Rotational alignment in inelastic collisions

1977 ◽  
Vol 66 (9) ◽  
pp. 4126-4132 ◽  
Author(s):  
Millard H. Alexander ◽  
Paul J. Dagdigian
Keyword(s):  
Rotational Alignment ◽  
Inelastic Collisions

scholarly journals Rotational alignment effects in NO(X) + Ar inelastic collisions: An experimental study

2013 ◽  
Vol 138 (10) ◽  
pp. 104310 ◽  
Author(s):  
M. Brouard ◽  
H. Chadwick ◽  
C. J. Eyles ◽  
B. Hornung ◽  
B. Nichols ◽  
...  
Keyword(s):  
Experimental Study ◽  
Rotational Alignment ◽  
Inelastic Collisions

scholarly journals Rotational alignment effects in NO(X) + Ar inelastic collisions: A theoretical study

2013 ◽  
Vol 138 (10) ◽  
pp. 104309 ◽  
Author(s):  
M. Brouard ◽  
H. Chadwick ◽  
C. J. Eyles ◽  
B. Hornung ◽  
B. Nichols ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Rotational Alignment ◽  
Inelastic Collisions

scholarly journals The impact of inelastic self-interacting dark matter on the dark matter structure of a Milky Way halo

2020 ◽  
Author(s):  
Kun Ting Eddie Chua ◽  
Karia Dibert ◽  
Mark Vogelsberger ◽  
Jesús Zavala
Keyword(s):  
Dark Matter ◽  
High Speed ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Direct Detection ◽  
Major Axis ◽  
Inelastic Collisions ◽  
Axis Ratio ◽  
Lower Velocity ◽  
The Impact

Abstract We study the effects of inelastic dark matter self-interactions on the internal structure of a simulated Milky Way (MW)-size halo. Self-interacting dark matter (SIDM) is an alternative to collisionless cold dark matter (CDM) which offers a unique solution to the problems encountered with CDM on sub-galactic scales. Although previous SIDM simulations have mainly considered elastic collisions, theoretical considerations motivate the existence of multi-state dark matter where transitions from the excited to the ground state are exothermic. In this work, we consider a self-interacting, two-state dark matter model with inelastic collisions, implemented in the Arepo code. We find that energy injection from inelastic self-interactions reduces the central density of the MW halo in a shorter timescale relative to the elastic scale, resulting in a larger core size. Inelastic collisions also isotropize the orbits, resulting in an overall lower velocity anisotropy for the inelastic MW halo. In the inner halo, the inelastic SIDM case (minor-to-major axis ratio s ≡ c/a ≈ 0.65) is more spherical than the CDM (s ≈ 0.4), but less spherical than the elastic SIDM case (s ≈ 0.75). The speed distribution f(v) of dark matter particles at the location of the Sun in the inelastic SIDM model shows a significant departure from the CDM model, with f(v) falling more steeply at high speeds. In addition, the velocity kicks imparted during inelastic collisions produce unbound high-speed particles with velocities up to 500 km s−1 throughout the halo. This implies that inelastic SIDM can potentially leave distinct signatures in direct detection experiments, relative to elastic SIDM and CDM.

The Adjustment of the Rotational Alignment of the Distal End of the Extramedullary Guide to the Anteroposterior Axis of the Proximal Tibia in Total Knee Arthroplasty

2021 ◽  
Author(s):  
Hideki Mizu-uchi ◽  
Hidehiko Kido ◽  
Tomonao Chikama ◽  
Kenta Kamo ◽  
Satoshi Kido ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Navigation System ◽  
Proximal Tibia ◽  
Rotational Alignment ◽  
Coronal Alignment ◽  
Ideal Position ◽  
Total Knee ◽  
Alignment Guide ◽  
The Ideal

AbstractThe optimal placement within 3 degrees in coronal alignment was reportedly achieved in only 60 to 80% of patients when using an extramedullary alignment guide for the tibial side in total knee arthroplasty (TKA). This probably occurs because the extramedullary alignment guide is easily affected by the position of the ankle joint which is difficult to define by tibial torsion. Rotational direction of distal end of the extramedullary guide should be aligned to the anteroposterior (AP) axis of the proximal tibia to acquire optimal coronal alignment in the computer simulation studies; however, its efficacy has not been proven in a clinical setting. The distal end of the guide can be overly displaced from the ideal position when using a conventional guide system despite the alignment of the AP axis to the proximal tibia. This study investigated the effect of displacement of the distal end of extramedullary guide relative to the tibial coronal alignment while adjusting the rotational alignment of the distal end to the AP axis of the proximal tibia in TKA. A total of 50 TKAs performed in 50 varus osteoarthritic knees using an image-free navigation system were included in this study. The rotational alignment of the proximal side of the guide was adjusted to the AP axis of the proximal tibia. The position of the distal end of the guide was aligned to the center of the ankle joint as viewed from the proximal AP axis (ideal position) and as determined by the navigation system. The tibial intraoperative coronal alignments were recorded as the distal end was moved from the ideal position at 3-mm intervals. The intraoperative alignments were 0.5, 0.9, and 1.4 degrees in valgus alignment with 3-, 6-, and 9-mm medial displacements, respectively. The intraoperative alignments were 0.7, 1.2, and 1.7 degrees in varus alignment with 3-, 6-, and 9-mm lateral displacements, respectively. In conclusion, the acceptable tibial coronal alignment (within 2 degrees from the optimal alignment) can be achieved, although some displacement of the distal end from the ideal position can occur after the rotational alignment of the distal end of the guide is adjusted to the AP axis of the proximal tibia.

CRASY: Correlated Rotational Alignment Spectroscopy of Pyridine. The Rotational Raman Spectrum of Pyridine and Asymmetric Fragmentation of Pyridine Dimer Cation

2021 ◽  
Author(s):  
Jong Chan Lee ◽  
Begüm Rukiye Özer ◽  
Thomas Schultz
Keyword(s):  
Raman Spectrum ◽  
Mass Spectrum ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Rotational Alignment ◽  
Strong Signal

We investigated the rotational Raman spectrum of pyridine monomer and pyridine dimer with mass-correlated rotational alignment spectroscopy (mass-CRASY) and ab initio calculations. The mass spectrum showed a strong signal for...

scholarly journals Inelastic collisions in radiofrequency-dressed mixtures of ultracold atoms

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Elliot Bentine ◽  
Adam J. Barker ◽  
Kathrin Luksch ◽  
Shinichi Sunami ◽  
Tiffany L. Harte ◽  
...  
Keyword(s):  
Ultracold Atoms ◽  
Inelastic Collisions
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