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Thursday, January 19, 2012

Metamaterials Can Exert a Whole New Kind of Force



Similar to the mysterious clinging ability of geckoes
Gecko Toes and Their Optically Adhering Counterpart via arXiv
Today in crazy tricks of physics, a few researchers over at the University of Southampton in the U.K. have theorized that metamaterials ought to be able to generate a wholly new kind of force--something akin to the adhesive force created by gecko toes--that can be turned on and off optically with the throwing of a switch. That force ought to be strong enough to overcome the force of Earth’s gravity, opening the door to a range of potential applications--if and when the actual force is found.
The fundamental force here is the same one that powers solar sails in space--the radiation pressure exerted by light on any surface it strikes. If you custom-construct a metamaterial to allow tiny oscillations of electrons--called plasmons--to exist on its surfaces, those plasmons should interact with the electrons in a nearby metal or dielectric surface. The resonant effect created in such a setup should, theoretically at least, pull the metamaterial and the object together.

Moreover, all of this can be controlled by light. Metamaterials--if you haven’t been keeping up with this kind of science--are materials that have been engineered to have specific and controlled optical properties. So under such a setup as the Southampton team proposes, the frequency and intensity of a light source would initiate and then control the force of attraction. That basically means this new force can be switched on and off easily and quickly.
Naturally, applications for something like this abound, from the nano-scale up to the possibility of gecko-like adhesion for machinery (and perhaps for humans? is this what they were getting at in the Tom-Cruise-scales-the-Burj scene in Ghost Protocol?). But first, they have to find it. In their paper, the researchers say the force should be “easy to detect.” We say get cracking then.

Newly Found Meteorites Came From Mars, Scientists Confirm


Act fast — they're selling quickly

Meteorite From Mars This is a 91-gram meteorite from Mars, discovered in December in Morocco. It fell to Earth last July. © 2012 Darryl Pitt/Macovich Collection
Meteorite chunks that fell in Morocco last summer came from Mars, yielding an unexpected 15-pound sample of the Red Planet, scientists confirmed Tuesday. It’s the first time in 50 years — and only the fifth time ever — that scientists have chemically confirmed that pieces of rock came from Mars.
The rocks were found in December and analyzed by a committee of meteorite experts. The biggest one weighs a little more than 2 pounds.
It’s a bonanza for scientists (not to mention collectors) who would love to get their hands on a fresh Mars sample return. These igneous rocks have probably been hurtling through the solar system for a few million years, so they’re not fresh in terms of their Martian removal. But they’re certainly fresher than the previous Mars samples — the other ones sat on Earth for at least decades, and in some cases millions of years. The meteorites were sheared off Mars after an impact.
Meteorite dealer Darryl Pitt, who is selling a large stock of samples, said he has sold dozens of specimens already. Wednesday morning, he bought some more material from a Berber seller in Morocco, he said in an e-mail.
"I suspect that this will be the last of it. It's selling very fast — faster than any meteorite in the last twenty years — to both private collectors and institutions," he told PopSci.

The sum total of Mars rocks on Earth weighs in at 240 pounds, according to the AP. The last time anyone found a freshly fallen one was in 1962. Despite decades of sending orbiters and robots to Mars, no one has ever built something that could return home, bringing Mars samples with it. NASA and the European Space Agency are collaborating on instruments for a potential future mission, but this at least a decade away.
Alan Stern, former NASA sciences chief and current director of the Florida Space Institute at the University of Central Florida, told AP this meteorite fall was like Christmas in January. “It’s nice to have Mars sending samples to Earth, particularly when our pockets are too empty to go get them ourselves,” he said.
Pitt is charging between $11,000 to $22,500 an ounce — making the meteorites 10 times more valuable than gold. You can check out some remaining samples.
[via AP]

How Robots Will Do the Heavy Lifting in the Sahara and Antarctica

Building in the Sahara Graham Murdoch
Already under construction, these two projects are saving humans from having to work in two of the most inhospitable environments on the planet: the Sahara Desert, and the South Pole in Antarctica.

