Fine-silt luminescence dating and mineral composition of sediments from the Arctic Ocean

New geochronometers are needed for sediments of the Arctic Ocean spanning at least the last half million years, largely because oxygen-isotope stratigraphy is relatively ineffective in this ocean, and because other dating techniques require significant assumptions about sedimentation rates. Multi-aliquot luminescence sediment-dating procedures were applied to polymineral, fine-silt samples from 9 core-top and 37 deeper samples from 20 cores representing 19 sites across the Arctic Ocean. Most samples have independent age assignments and other known properties (e.g., % coarse fraction, % carbonate, U-Th isotopes). Thick-source alpha-particle counting indicates that for most regions the contribution of measured unsupported 230Th and 231Pa to calculated dose rates is

Effect of Size Reduction on Magnetic Ordering in Sm1-x Ca (x) MnO3 (x=0.35, 0.65 and 0.92) Manganites: Magnetic and EMR Studies

We have employed the highly sensitive electron magnetic resonance technique complimented by magnetization measurements to study the impact of size reduction on the magnetic ordering in nanosized Sm1-x Ca (x) MnO3 (x = 0.35, 0.65 and 0.92). In the bulk form, x = 0.35 sample shows a charge ordering transition at 235 K followed by a mixed magnetic phase, the sample with x = 0.65 exhibits charge order below 275 K and shows an antiferromagnetic insulator phase below 135 K while that with x = 0.92 has a ferromagnetic-cluster glass ground state. Thus, a comparative study of magnetic ground states of bulk and nanoparticles (diameter similar to 25 nm) enables us to investigate size-induced effects on different types of magnetic ordering. It is seen that in the bulk samples the temperature dependences of the EPR parameters are quite different from each other. This difference diminishes for the nanosamples where all the three samples show qualitatively similar behavior. The magnetization measurements corroborate this conclusion.

Estudio de observación de ciento doce líneas de arroz (Oryza sativa L.) VIOAL-92, bajo ecosistema de riego en la localidad de Malacatoya

Con el objetivo de evaluar 112 líneas de Arroz de porte semienano, procedentes en su mayoría de Colombia, Vivero IRRI (IIRON), Argentina, Cuba y Perú, y utilizando como testigos internacionales las variedades CICA-8 y ORYZICA-1 y como testigos locales las variedades ALTAM1RA-9, ALTAM1RA-10 y CICA-8 también considerada como testigo local, se llevó a cabo un estudio en la "Finca Venllano", ubicada en Malacatoya, municipio del departamento de Granada, bajo el agroecosistema de riego. A cada línea se le evalúo las características agronómicas (floración, altura, desgrane, senescencia, exerción, acame y aceptabilidad fenotípica) y los componentes del rendimiento ( long de panícula, número de granos por panícula, porcentaje de fertilidad, peso de 1000 granos, rendimiento y rendimiento industrial ( % de arroz integral, % de arroz pulido y % de arroz oro). Se seleccionaron 15 líneas por sus características agronómicas y su potencial de rendimiento, lo que da un 13% de selección del material evaluado. La línea de mejor rendimiento fue la 113 (ECIA 561 con 5980 Kg/ha y la de menor rendimiento fue la línea 30 (CT9508-48-1-1P-2PT) con 3195 Kg/ha. El material de mejor calidad industrial fue la línea 10 (CT8837-1-17-1P-4) con 58.5 % de Arroz Oro y la línea más baja fue la 41 (CT7B05-17-4A-M-4P) con 48.0 % de Arroz Oro.

Sapientia, 1969, Vol. XXIV, nº 92 (número completo)

Contenido: El orden esencial y la inteligencia / Octavio N. Derisi – Las relaciones entre la ciencia y la filosofía / Juan A. Casaubón – Continuidad de la materia y participación / J. E. Bolzán -- Notas y comentarios -- Bibliografía

Preservação ambiental, um discurso de todos da Eco 92 à Rio + 20

Coletânea de discursos e debates realizados no âmbito da Câmara dos Deputados sobre diferentes temas relacionados ao meio ambiente.

Edital nº 3/92 : concurso público para Agente de Segurança Legislativa e Operador de Máquinas

Torna pública a data e os locais de realização das provas de Língua Portuguesa e Legislação para o cargo de Agente de Segurança Legislativa, e a data e local de realização das provas de Conhecimentos Específicos, Língua Portuguesa e Legislação para o cargo de Operador de Máquinas.

