Influence of lens aperture size on spatial performance of short magnetic focusing framing camera

Optik ◽  
2020 ◽  
Vol 202 ◽  
pp. 163659
Author(s):  
Xiaodong Li ◽  
Yanli Bai
Optik ◽  
2020 ◽  
Vol 211 ◽  
pp. 164626
Author(s):  
Yanli Bai ◽  
Fuqiang Ou ◽  
Rongbin Yao ◽  
Haiying Gao ◽  
Xun Wang ◽  
...  

2019 ◽  
Vol 39 (4) ◽  
pp. 0432001
Author(s):  
姚荣彬 Yao Rongbin ◽  
白雁力 Bai Yanli ◽  
高海英 Gao Haiying ◽  
王旬 Wang Xun ◽  
刘达见 Liu Dajian

2018 ◽  
Vol 55 (7) ◽  
pp. 070401
Author(s):  
蔡厚智 Cai Houzhi ◽  
付文勇 Fu Wenyong ◽  
雷云飞 Lei Yunfei ◽  
廖昱博 Liao Yubo ◽  
刘进元 Liu Jinyuan ◽  
...  

Author(s):  
J. S. Wall ◽  
J. P. Langmore ◽  
H. Isaacson ◽  
A. V. Crewe

The scanning transmission electron microscope (STEM) constructed by the authors employs a field emission gun and a 1.15 mm focal length magnetic lens to produce a probe on the specimen. The aperture size is chosen to allow one wavelength of spherical aberration at the edge of the objective aperture. Under these conditions the profile of the focused spot is expected to be similar to an Airy intensity distribution with the first zero at the same point but with a peak intensity 80 per cent of that which would be obtained If the lens had no aberration. This condition is attained when the half angle that the incident beam subtends at the specimen, 𝛂 = (4𝛌/Cs)¼


2019 ◽  
Vol 43 (1) ◽  
pp. 15
Author(s):  
Amelya Permata Sari ◽  
M Sidik ◽  
Syntia Nusanti

Background: Graves’ ophthalmopathy (GO), also known as Graves’ orbitopathy or thyroid eye disease, has a potential sight-threatening complications. The activity and severity are important determinants in GO and are implications for treatment. Intravenous Glucocorticoid (GC) was associated with significantly greater efficacy and was better tolerated than oral route in the treatment of patients with moderate to severe and active GO. Intravenous GC has a variation cumulative dose and protocols; meanwhile the optimal treatment is still undefined. The aim of this literature review was to analyze the outcome and safety of different cumulative doses and protocols of intravenous methylprednisolone of patients with moderate to severe and active GO. Methods: The literature search was conducted from Google Scholar and Pubmed for journal articles that were published and related to the use of IVGC in moderate to severe and active GO Results: From the keywords mentioned, titles were screened for eligibility and seventeen articles were found. After being checked for the duplication, the articles were screened based on the abstracts and/or full texts. As many as eight articles met the inclusion criteria, others were excluded. Conclusion: Intravenous GC therapy in moderate to severe and active GO provide effect in reducing CAS, decreasing lid aperture size, decreasing proptosis size, and disappearing diplopia. A protocol uses a low cumulative doses (<5 g) of methylprednisolone weekly for 6 weeks and then halved dose weekly for another 6 weeks are preferred due to higher response in clinical outcome and safety profile.


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