Cunjo Carl Posted March 15, 2019 Share Posted March 15, 2019 42 minutes ago, kerbiloid said: Say, we have SETI. How can we insult/offend an extraterrestrial civilization to make them send a fleet here? (Unlikely we can use harsh words, gestures, or anything biology-related, as we have no idea what are biological and social normality for them.) Spoiler " 1 ... 2 ... 3 ... 5 ... 7 ... 11 ... 12 ... 13 ... 14 ... 15 ... " Quote Link to comment Share on other sites More sharing options...
Green Baron Posted March 15, 2019 Share Posted March 15, 2019 (edited) Spoiler Or: § ... Ö ... k ... * ... @ ... ß$ ... ßÖ ... ßk ... ß# ... ß* ... Edited March 15, 2019 by Green Baron Quote Link to comment Share on other sites More sharing options...
DDE Posted March 15, 2019 Share Posted March 15, 2019 53 minutes ago, Gargamel said: If the carrier is big enough, no modifications are necessary. Please. While it IS possible land nearly anything on a carrier if you're willing to have no payload and cease all other operations on deck... ...dedicated carrier aircraft receive massive enhancements for improved low-speed handling, about 30% more structural mass, and, most obviously, a tail hook. Note that these exotic landings and takeoffs use the entire length of the aircraft carrier... which is not how you go about deploying and recovering 90 or so combat aircraft. Quote Link to comment Share on other sites More sharing options...
Gargamel Posted March 15, 2019 Share Posted March 15, 2019 1 minute ago, DDE said: Please. While it IS possible land nearly anything on a carrier if you're willing to have no payload and cease all other operations on deck My point is, the OP of the question never specified what carrier we were talking about. We're not going to land that U2 on a Hornet now are we? Or even get an F18 to take off from a marine assault craft. But, if you make a carrier big enough. you could easily land anything you want on it. So the question itself is flawed, not the answer. Quote Link to comment Share on other sites More sharing options...
cubinator Posted March 15, 2019 Share Posted March 15, 2019 When was Jupiter named, and why was the name chosen? It seems weirdly coincidental that the planet was named after the king of the gods before we had any idea it was actually the largest planet. And Venus is brighter most of the time. Quote Link to comment Share on other sites More sharing options...
adsii1970 Posted March 15, 2019 Share Posted March 15, 2019 2 minutes ago, Gargamel said: My point is, the OP of the question never specified what carrier we were talking about. We're not going to land that U2 on a Hornet now are we? Or even get an F18 to take off from a marine assault craft. But, if you make a carrier big enough. you could easily land anything you want on it. So the question itself is flawed, not the answer. And don't forget, the U.S. Navy officially has CVN (Carrier Vehicle Nuclear) and there are currently 10 active aircraft carriers, 1 in reserve, and 1 currently at "sea trials" with three more under construction. The U.S. Navy also has another carrier designation CVE (Carrier Vehicle Escort) Escort Aircraft Carriers. Although this designation began in the early years of World War II, it is still an active (and planned) classification. The last one, CVE-107 U.S.S. Gilbert Islands was decommissioned in 1979. Technically, what @Gargamel is talking about is NOT an aircraft carrier by designation, but a LHD ( Landing Helicopter Dock amphibious assault ship). These are capable of transporting almost the full strength of a United States Marine Corps Marine Expeditionary Unit, and landing them in hostile territory via landing craft or helicopters as well as providing air support via AV-8B Harrier II attack aircraft or F-35B Lightning II stealth strike-fighters. Yeah, U.S. Navy history is a hobby of mine... Quote Link to comment Share on other sites More sharing options...
DDE Posted March 15, 2019 Share Posted March 15, 2019 29 minutes ago, Gargamel said: My point is, the OP of the question never specified what carrier we were talking about. We're not going to land that U2 on a Hornet now are we? Or even get an F18 to take off from a marine assault craft. But, if you make a carrier big enough. you could easily land anything you want on it. So the question itself is flawed, not the answer. Yeah, and pigs can fly! Quote Link to comment Share on other sites More sharing options...
adsii1970 Posted March 15, 2019 Share Posted March 15, 2019 34 minutes ago, DDE said: Yeah, and pigs can fly! If you give it enough thrust, yes, a pig can fly... Quote Link to comment Share on other sites More sharing options...
Lisias Posted March 15, 2019 Share Posted March 15, 2019 (edited) 1 hour ago, DDE said: Yeah, and pigs can fly! 2 hours ago, adsii1970 said: No, write a program that rewrites their computer systems and replaces it with Windows 10, subjecting them to the fun of Windows Updater. Guarantee they'd show up... in a rather angry mood... If they use Windows in their carriers, they should be stranded half way to here by now! Spoiler On a side note… I think that rick-rolling them will do the trick. =P Edited March 15, 2019 by Lisias The Trick Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 16, 2019 Share Posted March 16, 2019 http://prikol.bigmir.net/view/32771 Quote Link to comment Share on other sites More sharing options...
wumpus Posted March 16, 2019 Share Posted March 16, 2019 16 hours ago, Lisias said: If they use Windows in their carriers, they should be stranded half way to here by now! In 1998 the USS Yorktown had plenty of Windows NT boxes running the ship, and NT being NT decided to leave them dead in the water. I'm not sure you can suggest installing a Microsoft operating system on a US Navy vessel to this day. Since this was right around when Lockheed had to turn of their networks as the level of use by hostile software (the Melisa virus or similar) by Windows machines, I can't imagine why anyone would have put anything they cared about on a Windows system. I'm not sure that state-supported computer hacking started then, but it should have been obvious just how indifferent US military contractors were to computer security. Quote Link to comment Share on other sites More sharing options...
