Assessing the long-distance repellency of long-lasting insecticide netting to a suite of post-harvest insects

Insects are our main competitors for food on the planet (1). In fact, growers lose 10-30% of crops during storage, processing, and marketing after harvest each year to stored product insects (2,3). Challenges to current management include increasing insecticide resistance to phosphine (4), which is the most common insect fumigant. Another challenge has been an increasing demand for organic or low insecticide-input products by consumers (5). To meet these challenges we came up with an alternative management approach, a long lasting insecticide netting (LLIN). Insecticide-treated nets have been widely used as a tool for malaria vector control in tropical regions since the early 1990s (6). These nets are typically treated with a pyrethroid insecticide, such as permethrin or deltamethrin, which repel, incapacitate, and kill mosquitoes that land on the nets. Researchers have recently begun exploring the use of LLINs for management of agricultural pests in high value specialty crops (7). More recently, work with LLINs in post-harvest settings has demonstrated that this tool can induce mortality, as well as significantly decrease the movement and dispersal capacity of post-harvest insects (8). Some possible uses for LLIN include being used to line windows, vents, eaves, or other openings into food facilities. However, anecdotal evidence from IPM practitioners has suggested that pyrethroids, which the LLIN contains, may be repellent to specific groups of insects. In order for LLIN to be an effective tool at intercepting and preventing infestation by stored product insects, we must demonstrate that the netting is not repellent to a range of post-harvest insects

DARE-Web: Domain Analysis in a Web Environment

DARE-Web is a Web-based environment that supports domain analysis - the activity of identifying and documenting the commonalities and variabilities in related software systems. DARE-Web supports the capture of domain information from experts, documents, and code in a domain

Report on the Orientation Study of The Perceptual Form of the City

Report created as part of the Perceptual Form of the City, a research project investigating the individual’s perception of the urban landscape

Work and energy in inertial and non inertial reference frames

It is usual in introductory courses of mechanics to develop the work and energy formalism from Newton's laws. On the other hand, literature analyzes the way in which forces transform under a change of reference frame. Notwithstanding, no analogous study is done for the way in which work and energy transform under those changes of reference frames. We analyze the behavior of energy and work under such transformations and show explicitly the expected invariance of the formalism under Galilean transformations for one particle and a system of particles. The case of non inertial systems is also analyzed and the fictitious works are characterized. In particular, we show that the total fictitious work in the center of mass system vanishes even if the center of mass defines a non inertial frame. Finally, some subtleties that arise from the formalism are illustrated by examples.Comment: 4 pages, 2 figures. LaTeX2e. Part of the approach has been changed but results are unaltered. Version to appear im American Journal of Physic

Implementación de una herramienta de autogestión y autoconfiguración para la implementación de servicios en proyectos de Big Data

Trabajo de InvestigaciónEste proyecto busca analizar, investigar y facilitar información a los usuarios sobre las actuales herramientas gratuitas, que permiten la autogestión, autoconfiguración de la infraestructura y el manejo de datos en proyectos orientados a Big Data. Para llevar a cabo este proyecto se establece una metodología en cuatro fases y posteriormente se diseña el mecanismo a implementar, basándose en las arquitecturas Zeta, Kappa y Lambda; haciendo uso de ocho herramientas seleccionadas que se administran a través de Chef Server.1. INTRODUCCIÓN. 2. GENERALIDADES. 3. OBJETIVOS DEL PROYECTO. 4. MARCO DE REFERENCIA. 5. METODOLOGÍA 6. DESARROLLO DEL PROYECTO. 7. ENTREGABLES DEL PROYECTO 8. CONCLUSIONES 9. RECOMENDACIONES 10. TRABAJOS FUTUROS 11. BIBLIOGRAFÍA 12. ANEXOSPregradoIngeniero de Sistema

On the Substitution of Identicals in Counterfactual Reasoning

It is widely held that counterfactuals, unlike attitude ascriptions, preserve the referential transparency of their constituents, i.e., that counterfactuals validate the substitution of identicals when their constituents do. The only putative counterexamples in the literature come from counterpossibles, i.e., counterfactuals with impossible antecedents. Advocates of counterpossibilism, i.e., the view that counterpossibles are not all vacuous, argue that counterpossibles can generate referential opacity. But in order to explain why most substitution inferences into counterfactuals seem valid, counterpossibilists also often maintain that counterfactuals with possible antecedents are transparency‐preserving. I argue that if counterpossibles can generate opacity, then so can ordinary counterfactuals with possible antecedents. Utilizing an analogy between counterfactuals and attitude ascriptions, I provide a counterpossibilist‐friendly explanation for the apparent validity of substitution inferences into counterfactuals. I conclude by suggesting that the debate over counterpossibles is closely tied to questions concerning the extent to which counterfactuals are more like attitude ascriptions and epistemic operators than previously recognized

