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Search Results: 1 - 10 of 327176 matches for " Ramón B. "
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Contexto de Descubrimiento y Contexto de Justificación: Un Problema Filosófico en la Investigación Científica Contexto de Descubrimiento y Contexto de Justificación: Un Problema Filosófico en la Investigación Científica
Ramón Bárcenas
Acta Universitaria , 2012,
Abstract: La distinción entre “contexto de descubrimiento y contexto de justificación fue trazada por H. Reichenbach para distinguir, entre otras cosas, la manera como realizan los descubrimientos en ciencia y la manera en que se justifican y aceptan. Tradicionalmente se ha argumentado (Reichenbach, Popper, Hempel, etc.) que sólo el contexto de justificaciónes filosóficamente importante porque en él se abordan cuestiones metodológicas y epistémicas. Este artículo se limita a sugerir que estudios históricos de descubrimientos científicos muestran que en el contexto de descubrimiento también hay cuestiones metodológicas y epistémicas relevantes. Hans Reichenbach was the first philosopher to draw the distinction between “context of discovery and context of justification”, to distinguish between how scientific discoveries take place from how they are justified and accepted. Many philosophers (Reichenbach, Popper, Hempel, etc.) have argued that only justification is philosophically interesting, because in it there are methodological and epistemic issues involved. In this paper, it is argued that historical studies of scientific discoveries show that in the context of discovery there are relevant methodological and epistemic issues as well.
Una nueva aplicación de la teoría de la información
Zubillaga Berazaín,Ramón B;
Universidad, Ciencia y Tecnología , 2008,
Abstract: this paper presents the fundamental elements associated with de shannon?s definition of information measure and their application to certain type of mathematical games. it is shown the game of bulls and cows like a study case being offered an algorithm for their solution. the foundation of this algorithm is exposed being shown the results of its application.
An Empirical Analysis of Resource Productivity of Wheat in Eastern Tarai Region of Nepal
Ram B. Bhujel,Ram N. Jha,Bindeshwar Yadav
Nepal Agriculture Research Journal , 2009, DOI: 10.3126/narj.v9i0.11647
Abstract: Different types of resource conservation technology (RCT) in wheat cultivation have been recently introduced and use of seed cum fertilizer zero till drill machine is one of them which was used in eastern terai region in wheat season of 2006/2007. A survey was carried out to study the productivity of wheat and compare the production between traditional and RCT method of cultivation. Altogether 31 farmers were interviewed with semi-structured questionnaires. Model used to estimate the productivity for both the methods was significant (p < 0.01) which explained 96 and 97 per cent variation due to independent variables under study in wheat production of traditional and RCT method, respectively. Farmers used 160 kg seed/ha in traditional method while in RCT method it was 122 kg/ha. Similarly, they applied 148 and 137 kg nutrients as a total of nitrogen, phosphorus and potash in traditional and RCT method, respectively. Average production of wheat grain in traditional and RCT method was 2456 and 2714 kg/ha giving average gross margin of Rs 16750.00 and Rs 23301.00/ha, respectively. This revealed 10 per cent reduction in total costs and 29 per cent increase in return by RCT method. Nepal Agric. Res. J. Vol. 9, 2009, pp. 99-108 DOI: http://dx.doi.org/10.3126/narj.v9i0.11647
Synthesis and Electrical Analysis of Ba5GdTi3V7O30 Ceramics  [PDF]
Bana B. Mohanty, Priyadarshini S. Sahoo, Mahapatra P. K. Sahoo, Ram N. P. Choudhary
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.33027
Abstract: A polycrystalline sample of Ba5GdTi3V7O30 was prepared using a mixed oxide method at high temperature (i.e., at 950℃). The formation of single-phase compound with orthorhombic structure at room temperature was confirmed from preliminary X-ray diffraction study. Detailed studies of dielectric properties of Ba5GdTi3V7O30, investigated in a wide frequency range (102 - 106 Hz) at different temperatures (33℃ - 500℃) showed that these properties of the material are strongly dependent on frequency and temperature. The existence a dielectric anomaly suggests that the compound has a transition temperature at ~385℃. The nature of the variation of conductivity and value of activation energy in different regions, calculated from the temperature dependence of ac conductivity (dielectric data) suggest that the conduction process is of mixed type (i.e., ionic-polaronic and space charge generated from the oxygen ion vacancies). The ac conductivity spectrum obeys Jonscher’s universal power law.
