As a critical step in moiré tomography, the extraction of phase information directly impacts the accuracy and resolution of the results. In this study, an adaptive wavelet basis frequency selection method is prop...
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As a critical step in moiré tomography, the extraction of phase information directly impacts the accuracy and resolution of the results. In this study, an adaptive wavelet basis frequency selection method is proposed for extracting the phase information of moiré fringes. The theories of wavelet basis frequency selection are derived based on the moiré fringe intensity distribution, followed by numerical simulations that demonstrate the feasibility and reliability of our method. Subsequently, validation experiments are performed, in which the phase information obtained by the adaptive method is compared with that obtained by Fourier and ridge detection methods. The results indicate that the introduction of adaptive wavelet basis frequency selection demonstrates advantages in noise resistance, accuracy, and efficiency. Meanwhile, it exhibits greater adaptability and robustness to moiré fringes with different carrier frequencies. In summary, the introduction of adaptive wavelet basis frequency opens great possibilities for the precise analysis of complex optical fringes, which will expand the application potential of moiré tomography.
Altermagnetism, as a newly identified form of unconventional antiferromagnetism, enables the removal of spin degeneracy in the absence of net magnetization that provides a platform for the low power consumption and ul...
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Public attitudes play a critical role in the successful implementation of national policies. However, there is a scarcity of systematic research presenting the Chinese public's sentiments regarding the “substitut...
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Public attitudes play a critical role in the successful implementation of national policies. However, there is a scarcity of systematic research presenting the Chinese public's sentiments regarding the “substituting plastic with bamboo” policy. With the increasing use of social media platforms for expressing views on policies, this research employs web crawler technology to collect public data from TikTok, Bilibili, and Sina Weibo, and uses statistical analysis and text mining techniques for investigation. The findings indicate that public discourse is strongly influenced by the announcement of related national policies. Commonly identified keywords in the analysis include “plastic bag,” “cut,” “chopsticks,” “moldy,” “single use,” “garbage,” and “buy.” Sentiment analysis reveals that neutral sentiments account for more than one-third of all comments, with positive sentiments marginally outnumbering the negative ones. The negative sentiments predominantly express concerns about the quality and cost of bamboo wares, environmental repercussions, and policy implementation challenges. Using Latent Dirichlet Allocation topic analysis, six key topics were identified based on Coherence and Jensen-Shannon Divergence metrics: economic environmental impact, the feasibility of substitution, impact on daily life, utilization of bamboo wares, production challenges, and policy implications. This research concludes with several policy recommendations. The insights gained from this research can assist the Chinese government and bamboo ware manufacturers in understanding market dynamics and in crafting more effective policies and strategies.
Shaoqing Wang1, Xiancun Yang2, Meixia Su1, Qiang Liu1 1Department of MRI, Shandong Medical Imaging research Institute Affiliated to Shandong University, Jinan, Shandong, 250021, People's Republic of C...
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Shaoqing Wang1, Xiancun Yang2, Meixia Su1, Qiang Liu1 1Department of MRI, Shandong Medical Imaging research Institute Affiliated to Shandong University, Jinan, Shandong, 250021, People's Republic of China; 2Department of Interventional Radiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, 250021, People's Republic of China Correspondence: Qiang Liu (2002md@***) Aims To evaluate the diagnostic value of three- dimensional rotational angiography (3D-RA) of intracranial micro-aneurysms (diameter ≤ 3 mm) and provide guidance on the value of endovascular treatment. Materials and methods 43 patients with intracranial micro-aneurysms were analyzed retrospectively, all patients had undergone angiography with both conventional 2D-DSA(Two-Dimensional Digital Subtraction Angiography) and rotational angiography with three-dimensional reconstruction; the frequency of detection of aneurysms, depiction of aneurysm neck, radiation dose, and the dosage of contrast agent were recorded respectively. Results 55 pieces of aneurysms were detected out from the 43 cases with intracranial micro-aneurysms by 3D-RA. But only 39 cases were detected out using 2D-DSA from the 55 samples, there were significant differences with regards to detection rate (P < 0.05). There were significant differences in radiation dose and dosage of contrast agent (P < 0.05) between the two methods of using 3D-RA can improve the detection rate of micro-aneurysms, which bestows obvious advantages on displaying the shape of aneurysms, the aneurysm neck at the best angle, and the relationship with the parent artery, at the same time, the amount of contrast agent and radiation dose are reduced in 3D-RA compared to 2D-DSA.
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