Evaluación de 3 fuentes de fosforo (DAP, MAP Y Roca fosforica) como enraizante en el cultivo de arroz (Oriza sativa L). Variedad Fedearroz 68 en el Municipio de Piedras – Tolima.

La importancia de realizar este proyecto va enfocada en buscar una solución a un problema de enraizamiento en el cultivo de arroz, debido a que es una problemática de gran importancia a la hora de asegurar las cosechas, puesto que la deficiencia de este elemento ocurre frecuentemente en el cultivo. Se busca verificar la respuesta de la raíz a 3 tratamientos utilizando 3 fuentes de fosforo (DAP, MAP Y Roca fosforica) comparado con un testigo absoluto, los cuales ayudan en la regulación de varias enzimas, así mismo evaluar cuál de estos elementos aporta a un mejor desarrollo radicular, considerando que la raíz es el principal órgano de absorción de los nutrientesThe importance of carrying out this project is focused on finding a solution to a problem of rooting in rice cultivation, because it is a problem of great importance when it comes to ensuring harvests, since the deficiency of this element frequently occurs in the crop. The aim is to verify the response of the root to 3 treatments using 3 sources of phosphorus (DSP, MAP AND Phosphoric rock) compared with an absolute control, which help in the regulation of several enzymes, as well as to evaluate which of these elements contributes to a better root development, considering that the root is the main organ of absorption of nutrients

Infrasound tones at sensation threshold level elicit measurable Frequency-Following responses

Even barely detectable levels of infrasound are often reported to cause annoyance and complaints. We carefully measured the individual sensation threshold of a pure tone and recorded immediately after the brain's frequency-following response (FFR) at this intensity using the same stimulator. In contrast to 87-Hz tones, 8-Hz tones elicit an FFR already at sensation threshold. Control stimuli with trains of 1-kHz tone pips having the repetition rate of the infrasound tone frequency and sensation threshold intensities evoked no significant FFR. Thus, slow periodicity, causing synchronous activation of auditory nuclei, is not explaining the FFR to low-level infrasound alone

Dual-Mode Gold Nanoparticle-Based Method for Early Detection of Acanthamoeba

Acanthamoebakeratitis is an aggressive and rapidly progressing ocular pathology whosemain risk factor is the use of contact lenses. An early and differential diagnosis is considered themain factor to prevent the progression and improve the prognosis of the pathology. However, currentdiagnosis techniques require time, complex and costly materials making an early diagnosis challeng-ing. Thus, there is a need for fast, accessible, and accurate methods forAcanthamoebadetection bypractitioners for timely and suitable treatment and even for contact lens user as preventive diagnosis.Here, we developed a dual-mode colorimetric-based method for fast, visual, and accurate detectionofAcanthamoebausing gold nanoparticles (AuNPs). For this strategy, AuNPs were functionalizedwith thiolated probes and the presence of targetAcanthamoebagenomic sequences, produce a colori-metric change from red to purple. This approach allows the detection of 0.02 and 0.009μM of theunamplifiedAcanthamoebagenome by the naked eye in less than 20 min and by color analysis usinga smartphone. Additionally, real samples were successfully analyzed showing the potential of thetechnology considering the lack of point-of-care tools that are mostly needed.This work was supported by an industrial project (ND2017/BMD7676) granted by the community of Madrid.info:eu-repo/semantics/publishedVersio

Analysis of the influence of the plasma thermodynamic regime in the spectrally resolved and mean radiative opacity calculations of carbon plasmas in a wide range of density and temperature

In this work the spectrally resolved, multigroup and mean radiative opacities of carbon plasmas are calculated for a wide range of plasma conditions which cover situations where corona, local thermodynamic and non-local thermodynamic equilibrium regimes are found. An analysis of the influence of the thermodynamic regime on these magnitudes is also carried out by means of comparisons of the results obtained from collisional-radiative, corona or Saha–Boltzmann equations. All the calculations presented in this work were performed using ABAKO/RAPCAL code

Adherence Evaluation of a MacPherson Suspension under EuSAMA Norm in a Mathematical Model and one Multibody

