Tag Info

Hot answers tagged computer-engineering

41

A refrigerator is basically a heat pump designed to achieve a temperature close to 0 °C. There are a couple of problems here: Most refrigerators are way too weak to effectively tackle the heat output of modern PCs. It will not magically make your PC 6 °C - instead the PC will de-cool all your groceries. Condensation. Computers and electronics do not like ...

18

To elaborate on ratchet freak's answer; CD-ROMs work by sensing the intensity of the light reflected from the CD as it is spinning. More light being reflected stands for a 1 and less light being reflected stands for a 0 (or vice versa). One way to encode the information would be to have highly reflective surfaces for the 1's and dark patches for the 0's. ...

17

We do. It's just an up-sized (i.e. more powerful) version of a refrigerator known as an air conditioning unit. Essentially all server rooms and most spaces where PCs are located (speaking for the U.S., at least) are air conditioned. Server rooms almost universally have dedicated HVAC systems and they will indeed be designed to keep the room at a more-or-less ...

12

refrigerator boxes tend to generate condensate There are specifications for acceptable relative humidity (RH) for servers. Air conditioning in server rooms will maintain RH within the allowed limits as well as maintaining temperature limits. You can't risk having condensation forming on electrical wiring or circuit boards as it will disrupt operation. ...

11

In General THUMB instructions aren't to my knowledge intrinsically slower than ARM instructions, but rather are more limited in capability. If your code only needs the functionality of THUMB instructions, it will occupy less space than ARM, but would be the same number of instructions and, other things being equal, run at the same speed. If your code needs ...

10

Because of optical interference. When the laser is fully in a pit or fully on land then it gets reflected cleanly and will be picked up by the sensor. However, on the transition, half the laser is in the pit and half is in the land and the reflections will interfere with each other and the sensor won't pick anything up. The pit depth and laser color (...

9

Here's a webpage from a random guy who put a light bulb in his refrigerator to see what would happen, and took careful data to monitor it. Results: The next experiment was to put a 60-watt incandescent light bulb inside the fridge. ... Over the next 55 minutes, I saw the temperature in the fridge slowly creep up, while the fridge's compressor ran ...

5

They've been doing that with computers for 30+ years. Back when computers were the size of refrigerators. They use to get a regular air conditioner. Build a platform for the computer to stand on. A hole in the center of the platform. Then duct the air conditioner to the bottom of the platform. Forced air rose through the computer. For your needs - can ...

4

The easiest way to vaporize a metal is to create a filament of the metal. Heat the filament in the vacuum to its sublimation (vaporization) temperature. Alternatively, when the metal cannot be shaped into a filament, the metal can be encased in or painted on a "wrapper" metal. Commercial evaporators for alkali metals are designed this way. The wrapper is a ...

4

The price-to-effect ratio for heat pumps is just not there for any large scale applications. Especially since air or watercooling is far less complex, and therefore a lot, lot cheaper. Dust is actually not a problem, just put the air intake through a room with filters (just like most mid- to high end PC cases have nowadays). For watercooled server centers, ...

3

The Von Mises Stress and the residual stress are not the same thing. To get the residual stress, do another time step where all the applied loads are zero. If there is material nonlinearity (plasticity or creep) the stresses and deflections will not return to zero when you remove all the loads.

3

If you notice, you need 20 bits to access the 1Mb byte modules. But your processor is word aligned. So 2 1Mb byte modules form a 2Mb word module. The key to understanding how it works is the Misalignment at the bottom. You need 20 bits to access the specific byte aligned memory, but each location is a word or two bytes. So you leave A0 (Address bit 0) ...

3

Yes, a computer uses varying amount of power. Yes a 3D printer uses a varying amount of power. In fact all electrical devices do vary based on load. Both motors and processors use more energy when there is more load. This is pretty easy to see in a computer or graphics card when you run something heavy, then eventually the fans kick on maximum to cool the ...

3

An important factor is that computing inherently has a numbers of layers of abstraction and function between the end user and the actual functionality. To some extent this is a from of automation in that regularly used actions are packaged into a single simple set of commands. There is also the fact that more computing power allows more visually orientated ...

3

The first paragraph from your second reference seems pretty clear. The first sentence states that Network interdiction is the monitoring or halting of an adversary’s activity on a network. Your confusion probably arrises from thinking of the word 'network' in too specific a way. To understand this more clearly, it is probably best to consider a ...

