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Kęstutis Arlauskas Arūnas Baronas Nerijus Nekrašas Karolis Kazlauskas 《Journal of Non》2008,354(19-25):2160-2163
Using three electrode vacuum system for glow discharge of 5% SiH4 + 95% Ar gas mixture together with thermal evaporation of phosphorus or boric aced, the n- and p-type a-Si:H layers have been deposited. By co-evaporation of phosphorus or boric aced the conductivity of a-Si:H layers was changed in 10?11–10?3 Ω?1 cm?1 or 10?11 –10?8 Ω?1 cm?1 range, respectively. Blends of a-Si:H and tris-(8-hydroxyquinoline) aluminum (Alq3) have been vacuum-deposited by simultaneous glow discharge of 5% SiH4 + 95 % Ar gas mixture and thermal co-evaporation of Alq3. Photoluminescence spectrum of a-Si:H/Alq3 blend coincident with one of Alq3 was observed at room temperature. 相似文献
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Development of an SPE method for the determination of zaleplon and zopiclone in hemolyzed blood using fast GC with negative‐ion chemical ionization MS 下载免费PDF全文
Nerijus Karlonas Arunas Ramanavicius Almira Ramanaviciene 《Journal of separation science》2014,37(5):551-557
An SPE procedure for the determination of zaleplon and zopiclone in low‐volume human hemolyzed blood using fast GC with negative‐ion chemical ionization MS has been developed and validated. Both analytes were well retained on Oasis MCX and HLB columns, and sufficient extraction efficiency was achieved at pH 9.0. For further study a hydrophilic‐lipophilic sorbent Oasis HLB was selected due to the polarity of sorbent surface and its large surface area in order to achieve efficient extraction of both analytes in a single step. Special attention has been paid to choosing washing and eluting solvents, resulting in a particularly/extremely clean and moisture‐free extract. The mean extraction efficiency was higher than 90.1% for zaleplon and 82.9% for zopiclone. The precision for zaleplon and zopiclone was between 3.04–10.58% and 4.08–9.52%, respectively. Whereas the accuracy was in the range from –5.73 to 6.00%, and from –7.00 to 6.32% for zaleplon and zopiclone, respectively. The results show that the developed method is accurate, selective, precise, and very fast with excellent recovery and low LOD and LOQ. 相似文献
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Nerijus Karlonas Audrius Padarauskas Arunas Ramanavicius Almira Ramanaviciene 《Journal of separation science》2013,36(8):1437-1445
A sensitive and selective method for simultaneous quantitation of 15 benzodiazepines in human whole blood using rapid GC with negative‐ion chemical ionization MS is proposed. A mixed‐mode cation‐exchange polymeric sorbent was used for SPE. Different extraction solvents or mixtures of solvents of different compositions for elution of the adsorbed analytes, and washing steps for eliminating interferences in the column were tested. Analytes were eluted from the column using 5% v/v NH4OH in methanol. A derivatization step using different silylation reagents, time, and temperature was tested. Extracts from SPE were silylated by a mixture of N‐(tert‐butyldimethylsilyl)‐N‐methyltrifluoroacetamide, acetonitrile, ethyl acetate, and subjected to gas chromatographic analysis. The LODs of 15 benzodiazepines in whole blood samples ranged from 0.24–0.62 ng mL?1. The RSDs of samples used for three different quality control concentration levels were lower than 7.0%, and the accuracy ranged from 89.5 to 110.5%. The results show that the developed method is accurate, sensitive, selective, and very fast. Finally, the applicability of this method for determination of trace concentrations of several benzodiazepines in real blood samples has been demonstrated. 相似文献
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Aivaras Urnie?ius Nerijus ?iaulys Via?eslav Kudria?ov Valdas Sirutkaitis Andrius Melninkaitis 《Applied Physics A: Materials Science & Processing》2012,108(2):343-349
We studied evolution of femtosecond laser ablation by employing novel method of time-resolved off-axis digital holographic microscopy. Phase and amplitude profiles of early shock front and ablation plume dynamics of irradiated tempered steel were reconstructed from the digital holograms. In order to gain additional information, digital holographic microscopy was combined with plasma emission imaging. By using both techniques simultaneously we studied material response to multi-pulse irradiation, shock wave propagation, ablation plume formation and plasma emission. The significant changes in ablation performance were observed when using multi-pulse irradiation if compared to widely investigated single-shot regime. 相似文献
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