bluuebunny/crossref_metadata_2025 huggingface dataset:
The Political Economy Of American Indian Allotment Revisited
Authors: Gregg Mathew T. , Cooper D. Mitchell
Published: February 2016

This paper criticizes McChesney's (1990) hypothesis that the decisions to initially and subsequently terminate American Indian allotment were based on the Bureau of Indian Affairs’ (BIA) interest to inflate their budget.  By adopting a richer database on the BIA appropriations from 1877-1945 and correcting for model specification problems, I find no empirical evidence supporting any of McChesney's hypotheses concerning the bureaucratic demand for regulatory change.  In fact, other large budgetary items, such as New Deal relief funding, Court of Claims judgments, and educational spending, crowded out BIA land management appropriations over these years.  Interestingly, a cursory overview of this period illustrates how the BIA fought for less, rather than more, administrative control over Indian affairs.    
Energy Economics: A Benefit-Cost Consideration Of Corn-Based Ethanol And Bio-Fuel
Authors: Doss D. Adrian , Troxel Stacy , Sumrall Bill
Published: February 2016

This paper discusses salient characteristics of corn-based ethanol and bio-fuels.  The discussions contained within this paper consider the historical and contemporary attributes of such corn-based ethanol and bio-fuels characteristics, global and domestic considerations, the production and generation of such fuels, the usefulness and applications of such fuels, various growth potentials and barriers, future potentials, and financial costs and benefits.  Based on these discussions, conclusions are presented and various recommendations are offered.
Experiential Learning Theory: From Theory To Practice
Authors: McCarthy Mary
Published: February 2016

This paper examines Kolb’s (1984) Experiential Learning Theory and Learning Style Inventory, presents a summary of some research examining accounting students’ learning style preferences, and provides examples of activities to incorporate into the instructional environment that encourages learning through experience.
Capital Markets And Economic Development: A Framework For Newly Liberalized Economies
Authors: Ouandlous Arav
Published: February 2016

One of the main objectives of this study is to show the necessity of capital markets and the sine qua non condition for their effective and efficient use for economic development.  I relied heavily on a large body of scientific literature and empirical evidence to support my assertions.  The implementation of capital markets requires time and more importantly cooperation between the government authorities and the private sector.  I believe that the efficient functioning of capital markets presupposes a favorable economic and political environment and a corresponding appropriate institutional support for this environment.  The confidence in the future and the confidence of the investors in this future are the sine qua non for the success of these capital markets.  Thus, the role of the government in providing this confidence is pivotal to the implementation of efficient capital markets and to the propelling of economic development.
A Study Of Gender Differences With Respect To Internet Socialization Of Adolescents
Authors: Swinarski Matthew E. , Parente Diane H. , Noce Kathleen
Published: February 2016

This study investigates the differences between adolescent males and females in the perceived amount of knowledge regarding internet usage provided by various socialization agents (i.e. parents, school, media, and peers).  Further, it examines whether there is a significant difference in the amount of knowledge regarding internet usage provided by various socialization agents within gender.  The study takes a social learning perspective to examine the gender differences.
A Simple Analysis Of New York State Tort Reform
Authors: Lichtenstein Larry , Reiber Ronald R.
Published: February 2016

In New York State, there has been a rapid increase in personal injury litigation over the recent past.  We show empirically that the tort reform that occurred in the 1980s may be, in part, responsible for this phenomenon by increasing the effective structured award that the plaintiff receives.  However, despite this generous compensation scheme, some cohorts of plaintiffs may still not receive economic justice. 
The Impact Of Extrinsic Motivational Dissatisfiers On Employee Level Of Job Satisfaction And Commitment Resulting In The Intent To Turnover
Authors: Pepe Michael
Published: February 2016

This study examines the relationship between Extrinsic motivational factors such as Perceived Supervisor Support (PSS) and job satisfaction, organizational commitment and the intent to leave. Using a sample of 46 managers and clerical support staff at a Supermarket retailer, the findings indicate that as employees’ perception of Supervisor Support increases, their organizational commitment (affective and continuance) and job satisfaction significantly increase. Also, as employee organizational commitment (affective and continuance) and job satisfaction increase, their intent to leave significantly decreases.
A Research In Relating Entrepreneurship, Marketing Capability, Innovative Capability And Sustained Competitive Advantage
Authors: Lee Jia-Sheng , Hsieh Chia-Jung
Published: February 2016

The purpose of this research is to investigate the relationships of entrepreneurship, marketing capability, innovative capability, and sustained competitive advantage; hopefully to propose some new points of views in managing enterprises. We investigate the top 1000 Taiwan manufacturers in 2009 issued by Commonwealth magazine of Taiwan in this research. In total, 116 effective samples are collected. We use SEM linear structure equation model, and LISREL 8.7 editions of software for data analyses, and verify our hypotheses. The empirical results show: 1.entrepreneurship directly influence marketing capability, innovative capability and sustained competitive advantage respectively; and indirectly influence sustained competitive advantage through marketing capability and innovative capability respectively; 2.although marketing capability does not influence sustained competitive advantage directly, but influence sustained competitive advantages indirectly through innovative capability; in the other way, innovative capability influence sustained competitive advantage directly. Therefore, we suggest that an enterprise needs to develop its organizational culture of entrepreneurship and the two kinds of capabilities, marketing and innovation, hopefully to enhance its sustained competitive advantage.
Min And Max Triangular Extreme Interval Values And Statistics
Authors: Jance Marsha , Thomopoulos Nick
Published: February 2016

