Search for analysis in Topics

how can we test metal thread with the help of light

Hello everyone pls if some one can help and guide i want to build a device which can scan the threads metal bolt automatically after threading the metal in machine weather the thread is right or wrong i think it is possible with the help of light please if some one can help and guide Thanks in advance

Question by Singh    |  last reply

Circuit analysis: I just wanna know, how can I get (Vx) in the attached circuit below?

Please pay attention for the current and voltage direction

Question by Inventor Oreiby    |  last reply

Can someone suggest audio analysis software for a project I am doing? Answered

I am working on a project on holophonic/binaural/sound localization where I need to find the pitch, sound intensity, and other sound differences between the left microphone and the right microphone and I don't know much about audio analysis software. What software should I use?

Question by ANDY!    |  last reply

What software can i use to draw graphic analysis frequency response of opamp circuit? Answered

 I'm finding a program can draw the graphic analysis frequency response of opamp circuit from schematic (some thing like the image below) . What program can i use to do it ?Can you tell me please ! Thanks for advice! sorry for my bad English!

Question by login721    |  last reply

Why can a function satisfying same boundary conditions as functions Un(x) of a complete set be expanded as ΣCnUn(x)?

This is a question I encountered while reading Introduction to Quantum Theory by Hendrik F. Hameka (Please don't worry, I'm not trying to cheat on my homework, I am just asking out of curiosity). The book states the following:      "It can be shown that a function f(x) that satisfies the same boundary conditions as the functions Un(x) of a complete set can be expanded as f(x) = Σ CnUn(x) ... If we multiply by U*m(x) and integrate, we obtain < Um | f > = Cm " This second part is fairly straightforward because ∫ U*m f(x) dx = ∫ U*m Σ CnUn(x) dx and it follows that < Um | f > = Cn Σ < Um | Un > = Cn Σ δn,m = Cn However, the first part confuses me because I can only justify it when Un(x) = (2π)^(-1/2) e^(inx) (The example of a complete set given in the book, actually) In that case, it can easily be seen that the expression Σ < Un | f > Un(x) is just the Fourier Series expansion of f(x) and thus the result is valid for the particular complete set. However this does not explain why this is valid for all complete sets: "how can you prove that this conclusion is valid not only for this particular complete set, but for all complete sets?" is my question. Thank you in advance for answering! Please feel free to post any questions of your own if you need clarification. Also, please be advised that you should not post responses on the order of "you didn't specify an interval of integration, so your question is impossible!" - if you know enough to answer the question, then you will understand why said interval is not specified, etc. Once again, thanks!

Question by Xellers    |  last reply

A kind request: Google Science fair vote

I recently entered my Science Fair project in the Google Science Fair, an international science competition in which entrants can build, research, discover etc. anything they want to. For my entry, I researched on how prosthetic limbs can be controlled by thought alone and found that much of the mathematical analysis of the brainwave data had to be improved upon in order to make such a technology usable. Here is a brief synopsis, in case you were interested: ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- My project is, at its most general level, based upon the idea of the brain-computer interface.In this sense of the definition, anything we use to interact with machines is a brain-computer interface, including our fingers. However, amputees often face difficulties after the loss of such a vital method of interaction. Through research, I found that a current medical device, the Electroencephalograph (EEG) could be implemented as a direct brain-machine interface; in other inputs on a computer (such as a cursor) could potentially be operated by thought alone. However, I also learned that, although EEG technology has been in existence since circa 1920, it still suffers from the age-old problems of signal filtration and desired feature extraction. This means that current signal processing algorithms are not able to interpret the electrical signals exhibited by neuronal synapses very efficiently, thus making such an interface wholly impractical and inaccurate. My project sought to rectify this through the creation of custom signal processing scenarios that utilized new algorithms; specifically, the use of Linear Discriminant Analysis and Vector quantization compression/extraction methods for enhanced noise filtration and the removal of known artifacts (sources of electricity other than the brain, such as muscles). However, I decided it was not enough to run software simulations; to determine its true real-world applicability, I used a 14- channel EEG neuroheadset to gather electrical data from my own brain. I then built a prototype robotic arm with an onboard processor that would translate signals from the computer. Finally, I used the programs I created to "decipher" the incoming brainwave signals, and send corresponding messages to the robotic limb. I concluded that, by using my programs to perform the signal processing, I was able to increase the accuracy of detected brainwave patterns by about 16%. Although this may not seem like much, the brain processes hundreds of thousands of ideas simultaneously, and recognizing patterns requires a great deal of processing effort on the part of the computer. Finally, I reached an accuracy of about 91.35% using the programs I created. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Further in-depth details can be seen here: Recently, after submitting my project, I was notified that I was one of the 60 semifinalists world-wide; as part of the judging process, there is also an award called the "People's Choice Award." Essentially, the public goes online and votes once in each of the 3 age groups (13-14, 15-16, 17-18) for the project they believe is the best. I am kindly asking if you would consider voting for my project for this award; I believe this project holds many potential applications in the real world other than prosthetics alone; such technology could be effectively utilized by patients with paraplegia, paralysis, or even polio. The voting process is simple: 1. Go the Google Science Fair Voting website: (for my project) 2. Click the "vote" button in the upper right-hand corner Again, thank you for your time and consideration of my project, Anand S

Topic by tech industries  

Air sample analysis for the concentration of CO2/Carbon Dioxide? Answered

I'm working on a high school science fair project which concentrates on the CO2 emmissions of automobiles and anlyzes two methods of filtering CO2 from car exhaust. It's really a pretty simple project - except that i don't have a Carbon Dioxide monitor. Online they range from $200-800 and i've contacted the enviornmental department at a local university to see if they can help me. I'm still waiting on a reply but i'm wondering if any of you guys (or gals) have any ideas on how i can find the concentration of CO2 in car exhaust.

Question by Aaron Cole    |  last reply

Solar power comment analysis requested, very interesting.

