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iron oxide-chitosan nanobiocomposite for urea sensor
iron oxide-chitosan nanobiocomposite for urea sensor
... utilized for estimation of urea in serumsamples and to develop other biosensors. Besides this, effortsshould be made to utilize these materials for in vivo sens-ing.A. Kaushik et al. / Sensors ... films for application to urea biosensor, Biosens. Bioelectron. 17 (2002) 697–703.[3] Rajesh, V. Bisht, W. Takashima, K. Kaneto, An amperometric urea biosensorbased on covalent immobilization of urease ... entrapmentmatrices for urease biosensor development, Sens. Actuators B, Chem. 123(2007) 671–679.[7] P.R. Solanki, A. Kaushik, A.A. Anees, G. Sumana, B.D. Malhotra, Zinc oxide-chitosan nanobiocomposite for urea...
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C-MAC: Model-driven Concurrent Medium AccessControl for Wireless Sensor Networks
... perfor-mance gain over B-MAC. C-MAC outperforms B-MAC evenwhen there is only one link. C-MAC performs one traffic snoop-ing and RTS/CTS exchange for a block of packets while a CCAis needed for ... Bu,vare two time-varying constants dependenton environment.(a) Office (b) Corridor (c) Grass field (d) Parking lotFig. 2. Four environments used for measurements.To evaluate the accuracy of the ... experiment isrepeated for 10 runs. The variance is in a very small range andthe degree is related to the environment.Figure 3 shows RSS versus transmit power in differentenvironments. Several...
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A Survey on Network Security and Attack Defense Mechanism For Wireless Sensor Networks pdf
... demanding deployment environments of wireless sensor networks make security for these systems more challenging than for conventional networks. However, several properties of sensor networks may ... proposed security mechanisms for wireless sensor networks. Keywords: Wireless Sensor Networks (WSNs), Security, Threats, Attacks, I. INTRODUCTION Wireless sensor network (WSN) is a heterogeneous ... to implement strong security algorithms on a sensor platform due to their complexity. In addition, large numbers of sensor nodes pose the demand for simple, flexible, and scalable security protocols....
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Surface modified silicon nano channel for urea sensing
... 2008Keywords:Nano-channel Urea BiosensorLithographyabstractSilicon nano-channels have been surface functionalized with the enzymeurease for biosensor applicationsto detect and quantify urea concentration. ... (ENFET),which is a pH-based ISFET has been developed [8,9]. Glucosesensors, and urea sensors are among the best-known biosensors for widespread clinical applications. Traditional enzyme-linkedimmunosorbent ... wire FET sensor is modified with urease follow-ing procedure below. Before modification, the Al2O3surface wastreated with oxygen plasma [14] (50 mW power, 30 sccm flow rate for 1 min) for two...
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aluminum-doped tio2 nano-powders for gas sensors
... (TiO2)-based gas sensorsshow good sensitivity and stability in adverse environments andhave the potential to become the material of choice for high tem-perature gas sensors [2,3].TiO2forms three ... 600–900◦C[19]. Since ionic radii for Al and Ti are close to each other(0.074 nm for Ti4+and 0.0675 nm for Al3+) [20], Al can occupya regular cation position, forming a substitutional solid ... environments, but has no effect on phaseformation. In all cases, anatase phase is formed with or withoutAl dopants. Due to similar ionic radii, it is hypothesized that Alwill substitute for...
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comparative study of nanocrystalline sno2 materials for gas sensor application
... to form printable ink. Theink was deposited on sensor microheater platform, dried for 15 minat 150◦C and annealed at 700◦C for 15 min to reach the stabilizationof the material.The sensor ... could be an evidence for highoxidation ability of material at elevated temperatures.3.2. Sensor characterizationLong-term stability measurements were performed for 590 h.All sensors underwent ... of thick film materials for tin dioxide based gas sensors enabled the fabrication of sensitiveand relatively selective gas sensors. However, long-term stabilityof the sensors remains an important...
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new technology of metal oxide thin film preparation for chemical sensor application
... Sensors and Actuators B 109 (2005) 128–134New technology of metal oxide thin filmpreparation for chemical sensor applicationViacheslav Khatkoa,∗, ... new way to preparegas sensors has appeared.This way is connected with the attempt to find methods thatincreasethe surfacearea ofactivelayersfor chemicalsensing.Since the sensor sensitivity is ... dramaticinfluenceon sensorperformance.∗Corresponding author. Tel.: +34 977558653; fax: +34 977559605.E-mail address: vkhatko@etse.urv.es (V. Khatko).Many different nano-sized powders and technologies for the...
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Event-Based Motion Control for Mobile- Sensor Networks ppt
... bestperformance because each sensor knowsexactly what area it should consider for coverage. If any part of the sensor sVoronoi region is farther away than Rs,the sensor knows that no other sensor ... histogram,although the sensors don’t represent thehistogram explicitly. Instead, each sensor keeps two sets of CDFs, one set for eachaxis. That is, for each row or column ofthe 2D histogram, the sensor maintains ... each sensor has a lim-ited communication and sensing range,and at least one sensor should senseevery point in the environment. Every sensor moves to maintain coverage, or, ifnot required for...
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FED: FUZZY EVENT DETECTION MODEL FOR WIRELESS SENSOR NETWORKS pptx
... are distributed in the environment uniformly random. We use three types of sensors(SensorType1, SensorType2 and SensorType3) with equal quantities. In each experiment a sensor field is generatedwith ... algorithm for highly uniform cluster formation,” in European Workshop on Wireless SensorNetworks (EWSN 2004), Jan. 2004. [30] S. Soro and W. B. Heinzelman, “Cluster head election techniques for coverage ... different sensor types to uncover composite events using heterogeneoussensor nodes. The main reasons for applying heterogeneous sensor nodes are hardware constraints and energyconsiderations. Therefore,...
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Springer Verlag Soft Sensors for Monitoring P1
... Structure for the Soft Sensor 117 6.4 The One-step-ahead Predictor Soft Sensor 127 6.4.1 Refinement of the One-step-ahead Soft Sensor 134 6.5 Conclusions 142 7 Strategies to Improve Soft Sensor ... soft sensor design phase), which can be detected by critically analyzing system inputs. This analysis should be constantly performed by checking for violation of suitable thresholds imposed for ... Soft Sensors for Monitoring and Control of Industrial Processes 2.2.3 Real-time Estimation for Monitoring and Control The real-time estimation of system variables obtained using soft sensors,...
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