This paper concerns the triangular distribution and shows how to find the min and max extreme interval values and related statistics (mean, standard deviation, mode, and median) for a range of observation sizes, n.  The extreme interval value, denoted as <span style="position: relative; line-height: 115%; font-family: "Calibri","sans-serif"; font-size: 11pt; top: 4pt; mso-fareast-font-family: Calibri; mso-ansi-language: EN-US; mso-bidi-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-bidi; mso-bidi-language: AR-SA; mso-fareast-language: EN-US; mso-text-raise: -4.0pt;">, represents a bound where the probability of any value less than <span style="position: relative; line-height: 115%; font-family: "Calibri","sans-serif"; font-size: 11pt; top: 4pt; mso-fareast-font-family: Calibri; mso-ansi-language: EN-US; mso-bidi-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-latin; mso-ascii-theme-font: minor-latin; mso-hansi-theme-font: minor-latin; mso-bidi-theme-font: minor-bidi; mso-bidi-language: AR-SA; mso-fareast-language: EN-US; mso-text-raise: -4.0pt;">is α.  Tables and an application are provided.
Servant Leadership: A Phenomenological Study Of Practices, Experiences, Organizational Effectiveness, And Barriers
Authors: Savage-Austin Amy R. , Honeycutt Andrew
Published: February 2016

The subject of leadership is complex, and one of the main issues facing organizational leaders today is how to motivate employees to actively participate in the efforts that lead to accomplishing organizational goals. This study gathered lived experiences of 15 organizational leaders who practice the servant leadership philosophy, and explored how business leaders link their servant leadership practices to their organization’s effectiveness. The qualitative responses obtained during this study indicated that the perceived organizational barriers that prevent the servant leadership practices are the organization’s culture, the fear of change, and the lack of knowledge regarding the servant leadership philosophy. This study also gained insight into the impact that these organizational barriers have on one’s ability to practice servant leadership.
Customer Focused Advertising Through Server Based Broadcast
Authors: DeBray Blake E. , Kamal Mustafa
Published: February 2016

Advertising has become a common part of our culture and is an area that is undergoing continuous changes.  The same can be said for the means of distributing advertisements.  Television and radio are no longer the only means of media distribution.  New technologies have allowed consumers to view their favorite programs (and the advertisements that come with them) from a wide variety of devices and methods.  Content can be viewed from home, out in public and on the road in ways that were previously unimaginable.  For several decades, the most common way to reach viewers was through the television.  Although this method of distribution will not change any time soon, other new ways to reach audiences have sprung from modern technologies.  What does this mean for the businesses who have ruled the advertising industry for all of these years?
Getting Proactive: Cultural And Procedural Drivers Of Managerial Motivation To Act
Authors: Rusetski Alexander
Published: February 2016

The importance of managers’ proactive behaviors in the workplace is well documented. While previous studies have focused on dispositional drivers of proactive behaviors, this paper investigates situational - cultural and procedural - factors that affect managers’ motivation to proactively engage in behaviors aimed at improving performance of their firms. Results of a survey of brand managers suggest that consumer orientation and adhocracy culture tend to increase proactive behaviors, while technology strategic orientation decreases managers’ motivation to act.  Interestingly, the cultural characteristics of a firm are significantly more effective in motivating managers than evaluation and compensation procedures.
The Impact Of Economic And Social Orientation On Trust Within Teams
Authors: Dass Mayukh , Kumar Piyush
Published: February 2016

In this paper, we develop a model to examine the impact of an individual’s economic and social orientation and the congruence of such orientations across the trustor-trusted dyad on the level of dyadic trust within a team.  The model explicitly accounts for higher order dependencies in trust among team members and the potential reciprocity in trust between members of a dyad.  The results from our model estimation provide evidence that congruence in economic and social orientation is an important antecedent of dyadic trust.  We also find that dyadic trust is characterized by higher order dependencies among team members; however, we do not find that trust is characterized by reciprocity.  We also find a wide variation in the polarization in teams based on the levels of trust among their members.  Taken together, these findings highlight the need to account for higher order dependencies in the study of trust in teams.
Twos Company, Threes A Cloud: Challenges To Implementing Service Models
Authors: Ghormley Yvette
Published: February 2016

Although three models are currently being used in cloud computing (Software as a Service, Platform as a Service, and infrastructure as a service, there remain many challenges before most business accept cloud computing as a reality. Virtualization in cloud computing has many advantages but carries a penalty because of state configurations, kernel drivers, and user interface environments. In addition, many non-standard architectures exist to power cloud models that are often incompatible. Another issue is adequately provisioning the resources required for a multi-tier cloud-based application in such a way that on-demand elasticity is present at vastly different scales yet is carried out efficiently. For networks that have large geographical footprints another problem arises from bottlenecks between elements supporting virtual machines and their control. While many solutions have been proposed to alleviate these problems, some of which are already commercial, much remains to be done to see whether these solutions will be practicable at scale up and address business concerns.
Consumer Adoption Challenges To The Smart Grid
Authors: Gupta Anu
Published: February 2016

