Public Articles
Leaf litter density and decomposition in small man-made ponds
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The input of terrestrial leaf litter into freshwater ecosystems supports aquatic food webs and fuels microbial metabolism. Although the role of leaf litter subsidies to streams have been studied extensively the effect of leaf litter on ecosystem function in lentic systems has received less attention. In particular the impact of leaf litter on trophic dynamics and biogeochemistry of small man-made ponds is virtually unknown, despite the fact that these systems are extremely common and likely represent a substantial modification to watersheds in the North America. We measured the areal density of leaf litter and the rate of leaf litter decomposition in small man–made ponds in central Virginia to determine the size of the leaf litter pool in these systems, the rate at which leaf litter is decomposed, and the extent to which pond characteristics alter leaf litter abundance or processing. We found that the areal density of leaf litter in the ponds ranged between 3.4 and 1179.0 g AFDM m-2. The areal density of leaf litter was significantly greater in the littoral zones, however leaf litter was present in the sediments throughout the pond. There was no relationship between the areal density of leaf litter in the sediments and the percent organic matter of the fine sediments, suggesting that leaf litter input is decoupled from bulk sediment organic matter. The decomposition rate of Liriodendron tulipifera leaves in coarse mesh leaf bags ranged between 0.0025 and 0.0035 d-1, which is among the slowest litter decomposition rates recorded in the literature for ponds and was unrelated to pond characteristics. Our results indicate that leaf litter is an abundant and persistent pool of organic matter in the sediments of small man–made ponds and it is likely to have a substantial effect on the trophic dynamics and biogeochemistry of these systems.
old version
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FPGA on musical contexts: a faster way to understand musicians movements
Laguerre Series: Functions in a Basis of Laguerre Polynomials
I show how to express functions with a known series expansion in terms of Laguerre polynomials.
We have the integral representation of the Laguerre polynomials, \begin{equation} L_n(z)= \frac{e^z}{n!}\int_0^\infty e^{-t}t^n J_0(2\sqrt{ t z})\;dt, \end{equation} where J0(x) is a modified Bessel function, as given on the Wolfram Functions website. If we have a function f(x) that admits a series representation \begin{equation} f(x)=\sum_{k=0}^\infty a_k x^k, \end{equation} with some coefficients ak, then we can define a transform on L[f] \begin{equation} F(s)=L[f(x)]=\int_0^\infty K(x,s)f(x)\;dx. \end{equation} If we pick the kernel function to be \begin{equation} K(x,s)= e^{-x}J_0(2\sqrt{xs}), \end{equation} then we have \begin{equation} F(s) = \sum_{k=0}^\infty a_k\int_0^\infty e^{-x}J_0(2\sqrt{xs})x^k \; dx = \sum_{k=0}^\infty \frac{a_k k!}{e^s}L_k(s), \end{equation} which is an expansion of the transformed function F(s) in terms of Laguerre polynomials. As an example, if f(x)=1, then ak = [k = 0], this gives \begin{equation} \int_0^\infty e^{-x}J_0(2\sqrt{xs})\;dx = \sum_{k=0}^\infty \frac{[k=0]k!}{e^s}L_k(s) = \frac{L_0(s)}{e^s} = e^{-s} \end{equation} this leads to an infinitely recursive integral \begin{equation} e^{-s} = \int_0^\infty \int_0^\infty \int_0^\infty \cdots \int_0^\infty e^{-x_n}J_0(2\sqrt{x_n x_{n-1}})\;dx_n \cdots J_0(2\sqrt{x_3x_2})\;dx_3J_0(2\sqrt{x_2x_1})\;dx_2J_0(2\sqrt{x_1s})\;dx_1 \end{equation} this should also lead to the set of results \begin{equation} e^{-s} = \int_0^\infty e^{x_1}J_0(2\sqrt{x_1 s})\;dx_1 \end{equation} \begin{equation} e^{-s} = \int_0^\infty\int_0^\infty e^{x_2}J_0(2\sqrt{x_2x_1})J_0(2\sqrt{x_1 s})\;dx_1dx_2 \end{equation} \begin{equation} e^{-s} = \int_0^\infty\int_0^\infty\int_0^\infty e^{x_3}J_0(2\sqrt{x_3x_2})J_0(2\sqrt{x_2x_1})J_0(2\sqrt{x_1 s})\;dx_1dx_2dx_3 \end{equation} and so on.
If we formally define a function \begin{equation} f(x) = \sum_{k=0}^\infty \frac{x^k}{e k!k!} = \frac{1}{e} I_0(2\sqrt{x}) \end{equation} we end up with a series expansion for F(s), starting \begin{equation} F(s) = 1 - 2s + \frac{7}{4}s^2 - \frac{17}{18}s^3 + \frac{209}{576}s^4 - \frac{773}{7200}s^5 + \cdots \end{equation}
It seems the inverse kernel is given by \begin{equation} K^{-1}(x,s) = \sum_{i=0}^\infty \sum_{j=0}^i \frac{(-1)^j s^j x^i}{(i-j)!j!j!} = \sum_{i=0}^\infty \frac{x^i}{i!}L_i(s) \end{equation} such that \begin{equation} f(x) = \int_0^\infty K^{-1}(x,s)F(s)\;ds \end{equation}
Notes
Создание системы ледовой разведки на основе роя БПЛА.
