170,506 research outputs found
Laser Magnetic Resonance Measurement Of The 3p1-3p0 Fine-structure Separation Of P+
No full textThe far-infrared laser magnetic resonance spectrum associated with the J = 1 ← 0 fine-structure transition of 31P+ in its ground 3P state has been recorded. This is the first laboratory observation of this magnetic dipole transition, and its frequency has been measured 2 orders of magnitude more accurately than the previous, indirect determination from optical spectroscopy. The frequency is ΔE10 = 4944433.0 ± 1.7 MHz. A small nuclear hyperfine splitting was also observed for the J = 1 level.4642 PART IIL203L206Brown, J.M., Evenson, K.M., Zink, L.R., (1993) Phys. Rev. A, 48, p. 3761(1994) ApJ, 431, pp. L147Brown, J.M., Varberg, T.D., Evenson, K.M., Zink, L.R., (1994) ApJ, 428, pp. L37Brown, J.M., Zink, L.R., Evenson, K.M., (1994) ApJ, 423, pp. L151Cooksy, A.L., Hovde, D.C., Saykally, R.J., (1986) J. Chem. Phys., 84, p. 6101Guélin, M., Cernicharo, J., Paubert, G., Turner, B.E., (1990) A&A, 230, pp. L9Haas, M.R., Hollenbach, D.J., Erickson, E.F., (1991) ApJ, 374, p. 555Lugten, J.B., Genzel, R., Crawford, J.K., Townes, C.H., (1986) ApJ, 306, p. 691Martin, W.C., Zalubas, R., Musgrove, A., (1985) J. Phys. Chem. Ref. Data, 14, p. 751Moore, C.E., (1949) Atomic Energy Levels as Derived from the Analyses of Optical Spectra, 1. , (Circ. Natl. Bur. Stand. 467) (Washington: NBS)Svendenius, N., Magnusson, C.E., Zetterberg, P.O., (1983) Phys. Scr., 27, p. 339Tielens, A.G.G.M., Hollenbach, D.J., (1983) ApJ, 291, p. 722Turner, B.E., Bally, J., (1987) ApJ, 321, pp. L75Varberg, T.D., Brown, J.M., Evenson, K.M., (1994) J. Chem. Phys., 100, p. 2487Vasconcellos, E.C.C., Zerbetto, S.C., Holecek, J.C., Evenson, K.M., (1995) Opt. Lett., 20, p. 1Veseth, L., (1980) Phys. Rev. A, 22, p. 803Wright, E.L., (1991) ApJ, 381, p. 200Ziurys, L.M., (1987) ApJ, 321, pp. L8
Donald Jennings [left] and Kenneth Evenson with the frequency measurement apparatus
No full textKenneth Evenson, Donald Jennings, and Russell Peterson successfully accomplished the highest direct frequency measurement (over 520 terahertz) made at that time (1970s) in a joint project with the Canadian National Research Council. See NBS Special Publication 367, p.22. This image is part of the Evenson Highest Frequency collection. National Bureau of Standards (NBS) researchers Kenneth Evenson, Donald Jennings and Russell Petersen successfully accomplished the highest direct frequency measurement ever made (over 520 terahertz) in a joint project with the Canadian National Research Council in 1972
Donald Jennings [left] and Kenneth Evenson with the frequency measurement apparatus
No full textKenneth Evenson, Donald Jennings, and Russell Peterson successfully accomplished the highest direct frequency measurement (over 520 terahertz) made at that time (1970s) in a joint project with the Canadian National Research Council. See NBS Special Publication 367, p.22. This image is part of the Evenson Highest Frequency collection. National Bureau of Standards (NBS) researchers Kenneth Evenson, Donald Jennings and Russell Petersen successfully accomplished the highest direct frequency measurement ever made (over 520 terahertz) in a joint project with the Canadian National Research Council in 1972
Long-Run Structural and Productivity Change in U.S. Agriculture: Effects of Prices and Policies
No full textLong-Run Structural and Productivity Change in U.S. Agriculture: Effects of Prices and Policies by Wallace E. Huffman and Robert E. Evenson The paper presents (1) a conceptual framework for structural change when farms may be multiproduct or specialized and (2) an econometrics examination of causes of structural and total factor productivity (TFP) change for U.S. agriculture. Farm size, farm specialization, and part-time farming are the structural dimension emphasized, and they become potential channels to TFP change. Using state aggregate data starting in 1950, we conclude that input prices, public and private research, public extension, and government commodity programs have directly and indirectly caused change in U.S. farm structure and TFP. Our results suggest that changes in farm size, however, have been dominated by input price changes rather than by technology or government programs.farm structure, productivity, farm size, farm specialization, part-time farming, research, technical change, agriculture
On assassine Paris : "Paris : a Century of Change". 1878-1978, par Norma Evenson
No full textThe assassination of Paris. (Richard Cobb, p.97-113)
In his account of Norma Evenson's book : Paris : a century of change. 1878-1978, Richard Cobb points to the upheavals wrought by the great renovation works in the social make-up and relationships which prevailed in the very varied Paris quarters.