The smart grid represents the next significant evolution of the power infrastructure with many enhancements and challenges. This paper provides a qualitative review of the key consumer adoption challenges of the smart grid. This literature review takes disparate pieces of work and identifies strategic research focal areas. Through existing research and media documents, it identifies the primary consumer adoption challenges as privacy, Radio Frequency (RF) safety, and power rate increases. It also provides a review of each adoption challenge. The review is applied to the Canadian perspective drawing from smart grid experiences across North America. The review demonstrates that each of the challenge areas has a negative impact on the adoption and support of the smart grid.This paper recommends further in-depth research be conducted in the following areas: testing each of the consumer adoption challengesprivacy, RF Safety, and rate increasesseparately with quantitative measures; testing the willingness to accept a power infrastructure with the security and stability level of a bank; and testing the impact that proactively educating the public would have on the smart grid adoption.
Front-Line Employees’ Recognition And Empowerment Effect On Retail Bank Customers’ Perceived Value
Authors: Skudiene Vida , Everhart Dallas D. , Slepikaite Karolina , Reardon James
Published: February 2016

Understanding how front-line bank employee recognition and empowerment impacts customer value is an important issue for the banking industry. Retail banking customers perceive little difference in services as competition has created more choices. When banks develop new products, they are easily duplicated by the competition. Banks can gain a competitive advantage by understanding the interrelationships that impact customers perceived value. The major providers of customer perceived value in retail banking are front-line employees. This research aims to better understand these interrelationships and examine how front-line retail bank employee recognition and empowerment relate to retail bank customer perceived value. Customers perceived value is defined in terms of relationship, social, emotional, service and empowerment. Survey findings illustrate that retail banks should concentrate more on employee recognition and empowerment to impact customers perceived value. According to the findings of the survey, front-line employee recognition and empowerment has a positive impact on customers perceived value.
A Discussion Of Goods-Dominant Logic And Service Dominant Logic: A Synthesis And Application For Service Marketers
Authors: Gannage Jr. George J.
Published: February 2016

Service-Dominant (S-D) Logic is a mindset for a unified understanding of the purpose and nature of organizations, markets, and society. The fundamental principle of S-D logic is that organizations, markets, and society are primarily concerned with exchange of servicethe applications of competencies (knowledge and skills) for the benefit of a consumer(s). Thus,service is exchanged for service; all firms that transact daily in numerous micro-industries are service based. Consequently, marketing thought and practice should be grounded in service logic, principles, and theories.S-D logic embraces concepts of value-in-use andco-creation of value rather than thevalue-in-exchange andembedded-value concepts of Goods-Dominant (G-D Logic. This study challenges several of the fundamental premises (FP) asserted by Vargo and Lusch by analyzing how customers are brought into the marketing relationship and play a central role in the development and success of tangible goods and as active participants in defining the need for service. A series of personal interviews with upper to middle management, along with an MS excel House of Quality (HoQ) assessment instrument was used to gather data for this study. The QFD, HoQ assessment instrument is used to expose correlations between the 10 premises advanced by V and L and the functional quality characteristics most sought by service practitioners today. This research study analyzed the existence of conceptual SD-Logic and its recognition among four different service businesses along with their various marketing strategies.
Evaluación de la corrosión-erosión en aceros austeníticos y martensíticos. (Evaluation for Corrosion-Erosion in Austenitic and Martensitic Steels.)
Authors: Aperador Chaparro W. , Bautista Ruiz J. , Vargas Uscátegui A
Published: February 2016

ResumenEn este trabajo se presentan los resultados de evaluar la resistencia a la corrosión dinámica, la erosión y la corrosión-erosión, a ángulos de impacto de 30◦ y 90◦, con respecto a la superficie de la muestra, en aceros ASTM 240 (A240) o AISI 304 y ASTM 576 (A576) o AISI 1045. La caracterización electroquímica sedesarrolló mediante la técnica de curvas de polarización de Tafel, y la caracterización microestructural por microscopía electrónica de barrido. Se encontró una disminución notable en la velocidad de corrosión para los aceros A240 en comparación con el A576, bajo condiciones de corrosión dinámica y corrosiónerosión.  El desgaste mecánico indicó que la condición de ángulo normal representa mayores pérdidas de espesor del material, en comparación con el ángulo rasante, para las dos clases de aceros. Al comparar los diferentes materiales de estudio, en condición de ángulo normal y rasante, se observó claramente que el acero A576 presenta los mayores valores de pérdida de volumen, en igualdad de condiciones (igual tiempo de exposición), en comparación con el acero A240. La aplicación de la técnica de microscopía electrónica de barrido permitió evaluar los mecanismos de daño dominantes y corroboraron los resultados obtenidos por las mediciones electroquímicas. AbstractThis paper presents the results of evaluating the dynamic corrosion resistance, the erosion and corrosionerosion, to impact angles of 30 and 90, with respect to the sample surface in steel ASTM 240 (A240) or AISI 304 and steel ASTM 576 (A576) or AISI 1045. The electrochemical characterization was developed by the Tafel polarization curves and the micro-structural characterization by the scanning electron microscopy. There was a marked decrease in the corrosion rate for steel A 240 compared with A576, under the erosion corrosion and corrosion dynamics conditions. Mechanical wear indicated that the normal angle condition represents higher losses in the material thickness, compared to the grazing angle for the two classes of steels. When comparing the dierent study materials in normal condition and grazing angle, it is clearly observed that the steel ASTM A576 has the highest loss values volume, in equal exposure time, in comparison with the A240 steel. The scanning electron microscopy application techniques allowed to assess the dominant damage mechanisms and corroborated the results obtained by the electrochemical measurements.
Evaluación de la degradación de superficies de fluorapatita mediante técnicas electroquímicas. (Degradation Assessment of Fluorapatite Surfaces using Electrochemical Techniques)
Authors: Reyes Jaimes L. J. , González Romero H. A. , Sandoval Amadora A. , Peña Ballesteros D. Y. , Estupiñán Durán H. A.
Published: February 2016