Tratamiento conservador del carcinoma ductal in situ de la mama
Hepp,Rodrigo; Baeza B,M Ramón;
Revista médica de Chile , 1999, DOI: 10.4067/S0034-98871999001100008
Abstract: background: since the widespread use of mammography, the incidence of ductal carcinoma in situ of the breast has increased. until few years ago the standard treatment was mastectomy, however from the analysis of conservative treatment trials for invasive carcinoma, it was evident that ductal carcinoma in situ could also be treated conservatively. this was confirmed later by randomized trials. aim: to analyze the experience of our institution with conservative treatment of ductal carcinoma in situ of the breast. patients and methods: a search through the data base of our institution found 69 patients treated with lumpectomy and radiotherapy between the years 1976 and 1997. results: twenty three of 69 patients (33%) were diagnosed because of a palpable mass. eleven of twelve were diagnosed prior to 1990 and 12 of 57 after 1990. with a median follow-up of 48 months local control and overall survival is 97%. none of the patients underwent mastectomy. conclusions: conservative treatment of ductal carcinoma in situ of the breast is a reasonable alternative, mainly if we realize that with increasing frequency-the diagnosis is made through mammography and with non-palpable lesions. the results reported in this study are similar to those reported by other centers.
Impact on Quality Attributes for Evaluating Software Architecture Using ATAM and Design Patterns
Paul Rodrigues,B. Rajalakshmi,N. Sankar Ram
Asian Journal of Information Technology , 2012,
Abstract: Architecture evaluation for a large system can be done by using an approach called Architecture Tradeoff Analysis Method (ATAM). In large system the achievement of quality attributes such as maintainability, reusability, extensibility, scalability and Stake Holders Expects (SHE) are not full filled in ATAM approach. This study, presents a system which uses ATAM and design patterns for evaluating the software architecture to identify risk factor and check all the quality attributes have been addressed in the software. By combining the design patterns and the ATAM approach for the evaluation of the software architecture would result in better solutions.
Cómo medimos la ciencia? Segundo Workshop de la Fundación General CSIC
Sancho, Rosa,Rodríguez, Ramón B.
Revista Espa?ola de Documentación Científica , 2012,
Abstract:
Tratamiento conservador del carcinoma ductal in situ de la mama Conservative management of ductal carcinoma in situ of the breast
Rodrigo Hepp,M Ramón Baeza B
Revista médica de Chile , 1999,
Abstract: Background: Since the widespread use of mammography, the incidence of ductal carcinoma in situ of the breast has increased. Until few years ago the standard treatment was mastectomy, however from the analysis of conservative treatment trials for invasive carcinoma, it was evident that ductal carcinoma in situ could also be treated conservatively. This was confirmed later by randomized trials. Aim: to analyze the experience of our Institution with conservative treatment of ductal carcinoma in situ of the breast. Patients and methods: A search through the data base of our Institution found 69 patients treated with lumpectomy and radiotherapy between the years 1976 and 1997. Results: Twenty three of 69 patients (33%) were diagnosed because of a palpable mass. Eleven of twelve were diagnosed prior to 1990 and 12 of 57 after 1990. With a median follow-up of 48 months local control and overall survival is 97%. None of the patients underwent mastectomy. Conclusions: Conservative treatment of ductal carcinoma in situ of the breast is a reasonable alternative, mainly if we realize that with increasing frequency-the diagnosis is made through mammography and with non-palpable lesions. The results reported in this study are similar to those reported by other centers.
