5G NTN关键技术研究与演进展望

5G非地面网络（non-terrestrial network,NTN）技术是5G通信系统面向卫星通信和低空通信等新应用场景的重要技术，标志着5G技术应用从陆地通信走向了空间通信。首先分析了5G NTN和地面5G的差异点，包括网络架构、时频同步、HARQ和移动性管理等。进而介绍了3GPP Release 17的5G NTN标准进展及关键技术点与3GPP Release 18的5G NTN增强技术。最后展望了未来空、天、地一体化的技术演进。通过对5G NTN技术研究和标准分析，明确了5G和卫星通信融合的技术路线，并为后续6G空、天、地融合系统研究和设计提供基础。     

Molecular dynamics study of anisotropic shock responses in oriented α-quartz single crystal

Journal of Materials Science - This paper presents an investigation aimed at understanding the shock wave propagation response of oriented α-quartz single crystals by using molecular dynamics...     

Phenolic profiling reveals the metabolite basis of flesh colour and fresh-cut browning in apple fruit

Flesh colour, which is affected by cultivars and browning, can largely impact consumer acceptance in fresh-cut apples. The study profiled phenolic metabolites from apple flesh of twenty-three cultivars by widely targeted metabolomics. Comparison among white- and yellow-fleshed cultivars showed fifteen phenolics, mainly quercetin 3-O-glucoside, hyperoside, hesperetin 5-O-glucoside and cymaroside, in white-fleshed apples were significantly higher than those in yellow-fleshed apples. It may indicate a metabolite basis of yellow and white flesh colour, and better potential nutrition in white-fleshed apples. In addition, ten phenolic metabolites including five cyanidin glycosides showed significant differences between the highest and the lowest browning groups, indicating them may be crucial in browning of fresh-cut apple. This work elucidates the differences of phenolic profiles among apple cultivars with different flesh colour and provides useful data to evaluate the suitability of apple for fresh-cut processing.     

Improved thermal stability of the near-infrared Al-modulated Zn3Ga2GeO8: Cr3+ phosphors for plant growth applications

The exploration of the high thermal stability near-infrared (NIR) phosphors is significantly crucial for the development of plant lighting. However, NIR phosphors suffer from the poor chemical and thermal stability, which severely limits their long-term operation. Here, the successful improvement of luminous intensity (149.5%) and thermal stability at 423 K of Zn₃Ga₂GeO₈ (ZGGO): Cr³⁺ phosphors is achieved for the introduction of Al³⁺ ions into the host. The release of carriers in deep traps inhibits the emission loss for the thermal disturbance. Furthermore, an NIR light emitting diodes (LEDs) lamp is explored by combining the optimized Zn₃Ga_1.1675Al_0.8GeO₈: 0.0325Cr³⁺ phosphors with a commercial 460 nm blue chip, and the emission band can match well with the absorption bands of photosynthetic pigments and the phytochrome (P_R and P_FR) of plants. The explored LEDs lamp further determines the growth and the pheromone content of the involved plants for the participation of the NIR emission originated from Cr³⁺ ions. Our work provides a promising NIR lamp as plant light with improved thermal stability for long-term operation.     

“一带一路”背景下粉彩团花纹饰设计传承与创新

目的 以现代设计的角度解析粉彩团花纹饰，探索其传承创新的可能性。在相关研究的基础上，丰富并启发传统纹饰研究，促进传统纹饰在当代设计中的多元融合，给当下设计提供传承与创新理论支持。方法 研究“一带一路”的传统文化艺术源头，以景德镇粉彩纹饰为切入点，用现代设计的法则解析粉彩团花纹饰的形成。对馆藏的典型粉彩团花纹饰举例说明，分析其纹饰在艺术性、功能性及思想性上的独特之处，为传统纹饰在当代设计的创新做出一些有意义的探索。结论 “一带一路”背景下研究中国传统纹饰艺术不仅有历史考古与文化收集的价值，也有审美的价值。通过设计角度的解构和分析粉彩团花纹饰的基本特征、文化意义、艺术审美和传承载体等，有利于进一步解读“一带一路”源头的中国传统文化艺术内涵，促进传统元素在当代艺术中的创意传承与创新发展。     

Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak

Several results based on the Langmuir probes' data on the HL-2A tokamak are presented. The blob structures' radial and poloidal drift velocities, estimated by the gradient of floating potential and by time delay evaluation, are compared in different line-averaged density and electron cyclotron resonance heating conditions. A positive correlation is observed in the comparison between blobs' radial velocity estimated by the two methods mentioned above, regardless of the situation differences mentioned above. Correlation is also observed in the comparison between the blobs' poloidal velocity estimated by the two methods in different situations, while a shift due to the different line-averaged density is observed. These results imply that the radial gradient of floating potential may have some value as a reference during data analysis in low-parameter discharge.