碘回收工艺中硫酸盐含量的快速测定

介绍了一种用UV-1600型紫外可见分光光度计快速测定碘回收工艺中硫酸盐含量的方法.以氯化镁、乙酸钠、硝酸钾和乙醇为缓冲溶液,在440nm处测量吸光度,硫酸盐浓度在0-50μg/mL符合比耳定律,可决系数为0.9996.将所得碘吸收液中硫酸盐含量与重量法所得结果对比,确定分光光度法是实验室快速测定碘回收工艺中硫酸盐含量...     

固相分光反射光度法测定药物中的合成色素

固相分光光度法是一种简单，快速，灵敏的新型痕量的分析方法，本文首次提出用聚酰胺做吸附剂，采用改造的比色皿，测量反射器吸光度的方法，将固相分光光度法的应用由仅能分析痕量的无机离子，推广到测量药物中的合成色素，结果令人满意。     

杂多酸(蓝)分光光度法在测定痕量元素中的研究进展

杂多酸能被还原为有颜色的杂多蓝,结合分光光度法,可对痕量元素进行准确的分析。目前,杂多酸分光光度法作为一种分析技术,具有精度高、操作简便、分析速度快等优点,在痕量分析领域得到了迅速发展。文章综述了杂多酸在测定痕量元素P, As, Si和V中的应用及研究进展。方法主要包括钼蓝法、杂多酸-碱性染料法、荧光分光光度法、流动注射分光光度法、原子吸收分光光度法、激光热透镜分光光度法等,并对这些方法进行了比较分析。     

水样中总铬测定方法研究

用石墨炉-原子吸收光谱法(GF-AAS)和高锰酸钾-二苯碳酰二肼分光光度法,对环境水中的总铬进行了比较测定.结果表明:两种方法测定总铬的各项指标均在要求范围内,两种方法测定结果的RSD值均≤4.7%,加标回收率在94.5%-110%之间;表明两种方法均可测定水中总铬;但是石墨炉-原子吸收光谱法操作简便快速,更稳定.     

快速、高精度可见光-近红外透射光谱测量技术研究

基于传统分光光度测量方法的构架,提出了一种快速、高精度测量可见光-近红外透射光谱的新方法,在该方法的测量过程中,光栅单色器的出射波长保持匀速的连续变化,同时参考光探测器和测试光探测器保持连续的光强采集。初步实验研究表明,新方法可把测量耗时降低到传统分光光度法所需时间的50%以下,测量得到的透射光谱与传统分光光度法的相对误差为0.070%,三次重复性测量的统计误差为0.042%。与现有常见可见光-近红外透射光谱的测量方法(分光光度法、CCD光谱仪法、傅里叶变换光谱仪法)相比,新方法同时具有以下优点：(1)有望显著提高可见光-近红外透射光谱的测量速度,从而应用于透射光谱的动态测量环境中;(2)具有较高的测量精度(0.1%～0.3%);(3)在测量过程中,系统的机械部件始终保持匀速的运动状态,测试系统因而具有较高的机械稳定性。     

快速、高精度可见光-近红外透射光谱测量技术研究（英文）

基于传统分光光度测量方法的构架,提出了一种快速、高精度测量可见光-近红外透射光谱的新方法,在该方法的测量过程中,光栅单色器的出射波长保持匀速的连续变化,同时参考光探测器和测试光探测器保持连续的光强采集。初步实验研究表明,新方法可把测量耗时降低到传统分光光度法所需时间的50%以下,测量得到的透射光谱与传统分光光度法的相对误差为0.070%,三次重复性测量的统计误差为0.042%。与现有常见可见光-近红外透射光谱的测量方法(分光光度法、CCD光谱仪法、傅里叶变换光谱仪法)相比,新方法同时具有以下优点:(1)有望显著提高可见光-近红外透射光谱的测量速度,从而应用于透射光谱的动态测量环境中;(2)具有较高的测量精度(0.1%~0.3%);(3)在测量过程中,系统的机械部件始终保持匀速的运动状态,测试系统因而具有较高的机械稳定性。     

硅钼蓝分光光度法测定去离子水中的微量二氧化硅

研究了抗坏血酸作为还原剂硅钼蓝分光光度法测定去离子水中的微量二氧化硅的适宜条件.实验表明,常温下10min可显色完全,对去离子水进行7次测定,方法精密度RSD≤7%,样品加标回收率为97%,测定结果与国家标准结果一致.     

