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Alternativas gratuitas a Simcity.

eliasbrasa - Jue, 12/04/2014 - 11:53

Simcity no es que haya sido uno de mis juegos favoritos, aunque sí que fue el primer juego original que tuve (aunque la copia que compré nunca funcionó porque no reconocía bien la versión de MS-DOS que utilizaba)

Lo que nos trae hasta aquí es que hay alternativas gratuitas que nos pueden servir para quitarnos el mono de jugar a este juego, para ello tenemos tres opciones:

800px-Lincity-ng

- Lincity: La versión GNU original, tiene un sistema muy parecido para jugar al del Simcity original, pero sus gráficos son bastante rudimentarios (o retro como se podría decir ahora) ;) ;) Pero eso nos permite jugar a él en ordenadores muy viejos, ya que no tiene 3D ni nada por el estilo.

- Lincity-ng: Es un fork del juego anterior con los gráficos y sonidos mejorados, aunque no esperes unos efectos espectaculares, de hecho, la resolución del juego es bastante pequeña. Eso sí, permite la lectura de partidas grabadas en Lincity, pero su desarrollo parece ser que se ha congelado debido a la falta de tiempo de sus desarrolladores.

- 3d.city: Esta es la verdadera razón por la que escribo esta entrada, me ha parecido muy curiosa esta iniciativa, como podréis comprobar en este enlace, este juego solo necesita un navegador actualizado, con lo que te ahorras el instalar ningún software, aunque tengo que reconocer que en mi equipo va muy pesado y no merece la pena, pero con el tiempo puede que se transforme en una alternativa viable para nuestro ocio.

Fuentes: Bitelia y Wikipedia.


Fedora 21, release el 9 de Diciembre

Fedora Chile - Jue, 12/04/2014 - 10:55

Recién ha terminado la reunión de Go/No-Go para Fedora 21 y hay ya acuerdo entre los equipos de QA, Release Engineering y Desarrollo.

Fedora 21 estará públicamente disponible el próximo Martes 09 de Diciembre!

Los detalles de la reunión los puedes encontrar acá:
Minuta: http://bit.ly/1yjG357
Log: http://bit.ly/1yjG7SE

Gracias a todos los que participaron en el proceso, este es un GRAN logro luego de casi un año de desarrollo. Ahora a celebrar y a juntar fuerzas para el próximo Release de Fedora!

El anuncio oficial

By Casep!

El gran cambio que va a suponer la telefonía 5G

E-ais - Mié, 12/03/2014 - 21:16
Normal 0 21 false false false ES-VE X-NONE X-NONE e-aisnoreply@blogger.com0

Venezuela arrancará instalación de redes 4G en 2015

E-ais - Mié, 12/03/2014 - 20:58
Normal 0 21 false false false ES-VE X-NONE X-NONE e-aisnoreply@blogger.com0

Simplifica, simplifica y vuelve a simplificar

Jose Salgado - Mié, 12/03/2014 - 18:05

simplifica

La vida es complicada y los negocios no son diferentes, son complicados, tienes proveedores, clientes, personal interno, existen procesos, normas, etc… hay cientos de variables que pueden afectar a tu empresa. Si a esto le sumamos la enorme facilidad que tenemos a día de hoy para recolectar información, nos podemos encontrar con una base de datos tan grande que seremos incapaces de poder sacar conclusiones.

Por eso, al igual que en la vida, has de simplificar. Has de eliminar todo lo superfluo, dejar de lado todo aquello

Esto es un resumen del artículo Simplifica, simplifica y vuelve a simplificar escrito para Exelisis. Visita la web para más información y compártelo si crees que es interesante.

I have found my place within Fedora Project

Neville - Mié, 12/03/2014 - 08:00

As a Fedora Ambassador I should help people find a place to collaborate with the Fedora Project. I have been around for long time doing different things in Fedora Project. I feel that I have failed myself because I did find my place before. I have been doing for so long events, recruiting collaborators and helping people. I failed my self to help me doing things that I really enjoy doing for the project.

FUDCon Managua 2014 was a major challenge and at some points I was considering quit. People like Lila, Cristhian, Samuel and Fernando keep me going. At the same time, Fedora Council was taking shape and FamSCo was starting to change. Probably I was involved in to many things.

Some time ago I was asked if I will keep up with marketing activities. I accepted to be dismiss from Marketing Team. I am not doing anything, it is fair to step aside. It felt right, I can be back any time when I want. Later on I unsubscribe myself from the marketing mailing list as it was no longer related to marketing, but to Fedora Magazine.

