Wew..akhirnya spiderman 2 release…dari thriller yang bisa kita lihat berikut, tampaknya ada beberape penambahan komposisi cerita yang seru dan menegangkan, terutama pada saat Bibi Mae – Bibi Peter Parker, mengungkap sebuah rahasia yang dia sembunyikan selama merawat peter. Dan hal ini tentunya akan sangat berdampak besar bagi kehidupan Peter, karena baru kali ini dia bisa melihat dan mendengar ayahnya yang sudah lama dia anggap tidak menyayanginya. Tampaknya ada segurat penyesalan dari Peter yang selama ini salah mengira akan tindakan kedua orang tuanya.
Penambahan tokoh baru yang sepertinya sebaya dengan Peter,membuat sensasi tersendiri, menurut saya ini adalah film superhero yang layak ditonton dan sayang untuk dilewatkan. Saya sendiri merasa tidak sabar menunggu premiernya di Indonesia, semoga bisa lekas nonton…..:D
Carbon nanotubes are a promising material for making display control circuits because they’re more efficient than silicon and can be arrayed on flexible surfaces. Until recently, though, making nanotubes into transistors has been a painstaking process. Now researchers at the University of Southern California have demonstrated large, functional arrays of transistors made using simple methods from batches of carbon nanotubes that are relatively impure.
|Nanotube array: This photo shows a three-inch silicon wafer covered with an array of carbon-nanotube transistors. Though these transistors were made using simple processes at room temperature, their performance is good enough to drive display pixels.
Credit: ACS/Nano Letters
The pixels in a computer or television screen, whether it’s an LCD or plasma, are each controlled by several transistors. In today’s devices, these transistors are made from silicon. Arrays of these transistors need to be made at high temperatures and in a vacuum, so they’re very expensive, says Chongwu Zhou, an associate professor of electrical engineering at USC and researcher on the nanotube project.
Transistors have also been made from carbon nanotubes, but that, too, presents challenges. “Many people use one nanotube to make a very small, high-performance transistor” for computer chips, says Zhou. But that one-to-one ratio won’t work for displays, in which a large surface must be covered in transistors. “If we use one nanotube for one transistor, the yield will never be high enough” to work for large-scale manufacturing of big screens, he says. Zhou believes his approach will solve this problem by making larger transistors from mats of nanotubes.
The USC researchers make large arrays of carbon nanotube transistors using solution-processing techniques at room temperature. They start by placing a silicon wafer in a chemical bath to coat its surface with a nanotube-attracting chemical, then rinse off the residue. The treated wafer is then immersed in a solution of semiconducting carbon nanotubes, which are attracted to its surface. The wafer, now coated with a carpet of nanotubes, is rinsed clean again. To make transistors from this tangled mess, the researchers put down metal electrodes at selected locations. The electrodes define where each transistor is and carry electrons into and out of the nanotubes that lie between them. Areas of silicon underlying each device act as the transistors’ gates. So far, they’ve built a prototype device on a four-inch silicon wafer and used it to control a simple organic light-emitting diode display. This work is described online in the journal Nano Letters.
technology used by scientist 10 years a head
How it works: The idea here is to use satellite-guided sailing ships to crisscross the oceans, constantly spewing a fine stream of sea mist into the clouds.
Turns out particles, in this case the salt in the sea mist, will cause clouds to become denser, reflecting more sunlight back into space and keeping the planet cooler.
The novel ship design actually dates back nearly a century, when the German inventor Anton Flettner built one that crossed the Atlantic. The mist towers are hollow and rotate in the wind, acting as sails. It can cross the Atlantic faster than a conventional sail boat and do so without a crew. The power for the mist pumps is generated by the turbine under the hull.
Each ship would cost $2 or $3 million, making the entire program cost just a few billion dollars.
About 1500 ships would be needed to maintain current temperatures, according to John Latham, a scientist at the National Center for Atmospheric Research.
Beyond the machine: Like most scientists studying geoengineering, Latham said it is not a substitute for reducing greenhouse gas emissions as it does not address other problems associated with too much carbon dioxide.
He also said the idea, like most other geoengineering ideas, needs much more study before it’s deployed on a wide scale, as any other potential side effects are still unknown.
Source : Steve Hargreaves, CNNMoney.com staff writer