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Analytical solution for extensible tethers (1974)

Eades, J. B., Jr.

In: Other Sources

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Publication Date: 2019-06-27

Description: The mathematical model considers a large particle (m sub 1), such as a space station, and a smaller particle (m sub 2), connected by an ideal, massless tether, i.e., one incapable of sustaining other than tensile loads. The problem situation described offers a practical solution which should be quite useful in certain space flight operations, especially for the transfer of cargo and personnel and for retrieval and rescue operations. The idea is simple in its application and does not appear to require sophisticated hardware. An appealing advantage is that it is infinitely reusable, i.e., it could be rewound and used over and over again.

Keywords: PHYSICS, GENERAL

Type: Journal of Spacecraft and Rockets; 11; Apr. 197

Format: text

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2

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A control system for orbiting tethered-body operations (1975)

Eades, J. B., Jr.

In: Other Sources

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Publication Date: 2019-07-13

Description: This paper shows that through proper control logic the transfer of men and cargo between spacecrafts, or the 'positioning of packages' adjacent to orbiters, can be accomodated safely and predictably using tethers. Also, these systems may be adapted to rescue and retrieval operations where 'controlled motions' must be maintained. Shown here is a method which illustrates how tethered-body motions are controlled for 'reel-in' and 'reel-out' operations, and for precise 'positioning' purposes. Three control modes are examined; from these are derived sets of universal control parameters capable of predescribing systems of similar types. In addition, these parameters form a basis for designing tethered-body systems and operations.

Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE

Type: International Federation of Automatic Control, Triennial World Congress; Aug 24, 1975 - Aug 30, 1975; oston; US

Format: text

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3

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Collisional quenching of metastable states of antiprotonic helium by hydrogen and deuterium molecules (2001)

Ketzer, B. ; von Egidy, T. ; Hartmann, F.J. ; [et al.]

Springer

The European physical journal 13 (2001), S. 305-316

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ISSN: 1434-6079

Keywords: PACS. 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles) – 42.62.Fi Laser spectroscopy – 34.20.Gj Intermolecular and atom-molecule potentials and forces

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: The quenching of metastable states of antiprotonic helium by collisions with hydrogen and deuterium molecules was studied. A systematic investigation of the delayed annihilation time spectra at various H2 and D2 admixture ratios at the ppm level revealed characteristic changes of their shape, which indicated a strong principal and orbital quantum number dependent quenching of levels in both cases. Applying a laser spectroscopy technique to measure the lifetimes of individual states and cascades we deduced H2 and D2 quenching cross-sections for the states (n, l )= (39, 35) and (37, 34). These cross-sections establish for D2 molecules the strong increase of the quenching efficiency with increasing principal quantum number n of the state under investigation previously reported for the case of H2 admixtures. Our experiments indicate that the low-n state (37, 34) is somewhat less affected by D2 than by H2, while the high-n state (39, 35) is equally quenched by both isotopes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100530170246

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4

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Quenching of metastable antiprotonic helium atoms in collisions with deuterium molecules (2002)

Juhász, B. ; Eades, J. ; Hayano, R.S. ; [et al.]

Springer

The European physical journal 18 (2002), S. 261-266

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ISSN: 1434-6079

Keywords: PACS. 36.10.-k Exotic atoms and molecules (containing mesons, muons, and other unusual particles) – 42.62.Fi Laser spectroscopy – 34.20.Gj Intermolecular and atom-molecule potentials and forces

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: Quenching of metastable antiprotonic helium atoms in collisions with deuterium molecules has been studied using laser spectroscopy at CERN's new Antiproton Decelerator facility. The quenching cross-sections of the states (n, l )= (39, 36), (39, 37), and (39, 38) were determined from the decay rates of the states which were observed using the “deuterium-assisted inverse resonance” (DAIR) method. The results revealed a similar (n, l )-dependence of the quenching cross-sections as in the case of hydrogen but the values were smaller by a factor of ∼1.5.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1140/epjd/e20020046

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5

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Discrepancies in kinematic calculations of HOLZ lines (1993)

Eades, J. A. ; Moore, S. ; Pfullmann, T. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Microscopy Research and Technique 24 (1993), S. 509-513

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ISSN: 1059-910X

Keywords: Convergent-beam diffraction ; Lattice parameter ; Computer simulation ; Electron wavelength ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Natural Sciences in General

Notes: We have found significant differences between the results of computer simulations of HOLZ line patterns. The computations in question are made in the kinematical approximation. After trivial errors are eliminated the programs fall into two groups. There is a discrepancy between the two that increases with distance from the zone axis. The difference is small but not negligible at the level of precision used in determining lattice parameters or strain.We show which of the two is correct in the kinematic approximation and that the discrepancy between the two groups is of the order of the error introduced by dynamical interaction. © 1993 Wiley-Liss, Inc.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jemt.1070240607

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6

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Zone-axis diffraction patterns by the “Tanaka” method (1984)

Eades, J. A.

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 1 (1984), S. 279-284

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ISSN: 0741-0581

Keywords: Electron diffraction ; Zone-axis patterns ; Convergent-beam diffraction ; Tanaka method ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Natural Sciences in General

Notes: The “Tanaka” method is one of several techniques that make it possible to obtain zone-axis electron diffraction patterns in a transmission electron microscope without the restriction in the field of view that limits normal convergent-beam diffraction patterns.The method employs a convergent-beam of electrons focused to a probe in a plane that does not coincide with the specimen. The selected area aperture can then be used to eliminate all but one of the diffracted beams to obtain the desired pattern. Practical details of operation and values of operating parameters are discussed.The Tanaka method is a useful addition to the techniques available to the electron microscopist, especially since no instrumental modification is required.

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jemt.1060010306

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7

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Letter to the Editor: Comment on “Stereo-Imaging Made Easy” (1990)

Woodhouse, J. B. ; Eades, J. A.

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 14 (1990), S. 85-86

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ISSN: 0741-0581

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Natural Sciences in General

Notes: We believe that the paper in question (JEMT 11, 174, 1989) is presented in a way that is misleading.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jemt.1060140114

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8

Electronic Resource

Introduction (1989)

Eades, J. A.

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 13 (1989), S. 1-2

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ISSN: 0741-0581

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Natural Sciences in General

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jemt.1060130103

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9

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Scanning electron microscopy, X-ray microanalysis, and analytical electron microscopy. A laboratory workbook, By Charles E. Lyman, Dale E. Newbury, Joseph I. Goldstein, David B. Williams, Alton D. Romig Jr., John T. Armstrong, Patrick Echlin, Charles E. Fiori, David C. Joy, Eric Lifshin, and Klaus-Ruediger Peters. Plenum Press, New York, 1990, 407 pp, $29.95 (Spiral Bound) (1991)

Mochel, M. E. ; Dümler, I. ; Greene, A. ; [et al.]

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 19 (1991), S. 379-379

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ISSN: 0741-0581

Keywords: Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Natural Sciences in General

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/jemt.1060190312

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