非洛地平缓释片释放度检测方法的比较

制备了非洛地平缓释片,对其释放度的检测方法进行考察。采用紫外分光光度法和高效液相色谱法分别测定非洛地平缓释片在1%吐温-80释放介质中的释放度,并分别对两种方法进行了方法学验证。结果表明紫外分光光度法和高效液相色谱法两者都符合释放度测定的要求,且两种方法测定的释放度结果没有显著的差异。     

蔬菜中铁含量的测定及方法比较

用分光光度法直接测定蔬菜中铁的含量,方法简便、快速、准确.分别采用浓盐酸和浓硫酸两种消解方法对样品进行处理,并对其测定结果进行比较,实验结果表明,浓硫酸消解法消解能力更强,测定更为准确.5种蔬菜中木耳铁含量最高,对指导人们合理食用蔬菜进行补铁及进一步开发蔬菜产品提供了可靠的理论依据.     

火焰原子吸收光谱法测定XF-210膦羧酸缓蚀阻垢剂中的钴

本文研究了XF-210膦羧酸缓蚀阻垢剂中微量金属元素钴的火焰原子吸收分光光度法的测定,方法简便,省时,具有良好的精密度和准确度.平均相对标准偏差为1.42%,平均回收率为95.7%.     

碘量法测定葡萄糖含量微型实验研究

微型滴定法测定葡萄糖注射液中葡萄糖的含量,并对微型滴定法与常量滴定法的平行测定结果进行了比较,结果无显著性差异,F检、T检结果均在允许范围内,相对偏差均小于2.0%,微型滴定法的精度达到常量滴定法测定水平,能满足化学分析要求.     

Free vibration of size-dependent Mindlin microplates based on the modified couple stress theory

This paper develops a Mindlin microplate model based on the modified couple stress theory for the free vibration analysis of microplates. This non-classical plate model contains an internal material length scale parameter related to the material microstructures and is capable of interpreting the size effect that the classical Mindlin plate model is unable to describe. The higher-order governing equations of motion and boundary conditions are derived using the Hamilton principle. The p-version Ritz method is employed to determine the natural frequencies of the microplate with different boundary conditions. A detailed parametric study is conducted to study the influences of the length scale parameter, side-to-thickness ratio and aspect ratio on the free vibration characteristics of the microplate. It is found that the size effect is significant when the thickness of microplate is close to the material length scale parameter.     

Synthesis and Characterization of Oxazine-doped Silica Nanoparticles for Their Potential Use as Stable Fluorescent Reagents

The synthesis process to obtain silica nanoparticles (NPs) doped with two oxazine dyes, nile blue and cresyl violet, has been investigated using a modification of the reverse micelle microemulsion method and a procedure based on the Stöber method. A micellar medium provided by the non-ionic surfactant Triton X-100 in a hexanol:water mixture and an ethanol:water mixture, have been used to provide the synthesis medium in each case. Tetraethoxysilane has been used as the initiator of the polymerization and condensation reactions after its hydrolysis in basic medium using ammonium hydroxide. Dye-silane precursor NPs have been also synthesized in order to compare their potential advantages against the NPs obtained by the direct encapsulation of the oxazine dyes. Size distribution and fluorescence of the synthesized NPs, which were monitored using Transmision Electron Microscopy (TEM) and a microplate reader, respectively, depend on the molar ratio and total concentration of the reagents involved in the synthesis. NPs obtained using the developed synthesis procedures had sizes below 400 nm in most instances and the best luminescent properties were observed for NPs with sizes ranging from 100 to 300 nm. Lower sizes result in a decrease in the fluorescence intensities of these nanomaterials. Parameters related with the luminescence features of these NPs were calculated in order to compare the feasibility of both synthesis approaches. The repeatability of the reverse-micelle microemulsion procedure performed in different days gave a relative standard deviation of 10% for the fluorescence intensity values.     

