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为了研究油茶籽油氧化稳定性机制，了解不同预处理方式对油茶籽油抗氧化能力的影响，以DPPH自由基清除能力为指标，对油茶籽分别经红外与微波预处理后得到的油茶籽原油及其极性组分和非极性组分抗氧化能力进行分析。结果表明：油茶籽分别经红外和微波预处理后，得到的油茶籽原油及其极性、非极性组分DPPH自由基清除能力变化显著；红外预处理的油茶籽所制油茶籽原油及其非极性组分的DPPH自由基清除能力高于相应微波预处理，其最大值分别高3.53 μg/g和6.47 μg/g；微波预处理的油茶籽所制油茶籽原油中极性组分的DPPH自由基清除能力最大值比相应红外预处理的高38.77 μg/g。油茶籽原油对DPPH自由基的清除能力主要来自其极性组分，非极性组分的DPPH自由基清除能力弱于极性组分。 In order to study the oxidation stability mechanism of oil-tea camellia seed oil and understand the effect of different pretreatment on the antioxidant capacity of oil-tea camellia seed oil, the antioxidant capacity of crude oil-tea camellia seed oil and its polar and non-polar components obtained from oil-tea camellia seed pretreated by infrared and microwave were analyzed using the DPPH radical scavenging capacity as the index. The results showed that the DPPH radical scavenging capacity of crude oil-tea camellia seed oil and its polar and non-polar components changed significantly after infrared and microwave pretreatment of oil-tea camellia seed respectively. The DPPH radical scavenging capacity of crude oil-tea camellia seed oil and its non-polar components from the oil-tea camellia seed pretreated by infrared was higher than that of the corresponding microwave pretreatment, and its maximum values were 3.53 μg/g and 6.47 μg/g higher respectively. The highest DPPH radical scavenging capacity of polar component of crude oil-tea camellia seed oil made from microwave pretreated oil-tea camellia seed was 38.77 μg/g higher than that of corresponding infrared pretreated. The DPPH radical scavenging capacity of crude oil-tea camellia seed oil was mainly from its polar components, while the scavenging effect of non-polar components was weaker than that of polar components.

BACKGROUND: With the extensive development of national fitness activities, nighttime exercise has gradually become a social trend. However, what effects nighttime exercise will have on sleep, the characterization of sleeping changes and the mechanisms of action are not clear. OBJECTIVE: To analyze the characterization and mechanisms of nighttime exercise on sleep. METHODS: We searched the China National Knowledge Infrastructure (CNKI), PubMed database, and Web of Science database with the search terms of “sport, exercise, physical activity, physical exercise, workout, sleep, asleep, daily routine” in Chinese, and “nocturnality, night, nighttime, exercise, sport, physical activity, sleep, slumber, dorm” in English for literature on how nighttime exercise affects sleep and its mechanism of action. Finally, 55 articles were included. RESULTS AND CONCLUSION: Sleep consists of two phases: rapid eye movement and non-rapid eye movement. Sleep regulation relies on the close coordination of neural circuits and molecules in different brain regions, while the homeostatic components of the organism and circadian rhythms are also important factors in the regulation of sleep. The effects of exercise on sleep have evolved from an early focus on the central nervous system to the addition of somatic physiology and now multiple dimensions have been investigated, revealing multifaceted effects of exercise on sleep, including subjective sleep quality, sleep continuity, and sleep quantity and sleep structure. Nighttime exercise-affected sleep is subjected to the constraints of exercise conditions and exercisers and shows certain complexity, but the heterogeneity, time-dependence, and instability characteristics of nighttime exercise-affected sleep can provide some guidance for nighttime exercisers in minimizing the impact on sleep. Mechanisms by which nighttime exercise affects sleep are related to the reduction of melatonin secretion, the increase of core body temperature, and energy expenditure. People with high sensitivity of their own sleep to nighttime exercise should avoid nighttime exercise as much as possible, and those with low sensitivity should also pay attention to the fact that the time of nighttime exercise should have a long interval with sleeping time, and the intensity should not be too high. Some measures can be adopted to safeguard sleep after exercise, such as energy replenishing after exercise, and reduced use of electronic devices. [ABSTRACT FROM AUTHOR]

