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Power consumption is a significant part of the cost for growing silicon crystals by the Czochralski (CZ) method, and reducing power consumption is a key technical concern, especially for the photovoltaic industry. In this study, a global 3D numerical model of the CZ furnace was developed, and the non-axisymmetric furnace components such as the heater electrodes and exhaust vents were taken into consideration. Based on the model, numerical simulations were performed to study the power consumption and heat transfer in the CZ furnace, and the results were verified by comparing with experimental data. The power consumption distribution and paths of convective, radiative, and conductive heat transfer in the CZ furnace are systematically analyzed. The influence of silicon crystal length on heat transfer paths was also investigated. This study can provide an important theoretical reference for achieving a refined power reduction in CZ silicon crystal growth. [ABSTRACT FROM AUTHOR]

As one of the main imaging methods, a lot of attention has been directed to reverse time migration anisotropic media. However, reverse time migration still faces cost and memory limitations, especially in imaging high frequencies. A coordinate transformation strategy in transversely isotropic media with a vertical axis of symmetry (VTI) was utilized to obtain high-resolution images useful for stratigraphic interpretation. The coordinate transformation converted traditional depth domain imaging into pseudo-depth domain imaging. In addition, this paper used the Graphics Processing Unit (GPU) parallel strategy and compared the imaging approach with the conventional acoustic isotropy method. By testing several models and field data, it concludes that Graphics Processing Unit parallel strategy can significantly improve the computational efficiency of imaging. The pseudo-depth domain method also has obvious advantages in computational time and memory consumption. Moreover, it is more reasonable when considering anisotropy for complex laminated layers.

Designing and synthesizing highly efficient hydrogen-producing catalysts using morphological control techniques and path structure layouts based on photogenerated electron migration can effectively address environmental pollution and promote clean energy development. However, exploitating stabilized photocatalysts with exceptional photocatalytic performance remains challenging. Herein, Ni3S4/ZnCdS quantum dots (NZCS QDs) were synthesized at room temperature for high-efficiency photocatalytic H2 production. l-Cysteine (l-Cys) as constitution controller controlled the composition of the NZCS QDs by limiting their growth, and the photogenerated electrons of the cocatalyst Ni3S4 rapidly captured the photogenerated holes of ZCS QDs. This process resulted in a significant increase in the H2 evolution rate of NZCS QDs up to 5.03 mmol·g–1·h–1, which was 8.98 times greater than that of CdS QDs. The experimental findings indicated that the increased rate of H2 production was primarily attributed to the higher number of active sites, faster type-S photogenerated electron–hole separation driven by an internal electric field, and enhanced charge reaction efficiency of the NZCS QDs. This study presents a credible synthetic approach for NZCS QDs and offers a solution to improve the efficiency of photocatalytic reactions based on ZnCdS. [ABSTRACT FROM AUTHOR]

Nanoarray of spinel transition metal oxides has unique advantages over its nanowires and nanoparti-cles, and has important applications in many fields such as energy storage, catalysis, magnetism and optoelectronics. In this paper, various factors (substrate, reaction temperature, reaction time, raw materials, etc.) affecting the structure and morphology of spinel transition metal oxide nanoarrays prepared by hydrothermal/solvothermal method are summarized. The correlation between the structure and morphology of nanoarrays and their properties is discussed. The related research on the hierarchical structure of spinel transition metal oxide nanoarrays is briefly introduced. It is hoped that it can promote the design and development of multifunctional or functionally integrated nanoarrays and broaden their application range. [ABSTRACT FROM AUTHOR]