|
|
|
| Registros recuperados: 1.973 | |
|
| |
|
| |
|
|
| Pérez, Benjamín Calvo. |
| The Magnetic Metallogenic Province of southwestern Spain has a large number of iron mines, in which magnetite and pyrite are the main ores. The largest of these mines, the Cala Mine, is placed in a Lower Cambrian environment, in the contact between a granitic apophysis and limestones. As a result, an important zone of skarn rocks (bearing pyroxene, amphiboles, garnet, epidote, etc.) is formed, and dealing with these rocks are the main stratiform orebodies. There is an old discussion about the origin of the mineral deposits. Some authors believe in a sedimentary genetic type, while others propose a contact-pneumatolitic process, related with the granitic stock. In this paper we try to prove that a primary sedimentary origin is possible for the magnetite.... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/505954 |
| |
|
|
| Spahr, Ronald W.; Sawaya, William J.. |
| During recent years, the feeder cattle industry has experienced financial instability. This paper provides a possible marketing strategy that may help reduce this financial instability by providing a Prehedging Strategy for the feedlot operator. The Prehedging Strategy establishes a dynamic hedge on the major factors of production of the feed lot operator and is shown to provide higher average returns and lower financial risk. |
| Tipo: Journal Article |
Palavras-chave: Livestock Production/Industries; Marketing. |
| Ano: 1981 |
URL: http://purl.umn.edu/32076 |
| |
|
|
| Ugarte, Galdos G.. |
| Since 1974, Uruguay has adopted an export-led growth strategy of deployment. Macroeconomic policies implemented toward this general objective have achieved impressive results in improving the general economic situation of the country. Increases in nontraditional manufactured exports have been largely responsible for the improvement in the overall growth performance and have brought about a substantial diversification of the export structure. Soybeans have also appeared recently as another nontraditional potentially exportable agricultural product. However, soybean production in Uruguay has not developed enough to make soybean exports an important and permanent source of foreign exchange. Given the need to diversify the export structure of the country,... |
| Tipo: Thesis or Dissertation |
Palavras-chave: Crop Production/Industries; Demand and Price Analysis. |
| Ano: 1981 |
URL: http://purl.umn.edu/11014 |
| |
|
| |
|
| |
|
|
| Strong, S.M.; Wolanowski, A.M.. |
| The determination of the price paid to its suppliers and by its customers is a major task for some marketing authorities. The commodity arrives randomly at the authority's facility and is removed randomly by customers. Between arrival and departure, the commodity awaits processing, is processed (graded, packed), and awaits removal by a customer. It is suggested that this similarity to a queue enables a profit function, dependent on price, to be constructed. Determination of the price maximising this function is seen to be one solution to the price setting problem. |
| Tipo: Journal Article |
Palavras-chave: Demand and Price Analysis. |
| Ano: 1981 |
URL: http://purl.umn.edu/22863 |
| |
|
| |
|
| |
|
|
| Vaccaro, Carlos Ma. |
| An analysis of food production and population trends reveals that mankind will continue to struggle to feed itself. From 1970-1976, annual per capita food production increased 1.4% in developed countries and at less than 1% in developing ones. Population growth rates have been declining in the former, but have remained more or less constant and at much higher levels in the latter. Therefore increasing food supply is more critical in developing countries. Three approaches are often mentioned to help cope with the possible world food shortage: 1) increase food supplies by increasing production; 2) reduce future increase in demand by slowing population growth; and 3) increase food availability by reducing post-harvest losses. All three approaches are... |
| Tipo: Thesis or Dissertation |
Palavras-chave: Crop Production/Industries. |
| Ano: 1981 |
URL: http://purl.umn.edu/11265 |
| |
|
| |
|
|
| Wilde, W.J.J.O. de. |
