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Search Results: 1 - 10 of 223092 matches for " DíAZ HERNáNDEZ "
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On α-Weyl Operators  [PDF]
Slavi?a V. Djordjevi?, Fernando Hernández-Díaz
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.63011
Abstract: The purpose of this article is to present Schechter’s manner to introduce α-Wayl operators and compare this definition with another one given by Yadav and Arora. Moreover, we introduce generalized Weyl operator in the way that we keep many properties of the class of Weyl operators.
Método red como alternativa en el tratamiento del linfedema posmastectomía
Díaz Hernández,Orestes;
Revista Cubana de Cirug?-a , 2000,
Abstract: a review, analysis and study of 126 women with postmastectomy lymphedema was conducted during 7 years, the treatment consisted in recommendations for those whe had undergone mastectomy, a device to facilitate the lymphatic drainage and exercise therapy. of the total of patients, 25 died during the study and 35 gave it up. the other 66 received attention and treatment at the outpatient department. the control of the volume of their arms was carried out by volumetries with a device designed to this end. patients were classified according to the volume. 12 of them were in the first stage (mild edema), 19 in the second stage (moderate edema) and 35 in the third stage (severe edema). red method was the name used to carry out this research and treatment. according to the results, 42.8 % of the patients who were in the third stage passed to the second stage, 52.6 % that were in the second stage passed to the first stage, and 66. 6 % of the first stage had practically no edema. 50 % improved completely
Método red como alternativa en el tratamiento del linfedema posmastectomía
Orestes Díaz Hernández
Revista Cubana de Cirugía , 2000,
Abstract: Se realizó una revisión, análisis y estudio a 126 mujeres con linfedema posmastectomía, durante 7 a os. El tratamiento consistió en recomendaciones para las mastectomizadas, un equipo para facilitar el drenaje linfático y un plan de ejercicios. Del total de las pacientes, 25 fallecieron durante el estudio y 35 lo abandonaron. Las 66 pacientes restantes en su totalidad fueron atendidas y tratadas en consulta externa. El control del volumen de sus brazos se efectuaba mediante volumetrías con un equipo dise ado al efecto. De ahí que se clasificaba a la paciente de acuerdo con el volumen. De ellas, 12 se encontraban en la etapa I (edema leve), 19 en la etapa II (edema moderado) y 35 en la etapa III (edema severo). Con el nombre de método RED se lleva a cabo la investigación y el tratamiento. Según los resultados obtenidos, el 42,8 % de las pacientes de la etapa III pasó a la etapa II, el 52,6 % de la etapa II pasó a la etapa I y el 66,6 % de la etapa I quedó prácticamente sin edema alguno. De manera que el 50 % del total de los casos obtuvo una rotunda mejoría A review, analysis and study of 126 women with postmastectomy lymphedema was conducted during 7 years, the treatment consisted in recommendations for those whe had undergone mastectomy, a device to facilitate the lymphatic drainage and exercise therapy. Of the total of patients, 25 died during the study and 35 gave it up. The other 66 received attention and treatment at the outpatient department. The control of the volume of their arms was carried out by volumetries with a device designed to this end. Patients were classified according to the volume. 12 of them were in the first stage (mild edema), 19 in the second stage (moderate edema) and 35 in the third stage (severe edema). RED method was the name used to carry out this research and treatment. According to the results, 42.8 % of the patients who were in the third stage passed to the second stage, 52.6 % that were in the second stage passed to the first stage, and 66. 6 % of the first stage had practically no edema. 50 % improved completely
El marqués de Cervera y el derecho de los cubanos fieles a ser ciudadanos espa oles después del 98
Díaz Hernández, Magdalena
Anuario de Estudios Americanos , 2008,
Abstract: After the Paris Treaty in 1898, Spain refused Cubans who had supported it in the Independence War of the last Spanish colonies, their wish and right of keep on being Spanish citizens. As a consequence, they also lost their wages. That was the reason why the marques of Cervera defended them, writing a Manifiesto to the regent Queen and the Spanish Court in 1901, in which he proclaims the historical and cultural identity that Spain and Cuba had shared, like the best lure to make possible the recovery of their rights as older Spanish citizens, still living in Cuba. Tras la firma del Tratado de París de 1898, Espa a negó con fórmulas jurídicas el deseo y el derecho de los nacidos en Cuba que la habían apoyado durante la guerra de Independencia de las últimas colonias, a seguir siendo ciudadanos espa oles y, por lo tanto, a percibir sus sueldos ganados al servicio de Espa a. Por este motivo, el marqués de Cervera se erigió en defensor de éstos, escribiendo un Manifiesto que remitió a la reina regente y a las Cortes en 1901, en el que proclama la identidad histórica y cultural compartida entre Espa a y Cuba, para hacer posible la recuperación de sus derechos como antiguos ciudadanos espa oles, que siguieron residiendo en la isla de Cuba.
Local Stability of Curzon-Ahlborn Cycle with Non-Linear Heat Transfer for Maximum Power Output Regime  [PDF]
Delfino Ladino-Luna, Pedro Portillo-Díaz, Ricardo T. Páez-Hernández
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.47A2004
Abstract:

The study of local stability of thermal engines modeled as an endoreversible Curzon and Ahlborn cycle is shown. It is assumed a non-linear heat transfer for heat fluxes in the system (engine + environments). A semisum of two expressions of the efficiency found in the literature of finite time thermodynamics for the maximum power output regime is considered in order to make the analysis. Expression of variables for local stability and power output is found even graphic results for important parameters in the analysis of stability, and a phase plane portrait is shown.

Two agronomical aspects of Tagetes terniflora HBK for essential oil production  [PDF]
Miguel ángel Serrato Cruz, Francisco Díaz Cedillo, Daniel Hernández Medina, Arturo Curiel Rodríguez
Journal of Agricultural Chemistry and Environment (JACEN) , 2014, DOI: 10.4236/jacen.2014.31002
Abstract: The genus Tagetes is a possible source of essential oils for the biorational control of pests and diseases in Mexico. The aim of the present study was to assess the distance between plants (PD; 15 × 80, 30 × 80 and 60 × 80 cm) and urea fertilization (0, 60 and 120 kg·he-1 N) for biomass production and essential oil in Tagetes terniflora HBK. Oil was obtained by the aerial part hydro-distillation and its chemical composition was analyzed by gas chromatography coupled to mass spectrometry. Factors N, PD and their interaction did not change plant height or the number of branches per plant; however, PD factor modified fresh tissue (FW) and dry tissue (DW) weights and the amount of oil per plant (p ≤ 0.05) which represent a good biomass production (30 to 72.5 ton·he-1 FW, 11 to 27 ton·he-1 DW) and oil producing (168 to 383 L·he-1 ) potential in the field. Urea did not have effect on both biomass and oil response per plant but interaction of 15 x 80 DP and 120 N could favor higher biomass and oil production potential (78 ton FW, 28 ton·he-1 DW and 608 L·he-1 , respectively). Essential oil yield varied from 0.3 to 2.1% according to the management conditions. A total of 11 major compounds were identified in essential oil, the relative quantity was constant in different agronomic management factors: E- tagetone (22%), cistagetenone (20.4%), transtagetenone (20.4%), dihydrotagetone (13.4%) and cis-β-ocimene (10.3%), trans-β-ocimene (5.0%), propenyl anisole (4.3%), sphatulenole (1.1%), allyl anisole (0.7%), Z-tagetone (0.5%) and limonene (0.5%).
Unsustainable Land-Based Source Pollution in a Climate of Change: A Roadblock to the Conservation and Recovery of Elkhorn Coral Acropora palmata (Lamarck 1816)  [PDF]
Geraldine Díaz-Ortega, Edwin A. Hernández-Delgado
Natural Resources (NR) , 2014, DOI: 10.4236/nr.2014.510050
Abstract:
Chronic eutrophication and turbidity are critical detrimental factors impacting coral reef ecosystems, adversely affecting their ecological functions, services, benefits, and resilience across multiple spatial scales and over prolonged periods of time. Inadequate land use practices and lack of appropriate sewage treatment can adversely contribute to increase land-based source pollution (LBSP) impacts in coastal waters and to magnify impacts by sea surface warming trends associated to climate change. Fringing coral reefs off Vega Baja, Puerto Rico, support extensive remnant patches of Elkhorn coral Acropora palmata (Lamarck 1816), which was listed in 2006 as a threatened species under the US Endangered Species Act. Chronic impacts by LBSP have significantly affected local downstream fringing reefs. We characterized the spatial extent of a water quality stress gradient across 12 reefs along the Vega Baja coast through monthly measurements of multiple physico-chemical parameters. Most parameters, particularly PO4, , chlorophyll-a, and the concentration of optical brighteners (OABs), showed a statistically significant increase (PERMANOVA, p < 0.05) in waters close to the main pollution sources, but also in waters adjacent to Cibuco River effluents. Dissolved oxygen also declined and turbidity increased on polluted sites. PO4, , and chlorophyll-a, exceeded recommended concentrations for coral reef ecosystems by factors of 7 - 50 times, 600 - 1240 times, and 17 - 83 times, respectively, depending on the source of the effluents and the distance from sewage pollution sources. Also, water turbidity exceeded 4 - 10 times the recommended value for
Measurement of the Nucleon Nucleon Scattering Length with the ESC04 Interaction  [PDF]
Roberto Arceoro, Gerardo Jesús Escalera Santos, Orlando Díaz-Hernández
World Journal of Nuclear Science and Technology (WJNST) , 2014, DOI: 10.4236/wjnst.2014.41003
Abstract:

We have determined a value for the 1S0 neutron-neutron scattering length (ann). The scattering length result is presented for the extended-soft-core (ESC04) interaction. The value obtained in the present work is ann = -18.6249 fm. The method of solution of the radial Schr?dinger equation with nonlocal potential for nucleonnucleon pairs is described and the result is consistent with previous determinations of ann = -18.63 ± 0.10 (statistical) ± 0.44 (systematic) ± 0.30 (theoretical) fm. The nonlocal potentials are of the central, spin-spin, spin-or-bital, and tensor type. The analysis from the ESC04 interaction is done at energies 0 Tlab 350 MeV. We compare the present result with experimental S-wave phase shifts analysis and agreement is found.

On the Efficiency for Non-Endoreversible Stirling and Ericsson Cycles  [PDF]
Delfino Ladino-Luna, Pedro Portillo-Díaz, Ricardo T. Páez-Hernández
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.412B001
Abstract:

An analysis of the Stirling and Ericsson cycles from the point of view of the finite time thermodynamics is made by assuming the existence of internal irreversibilities in an engine modeled by these cycles, and the ideal gas as working substance is considered. Expressions of efficiency in both regimes maximum power output and maximum ecological function are also shown. Appropriate variables are introduced so that the objective functions, namely power output, ecological function and efficiency can be functions of the reservoirs temperatures ratio and certain “measurable” parameters as a thermal conductance, the general constant of gases and the compression ratio of the cycle. Several results from the finite time thermodynamics literature are used, so that the developed methodology leads directly to appropriate expressions of the objective functions in order to simplify the optimization process.

Una visión sucinta de la ense?anza de la medicina a lo largo de la historia: I. Desde el Antiguo Imperio Egipcio hasta el siglo XVII
Díaz Hernández,Diana Patricia;
Iatreia , 2011,
Abstract: in order to understand how medicine has been taught through the years, it is necessary to refer to historians who have approached the evolution of medicine. taking them as a starting point, it is possible to describe the attitudes of doctors in their role as professors, and the ways in which students acquired knowledge at different moments throughout centuries. this article presents a succinct vision of the advances and retrogressions in medical teaching at different historical moments. it starts with the ancient egyptian empire (3000-2500 b. c.) with its big legacy written on papyruses; continues with the enormous progress of greek medicine and the obscurity of the middle ages, and finishes with the advances until the xvii century.
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