排序方式: 共有18条查询结果,搜索用时 0 毫秒
1.
2.
3.
Barry G. Grossman Thanaphong Yongphiphatwong Michael Sokol 《Optics & Laser Technology》2005,37(3):273-223
Microbend sodium chloride sensors based on polymer swelling are the latest approach to fiberoptic sodium chloride sensors. We have designed, constructed, and tested a compact microbend fiberoptic sodium chloride sensor that utilizes microbend and polymer swelling effects through the use of modified polymer beads. The design of this sensor is an improvement over previously reported microbend sensors. This sodium chloride sensor has shown feasibility as a practical, stable, inexpensive device with excellent performance and most of the desirable sensor properties including reversibility. Further optimization of the sensor is possible for the various applications we envision. 相似文献
4.
5.
6.
Sheila V. Stager Rebecca Neubert Susan Miller Joan Roddy Regnell Steven A. Bielamowicz 《Journal of voice》2003,17(3):395-402
Supraglottic activity was rated from flexible endoscopic video recordings of subjects with normal laryngeal structure and function as they sustained vowels and repeated syllables and sentences. Judges rated these recordings for false vocal fold (FVF) adduction and anterior-to-posterior (A-P) compression at the initiation of the speech task, throughout the whole speech task (static supraglottic activity), and as brief individual adductions within a speech task (dynamic supraglottic activity). Significant differences in A-P (p < 0.0003) and FVF (p < 0.0000001) compression were found between tasks. Dynamic FVF activity was associated with glottal stops. Static A-P and FVF activities were present in males significantly more (p < 0.0001) than females. FVF activity associated with speech initiation was found in females significantly more (p = 0.0256) than males. Supraglottic activity plays a role in normal speech production, and should not necessarily be considered suggestive of a voice use pattern with excessive muscle tension. 相似文献
7.
8.
9.
The chemiluminescence of luminol in the presence of H2O2 has been exploited to develop fiberoptic biosensors associated with flow injection analysis systems. A chlorophenol sensor
was developed based on the ability of certain halophenols to enhance the peroxidase-catalyzed luminol chemiluminescence. Horseradish
peroxidase immobilized on a collagen membrane was used. Ten chlorophenols have been tested with this chemiluminescent-based
sensor. The lower detection limit was obtained with 4-chloro-3-methylphenol and was equal to 0.01 μM. Electrochemiluminescent-based fiberoptic biosensors for glucose and lactate were also developed using glucose oxidase or
lactate oxidase immobilized on polyamide membranes. In the presence of oxidase-generated H2O2, the light emission was triggered electrochemically by means of a glassy carbon electrode polarized at +425 mV vs a platinum
pseudo-reference electrode. The detection limits for glucose and lactate were 150 and 60 pmol, respectively, and the dynamic
ranges were linear from 150 pmol to 600 nmol and from 60 pmol to 60 nmol, respectively. 相似文献
10.