scholarly journals Fusão Hierárquica de Dados para Sistemas de Computação em Névoa

2020 ◽  
Author(s):  
Sandy Ferreira Bezerra ◽  
Matheus Gomes Cordeiro ◽  
Atslands Rocha ◽  
Flavia Delicato
Keyword(s):  
No Sensor

O paradigma da computação em névoa possibilita que os recursos computacionais sejam levados para a borda da rede, de forma que a latência e a largura de banda resultantes da computação em nuvem possam ser reduzidas. A combinação desse paradigma com técnicas de fusão de dados e processamento de eventos, a partir da aquisição de dados brutos, tem grande potencial de uso para gerar conhecimento de valor e ajudar a tomada de decisão em sistemas de IoT. Nesse contexto, foi proposta uma arquitetura de fusão de dados em três níveis (nó sensor, névoa e nuvem) que, aliada ao uso de técnicas de processamento de eventos complexos, promove a tomada de decisões com rapidez, enquanto reduz o custo de transmissão de dados na rede. Os experimentos mostram uma redução de 77% no tempo médio de envio de mensagens na rede e 82% de melhoria na vazão média com a utilização da arquitetura proposta.

The accuracy and precision of interface pressure measuring devices: A systematic review

2021 ◽  
pp. 026835552110080
Author(s):  
Orsolya Kokai ◽  
Sharon L Kilbreath ◽  
Patrick McLaughlin ◽  
Elizabeth S Dylke
Keyword(s):  
Systematic Review ◽  
Applied Pressure ◽  
Calibration Method ◽  
Interface Pressure ◽  
Measuring Devices ◽  
Pressure Application ◽  
Accuracy And Precision ◽  
Major Factors ◽  
No Sensor

Introduction Interface pressure measuring devices are used to assess the pressures exerted by compression. Their performance, however, has not been considered as a contributing factor to reported inconsistences in the application of compression. A systematic review was undertaken to investigate the performance of commercially available devices used to measure interface pressure. Methods Six databases were searched identifying 17 devices, grouped into five sensor categories. Results A range of methodologies assessed the devices’ accuracy and precision, including method of pressure application, device calibration and type of surface used. No sensor category outperformed the others, however some individual sensors showed higher accuracy and/or precision compared to others. Two major factors influenced the performance of a number of sensors: the amount of applied pressure and the calibration method used. Conclusion Inconsistences in the application of compression may reflect, in part, issues related to accuracy and precision of the devices used to assess compression.

Effects of Ni addition on the response of La2CuO4 sensing electrode for NO sensor

2017 ◽  
Vol 252 ◽  
pp. 37-43 ◽  
Author(s):  
Bing Wang ◽  
Yu Yuan ◽  
Chao Wang ◽  
Jinqiang Huang ◽  
Xiangdong Li ◽  
...  
Keyword(s):  
Ni Addition ◽  
No Sensor

scholarly journals Structural basis of thiol-based regulation of formaldehyde detoxification inH. influenzaeby a MerR regulator with no sensor region

2016 ◽  
Vol 44 (14) ◽  
pp. 6981-6993 ◽  
Author(s):  
Rafael M. Couñago ◽  
Nathan H. Chen ◽  
Chiung-Wen Chang ◽  
Karrera Y. Djoko ◽  
Alastair G. McEwan ◽  
...  
Keyword(s):  
Structural Basis ◽  
No Sensor ◽  
Sensor Region

Miniature Chemiluminescence NO Sensor Based on PIN Photodiode

2019 ◽  
Vol 39 (5) ◽  
pp. 0523001
Author(s):  
李杭 Li Hang ◽  
刘文清 Liu Wenqing ◽  
姚路 Yao Lu
Keyword(s):  
Pin Photodiode ◽  
No Sensor

scholarly journals Improving the Strapdown Airborne Vector Gravimetry by a Backward Inertial Navigation Algorithm

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4432
Author(s):  
Minghao Wang ◽  
Juliang Cao ◽  
Shaokun Cai ◽  
Meiping Wu ◽  
Kaidong Zhang ◽  
...  
Keyword(s):  
Field Data ◽  
Flight Test ◽  
Attitude Measurement ◽  
Integrated Navigation ◽  
Accuracy Improvement ◽  
Forward Algorithm ◽  
Navigation Algorithm ◽  
Improvement Method ◽  
Vector Gravimetry ◽  
No Sensor

Strapdown airborne gravimetry is an efficient way to obtain gravity field data. A new method has been developed to improve the accuracy of airborne vector gravimetry. The method introduces a backward strapdown navigation algorithm into the strapdown gravimetry, which is the reverse process of forward algorithm. Compared with the forward algorithm, the backward algorithm has the same performance in the condition of no sensor error, but has different error characteristics in actual conditions. The differences of the two algorithms in the strapdown gravimetry data processing are presented by simulations, which show that the two algorithms have different performance in the horizontal attitude measurement and convergence of integrated navigation filter. On the basis of detailed analysis, the procedures of accuracy improvement method are presented. The result of this method is very promising when applying to an actual flight test carried out by a SGA-WZ02 strapdown gravimeter. After applying the proposed method, the repeatability of two gravity disturbance horizontal components were 1.83 mGal and 1.80 mGal under the resolution of 6 km, which validate the effectiveness of the method. Furthermore, the wavenumber correlation filter is also discussed as an alternative data fusion method.