I quit to freemedia, I was dealing with membership management which I stepped aside long ago, and recently I quit completely as I haven’t sent media in months. Again, it felt right as I can came back anytime.

The transition from Fedora Board to Fedora Council made me take a choice. Did I wanted to keep in that level of commitment? I honestly I was not following the mailing list and not following the trac. Much of this was because of FUDCon, but also I lack energy.

I really wanted to FAmSCo to change, when that become a reality, then I felt that I did not need to keep involved. Againg I lack energy, motivation or both. So I quit.

Even I have organize 9 Fedora Release Parties in a row. I got a hotdog cart to release Beefy Miracle. I also helped to organize release party in El Salvador, Guatemala and Costa Rica. I am not doing it now. Lila has said to do it, and I am glad to someone else take charge of that.

I came to Fedora because I wanted to have a stable platform for Amateur Radio. I like electronics and experimenting. I needed to ask help and end up helping people. It was a great ride, but it was a side track.

So what I am going to do? I want to thanks Valentin and Icaro Project for helping me find my place in Fedora. I love the electronic experimenting. It is a wonderful project aiming to education, but you can get on board and keep growing and learning with it.

This is what I was looking for. A place to collaborate with something that challenge me to learn things that I want. A thing to talk about and do presentation about things that I am passionate about.

Don’t get me wrong, I love Fedora Project. But I am not passionate about talking about features that I am not using and most of the time I am not fully understand. I did it because I fell it was something to be done.

Since I get in touch with Icaro I am thinking how I going to use Icaro boards with Amateur Radio. Switching equipment, satellite tracking, too many possibilities.

Since FUDCon Managua 2014 I was been asked about robotics. From the science committee of the vice presidency office, from RUPAP degree in system, there is a department of research and development of RUPAP that also asked about, the ministry of education also asked about. I event got a request for a pilot experience with a school. My answer has been, Icaro project will happen in Nicaragua, you can be part of it or just watch it happen.

I have found my place within Fedora.

I have found my place within Fedora Project

Fedora Nicaragua - Mié, 12/03/2014 - 08:00

As a Fedora Ambassador I should help people find a place to collaborate with the Fedora Project. I have been around for long time doing different things in Fedora Project. I feel that I have failed myself because I did find my place before. I have been doing for so long events, recruiting collaborators and helping people. I failed my self to help me doing things that I really enjoy doing for the project.

FUDCon Managua 2014 was a major challenge and at some points I was considering quit. People like Lila, Cristhian, Samuel and Fernando keep me going. At the same time, Fedora Council was taking shape and FamSCo was starting to change. Probably I was involved in to many things.

Some time ago I was asked if I will keep up with marketing activities. I accepted to be dismiss from Marketing Team. I am not doing anything, it is fair to step aside. It felt right, I can be back any time when I want. Later on I unsubscribe myself from the marketing mailing list as it was no longer related to marketing, but to Fedora Magazine.

I quit to freemedia, I was dealing with membership management which I stepped aside long ago, and recently I quit completely as I haven’t sent media in months. Again, it felt right as I can came back anytime.

The transition from Fedora Board to Fedora Council made me take a choice. Did I wanted to keep in that level of commitment? I honestly I was not following the mailing list and not following the trac. Much of this was because of FUDCon, but also I lack energy.

I really wanted to FAmSCo to change, when that become a reality, then I felt that I did not need to keep involved. Againg I lack energy, motivation or both. So I quit.

Even I have organize 9 Fedora Release Parties in a row. I got a hotdog cart to release Beefy Miracle. I also helped to organize release party in El Salvador, Guatemala and Costa Rica. I am not doing it now. Lila has said to do it, and I am glad to someone else take charge of that.

I came to Fedora because I wanted to have a stable platform for Amateur Radio. I like electronics and experimenting. I needed to ask help and end up helping people. It was a great ride, but it was a side track.

So what I am going to do? I want to thanks Valentin and Icaro Project for helping me find my place in Fedora. I love the electronic experimenting. It is a wonderful project aiming to education, but you can get on board and keep growing and learning with it.

This is what I was looking for. A place to collaborate with something that challenge me to learn things that I want. A thing to talk about and do presentation about things that I am passionate about.

