Line-of-sight guidance techniques for manned orbital rendezvous

Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1963.Vita.Includes bibliographical references (leaves 305-309).by Edwin Eugene Aldrin, Jr.Sc.D

Bayard Rustin: An Annotated Bibliography of Materials Relating to Rustin as a Quaker and Peace Activist

Although Bayard Rustin was one of the most important leaders of the American civil rights movement from the advent of its modern period in the 1950s until well into the 1980s, his name was seldom mentioned; he received comparatively little press or media attention, and others\u27 names were usually much more readily associated with the movement than his was. His was a behind-the-scenes role that, for all its importance, never garnered Rustin the public acclaim he deserved. Rustin\u27s homosexuality and early communist affiliation probably meant that the importance of his contribution to the civil rights and peace movements would never be acknowledged. However, fairness demands that the extent of Rustin\u27s work receive a fair public reception

Compulsory Licensing of Climate Engineering Patents: How Embracing Technology- and Research-Sharing Strategies Brings Us One Step Closer to Solving Climate Change

The impact of climate change spans the globe and includes increasingly severe and dangerous climate events, including coastal flooding, extreme heat and wildfires, reduced crop yield, and decreased food security. In the United States, if the proper steps toward mitigating or reversing the effects of climate change are not taken, it is very likely that the United States will experience substantial damage to its economy, the health of its citizens, and the environment. In response to the challenges presented by climate change, the number of inventions in the field of climate engineering, or “geoengineering,” has skyrocketed over the past several years, and the number of patent applications and grants for technologies in that field has similarly increased dramatically

Apollo and Beyond

The orbiter medium has a pod that can be ejected from the pad or from anywhere in flight. The essence of that ejectable pod and its capacity and its systems could also be used as a lifeboat, similar to the X-38. The orbiter medium, when boosted by one booster, goes into low-Earth orbit. With two boosters and a tank, it can then rendezvous with things at the L-1 port. The L-1 port really comes from the habitable volumes that are put up. We would envision looking at a prototype during this period and actually launching one before the end of the year 2008 into the space station orbit of the International Space Station, where it could supplement what we think is a desirable thing . . . an orbiter on station. Owen Garriott, who flew on Skylab, has been pioneering the activity of long-duration orbiters that could be left at the Station and relieved on Station by another orbiter, thereby relieving the burden of having to rely on the lifeboat Soyuz and a half module, both of which have been sort of postponed now by NASA because of cost overruns. The booster large now is a fly-back booster for the Shuttle, and two of those go with the Shuttle system as it proceeds toward phase out. One large booster launches an orbiter large into low-Earth orbit for Space Shuttle transportation two into the future. With two boosters and a tank, it can then go to high orbits, which means it can intercept cycling space ships. Cycling space ships are a derivative of what we first put at the 51.6-degree inclination and then work close to the International Space Station, perhaps take the nose section of the tank and put it actually on the ISS as a larger half module than we plan to do right now

Effect of Phase Delay on Low Frequency Operation of Flux Focusing Eddy Current Probe

The operation of the Flux Focusing Eddy Current Probe has been found to yield critical information on the thickness of the material being inspected [1–2]. The design of the probe forces the low frequency magnetic fields to diffuse through the sample in order to link with the pickup coil. An attenuation of the magnetic field results such that the pickup coil output is inversely related to the material thickness [2]. In extending the technique to thicker and/or layered materials, however, an apparently anomalous behavior is sometimes seen in which a small increase in the probe output occurs with increasing material thickness. This paper will clarify the underlying principles involved with the probe during low frequency operation and explain the apparent anomaly in terms of the phase shifting of the magnetic field with diffusion depth. A phasor addition model will be presented which accounts for the observed experimental results, and implications of the phenomena on material testing will be discussed

Application of Eddy Current Techniques for Orbiter Reinforced Carbon-Carbon Structural Health Monitoring

The development and application of advanced nondestructive evaluation techniques for the Reinforced Carbon-Carbon (RCC) components of the Space Shuttle Orbiter Leading Edge Structural Subsystem (LESS) was identified as a crucial step toward returning the shuttle fleet to service. In order to help meet this requirement, eddy current techniques have been developed for application to RCC components. Eddy current technology has been found to be particularly useful for measuring the protective coating thickness over the reinforced carbon-carbon and for the identification of near surface cracking and voids in the RCC matrix. Testing has been performed on as manufactured and flown RCC components with both actual and fabricated defects representing impact and oxidation damage. Encouraging initial results have led to the development of two separate eddy current systems for in-situ RCC inspections in the orbiter processing facility. Each of these systems has undergone blind validation testing on a full scale leading edge panel, and recently transitioned to Kennedy Space Center to be applied as a part of a comprehensive RCC inspection strategy to be performed in the orbiter processing facility after each shuttle flight

Parallel RNAi screens across different cell lines identify generic and cell type-specific regulators of actin organization and cell morphology

Parallel RNA interference screens and gene expression arrays in six Drosophila cell lines identified regulators of cell morphology, including a neuronal function for the kinase minibrain/DYRK1A in the regulation of protrusion morphology