Sol-Gel Processed Alumina based Materials in Microcalorimeter Sensor Device Fabrication for Automotive Applications

1996 ◽  
Vol 431 ◽  
Author(s):  
S. R. Nakouzi ◽  
J. R. McBride ◽  
K. E. Nietering ◽  
C. K. Narula
Keyword(s):  
Sol Gel ◽  
Device Fabrication ◽  
Automotive Applications ◽  
Automotive Exhaust ◽  
Exhaust Gases ◽  
Sensor Device ◽  
Sensor Devices

AbstractThe application of sol-gel processed materials in a variety of sensors has been proposed. We describe microcalorimeter sensor devices employing sol-gel processed alumina based materials which can be used to monitor pollutants in automotive exhaust. These sensors operate by measuring changes in resistance upon catalysis and are economically acceptable for automotive applications. It is important to point out that automobiles will be required to have a means of monitoring exhaust gases by on-board sensors as mandated by the EPA and the California Air Resources Board (OBD-II).

Sol–gel magnetite inks for inkjet printing

2019 ◽  
Vol 7 (21) ◽  
pp. 6426-6432 ◽  
Author(s):  
Denis S. Kolchanov ◽  
Vladislav Slabov ◽  
Kirill Keller ◽  
Ekaterina Sergeeva ◽  
Mikhail V. Zhukov ◽  
...  
Keyword(s):  
Inkjet Printing ◽  
Sol Gel ◽  
Device Fabrication ◽  
Magnetic Device ◽  
Magnetic Structures

The article describes an easy-to-implement and print-ready composition for inkjet printing of magnetic structures, which can be used for security printing, coding, and marking, magnetic device fabrication or creation of micro-antennas.

Sol-Gel Process form Heterometallic Alkoxides to Incorporate Alkaline- and Rare Earths in Alumina for automotive Applications

1996 ◽  
Vol 431 ◽  
Author(s):  
C. K. Narula
Keyword(s):  
Elevated Temperatures ◽  
Sol Gel ◽  
Automotive Applications ◽  
Automotive Catalysts ◽  
Heterometallic Alkoxides ◽  
Sol Gel Process ◽  
Alkaline Earths ◽  
Cost Of Materials ◽  
Gel Processing

AbstractThe high cost of materials prepared by sol-gel processing and the loss of useful surface properties at elevated temperature has prevented the application of sol-gel processed materials in automotive exhaust reduction catalyst formulations. In this report, we briefly describe the important developments needed in the next generation automotive catalysts and the role of sol-gel processed materials. We will also discuss the application of heterometallic alkoxides as sol-gel precursors to achieve the molecular distribution of lanthanides and alkaline earths in alumina matrices needed for the stabilization of alumina based materials at elevated temperatures.

pH Measurement Using Titanium Dioxide Nanoparticles Thin Film Based Sensors

2015 ◽  
Vol 754-755 ◽  
pp. 1120-1125 ◽  
Author(s):  
A.Y.P. Puah ◽  
Sharipah Nadzirah ◽  
Mohd Khairuddin Md Arshad ◽  
R.M. Ayub ◽  
A. Rahim Ruslinda ◽  
...  
Keyword(s):  
Thin Film ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Electrical Characterization ◽  
The Other ◽  
Gap Size ◽  
Sensitivity Measurement ◽  
Ph Values ◽  
Sensor Device ◽  
Sensitive Sensor

Optimization gap size and integration of TiO2nanoparticles thin film produce a sensitive sensor device. Sol-gel spin coated TiO2nanoparticles thin film is coated on a conventional fabricated IDEs with gap sizes of 7 μm, 10 μm, 14 μm and 17 μm which is then validated through electrical characterization. I-V characteristics of without and with TiO2thin film of various gap sizes are subjected to pH test are then plotted to describe the resistance of the devices and correlate with the sensitivity measurement. Sensing devices show that devices with larger spacing and greater pH values have higher current. On the other hand, integration of TiO2thin film reduced the resistance of devices. Among the four gap sizes, 7 μm gap sized device is the most sensitive one due to the tremendous difference after small amount of pH dropped on surface, thus lowering the detection limit.

scholarly journals Energy Efficient MAC Scheme for Wireless Sensor Networks with High-Dimensional Data Aggregate

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Seokhoon Kim ◽  
Hangki Joh ◽  
Seungjun Choi ◽  
Intae Ryoo
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
High Dimensional Data ◽  
Wireless Sensor ◽  
High Dimensional ◽  
Sink Node ◽  
Group Management ◽  
Mac Scheme ◽  
Sensor Device ◽  
Sensor Devices

