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Shuttle Arrives at Space Station with Key Part

Relief is on the way.

The space shuttle Discovery has docked at the International Space Station carrying the pressurized section of the Kibo Japanese Experiment Module (JEM), a key component for the orbiting science platform.

But the Kibo laboratory is not the component that has the media buzzing. That distinction falls to a small replacement part dispatched to fix a malfunctioning zero-gravity toilet aboard the ISS.

Photo: NASA
THANKS FOR DROPPING BY: The crew of ISS Expedition 17 welcome colleagues from Discovery's STS-124 mission to their orbiting outpost--which has been experiencing a rather embarrassing problem recently.

According to NASA, the crew of mission STS-124 maneuvered Discovery into a back flip so that their Expedition 17 counterparts on the space station could take close-up photos of the underside of the shuttle to look for damaged thermal tiles before approaching and docking at the ISS at 2:03 pm EDST. The astronauts and cosmonauts opened the hatches of the two vehicles about two hours later to exchange greetings and get down to the business of their nine-day joint operations.

The main order of that business will be three spacewalks to attach the 17-ton Japanese Pressurized Module to the ISS. This is the second of three missions designed to assemble the JEM section of the space station. Once finished, the Japanese science lab will become the largest module on the orbiting platform, offering future visitors the opportunity to conduct space medicine, biology, material production, biotechnology, and communications research.

Still, it's that spare toilet pump that's grabbing all the attention. The loo aboard the space station is a Russian-made facility that consists of two devices that collect human waste. The balky unit in question is the one used to suction urine in weightlessness. A broken valve caused it to fail recently, forcing the male crew to turn to alternate methods of relieving themselves. The problem, while not mission critical, is a hygienic inconvenience (and likely personal annoyance) for the Expedition 17 cosmonauts and astronauts. The fix for the toilet should be a simple procedure once the new part is on board.

The crew of STS-124 will spend most of their working hours moving the new Kibo lab section from the shuttle's cargo bay to its position on the exterior of the ISS, relocating the lab's logistics module, which was installed in a temporary spot during the last STS mission, and then join the two together.

Discovery also delivered Canadian-born astronaut Greg Chamitoff to replace flight engineer Garrett Reisman as a station resident for the next six months.

Upon greeting one another over 200 miles above the planet, Chamitoff told Reisman, "You have a beautiful house." Now, it's a house that should soon have a properly working toilet.

Nanotechnologyâ¿¿s Role in the Dawning of the Singularity

One has to applaud Spectrum for taking on the subject of the Singularity in this monthâ''s special issue, â''Rapture of the Geeksâ''.

I imagine the magazine will face criticism from either side of the question, which makes the audacity of their project all the more awe inspiring.

All of the video interviews and interactive elements are not yet available online, but I will be checking back regularly for when they are.

In the meantime, I was pleased to see one of my favorite nanotech bloggers, Prof. Richard Jones of Soft Machines, has contributed to the articles with his â''Rupturing the Nanotech Raptureâ''.

It seems that Jones was given the charge â''to discuss both the prospects for nanotechnology contributing to a singularity on Kurzweilian time-scales, and what the actual achievements of nanotechnology were likely to be over that period.â''

The Kurzweilian period seems to be in about 15 years, and going by the nifty little chart â''The Singularity: Whoâ''s Whoâ'', Kurzweil is singularly alone in his optimistic time scale.

Setting aside definitions of what the Singularity was intended to mean, and what it has come to mean to those who have taken up its cause, Jones wades once again into the sticky topic of molecular nanotechnology, nano assemblers, and nanobots, all of which constitute the tools that Singularity proponents point to as enabling its approach.

As one might expect to those are familiar with Jones' book "Soft Machines", Jones puts aside the mechanosynthesis approach for providing a solution, at least in the short term, and turns attention to biological solutions (check sidebar the â''The Real Nanobotâ'').

