Research and practice on training mode of applied talents for electrical engineering majors in universities

The training of applied talents focuses on students’ innovation ability and engineering practice ability, which requires electrical engineering teachers to fully embody the integration of theoretical knowledge and engineering practice in their teaching. In the teaching reform work, teachers should pay attention to optimize the teaching Settings, starting from two aspects of theory and practice, to promote students to obtain more knowledge of electricity, eff ectively develop students’ application level of electric electronic technology, and help students develop comprehensively. Colleges and universities should pay more attention to the training of application-oriented talents and train more qualifi ed talents for the development of social production. Based on this, this paper analyzes the practical strategies for the training mode of applied talents for electrical engineering majors in colleges and universities, in order to provide references for educators

Research on teaching reform of electrical majors in colleges and universities from the perspective of integration of production and education

Based on the vision of quality-oriented education reform, in order to meet the needs of the development of education and teaching at the present stage, university leaders and teachers should carry out teaching reform under the guidance of advanced ideas, in order to provide students with high-quality teaching services. As an electrical professional teacher, can be based on the integration of production and education under the background of the implementation of talent through training, that is, can teach students basic knowledge at the same time, guide them to master practical skills in practical training, rich practical experience, for their follow-up to adapt to social life and docking post work laid a solid foundation. In order to give full play to the application value of the integration model of production and education, electrical teachers need to explore the appropriate opportunity and path to build this advanced model in combination with automobile production demand, industry development trend, college education strategy and students’ actual learning situation, and then give play to the dominant position of schools, enterprises, governments and other institutions to provide students with quality training services. In the end, they can become the talents needed for social development and national construction. At the same time, they can improve the economic benefi ts of enterprises, promote the reform process of colleges and universities, and achieve win-win cooperation between schools and enterprises

Practical teaching reform of electrical major in colleges and universities in the new era

With the steady progress of a new round of energy reform, the rapid development of smart grid, the demand for high quality electrical talents will increase. The course “Power system analysis” occupies a relatively important position in electrical majors, and the course takes into account both theory and practice. Therefore, teachers should take the initiative to innovate their own teaching ideas, pay attention to practical teaching, and promote the connection between theoretical teaching and practical teaching, so as to comprehensively improve the teaching quality of the course and cultivate the high-quality talents needed by the industry. In this regard, this paper probes into the practical teaching reform of electrical major in colleges and universities in the new era, for reference only

Functional Group Effects on the HOMO–LUMO Gap of g-C3N4

Graphitic carbon nitride (g-C3N4) is a promising semiconductor material which has been widely studied in nanoscience. However, the effect of modifying the performance of g-C3N4 is still under debate. In this communication, we show the size and functional group effects on the g-C3N4 using density functional theory (DFT) calculations. It was found that a molecule with six repeated g-C3N4 units (g-C3N4-6) could be the smallest unit that converges to the limit of its HOMO–LUMO gap. Calculations of g-C3N4-6 with varying numbers of substituted C≡N, C=O, and O−H functional groups show that C≡N and C=O could narrow down the HOMO–LUMO gap, while O−H could slightly raise the gap. This study shows that the change of substituents could tune the band gap of g-C3N4, suggesting that rationally modifying the substituent at the edge of g-C3N4-based materials could help to significantly increase the photocatalytic properties of a metal-free g-C3N4

Influence of a tilted cavity on quantum-dot optoelectronic active devices

Quantum-dot laser diodes (QD-LDs) with a Fabry-Perot cavity and quantum-dot semiconductor optical amplifiers (QD-SOAs) with 7° tilted cavity were fabricated. The influence of a tilted cavity on optoelectronic active devices was also investigated. For the QD-LD, high performance was observed at room temperature. The threshold current was below 30 mA and the slope efficiency was 0.36 W/A. In contrast, the threshold current of the QD-SOA approached 1000 mA, which indicated that low facet reflectivity was obtained due to the tilted cavity design.A much more inverted carrier population was found in the QD-SOA active region at high operating current, thus offering a large optical gain and preserving the advantages of quantum dots in optical amplification and processing applications. Due to the inhomogeneity and excited state transition of quantum dots, the full width at half maximum of the electroluminescence spectrum of the QD-SOA was 81.6 nm at the injection current of 120 mA, which was ideal for broad bandwidth application in a wavelength division multiplexing system. In addition, there was more than one lasing peak in the lasing spectra of both devices and the separation of these peak positions was 6-8 nm,which is approximately equal to the homogeneous broadening of quantum dots

New Insights into CO2 Adsorption on Layered Double Hydroxide (LDH)-Based Nanomaterials

Abstract The interlamellar spacing of layered double hydroxides (LDHs) was enlarged by dodecyl sulfonate ions firstly, and then, (3-aminopropyl)triethoxysilane (APS) was chemically grafted (APS/LDHs). The structural characteristics and thermal stability of these prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), reflectance Fourier transform infrared spectrometer (FTIR), thermogravimetric analysis (TG), and elemental analysis (EA) respectively. The CO2 adsorption performance was investigated adopting TG and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results presented that the CO2 adsorption capacity on APS/LDHs was as high as 90 mg/g and showed no obvious reduction during a five cyclic adsorption-desorption test, indicating its superior performance stability. The DRIFTS results showed that both carbamates and weakly bounded CO2 species were generated on APS/LDHs. The weakly adsorbed species was due to the different local chemical environment for CO2 capture provided by the surface moieties of LDHs like free silanol and hydrogen bonds

Cl Species Transformation on CeO₂(111) Surface and Its Effects on CVOCs Catalytic Abatement: A First-Principles Investigation

Cl species transformation and deactivation effects on ceria (111) model catalysts were investigated in the first-principles framework. Conventionally, the strong adsorption of Cl atom in the oxygen vacancy of ceria was believed to be the dominant deactivation factor. However, under the typical conditions of chlorinated volatile organic compounds (CVOCs) catalytic combustion, the deactivation was found to be hindered because of the high O₂/Cl ratio in the reactants’ feed. Then, the possible formation pathways of Cl₂ and HCl during CVOCs catalytic abatement reaction were proposed. It was identified that the H-bond interaction between surface hydroxyls and Cl species was the key factor to control the selectivity in the final product of Cl species (HCl or Cl₂). By introduction of H₂O or other H resources, the coverage of surface OH radicals could be increased, which in turn benefits the conversion to HCl over Cl₂. However, the competitive adsorption between H₂O and oxygen on vacancy would lead to somewhat of a loss of low-temperature catalytic activity

SO₂ Poisoning Structures and the Effects on Pure and Mn Doped CeO₂: A First Principles Investigation

SO_<i>x</i> poisoning effects in environmental catalysis have long been recognized as a challenge in development of efficient catalysts for industrial applications. In this paper, a theoretic method combining density functional theory and standard thermodynamic data (enthalpy and entropy) was applied to investigate the SO₂ poisoning to pure and Mn doped CeO₂ as model catalysts in realistic temperature and pressure. Surface Ce­(SO₄)₂ rather than Ce₂(SO₄)₃ was identified to be the most stable poisoning structure on pure CeO₂. The SO_<i>x</i> poisoning to the catalysts could not be surmounted simply by heteroatom doping, since the introduction of Mn will enhance the thermal stability of the surface sulfate. The results also indicated that the Lewis acidity of the catalysts could be enhanced by slightly sulfating, which might make some positive effect on catalytic performances for the abatement of environmentally sensitive species including NH₃, NO, CO, and hydrocarbons