Engineering

Unmanned Expedition to the https://en.wikipedia.org/wiki/Wolf_1061c Let’s consider that mankind is able to build a version of: https://en.wikipedia.org/wiki/Fusion_rocket Namely: The NASA/MSFC Human Outer Planets Exploration (HOPE) group has investigated a manned MTF propulsion spacecraft capable of delivering a 163933-kilogram payload to Jupiter's moon Callisto using 106-165 metric tons of propellant (hydrogen plus either D-T or D-He3 fusion fuel) in 249–330 days.[5] This design would thus be considerably smaller and more fuel efficient due to its higher exhaust velocity (700 km/s). In 2006, the United States was estimated to have a production capacity of 11 mi…

An electret microphone has air between the capacitive foils. To operate it in a pressurized 4 atmosphere air chamber, would have to be vented to prevent imploding. Could perforating a tiny, tiny 0.1mm hole in the electret foil cause concernible degradation on its performance ? Or, side venting the housing voids ? Or, ... ? Figure 10 ----> http://www.openmusiclabs.com/learning/sensors/electret-microphones/

Wow, I didnt know of this forum love it Looking for a material with very high emissivity to work as a 1m2 black body, absorbing concentrated solar light transferring the heat to the material under, standing a temperature preferably around 1000-1200c for longer periods of time. It will be in vacuum too. Also I'm looking for material with very low emissivity material that can stand temperatures of at least 1200c preferably more, over long periods of time It will reflect concentrated solar light Both of them will be in 1pa vacuum and preferably somewhat abundant.

What is the typical operation limits of AC power meters ? Do they register -say 10 mA ? Water meters are unresponsive to a drip, drip, drip... Vanes do not turn at very low flow. Is there a typical minimum ? What does wear imply in them, -say ten years.

Hi Looking to get some understanding of machine sizing, but I cannot seem to find a source for the derivation of these output equations for the IM/SynM. Could anyone help with this derivation or point me in the direction of a source? CK

Is there any economical or scientific reason for manned missions to other celestial bodies? While manned mission will most likely be able to collect scientific data faster than unmanned drones these will be very limited in terms of duration of their stay and so devices like Mars rovers might be able to outperform a manned mission both in terms of amount of scientific data collected and at a fraction of the cost. Another option is a long-term manned research base, which, while being extremely expensive will not be as limited in terms of duration of stay and be able to collect scientific data faster than unmanned devices. Which one of these three is better in terms …

In this design, the engine is a combination of diesel and jet engine technology. A 36-cylinder diesel engine is the core part of the concept, operating like a pair of linked up 18-cylinder motors. The front engine is a bit wider than the rear one, but has a wider, hollow crankshaft rotating one way while the rear engine crankshaft rotates the other way and extends through the first one. Questions regarding the piston portion of the engine: - In this idea, the engine uses lightweight but strong high temperature alloys. I'm imagining it to be a mix of beryllium, titanium, and magnesium, maybe the cylinders could be made from high-temperature strength steel if need…

I my trying to build and oven need materials to use for interior and exterior

Hi! I'm new to this, but I was just wondering why the heck nobody has started manufacturing Nixie Tubes?? I think it would be a great business selling them for super cheap!!

Hello everyone, I am an Engineering student currently working on a project. The project is to design and fabricate CSP (concentrated solar power) based vapor absorption refrigeration system. I hope everyone here knows about vapor absorption system and its components. The problem that led me to post here is that, I am using concentrated solar power from a parabolic trough as a heat source for my generator. The generator is actually a pipe which contains the refrigerent and absorbent solution(LiBr-Water),the generator is directly exposed to the concentrated solar light. Now I am all set with other components of the system, the only problem is: "I have T1 as temp…

Let's say that I power a solar panel indoor (underground or under roof) with artificial light, and I place a concave mirror on top of both the solar panel and the light, how efficient would this be?

Is it possible to create 2D screenless displays? What technology would you propose?