However, according to Jones, having complete control of matter through software remains unattainable for generations to come. Nonetheless, we should not abandon the pursuit of more radical nanotechnology since it may lead to the â''true killer appâ'' that Jones describes as â''devices that integrate electronics and optics, fully exploiting their quantum character in truly novel ways.â''

In all itâ''s a deftly diplomatic piece, at once dispelling some of the myths surrounding the timeline for molecular nanotechnology contributing to the Singularity while both complementing and urging on the early pioneers of its concept.

Neuroscientist Tononi Confirms Bourne Identity Conceit

Yesterday, May 30, speaking at a panel held under the aegis of New York Cityâ''s first annual World Science Festival, Spectrum author Julio Tononi told an audience at the Museum of Modern Art that the Bourne Identityâ''s artistic conceit is not merely plausible but in fact completely credible. In the first film of the hugely successful Bourne triology, Jason Bourne turns out to be a former remorseless CIA assassin. Though at the outset he has no memory of who he is or his life history, he has, inexplicably to him and the attractive but flakey German woman he has picked up while running for his life, the entire skill set that a top-level international hit man would be expected to have.

Yesterdayâ''s MOMA panel brought together Bourne director Doug Liman, a film scholar and script writer who served as moderator, and Tononi, an Italian-born psychiatrist and neuroscientist, now at the University of Wisconsin. Disarmingly, director Liman said that when he conceived and developed the Bourne films over eight years, he considered Bourneâ''s special kind of amnesia a fictional device and did not really care whether it had any basis in reality. But Tononi told of a patient presented to him when he was doing his medical residency in Italy: a geography teacher, the man woke up one day with no idea who he was, what his life story was, or who his wife was; however, he could effortlessly recite every important town and city in Italy, along with a wealth of other information any geography teacher would be expected to have at his fingertips.

Every panelist at the near-capacity MOMO event had something of interest to say. Moderator James Schamus talked about a late-Fifties movie, Three Faces of Eve, which was based on a real woman with three separate personalities; without skipping a beat, Tononi, threw up a slide of the Eve movie poster, saying that in cases of multiple personalities, separate regions of the brain light up in a scan, as the person switches from one personality to another. The director talked about how he had taken a â''Republicanâ'' novel, in which the Soviet assassins were bad guys and the American assassins good guys, and turned it into a â''Democraticâ'' movie in which all the assassins were bad; when asked whether Bourne was â''guiltyâ'' of the murders he committed, Liman said without hesitation that of course he was. Tononi, however, pointed out that there have been cases of sleepwalkersâ''a situation in which one is conscious but not self-conscious and arguably not responsibleâ''who have committed crimes, even in at least one case a murder, and been acquitted.

The MOMA panel basically was set up to be Tononiâ''s show, and so he canâ''t be accused of having stolen it. But if it had been necessary for him to steal itâ''letâ''s say he showed up at the panel without any notion of who he was and where he was, but soon discovered that inexplicably he knew way more about the brain than anybody else in the roomâ''he would have effortlessly run away with the event.

At the outset and through much of the discussion, Tononi talked mainly about how highly compartmentalized the brain is. But at the end, he took everybody a little by surprise with an eloquent statement about how the brain is subtly or not so subtly changed by every single thing it takes in, and how the whole is affected by changes in the parts, modifying our character for ever; he advised us, gently, to make better friends with our brains. It was a surprisingly spiritual statementâ''and got an approving nod from director Liman as well as many in the audienceâ''coming from a man who argues in the current issue of IEEE Spectrum that some day, in fact, machines will achieve full consciousness.

Spectrumâ''s June special issue, â''Rapture of the Geeks,â'' explores the question of whether supersmart machines will ever be smart enough to make us humans obsolete.

Stanford graduate students solve the silent Prius problem

2355512640_5a354fc579.jpgI live in a Prius neighborhood. In the short two-block walk to the local elementary school this morning, I counted six. In general, I think thatâ''s a good thing.

I also live in a â''playborhoodâ'', thatâ''s a new word for a retro idea: a neighborhood in which kids play unorganized pickup games outside, sometimes (OK, a lot of times) in the street. In general, I also think this is a good thing.

