curvature correction
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2021 ◽  
pp. 205141582110593
Author(s):  
Pankaj M Joshi ◽  
Marco Bandini ◽  
Guido Barbagli ◽  
Manuel Hevia ◽  
Francesco Montorsi ◽  
...  

Background: To lift the neurovascular bundle (NVB) is a critical step during dorsal plications for ventral penile curvature correction. Indeed, this procedure may hesitate in nerves and vascular damage. Herein, we present a revolutionary approach of partial NVB mobilisation that avoids dissection among 10 and 2 o’clock positions decreasing the risk of injuring nerves and vessels. Methods: We assessed ventral penile curvature after penile degloving, marking the level of maximal bending. Bilateral para urethral incisions were made and the Buck’s fascia carefully mobilised from the tunica albuginea. The mobilisation of NVB was carried until 10 and 2 o’clock, avoiding the area between 10 and 2 o’clock positions, where nerves and vessels are more concentrated. The 10 and 2 o’clock positions correspond also to the dorsal edges of the two cavernosa cylinders, where plications are more effective. Penile straightening after surgery was defined as residual curvature less than 10 degrees. Results: Between 2016 and 2020, we have operated 33 men and 32 boys with ventral penile curvature. The severity of penile curvature was mid (<30 degrees) in 13 (20%) patients, moderate (30–60 degrees) in 33 (51%) patients, and severe (> 60 degrees) in 19 (29%) patients. Penile straight was achieved for all patients. We recorded three haematoma, three glans skin erosion, and one curvature recurrence after 13 months of follow-up. No patient reported erectile dysfunction. Conclusion: This proof-of-concept study shows that partial NVB mobilisation is technically easier and safer compared to complete NVB mobilisation, without compromising the success of surgery. Level of evidence: Not applicable


2021 ◽  
Vol 43 ◽  
pp. 45-57
Author(s):  
Mohammed Nebbache ◽  
Abdelkader Youcefi

Using the appropriate procedure, Computational Fluid Dynamics allows predicting many things in several fields, and especially in the field of renewable energies, which has become a promising research axis. The present study aims at highlighting the influence of the curvature correction on turbulence models for the prediction of the aerodynamic coefficients of the S809 airfoil using the Computational Fluid Dynamics code ANSYS Fluent 17.2. Three turbulence models are used: Spalart-Allmaras, Shear Stress Transport k-ω and Transition SST. Experimental results of the 1.8 m × 1.25 m low-turbulence wind tunnel at the Delft University of Technology are used in this work for comparison with the numerical results for a Reynolds number of 106. The results show that the use of the curvature correction improves the prediction of the aerodynamic coefficients for all the turbulence models used. A comparison of the three models is also made using curvature correction since it gave better results. The Transition SST model is the one that gives the best results for the lift coefficient, followed by the Shear Stress Transport kω model, and finally the Spalart-Allmaras model. For the drag coefficient, Transition SST model is the best, followed by the Spalart-Allmaras model, and finally the Shear Stress Transport kω model.


2021 ◽  
Vol 2127 (1) ◽  
pp. 012069
Author(s):  
A V Kryukov ◽  
S V Yakubovskiy

Abstract The research presents a method to synthesize lens data of an air meniscus built into the optical layout and acting as a correction element that fixes the field curvature of the entire optical system. The practical application of the proposed method is relevant when creating miniature lenses for medical video endoscopes when a small number of lenses and a flat image field for a CCD/CMOS sensor are important. Analytical dependencies for the lens data of the air meniscus are obtained and significant conditions for the field curvature correction are formed. A numerical example of a front stop lens design is demonstrated and confirms the correctness of the formulated conditions. A comparison of the aberration values of the original lens and an upgraded system is carried out. It is shown that, the values of the field curvature and astigmatism have been compensated as a result of introducing the synthesized parameters of the air meniscus into the optical layout. The correction is achieved while keeping the values of coma, distortion, focal length, and optical system total length at the level of the initial values.


2021 ◽  
Vol 26 (09) ◽  
Author(s):  
Luka Rogelj ◽  
Urban Simončič ◽  
Tadej Tomanič ◽  
Matija Jezeršek ◽  
Urban Pavlovčič ◽  
...  

Urologiia ◽  
2021 ◽  
Vol 2_2021 ◽  
pp. 74-77
Author(s):  
G.V. Kozyrev Kozyrev ◽  
D.T. Manasherova Manasherova ◽  
G.A. Abdulkarimov Abdulkarimov ◽  
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Keyword(s):  

2021 ◽  
pp. 1-1
Author(s):  
Sunghwan Joo ◽  
Tae Woo Oh ◽  
Ji-Young Kim ◽  
Sumin Lee ◽  
Byoung Mo Moon ◽  
...  

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