BUILDING IN THE SAHARA

The Fraunhofer Institute for Manufacturing, Engineering and Automation in Stuttgart, Germany, is developing a robot to construct a 2,270-square-mile solar farm in the Sahara. The 100-ton Industrial Parallel Kinematics device (IPAnema) is similar to the Skycam that hovers above the field at NFL games: 2,000 feet of polyethylene cable strung between four mobile towers suspend the end effector, a box with jaws built for grasping solar reflectors. IPAnema will be ready for work in 2015.
End Effector: Built for grasping and lifting, the steel and aluminum end effector delicately picks up and places thousands of seven-ton, 40-foot-long solar reflectors. It then sets them down anywhere within the 26,896 square feet between the four support towers.
Winches: The IPAnema’s motor-driven winches rapidly spool and unspool eight cables that control the suspended end effector. The winches rotate the end effector on all three axes at almost 3 mph, and each cable can support nearly 10,000 pounds.
Force Sensors: At each end of the cable, attached to both the winch and the suspended end effector, are force sensors. The sensors synchronize the winch motors to within two milliseconds and track the end effector’s movement in space within millimeters.
Support Towers: The robot’s framing system—four modular 36-foot-high steel pylons—arranges itself on automated bases. The four towers create constant tension to prevent the payload from swaying, which will help secure it against accidents in high desert winds. —by Arnie Cooper
Traversing Antarctica:  Graham Murdoch

TRAVERSING ANTARCTICA

This winter the National Science Foundation and one of its contractors, Raytheon Polar Services, is shuttling fuel 1,040 miles from its coastal Antarctic base, McMurdo Station—the primary American logistical hub—to the Amundsen-Scott South Pole Station. A century ago, Norwegian explorer Roald Amundsen became the first man to reach the pole. He used sled dogs and skis; the NSF and Raytheon will soon use automated Caterpillar and Case tractors. The robotic vehicles will crawl across the continent at 5 to 12 mph for 24 hours a day, accomplishing in just a week and a half what took Amundsen nearly two months.
Bladders: Each tractor hauls at least ten 3,000-gallon fuel bladders and consumes nearly two of them during the 2,080-mile round trip.
Lead Vehicle: Onboard computers will determine the ideal speed and direction to maximize fuel efficiency, relaying the information to the rest of the fleet. Algorithms determine the “threat” of objects and reroute the tractors accordingly.
Twin Cameras: Positioned about a foot apart, the two cameras create stereographic imagery to distinguish between a pile of snow, a snowmobile, a person and an open crevasse. Then the cameras gauge the object or feature’s distance.
ARS-300 Radar: The vehicle uses its radar (the same kind Google has on its self-driving cars) to “see” through storms. Although the radar cannot read surface structures as accurately as the tractor’s laser scanners can, driving snow confuses the laser.
Laser Scanner: The tractor’s laser scanners fix on details in the terrain—up to 200 feet away—to create a map that is uploaded to the computer and used for navigating. The scanner also helps avoid collisions between tractors. —by Andy Isaacson




Nail Art Design



Nail art designs are not for every one. Both creating a nail art design and carrying it off are equally challenging. Creating a nail art is really an art and it needs patience and lots of creativity to create a masterpiece.
Following nail art designs will show you how creative people can be. Making such a beautiful use of nails.


Nail art

Panda Nail Art

Nail Art design

Valentine's day nail art


Nail art



Caught Butter-Handed



 


