Supernova remnants (SNRs) are believed to play an important role in the acceleration of Galactic cosmic rays. The supernova ejecta are found to have a composition that is different from that of the surrounding interstellar medium, and the charged particles are accelerated by the shock front. Due to their large size and high luminosity, SNRs are easily detectable in the radio and X-ray band, and their nonuniform shapes and sizes have been revealed by radio and X-ray observations. There is evidence that the overall physical properties of SNRs evolve with time and that the embedded SNR shocks are gradually decelerated by the interstellar medium. To determine the full SNR evolution from shock dynamics to radio-emission properties, we have constructed hydrodynamic simulations to investigate the growth of SNR shocks and the distribution of postshock pressure in two cases: a large SNR and a small SNR. For comparison, the observed properties of a number of SNRs were also studied. Comparing the model with the observations of SNRs, the following results were obtained. 1) The evolution of the large SNR shock is slower and lasts longer than that of the small SNR shock. 2) In the later stages of the SNR evolution, the shock fronts evolve into a series of dense knots with a number of low-density holes. 3) The evolution of the shock evolution is not sensitive to the initial SNR size. 4) The detailed radio-emission properties of SNRs are also well reproduced by the simulations.
Suprascapular nerve entrapment by herniated material at the suprascapular nerve (SSN) is a relatively common injury. Stable lesions may be managed with conservative treatment, whereas unstable lesions are typically managed with surgical decompression. The primary goal of surgical decompression is to relieve patient symptoms and return to normal activity. However, there is no consensus regarding the surgical approach. The optimal approach has been debated and includes a posterior or combined posterior and anterior approach. This article will review the literature on these approaches and summarize the current evidence for one surgical approach over another.
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One of the drawbacks to this approach was that we needed to recompile every time we made even a small change to the code. This slowed everything else we were doing down and because we couldn't always have someone waiting for the application to finish building. 827ec27edc