Quantum Dot Behavior in Graphene Nanoconstrictions

Graphene nanoribbons display an imperfectly understood transport gap. We measure transport through nanoribbon devices of several lengths. In long (≥250 nm) nanoribbons we observe transport through multiple quantum dots in series, while shorter (≤60 nm) constrictions display behavior characteristic of single and double quantum dots. New measurements indicate that dot size may scale with constriction width. We propose a model where transport occurs through quantum dots that are nucleated by background disorder potential in the presence of a confinement gap.

Himno Universitario UCV

Fue fundado en 1.943 por Antonio Estévez, y declarado "Patrimonio Artístico de la Nación" en 1983. Es pionero de las agrupaciones corales universitarias venezolanas. Es el coro activo mas antiguo del país y desde su creación ha desarrollado una intensa actividad que lo ha llevado a los más apartados rincones de Venezuela y del mundo. Por otra parte cultiva todo género musical: universal, latinoamericano y venezolano. Ha grabado 10 ediciones discográficas y además ha participado en producciones de artistas nacionales, entre los que cuentan Ilan Chester, Serenata Guayanesa y las Voces Risueñas de Carayaca. Sus integrante son estudiantes, y estudiantes de la UCV.

A 'Theory of Everything' Is Just an Illusion

Nobody knows what "time" is, how to define it, so how can people speak of the beginning of the universe, of the beginning of time, and of the end of the universe. Such talk is completely futile, maybe there is no beginning and no end of time, nobody knows.

A new connection between electricity and magnetism

A magnetic domain wall moving along a ferromagnetic wire can generate a voltage across the wire. This electromotive force, which is not the same as Faraday’s law of induction, is part of a growing family of interactions that are being discovered in the field of spintronics.

Javascript: A Set of Animated Examples

5 Things YOU Can Do to Help Open Source

The thing is that when you tell someone about participation in a certain open source project they immediately think of programming, and they say “Hey I’m no geek dude, I can’t do [insert programming language here], there’s no way I can contribute to this project , even though I’d like to.

Enemies of GNU/Linux?

If you have been following the news last week, you may have stumbled upon a quite shocking news item. A teacher from Austin, Texas confiscated a bunch of CDs containing free Linux distributions from a student who was demonstarting GNU/Linux on his laptop and handing out the CDs. After this, the teacher sent an angry email to Ken Starks of the HeliOS Project, where the student got his Linux CDs from.

Top 10 Responses to Why Should I Use Linux? - A Linux Evangelists’ Reference

If you’re a Linux enthusiast like me, you’ve probably tried to convert a few people over to Linux from another operating system. Even though you succeed many times, there are always a few ‘geniuses’ out there who need some real persuading to switch over to Linux. So here are some quick and simple things about Linux you can point out to your potential convert.

Ubuntu Desktop Edition

With Ubuntu Desktop Edition you can surf the web, read email, create documents and spreadsheets, edit images and much more. Ubuntu has a fast and easy graphical installer right on the Desktop CD. On a typical computer the installation should take you less than 25 minutes.

Turkey Physics (La Física del Pavo)

As you cook the turkey, muscle fibers contract until they begin to break up at around 180 degrees Fahrenheit. Bonds within the molecules begin to break down, causing proteins to unravel, and the dense muscle meat to become more tender. Collagen in the bird (one of three protein fibers that attaches muscles to the bone) breaks down into softer gelatin molecules as it unwinds.

El aceite de oliva ayuda a prolongar la sensación de saciedad

Ya se sabe desde hace tiempo que es bueno para la salud, pero una nueva investigación encontró una ventaja extra. Las comidas preparadas con este aceite mantienen la sensación de saciedad por más tiempo.

40,000 planets could be home to aliens

Researchers have calculated that up to 37,964 worlds in our galaxy are hospitable enough to be home to creatures at least as intelligent as ourselves.

Natureevents

Natureevents is the first place for scientists looking for the latest scientific conferences, meetings, courses and symposia. We publish the Natureevents directory, which covers a complete range of scientific events and conferences around the world in the current year.

A Christmas Present From Mendelssohn, Delivered at His Birthday Celebration

The Lyric Chamber Music Society of New York began its celebration of Mendelssohn’s 200th birthday last season, when it included a handful of rarities in its programming. It has a few more up its sleeve too, including a reconstruction of an unfinished piano concerto. But for the actual birthday, on Tuesday, the society presented a salon concert of the sort that was common in Mendelssohn’s day, bringing together vocal works and piano music.

Exploding mobile phone kills man in China

The shop worker from Guangzhou, China, died moments after he put a new battery in his phone, it has been claimed. It was believed that he may have just finished charging the battery and had put the phone in his breast pocket when it exploded. China's daily Shin Min Daily News said the accident happened on Friday, Jan 30, at 7.30pm. An employee at the shop told local media that she heard a loud bang and saw her colleague lying on the floor of the shop in a pool of blood. The employee said the victim had recently changed the battery in his mobile phone.

Do Nanoparticles in Food Pose a Health Risk?

Yet, the Washington, D.C.–based environmental group Friends of the Earth (FoE) reports that none of the more than 100 food or food-related products it identified that contain nanoparticles—puny particles between 100 and one nanometers—bears a warning label or has undergone safety testing by government agencies.

Ashley Judd

Defenders Action Fund's campaign to expose Gov. Palin’s anti-wildlife agenda has attracted the support of actress and activist, Ashley Judd.

Ashley Judd: "I am outraged by Sarah Palin's promotion of this cruel, unscientific and senseless practice which has no place in modern America," commented Ms. Judd. "Because she is apparently determined to continue and expand this horrific program, I am grateful that Defenders will aggressively fight to stop her. I am proud to be a part of that effort."

See the Ashley Judd video

Top ten open problems in physics

I think… the ultimate purpose of my work is solving unsolved mysteries in physics. I am afraid, this and only this makes my work enjoyable for me, makes it fun. For the sake of future reference, let me enlist here the most important (from my point of view), hard and interesting unsolved problems in physics.

Chesley (Sully) Sullenberger, hero of US Airways Flight 1549, breaks silence about emergency landing

"It was very quiet as we worked, my co-pilot and I. We were a team," Sullenberger told ESPN's Rick Reilly. "But to have zero thrust coming out of those engines was shocking - the silence."