I recently received a comment from a very new member on a very old forum post. It is in relation to the old post here. Big claims, but I've never heard of a tems though it seems he is referencing it as an activation energy of crystallization or some such. Any takers?

Topic by bowakowa    |  last reply

How to design Waffle Slab in Robot Structural Analysis?

I have a project where I have to design a seven-story building. The design needs to be done twice: once as a waffle slab and a second design as a two-way slab with beams. This should be done using Robot Structural analysis. The design procedure was not covered in class and I only know the basics in RSA. I would appreciate it if someone can help me find how to design a waffle slab and two-way slab with beams using RSA. I searched but I couldn't find any tutorial video. Also, if someone can give me some links that explain the design procedure. Thank you for your help!

Question by HMN93    |  last reply

Secret traffic analysis hanging up I'bles Web pages?

I am apparently unable to upload images to my library, and I'bles Web pages also show an indefinite "loading" condition. This has been going on for several days now. It seems like there are some stupid "hidden embedded images" from traffic analysis firms that are hanging things up. I currently see "Waiting for" on one tab (this one!), "Transferring data from" on another tab (my image upload attempt), and the nefarious "Waiting for" on two others.

Topic by kelseymh    |  last reply

Observing &quot;weather&quot; (stratospheric temp.) with cosmic rays

An article in New Scientist reports on an analysis of cosmic ray muon data from the MINOS underground detector, which correlates with "sudden" (24-hour timescale) temperature changes in the stratosphere. The original article in Geophysical Research Letters gives you a good flavor for how this kind of analysis is actually done, and written up for publication. The figure below (Figure 3 of the article) shows the beautiful correlation between the temperature (5-day running average in blue) as measured by sounding balloons, and the muon rate in MINOS (also 5-day running average, red band with uncertainties). The alignment of the two curves is obviously not known a priori. The exact numerical calibration between muon counts (red, right scale) and temperature (blue, left scale) is a fitted output of the analysis, not an input.To me, it's just kind of neat that particle physics can relate so sharply to some "real world" large-scale properties.

Topic by kelseymh    |  last reply

Correlation (or the lack thereof) between SAT scores and undergraduate GPA

There's a preprint out on arXiv reporting an analysis of entering SAT scores vs. in-major GPA for four years of graduating students at the University of Oregon.  The authors report a fairly low correlation coeffecient (0.35 to 0.5), with a long left tail in SAT scores.  The latter strongly implies that university success is not well-predicted by the SATs. They also find a high correlation (0.75!) between SAT and GRE scores. It's a very nice analysis, and a reminder that standardized testing is an excellent way to measure how well someone can perform on standardized tests.

Topic by kelseymh    |  last reply

how do i make a 9th grade lesson plan on Shakespeare's Romeo and Juliet?

How do I make a 9th grade lesson plan on language analysis including blank verse, Shakespeare idiom, imagery and sonnet form basing it on Shakespeare's play Romeo and Juliet?

Question by busingye    |  last reply

Looking for programming/scripting options for iPod Touch that don't involve Apple Dev solutions.

I've been casting around for ways to program my iPod Touch 2G, such as by using Python or Processing. Not enthusiastic about jailbraking it at present. Wanting to interface an Arduino to it to do data logging, time-series analysis, graphing.

Question by Chris Kinata    |  last reply

A Psychoanalysis of Dr. Seuss

I got real bored in summer school, so I opened up MS Word and wrote this*. Unfortunately, when I cut&paste;, it makes funny characters, so you have to download the virus word doc instead.It should be noted that the inspiration for this work came from an analysis of Seuss' The Cat in the Hat, which I cannot find ATM...

Topic by Labot2001    |  last reply

Can anyone provide instructions on how to build a portable type EEG machine?

I am conducting research on neurofeedback.  I have the equipment to SEND the various Hz frq. via audio headphones.  I need an affordable EEG machine that can read for  lack of a better description, a persons standing Hz frq.,  preferable that can be interfaced with a computer for real time analysis.  Thank you Vic

Question by focalpoint2009    |  last reply

Wondering if it would be a violation of copyright to use the American Girl mailer to make an Instructable? Answered

I have an idea for an Instructable that would utilize the advertising mailers from the American Girl company.  I have read the definitions and the analysis, but thought I would ask here for more information.  This idea does not involve damaging the dolls or defacing the pictures.  It is a positive craft idea for young girls.  Thanks in advance for any advice.

Question by cdawisconsin    |  last reply

3D Viewer

Instructables Team - I don't know when it was changed but the "View in 3D" upgrade works very well. I especially like the section analysis and exploded views.Makers - if you are like me and enjoy showing your work in CAD, please consider dropping STP/STEP files into your instructable.

Topic by mtairymd    |  last reply

Analysing your test results for Aspergers Syndrome

A free for all, discussion on self analysis of your test picture (a pie graph) or Aspie-Rating-Picture (ARP) and final score Please try not to post pictures here, leave that for Can somebody volunteer their non-Aspie picture, for the purposes of this discussion. Mine is here temporarily.

Topic by Lateral Thinker    |  last reply

i'd like to make a rfid chess board that can record the position of the pieces in real time for game analysis,?

It's called a blitz board, when the clock is hit it records the position of the pieces. then the full game is converted by software to a game database.  i have programming experience and electronics experience but it's been a while. trying to figure out where to start.?

Question by fusion    |  last reply

Giant Citroen DS transformer

Perhaps you've seen the Citroen transformer commercials like this one: In the March 2007 issue of Wired, a real-life Citroen transformer, built by Amorphic Robot Works with help from Squid Labs (particularly Corwin and Geo), got a nice, one-page writeup. I've included the page here, and you can also check out some more pictures here. I remember Corwin and Geo sweating quite a few bullets as they painstakingly took the initial idea, put it into CAD, animated it, checked for collisions, and finally did a safety analysis all on a tight deadline.