But combine these two trends, and, in the eyes of a worried mom, youâ''ve got an accident waiting to happen. The kids are pretty good about listening for a car turning onto our street and scoot to the sidewalks. But a Prius operating in electric mode is virtually silent.

Besides being a threat to kids playing in the street, the silent car is a nightmare for blind pedestrians. Concern about silent car dangers led to the introduction of the so-called â''Bell the Hybridâ'' Act, a.k.a. the Pedestrian Safety Act of 2008, HR 5734, introduced in April which, if it passes, would direct the Secretary of Transportation to establish a motor vehicle standard that would alert pedestrians to a carâ''s approach.

That wouldnâ''t be hard; there are a number of ways one could do this; heck, kids have

been clipping playing cards to make their bicycles buzz for generations. One suggestion is a radio transmitter that sends a signal to some sort of buzzer carried by the blind. Thatâ''s unlikely to fix the kid-in-the-street hazard, however.

Another approach is already in prototype and going on the road this summer to conferences aimed variously at the auto industry or the vision impaired. Called the PANDA system, or â''Pedestrian Awareness Noiseâ''emitting Device and Application,â'' it comes from Enhanced Vehicle Acoustics, a corporate name for two Stanford University graduate students, Bryan Bai, an electrical engineering graduate student, and Everett Meyer, medical student. The PANDA system uses small speakers installed in the front wheel wells and under the back fender; a little box (the prototype sits in front of the gear shift) sends the sound to the speakers. The system designers say the noise isnâ''t audible from inside the car; from the outside, itâ''s just a little quieter than a normal combustion engine. You can hear it for yourself here or below.

Photo credit: auntjojo

High-rate, Directed Assembly of Nanostructures Promises Big Changes in Electronics

One of the problems plaguing the application of nanotechnology into electronics is that it has proven quite difficult to develop a reliable process for high-rate, directed assembly of nanostructures. Processes like ultra-violet nanoimprint lithography have been restricted to very low rate processes.

Now, researchers at the National Science Foundation's Nanoscale Science and Engineering Center for High-rate Nanomanufacturing (CHN) at Northeastern Universityâ''with partners UMass Lowell and University of New Hampshire--are claiming they have developed a process that enables directed assembly of single-walled carbon nanotube (SWNT) networks to create a circuit template that can be transferred from one substrate to another.

The researchers, led by Ahmed Busnaina, are expecting that this approach will make possible the mass production of reliable nanoscale structures, ultimately leading to a host of applications in consumer electronics.

While it appears the research was specifically targeted for industry, I cannot see if the CHN had any industrial partners for this specific project. However, they do note some industrial partners for the overall center. No specific journal was mentioned for where they published their findings, other than the Small Time article I linked to above.

Tribute to computing pioneer Jim Gray to be webcast Saturday

jimgray.gif Jim Gray, one of computingâ''s greats, will be honored by his colleagues and family this Saturday morning (9 a.m. PDT) at a ceremony at the University of California at Berkeleyâ''s Zellerbach Hall and in a live webcast here. Gray, winner of the Association for Computing Machineryâ''s Turing Award in 1998 for his contributions to database and transaction processing, disappeared at sea in January of 2007. His disappearance, during a short solo sailing trip in good weather, remains a mystery, in spite of an exhaustive high tech search, in which countless volunteers examined thousands of satellite images looking for clues. The long hunt ended in May 2007.

Gray earned the first PhD in computer science ever awarded by the Univeristy of California at Berkeley back in 1969; he worked at Bell Labs, IBM, Tandem Computers, Digital Equipment Corp., and Microsoft, convincing the Redmond, Wash., giant to open a research center in San Francisco so he wouldnâ''t have to move. Researchers credit his work with enabling ATMs, ecommerce, online ticketing, and other database intensive services we take for granted today. In recent years, Gray focused on the effort to create a world-wide telescope and in building a digital library of the worldâ''s scientific literature. Read a recent interview in IEEE Distributed Systems Online here.

At the tribute, sponsored by the IEEE Computer Society, the ACM, and UC Berkeley, Mike Olson, vice president of embedded technologies at Oracle, will talk about the search effort, computer science professor Mike Harrison will discuss Grayâ''s impact on Berkeley, and David Vaskevitch and Rich Rashid, Microsoft senior vice presidents, will describe Grayâ''s contributions to the computing industry.

