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Search Results: 1 - 10 of 2736 matches for " Domingo Israel "
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New inversion formulas for the Kr?tzel transformation
Domingo Israel Cruz-Báez,José Rodríguez Expósito
International Journal of Mathematics and Mathematical Sciences , 2001, DOI: 10.1155/s0161171201003507
Abstract: We study in distributional sense by means of the kernel method an integral transform introduced by Krätzel. It is well known that the cited transform generalizes to the Laplace and Meijer transformation. Properties of analyticity, boundedness, and inversion theorems are established for the generalized transformation.
Valoración de opciones asiáticas con Mathematica
Cruz Báez, Domingo Israel,González Rodríguez, José Manuel
Rect@ , 2007,
Abstract: En este trabajo, utilizando el programa Mathematica, proponemos unaimplementación del valor de una opción asiática aritmética, que tiene una gran precisión computacional. Para ilustrar este hecho, realizamos una comparativa con otros métodos bien conocidos en la literatura financiera.
Simulación de los shocks estructurales y coyunturales del sector turístico ern un destino canario afectado por estancamiento y declive
Cruz Báez, Domingo Israel,González Rodríguez, José Manuel
Rect@ , 2011,
Abstract: En este artículo modelizamos la tendencia de la oferta turística en un área de la isla de Tenerife, en las Islas Canarias, cuyo crecimiento en los últimos a os ha sido afectada por la conocida como fase de declive según la terminología de Butler. Utilizamos una versión modificada del “Point Matching Method” para resolver el problema deidentificación de parámetros en las ecuaciones logísticas y hemos obtenido una nueva versión de la ecuación de Bass que nos simula la tendencia real de la citada variable. Tal metodología se corresponde con la particular evolución de los diferentes destinos de atracción turística en el Archipiélago, que han completado sus ciclos de vida a despecho de intereses exógenos, asociados con la “particular” vinculación histórica de Canarias con la conocida Expansión Atlántica de ciertos países europeos. En concreto, basándonos en estudios previos podemos afrontar nuestro estudio al modo de la Teoría de la Lucha por Recursos Escasos, tal como fuera formulada por Vito Volterra. Por lo demás, los shocks de etiología coyuntural han sido enfrentados con un tratamiento de carácter estocástico, que nos ha permitido diferenciar la estructura epistemológica inicial de aquellos efectos puntuales, que habremos de asignar a la coyuntura económica de los países emisores de visitantes a nuestras Islas
Appendiceal Colic in Children: Is It A True Surgical Entity?  [PDF]
Jason Marone, Domingo Alvear
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.38079
Abstract: Background/Purpose: For decades children have been crowding the offices of Pediatricians’ and Pediatric Surgeons with a common complaint of unexplained recurrent right lower quadrant pain. For years the topic of appendiceal colic as a cause for this recurrent abdominal pain has remain controversial. This paper highlights the experience of a single surgeon over a 5 years period using an algorithmic approach to diagnose and treat children with appendiceal colic. Methods: This is a retrospective review of 31 consecutive cases of patients experiencing recurrent unexplained right lower quadrant abdominal pain for greater than three weeks. All patients were evaluated by a single surgeon at the same institution. The patients meeting the criteria for appendiceal colic had an elective open appendectomy. The data included was compiled by a retrospective chart review from Jan 1, 2006 to December 31, 2010. Results: Twelve percent or 31 of the 238 elective appendectomies done between Jan. 2006 to Dec. 2010 where done for appendiceal colic. Sixteen were females and 15 where males ranging in age from 5-17 years of age. Average duration of symptoms was 3 weeks to 5 years. All patients had previous work up most of which where inconclusive for an organic cause. All patients presented with colic and McBurney’s point tenderness. On pathological examination the presence of a fecalith, inspissated stool or fibrosis were the most common findings. A normal appendix was observed in 14% of the cases. 100% of the patients were symptom free with three months of operation. Conclusion: Appendiceal colic proves to be true in a small subset of patients presenting with unexplained right lower quadrant abdominal pain. A high index of suspicion coupled with a thorough history and physical exam is needed to identify these patients. Classically they will present with recurrent right lower abdominal pain at McBurney’s. In our experience an elective appendectomy has been curative.
