Palindromic 3-stage splitting integrators, a roadmap

The implementation of multi-stage splitting integrators is essentially the same as the implementation of the familiar Strang/Verlet method. Therefore multi-stage formulas may be easily incorporated into software that now uses the Strang/Verlet integrator. We study in detail the two-parameter family of palindromic, three-stage splitting formulas and identify choices of parameters that may outperform the Strang/Verlet method. One of these choices leads to a method of effective order four suitable to integrate in time some partial differential equations. Other choices may be seen as perturbations of the Strang method that increase efficiency in molecular dynamics simulations and in Hybrid Monte Carlo sampling.Comment: 20 pages, 8 figures, 2 table

Analysis of the pedagogical perspective of the MOOCs available in Portuguese

After an initial stage of exponential growth in MOOCs, a need has arisen of to address several different aspects of these innovations in order to understand and develop them from different perspectives, such as this one, with the analysis of pedagogical dimensions aimed at improving course design. This paper presents an updated review of the literature and proposes five research lines for an in-depth approach. This study is part of a broader research project1 and here analyses 356 MOOCs delivered in Portuguese by 16 different platforms. The research design is quantitative, non-experimental and transversal. An adaptation of the MOOC Educational and Interactive Indicators Instrument —INdiMOOC-EdI— was used in the data collection process. The reliability and internal consistency analysis of that adaptation for the whole sample resulted in a Cronbach alpha score of 0.731. The data obtained enable us to classify the existing MOOCs in Portuguese according to descriptive, formative, and interactive components. These different types correlate with the quality indices, being negative in the first dimension (descriptive) and positive in the second and third ones (formative and interactive).Funded by the call for R&D&i projects named: «Estudio del impacto de las erubricas federada en evaluación de las competencias en el practicum» (Study on the impact of federated eRubrics in the evaluation of the competences in the practicum). Plan Nacional de I+D+i de Excelencia (National R&D&i Excellence Plan) (2014-16) no. EDU2013-41974-

Calidad de servicio y procesos administrativos para los centros de salud mental comunitarios en el Callao, 2021

El presente trabajo de investigación se planteó como objetivo determinar la relación entre la Calidad de Servicio y los Procesos administrativos de los Centros de Salud Mental Comunitarios (CSMCs) en el Callao 2021. Este estudio se basó en el método cuantitativo; la investigación se enmarcó en un estudio de nivel correlacional; se desarrolló bajo los pasos propios de una investigación de campo, con un diseño no experimental, cuya recolección de información se fundamentó en la técnica de la encuesta. Como instrumento de recolección de información se utilizó un cuestionario consistente de 27 enunciados. La población y muestra estuvo conformada por 51 trabajadores del área asistencial y administrativa de los Centros de Salud Mental Comunitarios en el Callao, 2021. Los resultados encontrados indican que la hipótesis general es acertada. En este sentido, existen evidencias significativas como para concluir que existe una relación significativa entre la Calidad de Servicio y los Procesos administrativos de los Centros de Salud Mental Comunitarios en el Callao 2021, con un coeficiente Rho Spearman de 0,853, indicando una correlación positiva fuerte, puesto que el p-valor es menor al nivel de significancia de 0,05

Development and characterization of an eggplant (Solanum melongena) doubled haploid population and a doubled haploid line with high androgenic response

