A few-layered-graphene monolith is synthesized via zinc-assisted pyrolysis for electrochemical capacitive deionization, showing remarkable salt adsorption capacity and rate.
Each individual is responsible for his or her own actions. Parents should guide their children to be responsible for their own behavior, but also take responsibility for their children actively. Through positive family education, parents engage in growth and reflection. With family education like this, parents get the result twice with half the effort. Parents need to actively seek out and use the positive patterns in the guide of family education. Parents need to find the root of the problem in family education and guide their children to grow up positively and healthily. The positive guide of family education can encourage more parents to take family education seriously and effectively.
The circuit of diode envelope detector is simple and easy to implement, which is of great significance to the detection of ordinary amplitude modulation waves. In engineering practices, the designed detector is required to be able to restore the original signal very well, so its working principles and distortions are worth studying. In the following paragraphs, the characteristics of the output voltage waveforms of different types of detectors are compared, four kinds of common distortion cases are analyzed, and the ranges of parameters to avoid distortion are given. Since most books focus on the analysis of the theory such as the derivation of equations but lack direct presentation of the output of the circuit, the simulation solution based on the software Multisim is paid much attention to in the following text boxes, which can visualize the detection of the circuit. By scanning the ranges of values of the parameters, the effect of the relevant parameters on the distortion of the detector output voltage is specifically investigated to further verify the theoretical derivation. According to these analyses, it is easy to design diode envelope detectors and select reasonable device parameters.
Mobile Learning has become a new field in e-learning and how to evaluate the quality and usability of mobile learning course (m-course) appears to be one of the valuable topics. In this research, we attempt to introduce the principle and processes of usability testing on m-course, and take Data Structure m-course as a study case to share our experience on the testing. We also analyze and explain results of this testing, with the hope that the others can improve their m-course design on our work.
This paper addresses the problem of the lack of intrinsic and contact parameters when applying the discrete element method to simulate and analyze the key aspects of white kidney bean seed sowing, harvesting and clearing. The experiment took white kidney bean seeds as the research object, measured the intrinsic parameters of white kidney bean seeds by using the universal testing machine, and measured the collision recovery coefficient of 0.445, static friction coefficient of 0.452 and rolling friction coefficient of 0.091 between white kidney bean seeds and Q235 steel plate by physical test and EDEM discrete element simulation parameter calibration. The stacking experiment was carried out by the cylinder lifting method, numerical processing was performed with MATLAB, and the actual stacking angle of white kidney bean seeds was 31.28°. The steepest climbing test was designed with the interspecific contact parameters as factors and the relative error between the actual and simulated stacking angles as indicators. The optimal combination of the interspecific contact parameters of white kidney bean was determined by response surface optimization analysis, and the interspecific collision recovery coefficient of white kidney bean was obtained as 0.39, static friction coefficient was 0.53, rolling friction coefficient was 0.092. Using the optimal parameters for the simulation test, the relative error between the actual stacking angle of white kidney bean seeds and the simulated stacking angle was 1.63%, indicating that the calibrated simulated contact parameters were reliable and could provide reference for the discrete element simulation of white kidney bean seeds.
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