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With the launch of the "Channel Computing Resources from the East to the West" project, Beijing-Tianjin-Hebei region, as a national integrated big-data center system, has established a Zhangjiakou data center cluster and continuously optimized the regional computing power layout. Beijing has been accelerating the construction of a global digital economy benchmark city since 2021, committed to forming a collaborative development pattern of computing power integration, and achieving a globally leading density of data centers. The core industry of Beijing's digital economy has strong fundamental advantages, but as a high-energy consuming industry, data centers cannot fully meet real-time computing power needs solely relying on the local infrastructure construction in Beijing. Therefore, this paper explored the promoting role of the Beijing-Tianjin-Hebei national integrated big-data center system in the construction of a global digital economy benchmark city in Beijing through channels such as computing power resource sharing, green energy consumption support, and industrial development collaboration. Based on this, it analyzed the challenges that still exist in current regional collaboration. [ABSTRACT FROM AUTHOR]

【Objective】By studying the hyperspectral characteristics of apple damage and establishing the best classification model of apple damaged area based on hyperspectral imaging, we can provide an important basis for realtime, rapid and accurate identification of apple damage.【Method】This paper investigates the use of hyperspectral image technology to detect mechanical damage on fruit surfaces using apple samples collected from Pinggu District, Beijing as the research object. Using the hyperspectral image (HSI) data in the range of 390-1 000 nm, the spectral response characteristics of the damaged and normal ROI areas was analysed by ratio spectroscopy, and three types of spectral indexes, namely the normalized difference spectral index (NDSI), the ratio spectral index (RSI) and the difference spectral index (DSI) were selected and constructed to better highlight the characteristics of the damaged areas..On the basis of these indexes, the spectral indexes with better ability to extract damage areas were selected, and the unsupervised data clustering algorithm of iterative self-organizing data analysis techniques algorithm (ISODATA) was used to extract apple damage areas.【Result】 The spectral reflectance changed significantly when the apple surface was damaged. After waveband optimization, it was found that the reflectance of 528 nm and 676 nm could effectively identify the abnormal areas. Based on the selected feature bands, the recognition spectral indexes for apple damage detection were constructed, including NDSI, RSI and DSI. By the pixel value analysis of the spectral index images, the damaged area features were distinguished from the normal area features in each SI enhanced image obviously. Among them, the difference between the NDSI pixel averages of the two types of image features was the largest, reaching 0.629, which indicated that the established NDSI has a strong ability to distinguish between the damaged area and normal area features. Using the unsupervised classification method ISODATA classification, it was verified that the spectral feature index has high specificity in detecting apple damage, and the accuracy rate of apple damage reached 92.50%. 【Conclusion】The results are applicable to the real-time and rapid detection of apple damage, providing a technical basis and reliable reference for the accurate management of apple production. [ABSTRACT FROM AUTHOR]

Generally speaking, Laoshe is a writer who tended to incorporate heavy local color into his own works. However, there is an important phenomenon in China’s literary history that Laoshe intentionally abandoned his depiction of Beijing’s local color in his writing in the early period of the Anti-Japanese War and stopped writing in his most skilled Beijing dialect. It’s not until around 1943 that Laoshe restarted to bring Beijing’s local customs into his novel writing. In this paper, the author tries to interpret this literary phenomenon by analyzing the reasons why Laoshe reused local color in his 1940s writing. In the final part of this paper, the author concludes that the reason why Laoshe abandoned Beijing’s local color in his writing in the early period of Anti-Japanese War is that he worried that the depiction of a certain region might not reflect the new image of Chinese people in Anti- Japanese War thus couldn’t encourage the whole nation. However, in around 1941, with Laoshe started to regard local color as an effective carrier and means of narration, the application of Beijing’s local color again became the most important characteristic of his works. [ABSTRACT FROM AUTHOR]

The paper starts from the analysis of the growing gap between traditional Chinese bibliography and modern academic development, and it will probe into the original intention of the distribution of Chinese catalogue cards of National Library of Peiping, namely the underlying motivation for Yuan Tung-Li's modern catalogue idea. Next, it depicts National Library of Peiping's early attempts, its active participation in the American academic circles as well as the compilation and distribution of Chinese catalogue cards with the support of the Rockefeller Foundation. Lastly, this study also discusses National Library of Peiping's influence upon the arrangement and categorization of the Chinese collection in American libraries. [ABSTRACT FROM AUTHOR]