Topic by ewilhelm    |  last reply

How to prevent transistor saturation?

I am trying to create my own audio amplifier. My problem was when i have large signal amplification the transistors becomes saturated, as a result the resulting signal is already clipped. This problem usually occurs when i use a transistor at CE configuration. Using CC configuration prevents this saturation problem but it also makes amplification very hard. When i use CC configuration one of the two transistors becomes "useless" because collector current becomes very low and based on further analysis it seems like only the last transistor is doing the job.

Question by codestroy7    |  last reply

4.4-million-year-old fossil could reshape human origins - Ardi

By Dan Vergano, USA TODAYThe nearly complete fossil of a 4.4-million-year-old human ancestor, a female dubbed "Ardi," is rewriting the story of human origins, paleontologists reported Thursday.The analysis of Ardipithecus ramidus (it means "root of the ground ape"), reported in the journal Science, changes the notion that humans and chimps, our closest genetic cousins, both trace their lineage to a creature that was more like today's chimp. Rather, the research suggests that their common ancestor was a walking forest forager...More at USA Today Site - Discoveries

Topic by Goodhart    |  last reply

How can I build an electricity monitoring and control system?

The service will be to install energy monitoring equipment in a premises which records kW hours electricity usage and also voltage fluctuations. This data will be collected every few seconds, but summarized every few minutes. The recorded data will be transmitted to local data hubs and then over the internet to analysis software providing outputs which are meaningful to management. Several monitoring devices will be deployed in a building so that data can be collected in individual circuits or individual electrical machines. Additionally there is a requirement to control devices remotely so that they may be switched or moderated remotely. Thus for example, a heater might have a thermostat setting adjusted or be switched on or off.

Question by jamestyas    |  last reply

Wondering what I can do with this hollow cathode tube...

I've got this hollow cathode tube from a spectra aa machine (used for metals analysis). It was supposedly still working - my old boss at the lab I worked at found it and considered tossing it out as they no longer had that AA machine (they had upgraded to an ICP/MS), but knows I collect interesting looking things. Am I right to assume that cathode tubes are quite dissimilar to the variety of tubes used in vintage amps and of no use in that regard? Does anyone know what sort of power I'd be looking for to even get this thing to light up? On the plug at the end of its cable, they posts are labeled A through F, then H, J, and K.

Topic by incredibleweirdo    |  last reply

Roomba SLAM

My proposal for the scholarship:I will give the Roomba Create the ability to perform SLAM (simultaneous localization and mapping) within a typical house setting.There are three parts to this project:1) By using several IR rangefinders mounted on servos, create a 2D map real-time of the surroundings. This will be done with zero modification to the Create chassis. Very easy.2) Upload the map by wireless link to a PC for analysis. Intermediate.3) And the hardest part, continuously update the map accounting for drift over time (SLAM). Difficult but very useful!And I will give myself one additional challenge - I cannot use more than $100 in parts! The average hobbyist cannot afford much more than this, so to keep my tutorial useful I will stay within this limit.

Topic by societyofrobots    |  last reply

Two &quot;hot topics&quot; from particle physics -- read the actual papers!

I've noticed that two recent particle physics "discoveries" (what I'd call analysis results) are beginning to get some media coverage, at least in the science press. Below, I provide links to the actual papers (the preprints in arXiv), and a bit of my own opinion. I encourage the curious to read, or at least skim, the papers --- there will probably be a lot you don't understand (these are technical research papers, after all!), so don't hesitate to ask questions.Dark matter "observation" by PAMELA satellite -- excess of high energy positrons in cosmic rays PAMELA data are high-statistics, and they've done an excellent job with their systematics anddetector calibration. Their low energy data are entirely consistent with previous results, which makes the excess and plateau seen above 10 GeV rather compelling. I don't think we know enough about conventional astrophysical sources of positrons to have any confidence ascribing this result to "new physics.""Ghost particles" in Fermilab p-antip collisions -- excess of high impact parameters muons particles (like muons) are identified in big detectors such as CDF (and BaBar) by picking up signals from their occasional interactions with low density material, and fitting a trajectory in space to those "hits." You can't put active detector material all the way down to where the beams collide, so an extrapolation from the detector region to the "interaction point" is required. There can be many complicated and non-obvious systematic uncertainties affecting those fits. The fact that only about 1/3 of CDF was willing to sign this paper suggests to me that the systematics in this analysis are not really under control yet, and any interpretation of the result should be taken with a grain of salt.

Topic by kelseymh    |  last reply

Top 50 Instructables Commenters of 2007 Ranked by Number of Comments

This is the fifth in a series of data-analysis posts. Check out the first here. I love statistics, analysis, and raw data and so thought I'd share some of the really cool stuff with you. Thanks to trebuchet03 for helping with this and actually crafting the queries. Here are the authors who have made the greatest number of comments on Instructables during 2007. Author - Number of comments made on Instructables1. Mykhailo - 1373 2. trebuchet03 - 1312 3. lemonie - 1188 4. !Andrew_Modder! - 1127 5. Kiteman - 1108 6. Loosewire; SOE Operative - 874 7. canida - 856 8. Weissensteinburg - 837 9. GorillazMiko - 752 10. LasVegas - 749 11. Mepain - 721 12. [ James (pseudo-geek)] - 709 13. cowscankill - 708 14. T3h_Muffinator - 694 15. Metal4God - 694 16. ewilhelm - 679 17. Vendigroth - 637 18. noahw - 559 19. Danny - 557 20. royalestel - 546 21. the_burrito_master - 481 22. Trainman 2000 - 469 23. Punkguyta - 460 24. CameronSS - 447 25. faust - 445 26. Tetranitrate - 436 27. zachninme - 421 28. John Smith - 414 29. PetervG - 403 30. knex_builder_freak - 402 31. Brennn10 - 398 32. fungus amungus - 392 33. Aeshir - 382 34. bofthem - 381 35. bedbugg2 - 375 36. gunmanx - 371 37. Easy Button - 365 38. knex hater hater - 361 39. Kipkay - 350 40. smidge146 - 346 41. HamO - 333 42. joejoerowley - 332 43. oodalumps - 331 44. nerfer192 - 330 45. EthanGibson - 325 46. Vertigo666 - 324 47. Darkshot - 317 48. TheCheese9921 - 315 49. killerjackalope - 312 50. bunduk - 312

