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504 results on '"Jones, G. M."'

59. Small space station electrical power system design concepts

Author

Jones, G. M and Mercer, L. N

Subjects
Spacecraft Propulsion And Power
Abstract

A small manned facility, i.e., a small space station, placed in earth orbit by the Shuttle transportation system would be a viable, cost effective addition to the basic Shuttle system to provide many opportunities for R&D programs, particularly in the area of earth applications. The small space station would have many similarities with Skylab. This paper presents design concepts for an electrical power system (EPS) for the small space station based on Skylab experience, in-house work at Marshall Space Flight Center, SEPS (Solar Electric Propulsion Stage) solar array development studies, and other studies sponsored by MSFC. The proposed EPS would be a solar array/secondary battery system. Design concepts expressed are based on maximizing system efficiency and five year operational reliability. Cost, weight, volume, and complexity considerations are inherent in the concepts presented. A small space station EPS based on these concepts would be highly efficient, reliable, and relatively inexpensive.

Published
1976

60. Extendible probe for atmosphere sampling

Author

Jones, W. J, Mitchell, G. D, and Jones, G. M

Subjects
Physical Sciences
Abstract

Sampling probe is extended through small plug in heat shield by loaded bellows to sample planetary atmosphere for compositional analysis and total pressure during entry of space probe. Assembly prevents contamination of sample by gases from pyrotechnic device and serves as sealed plenum for atmospheric pressure sensor.

Published
1974

61. Thermal interaction of the core and the mantle and long-term behavior of the geomagnetic field

Author

Jones, G. M

Subjects
Geophysics
Abstract

The effects of temperature changes at the earth's core-mantle boundary on the velocity field of the core are analyzed. It is assumed that the geomagnetic field is maintained by thermal convection in the outer core. A model for the thermal interaction of the core and the mantle is presented which is consistent with current views on the presence of heat sources in the core and the properties of the lower mantle. Significant long-term variations in the frequency of geomagnetic reversals may be the result of fluctuating temperatures at the core-mantle boundary, caused by intermittent convection in the lower mantle. The thermal structure of the lower mantle region D double prime, extending from 2700 to 2900 km in depth, constitutes an important test of this hypothesis and offers a means of deciding whether the geomagnetic dynamo is thermally driven.

Published
1977

62. Subjective detection of vertical acceleration: A velocity dependent response?

Author

Jones, G. M and Young, L. R

Subjects
Aerospace Medicine
Abstract

Difficulty in the subjective tracking of the whole body vertical accelerative movement parallel to the long axis of the body is discussed which identified specifically the direction of imposed acceleration to be the difficulty rather than low sensitivity to vertical acceleration. The product of angular acceleration and time to detect proves to be constant over a wide range of suprathreshold step changes of angular acceleration. It is concluded that threshold conditions are determined by the velocity attained rather than the acceleration amplitude for the semicircular canals.

Published
1976

68. Reliability analysis of Skylab ATM solar cell modules

Author

Jones, G. M and Bray, L. R

Subjects
Auxiliary Systems
Abstract

A detailed reliability analysis was performed on both types of Skylab Apollo telescope mount solar cell modules. Failure rates used were based on testing of several modules of each type for over 4000 thermal cycles. The analysis delineated several important differences between the failure modes of the two differently designed solar cell modules, and, more importantly, showed that the modules can be expected to meet all mission requirements.