Solar Squabble Amplified by Popular Podcast

Spectrum's April 2008 feature on growing dis-ease within the community of researchers developing plastic solar technology -- "Solar Cell Squabble" -- is itself featured today in a leading podcast on renewable energy. The story laid bare widespread concern over the possible mismeasurement of performance of the potentially cheap and flexible organic photovoltaics. An interview on the story behind the story tops the weekly Inside Renewable Energy podcast published by RenewableEnergyWorld.com.

Organic PV researchers concerned by the measurement controversy's impact on their field are organizing to keep the issue on the front burner. UCLA organic pv expert Yang Yang and Christoph Brabec, a senior scientist at organic PV developer Konarka Technologies, organized a session on "Accurate Measurement of the Efficiency of Organic Photovoltaic Devices" for the upcoming conference SPIE Optics + Photonics (see Session 5 under the Organic PV track). This annual meeting of the International Society for Optics and Photonics will take place August 10-14 in San Diego.

Yang estimates that the organic PV field has overstated performance by about 30% through inattentive handling of light sources with a different color balance from sunlight. He says testing very small cells has inflated results by another 20-40%. He says it's inevitable that, without change, the field's credibility will be burned. "We need to take care of this issue before it is too late," says Yang. "In fact, it is already late."

Nanowires Produce More Efficient Thin-Film, Polymer-based Photovoltaics

Last month I submitted a blog entry that suggested if there were a third generation of photovoltaics (first-generation solar cells (single-crystal silicon wafers) and second-generation solar cells (thin-film semiconductors)) using quantum dots that could reach or exceed the 32% Shockley-Queisser Limit than the economics of photovoltaics could improve and their adoption accelerated.

To add to this mix has been recent research at the University of California San Diego in which electrical engineers have added nanowires to polymer-based thin-film photovoltaics to create solar cells that increased the forward bias current by six to seven orders of magnitude as compared to their polymer-only control device.

The work was published in American Chemical Societyâ''s NanoLetters.

When one considers how much cheaper thin-film polymer photovoltaics are compared to single-crystal silicon wafers, and then factor in the possibility of thin-film polymer solar cells becoming orders of magnitude more efficient, things start to look pretty rosy.

But hold on, there remains some pretty fundamental problems, most notably that the polymers begin to degrade quite rapidly when exposed to air. However, the researchers point to work going on around the world to improve the properties of organic polymers that could overcome this problem.

In light of the recent series of entries here and here on this site regarding a potential â''Photovoltaics Mooreâ''s Lawâ'' based on ever decreasing price points as opposed to the ever increasing number of transistors per unit of a chip, and the strong reaction to them, it may be worth adding that we may not have to remain bound to the paradigm of silicon wafers and its incremental improvements.

Is Photovoltaic Moore Law Really on Track?

Last week, based on an IEEE photovoltaics conference that had just taken place in San Diego, I reported on some positive developments: a kind of Mooreâ''s law allegedly at work, a better outlook for first-generation silicon cells, and a growing expectation that solar electricity may be commercially competitive in some parts of the world by 2015. It appears that I misstated and overstated the case for a photovoltaic Mooreâ''s law, havingâ''Iâ''m most embarrassed to sayâ''misread one of my own previous blog entries.

I said last week that PV costs per watt had dropped from about $7 in 2004 to $4-5 in 2007, but â''Halâ'' pointed out in a comment posted May 22 that my previous blog in fact cited 2007 PV costs of $7.6 or $6.2 (depending on whose numbers you believe). That would be tantamount to a cost reduction of 15 percent at most, and perhaps none at allâ''not the 40 percent reduction I thought I had discerned, consistent with the â''photovoltaic Mooreâ''s lawâ'' that postulates a 20 percent reduction with every doubling of cumulative production capacity.