Don’t get me wrong, I love Fedora Project. But I am not passionate about talking about features that I am not using and most of the time I am not fully understand. I did it because I fell it was something to be done.

Since I get in touch with Icaro I am thinking how I going to use Icaro boards with Amateur Radio. Switching equipment, satellite tracking, too many possibilities.

Since FUDCon Managua 2014 I was been asked about robotics. From the science committee of the vice presidency office, from RUPAP degree in system, there is a department of research and development of RUPAP that also asked about, the ministry of education also asked about. I event got a request for a pilot experience with a school. My answer has been, Icaro project will happen in Nicaragua, you can be part of it or just watch it happen.

I have found my place within Fedora.

Analiza, ejecuta y corrige

Jose Salgado - Mar, 12/02/2014 - 18:05

planifica

Esta es la frase que inevitablemente tendrás que escuchar cuando acudes a conferencias sobre gestión. Siempre recalcan lo importante de tomarse un tiempo prudencial para analizar y poder tomar las decisiones correctas para luego ejecutar. Claro que esto parece bastante obvio, lo que ocurre es que tendemos a olvidar la última parte: corregir.

Porque parece un verbo normal y corriente pero hay que saber dónde poner el foco. ¿Ha sido un problema de análisis?, ¿un problema de ejecución?, ¿Cómo sabemos cual es cual?,

Esto es un resumen del artículo Analiza, ejecuta y corrige escrito para Exelisis. Visita la web para más información y compártelo si crees que es interesante.

FUDCon Managua 2014 Numbers and Lessons

Neville - Mar, 12/02/2014 - 14:45

I would like to ponder some questions. To do so, there are some background to cover. You can spare with me in all the details or you can go straight to the bottom.

We spent $8,373.38 in air fares for 9 collaborators. Air travel is expensive, and it is more expensive in Latin America. There was the agreement to pay for the visa for the only persona that needed it, it was $50.  We are glad that we have 4 people traveling on their own budget. We end up we a team of 14 including the holder of the fedora scholarship. The expenses of the fedora scholarship are not taken into account, as that comes from another budget.

We spent $912 in food during the event and $ 772 in FUDPub. There was $77 in water and sodas for the team. The FUDPub was over the initial budget because there were more people that were supposed to attend than we estimated for this closure night of FUDCon.

We paid to the university $549.95 that consisted mostly in posters and booklets. The remainder were some minor charges for audio and projectors.

There were some expenses in promotion, like roller up banners and horizontal banners. This added up to $ 342. Part of this was to reciprocate our sponsors.

Lodging was $1895.40 not including those that were paid by the collaborators and also not including the room share of the fedora scholarship holder. This sum was at the discounted price offered for the convention. There was also the use of the meeting room for hacking during the nights that was $130. Transportation was $255 that were accounted for moving people to the university and back to the hotel. There were also some trips to the airport in this sum. Mostly all airport pick up was done personally, so it is not included. Driving people in my car from the hotel to the university was not included. This amount related to transportation does not include two tour trips organized before the event and after the event.

T-shirts cost $ 750. There were some minor cost for a web cam, security cords for laptops, toner for printing schedules that add up to $ 209.45

If you add up all this, you will get the amount of $14,266.18 That’s is what FUDCon Managua 2014 actually cost, at least to what is accountable.

The other part is were the money come from. For start we had the Fedora Premier event budget of $10,000. Then we had Bluehost collaboration of $1,000. Güegüe Comunicaciones paid all t-shirts, $750. Dotora Barreto’s dental clinic, paid part of the FUDPub $315. Monchito.net gave $300 and Sen Comunicaciones helped with other $300. Computer.net gave $160.

We have other sponsorship like Movistar that provided internet bandwidth at the university and Comtech that supplied one web cam and color ink printers used for badgeds, food tickets and other minors colorful printing needs. Those are non quantificable.

In the end we raised the amount of $12,825.00. So, there is a difference of $1,441.18

Mansión Teodolinda gave an extra discount of $229.73 over the lodging invoice, which already had a discount. There was also items that were not charged, like transport for $255 and meeting room use for $130. $77 related to water and sodas that were available at the university was also not charged. There were items that were paid for like banners $342. This makes a contribution of $1033.73. Again, this was an extra help, as the lodging already has a discount price.

We end short by $407.45 that I paid from my pocket. This is quantifiable, but there are non quantifiable expenses about doing errands, calling people, meeting people, and so on. This non quantifiable cost also is shared with the rest of the local team. Lot of time invested. I will not call on the fuel I expend going to the airport, as that was a personal choice as a host. I don’t think the local team will charge for transport fares going and coming for all the errands needed to organize the event.