Published
1974

72. Precision Measurement of the Weak Mixing Angle in Møller Scattering

Author

Anthony, P. L., primary, Arnold, R. G., additional, Arroyo, C., additional, Bega, K., additional, Biesiada, J., additional, Bosted, P. E., additional, Bower, G., additional, Cahoon, J., additional, Carr, R., additional, Cates, G. D., additional, Chen, J.-P., additional, Chudakov, E., additional, Cooke, M., additional, Decowski, P., additional, Deur, A., additional, Emam, W., additional, Erickson, R., additional, Fieguth, T., additional, Field, C., additional, Gao, J., additional, Gary, M., additional, Gustafsson, K., additional, Hicks, R. S., additional, Holmes, R., additional, Hughes, E. W., additional, Humensky, T. B., additional, Jones, G. M., additional, Kaufman, L. J., additional, Keller, L., additional, Kolomensky, Yu. G., additional, Kumar, K. S., additional, LaViolette, P., additional, Lhuillier, D., additional, Lombard-Nelsen, R. M., additional, Marshall, Z., additional, Mastromarino, P., additional, McKeown, R. D., additional, Michaels, R., additional, Niedziela, J., additional, Olson, M., additional, Paschke, K. D., additional, Peterson, G. A., additional, Pitthan, R., additional, Relyea, D., additional, Rock, S. E., additional, Saxton, O., additional, Singh, J., additional, Souder, P. A., additional, Szalata, Z. M., additional, Turner, J., additional, Tweedie, B., additional, Vacheret, A., additional, Walz, D., additional, Weber, T., additional, Weisend, J., additional, Woods, M., additional, and Younus, I., additional

Published
2005
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75. Observation of Parity Nonconservation in Møller Scattering

Author

Anthony, P. L., primary, Arnold, R. G., additional, Arroyo, C., additional, Baird, K., additional, Bega, K., additional, Biesiada, J., additional, Bosted, P. E., additional, Breuer, M., additional, Carr, R., additional, Cates, G. D., additional, Chen, J-P., additional, Chudakov, E., additional, Cooke, M., additional, Decker, F. J., additional, Decowski, P., additional, Deur, A., additional, Emam, W., additional, Erickson, R., additional, Fieguth, T., additional, Field, C., additional, Gao, J., additional, Gustafsson, K., additional, Hicks, R. S., additional, Holmes, R., additional, Hughes, E. W., additional, Humensky, T. B., additional, Jones, G. M., additional, Kaufman, L. J., additional, Kolomensky, Yu. G., additional, Kumar, K. S., additional, Lhuillier, D., additional, Lombard-Nelsen, R., additional, Mastromarino, P., additional, Mayer, B., additional, McKeown, R. D., additional, Michaels, R., additional, Olson, M., additional, Paschke, K. D., additional, Peterson, G. A., additional, Pitthan, R., additional, Pope, K., additional, Relyea, D., additional, Rock, S. E., additional, Saxton, O., additional, Shapiro, G., additional, Singh, J., additional, Souder, P. A., additional, Szalata, Z. M., additional, Tobias, W. A., additional, Tonguc, B. T., additional, Turner, J., additional, Tweedie, B., additional, Vacheret, A., additional, Walz, D., additional, Weber, T., additional, Weisend, J., additional, Whittum, D., additional, Woods, M., additional, and Younus, I., additional

Published
2004
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76. Q2Evolution of the Generalized Gerasimov-Drell-Hearn Integral for the Neutron using aH3eTarget