In recent years, total capacity has been doubling about every 18 months, but longer term the rate has been more like 30 months, according to John Benner of the National Renewable Energy Laboratory, who takes some credit for originating the PV Mooreâ''s law postulate. Benner says the three years from 2004 to 2007 were anomalous because of a run-up in silicon prices and, perhaps too, the deteriorating value of the dollar.

Even so, relative to wind, photovoltaic costs do indeed appear to have improved rather dramatically between 2004 and 2007, from 7:1 to 4:1 or 5:1, close to 40 percent. Thatâ''s significant, as distributed PV only needs to be about half as costly as central wind to be competitive. But PVâ''s better standing owes as much to an escalation in windâ''s costsâ''connected with booming global demand for turbines and the general run-up in power plant costs, most likelyâ''as to any cost reductions of its own.

The solar-wind comparison is a reminder that the photovoltaic Mooreâ''s law is subject to market forces in a way that the real Mooreâ''s law is not, as comments on my May 17 blog emphasized. Even the semiconductor Mooreâ''s law is of course not a law in the normal sense; itâ''s a prediction that happens to have been born out, so far, by reality. But it at least is stated strictly in terms of physical parameters (how many transistors per unit area of chip). The PV Moore law is stated in terms of costs, making it subject to extraneous market forces.

â''It used to be an axiom that solar power grew steadily cheaper as time passed,â'' The Economist magazine noted last April. â''After all, it had done so reliably for the previous 40 years.â'' But in the last years, Germanyâ''s extravagant solar subsidies have driven up global prices for silicon, from $25 per kilogram in 2003 to around $400/kg now. â''We didnâ''t have a silicon shortage, we had an over-stimulated market,â'' comments Benner.

Even if the consternation the higher silicon prices have aroused among solar boosters is somewhat misplacedâ''after all, just about every other energy cost is sky-rocketing tooâ''the situation has prompted arguments that solar subsidies should be eliminated in favor of R&D support.

Is there an optimal rate of PV growth? If we try to give the industry too much of a kick can that backfire, disrupting the learning curve thatâ''s supposed to yield â''grid parityâ'' by middle of the next decade? Should research and production incentives be targeted or technology-neutral, and what is the right mix? Who provides the better model, Germany or Japan? Those were just the questions under discussion at the San Diego PV Accelerator Forum, and which will continue to be discussed by all who have the future of solar electricity and renewable energy at heart.

Meanwhile, I apologize to my readers for having overly accentuated the positive. I hope I read your writing more meticulously than I sometimes reread my own.

The Long and Short of Carbon Nanotubesâ¿¿ Similarity to Asbestos

A recently published paper in Nature Nanotechnology submitted by researchers at Edinburgh University led by Ken Donaldson has provided evidence that some carbon nanotubesâ''specifically multi-walled carbon nanotubes (MWNT) that are longer than 20 µmâ''have the same pathogenic effects as asbestos.

Like asbestos, the MWNTâ''s toxicity is not due to their chemical composition but their physical characteristics, namely their length.

The pathogenic quality of both MWNTs of a certain length and asbestos occurs when the bodyâ''s phagocytes attempt to engulf the fiber, and when unable to get around the entire length of the fiber, the phagocytes try to kill the fiber with toxic products. The attempt fails to kill the fiber but succeeds in damaging the surrounding tissue.

If you donâ''t have a subscription to Nature, I suggest reading Richard Jones blog entry at Soft Machines, which gives a pretty thorough review of the findings and what it all means.

As Jones notes, â''not all carbon nanotubes are equal when it comes to their toxicity. Long nanotubes produce an asbestos-like response, while short nanotubes, and particulate graphene-like materials donâ''t produce this response.â''

Jones further emphasizes, â''the experiments do not say anything about issues of dose and exposure.â''

While Jones did not initially know what percentage of the carbon nanotubes on the market fit the description of those that were used in the tests, the International Council on Nanotechnology (ICON) provided a backgrounder that provides some information in this area.

The MWNTs that might fit this description, Jones notes, are integrated into a material matrix, which leaves the threats of exposure in two areas: workers who are working with the MWNTs before they are integrated into a material matrix and what happens in the life cycle of the products, especially after disposal.

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