Topic by ewilhelm    |  last reply

Top 50 Instructables Commenters of 2007 Ranked by Number of Forum Comments

This is the sixth in a series of data-analysis posts. Check out the first here. I love statistics, analysis, and raw data and so thought I'd share some of the really cool stuff with you. Thanks to trebuchet03 for helping with this and actually crafting the queries. Here are the authors who have made the greatest number of forum comments during 2007. Author - Number of forum comments1. Goodhart - 4168 2. Weissensteinburg - 2209 3. Kiteman - 2107 4. NachoMahma - 2086 5. zachninme - 1190 6. Loosewire; SOE Operative - 1187 7. LasVegas - 1070 8. lemonie - 1011 9. Mykhailo - 974 10. Brennn10 - 885 11. Punkguyta - 878 12. trebuchet03 - 823 13. whatsisface - 801 14. royalestel - 797 15. RocketScientist2015 - 766 16. Metal4God - 737 17. Easy Button - 702 18. westfw - 670 19. oogitsmelol - 646 20. Bran - 639 21. Danny - 632 22. fungus amungus - 581 23. Mepain - 543 24. CameronSS - 520 25. chooseausername - 513 26. jtobako - 495 27. guyfrom7up - 486 28. T3h_Muffinator - 485 29. John Smith - 457 30. Pat Sowers - 453 31. Spl1nt3rC3ll - 437 32. canida - 409 33. jessyratfink - 400 34. gmoon - 395 35. Aeshir - 380 36. nerfer192 - 352 37. TheCheese9921 - 338 38. Tool Using Animal - 337 39. ewilhelm - 329 40. VIRON - 327 41. Sunbanks - 325 42. gyromild - 324 43. ll.13 - 316 44. Baron A - 312 45. kruser495 - 307 46. acer73 - 283 47. EthanGibson - 276 48. the_burrito_master - 269 49. Patrick Pending - 264 50. smidge146 - 263

Topic by ewilhelm    |  last reply

Computer program learns physics

From Wired:"In just over a day, a powerful computer program accomplished a feat that took physicists centuries to complete: extrapolating the laws of motion from a pendulum's swings.Developed by Cornell researchers, the program deduced the natural laws without a shred of knowledge about physics or geometry. ...Condensing rules from raw data has long been considered the province of human intuition, not machine intelligence. It could foreshadow an age in which scientists and programs work as equals to decipher datasets too complex for human analysis."LinkThe software has a long way to come, but apparently it's showing a lot of promise.What do you guys think? If computers can do physics better than humans, does that make human physicists obsolete?

Topic by drinkmorecoffee    |  last reply

Sketch Furniture - 3D designed and printed

The four FRONT members have developed a method to materialise free hand sketches. They make it possible by using a unique method where two advanced techniques are combined. Pen strokes made in the air are recorded with Motion Capture and become 3D digital files; these are then materialised through Rapid Prototyping into real pieces of furniture.Trendwatching's analysis:Swedish design group FRONT has launched Sketch Furniture, which is a method to materialize freehand sketches. Pen strokes made in the air are recorded with Motion Capture, and the resulting 3-D patterns are output digitally to a laser sintering machine. Over several days, the machine produces the object by shaping and hardening 0.1-mm layers of liquid plastic. Sketch Furniture is on view and on sale (about USD 10,500 per piece) at the Barry Friedman Gallery in New York.

Topic by ewilhelm    |  last reply

Top 50 Instructables Authors of 2007 Ranked by Number of Instructables

This is the fourth in a series of data-analysis posts. Check out the first here. I love statistics, analysis, and raw data and so thought I'd share some of the really cool stuff with you. Thanks to trebuchet03 for helping with this and actually crafting the queries. Here are the Instructables authors who have the greatest number of Instructables in 2007. This list includes unpublished projects, so I bet some of these people have great things coming up!Instructable Author - Number of Instructables1. trebuchet03 - 722. TimAnderson - 473. Kiteman - 474. sam noyoun - 395. noahw - 366. Brennn10 - 357. canida - 358. loup226 - 339. ewilhelm - 3010. threadbanger - 2411. randofo - 2412. unclesam - 2213. stasterisk - 2214. neelandan - 2115. Kipkay - 2116. golics - 2117. TeacherOfTheWays - 2018. Weissensteinburg - 2019. logic bomb - 1920. Tool Using Animal - 1921. msolek - 1822. fungus amungus - 1823. PetervG - 1724. avinash - 1725. royalestel - 1726. indymogul - 1527. technick29 - 1428. jeffreyf - 1429. Aeshir - 1330. tycoyoken - 1331. bofthem - 1332. i make shooting things - 1233. babblin5 - 1234. 5Volt - 1235. sardines454 - 1236. funwithfire325 - 1237. Vendigroth - 1238. - 1139. oldschoolstructure - 1140. Popular Mechanics - 1141. Daniel662000 - 1142. zieak - 1043. neighborsproject - 1044. Mr. Rig It - 1045. dave spencer - 1046. robbtoberfest - 1047. rachel - 1048. T3h_Muffinator - 1049. lemonie - 1050. degroof - 10

Topic by ewilhelm    |  last reply

How make a waterbird (pumpabike)

I am an Engineering science student doing my fifth year at Technology University in Vietnam. Part of our studies involves a final year project, and I have selected one on building a water craft similar in principle to the waterbird. Part of this project will primarily involve modelling this craft, how it works, simulation operation, structure analysis. Ultimately we will build a full size craft and test the design. However, some problems in structure and operating priciples which i don't understand, such as: - Properties spring? - Why they choose NACA 63-412? - time of a cycle action (jump down--> jump up) and amplitude ( only consider rear wing)? - properties aluminium used? Please answer some question? Capacity of English is bad. So, I don't clearly describle my desires. I hope you will sympathize. Very thanks! I hope you will answer in short time!

