Monitoramento do tempo de prensagem e do comportamento da temperatura através da espessura de painéis LVL (Laminated veneer lumber)

The aim of this study was to analyze the behavior of the flow of heat (temperature) through the thickness of panels LVL (Laminated veneer lumber) produced with phenol formaldehyde adhesive, in laboratorial and industrial scales. Experimental program was conducted with five LVL panels (three produced in laboratorial scale and two in industrial scale) with different arrangements of a mix of commercial veneers from tropical pinus from the south region of Sao Paulo State, Brazil, bonded using phenol formaldehyde adhesive. The temperature inside the panels during the pressing process was evaluated using thermocouples type T (cooper-constantan), installed mostly in the center of the glue lines and connected to a data acquisition system. The graphics of temperature as a function of the time showed a gradual increase of temperature up to pre-set values, remaining constant from them. The temperature reached at the center of the panels was adequate to promote the curing of the adhesive. These pre-set values were similar to the minimum values presented by other authors and manufacturers of these adhesives that affirm that temperatures above 100ºC at the center of laminated panels bonded with phenolic adhesives are sufficient to ensure proper cure of the resin. The time necessary for curing of the adhesives confirmed the validity of practical expressions provided by adhesive manufacturers.

Qualidade pós-colheita dos frutos de jabuticaba tratada por hidrotermia

This study aimed to evaluate the hydrothermal effect on conservation of two jabuticaba fruits, Myrciaria jabuticaba Vell. Berg. Fruits were subjected to thermal treatment by 10 min at 5, 10, 15, 20 and 25 ºC and wrapped into expanded polystyrene trays, stored at 9 ºC and 85-90% RH, being evaluated every 5 d. Shelf life, weight loss, respiratory rate, soluble solids, titrable acidity, texture, C vitamin, pH, total and soluble pectin and polypheno loxidase activity were evaluated. Lower shelf life was observed for control treatment (31 d) and largest was found at 15, 20 and 25 ºC (45 d). A sligthly delay was observed in the breathing pick at 15, 20 and 25 ºC at 25 d and not in the 20 d as observed in the other treatments. Soluble solids increased with storage time for all of temperature treatment, but at 15, 20 and 25 ºC increase was smaller. Texture an C vitamin were higher in fruits stored at 25 ºC. Soluble pectin was smaller at the end of storage period, at temperatures of 20 and 25 ºC. Polyphenoloxidase activity decreased along 30 d regardless storage temperature. Treatments at 20 and 25 ºC were the most effective for mainteining posthaverst quality of the jabuticaba fruits.

Influência da temperatura no crescimento micelial de linhagens de Lentinula edodes

The objective of the present work was to evaluate the in vitro mycelial growth of ten L. edodes strains (LED 12, LED 20, LED 25, LED 27, LED 33, LED 35, LED 51, LED 55, LED 58 and LED 75) submitted to the temperatures of 15, 20 and 25 ºC. An agar medium prepared with eucalyptus wood extract and soy bran was used and radial measurement of the mycelial growth of L. edodes strains was performed. The experimental design was totally randomized, in a 10 x 3 factorial scheme. Each treatment corresponded to a Petri plate and consisted of 5 repetitions. It was verified that L. edodes growth is influenced by the incubation temperature, that is the temperature of 25 ºC was the most favorable for the mycelial growth of all L. edodes strains, especially for LE 75, LE 55, LE 33 and LE 12 strains, which obtained the highest mycelial growth averages at 25 ºC at the end of the cultivation cycle.

Produção semissólida de metarhizium anisopliae e beauveria bassiana em diferentes substratos e efeito da radiação ultravioleta e da temperatura sobre propágulos desses entomopatógenos

The present study was aimed to evaluate different (semi-solid) media for the production of Metarhizium anisopliae and Beauveria bassiana propagules, and to evaluate the tolerance of these propagules to ultraviolet radiation and temperature. The experiments were performed at the Biological Control Laboratory of the Instituto Biológico at Campinas, São Paulo, Brazil. For both fungi, 6 repetitions were performed for each of the 17 treatments: corn starch, full rice, parboiled rice, type-1 rice, type-2 rice, oat flakes, canjiquinha [grits], wheat flour, raw cassava flour, yellow corn flour, special wheat flour, corn flour, corn in grains, cassava starch, soy in grains, crushed wheat, and turf. The viability analysis was done in plastic plates containing BDA. For the bioassays involving exposure to ultraviolet light and temperature, BDA was also used for viability analysis, and each treatment was exposed to the UV radiation for 0, 25 and 50 seconds, the temperature exposure being at 20, 25, 30 and 35º C. Using a Potter tower, 2 mL of fungus suspension from each treatment was inoculated to the Diatraea saccharalis caterpillars. Regarding the sporulation, the largest concentrations of M. anisopliae and B. bassiana were found for the treatments with parboiled rice, type-1 rice, type-2 rice, yellow corn flour, corn flour and crushed wheat. The viability of all treatments was superior to 94.00%. Also, the longer the duration of the exposition to the UV, the smaller the number of fertile conidia. At 35o C, a significant loss of conidia viability was observed, and all the treatments presented some level of virulence.

