In space, you have nothing to use. Many of the quoted nuclear projects still require carrying an exhaustible, explosive, material (eg oxygen, water, hydrogen) when the real goal of a space craft is propulsion by the nuclear reaction itself, with no other materials.
Of course you need reaction mass, so unless your design is one where the reactor fuel itself is spat out the back (NSWR, fission fragment,...), yeah, you need reaction mass. You're not talking about nonsense reactionless drives are you? This is the real world, where we need reactions.
We are not at a stage in spaceflight that allows us to rescue a space craft. The shuttles are out of commission.
Why is the Space Shuttle required to perform a rescue operation? Actually, why would you use the Space Shuttle to perform a rescue operation? That thing only had a few hundred m/s of maneuverability once it made orbit.
And NTR is more than double the efficiency of chemical, so quite a bit better.
Solid core NTR has roughly double the specific impulse of the best (practical) chemical rockets, but you lose it all in tankage for that liquid hydrogen. If you try to use something easier to store, it's going to be heavier, and your specific impulse suffers significantly.
In addition, Rei mentions the new idea of adding LOX initially to burn the super heated LH2 to provide a big kick. That actually makes sense.
I don't know if you could call that a new idea. It certainly seems a fairly obvious one, and it's one I've heard many times before. The "afterburner" running on "superheated" hydrogen really doesn't get you any more performance than a traditional hydrolox chemical rocket would. What it does get you is not having to build two separate engines to get a higher thrust engine. You can reuse all the existing turbomachinery to save weight. What it also gets you is an extra pump tied to your expander turbine, a whole bunch of plumbing, more tankage, and an overengineered thrust chamber and nozzle that now has to withstand combustion temperatures.
If you need the extra thrust for quick transit through radiation belts, you're better off either adding an expendable kick motor, or just staging your mission above the belts.
was a series of movable doors that opened and closed as the train moved through the tunnel
That would never fly in the real world. Now all that air you let in has to be pumped out down to the level of a hard vacuum.. What moronic design are you reading?
Maybe one of the original designs from the 1800s, operating on the same principles of pneumatic tubes? Just ignore those pumping losses...
I'm honestly surprised they don't dock themselves right now, at least in a secured yard at a large facility. Counter to the above example, there is no unpredictable traffic, and there's plenty of room. The math to calculate a docking maneuver isn't tough, especially at a known, mapped facility, where you can trench guide wire or broadcast local navigation.
Have the driver drop the trailer off at a gate, and a cabless electric tug picks it up and takes it to storage or a door. The biggest complication is coming up with some mechanism to manage the brake lines.
Depends on the carrier, and even from region to region. Some people would get everything but the premiums, some would get nothing. Even more annoying, broadcast TV had a copy protection flag in the spec, that was never implemented on broadcast receivers... except it shows up and is active on cablecard equipment, meaning you can be blocked from recording broadcast television.
I've not paid attention to this in several years, so it may be the whole industry has shifted to copy-once/never, which activates full DRM.
Transmitting everything ClearQAM is stupid. They would have to structure their system so that no two packages used the same channel, and then install hardware filters for each subscriber at the pole. It would take weeks to get a tech out to change your subscription, and it would be a massive, pointless hardware overhead.
There's no problem with conditional access systems, and there's no problem with CableCard when it is used as a simple conditional access system. The tuner feeds encrypted data into the card, and the card feeds unencrypted data back to the system. No expensive hardware filters, easy management of subscriptions, free and clear access to everything you're paying for. Everyone is happy, except for the pirates wanting to steal cable, and the content providers who don't want subscribers to have free and clear access to their rightfully purchased content.
CableCard is only a problem when it actually invokes its DRM capabilities, and because of the expensive certification process it requires of authorized hardware to uphold its DRM capabilities.
Funded and built for a certain capacity and maintenance schedule. Side streets are not built for heavy traffic flow and they require more frequent maintenance if they are used that way. It's not just a homeowner issue - it's a city planning and infrastructure issue.
That's bullshit. Weather and heavy vehicle traffic are what cause roadway deterioration. A whole year's worth of car traffic on a residential street doesn't equal the damage done by a few passes of a plow truck, heavily loaded with brine that it's spewing onto the surface.
The machine she was working on was not the one that crushed her. This sounds more like bad industrial design, that allowed one robotic arm to reach into another work area. Either they should have been separated further, or they should have been energized through overlapping lockouts.
I guess you've watched too many movies with stuff magically freezing in outer space. Objects in space are actually very slow to lose heat because vacuum doesn't conduct heat.
Objects in space are very quick to lose heat, when initially exposed to the vacuum, due to all the evaporation.
Any worthwhile speed test is going to run for tens of seconds, and potentially chew through several hundred MB of data. To be fair, that's still nothing.
The whole space station doesn't need to rotate in order to create artificial gravity. Just keep the living quarters in the rotating bit and the experiment areas in the none rotating bit.