En este trabajo se realiza una simulación computacional, para dar respuesta a un problema de dinámica asociado a la evaluación de la adhesión en sistemas de suspensión. El proceso inicia con el levantamiento de las geometrías más representativas de un sistema MacPherson de un Nissan Sentra B13, donde cada uno de los dispositivos se crea y ensambla en un software CAD para dar solución dinámica en un paquete CAE multicuerpo. Posteriormente se crea un modelo matemático cuyas ecuaciones diferenciales se generan fundamentadas en la segunda ley de Newton y se resuelven en Simulink de Matlab®. Finalizado el proceso de elaboración de los modelos se alimentan las variables con la información precisa del vehículo de estudio para obtener las gráficas que dan respuesta al protocolo de la prueba EuSAMA (European Shock Absorber Manufaturers Association) para el análisis de la adhesión. Los resultados obtenidos evidencian que los modelos desarrollados son confiables cuando se comparan con la prueba experimental; además, se observa que la disminución del coeficiente de amortiguamiento compromete la adhesión del vehículo en la vía, afectando la estabilidad y maniobrabilidad.A computational simulation is Implemented, in order to response to a problem of dynamics associated With The assessment of adherence in suspension systems. The process begins with the lifting of the most representative geometries of a MacPherson system of a Nissan Sentra B13, where each of the devices is created and assembled into a CAD software to give a dynamic solution on a CAE multibody package. Afterwards a mathematical model was created whose differential equations are generated substantiated on Newton's second law and this are resolved using Matlab-Simulink applications. Once the model developing process is over, the variables are fed with accurate information of the studied vehicle to obtain the graphs that give an answer to EuSAMA (European Shock Absorber Manufacturers Association) test protocol for the adherence analysis. The results presented show the reliability of the developed models when compared with the experimental test; furthermore, it demonstrates that the decrease of the damping coefficient compromises the vehicle´s adherence on the track, affecting its stability and maneuverability

Ambition meets reality:Achieving GHG emission reduction targets in the livestock sector of Latin America

Livestock production is a very relevant source of income and agricultural greenhouse gas (GHG) emissions in Colombia, Brazil, Argentina, Costa Rica, Uruguay, Mexico, and Peru. Several management and technological options with enteric methane mitigation potential have been evaluated and their scaling is anticipated to contribute toward achieving GHG emission reduction targets in the framework of the Paris Agreement. Yet, widespread adoption of promising mitigation options remains limited, raising questions as to whether envisaged emission reduction targets are achievable. Using findings from local studies, we explore the mitigation potentials of technologies and management practices currently proposed to mitigate enteric methane emissions from cattle production systems in the higher emitting countries of Latin America. We then discuss barriers for adopting innovations that significantly reduce cattle-based enteric methane emissions and the major shifts in policy and practice that are needed to raise national ambitions in the high emitting countries. Using the latest science and current thinking, we provide our perspective on an inclusive approach and re-imagine how the academic, research, business and public policy sectors can support and incentivize the changes needed to raise the level of ambition and achieve sustainable development goals (SDG), considering actions from the farm to the national scale

Relativistic screened hydrogenic radial integrals

The computation of dipole matrix elements plays an important role in the study of absorption or emission of radiation by atoms in several fields such as astrophysics or inertial confinement fusion. In this work we obtain closed formulas for the dipole matrix elements of multielectron ions suitable for using in the framework of a Relativistic Screened Hydrogenic Model

Propuesta estratégica de mejora en la implementación de los estándares mínimos del sistema de gestión de la seguridad y salud en el trabajo (SG-SST) en la empresa Prosegur para el primer semestre del 2019.

El documento consiste en un análisis de implementación y propuestas estratégicas sobre las acciones y el plan de mejora del Sistema de Gestión de la Seguridad y la Salud en el Trabajo (SG-SST) en la empresa Prosegur S.A para el primer semestre del 2019.The document consists of an analysis of implementation and strategic proposals on the actions and the improvement plan of the Safety and Health at Work Management System (SG-SST) in the company Prosegur S.A for the first semester of 2019

Parametrization of the average ionization and radiative cooling rates of carbon plasmas in a wide range of density and temperature

In this work we present an analysis of the influence of the thermodynamic regime on the monochromatic emissivity, the radiative power loss and the radiative cooling rate for optically thin carbon plasmas over a wide range of electron temperature and density assuming steady state situations. Furthermore, we propose analytical expressions depending on the electron density and temperature for the average ionization and cooling rate based on polynomial fittings which are valid for the whole range of plasma conditions considered in this work

Analysis of microscopic magnitudes of radiative blast waves launched in xenon clusters with collisional-radiative steady-state simulations

Radiative shock waves play a pivotal role in the transport energy into the stellar medium. This fact has led to many efforts to scale the astrophysical phenomena to accessible laboratory conditions and their study has been highlighted as an area requiring further experimental investigations. Low density material with high atomic mass is suitable to achieve radiative regime, and, therefore, low density xenon gas is commonly used for the medium in which the radiative shocks such as radiative blast waves propagate. In this work, by means of collisional-radiative steady-state calculations, a characterization and an analysis of microscopic magnitudes of laboratory blast waves launched in xenon clusters are made. Thus, for example, the average ionization, the charge state distribution, the cooling time or photon mean free paths are studied. Furthermore, for a particular experiment, the effects of the self-absorption and self-emission in the specific intensity emitted by the shock front and that is going through the radiative precursor are investigated. Finally, for that experiment, since the electron temperature is not measured experimentally, an estimation of this magnitude is made both for the shock shell and the radiative precursor