scholarly journals A microgripper sensor device capable of detecting ion efflux from whole cells

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 50536-50541 ◽  
Author(s):  
R. Daunton ◽  
D. Wood ◽  
A. J. Gallant ◽  
R. Kataky
Keyword(s):  
Live Cells ◽  
Whole Cells ◽  
Ion Sensing ◽  
Sensor Device ◽  
Sensor Devices ◽  
Ion Efflux

Electrothermally actuated microgripper sensor devices that are capable of simultaneous manipulation and ion sensing of live cells.

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).

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.

scholarly journals High Response of Ethanol Gas Sensor Based on NiO-Doped Apple Pectin by the Solution Process

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1073
Author(s):  
Jia-Cheng Jian ◽  
Yu-Chi Chang ◽  
Sheng-Po Chang ◽  
Shoou-Jinn Chang
Keyword(s):  
Gas Sensor ◽  
Solution Process ◽  
Processing Technique ◽  
Maximum Efficiency ◽  
Apple Pectin ◽  
Film Sensor ◽  
Sensor Device ◽  
Operational Temperature ◽  
Sensor Devices ◽  
First Time

Novel gas sensor devices, based on biomaterial apple pectin film (APN) doped with NiO, were fabricated for the first time using a solution processing technique. The device was then annealed in a microwave chamber. The structural, elemental, and surface morphology of the device was investigated, using TEM, XPS, and AFM, respectively. The as-fabricated film sensor possessed a superior sensing performance regarding ethanol gas, compared to the pure apple pectin film sensor. The response of the device was recorded at a maximum efficiency of 161. For a 10 ppm concentration of ethanol gas at an operational temperature of 250 °C, the response time was 1.379 s. Nevertheless, the sensing mechanism for the sensor device is also described thoroughly.

scholarly journals PROCESS TECHNOLOGY OF FABRICATION NO2 GAS SENSOR DEVICES WITH ACTIVE LAYER In2O3

2016 ◽  
Vol 10 (1) ◽  
pp. 69
Author(s):  
Slamet Widodo
Keyword(s):  
Metal Oxide ◽  
Aluminum Oxide ◽  
Gas Sensor ◽  
Heat Distribution ◽  
Process Technology ◽  
Sensitive Layer ◽  
Resistance Change ◽  
No2 Gas Sensor ◽  
Sensor Device ◽  
Sensor Devices

This paper discuss the design and fabrication of NO<sub>2 </sub>gas sensor based on metal oxide using thick film technology was described. The design of gas sensor is consisted of components, i.e. heater, electrode (interdigital fingers) and sensitive layer from In<sub>2</sub>O<sub>3</sub> material. This sensor has been designed as multilayers with heater and both electrodes in one surface, in accordance with miniaturisation aspect, heat distribution and less consumption of energy from the sensor device. The heater and electrode were fabricated on alumina substrate (aluminum oxide/Al<sub>2</sub>O<sub>3</sub>) with silver paste. The In<sub>2</sub>O<sub>3 </sub>layer provides\ resistance change when it is exposed by NO<sub>2</sub> gas. It indicates that this sensor device has a potency to be used as NO<sub>2 </sub>detector.

scholarly journals PROCESS TECHNOLOGY OF FABRICATION NO2 GAS SENSOR DEVICES WITH ACTIVE LAYER In2O3

2018 ◽  
Vol 10 (1) ◽  
pp. 69
Author(s):  
Slamet Widodo
Keyword(s):  
Metal Oxide ◽  
Aluminum Oxide ◽  
Gas Sensor ◽  
Heat Distribution ◽  
Process Technology ◽  
Sensitive Layer ◽  
Resistance Change ◽  
No2 Gas Sensor ◽  
Sensor Device ◽  
Sensor Devices

This paper discuss the design and fabrication of NO<sub>2 </sub>gas sensor based on metal oxide using thick film technology was described. The design of gas sensor is consisted of components, i.e. heater, electrode (interdigital fingers) and sensitive layer from In<sub>2</sub>O<sub>3</sub> material. This sensor has been designed as multilayers with heater and both electrodes in one surface, in accordance with miniaturisation aspect, heat distribution and less consumption of energy from the sensor device. The heater and electrode were fabricated on alumina substrate (aluminum oxide/Al<sub>2</sub>O<sub>3</sub>) with silver paste. The In<sub>2</sub>O<sub>3 </sub>layer provides\ resistance change when it is exposed by NO<sub>2</sub> gas. It indicates that this sensor device has a potency to be used as NO<sub>2 </sub>detector.

scholarly journals Wavelength-Selective Activation of Photocaged DNAzymes for Metal Ion Sensing in Live Cells

