bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of MgSO4 Solution on the Physicochemical and Mechanical Properties of OPC-Metakaolin and OPC-Metakaolin-Limestone Blends
Authors: E. E. Hekal  , M. Abd-El-Khalek  , M. S. Amin  , F. A. Selim
Published: July 2016

This study aims to investigate the effect of MgSO4 solution on the durability of the pastes made of ordinary Portland cement (OPC) blended with 10, 20 and 30 wt.% metakaolin (MK) and the pastes made by partial substitution of metakaolin in the mix containing 30% metakaolin by 5 and 10 wt.% limestone (LS). All pastes were prepared using the suitable amount of water for standard consistency. The pastes cured in tab water for 28 days then divided into two sets; the first one continued for hydration in tab water up to two years. The second set was immersed in 5% MgSO4 solution for the same period of hydration. Compressive strength, chemically combined water content and free lime content of the two sets of the hardened cement pastes were determined and compared to each other. Also, mass change of the set samples immersed in sulphate solution was investigated. In addition, phase composition and microstructure of some selected samples in the two solutions were examined by using XRD and SEM techniques respectively. It was found that the paste made of (70% OPC + 20% MK + 10% LS) represent the most durable against sulphate attack.
Investigating Barriers in HIV-Testing Oncology Patients: The IBITOP Study, Phase I
Authors: Merz Laurent , Zimmermann Stefan , Peters Solange , Cavassini Matthias , Darling Katharine E.A.
Published: July 2016

Background.

Although the prevalence of non-AIDS-defining cancers (non-ADCs) among people living with HIV is rising, we observed HIV testing rates below 5% at our oncology center, against a regional HIV prevalence of 0.2%–0.4%. We performed the Investigating Barriers in HIV-Testing Oncology Patients (IBITOP) study among oncology physicians and patients.

Methods.

Between July 1 and October 31, 2013, patients of unknown HIV status newly diagnosed with solid-organ non-ADCs referred to Lausanne University Hospital Oncology Service, Switzerland, were offered free HIV testing as part of their oncology work-up. The primary endpoints were (a) physician willingness to offer and patient acceptance of HIV testing and (b) physicians’ reasons for not offering testing.

Results.

Of 239 patients of unknown HIV status with a new non-ADC diagnosis, 43 (18%) were offered HIV testing, of whom 4 declined (acceptance rate: 39 of 43; 91%). Except for 21 patients tested prior to oncology consultation, 175 patients (of 239; 73%) were not offered testing. Testing rate declined among patients who were >70 years old (12% versus 30%; p = .04); no non-European patients were tested. Physicians gave reasons for not testing in 16% of cases, the main reason being patient follow-up elsewhere (10 patients; 5.7%). HIV testing during the IBITOP study increased the HIV testing rate to 18%.

Conclusion.

Although the IBITOP study increased HIV testing rates, most patients were not tested. Testing was low or nonexistent among individuals at risk of late HIV presentation (older patients and migrants). Barriers to testing appear to be physician-led, because patient acceptance of testing offered was very high (91%). In November 2013, the Swiss HIV testing recommendations were updated to propose testing in cancer patients. Phase II of the IBITOP study is examining the effect of these recommendations on HIV testing rates and focusing on physician-led testing barriers.
Dark Energy in Robert Frost’s Poems
Authors: Su Yujie
Published: July 2016

Robert Frost is regarded as one of the most distinguished American poets in the twentieth century. His work usually realistically describes the rural life in New England in the early twentieth century and conveys complex social and philosophical themes. But his personal life was plagued with grief and loss, which is also reflected in his poems, and the dark energy distinguishes Robert Frost’s poems, frequently conveyed in the use of lexical words like dark and its derivatives or synonyms, woods, snow, night, and so on. The present study starts with the survey of the lexical representations of dark energy used in Robert Frost’s poems, which are collected in The Oxford Book of American Poetry, and the other poems listed on the website which are not collected in the book but written by Robert Frost[1], aiming to gain more understanding of the great poet’s contemplation involving human and nature.
Development of a Questionnaire for the Assessment of Writing Problems
Authors: Danaee Amineh
Published: July 2016

Due to the importance of publishing and its advantages for professors at the present time, this article intends to develop a questionnaire based on Bachman’s model (1990) to seek Iranian professors' attitude toward major problematic areas of writing Iranian scholars encounter trying to create a scientific paper so as to diminish rejection upon submission. The findings of the questionnaire demonstrated that regarding organizational competence, rhetorical organization, vocabulary, morphology and syntax were taken much more essential in this regard. On the subject of pragmatic competence, ideational functions and sensitivity to naturalness received greater importance. Concerning lower level skills of writing, professors declared the importance of spelling and punctuation in writing. General publishing problems asked from the professors exhibited the importance of all the items, but with greater emphasis on quality in writing. As a final point, professors' comments were described.
A Comparative Study of the Effects of Recasts and Scaffolded Feedback on the Grammatical Accuracy of Elementary EFL Learners
Authors: Saeb Fateme , Mahabadi Dariush Nejad Ansari , Khazaei Akbar
Published: July 2016

