Conductive polymer ultrafine fibers via electrospinning: Preparation, physical properties and applications

Remaining useful life prediction for supercapacitor based on long short-term memory neural network

The pioneering exfoliation of monolayer tungsten diselenide has greatly inspired researchers toward semiconducting applications. WSe 2 belongs to a family of transition-metal dichalcogenides. Similar to graphene, WSe 2 and analogous dichalcogenides have layered structures with weak van der Waals interactions between two adjacent layers. First, the readers are presented with the fundamentals of WSe 2, such as types, morphologies, and properties. Here, we report the characterization principles and practices such as microscopy, spectroscopy, and diffraction. Second, the methods for obtaining high-quality WSe 2 , such as exfoliation, hydrothermal and chemical vapor deposition, are briefly listed. With advantages of light weight, flexibility, and high quantum efficiency, 2D materials may have a niche in optoelectronics as building blocks in p-n junctions. Therefore, we introduce a state-of-the-art demonstration of heterostructure devices employing the p-type WSe 2 semiconductor. The device architectures include field-effect transistors, photodetectors, gas sensors, and photovoltaic solar cells. Due to its unique electronic, optical, and energy band properties, WSe 2 has been increasingly investigated due to the conductivity of the p-type charge carrier upon palladium contact. Eventually, the dynamic research on WSe 2 and van der Waals heterostructures is summarized to arouse the passion of the 2D research community.

WSe2 2D p-type semiconductor-based electronic devices for information technology: Design, preparation, and applications

Hybrid genetic algorithm method for efficient and robust evaluation of remaining useful life of supercapacitors

Fe3O4 nanoparticles three-dimensional electro-peroxydisulfate for improving tetracycline degradation.

Human–machine interaction (HMI) allows the transfer of human intent to the robot and the collection of feedback from the robot. Human perception of the outside world is a direct response to human brain training, but low-level perception movements of robots are more complex than advanced reason. In the study, we designed a self-powered electronic skin (SPES) based on a piezoelectric nanogenerator (PENG). SPES shows a good piezoelectric effect and certain mechanical flexibility and can realize gesture recognition and tracking by sensing external pressure stimulation in HMI. Through the feedback control of the closed-loop system, the equivalent behavior trigger of the real intelligent robotic capacitive touch sensors (CATS) and SPES can be realized. SPES and Robot Hall Rotary Position Sensor (HRPS) have small perceptual errors, and remote signal feedback and behavior control of intelligent robots are realized by wireless transmission equipment, which is a greater advantage in a flexible environment. The proposed SPES tracking application in the HMI has great potential in the future artificial intelligence environment, the auxiliary equipment for people with disabilities, and the human–machine cooperation in a flexible environment. 

Self-Powered Electronic Skin for Remote Human–Machine Synchronization

The harmonics of line to line voltage in two-stage matrix converter (TSMC) with fixed carrier frequency had discrete and high values and produced powerful electromagnetic interference (EMI). In this paper, chaotic carrier frequency modulation technique (CCFMT) was applied in TSMC for the first time to spread sideband range and suppress harmonic peak value. Although this technique could suppress EMI, it would increase the probability of narrow pulses. In order to improve reliability, the rectifier in the two-stage matrix converter uses PWM modulation with zero vector to extend the zero current commutation time, solves the narrow pulse problem, and simplifies the commutation process. At last, an experiment platform was designed and experimental results showed that harmonics of line to line voltage was efficiently suppressed.

/pdf/application-research-of-chaotic-carrier-frequency-modulation-2siu76ek6b.pdf

Application Research of Chaotic Carrier Frequency Modulation Technology in Two-Stage Matrix Converter

Human-computer interaction is a bridge connecting humans and intelligent robots. Signal sensing and feedback are the key links. In this paper, a reinforced flexible hybrid nanogenerator (NG) based on PVDF/ZnO is designed. In the hybrid mode, the open circuit voltage can reach 70 V, the short circuit current can reach 12 μA, and the output performance can be increased by 25%. In this experiment, the charge density of the PVDF/ZnO surface was 12.79 μC/m2, the power density was 1.22 μW/cm2, and a 500 μF supercapacitor could be filled in 100 s. Through finite element analysis and experimental tests, it is proved that it is a more sensitive self-powered flexible hybrid sensor, which can accurately record the amplitude and frequency of human motion. Through pressure-friction hybrid sensing, intelligent robots can realize gesture recognition and tracking of human.

Attitude Tracking of Enhanced Flexible Hybrid Nanogenerator in Human-computer Interaction

Structural Design and Electrochemical Performance of PANI/CNTs and MnO2/CNTs Supercapacitor

A flexible, multi-site tactile and thermal sensor (MTTS) based on polyvinylidene fluoride (resolution 50 50) is reported. It can be used to implement spatial mapping caused by tactile and thermal events and record the two-dimensional motion trajectory of a tracked target object. The output voltage and current signal are recorded as a mapping by sensing the external pressure and thermal radiation stimulus, and the response distribution is dynamically observed on the three-dimensional interface. Through the mapping relationship between the established piezoelectric and pyroelectric signals, the piezoelectric component and the pyroelectric component are effectively extracted from the composite signals. The MTTS has a good sensitivity for tactile and thermal detection, and the electrodes have good synchronism. In addition, the signal interference is less than 9.5% and decreases as the pressure decreases after the distance between adjacent sites exceeds 200 mm. The integration of MTTS and signal processing units has potential applications in human-machine interaction systems, health status detection and smart assistive devices.

A thermally flexible and multi-site tactile sensor for remote 3D dynamic sensing imaging

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