Zeolite Sensor for Nitrogen Monoxide Detection at High Temperature

1996 ◽  
Vol 454 ◽  
Author(s):  
Hiroshi Tsuchiya ◽  
Isao Sasaki ◽  
Azuchi Harano ◽  
Tatsuya Okubo ◽  
Masayoshi Sadakata
Keyword(s):  
High Temperature ◽  
Gold Electrode ◽  
Gas Sensing ◽  
Nitrogen Monoxide ◽  
X Ray Diffraction ◽  
Zeolite Film ◽  
And Performance ◽  
Flowing Stream ◽  
No Sensor ◽  
Thermal Stability Of

ABSTRACTDevelopment of new NOx sensors, which would be sensitive, selective, inexpensive and stable at elevated temperature, will greatly contribute to the reduction of the air pollution. In this paper, synthesis and performance of zeolite film applied for gas sensing are reported.Zeolite thin films (Cu ion-exchanged ZSM-5) were synthesized on the gold electrode of AT-cut quartz platelet by hydrothermal synthesis. In order to probe the target molecule (NO) selectively, Na in as synthesized ZSM-5 film was ion-exchanged with Cu. The films were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The synthesis condition for orientation to (0×0) face, on which the straight pores of ZSM-5 are opening, was optimized.The bulk type quartz oscillator coated with Cu-ZSM-5 thin layer was tested as NO sensor in a flowing stream of He. This sensing system could be operated at high temperature because of the thermal stability of the ZSM-5 film and the gold electrode. As a result, NO was successfully detected at 348 K.

scholarly journals Newly Identified NO‐Sensor Guanylyl Cyclase/Connexin 43 Association Is Involved in Cardiac Electrical Function

2017 ◽  
Vol 6 (12) ◽  
Author(s):  
Pierre‐Antoine Crassous ◽  
Ping Shu ◽  
Can Huang ◽  
Richard Gordan ◽  
Peter Brouckaert ◽  
...  
Keyword(s):  
Guanylyl Cyclase ◽  
Connexin 43 ◽  
No Sensor

Diode-Laser-Based Sensor Measurements of Nitric Oxide and Carbon Monoxide in Combustion Exhaust Streams

2003 ◽  
Author(s):  
Thomas N. Anderson ◽  
Rodolfo Barron-Jimenez ◽  
Jerald A. Caton ◽  
Robert P. Lucht ◽  
Sukesh Roy ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Carbon Monoxide ◽  
Detection Limit ◽  
Diode Laser ◽  
Path Length ◽  
Barium Borate ◽  
Co Sensor ◽  
No Sensor ◽  
Absorption Measurements ◽  
Frequency Mixing

All-solid-state continuous-wave (cw) laser systems for ultraviolet (UV) absorption measurements of the nitric oxide (NO) molecule and mid-infrared (IR) absorption measurements of carbon monoxide (CO) were developed and demonstrated. For the NO sensor, 250 nW of tunable cw UV radiation at 226.8 nm is produced by sum-frequency-mixing in a beta-barium borate crystal. For the CO sensor, 2μW of tunable cw IR radiation at 4.5 μm is produced by difference-frequency mixing in a periodically-poled lithium niobate crystal. A tunable external-cavity diode laser (ECDL) provides one of the fundamental beams for both processes so that the wavelength of the generated UV/IR can be tuned over NO/CO absorption lines to produce a fully resolved absorption spectrum. The sensors were used for measurements in the exhaust stream of an operating auxiliary power unit (APU) gas turbine engine and a well-stirred reactor (WSR). During these tests, NO was measured in the exhaust at levels below 10 ppm. For measurements at levels above 20 ppm, the NO emission levels obtained using the new sensor agreed with the results of probe sampling chemiluminescent analyzer results to within 10%. A detection limit of 0.8 ppm of per meter path length at 1000 K is estimated for the NO sensor. Measurements with the CO sensor demonstrated an agreement with extractive probe sampling to within 15%. The estimated detection limit of the CO sensor is a few ppm per meter path length at 1000 K.

A selective NO sensor based on the semiconducting BC2N nanotubes: a computational study

2020 ◽  
Vol 118 (24) ◽  
pp. e1798528
Author(s):  
Yongqiu Liu ◽  
Chao Liu ◽  
Ajit Kumar
Keyword(s):  
Computational Study ◽  
Bc2n Nanotubes ◽  
No Sensor
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