10

For the explanation of the loss of stress from E to F, I'll refer you to my answer to another question. Basically, the drop in stress seen in the diagram is a consequence of the fact that we use engineering stress (not taking the loss of cross-sectional area into consideration) instead of true stress. In a true stress diagram, there is no such drop. See this ...


7

To add to the other answers: interstitial solutes effectively "lock" dislocations in BCC metals (such as with carbon and nitrogen dissolved in iron), by forming what are called Cottrell atmospheres (Wikipedia). The lowest free energy is achieved when the interstitial atoms are in the dislocation, because the dislocation has a larger interatomic spacing due ...


6

Some of this depends on how tough the dishes are. While taking a lot of room, I can see possibilitiles in a conveyer sorter. Concept one: Dishes are dumped onto a conveyer that is on a sideways slant. Operator initially only has to see that they are one layer deep. Use of multiple belts runing side by side at different speeds and textures may be able to ...


5

What is Fair? Your definition of fairness is the quantity that you are really trying to optimize (maximize). There can be multiple methods to optimize for this, but first you have to define how this will be calculated. I am going to describe some possible methods below. Maximize Number of Full Orders This method assumes that the happiness of each ...


4

The way of removing couplings in the worst case scenario, where all other alternatives has failed, is to physically destroy the coupling. Cut/grind 2 slots the entire length of the coupling on opposite sides, usually one on top and one on the bottom. The slots need to be deep enough that it is at least flush with the pipe its screwed onto, pretty much as ...


4

Structurally the pressure is independent from the nature of the gas. So, it shouldn't matter if its $N_2$ or $O_2$. Special care should be taken with corrosive gases, but usually that means the containers need to be manufactured with corrosion resistant materials. Regarding $H_2$ my main concern would be if it leaks out. Hydrogen is the lightest known gas. ...


3

There are several pages about building kids trailer: New EU Standard EN 15918:2011 for Bicycle Trailers Bicycle trailer There is mentioned EU standard: A voluntary European standard (EN 15918) for two-wheel bicycle trailers was published in September 2011. This standard applies to trailers carrying cargo and/or up to 2 passengers, and enforces a ...


3

If you are using RTV silicone of the type used for prosthetics and animatronics then you can get a variety of grades with different mechanical properties, commonly rated by Shore Hardness. You can also get additives known as 'deadeners' which create a more matte surface and reduce the slippery feel. To create swirl colours you want to make up 2 or more ...


3

These threads are rolled. The blank is automatically fed to sit around a central wheel which has the form of the thread. An external arm with the opposing half of the form then lowers to apply pressure and form the threads, before being automatically ejected from the central wheel, ready for the next part. This video https://www.youtube.com/watch?v=...


3

If we talk about quality and 6-sigma (which roughly means 1 ppm defects), the 1 ppm refers to test escapes, not test rejects. Even if a part only costs \$1, if testing fails to catch a bad part and we accidentally send it to a customer, where it fails in the field, the eventual cost (in failure analysis, corrective actions, documentation, time spent ...


2

First, do away with "one for everyone" as the primary ones will be left with empty stock and the marginal ones with unsold ones. Distribute according to your "Same Percentage of All of the Orders" method, rounding it down; assigning maybe 95% of the number you'd be able to assign. Then dispatch the remaining units to stores that issue individual requests, ...


2

This report from Rice University covers design and economics of synthesis gas reformers. Reaction 1: $CH_4+H_2O<->CO+3H_2$ (Steam reforming) Reaction 2: $CO+H_2O<->CO_2+H_2$ (Water gas shift) Reaction 3: $CH_4+3/2O_2<->2H_2O+CO$ (Combustion) Reactions 1 & 2 are endothermic and occur in the primary reformer. Reaction 3, the ...


2

In most organizations, how you refer to a test in the report depends on the purpose of the test and in turn that will be reflected in the established document naming system. For example if the purpose of your test is validation, the report template would be named something like Validation Report - (Project XYZ) or something like that. Typically all of this ...


2

Further adding to Wasabi answer, The yield point phenomenon occurs due to the segregation of impurity solute atoms(C and/ or N in Fe) around dislocations so as to reduce the strain energy associated with the distorted atomic arrangement (maximum in bcc metals, less in hcp metals and least in fcc metals). This additional stress required to free the ...


