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Search Results: 1 - 10 of 3449 matches for " Hermes Geraldo; "
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Redu??o da evapora??o de gotículas contendo herbicida, com emprego de oxietileno docosanol
Corrêa, Hermes Geraldo;
Bragantia , 1985, DOI: 10.1590/S0006-87051985000100013
Abstract: this experiment was conducted to test the use of oxiethylene docosanol (o.e.d.) to reduce the loss of water during the spray of contact herbicide (bentazone). the droplets were produced under controlled conditions of temperature, relative humidity and absence of wind. the loss of volume was calculated by measuring the reduction of droplet diameter after a fall of 4.2m. when the herbicide solution wlthout o.e.d. was sprayed there was a loss of 63% of the inicial volume for the small droplets (141 micra) and 30% for the large droplets (216 micra). when o.e.d. was added to the herbicide the volume loss was reduced to 15% and 9%, respectively, for the smaller (134 micra) and larger droplets (216 micra).
Desgaste de bicos de pulveriza??o pelo uso de formula??es cúpricas
Corrêa, Hermes Geraldo;Lorena Neto, Bernardo;
Bragantia , 1976, DOI: 10.1590/S0006-87051976000200005
Abstract: in this paper it was studied the abrasive action of a copper oxichloride spray mixture on some disc type hollow cone spray nozzles under usual pressures. changes in spray nozzles characteristics were noticed during the work as increasing in the flow-rate, decreasing in the spraying angle, and filling of the hollow cone with high density of spray droplets. the flow rate change is of main importance because if neglected it may contribute to excessive deposition of pesticides on the plants. beyond the pesticides wastage it implies in great hazzard to environmental contamination and phyto-toxicity. among the nozzles components tested the core showed higher wearing. the one made of brass was more sensitive to abrasive action of spray mixture than nylon ones, while that of stainless steel showed to be the strengthest. the influence of the nozzles wearing on the flow-rate, angle cone, and cone spray pattern was analyzed in function of the time of operation. to determine the droplet parameters, droplet analyses of new spray nozzles and after 100 hours of use were made.
Produ??o e utiliza??o de gotas com diametro uniforme
Corrêa, Hermes Geraldo;Held, José de;
Bragantia , 1982, DOI: 10.1590/S0006-87051982000100001
Abstract: this paper deals with the construction and use of a spinning disc atomizer that produces uniformly sized droplets. the device has a special use in the determination of the spread factor on several sampling surfaces (kromekote paper, glass, plastic etc.). furthermore, it permits the study of spraying performance, the inoculation of known spore doses of fungi and observations about toxical effects of pesticides on vegetables and animals. the apparatus showed a narrow droplet size spectrum, with a coefficient of variation about 2.36%. the spread factor of rodhamine b 0.2% in water solution showed to be of 1.32 and 1.71, respectively, when droplets of 98 and 325 micra were used, on kromekote paper. with malathion, 96% of active ingredient, the spread factors on kromekote paper were 4.09 and 5.18 when droplets of 80 and 217 micra were spread. melamine (fórmica) showed a small variation in spread factor when sprayed with malathion.
Influência do tempo de pulveriza??o com aparelho pneumático costal, na cobertura foliar do cafeeiro
Lorena Neto, Bernardo;Corrêa, Hermes Geraldo;
Bragantia , 1976, DOI: 10.1590/S0006-87051976000200002
Abstract: leaf coverage in coffee plant was studied as a function of the spraying time interval. four trees in a hole received 300 ml of spray in 20, 30 or 40 seconds, in a randomized blocks design with five replications. results showed that 30 seconds is enough time to spray the four coffee plants of a hole under the trial conditions.
Análise em laboratório da redu??o da evapora??o de gotículas para pulveriza??es agrícolas
Corrêa, Hermes Geraldo;Maziero, José Valdemar Gonzalez;
Bragantia , 1980, DOI: 10.1590/S0006-87051980000100010
Abstract: this paper refers to the research of techniques for the measuring evaporation of droplet under laboratory controlled conditions. one aims to select chemical evaporation suppressors for further practical usage. four chemical compounds mixed with the spray mixture were investigated and the evaporation speeds were compared with that of pure water. out of the four, only the o.e.d. (particularly indicated for spraying) performed satisfactory results, reducing evaporation rate about thirty times. so its use land wide swath air blast sprayer as well as in aerial spraying may have a good chance to succeed.
Análise das deposi??es da pulveriza??o aérea simulando a aplica??o de Metarhizium anisopliae (Metsch) na cultura da cana-de-a?úcar
Corrêa, Hermes Geraldo;Messias, Claudio Luís;Carvalho, José Bartolomeu Higinode;Bataglia, Ondino Cleante;
Bragantia , 1992, DOI: 10.1590/S0006-87051992000100013
Abstract: biological control of spitthebug, mahanarva posticata (stal) in sugarcane crop has been demonstrated possible and effective. particular conditions in northeastern of brazil, where this pest causes severe damage, contribute to make aerial spraying suitable. nevertheless, some good results in pest control are alternated with unsatisfactory ones. some doubts on aerial spray application technology used have arisen, since technical information obtained in this field are scarce. this trial was carried out in alagoas state, brazil, in 30-7-1985 with the aim of improving the efficiency of aerial application of the above biological pesticide mentioned. this paper presents some spray deposit patterns obtained with the brazilian aircraft, namely ipanema emb 201-a. the aerial spray application using this brazilian aircraft and lane separations of 20 m, gave recovery of 44.5%, while 60% of it was lost in the soil. there fore, only 18% of the spray application was effectively deposited on plant canopy.
