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45. 3D Measurement of Discontinuous Objects with Optimized Dual-frequency Grating Profilometry

Author

Che Jun, Sun Yanxia, Jin Xiaojun, and Chen Yong

Subjects
three-dimensional profilometry, automatic determination of blind spots, measurement of discontinuous surfaces, local height distortion correction, Mathematics, QA1-939
Abstract

Three-dimensional profilometry tends to be less effective at measuring discontinuous surfaces. To overcome this problem, an optimized profilometry based on fringe projection is proposed in this paper. Due to the limitation of the shooting angle, there are projection blind spots on the surface of discontinuous objects. Since the noises and unwrapping errors are always localized at the projection blind spots, an algorithm is designed to determine the blind spots automatically with the light intensity difference information. Besides, in order to improve the measurement accuracy, a processing scheme is introduced to deal with the local height distortion introduced by the dual-frequency grating profilometry. Lots of measurement tests on various surfaces are carried out to assess the optimized profilometry, and experimental results indicate that the modified profilometry system works more robust with high reliability and accuracy in measuring different kinds of surfaces, especially discontinuous ones.

Published
2021
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47. Morphological, Physiological, and Photosynthetic Differences of Tartary Buckwheat Induced by Post-Anthesis Drought.

Author

Yuan, Hang, Wang, Qiang, Qi, Anyin, Li, Shuang, Hu, Yan, Hu, Zhiming, Guo, Laichun, Liang, Chenggang, Li, Wurijimusi, Liu, Changying, Sun, Yanxia, Zou, Liang, Peng, Lianxin, Xiang, Dabing, Liu, Cheng, Huang, Jingwei, and Wan, Yan

Subjects
NUTRITIONAL value, DROUGHTS, DROUGHT tolerance, POLYPHENOLS, PROLINE, BUCKWHEAT
Abstract

Tartary buckwheat (Fagopyrum tataricum (L.) Gaertn) is a crop of significant interest due to its nutritional value and resilience to drought conditions. However, drought, particularly following flowering, is a major factor contributing to yield reduction. This research employed two distinct Tartary buckwheat genotypes to investigate the effects of post-anthesis drought on growth and physicochemical characteristics. The study aimed to elucidate the response of Tartary buckwheat to drought stress. The findings indicated that post-anthesis drought adversely impacted the growth, morphology, and biomass accumulation of Tartary buckwheat. Drought stress enhanced the maximum photosynthetic capacity (Fv/Fm) and light protection ability (NPQ) of the 'Xiqiao-2' genotype. In response to drought stress, 'Dingku-1' and 'Xiqiao-2' maintained osmotic balance by accumulating soluble sugars and proline, respectively. Notably, 'Xiqiao-2' exhibited elevated levels of flavonoids and polyphenols in its leaves, which helped mitigate oxidative damage caused by drought. Furthermore, rewatering after a brief drought period significantly improved plant height, stem diameter, and biomass accumulation in 'Dingku-1'. Overall, 'Xiqiao-2' demonstrated greater long-term tolerance to post-anthesis drought, while 'Dingku-1' was less adversely affected by short-term post-anthesis drought. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Association between influenza vaccination and one‐year all‐cause and cardiovascular mortality risk: A self‐controlled case series and matched case‐control study.

Author

Ma, Yuan, Li, Wei, Li, Juan, Qian, Jie, Jiang, Mingyue, Sun, Yanxia, Ma, Yue, Yang, Weizhong, and Feng, Luzhao

Subjects
INFLUENZA vaccines, MORTALITY, CARDIOVASCULAR diseases risk factors, CASE-control method, INFLUENZA, H7N9 Influenza
Abstract

Debates surrounding the efficacy of influenza vaccination for survival benefits persist, and there is a lack of data regarding its duration of protection. A self‐controlled case series (SCCS) and a 1:4 matched case‐control study were conducted using the National Health Interview Survey (NHIS) and public‐use mortality data from 2005 to 2018 in the United States. The SCCS study identified participants who received influenza vaccination within 12 months before the survey and subsequently died within 1 year of postvaccination. The matched case‐control study paired participants who died during the influenza season at the time of survey with four survivors. Among 1167 participants in the SCCS study, there was a 46% reduction in all‐cause mortality and a 43% reduction in cardiovascular mortality within 29–196 days of postvaccination. The greatest protection was observed during days 29–56 (all‐cause mortality: RI: 0.19; 95% CI: 0.12–0.29; cardiovascular mortality: RI: 0.28; 95% CI: 0.14–0.56). Among 626 cases and 2504 controls included in the matched case‐control study, influenza vaccination was associated with a reduction in all‐cause mortality (OR: 0.74, 95% CI: 0.60–0.92) and cardiovascular mortality (OR: 0.64, 95% CI: 0.44–0.93) during the influenza season. This study highlights the importance of influenza vaccination in reducing the risks of all‐cause and cardiovascular mortality, with effects lasting for approximately 6 months. [ABSTRACT FROM AUTHOR]

Published
2024
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