2

I don't know of any mathematical or statistical techniques that would help you analyse machine utlization data. From the additional information you've given in the comments, my understanding is that your aim is the minimize the cost of keeping spare parts for the machines based on machine usage. The critical factor is going to be the duration of usage for ...


2

So, look at the time history that you added in edit 3. Notice how it is never ever ever below 1. That's very telling. Let us assume that you have a MEMS accelerometer is able to read down to 0 Hertz. So in the vertical direction, we expect to see 1g due to gravity PLUS the vibration. In other words, we expect to see $y(t) = 1 + A cos(\omega t)$, where A ...


2

If you have a rubber that you believe has the best coefficient of friction possible then it wont matter too much how it is shaped unless you need to deal with water or mud like a car tire. The best way to increase the force of friction is to add weight. As you probably know the friction equation is $F=\mu N$ $(F=$Friction Force, $\mu=$friction coefficient, $...


2

Full Analysis Perfectly Insulated System The best case is to analyze this system in both the time and position domains. The time domain considers the variation of the reactor temperature $T_r(t)$ and the outlet temperature of the jacket system $T_{jL}(t)$. The position domain considers the variation of the temperature profile through the jacket $T_{j}(z)$. ...


2

On the BBC in London, in the 1980s, if a BBC radio station had to report on a live sports fixture, and it was not a live broadcast of the whole game, just a half-time report, or full-time report, the reporters usually phoned the London studio from a public pay-phone (land-line) and were switched live into the on-air feed. For a soccer match, broadcast with a ...


1

To measure an airflow you can measure the pressure drop across a section or before and after a bend. That pressure difference can then be calculated into the flow rate.


1

From skimming a (sadly german language) "blower bible", it seems that high pressure radial blowers are mostly used in the pressure range you need. Axial blowers appear to deliver a too low pressure, a compressor is certainly overblown for just 40mbar. However, I would suggest that due to your high volume flows you experience significant pressure losses and ...


1

Copper is notoriouos for hardening and breaking under bending or hammering it, or working it any other way. To keep it soft and flexible, you have to anneal it often while working on it. It also bends easier and breaks less soon when you bend it while it's hot. You can heat it with the torch, but you're right about exploding it, getting it too hot may get ...


1

I am pretty sure most dosing/metering pump manufacturers provide some degree of what you are asking for. I know that we have used Prominent before and they make metering pumps that can be controlled with a 4-20 mA signal, as do several other manufacturers (I think I have seen some from Grundfos also). Prominent also sells controllers that you can integrate ...


1

The plant I used to work at had a Supervisory Control And Data Acquisition (SCADA). They had all kinds of transducers measuring everything in sight and we could sit in the control room and check on things all over the plant. (warstory) One night (when I should have been working) I was poking around and noticed the temperature of the Feedwater pump A ...


1

SysML is a good choice when it comes to modeling use cases and understanding systematic approach (business modeling), in a generic industrial context. SQL is used to mine business data. R is great for analysis and simulation. VBA has good portability when coupled with Excel. PDM software is good for setting up a document control process. Checking files ...


1

Such a pressure vessel is not technically achievable with current technology. See this question. There are two main methods of making synthetic diamonds. HPHT (High pressure, high temperature), which uses something like a Diamond Anvil Cell to achieve pressures in the Gigapascal range and temperatures over 1400 $^o$C. The largest diamonds produced this way ...


1

I would suggest that sports science is probably a good place to look for this sort of information as reaction times are critical in many sports, for example the reaction times of sprinters to the starting gun are often quoted. For very simple operations like a button press then the time taken for the brain to process the stimulus, make a decision and react ...


1

The problem comes down to pressure. If your supply building (building 1), which has capacity, is far enough away, the pressure at the end of that line may be significantly lower than the line in new building, (building 2), especially before the filters. If this is the case, the new line won't have enough force to open the check valve against the old line, ...


1

If you know that the check valve won't contribute too much frictional loss and that mixing the air from building 2 (higher quality air building) with air in building 1 (supply building) cannot happen, a check valve will be fine. The only other consideration I would have is to give a way to vent the air in building 2 because if there is some air stuck between ...


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