Topic by quangtruc106    |  last reply

Terrestrial mass planet measured orbiting nearby red dwarf

From Science Magazine:A group of astronomers today announced the discovery of the least massive planet yet detected outside of our solar system. It is lightweight enough--between two and three times the mass of Earth--to almost certainly be rocky like Earth rather than a huge ball of gas. Although the planet orbits too close to its star to be habitable, a new analysis of one of its neighbors suggests a world with deep oceans.The observation of Gliese 581e, made with the usual radial-velocity residuals fit, is of a terrestrial-mass planet orbiting insanely close to a red dwarf star. Nevertheless, it marks a substantial improvement (a factor of three in mass) in the precision of the radial-velocity technique.Read the whole article (let me know if it's password protected) for details.Another news article (including a very nice diagram of the habitable zone as a function of the mass of Gliese 581) is available from Science News.

Topic by kelseymh    |  last reply

Top 50 Instructables Authors Ranked by Pageview Density

This is the seventh in a series of data-analysis posts. Check out the first here. I love statistics, analysis, and raw data and so thought I'd share some of the really cool stuff with you. Thanks to trebuchet03 for helping with this and actually crafting the queries. Here are the authors who have the greatest pageview density (total number of pageviews divided by number of Instructables).Author - Number of Instructables - Pageview density1. dorxincandeland - 1 - 399,6522. kingant - 1 - 244,7263. spankval - 1 - 240,4204. tm36usa - 1 - 182,0605. Andrew546 - 1 - 158,4366. sspence - 1 - 140,4407. russwmoore - 1 - 134,6388. icecream_n_cake43 - 2 - 120,8749. kenbob - 1 - 117,38510. Stuart.Mcfarlan - 1 - 113,83011. ianhampton - 1 - 106,83812. cjanson - 1 - 102,42713. theRIAA - 2 - 94,48014. odecom5 - 1 - 94,17015. TheNaib - 1 - 90,62616. orthonormal_basis_of_evil - 1 - 87,82517. velacreations - 1 - 85,86018. atomic16 - 1 - 82,44319. Q-Branch - 6 - 81,80020. juliofo - 2 - 78,75421. mandrake - 1 - 74,85022. delgaudm - 3 - 74,75923. beam - 1 - 73,97024. gfixler - 1 - 73,40525. punish3r - 1 - 73,26626. barnes - 1 - 73,00127. irwinner - 2 - 72,13928. friedpope - 1 - 70,87229. sheekgeek - 1 - 70,30930. slyfox117 - 1 - 69,77331. Mr. Thrak - 3 - 68,70632. cre8tor - 2 - 68,67333. graphak - 3 - 66,83134. VzjrZ - 1 - 66,59335. ladyada - 5 - 64,80536. for290 - 3 - 63,43437. dasarp - 2 - 63,19738. Tom McWire - 2 - 63,03439. danfolkes - 2 - 61,10040. fiezi - 1 - 60,89941. tracy_the_astonishing - 3 - 59,42842. mikejedw - 1 - 58,69343. MrMunki - 4 - 57,53444. joedog86 - 3 - 57,47745. x86Daddy - 1 - 54,41646. Panda Face - 1 - 54,24847. Kipkay - 21 - 54,09248. oschene - 2 - 53,95549. darkmotion - 2 - 53,00250. KILLERK - 1 - 52,981

Topic by ewilhelm    |  last reply

Student project "AWR² (Autonomous Weed Removal Rover)" : we need your opinion !

"Hi, makers! As part of student project "AWR²" (Autonomous Weed Removal Rover), we would like to design a "robot vegetable garden" capable of maintaining an urban garden; this project will then be made available in open source. This robot will be able to move autonomously in the vegetable garden, to map its territory (finding the best path through vegetation and uneven terrain) and to detect weeds (thanks to its camera allowing image analysis by neural network and for the purpose of a weed control option). We would therefore need your opinion! If you ever own a vegetable garden, do you think such a robot would be useful/relevant in your garden? If you don't have a vegetable garden, would this project encourage you to have one? And finally, since this project will be available in open source, would you be willing to put 2000 euros (component price) to build this robot yourself?Thank you in advance for your answers!Signed all the team of AWR²“

Topic by ld160183  

Help with designing and testing a Pool Monitoring system

Hi, I don't know if this is the right place to ask this so apologies to all in advance if it is not. I have had a pool for some time and I got quite sick of monitoring it. I searched for any "off the shelf" equipment to help me with this but there are none available. I just wanted to make pool monitoring easy, or at least easier than it is right now. I have made a prototype which continuously monitors pool & SPA water including Chlorine, alkalinity, temperature, and can deliver that to my website in a graphical format. It gives me a history of the pool environment and helps me keep the pool in top condition so when the kids or friends and relatives drop by I know instantly what the pool condition is and if it is safe for everyone to go in. It has wireless capability and I have manage to get the battery life to around 20 days without a recharge and the new solar version (still being built) will go almost indefinably. Just wondering if anyone else thinks this is a good idea.

