19 research outputs found
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
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 90Â 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
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
Cl Species Transformation on CeO<sub>2</sub>(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 O<sub>2</sub>/Cl ratio in the reactants’
feed. Then, the possible formation pathways of Cl<sub>2</sub> 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 Cl<sub>2</sub>). By introduction of
H<sub>2</sub>O or other H resources, the coverage of surface OH radicals
could be increased, which in turn benefits the conversion to HCl over
Cl<sub>2</sub>. However, the competitive adsorption between H<sub>2</sub>O and oxygen on vacancy would lead to somewhat of a loss of
low-temperature catalytic activity
SO<sub>2</sub> Poisoning Structures and the Effects on Pure and Mn Doped CeO<sub>2</sub>: A First Principles Investigation
SO<sub><i>x</i></sub> 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 SO<sub>2</sub> poisoning to pure and Mn doped CeO<sub>2</sub> as
model catalysts in realistic temperature and pressure. Surface CeÂ(SO<sub>4</sub>)<sub>2</sub> rather than Ce<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> was identified to be the most stable poisoning structure
on pure CeO<sub>2</sub>. The SO<sub><i>x</i></sub> 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 NH<sub>3</sub>, NO,
CO, and hydrocarbons