Free Form of the Foldy-Wouthuysen Transformation in External Electromagnetic Fields

We derive the exact Foldy-Wouthuysen transformation for Dirac fermions in a time independent external electromagnetic field in the basis of the Ritus eigenfunctions, namely the eigenfunctions of the operator $(\gamma \cdot \Pi)^2$, with $\Pi^\mu = p^\mu - e A^\mu$. In this basis, the transformation acquires a free form involving the dynamical quantum numbers induced by the field.Comment: 8 pages. Accepted in J. Phys. A: Math. and Theo. (Fast Track Communication

Trascendencia e inmanencia del Intelecto. Los casos de Anaxágoras y Giordano Bruno

The article presents and compares the perspectives of Anaxagoras and Giordano Bruno on the intellect as an efficient cause of the world. It is shown that while both concepts indicate the transcendence and the immanence of the intellect, neither manages to establish either transcendence or immanence in a categorical manner. This ambivalence shows that the intelligent cause of the world is detectable in nature because of its actions, but not because of its being.El artículo presenta y relaciona los planteamientos de Anaxágoras y de Giordano Bruno acerca de un intelecto comprendido como la causa eficiente del mundo. Se muestra que ambas concepciones indican ya la trascendencia, ya la inmanencia del intelecto; sin embargo, ninguna termina por afirmar su ser trascendente o inmanente de manera categórica. Esta ambivalencia compartida pone de manifiesto que la causa inteligente es perceptible en la naturaleza por su acción, pero no por su ser

Evaluación de impacto de los recursos informativos bibliotecarios en la competitividad académica de universidades mexicanas, mediante modelos de ecuaciones estructurales (PLS-SEM)

The causal relationships and impact of the different librarian information resources (printed, digital, services and physical spaces) on the academic competitiveness (productivity, quality and innovation) of 33 accredited Mexican universities are evaluated applying structural equation models (SEM) with the technique of partial least squares (PLS). The results show that some of the information resources positively impact productivity and academic quality, but not innovation. The PLS-SEM multivariate analysis proved to be very valuable in assessing the causal relationships in the proposed models, so its use is widely recommended.Se evalúan las relaciones causales y el impacto que tienen los distintos recursos informativos bibliotecarios (impresos, digitales, servicios y espacios físicos) en la competitividad académica (productividad, calidad e innovación) de 33 universidades públicas mexicanas acreditadas, mediante modelos de ecuaciones estructurales (SEM) con la técnica de cuadrados mínimos parciales (PLS). Los resultados muestran que algunos de los recursos informativos impactan positivamente a la productividad y la calidad académica, más no así a la innovación. El análisis multivariado PLS-SEM demostró ser muy valioso para evaluar las relaciones causales en los modelos propuestos, por lo que se recomienda ampliamente su empleo

Health-care guidelines and policies during the COVID-19 pandemic in Mexico: a case of health-inequalities

Background Heterogeneous government responses have been reported in reaction to COVID-19. The aim of this study is to generate an exploratory review of healthcare policies published during COVID-19 by health-care institutions in Mexico. Analyzing policies within different health sub-systems becomes imperative in the Mexican case due to the longstanding fragmentation of the health-care system and health inequalities. Data and Methods Policies purposely included in the analysis were published by four public health institutions (IMSS, ISSSTE, SSA and PEMEX) during the COVID-19 epidemic in Mexico (from February 29th to June 15th, 2020) on official institutional websites. Researchers reviewed each document and classified them into seven policy categories set by the Rapid Research Evaluation and Appraisal Lab (RREAL): public health response, health-care delivery, human resources, health-system infrastructure and supplies, clinical response, health-care management, and epidemiological surveillance. Results Policy types varied by health institution. The largest number of policies were aimed at public health responses followed by health-care delivery and human resources. Policies were mainly published during the community transmission phase. Conclusions The pandemic exposed underlying health-care system inequalities and a reactive rather than prepared response to the outbreak. Additionally, this study outlines potential policy gaps and delays in the response that could be avoided in the future

“PMA Sounds Fun”: Negotiating Drug Discourses Online

In 2007, a young woman, Annabel Catt, died after consuming a capsule sold as “ecstasy” that contained para-methoxyamphetamine. In this paper, we describe how this death was depicted in online drug-user communities and illustrate how the meanings of drug use are negotiated in online settings. News articles, public online discussions, and online fieldwork formed the data. This paper demonstrates how dominant drug discourses may be resisted by drug users, drawing on theories of health resistance and Kane Race’s concept of counter public health. Online environments may offer ways of engaging people who use drugs that acknowledge both pleasure and safety. The study’s limitations are noted

Adolescents opinions regarding Plato del Bien Comer Maya as nutrition health promotion tool