[EN] We developed an eggplant doubled haploid (DH) population from a commercial hybrid through androgenesis in microspore culture. Morphological variation, reproductive ability and androgenic responsiveness were evaluated. The DH population showed segregation in vegetative traits related to leaf, flower and fruit, and in reproductive traits such as fruit and seed setting or germination rate. The DH population and subsequent generations also presented variation in the androgenic response, with null, low and high response lines. From this population, we were able to identify the first eggplant highly androgenic DH line (DH36), remarkably similar to the donor hybrid in terms of morphology and reproductive ability, but stably producing four times more calli than the hybrid. The segregating DH population is potentially useful for genetic studies and mapping of several traits, whereas the highly androgenic line DH36 may be used as a model line to facilitate the study of eggplant androgenesis and embryogenesis for both basic and applied research.We would like to thank the reviewers of this manuscript for their critical and helpful comments. This work was supported by Grant AGL2014-55177-R to JMSS from Spanish Ministerio de Economia y Competitividad (MINECO) jointly funded by FEDER. ARS is supported by a Predoctoral Fellowship from the FPI Program of Universitat Politecnica de Valencia.Rivas-Sendra, A.; Manuel Campos-Vega; Calabuig-Serna, A.; Seguí-Simarro, JM. (2017). Development and characterization of an eggplant (Solanum melongena) doubled haploid population and a doubled haploid line with high androgenic response. Euphytica. 213(4):1-14. doi:10.1007/s10681-017-1879-3S1142134Alpsoy HC, Seniz V (2007) Researches on the in vitro androgenesis and obtaining haploid plants in some eggplant genotypes. Acta Hortic 729:137–141Başay S, Şeniz V, Ellialtioğlu Ş (2011) Obtaining dihaploid lines by using anther culture in the different eggplant cultivars. J Food Agric Environ 9:188–190Bohanec B (2002) Doubled-haploid onions. In: Rabinowitch HD, Currah L (eds) Allium crop science: recent advances. CABI Publishing, Wallingford, pp 145–157Corral-Martínez P, Seguí-Simarro JM (2012) Efficient production of callus-derived doubled haploids through isolated microspore culture in eggplant (Solanum melongena L.). Euphytica 187:47–61Corral-Martínez P, Seguí-Simarro JM (2014) Refining the method for eggplant microspore culture: effect of abscisic acid, epibrassinolide, polyethylene glycol, naphthaleneacetic acid, 6-benzylaminopurine and arabinogalactan proteins. Euphytica 195:369–382Corral-Martínez P, Parra-Vega V, Seguí-Simarro JM (2013) Novel features of Brassica napus embryogenic microspores revealed by high pressure freezing and freeze substitution: evidence for massive autophagy and excretion-based cytoplasmic cleaning. J Exp Bot 64:3061–3075Daghma DES, Hensel G, Rutten T, Melzer M, Kumlehn J (2014) Cellular dynamics during early barley pollen embryogenesis revealed by time-lapse imaging. Front Plant Sci 5:675Doğramacı-Altuntepe M, Peterson TS, Jauhar PP (2001) Anther culture-derived regenerants of durum wheat and their cytological characterization. J Hered 92:56–64Dumas de Vaulx R, Chambonnet D (1982) Culture in vitro d’anthères d’aubergine (Solanum melongena L.): stimulation de la production de plantes au moyen de traitements à 35°C associés à de faibles teneurs en substances de croissance. Agronomie 2:983–988Dumas de Vaulx R, Chambonnet D, Pochard E (1981) Culture in vitro d’anthères de piment (Capsicum annuum L.): amèlioration des taux d’obtenction de plantes chez différents génotypes par des traitments à +35°C. Agronomie 1:859–864Eudes F, Shim Y-S, Jiang F (2014) Engineering the haploid genome of microspores. Biocatal Agric Biotechnol 3:20–23FAOSTAT (2016). http://faostat.fao.org . Accessed Dec 2016Ferrie A, Caswell K (2011) Isolated microspore culture techniques and recent progress for haploid and doubled haploid plant production. Plant Cell Tissue Organ Cult 104:301–309Ferrie AMR, Keller WA (1995) Microspore culture for haploid plant production. In: Gamborg OL, Phillips GC (eds) Plant cell, tissue and organ culture: fundamental methods. Springer, Berlin, pp 155–164Ferrie A, Möllers C (2011) Haploids and doubled haploids in Brassica spp. for genetic and genomic research. Plant Cell Tissue Organ Cult 104:375–386Ferrie AMR, Palmer CE, Keller WA (1995) Haploid embryogenesis. In: Thorpe TA (ed) In vitro embryogenesis in plants. Kluwer Academic Publishers, Dordrecht, pp 309–344Forster BP, Heberle-Bors E, Kasha KJ, Touraev A (2007) The resurgence of haploids in higher plants. Trends Plant Sci 12:368–375Frary A, Doganlar S, Daunay MC (2007) Eggplant. In: Kole C (ed) Vegetables. Springer, Berlin, pp 287–313Germanà MA (2011a) Anther culture for haploid and doubled haploid production. Plant Cell Tissue Organ Cult 104:283–300Germanà MA (2011b) Gametic embryogenesis and haploid technology as valuable support to plant breeding. Plant Cell Rep 30:839–857Hoekstra S, Vanzijderveld MH, Louwerse JD, Heidekamp F, Vandermark F (1992) Anther and microspore culture of Hordeum vulgare L. cv. Igri. Plant Sci 86:89–96Immonen S, Robinson J (2000) Stress treatments and Ficoll for improving green plant regeneration in triticale anther culture. Plant Sci 150:77–84Kaeppler SM, Kaeppler HF, Rhee Y (2000) Epigenetic aspects of somaclonal variation in plants. Plant Mol Biol 