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Total 2011 results found since Jan 2013.

Sensors, Vol. 23, Pages 6055: ZnO-Loaded Graphene for NO2 Gas Sensing
uard Llobet This paper investigates the effect of decorating graphene with zinc oxide (ZnO) nanoparticles (NPs) for the detection of NO2. In this regard, two graphene sensors with different ZnO loadings of 5 wt.% and 20 wt.% were prepared, and their responses towards NO2 at room temperature and different conditions were compared. The experimental results demonstrate that the graphene loaded with 5 wt.% ZnO NPs (G95/5) shows better performance at detecting low concentrations of the target gas than the one loaded with 20 wt.% ZnO NPs (G80/20). Moreover, measurements under dry and humid conditions of the G95/5 sensor reve...
Source: Sensors - June 30, 2023 Category: Biotechnology Authors: Mohamed Ayoub Alouani Juan Casanova-Ch áfer Frank G üell Elisa Pe ña-Martín Sara Ruiz-Mart ínez-Alcocer Santiago de Bernardi-Mart ín Alejandra Garc ía-Gómez Xavier Vilanova Eduard Llobet Tags: Article Source Type: research

Sensors, Vol. 23, Pages 6011: Understanding the Role of M13 Bacteriophage Thin Films on a Metallic Nanostructure through a Standard and Dynamic Model
evaraj Jin-Woo Oh The dynamic and surface manipulation of the M13 bacteriophage via the meeting application demands the creation of a pathway to design efficient applications with high selectivity and responsivity rates. Here, we report the role of the M13 bacteriophage thin film layer that is deposited on an optical nanostructure involving gold nanoparticles/SiO2/Si, as well as its influence on optical and geometrical properties. The thickness of the M13 bacteriophage layer was controlled by varying either the concentration or humidity exposure levels, and optical studies were conducted. We designed a standard and d...
Source: Sensors - June 28, 2023 Category: Biotechnology Authors: Thanh Mien Nguyen Cheol Woong Choi Ji-Eun Lee Damun Heo Ye-Won Lee Sun-Hwa Gu Eun Jeong Choi Jong-Min Lee Vasanthan Devaraj Jin-Woo Oh Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5983: Radiation Source Localization Using a Model-Based Approach
mozi The procedure is practically an optimization method, during which it is assumed that the gamma dose values detected at different points above the area come from the background radiation and from a single source found in the area. Accordingly, the procedure searches within the area for a geographical coordinate for which the distance law for the spatial propagation of radiation will be true. In order to validate the procedure, we performed measurements in a test area in such a way that all parameters of the source, including its location, were well defined. However, these data were not taken into account during the...
Source: Sensors - June 27, 2023 Category: Biotechnology Authors: Andr ás Molnár Daniel Kiss Zsolt Domozi Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5968: Ratio Indexes Based on Spectral Electroencephalographic Brainwaves for Assessment of Mental Involvement: A Systematic Review
Conclusions: Standardization in the definition of these indexes is missing, both in the considered frequency bands and in the exploited electrodes. Future research may focus on the development of indexes with a unique definition to monitor and characterize mental involvement.
Source: Sensors - June 27, 2023 Category: Biotechnology Authors: Ilaria Marcantoni Raffaella Assogna Giulia Del Borrello Marina Di Stefano Martina Morano Sofia Romagnoli Chiara Leoni Giulia Bruschi Agnese Sbrollini Micaela Morettini Laura Burattini Tags: Review Source Type: research