Having the numbers in black and white, if not meant to show how much I invest in the project. It is not to claim for reimburse. I was absolutely clear during the planning and the execution of the event that my business and I will cover the difference.

My point is to raise the awareness of what doing FUDCon really means. There has been a lot of talks about this, but throw some fact and figures makes clear.

The  budget of $10K is short. We have been talking long about this issue. The reply is that extra money will be given if it is justify. There is no clear definition of how to justify extra budget. Historically, FUDCon LATAM has cost about $15K.

We expect from the local team organize an event and at the same time raise  about $5K in sponsorship? Raise sponsorship is not something expected as expertise of the local team. This is a learning experience that is not transferable as it depends on the local context. Most likely all this work will not generate further benefits for the Project.

After doing all, the local team end being so busy hosting the event that they can not attend the talks and hacks. I am so glad that we agreed to have some of the key people organizing the event lodged in the hotel. At least they get some hacking time at night. Not much, as there was things to get ready for the next day. But it was some time for learning and sharing with the LATAM collaborators.

I have a income from a job, a car and contacts, and I struggled leading the organization of the event. So why doing it? Why a collaborator should want to organize FUDCon? You may get the sense of accomplishment, but where is the fun in it? I will not recommend to any friend to engage in organizing FUDCon in the current terms. There are some concern about loosing collaborators that undergo this challenge.

People worked hard to host the events. For most of them was their first Fedora Premier Event. Yet, they didn’t fully participate of it. They were hosting. They were taking care that things were running smoothly.

What do I think we should do? I do think that we need to clear what the Fedora Project expect as outcome and to provide budget according to objectives. It also means that can be evaluated if it was a success or not. It is need to clarify which may be justified for extra funds. Both side are busy, so a clear guide will help. I do think that people that gave so much time and effort organizing one Fedora Premier Event should be rewarded. Those that had not the opportunity to attend a Fedora Premier Event should be considered to be sponsored for the next event.

FUDCon Managua 2014 Numbers and Lessons

Fedora Nicaragua - Mar, 12/02/2014 - 14:45

I would like to ponder some questions. To do so, there are some background to cover. You can spare with me in all the details or you can go straight to the bottom.

We spent $8,373.38 in air fares for 9 collaborators. Air travel is expensive, and it is more expensive in Latin America. There was the agreement to pay for the visa for the only persona that needed it, it was $50.  We are glad that we have 4 people traveling on their own budget. We end up we a team of 14 including the holder of the fedora scholarship. The expenses of the fedora scholarship are not taken into account, as that comes from another budget.

We spent $912 in food during the event and $ 772 in FUDPub. There was $77 in water and sodas for the team. The FUDPub was over the initial budget because there were more people that were supposed to attend than we estimated for this closure night of FUDCon.

We paid to the university $549.95 that consisted mostly in posters and booklets. The remainder were some minor charges for audio and projectors.

There were some expenses in promotion, like roller up banners and horizontal banners. This added up to $ 342. Part of this was to reciprocate our sponsors.

Lodging was $1895.40 not including those that were paid by the collaborators and also not including the room share of the fedora scholarship holder. This sum was at the discounted price offered for the convention. There was also the use of the meeting room for hacking during the nights that was $130. Transportation was $255 that were accounted for moving people to the university and back to the hotel. There were also some trips to the airport in this sum. Mostly all airport pick up was done personally, so it is not included. Driving people in my car from the hotel to the university was not included. This amount related to transportation does not include two tour trips organized before the event and after the event.

T-shirts cost $ 750. There were some minor cost for a web cam, security cords for laptops, toner for printing schedules that add up to $ 209.45

If you add up all this, you will get the amount of $14,266.18 That’s is what FUDCon Managua 2014 actually cost, at least to what is accountable.

The other part is were the money come from. For start we had the Fedora Premier event budget of $10,000. Then we had Bluehost collaboration of $1,000. Güegüe Comunicaciones paid all t-shirts, $750. Dotora Barreto’s dental clinic, paid part of the FUDPub $315. Monchito.net gave $300 and Sen Comunicaciones helped with other $300. Computer.net gave $160.

We have other sponsorship like Movistar that provided internet bandwidth at the university and Comtech that supplied one web cam and color ink printers used for badgeds, food tickets and other minors colorful printing needs. Those are non quantificable.

