Engineering

Hi, I have a Garmin Instinct watch. When I press one of the buttons I come to a place where I can choose to set alarm, timer, stop watch etc. It will remember what I did last and show that when I get to the that place again. For example, if I use the alarm, the alarm will be displayed first. How does the watch save this even when it's turned off? It can't stay in RAM if the watch is turned off right?

Hello, I was able to build a machine to reduce torque with high ratios up to 1:700 gear box. What applications in mechanical engineering I could use my new invention in? Thanks,

I received an email from a man who uses a unique message in his signature. It is in the form of a math equation. To the left of the equal sign is SW. I did some brief checking online and did not find an equation using SW. I don't want to publish the entire equation so that someone else solves the message before me. Any help would be appreciated. Possible clues: 1. he is a "petrophysical advisor" who works with an engineering firm 2. the equation is next to a picture of an oil derrick If you have an idea what the equation might be used for but need an extra hint, I will provide more information. Thank you.

Hi, I know how LCDs and OLEDs works. LCDs uses a backlight and liquid crystals to control how much light is passed through the color filters. In OLEDs all pixels lights up by them selfe. Now, I wonder a few things: 1. Why can't LCDs be completely dark? I know that the backlight is on all the time, but the polarizers can align so that no light can come through? 2. Why does OLEDs have better contrast? Is it because it can get completely dark? LCDs can still get brighter. 3. Why does OLEDs have better viewing angle than LCDs?

If I have a 15cm diameter by 3 metre high water tank with a non-return one way valve at the bottom attached to a water pump, what size and power of electric pump would I need to pump water to fill the tank? Thanks

Hi. Seems like traffic lights could greatly benefit from artificial intelligence technology AI to save brutal amounts of fuel and time. What uncommon sensors would be needed for implementing such ?

How they were able to create an illusion of a black/dark colors in this 3D laser whale image? Don't black/dark colors assume an areas of light absorption?

Do we have any chart to help us sizing the suction and discharge pipe diameter when flow mass and velocity range is known?

Greetings to all HF enthusiasts! This shall be a frequency multiplier, but beware I haven't tested it (and won't in a foreseeable future). It will multiply, but whether it improves over existing diagrams remains to be seen. This diagram is to harvest an odd harmonic; connect the collectors together at one end of the coil to harvest an even harmonic. A balanced mixer could be built similar to the multiplier, with the LO input between the input secondary's middle point and the ground; adding two PNP would make a doubly-balanced mixer. I doubt such a mixer has advantages over a diode bridge. ----- Unusually, the multiplier has bipolars in common base…

It's a theory that hard-wood blades are able to excise cortical plate in skull-bone . My inquiry is about the ultimate failure of 2mm thick wood blade at maximum human arm-speed of 40metre/sec ( assumed to be accelerating). As surgical chisels need an upper limit of 2mm to avoid random bone cracking and damage, then 2mm wood is given to obtain a smooth surface to the skull-trauma fracture. A .2cm slice of wood of .1kg at 40m⋅s2 strikes on 5cm of bone (1 cm 2) = 16MPa. . Wood density ~ 1ton cu.m. The wood is impacted perpendicular to 2mm 'sharp' edge. Parallel ultimate failure is 40-70MPa and by analogy the perpendicular fail is ~8 - 14MPa for hardwood…

For a long time now this question has bothered me. I have a classic car, and I want to know how the rate of flow of coolant affects cooling. Could I make a simplified model to show how engine temperature varies with coolant flow? Obviously zero flow would halt the cooling effect. But does engine temp continue to reduce with increase in flow or is there a point where it stabilises or even drops? As an electrical engineer I dont have the tools to make such a model.

If electricity likes to shoot out of pointed things or the sharp edges of things, then what shape or geometrical figure does it like to go into?

im curios about engine piston sizes and why it is done. i have 2 vehicles. 1 is a toyata landcruiser 4.2 diesel strait 6. its about 25 yrs old. i have recently bought a new isuzu truck with a 5.2 liter 4 cyl. something i wonder is why are the truck makers seeming to go for larger pistons than 20 years ago. so why do isuzu have a 4 cyl motor when a 5.2 liter could easily be a 6 cyl.

