Aeroacoustic testing capability in both anechoic and hard-walled facilities has grown tremendously over the last decade. Such testing has provided successful collection of noise source location and directivity data in facilities such as Quiet Flow Facilities, and other subsonic, low, and high speed tunnels. One of the reasons for the success of these measurements has been the development of both phased microphone array instrumentation and robust data processing algorithms/software used in the analysis of acquired array data. While the gains using microphone arrays has been significant, several challenges must be overcome before fully realizing the potential of this technology. Most important among these challenges is the need to extend classical beam-forming techniques, incoherent monopole source theory, to more robust algorithms based on higher-order (i.e., multipole) models of the source to be measured. However, implementation of new multipole-based algorithms will require a change in thinking about how microphone arrays are constructed and operated.

Passive microwave polarimeters, or polarimetric radiometers, are important tools for Earth remote sensing. They have found utility in ocean surface wind-vector remote sensing and polarization basis rotation systems for compensating instrument or ionospheric induced rotation. The hybrid coupler-based polarimeter is a specific class of polarimeter that ultilizes a 180-degree hybrid coupler to affect a correlation between the received vertical and horizontal polarization signals. This type of polarimeter requires at least four calibration states for complete calibration. One state must be a polarized signal, such as the application of a correlated noise source. The phase balance of the noise source directly determines the quality of the calibration.

This antenna combines a rigid fixed aperture antenna with an auxiliary deployable foam aperture to greatly increase the size of the antenna. The primary improvement over prior art is the use of a polymeric foam as both the structure and the deployment mechanisms used to deploy a large reflective antenna surface.

This is an improvement over an inflatable hybrid antenna due for the following reasons:

1. The elimination of an inflation system reduces complexity, risk and mass

• No pressurant tank or gas generator is required.
  
• No plumbing is required
  
• No pressure regulation system is required storage system, .
  
• No risk of leakage caused by manufacturing defects, stowage and deployment failures, micro-meteoroid or particle impact damage.
  
• No need to control the inflation pressure over potentially large temperature variations.
  
• No need to rely on a rigidization system which typically involves distributed heaters blanketing and additional power requirements on the vehicle.

2. The use of foam enables the antenna designer to design shapes and configurations not achievable from a stressed skin inflatable system.

3. No power is consumed and no exposure to sunlight is required to stabilize or rigidize the structure once it is deployed.

4. A foam system has higher mechanical damping than an inflated system and this can be a great benefit to large structures especially when used in space.

A new and robust iodine |solid electrolyte| lithium cell has been designed, fabricated and tested.  This novel battery system possesses high theoretical capacity and is capable of operation ten to thirty times higher current densities than conventional lithium - iodine cells at room temperature.

The specific novelty of this work relates to the development of an approach for the chemical passivation of a commercially supplied solid electrolyte.  As received, the solid electrolyte possesses desirable high conductivity, bu undesirable chemical reactivity to lithium, rendering it unusable as an electrolyte in a lithium battery.  The chemical reactivity of the high conductivity solid electrolyte was found to be mitigated by the in-situ formation of a thin LiI passivation layer at the anode/electrolyte interface.