In the end we raised the amount of $12,825.00. So, there is a difference of $1,441.18

Mansión Teodolinda gave an extra discount of $229.73 over the lodging invoice, which already had a discount. There was also items that were not charged, like transport for $255 and meeting room use for $130. $77 related to water and sodas that were available at the university was also not charged. There were items that were paid for like banners $342. This makes a contribution of $1033.73. Again, this was an extra help, as the lodging already has a discount price.

We end short by $407.45 that I paid from my pocket. This is quantifiable, but there are non quantifiable expenses about doing errands, calling people, meeting people, and so on. This non quantifiable cost also is shared with the rest of the local team. Lot of time invested. I will not call on the fuel I expend going to the airport, as that was a personal choice as a host. I don’t think the local team will charge for transport fares going and coming for all the errands needed to organize the event.

Having the numbers in black and white, if not meant to show how much I invest in the project. It is not to claim for reimburse. I was absolutely clear during the planning and the execution of the event that my business and I will cover the difference.

My point is to raise the awareness of what doing FUDCon really means. There has been a lot of talks about this, but throw some fact and figures makes clear.

The  budget of $10K is short. We have been talking long about this issue. The reply is that extra money will be given if it is justify. There is no clear definition of how to justify extra budget. Historically, FUDCon LATAM has cost about $15K.

We expect from the local team organize an event and at the same time raise  about $5K in sponsorship? Raise sponsorship is not something expected as expertise of the local team. This is a learning experience that is not transferable as it depends on the local context. Most likely all this work will not generate further benefits for the Project.

After doing all, the local team end being so busy hosting the event that they can not attend the talks and hacks. I am so glad that we agreed to have some of the key people organizing the event lodged in the hotel. At least they get some hacking time at night. Not much, as there was things to get ready for the next day. But it was some time for learning and sharing with the LATAM collaborators.

I have a income from a job, a car and contacts, and I struggled leading the organization of the event. So why doing it? Why a collaborator should want to organize FUDCon? You may get the sense of accomplishment, but where is the fun in it? I will not recommend to any friend to engage in organizing FUDCon in the current terms. There are some concern about loosing collaborators that undergo this challenge.

People worked hard to host the events. For most of them was their first Fedora Premier Event. Yet, they didn’t fully participate of it. They were hosting. They were taking care that things were running smoothly.

What do I think we should do? I do think that we need to clear what the Fedora Project expect as outcome and to provide budget according to objectives. It also means that can be evaluated if it was a success or not. It is need to clarify which may be justified for extra funds. Both side are busy, so a clear guide will help. I do think that people that gave so much time and effort organizing one Fedora Premier Event should be rewarded. Those that had not the opportunity to attend a Fedora Premier Event should be considered to be sponsored for the next event.

Coloración con condiciones

Gaussianos - Mar, 12/02/2014 - 05:00

Os dejo hoy martes el problema de esta semana. Ahí va:

Dado el conjunto N=\{1, 2, \ldots , n-1 \}, con n \geq 3, coloreamos cada uno de sus elementos de blanco o de negro según las siguientes reglas:

  1. i y n-i siempre se colorean del mismo color.
  2. Para algún j \in N primo relativo con n, i y |j-i| se colorean del mismo color para todo i \in N, \, i \ne j.

Demostrar que todos los números del conjunto N deben colorearse con el mismo color.

Que se os dé bien.

Entra en Gaussianos si quieres hacer algún comentario sobre este artículo, consultar entradas anteriores o enviarnos un mensaje.

Construye tú también el poliedro de Császár.

Los bebés no comen solomillo

Jose Salgado - Mar, 12/02/2014 - 03:52

solomillo

No voy a negarlo, un buen solomillo con unas patatas fritas es algo por los que muchos adultos nos ahogaríamos en nuestros propios jugos, pero cuando se trata de alimentar a un recién nacido no es la mejor alternativa para cenar. Hemos de dejar nuestras propias preferencias y sumergirnos en un mundo lleno de leche con cereales varios, algunos sin lactosa, otros con aditivos para evitar cólicos, en resumen, una gama tan rica en opciones como desagradable a nuestro paladar.

Con las empresas ocurre lo mismo cuando buscamos

Esto es un resumen del artículo Los bebés no comen solomillo escrito para Exelisis. Visita la web para más información y compártelo si crees que es interesante.