DDE Posted March 16, 2019 Share Posted March 16, 2019 4 hours ago, wumpus said: In 1998 the USS Yorktown had plenty of Windows NT boxes running the ship, and NT being NT decided to leave them dead in the water. I'm not sure you can suggest installing a Microsoft operating system on a US Navy vessel to this day. Since this was right around when Lockheed had to turn of their networks as the level of use by hostile software (the Melisa virus or similar) by Windows machines, I can't imagine why anyone would have put anything they cared about on a Windows system. I'm not sure that state-supported computer hacking started then, but it should have been obvious just how indifferent US military contractors were to computer security. Apparently, the Royal Navy ended up with some Windows-based torpedo fire control systems in the 2000s. As to state-sponsored hacking, the Equation Group registered some of their servers in 1996, and Kaspersky imply they’ve seen a Regin sample dated 1999. Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 16, 2019 Share Posted March 16, 2019 6 hours ago, wumpus said: I can't imagine why anyone would have put anything they cared about on a Windows system. Probably you would be shocked reading about systems used in ATM (the trade machine that sells money). Quote Link to comment Share on other sites More sharing options...
DDE Posted March 16, 2019 Share Posted March 16, 2019 1 hour ago, kerbiloid said: Probably you would be shocked reading about systems used in ATM (the trade machine that sells money). It’s not the OS that’s usually the problem. https://securelist.com/atm-malware-from-latin-america-to-the-world/83836/ https://securelist.com/atm-malware-is-being-sold-on-darknet-market/81871/ Quote Link to comment Share on other sites More sharing options...
wumpus Posted March 17, 2019 Share Posted March 17, 2019 4 hours ago, kerbiloid said: Probably you would be shocked reading about systems used in ATM (the trade machine that sells money). It's a lot better, but I wouldn't try to convince a US Navy Captain to try to run his ship on windows. I'm not sure how they managed to solve the "UAC is triggered by *everything*" issue, as far as I know nearly everything it was originally triggered (back when everything triggered it) was almost impossible to determine whether or not you were doing something dangerous. Windows (NT and before) had some spectacularly insecure assumptions (and worse things were piled on that) and Microsoft had a hard choice to dump backward compatibility or try to keep it and attempt to limit the damage from what appeared to be a hopelessly insecure API. Somehow they seemed to have fixed things (more or less. Cryptolocking was a thing, but Windows hardly is the festering pool of malware you find in Android). Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 17, 2019 Share Posted March 17, 2019 (edited) 3 hours ago, wumpus said: Windows (NT and before) had some spectacularly insecure assumptions NT4 was much better than previous Windowses, and was widely used everywhere. 3 hours ago, wumpus said: UAC is triggered by *everything Afaik, UAC has appeared after XP. Probably in Vista. And its security problems mostly depend on sysadmin skills. (Unlike XP where the user rights management is limited by design, even compared to the earlier 2000). Linux would be same bad, because it's not a real-time system as well. Just *nixes are less virus-friendly. Time-critical parts should be managed by real-time systems, like QNX. Windows and Linux are fine for everything other. P.S. And may Acronis bless you all. 7 hours ago, DDE said: It’s not the OS that’s usually the problem +1 OS is the least of their problems. Luckily, people really believe that their cards are in good hands. Edited March 17, 2019 by kerbiloid Quote Link to comment Share on other sites More sharing options...
YNM Posted March 22, 2019 Share Posted March 22, 2019 On 3/15/2019 at 3:17 PM, kerbiloid said: insult/offend Depends on how messed up the other civilization is. If it's as messed up as ours, it doesn't take much. On 3/16/2019 at 4:37 PM, kerbiloid said: Probably you would be shocked reading about systems used in ATM. I happily run Win7. If it was possible I'd run XP, but it's difficult finding XP 64-bit that's stable. Quote Link to comment Share on other sites More sharing options...
YNM Posted March 22, 2019 Share Posted March 22, 2019 Anyway, sorry for the double post : Does anyone knows better about this : https://eartharxiv.org/d46xj/ Spoiler Key Points: In May 2018 a seismic crisis started offshore, east of Mayotte, Comoros islands, including the largest event ever recorded in the Comoros. The crisis was originally monitored with a sparse network of local accelerometers and regional broadband stations that was gradually completed. Although no magma emissions was observed directly, the volcanic nature of the crisis is supported by the displacements patterns of the permanent GNSS stations of Mayotte and by the occurrence of episodic low frequency tremors. We present a model to interpret, at the first order, the spatiotemporal evolution of the seismological and geodetic data during the first six months of the crisis. The seismological and geodetic data allow to discriminate and characterize the initial fracturing phase, the phase of magma intrusion from depth to the subsurface, and the eruptive phase that starts in early July, fifty days after the first seismic events. The inferred deflation source is at a depth of 28 km, and the volume involved during the first six months is larger than 1 km3. In terms of volume and depth of the source, this might be the largest offshore volcanic event ever documented. Quote Link to comment Share on other sites More sharing options...