Conocer opiniones sobre el Plato del Bien Comer Maya de adolescentes de Cholul, Yucatán, para mejorar la herramienta comunicativa y utilizarla en actividades de promoción de la salud. Material y métodos. Estudio cualitativo, de investigación formativa. Se realizaron tres grupos focales, participaron 28 adolescentes de secundaria: 12-16 años. Criterios de inclusión: pertenecer a alguno de los tres grados de la escuela y tener familias originarias del poblado. El análisis de los datos se realizó manualmente. Resultados. En comparación con el Plato del Bien Comer nacional, el Plato Maya fue mejor identificado por tener elementos locales a los que pueden acceder fácilmente y con costos menores. Se identificó la palabra fruto como una variación lingüística que representa en ese contexto tanto a las frutas como a las verduras. Conclusiones. Para tener mejores resultados en intervenciones nutricionales es necesario diseñar estrategias educativo-comunicativas acordes con la cultura local.To know opinions of adolescents from Cholul, Yucatán, about Plato del Bien Comer Maya in order to improve it as health promotion tool. Qualitative study, formative research. Three focus groups were carried out, participating 28 adolescents: 12-16 years old. Criteria of inclusion: studying middle school; to have native family from the town. Analysis of the data made manually. Results. Comparatively with the national Plato del Bien Comer, the Plato Maya was better identified because have local food products easier to obtain and cheaper. The principal finding was to understand Fruto is a linguistic variation word which represents in Maya context both fruits and vegetables. This might be an important key to improve health promotion activities with that population. In order to have better results in nutritional interventions, it is necessary to design educational-communicative strategies in accordance with the local culture.Fil: Zulema Morayma Cabrera Araujo. Universidad Autónoma de Yucatán; MéxicoFil: Víctor Hernández Escalante. Universidad Autónoma de Yucatán; MéxicoFil: Alina Marín Cárdenas. Universidad Autónoma de Yucatán; MéxicoFil: Rocío Murguía Argüelles. Universidad de Oriente; MéxicoFil: Noel Magaña Be. Universidad de Oriente; MéxicoFil: Karla Ramón Escobar. Universidad de Oriente; MéxicoFil: Javier Hirose López. Universidad de Oriente; MéxicoFil: Lázaro Tuz Chi. Universidad de Oriente; MéxicoFil: Abril Salas Góngora. Universidad de Oriente; MéxicoFil: Joed Peña Alcocer. Universidad de Oriente; MéxicoFil: Tumas, Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad. Universidad Nacional de Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad; ArgentinaFil: Carlos Castro Sansores. Universidad Autónoma de Yucatán; MéxicoFil: Clara Juárez Ramírez. Instituto de Salud Pública de México; Méxic

Drivers of Innovation Using BIM in Architecture, Engineering, and Construction Firms

