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Search Results: 1 - 10 of 581870 matches for " M.E;Casta?o "
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Fugas de calor y aprovechamiento de efluentes en la optimización de ciclos Brayton totalmente irreversibles
Herrera, C. A;Rosillo, M.E;Castao, L;
Revista mexicana de física , 2008,
Abstract: optimization of maximum power and minimum rate of entropy generation is performed on a complete and realistic brayton cycle-irreversible components, dissipative flows, power consumption on fluids movement, heat exchange through finite temperature gradients, heat leaks, and effluents unrecovered exergy-. the sets of values that produce optimum objective results are determined using fixed design parameters and variables under typical operational ranges. this work analyzes the heat leaks and effluents exergy recovery level on the optimizing set and on the system behavior. an illustrative example is presented as a study case, showing difficult-to-predict performances. this article illustrates a method which can be implemented in a computer and allows to asses existing systems and upgrade designs.
Deactivation Effects of Polyethylene Glycol (PEG) on in vitro Dry Matter Digestibility of Colophospermum mopane (Mophane) and Acacia Browse Trees in Botswana
O.R. Madibela,O. Seitshiro,M.E. Mochankana
Pakistan Journal of Nutrition , 2006,
Abstract: This trial evaluated the deactivation effects of PEG 6000 on in vitro dry matter digestibility (IVDMD) of Colophospermum mopane (Mophane) and acacia browse trees. Samples were collected from Sebele Content farm except for Mophane and were freezed dried before analysis. PEG was introduced into the digestion tubes at a rate of 160mg/g of sample in the form of a one milli liter of solution containing 80mg PEG before the addition of rumen fluid/buffer medium. It was found that plant species had an effect (P< 0.001) on IVDMD. Viscum verrucosum, mistletoe that attach on acacia trees, was found to have higher (576.6 27.7g/kg DM) while Mophane had the least IVDMD (350.5 31.0g/kg DM). IVDMD between PEG inoculated and control samples was similar (P>0.05). However, IVDMD values of PEG treated samples were numerically higher with those of Acacia nilotica approaching significance (P=0.083). Within the PEG treated samples, IVDMD was higher (P<0.05) for A. nilotica, A. tortilis and V. verrucosum and lower for Mophane samples. The low digestibility of Mophane may not be due to extractable condensed tannins (CT) because fresh Mophane leaves have been previously found to contain 27.0g/kg DM condensed tannins. Other anti-nutritional factors may be responsible for its low digestibility. Alternatively, phlobatannins which are a characteristic of heartwood of Mophane may be present in fresh leaves and may have formed an insoluble complex with PEG leading to an underestimation of IVDMD. It is concluded that PEG may not be an ideal deactivating agent to improve utilization of fodder trees by resource limited farmers and an alternative such as wood ash should be investigated.
Análisis bidimensional de la interacción fluido-estructura en válvulas mecánicas de corazón utilizando técnicas de células autómatas
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2006,
Abstract: this work shows a computational approach to simulate blood flowing through an aortic mechanical heart valve by cellular automata theory. a lagrange fluid-structure coupling is considered in this approach and changes in the fluid?s properties by the opening/closing of the leaflets during heart cycle?s time steps. velocities and shear stresses profiles in blood?s flow when it passes through the mechanical device were studied and discussed. numeric results of systolic cardiac phase were obtained. qualitative streamline maps are showed, with similar results of in vitro tests published by lim et al. (1998).