Experimental and Numerical Evaluation of Compressive Membrane Action in in-plane restrained concrete slabs
The Inchanted hallway.
Lecture notes on an Environmental Health Risk Assessment of Arsenic in Drinking Water for Diabetes
Derechos políticos Colombianos
Historia;El origen del proceso constitucional en Colombia, duro cuarenta años desde lo antiestatucional que se inició en 1781 con la Revolución de los Comuneros, hasta lo preconstitucional de la Revolución de Independencia en 1810, y posteriormente con la Constitución de 1821, por lo cual no fue un acto instantáneo sino sucesivo. El Estado Federal y Republicano que inició en 1810 dio comienzo a un proceso preconstituyente, cuyas ideas revolucionarias fueron sembradas no solo por algunos monarcómacos(Revolucionarios contra el absolutismo real) y teólogos escolásticos (Reveladores religiosos del cristianismo) del siglo XVI, sino por el movimiento revolucionario de la burguesía que pensó en el pueblo para luchar contra el feudalismo .Dentro de éste contexto, el primer momento de aproximación del pueblo granadino al proceso histórico de evolución del constitucionalismo moderno se presentó con el Acta del Cabildo extraordinario del 20 de julio de 1810.Posteriormente, el Acta de Confederación de las Provincias Unidas de la Nueva Granada representó un segundo intento de integración nacional y una aproximación a la corriente del constitucionalismo, hacia la construcción del auténtico Estado Granadino.Los derechos políticos constituyen aquellos que históricamente fueron las primeras reivindicaciones que realiza el individuo frente al poder absoluto del Estado para asegurar su libertad e igualdad.los derechos políticos se basan en la igualdad que pretende el ser humano le sea reconocida para participar en la vida del Estado, y en las decisiones que le incumben, por ejemplo los derechos de elegir y ser elegido.La consagración de muchos de éstos derechos en los documentos constitucionales de Colombia durante la época de independencia y estructuración nacional, recibió una importante influencia de experiencias independentistas de Estados Unidos de Norteamérica, y de algunos países europeos, como es el caso de Francia. Los derechos civiles y políticos que se analizarán fueron primigeniamente ( originariamente) positivizados en la Declaración del Buen Pueblo de Virginia de 1776 y en la Declaración Francesa de 1789.Constituciones politicas historicamente en Colombia
Exploring effectiveness of Spatial Sampling Strategies in Gridded Population Modeling
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LF/HF HRV: The 'Life After Death' Of A Theory
Test GitHub connection
It is often very useful to edit a document offline, for example in a plane, or if you want to think your changes through and you don't want to make them visible to your collaborators as you type. In that case, we can use Authorea and GitHub together. These are the steps for setting this up:
As you can see when you look into the history of my repository, as I type, changes are pushed to GitHub. The history is not very useful to review in this case since it pushes really small changes very often. It also must be said, I had problems in the beginning to set up this connection, because Authorea was complaining about merge conflicts, but that was later resolved, probably by creating a file in the repository.
Generally, the GitHub integration with Overleaf is much smoother, so for LaTeX project I would use Overleaf.
5. Eplanete pour la construction de la dette écologique
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COMP 330 Syllabus: Software Engineering
Students learn real-world theory and techniques organizations use to create high-quality software on time. Students work on a large programming team to create plans, review progress, measure quality, and make written and oral analyses of their project.
This matches the description at
http://courses.cs.luc.edu/html/comp330.html, which is the department's official Course Handbook.
Hydrogen or Syngas? Cost and Sustainability Considerations for Solar Thermochemical Fuels and their Feedstocks
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Valence - Quantifying GCMS Data
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The GCMS methods in valence are intended to simplify the importation, quantification and reporting for GCMS data presented in its native format (e.g. .ms
). The following is an example of how to import data generated on an Agilent GCMS with a MS/TIC detector.
Resumen
Quantifying and Classifying Australian Aviation Safety Metrics Using Large Volume Track Data - ANU TechLauncher Report
and 5 collaborators
With an increase in air traffic, risk assessment of an air space is becoming a complex and computationally heavy problem. The project aims to take a novel approach to make the job of an air traffic controller easier and the air space safer by making risk assessment efficient and informative.
To achieve this, we are going to build a library which will be utilized by Airservices Australia in their proposed system :
The library will consist of functions capable of accomplishing the following tasks :
Apply pattern recognition and clustering on the flight tracks to classify them into logical groups, so that air controller can see the bigger picture.
Analyze the complexity of given airspace to help air controllers decide if they need more people working on that airspace, to avoid overload. (which reduces the risk of an airspace)
Predict the possibility of a risk (risk value) associated with a specific time and place to help air traffic controller identify and prevent collisions.
Visualize the risk values to provide a meaningful view into an airspace and easily identify greatest areas of risk.
To sum it up, we together with the air traffic controllers are building a safer airspace over our head.
Aplicación Móvil para envío de alertas desde un dispositivo de sensores de amperaje para conocer eventos de una subestación móvil eléctrica.
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Lab #1: UNIX Shell Commands
OK SO ,
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HCA
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