ResumenSe evaluó el efecto del pH de fluido corporal simulado en la formación de apatitas y en la degradación de superficies de la aleación Ti6Al4V recubiertas con Fosfato de Calcio mediante la técnica de lectrodeposición catódica. Como variables de estudio se tomaron el pH del fluido corporal simulado y el tiempo de inmersión de los recubrimientos. Mediante microscopia electrónica de barrido, espectroscopia de energía dispersiva, difracción de rayos X y absorción atómica se pudo corroborar la formación de apatitas, y la degradación de los recubrimientos se evaluó mediante Espectroscopia de impedancia electroquímica y curvas de polarización potenciodinámicas. Los resultados obtenidos muestran que los recubrimientos tenían altas concentraciones de Fluorapatita (Ca5(PO4)3F) y que su formación se ve favorecida a medida que el pH del fluido corporal simulado y el tiempo de inmersión aumenta. Por otra parte, se obtuvo que las muestras evaluadas a pH de 7,2 son menos estables termodinámicamente, sin embargo, las evaluadas a 7,6 presentan una superficie más activa, por lo que se obtiene una mayor velocidad de degradación. AbstractThe pH eect of a Simulated Body Fluid in the apatite formation and the degradation of the Ti6Al4V alloy surfaces, coated by calcium phosphate obtained through cathodic electrodeposition was evaluated. The simulated body fluid pH and the coating immersion time were taken as variables. The formation of apatite was corroborated by Scanning Electron Microscopy, Energy Dispersive Spectroscopy, X Ray Diraction and Atomic Absorption Techniques. The coating degradation was assessed by the Electrochemical Impedance Spectroscopy and the Potential Dynamic Polarization Curves. The results have shown that the coatings had high concentrations of fluorapatite (Ca5(PO4)3F) and its formation was favored as the simulated body fluid pH and the immersion time increases. Moreover, it was found that the coatings samples evaluated at pH 7.2 were less thermodynamically steady, however, the evaluated coating at pH 7.6 exhibited a more active surface, so that a higher rate of degradation is obtained.
Caracterización funcional de la almendra de las semillas de mango [Mangifera indica L.]. (Functional Characterization of Mango Seeds Kernel [Mangifera indica L.].)
Authors: Chaparro Acuña S. P. , Lara Sandoval A. E. , Sandoval Amador A. , Sosa Suarique S. J. , Martínez Zambrano J. J. , Gil González J. H.
Published: February 2016

ResumenLa almendra de la semilla de mango fue analizada para establecer su composición química y sus propiedades funcionales, con el fin de establecer la viabilidad de su uso como ingrediente en la industria de alimentos. Se realizó el análisis proximal de la almendra de la semilla de mango (Mangifera indica L.), obtenida como desecho agroindustrial, y la caracterización funcional de la harina desengrasada. La almendra presentó la siguiente composición: proteína cruda, 6,39%, humedad, 44,8%, grasa cruda, 10,70%, cenizas, 2,4%, y fibra, 2,38%. En la harina desengrasada, la capacidad de absorción de agua y de aceite fue de 3,0 y 2,0 mL/g, respectivamente. La actividad emulsificante aumentó al incrementarse el pH, alcanzando un máximo a pH=10. Al aumentar la concentración de la dispersión harina/agua (20% p-v) se observó el incremento de la capacidad gelificante. El tipo de proteínas que contiene la harina son globulinas (40,16%), proteínas insolubles (23,84%), glutelinas (15,81%), albúminas (12,11%) y, en menor concentración, prolaminas (8,08%). La extracción de aislados proteicos se obtuvo con bajos rendimientos (menor del 2%), por lo tanto, no se cuantificaron sus propiedades funcionales. AbstractMango seeds were analyzed to establish their chemical composition and functional properties in order toinvestigate the possibility of their use as an ingredient in the food industry. The average composition of kernel was determined to be: 6,39% of crude protein, 44,8% of moisture, 10,70% of oil, 2,4% of ash and 2,38% of crude fiber. Water and oil absorption capacity of meal was 3,0 mL/g and 2,0 mL/g, respectively. Emulsifying activity increased with increasing pH peaking at 10. Increasing the concentration of the flour/water (20% bw) dispersion improved gelling ability. The type of proteins are globulins (40,16%), insoluble proteins (23,84%), glutelin (15,81%), albumin (12,11%) and less prolamin concentration (8,08%). The extraction of protein isolates, was obtained at low yields (less than 2%), therefore, their functional properties were not quantified.
Carta Editorial
Authors: Gómez Cuaspud Prof. Dr. Sc. Jairo Alberto
Published: February 2016

Carta Editorial
Cola de un fluido modulada por un proceso de Markov con finitos estados
Authors: Arunachalam V. , Dharmaraja S.
Published: February 2016

La distribución del estado estacionario del contenido de una cola de fluido en un dispositivo modulado por
dos procesos independientes de nacimiento y muerte, se encuentra utilizando técnicas diferenciales para
resolver un sistema de ecuaciones. Las tasas de flujo de entrada se determinan mediante un proceso de
nacimiento y muerte, con espacio de estados finitos y la tasa de flujo de salida del recipiente se determina por el estado actual de otro proceso independiente de nacimiento y muerte con cuatro estados, que evolucionan en el fondo. Mediante la combinación de estos dos procesos de nacimiento y muerte se obtiene una cadena de Markov de tiempo continuo. Se observa que la distribución del estado estacionario del contenido de una cola de fluido se modula por una cadena de Markov en tiempo continuo. Finalmente, se presentan resultados numéricos para ilustrar la viabilidad del modelo propuesto.
Métodos estadísticos de riesgos competitivos: un estudio comparativo
Authors: Yáñez Canal S. , Lopera Gómez C. M. , Jaramillo Elorza M. C.
Published: February 2016