Sensors, Vol. 23, Pages 5940: A Suboptimal Optimizing Strategy for Velocity Vector Estimation in Single-Observer Passive Localization
In this study, we introduce a novel optimization strategy, suboptimal estimation, for independently estimating the velocity vector in single-observer passive localization. The suboptimal estimation strategy converts the estimation of the velocity vector into a search for the global optimal solution by dynamically weighting multiple optimization criteria from the starting point in the solution space. Simulation verification is conducted using uniform motion and constant acceleration models. The results demonstrate that the proposed method converges faster with higher accuracy and strong robustness.
Source: Sensors - June 26, 2023 Category: Biotechnology Authors: Shuyi Gu Zhenghua Luo Yingjun Chu Yanghui Xu Junxiong Guo Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5881: Co-Design Dedicated System for Efficient Object Tracking Using Swarm Intelligence-Oriented Search Strategies
Varsha Arya The template matching technique is one of the most applied methods to find patterns in images, in which a reduced-size image, called a target, is searched within another image that represents the overall environment. In this work, template matching is used via a co-design system. A hardware coprocessor is designed for the computationally demanding step of template matching, which is the calculation of the normalized cross-correlation coefficient. This computation allows invariance in the global brightness changes in the images, but it is computationally more expensive when using images of larger dimensions,...
Source: Sensors - June 25, 2023 Category: Biotechnology Authors: Nadia Nedjah Alexandre V. Cardoso Yuri M. Tavares Luiza de Macedo Mourelle Brij Booshan Gupta Varsha Arya Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5873: Wind Turbine Condition Monitoring Using the SSA-Optimized Self-Attention BiLSTM Network and Changepoint Detection Algorithm
In this study, based on the sparrow search algorithm (SSA), bidirectional long short-term memory networks with a self-attention mechanism (SABiLSTM), and a binary segmentation changepoint detection algorithm (BinSegCPD), a condition-monitoring method (SSA-SABiLSTM-BinSegCPD, SSD) used for wind turbines is proposed. Specifically, the self-attention mechanism, which can mine the nonlinear dynamic characteristics and spatial–temporal features inherent in the SCADA time series, was introduced into a two-layer BiLSTM network to establish a normal-behavior model for wind turbine key components. Then, as a result of...
Source: Sensors - June 25, 2023 Category: Biotechnology Authors: Junshuai Yan Yongqian Liu Li Li Xiaoying Ren Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5862: Human Activity Recognition Using Hybrid Coronavirus Disease Optimization Algorithm for Internet of Medical Things
Conclusions: The results proved that the proposed approach outperforms state-of-the-art HAR techniques, achieving an average performance of 97.82% in accuracy and a reduction ratio in feature selection of 52.7%.
Source: Sensors - June 24, 2023 Category: Biotechnology Authors: Asmaa M. Khalid Doaa Sami Khafaga Eman Abdullah Aldakheel Khalid M. Hosny Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5854: A Light-Weight Artificial Neural Network for Recognition of Activities of Daily Living
dez Human activity recognition (HAR) is essential for the development of robots to assist humans in daily activities. HAR is required to be accurate, fast and suitable for low-cost wearable devices to ensure portable and safe assistance. Current computational methods can achieve accurate recognition results but tend to be computationally expensive, making them unsuitable for the development of wearable robots in terms of speed and processing power. This paper proposes a light-weight architecture for recognition of activities using five inertial measurement units and four goniometers attached to the lower limb. First, a...
Source: Sensors - June 24, 2023 Category: Biotechnology Authors: Samer A. Mohamed Uriel Martinez-Hernandez Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5839: Ion-Selective Electrodes with Solid Contact Based on Composite Materials: A Review
barczyk Potentiometric sensors are the largest and most commonly used group of electrochemical sensors. Among them, ion-selective electrodes hold a prominent place. Since the end of the last century, their re-development has been observed, which is a consequence of the introduction of solid contact constructions, i.e., electrodes without an internal electrolyte solution. Research carried out in the field of potentiometric sensors primarily focuses on developing new variants of solid contact in order to obtain devices with better analytical parameters, and at the same time cheaper and easier to use, which has been made ...
Source: Sensors - June 23, 2023 Category: Biotechnology Authors: Cecylia Wardak Karolina Pietrzak Klaudia Morawska Malgorzata Grabarczyk Tags: Review Source Type: research

