"jump drive" has been used in a variety of science fiction to refer to some sort of instant interstellar transportation, presumably though some sort of worm-hole like mechanism. Maybe its only from older scence fiction.
A disk can provide lift, but its less efficient than a conventional wing, which for subsonic does better with a high aspect ratio, and for supersonic flight does better with sharp leading edges and a high sweep angle.
Disks can be used for hypersonic flight - as the Apollo capsules did in the late 60s, but their lift to drag is terrible.
Much as I like spaceX, I hate when companies take well established names for cool things and use them for less cool products.
A "starship" is sell understood to be a craft that travels between stars, not something that can launch a payload to another planet.
Similarly "jump drives" "US robotics" , "hover boards", and the ford "fusion" all are in that category.
The new rock is a heavy-lift rocket. Call it what it is or by some generic name "Neptune", Odin or something. Its cool enough as it is without exaggerating .
I'm amazed any company would take that legal risk. It could be medical - a 1% higher cancer rate 20 years in the future among chipped employees. it could be personal data security when people discover that organizations other than their company are tracking them.
It just seems a huge risk, when biometrics may be as good. Surely no one is claiming that the chips are "impossible to hack".
There are lots of actions that I would fire someone for but which are not crimes.
I donâ(TM)t know the details of any specific case being discussed, but in general harassment does not belong in the workplace for many reasons. Among those is that it drives away talented workers.
Usually when people talk about "cold fusion" they are talking about fusion in room temperature solid state materials. Muonic fusion can happen in room temperature hydrogen so technically it is "cold" fusion, but doesn't really fit the typical model. In any case it looks like there is no way to get out enough energy to make up for what was needed to create the muons in the first place (they stick to the helium atoms) so there is not clear path toward practicality.
Unlike standard "cold fusion" the physics of muonic fusion is well understood.
The physics of fusion is well understood - the combination of temperature, pressure and time needed are known. Plasma fusion machines generally scale to better performance with size, so the question becomes what field configuration meets the net energy generation requirements at the lowest system cost (presumably related to size).
There are some tricks - hot ions fuse, hot electrons just radiate energy, so there are various tricks to keep the ion temperature hot relative to the electron temperature (neutral beam injection, colliding torouses, etc). In the end though it comes down to needing do a very detailed analysis of the various field configurations to understand what works best. This is somewhat limited by the extreme computational difficulty of numerically modeling plasmas.
Its *not* something where a generally smart person can look at a field configuration and decide if it is better.
Implosion fusion is also well understood - need time, pressure, temperature. This again scales better with larger (more expensive) machines. In general these machines are limited by Rayleigh- Taylor instability which causes the compression to not work as well as would naively be expected. Rayleigh taylor is pretty universal - you can see it pouring cream on coffee, or in the crab nebula. Mostly the issue is finding he least expensive driver: lasers, ion beams, etc.
Intermediate solutions, (forming plasmas, then compressing them with magnets, metal jets whatever) combines the two. These are even harder to analyze but its not impossible that one will turn out to be better. Again, this is too complex to just look at and say "that looks like a great idea".
Otherwise muonic fusion is painfully close to working, but still looks impossible. Cold fusion is exceedingly unlikely to work.
I'm happy to see renewed interest in fusion, but it doesn't feel to me like a problem that needs clever ideas - I think its too well understood for that (though I'm happy to be proven wrong).
Conventional encryption is rarely the security limit in real world systems. Much more often it is human factors where there is either an inside job, or a human is tricked by another human into doing something that breaks encryption. "Hi Carl, this is Alice from IT and it looks like the quantum link has de-phased again. Could you help phase it by typing the following into your terminal......."
The technology is interesting, but I don't see a situation where it will actually help.
Considering his much higher position in the company, even a polite "request" could easily be seen as harassment due to the potential for retaliation. Unless the article is lying, "coerced" is a term that implies more than just a request; it would have to include some direct or clearly implied threat.
If he offered her a promotion for sex, that would count as sexual misconduct and harassment. Since the term "coerced" is used, I assume threats of some sort were involved.
