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121 results on '"Haefner K"'

12. Fluidic emergency roll control system

Author

Haefner, K. B and Honda, T. S

Subjects
Aircraft
Abstract

A fluidic emergency roll control system for aircraft stabilization in the event of primary flight control failure was evaluated. The fluidic roll control units were designed to provide roll torque proportional to an electrical command as operated by two diametrically opposed thrust nozzles located in the wing tips. The control package consists of a solid propellant gas generator, two diametrically opposed vortex valve modulated thrust nozzles, and an electromagnetic torque motor. The procedures for the design, development, and performance testing of the system are described.

Published
1973

16. Spontaneous Lethal Sectoring, a Further Feature of Escherichia coliStrains Deficient in the Function of recand uvrGenes

Author

Haefner, K.

Abstract

Eight recombination-deficient (Rec−) mutants of Escherichia coliwere studied. Progeny lines were obtained on solid media, by means of micromanipulation, and the colony-forming ability of individual cells was analyzed. Cells of all eight strains gave rise to colony-forming as well as non-colony-forming descendants (“lethal sectoring”). Lethal sectors, i.e., groups of non-colony-forming cells which originate from a common ancestor, appeared with frequencies per generation ranging between 4 and 20% in Rec−strains, whereas lethal sectors were rare in Rec+strains (less than 1%). A strain carrying a mutation (uvrA6) in one of the genes involved in pyrimidine dimer excision from deoxyribonucleic acid (DNA) showed twice as many lethal sectors per generation as a strain with the genotype uvrA+. Similarly, a double mutant (AB2480, uvrA6, recA13) showed twice as much spontaneous lethal sectoring as the corresponding Rec−strain (uvrA+, recA13). The kinetics of growth curves obtained in nutrient broth and the frequency of non-colony-forming units in stationary-phase broth cultures indicate clearly that lethal sectors occur in liquid cultures too. The causes for spontaneous lethal sectoring are unknown at present. It seems reasonable to assume that gene uvrAand the recgenes are somehow involved in the repair of spontaneously occurring DNA lesions, since a deficiency in this type of repair may cause lethal sectors. The extent to which spontaneous lethal sectoring (observed in all Rec−strains of E. colistudied) may contribute indirectly to the failure to form recombinants is discussed.

Published
1968
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31. Lernersteuerung im RGU: Erste Erfahrungen mit LEGIS

Author

Bode, Arndt, Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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33. Unterstützung eines Ulmer Schulversuches durch EDV

Author

Neumann, Dietmar, Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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34. Simulationen Im Plato system

Author

Eichmann, E. H., Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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35. CAI activities in Switzerland

Author

Frei, H. P., Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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37. Artificial intelligence methoden im CUU

Author

Laubsch, Joachim H., Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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38. Computers and instruction: A five-year research program

Author

Hansen, Duncan, Thurmond, Paul, Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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45. Daten aus Effizienzuntersuchungen an CUU-Courseware

Author

Schablowski, Peter, Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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46. Probe: A computer-based mastery learning system

Author

McMullen, David W., Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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47. Design strategy for learner-controlled courseware

Author

Bunderson, C. Victor, Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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49. A college-level CAI course in basic

Author

Barr, Avron, Beard, Marian, Lorton, Paul, Jr., Atkinson, Richard C., Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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50. A study of children's programming

Author

Cannara, Alexander B., Weyer, Stephen A., Goos, G., editor, Hartmanis, J., editor, Brinch Hansen, P., editor, Gries, D., editor, Moler, C., editor, Seegmüller, G., editor, Wirth, N., editor, Brunnstein, K., editor, Haefner, K., editor, and Händler, W., editor

Published
1974
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