Experimental Activities Sample Clauses

Experimental Activities. EXOS must not conduct developmental or test flights or developmental or test operations at or from the Spaceport unless the following criteria are met:

Experimental Activities. EGX must not conduct developmental or test flights or developmental or test operations at or from the Spaceport unless the following criteria are met:

Experimental Activities. Low frequency acoustic signals in the ocean travel fast (approximately 1,500 m/sec) with little attenuation. The speed at which these signals travel through the ocean varies with changes in temperature, salinity, pressure, and currents as they propagate through different water masses. Thus, the signal travel time can measure the water temperature and current of the ensonified water volume, when used in conjunction with appropriate signal processing techniques (e.g., inversion schemes) (Munk et al. 1995). This is the fundamental principle of acoustic tomography, which can provide measurements of internal ocean temperatures to an accuracy of 0.001ºC over a 200 km (108 nmi) range (Munk et al. 1995). To measure water mass properties this way, two-way travel times are necessary, which require a minimum of two transceivers in the tomography array. Acoustic tomography can be used in any oceanic area, including very deep and ice-covered regions. The ACOBAR Experiment deployed equipment in August 2010. Three ACOBAR tomography system moorings were deployed in Fram Strait, including three Xxxx Research Corporation (WRC) sources, one located at each corner of the experiment area, and one STAR receiver array deployed in the approximate center of the experiment area (Table 1-1; Figure 1-1). The WRC sources transmitted tomographic and RAFOS signals while deployed (Table 1-2). The STAR receiver array deployed in 2010 remained operational until 2011, when it was retrieved and a second STAR receiver array was deployed in roughly the same area (Table 1-1). The tomography system collected data for two years. Two of the three WRC sources (transceivers) and the STAR array were recovered in September 2012. The third WRC source has not been recovered yet. After approximately two weeks of successful transmissions, its transmissions were no longer received. It is believed that the subsurface buoy holding the mooring in the water column collapsed and the mooring fell to the ocean floor. Attempts will be made to dredge the sea floor in the area and attempt to locate and recover the mooring during the summer of 2013. With the exception of standard expendable oceanographic equipment and expendable mooring lines and anchors, all other equipment, arrays, and sources were retrieved from their moorings upon conclusion of the experiment’s data collection.