El tiempo de falla de un sistema con dos modos de falla puede ser modelado como un sistema en serie o
un modelo de riesgos competitivos. Cada unidad tiene un tiempo potencial de falla asociado a cada modo
de falla, el tiempo de falla observado es el mínimo de esos tiempos potenciales individuales. Si se ignoran
los riesgos competitivos y sólo hay un evento de interés, se utiliza la función de riesgo de causa específico,
la cual asume que los otros riesgos no existen. En estas condiciones trabajan los métodos clásicos de
Kaplan-Meier, la prueba log-rank y el modelo de riesgos proporcionales de Cox, por lo tanto sus resultados
responden preguntas relacionadas al efecto “puro” asociado a una sola causa. Ahora bien, si se consideran
de manera simultánea los riesgos competitivos, se utiliza la función de subriesgo o la función de riesgo de la subdistribución. Así, se han desarrollado metodologías alternativas que dan cuenta de esta situación. Por
ejemplo, la función de incidencia acumulada (FIA), las pruebas de Gray y de Pepe & Mori, y finalmente
la regresión de riesgos competitivos como contraparte del modelo de Cox. En este trabajo, estos últimos
métodos, son presentados e interpretados. Ellos son ilustrados mediante un caso real en Interconexión
Eléctrica S.A. E.S.P. (ISA).
Análisis del rendimiento del potencial mBJLDA considerando efectos de presion
Authors: Camargo Martínez J. A. , Correa Higuera L. J. , Baquero R.
Published: February 2016

En este artículo se presenta un análisis detallado del rendimiento del potencial modificado de Becke-Johnson (mBJLDA), considerando los efectos de la presión hidrostática. La brecha de energía prohibida fue
calculada para un grupo de semiconductores usando el potencial mBJLDA. Estos resultados se compararon
con los obtenidos por otros métodos de cálculo, para lograr un juicio objetivo de este potencial. Se encontró que la aproximación GW (GWA) brinda las predicciones más precisas. El potencial mBJLDA es, en general, un poco menos exacto. Los funcionales híbridos son menos precisos. En el 88% de los semiconductores tenidos en cuentra, el error fue menor del 10%. Tanto GWA como el potencial mBJLDA reproducen la brecha de energía prohibida de 15 de los 27 semiconductores considerados, con un error del 5% o menor.

Enseguida, se analizó el comportamiento del potencial mBJLDA para describir los efectos de la presión
hidrostática. Se calcularon los coeficientes de presión y el potencial de deformación volumetrica para un
grupo de semiconductores utilizando este potencial. Los valores calculados se correlacionan muy bien con
otros informes teóricos. Con estos resultados se concluyó que el potencial mBJLDA opera razonablemente
bien en la descripción de los efectos de la presión hidrostática sobre la brecha de energía prohibida de los
semiconductores.
Plantas útiles del corregimiento Santa Inés y la vereda San Felipe (San Marcos, Sucre, Colombia),
Authors: Barrios Paternina E. , Mercado Gómez J.
Published: February 2016

Este estudio determinó el uso etnobotánico de las plantas, en relación con la edad y el sexo de los informantes, en dos comunidades del municipio de San Marcos (Sucre). Un total de 285 encuestas se realizaron, y se encontraron 85 especies útiles, que fueron organizadas dentro varias categorías, de las cuales las más representativas fueron: medicinal, comestible y ornamental. Rutaceae fue determinada como la familia con mayor número de especies útiles. Además, se pudo establecer que las mujeres son más afines a especies medicinales y ornamentales, mientras que los hombres, a comestibles. Rutaceae y Solanaceae, entre otras, son de uso comestible, y Myrtaceae y Lamiaceae, entre otras, son medicinales. Igualmente, se determinó que las raíces y los frutos son comestibles; las hojas, medicinales, y las plantas vivas, ornamentales. Origanum vulgare presentó el mayor IVU (Índice de Valor de Uso), debido a sus múltiples utilidades en varias categorías y según el UST (Uso Significativo Trámil). Ninguna planta empleada como medicinal fue citada frecuentemente en varios usos, por el contrario, solo tienen un uso específico.
Cálculo de la estructura electrónica de la superred (GaN)4(RuN)4
Authors: Espitia R. M. J. , Casiano Jiménez G. , Ortega López C.
Published: February 2016

Se investigaron las propiedades estructurales y electrónicas de la superred de periodo corto (GaN)4(RuN)4
calculadas en estructura wurtzita con orientación (0001), usando un cálculo de primeros principios dentro de
la DFT (Density Functional Teory). Se utilizó el método FP-LAPW (Full Potential Linearized Augmented
Plane Waves), como fue implementado en el código WIEN2k. Los efectos correlación e intercambio
fueron tratados usando la GGA (Generalized Gradient Approximation) de Perdew, Burke y Ernzerhof. Para
determinar los mejores parámetros en estructura wurtzita se optimizó la energía total como una función:
i) el volumen de la celda unitaria, ii) la razón c/a y iii) la coordenada z de los átomos de Ga y Ru. Se
hace un estudio detallado de la densidad de estados y estructura de bandas; se encontró que la superred
(GaN)4(RuN)4 presenta un comportamiento metálico. En el nivel de Fermi, la contribución a la densidad de
estados se debe principalmente a los orbitales atómicos d de Ru.
Síntesis y caracterización del sistema La0,8Sr0,2MnO3
Authors: Cruz Pacheco A. F. , Gómez Cuaspud J. A.
Published: February 2016