43:179–188Kasha KJ, Simion E, Miner M, Letarte J, Hu TC (2003) Haploid wheat isolated microspore culture protocol. In: Maluszynski M, Kasha KJ, Forster BP, Szarejko I (eds) Doubled haploid production in crop plants. Kluwer Academic Publishers, Dordrecht, pp 77–82Li H, Soriano M, Cordewener J, Muiño JM, Riksen T, Fukuoka H, Angenent GC, Boutilier K (2014) The histone deacetylase inhibitor Trichostatin A promotes totipotency in the male gametophyte. Plant Cell 26:195–209Malik MR, Wang F, Dirpaul J, Zhou N, Hammerlindl J, Keller W, Abrams SR, Ferrie AMR, Krochko JE (2008) Isolation of an embryogenic line from non-embryogenic Brassica napus cv. Westar through microspore embryogenesis. J Exp Bot 59:2857–2873Miah MAA, Earle ED, Khush GS (1985) Inheritance of callus formation ability in anther cultures of rice, Oryza sativa L. Theor Appl Genet 70:113–116Miyoshi K (1996) Callus induction and plantlet formation through culture of isolated microspores of eggplant (Solanum melongena L.). Plant Cell Rep 15:391–395Nitsch JP (1972) Haploid plants from pollen. Z Pflanzenzücht 67:3–18Nitsch C, Nitsch JP (1967) Induction of flowering in vitro in stem segments of Plumbago indica L. I. Production of vegetative buds. Planta 72:355Nuez F, Llácer G (2001) La horticultura española. Ediciones de Horticultura, S.L., ReusOleszczuk S, Rabiza-Swider J, Zimny J, Lukaszewski AJ (2011) Aneuploidy among androgenic progeny of hexaploid triticale (XTriticosecale Wittmack). Plant Cell Rep 30:575–586Petolino JF, Jones AM, Thompson SA (1988) Selection for increased anther culture response in maize. Theor Appl Genet 76:157–159Quimio CA, Zapata FJ (1990) Diallel analysis of callus induction and green-plant regeneration in rice anther culture. Crop Sci 30:188–192Rivas-Sendra A, Corral-Martínez P, Camacho-Fernández C, Seguí-Simarro JM (2015) Improved regeneration of eggplant doubled haploids from microspore-derived calli through organogenesis. Plant Cell Tissue Organ Cult 122:759–765Rizza F, Mennella G, Collonnier C, Shiachakr D, Kashyap V, Rajam MV, Prestera M, Rotino GL (2002) Androgenic dihaploids from somatic hybrids between Solanum melongena and S. aethiopicum group Gilo as a source of resistance to Fusarium oxysporum f. sp. melongenae. Plant Cell Rep 20:1022–1032Rotino GL (1996) Haploidy in eggplant. In: Jain SM, Sopory SK, Veilleux RE (eds) In vitro haploid production in higher plants. Kluwer Academic Publishers, Dordrecht, pp 115–141Rotino GL, Restaino F, Gjomarkaj M, Massimo M, Falavigna A, Schiavi M, Vicini E (1991) Evaluation of genetic variability in embryogenetic and androgenetic lines of eggplant. Acta Hortic 300:357–362Rotino GL, Sihachakr D, Rizza F, Vale G, Tacconi MG, Alberti P, Mennella G, Sabatini E, Toppino L, D’Alessandro A, Acciarri N (2005) Current status in production and utilization of dihaploids from somatic hybrids between eggplant (Solanum melongena L.) and its wild relatives. Acta Physiol Plant 27:723–733Salas P, Prohens J, Seguí-Simarro JM (2011) Evaluation of androgenic competence through anther culture in common eggplant and related species. Euphytica 182:261–274Salas P, Rivas-Sendra A, Prohens J, Seguí-Simarro JM (2012) Influence of the stage for anther excision and heterostyly in embryogenesis induction from eggplant anther cultures. Euphytica 184:235–250Sanguineti MC, Tuberosa R, Conti S (1990) Field evaluation of androgenetic lines of eggplant. Acta Hortic 280:177–182Seguí-Simarro JM (2016) Androgenesis in Solanaceae. In: Germanà MA, Lambardi M (eds) In vitro embryogenesis. Springer, New York, pp 209–244Seguí-Simarro JM, Nuez F (2008) Pathways to doubled haploidy: chromosome doubling during androgenesis. Cytogenet Genome Res 120:358–369Seguí-Simarro JM, Corral-Martínez P, Parra-Vega V, González-García B (2011) Androgenesis in recalcitrant solanaceous crops. Plant Cell Rep 30:765–778Snape JW, Sitch LA, Simpson E, Parker BB (1988) Tests for the presence of gametoclonal variation in barley and wheat doubled haploids produced using the miah system. Theor Appl Genet 75:509–513Soriano M, Li H, Jacquard C, Angenent GC, Krochko J, Offringa R, Boutilier K (2014) Plasticity in cell division patterns and auxin transport dependency during in vitro embryogenesis in Brassica napus. Plant Cell 26:2568–2581Toppino L, Mennella G, Rizza F, D’Alessandro A, Sihachakr D, Rotino GL (2008) ISSR and isozyme characterization of androgenetic dihaploids reveals tetrasomic inheritance in tetraploid somatic hybrids between Solanum melongena and Solanum aethiopicum group Gilo. J Hered 99:304–315Uzun S (2007) Effect of light and temperature on the phenology and maturation of the fruit of eggplant (Solanum melongena) grown in greenhouses. N Z J Crop Hortic Sci 35:51–59van der Weerden GM, Barendse GWM (2007) A web-based searchable database developed for the EGGNET project and applied to the Radboud University Solanaceae database. Acta Hortic 745:503–506Veilleux RE (1998) Gametoclonal variation in crop plants. In: Jain SM, Brar DS, Ahloowalia BS (eds) Somaclonal variation and induced mutations in crop improvement. Springer, Dordrecht, pp 123–133Yamagishi M, Yano M, Fukuta Y, Fukui K, Otani M, Shimada T (1996) Distorted segregation of RFLP markers in regenerated plants derived from anther culture of an F1 hybrid of rice. Genes Genet Syst 71:37–41Zhang FL, Takahata Y (2001) Inheritance of microspore embryogenic ability in Brassica crops. Theor Appl Genet 103:254–25

