Low cost space power generation

The success of this study has given a method of fabricating durable copolymer films without size limitations. Previously, only compression molded samples were durable enough to generate electrical energy. The strengthened specimens are very long lived materials. The lifetime was enhanced at least a factor of 1,300 in full pyroelectric conversion cycle experiments compared with extruded, non-strengthened film. The new techniques proved so successful that the lifetime of the resultant copolymer samples was not fully characterized. The lifetime of these new materials is so long that accelerated tests were devised to probe their durability. After a total of more than 67 million high voltage electrical cycles at 100 C, the electrical properties of a copolymer sample remained stable. The test was terminated without any detectable degradation to allow for other experiments. One must be cautious in extrapolating to power cycle performance, but 67 million electrical cycles correspond to 2 years of pyroelectric cycling at 1 Hz. In another series of experiments at reduced temperature and electrical stress, a specimen survived over one-third of a billion electrical cycles during nearly three months of continuous testing. The radiation-limited lifetimes of the copolymer were shown to range from several years to millions of years for most earth orbits. Thus, the pyroelectric copolymer has become a strong candidate for serious consideration for future spacecraft power supplies

Comparative Behavior of \u3ci\u3ePyrellia Cyanicolor\u3c/i\u3e (Diptera: Muscidae) on the Moss \u3ci\u3eSplachnum Ampullaceum\u3c/i\u3e and on Substrates of Nutritional Value

(excerpt) Entomophily is commonly associated with flowering plants and their pollen vectors, but also occurs in other groups of plants. Among fungi, several genera of Phallaceae offer food rewards to calliphorid and muscid flies, which inadvertently disperse the fungal spores (Ingold 1964). Bryhn (1897) first noted a relationship between various species ofDiptera and members of the moss family Splachnaceae. The nature of this interaction has been the subject of much speculation (Bequaert 1921, Erlanson 1935, Crum et aI. 1972, Koponen and Koponen 1977), but no experimental evidence has been collected

A robot hand testbed designed for enhancing embodiment and functional neurorehabilitation of body schema in subjects with upper limb impairment or loss.

Many upper limb amputees experience an incessant, post-amputation "phantom limb pain" and report that their missing limbs feel paralyzed in an uncomfortable posture. One hypothesis is that efferent commands no longer generate expected afferent signals, such as proprioceptive feedback from changes in limb configuration, and that the mismatch of motor commands and visual feedback is interpreted as pain. Non-invasive therapeutic techniques for treating phantom limb pain, such as mirror visual feedback (MVF), rely on visualizations of postural changes. Advances in neural interfaces for artificial sensory feedback now make it possible to combine MVF with a high-tech "rubber hand" illusion, in which subjects develop a sense of embodiment with a fake hand when subjected to congruent visual and somatosensory feedback. We discuss clinical benefits that could arise from the confluence of known concepts such as MVF and the rubber hand illusion, and new technologies such as neural interfaces for sensory feedback and highly sensorized robot hand testbeds, such as the "BairClaw" presented here. Our multi-articulating, anthropomorphic robot testbed can be used to study proprioceptive and tactile sensory stimuli during physical finger-object interactions. Conceived for artificial grasp, manipulation, and haptic exploration, the BairClaw could also be used for future studies on the neurorehabilitation of somatosensory disorders due to upper limb impairment or loss. A remote actuation system enables the modular control of tendon-driven hands. The artificial proprioception system enables direct measurement of joint angles and tendon tensions while temperature, vibration, and skin deformation are provided by a multimodal tactile sensor. The provision of multimodal sensory feedback that is spatiotemporally consistent with commanded actions could lead to benefits such as reduced phantom limb pain, and increased prosthesis use due to improved functionality and reduced cognitive burden

"Time to Bail Out: Alternatives to the Bush-Paulson Plan"

