diagnostic – Dell T3500 light 2 ON all the time meaning & how to fix it?

Looking at the manual for light diagnosis (https://www.dell.com/support/kbdoc/en-uk/000123890/precision-t3500-t5500-t7500-workstations-diagnost…), it says “PCI device configuration activity is in progress or PCI device failure was detected.” I opened and check (volt meter) the PCI cables one by one and it seems all of the give the right amount of voltage.

If I keep the PC unplugged and plug back, then the 2nd light stays ON. I am able to turn ON the Windows. But, after shutting down once, the Windows won’t start (light 1 & 3 blinking a few times) until kept unplugged for sometime. I ran the system diagnostic (BIOS) and it didn’t find any issues! I have also checked the battery, drained the power by holding the power button.

Once, it gave me the message that the “previous processor thermal failure” & “system battery voltage is low”. This message only appears once.

Strange, if the processor is failed why it turns ON sometimes. The battery is replaced, so why low.

operating systems – What is exact meaning if job queue , How about this?

Is it Okay to understand job queue like this??

I have a hard time understanding the concept of job queue
For example, when user click the icons of exe file, the newly created process is passed to job queue, and long term scheduler decides when to allocate memory to this newly created process, depend on CPU limit or RAM limit, and if it is okay to allocate memory to newly created process, job scheduler takes that memory and put it to ready queue after memory allocating. Isit right??? 

intuition – What intuitive meaning “determinant” of a divergency (divergent integral or series) can have?

I am working on the algebra of “divergencies”, that is, infinite integrals, series and germs.
So, I decided to construct something similar to determinant of a matrix of these entities.

$$det w=exp(operatorname{reg }ln w)$$
which is analogous to how determinant of a matrix can be expressed, except we take finite part (regularize) instead of taking trace.

Like determinant of a matrix, determinant of a divergency can be negative. It does not follow the requirements for a norm (Pythagorean theorem), and is not even continuous. Still, it has some usual properties, like $$1/det w=det 1/w$$.

Below is a table of some divergencies with their finite parts and determinants.

An interesting property is that the constant $e^{-gamma}$ often appears in the expressions for these determinants.

I wonder, what intuitively can indicate such determinant of a divirgent integral or series? Can it tell something about its properties?

text{Delta form} & text{In terms of } tau, omega_+,omega_- & text{Finite part} & text{Integral or series form} & text{Germ form} &text{Determinant}\
pi delta (0) & tau & 0 & int_0^{infty } , dx;int_0^{infty } frac{1}{x^2} , dx & underset{xtoinfty}{operatorname{germ}} x;underset{xto0^+}{operatorname{germ}}frac1x&frac{e^{-gamma}}4 \
pi delta (0)-frac{1}{2} & omega _-;tau-frac{1}{2} & -frac{1}{2} & sum _{k=1}^{infty } 1 & underset{xtoinfty}{operatorname{germ}} (x-1/2) &e^{-gamma} \
pi delta (0)+frac{1}{2} & omega _+;tau+frac{1}{2} & frac{1}{2} &sum _{k=0}^{infty } 1 & underset{xtoinfty}{operatorname{germ}} (x+1/2) & e^{-gamma} \
2 pi delta (i) & e^{omega_+}-e^{omega_-}-1 & 0 & int_{-infty }^{infty } e^x , dx & underset{xtoinfty}{operatorname{germ}} e^x \
& frac{tau ^2}{2}+frac{1}{24};frac{omega_+^3-omega_-^3}6 & 0 & int_0^{infty} x , dx;int_0^infty frac2{x^3}dx & underset{xtoinfty}{operatorname{germ}}frac{x^2}2;underset{xto0^+}{operatorname{germ}} frac1{x^2}\
& frac{tau ^2}{2}-frac{1}{24} & -frac1{12} & sum _{k=0}^{infty } k & underset{xtoinfty}{operatorname{germ}} left(frac{x^2}2-frac1{12}right) \
-pi delta”(0) &frac {tau^3}3 +fractau{12};frac{omega_+^4-omega_-^4}{12}& 0 & int_0^infty x^2dx;int_0^inftyfrac6{x^4}dx&underset{xtoinfty}{operatorname{germ}}frac{x^3}3;underset{xto0^+}{operatorname{germ}} frac2{x^3}\
pi^2delta(0)^2-pidelta(0)+1/4&omega_-^2&frac16&2 int_0^{infty } left(x-frac{1}{2}right) , dx+frac{1}{6}&underset{xtoinfty}{operatorname{germ}}B_2(x)&e^{-2gamma}\
pi^2delta(0)^2+pidelta(0)+1/4&omega_+^2&frac16&2 int_0^{infty } left(x+frac{1}{2}right) , dx+frac{1}{6}&underset{xtoinfty}{operatorname{germ}}B_2(x+1)&e^{-2gamma}\
pi^2delta(0)^2&tau^2&-frac1{12}&int_{-infty}^{infty } |x| , dx-frac{1}{12}&underset{xtoinfty}{operatorname{germ}}B_2(x+1/2)&frac{e^{-2gamma}}{16} \
&ln omega_++gamma&0&int_1^infty frac{dx}x;sum_{k=1}^infty frac1x -gamma&underset{xtoinfty}{operatorname{germ}}ln x\
-3pidelta”(0)-frac14 pidelta(0);pi^3delta(0)^3&tau^3&0&int_0^infty left(3x^2-frac1{4}right)dx&underset{xtoinfty}{operatorname{germ}}B_3(x+1/2)&frac{e^{-3gamma}}{64} \
frac{2pidelta(i)+1}{e-1}&e^{omega_-}&frac1{e-1}&frac1{e-1}+frac1{e-1}int_{-infty}^infty e^x dx&underset{xtoinfty}{operatorname{germ}} frac{e^x+1}{e-1}&frac1{sqrt{e}}\
frac{2pidelta(i)+1}{1-e^{-1}}&e^{omega_+}&frac1{1-e^{-1}}&frac1{1-e^{-1}}+frac1{1-e^{-1}}int_{-infty}^infty e^x dx&underset{xtoinfty}{operatorname{germ}} frac{e^x+1}{1-e^{-1}}&sqrt{e}\