Sistema de control basado en PLC y HMI para la automatización de una máquina de moldes de plástico en una fábrica de Chiclayo

La “Fábrica de Accesorios y Tuberías Plásticas” cuenta con una máquina de moldes de plástico. Esta máquina es controlada manualmente por los operadores porque no cuenta con un sistema de control automático para supervisar y controlar su operación. Debido a esto la máquina es susceptible a fallar, la adquisición de datos de producción es ineficiente y no tiene la capacidad indicar la cantidad de piezas producidas. Es por ello que el objetivo de esta investigación fue desarrollar un sistema de control automatizado formado por un PLC, un panel HMI, entre otros componentes, para reducir la participación de los operarios y monitorear la operación de la máquina. Para lograrlo se diseñó la lógica de control del PLC, la interfaz gráfica para el panel HMI y se diseñaron los planos eléctricos de los circuitos de fuerza, control y comunicación. Finalmente, las simulaciones realizadas demostraron que el PLC logró procesar las señales digitales y analógicas, y ejecutar acciones de control de forma automática. La interfaz gráfica de operador permitió seleccionar el tipo y cantidad de piezas a producir, configurar los tiempos de ejecución del proceso, visualizar las etapas de producción mediante animaciones y registrar las piezas producidas. Por lo tanto, se concluye que el sistema propuesto puede reducir la intervención del operario en el monitoreo y en el control de la producción de piezas mediante la automatización de la máquina de moldes de plásticos

Política y comportamiento electoral en Brasil: ¿Una democracia en riesgo?

Brasil vivió un proceso marcado por discursos de reivindicación altamente violentos, de intentos vacíos de unificación y de temores hacia el retorno del autoritarismo brasileño. Este trabajo reflexiona sobre elementos importantes de las pasadas elecciones en ese país. Muestra algunos de los efectos producidos por los dos proyectos políticos en disputa: el de Jair Bolsonaro y el de Fernando Haddad. Promueve el debate sobre la democracia en Brasil y en América Latina. Una elección caracterizada por la polarización, por dos candidatos extremamente opuestos donde uno apostaba por el autoritarismo, mientras el otro defendía la democracia. Brazil experienced a process marked by highly violent vindication discourses, empty attempts at unification and fears about the return of Brazilian authoritarianism. This work reflects on important elements of the last elections in that country. It shows some of the effects produced by the two political projects in dispute: that of Jair Bolsonaro and that of Fernando Haddad. Promotes the debate on democracy in Brazil and Latin America. An election characterized by polarization, by two extremely opposed candidates where one bet on authoritarianism, while the other defended democracy

A comparative study of selected sorbents for sampling of aromatic VOCs from indoor air

Indoor air canbecome pollutedwith VOCs, and understanding the factors which affect adsorption of VOCs from indoor air is important for: (i) the accurate measurement of VOCs, and (ii) to apply mitigation strategies when high analyte concentrations are measured. In this study four VOCs (toluene, ethylbenzene, cumene and dichlorobenzene) were generated as a constant and controlled polluted air stream of VOCs from a dynamic atmospheric chamber. The effects of relative humidity, and sampling flow rate, on adsorption onto Tenax TA and the relatively new silica adsorbents SBA-15 or MCM-41 were studied

El Liderazgo Y Su Incidencia En El Desempeño Laboral En La Empresa Librerias Crisol S.A.C. En El Periodo 2017.

