283 research outputs found

    Giant retroperitoneal liposarcoma

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    <p>Abstract</p> <p>Background</p> <p>Liposarcoma is the most frequent histopathological variety of the retroperitoneum, surgery is the gold standard for treatment.</p> <p>Case presentation</p> <p>We present the case of a 24-year-old male who was diagnosed with a giant retroperitoneal liposarcoma. The patient received palliative treatment due to non-resectability on the basis of chemotherapy. We decided to perform surgery after no benefit was received with systemic treatment. Complete macroscopic resection of the tumor was performed, without multi-organ resection. The patient is currently alive and disease free at 14 months of evolution.</p> <p>Conclusion</p> <p>Retroperitoneal liposarcomas represent a unique situation and require a more aggressive surgical approach including multiple resections for recurrences. Based on the ability of the patient to tolerate the procedure, surgery is suggested to evaluate resectability of the tumor. We must take into consideration whether prolonged survival will be attained and tumor removal will result in palliation of symptoms.</p

    Evaluando el Bienestar de los Colombianos a través del Índice de Progreso Genuino -IPG- :1976-2003

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    El IPG es un indicador que busca medir el bienestar económico desde una perspectiva contable. Su comparación con el PIB, actualmente el indicador más usado para medir el crecimiento y el bienestar económico, arroja como resultado que el nivel de bienestar está sobrestimado y por tanto el PIB no da cuenta del verdadero nivel de aquel. La estimación del IPG y para Colombia (1976-2003), al igual que en los otros trabajos internacionales, evidencia una brecha entre el IPG y el PIB. Este resultado confirma que el PIB usado como indicador de bienestar sobrestima el bienestar de la población.Bienestar, Desarrollo Económico, Indicadores de Sostenibilidad Fuerte y Débil, IPG, PIB.

    Control of dissipation in superconducting films by magnetic stray fields

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    Hybrid superconducting/magnetic nanostructures on Si substrates have been built with identical physical dimensions but different magnetic configurations. By constructing arrays based on Co-dots with in-plane, out-of-plane, and vortex state magnetic configurations, the stray fields are systematically tuned. Dissipation in the mixed state of superconductors can be decreased (increased) by several orders of magnitude by decreasing (increasing) the stray magnetic fields. Furthermore, ordering of the stray fields over the entire array helps to suppress dissipation and enhance commensurability effects increasing the number of dissipation minima

    Algoritmo Genético aplicado al problema de programación en procesos tecnológicos de maquinado con ambiente Flow Shop

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    Debido a las limitaciones de las técnicas de optimización convencionales, en el siguiente trabajo se presenta una metaheurística basada en un algoritmo genético (AG), para resolver problemas de programación de tipo flow shop, con el objetivo de minimizar el tiempo de finalización de todos los trabajos, más conocido como makespan. Este problema, considerado de difícil solución, es típico de la optimización combinatoria y se presenta en talleres con tecnología de maquinado, donde existen máquinas-herramientas convencionales y se fabrican diferentes tipos de piezas que tienen en común una misma ruta tecnológica (orden del proceso). La solución propuesta se probó con problemas clásicos publicados por otros autores, obteniéndose resultados satisfactorios en cuanto a la calidad de las soluciones encontradas y el tiempo de cómputo empleado

    Escala Hospitalaria de Ansiedad y Depresión (HADS) en cuidadores primarios informales de pacientes con cáncer: propiedades psicométricas.