The arguments in favour of grandiose architectural and urban transformation plans minimize, dismiss, even deny the magnitude of the upheavals they cause in the human geography of Paris.A propos du compte rendu qu'il fait de l'ouvrage de Norma Evenson : Un siècle de changement architectural et urbanistique à Paris. 1878-1978, Richard Cobb évoque les bouleversements que les grands travaux d'aménagement ont provoqués dans la composition sociale de quartiers de Paris extrêmement variés.
Les discours qui soutiennent les projets grandioses de transformation architecturale et urbanistique minimisent, ignorent, voire même dénient l'importance des bouleversements qu'ils provoquent dans la géographie humaine de Paris.Asesinan a Paris. (Richard Cobb, p.97-113)
Richard Cobb evoca, con motivo del comentario del libro de Norma Evenson : Un siglo de cambios arquitectónicos y Urbanísticos en París. 1878-1978, las conmociones que engendraron las grandes obras de urbanismo, en la composición social y en las relaciones sociales dentro de los barrios de París, tan diferentes entre si.
Los discursos que sostienen a los proyectos grandiosos de transformaciones arquitectónicas y urbanísticas, minimizan, ignoran, e incluso niegan la importancia de esas conmociones, sufridas por la geografía humana de París.Cobb Richard, Leblond Doris. On assassine Paris : "Paris : a Century of Change". 1878-1978, par Norma Evenson. In: Les Annales de la recherche urbaine, N°7, 1980. pp. 97-113
Rotational And Hyperfine Constants Of Vibrationally Excited Nh (a1Δ; V = 1)
No full text[No abstract available]1221242245Leopold, Evenson, Brown, (1986) J. Chem. Phys., 85, pp. 324-330Peterson, Scalabrin, Evenson, Frequencies of cw FIR laser lines from optically pumped CH2F2 (1980) International Journal of Infrared and Millimeter Waves, 1, pp. 111-115Hall, Adams, Kasper, Curl, Tittel, Color-center laser kinetic spectroscopy: observation of the a^1Δ NH vibrational fundamental (1985) Journal of the Optical Society of America B, 2, pp. 781-784Gordy, Cook, (1970) Microwave Molecular Spectra, p. 518. , Wiley-Interscience, New Yor
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The Diffusion of Bt Cotton and the Economic Impact on Producers
No full textThe objective is to present the economic impact of producers adopting Bt cotton and the rapid diffusion on the main producing countries: USA, China and India. The existing literature about this type of transgenic crop has been revised and the results of different research are presented. Bt cotton varieties have been quickly adopted by the countries in this study. Data show that this technology helps reduce production losses and significantly decrease the use of pesticides, thus saving their cost and the associated labour cost. But the total cost reduction is weak due to the high prices of the seeds incorporating this technology.Innovation diffusion, Bt cotton, Crop Production/Industries,
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
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