient electromagnetic (EM) attenuation with environmental tolerance has become an urgent need. In this work, coral‐like CoNi@Void@C microparticle (MP)
Jiale Wu   +8 more
wiley   +1 more source

Design of low-power LNA for intelligent water meters(适于智能水表的低功耗低噪声放大器设计)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2013
采用交叉源耦合差分结构以及有源器件并联技术,提出了 一种适合智能水表芯片前端具有对称结构的低功耗低噪声放大器.基于标准0.35 µm CMOS工艺进行实现,PSPICE仿真测试结果表明,在2.5 V的典型电源电压和1 kHz的输入信号频率下,所提出的放大器等效输入噪声为9.1 nV • Hz-1/2,系统功耗为104 µW.具有低噪声和低功耗的特性,已达到智能水表芯片系统的工作需求.
PANLiang-liang(潘亮亮)   +1 more
doaj   +1 more source

Research and Design of Multi-Channel Temperature Control System for High Power LEDs Online Accelerated Aging [PDF]

open access: yes, 2016
半导体照明技术伴随时代的进步,应用愈发广泛,大功率LED照明领域更是逐步走向普及。但实际应用中,LED器件和封装的缺陷及工作时发热极大限制了其性能和实际寿命,可靠性问题日渐显露。为此LED寿命加速测试尤为重要,以实现寿命预测,失效机理分析,使得LED可靠性提升。常用的高温老化测试传统上使用高温试验箱,此方法存在诸多缺点:参数检测不连续、温升慢、体积大、功耗高。本文针对性地研制了一套轻便的LED在线寿命加速多路温控系统(以下简称温控系统)。主要工作内容与研究成果如下: 1.研制了温控系统的硬件部分 ...
周骁炀
core  

Template Engineering of Magnetic Nanoparticles Decorated on Porous Carbon for High‐Performance Multiband Electromagnetic Wave Absorption

open access: yesRare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Although magnetic carbon materials possess significant potential in the field of electromagnetic wave absorption (EWA) due to the synergistic effect of multiple attenuation mechanisms, the currently reported magnetic carbon EWA materials face some challenges, such as high cost, low yield, and easy agglomeration of the magnetic component ...
Bo Jiang   +9 more
wiley   +1 more source

Analysis and Design of Network Public Opinion Monitoring System Based on Cloud Platform [PDF]

open access: yes, 2014
随着移动互联网技术的发展,网络传播也随之兴起,以往在传统新闻媒介上无法实现的个人表达自由的言论得到空前的发展,而这种言论往往具有突发性、非理性等特点,因此对网络舆情监测系统及相关技术进行研究设计具有很好的实际意义。 网络舆情监测需要对网络舆情进行采集、分析、提取并保存,以供查询、展示及预测等,数据抓取、数据解析、云存储是其中的三个关键技术。为了有效进行网络舆情监测,本文对以上三方面的关键技术展开研究,主要创新内容包括: 1.设计网络信息获取过程中的各种关键算法,包括:分布式bloom过滤器设计 ...
张永光
core  

Validation of the Parental Reflective Functioning Questionnaire in Finnish mothers and fathers of toddlers

open access: yesInfant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 5, Page 564-576, September 2025.
Abstract Parental reflective functioning (PRF) is important in guiding parenting behavior. It is traditionally measured with interviews that are relatively time‐consuming. A self‐report measure of PRF, the Parental Reflective Functioning Questionnaire (PRFQ), has been developed but has not yet been extensively validated across different sociocultural ...
Marjo Flykt   +4 more
wiley   +1 more source

Design and Implementation of Infotainment Hardware System by Vehicle Network [PDF]

open access: yes, 2016
近几年,中国汽车行业的繁荣带动着汽车电子行业飞速发展。车载信息娱乐系统也由原来单一的收音机、播放机功能发展到集成GPS,DVD、娱乐、通信等功能。一些主流的车载网络协议也渐渐的成为了国际上通用的标准。尽管目前国内自主品牌汽车上普遍都有安装车载信息娱乐系统和车载网络,但是其大部分的产品存在着功能少,用户体验差,可扩展性差,价格昂贵等缺点。本文针对国内外车载信息娱乐系统和车载网络存在的问题,通过高性能平台进行硬件系统设计,着重解决产品的功能集成度,可扩展性和用户体验等问题。 本文采用瑞萨电子的R ...
蔡华辉
core  

Research progress on traditional Chinese medicine animal models of post‐stroke depression and pathological insights

open access: yesAnimal Models and Experimental Medicine, Volume 8, Issue 8, Page 1387-1399, August 2025.
Post‐stroke depression (PSD) animal model of traditional Chinese medicine (TCM) combined with disease and syndrome often uses western medicine surgery (including: middle cerebral artery embolization to construct cerebral ischemia, or brain injection of collagenase to construct cerebral hemorrhage) combined with other methods (including: isolation ...
Jielin Wang   +4 more
wiley   +1 more source

金属氧化物阀片在氮气中的电气特性

open access: yesDianci bileiqi, 1992
分析了8片金属氧化物阀片在氮气中加速老化试验的电气特性。在115℃温度下,分别把有釉和无釉阀片先置放在空气中,然后再置放在氮气中,施加交流电压,其电气特性基于功率损耗随时间的变化。全部有釉阀片在氮气中的p—t变化不显著。而所有无釉阀片的p-t变化有较大差别,其中一部兮阀片的功耗增加较小,另一部分阀片功耗增加较大。并发现,当再次通入空气时功耗增加是可逆的。
郭胜茹
doaj  

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