The study reported in this paper aimed at investigating the differential efficacy of scaffolded feedback and recasts as two types of corrective feedback (CF) in improving elementary EFL learners’ grammatical accuracy. Forty-five beginner EFL students formed a control group (n= 16) and two experimental groups (scaffolding= 16, recast= 13). The use of the third person singular ‘s’ morpheme for verbs was selected as the target structure to be treated through the provision of the corrective feedback. The scaffolded feedback was operationalized within a sociocultural framework as a collaborative process during which learners were provided with assistance adjusted to their individual needs. Recasts, on the other hand, were operationalized as reformulations of learners’ erroneous utterances without the error. The results indicated a significant improvement in accuracy for the two experimental groups from pretest to posttest. Also, the difference between the scaffolding and recast groups in the posttest was significant. Overall, these findings confirmed the beneficial effects of CF and in particular scaffolded feedback on learners’ grammatical accuracy.
The Use of CAX Systems as a Tool for Modeling Construction Element in the Aviation Industry
Authors:   Technical University of Košice, Slovakia, Kužma Dalibor , Korba Peter , Hovanec Michal , Dulina Ľuboslav
Published: July 2016

The article deals with the adjustment of the wing selected part of the plane Viper SD-4 from slovak producer with using environment of software Siemens NX9. The adjustment is carried out after consultation with the test pilots of this plane and tries to take into account the observations made during the test flights. The first part of the article is focused on the current construction of the wings and its parts. The second part describes how digitalize the real wing by using reverse engineering. The last section describes adjustment of the design and its 3D model in a virtual environment. The model is created in the environment Modeling and Aero Sheet Metal in software Siemens NX. When modelling was also used part of the drawing documentation from the manufacturer. This article deals with the wing treatment on the theoretical base.
The Cycle of Abrasives in the Process of Cutting of Materials Abrasive Waterjet Technology within the Logistics Companies
Authors:   Department of Mechanical Engineering, Institute of Technology and Business České Budějovice, Czech Republic, Karková Monika , Kmec Ján , Kučerka Daniel
Published: July 2016

Today, stalked company is defined as an industrial. Technologies are developed and refined, and this leads to innovation in the field of environmental protection and logistics. Environmental protection as a concept is quite lengthy and includes several areas. This article deals with the life cycle of materials technology at cutting water jet from the award of the contract to the finished product.
The Application of the Organizational Culture Assessment Instrument (OCAI) to Logistics Enterprises
Authors:   Department of Tourism and Marketing, Faculty of Corporate Strategy Institute of Technology and Business České Budějovice, Czech Republic, Ližbetinová Lenka , Lorincová Silvia , Caha Zdenek
Published: July 2016

Today´s world is reflected in words such as globalization, economic crisis, market economy and competitiveness. All these influence business entities. An enterprise that does not keep pace with current trends, innovates, seek improvements in quality or assess the effectiveness of its activities, is at risk of stagnating. Similar trends also prevail in logistics enterprises in Slovakia. The aim of this study was to analyse organizational culture in logistics enterprises because it is one of the key factors affecting the quality of the products and the overall competitiveness of an enterprise. Utilizing the Organizational Culture Assessment Instrument (OCAI) we diagnosed the dominant trend within Slovak logistics enterprises. On the whole these enterprises have a hierarchical organizational culture. However, employees are of the opinion that there should be a more familial work environment, typical of a clan organizational culture. Whilst enterprises continue to underestimate this factor, they will miss an important tool to achieve better success rates in a tough competitive environment.
A Hybrid Diagnostic System for a Small Turbojet Engine
Authors:   Faculty of Aeronautics, Technical University of Košice, Slovakia, Andoga Rudolf , Adamčík jr. František , Hrabovský Ján , Vaispacher Tomáš
Published: July 2016

A diagnostic system is one of the key components securing the safety of operation of a turbojet engine. There are many different engineering approaches how to design engine diagnostic systems applied in real-world conditions. We propose a novel approach for a diagnostic system design to be applied on the object of a small turbojet engine using thermal diagnostics combined with a more traditional model based approach. The combination of these two approaches together with application of methods from the area of computational intelligence create a hybrid diagnostic system, which can be integrated with a control system of the engine. The article also deals with experimental validation of the designed diagnostic system on the object of a small turbojet engine iSTC-21v in laboratory conditions.
Foreign Direct Investment and Transport Serviceability – a Prerequisite for the Development and Stability of National and Regional Economies
Authors:   Department of Management, Institute of Technology and Business in České Budějovice, Straková Jarmila , Kucharčíková Alžbeta , Pártlová Petra , Váchal Jan
Published: July 2016

This article focuses on the development and impact of foreign direct investment (hereinafter referred to as “FDI“) in the V4 countries and in particular Slovakia, with a primary focus on the automotive and electronics industries. A detailed analysis is carried out in the Žilina Region, where the positive impact of FDI on the economic growth of the region and its stability is documented through regression analysis. In the following part, the influence of both foreign and domestic investment on transport serviceability and transport infrastructure development is analysed on the basis of the example of the Region of South Bohemia.
Ficción, sexualidad y raza en The Dumb Virgin y The Unfortunate Bride de Aphra Behn
Authors: SHIH Yao-Hsi J.
Published: July 2016