Depósitos de calda obtidos com a aplica??o aérea de defensivos na cultura da banana
Corrêa, Hermes Geraldo;Benez, Sergio Hugo;Berton, Ronaldo S.;Sáes, Luís Alberto;
Bragantia , 2004, DOI: 10.1590/S0006-87052004000100012
Abstract: aiming to improve the efficacy of pesticide aerial applications in banana crop, a survey of the deposits on the total line of an application was performed. the studies were carried out in registro, state of s?o paulo, brazil, in the region named "vale do ribeira". an ipanema agricultural aircraft, model 201-a, equipped with four micronairs au 3000 was used to apply a dosage of 13.8 l.ha-1. as pesticide, propiconazole, a fungicide at 3% concentration, was mixed with spray oil. the spray mixture deposited was determined through the amount of copper oxicloride, which was added to mix via atomic absorption spectrofotometry technique. flights in three differents meteorological conditions were carried out and the droplet samples taken above the plants and on the ground. the differences between those two deposit values were considered to be caught by the banana crop. the maximum deposits above plants in the first, second and third applications were respectively 12.5, 11.6 and 9.1 l.ha-1, while on the plants they reached 9.1; 10.1 and 7.1 l.ha-1. the droplet sampled above the crop in the first, second and third flights showed an average volume median diameter (vmd) for the different positions relative to the line of flight of 181, 219 and 275 mm.
Crescimento de mudas de maracujázeiro-amarelo em resposta à aduba??o com superfosfato simples e pó de rocha
Prates, Fabiano Barbosa de Souza;Veloso, Hermes Soares;Sampaio, Regynaldo Arruda;Zuba Junior, Geraldo Ribeiro;Lopes, Paulo Sérgio Nascimento;Fernandes, Luiz Arnaldo;Maio, Marck Morais;
Revista Ceres , 2010, DOI: 10.1590/S0034-737X2010000200016
Abstract: research with powder rock have shown the potential of some residues in promoting the mineral enrichment of soils, a practice defined as ground basalt soil. this study aimed to evaluate the growth of seedlings of yellow passion fruit (passiflora edulis sims f. flavicarpa deg.) in response to fertilization with simple superphosphate and powder rock. the experiment was conducted from january to april 2006 in a greenhouse of the institute of agricultural sciences, federal university of minas gerais (ufmg-ica), located in montes claros/mg, brazil. the treatments were arranged in a factorial 2 x 5, in a randomized block design with 3 replicates, corresponding to the addition to the substrate of 2 doses of rock powder and 5 doses of simple superphosphate. the evaluated variables were: plant height, stem diameter, number of leaves per plant, leaf area, root fresh and dry matter, shoot fresh and dry matter and phosphorus content in the plant. the results indicate an increase in seedling growth with increasing levels of simple superphosphate and decrease of the effect of the phosphate fertilizer with the addition of powder rock to the substrate, possibly related to phenomena of adsorption by iron oxides and amorphous and/or carbonates, considering that the powder rock came from the disintegration of slate, marble and granite. the simple superphosphate dose, without the addition of powder rock, to produce better quality seedlings, should range from 3.0 to 6.5 kg m-3, whereas with the addition of powder rock, should range from 6.0 to at least 10.0 kg m-3.
Plastinación, una Herramienta Adicional para la Ense?anza de la Anatomía
International Journal of Morphology , 2006, DOI: 10.4067/S0717-95022006000400029
Abstract: in our department of anatomy at the school of medicine, we have introduced a plastination laboratory with the purpose of better preservation of the cadaveric material. in the impregnation of the specimens we use silicone polimer which is handle at room temperature. this way we get the best producción of plastinated material either in silicone or polyester resin. during the last tree years we have plastinated 300 pieces in silicone and 85 pieces in polyester resin. all of these material have been used to teach anatomy and neuroanatomy to medical students, nurses, and residents in neurology, radiology, anesthesia, and otorinolaryngology. besides the traditional dissection, the studens have an important number of anatomical preparations for their human body anatomical learning
Plastinación, una Herramienta Adicional para la Ense anza de la Anatomía Plastination an Additional Tool to Teach Anatomy
Hermes Bravo
International Journal of Morphology , 2006,
Abstract: En nuestro Departamento de Anatomía de la Escuela de Medicina hemos implementado un laboratorio de plastinación, con el fin de aprovechar eficientemente el material cadavérico disponible. Para tal efecto, utilizamos polímeros de silicona que se trabajan a temperatura ambiente. Esto nos ha permitido maximizar los procesos de producción de plastinados. De hecho, en los tres a os de funcionamiento de nuestro laboratorio, hemos realizado 300 plastinados en silicona y 85 en resina poliéster. Todos ellos han sido incorporados a la docencia de los cursos de pregrado de Anatomía y Neuroanatomía para Medicina, de Anatomía para Enfermería y a los cursos de postítulo para los Becados de Neurología - Neurocirugía, de Radiología, de Anestesiología y de Otorrinolaringología. Esto ha significado que además, de las disecciones tradicionales, los alumnos puedan contar con un número significativamente mayor de preparados anatómicos disponibles en los pasos prácticos, situación muy apreciada por ellos, dado que están concientes de disponer de este material es muy importante en el aprendizaje de la anatomía del cuerpo humano In our Department of Anatomy at the school of Medicine, we have introduced a plastination laboratory with the purpose of better preservation of the cadaveric material. In the impregnation of the specimens we use silicone polimer which is handle at room temperature. This way we get the best producción of plastinated material either in silicone or polyester resin. During the last tree years we have plastinated 300 pieces in silicone and 85 pieces in polyester resin. All of these material have been used to teach Anatomy and Neuroanatomy to medical students, nurses, and residents in Neurology, Radiology, Anesthesia, and Otorinolaryngology. Besides the traditional dissection, the studens have an important number of anatomical preparations for their human body anatomical learning
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