3

There are several components in a microprocessor that may all have their individual size: data bus, address bus, registers, and ALU (arithmetic logic unit). Modern CPUs also have caches, memory management units, floating point and single instruction multiple data (SIMD) units. (Also nowadays you have multiple CPU cores in one CPU.) All those units may have ...

3

The balance of linear momentum is $$\nabla \cdot \boldsymbol{\sigma} + \rho \mathbf{b} = \rho \mathbf{a}$$ where $\boldsymbol{\sigma}$ is the Cauchy stress, $\rho$ is the mass density, $\mathbf{b}$ is the body force, and $\mathbf{a}$ is the acceleration. Given a nonlinear stress-strain relation $$\boldsymbol{\sigma} = g(\boldsymbol{F})$$ where \$\...

3

4 - 40 UNC ASME/ANSI (US customary units rather than Imperial) Thread Specifications The final two digits are the number of turns per inch, so the pitch is 0.025".

3

Looks like a square to me - are you sure you selected the pixel checkmark, and also unchecked the "Maintain aspect ratio" box before typing in your second '500'?

3

(Without knowing the model) Short answer is no. In general older cameras (and even some newer ones) tended to use very customised communication protocols and drivers. Also the transition from Windows NT to Windows 7 (let alone Windows 10) changed a lot of things under the hood in the Windows kernel and now the result is that you have a lot of legacy cameras ...

2

A 64 bit processor has a datapath and memory address width of 64 bit. The integer size is also 64 bits. In addition the registers, address bus and data bus is 64 bits wide. Likewise in a 32 bit processor the datapath, memory address width, integer size, register size, etc are 32 bits wide. Also the free online embedded systems course from University of ...

2

Most computers / computing devices will have a real time clock (RTC) built in. This is normally included in the processor or motherboard chip set rather than as a separate part. It will be designed such that when the system is on it uses the main system power to run but when the system is off it has a separate power pin that is connected to a small battery. ...

2

There are a couple of solutions available. You will have to decide a budget and the required accuracy to settle for one. 1) Laser distance sensor - These will give you pretty accurate measurements over a wide range of distances. You can take a look at the product catalog here: https://www.sick.com/us/en/product-portfolio/c/PRODUCT_ROOT 2) Ultrasonic ...

2

I think Bachelor of Technology (B-Tech) is mostly a designation used by Indian Institute of Technology (IIT) and National Institute of Technology (NIT). This write up describes Bachelor of Engineering as knowledge oriented Bachelor of Technology as skill oriented In USA some engineering schools offer two engineering tracks per discipline. The traditional ...

2

The keyboard contains many switches (100 in my keyboard at this moment) and the simplest solution for a keyboard assembly that contains no decoding circuitry would be for each switch to have its own line going to the motherboard, plus one common ground. This is inefficient. The simplest scheme to minimize the burden of all those wires in the interconnect ...

2

Well, I would think that two smaller ones rigged up in an "amateurish" fashion (apologies, but that's we both are, right) are going to be worse than just one (sufficiently large) properly mounted heatsink. That giant triangular piece closest to the CPU would probably delay heat transfer -- even if you have excellent cooling on the other side of it. What I ...

2

A synchronous system with a clock is not necessary. The transition between states can be triggered asynchronously by inputs to the system (e.g. someone pushes a button to operate an automatic door). The finite state machine needs to have some logic elements to "remember" of what state it is currently in, but that does not have to be anything like the ...

2

I order to solve this problem there one needs to understand the following ADC range which is the maximum and minimum ADC input. For this problem the range is 3.2V, -3.2V. ADC resolution which is the smallest distinguishable change in input. For a 12 bit converter this would be 6.4V/4096 = 0.0015625V Below is an example for range of 3.3V based on a 12 bit ...

2

Briefly they take the waveform of the ambient noise then produce the inverse waveform which is then generated. The two waveforms effectively cancel out leaving a much quieter ambient sound level. The important part is to be able to separate the wanted "noise" (music or voices) from the unwanted noise. A search will give you several results that will ...

2

Pretty much every display is multiplexed. Typically each column is turned on (pulled to positive supply, for example) in turn and the rows for the pixels to be turned on in that column are switched to the opposite polarity (pulled to negative supply in this example). Usually the sequence happens at high speed so that there is no noticeable flicker. For very ...

Only top voted, non community-wiki answers of a minimum length are eligible