Fatal Outcome after Delayed Pipeline Embolization Device Migration for the Treatment of a Giant Superior Cerebellar Artery Aneurysm: Technical Note for Complication Avoidance  [PDF]
Ramón Navarro, Edison J. Cano, Leonardo B. C. Brasiliense, Guilherme Dabus, Ricardo A. Hanel
Open Journal of Modern Neurosurgery (OJMN) , 2014, DOI: 10.4236/ojmn.2014.44028
Abstract: Purpose: Flow diversion is a relatively novel technique to treat some intracranial aneurysms. With new techniques, unusual complications can occur. We described a case of Pipeline Embolization Device (PED) migration, strategy for its recognition, and a technical point to prevent its occurrence. Publication of these rare events is important to make physicians aware of potential complications. Methods: A patient with a previously coiled giant superior cerebellar aneurysm presented with brainstem compression symptoms. Imaging verified progressive aneurysm growth. A decision was made to treat the aneurysm with PED. Results: Development of new neurologic symptoms prompted a computed tomography that showed hydrocephalus. An angiogram also showed recanalization of the aneurysm secondary to upward migration/retraction of the flow diverter. A ventriculo-peritoneal shunt was implemented and planning for placement of a second flow diverter was made. Unfortunately, the patient expired while waiting for the endovacular intervention. Conclusions: PED migration may occur even after correct placement of the device. Early recognition of this complication is essential. When clinical changes occur, it is paramount that this uncommon, but potentially deadly, complication is suspected. Appropriate sizing and deployment technique are important for the long-term stability of the device.
Metapopulationapproachforlandscapelevelmanagementofwesterntarnishedplantbug,Lygushesperus,inTexas(Hemiptera,Miridae)
Parajulee Megha N.,Shrestha Ram B.
植物保护学报 , 2014,
Abstract: Insectsource-sinkdynamicsarevitaltoecologicallyintensivepestmanagement.Maintainingsinkplanthosts,or"trapcrops",anddestroyingalternatehostsorbreedingplacesadjacenttothefieldcropareeffectivepestmanagementstrategiesforsomearthropods.However,determiningwhetherahostactsasasourceorasinkischallenging,especiallywhenthepestspeciesishighlymobileandpolyphagous.Thewesterntarnishedplantbug,Lygushesperus,ishighlypolyphagous,andcanutilize>300hosts.Itspresencehasbeendocumentedin26roadsideweedhostsintheTexasHighPlains.PreviousstudiesdemonstratedthatL.hesperuspreferalfalfaovercottonandseveralalternateweedhosts.Afour-yearprojectinvolvedsurveyingandsamplingforL.hesperusintheagriculturallandscapesofseveralsub-regionsofthesouthwesternUnitedStates,includingtheTexasHighPlains.InTexas,geographicinformationofthelandscapevegetationcomplexwascompiledfroma150kmradiusintheTexasHighPlains.Inonestudy,fiftyirrigatedcottonfieldsrepresentingthecropdiversitywithinthisregionweresampledviasweep-netfor10weeks.Thiseffortalsoincludedsamplingofuptosixnon-cottoninsecthabitatswithina3kmradiusofeachfield.SeasonalaverageL.hesperusabundancedatawereregressedwith27fieldcharacteristics(variables),includinghabitat-specificlandcover,distancebetweenfocalcottonfieldsandnon-cottonhabitats,longitude,latitude,elevation,habitatheterogeneityindex,andseveralenvironmental/ecologicalvariables.Significantvariableswereselectedusingastepwiseregressionat15%probabilityrate.A10-parameterlinearmodelexplained93%ofthevariationinthedata.MajorparameterscontributingsignificantlytovariationinL.hesperusabundanceincottonwerecornandsunfloweracreages,focalcottonfielddistancesfromseveralnon-cottonhosts,andhabitatheterogeneityindex.Inaddition,fieldmarking-and-capturestudieswereconductedusingproteinmarkersandenzyme-linkedimmunosorbentassaystocharacterizeL.hesperusintercropmovementbehavior.Thefieldmarking-and-captureapproachcanbeusedtostudytheeffectsofvariouscropmanagementpracticesonL.hesperusintercropmovementandcanpotentiallybeappliedtootherpestsandcroppingsystems.
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