Where were you in your last dream? Were you in a forest, a city or a
school? Photographer David Nemcsik asked this interesting question to
his friends for his series, titled the Levitation Project.
Created for an entrance exam at his university, the project takes us all
over Hungary as Nemcsik finds backgrounds that match his friends'
"I'd like to show that people can levitate," he tells us. "It's
magical and mysterious. They are levitating in a lying position just as
if you'd be if you were lying in your bed while you were sleeping." Read more.
Os astrónomos utilizaram três telescópios nos observatórios do ESO, no
Chile, para observar o planeta anão Makemake, no momento em que este
passou em frente a uma estrela distante, bloqueando assim a radiação
emitida pela estrela. As novas observações permitiram verificar pela
primeira vez se o planeta se encontra rodeado por uma atmosfera. Este
mundo frígido tem uma órbita que o leva ao Sistema Solar exterior e
pensava-se que teria uma atmosfera como a de Plutão (eso0908).
No entanto, verificou-se agora que tal não é o caso. Os cientistas
mediram também pela primeira vez a densidade de Makemake. Os novos
resultados serão publicados na revista Nature a 22 de novembro de 2012. Ler mais.
structure of brick or stone to protect the bird and store heat, as well
as the possibility of placing your turkey offset from the main stream
(unless you want to solve the problem of distributing bits of cooked
turkey to a broadly dispersed audience as quickly as possible.)
1. Get the turkey in the protective box. 2. Fire the rocket engine for 1:45 hours. That's it. More recipes.
NASA’s Spot the Station service sends you an email or text message a few hours before the space station passes over your house.
The space station looks like a fast-moving plane in the sky, though one
with people living and working aboard it more than 200 miles above the
ground. It is best viewed on clear nights. For more information on the
International Space Station and its mission, visit the space station mission pages. Read more.
Combining microfabrication techniques with modern tissue engineering,
lung-on-a-chip offers a new in vitro approach to drug screening by
mimicking the complicated mechanical and biochemical behaviors of a
human lung.Read more.
When Felix Baumgartner dove out of a capsule head first
at the edge of space over 24 miles above Earth, he didn’t just have
technology helping him break the world record, he had science on his
Those simulations can look like these from SolidWorks,
using sophisticated software that not only takes into account all the
mathematical probabilities of a jump that high, but also show, in vivid
detail, the physics and the physical forces that are working on his body
as he plummets earthward. Using these simulations before his jump
proves why Felix had to stay in a head down position in order to break
the sound barrier.
The full article
by Dr. Stephen Endersby from SolidWorks gives all the math and
equations involved, but the basic problem was which would come first,
the sound barrier or terminal velocity? Taking the opposing forces on
Felix’s body — the accelerating force vs. the retarding drag — Dr.
Endersby found that at 25 seconds of free fall from a height of 120,000
feet, Felix would still be accelerating. Read more.
Labelled ‘Planet Hunters 1′ (or PH1) in a paper released today
and submitted to the Astrophysical Journal, it is the first planet in a
four-star system. It is a circumbinary planet – one which orbits a
double star – and our follow-up observations indicate that there is a
second pair of stars approximately 90 billion miles (1000 Astronomical
Units) away which are gravitationally bound to the system.Read more.
Chemist Sven Hovmöller of Stockholm University had been trying for nearly
a decade to determine the structures of materials known as
quasicrystals and their nearly identical approximants.
Since their discovery in the lab, physicists had been working tirelessly
to better understand the structure of quasicrystals. But because the
existence of such materials was doubted for so long, computer programs
currently used to interpret imaging data aren’t equipped to analyze the
Then, last summer, he had a seemingly off-the-wall idea. He’d enlist the aid of his 10-year-old son, Linus. “I thought, He’s a smart guy; maybe he could help me,” Hovmöller says.
father-and-son team sat at the kitchen table for 2 days, poring over
the dozens of electron microscopy images Döblinger had generated, as
well as some X-ray diffraction data, which provides more precise
information on the materials’ atomic positions.
Hovmöller would explain
to Linus what he was thinking about how the images all fit together, and
when Linus didn’t understand something, he’d interrupt his father to
ask. This made Hovmöller realize that he was rushing to conclusions.
