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Amido a partir de bambu
Azzini, Anísio;
Bragantia , 1984, DOI: 10.1590/S0006-87051984000100005
Abstract: in bamboo culms of the species reported as guadua flabellata were determined the contents of starch, fibrous fraction, parenchymatous fractions and water soluble fractions. the height and diameter of the bamboo culms were also determined. the results showed that the average content of extracted starch was 8.53% (over dry material). this content corresponds to about 59% of the fractions and 32% of the total starch present in the bamboo culm. the fibrous fractions and water soluble fractions were, respectively 61.76% and 23.05%. regarding to culm dimensions, this species can be considered as a middle sized culm.
Participación y tendencias políticas en estudiantes universitarios: el caso de la Universidad de Chile
Carrasco Azzini,Giovanni;
Ultima década , 2010, DOI: 10.4067/S0718-22362010000100005
Abstract: for years in our country, the trend and political participation of university students was key to the various governments that took place until 1973. the university of chile, in both the first and largest higher education institution in the country, was always seen with a special interest, even stating that ?what happened on the date, happened in chile?. however, once started the authoritarian regime in our country, the relationship defined above is no longer such until today. this research, exploratory qualitative aims to analyze the possible relationships between national policy and university policy, and explain the reasons for which, apparently, the political orientation of the student organizations at the university of chile and do not reflect reality national.
Resultados preliminares s?bre o estudo do quenafe como matéria-prima para papel
Ciaramello, Dirceu;Azzini, Anísio;
Bragantia , 1971, DOI: 10.1590/S0006-87051971000100003
Abstract: the production of pulping raw material for the paper industry of four varieties of kenaf (hibiscus cannabinus l.) sown at three spacings (30, 40 and 50 cm) was compared in a field trial made at the experimental center, campinas, sp. the analysis of variance of obtained data showed no differences between production of varieties or/and spacings. as an average, the yield was 29.4 metric ton of green stems which corresponded to 6.7 ton of dried weight per hectare. determinations of physical properties indicated that basic density of stems is only 0.13 g/cm3 and that bast fibers are identical to those of softwood. wood fibers, however, are shorter and with a larger lumen. coockings by the sodium sulfate and neutral sodium sulfite processes gave pulp of reasonable quality in bursting, folding and tensile strengths but weak in the tearing and with low porosity.
Bambu como matéria-prima para papel: V - Estudos s?bre o emprêgo de quatro espécies de Dendrocalamus,na produ??o de celulose sulfato
Ciaramello, Dirceu;Azzini, Anísio;
Bragantia , 1971, DOI: 10.1590/S0006-87051971000200016
Abstract: four bamboo species of dendrocalamus (d. asper, d. latiflorus, d. giganteus and d. strictus), were studied to determine their feasibility for pulp and paper production by the sulphate process. data was taken on culm characteristics, as well as basic density and fiber dimensions on sample basis. five cookings involving the four species were carried out in electrically heated rotary autoclave of 20 litres capacity at 14% of active alkali as na2o, 25% of sulfidity 1:4 ratio of material to liquor and maximum temperature of 160 ± 2°c during 60 minutes. unbleached yield and permanganate number of pulps were determined. handmade sheets with 60 g/s.m. were conditioned at 65% rh and 21oc and their strenght properties tested. the results indicated that d. giganteus produced 39.10% of unbleached pulp yield and also superior quality for most of the paper strength properties considered on this research.
Bambu como matéria-prima para papel: IV - Estudos s?bre o emprêgo de cinco espécies de Bambusa,na produ??o de celulose sulfato
Azzini, Anísio;Ciaramello, Dirceu;
Bragantia , 1971, DOI: 10.1590/S0006-87051971000200015
Abstract: five bamboo species, very similar in the agronomic features, were studied in the production of kraft pulp. all of them have culms with about 9 m in height, 4-5 cm in diameter and weight of 4-5 kg, growing very well in the soil and climate conditions of s?o paulo state. determinations of the basic density of culms and dimension of fibres were made. chips were obtained mechanically and the cookings were made by the sulfate process at 160°c for l hour, using 14% na20 and 25% sul-phidity. bambusa textilis and b. tuldoides which yielded, respectively 43.75% and 42.53% of unbleached pulp were statistically superior to b. malingensis and b. dissimulator, which yielded only 35.82% and 36.57%, but have no difference relating to b. ventricosa which yielded 41.74%. handmade sheets of 60 g/s.m. were tested according to abcp and tappi methods. the results showed that b. textilis was the best in the tearing, b. tuldoides in the folding and b. dissimulator in the mullen and tensile strength.
