Graphene Hybrid Architectures for Chemical Sensors

2016 ◽  
pp. 259-285
Author(s):  
Parikshit Sahatiya ◽  
Sushmee Badhulika
Keyword(s):  
Chemical Sensors ◽  
Hybrid Architectures

Comparison of two devices for measuring exercise transcutaneous oxygen pressures in patients with claudication

VASA ◽  
2015 ◽  
Vol 44 (5) ◽  
pp. 355-362 ◽  
Author(s):  
Marie Urban ◽  
Alban Fouasson-Chailloux ◽  
Isabelle Signolet ◽  
Christophe Colas Ribas ◽  
Mathieu Feuilloy ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Transcutaneous Oxygen ◽  
Starting Values ◽  
Two Systems ◽  
Transcutaneous Oxygen Pressure ◽  
New Sensors ◽  
Changes Over Time ◽  
Over Time

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

scholarly journals Transitioning Broadcast to Cloud

2021 ◽  
Vol 11 (2) ◽  
pp. 503
Author(s):  
Yuriy Reznik ◽  
Jordi Cenzano ◽  
Bo Zhang
Keyword(s):  
Signal Processing ◽  
Online Video ◽  
Video Delivery ◽  
Hybrid Architectures ◽  
The Future ◽  
Media Formats

We analyze the differences between on-premise broadcast and cloud-based online video delivery workflows and identify technologies needed for bridging the gaps between them. Specifically, we note differences in ingest protocols, media formats, signal-processing chains, codec constraints, metadata, transport formats, delays, and means for implementing operations such as ad-splicing, redundancy and synchronization. To bridge the gaps, we suggest specific improvements in cloud ingest, signal processing, and transcoding stacks. Cloud playout is also identified as critically needed technology for convergence. Finally, based on all such considerations, we offer sketches of several possible hybrid architectures, with different degrees of offloading of processing in cloud, that are likely to emerge in the future.

scholarly journals Facet controlled growth mechanism of SnO2 (101) nanosheet assembled film via cold crystallization

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yoshitake Masuda
Keyword(s):  
Crystal Growth ◽  
Tin Oxide ◽  
Chemical Sensors ◽  
Seed Layer ◽  
Flat Surface ◽  
Crystallographic Analysis ◽  
Cold Crystallization ◽  
Type I ◽  
Type Ii ◽  
Oxide Substrate

AbstractCold crystallization of SnO2 was realized in aqueous solutions, where crystal growth was controlled to form SnO2 (101) nanosheet assembled films for devices such as chemical sensors. The nanosheets grew directly on a fluorine-doped tin oxide substrate without a seed layer or a buffer layer. The nanosheets had a thickness of 5–10 nm and an in-plane size of 100–1600 nm. Moreover, the large flat surface of the (101) facet was metastable. The thickness of the SnO2 (101) nanosheet assembled film was approximately 800 nm, and the film had a gradient structure that contained many connected nanosheets. TEM results revealed that the predominate branch angles between any two connected nanosheets were 90° and 46.48°, corresponding to type I and type II connections, respectively. These connections were consistent with the calculations based on crystallography. Crystallographic analysis clarified the characteristic crystal growth of the SnO2 (101) nanosheet assembled film in the aqueous solution. Furthermore, we demonstrate that the metastable (101) facet can be exploited to control the rate of crystal growth by adjusting the etching condition.

scholarly journals Advances in Self-Powered Chemical Sensing via a Triboelectric Nanogenerator

Nanoscale ◽  
2020 ◽  
Author(s):  
Congxi Huang ◽  
Guorui Chen ◽  
Ardo Nashalian ◽  
Jun Chen
Keyword(s):  
Environmental Protection ◽  
Human Body ◽  
Chemical Sensors ◽  
Chemical Sensing ◽  
Triboelectric Nanogenerator ◽  
Self Powered ◽  
Human Healthcare

Chemical sensors allow for continuous detection and analysis of underexplored molecules on the human body and the surroundings, which hold bright applications on human healthcare and environmental protection. With the...

Surface Plasmon Resonance Chemical Sensors Based on Amorphous Chalcogenide Waveguides

2020 ◽  
Vol 389 (1) ◽  
pp. 1900066
Author(s):  
Laurentiu Baschir ◽  
Aurelian A. Popescu ◽  
Dan Savastru ◽  
Sorin Miclos
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Chemical Sensors ◽  
Plasmon Resonance ◽  
Amorphous Chalcogenide
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