Krishna's lotus hand“Mother Yashoda wanted to impress upon Krishna that since He was afraid merely to see her stick, He should not perform such disturbing activities as breaking the container of yogurt and butter and distributing its contents to the monkeys.” (Shrila Prabhupada, Shrimad Bhagavatam, 10.9.12 Purport)
Feeding butter and yogurt churned for the family to stray monkeys is not a good thing. That this lesson was imparted to the Supreme Personality of Godhead in the form of a small child makes the situation all the more amusing. Imagine walking into a room and seeing your beloved son feeding food to monkeys that are known to come by and steal whatever you have. The monkey does not have a dharma to follow; it does not have rules and regulations guiding its behavior. When a human being behaves erratically, eating whatever food is available and not controlling their sexual urges, they outwardly resemble a monkey. Mother Yashoda sternly warned her child against taking something that didn’t belong to Him and giving it away to those who weren’t deserving of it. Through her instruction she delights the hearts of the souls who want nothing but the Supreme Lord’s association in life.
Krishna and Mother YashodaWhy is that company desired? In every turn in a temporary world there is a chance for destruction, the total loss of what has been accumulated. The material amenities are available in such abundance in the modern age that a common game played amongst friends involves what you would renounce and what you would keep. The game starts with the hypothetical scenario of being trapped on a deserted island. You neither have an abundance of possessions nor the ability to easily procure them. In our home we may be lacking a certain film on DVD, a computer to do work on, some food items required for preparing dinner, an appliance to cook with, or some other ancillary item. The lack of that item isn’t a cause for despair, for one can go out to the nearby store and grab whatever is needed without too much of a hassle.
On the deserted island there is no such ability. As resources are limited, the crux of the game is deciding what important items you would take with you. For instance, if you could only take one book, which one would it be? From the rules of the game there is the underlying assumption that there are already many books to choose from in the person’s life. The fact that you would pare down the list to just one shows that there are multiple books that you try to derive enjoyment from. For the game, pick just one book that you can read over and over again. If you could only have a single book, one set of words to read, which would it be?
Obviously, the resulting choice would indicate the player’s favorite book. The same principle applies to picking a movie, a set of clothes, or a type of food. The hypothetical scenario in the game also creates a sense of dependence. If you can only read one book, you will rely on those pages for your entertainment, for the stimulation of the mind. That reliance on the book will make you so much more appreciative of the content. If you have something in abundance, you can take it for granted, so much so that you might not even connect with it. For instance, if you have relatives living close by, you may think to yourself, “Oh, I can see them any time. There is no urgency in spending time with them.” On the other hand, if relatives from far away come for a visit, you try to maximize the amount of time spent with them. As such, there is the likelihood that over the course of the year you spend more time with the people that live further away than you do with those who are close by.
The topmost transcendentalists play the deserted island game without even knowing it. They pick one subject matter to focus on exclusively, and since they weed everything else out, they have full reliance on those works and the sound vibrations that come from them. A yogi is a transcendentalist who controls their senses to realize the self. Of all the yogis, he who always thinks of Krishna, or God, is the best.
“And of all yogis, he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in yoga and is the highest of all.” (Lord Krishna
 
Bhagavad-gita
 
, 6.47)
Lord KrishnaThe yogi immersed in Krishna consciousness is the best because Bhagavan is the most complete representation of the Absolute Truth. The more features that are defined in the worshipable object, the more pleasure the worshiping individual will derive. With increased pleasure comes a desire to repeat the activity. A repeat of the activity gradually turns into a routine and pretty soon a way of life. If I spend my time basking in the sweet association of Krishna’s name, form, attributes and pastimes, what time will there be left for misery, despair, chaos, tumult, angst, hopelessness, and fear of total loss?
What specifically do the yogis practicing bhakti, or divine love, hold on to for sustenance? What is it that they carry with them to the deserted island scenario created within the mind? The holy name of the Lord is non-different from Him, so all that is required is a sequence of powerful words that can be remembered, repeated, heard, and contemplated on over and over again. Thankfully for us, Lord Chaitanya
 
, Krishna in the form of a preacher, revealed the most sacred mantra, one that can be recited by the most number of people and thus revive the dormant love for Godhead within society at large.
 
, “Hare Krishna Hare Krishna, Krishna Krishna, Hare Hare, Hare Rama Hare Rama, Rama Rama, Hare Hare
 
”, is the lifeblood for the devoted soul immersed in bhakti-yoga. Seems rather strange that chanting could be the only requirement, but it is sort of like a foundational practice, one that feeds the other outlets of transcendental interaction. Just as the food we eat is the fuel for the activities we take on throughout the day, the chanting of the holy names is the spiritual food for the soul enlivened by the bhakti spirit.
For reading material, the yogi in bhakti relies solely on those works which describe the sacred pastimes of the Supreme Personality of Godhead. Since the pastimes are unlimited, the wise pick out just the holy name to hold on to, as its recitation is superior to witnessing the Lord’s actions and even being in His personal company. As an example, we know from the Shrimad Bhagavatam
 
, the foremost bhakti-shastra, or scripture on devotion, that Shri Krishna descended to this earth some five thousand years ago and played as a child in the holy land of Vrindavana
 
