Compare to the Skylon; this is a great idea, as it provides a completely reusable first stage and eliminates the need for a launch tower.
(via Cosmic Conservative)
To reduce unemployment, the economy must create enough new jobs to absorb entrants into the labor market and the existing out-of-work. Shierholz has calculated how many jobs would be needed to lower unemployment (9.1 percent in August) to 5 percent over five years. Her estimate: 16.9 million. That's an average of 282,000 jobs a month. The trouble is that this rate of job creation far exceeds the present level (105,000 a month since early 2010) or even the level (240,000) achieved during the boom between 1993 and 2000.(via Instapundit)
You can tinker with Shierholz's assumptions, but the main conclusion doesn't change. Even with rapid job growth, unemployment will descend slowly. With sluggish growth -- or another recession -- it may remain high indefinitely. There are no quick fixes. Unemployment will increasingly define our economic prospects and politics.
...Still, high joblessness' harshest effects fall on the jobless. "We're creating a bifurcated society," worries Harvard economist Lawrence Katz. "We're talking about a lost generation of younger workers and displaced workers." Younger workers have a harder time starting careers. Because many skills are developed on the job, long unemployment spells can lower lifetime earnings.
How to get out of this fix? Certainly the easiest solution in the short run would be for Congress to pass the one sentence of legislation required to raise the debt ceilingThe debt ceiling has nothing whatsoever to do with whether the US defaults or not. The only trigger for a default is nonpayment of interest on the debt. When Obama talks about default, that's what he's talking about - vetoing a payment of the interest on the debt.
It disappoints when a speaker says something like this.. it fills you with inspiration for about five seconds, only to have the nagging rational part of your brain chime in with: umm, excuse me? That's not actually true, ya know. I think kids who are inspired by such speakers to follow their dreams will feel terrible betrayal when they eventually discover they've been lied to.In the comments section Dr. GeGrasse Tyson defended what he said, but I think Trent's point still stands: spinoffs are not a justification for a space program.
The most famous golem narrative involves Judah Loew ben Bezalel, the late 16th century chief rabbi of Prague, also known as the Maharal, who reportedly created a golem to defend the Prague ghetto from anti-Semitic attacks and pogroms. Depending on the version of the legend, the Jews in Prague were to be either expelled or killed under the rule of Rudolf II, the Holy Roman Emperor. To protect the Jewish community, the rabbi constructed the Golem out of clay from the banks of the Vltava river, and brought it to life through rituals and Hebrew incantations. As this golem grew, it became increasingly violent, killing gentiles and spreading fear. A different story tells of a golem that fell in love, and when rejected, became the violent monster seen in most accounts. Some versions have the golem eventually turning on its creator or attacking other Jews.The Zombie - no, not the Night of the Living Dead type, the Haitian voodoo kind - is a similar cultural expression of this desire for (partial) human intelligence animating human bodies. In both the cases of the Golem (an artificial creature) and the Haitian Zombie (a person enslaved through artificial chemical means and cultural expectations) the desire for control of a portion of human-like intelligence to perform tasks is evident.
...an infinite memory capacity obtained in the form of an infinite tape marked out into squares, on each of which a symbol could be printed. At any moment there is one symbol in the machine; it is called the scanned symbol. The machine can alter the scanned symbol and its behavior is in part determined by that symbol, but the symbols on the tape elsewhere do not affect the behavior of the machine. However, the tape can be moved back and forth through the machine, this being one of the elementary operations of the machine. Any symbol on the tape may therefore eventually have an innings.Although the physical details are different, the description is identical to the operation of any computer today. Instead of a physical tape being fed through the machine, a memory address is polled and the resulting "symbol" consists of a pattern of low and high voltages on wires, what we think of as the Zeros and Ones in a byte.
Thank-you for taking the time to look at Nautilus and to post the presentation on your site. [I have attached a slightly updated version; there has been some file corruption from multiple downloads]
I apologize for not responding sooner, but for some I/T reason a great many emails have been directed to the Server SPAM file; I now check it regularly.
A great deal of "detail" information is not contained in the presentation. This was by design; it was crafted to be an oral presentation with much of the technical content addressed by the speaker, who directly answers audience questions and can therefore better engage the particular interest(s) of various groups. What you have viewed is the Concept "Sales" package - it attempts to paint a picture that folks might want to find out more about. So questions, observations, critiques, no matter on what subject - and as long as they are more-or-less civil in tone, are all welcomed. If a dialog results, well then --- yahoo!
Your questions about thermal considerations are spot on. While in LEO [construction phase],the classic basting roll maneuver would likely be employed. But transit to L1, and at L1 require a different solution. Most folks don't notice the lack of thermal rejection capability in the Concept images; they are usually taken aback at the general (size) and odd structural manifestation that good engineering details are not usually assessed. Thermal load/rejection and management at L1 will be different than at LEO, will be different than during a CIS-Lunar route [repeated], and definitely different than for an inner Solar System junket[trek...I wanted to avoid that term]. So yes, Thermal management is a major technical consideration that has a couple of nifty solutions that are being pursued. One of the inflatables will have a decidedly green element associated with it....[think Silent Running w/ Bruce Dern]. It is a partial thermal shunt, not the complete solution. Radiators will still be required, along with some new Variable Conducting Heat-Pipes that the old Hughes Aircraft Corporation had utilized.
The "Winnebago" section is new-think applied to the design success of the Apollo LEM. The Lunar Excursion Module is THE most successful spacecraft ever built. Purely and completely a space-craft that journeys in the Space environment. I purposefully exclude ISS, as it is essentially a static platform. Many of its design factors were constrained by the method of its construction --- Orbiter delivery with on-orbit assembly. The OV payload bay is incredible, but it does have both constraints and strong limitations [I am from the SSP]. With that understood, Nautilus design knowingly departed from ortho/iso-grid cylinder construction to embrace the lessons learned from the Grumman "flat-panel" LEM. Load path negotiation was a nightmare back then, and early NASTRAN was an indication of a trend, not even remotely considered an absolute.
The addition of what is called the "exo-truss" to the entire vehicle, for managing and transmitting the Propulsion Pod(s) thrust(and Isp), will give Nautilus sufficient structural integrity. We also hope for hefty a natural frequency so that the Centrifuge can become a positive input into the overall GN&C design.
I hope this helps answer of few of your questions. If nothing else, it is hoped that Nautilus-X is utilized as a development tool/mechanism for good System(s) engineering design and produces some decent axioms for large, long-duration spacecraft design. But it is something of a nifty Concept....
Temperature changes recorded in the GISP2 ice core from the Greenland Ice Sheet show that the magnitude of global warming experienced during the past century is insignificant compared to the magnitude of the profound natural climate reversals over the past 25,000 years, which preceded any significant rise of atmospheric CO2. If so many much more intense periods of warming occurred naturally in the past without increase in CO2, why should the mere coincidence of a small period of low magnitude warming this century be blamed on CO2?So that about does it for anthropogenic global warming.