Qualidade pós-colheita de abacates "hass" mantidos em temperatura ambiente e tratados com diferentes radiações

This study aimed the avocado ‘Hass’ conservation with the use of radiation. We performed two experiments: Experiment I – fruits irradiated with different doses of cobalt-60 gamma irradiation(0,0; 0,2; 0,4; 0,6 e 1,0 kGy); Experiment II – fruit irradiated by electron accelerator in different doses (0,0; 0,48; 0,8; 1,12 e 1,45 MeV), both maintained at room temperature of 21±1 °C and at relative humidity of 79±5 %. Antioxidant capacity, total phenolic compounds, fresh weight loss, and respiration rate evaluation were performed every three days for 12 days. The experimental design was completely randomized with three replicates per treatment. For statistical analysis, the Tukey test at 5% probability was employed. Under the conditions in which the experiments were performed, the results showed that the gamma radiation use retained the fruits for 12 days, regardless the doses applied. The radiation by electron accelerator use also promote the fruits preservation, regardless the doses employed.

Desenvolvimento e avaliação de um sistema de liberação sustentada de gentamicina em biomembranas de látex natural

Pós-graduação em Biociências - FCLAS

Modelos de Schwinger, Thirring e Kondo à temperatura finita: um estudo

Pós-graduação em Física - IFT

Influência da temperatura e do termoperíodo sobre a taxa metabólica de repouso em cascavéis, Crotalus durissus (Serpentes: Viperidae)

Snakes are ectothermic animals and, therefore, their physiological functions are strongly affected by temperature. For instance, the resting metabolic rate (RMR) of this animals increase with the rise in body temperature. However, metabolic determinations in ectothermic organisms, including snakes, are generally made by submitting the animals to constant temperature regimes. This experimental procedure, although widely used, accepted and certainly suitable in several cases, submit the animals to a very different situation from that experienced by them in nature. In fact, ectothermics are known by presenting extensive variations in their body temperatures trough the day and/or seasons. If this disagreement between the thermal biology of the animals and the experimental conditions, for instance over the circadian cycle, affects the determinations of metabolic rates of ectotherm animals, remains quite uncertain. Thus, this study aimed to test the effects of different thermal regimes (fluctuating vs constant) in different temperature ranges over the TMR of rattlesnakes (Crotalus durissus). Therefore, the TMR of rattlesnakes was measured by the oxygen consumption rates ( V O2) in the constant temperatures of 15°C, 20°C, 25°C, 30°C and 35°C. For fluctuating regimes, snakes were measured in thermoperiods of 12/12 hours, as follows: 15°C and 25°C; 20°C and 30°C; 25°C and 35°C. Our results show that the RMR of C. durissus rises as the temperature increases, regardless of the thermal regime. The obtained RMR in the constant regimes of 20°C and 25°C was not different from that measured in the correspondent fluctuating regimes (i.e., 15 - 25°C e 20 - 30°C). However, at constant 30°C, the RMR was significantly higher than that obtained in the 30°C fluctuating regime (25 - 35ºC). This indicates that the potential effects in submitting of snakes to different thermal regimes of its thermal biology become more important with...

As características da temperatura do ar em bairros com produção do espaço urbano distintas: uma análise do Parque Higienópolis e Jd. Morada do Sol em Presidente Prudente-SP

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Produção e caracterização parcial da xilanase produzida por Aspergillus sp

As xilanases são enzimas que hidrolisam as ligações 1,4-β-xilosídicas da xilana e que possuem potencial biotecnológico em vários processos industriais, como na clarificação de sucos e vinhos, na fabricação de pães, na produção de biocombustíveis e no tratamento das polpas celulósicas. Além disso, os produtos de hidrólise da xilana, xilooligossacarídeos, podem ser utilizados como ingredientes prebióticos, ou seja, ingredientes nutricionais não digeríveis que estimulam seletivamente a proliferação e a atividade de bactérias benéficas do cólon. O uso de enzimas microbianas nas indústrias se dá devido às suas diversas vantagens sobre os métodos químicos e à facilidade de obtenção do microrganismo. Assim, os objetivos deste trabalho foram: produzir e caracterizar parcialmente a xilanase de Aspergillus sp isolado de pó de café utilizado, purificar parcialmente a enzima produzida e analisar os produtos de hidrólise da xilana. O Aspergillus sp mostrou-se bom produtor de xilanase quando o pó de sabugo de milho foi utilizado como fonte de carbono e a xilanase produzida apresentou melhor atividade específica quando o período de cultivo foi de 168 horas. Os processos de precipitação de proteínas e diálise promoveram o aumento da atividade específica do extrato. A xilanase de Aspergillus sp apresentou pH e temperatura de máxima atividade semelhantes aos de produzidas por Aspergillus niger isolados de outras fontes. A hidrólise da xilana produziu xilose e xilooligossacarídeos. Além da xilanase, o fungo revelou ser produtor de outras proteínas que podem ser estudadas em pesquisas futuras.

Análise de um trocador de calor tipo serpentina de uma planta de hipoclorito de sódio

This study aims to analyze the capacity of a helical coil heat exchanger to reach the requested heat transfer rates by a sodium hypochlorite production process. This heat exchanger was installed in an experimental way in order to reuse a source of low-temperatures water in such a way to become a more economical alternative than the existing cooling tower. Firstly, the concepts related to the theory of heat transfer applicable to the case were introduced. Then, the mapping of the main information about the production process and the technical specification of the current cooling system equipment's was realized. Using the dimensions of the heat exchanger installed today as reference, the calculations for determining the ideal length of the coil to different flows of hot fluid were performed. Finally, it was concluded that the heat exchanger currently employed does not provide heat transfer rates required for the maximum flow rate value supported by the cooling tower

Umidificação e aquecimento do gás inalado em estação de anestesia com baixo fluxo de gases frescos com ou sem isolamento térmico do circuito ventilatório e com ou sem permutador de umidade e temperatura

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Levantamento de nematoides entomopatogênicos em áreas agrícolas e influência da temperatura e do substrato na sobrevivência, multiplicação e armazenamento

Pós-graduação em Agronomia (Proteção de Plantas) - FCA