紫外分光光度法测定刺五加口服液中总黄酮含量

目的:建立紫外分光光度法测定刺五加口服液中总黄酮含量;方法:以芦丁为对照品,于360nm波长处测定吸收度;结果:在5μg/ml～25μg/ml范围内芦丁的浓度与吸光度呈现良好的线性关系(r=0.9998,n=5);结论:用本法测定刺五加口服液中总黄酮含量操作简便,灵敏度高,重现性好,方法可行。     

紫外分光光度法测定替硝唑注射液中替硝唑的含量的研究

目的：建立紫外分光光度法测定替硝唑注射液中替硝唑的含量。方法：紫外分光光度法,检测波长为317nm。     

用紫外分光光度法测定饮用水中硝酸盐氮的含量

本文采用紫外分光光度法测定水中硝酸盐氮的含量，通过大量实验，即对硝酸盐氮的吸收曲线测定，酸度干扰排除及回收率，精确度验证，并与二磺酸酚法进行比较，本文认为紫外法测定水中硝酸盐氮操作简便、快速、灵敏．     

紫外分光光度法测定蔬菜中的硝酸盐

本文利用紫外分光光度法具有的快速、简便等优点,用氢氧化铝胶体作为提取剂,测定了六种蔬菜中的硝酸盐的含量,加标回收率在98.5％～102％之间,具有较高的准确度。     

紫外分光光度法测定VC银翘片中维生素C含量

本文采用紫外分光光度法测定维C银翘片中维生素C含量,最大吸收波长为243nm,在p H=6的弱酸性条件下测定吸光度。线性回归方程:A=0.0040+0.0656*C,R2=0.99991。该法操作方便,结果准确,可用于含维C的药片中的维生素C的测定。     

紫外分光光度法测定污水中COD的研究进展

本文介绍了紫外分光光度法测定水中COD的测量原理及发展趋势,紫外分光光度法测定水中COD具有成本低、测量时间短、无污染等优点,已经得到了广泛的应用。     

紫外分光光度法测定鱼粉中的脂肪

本文作者用分光光度法代替经典的索氏抽提—重量法测定鱼粉中的脂肪含量。方法简单,准确。     

紫外分光光度法测定面粉中的过氧化苯甲酰

本文基于在酸性条件下,过氧化苯甲酰(BPO)能把Fe2 氧化成Fe3 ,再与邻菲罗啉发生褪色反应,建立了紫外分光光度法测定面粉中过氧化苯甲酰的方法.测定过氧化苯甲酰线性范围为1.0 ×10-7g/mL-3.2×10-6g/mL和3.2 ×10-6g/mL～2.4×10-5g/mL,检出限6.0×10～g/mL,对8.0 ×10-7g/mL过氧化苯甲酰连续11次测定的相对标准偏差RSD为4.2%,已用于面粉中过氧化苯甲酰的测定.     

紫外分光光度法测定水体总氮的影响因素

本文就紫外分光光度法在测定水体总氮中易影响测定工作的几个方面做了阐述,并提出了改进意见     

紫外分光光度法测定刺五加总苷总黄酮软胶囊中总苷含量

建立紫外分光光度法测定刺五加总苷总黄酮软胶囊中总苷含量;方法:以总苷为对照品,在波长265nm处测定刺五加总苷总黄酮软胶囊中总苷含量。结果:用紫丁香苷做对照品,其线性范围20.56～102.8μg/ml,r=0.9995,其平均回收率为98.92%,加样回收率为1.5%(n=5)。结论:该方法灵敏度高,重复性好,简单,准确,是一种测定刺五加总苷总黄酮软胶囊中总苷含量的有效方法。     

紫外光分光光度法测定食品包装纸用天然色素虎杖黄酮含量的研究

研究了紫外光分光光度法测定食品包装纸用色素虎杖黄酮含量的方法,以芦丁为参照品,测量波长为359nm,平均回收率为99.96%,精密度为1.34%,说明紫外分光光度法是一种较理想的测定方法.     

Surface potential behaviors of UV treated of Ag anode for high-performance T-OLED by nanotribology

A high reflective bottom anode is essential for high-performance top-emitting organic light emitting devices (OLEDs). Ag has high reflectivity for visible light but its electronic properties are not ideal for anodes of OLEDs. Thus, we investigated the UV treatment effect of Ag film with a thin silver oxide layer at the surface for application of top-emitting OLEDs. In this study, we measured the change of potential difference between Ag film and ITO (indium tin oxide) films, according to UV treatment time and the mechanical properties by KPFM (Kelvin Probe Force Microscope) method and nano-indenter system, respectively. The KPFM and nano-indenter results show that the differences of surface potential and surface volume change according to UV treatment time.     

