A non-dispersive infrared (NDIR) gas sensor with an integrated optical chamber was designed to accurately detect multiple concentrations in a complex polluted environment. This consists of hexagonal prism shell and reflection plate. In particular, six dual-channel detectors for sensing different gases one collimated light source are the chamber. The IR emitted by arrives at these after four reflections. result simulation data collection path length luminous flux shows that average is 63 mm,...

A sensor operating at room temperature has low power consumption and is beneficial for the detection of environmental pollutants such as ammonia benzene vapor. In this study, polyaniline (PANI) made from aniline under acidic conditions by chemical oxidative polymerization doped with tin dioxide (SnO2) a specific percentage. The PANI/SnO2 hybrid material obtained then ground temperature. results scanning electron microscopy show that prepared powder comprises nanoscale particles good...

Abstract Food quality detection is of great importance for human health and industrial production. Currently, the common methods are difficult to achieve need fast, accurate, non-destructive detection. In this work, an electronic nose (E-nose) method based on combination convolutional neural network combined with wavelet scattering (CNN-WSN) improved seahorse optimizes kernel extreme learning machine (ISHO-KELM) proposed identifying level a variety food products. feature extraction part,...

To realize automatic measurement of the concentration dust particles in air, a theory for was developed, and system designed to implement method based on laser scattering. In study, principle detection using scattering is studied, basis Mie determined. Through simulation, influence incident wavelength, particle diameter, refractive index scattered light intensity distribution are obtained determining curves single suspended under different characteristic parameters. A genetic algorithm used...

High sensitivity and selectivity short response recovery times are important for practical conductive polymer gas sensors. However, poor stability, selectivity, long significantly limit the applicability of single-phase conducting polymers, such as polypyrrole (PPy). In this study, PPy/MoS2 composite films were prepared via chemical polymerization mechanical blending, flexible thin-film resistive NO2 sensors consisting copper heating, fluorene polyester insulating, sensing layers with a...

This paper presents a ZnO-Pt/Ru sensor prepared by two-step hydrothermal method with in situ-grown ZnO nanorods and doped Pt Ru elements immersion sintering. Characterization results showed that were successfully modified on the surface of nanorods. achieved response 25-50 ppm H2S at optimum operating temperature 198 °C. In addition, lower limit detection reached 50 ppb about 10%, indicating wide concentration range. Due to good catalytic properties Pt, recovery characteristics high...

Deep neural networks have been widely applied for gas concentration estimation in low-cost sensor arrays; however, their dependency on sample distribution remains a significant challenge. Current research indicates that deep learning models are susceptible to imbalance, where predictive accuracy is strongly influenced by the number of available samples. In arrays used monitoring indoor and outdoor harmful emissions, most response values remain within normal range, while only limited exhibit...

Prolonged life expectancy in humans has been accompanied by an increase the prevalence of cancers. Breast cancer (BC) is leading cause cancer-related deaths. It accounts for one-fourth all diagnosed cancers and affects one eight females worldwide. Given high BC prevalence, there a practical need demographic screening disease. In present study, we re-analyzed large microRNA (miRNA) expression dataset (GSE73002), with goal optimizing miRNA biomarker selection using neural network cascade (NNC)...

Owing to harsh working environments and complex industrial requirements, traditional gas sensors are prone deformation damage, possess a limited detection range, require high temperature, display low reliability, thereby necessitating the development of flexible low-temperature sensors. In this study, we developed polyimide (PI)-based sensor comprising reduced graphene oxide (rGO)/MoS2 composite. The micro-electro-mechanical system technology was used fabricate Au electrodes on PI sheet form...

Exhaled nitric oxide trace gas at the ppb level is a biomarker of human airway inflammation. To detect this, we developed method for collection active pumping electronic nose bionic chamber gas. An optimization algorithm based on multivariate regression (MR) and genetic algorithm–back propagation (GA-BP) was proposed to improve accuracy trace-level detection. used NO by substituting breathing with sample The impact pump suction flow capacity variation response system determined using an...

This paper presents a cardiac-sound-detection system based on an acoustic-pressure sensor array. The traditional cardiac-sound probe has the disadvantages of high cost and thick structure, which makes embedding difficult. Therefore, methodology for detection, comprising sound-pressure array, is proposed to achieve low cost, very thin, wearable probe, can be embedded in furniture or clothes long-term heart sound monitoring. By introducing several miniature electret-condenser-microphone-based...

Modern chemical production processes often emit complex mixtures of gases, including hazardous pollutants such as NO2. Although widely used, gas sensors based on metal oxide semiconductors WO3 respond to a wide range interfering gases other than Consequently, developing with high NO2 selectivity is challenging. In this study, simple one-step hydrothermal method was used prepare nanorods modified black phosphorus (BP) flakes sensitive materials for sensing, and BP-WO3-based...

Upon compression, large close-packed aggregates in the mixed LB films split into small uniform ones. Hysteresis degree can be interpreted with chain entanglement and block mobility.

This paper describes the design and implementation of a radiosonde which can measure meteorological temperature, humidity, pressure, other atmospheric data. The system is composed CPU, microwave module, temperature sensor, pressure sensor humidity array. In order to effectively solve condensation problem due low temperatures in high altitude environment, capacitive including four sensors collect platinum resistance heater was developed using micro-electro-mechanical-system (MEMS) technology....

Air pollution is one of the major threats to human health. The monitoring toxic NO2 gas in urban air emission becoming increasingly important. Thus, development an sensor with low power consumption, cost, and high performance urgent. In this paper, a planar structural micro hotplate based on AlN ceramic substrate annular Pt film heater was designed prepared by micro-electro-mechanical system (MEMS) technology, which Pt/Nb/In2O3 composite semiconductor oxide used as sensitive material molar...

In areas where livestock are bred, there is a demand for accurate, real-time, and stable monitoring of ammonia concentration in the breeding environment. However, existing electronic nose systems have slow response times limited detection accuracy. this study, we introduce novel solution: bionic chamber construction optimized, sensor data analyzed using an intelligent algorithm. We analyze structure biomimetic surface airflow array to determine sensing units system. The system employs detect...

A comprehensive understanding of the enhancement mechanism substrate material is crucial to ensure repeatability and functionality SERS detection technology. Therefore, this study proposes a theoretical analysis method that combines electromagnetic chemical achieve effect magnetic composite substrate. The visual model employed in comprehensively analyze illustrate electric field optical effects materials. also elucidated adsorption charge transfer between target molecules. Based on theory,...

In this paper, a room-temperature NO2 sensor based on polyaniline (PANI)/black phosphorus (BP) composite material was proposed to solve the power consumption problem of traditional metal-oxide sensors operating at high temperatures. PANI synthesized by chemical oxidative polymerization, whereas BP low-pressure mineralization. The PANI/BP materials were prepared via ultrasonic exfoliation and mixing. Various characterization techniques, including scanning electron microscope (SEM), X-ray...