1,723 research outputs found
Inferior pole peritonsillar abscess successfully treated by non-surgical approach in four cases.
No full textCanon Walls overhang the road, Shoshone Canon, Cody, Wy., The
No full textCanon Walls overhang the road, Shoshone Canon, Cody, Wy., Th
River from way north of Shoshone Canon, Cody, WY, The
No full textRiver from way north of Shoshone Canon, Cody, WY, Th
Improvement of Visible a-SiC:H Based p-i-n Type-Film LED Characteristics by Hydrogen Passivation
No full textFunctionalized Ionic Liquid and Sol-Gel Composite Film for the Electrochemical Reduction and Determination of Nitrite without Interference from Dissolved Oxygen
No full text[[abstract]]This work provides an easy way to fabricate a composite film-modified electrode, and used as an electrochemical nitrite sensor. A functionalized ionic liquid, 1-butyl-3-methylimidazolium ferricyanide (BMIMFC), has been synthesized and modified onto a screen-printed carbon electrode (SPCE) by deposition methods. Poly(3-(aminopropyl) trimethoxysilane) sol-gel (SG) is then used as the second modified layer. The surface morphology of the modified electrode (SPCE/BMIMFC/SG) is characterized using scanning electron microscopy (SEM). The modified electrodes exhibit a very stable redox couple, and its redox potential is pH-dependent. In strongly acidic solutions, attractive electrocatalytic activity for the reduction of nitrite is achieved. As an amperometric nitrite sensor, the modified electrode shows a wide linear range (20-510 mu M), a suitable sensitivity (0.0040 mu A/mu M) and a low detection limit (1.3 mu M, S/N = 3). Unlike previous reports on the electrocatalytic reduction of nitrite, the present detection assays indicate insignificant interference from dissolved oxygen and common salts, promising the convenient operation of the nitrite sensor.[[note]]SC
Electrocatalysis and sensitive determination of cysteine at poly(3,4-ethylenedioxythiophene)-modified screen-printed electrodes
No full text[[abstract]]The electrocatalytic oxidation of cysteine at screen-printed electrode (SPE) modified with electrogenerated poly(3,4-ethylenedioxythiophene) film (PEDOT) was investigated. Cyclic voltammetric studies showed that the SPE/PEDOT electrode lowers the overpotentials and improves electrochemical behavior of cysteine oxidation, as compared to the bare SPE. The catalytic oxidation responses were studied and the reaction mechanisms were discussed. Excellent analytical features, including high sensitivity, low detection limit and satisfactory dynamic range, were achieved by flow-injection amperometry under optimized conditions. (c) 2008 Elsevier B.V. All rights reserved.[[note]]SC
Electrochemical Oxidation and Sensitive Determination of Acetaminophen in Pharmaceuticals at Poly(3,4-ethylenedioxythiophene)-Modified Screen-Printed Electrodes
No full text[[abstract]]The current study reports electrocatalytic oxidation of acetaminophen at screen-printed electrode (SPE) modified with electrogenerated poly(3,4-ethylenedioxythiophene) (PEDOT) film. Cyclic voltammetric studies show that the SPE/PEDOT electrode lowers overpotentials and improves electrochemical behavior of acetaminophen (ACAP) in aqueous buffer solutions, compared to the bare SPE. Excellent analytical features are achieved, including high sensitivity, low detection limit and satisfactory dynamic range, by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and flow-injection amperometry (FIA) under optimized conditions. The proposed methods obtain satisfactory results in detection of acetaminophen in two commercial tablets.[[note]]SC
Improvement of amorphous-carbon active-layer thin-film light-emitting diodes using room-temperature ultrasound treatment
No full textUltrasound treatment (UST) applied at room temperature enhances electroluminescent intensity (maximum at 600 nm) and optical output in thin-film light-emitting diodes with hydrogenated amorphous-carbon as an active layer. This positive UST effect is attributed to a reduction of the diode series resistance caused by a change of the interface and contact resistances. The UST effect is saturated with increase of the ultrasound amplitude. (C) 1999 American Institute of Physics. [S0003-6951(99)02232-9]
Cloud distribution characteristics over the Tibetan Plateau
No full textWe use GMS5 satellite data and ISCCP cloud detection algorithm to study the characteristics of monthly mean cloud distribution and diurnal variation over the Tibetan Plateau. We simply classify total cloud into low, middle and high categories according to the height of cloud top. For the spatial distribution, during winter season both total and high cloud amounts of the north part of the Tibetan Plateau are larger than that of the south part of the Tibetan Plateau, but during summer season the distribution patterns are the reverse, that is, the cloud amounts of the south part of the Tibetan Plateau are larger than that of the north part of the Tibetan Plateau. For the diurnal variation, the total cloud amount begins to increase after sunrise and reaches maximum at 09GMT and 06GMT for midsummer season and other months respectively. After that total cloud amount decreases slowly. But the diurnal variation of high cloud amount is different from that of total cloud amount, high cloud amount begins to increase at noon time and reaches maximum at 09GMT and 12GMT for winter and summer season respectively. The diurnal variation of both total and high cloud amounts of the Tibetan Plateau is larger than that of the north part of the Indian Island.Meteorology & Atmospheric SciencesRemote SensingOpticsEICPCI-S(ISTP)
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