Trabajo que pretende estudiar la representación física de los personajes Belvideera, María y Celesia en las obras de Aphra Behn "The Dumb Virgin: Or the Force of Imagination" y "The Unfortunate Bride: Or the Blind Lady a Beauty". Tiene como objetivo interpretar la importancia de los defectos físicos de las jóvenes heroínas basándose en Characteristics of Men, Manners, Opinions, Times de Shaftesbury. El artículo relata en primer lugar la ficción de las historias feminocéntricas de Behn en relación con los tratados de moral de Shaftesbury, que dividen y malinterpretan la imaginación maternal como algo defectuoso y monstruoso. Posteriormente, argumenta que la autora da mayor relevancia al tema de la misoginia, dotando a sus jóvenes protagonistas femeninas con una doble deformación, en la que la maternidad imperfecta da a luz a una segunda generación de hijos imperfectos, mientras la feminidad deformada en los mismos sucesos de defectos se entremezcla con las implicaciones exóticas y raciales de la degeneración y el mestizaje. Las historias de amor de la autora, amparadas en el sexo y la raza, son trágicas, mientras que las de Shaftesbury sobre sexualidad y raza emanan del vicio de la monstruosidad y están diseñadas para la perpetración de actos monstruosos. Mediante la dotación de características monstruosas femeninas y raciales, como se explica en el siguiente trabajo, Behn crea una historia para inventar un narrador como resolución dialéctica a la construcción binaria de oposiciones de Shaftesbury en su instrucción moral. Aunque la narradora de Behn cede su poder autoría y se presenta como una mera relatadora de historias, su pluma femenina ejerce su autoridad haciendo justicia a sus personajes y sus fantasías literarias, reconociendo así a la escritora femenina como una artista, una creadora de ficción. Desde el punto de vista de la trascendencia dialéctica, la narradora de las ficciones románticas no solo evita la jerarquía socio-sexual y la dicotomía entre sexualidad y raza, sino que también señala de forma tácita un avance en el dominio discursivo patriarcal generalizado.
The health and welfare of dogs belonging to homeless people
Authors: Williams David Leonard , Hogg Sarah
Published: July 2016

A significant number of homeless people own dogs, with these animals contributing to the well-being of their owners by providing emotional support and in many cases, a reason for living as well as acting as what might be termed a social catalyst improving bonds between their owners. Yet many consider that homeless people should not be allowed, let alone encouraged to keep a dog. They consider that living with a homeless people must have a negative impact on the dog’s health and welfare compared to that of a dog owned by people with a home. Here we sought to determine the health and welfare of dogs owned by homeless people, comparing 50 dogs owned by homeless people with 50 owned by people living in a home. In contradistinction to the negative view noted above, we found that dogs owned by homeless people were healthy animals, less likely to be obese, had fewer behaviour issues such as aggression to strangers and separation anxiety  when compared to dogs owned by people living in a conventional home. We suggest that these findings should be taken into account when deciding whether a homeless person with a dog should be allowed into a hostel, and indeed the general attitude of the public to homeless people living with a dog by their side on the street
A PERCEPÇÃO DOS BENEFÍCIOS E DIFICULDADES NA INTERAÇÃO UNIVERSIDADE-EMPRESA: O CASO DOS GRUPOS DE PESQUISA MINEIROS
Authors: Teixeira André Luiz Da Silva , Tupy Igor Santos , Amaral Pedro Vasconcelos Maia do
Published: July 2016

Compreender melhor as dificuldades e benefícios percebidos na interação universidade-empresa é fundamental para que se desenvolva um ambiente mais propício para a inovação e geração de novos conhecimentos. Este artigo analisa a percepção dos grupos de pesquisa mineiros acerca desses benefícios e dificuldades e estima a influência das características dos grupos de pesquisa, canais de transmissão de conhecimento utilizados e grande área do conhecimento sobre indicadores de benefícios e dificuldades. Esses indicadores são computados a partir do método de Análise de Componentes Principais Categóricos e dados do BR Survey. Concluiu-se que: transferir conhecimento via cooperação em P&D eleva os benefícios e dificuldades percebidos no processo; quanto maior o número de patentes licenciadas, menores as dificuldades percebidas; e grupos pertencentes às Engenharias percebem maiores benefícios, bem como maiores dificuldades.
Transient Coupled Borehole/Formation Fluid-Flow Model for Interpretation of Oil/Water Production Logs
Authors: Frooqnia Amir , Torres-Verdín Carlos , Sepehrnoori Kamy , Abdhollah-Pour Rohollah
Published: July 2016

Interpretation of two-phase production logs (PLs) traditionally constructs borehole fluid-flow models decoupled from the physics of reservoir rocks. However, quantifying formation dynamic petrophysical properties from PLs requires simultaneous modeling of both borehole and formation fluid-flow phenomena. This paper develops a novel transient borehole/formation fluid-flow model that allows quantification of the effect of formation petrophysical properties on measurements acquired with production-logging tools (PLTs).

We invoke a 1D, isothermal, two-fluid formulation to simulate borehole fluid-phase velocity, pressure, volume fraction, and density in oil/water-flow systems. The developed borehole fluid-flow model implements oil-dominant and water-dominant bubbly flow regimes with the inversion point taking place approximately when the oil volume fraction is equal to 0.5. Droplet diameter is dynamically modified to simulate interfacial drag effects, and to effectively account for variations of slip velocity in the borehole. Subsequently, a new successive iterative method interfaces the borehole and formation fluid-flow models by introducing appropriate source terms into the borehole fluid-phase mass-conservation equations.