| Beside Saraca celebica from Celebes, presently a second species from East Malesia is described. As based on the revison by Zuyderhoudt (Blumea 15, 1967: 413 – 425), with 8 accepted species, there are now 9 species of Saraca, ranging from India and Indo-China into Malesia east to the Lesser Sunda I. (Flores) and the Moluccas (Halmaheira). The new species, Saraca monadelpha, was initially recognized through a specimen from Halmaheira which was difficult to determine as a Saracca because of its deviating partly fused stamens and its origin beyond the known area of the genus. Of S. celebica the pods were not known until recently collected in Central Celebes The fruits of S. monadelpha are still unknown. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/524671 |
| |
|
|
| Heel, W.A. van. |
| The early development (ontogeny) of the carpels of 20 species belonging to 8 apocarpous families was investigated with the scanning electron microscope. The results indicate that on the floral apex a circular or a convex meristem develops into an obliquely ascidiate primordium by unequal growth of its periphery. By further unequal growth it develops into a young carpel. The terminal mouth of a cup becomes the lateral cleft of a carpel. The different forms of the young carpels in different species are defined by the varying degree of development of the adaxial region of the initial meristem and/or its margin on the side of the floral apex. This hypothesis is theoretically evaluated. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/525801 |
| |
|
|
| Higuchi,Niro. |
| Resumo O presente relato procura mostrar a evolução da Silvicultura, em termos de pesquisas, durante os 27 anos de existência do Instituto Nacional de Pesquisas da Amazônia (INPA), desde a primeira proposição para a criação de uma reserva florestal pelo botânico Adolfo Ducke, atualmente Reserva Florestal Ducke, até os dias de hoje, sendo também referenciada ao desenvolvimento florestal no Brasil. São apresentados, resumidamente, os trabalhos de pesquisas silviculturais desenvolvidos e em desenvolvimento pelo Departamento de Silvicultura Tropical na Reserva Florestal Ducke (Km-26 da Rodovia Manaus-ltacoatiara com 10000 hectares) e na Estação Experimental de Silvicultura Tropical (Km-45 da Rodovia Manaus-Caracarai com 21000 hectares). Sobre trabalhos em... |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1981 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59671981000900099 |
| |
|
| |
|
| |
|
|
| Aubouin, J; Van Huene, R; Azema, J; Blackinton, G; Carter, Ja; Coulbourn, W T; Cowan, D S; Curiale, Ja; Dengo, Ca; Faas, Rw; Harrison, W; Hesse, R; Hussong, Dm; Ladd, Jw; Muzylev, N; Shiki, T; Thompson, Pr; Westberg, J. |
| The Middle America Trench off Guatemala was transected by 24-channel seismic-reflection surveys, seismic-refraction surveys, and drilling with the Glomar Challanger . The drilling was doneat three sites on the oceanic Cocos plate and four sites on the Caribbean plate. These plates converge at about 10 cm/yr as indicated by global plate reconstruction. On the oceanic Cocos plate a basal chalk sequence of lower and middle Miocene age is overlain by a thin interval of abyssal clay. In contrast is the Cretaceous to lower Miocene claystone sequence recovered only at a site 3 km landward of the trench axis where drilling penetrated the hemipelagic slope deposits. A large amount of sediment along with ocean crust has been subducted during the present (Miocene to... |
| Tipo: Text |
|
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00245/35671/34179.pdf |
| |
|
|
| Von Huene, R; Uyeda, S. |
| Investigations of convergent margins along the IPOD transects support the concept of ocean floor spreading in back-arc basins and the concept of tectonically accreted sediment at the front of convergent margins. However, not all convergent margins have large accreted complexes, and other less frequently used concepts are required in the interpretations of these convergent margins. If the present rates of plate convergence are accepted, then much sediment that entered the trenches studied is presumably subducted rather than accreted. In some instances, the continental framework is truncated and somehow removed by tectonic erosion. Some convergent margins have subsided significantly during subduction. The crust above the Benioff zone appears to have been... |
| Tipo: Text |
|
| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00245/35659/34168.pdf |
| |
| Registros recuperados: 1.973 | |
|
|
|