Bambu como matéria-prima para papel: III - Estudos s?bre o emprego de quatro espécies de Bambusa,na produ??o de celulose sulfato
Ciaramello, Dirceu;Azzini, Anísio;
Bragantia , 1971, DOI: 10.1590/S0006-87051971000200011
Abstract: culms 2-3 years old of bambusa nutans, b. tulda, b. stenostachya and b. beecheyana were studied in the production of kraft pulp. all these species proved to grow well in the soil and climate conditions of s?o paulo state. dimensions of the culms, their basic density and the dimension of the fibers are given. coockings, in number of 5 for each specie, were made by the sulfate process for 60 minutes at 160 ± 2°c, using 13.55% naoh and 4.4% na2s. the results showed differences among species, relating to the yield and permanganate number of the pulp. the best yield was 42.35% of umbleached cellulose with 15.7 np for bambusa tulda and the worst was 35.27 with 17.24 np, for bambusa beecheyana. handmade sheets, with 60 g/s.m., were submited to the mechanical tests showing effect of species on the quality of pulp.
Ultima Década , 2010,
Abstract: Durante a os, en nuestro país la tendencia y la participación política de los estudiantes universitarios fue clave para los diversos gobiernos acaecidos hasta 1973. La Universidad de Chile, en tanto la primera y más grande institución de educación superior del país, siempre fue vista con especial interés, afirmándose incluso que lo que sucedía en la FECH,1 sucedía en Chile . Sin embargo, una vez que se inició el régimen autoritario en nuestro país la relación anteriormente se alada ya no fue tal, hasta el día de hoy. Esta investigación, de carácter exploratorio cualitativo, pretende analizar las posibles relaciones existentes entre la política nacional y la política universitaria, y explicar las causas por las cuales, aparentemente, la orientación política de las organizaciones estudiantiles de la Universidad de Chile ya no reflejan la realidad nacional.
Método de determina??o de a?úcares aldeídicos a partir do amido de bambu
Azzini, Anísio;Queiroz, Maria Carla;
Bragantia , 1985, DOI: 10.1590/S0006-87051985000100036
Abstract: bamboo starch was hydrolized under different saccharification conditions using hydrochloric acid at several concentrations (0.5;1.5; 2.5; 5.0 and 10.0%) and reaction time (30; 60 and 90 min). the results showed that bamboo starch was completely hydrolized by hydrochloric acid solution (2.5 %) after 60 min of reaction. the aldehydic sugars obtained, were determined by a volumetric method based on sugar oxidation by a ki/i2 solution and tritation of the i2 excess with a solution of na2s2o3. the method is rapid, easy, precise, and can be used routinely for determination of aldehydic sugars (glucose) after saccharification.
Enraizamento de propágulos de bambu em diferentes substratos
Azzini, Anísio;Salgado, Antonio Luiz de Barros;
Bragantia , 1993, DOI: 10.1590/S0006-87051993000200003
Abstract: this study determined the rooting level of three meristematic materials of bamboo culm (culm plaques, primary sprout buds and secondary buds) planted in different substrates, prepared with a misture of organic material, ashes and fine sand. the meristematic materials were obtained from two years culms of bambusa vulgaris schrad, collected at a plantation at the "centro experimental de campinas", state of s?o paulo, brazil. the experiment was carried out under a plastic metting during 110 days. the containers for substrates were of the following dimensions: 50 x 30 x 10 cm, respectively by length, width and height. the highest rooting percentage was obtained in the culm plaque (59.7%) followed by primary sprout buds (41.0%) and secondary buds (3.5%). the culm plaques can be easily obtained in great quantity during the normal harvest and in function of their dimension and form they easily can be stored and transported. the utilization of culm plaques represents a new method of asexual propagation of bambusa vulgaris, with a large advantage in comparison with the conventional methods.
Sacarifica??o da serragem de bambu visando ao estabelecimento de um método de determina??o de amido
Azzini, Anísio;Arruda, Maria Carla Queiroz;
Bragantia , 1986, DOI: 10.1590/S0006-87051986000100002
Abstract: saccharification conditions of bamboo sawing (bambusa vulgaris schrad.) were determined for the stablishment of an analytic method for starch determination in bamboo culm. the results showed that the best conditions for sawing saccharification were obtained with a 2.0% (v/v) sulfuric acid solution after 60 minutes of reaction under heating, using the relationship 1:30 (w/v) between the quantity of bamboo sawing and the volume of the acid solution. in this conditions the starch content in the bamboo culm was calculated by the following expressions: a = (gh - ga) x 0.9, where: a = starch content in the bamboo sawing, expressed in percentage (oven dry); gh = glucose yield, obtained from starch saccharification, expressed in percentage (oven dry); ga = glucose content in the bamboo sawing, expressed in percentage (oven dry); 0.9 = conversion factor from glucose to starch.
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