医用聚氯乙烯材料的表面光接枝改性

研究了在不排氧氛围下 ,紫外光照射 ,以二苯甲酮 (BP)为光引发剂 ,甲基丙烯酸缩水甘油酯(GMA)在医用聚氯乙烯 (PVC)薄膜表面的气相接枝聚合。探讨了反应条件对接枝结果的影响 ,并用正交法指出了影响因素的显著性。用傅立叶红外 (FT- IR)、水接触角作为接枝改性结果的表征。FT- IR谱图表明 GMA已接枝到 PVC膜表面。水接触角由接枝前的 78°下降到 5 4°     

Evaluation of ethylene-propylene-diene monomer (EPDM) aging in UV/condensation environment by principal component analysis (PCA)

Artificial weathering tests on ethylene-propylene-diene monomer (EPDM) were conducted in UV/condensation environment for different time periods up to 90 days. Principal component analysis (PCA) was used to evaluate the 11 aging parameters of EPDM including surface properties, crosslink density and mechanical properties. The results showed that EPDM aged quickly in the first 18 days of exposure and then slowed up. Among the 11 evaluating parameters, tensile stress at 100% elongation, surface tension and carbonyl content are strongly associated. The crosslink density is also well correlated with the hardness.     

紫外线(UV)固化技术在数字成像材料中的应用(三)UV固化技术在计算机直接制版(CTP)中的应用

近年来，数字成像技术不断提高和应用范围的迅速推广，也推动了UV固化技术在这一领域的融合和应用，取得了极大的成效，由于UV固化材料具有快速固化、高效、低污染、节能、优质等特点，很快发展成为一种新型的数字成像材料。目前实现产业化的主要有UV喷墨打印、印刷电路版数字化制作、计算机直接制版CTP、立体光刻等四种技术，作者拟分为四个专题予以阐述，本文主要讨论其第三个专题：UV固化技术在计算机直接制版（CTP）中的应用。     

紫外光原位固化纳米复合材料制备的优化设计

用正交试验法优化了紫外光原位固化制备纳米复合材料过程中分散时间、活性单体之间的比例、环氧丙烯酸酯树脂含量和纳米SiO2含量之间的配比。试验结果表明,优化制备的纳米SiO2／环氧丙烯酸酯树脂复合材料的力学性能、收缩率、光学性能均有较大的提高,纳米SiO2在基体中得到比较均匀的分散。     

Rapid thermal annealed Al-doped ZnO film for a UV detector

A low-resistive Al-doped ZnO (AZO) film was achieved by rapid thermal annealing. A co-sputtering method was used in the initial growth of AZO films and a rapid annealing process was performed on the as-deposited AZO film under N₂ atmosphere for 3 min. An as-deposited AZO film had an optical transmittance of 84.78% at 550 nm and a resistivity of 7.8 × 10^− 3 Ω cm. A rapid annealing process significantly improved the optical transmittance and electrical resistivity of the AZO film to 99.67% and 1 × 10^− 3 Ω cm, respectively. The structural changes of the AZO films were investigated by X-ray diffraction and transmission electron microscopy. The high quality AZO film was used to fabricate a metal-semiconductor-metal (MSM) structure for a UV detector. The MSM device provided a stable current of 25 μA at a bias of 2 V in a dark condition. Under UV illumination, the MSM device was highly responsive to UV light uniformly and repeatedly, and it enhanced the current by 80% at 45 μA. This rapid thermal annealing process may provide a useful method to fabricate quality AZO films for photoelectric applications with a low thermal budget.     

Formation of Cd particles by UV laser irradiation

Formation of the metal particles of Cd has been studied by nanosecond laser flash photolysis using an ArF excimer laser with the oscillation wavelength of 193 nm. The sample was a 10% methanol solution of CdCl₂. The solvated electron, e_aq⁻, was generated by the excitation of charge transfer bands of Cl⁻ to solvent. The e_aq⁻ efficiently reduced Cd²⁺ to Cd⁺ during a laser pulse of 30 ns (FWHM). The Cd particles were produced by the reaction between Cd⁺ and Cd⁺. In the air saturated solution, the Cd⁺ was easily oxidized by dissolved oxygen. The concentration of the Cd particles formed in the degassed solution was approximately twice of that in the air saturated solution.