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    Introduction: Symptoms of anxiety and depression are some of the major mental health problems in caregivers affecting quality of life. Valid and reliable screening instruments such as the Hospital Anxiety and Depression Scale (HADS) has made possible the detection of possible cases of depression and anxiety. However, the psychometric properties of this instrument have not been documented in caregivers in the Mexican population. Objetives: Determine the psychometric properties of the HADS in a sample of caregivers in the Mexican population. Materials and Methods: 200 caregivers from the National Cancer Institute participated, of which 65.5% were women and 34.5% men, with a mean age of 47.4 ± 14.1 years. Participants completed concurrently the HADS and Zarit Burden Interview. Results: A factor analysis to two factors explained 42.05% of the variance with 14 items on two factors. The internal consistency of the overall scale was satisfactory (α=0.83). Cronbach’s alphas for each subscale were .78 and .82. The concurrent validity assessed by way of correlations with concurrent measures showed significant associations (Pearson r=0.41-0.64, p&lt;0.05). Conclusions: The HADS has adequate cons­truct validity, internal consistency and concu­rrent validity for use in caregivers of cancer patients from the Mexican population. The relevance of the results is that this is a popu­lation that can require mental health care in stages of care for patients with cancer.Introducción: la sintomatología ansiosa y depresiva son parte de los principales problemas de salud mental en cuidadores primarios informales afectando su calidad de vida. A través de instrumentos de tamizaje válidos y confiables como la Escala Hospitalaria de Ansiedad y Depresión (HADS) ha sido posible detectar posibles casos. Sin embargo, hasta ahora no se habían caracterizado las propiedades psicométricas en cuidadores primarios informales de pacientes con cáncer en población mexicana. Objetivo: determinar las propiedades psicométricas de la HADS en una muestra de cuidadores primarios informales. Material y Método: Participaron 200 pacientes del Instituto Nacional de Cancerología, de los cuales 65,5% eran mujeres y 34,5% hombres; la edad promedio fue de 47,4 ± 14,1 años. Los participantes contestaron además del HADS la escala de carga de Zarit. Resultados: El análisis factorial presentó dos factores con los 14 reactivos originales. La consistencia interna de la escala global mostró un índice satisfactorio (α=0,83). Los alfas de Cronbach de cada subescala tuvieron un valor de 0,82 y 0,78 que explican el 42,58% de la varianza. La validez por medio de correlación con las medidas concurrentes mostraron resul­tados significativos (r de Pearson de 0,41-0,64, p&lt;0,05). Conclusiones: La HADS en cuidadores pri­marios de pacientes con cáncer en población mexicana presentó adecuadas características psicométricas. La relevancia de los resultados obtenidos radica en que se trata de una po­blación que puede llegar a requerir atención oportuna en salud mental en diferentes etapas del cuidado de pacientes con cáncer

    Oscillations studied with the smartphone ambient light sensor

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    This paper makes use of a smartphone's ambient light sensor to analyse a system of two coupled springs undergoing either simple or damped oscillatory motion. The period, frequency and stiffness of the spring, together with the damping constant and extinction time, are extracted from light intensity curves obtained using a free Android application. The results demonstrate the instructional value of mobile phone sensors as a tool in the physics laboratory.The authors would like to thank the Institute of Education Sciences, Universitat Politecnica de Valencia (Spain) for the support of the Teaching Innovation Groups, e-MACAFI and MoMa.Sans Tresserras, JÁ.; Manjón Herrera, FJ.; Pereira, A.; Gómez-Tejedor, JA.; Monsoriu Soriano, JC. (2013). Oscillations studied with the smartphone ambient light sensor. European Journal of Physics. 34(6):1349-1354. doi:10.1088/0143-0807/34/6/1349S13491354346Monsoriu, J. A., Giménez, M. H., Riera, J., & Vidaurre, A. (2005). Measuring coupled oscillations using an automated video analysis technique based on image recognition. European Journal of Physics, 26(6), 1149-1155. doi:10.1088/0143-0807/26/6/023Shamim, S., Zia, W., & Anwar, M. S. (2010). Investigating viscous damping using a webcam. American Journal of Physics, 78(4), 433-436. doi:10.1119/1.3298370Ochoa, O. R., & Kolp, N. F. (1997). The computer mouse as a data acquisition interface: Application to harmonic oscillators. American Journal of Physics, 65(11), 1115-1118. doi:10.1119/1.18732Ng, T. W., & Ang, K. T. (2005). The optical mouse for harmonic oscillator experimentation. American Journal of Physics, 73(8), 793-795. doi:10.1119/1.1862634Tomarken, S. L., Simons, D. R., Helms, R. W., Johns, W. E., Schriver, K. E., & Webster, M. S. (2012). Motion tracking in undergraduate physics laboratories with the Wii remote. American Journal of Physics, 80(4), 351-354. doi:10.1119/1.3681904Ballester, J., & Pheatt, C. (2013). Using the Xbox Kinect sensor for positional data acquisition. American Journal of Physics, 81(1), 71-77. doi:10.1119/1.4748853Vannoni, M., & Straulino, S. (2007). Low-cost accelerometers for physics experiments. European Journal of Physics, 28(5), 781-787. doi:10.1088/0143-0807/28/5/001Skeffington, A., & Scully, K. (2012). Simultaneous Tracking of Multiple Points Using a Wiimote. The Physics Teacher, 50(8), 482-484. doi:10.1119/1.4758151Castro-Palacio, J. C., Velázquez-Abad, L., Giménez, F., & Monsoriu, J. A. (2013). A quantitative analysis of coupled oscillations using mobile accelerometer sensors. European Journal of Physics, 34(3), 737-744. doi:10.1088/0143-0807/34/3/737Carlos Castro-Palacio, J., Velázquez-Abad, L., Giménez, M. H., & Monsoriu, J. A. (2013). Using a mobile phone acceleration sensor in physics experiments on free and damped harmonic oscillations. American Journal of Physics, 81(6), 472-475. doi:10.1119/1.4793438Ouseph, P. J., Driver, K., & Conklin, J. (2001). Polarization of light by reflection and the Brewster angle. American Journal of Physics, 69(11), 1166-1168. doi:10.1119/1.1397457Berger, J. (1988). On potential energy, its force field and their measurement along an air track. European Journal of Physics, 9(1), 47-50. doi:10.1088/0143-0807/9/1/00

