Manipulator system man-machine interface evaluation program

Application and requirements for remote manipulator systems for future space missions were investigated. A manipulator evaluation program was established to study the effects of various systems parameters on operator performance of tasks necessary for remotely manned missions. The program and laboratory facilities are described. Evaluation criteria and philosophy are discussed

Descriptive Analyses of Pollen Surface Morphologies in the Model Systems Brassica Rapa and Arabidopsis Thaliana and Three Arabidopsis Pollen Wall Mutants By Scanning Electron Microscopy

The mechanisms behind the construction of the pollen wall are equally elaborate and mysterious. Previous studies primarily used sectioned tissue to elucidate the events involved in proper pollen development. This study proposed and evaluated a protocol for exposing developing microspores to be examined by Scanning Electron Microscopy (SEM). Utilizing this protocol, comparative analyses of the superficial features present at the early, middle, and late tetrad as well as at released microspore stages of the model plants Brassica rapa and Arabidopsis thaliana were conducted. The utility of the technique was then evaluated through the examination of three Arabidopsis pollen wall mutants at multiple developmental stages. The defective in exine formation 1, callose synthase 5-2 and thin exine 2-2 mutant lines are known to exhibit defective exine patterning. The dex1 mutant demonstrates abnormal sporopollenin deposition where aggregates form and coalesce randomly on the microspore surface (Paxson-Sowders et al. 1997). The cals5-2 mutant exhibits aberrant callose synthesis at the microsporocyte stage leading to deposition of globular aggregates and improper exine formation (Dong et al. 2005). The tex2-2 mutant was characterized by the presence of an extremely thin mature exine that lacks patterning (Dobritsa et al. 2011). In addition, this study aimed to further elucidate the role of DEX1 in pollen wall development through indirect immunocytochemistry of developing microsporocytes and tetrad microspores as well as understand how the distribution of this protein may differ in known pollen wall mutants. The methods developed in this study proved effective and allowed for observation of the entire surface of developing microspores with high resolution and three-dimensional qualities. These protocols provided new information in the characterization of pollen wall development in both normal and mutant plants. In addition, it revealed unique features and characteristics of sporopollenin deposition and exine development not readily observed in sectioned tissue nor explicitly described in conventional literature

Cold War Operations: The Politics of Communitst Confrontation

Africa has been a turbulent continent m the 1960\u27s. While six new nations were born in the 1950\u27s--Libya in 1952, Sudan in 1955, Tunis and Morocco in 1956, Ghana in 1957, and Guinea in 1958-the year 1960 saw an explosion of new nations with 17 gaining independence, and II more have been added since

Cold War Operations: The Politics of Communist Confrontation, Part V - The Cuban Case History

A series of eight lectures by Professor Lyman B. Kirkpatrick of the Political Science Department, Brown University, given at the United States Naval War College during the 1966-67 term as a part of the Electives Program

Cold War Operations: The Politics of Communist Confrontation, Part VI: Vietnam

A series of eight lectures by Professor Lyman B. Kirkpatrick of the Political Science Department, Brown University, given at the United States Naval War College during the 1966-67 term as a part of the Electives Program

Cold War Operations: The Politics of Communist Confrontation, Part IV — The Communist Control System

A series of eight lectures by Professor Lyman H. Kirkpatrick of the Political Science Department, Brown University, given at the United States Naval War College during the 1966-67 term as a part of the Electives Program

Cold War Operations: The Politics of Communist Confrontations

A series of eight lectures by Professor Lyman B. Kirkpatrick of the Political Science Department, Brown University, given at the United States Naval War College during the 1966-67 term as a part of the Electives Program

Insurgency: Origins and the Nature of the Beast

Insurgency is either endemic or epidemic in the world today and will continue into the foreseeable future—certainly until some new form of stability is reached or man no longer inhabits the planet

An exactly solvable toy model that mimics the mode coupling theory of supercooled liquid and glass transition

A toy model is proposed which incorporates the reversible mode coupling mechanism responsible for ergodic-nonergodic transition with trivial Hamiltonian in the mode coupling theory (MCT) of structural glass transition. The model can be analyzed without relying on uncontrolled approximations inevitable in the current MCT. The strength of hopping processes can be easily tuned and the ideal glass transition is reproduced only in a certain range of the strength. On the basis of the analyses of our model we discuss about a sharp ergodic-nonergodic transition and its smearing out by "hopping".Comment: 5 pages, 2 ps-figures, inappropriate terms replace