In this paper, a novel SPME mode, PDMS-coated solid glass microspheres （SGMs）, were prepared by sol-gel method. Using homemade thermal desorption unit coupled with CGC-FID, six PAHs as model analytes, the performanc...In this paper, a novel SPME mode, PDMS-coated solid glass microspheres （SGMs）, were prepared by sol-gel method. Using homemade thermal desorption unit coupled with CGC-FID, six PAHs as model analytes, the performance of the new mode was characterized. The new extractive phase exhibited high thermal stability and satisfactory extraction capability. The detection limits were 0.01-0.045 ng/mL, and the linearity was from 0.5 ng/mL to 96 ng/mL. The R.S.D.s of repeatability for retention time and peak area were all within 0.074% and 6.7%, respectively. The recoveries of the PAHs were 78-127% from the samples taken from river water.展开更多
The spectral fluorescence characteristics of extracts leaves embedded in silica xerogel matrix promoted by aged time was studied. We obtain a higher PSII stability for extract of leaves embedded in xerogel matrix, wit...The spectral fluorescence characteristics of extracts leaves embedded in silica xerogel matrix promoted by aged time was studied. We obtain a higher PSII stability for extract of leaves embedded in xerogel matrix, with concentration of 8 g / 20 ml and water to TEOS molar ratio of 11, which remain bioactive over a very long period of time, whereas for a water to TEOS molar ratio of 5 a blue-shift fluorescence is observed indicating the PSII denaturizing and formation of fluorescing aggregates associated with the activation of carotenoids radicals.展开更多
采用溶胶-凝胶-硫化法，以甲基乙烯基硅橡胶和乙烯基封端硅橡胶为原料制备了厚壁硅橡胶吸附萃取搅拌棒（ stir bar for sorptive extraction, SBSE）。采用分段硫化和多阶程序升温老化防止涂层脱落和龟裂，一次涂渍涂层厚度约150～250μ...采用溶胶-凝胶-硫化法，以甲基乙烯基硅橡胶和乙烯基封端硅橡胶为原料制备了厚壁硅橡胶吸附萃取搅拌棒（ stir bar for sorptive extraction, SBSE）。采用分段硫化和多阶程序升温老化防止涂层脱落和龟裂，一次涂渍涂层厚度约150～250μm，280℃下无流失，使用寿命可达150次。利用所制备涂层，结合自制热解析系统（thermal desorption system，TDS），建立了SBSE-TDS-CGC-FID测定水样中6种多环芳烃（polyaromatic hydrocarbons，PAHs）的方法。方法的线性范围为0．3～1000μg/L，检出限为0．002～0．011μg/L，相对标准偏差在0．92％～6．14％之间。该方法能够满足欧盟2005／69／EC指令对多环芳烃低于10mg/kg的检测要求。展开更多
基于BSIMSOI模型研究了深亚微米级部分耗尽型绝缘体上硅金属氧化物半导体场效应晶体管(PD SOI MOSFET)器件的自加热效应、体接触效应及浮体效应,并提出了PD SOI MOSFET的建模方法及相应的模型参数提取方法。根据上述方法对西安微电子技...基于BSIMSOI模型研究了深亚微米级部分耗尽型绝缘体上硅金属氧化物半导体场效应晶体管(PD SOI MOSFET)器件的自加热效应、体接触效应及浮体效应,并提出了PD SOI MOSFET的建模方法及相应的模型参数提取方法。根据上述方法对西安微电子技术研究所0.35μm工艺条件下的PD SOI器件进行了建模和验证,结果显示所建立的模型与测试数据吻合,表明本文所提方法的准确性及有效性。展开更多
文摘In this paper, a novel SPME mode, PDMS-coated solid glass microspheres （SGMs）, were prepared by sol-gel method. Using homemade thermal desorption unit coupled with CGC-FID, six PAHs as model analytes, the performance of the new mode was characterized. The new extractive phase exhibited high thermal stability and satisfactory extraction capability. The detection limits were 0.01-0.045 ng/mL, and the linearity was from 0.5 ng/mL to 96 ng/mL. The R.S.D.s of repeatability for retention time and peak area were all within 0.074% and 6.7%, respectively. The recoveries of the PAHs were 78-127% from the samples taken from river water.
文摘The spectral fluorescence characteristics of extracts leaves embedded in silica xerogel matrix promoted by aged time was studied. We obtain a higher PSII stability for extract of leaves embedded in xerogel matrix, with concentration of 8 g / 20 ml and water to TEOS molar ratio of 11, which remain bioactive over a very long period of time, whereas for a water to TEOS molar ratio of 5 a blue-shift fluorescence is observed indicating the PSII denaturizing and formation of fluorescing aggregates associated with the activation of carotenoids radicals.
文摘采用溶胶-凝胶-硫化法，以甲基乙烯基硅橡胶和乙烯基封端硅橡胶为原料制备了厚壁硅橡胶吸附萃取搅拌棒（ stir bar for sorptive extraction, SBSE）。采用分段硫化和多阶程序升温老化防止涂层脱落和龟裂，一次涂渍涂层厚度约150～250μm，280℃下无流失，使用寿命可达150次。利用所制备涂层，结合自制热解析系统（thermal desorption system，TDS），建立了SBSE-TDS-CGC-FID测定水样中6种多环芳烃（polyaromatic hydrocarbons，PAHs）的方法。方法的线性范围为0．3～1000μg/L，检出限为0．002～0．011μg/L，相对标准偏差在0．92％～6．14％之间。该方法能够满足欧盟2005／69／EC指令对多环芳烃低于10mg/kg的检测要求。
文摘基于BSIMSOI模型研究了深亚微米级部分耗尽型绝缘体上硅金属氧化物半导体场效应晶体管(PD SOI MOSFET)器件的自加热效应、体接触效应及浮体效应,并提出了PD SOI MOSFET的建模方法及相应的模型参数提取方法。根据上述方法对西安微电子技术研究所0.35μm工艺条件下的PD SOI器件进行了建模和验证,结果显示所建立的模型与测试数据吻合,表明本文所提方法的准确性及有效性。
