SEARCH · Search NASA
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
SrS2 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to eight equivalent S1- atoms. All Sr–S bond lengths are 3.11 Å. S1- is bonded in a 5-coordinate geometry to four equivalent Sr2+ and one S1- atom. The S–S bond length is 2.12 Å.
Brain metastases represent a major indication for stereotactic radiosurgery (SRS), but further study is needed regarding repeat SRS (SRS2) after local or marginal recurrence after prior SRS (SRS1). We report local tumor control (LC) after SRS2 and identify predictors of radiation necrosis (RN) and symptomatic RN (SRN).
In this project, we automated the production of wind roses for SRS meteorological towers. Graphics were generated for every 4-hour period of the day, for each of the 4 heights of instruments, for every half of each month. A 10-year climatological period consisted of measurements at 15-minute intervals. We used the years 2014-2024 as the wind instruments on the tower were upgraded to sonic anemometers in early 2014. We then compared these wind roses to those from a previous study done in 20031 to analyze the differences and similarities in the winds. The wind roses are used to understand environmental transport conditions at SRS2 .