新型胶片影像判读仪的应用研究

针对狭缝摄影胶片参数测量和处理的自动化低,人为因素多,提出一种新型胶片影像判读仪。通过将光源照射到待扫描的材料上完成图像的获取,光源照射到CCD上实现光电转换。对胶片图像进行数字化处理,利用软件进行图像处理。结果表明,应用该判读仪实现了大幅面（830 mm190 mm）彩色胶片图像输入。平面结构和精密的传动系统保证了测量要求的全幅面小于0.1 mm的精度,提高了胶片判读的自动化程度和数据的精确测量及处理。     

Performance Validation for Microplate Fluorimeters

As the sophistication of instruments that make fluorimetric measurements on samples in microplates has increased, so has the need for methods to validate instrumental performance. This paper describes a solid-state validation microplate that tests multiple aspects of fluorescence performance, including signal linearity, gain, noise, sensitivity, wavelength accuracy, and polarization stability. Both the operating principles and the validation of the validation microplate are discussed.     

基于RFID无阻塞扫描控制的机器人室内定位设计

针对RFID移动机器人室内定位中的标签扫描问题,提出一种基于六边形分布模式的RFID无阻塞扫描控制方案,用于机器人的室内定位系统设计和误差检测。首先,将RFID标签根据六边形模式进行分布,减小位置估计的静态误差;然后,阅读器利用固定信道分配(FCA)方法给每个标签分配ID,使阅读范围内标签ID都不相同;最后,当阅读器读取信息时,发送查询请求给范围内的标签,标签根据自身ID决定应答时隙,避免冲突。实验结果表明,相比基于树的扫描控制方案,本文方案能够降低标签/阅读器的复杂度,同时具有较小的位置估计误差和扫描延迟,可帮助机器人实现精确定位。     

Liquid crystals and some of their applications

This paper is a brief review of some of the properties and applications of liquid crystals. By studying the references, a reader can gain a more extensive insight into the liquid crystalline state. Classifications of liquid crystalline materials and nomenclature characteristic of the field give the reader a working knowledge of the subject. Polymorphism is one of the common properties of liquid crystalline materials; the subject is covered in the text and summarized in tabular forms. The fundamental properties of liquid crystals are correlated with some of the behaviors and uses of liquid crystals. Optical properties, curvature elastic properties, surface effects, external field effects and hydrodynamics of the liquid crystalline state are discussed as necessary to describe recent practical applications; these include displays, storage of images and other electrooptic devices. Some of the results presented in this review were obtained under NSF Grant No. GH-34164X.     

Direct fabrication of freely movable microplate inside photosensitive glass by femtosecond laser for lab-on-chip application

We demonstrate the fabrication of complicated three-dimensional (3D) microstructures embedded in a photosensitive glass by a high-order multiphoton process using a femtosecond (fs) laser. Direct writing of the fs laser followed by a post baking process and preferential etching in a dilute hydrofluoric (HF) acid solution results in a microplate that can freely move in hollow structures embedded in the glass. The fabricated structure functions as a microvalve that can control the flow direction of fluids in the microreactor. PACS 42.62.-b; 81.05.Kf; 82.50.Pt     

无源标签反向散射调制性能的分析和测试

分析了无源超高频射频识别系统阅读器接收机获得最大有效吸收功率的标签侧条件,讨论阻抗失配对标签反向散射链路调制系数的影响,导出阅读器接收机归一化有效吸收功率、解调输出信号的信噪比下边界和接收端误码率三者的反向散射调制系数表达式.在开阔的室内环境下,完成了不同参数条件下的反向散射调制系数测试.测试研究表明,反向散射调制系数位于区间 时,标签可以被正确识别. 关键词： 射频识别 无源标签 反向散射调制 调制系数     

Development of Dissociation-Enhanced Lanthanide Fluoroimmunoassay for Measuring Leptin

Development of a dissociation-enhanced lanthanide fluoroimmunoassay (DELFIA) for measuring leptin, a satiety hormone of appetite control, was conducted in sandwich assay format exploiting a microplate immobilized with an anti-leptin antibody and another antibody raised against leptin and tagged with an europium chelate. In the leptin DELFIA of this study, amounts of antibody coated to the microplate and of the bioconjugate for the second immune reaction were optimized as 0.5 μg and 200 ng per well, respectively. When plotted in double-logarithmic scale, a linear relationship of y (log₁₀ response signal) = 0.6023× (log₁₀ leptin concentration) + 3.4084 (r² = 0.9646) was obtained at the leptin concentrations of 0.01─50 ng/mL with the limit of detection of 0.01 ng/mL. Individual leptin concentrations in various samples were well convergent to the calibration curve of the current assay. When applied to the measurement of leptin in a rat serum, the present assay was found quite effective and was competitive to a commercial sandwich-type ELISA.