Green Baron Posted March 22, 2019 Share Posted March 22, 2019 (edited) On 3/22/2019 at 4:45 PM, YNM said: Does anyone knows better about this : Not more than what is in the paper. Apparently an eruption that spread under the "lid" of a thick package of sediments. Remarkable is the reference to the 2012 eruption off La Restinga here on El Hierro island, which was a real eruption, took place in an area well watched over and is documented quite well. There were visible sea surface phenomena (harbour entrance was actually closed several months) and measurable changes on the sea floor, like rising mounds on a ridge that now reaches to shallow depth. The causes are grossly known (Canary hot spot), though not as well as for instance Hawai'i. The Comores basin is only sparsely probed and watched over by instruments, but it is known to be tectonically active (part of the complex East African rift system radiate to there maybe ?). With better mapping of the sea floor and eventually faults and cracks, relative movement of smaller crustal units and better seismic data of the crust and upper mantle one could maybe tell more about it and its origin. Volcanism is pretty young there, so it is probably not a fossil subduction zone or other remains of an active boundary :-). Sea floor must be pretty old (like Jurassic), if it is still 4km deep despite of a layer of sediments on the oceanic crust. ------------ Edit: found a paper supporting the East African rift system extension (let us dub it EArse :-)) hypothesis as well as the tectonic activity of the Comores basin. Old ocean floor age is mentioned as well. So, as a first unqualified guess, the umbrella term "hot spot activity" may not totally be wrong ... https://www.sciencedirect.com/science/article/pii/S0012821X18305181 Edited March 23, 2019 by Green Baron Quote Link to comment Share on other sites More sharing options...
Mad Rocket Scientist Posted March 24, 2019 Share Posted March 24, 2019 (edited) For the function f(x) = 0 What is f(1/0)? The input is undefined, but x is never evaluated in the function. EDIT: I'm fairly confident that g(1/0) is undefined for g(x) = 0x, but is this different? Edited March 24, 2019 by Mad Rocket Scientist Quote Link to comment Share on other sites More sharing options...
Green Baron Posted March 24, 2019 Share Posted March 24, 2019 (edited) Well, if f(x) is constant 0 for all xes than it would be 0. But 1/0 is not defined anyway because division by 0. Or have i missed something ? For my laymen's understanding a proper function definition would be f(x) = dosomethingwithx, or not ? 0*x is still constant 0 for all xes ... Edit: if you're talking computer than yes, if no optimization and other checking is activated, the expression 1/0 would be evaluated at runtime (for C/C++), resulting in a runtime exception. I was astounded that the compiler (GCC 8.3) didn't catch that by default ... Edited March 24, 2019 by Green Baron Quote Link to comment Share on other sites More sharing options...
Nivee~ Posted March 25, 2019 Share Posted March 25, 2019 Say, if I want to convert a value in btu/(hr*ft2*oF) to kJ/(s*m2*K), how do I do it? I mean I get it for all other quantities, but I am a lil unsure about oF..... Quote Link to comment Share on other sites More sharing options...
kerbiloid Posted March 25, 2019 Share Posted March 25, 2019 As far as I can get the steampunk units, 1K = 1°C = 1/100 (water boiling-water melting) 1°F = 1/180 (water boiling-water melting) So, I would guess that you have to consider 1°F as (5/9) K. Quote Link to comment Share on other sites More sharing options...
Nivee~ Posted March 25, 2019 Share Posted March 25, 2019 (edited) 6 hours ago, kerbiloid said: So, I would guess that you have to consider 1°F as (5/9) K. Thanks, i will try it... but why in the name of Kraken do imperial units even exist???? Measurement is the most basic branches of mathematics, something every human does, almost every day, and we still don't have a common standard for this? Oh and please nobody tell me that 'There are 2 types of countries: those who follow metric units, and those who went to the Moon' garbage.. Edited March 25, 2019 by Nivee~ Quote Link to comment Share on other sites More sharing options...
Green Baron Posted March 25, 2019 Share Posted March 25, 2019 (edited) Yes, this is extremely annoying and the cause of many expensive (and sometimes hilarious) mistakes, even in spaceflight it happens that screws don't fit where they should. We do have the French originated SI (systéme international), with basic and derived units that is used in almost all relevant publications and is constantly under improvement and ever more detailed definition. If some boneheads :-) refuse to use it, one can either ignore them or apply the necessary conversions, There is no other way. ;-) Edited March 25, 2019 by Green Baron Quote Link to comment Share on other sites More sharing options...
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