Chopped pepper, a traditionally fermented condiment product in China, is widely consumed because of its good flavor. However, large amounts of byproduct, namely, chopped pepper seeds (CPS) are produced annually during the manufacture of chopped pepper product, and this material is generally classified as solid waste, which causes waste of resource. In this work, the total phenolics (TPC) and capsaicinoids content, antioxidant property, and αglucosidase inhibitory activity (GIA) of three varieties CPS (i.e., WPS, LPS, and BRPS) were assessed. The effects of solvents with different polarities, including 80% methanol, 80% acetone, and 80% ethanol, in extracting the bioactive compounds were also investigated. The results indicated that the studied CPS were rich in total phenolics and capsaicinoids with contents of 3,934-6,208 μg GAE/g dw and 1,052-3,692 μg/g dw, respectively. Three capsaicinoid compounds, namely, capsaicin, dihydrocapsaicin, and nordihydrocapsaicin, in the CPS were identified and quantified by HPLC. All CPS samples exhibited potent antioxidant property and GIA. Moreover, the different extraction solvents exhibited considerable influence on TPC, capsaicinoid content, antioxidant capacity, and GIA. Regardless of different polarities extraction solvents, BRPS had the highest level of phenolics, capsaicin, dihydrocapsaicin and nordihydrocapsaicin and exhibited the strongest antioxidant activity and GIA among the three varieties CPS studied. In practical applications, the use of 80% ethanol is recommended for the extraction of bioactive compounds from BRPS, because it is environment friendly. Positive correlations between phenolics, capsaicinoids, antioxidant activity, and GIA were observed by PCA and linear correlation analysis. Thus, CPS, especially BRPS, is abundant and can be a cheap source of natural antioxidants and anti-diabetic compounds, making it an interesting ingredient in the potential future development of nutraceuticals or functional food products and bringing great advantages for food and pharmaceutical industries, consumers, and producers.

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Abstract. The reduction and control of residual stress is very important to improve the surface quality and machining accuracy of the parts. In this paper, in order to reveal the effects of different milling modes and process parameters on the residual stress, the aluminum alloy Al7050-T7451 is used as the machining object and the finite element simulation software AdvantEdge is applied in establishing the milling model. It is found that up-milling is better than down-milling in low-speed and there is no obvious difference between them in high-speed. Besides, high-speed machining can obtain the smaller depth of sub-surface residual stress. Compared with low-speed, high-speed is more advantageous to realize the unification of quality and efficiency. What's more, decreasing cutting width and improving cutting depth is easy to obtain ideal residual stress when the material removal rate is constant. Experiments on up-milling and down-milling have verified the validity of the finite element model and the effects of milling modes and process parameters on the residual stress. It has laid a solid theoretical and practical basis for constructing process optimization criteria, choosing appropriate milling modes and optimizing process parameters.

Abstract-High channel bit error rate, long delay and other characteristics of the satellite network, will cause the file in the process of transmission is easy to interrupt or packet loss. In order to improve the efficiency of file transfer, the server sends data once, while multiple earth station clients receive., and proposed broken-point continuingly-transgerring mechanism based on satellite network, this mechanism will enable the earth station just accept the unreceived data, which greatly improves the efficiency of file transfer.

Compression and differential technology make the storage and transmission of files more efficient, and has an important role in the field of storage and synchronization. This paper introduces the development of incremental updating technology and the current major incremental updating algorithm. Dividing incremental updating algorithms into three classes by the searching method of sequence search, dictionary search and suffix tree search. Finally, test the typical incremental update algorithms and analysis their performance.