The novel iterative coupling method integrated with the developed borehole fluid-flow model allows dynamic modification of reservoir boundary conditions to accurately simulate transient behavior of borehole crossflow taking place across differentially depleted rock formations. In the case of rapid variations of near-borehole properties, frequent borehole/formation communication inevitably increases the computational time required for fluid-flow simulation. Despite this limitation, in a two-layer reservoir model penetrated by a vertical borehole, the coupling method accurately quantifies a 14% increase of volume-averaged oil-phase relative permeability of the low-pressure layer caused by through-the-borehole cross-communication of differentially depleted layers. Sensitivity analyses indicate that the alteration of near-borehole petrophysical properties primarily depends on formation average pressure, fluid-phase density contrast, and borehole-deviation angle. A practical application of the new coupled fluid-flow model is numerical simulation of borehole production measurements to estimate formation average pressure from two-phase selective-inflow-performance (SIP) analysis. This study suggests that incorporating static (shut-in) PL passes into the SIP analysis could result in misleading estimation of formation average pressure.
An Example of the Success of Legal and Institutional Reform in Romania
Authors: Sora Florina , Eftimie Adriana
Published: July 2016

The National Agency for Mineral Resources (NAMR) was eastablished in 1993 as the regulatory authority to administer the mineral resources of Romania. It is the competent authority under the new Petroleum Law, and its responsabilities include granting concessions based on a new concession agreement in line with the international industry practice, monitoring and controlling the observance of the provisions of the concession agreement, and issuing regulations for the petroleum sector. NAMR benefitted from various programs supported by the World Bank aimed at enhancing its capabilities. Of relevant importance are the "Petroleum Exploration Promotion Program" aimed at attracting private investment by foreign companies, and the "Development of Petroleum Industry Specific Environmental Management Program" financed from a Canadian Grant. The former contributed, through the transfer of know-how to NAMR's personnel, to their successful organizing of two licensing rounds, whereas the implementation of the latter lead to the establishment of environmental management units and preparation of environmental regulations related to the petroleum sector. Since its establishment NAMR has demonstrated its commitment towards implementing the legal reforms related to the Romanian Petroleum Sector and has proved to be a modern and viable institution in an emerging free market economy.
Mental Health and Mood in Expatriate Workers
Authors: Maskery Nasser S. M.
Published: July 2016

Petroleum Development Oman (PDO) employs male workers in its onshore oil industry on a 62 days on and 29 days off schedule.

A cross-sectional study based on three types of questionnaires was conducted on a sample population of workers to investigate any adverse effects on mental health and mood.

Though no unequivocal evidence of ill health was established, there was statistical indication that presence of children and working indoors are associated with an increase in Stress levels and a decrease in Arousal.

Further longitudinal studies on larger population samples are recommended.
Safety Performance for the Global E&P Industry
Authors: Hide D K
Published: July 2016

A key component of effective safety management is the recording and analysis of safety performance measures. The OGP has the most comprehensive database in the upstream E&P industry, and prepares an annual report, analysing the current year's performance for both companies and contractors, in the context of global industry trends. The report not only enables companies to benchmark their performance against industry as a whole, but allows comparison of safety performance between different functions and localities within a company. 1998 data1 showed a continuing improvement trend in Lost Time Injury Frequency, but a worsening Fatal Accident Rate, largely influenced by an air crash in South America.
Establishing a Comprehensive Safe Driving Programme in Kazakhstan
Authors: Head R.
Published: July 2016

Oil and Gas Producers Association safety figures indicate that motor vehicle incidents (MVAs) account for about a quarter of all fatalities in the upstream oil industry. In Central Asia the figure is much higher. In 1998, three quarters of fatalities in Western oil company operated facilities were due to MVAs.

For various reasons MVAs are more common in Central Asia than some other parts of the world and the consequences can also be worse because of the difficulty initiating rescue response activities and the lack of an adequate ambulance recovery and emergency medical services.

For these reasons, driving represents probably the greatest risk to employees working in Central Asian operations, and as such is a critical safety factor for our operations there.

This paper will discuss the content of a comprehensive safe driving programme that has been developed and implemented by Texaco's North Buzachi operation in Western Kazakhstan. Features of the programme include:

driver training clearly communicating driving rules a Permit to Drive Programme minimum safety equipment for vehicles journey planning and logs driver monitors
Journey Management in East Asia
Authors: Tan Gabriel G. , Edwards Milton
Published: July 2016

Driving has been identified as the most dangerous activity facing a Schlumberger employee in East Asia. The diverse driving conditions represent a multitude of risks to an employee. Ferry crossings in Bangladesh, icy roads in Sakhalin, to streets teeming with vehicles, humans and animals in Bangladesh, Myanmar, and Vietnam constitute driving risks that need to be mitigated. The organizational changes in Schlumberger culminating in a common QHSE function has facilitated the cultivation of a safe driving culture.

In 1999, the Driving Policy was enforced applying the Journey Management (JM) approach in managing the entire transportation process to minimize exposure to driving risks in the different locations. The key elements of this process entails management commitment and leadership, review of trip necessity, assignment of equipment and personnel, personnel qualification, tracking critical drives, reducing number of vehicles, and convoying. This process begins with a risk assessment of the driving hazards in each location, developing the local JM policy, the JM audit form, training for managers, and JM audits of these locations.

The JM audit covers all aspects of journey management from checking the location management commitment and leadership, to the local driving policy, the driver's training status, the condition of vehicles, and effective use of driving monitors. This simple audit tool consists of a score-chart and summary of key issues to be urgently addressed in reducing the driving risks. The audit involves location visits by a team of QHSE and location personnel.

