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Study and Characterization of Expansive Cement Estudio y caracterización de cementos expansivos
Hugo Guerra Menéndez,Eduardo Peón Avés,Julio E. Lanza Rodríguez
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i3.58
Abstract: The objective of this study is to characterize commercial expansive cement for subsequent development of national formulation, with consequent economic effect and independence of the international market. On the other hand the results contribute to the development of scientific and technological potential. Expansive cement is a product that enables non-explosive demolition, rock and concrete demolition. To characterize the composition of these products, techniques used infrared spectroscopy with Fourier Transforms and Scanning Electron Microscopy. El objetivo del trabajo consiste en caracterizar un cemento expansivo comercial, para el posterior desarrollo de una formulación nacional, con el consecuente efecto económico y de independencia del mercado internacional. Por otra parte, los resultados contribuyen al desarrollo del potencial científicotecnológico. El cemento expansivo es un producto demoledor no explosivo que permite demoler rocas y hormigones. Para caracterizar la composición de estos productos, se emplean las técnicas de espectroscopia infrarroja con transformada de Fourier y microscopía electrónica de barrido. Se determina que estos cementos están compuestos por óxidos, silicatos, sulfato, ferritoaluminato y aluminato de calcio.
Efecto del azufre elemental sobre el ph y la solubilidad de algunos nutrimentos en fosfocomposts
Marcano C,ángel E; Rodríguez,Julio C; Mohsin,Mohammad;
Interciencia , 2003,
Abstract: the effect of addition of elementary sulphur (so) on the ph and solubility of some plant nutrients was studied in fosfocomposts prepared with 1kg water hyacinth (eichhornia crassipes), 800g cow manure, 200g phosphate rock (rf) and 5g sulphate acid soil, using thiobacillus sp bacteria as inoculum. 0, 5, 10, 15 and 20g of so per 2kg of composts were applied with two replicates each and a control without rf nor so. after a 6 month incubation, soluble p, mg, ca, fe, cu, mn, zn, no3-, nh4+ and so4 2-, ph, and c/n ratio were determined, as were total content of each metal and p, n, s and c. the percentages of total p and ca were higher in the phosphocomposts than in the control, while the concentrations of n, k, mg, fe, cu, mn and zn were higher than in the control (p<0,001). the lowest ph value was found in the phosphocompost with highest quantity of so. a significant correlation exists between ph and so42-; the relation increases with a decrease in ph affecting negatively the decomposition of organic matter and resulting in lower soluble no3-, p and k. a positive association was found between no3 - and ph. ca, nh4+, fe, and mn were more soluble with increasing acidity. soluble zn and mg varied significantly among the composts without relation to ph. more soluble ca with high so was an indication of a higher dissolution of the added rf. however, available p diminished in the phosphocomposts with acid ph, possibly due to its immobilization with fe and the low decomposition of the organic matter.
Microperimetría MP1 en agujero macular idiopático
Molina Martín,Julio César; Rodríguez Rodríguez,Violeta; Mendoza Santiesteban,Carlos E;
Revista Cubana de Oftalmolog?-a , 2010,
Abstract: objetive: to describe patterns of retinal sensitivity and fixation in eyes with idiopathic macular hole and in contralateral eyes at stage 0 determined by the optical coherence tomography in 35 patients suffering idiopathic macular hole, who had been diagnosed in the retinal service of "ramón pando ferrer" cuban institute of ophthalmology in 2006 and 2007. methods: each patient underwent mp1 microperimetry and optical coherence tomography in his/her eyes, using stratus 3000 at the time of diagnosis. results: the optic coherence tomography showed the stage 0 in the healthy contralateral eye of 7 patients, with a slight decrease of retinal sensitivity in the center of the fovea (mean= 12.5 db) according to the microperimetry. the occurrence of absolute scotomas within the 2 central degrees was observed from the stage ii on, whereas the relative scotomas were identified from the stage 0. the stages 0, 1a and 1b had a predominantly central stable fixation with 5 % dispersion off the 2 central degrees. a direct statistically significant correlation was found between the reduced retinal sensitivity and the decreased foveal retinal thickness at the time of diagnosis. conclusions: microperimetry was an important tool to detect functional alterations at initial stages in contralateral eyes, thus allowing a comprehensive morphological and functional assessment of these patients by means of the optical coherence tomography.
