Engineering

Hello, I have an interesting problem I need help with. I am trying to develop an optimization for a process that requires eigenvalue calculations on several (sometimes thousands) of matrices. These matrices have some special properties. 1. The matrices are Hamiltonian. 2. The matrices are symmetric about the main diagonal. 3. The matrices are mostly sparse. 4. All off-diagonal elements are either 0 or 0.05. 5. The 0.05 elements come in bands. 6. Between iterations, all off-diagonal elements stay the same. That is, only the diagonal changes between iterations. What I am wondering is, if I find the eigenvalues of the first matrix, can I use …

Hello all, I humbly ask for some assistance from someone who's more capable when it comes to science, I'm a work with my hands type of chap and the science behind things takes a bit of grasping for me to understand sometimes. So here is what I'm trying to do and where I would very much appreciate some help: I am building a steam boiler: It will be made of stainless steel and contain two heated tubes to boil water. These are the dimensions: W 25cm H 25cm D 10cm So a cuboid with two pipes running the 25cm length. The heated pipes are 800F or 427C, without the water/steam touching them. It will have a display to show the internal pressure, a b…

My next battery operated german toy, may need to wait a little for it, but been waiting way too long for a real flying saucer on the market. I will settle. Happy drooling ! -----> http://www.e-volo.com/Home.html

I learnt that the Bluetooth Low Energy will be utilizing the Star-Bus Topology. I tried to google the facts, merits and demerits of Star-Bus over Mesh Topology. But in vain. Would appreciate if someone can provide appropriate facts I have one more doubt on Star- Topology. Here, all the nodes are connected to the central hub. Is it possible for one node to make contact with another node through central hub? Regards

Please take my survey on genetic engineering. i am writing a research paper and requires this survey Greatly appreciated. Thank you

I am in my first years on high school (no points on guessing witch year) and I am very interested in robotics, but I don't really now that much about physics and technology ect. If there is anything you can tell me on the basics of it or anything else on robotics please tell me!

I am currently studying engineering at a college level and am thinking of moving into renewable energy at a degree level in the future. I am here because I have read a lot on this forum and realised many people on this forum have very good knowledge about renewable energy, I just wanted to see your opinions on what you think he future is like for renewable energy (concentrating more on wind power) and am I making the right decision going into this sort of engineering? I am planning on doing a foundation degree in renewables and then moving it on to a honours in mechanical engineering, after this I plan on taking it further to a masters degree level and am confused if I …

I was wondering if there is a power meter with detector that can accurately measure under 1 picowatt in the visible range 200 to 1100nm?

I have two questions: (1) One way to go about water purification is through reverse osmosis. Some sort of pump is used to apply a pressure on the reverse osmosis membrane. Is it possible to use osmotic pressure to act like the pump? An example is a system that has distilled water and the solution that needs to be purified in a tube separated by a semi-permeable membrane that only lets water pass through. There is a second membrane that closes off the solution (The solution is contained between the two membranes). There is an empty tube on the other side of this membrane. Will the distilled water create enough pressure build up in the space contained between the two m…

Greetings science girls and guys. I just had a question about solving the problems with my newly constructed faraday cage, trying to be a frugal as possible to still afford to feed my children. I will start by outlining the problem, followed by the intended solution, and the 'Fail Day' results: I have been working on constructing a harmonic scalar wave generator in hopes of being able to manipulate my brain wave patterns and force theta or beta wave patterns at will. The device is constructed and it seems to have some effect but the chaotic energy field that it emits is clashing with the low frequency scalar waves that ride the microwave transmissions from the cel…

I am presenting here my vision for a large pumped storage hydroelectric 2-square kilometres surface-area reservoir and 300+ metre tall dam which I have designed for the Coire Glas site, Scotland. (View site using Google Earth where the convenient label is "Loch a' Choire Ghlais" - or, http://tinyurl.com/coireglas) I was inspired to conceive and to publish my vision by learning of the Scottish and Southern Energy (SSE) proposal to build a smaller hydroelectric pumped-storage scheme at Coire Glas which has been presented to the Scottish government for public consultation. I have not long been aware of the SSE plan for the Coire Glas scheme, not being a follower …

I have been trying to figure out how to capture input from a PC joystick, then encode the position of each axis and send out from the PC via USB (USB -> stereo adapter). The idea is to transmit the joystick position via PPM which will then be used to control servos. I cannot for the life of me find this anywhere. I dont want to buy the finished products, I want to do this on my own, software included. Any guidance would be much appreciated.

I'm looking for methods of mechanical trimming for an idea I have for an object in water. (I'm not saying more cause I still want you to take me at least slightly serious.) All my searches turned up awfully empty so I am asking here.

I definitely want wings like this:

EDIT: This problem is now solved after LOADS of searching but I have a new question below. Also, just wanted to say sorry for all the questions I have been asking lately, I have been trying my best not to annoy you all by doing silly things like bumping my thread to say something not very important but you all have just helped me so much I just keep coming back for more Thanks. Question: Now I know about the ductile deformation is because of the dislocation of the chrystalographic planes slipping but what is brittlenes about, is this the opposite? Are the crystal planes harder to dislocate?

Dont want to bump this thread and annoy other users, so if your are reading this, thanks.

Thanks for the help.

Hi, I am trying to create a stabilisation device using a motion sensor to detect the position and motors to correct it. I have so far been looking at inertial measurement units and stepper control phidgets. I was wondering if anyone had any advice at all on which components I would need for this and how I could go about connecting it. Thank you for any help!

Given the same dimensions and both being made from the same timber; which is stiffer? The laminated samples' layers are not so thin that the glue contributes to overall stiffness by soaking it up throughout the layers. Differing grain direction is allowed if it makes a difference. This is with respect to guitar necks and their relative ability to resist bending under tension by the strings.

I just finished reading a really good book called 'Beneath the Dark Ice' by Greig Beck, which incidentally I highly recommend, as it's amazing. At any rate, one idea that was in the book that I found quite interesting was a type of advanced military rifle that literally fires super-compressed 'balls' of air that have the same effect as bullets within 200 feet of the shooter. I'm not talking about air-filled pellets, or air-propelled projectiles, I'm talking about a gun that literally fires compressed balls made of nothing but air that can kill in the same way a bullet kills. Now, there's no doubt in my mind that even if such a weapon is theoretically possible it would…

A while back I made some references to a very large potato gun I was working on. At the time I believed I was OK to talk a little bit about it but it turned out my Is weren't dotted and my Ts weren't crossed. That is fixed now. And thus, I return to present to ya'll my favorite creation. VERA. It's a gun designed to study transonic impact but what makes it fun is that it really isn't anything more than a very carefully crafted potato gun... If your potatoes come from Chernobyl Farms, that is. Enjoy.

Stumbled on this quite by accident. Many of you are probably familiar with either the process or the scam, just not me? Which is it? What gives? Is it really for real? 3-D printed tool? http://www.wimp.com/functionaltools/

I am reaearching on materials and had a few questions about ceramics, I read that the amount of water in the clay is important when using proceses like slip casting, spraying and pressing, I was wondering is there anything else that would be effected apart from the clay shrinking due to the amount of water in the clay mixture?

So I have been reading up on composite materials and have been geting a bit confused, from what I have read, composite materials consist of a matrix and reinforcement, the reinforcement can be fibers, I read that the way the fibres are placed will effect the machanical properties of the material does anyone know how this will be effected?

Could someone please explain to me the differences between nanomaterials and metamaterials? Are nanomaterials a type of metamaterial? Are the two terms interchangeable? Completely different?