reflection-based sensor for gaseous ammonia

... of BCG-based sensors. Sensors were prepared at 12V(A)and at 18 V (B). 256 Á. Markovics et al. / Sensors and Actuators B 139 (2009) 252–257 Table 1 Parameters of BCG-based ammonia sensors made ... depro- tonated form of the dyes (Fig. 5). In order to compare the sensitivities of the different sensors, we investigated which concentration of gaseous ammonia results in a 25% relative signal...

Ngày tải lên: 20/03/2014, 13:06

... the TiO 2 thin film gas sensor was studied for sensing ammonia. © 2006 Elsevier Inc. All rights reserved. Keywords: TiO 2 ; Thin films; Gas Sensor; Sputtering; Ammonia sensor 1. Introduction There ... for the development of cheap, reliable sensors for control and measuring systems, for automation of services and microelectronics with an excellent performance, reli- ability an...

Ngày tải lên: 20/03/2014, 13:11

... parameter for gas sensors. Most of the nanotube based gas sensors have slow recovery time ranging from several minutes to several hours [1,11,12,16], which limits the practical application of these sensors. ... Chemical journal homepage: www.elsevier.com/locate/snb La 0.5 Sr 0.5 CoO 3−ı nanotubes sensor for room temperature detection of ammonia Wei Liu a,b,c , Sheng Wang a , Yu Chen a...

Ngày tải lên: 20/03/2014, 13:04

... increased affinity for sensing. Taken together, these data show that transport by UhpC is not required for sensing, that conserved arginine residues are important for sensing and not for transport, ... no genes for sensing or regulation (uhp elements) have been identified in this species [9]. For an obligate intracellular bacterium such as Chlamydia there was probably no driving forc...

Ngày tải lên: 08/03/2014, 08:20

... 20min timeline. For acetonitrile and chloroform, the re- sponse is not reversible therefore the same sensor could not be tested but the reproducibility of the response in different sensors was good ... laude” for his research work. Marc Christo- phersen is a co-author of over 40 publications in scientific journals and holds three German patents for semiconductor structuring. He worked...

Ngày tải lên: 16/03/2014, 15:23

... values (TLV) for NO 2 and NO are 3 and 25 ppm, respectively [5]. Therefore, a NO x sensor requires high sensitivity for detecting low concentration of gases. Another enormous driving force for developing ... report, for the ®rst time, that Ag promotion can also enhance WO 3 sensitivity signi®cantly. In addition, this promotion decreases the optimum sensor temperature of 300 8C fo...

Ngày tải lên: 19/03/2014, 16:47

... sources of ammonia include fertilizers, soils and production of chemicals, etc. The importance of the detec- tion of these gases is evident. There are needs for nitrogen dioxide and ammonia sensors ... gas-sensing characteristics of PbS were investigated for the nee d to develop sensitive, reliable and low cost sensors for toxic gases. Novel gas sensors were fabricated based on a si...

Ngày tải lên: 20/03/2014, 13:06

... pulled forward. To turn stFRET from a strain sensor into a stress sensor, we need to measure its force–distance properties. At the current time, we only have estimates from pub- lished atomic force ... adjusted to 30 °C for overnight expression. The cells were harvested by centri- fugation at 4000 g for 10 min at 4 °C. The pellets were stored at )20 °C for later use, or used immediat...

Ngày tải lên: 30/03/2014, 04:20

... perfor- mance gain over B-MAC. C-MAC outperforms B-MAC even when there is only one link. C-MAC performs one traffic snoop- ing and RTS/CTS exchange for a block of packets while a CCA is needed for ... employ per-packet handshakes for collision avoidance. Although such a strategy is effective for high-rate radios (like 802.11 radios), it will incur significant overhead for low-rate rad...

Ngày tải lên: 01/09/2013, 15:23

... point forward for the life of the sensor network. To put the energy requirements into perspective, suppose that a sensor network using our security protocol were to maintain its peak rate for a ... futuristic scenario that include sensors that test for nitrates (explosives), chemical toxins, biological toxins and radiation. For example, sensors testing for motion and sound would...

Ngày tải lên: 14/02/2014, 16:20