Ciências Exatas e da Terra: Últimas Submissões
Resultados 1-10 de 5955
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Utilização de modelagem numérica para o estudo da dispersão de poluentes emitidos pela Usina Termoelétrica Presidente Médici
(2007) [Artigo de periódico]The purpose of the present study is to evaluate the atmospheric behavior in the dispersion of the pollutants SO2, PM10 and NOx emitted by the President Medici power plant in Candiota, RS. The RAMS atmospheric model was ... -
Planejamento territorial do COSIPLAN/IIRSA : avanços, retrocessos e perspectivas
(2022) [Artigo de periódico]O planejamento econômico ganhou dimensão internacional com a Revolução Russa sendo criticado por neoliberais na década de 1940. A ideia do planejamento econômico havia chegado à América Latina na década de 1920 sendo ... -
Identificação de hidrocarbonetos aromáticos polinucleados em amostras de petróleo brasileiro
(1991) [Artigo de periódico] -
Oligomerização de propeno catalisada por complexos dicatiônicos de níquel : efeito de co-catalisadores do tipo alquilalumínio
(1996) [Artigo de periódico]Propene is oligomerized in the presence of Ni(MeCN)₆(BF₄)₂ and alkylaluminum compounds like Al₂Et₆₋nCln (n = 0, 2, 3 or 4). The catalyst system perfomance is determinated by the cocatalyst type. Under mild reaction conditions ... -
Uso de RMN de ¹3C e de 3¹P no acompanhamento da síntese de fosfinitos e de catalisadores catiônicos de ródio
(1996) [Artigo de periódico]Phosphinites and thiophosfites derived from bicyclic and polycylic strained molecules like norbonanes, endo-endo and endo-exo tetracyclic dodecanes compounds, and their respective cationic Rhodium catalysis, were prepared. ... -
Disproportionation of rosin from Pinus elliotti : obtention of emulsifier for polymerization
(1995) [Artigo de periódico]The pulverized, molten or solubilized, rosin from Pinus elliotti was disproportionated by using S, NaI, S and I₂ or Pd/C as catalysts. The disproportionated rosin was saponified in aqueous or alcoholic KOH solutions. The ... -
Placas cerâmicas contendo lodo de ETA e cinza de casca de arroz: correlação de suas propriedades físico-químicas com sua microestrutura
(2018) [Artigo de periódico]Pressed ceramic plates were made from mixtures with different proportions containing kaolinite clay, silica extracted from the rice husk ash after controlled burning at controlled temperature and sludge from a water treatment ... -
Isolation and identification of toxic chlorinated organic compounds present in black liquor of bleached cellulose pulp from Southern Brazil
(1989) [Artigo de periódico]Chemical components of untreated black liquor of cellulose pulp from Southern Brazil were extracted using macromolecular XAD-4 resin. The following compounds were identified qualitatively and/or quantitatively by capillary ... -
The preparation of keim's ethylene oligomerization catalyst : an introductory experiment in organometallic chemistry
(1988) [Artigo de periódico]A convenient sequence of reactions leading to Keim's ethylene polymerization catalyst [Ni(Ph)(PPh₃){Ph₂PCHC(O)Ph}] is proposed here as a practical exercise for undergraduate students. The reactions are straightforward and ... -
Metátese catalítica de olefinas
(1993) [Artigo de periódico]The metathesis olefin reaction was reviewed. All the different types of reactions in this field were covered. Reactions of non-functionalized and functionalized olefins were exemplified. The importance of these kind of ...