This paper presents a novel and sustainable medium access control (MAC) scheme for wireless sensor network (WSN) systems that process high-dimensional aggregated data. Based on a preamble signal and buffer threshold analysis, it maximizes the energy efficiency of the wireless sensor devices which have limited energy resources. The proposed group management MAC (GM-MAC) approach not only sets the buffer threshold value of a sensor device to be reciprocal to the preamble signal but also sets a transmittable group value to each sensor device by using the preamble signal of the sink node. The primary difference between the previous and the proposed approach is that existing state-of-the-art schemes use duty cycle and sleep mode to save energy consumption of individual sensor devices, whereas the proposed scheme employs the group management MAC scheme for sensor devices to maximize the overall energy efficiency of the whole WSN systems by minimizing the energy consumption of sensor devices located near the sink node. Performance evaluations show that the proposed scheme outperforms the previous schemes in terms of active time of sensor devices, transmission delay, control overhead, and energy consumption. Therefore, the proposed scheme is suitable for sensor devices in a variety of wireless sensor networking environments with high-dimensional data aggregate.

scholarly journals Dynamic Speed Control of Unmanned Aerial Vehicles for Data Collection under Internet of Things

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3951 ◽  
Author(s):  
Qi Pan ◽  
Xiangming Wen ◽  
Zhaoming Lu ◽  
Linpei Li ◽  
Wenpeng Jing
Keyword(s):  
Data Collection ◽  
Internet Of Things ◽  
Unmanned Aerial Vehicles ◽  
Collection Efficiency ◽  
Speed Control ◽  
Analytical Models ◽  
Typical Application ◽  
Aerial Vehicles ◽  
Sensor Device ◽  
Sensor Devices

With the new advancements in flight control and integrated circuit (IC) technology, unmanned aerial vehicles (UAVs) have been widely used in various applications. One of the typical application scenarios is data collection for large-scale and remote sensor devices in the Internet of things (IoT). However, due to the characteristics of massive connections, access collisions in the MAC layer lead to high power consumption for both sensor devices and UAVs, and low efficiency for the data collection. In this paper, a dynamic speed control algorithm for UAVs (DSC-UAV) is proposed to maximize the data collection efficiency, while alleviating the access congestion for the UAV-based base stations. With a cellular network considered for support of the communication between sensor devices and drones, the connection establishment process was analyzed and modeled in detail. In addition, the data collection efficiency is also defined and derived. Based on the analytical models, optimal speed under different sensor device densities is obtained and verified. UAVs can dynamically adjust the speed according to the sensor device density under their coverages to keep high data collection efficiency. Finally, simulation results are also conducted to verify the accuracy of the proposed analytical models and show that the DSC-UAV outperforms others with the highest data collection efficiency, while maintaining a high successful access probability, low average access delay, low block probability, and low collision probability.

Integrated Piezoelectric and Pyroelectric Devices from Thin Film Ferroelectrics

1991 ◽  
Vol 243 ◽  
Author(s):  
M. Sayer ◽  
C.V.R. Vasant Kumar ◽  
D. Barrow ◽  
Li Zou ◽  
D.T. Amm
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Device Fabrication ◽  
Operating Conditions ◽  
Design Criteria ◽  
Silicon Substrates ◽  
Pzt Films ◽  
The Stability ◽  
Processing Techniques ◽  
Pyroelectric Characteristics

AbstractThin PZT films 1-4 μm in thickness prepared by sputtering or sol gel methods allow PZT films to be integrated with silicon technology to achieve piezoelectric or pyroelectric structures having small size or mass. Design criteria, materials and processing techniques for such devices are discussed, and the implementation of small size devices on silicon substrates is demonstrated. Factors of importance are the piezoelectric and pyroelectric characteristics achievable in the films, mechanical strength and fatigue, and the stability and compatibility of the films and electrodes with device fabrication procedures and operating conditions.

Chromophore Dynamics in Sol-Gel Glasses and Xerogel Clad Fiber Optic Sensors

1994 ◽  
Vol 346 ◽  
Author(s):  
Drew L'Esperance ◽  
Clarice A. Browne ◽  
Eric L. Chronister
Keyword(s):  
Energy Transfer ◽  
Fiber Optic ◽  
Rotational Diffusion ◽  
Sol Gel ◽  
Fiber Optic Sensors ◽  
Fiber Optic Sensor ◽  
Time Resolved ◽  
Optic Sensor ◽  
Sensor Device ◽  
Gel Glasses

ABSTRACTTime-resolved depolarization measurements are used to investigate rotational diffusion and optical energy transfer dynamics of chromophores incorporated into silica and aluminosilica solutions, gels, and glasses. The use of an organically doped sol-gel clad waveguide as a novel intrinsic fiber optic sensor device is also demonstrated, and advantages of time-resolved detection of the fiber optic sensor are illustrated.

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