Question by research1    |  last reply

Instructables Newsletter wrongly rated as SPAM caused by SORBS listing

The newsletter sender is listed on the SORBS anti SPAM list and therefore gets rated as spam. An excerpt from the mail header: The Newsletter sender is listed on the SORBS List: X-HE-Spam-Level: +++++ X-HE-Spam-Score: 5.6 X-HE-Spam-Report: Content analysis details:   (5.6 points)   pts rule name              description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at, no                              trust                              [ listed in]   2.5 RCVD_IN_SORBS_HTTP     RBL: SORBS: sender is open HTTP proxy server                              [ listed in]   0.8 HTML_IMAGE_RATIO_02    BODY: HTML has a low ratio of text to image area   0.1 HTML_MESSAGE           BODY: HTML included in message   1.5 GENERIC_IXHASH         BODY: iXhash found in   0.7 MIME_HTML_ONLY         BODY: Message only has text/html MIME parts -0.1 DKIM_VALID             Message has at least one valid DKIM or DK signature   0.1 DKIM_SIGNED            Message has a DKIM or DK signature, not necessarily valid X-SPAM-FLAG: Yes X-HE-SPF: PASSED

Topic by teggen    |  last reply

Article in the NewAScientist: Science in the media: Put up or shut up

Science in the media: Put up or shut up25 April 2009 by Kathy SykesMagazine issue 2705. Subscribe....For similar stories, visit the Comment and Analysis Topic GuideMOST scientists want to see more science and technology in the media, but we're making life hard for ourselves by forever criticizing each other's efforts or denouncing journalists and film-makers for not portraying science in ways we approve of. While healthy debate can improve science communication, I think we could all shut up a bit, and stop the more rabid criticism altogether. I include myself here....If you're still troubled by how others communicate, why not spend less time ranting and get out there and communicate in ways you do like? Blogging is easier than ever, for example. Or if you prefer a more hands-on approach, in the UK or Europe you could enter NESTA FameLab's "Talking Science" competition ( Alternatively, your nearest science centre, science festival or local media will welcome offers of help.ARTICLE Link: The NewScientist

Topic by Goodhart    |  last reply

Government Trojans !!!

What do you all think of this practice ? Coming soon to a pc near you....government trojans.A government Trojan is spyware installed on a computer or network by a law enforcement agency for the purpose of capturing information relevant to a criminal investigation. Depending on the program, government Trojan horses may intercept email or VoIP traffic, scan hard drives for relevant digital media or even record conversations and videoconferences. As this type of software captures data and then sends it back to a central server for processing and analysis without a user's knowledge, it is generally classified as a back door Trojan horse virus. Governments have approached implementing Trojan horses in different ways. Swiss government agencies have been reported to be working with Internet service providers (ISPs) to record speech on an infected PC's microphone, as opposed to of intercepting encrypted voice packets. German agencies have sought authority to plant Trojan horses on the hard drives of suspected criminals using email that would install keyloggers, record webcams and microphones and scan infected hard drives for for documents, diagrams and photography. These email messages would be tailored to each unique target, similar to the method used in spear phishing attacks.More about Government Trojans.

Topic by Goodhart    |  last reply

Anyone know of a cheap Digital Video-Camera that has (or can be hacked to support) External / Asynchronous triggering?

Basically, I'm wanting to record something from several vantage-points (tennis-strokes mostly, but it would be relevant for things such as baseball or golf swings as well) using two or more cameras. The problem of recording with multiple-cameras is, if they're not triggered simultaneously, they could be capturing their respective frames at as much as 1/(fps*2) of a second (i.e.;16.7 ms for 30 fps) off from one another; which for many, if not most things wouldn't be a concern. However, since they wouldn't capturing the event at the exact-same moment, the usability of the video information for motion-analysis purposes is greatly reduced. For everything else other than lacking support of external/async. triggering, something like my relatively-cheap $120 ApiTek 60-FPS 1080p Camera (Std-Def would suffice) I picked-up on a whim at Walgreen's would fit the bill quite nicely. While professional cameras do have this feature (also referred to as a Master/Slave Camera Array), this is simply for my personal-use, and I'd have a hard time selling my wife on the idea that I need to spend multiple thousands of dollars on it.

Question by tennisaddict    |  last reply

And now I'm left feeling slightly empty

Finals are OVER! And I should be ecstatic, but I'm just exhausted. I had Fluids, knocked that mutha outta the park. Modeling Methods (ugh!) think I did good, even a zero on the final would still net me a B in the class. Circuit analysis (yech), somewhere between a 60-90 in that class, the class was incomprehensible, the online test was broken and you can't learn with 220 people chatting over the prof. and lastly Machine Design- I'm worried about that one, I had a 90% going into the final, but I forgot to put J & I for a solid shaft on my formula sheet, oops, that cost me a shaft design problem, and when the heck did we cover welding? dammint. Next up Vibrations, Heat Transfer, Mech Properties of Materials and CadCam. BUT!!!! in between, well I have an interview tomorrow, I'm undecided on if that is a good thing, and then it's a week of floating around the Caribbean. Woot! And I'm now a member of Tau Beta Pi, which I'm pretty darned proud of. But FINALS ARE OVER!!!! No more spending until 1am in the library until we're all so tired we can't even read the problems. YEA!!!!!! nap time.

