Results 11 to 20 of about 18,310 (195)
Study on the Optical-thermal Response of Nasopharyngeal Tissue [PDF]
, 2004 【中文文摘】利用生物传热理论模型Pennes方程对Ar+激光辐照下生物组织的温度分布进行模拟研究;实验测定了离体猪鼻咽组织在Ar+激光(λ=488.0nm和514.5nm)辐照下不同位置的温度分布,重点研究了辐照功率密度和波长对组织中温度分布的影响。理论和实验结果表明:组织中的温度分布与组织不同深部位置、激光波长以及激光辐照功率密度有关;实验获得波长488nm和514.5nm的Ar+激光分别辐照鼻咽组织时安全光剂量分别为1.85W/cm2和1.72W/cm2。 【英文文摘】The temperature
李晖, 沈桂平, 谢树森, 陈珍黎
core +2 more sources
Dianci bileiqi, 2022 近年复合绝缘子酥朽故障引起的温升现象逐步增多，是复合绝缘子应用面临的主要故障类型。然而除芯棒酥朽缺陷外，引起复合绝缘子温升的成因还包括绝缘子表面积污放电、护套吸水受潮、阳光不均匀直射等原因。本研究收集不同温升类型复合绝缘子的红外图谱，并统计其温升的部位分布特点、温升数值等红外特征。其次，基于有限元分析和检测试验，分析各温升现象的成因和机理。最后基于现场统计分析的红外图谱特征、检测试验和仿真分析，总结温升缺陷复合绝缘子温升特点及其识别规则，为现场复合绝缘子红外测温诊断提供了理论指导。
王晓杰 +4 more
doaj
Efficient Measurement of Thermal Coupling Effects for Multi-chip Light-emitting Diodes [PDF]
, 2016 随着高亮度的白光LED在室内和室外领域的广泛应用，对大功率LED的要求越来越高，由此多芯片LED应运而生，同时多芯片LED也是大功率LED芯片的发展趋势之一。对于多芯片LED来讲，芯片之间的热耦合是一个重要的问题，因为芯片的温升不仅只是自身产生的热量引起的，还有一部分是由于其他芯片对其的热耦合产生的。本文主要研究的是多芯片LEDLED模块的热耦合问题，主要从理论上推导了多芯片LED模块的热耦合矩阵，并通过热仿真和实验对多芯片LED模块的热耦合矩阵的合理性进行了验证。具体做了以下几个方面的工作： 1 ...
卢红丽
core
Rare Metals, EarlyView.ABSTRACT TiFe‐based hydrogen storage alloys have garnered significant attention because of their cost‐effectiveness, high hydrogen capacity, and favorable hydrogen absorption/desorption characteristics. However, practical application was limited by activation challenges and sensitivity to environmental poisoning.
Yuehai Li +8 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Fluxgate sensors with Co‐rich amorphous microwires, widely used for their low noise in magnetic field measurements, encounter significant challenges in high‐temperature environments such as well drilling and geological exploration. Prolonged thermal aging degrades the performance of Co‐rich amorphous microwires, resulting in increased noise ...
Lining Pan +10 more
wiley +1 more source
Gaoya dianqi, 2023 高频融冰热效率高，具有实现输电线路在线融冰的发展前景，揭示融冰过程中温升与环境等因素的变化规律对于实际应用具有重要意义。文中建立了覆冰线路高频融冰模型，重点考虑了冰层下移时环境温度、风速和覆冰厚度等因素对冰层内表面温升的影响。研究结果表明：在融冰过程中，对流换热强度影响冰层内表面温升速率，风速降低、环境温度升高，对流换热强度减弱，温升速率均增大，但温升速率随覆冰厚度增大而减小。因而选择合适的环境条件和覆冰厚度时机进行融冰能有效提高温升速率和缩短融冰时间。
曾薇, 周羽生, 黄欣超, 周文晴
doaj
Rare Metals, EarlyView.ABSTRACT Polycrystalline SnSe thin film materials have gained increasing attention as a promising solution for fabricating microscale, flexible, self‐powered electronic components in the field of thermoelectric (TE) materials and devices. However, it is still a great challenge to simultaneously achieve preferred crystal orientation and optimize carrier
Wenxia Li +10 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 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
Highly Anisotropic TbCo11Ti: Phase Evolution, Microstructure and Magnetic Properties
Rare Metals, EarlyView.ABSTRACT Among the 1:12‐type compounds, TbCo11Ti stands out due to its high Curie temperature and pronounced magnetocrystalline anisotropy. However, its magnetic behavior at room temperature and its phase evolution process have not been clearly established.
Wei Chen +11 more
wiley +1 more source