Michael E. DeBakey and Denton A. Cooley— Mike, the Master Assembler; Denton, the Courageous Fighter: A Personal Overview Unforgettable Past Remembrances in the 1960s  [PDF]
Domingo S. Liotta
Open Journal of Thoracic Surgery (OJTS) , 2012, DOI: 10.4236/ojts.2012.23010
Abstract: Domingo S. Liotta discovered Assisted Circulation at the Department of Surgery of Baylor College of Medicine in Houston in 1961 and opened up a new medical therapy: Prolonged mechanical Cardiocirculatory Assistance (LVASs) for the treatment of Refractory and Irreversible Heart Failure. The American Society of Cardiology selected Liotta’s work for the “Young Investigator Award” granted in Denver in May 1962: ”This prolonged left ventricular bypass decompresses the left ventricle, reduces left ventricular work, decreases left ventricular wall tension and increases coronary circulation” (D. Liotta, D. A. Cooley, M. E. DeBakey et al. Prolonged assisted circulation during and after cardiac or aortic surgery: prolonged partial left ventricular bypass by means of intracorporeal circulation (Am J Cardiol 1963; 12: 399-405). Indeed, there is a lucky occurrence in science; I had the good luck to start this research at a moment when initially unrelated developments were actively taking place in cardiac surgery, long before any rigor or fine statistics were produced. The first observation was to recognize an interaction between the overstretched myocardial fibers and the result of cardiac assistance causing their shortening within the normal values when the excess of blood volume retained in the heart chamber was unloaded, and the second one was that the oxygen consumption of the heart (a measurement of its energy use) decreases during Cardiac Assistance. With the collaboration of Michael E. DeBakey, Liotta started the clinical experience of Cardiocirculatory Assistance and on August 6 1966 they succeeded in the first survival of a patient in postcardiotomy cardiogenic shock. Today, after 50 years, LVASs are in force in the medical practice worldwide and contrarily to transplantation practices, they have an unlimited future; they are continuously fed back by the scientific advances of general technologies. On April 4 1969 Cooley and Liotta implanted the first clinical Total Artificial Heart (TAH) as a bridge to heart transplantation. So far, this has been the case of TAH use in which the patient could be extubated and weaned off the ventilator the following morning. This is a sort of historical document. The venerable visit of Mike DeBakey to Argentina in 1996 was evidence of his majestic peace harmonized in the memory and veracity of useful years.
Determination of One Unknown Thermal Coefficient through the One-Phase Fractional Lamé-Clapeyron-Stefan Problem  [PDF]
Domingo Alberto Tarzia
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.613191
Abstract: We obtain explicit expressions for one unknown thermal coefficient (among the conductivity, mass density, specific heat and latent heat of fusion) of a semi-infinite material through the one-phase fractional Lamé-Clapeyron-Stefan problem with an over-specified boundary condition on the fixed face \"\". The partial differential equation and one of the conditions on the free boundary include a time Caputo’s fractional derivative of order \"\". Moreover, we obtain the necessary and sufficient conditions on data in order to have a unique solution by using recent results obtained for the fractional diffusion equation exploiting the properties of the Wright and Mainardi functions, given in: 1) Roscani-Santillan Marcus, Fract. Calc. Appl. Anal., 16 (2013), 802 - 815; 2) Roscani-Tarzia, Adv. Math. Sci. Appl., 24 (2014), 237 - 249 and 3) Voller, Int. J. Heat Mass Transfer, 74 (2014), 269 - 277. This work generalizes the method developed for the determination of unknown thermal coefficients for the classical Lamé-Clapeyron-Stefan problem given in Tarzia, Adv. Appl. Math., 3 (1982), 74 - 82, which is recovered by taking the limit when the order \"\" .
A Practical Solution to the Small Sample Size Bias and Uncertainty Problems of Model Selection Criteria in Two-Input Process Multiple Response Surface Methodology Datasets  [PDF]
Domingo Pavolo, Delson Chikobvu
Open Journal of Statistics (OJS) , 2019, DOI: 10.4236/ojs.2019.91010
Abstract: Multiple response surface methodology (MRSM) most often involves the analysis of small sample size datasets which have associated inherent statistical modeling problems. Firstly, classical model selection criteria in use are very inefficient with small sample size datasets. Secondly, classical model selection criteria have an acknowledged selection uncertainty problem. Finally, there is a credibility problem associated with modeling small sample sizes of the order of most MRSM datasets. This work focuses on determination of a solution to these identified problems. The small sample model selection uncertainty problem is analysed using sixteen model selection criteria and a typical two-input MRSM dataset. Selection of candidate models, for the responses in consideration, is done based on response surface conformity to expectation to deliberately avoid selection of models using the problematic classical model selection criteria. A set of permutations of combinations of response models with conforming response surfaces is determined. Each combination is optimised and results are obtained using overlaying of data matrices. The permutation of results is then averaged to obtain credible results. Thus, a transparent multiple model approach is used to obtain the solution which gives some credibility to the small sample size results of the typical MRSM dataset. The conclusion is that, for a two-input process MRSM problem, conformity of response surfaces can be effectively used to select candidate models and thus the use of the problematic model selection criteria is avoidable.
