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Search Results: 1 - 10 of 557374 matches for " J.B; LEóN "
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Simulación de grietas cortas originadas por fatiga de bajo ciclaje en aceros 2Cr 1Mo
BORNIA,O; VOGT,J.B; LEóN,J. B;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: the 2.25cr 1mo steels have been studied in low cycle fatigue (lcf) to high temperatures in a previous paper. low cycle fatigue is characterized by a multiple cracking stage where conventional fracture mechanics do not reproduce kinetic short crack growth, thus providing a challenge in the area of simulation. a modification made to the kinetic equation proposed by lankford10 and a lcf adaptation on tomkins9 equation, allows us to reproduce the phenomenon to high temperatures in this type of steel before the macroscopic crack induces the failure of the material. in this work, the low cycle fatigue is simulated based on damage knowledge and the statistical record of crack populations using the computational language java (tm) 2sdk, v 1.4.2-001 as a platform. the simulator reproduces the multiple typical cracking in this type of steel under pseudo-random conditions, generating an approximation of 90 % to the experimental results.
Colgajo prefabricado occipital para cobertura de exposición ósea craneal
Rivas León,B.; Noguera Ramos,R.; Ortiz López,J.B.; Gómez Mendoza,F.F.;
Cirugía Plástica Ibero-Latinoamericana , 2010, DOI: 10.4321/S0376-78922010000100012
Abstract: cranial bone exposition after an aggressive oncological treatment is a challenge for plastic surgeon; defects can range in size and complexity, from small defects which can be covered only with skin graft or local flaps, to extensive defects that will require a free flap cover. we report a case of a 39 years-old man, who presented soft tissue defect of biparietal area following to radiotherapy and carcinoma resection. this defect was covered by prefabricated axial flap, which was harvest of forearm area and implanted under occipital hair skin and subsequently transported to the defect. the axial occipital flap healed uneventfully with a good outcome; we managed to cover the scalp defect completely without complications. as a conclusion, prefabricated occipital flap provides enough hair skin, with axial vascularity pattern to cover cranial bone exposed, when there is not a better cosmetical option.
Colgajo prefabricado occipital para cobertura de exposición ósea craneal Prefabricated occipital flap to cover craneal bone exposition
B. Rivas León,R. Noguera Ramos,J.B. Ortiz López,F.F. Gómez Mendoza
Cirugía Plástica Ibero-Latinoamericana , 2010,
Abstract: La exposición del cráneo tras un tratamiento quirúrgico oncológico agresivo es un desafió reconstructivo para el cirujano plástico; los defectos pueden variar en dimensiones y complejidad, desde peque os defectos, que pueden ser cubiertos con injertos dérmicos o colgajos locales, a defectos más extensos que requerirán de un colgajo libre para su cobertura. Presentamos el caso de un varón de 39 a os de edad que presentó un defecto biparietal posterior a radioterapia y resección por carcinoma. El defecto fue cubierto con un colgajo prefabricado axial, tomado del área antebraquial e implantado bajo la piel cabelluda occipital, para posteriormente ser llevado al sitio del defecto. El colgajo axial occipital evolucionó satisfactoriamente y logramos cubrir el defecto en su totalidad, sin complicaciones. En conclusión, el colgajo prefabricado occipital aporta suficiente piel cabelluda con patrón vascular axial para cubrir hueso craneal expuesto, cuando no hay una mejor opción cosmética. Cranial bone exposition after an aggressive oncological treatment is a challenge for plastic surgeon; defects can range in size and complexity, from small defects which can be covered only with skin graft or local flaps, to extensive defects that will require a free flap cover. We report a case of a 39 years-old man, who presented soft tissue defect of biparietal area following to radiotherapy and carcinoma resection. This defect was covered by prefabricated axial flap, which was harvest of forearm area and implanted under occipital hair skin and subsequently transported to the defect. The axial occipital flap healed uneventfully with a good outcome; we managed to cover the scalp defect completely without complications. As a conclusion, prefabricated occipital flap provides enough hair skin, with axial vascularity pattern to cover cranial bone exposed, when there is not a better cosmetical option.
New challenges in assuring vaccine quality
Dellepiane,N.; Griffiths,E.; Milstien,J.B.;
Bulletin of the World Health Organization , 2000, DOI: 10.1590/S0042-96862000000200002
Abstract: in the past, quality control of vaccines depended on use of a variety of testing methods to ensure that the products were safe and potent. these methods were developed for vaccines whose safety and efficacy were based on several years worth of data. however, as vaccine production technologies have developed, so have the testing technologies. tests are now able to detect potential hazards with a sensitivity not possible a few years ago, and an increasing array of physicochemical methods allows a much better characterization of the product. in addition to sophisticated tests, vaccine regulation entails a number of other procedures to ensure safety. these include characterization of starting materials by supplier audits, cell banking, seed lot systems, compliance with the principles of good manufacturing practices, independent release of vaccines on a lot-by-lot basis by national regulatory authorities, and enhanced pre- and post-marketing surveillance for possible adverse events following immunization. these procedures help assure vaccine efficacy and safety, and some examples are given in this article. however, some contaminants of vaccines that can be detected by newer assays raise theoretical safety concerns but their presence may be less hazardous than not giving the vaccines. thus risk-benefit decisions must be well informed and based on scientific evidence.