. One of Krishna’s pastimes involved breaking a pot of butter in anger. Mother Yashoda had temporarily stepped away from feeding Krishna to tend to a pot of boiling milk on the stove. Unhappy that His mother diverted her attention, Krishna broke the pot of butter she had just churned, grabbed some of the goods and then ran away. While He was eating some of the butter Himself and distributing the rest to monkeys, mother Yashoda went looking for her young boy.
Krishna with butterCaught “butter-handed” in another room, after delighting in the vision mother Yashoda chased after her naughty child with a whipping stick. When she finally caught Him, she saw fake tears rolling down from the eyes of her beloved son, who was afraid that the mother would punish Him. Mother Yashoda instead decided to tie Krishna to a mortar, so that He wouldn’t run away from home out of fear. At the same time, she wanted Him to know that taking butter and giving it to monkeys was not sanctioned behavior.
The yogi who contemplates on this scene is actually in a superior position, though it may seem otherwise. From the descriptions of this event found in the Shrimad Bhagavatam, the sincere soul holding on to the holy name for dear life can repeatedly take a dip in the ocean of bliss that is Krishna’s sweet pastime of breaking Yashoda’s pot of butter. If we have a portrait of the event, it is nice to look at, but with a defined portrayal there are some limits introduced. If we just hear of the event and picture it within our mind, however, we can repeatedly contemplate on that image and continue to derive tremendous pleasure.
The yogi following bhakti thinks of such pastimes every single day. You can remember Krishna as the butter thief always and never grow tired. Day after day you can remember Yashoda’s instruction and laugh at how she had to explain such a common sense rule to her son. There are many other such pastimes described in the Bhagavatam, and they come to the mind of the soul who constantly hears the holy name of Krishna. That name can be heard at any time by reciting the maha-mantra, which is a set of words we should never leave home without. Whether in opulence or in squalor, any person can take the holy name as their most valuable possession.
In Closing:
If to a deserted island you should go,
Not many possessions there you know.
So take only those things you really need,
Automatically choose favorite items indeed.
Appreciation augmented by full reliance,
Nothing else around, on object full dependence.
For the yogi keep always one person in mind,
Who in her courtyard feeding monkeys mother did find.
Think of Yashoda telling Krishna that break pots He can’t,
Sweetest mental portrait drawn through holy name’s chant.

‘Open-source’ robotic surgery platform to top medical research labs



 
by  

Robotics experts at the University of California, Santa Cruz and the University of Washington (UW) have completed a set of seven advanced robotic surgery systems for use by major medical research laboratories throughout the United States. After a round of final tests, five of the systems will be shipped to medical robotics researchers at Harvard University, Johns Hopkins University, University of Nebraska, UC Berkeley, and UCLA, while the other two systems will remain at UC Santa Cruz and UW.
Team members posed with components of the Raven II surgical robotic systems developed in the Bionics Lab at the Baskin School of Engineering. (Photo by Carolyn Lagattuta)
“We decided to follow an open-source model, because if all of these labs have a common research platform for doing robotic surgery, the whole field will be able to advance more quickly,” said Jacob Rosen, associate professor of computer engineering in the Baskin School of Engineering at UC Santa Cruz and principal investigator on the project.
Rosen and Blake Hannaford, director of the UW Biorobotics Laboratory, lead the research groups that developed the Raven II robotic surgery system and its predecessor, Raven I. A grant from the National Science Foundation funded their work to create seven identical Raven II systems. Hannaford said the systems will be shipped out from UW by the end of January. After they are delivered and installed, all seven systems will be networked together over the Internet for collaborative experiments. Continue reading below…

Robotic surgery has the potential to enable new surgical procedures that are less invasive than existing techniques. For some procedures, such as prostate surgery, the use of surgical robots is already standard practice. In addition, telesurgery, in which the surgeon operates a robotic system from a remote location, offers the potential to provide better access to expert care in remote areas and the developing world. Having a network of laboratories working on a common platform will make it easier for researchers to share software, replicate experiments, and collaborate in other ways.
Even though it meant giving competing laboratories the tools that had taken them years to develop, Rosen and Hannaford decided to share the Raven II because it seemed like the best way to move the field forward. “These are the leading labs in the nation in the field of surgical robotics, and with everyone working on the same platform we can more easily share new developments and innovations,” Hannaford said.
According to Rosen, most research on surgical robotics in the United States has focused on developing new software for various commercially available robotic systems. “Academic researchers have had limited access to these proprietary systems. We are changing that by providing high-quality hardware developed within academia. Each lab will start with an identical, fully-operational system, but they can change the hardware and software and share new developments and algorithms, while retaining intellectual property rights for their own innovations,” Rosen said.
The Raven II includes a surgical robot with two robotic arms, a camera for viewing the operational field, and a surgeon-interface system for remote operation of the robot. The system is powerful and precise enough to support research on advanced robotic surgery techniques, including online telesurgery.
In addition to Rosen and Hannaford, UCSC postdoctoral researchers Daniel Glozman and Ji Ma, along with a group of dedicated undergraduate students working in Rosen’s Bionics Lab, played a key role in developing the Raven II. Rosen and Glozman have also developed a Raven IV surgical robotics system, which includes four robotic arms and two cameras. The system enables collaboration between two surgeons working from separate locations and connected over the Internet.