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Copyright of Chinese Journal of Liquid Crystal & Displays is the property of Chinese Journal of Liquid Crystal & Displays and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objectives: This study investigates the impact of onboard receiver antenna phase center correction and zero-difference ambiguity resolution on the precise orbit determination (POD) of the Gaofen-3 (GF3A) satellite. Methods: The reduced-dynamic precise orbit determination for GF3A was carried out using onboard global positioning system (GPS) observation from December 2016 to February 2017, and the orbit accuracy was evaluated by orbit overlap comparison. Results: The data quality analysis shows that the average of available GPS satellites per epoch remains around 7.The multipath errors for C1 and P2 code observations are 0.89 m and 0.34 m. POD results indicate that the radial, along-track, and cross-track overlapping orbit differences have been reduced from 7.9 mm, 12.8 mm, and 15.5 mm to 4.3 mm, 6.6 mm, and 8.6 mm by modeling onboard GPS antenna phase center correction. Furthermore, the orbit accuracy can be further improved to 3.3 mm, 3.5 mm, and 3.3 mm by fixing the zero-difference ambiguities. Conclusions: Generally, the orbit accuracy of GF3A is comparable to that of the reprocessed Sentinel-1 satellite, achieving a precision better than 1 cm. The high level of accuracy provides a reliable guarantee for the successful implementation of the GF3A scientific mission. [ABSTRACT FROM AUTHOR]

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Copyright of Coal Geology & Exploration is the property of Xian Research Institute of China Coal Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Metal Working (1674-165X) is the property of Metal Working Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Chinese Journal of Explosives & Propellants is the property of Chinese Journal of Explosives & Propellants Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Explosives & Propellants is the property of Chinese Journal of Explosives & Propellants Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Science & Technology of Food Industry is the property of Science & Technology of Food Industry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To observe the systemic reactions (SRs) associated with subcutaneous immunotherapy (SCIT) using dust mite allergen and to analyze potential risk factors. Methods The occurrence of SRs among 230 patients with allergic rhinitis (AR) who received house dust mite SCIT from December 2019 to December 2022 was retrospectively analyzed, and related risk factors were identified. Results A total of 5 422 injections were given to 230 patients, with an SRs incidence rate of 2.4% per injection and 20.0% per patient. Most SRs were grade I (51.9%), and no fatal SRs occurred. Symptoms primarily affected the respiratory system for 111 times (84.7%). Elevated peripheral blood eosinophil count (OR (95% CI)=6.02 (1.76, 20.60), P = 0.004) and high levels of house dust mite-specific IgE (OR (95% CI)=1.01 (1.00, 1.01), P = 0.016) were identified as risk factors for SRs, respectively. Conclusions Children with AR allergic to dust mites may experience SRs during SCIT with standardized dust mite allergen preparations, whereas the overall safety of SCIT is good. High eosinophil count and high levels of house dust mite-specific IgE are risk factors for SRs during SCIT. [ABSTRACT FROM AUTHOR]