ACS Omega ◽  
2021 ◽  
Author(s):  
Xiao Xu ◽  
Lu Xiao ◽  
Chunmei Gu ◽  
Jiachen Shang ◽  
Yu Xiang
Keyword(s):  
Metal Ion ◽  
Live Cells ◽  
Selective Activation ◽  
Ion Sensing ◽  
Metal Ion Sensing

scholarly journals A novel approach for identification of sensor devices through Acoustic PUF

2021 ◽  
Author(s):  
Girish Vaidya ◽  
Prabhakar T.V. ◽  
Nithish Gnani ◽  
Ryan Shah ◽  
Shishir Nagaraja
Keyword(s):  
Supply Chain ◽  
Numerical Analysis ◽  
Experimental Evaluation ◽  
Sensor Node ◽  
Sensor Nodes ◽  
Production Facility ◽  
Sensor Device ◽  
Novel Approach ◽  
Sensor Devices ◽  
Manufacturing Tolerances

The supply chain traceability of components from a production facility to deployment and maintenance depends upon its irrefutable identity. There are two well-known methods for identification which includes an identity code stored in the memory and embedding a custom identification hardware. While storing the identity code is susceptible to malicious and unintentional attacks, the approach of embedding a custom identification hardware is infeasible for sensor nodes assembled with Commercially-Off-the-Shelf (COTS) devices. We propose a novel identifier - Acoustic PUF based on the innate properties of the sensor node. Acoustic PUF combines the uniqueness component and the position component of the sensor device signature. The uniqueness component is derived by exploiting the manufacturing tolerances, thus making the signature unclonable. The position component is derived through acoustic fingerprinting, thus giving a sticky identity to the sensor device. We evaluate Acoustic PUF for Uniqueness, Repeatability and Position identity with a deployment spanning several weeks. Through our experimental evaluation and further numerical analysis, we prove that Acoustic PUF can uniquely identify thousands of devices with 99% accuracy while simultaneously detecting the change in position.

scholarly journals Direct measurement of K+ ion efflux from neuronal cells using a graphene-based ion sensitive field effect transistor

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 37728-37734
Author(s):  
Hongmei Li ◽  
Kenneth B Walsh ◽  
Ferhat Bayram ◽  
Goutam Koley
Keyword(s):  
Direct Measurement ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Neuronal Cells ◽  
High Sensitivity ◽  
Live Cells ◽  
Ion Efflux ◽  
Effect Transistor

A graphene-based ISFET has been developed and demonstrated high sensitivity and direct measurement of K+ ion efflux from live cells.

scholarly journals Using spectral decomposition of the signals from laurdan-derived probes to evaluate the physical state of membranes in live cells

F1000Research ◽  
2017 ◽  
Vol 6 ◽  
pp. 763 ◽  
Author(s):  
Serge Mazeres ◽  
Farzad Fereidouni ◽  
Etienne Joly
Keyword(s):  
Spectral Decomposition ◽  
Mammalian Cells ◽  
Lipid Droplets ◽  
Physical State ◽  
The Other ◽  
Live Cells ◽  
Whole Cells ◽  
Mammalian Cell Lines ◽  
Other Hand ◽  
Liquid Ordered

Background: We wanted to investigate the physical state of biological membranes in live cells under the most physiological conditions possible. Methods: For this we have been using laurdan, C-laurdan or M-laurdan to label a variety of cells, and a biphoton microscope equipped with both a thermostatic chamber and a spectral analyser. We also used a flow cytometer to quantify the 450/530 nm ratio of fluorescence emissions by whole cells. Results: We find that using all the information provided by spectral analysis to perform spectral decomposition dramatically improves the imaging resolution compared to using just two channels, as commonly used to calculate generalized polarisation (GP). Coupled to a new plugin called Fraction Mapper, developed to represent the fraction of light intensity in the first component in a stack of two images, we obtain very clear pictures of both the intra-cellular distribution of the probes, and the polarity of the cellular environments where the lipid probes are localised. Our results lead us to conclude that, in live cells kept at 37°C, laurdan, and M-laurdan to a lesser extent, have a strong tendency to accumulate in the very apolar environment of intra-cytoplasmic lipid droplets, but label the plasma membrane (PM) of mammalian cells ineffectively. On the other hand, C-laurdan labels the PM very quickly and effectively, and does not detectably accumulate in lipid droplets. Conclusions: From using these probes on a variety of mammalian cell lines, as well as on cells from Drosophila and Dictyostelium discoideum, we conclude that, apart from the lipid droplets, which are very apolar, probes in intracellular membranes reveal a relatively polar and hydrated environment, suggesting a very marked dominance of liquid disordered states. PMs, on the other hand, are much more apolar, suggesting a strong dominance of liquid ordered state, which fits with their high sterol contents.

Sign in / Sign up

Export Citation Format

Share Document