Microperimetría MP1 en agujero macular idiopático Microperimetry MP1 for idiopathic macular hole
Julio César Molina Martín,Violeta Rodríguez Rodríguez,Carlos E Mendoza Santiesteban
Revista Cubana de Oftalmolog?-a , 2010,
Abstract: OBJETIVO: Describir patrones de sensibilidad retiniana y de fijación en ojos afectados de agujero macular idiopático y ojos contralaterales con estadios 0 determinados por tomografía de coherencia óptica a 35 pacientes con agujero macular idiopático diagnosticados en consulta de retina del Instituto Cubano de Oftalmología Ramón Pando Ferrer en los a os 2006 y 2007. MéTODOS: Se le realizó a cada paciente en ambos ojos microperimetría MP1 y tomografía de coherencia óptica con el empleo del Stratus 3000 en el momento del diagnóstico. RESULTADOS: La tomografía de coherencia óptica demostró en el ojo contralateral sano la presencia de estadio 0 en 7 pacientes, que presentaron según microperimetría una ligera disminución de la sensibilidad retiniana con una media de 12,5 dB en el centro de la fóvea. Se observó la aparición de escotomas absolutos dentro de los 2 grados centrales a partir del estadio 2,y se identifica la aparición de escotomas relativos desde el estadio 0. Los estadios 0, 1a y 1b presentaron una fijación estable predominantemente central con una dispersión de un 5 % fuera de los 2 grados centrales. Se observó correlación directa estadísticamente significativa entre la disminución de la sensibilidad retiniana y la disminución del grosor retiniano a nivel foveolar en el momento del diagnóstico. CONCLUSIONES: La microperimetría constituye una herramienta importante para detectar alteraciones funcionales en estadios precoces en ojos contralaterales permitiendo a su vez una valoración integral del binomio función morfología en asociación con la tomografía de coherencia óptica. OBJETIVE: To describe patterns of retinal sensitivity and fixation in eyes with idiopathic macular hole and in contralateral eyes at stage 0 determined by the optical coherence tomography in 35 patients suffering idiopathic macular hole, who had been diagnosed in the Retinal Service of "Ramón Pando Ferrer" Cuban Institute of Ophthalmology in 2006 and 2007. METHODS: Each patient underwent MP1 microperimetry and optical coherence tomography in his/her eyes, using Stratus 3000 at the time of diagnosis. RESULTS: The optic coherence tomography showed the stage 0 in the healthy contralateral eye of 7 patients, with a slight decrease of retinal sensitivity in the center of the fovea (mean= 12.5 db) according to the microperimetry. The occurrence of absolute scotomas within the 2 central degrees was observed from the stage II on, whereas the relative scotomas were identified from the stage 0. The stages 0, 1a and 1b had a predominantly central stable fixation with 5 % dispersion off
Rendimiento del pimentón en respuesta al compost nutribora combinado con un fertilizante mineral y a diferentes distancias de siembra1
Rodríguez Reyes,Julio C; Marcano Cumana,ángel E; Monta?o,Nelson;
Agronomía Tropical , 2005,
Abstract: nutribora compost is prepared with eichhornia crassipes, cow manure and moriches soil. this compost increases sweet pepper production when the optimum dose of 80 t ha-1 is used. in this research the combination of nutribora at its optimum dose combined with a mineral fertilizer was used to determine sweet pepper yield for different treatments of planting distance. experiments were performed with the sweet pepper variety ?jupiter? in experimental plots where four fertilization treatments were applied (t1: 80 t ha-1 nutribora+ 0.4 t ha-1 12-24-12 npk in a ground soil previously sown and fertilized with the compost for one year, t2: 80 t ha-1 nutribora+ 0,4 t ha-1 12-24- 12 npk in a soil without previous sowing or fertilization, c1(control): 0.4 t ha-1 12-24-12 npk in a soil without previous sowing or fertilization, c2 (control): 80 t ha-1 nutribora in a soil without previous sowing or fertilization) and two sowing distances between plants (0.20 and 0.40 m). a statistical design of random blocks in a factorial arrangement (4x2) with 6 repetitions was applied for a total of 48 treatments. soluble and total contents of p in nutribora were low in relation to the other nutrients whereas the soluble and total k showed the highest concentration. fe y mn had the highest concentrations among total and soluble micronutrients. sweet pepper yield varied significantly between treatments (p<0.05). the highest yield was obtained with the treatment t1 and the lowest yield with treatment t4. fruit yield was significantly higher at the seeding distance of 0.20 m (p<0.05).
Caracterización de Herramientas de Ingeniería Inversa
Monroy,Martín E; Arciniegas,José L; Rodríguez,Julio C;
Información tecnológica , 2012, DOI: 10.4067/S0718-07642012000600005
Abstract: an instrument for the characterization of reverse engineering tools is proposed. a new characterization structure based on two criteria, the structural aspect and the common properties between them, is proposed. for the first one the structure corresponds to an element, a function, an aspect and a characteristic, while the second one has a factor and a property. the instrument is validated in three situations that prove his usefulness for classifying and evaluating such tools. it is concluded that the proposed instrument is a complement to the work presented by other authors, maintaining its essence and facilitating their interpretation through the new defined structure. the proposal allows the independent and joint evaluation of each of the components that form reverse engineering tools.
Candidiasis de la mucosa bucal: Revisión bibliográfica
Rodríguez Ortega,Judy; Miranda Tarragó,Josefa; Morejón Lugones,Haydée; Santana Garay,Julio C;
Revista Cubana de Estomatolog?-a , 2002,
Abstract: this paper presents an updated literature review of one of the most frequent diseases in the oral mucosa and the most common mycotic affection in this site, i.e, oral mucosal candidiasis. the general and local predisposing factors that favor the occurrence of this pathological disorder such as extended antibiotic treatments, diabetes, anemia, anti-neoplastic radiotherapy and chemotherapy, immunosuppresive drugs, aids, among others. different clinical classifications, according to several authors′ criteria and the clinical picture of the disease, are stated. finally, therapeutical options in the fields of conventional medicine and traditional and natural medicine are presented.