Sensors, Vol. 23, Pages 5830: Channel State Information Based Indoor Fingerprinting Localization
hen Indoor localization is one of the key techniques for location-based services (LBSs), which play a significant role in applications in confined spaces, such as tunnels and mines. To achieve indoor localization in confined spaces, the channel state information (CSI) of WiFi can be selected as a feature to distinguish locations due to its fine-grained characteristics compared with the received signal strength (RSS). In this paper, two indoor localization approaches based on CSI fingerprinting were designed: amplitude-of-CSI-based indoor fingerprinting localization (AmpFi) and full-dimensional CSI-based indoor fingerpr...
Source: Sensors - June 22, 2023 Category: Biotechnology Authors: Rongjie Che Honglong Chen Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5819: A Deep Learning Model with Signal Decomposition and Informer Network for Equipment Vibration Trend Prediction
Tian Accurate equipment operation trend prediction plays an important role in ensuring the safe operation of equipment and reducing maintenance costs. Therefore, monitoring the equipment vibration and predicting the time series of the vibration trend is one of the effective means to prevent equipment failures. In order to reduce the error of equipment operation trend prediction, this paper proposes a method for equipment operation trend prediction based on a combination of signal decomposition and an Informer prediction model. Aiming at the problem of high noise in vibration signals, which makes it difficult to obtain...
Source: Sensors - June 22, 2023 Category: Biotechnology Authors: Huiyun Wang Maozu Guo Le Tian Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5814: 2-Mercaptobenzimidazole Functionalized Copper Nanoparticles Fluorescence Probe for Sensitivity and Selectivity Detection of Cys in Serum
Zhang In this paper, a 2-mercaptobenzimidazole-copper nanoparticles (MBI-CuNPs) fluorescent probe with high performance based on 2-mercaptobenzimidazole functionalized copper nanoparticles was synthesized by a hydrothermal method and used for cysteine (Cys) detection in serum. The MBI-CuNPs probe exhibits strong fluorescence emission at 415 nm under the excitation at 200 nm, which is attributed to the metal-ligand charge transfer (MLCT) transition through the coordination of an MBI ligand and monovalent copper. Furthermore, the MBI-CuNPs probe has a high quenching fluorescence response to Cys, and shows a good linearit...
Source: Sensors - June 22, 2023 Category: Biotechnology Authors: Jing Liu Xiaozong Dou Hongyan Zhang Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5791: Relay Selection for Dual-Hop Cooperative Ambient Backscatter Communication Systems
Wang Previous works only focus on the optimization design for the dual-hop cooperative ambient backscatter communication (AmBC) system with single-relay selection. The impact of relay selection on the outage performance of dual-hop cooperative AmBC systems is still missing. Motivated by this, in this paper, we investigate the outage performance of a dual-hop cooperative AmBC system with single-relay selection, where the backscatter link shares the receiver with the cellular link and the harmful direct-link interference (DLI) is mitigated by using successive interference cancellation (SIC). In the system considered, th...
Source: Sensors - June 21, 2023 Category: Biotechnology Authors: Ping Yang Weichao Kuang Shanjin Wang Tags: Article Source Type: research

Sensors, Vol. 23, Pages 5779: A Multi-Target Localization and Vital Sign Detection Method Using Ultra-Wide Band Radar
Xinlei Jia Life detection technology using ultra-wideband (UWB) radar is a non-contact, active detection technology, which can be used to search for survivors in disaster rescues. The existing multi-target detection method based on UWB radar echo signals has low accuracy and has difficulty extracting breathing and heartbeat information at the same time. Therefore, this paper proposes a new multi-target localization and vital sign detection method using ultra-wide band radar. A target recognition and localization method based on permutation entropy (PE) and K means++ clustering is proposed to determine the number and...
Source: Sensors - June 21, 2023 Category: Biotechnology Authors: Jingwen Zhang Qingjie Qi Huifeng Cheng Lifeng Sun Siyun Liu Yue Wang Xinlei Jia Tags: Article Source Type: research