Fullerene Irradiation Leads to Track Formation Enclosing Nitrogen Bubbles in GaN Material

2020 ◽  
Author(s):  
JG Matteia ◽  
M. Sall ◽  
F. Moisy ◽  
A. Ribet ◽  
E. Balanzat ◽  
...  
Keyword(s):  
Track Formation ◽  
Nitrogen Bubbles

scholarly journals Fullerene irradiation leading to track formation enclosing nitrogen bubbles in GaN material

Materialia ◽  
2021 ◽  
Vol 15 ◽  
pp. 100987
Author(s):  
J.G. Mattei ◽  
M. Sall ◽  
F. Moisy ◽  
A. Ribet ◽  
E. Balanzat ◽  
...  
Keyword(s):  
Track Formation ◽  
Nitrogen Bubbles

Fistulous Track Formation in the Flank Associated with Foreign Body Granuloma Formed at the Ovary Pedicle in a Dog

2005 ◽  
Vol 36 (3) ◽  
pp. 63-68
Author(s):  
Misato TOGASHI ◽  
Tetsuya NAKADE ◽  
Jun NAKANISHI ◽  
Hiroyuki TANIYAMA ◽  
Tsuyoshi KADOSAWA
Keyword(s):  
Foreign Body ◽  
Foreign Body Granuloma ◽  
Track Formation ◽  
Fistulous Track

Abdominal decompression illness following repetitive diving: a case report and review of the literature

2019 ◽  
pp. 211-215
Author(s):  
Peter Beale ◽  
Levi Kitchen ◽  
W.R. Graf ◽  
M.E. Fenton ◽  
Keyword(s):  
Case Report ◽  
The Body ◽  
Decompression Illness ◽  
Review Of The Literature ◽  
Hyperbaric Chamber ◽  
Foreign National ◽  
Biochemical Effects ◽  
Elapsed Time ◽  
Nitrogen Bubbles ◽  
Abdominal Decompression

The complete pathophysiology of decompression illness is not yet fully understood. What is known is that the longer a diver breathes pressurized air at depth, the more likely nitrogen bubbles are to form once the diver returns to surface [1]. These bubbles have varying mechanical, embolic and biochemical effects on the body. The symptoms produced can be as mild as joint pain or as significant as severe neurologic dysfunction, cardiopulmonary collapse or death. Once clinically diagnosed, decompression illness must be treated rapidly with recompression therapy in a hyperbaric chamber. This case report involves a middle-aged male foreign national who completed three dives, all of which incurred significant bottom time (defined as: “the total elapsed time from the time the diver leaves the surface to the time he/she leaves the bottom)” [2]. The patient began to develop severe abdominal and back pain within 15 minutes of surfacing from his final dive. This case is unique, as his presentation was very concerning for other medical catastrophes that had to be quickly ruled out, prior to establishing the diagnosis of severe decompression illness. After emergency department resuscitation, labs and imaging were obtained; abdominal decompression illness was confirmed by CT, revealing a significant abdominal venous gas burden.

scholarly journals Ion tracks in silicon formed by much lower energy deposition than the track formation threshold

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
H. Amekura ◽  
M. Toulemonde ◽  
K. Narumi ◽  
R. Li ◽  
A. Chiba ◽  
...  
Keyword(s):  
Nuclear Energy ◽  
Energy Deposition ◽  
Ion Irradiation ◽  
High Energy ◽  
Electronic Energy ◽  
Synergy Effect ◽  
Ion Tracks ◽  
Track Formation ◽  
Low Energies ◽  
High Energy Ions

AbstractDamaged regions of cylindrical shapes called ion tracks, typically in nano-meters wide and tens micro-meters long, are formed along the ion trajectories in many insulators, when high energy ions in the electronic stopping regime are injected. In most cases, the ion tracks were assumed as consequences of dense electronic energy deposition from the high energy ions, except some cases where the synergy effect with the nuclear energy deposition plays an important role. In crystalline Si (c-Si), no tracks have been observed with any monomer ions up to GeV. Tracks are formed in c-Si under 40 MeV fullerene (C60) cluster ion irradiation, which provides much higher energy deposition than monomer ions. The track diameter decreases with decreasing the ion energy until they disappear at an extrapolated value of ~ 17 MeV. However, here we report the track formation of 10 nm in diameter under C60 ion irradiation of 6 MeV, i.e., much lower than the extrapolated threshold. The diameters of 10 nm were comparable to those under 40 MeV C60 irradiation. Furthermore, the tracks formed by 6 MeV C60 irradiation consisted of damaged crystalline, while those formed by 40 MeV C60 irradiation were amorphous. The track formation was observed down to 1 MeV and probably lower with decreasing the track diameters. The track lengths were much shorter than those expected from the drop of Se below the threshold. These track formations at such low energies cannot be explained by the conventional purely electronic energy deposition mechanism, indicating another origin, e.g., the synergy effect between the electronic and nuclear energy depositions, or dual transitions of transient melting and boiling.

scholarly journals Roto-Translational Control of Spacecraft in Low Earth Orbit Using Environmental Forces and Torques

2021 ◽  
Vol 11 (10) ◽  
pp. 4606
Author(s):  
Camilo Riano-Rios ◽  
Alberto Fedele ◽  
Riccardo Bevilacqua
Keyword(s):  
Translational Control ◽  
Attitude Control ◽  
Center Of Mass ◽  
Low Earth Orbit ◽  
Gravity Gradient ◽  
Adaptive Controllers ◽  
Attitude Error ◽  
Track Formation ◽  
Relative Orbit ◽  
Along Track

In this paper, relative orbit and attitude adaptive controllers are integrated to perform roto-translational maneuvers for CubeSats equipped with a Drag Maneuvering Device (DMD). The DMD enables the host CubeSat with modulation of aerodynamic forces/torques and gravity gradient torque. Adaptive controllers for independent orbital and attitude maneuvers are revisited to account for traslational-attitude coupling while compensating for uncertainty in parameters such as atmospheric density, drag/lift coefficients, location of the Center of Mass (CoM) and inertia matrix. Uniformly ultimately bounded convergence of the attitude error and relative orbit states is guaranteed by Lyapunov-based stability analysis for the integrated roto-translational maneuver. A simulation example of an along-track formation maneuver between two CubeSats with simultaneous attitude control using only environmental forces and torques is presented to validate the controller.

Effect of alloy composition on track formation in relaxed Si1−xGex

2003 ◽  
Vol 340-342 ◽  
pp. 808-812 ◽  
Author(s):  
P.I. Gaiduk ◽  
C. Trautmann ◽  
M. Toulemonde ◽  
J. Lundsgaard Hansen ◽  
A. Nylandsted Larsen
Keyword(s):  
Alloy Composition ◽  
Track Formation
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