With the widespread popularity of social software and self-media, online public opinion incidents in colleges universities occur frequently present a complicated situation. In big data era, university students have gained more relaxed environment which to receive disseminate information, enabling them spread their opinions insights Internet rapidly, thus exacerbating riskiness information dissemination. We constructed CUOPO, first risk classification dataset China opinion, screened out...

With the continuous deepening that humans exploit underground space, tunnel engineering passing through sensitive strata, e.g., ultralarge buried depth, high water pressure, and active faults, has become more frequent. However, current tunnel-supporting concept emphasizes passive regulation effect of primary support secondary lining on surrounding rock deformation ignores principle fully utilizing self-bearing capacity in New Austrian Tunneling method. Therefore, supporting system is not...

The deformation resistance would be increased with the addition of Nb and Ti, which makes it difficult to accurately control rolling process, resulting in mixed grains cracks. hot behavior Nb–Ti microalloyed high strength steel was investigated temperature range 900–1100 °C strain rate between 0.1 5 s−1. recrystallization active energy obtained by regression calculation, thermal equation established. dynamic critical model established changing work hardening rate. results show that a higher...

Since the position of classroom surveillance camera is not fixed, angle face captured through video also different. The deep learning-based verification model has achieved good results in controlled environments, but there still much room for improvement ability uncontrolled environments. performance depends only on network quality and diversity dataset. current Asian dataset an environment insufficient; this reason, paper constructs a Chinese (UCEC-Face) environment, which collected by 35...

Summary An inverse analysis method that combines the back propagation neural network (BPNN) and vector evaluated genetic algorithm (VEGA) was proposed to identify mechanical geomaterial parameters for a more accurate prediction of deformation. The BPNN is used replace time‐consuming numerical calculations, thus enhancing efficiency analysis. VEGA find Pareto‐optimal solutions multiobjective functions. Unlike traditional back‐analysis methods which are based on only 1 type field measurement...

Constant on-time control has been widely used due to its advantages of fast transient response and light load efficiency. However, the scheme is intrinsically unstable if output capacitor's equivalent series resistance (ESR) not large enough, which needs ripple injection techniques enhance loop stability. The traditional passive compensation technique uses only component networks realize this function, exhibits some inherent shortcomings, including difficulties in high-speed current sensing...

Although the preparation of transition metal sulfides/oxides electrodes has been relatively perfected, it is still challenging to fabricate multi-component core-shell structure with excellent electrochemical performance. Herein, CoMoO4/MoO3@CuCoNi-S grown on nickel foam (NF) first synthesized via facile hydrothermal and electrodeposition methods. The electrode presents an exceptional specific capacitance (2600.0 F g-1 at 1 A g-1) 68.3% its initial 10 g-1. Moreover, a...

Tunnel construction in high geo-stress strata faces the risk of extreme natural disasters such as large squeezing deformation and rockburst. Therefore, it is great significance to adopt a high-precision inversion method investigate distribution law situ stress tunnel site area. In this paper, research was carried out based on plateau with buried depth more than 1000 m. The idea improving accuracy by unifying displacement constraints proposed aiming at defects traditional boundary conditions....

AlCoCrFeNiTi0.5 high-entropy alloy (HEA) shows excellent properties in hardness and corrosion resistance. HEA was prepared using a non-consumable vacuum arc furnace. Hot-deformation behavior of explored under 1073–1373 K with strain rate between 0.001 1 s−1 Gleeble-3800 thermomechanical simulator. The constitutive equation established the Arrhenius model, deformation activation energy material constant were obtained. processing map within 0.3–0.6 drawn according to dynamic model (DMM)....

Abstract The combustion instability in a propulsion system is ubiquitous problem. radial baffles usually installed on the injector faceplate eliminate (acoustic pressure oscillation) system. In this article, longitudinal are inner surface of combustor wall to control instabilities. first-order and second-order tangential modes induced experiments. effects parameters baffle acoustic oscillation cylindrical investigated. effect nozzle has been systematically It concluded that eigen-frequency...

This article introduced a digital switching power supply system based on the DSC control, focuses control unit of and software function realization. The main circuit uses isolated-type Half-Bridge topology. processor selects TI, PICCOLO Series chip, model is TMS320F28023. voltage closed-loop method PID algorithm governing output. system's output maximum current can nimble adjustable. has many features, such as fast response, low ripple factor, remote communications intelligence protection....

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In this paper, we present a electromechanical robot based on ARM&DSP and do the research its control technique method modern design philosophy techniques. First give brief introduction of mechanical construction experimental robot, then focuses embedded speech vision recognition system discussion platform. We deeply illustrate signal mechanism with multi-layer architecture. The multi-modal issues & are also analyzed further. It is new effective efficient solution for application robot.