996 resultados para 205-1254
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《中国力学学会史》是《中国学会史丛书》之一。是一部全面系统记述中国力学学会建立与发展历程的专著。 《中国力学学会史》全书30万字,书中不但重点对学会的初创情况、发展过程、组织建设、学术交流、分支机构等进行了专门介绍,还特别收录了记述学会重大活动情况的大事记、名人与学会发展的丰富资料和一些极有史料价值的历史照片,旨在反映学会在不同时期的活动概况及其在中国力学界中发挥的桥梁与纽带作用。 中国力学学会是中国科协的组成部分,也是我国著名的学术团体之一,仅以此书的编著出版,纪念中国科协成立50周年和中国力学学会成立50多周年。本书可供力学界和科技界有关部门及工作者、各学会相关人员、大专院校师生参阅,也可作为组织和开展国内外学术交流研究的参考资料。
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This report covers the 37th annual inventory of chinook salman, Oncorhynchus tshawytscha, spawner populations in the Sacramento-San Joaquin River system.-It is a compilation of reports estimating the fall-, winter-, late-fall-, and spring-run salmon spawner populations for streams which were surveyed. Estimates were made from counts of fish entering hatcheries and migrating past dams, froro surveys of dead and live fish and redds on spawning areas, and from aerial counts. The estimated 1989 total escapement of chinook salmon in the Central Valley was 205,990 fish. This total consisted of 181,864 fall-, 12,171 spring-, 539 winter-, and 11,416 late-fall-run spawners. All of the spring-, late-fall-, and winter-run salmon were estimated to be in the Sacramento River system, while 3,493 fish of the fall run were in the San Joaquin River system. Due to decreases of spawner populations in most Central Valley tributaries, the total 1989 salmon stock was 32% lower than in 1988; however, late-fall salmon in the upper Sacramento River had a run size similar to that of 1988. The winter run in the mainstem Sacramento River was at a record low level. (PDF contains 44 pages.)
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En el presente artículo se ofrecen los resultados extraídos de una investigación llevada a cabo durante el curso académico 2002-2003 en todos los centros universitarios que componen el Campus de Gipuzkoa. A través de una encuesta dirigida a 1216 estudiantes de últimos cursos tratan de evaluar la actitud y usos frente a las Tecnologías de la Información y la Comunicación(TIC). Los datos que se ofrecen constituyen un punto de referencia a partir del cual se podrá controlar el progreso y plantear recomendaciones de acciones proactivas a llevar a cabo en el futuro.
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Apenas empresas nacionais poderão explorar mineração em áreas de fronteiras, estratégicas e em territórios indígenas. Também foram discutidas outras emendas que propõem a nacionalização total do subsolo brasileiro serão decididas no voto. Lei complementar definirá as áreas estratégicas. Empresas nacionais terão preferência no transporte de cabotagem e no transporte marítimo internacional. O governo brasileiro deverá comprar navios nos estaleiros brasileiros. É função do Estado incentivar a organização dos garimpeiros em cooperativas. Lei Ordinária disporá sobre a política tarifária de serviços públicos. A seguir foi votada o artigo 205. Estabelece que jazidas, minas, recursos minerais e potenciais recursos energia hidráulica são propriedades da União.
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13 p.
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Lei n. 12.965, de 23 de abril de 2014, que estabelece princípios, garantias, direitos e deveres para o uso da internet no Brasil.
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Indole concentrations of 114 samples of tropical shrimp, 3 samples of crayfish, and 3 samples of cold water crustaceans were determined. Cold water crustaceans contained less than 15 μg/kg indole, whereas crayfish contained between 62 and 123 μg indole/kg. In 81 samples (70 %) of tropical shrimp indole content was less than 50 μg/kg, but in 12 samples (11 %) indole content exceeded 250 μg/kg. Different batches of some products with high indole levels as well as of some products with low indole levels were analysed. Except for one sample high as well as low indole levels could be confirmed. Highest indole concentrations were determined in samples which origin was specified as South Pacific, Indo-Pacific, Malaysia, India and India/Vietnam
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Enpresen Administrazio eta Zuzendaritzako Lizentziaturako Ikerkuntza Operatiboa irakasgaia gainditu behar duten ikasleentzat, eta baita ere, gai batzuetan, gradu berrietan Ikerkuntza Operatiboa ikasiko dutenentzat. Enpresen Administrazio eta Zuzendaritzako Lizentziaturako Ikerketa Operatiboa irakasgaiko azken hamar urteetan jarri diren azterketak eta haien erantzunak aurkituko dituzue. Lehenengo zatian, egin gabeko azterketak daude, ordena kronologikoan, zaharrenetik berrienera, eta bigarren zatian, erantzunak daude, ordena kronologikoan ere. Horrela, programaren gai guztietako ariketak elkarrekin aurkituko dituzue.
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Details are given of fisheries activities carried out in Bakolori Reservoir within the context of many and varied functions of Sokoto Rima River Basin Development Authority. Experimental fishing was conducted for 55 days in 1979 when the reservoir was only one year old and the exercise continued in 1980 and 1981 also for 85 and 52 days respectively. During the exercise, the catch per unit effort showed an increasing trend with increasing efforts by four times to that of the initial. The fish harvest was 1.205 kg/day when 3.8 nets were operated in 1979, this went up to 3.2 kg when the number of nets were increased to 8.37/day in 1980. This increasing trend continued in 1981 season also when 16.15 nets caught 5.756 kg fish per day. A direct relationship was observed in the fishing efforts and catch. Tilapia, Clarias, Labeo, Schilbe and Synodontis spp, were the most predominant fish species in the catch and contributed more than 97% of the total fish harvest
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Trace metals constitute a major form of water pollutant that can adversely affect fish production. The potentially toxic metals have been identified as lead, zinc, copper, arsenic, antimony, mercury beryllium, barium, cadmium, chromium, nickel, selenium among others. Preliminary laboratory studies have been directed to the determination of traces of lead in the aquatic biota and its toxicity. There are indications that the levels reported in effluents from some of the industries may be above the tolerant limits of local fish species and organisms that make up their food. Metal pollution could become a serious problem to freshwater fisheries in the future as a result of increasing urbanization and industrialization, unless efforts are made to prevent it
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205 p.