紫外分光光度法同时测量水中NO3^—和NO2^—离子

研究了利用多波长导数－－最小二乘回归一紫外分光光度法同时测量水中ＮＯ３和Ｎ炉子了含量的方法,通过测试体系在ＰＨ＝６￣７,２００￣２１８ｎｍ的吸光度,利用多波长求导及最小二乘法计算水中ＮＯ３和ＮＯ２离子的呈,并与最大吸收峰值法及多波长线形回归法进行比较,结果表明,多波长导数－－最小二乘回归优于后两者。     

PEGylated Tantalum Nanoparticles: A Metallic Photoacoustic Contrast Agent for Multiwavelength Imaging of Tumors

Elemental tantalum is a well‐known biomedical metal in clinics due to its extremely high biocompatibility, which is superior to that of other biomedical metallic materials. Hence, it is of significance to expand the scope of biomedical applications of tantalum. Herein, it is reported that tantalum nanoparticles (Ta NPs), upon surface modification with polyethylene glycol (PEG) molecules via a silane‐coupling approach, are employed as a metallic photoacoustic (PA) contrast agent for multiwavelength imaging of tumors. By virtue of the broad optical absorbance from the visible to near‐infrared region and high photothermal conversion efficiency (27.9%), PEGylated Ta NPs depict high multiwavelength contrast capability for enhancing PA imaging to satisfy the various demands (penetration depth, background noise, etc.) of clinical diagnosis as needed. Particularly, the PA intensity of the tumor region postinjection is greatly increased by 4.87, 7.47, and 6.87‐fold than that of preinjection under 680, 808, and 970 nm laser irradiation, respectively. In addition, Ta NPs with negligible cytotoxicity are capable of eliminating undesirable reactive oxygen species, ensuring the safety for biomedical applications. This work introduces a silane‐coupling strategy for the surface engineering of Ta NPs, and highlights the potential of Ta NPs as a biocompatible metallic contrast agent for multiwavelength photoacoustic image.     

实用双纵横激光精密测距仪

分析了无导轨大尺寸测量技术的现状,指出采用He-Ne激光器进行多波长干涉小数重合法测量大尺寸能较为有效地解决无导轨大尺寸测量问题,在分析了现有的两种He-Ne激光多波长干涉无导轨大尺寸测量技术的特点的基础上,介绍了一种稳频系统简单可靠,频率及频差稳定（在工业现场环境）,合成波长合适,测量过程简捷的双纵模激光精密测距仪,它完全满足对大尺寸工件进行测量的精度及环境的适用性的要求,其在50m测量范围内精度可达±（50+1.5×10     

Multiwavelength erbium-doped fiber laser exploiting intracavity polarization inhomogeneity

Simultaneous multiwavelength lasing is demonstrated exploiting intracavity polarization in-homogeneity in an erbium-doped fiber laser. Experiments indicate that polarization hole burning can be enhanced by the changes of optical MQW waveguide bias current and the polarization states in the laser cavity. Ten wavelengths with 0.9 nm spacing are generated at room temperature.     

多波长K系数法同时测定镁合金中的铜、锰、锌

用多波长K系数法同时测定镁合金中的Cu、Mn、Zn,并对多波长K系数法测定条件的选择进行了有益的探讨。     

多波长掺铒光纤激光器的研究进展

综合报道了几种新型多波长掺铒光纤激光器,并对这些激光器的机理、实验装置及结果进行了详细的介绍,并展望多波长掺铒光纤激光器的发展方向。     

K系数-多波长线性回归分光光度法同时测定原油中的铁、钴、镍

提出一种同时测定三组份的新方法 ,即K系数 -多波长线性回归分光光度法 ,用于同时测定原油中的铁、钴、镍。以OP -5-Br-PADAP为显色体系 ,控制 pH为 4 0以消除干扰。相对标准偏差在 1 1 %～ 5 3%之间。该方法简便、准确 ,灵敏度高。     

多波长线性回归光度法同时测定食品中钙镁

在pH =8 .8的硼砂缓冲溶液中 ,三氯偶氮氯膦分别与Ca2 + 和Mg2 + 形成稳定的配合物。用多波长线性回归光度法同时测定钙、镁。合成样品中钙和镁的回收率分别为 94%～ 10 5 %和 95 %～ 10 4%。该方法应用于食品中钙、镁含量的测定 ,结果满意     

光纤光栅激光器

概述了光纤光栅激光器的特点及其作为光通信系统中的光源所具有的优点。综述了单波长、多波长光纤光栅激光器的发展情况,并阐述了光纤光栅激光器的应用前景。