JM audits has been completed in Vietnam, Bangladesh, Thailand, Malaysia, Sakhalin, Japan, Myanmar, and Brunei. A review of the audit results against the rate of automotive accidents reflects the success of this program in reducing driving exposures and accidents in East Asia.
Development of a Cost-Effective Oil Spill Response Program on the Norwegian Continental Shelf
Authors: Indrebø Geir , Singsaas Ivar , Skare Ingvild
Published: July 2016

Pre-spill analysis of the feasibility and effectiveness of different oil spill response strategies, such as mechanical recovery and application of dispersants is an essential part of any oil spill contingency planning to optimize the overall "Net Environmental Benefit" of an oil spill combat operation.

This paper describes how the results from a four year research program, the ESCOST ("ESSO-SINTEF Coastal Oil Spill Technology) supplied with further development of modeling tools through e.g. the AMOS (Advanced Management of Oil Spills) Program, were utilized to carry out pre-spill analysis in developing and implementing an Oil Spill Response Plan (OSRP) for a field on the Norwegian continental shelf. Key elements in this process include development of: Oil Spill Response scenarios for specific field developmentCrude oil weathering properties and response possibilities (time window)Stochastic Oil Spill Trajectory Analysis based on weather statistics to determine the influence areaEnvironmental Risk Analysis, including vulnerable environmental resourcesEmergency Preparedness Analysis based on specific emergency preparedness requirementsDevelopment of the Oil Spill Response Plan providing guidance on the utilization of emergency measures, including chemical dispersion, natural dispersion (no action), mechanical recovery, sequence of actions, and logistics and organization.

Furthermore, this presentation will focus on how this OSRP can contribute to provide an improved operational, optimally dimensioned and cost-effective oil spill contingency arrangement utilizing the following features: Dispersant usage, fully integrated in field emergency OSRP, aligned with regulatory requirements for use of dispersantsMechanical equipment adjustments based on the specific oil propertiesVessels specifically designed and developed for OSR capabilitiesSpecific organizational and combat measures for offshore field location, open sea and shorelineDeveloped in close co-operation with authorities and regulatory requirementsUtilization of key research resources, including also verification of response equipment capacity.
Nitrogen Strategy and Seeding Rate Affect Rice Lodging, Yield, and Economic Returns in the Midsouthern United States
Authors: Corbin Jennifer L. , Orlowski John M. , Harrell Dustin L. , Golden Bobby R. , Falconer Larry , Krutz L. Jason , Gore Jeffrey , Cox Michael S. , Walker Timothy W.
Published: July 2016

Seeding rate and N application strategies have been extensively researched for drill‐seeded, delayed flood rice (Oryza sativa L.) production in the midsouthern United States. However, little economic analysis has been performed to determine the effects of seeding rate and N fertilization strategies on high‐yielding, lodging susceptible rice cultivars. The purpose of this research was to determine the effect of multiple N fertilization strategies and seeding rates on rice lodging and grain yield and use the data to determine optimal rice management practices based on evaluation of economic returns. Studies were established in Louisiana and Mississippi during the 2010 and 2012 growing seasons. Rice was drilled at seeding rates of 161, 323, and 483 seeds m−2. Rice was fertilized with N at multiple rates and timings, representing recommended strategies as well as strategies designed to reduce lodging. Lodging and grain yield data were collected and used to determine net returns at high and low rice and N prices. Rice grain yield and net returns were maximized at a seeding rate of 323 seeds m−2. Splitting N application between early‐season (V3) and late‐season (R1 or R3) applications decreased lodging, but resulted in decreased grain yield compared to optimal rates of N applied at V3. The 202 kg N ha−1 applied early‐season (V3) N fertilization strategy maximized both grain yield and net returns, despite relatively high levels of lodging. Optimal N fertilization during early‐vegetative growth appears to be necessary to maximize yield potential in this rice production system.

Core Ideas

Split N application in rice limits lodging but also reduce grain yield.

High N rates and seeding rates increase lodging and harvest costs.

Appropriate early‐season (preflood) N is necessary to maximize rice grain yield.
Autoactualización gerencial, satisfacción laboral y productividad: un estudio correlacional en empresas del Bajío
Authors: Vargas Téllez Juan Alberto
Published: July 2016

Se estudia la relación entre el nivel de Autoactualización (madurez o desarrollo personal) de supervisores, gerentes o empresarios en dieciséis empresas (PYMES) de calzado de la ciudad de León, con los niveles de Satisfacción Laboral y la productividad. En general se aprecia que existe un nivel  medio de satisfacción laboral en casi todas las empresas abordadas, así como perfiles del POI (Personal Orientation Inventory) con niveles abajo del promedio estándar de Autoactualización en los supervisores; se encontraron correlaciones entre la mayoría de escalas del POI (nivel de desarrollo personal del empresario o supervisor), e  ítems de SL (encuesta de satisfacción laboral), especialmente los relacionados con el binomio jefe-subordinado. También se encontraron correlaciones significativas en tres de los cuatro indicadores de productividad considerados para este estudio con la SL.
Oscilaciones de la red de nitruros cúbicos
Authors: Santiago-Pérez Dario G.
Published: July 2016