Of course if the source is simply lying, we can't believe anything, but I don't see any reason to think that is the case.
Sometimes at large airports, small aircraft pilots will descend at high speed to integrate well with jet traffic. I used to sometimes fly the approach to San Jose in my bonanza at 170 knots ias, or about 200mph.
Airliners tend to arrive faster, so in that case 250mph is not crazy.
Not clear what the chances are of igniting fuel with the presumably shorted / destroyed lithium batteries from the drone. Probably not, but occasionally (rarely) ariliner fuel tanks can be made to explode https://en.wikipedia.org/wiki/...
was a while ago and there have been fixes, but that doesn't mean that its impossible now to blow up fuel tanks.
There are also questions of damage to engines, or cockpit windows.
The data itself could be very valuable - but it can also be badly misused.
I remember when prosecutors claimed that DNA evidence only had a 1 in 6 trillion chance of being wrong. A statement that is wildly wrong for a great many reasons - not the least of which is that crime labs make mistakes far more often than that.
Using genealogy databases that you could have a positive feedback of investigating a related group of people more often, resulting in more convictions, resulting in more investigations. Similar to the way bias can sneak into any justice system.
Since in most cases I assume the suspects DNA would be tested - it may be possible to avoid the above failings, but I'm still uneasy about possible misuse.
It looks like they are using the reverse recover charge in the diode. as an undergrad I though I discovered the effect in 1983, but soon learned that it was well known. (used it to trigger a krytron for a pockels cell driver). (one small diode and inductor to make a KV pulse).
People who do pulse power systems know about a wide variety of tricks.
If they are looking for a fast (ns), high current (~100A, 100V), switches, there are much better tricks these days. We just dusted off an old 1KV, 20A, 100ps rise / fall, 2ns wide pulser we built about 10 years ago (tiny circuit) along with it big brother - 6KV, 120A, 200ps pulser.
This is my strongest (but not only) objection to 2 factor authentication as it is frequently used. The 2nd factor is usually a phone, and nothing seems to keep the company from selling that very valuable information.
The claims about security are largely bogus as the many social hacks around 2 factor authentication have shown.
You understand that. I mostly understand that. The problem is explaining it to someone who doesn't have any technical education. Maybe if society gains experience with the reliability of the system, but that will take a long time and a few high profile exceptions will kill that belief for the whole proces.
We used to have sources that the majority of people believed in. Professors. Clergy, civic leaders. Not saying the trust was deserved, but at least people mostly agreed on facts. (even if they were wrong)
Agreed. The problem is that with photos, video and voice all untrustable, what is left? How can someone come to an independent conclusion about anything?
Politicians will just deny saying things that were caught on video....oh wait....
Sometimes that works, but I generally want a laptop that is small enough to use in a coach airline seat, and that generally means a pretty low performance computer.
I'm working on readout systems for radio telescopes, so I may be developing on my work desktop, but I may have to make some changes from my laptop on site (which could be in an internet-free location). I often work from home and on travel because I rather enjoy my work and because its pretty much expected in this community.
OK, I'm missing somethign (really). You have 40gb, duplicated by 20 people - or 800GB of data . Isn't that about $20 in disk space, $40 if you have backups?
I can see how the bandwidth could be an issue to update everyone, but as long as they are using onedrive for general files, no cache or large databases, (which shold be handled differently), is there really that much bandwidth? If there is, then maybe one drive is the wrong tool for that team.
I find it very convienent to keep all my work and home computers synced so I can work anywhere. That includes being able to work at sites where there is minimal or no internet connectivity. It would be very expensive in my time to carefully plan what files are needed when I have high bandwidth, what are not, and be sure that I didn't make a mistake that left me unable to access an important file at a work site.
Slashdot Mirror
"jump drive" has been used in a variety of science fiction to refer to some sort of instant interstellar transportation, presumably though some sort of worm-hole like mechanism. Maybe its only from older scence fiction.
https://en.wikipedia.org/wiki/...
A disk can provide lift, but its less efficient than a conventional wing, which for subsonic does better with a high aspect ratio, and for supersonic flight does better with sharp leading edges and a high sweep angle.