Topic by Tool Using Animal    |  last reply

Top 50 Forum Topics of 2007 Ranked by Number of Comments

This is the eighth in a series of data-analysis posts. Check out the first here. I love statistics, analysis, and raw data and so thought I'd share some of the really cool stuff with you. Thanks to trebuchet03 for helping with this and actually crafting the queries. Here are the most commented on forum topic of 2007.Forum topic - Number of forum comments1. Random fun - 5952. Knex Forum (Random thread) - 3563. Who Does Well Around Girls? - 2684. Answer life's burning questions - win the thanks of many (and an Instructables t-shirt) - 2545. TOP SECRET - 2476. Favorite Fictional/Non-Fiction Swordsman/ Warrior? - 2377. Enter: Inferno - 2228. Deep Thinkers - 2019. big and crossed out letters - 19910. SR-v1 - 18311. Would you vote for a president who happens to be an atheist? - 16912. Your Most Painful Moments. - 16113. iRobot Scholarship Judging - 15514. Semi or fully automatic knex gun. - 15515. Knex wars? - 15416. fun question - 15217. Knex Rocket Launcher: Updated - 14818. Knex Injuries - 14619. Star (stasterisk) arrested at Logan airport for bomb scare - 14020. Global warming is real. Argue with me, I dare you! - 13821. Cautionary Tales - How not to do it! - 13522. The K'nex M4 Carbine - 13423. Anaimals - 13124. Official Instructables Logos - 13125. HOOOOOORRRRAYYYYYYY! (I'M IN!) - 12626. Imbisoles! - 12527. BLACKROD's Current K'nexWorkshop - 12528. Where U At? - 12429. What's your veiw on the problem? - 12330. Down to One Modest Proposal for the Instructables Site - 12031. What is the worst game of all time?? - 11832. crossbow - 11833. how to commit suicide??? - 11334. Updated Weapon Board - 11235. Is There Something Wrong With My Tree? - 11136. does anyone here dance on this sight - 11037. Hunting - 10938. Not a fan of Hilary for President? Give me a hand! - 10739. Why is Halloween so big in the USA? - 10640. How much music do YOU have?? (Poll Question) - 10341. iRobot Scholarship idea : Pool Cleaner - 10142. Knex Gunner Of the Year Award - 10143. Your Art! - 10044. What technology did you expect would be available now that isn't? - 9945. Does anyone know of any Instructables to do while babysitting? - 9946. Poll Question: Do you think health and safety has gone crazy? - 9847. Rejoice! No more K' nex! - Greasemonkey Script - Now with Allsteps! - v1.0.0.0 - 9748. Crazy things you've done? - 9649. Laser Cutter Finalists- Master List - 9550. Rant numero # 2 - 95

Topic by ewilhelm    |  last reply

Online Pirates Sunk - crew still paddling

The four men behind the (in)famous file-sharing website Pirate Bay have been jailed for a year, and ordered to pay $4,500,000 damages to a selection of big media publishing companies.One of the four, Peter Sunde, refused to pay what he called a "bizarre" fine; ""We can't pay and we wouldn't pay. Even if I had the money I would rather burn everything I owned, and I wouldn't even give them the ashes."Despite the ruling, The Pirate Bay website is still up and running - it seems that, whilst the activities of the website have been declared illegal, the website itself is not, presumably because none of the shared files are hosted by TPB themselves.Speaking to the BBC, the chairman of industry body the International Federation of the Phonographic Industry (IFPI) John Kennedy said the verdict sent out a clear message."These guys weren't making a principled stand, they were out to line their own pockets. There was nothing meritorious about their behaviour, it was reprehensible."The Pirate Bay did immense harm and the damages awarded doesn't even get close to compensation, but we never claimed it did."There has been a perception that piracy is OK and that the music industry should just have to accept it. This verdict will change that," he said.BBC StoryBBC Business analysis of TPB's operationsIFPI press releasePirate Bay's press conference

Topic by Kiteman    |  last reply

Freaky Optical Illusion!

Here is a cool optical illusion I got in an email:'The Brain'This is quite amazing..If you see this lady turning in clockwise you are using your right brain. If you see it the other way, you are using left brain.Some people do see both ways, but most people see it only one way.See if you can make her go one way and then the other byshifting the brain's current.BOTH DIRECTIONS CAN BE SEENExperimentation has shown that the two different sides, or hemispheres,of the brain are responsible for different manners of thinking.The following table illustrates the differences between left-brain andright-brain thinking:Left Brain Right BrainLogical RandomSequential IntuitiveRational HolisticAnalytical SynthesizingObjective SubjectiveLooks at Looks atparts wholesMost individuals have a distinct preference for one of these styles of thinking. Some, however, are morewhole-brained and equally adept at both modes.In general, schools tend to favor left-brain modes ofthinking, while downplaying the right-brain activities.Left-brain scholastic subjects focus on logical thinking,analysis, and accuracy. Right-brained subjects, on theother hand, focus on aesthetics, feeling, and creativity.If you look away, she may switch from one direction to the other.I found that if I just look at her feet or relax and look at the floorwhere the reflection shows, she will switch direction!

Topic by Arbitror    |  last reply

Graphical User Interface Library for Physical Computing in Processing

Visit our blog: The subject of physical computing, especially in the field of robotics, is a fascinating area that has already begun its triumphant in universities, schools and hobby applications and is developing with impressive speed. It is highly interesting that Pyhsical Computing and Robotics, more than any other area, can merge many different areas (engineering, design, psychology, biology and many other areas). Our target groups are mainly users with robotic and physical computing affinity: engineering, programmers, mechatronics engineers, product designers, interaction designers, communication designers, robotics, interface designers, developers, electronic engineers and artists. There are people who want to monitor and control the input and output of their system without major effort in which they rely on an interface library. Robot experiment sets are increasingly being used in short-term projects in schools and universities to provide basic knowledge on physical computing. Our analysis of current sets shows us that existing features don’t cover all aspects of robotics. The aspect that has been neglected so far according to our research, is the controlling and monitoring of experimental physical computing projects through a graphical interface. Visit our blog:

Topic by faydemir  

Top 50 Instructables of 2007 Ranked by Number of Comments

This is the second in a series of data-analysis posts. Check out the first here. I love statistics, analysis, and raw data and so thought I'd share some of the really cool stuff with you. Thanks to trebuchet03 for helping with this and actually crafting the queries. Here are the Instructables published in 2007 with the greatest number of comments (I know the year isn't over yet, but we're close enough):1. Laser Flashlight Hack!! - 1,2292. Shutdown Your School! - 5003. morretti SR-4 knex recon kit - 4994. GORKEM'S KNEX SNIPER RIFLE - 3925. XW30K 8-1/2 cm shot Shifle - 3586. Easy to Build Desk Top 3 Axis CNC Milling Machine - 3497. Knex Sniper Rifle - 3398. K'nex pump action rifle code:OSNJCKMA2 - 3149. 25MM Pneumatic Sniper Rifle - 31210. mepain's sniper rifle - 30911. Invisible Book Shelf - 28612. Barbie Doll Electric Chair Science Fair Project! - 28213. knex rifle - 27914. Make an awesome Harry Potter wand from a sheet of paper and glue gun glue - 27015. Mouse Mouse! - 25616. The VORTEX - 23317. FREE Hidden Electricity! - 22518. Mykhailo's L96 - 22519. Gorkems K'nex Sniper Gun (The same gun as the origional, just easiyer to follow instructions) - 22120. Match Rocket - 21421. [ How to softmod your xbox...for FREE] - 21422. The Ice Bulb - 21323. Opening up a coke machine - 21024. How to Make a Three Axis CNC Machine (Cheaply and Easily) - 20725. How to perform your own Tongue Bifurcation - 20726. $5 Mini USB Fridge! - 20227. How to make a great Knex weapon Instructable - 20128. Laser Cutter Contest Update: Fewer Rules, More Time! - 19629. The K'nexecutioner 1.02 - 19430. How to get some revenge on the credit companies - 19431. Homemade Infrared Goggles! For Under $10 - 19332. Fake Virus!!! - 19233. semi automatic knex pistol - 19034. Creating a 3D effect with image editing software (GIMP or Photoshop) - 18935. Exploding Salt Explosives from Salt - 18936. Polyphasic Sleep - 18837. huge knex crossbow - 18538. Blu-Ray Laser Phaser! - 18239. How to Build a Robot - The BeetleBot - 18240. How to Clean Your Sinuses - 18141. Instructable: Keyboard System - 18042. How to roll a Joint ! (if you dont like it don't read it !!) - 17843. Red Impact - Perfect Duck's K'nex gun. - 17844. K'nex FN2000 - 17545. Knex Switchblade (Now Improved) - 17046. Ultimate Guide to Making a Cheap but Effective Aluminium Forge. - 16847. Be an Aeronautical Scientist: Make your Own Jet Engine for a few Pennies. - 16748. the desert buzzard knex gun - 16549. Danny's knex m4 carbine working modle - 16550. Using Paper, Resin, and Fiberglass to be the Master Chief! - 164

Topic by ewilhelm    |  last reply

Helpful HacKerZ .. Thanks!

Is anyone else out there over the whole, turn on the computer "Oh. More viruses, delete, delete, delete" thing? It's getting old... Really old...My computer is stuffed, there are so many pop-ups yours won't get through anyway, It is so slow now I can't go to your sites and if I have to hear the "gummi bear" song one more time, I'll smash the computer which = no pop-ups at all!!!You know what would REALLY SHOCK ME ??Turning on my PC and actually have it work for a change... Instead of HaCkIn' PC's and damaging them, why not use your powers for good 'ole surprise factor... remember those days?? before profitiering arose.Why not let's say...Hack-in > Fix everything > delete all my viruses and set up a impenetrable firewall for me...Now that would make me remember your attack, instead of just deleting your infection like every other one.....I had been thinking about that for a while....Until last week when I received a new virus...After some analysis, it was found to be a simple crash virus for Internet explorer...Much to my amazement this little file crashes IE, resulting in all my annoying pop-ups from IE (I use Opera) having their window closed as soon as they open.... LoL!!!This is great!! No more pop-ups!!Thank you Mr or MrS HaCkEr for fixing my computer... You rock!!Anyone else had a weird or offbeat experience from a hack attack..?

Topic by Lftndbt    |  last reply

Can I use the same resistors for current shunt AND transistor balancing?

In my pursuit for a LPSU design, to get more HFe gain, higher current capability, decrease Vce dropout, improve thermals, etc. I would use 2 (or more) pass transistors. This requires load balancing resistors, so I thought I'd get clever and use these balancing resistors to also measure current for my current limiting capability! See pictures and explanation below. IMPORTANT: The second schematic implys the use of 100R resistors, that is a mistake, they are supposed to be 0.1 ohm, or around that figure. Details: The first picture below is a simplified diagram of how I currently have current feedback implemented. I generate a fixed (user adjustable) voltage across a 500R resistor via a current sink and an error amp (currently LM358) drives output pass transistor(s). Because the op amp drives the output to ensure the inputs are the same, the output current can be precisely regulated. It maintains a precise voltage differential across the shunt by means of the pass transistor. I don't want to take the naive approach with multiple resistances in the path of the current flow from the unregulated supply to the output, for obvious reasons. I could instead just measure the Vdrop on one of these balancing resistors, but that assumes that the current through those resistors is identical, which is not the case. So instead, what if I expand a bit on the first schematic, leading to the last schematic? Would that work? I want to understand the mathematical analysis behind it to prove it does work. 

Question by -max-    |  last reply

Test yourself for Aspergers Syndrome

Aspergers Syndrome has only been recognized since about 1995, we call ourselves Aspies. Try this test make sure you follow the instructions the results will only survive for an hour, so download them ASAP, the picture (a pie graph) or Aspie-Rating-Picture (ARP) and final score, you can chose to show to people, but the questions and answers are very personal, keep those to yourself. I plan to put my ARP here, that is something us Aspies enjoy displaying, something to be proud of, I hope that other Aspie group members put theirs on. Your Aspie score: 181 of 200 Your neurotypical (non-autistic) score: 28 of 200 You are very likely an Aspie It is possible to cheat to get a high score on the ARP, so I am thinking that ARPs can be voted off by members if members find the ARP unbelievable when comparing the member's ARP with said member's profile and activities on Instructables. Aspies don't practice discrimination, so even if you don't have Aspergers Syndrome, consider yourself as a honorary Aspie and sign up anyway. Visit A free for all, discussion on self analysis of your test picture (a pie graph) or Aspie-Rating-Picture (ARP) and final score Another link for Aspies is I will dig out more shortly, I have list somewhere, but that one was not it I recall.

Topic by Lateral Thinker    |  last reply