Este trabajo reporta la síntesis y la caracterización de un óxido tipo La0,8Sr0,2MnO3, usando una ruta de
síntesis de química húmeda, con la cual fue obtenido un material cerámico con propiedades fisicoquímicas y características estructurales de gran importancia para aplicación como componente electródico para uso en pilas de combustible de óxido sólido (SOFC). El material sintetizado se caracterizó por difracción de rayos X (XRD), obteniéndose un material con estructura tipo perovskita. Los resultados derivados de microscopia electrónica de transmisión de alta resolución (HRTEM) confirmaron la obtención de sólidos de morfología regular orientados de forma preferente en el plano (1 1 2), con distancias interplanares d calculadas de 0,25 nm con base en los resultados de HRTEM y XRD. La composición del material La0,8Sr0,2MnO3 fue determinada mediante microanálisis de rayos X por energía dispersiva (EDX), indicando una buena concordancia entre la composición propuesta y obtenida. Los valores de área superficial y volumen de poro medidos por el método BET permiten indicar que el material preserva sus características superficiales y texturales en función del método de síntesis utilizado.
Estabilización oxidativa del aceite de Sacha inchi (Plukenetia volubilis Linneo) con suspensiones de mortiño (Vaccinium meridionale SW)
Authors: Zapata Acosta K. , Piedrahita A. M. , Alzate A. F. , Cortés F. B. , Rojano B. A.
Published: February 2016

El aceite de Sacha inchi (Plukenetia volubilis Linneo)ha sido reconocido a nivel mundial por su alto
contenido de omegas; sin embargo, la presencia en él de ácidos grasos poliinsaturados hace que sea
sustancialmente propenso al deterioro oxidativo. En este trabajo se evaluó el efecto de suspensiones de
mortiño (Vaccinium meridionale SW) a 1000, 1500 y 2000 mg L−1 sobre la estabilidad oxidativa del aceite de Sacha inchi (Plukenetia volubilis Linneo)sometido a condiciones de oxidación aceleradas durante 12 horas (60 °Cy flujo de aire a 1700 mL.min−1). La magnitud del deterioro oxidativo fue monitoreada midiendo la formación de compuestos polares (CP), trienos conjugados (TC) y valor peróxido (VP) del aceite, en presencia y ausencia de la suspensión. Los resultados revelaron que el aditivo es eficaz en la estabilización del aceite de Sacha inchi (Plukenetia volubilis Linneo), de tal manera que concentraciones de 2000 mg L−1 reducen el contenido de compuestos polares, trienos conjugados y valor peróxido en un 92,3%, 71,4% y 47,8%, respectivamente. De otro lado, se determinó el contenido de fenoles totales, flavonoides, taninos condensados y antocianinas de la suspensión de mortiño (Vaccinium meridionale SW), de modo que se caracterizara el poder antioxidante; los resultados demuestran que la suspensión es una fuente excepcional de antioxidantes naturales que serían los responsables de prevenir la oxidación del aceite de Sacha inchi (Plukenetia volubilis Linneo).
Algunas relaciones entre álgebras N-Koszul, Artin-Schelter regular y Calabi-Yau con extensiones PBW torcidas
Authors: Suárez Héctor , Lezama O. , Reyes A.
Published: February 2016

Some authors have studied relations between Artin-Schelter regular algebras, N-Koszul algebras and Calabi- Yau algebras (resp. skew Calabi-Yau) of dimension d. In this paper we want to show through examples and counterexamples some relations between these classes of algebras with skew PBW extensions. In addition, we also exhibit some examples of the preservation of these properties by Ore extensions.
Propiedades volumétricas de soluciones acuosas de etanol y [Emim]+ [CF3SO3]− a partir de datos de índice de refracción
Authors: Madrid Úsuga D. , Urango Baquero M. P. , Portacio Lamadrid A.
Published: February 2016

Las densidades de las soluciones acuosas de etanol y de 1-Etil-3-Metilimidazolio Trifluorometanosulfonato
[Emim]+[CF3SO3]− fueron estimadas a partir de datos de índice de refracción a diferentes temperaturas;
los resultados obtenidos se encuentran dentro del intervalo de confianza establecido para las densidades
reportadas en la literatura para estos sistemas y de las calculadas empleando la ecuación de Gladstone-Dale (GD). Las densidades estimadas en esta investigación se utilizaron para los cálculos de los volúmenes molares y volúmenes molares parciales a dilución infinita. Los datos de volumen molar parcial se correlacionaron con la concentración de soluto y la temperatura, para estudiar cualitativamente las interacciones presentes en las soluciones acuosas tratadas. Se encontró que el sistema [Emim]+[CF3SO3]− + agua tiene un carácter disruptor sobre las moléculas de agua, mientras que en el sistema etanol + agua predomina el efecto hidrofílico sobre el hidrofóbico.
Los Entornos Virtuales de Enseñanza y Aprendizaje en la Universidad Nacional de La Plata. Una aproximación a los usos y opiniones de los estudiantes
Authors: Nóbile Cecilia Inés , Luna Alvaro Enrique
Published: February 2016