While serving as chairman of the Federal Reserve Board, Alan Greenspan advocated unsupervised securitization, subprime lending, option ARMs, credit-default swaps, and all manner of financial alchemy in the belief that markets "work" to reduce and spread risk, and to allocate it to those best able to assess and bear it--in his view, markets would stabilize in the absence of nasty government intervention. But as Greenspan now admits, he could never have imagined the outcome: a financial and economic crisis of biblical proportions. The problem is, market forces are not stabilizing. Left to their own devices, Wall Street wizards gleefully ran right off the cliff, and took the rest of us with them for good measure. The natural instability of market processes was recognized long ago by John Maynard Keynes, and convincingly updated by Hyman P. Minsky throughout his career. Minsky's theory explained the transformation of the economy over the postwar period from robust to fragile. He pointed his finger at managed money--huge pools of pension funds, hedge funds, sovereign wealth funds, university endowments, money market funds--that are outside traditional banking and therefore largely underregulated and undersupervised. With a large appetite for risk, managed money sought high returns promised by Wall Street's financial engineers, who innovated highly complex instruments that few people understood. In this new Policy Note, President Dimitri B. Papadimitriou and Research Scholar L. Randall Wray take a look back at Wall Street's path to Armageddon, and propose some alternatives to the Bush-Paulson plan to "bail out" both the Street and the American homeowner. Under the existing plan, Treasury would become an owner of troubled financial institutions in exchange for a capital injection--but without exercising any ownership rights, such as replacing the management that created the mess. The bailout would be used as an opportunity to consolidate control of the nation's financial system in the hands of a few large (Wall Street) banks, with government funds subsidizing purchases of troubled banks by "healthy" ones. But it is highly unlikely that relieving banks of some of their bad assets, or injecting some equity into them, will increase their willingness to lend. Resolving the liquidity crisis is the best strategy, the authors say, and keeping small-to-medium-size banks open is the best way to ensure access to credit once the economy recovers. A temporary suspension of the collection of payroll taxes would put more income into the hands of households while lowering the employment costs for firms, fueling spending and employment. The government should assume a more active role in helping homeowners saddled with mortgage debt they cannot afford, providing low-cost 30-year loans directly to all comers; in the meantime, a moratorium on foreclosures is necessary. And federal grants to support local spending on needed projects would go a long way toward rectifying our $1.6 trillion public infrastructure deficit. Can the Treasury afford all these measures? The answer, the authors say, is yes--and it is a bargain if one considers the cost of not doing it. It is obvious that there exist unused resources today, as unemployment rises and factories are idled due to lack of demand. Markets are also voting with their dollars for more Treasury debt. This does not mean the Treasury should spend without restraint--whatever rescue plan is adopted should be well planned and targeted, and of the proper size. The point is that setting arbitrary budget constraints is neither necessary nor desired--especially in the worst financial and economic crisis since the Great Depression.

"Fiddling in Euroland as the Global Meltdown Nears"

President Dimitri B. Papadimitriou and Senior Scholar L. Randall Wray argue that the common diagnosis of a "sovereign debt crisis" ignores the crucial role of rising private debt loads and the significance of current account imbalances within the eurozone. Profligate spending in the periphery is not at the root of the problem. Moreover, pushing austerity in the periphery while ignoring the imbalances within the eurozone is a recipe for deflationary disaster. The various rescue packages on offer for Greece will not ultimately solve the problem, say the authors, and a default is a very real possibility. If a new approach is not embraced, we are likely seeing the end of the European Monetary Union (EMU) as it currently stands. The consequences of a breakup would ripple throughout the EMU as well as the shaky US financial system, and could ultimately trigger the next global financial crisis.

If You Provide It, Will They Read It? The Effect of Information on Choices

This paper investigates the effect of information on respondent's choices in an internet survey for measuring the value of water quality improvements in Deckers Creek (DC) watershed in Monongalia and Peterson Counties of West Virginia, USA. A multiattribute, choice experiment and multinomial logit (MNL) models are used in estimating the marginal utilities of restoring the three attributes of DC: aquatic life, swimming safety, and scenic quality. Response times serve as proxy variables regarding whether respondents read or did not read all the information provided in the survey. Response times fell quickly, but then tapered off as they progressed through the various sections of the survey. Results show that the estimated coefficients of subsamples, read and did not read all the information, were statistically different from each other. Based on log likelihood tests of MNL models, two subsamples of the survey population (read and did not read all information) were found to be from different populations. Estimates of marginal utilities reveal that respondents value aquatic life restoration the highest, followed by scenic quality restoration. Average compensating variation estimates for full restoration of the aquatic life and scenic quality attributes are $9 and$ 6 per month per household, respectively, when the subsamples are pooled. However, the individual subsamples resulted in $5 per month for aquatic life and$3 per month for scenic quality for respondents that read the information, while respondents that did not read the information resulted in statistically higher estimates of $16 and$12, respectively. While respondents' motives for not reading the resource information provided is uncertain, results show their values for watershed restoration are substantially higher than respondents that read the information.Demand and Price Analysis,

"How Can We Provide for the Baby Boomers in Their Old Age?"

The search for the solution to the problems faced by the Social Security system should focus not on how to amend OASDI but on how best to achieve faster long-term economic growth. Achieving such growth is better left to the purview of fiscal and monetary policy, not the OASDI system.

"Are We All Keynesians (Again)?"

It is now widely recognized that economists and policymakers alike had been living a 30-year fantasy. The best government is not that which governs least. The best economy is not that which is abandoned to the invisible fist of the unconstrained market. Our national and individual security is not best left to the fate of the private pursuit of maximum profit. The events of September 11 underscored what was already apparent: Big Government needs to play a bigger role in our economy. Our late Levy Institute colleague Hyman Minsky has been vindicated once more.

Is there the radion in the RS2 model ?

We analyse the physical boundary conditions at infinity for metric fluctuations and gauge functions in the RS2 model with matter on the brane. We argue that due to these boundary conditions the radion field cannot be gauged out in this case. Thus, it represents a physical degree of freedom of the model.Comment: 9 page