Author

Amarian, M., primary, Auerbach, L., additional, Averett, T., additional, Berthot, J., additional, Bertin, P., additional, Bertozzi, W., additional, Black, T., additional, Brash, E., additional, Brown, D., additional, Burtin, E., additional, Calarco, J. R., additional, Cates, G. D., additional, Chai, Z., additional, Chen, J.-P., additional, Choi, Seonho, additional, Chudakov, E., additional, Cisbani, E., additional, de Jager, C. W., additional, Deur, A., additional, DiSalvo, R., additional, Dieterich, S., additional, Djawotho, P., additional, Finn, M., additional, Fissum, K., additional, Fonvieille, H., additional, Frullani, S., additional, Gao, H., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Goldberg, E., additional, Gomez, J., additional, Gorbenko, V., additional, Hansen, J.-O., additional, Hersman, F. W., additional, Holmes, R., additional, Huber, G. M., additional, Hughes, E. W., additional, Humensky, T. B., additional, Incerti, S., additional, Iodice, M., additional, Jensen, S., additional, Jiang, X., additional, Jones, C., additional, Jones, G. M., additional, Jones, M., additional, Jutier, C., additional, Ketikyan, A., additional, Kominis, I., additional, Korsch, W., additional, Kramer, K., additional, Kumar, K. S., additional, Kumbartzki, G., additional, Kuss, M., additional, Lakuriqi, E., additional, Laveissiere, G., additional, Lerose, J., additional, Liang, M., additional, Liyanage, N., additional, Lolos, G., additional, Malov, S., additional, Marroncle, J., additional, McCormick, K., additional, McKeown, R., additional, Meziani, Z.-E., additional, Michaels, R., additional, Mitchell, J., additional, Papandreou, Z., additional, Pavlin, T., additional, Petratos, G. G., additional, Pripstein, D., additional, Prout, D., additional, Ransome, R., additional, Roblin, Y., additional, Rowntree, D., additional, Rvachev, M., additional, Sabatie, F., additional, Saha, A., additional, Slifer, K., additional, Souder, P. A., additional, Saito, T., additional, Strauch, S., additional, Suleiman, R., additional, Takahashi, K., additional, Teijiro, S., additional, Todor, L., additional, Tsubota, H., additional, Ueno, H., additional, Urciuoli, G., additional, Van der Meer, R., additional, Vernin, P., additional, Voskanian, H., additional, Wojtsekhowski, B., additional, Xiong, F., additional, Xu, W., additional, Yang, J.-C., additional, Zhang, B., additional, and Zolnierczuk, P., additional

Published
2002
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91. Aardvark burrows: a potential resource for animals in arid and semi-arid environments.

Author

Whittington-Jones, G. M., Bernard, R. T. F., and Parker, D. M.

Subjects
*AARDVARK, *ARID regions, *RAINFALL, *LABORATORY rodents, *PREDATION, *SPECIES diversity, *HUMIDITY
Abstract

Arid and semi-arid environments are characterized by extreme fluctuations in temperature and low rainfall, which present significant challenges to the animals inhabiting these areas. However, the presence of burrows may allow animals to avoid climatic extremes and predators and may act as valuable foraging sites. We assessed the microhabitat conditions (maximum and minimum temperature, relative humidity and seed abundance) of aardvark (Orycteropus afer) burrows in relation to paired non-burrow areas at three sites in South Africa. We also describe the extent to which they are used as resources by other vertebrates. Maximum temperatures were significantly lower and minimum temperatures and relative humidity values were significantly higher inside the burrows than outside. The concentration of seeds inside the burrows and at the paired non-burrow sites was similar. Twenty-seven vertebrate species (21 mammals, two birds, three reptiles and one amphibian) were recorded making use of the burrows and it is likely that these species accrue benefits (e.g. a buffered microclimate) from burrow use. However, our sampling was biased towards mammals and nocturnal species. Consequently, we recommend further work to establish the overall reliance of vertebrate taxa on aardvark burrows in arid and semi-arid environments. [ABSTRACT FROM AUTHOR]

Published
2011
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92. Time to Engage? Texting to Support and Enhance First Year Undergraduate Learning.

Author

Jones, G. M. and Edwards, G.

Subjects
COLLEGE students, HIGHER education, ACADEMIC degrees, CURRICULUM, CELL phones, MOBILE communication systems, COMMUNICATION & technology
Abstract

In this paper we discuss a case study investigating how the academic and personal development of first year students on an undergraduate sports education degree can be supported and enhanced with mobile SMS communication. SMS-based technologies were introduced in response to students' particular needs (in transition to Higher Education) and characteristics ('digital natives'). Despite being unaccustomed to using their mobile phones for academic study, students willingly participated in SMS communication with their tutor via a texting management service. Drawing on evidence from two student surveys, focus groups and a tutor's journal, we illustrate the potential that mobile SMS communication has to link and establish continuity between face to face teaching sessions and online learning activities in the Virtual Learning Environment (VLE). Many students perceived the SMS communication to have had a positive impact on their management of study time. We link our findings with the existing literature and argue that mobile text based communication has the potential to support the development of time management skills, an important component of self regulatory learning, a skill which has been shown to be key in making a successful transition. [ABSTRACT FROM AUTHOR]

Published
2009
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97. Chromosome mosaicism in day 3 aneuploid embryos that develop to morphologically normal blastocysts in vitro.