    General overview of sworn translators and interpreters in Colombia

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    RESUMEN: En el presente artículo se pretende mostrar una visión general de los traductores e intérpretes oficiales en Colombia. En principio, se busca conocer cuál es el estatus social, profesional y legal de ese mismo traductor e intérprete para ejercer la profesión en el país. Para ello, nos basaremos en los resultados parciales del proyecto de investigación “El estatus social y legal del traductor en Colombia” (Quiroz, Gómez, Lainez, Zuluaga y Ortiz, 2011), obtenidos por medio de una encuesta aplicada a 132 traductores colombianos (o extranjeros radicados en el país), de la cual extraemos las respuestas de 38 traductores involucrados con la traducción oficial. Igualmente, se incluyen algunos de los datos de la Comisión del Examen para Traductor e Intérprete Oficial (ETIO) de la Universidad de Antioquia y del Directorio Nacional de Traductores e Intérpretes Oficiales del Ministerio de Relaciones Exteriores. También realizamos una breve revisión y análisis de la normatividad colombiana en lo referente a la traducción oficial. Para terminar, brindamos algunas conclusiones a partir de los anteriores análisis y revisiones. Para esta discusión, se han revisado diferentes autores que han abordado este asunto desde regiones diferentes a la colombiana, pues se ha observado que el tema en cuestión nunca ha sido discutido en el ámbito académico en Colombia.ABSTRATC: This paper shows an overview of sworn translators and interpreters in Colombia. In that sense, we want to know what the social, professional and legal status of such translators and interpreters is in order to work in this country. To do so, we draw upon the partial results of the research project called “El estatus social y legal del traductor en Colombia” (“The social and legal status of the translator in Colombia”), by Quiroz, Gómez, Lainez, Zuluaga & Ortiz (2011). Information was obtained by means of a survey conducted on 132 Colombian translators (or foreign translators living in Colombia), from which responses of 38 translators involved in legal translation were extracted. Similarly, data from the Examination Board for Sworn Translators and Interpreters (ETIO), at the University of Antioquia, and from the National Directory of Sworn Translators and Interpreters (at the Ministry of Foreign Affairs) are shown. A brief review and analysis of the Colombian law regarding sworn translation is also included. For this discussion, authors from regions different to Colombia have been reviewed, since the subject under study has never been discussed from an academic perspective in Colombia. To finish, we present some conclusions from the analysis and reviews above

    Breaking the configurational anisotropy in Fe single crystal nanomagnets

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    In this work, we improve the ability to tailor the switching mechanism in nanomagnets by introducing an additional, highly controlled source of anisotropy: magnetocrystalline anisotropy. We analyze the vortex dynamics in single crystal Fe nanotriangles with different orientations of the crystalline axes. By experimental studies and simulation, we show that the angular dependence of the vortex annihilation field springs from the convolution of the crystalline and configurational anisotropies. In contrast, the remanence and the nucleation field present a much simpler behavior controlled by the existence of a single symmetry axis when shape and crystalline orientation are taken into account

    An Open-Source Proactive Security Infrastructure for Business Process Management

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    Business Process Management Systems (BPMS) have emerged in the IT arena as cornerstone in the automation and orchestration of complex services for organizations. These systems manage critical information that is crucial for the organizations. The potential cost and consequences of security threats could produce information loss for the reputation of organizations. Therefore, the early response regarding to the non-compliance of security requirement is a real necessity overall during the business process execution. Currently, an active response requires a human intervention with high know-how and expertise in both business process management and security. In this paper, we propose an initial work which presents an open-source proactive infrastructure for the automatic continuous monitoring and checking compliance of security requirements at runtime of business processes
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