En el trabajo se estudia la dinámica de los nitruros del grupo III en la estructura blenda de zinc utilizando el modelo de cadenas lineales. Utilizando el hecho de que en direcciones de alta simetría las ramas longitudinales de desacoplan de las transversales se reportan las relaciones entre las constantes de fuerza del problema tridimensional (3D) y de la cadena lineal equivalente en estas direcciones. También mostramos cómo calcular las constantes de fuerza 3D del masivo (y consecuentemente la matriz dinámica en su totalidad) a partir de unos pocos puntos experimentales o teóricos. En particular se determinan las relaciones de dispersión y se calculan las constantes de fuerza de nitruros de Aluminio (AlN) y Galio (GaN).
Perfil de ingreso de alumnos con buen desempeño académico en el primer año de estudios. El caso de la Escuela de Diseño de la Universidad De La Salle Bajío
Authors: Esparza Olmos María Daniela , López Olmos Rafael
Published: July 2016

Introducción:  El sistema educativo universitario se ha enfrentado a varios retos en los últimos tiempos, lo que ha implicado establecer políticas de admisión que permitan seleccionar a los estudiantes que cumplan con el perfil de ingreso, permitiendo generar estrategias para mejorar su desempeño académico a lo largo de sus estudios, y con ello elevar las cifras de la eficiencia terminal.Es así como el objetivo de esta investigación fue caracterizar el perfil de ingreso de los alumnos que mostraron un buen desempeño académico en el primer año de la licenciatura de diseño industrial, diseño de modas y calzado, diseño gráfico y diseño ambiental de la Universidad De La Salle Bajío.Método: La distribución final de la muestra estuvo formada por 256 alumnos de ambos sexos al analizarse estadísticamente los resultados de sus pruebas en el proceso de admisión de las cohortes del 2005 al 2008, para posteriormente correlacionarlas con el promedio del primer año de sus estudios.Resultados: Los resultados permitieron observar las semejanzas y diferencias entre las cuatro licenciaturas con respecto al perfil general de ingreso en la Escuela de Diseño. Asimismo, se encontró que los alumnos que presentaron en periodo de excelencia, obtuvieron mejor desempeño académico en el primer año de estudios.Conclusión: Conocer el perfil de ingreso servirá de parámetro en los siguientes procesos de admisión, además permitirá diseñar estrategias que fortalezcan las capacidades y habilidades de los alumnos al ingresar a la educación superior, de tal manera que se eleven los índices de eficiencia terminal y con ello mejorar la calidad en los programas académicos de licenciatura en la Escuela de Diseño.
Logística Integral: Una alternativa para crear valor y ventajas competitivas en las pequeñas y medianas empresas (pymes) del Sector Calzado
Authors: Villarreal Segoviano Francisco Javier
Published: July 2016

En este documento se plantea la ventaja competitiva como el resultado  que las empresas buscan lograr en un contexto global y de hipercompetitividad; para lograr esto se necesitan estrategias que impulsen esas ventajas competitivas en un ambiente cambiante y dinámico, una de estas estrategias es la logística integral, que busca el equilibrio de la estructura de la cadena de valor de negocio y lograr una interacción y operación eficiente de las áreas de una manera en que las actividades proyecten la creación de valor en las empresas pequeñas y medianas del sector calzado.Las operaciones de una empresa pequeña y mediana tienen un contexto particular en donde presentan ventajas y desventajas, que pueden consolidar o no a una empresa en el plano internacional; previo a esto se necesita plantear la aplicación de la Logística que impulse al cambio y a la consolidación de la creación de valor en el negocio. Se aplicaron sesenta (60) encuestas a empresas pyme adheridas a la cámara de calzado y con la base de datos de COFOCE (Coordinadora de Fomento al Comercio Exterior del Estado de Guanajuato), en donde además de aplicar la encuesta, se hacía un recorrido por las instalaciones y se platicaba de forma informal la realidad y contexto de la empresa, y que generaba también información cualitativa útil. Con ello, se pretendió conocer la realidad de las pequeñas y medianas empresas en León, Gto., identificar los aspectos necesarios para revertir esas desventajas identificadas, como la falta del desarrollo de una logística, la ausencia de planeación estratégica, aplicación de las tecnología de la información y comunicación, falta de competitividad internacional y la falta de creación de valor a lo largo de la cadena de valor del negocio.
Study of Space Charge in SC Shield / XLPE Interface and Mid-Voltage Cable Perfomance
Authors: Tamayo Ávila Idalberto , Nieto Jalil José Manuel , Viteri Jorge , Belana Juan , Diego José Antonio
Published: July 2016

Three experimental mid-voltage cables C2, C3 and C4 with cross-linked polyethylene (XLPE) isolation, rated respectively as Medium, High and Low in perforation tests over 150KV, are studied. All these cables have been systematically measured by Electroacoustic Pulse (PEA) and Thermally Stimulated with Depolarization Currents (TSDC), using 120 KV of polarization voltage in samples as received, annealed at 90 kV and 120°Cup to 672 hours. Measured internal charge of cable C4 at least doubles that of cables C2 and C3. The interfacial phenomenon has been studied by Infrared spectroscopy measurements Attenuated total reflectance (ATR) that show chemical components that migrate, spread, and transport from the external semiconductor layer to the cross-linked polyethene isolation during the thermic treatment of the cable. The PEA measurements using 120 kV/mm electric field showed the formation and propagation of space charge packet from SC to isolation. These results are coherent with TSDC measurements that also show differences in the areas under the curve of current as a function of temperature for each cable type C2, C3and C4. This is a result of the amount of charge accumulated. To sum up, combination of PEA, TSDC and ATR measurements is a useful tool in understanding charge relaxation processes and XLPE cable performance.
Estudio a nivel laboratorio de la Degradación atípica en un refractario tipo SiO2 utilizado en hornos de inducción
Authors: Zuno-Silva J. , Bedolla-Jacuinde A. , Martínez-Vázquez J.M. , Pérez-Perez A. , Quintero-Azuara T.
Published: July 2016