Macrocyclops albidus (Copepoda: Cyclopidae): una nueva alternativa para el control de larvas de mosquitos en Cuba
Suárez Delgado,Silvia; Rodríguez Rodríguez,Jinnay; Menéndez Díaz,Zulema; Montada Dorta,Domingo; García Avila,Israel; MarquettiFernández,María del Carmen;
Revista Cubana de Medicina Tropical , 2005,
Abstract: the cyclopoid copepod macrocyclops albidus was evaluated as a biological control agent of aedes aegypti and culex quinquefasciatus larvae, culicides that frequently live in containers of domestic use in urban zones. the experiments were made under controlled laboratory conditions. plastic containers with 5 l of dechlorinated water and 3 g of dry leaves were used. 2 densities of copepods and 3 combinations of larvae densities were added. 5 replicas were made. the count of the suviving larvae and the recovered copepods was made 6 days after the beginning of the experiment. it was observed a marked reduction of the larval population of mosquitoes in all the treatments with copepods. it was stressed their preference for the ae. aegypti larvae that was not affected by the presence of cx. quinquefasciatus larvae. the copepods showed a high survival in all the assayed variants. it was over 100 % when they were added in the lowest density.
Moisture Migration and Bulk Nutrients Interaction in a Drying Food Systems: A Review  [PDF]
Israel Sunmola Afolabi
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.58080
Abstract:

Drying is a technique that involves removal of moisture using heat energy. This heat affects the protein components in foods especially the thiosulphide groups, which causes hydrophobic bond break that has been attributed greatly to denaturation during drying. Safe moisture content (SMC) is the extent to which moisture can be withdrawn from food crops during drying that such crops can be considered safe for storage with minimal loss of nutritional qualities. Several reported minimum moisture contents, and bulk nutrients’ levels of crops were collected for the purpose of this review, and scattered plot graph was employed to determine the levels of bond interaction between moisture content and each bulk nutrients in the various dried food categories. The moisture contents in grains, root and tuber crops, fruits and vegetables, and cash crops formed a SMC threshold boundary within the 6% - 14%; 0% - 10%; 0% - 22%; and 0% - 30% respectively. Crude fibre and most especially the ash content played the most crucial role by providing the strongest bond interaction with migrating moisture during drying of all the food crops’ categories, and are of utmost important in the determination of SMC.

Professional Demand of Objectivity and Its Effect on Media Objectivity in Conflict Management in Journalism  [PDF]
Israel Udomisor, Anthony Paul Udoh
Advances in Journalism and Communication (AJC) , 2015, DOI: 10.4236/ajc.2015.31001
Abstract: The mass media or the press occupies a central position in the society. It is basically involved in the information, education, and entertainment as well as cultural transmission. The enormity of the functions of the press makes it imperative for a guiding principles or code of ethics which includes objectivity. However, current practices in the media especially as pertains to conflict management negate this ethical standard or code, hence the imperative of this study which seeks to investigate how the media can engage in conflict management without breaching this cherished and longstanding principle. This study is based on the framing analysis theory and the agenda setting theory of communication. Using the documentary or historical survey method in the collection of data, it is observed that the media are naturally attracted to conflict and some journalists or media organisation use their position to fight individual or group battle while others blow some seemingly innocuous issues out of proportion thereby generating conflict in the society. It is also noted that the media sometimes play down, frame or slant some facts to avoid escalation of conflict. All these negate the principle of objectivity. It is therefore recommended that the media should at all times value, uphold and apply objectivity in all its reportage, by separating facts from comments, for effective conflict management. The media should also embrace proactive conflict management approach, peace journalism, investigative journalism and agenda setting for peaceful resolution of conflicts.
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