La presente Investigación sobre “el liderazgo y su incidencia en el desempeño laboral en la empresa Librerías Crisol SAC en el periodo 2017” el objetivo de investigación en base a las variables estudiadas, “liderazgo y el desempeño laboral” es considerar una herramienta valiosa para que todos los profesionales, técnicos y personal operativo, quienes se desempeñan en diferentes áreas en la empresa Librerías Crisol SAC. Genere mediante su líder acciones que sumen de manera significativa en la rentabilidad de en la cadena de la empresa antes mencionada. El método empleado fue de carácter básico, en un nivel descriptivo y un diseño correlacional; la población estuvo enmarcada por p = 36 empleados, cumpliendo los criterios de inclusión y exclusión la muestra fue n = 36, siendo un muestreo probabilístico. La importancia de la investigación, consiste en mejorar el desempeño laboral y así obtener mayor orden en la distribución de actividades, detallado en el manual de funciones. Las técnicas para la recopilación que se usaron fue la encuesta. El material utilizado mediante un cuestionario. Aplicando Microsoft office Excel para el procesamiento de datos: ordenamiento y clasificación, registro manual, y el proceso computarizado. En el análisis de información: análisis documental, indagación, conciliación de datos, tabulación, comprensión de gráficos. Teniendo como resultado más importante el 90 por ciento de los encuestados acepta que el Liderazgo es necesario para el desempeño laboral y así nos ayuda a facilitar la toma de decisiones en la empresa librerías crisol SACThe present Investigation on "the leadership and its incidence in the labor performance in the company Librerías Crisol SAC. in the period 2017 "the objective was to determine the relationship between the independent and dependent variables, work performance and leadership that is considered a valuable tool for all those professionals, technicians and operative personnel who work in the company Librerías Crisol SAC. which will be developed at work, guiding their strategies and actions in order to increase the profitability of these companies. This research thesis is basic, level and descriptive-correlational design. The population is composed of 100 people and the sample by 40 between managers and operators. The type of sampling was probabilistic. The importance of the following research thesis is to improve job performance and obtain greater order in the distribution of activities, detailed in the manual of functions. The techniques for the collection that were used was the survey. The material used by means of a questionnaire. Applying Microsoft office Excel for data processing: ordering and classification, manual registration, and the computerized process. In the analysis of information: documentary analysis, inquiry, data reconciliation, tabulation, understanding of graphics. With the most important result, 90 percent of respondents accept that Leadership is necessary for job performance and thus helps us to facilitate the decision making in the company bookstores Crisol SAC.Tesi

Multilayer homogeneous dielectric filler for electromagnetic invisibility

En los últimos años, la invisibilidad se ha convertido en un área de investigación de creciente interés debido a los avances en la ingeniería de materiales. Puede ser posible lograr la invisibilidad a través de dispositivos de camuflaje, recubriendo el cuerpo con una o más capas de materiales con las propiedades electromagnéticas adecuadas. Mediante el uso de técnicas asociadas al camuflaje plasmónico es posible obtener también la invisibilidad de pequeños objetos con varias capas de materiales homogéneos que trabajan desde el interior del objeto. Demostramos numéricamente que es, por lo tanto, posible lograr la invisibilidad a través de un sistema interno basado en técnicas de cancelación de la dispersión.In recent years, invisibility has become a research area of increasing interest due to the advances in material engineering. It may be possible to achieve invisibility through cloaking devices by coating the body using one or more layers of materials with the proper electromagnetic properties. By using techniques associated to plasmonic cloaking it is maybe possible to obtain also invisibility for small objects with several layers of homogeneous materials working from inside the object. We demonstrate numerically that it is, therefore, possible to achieve invisibility through an inner system based on scattering cancellation techniques.• Gobierno de España y Fondos Europeos de Desarrollo Regional. Proyecto TEC2017-85376-C2-X-R (I+D+i) • Ministerio de Educación, Cultura y Deportes. Proyecto FPU 00022/15peerReviewe