Disks can be used for hypersonic flight - as the Apollo capsules did in the late 60s, but their lift to drag is terrible.
Much as I like spaceX, I hate when companies take well established names for cool things and use them for less cool products.
A "starship" is sell understood to be a craft that travels between stars, not something that can launch a payload to another planet.
Similarly "jump drives" "US robotics" , "hover boards", and the ford "fusion" all are in that category.
The new rock is a heavy-lift rocket. Call it what it is or by some generic name "Neptune", Odin or something. Its cool enough as it is without exaggerating .
I'm amazed any company would take that legal risk. It could be medical - a 1% higher cancer rate 20 years in the future among chipped employees. it could be personal data security when people discover that organizations other than their company are tracking them.
It just seems a huge risk, when biometrics may be as good. Surely no one is claiming that the chips are "impossible to hack".
There are lots of actions that I would fire someone for but which are not crimes.
I donâ(TM)t know the details of any specific case being discussed, but in general harassment does not belong in the workplace for many reasons. Among those is that it drives away talented workers.
At least in recent human history, when the guys in the boats meet the guys on the shore, it doesn't end well for the guys on the shore.
When we have the technology to travel interstellar distances, I'm happy with the idea of trying to meet new friends.
Usually when people talk about "cold fusion" they are talking about fusion in room temperature solid state materials. Muonic fusion can happen in room temperature hydrogen so technically it is "cold" fusion, but doesn't really fit the typical model. In any case it looks like there is no way to get out enough energy to make up for what was needed to create the muons in the first place (they stick to the helium atoms) so there is not clear path toward practicality.
Unlike standard "cold fusion" the physics of muonic fusion is well understood.
The physics of fusion is well understood - the combination of temperature, pressure and time needed are known. Plasma fusion machines generally scale to better performance with size, so the question becomes what field configuration meets the net energy generation requirements at the lowest system cost (presumably related to size).
There are some tricks - hot ions fuse, hot electrons just radiate energy, so there are various tricks to keep the ion temperature hot relative to the electron temperature (neutral beam injection, colliding torouses, etc). In the end though it comes down to needing do a very detailed analysis of the various field configurations to understand what works best. This is somewhat limited by the extreme computational difficulty of numerically modeling plasmas.
Its *not* something where a generally smart person can look at a field configuration and decide if it is better.
Implosion fusion is also well understood - need time, pressure, temperature. This again scales better with larger (more expensive) machines. In general these machines are limited by Rayleigh- Taylor instability which causes the compression to not work as well as would naively be expected. Rayleigh taylor is pretty universal - you can see it pouring cream on coffee, or in the crab nebula. Mostly the issue is finding he least expensive driver: lasers, ion beams, etc.
Intermediate solutions, (forming plasmas, then compressing them with magnets, metal jets whatever) combines the two. These are even harder to analyze but its not impossible that one will turn out to be better. Again, this is too complex to just look at and say "that looks like a great idea".
Otherwise muonic fusion is painfully close to working, but still looks impossible. Cold fusion is exceedingly unlikely to work.
I'm happy to see renewed interest in fusion, but it doesn't feel to me like a problem that needs clever ideas - I think its too well understood for that (though I'm happy to be proven wrong).
Conventional encryption is rarely the security limit in real world systems. Much more often it is human factors where there is either an inside job, or a human is tricked by another human into doing something that breaks encryption.
"Hi Carl, this is Alice from IT and it looks like the quantum link has de-phased again. Could you help phase it by typing the following into your terminal......."
The technology is interesting, but I don't see a situation where it will actually help.
Considering his much higher position in the company, even a polite "request" could easily be seen as harassment due to the potential for retaliation. Unless the article is lying, "coerced" is a term that implies more than just a request; it would have to include some direct or clearly implied threat.
If he offered her a promotion for sex, that would count as sexual misconduct and harassment. Since the term "coerced" is used, I assume threats of some sort were involved.
Of course if the source is simply lying, we can't believe anything, but I don't see any reason to think that is the case.