When he slowed down to clear up Linus’s confusion, he’d get new ideas.
“In 2 days, we solved four new structures.” Read more.
Um modelo que permite determinar a correção
individualizada e adequada de cada olho humano está a ser desenvolvido
por três cientistas portugueses, que viram o resultado do seu estudo
publicado numa revista especializada norte-americana.
O objetivo é conseguir um modelo que permita encontrar
uma "solução personalizada para cada doente, indo ao encontro das suas
necessidades", disse à agência Lusa a médica oftalmologista Filomena
Ribeiro, um dos elementos da equipa. São também autores do trabalho, publicado na revista online PLoS ONE, o
oftalmologista António Castanheira-Dinis, da Faculdade de Medicina da
Universidade de Lisboa, e o físico de Instituto Superior Técnico e
especialista em ótica João Dias. Ler mais.
Yale researchers have discovered that a rocky super-Earth orbiting a nearby star is a diamond planet. “This is our first glimpse of a rocky world with a fundamentally
different chemistry from Earth,” said Dr Nikku Madhusudhan, a Yale
researcher in physics and astronomy and lead author of a paper to be
published in the Astrophysical Journal Letters (arXiv.org version).
“The surface of this planet is likely covered in graphite and diamond rather than water and granite.”
The planet, called 55 Cancri e, has a radius twice Earth’s, and a
mass eight times greater, making it a so-called super-Earth. It is one
of five planets orbiting a sun-like star, 55 Cancri, that is located 40
light years from Earth yet visible to the naked eye in the constellation
of Cancer. The planet orbits at hyper speed – its year lasts just 18
hours, in contrast to Earth’s 365 days. It is also blazingly hot, with a
temperature of about 3,900 degrees Fahrenheit, researchers said, a far
cry from a habitable world. Read more.
The Nobel Prize in Physics 2012 was awarded jointly to Serge Haroche and David J. Wineland "for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems".
How do magnets affect things at a distance? How does the Sun heat our
planet from 93 million miles away? How can we send messages across the
world with our cell phones? We take these seemingly simple things for
granted, but in fact there was a time not too long ago when the
processes behind them were poorly understood, if at all… and, to the
uninformed, there could seem to be a certain sense of “magic” about
them. Read more.
Do you want a chance to name an piece of the Solar System?
In 2016 the OSIRIS-REx spacecraft will fly out to an asteroid and bring
us back some samples. At the moment the asteroid has the code name 1999
RQ36, but the Planetary Society is offering students under the age of 18 the chance to come up with a cooler name.
To take part a parent or teacher must fill in an online formby 2 December 2012, including the name and a brief explanation as to why it was chosen. Read more.
Air moisture is contained even in dry air, but this air
requires significant cooling in order to release its moisture by
condensation. Engineers from ASML, Veldhoven, the Netherlands, now
designed a piping system that makes air condense by pressing it deep
into the ground where ambient temperatures are around 10 °C, providing
the needed cooling for condensation.
An electric fan sucks in warm air at one end of the piping system, while
cooled air as well as water is exhausted at the other end into an
underground cistern. A pump is needed to bring the water back to the
surface. As this piping system might supply desert regions with potable
water, the pump could get its energy from a solar collection system.
A particular advantage of gaining potable water from air moisture is that no purification or distillation is needed. Learn more.
Sabe-se que a construção dos circuitos cerebrais
é guiada em particular por sinais químicos específicos entre neurónios,
uma espécie de sistema de "cheiros" que faz com que dois neurónios se
atraiam ou se repelem. Mas, agora, surpreendentes resultados publicados
na revista Proceedings of the National Academy of Sciences sugerem que essa é apenas uma pequena parte da história. Henry Markram e
colegas, da Escola Politécnica Federal de Lausanne (EPFL), concluem que
o essencial da construção do incrível emaranhado de ligações neuronais
que temos na cabeça se deve, ao que tudo indica, a... uma série de
encontros acidentais entre neurónios. Ler mais.
O objectivo deste blogue é partilhar ideias e materiais úteis para o estudo e para o ensino da Física e da Química. Destinatários: alunos, professores e outros eventuais interessados. Críticas e sugestões são bem-vindas. A autora reserva-se ao direito de apagar comentários despropositados.