NL Refuse Stamp meaning and effect? What I can do to remove it?

Iam colombian citizen without EU residence. My boyfriend is German citizen and we were travelling from Tanzania to Amsterdam. I had already 90 free to stay in the schengenaera with out visa. When we were arriving at the schipol border ask us the officer if have a proof for our long term relationship more then 6 months. We just had more then 1000 pictures with dates but after 3h waiting he said it’s for him not enough as a proof. He means we need to show a offical bank account or a contract from our flat what we didn’t have. The gouverment change the rules 5 days before our arrival that pictures are not a proof anymore. After 2h discussion he allowed us to stay a nightin the airport transit zone and take a flight to Croatia at the next day. When he gave me my passport back I saw in the plane that stamp? What does it means ? And what consequence I have to care? Can I enter in the Schengen aera? I cought just the wrong person on the wrong day I had enough money with me for hole my stay. I have family in Spain what I wanted to visit the flight was at the next day I just wanted to enter to sleep in a hotel. Becarefully guys with the schipol airport Amsterdam with third country passes! enter image description here

multivariable calculus – Question about meaning of derivative of vector-valued function

So I was wondering about the interpretation of the derivative of a vector-valued function in the sense of how it is analogous to a function with one variable input and one output. With the derivative in single variable calculus, it is interpreted as the slope of the line that is tangent to the curve.

With a vector valued function, when we take the derivative, it is equivalent to taking the derivative of each of the components of the function’s output. So are we saying that instead of a representing a line that is tangent to the curve, it is representing a vector that is tangent to the curve?

But what is confusing me about the analogy is this. In the single variable situation, we can travel along the tangent line that is given by the derivative. What is the meaning of “travelling along the tangent line” when we have a tangent vector? Do we travel along the tangent vector?

zoom – Magnification percentage meaning

100% = “actual pixels”. A pixel on your monitor equals a pixel from your camera. OK, not exactly, if your computer display scaling is not 100%, then there is another complication, but that can be ignored for this calculation.

You need to start with the magnification that fills your screen window. Multiply your focal length by the ratio of the percentages. If you shot at 30mm, and 10% fills your window; then at 100% this will be the equivalent of 30mm * (100%/10%) = 300mm.

This is an approximation that works for normal lenses. For an ultrawide, it won’t be nearly as accurate. There may be a lens geek here that knows how to convert for any lens focal length.

terminology – What is the meaning of fan-out

Indeed that Wikipedia definition misses the point.

Think in terms of a data flow diagram. Each processing node can have its output wired to 0 or more downstream nodes. In a visual diagram, those output wires look like a hand-held paper fan. Those wires or number of wires is its fan-out.

enter image description here

A node’s input can be wired to multiple sources. That’s its fan-in.

The term comes from electrical engineering of logic gates.

gui design – Best practice for meaning of “return” in UI flow

For context in this question, I am recalling a programmable thermostat interface with four large buttons, two each on the left and right side of an LCD display. The display showed labels for the buttons, which changed depending on the mode. At a particular place in the “programming” sequence, the center of the screen had a flashing “Monday / Leave / 19C ” with “10:30” not flashing and the labels next to each button were: “Return” (upper left), “Save” (upper right), “-” (lower left) and “+” (lower right).

Does that upper left label mean “return” as in the common sense of “go back to where you were before / the previous step?” Or does it carry the programming sense of the word, “take this value back and continue to the next step?” On many keyboards, it seems the “return” key (also sometimes called Enter) is closer to the latter meaning. In this particular context, it could also mean “Instead of programming the ‘leave’ temperature, switch to programming what the temperature when the occupant returns/comes back into the space, when the temperature setting should return to what is desired for when the space is occupied.”

From this interface, it seems that pushing the + and – buttons would adjust the time set temperature but it’s not clear exactly what the meaning of “return” should be in UIs. In the particular instance motivating the question, the user had a very young child who had pressed some of the buttons on a thermostat the user did not have permission to program. The user wished to cancel out all recent changes and return to the previous state, without having personal memory of what all that state was, and the interface did not appear at all clear about how to accomplish that, if it was even possible.

Are there any standards or best practices published on this?