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Everything posted by Sensei
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By "host file" do you mean host file mentioned by wikipedia? http://en.wikipedia.org/wiki/Hosts_%28file%29
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No. Host file is just private DNS lookup table. Port forwarding you set in Firewall advanced controls. For instance this guy is setting up port forwarding without using any router in Windows XP:
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Any Windows computer (not to mention Unix/Linux) can be router. WinXP is fine for this task. It will just have to be running all the time. You will need two Ethernet cards plugged. Currently almost every machine has 1 built-in Ethernet, so you just need to buy one PCI card ($10 or so). Connect modem to 1st Ethernet card, and 2nd Ethernet card to switch to spread net to other machines. I have been using it this way for 12+ years. Do you know where in Windows set port forwarding.. ?
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NoIP doesn't copy any single file.... Software installed to update, is using gethostbyname() function (to look up www.noip.com), which is calling DNS, like any other Internet application. Then logging in service, with login & password, IP is already in TCP/IP packet data. ps. Stop talking about things you have no idea about.. The whole point of dynamic IP updating DNS service is to have DNS record to point to right IP address (no matter if it's static or dynamic). The whole point of forwarding IP & port is to have service=daemon at private IP host. Thanks to forwarding it will be available from Internet.
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There are dynamic updating IP services like f.e. NoIP. I have been using it for several years when I had ISP that was giving me dynamic IP, not static IP. User has to install app that's connecting to service. And whenever ISP is changing our IP that software is sending information to service about change and new IP address. And DNS is updated to always point to our dynamic IP address. It costs almost nothing (as much computer-server will consume energy for 24h/7d running). It's completely unrelated subject from OP question.
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fiveworlds, what on Earth are you talking about? He is talking about TCP/IP port, not router physical LAN port. Port is parameter to f.e. BSD socket's connect() function passed through structure sockaddr_in.sin_port.. it's defined as u_short, so there is theoretical limit 65536 ports per machine (in practice much less). Somebody connects to server/router at IP x.y.z.v and port xxx, and server/router translates it to machine in intranet and perhaps different port. Each port= separate daemon-server (=computer application like f.e. FTP daemon, HTTP Apache daemon, Counter-Strike server etc.)
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Do you saw Discovery tv document series "Gold Rush"? In later one, in South America, native Indians were using Mercury to extract Gold, with bare hand playing with Hg-Au balls.. And burning them in fire.. http://www.miningfacts.org/environment/does-mining-use-mercury/ Probably I don't have to mention how stupid it is.. ?
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1) digital camera Full HD with tripod, spare memory cards, and AC->DC charger to perform experiments and record them on video. f.e. place voltmeter, ampere meter, watt-meter, thermometer etc. etc. on screen, and pass current, read current and energy from measuring devices, read temperature increase etc. etc. Thanks to recording everything, you don't need to read values during experiment - you will do it later, watching video, and entering them to SpreadSheet/Excel to make graph. I am using for this purpose Nikon S6600 http://www.nikon.com/news/2013/0806_cpx_01.htm (tripod & AC charger must have, to be able record long experiments) 2) device that has something to do with physics, like Cockcroft-Walton generator (so you will be able to make plasma, ionize gas and analyze spectral lines by yourself), Van Der Graaf generator (http://www.eduvis.pl/oferta/fizyka-pomoce-dydaktyczne/zestaw-nr-164-generator-van-de-graaffa-detail ) Wimshurst machine (http://www.eduvis.pl/oferta/fizyka-pomoce-dydaktyczne/zestaw-nr-50-maszyna-elektrostatyczna-wimshursta-detail ) just $150. Stirling engine (http://www.eduvis.pl/oferta/fizyka-pomoce-dydaktyczne/zestaw-nr-113-silnik-stirlinga-detail ) just $180 Lasers (three colors R,G,B) and setups for them (polarization filters, diffraction grating, young's double slit etc. etc.) 3) telescope for watching stars. 4) microscope for watching microorganisms. (better both with USB adapters so you will be able to record it by computer and send instantly). 5) chemical compounds model kit, if you're interested in chemistry ( http://www.eduvis.pl/oferta/chemia-pomoce-dydaktyczne/chemiczny-zestaw-nr-27-modele-kulkowe-detail) $140 but there are one for 20-30$ with smaller quantity of atoms.
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A hardware (big vs little endian) issue in software??
Sensei replied to mcompengr's topic in Computer Science
Show bigger code of what you're talking about.. Qt is Qt GUI? http://en.wikipedia.org/wiki/Qt_%28software%29 GLUT is OpenGL Utility Toolkit.. Pretty basic standard thing. http://en.wikipedia.org/wiki/OpenGL_Utility_Toolkit QT GUI has some controls where OpenGL commands can be executed. -
CD player, or alarm-clock, are doing their very limited program (which might not be program but just set of automatically executed tasks). While real AI computer program can/should learn. Observe and analyze world by sensors and react/adopt to them, remembering how world behaves.
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As we can read on f.e. http://www.biomerieux-usa.com/servlet/srt/bio/usa/dynPage?node=bioZone_FAQs it has to be purchased.