Candidiasis de la mucosa bucal: Revisión bibliográfica
Judy Rodríguez Ortega,Josefa Miranda Tarragó,Haydée Morejón Lugones,Julio C Santana Garay
Revista Cubana de Estomatolog?-a , 2002,
Abstract: Se presenta una revisión de la literatura actualizada de una de las enfermedades más frecuentes de la mucosa bucal y la afección micótica más común en esta localización: la candidiasis de la mucosa bucal. Se detallan los factores predisponentes generales y locales que favorecen la aparición de esta alteración patológica como son los tratamientos prolongados con antibióticos, la diabetes, la anemia, la radioterapia y quimioterapia antineoplásicas, las drogas inmunosupresoras y el SIDA, entre otros. Se exponen las diferentes clasificaciones clínicas, según el criterio de distintos autores y el cuadro clínico de la enfermedad. Finalmente se presentan alternativas terapéuticas tanto en el campo de la medicina convencional como en el de la medicina tradicional y natural. This paper presents an updated literature review of one of the most frequent diseases in the oral mucosa and the most common mycotic affection in this site, i.e, oral mucosal candidiasis. The general and local predisposing factors that favor the occurrence of this pathological disorder such as extended antibiotic treatments, diabetes, anemia, anti-neoplastic radiotherapy and chemotherapy, immunosuppresive drugs, AIDS, among others. Different clinical classifications, according to several authors′ criteria and the clinical picture of the disease, are stated. Finally, therapeutical options in the fields of conventional medicine and traditional and natural medicine are presented.
Caracterización de Herramientas de Ingeniería Inversa Characterization of Reverse Engineering Tools
Martín E Monroy,José L Arciniegas,Julio C Rodríguez
Información Tecnológica , 2012,
Abstract: Se propone un instrumento para la caracterización de herramientas de ingeniería inversa. Se define una nueva estructura de caracterización basada en dos criterios: el aspecto estructural y las propiedades comunes entre ellas. Para el primero la estructura corresponde a un elemento, una función, un aspecto y una característica, mientras que para el segundo se tiene un factor y una propiedad. El instrumento es validado bajo tres situaciones que demuestran su utilidad al momento de clasificar y evaluar este tipo de herramientas. Se concluye indicando que el instrumento propuesto es un complemento de los trabajos presentados por otros autores, manteniendo su esencia y facilitando su interpretación a través de la nueva estructura definida. La propuesta permite la valoración independiente y conjunta de cada uno de los componentes que conforman las herramientas de ingeniería inversa. An instrument for the characterization of reverse engineering tools is proposed. A new characterization structure based on two criteria, the structural aspect and the common properties between them, is proposed. For the first one the structure corresponds to an element, a function, an aspect and a characteristic, while the second one has a factor and a property. The instrument is validated in three situations that prove his usefulness for classifying and evaluating such tools. It is concluded that the proposed instrument is a complement to the work presented by other authors, maintaining its essence and facilitating their interpretation through the new defined structure. The proposal allows the independent and joint evaluation of each of the components that form reverse engineering tools.
Introduction and multiplication in vitro of garlic culture var. Morado Barranquino Introducción y multiplicación in vitrodel cultivo de ajo variedad Morado Barranquino
Karina Carhuaricra E.,Julio Olivera S.,Javier Gonzales A.,Juan Rodríguez L.
Revista Peruana de Biología , 2013,
Abstract: We determine the effect of modified culture medium using different growth regulators concentrations (auxins / cytokinins) for regeneration and propagation of in vitro garlic plants (Allium sativumL.) var. ‘Morado Barrran-quino’. In the introduction stage meristem tips were cultured in test tubes up to regeneration. It was determined that medium MSM + IBA 0.6 mg/L was most suitable for the meristem tip differentiation and development. 13 weeks old microplants obtained on introduction stage were used for multiplication, obtaining the formation of a cluster after each subcultive. The best multiplication ratio was obtained in MMA medium + IAA 2.5 mg/L + KIN 5.0 mg/L and MSM medium + 2iP 1.5 mg/L with 4.71 and 4.79 respectively. En este trabajo determinamos el efecto de medios de cultivo modificados usando diferentes concentraciones de reguladores de crecimiento (auxinas/citoquininas) para la regeneración y multiplicación in vitro del ajo (Allium sativum L.) variedad Morado Barranquino. En la fase de introducción se cultivó meristemos apicales en tubos de prueba hasta su regeneración y se determinó que el medio MSM + AIB 0,6 mg/L es el más adecuado para la diferenciación y desarrollo del meristemo. Para la multiplicación se utilizaron las microplantas (13 semanas) de la fase de introducción, obteniéndose formación de macollos en cada subcultivo; se logró mejor tasa de multiplicación en el medio MMA + AIA 2,5 mg/L + KIN 5 mg/L y el medio MSM + 2ip 1,5 mg/L con 4,71 y 4.79 respectivamente.
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