1er #EncuentroTIC2014 y 3 era Tecnoferias toma al Centro Cultural Simón Bolívar este 2 diciembre

E-ais - Lun, 12/01/2014 - 12:10
El Centro Cultural Simón Bolívar, San Juan de los Morros, estado Guárico, se realizará la primera edición  del  #EncuentroTIC2014 y la tercera Tecnoferias dedicada a los amantes,  profesionales y estudiantes  de Sistemas e Informática  e Informática en salud  y Comunicación social. Allí, los asistentes podrán disfrutar de ponencias demostraciones de  productos de software entre otros. Invitamose-aisnoreply@blogger.com0

La semana que viene hablaremos del gobierno

Jose Salgado - Dom, 11/30/2014 - 18:05

tip-y-coll

Llevo ya un tiempo escuchando, y muchas veces sufriendo, el nivel de tensión que existe acerca de la política, los políticos y sus áreas de influencia. Horas y más horas de medios consumidas sobre detalles, algunos pequeños otros más grandes, y el caso es que escuche la emisora que escuche es un diálogo de sordos. Simplemente se intenta desacreditar al contrario antes que hacer valer la lógica y la consistencia de las propias ideas.

Hoy, y sin que sirva de precedente, voy a dejar mi punto de vista sobre lo que

Esto es un resumen del artículo La semana que viene hablaremos del gobierno escrito para Exelisis. Visita la web para más información y compártelo si crees que es interesante.

No te olvides de poner el WHERE en el DELETE FROM

Skatox - Dom, 11/30/2014 - 09:30

Ya tengo mucho tiempo que no agrego nuevo contenido a mi sección de Música Geek y recordando que hace unos meses, un conocido borró los datos de una tabla en la base de datos al olvidar colocar el criterio para eliminar la información, por eso, les dejo ésta canción para que no olviden colocar el WHERE al usar el DELETE FROM.

Las ventas en internet por el “viernes negro” crecen más de 20 %

E-ais - Sáb, 11/29/2014 - 19:40
Las ventas realizadas a través de internet en el “viernes negro” (“black Friday”) en Estados Unidos crecieron este año más de un 20 % respecto a 2103, según informes sobre comercio electrónico de las empresas Adobe, ChannelAdvisor y Custora divulgados hoy. El “viernes negro”, que da inicio a las rebajas y a la mayor temporada de consumo del año, ha visto durante los últimos tiempos cómo e-aisnoreply@blogger.com0

¿Quién es el profesor de matemáticas más exitoso de Latinoamérica?

E-ais - Sáb, 11/29/2014 - 12:56
Julio Alberto Ríos, un profesor colombiano conocido como Julioprofe, produce videos de matemáticas que han sido vistos más veces que los de universidades americanas como Harvard y MIT. e-aisnoreply@blogger.com0

¿Que es el Registro Nacional de Innovación e Investigación (RNII) ?

E-ais - Vie, 11/28/2014 - 11:17
El RNII es un sistema automatizado que permite registrar los datos fundamentales de todas aquellas personas e instituciones que realizan actividades de innovación e investigación, en la República Bolivariana de Venezuela. De acuerdo al Artículo 110 de la Constitución de la República Bolivariana de Venezuela: "El Estado reconocerá el interés público de la ciencia, la tecnología, el e-aisnoreply@blogger.com0

Ringed! El adictivo juego creado por emprendedores venezolanos

E-ais - Vie, 11/28/2014 - 11:06
(VA).- Ringed! Es un video juego casual basado en el juguete clásico “Water Ring Toss” desarrollado en Japón en los años 70’s. El juego utiliza los sensores de movimiento de tu móvil junto con simulaciones de física para recrear la experiencia de tener el juguete real en tus manos de una forma moderna, divertida y excitante, que adultos y niños disfrutarán de igual manera. El juego ofrece e-aisnoreply@blogger.com0

Alberto Enciso y Daniel Peralta-Salas demuestran una conjetura de Lord Kelvin de hace 140 años

Gaussianos - Vie, 11/28/2014 - 05:30

Los físicos españoles Alberto Enciso y Daniel Peralta-Salas, investigadores del ICMAT, han resuelto una importante conjetura sobre fluidos que había propuesto Lord Kelvin hace 140 años. Os dejo parte del texto de la nota de prensa del ICMAT sobre el tema (las negritas son mías):

Dos investigadores del Instituto de Ciencias Matemáticas (ICMAT), Alberto Enciso y Daniel Peralta Salas, han resuelto un importante enigma matemático que desafiaba a la comunidad científica desde hace 140 años. El problema fue planteado en 1875 por físico escocés Lord Kelvin (creador, entre muchas otras cosas, de la escala de temperatura Kelvin) como camino para entender la estructura atómica de la materia. Conjeturó que en los fluidos estacionarios podrían aparecer tubos anudados, lo que aplicaba para explicar la composición de la materia, que estaría formada por estructuras en forma de lazo (los átomos) que flotaban en el éter. Los diferentes tipos de átomos venían determinados por variaciones en la geometría de los nudos.