With the development of social industrialization, energy issues have become a hot topic at present. Traditional lithium-ion batteries, due to their poor safety and high cost, cannot meet the current application needs in the energy storage field in the long term. Therefore, the development of suitable new energy has aroused people's deep thinking. Aqueous zinc-ion batteries (AZIBs) have attracted attention from the scientific research community in recent years due to their high safety, cleanliness, and other advantages. However, dendrites are easily grown on the zinc anode, and free water molecules can also corrode the zinc anode, causing side reactions such as hydrogen evolution and passivation, seriously affecting the long-term cycling performance and stability of the battery. This work introduces a new type of ionic liquid additive 1-cyanobutyl-3-methylimidazole chloride (MCBI) to optimize aqueous electrolytes. Before the deposition of zinc ions on the anode surface, MCBI cations will preferentially land on the anode. Due to their special structures of Electron-withdrawing group and nitrogen heterocycles, they will tightly adsorb on the zinc surface in a unique shape of the “Check mark” posture. This provides abundant sites for the deposition of zinc ions, allowing zinc atoms to arrange regularly between MCBI ions, thereby reducing the generation of dendrites. Due to the steric hindrance effect, by-products (Zinc hydroxide sulfate) will also accumulate in an orderly manner around additive ions, forming channels for uniform deposition of zinc ions; The hydrophobic alkyl groups of MCBI cations will repel most of the free water molecules outside the anode, thereby reducing hydrogen evolution reaction (HER). In this work, under the optimal concentration conditions, the Coulomb efficiency of Zn//Cu asymmetric cell with MCBI additive can reach 99. 37% after 200 cycles; Zn//Zn symmetric batteries can stably cycle for more than 1600 h at low current density (0. 5 mA/cm2), and can cycle for more than 1000 h at 10 mA/cm², 5 mA·h/cm². Finally, VO2 as the cathode maintains a high-capacity retention rate of 88. 5% after 500 cycles in the full battery. This work provides new ideas for the anode modification strategy of aqueous zinc ion batteries. [ABSTRACT FROM AUTHOR]

A total of 52 patients with OP and lumbar fracture (the fracture group) and 104 patients with OP without lumbar fracture (the non-fracture group) were selected as study subjects. The correlation between lumbar bone mineral density measured by QCT and serum procollagen type I C-propeptide (P1CP), N-terminal mid-fragment of osteocalcin (N-MID) and beta collagen degradation products (β-CTX) was analyzed. Logistic regression analysis was conducted to identify influencing factors of lumbar fracture. A prediction model was constructed and its predictive value was analyzed. Results Compared with the non-fracture group, the proportions of females and patients with fall history, β-CTX level and vitamin D/ calcium medication history were higher in the fracture group, and lumbar bone mineral density measured by lumbar QCT, P1CP and N-MID levels were lower (P＜0.05). Pearson correlation analysis found that lumbar bone mineral density measured by QCT was positively correlated with serum levels of P1CP and N-MID, and negatively correlated with β-CTX (r=0.523, 0.506, -0.536, P＜0.05). Multivariate Logistic regression analysis found that higher lumbar bone mineral density measured by QCT, P1CP, N-MID and history of taking vitamin D/calcium were protective factors for lumbar fracture, and igher β-CTX level was a risk factor (P＜0.05). The sensitivity and specificity of the prediction model constructed based on Logistic regression analysis results for predicting lumbar fracture were 84.62% and 97.12%. The area under the curve was 0.926 (95%CI: 0.873- 0.962). The prediction model had good calibration, and the agreement rate was 0.910. Conclusion OP patients with higher levels of QCT, P1CP and N-MID, and lower level of β-CTX have lower risk of lumbar fracture. Vitamin D and calcium can effectively prevent the occurrence of lumbar fracture in OP patients, especially in women [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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To solve the problems of low accuracy and high false detection rate of current defect detection algorithms for printed circuit board (PCB) bare board,an improved YOLO-PCB defect detection algorithm was proposed. Based on YOLOv5s algorithm, the new algorithm integrates attention mechanism to enhance the channel features of feature map. At the same time, the feature fusion layer was improved by introducing the weighted bidirectional feature pyramid network, which enabled the network to achieve higher-level feature fusion. In addition, the new algorithm added a small target detection layer to improve the network's detection capability for small target defects on the printed circuit board. The experimental results show that compared with the original YOLOv5 algorithm, the YOLO-PCB detection algorithm has stronger feature extraction fusion capability and higher detection precision, and the new algorithm improves the mAP0. 5 by 4. 08%, the mAP0. 5:0. 95 by 56. 69%, the precision by 1. 81%, and the recall by 6. 76% . [ABSTRACT FROM AUTHOR]

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