Abstract We describe results of a planetary defense exercise conducted during the close approach to Earth by near-Earth asteroid (99942) Apophis 2020 December–2021 March. The community has been conducting observational campaigns since 2017 test operational readiness global capabilities. These community-led exercises were carried out with support NASA’s Planetary Defense Coordination Office and ...

During the early stages of an impact a small amount material may be jetted and ejected at speeds exceeding velocity. Jetting is important process for producing melt during relatively low velocity impacts. How angle affects jetting has yet to fully understood. Here, we simulate oblique impacts using iSALE shock physics code. Assuming both target impactor have same composition (dunite), examine w...

Advances in manufacturing emphasize on the development of sustainable and green processes. Welding is a popular process practiced worldwide. The paper presented here describes new covered electrode for shielded metal arc welding (SMAW) wherein nano-sized calcium titanate (CaTiO3) powder was used as an stabilizer, replacing conventional micro sized CaTiO3 flux. effect this flux modification mass...

Around 560 000 workers in Great Britain are potentially exposed to respirable crystalline silica (RCS), which can cause disabling diseases, such as silicosis and lung cancer. These experiments assessed the performance of a new Raman spectroscopy method for measuring RCS, samples pure quartz powder with different median aerodynamic particle diameters stone dusts from variety natural artificial s...

A simple and novel method for the direct determination of 2-deoxy D-glucose (2DG) is developed, using a hydrophilic interaction chromatography (HILIC) and evaporative light scattering detection (ELSD). Altech Altima HP HILIC column (250 x 4.6 mm, 5μ particles) was used along with the mobile phase consisted of water and acetonitrile in a linear inverse gradient elution. The proposed method is ca...

Article history: Received 31 March 2016 Received in revised form 28 February 2017 Accepted 3 March 2017 Available online 6 March 2017 Detailed aerosol knowledge is essential in numerous applications, including risk assessment in nuclear industry. Cascade impactor sampling of uranium aerosols in the breathing zone of nuclear operators was carried out at a nuclear fuel fabrication plant. Collecte...

Recent developments in neuron recording techniques include the invention of some fragile electrodes. The fragility of these electrodes impedes their successful use in deep brain recordings because it is difficult to penetrate the electrodes through the dura mater, especially the tentorium cerebelli (TC) enclosing the cerebellum and brain stem. This paper reports a new method to pierce the TC fo...

Five major sources for the ambient aerosol in Gainesville, FL were sampled by using a MicroOrifice Uniform Deposit Impactor (MOUDI) and a University of Washington Mark III Cascade Impactor. The samples were analyzed for carbons and ions. Soil dust, unpaved road dust, cement dust particles and marine aerosols were mainly in the coarse mode, while particles from transportation showed a bi-modal o...