Pese a que la concepción de Kelvin era errónea, las estructuras que imaginó sí se corresponden con la configuración de la materia fluida. Esto es lo que prueba, matemáticamente, el resultado de Peralta y Salas: los fluidos en equilibrio, como el agua que fluye constante por una cañería, a los que se les supondría un comportamiento simple, pueden esconder estructuras en forma de donut retorcido de manera compleja. Estas formas, conocidas como tubos de vorticidad anudados, se relacionan además con la turbulencia.

El problema de Kelvin aparece en el estudio de fluidos turbulentos y de los campos magnéticos responsables de las fulguraciones de las estrellas. “En la superficie del Sol aparecen lenguas de plasma en forma de arcos, que son tubos de vorticidad”, señalan Enciso y Peralta. “Los físicos ya habían observado estos fenómenos, pero nosotros hemos aportado información sólida: hemos probado ahora que matemáticamente son posibles”, afirman los investigadores.

El primero en identificar estas estructuras fue el físico James Maxwell en el siglo XIX, pero no fue hasta el año pasado cuando se obtuvieron resultados experimentales precisos. En el laboratorio Irvine del Instituto James Frank de la Universidad de Chicago consiguieron reproducir estas estructuras complejas en fluidos, lo que supone una confirmación experimental del trabajo de Peralta y Salas.

Para dar con la codiciada solución, los autores han desarrollado nuevas herramientas adaptadas a las dificultades del problema. “Es una demostración muy sofisticada y ha requerido un detallado análisis de las ecuaciones de la mecánica de fluidos; son conceptos en los que hemos trabajado durante los últimos 10 años”, declaran. La novedad de las ideas empleadas en su prueba ha prolongado el proceso de verificación durante dos años, y ha requerido del esfuerzo de prestigiosos expertos. El pasado mes de octubre fue aceptado por la prestigiosa revista Acta Mathematica, publicada por el Instituto Mittag-Leffler de la Real Academia de Ciencias de Suecia. Los expertos consideran el resultado, aceptado por la revista Acta Mathematica, como el más importante de toda la historia de la geometría de los fluidos.

Desde un punto de vista teórico el resultado ayuda a entender las ecuaciones que describen el comportamiento del fluido y de su complejidad. Además, Enciso y Peralta señalan: “Esta cuestión ha ejercido una profunda influencia en varias áreas de las matemáticas puras; ha impulsado el desarrollo de la llamada Teoría de Nudos”.

El preprint, colgado en arXiv, es Existence of knotted vortex tubes in steady Euler flows. El artículo final, como puede leerse en la nota de prensa, ya ha sido aceptado para su publicación en Acta Mathematica, revista publicada por el Instituto Mittag-Leffler de la Real Academia de Ciencias de Suecia.

Es interesante recordar que Alberto y Daniel también resolvieron hace tres años una conjetura sobre dinámica de fluidos planteada hace más de medio siglo. Lo anunciábamos en este post, y más tarde teníamos el honor de publicar una colaboración en la que nos hablaban del problema y de su resolución. Por cierto, en aquellas entradas me refería a ellos como “matemáticos”. En realidad son físicos, pero los dos son doctorados en Física Matemática, por lo que tampoco creo que sea erróneo llamarlos matemáticos.

Y no quiero dejar pasar esta oportunidad para dejaros algunos enlaces a artículos del blog en el que otros matemáticos españoles nos contaban cosas sobre algunos de los logros que han conseguido en los últimos años:

Esta entrada participa en la Edición 5.8: Betty Scott del Carnaval de Matemáticas, que en esta ocasión organiza Tocamates.

Entra en Gaussianos si quieres hacer algún comentario sobre este artículo, consultar entradas anteriores o enviarnos un mensaje.

Construye tú también el poliedro de Császár.

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