It's not that simple. If you're rotating on a small radius, you're going to have a noticeable difference in apparent gravity between your feet and your head. Just as we don't know what long duration low gravity does to the human body, we don't know what long duration tidal gravity will do. If you're rotating on a large radius, well now you've got to construct this huge, high strength station. Now obviously, the only way we're ever going to find out is to throw something into orbit, and spend several years manning the thing, but the problem is a complex and not well understood one.
The hard part is probably trying to keep one area stationary while the other rotates. That's going to require something rotating in the opposite direction to cancel out any momentum.
Why do you have to cancel out any momentum? Why can the station not have a non-zero rotational momentum? Tons of satellites do.
SAP was unable to deliver this. Because SAP is really shitty.
Why would they bother? They can apparently let you spend the money and effort developing it, and still charge you seat licenses when it's all done anyway. Sounds like a win-win for them.
If the MRI test falsely diagnoses children without autism as being autistic 20% of the time, then roughly 90% of all people who test positive will not be autistic.
According to the abstract, only 12% of those tested positive were not later diagnosed as autistic. You're just making argument over nonsense numbers, when the real numbers are available.
The problem with drive-by-wire is that people are afraid of it. There was never any verified evidence of fault within the Toyota electronic throttle, and all cases of unintended acceleration were attributed to either operator error, or physical fault in the pedal itself.
Cross breeding and selective breeding aren't genetic modification
They are, you are just assuming that there is a silent "direct" or "artificial" inside the phrase "genetic modification". That's kind of expected since this stuff tends to get discussed in emotive instead of rational terms.
Selective breeding could be considered artificial genetic modification. Intentional irradiation as a stressor could be considered direct genetic modification.
That's because you are letting the rules of nature determine the outcome. People have been cross breeding for thousands of years and we know what to expect.
That's completely false. We've only had the slightest inkling of what to expect for the past 150 years, and we've only really started to know what we were doing in the last 30. For thousands of years, we we just blindly mixing like with like and hoping for the best, with no predictive understanding of what was actually going on under the surface. The old methods were slow, in multiple definitions of the term. "Slow" and "safe" are not synonymous.
Slashdot Mirror
In space, you have nothing to use. Many of the quoted nuclear projects still require carrying an exhaustible, explosive, material (eg oxygen, water, hydrogen) when the real goal of a space craft is propulsion by the nuclear reaction itself, with no other materials.
Of course you need reaction mass, so unless your design is one where the reactor fuel itself is spat out the back (NSWR, fission fragment, ...), yeah, you need reaction mass. You're not talking about nonsense reactionless drives are you? This is the real world, where we need reactions.
We are not at a stage in spaceflight that allows us to rescue a space craft. The shuttles are out of commission.
Why is the Space Shuttle required to perform a rescue operation? Actually, why would you use the Space Shuttle to perform a rescue operation? That thing only had a few hundred m/s of maneuverability once it made orbit.
And NTR is more than double the efficiency of chemical, so quite a bit better.
Solid core NTR has roughly double the specific impulse of the best (practical) chemical rockets, but you lose it all in tankage for that liquid hydrogen. If you try to use something easier to store, it's going to be heavier, and your specific impulse suffers significantly.
In addition, Rei mentions the new idea of adding LOX initially to burn the super heated LH2 to provide a big kick. That actually makes sense.
I don't know if you could call that a new idea. It certainly seems a fairly obvious one, and it's one I've heard many times before. The "afterburner" running on "superheated" hydrogen really doesn't get you any more performance than a traditional hydrolox chemical rocket would. What it does get you is not having to build two separate engines to get a higher thrust engine. You can reuse all the existing turbomachinery to save weight. What it also gets you is an extra pump tied to your expander turbine, a whole bunch of plumbing, more tankage, and an overengineered thrust chamber and nozzle that now has to withstand combustion temperatures.
If you need the extra thrust for quick transit through radiation belts, you're better off either adding an expendable kick motor, or just staging your mission above the belts.
That would never fly in the real world. Now all that air you let in has to be pumped out down to the level of a hard vacuum.. What moronic design are you reading?
Maybe one of the original designs from the 1800s, operating on the same principles of pneumatic tubes? Just ignore those pumping losses...
Linear Induction Motor
I'm honestly surprised they don't dock themselves right now, at least in a secured yard at a large facility. Counter to the above example, there is no unpredictable traffic, and there's plenty of room. The math to calculate a docking maneuver isn't tough, especially at a known, mapped facility, where you can trench guide wire or broadcast local navigation.
Have the driver drop the trailer off at a gate, and a cabless electric tug picks it up and takes it to storage or a door. The biggest complication is coming up with some mechanism to manage the brake lines.
Quantum cloud computing? You can't actually tell if the service is running, but at least you no longer have to reboot it yourself...