Hi. New to the forum. I need to run a little motor out of a printer. I found a line in a laptop charger is 16v, lowest one. Other line is 32v. Anyway, the 16 will run the little motor just fine. I need to control that speed. It's either on high or off. Potentiomeeter, or rheostat? Please explain the choice. Thank you. I'm trying to get some quick education on this.

If you are, I got some questions for you? I will start off by asking what kind of laws/principles/theorems do you deal with in real life circuit analysis? What kind of software do you use? Does the computer do most of the work?

Hello,my name is Puja Chrisdianto Manapa, i have interest in biosorption research. Could you guys explain to me about the method i can use to reduce the time require for adsorption?

Another contraption accepting opinions: A submarine glider towing a boat. Linked by a hose doing the pull. Solar panel+battery on the boat compresses air. Flow of compressed air towards a bellows/bladder in submarine bow makes it buoyant with rising bow or sink with dipping bow when venting. Glider fins on submarine and cyclic compressing/venting should propel the contraption forward. Would the 'dorsal fin' or the 'tail fin' , or where be a better point to attach the hose for the glider to tow the boat ? This is a variation from an older thread ----> https://www.scienceforums.net/topic/72310-pour-your-brains-here-on-how-to-build-this-contrap…

Hi all. Picture a glider model, ballasted to stay near horizontal and near neutral buoyant when placed in the sea. When placed in the warmer water surface, with daylight and little depth pressure, some mechanism makes the nose go down, slightly decreases buoyancy and advances while dives. When reaches a set depth pressure, darkness and cold water, those cause the mechanism to toggle back towards being slightly buoyant and tilt nose up. It will rise and advance. When surfaces, little depth pressure, daylight and warmer sea temperature cause the mechanism to toggle towards slightly decreased buoyancy and nose down. It will sink again and advance. Repeat…

im a tradie who has spent his life with all kinds of tools. we often take for granted the thought that goes into designing most of these tools. so i was drilling heaps of holes into stone last week. something ive done many times but not really thinking bout it. i tried a different drill bit and was surprised how different it was. so then i got thinking about the science behind drill bit design and how i can learn more about it. after all, knowledge means being able to better choose the right tool for the job. ive tried to find a youtube vid about this but cant. specifically id like to learn,for example, why/how the spirals are different shapes and angles,…

In magnetic induction, how do I affect materials in between two coils or two metals inducing electric current? Lets say, two coils and there is plastic in between them, I want to melt the plastic by using magnetic induction (obviously, I want to induce heat). What are the WAYS to achieve such thing?

Hi, I know that laser guided bombs works by projecting a laser to an object and the bomb will have a photosensor that tries to keep the reflected laser in the center of the sensor, right? What I wonder is how does it know how to move in order to keep the laser in the center of the photosensor? Is this the only thing it requires to hit the target? Trying to move little all the time to keep the reflected laser in the center of the photosensor?

Hi. Would it be much better that flight recorders (black box) spit out their data contents instantly at any and every anomaly via radio to nearby receivers and kept there for evaluation instead of searching, recovering, battling time in a hurry ? I suppose emergency channel receivers are on all times at airports. It is century 21 !

I was wondering as I was playing Apex Legends that are these energy weapons possible, more accurately is to shoot an energy ball/projectile. How could today's science achieve shooting maybe balls of electricity without it scattering in an instant as it leaves the barrel. In my head, im thinking that energy is contained in magnets, then those magnets push the highly compressed electricity out but then it will dissipate very rapidly. Is there a way to partially solidify energy/electricity? (note: im not talking about plasma balls)

Hi, I wonder how the laser coming out from a laser microphone gets affected by sound waves.

I want to discuss the possibility to build an elevator on the Moon surface... There are some data: Basically, the speed on the surface will have to follow this rule: (where u = 4.905E12 m²/s) The limitation, for the length of the cable is 4,500 km high...