OCORRêNCIA DE Gynandrobrotica caviceps adumbrata Bech. (COLEOPTERA: GALERUCINAE) NA CULTURA DA SOJA EM PIRACICABA, SP
Pinheiro, J.B.;Vello, N.A.;
Scientia Agricola , 1997, DOI: 10.1590/S0103-90161997000200022
Abstract: during the croping seasons of 1990/91 and 1991/92 the presence of gynadrobrotica caviceps adumbrata bech., was observed infesting and promoting damage on soybean leaves in piracicaba, sp. this is the first report on this beetle damaging soybeans in brazil.
OCORRêNCIA DE Gynandrobrotica caviceps adumbrata Bech. (COLEOPTERA: GALERUCINAE) NA CULTURA DA SOJA EM PIRACICABA, SP
Pinheiro J.B.,Vello N.A.
Scientia Agricola , 1997,
Abstract: A presen a de Gynadrobrotica caviceps adumbrata Bech. foi observada durante as safras de 1990/91 e 1991/92, infestando e danificando folhas de soja, em Piracicaba, SP. Este é o primeiro relato sobre este coleóptero danificando soja no Brasil.
Controle de plantas daninhas em feij?o-de-corda em sistema de semeadura direta
Silva, J.B.F.;Pitombeira, J.B.;Nunes, R.P.;Pinho, J.L.N.;Cavalcante Júnior, A.T.;
Planta Daninha , 2003, DOI: 10.1590/S0100-83582003000100019
Abstract: this research was conducted to determine the effectiveness of the herbicides glyphosate (1.800 g ha-1) and paraquat (800 g ha-1), applied as desiccants before sowing and fenoxaprop-p-ethyl (0, 40, 80 and 120 g ha-1) and imazamox (0, 21, 42 and 63 g ha-1), applied in post-emergence conditions, on the weed control and the phytotoxicity to cowpea plants (vigna unguiculata cv. epace 10), under a no-till system, with furrow irrigation. a randomized complete block design with a split-split-plot design and four replications was used. the treatments with glyphosate associated with imazamox or fenoxaprop-p-ethyl was more efficient in controlling weed, showing reduced shoot weed dry biomass production, when compared to paraquat combined with the post emergence herbicides. the herbicides fenoxaprop-p-ethyl and imazamox did not cause visual phytotoxicity symptom to the cowpea plants. the best post-emergence weed control was provided by fenoxaprop-p-ethyl at the rate of 80 g ha-1, associated to glyphosate (1.800 g ha-1). the fenoxaprop-p-ethyl was effective in controlling the grass weeds, but cenchrus echinatus and digitaria horizontalis. imazamox was not effective in controlling the broadleaf weeds chamaesyce hirta and euphorbia heterophylla at the studied rates.
Fifth legged pygomelia in a cross bred cow calf
J.N. Mistry,P.B. Patel,D.N. Suthar and J.B. Patel
Veterinary World , 2010,
Abstract: [Veterinary World 2010; 3(11.000): 512-512]
Universal immunization of infants with low doses of a low-cost, plasma-derived hepatitis B vaccine in South Africa
Schoub,B.D.; Matai,U.; Singh,B.; Blackburn,N.K.; Levin,J.B.;
Bulletin of the World Health Organization , 2002, DOI: 10.1590/S0042-96862002000400005
Abstract: objetive: to evaluate the effectiveness of universal vaccination against viral hepatitis b in south africa among 18-month-old rural children. methods: children were immunized with a course of low-dose (1.5 mg), plasma-derived hepatitis b vaccine at 6, 10 and 14 weeks of age, and blood samples from the children were tested for three hepatitis b markers: hepatitis b surface antigen (hbsag), anti-hbs and anti-hbc. findings: one year after vaccination, a protective anti-hbs antibody titre of at least 10 iu/l was present in 669/769 (87.0%) of blood serum samples tested. only 3/756 children (0.4%) were hbsag positive and a fourth child was anti-hbc positive (hbsag negative). this is a marked decrease compared to the hepatitis b prevalences reported in previous studies. among rural migrant mine-workers, for example, hbsag prevalence was 9.9%, and was 10.1% among children 0-6 years of age in the eastern cape province. conclusion: the low-dose, plasma-derived hepatitis b vaccine, which is affordable to most developing countries, was very successful in controlling endemic hepatitis b infection, where the virus is predominantly spread by horizontal transmission among infants and young children.
Evaluation of Growth Characteristics and Haematological Indices of Broiler-chicks Fed Raw and Processed Bambara Groundnut Seed as a Component of Poultry Feed
O.B. Oloyede,J.B. Minari,N.O. Muhammad
International Journal of Poultry Science , 2010,
Abstract: Sixty broiler chicks (day-old) were used in a 4-week feeding experiment to assess the growth response and heamatological variables of broilers-chicks fed raw, roasted and fermented bambara groundnut as a sole source of protein. Soybean based diet served as the control. There were four (4) experimental groups, each made up of five birds in three replicates, allocated to the experimental diets. The results showed that the average final live weight, average weekly weight gain and average feed intake of birds fed fermented bambara groundnut performed better than birds fed roasted bambara groundnut but demonstrated inferiority when compared to the control. Among other organs measured the relative weight of gizzard were significantly (p<0.05) influenced by the dietary treatment. Protein quality as revealed by the haematological parameters, like Haemoglobin (Hb), Packed Cell Volume (PCV) and Red Blood Cell (RBC) levels indicated that fermented based diet fed to the birds performed better than but demonstrated inferiority when compare with the soybean based diet. However, the results showed that raw bambara groundnut based diet has a high protein quality when compared with the control diet. The use of bambara groundnut therefore in the feeding of broilers in the developing countries if properly harnessed and processed can make poultry production affordable.
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