Safety, Efficacy and Acceptability of Implanon a Single Rod Implantable Contraceptive (Etonogestrel) in University of Benin Teaching Hospital
A.O Aisien, M.E Enosolease
Nigerian Journal of Clinical Practice , 2010,
Abstract: The study evaluated the safety, efficacy and acceptability of Implanon (etonogestrel) subdermal implant contraceptive amongst its acceptors. This was part of an on going prospective longitudinal study that involved 32 women out of 46 sexually active healthy informed volunteers recruited from our family planning clinic between February and March 2007. All the subjects received the single rod subdermal implant Implanon which contains 68mg etonogestrel. Data on socio-demographic characteristics, menstrual pattern, haematological indices, weight, blood pressure, side effects and user's satisfaction were collected and analysed. The subjects served as their own control. Themean age and paritywere 33.9 ± 5.2 years and 3.1 ± 1.7 respectively.Themeanweightwas 71.4 ± 12.0kg at pre-insertion. At 6 months the weight reduced to a non significant (p < 0.13) mean value of 70.0 ± 10.5kg and increased to a non significant (p < 0.88) mean value of 71.5 ± 11.6kg at 12 months. The mean systolic and diastolic blood pressures did not show statistical significant changes at 6 months follow up (p<0.17/0.64). However at 12 months there were significant but within normal reductions (p < 0.003/0.05) in the systolic and diastolic blood pressures. The side effects were menstrual abnormalities. Eighteen (56.3%), 1 (3.1%) and 13 (40.6%) reported reduced, increased and combinations of bleeding patterns respectively. No participant had normal cycle. Other experiences were headache, 4 (12.5%) and reduced libido 3 (9.4%). The mean packed and white blood cell concentrations did not show statistical significant changes at 6 and 12 months follow up. At 12 months there was statistical significant increase (p<0.04) in the mean ± SD platelet count (205312.5 ± 75694.8per ul) when compared with the pre-insertion mean value (176343.8 ±52945.3per ul).One acceptor had thrombocytopeniawithout any untoward effect. Two subjects discontinued method on account of menorrhagia and headache. The efficacy and continuation rate were 100% and 93.8% respectively. All the clients received adequate information about the method and most of themwere satisfiedwith it at followup. Implanon was an effective, safe and acceptable method of contraception amongst its acceptors. Menstrual abnormalities were the major side effects which most of the subjects found tolerable with adequate counseling. The reduced platelet concentration of the one acceptor would require follow up to ascertain the trend.
The Physical and Laying Characteristics of Golden Sex-Linked Hens under the Humid Tropical Environment
A.O. Ani,M.E. Nnamani
Pakistan Journal of Nutrition , 2011,
Abstract: A total of fifty-two Golden-sex link (brown) hens in their 65th week of lay were used in a study conducted to determine the oviposition time and interval, total egg production, clutch length and number of pause days of the birds under the humid tropical environment. The hens were also divided into four classes on the basis of their laying performances as follows: good layers, intermediate layers, poor layers and non layers and their physical conditions appraised. The birds were supplied water ad libitum and fed layers mash containing 16.5% crude protein and 9.62 MJ/kg ME for 5 weeks. Results showed that the peak of lay was between 7.30-8.30 am and declined gradually until only one egg was laid between 3.30-4.30 pm. About 66.36% and 33.64% of the eggs were laid in the morning hours and in the afternoon hours, respectively. The mean oviposition interval was 26.61 h, while the average laying intensity was 48.90%. About 98% of the clutch lengths were of 5 cycle lengths and below, with the highest frequency of occurrence being 1 cycle length. The total number of pause days over all birds was 558 days. Hens with the longest clutches and shortest number of pause days produced the greatest number of eggs. Observation made on the physical characteristics revealed that good layers had smooth and waxy comb and wattles. The vents were moist and enlarged with flexible pubic bone, soft abdomen and worn out feathers. Intermediate layers had similar features with the good layers except that eye rings, beaks and shanks were slightly bleached. Poor layers had dry combs and wattles; tight and hard abdomen and closed pubic bones. Non layers had scaly, dry and rough comb and wattles; dull eyes and rigid pubic bones which were relatively close together.
Edades K/Ar al este del cerro Nahuel Pan, Chubut. Implicancias en la correlacion del Grupo Divisadero y del Choiyoi en el área K/Ar ages from east Nahuel Pan hills, Chubut. Implicance in the Divisadero and Choiyoi Groups correlation
M.E. Vattuone,C.O. Latorre
Revista de la Asociación Geológica Argentina , 2004,
Abstract: Al este del cerro Nahuel Pan, existe una secuencia lávico piroclástica que se apoya en discordancia angular sobre una serie volcánica de composición basandesítica. Se dataron por el método K/Ar, la facies lávica dacítico-andesitica y las volcanitas basandesíticas, obteniéndose edades de 105 ± 5 Ma y de 252 ± 10 Ma respectivamente, lo que ubica a las primeras en el Cretácico, en la base del Miembro Superior del Grupo Divisadero y a las segundas en el Permotriásico, siendo equivalentes en edad al Grupo Choiyoi. Por primera vez se comprueba a esta latitud, en el faldeo oriental del área andina, la presencia de volcanitas pertenecientes a este grupo. A sequence of dacitic/andesitic flows and pyroclastic rocks, in discordance above basandesitic volcanic series at eastern Nahuel Pan hills, has been dated by K/Ar method. Samples of the flows and basandesitic volcanic rocks yield ages of 105 ± 5 Ma and 252 ± 10 Ma. These ages assign to the lavic-pyroclastic sequence a Cretaceous age (at the lower part of upper member of Divisadero Group) and to the basandesitic volcanic rocks a Permotriassic age (in line with Choiyoi Group). This is the first occurrence, of the Choiyoi Group, in the eastern slope of the Andes at this latitude.
