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| Registros recuperados: 1.973 | |
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| Leholm, Arlen G.; Supalla, Raymond J.; Vollmar, Glen. |
| The growth in agricultural productivity and significance of science and technology in contributing to this growth has been well documented by Bredahl, Cline, Evenson (1967), Griliches (1964), and Peterson. The results of these studies generally indicate that over the past several decades, investment in agricultural research has paid off with relatively high rates of return. Most of this previous work, however, has been directed at estimating returns to aggregate agricultural research in an ex post sense at the national level and does not address the question of potential future returns to research at a state or regional level (Norton). Thus, a particular need exists to develop a methodology for evaluating the potential returns to specific types of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1981 |
URL: http://purl.umn.edu/49073 |
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| Buffler, R T; Shaub, F J; Huerta, R; Ibrahim, Abk; Watkins, J S. |
| Seismic data from the deep Gulf of Mexico basin indicate: 1) inferred ocenaic crust in the deep central Gulf (5 to 6 km thick; 6.8 to 7.1 km/sec.) is flanked symmetrically on the north and south by inferred transitional crust (8 to 15 km thick; 6.4 to 6.8 km/sec.); 2) acoustic basement seen on the reflection data in the central Gulf is an irregular reflector and probably represents the top of an oceanic volcanic (basaltic) layer (layer 2); 3) northof the Campeche Escar pment the top of transitional crust is represented by a strong, smooth reflector/unconformity that truncates rift basins and is onlapped by a thick salt and sedimentary section; 4) in the southeastern Gulf transitional crust consists of tilted basement blocks probably representing a thinned... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00246/35679/34187.pdf |
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| Leenhouts, P.W.. |
| Descriptio typi: Arbor 35 m alta, 35 cm diam. Ramuli 2 cm diam., glabri; medulla fasciculis vasorum multis pro parte peripheralibus suffulta; gemma terminalis + 1 cm longa. Folia 7-jugata. Slipulae in hasi petioli insertae, subulatae, 4 — 5 mm longae, costatae, ± persistentes. Petiolus 20 cm longus, ca. 5 mm diam., medulla ca. 20-25 fasciculis vasorum suffulta; petioluli laterales 1 — 1,5 cm longi, petiolulus terminalis 3 cm longus. Foliola ca. 20 cm longa, 6 — 8 cm lata, elliptica vel ovata, pergamentacea, glabra; basis subobliqua, rotundata vel subcordata; margo integer; apex abrupte acuminatus, acumine 0,5 – 1,5 cm longo, angusto, rotundato; costa supra prominula; nervi laterales inter se ca. 1,5 cm distantes, subpatentes, praeter marginem abrupte... |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/524468 |
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| Leenhouts, P.W.. |
| Frutex scandens, 3 m altus. Folia petiolata; petiolus 1.5 — 2.25 cm longus, gracilis, exauriculatus; squama axillae pro majore parte libera, bilobata ad rotundata, usque ad 3.5 mm alta; lamina 13.5 — 22 cm longa, 4 — 6.5 cm lata, oblonga vel lanceolata, coriacea; basis anguste cuneata; margo integer; apex gradatim acuminatus, acumine longo gracili acuto; costa subtus rotundata; nervi secundarii utrimque circa 6, minute sulcati, subinspectabilis. Inflorescentiae terminales, triflorae, praeterea ramos basales trivel unifloros in axile foliorum summorum suffulta; pedunculi robusti 2 (— 15) mm longi, pedicelli robusti circa 1 cm longi, verrucosi, ebracteolati. Calyx campanulatus 6 — 7 mm altus, lobis semiconnatis, rotundatis, marginatis. Corolla membranacea,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/525156 |
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| Berg, C.C.. |
| Arbor terrestris. Ramuli foliosi circa 1 cm diam., subglabri. Lamina oblanceolata vel subobovata, 10-28 cm longa, 3,5-9 cm lata, brevissime acuminate, basi (sub)acuta, faciebus subglabris; vennae laterales 10-16 pro latere; petiolus 1-1,5 (-2,5) cm longus; stipulae 1,5-4 cm longae, (sub)persistentes, subglabrae. Syconia axillaria bina, (sub)glabra, circa 2 cm diam. |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/534964 |
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| Baas, P.. |
| Original data on leaf crystals and stomatal types in 25 genera of Melastomataceae are presented, and discussed with reference to the classification of the family as modified by Van Vliet et al. (1981, this issue). The heterogeneity of the abolished subfamily Astronioideae is confirmed and a separation of Pternandra from the Astronieae is also justified on the basis of leaf anatomical data. The Astronieae are characterized by large styloids and predominantly anomocytic stomata; this combination of characters also occurs in part of the Melastomatoideae (especially the Miconieae). Most other Melastomatoideae are characterized by polocytic to diacytic stomata and druses. The subfamilies Memecyloideae and Crypteronioideae remain rather heterogeneous leaf... |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/524994 |
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| Wilson, T.D.; Wissemann, A.F.. |
| The benefits of an objective method of describing beef carcasses are being investigated through trials at several Australian abattoirs. This paper reports the results of an attitudinal study carried out with the beef retailers who trade with one of these abattoirs. Most retailers surveyed were receptive to the idea of an objective classification system and felt that it would be useful to them in carcass trading. However, other findings raised doubts about the ability of the system being trialed to meet their requirements. The results had a number of implications for the planning of specific aspects of this classification trial. |
| Tipo: Journal Article |
Palavras-chave: Marketing. |
| Ano: 1981 |
URL: http://purl.umn.edu/12251 |
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| Alston, Julian M.. |
| Marketing systems using non-transferable or imperfectly transferable quotas induce shifts in supply as well as shifts along supply functions. There are social costs associated with these shifts which are additional to those normally recognised in the literature. To reduce the size of the shifts in supply and the social costs, quotas should he efficiently transferable. |
| Tipo: Journal Article |
Palavras-chave: Marketing. |
| Ano: 1981 |
URL: http://purl.umn.edu/12238 |
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| Klein, Patrice; Coantic, Michel. |
| A second-order turbulence closure model, similar to Mellor and Yamada's (1974) level-3 model, is implemented. This is used to investigate the role of the different turbulent processes and the resulting dynamical and thermal structures, for oceanic upper layers subjected to a variety of unsteady atmospheric forcings. From the distributions obtained for current and temperature, turbulence levels, the production, transfer and dissipation terms in the turbulent kinetic energy and temperature variance budgets, the physics of the oceanic mixed layer and thermocline can be discussed and comparisons made with the models of Mellor and Durbin (1975), Warn-Varnas and Piacsek (1979) and Kundu (1980) and some experimental data. Most often, shear production and viscous... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00254/36569/35122.pdf |
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| Registros recuperados: 1.973 | |
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