1 武汉科技大学材料与冶金学院，武汉 430081
2 武汉科技大学省部共建耐火材料与冶金国家重点实验室，武汉 430081
基于珠光砂孔隙多、体积密度低、热导率低的特点，为提高中间包永久性内衬浇注料的保温性能，本文研究了珠光砂添加量对矾土浇注料性能的影响。结果表明，随着珠光砂添加量的增加，烧制浇注料的体积密度减小，显气孔率增加，这与珠光砂本身特性有关，且随着珠光砂添加量的增加，浇注料的加水量增加，烧制时浇注料内部由于水分蒸发形成的原位气孔增加。同时，由于吸水后珠光砂强度降低且珠光砂与浇注料中基质的结合作用较弱，随着珠光砂添加量的增加，浇注料的抗折强度、常温抗压强度降低。综合分析，珠光砂最佳添加量为3%(质量分数)。在400~800 ℃时，添加3%珠光砂浇注料的导热系数比常规矾土浇注料低30%左右，证明添加珠光砂可显著提高矾土浇注料的保温性能。
珠光砂 添加量 矾土浇注料 物理性能 力学性能 导热系数 pearlescent sand additive amount bauxite castable physical property mechanical property thermal conductivity
王希群 1,2,3,4吕卓 1,2,3,4王远方舟 1,2,3,4付玉 1,3,4[ ... ]金振宇 1,3,4,*
1 中国科学院云南天文台，昆明 650011
2 中国科学院大学，北京 100049
3 云南省太阳物理与空间目标监测重点实验室，昆明 650011
4 云南省应用天文技术工程实验室，昆明 650011
针对地基大口径太阳望远镜的基于里奥滤光器的太阳窄带观测系统存在的频率漂移问题，提出了在线全视场频率漂移测量方法，并在NVST高分辨太阳光球观测实验系统进行了实测验证。实测表明，对全视场的频率漂移测量误差RMS小于0.1 pm。利用该方法测得的系统频率漂移可用于校正磁像仪的全视场频率漂移，提高太阳大气的磁场和速度场测量精度。
频率漂移 滤光器 太阳磁场测量 同步采集 在线测量 多光谱成像 Wavelength drift Filter Measurement of solar magnetic field Synchronous acquisition Online measurement Multispectral imaging
1 中国科学院云南天文台，云南 昆明 650216
2 中国科学院大学，北京 100049
3 云南师范大学 云南省光电信息技术重点实验室，云南 昆明 650216
4 云南北方驰宏光电有限公司，云南 昆明 650217
对于大口径地基开放式太阳望远镜，热光阑温升将导致其像质劣化。尤其是，热光阑通光孔紧挨成像光束，其与环境的温度差对像质影响很大。这是中国巨型太阳望远镜(Chinese Giant Solar Telescope, CGST)计划面临的诸多问题之一。解决热光阑温控问题的具体方法是设计整体冷却效率高且在关键位置得到进一步强化的热光阑结构，以达到温控均匀的目的。本文提出倒锥导流式热光阑设计方案，该方案有利于降低通光孔位置温度，使温度极高点离开通光孔。对流换热系数和光阑温度场仿真结果证明此方案明显优于目前常用的方法。倒锥导流式热光阑的极限温升为3 ℃，优于GREGO的极限温升（7 ℃）；实测温度场与仿真温度场进行对照，结果在误差范围内。结果证明导流式倒锥结构具有较好的温控效果。
热光阑 红外测温 CGST预研 导流式 射流冲击 heat-stop infrared temperature measurement CGST pre-research diversion type jet impact
Author Affiliations
Abstract
State Key Laboratory of Trauma, Burns and Combined Injury Institute of Combined Injury, Chongqing Engineering Research Center for Nanomedicine, College of Preventive Medicine Army Medical University, 30, Gaotanyan Street, Chongqing 400038, P. R. China
Phototherapy, mainly including photodynamic therapy (PDT) and photothermal therapy (PTT), is a noninvasive and effective approach for cancer treatment. Since integration of PDT and PTT for simultaneous synergistic PDT/PTT treatment enables us to improve phototherapeutic e±cacy significantly, it has been attracting a lot of investigations in current days. Here, we introduce IR-52, a new mitochondria-targeting near infrared (NIR) fluorescent small molecule, which possesses structure-inherent PTT and PDT synergistic phototherapeutic effects without conjugation to specific ligands. After NIR light irradiation (808 nm, 2W/cm2, 5 min), both the hyperthermia and excessive singlet oxygen levels were determined when dissolving IR-52 in aqueous solutions. In vitro photoinduced cytotoxicity studies showed significant lower cell viabilities and higher necrotic/apoptotic rates when cancer cells were treated with IR-52 and irradiation, and its' mitochondrial localization in cancer cells would partially explain its high cytotoxicity. Further in vivo synergetic PDT and PTT effects were demonstrated by high tumor surface temperature and significant inhibition of tumor growth. Our results strongly suggest that IR-52, which possesses excellent photosensitivity, may provide a promising strategy for tumor treatment with decreased side effects.
Photosensitizer photodynamic therapy photothermal therapy mitochondria Journal of Innovative Optical Health Sciences
2018, 11(4): 1850016