Author

Magli, M. C., Jones, G. M., Gras, L., Gianaroli, L., Korman, I., and Trounson, A. O.

Abstract

In all, 143 human embryos obtained 3 days (day 3) after insemination or intracytoplasmic sperm injection (ICSI) were biopsied and a single nucleated cell removed for identification of aneuploidy by fluorescent in-situ hybridization (FISH) for chromosomes X, Y, 13, 16, 18 and 21. Fifty-one per cent of embryos were aneuploid and significantly more aneuploid embryos blocked in further development to morulae and blastocysts than euploid embryos (59 versus 34%; P < 0.001). Chromosomal analysis of the generated blastocysts revealed 40% were aneuploid (16 of 40 generated blastocysts). Re-examination of cells by FISH for the same chromosome probes of the inner cell mass (ICM) of expanded and hatching blastocysts derived from the aneuploid embryos revealed a high incidence of mosaicism of ICM cell lineages that were usually predictable from observations of day 3 single-cell biopsies. These data would not support the hypothesis of a preferential allocation of euploid cells to the ICM and aneuploid cells to the trophectoderm. A high concordance between day 3 aneuploidy diagnosis and ICM cell lineages was observed with trisomies (97%), and multiple complex chromosome numerical abnormalities (100%). A reduced concordance was observed with monosomies (65%) and haploidy (18%). Concomitantly, the proportion of ICM cell lineages was increased in blastocysts whose chromosomal condition was diagnosed as haploid (21%) or with complex numerical abnormalities (50%). [ABSTRACT FROM AUTHOR]

Published
2000
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98. Effect of recombinant human gonadotrophins on human, bovine and murine oocyte meiosis, fertilization and embryonic development in vitro.

Author

Anderiesz, C., Ferraretti, A.-P., Magli, C., Fiorentino, A., Fortini, D., Gianaroli, L., Jones, G. M., Trounson, A. O., and Ferraretti, A

Abstract

The response of murine, bovine and human oocytes to pure recombinant preparations of human follicle stimulating hormone (rFSH) and luteinizing hormone (rLH) for meiotic maturation and subsequent developmental competence in vitro were examined in the present experiments. Maturation of immature bovine oocytes to the metaphase II stage was significantly increased by the addition of 1 IU/ml of rFSH in combination with either 1 IU/ml rLH or 10 IU/ml rLH. Similarly, embryonic development to the blastocyst stage was improved in bovine oocytes treated with a 1:10 combination of rFSH:rLH. However, no significant difference was observed in the number of inner cell mass or trophectoderm cells of the resulting blastocysts. Although the increased maturation to metaphase II was not significant, human embryonic developmental competence was improved by maturing oocytes in the presence of a 1:10 ratio of rFSH:rLH as only those oocytes exposed to a 1:10 ratio of rFSH: rLH during maturation showed normal cleavage patterns beyond day 2. In addition, 1 IU/ml rFSH and 1 IU/ml rLH increased the expression of oocyte proteins in human oocytes. The inclusion of recombinant gonadotrophins, either singly or in combination, had no significant effect on the maturation, fertilization or embryonic development of in-vitro matured mouse oocytes. These data provide support for the responsiveness of human and bovine oocytes to gonadotrophins in vitro and the need to consider variations in the relative concentrations for optimization of oocyte developmental competence. [ABSTRACT FROM AUTHOR]

Published
2000
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