Constituição da República Federativa do Brasil [recurso eletrônico] : texto constitucional promulgado em 5 de outubro de 1988, com as alterações adotadas pelas Emendas constitucionais nos 1/1992 a 92/2016, pelo Decreto legislativo nº 186/2008 e pelas Emendas constitucionais de revisão nos 1 a 6/1994

Disponível, também, em formato impresso e digital (MOBI e PDF e EPUB)

Investigation of the spectroscopic properties of (Y0.92-xLa0.08Ndx)(2)O-3 transparent ceramics

The spectroscopic properties of (Y0.92-xLa0.08Ndx)(2)O-3 transparent ceramics were investigated. According to three intensity parameters (Omega(2),Omega(4),Omega(6)) fitted by the Judd-Ofelt theory, the spectroscopic quality parameter (X-Nd), branching ratio (beta(J,J')), and quantum efficiency (eta) of Nd3+ were determined. It was found that X-Nd of the host, owing to the additive La2O3, was decreased from 1.6 to 0.46; thus beta(J,11/2) was increased from 46% to 56.82%. A figure of merit of the specimens was discussed and compared with Nd:YAG transparent ceramic. (c) 2007 Optical Society of America.

Pacific Hagfish, Eptatretus stouti, and Black Hagfish, E. deani: The Oregon Fishery and Port Sampling Observations, 1988-92

In 1988, the Oregon Department of Fish and Wildlife began sampling and monitoring the development of a new fishery for Pacific hagfish, Eptatretus stouti, and black hagfish, E. deani. Hagfish landings by Oregon trap vessels have ranged from 11,695 kg in 1988 to 340,774 kg in 1992. Whole frozen fish were shipped to South Korea for the "eel skin" leather market. From 1988 through 1989, I sampled 924 Pacific hagfish and 897 black hagfish from commercial and research catches. Mean length of fish sampled from commercial landings was 39.6 cmf or Pacific hagfish and 34.5 cm for black hagfish. Weight-length relationships (W=aLb) were calculated for males and females of both species. Fifty percent maturity for male and female Pacific hagfish was 35 cm and 42 cm, respectively, while 50% maturityf or male and female black hagfish was 34 cm and 38 cm, respectively. Examination of gonads for both species indicated that spawning either occurs throughout the year or the spawning period is protracted. Mature females of both species had from one to three distinct sizes of eggs, but they usually carried only one group of eggs over 5 mm in length. Mature Pacific hagfish females averaged 28 eggs over 5 mm in length, and black hagfish females averaged 14 eggs over 5 mm in length. Hermaphroditism was found in 0.2% of the Pacific hagfish examined.

Climatic impacts of the 1991-92 Western winter

EXTRACT (SEE PDF FOR FULL ABSTRACT): The latest in a series of unusual winters affected the western United States during 1991-92. This report is primarily concerned with the 6 to 8 coolest months, with some consideration of the adjacent summer months. ... Much of the winter was characterized by "split flow" west of North America. As it approached the West Coast, the jet stream frequently diverged into a northern branch toward Panhandle Alaska and a second southern branch that dived south along the California coast and then eastward along the US-Mexican border. Repeatedly, storms approaching the West Coast were stretched north-to-south, losing their organization in the process.

The fisheries of Lake Wamala: a report on the fisheries resources surveys conducted during 1975/78 and 1988/92

Lake wamala was opened to commercial fishing in 1960. Interviews with the local fishermen during 1975/78 (Okaronon 1975, 1976, 1977, 1989) revealed that fishing for subsistence had been going on long before stocking was done. The subsistence fishing was conducted along rivers and at river mouths using basket traps (mainly made of papyrus stems), weirs and hooks and that the fish species caught were predominantly clarias (mudfish/male) and protopterus Lungfish/Mamba). These interviews did not, however, reveal the presence of tilapiine species in Lake wamala prior to stocking. These interviews did not however reveal the presence of tillapine species in lake wamala prior to stocking. Following the opening of the lake to commercial fishing in 1960, Lake Wamala provided a very profitable commercial fishery throughout the 1960s. However, during the early 1970s the fishermen started complaining of continued decline in catch rates from about 8 kg (15 fish) of O. niloticus per net per night if in 1966 to less than 1 kg per net per night by 1975.

Studies on geo-morphology, ecology and fish production of the 92 rivers of Rajshahi Division, Bangladesh

Geo-morphology, ecology and fish production of the 92 rivers of Rajshahi division have been presented in this paper. Fifteen rivers are dead and 11 rivers have severe erosion problem. Siltation has increased in 66 rivers and depth has decreased in 11 rivers. Sixty nine rivers are suffering from low flow conditions. Fish diversity has decreased in 20 rivers while fish production has declined in 75 rivers. A total of 31 fish species have extinct, 25 species are under threat of extinction and 43 species have low production. Siltation and pollution are the major causes of fish habitat loss. Recommendations are made to protect and conserve fish habitat and riverine fisheries of Rajshahi division.