This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://doi.org/10.1061/9780784482889.023[Otros] Architecture, engineering, and construction (AEC) firms need to innovate in order to increase their business¿ competitiveness. Many companies around the world are considering the possibility of implementing building information modelling (BIM) in their projects without knowing its actual benefits for the business. The current literature recognizes certain barriers to BIM implementation; therefore, considering these barriers, this work proposes a holistic model that allows managers to explain how BIM can play an important role for the success of the AEC companies. The pillars of the model are a collaborative culture and training of employees in order to break down technological barriers. This way, BIM can help AEC companies to innovate. This proposal takes into consideration the three phases of the infrastructure life-cycle. In the design phase, the model considers 3D shape, scheduling (4D), costs (5D), and sustainability (6D). In the construction phase, the model focuses on supply chain and quality management. During the operation phase, the model is related to the virtual management of maintenance activities. Drivers of innovation should consider several facets: marketing, technology, organization, processes, and products. This model aims to enlighten the positive effects of a good strategic management using BIM on innovation activities in each of the phases of the infrastructure life-cycleVillena, F.; García-Segura, T.; Pellicer, E. (2020). Drivers of Innovation Using BIM in Architecture, Engineering, and Construction Firms. American Society of Civil Engineers. 210-222. https://doi.org/10.1061/9780784482889.023S210222Aibinu, A., & Venkatesh, S. (2014). 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Interorganizational use of building information models: potential for automational, informational and transformational effects. Construction Management and Economics, 25(3), 289-296. doi:10.1080/01446190600892995Franco, J., Mahdi, F., & Abaza, H. (2015). Using Building Information Modeling (BIM) for Estimating and Scheduling, Adoption Barriers. Universal Journal of Management, 3(9), 376-384. doi:10.13189/ujm.2015.030905Hameed, M. A., Counsell, S., & Swift, S. (2012). A conceptual model for the process of IT innovation adoption in organizations. Journal of Engineering and Technology Management, 29(3), 358-390. doi:10.1016/j.jengtecman.2012.03.007Harness S. H. (2008). 2008 documents AIA advance the use of BIM and integrated project delivery [online] [5 Diciembre 2008]. Available from Internet: http://www.aia.orgHobday, M. (2005). Firm-level Innovation Models: Perspectives on Research in Developed and Developing Countries. Technology Analysis & Strategic Management, 17(2), 121-146. doi:10.1080/09537320500088666Hong Y. Hammad A. Sepasgozar S. and Akbarnezhad A. (2019). "BIM adoption model for small and medium construction organizations in Australia" Engineering Construction and Architectural Management 26(2) 154-183. https://doi.org/10.1108/ECAM-04-2017-006410.1108/ECAM-04-2017-0064Hurley, R. F., & Hult, G. T. M. (1998). Innovation, Market Orientation, and Organizational Learning: An Integration and Empirical Examination. Journal of Marketing, 62(3), 42-54. doi:10.1177/002224299806200303Khosrowshahi, F., & Arayici, Y. (2012). Roadmap for implementation of BIM in the UK construction industry. Engineering, Construction and Architectural Management, 19(6), 610-635. doi:10.1108/09699981211277531Kleinschmidt, E. J., de Brentani, U., & Salomo, S. (2007). Performance of Global New Product Development Programs: A Resource-Based View. Journal of Product Innovation Management, 24(5), 419-441. doi:10.1111/j.1540-5885.2007.00261.xLee, S., Yu, J., & Jeong, D. (2015). BIM Acceptance Model in Construction Organizations. Journal of Management in Engineering, 31(3), 04014048. doi:10.1061/(asce)me.1943-5479.0000252Lu, Q., & Lee, S. (2017). Image-Based Technologies for Constructing As-Is Building Information Models for Existing Buildings. Journal of Computing in Civil Engineering, 31(4), 04017005. doi:10.1061/(asce)cp.1943-5487.0000652Miettinen, R., & Paavola, S. (2014). Beyond the BIM utopia: Approaches to the development and implementation of building information modeling. Automation in Construction, 43, 84-91. doi:10.1016/j.autcon.2014.03.009Motamedi, A., Hammad, A., & Asen, Y. (2014). Knowledge-assisted BIM-based visual analytics for failure root cause detection in facilities management. Automation in Construction, 43, 73-83. doi:10.1016/j.autcon.2014.03.012Oduyemi O Okoroh MI Fajana OS. (2017). "The application and barriers of BIM in sustainable building design" Journal of Facilities Management 15(1):15−34. https://doi.org/10.1108/JFM-03-2016-0008.10.1108/JFM-03-2016-0008Olawumi, T. O., Chan, D. W. M., Wong, J. K. W., & Chan, A. P. C. (2018). Barriers to the integration of BIM and sustainability practices in construction projects: A Delphi survey of international experts. Journal of Building Engineering, 20, 60-71. doi:10.1016/j.jobe.2018.06.017Ozorhon, B., & Oral, K. (2017). Drivers of Innovation in Construction Projects. Journal of Construction Engineering and Management, 143(4), 04016118. doi:10.1061/(asce)co.1943-7862.0001234Papadonikolaki, E. (2018). Loosely Coupled Systems of Innovation: Aligning BIM Adoption with Implementation in Dutch Construction. Journal of Management in Engineering, 34(6), 05018009. doi:10.1061/(asce)me.1943-5479.0000644Pellicer, E., Yepes, V., Correa, C. L., & Alarcón, L. F. (2014). Model for Systematic Innovation in Construction Companies. 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Linking multiple layers of innovation-oriented corporate culture, product program innovativeness, and business performance: a contingency approach. Journal of the Academy of Marketing Science, 41(3), 283-299. doi:10.1007/s11747-012-0306-5Succar, B., & Kassem, M. (2015). Macro-BIM adoption: Conceptual structures. Automation in Construction, 57, 64-79. doi:10.1016/j.autcon.2015.04.018Succar, B. (2009). Building information modelling framework: A research and delivery foundation for industry stakeholders. Automation in Construction, 18(3), 357-375. doi:10.1016/j.autcon.2008.10.003Taylor, J. E., & Bernstein, P. G. (2009). Paradigm Trajectories of Building Information Modeling Practice in Project Networks. Journal of Management in Engineering, 25(2), 69-76. doi:10.1061/(asce)0742-597x(2009)25:2(69)Tekla Corporation. (2013). Basic concepts [online] [ 16 Enero 2013]. Available from Internet: http://www.tekla.comVillena Manzanares, F., & Galiano Coronil, A. (2017). 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Recent Chicano poetry = Neueste Chicano-Lyrik. - Zweisprachig: Englisch / Deutsch

Die legalen und illegalen Einwanderer aus Mexiko haben in den USA in Malerei, Musik, Film und Literatur eine eigene Kultur entwickelt, die im Spannungsfeld zwischen mexikanischen Traditionen und der politisch-sozialen Realität in den Vereinigten Staaten angesiedelt ist. Im vorliegenden Band werden die verschiedenen lyrischen Tendenzen innerhalb dieser wahrhaft inter-amerikanischen Bewegung dokumentiert