thickness uniformity
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2022 ◽  
Vol 429 ◽  
pp. 127974
Author(s):  
Tiancheng Wang ◽  
Tianmin Shao ◽  
Qian Zhao ◽  
Hongfei Shang

2021 ◽  
Author(s):  
Lai Zou ◽  
Heng Li ◽  
Wenxi WANG ◽  
Yun Huang ◽  
Yutong Li

Abstract To ensure the safety and long-term performance of nuclear fuel cladding zirconium tubes, the wall thickness uniformity of each cross section is strictly needed. Therefore, this paper presents comprehensive investigations on development of an automatic ultrasonic wall thickness measurement system for detecting the nuclear zirconium tubes. Based on the determination of overall scheme, optimization of key mechanical structures and design of control system, a series of performance testing analyses of this developed auto-measuring system were performed from aspects of measuring accuracy, measuring efficiency, stability and practicability. The results revealed that it could accurately obtain the wall thickness distribution and effectively guide the subsequent grinding process by automatically generated deviation correcting procedures to achieve the requirement of the wall thickness uniformity. The new combination method of ultrasonic auto-measuring and numerical control grinding proposed in this work would have a great significance for the development and application of nuclear reaction zirconium alloy container.


2021 ◽  
Vol 8 ◽  
Author(s):  
Jason M. Acosta ◽  
Anne F. Cayron ◽  
Nicolas Dupuy ◽  
Graziano Pelli ◽  
Bernard Foglia ◽  
...  

Background: The circle of Willis is a network of arteries allowing blood supply to the brain. Bulging of these arteries leads to formation of intracranial aneurysm (IA). Subarachnoid hemorrhage (SAH) due to IA rupture is among the leading causes of disability in the western world. The formation and rupture of IAs is a complex pathological process not completely understood. In the present study, we have precisely measured aneurysmal wall thickness and its uniformity on histological sections and investigated for associations between IA wall thickness/uniformity and commonly admitted risk factors for IA rupture.Methods: Fifty-five aneurysm domes were obtained at the Geneva University Hospitals during microsurgery after clipping of the IA neck. Samples were embedded in paraffin, sectioned and stained with hematoxylin-eosin to measure IA wall thickness. The mean, minimum, and maximum wall thickness as well as thickness uniformity was measured for each IA. Clinical data related to IA characteristics (ruptured or unruptured, vascular location, maximum dome diameter, neck size, bottleneck factor, aspect and morphology), and patient characteristics [age, smoking, hypertension, sex, ethnicity, previous SAH, positive family history for IA/SAH, presence of multiple IAs and diagnosis of polycystic kidney disease (PKD)] were collected.Results: We found positive correlations between maximum dome diameter or neck size and IA wall thickness and thickness uniformity. PKD patients had thinner IA walls. No associations were found between smoking, hypertension, sex, IA multiplicity, rupture status or vascular location, and IA wall thickness. No correlation was found between patient age and IA wall thickness. The group of IAs with non-uniform wall thickness contained more ruptured IAs, women and patients harboring multiple IAs. Finally, PHASES and ELAPSS scores were positively correlated with higher IA wall heterogeneity.Conclusion: Among our patient and aneurysm characteristics of interest, maximum dome diameter, neck size and PKD were the three factors having the most significant impact on IA wall thickness and thickness uniformity. Moreover, wall thickness heterogeneity was more observed in ruptured IAs, in women and in patients with multiple IAs. Advanced medical imaging allowing in vivo measurement of IA wall thickness would certainly improve personalized management of the disease and patient care.


2021 ◽  
Vol 17 (11) ◽  
pp. 673-677
Author(s):  
Lingmao Xu ◽  
Yanchun He ◽  
Kun Li ◽  
Hui Zhou ◽  
Yuqing Xiong

2021 ◽  
Author(s):  
Daesuk Kim ◽  
Gukhyeon Hwang ◽  
Gukhyeon Hwang ◽  
Sukhyun Choi ◽  
Vamara Dembele ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4854
Author(s):  
Zakhar Vakulov ◽  
Daniil Khakhulin ◽  
Evgeny Zamburg ◽  
Alexander Mikhaylichenko ◽  
Vladimir A. Smirnov ◽  
...  

One of the significant limitations of the pulsed laser deposition method in the mass-production-technologies of micro- and nanoelectronic and molecular device electronic fabrication is the issue of ensuring deposition of films with uniform thickness on substrates with large diameter (more than 100 mm) since the area of the laser spot (1–5 mm2) on the surface of the ablated target is incommensurably smaller than the substrate area. This paper reports the methodology that allows to calculate the distribution profile of the film thickness over the surface substrate with a large diameter, taking into account the construction and technological parameters of the pulsed laser deposition equipment. Experimental verification of the proposed methodology showed that the discrepancy with the experiment does not exceed 8%. The modeling of various technological parameters influence on the thickness uniformity has been carried out. Based on the modeling results, recommendations and parameters are proposed for manufacturing uniform thickness films. The results allow for increasing the film thickness uniformity with the thickness distribution < 5% accounts for ~ 31% of 300 mm diameter substrate.


2021 ◽  
Author(s):  
Guang Yang ◽  
Dingrong Deng ◽  
Yuzhou Zhang ◽  
Qingqiang Zhu ◽  
Jiawang Cai

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