With oil dropping to $30/barrel..and possibly dipping lower, is there pretty much no hope for alternative fuels? With gas being near $2.00 a gallon, I don't see any infrastructure being laid out for AF use/ research. I'm a big advocate for AF and this makes me sad. Thoughts? ~EE

In need to seal a sturdy PVC plastic bag with a flexible, permanent, agressive glue. Thermosealing / thermowelding would be the correct way, but not on hand to do it that way. The bag shows "Recycle 3" which should be PVC, made of about 0.3mm thick 'films' Unsure if something that somewhat dissolves the material to form the bond would be better. Any product recommendation ? ----> http://www.diomedia.com/imagePreview/01AFTGU4?imageId=9927668&imageCode=01AFTGU4&contributor=Phototake+RM&siteName=www.diomedia.com&title=&location=&ds=760&newStyle=1&tc=FFFFFF&tbc=333333&qv=95&icc=1&cl=1 No, it is not refilled …

Hello everyone A friend of mine is working on smart houses where devices are connected to each other wirelessly and connected to a computer then to internet ... now, many engineering projects are extending this study to make smart cities and then smart planet. The question is, with each technology comes some risks, .. do we really need smart cities? and how risky would it be to make all devices in a big city connected to the net ?!

One of the ways to increase energy density of a capacitor is to increase dielectric permittivity of the dielectric. Some sources claim that when some materials (for example some ferroelectrics) approach Curie point their dielectric permittivity start to approach infinity. What happens to dielectric strengths and energy density then? Metals demonstrate infinite dielectric permittivity. What if we take a metal plate completely embedded in dielectric (for example a ceramics) and place it between two capacitor plates? Another way to increase energy density is to increase capacitor plates surface area. What if we use cermet for electrodes in a dielectric capacitor? Cermet…

Hi I have a concept for a device to assist in a manufacturing process that would require a hand held electro-magnetic device. (Not fixed magnet) (I would prefer not to discuss the actual process for confidentiality reasons) The device needs to be hand held - not a robot arm. The device needs to be comfortable to hold and move about for short periods of time (I'm thinking weighing less than 1lb in total including power source) (Must be battery powered) I'm looking to develop as high a field strength as possible as the higher the better - also if it can be focussed to some degree that would help. Whilst I have electronics skills I have no practical experien…

I am making a generator. The power it produces is 12v dc which means I can't run anything that uses 110v AC I was wondering if I could use the step-down transformer in a cell phone charger that has an output of 12v dc and an input of 110vac and reverse the input and output to turn 12vdc into 110vac. Would this work if not have any other ideas that aren't to complex or costly.

I'm looking to setup a homemade CRT experiment, for two purposes the first is of course the standard tests for observation but the second and main reason why I'm looking to do this I will now explain: From what I have managed to assertain Magnets are able to affect the electrons passing in the tube, and what from that it is my understanding that the electrons should be capable of inducing an electric current within a copper coil that is wrapped around the head of the tube. I am here to ask for the opinion and knowledge of the community members in regards to this, and whether or not this is an accurate assumption to make. I have far too many projects, most of which I'…

I am a Science student in school, I have interest in Electronics. And I want to build some projects using Arduino and Raspberry pi, for my school exhibition. But I am confused, which board to use, like I want build a robot who, recognize the faces of persons and speaks their names. As far I searched, I am very confused between two boards, I am good at C++, so I should use Arduino, but people suggest me to use Raspberry, can anyone guide me which board to use, for which project. This robot is just a example, i have some more project ideas in my mind, so some general idea is needed for choosing between these two. Please help me out to find out. Thanks

We are solving for X, X is a device or combination of components which satisfies the requirements. Given: I have a limited source power (ie, 1W) I have unlimited resources to design electrical components and unlimited time. Requirement: device must output a 10J pulse. Allowances, For my math to work, the device can accept 1W for 10 seconds to be able to output the 10J during a 1 second cycle, assuming no losses, no resistance, etc. Does a Marx Generator do this? What X device satisfies this requirement?

Hello everybody! This shall be an analog-to-digital converter (Adc) for radiofrequencies. Up to now they're "Flash" converters or similar, whose dynamic range doesn't fulfil radiofrequency desires, because their complexity and the offset and 1/F noise limit them, especially if using the fastest components. My proposal instead uses several stages that are Ac-coupled to remove the offset and 1/F noise, where every stage contributes the digital output and has a modest gain. It is similar to a "logarithmic amplifier" (not the one with an op amp, but the amplifier-detector formerly used in radars and spectrum analyzers) like the LT5538 http://www.linear.com/docs/26333block d…

what is this space for ? it looks like an elevator well ? or what else ? and the pic is taken from the top ?

Seen some orientals propelling their small boats with a single oar 'yuloh' at the transom, on 'Z' motion. ----> http://www.simplicityboats.com/1Scullings.jpg Would there be an advantage of the oar paddle being flexible, as a fish/whale tailfin propulsion, not for 'Z' motion ?

Does anyone know where in the Unites States Digital writing pen company is? I live in North Carolina and haven't a clue where to look? I also would like to invent a new Digital writing pen with cover, but who can to trust these days? curious