En este trabajo de investigación se realizó un estudio de la degradación atípica que se produce en las paredes de los hornos de inducción. Para esto, se utilizó un material refractario base -  SiO2 (98.8%) con dos escorias de composición química diferente y se analizó su comportamiento mediante las pruebas experimentales del método de copa o crisol y el de inmersión, así como por un modelado asimétrico del metal líquido en el horno de inducción. La escoria, la estructura del material refractario y el mecanismo de penetración de la escoria fueron caracterizados por microscopia óptica, utilizando la técnica de luz reflejada. Los resultados demostraron que, con valores altos de frecuencia (240 Hz), para la operación del horno, se obtiene una fuerza de Lorentz muy alta (14.26 N) pero con una velocidad del metal liquido baja (6 m/s) la cual tiene un vector de dirección perpendicular a las paredes del horno, provocando  presión sobre la escoria incrustada en los poros del refractario favoreciendo el proceso de degradación del material.
Osciladores Caóticos implementados en Microcontrolador PIC18F
Authors: Chiu R. , Mora-González M. , López-Mancilla D.
Published: July 2016

Introducción: Recientemente, los sistemas caóticos han llamado la atención de la comunidad científica internacional, debido a sus potenciales aplicaciones en varias ramas de la ciencia e ingeniería. Se han propuesto muchos trabajos con el fin de resolver algunos problemas interesantes, como la determinación de daños estructurales en los materiales o en sistemas de comunicaciones seguras. Sin embargo, la mayoría de estos trabajos se enfocan en sistemas caóticos en tiempo continuo, mientras que en muchos casos, es deseable que estos sistemas estén en el modo de tiempo discreto y puedan ser utilizados en tiempo real.                      Método: El presente trabajo propone la implementación experimental de tres osciladores caóticos discretizados en un microcontrolador simple. Los osciladores caóticos a implementar son muy conocidos y muy utilizados para ejemplificar posibles soluciones a diversos problemas: los osciladores de Lorenz, Rössler y Chen. Para lo cual, se utilizan tan solo un microcontrolador de bajo costo, unos cuantos resistores y un algoritmo de computación sencillo.Resultados: Se obtiene un sistema embebido de bajo costo y sencillo para implementar osciladores caóticos discretizados.                     Discusión o Conclusión: Se demuestra que los osciladores caóticos de Lorenz, Rössler y Chen pueden implementarse en cualquier microcontrolador de arquitectura basada en palabras de 18 bits o más. Además, se observa que el algoritmo propuesto se pude migrar de un oscilador a otro con solo sustituir el sistema caótico de ecuaciones.
Análisis multicriterio del impacto potencial del turismo en la anidación de las tortugas marinas en Chalacatepec, Jalisco
Authors: Flores-Monter Yasiri Mayeli , Aceves-Quesada F. , García-Romero A. , Peters Recagno E.M.
Published: July 2016

Introducción: El litoral mexicano presenta hábitats aptos para la reproducción, refugio y crianza de tortugas marinas. Sin embargo, en la costa Chalacatepec, Jalisco, esta aptitud puede estar amenazada por el Proyecto Desarrollo Vistas (PDV), un complejo turístico mixto: hotelero, residencial, comercial y deportivo. El objetivo de la presente investigación, es evaluar el impacto potencial del turismo sobre la anidación de tortugas en dos etapas: a) Preparación y construcción y b) Operación y mantenimiento, como una herramienta de ayuda a la toma de decisiones en la conservación de las especies Lepidochelys olivácea (tortuga golfina), Chelonia agassizii (tortuga prieta) y Dermochelys coriácea (tortuga laúd).Método: Se calculó la densidad de anidación (nidos por kilómetro) y se utilizó el método de evaluación multicriterio (EMC) discreto Proceso Analítico Jerárquico (PAJ), para estimar el impacto de 8 amenazas turísticas: desmonte y despalme,  excavaciones,  rellenos,  contaminación sonora,  residuos sólidos, presencia de personal de obra y construcciones provisionales, iluminación artificial del frente de playa y concentración de visitantes. Se construyó una  matriz de comparación, se asignó un peso a cada amenaza, y mediante el uso de un SIG se generaron los mapas de impacto potencial del turismo.Resultados: Las amenazas con mayor peso o ponderación (eigenvector total) fueron los rellenos (0.36482) y la concentración de visitantes (0.38194).  La construcción y operación turística puede afectar el 59.8% de las anidaciones e impactar principalmente en la costa sur el km 1 (1 142 registros de nidos colectados) y, en la costa norte el km 1 (329 nidos), km 3 (311 nidos), km 4 (268 nidos) y km 5 (151 nidos).Discusión o Conclusión: La playa de anidación en Chalacatepec es de gran importancia para la protección y conservación de las tortugas marinas. La presente EMC fue una herramienta adecuada para estimar las consecuencias del turismo de sol y playa, y podría ayudar a las autoridades correspondientes a decidir si el PDV debe construirse.
Clasificador de Heaviside
Authors: García Floriano Andrés , Camacho Nieto Oscar , Yáñez Márquez Cornelio
Published: July 2016