Birds are softer and lower density. I've hit a bird and the damage was pretty minimal. This was at 180-200mph (don't quite remember)
Sometimes at large airports, small aircraft pilots will descend at high speed to integrate well with jet traffic. I used to sometimes fly the approach to San Jose in my bonanza at 170 knots ias, or about 200mph.
Airliners tend to arrive faster, so in that case 250mph is not crazy.
Not clear what the chances are of igniting fuel with the presumably shorted / destroyed lithium batteries from the drone. Probably not, but occasionally (rarely) ariliner fuel tanks can be made to explode
https://en.wikipedia.org/wiki/...
was a while ago and there have been fixes, but that doesn't mean that its impossible now to blow up fuel tanks.
There are also questions of damage to engines, or cockpit windows.
I also don't want to down small planes either.
The data itself could be very valuable - but it can also be badly misused.
I remember when prosecutors claimed that DNA evidence only had a 1 in 6 trillion chance of being wrong. A statement that is wildly wrong for a great many reasons - not the least of which is that crime labs make mistakes far more often than that.
Using genealogy databases that you could have a positive feedback of investigating a related group of people more often, resulting in more convictions, resulting in more investigations. Similar to the way bias can sneak into any justice system.
Since in most cases I assume the suspects DNA would be tested - it may be possible to avoid the above failings, but I'm still uneasy about possible misuse.
It looks like they are using the reverse recover charge in the diode. as an undergrad I though I discovered the effect in 1983, but soon learned that it was well known. (used it to trigger a krytron for a pockels cell driver). (one small diode and inductor to make a KV pulse).
People who do pulse power systems know about a wide variety of tricks.
If they are looking for a fast (ns), high current (~100A, 100V), switches, there are much better tricks these days. We just dusted off an old 1KV, 20A, 100ps rise / fall, 2ns wide pulser we built about 10 years ago (tiny circuit) along with it big brother - 6KV, 120A, 200ps pulser.
This is my strongest (but not only) objection to 2 factor authentication as it is frequently used. The 2nd factor is usually a phone, and nothing seems to keep the company from selling that very valuable information.
The claims about security are largely bogus as the many social hacks around 2 factor authentication have shown.
Because we want to be sure that we know what person the surveillance devices are watching.
The real question is why we need so many miscelaneous devices connected to the internet with with anything more than a one-way data link.
You understand that. I mostly understand that. The problem is explaining it to someone who doesn't have any technical education. Maybe if society gains experience with the reliability of the system, but that will take a long time and a few high profile exceptions will kill that belief for the whole proces.
We used to have sources that the majority of people believed in. Professors. Clergy, civic leaders. Not saying the trust was deserved, but at least people mostly agreed on facts. (even if they were wrong)
Agreed. The problem is that with photos, video and voice all untrustable, what is left? How can someone come to an independent conclusion about anything?
Politicians will just deny saying things that were caught on video....oh wait....
It really is a serious issue.
True, but then the analysis falls to believing experts arguing over whether or not there was tampering
It makes me feel so much better that a large corporation is going to determine truth vs falsehood of information.
Actually it would be OK if they had a purely technical measure of whether or not images or videos had been manipulated.
Sometimes that works, but I generally want a laptop that is small enough to use in a coach airline seat, and that generally means a pretty low performance computer.
I'm working on readout systems for radio telescopes, so I may be developing on my work desktop, but I may have to make some changes from my laptop on site (which could be in an internet-free location). I often work from home and on travel because I rather enjoy my work and because its pretty much expected in this community.
OK, I'm missing somethign (really). You have 40gb, duplicated by 20 people - or 800GB of data . Isn't that about $20 in disk space, $40 if you have backups?
I can see how the bandwidth could be an issue to update everyone, but as long as they are using onedrive for general files, no cache or large databases, (which shold be handled differently), is there really that much bandwidth? If there is, then maybe one drive is the wrong tool for that team.
I find it very convienent to keep all my work and home computers synced so I can work anywhere. That includes being able to work at sites where there is minimal or no internet connectivity. It would be very expensive in my time to carefully plan what files are needed when I have high bandwidth, what are not, and be sure that I didn't make a mistake that left me unable to access an important file at a work site.