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More precisely it's not cone but something like this: Cone had 5.45% bigger area than flat circle area. Satellite dish will have even higher difference in area. Once we have area, we can calculate normal vectors of that curved surface and use it to calculate Sun's emitted/absorbed energy. Flat circle area would have normal vector pointing directly to Sun. But antenna has curved surface. Satellite dish is very picky about rotation. It's directional antenna. I have such for Hot Bird satellite. It must be very precisely adjusted (and I hate doing this!) 1mm difference in any axis, and there is no signal. It has 4.6 times smaller diameter than Pioneer. But Hot Bird is much closer to us. Make right triangle with a=40.4 and b=1. And calculate angle. Angle is -1.44 degrees at one moment, and +1.44 degrees half year later, when Earth is on opposite side of its orbit.
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Enthalpy, if you don't want to introduce misunderstanding you should always provide calculations in Latex, so everybody can follow it step by step. We're not reading in your mind. Antenna has no area 5.9 m2 because it's not flat surface (circle area with radius r=1.37m), but has depth 46 cm, so it's actually cone. Area of such cone, without base, is [math]A=\pi*r*\sqrt{r^2+h^2}=\pi*1.37*1.4451643505=6.2199612583 m^2[/math] Another thing is that antenna is not pointing at the Sun, but to the Earth, as it's sending and receiving data to/from us. Yet another thing is that anomaly just started at distance ~40 AU. And then is continuing to 67 AU and further. While light from the Sun is dramatically decreasing.
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A Planks formula, a moderators formula and a lay-man -- confused.
Sensei replied to Kramer's topic in Speculations
The more he will learn, the more he will see his model/theory is not matching Universe that we know. And I gave him values that would match 9 months ago in PM, ignored.. -
Photons and conservation momentum (split from Pioneer anomaly)
Sensei replied to Bjarne's topic in Speculations
I see no single speculation made by Bjarne, so I don't know why whole thread is in speculations sections.. He is just constantly asking for "hard evidence". Asking for proof is not speculation. Speculation would be if he came up with his own theory, his own model. When we're performing classic physics experiment with two solid state matter balls that transfer momentum to other one (like f.e. Newton's cradle, billiard), conservation of momentum is instantly visible. It's what we can call "hard evidence". With single particles it's much harder to perform convincing experiment, as particles are quantum objects. -
help with electron configuration concept in transition-metal ions?
Sensei replied to rainingspiders's topic in Homework Help
Cerium will have Xenon as base [Xe]. -
A Planks formula, a moderators formula and a lay-man -- confused.
Sensei replied to Kramer's topic in Speculations
Understanding of black body radiation doesn't require knowing everything (anything?) about quantum physics. But yes, I think, I do. You should start from reading this http://en.wikipedia.org/wiki/Black-body_radiation And then this http://en.wikipedia.org/wiki/Thermal_radiation I have right now turned on "black body radiation" device, namely light bulb. Sorry, I don't understand what do you mean.. I didn't mention any problem. Kramer, when somebody mentions something unknown to you, enter that phrase to google search tool and read articles about it. Simple enough? These equations are from 1900. Before any quantum physics. Simply take light bulb, turn it on, split light coming from it on prism, and measure each wavelength independently (in practice couple points, red, green, blue, and couple in between). And you will receive result similar to black body radiation graph. Anybody can do that at home. -
Photons and conservation momentum (split from Pioneer anomaly)
Sensei replied to Bjarne's topic in Speculations
That article is not correct. The first paragraph "It is well-known that a radioactive substance follows a fixed exponential decay, no matter what you do to it." Is not entirely true. For instance, if we have unstable isotope that is decaying through electron capture (or double electron capture), when we will ionize atom, stripping off all electrons from it, it won't be able to decay anymore.. When Beryllium-7 (that's decaying through electron capture exclusively) is part of larger chemical compound, decay rate also changes slightly. -
Photons and conservation momentum (split from Pioneer anomaly)
Sensei replied to Bjarne's topic in Speculations
What?! If you have no idea about radioactivity, here is thread to read by you... http://www.scienceforums.net/topic/86454-half-life-and-radioactivity-need-an-explanation/ Radioactivity we can see on our own eyes, see http://www.scienceforums.net/topic/86284-particle-detectors/ -
Satellites are typically sending data to us what amount of energy its solar panels received per second. So variations from inverse-square law should be easily spotted.
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Why someone would like to think about me as an enemy when I didn't do anything bad to him/her? I don't have (alive) enemies.. Do you find it "mistake"? It's whole message.. That's whole essence..
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Jews/Christians God doesn't "work" that way. He is the only one, for either believers and not believers and love them all regardless whether they believe in him, or not. After all everybody are their children. Somebody can be believer, and making evil deeds, and somebody else can be atheist and being saint from point of view of committed sins and behavior with other people.. Where he did so? Try to understand them. They were banished from their motherland for 1000 years..
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Photons and conservation momentum (split from Pioneer anomaly)
Sensei replied to Bjarne's topic in Speculations
And that's how science works. Show examples that don't work this way. -
Photons and conservation momentum (split from Pioneer anomaly)
Sensei replied to Bjarne's topic in Speculations
You're the first one I see, and I hope so the last one, to suggest to *NOT* read scientific article on science forum! Pathetic. While reading that article he could find a link to Nichols radiometer.. And learn about couple things at the same time. Things the he might not be aware of. Or are you claiming that momentum of incoming photons are not conserved in Crookes radiometer? In any experiment every conservation laws are obeyed from definition. Even the one you're not interested in. The question I was answering "That radiation really can convert to kinetic energy,?" Nichols radiometer reading is done by measuring heating effect. So your answer is even incorrect. What are you talking about?!