En los últimos años el desarrollo de las Tecnologías de la Información y Comunicación han ofrecido un abanico de herramientas con un potencial muy importante para contribuir a la labor docente. Más allá de las posibilidades de realizar cursos y carreras de grado y posgrado a distancia, la educación tradicional, típicamente presencial, también se ha visto modificada por ello.Por tanto, este trabajo tiene como objetivo general lograr una primera aproximación a la percepción de los estudiantes de la UNLP sobre el uso de los Entornos Virtuales de Enseñanza y Aprendizaje, como contribución a la calidad educativa.El marco general del presente trabajo es el proyecto “La calidad de la educación superior. Un estudio sobre la percepción de los Estudiantes”, el cual se encuentra acreditado en el Programa de Incentivos impulsado por el Ministerio de Educación, Ciencia y Tecnología de la Nación.La metodología utilizada se corresponde con la aplicada en el mencionado proyecto siendo la información presentada aquí una parte de la relevada. Dicha metodología es de carácter descriptiva, tratándose de una investigación no experimental con un diseño transversal en la cual las fuentes de información básica utilizadas son de tipo primaria, recabada por medio de cuestionarios auto-administrados.La información aquí presentada permite plantear la necesidad de desarrollar mayores investigaciones que aborden aspectos tales como opiniones y acciones de docentes y estudiantes para dar cuenta cuál es la contribución de las Tecnologías de la Información y Comunicación a la calidad educativa y cuál es el rol que cumplen los docentes en este proceso.
Desarrollo del entorno personal de aprendizaje para tutoría e investigación en niveles educativos superiores
Authors: Dzib Goodin Alma , Castevich John , Hogan Dolores Luna , Sanders Linda , Slovec Kathleen , Yelizarov Daniel
Published: February 2016

El concepto de entorno personal se refiere a los sistemas que facilitan a los aprendices a tomar control de manera autónoma de sus aprendizajes. Esto incluye apoyos para determinar sus propias metas, comprensión de contenidos y de los procesos implicados en el proceso de aprendizaje. Usualmente el mayor impulso se ofrece en torno a las nuevas tecnologías, ya que se supone que el alumno es capaz de interactuar de manera efectiva con los lenguajes y entornos tecnológicos, pues más jóvenes las generaciones, más conocimiento tienen del uso y manejo de la información en medios digitales.Partir de este supuesto, y suponer que el alumno es capaz por sí mismo de encontrar su propio camino, lleva a mucha frustración, especialmente cuando se considera como factor clave las diferencias culturales.El presente trabajo busca reconocer que existen diferencias culturales en el manejo de herramientas que se consideran usuales como las redes sociales para desarrollar propuestas académicas que permitan apoyar el aprendizaje de los estudiantes y se encuentra que existen factores que pueden potencialmente beneficiar o entorpecer el desarrollo académico de los estudiantes si estas no son consideradas en los programas educativos.Reconocer dichas diferencias es clave para trabajar en programas de apoyo a los estudiantes, pues una vez que éstos reconocen sus potencialidades y son capaces de generar las estrategias adecuadas a los requerimientos de las nuevas tecnologías, serán más eficientes en su aprendizaje.
Mobility of Ethomeen C12 and Carbon Dioxide (CO2) Foam at High Temperature/High Salinity and in Carbonate Cores
Authors: Cui Leyu , Ma Kun , Puerto Maura , Abdala Ahmed A. , Tanakov Ivan , Lu Lucas J. , Chen Yunshen , Elhag Amro , Johnston Keith P. , Biswal Sibani L. , Hirasaki George
Published: February 2016

The low viscosity and density of carbon dioxide (CO2) usually result in the poor sweep efficiency in CO2-flooding processes, especially in heterogeneous formations. Foam is a promising method to control the mobility and thus reduce the CO2 bypass because of the gravity override and heterogeneity of formations. A switchable surfactant, Ethomeen C12, has been reported as an effective CO2-foaming agent in a sandpack with low adsorption on pure-carbonate minerals. Here, the low mobility of Ethomeen C12/CO2 foam at high temperature (120 °C), high pressure (3,400 psi), and high salinity [22 wt% of total dissolved solids (TDS)] was demonstrated in Silurian dolomite cores and in a wide range of foam qualities. The influence of various parameters, including aqueous solubility, thermal and chemical stability, flow rate, foam quality, salinity, temperature, and minimum-pressure gradient (MPG), on CO2 foam was discussed. A local-equilibrium foam model, the dry-out foam model, was used to fit the experimental data for reservoir simulation.
Catheter Related Escherichia hermannii Sepsis in a Haemodialysis Patient
Authors: Rank Cecilie Utke , Lommer Kristensen Peter , Schrøder Hansen Dennis , Brandi Lisbet
Published: February 2016

Escherichia hermanniiis an extremely rare etiological agent of invasive infection, and thus, the bacterium was initially considered non-pathogenic. However, in five previously reported case reportsE. hermanniihas been implicated as the sole pathogen. Our case report describes blood stream infection withE.hermanniiin a haemodialysis patient with persisting symptoms, high fever and inflammatory markers despite appropriate antibiotic treatment until replacement of the dialysis catheter. We suspect biofilm formation to be a crucial pathogenic feature forE. hermanniiin the maintenance of an infection, which stresses the necessity of antibiotic treatment along with catheter replacement in bloodstream- and catheter-related infection withE. hermannii.
Effects of biochar application on morphological traits in maize and soybean
Authors: Seremesic Srdjan , Zivanov Milorad , Milosev Dragisa , Vasin Jovica , Ciric Vladimir , Vasiljevic Marjana , Vujic Natasa
Published: February 2016