Depends on the carrier, and even from region to region. Some people would get everything but the premiums, some would get nothing. Even more annoying, broadcast TV had a copy protection flag in the spec, that was never implemented on broadcast receivers... except it shows up and is active on cablecard equipment, meaning you can be blocked from recording broadcast television.
I've not paid attention to this in several years, so it may be the whole industry has shifted to copy-once/never, which activates full DRM.
Transmitting everything ClearQAM is stupid. They would have to structure their system so that no two packages used the same channel, and then install hardware filters for each subscriber at the pole. It would take weeks to get a tech out to change your subscription, and it would be a massive, pointless hardware overhead.
There's no problem with conditional access systems, and there's no problem with CableCard when it is used as a simple conditional access system. The tuner feeds encrypted data into the card, and the card feeds unencrypted data back to the system. No expensive hardware filters, easy management of subscriptions, free and clear access to everything you're paying for. Everyone is happy, except for the pirates wanting to steal cable, and the content providers who don't want subscribers to have free and clear access to their rightfully purchased content.
CableCard is only a problem when it actually invokes its DRM capabilities, and because of the expensive certification process it requires of authorized hardware to uphold its DRM capabilities.
Hardware key loggers are a thing...
publicly funded streets
Funded and built for a certain capacity and maintenance schedule. Side streets are not built for heavy traffic flow and they require more frequent maintenance if they are used that way. It's not just a homeowner issue - it's a city planning and infrastructure issue.
That's bullshit. Weather and heavy vehicle traffic are what cause roadway deterioration. A whole year's worth of car traffic on a residential street doesn't equal the damage done by a few passes of a plow truck, heavily loaded with brine that it's spewing onto the surface.
The machine she was working on was not the one that crushed her. This sounds more like bad industrial design, that allowed one robotic arm to reach into another work area. Either they should have been separated further, or they should have been energized through overlapping lockouts.
What kind of sensors and processing are you using that update the full scene every microsecond?
What happened? I blacked out.
I guess you've watched too many movies with stuff magically freezing in outer space. Objects in space are actually very slow to lose heat because vacuum doesn't conduct heat.
Objects in space are very quick to lose heat, when initially exposed to the vacuum, due to all the evaporation.
Everyone uses it, every time you have to do more with the temperature than simply knowing what it is.
Any worthwhile speed test is going to run for tens of seconds, and potentially chew through several hundred MB of data. To be fair, that's still nothing.
And why in the world does that mean your job is safe?
Eventually, robots will program themselves...
... and when that happens, we're all out of a job.
The whole space station doesn't need to rotate in order to create artificial gravity. Just keep the living quarters in the rotating bit and the experiment areas in the none rotating bit.
It's not that simple. If you're rotating on a small radius, you're going to have a noticeable difference in apparent gravity between your feet and your head. Just as we don't know what long duration low gravity does to the human body, we don't know what long duration tidal gravity will do. If you're rotating on a large radius, well now you've got to construct this huge, high strength station. Now obviously, the only way we're ever going to find out is to throw something into orbit, and spend several years manning the thing, but the problem is a complex and not well understood one.
The hard part is probably trying to keep one area stationary while the other rotates. That's going to require something rotating in the opposite direction to cancel out any momentum.
Why do you have to cancel out any momentum? Why can the station not have a non-zero rotational momentum? Tons of satellites do.
SAP was unable to deliver this. Because SAP is really shitty.
Why would they bother? They can apparently let you spend the money and effort developing it, and still charge you seat licenses when it's all done anyway. Sounds like a win-win for them.
If the MRI test falsely diagnoses children without autism as being autistic 20% of the time, then roughly 90% of all people who test positive will not be autistic.
According to the abstract, only 12% of those tested positive were not later diagnosed as autistic. You're just making argument over nonsense numbers, when the real numbers are available.
If you want to channel a lot of energy in a short period of time at a surface, you can't beat a rocket.
Well that, or explosives...
The problem with drive-by-wire is that people are afraid of it. There was never any verified evidence of fault within the Toyota electronic throttle, and all cases of unintended acceleration were attributed to either operator error, or physical fault in the pedal itself.
They are, you are just assuming that there is a silent "direct" or "artificial" inside the phrase "genetic modification". That's kind of expected since this stuff tends to get discussed in emotive instead of rational terms.
Selective breeding could be considered artificial genetic modification. Intentional irradiation as a stressor could be considered direct genetic modification.
That's because you are letting the rules of nature determine the outcome. People have been cross breeding for thousands of years and we know what to expect.
That's completely false. We've only had the slightest inkling of what to expect for the past 150 years, and we've only really started to know what we were doing in the last 30. For thousands of years, we we just blindly mixing like with like and hoping for the best, with no predictive understanding of what was actually going on under the surface. The old methods were slow, in multiple definitions of the term. "Slow" and "safe" are not synonymous.
CVG expansion plans say Amazon is going to be building in the field west of DHL's facility, as well as the infield between runways 36C and 36L.