En este trabajo se presenta un nuevo modelo de clasificación de patrones, en modo supervisado, cuyo diseño y operación se basa en la función de Heaviside; este Clasificador de Heaviside es del tipo one shot, lo cual garantiza que el nuevo modelo carecerá de problemas de convergencia.Para lograr lo anterior, se proponen dos operaciones originales, llamadas L y C, en cuyo diseño interviene de manera relevante la función de Heaviside. La fase de aprendizaje de patrones del nuevo modelo está sustentada en la operación original L, mientras que la fase de clasificación de patrones descansa en la efectividad de la nueva operación C.Con objeto de fundamentar teóricamente el Clasificador de Heaviside, se enuncian y demuestran algunos lemas, teoremas y corolarios que exhiben propiedades relevantes de las nuevas operaciones, las cuales inciden directamente en el desempeño del nuevo modelo.En pruebas experimentales preliminares, cuyos resultados se incluyen en el presente artículo, se ha aplicado el Clasificador de Heaviside en algunos bancos de datos conocidos y utilizados por la comunidad académica internacional. El análisis de los datos generados en las pruebas experimentales, evidencian que el desempeño del nuevo modelo es competitivo, y en algunos casos superior, con respecto a modelos destacados en el estado del arte de temas afines a la Inteligencia Computacional, la Minería de Datos, el Reconocimiento y la Clasificación de Patrones (en modo de aprendizaje supervisado).
De la representación Euler-Lagrange de sistemas a la Hamiltoniana generalizada
Authors: Rodríguez Alfaro Luis Humberto , Alcorta-García Efraín
Published: July 2016

La representación Hamiltoniana generalizada de sistemas brinda una estructura que puede ser utilizada con ventaja en muchas ´areas, entre las cuales se puede mencionar el diseño de observadores y el diagnóstico de fallas basado en modelos. Muchos de los trabajos en estos temas tienen como punto de partida al sistema en forma Hamiltoniana generalizada y, en general, se omite la explicación de como llegar a esta representación, por ejemplo, a partir de un modelo no lineal basado en las ecuaciones de Euler-Lagrange. En este trabajo se presenta un análisis detallado de como es que se obtiene la representación Hamiltoniana generalizada de un sistema a partir de las n ecuaciones diferenciales de segundo orden obtenidas con el formalismo Euler-Lagrange. Con la finalidad de mostrar en lo particular, después del caso general, cómo se obtiene la representación Hamiltoniana generalizada, se presentan algunos casos de estudio.
Decolorization of Methylene Blue by Persulfate Activated with FeO Magnetic Particles
Authors: Hung Chang‐Mao , Chen Chiu‐Wen , Liu Yi‐Yuan , Dong Cheng‐Di
Published: July 2016

In this study, the degradation of methylene blue (MB) was conducted to evaluate the feasibility of using persulfate oxidation activated with iron oxide (FeO) magnetic particles. The results demonstrated that the decolorization rate of MB increased with increasing FeO concentration, exhibiting maximum efficiency at pH0 3.0. The kinetics of MB was studied in the binary FeO catalyst and persulfate oxidation system. The surface properties of FeO before and after reaction was analyzed using cyclic voltammogram (CV), three‐dimensional excitation‐emission fluorescence matrix (EEFM) spectroscopy, zeta potential, particle size distribution measurements, X‐ray diffraction (XRD) and environmental scanning electron microscopy‐energy dispersive X‐ray spectrometry (ESEM‐EDS). The CV data indicated that a reversible redox reaction holds the key to explaining the significant activity of the catalyst. EEFM was used to evaluate the catalyst yield of FeO by fluorescence intensity plots with excitation/emission at 220/300 nm and 260/300 nm. The XRD and ESEM‐EDS results confirmed the presence of FeO in the catalyst.
Reductive Removal of Selenate in Water Using Stabilized Zero‐Valent Iron Nanoparticles
Authors: Liu Hongfang , Cai Zhengqing , Zhao Xiao , Zhao Dongye , Qian Tianwei , Bozack Michael , Zhang Mingang
Published: July 2016

Polysaccharide‐stabilized zero‐valent iron (ZVI) nanoparticles were synthesized using sodium carboxymethyl cellulose (CMC) or starch as stabilizer, and tested for reductive removal of selenate in water. Batch kinetic tests showed that the stabilized ZVI nanoparticles offer much faster selenate removal than bare ZVI particles at both pH 6.0 and pH 8.4. X‐ray photoelectron spectroscopy (XPS) analyses confirmed Se(VI) was transformed to Se(IV) and Se(0), which are removed along with the nanoparticles. Neutral pH (~7) was found to be most favorable for the reductive removal. Decreasing pH to 5.0 or increasing it to 8.0 reduced the removal rate of CMC‐stabilized ZVI by a factor of 4.6 or 1.3, respectively, based on the observed first‐order‐rate constant. Dissolved organic matter (DOM) at 5 mg/L as total organic carbon (TOC) had modest inhibitive effect, but DOM at 25 mg/L TOC decreased selenate removal by 25%. The stabilized nanoparticles hold the potential to facilitate in situ remediation of selenate‐contaminated soil and groundwater.