Efecto antibacteriano in vitro del syzygium aromaticum "clavo de olor" y origanum vulgare "orégano" frente a streptococcus muntans atcc 25175

Evaluar el efecto antibacteriano in vitro del syzygium aromaticum “clavo de olor” y origanum vulgare “orégano” frente al streptococcus mutans ATCC 25175. Material y método: El presente estudio de corte transversal, comparativo, se realizó mediante el método de difusión en agar con disco de Kirby – Bauer para evaluar la sensibilidad bacteriana. Se obtuvieron aceites esenciales de orégano y clavo de olor de la empresa de aromaterapia Ekala, ambos a una concentración del 100%. Asimismo, se consiguió la cepa de Streptococcus mutans ATCC 25175 del laboratorio GenLab del Perú Sac; donde cada cepa se cultivó en placas Petri en agar Müller Hinton y se colocaron discos de papel filtro embebidos con aceites esenciales de clavo de olor y orégano a una concentración del 100% cada una. Estos aceites esenciales fueron comparados con Gluconato de clorhexidina al 0.12% como grupo control. Posteriormente, se incubaron a 37° C por 24 horas, para luego realizar la medición del diámetro del halo de inhibición. Para la confiabilidad de este estudio, se utilizó el método estadístico Kappa. Para el análisis de resultados se empleó el programa estadístico SPSS versión 23 y Excel, para luego presentar los resultados en tablas y gráficos. Resultados: Al evaluar el efecto antibacteriano in vitro del Syzygium aromaticum “clavo de olor” y Origanum vulgare “orégano” frente al Streptococcus mutans ATCC 25175, se observó que el halo de inhibición del Syzygium aromaticum (100%) tuvo un promedio de 20.09 mm ± 1.87mm, mientras que el halo de inhibición del Origanum vulgare tuvo un promedio de 14.74 mm ± 0.41. Conclusiones: Se concluye que el mayor promedio fue del Syzygium aromaticum (100%) con un halo de 20.09mm y el menor promedio fue para el Gluconato de Clorhexidina (0,12%) con un halo de 10.63mm.To evaluate the in vitro antibacterial effect of Syzygium aromaticum “clove” and Origanum vulgare “oregano” against Streptococcus mutans ATCC 25175. Material and method: This comparative cross-sectional study was carried out using the Kirby-Bauer disc agar diffusion method to evaluate bacterial sensitivity. Essential oils of oregano and clove were obtained from the aromatherapy company Ekala, both at a concentration of 100%. Likewise, the Streptococcus mutans ATCC 25175 strain was obtained from the GenLab laboratory in Peru Sac; where each strain was grown in Petri dishes in Müller Hinton agar and filter paper discs embedded with essential oils of clove and oregano were placed at a concentration of 100% each. These essential oils were compared with 0.12% chlorhexidine gluconate as a control group. Subsequently, they were incubated at 37 ° C for 24 hours, and then measured the diameter of the inhibition halo. For the reliabil ity of this study, the Kappa statistical method was used. For the analysis of results, the statistical program SPSS version 23 and Excel was used, to then present the results in tables and graphs. Results: When evaluating the in vitro antibacterial effect of Syzygium aromaticum ""clove"" and Origanum vulgare ""oregano"" against Streptococcus mutans ATCC 25175, it was observed that the inhibition halo of Syzygium aromaticum (100%) had an average of 20.09 mm ± 1.87 mm, while the origanum vulgare inhibition halo averaged 14.74 mm ± 0.41. Conclusions: It is concluded that the highest average was Syzygium aromaticum (100%) with a halo of 20.09mm and the lowest average was for Chlorhexidine Gluconate (0.12%) with a halo of 10.63mm.Tesi

Electrostatic internal energy using the method of images

For several configurations of charges in the presence of conductors, the method of images permits us to obtain some observables associated with such a configuration by replacing the conductors with some image charges. However, simple inspection shows that the potential energy associated with both systems does not coincide. Nevertheless, it can be shown that for a system of a grounded or neutral conductor and a distribution of charges outside, the external potential energy associated with the real charge distribution embedded in the field generated by the set of image charges is twice the value of the internal potential energy associated with the original system. This assertion is valid for any size and shape of the conductor, and regardless of the configuration of images required. In addition, even in the case in which the conductor is not grounded nor neutral, it is still possible to calculate the internal potential energy of the original configuration through the method of images. These results show that the method of images could also be useful for calculations of the internal potential energy of the original system.Comment: 5 pages, 3 figures. New discussions added. Minor change