This paper analyses the effects of the biochar application morphologi?cal
traits in maize and soybean under semi-controlled conditions. During the
study, the in?creasing doses of biochar (0%, 0.5%, 1, 3, and 5%) were
incorporated in three soil types: Alluvium, Humogley and Chernozem to
determine plant height and shoot weight. The ex?periment was set up as fully
randomized design with three repetitions. The plants were grown in pots of 5
l with controlled watering and N fertilization. The research results have
shown that there are differences in terms of biochar effects on soils. The
greatest effect on plant height and shoot weight was obtained when the
biochar was applied to Humogley soil and lower effects were found on the
Alluvium soil. The increase in aboveground mass of maize and soybeans was
significantly conditioned by adding different doses of biochar. Based on
these results, it can be concluded that adding biochar can significantly
affect the growth of plants. This is a consequence of the changes it causes
in soil, which requires further tests to complement the current findings.
Structural properties of maize hybrids established by infrared spectra
Authors: Radenovic Cedomir , Maksimov Georgij , Tyutyaev Evgenij , Syusin Ilja , Shutova Vitalina , Secanski Mile , Srdic Jelena , Videnovic Zivorad , Popovic Aleksandar
Published: February 2016

This paper discusses the application of the infrared (IR) spectroscopy method
for determination of structural properties of maize hybrid grains. The IR
spectrum of maize grain has been registered in the following hybrids: ZP 341,
ZP 434 and ZP 505. The existence of spectral bands varying in both number and
intensity, as well as their shape, frequency and kinetics have been
determined. They have been determined by valence oscillations and deformation
oscillations of the following organic compounds: alkanes, alkenes, alkynes,
amides, alcohols, ethers, carboxylic acids, esters and aldehydes and ketones,
characteristic for biogenic compounds such as carbohydrates, proteins and
lipids. In this way, possible changes in the grain structure of observed
maize hybrids could be detected.
Degradation of linuron in soil by two fungal strains
Authors: Danilovic Gordana , Curcic Natasa , Pucarevic Mira , Jovanovic Ljubinko , Vágvölgyi Csaba , Kredics László , Pankovic Dejana
Published: February 2016

Two fungal strains were applied to soil polluted with herbicide in order to
determine their degradation potential. Three experimental setups were used.
In the first setup, the soil in pots was contaminated by linuron in final
concentration of 1 ppm. Suspensions of Phanerocheate chrysosporium and
Trichoderma asperellum were applied sepa?rately or in combination. Tomato
plantlets were transplanted and chlorophyll content in their leaves was
determined at two time points during plant growth. In the second setup in
pots, the final concentration of linuron was lower, 0.45 ppm. In the third
setup 0.1 ppm of linuron was applied in the field plot. Plantlets of lettuce
were transplanted and chlorophyll content was measured as indicator of plant
stress. The content of linuron in soil was determined by HPLC. The applied
fungal strains significantly reduced toxic effect of 0.45 ppm linuron on
plants, which was not the case for 1 ppm linuron. Both fungi, applied
separately or in combination, were effective in decreasing the linuron
content in the soil. However, in field conditions the combination of both
fungi was the most effective.
Screening of Azotobacter isolates for PGP properties and antifungal activity
Authors: Bjelic Dragana , Marinkovic Jelena , Tintor Branislava , Tancic Sonja , Nastasic Aleksandra , Mrkovacki Nastasija
Published: February 2016

?mong 50 bacterial isolates obtained from maize rhizospher?, 13 isolates
belonged to the genus Azotobacter. Isolates were biochemically characterized
and estimated for pH and halo tolerance ability and antibiotic resistance.
According to characterization, the six representative isolates were selected
and further screened in vitro for plant growth promoting properties:
production of indole-3-acetic acid (IAA), siderophores, hydrogen cyanide
(HCN), exopolysaccharides, phosphate solubilization and antifungal activity
(vs. Helminthosporium sp., Macrophomina sp., Fusarium sp.). Beside HCN
production, PGP properties were detected for all isolates except Azt7. All
isolates produced IAA in the medium without L-tryptophan and the amount of
produced IAA increased with concentration of precursor in medium. The highest
amount of IAA was produced by isolates Azt4 (37.69 and 45.86 ?g ml-1) and
Azt5 (29.44 and 50.38 ?g ml-1) in the medium with addition of L-tryptophan
(2.5 and 5 mM). The isolates showed the highest antifungal activity against
Helminthosporium sp. and the smallest antagonistic effect on Macrophomina sp.
Radial Growth Inhibition (RGI) obtained by the confrontation of isolates with
tested phytopathogenic fungi, ranged from 10 to 48%.
On the new and rare Lepidoptera in Serbian fauna
Authors: Jaksic Predrag
Published: February 2016

New distributional records are given for eight Lepidoptera species in Serbia.
Ethmia lugubris (Staudinger, 1879) (fam. Ethmiidae) is reported in Serbia for
the first time. Larval mines of Stigmella centifoliella (Zeller, 1848) (fam.
Nepticulidae), photos of Hypercalia citrinalis (Scopoli, 1763) (fam.
Amphisbatidae) and Cryphia amasina (Draudt, 1931) (fam. Noctuidae), as well
as male genitalia of Leptidea reali Reissinger (1988) - Leptidea juvernica
Williams, 1946 complex (fam. Pieridae) and Cryphia amasina are presented. UTM
10 x 10 km distribution map for three species is provided.