Carbon dioxide mainly comes from industrial economic activities. Industrial structure optimization is an effective way to reduce carbon dioxide emissions. This paper uses the panel data of 13 cities in the Beijing-Tianjin-Hebei urban agglomeration from 2006 to 2019, uses the Theil index to calculate the industrial structure rationalization index, and uses the proportion of industrial added value to calculate the industrial structure upgrade index. By constructing the STIRPAT model, this paper quantitatively analyzes the impact of industrial structure rationalization and upgrade on carbon emissions. The results show that the rationalization and upgrading of industrial structure in the Beijing-Tianjin-Hebei urban agglomeration significantly inhibit carbon emissions. Compared with the rationalization of the industrial structure, the upgrading of industrial structure in the Beijing-Tianjin-Hebei urban agglomeration has a better effect on carbon emission reduction. For the Beijing-Tianjin-Hebei urban agglomeration, government expenditure on science and technology can promote the upgrading of industrial structure to a certain extent, thereby reducing carbon emissions. There is a big gap between the industrial structure development level of Hebei province and that of Beijing and Tianjin. Finally, based on the conclusion, this paper puts forward the policy enlightenment of promoting the optimization process of industrial structure and reducing carbon emissions of the Beijing-Tianjin-Hebei urban agglomeration.

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With the continuous development of science and technology, more and more technologies such as computers have been put into actual teaching work. Li's computer-assisted music teaching model can just make up for the single teaching model of exam-oriented education. Based on computer-assisted teaching technology, this article carries out the design and development of a digital music course teaching system. The system can easily digitally process the recorded sound and present it in the form of sound waves on the computer. It can visually edit the audio and save the specific training status in the database comprehensively, providing more information for teaching and training. Intuitive visual information and all parameters transform the theory and methods of skills into vivid image data information. At the same time, analysis and discussion on computer technology are carried out. Using computers, music production can be operated in an intuitive and visual environment, clarifying the theme of music, developing the structure, and post-production. It has been proved through practice that this system can not only provide for teaching and training More intuitive and vivid visual information and all parameters, which transform skill theory and methods into vivid image data information, can also significantly expend efficiency of music learning and the training of professional skills, which is worthy of vigorous promotion and practice.

The additive-free [3 + 2] annulation from isatins, amino acids with 2-styrylbenzoxazoles, was described, providing a series of functional and structurally complex 3,3′-pyrrolidinyl-spirooxindole derivatives containing four contiguous and two quaternary stereogenic centers in high yields (up to 95%) and excellent diastereoselectivities (up to >25:1 dr). Interestingly, the reaction exhibits switchable regioselectivity depending on the substrate of amino acids. With proline or thioproline as the substrate, the reaction afforded α-regioselective spirooxindole skeletons. In contrast, when piperidine acid is the substrate, the reaction provided γ-regioselective spirooxindole skeletons.

A new scan architecture is proposed for full scan designed circuits. Scan ip-ops are grouped together if they do not have a n y common successors. This technique produces no new redundant faults. Scan ip-ops in the same group have the same values in all test vectors. All scan ip-op groups form a scan forest, where each primary input drives the root of one scan tree. Test application time and test power based on the proposed scan forest architecture can be reduced drastically while pin overhead and delay o verhead should be the same as that of conventional scan design. It is shown that test application cost and test power with the proposed scan forest architecture can be reduced to the level of non-scan design circuits.