Heterogenety of macrophages reaction during foot wounds healing in diabetic patients
Barinova M.E.,Sulayeva O.N.
Морфолог?я , 2009,
Abstract: To establish the role of macrophages in diabetic foot syndrome pathogenesis the morphometric analysis of space-time distribution of CD68+ cells was performed in skin bioptates in diabetic patients with wound healing during 24 days (1 group; n=18), non-healing wounds (more than 1,5 month – 2 group, n=12), and progressive destructive process (3 group, n=15). It was shown that changes in macrophages reaction is important factor in dysregeneration syndrome in diabetic foot pathogenesis. Hyperreaction of macrophages was accompanied with prolongation of wound healing, but anergy of macro-phageal system led to alteration of inflammatory reaction limiting and progress of destructive process.
Magnetisation of red blood cells: a Brownian Dynamics Simulation
M.E. Canoa,R. Casta?eda-Priego,A. Barrera,J.C. Estrada
Revista mexicana de física , 2012,
Abstract: A model to calculate the magnetisation of deoxyhemoglobin of human blood by means of Brownian dynamics simulations is presented. We consider a system made up of dipolar magnetic spheres, which can interact but do not overlap. Particles are exposed to external magnetic fields to compute the magnetisation curve, which exhibit a Langevin-like behaviour. The magnetic susceptibility of the erythrocytes and completely deoxygenated whole blood are Xp = 1.61 x 10-6(SI) and XWB = -4.46 x 10-6(SI), respectively, which are in good agreement to experimental data and theoretical calculations. Moreover, we also compute the paramagnetic component of the susceptibility of erythrocytes that in our simulations normal blood from beta thalassemia major samples could be differentiated.
Co-Operative Societies and the Development of Small-Scale Furniture and Tailoring Enterprises: Evidence from Delta State, Nigeria
O.D. Ogisi,O.R. Oghotomo,M.E. Tarurhor,O.E. Inoni
Pakistan Journal of Social Sciences , 2012,
Abstract: In order to examine the role of co-operative societies in small-scale enterprises development, 420 SSEs, including 231 dress-making and 189 furniture-making enterprises were randomly selected with the aid of structured questionnaires in 9 major towns in Delta State, Nigeria. The results showed that co-operative societies play a statistically significant role in the growth and development of SSEs. Although, there was a positive correlation between workforce and co-operative loan, the result was not statistically significant. Also, co-operative societies did not enhance the acquisition of entrepreneurial skills in the small-scale informal sector. Average income per year was found to increase with firm size, while labour productivity decreased with size. Firms employing 1-3 persons had the highest income per worker of 44,000.00 per annum. Personal savings, savings and rotating credit groups, and co-operative societies were the major sources of financing SSEs. Lack of access to finance and high cost of materials and equipment were found to be the principal constraints to the operations of SSEs in Delta State, Nigeria. Therefore in order to boost output in the small-scale enterprises` sector, the authors recommend the establishment of Skills Acquisition Centres for the youths, as well as the local fabrication of needed tools and equipment.
Diabetic Extremities in Kaduna
M.O. Ogirima, M.E. Asuku, A.Y. Ukwenya, N.O. Udezue
Nigerian Journal of Surgical Research , 2000,
Abstract: A 5-year retrospective review of 35 patients, suffering from diabetes mellitus with complication of the disease affecting the hands and feet is made between November 1994 and October 1999. The age range was 35-70 years with mean age of 48.5 years. M:F ratio was 2:1. The mean blood sugar at presentation was 12.9 mmol/L. There were 4 diabetic hands and 31 diabetic feet. There were 17 amputations, 12 serial wound dressing and 6 debridments. Mean duration of hospitalisation was 47.3 days. Early presentation and aggressive surgical approach to these patients is recommended (Nig J Surg Res 2000; 2:57-61) KEY WORDS: Diabetes, Extremities
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